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6f086dfc | 1 | /* Expands front end tree to back end RTL for GNU C-Compiler |
a5cad800 | 2 | Copyright (C) 1987, 88, 89, 91-98, 1999 Free Software Foundation, Inc. |
6f086dfc RS |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
a35311b0 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
6f086dfc RS |
20 | |
21 | ||
22 | /* This file handles the generation of rtl code from tree structure | |
23 | at the level of the function as a whole. | |
24 | It creates the rtl expressions for parameters and auto variables | |
25 | and has full responsibility for allocating stack slots. | |
26 | ||
27 | `expand_function_start' is called at the beginning of a function, | |
28 | before the function body is parsed, and `expand_function_end' is | |
29 | called after parsing the body. | |
30 | ||
31 | Call `assign_stack_local' to allocate a stack slot for a local variable. | |
32 | This is usually done during the RTL generation for the function body, | |
33 | but it can also be done in the reload pass when a pseudo-register does | |
34 | not get a hard register. | |
35 | ||
36 | Call `put_var_into_stack' when you learn, belatedly, that a variable | |
37 | previously given a pseudo-register must in fact go in the stack. | |
38 | This function changes the DECL_RTL to be a stack slot instead of a reg | |
39 | then scans all the RTL instructions so far generated to correct them. */ | |
40 | ||
41 | #include "config.h" | |
670ee920 | 42 | #include "system.h" |
6f086dfc RS |
43 | #include "rtl.h" |
44 | #include "tree.h" | |
45 | #include "flags.h" | |
1ef08c63 | 46 | #include "except.h" |
6f086dfc RS |
47 | #include "function.h" |
48 | #include "insn-flags.h" | |
49 | #include "expr.h" | |
50 | #include "insn-codes.h" | |
51 | #include "regs.h" | |
52 | #include "hard-reg-set.h" | |
53 | #include "insn-config.h" | |
54 | #include "recog.h" | |
55 | #include "output.h" | |
bdac5f58 | 56 | #include "basic-block.h" |
c20bf1f3 | 57 | #include "obstack.h" |
10f0ad3d | 58 | #include "toplev.h" |
fe9b4957 | 59 | #include "hash.h" |
6f086dfc | 60 | |
189cc377 RK |
61 | #ifndef TRAMPOLINE_ALIGNMENT |
62 | #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY | |
63 | #endif | |
64 | ||
d16790f2 JW |
65 | #ifndef LOCAL_ALIGNMENT |
66 | #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT | |
67 | #endif | |
68 | ||
293e3de4 RS |
69 | /* Some systems use __main in a way incompatible with its use in gcc, in these |
70 | cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to | |
71 | give the same symbol without quotes for an alternative entry point. You | |
0f41302f | 72 | must define both, or neither. */ |
293e3de4 RS |
73 | #ifndef NAME__MAIN |
74 | #define NAME__MAIN "__main" | |
75 | #define SYMBOL__MAIN __main | |
76 | #endif | |
77 | ||
6f086dfc RS |
78 | /* Round a value to the lowest integer less than it that is a multiple of |
79 | the required alignment. Avoid using division in case the value is | |
80 | negative. Assume the alignment is a power of two. */ | |
81 | #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1)) | |
82 | ||
83 | /* Similar, but round to the next highest integer that meets the | |
84 | alignment. */ | |
85 | #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1)) | |
86 | ||
87 | /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp | |
88 | during rtl generation. If they are different register numbers, this is | |
89 | always true. It may also be true if | |
90 | FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl | |
91 | generation. See fix_lexical_addr for details. */ | |
92 | ||
93 | #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
94 | #define NEED_SEPARATE_AP | |
95 | #endif | |
96 | ||
97 | /* Number of bytes of args popped by function being compiled on its return. | |
98 | Zero if no bytes are to be popped. | |
99 | May affect compilation of return insn or of function epilogue. */ | |
100 | ||
101 | int current_function_pops_args; | |
102 | ||
103 | /* Nonzero if function being compiled needs to be given an address | |
104 | where the value should be stored. */ | |
105 | ||
106 | int current_function_returns_struct; | |
107 | ||
108 | /* Nonzero if function being compiled needs to | |
109 | return the address of where it has put a structure value. */ | |
110 | ||
111 | int current_function_returns_pcc_struct; | |
112 | ||
113 | /* Nonzero if function being compiled needs to be passed a static chain. */ | |
114 | ||
115 | int current_function_needs_context; | |
116 | ||
117 | /* Nonzero if function being compiled can call setjmp. */ | |
118 | ||
119 | int current_function_calls_setjmp; | |
120 | ||
121 | /* Nonzero if function being compiled can call longjmp. */ | |
122 | ||
123 | int current_function_calls_longjmp; | |
124 | ||
125 | /* Nonzero if function being compiled receives nonlocal gotos | |
126 | from nested functions. */ | |
127 | ||
128 | int current_function_has_nonlocal_label; | |
129 | ||
8634413a JW |
130 | /* Nonzero if function being compiled has nonlocal gotos to parent |
131 | function. */ | |
132 | ||
133 | int current_function_has_nonlocal_goto; | |
134 | ||
6f086dfc RS |
135 | /* Nonzero if function being compiled contains nested functions. */ |
136 | ||
137 | int current_function_contains_functions; | |
138 | ||
54ff41b7 JW |
139 | /* Nonzero if function being compiled doesn't contain any calls |
140 | (ignoring the prologue and epilogue). This is set prior to | |
141 | local register allocation and is valid for the remaining | |
142 | compiler passes. */ | |
143 | ||
144 | int current_function_is_leaf; | |
145 | ||
fdb8a883 JW |
146 | /* Nonzero if function being compiled doesn't modify the stack pointer |
147 | (ignoring the prologue and epilogue). This is only valid after | |
148 | life_analysis has run. */ | |
149 | ||
150 | int current_function_sp_is_unchanging; | |
151 | ||
54ff41b7 JW |
152 | /* Nonzero if the function being compiled is a leaf function which only |
153 | uses leaf registers. This is valid after reload (specifically after | |
154 | sched2) and is useful only if the port defines LEAF_REGISTERS. */ | |
155 | ||
156 | int current_function_uses_only_leaf_regs; | |
157 | ||
acd693d1 | 158 | /* Nonzero if the function being compiled issues a computed jump. */ |
ab87f8c8 | 159 | |
acd693d1 | 160 | int current_function_has_computed_jump; |
ab87f8c8 | 161 | |
173cd503 JM |
162 | /* Nonzero if the current function is a thunk (a lightweight function that |
163 | just adjusts one of its arguments and forwards to another function), so | |
164 | we should try to cut corners where we can. */ | |
165 | int current_function_is_thunk; | |
166 | ||
6f086dfc RS |
167 | /* Nonzero if function being compiled can call alloca, |
168 | either as a subroutine or builtin. */ | |
169 | ||
170 | int current_function_calls_alloca; | |
171 | ||
172 | /* Nonzero if the current function returns a pointer type */ | |
173 | ||
174 | int current_function_returns_pointer; | |
175 | ||
176 | /* If some insns can be deferred to the delay slots of the epilogue, the | |
177 | delay list for them is recorded here. */ | |
178 | ||
179 | rtx current_function_epilogue_delay_list; | |
180 | ||
181 | /* If function's args have a fixed size, this is that size, in bytes. | |
182 | Otherwise, it is -1. | |
183 | May affect compilation of return insn or of function epilogue. */ | |
184 | ||
185 | int current_function_args_size; | |
186 | ||
187 | /* # bytes the prologue should push and pretend that the caller pushed them. | |
188 | The prologue must do this, but only if parms can be passed in registers. */ | |
189 | ||
190 | int current_function_pretend_args_size; | |
191 | ||
f7339633 | 192 | /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is |
0f41302f | 193 | defined, the needed space is pushed by the prologue. */ |
6f086dfc RS |
194 | |
195 | int current_function_outgoing_args_size; | |
196 | ||
197 | /* This is the offset from the arg pointer to the place where the first | |
198 | anonymous arg can be found, if there is one. */ | |
199 | ||
200 | rtx current_function_arg_offset_rtx; | |
201 | ||
202 | /* Nonzero if current function uses varargs.h or equivalent. | |
203 | Zero for functions that use stdarg.h. */ | |
204 | ||
205 | int current_function_varargs; | |
206 | ||
ebb904cb RK |
207 | /* Nonzero if current function uses stdarg.h or equivalent. |
208 | Zero for functions that use varargs.h. */ | |
209 | ||
210 | int current_function_stdarg; | |
211 | ||
6f086dfc RS |
212 | /* Quantities of various kinds of registers |
213 | used for the current function's args. */ | |
214 | ||
215 | CUMULATIVE_ARGS current_function_args_info; | |
216 | ||
217 | /* Name of function now being compiled. */ | |
218 | ||
219 | char *current_function_name; | |
220 | ||
f345de42 JL |
221 | /* If non-zero, an RTL expression for the location at which the current |
222 | function returns its result. If the current function returns its | |
223 | result in a register, current_function_return_rtx will always be | |
224 | the hard register containing the result. */ | |
6f086dfc RS |
225 | |
226 | rtx current_function_return_rtx; | |
227 | ||
228 | /* Nonzero if the current function uses the constant pool. */ | |
229 | ||
230 | int current_function_uses_const_pool; | |
231 | ||
232 | /* Nonzero if the current function uses pic_offset_table_rtx. */ | |
233 | int current_function_uses_pic_offset_table; | |
234 | ||
235 | /* The arg pointer hard register, or the pseudo into which it was copied. */ | |
236 | rtx current_function_internal_arg_pointer; | |
237 | ||
aeb302bb JM |
238 | /* Language-specific reason why the current function cannot be made inline. */ |
239 | char *current_function_cannot_inline; | |
240 | ||
07417085 KR |
241 | /* Nonzero if instrumentation calls for function entry and exit should be |
242 | generated. */ | |
243 | int current_function_instrument_entry_exit; | |
244 | ||
7d384cc0 KR |
245 | /* Nonzero if memory access checking be enabled in the current function. */ |
246 | int current_function_check_memory_usage; | |
247 | ||
6f086dfc RS |
248 | /* The FUNCTION_DECL for an inline function currently being expanded. */ |
249 | tree inline_function_decl; | |
250 | ||
251 | /* Number of function calls seen so far in current function. */ | |
252 | ||
253 | int function_call_count; | |
254 | ||
255 | /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels | |
256 | (labels to which there can be nonlocal gotos from nested functions) | |
257 | in this function. */ | |
258 | ||
259 | tree nonlocal_labels; | |
260 | ||
ba716ac9 BS |
261 | /* List (chain of EXPR_LIST) of stack slots that hold the current handlers |
262 | for nonlocal gotos. There is one for every nonlocal label in the function; | |
263 | this list matches the one in nonlocal_labels. | |
6f086dfc RS |
264 | Zero when function does not have nonlocal labels. */ |
265 | ||
ba716ac9 | 266 | rtx nonlocal_goto_handler_slots; |
6f086dfc | 267 | |
e881bb1b RH |
268 | /* List (chain of EXPR_LIST) of labels heading the current handlers for |
269 | nonlocal gotos. */ | |
270 | ||
271 | rtx nonlocal_goto_handler_labels; | |
272 | ||
6f086dfc RS |
273 | /* RTX for stack slot that holds the stack pointer value to restore |
274 | for a nonlocal goto. | |
275 | Zero when function does not have nonlocal labels. */ | |
276 | ||
277 | rtx nonlocal_goto_stack_level; | |
278 | ||
279 | /* Label that will go on parm cleanup code, if any. | |
280 | Jumping to this label runs cleanup code for parameters, if | |
281 | such code must be run. Following this code is the logical return label. */ | |
282 | ||
283 | rtx cleanup_label; | |
284 | ||
285 | /* Label that will go on function epilogue. | |
286 | Jumping to this label serves as a "return" instruction | |
287 | on machines which require execution of the epilogue on all returns. */ | |
288 | ||
289 | rtx return_label; | |
290 | ||
291 | /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs. | |
292 | So we can mark them all live at the end of the function, if nonopt. */ | |
293 | rtx save_expr_regs; | |
294 | ||
295 | /* List (chain of EXPR_LISTs) of all stack slots in this function. | |
296 | Made for the sake of unshare_all_rtl. */ | |
297 | rtx stack_slot_list; | |
298 | ||
299 | /* Chain of all RTL_EXPRs that have insns in them. */ | |
300 | tree rtl_expr_chain; | |
301 | ||
302 | /* Label to jump back to for tail recursion, or 0 if we have | |
303 | not yet needed one for this function. */ | |
304 | rtx tail_recursion_label; | |
305 | ||
306 | /* Place after which to insert the tail_recursion_label if we need one. */ | |
307 | rtx tail_recursion_reentry; | |
308 | ||
309 | /* Location at which to save the argument pointer if it will need to be | |
310 | referenced. There are two cases where this is done: if nonlocal gotos | |
311 | exist, or if vars stored at an offset from the argument pointer will be | |
312 | needed by inner routines. */ | |
313 | ||
314 | rtx arg_pointer_save_area; | |
315 | ||
316 | /* Offset to end of allocated area of stack frame. | |
317 | If stack grows down, this is the address of the last stack slot allocated. | |
318 | If stack grows up, this is the address for the next slot. */ | |
8af5168b | 319 | HOST_WIDE_INT frame_offset; |
6f086dfc RS |
320 | |
321 | /* List (chain of TREE_LISTs) of static chains for containing functions. | |
322 | Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx | |
323 | in an RTL_EXPR in the TREE_VALUE. */ | |
324 | static tree context_display; | |
325 | ||
326 | /* List (chain of TREE_LISTs) of trampolines for nested functions. | |
327 | The trampoline sets up the static chain and jumps to the function. | |
328 | We supply the trampoline's address when the function's address is requested. | |
329 | ||
330 | Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx | |
331 | in an RTL_EXPR in the TREE_VALUE. */ | |
332 | static tree trampoline_list; | |
333 | ||
334 | /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */ | |
335 | static rtx parm_birth_insn; | |
336 | ||
337 | #if 0 | |
338 | /* Nonzero if a stack slot has been generated whose address is not | |
339 | actually valid. It means that the generated rtl must all be scanned | |
340 | to detect and correct the invalid addresses where they occur. */ | |
341 | static int invalid_stack_slot; | |
342 | #endif | |
343 | ||
344 | /* Last insn of those whose job was to put parms into their nominal homes. */ | |
345 | static rtx last_parm_insn; | |
346 | ||
e9a25f70 JL |
347 | /* 1 + last pseudo register number possibly used for loading a copy |
348 | of a parameter of this function. */ | |
349 | int max_parm_reg; | |
6f086dfc RS |
350 | |
351 | /* Vector indexed by REGNO, containing location on stack in which | |
352 | to put the parm which is nominally in pseudo register REGNO, | |
e9a25f70 JL |
353 | if we discover that that parm must go in the stack. The highest |
354 | element in this vector is one less than MAX_PARM_REG, above. */ | |
355 | rtx *parm_reg_stack_loc; | |
6f086dfc | 356 | |
6f086dfc RS |
357 | /* Nonzero once virtual register instantiation has been done. |
358 | assign_stack_local uses frame_pointer_rtx when this is nonzero. */ | |
359 | static int virtuals_instantiated; | |
360 | ||
46766466 RS |
361 | /* These variables hold pointers to functions to |
362 | save and restore machine-specific data, | |
363 | in push_function_context and pop_function_context. */ | |
9e014ded RK |
364 | void (*save_machine_status) PROTO((struct function *)); |
365 | void (*restore_machine_status) PROTO((struct function *)); | |
46766466 | 366 | |
6f086dfc RS |
367 | /* Nonzero if we need to distinguish between the return value of this function |
368 | and the return value of a function called by this function. This helps | |
369 | integrate.c */ | |
370 | ||
371 | extern int rtx_equal_function_value_matters; | |
e7a84011 | 372 | extern tree sequence_rtl_expr; |
6f086dfc RS |
373 | \f |
374 | /* In order to evaluate some expressions, such as function calls returning | |
375 | structures in memory, we need to temporarily allocate stack locations. | |
376 | We record each allocated temporary in the following structure. | |
377 | ||
378 | Associated with each temporary slot is a nesting level. When we pop up | |
379 | one level, all temporaries associated with the previous level are freed. | |
380 | Normally, all temporaries are freed after the execution of the statement | |
381 | in which they were created. However, if we are inside a ({...}) grouping, | |
382 | the result may be in a temporary and hence must be preserved. If the | |
383 | result could be in a temporary, we preserve it if we can determine which | |
384 | one it is in. If we cannot determine which temporary may contain the | |
385 | result, all temporaries are preserved. A temporary is preserved by | |
386 | pretending it was allocated at the previous nesting level. | |
387 | ||
388 | Automatic variables are also assigned temporary slots, at the nesting | |
389 | level where they are defined. They are marked a "kept" so that | |
390 | free_temp_slots will not free them. */ | |
391 | ||
392 | struct temp_slot | |
393 | { | |
394 | /* Points to next temporary slot. */ | |
395 | struct temp_slot *next; | |
0f41302f | 396 | /* The rtx to used to reference the slot. */ |
6f086dfc | 397 | rtx slot; |
e5e76139 RK |
398 | /* The rtx used to represent the address if not the address of the |
399 | slot above. May be an EXPR_LIST if multiple addresses exist. */ | |
400 | rtx address; | |
d16790f2 JW |
401 | /* The alignment (in bits) of the slot. */ |
402 | int align; | |
6f086dfc | 403 | /* The size, in units, of the slot. */ |
e5e809f4 | 404 | HOST_WIDE_INT size; |
a4c6502a MM |
405 | /* The alias set for the slot. If the alias set is zero, we don't |
406 | know anything about the alias set of the slot. We must only | |
407 | reuse a slot if it is assigned an object of the same alias set. | |
408 | Otherwise, the rest of the compiler may assume that the new use | |
409 | of the slot cannot alias the old use of the slot, which is | |
410 | false. If the slot has alias set zero, then we can't reuse the | |
411 | slot at all, since we have no idea what alias set may have been | |
412 | imposed on the memory. For example, if the stack slot is the | |
413 | call frame for an inline functioned, we have no idea what alias | |
414 | sets will be assigned to various pieces of the call frame. */ | |
415 | int alias_set; | |
e7a84011 RK |
416 | /* The value of `sequence_rtl_expr' when this temporary is allocated. */ |
417 | tree rtl_expr; | |
6f086dfc RS |
418 | /* Non-zero if this temporary is currently in use. */ |
419 | char in_use; | |
a25d4ba2 RK |
420 | /* Non-zero if this temporary has its address taken. */ |
421 | char addr_taken; | |
6f086dfc RS |
422 | /* Nesting level at which this slot is being used. */ |
423 | int level; | |
424 | /* Non-zero if this should survive a call to free_temp_slots. */ | |
425 | int keep; | |
fc91b0d0 RK |
426 | /* The offset of the slot from the frame_pointer, including extra space |
427 | for alignment. This info is for combine_temp_slots. */ | |
e5e809f4 | 428 | HOST_WIDE_INT base_offset; |
fc91b0d0 RK |
429 | /* The size of the slot, including extra space for alignment. This |
430 | info is for combine_temp_slots. */ | |
e5e809f4 | 431 | HOST_WIDE_INT full_size; |
6f086dfc RS |
432 | }; |
433 | ||
434 | /* List of all temporaries allocated, both available and in use. */ | |
435 | ||
436 | struct temp_slot *temp_slots; | |
437 | ||
438 | /* Current nesting level for temporaries. */ | |
439 | ||
440 | int temp_slot_level; | |
e5e809f4 JL |
441 | |
442 | /* Current nesting level for variables in a block. */ | |
443 | ||
444 | int var_temp_slot_level; | |
f5963e61 JL |
445 | |
446 | /* When temporaries are created by TARGET_EXPRs, they are created at | |
447 | this level of temp_slot_level, so that they can remain allocated | |
448 | until no longer needed. CLEANUP_POINT_EXPRs define the lifetime | |
449 | of TARGET_EXPRs. */ | |
450 | int target_temp_slot_level; | |
6f086dfc | 451 | \f |
e15679f8 RK |
452 | /* This structure is used to record MEMs or pseudos used to replace VAR, any |
453 | SUBREGs of VAR, and any MEMs containing VAR as an address. We need to | |
454 | maintain this list in case two operands of an insn were required to match; | |
455 | in that case we must ensure we use the same replacement. */ | |
456 | ||
457 | struct fixup_replacement | |
458 | { | |
459 | rtx old; | |
460 | rtx new; | |
461 | struct fixup_replacement *next; | |
462 | }; | |
463 | ||
fe9b4957 MM |
464 | struct insns_for_mem_entry { |
465 | /* The KEY in HE will be a MEM. */ | |
466 | struct hash_entry he; | |
467 | /* These are the INSNS which reference the MEM. */ | |
468 | rtx insns; | |
469 | }; | |
470 | ||
e15679f8 RK |
471 | /* Forward declarations. */ |
472 | ||
1ac4f799 JL |
473 | static rtx assign_outer_stack_local PROTO ((enum machine_mode, HOST_WIDE_INT, |
474 | int, struct function *)); | |
d16790f2 JW |
475 | static rtx assign_stack_temp_for_type PROTO ((enum machine_mode, HOST_WIDE_INT, |
476 | int, tree)); | |
e15679f8 RK |
477 | static struct temp_slot *find_temp_slot_from_address PROTO((rtx)); |
478 | static void put_reg_into_stack PROTO((struct function *, rtx, tree, | |
0006e95b | 479 | enum machine_mode, enum machine_mode, |
fe9b4957 MM |
480 | int, int, int, |
481 | struct hash_table *)); | |
482 | static void fixup_var_refs PROTO((rtx, enum machine_mode, int, | |
483 | struct hash_table *)); | |
e15679f8 RK |
484 | static struct fixup_replacement |
485 | *find_fixup_replacement PROTO((struct fixup_replacement **, rtx)); | |
486 | static void fixup_var_refs_insns PROTO((rtx, enum machine_mode, int, | |
fe9b4957 | 487 | rtx, int, struct hash_table *)); |
e15679f8 RK |
488 | static void fixup_var_refs_1 PROTO((rtx, enum machine_mode, rtx *, rtx, |
489 | struct fixup_replacement **)); | |
490 | static rtx fixup_memory_subreg PROTO((rtx, rtx, int)); | |
491 | static rtx walk_fixup_memory_subreg PROTO((rtx, rtx, int)); | |
492 | static rtx fixup_stack_1 PROTO((rtx, rtx)); | |
493 | static void optimize_bit_field PROTO((rtx, rtx, rtx *)); | |
494 | static void instantiate_decls PROTO((tree, int)); | |
495 | static void instantiate_decls_1 PROTO((tree, int)); | |
496 | static void instantiate_decl PROTO((rtx, int, int)); | |
497 | static int instantiate_virtual_regs_1 PROTO((rtx *, rtx, int)); | |
498 | static void delete_handlers PROTO((void)); | |
499 | static void pad_to_arg_alignment PROTO((struct args_size *, int)); | |
51723711 | 500 | #ifndef ARGS_GROW_DOWNWARD |
e15679f8 RK |
501 | static void pad_below PROTO((struct args_size *, enum machine_mode, |
502 | tree)); | |
51723711 | 503 | #endif |
487a6e06 | 504 | #ifdef ARGS_GROW_DOWNWARD |
e15679f8 | 505 | static tree round_down PROTO((tree, int)); |
487a6e06 | 506 | #endif |
e15679f8 RK |
507 | static rtx round_trampoline_addr PROTO((rtx)); |
508 | static tree blocks_nreverse PROTO((tree)); | |
509 | static int all_blocks PROTO((tree, tree *)); | |
081f5e7e | 510 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
487a6e06 | 511 | static int *record_insns PROTO((rtx)); |
e15679f8 | 512 | static int contains PROTO((rtx, int *)); |
081f5e7e | 513 | #endif /* HAVE_prologue || HAVE_epilogue */ |
fe9b4957 MM |
514 | static void put_addressof_into_stack PROTO((rtx, struct hash_table *)); |
515 | static void purge_addressof_1 PROTO((rtx *, rtx, int, int, | |
516 | struct hash_table *)); | |
517 | static struct hash_entry *insns_for_mem_newfunc PROTO((struct hash_entry *, | |
518 | struct hash_table *, | |
519 | hash_table_key)); | |
520 | static unsigned long insns_for_mem_hash PROTO ((hash_table_key)); | |
521 | static boolean insns_for_mem_comp PROTO ((hash_table_key, hash_table_key)); | |
522 | static int insns_for_mem_walk PROTO ((rtx *, void *)); | |
523 | static void compute_insns_for_mem PROTO ((rtx, rtx, struct hash_table *)); | |
524 | ||
c20bf1f3 | 525 | \f |
6f086dfc RS |
526 | /* Pointer to chain of `struct function' for containing functions. */ |
527 | struct function *outer_function_chain; | |
528 | ||
529 | /* Given a function decl for a containing function, | |
530 | return the `struct function' for it. */ | |
531 | ||
532 | struct function * | |
533 | find_function_data (decl) | |
534 | tree decl; | |
535 | { | |
536 | struct function *p; | |
e5e809f4 | 537 | |
6f086dfc RS |
538 | for (p = outer_function_chain; p; p = p->next) |
539 | if (p->decl == decl) | |
540 | return p; | |
e5e809f4 | 541 | |
6f086dfc RS |
542 | abort (); |
543 | } | |
544 | ||
545 | /* Save the current context for compilation of a nested function. | |
546 | This is called from language-specific code. | |
547 | The caller is responsible for saving any language-specific status, | |
6dc42e49 | 548 | since this function knows only about language-independent variables. */ |
6f086dfc RS |
549 | |
550 | void | |
a0dabda5 JM |
551 | push_function_context_to (context) |
552 | tree context; | |
6f086dfc RS |
553 | { |
554 | struct function *p = (struct function *) xmalloc (sizeof (struct function)); | |
555 | ||
556 | p->next = outer_function_chain; | |
557 | outer_function_chain = p; | |
558 | ||
559 | p->name = current_function_name; | |
560 | p->decl = current_function_decl; | |
561 | p->pops_args = current_function_pops_args; | |
562 | p->returns_struct = current_function_returns_struct; | |
563 | p->returns_pcc_struct = current_function_returns_pcc_struct; | |
1651bdfe | 564 | p->returns_pointer = current_function_returns_pointer; |
6f086dfc RS |
565 | p->needs_context = current_function_needs_context; |
566 | p->calls_setjmp = current_function_calls_setjmp; | |
567 | p->calls_longjmp = current_function_calls_longjmp; | |
568 | p->calls_alloca = current_function_calls_alloca; | |
569 | p->has_nonlocal_label = current_function_has_nonlocal_label; | |
8634413a | 570 | p->has_nonlocal_goto = current_function_has_nonlocal_goto; |
a0dabda5 | 571 | p->contains_functions = current_function_contains_functions; |
acd693d1 | 572 | p->has_computed_jump = current_function_has_computed_jump; |
173cd503 | 573 | p->is_thunk = current_function_is_thunk; |
6f086dfc RS |
574 | p->args_size = current_function_args_size; |
575 | p->pretend_args_size = current_function_pretend_args_size; | |
576 | p->arg_offset_rtx = current_function_arg_offset_rtx; | |
3b69d50e | 577 | p->varargs = current_function_varargs; |
ebb904cb | 578 | p->stdarg = current_function_stdarg; |
6f086dfc RS |
579 | p->uses_const_pool = current_function_uses_const_pool; |
580 | p->uses_pic_offset_table = current_function_uses_pic_offset_table; | |
581 | p->internal_arg_pointer = current_function_internal_arg_pointer; | |
aeb302bb | 582 | p->cannot_inline = current_function_cannot_inline; |
6f086dfc RS |
583 | p->max_parm_reg = max_parm_reg; |
584 | p->parm_reg_stack_loc = parm_reg_stack_loc; | |
585 | p->outgoing_args_size = current_function_outgoing_args_size; | |
586 | p->return_rtx = current_function_return_rtx; | |
ba716ac9 | 587 | p->nonlocal_goto_handler_slots = nonlocal_goto_handler_slots; |
e881bb1b | 588 | p->nonlocal_goto_handler_labels = nonlocal_goto_handler_labels; |
6f086dfc RS |
589 | p->nonlocal_goto_stack_level = nonlocal_goto_stack_level; |
590 | p->nonlocal_labels = nonlocal_labels; | |
591 | p->cleanup_label = cleanup_label; | |
592 | p->return_label = return_label; | |
593 | p->save_expr_regs = save_expr_regs; | |
594 | p->stack_slot_list = stack_slot_list; | |
595 | p->parm_birth_insn = parm_birth_insn; | |
596 | p->frame_offset = frame_offset; | |
597 | p->tail_recursion_label = tail_recursion_label; | |
598 | p->tail_recursion_reentry = tail_recursion_reentry; | |
599 | p->arg_pointer_save_area = arg_pointer_save_area; | |
600 | p->rtl_expr_chain = rtl_expr_chain; | |
601 | p->last_parm_insn = last_parm_insn; | |
602 | p->context_display = context_display; | |
603 | p->trampoline_list = trampoline_list; | |
604 | p->function_call_count = function_call_count; | |
605 | p->temp_slots = temp_slots; | |
606 | p->temp_slot_level = temp_slot_level; | |
e5e809f4 JL |
607 | p->target_temp_slot_level = target_temp_slot_level; |
608 | p->var_temp_slot_level = var_temp_slot_level; | |
6f086dfc | 609 | p->fixup_var_refs_queue = 0; |
f979c996 | 610 | p->epilogue_delay_list = current_function_epilogue_delay_list; |
01c1558a | 611 | p->args_info = current_function_args_info; |
7d384cc0 | 612 | p->check_memory_usage = current_function_check_memory_usage; |
07417085 | 613 | p->instrument_entry_exit = current_function_instrument_entry_exit; |
6f086dfc | 614 | |
a0dabda5 | 615 | save_tree_status (p, context); |
6f086dfc RS |
616 | save_storage_status (p); |
617 | save_emit_status (p); | |
6f086dfc RS |
618 | save_expr_status (p); |
619 | save_stmt_status (p); | |
e9a25f70 | 620 | save_varasm_status (p, context); |
46766466 RS |
621 | if (save_machine_status) |
622 | (*save_machine_status) (p); | |
6f086dfc RS |
623 | } |
624 | ||
e4a4639e JM |
625 | void |
626 | push_function_context () | |
627 | { | |
a0dabda5 | 628 | push_function_context_to (current_function_decl); |
e4a4639e JM |
629 | } |
630 | ||
6f086dfc RS |
631 | /* Restore the last saved context, at the end of a nested function. |
632 | This function is called from language-specific code. */ | |
633 | ||
634 | void | |
a0dabda5 JM |
635 | pop_function_context_from (context) |
636 | tree context; | |
6f086dfc RS |
637 | { |
638 | struct function *p = outer_function_chain; | |
e5e809f4 | 639 | struct var_refs_queue *queue; |
6f086dfc RS |
640 | |
641 | outer_function_chain = p->next; | |
642 | ||
49468af2 RK |
643 | current_function_contains_functions |
644 | = p->contains_functions || p->inline_obstacks | |
645 | || context == current_function_decl; | |
acd693d1 | 646 | current_function_has_computed_jump = p->has_computed_jump; |
6f086dfc RS |
647 | current_function_name = p->name; |
648 | current_function_decl = p->decl; | |
649 | current_function_pops_args = p->pops_args; | |
650 | current_function_returns_struct = p->returns_struct; | |
651 | current_function_returns_pcc_struct = p->returns_pcc_struct; | |
1651bdfe | 652 | current_function_returns_pointer = p->returns_pointer; |
6f086dfc RS |
653 | current_function_needs_context = p->needs_context; |
654 | current_function_calls_setjmp = p->calls_setjmp; | |
655 | current_function_calls_longjmp = p->calls_longjmp; | |
656 | current_function_calls_alloca = p->calls_alloca; | |
657 | current_function_has_nonlocal_label = p->has_nonlocal_label; | |
8634413a | 658 | current_function_has_nonlocal_goto = p->has_nonlocal_goto; |
173cd503 | 659 | current_function_is_thunk = p->is_thunk; |
6f086dfc RS |
660 | current_function_args_size = p->args_size; |
661 | current_function_pretend_args_size = p->pretend_args_size; | |
662 | current_function_arg_offset_rtx = p->arg_offset_rtx; | |
3b69d50e | 663 | current_function_varargs = p->varargs; |
ebb904cb | 664 | current_function_stdarg = p->stdarg; |
6f086dfc RS |
665 | current_function_uses_const_pool = p->uses_const_pool; |
666 | current_function_uses_pic_offset_table = p->uses_pic_offset_table; | |
667 | current_function_internal_arg_pointer = p->internal_arg_pointer; | |
aeb302bb | 668 | current_function_cannot_inline = p->cannot_inline; |
6f086dfc RS |
669 | max_parm_reg = p->max_parm_reg; |
670 | parm_reg_stack_loc = p->parm_reg_stack_loc; | |
671 | current_function_outgoing_args_size = p->outgoing_args_size; | |
672 | current_function_return_rtx = p->return_rtx; | |
ba716ac9 | 673 | nonlocal_goto_handler_slots = p->nonlocal_goto_handler_slots; |
e881bb1b | 674 | nonlocal_goto_handler_labels = p->nonlocal_goto_handler_labels; |
6f086dfc RS |
675 | nonlocal_goto_stack_level = p->nonlocal_goto_stack_level; |
676 | nonlocal_labels = p->nonlocal_labels; | |
677 | cleanup_label = p->cleanup_label; | |
678 | return_label = p->return_label; | |
679 | save_expr_regs = p->save_expr_regs; | |
680 | stack_slot_list = p->stack_slot_list; | |
681 | parm_birth_insn = p->parm_birth_insn; | |
682 | frame_offset = p->frame_offset; | |
683 | tail_recursion_label = p->tail_recursion_label; | |
684 | tail_recursion_reentry = p->tail_recursion_reentry; | |
685 | arg_pointer_save_area = p->arg_pointer_save_area; | |
686 | rtl_expr_chain = p->rtl_expr_chain; | |
687 | last_parm_insn = p->last_parm_insn; | |
688 | context_display = p->context_display; | |
689 | trampoline_list = p->trampoline_list; | |
690 | function_call_count = p->function_call_count; | |
691 | temp_slots = p->temp_slots; | |
692 | temp_slot_level = p->temp_slot_level; | |
e5e809f4 JL |
693 | target_temp_slot_level = p->target_temp_slot_level; |
694 | var_temp_slot_level = p->var_temp_slot_level; | |
f979c996 | 695 | current_function_epilogue_delay_list = p->epilogue_delay_list; |
7cbc7b0c | 696 | reg_renumber = 0; |
01c1558a | 697 | current_function_args_info = p->args_info; |
7d384cc0 | 698 | current_function_check_memory_usage = p->check_memory_usage; |
07417085 | 699 | current_function_instrument_entry_exit = p->instrument_entry_exit; |
6f086dfc | 700 | |
d1485032 | 701 | restore_tree_status (p, context); |
6f086dfc RS |
702 | restore_storage_status (p); |
703 | restore_expr_status (p); | |
704 | restore_emit_status (p); | |
705 | restore_stmt_status (p); | |
a506307a | 706 | restore_varasm_status (p); |
6f086dfc | 707 | |
46766466 RS |
708 | if (restore_machine_status) |
709 | (*restore_machine_status) (p); | |
710 | ||
6f086dfc RS |
711 | /* Finish doing put_var_into_stack for any of our variables |
712 | which became addressable during the nested function. */ | |
e5e809f4 | 713 | for (queue = p->fixup_var_refs_queue; queue; queue = queue->next) |
fe9b4957 MM |
714 | fixup_var_refs (queue->modified, queue->promoted_mode, |
715 | queue->unsignedp, 0); | |
6f086dfc RS |
716 | |
717 | free (p); | |
718 | ||
719 | /* Reset variables that have known state during rtx generation. */ | |
720 | rtx_equal_function_value_matters = 1; | |
721 | virtuals_instantiated = 0; | |
722 | } | |
e4a4639e JM |
723 | |
724 | void pop_function_context () | |
725 | { | |
a0dabda5 | 726 | pop_function_context_from (current_function_decl); |
e4a4639e | 727 | } |
6f086dfc RS |
728 | \f |
729 | /* Allocate fixed slots in the stack frame of the current function. */ | |
730 | ||
731 | /* Return size needed for stack frame based on slots so far allocated. | |
c795bca9 | 732 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; |
6f086dfc RS |
733 | the caller may have to do that. */ |
734 | ||
8af5168b | 735 | HOST_WIDE_INT |
6f086dfc RS |
736 | get_frame_size () |
737 | { | |
738 | #ifdef FRAME_GROWS_DOWNWARD | |
739 | return -frame_offset; | |
740 | #else | |
741 | return frame_offset; | |
742 | #endif | |
743 | } | |
744 | ||
745 | /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it | |
746 | with machine mode MODE. | |
747 | ||
748 | ALIGN controls the amount of alignment for the address of the slot: | |
749 | 0 means according to MODE, | |
750 | -1 means use BIGGEST_ALIGNMENT and round size to multiple of that, | |
751 | positive specifies alignment boundary in bits. | |
752 | ||
753 | We do not round to stack_boundary here. */ | |
754 | ||
755 | rtx | |
756 | assign_stack_local (mode, size, align) | |
757 | enum machine_mode mode; | |
e5e809f4 | 758 | HOST_WIDE_INT size; |
6f086dfc RS |
759 | int align; |
760 | { | |
761 | register rtx x, addr; | |
762 | int bigend_correction = 0; | |
763 | int alignment; | |
764 | ||
765 | if (align == 0) | |
766 | { | |
d16790f2 JW |
767 | tree type; |
768 | ||
769 | alignment = GET_MODE_ALIGNMENT (mode); | |
6f086dfc | 770 | if (mode == BLKmode) |
d16790f2 JW |
771 | alignment = BIGGEST_ALIGNMENT; |
772 | ||
773 | /* Allow the target to (possibly) increase the alignment of this | |
774 | stack slot. */ | |
775 | type = type_for_mode (mode, 0); | |
776 | if (type) | |
777 | alignment = LOCAL_ALIGNMENT (type, alignment); | |
778 | ||
779 | alignment /= BITS_PER_UNIT; | |
6f086dfc RS |
780 | } |
781 | else if (align == -1) | |
782 | { | |
783 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
784 | size = CEIL_ROUND (size, alignment); | |
785 | } | |
786 | else | |
787 | alignment = align / BITS_PER_UNIT; | |
788 | ||
6f086dfc RS |
789 | /* Round frame offset to that alignment. |
790 | We must be careful here, since FRAME_OFFSET might be negative and | |
791 | division with a negative dividend isn't as well defined as we might | |
792 | like. So we instead assume that ALIGNMENT is a power of two and | |
793 | use logical operations which are unambiguous. */ | |
794 | #ifdef FRAME_GROWS_DOWNWARD | |
795 | frame_offset = FLOOR_ROUND (frame_offset, alignment); | |
796 | #else | |
797 | frame_offset = CEIL_ROUND (frame_offset, alignment); | |
798 | #endif | |
799 | ||
800 | /* On a big-endian machine, if we are allocating more space than we will use, | |
801 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 802 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 803 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc RS |
804 | |
805 | #ifdef FRAME_GROWS_DOWNWARD | |
806 | frame_offset -= size; | |
807 | #endif | |
808 | ||
809 | /* If we have already instantiated virtual registers, return the actual | |
810 | address relative to the frame pointer. */ | |
811 | if (virtuals_instantiated) | |
812 | addr = plus_constant (frame_pointer_rtx, | |
813 | (frame_offset + bigend_correction | |
814 | + STARTING_FRAME_OFFSET)); | |
815 | else | |
816 | addr = plus_constant (virtual_stack_vars_rtx, | |
817 | frame_offset + bigend_correction); | |
818 | ||
819 | #ifndef FRAME_GROWS_DOWNWARD | |
820 | frame_offset += size; | |
821 | #endif | |
822 | ||
38a448ca | 823 | x = gen_rtx_MEM (mode, addr); |
6f086dfc | 824 | |
38a448ca | 825 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, x, stack_slot_list); |
6f086dfc RS |
826 | |
827 | return x; | |
828 | } | |
829 | ||
830 | /* Assign a stack slot in a containing function. | |
831 | First three arguments are same as in preceding function. | |
832 | The last argument specifies the function to allocate in. */ | |
833 | ||
1ac4f799 | 834 | static rtx |
6f086dfc RS |
835 | assign_outer_stack_local (mode, size, align, function) |
836 | enum machine_mode mode; | |
e5e809f4 | 837 | HOST_WIDE_INT size; |
6f086dfc RS |
838 | int align; |
839 | struct function *function; | |
840 | { | |
841 | register rtx x, addr; | |
842 | int bigend_correction = 0; | |
843 | int alignment; | |
844 | ||
845 | /* Allocate in the memory associated with the function in whose frame | |
846 | we are assigning. */ | |
847 | push_obstacks (function->function_obstack, | |
848 | function->function_maybepermanent_obstack); | |
849 | ||
850 | if (align == 0) | |
851 | { | |
d16790f2 JW |
852 | tree type; |
853 | ||
854 | alignment = GET_MODE_ALIGNMENT (mode); | |
6f086dfc | 855 | if (mode == BLKmode) |
d16790f2 JW |
856 | alignment = BIGGEST_ALIGNMENT; |
857 | ||
858 | /* Allow the target to (possibly) increase the alignment of this | |
859 | stack slot. */ | |
860 | type = type_for_mode (mode, 0); | |
861 | if (type) | |
862 | alignment = LOCAL_ALIGNMENT (type, alignment); | |
863 | ||
864 | alignment /= BITS_PER_UNIT; | |
6f086dfc RS |
865 | } |
866 | else if (align == -1) | |
867 | { | |
868 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
869 | size = CEIL_ROUND (size, alignment); | |
870 | } | |
871 | else | |
872 | alignment = align / BITS_PER_UNIT; | |
873 | ||
6f086dfc RS |
874 | /* Round frame offset to that alignment. */ |
875 | #ifdef FRAME_GROWS_DOWNWARD | |
2af69b62 | 876 | function->frame_offset = FLOOR_ROUND (function->frame_offset, alignment); |
6f086dfc | 877 | #else |
2af69b62 | 878 | function->frame_offset = CEIL_ROUND (function->frame_offset, alignment); |
6f086dfc RS |
879 | #endif |
880 | ||
881 | /* On a big-endian machine, if we are allocating more space than we will use, | |
882 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 883 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 884 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc RS |
885 | |
886 | #ifdef FRAME_GROWS_DOWNWARD | |
887 | function->frame_offset -= size; | |
888 | #endif | |
889 | addr = plus_constant (virtual_stack_vars_rtx, | |
890 | function->frame_offset + bigend_correction); | |
891 | #ifndef FRAME_GROWS_DOWNWARD | |
892 | function->frame_offset += size; | |
893 | #endif | |
894 | ||
38a448ca | 895 | x = gen_rtx_MEM (mode, addr); |
6f086dfc RS |
896 | |
897 | function->stack_slot_list | |
38a448ca | 898 | = gen_rtx_EXPR_LIST (VOIDmode, x, function->stack_slot_list); |
6f086dfc RS |
899 | |
900 | pop_obstacks (); | |
901 | ||
902 | return x; | |
903 | } | |
904 | \f | |
905 | /* Allocate a temporary stack slot and record it for possible later | |
906 | reuse. | |
907 | ||
908 | MODE is the machine mode to be given to the returned rtx. | |
909 | ||
910 | SIZE is the size in units of the space required. We do no rounding here | |
911 | since assign_stack_local will do any required rounding. | |
912 | ||
d93d4205 MS |
913 | KEEP is 1 if this slot is to be retained after a call to |
914 | free_temp_slots. Automatic variables for a block are allocated | |
e5e809f4 JL |
915 | with this flag. KEEP is 2 if we allocate a longer term temporary, |
916 | whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3 | |
917 | if we are to allocate something at an inner level to be treated as | |
a4c6502a MM |
918 | a variable in the block (e.g., a SAVE_EXPR). |
919 | ||
920 | TYPE is the type that will be used for the stack slot. */ | |
6f086dfc | 921 | |
d16790f2 JW |
922 | static rtx |
923 | assign_stack_temp_for_type (mode, size, keep, type) | |
6f086dfc | 924 | enum machine_mode mode; |
e5e809f4 | 925 | HOST_WIDE_INT size; |
6f086dfc | 926 | int keep; |
d16790f2 | 927 | tree type; |
6f086dfc | 928 | { |
d16790f2 | 929 | int align; |
a4c6502a | 930 | int alias_set; |
6f086dfc RS |
931 | struct temp_slot *p, *best_p = 0; |
932 | ||
303ec2aa RK |
933 | /* If SIZE is -1 it means that somebody tried to allocate a temporary |
934 | of a variable size. */ | |
935 | if (size == -1) | |
936 | abort (); | |
937 | ||
a4c6502a MM |
938 | /* If we know the alias set for the memory that will be used, use |
939 | it. If there's no TYPE, then we don't know anything about the | |
940 | alias set for the memory. */ | |
941 | if (type) | |
942 | alias_set = get_alias_set (type); | |
943 | else | |
944 | alias_set = 0; | |
945 | ||
d16790f2 JW |
946 | align = GET_MODE_ALIGNMENT (mode); |
947 | if (mode == BLKmode) | |
948 | align = BIGGEST_ALIGNMENT; | |
6f086dfc | 949 | |
d16790f2 JW |
950 | if (! type) |
951 | type = type_for_mode (mode, 0); | |
952 | if (type) | |
953 | align = LOCAL_ALIGNMENT (type, align); | |
954 | ||
955 | /* Try to find an available, already-allocated temporary of the proper | |
956 | mode which meets the size and alignment requirements. Choose the | |
957 | smallest one with the closest alignment. */ | |
958 | for (p = temp_slots; p; p = p->next) | |
959 | if (p->align >= align && p->size >= size && GET_MODE (p->slot) == mode | |
960 | && ! p->in_use | |
a4c6502a MM |
961 | && (!flag_strict_aliasing |
962 | || (alias_set && p->alias_set == alias_set)) | |
d16790f2 JW |
963 | && (best_p == 0 || best_p->size > p->size |
964 | || (best_p->size == p->size && best_p->align > p->align))) | |
965 | { | |
966 | if (p->align == align && p->size == size) | |
967 | { | |
968 | best_p = 0; | |
969 | break; | |
970 | } | |
6f086dfc | 971 | best_p = p; |
d16790f2 | 972 | } |
6f086dfc RS |
973 | |
974 | /* Make our best, if any, the one to use. */ | |
975 | if (best_p) | |
a45035b6 JW |
976 | { |
977 | /* If there are enough aligned bytes left over, make them into a new | |
978 | temp_slot so that the extra bytes don't get wasted. Do this only | |
979 | for BLKmode slots, so that we can be sure of the alignment. */ | |
a4c6502a MM |
980 | if (GET_MODE (best_p->slot) == BLKmode |
981 | /* We can't split slots if -fstrict-aliasing because the | |
982 | information about the alias set for the new slot will be | |
983 | lost. */ | |
984 | && !flag_strict_aliasing) | |
a45035b6 | 985 | { |
d16790f2 | 986 | int alignment = best_p->align / BITS_PER_UNIT; |
e5e809f4 | 987 | HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment); |
a45035b6 JW |
988 | |
989 | if (best_p->size - rounded_size >= alignment) | |
990 | { | |
991 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); | |
a25d4ba2 | 992 | p->in_use = p->addr_taken = 0; |
a45035b6 | 993 | p->size = best_p->size - rounded_size; |
307d8cd6 RK |
994 | p->base_offset = best_p->base_offset + rounded_size; |
995 | p->full_size = best_p->full_size - rounded_size; | |
38a448ca RH |
996 | p->slot = gen_rtx_MEM (BLKmode, |
997 | plus_constant (XEXP (best_p->slot, 0), | |
998 | rounded_size)); | |
d16790f2 | 999 | p->align = best_p->align; |
e5e76139 | 1000 | p->address = 0; |
84e24c03 | 1001 | p->rtl_expr = 0; |
a45035b6 JW |
1002 | p->next = temp_slots; |
1003 | temp_slots = p; | |
1004 | ||
38a448ca RH |
1005 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot, |
1006 | stack_slot_list); | |
a45035b6 JW |
1007 | |
1008 | best_p->size = rounded_size; | |
291dde90 | 1009 | best_p->full_size = rounded_size; |
a45035b6 JW |
1010 | } |
1011 | } | |
1012 | ||
1013 | p = best_p; | |
1014 | } | |
1015 | ||
6f086dfc RS |
1016 | /* If we still didn't find one, make a new temporary. */ |
1017 | if (p == 0) | |
1018 | { | |
e5e809f4 JL |
1019 | HOST_WIDE_INT frame_offset_old = frame_offset; |
1020 | ||
6f086dfc | 1021 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); |
e5e809f4 | 1022 | |
c87a0a39 JL |
1023 | /* We are passing an explicit alignment request to assign_stack_local. |
1024 | One side effect of that is assign_stack_local will not round SIZE | |
1025 | to ensure the frame offset remains suitably aligned. | |
1026 | ||
1027 | So for requests which depended on the rounding of SIZE, we go ahead | |
1028 | and round it now. We also make sure ALIGNMENT is at least | |
1029 | BIGGEST_ALIGNMENT. */ | |
6f67a30d JW |
1030 | if (mode == BLKmode && align < (BIGGEST_ALIGNMENT / BITS_PER_UNIT)) |
1031 | abort(); | |
1032 | p->slot = assign_stack_local (mode, | |
1033 | mode == BLKmode | |
1034 | ? CEIL_ROUND (size, align) : size, | |
1035 | align); | |
d16790f2 JW |
1036 | |
1037 | p->align = align; | |
a4c6502a | 1038 | p->alias_set = alias_set; |
e5e809f4 | 1039 | |
b2a80c0d DE |
1040 | /* The following slot size computation is necessary because we don't |
1041 | know the actual size of the temporary slot until assign_stack_local | |
1042 | has performed all the frame alignment and size rounding for the | |
fc91b0d0 RK |
1043 | requested temporary. Note that extra space added for alignment |
1044 | can be either above or below this stack slot depending on which | |
1045 | way the frame grows. We include the extra space if and only if it | |
1046 | is above this slot. */ | |
b2a80c0d DE |
1047 | #ifdef FRAME_GROWS_DOWNWARD |
1048 | p->size = frame_offset_old - frame_offset; | |
1049 | #else | |
fc91b0d0 RK |
1050 | p->size = size; |
1051 | #endif | |
e5e809f4 | 1052 | |
fc91b0d0 RK |
1053 | /* Now define the fields used by combine_temp_slots. */ |
1054 | #ifdef FRAME_GROWS_DOWNWARD | |
1055 | p->base_offset = frame_offset; | |
1056 | p->full_size = frame_offset_old - frame_offset; | |
1057 | #else | |
1058 | p->base_offset = frame_offset_old; | |
1059 | p->full_size = frame_offset - frame_offset_old; | |
b2a80c0d | 1060 | #endif |
e5e76139 | 1061 | p->address = 0; |
6f086dfc RS |
1062 | p->next = temp_slots; |
1063 | temp_slots = p; | |
1064 | } | |
1065 | ||
1066 | p->in_use = 1; | |
a25d4ba2 | 1067 | p->addr_taken = 0; |
e7a84011 | 1068 | p->rtl_expr = sequence_rtl_expr; |
a25d4ba2 | 1069 | |
d93d4205 MS |
1070 | if (keep == 2) |
1071 | { | |
1072 | p->level = target_temp_slot_level; | |
1073 | p->keep = 0; | |
1074 | } | |
e5e809f4 JL |
1075 | else if (keep == 3) |
1076 | { | |
1077 | p->level = var_temp_slot_level; | |
1078 | p->keep = 0; | |
1079 | } | |
d93d4205 MS |
1080 | else |
1081 | { | |
1082 | p->level = temp_slot_level; | |
1083 | p->keep = keep; | |
1084 | } | |
1995f267 RK |
1085 | |
1086 | /* We may be reusing an old slot, so clear any MEM flags that may have been | |
1087 | set from before. */ | |
1088 | RTX_UNCHANGING_P (p->slot) = 0; | |
1089 | MEM_IN_STRUCT_P (p->slot) = 0; | |
c6df88cb MM |
1090 | MEM_SCALAR_P (p->slot) = 0; |
1091 | MEM_ALIAS_SET (p->slot) = 0; | |
6f086dfc RS |
1092 | return p->slot; |
1093 | } | |
d16790f2 JW |
1094 | |
1095 | /* Allocate a temporary stack slot and record it for possible later | |
1096 | reuse. First three arguments are same as in preceding function. */ | |
1097 | ||
1098 | rtx | |
1099 | assign_stack_temp (mode, size, keep) | |
1100 | enum machine_mode mode; | |
1101 | HOST_WIDE_INT size; | |
1102 | int keep; | |
1103 | { | |
1104 | return assign_stack_temp_for_type (mode, size, keep, NULL_TREE); | |
1105 | } | |
638141a6 | 1106 | \f |
230f21b4 PB |
1107 | /* Assign a temporary of given TYPE. |
1108 | KEEP is as for assign_stack_temp. | |
1109 | MEMORY_REQUIRED is 1 if the result must be addressable stack memory; | |
b55d9ff8 RK |
1110 | it is 0 if a register is OK. |
1111 | DONT_PROMOTE is 1 if we should not promote values in register | |
1112 | to wider modes. */ | |
230f21b4 PB |
1113 | |
1114 | rtx | |
b55d9ff8 | 1115 | assign_temp (type, keep, memory_required, dont_promote) |
230f21b4 PB |
1116 | tree type; |
1117 | int keep; | |
1118 | int memory_required; | |
b55d9ff8 | 1119 | int dont_promote; |
230f21b4 PB |
1120 | { |
1121 | enum machine_mode mode = TYPE_MODE (type); | |
638141a6 RK |
1122 | int unsignedp = TREE_UNSIGNED (type); |
1123 | ||
230f21b4 PB |
1124 | if (mode == BLKmode || memory_required) |
1125 | { | |
e5e809f4 | 1126 | HOST_WIDE_INT size = int_size_in_bytes (type); |
230f21b4 PB |
1127 | rtx tmp; |
1128 | ||
1129 | /* Unfortunately, we don't yet know how to allocate variable-sized | |
1130 | temporaries. However, sometimes we have a fixed upper limit on | |
1131 | the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that | |
0f41302f | 1132 | instead. This is the case for Chill variable-sized strings. */ |
230f21b4 PB |
1133 | if (size == -1 && TREE_CODE (type) == ARRAY_TYPE |
1134 | && TYPE_ARRAY_MAX_SIZE (type) != NULL_TREE | |
1135 | && TREE_CODE (TYPE_ARRAY_MAX_SIZE (type)) == INTEGER_CST) | |
1136 | size = TREE_INT_CST_LOW (TYPE_ARRAY_MAX_SIZE (type)); | |
1137 | ||
d16790f2 | 1138 | tmp = assign_stack_temp_for_type (mode, size, keep, type); |
c6df88cb | 1139 | MEM_SET_IN_STRUCT_P (tmp, AGGREGATE_TYPE_P (type)); |
230f21b4 PB |
1140 | return tmp; |
1141 | } | |
638141a6 | 1142 | |
230f21b4 | 1143 | #ifndef PROMOTE_FOR_CALL_ONLY |
b55d9ff8 RK |
1144 | if (! dont_promote) |
1145 | mode = promote_mode (type, mode, &unsignedp, 0); | |
230f21b4 | 1146 | #endif |
638141a6 | 1147 | |
230f21b4 PB |
1148 | return gen_reg_rtx (mode); |
1149 | } | |
638141a6 | 1150 | \f |
a45035b6 JW |
1151 | /* Combine temporary stack slots which are adjacent on the stack. |
1152 | ||
1153 | This allows for better use of already allocated stack space. This is only | |
1154 | done for BLKmode slots because we can be sure that we won't have alignment | |
1155 | problems in this case. */ | |
1156 | ||
1157 | void | |
1158 | combine_temp_slots () | |
1159 | { | |
1160 | struct temp_slot *p, *q; | |
1161 | struct temp_slot *prev_p, *prev_q; | |
e5e809f4 JL |
1162 | int num_slots; |
1163 | ||
a4c6502a MM |
1164 | /* We can't combine slots, because the information about which slot |
1165 | is in which alias set will be lost. */ | |
1166 | if (flag_strict_aliasing) | |
1167 | return; | |
1168 | ||
e5e809f4 JL |
1169 | /* If there are a lot of temp slots, don't do anything unless |
1170 | high levels of optimizaton. */ | |
1171 | if (! flag_expensive_optimizations) | |
1172 | for (p = temp_slots, num_slots = 0; p; p = p->next, num_slots++) | |
1173 | if (num_slots > 100 || (num_slots > 10 && optimize == 0)) | |
1174 | return; | |
a45035b6 | 1175 | |
e9b7093a RS |
1176 | for (p = temp_slots, prev_p = 0; p; p = prev_p ? prev_p->next : temp_slots) |
1177 | { | |
1178 | int delete_p = 0; | |
e5e809f4 | 1179 | |
e9b7093a RS |
1180 | if (! p->in_use && GET_MODE (p->slot) == BLKmode) |
1181 | for (q = p->next, prev_q = p; q; q = prev_q->next) | |
a45035b6 | 1182 | { |
e9b7093a RS |
1183 | int delete_q = 0; |
1184 | if (! q->in_use && GET_MODE (q->slot) == BLKmode) | |
a45035b6 | 1185 | { |
fc91b0d0 | 1186 | if (p->base_offset + p->full_size == q->base_offset) |
e9b7093a RS |
1187 | { |
1188 | /* Q comes after P; combine Q into P. */ | |
1189 | p->size += q->size; | |
307d8cd6 | 1190 | p->full_size += q->full_size; |
e9b7093a RS |
1191 | delete_q = 1; |
1192 | } | |
fc91b0d0 | 1193 | else if (q->base_offset + q->full_size == p->base_offset) |
e9b7093a RS |
1194 | { |
1195 | /* P comes after Q; combine P into Q. */ | |
1196 | q->size += p->size; | |
307d8cd6 | 1197 | q->full_size += p->full_size; |
e9b7093a RS |
1198 | delete_p = 1; |
1199 | break; | |
1200 | } | |
a45035b6 | 1201 | } |
e9b7093a RS |
1202 | /* Either delete Q or advance past it. */ |
1203 | if (delete_q) | |
1204 | prev_q->next = q->next; | |
1205 | else | |
1206 | prev_q = q; | |
a45035b6 | 1207 | } |
e9b7093a RS |
1208 | /* Either delete P or advance past it. */ |
1209 | if (delete_p) | |
1210 | { | |
1211 | if (prev_p) | |
1212 | prev_p->next = p->next; | |
1213 | else | |
1214 | temp_slots = p->next; | |
1215 | } | |
1216 | else | |
1217 | prev_p = p; | |
1218 | } | |
a45035b6 | 1219 | } |
6f086dfc | 1220 | \f |
e5e76139 RK |
1221 | /* Find the temp slot corresponding to the object at address X. */ |
1222 | ||
1223 | static struct temp_slot * | |
1224 | find_temp_slot_from_address (x) | |
1225 | rtx x; | |
1226 | { | |
1227 | struct temp_slot *p; | |
1228 | rtx next; | |
1229 | ||
1230 | for (p = temp_slots; p; p = p->next) | |
1231 | { | |
1232 | if (! p->in_use) | |
1233 | continue; | |
e5e809f4 | 1234 | |
e5e76139 | 1235 | else if (XEXP (p->slot, 0) == x |
abb52246 RK |
1236 | || p->address == x |
1237 | || (GET_CODE (x) == PLUS | |
1238 | && XEXP (x, 0) == virtual_stack_vars_rtx | |
1239 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
1240 | && INTVAL (XEXP (x, 1)) >= p->base_offset | |
1241 | && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size)) | |
e5e76139 RK |
1242 | return p; |
1243 | ||
1244 | else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST) | |
1245 | for (next = p->address; next; next = XEXP (next, 1)) | |
1246 | if (XEXP (next, 0) == x) | |
1247 | return p; | |
1248 | } | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
9faa82d8 | 1253 | /* Indicate that NEW is an alternate way of referring to the temp slot |
e5e809f4 | 1254 | that previously was known by OLD. */ |
e5e76139 RK |
1255 | |
1256 | void | |
1257 | update_temp_slot_address (old, new) | |
1258 | rtx old, new; | |
1259 | { | |
1260 | struct temp_slot *p = find_temp_slot_from_address (old); | |
1261 | ||
1262 | /* If none, return. Else add NEW as an alias. */ | |
1263 | if (p == 0) | |
1264 | return; | |
1265 | else if (p->address == 0) | |
1266 | p->address = new; | |
1267 | else | |
1268 | { | |
1269 | if (GET_CODE (p->address) != EXPR_LIST) | |
38a448ca | 1270 | p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX); |
e5e76139 | 1271 | |
38a448ca | 1272 | p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address); |
e5e76139 RK |
1273 | } |
1274 | } | |
1275 | ||
a25d4ba2 | 1276 | /* If X could be a reference to a temporary slot, mark the fact that its |
9faa82d8 | 1277 | address was taken. */ |
a25d4ba2 RK |
1278 | |
1279 | void | |
1280 | mark_temp_addr_taken (x) | |
1281 | rtx x; | |
1282 | { | |
1283 | struct temp_slot *p; | |
1284 | ||
1285 | if (x == 0) | |
1286 | return; | |
1287 | ||
1288 | /* If X is not in memory or is at a constant address, it cannot be in | |
1289 | a temporary slot. */ | |
1290 | if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1291 | return; | |
1292 | ||
1293 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1294 | if (p != 0) | |
1295 | p->addr_taken = 1; | |
1296 | } | |
1297 | ||
9cca6a99 MS |
1298 | /* If X could be a reference to a temporary slot, mark that slot as |
1299 | belonging to the to one level higher than the current level. If X | |
1300 | matched one of our slots, just mark that one. Otherwise, we can't | |
1301 | easily predict which it is, so upgrade all of them. Kept slots | |
1302 | need not be touched. | |
6f086dfc RS |
1303 | |
1304 | This is called when an ({...}) construct occurs and a statement | |
1305 | returns a value in memory. */ | |
1306 | ||
1307 | void | |
1308 | preserve_temp_slots (x) | |
1309 | rtx x; | |
1310 | { | |
a25d4ba2 | 1311 | struct temp_slot *p = 0; |
6f086dfc | 1312 | |
73620b82 RK |
1313 | /* If there is no result, we still might have some objects whose address |
1314 | were taken, so we need to make sure they stay around. */ | |
e3a77161 | 1315 | if (x == 0) |
73620b82 RK |
1316 | { |
1317 | for (p = temp_slots; p; p = p->next) | |
1318 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1319 | p->level--; | |
1320 | ||
1321 | return; | |
1322 | } | |
e3a77161 RK |
1323 | |
1324 | /* If X is a register that is being used as a pointer, see if we have | |
1325 | a temporary slot we know it points to. To be consistent with | |
1326 | the code below, we really should preserve all non-kept slots | |
1327 | if we can't find a match, but that seems to be much too costly. */ | |
a25d4ba2 RK |
1328 | if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))) |
1329 | p = find_temp_slot_from_address (x); | |
1330 | ||
6f086dfc | 1331 | /* If X is not in memory or is at a constant address, it cannot be in |
e19571db RK |
1332 | a temporary slot, but it can contain something whose address was |
1333 | taken. */ | |
a25d4ba2 | 1334 | if (p == 0 && (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))) |
e19571db RK |
1335 | { |
1336 | for (p = temp_slots; p; p = p->next) | |
1337 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1338 | p->level--; | |
1339 | ||
1340 | return; | |
1341 | } | |
6f086dfc RS |
1342 | |
1343 | /* First see if we can find a match. */ | |
73620b82 | 1344 | if (p == 0) |
a25d4ba2 RK |
1345 | p = find_temp_slot_from_address (XEXP (x, 0)); |
1346 | ||
e5e76139 RK |
1347 | if (p != 0) |
1348 | { | |
a25d4ba2 RK |
1349 | /* Move everything at our level whose address was taken to our new |
1350 | level in case we used its address. */ | |
1351 | struct temp_slot *q; | |
1352 | ||
9cca6a99 MS |
1353 | if (p->level == temp_slot_level) |
1354 | { | |
1355 | for (q = temp_slots; q; q = q->next) | |
1356 | if (q != p && q->addr_taken && q->level == p->level) | |
1357 | q->level--; | |
a25d4ba2 | 1358 | |
9cca6a99 MS |
1359 | p->level--; |
1360 | p->addr_taken = 0; | |
1361 | } | |
e5e76139 RK |
1362 | return; |
1363 | } | |
6f086dfc RS |
1364 | |
1365 | /* Otherwise, preserve all non-kept slots at this level. */ | |
1366 | for (p = temp_slots; p; p = p->next) | |
1367 | if (p->in_use && p->level == temp_slot_level && ! p->keep) | |
1368 | p->level--; | |
1369 | } | |
1370 | ||
422c8f63 RK |
1371 | /* X is the result of an RTL_EXPR. If it is a temporary slot associated |
1372 | with that RTL_EXPR, promote it into a temporary slot at the present | |
1373 | level so it will not be freed when we free slots made in the | |
1374 | RTL_EXPR. */ | |
1375 | ||
1376 | void | |
1377 | preserve_rtl_expr_result (x) | |
1378 | rtx x; | |
1379 | { | |
1380 | struct temp_slot *p; | |
1381 | ||
1382 | /* If X is not in memory or is at a constant address, it cannot be in | |
1383 | a temporary slot. */ | |
1384 | if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1385 | return; | |
1386 | ||
199b61d8 RK |
1387 | /* If we can find a match, move it to our level unless it is already at |
1388 | an upper level. */ | |
1389 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1390 | if (p != 0) | |
1391 | { | |
1392 | p->level = MIN (p->level, temp_slot_level); | |
1393 | p->rtl_expr = 0; | |
1394 | } | |
422c8f63 RK |
1395 | |
1396 | return; | |
1397 | } | |
1398 | ||
6f086dfc | 1399 | /* Free all temporaries used so far. This is normally called at the end |
e7a84011 RK |
1400 | of generating code for a statement. Don't free any temporaries |
1401 | currently in use for an RTL_EXPR that hasn't yet been emitted. | |
1402 | We could eventually do better than this since it can be reused while | |
1403 | generating the same RTL_EXPR, but this is complex and probably not | |
1404 | worthwhile. */ | |
6f086dfc RS |
1405 | |
1406 | void | |
1407 | free_temp_slots () | |
1408 | { | |
1409 | struct temp_slot *p; | |
1410 | ||
1411 | for (p = temp_slots; p; p = p->next) | |
e7a84011 RK |
1412 | if (p->in_use && p->level == temp_slot_level && ! p->keep |
1413 | && p->rtl_expr == 0) | |
1414 | p->in_use = 0; | |
1415 | ||
1416 | combine_temp_slots (); | |
1417 | } | |
1418 | ||
1419 | /* Free all temporary slots used in T, an RTL_EXPR node. */ | |
1420 | ||
1421 | void | |
1422 | free_temps_for_rtl_expr (t) | |
1423 | tree t; | |
1424 | { | |
1425 | struct temp_slot *p; | |
1426 | ||
1427 | for (p = temp_slots; p; p = p->next) | |
1428 | if (p->rtl_expr == t) | |
6f086dfc | 1429 | p->in_use = 0; |
a45035b6 JW |
1430 | |
1431 | combine_temp_slots (); | |
6f086dfc RS |
1432 | } |
1433 | ||
956d6950 | 1434 | /* Mark all temporaries ever allocated in this function as not suitable |
a94e4054 RK |
1435 | for reuse until the current level is exited. */ |
1436 | ||
1437 | void | |
1438 | mark_all_temps_used () | |
1439 | { | |
1440 | struct temp_slot *p; | |
1441 | ||
1442 | for (p = temp_slots; p; p = p->next) | |
1443 | { | |
85b119d1 | 1444 | p->in_use = p->keep = 1; |
27ce006b | 1445 | p->level = MIN (p->level, temp_slot_level); |
a94e4054 RK |
1446 | } |
1447 | } | |
1448 | ||
6f086dfc RS |
1449 | /* Push deeper into the nesting level for stack temporaries. */ |
1450 | ||
1451 | void | |
1452 | push_temp_slots () | |
1453 | { | |
6f086dfc RS |
1454 | temp_slot_level++; |
1455 | } | |
1456 | ||
e5e809f4 JL |
1457 | /* Likewise, but save the new level as the place to allocate variables |
1458 | for blocks. */ | |
1459 | ||
1460 | void | |
1461 | push_temp_slots_for_block () | |
1462 | { | |
1463 | push_temp_slots (); | |
1464 | ||
1465 | var_temp_slot_level = temp_slot_level; | |
1466 | } | |
1467 | ||
f5963e61 JL |
1468 | /* Likewise, but save the new level as the place to allocate temporaries |
1469 | for TARGET_EXPRs. */ | |
1470 | ||
1471 | void | |
1472 | push_temp_slots_for_target () | |
1473 | { | |
1474 | push_temp_slots (); | |
1475 | ||
1476 | target_temp_slot_level = temp_slot_level; | |
1477 | } | |
1478 | ||
1479 | /* Set and get the value of target_temp_slot_level. The only | |
1480 | permitted use of these functions is to save and restore this value. */ | |
1481 | ||
1482 | int | |
1483 | get_target_temp_slot_level () | |
1484 | { | |
1485 | return target_temp_slot_level; | |
1486 | } | |
1487 | ||
1488 | void | |
1489 | set_target_temp_slot_level (level) | |
1490 | int level; | |
1491 | { | |
1492 | target_temp_slot_level = level; | |
1493 | } | |
1494 | ||
6f086dfc RS |
1495 | /* Pop a temporary nesting level. All slots in use in the current level |
1496 | are freed. */ | |
1497 | ||
1498 | void | |
1499 | pop_temp_slots () | |
1500 | { | |
1501 | struct temp_slot *p; | |
1502 | ||
6f086dfc | 1503 | for (p = temp_slots; p; p = p->next) |
e7a84011 | 1504 | if (p->in_use && p->level == temp_slot_level && p->rtl_expr == 0) |
6f086dfc RS |
1505 | p->in_use = 0; |
1506 | ||
a45035b6 JW |
1507 | combine_temp_slots (); |
1508 | ||
6f086dfc RS |
1509 | temp_slot_level--; |
1510 | } | |
bc0ebdf9 RK |
1511 | |
1512 | /* Initialize temporary slots. */ | |
1513 | ||
1514 | void | |
1515 | init_temp_slots () | |
1516 | { | |
1517 | /* We have not allocated any temporaries yet. */ | |
1518 | temp_slots = 0; | |
1519 | temp_slot_level = 0; | |
e5e809f4 | 1520 | var_temp_slot_level = 0; |
bc0ebdf9 RK |
1521 | target_temp_slot_level = 0; |
1522 | } | |
6f086dfc RS |
1523 | \f |
1524 | /* Retroactively move an auto variable from a register to a stack slot. | |
1525 | This is done when an address-reference to the variable is seen. */ | |
1526 | ||
1527 | void | |
1528 | put_var_into_stack (decl) | |
1529 | tree decl; | |
1530 | { | |
1531 | register rtx reg; | |
00d8a4c1 | 1532 | enum machine_mode promoted_mode, decl_mode; |
6f086dfc | 1533 | struct function *function = 0; |
c20bf1f3 | 1534 | tree context; |
e9a25f70 | 1535 | int can_use_addressof; |
c20bf1f3 | 1536 | |
c20bf1f3 | 1537 | context = decl_function_context (decl); |
6f086dfc | 1538 | |
9ec36da5 | 1539 | /* Get the current rtl used for this object and its original mode. */ |
6f086dfc | 1540 | reg = TREE_CODE (decl) == SAVE_EXPR ? SAVE_EXPR_RTL (decl) : DECL_RTL (decl); |
2baccce2 RS |
1541 | |
1542 | /* No need to do anything if decl has no rtx yet | |
1543 | since in that case caller is setting TREE_ADDRESSABLE | |
1544 | and a stack slot will be assigned when the rtl is made. */ | |
1545 | if (reg == 0) | |
1546 | return; | |
00d8a4c1 RK |
1547 | |
1548 | /* Get the declared mode for this object. */ | |
1549 | decl_mode = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl)) | |
1550 | : DECL_MODE (decl)); | |
2baccce2 RS |
1551 | /* Get the mode it's actually stored in. */ |
1552 | promoted_mode = GET_MODE (reg); | |
6f086dfc RS |
1553 | |
1554 | /* If this variable comes from an outer function, | |
1555 | find that function's saved context. */ | |
4ac74fb8 | 1556 | if (context != current_function_decl && context != inline_function_decl) |
6f086dfc RS |
1557 | for (function = outer_function_chain; function; function = function->next) |
1558 | if (function->decl == context) | |
1559 | break; | |
1560 | ||
6f086dfc RS |
1561 | /* If this is a variable-size object with a pseudo to address it, |
1562 | put that pseudo into the stack, if the var is nonlocal. */ | |
a82ad570 | 1563 | if (DECL_NONLOCAL (decl) |
6f086dfc RS |
1564 | && GET_CODE (reg) == MEM |
1565 | && GET_CODE (XEXP (reg, 0)) == REG | |
1566 | && REGNO (XEXP (reg, 0)) > LAST_VIRTUAL_REGISTER) | |
4cdb3e78 RS |
1567 | { |
1568 | reg = XEXP (reg, 0); | |
1569 | decl_mode = promoted_mode = GET_MODE (reg); | |
1570 | } | |
e15762df | 1571 | |
e9a25f70 JL |
1572 | can_use_addressof |
1573 | = (function == 0 | |
e5e809f4 | 1574 | && optimize > 0 |
e9a25f70 JL |
1575 | /* FIXME make it work for promoted modes too */ |
1576 | && decl_mode == promoted_mode | |
1577 | #ifdef NON_SAVING_SETJMP | |
1578 | && ! (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
1579 | #endif | |
1580 | ); | |
1581 | ||
1582 | /* If we can't use ADDRESSOF, make sure we see through one we already | |
1583 | generated. */ | |
1584 | if (! can_use_addressof && GET_CODE (reg) == MEM | |
1585 | && GET_CODE (XEXP (reg, 0)) == ADDRESSOF) | |
1586 | reg = XEXP (XEXP (reg, 0), 0); | |
1587 | ||
293e3de4 RS |
1588 | /* Now we should have a value that resides in one or more pseudo regs. */ |
1589 | ||
1590 | if (GET_CODE (reg) == REG) | |
e9a25f70 JL |
1591 | { |
1592 | /* If this variable lives in the current function and we don't need | |
1593 | to put things in the stack for the sake of setjmp, try to keep it | |
1594 | in a register until we know we actually need the address. */ | |
1595 | if (can_use_addressof) | |
1596 | gen_mem_addressof (reg, decl); | |
1597 | else | |
1598 | put_reg_into_stack (function, reg, TREE_TYPE (decl), | |
1599 | promoted_mode, decl_mode, | |
e5e809f4 | 1600 | TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1601 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1602 | 0); | |
e9a25f70 | 1603 | } |
293e3de4 RS |
1604 | else if (GET_CODE (reg) == CONCAT) |
1605 | { | |
1606 | /* A CONCAT contains two pseudos; put them both in the stack. | |
1607 | We do it so they end up consecutive. */ | |
1608 | enum machine_mode part_mode = GET_MODE (XEXP (reg, 0)); | |
1609 | tree part_type = TREE_TYPE (TREE_TYPE (decl)); | |
4738c10d | 1610 | #ifdef FRAME_GROWS_DOWNWARD |
293e3de4 | 1611 | /* Since part 0 should have a lower address, do it second. */ |
0006e95b | 1612 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 | 1613 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1614 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1615 | 0); | |
0006e95b | 1616 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 | 1617 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1618 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1619 | 0); | |
293e3de4 | 1620 | #else |
0006e95b | 1621 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 | 1622 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1623 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1624 | 0); | |
0006e95b | 1625 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 | 1626 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
fe9b4957 MM |
1627 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, |
1628 | 0); | |
293e3de4 RS |
1629 | #endif |
1630 | ||
1631 | /* Change the CONCAT into a combined MEM for both parts. */ | |
1632 | PUT_CODE (reg, MEM); | |
0006e95b | 1633 | MEM_VOLATILE_P (reg) = MEM_VOLATILE_P (XEXP (reg, 0)); |
41472af8 | 1634 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
0006e95b | 1635 | |
293e3de4 RS |
1636 | /* The two parts are in memory order already. |
1637 | Use the lower parts address as ours. */ | |
1638 | XEXP (reg, 0) = XEXP (XEXP (reg, 0), 0); | |
1639 | /* Prevent sharing of rtl that might lose. */ | |
1640 | if (GET_CODE (XEXP (reg, 0)) == PLUS) | |
1641 | XEXP (reg, 0) = copy_rtx (XEXP (reg, 0)); | |
1642 | } | |
86fa911a RK |
1643 | else |
1644 | return; | |
1645 | ||
7d384cc0 | 1646 | if (current_function_check_memory_usage) |
86fa911a RK |
1647 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, |
1648 | XEXP (reg, 0), ptr_mode, | |
1649 | GEN_INT (GET_MODE_SIZE (GET_MODE (reg))), | |
1650 | TYPE_MODE (sizetype), | |
956d6950 JL |
1651 | GEN_INT (MEMORY_USE_RW), |
1652 | TYPE_MODE (integer_type_node)); | |
293e3de4 RS |
1653 | } |
1654 | ||
1655 | /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG | |
1656 | into the stack frame of FUNCTION (0 means the current function). | |
1657 | DECL_MODE is the machine mode of the user-level data type. | |
0006e95b | 1658 | PROMOTED_MODE is the machine mode of the register. |
e5e809f4 JL |
1659 | VOLATILE_P is nonzero if this is for a "volatile" decl. |
1660 | USED_P is nonzero if this reg might have already been used in an insn. */ | |
293e3de4 RS |
1661 | |
1662 | static void | |
e9a25f70 | 1663 | put_reg_into_stack (function, reg, type, promoted_mode, decl_mode, volatile_p, |
fe9b4957 | 1664 | original_regno, used_p, ht) |
293e3de4 RS |
1665 | struct function *function; |
1666 | rtx reg; | |
1667 | tree type; | |
1668 | enum machine_mode promoted_mode, decl_mode; | |
0006e95b | 1669 | int volatile_p; |
e9a25f70 | 1670 | int original_regno; |
e5e809f4 | 1671 | int used_p; |
fe9b4957 | 1672 | struct hash_table *ht; |
293e3de4 RS |
1673 | { |
1674 | rtx new = 0; | |
e9a25f70 JL |
1675 | int regno = original_regno; |
1676 | ||
1677 | if (regno == 0) | |
1678 | regno = REGNO (reg); | |
6f086dfc RS |
1679 | |
1680 | if (function) | |
1681 | { | |
e9a25f70 JL |
1682 | if (regno < function->max_parm_reg) |
1683 | new = function->parm_reg_stack_loc[regno]; | |
6f086dfc | 1684 | if (new == 0) |
e15762df | 1685 | new = assign_outer_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), |
6f086dfc RS |
1686 | 0, function); |
1687 | } | |
1688 | else | |
1689 | { | |
e9a25f70 JL |
1690 | if (regno < max_parm_reg) |
1691 | new = parm_reg_stack_loc[regno]; | |
6f086dfc | 1692 | if (new == 0) |
e15762df | 1693 | new = assign_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), 0); |
6f086dfc RS |
1694 | } |
1695 | ||
0006e95b | 1696 | PUT_MODE (reg, decl_mode); |
6f086dfc RS |
1697 | XEXP (reg, 0) = XEXP (new, 0); |
1698 | /* `volatil' bit means one thing for MEMs, another entirely for REGs. */ | |
0006e95b | 1699 | MEM_VOLATILE_P (reg) = volatile_p; |
6f086dfc RS |
1700 | PUT_CODE (reg, MEM); |
1701 | ||
1702 | /* If this is a memory ref that contains aggregate components, | |
bdd3e6ab JW |
1703 | mark it as such for cse and loop optimize. If we are reusing a |
1704 | previously generated stack slot, then we need to copy the bit in | |
1705 | case it was set for other reasons. For instance, it is set for | |
1706 | __builtin_va_alist. */ | |
c6df88cb MM |
1707 | MEM_SET_IN_STRUCT_P (reg, |
1708 | AGGREGATE_TYPE_P (type) || MEM_IN_STRUCT_P (new)); | |
41472af8 | 1709 | MEM_ALIAS_SET (reg) = get_alias_set (type); |
6f086dfc RS |
1710 | |
1711 | /* Now make sure that all refs to the variable, previously made | |
1712 | when it was a register, are fixed up to be valid again. */ | |
e5e809f4 JL |
1713 | |
1714 | if (used_p && function != 0) | |
6f086dfc RS |
1715 | { |
1716 | struct var_refs_queue *temp; | |
1717 | ||
1718 | /* Variable is inherited; fix it up when we get back to its function. */ | |
1719 | push_obstacks (function->function_obstack, | |
1720 | function->function_maybepermanent_obstack); | |
4da73fa0 RK |
1721 | |
1722 | /* See comment in restore_tree_status in tree.c for why this needs to be | |
1723 | on saveable obstack. */ | |
6f086dfc | 1724 | temp |
4da73fa0 | 1725 | = (struct var_refs_queue *) savealloc (sizeof (struct var_refs_queue)); |
6f086dfc | 1726 | temp->modified = reg; |
00d8a4c1 | 1727 | temp->promoted_mode = promoted_mode; |
293e3de4 | 1728 | temp->unsignedp = TREE_UNSIGNED (type); |
6f086dfc RS |
1729 | temp->next = function->fixup_var_refs_queue; |
1730 | function->fixup_var_refs_queue = temp; | |
1731 | pop_obstacks (); | |
1732 | } | |
e5e809f4 | 1733 | else if (used_p) |
6f086dfc | 1734 | /* Variable is local; fix it up now. */ |
fe9b4957 | 1735 | fixup_var_refs (reg, promoted_mode, TREE_UNSIGNED (type), ht); |
6f086dfc RS |
1736 | } |
1737 | \f | |
1738 | static void | |
fe9b4957 | 1739 | fixup_var_refs (var, promoted_mode, unsignedp, ht) |
6f086dfc | 1740 | rtx var; |
00d8a4c1 RK |
1741 | enum machine_mode promoted_mode; |
1742 | int unsignedp; | |
fe9b4957 | 1743 | struct hash_table *ht; |
6f086dfc RS |
1744 | { |
1745 | tree pending; | |
1746 | rtx first_insn = get_insns (); | |
1747 | struct sequence_stack *stack = sequence_stack; | |
1748 | tree rtl_exps = rtl_expr_chain; | |
1749 | ||
1750 | /* Must scan all insns for stack-refs that exceed the limit. */ | |
fe9b4957 MM |
1751 | fixup_var_refs_insns (var, promoted_mode, unsignedp, first_insn, |
1752 | stack == 0, ht); | |
1753 | /* If there's a hash table, it must record all uses of VAR. */ | |
1754 | if (ht) | |
1755 | return; | |
6f086dfc RS |
1756 | |
1757 | /* Scan all pending sequences too. */ | |
1758 | for (; stack; stack = stack->next) | |
1759 | { | |
1760 | push_to_sequence (stack->first); | |
00d8a4c1 | 1761 | fixup_var_refs_insns (var, promoted_mode, unsignedp, |
fe9b4957 | 1762 | stack->first, stack->next != 0, 0); |
6f086dfc RS |
1763 | /* Update remembered end of sequence |
1764 | in case we added an insn at the end. */ | |
1765 | stack->last = get_last_insn (); | |
1766 | end_sequence (); | |
1767 | } | |
1768 | ||
1769 | /* Scan all waiting RTL_EXPRs too. */ | |
1770 | for (pending = rtl_exps; pending; pending = TREE_CHAIN (pending)) | |
1771 | { | |
1772 | rtx seq = RTL_EXPR_SEQUENCE (TREE_VALUE (pending)); | |
1773 | if (seq != const0_rtx && seq != 0) | |
1774 | { | |
1775 | push_to_sequence (seq); | |
fe9b4957 MM |
1776 | fixup_var_refs_insns (var, promoted_mode, unsignedp, seq, 0, |
1777 | 0); | |
6f086dfc RS |
1778 | end_sequence (); |
1779 | } | |
1780 | } | |
d33c2956 DB |
1781 | |
1782 | /* Scan the catch clauses for exception handling too. */ | |
1783 | push_to_sequence (catch_clauses); | |
fe9b4957 MM |
1784 | fixup_var_refs_insns (var, promoted_mode, unsignedp, catch_clauses, |
1785 | 0, 0); | |
d33c2956 | 1786 | end_sequence (); |
6f086dfc RS |
1787 | } |
1788 | \f | |
e15679f8 | 1789 | /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is |
6f086dfc | 1790 | some part of an insn. Return a struct fixup_replacement whose OLD |
0f41302f | 1791 | value is equal to X. Allocate a new structure if no such entry exists. */ |
6f086dfc RS |
1792 | |
1793 | static struct fixup_replacement * | |
2740a678 | 1794 | find_fixup_replacement (replacements, x) |
6f086dfc RS |
1795 | struct fixup_replacement **replacements; |
1796 | rtx x; | |
1797 | { | |
1798 | struct fixup_replacement *p; | |
1799 | ||
1800 | /* See if we have already replaced this. */ | |
1801 | for (p = *replacements; p && p->old != x; p = p->next) | |
1802 | ; | |
1803 | ||
1804 | if (p == 0) | |
1805 | { | |
1806 | p = (struct fixup_replacement *) oballoc (sizeof (struct fixup_replacement)); | |
1807 | p->old = x; | |
1808 | p->new = 0; | |
1809 | p->next = *replacements; | |
1810 | *replacements = p; | |
1811 | } | |
1812 | ||
1813 | return p; | |
1814 | } | |
1815 | ||
1816 | /* Scan the insn-chain starting with INSN for refs to VAR | |
1817 | and fix them up. TOPLEVEL is nonzero if this chain is the | |
1818 | main chain of insns for the current function. */ | |
1819 | ||
1820 | static void | |
fe9b4957 | 1821 | fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel, ht) |
6f086dfc | 1822 | rtx var; |
00d8a4c1 RK |
1823 | enum machine_mode promoted_mode; |
1824 | int unsignedp; | |
6f086dfc RS |
1825 | rtx insn; |
1826 | int toplevel; | |
fe9b4957 | 1827 | struct hash_table *ht; |
6f086dfc | 1828 | { |
02a10449 | 1829 | rtx call_dest = 0; |
fe9b4957 MM |
1830 | rtx insn_list; |
1831 | ||
1832 | /* If we already know which INSNs reference VAR there's no need | |
1833 | to walk the entire instruction chain. */ | |
1834 | if (ht) | |
1835 | { | |
1836 | insn_list = ((struct insns_for_mem_entry *) | |
1837 | hash_lookup (ht, var, /*create=*/0, /*copy=*/0))->insns; | |
1838 | insn = insn_list ? XEXP (insn_list, 0) : NULL_RTX; | |
1839 | insn_list = XEXP (insn_list, 1); | |
1840 | } | |
02a10449 | 1841 | |
6f086dfc RS |
1842 | while (insn) |
1843 | { | |
1844 | rtx next = NEXT_INSN (insn); | |
e5e809f4 | 1845 | rtx set, prev, prev_set; |
6f086dfc | 1846 | rtx note; |
e5e809f4 | 1847 | |
e15762df | 1848 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') |
6f086dfc | 1849 | { |
63770d6a RK |
1850 | /* If this is a CLOBBER of VAR, delete it. |
1851 | ||
1852 | If it has a REG_LIBCALL note, delete the REG_LIBCALL | |
1853 | and REG_RETVAL notes too. */ | |
926d1ca5 | 1854 | if (GET_CODE (PATTERN (insn)) == CLOBBER |
07362cb3 JW |
1855 | && (XEXP (PATTERN (insn), 0) == var |
1856 | || (GET_CODE (XEXP (PATTERN (insn), 0)) == CONCAT | |
1857 | && (XEXP (XEXP (PATTERN (insn), 0), 0) == var | |
1858 | || XEXP (XEXP (PATTERN (insn), 0), 1) == var)))) | |
63770d6a RK |
1859 | { |
1860 | if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0) | |
1861 | /* The REG_LIBCALL note will go away since we are going to | |
1862 | turn INSN into a NOTE, so just delete the | |
1863 | corresponding REG_RETVAL note. */ | |
1864 | remove_note (XEXP (note, 0), | |
1865 | find_reg_note (XEXP (note, 0), REG_RETVAL, | |
1866 | NULL_RTX)); | |
1867 | ||
1868 | /* In unoptimized compilation, we shouldn't call delete_insn | |
1869 | except in jump.c doing warnings. */ | |
1870 | PUT_CODE (insn, NOTE); | |
1871 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1872 | NOTE_SOURCE_FILE (insn) = 0; | |
1873 | } | |
1874 | ||
6f086dfc | 1875 | /* The insn to load VAR from a home in the arglist |
e5e809f4 JL |
1876 | is now a no-op. When we see it, just delete it. |
1877 | Similarly if this is storing VAR from a register from which | |
1878 | it was loaded in the previous insn. This will occur | |
1879 | when an ADDRESSOF was made for an arglist slot. */ | |
63770d6a | 1880 | else if (toplevel |
e5e809f4 JL |
1881 | && (set = single_set (insn)) != 0 |
1882 | && SET_DEST (set) == var | |
63770d6a RK |
1883 | /* If this represents the result of an insn group, |
1884 | don't delete the insn. */ | |
1885 | && find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0 | |
e5e809f4 JL |
1886 | && (rtx_equal_p (SET_SRC (set), var) |
1887 | || (GET_CODE (SET_SRC (set)) == REG | |
1888 | && (prev = prev_nonnote_insn (insn)) != 0 | |
1889 | && (prev_set = single_set (prev)) != 0 | |
1890 | && SET_DEST (prev_set) == SET_SRC (set) | |
1891 | && rtx_equal_p (SET_SRC (prev_set), var)))) | |
6f086dfc | 1892 | { |
b4ff474c RS |
1893 | /* In unoptimized compilation, we shouldn't call delete_insn |
1894 | except in jump.c doing warnings. */ | |
1895 | PUT_CODE (insn, NOTE); | |
1896 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1897 | NOTE_SOURCE_FILE (insn) = 0; | |
6f086dfc RS |
1898 | if (insn == last_parm_insn) |
1899 | last_parm_insn = PREV_INSN (next); | |
1900 | } | |
1901 | else | |
1902 | { | |
02a10449 RK |
1903 | struct fixup_replacement *replacements = 0; |
1904 | rtx next_insn = NEXT_INSN (insn); | |
1905 | ||
e9a25f70 JL |
1906 | if (SMALL_REGISTER_CLASSES) |
1907 | { | |
1908 | /* If the insn that copies the results of a CALL_INSN | |
1909 | into a pseudo now references VAR, we have to use an | |
1910 | intermediate pseudo since we want the life of the | |
1911 | return value register to be only a single insn. | |
02a10449 | 1912 | |
e9a25f70 JL |
1913 | If we don't use an intermediate pseudo, such things as |
1914 | address computations to make the address of VAR valid | |
1915 | if it is not can be placed between the CALL_INSN and INSN. | |
02a10449 | 1916 | |
e9a25f70 JL |
1917 | To make sure this doesn't happen, we record the destination |
1918 | of the CALL_INSN and see if the next insn uses both that | |
1919 | and VAR. */ | |
02a10449 | 1920 | |
f95182a4 ILT |
1921 | if (call_dest != 0 && GET_CODE (insn) == INSN |
1922 | && reg_mentioned_p (var, PATTERN (insn)) | |
1923 | && reg_mentioned_p (call_dest, PATTERN (insn))) | |
1924 | { | |
1925 | rtx temp = gen_reg_rtx (GET_MODE (call_dest)); | |
02a10449 | 1926 | |
f95182a4 | 1927 | emit_insn_before (gen_move_insn (temp, call_dest), insn); |
02a10449 | 1928 | |
f95182a4 ILT |
1929 | PATTERN (insn) = replace_rtx (PATTERN (insn), |
1930 | call_dest, temp); | |
1931 | } | |
02a10449 | 1932 | |
f95182a4 ILT |
1933 | if (GET_CODE (insn) == CALL_INSN |
1934 | && GET_CODE (PATTERN (insn)) == SET) | |
1935 | call_dest = SET_DEST (PATTERN (insn)); | |
1936 | else if (GET_CODE (insn) == CALL_INSN | |
1937 | && GET_CODE (PATTERN (insn)) == PARALLEL | |
1938 | && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET) | |
1939 | call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0)); | |
1940 | else | |
1941 | call_dest = 0; | |
1942 | } | |
02a10449 | 1943 | |
6f086dfc RS |
1944 | /* See if we have to do anything to INSN now that VAR is in |
1945 | memory. If it needs to be loaded into a pseudo, use a single | |
1946 | pseudo for the entire insn in case there is a MATCH_DUP | |
1947 | between two operands. We pass a pointer to the head of | |
1948 | a list of struct fixup_replacements. If fixup_var_refs_1 | |
1949 | needs to allocate pseudos or replacement MEMs (for SUBREGs), | |
1950 | it will record them in this list. | |
1951 | ||
1952 | If it allocated a pseudo for any replacement, we copy into | |
1953 | it here. */ | |
1954 | ||
00d8a4c1 RK |
1955 | fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn, |
1956 | &replacements); | |
6f086dfc | 1957 | |
77121fee JW |
1958 | /* If this is last_parm_insn, and any instructions were output |
1959 | after it to fix it up, then we must set last_parm_insn to | |
1960 | the last such instruction emitted. */ | |
1961 | if (insn == last_parm_insn) | |
1962 | last_parm_insn = PREV_INSN (next_insn); | |
1963 | ||
6f086dfc RS |
1964 | while (replacements) |
1965 | { | |
1966 | if (GET_CODE (replacements->new) == REG) | |
1967 | { | |
1968 | rtx insert_before; | |
00d8a4c1 | 1969 | rtx seq; |
6f086dfc RS |
1970 | |
1971 | /* OLD might be a (subreg (mem)). */ | |
1972 | if (GET_CODE (replacements->old) == SUBREG) | |
1973 | replacements->old | |
1974 | = fixup_memory_subreg (replacements->old, insn, 0); | |
1975 | else | |
1976 | replacements->old | |
1977 | = fixup_stack_1 (replacements->old, insn); | |
1978 | ||
5fa7422b | 1979 | insert_before = insn; |
6f086dfc | 1980 | |
00d8a4c1 RK |
1981 | /* If we are changing the mode, do a conversion. |
1982 | This might be wasteful, but combine.c will | |
1983 | eliminate much of the waste. */ | |
1984 | ||
1985 | if (GET_MODE (replacements->new) | |
1986 | != GET_MODE (replacements->old)) | |
1987 | { | |
1988 | start_sequence (); | |
1989 | convert_move (replacements->new, | |
1990 | replacements->old, unsignedp); | |
1991 | seq = gen_sequence (); | |
1992 | end_sequence (); | |
1993 | } | |
1994 | else | |
1995 | seq = gen_move_insn (replacements->new, | |
1996 | replacements->old); | |
1997 | ||
1998 | emit_insn_before (seq, insert_before); | |
6f086dfc RS |
1999 | } |
2000 | ||
2001 | replacements = replacements->next; | |
2002 | } | |
2003 | } | |
2004 | ||
2005 | /* Also fix up any invalid exprs in the REG_NOTES of this insn. | |
2006 | But don't touch other insns referred to by reg-notes; | |
2007 | we will get them elsewhere. */ | |
2008 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
2009 | if (GET_CODE (note) != INSN_LIST) | |
ab6155b7 RK |
2010 | XEXP (note, 0) |
2011 | = walk_fixup_memory_subreg (XEXP (note, 0), insn, 1); | |
6f086dfc | 2012 | } |
fe9b4957 MM |
2013 | |
2014 | if (!ht) | |
2015 | insn = next; | |
2016 | else if (insn_list) | |
2017 | { | |
2018 | insn = XEXP (insn_list, 0); | |
2019 | insn_list = XEXP (insn_list, 1); | |
2020 | } | |
2021 | else | |
2022 | insn = NULL_RTX; | |
6f086dfc RS |
2023 | } |
2024 | } | |
2025 | \f | |
00d8a4c1 RK |
2026 | /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE. |
2027 | See if the rtx expression at *LOC in INSN needs to be changed. | |
6f086dfc RS |
2028 | |
2029 | REPLACEMENTS is a pointer to a list head that starts out zero, but may | |
2030 | contain a list of original rtx's and replacements. If we find that we need | |
2031 | to modify this insn by replacing a memory reference with a pseudo or by | |
2032 | making a new MEM to implement a SUBREG, we consult that list to see if | |
2033 | we have already chosen a replacement. If none has already been allocated, | |
2034 | we allocate it and update the list. fixup_var_refs_insns will copy VAR | |
2035 | or the SUBREG, as appropriate, to the pseudo. */ | |
2036 | ||
2037 | static void | |
00d8a4c1 | 2038 | fixup_var_refs_1 (var, promoted_mode, loc, insn, replacements) |
6f086dfc | 2039 | register rtx var; |
00d8a4c1 | 2040 | enum machine_mode promoted_mode; |
6f086dfc RS |
2041 | register rtx *loc; |
2042 | rtx insn; | |
2043 | struct fixup_replacement **replacements; | |
2044 | { | |
2045 | register int i; | |
2046 | register rtx x = *loc; | |
2047 | RTX_CODE code = GET_CODE (x); | |
2048 | register char *fmt; | |
2049 | register rtx tem, tem1; | |
2050 | struct fixup_replacement *replacement; | |
2051 | ||
2052 | switch (code) | |
2053 | { | |
e9a25f70 JL |
2054 | case ADDRESSOF: |
2055 | if (XEXP (x, 0) == var) | |
2056 | { | |
956d6950 JL |
2057 | /* Prevent sharing of rtl that might lose. */ |
2058 | rtx sub = copy_rtx (XEXP (var, 0)); | |
2059 | ||
956d6950 JL |
2060 | if (! validate_change (insn, loc, sub, 0)) |
2061 | { | |
5f98f7c4 RH |
2062 | rtx y = gen_reg_rtx (GET_MODE (sub)); |
2063 | rtx seq, new_insn; | |
2064 | ||
2065 | /* We should be able to replace with a register or all is lost. | |
2066 | Note that we can't use validate_change to verify this, since | |
2067 | we're not caring for replacing all dups simultaneously. */ | |
2068 | if (! validate_replace_rtx (*loc, y, insn)) | |
2069 | abort (); | |
2070 | ||
2071 | /* Careful! First try to recognize a direct move of the | |
2072 | value, mimicking how things are done in gen_reload wrt | |
2073 | PLUS. Consider what happens when insn is a conditional | |
2074 | move instruction and addsi3 clobbers flags. */ | |
2075 | ||
2076 | start_sequence (); | |
2077 | new_insn = emit_insn (gen_rtx_SET (VOIDmode, y, sub)); | |
2078 | seq = gen_sequence (); | |
2079 | end_sequence (); | |
2080 | ||
2081 | if (recog_memoized (new_insn) < 0) | |
2082 | { | |
2083 | /* That failed. Fall back on force_operand and hope. */ | |
956d6950 | 2084 | |
5f98f7c4 RH |
2085 | start_sequence (); |
2086 | force_operand (sub, y); | |
2087 | seq = gen_sequence (); | |
2088 | end_sequence (); | |
2089 | } | |
956d6950 | 2090 | |
5f98f7c4 RH |
2091 | #ifdef HAVE_cc0 |
2092 | /* Don't separate setter from user. */ | |
2093 | if (PREV_INSN (insn) && sets_cc0_p (PREV_INSN (insn))) | |
2094 | insn = PREV_INSN (insn); | |
2095 | #endif | |
2096 | ||
2097 | emit_insn_before (seq, insn); | |
2098 | } | |
e9a25f70 JL |
2099 | } |
2100 | return; | |
2101 | ||
6f086dfc RS |
2102 | case MEM: |
2103 | if (var == x) | |
2104 | { | |
2105 | /* If we already have a replacement, use it. Otherwise, | |
2106 | try to fix up this address in case it is invalid. */ | |
2107 | ||
2740a678 | 2108 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
2109 | if (replacement->new) |
2110 | { | |
2111 | *loc = replacement->new; | |
2112 | return; | |
2113 | } | |
2114 | ||
2115 | *loc = replacement->new = x = fixup_stack_1 (x, insn); | |
2116 | ||
00d8a4c1 RK |
2117 | /* Unless we are forcing memory to register or we changed the mode, |
2118 | we can leave things the way they are if the insn is valid. */ | |
6f086dfc RS |
2119 | |
2120 | INSN_CODE (insn) = -1; | |
00d8a4c1 RK |
2121 | if (! flag_force_mem && GET_MODE (x) == promoted_mode |
2122 | && recog_memoized (insn) >= 0) | |
6f086dfc RS |
2123 | return; |
2124 | ||
00d8a4c1 | 2125 | *loc = replacement->new = gen_reg_rtx (promoted_mode); |
6f086dfc RS |
2126 | return; |
2127 | } | |
2128 | ||
2129 | /* If X contains VAR, we need to unshare it here so that we update | |
2130 | each occurrence separately. But all identical MEMs in one insn | |
2131 | must be replaced with the same rtx because of the possibility of | |
2132 | MATCH_DUPs. */ | |
2133 | ||
2134 | if (reg_mentioned_p (var, x)) | |
2135 | { | |
2740a678 | 2136 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
2137 | if (replacement->new == 0) |
2138 | replacement->new = copy_most_rtx (x, var); | |
2139 | ||
2140 | *loc = x = replacement->new; | |
2141 | } | |
2142 | break; | |
2143 | ||
2144 | case REG: | |
2145 | case CC0: | |
2146 | case PC: | |
2147 | case CONST_INT: | |
2148 | case CONST: | |
2149 | case SYMBOL_REF: | |
2150 | case LABEL_REF: | |
2151 | case CONST_DOUBLE: | |
2152 | return; | |
2153 | ||
2154 | case SIGN_EXTRACT: | |
2155 | case ZERO_EXTRACT: | |
2156 | /* Note that in some cases those types of expressions are altered | |
2157 | by optimize_bit_field, and do not survive to get here. */ | |
2158 | if (XEXP (x, 0) == var | |
2159 | || (GET_CODE (XEXP (x, 0)) == SUBREG | |
2160 | && SUBREG_REG (XEXP (x, 0)) == var)) | |
2161 | { | |
2162 | /* Get TEM as a valid MEM in the mode presently in the insn. | |
2163 | ||
2164 | We don't worry about the possibility of MATCH_DUP here; it | |
2165 | is highly unlikely and would be tricky to handle. */ | |
2166 | ||
2167 | tem = XEXP (x, 0); | |
2168 | if (GET_CODE (tem) == SUBREG) | |
0e09cc26 RK |
2169 | { |
2170 | if (GET_MODE_BITSIZE (GET_MODE (tem)) | |
2171 | > GET_MODE_BITSIZE (GET_MODE (var))) | |
2172 | { | |
2173 | replacement = find_fixup_replacement (replacements, var); | |
2174 | if (replacement->new == 0) | |
2175 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2176 | SUBREG_REG (tem) = replacement->new; | |
2177 | } | |
ef933d26 RK |
2178 | else |
2179 | tem = fixup_memory_subreg (tem, insn, 0); | |
0e09cc26 RK |
2180 | } |
2181 | else | |
2182 | tem = fixup_stack_1 (tem, insn); | |
6f086dfc RS |
2183 | |
2184 | /* Unless we want to load from memory, get TEM into the proper mode | |
2185 | for an extract from memory. This can only be done if the | |
2186 | extract is at a constant position and length. */ | |
2187 | ||
2188 | if (! flag_force_mem && GET_CODE (XEXP (x, 1)) == CONST_INT | |
2189 | && GET_CODE (XEXP (x, 2)) == CONST_INT | |
2190 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2191 | && ! MEM_VOLATILE_P (tem)) | |
2192 | { | |
2193 | enum machine_mode wanted_mode = VOIDmode; | |
2194 | enum machine_mode is_mode = GET_MODE (tem); | |
e5e809f4 | 2195 | HOST_WIDE_INT pos = INTVAL (XEXP (x, 2)); |
6f086dfc RS |
2196 | |
2197 | #ifdef HAVE_extzv | |
2198 | if (GET_CODE (x) == ZERO_EXTRACT) | |
0d8e55d8 JL |
2199 | { |
2200 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extzv][1]; | |
2201 | if (wanted_mode == VOIDmode) | |
2202 | wanted_mode = word_mode; | |
2203 | } | |
6f086dfc RS |
2204 | #endif |
2205 | #ifdef HAVE_extv | |
2206 | if (GET_CODE (x) == SIGN_EXTRACT) | |
0d8e55d8 JL |
2207 | { |
2208 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extv][1]; | |
2209 | if (wanted_mode == VOIDmode) | |
2210 | wanted_mode = word_mode; | |
2211 | } | |
6f086dfc | 2212 | #endif |
6dc42e49 | 2213 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2214 | if (wanted_mode != VOIDmode |
2215 | && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) | |
2216 | { | |
e5e809f4 | 2217 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2218 | rtx old_pos = XEXP (x, 2); |
2219 | rtx newmem; | |
2220 | ||
2221 | /* If the bytes and bits are counted differently, we | |
2222 | must adjust the offset. */ | |
f76b9db2 ILT |
2223 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2224 | offset = (GET_MODE_SIZE (is_mode) | |
2225 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2226 | |
2227 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2228 | ||
38a448ca RH |
2229 | newmem = gen_rtx_MEM (wanted_mode, |
2230 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc | 2231 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
c6df88cb | 2232 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
2233 | |
2234 | /* Make the change and see if the insn remains valid. */ | |
2235 | INSN_CODE (insn) = -1; | |
2236 | XEXP (x, 0) = newmem; | |
5f4f0e22 | 2237 | XEXP (x, 2) = GEN_INT (pos); |
6f086dfc RS |
2238 | |
2239 | if (recog_memoized (insn) >= 0) | |
2240 | return; | |
2241 | ||
2242 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2243 | restored later. */ | |
2244 | XEXP (x, 2) = old_pos; | |
2245 | } | |
2246 | } | |
2247 | ||
2248 | /* If we get here, the bitfield extract insn can't accept a memory | |
2249 | reference. Copy the input into a register. */ | |
2250 | ||
2251 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2252 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2253 | XEXP (x, 0) = tem1; | |
2254 | return; | |
2255 | } | |
2256 | break; | |
2257 | ||
2258 | case SUBREG: | |
2259 | if (SUBREG_REG (x) == var) | |
2260 | { | |
00d8a4c1 RK |
2261 | /* If this is a special SUBREG made because VAR was promoted |
2262 | from a wider mode, replace it with VAR and call ourself | |
2263 | recursively, this time saying that the object previously | |
2264 | had its current mode (by virtue of the SUBREG). */ | |
2265 | ||
2266 | if (SUBREG_PROMOTED_VAR_P (x)) | |
2267 | { | |
2268 | *loc = var; | |
2269 | fixup_var_refs_1 (var, GET_MODE (var), loc, insn, replacements); | |
2270 | return; | |
2271 | } | |
2272 | ||
6f086dfc RS |
2273 | /* If this SUBREG makes VAR wider, it has become a paradoxical |
2274 | SUBREG with VAR in memory, but these aren't allowed at this | |
2275 | stage of the compilation. So load VAR into a pseudo and take | |
2276 | a SUBREG of that pseudo. */ | |
2277 | if (GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (var))) | |
2278 | { | |
2740a678 | 2279 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
2280 | if (replacement->new == 0) |
2281 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2282 | SUBREG_REG (x) = replacement->new; | |
2283 | return; | |
2284 | } | |
2285 | ||
2286 | /* See if we have already found a replacement for this SUBREG. | |
2287 | If so, use it. Otherwise, make a MEM and see if the insn | |
2288 | is recognized. If not, or if we should force MEM into a register, | |
2289 | make a pseudo for this SUBREG. */ | |
2740a678 | 2290 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
2291 | if (replacement->new) |
2292 | { | |
2293 | *loc = replacement->new; | |
2294 | return; | |
2295 | } | |
2296 | ||
2297 | replacement->new = *loc = fixup_memory_subreg (x, insn, 0); | |
2298 | ||
f898f031 | 2299 | INSN_CODE (insn) = -1; |
6f086dfc RS |
2300 | if (! flag_force_mem && recog_memoized (insn) >= 0) |
2301 | return; | |
2302 | ||
2303 | *loc = replacement->new = gen_reg_rtx (GET_MODE (x)); | |
2304 | return; | |
2305 | } | |
2306 | break; | |
2307 | ||
2308 | case SET: | |
2309 | /* First do special simplification of bit-field references. */ | |
2310 | if (GET_CODE (SET_DEST (x)) == SIGN_EXTRACT | |
2311 | || GET_CODE (SET_DEST (x)) == ZERO_EXTRACT) | |
2312 | optimize_bit_field (x, insn, 0); | |
2313 | if (GET_CODE (SET_SRC (x)) == SIGN_EXTRACT | |
2314 | || GET_CODE (SET_SRC (x)) == ZERO_EXTRACT) | |
5f4f0e22 | 2315 | optimize_bit_field (x, insn, NULL_PTR); |
6f086dfc | 2316 | |
0e09cc26 RK |
2317 | /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object |
2318 | into a register and then store it back out. */ | |
2319 | if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT | |
2320 | && GET_CODE (XEXP (SET_DEST (x), 0)) == SUBREG | |
2321 | && SUBREG_REG (XEXP (SET_DEST (x), 0)) == var | |
2322 | && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x), 0))) | |
2323 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2324 | { | |
2325 | replacement = find_fixup_replacement (replacements, var); | |
2326 | if (replacement->new == 0) | |
2327 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2328 | ||
2329 | SUBREG_REG (XEXP (SET_DEST (x), 0)) = replacement->new; | |
2330 | emit_insn_after (gen_move_insn (var, replacement->new), insn); | |
2331 | } | |
2332 | ||
6f086dfc | 2333 | /* If SET_DEST is now a paradoxical SUBREG, put the result of this |
0f41302f | 2334 | insn into a pseudo and store the low part of the pseudo into VAR. */ |
6f086dfc RS |
2335 | if (GET_CODE (SET_DEST (x)) == SUBREG |
2336 | && SUBREG_REG (SET_DEST (x)) == var | |
2337 | && (GET_MODE_SIZE (GET_MODE (SET_DEST (x))) | |
2338 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2339 | { | |
2340 | SET_DEST (x) = tem = gen_reg_rtx (GET_MODE (SET_DEST (x))); | |
2341 | emit_insn_after (gen_move_insn (var, gen_lowpart (GET_MODE (var), | |
2342 | tem)), | |
2343 | insn); | |
2344 | break; | |
2345 | } | |
2346 | ||
2347 | { | |
2348 | rtx dest = SET_DEST (x); | |
2349 | rtx src = SET_SRC (x); | |
29a82058 | 2350 | #ifdef HAVE_insv |
6f086dfc | 2351 | rtx outerdest = dest; |
29a82058 | 2352 | #endif |
6f086dfc RS |
2353 | |
2354 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART | |
2355 | || GET_CODE (dest) == SIGN_EXTRACT | |
2356 | || GET_CODE (dest) == ZERO_EXTRACT) | |
2357 | dest = XEXP (dest, 0); | |
2358 | ||
2359 | if (GET_CODE (src) == SUBREG) | |
2360 | src = XEXP (src, 0); | |
2361 | ||
2362 | /* If VAR does not appear at the top level of the SET | |
2363 | just scan the lower levels of the tree. */ | |
2364 | ||
2365 | if (src != var && dest != var) | |
2366 | break; | |
2367 | ||
2368 | /* We will need to rerecognize this insn. */ | |
2369 | INSN_CODE (insn) = -1; | |
2370 | ||
2371 | #ifdef HAVE_insv | |
2372 | if (GET_CODE (outerdest) == ZERO_EXTRACT && dest == var) | |
2373 | { | |
2374 | /* Since this case will return, ensure we fixup all the | |
2375 | operands here. */ | |
00d8a4c1 RK |
2376 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 1), |
2377 | insn, replacements); | |
2378 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 2), | |
2379 | insn, replacements); | |
2380 | fixup_var_refs_1 (var, promoted_mode, &SET_SRC (x), | |
2381 | insn, replacements); | |
6f086dfc RS |
2382 | |
2383 | tem = XEXP (outerdest, 0); | |
2384 | ||
2385 | /* Clean up (SUBREG:SI (MEM:mode ...) 0) | |
2386 | that may appear inside a ZERO_EXTRACT. | |
2387 | This was legitimate when the MEM was a REG. */ | |
2388 | if (GET_CODE (tem) == SUBREG | |
2389 | && SUBREG_REG (tem) == var) | |
0e09cc26 | 2390 | tem = fixup_memory_subreg (tem, insn, 0); |
6f086dfc RS |
2391 | else |
2392 | tem = fixup_stack_1 (tem, insn); | |
2393 | ||
2394 | if (GET_CODE (XEXP (outerdest, 1)) == CONST_INT | |
2395 | && GET_CODE (XEXP (outerdest, 2)) == CONST_INT | |
2396 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2397 | && ! MEM_VOLATILE_P (tem)) | |
2398 | { | |
0d8e55d8 | 2399 | enum machine_mode wanted_mode; |
6f086dfc | 2400 | enum machine_mode is_mode = GET_MODE (tem); |
e5e809f4 | 2401 | HOST_WIDE_INT pos = INTVAL (XEXP (outerdest, 2)); |
6f086dfc | 2402 | |
0d8e55d8 JL |
2403 | wanted_mode = insn_operand_mode[(int) CODE_FOR_insv][0]; |
2404 | if (wanted_mode == VOIDmode) | |
2405 | wanted_mode = word_mode; | |
2406 | ||
6dc42e49 | 2407 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2408 | if (GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) |
2409 | { | |
e5e809f4 | 2410 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2411 | rtx old_pos = XEXP (outerdest, 2); |
2412 | rtx newmem; | |
2413 | ||
f76b9db2 ILT |
2414 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2415 | offset = (GET_MODE_SIZE (is_mode) | |
2416 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2417 | |
2418 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2419 | ||
38a448ca RH |
2420 | newmem = gen_rtx_MEM (wanted_mode, |
2421 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc | 2422 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
c6df88cb | 2423 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
2424 | |
2425 | /* Make the change and see if the insn remains valid. */ | |
2426 | INSN_CODE (insn) = -1; | |
2427 | XEXP (outerdest, 0) = newmem; | |
5f4f0e22 | 2428 | XEXP (outerdest, 2) = GEN_INT (pos); |
6f086dfc RS |
2429 | |
2430 | if (recog_memoized (insn) >= 0) | |
2431 | return; | |
2432 | ||
2433 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2434 | restored later. */ | |
2435 | XEXP (outerdest, 2) = old_pos; | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | /* If we get here, the bit-field store doesn't allow memory | |
2440 | or isn't located at a constant position. Load the value into | |
2441 | a register, do the store, and put it back into memory. */ | |
2442 | ||
2443 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2444 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2445 | emit_insn_after (gen_move_insn (tem, tem1), insn); | |
2446 | XEXP (outerdest, 0) = tem1; | |
2447 | return; | |
2448 | } | |
2449 | #endif | |
2450 | ||
2451 | /* STRICT_LOW_PART is a no-op on memory references | |
2452 | and it can cause combinations to be unrecognizable, | |
2453 | so eliminate it. */ | |
2454 | ||
2455 | if (dest == var && GET_CODE (SET_DEST (x)) == STRICT_LOW_PART) | |
2456 | SET_DEST (x) = XEXP (SET_DEST (x), 0); | |
2457 | ||
2458 | /* A valid insn to copy VAR into or out of a register | |
2459 | must be left alone, to avoid an infinite loop here. | |
2460 | If the reference to VAR is by a subreg, fix that up, | |
2461 | since SUBREG is not valid for a memref. | |
e15762df RK |
2462 | Also fix up the address of the stack slot. |
2463 | ||
2464 | Note that we must not try to recognize the insn until | |
2465 | after we know that we have valid addresses and no | |
2466 | (subreg (mem ...) ...) constructs, since these interfere | |
2467 | with determining the validity of the insn. */ | |
6f086dfc RS |
2468 | |
2469 | if ((SET_SRC (x) == var | |
2470 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2471 | && SUBREG_REG (SET_SRC (x)) == var)) | |
2472 | && (GET_CODE (SET_DEST (x)) == REG | |
2473 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2474 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG)) | |
1d273bf5 | 2475 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2476 | && x == single_set (insn)) |
6f086dfc | 2477 | { |
e15762df RK |
2478 | rtx pat; |
2479 | ||
2740a678 | 2480 | replacement = find_fixup_replacement (replacements, SET_SRC (x)); |
6f086dfc | 2481 | if (replacement->new) |
6f086dfc | 2482 | SET_SRC (x) = replacement->new; |
6f086dfc RS |
2483 | else if (GET_CODE (SET_SRC (x)) == SUBREG) |
2484 | SET_SRC (x) = replacement->new | |
2485 | = fixup_memory_subreg (SET_SRC (x), insn, 0); | |
2486 | else | |
2487 | SET_SRC (x) = replacement->new | |
2488 | = fixup_stack_1 (SET_SRC (x), insn); | |
e15762df RK |
2489 | |
2490 | if (recog_memoized (insn) >= 0) | |
2491 | return; | |
2492 | ||
2493 | /* INSN is not valid, but we know that we want to | |
2494 | copy SET_SRC (x) to SET_DEST (x) in some way. So | |
2495 | we generate the move and see whether it requires more | |
2496 | than one insn. If it does, we emit those insns and | |
2497 | delete INSN. Otherwise, we an just replace the pattern | |
2498 | of INSN; we have already verified above that INSN has | |
2499 | no other function that to do X. */ | |
2500 | ||
2501 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2502 | if (GET_CODE (pat) == SEQUENCE) | |
2503 | { | |
2504 | emit_insn_after (pat, insn); | |
2505 | PUT_CODE (insn, NOTE); | |
2506 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2507 | NOTE_SOURCE_FILE (insn) = 0; | |
2508 | } | |
2509 | else | |
2510 | PATTERN (insn) = pat; | |
2511 | ||
6f086dfc RS |
2512 | return; |
2513 | } | |
2514 | ||
2515 | if ((SET_DEST (x) == var | |
2516 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2517 | && SUBREG_REG (SET_DEST (x)) == var)) | |
2518 | && (GET_CODE (SET_SRC (x)) == REG | |
2519 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2520 | && GET_CODE (SUBREG_REG (SET_SRC (x))) == REG)) | |
1d273bf5 | 2521 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2522 | && x == single_set (insn)) |
6f086dfc | 2523 | { |
e15762df RK |
2524 | rtx pat; |
2525 | ||
6f086dfc RS |
2526 | if (GET_CODE (SET_DEST (x)) == SUBREG) |
2527 | SET_DEST (x) = fixup_memory_subreg (SET_DEST (x), insn, 0); | |
2528 | else | |
2529 | SET_DEST (x) = fixup_stack_1 (SET_DEST (x), insn); | |
e15762df RK |
2530 | |
2531 | if (recog_memoized (insn) >= 0) | |
2532 | return; | |
2533 | ||
2534 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2535 | if (GET_CODE (pat) == SEQUENCE) | |
2536 | { | |
2537 | emit_insn_after (pat, insn); | |
2538 | PUT_CODE (insn, NOTE); | |
2539 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2540 | NOTE_SOURCE_FILE (insn) = 0; | |
2541 | } | |
2542 | else | |
2543 | PATTERN (insn) = pat; | |
2544 | ||
6f086dfc RS |
2545 | return; |
2546 | } | |
2547 | ||
2548 | /* Otherwise, storing into VAR must be handled specially | |
2549 | by storing into a temporary and copying that into VAR | |
00d8a4c1 RK |
2550 | with a new insn after this one. Note that this case |
2551 | will be used when storing into a promoted scalar since | |
2552 | the insn will now have different modes on the input | |
2553 | and output and hence will be invalid (except for the case | |
2554 | of setting it to a constant, which does not need any | |
2555 | change if it is valid). We generate extra code in that case, | |
2556 | but combine.c will eliminate it. */ | |
6f086dfc RS |
2557 | |
2558 | if (dest == var) | |
2559 | { | |
2560 | rtx temp; | |
00d8a4c1 RK |
2561 | rtx fixeddest = SET_DEST (x); |
2562 | ||
6f086dfc | 2563 | /* STRICT_LOW_PART can be discarded, around a MEM. */ |
00d8a4c1 RK |
2564 | if (GET_CODE (fixeddest) == STRICT_LOW_PART) |
2565 | fixeddest = XEXP (fixeddest, 0); | |
6f086dfc | 2566 | /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */ |
00d8a4c1 | 2567 | if (GET_CODE (fixeddest) == SUBREG) |
926d1ca5 RK |
2568 | { |
2569 | fixeddest = fixup_memory_subreg (fixeddest, insn, 0); | |
2570 | promoted_mode = GET_MODE (fixeddest); | |
2571 | } | |
6f086dfc | 2572 | else |
00d8a4c1 RK |
2573 | fixeddest = fixup_stack_1 (fixeddest, insn); |
2574 | ||
926d1ca5 | 2575 | temp = gen_reg_rtx (promoted_mode); |
00d8a4c1 RK |
2576 | |
2577 | emit_insn_after (gen_move_insn (fixeddest, | |
2578 | gen_lowpart (GET_MODE (fixeddest), | |
2579 | temp)), | |
2580 | insn); | |
6f086dfc | 2581 | |
6f086dfc RS |
2582 | SET_DEST (x) = temp; |
2583 | } | |
2584 | } | |
e9a25f70 JL |
2585 | |
2586 | default: | |
2587 | break; | |
6f086dfc RS |
2588 | } |
2589 | ||
2590 | /* Nothing special about this RTX; fix its operands. */ | |
2591 | ||
2592 | fmt = GET_RTX_FORMAT (code); | |
2593 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2594 | { | |
2595 | if (fmt[i] == 'e') | |
00d8a4c1 | 2596 | fixup_var_refs_1 (var, promoted_mode, &XEXP (x, i), insn, replacements); |
6f086dfc RS |
2597 | if (fmt[i] == 'E') |
2598 | { | |
2599 | register int j; | |
2600 | for (j = 0; j < XVECLEN (x, i); j++) | |
00d8a4c1 RK |
2601 | fixup_var_refs_1 (var, promoted_mode, &XVECEXP (x, i, j), |
2602 | insn, replacements); | |
6f086dfc RS |
2603 | } |
2604 | } | |
2605 | } | |
2606 | \f | |
2607 | /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)), | |
2608 | return an rtx (MEM:m1 newaddr) which is equivalent. | |
2609 | If any insns must be emitted to compute NEWADDR, put them before INSN. | |
2610 | ||
2611 | UNCRITICAL nonzero means accept paradoxical subregs. | |
0f41302f | 2612 | This is used for subregs found inside REG_NOTES. */ |
6f086dfc RS |
2613 | |
2614 | static rtx | |
2615 | fixup_memory_subreg (x, insn, uncritical) | |
2616 | rtx x; | |
2617 | rtx insn; | |
2618 | int uncritical; | |
2619 | { | |
2620 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
2621 | rtx addr = XEXP (SUBREG_REG (x), 0); | |
2622 | enum machine_mode mode = GET_MODE (x); | |
29a82058 | 2623 | rtx result; |
6f086dfc RS |
2624 | |
2625 | /* Paradoxical SUBREGs are usually invalid during RTL generation. */ | |
2626 | if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) | |
2627 | && ! uncritical) | |
2628 | abort (); | |
2629 | ||
f76b9db2 ILT |
2630 | if (BYTES_BIG_ENDIAN) |
2631 | offset += (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
2632 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
6f086dfc RS |
2633 | addr = plus_constant (addr, offset); |
2634 | if (!flag_force_addr && memory_address_p (mode, addr)) | |
2635 | /* Shortcut if no insns need be emitted. */ | |
2636 | return change_address (SUBREG_REG (x), mode, addr); | |
2637 | start_sequence (); | |
2638 | result = change_address (SUBREG_REG (x), mode, addr); | |
2639 | emit_insn_before (gen_sequence (), insn); | |
2640 | end_sequence (); | |
2641 | return result; | |
2642 | } | |
2643 | ||
2644 | /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X. | |
2645 | Replace subexpressions of X in place. | |
2646 | If X itself is a (SUBREG (MEM ...) ...), return the replacement expression. | |
2647 | Otherwise return X, with its contents possibly altered. | |
2648 | ||
ab6155b7 RK |
2649 | If any insns must be emitted to compute NEWADDR, put them before INSN. |
2650 | ||
2651 | UNCRITICAL is as in fixup_memory_subreg. */ | |
6f086dfc RS |
2652 | |
2653 | static rtx | |
ab6155b7 | 2654 | walk_fixup_memory_subreg (x, insn, uncritical) |
6f086dfc RS |
2655 | register rtx x; |
2656 | rtx insn; | |
ab6155b7 | 2657 | int uncritical; |
6f086dfc RS |
2658 | { |
2659 | register enum rtx_code code; | |
2660 | register char *fmt; | |
2661 | register int i; | |
2662 | ||
2663 | if (x == 0) | |
2664 | return 0; | |
2665 | ||
2666 | code = GET_CODE (x); | |
2667 | ||
2668 | if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == MEM) | |
ab6155b7 | 2669 | return fixup_memory_subreg (x, insn, uncritical); |
6f086dfc RS |
2670 | |
2671 | /* Nothing special about this RTX; fix its operands. */ | |
2672 | ||
2673 | fmt = GET_RTX_FORMAT (code); | |
2674 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2675 | { | |
2676 | if (fmt[i] == 'e') | |
ab6155b7 | 2677 | XEXP (x, i) = walk_fixup_memory_subreg (XEXP (x, i), insn, uncritical); |
6f086dfc RS |
2678 | if (fmt[i] == 'E') |
2679 | { | |
2680 | register int j; | |
2681 | for (j = 0; j < XVECLEN (x, i); j++) | |
2682 | XVECEXP (x, i, j) | |
ab6155b7 | 2683 | = walk_fixup_memory_subreg (XVECEXP (x, i, j), insn, uncritical); |
6f086dfc RS |
2684 | } |
2685 | } | |
2686 | return x; | |
2687 | } | |
2688 | \f | |
6f086dfc RS |
2689 | /* For each memory ref within X, if it refers to a stack slot |
2690 | with an out of range displacement, put the address in a temp register | |
2691 | (emitting new insns before INSN to load these registers) | |
2692 | and alter the memory ref to use that register. | |
2693 | Replace each such MEM rtx with a copy, to avoid clobberage. */ | |
2694 | ||
2695 | static rtx | |
2696 | fixup_stack_1 (x, insn) | |
2697 | rtx x; | |
2698 | rtx insn; | |
2699 | { | |
2700 | register int i; | |
2701 | register RTX_CODE code = GET_CODE (x); | |
2702 | register char *fmt; | |
2703 | ||
2704 | if (code == MEM) | |
2705 | { | |
2706 | register rtx ad = XEXP (x, 0); | |
2707 | /* If we have address of a stack slot but it's not valid | |
2708 | (displacement is too large), compute the sum in a register. */ | |
2709 | if (GET_CODE (ad) == PLUS | |
2710 | && GET_CODE (XEXP (ad, 0)) == REG | |
40d05551 RK |
2711 | && ((REGNO (XEXP (ad, 0)) >= FIRST_VIRTUAL_REGISTER |
2712 | && REGNO (XEXP (ad, 0)) <= LAST_VIRTUAL_REGISTER) | |
e9a25f70 JL |
2713 | || REGNO (XEXP (ad, 0)) == FRAME_POINTER_REGNUM |
2714 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
2715 | || REGNO (XEXP (ad, 0)) == HARD_FRAME_POINTER_REGNUM | |
2716 | #endif | |
2717 | || REGNO (XEXP (ad, 0)) == STACK_POINTER_REGNUM | |
956d6950 | 2718 | || REGNO (XEXP (ad, 0)) == ARG_POINTER_REGNUM |
40d05551 | 2719 | || XEXP (ad, 0) == current_function_internal_arg_pointer) |
6f086dfc RS |
2720 | && GET_CODE (XEXP (ad, 1)) == CONST_INT) |
2721 | { | |
2722 | rtx temp, seq; | |
2723 | if (memory_address_p (GET_MODE (x), ad)) | |
2724 | return x; | |
2725 | ||
2726 | start_sequence (); | |
2727 | temp = copy_to_reg (ad); | |
2728 | seq = gen_sequence (); | |
2729 | end_sequence (); | |
2730 | emit_insn_before (seq, insn); | |
2731 | return change_address (x, VOIDmode, temp); | |
2732 | } | |
2733 | return x; | |
2734 | } | |
2735 | ||
2736 | fmt = GET_RTX_FORMAT (code); | |
2737 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2738 | { | |
2739 | if (fmt[i] == 'e') | |
2740 | XEXP (x, i) = fixup_stack_1 (XEXP (x, i), insn); | |
2741 | if (fmt[i] == 'E') | |
2742 | { | |
2743 | register int j; | |
2744 | for (j = 0; j < XVECLEN (x, i); j++) | |
2745 | XVECEXP (x, i, j) = fixup_stack_1 (XVECEXP (x, i, j), insn); | |
2746 | } | |
2747 | } | |
2748 | return x; | |
2749 | } | |
2750 | \f | |
2751 | /* Optimization: a bit-field instruction whose field | |
2752 | happens to be a byte or halfword in memory | |
2753 | can be changed to a move instruction. | |
2754 | ||
2755 | We call here when INSN is an insn to examine or store into a bit-field. | |
2756 | BODY is the SET-rtx to be altered. | |
2757 | ||
2758 | EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0. | |
2759 | (Currently this is called only from function.c, and EQUIV_MEM | |
2760 | is always 0.) */ | |
2761 | ||
2762 | static void | |
2763 | optimize_bit_field (body, insn, equiv_mem) | |
2764 | rtx body; | |
2765 | rtx insn; | |
2766 | rtx *equiv_mem; | |
2767 | { | |
2768 | register rtx bitfield; | |
2769 | int destflag; | |
2770 | rtx seq = 0; | |
2771 | enum machine_mode mode; | |
2772 | ||
2773 | if (GET_CODE (SET_DEST (body)) == SIGN_EXTRACT | |
2774 | || GET_CODE (SET_DEST (body)) == ZERO_EXTRACT) | |
2775 | bitfield = SET_DEST (body), destflag = 1; | |
2776 | else | |
2777 | bitfield = SET_SRC (body), destflag = 0; | |
2778 | ||
2779 | /* First check that the field being stored has constant size and position | |
2780 | and is in fact a byte or halfword suitably aligned. */ | |
2781 | ||
2782 | if (GET_CODE (XEXP (bitfield, 1)) == CONST_INT | |
2783 | && GET_CODE (XEXP (bitfield, 2)) == CONST_INT | |
2784 | && ((mode = mode_for_size (INTVAL (XEXP (bitfield, 1)), MODE_INT, 1)) | |
2785 | != BLKmode) | |
2786 | && INTVAL (XEXP (bitfield, 2)) % INTVAL (XEXP (bitfield, 1)) == 0) | |
2787 | { | |
2788 | register rtx memref = 0; | |
2789 | ||
2790 | /* Now check that the containing word is memory, not a register, | |
2791 | and that it is safe to change the machine mode. */ | |
2792 | ||
2793 | if (GET_CODE (XEXP (bitfield, 0)) == MEM) | |
2794 | memref = XEXP (bitfield, 0); | |
2795 | else if (GET_CODE (XEXP (bitfield, 0)) == REG | |
2796 | && equiv_mem != 0) | |
2797 | memref = equiv_mem[REGNO (XEXP (bitfield, 0))]; | |
2798 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2799 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == MEM) | |
2800 | memref = SUBREG_REG (XEXP (bitfield, 0)); | |
2801 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2802 | && equiv_mem != 0 | |
2803 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == REG) | |
2804 | memref = equiv_mem[REGNO (SUBREG_REG (XEXP (bitfield, 0)))]; | |
2805 | ||
2806 | if (memref | |
2807 | && ! mode_dependent_address_p (XEXP (memref, 0)) | |
2808 | && ! MEM_VOLATILE_P (memref)) | |
2809 | { | |
2810 | /* Now adjust the address, first for any subreg'ing | |
2811 | that we are now getting rid of, | |
2812 | and then for which byte of the word is wanted. */ | |
2813 | ||
e5e809f4 | 2814 | HOST_WIDE_INT offset = INTVAL (XEXP (bitfield, 2)); |
b88a3142 RK |
2815 | rtx insns; |
2816 | ||
6f086dfc | 2817 | /* Adjust OFFSET to count bits from low-address byte. */ |
f76b9db2 ILT |
2818 | if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN) |
2819 | offset = (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield, 0))) | |
2820 | - offset - INTVAL (XEXP (bitfield, 1))); | |
2821 | ||
6f086dfc RS |
2822 | /* Adjust OFFSET to count bytes from low-address byte. */ |
2823 | offset /= BITS_PER_UNIT; | |
2824 | if (GET_CODE (XEXP (bitfield, 0)) == SUBREG) | |
2825 | { | |
2826 | offset += SUBREG_WORD (XEXP (bitfield, 0)) * UNITS_PER_WORD; | |
f76b9db2 ILT |
2827 | if (BYTES_BIG_ENDIAN) |
2828 | offset -= (MIN (UNITS_PER_WORD, | |
2829 | GET_MODE_SIZE (GET_MODE (XEXP (bitfield, 0)))) | |
2830 | - MIN (UNITS_PER_WORD, | |
2831 | GET_MODE_SIZE (GET_MODE (memref)))); | |
6f086dfc RS |
2832 | } |
2833 | ||
b88a3142 RK |
2834 | start_sequence (); |
2835 | memref = change_address (memref, mode, | |
6f086dfc | 2836 | plus_constant (XEXP (memref, 0), offset)); |
b88a3142 RK |
2837 | insns = get_insns (); |
2838 | end_sequence (); | |
2839 | emit_insns_before (insns, insn); | |
6f086dfc RS |
2840 | |
2841 | /* Store this memory reference where | |
2842 | we found the bit field reference. */ | |
2843 | ||
2844 | if (destflag) | |
2845 | { | |
2846 | validate_change (insn, &SET_DEST (body), memref, 1); | |
2847 | if (! CONSTANT_ADDRESS_P (SET_SRC (body))) | |
2848 | { | |
2849 | rtx src = SET_SRC (body); | |
2850 | while (GET_CODE (src) == SUBREG | |
2851 | && SUBREG_WORD (src) == 0) | |
2852 | src = SUBREG_REG (src); | |
2853 | if (GET_MODE (src) != GET_MODE (memref)) | |
2854 | src = gen_lowpart (GET_MODE (memref), SET_SRC (body)); | |
2855 | validate_change (insn, &SET_SRC (body), src, 1); | |
2856 | } | |
2857 | else if (GET_MODE (SET_SRC (body)) != VOIDmode | |
2858 | && GET_MODE (SET_SRC (body)) != GET_MODE (memref)) | |
2859 | /* This shouldn't happen because anything that didn't have | |
2860 | one of these modes should have got converted explicitly | |
2861 | and then referenced through a subreg. | |
2862 | This is so because the original bit-field was | |
2863 | handled by agg_mode and so its tree structure had | |
2864 | the same mode that memref now has. */ | |
2865 | abort (); | |
2866 | } | |
2867 | else | |
2868 | { | |
2869 | rtx dest = SET_DEST (body); | |
2870 | ||
2871 | while (GET_CODE (dest) == SUBREG | |
4013a709 RK |
2872 | && SUBREG_WORD (dest) == 0 |
2873 | && (GET_MODE_CLASS (GET_MODE (dest)) | |
ab87f8c8 JL |
2874 | == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest)))) |
2875 | && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
2876 | <= UNITS_PER_WORD)) | |
6f086dfc RS |
2877 | dest = SUBREG_REG (dest); |
2878 | ||
2879 | validate_change (insn, &SET_DEST (body), dest, 1); | |
2880 | ||
2881 | if (GET_MODE (dest) == GET_MODE (memref)) | |
2882 | validate_change (insn, &SET_SRC (body), memref, 1); | |
2883 | else | |
2884 | { | |
2885 | /* Convert the mem ref to the destination mode. */ | |
2886 | rtx newreg = gen_reg_rtx (GET_MODE (dest)); | |
2887 | ||
2888 | start_sequence (); | |
2889 | convert_move (newreg, memref, | |
2890 | GET_CODE (SET_SRC (body)) == ZERO_EXTRACT); | |
2891 | seq = get_insns (); | |
2892 | end_sequence (); | |
2893 | ||
2894 | validate_change (insn, &SET_SRC (body), newreg, 1); | |
2895 | } | |
2896 | } | |
2897 | ||
2898 | /* See if we can convert this extraction or insertion into | |
2899 | a simple move insn. We might not be able to do so if this | |
2900 | was, for example, part of a PARALLEL. | |
2901 | ||
2902 | If we succeed, write out any needed conversions. If we fail, | |
2903 | it is hard to guess why we failed, so don't do anything | |
2904 | special; just let the optimization be suppressed. */ | |
2905 | ||
2906 | if (apply_change_group () && seq) | |
2907 | emit_insns_before (seq, insn); | |
2908 | } | |
2909 | } | |
2910 | } | |
2911 | \f | |
2912 | /* These routines are responsible for converting virtual register references | |
2913 | to the actual hard register references once RTL generation is complete. | |
2914 | ||
2915 | The following four variables are used for communication between the | |
2916 | routines. They contain the offsets of the virtual registers from their | |
2917 | respective hard registers. */ | |
2918 | ||
2919 | static int in_arg_offset; | |
2920 | static int var_offset; | |
2921 | static int dynamic_offset; | |
2922 | static int out_arg_offset; | |
71038426 | 2923 | static int cfa_offset; |
6f086dfc RS |
2924 | |
2925 | /* In most machines, the stack pointer register is equivalent to the bottom | |
2926 | of the stack. */ | |
2927 | ||
2928 | #ifndef STACK_POINTER_OFFSET | |
2929 | #define STACK_POINTER_OFFSET 0 | |
2930 | #endif | |
2931 | ||
2932 | /* If not defined, pick an appropriate default for the offset of dynamically | |
2933 | allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS, | |
2934 | REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */ | |
2935 | ||
2936 | #ifndef STACK_DYNAMIC_OFFSET | |
2937 | ||
2938 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2939 | /* The bottom of the stack points to the actual arguments. If | |
2940 | REG_PARM_STACK_SPACE is defined, this includes the space for the register | |
2941 | parameters. However, if OUTGOING_REG_PARM_STACK space is not defined, | |
2942 | stack space for register parameters is not pushed by the caller, but | |
2943 | rather part of the fixed stack areas and hence not included in | |
2944 | `current_function_outgoing_args_size'. Nevertheless, we must allow | |
2945 | for it when allocating stack dynamic objects. */ | |
2946 | ||
2947 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
2948 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2949 | (current_function_outgoing_args_size \ | |
2950 | + REG_PARM_STACK_SPACE (FNDECL) + (STACK_POINTER_OFFSET)) | |
2951 | ||
2952 | #else | |
2953 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2954 | (current_function_outgoing_args_size + (STACK_POINTER_OFFSET)) | |
2955 | #endif | |
2956 | ||
2957 | #else | |
2958 | #define STACK_DYNAMIC_OFFSET(FNDECL) STACK_POINTER_OFFSET | |
2959 | #endif | |
2960 | #endif | |
2961 | ||
71038426 RH |
2962 | /* On a few machines, the CFA coincides with the arg pointer. */ |
2963 | ||
2964 | #ifndef ARG_POINTER_CFA_OFFSET | |
2965 | #define ARG_POINTER_CFA_OFFSET 0 | |
2966 | #endif | |
2967 | ||
2968 | ||
e9a25f70 JL |
2969 | /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had |
2970 | its address taken. DECL is the decl for the object stored in the | |
2971 | register, for later use if we do need to force REG into the stack. | |
2972 | REG is overwritten by the MEM like in put_reg_into_stack. */ | |
2973 | ||
2974 | rtx | |
2975 | gen_mem_addressof (reg, decl) | |
2976 | rtx reg; | |
2977 | tree decl; | |
2978 | { | |
2979 | tree type = TREE_TYPE (decl); | |
38a448ca | 2980 | rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)), REGNO (reg)); |
e9a25f70 | 2981 | SET_ADDRESSOF_DECL (r, decl); |
95ca22f4 MM |
2982 | /* If the original REG was a user-variable, then so is the REG whose |
2983 | address is being taken. */ | |
2984 | REG_USERVAR_P (XEXP (r, 0)) = REG_USERVAR_P (reg); | |
e9a25f70 JL |
2985 | |
2986 | XEXP (reg, 0) = r; | |
2987 | PUT_CODE (reg, MEM); | |
2988 | PUT_MODE (reg, DECL_MODE (decl)); | |
2989 | MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl); | |
c6df88cb | 2990 | MEM_SET_IN_STRUCT_P (reg, AGGREGATE_TYPE_P (type)); |
41472af8 | 2991 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
e9a25f70 | 2992 | |
e5e809f4 | 2993 | if (TREE_USED (decl) || DECL_INITIAL (decl) != 0) |
fe9b4957 | 2994 | fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), 0); |
e5e809f4 | 2995 | |
e9a25f70 JL |
2996 | return reg; |
2997 | } | |
2998 | ||
2999 | /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */ | |
3000 | ||
3001 | void | |
3002 | flush_addressof (decl) | |
3003 | tree decl; | |
3004 | { | |
3005 | if ((TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == VAR_DECL) | |
3006 | && DECL_RTL (decl) != 0 | |
3007 | && GET_CODE (DECL_RTL (decl)) == MEM | |
3008 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF | |
3009 | && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == REG) | |
fe9b4957 | 3010 | put_addressof_into_stack (XEXP (DECL_RTL (decl), 0), 0); |
e9a25f70 JL |
3011 | } |
3012 | ||
3013 | /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */ | |
3014 | ||
3015 | static void | |
fe9b4957 | 3016 | put_addressof_into_stack (r, ht) |
e9a25f70 | 3017 | rtx r; |
fe9b4957 | 3018 | struct hash_table *ht; |
e9a25f70 JL |
3019 | { |
3020 | tree decl = ADDRESSOF_DECL (r); | |
3021 | rtx reg = XEXP (r, 0); | |
3022 | ||
3023 | if (GET_CODE (reg) != REG) | |
3024 | abort (); | |
3025 | ||
3026 | put_reg_into_stack (0, reg, TREE_TYPE (decl), GET_MODE (reg), | |
3027 | DECL_MODE (decl), TREE_SIDE_EFFECTS (decl), | |
e5e809f4 | 3028 | ADDRESSOF_REGNO (r), |
fe9b4957 | 3029 | TREE_USED (decl) || DECL_INITIAL (decl) != 0, ht); |
e9a25f70 JL |
3030 | } |
3031 | ||
b5bd3b3c AS |
3032 | /* List of replacements made below in purge_addressof_1 when creating |
3033 | bitfield insertions. */ | |
3034 | static rtx purge_addressof_replacements; | |
3035 | ||
e9a25f70 JL |
3036 | /* Helper function for purge_addressof. See if the rtx expression at *LOC |
3037 | in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into | |
3038 | the stack. */ | |
3039 | ||
3040 | static void | |
fe9b4957 | 3041 | purge_addressof_1 (loc, insn, force, store, ht) |
e9a25f70 JL |
3042 | rtx *loc; |
3043 | rtx insn; | |
f7b6d104 | 3044 | int force, store; |
fe9b4957 | 3045 | struct hash_table *ht; |
e9a25f70 JL |
3046 | { |
3047 | rtx x; | |
3048 | RTX_CODE code; | |
3049 | int i, j; | |
3050 | char *fmt; | |
3051 | ||
3052 | /* Re-start here to avoid recursion in common cases. */ | |
3053 | restart: | |
3054 | ||
3055 | x = *loc; | |
3056 | if (x == 0) | |
3057 | return; | |
3058 | ||
3059 | code = GET_CODE (x); | |
3060 | ||
3061 | if (code == ADDRESSOF && GET_CODE (XEXP (x, 0)) == MEM) | |
3062 | { | |
3063 | rtx insns; | |
956d6950 JL |
3064 | /* We must create a copy of the rtx because it was created by |
3065 | overwriting a REG rtx which is always shared. */ | |
3066 | rtx sub = copy_rtx (XEXP (XEXP (x, 0), 0)); | |
e9a25f70 | 3067 | |
ab87f8c8 JL |
3068 | if (validate_change (insn, loc, sub, 0) |
3069 | || validate_replace_rtx (x, sub, insn)) | |
e9a25f70 | 3070 | return; |
ab87f8c8 | 3071 | |
e9a25f70 | 3072 | start_sequence (); |
ab87f8c8 JL |
3073 | sub = force_operand (sub, NULL_RTX); |
3074 | if (! validate_change (insn, loc, sub, 0) | |
3075 | && ! validate_replace_rtx (x, sub, insn)) | |
e9a25f70 JL |
3076 | abort (); |
3077 | ||
f7b6d104 | 3078 | insns = gen_sequence (); |
e9a25f70 | 3079 | end_sequence (); |
18e765cb | 3080 | emit_insn_before (insns, insn); |
e9a25f70 JL |
3081 | return; |
3082 | } | |
3083 | else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force) | |
3084 | { | |
3085 | rtx sub = XEXP (XEXP (x, 0), 0); | |
ab87f8c8 | 3086 | rtx sub2; |
e5e809f4 | 3087 | |
6d8ccdbb | 3088 | if (GET_CODE (sub) == MEM) |
ab87f8c8 JL |
3089 | { |
3090 | sub2 = gen_rtx_MEM (GET_MODE (x), copy_rtx (XEXP (sub, 0))); | |
3091 | MEM_COPY_ATTRIBUTES (sub2, sub); | |
3092 | RTX_UNCHANGING_P (sub2) = RTX_UNCHANGING_P (sub); | |
3093 | sub = sub2; | |
3094 | } | |
e5e809f4 | 3095 | |
f5963e61 JL |
3096 | if (GET_CODE (sub) == REG |
3097 | && (MEM_VOLATILE_P (x) || GET_MODE (x) == BLKmode)) | |
e5e809f4 | 3098 | { |
fe9b4957 | 3099 | put_addressof_into_stack (XEXP (x, 0), ht); |
e5e809f4 JL |
3100 | return; |
3101 | } | |
3102 | else if (GET_CODE (sub) == REG && GET_MODE (x) != GET_MODE (sub)) | |
e9a25f70 | 3103 | { |
f7b6d104 RH |
3104 | int size_x, size_sub; |
3105 | ||
b5bd3b3c AS |
3106 | if (!insn) |
3107 | { | |
3108 | /* When processing REG_NOTES look at the list of | |
3109 | replacements done on the insn to find the register that X | |
3110 | was replaced by. */ | |
3111 | rtx tem; | |
3112 | ||
3113 | for (tem = purge_addressof_replacements; tem != NULL_RTX; | |
3114 | tem = XEXP (XEXP (tem, 1), 1)) | |
fbdfe39c RH |
3115 | { |
3116 | rtx y = XEXP (tem, 0); | |
3117 | if (GET_CODE (y) == MEM | |
3118 | && rtx_equal_p (XEXP (x, 0), XEXP (y, 0))) | |
3119 | { | |
3120 | /* It can happen that the note may speak of things in | |
3121 | a wider (or just different) mode than the code did. | |
3122 | This is especially true of REG_RETVAL. */ | |
3123 | ||
3124 | rtx z = XEXP (XEXP (tem, 1), 0); | |
3125 | if (GET_MODE (x) != GET_MODE (y)) | |
3126 | { | |
3127 | if (GET_CODE (z) == SUBREG && SUBREG_WORD (z) == 0) | |
3128 | z = SUBREG_REG (z); | |
3129 | ||
3130 | /* ??? If we'd gotten into any of the really complex | |
3131 | cases below, I'm not sure we can do a proper | |
3132 | replacement. Might we be able to delete the | |
3133 | note in some cases? */ | |
3134 | if (GET_MODE_SIZE (GET_MODE (x)) | |
3135 | < GET_MODE_SIZE (GET_MODE (y))) | |
3136 | abort (); | |
3137 | ||
d91dfff4 R |
3138 | if (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD |
3139 | && (GET_MODE_SIZE (GET_MODE (x)) | |
3140 | > GET_MODE_SIZE (GET_MODE (z)))) | |
3141 | { | |
3142 | /* This can occur as a result in invalid | |
3143 | pointer casts, e.g. float f; ... | |
3144 | *(long long int *)&f. | |
3145 | ??? We could emit a warning here, but | |
3146 | without a line number that wouldn't be | |
3147 | very helpful. */ | |
3148 | z = gen_rtx_SUBREG (GET_MODE (x), z, 0); | |
3149 | } | |
3150 | else | |
3151 | z = gen_lowpart (GET_MODE (x), z); | |
fbdfe39c RH |
3152 | } |
3153 | ||
3154 | *loc = z; | |
3155 | return; | |
3156 | } | |
3157 | } | |
b5bd3b3c AS |
3158 | |
3159 | /* There should always be such a replacement. */ | |
3160 | abort (); | |
3161 | } | |
3162 | ||
f7b6d104 RH |
3163 | size_x = GET_MODE_BITSIZE (GET_MODE (x)); |
3164 | size_sub = GET_MODE_BITSIZE (GET_MODE (sub)); | |
3165 | ||
3166 | /* Don't even consider working with paradoxical subregs, | |
3167 | or the moral equivalent seen here. */ | |
470032d7 | 3168 | if (size_x <= size_sub |
d006aa54 | 3169 | && int_mode_for_mode (GET_MODE (sub)) != BLKmode) |
e9a25f70 | 3170 | { |
f7b6d104 RH |
3171 | /* Do a bitfield insertion to mirror what would happen |
3172 | in memory. */ | |
3173 | ||
f7b6d104 RH |
3174 | rtx val, seq; |
3175 | ||
f7b6d104 RH |
3176 | if (store) |
3177 | { | |
fe9b4957 | 3178 | rtx p = PREV_INSN (insn); |
de0dd934 | 3179 | |
f7b6d104 RH |
3180 | start_sequence (); |
3181 | val = gen_reg_rtx (GET_MODE (x)); | |
3182 | if (! validate_change (insn, loc, val, 0)) | |
b5bd3b3c AS |
3183 | { |
3184 | /* Discard the current sequence and put the | |
3185 | ADDRESSOF on stack. */ | |
3186 | end_sequence (); | |
3187 | goto give_up; | |
3188 | } | |
f7b6d104 RH |
3189 | seq = gen_sequence (); |
3190 | end_sequence (); | |
3191 | emit_insn_before (seq, insn); | |
fe9b4957 MM |
3192 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
3193 | insn, ht); | |
f7b6d104 RH |
3194 | |
3195 | start_sequence (); | |
47401c4d | 3196 | store_bit_field (sub, size_x, 0, GET_MODE (x), |
f7b6d104 RH |
3197 | val, GET_MODE_SIZE (GET_MODE (sub)), |
3198 | GET_MODE_SIZE (GET_MODE (sub))); | |
3199 | ||
de0dd934 R |
3200 | /* Make sure to unshare any shared rtl that store_bit_field |
3201 | might have created. */ | |
3202 | for (p = get_insns(); p; p = NEXT_INSN (p)) | |
3203 | { | |
3204 | reset_used_flags (PATTERN (p)); | |
3205 | reset_used_flags (REG_NOTES (p)); | |
3206 | reset_used_flags (LOG_LINKS (p)); | |
3207 | } | |
3208 | unshare_all_rtl (get_insns ()); | |
3209 | ||
f7b6d104 RH |
3210 | seq = gen_sequence (); |
3211 | end_sequence (); | |
fe9b4957 MM |
3212 | p = emit_insn_after (seq, insn); |
3213 | if (NEXT_INSN (insn)) | |
3214 | compute_insns_for_mem (NEXT_INSN (insn), | |
3215 | p ? NEXT_INSN (p) : NULL_RTX, | |
3216 | ht); | |
f7b6d104 RH |
3217 | } |
3218 | else | |
3219 | { | |
fe9b4957 MM |
3220 | rtx p = PREV_INSN (insn); |
3221 | ||
f7b6d104 | 3222 | start_sequence (); |
47401c4d | 3223 | val = extract_bit_field (sub, size_x, 0, 1, NULL_RTX, |
f7b6d104 RH |
3224 | GET_MODE (x), GET_MODE (x), |
3225 | GET_MODE_SIZE (GET_MODE (sub)), | |
3226 | GET_MODE_SIZE (GET_MODE (sub))); | |
3227 | ||
f7b6d104 | 3228 | if (! validate_change (insn, loc, val, 0)) |
b5bd3b3c AS |
3229 | { |
3230 | /* Discard the current sequence and put the | |
3231 | ADDRESSOF on stack. */ | |
3232 | end_sequence (); | |
3233 | goto give_up; | |
3234 | } | |
f7b6d104 RH |
3235 | |
3236 | seq = gen_sequence (); | |
3237 | end_sequence (); | |
3238 | emit_insn_before (seq, insn); | |
fe9b4957 MM |
3239 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
3240 | insn, ht); | |
f7b6d104 RH |
3241 | } |
3242 | ||
b5bd3b3c AS |
3243 | /* Remember the replacement so that the same one can be done |
3244 | on the REG_NOTES. */ | |
3245 | purge_addressof_replacements | |
3246 | = gen_rtx_EXPR_LIST (VOIDmode, x, | |
3247 | gen_rtx_EXPR_LIST (VOIDmode, val, | |
3248 | purge_addressof_replacements)); | |
3249 | ||
f7b6d104 RH |
3250 | /* We replaced with a reg -- all done. */ |
3251 | return; | |
e9a25f70 JL |
3252 | } |
3253 | } | |
3254 | else if (validate_change (insn, loc, sub, 0)) | |
fbdfe39c RH |
3255 | { |
3256 | /* Remember the replacement so that the same one can be done | |
3257 | on the REG_NOTES. */ | |
3258 | purge_addressof_replacements | |
3259 | = gen_rtx_EXPR_LIST (VOIDmode, x, | |
3260 | gen_rtx_EXPR_LIST (VOIDmode, sub, | |
3261 | purge_addressof_replacements)); | |
3262 | goto restart; | |
3263 | } | |
b5bd3b3c | 3264 | give_up:; |
e9a25f70 JL |
3265 | /* else give up and put it into the stack */ |
3266 | } | |
3267 | else if (code == ADDRESSOF) | |
3268 | { | |
fe9b4957 | 3269 | put_addressof_into_stack (x, ht); |
e9a25f70 JL |
3270 | return; |
3271 | } | |
f7b6d104 RH |
3272 | else if (code == SET) |
3273 | { | |
fe9b4957 MM |
3274 | purge_addressof_1 (&SET_DEST (x), insn, force, 1, ht); |
3275 | purge_addressof_1 (&SET_SRC (x), insn, force, 0, ht); | |
f7b6d104 RH |
3276 | return; |
3277 | } | |
e9a25f70 JL |
3278 | |
3279 | /* Scan all subexpressions. */ | |
3280 | fmt = GET_RTX_FORMAT (code); | |
3281 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
3282 | { | |
3283 | if (*fmt == 'e') | |
fe9b4957 | 3284 | purge_addressof_1 (&XEXP (x, i), insn, force, 0, ht); |
e9a25f70 JL |
3285 | else if (*fmt == 'E') |
3286 | for (j = 0; j < XVECLEN (x, i); j++) | |
fe9b4957 MM |
3287 | purge_addressof_1 (&XVECEXP (x, i, j), insn, force, 0, ht); |
3288 | } | |
3289 | } | |
3290 | ||
3291 | /* Return a new hash table entry in HT. */ | |
3292 | ||
3293 | static struct hash_entry * | |
3294 | insns_for_mem_newfunc (he, ht, k) | |
3295 | struct hash_entry *he; | |
3296 | struct hash_table *ht; | |
3297 | hash_table_key k ATTRIBUTE_UNUSED; | |
3298 | { | |
3299 | struct insns_for_mem_entry *ifmhe; | |
3300 | if (he) | |
3301 | return he; | |
3302 | ||
3303 | ifmhe = ((struct insns_for_mem_entry *) | |
3304 | hash_allocate (ht, sizeof (struct insns_for_mem_entry))); | |
3305 | ifmhe->insns = NULL_RTX; | |
3306 | ||
3307 | return &ifmhe->he; | |
3308 | } | |
3309 | ||
3310 | /* Return a hash value for K, a REG. */ | |
3311 | ||
3312 | static unsigned long | |
3313 | insns_for_mem_hash (k) | |
3314 | hash_table_key k; | |
3315 | { | |
3316 | /* K is really a RTX. Just use the address as the hash value. */ | |
3317 | return (unsigned long) k; | |
3318 | } | |
3319 | ||
3320 | /* Return non-zero if K1 and K2 (two REGs) are the same. */ | |
3321 | ||
3322 | static boolean | |
3323 | insns_for_mem_comp (k1, k2) | |
3324 | hash_table_key k1; | |
3325 | hash_table_key k2; | |
3326 | { | |
3327 | return k1 == k2; | |
3328 | } | |
3329 | ||
3330 | struct insns_for_mem_walk_info { | |
3331 | /* The hash table that we are using to record which INSNs use which | |
3332 | MEMs. */ | |
3333 | struct hash_table *ht; | |
3334 | ||
3335 | /* The INSN we are currently proessing. */ | |
3336 | rtx insn; | |
3337 | ||
3338 | /* Zero if we are walking to find ADDRESSOFs, one if we are walking | |
3339 | to find the insns that use the REGs in the ADDRESSOFs. */ | |
3340 | int pass; | |
3341 | }; | |
3342 | ||
3343 | /* Called from compute_insns_for_mem via for_each_rtx. If R is a REG | |
3344 | that might be used in an ADDRESSOF expression, record this INSN in | |
3345 | the hash table given by DATA (which is really a pointer to an | |
3346 | insns_for_mem_walk_info structure). */ | |
3347 | ||
3348 | static int | |
3349 | insns_for_mem_walk (r, data) | |
3350 | rtx *r; | |
3351 | void *data; | |
3352 | { | |
3353 | struct insns_for_mem_walk_info *ifmwi | |
3354 | = (struct insns_for_mem_walk_info *) data; | |
3355 | ||
3356 | if (ifmwi->pass == 0 && *r && GET_CODE (*r) == ADDRESSOF | |
3357 | && GET_CODE (XEXP (*r, 0)) == REG) | |
3358 | hash_lookup (ifmwi->ht, XEXP (*r, 0), /*create=*/1, /*copy=*/0); | |
3359 | else if (ifmwi->pass == 1 && *r && GET_CODE (*r) == REG) | |
3360 | { | |
3361 | /* Lookup this MEM in the hashtable, creating it if necessary. */ | |
3362 | struct insns_for_mem_entry *ifme | |
3363 | = (struct insns_for_mem_entry *) hash_lookup (ifmwi->ht, | |
3364 | *r, | |
3365 | /*create=*/0, | |
3366 | /*copy=*/0); | |
3367 | ||
3368 | /* If we have not already recorded this INSN, do so now. Since | |
3369 | we process the INSNs in order, we know that if we have | |
3370 | recorded it it must be at the front of the list. */ | |
3371 | if (ifme && (!ifme->insns || XEXP (ifme->insns, 0) != ifmwi->insn)) | |
3372 | { | |
3373 | /* We do the allocation on the same obstack as is used for | |
3374 | the hash table since this memory will not be used once | |
3375 | the hash table is deallocated. */ | |
3376 | push_obstacks (&ifmwi->ht->memory, &ifmwi->ht->memory); | |
3377 | ifme->insns = gen_rtx_EXPR_LIST (VOIDmode, ifmwi->insn, | |
3378 | ifme->insns); | |
3379 | pop_obstacks (); | |
3380 | } | |
e9a25f70 | 3381 | } |
fe9b4957 MM |
3382 | |
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | /* Walk the INSNS, until we reach LAST_INSN, recording which INSNs use | |
3387 | which REGs in HT. */ | |
3388 | ||
3389 | static void | |
3390 | compute_insns_for_mem (insns, last_insn, ht) | |
3391 | rtx insns; | |
3392 | rtx last_insn; | |
3393 | struct hash_table *ht; | |
3394 | { | |
3395 | rtx insn; | |
3396 | struct insns_for_mem_walk_info ifmwi; | |
3397 | ifmwi.ht = ht; | |
3398 | ||
3399 | for (ifmwi.pass = 0; ifmwi.pass < 2; ++ifmwi.pass) | |
3400 | for (insn = insns; insn != last_insn; insn = NEXT_INSN (insn)) | |
3401 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') | |
3402 | { | |
3403 | ifmwi.insn = insn; | |
3404 | for_each_rtx (&insn, insns_for_mem_walk, &ifmwi); | |
3405 | } | |
e9a25f70 JL |
3406 | } |
3407 | ||
3408 | /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining | |
3409 | (MEM (ADDRESSOF)) patterns, and force any needed registers into the | |
3410 | stack. */ | |
3411 | ||
3412 | void | |
3413 | purge_addressof (insns) | |
3414 | rtx insns; | |
3415 | { | |
3416 | rtx insn; | |
fe9b4957 MM |
3417 | struct hash_table ht; |
3418 | ||
3419 | /* When we actually purge ADDRESSOFs, we turn REGs into MEMs. That | |
3420 | requires a fixup pass over the instruction stream to correct | |
3421 | INSNs that depended on the REG being a REG, and not a MEM. But, | |
3422 | these fixup passes are slow. Furthermore, more MEMs are not | |
3423 | mentioned in very many instructions. So, we speed up the process | |
3424 | by pre-calculating which REGs occur in which INSNs; that allows | |
3425 | us to perform the fixup passes much more quickly. */ | |
3426 | hash_table_init (&ht, | |
3427 | insns_for_mem_newfunc, | |
3428 | insns_for_mem_hash, | |
3429 | insns_for_mem_comp); | |
3430 | compute_insns_for_mem (insns, NULL_RTX, &ht); | |
3431 | ||
e9a25f70 JL |
3432 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
3433 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3434 | || GET_CODE (insn) == CALL_INSN) | |
3435 | { | |
3436 | purge_addressof_1 (&PATTERN (insn), insn, | |
fe9b4957 MM |
3437 | asm_noperands (PATTERN (insn)) > 0, 0, &ht); |
3438 | purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0, 0, &ht); | |
e9a25f70 | 3439 | } |
fe9b4957 MM |
3440 | |
3441 | /* Clean up. */ | |
3442 | hash_table_free (&ht); | |
da9b1f9c | 3443 | purge_addressof_replacements = 0; |
e9a25f70 JL |
3444 | } |
3445 | \f | |
6f086dfc RS |
3446 | /* Pass through the INSNS of function FNDECL and convert virtual register |
3447 | references to hard register references. */ | |
3448 | ||
3449 | void | |
3450 | instantiate_virtual_regs (fndecl, insns) | |
3451 | tree fndecl; | |
3452 | rtx insns; | |
3453 | { | |
3454 | rtx insn; | |
e9a25f70 | 3455 | int i; |
6f086dfc RS |
3456 | |
3457 | /* Compute the offsets to use for this function. */ | |
3458 | in_arg_offset = FIRST_PARM_OFFSET (fndecl); | |
3459 | var_offset = STARTING_FRAME_OFFSET; | |
3460 | dynamic_offset = STACK_DYNAMIC_OFFSET (fndecl); | |
3461 | out_arg_offset = STACK_POINTER_OFFSET; | |
71038426 | 3462 | cfa_offset = ARG_POINTER_CFA_OFFSET; |
6f086dfc RS |
3463 | |
3464 | /* Scan all variables and parameters of this function. For each that is | |
3465 | in memory, instantiate all virtual registers if the result is a valid | |
3466 | address. If not, we do it later. That will handle most uses of virtual | |
3467 | regs on many machines. */ | |
3468 | instantiate_decls (fndecl, 1); | |
3469 | ||
3470 | /* Initialize recognition, indicating that volatile is OK. */ | |
3471 | init_recog (); | |
3472 | ||
3473 | /* Scan through all the insns, instantiating every virtual register still | |
3474 | present. */ | |
3475 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
3476 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3477 | || GET_CODE (insn) == CALL_INSN) | |
3478 | { | |
3479 | instantiate_virtual_regs_1 (&PATTERN (insn), insn, 1); | |
5f4f0e22 | 3480 | instantiate_virtual_regs_1 (®_NOTES (insn), NULL_RTX, 0); |
6f086dfc RS |
3481 | } |
3482 | ||
e9a25f70 JL |
3483 | /* Instantiate the stack slots for the parm registers, for later use in |
3484 | addressof elimination. */ | |
3485 | for (i = 0; i < max_parm_reg; ++i) | |
3486 | if (parm_reg_stack_loc[i]) | |
3487 | instantiate_virtual_regs_1 (&parm_reg_stack_loc[i], NULL_RTX, 0); | |
3488 | ||
6f086dfc RS |
3489 | /* Now instantiate the remaining register equivalences for debugging info. |
3490 | These will not be valid addresses. */ | |
3491 | instantiate_decls (fndecl, 0); | |
3492 | ||
3493 | /* Indicate that, from now on, assign_stack_local should use | |
3494 | frame_pointer_rtx. */ | |
3495 | virtuals_instantiated = 1; | |
3496 | } | |
3497 | ||
3498 | /* Scan all decls in FNDECL (both variables and parameters) and instantiate | |
3499 | all virtual registers in their DECL_RTL's. | |
3500 | ||
3501 | If VALID_ONLY, do this only if the resulting address is still valid. | |
3502 | Otherwise, always do it. */ | |
3503 | ||
3504 | static void | |
3505 | instantiate_decls (fndecl, valid_only) | |
3506 | tree fndecl; | |
3507 | int valid_only; | |
3508 | { | |
3509 | tree decl; | |
3510 | ||
e1686233 | 3511 | if (DECL_SAVED_INSNS (fndecl)) |
6f086dfc RS |
3512 | /* When compiling an inline function, the obstack used for |
3513 | rtl allocation is the maybepermanent_obstack. Calling | |
3514 | `resume_temporary_allocation' switches us back to that | |
3515 | obstack while we process this function's parameters. */ | |
3516 | resume_temporary_allocation (); | |
3517 | ||
3518 | /* Process all parameters of the function. */ | |
3519 | for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl)) | |
3520 | { | |
e5e809f4 JL |
3521 | HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (decl)); |
3522 | ||
ce717ce4 JW |
3523 | instantiate_decl (DECL_RTL (decl), size, valid_only); |
3524 | ||
3525 | /* If the parameter was promoted, then the incoming RTL mode may be | |
3526 | larger than the declared type size. We must use the larger of | |
3527 | the two sizes. */ | |
3528 | size = MAX (GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl))), size); | |
3529 | instantiate_decl (DECL_INCOMING_RTL (decl), size, valid_only); | |
6f086dfc RS |
3530 | } |
3531 | ||
0f41302f | 3532 | /* Now process all variables defined in the function or its subblocks. */ |
6f086dfc RS |
3533 | instantiate_decls_1 (DECL_INITIAL (fndecl), valid_only); |
3534 | ||
79c0672e | 3535 | if (DECL_INLINE (fndecl) || DECL_DEFER_OUTPUT (fndecl)) |
6f086dfc RS |
3536 | { |
3537 | /* Save all rtl allocated for this function by raising the | |
3538 | high-water mark on the maybepermanent_obstack. */ | |
3539 | preserve_data (); | |
3540 | /* All further rtl allocation is now done in the current_obstack. */ | |
3541 | rtl_in_current_obstack (); | |
3542 | } | |
3543 | } | |
3544 | ||
3545 | /* Subroutine of instantiate_decls: Process all decls in the given | |
3546 | BLOCK node and all its subblocks. */ | |
3547 | ||
3548 | static void | |
3549 | instantiate_decls_1 (let, valid_only) | |
3550 | tree let; | |
3551 | int valid_only; | |
3552 | { | |
3553 | tree t; | |
3554 | ||
3555 | for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t)) | |
5a73491b RK |
3556 | instantiate_decl (DECL_RTL (t), int_size_in_bytes (TREE_TYPE (t)), |
3557 | valid_only); | |
6f086dfc RS |
3558 | |
3559 | /* Process all subblocks. */ | |
3560 | for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t)) | |
3561 | instantiate_decls_1 (t, valid_only); | |
3562 | } | |
5a73491b | 3563 | |
8008b228 | 3564 | /* Subroutine of the preceding procedures: Given RTL representing a |
5a73491b RK |
3565 | decl and the size of the object, do any instantiation required. |
3566 | ||
3567 | If VALID_ONLY is non-zero, it means that the RTL should only be | |
3568 | changed if the new address is valid. */ | |
3569 | ||
3570 | static void | |
3571 | instantiate_decl (x, size, valid_only) | |
3572 | rtx x; | |
3573 | int size; | |
3574 | int valid_only; | |
3575 | { | |
3576 | enum machine_mode mode; | |
3577 | rtx addr; | |
3578 | ||
3579 | /* If this is not a MEM, no need to do anything. Similarly if the | |
3580 | address is a constant or a register that is not a virtual register. */ | |
3581 | ||
3582 | if (x == 0 || GET_CODE (x) != MEM) | |
3583 | return; | |
3584 | ||
3585 | addr = XEXP (x, 0); | |
3586 | if (CONSTANT_P (addr) | |
956d6950 | 3587 | || (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == REG) |
5a73491b RK |
3588 | || (GET_CODE (addr) == REG |
3589 | && (REGNO (addr) < FIRST_VIRTUAL_REGISTER | |
3590 | || REGNO (addr) > LAST_VIRTUAL_REGISTER))) | |
3591 | return; | |
3592 | ||
3593 | /* If we should only do this if the address is valid, copy the address. | |
3594 | We need to do this so we can undo any changes that might make the | |
3595 | address invalid. This copy is unfortunate, but probably can't be | |
3596 | avoided. */ | |
3597 | ||
3598 | if (valid_only) | |
3599 | addr = copy_rtx (addr); | |
3600 | ||
3601 | instantiate_virtual_regs_1 (&addr, NULL_RTX, 0); | |
3602 | ||
87ce34d6 JW |
3603 | if (valid_only) |
3604 | { | |
3605 | /* Now verify that the resulting address is valid for every integer or | |
3606 | floating-point mode up to and including SIZE bytes long. We do this | |
3607 | since the object might be accessed in any mode and frame addresses | |
3608 | are shared. */ | |
3609 | ||
3610 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
3611 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3612 | mode = GET_MODE_WIDER_MODE (mode)) | |
3613 | if (! memory_address_p (mode, addr)) | |
3614 | return; | |
5a73491b | 3615 | |
87ce34d6 JW |
3616 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); |
3617 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3618 | mode = GET_MODE_WIDER_MODE (mode)) | |
3619 | if (! memory_address_p (mode, addr)) | |
3620 | return; | |
3621 | } | |
5a73491b | 3622 | |
87ce34d6 JW |
3623 | /* Put back the address now that we have updated it and we either know |
3624 | it is valid or we don't care whether it is valid. */ | |
5a73491b RK |
3625 | |
3626 | XEXP (x, 0) = addr; | |
3627 | } | |
6f086dfc RS |
3628 | \f |
3629 | /* Given a pointer to a piece of rtx and an optional pointer to the | |
3630 | containing object, instantiate any virtual registers present in it. | |
3631 | ||
3632 | If EXTRA_INSNS, we always do the replacement and generate | |
3633 | any extra insns before OBJECT. If it zero, we do nothing if replacement | |
3634 | is not valid. | |
3635 | ||
3636 | Return 1 if we either had nothing to do or if we were able to do the | |
3637 | needed replacement. Return 0 otherwise; we only return zero if | |
3638 | EXTRA_INSNS is zero. | |
3639 | ||
3640 | We first try some simple transformations to avoid the creation of extra | |
3641 | pseudos. */ | |
3642 | ||
3643 | static int | |
3644 | instantiate_virtual_regs_1 (loc, object, extra_insns) | |
3645 | rtx *loc; | |
3646 | rtx object; | |
3647 | int extra_insns; | |
3648 | { | |
3649 | rtx x; | |
3650 | RTX_CODE code; | |
3651 | rtx new = 0; | |
e5e809f4 | 3652 | HOST_WIDE_INT offset; |
6f086dfc RS |
3653 | rtx temp; |
3654 | rtx seq; | |
3655 | int i, j; | |
3656 | char *fmt; | |
3657 | ||
3658 | /* Re-start here to avoid recursion in common cases. */ | |
3659 | restart: | |
3660 | ||
3661 | x = *loc; | |
3662 | if (x == 0) | |
3663 | return 1; | |
3664 | ||
3665 | code = GET_CODE (x); | |
3666 | ||
3667 | /* Check for some special cases. */ | |
3668 | switch (code) | |
3669 | { | |
3670 | case CONST_INT: | |
3671 | case CONST_DOUBLE: | |
3672 | case CONST: | |
3673 | case SYMBOL_REF: | |
3674 | case CODE_LABEL: | |
3675 | case PC: | |
3676 | case CC0: | |
3677 | case ASM_INPUT: | |
3678 | case ADDR_VEC: | |
3679 | case ADDR_DIFF_VEC: | |
3680 | case RETURN: | |
3681 | return 1; | |
3682 | ||
3683 | case SET: | |
3684 | /* We are allowed to set the virtual registers. This means that | |
38e01259 | 3685 | the actual register should receive the source minus the |
6f086dfc RS |
3686 | appropriate offset. This is used, for example, in the handling |
3687 | of non-local gotos. */ | |
3688 | if (SET_DEST (x) == virtual_incoming_args_rtx) | |
3689 | new = arg_pointer_rtx, offset = - in_arg_offset; | |
3690 | else if (SET_DEST (x) == virtual_stack_vars_rtx) | |
dfd3dae6 | 3691 | new = frame_pointer_rtx, offset = - var_offset; |
6f086dfc RS |
3692 | else if (SET_DEST (x) == virtual_stack_dynamic_rtx) |
3693 | new = stack_pointer_rtx, offset = - dynamic_offset; | |
3694 | else if (SET_DEST (x) == virtual_outgoing_args_rtx) | |
3695 | new = stack_pointer_rtx, offset = - out_arg_offset; | |
71038426 RH |
3696 | else if (SET_DEST (x) == virtual_cfa_rtx) |
3697 | new = arg_pointer_rtx, offset = - cfa_offset; | |
6f086dfc RS |
3698 | |
3699 | if (new) | |
3700 | { | |
3701 | /* The only valid sources here are PLUS or REG. Just do | |
3702 | the simplest possible thing to handle them. */ | |
3703 | if (GET_CODE (SET_SRC (x)) != REG | |
3704 | && GET_CODE (SET_SRC (x)) != PLUS) | |
3705 | abort (); | |
3706 | ||
3707 | start_sequence (); | |
3708 | if (GET_CODE (SET_SRC (x)) != REG) | |
5f4f0e22 | 3709 | temp = force_operand (SET_SRC (x), NULL_RTX); |
6f086dfc RS |
3710 | else |
3711 | temp = SET_SRC (x); | |
5f4f0e22 | 3712 | temp = force_operand (plus_constant (temp, offset), NULL_RTX); |
6f086dfc RS |
3713 | seq = get_insns (); |
3714 | end_sequence (); | |
3715 | ||
3716 | emit_insns_before (seq, object); | |
3717 | SET_DEST (x) = new; | |
3718 | ||
e9a25f70 | 3719 | if (! validate_change (object, &SET_SRC (x), temp, 0) |
6f086dfc RS |
3720 | || ! extra_insns) |
3721 | abort (); | |
3722 | ||
3723 | return 1; | |
3724 | } | |
3725 | ||
3726 | instantiate_virtual_regs_1 (&SET_DEST (x), object, extra_insns); | |
3727 | loc = &SET_SRC (x); | |
3728 | goto restart; | |
3729 | ||
3730 | case PLUS: | |
3731 | /* Handle special case of virtual register plus constant. */ | |
3732 | if (CONSTANT_P (XEXP (x, 1))) | |
3733 | { | |
b1f82ccf | 3734 | rtx old, new_offset; |
6f086dfc RS |
3735 | |
3736 | /* Check for (plus (plus VIRT foo) (const_int)) first. */ | |
3737 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
3738 | { | |
3739 | rtx inner = XEXP (XEXP (x, 0), 0); | |
3740 | ||
3741 | if (inner == virtual_incoming_args_rtx) | |
3742 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3743 | else if (inner == virtual_stack_vars_rtx) | |
3744 | new = frame_pointer_rtx, offset = var_offset; | |
3745 | else if (inner == virtual_stack_dynamic_rtx) | |
3746 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3747 | else if (inner == virtual_outgoing_args_rtx) | |
3748 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3749 | else if (inner == virtual_cfa_rtx) |
3750 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3751 | else |
3752 | { | |
3753 | loc = &XEXP (x, 0); | |
3754 | goto restart; | |
3755 | } | |
3756 | ||
3757 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 1), object, | |
3758 | extra_insns); | |
38a448ca | 3759 | new = gen_rtx_PLUS (Pmode, new, XEXP (XEXP (x, 0), 1)); |
6f086dfc RS |
3760 | } |
3761 | ||
3762 | else if (XEXP (x, 0) == virtual_incoming_args_rtx) | |
3763 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3764 | else if (XEXP (x, 0) == virtual_stack_vars_rtx) | |
3765 | new = frame_pointer_rtx, offset = var_offset; | |
3766 | else if (XEXP (x, 0) == virtual_stack_dynamic_rtx) | |
3767 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3768 | else if (XEXP (x, 0) == virtual_outgoing_args_rtx) | |
3769 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3770 | else if (XEXP (x, 0) == virtual_cfa_rtx) |
3771 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3772 | else |
3773 | { | |
3774 | /* We know the second operand is a constant. Unless the | |
3775 | first operand is a REG (which has been already checked), | |
3776 | it needs to be checked. */ | |
3777 | if (GET_CODE (XEXP (x, 0)) != REG) | |
3778 | { | |
3779 | loc = &XEXP (x, 0); | |
3780 | goto restart; | |
3781 | } | |
3782 | return 1; | |
3783 | } | |
3784 | ||
b1f82ccf | 3785 | new_offset = plus_constant (XEXP (x, 1), offset); |
6f086dfc | 3786 | |
b1f82ccf DE |
3787 | /* If the new constant is zero, try to replace the sum with just |
3788 | the register. */ | |
3789 | if (new_offset == const0_rtx | |
3790 | && validate_change (object, loc, new, 0)) | |
6f086dfc RS |
3791 | return 1; |
3792 | ||
b1f82ccf DE |
3793 | /* Next try to replace the register and new offset. |
3794 | There are two changes to validate here and we can't assume that | |
3795 | in the case of old offset equals new just changing the register | |
3796 | will yield a valid insn. In the interests of a little efficiency, | |
3797 | however, we only call validate change once (we don't queue up the | |
0f41302f | 3798 | changes and then call apply_change_group). */ |
b1f82ccf DE |
3799 | |
3800 | old = XEXP (x, 0); | |
3801 | if (offset == 0 | |
3802 | ? ! validate_change (object, &XEXP (x, 0), new, 0) | |
3803 | : (XEXP (x, 0) = new, | |
3804 | ! validate_change (object, &XEXP (x, 1), new_offset, 0))) | |
6f086dfc RS |
3805 | { |
3806 | if (! extra_insns) | |
3807 | { | |
3808 | XEXP (x, 0) = old; | |
3809 | return 0; | |
3810 | } | |
3811 | ||
3812 | /* Otherwise copy the new constant into a register and replace | |
3813 | constant with that register. */ | |
3814 | temp = gen_reg_rtx (Pmode); | |
b1f82ccf | 3815 | XEXP (x, 0) = new; |
6f086dfc | 3816 | if (validate_change (object, &XEXP (x, 1), temp, 0)) |
b1f82ccf | 3817 | emit_insn_before (gen_move_insn (temp, new_offset), object); |
6f086dfc RS |
3818 | else |
3819 | { | |
3820 | /* If that didn't work, replace this expression with a | |
3821 | register containing the sum. */ | |
3822 | ||
6f086dfc | 3823 | XEXP (x, 0) = old; |
38a448ca | 3824 | new = gen_rtx_PLUS (Pmode, new, new_offset); |
6f086dfc RS |
3825 | |
3826 | start_sequence (); | |
5f4f0e22 | 3827 | temp = force_operand (new, NULL_RTX); |
6f086dfc RS |
3828 | seq = get_insns (); |
3829 | end_sequence (); | |
3830 | ||
3831 | emit_insns_before (seq, object); | |
3832 | if (! validate_change (object, loc, temp, 0) | |
3833 | && ! validate_replace_rtx (x, temp, object)) | |
3834 | abort (); | |
3835 | } | |
3836 | } | |
3837 | ||
3838 | return 1; | |
3839 | } | |
3840 | ||
3841 | /* Fall through to generic two-operand expression case. */ | |
3842 | case EXPR_LIST: | |
3843 | case CALL: | |
3844 | case COMPARE: | |
3845 | case MINUS: | |
3846 | case MULT: | |
3847 | case DIV: case UDIV: | |
3848 | case MOD: case UMOD: | |
3849 | case AND: case IOR: case XOR: | |
45620ed4 RK |
3850 | case ROTATERT: case ROTATE: |
3851 | case ASHIFTRT: case LSHIFTRT: case ASHIFT: | |
6f086dfc RS |
3852 | case NE: case EQ: |
3853 | case GE: case GT: case GEU: case GTU: | |
3854 | case LE: case LT: case LEU: case LTU: | |
3855 | if (XEXP (x, 1) && ! CONSTANT_P (XEXP (x, 1))) | |
3856 | instantiate_virtual_regs_1 (&XEXP (x, 1), object, extra_insns); | |
3857 | loc = &XEXP (x, 0); | |
3858 | goto restart; | |
3859 | ||
3860 | case MEM: | |
3861 | /* Most cases of MEM that convert to valid addresses have already been | |
4fd796bb | 3862 | handled by our scan of decls. The only special handling we |
6f086dfc | 3863 | need here is to make a copy of the rtx to ensure it isn't being |
b335c2cc | 3864 | shared if we have to change it to a pseudo. |
6f086dfc RS |
3865 | |
3866 | If the rtx is a simple reference to an address via a virtual register, | |
3867 | it can potentially be shared. In such cases, first try to make it | |
3868 | a valid address, which can also be shared. Otherwise, copy it and | |
3869 | proceed normally. | |
3870 | ||
3871 | First check for common cases that need no processing. These are | |
3872 | usually due to instantiation already being done on a previous instance | |
3873 | of a shared rtx. */ | |
3874 | ||
3875 | temp = XEXP (x, 0); | |
3876 | if (CONSTANT_ADDRESS_P (temp) | |
3877 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM | |
3878 | || temp == arg_pointer_rtx | |
b37f453b DE |
3879 | #endif |
3880 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3881 | || temp == hard_frame_pointer_rtx | |
6f086dfc RS |
3882 | #endif |
3883 | || temp == frame_pointer_rtx) | |
3884 | return 1; | |
3885 | ||
3886 | if (GET_CODE (temp) == PLUS | |
3887 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3888 | && (XEXP (temp, 0) == frame_pointer_rtx | |
b37f453b DE |
3889 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM |
3890 | || XEXP (temp, 0) == hard_frame_pointer_rtx | |
3891 | #endif | |
6f086dfc RS |
3892 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
3893 | || XEXP (temp, 0) == arg_pointer_rtx | |
3894 | #endif | |
3895 | )) | |
3896 | return 1; | |
3897 | ||
3898 | if (temp == virtual_stack_vars_rtx | |
3899 | || temp == virtual_incoming_args_rtx | |
3900 | || (GET_CODE (temp) == PLUS | |
3901 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3902 | && (XEXP (temp, 0) == virtual_stack_vars_rtx | |
3903 | || XEXP (temp, 0) == virtual_incoming_args_rtx))) | |
3904 | { | |
3905 | /* This MEM may be shared. If the substitution can be done without | |
3906 | the need to generate new pseudos, we want to do it in place | |
3907 | so all copies of the shared rtx benefit. The call below will | |
3908 | only make substitutions if the resulting address is still | |
3909 | valid. | |
3910 | ||
3911 | Note that we cannot pass X as the object in the recursive call | |
3912 | since the insn being processed may not allow all valid | |
6461be14 RS |
3913 | addresses. However, if we were not passed on object, we can |
3914 | only modify X without copying it if X will have a valid | |
3915 | address. | |
6f086dfc | 3916 | |
6461be14 RS |
3917 | ??? Also note that this can still lose if OBJECT is an insn that |
3918 | has less restrictions on an address that some other insn. | |
3919 | In that case, we will modify the shared address. This case | |
4fd796bb RK |
3920 | doesn't seem very likely, though. One case where this could |
3921 | happen is in the case of a USE or CLOBBER reference, but we | |
3922 | take care of that below. */ | |
6461be14 RS |
3923 | |
3924 | if (instantiate_virtual_regs_1 (&XEXP (x, 0), | |
3925 | object ? object : x, 0)) | |
6f086dfc RS |
3926 | return 1; |
3927 | ||
3928 | /* Otherwise make a copy and process that copy. We copy the entire | |
3929 | RTL expression since it might be a PLUS which could also be | |
3930 | shared. */ | |
3931 | *loc = x = copy_rtx (x); | |
3932 | } | |
3933 | ||
3934 | /* Fall through to generic unary operation case. */ | |
6f086dfc RS |
3935 | case SUBREG: |
3936 | case STRICT_LOW_PART: | |
3937 | case NEG: case NOT: | |
3938 | case PRE_DEC: case PRE_INC: case POST_DEC: case POST_INC: | |
3939 | case SIGN_EXTEND: case ZERO_EXTEND: | |
3940 | case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE: | |
3941 | case FLOAT: case FIX: | |
3942 | case UNSIGNED_FIX: case UNSIGNED_FLOAT: | |
3943 | case ABS: | |
3944 | case SQRT: | |
3945 | case FFS: | |
3946 | /* These case either have just one operand or we know that we need not | |
3947 | check the rest of the operands. */ | |
3948 | loc = &XEXP (x, 0); | |
3949 | goto restart; | |
3950 | ||
4fd796bb RK |
3951 | case USE: |
3952 | case CLOBBER: | |
3953 | /* If the operand is a MEM, see if the change is a valid MEM. If not, | |
3954 | go ahead and make the invalid one, but do it to a copy. For a REG, | |
3955 | just make the recursive call, since there's no chance of a problem. */ | |
3956 | ||
3957 | if ((GET_CODE (XEXP (x, 0)) == MEM | |
3958 | && instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), XEXP (x, 0), | |
3959 | 0)) | |
3960 | || (GET_CODE (XEXP (x, 0)) == REG | |
7694ce35 | 3961 | && instantiate_virtual_regs_1 (&XEXP (x, 0), object, 0))) |
4fd796bb RK |
3962 | return 1; |
3963 | ||
3964 | XEXP (x, 0) = copy_rtx (XEXP (x, 0)); | |
3965 | loc = &XEXP (x, 0); | |
3966 | goto restart; | |
3967 | ||
6f086dfc RS |
3968 | case REG: |
3969 | /* Try to replace with a PLUS. If that doesn't work, compute the sum | |
3970 | in front of this insn and substitute the temporary. */ | |
3971 | if (x == virtual_incoming_args_rtx) | |
3972 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3973 | else if (x == virtual_stack_vars_rtx) | |
3974 | new = frame_pointer_rtx, offset = var_offset; | |
3975 | else if (x == virtual_stack_dynamic_rtx) | |
3976 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3977 | else if (x == virtual_outgoing_args_rtx) | |
3978 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3979 | else if (x == virtual_cfa_rtx) |
3980 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3981 | |
3982 | if (new) | |
3983 | { | |
3984 | temp = plus_constant (new, offset); | |
3985 | if (!validate_change (object, loc, temp, 0)) | |
3986 | { | |
3987 | if (! extra_insns) | |
3988 | return 0; | |
3989 | ||
3990 | start_sequence (); | |
5f4f0e22 | 3991 | temp = force_operand (temp, NULL_RTX); |
6f086dfc RS |
3992 | seq = get_insns (); |
3993 | end_sequence (); | |
3994 | ||
3995 | emit_insns_before (seq, object); | |
3996 | if (! validate_change (object, loc, temp, 0) | |
3997 | && ! validate_replace_rtx (x, temp, object)) | |
3998 | abort (); | |
3999 | } | |
4000 | } | |
4001 | ||
4002 | return 1; | |
e9a25f70 JL |
4003 | |
4004 | case ADDRESSOF: | |
4005 | if (GET_CODE (XEXP (x, 0)) == REG) | |
4006 | return 1; | |
4007 | ||
4008 | else if (GET_CODE (XEXP (x, 0)) == MEM) | |
4009 | { | |
4010 | /* If we have a (addressof (mem ..)), do any instantiation inside | |
4011 | since we know we'll be making the inside valid when we finally | |
4012 | remove the ADDRESSOF. */ | |
4013 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), NULL_RTX, 0); | |
4014 | return 1; | |
4015 | } | |
4016 | break; | |
4017 | ||
4018 | default: | |
4019 | break; | |
6f086dfc RS |
4020 | } |
4021 | ||
4022 | /* Scan all subexpressions. */ | |
4023 | fmt = GET_RTX_FORMAT (code); | |
4024 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
4025 | if (*fmt == 'e') | |
4026 | { | |
4027 | if (!instantiate_virtual_regs_1 (&XEXP (x, i), object, extra_insns)) | |
4028 | return 0; | |
4029 | } | |
4030 | else if (*fmt == 'E') | |
4031 | for (j = 0; j < XVECLEN (x, i); j++) | |
4032 | if (! instantiate_virtual_regs_1 (&XVECEXP (x, i, j), object, | |
4033 | extra_insns)) | |
4034 | return 0; | |
4035 | ||
4036 | return 1; | |
4037 | } | |
4038 | \f | |
4039 | /* Optimization: assuming this function does not receive nonlocal gotos, | |
4040 | delete the handlers for such, as well as the insns to establish | |
4041 | and disestablish them. */ | |
4042 | ||
4043 | static void | |
4044 | delete_handlers () | |
4045 | { | |
4046 | rtx insn; | |
4047 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
4048 | { | |
4049 | /* Delete the handler by turning off the flag that would | |
4050 | prevent jump_optimize from deleting it. | |
4051 | Also permit deletion of the nonlocal labels themselves | |
4052 | if nothing local refers to them. */ | |
4053 | if (GET_CODE (insn) == CODE_LABEL) | |
71cd4a8d JW |
4054 | { |
4055 | tree t, last_t; | |
4056 | ||
4057 | LABEL_PRESERVE_P (insn) = 0; | |
4058 | ||
4059 | /* Remove it from the nonlocal_label list, to avoid confusing | |
4060 | flow. */ | |
4061 | for (t = nonlocal_labels, last_t = 0; t; | |
4062 | last_t = t, t = TREE_CHAIN (t)) | |
4063 | if (DECL_RTL (TREE_VALUE (t)) == insn) | |
4064 | break; | |
4065 | if (t) | |
4066 | { | |
4067 | if (! last_t) | |
4068 | nonlocal_labels = TREE_CHAIN (nonlocal_labels); | |
4069 | else | |
4070 | TREE_CHAIN (last_t) = TREE_CHAIN (t); | |
4071 | } | |
4072 | } | |
ba716ac9 BS |
4073 | if (GET_CODE (insn) == INSN) |
4074 | { | |
4075 | int can_delete = 0; | |
4076 | rtx t; | |
4077 | for (t = nonlocal_goto_handler_slots; t != 0; t = XEXP (t, 1)) | |
4078 | if (reg_mentioned_p (t, PATTERN (insn))) | |
4079 | { | |
4080 | can_delete = 1; | |
4081 | break; | |
4082 | } | |
4083 | if (can_delete | |
59257ff7 RK |
4084 | || (nonlocal_goto_stack_level != 0 |
4085 | && reg_mentioned_p (nonlocal_goto_stack_level, | |
ba716ac9 BS |
4086 | PATTERN (insn)))) |
4087 | delete_insn (insn); | |
4088 | } | |
6f086dfc RS |
4089 | } |
4090 | } | |
6f086dfc RS |
4091 | \f |
4092 | /* Output a USE for any register use in RTL. | |
4093 | This is used with -noreg to mark the extent of lifespan | |
4094 | of any registers used in a user-visible variable's DECL_RTL. */ | |
4095 | ||
4096 | void | |
4097 | use_variable (rtl) | |
4098 | rtx rtl; | |
4099 | { | |
4100 | if (GET_CODE (rtl) == REG) | |
4101 | /* This is a register variable. */ | |
38a448ca | 4102 | emit_insn (gen_rtx_USE (VOIDmode, rtl)); |
6f086dfc RS |
4103 | else if (GET_CODE (rtl) == MEM |
4104 | && GET_CODE (XEXP (rtl, 0)) == REG | |
4105 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
4106 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
4107 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
4108 | /* This is a variable-sized structure. */ | |
38a448ca | 4109 | emit_insn (gen_rtx_USE (VOIDmode, XEXP (rtl, 0))); |
6f086dfc RS |
4110 | } |
4111 | ||
4112 | /* Like use_variable except that it outputs the USEs after INSN | |
4113 | instead of at the end of the insn-chain. */ | |
4114 | ||
4115 | void | |
4116 | use_variable_after (rtl, insn) | |
4117 | rtx rtl, insn; | |
4118 | { | |
4119 | if (GET_CODE (rtl) == REG) | |
4120 | /* This is a register variable. */ | |
38a448ca | 4121 | emit_insn_after (gen_rtx_USE (VOIDmode, rtl), insn); |
6f086dfc RS |
4122 | else if (GET_CODE (rtl) == MEM |
4123 | && GET_CODE (XEXP (rtl, 0)) == REG | |
4124 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
4125 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
4126 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
4127 | /* This is a variable-sized structure. */ | |
38a448ca | 4128 | emit_insn_after (gen_rtx_USE (VOIDmode, XEXP (rtl, 0)), insn); |
6f086dfc RS |
4129 | } |
4130 | \f | |
4131 | int | |
4132 | max_parm_reg_num () | |
4133 | { | |
4134 | return max_parm_reg; | |
4135 | } | |
4136 | ||
4137 | /* Return the first insn following those generated by `assign_parms'. */ | |
4138 | ||
4139 | rtx | |
4140 | get_first_nonparm_insn () | |
4141 | { | |
4142 | if (last_parm_insn) | |
4143 | return NEXT_INSN (last_parm_insn); | |
4144 | return get_insns (); | |
4145 | } | |
4146 | ||
5378192b RS |
4147 | /* Return the first NOTE_INSN_BLOCK_BEG note in the function. |
4148 | Crash if there is none. */ | |
4149 | ||
4150 | rtx | |
4151 | get_first_block_beg () | |
4152 | { | |
4153 | register rtx searcher; | |
4154 | register rtx insn = get_first_nonparm_insn (); | |
4155 | ||
4156 | for (searcher = insn; searcher; searcher = NEXT_INSN (searcher)) | |
4157 | if (GET_CODE (searcher) == NOTE | |
4158 | && NOTE_LINE_NUMBER (searcher) == NOTE_INSN_BLOCK_BEG) | |
4159 | return searcher; | |
4160 | ||
4161 | abort (); /* Invalid call to this function. (See comments above.) */ | |
4162 | return NULL_RTX; | |
4163 | } | |
4164 | ||
d181c154 RS |
4165 | /* Return 1 if EXP is an aggregate type (or a value with aggregate type). |
4166 | This means a type for which function calls must pass an address to the | |
4167 | function or get an address back from the function. | |
4168 | EXP may be a type node or an expression (whose type is tested). */ | |
6f086dfc RS |
4169 | |
4170 | int | |
4171 | aggregate_value_p (exp) | |
4172 | tree exp; | |
4173 | { | |
9d790a4f RS |
4174 | int i, regno, nregs; |
4175 | rtx reg; | |
d181c154 RS |
4176 | tree type; |
4177 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 't') | |
4178 | type = exp; | |
4179 | else | |
4180 | type = TREE_TYPE (exp); | |
4181 | ||
4182 | if (RETURN_IN_MEMORY (type)) | |
6f086dfc | 4183 | return 1; |
956d6950 | 4184 | /* Types that are TREE_ADDRESSABLE must be constructed in memory, |
49a2e5b2 DE |
4185 | and thus can't be returned in registers. */ |
4186 | if (TREE_ADDRESSABLE (type)) | |
4187 | return 1; | |
05e3bdb9 | 4188 | if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type)) |
6f086dfc | 4189 | return 1; |
9d790a4f RS |
4190 | /* Make sure we have suitable call-clobbered regs to return |
4191 | the value in; if not, we must return it in memory. */ | |
d181c154 | 4192 | reg = hard_function_value (type, 0); |
e71f7aa5 JW |
4193 | |
4194 | /* If we have something other than a REG (e.g. a PARALLEL), then assume | |
4195 | it is OK. */ | |
4196 | if (GET_CODE (reg) != REG) | |
4197 | return 0; | |
4198 | ||
9d790a4f | 4199 | regno = REGNO (reg); |
d181c154 | 4200 | nregs = HARD_REGNO_NREGS (regno, TYPE_MODE (type)); |
9d790a4f RS |
4201 | for (i = 0; i < nregs; i++) |
4202 | if (! call_used_regs[regno + i]) | |
4203 | return 1; | |
6f086dfc RS |
4204 | return 0; |
4205 | } | |
4206 | \f | |
4207 | /* Assign RTL expressions to the function's parameters. | |
4208 | This may involve copying them into registers and using | |
4209 | those registers as the RTL for them. | |
4210 | ||
4211 | If SECOND_TIME is non-zero it means that this function is being | |
4212 | called a second time. This is done by integrate.c when a function's | |
4213 | compilation is deferred. We need to come back here in case the | |
4214 | FUNCTION_ARG macro computes items needed for the rest of the compilation | |
4215 | (such as changing which registers are fixed or caller-saved). But suppress | |
4216 | writing any insns or setting DECL_RTL of anything in this case. */ | |
4217 | ||
4218 | void | |
4219 | assign_parms (fndecl, second_time) | |
4220 | tree fndecl; | |
4221 | int second_time; | |
4222 | { | |
4223 | register tree parm; | |
4224 | register rtx entry_parm = 0; | |
4225 | register rtx stack_parm = 0; | |
4226 | CUMULATIVE_ARGS args_so_far; | |
621061f4 RK |
4227 | enum machine_mode promoted_mode, passed_mode; |
4228 | enum machine_mode nominal_mode, promoted_nominal_mode; | |
00d8a4c1 | 4229 | int unsignedp; |
6f086dfc RS |
4230 | /* Total space needed so far for args on the stack, |
4231 | given as a constant and a tree-expression. */ | |
4232 | struct args_size stack_args_size; | |
4233 | tree fntype = TREE_TYPE (fndecl); | |
4234 | tree fnargs = DECL_ARGUMENTS (fndecl); | |
4235 | /* This is used for the arg pointer when referring to stack args. */ | |
4236 | rtx internal_arg_pointer; | |
4237 | /* This is a dummy PARM_DECL that we used for the function result if | |
4238 | the function returns a structure. */ | |
4239 | tree function_result_decl = 0; | |
54ea1de9 | 4240 | #ifdef SETUP_INCOMING_VARARGS |
6f086dfc | 4241 | int varargs_setup = 0; |
54ea1de9 | 4242 | #endif |
3412b298 | 4243 | rtx conversion_insns = 0; |
6f086dfc RS |
4244 | |
4245 | /* Nonzero if the last arg is named `__builtin_va_alist', | |
4246 | which is used on some machines for old-fashioned non-ANSI varargs.h; | |
4247 | this should be stuck onto the stack as if it had arrived there. */ | |
3b69d50e RK |
4248 | int hide_last_arg |
4249 | = (current_function_varargs | |
4250 | && fnargs | |
6f086dfc RS |
4251 | && (parm = tree_last (fnargs)) != 0 |
4252 | && DECL_NAME (parm) | |
4253 | && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)), | |
4254 | "__builtin_va_alist"))); | |
4255 | ||
4256 | /* Nonzero if function takes extra anonymous args. | |
4257 | This means the last named arg must be on the stack | |
0f41302f | 4258 | right before the anonymous ones. */ |
6f086dfc RS |
4259 | int stdarg |
4260 | = (TYPE_ARG_TYPES (fntype) != 0 | |
4261 | && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
4262 | != void_type_node)); | |
4263 | ||
ebb904cb RK |
4264 | current_function_stdarg = stdarg; |
4265 | ||
6f086dfc RS |
4266 | /* If the reg that the virtual arg pointer will be translated into is |
4267 | not a fixed reg or is the stack pointer, make a copy of the virtual | |
4268 | arg pointer, and address parms via the copy. The frame pointer is | |
4269 | considered fixed even though it is not marked as such. | |
4270 | ||
4271 | The second time through, simply use ap to avoid generating rtx. */ | |
4272 | ||
4273 | if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM | |
4274 | || ! (fixed_regs[ARG_POINTER_REGNUM] | |
4275 | || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)) | |
4276 | && ! second_time) | |
4277 | internal_arg_pointer = copy_to_reg (virtual_incoming_args_rtx); | |
4278 | else | |
4279 | internal_arg_pointer = virtual_incoming_args_rtx; | |
4280 | current_function_internal_arg_pointer = internal_arg_pointer; | |
4281 | ||
4282 | stack_args_size.constant = 0; | |
4283 | stack_args_size.var = 0; | |
4284 | ||
4285 | /* If struct value address is treated as the first argument, make it so. */ | |
4286 | if (aggregate_value_p (DECL_RESULT (fndecl)) | |
4287 | && ! current_function_returns_pcc_struct | |
4288 | && struct_value_incoming_rtx == 0) | |
4289 | { | |
f9f29478 | 4290 | tree type = build_pointer_type (TREE_TYPE (fntype)); |
6f086dfc | 4291 | |
5f4f0e22 | 4292 | function_result_decl = build_decl (PARM_DECL, NULL_TREE, type); |
6f086dfc RS |
4293 | |
4294 | DECL_ARG_TYPE (function_result_decl) = type; | |
4295 | TREE_CHAIN (function_result_decl) = fnargs; | |
4296 | fnargs = function_result_decl; | |
4297 | } | |
4298 | ||
e9a25f70 JL |
4299 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; |
4300 | parm_reg_stack_loc = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
4301 | bzero ((char *) parm_reg_stack_loc, max_parm_reg * sizeof (rtx)); | |
6f086dfc RS |
4302 | |
4303 | #ifdef INIT_CUMULATIVE_INCOMING_ARGS | |
ea0d4c4b | 4304 | INIT_CUMULATIVE_INCOMING_ARGS (args_so_far, fntype, NULL_RTX); |
6f086dfc | 4305 | #else |
2c7ee1a6 | 4306 | INIT_CUMULATIVE_ARGS (args_so_far, fntype, NULL_RTX, 0); |
6f086dfc RS |
4307 | #endif |
4308 | ||
4309 | /* We haven't yet found an argument that we must push and pretend the | |
4310 | caller did. */ | |
4311 | current_function_pretend_args_size = 0; | |
4312 | ||
4313 | for (parm = fnargs; parm; parm = TREE_CHAIN (parm)) | |
4314 | { | |
05e3bdb9 | 4315 | int aggregate = AGGREGATE_TYPE_P (TREE_TYPE (parm)); |
6f086dfc RS |
4316 | struct args_size stack_offset; |
4317 | struct args_size arg_size; | |
4318 | int passed_pointer = 0; | |
621061f4 | 4319 | int did_conversion = 0; |
6f086dfc | 4320 | tree passed_type = DECL_ARG_TYPE (parm); |
621061f4 | 4321 | tree nominal_type = TREE_TYPE (parm); |
9ab70a9b | 4322 | int pretend_named; |
6f086dfc RS |
4323 | |
4324 | /* Set LAST_NAMED if this is last named arg before some | |
bf9c83fe | 4325 | anonymous args. */ |
6f086dfc RS |
4326 | int last_named = ((TREE_CHAIN (parm) == 0 |
4327 | || DECL_NAME (TREE_CHAIN (parm)) == 0) | |
3b69d50e | 4328 | && (stdarg || current_function_varargs)); |
bf9c83fe JW |
4329 | /* Set NAMED_ARG if this arg should be treated as a named arg. For |
4330 | most machines, if this is a varargs/stdarg function, then we treat | |
4331 | the last named arg as if it were anonymous too. */ | |
e5e809f4 | 4332 | int named_arg = STRICT_ARGUMENT_NAMING ? 1 : ! last_named; |
6f086dfc RS |
4333 | |
4334 | if (TREE_TYPE (parm) == error_mark_node | |
4335 | /* This can happen after weird syntax errors | |
4336 | or if an enum type is defined among the parms. */ | |
4337 | || TREE_CODE (parm) != PARM_DECL | |
4338 | || passed_type == NULL) | |
4339 | { | |
38a448ca RH |
4340 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) |
4341 | = gen_rtx_MEM (BLKmode, const0_rtx); | |
6f086dfc RS |
4342 | TREE_USED (parm) = 1; |
4343 | continue; | |
4344 | } | |
4345 | ||
4346 | /* For varargs.h function, save info about regs and stack space | |
4347 | used by the individual args, not including the va_alist arg. */ | |
3b69d50e | 4348 | if (hide_last_arg && last_named) |
6f086dfc RS |
4349 | current_function_args_info = args_so_far; |
4350 | ||
4351 | /* Find mode of arg as it is passed, and mode of arg | |
4352 | as it should be during execution of this function. */ | |
4353 | passed_mode = TYPE_MODE (passed_type); | |
621061f4 | 4354 | nominal_mode = TYPE_MODE (nominal_type); |
6f086dfc | 4355 | |
16bae307 RS |
4356 | /* If the parm's mode is VOID, its value doesn't matter, |
4357 | and avoid the usual things like emit_move_insn that could crash. */ | |
4358 | if (nominal_mode == VOIDmode) | |
4359 | { | |
4360 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) = const0_rtx; | |
4361 | continue; | |
4362 | } | |
4363 | ||
3f46679a RK |
4364 | /* If the parm is to be passed as a transparent union, use the |
4365 | type of the first field for the tests below. We have already | |
4366 | verified that the modes are the same. */ | |
4367 | if (DECL_TRANSPARENT_UNION (parm) | |
4368 | || TYPE_TRANSPARENT_UNION (passed_type)) | |
4369 | passed_type = TREE_TYPE (TYPE_FIELDS (passed_type)); | |
4370 | ||
a14ae508 RK |
4371 | /* See if this arg was passed by invisible reference. It is if |
4372 | it is an object whose size depends on the contents of the | |
4373 | object itself or if the machine requires these objects be passed | |
4374 | that way. */ | |
4375 | ||
4376 | if ((TREE_CODE (TYPE_SIZE (passed_type)) != INTEGER_CST | |
4377 | && contains_placeholder_p (TYPE_SIZE (passed_type))) | |
657bb6dc | 4378 | || TREE_ADDRESSABLE (passed_type) |
6f086dfc | 4379 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
a14ae508 | 4380 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, passed_mode, |
bf9c83fe | 4381 | passed_type, named_arg) |
a14ae508 RK |
4382 | #endif |
4383 | ) | |
6f086dfc | 4384 | { |
621061f4 | 4385 | passed_type = nominal_type = build_pointer_type (passed_type); |
6f086dfc RS |
4386 | passed_pointer = 1; |
4387 | passed_mode = nominal_mode = Pmode; | |
4388 | } | |
6f086dfc | 4389 | |
a53e14c0 RK |
4390 | promoted_mode = passed_mode; |
4391 | ||
4392 | #ifdef PROMOTE_FUNCTION_ARGS | |
4393 | /* Compute the mode in which the arg is actually extended to. */ | |
7940255d | 4394 | unsignedp = TREE_UNSIGNED (passed_type); |
a5a52dbc | 4395 | promoted_mode = promote_mode (passed_type, promoted_mode, &unsignedp, 1); |
a53e14c0 RK |
4396 | #endif |
4397 | ||
6f086dfc RS |
4398 | /* Let machine desc say which reg (if any) the parm arrives in. |
4399 | 0 means it arrives on the stack. */ | |
4400 | #ifdef FUNCTION_INCOMING_ARG | |
a53e14c0 | 4401 | entry_parm = FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4402 | passed_type, named_arg); |
6f086dfc | 4403 | #else |
a53e14c0 | 4404 | entry_parm = FUNCTION_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4405 | passed_type, named_arg); |
6f086dfc RS |
4406 | #endif |
4407 | ||
621061f4 RK |
4408 | if (entry_parm == 0) |
4409 | promoted_mode = passed_mode; | |
a53e14c0 | 4410 | |
6f086dfc RS |
4411 | #ifdef SETUP_INCOMING_VARARGS |
4412 | /* If this is the last named parameter, do any required setup for | |
4413 | varargs or stdargs. We need to know about the case of this being an | |
4414 | addressable type, in which case we skip the registers it | |
4415 | would have arrived in. | |
4416 | ||
4417 | For stdargs, LAST_NAMED will be set for two parameters, the one that | |
4418 | is actually the last named, and the dummy parameter. We only | |
4419 | want to do this action once. | |
4420 | ||
4421 | Also, indicate when RTL generation is to be suppressed. */ | |
4422 | if (last_named && !varargs_setup) | |
4423 | { | |
621061f4 | 4424 | SETUP_INCOMING_VARARGS (args_so_far, promoted_mode, passed_type, |
6f086dfc RS |
4425 | current_function_pretend_args_size, |
4426 | second_time); | |
4427 | varargs_setup = 1; | |
4428 | } | |
4429 | #endif | |
4430 | ||
4431 | /* Determine parm's home in the stack, | |
4432 | in case it arrives in the stack or we should pretend it did. | |
4433 | ||
4434 | Compute the stack position and rtx where the argument arrives | |
4435 | and its size. | |
4436 | ||
4437 | There is one complexity here: If this was a parameter that would | |
4438 | have been passed in registers, but wasn't only because it is | |
4439 | __builtin_va_alist, we want locate_and_pad_parm to treat it as if | |
4440 | it came in a register so that REG_PARM_STACK_SPACE isn't skipped. | |
4441 | In this case, we call FUNCTION_ARG with NAMED set to 1 instead of | |
4442 | 0 as it was the previous time. */ | |
4443 | ||
9ab70a9b | 4444 | pretend_named = named_arg || PRETEND_OUTGOING_VARARGS_NAMED; |
0f11903b | 4445 | locate_and_pad_parm (promoted_mode, passed_type, |
6f086dfc RS |
4446 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
4447 | 1, | |
4448 | #else | |
4449 | #ifdef FUNCTION_INCOMING_ARG | |
621061f4 | 4450 | FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
6f086dfc | 4451 | passed_type, |
9ab70a9b | 4452 | pretend_named) != 0, |
6f086dfc | 4453 | #else |
621061f4 | 4454 | FUNCTION_ARG (args_so_far, promoted_mode, |
6f086dfc | 4455 | passed_type, |
9ab70a9b | 4456 | pretend_named) != 0, |
6f086dfc RS |
4457 | #endif |
4458 | #endif | |
4459 | fndecl, &stack_args_size, &stack_offset, &arg_size); | |
4460 | ||
4461 | if (! second_time) | |
4462 | { | |
4463 | rtx offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4464 | ||
4465 | if (offset_rtx == const0_rtx) | |
0f11903b | 4466 | stack_parm = gen_rtx_MEM (promoted_mode, internal_arg_pointer); |
6f086dfc | 4467 | else |
0f11903b | 4468 | stack_parm = gen_rtx_MEM (promoted_mode, |
38a448ca RH |
4469 | gen_rtx_PLUS (Pmode, |
4470 | internal_arg_pointer, | |
4471 | offset_rtx)); | |
6f086dfc RS |
4472 | |
4473 | /* If this is a memory ref that contains aggregate components, | |
a00285d0 RK |
4474 | mark it as such for cse and loop optimize. Likewise if it |
4475 | is readonly. */ | |
c6df88cb | 4476 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
a00285d0 | 4477 | RTX_UNCHANGING_P (stack_parm) = TREE_READONLY (parm); |
41472af8 | 4478 | MEM_ALIAS_SET (stack_parm) = get_alias_set (parm); |
6f086dfc RS |
4479 | } |
4480 | ||
4481 | /* If this parameter was passed both in registers and in the stack, | |
4482 | use the copy on the stack. */ | |
621061f4 | 4483 | if (MUST_PASS_IN_STACK (promoted_mode, passed_type)) |
6f086dfc RS |
4484 | entry_parm = 0; |
4485 | ||
461beb10 | 4486 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
6f086dfc RS |
4487 | /* If this parm was passed part in regs and part in memory, |
4488 | pretend it arrived entirely in memory | |
4489 | by pushing the register-part onto the stack. | |
4490 | ||
4491 | In the special case of a DImode or DFmode that is split, | |
4492 | we could put it together in a pseudoreg directly, | |
4493 | but for now that's not worth bothering with. */ | |
4494 | ||
4495 | if (entry_parm) | |
4496 | { | |
621061f4 | 4497 | int nregs = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, promoted_mode, |
bf9c83fe | 4498 | passed_type, named_arg); |
6f086dfc RS |
4499 | |
4500 | if (nregs > 0) | |
4501 | { | |
4502 | current_function_pretend_args_size | |
4503 | = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / BITS_PER_UNIT) - 1) | |
4504 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
4505 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4506 | ||
4507 | if (! second_time) | |
5c4cdc9f JW |
4508 | { |
4509 | /* Handle calls that pass values in multiple non-contiguous | |
4510 | locations. The Irix 6 ABI has examples of this. */ | |
4511 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4512 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4513 | int_size_in_bytes (TREE_TYPE (parm)), | |
4514 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
4515 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
4516 | else |
4517 | move_block_from_reg (REGNO (entry_parm), | |
4518 | validize_mem (stack_parm), nregs, | |
4519 | int_size_in_bytes (TREE_TYPE (parm))); | |
4520 | } | |
6f086dfc RS |
4521 | entry_parm = stack_parm; |
4522 | } | |
4523 | } | |
461beb10 | 4524 | #endif |
6f086dfc RS |
4525 | |
4526 | /* If we didn't decide this parm came in a register, | |
4527 | by default it came on the stack. */ | |
4528 | if (entry_parm == 0) | |
4529 | entry_parm = stack_parm; | |
4530 | ||
4531 | /* Record permanently how this parm was passed. */ | |
4532 | if (! second_time) | |
4533 | DECL_INCOMING_RTL (parm) = entry_parm; | |
4534 | ||
4535 | /* If there is actually space on the stack for this parm, | |
4536 | count it in stack_args_size; otherwise set stack_parm to 0 | |
4537 | to indicate there is no preallocated stack slot for the parm. */ | |
4538 | ||
4539 | if (entry_parm == stack_parm | |
ab87f8c8 JL |
4540 | || (GET_CODE (entry_parm) == PARALLEL |
4541 | && XEXP (XVECEXP (entry_parm, 0, 0), 0) == NULL_RTX) | |
d9ca49d5 | 4542 | #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE) |
6f086dfc | 4543 | /* On some machines, even if a parm value arrives in a register |
d9ca49d5 JW |
4544 | there is still an (uninitialized) stack slot allocated for it. |
4545 | ||
4546 | ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell | |
4547 | whether this parameter already has a stack slot allocated, | |
4548 | because an arg block exists only if current_function_args_size | |
abc95ed3 | 4549 | is larger than some threshold, and we haven't calculated that |
d9ca49d5 JW |
4550 | yet. So, for now, we just assume that stack slots never exist |
4551 | in this case. */ | |
6f086dfc RS |
4552 | || REG_PARM_STACK_SPACE (fndecl) > 0 |
4553 | #endif | |
4554 | ) | |
4555 | { | |
4556 | stack_args_size.constant += arg_size.constant; | |
4557 | if (arg_size.var) | |
4558 | ADD_PARM_SIZE (stack_args_size, arg_size.var); | |
4559 | } | |
4560 | else | |
4561 | /* No stack slot was pushed for this parm. */ | |
4562 | stack_parm = 0; | |
4563 | ||
4564 | /* Update info on where next arg arrives in registers. */ | |
4565 | ||
621061f4 | 4566 | FUNCTION_ARG_ADVANCE (args_so_far, promoted_mode, |
bf9c83fe | 4567 | passed_type, named_arg); |
6f086dfc | 4568 | |
0f41302f | 4569 | /* If this is our second time through, we are done with this parm. */ |
6f086dfc RS |
4570 | if (second_time) |
4571 | continue; | |
4572 | ||
e16c591a RS |
4573 | /* If we can't trust the parm stack slot to be aligned enough |
4574 | for its ultimate type, don't use that slot after entry. | |
4575 | We'll make another stack slot, if we need one. */ | |
4576 | { | |
e16c591a | 4577 | int thisparm_boundary |
621061f4 | 4578 | = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type); |
e16c591a RS |
4579 | |
4580 | if (GET_MODE_ALIGNMENT (nominal_mode) > thisparm_boundary) | |
4581 | stack_parm = 0; | |
4582 | } | |
4583 | ||
cb61f66f RS |
4584 | /* If parm was passed in memory, and we need to convert it on entry, |
4585 | don't store it back in that same slot. */ | |
4586 | if (entry_parm != 0 | |
4587 | && nominal_mode != BLKmode && nominal_mode != passed_mode) | |
4588 | stack_parm = 0; | |
4589 | ||
4590 | #if 0 | |
6f086dfc RS |
4591 | /* Now adjust STACK_PARM to the mode and precise location |
4592 | where this parameter should live during execution, | |
4593 | if we discover that it must live in the stack during execution. | |
4594 | To make debuggers happier on big-endian machines, we store | |
4595 | the value in the last bytes of the space available. */ | |
4596 | ||
4597 | if (nominal_mode != BLKmode && nominal_mode != passed_mode | |
4598 | && stack_parm != 0) | |
4599 | { | |
4600 | rtx offset_rtx; | |
4601 | ||
f76b9db2 ILT |
4602 | if (BYTES_BIG_ENDIAN |
4603 | && GET_MODE_SIZE (nominal_mode) < UNITS_PER_WORD) | |
6f086dfc RS |
4604 | stack_offset.constant += (GET_MODE_SIZE (passed_mode) |
4605 | - GET_MODE_SIZE (nominal_mode)); | |
6f086dfc RS |
4606 | |
4607 | offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4608 | if (offset_rtx == const0_rtx) | |
38a448ca | 4609 | stack_parm = gen_rtx_MEM (nominal_mode, internal_arg_pointer); |
6f086dfc | 4610 | else |
38a448ca RH |
4611 | stack_parm = gen_rtx_MEM (nominal_mode, |
4612 | gen_rtx_PLUS (Pmode, | |
4613 | internal_arg_pointer, | |
4614 | offset_rtx)); | |
6f086dfc RS |
4615 | |
4616 | /* If this is a memory ref that contains aggregate components, | |
4617 | mark it as such for cse and loop optimize. */ | |
c6df88cb | 4618 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
6f086dfc | 4619 | } |
cb61f66f | 4620 | #endif /* 0 */ |
6f086dfc | 4621 | |
9dc0f531 RK |
4622 | #ifdef STACK_REGS |
4623 | /* We need this "use" info, because the gcc-register->stack-register | |
4624 | converter in reg-stack.c needs to know which registers are active | |
4625 | at the start of the function call. The actual parameter loading | |
4626 | instructions are not always available then anymore, since they might | |
4627 | have been optimised away. */ | |
4628 | ||
4629 | if (GET_CODE (entry_parm) == REG && !(hide_last_arg && last_named)) | |
38a448ca | 4630 | emit_insn (gen_rtx_USE (GET_MODE (entry_parm), entry_parm)); |
9dc0f531 RK |
4631 | #endif |
4632 | ||
6f086dfc RS |
4633 | /* ENTRY_PARM is an RTX for the parameter as it arrives, |
4634 | in the mode in which it arrives. | |
4635 | STACK_PARM is an RTX for a stack slot where the parameter can live | |
4636 | during the function (in case we want to put it there). | |
4637 | STACK_PARM is 0 if no stack slot was pushed for it. | |
4638 | ||
4639 | Now output code if necessary to convert ENTRY_PARM to | |
4640 | the type in which this function declares it, | |
4641 | and store that result in an appropriate place, | |
4642 | which may be a pseudo reg, may be STACK_PARM, | |
4643 | or may be a local stack slot if STACK_PARM is 0. | |
4644 | ||
4645 | Set DECL_RTL to that place. */ | |
4646 | ||
5c4cdc9f | 4647 | if (nominal_mode == BLKmode || GET_CODE (entry_parm) == PARALLEL) |
6f086dfc | 4648 | { |
5c4cdc9f JW |
4649 | /* If a BLKmode arrives in registers, copy it to a stack slot. |
4650 | Handle calls that pass values in multiple non-contiguous | |
4651 | locations. The Irix 6 ABI has examples of this. */ | |
4652 | if (GET_CODE (entry_parm) == REG | |
4653 | || GET_CODE (entry_parm) == PARALLEL) | |
6f086dfc | 4654 | { |
621061f4 RK |
4655 | int size_stored |
4656 | = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm)), | |
4657 | UNITS_PER_WORD); | |
6f086dfc RS |
4658 | |
4659 | /* Note that we will be storing an integral number of words. | |
4660 | So we have to be careful to ensure that we allocate an | |
4661 | integral number of words. We do this below in the | |
4662 | assign_stack_local if space was not allocated in the argument | |
4663 | list. If it was, this will not work if PARM_BOUNDARY is not | |
4664 | a multiple of BITS_PER_WORD. It isn't clear how to fix this | |
4665 | if it becomes a problem. */ | |
4666 | ||
4667 | if (stack_parm == 0) | |
7e41ffa2 RS |
4668 | { |
4669 | stack_parm | |
621061f4 RK |
4670 | = assign_stack_local (GET_MODE (entry_parm), |
4671 | size_stored, 0); | |
4672 | ||
4673 | /* If this is a memory ref that contains aggregate | |
4674 | components, mark it as such for cse and loop optimize. */ | |
c6df88cb | 4675 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
7e41ffa2 RS |
4676 | } |
4677 | ||
6f086dfc RS |
4678 | else if (PARM_BOUNDARY % BITS_PER_WORD != 0) |
4679 | abort (); | |
4680 | ||
7a30f0c4 JW |
4681 | if (TREE_READONLY (parm)) |
4682 | RTX_UNCHANGING_P (stack_parm) = 1; | |
4683 | ||
5c4cdc9f JW |
4684 | /* Handle calls that pass values in multiple non-contiguous |
4685 | locations. The Irix 6 ABI has examples of this. */ | |
4686 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4687 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4688 | int_size_in_bytes (TREE_TYPE (parm)), | |
4689 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
4690 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
4691 | else |
4692 | move_block_from_reg (REGNO (entry_parm), | |
4693 | validize_mem (stack_parm), | |
4694 | size_stored / UNITS_PER_WORD, | |
4695 | int_size_in_bytes (TREE_TYPE (parm))); | |
6f086dfc RS |
4696 | } |
4697 | DECL_RTL (parm) = stack_parm; | |
4698 | } | |
74bd77a8 | 4699 | else if (! ((obey_regdecls && ! DECL_REGISTER (parm) |
a82ad570 | 4700 | && ! DECL_INLINE (fndecl)) |
6f086dfc RS |
4701 | /* layout_decl may set this. */ |
4702 | || TREE_ADDRESSABLE (parm) | |
4703 | || TREE_SIDE_EFFECTS (parm) | |
4704 | /* If -ffloat-store specified, don't put explicit | |
4705 | float variables into registers. */ | |
4706 | || (flag_float_store | |
4707 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE)) | |
4708 | /* Always assign pseudo to structure return or item passed | |
4709 | by invisible reference. */ | |
4710 | || passed_pointer || parm == function_result_decl) | |
4711 | { | |
00d8a4c1 RK |
4712 | /* Store the parm in a pseudoregister during the function, but we |
4713 | may need to do it in a wider mode. */ | |
4714 | ||
4715 | register rtx parmreg; | |
4e86caed | 4716 | int regno, regnoi = 0, regnor = 0; |
00d8a4c1 RK |
4717 | |
4718 | unsignedp = TREE_UNSIGNED (TREE_TYPE (parm)); | |
cd5b3469 | 4719 | |
621061f4 RK |
4720 | promoted_nominal_mode |
4721 | = promote_mode (TREE_TYPE (parm), nominal_mode, &unsignedp, 0); | |
6f086dfc | 4722 | |
621061f4 | 4723 | parmreg = gen_reg_rtx (promoted_nominal_mode); |
ddb7361a | 4724 | mark_user_reg (parmreg); |
6f086dfc RS |
4725 | |
4726 | /* If this was an item that we received a pointer to, set DECL_RTL | |
4727 | appropriately. */ | |
4728 | if (passed_pointer) | |
4729 | { | |
621061f4 | 4730 | DECL_RTL (parm) |
38a448ca | 4731 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)), parmreg); |
c6df88cb | 4732 | MEM_SET_IN_STRUCT_P (DECL_RTL (parm), aggregate); |
6f086dfc RS |
4733 | } |
4734 | else | |
4735 | DECL_RTL (parm) = parmreg; | |
4736 | ||
4737 | /* Copy the value into the register. */ | |
621061f4 RK |
4738 | if (nominal_mode != passed_mode |
4739 | || promoted_nominal_mode != promoted_mode) | |
86f8eff3 | 4740 | { |
efd8cba0 | 4741 | int save_tree_used; |
621061f4 RK |
4742 | /* ENTRY_PARM has been converted to PROMOTED_MODE, its |
4743 | mode, by the caller. We now have to convert it to | |
4744 | NOMINAL_MODE, if different. However, PARMREG may be in | |
956d6950 | 4745 | a different mode than NOMINAL_MODE if it is being stored |
621061f4 RK |
4746 | promoted. |
4747 | ||
4748 | If ENTRY_PARM is a hard register, it might be in a register | |
86f8eff3 RK |
4749 | not valid for operating in its mode (e.g., an odd-numbered |
4750 | register for a DFmode). In that case, moves are the only | |
4751 | thing valid, so we can't do a convert from there. This | |
4752 | occurs when the calling sequence allow such misaligned | |
3412b298 JW |
4753 | usages. |
4754 | ||
4755 | In addition, the conversion may involve a call, which could | |
4756 | clobber parameters which haven't been copied to pseudo | |
4757 | registers yet. Therefore, we must first copy the parm to | |
4758 | a pseudo reg here, and save the conversion until after all | |
4759 | parameters have been moved. */ | |
4760 | ||
4761 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); | |
4762 | ||
4763 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
4764 | ||
4765 | push_to_sequence (conversion_insns); | |
ad241351 RK |
4766 | tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp); |
4767 | ||
efd8cba0 DB |
4768 | /* TREE_USED gets set erroneously during expand_assignment. */ |
4769 | save_tree_used = TREE_USED (parm); | |
621061f4 RK |
4770 | expand_assignment (parm, |
4771 | make_tree (nominal_type, tempreg), 0, 0); | |
efd8cba0 | 4772 | TREE_USED (parm) = save_tree_used; |
3412b298 | 4773 | conversion_insns = get_insns (); |
621061f4 | 4774 | did_conversion = 1; |
3412b298 | 4775 | end_sequence (); |
86f8eff3 | 4776 | } |
6f086dfc RS |
4777 | else |
4778 | emit_move_insn (parmreg, validize_mem (entry_parm)); | |
4779 | ||
74bd77a8 RS |
4780 | /* If we were passed a pointer but the actual value |
4781 | can safely live in a register, put it in one. */ | |
16bae307 | 4782 | if (passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode |
74bd77a8 RS |
4783 | && ! ((obey_regdecls && ! DECL_REGISTER (parm) |
4784 | && ! DECL_INLINE (fndecl)) | |
4785 | /* layout_decl may set this. */ | |
4786 | || TREE_ADDRESSABLE (parm) | |
4787 | || TREE_SIDE_EFFECTS (parm) | |
4788 | /* If -ffloat-store specified, don't put explicit | |
4789 | float variables into registers. */ | |
4790 | || (flag_float_store | |
4791 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE))) | |
4792 | { | |
2654605a JW |
4793 | /* We can't use nominal_mode, because it will have been set to |
4794 | Pmode above. We must use the actual mode of the parm. */ | |
4795 | parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); | |
ddb7361a | 4796 | mark_user_reg (parmreg); |
74bd77a8 RS |
4797 | emit_move_insn (parmreg, DECL_RTL (parm)); |
4798 | DECL_RTL (parm) = parmreg; | |
c110c53d RS |
4799 | /* STACK_PARM is the pointer, not the parm, and PARMREG is |
4800 | now the parm. */ | |
4801 | stack_parm = 0; | |
74bd77a8 | 4802 | } |
137a2a7b DE |
4803 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
4804 | /* If we are passed an arg by reference and it is our responsibility | |
4805 | to make a copy, do it now. | |
4806 | PASSED_TYPE and PASSED mode now refer to the pointer, not the | |
4807 | original argument, so we must recreate them in the call to | |
4808 | FUNCTION_ARG_CALLEE_COPIES. */ | |
4809 | /* ??? Later add code to handle the case that if the argument isn't | |
4810 | modified, don't do the copy. */ | |
4811 | ||
4812 | else if (passed_pointer | |
4813 | && FUNCTION_ARG_CALLEE_COPIES (args_so_far, | |
4814 | TYPE_MODE (DECL_ARG_TYPE (parm)), | |
4815 | DECL_ARG_TYPE (parm), | |
bf9c83fe | 4816 | named_arg) |
926b1b99 | 4817 | && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) |
137a2a7b DE |
4818 | { |
4819 | rtx copy; | |
4820 | tree type = DECL_ARG_TYPE (parm); | |
4821 | ||
4822 | /* This sequence may involve a library call perhaps clobbering | |
4823 | registers that haven't been copied to pseudos yet. */ | |
4824 | ||
4825 | push_to_sequence (conversion_insns); | |
4826 | ||
4827 | if (TYPE_SIZE (type) == 0 | |
4828 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
1fd3ef7f | 4829 | /* This is a variable sized object. */ |
38a448ca RH |
4830 | copy = gen_rtx_MEM (BLKmode, |
4831 | allocate_dynamic_stack_space | |
4832 | (expr_size (parm), NULL_RTX, | |
4833 | TYPE_ALIGN (type))); | |
137a2a7b | 4834 | else |
1fd3ef7f RK |
4835 | copy = assign_stack_temp (TYPE_MODE (type), |
4836 | int_size_in_bytes (type), 1); | |
c6df88cb | 4837 | MEM_SET_IN_STRUCT_P (copy, AGGREGATE_TYPE_P (type)); |
e9a25f70 | 4838 | RTX_UNCHANGING_P (copy) = TREE_READONLY (parm); |
137a2a7b DE |
4839 | |
4840 | store_expr (parm, copy, 0); | |
4841 | emit_move_insn (parmreg, XEXP (copy, 0)); | |
7d384cc0 | 4842 | if (current_function_check_memory_usage) |
86fa911a RK |
4843 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, |
4844 | XEXP (copy, 0), ptr_mode, | |
4845 | GEN_INT (int_size_in_bytes (type)), | |
4846 | TYPE_MODE (sizetype), | |
956d6950 JL |
4847 | GEN_INT (MEMORY_USE_RW), |
4848 | TYPE_MODE (integer_type_node)); | |
137a2a7b | 4849 | conversion_insns = get_insns (); |
621061f4 | 4850 | did_conversion = 1; |
137a2a7b DE |
4851 | end_sequence (); |
4852 | } | |
4853 | #endif /* FUNCTION_ARG_CALLEE_COPIES */ | |
74bd77a8 | 4854 | |
6f086dfc | 4855 | /* In any case, record the parm's desired stack location |
14aceb29 RS |
4856 | in case we later discover it must live in the stack. |
4857 | ||
4858 | If it is a COMPLEX value, store the stack location for both | |
4859 | halves. */ | |
4860 | ||
4861 | if (GET_CODE (parmreg) == CONCAT) | |
4862 | regno = MAX (REGNO (XEXP (parmreg, 0)), REGNO (XEXP (parmreg, 1))); | |
4863 | else | |
4864 | regno = REGNO (parmreg); | |
4865 | ||
e9a25f70 | 4866 | if (regno >= max_parm_reg) |
6f086dfc RS |
4867 | { |
4868 | rtx *new; | |
e9a25f70 | 4869 | int old_max_parm_reg = max_parm_reg; |
14aceb29 | 4870 | |
e9a25f70 JL |
4871 | /* It's slow to expand this one register at a time, |
4872 | but it's also rare and we need max_parm_reg to be | |
4873 | precisely correct. */ | |
4874 | max_parm_reg = regno + 1; | |
4875 | new = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
4c9a05bc | 4876 | bcopy ((char *) parm_reg_stack_loc, (char *) new, |
e9a25f70 JL |
4877 | old_max_parm_reg * sizeof (rtx)); |
4878 | bzero ((char *) (new + old_max_parm_reg), | |
4879 | (max_parm_reg - old_max_parm_reg) * sizeof (rtx)); | |
6f086dfc RS |
4880 | parm_reg_stack_loc = new; |
4881 | } | |
14aceb29 RS |
4882 | |
4883 | if (GET_CODE (parmreg) == CONCAT) | |
4884 | { | |
4885 | enum machine_mode submode = GET_MODE (XEXP (parmreg, 0)); | |
4886 | ||
a03caf76 RK |
4887 | regnor = REGNO (gen_realpart (submode, parmreg)); |
4888 | regnoi = REGNO (gen_imagpart (submode, parmreg)); | |
4889 | ||
7b1a0c14 RS |
4890 | if (stack_parm != 0) |
4891 | { | |
a03caf76 | 4892 | parm_reg_stack_loc[regnor] |
3d329b07 | 4893 | = gen_realpart (submode, stack_parm); |
a03caf76 | 4894 | parm_reg_stack_loc[regnoi] |
3d329b07 | 4895 | = gen_imagpart (submode, stack_parm); |
7b1a0c14 RS |
4896 | } |
4897 | else | |
4898 | { | |
a03caf76 RK |
4899 | parm_reg_stack_loc[regnor] = 0; |
4900 | parm_reg_stack_loc[regnoi] = 0; | |
7b1a0c14 | 4901 | } |
14aceb29 RS |
4902 | } |
4903 | else | |
4904 | parm_reg_stack_loc[REGNO (parmreg)] = stack_parm; | |
6f086dfc RS |
4905 | |
4906 | /* Mark the register as eliminable if we did no conversion | |
4907 | and it was copied from memory at a fixed offset, | |
4908 | and the arg pointer was not copied to a pseudo-reg. | |
4909 | If the arg pointer is a pseudo reg or the offset formed | |
4910 | an invalid address, such memory-equivalences | |
4911 | as we make here would screw up life analysis for it. */ | |
4912 | if (nominal_mode == passed_mode | |
621061f4 | 4913 | && ! did_conversion |
38b610ed ILT |
4914 | && stack_parm != 0 |
4915 | && GET_CODE (stack_parm) == MEM | |
6f086dfc RS |
4916 | && stack_offset.var == 0 |
4917 | && reg_mentioned_p (virtual_incoming_args_rtx, | |
38b610ed | 4918 | XEXP (stack_parm, 0))) |
a03caf76 RK |
4919 | { |
4920 | rtx linsn = get_last_insn (); | |
69685820 | 4921 | rtx sinsn, set; |
a03caf76 RK |
4922 | |
4923 | /* Mark complex types separately. */ | |
4924 | if (GET_CODE (parmreg) == CONCAT) | |
69685820 RK |
4925 | /* Scan backwards for the set of the real and |
4926 | imaginary parts. */ | |
4927 | for (sinsn = linsn; sinsn != 0; | |
4928 | sinsn = prev_nonnote_insn (sinsn)) | |
4929 | { | |
4930 | set = single_set (sinsn); | |
4931 | if (set != 0 | |
4932 | && SET_DEST (set) == regno_reg_rtx [regnoi]) | |
4933 | REG_NOTES (sinsn) | |
38a448ca RH |
4934 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4935 | parm_reg_stack_loc[regnoi], | |
4936 | REG_NOTES (sinsn)); | |
69685820 RK |
4937 | else if (set != 0 |
4938 | && SET_DEST (set) == regno_reg_rtx [regnor]) | |
4939 | REG_NOTES (sinsn) | |
38a448ca RH |
4940 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4941 | parm_reg_stack_loc[regnor], | |
4942 | REG_NOTES (sinsn)); | |
69685820 RK |
4943 | } |
4944 | else if ((set = single_set (linsn)) != 0 | |
4945 | && SET_DEST (set) == parmreg) | |
a03caf76 | 4946 | REG_NOTES (linsn) |
38a448ca RH |
4947 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4948 | stack_parm, REG_NOTES (linsn)); | |
a03caf76 | 4949 | } |
6f086dfc RS |
4950 | |
4951 | /* For pointer data type, suggest pointer register. */ | |
e5e809f4 | 4952 | if (POINTER_TYPE_P (TREE_TYPE (parm))) |
6c6166bd RK |
4953 | mark_reg_pointer (parmreg, |
4954 | (TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))) | |
4955 | / BITS_PER_UNIT)); | |
6f086dfc RS |
4956 | } |
4957 | else | |
4958 | { | |
4959 | /* Value must be stored in the stack slot STACK_PARM | |
4960 | during function execution. */ | |
4961 | ||
621061f4 | 4962 | if (promoted_mode != nominal_mode) |
86f8eff3 RK |
4963 | { |
4964 | /* Conversion is required. */ | |
3412b298 JW |
4965 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); |
4966 | ||
4967 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
86f8eff3 | 4968 | |
3412b298 JW |
4969 | push_to_sequence (conversion_insns); |
4970 | entry_parm = convert_to_mode (nominal_mode, tempreg, | |
a53e14c0 | 4971 | TREE_UNSIGNED (TREE_TYPE (parm))); |
de957303 DE |
4972 | if (stack_parm) |
4973 | { | |
4974 | /* ??? This may need a big-endian conversion on sparc64. */ | |
4975 | stack_parm = change_address (stack_parm, nominal_mode, | |
4976 | NULL_RTX); | |
4977 | } | |
3412b298 | 4978 | conversion_insns = get_insns (); |
621061f4 | 4979 | did_conversion = 1; |
3412b298 | 4980 | end_sequence (); |
86f8eff3 | 4981 | } |
6f086dfc RS |
4982 | |
4983 | if (entry_parm != stack_parm) | |
4984 | { | |
4985 | if (stack_parm == 0) | |
7e41ffa2 RS |
4986 | { |
4987 | stack_parm | |
4988 | = assign_stack_local (GET_MODE (entry_parm), | |
4989 | GET_MODE_SIZE (GET_MODE (entry_parm)), 0); | |
4990 | /* If this is a memory ref that contains aggregate components, | |
4991 | mark it as such for cse and loop optimize. */ | |
c6df88cb | 4992 | MEM_SET_IN_STRUCT_P (stack_parm, aggregate); |
7e41ffa2 RS |
4993 | } |
4994 | ||
621061f4 | 4995 | if (promoted_mode != nominal_mode) |
3412b298 JW |
4996 | { |
4997 | push_to_sequence (conversion_insns); | |
4998 | emit_move_insn (validize_mem (stack_parm), | |
4999 | validize_mem (entry_parm)); | |
5000 | conversion_insns = get_insns (); | |
5001 | end_sequence (); | |
5002 | } | |
5003 | else | |
5004 | emit_move_insn (validize_mem (stack_parm), | |
5005 | validize_mem (entry_parm)); | |
6f086dfc | 5006 | } |
7d384cc0 | 5007 | if (current_function_check_memory_usage) |
86fa911a RK |
5008 | { |
5009 | push_to_sequence (conversion_insns); | |
5010 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, | |
5011 | XEXP (stack_parm, 0), ptr_mode, | |
5012 | GEN_INT (GET_MODE_SIZE (GET_MODE | |
5013 | (entry_parm))), | |
5014 | TYPE_MODE (sizetype), | |
956d6950 JL |
5015 | GEN_INT (MEMORY_USE_RW), |
5016 | TYPE_MODE (integer_type_node)); | |
6f086dfc | 5017 | |
86fa911a RK |
5018 | conversion_insns = get_insns (); |
5019 | end_sequence (); | |
5020 | } | |
6f086dfc RS |
5021 | DECL_RTL (parm) = stack_parm; |
5022 | } | |
5023 | ||
5024 | /* If this "parameter" was the place where we are receiving the | |
5025 | function's incoming structure pointer, set up the result. */ | |
5026 | if (parm == function_result_decl) | |
ccdecf58 RK |
5027 | { |
5028 | tree result = DECL_RESULT (fndecl); | |
5029 | tree restype = TREE_TYPE (result); | |
5030 | ||
5031 | DECL_RTL (result) | |
38a448ca | 5032 | = gen_rtx_MEM (DECL_MODE (result), DECL_RTL (parm)); |
ccdecf58 | 5033 | |
c6df88cb MM |
5034 | MEM_SET_IN_STRUCT_P (DECL_RTL (result), |
5035 | AGGREGATE_TYPE_P (restype)); | |
ccdecf58 | 5036 | } |
6f086dfc RS |
5037 | |
5038 | if (TREE_THIS_VOLATILE (parm)) | |
5039 | MEM_VOLATILE_P (DECL_RTL (parm)) = 1; | |
5040 | if (TREE_READONLY (parm)) | |
5041 | RTX_UNCHANGING_P (DECL_RTL (parm)) = 1; | |
5042 | } | |
5043 | ||
3412b298 JW |
5044 | /* Output all parameter conversion instructions (possibly including calls) |
5045 | now that all parameters have been copied out of hard registers. */ | |
5046 | emit_insns (conversion_insns); | |
5047 | ||
6f086dfc RS |
5048 | last_parm_insn = get_last_insn (); |
5049 | ||
5050 | current_function_args_size = stack_args_size.constant; | |
5051 | ||
5052 | /* Adjust function incoming argument size for alignment and | |
5053 | minimum length. */ | |
5054 | ||
5055 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 5056 | #ifndef MAYBE_REG_PARM_STACK_SPACE |
6f086dfc RS |
5057 | current_function_args_size = MAX (current_function_args_size, |
5058 | REG_PARM_STACK_SPACE (fndecl)); | |
5059 | #endif | |
6f90e075 | 5060 | #endif |
6f086dfc | 5061 | |
6f086dfc RS |
5062 | #ifdef ARGS_GROW_DOWNWARD |
5063 | current_function_arg_offset_rtx | |
5f4f0e22 | 5064 | = (stack_args_size.var == 0 ? GEN_INT (-stack_args_size.constant) |
6f086dfc RS |
5065 | : expand_expr (size_binop (MINUS_EXPR, stack_args_size.var, |
5066 | size_int (-stack_args_size.constant)), | |
86fa911a | 5067 | NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD)); |
6f086dfc RS |
5068 | #else |
5069 | current_function_arg_offset_rtx = ARGS_SIZE_RTX (stack_args_size); | |
5070 | #endif | |
5071 | ||
5072 | /* See how many bytes, if any, of its args a function should try to pop | |
5073 | on return. */ | |
5074 | ||
64e6d9cc | 5075 | current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl), |
6f086dfc RS |
5076 | current_function_args_size); |
5077 | ||
3b69d50e RK |
5078 | /* For stdarg.h function, save info about |
5079 | regs and stack space used by the named args. */ | |
6f086dfc | 5080 | |
3b69d50e | 5081 | if (!hide_last_arg) |
6f086dfc RS |
5082 | current_function_args_info = args_so_far; |
5083 | ||
5084 | /* Set the rtx used for the function return value. Put this in its | |
5085 | own variable so any optimizers that need this information don't have | |
5086 | to include tree.h. Do this here so it gets done when an inlined | |
5087 | function gets output. */ | |
5088 | ||
5089 | current_function_return_rtx = DECL_RTL (DECL_RESULT (fndecl)); | |
5090 | } | |
5091 | \f | |
75dc3319 RK |
5092 | /* Indicate whether REGNO is an incoming argument to the current function |
5093 | that was promoted to a wider mode. If so, return the RTX for the | |
5094 | register (to get its mode). PMODE and PUNSIGNEDP are set to the mode | |
5095 | that REGNO is promoted from and whether the promotion was signed or | |
5096 | unsigned. */ | |
5097 | ||
5098 | #ifdef PROMOTE_FUNCTION_ARGS | |
5099 | ||
5100 | rtx | |
5101 | promoted_input_arg (regno, pmode, punsignedp) | |
5102 | int regno; | |
5103 | enum machine_mode *pmode; | |
5104 | int *punsignedp; | |
5105 | { | |
5106 | tree arg; | |
5107 | ||
5108 | for (arg = DECL_ARGUMENTS (current_function_decl); arg; | |
5109 | arg = TREE_CHAIN (arg)) | |
5110 | if (GET_CODE (DECL_INCOMING_RTL (arg)) == REG | |
621061f4 RK |
5111 | && REGNO (DECL_INCOMING_RTL (arg)) == regno |
5112 | && TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg))) | |
75dc3319 RK |
5113 | { |
5114 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg)); | |
5115 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (arg)); | |
5116 | ||
a5a52dbc | 5117 | mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1); |
75dc3319 RK |
5118 | if (mode == GET_MODE (DECL_INCOMING_RTL (arg)) |
5119 | && mode != DECL_MODE (arg)) | |
5120 | { | |
5121 | *pmode = DECL_MODE (arg); | |
5122 | *punsignedp = unsignedp; | |
5123 | return DECL_INCOMING_RTL (arg); | |
5124 | } | |
5125 | } | |
5126 | ||
5127 | return 0; | |
5128 | } | |
5129 | ||
5130 | #endif | |
5131 | \f | |
6f086dfc RS |
5132 | /* Compute the size and offset from the start of the stacked arguments for a |
5133 | parm passed in mode PASSED_MODE and with type TYPE. | |
5134 | ||
5135 | INITIAL_OFFSET_PTR points to the current offset into the stacked | |
5136 | arguments. | |
5137 | ||
5138 | The starting offset and size for this parm are returned in *OFFSET_PTR | |
5139 | and *ARG_SIZE_PTR, respectively. | |
5140 | ||
5141 | IN_REGS is non-zero if the argument will be passed in registers. It will | |
5142 | never be set if REG_PARM_STACK_SPACE is not defined. | |
5143 | ||
5144 | FNDECL is the function in which the argument was defined. | |
5145 | ||
5146 | There are two types of rounding that are done. The first, controlled by | |
5147 | FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument | |
5148 | list to be aligned to the specific boundary (in bits). This rounding | |
5149 | affects the initial and starting offsets, but not the argument size. | |
5150 | ||
5151 | The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY, | |
5152 | optionally rounds the size of the parm to PARM_BOUNDARY. The | |
5153 | initial offset is not affected by this rounding, while the size always | |
5154 | is and the starting offset may be. */ | |
5155 | ||
5156 | /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case; | |
5157 | initial_offset_ptr is positive because locate_and_pad_parm's | |
5158 | callers pass in the total size of args so far as | |
5159 | initial_offset_ptr. arg_size_ptr is always positive.*/ | |
5160 | ||
6f086dfc RS |
5161 | void |
5162 | locate_and_pad_parm (passed_mode, type, in_regs, fndecl, | |
5163 | initial_offset_ptr, offset_ptr, arg_size_ptr) | |
5164 | enum machine_mode passed_mode; | |
5165 | tree type; | |
5166 | int in_regs; | |
91813b28 | 5167 | tree fndecl ATTRIBUTE_UNUSED; |
6f086dfc RS |
5168 | struct args_size *initial_offset_ptr; |
5169 | struct args_size *offset_ptr; | |
5170 | struct args_size *arg_size_ptr; | |
5171 | { | |
5172 | tree sizetree | |
5173 | = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode)); | |
5174 | enum direction where_pad = FUNCTION_ARG_PADDING (passed_mode, type); | |
5175 | int boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type); | |
6f086dfc RS |
5176 | |
5177 | #ifdef REG_PARM_STACK_SPACE | |
5178 | /* If we have found a stack parm before we reach the end of the | |
5179 | area reserved for registers, skip that area. */ | |
5180 | if (! in_regs) | |
5181 | { | |
29a82058 JL |
5182 | int reg_parm_stack_space = 0; |
5183 | ||
29008b51 JW |
5184 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
5185 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
5186 | #else | |
6f086dfc | 5187 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
29008b51 | 5188 | #endif |
6f086dfc RS |
5189 | if (reg_parm_stack_space > 0) |
5190 | { | |
5191 | if (initial_offset_ptr->var) | |
5192 | { | |
5193 | initial_offset_ptr->var | |
5194 | = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr), | |
5195 | size_int (reg_parm_stack_space)); | |
5196 | initial_offset_ptr->constant = 0; | |
5197 | } | |
5198 | else if (initial_offset_ptr->constant < reg_parm_stack_space) | |
5199 | initial_offset_ptr->constant = reg_parm_stack_space; | |
5200 | } | |
5201 | } | |
5202 | #endif /* REG_PARM_STACK_SPACE */ | |
5203 | ||
5204 | arg_size_ptr->var = 0; | |
5205 | arg_size_ptr->constant = 0; | |
5206 | ||
5207 | #ifdef ARGS_GROW_DOWNWARD | |
5208 | if (initial_offset_ptr->var) | |
5209 | { | |
5210 | offset_ptr->constant = 0; | |
5211 | offset_ptr->var = size_binop (MINUS_EXPR, integer_zero_node, | |
5212 | initial_offset_ptr->var); | |
5213 | } | |
5214 | else | |
5215 | { | |
5216 | offset_ptr->constant = - initial_offset_ptr->constant; | |
5217 | offset_ptr->var = 0; | |
5218 | } | |
0b21dcf5 | 5219 | if (where_pad != none |
6f086dfc RS |
5220 | && (TREE_CODE (sizetree) != INTEGER_CST |
5221 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
5222 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5223 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
66bcbe19 TG |
5224 | if (where_pad != downward) |
5225 | pad_to_arg_alignment (offset_ptr, boundary); | |
6f086dfc RS |
5226 | if (initial_offset_ptr->var) |
5227 | { | |
5228 | arg_size_ptr->var = size_binop (MINUS_EXPR, | |
5229 | size_binop (MINUS_EXPR, | |
5230 | integer_zero_node, | |
5231 | initial_offset_ptr->var), | |
5232 | offset_ptr->var); | |
5233 | } | |
5234 | else | |
5235 | { | |
db3cf6fb MS |
5236 | arg_size_ptr->constant = (- initial_offset_ptr->constant |
5237 | - offset_ptr->constant); | |
6f086dfc | 5238 | } |
6f086dfc RS |
5239 | #else /* !ARGS_GROW_DOWNWARD */ |
5240 | pad_to_arg_alignment (initial_offset_ptr, boundary); | |
5241 | *offset_ptr = *initial_offset_ptr; | |
6f086dfc RS |
5242 | |
5243 | #ifdef PUSH_ROUNDING | |
5244 | if (passed_mode != BLKmode) | |
5245 | sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree))); | |
5246 | #endif | |
5247 | ||
d4b0a7a0 DE |
5248 | /* Pad_below needs the pre-rounded size to know how much to pad below |
5249 | so this must be done before rounding up. */ | |
ea5917da DE |
5250 | if (where_pad == downward |
5251 | /* However, BLKmode args passed in regs have their padding done elsewhere. | |
5252 | The stack slot must be able to hold the entire register. */ | |
5253 | && !(in_regs && passed_mode == BLKmode)) | |
d4b0a7a0 DE |
5254 | pad_below (offset_ptr, passed_mode, sizetree); |
5255 | ||
6f086dfc RS |
5256 | if (where_pad != none |
5257 | && (TREE_CODE (sizetree) != INTEGER_CST | |
5258 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
5259 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5260 | ||
5261 | ADD_PARM_SIZE (*arg_size_ptr, sizetree); | |
5262 | #endif /* ARGS_GROW_DOWNWARD */ | |
5263 | } | |
5264 | ||
e16c591a RS |
5265 | /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY. |
5266 | BOUNDARY is measured in bits, but must be a multiple of a storage unit. */ | |
5267 | ||
6f086dfc RS |
5268 | static void |
5269 | pad_to_arg_alignment (offset_ptr, boundary) | |
5270 | struct args_size *offset_ptr; | |
5271 | int boundary; | |
5272 | { | |
5273 | int boundary_in_bytes = boundary / BITS_PER_UNIT; | |
5274 | ||
5275 | if (boundary > BITS_PER_UNIT) | |
5276 | { | |
5277 | if (offset_ptr->var) | |
5278 | { | |
5279 | offset_ptr->var = | |
5280 | #ifdef ARGS_GROW_DOWNWARD | |
5281 | round_down | |
5282 | #else | |
5283 | round_up | |
5284 | #endif | |
5285 | (ARGS_SIZE_TREE (*offset_ptr), | |
5286 | boundary / BITS_PER_UNIT); | |
5287 | offset_ptr->constant = 0; /*?*/ | |
5288 | } | |
5289 | else | |
5290 | offset_ptr->constant = | |
5291 | #ifdef ARGS_GROW_DOWNWARD | |
5292 | FLOOR_ROUND (offset_ptr->constant, boundary_in_bytes); | |
5293 | #else | |
5294 | CEIL_ROUND (offset_ptr->constant, boundary_in_bytes); | |
5295 | #endif | |
5296 | } | |
5297 | } | |
5298 | ||
51723711 | 5299 | #ifndef ARGS_GROW_DOWNWARD |
6f086dfc RS |
5300 | static void |
5301 | pad_below (offset_ptr, passed_mode, sizetree) | |
5302 | struct args_size *offset_ptr; | |
5303 | enum machine_mode passed_mode; | |
5304 | tree sizetree; | |
5305 | { | |
5306 | if (passed_mode != BLKmode) | |
5307 | { | |
5308 | if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY) | |
5309 | offset_ptr->constant | |
5310 | += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1) | |
5311 | / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT) | |
5312 | - GET_MODE_SIZE (passed_mode)); | |
5313 | } | |
5314 | else | |
5315 | { | |
5316 | if (TREE_CODE (sizetree) != INTEGER_CST | |
5317 | || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY) | |
5318 | { | |
5319 | /* Round the size up to multiple of PARM_BOUNDARY bits. */ | |
5320 | tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5321 | /* Add it in. */ | |
5322 | ADD_PARM_SIZE (*offset_ptr, s2); | |
5323 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
5324 | } | |
5325 | } | |
5326 | } | |
51723711 | 5327 | #endif |
6f086dfc | 5328 | |
487a6e06 | 5329 | #ifdef ARGS_GROW_DOWNWARD |
6f086dfc RS |
5330 | static tree |
5331 | round_down (value, divisor) | |
5332 | tree value; | |
5333 | int divisor; | |
5334 | { | |
5335 | return size_binop (MULT_EXPR, | |
5336 | size_binop (FLOOR_DIV_EXPR, value, size_int (divisor)), | |
5337 | size_int (divisor)); | |
5338 | } | |
487a6e06 | 5339 | #endif |
6f086dfc RS |
5340 | \f |
5341 | /* Walk the tree of blocks describing the binding levels within a function | |
5342 | and warn about uninitialized variables. | |
5343 | This is done after calling flow_analysis and before global_alloc | |
5344 | clobbers the pseudo-regs to hard regs. */ | |
5345 | ||
5346 | void | |
5347 | uninitialized_vars_warning (block) | |
5348 | tree block; | |
5349 | { | |
5350 | register tree decl, sub; | |
5351 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5352 | { | |
5353 | if (TREE_CODE (decl) == VAR_DECL | |
5354 | /* These warnings are unreliable for and aggregates | |
5355 | because assigning the fields one by one can fail to convince | |
5356 | flow.c that the entire aggregate was initialized. | |
5357 | Unions are troublesome because members may be shorter. */ | |
05e3bdb9 | 5358 | && ! AGGREGATE_TYPE_P (TREE_TYPE (decl)) |
6f086dfc RS |
5359 | && DECL_RTL (decl) != 0 |
5360 | && GET_CODE (DECL_RTL (decl)) == REG | |
6acdd0fd JL |
5361 | /* Global optimizations can make it difficult to determine if a |
5362 | particular variable has been initialized. However, a VAR_DECL | |
5363 | with a nonzero DECL_INITIAL had an initializer, so do not | |
5364 | claim it is potentially uninitialized. | |
5365 | ||
5366 | We do not care about the actual value in DECL_INITIAL, so we do | |
5367 | not worry that it may be a dangling pointer. */ | |
5368 | && DECL_INITIAL (decl) == NULL_TREE | |
6f086dfc RS |
5369 | && regno_uninitialized (REGNO (DECL_RTL (decl)))) |
5370 | warning_with_decl (decl, | |
3c8cd8bd | 5371 | "`%s' might be used uninitialized in this function"); |
6f086dfc RS |
5372 | if (TREE_CODE (decl) == VAR_DECL |
5373 | && DECL_RTL (decl) != 0 | |
5374 | && GET_CODE (DECL_RTL (decl)) == REG | |
5375 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
5376 | warning_with_decl (decl, | |
3c8cd8bd | 5377 | "variable `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
5378 | } |
5379 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5380 | uninitialized_vars_warning (sub); | |
5381 | } | |
5382 | ||
5383 | /* Do the appropriate part of uninitialized_vars_warning | |
5384 | but for arguments instead of local variables. */ | |
5385 | ||
5386 | void | |
0cd6ef35 | 5387 | setjmp_args_warning () |
6f086dfc RS |
5388 | { |
5389 | register tree decl; | |
5390 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
5391 | decl; decl = TREE_CHAIN (decl)) | |
5392 | if (DECL_RTL (decl) != 0 | |
5393 | && GET_CODE (DECL_RTL (decl)) == REG | |
5394 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
3c8cd8bd | 5395 | warning_with_decl (decl, "argument `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
5396 | } |
5397 | ||
5398 | /* If this function call setjmp, put all vars into the stack | |
5399 | unless they were declared `register'. */ | |
5400 | ||
5401 | void | |
5402 | setjmp_protect (block) | |
5403 | tree block; | |
5404 | { | |
5405 | register tree decl, sub; | |
5406 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5407 | if ((TREE_CODE (decl) == VAR_DECL | |
5408 | || TREE_CODE (decl) == PARM_DECL) | |
5409 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5410 | && (GET_CODE (DECL_RTL (decl)) == REG |
5411 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5412 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
b335c2cc | 5413 | /* If this variable came from an inline function, it must be |
9ec36da5 | 5414 | that its life doesn't overlap the setjmp. If there was a |
b335c2cc TW |
5415 | setjmp in the function, it would already be in memory. We |
5416 | must exclude such variable because their DECL_RTL might be | |
5417 | set to strange things such as virtual_stack_vars_rtx. */ | |
5418 | && ! DECL_FROM_INLINE (decl) | |
6f086dfc RS |
5419 | && ( |
5420 | #ifdef NON_SAVING_SETJMP | |
5421 | /* If longjmp doesn't restore the registers, | |
5422 | don't put anything in them. */ | |
5423 | NON_SAVING_SETJMP | |
5424 | || | |
5425 | #endif | |
a82ad570 | 5426 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5427 | put_var_into_stack (decl); |
5428 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5429 | setjmp_protect (sub); | |
5430 | } | |
5431 | \f | |
5432 | /* Like the previous function, but for args instead of local variables. */ | |
5433 | ||
5434 | void | |
5435 | setjmp_protect_args () | |
5436 | { | |
29a82058 | 5437 | register tree decl; |
6f086dfc RS |
5438 | for (decl = DECL_ARGUMENTS (current_function_decl); |
5439 | decl; decl = TREE_CHAIN (decl)) | |
5440 | if ((TREE_CODE (decl) == VAR_DECL | |
5441 | || TREE_CODE (decl) == PARM_DECL) | |
5442 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5443 | && (GET_CODE (DECL_RTL (decl)) == REG |
5444 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5445 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
6f086dfc RS |
5446 | && ( |
5447 | /* If longjmp doesn't restore the registers, | |
5448 | don't put anything in them. */ | |
5449 | #ifdef NON_SAVING_SETJMP | |
5450 | NON_SAVING_SETJMP | |
5451 | || | |
5452 | #endif | |
a82ad570 | 5453 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5454 | put_var_into_stack (decl); |
5455 | } | |
5456 | \f | |
5457 | /* Return the context-pointer register corresponding to DECL, | |
5458 | or 0 if it does not need one. */ | |
5459 | ||
5460 | rtx | |
5461 | lookup_static_chain (decl) | |
5462 | tree decl; | |
5463 | { | |
b001a02f PB |
5464 | tree context = decl_function_context (decl); |
5465 | tree link; | |
7ad8c4bf | 5466 | |
38ee6ed9 JM |
5467 | if (context == 0 |
5468 | || (TREE_CODE (decl) == FUNCTION_DECL && DECL_NO_STATIC_CHAIN (decl))) | |
7ad8c4bf | 5469 | return 0; |
38ee6ed9 | 5470 | |
6f086dfc RS |
5471 | /* We treat inline_function_decl as an alias for the current function |
5472 | because that is the inline function whose vars, types, etc. | |
5473 | are being merged into the current function. | |
5474 | See expand_inline_function. */ | |
5475 | if (context == current_function_decl || context == inline_function_decl) | |
5476 | return virtual_stack_vars_rtx; | |
5477 | ||
5478 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5479 | if (TREE_PURPOSE (link) == context) | |
5480 | return RTL_EXPR_RTL (TREE_VALUE (link)); | |
5481 | ||
5482 | abort (); | |
5483 | } | |
5484 | \f | |
5485 | /* Convert a stack slot address ADDR for variable VAR | |
5486 | (from a containing function) | |
5487 | into an address valid in this function (using a static chain). */ | |
5488 | ||
5489 | rtx | |
5490 | fix_lexical_addr (addr, var) | |
5491 | rtx addr; | |
5492 | tree var; | |
5493 | { | |
5494 | rtx basereg; | |
e5e809f4 | 5495 | HOST_WIDE_INT displacement; |
6f086dfc RS |
5496 | tree context = decl_function_context (var); |
5497 | struct function *fp; | |
5498 | rtx base = 0; | |
5499 | ||
5500 | /* If this is the present function, we need not do anything. */ | |
5501 | if (context == current_function_decl || context == inline_function_decl) | |
5502 | return addr; | |
5503 | ||
5504 | for (fp = outer_function_chain; fp; fp = fp->next) | |
5505 | if (fp->decl == context) | |
5506 | break; | |
5507 | ||
5508 | if (fp == 0) | |
5509 | abort (); | |
5510 | ||
e9a25f70 JL |
5511 | if (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == MEM) |
5512 | addr = XEXP (XEXP (addr, 0), 0); | |
5513 | ||
6f086dfc RS |
5514 | /* Decode given address as base reg plus displacement. */ |
5515 | if (GET_CODE (addr) == REG) | |
5516 | basereg = addr, displacement = 0; | |
5517 | else if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
5518 | basereg = XEXP (addr, 0), displacement = INTVAL (XEXP (addr, 1)); | |
5519 | else | |
5520 | abort (); | |
5521 | ||
5522 | /* We accept vars reached via the containing function's | |
5523 | incoming arg pointer and via its stack variables pointer. */ | |
5524 | if (basereg == fp->internal_arg_pointer) | |
5525 | { | |
5526 | /* If reached via arg pointer, get the arg pointer value | |
5527 | out of that function's stack frame. | |
5528 | ||
5529 | There are two cases: If a separate ap is needed, allocate a | |
5530 | slot in the outer function for it and dereference it that way. | |
5531 | This is correct even if the real ap is actually a pseudo. | |
5532 | Otherwise, just adjust the offset from the frame pointer to | |
5533 | compensate. */ | |
5534 | ||
5535 | #ifdef NEED_SEPARATE_AP | |
5536 | rtx addr; | |
5537 | ||
5538 | if (fp->arg_pointer_save_area == 0) | |
5539 | fp->arg_pointer_save_area | |
5540 | = assign_outer_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0, fp); | |
5541 | ||
5542 | addr = fix_lexical_addr (XEXP (fp->arg_pointer_save_area, 0), var); | |
5543 | addr = memory_address (Pmode, addr); | |
5544 | ||
38a448ca | 5545 | base = copy_to_reg (gen_rtx_MEM (Pmode, addr)); |
6f086dfc RS |
5546 | #else |
5547 | displacement += (FIRST_PARM_OFFSET (context) - STARTING_FRAME_OFFSET); | |
86f8eff3 | 5548 | base = lookup_static_chain (var); |
6f086dfc RS |
5549 | #endif |
5550 | } | |
5551 | ||
5552 | else if (basereg == virtual_stack_vars_rtx) | |
5553 | { | |
5554 | /* This is the same code as lookup_static_chain, duplicated here to | |
5555 | avoid an extra call to decl_function_context. */ | |
5556 | tree link; | |
5557 | ||
5558 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5559 | if (TREE_PURPOSE (link) == context) | |
5560 | { | |
5561 | base = RTL_EXPR_RTL (TREE_VALUE (link)); | |
5562 | break; | |
5563 | } | |
5564 | } | |
5565 | ||
5566 | if (base == 0) | |
5567 | abort (); | |
5568 | ||
5569 | /* Use same offset, relative to appropriate static chain or argument | |
5570 | pointer. */ | |
5571 | return plus_constant (base, displacement); | |
5572 | } | |
5573 | \f | |
5574 | /* Return the address of the trampoline for entering nested fn FUNCTION. | |
5575 | If necessary, allocate a trampoline (in the stack frame) | |
5576 | and emit rtl to initialize its contents (at entry to this function). */ | |
5577 | ||
5578 | rtx | |
5579 | trampoline_address (function) | |
5580 | tree function; | |
5581 | { | |
5582 | tree link; | |
5583 | tree rtlexp; | |
5584 | rtx tramp; | |
5585 | struct function *fp; | |
5586 | tree fn_context; | |
5587 | ||
5588 | /* Find an existing trampoline and return it. */ | |
5589 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
5590 | if (TREE_PURPOSE (link) == function) | |
e87ee2a9 RK |
5591 | return |
5592 | round_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0)); | |
5593 | ||
6f086dfc RS |
5594 | for (fp = outer_function_chain; fp; fp = fp->next) |
5595 | for (link = fp->trampoline_list; link; link = TREE_CHAIN (link)) | |
5596 | if (TREE_PURPOSE (link) == function) | |
5597 | { | |
5598 | tramp = fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0), | |
5599 | function); | |
5600 | return round_trampoline_addr (tramp); | |
5601 | } | |
5602 | ||
5603 | /* None exists; we must make one. */ | |
5604 | ||
5605 | /* Find the `struct function' for the function containing FUNCTION. */ | |
5606 | fp = 0; | |
5607 | fn_context = decl_function_context (function); | |
4ac74fb8 RK |
5608 | if (fn_context != current_function_decl |
5609 | && fn_context != inline_function_decl) | |
6f086dfc RS |
5610 | for (fp = outer_function_chain; fp; fp = fp->next) |
5611 | if (fp->decl == fn_context) | |
5612 | break; | |
5613 | ||
5614 | /* Allocate run-time space for this trampoline | |
5615 | (usually in the defining function's stack frame). */ | |
5616 | #ifdef ALLOCATE_TRAMPOLINE | |
5617 | tramp = ALLOCATE_TRAMPOLINE (fp); | |
5618 | #else | |
5619 | /* If rounding needed, allocate extra space | |
5620 | to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */ | |
5621 | #ifdef TRAMPOLINE_ALIGNMENT | |
b02ab63a RK |
5622 | #define TRAMPOLINE_REAL_SIZE \ |
5623 | (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1) | |
6f086dfc RS |
5624 | #else |
5625 | #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE) | |
5626 | #endif | |
5627 | if (fp != 0) | |
5628 | tramp = assign_outer_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0, fp); | |
5629 | else | |
5630 | tramp = assign_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0); | |
5631 | #endif | |
5632 | ||
5633 | /* Record the trampoline for reuse and note it for later initialization | |
5634 | by expand_function_end. */ | |
5635 | if (fp != 0) | |
5636 | { | |
28498644 RK |
5637 | push_obstacks (fp->function_maybepermanent_obstack, |
5638 | fp->function_maybepermanent_obstack); | |
6f086dfc RS |
5639 | rtlexp = make_node (RTL_EXPR); |
5640 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5641 | fp->trampoline_list = tree_cons (function, rtlexp, fp->trampoline_list); | |
5642 | pop_obstacks (); | |
5643 | } | |
5644 | else | |
5645 | { | |
5646 | /* Make the RTL_EXPR node temporary, not momentary, so that the | |
5647 | trampoline_list doesn't become garbage. */ | |
5648 | int momentary = suspend_momentary (); | |
5649 | rtlexp = make_node (RTL_EXPR); | |
5650 | resume_momentary (momentary); | |
5651 | ||
5652 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5653 | trampoline_list = tree_cons (function, rtlexp, trampoline_list); | |
5654 | } | |
5655 | ||
5656 | tramp = fix_lexical_addr (XEXP (tramp, 0), function); | |
5657 | return round_trampoline_addr (tramp); | |
5658 | } | |
5659 | ||
5660 | /* Given a trampoline address, | |
5661 | round it to multiple of TRAMPOLINE_ALIGNMENT. */ | |
5662 | ||
5663 | static rtx | |
5664 | round_trampoline_addr (tramp) | |
5665 | rtx tramp; | |
5666 | { | |
5667 | #ifdef TRAMPOLINE_ALIGNMENT | |
5668 | /* Round address up to desired boundary. */ | |
5669 | rtx temp = gen_reg_rtx (Pmode); | |
5670 | temp = expand_binop (Pmode, add_optab, tramp, | |
b02ab63a | 5671 | GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1), |
6f086dfc RS |
5672 | temp, 0, OPTAB_LIB_WIDEN); |
5673 | tramp = expand_binop (Pmode, and_optab, temp, | |
b02ab63a | 5674 | GEN_INT (- TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT), |
6f086dfc RS |
5675 | temp, 0, OPTAB_LIB_WIDEN); |
5676 | #endif | |
5677 | return tramp; | |
5678 | } | |
5679 | \f | |
467456d0 RS |
5680 | /* The functions identify_blocks and reorder_blocks provide a way to |
5681 | reorder the tree of BLOCK nodes, for optimizers that reshuffle or | |
5682 | duplicate portions of the RTL code. Call identify_blocks before | |
5683 | changing the RTL, and call reorder_blocks after. */ | |
5684 | ||
b2a59b15 MS |
5685 | /* Put all this function's BLOCK nodes including those that are chained |
5686 | onto the first block into a vector, and return it. | |
467456d0 RS |
5687 | Also store in each NOTE for the beginning or end of a block |
5688 | the index of that block in the vector. | |
b2a59b15 | 5689 | The arguments are BLOCK, the chain of top-level blocks of the function, |
467456d0 RS |
5690 | and INSNS, the insn chain of the function. */ |
5691 | ||
5692 | tree * | |
b2a59b15 MS |
5693 | identify_blocks (block, insns) |
5694 | tree block; | |
467456d0 RS |
5695 | rtx insns; |
5696 | { | |
fc289cd1 JW |
5697 | int n_blocks; |
5698 | tree *block_vector; | |
5699 | int *block_stack; | |
467456d0 | 5700 | int depth = 0; |
b2a59b15 MS |
5701 | int next_block_number = 1; |
5702 | int current_block_number = 1; | |
467456d0 RS |
5703 | rtx insn; |
5704 | ||
b2a59b15 | 5705 | if (block == 0) |
fc289cd1 JW |
5706 | return 0; |
5707 | ||
b2a59b15 | 5708 | n_blocks = all_blocks (block, 0); |
fc289cd1 JW |
5709 | block_vector = (tree *) xmalloc (n_blocks * sizeof (tree)); |
5710 | block_stack = (int *) alloca (n_blocks * sizeof (int)); | |
5711 | ||
b2a59b15 | 5712 | all_blocks (block, block_vector); |
467456d0 RS |
5713 | |
5714 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
5715 | if (GET_CODE (insn) == NOTE) | |
5716 | { | |
5717 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5718 | { | |
5719 | block_stack[depth++] = current_block_number; | |
5720 | current_block_number = next_block_number; | |
1b2ac438 | 5721 | NOTE_BLOCK_NUMBER (insn) = next_block_number++; |
467456d0 RS |
5722 | } |
5723 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5724 | { | |
1b2ac438 | 5725 | NOTE_BLOCK_NUMBER (insn) = current_block_number; |
c7fdfd49 | 5726 | current_block_number = block_stack[--depth]; |
467456d0 RS |
5727 | } |
5728 | } | |
5729 | ||
b2a59b15 MS |
5730 | if (n_blocks != next_block_number) |
5731 | abort (); | |
5732 | ||
467456d0 RS |
5733 | return block_vector; |
5734 | } | |
5735 | ||
5736 | /* Given BLOCK_VECTOR which was returned by identify_blocks, | |
5737 | and a revised instruction chain, rebuild the tree structure | |
5738 | of BLOCK nodes to correspond to the new order of RTL. | |
fc289cd1 | 5739 | The new block tree is inserted below TOP_BLOCK. |
467456d0 RS |
5740 | Returns the current top-level block. */ |
5741 | ||
5742 | tree | |
b2a59b15 | 5743 | reorder_blocks (block_vector, block, insns) |
467456d0 | 5744 | tree *block_vector; |
b2a59b15 | 5745 | tree block; |
467456d0 RS |
5746 | rtx insns; |
5747 | { | |
b2a59b15 | 5748 | tree current_block = block; |
467456d0 RS |
5749 | rtx insn; |
5750 | ||
fc289cd1 | 5751 | if (block_vector == 0) |
b2a59b15 | 5752 | return block; |
fc289cd1 | 5753 | |
b2a59b15 | 5754 | /* Prune the old trees away, so that it doesn't get in the way. */ |
fc289cd1 | 5755 | BLOCK_SUBBLOCKS (current_block) = 0; |
b2a59b15 | 5756 | BLOCK_CHAIN (current_block) = 0; |
fc289cd1 | 5757 | |
467456d0 RS |
5758 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
5759 | if (GET_CODE (insn) == NOTE) | |
5760 | { | |
5761 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5762 | { | |
5763 | tree block = block_vector[NOTE_BLOCK_NUMBER (insn)]; | |
5764 | /* If we have seen this block before, copy it. */ | |
5765 | if (TREE_ASM_WRITTEN (block)) | |
5766 | block = copy_node (block); | |
fc289cd1 | 5767 | BLOCK_SUBBLOCKS (block) = 0; |
467456d0 RS |
5768 | TREE_ASM_WRITTEN (block) = 1; |
5769 | BLOCK_SUPERCONTEXT (block) = current_block; | |
5770 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block); | |
5771 | BLOCK_SUBBLOCKS (current_block) = block; | |
5772 | current_block = block; | |
1b2ac438 | 5773 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5774 | } |
5775 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5776 | { | |
5777 | BLOCK_SUBBLOCKS (current_block) | |
5778 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
5779 | current_block = BLOCK_SUPERCONTEXT (current_block); | |
1b2ac438 | 5780 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5781 | } |
5782 | } | |
5783 | ||
b2a59b15 MS |
5784 | BLOCK_SUBBLOCKS (current_block) |
5785 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
467456d0 RS |
5786 | return current_block; |
5787 | } | |
5788 | ||
5789 | /* Reverse the order of elements in the chain T of blocks, | |
5790 | and return the new head of the chain (old last element). */ | |
5791 | ||
5792 | static tree | |
5793 | blocks_nreverse (t) | |
5794 | tree t; | |
5795 | { | |
5796 | register tree prev = 0, decl, next; | |
5797 | for (decl = t; decl; decl = next) | |
5798 | { | |
5799 | next = BLOCK_CHAIN (decl); | |
5800 | BLOCK_CHAIN (decl) = prev; | |
5801 | prev = decl; | |
5802 | } | |
5803 | return prev; | |
5804 | } | |
5805 | ||
b2a59b15 MS |
5806 | /* Count the subblocks of the list starting with BLOCK, and list them |
5807 | all into the vector VECTOR. Also clear TREE_ASM_WRITTEN in all | |
5808 | blocks. */ | |
467456d0 RS |
5809 | |
5810 | static int | |
5811 | all_blocks (block, vector) | |
5812 | tree block; | |
5813 | tree *vector; | |
5814 | { | |
b2a59b15 MS |
5815 | int n_blocks = 0; |
5816 | ||
5817 | while (block) | |
5818 | { | |
5819 | TREE_ASM_WRITTEN (block) = 0; | |
5820 | ||
5821 | /* Record this block. */ | |
5822 | if (vector) | |
5823 | vector[n_blocks] = block; | |
5824 | ||
5825 | ++n_blocks; | |
5826 | ||
5827 | /* Record the subblocks, and their subblocks... */ | |
5828 | n_blocks += all_blocks (BLOCK_SUBBLOCKS (block), | |
5829 | vector ? vector + n_blocks : 0); | |
5830 | block = BLOCK_CHAIN (block); | |
5831 | } | |
467456d0 RS |
5832 | |
5833 | return n_blocks; | |
5834 | } | |
5835 | \f | |
6f086dfc RS |
5836 | /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node) |
5837 | and initialize static variables for generating RTL for the statements | |
5838 | of the function. */ | |
5839 | ||
5840 | void | |
5841 | init_function_start (subr, filename, line) | |
5842 | tree subr; | |
5843 | char *filename; | |
5844 | int line; | |
5845 | { | |
6f086dfc RS |
5846 | init_stmt_for_function (); |
5847 | ||
5848 | cse_not_expected = ! optimize; | |
5849 | ||
5850 | /* Caller save not needed yet. */ | |
5851 | caller_save_needed = 0; | |
5852 | ||
5853 | /* No stack slots have been made yet. */ | |
5854 | stack_slot_list = 0; | |
5855 | ||
5856 | /* There is no stack slot for handling nonlocal gotos. */ | |
ba716ac9 | 5857 | nonlocal_goto_handler_slots = 0; |
6f086dfc RS |
5858 | nonlocal_goto_stack_level = 0; |
5859 | ||
5860 | /* No labels have been declared for nonlocal use. */ | |
5861 | nonlocal_labels = 0; | |
e881bb1b | 5862 | nonlocal_goto_handler_labels = 0; |
6f086dfc RS |
5863 | |
5864 | /* No function calls so far in this function. */ | |
5865 | function_call_count = 0; | |
5866 | ||
5867 | /* No parm regs have been allocated. | |
5868 | (This is important for output_inline_function.) */ | |
5869 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; | |
5870 | ||
5871 | /* Initialize the RTL mechanism. */ | |
5872 | init_emit (); | |
5873 | ||
5874 | /* Initialize the queue of pending postincrement and postdecrements, | |
5875 | and some other info in expr.c. */ | |
5876 | init_expr (); | |
5877 | ||
5878 | /* We haven't done register allocation yet. */ | |
5879 | reg_renumber = 0; | |
5880 | ||
5881 | init_const_rtx_hash_table (); | |
5882 | ||
a1d7ffe3 | 5883 | current_function_name = (*decl_printable_name) (subr, 2); |
6f086dfc RS |
5884 | |
5885 | /* Nonzero if this is a nested function that uses a static chain. */ | |
5886 | ||
5887 | current_function_needs_context | |
38ee6ed9 JM |
5888 | = (decl_function_context (current_function_decl) != 0 |
5889 | && ! DECL_NO_STATIC_CHAIN (current_function_decl)); | |
6f086dfc RS |
5890 | |
5891 | /* Set if a call to setjmp is seen. */ | |
5892 | current_function_calls_setjmp = 0; | |
5893 | ||
5894 | /* Set if a call to longjmp is seen. */ | |
5895 | current_function_calls_longjmp = 0; | |
5896 | ||
5897 | current_function_calls_alloca = 0; | |
5898 | current_function_has_nonlocal_label = 0; | |
8634413a | 5899 | current_function_has_nonlocal_goto = 0; |
6f086dfc | 5900 | current_function_contains_functions = 0; |
54ff41b7 | 5901 | current_function_is_leaf = 0; |
fdb8a883 | 5902 | current_function_sp_is_unchanging = 0; |
54ff41b7 | 5903 | current_function_uses_only_leaf_regs = 0; |
acd693d1 | 5904 | current_function_has_computed_jump = 0; |
173cd503 | 5905 | current_function_is_thunk = 0; |
6f086dfc RS |
5906 | |
5907 | current_function_returns_pcc_struct = 0; | |
5908 | current_function_returns_struct = 0; | |
5909 | current_function_epilogue_delay_list = 0; | |
5910 | current_function_uses_const_pool = 0; | |
5911 | current_function_uses_pic_offset_table = 0; | |
aeb302bb | 5912 | current_function_cannot_inline = 0; |
6f086dfc RS |
5913 | |
5914 | /* We have not yet needed to make a label to jump to for tail-recursion. */ | |
5915 | tail_recursion_label = 0; | |
5916 | ||
5917 | /* We haven't had a need to make a save area for ap yet. */ | |
5918 | ||
5919 | arg_pointer_save_area = 0; | |
5920 | ||
5921 | /* No stack slots allocated yet. */ | |
5922 | frame_offset = 0; | |
5923 | ||
5924 | /* No SAVE_EXPRs in this function yet. */ | |
5925 | save_expr_regs = 0; | |
5926 | ||
5927 | /* No RTL_EXPRs in this function yet. */ | |
5928 | rtl_expr_chain = 0; | |
5929 | ||
bc0ebdf9 RK |
5930 | /* Set up to allocate temporaries. */ |
5931 | init_temp_slots (); | |
6f086dfc RS |
5932 | |
5933 | /* Within function body, compute a type's size as soon it is laid out. */ | |
5934 | immediate_size_expand++; | |
5935 | ||
d9a98e1a RK |
5936 | /* We haven't made any trampolines for this function yet. */ |
5937 | trampoline_list = 0; | |
5938 | ||
6f086dfc RS |
5939 | init_pending_stack_adjust (); |
5940 | inhibit_defer_pop = 0; | |
5941 | ||
5942 | current_function_outgoing_args_size = 0; | |
5943 | ||
6f086dfc | 5944 | /* Prevent ever trying to delete the first instruction of a function. |
b274104c PB |
5945 | Also tell final how to output a linenum before the function prologue. |
5946 | Note linenums could be missing, e.g. when compiling a Java .class file. */ | |
5947 | if (line > 0) | |
5948 | emit_line_note (filename, line); | |
6f086dfc RS |
5949 | |
5950 | /* Make sure first insn is a note even if we don't want linenums. | |
5951 | This makes sure the first insn will never be deleted. | |
5952 | Also, final expects a note to appear there. */ | |
5f4f0e22 | 5953 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5954 | |
5955 | /* Set flags used by final.c. */ | |
5956 | if (aggregate_value_p (DECL_RESULT (subr))) | |
5957 | { | |
5958 | #ifdef PCC_STATIC_STRUCT_RETURN | |
1b8297c1 | 5959 | current_function_returns_pcc_struct = 1; |
6f086dfc | 5960 | #endif |
1b8297c1 | 5961 | current_function_returns_struct = 1; |
6f086dfc RS |
5962 | } |
5963 | ||
5964 | /* Warn if this value is an aggregate type, | |
5965 | regardless of which calling convention we are using for it. */ | |
5966 | if (warn_aggregate_return | |
05e3bdb9 | 5967 | && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)))) |
6f086dfc RS |
5968 | warning ("function returns an aggregate"); |
5969 | ||
5970 | current_function_returns_pointer | |
8eda074c | 5971 | = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr))); |
6f086dfc RS |
5972 | |
5973 | /* Indicate that we need to distinguish between the return value of the | |
5974 | present function and the return value of a function being called. */ | |
5975 | rtx_equal_function_value_matters = 1; | |
5976 | ||
5977 | /* Indicate that we have not instantiated virtual registers yet. */ | |
5978 | virtuals_instantiated = 0; | |
5979 | ||
5980 | /* Indicate we have no need of a frame pointer yet. */ | |
5981 | frame_pointer_needed = 0; | |
5982 | ||
ebb904cb | 5983 | /* By default assume not varargs or stdarg. */ |
6f086dfc | 5984 | current_function_varargs = 0; |
ebb904cb | 5985 | current_function_stdarg = 0; |
6f086dfc RS |
5986 | } |
5987 | ||
5988 | /* Indicate that the current function uses extra args | |
5989 | not explicitly mentioned in the argument list in any fashion. */ | |
5990 | ||
5991 | void | |
5992 | mark_varargs () | |
5993 | { | |
5994 | current_function_varargs = 1; | |
5995 | } | |
5996 | ||
5997 | /* Expand a call to __main at the beginning of a possible main function. */ | |
5998 | ||
e2fd1d94 JM |
5999 | #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main) |
6000 | #undef HAS_INIT_SECTION | |
6001 | #define HAS_INIT_SECTION | |
6002 | #endif | |
6003 | ||
6f086dfc RS |
6004 | void |
6005 | expand_main_function () | |
6006 | { | |
e2fd1d94 | 6007 | #if !defined (HAS_INIT_SECTION) |
b93a436e JL |
6008 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, NAME__MAIN), 0, |
6009 | VOIDmode, 0); | |
e2fd1d94 | 6010 | #endif /* not HAS_INIT_SECTION */ |
6f086dfc RS |
6011 | } |
6012 | \f | |
c20bf1f3 JB |
6013 | extern struct obstack permanent_obstack; |
6014 | ||
6f086dfc RS |
6015 | /* Start the RTL for a new function, and set variables used for |
6016 | emitting RTL. | |
6017 | SUBR is the FUNCTION_DECL node. | |
6018 | PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with | |
6019 | the function's parameters, which must be run at any return statement. */ | |
6020 | ||
6021 | void | |
6022 | expand_function_start (subr, parms_have_cleanups) | |
6023 | tree subr; | |
6024 | int parms_have_cleanups; | |
6025 | { | |
6026 | register int i; | |
6027 | tree tem; | |
4e86caed | 6028 | rtx last_ptr = NULL_RTX; |
6f086dfc RS |
6029 | |
6030 | /* Make sure volatile mem refs aren't considered | |
6031 | valid operands of arithmetic insns. */ | |
6032 | init_recog_no_volatile (); | |
6033 | ||
7d384cc0 KR |
6034 | /* Set this before generating any memory accesses. */ |
6035 | current_function_check_memory_usage | |
6036 | = (flag_check_memory_usage | |
6037 | && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl)); | |
6038 | ||
07417085 KR |
6039 | current_function_instrument_entry_exit |
6040 | = (flag_instrument_function_entry_exit | |
6041 | && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr)); | |
6042 | ||
6f086dfc RS |
6043 | /* If function gets a static chain arg, store it in the stack frame. |
6044 | Do this first, so it gets the first stack slot offset. */ | |
6045 | if (current_function_needs_context) | |
3e2481e9 JW |
6046 | { |
6047 | last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
f0c51a1e | 6048 | |
f0c51a1e RK |
6049 | /* Delay copying static chain if it is not a register to avoid |
6050 | conflicts with regs used for parameters. */ | |
f95182a4 ILT |
6051 | if (! SMALL_REGISTER_CLASSES |
6052 | || GET_CODE (static_chain_incoming_rtx) == REG) | |
f0c51a1e | 6053 | emit_move_insn (last_ptr, static_chain_incoming_rtx); |
3e2481e9 | 6054 | } |
6f086dfc RS |
6055 | |
6056 | /* If the parameters of this function need cleaning up, get a label | |
6057 | for the beginning of the code which executes those cleanups. This must | |
6058 | be done before doing anything with return_label. */ | |
6059 | if (parms_have_cleanups) | |
6060 | cleanup_label = gen_label_rtx (); | |
6061 | else | |
6062 | cleanup_label = 0; | |
6063 | ||
6064 | /* Make the label for return statements to jump to, if this machine | |
6065 | does not have a one-instruction return and uses an epilogue, | |
6066 | or if it returns a structure, or if it has parm cleanups. */ | |
6067 | #ifdef HAVE_return | |
6068 | if (cleanup_label == 0 && HAVE_return | |
07417085 | 6069 | && ! current_function_instrument_entry_exit |
6f086dfc RS |
6070 | && ! current_function_returns_pcc_struct |
6071 | && ! (current_function_returns_struct && ! optimize)) | |
6072 | return_label = 0; | |
6073 | else | |
6074 | return_label = gen_label_rtx (); | |
6075 | #else | |
6076 | return_label = gen_label_rtx (); | |
6077 | #endif | |
6078 | ||
6079 | /* Initialize rtx used to return the value. */ | |
6080 | /* Do this before assign_parms so that we copy the struct value address | |
6081 | before any library calls that assign parms might generate. */ | |
6082 | ||
6083 | /* Decide whether to return the value in memory or in a register. */ | |
6084 | if (aggregate_value_p (DECL_RESULT (subr))) | |
6085 | { | |
6086 | /* Returning something that won't go in a register. */ | |
4acc00bf | 6087 | register rtx value_address = 0; |
6f086dfc RS |
6088 | |
6089 | #ifdef PCC_STATIC_STRUCT_RETURN | |
6090 | if (current_function_returns_pcc_struct) | |
6091 | { | |
6092 | int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr))); | |
6093 | value_address = assemble_static_space (size); | |
6094 | } | |
6095 | else | |
6096 | #endif | |
6097 | { | |
6098 | /* Expect to be passed the address of a place to store the value. | |
6099 | If it is passed as an argument, assign_parms will take care of | |
6100 | it. */ | |
6101 | if (struct_value_incoming_rtx) | |
6102 | { | |
6103 | value_address = gen_reg_rtx (Pmode); | |
6104 | emit_move_insn (value_address, struct_value_incoming_rtx); | |
6105 | } | |
6106 | } | |
6107 | if (value_address) | |
ccdecf58 RK |
6108 | { |
6109 | DECL_RTL (DECL_RESULT (subr)) | |
38a448ca | 6110 | = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address); |
c6df88cb MM |
6111 | MEM_SET_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr)), |
6112 | AGGREGATE_TYPE_P (TREE_TYPE | |
6113 | (DECL_RESULT | |
6114 | (subr)))); | |
ccdecf58 | 6115 | } |
6f086dfc RS |
6116 | } |
6117 | else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode) | |
6118 | /* If return mode is void, this decl rtl should not be used. */ | |
6119 | DECL_RTL (DECL_RESULT (subr)) = 0; | |
07417085 | 6120 | else if (parms_have_cleanups || current_function_instrument_entry_exit) |
a53e14c0 RK |
6121 | { |
6122 | /* If function will end with cleanup code for parms, | |
6123 | compute the return values into a pseudo reg, | |
6124 | which we will copy into the true return register | |
6125 | after the cleanups are done. */ | |
6126 | ||
6127 | enum machine_mode mode = DECL_MODE (DECL_RESULT (subr)); | |
a5a52dbc | 6128 | |
a53e14c0 RK |
6129 | #ifdef PROMOTE_FUNCTION_RETURN |
6130 | tree type = TREE_TYPE (DECL_RESULT (subr)); | |
6131 | int unsignedp = TREE_UNSIGNED (type); | |
6132 | ||
a5a52dbc | 6133 | mode = promote_mode (type, mode, &unsignedp, 1); |
a53e14c0 RK |
6134 | #endif |
6135 | ||
6136 | DECL_RTL (DECL_RESULT (subr)) = gen_reg_rtx (mode); | |
6137 | } | |
6f086dfc RS |
6138 | else |
6139 | /* Scalar, returned in a register. */ | |
6140 | { | |
6141 | #ifdef FUNCTION_OUTGOING_VALUE | |
6142 | DECL_RTL (DECL_RESULT (subr)) | |
6143 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
6144 | #else | |
6145 | DECL_RTL (DECL_RESULT (subr)) | |
6146 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
6147 | #endif | |
6148 | ||
6149 | /* Mark this reg as the function's return value. */ | |
6150 | if (GET_CODE (DECL_RTL (DECL_RESULT (subr))) == REG) | |
6151 | { | |
6152 | REG_FUNCTION_VALUE_P (DECL_RTL (DECL_RESULT (subr))) = 1; | |
6153 | /* Needed because we may need to move this to memory | |
6154 | in case it's a named return value whose address is taken. */ | |
a82ad570 | 6155 | DECL_REGISTER (DECL_RESULT (subr)) = 1; |
6f086dfc RS |
6156 | } |
6157 | } | |
6158 | ||
6159 | /* Initialize rtx for parameters and local variables. | |
6160 | In some cases this requires emitting insns. */ | |
6161 | ||
6162 | assign_parms (subr, 0); | |
6163 | ||
f0c51a1e RK |
6164 | /* Copy the static chain now if it wasn't a register. The delay is to |
6165 | avoid conflicts with the parameter passing registers. */ | |
6166 | ||
f95182a4 | 6167 | if (SMALL_REGISTER_CLASSES && current_function_needs_context) |
f0c51a1e RK |
6168 | if (GET_CODE (static_chain_incoming_rtx) != REG) |
6169 | emit_move_insn (last_ptr, static_chain_incoming_rtx); | |
f0c51a1e | 6170 | |
6f086dfc RS |
6171 | /* The following was moved from init_function_start. |
6172 | The move is supposed to make sdb output more accurate. */ | |
6173 | /* Indicate the beginning of the function body, | |
6174 | as opposed to parm setup. */ | |
5f4f0e22 | 6175 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_BEG); |
6f086dfc RS |
6176 | |
6177 | /* If doing stupid allocation, mark parms as born here. */ | |
6178 | ||
6179 | if (GET_CODE (get_last_insn ()) != NOTE) | |
5f4f0e22 | 6180 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
6181 | parm_birth_insn = get_last_insn (); |
6182 | ||
6183 | if (obey_regdecls) | |
6184 | { | |
6185 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
6186 | use_variable (regno_reg_rtx[i]); | |
6187 | ||
6188 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
6189 | use_variable (current_function_internal_arg_pointer); | |
6190 | } | |
6191 | ||
6d7306f7 JM |
6192 | context_display = 0; |
6193 | if (current_function_needs_context) | |
ac9e20f0 | 6194 | { |
6d7306f7 JM |
6195 | /* Fetch static chain values for containing functions. */ |
6196 | tem = decl_function_context (current_function_decl); | |
6197 | /* If not doing stupid register allocation copy the static chain | |
6198 | pointer into a pseudo. If we have small register classes, copy | |
6199 | the value from memory if static_chain_incoming_rtx is a REG. If | |
6200 | we do stupid register allocation, we use the stack address | |
6201 | generated above. */ | |
6202 | if (tem && ! obey_regdecls) | |
6203 | { | |
6d7306f7 JM |
6204 | /* If the static chain originally came in a register, put it back |
6205 | there, then move it out in the next insn. The reason for | |
6206 | this peculiar code is to satisfy function integration. */ | |
f95182a4 ILT |
6207 | if (SMALL_REGISTER_CLASSES |
6208 | && GET_CODE (static_chain_incoming_rtx) == REG) | |
6d7306f7 | 6209 | emit_move_insn (static_chain_incoming_rtx, last_ptr); |
6d7306f7 JM |
6210 | last_ptr = copy_to_reg (static_chain_incoming_rtx); |
6211 | } | |
ac9e20f0 | 6212 | |
6d7306f7 JM |
6213 | while (tem) |
6214 | { | |
6215 | tree rtlexp = make_node (RTL_EXPR); | |
6f086dfc | 6216 | |
6d7306f7 JM |
6217 | RTL_EXPR_RTL (rtlexp) = last_ptr; |
6218 | context_display = tree_cons (tem, rtlexp, context_display); | |
6219 | tem = decl_function_context (tem); | |
6220 | if (tem == 0) | |
6221 | break; | |
6222 | /* Chain thru stack frames, assuming pointer to next lexical frame | |
6223 | is found at the place we always store it. */ | |
6f086dfc | 6224 | #ifdef FRAME_GROWS_DOWNWARD |
6d7306f7 | 6225 | last_ptr = plus_constant (last_ptr, - GET_MODE_SIZE (Pmode)); |
6f086dfc | 6226 | #endif |
38a448ca RH |
6227 | last_ptr = copy_to_reg (gen_rtx_MEM (Pmode, |
6228 | memory_address (Pmode, last_ptr))); | |
6d7306f7 JM |
6229 | |
6230 | /* If we are not optimizing, ensure that we know that this | |
6231 | piece of context is live over the entire function. */ | |
6232 | if (! optimize) | |
38a448ca RH |
6233 | save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, last_ptr, |
6234 | save_expr_regs); | |
6d7306f7 | 6235 | } |
6f086dfc RS |
6236 | } |
6237 | ||
07417085 KR |
6238 | if (current_function_instrument_entry_exit) |
6239 | { | |
6240 | rtx fun = DECL_RTL (current_function_decl); | |
6241 | if (GET_CODE (fun) == MEM) | |
6242 | fun = XEXP (fun, 0); | |
6243 | else | |
6244 | abort (); | |
6245 | emit_library_call (profile_function_entry_libfunc, 0, VOIDmode, 2, | |
6246 | fun, Pmode, | |
6247 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
6248 | 0, | |
6249 | hard_frame_pointer_rtx), | |
6250 | Pmode); | |
6251 | } | |
6252 | ||
6f086dfc RS |
6253 | /* After the display initializations is where the tail-recursion label |
6254 | should go, if we end up needing one. Ensure we have a NOTE here | |
6255 | since some things (like trampolines) get placed before this. */ | |
5f4f0e22 | 6256 | tail_recursion_reentry = emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
6257 | |
6258 | /* Evaluate now the sizes of any types declared among the arguments. */ | |
6259 | for (tem = nreverse (get_pending_sizes ()); tem; tem = TREE_CHAIN (tem)) | |
7b05e286 | 6260 | { |
86fa911a RK |
6261 | expand_expr (TREE_VALUE (tem), const0_rtx, VOIDmode, |
6262 | EXPAND_MEMORY_USE_BAD); | |
7b05e286 JW |
6263 | /* Flush the queue in case this parameter declaration has |
6264 | side-effects. */ | |
6265 | emit_queue (); | |
6266 | } | |
6f086dfc RS |
6267 | |
6268 | /* Make sure there is a line number after the function entry setup code. */ | |
6269 | force_next_line_note (); | |
6270 | } | |
6271 | \f | |
6272 | /* Generate RTL for the end of the current function. | |
980697fd | 6273 | FILENAME and LINE are the current position in the source file. |
6f086dfc | 6274 | |
980697fd | 6275 | It is up to language-specific callers to do cleanups for parameters-- |
1be07046 | 6276 | or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */ |
6f086dfc RS |
6277 | |
6278 | void | |
1be07046 | 6279 | expand_function_end (filename, line, end_bindings) |
6f086dfc RS |
6280 | char *filename; |
6281 | int line; | |
1be07046 | 6282 | int end_bindings; |
6f086dfc RS |
6283 | { |
6284 | register int i; | |
6285 | tree link; | |
6286 | ||
1e2414db | 6287 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc | 6288 | static rtx initial_trampoline; |
1e2414db | 6289 | #endif |
6f086dfc RS |
6290 | |
6291 | #ifdef NON_SAVING_SETJMP | |
6292 | /* Don't put any variables in registers if we call setjmp | |
6293 | on a machine that fails to restore the registers. */ | |
6294 | if (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
6295 | { | |
b88a3142 RK |
6296 | if (DECL_INITIAL (current_function_decl) != error_mark_node) |
6297 | setjmp_protect (DECL_INITIAL (current_function_decl)); | |
6298 | ||
6f086dfc RS |
6299 | setjmp_protect_args (); |
6300 | } | |
6301 | #endif | |
6302 | ||
6303 | /* Save the argument pointer if a save area was made for it. */ | |
6304 | if (arg_pointer_save_area) | |
6305 | { | |
ea0f9a85 JW |
6306 | /* arg_pointer_save_area may not be a valid memory address, so we |
6307 | have to check it and fix it if necessary. */ | |
6308 | rtx seq; | |
6309 | start_sequence (); | |
6310 | emit_move_insn (validize_mem (arg_pointer_save_area), | |
6311 | virtual_incoming_args_rtx); | |
6312 | seq = gen_sequence (); | |
6313 | end_sequence (); | |
6314 | emit_insn_before (seq, tail_recursion_reentry); | |
6f086dfc RS |
6315 | } |
6316 | ||
6317 | /* Initialize any trampolines required by this function. */ | |
6318 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
6319 | { | |
6320 | tree function = TREE_PURPOSE (link); | |
6321 | rtx context = lookup_static_chain (function); | |
6322 | rtx tramp = RTL_EXPR_RTL (TREE_VALUE (link)); | |
7a87758d | 6323 | #ifdef TRAMPOLINE_TEMPLATE |
1e2414db | 6324 | rtx blktramp; |
7a87758d | 6325 | #endif |
6f086dfc RS |
6326 | rtx seq; |
6327 | ||
1e2414db | 6328 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc RS |
6329 | /* First make sure this compilation has a template for |
6330 | initializing trampolines. */ | |
6331 | if (initial_trampoline == 0) | |
86f8eff3 RK |
6332 | { |
6333 | end_temporary_allocation (); | |
6334 | initial_trampoline | |
38a448ca | 6335 | = gen_rtx_MEM (BLKmode, assemble_trampoline_template ()); |
86f8eff3 RK |
6336 | resume_temporary_allocation (); |
6337 | } | |
1e2414db | 6338 | #endif |
6f086dfc RS |
6339 | |
6340 | /* Generate insns to initialize the trampoline. */ | |
6341 | start_sequence (); | |
1e2414db RK |
6342 | tramp = round_trampoline_addr (XEXP (tramp, 0)); |
6343 | #ifdef TRAMPOLINE_TEMPLATE | |
6344 | blktramp = change_address (initial_trampoline, BLKmode, tramp); | |
6345 | emit_block_move (blktramp, initial_trampoline, | |
6346 | GEN_INT (TRAMPOLINE_SIZE), | |
189cc377 | 6347 | TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT); |
1e2414db RK |
6348 | #endif |
6349 | INITIALIZE_TRAMPOLINE (tramp, XEXP (DECL_RTL (function), 0), context); | |
6f086dfc RS |
6350 | seq = get_insns (); |
6351 | end_sequence (); | |
6352 | ||
6353 | /* Put those insns at entry to the containing function (this one). */ | |
6354 | emit_insns_before (seq, tail_recursion_reentry); | |
6355 | } | |
6f086dfc | 6356 | |
11044f66 RK |
6357 | /* If we are doing stack checking and this function makes calls, |
6358 | do a stack probe at the start of the function to ensure we have enough | |
6359 | space for another stack frame. */ | |
6360 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
6361 | { | |
6362 | rtx insn, seq; | |
6363 | ||
6364 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
6365 | if (GET_CODE (insn) == CALL_INSN) | |
6366 | { | |
6367 | start_sequence (); | |
6368 | probe_stack_range (STACK_CHECK_PROTECT, | |
6369 | GEN_INT (STACK_CHECK_MAX_FRAME_SIZE)); | |
6370 | seq = get_insns (); | |
6371 | end_sequence (); | |
6372 | emit_insns_before (seq, tail_recursion_reentry); | |
6373 | break; | |
6374 | } | |
6375 | } | |
6376 | ||
db8717d9 RK |
6377 | /* Warn about unused parms if extra warnings were specified. */ |
6378 | if (warn_unused && extra_warnings) | |
6f086dfc | 6379 | { |
db8717d9 | 6380 | tree decl; |
6f086dfc RS |
6381 | |
6382 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
6383 | decl; decl = TREE_CHAIN (decl)) | |
497dc802 JM |
6384 | if (! TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL |
6385 | && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)) | |
6f086dfc RS |
6386 | warning_with_decl (decl, "unused parameter `%s'"); |
6387 | } | |
6f086dfc RS |
6388 | |
6389 | /* Delete handlers for nonlocal gotos if nothing uses them. */ | |
ba716ac9 BS |
6390 | if (nonlocal_goto_handler_slots != 0 |
6391 | && ! current_function_has_nonlocal_label) | |
6f086dfc RS |
6392 | delete_handlers (); |
6393 | ||
6394 | /* End any sequences that failed to be closed due to syntax errors. */ | |
6395 | while (in_sequence_p ()) | |
5f4f0e22 | 6396 | end_sequence (); |
6f086dfc RS |
6397 | |
6398 | /* Outside function body, can't compute type's actual size | |
6399 | until next function's body starts. */ | |
6400 | immediate_size_expand--; | |
6401 | ||
6402 | /* If doing stupid register allocation, | |
6403 | mark register parms as dying here. */ | |
6404 | ||
6405 | if (obey_regdecls) | |
6406 | { | |
6407 | rtx tem; | |
6408 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
6409 | use_variable (regno_reg_rtx[i]); | |
6410 | ||
6411 | /* Likewise for the regs of all the SAVE_EXPRs in the function. */ | |
6412 | ||
6413 | for (tem = save_expr_regs; tem; tem = XEXP (tem, 1)) | |
6414 | { | |
6415 | use_variable (XEXP (tem, 0)); | |
6416 | use_variable_after (XEXP (tem, 0), parm_birth_insn); | |
6417 | } | |
6418 | ||
6419 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
6420 | use_variable (current_function_internal_arg_pointer); | |
6421 | } | |
6422 | ||
6423 | clear_pending_stack_adjust (); | |
6424 | do_pending_stack_adjust (); | |
6425 | ||
6426 | /* Mark the end of the function body. | |
6427 | If control reaches this insn, the function can drop through | |
6428 | without returning a value. */ | |
5f4f0e22 | 6429 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_END); |
6f086dfc | 6430 | |
82e415a3 DE |
6431 | /* Must mark the last line number note in the function, so that the test |
6432 | coverage code can avoid counting the last line twice. This just tells | |
6433 | the code to ignore the immediately following line note, since there | |
6434 | already exists a copy of this note somewhere above. This line number | |
6435 | note is still needed for debugging though, so we can't delete it. */ | |
6436 | if (flag_test_coverage) | |
6437 | emit_note (NULL_PTR, NOTE_REPEATED_LINE_NUMBER); | |
6438 | ||
6f086dfc RS |
6439 | /* Output a linenumber for the end of the function. |
6440 | SDB depends on this. */ | |
6441 | emit_line_note_force (filename, line); | |
6442 | ||
6443 | /* Output the label for the actual return from the function, | |
6444 | if one is expected. This happens either because a function epilogue | |
6445 | is used instead of a return instruction, or because a return was done | |
6446 | with a goto in order to run local cleanups, or because of pcc-style | |
6447 | structure returning. */ | |
6448 | ||
6449 | if (return_label) | |
6450 | emit_label (return_label); | |
6451 | ||
1be07046 RS |
6452 | /* C++ uses this. */ |
6453 | if (end_bindings) | |
6454 | expand_end_bindings (0, 0, 0); | |
6455 | ||
e5a1e0e8 MS |
6456 | /* Now handle any leftover exception regions that may have been |
6457 | created for the parameters. */ | |
6458 | { | |
6459 | rtx last = get_last_insn (); | |
6460 | rtx label; | |
6461 | ||
6462 | expand_leftover_cleanups (); | |
6463 | ||
6464 | /* If the above emitted any code, may sure we jump around it. */ | |
6465 | if (last != get_last_insn ()) | |
6466 | { | |
6467 | label = gen_label_rtx (); | |
6468 | last = emit_jump_insn_after (gen_jump (label), last); | |
6469 | last = emit_barrier_after (last); | |
6470 | emit_label (label); | |
6471 | } | |
6472 | } | |
6473 | ||
07417085 KR |
6474 | if (current_function_instrument_entry_exit) |
6475 | { | |
6476 | rtx fun = DECL_RTL (current_function_decl); | |
6477 | if (GET_CODE (fun) == MEM) | |
6478 | fun = XEXP (fun, 0); | |
6479 | else | |
6480 | abort (); | |
6481 | emit_library_call (profile_function_exit_libfunc, 0, VOIDmode, 2, | |
6482 | fun, Pmode, | |
6483 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
6484 | 0, | |
6485 | hard_frame_pointer_rtx), | |
6486 | Pmode); | |
6487 | } | |
6488 | ||
6f086dfc RS |
6489 | /* If we had calls to alloca, and this machine needs |
6490 | an accurate stack pointer to exit the function, | |
6491 | insert some code to save and restore the stack pointer. */ | |
6492 | #ifdef EXIT_IGNORE_STACK | |
6493 | if (! EXIT_IGNORE_STACK) | |
6494 | #endif | |
6495 | if (current_function_calls_alloca) | |
6496 | { | |
59257ff7 RK |
6497 | rtx tem = 0; |
6498 | ||
6499 | emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn); | |
5f4f0e22 | 6500 | emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX); |
6f086dfc RS |
6501 | } |
6502 | ||
6503 | /* If scalar return value was computed in a pseudo-reg, | |
6504 | copy that to the hard return register. */ | |
6505 | if (DECL_RTL (DECL_RESULT (current_function_decl)) != 0 | |
6506 | && GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) == REG | |
6507 | && (REGNO (DECL_RTL (DECL_RESULT (current_function_decl))) | |
6508 | >= FIRST_PSEUDO_REGISTER)) | |
6509 | { | |
6510 | rtx real_decl_result; | |
6511 | ||
6512 | #ifdef FUNCTION_OUTGOING_VALUE | |
6513 | real_decl_result | |
6514 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
6515 | current_function_decl); | |
6516 | #else | |
6517 | real_decl_result | |
6518 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
6519 | current_function_decl); | |
6520 | #endif | |
6521 | REG_FUNCTION_VALUE_P (real_decl_result) = 1; | |
ecec4441 JW |
6522 | /* If this is a BLKmode structure being returned in registers, then use |
6523 | the mode computed in expand_return. */ | |
6524 | if (GET_MODE (real_decl_result) == BLKmode) | |
6525 | PUT_MODE (real_decl_result, | |
6526 | GET_MODE (DECL_RTL (DECL_RESULT (current_function_decl)))); | |
6f086dfc RS |
6527 | emit_move_insn (real_decl_result, |
6528 | DECL_RTL (DECL_RESULT (current_function_decl))); | |
38a448ca | 6529 | emit_insn (gen_rtx_USE (VOIDmode, real_decl_result)); |
f345de42 JL |
6530 | |
6531 | /* The delay slot scheduler assumes that current_function_return_rtx | |
6532 | holds the hard register containing the return value, not a temporary | |
6533 | pseudo. */ | |
6534 | current_function_return_rtx = real_decl_result; | |
6f086dfc RS |
6535 | } |
6536 | ||
6537 | /* If returning a structure, arrange to return the address of the value | |
6538 | in a place where debuggers expect to find it. | |
6539 | ||
6540 | If returning a structure PCC style, | |
6541 | the caller also depends on this value. | |
6542 | And current_function_returns_pcc_struct is not necessarily set. */ | |
6543 | if (current_function_returns_struct | |
6544 | || current_function_returns_pcc_struct) | |
6545 | { | |
6546 | rtx value_address = XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0); | |
6547 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); | |
6548 | #ifdef FUNCTION_OUTGOING_VALUE | |
6549 | rtx outgoing | |
6550 | = FUNCTION_OUTGOING_VALUE (build_pointer_type (type), | |
6551 | current_function_decl); | |
6552 | #else | |
6553 | rtx outgoing | |
6554 | = FUNCTION_VALUE (build_pointer_type (type), | |
6555 | current_function_decl); | |
6556 | #endif | |
6557 | ||
6558 | /* Mark this as a function return value so integrate will delete the | |
6559 | assignment and USE below when inlining this function. */ | |
6560 | REG_FUNCTION_VALUE_P (outgoing) = 1; | |
6561 | ||
6562 | emit_move_insn (outgoing, value_address); | |
6563 | use_variable (outgoing); | |
6564 | } | |
6565 | ||
71038426 RH |
6566 | /* If this is an implementation of __throw, do what's necessary to |
6567 | communicate between __builtin_eh_return and the epilogue. */ | |
6568 | expand_eh_return (); | |
6569 | ||
6f086dfc RS |
6570 | /* Output a return insn if we are using one. |
6571 | Otherwise, let the rtl chain end here, to drop through | |
6572 | into the epilogue. */ | |
6573 | ||
6574 | #ifdef HAVE_return | |
6575 | if (HAVE_return) | |
6576 | { | |
6577 | emit_jump_insn (gen_return ()); | |
6578 | emit_barrier (); | |
6579 | } | |
6580 | #endif | |
6581 | ||
6582 | /* Fix up any gotos that jumped out to the outermost | |
6583 | binding level of the function. | |
6584 | Must follow emitting RETURN_LABEL. */ | |
6585 | ||
6586 | /* If you have any cleanups to do at this point, | |
6587 | and they need to create temporary variables, | |
6588 | then you will lose. */ | |
e15679f8 | 6589 | expand_fixups (get_insns ()); |
6f086dfc | 6590 | } |
bdac5f58 TW |
6591 | \f |
6592 | /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */ | |
6593 | ||
6594 | static int *prologue; | |
6595 | static int *epilogue; | |
6596 | ||
6597 | /* Create an array that records the INSN_UIDs of INSNS (either a sequence | |
6598 | or a single insn). */ | |
6599 | ||
487a6e06 | 6600 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
bdac5f58 TW |
6601 | static int * |
6602 | record_insns (insns) | |
6603 | rtx insns; | |
6604 | { | |
6605 | int *vec; | |
6606 | ||
6607 | if (GET_CODE (insns) == SEQUENCE) | |
6608 | { | |
6609 | int len = XVECLEN (insns, 0); | |
6610 | vec = (int *) oballoc ((len + 1) * sizeof (int)); | |
6611 | vec[len] = 0; | |
6612 | while (--len >= 0) | |
6613 | vec[len] = INSN_UID (XVECEXP (insns, 0, len)); | |
6614 | } | |
6615 | else | |
6616 | { | |
6617 | vec = (int *) oballoc (2 * sizeof (int)); | |
6618 | vec[0] = INSN_UID (insns); | |
6619 | vec[1] = 0; | |
6620 | } | |
6621 | return vec; | |
6622 | } | |
6623 | ||
10914065 | 6624 | /* Determine how many INSN_UIDs in VEC are part of INSN. */ |
bdac5f58 | 6625 | |
10914065 | 6626 | static int |
bdac5f58 TW |
6627 | contains (insn, vec) |
6628 | rtx insn; | |
6629 | int *vec; | |
6630 | { | |
6631 | register int i, j; | |
6632 | ||
6633 | if (GET_CODE (insn) == INSN | |
6634 | && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
6635 | { | |
10914065 | 6636 | int count = 0; |
bdac5f58 TW |
6637 | for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--) |
6638 | for (j = 0; vec[j]; j++) | |
6639 | if (INSN_UID (XVECEXP (PATTERN (insn), 0, i)) == vec[j]) | |
10914065 TW |
6640 | count++; |
6641 | return count; | |
bdac5f58 TW |
6642 | } |
6643 | else | |
6644 | { | |
6645 | for (j = 0; vec[j]; j++) | |
6646 | if (INSN_UID (insn) == vec[j]) | |
10914065 | 6647 | return 1; |
bdac5f58 TW |
6648 | } |
6649 | return 0; | |
6650 | } | |
081f5e7e | 6651 | #endif /* HAVE_prologue || HAVE_epilogue */ |
bdac5f58 | 6652 | |
9faa82d8 | 6653 | /* Generate the prologue and epilogue RTL if the machine supports it. Thread |
bdac5f58 TW |
6654 | this into place with notes indicating where the prologue ends and where |
6655 | the epilogue begins. Update the basic block information when possible. */ | |
6656 | ||
6657 | void | |
6658 | thread_prologue_and_epilogue_insns (f) | |
54ea1de9 | 6659 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 | 6660 | { |
e881bb1b RH |
6661 | int insertted = 0; |
6662 | ||
6663 | prologue = 0; | |
bdac5f58 TW |
6664 | #ifdef HAVE_prologue |
6665 | if (HAVE_prologue) | |
6666 | { | |
e881bb1b | 6667 | rtx seq; |
bdac5f58 | 6668 | |
e881bb1b RH |
6669 | start_sequence (); |
6670 | seq = gen_prologue(); | |
6671 | emit_insn (seq); | |
bdac5f58 TW |
6672 | |
6673 | /* Retain a map of the prologue insns. */ | |
e881bb1b RH |
6674 | if (GET_CODE (seq) != SEQUENCE) |
6675 | seq = get_insns (); | |
6676 | prologue = record_insns (seq); | |
6677 | ||
6678 | emit_note (NULL, NOTE_INSN_PROLOGUE_END); | |
6679 | seq = gen_sequence (); | |
6680 | end_sequence (); | |
6681 | ||
6682 | /* If optimization is off, and perhaps in an empty function, | |
6683 | the entry block will have no successors. */ | |
6684 | if (ENTRY_BLOCK_PTR->succ) | |
6685 | { | |
6686 | /* Can't deal with multiple successsors of the entry block. */ | |
6687 | if (ENTRY_BLOCK_PTR->succ->succ_next) | |
6688 | abort (); | |
6689 | ||
6690 | insert_insn_on_edge (seq, ENTRY_BLOCK_PTR->succ); | |
6691 | insertted = 1; | |
6692 | } | |
6693 | else | |
6694 | emit_insn_after (seq, f); | |
bdac5f58 | 6695 | } |
bdac5f58 | 6696 | #endif |
bdac5f58 | 6697 | |
e881bb1b | 6698 | epilogue = 0; |
bdac5f58 TW |
6699 | #ifdef HAVE_epilogue |
6700 | if (HAVE_epilogue) | |
6701 | { | |
e881bb1b RH |
6702 | edge e; |
6703 | basic_block bb = 0; | |
6704 | rtx tail = get_last_insn (); | |
6705 | ||
6706 | /* ??? This is gastly. If function returns were not done via uses, | |
6707 | but via mark_regs_live_at_end, we could use insert_insn_on_edge | |
6708 | and all of this uglyness would go away. */ | |
bdac5f58 | 6709 | |
e881bb1b | 6710 | switch (optimize) |
bdac5f58 | 6711 | { |
e881bb1b RH |
6712 | default: |
6713 | /* If the exit block has no non-fake predecessors, we don't | |
6714 | need an epilogue. Furthermore, only pay attention to the | |
6715 | fallthru predecessors; if (conditional) return insns were | |
6716 | generated, by definition we do not need to emit epilogue | |
6717 | insns. */ | |
6718 | ||
6719 | for (e = EXIT_BLOCK_PTR->pred; e ; e = e->pred_next) | |
6720 | if ((e->flags & EDGE_FAKE) == 0 | |
6721 | && (e->flags & EDGE_FALLTHRU) != 0) | |
6722 | break; | |
6723 | if (e == NULL) | |
6724 | break; | |
6725 | ||
6726 | /* We can't handle multiple epilogues -- if one is needed, | |
6727 | we won't be able to place it multiple times. | |
6728 | ||
6729 | ??? Fix epilogue expanders to not assume they are the | |
6730 | last thing done compiling the function. Either that | |
6731 | or copy_rtx each insn. | |
6732 | ||
6733 | ??? Blah, it's not a simple expression to assert that | |
6734 | we've exactly one fallthru exit edge. */ | |
6735 | ||
6736 | bb = e->src; | |
6737 | tail = bb->end; | |
6738 | ||
6739 | /* ??? If the last insn of the basic block is a jump, then we | |
6740 | are creating a new basic block. Wimp out and leave these | |
6741 | insns outside any block. */ | |
6742 | if (GET_CODE (tail) == JUMP_INSN) | |
6743 | bb = 0; | |
6744 | ||
6745 | /* FALLTHRU */ | |
6746 | case 0: | |
6747 | { | |
6748 | rtx prev, seq, first_use; | |
6749 | ||
6750 | /* Move the USE insns at the end of a function onto a list. */ | |
6751 | prev = tail; | |
6752 | if (GET_CODE (prev) == BARRIER | |
6753 | || GET_CODE (prev) == NOTE) | |
bdac5f58 | 6754 | prev = prev_nonnote_insn (prev); |
a78bdb38 | 6755 | |
e881bb1b RH |
6756 | first_use = 0; |
6757 | if (prev | |
6758 | && GET_CODE (prev) == INSN | |
6759 | && GET_CODE (PATTERN (prev)) == USE) | |
6760 | { | |
6761 | /* If the end of the block is the use, grab hold of something | |
6762 | else so that we emit barriers etc in the right place. */ | |
6763 | if (prev == tail) | |
6764 | { | |
6765 | do | |
6766 | tail = PREV_INSN (tail); | |
6767 | while (GET_CODE (tail) == INSN | |
6768 | && GET_CODE (PATTERN (tail)) == USE); | |
6769 | } | |
bdac5f58 | 6770 | |
e881bb1b RH |
6771 | do |
6772 | { | |
6773 | rtx use = prev; | |
6774 | prev = prev_nonnote_insn (prev); | |
6775 | ||
6776 | remove_insn (use); | |
6777 | if (first_use) | |
6778 | { | |
6779 | NEXT_INSN (use) = first_use; | |
6780 | PREV_INSN (first_use) = use; | |
6781 | } | |
6782 | else | |
6783 | NEXT_INSN (use) = NULL_RTX; | |
6784 | first_use = use; | |
6785 | } | |
6786 | while (prev | |
6787 | && GET_CODE (prev) == INSN | |
6788 | && GET_CODE (PATTERN (prev)) == USE); | |
6789 | } | |
a78bdb38 | 6790 | |
e881bb1b RH |
6791 | /* The last basic block ends with a NOTE_INSN_EPILOGUE_BEG, the |
6792 | epilogue insns, the USE insns at the end of a function, | |
6793 | the jump insn that returns, and then a BARRIER. */ | |
a78bdb38 | 6794 | |
e881bb1b RH |
6795 | if (GET_CODE (tail) != BARRIER) |
6796 | { | |
6797 | prev = next_nonnote_insn (tail); | |
6798 | if (!prev || GET_CODE (prev) != BARRIER) | |
6799 | emit_barrier_after (tail); | |
6800 | } | |
a78bdb38 | 6801 | |
e881bb1b RH |
6802 | seq = gen_epilogue (); |
6803 | prev = tail; | |
6804 | tail = emit_jump_insn_after (seq, tail); | |
bdac5f58 | 6805 | |
e881bb1b RH |
6806 | /* Insert the USE insns immediately before the return insn, which |
6807 | must be the last instruction emitted in the sequence. */ | |
6808 | if (first_use) | |
6809 | emit_insns_before (first_use, tail); | |
6810 | emit_note_after (NOTE_INSN_EPILOGUE_BEG, prev); | |
bdac5f58 | 6811 | |
e881bb1b RH |
6812 | /* Update the tail of the basic block. */ |
6813 | if (bb) | |
6814 | bb->end = tail; | |
6815 | ||
6816 | /* Retain a map of the epilogue insns. */ | |
6817 | epilogue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : tail); | |
6818 | } | |
bdac5f58 TW |
6819 | } |
6820 | } | |
6821 | #endif | |
e881bb1b RH |
6822 | |
6823 | if (insertted) | |
6824 | commit_edge_insertions (); | |
bdac5f58 TW |
6825 | } |
6826 | ||
6827 | /* Reposition the prologue-end and epilogue-begin notes after instruction | |
6828 | scheduling and delayed branch scheduling. */ | |
6829 | ||
6830 | void | |
6831 | reposition_prologue_and_epilogue_notes (f) | |
79c9824e | 6832 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 TW |
6833 | { |
6834 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) | |
6835 | /* Reposition the prologue and epilogue notes. */ | |
6836 | if (n_basic_blocks) | |
6837 | { | |
bf526252 | 6838 | int len; |
bdac5f58 TW |
6839 | |
6840 | if (prologue) | |
6841 | { | |
bf526252 RK |
6842 | register rtx insn, note = 0; |
6843 | ||
6844 | /* Scan from the beginning until we reach the last prologue insn. | |
6845 | We apparently can't depend on basic_block_{head,end} after | |
6846 | reorg has run. */ | |
6847 | for (len = 0; prologue[len]; len++) | |
6848 | ; | |
9392c110 JH |
6849 | for (insn = f; len && insn; insn = NEXT_INSN (insn)) |
6850 | { | |
6851 | if (GET_CODE (insn) == NOTE) | |
6852 | { | |
6853 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END) | |
6854 | note = insn; | |
6855 | } | |
6856 | else if ((len -= contains (insn, prologue)) == 0) | |
6857 | { | |
89e99eea | 6858 | rtx next; |
9392c110 JH |
6859 | /* Find the prologue-end note if we haven't already, and |
6860 | move it to just after the last prologue insn. */ | |
6861 | if (note == 0) | |
6862 | { | |
51723711 | 6863 | for (note = insn; (note = NEXT_INSN (note));) |
9392c110 JH |
6864 | if (GET_CODE (note) == NOTE |
6865 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END) | |
6866 | break; | |
6867 | } | |
c93b03c2 | 6868 | |
9392c110 | 6869 | next = NEXT_INSN (note); |
c93b03c2 | 6870 | |
3b413743 | 6871 | /* Whether or not we can depend on BLOCK_HEAD, |
c93b03c2 | 6872 | attempt to keep it up-to-date. */ |
3b413743 RH |
6873 | if (BLOCK_HEAD (0) == note) |
6874 | BLOCK_HEAD (0) = next; | |
c93b03c2 | 6875 | |
89e99eea | 6876 | remove_insn (note); |
9392c110 JH |
6877 | add_insn_after (note, insn); |
6878 | } | |
6879 | } | |
bdac5f58 TW |
6880 | } |
6881 | ||
6882 | if (epilogue) | |
6883 | { | |
bf526252 RK |
6884 | register rtx insn, note = 0; |
6885 | ||
6886 | /* Scan from the end until we reach the first epilogue insn. | |
6887 | We apparently can't depend on basic_block_{head,end} after | |
6888 | reorg has run. */ | |
6889 | for (len = 0; epilogue[len]; len++) | |
6890 | ; | |
9392c110 JH |
6891 | for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn)) |
6892 | { | |
6893 | if (GET_CODE (insn) == NOTE) | |
6894 | { | |
6895 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG) | |
6896 | note = insn; | |
6897 | } | |
6898 | else if ((len -= contains (insn, epilogue)) == 0) | |
6899 | { | |
6900 | /* Find the epilogue-begin note if we haven't already, and | |
6901 | move it to just before the first epilogue insn. */ | |
6902 | if (note == 0) | |
6903 | { | |
51723711 | 6904 | for (note = insn; (note = PREV_INSN (note));) |
9392c110 JH |
6905 | if (GET_CODE (note) == NOTE |
6906 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG) | |
6907 | break; | |
6908 | } | |
c93b03c2 | 6909 | |
3b413743 | 6910 | /* Whether or not we can depend on BLOCK_HEAD, |
c93b03c2 RH |
6911 | attempt to keep it up-to-date. */ |
6912 | if (n_basic_blocks | |
3b413743 RH |
6913 | && BLOCK_HEAD (n_basic_blocks-1) == insn) |
6914 | BLOCK_HEAD (n_basic_blocks-1) = note; | |
c93b03c2 | 6915 | |
89e99eea | 6916 | remove_insn (note); |
c93b03c2 | 6917 | add_insn_before (note, insn); |
9392c110 JH |
6918 | } |
6919 | } | |
bdac5f58 TW |
6920 | } |
6921 | } | |
6922 | #endif /* HAVE_prologue or HAVE_epilogue */ | |
6923 | } |