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6f086dfc | 1 | /* Expands front end tree to back end RTL for GNU C-Compiler |
c85f7c16 | 2 | Copyright (C) 1987, 88, 89, 91-97, 1998 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" |
6f086dfc | 59 | |
189cc377 RK |
60 | #ifndef TRAMPOLINE_ALIGNMENT |
61 | #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY | |
62 | #endif | |
63 | ||
293e3de4 RS |
64 | /* Some systems use __main in a way incompatible with its use in gcc, in these |
65 | cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to | |
66 | give the same symbol without quotes for an alternative entry point. You | |
0f41302f | 67 | must define both, or neither. */ |
293e3de4 RS |
68 | #ifndef NAME__MAIN |
69 | #define NAME__MAIN "__main" | |
70 | #define SYMBOL__MAIN __main | |
71 | #endif | |
72 | ||
6f086dfc RS |
73 | /* Round a value to the lowest integer less than it that is a multiple of |
74 | the required alignment. Avoid using division in case the value is | |
75 | negative. Assume the alignment is a power of two. */ | |
76 | #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1)) | |
77 | ||
78 | /* Similar, but round to the next highest integer that meets the | |
79 | alignment. */ | |
80 | #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1)) | |
81 | ||
82 | /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp | |
83 | during rtl generation. If they are different register numbers, this is | |
84 | always true. It may also be true if | |
85 | FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl | |
86 | generation. See fix_lexical_addr for details. */ | |
87 | ||
88 | #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
89 | #define NEED_SEPARATE_AP | |
90 | #endif | |
91 | ||
92 | /* Number of bytes of args popped by function being compiled on its return. | |
93 | Zero if no bytes are to be popped. | |
94 | May affect compilation of return insn or of function epilogue. */ | |
95 | ||
96 | int current_function_pops_args; | |
97 | ||
98 | /* Nonzero if function being compiled needs to be given an address | |
99 | where the value should be stored. */ | |
100 | ||
101 | int current_function_returns_struct; | |
102 | ||
103 | /* Nonzero if function being compiled needs to | |
104 | return the address of where it has put a structure value. */ | |
105 | ||
106 | int current_function_returns_pcc_struct; | |
107 | ||
108 | /* Nonzero if function being compiled needs to be passed a static chain. */ | |
109 | ||
110 | int current_function_needs_context; | |
111 | ||
112 | /* Nonzero if function being compiled can call setjmp. */ | |
113 | ||
114 | int current_function_calls_setjmp; | |
115 | ||
116 | /* Nonzero if function being compiled can call longjmp. */ | |
117 | ||
118 | int current_function_calls_longjmp; | |
119 | ||
120 | /* Nonzero if function being compiled receives nonlocal gotos | |
121 | from nested functions. */ | |
122 | ||
123 | int current_function_has_nonlocal_label; | |
124 | ||
8634413a JW |
125 | /* Nonzero if function being compiled has nonlocal gotos to parent |
126 | function. */ | |
127 | ||
128 | int current_function_has_nonlocal_goto; | |
129 | ||
4d1d8045 BS |
130 | /* Nonzero if this function has a computed goto. |
131 | ||
132 | It is computed during find_basic_blocks or during stupid life | |
133 | analysis. */ | |
134 | ||
135 | int current_function_has_computed_jump; | |
136 | ||
6f086dfc RS |
137 | /* Nonzero if function being compiled contains nested functions. */ |
138 | ||
139 | int current_function_contains_functions; | |
140 | ||
173cd503 JM |
141 | /* Nonzero if the current function is a thunk (a lightweight function that |
142 | just adjusts one of its arguments and forwards to another function), so | |
143 | we should try to cut corners where we can. */ | |
144 | int current_function_is_thunk; | |
145 | ||
6f086dfc RS |
146 | /* Nonzero if function being compiled can call alloca, |
147 | either as a subroutine or builtin. */ | |
148 | ||
149 | int current_function_calls_alloca; | |
150 | ||
151 | /* Nonzero if the current function returns a pointer type */ | |
152 | ||
153 | int current_function_returns_pointer; | |
154 | ||
155 | /* If some insns can be deferred to the delay slots of the epilogue, the | |
156 | delay list for them is recorded here. */ | |
157 | ||
158 | rtx current_function_epilogue_delay_list; | |
159 | ||
160 | /* If function's args have a fixed size, this is that size, in bytes. | |
161 | Otherwise, it is -1. | |
162 | May affect compilation of return insn or of function epilogue. */ | |
163 | ||
164 | int current_function_args_size; | |
165 | ||
166 | /* # bytes the prologue should push and pretend that the caller pushed them. | |
167 | The prologue must do this, but only if parms can be passed in registers. */ | |
168 | ||
169 | int current_function_pretend_args_size; | |
170 | ||
f7339633 | 171 | /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is |
0f41302f | 172 | defined, the needed space is pushed by the prologue. */ |
6f086dfc RS |
173 | |
174 | int current_function_outgoing_args_size; | |
175 | ||
176 | /* This is the offset from the arg pointer to the place where the first | |
177 | anonymous arg can be found, if there is one. */ | |
178 | ||
179 | rtx current_function_arg_offset_rtx; | |
180 | ||
181 | /* Nonzero if current function uses varargs.h or equivalent. | |
182 | Zero for functions that use stdarg.h. */ | |
183 | ||
184 | int current_function_varargs; | |
185 | ||
ebb904cb RK |
186 | /* Nonzero if current function uses stdarg.h or equivalent. |
187 | Zero for functions that use varargs.h. */ | |
188 | ||
189 | int current_function_stdarg; | |
190 | ||
6f086dfc RS |
191 | /* Quantities of various kinds of registers |
192 | used for the current function's args. */ | |
193 | ||
194 | CUMULATIVE_ARGS current_function_args_info; | |
195 | ||
196 | /* Name of function now being compiled. */ | |
197 | ||
198 | char *current_function_name; | |
199 | ||
f345de42 JL |
200 | /* If non-zero, an RTL expression for the location at which the current |
201 | function returns its result. If the current function returns its | |
202 | result in a register, current_function_return_rtx will always be | |
203 | the hard register containing the result. */ | |
6f086dfc RS |
204 | |
205 | rtx current_function_return_rtx; | |
206 | ||
207 | /* Nonzero if the current function uses the constant pool. */ | |
208 | ||
209 | int current_function_uses_const_pool; | |
210 | ||
211 | /* Nonzero if the current function uses pic_offset_table_rtx. */ | |
212 | int current_function_uses_pic_offset_table; | |
213 | ||
214 | /* The arg pointer hard register, or the pseudo into which it was copied. */ | |
215 | rtx current_function_internal_arg_pointer; | |
216 | ||
aeb302bb JM |
217 | /* Language-specific reason why the current function cannot be made inline. */ |
218 | char *current_function_cannot_inline; | |
219 | ||
07417085 KR |
220 | /* Nonzero if instrumentation calls for function entry and exit should be |
221 | generated. */ | |
222 | int current_function_instrument_entry_exit; | |
223 | ||
6f086dfc RS |
224 | /* The FUNCTION_DECL for an inline function currently being expanded. */ |
225 | tree inline_function_decl; | |
226 | ||
227 | /* Number of function calls seen so far in current function. */ | |
228 | ||
229 | int function_call_count; | |
230 | ||
231 | /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels | |
232 | (labels to which there can be nonlocal gotos from nested functions) | |
233 | in this function. */ | |
234 | ||
235 | tree nonlocal_labels; | |
236 | ||
237 | /* RTX for stack slot that holds the current handler for nonlocal gotos. | |
238 | Zero when function does not have nonlocal labels. */ | |
239 | ||
240 | rtx nonlocal_goto_handler_slot; | |
241 | ||
242 | /* RTX for stack slot that holds the stack pointer value to restore | |
243 | for a nonlocal goto. | |
244 | Zero when function does not have nonlocal labels. */ | |
245 | ||
246 | rtx nonlocal_goto_stack_level; | |
247 | ||
248 | /* Label that will go on parm cleanup code, if any. | |
249 | Jumping to this label runs cleanup code for parameters, if | |
250 | such code must be run. Following this code is the logical return label. */ | |
251 | ||
252 | rtx cleanup_label; | |
253 | ||
254 | /* Label that will go on function epilogue. | |
255 | Jumping to this label serves as a "return" instruction | |
256 | on machines which require execution of the epilogue on all returns. */ | |
257 | ||
258 | rtx return_label; | |
259 | ||
260 | /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs. | |
261 | So we can mark them all live at the end of the function, if nonopt. */ | |
262 | rtx save_expr_regs; | |
263 | ||
264 | /* List (chain of EXPR_LISTs) of all stack slots in this function. | |
265 | Made for the sake of unshare_all_rtl. */ | |
266 | rtx stack_slot_list; | |
267 | ||
268 | /* Chain of all RTL_EXPRs that have insns in them. */ | |
269 | tree rtl_expr_chain; | |
270 | ||
271 | /* Label to jump back to for tail recursion, or 0 if we have | |
272 | not yet needed one for this function. */ | |
273 | rtx tail_recursion_label; | |
274 | ||
275 | /* Place after which to insert the tail_recursion_label if we need one. */ | |
276 | rtx tail_recursion_reentry; | |
277 | ||
278 | /* Location at which to save the argument pointer if it will need to be | |
279 | referenced. There are two cases where this is done: if nonlocal gotos | |
280 | exist, or if vars stored at an offset from the argument pointer will be | |
281 | needed by inner routines. */ | |
282 | ||
283 | rtx arg_pointer_save_area; | |
284 | ||
285 | /* Offset to end of allocated area of stack frame. | |
286 | If stack grows down, this is the address of the last stack slot allocated. | |
287 | If stack grows up, this is the address for the next slot. */ | |
8af5168b | 288 | HOST_WIDE_INT frame_offset; |
6f086dfc RS |
289 | |
290 | /* List (chain of TREE_LISTs) of static chains for containing functions. | |
291 | Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx | |
292 | in an RTL_EXPR in the TREE_VALUE. */ | |
293 | static tree context_display; | |
294 | ||
295 | /* List (chain of TREE_LISTs) of trampolines for nested functions. | |
296 | The trampoline sets up the static chain and jumps to the function. | |
297 | We supply the trampoline's address when the function's address is requested. | |
298 | ||
299 | Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx | |
300 | in an RTL_EXPR in the TREE_VALUE. */ | |
301 | static tree trampoline_list; | |
302 | ||
303 | /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */ | |
304 | static rtx parm_birth_insn; | |
305 | ||
306 | #if 0 | |
307 | /* Nonzero if a stack slot has been generated whose address is not | |
308 | actually valid. It means that the generated rtl must all be scanned | |
309 | to detect and correct the invalid addresses where they occur. */ | |
310 | static int invalid_stack_slot; | |
311 | #endif | |
312 | ||
313 | /* Last insn of those whose job was to put parms into their nominal homes. */ | |
314 | static rtx last_parm_insn; | |
315 | ||
e9a25f70 JL |
316 | /* 1 + last pseudo register number possibly used for loading a copy |
317 | of a parameter of this function. */ | |
318 | int max_parm_reg; | |
6f086dfc RS |
319 | |
320 | /* Vector indexed by REGNO, containing location on stack in which | |
321 | to put the parm which is nominally in pseudo register REGNO, | |
e9a25f70 JL |
322 | if we discover that that parm must go in the stack. The highest |
323 | element in this vector is one less than MAX_PARM_REG, above. */ | |
324 | rtx *parm_reg_stack_loc; | |
6f086dfc | 325 | |
6f086dfc RS |
326 | /* Nonzero once virtual register instantiation has been done. |
327 | assign_stack_local uses frame_pointer_rtx when this is nonzero. */ | |
328 | static int virtuals_instantiated; | |
329 | ||
46766466 RS |
330 | /* These variables hold pointers to functions to |
331 | save and restore machine-specific data, | |
332 | in push_function_context and pop_function_context. */ | |
9e014ded RK |
333 | void (*save_machine_status) PROTO((struct function *)); |
334 | void (*restore_machine_status) PROTO((struct function *)); | |
46766466 | 335 | |
6f086dfc RS |
336 | /* Nonzero if we need to distinguish between the return value of this function |
337 | and the return value of a function called by this function. This helps | |
338 | integrate.c */ | |
339 | ||
340 | extern int rtx_equal_function_value_matters; | |
e7a84011 | 341 | extern tree sequence_rtl_expr; |
6f086dfc RS |
342 | \f |
343 | /* In order to evaluate some expressions, such as function calls returning | |
344 | structures in memory, we need to temporarily allocate stack locations. | |
345 | We record each allocated temporary in the following structure. | |
346 | ||
347 | Associated with each temporary slot is a nesting level. When we pop up | |
348 | one level, all temporaries associated with the previous level are freed. | |
349 | Normally, all temporaries are freed after the execution of the statement | |
350 | in which they were created. However, if we are inside a ({...}) grouping, | |
351 | the result may be in a temporary and hence must be preserved. If the | |
352 | result could be in a temporary, we preserve it if we can determine which | |
353 | one it is in. If we cannot determine which temporary may contain the | |
354 | result, all temporaries are preserved. A temporary is preserved by | |
355 | pretending it was allocated at the previous nesting level. | |
356 | ||
357 | Automatic variables are also assigned temporary slots, at the nesting | |
358 | level where they are defined. They are marked a "kept" so that | |
359 | free_temp_slots will not free them. */ | |
360 | ||
361 | struct temp_slot | |
362 | { | |
363 | /* Points to next temporary slot. */ | |
364 | struct temp_slot *next; | |
0f41302f | 365 | /* The rtx to used to reference the slot. */ |
6f086dfc | 366 | rtx slot; |
e5e76139 RK |
367 | /* The rtx used to represent the address if not the address of the |
368 | slot above. May be an EXPR_LIST if multiple addresses exist. */ | |
369 | rtx address; | |
6f086dfc | 370 | /* The size, in units, of the slot. */ |
e5e809f4 | 371 | HOST_WIDE_INT size; |
e7a84011 RK |
372 | /* The value of `sequence_rtl_expr' when this temporary is allocated. */ |
373 | tree rtl_expr; | |
6f086dfc RS |
374 | /* Non-zero if this temporary is currently in use. */ |
375 | char in_use; | |
a25d4ba2 RK |
376 | /* Non-zero if this temporary has its address taken. */ |
377 | char addr_taken; | |
6f086dfc RS |
378 | /* Nesting level at which this slot is being used. */ |
379 | int level; | |
380 | /* Non-zero if this should survive a call to free_temp_slots. */ | |
381 | int keep; | |
fc91b0d0 RK |
382 | /* The offset of the slot from the frame_pointer, including extra space |
383 | for alignment. This info is for combine_temp_slots. */ | |
e5e809f4 | 384 | HOST_WIDE_INT base_offset; |
fc91b0d0 RK |
385 | /* The size of the slot, including extra space for alignment. This |
386 | info is for combine_temp_slots. */ | |
e5e809f4 | 387 | HOST_WIDE_INT full_size; |
6f086dfc RS |
388 | }; |
389 | ||
390 | /* List of all temporaries allocated, both available and in use. */ | |
391 | ||
392 | struct temp_slot *temp_slots; | |
393 | ||
394 | /* Current nesting level for temporaries. */ | |
395 | ||
396 | int temp_slot_level; | |
e5e809f4 JL |
397 | |
398 | /* Current nesting level for variables in a block. */ | |
399 | ||
400 | int var_temp_slot_level; | |
f5963e61 JL |
401 | |
402 | /* When temporaries are created by TARGET_EXPRs, they are created at | |
403 | this level of temp_slot_level, so that they can remain allocated | |
404 | until no longer needed. CLEANUP_POINT_EXPRs define the lifetime | |
405 | of TARGET_EXPRs. */ | |
406 | int target_temp_slot_level; | |
6f086dfc | 407 | \f |
e15679f8 RK |
408 | /* This structure is used to record MEMs or pseudos used to replace VAR, any |
409 | SUBREGs of VAR, and any MEMs containing VAR as an address. We need to | |
410 | maintain this list in case two operands of an insn were required to match; | |
411 | in that case we must ensure we use the same replacement. */ | |
412 | ||
413 | struct fixup_replacement | |
414 | { | |
415 | rtx old; | |
416 | rtx new; | |
417 | struct fixup_replacement *next; | |
418 | }; | |
419 | ||
420 | /* Forward declarations. */ | |
421 | ||
1ac4f799 JL |
422 | static rtx assign_outer_stack_local PROTO ((enum machine_mode, HOST_WIDE_INT, |
423 | int, struct function *)); | |
e15679f8 RK |
424 | static struct temp_slot *find_temp_slot_from_address PROTO((rtx)); |
425 | static void put_reg_into_stack PROTO((struct function *, rtx, tree, | |
0006e95b | 426 | enum machine_mode, enum machine_mode, |
e5e809f4 | 427 | int, int, int)); |
e15679f8 RK |
428 | static void fixup_var_refs PROTO((rtx, enum machine_mode, int)); |
429 | static struct fixup_replacement | |
430 | *find_fixup_replacement PROTO((struct fixup_replacement **, rtx)); | |
431 | static void fixup_var_refs_insns PROTO((rtx, enum machine_mode, int, | |
432 | rtx, int)); | |
433 | static void fixup_var_refs_1 PROTO((rtx, enum machine_mode, rtx *, rtx, | |
434 | struct fixup_replacement **)); | |
435 | static rtx fixup_memory_subreg PROTO((rtx, rtx, int)); | |
436 | static rtx walk_fixup_memory_subreg PROTO((rtx, rtx, int)); | |
437 | static rtx fixup_stack_1 PROTO((rtx, rtx)); | |
438 | static void optimize_bit_field PROTO((rtx, rtx, rtx *)); | |
439 | static void instantiate_decls PROTO((tree, int)); | |
440 | static void instantiate_decls_1 PROTO((tree, int)); | |
441 | static void instantiate_decl PROTO((rtx, int, int)); | |
442 | static int instantiate_virtual_regs_1 PROTO((rtx *, rtx, int)); | |
443 | static void delete_handlers PROTO((void)); | |
444 | static void pad_to_arg_alignment PROTO((struct args_size *, int)); | |
51723711 | 445 | #ifndef ARGS_GROW_DOWNWARD |
e15679f8 RK |
446 | static void pad_below PROTO((struct args_size *, enum machine_mode, |
447 | tree)); | |
51723711 | 448 | #endif |
487a6e06 | 449 | #ifdef ARGS_GROW_DOWNWARD |
e15679f8 | 450 | static tree round_down PROTO((tree, int)); |
487a6e06 | 451 | #endif |
e15679f8 RK |
452 | static rtx round_trampoline_addr PROTO((rtx)); |
453 | static tree blocks_nreverse PROTO((tree)); | |
454 | static int all_blocks PROTO((tree, tree *)); | |
081f5e7e | 455 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
487a6e06 | 456 | static int *record_insns PROTO((rtx)); |
e15679f8 | 457 | static int contains PROTO((rtx, int *)); |
081f5e7e | 458 | #endif /* HAVE_prologue || HAVE_epilogue */ |
e9a25f70 JL |
459 | static void put_addressof_into_stack PROTO((rtx)); |
460 | static void purge_addressof_1 PROTO((rtx *, rtx, int)); | |
c20bf1f3 | 461 | \f |
6f086dfc RS |
462 | /* Pointer to chain of `struct function' for containing functions. */ |
463 | struct function *outer_function_chain; | |
464 | ||
465 | /* Given a function decl for a containing function, | |
466 | return the `struct function' for it. */ | |
467 | ||
468 | struct function * | |
469 | find_function_data (decl) | |
470 | tree decl; | |
471 | { | |
472 | struct function *p; | |
e5e809f4 | 473 | |
6f086dfc RS |
474 | for (p = outer_function_chain; p; p = p->next) |
475 | if (p->decl == decl) | |
476 | return p; | |
e5e809f4 | 477 | |
6f086dfc RS |
478 | abort (); |
479 | } | |
480 | ||
481 | /* Save the current context for compilation of a nested function. | |
482 | This is called from language-specific code. | |
483 | The caller is responsible for saving any language-specific status, | |
6dc42e49 | 484 | since this function knows only about language-independent variables. */ |
6f086dfc RS |
485 | |
486 | void | |
a0dabda5 JM |
487 | push_function_context_to (context) |
488 | tree context; | |
6f086dfc RS |
489 | { |
490 | struct function *p = (struct function *) xmalloc (sizeof (struct function)); | |
491 | ||
492 | p->next = outer_function_chain; | |
493 | outer_function_chain = p; | |
494 | ||
495 | p->name = current_function_name; | |
496 | p->decl = current_function_decl; | |
497 | p->pops_args = current_function_pops_args; | |
498 | p->returns_struct = current_function_returns_struct; | |
499 | p->returns_pcc_struct = current_function_returns_pcc_struct; | |
1651bdfe | 500 | p->returns_pointer = current_function_returns_pointer; |
6f086dfc RS |
501 | p->needs_context = current_function_needs_context; |
502 | p->calls_setjmp = current_function_calls_setjmp; | |
503 | p->calls_longjmp = current_function_calls_longjmp; | |
504 | p->calls_alloca = current_function_calls_alloca; | |
505 | p->has_nonlocal_label = current_function_has_nonlocal_label; | |
8634413a | 506 | p->has_nonlocal_goto = current_function_has_nonlocal_goto; |
a0dabda5 | 507 | p->contains_functions = current_function_contains_functions; |
173cd503 | 508 | p->is_thunk = current_function_is_thunk; |
6f086dfc RS |
509 | p->args_size = current_function_args_size; |
510 | p->pretend_args_size = current_function_pretend_args_size; | |
511 | p->arg_offset_rtx = current_function_arg_offset_rtx; | |
3b69d50e | 512 | p->varargs = current_function_varargs; |
ebb904cb | 513 | p->stdarg = current_function_stdarg; |
6f086dfc RS |
514 | p->uses_const_pool = current_function_uses_const_pool; |
515 | p->uses_pic_offset_table = current_function_uses_pic_offset_table; | |
516 | p->internal_arg_pointer = current_function_internal_arg_pointer; | |
aeb302bb | 517 | p->cannot_inline = current_function_cannot_inline; |
6f086dfc RS |
518 | p->max_parm_reg = max_parm_reg; |
519 | p->parm_reg_stack_loc = parm_reg_stack_loc; | |
520 | p->outgoing_args_size = current_function_outgoing_args_size; | |
521 | p->return_rtx = current_function_return_rtx; | |
522 | p->nonlocal_goto_handler_slot = nonlocal_goto_handler_slot; | |
523 | p->nonlocal_goto_stack_level = nonlocal_goto_stack_level; | |
524 | p->nonlocal_labels = nonlocal_labels; | |
525 | p->cleanup_label = cleanup_label; | |
526 | p->return_label = return_label; | |
527 | p->save_expr_regs = save_expr_regs; | |
528 | p->stack_slot_list = stack_slot_list; | |
529 | p->parm_birth_insn = parm_birth_insn; | |
530 | p->frame_offset = frame_offset; | |
531 | p->tail_recursion_label = tail_recursion_label; | |
532 | p->tail_recursion_reentry = tail_recursion_reentry; | |
533 | p->arg_pointer_save_area = arg_pointer_save_area; | |
534 | p->rtl_expr_chain = rtl_expr_chain; | |
535 | p->last_parm_insn = last_parm_insn; | |
536 | p->context_display = context_display; | |
537 | p->trampoline_list = trampoline_list; | |
538 | p->function_call_count = function_call_count; | |
539 | p->temp_slots = temp_slots; | |
540 | p->temp_slot_level = temp_slot_level; | |
e5e809f4 JL |
541 | p->target_temp_slot_level = target_temp_slot_level; |
542 | p->var_temp_slot_level = var_temp_slot_level; | |
6f086dfc | 543 | p->fixup_var_refs_queue = 0; |
f979c996 | 544 | p->epilogue_delay_list = current_function_epilogue_delay_list; |
01c1558a | 545 | p->args_info = current_function_args_info; |
07417085 | 546 | p->instrument_entry_exit = current_function_instrument_entry_exit; |
6f086dfc | 547 | |
a0dabda5 | 548 | save_tree_status (p, context); |
6f086dfc RS |
549 | save_storage_status (p); |
550 | save_emit_status (p); | |
6f086dfc RS |
551 | save_expr_status (p); |
552 | save_stmt_status (p); | |
e9a25f70 | 553 | save_varasm_status (p, context); |
46766466 RS |
554 | if (save_machine_status) |
555 | (*save_machine_status) (p); | |
6f086dfc RS |
556 | } |
557 | ||
e4a4639e JM |
558 | void |
559 | push_function_context () | |
560 | { | |
a0dabda5 | 561 | push_function_context_to (current_function_decl); |
e4a4639e JM |
562 | } |
563 | ||
6f086dfc RS |
564 | /* Restore the last saved context, at the end of a nested function. |
565 | This function is called from language-specific code. */ | |
566 | ||
567 | void | |
a0dabda5 JM |
568 | pop_function_context_from (context) |
569 | tree context; | |
6f086dfc RS |
570 | { |
571 | struct function *p = outer_function_chain; | |
e5e809f4 | 572 | struct var_refs_queue *queue; |
6f086dfc RS |
573 | |
574 | outer_function_chain = p->next; | |
575 | ||
49468af2 RK |
576 | current_function_contains_functions |
577 | = p->contains_functions || p->inline_obstacks | |
578 | || context == current_function_decl; | |
6f086dfc RS |
579 | current_function_name = p->name; |
580 | current_function_decl = p->decl; | |
581 | current_function_pops_args = p->pops_args; | |
582 | current_function_returns_struct = p->returns_struct; | |
583 | current_function_returns_pcc_struct = p->returns_pcc_struct; | |
1651bdfe | 584 | current_function_returns_pointer = p->returns_pointer; |
6f086dfc RS |
585 | current_function_needs_context = p->needs_context; |
586 | current_function_calls_setjmp = p->calls_setjmp; | |
587 | current_function_calls_longjmp = p->calls_longjmp; | |
588 | current_function_calls_alloca = p->calls_alloca; | |
589 | current_function_has_nonlocal_label = p->has_nonlocal_label; | |
8634413a | 590 | current_function_has_nonlocal_goto = p->has_nonlocal_goto; |
173cd503 | 591 | current_function_is_thunk = p->is_thunk; |
6f086dfc RS |
592 | current_function_args_size = p->args_size; |
593 | current_function_pretend_args_size = p->pretend_args_size; | |
594 | current_function_arg_offset_rtx = p->arg_offset_rtx; | |
3b69d50e | 595 | current_function_varargs = p->varargs; |
ebb904cb | 596 | current_function_stdarg = p->stdarg; |
6f086dfc RS |
597 | current_function_uses_const_pool = p->uses_const_pool; |
598 | current_function_uses_pic_offset_table = p->uses_pic_offset_table; | |
599 | current_function_internal_arg_pointer = p->internal_arg_pointer; | |
aeb302bb | 600 | current_function_cannot_inline = p->cannot_inline; |
6f086dfc RS |
601 | max_parm_reg = p->max_parm_reg; |
602 | parm_reg_stack_loc = p->parm_reg_stack_loc; | |
603 | current_function_outgoing_args_size = p->outgoing_args_size; | |
604 | current_function_return_rtx = p->return_rtx; | |
605 | nonlocal_goto_handler_slot = p->nonlocal_goto_handler_slot; | |
606 | nonlocal_goto_stack_level = p->nonlocal_goto_stack_level; | |
607 | nonlocal_labels = p->nonlocal_labels; | |
608 | cleanup_label = p->cleanup_label; | |
609 | return_label = p->return_label; | |
610 | save_expr_regs = p->save_expr_regs; | |
611 | stack_slot_list = p->stack_slot_list; | |
612 | parm_birth_insn = p->parm_birth_insn; | |
613 | frame_offset = p->frame_offset; | |
614 | tail_recursion_label = p->tail_recursion_label; | |
615 | tail_recursion_reentry = p->tail_recursion_reentry; | |
616 | arg_pointer_save_area = p->arg_pointer_save_area; | |
617 | rtl_expr_chain = p->rtl_expr_chain; | |
618 | last_parm_insn = p->last_parm_insn; | |
619 | context_display = p->context_display; | |
620 | trampoline_list = p->trampoline_list; | |
621 | function_call_count = p->function_call_count; | |
622 | temp_slots = p->temp_slots; | |
623 | temp_slot_level = p->temp_slot_level; | |
e5e809f4 JL |
624 | target_temp_slot_level = p->target_temp_slot_level; |
625 | var_temp_slot_level = p->var_temp_slot_level; | |
f979c996 | 626 | current_function_epilogue_delay_list = p->epilogue_delay_list; |
7cbc7b0c | 627 | reg_renumber = 0; |
01c1558a | 628 | current_function_args_info = p->args_info; |
07417085 | 629 | current_function_instrument_entry_exit = p->instrument_entry_exit; |
6f086dfc | 630 | |
d1485032 | 631 | restore_tree_status (p, context); |
6f086dfc RS |
632 | restore_storage_status (p); |
633 | restore_expr_status (p); | |
634 | restore_emit_status (p); | |
635 | restore_stmt_status (p); | |
a506307a | 636 | restore_varasm_status (p); |
6f086dfc | 637 | |
46766466 RS |
638 | if (restore_machine_status) |
639 | (*restore_machine_status) (p); | |
640 | ||
6f086dfc RS |
641 | /* Finish doing put_var_into_stack for any of our variables |
642 | which became addressable during the nested function. */ | |
e5e809f4 JL |
643 | for (queue = p->fixup_var_refs_queue; queue; queue = queue->next) |
644 | fixup_var_refs (queue->modified, queue->promoted_mode, queue->unsignedp); | |
6f086dfc RS |
645 | |
646 | free (p); | |
647 | ||
648 | /* Reset variables that have known state during rtx generation. */ | |
649 | rtx_equal_function_value_matters = 1; | |
650 | virtuals_instantiated = 0; | |
651 | } | |
e4a4639e JM |
652 | |
653 | void pop_function_context () | |
654 | { | |
a0dabda5 | 655 | pop_function_context_from (current_function_decl); |
e4a4639e | 656 | } |
6f086dfc RS |
657 | \f |
658 | /* Allocate fixed slots in the stack frame of the current function. */ | |
659 | ||
660 | /* Return size needed for stack frame based on slots so far allocated. | |
661 | This size counts from zero. It is not rounded to STACK_BOUNDARY; | |
662 | the caller may have to do that. */ | |
663 | ||
8af5168b | 664 | HOST_WIDE_INT |
6f086dfc RS |
665 | get_frame_size () |
666 | { | |
667 | #ifdef FRAME_GROWS_DOWNWARD | |
668 | return -frame_offset; | |
669 | #else | |
670 | return frame_offset; | |
671 | #endif | |
672 | } | |
673 | ||
674 | /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it | |
675 | with machine mode MODE. | |
676 | ||
677 | ALIGN controls the amount of alignment for the address of the slot: | |
678 | 0 means according to MODE, | |
679 | -1 means use BIGGEST_ALIGNMENT and round size to multiple of that, | |
680 | positive specifies alignment boundary in bits. | |
681 | ||
682 | We do not round to stack_boundary here. */ | |
683 | ||
684 | rtx | |
685 | assign_stack_local (mode, size, align) | |
686 | enum machine_mode mode; | |
e5e809f4 | 687 | HOST_WIDE_INT size; |
6f086dfc RS |
688 | int align; |
689 | { | |
690 | register rtx x, addr; | |
691 | int bigend_correction = 0; | |
692 | int alignment; | |
693 | ||
694 | if (align == 0) | |
695 | { | |
696 | alignment = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
697 | if (mode == BLKmode) | |
698 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
699 | } | |
700 | else if (align == -1) | |
701 | { | |
702 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
703 | size = CEIL_ROUND (size, alignment); | |
704 | } | |
705 | else | |
706 | alignment = align / BITS_PER_UNIT; | |
707 | ||
6f086dfc RS |
708 | /* Round frame offset to that alignment. |
709 | We must be careful here, since FRAME_OFFSET might be negative and | |
710 | division with a negative dividend isn't as well defined as we might | |
711 | like. So we instead assume that ALIGNMENT is a power of two and | |
712 | use logical operations which are unambiguous. */ | |
713 | #ifdef FRAME_GROWS_DOWNWARD | |
714 | frame_offset = FLOOR_ROUND (frame_offset, alignment); | |
715 | #else | |
716 | frame_offset = CEIL_ROUND (frame_offset, alignment); | |
717 | #endif | |
718 | ||
719 | /* On a big-endian machine, if we are allocating more space than we will use, | |
720 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 721 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 722 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc RS |
723 | |
724 | #ifdef FRAME_GROWS_DOWNWARD | |
725 | frame_offset -= size; | |
726 | #endif | |
727 | ||
728 | /* If we have already instantiated virtual registers, return the actual | |
729 | address relative to the frame pointer. */ | |
730 | if (virtuals_instantiated) | |
731 | addr = plus_constant (frame_pointer_rtx, | |
732 | (frame_offset + bigend_correction | |
733 | + STARTING_FRAME_OFFSET)); | |
734 | else | |
735 | addr = plus_constant (virtual_stack_vars_rtx, | |
736 | frame_offset + bigend_correction); | |
737 | ||
738 | #ifndef FRAME_GROWS_DOWNWARD | |
739 | frame_offset += size; | |
740 | #endif | |
741 | ||
38a448ca | 742 | x = gen_rtx_MEM (mode, addr); |
6f086dfc | 743 | |
38a448ca | 744 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, x, stack_slot_list); |
6f086dfc RS |
745 | |
746 | return x; | |
747 | } | |
748 | ||
749 | /* Assign a stack slot in a containing function. | |
750 | First three arguments are same as in preceding function. | |
751 | The last argument specifies the function to allocate in. */ | |
752 | ||
1ac4f799 | 753 | static rtx |
6f086dfc RS |
754 | assign_outer_stack_local (mode, size, align, function) |
755 | enum machine_mode mode; | |
e5e809f4 | 756 | HOST_WIDE_INT size; |
6f086dfc RS |
757 | int align; |
758 | struct function *function; | |
759 | { | |
760 | register rtx x, addr; | |
761 | int bigend_correction = 0; | |
762 | int alignment; | |
763 | ||
764 | /* Allocate in the memory associated with the function in whose frame | |
765 | we are assigning. */ | |
766 | push_obstacks (function->function_obstack, | |
767 | function->function_maybepermanent_obstack); | |
768 | ||
769 | if (align == 0) | |
770 | { | |
771 | alignment = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
772 | if (mode == BLKmode) | |
773 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
774 | } | |
775 | else if (align == -1) | |
776 | { | |
777 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
778 | size = CEIL_ROUND (size, alignment); | |
779 | } | |
780 | else | |
781 | alignment = align / BITS_PER_UNIT; | |
782 | ||
6f086dfc RS |
783 | /* Round frame offset to that alignment. */ |
784 | #ifdef FRAME_GROWS_DOWNWARD | |
2af69b62 | 785 | function->frame_offset = FLOOR_ROUND (function->frame_offset, alignment); |
6f086dfc | 786 | #else |
2af69b62 | 787 | function->frame_offset = CEIL_ROUND (function->frame_offset, alignment); |
6f086dfc RS |
788 | #endif |
789 | ||
790 | /* On a big-endian machine, if we are allocating more space than we will use, | |
791 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 792 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 793 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc RS |
794 | |
795 | #ifdef FRAME_GROWS_DOWNWARD | |
796 | function->frame_offset -= size; | |
797 | #endif | |
798 | addr = plus_constant (virtual_stack_vars_rtx, | |
799 | function->frame_offset + bigend_correction); | |
800 | #ifndef FRAME_GROWS_DOWNWARD | |
801 | function->frame_offset += size; | |
802 | #endif | |
803 | ||
38a448ca | 804 | x = gen_rtx_MEM (mode, addr); |
6f086dfc RS |
805 | |
806 | function->stack_slot_list | |
38a448ca | 807 | = gen_rtx_EXPR_LIST (VOIDmode, x, function->stack_slot_list); |
6f086dfc RS |
808 | |
809 | pop_obstacks (); | |
810 | ||
811 | return x; | |
812 | } | |
813 | \f | |
814 | /* Allocate a temporary stack slot and record it for possible later | |
815 | reuse. | |
816 | ||
817 | MODE is the machine mode to be given to the returned rtx. | |
818 | ||
819 | SIZE is the size in units of the space required. We do no rounding here | |
820 | since assign_stack_local will do any required rounding. | |
821 | ||
d93d4205 MS |
822 | KEEP is 1 if this slot is to be retained after a call to |
823 | free_temp_slots. Automatic variables for a block are allocated | |
e5e809f4 JL |
824 | with this flag. KEEP is 2 if we allocate a longer term temporary, |
825 | whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3 | |
826 | if we are to allocate something at an inner level to be treated as | |
827 | a variable in the block (e.g., a SAVE_EXPR). */ | |
6f086dfc RS |
828 | |
829 | rtx | |
830 | assign_stack_temp (mode, size, keep) | |
831 | enum machine_mode mode; | |
e5e809f4 | 832 | HOST_WIDE_INT size; |
6f086dfc RS |
833 | int keep; |
834 | { | |
835 | struct temp_slot *p, *best_p = 0; | |
836 | ||
303ec2aa RK |
837 | /* If SIZE is -1 it means that somebody tried to allocate a temporary |
838 | of a variable size. */ | |
839 | if (size == -1) | |
840 | abort (); | |
841 | ||
6f086dfc RS |
842 | /* First try to find an available, already-allocated temporary that is the |
843 | exact size we require. */ | |
844 | for (p = temp_slots; p; p = p->next) | |
845 | if (p->size == size && GET_MODE (p->slot) == mode && ! p->in_use) | |
846 | break; | |
847 | ||
848 | /* If we didn't find, one, try one that is larger than what we want. We | |
849 | find the smallest such. */ | |
850 | if (p == 0) | |
851 | for (p = temp_slots; p; p = p->next) | |
852 | if (p->size > size && GET_MODE (p->slot) == mode && ! p->in_use | |
853 | && (best_p == 0 || best_p->size > p->size)) | |
854 | best_p = p; | |
855 | ||
856 | /* Make our best, if any, the one to use. */ | |
857 | if (best_p) | |
a45035b6 JW |
858 | { |
859 | /* If there are enough aligned bytes left over, make them into a new | |
860 | temp_slot so that the extra bytes don't get wasted. Do this only | |
861 | for BLKmode slots, so that we can be sure of the alignment. */ | |
862 | if (GET_MODE (best_p->slot) == BLKmode) | |
863 | { | |
864 | int alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
e5e809f4 | 865 | HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment); |
a45035b6 JW |
866 | |
867 | if (best_p->size - rounded_size >= alignment) | |
868 | { | |
869 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); | |
a25d4ba2 | 870 | p->in_use = p->addr_taken = 0; |
a45035b6 | 871 | p->size = best_p->size - rounded_size; |
307d8cd6 RK |
872 | p->base_offset = best_p->base_offset + rounded_size; |
873 | p->full_size = best_p->full_size - rounded_size; | |
38a448ca RH |
874 | p->slot = gen_rtx_MEM (BLKmode, |
875 | plus_constant (XEXP (best_p->slot, 0), | |
876 | rounded_size)); | |
e5e76139 | 877 | p->address = 0; |
84e24c03 | 878 | p->rtl_expr = 0; |
a45035b6 JW |
879 | p->next = temp_slots; |
880 | temp_slots = p; | |
881 | ||
38a448ca RH |
882 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot, |
883 | stack_slot_list); | |
a45035b6 JW |
884 | |
885 | best_p->size = rounded_size; | |
291dde90 | 886 | best_p->full_size = rounded_size; |
a45035b6 JW |
887 | } |
888 | } | |
889 | ||
890 | p = best_p; | |
891 | } | |
892 | ||
6f086dfc RS |
893 | /* If we still didn't find one, make a new temporary. */ |
894 | if (p == 0) | |
895 | { | |
e5e809f4 JL |
896 | HOST_WIDE_INT frame_offset_old = frame_offset; |
897 | ||
6f086dfc | 898 | p = (struct temp_slot *) oballoc (sizeof (struct temp_slot)); |
e5e809f4 | 899 | |
6f086dfc RS |
900 | /* If the temp slot mode doesn't indicate the alignment, |
901 | use the largest possible, so no one will be disappointed. */ | |
e5e76139 | 902 | p->slot = assign_stack_local (mode, size, mode == BLKmode ? -1 : 0); |
e5e809f4 | 903 | |
b2a80c0d DE |
904 | /* The following slot size computation is necessary because we don't |
905 | know the actual size of the temporary slot until assign_stack_local | |
906 | has performed all the frame alignment and size rounding for the | |
fc91b0d0 RK |
907 | requested temporary. Note that extra space added for alignment |
908 | can be either above or below this stack slot depending on which | |
909 | way the frame grows. We include the extra space if and only if it | |
910 | is above this slot. */ | |
b2a80c0d DE |
911 | #ifdef FRAME_GROWS_DOWNWARD |
912 | p->size = frame_offset_old - frame_offset; | |
913 | #else | |
fc91b0d0 RK |
914 | p->size = size; |
915 | #endif | |
e5e809f4 | 916 | |
fc91b0d0 RK |
917 | /* Now define the fields used by combine_temp_slots. */ |
918 | #ifdef FRAME_GROWS_DOWNWARD | |
919 | p->base_offset = frame_offset; | |
920 | p->full_size = frame_offset_old - frame_offset; | |
921 | #else | |
922 | p->base_offset = frame_offset_old; | |
923 | p->full_size = frame_offset - frame_offset_old; | |
b2a80c0d | 924 | #endif |
e5e76139 | 925 | p->address = 0; |
6f086dfc RS |
926 | p->next = temp_slots; |
927 | temp_slots = p; | |
928 | } | |
929 | ||
930 | p->in_use = 1; | |
a25d4ba2 | 931 | p->addr_taken = 0; |
e7a84011 | 932 | p->rtl_expr = sequence_rtl_expr; |
a25d4ba2 | 933 | |
d93d4205 MS |
934 | if (keep == 2) |
935 | { | |
936 | p->level = target_temp_slot_level; | |
937 | p->keep = 0; | |
938 | } | |
e5e809f4 JL |
939 | else if (keep == 3) |
940 | { | |
941 | p->level = var_temp_slot_level; | |
942 | p->keep = 0; | |
943 | } | |
d93d4205 MS |
944 | else |
945 | { | |
946 | p->level = temp_slot_level; | |
947 | p->keep = keep; | |
948 | } | |
1995f267 RK |
949 | |
950 | /* We may be reusing an old slot, so clear any MEM flags that may have been | |
951 | set from before. */ | |
952 | RTX_UNCHANGING_P (p->slot) = 0; | |
953 | MEM_IN_STRUCT_P (p->slot) = 0; | |
6f086dfc RS |
954 | return p->slot; |
955 | } | |
638141a6 | 956 | \f |
230f21b4 PB |
957 | /* Assign a temporary of given TYPE. |
958 | KEEP is as for assign_stack_temp. | |
959 | MEMORY_REQUIRED is 1 if the result must be addressable stack memory; | |
b55d9ff8 RK |
960 | it is 0 if a register is OK. |
961 | DONT_PROMOTE is 1 if we should not promote values in register | |
962 | to wider modes. */ | |
230f21b4 PB |
963 | |
964 | rtx | |
b55d9ff8 | 965 | assign_temp (type, keep, memory_required, dont_promote) |
230f21b4 PB |
966 | tree type; |
967 | int keep; | |
968 | int memory_required; | |
b55d9ff8 | 969 | int dont_promote; |
230f21b4 PB |
970 | { |
971 | enum machine_mode mode = TYPE_MODE (type); | |
638141a6 RK |
972 | int unsignedp = TREE_UNSIGNED (type); |
973 | ||
230f21b4 PB |
974 | if (mode == BLKmode || memory_required) |
975 | { | |
e5e809f4 | 976 | HOST_WIDE_INT size = int_size_in_bytes (type); |
230f21b4 PB |
977 | rtx tmp; |
978 | ||
979 | /* Unfortunately, we don't yet know how to allocate variable-sized | |
980 | temporaries. However, sometimes we have a fixed upper limit on | |
981 | the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that | |
0f41302f | 982 | instead. This is the case for Chill variable-sized strings. */ |
230f21b4 PB |
983 | if (size == -1 && TREE_CODE (type) == ARRAY_TYPE |
984 | && TYPE_ARRAY_MAX_SIZE (type) != NULL_TREE | |
985 | && TREE_CODE (TYPE_ARRAY_MAX_SIZE (type)) == INTEGER_CST) | |
986 | size = TREE_INT_CST_LOW (TYPE_ARRAY_MAX_SIZE (type)); | |
987 | ||
988 | tmp = assign_stack_temp (mode, size, keep); | |
989 | MEM_IN_STRUCT_P (tmp) = AGGREGATE_TYPE_P (type); | |
990 | return tmp; | |
991 | } | |
638141a6 | 992 | |
230f21b4 | 993 | #ifndef PROMOTE_FOR_CALL_ONLY |
b55d9ff8 RK |
994 | if (! dont_promote) |
995 | mode = promote_mode (type, mode, &unsignedp, 0); | |
230f21b4 | 996 | #endif |
638141a6 | 997 | |
230f21b4 PB |
998 | return gen_reg_rtx (mode); |
999 | } | |
638141a6 | 1000 | \f |
a45035b6 JW |
1001 | /* Combine temporary stack slots which are adjacent on the stack. |
1002 | ||
1003 | This allows for better use of already allocated stack space. This is only | |
1004 | done for BLKmode slots because we can be sure that we won't have alignment | |
1005 | problems in this case. */ | |
1006 | ||
1007 | void | |
1008 | combine_temp_slots () | |
1009 | { | |
1010 | struct temp_slot *p, *q; | |
1011 | struct temp_slot *prev_p, *prev_q; | |
e5e809f4 JL |
1012 | int num_slots; |
1013 | ||
1014 | /* If there are a lot of temp slots, don't do anything unless | |
1015 | high levels of optimizaton. */ | |
1016 | if (! flag_expensive_optimizations) | |
1017 | for (p = temp_slots, num_slots = 0; p; p = p->next, num_slots++) | |
1018 | if (num_slots > 100 || (num_slots > 10 && optimize == 0)) | |
1019 | return; | |
a45035b6 | 1020 | |
e9b7093a RS |
1021 | for (p = temp_slots, prev_p = 0; p; p = prev_p ? prev_p->next : temp_slots) |
1022 | { | |
1023 | int delete_p = 0; | |
e5e809f4 | 1024 | |
e9b7093a RS |
1025 | if (! p->in_use && GET_MODE (p->slot) == BLKmode) |
1026 | for (q = p->next, prev_q = p; q; q = prev_q->next) | |
a45035b6 | 1027 | { |
e9b7093a RS |
1028 | int delete_q = 0; |
1029 | if (! q->in_use && GET_MODE (q->slot) == BLKmode) | |
a45035b6 | 1030 | { |
fc91b0d0 | 1031 | if (p->base_offset + p->full_size == q->base_offset) |
e9b7093a RS |
1032 | { |
1033 | /* Q comes after P; combine Q into P. */ | |
1034 | p->size += q->size; | |
307d8cd6 | 1035 | p->full_size += q->full_size; |
e9b7093a RS |
1036 | delete_q = 1; |
1037 | } | |
fc91b0d0 | 1038 | else if (q->base_offset + q->full_size == p->base_offset) |
e9b7093a RS |
1039 | { |
1040 | /* P comes after Q; combine P into Q. */ | |
1041 | q->size += p->size; | |
307d8cd6 | 1042 | q->full_size += p->full_size; |
e9b7093a RS |
1043 | delete_p = 1; |
1044 | break; | |
1045 | } | |
a45035b6 | 1046 | } |
e9b7093a RS |
1047 | /* Either delete Q or advance past it. */ |
1048 | if (delete_q) | |
1049 | prev_q->next = q->next; | |
1050 | else | |
1051 | prev_q = q; | |
a45035b6 | 1052 | } |
e9b7093a RS |
1053 | /* Either delete P or advance past it. */ |
1054 | if (delete_p) | |
1055 | { | |
1056 | if (prev_p) | |
1057 | prev_p->next = p->next; | |
1058 | else | |
1059 | temp_slots = p->next; | |
1060 | } | |
1061 | else | |
1062 | prev_p = p; | |
1063 | } | |
a45035b6 | 1064 | } |
6f086dfc | 1065 | \f |
e5e76139 RK |
1066 | /* Find the temp slot corresponding to the object at address X. */ |
1067 | ||
1068 | static struct temp_slot * | |
1069 | find_temp_slot_from_address (x) | |
1070 | rtx x; | |
1071 | { | |
1072 | struct temp_slot *p; | |
1073 | rtx next; | |
1074 | ||
1075 | for (p = temp_slots; p; p = p->next) | |
1076 | { | |
1077 | if (! p->in_use) | |
1078 | continue; | |
e5e809f4 | 1079 | |
e5e76139 | 1080 | else if (XEXP (p->slot, 0) == x |
abb52246 RK |
1081 | || p->address == x |
1082 | || (GET_CODE (x) == PLUS | |
1083 | && XEXP (x, 0) == virtual_stack_vars_rtx | |
1084 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
1085 | && INTVAL (XEXP (x, 1)) >= p->base_offset | |
1086 | && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size)) | |
e5e76139 RK |
1087 | return p; |
1088 | ||
1089 | else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST) | |
1090 | for (next = p->address; next; next = XEXP (next, 1)) | |
1091 | if (XEXP (next, 0) == x) | |
1092 | return p; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
9faa82d8 | 1098 | /* Indicate that NEW is an alternate way of referring to the temp slot |
e5e809f4 | 1099 | that previously was known by OLD. */ |
e5e76139 RK |
1100 | |
1101 | void | |
1102 | update_temp_slot_address (old, new) | |
1103 | rtx old, new; | |
1104 | { | |
1105 | struct temp_slot *p = find_temp_slot_from_address (old); | |
1106 | ||
1107 | /* If none, return. Else add NEW as an alias. */ | |
1108 | if (p == 0) | |
1109 | return; | |
1110 | else if (p->address == 0) | |
1111 | p->address = new; | |
1112 | else | |
1113 | { | |
1114 | if (GET_CODE (p->address) != EXPR_LIST) | |
38a448ca | 1115 | p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX); |
e5e76139 | 1116 | |
38a448ca | 1117 | p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address); |
e5e76139 RK |
1118 | } |
1119 | } | |
1120 | ||
a25d4ba2 | 1121 | /* If X could be a reference to a temporary slot, mark the fact that its |
9faa82d8 | 1122 | address was taken. */ |
a25d4ba2 RK |
1123 | |
1124 | void | |
1125 | mark_temp_addr_taken (x) | |
1126 | rtx x; | |
1127 | { | |
1128 | struct temp_slot *p; | |
1129 | ||
1130 | if (x == 0) | |
1131 | return; | |
1132 | ||
1133 | /* If X is not in memory or is at a constant address, it cannot be in | |
1134 | a temporary slot. */ | |
1135 | if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1136 | return; | |
1137 | ||
1138 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1139 | if (p != 0) | |
1140 | p->addr_taken = 1; | |
1141 | } | |
1142 | ||
9cca6a99 MS |
1143 | /* If X could be a reference to a temporary slot, mark that slot as |
1144 | belonging to the to one level higher than the current level. If X | |
1145 | matched one of our slots, just mark that one. Otherwise, we can't | |
1146 | easily predict which it is, so upgrade all of them. Kept slots | |
1147 | need not be touched. | |
6f086dfc RS |
1148 | |
1149 | This is called when an ({...}) construct occurs and a statement | |
1150 | returns a value in memory. */ | |
1151 | ||
1152 | void | |
1153 | preserve_temp_slots (x) | |
1154 | rtx x; | |
1155 | { | |
a25d4ba2 | 1156 | struct temp_slot *p = 0; |
6f086dfc | 1157 | |
73620b82 RK |
1158 | /* If there is no result, we still might have some objects whose address |
1159 | were taken, so we need to make sure they stay around. */ | |
e3a77161 | 1160 | if (x == 0) |
73620b82 RK |
1161 | { |
1162 | for (p = temp_slots; p; p = p->next) | |
1163 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1164 | p->level--; | |
1165 | ||
1166 | return; | |
1167 | } | |
e3a77161 RK |
1168 | |
1169 | /* If X is a register that is being used as a pointer, see if we have | |
1170 | a temporary slot we know it points to. To be consistent with | |
1171 | the code below, we really should preserve all non-kept slots | |
1172 | if we can't find a match, but that seems to be much too costly. */ | |
a25d4ba2 RK |
1173 | if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))) |
1174 | p = find_temp_slot_from_address (x); | |
1175 | ||
6f086dfc | 1176 | /* If X is not in memory or is at a constant address, it cannot be in |
e19571db RK |
1177 | a temporary slot, but it can contain something whose address was |
1178 | taken. */ | |
a25d4ba2 | 1179 | if (p == 0 && (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))) |
e19571db RK |
1180 | { |
1181 | for (p = temp_slots; p; p = p->next) | |
1182 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1183 | p->level--; | |
1184 | ||
1185 | return; | |
1186 | } | |
6f086dfc RS |
1187 | |
1188 | /* First see if we can find a match. */ | |
73620b82 | 1189 | if (p == 0) |
a25d4ba2 RK |
1190 | p = find_temp_slot_from_address (XEXP (x, 0)); |
1191 | ||
e5e76139 RK |
1192 | if (p != 0) |
1193 | { | |
a25d4ba2 RK |
1194 | /* Move everything at our level whose address was taken to our new |
1195 | level in case we used its address. */ | |
1196 | struct temp_slot *q; | |
1197 | ||
9cca6a99 MS |
1198 | if (p->level == temp_slot_level) |
1199 | { | |
1200 | for (q = temp_slots; q; q = q->next) | |
1201 | if (q != p && q->addr_taken && q->level == p->level) | |
1202 | q->level--; | |
a25d4ba2 | 1203 | |
9cca6a99 MS |
1204 | p->level--; |
1205 | p->addr_taken = 0; | |
1206 | } | |
e5e76139 RK |
1207 | return; |
1208 | } | |
6f086dfc RS |
1209 | |
1210 | /* Otherwise, preserve all non-kept slots at this level. */ | |
1211 | for (p = temp_slots; p; p = p->next) | |
1212 | if (p->in_use && p->level == temp_slot_level && ! p->keep) | |
1213 | p->level--; | |
1214 | } | |
1215 | ||
422c8f63 RK |
1216 | /* X is the result of an RTL_EXPR. If it is a temporary slot associated |
1217 | with that RTL_EXPR, promote it into a temporary slot at the present | |
1218 | level so it will not be freed when we free slots made in the | |
1219 | RTL_EXPR. */ | |
1220 | ||
1221 | void | |
1222 | preserve_rtl_expr_result (x) | |
1223 | rtx x; | |
1224 | { | |
1225 | struct temp_slot *p; | |
1226 | ||
1227 | /* If X is not in memory or is at a constant address, it cannot be in | |
1228 | a temporary slot. */ | |
1229 | if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1230 | return; | |
1231 | ||
199b61d8 RK |
1232 | /* If we can find a match, move it to our level unless it is already at |
1233 | an upper level. */ | |
1234 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1235 | if (p != 0) | |
1236 | { | |
1237 | p->level = MIN (p->level, temp_slot_level); | |
1238 | p->rtl_expr = 0; | |
1239 | } | |
422c8f63 RK |
1240 | |
1241 | return; | |
1242 | } | |
1243 | ||
6f086dfc | 1244 | /* Free all temporaries used so far. This is normally called at the end |
e7a84011 RK |
1245 | of generating code for a statement. Don't free any temporaries |
1246 | currently in use for an RTL_EXPR that hasn't yet been emitted. | |
1247 | We could eventually do better than this since it can be reused while | |
1248 | generating the same RTL_EXPR, but this is complex and probably not | |
1249 | worthwhile. */ | |
6f086dfc RS |
1250 | |
1251 | void | |
1252 | free_temp_slots () | |
1253 | { | |
1254 | struct temp_slot *p; | |
1255 | ||
1256 | for (p = temp_slots; p; p = p->next) | |
e7a84011 RK |
1257 | if (p->in_use && p->level == temp_slot_level && ! p->keep |
1258 | && p->rtl_expr == 0) | |
1259 | p->in_use = 0; | |
1260 | ||
1261 | combine_temp_slots (); | |
1262 | } | |
1263 | ||
1264 | /* Free all temporary slots used in T, an RTL_EXPR node. */ | |
1265 | ||
1266 | void | |
1267 | free_temps_for_rtl_expr (t) | |
1268 | tree t; | |
1269 | { | |
1270 | struct temp_slot *p; | |
1271 | ||
1272 | for (p = temp_slots; p; p = p->next) | |
1273 | if (p->rtl_expr == t) | |
6f086dfc | 1274 | p->in_use = 0; |
a45035b6 JW |
1275 | |
1276 | combine_temp_slots (); | |
6f086dfc RS |
1277 | } |
1278 | ||
956d6950 | 1279 | /* Mark all temporaries ever allocated in this function as not suitable |
a94e4054 RK |
1280 | for reuse until the current level is exited. */ |
1281 | ||
1282 | void | |
1283 | mark_all_temps_used () | |
1284 | { | |
1285 | struct temp_slot *p; | |
1286 | ||
1287 | for (p = temp_slots; p; p = p->next) | |
1288 | { | |
85b119d1 | 1289 | p->in_use = p->keep = 1; |
27ce006b | 1290 | p->level = MIN (p->level, temp_slot_level); |
a94e4054 RK |
1291 | } |
1292 | } | |
1293 | ||
6f086dfc RS |
1294 | /* Push deeper into the nesting level for stack temporaries. */ |
1295 | ||
1296 | void | |
1297 | push_temp_slots () | |
1298 | { | |
6f086dfc RS |
1299 | temp_slot_level++; |
1300 | } | |
1301 | ||
e5e809f4 JL |
1302 | /* Likewise, but save the new level as the place to allocate variables |
1303 | for blocks. */ | |
1304 | ||
1305 | void | |
1306 | push_temp_slots_for_block () | |
1307 | { | |
1308 | push_temp_slots (); | |
1309 | ||
1310 | var_temp_slot_level = temp_slot_level; | |
1311 | } | |
1312 | ||
f5963e61 JL |
1313 | /* Likewise, but save the new level as the place to allocate temporaries |
1314 | for TARGET_EXPRs. */ | |
1315 | ||
1316 | void | |
1317 | push_temp_slots_for_target () | |
1318 | { | |
1319 | push_temp_slots (); | |
1320 | ||
1321 | target_temp_slot_level = temp_slot_level; | |
1322 | } | |
1323 | ||
1324 | /* Set and get the value of target_temp_slot_level. The only | |
1325 | permitted use of these functions is to save and restore this value. */ | |
1326 | ||
1327 | int | |
1328 | get_target_temp_slot_level () | |
1329 | { | |
1330 | return target_temp_slot_level; | |
1331 | } | |
1332 | ||
1333 | void | |
1334 | set_target_temp_slot_level (level) | |
1335 | int level; | |
1336 | { | |
1337 | target_temp_slot_level = level; | |
1338 | } | |
1339 | ||
6f086dfc RS |
1340 | /* Pop a temporary nesting level. All slots in use in the current level |
1341 | are freed. */ | |
1342 | ||
1343 | void | |
1344 | pop_temp_slots () | |
1345 | { | |
1346 | struct temp_slot *p; | |
1347 | ||
6f086dfc | 1348 | for (p = temp_slots; p; p = p->next) |
e7a84011 | 1349 | if (p->in_use && p->level == temp_slot_level && p->rtl_expr == 0) |
6f086dfc RS |
1350 | p->in_use = 0; |
1351 | ||
a45035b6 JW |
1352 | combine_temp_slots (); |
1353 | ||
6f086dfc RS |
1354 | temp_slot_level--; |
1355 | } | |
bc0ebdf9 RK |
1356 | |
1357 | /* Initialize temporary slots. */ | |
1358 | ||
1359 | void | |
1360 | init_temp_slots () | |
1361 | { | |
1362 | /* We have not allocated any temporaries yet. */ | |
1363 | temp_slots = 0; | |
1364 | temp_slot_level = 0; | |
e5e809f4 | 1365 | var_temp_slot_level = 0; |
bc0ebdf9 RK |
1366 | target_temp_slot_level = 0; |
1367 | } | |
6f086dfc RS |
1368 | \f |
1369 | /* Retroactively move an auto variable from a register to a stack slot. | |
1370 | This is done when an address-reference to the variable is seen. */ | |
1371 | ||
1372 | void | |
1373 | put_var_into_stack (decl) | |
1374 | tree decl; | |
1375 | { | |
1376 | register rtx reg; | |
00d8a4c1 | 1377 | enum machine_mode promoted_mode, decl_mode; |
6f086dfc | 1378 | struct function *function = 0; |
c20bf1f3 | 1379 | tree context; |
e9a25f70 | 1380 | int can_use_addressof; |
c20bf1f3 | 1381 | |
c20bf1f3 | 1382 | context = decl_function_context (decl); |
6f086dfc | 1383 | |
9ec36da5 | 1384 | /* Get the current rtl used for this object and its original mode. */ |
6f086dfc | 1385 | reg = TREE_CODE (decl) == SAVE_EXPR ? SAVE_EXPR_RTL (decl) : DECL_RTL (decl); |
2baccce2 RS |
1386 | |
1387 | /* No need to do anything if decl has no rtx yet | |
1388 | since in that case caller is setting TREE_ADDRESSABLE | |
1389 | and a stack slot will be assigned when the rtl is made. */ | |
1390 | if (reg == 0) | |
1391 | return; | |
00d8a4c1 RK |
1392 | |
1393 | /* Get the declared mode for this object. */ | |
1394 | decl_mode = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl)) | |
1395 | : DECL_MODE (decl)); | |
2baccce2 RS |
1396 | /* Get the mode it's actually stored in. */ |
1397 | promoted_mode = GET_MODE (reg); | |
6f086dfc RS |
1398 | |
1399 | /* If this variable comes from an outer function, | |
1400 | find that function's saved context. */ | |
4ac74fb8 | 1401 | if (context != current_function_decl && context != inline_function_decl) |
6f086dfc RS |
1402 | for (function = outer_function_chain; function; function = function->next) |
1403 | if (function->decl == context) | |
1404 | break; | |
1405 | ||
6f086dfc RS |
1406 | /* If this is a variable-size object with a pseudo to address it, |
1407 | put that pseudo into the stack, if the var is nonlocal. */ | |
a82ad570 | 1408 | if (DECL_NONLOCAL (decl) |
6f086dfc RS |
1409 | && GET_CODE (reg) == MEM |
1410 | && GET_CODE (XEXP (reg, 0)) == REG | |
1411 | && REGNO (XEXP (reg, 0)) > LAST_VIRTUAL_REGISTER) | |
4cdb3e78 RS |
1412 | { |
1413 | reg = XEXP (reg, 0); | |
1414 | decl_mode = promoted_mode = GET_MODE (reg); | |
1415 | } | |
e15762df | 1416 | |
e9a25f70 JL |
1417 | can_use_addressof |
1418 | = (function == 0 | |
e5e809f4 | 1419 | && optimize > 0 |
e9a25f70 JL |
1420 | /* FIXME make it work for promoted modes too */ |
1421 | && decl_mode == promoted_mode | |
1422 | #ifdef NON_SAVING_SETJMP | |
1423 | && ! (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
1424 | #endif | |
1425 | ); | |
1426 | ||
1427 | /* If we can't use ADDRESSOF, make sure we see through one we already | |
1428 | generated. */ | |
1429 | if (! can_use_addressof && GET_CODE (reg) == MEM | |
1430 | && GET_CODE (XEXP (reg, 0)) == ADDRESSOF) | |
1431 | reg = XEXP (XEXP (reg, 0), 0); | |
1432 | ||
293e3de4 RS |
1433 | /* Now we should have a value that resides in one or more pseudo regs. */ |
1434 | ||
1435 | if (GET_CODE (reg) == REG) | |
e9a25f70 JL |
1436 | { |
1437 | /* If this variable lives in the current function and we don't need | |
1438 | to put things in the stack for the sake of setjmp, try to keep it | |
1439 | in a register until we know we actually need the address. */ | |
1440 | if (can_use_addressof) | |
1441 | gen_mem_addressof (reg, decl); | |
1442 | else | |
1443 | put_reg_into_stack (function, reg, TREE_TYPE (decl), | |
1444 | promoted_mode, decl_mode, | |
e5e809f4 JL |
1445 | TREE_SIDE_EFFECTS (decl), 0, |
1446 | TREE_USED (decl) | |
1447 | || DECL_INITIAL (decl) != 0); | |
e9a25f70 | 1448 | } |
293e3de4 RS |
1449 | else if (GET_CODE (reg) == CONCAT) |
1450 | { | |
1451 | /* A CONCAT contains two pseudos; put them both in the stack. | |
1452 | We do it so they end up consecutive. */ | |
1453 | enum machine_mode part_mode = GET_MODE (XEXP (reg, 0)); | |
1454 | tree part_type = TREE_TYPE (TREE_TYPE (decl)); | |
4738c10d | 1455 | #ifdef FRAME_GROWS_DOWNWARD |
293e3de4 | 1456 | /* Since part 0 should have a lower address, do it second. */ |
0006e95b | 1457 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 JL |
1458 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
1459 | TREE_USED (decl) || DECL_INITIAL (decl) != 0); | |
0006e95b | 1460 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 JL |
1461 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
1462 | TREE_USED (decl) || DECL_INITIAL (decl) != 0); | |
293e3de4 | 1463 | #else |
0006e95b | 1464 | put_reg_into_stack (function, XEXP (reg, 0), part_type, part_mode, |
e5e809f4 JL |
1465 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
1466 | TREE_USED (decl) || DECL_INITIAL (decl) != 0); | |
0006e95b | 1467 | put_reg_into_stack (function, XEXP (reg, 1), part_type, part_mode, |
e5e809f4 JL |
1468 | part_mode, TREE_SIDE_EFFECTS (decl), 0, |
1469 | TREE_USED (decl) || DECL_INITIAL (decl) != 0); | |
293e3de4 RS |
1470 | #endif |
1471 | ||
1472 | /* Change the CONCAT into a combined MEM for both parts. */ | |
1473 | PUT_CODE (reg, MEM); | |
0006e95b | 1474 | MEM_VOLATILE_P (reg) = MEM_VOLATILE_P (XEXP (reg, 0)); |
41472af8 | 1475 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
0006e95b | 1476 | |
293e3de4 RS |
1477 | /* The two parts are in memory order already. |
1478 | Use the lower parts address as ours. */ | |
1479 | XEXP (reg, 0) = XEXP (XEXP (reg, 0), 0); | |
1480 | /* Prevent sharing of rtl that might lose. */ | |
1481 | if (GET_CODE (XEXP (reg, 0)) == PLUS) | |
1482 | XEXP (reg, 0) = copy_rtx (XEXP (reg, 0)); | |
1483 | } | |
86fa911a RK |
1484 | else |
1485 | return; | |
1486 | ||
1487 | if (flag_check_memory_usage) | |
1488 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, | |
1489 | XEXP (reg, 0), ptr_mode, | |
1490 | GEN_INT (GET_MODE_SIZE (GET_MODE (reg))), | |
1491 | TYPE_MODE (sizetype), | |
956d6950 JL |
1492 | GEN_INT (MEMORY_USE_RW), |
1493 | TYPE_MODE (integer_type_node)); | |
293e3de4 RS |
1494 | } |
1495 | ||
1496 | /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG | |
1497 | into the stack frame of FUNCTION (0 means the current function). | |
1498 | DECL_MODE is the machine mode of the user-level data type. | |
0006e95b | 1499 | PROMOTED_MODE is the machine mode of the register. |
e5e809f4 JL |
1500 | VOLATILE_P is nonzero if this is for a "volatile" decl. |
1501 | USED_P is nonzero if this reg might have already been used in an insn. */ | |
293e3de4 RS |
1502 | |
1503 | static void | |
e9a25f70 | 1504 | put_reg_into_stack (function, reg, type, promoted_mode, decl_mode, volatile_p, |
e5e809f4 | 1505 | original_regno, used_p) |
293e3de4 RS |
1506 | struct function *function; |
1507 | rtx reg; | |
1508 | tree type; | |
1509 | enum machine_mode promoted_mode, decl_mode; | |
0006e95b | 1510 | int volatile_p; |
e9a25f70 | 1511 | int original_regno; |
e5e809f4 | 1512 | int used_p; |
293e3de4 RS |
1513 | { |
1514 | rtx new = 0; | |
e9a25f70 JL |
1515 | int regno = original_regno; |
1516 | ||
1517 | if (regno == 0) | |
1518 | regno = REGNO (reg); | |
6f086dfc RS |
1519 | |
1520 | if (function) | |
1521 | { | |
e9a25f70 JL |
1522 | if (regno < function->max_parm_reg) |
1523 | new = function->parm_reg_stack_loc[regno]; | |
6f086dfc | 1524 | if (new == 0) |
e15762df | 1525 | new = assign_outer_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), |
6f086dfc RS |
1526 | 0, function); |
1527 | } | |
1528 | else | |
1529 | { | |
e9a25f70 JL |
1530 | if (regno < max_parm_reg) |
1531 | new = parm_reg_stack_loc[regno]; | |
6f086dfc | 1532 | if (new == 0) |
e15762df | 1533 | new = assign_stack_local (decl_mode, GET_MODE_SIZE (decl_mode), 0); |
6f086dfc RS |
1534 | } |
1535 | ||
0006e95b | 1536 | PUT_MODE (reg, decl_mode); |
6f086dfc RS |
1537 | XEXP (reg, 0) = XEXP (new, 0); |
1538 | /* `volatil' bit means one thing for MEMs, another entirely for REGs. */ | |
0006e95b | 1539 | MEM_VOLATILE_P (reg) = volatile_p; |
6f086dfc RS |
1540 | PUT_CODE (reg, MEM); |
1541 | ||
1542 | /* If this is a memory ref that contains aggregate components, | |
bdd3e6ab JW |
1543 | mark it as such for cse and loop optimize. If we are reusing a |
1544 | previously generated stack slot, then we need to copy the bit in | |
1545 | case it was set for other reasons. For instance, it is set for | |
1546 | __builtin_va_alist. */ | |
1547 | MEM_IN_STRUCT_P (reg) = AGGREGATE_TYPE_P (type) | MEM_IN_STRUCT_P (new); | |
41472af8 | 1548 | MEM_ALIAS_SET (reg) = get_alias_set (type); |
6f086dfc RS |
1549 | |
1550 | /* Now make sure that all refs to the variable, previously made | |
1551 | when it was a register, are fixed up to be valid again. */ | |
e5e809f4 JL |
1552 | |
1553 | if (used_p && function != 0) | |
6f086dfc RS |
1554 | { |
1555 | struct var_refs_queue *temp; | |
1556 | ||
1557 | /* Variable is inherited; fix it up when we get back to its function. */ | |
1558 | push_obstacks (function->function_obstack, | |
1559 | function->function_maybepermanent_obstack); | |
4da73fa0 RK |
1560 | |
1561 | /* See comment in restore_tree_status in tree.c for why this needs to be | |
1562 | on saveable obstack. */ | |
6f086dfc | 1563 | temp |
4da73fa0 | 1564 | = (struct var_refs_queue *) savealloc (sizeof (struct var_refs_queue)); |
6f086dfc | 1565 | temp->modified = reg; |
00d8a4c1 | 1566 | temp->promoted_mode = promoted_mode; |
293e3de4 | 1567 | temp->unsignedp = TREE_UNSIGNED (type); |
6f086dfc RS |
1568 | temp->next = function->fixup_var_refs_queue; |
1569 | function->fixup_var_refs_queue = temp; | |
1570 | pop_obstacks (); | |
1571 | } | |
e5e809f4 | 1572 | else if (used_p) |
6f086dfc | 1573 | /* Variable is local; fix it up now. */ |
293e3de4 | 1574 | fixup_var_refs (reg, promoted_mode, TREE_UNSIGNED (type)); |
6f086dfc RS |
1575 | } |
1576 | \f | |
1577 | static void | |
00d8a4c1 | 1578 | fixup_var_refs (var, promoted_mode, unsignedp) |
6f086dfc | 1579 | rtx var; |
00d8a4c1 RK |
1580 | enum machine_mode promoted_mode; |
1581 | int unsignedp; | |
6f086dfc RS |
1582 | { |
1583 | tree pending; | |
1584 | rtx first_insn = get_insns (); | |
1585 | struct sequence_stack *stack = sequence_stack; | |
1586 | tree rtl_exps = rtl_expr_chain; | |
1587 | ||
1588 | /* Must scan all insns for stack-refs that exceed the limit. */ | |
00d8a4c1 | 1589 | fixup_var_refs_insns (var, promoted_mode, unsignedp, first_insn, stack == 0); |
6f086dfc RS |
1590 | |
1591 | /* Scan all pending sequences too. */ | |
1592 | for (; stack; stack = stack->next) | |
1593 | { | |
1594 | push_to_sequence (stack->first); | |
00d8a4c1 RK |
1595 | fixup_var_refs_insns (var, promoted_mode, unsignedp, |
1596 | stack->first, stack->next != 0); | |
6f086dfc RS |
1597 | /* Update remembered end of sequence |
1598 | in case we added an insn at the end. */ | |
1599 | stack->last = get_last_insn (); | |
1600 | end_sequence (); | |
1601 | } | |
1602 | ||
1603 | /* Scan all waiting RTL_EXPRs too. */ | |
1604 | for (pending = rtl_exps; pending; pending = TREE_CHAIN (pending)) | |
1605 | { | |
1606 | rtx seq = RTL_EXPR_SEQUENCE (TREE_VALUE (pending)); | |
1607 | if (seq != const0_rtx && seq != 0) | |
1608 | { | |
1609 | push_to_sequence (seq); | |
00d8a4c1 | 1610 | fixup_var_refs_insns (var, promoted_mode, unsignedp, seq, 0); |
6f086dfc RS |
1611 | end_sequence (); |
1612 | } | |
1613 | } | |
1614 | } | |
1615 | \f | |
e15679f8 | 1616 | /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is |
6f086dfc | 1617 | some part of an insn. Return a struct fixup_replacement whose OLD |
0f41302f | 1618 | value is equal to X. Allocate a new structure if no such entry exists. */ |
6f086dfc RS |
1619 | |
1620 | static struct fixup_replacement * | |
2740a678 | 1621 | find_fixup_replacement (replacements, x) |
6f086dfc RS |
1622 | struct fixup_replacement **replacements; |
1623 | rtx x; | |
1624 | { | |
1625 | struct fixup_replacement *p; | |
1626 | ||
1627 | /* See if we have already replaced this. */ | |
1628 | for (p = *replacements; p && p->old != x; p = p->next) | |
1629 | ; | |
1630 | ||
1631 | if (p == 0) | |
1632 | { | |
1633 | p = (struct fixup_replacement *) oballoc (sizeof (struct fixup_replacement)); | |
1634 | p->old = x; | |
1635 | p->new = 0; | |
1636 | p->next = *replacements; | |
1637 | *replacements = p; | |
1638 | } | |
1639 | ||
1640 | return p; | |
1641 | } | |
1642 | ||
1643 | /* Scan the insn-chain starting with INSN for refs to VAR | |
1644 | and fix them up. TOPLEVEL is nonzero if this chain is the | |
1645 | main chain of insns for the current function. */ | |
1646 | ||
1647 | static void | |
00d8a4c1 | 1648 | fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel) |
6f086dfc | 1649 | rtx var; |
00d8a4c1 RK |
1650 | enum machine_mode promoted_mode; |
1651 | int unsignedp; | |
6f086dfc RS |
1652 | rtx insn; |
1653 | int toplevel; | |
1654 | { | |
02a10449 RK |
1655 | rtx call_dest = 0; |
1656 | ||
6f086dfc RS |
1657 | while (insn) |
1658 | { | |
1659 | rtx next = NEXT_INSN (insn); | |
e5e809f4 | 1660 | rtx set, prev, prev_set; |
6f086dfc | 1661 | rtx note; |
e5e809f4 | 1662 | |
e15762df | 1663 | if (GET_RTX_CLASS (GET_CODE (insn)) == 'i') |
6f086dfc | 1664 | { |
63770d6a RK |
1665 | /* If this is a CLOBBER of VAR, delete it. |
1666 | ||
1667 | If it has a REG_LIBCALL note, delete the REG_LIBCALL | |
1668 | and REG_RETVAL notes too. */ | |
926d1ca5 | 1669 | if (GET_CODE (PATTERN (insn)) == CLOBBER |
07362cb3 JW |
1670 | && (XEXP (PATTERN (insn), 0) == var |
1671 | || (GET_CODE (XEXP (PATTERN (insn), 0)) == CONCAT | |
1672 | && (XEXP (XEXP (PATTERN (insn), 0), 0) == var | |
1673 | || XEXP (XEXP (PATTERN (insn), 0), 1) == var)))) | |
63770d6a RK |
1674 | { |
1675 | if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0) | |
1676 | /* The REG_LIBCALL note will go away since we are going to | |
1677 | turn INSN into a NOTE, so just delete the | |
1678 | corresponding REG_RETVAL note. */ | |
1679 | remove_note (XEXP (note, 0), | |
1680 | find_reg_note (XEXP (note, 0), REG_RETVAL, | |
1681 | NULL_RTX)); | |
1682 | ||
1683 | /* In unoptimized compilation, we shouldn't call delete_insn | |
1684 | except in jump.c doing warnings. */ | |
1685 | PUT_CODE (insn, NOTE); | |
1686 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1687 | NOTE_SOURCE_FILE (insn) = 0; | |
1688 | } | |
1689 | ||
6f086dfc | 1690 | /* The insn to load VAR from a home in the arglist |
e5e809f4 JL |
1691 | is now a no-op. When we see it, just delete it. |
1692 | Similarly if this is storing VAR from a register from which | |
1693 | it was loaded in the previous insn. This will occur | |
1694 | when an ADDRESSOF was made for an arglist slot. */ | |
63770d6a | 1695 | else if (toplevel |
e5e809f4 JL |
1696 | && (set = single_set (insn)) != 0 |
1697 | && SET_DEST (set) == var | |
63770d6a RK |
1698 | /* If this represents the result of an insn group, |
1699 | don't delete the insn. */ | |
1700 | && find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0 | |
e5e809f4 JL |
1701 | && (rtx_equal_p (SET_SRC (set), var) |
1702 | || (GET_CODE (SET_SRC (set)) == REG | |
1703 | && (prev = prev_nonnote_insn (insn)) != 0 | |
1704 | && (prev_set = single_set (prev)) != 0 | |
1705 | && SET_DEST (prev_set) == SET_SRC (set) | |
1706 | && rtx_equal_p (SET_SRC (prev_set), var)))) | |
6f086dfc | 1707 | { |
b4ff474c RS |
1708 | /* In unoptimized compilation, we shouldn't call delete_insn |
1709 | except in jump.c doing warnings. */ | |
1710 | PUT_CODE (insn, NOTE); | |
1711 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1712 | NOTE_SOURCE_FILE (insn) = 0; | |
6f086dfc RS |
1713 | if (insn == last_parm_insn) |
1714 | last_parm_insn = PREV_INSN (next); | |
1715 | } | |
1716 | else | |
1717 | { | |
02a10449 RK |
1718 | struct fixup_replacement *replacements = 0; |
1719 | rtx next_insn = NEXT_INSN (insn); | |
1720 | ||
e9a25f70 JL |
1721 | if (SMALL_REGISTER_CLASSES) |
1722 | { | |
1723 | /* If the insn that copies the results of a CALL_INSN | |
1724 | into a pseudo now references VAR, we have to use an | |
1725 | intermediate pseudo since we want the life of the | |
1726 | return value register to be only a single insn. | |
02a10449 | 1727 | |
e9a25f70 JL |
1728 | If we don't use an intermediate pseudo, such things as |
1729 | address computations to make the address of VAR valid | |
1730 | if it is not can be placed between the CALL_INSN and INSN. | |
02a10449 | 1731 | |
e9a25f70 JL |
1732 | To make sure this doesn't happen, we record the destination |
1733 | of the CALL_INSN and see if the next insn uses both that | |
1734 | and VAR. */ | |
02a10449 | 1735 | |
f95182a4 ILT |
1736 | if (call_dest != 0 && GET_CODE (insn) == INSN |
1737 | && reg_mentioned_p (var, PATTERN (insn)) | |
1738 | && reg_mentioned_p (call_dest, PATTERN (insn))) | |
1739 | { | |
1740 | rtx temp = gen_reg_rtx (GET_MODE (call_dest)); | |
02a10449 | 1741 | |
f95182a4 | 1742 | emit_insn_before (gen_move_insn (temp, call_dest), insn); |
02a10449 | 1743 | |
f95182a4 ILT |
1744 | PATTERN (insn) = replace_rtx (PATTERN (insn), |
1745 | call_dest, temp); | |
1746 | } | |
02a10449 | 1747 | |
f95182a4 ILT |
1748 | if (GET_CODE (insn) == CALL_INSN |
1749 | && GET_CODE (PATTERN (insn)) == SET) | |
1750 | call_dest = SET_DEST (PATTERN (insn)); | |
1751 | else if (GET_CODE (insn) == CALL_INSN | |
1752 | && GET_CODE (PATTERN (insn)) == PARALLEL | |
1753 | && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET) | |
1754 | call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0)); | |
1755 | else | |
1756 | call_dest = 0; | |
1757 | } | |
02a10449 | 1758 | |
6f086dfc RS |
1759 | /* See if we have to do anything to INSN now that VAR is in |
1760 | memory. If it needs to be loaded into a pseudo, use a single | |
1761 | pseudo for the entire insn in case there is a MATCH_DUP | |
1762 | between two operands. We pass a pointer to the head of | |
1763 | a list of struct fixup_replacements. If fixup_var_refs_1 | |
1764 | needs to allocate pseudos or replacement MEMs (for SUBREGs), | |
1765 | it will record them in this list. | |
1766 | ||
1767 | If it allocated a pseudo for any replacement, we copy into | |
1768 | it here. */ | |
1769 | ||
00d8a4c1 RK |
1770 | fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn, |
1771 | &replacements); | |
6f086dfc | 1772 | |
77121fee JW |
1773 | /* If this is last_parm_insn, and any instructions were output |
1774 | after it to fix it up, then we must set last_parm_insn to | |
1775 | the last such instruction emitted. */ | |
1776 | if (insn == last_parm_insn) | |
1777 | last_parm_insn = PREV_INSN (next_insn); | |
1778 | ||
6f086dfc RS |
1779 | while (replacements) |
1780 | { | |
1781 | if (GET_CODE (replacements->new) == REG) | |
1782 | { | |
1783 | rtx insert_before; | |
00d8a4c1 | 1784 | rtx seq; |
6f086dfc RS |
1785 | |
1786 | /* OLD might be a (subreg (mem)). */ | |
1787 | if (GET_CODE (replacements->old) == SUBREG) | |
1788 | replacements->old | |
1789 | = fixup_memory_subreg (replacements->old, insn, 0); | |
1790 | else | |
1791 | replacements->old | |
1792 | = fixup_stack_1 (replacements->old, insn); | |
1793 | ||
5fa7422b | 1794 | insert_before = insn; |
6f086dfc | 1795 | |
00d8a4c1 RK |
1796 | /* If we are changing the mode, do a conversion. |
1797 | This might be wasteful, but combine.c will | |
1798 | eliminate much of the waste. */ | |
1799 | ||
1800 | if (GET_MODE (replacements->new) | |
1801 | != GET_MODE (replacements->old)) | |
1802 | { | |
1803 | start_sequence (); | |
1804 | convert_move (replacements->new, | |
1805 | replacements->old, unsignedp); | |
1806 | seq = gen_sequence (); | |
1807 | end_sequence (); | |
1808 | } | |
1809 | else | |
1810 | seq = gen_move_insn (replacements->new, | |
1811 | replacements->old); | |
1812 | ||
1813 | emit_insn_before (seq, insert_before); | |
6f086dfc RS |
1814 | } |
1815 | ||
1816 | replacements = replacements->next; | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /* Also fix up any invalid exprs in the REG_NOTES of this insn. | |
1821 | But don't touch other insns referred to by reg-notes; | |
1822 | we will get them elsewhere. */ | |
1823 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
1824 | if (GET_CODE (note) != INSN_LIST) | |
ab6155b7 RK |
1825 | XEXP (note, 0) |
1826 | = walk_fixup_memory_subreg (XEXP (note, 0), insn, 1); | |
6f086dfc RS |
1827 | } |
1828 | insn = next; | |
1829 | } | |
1830 | } | |
1831 | \f | |
00d8a4c1 RK |
1832 | /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE. |
1833 | See if the rtx expression at *LOC in INSN needs to be changed. | |
6f086dfc RS |
1834 | |
1835 | REPLACEMENTS is a pointer to a list head that starts out zero, but may | |
1836 | contain a list of original rtx's and replacements. If we find that we need | |
1837 | to modify this insn by replacing a memory reference with a pseudo or by | |
1838 | making a new MEM to implement a SUBREG, we consult that list to see if | |
1839 | we have already chosen a replacement. If none has already been allocated, | |
1840 | we allocate it and update the list. fixup_var_refs_insns will copy VAR | |
1841 | or the SUBREG, as appropriate, to the pseudo. */ | |
1842 | ||
1843 | static void | |
00d8a4c1 | 1844 | fixup_var_refs_1 (var, promoted_mode, loc, insn, replacements) |
6f086dfc | 1845 | register rtx var; |
00d8a4c1 | 1846 | enum machine_mode promoted_mode; |
6f086dfc RS |
1847 | register rtx *loc; |
1848 | rtx insn; | |
1849 | struct fixup_replacement **replacements; | |
1850 | { | |
1851 | register int i; | |
1852 | register rtx x = *loc; | |
1853 | RTX_CODE code = GET_CODE (x); | |
1854 | register char *fmt; | |
1855 | register rtx tem, tem1; | |
1856 | struct fixup_replacement *replacement; | |
1857 | ||
1858 | switch (code) | |
1859 | { | |
e9a25f70 JL |
1860 | case ADDRESSOF: |
1861 | if (XEXP (x, 0) == var) | |
1862 | { | |
956d6950 JL |
1863 | /* Prevent sharing of rtl that might lose. */ |
1864 | rtx sub = copy_rtx (XEXP (var, 0)); | |
1865 | ||
e9a25f70 | 1866 | start_sequence (); |
956d6950 JL |
1867 | |
1868 | if (! validate_change (insn, loc, sub, 0)) | |
1869 | { | |
1870 | rtx y = force_operand (sub, NULL_RTX); | |
1871 | ||
1872 | if (! validate_change (insn, loc, y, 0)) | |
1873 | *loc = copy_to_reg (y); | |
1874 | } | |
1875 | ||
e9a25f70 JL |
1876 | emit_insn_before (gen_sequence (), insn); |
1877 | end_sequence (); | |
1878 | } | |
1879 | return; | |
1880 | ||
6f086dfc RS |
1881 | case MEM: |
1882 | if (var == x) | |
1883 | { | |
1884 | /* If we already have a replacement, use it. Otherwise, | |
1885 | try to fix up this address in case it is invalid. */ | |
1886 | ||
2740a678 | 1887 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
1888 | if (replacement->new) |
1889 | { | |
1890 | *loc = replacement->new; | |
1891 | return; | |
1892 | } | |
1893 | ||
1894 | *loc = replacement->new = x = fixup_stack_1 (x, insn); | |
1895 | ||
00d8a4c1 RK |
1896 | /* Unless we are forcing memory to register or we changed the mode, |
1897 | we can leave things the way they are if the insn is valid. */ | |
6f086dfc RS |
1898 | |
1899 | INSN_CODE (insn) = -1; | |
00d8a4c1 RK |
1900 | if (! flag_force_mem && GET_MODE (x) == promoted_mode |
1901 | && recog_memoized (insn) >= 0) | |
6f086dfc RS |
1902 | return; |
1903 | ||
00d8a4c1 | 1904 | *loc = replacement->new = gen_reg_rtx (promoted_mode); |
6f086dfc RS |
1905 | return; |
1906 | } | |
1907 | ||
1908 | /* If X contains VAR, we need to unshare it here so that we update | |
1909 | each occurrence separately. But all identical MEMs in one insn | |
1910 | must be replaced with the same rtx because of the possibility of | |
1911 | MATCH_DUPs. */ | |
1912 | ||
1913 | if (reg_mentioned_p (var, x)) | |
1914 | { | |
2740a678 | 1915 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
1916 | if (replacement->new == 0) |
1917 | replacement->new = copy_most_rtx (x, var); | |
1918 | ||
1919 | *loc = x = replacement->new; | |
1920 | } | |
1921 | break; | |
1922 | ||
1923 | case REG: | |
1924 | case CC0: | |
1925 | case PC: | |
1926 | case CONST_INT: | |
1927 | case CONST: | |
1928 | case SYMBOL_REF: | |
1929 | case LABEL_REF: | |
1930 | case CONST_DOUBLE: | |
1931 | return; | |
1932 | ||
1933 | case SIGN_EXTRACT: | |
1934 | case ZERO_EXTRACT: | |
1935 | /* Note that in some cases those types of expressions are altered | |
1936 | by optimize_bit_field, and do not survive to get here. */ | |
1937 | if (XEXP (x, 0) == var | |
1938 | || (GET_CODE (XEXP (x, 0)) == SUBREG | |
1939 | && SUBREG_REG (XEXP (x, 0)) == var)) | |
1940 | { | |
1941 | /* Get TEM as a valid MEM in the mode presently in the insn. | |
1942 | ||
1943 | We don't worry about the possibility of MATCH_DUP here; it | |
1944 | is highly unlikely and would be tricky to handle. */ | |
1945 | ||
1946 | tem = XEXP (x, 0); | |
1947 | if (GET_CODE (tem) == SUBREG) | |
0e09cc26 RK |
1948 | { |
1949 | if (GET_MODE_BITSIZE (GET_MODE (tem)) | |
1950 | > GET_MODE_BITSIZE (GET_MODE (var))) | |
1951 | { | |
1952 | replacement = find_fixup_replacement (replacements, var); | |
1953 | if (replacement->new == 0) | |
1954 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
1955 | SUBREG_REG (tem) = replacement->new; | |
1956 | } | |
ef933d26 RK |
1957 | else |
1958 | tem = fixup_memory_subreg (tem, insn, 0); | |
0e09cc26 RK |
1959 | } |
1960 | else | |
1961 | tem = fixup_stack_1 (tem, insn); | |
6f086dfc RS |
1962 | |
1963 | /* Unless we want to load from memory, get TEM into the proper mode | |
1964 | for an extract from memory. This can only be done if the | |
1965 | extract is at a constant position and length. */ | |
1966 | ||
1967 | if (! flag_force_mem && GET_CODE (XEXP (x, 1)) == CONST_INT | |
1968 | && GET_CODE (XEXP (x, 2)) == CONST_INT | |
1969 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
1970 | && ! MEM_VOLATILE_P (tem)) | |
1971 | { | |
1972 | enum machine_mode wanted_mode = VOIDmode; | |
1973 | enum machine_mode is_mode = GET_MODE (tem); | |
e5e809f4 | 1974 | HOST_WIDE_INT pos = INTVAL (XEXP (x, 2)); |
6f086dfc RS |
1975 | |
1976 | #ifdef HAVE_extzv | |
1977 | if (GET_CODE (x) == ZERO_EXTRACT) | |
0d8e55d8 JL |
1978 | { |
1979 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extzv][1]; | |
1980 | if (wanted_mode == VOIDmode) | |
1981 | wanted_mode = word_mode; | |
1982 | } | |
6f086dfc RS |
1983 | #endif |
1984 | #ifdef HAVE_extv | |
1985 | if (GET_CODE (x) == SIGN_EXTRACT) | |
0d8e55d8 JL |
1986 | { |
1987 | wanted_mode = insn_operand_mode[(int) CODE_FOR_extv][1]; | |
1988 | if (wanted_mode == VOIDmode) | |
1989 | wanted_mode = word_mode; | |
1990 | } | |
6f086dfc | 1991 | #endif |
6dc42e49 | 1992 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
1993 | if (wanted_mode != VOIDmode |
1994 | && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) | |
1995 | { | |
e5e809f4 | 1996 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
1997 | rtx old_pos = XEXP (x, 2); |
1998 | rtx newmem; | |
1999 | ||
2000 | /* If the bytes and bits are counted differently, we | |
2001 | must adjust the offset. */ | |
f76b9db2 ILT |
2002 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2003 | offset = (GET_MODE_SIZE (is_mode) | |
2004 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2005 | |
2006 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2007 | ||
38a448ca RH |
2008 | newmem = gen_rtx_MEM (wanted_mode, |
2009 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc RS |
2010 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
2011 | MEM_VOLATILE_P (newmem) = MEM_VOLATILE_P (tem); | |
2012 | MEM_IN_STRUCT_P (newmem) = MEM_IN_STRUCT_P (tem); | |
2013 | ||
2014 | /* Make the change and see if the insn remains valid. */ | |
2015 | INSN_CODE (insn) = -1; | |
2016 | XEXP (x, 0) = newmem; | |
5f4f0e22 | 2017 | XEXP (x, 2) = GEN_INT (pos); |
6f086dfc RS |
2018 | |
2019 | if (recog_memoized (insn) >= 0) | |
2020 | return; | |
2021 | ||
2022 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2023 | restored later. */ | |
2024 | XEXP (x, 2) = old_pos; | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /* If we get here, the bitfield extract insn can't accept a memory | |
2029 | reference. Copy the input into a register. */ | |
2030 | ||
2031 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2032 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2033 | XEXP (x, 0) = tem1; | |
2034 | return; | |
2035 | } | |
2036 | break; | |
2037 | ||
2038 | case SUBREG: | |
2039 | if (SUBREG_REG (x) == var) | |
2040 | { | |
00d8a4c1 RK |
2041 | /* If this is a special SUBREG made because VAR was promoted |
2042 | from a wider mode, replace it with VAR and call ourself | |
2043 | recursively, this time saying that the object previously | |
2044 | had its current mode (by virtue of the SUBREG). */ | |
2045 | ||
2046 | if (SUBREG_PROMOTED_VAR_P (x)) | |
2047 | { | |
2048 | *loc = var; | |
2049 | fixup_var_refs_1 (var, GET_MODE (var), loc, insn, replacements); | |
2050 | return; | |
2051 | } | |
2052 | ||
6f086dfc RS |
2053 | /* If this SUBREG makes VAR wider, it has become a paradoxical |
2054 | SUBREG with VAR in memory, but these aren't allowed at this | |
2055 | stage of the compilation. So load VAR into a pseudo and take | |
2056 | a SUBREG of that pseudo. */ | |
2057 | if (GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (var))) | |
2058 | { | |
2740a678 | 2059 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
2060 | if (replacement->new == 0) |
2061 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2062 | SUBREG_REG (x) = replacement->new; | |
2063 | return; | |
2064 | } | |
2065 | ||
2066 | /* See if we have already found a replacement for this SUBREG. | |
2067 | If so, use it. Otherwise, make a MEM and see if the insn | |
2068 | is recognized. If not, or if we should force MEM into a register, | |
2069 | make a pseudo for this SUBREG. */ | |
2740a678 | 2070 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
2071 | if (replacement->new) |
2072 | { | |
2073 | *loc = replacement->new; | |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | replacement->new = *loc = fixup_memory_subreg (x, insn, 0); | |
2078 | ||
f898f031 | 2079 | INSN_CODE (insn) = -1; |
6f086dfc RS |
2080 | if (! flag_force_mem && recog_memoized (insn) >= 0) |
2081 | return; | |
2082 | ||
2083 | *loc = replacement->new = gen_reg_rtx (GET_MODE (x)); | |
2084 | return; | |
2085 | } | |
2086 | break; | |
2087 | ||
2088 | case SET: | |
2089 | /* First do special simplification of bit-field references. */ | |
2090 | if (GET_CODE (SET_DEST (x)) == SIGN_EXTRACT | |
2091 | || GET_CODE (SET_DEST (x)) == ZERO_EXTRACT) | |
2092 | optimize_bit_field (x, insn, 0); | |
2093 | if (GET_CODE (SET_SRC (x)) == SIGN_EXTRACT | |
2094 | || GET_CODE (SET_SRC (x)) == ZERO_EXTRACT) | |
5f4f0e22 | 2095 | optimize_bit_field (x, insn, NULL_PTR); |
6f086dfc | 2096 | |
0e09cc26 RK |
2097 | /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object |
2098 | into a register and then store it back out. */ | |
2099 | if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT | |
2100 | && GET_CODE (XEXP (SET_DEST (x), 0)) == SUBREG | |
2101 | && SUBREG_REG (XEXP (SET_DEST (x), 0)) == var | |
2102 | && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x), 0))) | |
2103 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2104 | { | |
2105 | replacement = find_fixup_replacement (replacements, var); | |
2106 | if (replacement->new == 0) | |
2107 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2108 | ||
2109 | SUBREG_REG (XEXP (SET_DEST (x), 0)) = replacement->new; | |
2110 | emit_insn_after (gen_move_insn (var, replacement->new), insn); | |
2111 | } | |
2112 | ||
6f086dfc | 2113 | /* If SET_DEST is now a paradoxical SUBREG, put the result of this |
0f41302f | 2114 | insn into a pseudo and store the low part of the pseudo into VAR. */ |
6f086dfc RS |
2115 | if (GET_CODE (SET_DEST (x)) == SUBREG |
2116 | && SUBREG_REG (SET_DEST (x)) == var | |
2117 | && (GET_MODE_SIZE (GET_MODE (SET_DEST (x))) | |
2118 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2119 | { | |
2120 | SET_DEST (x) = tem = gen_reg_rtx (GET_MODE (SET_DEST (x))); | |
2121 | emit_insn_after (gen_move_insn (var, gen_lowpart (GET_MODE (var), | |
2122 | tem)), | |
2123 | insn); | |
2124 | break; | |
2125 | } | |
2126 | ||
2127 | { | |
2128 | rtx dest = SET_DEST (x); | |
2129 | rtx src = SET_SRC (x); | |
29a82058 | 2130 | #ifdef HAVE_insv |
6f086dfc | 2131 | rtx outerdest = dest; |
29a82058 | 2132 | #endif |
6f086dfc RS |
2133 | |
2134 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART | |
2135 | || GET_CODE (dest) == SIGN_EXTRACT | |
2136 | || GET_CODE (dest) == ZERO_EXTRACT) | |
2137 | dest = XEXP (dest, 0); | |
2138 | ||
2139 | if (GET_CODE (src) == SUBREG) | |
2140 | src = XEXP (src, 0); | |
2141 | ||
2142 | /* If VAR does not appear at the top level of the SET | |
2143 | just scan the lower levels of the tree. */ | |
2144 | ||
2145 | if (src != var && dest != var) | |
2146 | break; | |
2147 | ||
2148 | /* We will need to rerecognize this insn. */ | |
2149 | INSN_CODE (insn) = -1; | |
2150 | ||
2151 | #ifdef HAVE_insv | |
2152 | if (GET_CODE (outerdest) == ZERO_EXTRACT && dest == var) | |
2153 | { | |
2154 | /* Since this case will return, ensure we fixup all the | |
2155 | operands here. */ | |
00d8a4c1 RK |
2156 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 1), |
2157 | insn, replacements); | |
2158 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 2), | |
2159 | insn, replacements); | |
2160 | fixup_var_refs_1 (var, promoted_mode, &SET_SRC (x), | |
2161 | insn, replacements); | |
6f086dfc RS |
2162 | |
2163 | tem = XEXP (outerdest, 0); | |
2164 | ||
2165 | /* Clean up (SUBREG:SI (MEM:mode ...) 0) | |
2166 | that may appear inside a ZERO_EXTRACT. | |
2167 | This was legitimate when the MEM was a REG. */ | |
2168 | if (GET_CODE (tem) == SUBREG | |
2169 | && SUBREG_REG (tem) == var) | |
0e09cc26 | 2170 | tem = fixup_memory_subreg (tem, insn, 0); |
6f086dfc RS |
2171 | else |
2172 | tem = fixup_stack_1 (tem, insn); | |
2173 | ||
2174 | if (GET_CODE (XEXP (outerdest, 1)) == CONST_INT | |
2175 | && GET_CODE (XEXP (outerdest, 2)) == CONST_INT | |
2176 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2177 | && ! MEM_VOLATILE_P (tem)) | |
2178 | { | |
0d8e55d8 | 2179 | enum machine_mode wanted_mode; |
6f086dfc | 2180 | enum machine_mode is_mode = GET_MODE (tem); |
e5e809f4 | 2181 | HOST_WIDE_INT pos = INTVAL (XEXP (outerdest, 2)); |
6f086dfc | 2182 | |
0d8e55d8 JL |
2183 | wanted_mode = insn_operand_mode[(int) CODE_FOR_insv][0]; |
2184 | if (wanted_mode == VOIDmode) | |
2185 | wanted_mode = word_mode; | |
2186 | ||
6dc42e49 | 2187 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2188 | if (GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) |
2189 | { | |
e5e809f4 | 2190 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2191 | rtx old_pos = XEXP (outerdest, 2); |
2192 | rtx newmem; | |
2193 | ||
f76b9db2 ILT |
2194 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2195 | offset = (GET_MODE_SIZE (is_mode) | |
2196 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2197 | |
2198 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2199 | ||
38a448ca RH |
2200 | newmem = gen_rtx_MEM (wanted_mode, |
2201 | plus_constant (XEXP (tem, 0), offset)); | |
6f086dfc RS |
2202 | RTX_UNCHANGING_P (newmem) = RTX_UNCHANGING_P (tem); |
2203 | MEM_VOLATILE_P (newmem) = MEM_VOLATILE_P (tem); | |
2204 | MEM_IN_STRUCT_P (newmem) = MEM_IN_STRUCT_P (tem); | |
2205 | ||
2206 | /* Make the change and see if the insn remains valid. */ | |
2207 | INSN_CODE (insn) = -1; | |
2208 | XEXP (outerdest, 0) = newmem; | |
5f4f0e22 | 2209 | XEXP (outerdest, 2) = GEN_INT (pos); |
6f086dfc RS |
2210 | |
2211 | if (recog_memoized (insn) >= 0) | |
2212 | return; | |
2213 | ||
2214 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2215 | restored later. */ | |
2216 | XEXP (outerdest, 2) = old_pos; | |
2217 | } | |
2218 | } | |
2219 | ||
2220 | /* If we get here, the bit-field store doesn't allow memory | |
2221 | or isn't located at a constant position. Load the value into | |
2222 | a register, do the store, and put it back into memory. */ | |
2223 | ||
2224 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2225 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2226 | emit_insn_after (gen_move_insn (tem, tem1), insn); | |
2227 | XEXP (outerdest, 0) = tem1; | |
2228 | return; | |
2229 | } | |
2230 | #endif | |
2231 | ||
2232 | /* STRICT_LOW_PART is a no-op on memory references | |
2233 | and it can cause combinations to be unrecognizable, | |
2234 | so eliminate it. */ | |
2235 | ||
2236 | if (dest == var && GET_CODE (SET_DEST (x)) == STRICT_LOW_PART) | |
2237 | SET_DEST (x) = XEXP (SET_DEST (x), 0); | |
2238 | ||
2239 | /* A valid insn to copy VAR into or out of a register | |
2240 | must be left alone, to avoid an infinite loop here. | |
2241 | If the reference to VAR is by a subreg, fix that up, | |
2242 | since SUBREG is not valid for a memref. | |
e15762df RK |
2243 | Also fix up the address of the stack slot. |
2244 | ||
2245 | Note that we must not try to recognize the insn until | |
2246 | after we know that we have valid addresses and no | |
2247 | (subreg (mem ...) ...) constructs, since these interfere | |
2248 | with determining the validity of the insn. */ | |
6f086dfc RS |
2249 | |
2250 | if ((SET_SRC (x) == var | |
2251 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2252 | && SUBREG_REG (SET_SRC (x)) == var)) | |
2253 | && (GET_CODE (SET_DEST (x)) == REG | |
2254 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2255 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG)) | |
1d273bf5 | 2256 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2257 | && x == single_set (insn)) |
6f086dfc | 2258 | { |
e15762df RK |
2259 | rtx pat; |
2260 | ||
2740a678 | 2261 | replacement = find_fixup_replacement (replacements, SET_SRC (x)); |
6f086dfc | 2262 | if (replacement->new) |
6f086dfc | 2263 | SET_SRC (x) = replacement->new; |
6f086dfc RS |
2264 | else if (GET_CODE (SET_SRC (x)) == SUBREG) |
2265 | SET_SRC (x) = replacement->new | |
2266 | = fixup_memory_subreg (SET_SRC (x), insn, 0); | |
2267 | else | |
2268 | SET_SRC (x) = replacement->new | |
2269 | = fixup_stack_1 (SET_SRC (x), insn); | |
e15762df RK |
2270 | |
2271 | if (recog_memoized (insn) >= 0) | |
2272 | return; | |
2273 | ||
2274 | /* INSN is not valid, but we know that we want to | |
2275 | copy SET_SRC (x) to SET_DEST (x) in some way. So | |
2276 | we generate the move and see whether it requires more | |
2277 | than one insn. If it does, we emit those insns and | |
2278 | delete INSN. Otherwise, we an just replace the pattern | |
2279 | of INSN; we have already verified above that INSN has | |
2280 | no other function that to do X. */ | |
2281 | ||
2282 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2283 | if (GET_CODE (pat) == SEQUENCE) | |
2284 | { | |
2285 | emit_insn_after (pat, insn); | |
2286 | PUT_CODE (insn, NOTE); | |
2287 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2288 | NOTE_SOURCE_FILE (insn) = 0; | |
2289 | } | |
2290 | else | |
2291 | PATTERN (insn) = pat; | |
2292 | ||
6f086dfc RS |
2293 | return; |
2294 | } | |
2295 | ||
2296 | if ((SET_DEST (x) == var | |
2297 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2298 | && SUBREG_REG (SET_DEST (x)) == var)) | |
2299 | && (GET_CODE (SET_SRC (x)) == REG | |
2300 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2301 | && GET_CODE (SUBREG_REG (SET_SRC (x))) == REG)) | |
1d273bf5 | 2302 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2303 | && x == single_set (insn)) |
6f086dfc | 2304 | { |
e15762df RK |
2305 | rtx pat; |
2306 | ||
6f086dfc RS |
2307 | if (GET_CODE (SET_DEST (x)) == SUBREG) |
2308 | SET_DEST (x) = fixup_memory_subreg (SET_DEST (x), insn, 0); | |
2309 | else | |
2310 | SET_DEST (x) = fixup_stack_1 (SET_DEST (x), insn); | |
e15762df RK |
2311 | |
2312 | if (recog_memoized (insn) >= 0) | |
2313 | return; | |
2314 | ||
2315 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2316 | if (GET_CODE (pat) == SEQUENCE) | |
2317 | { | |
2318 | emit_insn_after (pat, insn); | |
2319 | PUT_CODE (insn, NOTE); | |
2320 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
2321 | NOTE_SOURCE_FILE (insn) = 0; | |
2322 | } | |
2323 | else | |
2324 | PATTERN (insn) = pat; | |
2325 | ||
6f086dfc RS |
2326 | return; |
2327 | } | |
2328 | ||
2329 | /* Otherwise, storing into VAR must be handled specially | |
2330 | by storing into a temporary and copying that into VAR | |
00d8a4c1 RK |
2331 | with a new insn after this one. Note that this case |
2332 | will be used when storing into a promoted scalar since | |
2333 | the insn will now have different modes on the input | |
2334 | and output and hence will be invalid (except for the case | |
2335 | of setting it to a constant, which does not need any | |
2336 | change if it is valid). We generate extra code in that case, | |
2337 | but combine.c will eliminate it. */ | |
6f086dfc RS |
2338 | |
2339 | if (dest == var) | |
2340 | { | |
2341 | rtx temp; | |
00d8a4c1 RK |
2342 | rtx fixeddest = SET_DEST (x); |
2343 | ||
6f086dfc | 2344 | /* STRICT_LOW_PART can be discarded, around a MEM. */ |
00d8a4c1 RK |
2345 | if (GET_CODE (fixeddest) == STRICT_LOW_PART) |
2346 | fixeddest = XEXP (fixeddest, 0); | |
6f086dfc | 2347 | /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */ |
00d8a4c1 | 2348 | if (GET_CODE (fixeddest) == SUBREG) |
926d1ca5 RK |
2349 | { |
2350 | fixeddest = fixup_memory_subreg (fixeddest, insn, 0); | |
2351 | promoted_mode = GET_MODE (fixeddest); | |
2352 | } | |
6f086dfc | 2353 | else |
00d8a4c1 RK |
2354 | fixeddest = fixup_stack_1 (fixeddest, insn); |
2355 | ||
926d1ca5 | 2356 | temp = gen_reg_rtx (promoted_mode); |
00d8a4c1 RK |
2357 | |
2358 | emit_insn_after (gen_move_insn (fixeddest, | |
2359 | gen_lowpart (GET_MODE (fixeddest), | |
2360 | temp)), | |
2361 | insn); | |
6f086dfc | 2362 | |
6f086dfc RS |
2363 | SET_DEST (x) = temp; |
2364 | } | |
2365 | } | |
e9a25f70 JL |
2366 | |
2367 | default: | |
2368 | break; | |
6f086dfc RS |
2369 | } |
2370 | ||
2371 | /* Nothing special about this RTX; fix its operands. */ | |
2372 | ||
2373 | fmt = GET_RTX_FORMAT (code); | |
2374 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2375 | { | |
2376 | if (fmt[i] == 'e') | |
00d8a4c1 | 2377 | fixup_var_refs_1 (var, promoted_mode, &XEXP (x, i), insn, replacements); |
6f086dfc RS |
2378 | if (fmt[i] == 'E') |
2379 | { | |
2380 | register int j; | |
2381 | for (j = 0; j < XVECLEN (x, i); j++) | |
00d8a4c1 RK |
2382 | fixup_var_refs_1 (var, promoted_mode, &XVECEXP (x, i, j), |
2383 | insn, replacements); | |
6f086dfc RS |
2384 | } |
2385 | } | |
2386 | } | |
2387 | \f | |
2388 | /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)), | |
2389 | return an rtx (MEM:m1 newaddr) which is equivalent. | |
2390 | If any insns must be emitted to compute NEWADDR, put them before INSN. | |
2391 | ||
2392 | UNCRITICAL nonzero means accept paradoxical subregs. | |
0f41302f | 2393 | This is used for subregs found inside REG_NOTES. */ |
6f086dfc RS |
2394 | |
2395 | static rtx | |
2396 | fixup_memory_subreg (x, insn, uncritical) | |
2397 | rtx x; | |
2398 | rtx insn; | |
2399 | int uncritical; | |
2400 | { | |
2401 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
2402 | rtx addr = XEXP (SUBREG_REG (x), 0); | |
2403 | enum machine_mode mode = GET_MODE (x); | |
29a82058 | 2404 | rtx result; |
6f086dfc RS |
2405 | |
2406 | /* Paradoxical SUBREGs are usually invalid during RTL generation. */ | |
2407 | if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) | |
2408 | && ! uncritical) | |
2409 | abort (); | |
2410 | ||
f76b9db2 ILT |
2411 | if (BYTES_BIG_ENDIAN) |
2412 | offset += (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
2413 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
6f086dfc RS |
2414 | addr = plus_constant (addr, offset); |
2415 | if (!flag_force_addr && memory_address_p (mode, addr)) | |
2416 | /* Shortcut if no insns need be emitted. */ | |
2417 | return change_address (SUBREG_REG (x), mode, addr); | |
2418 | start_sequence (); | |
2419 | result = change_address (SUBREG_REG (x), mode, addr); | |
2420 | emit_insn_before (gen_sequence (), insn); | |
2421 | end_sequence (); | |
2422 | return result; | |
2423 | } | |
2424 | ||
2425 | /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X. | |
2426 | Replace subexpressions of X in place. | |
2427 | If X itself is a (SUBREG (MEM ...) ...), return the replacement expression. | |
2428 | Otherwise return X, with its contents possibly altered. | |
2429 | ||
ab6155b7 RK |
2430 | If any insns must be emitted to compute NEWADDR, put them before INSN. |
2431 | ||
2432 | UNCRITICAL is as in fixup_memory_subreg. */ | |
6f086dfc RS |
2433 | |
2434 | static rtx | |
ab6155b7 | 2435 | walk_fixup_memory_subreg (x, insn, uncritical) |
6f086dfc RS |
2436 | register rtx x; |
2437 | rtx insn; | |
ab6155b7 | 2438 | int uncritical; |
6f086dfc RS |
2439 | { |
2440 | register enum rtx_code code; | |
2441 | register char *fmt; | |
2442 | register int i; | |
2443 | ||
2444 | if (x == 0) | |
2445 | return 0; | |
2446 | ||
2447 | code = GET_CODE (x); | |
2448 | ||
2449 | if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == MEM) | |
ab6155b7 | 2450 | return fixup_memory_subreg (x, insn, uncritical); |
6f086dfc RS |
2451 | |
2452 | /* Nothing special about this RTX; fix its operands. */ | |
2453 | ||
2454 | fmt = GET_RTX_FORMAT (code); | |
2455 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2456 | { | |
2457 | if (fmt[i] == 'e') | |
ab6155b7 | 2458 | XEXP (x, i) = walk_fixup_memory_subreg (XEXP (x, i), insn, uncritical); |
6f086dfc RS |
2459 | if (fmt[i] == 'E') |
2460 | { | |
2461 | register int j; | |
2462 | for (j = 0; j < XVECLEN (x, i); j++) | |
2463 | XVECEXP (x, i, j) | |
ab6155b7 | 2464 | = walk_fixup_memory_subreg (XVECEXP (x, i, j), insn, uncritical); |
6f086dfc RS |
2465 | } |
2466 | } | |
2467 | return x; | |
2468 | } | |
2469 | \f | |
6f086dfc RS |
2470 | /* For each memory ref within X, if it refers to a stack slot |
2471 | with an out of range displacement, put the address in a temp register | |
2472 | (emitting new insns before INSN to load these registers) | |
2473 | and alter the memory ref to use that register. | |
2474 | Replace each such MEM rtx with a copy, to avoid clobberage. */ | |
2475 | ||
2476 | static rtx | |
2477 | fixup_stack_1 (x, insn) | |
2478 | rtx x; | |
2479 | rtx insn; | |
2480 | { | |
2481 | register int i; | |
2482 | register RTX_CODE code = GET_CODE (x); | |
2483 | register char *fmt; | |
2484 | ||
2485 | if (code == MEM) | |
2486 | { | |
2487 | register rtx ad = XEXP (x, 0); | |
2488 | /* If we have address of a stack slot but it's not valid | |
2489 | (displacement is too large), compute the sum in a register. */ | |
2490 | if (GET_CODE (ad) == PLUS | |
2491 | && GET_CODE (XEXP (ad, 0)) == REG | |
40d05551 RK |
2492 | && ((REGNO (XEXP (ad, 0)) >= FIRST_VIRTUAL_REGISTER |
2493 | && REGNO (XEXP (ad, 0)) <= LAST_VIRTUAL_REGISTER) | |
e9a25f70 JL |
2494 | || REGNO (XEXP (ad, 0)) == FRAME_POINTER_REGNUM |
2495 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
2496 | || REGNO (XEXP (ad, 0)) == HARD_FRAME_POINTER_REGNUM | |
2497 | #endif | |
2498 | || REGNO (XEXP (ad, 0)) == STACK_POINTER_REGNUM | |
956d6950 | 2499 | || REGNO (XEXP (ad, 0)) == ARG_POINTER_REGNUM |
40d05551 | 2500 | || XEXP (ad, 0) == current_function_internal_arg_pointer) |
6f086dfc RS |
2501 | && GET_CODE (XEXP (ad, 1)) == CONST_INT) |
2502 | { | |
2503 | rtx temp, seq; | |
2504 | if (memory_address_p (GET_MODE (x), ad)) | |
2505 | return x; | |
2506 | ||
2507 | start_sequence (); | |
2508 | temp = copy_to_reg (ad); | |
2509 | seq = gen_sequence (); | |
2510 | end_sequence (); | |
2511 | emit_insn_before (seq, insn); | |
2512 | return change_address (x, VOIDmode, temp); | |
2513 | } | |
2514 | return x; | |
2515 | } | |
2516 | ||
2517 | fmt = GET_RTX_FORMAT (code); | |
2518 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2519 | { | |
2520 | if (fmt[i] == 'e') | |
2521 | XEXP (x, i) = fixup_stack_1 (XEXP (x, i), insn); | |
2522 | if (fmt[i] == 'E') | |
2523 | { | |
2524 | register int j; | |
2525 | for (j = 0; j < XVECLEN (x, i); j++) | |
2526 | XVECEXP (x, i, j) = fixup_stack_1 (XVECEXP (x, i, j), insn); | |
2527 | } | |
2528 | } | |
2529 | return x; | |
2530 | } | |
2531 | \f | |
2532 | /* Optimization: a bit-field instruction whose field | |
2533 | happens to be a byte or halfword in memory | |
2534 | can be changed to a move instruction. | |
2535 | ||
2536 | We call here when INSN is an insn to examine or store into a bit-field. | |
2537 | BODY is the SET-rtx to be altered. | |
2538 | ||
2539 | EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0. | |
2540 | (Currently this is called only from function.c, and EQUIV_MEM | |
2541 | is always 0.) */ | |
2542 | ||
2543 | static void | |
2544 | optimize_bit_field (body, insn, equiv_mem) | |
2545 | rtx body; | |
2546 | rtx insn; | |
2547 | rtx *equiv_mem; | |
2548 | { | |
2549 | register rtx bitfield; | |
2550 | int destflag; | |
2551 | rtx seq = 0; | |
2552 | enum machine_mode mode; | |
2553 | ||
2554 | if (GET_CODE (SET_DEST (body)) == SIGN_EXTRACT | |
2555 | || GET_CODE (SET_DEST (body)) == ZERO_EXTRACT) | |
2556 | bitfield = SET_DEST (body), destflag = 1; | |
2557 | else | |
2558 | bitfield = SET_SRC (body), destflag = 0; | |
2559 | ||
2560 | /* First check that the field being stored has constant size and position | |
2561 | and is in fact a byte or halfword suitably aligned. */ | |
2562 | ||
2563 | if (GET_CODE (XEXP (bitfield, 1)) == CONST_INT | |
2564 | && GET_CODE (XEXP (bitfield, 2)) == CONST_INT | |
2565 | && ((mode = mode_for_size (INTVAL (XEXP (bitfield, 1)), MODE_INT, 1)) | |
2566 | != BLKmode) | |
2567 | && INTVAL (XEXP (bitfield, 2)) % INTVAL (XEXP (bitfield, 1)) == 0) | |
2568 | { | |
2569 | register rtx memref = 0; | |
2570 | ||
2571 | /* Now check that the containing word is memory, not a register, | |
2572 | and that it is safe to change the machine mode. */ | |
2573 | ||
2574 | if (GET_CODE (XEXP (bitfield, 0)) == MEM) | |
2575 | memref = XEXP (bitfield, 0); | |
2576 | else if (GET_CODE (XEXP (bitfield, 0)) == REG | |
2577 | && equiv_mem != 0) | |
2578 | memref = equiv_mem[REGNO (XEXP (bitfield, 0))]; | |
2579 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2580 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == MEM) | |
2581 | memref = SUBREG_REG (XEXP (bitfield, 0)); | |
2582 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2583 | && equiv_mem != 0 | |
2584 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == REG) | |
2585 | memref = equiv_mem[REGNO (SUBREG_REG (XEXP (bitfield, 0)))]; | |
2586 | ||
2587 | if (memref | |
2588 | && ! mode_dependent_address_p (XEXP (memref, 0)) | |
2589 | && ! MEM_VOLATILE_P (memref)) | |
2590 | { | |
2591 | /* Now adjust the address, first for any subreg'ing | |
2592 | that we are now getting rid of, | |
2593 | and then for which byte of the word is wanted. */ | |
2594 | ||
e5e809f4 | 2595 | HOST_WIDE_INT offset = INTVAL (XEXP (bitfield, 2)); |
b88a3142 RK |
2596 | rtx insns; |
2597 | ||
6f086dfc | 2598 | /* Adjust OFFSET to count bits from low-address byte. */ |
f76b9db2 ILT |
2599 | if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN) |
2600 | offset = (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield, 0))) | |
2601 | - offset - INTVAL (XEXP (bitfield, 1))); | |
2602 | ||
6f086dfc RS |
2603 | /* Adjust OFFSET to count bytes from low-address byte. */ |
2604 | offset /= BITS_PER_UNIT; | |
2605 | if (GET_CODE (XEXP (bitfield, 0)) == SUBREG) | |
2606 | { | |
2607 | offset += SUBREG_WORD (XEXP (bitfield, 0)) * UNITS_PER_WORD; | |
f76b9db2 ILT |
2608 | if (BYTES_BIG_ENDIAN) |
2609 | offset -= (MIN (UNITS_PER_WORD, | |
2610 | GET_MODE_SIZE (GET_MODE (XEXP (bitfield, 0)))) | |
2611 | - MIN (UNITS_PER_WORD, | |
2612 | GET_MODE_SIZE (GET_MODE (memref)))); | |
6f086dfc RS |
2613 | } |
2614 | ||
b88a3142 RK |
2615 | start_sequence (); |
2616 | memref = change_address (memref, mode, | |
6f086dfc | 2617 | plus_constant (XEXP (memref, 0), offset)); |
b88a3142 RK |
2618 | insns = get_insns (); |
2619 | end_sequence (); | |
2620 | emit_insns_before (insns, insn); | |
6f086dfc RS |
2621 | |
2622 | /* Store this memory reference where | |
2623 | we found the bit field reference. */ | |
2624 | ||
2625 | if (destflag) | |
2626 | { | |
2627 | validate_change (insn, &SET_DEST (body), memref, 1); | |
2628 | if (! CONSTANT_ADDRESS_P (SET_SRC (body))) | |
2629 | { | |
2630 | rtx src = SET_SRC (body); | |
2631 | while (GET_CODE (src) == SUBREG | |
2632 | && SUBREG_WORD (src) == 0) | |
2633 | src = SUBREG_REG (src); | |
2634 | if (GET_MODE (src) != GET_MODE (memref)) | |
2635 | src = gen_lowpart (GET_MODE (memref), SET_SRC (body)); | |
2636 | validate_change (insn, &SET_SRC (body), src, 1); | |
2637 | } | |
2638 | else if (GET_MODE (SET_SRC (body)) != VOIDmode | |
2639 | && GET_MODE (SET_SRC (body)) != GET_MODE (memref)) | |
2640 | /* This shouldn't happen because anything that didn't have | |
2641 | one of these modes should have got converted explicitly | |
2642 | and then referenced through a subreg. | |
2643 | This is so because the original bit-field was | |
2644 | handled by agg_mode and so its tree structure had | |
2645 | the same mode that memref now has. */ | |
2646 | abort (); | |
2647 | } | |
2648 | else | |
2649 | { | |
2650 | rtx dest = SET_DEST (body); | |
2651 | ||
2652 | while (GET_CODE (dest) == SUBREG | |
4013a709 RK |
2653 | && SUBREG_WORD (dest) == 0 |
2654 | && (GET_MODE_CLASS (GET_MODE (dest)) | |
2655 | == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest))))) | |
6f086dfc RS |
2656 | dest = SUBREG_REG (dest); |
2657 | ||
2658 | validate_change (insn, &SET_DEST (body), dest, 1); | |
2659 | ||
2660 | if (GET_MODE (dest) == GET_MODE (memref)) | |
2661 | validate_change (insn, &SET_SRC (body), memref, 1); | |
2662 | else | |
2663 | { | |
2664 | /* Convert the mem ref to the destination mode. */ | |
2665 | rtx newreg = gen_reg_rtx (GET_MODE (dest)); | |
2666 | ||
2667 | start_sequence (); | |
2668 | convert_move (newreg, memref, | |
2669 | GET_CODE (SET_SRC (body)) == ZERO_EXTRACT); | |
2670 | seq = get_insns (); | |
2671 | end_sequence (); | |
2672 | ||
2673 | validate_change (insn, &SET_SRC (body), newreg, 1); | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | /* See if we can convert this extraction or insertion into | |
2678 | a simple move insn. We might not be able to do so if this | |
2679 | was, for example, part of a PARALLEL. | |
2680 | ||
2681 | If we succeed, write out any needed conversions. If we fail, | |
2682 | it is hard to guess why we failed, so don't do anything | |
2683 | special; just let the optimization be suppressed. */ | |
2684 | ||
2685 | if (apply_change_group () && seq) | |
2686 | emit_insns_before (seq, insn); | |
2687 | } | |
2688 | } | |
2689 | } | |
2690 | \f | |
2691 | /* These routines are responsible for converting virtual register references | |
2692 | to the actual hard register references once RTL generation is complete. | |
2693 | ||
2694 | The following four variables are used for communication between the | |
2695 | routines. They contain the offsets of the virtual registers from their | |
2696 | respective hard registers. */ | |
2697 | ||
2698 | static int in_arg_offset; | |
2699 | static int var_offset; | |
2700 | static int dynamic_offset; | |
2701 | static int out_arg_offset; | |
71038426 | 2702 | static int cfa_offset; |
6f086dfc RS |
2703 | |
2704 | /* In most machines, the stack pointer register is equivalent to the bottom | |
2705 | of the stack. */ | |
2706 | ||
2707 | #ifndef STACK_POINTER_OFFSET | |
2708 | #define STACK_POINTER_OFFSET 0 | |
2709 | #endif | |
2710 | ||
2711 | /* If not defined, pick an appropriate default for the offset of dynamically | |
2712 | allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS, | |
2713 | REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */ | |
2714 | ||
2715 | #ifndef STACK_DYNAMIC_OFFSET | |
2716 | ||
2717 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2718 | /* The bottom of the stack points to the actual arguments. If | |
2719 | REG_PARM_STACK_SPACE is defined, this includes the space for the register | |
2720 | parameters. However, if OUTGOING_REG_PARM_STACK space is not defined, | |
2721 | stack space for register parameters is not pushed by the caller, but | |
2722 | rather part of the fixed stack areas and hence not included in | |
2723 | `current_function_outgoing_args_size'. Nevertheless, we must allow | |
2724 | for it when allocating stack dynamic objects. */ | |
2725 | ||
2726 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
2727 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2728 | (current_function_outgoing_args_size \ | |
2729 | + REG_PARM_STACK_SPACE (FNDECL) + (STACK_POINTER_OFFSET)) | |
2730 | ||
2731 | #else | |
2732 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
2733 | (current_function_outgoing_args_size + (STACK_POINTER_OFFSET)) | |
2734 | #endif | |
2735 | ||
2736 | #else | |
2737 | #define STACK_DYNAMIC_OFFSET(FNDECL) STACK_POINTER_OFFSET | |
2738 | #endif | |
2739 | #endif | |
2740 | ||
71038426 RH |
2741 | /* On a few machines, the CFA coincides with the arg pointer. */ |
2742 | ||
2743 | #ifndef ARG_POINTER_CFA_OFFSET | |
2744 | #define ARG_POINTER_CFA_OFFSET 0 | |
2745 | #endif | |
2746 | ||
2747 | ||
e9a25f70 JL |
2748 | /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had |
2749 | its address taken. DECL is the decl for the object stored in the | |
2750 | register, for later use if we do need to force REG into the stack. | |
2751 | REG is overwritten by the MEM like in put_reg_into_stack. */ | |
2752 | ||
2753 | rtx | |
2754 | gen_mem_addressof (reg, decl) | |
2755 | rtx reg; | |
2756 | tree decl; | |
2757 | { | |
2758 | tree type = TREE_TYPE (decl); | |
2759 | ||
38a448ca | 2760 | rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)), REGNO (reg)); |
e9a25f70 JL |
2761 | SET_ADDRESSOF_DECL (r, decl); |
2762 | ||
2763 | XEXP (reg, 0) = r; | |
2764 | PUT_CODE (reg, MEM); | |
2765 | PUT_MODE (reg, DECL_MODE (decl)); | |
2766 | MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl); | |
2767 | MEM_IN_STRUCT_P (reg) = AGGREGATE_TYPE_P (type); | |
41472af8 | 2768 | MEM_ALIAS_SET (reg) = get_alias_set (decl); |
e9a25f70 | 2769 | |
e5e809f4 JL |
2770 | if (TREE_USED (decl) || DECL_INITIAL (decl) != 0) |
2771 | fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type)); | |
2772 | ||
e9a25f70 JL |
2773 | return reg; |
2774 | } | |
2775 | ||
2776 | /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */ | |
2777 | ||
2778 | void | |
2779 | flush_addressof (decl) | |
2780 | tree decl; | |
2781 | { | |
2782 | if ((TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == VAR_DECL) | |
2783 | && DECL_RTL (decl) != 0 | |
2784 | && GET_CODE (DECL_RTL (decl)) == MEM | |
2785 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF | |
2786 | && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == REG) | |
2787 | put_addressof_into_stack (XEXP (DECL_RTL (decl), 0)); | |
2788 | } | |
2789 | ||
2790 | /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */ | |
2791 | ||
2792 | static void | |
2793 | put_addressof_into_stack (r) | |
2794 | rtx r; | |
2795 | { | |
2796 | tree decl = ADDRESSOF_DECL (r); | |
2797 | rtx reg = XEXP (r, 0); | |
2798 | ||
2799 | if (GET_CODE (reg) != REG) | |
2800 | abort (); | |
2801 | ||
2802 | put_reg_into_stack (0, reg, TREE_TYPE (decl), GET_MODE (reg), | |
2803 | DECL_MODE (decl), TREE_SIDE_EFFECTS (decl), | |
e5e809f4 JL |
2804 | ADDRESSOF_REGNO (r), |
2805 | TREE_USED (decl) || DECL_INITIAL (decl) != 0); | |
e9a25f70 JL |
2806 | } |
2807 | ||
2808 | /* Helper function for purge_addressof. See if the rtx expression at *LOC | |
2809 | in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into | |
2810 | the stack. */ | |
2811 | ||
2812 | static void | |
2813 | purge_addressof_1 (loc, insn, force) | |
2814 | rtx *loc; | |
2815 | rtx insn; | |
2816 | int force; | |
2817 | { | |
2818 | rtx x; | |
2819 | RTX_CODE code; | |
2820 | int i, j; | |
2821 | char *fmt; | |
2822 | ||
2823 | /* Re-start here to avoid recursion in common cases. */ | |
2824 | restart: | |
2825 | ||
2826 | x = *loc; | |
2827 | if (x == 0) | |
2828 | return; | |
2829 | ||
2830 | code = GET_CODE (x); | |
2831 | ||
2832 | if (code == ADDRESSOF && GET_CODE (XEXP (x, 0)) == MEM) | |
2833 | { | |
2834 | rtx insns; | |
956d6950 JL |
2835 | /* We must create a copy of the rtx because it was created by |
2836 | overwriting a REG rtx which is always shared. */ | |
2837 | rtx sub = copy_rtx (XEXP (XEXP (x, 0), 0)); | |
e9a25f70 | 2838 | |
956d6950 | 2839 | if (validate_change (insn, loc, sub, 0)) |
e9a25f70 JL |
2840 | return; |
2841 | ||
2842 | start_sequence (); | |
2843 | if (! validate_change (insn, loc, | |
956d6950 | 2844 | force_operand (sub, NULL_RTX), |
e9a25f70 JL |
2845 | 0)) |
2846 | abort (); | |
2847 | ||
2848 | insns = get_insns (); | |
2849 | end_sequence (); | |
2850 | emit_insns_before (insns, insn); | |
2851 | return; | |
2852 | } | |
2853 | else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force) | |
2854 | { | |
2855 | rtx sub = XEXP (XEXP (x, 0), 0); | |
e5e809f4 | 2856 | |
6d8ccdbb | 2857 | if (GET_CODE (sub) == MEM) |
38a448ca | 2858 | sub = gen_rtx_MEM (GET_MODE (x), copy_rtx (XEXP (sub, 0))); |
e5e809f4 | 2859 | |
f5963e61 JL |
2860 | if (GET_CODE (sub) == REG |
2861 | && (MEM_VOLATILE_P (x) || GET_MODE (x) == BLKmode)) | |
e5e809f4 JL |
2862 | { |
2863 | put_addressof_into_stack (XEXP (x, 0)); | |
2864 | return; | |
2865 | } | |
2866 | else if (GET_CODE (sub) == REG && GET_MODE (x) != GET_MODE (sub)) | |
e9a25f70 JL |
2867 | { |
2868 | if (! BYTES_BIG_ENDIAN && ! WORDS_BIG_ENDIAN) | |
2869 | { | |
38a448ca | 2870 | rtx sub2 = gen_rtx_SUBREG (GET_MODE (x), sub, 0); |
e9a25f70 JL |
2871 | if (validate_change (insn, loc, sub2, 0)) |
2872 | goto restart; | |
2873 | } | |
2874 | } | |
2875 | else if (validate_change (insn, loc, sub, 0)) | |
2876 | goto restart; | |
2877 | /* else give up and put it into the stack */ | |
2878 | } | |
2879 | else if (code == ADDRESSOF) | |
2880 | { | |
2881 | put_addressof_into_stack (x); | |
2882 | return; | |
2883 | } | |
2884 | ||
2885 | /* Scan all subexpressions. */ | |
2886 | fmt = GET_RTX_FORMAT (code); | |
2887 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
2888 | { | |
2889 | if (*fmt == 'e') | |
2890 | purge_addressof_1 (&XEXP (x, i), insn, force); | |
2891 | else if (*fmt == 'E') | |
2892 | for (j = 0; j < XVECLEN (x, i); j++) | |
2893 | purge_addressof_1 (&XVECEXP (x, i, j), insn, force); | |
2894 | } | |
2895 | } | |
2896 | ||
2897 | /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining | |
2898 | (MEM (ADDRESSOF)) patterns, and force any needed registers into the | |
2899 | stack. */ | |
2900 | ||
2901 | void | |
2902 | purge_addressof (insns) | |
2903 | rtx insns; | |
2904 | { | |
2905 | rtx insn; | |
2906 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
2907 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
2908 | || GET_CODE (insn) == CALL_INSN) | |
2909 | { | |
2910 | purge_addressof_1 (&PATTERN (insn), insn, | |
2911 | asm_noperands (PATTERN (insn)) > 0); | |
2912 | purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0); | |
2913 | } | |
2914 | } | |
2915 | \f | |
6f086dfc RS |
2916 | /* Pass through the INSNS of function FNDECL and convert virtual register |
2917 | references to hard register references. */ | |
2918 | ||
2919 | void | |
2920 | instantiate_virtual_regs (fndecl, insns) | |
2921 | tree fndecl; | |
2922 | rtx insns; | |
2923 | { | |
2924 | rtx insn; | |
e9a25f70 | 2925 | int i; |
6f086dfc RS |
2926 | |
2927 | /* Compute the offsets to use for this function. */ | |
2928 | in_arg_offset = FIRST_PARM_OFFSET (fndecl); | |
2929 | var_offset = STARTING_FRAME_OFFSET; | |
2930 | dynamic_offset = STACK_DYNAMIC_OFFSET (fndecl); | |
2931 | out_arg_offset = STACK_POINTER_OFFSET; | |
71038426 | 2932 | cfa_offset = ARG_POINTER_CFA_OFFSET; |
6f086dfc RS |
2933 | |
2934 | /* Scan all variables and parameters of this function. For each that is | |
2935 | in memory, instantiate all virtual registers if the result is a valid | |
2936 | address. If not, we do it later. That will handle most uses of virtual | |
2937 | regs on many machines. */ | |
2938 | instantiate_decls (fndecl, 1); | |
2939 | ||
2940 | /* Initialize recognition, indicating that volatile is OK. */ | |
2941 | init_recog (); | |
2942 | ||
2943 | /* Scan through all the insns, instantiating every virtual register still | |
2944 | present. */ | |
2945 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
2946 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
2947 | || GET_CODE (insn) == CALL_INSN) | |
2948 | { | |
2949 | instantiate_virtual_regs_1 (&PATTERN (insn), insn, 1); | |
5f4f0e22 | 2950 | instantiate_virtual_regs_1 (®_NOTES (insn), NULL_RTX, 0); |
6f086dfc RS |
2951 | } |
2952 | ||
e9a25f70 JL |
2953 | /* Instantiate the stack slots for the parm registers, for later use in |
2954 | addressof elimination. */ | |
2955 | for (i = 0; i < max_parm_reg; ++i) | |
2956 | if (parm_reg_stack_loc[i]) | |
2957 | instantiate_virtual_regs_1 (&parm_reg_stack_loc[i], NULL_RTX, 0); | |
2958 | ||
6f086dfc RS |
2959 | /* Now instantiate the remaining register equivalences for debugging info. |
2960 | These will not be valid addresses. */ | |
2961 | instantiate_decls (fndecl, 0); | |
2962 | ||
2963 | /* Indicate that, from now on, assign_stack_local should use | |
2964 | frame_pointer_rtx. */ | |
2965 | virtuals_instantiated = 1; | |
2966 | } | |
2967 | ||
2968 | /* Scan all decls in FNDECL (both variables and parameters) and instantiate | |
2969 | all virtual registers in their DECL_RTL's. | |
2970 | ||
2971 | If VALID_ONLY, do this only if the resulting address is still valid. | |
2972 | Otherwise, always do it. */ | |
2973 | ||
2974 | static void | |
2975 | instantiate_decls (fndecl, valid_only) | |
2976 | tree fndecl; | |
2977 | int valid_only; | |
2978 | { | |
2979 | tree decl; | |
2980 | ||
e1686233 | 2981 | if (DECL_SAVED_INSNS (fndecl)) |
6f086dfc RS |
2982 | /* When compiling an inline function, the obstack used for |
2983 | rtl allocation is the maybepermanent_obstack. Calling | |
2984 | `resume_temporary_allocation' switches us back to that | |
2985 | obstack while we process this function's parameters. */ | |
2986 | resume_temporary_allocation (); | |
2987 | ||
2988 | /* Process all parameters of the function. */ | |
2989 | for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl)) | |
2990 | { | |
e5e809f4 JL |
2991 | HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (decl)); |
2992 | ||
ce717ce4 JW |
2993 | instantiate_decl (DECL_RTL (decl), size, valid_only); |
2994 | ||
2995 | /* If the parameter was promoted, then the incoming RTL mode may be | |
2996 | larger than the declared type size. We must use the larger of | |
2997 | the two sizes. */ | |
2998 | size = MAX (GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl))), size); | |
2999 | instantiate_decl (DECL_INCOMING_RTL (decl), size, valid_only); | |
6f086dfc RS |
3000 | } |
3001 | ||
0f41302f | 3002 | /* Now process all variables defined in the function or its subblocks. */ |
6f086dfc RS |
3003 | instantiate_decls_1 (DECL_INITIAL (fndecl), valid_only); |
3004 | ||
79c0672e | 3005 | if (DECL_INLINE (fndecl) || DECL_DEFER_OUTPUT (fndecl)) |
6f086dfc RS |
3006 | { |
3007 | /* Save all rtl allocated for this function by raising the | |
3008 | high-water mark on the maybepermanent_obstack. */ | |
3009 | preserve_data (); | |
3010 | /* All further rtl allocation is now done in the current_obstack. */ | |
3011 | rtl_in_current_obstack (); | |
3012 | } | |
3013 | } | |
3014 | ||
3015 | /* Subroutine of instantiate_decls: Process all decls in the given | |
3016 | BLOCK node and all its subblocks. */ | |
3017 | ||
3018 | static void | |
3019 | instantiate_decls_1 (let, valid_only) | |
3020 | tree let; | |
3021 | int valid_only; | |
3022 | { | |
3023 | tree t; | |
3024 | ||
3025 | for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t)) | |
5a73491b RK |
3026 | instantiate_decl (DECL_RTL (t), int_size_in_bytes (TREE_TYPE (t)), |
3027 | valid_only); | |
6f086dfc RS |
3028 | |
3029 | /* Process all subblocks. */ | |
3030 | for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t)) | |
3031 | instantiate_decls_1 (t, valid_only); | |
3032 | } | |
5a73491b | 3033 | |
8008b228 | 3034 | /* Subroutine of the preceding procedures: Given RTL representing a |
5a73491b RK |
3035 | decl and the size of the object, do any instantiation required. |
3036 | ||
3037 | If VALID_ONLY is non-zero, it means that the RTL should only be | |
3038 | changed if the new address is valid. */ | |
3039 | ||
3040 | static void | |
3041 | instantiate_decl (x, size, valid_only) | |
3042 | rtx x; | |
3043 | int size; | |
3044 | int valid_only; | |
3045 | { | |
3046 | enum machine_mode mode; | |
3047 | rtx addr; | |
3048 | ||
3049 | /* If this is not a MEM, no need to do anything. Similarly if the | |
3050 | address is a constant or a register that is not a virtual register. */ | |
3051 | ||
3052 | if (x == 0 || GET_CODE (x) != MEM) | |
3053 | return; | |
3054 | ||
3055 | addr = XEXP (x, 0); | |
3056 | if (CONSTANT_P (addr) | |
956d6950 | 3057 | || (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == REG) |
5a73491b RK |
3058 | || (GET_CODE (addr) == REG |
3059 | && (REGNO (addr) < FIRST_VIRTUAL_REGISTER | |
3060 | || REGNO (addr) > LAST_VIRTUAL_REGISTER))) | |
3061 | return; | |
3062 | ||
3063 | /* If we should only do this if the address is valid, copy the address. | |
3064 | We need to do this so we can undo any changes that might make the | |
3065 | address invalid. This copy is unfortunate, but probably can't be | |
3066 | avoided. */ | |
3067 | ||
3068 | if (valid_only) | |
3069 | addr = copy_rtx (addr); | |
3070 | ||
3071 | instantiate_virtual_regs_1 (&addr, NULL_RTX, 0); | |
3072 | ||
87ce34d6 JW |
3073 | if (valid_only) |
3074 | { | |
3075 | /* Now verify that the resulting address is valid for every integer or | |
3076 | floating-point mode up to and including SIZE bytes long. We do this | |
3077 | since the object might be accessed in any mode and frame addresses | |
3078 | are shared. */ | |
3079 | ||
3080 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
3081 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3082 | mode = GET_MODE_WIDER_MODE (mode)) | |
3083 | if (! memory_address_p (mode, addr)) | |
3084 | return; | |
5a73491b | 3085 | |
87ce34d6 JW |
3086 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); |
3087 | mode != VOIDmode && GET_MODE_SIZE (mode) <= size; | |
3088 | mode = GET_MODE_WIDER_MODE (mode)) | |
3089 | if (! memory_address_p (mode, addr)) | |
3090 | return; | |
3091 | } | |
5a73491b | 3092 | |
87ce34d6 JW |
3093 | /* Put back the address now that we have updated it and we either know |
3094 | it is valid or we don't care whether it is valid. */ | |
5a73491b RK |
3095 | |
3096 | XEXP (x, 0) = addr; | |
3097 | } | |
6f086dfc RS |
3098 | \f |
3099 | /* Given a pointer to a piece of rtx and an optional pointer to the | |
3100 | containing object, instantiate any virtual registers present in it. | |
3101 | ||
3102 | If EXTRA_INSNS, we always do the replacement and generate | |
3103 | any extra insns before OBJECT. If it zero, we do nothing if replacement | |
3104 | is not valid. | |
3105 | ||
3106 | Return 1 if we either had nothing to do or if we were able to do the | |
3107 | needed replacement. Return 0 otherwise; we only return zero if | |
3108 | EXTRA_INSNS is zero. | |
3109 | ||
3110 | We first try some simple transformations to avoid the creation of extra | |
3111 | pseudos. */ | |
3112 | ||
3113 | static int | |
3114 | instantiate_virtual_regs_1 (loc, object, extra_insns) | |
3115 | rtx *loc; | |
3116 | rtx object; | |
3117 | int extra_insns; | |
3118 | { | |
3119 | rtx x; | |
3120 | RTX_CODE code; | |
3121 | rtx new = 0; | |
e5e809f4 | 3122 | HOST_WIDE_INT offset; |
6f086dfc RS |
3123 | rtx temp; |
3124 | rtx seq; | |
3125 | int i, j; | |
3126 | char *fmt; | |
3127 | ||
3128 | /* Re-start here to avoid recursion in common cases. */ | |
3129 | restart: | |
3130 | ||
3131 | x = *loc; | |
3132 | if (x == 0) | |
3133 | return 1; | |
3134 | ||
3135 | code = GET_CODE (x); | |
3136 | ||
3137 | /* Check for some special cases. */ | |
3138 | switch (code) | |
3139 | { | |
3140 | case CONST_INT: | |
3141 | case CONST_DOUBLE: | |
3142 | case CONST: | |
3143 | case SYMBOL_REF: | |
3144 | case CODE_LABEL: | |
3145 | case PC: | |
3146 | case CC0: | |
3147 | case ASM_INPUT: | |
3148 | case ADDR_VEC: | |
3149 | case ADDR_DIFF_VEC: | |
3150 | case RETURN: | |
3151 | return 1; | |
3152 | ||
3153 | case SET: | |
3154 | /* We are allowed to set the virtual registers. This means that | |
38e01259 | 3155 | the actual register should receive the source minus the |
6f086dfc RS |
3156 | appropriate offset. This is used, for example, in the handling |
3157 | of non-local gotos. */ | |
3158 | if (SET_DEST (x) == virtual_incoming_args_rtx) | |
3159 | new = arg_pointer_rtx, offset = - in_arg_offset; | |
3160 | else if (SET_DEST (x) == virtual_stack_vars_rtx) | |
dfd3dae6 | 3161 | new = frame_pointer_rtx, offset = - var_offset; |
6f086dfc RS |
3162 | else if (SET_DEST (x) == virtual_stack_dynamic_rtx) |
3163 | new = stack_pointer_rtx, offset = - dynamic_offset; | |
3164 | else if (SET_DEST (x) == virtual_outgoing_args_rtx) | |
3165 | new = stack_pointer_rtx, offset = - out_arg_offset; | |
71038426 RH |
3166 | else if (SET_DEST (x) == virtual_cfa_rtx) |
3167 | new = arg_pointer_rtx, offset = - cfa_offset; | |
6f086dfc RS |
3168 | |
3169 | if (new) | |
3170 | { | |
3171 | /* The only valid sources here are PLUS or REG. Just do | |
3172 | the simplest possible thing to handle them. */ | |
3173 | if (GET_CODE (SET_SRC (x)) != REG | |
3174 | && GET_CODE (SET_SRC (x)) != PLUS) | |
3175 | abort (); | |
3176 | ||
3177 | start_sequence (); | |
3178 | if (GET_CODE (SET_SRC (x)) != REG) | |
5f4f0e22 | 3179 | temp = force_operand (SET_SRC (x), NULL_RTX); |
6f086dfc RS |
3180 | else |
3181 | temp = SET_SRC (x); | |
5f4f0e22 | 3182 | temp = force_operand (plus_constant (temp, offset), NULL_RTX); |
6f086dfc RS |
3183 | seq = get_insns (); |
3184 | end_sequence (); | |
3185 | ||
3186 | emit_insns_before (seq, object); | |
3187 | SET_DEST (x) = new; | |
3188 | ||
e9a25f70 | 3189 | if (! validate_change (object, &SET_SRC (x), temp, 0) |
6f086dfc RS |
3190 | || ! extra_insns) |
3191 | abort (); | |
3192 | ||
3193 | return 1; | |
3194 | } | |
3195 | ||
3196 | instantiate_virtual_regs_1 (&SET_DEST (x), object, extra_insns); | |
3197 | loc = &SET_SRC (x); | |
3198 | goto restart; | |
3199 | ||
3200 | case PLUS: | |
3201 | /* Handle special case of virtual register plus constant. */ | |
3202 | if (CONSTANT_P (XEXP (x, 1))) | |
3203 | { | |
b1f82ccf | 3204 | rtx old, new_offset; |
6f086dfc RS |
3205 | |
3206 | /* Check for (plus (plus VIRT foo) (const_int)) first. */ | |
3207 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
3208 | { | |
3209 | rtx inner = XEXP (XEXP (x, 0), 0); | |
3210 | ||
3211 | if (inner == virtual_incoming_args_rtx) | |
3212 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3213 | else if (inner == virtual_stack_vars_rtx) | |
3214 | new = frame_pointer_rtx, offset = var_offset; | |
3215 | else if (inner == virtual_stack_dynamic_rtx) | |
3216 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3217 | else if (inner == virtual_outgoing_args_rtx) | |
3218 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3219 | else if (inner == virtual_cfa_rtx) |
3220 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3221 | else |
3222 | { | |
3223 | loc = &XEXP (x, 0); | |
3224 | goto restart; | |
3225 | } | |
3226 | ||
3227 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 1), object, | |
3228 | extra_insns); | |
38a448ca | 3229 | new = gen_rtx_PLUS (Pmode, new, XEXP (XEXP (x, 0), 1)); |
6f086dfc RS |
3230 | } |
3231 | ||
3232 | else if (XEXP (x, 0) == virtual_incoming_args_rtx) | |
3233 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3234 | else if (XEXP (x, 0) == virtual_stack_vars_rtx) | |
3235 | new = frame_pointer_rtx, offset = var_offset; | |
3236 | else if (XEXP (x, 0) == virtual_stack_dynamic_rtx) | |
3237 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3238 | else if (XEXP (x, 0) == virtual_outgoing_args_rtx) | |
3239 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3240 | else if (XEXP (x, 0) == virtual_cfa_rtx) |
3241 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3242 | else |
3243 | { | |
3244 | /* We know the second operand is a constant. Unless the | |
3245 | first operand is a REG (which has been already checked), | |
3246 | it needs to be checked. */ | |
3247 | if (GET_CODE (XEXP (x, 0)) != REG) | |
3248 | { | |
3249 | loc = &XEXP (x, 0); | |
3250 | goto restart; | |
3251 | } | |
3252 | return 1; | |
3253 | } | |
3254 | ||
b1f82ccf | 3255 | new_offset = plus_constant (XEXP (x, 1), offset); |
6f086dfc | 3256 | |
b1f82ccf DE |
3257 | /* If the new constant is zero, try to replace the sum with just |
3258 | the register. */ | |
3259 | if (new_offset == const0_rtx | |
3260 | && validate_change (object, loc, new, 0)) | |
6f086dfc RS |
3261 | return 1; |
3262 | ||
b1f82ccf DE |
3263 | /* Next try to replace the register and new offset. |
3264 | There are two changes to validate here and we can't assume that | |
3265 | in the case of old offset equals new just changing the register | |
3266 | will yield a valid insn. In the interests of a little efficiency, | |
3267 | however, we only call validate change once (we don't queue up the | |
0f41302f | 3268 | changes and then call apply_change_group). */ |
b1f82ccf DE |
3269 | |
3270 | old = XEXP (x, 0); | |
3271 | if (offset == 0 | |
3272 | ? ! validate_change (object, &XEXP (x, 0), new, 0) | |
3273 | : (XEXP (x, 0) = new, | |
3274 | ! validate_change (object, &XEXP (x, 1), new_offset, 0))) | |
6f086dfc RS |
3275 | { |
3276 | if (! extra_insns) | |
3277 | { | |
3278 | XEXP (x, 0) = old; | |
3279 | return 0; | |
3280 | } | |
3281 | ||
3282 | /* Otherwise copy the new constant into a register and replace | |
3283 | constant with that register. */ | |
3284 | temp = gen_reg_rtx (Pmode); | |
b1f82ccf | 3285 | XEXP (x, 0) = new; |
6f086dfc | 3286 | if (validate_change (object, &XEXP (x, 1), temp, 0)) |
b1f82ccf | 3287 | emit_insn_before (gen_move_insn (temp, new_offset), object); |
6f086dfc RS |
3288 | else |
3289 | { | |
3290 | /* If that didn't work, replace this expression with a | |
3291 | register containing the sum. */ | |
3292 | ||
6f086dfc | 3293 | XEXP (x, 0) = old; |
38a448ca | 3294 | new = gen_rtx_PLUS (Pmode, new, new_offset); |
6f086dfc RS |
3295 | |
3296 | start_sequence (); | |
5f4f0e22 | 3297 | temp = force_operand (new, NULL_RTX); |
6f086dfc RS |
3298 | seq = get_insns (); |
3299 | end_sequence (); | |
3300 | ||
3301 | emit_insns_before (seq, object); | |
3302 | if (! validate_change (object, loc, temp, 0) | |
3303 | && ! validate_replace_rtx (x, temp, object)) | |
3304 | abort (); | |
3305 | } | |
3306 | } | |
3307 | ||
3308 | return 1; | |
3309 | } | |
3310 | ||
3311 | /* Fall through to generic two-operand expression case. */ | |
3312 | case EXPR_LIST: | |
3313 | case CALL: | |
3314 | case COMPARE: | |
3315 | case MINUS: | |
3316 | case MULT: | |
3317 | case DIV: case UDIV: | |
3318 | case MOD: case UMOD: | |
3319 | case AND: case IOR: case XOR: | |
45620ed4 RK |
3320 | case ROTATERT: case ROTATE: |
3321 | case ASHIFTRT: case LSHIFTRT: case ASHIFT: | |
6f086dfc RS |
3322 | case NE: case EQ: |
3323 | case GE: case GT: case GEU: case GTU: | |
3324 | case LE: case LT: case LEU: case LTU: | |
3325 | if (XEXP (x, 1) && ! CONSTANT_P (XEXP (x, 1))) | |
3326 | instantiate_virtual_regs_1 (&XEXP (x, 1), object, extra_insns); | |
3327 | loc = &XEXP (x, 0); | |
3328 | goto restart; | |
3329 | ||
3330 | case MEM: | |
3331 | /* Most cases of MEM that convert to valid addresses have already been | |
4fd796bb | 3332 | handled by our scan of decls. The only special handling we |
6f086dfc | 3333 | need here is to make a copy of the rtx to ensure it isn't being |
b335c2cc | 3334 | shared if we have to change it to a pseudo. |
6f086dfc RS |
3335 | |
3336 | If the rtx is a simple reference to an address via a virtual register, | |
3337 | it can potentially be shared. In such cases, first try to make it | |
3338 | a valid address, which can also be shared. Otherwise, copy it and | |
3339 | proceed normally. | |
3340 | ||
3341 | First check for common cases that need no processing. These are | |
3342 | usually due to instantiation already being done on a previous instance | |
3343 | of a shared rtx. */ | |
3344 | ||
3345 | temp = XEXP (x, 0); | |
3346 | if (CONSTANT_ADDRESS_P (temp) | |
3347 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM | |
3348 | || temp == arg_pointer_rtx | |
b37f453b DE |
3349 | #endif |
3350 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3351 | || temp == hard_frame_pointer_rtx | |
6f086dfc RS |
3352 | #endif |
3353 | || temp == frame_pointer_rtx) | |
3354 | return 1; | |
3355 | ||
3356 | if (GET_CODE (temp) == PLUS | |
3357 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3358 | && (XEXP (temp, 0) == frame_pointer_rtx | |
b37f453b DE |
3359 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM |
3360 | || XEXP (temp, 0) == hard_frame_pointer_rtx | |
3361 | #endif | |
6f086dfc RS |
3362 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
3363 | || XEXP (temp, 0) == arg_pointer_rtx | |
3364 | #endif | |
3365 | )) | |
3366 | return 1; | |
3367 | ||
3368 | if (temp == virtual_stack_vars_rtx | |
3369 | || temp == virtual_incoming_args_rtx | |
3370 | || (GET_CODE (temp) == PLUS | |
3371 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3372 | && (XEXP (temp, 0) == virtual_stack_vars_rtx | |
3373 | || XEXP (temp, 0) == virtual_incoming_args_rtx))) | |
3374 | { | |
3375 | /* This MEM may be shared. If the substitution can be done without | |
3376 | the need to generate new pseudos, we want to do it in place | |
3377 | so all copies of the shared rtx benefit. The call below will | |
3378 | only make substitutions if the resulting address is still | |
3379 | valid. | |
3380 | ||
3381 | Note that we cannot pass X as the object in the recursive call | |
3382 | since the insn being processed may not allow all valid | |
6461be14 RS |
3383 | addresses. However, if we were not passed on object, we can |
3384 | only modify X without copying it if X will have a valid | |
3385 | address. | |
6f086dfc | 3386 | |
6461be14 RS |
3387 | ??? Also note that this can still lose if OBJECT is an insn that |
3388 | has less restrictions on an address that some other insn. | |
3389 | In that case, we will modify the shared address. This case | |
4fd796bb RK |
3390 | doesn't seem very likely, though. One case where this could |
3391 | happen is in the case of a USE or CLOBBER reference, but we | |
3392 | take care of that below. */ | |
6461be14 RS |
3393 | |
3394 | if (instantiate_virtual_regs_1 (&XEXP (x, 0), | |
3395 | object ? object : x, 0)) | |
6f086dfc RS |
3396 | return 1; |
3397 | ||
3398 | /* Otherwise make a copy and process that copy. We copy the entire | |
3399 | RTL expression since it might be a PLUS which could also be | |
3400 | shared. */ | |
3401 | *loc = x = copy_rtx (x); | |
3402 | } | |
3403 | ||
3404 | /* Fall through to generic unary operation case. */ | |
6f086dfc RS |
3405 | case SUBREG: |
3406 | case STRICT_LOW_PART: | |
3407 | case NEG: case NOT: | |
3408 | case PRE_DEC: case PRE_INC: case POST_DEC: case POST_INC: | |
3409 | case SIGN_EXTEND: case ZERO_EXTEND: | |
3410 | case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE: | |
3411 | case FLOAT: case FIX: | |
3412 | case UNSIGNED_FIX: case UNSIGNED_FLOAT: | |
3413 | case ABS: | |
3414 | case SQRT: | |
3415 | case FFS: | |
3416 | /* These case either have just one operand or we know that we need not | |
3417 | check the rest of the operands. */ | |
3418 | loc = &XEXP (x, 0); | |
3419 | goto restart; | |
3420 | ||
4fd796bb RK |
3421 | case USE: |
3422 | case CLOBBER: | |
3423 | /* If the operand is a MEM, see if the change is a valid MEM. If not, | |
3424 | go ahead and make the invalid one, but do it to a copy. For a REG, | |
3425 | just make the recursive call, since there's no chance of a problem. */ | |
3426 | ||
3427 | if ((GET_CODE (XEXP (x, 0)) == MEM | |
3428 | && instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), XEXP (x, 0), | |
3429 | 0)) | |
3430 | || (GET_CODE (XEXP (x, 0)) == REG | |
7694ce35 | 3431 | && instantiate_virtual_regs_1 (&XEXP (x, 0), object, 0))) |
4fd796bb RK |
3432 | return 1; |
3433 | ||
3434 | XEXP (x, 0) = copy_rtx (XEXP (x, 0)); | |
3435 | loc = &XEXP (x, 0); | |
3436 | goto restart; | |
3437 | ||
6f086dfc RS |
3438 | case REG: |
3439 | /* Try to replace with a PLUS. If that doesn't work, compute the sum | |
3440 | in front of this insn and substitute the temporary. */ | |
3441 | if (x == virtual_incoming_args_rtx) | |
3442 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3443 | else if (x == virtual_stack_vars_rtx) | |
3444 | new = frame_pointer_rtx, offset = var_offset; | |
3445 | else if (x == virtual_stack_dynamic_rtx) | |
3446 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3447 | else if (x == virtual_outgoing_args_rtx) | |
3448 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 RH |
3449 | else if (x == virtual_cfa_rtx) |
3450 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3451 | |
3452 | if (new) | |
3453 | { | |
3454 | temp = plus_constant (new, offset); | |
3455 | if (!validate_change (object, loc, temp, 0)) | |
3456 | { | |
3457 | if (! extra_insns) | |
3458 | return 0; | |
3459 | ||
3460 | start_sequence (); | |
5f4f0e22 | 3461 | temp = force_operand (temp, NULL_RTX); |
6f086dfc RS |
3462 | seq = get_insns (); |
3463 | end_sequence (); | |
3464 | ||
3465 | emit_insns_before (seq, object); | |
3466 | if (! validate_change (object, loc, temp, 0) | |
3467 | && ! validate_replace_rtx (x, temp, object)) | |
3468 | abort (); | |
3469 | } | |
3470 | } | |
3471 | ||
3472 | return 1; | |
e9a25f70 JL |
3473 | |
3474 | case ADDRESSOF: | |
3475 | if (GET_CODE (XEXP (x, 0)) == REG) | |
3476 | return 1; | |
3477 | ||
3478 | else if (GET_CODE (XEXP (x, 0)) == MEM) | |
3479 | { | |
3480 | /* If we have a (addressof (mem ..)), do any instantiation inside | |
3481 | since we know we'll be making the inside valid when we finally | |
3482 | remove the ADDRESSOF. */ | |
3483 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), NULL_RTX, 0); | |
3484 | return 1; | |
3485 | } | |
3486 | break; | |
3487 | ||
3488 | default: | |
3489 | break; | |
6f086dfc RS |
3490 | } |
3491 | ||
3492 | /* Scan all subexpressions. */ | |
3493 | fmt = GET_RTX_FORMAT (code); | |
3494 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
3495 | if (*fmt == 'e') | |
3496 | { | |
3497 | if (!instantiate_virtual_regs_1 (&XEXP (x, i), object, extra_insns)) | |
3498 | return 0; | |
3499 | } | |
3500 | else if (*fmt == 'E') | |
3501 | for (j = 0; j < XVECLEN (x, i); j++) | |
3502 | if (! instantiate_virtual_regs_1 (&XVECEXP (x, i, j), object, | |
3503 | extra_insns)) | |
3504 | return 0; | |
3505 | ||
3506 | return 1; | |
3507 | } | |
3508 | \f | |
3509 | /* Optimization: assuming this function does not receive nonlocal gotos, | |
3510 | delete the handlers for such, as well as the insns to establish | |
3511 | and disestablish them. */ | |
3512 | ||
3513 | static void | |
3514 | delete_handlers () | |
3515 | { | |
3516 | rtx insn; | |
3517 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3518 | { | |
3519 | /* Delete the handler by turning off the flag that would | |
3520 | prevent jump_optimize from deleting it. | |
3521 | Also permit deletion of the nonlocal labels themselves | |
3522 | if nothing local refers to them. */ | |
3523 | if (GET_CODE (insn) == CODE_LABEL) | |
71cd4a8d JW |
3524 | { |
3525 | tree t, last_t; | |
3526 | ||
3527 | LABEL_PRESERVE_P (insn) = 0; | |
3528 | ||
3529 | /* Remove it from the nonlocal_label list, to avoid confusing | |
3530 | flow. */ | |
3531 | for (t = nonlocal_labels, last_t = 0; t; | |
3532 | last_t = t, t = TREE_CHAIN (t)) | |
3533 | if (DECL_RTL (TREE_VALUE (t)) == insn) | |
3534 | break; | |
3535 | if (t) | |
3536 | { | |
3537 | if (! last_t) | |
3538 | nonlocal_labels = TREE_CHAIN (nonlocal_labels); | |
3539 | else | |
3540 | TREE_CHAIN (last_t) = TREE_CHAIN (t); | |
3541 | } | |
3542 | } | |
6f086dfc | 3543 | if (GET_CODE (insn) == INSN |
59257ff7 RK |
3544 | && ((nonlocal_goto_handler_slot != 0 |
3545 | && reg_mentioned_p (nonlocal_goto_handler_slot, PATTERN (insn))) | |
3546 | || (nonlocal_goto_stack_level != 0 | |
3547 | && reg_mentioned_p (nonlocal_goto_stack_level, | |
3548 | PATTERN (insn))))) | |
6f086dfc RS |
3549 | delete_insn (insn); |
3550 | } | |
3551 | } | |
3552 | ||
3553 | /* Return a list (chain of EXPR_LIST nodes) for the nonlocal labels | |
3554 | of the current function. */ | |
3555 | ||
3556 | rtx | |
3557 | nonlocal_label_rtx_list () | |
3558 | { | |
3559 | tree t; | |
3560 | rtx x = 0; | |
3561 | ||
3562 | for (t = nonlocal_labels; t; t = TREE_CHAIN (t)) | |
38a448ca | 3563 | x = gen_rtx_EXPR_LIST (VOIDmode, label_rtx (TREE_VALUE (t)), x); |
6f086dfc RS |
3564 | |
3565 | return x; | |
3566 | } | |
3567 | \f | |
3568 | /* Output a USE for any register use in RTL. | |
3569 | This is used with -noreg to mark the extent of lifespan | |
3570 | of any registers used in a user-visible variable's DECL_RTL. */ | |
3571 | ||
3572 | void | |
3573 | use_variable (rtl) | |
3574 | rtx rtl; | |
3575 | { | |
3576 | if (GET_CODE (rtl) == REG) | |
3577 | /* This is a register variable. */ | |
38a448ca | 3578 | emit_insn (gen_rtx_USE (VOIDmode, rtl)); |
6f086dfc RS |
3579 | else if (GET_CODE (rtl) == MEM |
3580 | && GET_CODE (XEXP (rtl, 0)) == REG | |
3581 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
3582 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
3583 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
3584 | /* This is a variable-sized structure. */ | |
38a448ca | 3585 | emit_insn (gen_rtx_USE (VOIDmode, XEXP (rtl, 0))); |
6f086dfc RS |
3586 | } |
3587 | ||
3588 | /* Like use_variable except that it outputs the USEs after INSN | |
3589 | instead of at the end of the insn-chain. */ | |
3590 | ||
3591 | void | |
3592 | use_variable_after (rtl, insn) | |
3593 | rtx rtl, insn; | |
3594 | { | |
3595 | if (GET_CODE (rtl) == REG) | |
3596 | /* This is a register variable. */ | |
38a448ca | 3597 | emit_insn_after (gen_rtx_USE (VOIDmode, rtl), insn); |
6f086dfc RS |
3598 | else if (GET_CODE (rtl) == MEM |
3599 | && GET_CODE (XEXP (rtl, 0)) == REG | |
3600 | && (REGNO (XEXP (rtl, 0)) < FIRST_VIRTUAL_REGISTER | |
3601 | || REGNO (XEXP (rtl, 0)) > LAST_VIRTUAL_REGISTER) | |
3602 | && XEXP (rtl, 0) != current_function_internal_arg_pointer) | |
3603 | /* This is a variable-sized structure. */ | |
38a448ca | 3604 | emit_insn_after (gen_rtx_USE (VOIDmode, XEXP (rtl, 0)), insn); |
6f086dfc RS |
3605 | } |
3606 | \f | |
3607 | int | |
3608 | max_parm_reg_num () | |
3609 | { | |
3610 | return max_parm_reg; | |
3611 | } | |
3612 | ||
3613 | /* Return the first insn following those generated by `assign_parms'. */ | |
3614 | ||
3615 | rtx | |
3616 | get_first_nonparm_insn () | |
3617 | { | |
3618 | if (last_parm_insn) | |
3619 | return NEXT_INSN (last_parm_insn); | |
3620 | return get_insns (); | |
3621 | } | |
3622 | ||
5378192b RS |
3623 | /* Return the first NOTE_INSN_BLOCK_BEG note in the function. |
3624 | Crash if there is none. */ | |
3625 | ||
3626 | rtx | |
3627 | get_first_block_beg () | |
3628 | { | |
3629 | register rtx searcher; | |
3630 | register rtx insn = get_first_nonparm_insn (); | |
3631 | ||
3632 | for (searcher = insn; searcher; searcher = NEXT_INSN (searcher)) | |
3633 | if (GET_CODE (searcher) == NOTE | |
3634 | && NOTE_LINE_NUMBER (searcher) == NOTE_INSN_BLOCK_BEG) | |
3635 | return searcher; | |
3636 | ||
3637 | abort (); /* Invalid call to this function. (See comments above.) */ | |
3638 | return NULL_RTX; | |
3639 | } | |
3640 | ||
d181c154 RS |
3641 | /* Return 1 if EXP is an aggregate type (or a value with aggregate type). |
3642 | This means a type for which function calls must pass an address to the | |
3643 | function or get an address back from the function. | |
3644 | EXP may be a type node or an expression (whose type is tested). */ | |
6f086dfc RS |
3645 | |
3646 | int | |
3647 | aggregate_value_p (exp) | |
3648 | tree exp; | |
3649 | { | |
9d790a4f RS |
3650 | int i, regno, nregs; |
3651 | rtx reg; | |
d181c154 RS |
3652 | tree type; |
3653 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 't') | |
3654 | type = exp; | |
3655 | else | |
3656 | type = TREE_TYPE (exp); | |
3657 | ||
3658 | if (RETURN_IN_MEMORY (type)) | |
6f086dfc | 3659 | return 1; |
956d6950 | 3660 | /* Types that are TREE_ADDRESSABLE must be constructed in memory, |
49a2e5b2 DE |
3661 | and thus can't be returned in registers. */ |
3662 | if (TREE_ADDRESSABLE (type)) | |
3663 | return 1; | |
05e3bdb9 | 3664 | if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type)) |
6f086dfc | 3665 | return 1; |
9d790a4f RS |
3666 | /* Make sure we have suitable call-clobbered regs to return |
3667 | the value in; if not, we must return it in memory. */ | |
d181c154 | 3668 | reg = hard_function_value (type, 0); |
e71f7aa5 JW |
3669 | |
3670 | /* If we have something other than a REG (e.g. a PARALLEL), then assume | |
3671 | it is OK. */ | |
3672 | if (GET_CODE (reg) != REG) | |
3673 | return 0; | |
3674 | ||
9d790a4f | 3675 | regno = REGNO (reg); |
d181c154 | 3676 | nregs = HARD_REGNO_NREGS (regno, TYPE_MODE (type)); |
9d790a4f RS |
3677 | for (i = 0; i < nregs; i++) |
3678 | if (! call_used_regs[regno + i]) | |
3679 | return 1; | |
6f086dfc RS |
3680 | return 0; |
3681 | } | |
3682 | \f | |
3683 | /* Assign RTL expressions to the function's parameters. | |
3684 | This may involve copying them into registers and using | |
3685 | those registers as the RTL for them. | |
3686 | ||
3687 | If SECOND_TIME is non-zero it means that this function is being | |
3688 | called a second time. This is done by integrate.c when a function's | |
3689 | compilation is deferred. We need to come back here in case the | |
3690 | FUNCTION_ARG macro computes items needed for the rest of the compilation | |
3691 | (such as changing which registers are fixed or caller-saved). But suppress | |
3692 | writing any insns or setting DECL_RTL of anything in this case. */ | |
3693 | ||
3694 | void | |
3695 | assign_parms (fndecl, second_time) | |
3696 | tree fndecl; | |
3697 | int second_time; | |
3698 | { | |
3699 | register tree parm; | |
3700 | register rtx entry_parm = 0; | |
3701 | register rtx stack_parm = 0; | |
3702 | CUMULATIVE_ARGS args_so_far; | |
621061f4 RK |
3703 | enum machine_mode promoted_mode, passed_mode; |
3704 | enum machine_mode nominal_mode, promoted_nominal_mode; | |
00d8a4c1 | 3705 | int unsignedp; |
6f086dfc RS |
3706 | /* Total space needed so far for args on the stack, |
3707 | given as a constant and a tree-expression. */ | |
3708 | struct args_size stack_args_size; | |
3709 | tree fntype = TREE_TYPE (fndecl); | |
3710 | tree fnargs = DECL_ARGUMENTS (fndecl); | |
3711 | /* This is used for the arg pointer when referring to stack args. */ | |
3712 | rtx internal_arg_pointer; | |
3713 | /* This is a dummy PARM_DECL that we used for the function result if | |
3714 | the function returns a structure. */ | |
3715 | tree function_result_decl = 0; | |
6f086dfc | 3716 | int varargs_setup = 0; |
3412b298 | 3717 | rtx conversion_insns = 0; |
6f086dfc RS |
3718 | |
3719 | /* Nonzero if the last arg is named `__builtin_va_alist', | |
3720 | which is used on some machines for old-fashioned non-ANSI varargs.h; | |
3721 | this should be stuck onto the stack as if it had arrived there. */ | |
3b69d50e RK |
3722 | int hide_last_arg |
3723 | = (current_function_varargs | |
3724 | && fnargs | |
6f086dfc RS |
3725 | && (parm = tree_last (fnargs)) != 0 |
3726 | && DECL_NAME (parm) | |
3727 | && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)), | |
3728 | "__builtin_va_alist"))); | |
3729 | ||
3730 | /* Nonzero if function takes extra anonymous args. | |
3731 | This means the last named arg must be on the stack | |
0f41302f | 3732 | right before the anonymous ones. */ |
6f086dfc RS |
3733 | int stdarg |
3734 | = (TYPE_ARG_TYPES (fntype) != 0 | |
3735 | && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
3736 | != void_type_node)); | |
3737 | ||
ebb904cb RK |
3738 | current_function_stdarg = stdarg; |
3739 | ||
6f086dfc RS |
3740 | /* If the reg that the virtual arg pointer will be translated into is |
3741 | not a fixed reg or is the stack pointer, make a copy of the virtual | |
3742 | arg pointer, and address parms via the copy. The frame pointer is | |
3743 | considered fixed even though it is not marked as such. | |
3744 | ||
3745 | The second time through, simply use ap to avoid generating rtx. */ | |
3746 | ||
3747 | if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM | |
3748 | || ! (fixed_regs[ARG_POINTER_REGNUM] | |
3749 | || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)) | |
3750 | && ! second_time) | |
3751 | internal_arg_pointer = copy_to_reg (virtual_incoming_args_rtx); | |
3752 | else | |
3753 | internal_arg_pointer = virtual_incoming_args_rtx; | |
3754 | current_function_internal_arg_pointer = internal_arg_pointer; | |
3755 | ||
3756 | stack_args_size.constant = 0; | |
3757 | stack_args_size.var = 0; | |
3758 | ||
3759 | /* If struct value address is treated as the first argument, make it so. */ | |
3760 | if (aggregate_value_p (DECL_RESULT (fndecl)) | |
3761 | && ! current_function_returns_pcc_struct | |
3762 | && struct_value_incoming_rtx == 0) | |
3763 | { | |
f9f29478 | 3764 | tree type = build_pointer_type (TREE_TYPE (fntype)); |
6f086dfc | 3765 | |
5f4f0e22 | 3766 | function_result_decl = build_decl (PARM_DECL, NULL_TREE, type); |
6f086dfc RS |
3767 | |
3768 | DECL_ARG_TYPE (function_result_decl) = type; | |
3769 | TREE_CHAIN (function_result_decl) = fnargs; | |
3770 | fnargs = function_result_decl; | |
3771 | } | |
3772 | ||
e9a25f70 JL |
3773 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; |
3774 | parm_reg_stack_loc = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
3775 | bzero ((char *) parm_reg_stack_loc, max_parm_reg * sizeof (rtx)); | |
6f086dfc RS |
3776 | |
3777 | #ifdef INIT_CUMULATIVE_INCOMING_ARGS | |
ea0d4c4b | 3778 | INIT_CUMULATIVE_INCOMING_ARGS (args_so_far, fntype, NULL_RTX); |
6f086dfc | 3779 | #else |
2c7ee1a6 | 3780 | INIT_CUMULATIVE_ARGS (args_so_far, fntype, NULL_RTX, 0); |
6f086dfc RS |
3781 | #endif |
3782 | ||
3783 | /* We haven't yet found an argument that we must push and pretend the | |
3784 | caller did. */ | |
3785 | current_function_pretend_args_size = 0; | |
3786 | ||
3787 | for (parm = fnargs; parm; parm = TREE_CHAIN (parm)) | |
3788 | { | |
05e3bdb9 | 3789 | int aggregate = AGGREGATE_TYPE_P (TREE_TYPE (parm)); |
6f086dfc RS |
3790 | struct args_size stack_offset; |
3791 | struct args_size arg_size; | |
3792 | int passed_pointer = 0; | |
621061f4 | 3793 | int did_conversion = 0; |
6f086dfc | 3794 | tree passed_type = DECL_ARG_TYPE (parm); |
621061f4 | 3795 | tree nominal_type = TREE_TYPE (parm); |
6f086dfc RS |
3796 | |
3797 | /* Set LAST_NAMED if this is last named arg before some | |
bf9c83fe | 3798 | anonymous args. */ |
6f086dfc RS |
3799 | int last_named = ((TREE_CHAIN (parm) == 0 |
3800 | || DECL_NAME (TREE_CHAIN (parm)) == 0) | |
3b69d50e | 3801 | && (stdarg || current_function_varargs)); |
bf9c83fe JW |
3802 | /* Set NAMED_ARG if this arg should be treated as a named arg. For |
3803 | most machines, if this is a varargs/stdarg function, then we treat | |
3804 | the last named arg as if it were anonymous too. */ | |
e5e809f4 | 3805 | int named_arg = STRICT_ARGUMENT_NAMING ? 1 : ! last_named; |
6f086dfc RS |
3806 | |
3807 | if (TREE_TYPE (parm) == error_mark_node | |
3808 | /* This can happen after weird syntax errors | |
3809 | or if an enum type is defined among the parms. */ | |
3810 | || TREE_CODE (parm) != PARM_DECL | |
3811 | || passed_type == NULL) | |
3812 | { | |
38a448ca RH |
3813 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) |
3814 | = gen_rtx_MEM (BLKmode, const0_rtx); | |
6f086dfc RS |
3815 | TREE_USED (parm) = 1; |
3816 | continue; | |
3817 | } | |
3818 | ||
3819 | /* For varargs.h function, save info about regs and stack space | |
3820 | used by the individual args, not including the va_alist arg. */ | |
3b69d50e | 3821 | if (hide_last_arg && last_named) |
6f086dfc RS |
3822 | current_function_args_info = args_so_far; |
3823 | ||
3824 | /* Find mode of arg as it is passed, and mode of arg | |
3825 | as it should be during execution of this function. */ | |
3826 | passed_mode = TYPE_MODE (passed_type); | |
621061f4 | 3827 | nominal_mode = TYPE_MODE (nominal_type); |
6f086dfc | 3828 | |
16bae307 RS |
3829 | /* If the parm's mode is VOID, its value doesn't matter, |
3830 | and avoid the usual things like emit_move_insn that could crash. */ | |
3831 | if (nominal_mode == VOIDmode) | |
3832 | { | |
3833 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) = const0_rtx; | |
3834 | continue; | |
3835 | } | |
3836 | ||
3f46679a RK |
3837 | /* If the parm is to be passed as a transparent union, use the |
3838 | type of the first field for the tests below. We have already | |
3839 | verified that the modes are the same. */ | |
3840 | if (DECL_TRANSPARENT_UNION (parm) | |
3841 | || TYPE_TRANSPARENT_UNION (passed_type)) | |
3842 | passed_type = TREE_TYPE (TYPE_FIELDS (passed_type)); | |
3843 | ||
a14ae508 RK |
3844 | /* See if this arg was passed by invisible reference. It is if |
3845 | it is an object whose size depends on the contents of the | |
3846 | object itself or if the machine requires these objects be passed | |
3847 | that way. */ | |
3848 | ||
3849 | if ((TREE_CODE (TYPE_SIZE (passed_type)) != INTEGER_CST | |
3850 | && contains_placeholder_p (TYPE_SIZE (passed_type))) | |
657bb6dc | 3851 | || TREE_ADDRESSABLE (passed_type) |
6f086dfc | 3852 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
a14ae508 | 3853 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, passed_mode, |
bf9c83fe | 3854 | passed_type, named_arg) |
a14ae508 RK |
3855 | #endif |
3856 | ) | |
6f086dfc | 3857 | { |
621061f4 | 3858 | passed_type = nominal_type = build_pointer_type (passed_type); |
6f086dfc RS |
3859 | passed_pointer = 1; |
3860 | passed_mode = nominal_mode = Pmode; | |
3861 | } | |
6f086dfc | 3862 | |
a53e14c0 RK |
3863 | promoted_mode = passed_mode; |
3864 | ||
3865 | #ifdef PROMOTE_FUNCTION_ARGS | |
3866 | /* Compute the mode in which the arg is actually extended to. */ | |
7940255d | 3867 | unsignedp = TREE_UNSIGNED (passed_type); |
a5a52dbc | 3868 | promoted_mode = promote_mode (passed_type, promoted_mode, &unsignedp, 1); |
a53e14c0 RK |
3869 | #endif |
3870 | ||
6f086dfc RS |
3871 | /* Let machine desc say which reg (if any) the parm arrives in. |
3872 | 0 means it arrives on the stack. */ | |
3873 | #ifdef FUNCTION_INCOMING_ARG | |
a53e14c0 | 3874 | entry_parm = FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
bf9c83fe | 3875 | passed_type, named_arg); |
6f086dfc | 3876 | #else |
a53e14c0 | 3877 | entry_parm = FUNCTION_ARG (args_so_far, promoted_mode, |
bf9c83fe | 3878 | passed_type, named_arg); |
6f086dfc RS |
3879 | #endif |
3880 | ||
621061f4 RK |
3881 | if (entry_parm == 0) |
3882 | promoted_mode = passed_mode; | |
a53e14c0 | 3883 | |
6f086dfc RS |
3884 | #ifdef SETUP_INCOMING_VARARGS |
3885 | /* If this is the last named parameter, do any required setup for | |
3886 | varargs or stdargs. We need to know about the case of this being an | |
3887 | addressable type, in which case we skip the registers it | |
3888 | would have arrived in. | |
3889 | ||
3890 | For stdargs, LAST_NAMED will be set for two parameters, the one that | |
3891 | is actually the last named, and the dummy parameter. We only | |
3892 | want to do this action once. | |
3893 | ||
3894 | Also, indicate when RTL generation is to be suppressed. */ | |
3895 | if (last_named && !varargs_setup) | |
3896 | { | |
621061f4 | 3897 | SETUP_INCOMING_VARARGS (args_so_far, promoted_mode, passed_type, |
6f086dfc RS |
3898 | current_function_pretend_args_size, |
3899 | second_time); | |
3900 | varargs_setup = 1; | |
3901 | } | |
3902 | #endif | |
3903 | ||
3904 | /* Determine parm's home in the stack, | |
3905 | in case it arrives in the stack or we should pretend it did. | |
3906 | ||
3907 | Compute the stack position and rtx where the argument arrives | |
3908 | and its size. | |
3909 | ||
3910 | There is one complexity here: If this was a parameter that would | |
3911 | have been passed in registers, but wasn't only because it is | |
3912 | __builtin_va_alist, we want locate_and_pad_parm to treat it as if | |
3913 | it came in a register so that REG_PARM_STACK_SPACE isn't skipped. | |
3914 | In this case, we call FUNCTION_ARG with NAMED set to 1 instead of | |
3915 | 0 as it was the previous time. */ | |
3916 | ||
621061f4 | 3917 | locate_and_pad_parm (promoted_mode, passed_type, |
6f086dfc RS |
3918 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3919 | 1, | |
3920 | #else | |
3921 | #ifdef FUNCTION_INCOMING_ARG | |
621061f4 | 3922 | FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
6f086dfc | 3923 | passed_type, |
bf9c83fe | 3924 | (named_arg |
6f086dfc RS |
3925 | || varargs_setup)) != 0, |
3926 | #else | |
621061f4 | 3927 | FUNCTION_ARG (args_so_far, promoted_mode, |
6f086dfc | 3928 | passed_type, |
bf9c83fe | 3929 | named_arg || varargs_setup) != 0, |
6f086dfc RS |
3930 | #endif |
3931 | #endif | |
3932 | fndecl, &stack_args_size, &stack_offset, &arg_size); | |
3933 | ||
3934 | if (! second_time) | |
3935 | { | |
3936 | rtx offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
3937 | ||
3938 | if (offset_rtx == const0_rtx) | |
38a448ca | 3939 | stack_parm = gen_rtx_MEM (promoted_mode, internal_arg_pointer); |
6f086dfc | 3940 | else |
38a448ca RH |
3941 | stack_parm = gen_rtx_MEM (promoted_mode, |
3942 | gen_rtx_PLUS (Pmode, | |
3943 | internal_arg_pointer, | |
3944 | offset_rtx)); | |
6f086dfc RS |
3945 | |
3946 | /* If this is a memory ref that contains aggregate components, | |
a00285d0 RK |
3947 | mark it as such for cse and loop optimize. Likewise if it |
3948 | is readonly. */ | |
6f086dfc | 3949 | MEM_IN_STRUCT_P (stack_parm) = aggregate; |
a00285d0 | 3950 | RTX_UNCHANGING_P (stack_parm) = TREE_READONLY (parm); |
41472af8 | 3951 | MEM_ALIAS_SET (stack_parm) = get_alias_set (parm); |
6f086dfc RS |
3952 | } |
3953 | ||
3954 | /* If this parameter was passed both in registers and in the stack, | |
3955 | use the copy on the stack. */ | |
621061f4 | 3956 | if (MUST_PASS_IN_STACK (promoted_mode, passed_type)) |
6f086dfc RS |
3957 | entry_parm = 0; |
3958 | ||
461beb10 | 3959 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
6f086dfc RS |
3960 | /* If this parm was passed part in regs and part in memory, |
3961 | pretend it arrived entirely in memory | |
3962 | by pushing the register-part onto the stack. | |
3963 | ||
3964 | In the special case of a DImode or DFmode that is split, | |
3965 | we could put it together in a pseudoreg directly, | |
3966 | but for now that's not worth bothering with. */ | |
3967 | ||
3968 | if (entry_parm) | |
3969 | { | |
621061f4 | 3970 | int nregs = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, promoted_mode, |
bf9c83fe | 3971 | passed_type, named_arg); |
6f086dfc RS |
3972 | |
3973 | if (nregs > 0) | |
3974 | { | |
3975 | current_function_pretend_args_size | |
3976 | = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / BITS_PER_UNIT) - 1) | |
3977 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
3978 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
3979 | ||
3980 | if (! second_time) | |
5c4cdc9f JW |
3981 | { |
3982 | /* Handle calls that pass values in multiple non-contiguous | |
3983 | locations. The Irix 6 ABI has examples of this. */ | |
3984 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
3985 | emit_group_store (validize_mem (stack_parm), entry_parm, |
3986 | int_size_in_bytes (TREE_TYPE (parm)), | |
3987 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
3988 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
3989 | else |
3990 | move_block_from_reg (REGNO (entry_parm), | |
3991 | validize_mem (stack_parm), nregs, | |
3992 | int_size_in_bytes (TREE_TYPE (parm))); | |
3993 | } | |
6f086dfc RS |
3994 | entry_parm = stack_parm; |
3995 | } | |
3996 | } | |
461beb10 | 3997 | #endif |
6f086dfc RS |
3998 | |
3999 | /* If we didn't decide this parm came in a register, | |
4000 | by default it came on the stack. */ | |
4001 | if (entry_parm == 0) | |
4002 | entry_parm = stack_parm; | |
4003 | ||
4004 | /* Record permanently how this parm was passed. */ | |
4005 | if (! second_time) | |
4006 | DECL_INCOMING_RTL (parm) = entry_parm; | |
4007 | ||
4008 | /* If there is actually space on the stack for this parm, | |
4009 | count it in stack_args_size; otherwise set stack_parm to 0 | |
4010 | to indicate there is no preallocated stack slot for the parm. */ | |
4011 | ||
4012 | if (entry_parm == stack_parm | |
d9ca49d5 | 4013 | #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE) |
6f086dfc | 4014 | /* On some machines, even if a parm value arrives in a register |
d9ca49d5 JW |
4015 | there is still an (uninitialized) stack slot allocated for it. |
4016 | ||
4017 | ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell | |
4018 | whether this parameter already has a stack slot allocated, | |
4019 | because an arg block exists only if current_function_args_size | |
abc95ed3 | 4020 | is larger than some threshold, and we haven't calculated that |
d9ca49d5 JW |
4021 | yet. So, for now, we just assume that stack slots never exist |
4022 | in this case. */ | |
6f086dfc RS |
4023 | || REG_PARM_STACK_SPACE (fndecl) > 0 |
4024 | #endif | |
4025 | ) | |
4026 | { | |
4027 | stack_args_size.constant += arg_size.constant; | |
4028 | if (arg_size.var) | |
4029 | ADD_PARM_SIZE (stack_args_size, arg_size.var); | |
4030 | } | |
4031 | else | |
4032 | /* No stack slot was pushed for this parm. */ | |
4033 | stack_parm = 0; | |
4034 | ||
4035 | /* Update info on where next arg arrives in registers. */ | |
4036 | ||
621061f4 | 4037 | FUNCTION_ARG_ADVANCE (args_so_far, promoted_mode, |
bf9c83fe | 4038 | passed_type, named_arg); |
6f086dfc | 4039 | |
0f41302f | 4040 | /* If this is our second time through, we are done with this parm. */ |
6f086dfc RS |
4041 | if (second_time) |
4042 | continue; | |
4043 | ||
e16c591a RS |
4044 | /* If we can't trust the parm stack slot to be aligned enough |
4045 | for its ultimate type, don't use that slot after entry. | |
4046 | We'll make another stack slot, if we need one. */ | |
4047 | { | |
e16c591a | 4048 | int thisparm_boundary |
621061f4 | 4049 | = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type); |
e16c591a RS |
4050 | |
4051 | if (GET_MODE_ALIGNMENT (nominal_mode) > thisparm_boundary) | |
4052 | stack_parm = 0; | |
4053 | } | |
4054 | ||
cb61f66f RS |
4055 | /* If parm was passed in memory, and we need to convert it on entry, |
4056 | don't store it back in that same slot. */ | |
4057 | if (entry_parm != 0 | |
4058 | && nominal_mode != BLKmode && nominal_mode != passed_mode) | |
4059 | stack_parm = 0; | |
4060 | ||
4061 | #if 0 | |
6f086dfc RS |
4062 | /* Now adjust STACK_PARM to the mode and precise location |
4063 | where this parameter should live during execution, | |
4064 | if we discover that it must live in the stack during execution. | |
4065 | To make debuggers happier on big-endian machines, we store | |
4066 | the value in the last bytes of the space available. */ | |
4067 | ||
4068 | if (nominal_mode != BLKmode && nominal_mode != passed_mode | |
4069 | && stack_parm != 0) | |
4070 | { | |
4071 | rtx offset_rtx; | |
4072 | ||
f76b9db2 ILT |
4073 | if (BYTES_BIG_ENDIAN |
4074 | && GET_MODE_SIZE (nominal_mode) < UNITS_PER_WORD) | |
6f086dfc RS |
4075 | stack_offset.constant += (GET_MODE_SIZE (passed_mode) |
4076 | - GET_MODE_SIZE (nominal_mode)); | |
6f086dfc RS |
4077 | |
4078 | offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4079 | if (offset_rtx == const0_rtx) | |
38a448ca | 4080 | stack_parm = gen_rtx_MEM (nominal_mode, internal_arg_pointer); |
6f086dfc | 4081 | else |
38a448ca RH |
4082 | stack_parm = gen_rtx_MEM (nominal_mode, |
4083 | gen_rtx_PLUS (Pmode, | |
4084 | internal_arg_pointer, | |
4085 | offset_rtx)); | |
6f086dfc RS |
4086 | |
4087 | /* If this is a memory ref that contains aggregate components, | |
4088 | mark it as such for cse and loop optimize. */ | |
4089 | MEM_IN_STRUCT_P (stack_parm) = aggregate; | |
4090 | } | |
cb61f66f | 4091 | #endif /* 0 */ |
6f086dfc | 4092 | |
9dc0f531 RK |
4093 | #ifdef STACK_REGS |
4094 | /* We need this "use" info, because the gcc-register->stack-register | |
4095 | converter in reg-stack.c needs to know which registers are active | |
4096 | at the start of the function call. The actual parameter loading | |
4097 | instructions are not always available then anymore, since they might | |
4098 | have been optimised away. */ | |
4099 | ||
4100 | if (GET_CODE (entry_parm) == REG && !(hide_last_arg && last_named)) | |
38a448ca | 4101 | emit_insn (gen_rtx_USE (GET_MODE (entry_parm), entry_parm)); |
9dc0f531 RK |
4102 | #endif |
4103 | ||
6f086dfc RS |
4104 | /* ENTRY_PARM is an RTX for the parameter as it arrives, |
4105 | in the mode in which it arrives. | |
4106 | STACK_PARM is an RTX for a stack slot where the parameter can live | |
4107 | during the function (in case we want to put it there). | |
4108 | STACK_PARM is 0 if no stack slot was pushed for it. | |
4109 | ||
4110 | Now output code if necessary to convert ENTRY_PARM to | |
4111 | the type in which this function declares it, | |
4112 | and store that result in an appropriate place, | |
4113 | which may be a pseudo reg, may be STACK_PARM, | |
4114 | or may be a local stack slot if STACK_PARM is 0. | |
4115 | ||
4116 | Set DECL_RTL to that place. */ | |
4117 | ||
5c4cdc9f | 4118 | if (nominal_mode == BLKmode || GET_CODE (entry_parm) == PARALLEL) |
6f086dfc | 4119 | { |
5c4cdc9f JW |
4120 | /* If a BLKmode arrives in registers, copy it to a stack slot. |
4121 | Handle calls that pass values in multiple non-contiguous | |
4122 | locations. The Irix 6 ABI has examples of this. */ | |
4123 | if (GET_CODE (entry_parm) == REG | |
4124 | || GET_CODE (entry_parm) == PARALLEL) | |
6f086dfc | 4125 | { |
621061f4 RK |
4126 | int size_stored |
4127 | = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm)), | |
4128 | UNITS_PER_WORD); | |
6f086dfc RS |
4129 | |
4130 | /* Note that we will be storing an integral number of words. | |
4131 | So we have to be careful to ensure that we allocate an | |
4132 | integral number of words. We do this below in the | |
4133 | assign_stack_local if space was not allocated in the argument | |
4134 | list. If it was, this will not work if PARM_BOUNDARY is not | |
4135 | a multiple of BITS_PER_WORD. It isn't clear how to fix this | |
4136 | if it becomes a problem. */ | |
4137 | ||
4138 | if (stack_parm == 0) | |
7e41ffa2 RS |
4139 | { |
4140 | stack_parm | |
621061f4 RK |
4141 | = assign_stack_local (GET_MODE (entry_parm), |
4142 | size_stored, 0); | |
4143 | ||
4144 | /* If this is a memory ref that contains aggregate | |
4145 | components, mark it as such for cse and loop optimize. */ | |
7e41ffa2 RS |
4146 | MEM_IN_STRUCT_P (stack_parm) = aggregate; |
4147 | } | |
4148 | ||
6f086dfc RS |
4149 | else if (PARM_BOUNDARY % BITS_PER_WORD != 0) |
4150 | abort (); | |
4151 | ||
7a30f0c4 JW |
4152 | if (TREE_READONLY (parm)) |
4153 | RTX_UNCHANGING_P (stack_parm) = 1; | |
4154 | ||
5c4cdc9f JW |
4155 | /* Handle calls that pass values in multiple non-contiguous |
4156 | locations. The Irix 6 ABI has examples of this. */ | |
4157 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4158 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4159 | int_size_in_bytes (TREE_TYPE (parm)), | |
4160 | (TYPE_ALIGN (TREE_TYPE (parm)) | |
4161 | / BITS_PER_UNIT)); | |
5c4cdc9f JW |
4162 | else |
4163 | move_block_from_reg (REGNO (entry_parm), | |
4164 | validize_mem (stack_parm), | |
4165 | size_stored / UNITS_PER_WORD, | |
4166 | int_size_in_bytes (TREE_TYPE (parm))); | |
6f086dfc RS |
4167 | } |
4168 | DECL_RTL (parm) = stack_parm; | |
4169 | } | |
74bd77a8 | 4170 | else if (! ((obey_regdecls && ! DECL_REGISTER (parm) |
a82ad570 | 4171 | && ! DECL_INLINE (fndecl)) |
6f086dfc RS |
4172 | /* layout_decl may set this. */ |
4173 | || TREE_ADDRESSABLE (parm) | |
4174 | || TREE_SIDE_EFFECTS (parm) | |
4175 | /* If -ffloat-store specified, don't put explicit | |
4176 | float variables into registers. */ | |
4177 | || (flag_float_store | |
4178 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE)) | |
4179 | /* Always assign pseudo to structure return or item passed | |
4180 | by invisible reference. */ | |
4181 | || passed_pointer || parm == function_result_decl) | |
4182 | { | |
00d8a4c1 RK |
4183 | /* Store the parm in a pseudoregister during the function, but we |
4184 | may need to do it in a wider mode. */ | |
4185 | ||
4186 | register rtx parmreg; | |
4e86caed | 4187 | int regno, regnoi = 0, regnor = 0; |
00d8a4c1 RK |
4188 | |
4189 | unsignedp = TREE_UNSIGNED (TREE_TYPE (parm)); | |
cd5b3469 | 4190 | |
621061f4 RK |
4191 | promoted_nominal_mode |
4192 | = promote_mode (TREE_TYPE (parm), nominal_mode, &unsignedp, 0); | |
6f086dfc | 4193 | |
621061f4 | 4194 | parmreg = gen_reg_rtx (promoted_nominal_mode); |
ddb7361a | 4195 | mark_user_reg (parmreg); |
6f086dfc RS |
4196 | |
4197 | /* If this was an item that we received a pointer to, set DECL_RTL | |
4198 | appropriately. */ | |
4199 | if (passed_pointer) | |
4200 | { | |
621061f4 | 4201 | DECL_RTL (parm) |
38a448ca | 4202 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)), parmreg); |
6f086dfc RS |
4203 | MEM_IN_STRUCT_P (DECL_RTL (parm)) = aggregate; |
4204 | } | |
4205 | else | |
4206 | DECL_RTL (parm) = parmreg; | |
4207 | ||
4208 | /* Copy the value into the register. */ | |
621061f4 RK |
4209 | if (nominal_mode != passed_mode |
4210 | || promoted_nominal_mode != promoted_mode) | |
86f8eff3 | 4211 | { |
621061f4 RK |
4212 | /* ENTRY_PARM has been converted to PROMOTED_MODE, its |
4213 | mode, by the caller. We now have to convert it to | |
4214 | NOMINAL_MODE, if different. However, PARMREG may be in | |
956d6950 | 4215 | a different mode than NOMINAL_MODE if it is being stored |
621061f4 RK |
4216 | promoted. |
4217 | ||
4218 | If ENTRY_PARM is a hard register, it might be in a register | |
86f8eff3 RK |
4219 | not valid for operating in its mode (e.g., an odd-numbered |
4220 | register for a DFmode). In that case, moves are the only | |
4221 | thing valid, so we can't do a convert from there. This | |
4222 | occurs when the calling sequence allow such misaligned | |
3412b298 JW |
4223 | usages. |
4224 | ||
4225 | In addition, the conversion may involve a call, which could | |
4226 | clobber parameters which haven't been copied to pseudo | |
4227 | registers yet. Therefore, we must first copy the parm to | |
4228 | a pseudo reg here, and save the conversion until after all | |
4229 | parameters have been moved. */ | |
4230 | ||
4231 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); | |
4232 | ||
4233 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
4234 | ||
4235 | push_to_sequence (conversion_insns); | |
ad241351 RK |
4236 | tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp); |
4237 | ||
621061f4 RK |
4238 | expand_assignment (parm, |
4239 | make_tree (nominal_type, tempreg), 0, 0); | |
3412b298 | 4240 | conversion_insns = get_insns (); |
621061f4 | 4241 | did_conversion = 1; |
3412b298 | 4242 | end_sequence (); |
86f8eff3 | 4243 | } |
6f086dfc RS |
4244 | else |
4245 | emit_move_insn (parmreg, validize_mem (entry_parm)); | |
4246 | ||
74bd77a8 RS |
4247 | /* If we were passed a pointer but the actual value |
4248 | can safely live in a register, put it in one. */ | |
16bae307 | 4249 | if (passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode |
74bd77a8 RS |
4250 | && ! ((obey_regdecls && ! DECL_REGISTER (parm) |
4251 | && ! DECL_INLINE (fndecl)) | |
4252 | /* layout_decl may set this. */ | |
4253 | || TREE_ADDRESSABLE (parm) | |
4254 | || TREE_SIDE_EFFECTS (parm) | |
4255 | /* If -ffloat-store specified, don't put explicit | |
4256 | float variables into registers. */ | |
4257 | || (flag_float_store | |
4258 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE))) | |
4259 | { | |
2654605a JW |
4260 | /* We can't use nominal_mode, because it will have been set to |
4261 | Pmode above. We must use the actual mode of the parm. */ | |
4262 | parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); | |
ddb7361a | 4263 | mark_user_reg (parmreg); |
74bd77a8 RS |
4264 | emit_move_insn (parmreg, DECL_RTL (parm)); |
4265 | DECL_RTL (parm) = parmreg; | |
c110c53d RS |
4266 | /* STACK_PARM is the pointer, not the parm, and PARMREG is |
4267 | now the parm. */ | |
4268 | stack_parm = 0; | |
74bd77a8 | 4269 | } |
137a2a7b DE |
4270 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
4271 | /* If we are passed an arg by reference and it is our responsibility | |
4272 | to make a copy, do it now. | |
4273 | PASSED_TYPE and PASSED mode now refer to the pointer, not the | |
4274 | original argument, so we must recreate them in the call to | |
4275 | FUNCTION_ARG_CALLEE_COPIES. */ | |
4276 | /* ??? Later add code to handle the case that if the argument isn't | |
4277 | modified, don't do the copy. */ | |
4278 | ||
4279 | else if (passed_pointer | |
4280 | && FUNCTION_ARG_CALLEE_COPIES (args_so_far, | |
4281 | TYPE_MODE (DECL_ARG_TYPE (parm)), | |
4282 | DECL_ARG_TYPE (parm), | |
bf9c83fe | 4283 | named_arg) |
926b1b99 | 4284 | && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) |
137a2a7b DE |
4285 | { |
4286 | rtx copy; | |
4287 | tree type = DECL_ARG_TYPE (parm); | |
4288 | ||
4289 | /* This sequence may involve a library call perhaps clobbering | |
4290 | registers that haven't been copied to pseudos yet. */ | |
4291 | ||
4292 | push_to_sequence (conversion_insns); | |
4293 | ||
4294 | if (TYPE_SIZE (type) == 0 | |
4295 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
1fd3ef7f | 4296 | /* This is a variable sized object. */ |
38a448ca RH |
4297 | copy = gen_rtx_MEM (BLKmode, |
4298 | allocate_dynamic_stack_space | |
4299 | (expr_size (parm), NULL_RTX, | |
4300 | TYPE_ALIGN (type))); | |
137a2a7b | 4301 | else |
1fd3ef7f RK |
4302 | copy = assign_stack_temp (TYPE_MODE (type), |
4303 | int_size_in_bytes (type), 1); | |
3668e76e | 4304 | MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type); |
e9a25f70 | 4305 | RTX_UNCHANGING_P (copy) = TREE_READONLY (parm); |
137a2a7b DE |
4306 | |
4307 | store_expr (parm, copy, 0); | |
4308 | emit_move_insn (parmreg, XEXP (copy, 0)); | |
86fa911a RK |
4309 | if (flag_check_memory_usage) |
4310 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, | |
4311 | XEXP (copy, 0), ptr_mode, | |
4312 | GEN_INT (int_size_in_bytes (type)), | |
4313 | TYPE_MODE (sizetype), | |
956d6950 JL |
4314 | GEN_INT (MEMORY_USE_RW), |
4315 | TYPE_MODE (integer_type_node)); | |
137a2a7b | 4316 | conversion_insns = get_insns (); |
621061f4 | 4317 | did_conversion = 1; |
137a2a7b DE |
4318 | end_sequence (); |
4319 | } | |
4320 | #endif /* FUNCTION_ARG_CALLEE_COPIES */ | |
74bd77a8 | 4321 | |
6f086dfc | 4322 | /* In any case, record the parm's desired stack location |
14aceb29 RS |
4323 | in case we later discover it must live in the stack. |
4324 | ||
4325 | If it is a COMPLEX value, store the stack location for both | |
4326 | halves. */ | |
4327 | ||
4328 | if (GET_CODE (parmreg) == CONCAT) | |
4329 | regno = MAX (REGNO (XEXP (parmreg, 0)), REGNO (XEXP (parmreg, 1))); | |
4330 | else | |
4331 | regno = REGNO (parmreg); | |
4332 | ||
e9a25f70 | 4333 | if (regno >= max_parm_reg) |
6f086dfc RS |
4334 | { |
4335 | rtx *new; | |
e9a25f70 | 4336 | int old_max_parm_reg = max_parm_reg; |
14aceb29 | 4337 | |
e9a25f70 JL |
4338 | /* It's slow to expand this one register at a time, |
4339 | but it's also rare and we need max_parm_reg to be | |
4340 | precisely correct. */ | |
4341 | max_parm_reg = regno + 1; | |
4342 | new = (rtx *) savealloc (max_parm_reg * sizeof (rtx)); | |
4c9a05bc | 4343 | bcopy ((char *) parm_reg_stack_loc, (char *) new, |
e9a25f70 JL |
4344 | old_max_parm_reg * sizeof (rtx)); |
4345 | bzero ((char *) (new + old_max_parm_reg), | |
4346 | (max_parm_reg - old_max_parm_reg) * sizeof (rtx)); | |
6f086dfc RS |
4347 | parm_reg_stack_loc = new; |
4348 | } | |
14aceb29 RS |
4349 | |
4350 | if (GET_CODE (parmreg) == CONCAT) | |
4351 | { | |
4352 | enum machine_mode submode = GET_MODE (XEXP (parmreg, 0)); | |
4353 | ||
a03caf76 RK |
4354 | regnor = REGNO (gen_realpart (submode, parmreg)); |
4355 | regnoi = REGNO (gen_imagpart (submode, parmreg)); | |
4356 | ||
7b1a0c14 RS |
4357 | if (stack_parm != 0) |
4358 | { | |
a03caf76 | 4359 | parm_reg_stack_loc[regnor] |
3d329b07 | 4360 | = gen_realpart (submode, stack_parm); |
a03caf76 | 4361 | parm_reg_stack_loc[regnoi] |
3d329b07 | 4362 | = gen_imagpart (submode, stack_parm); |
7b1a0c14 RS |
4363 | } |
4364 | else | |
4365 | { | |
a03caf76 RK |
4366 | parm_reg_stack_loc[regnor] = 0; |
4367 | parm_reg_stack_loc[regnoi] = 0; | |
7b1a0c14 | 4368 | } |
14aceb29 RS |
4369 | } |
4370 | else | |
4371 | parm_reg_stack_loc[REGNO (parmreg)] = stack_parm; | |
6f086dfc RS |
4372 | |
4373 | /* Mark the register as eliminable if we did no conversion | |
4374 | and it was copied from memory at a fixed offset, | |
4375 | and the arg pointer was not copied to a pseudo-reg. | |
4376 | If the arg pointer is a pseudo reg or the offset formed | |
4377 | an invalid address, such memory-equivalences | |
4378 | as we make here would screw up life analysis for it. */ | |
4379 | if (nominal_mode == passed_mode | |
621061f4 | 4380 | && ! did_conversion |
38b610ed ILT |
4381 | && stack_parm != 0 |
4382 | && GET_CODE (stack_parm) == MEM | |
6f086dfc RS |
4383 | && stack_offset.var == 0 |
4384 | && reg_mentioned_p (virtual_incoming_args_rtx, | |
38b610ed | 4385 | XEXP (stack_parm, 0))) |
a03caf76 RK |
4386 | { |
4387 | rtx linsn = get_last_insn (); | |
69685820 | 4388 | rtx sinsn, set; |
a03caf76 RK |
4389 | |
4390 | /* Mark complex types separately. */ | |
4391 | if (GET_CODE (parmreg) == CONCAT) | |
69685820 RK |
4392 | /* Scan backwards for the set of the real and |
4393 | imaginary parts. */ | |
4394 | for (sinsn = linsn; sinsn != 0; | |
4395 | sinsn = prev_nonnote_insn (sinsn)) | |
4396 | { | |
4397 | set = single_set (sinsn); | |
4398 | if (set != 0 | |
4399 | && SET_DEST (set) == regno_reg_rtx [regnoi]) | |
4400 | REG_NOTES (sinsn) | |
38a448ca RH |
4401 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4402 | parm_reg_stack_loc[regnoi], | |
4403 | REG_NOTES (sinsn)); | |
69685820 RK |
4404 | else if (set != 0 |
4405 | && SET_DEST (set) == regno_reg_rtx [regnor]) | |
4406 | REG_NOTES (sinsn) | |
38a448ca RH |
4407 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4408 | parm_reg_stack_loc[regnor], | |
4409 | REG_NOTES (sinsn)); | |
69685820 RK |
4410 | } |
4411 | else if ((set = single_set (linsn)) != 0 | |
4412 | && SET_DEST (set) == parmreg) | |
a03caf76 | 4413 | REG_NOTES (linsn) |
38a448ca RH |
4414 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4415 | stack_parm, REG_NOTES (linsn)); | |
a03caf76 | 4416 | } |
6f086dfc RS |
4417 | |
4418 | /* For pointer data type, suggest pointer register. */ | |
e5e809f4 | 4419 | if (POINTER_TYPE_P (TREE_TYPE (parm))) |
6c6166bd RK |
4420 | mark_reg_pointer (parmreg, |
4421 | (TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))) | |
4422 | / BITS_PER_UNIT)); | |
6f086dfc RS |
4423 | } |
4424 | else | |
4425 | { | |
4426 | /* Value must be stored in the stack slot STACK_PARM | |
4427 | during function execution. */ | |
4428 | ||
621061f4 | 4429 | if (promoted_mode != nominal_mode) |
86f8eff3 RK |
4430 | { |
4431 | /* Conversion is required. */ | |
3412b298 JW |
4432 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); |
4433 | ||
4434 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
86f8eff3 | 4435 | |
3412b298 JW |
4436 | push_to_sequence (conversion_insns); |
4437 | entry_parm = convert_to_mode (nominal_mode, tempreg, | |
a53e14c0 | 4438 | TREE_UNSIGNED (TREE_TYPE (parm))); |
de957303 DE |
4439 | if (stack_parm) |
4440 | { | |
4441 | /* ??? This may need a big-endian conversion on sparc64. */ | |
4442 | stack_parm = change_address (stack_parm, nominal_mode, | |
4443 | NULL_RTX); | |
4444 | } | |
3412b298 | 4445 | conversion_insns = get_insns (); |
621061f4 | 4446 | did_conversion = 1; |
3412b298 | 4447 | end_sequence (); |
86f8eff3 | 4448 | } |
6f086dfc RS |
4449 | |
4450 | if (entry_parm != stack_parm) | |
4451 | { | |
4452 | if (stack_parm == 0) | |
7e41ffa2 RS |
4453 | { |
4454 | stack_parm | |
4455 | = assign_stack_local (GET_MODE (entry_parm), | |
4456 | GET_MODE_SIZE (GET_MODE (entry_parm)), 0); | |
4457 | /* If this is a memory ref that contains aggregate components, | |
4458 | mark it as such for cse and loop optimize. */ | |
4459 | MEM_IN_STRUCT_P (stack_parm) = aggregate; | |
4460 | } | |
4461 | ||
621061f4 | 4462 | if (promoted_mode != nominal_mode) |
3412b298 JW |
4463 | { |
4464 | push_to_sequence (conversion_insns); | |
4465 | emit_move_insn (validize_mem (stack_parm), | |
4466 | validize_mem (entry_parm)); | |
4467 | conversion_insns = get_insns (); | |
4468 | end_sequence (); | |
4469 | } | |
4470 | else | |
4471 | emit_move_insn (validize_mem (stack_parm), | |
4472 | validize_mem (entry_parm)); | |
6f086dfc | 4473 | } |
e5e809f4 | 4474 | if (flag_check_memory_usage) |
86fa911a RK |
4475 | { |
4476 | push_to_sequence (conversion_insns); | |
4477 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, | |
4478 | XEXP (stack_parm, 0), ptr_mode, | |
4479 | GEN_INT (GET_MODE_SIZE (GET_MODE | |
4480 | (entry_parm))), | |
4481 | TYPE_MODE (sizetype), | |
956d6950 JL |
4482 | GEN_INT (MEMORY_USE_RW), |
4483 | TYPE_MODE (integer_type_node)); | |
6f086dfc | 4484 | |
86fa911a RK |
4485 | conversion_insns = get_insns (); |
4486 | end_sequence (); | |
4487 | } | |
6f086dfc RS |
4488 | DECL_RTL (parm) = stack_parm; |
4489 | } | |
4490 | ||
4491 | /* If this "parameter" was the place where we are receiving the | |
4492 | function's incoming structure pointer, set up the result. */ | |
4493 | if (parm == function_result_decl) | |
ccdecf58 RK |
4494 | { |
4495 | tree result = DECL_RESULT (fndecl); | |
4496 | tree restype = TREE_TYPE (result); | |
4497 | ||
4498 | DECL_RTL (result) | |
38a448ca | 4499 | = gen_rtx_MEM (DECL_MODE (result), DECL_RTL (parm)); |
ccdecf58 | 4500 | |
05e3bdb9 | 4501 | MEM_IN_STRUCT_P (DECL_RTL (result)) = AGGREGATE_TYPE_P (restype); |
ccdecf58 | 4502 | } |
6f086dfc RS |
4503 | |
4504 | if (TREE_THIS_VOLATILE (parm)) | |
4505 | MEM_VOLATILE_P (DECL_RTL (parm)) = 1; | |
4506 | if (TREE_READONLY (parm)) | |
4507 | RTX_UNCHANGING_P (DECL_RTL (parm)) = 1; | |
4508 | } | |
4509 | ||
3412b298 JW |
4510 | /* Output all parameter conversion instructions (possibly including calls) |
4511 | now that all parameters have been copied out of hard registers. */ | |
4512 | emit_insns (conversion_insns); | |
4513 | ||
6f086dfc RS |
4514 | last_parm_insn = get_last_insn (); |
4515 | ||
4516 | current_function_args_size = stack_args_size.constant; | |
4517 | ||
4518 | /* Adjust function incoming argument size for alignment and | |
4519 | minimum length. */ | |
4520 | ||
4521 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 4522 | #ifndef MAYBE_REG_PARM_STACK_SPACE |
6f086dfc RS |
4523 | current_function_args_size = MAX (current_function_args_size, |
4524 | REG_PARM_STACK_SPACE (fndecl)); | |
4525 | #endif | |
6f90e075 | 4526 | #endif |
6f086dfc RS |
4527 | |
4528 | #ifdef STACK_BOUNDARY | |
4529 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
4530 | ||
4531 | current_function_args_size | |
4532 | = ((current_function_args_size + STACK_BYTES - 1) | |
4533 | / STACK_BYTES) * STACK_BYTES; | |
4534 | #endif | |
4535 | ||
4536 | #ifdef ARGS_GROW_DOWNWARD | |
4537 | current_function_arg_offset_rtx | |
5f4f0e22 | 4538 | = (stack_args_size.var == 0 ? GEN_INT (-stack_args_size.constant) |
6f086dfc RS |
4539 | : expand_expr (size_binop (MINUS_EXPR, stack_args_size.var, |
4540 | size_int (-stack_args_size.constant)), | |
86fa911a | 4541 | NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD)); |
6f086dfc RS |
4542 | #else |
4543 | current_function_arg_offset_rtx = ARGS_SIZE_RTX (stack_args_size); | |
4544 | #endif | |
4545 | ||
4546 | /* See how many bytes, if any, of its args a function should try to pop | |
4547 | on return. */ | |
4548 | ||
64e6d9cc | 4549 | current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl), |
6f086dfc RS |
4550 | current_function_args_size); |
4551 | ||
3b69d50e RK |
4552 | /* For stdarg.h function, save info about |
4553 | regs and stack space used by the named args. */ | |
6f086dfc | 4554 | |
3b69d50e | 4555 | if (!hide_last_arg) |
6f086dfc RS |
4556 | current_function_args_info = args_so_far; |
4557 | ||
4558 | /* Set the rtx used for the function return value. Put this in its | |
4559 | own variable so any optimizers that need this information don't have | |
4560 | to include tree.h. Do this here so it gets done when an inlined | |
4561 | function gets output. */ | |
4562 | ||
4563 | current_function_return_rtx = DECL_RTL (DECL_RESULT (fndecl)); | |
4564 | } | |
4565 | \f | |
75dc3319 RK |
4566 | /* Indicate whether REGNO is an incoming argument to the current function |
4567 | that was promoted to a wider mode. If so, return the RTX for the | |
4568 | register (to get its mode). PMODE and PUNSIGNEDP are set to the mode | |
4569 | that REGNO is promoted from and whether the promotion was signed or | |
4570 | unsigned. */ | |
4571 | ||
4572 | #ifdef PROMOTE_FUNCTION_ARGS | |
4573 | ||
4574 | rtx | |
4575 | promoted_input_arg (regno, pmode, punsignedp) | |
4576 | int regno; | |
4577 | enum machine_mode *pmode; | |
4578 | int *punsignedp; | |
4579 | { | |
4580 | tree arg; | |
4581 | ||
4582 | for (arg = DECL_ARGUMENTS (current_function_decl); arg; | |
4583 | arg = TREE_CHAIN (arg)) | |
4584 | if (GET_CODE (DECL_INCOMING_RTL (arg)) == REG | |
621061f4 RK |
4585 | && REGNO (DECL_INCOMING_RTL (arg)) == regno |
4586 | && TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg))) | |
75dc3319 RK |
4587 | { |
4588 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg)); | |
4589 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (arg)); | |
4590 | ||
a5a52dbc | 4591 | mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1); |
75dc3319 RK |
4592 | if (mode == GET_MODE (DECL_INCOMING_RTL (arg)) |
4593 | && mode != DECL_MODE (arg)) | |
4594 | { | |
4595 | *pmode = DECL_MODE (arg); | |
4596 | *punsignedp = unsignedp; | |
4597 | return DECL_INCOMING_RTL (arg); | |
4598 | } | |
4599 | } | |
4600 | ||
4601 | return 0; | |
4602 | } | |
4603 | ||
4604 | #endif | |
4605 | \f | |
6f086dfc RS |
4606 | /* Compute the size and offset from the start of the stacked arguments for a |
4607 | parm passed in mode PASSED_MODE and with type TYPE. | |
4608 | ||
4609 | INITIAL_OFFSET_PTR points to the current offset into the stacked | |
4610 | arguments. | |
4611 | ||
4612 | The starting offset and size for this parm are returned in *OFFSET_PTR | |
4613 | and *ARG_SIZE_PTR, respectively. | |
4614 | ||
4615 | IN_REGS is non-zero if the argument will be passed in registers. It will | |
4616 | never be set if REG_PARM_STACK_SPACE is not defined. | |
4617 | ||
4618 | FNDECL is the function in which the argument was defined. | |
4619 | ||
4620 | There are two types of rounding that are done. The first, controlled by | |
4621 | FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument | |
4622 | list to be aligned to the specific boundary (in bits). This rounding | |
4623 | affects the initial and starting offsets, but not the argument size. | |
4624 | ||
4625 | The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY, | |
4626 | optionally rounds the size of the parm to PARM_BOUNDARY. The | |
4627 | initial offset is not affected by this rounding, while the size always | |
4628 | is and the starting offset may be. */ | |
4629 | ||
4630 | /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case; | |
4631 | initial_offset_ptr is positive because locate_and_pad_parm's | |
4632 | callers pass in the total size of args so far as | |
4633 | initial_offset_ptr. arg_size_ptr is always positive.*/ | |
4634 | ||
6f086dfc RS |
4635 | void |
4636 | locate_and_pad_parm (passed_mode, type, in_regs, fndecl, | |
4637 | initial_offset_ptr, offset_ptr, arg_size_ptr) | |
4638 | enum machine_mode passed_mode; | |
4639 | tree type; | |
4640 | int in_regs; | |
4641 | tree fndecl; | |
4642 | struct args_size *initial_offset_ptr; | |
4643 | struct args_size *offset_ptr; | |
4644 | struct args_size *arg_size_ptr; | |
4645 | { | |
4646 | tree sizetree | |
4647 | = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode)); | |
4648 | enum direction where_pad = FUNCTION_ARG_PADDING (passed_mode, type); | |
4649 | int boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type); | |
6f086dfc RS |
4650 | |
4651 | #ifdef REG_PARM_STACK_SPACE | |
4652 | /* If we have found a stack parm before we reach the end of the | |
4653 | area reserved for registers, skip that area. */ | |
4654 | if (! in_regs) | |
4655 | { | |
29a82058 JL |
4656 | int reg_parm_stack_space = 0; |
4657 | ||
29008b51 JW |
4658 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
4659 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
4660 | #else | |
6f086dfc | 4661 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
29008b51 | 4662 | #endif |
6f086dfc RS |
4663 | if (reg_parm_stack_space > 0) |
4664 | { | |
4665 | if (initial_offset_ptr->var) | |
4666 | { | |
4667 | initial_offset_ptr->var | |
4668 | = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr), | |
4669 | size_int (reg_parm_stack_space)); | |
4670 | initial_offset_ptr->constant = 0; | |
4671 | } | |
4672 | else if (initial_offset_ptr->constant < reg_parm_stack_space) | |
4673 | initial_offset_ptr->constant = reg_parm_stack_space; | |
4674 | } | |
4675 | } | |
4676 | #endif /* REG_PARM_STACK_SPACE */ | |
4677 | ||
4678 | arg_size_ptr->var = 0; | |
4679 | arg_size_ptr->constant = 0; | |
4680 | ||
4681 | #ifdef ARGS_GROW_DOWNWARD | |
4682 | if (initial_offset_ptr->var) | |
4683 | { | |
4684 | offset_ptr->constant = 0; | |
4685 | offset_ptr->var = size_binop (MINUS_EXPR, integer_zero_node, | |
4686 | initial_offset_ptr->var); | |
4687 | } | |
4688 | else | |
4689 | { | |
4690 | offset_ptr->constant = - initial_offset_ptr->constant; | |
4691 | offset_ptr->var = 0; | |
4692 | } | |
0b21dcf5 | 4693 | if (where_pad != none |
6f086dfc RS |
4694 | && (TREE_CODE (sizetree) != INTEGER_CST |
4695 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
4696 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
4697 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
66bcbe19 TG |
4698 | if (where_pad != downward) |
4699 | pad_to_arg_alignment (offset_ptr, boundary); | |
6f086dfc RS |
4700 | if (initial_offset_ptr->var) |
4701 | { | |
4702 | arg_size_ptr->var = size_binop (MINUS_EXPR, | |
4703 | size_binop (MINUS_EXPR, | |
4704 | integer_zero_node, | |
4705 | initial_offset_ptr->var), | |
4706 | offset_ptr->var); | |
4707 | } | |
4708 | else | |
4709 | { | |
db3cf6fb MS |
4710 | arg_size_ptr->constant = (- initial_offset_ptr->constant |
4711 | - offset_ptr->constant); | |
6f086dfc | 4712 | } |
6f086dfc RS |
4713 | #else /* !ARGS_GROW_DOWNWARD */ |
4714 | pad_to_arg_alignment (initial_offset_ptr, boundary); | |
4715 | *offset_ptr = *initial_offset_ptr; | |
6f086dfc RS |
4716 | |
4717 | #ifdef PUSH_ROUNDING | |
4718 | if (passed_mode != BLKmode) | |
4719 | sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree))); | |
4720 | #endif | |
4721 | ||
d4b0a7a0 DE |
4722 | /* Pad_below needs the pre-rounded size to know how much to pad below |
4723 | so this must be done before rounding up. */ | |
ea5917da DE |
4724 | if (where_pad == downward |
4725 | /* However, BLKmode args passed in regs have their padding done elsewhere. | |
4726 | The stack slot must be able to hold the entire register. */ | |
4727 | && !(in_regs && passed_mode == BLKmode)) | |
d4b0a7a0 DE |
4728 | pad_below (offset_ptr, passed_mode, sizetree); |
4729 | ||
6f086dfc RS |
4730 | if (where_pad != none |
4731 | && (TREE_CODE (sizetree) != INTEGER_CST | |
4732 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
4733 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
4734 | ||
4735 | ADD_PARM_SIZE (*arg_size_ptr, sizetree); | |
4736 | #endif /* ARGS_GROW_DOWNWARD */ | |
4737 | } | |
4738 | ||
e16c591a RS |
4739 | /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY. |
4740 | BOUNDARY is measured in bits, but must be a multiple of a storage unit. */ | |
4741 | ||
6f086dfc RS |
4742 | static void |
4743 | pad_to_arg_alignment (offset_ptr, boundary) | |
4744 | struct args_size *offset_ptr; | |
4745 | int boundary; | |
4746 | { | |
4747 | int boundary_in_bytes = boundary / BITS_PER_UNIT; | |
4748 | ||
4749 | if (boundary > BITS_PER_UNIT) | |
4750 | { | |
4751 | if (offset_ptr->var) | |
4752 | { | |
4753 | offset_ptr->var = | |
4754 | #ifdef ARGS_GROW_DOWNWARD | |
4755 | round_down | |
4756 | #else | |
4757 | round_up | |
4758 | #endif | |
4759 | (ARGS_SIZE_TREE (*offset_ptr), | |
4760 | boundary / BITS_PER_UNIT); | |
4761 | offset_ptr->constant = 0; /*?*/ | |
4762 | } | |
4763 | else | |
4764 | offset_ptr->constant = | |
4765 | #ifdef ARGS_GROW_DOWNWARD | |
4766 | FLOOR_ROUND (offset_ptr->constant, boundary_in_bytes); | |
4767 | #else | |
4768 | CEIL_ROUND (offset_ptr->constant, boundary_in_bytes); | |
4769 | #endif | |
4770 | } | |
4771 | } | |
4772 | ||
51723711 | 4773 | #ifndef ARGS_GROW_DOWNWARD |
6f086dfc RS |
4774 | static void |
4775 | pad_below (offset_ptr, passed_mode, sizetree) | |
4776 | struct args_size *offset_ptr; | |
4777 | enum machine_mode passed_mode; | |
4778 | tree sizetree; | |
4779 | { | |
4780 | if (passed_mode != BLKmode) | |
4781 | { | |
4782 | if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY) | |
4783 | offset_ptr->constant | |
4784 | += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1) | |
4785 | / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT) | |
4786 | - GET_MODE_SIZE (passed_mode)); | |
4787 | } | |
4788 | else | |
4789 | { | |
4790 | if (TREE_CODE (sizetree) != INTEGER_CST | |
4791 | || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY) | |
4792 | { | |
4793 | /* Round the size up to multiple of PARM_BOUNDARY bits. */ | |
4794 | tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
4795 | /* Add it in. */ | |
4796 | ADD_PARM_SIZE (*offset_ptr, s2); | |
4797 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
4798 | } | |
4799 | } | |
4800 | } | |
51723711 | 4801 | #endif |
6f086dfc | 4802 | |
487a6e06 | 4803 | #ifdef ARGS_GROW_DOWNWARD |
6f086dfc RS |
4804 | static tree |
4805 | round_down (value, divisor) | |
4806 | tree value; | |
4807 | int divisor; | |
4808 | { | |
4809 | return size_binop (MULT_EXPR, | |
4810 | size_binop (FLOOR_DIV_EXPR, value, size_int (divisor)), | |
4811 | size_int (divisor)); | |
4812 | } | |
487a6e06 | 4813 | #endif |
6f086dfc RS |
4814 | \f |
4815 | /* Walk the tree of blocks describing the binding levels within a function | |
4816 | and warn about uninitialized variables. | |
4817 | This is done after calling flow_analysis and before global_alloc | |
4818 | clobbers the pseudo-regs to hard regs. */ | |
4819 | ||
4820 | void | |
4821 | uninitialized_vars_warning (block) | |
4822 | tree block; | |
4823 | { | |
4824 | register tree decl, sub; | |
4825 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
4826 | { | |
4827 | if (TREE_CODE (decl) == VAR_DECL | |
4828 | /* These warnings are unreliable for and aggregates | |
4829 | because assigning the fields one by one can fail to convince | |
4830 | flow.c that the entire aggregate was initialized. | |
4831 | Unions are troublesome because members may be shorter. */ | |
05e3bdb9 | 4832 | && ! AGGREGATE_TYPE_P (TREE_TYPE (decl)) |
6f086dfc RS |
4833 | && DECL_RTL (decl) != 0 |
4834 | && GET_CODE (DECL_RTL (decl)) == REG | |
4835 | && regno_uninitialized (REGNO (DECL_RTL (decl)))) | |
4836 | warning_with_decl (decl, | |
3c8cd8bd | 4837 | "`%s' might be used uninitialized in this function"); |
6f086dfc RS |
4838 | if (TREE_CODE (decl) == VAR_DECL |
4839 | && DECL_RTL (decl) != 0 | |
4840 | && GET_CODE (DECL_RTL (decl)) == REG | |
4841 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
4842 | warning_with_decl (decl, | |
3c8cd8bd | 4843 | "variable `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
4844 | } |
4845 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
4846 | uninitialized_vars_warning (sub); | |
4847 | } | |
4848 | ||
4849 | /* Do the appropriate part of uninitialized_vars_warning | |
4850 | but for arguments instead of local variables. */ | |
4851 | ||
4852 | void | |
0cd6ef35 | 4853 | setjmp_args_warning () |
6f086dfc RS |
4854 | { |
4855 | register tree decl; | |
4856 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
4857 | decl; decl = TREE_CHAIN (decl)) | |
4858 | if (DECL_RTL (decl) != 0 | |
4859 | && GET_CODE (DECL_RTL (decl)) == REG | |
4860 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
3c8cd8bd | 4861 | warning_with_decl (decl, "argument `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
4862 | } |
4863 | ||
4864 | /* If this function call setjmp, put all vars into the stack | |
4865 | unless they were declared `register'. */ | |
4866 | ||
4867 | void | |
4868 | setjmp_protect (block) | |
4869 | tree block; | |
4870 | { | |
4871 | register tree decl, sub; | |
4872 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
4873 | if ((TREE_CODE (decl) == VAR_DECL | |
4874 | || TREE_CODE (decl) == PARM_DECL) | |
4875 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
4876 | && (GET_CODE (DECL_RTL (decl)) == REG |
4877 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
4878 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
b335c2cc | 4879 | /* If this variable came from an inline function, it must be |
9ec36da5 | 4880 | that its life doesn't overlap the setjmp. If there was a |
b335c2cc TW |
4881 | setjmp in the function, it would already be in memory. We |
4882 | must exclude such variable because their DECL_RTL might be | |
4883 | set to strange things such as virtual_stack_vars_rtx. */ | |
4884 | && ! DECL_FROM_INLINE (decl) | |
6f086dfc RS |
4885 | && ( |
4886 | #ifdef NON_SAVING_SETJMP | |
4887 | /* If longjmp doesn't restore the registers, | |
4888 | don't put anything in them. */ | |
4889 | NON_SAVING_SETJMP | |
4890 | || | |
4891 | #endif | |
a82ad570 | 4892 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
4893 | put_var_into_stack (decl); |
4894 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
4895 | setjmp_protect (sub); | |
4896 | } | |
4897 | \f | |
4898 | /* Like the previous function, but for args instead of local variables. */ | |
4899 | ||
4900 | void | |
4901 | setjmp_protect_args () | |
4902 | { | |
29a82058 | 4903 | register tree decl; |
6f086dfc RS |
4904 | for (decl = DECL_ARGUMENTS (current_function_decl); |
4905 | decl; decl = TREE_CHAIN (decl)) | |
4906 | if ((TREE_CODE (decl) == VAR_DECL | |
4907 | || TREE_CODE (decl) == PARM_DECL) | |
4908 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
4909 | && (GET_CODE (DECL_RTL (decl)) == REG |
4910 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
4911 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
6f086dfc RS |
4912 | && ( |
4913 | /* If longjmp doesn't restore the registers, | |
4914 | don't put anything in them. */ | |
4915 | #ifdef NON_SAVING_SETJMP | |
4916 | NON_SAVING_SETJMP | |
4917 | || | |
4918 | #endif | |
a82ad570 | 4919 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
4920 | put_var_into_stack (decl); |
4921 | } | |
4922 | \f | |
4923 | /* Return the context-pointer register corresponding to DECL, | |
4924 | or 0 if it does not need one. */ | |
4925 | ||
4926 | rtx | |
4927 | lookup_static_chain (decl) | |
4928 | tree decl; | |
4929 | { | |
b001a02f PB |
4930 | tree context = decl_function_context (decl); |
4931 | tree link; | |
7ad8c4bf | 4932 | |
38ee6ed9 JM |
4933 | if (context == 0 |
4934 | || (TREE_CODE (decl) == FUNCTION_DECL && DECL_NO_STATIC_CHAIN (decl))) | |
7ad8c4bf | 4935 | return 0; |
38ee6ed9 | 4936 | |
6f086dfc RS |
4937 | /* We treat inline_function_decl as an alias for the current function |
4938 | because that is the inline function whose vars, types, etc. | |
4939 | are being merged into the current function. | |
4940 | See expand_inline_function. */ | |
4941 | if (context == current_function_decl || context == inline_function_decl) | |
4942 | return virtual_stack_vars_rtx; | |
4943 | ||
4944 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
4945 | if (TREE_PURPOSE (link) == context) | |
4946 | return RTL_EXPR_RTL (TREE_VALUE (link)); | |
4947 | ||
4948 | abort (); | |
4949 | } | |
4950 | \f | |
4951 | /* Convert a stack slot address ADDR for variable VAR | |
4952 | (from a containing function) | |
4953 | into an address valid in this function (using a static chain). */ | |
4954 | ||
4955 | rtx | |
4956 | fix_lexical_addr (addr, var) | |
4957 | rtx addr; | |
4958 | tree var; | |
4959 | { | |
4960 | rtx basereg; | |
e5e809f4 | 4961 | HOST_WIDE_INT displacement; |
6f086dfc RS |
4962 | tree context = decl_function_context (var); |
4963 | struct function *fp; | |
4964 | rtx base = 0; | |
4965 | ||
4966 | /* If this is the present function, we need not do anything. */ | |
4967 | if (context == current_function_decl || context == inline_function_decl) | |
4968 | return addr; | |
4969 | ||
4970 | for (fp = outer_function_chain; fp; fp = fp->next) | |
4971 | if (fp->decl == context) | |
4972 | break; | |
4973 | ||
4974 | if (fp == 0) | |
4975 | abort (); | |
4976 | ||
e9a25f70 JL |
4977 | if (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == MEM) |
4978 | addr = XEXP (XEXP (addr, 0), 0); | |
4979 | ||
6f086dfc RS |
4980 | /* Decode given address as base reg plus displacement. */ |
4981 | if (GET_CODE (addr) == REG) | |
4982 | basereg = addr, displacement = 0; | |
4983 | else if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
4984 | basereg = XEXP (addr, 0), displacement = INTVAL (XEXP (addr, 1)); | |
4985 | else | |
4986 | abort (); | |
4987 | ||
4988 | /* We accept vars reached via the containing function's | |
4989 | incoming arg pointer and via its stack variables pointer. */ | |
4990 | if (basereg == fp->internal_arg_pointer) | |
4991 | { | |
4992 | /* If reached via arg pointer, get the arg pointer value | |
4993 | out of that function's stack frame. | |
4994 | ||
4995 | There are two cases: If a separate ap is needed, allocate a | |
4996 | slot in the outer function for it and dereference it that way. | |
4997 | This is correct even if the real ap is actually a pseudo. | |
4998 | Otherwise, just adjust the offset from the frame pointer to | |
4999 | compensate. */ | |
5000 | ||
5001 | #ifdef NEED_SEPARATE_AP | |
5002 | rtx addr; | |
5003 | ||
5004 | if (fp->arg_pointer_save_area == 0) | |
5005 | fp->arg_pointer_save_area | |
5006 | = assign_outer_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0, fp); | |
5007 | ||
5008 | addr = fix_lexical_addr (XEXP (fp->arg_pointer_save_area, 0), var); | |
5009 | addr = memory_address (Pmode, addr); | |
5010 | ||
38a448ca | 5011 | base = copy_to_reg (gen_rtx_MEM (Pmode, addr)); |
6f086dfc RS |
5012 | #else |
5013 | displacement += (FIRST_PARM_OFFSET (context) - STARTING_FRAME_OFFSET); | |
86f8eff3 | 5014 | base = lookup_static_chain (var); |
6f086dfc RS |
5015 | #endif |
5016 | } | |
5017 | ||
5018 | else if (basereg == virtual_stack_vars_rtx) | |
5019 | { | |
5020 | /* This is the same code as lookup_static_chain, duplicated here to | |
5021 | avoid an extra call to decl_function_context. */ | |
5022 | tree link; | |
5023 | ||
5024 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5025 | if (TREE_PURPOSE (link) == context) | |
5026 | { | |
5027 | base = RTL_EXPR_RTL (TREE_VALUE (link)); | |
5028 | break; | |
5029 | } | |
5030 | } | |
5031 | ||
5032 | if (base == 0) | |
5033 | abort (); | |
5034 | ||
5035 | /* Use same offset, relative to appropriate static chain or argument | |
5036 | pointer. */ | |
5037 | return plus_constant (base, displacement); | |
5038 | } | |
5039 | \f | |
5040 | /* Return the address of the trampoline for entering nested fn FUNCTION. | |
5041 | If necessary, allocate a trampoline (in the stack frame) | |
5042 | and emit rtl to initialize its contents (at entry to this function). */ | |
5043 | ||
5044 | rtx | |
5045 | trampoline_address (function) | |
5046 | tree function; | |
5047 | { | |
5048 | tree link; | |
5049 | tree rtlexp; | |
5050 | rtx tramp; | |
5051 | struct function *fp; | |
5052 | tree fn_context; | |
5053 | ||
5054 | /* Find an existing trampoline and return it. */ | |
5055 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
5056 | if (TREE_PURPOSE (link) == function) | |
e87ee2a9 RK |
5057 | return |
5058 | round_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0)); | |
5059 | ||
6f086dfc RS |
5060 | for (fp = outer_function_chain; fp; fp = fp->next) |
5061 | for (link = fp->trampoline_list; link; link = TREE_CHAIN (link)) | |
5062 | if (TREE_PURPOSE (link) == function) | |
5063 | { | |
5064 | tramp = fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0), | |
5065 | function); | |
5066 | return round_trampoline_addr (tramp); | |
5067 | } | |
5068 | ||
5069 | /* None exists; we must make one. */ | |
5070 | ||
5071 | /* Find the `struct function' for the function containing FUNCTION. */ | |
5072 | fp = 0; | |
5073 | fn_context = decl_function_context (function); | |
4ac74fb8 RK |
5074 | if (fn_context != current_function_decl |
5075 | && fn_context != inline_function_decl) | |
6f086dfc RS |
5076 | for (fp = outer_function_chain; fp; fp = fp->next) |
5077 | if (fp->decl == fn_context) | |
5078 | break; | |
5079 | ||
5080 | /* Allocate run-time space for this trampoline | |
5081 | (usually in the defining function's stack frame). */ | |
5082 | #ifdef ALLOCATE_TRAMPOLINE | |
5083 | tramp = ALLOCATE_TRAMPOLINE (fp); | |
5084 | #else | |
5085 | /* If rounding needed, allocate extra space | |
5086 | to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */ | |
5087 | #ifdef TRAMPOLINE_ALIGNMENT | |
b02ab63a RK |
5088 | #define TRAMPOLINE_REAL_SIZE \ |
5089 | (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1) | |
6f086dfc RS |
5090 | #else |
5091 | #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE) | |
5092 | #endif | |
5093 | if (fp != 0) | |
5094 | tramp = assign_outer_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0, fp); | |
5095 | else | |
5096 | tramp = assign_stack_local (BLKmode, TRAMPOLINE_REAL_SIZE, 0); | |
5097 | #endif | |
5098 | ||
5099 | /* Record the trampoline for reuse and note it for later initialization | |
5100 | by expand_function_end. */ | |
5101 | if (fp != 0) | |
5102 | { | |
28498644 RK |
5103 | push_obstacks (fp->function_maybepermanent_obstack, |
5104 | fp->function_maybepermanent_obstack); | |
6f086dfc RS |
5105 | rtlexp = make_node (RTL_EXPR); |
5106 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5107 | fp->trampoline_list = tree_cons (function, rtlexp, fp->trampoline_list); | |
5108 | pop_obstacks (); | |
5109 | } | |
5110 | else | |
5111 | { | |
5112 | /* Make the RTL_EXPR node temporary, not momentary, so that the | |
5113 | trampoline_list doesn't become garbage. */ | |
5114 | int momentary = suspend_momentary (); | |
5115 | rtlexp = make_node (RTL_EXPR); | |
5116 | resume_momentary (momentary); | |
5117 | ||
5118 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5119 | trampoline_list = tree_cons (function, rtlexp, trampoline_list); | |
5120 | } | |
5121 | ||
5122 | tramp = fix_lexical_addr (XEXP (tramp, 0), function); | |
5123 | return round_trampoline_addr (tramp); | |
5124 | } | |
5125 | ||
5126 | /* Given a trampoline address, | |
5127 | round it to multiple of TRAMPOLINE_ALIGNMENT. */ | |
5128 | ||
5129 | static rtx | |
5130 | round_trampoline_addr (tramp) | |
5131 | rtx tramp; | |
5132 | { | |
5133 | #ifdef TRAMPOLINE_ALIGNMENT | |
5134 | /* Round address up to desired boundary. */ | |
5135 | rtx temp = gen_reg_rtx (Pmode); | |
5136 | temp = expand_binop (Pmode, add_optab, tramp, | |
b02ab63a | 5137 | GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1), |
6f086dfc RS |
5138 | temp, 0, OPTAB_LIB_WIDEN); |
5139 | tramp = expand_binop (Pmode, and_optab, temp, | |
b02ab63a | 5140 | GEN_INT (- TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT), |
6f086dfc RS |
5141 | temp, 0, OPTAB_LIB_WIDEN); |
5142 | #endif | |
5143 | return tramp; | |
5144 | } | |
5145 | \f | |
467456d0 RS |
5146 | /* The functions identify_blocks and reorder_blocks provide a way to |
5147 | reorder the tree of BLOCK nodes, for optimizers that reshuffle or | |
5148 | duplicate portions of the RTL code. Call identify_blocks before | |
5149 | changing the RTL, and call reorder_blocks after. */ | |
5150 | ||
b2a59b15 MS |
5151 | /* Put all this function's BLOCK nodes including those that are chained |
5152 | onto the first block into a vector, and return it. | |
467456d0 RS |
5153 | Also store in each NOTE for the beginning or end of a block |
5154 | the index of that block in the vector. | |
b2a59b15 | 5155 | The arguments are BLOCK, the chain of top-level blocks of the function, |
467456d0 RS |
5156 | and INSNS, the insn chain of the function. */ |
5157 | ||
5158 | tree * | |
b2a59b15 MS |
5159 | identify_blocks (block, insns) |
5160 | tree block; | |
467456d0 RS |
5161 | rtx insns; |
5162 | { | |
fc289cd1 JW |
5163 | int n_blocks; |
5164 | tree *block_vector; | |
5165 | int *block_stack; | |
467456d0 | 5166 | int depth = 0; |
b2a59b15 MS |
5167 | int next_block_number = 1; |
5168 | int current_block_number = 1; | |
467456d0 RS |
5169 | rtx insn; |
5170 | ||
b2a59b15 | 5171 | if (block == 0) |
fc289cd1 JW |
5172 | return 0; |
5173 | ||
b2a59b15 | 5174 | n_blocks = all_blocks (block, 0); |
fc289cd1 JW |
5175 | block_vector = (tree *) xmalloc (n_blocks * sizeof (tree)); |
5176 | block_stack = (int *) alloca (n_blocks * sizeof (int)); | |
5177 | ||
b2a59b15 | 5178 | all_blocks (block, block_vector); |
467456d0 RS |
5179 | |
5180 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
5181 | if (GET_CODE (insn) == NOTE) | |
5182 | { | |
5183 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5184 | { | |
5185 | block_stack[depth++] = current_block_number; | |
5186 | current_block_number = next_block_number; | |
1b2ac438 | 5187 | NOTE_BLOCK_NUMBER (insn) = next_block_number++; |
467456d0 RS |
5188 | } |
5189 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5190 | { | |
1b2ac438 | 5191 | NOTE_BLOCK_NUMBER (insn) = current_block_number; |
c7fdfd49 | 5192 | current_block_number = block_stack[--depth]; |
467456d0 RS |
5193 | } |
5194 | } | |
5195 | ||
b2a59b15 MS |
5196 | if (n_blocks != next_block_number) |
5197 | abort (); | |
5198 | ||
467456d0 RS |
5199 | return block_vector; |
5200 | } | |
5201 | ||
5202 | /* Given BLOCK_VECTOR which was returned by identify_blocks, | |
5203 | and a revised instruction chain, rebuild the tree structure | |
5204 | of BLOCK nodes to correspond to the new order of RTL. | |
fc289cd1 | 5205 | The new block tree is inserted below TOP_BLOCK. |
467456d0 RS |
5206 | Returns the current top-level block. */ |
5207 | ||
5208 | tree | |
b2a59b15 | 5209 | reorder_blocks (block_vector, block, insns) |
467456d0 | 5210 | tree *block_vector; |
b2a59b15 | 5211 | tree block; |
467456d0 RS |
5212 | rtx insns; |
5213 | { | |
b2a59b15 | 5214 | tree current_block = block; |
467456d0 RS |
5215 | rtx insn; |
5216 | ||
fc289cd1 | 5217 | if (block_vector == 0) |
b2a59b15 | 5218 | return block; |
fc289cd1 | 5219 | |
b2a59b15 | 5220 | /* Prune the old trees away, so that it doesn't get in the way. */ |
fc289cd1 | 5221 | BLOCK_SUBBLOCKS (current_block) = 0; |
b2a59b15 | 5222 | BLOCK_CHAIN (current_block) = 0; |
fc289cd1 | 5223 | |
467456d0 RS |
5224 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
5225 | if (GET_CODE (insn) == NOTE) | |
5226 | { | |
5227 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5228 | { | |
5229 | tree block = block_vector[NOTE_BLOCK_NUMBER (insn)]; | |
5230 | /* If we have seen this block before, copy it. */ | |
5231 | if (TREE_ASM_WRITTEN (block)) | |
5232 | block = copy_node (block); | |
fc289cd1 | 5233 | BLOCK_SUBBLOCKS (block) = 0; |
467456d0 RS |
5234 | TREE_ASM_WRITTEN (block) = 1; |
5235 | BLOCK_SUPERCONTEXT (block) = current_block; | |
5236 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block); | |
5237 | BLOCK_SUBBLOCKS (current_block) = block; | |
5238 | current_block = block; | |
1b2ac438 | 5239 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5240 | } |
5241 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5242 | { | |
5243 | BLOCK_SUBBLOCKS (current_block) | |
5244 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
5245 | current_block = BLOCK_SUPERCONTEXT (current_block); | |
1b2ac438 | 5246 | NOTE_SOURCE_FILE (insn) = 0; |
467456d0 RS |
5247 | } |
5248 | } | |
5249 | ||
b2a59b15 MS |
5250 | BLOCK_SUBBLOCKS (current_block) |
5251 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
467456d0 RS |
5252 | return current_block; |
5253 | } | |
5254 | ||
5255 | /* Reverse the order of elements in the chain T of blocks, | |
5256 | and return the new head of the chain (old last element). */ | |
5257 | ||
5258 | static tree | |
5259 | blocks_nreverse (t) | |
5260 | tree t; | |
5261 | { | |
5262 | register tree prev = 0, decl, next; | |
5263 | for (decl = t; decl; decl = next) | |
5264 | { | |
5265 | next = BLOCK_CHAIN (decl); | |
5266 | BLOCK_CHAIN (decl) = prev; | |
5267 | prev = decl; | |
5268 | } | |
5269 | return prev; | |
5270 | } | |
5271 | ||
b2a59b15 MS |
5272 | /* Count the subblocks of the list starting with BLOCK, and list them |
5273 | all into the vector VECTOR. Also clear TREE_ASM_WRITTEN in all | |
5274 | blocks. */ | |
467456d0 RS |
5275 | |
5276 | static int | |
5277 | all_blocks (block, vector) | |
5278 | tree block; | |
5279 | tree *vector; | |
5280 | { | |
b2a59b15 MS |
5281 | int n_blocks = 0; |
5282 | ||
5283 | while (block) | |
5284 | { | |
5285 | TREE_ASM_WRITTEN (block) = 0; | |
5286 | ||
5287 | /* Record this block. */ | |
5288 | if (vector) | |
5289 | vector[n_blocks] = block; | |
5290 | ||
5291 | ++n_blocks; | |
5292 | ||
5293 | /* Record the subblocks, and their subblocks... */ | |
5294 | n_blocks += all_blocks (BLOCK_SUBBLOCKS (block), | |
5295 | vector ? vector + n_blocks : 0); | |
5296 | block = BLOCK_CHAIN (block); | |
5297 | } | |
467456d0 RS |
5298 | |
5299 | return n_blocks; | |
5300 | } | |
5301 | \f | |
6f086dfc RS |
5302 | /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node) |
5303 | and initialize static variables for generating RTL for the statements | |
5304 | of the function. */ | |
5305 | ||
5306 | void | |
5307 | init_function_start (subr, filename, line) | |
5308 | tree subr; | |
5309 | char *filename; | |
5310 | int line; | |
5311 | { | |
6f086dfc RS |
5312 | init_stmt_for_function (); |
5313 | ||
5314 | cse_not_expected = ! optimize; | |
5315 | ||
5316 | /* Caller save not needed yet. */ | |
5317 | caller_save_needed = 0; | |
5318 | ||
5319 | /* No stack slots have been made yet. */ | |
5320 | stack_slot_list = 0; | |
5321 | ||
5322 | /* There is no stack slot for handling nonlocal gotos. */ | |
5323 | nonlocal_goto_handler_slot = 0; | |
5324 | nonlocal_goto_stack_level = 0; | |
5325 | ||
5326 | /* No labels have been declared for nonlocal use. */ | |
5327 | nonlocal_labels = 0; | |
5328 | ||
5329 | /* No function calls so far in this function. */ | |
5330 | function_call_count = 0; | |
5331 | ||
5332 | /* No parm regs have been allocated. | |
5333 | (This is important for output_inline_function.) */ | |
5334 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; | |
5335 | ||
5336 | /* Initialize the RTL mechanism. */ | |
5337 | init_emit (); | |
5338 | ||
5339 | /* Initialize the queue of pending postincrement and postdecrements, | |
5340 | and some other info in expr.c. */ | |
5341 | init_expr (); | |
5342 | ||
5343 | /* We haven't done register allocation yet. */ | |
5344 | reg_renumber = 0; | |
5345 | ||
5346 | init_const_rtx_hash_table (); | |
5347 | ||
a1d7ffe3 | 5348 | current_function_name = (*decl_printable_name) (subr, 2); |
6f086dfc RS |
5349 | |
5350 | /* Nonzero if this is a nested function that uses a static chain. */ | |
5351 | ||
5352 | current_function_needs_context | |
38ee6ed9 JM |
5353 | = (decl_function_context (current_function_decl) != 0 |
5354 | && ! DECL_NO_STATIC_CHAIN (current_function_decl)); | |
6f086dfc RS |
5355 | |
5356 | /* Set if a call to setjmp is seen. */ | |
5357 | current_function_calls_setjmp = 0; | |
5358 | ||
5359 | /* Set if a call to longjmp is seen. */ | |
5360 | current_function_calls_longjmp = 0; | |
5361 | ||
5362 | current_function_calls_alloca = 0; | |
5363 | current_function_has_nonlocal_label = 0; | |
8634413a | 5364 | current_function_has_nonlocal_goto = 0; |
6f086dfc | 5365 | current_function_contains_functions = 0; |
173cd503 | 5366 | current_function_is_thunk = 0; |
6f086dfc RS |
5367 | |
5368 | current_function_returns_pcc_struct = 0; | |
5369 | current_function_returns_struct = 0; | |
5370 | current_function_epilogue_delay_list = 0; | |
5371 | current_function_uses_const_pool = 0; | |
5372 | current_function_uses_pic_offset_table = 0; | |
aeb302bb | 5373 | current_function_cannot_inline = 0; |
6f086dfc RS |
5374 | |
5375 | /* We have not yet needed to make a label to jump to for tail-recursion. */ | |
5376 | tail_recursion_label = 0; | |
5377 | ||
5378 | /* We haven't had a need to make a save area for ap yet. */ | |
5379 | ||
5380 | arg_pointer_save_area = 0; | |
5381 | ||
5382 | /* No stack slots allocated yet. */ | |
5383 | frame_offset = 0; | |
5384 | ||
5385 | /* No SAVE_EXPRs in this function yet. */ | |
5386 | save_expr_regs = 0; | |
5387 | ||
5388 | /* No RTL_EXPRs in this function yet. */ | |
5389 | rtl_expr_chain = 0; | |
5390 | ||
bc0ebdf9 RK |
5391 | /* Set up to allocate temporaries. */ |
5392 | init_temp_slots (); | |
6f086dfc RS |
5393 | |
5394 | /* Within function body, compute a type's size as soon it is laid out. */ | |
5395 | immediate_size_expand++; | |
5396 | ||
d9a98e1a RK |
5397 | /* We haven't made any trampolines for this function yet. */ |
5398 | trampoline_list = 0; | |
5399 | ||
6f086dfc RS |
5400 | init_pending_stack_adjust (); |
5401 | inhibit_defer_pop = 0; | |
5402 | ||
5403 | current_function_outgoing_args_size = 0; | |
5404 | ||
6f086dfc | 5405 | /* Prevent ever trying to delete the first instruction of a function. |
b274104c PB |
5406 | Also tell final how to output a linenum before the function prologue. |
5407 | Note linenums could be missing, e.g. when compiling a Java .class file. */ | |
5408 | if (line > 0) | |
5409 | emit_line_note (filename, line); | |
6f086dfc RS |
5410 | |
5411 | /* Make sure first insn is a note even if we don't want linenums. | |
5412 | This makes sure the first insn will never be deleted. | |
5413 | Also, final expects a note to appear there. */ | |
5f4f0e22 | 5414 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5415 | |
5416 | /* Set flags used by final.c. */ | |
5417 | if (aggregate_value_p (DECL_RESULT (subr))) | |
5418 | { | |
5419 | #ifdef PCC_STATIC_STRUCT_RETURN | |
1b8297c1 | 5420 | current_function_returns_pcc_struct = 1; |
6f086dfc | 5421 | #endif |
1b8297c1 | 5422 | current_function_returns_struct = 1; |
6f086dfc RS |
5423 | } |
5424 | ||
5425 | /* Warn if this value is an aggregate type, | |
5426 | regardless of which calling convention we are using for it. */ | |
5427 | if (warn_aggregate_return | |
05e3bdb9 | 5428 | && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)))) |
6f086dfc RS |
5429 | warning ("function returns an aggregate"); |
5430 | ||
5431 | current_function_returns_pointer | |
8eda074c | 5432 | = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr))); |
6f086dfc RS |
5433 | |
5434 | /* Indicate that we need to distinguish between the return value of the | |
5435 | present function and the return value of a function being called. */ | |
5436 | rtx_equal_function_value_matters = 1; | |
5437 | ||
5438 | /* Indicate that we have not instantiated virtual registers yet. */ | |
5439 | virtuals_instantiated = 0; | |
5440 | ||
5441 | /* Indicate we have no need of a frame pointer yet. */ | |
5442 | frame_pointer_needed = 0; | |
5443 | ||
ebb904cb | 5444 | /* By default assume not varargs or stdarg. */ |
6f086dfc | 5445 | current_function_varargs = 0; |
ebb904cb | 5446 | current_function_stdarg = 0; |
6f086dfc RS |
5447 | } |
5448 | ||
5449 | /* Indicate that the current function uses extra args | |
5450 | not explicitly mentioned in the argument list in any fashion. */ | |
5451 | ||
5452 | void | |
5453 | mark_varargs () | |
5454 | { | |
5455 | current_function_varargs = 1; | |
5456 | } | |
5457 | ||
5458 | /* Expand a call to __main at the beginning of a possible main function. */ | |
5459 | ||
e2fd1d94 JM |
5460 | #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main) |
5461 | #undef HAS_INIT_SECTION | |
5462 | #define HAS_INIT_SECTION | |
5463 | #endif | |
5464 | ||
6f086dfc RS |
5465 | void |
5466 | expand_main_function () | |
5467 | { | |
e2fd1d94 | 5468 | #if !defined (HAS_INIT_SECTION) |
b93a436e JL |
5469 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, NAME__MAIN), 0, |
5470 | VOIDmode, 0); | |
e2fd1d94 | 5471 | #endif /* not HAS_INIT_SECTION */ |
6f086dfc RS |
5472 | } |
5473 | \f | |
c20bf1f3 JB |
5474 | extern struct obstack permanent_obstack; |
5475 | ||
6f086dfc RS |
5476 | /* Start the RTL for a new function, and set variables used for |
5477 | emitting RTL. | |
5478 | SUBR is the FUNCTION_DECL node. | |
5479 | PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with | |
5480 | the function's parameters, which must be run at any return statement. */ | |
5481 | ||
5482 | void | |
5483 | expand_function_start (subr, parms_have_cleanups) | |
5484 | tree subr; | |
5485 | int parms_have_cleanups; | |
5486 | { | |
5487 | register int i; | |
5488 | tree tem; | |
4e86caed | 5489 | rtx last_ptr = NULL_RTX; |
6f086dfc RS |
5490 | |
5491 | /* Make sure volatile mem refs aren't considered | |
5492 | valid operands of arithmetic insns. */ | |
5493 | init_recog_no_volatile (); | |
5494 | ||
07417085 KR |
5495 | current_function_instrument_entry_exit |
5496 | = (flag_instrument_function_entry_exit | |
5497 | && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr)); | |
5498 | ||
6f086dfc RS |
5499 | /* If function gets a static chain arg, store it in the stack frame. |
5500 | Do this first, so it gets the first stack slot offset. */ | |
5501 | if (current_function_needs_context) | |
3e2481e9 JW |
5502 | { |
5503 | last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
f0c51a1e | 5504 | |
f0c51a1e RK |
5505 | /* Delay copying static chain if it is not a register to avoid |
5506 | conflicts with regs used for parameters. */ | |
f95182a4 ILT |
5507 | if (! SMALL_REGISTER_CLASSES |
5508 | || GET_CODE (static_chain_incoming_rtx) == REG) | |
f0c51a1e | 5509 | emit_move_insn (last_ptr, static_chain_incoming_rtx); |
3e2481e9 | 5510 | } |
6f086dfc RS |
5511 | |
5512 | /* If the parameters of this function need cleaning up, get a label | |
5513 | for the beginning of the code which executes those cleanups. This must | |
5514 | be done before doing anything with return_label. */ | |
5515 | if (parms_have_cleanups) | |
5516 | cleanup_label = gen_label_rtx (); | |
5517 | else | |
5518 | cleanup_label = 0; | |
5519 | ||
5520 | /* Make the label for return statements to jump to, if this machine | |
5521 | does not have a one-instruction return and uses an epilogue, | |
5522 | or if it returns a structure, or if it has parm cleanups. */ | |
5523 | #ifdef HAVE_return | |
5524 | if (cleanup_label == 0 && HAVE_return | |
07417085 | 5525 | && ! current_function_instrument_entry_exit |
6f086dfc RS |
5526 | && ! current_function_returns_pcc_struct |
5527 | && ! (current_function_returns_struct && ! optimize)) | |
5528 | return_label = 0; | |
5529 | else | |
5530 | return_label = gen_label_rtx (); | |
5531 | #else | |
5532 | return_label = gen_label_rtx (); | |
5533 | #endif | |
5534 | ||
5535 | /* Initialize rtx used to return the value. */ | |
5536 | /* Do this before assign_parms so that we copy the struct value address | |
5537 | before any library calls that assign parms might generate. */ | |
5538 | ||
5539 | /* Decide whether to return the value in memory or in a register. */ | |
5540 | if (aggregate_value_p (DECL_RESULT (subr))) | |
5541 | { | |
5542 | /* Returning something that won't go in a register. */ | |
4acc00bf | 5543 | register rtx value_address = 0; |
6f086dfc RS |
5544 | |
5545 | #ifdef PCC_STATIC_STRUCT_RETURN | |
5546 | if (current_function_returns_pcc_struct) | |
5547 | { | |
5548 | int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr))); | |
5549 | value_address = assemble_static_space (size); | |
5550 | } | |
5551 | else | |
5552 | #endif | |
5553 | { | |
5554 | /* Expect to be passed the address of a place to store the value. | |
5555 | If it is passed as an argument, assign_parms will take care of | |
5556 | it. */ | |
5557 | if (struct_value_incoming_rtx) | |
5558 | { | |
5559 | value_address = gen_reg_rtx (Pmode); | |
5560 | emit_move_insn (value_address, struct_value_incoming_rtx); | |
5561 | } | |
5562 | } | |
5563 | if (value_address) | |
ccdecf58 RK |
5564 | { |
5565 | DECL_RTL (DECL_RESULT (subr)) | |
38a448ca | 5566 | = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address); |
ccdecf58 | 5567 | MEM_IN_STRUCT_P (DECL_RTL (DECL_RESULT (subr))) |
05e3bdb9 | 5568 | = AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr))); |
ccdecf58 | 5569 | } |
6f086dfc RS |
5570 | } |
5571 | else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode) | |
5572 | /* If return mode is void, this decl rtl should not be used. */ | |
5573 | DECL_RTL (DECL_RESULT (subr)) = 0; | |
07417085 | 5574 | else if (parms_have_cleanups || current_function_instrument_entry_exit) |
a53e14c0 RK |
5575 | { |
5576 | /* If function will end with cleanup code for parms, | |
5577 | compute the return values into a pseudo reg, | |
5578 | which we will copy into the true return register | |
5579 | after the cleanups are done. */ | |
5580 | ||
5581 | enum machine_mode mode = DECL_MODE (DECL_RESULT (subr)); | |
a5a52dbc | 5582 | |
a53e14c0 RK |
5583 | #ifdef PROMOTE_FUNCTION_RETURN |
5584 | tree type = TREE_TYPE (DECL_RESULT (subr)); | |
5585 | int unsignedp = TREE_UNSIGNED (type); | |
5586 | ||
a5a52dbc | 5587 | mode = promote_mode (type, mode, &unsignedp, 1); |
a53e14c0 RK |
5588 | #endif |
5589 | ||
5590 | DECL_RTL (DECL_RESULT (subr)) = gen_reg_rtx (mode); | |
5591 | } | |
6f086dfc RS |
5592 | else |
5593 | /* Scalar, returned in a register. */ | |
5594 | { | |
5595 | #ifdef FUNCTION_OUTGOING_VALUE | |
5596 | DECL_RTL (DECL_RESULT (subr)) | |
5597 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
5598 | #else | |
5599 | DECL_RTL (DECL_RESULT (subr)) | |
5600 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (subr)), subr); | |
5601 | #endif | |
5602 | ||
5603 | /* Mark this reg as the function's return value. */ | |
5604 | if (GET_CODE (DECL_RTL (DECL_RESULT (subr))) == REG) | |
5605 | { | |
5606 | REG_FUNCTION_VALUE_P (DECL_RTL (DECL_RESULT (subr))) = 1; | |
5607 | /* Needed because we may need to move this to memory | |
5608 | in case it's a named return value whose address is taken. */ | |
a82ad570 | 5609 | DECL_REGISTER (DECL_RESULT (subr)) = 1; |
6f086dfc RS |
5610 | } |
5611 | } | |
5612 | ||
5613 | /* Initialize rtx for parameters and local variables. | |
5614 | In some cases this requires emitting insns. */ | |
5615 | ||
5616 | assign_parms (subr, 0); | |
5617 | ||
f0c51a1e RK |
5618 | /* Copy the static chain now if it wasn't a register. The delay is to |
5619 | avoid conflicts with the parameter passing registers. */ | |
5620 | ||
f95182a4 | 5621 | if (SMALL_REGISTER_CLASSES && current_function_needs_context) |
f0c51a1e RK |
5622 | if (GET_CODE (static_chain_incoming_rtx) != REG) |
5623 | emit_move_insn (last_ptr, static_chain_incoming_rtx); | |
f0c51a1e | 5624 | |
6f086dfc RS |
5625 | /* The following was moved from init_function_start. |
5626 | The move is supposed to make sdb output more accurate. */ | |
5627 | /* Indicate the beginning of the function body, | |
5628 | as opposed to parm setup. */ | |
5f4f0e22 | 5629 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_BEG); |
6f086dfc RS |
5630 | |
5631 | /* If doing stupid allocation, mark parms as born here. */ | |
5632 | ||
5633 | if (GET_CODE (get_last_insn ()) != NOTE) | |
5f4f0e22 | 5634 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5635 | parm_birth_insn = get_last_insn (); |
5636 | ||
5637 | if (obey_regdecls) | |
5638 | { | |
5639 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
5640 | use_variable (regno_reg_rtx[i]); | |
5641 | ||
5642 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
5643 | use_variable (current_function_internal_arg_pointer); | |
5644 | } | |
5645 | ||
6d7306f7 JM |
5646 | context_display = 0; |
5647 | if (current_function_needs_context) | |
ac9e20f0 | 5648 | { |
6d7306f7 JM |
5649 | /* Fetch static chain values for containing functions. */ |
5650 | tem = decl_function_context (current_function_decl); | |
5651 | /* If not doing stupid register allocation copy the static chain | |
5652 | pointer into a pseudo. If we have small register classes, copy | |
5653 | the value from memory if static_chain_incoming_rtx is a REG. If | |
5654 | we do stupid register allocation, we use the stack address | |
5655 | generated above. */ | |
5656 | if (tem && ! obey_regdecls) | |
5657 | { | |
6d7306f7 JM |
5658 | /* If the static chain originally came in a register, put it back |
5659 | there, then move it out in the next insn. The reason for | |
5660 | this peculiar code is to satisfy function integration. */ | |
f95182a4 ILT |
5661 | if (SMALL_REGISTER_CLASSES |
5662 | && GET_CODE (static_chain_incoming_rtx) == REG) | |
6d7306f7 | 5663 | emit_move_insn (static_chain_incoming_rtx, last_ptr); |
6d7306f7 JM |
5664 | last_ptr = copy_to_reg (static_chain_incoming_rtx); |
5665 | } | |
ac9e20f0 | 5666 | |
6d7306f7 JM |
5667 | while (tem) |
5668 | { | |
5669 | tree rtlexp = make_node (RTL_EXPR); | |
6f086dfc | 5670 | |
6d7306f7 JM |
5671 | RTL_EXPR_RTL (rtlexp) = last_ptr; |
5672 | context_display = tree_cons (tem, rtlexp, context_display); | |
5673 | tem = decl_function_context (tem); | |
5674 | if (tem == 0) | |
5675 | break; | |
5676 | /* Chain thru stack frames, assuming pointer to next lexical frame | |
5677 | is found at the place we always store it. */ | |
6f086dfc | 5678 | #ifdef FRAME_GROWS_DOWNWARD |
6d7306f7 | 5679 | last_ptr = plus_constant (last_ptr, - GET_MODE_SIZE (Pmode)); |
6f086dfc | 5680 | #endif |
38a448ca RH |
5681 | last_ptr = copy_to_reg (gen_rtx_MEM (Pmode, |
5682 | memory_address (Pmode, last_ptr))); | |
6d7306f7 JM |
5683 | |
5684 | /* If we are not optimizing, ensure that we know that this | |
5685 | piece of context is live over the entire function. */ | |
5686 | if (! optimize) | |
38a448ca RH |
5687 | save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, last_ptr, |
5688 | save_expr_regs); | |
6d7306f7 | 5689 | } |
6f086dfc RS |
5690 | } |
5691 | ||
07417085 KR |
5692 | if (current_function_instrument_entry_exit) |
5693 | { | |
5694 | rtx fun = DECL_RTL (current_function_decl); | |
5695 | if (GET_CODE (fun) == MEM) | |
5696 | fun = XEXP (fun, 0); | |
5697 | else | |
5698 | abort (); | |
5699 | emit_library_call (profile_function_entry_libfunc, 0, VOIDmode, 2, | |
5700 | fun, Pmode, | |
5701 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
5702 | 0, | |
5703 | hard_frame_pointer_rtx), | |
5704 | Pmode); | |
5705 | } | |
5706 | ||
6f086dfc RS |
5707 | /* After the display initializations is where the tail-recursion label |
5708 | should go, if we end up needing one. Ensure we have a NOTE here | |
5709 | since some things (like trampolines) get placed before this. */ | |
5f4f0e22 | 5710 | tail_recursion_reentry = emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
5711 | |
5712 | /* Evaluate now the sizes of any types declared among the arguments. */ | |
5713 | for (tem = nreverse (get_pending_sizes ()); tem; tem = TREE_CHAIN (tem)) | |
7b05e286 | 5714 | { |
86fa911a RK |
5715 | expand_expr (TREE_VALUE (tem), const0_rtx, VOIDmode, |
5716 | EXPAND_MEMORY_USE_BAD); | |
7b05e286 JW |
5717 | /* Flush the queue in case this parameter declaration has |
5718 | side-effects. */ | |
5719 | emit_queue (); | |
5720 | } | |
6f086dfc RS |
5721 | |
5722 | /* Make sure there is a line number after the function entry setup code. */ | |
5723 | force_next_line_note (); | |
5724 | } | |
5725 | \f | |
5726 | /* Generate RTL for the end of the current function. | |
980697fd | 5727 | FILENAME and LINE are the current position in the source file. |
6f086dfc | 5728 | |
980697fd | 5729 | It is up to language-specific callers to do cleanups for parameters-- |
1be07046 | 5730 | or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */ |
6f086dfc RS |
5731 | |
5732 | void | |
1be07046 | 5733 | expand_function_end (filename, line, end_bindings) |
6f086dfc RS |
5734 | char *filename; |
5735 | int line; | |
1be07046 | 5736 | int end_bindings; |
6f086dfc RS |
5737 | { |
5738 | register int i; | |
5739 | tree link; | |
5740 | ||
1e2414db | 5741 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc | 5742 | static rtx initial_trampoline; |
1e2414db | 5743 | #endif |
6f086dfc RS |
5744 | |
5745 | #ifdef NON_SAVING_SETJMP | |
5746 | /* Don't put any variables in registers if we call setjmp | |
5747 | on a machine that fails to restore the registers. */ | |
5748 | if (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
5749 | { | |
b88a3142 RK |
5750 | if (DECL_INITIAL (current_function_decl) != error_mark_node) |
5751 | setjmp_protect (DECL_INITIAL (current_function_decl)); | |
5752 | ||
6f086dfc RS |
5753 | setjmp_protect_args (); |
5754 | } | |
5755 | #endif | |
5756 | ||
5757 | /* Save the argument pointer if a save area was made for it. */ | |
5758 | if (arg_pointer_save_area) | |
5759 | { | |
5760 | rtx x = gen_move_insn (arg_pointer_save_area, virtual_incoming_args_rtx); | |
5761 | emit_insn_before (x, tail_recursion_reentry); | |
5762 | } | |
5763 | ||
5764 | /* Initialize any trampolines required by this function. */ | |
5765 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
5766 | { | |
5767 | tree function = TREE_PURPOSE (link); | |
5768 | rtx context = lookup_static_chain (function); | |
5769 | rtx tramp = RTL_EXPR_RTL (TREE_VALUE (link)); | |
7a87758d | 5770 | #ifdef TRAMPOLINE_TEMPLATE |
1e2414db | 5771 | rtx blktramp; |
7a87758d | 5772 | #endif |
6f086dfc RS |
5773 | rtx seq; |
5774 | ||
1e2414db | 5775 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc RS |
5776 | /* First make sure this compilation has a template for |
5777 | initializing trampolines. */ | |
5778 | if (initial_trampoline == 0) | |
86f8eff3 RK |
5779 | { |
5780 | end_temporary_allocation (); | |
5781 | initial_trampoline | |
38a448ca | 5782 | = gen_rtx_MEM (BLKmode, assemble_trampoline_template ()); |
86f8eff3 RK |
5783 | resume_temporary_allocation (); |
5784 | } | |
1e2414db | 5785 | #endif |
6f086dfc RS |
5786 | |
5787 | /* Generate insns to initialize the trampoline. */ | |
5788 | start_sequence (); | |
1e2414db RK |
5789 | tramp = round_trampoline_addr (XEXP (tramp, 0)); |
5790 | #ifdef TRAMPOLINE_TEMPLATE | |
5791 | blktramp = change_address (initial_trampoline, BLKmode, tramp); | |
5792 | emit_block_move (blktramp, initial_trampoline, | |
5793 | GEN_INT (TRAMPOLINE_SIZE), | |
189cc377 | 5794 | TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT); |
1e2414db RK |
5795 | #endif |
5796 | INITIALIZE_TRAMPOLINE (tramp, XEXP (DECL_RTL (function), 0), context); | |
6f086dfc RS |
5797 | seq = get_insns (); |
5798 | end_sequence (); | |
5799 | ||
5800 | /* Put those insns at entry to the containing function (this one). */ | |
5801 | emit_insns_before (seq, tail_recursion_reentry); | |
5802 | } | |
6f086dfc | 5803 | |
11044f66 RK |
5804 | /* If we are doing stack checking and this function makes calls, |
5805 | do a stack probe at the start of the function to ensure we have enough | |
5806 | space for another stack frame. */ | |
5807 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
5808 | { | |
5809 | rtx insn, seq; | |
5810 | ||
5811 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
5812 | if (GET_CODE (insn) == CALL_INSN) | |
5813 | { | |
5814 | start_sequence (); | |
5815 | probe_stack_range (STACK_CHECK_PROTECT, | |
5816 | GEN_INT (STACK_CHECK_MAX_FRAME_SIZE)); | |
5817 | seq = get_insns (); | |
5818 | end_sequence (); | |
5819 | emit_insns_before (seq, tail_recursion_reentry); | |
5820 | break; | |
5821 | } | |
5822 | } | |
5823 | ||
db8717d9 RK |
5824 | /* Warn about unused parms if extra warnings were specified. */ |
5825 | if (warn_unused && extra_warnings) | |
6f086dfc | 5826 | { |
db8717d9 | 5827 | tree decl; |
6f086dfc RS |
5828 | |
5829 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
5830 | decl; decl = TREE_CHAIN (decl)) | |
497dc802 JM |
5831 | if (! TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL |
5832 | && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)) | |
6f086dfc RS |
5833 | warning_with_decl (decl, "unused parameter `%s'"); |
5834 | } | |
6f086dfc RS |
5835 | |
5836 | /* Delete handlers for nonlocal gotos if nothing uses them. */ | |
5837 | if (nonlocal_goto_handler_slot != 0 && !current_function_has_nonlocal_label) | |
5838 | delete_handlers (); | |
5839 | ||
5840 | /* End any sequences that failed to be closed due to syntax errors. */ | |
5841 | while (in_sequence_p ()) | |
5f4f0e22 | 5842 | end_sequence (); |
6f086dfc RS |
5843 | |
5844 | /* Outside function body, can't compute type's actual size | |
5845 | until next function's body starts. */ | |
5846 | immediate_size_expand--; | |
5847 | ||
5848 | /* If doing stupid register allocation, | |
5849 | mark register parms as dying here. */ | |
5850 | ||
5851 | if (obey_regdecls) | |
5852 | { | |
5853 | rtx tem; | |
5854 | for (i = LAST_VIRTUAL_REGISTER + 1; i < max_parm_reg; i++) | |
5855 | use_variable (regno_reg_rtx[i]); | |
5856 | ||
5857 | /* Likewise for the regs of all the SAVE_EXPRs in the function. */ | |
5858 | ||
5859 | for (tem = save_expr_regs; tem; tem = XEXP (tem, 1)) | |
5860 | { | |
5861 | use_variable (XEXP (tem, 0)); | |
5862 | use_variable_after (XEXP (tem, 0), parm_birth_insn); | |
5863 | } | |
5864 | ||
5865 | if (current_function_internal_arg_pointer != virtual_incoming_args_rtx) | |
5866 | use_variable (current_function_internal_arg_pointer); | |
5867 | } | |
5868 | ||
5869 | clear_pending_stack_adjust (); | |
5870 | do_pending_stack_adjust (); | |
5871 | ||
5872 | /* Mark the end of the function body. | |
5873 | If control reaches this insn, the function can drop through | |
5874 | without returning a value. */ | |
5f4f0e22 | 5875 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_END); |
6f086dfc | 5876 | |
82e415a3 DE |
5877 | /* Must mark the last line number note in the function, so that the test |
5878 | coverage code can avoid counting the last line twice. This just tells | |
5879 | the code to ignore the immediately following line note, since there | |
5880 | already exists a copy of this note somewhere above. This line number | |
5881 | note is still needed for debugging though, so we can't delete it. */ | |
5882 | if (flag_test_coverage) | |
5883 | emit_note (NULL_PTR, NOTE_REPEATED_LINE_NUMBER); | |
5884 | ||
6f086dfc RS |
5885 | /* Output a linenumber for the end of the function. |
5886 | SDB depends on this. */ | |
5887 | emit_line_note_force (filename, line); | |
5888 | ||
5889 | /* Output the label for the actual return from the function, | |
5890 | if one is expected. This happens either because a function epilogue | |
5891 | is used instead of a return instruction, or because a return was done | |
5892 | with a goto in order to run local cleanups, or because of pcc-style | |
5893 | structure returning. */ | |
5894 | ||
5895 | if (return_label) | |
5896 | emit_label (return_label); | |
5897 | ||
1be07046 RS |
5898 | /* C++ uses this. */ |
5899 | if (end_bindings) | |
5900 | expand_end_bindings (0, 0, 0); | |
5901 | ||
e5a1e0e8 MS |
5902 | /* Now handle any leftover exception regions that may have been |
5903 | created for the parameters. */ | |
5904 | { | |
5905 | rtx last = get_last_insn (); | |
5906 | rtx label; | |
5907 | ||
5908 | expand_leftover_cleanups (); | |
5909 | ||
5910 | /* If the above emitted any code, may sure we jump around it. */ | |
5911 | if (last != get_last_insn ()) | |
5912 | { | |
5913 | label = gen_label_rtx (); | |
5914 | last = emit_jump_insn_after (gen_jump (label), last); | |
5915 | last = emit_barrier_after (last); | |
5916 | emit_label (label); | |
5917 | } | |
5918 | } | |
5919 | ||
07417085 KR |
5920 | if (current_function_instrument_entry_exit) |
5921 | { | |
5922 | rtx fun = DECL_RTL (current_function_decl); | |
5923 | if (GET_CODE (fun) == MEM) | |
5924 | fun = XEXP (fun, 0); | |
5925 | else | |
5926 | abort (); | |
5927 | emit_library_call (profile_function_exit_libfunc, 0, VOIDmode, 2, | |
5928 | fun, Pmode, | |
5929 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
5930 | 0, | |
5931 | hard_frame_pointer_rtx), | |
5932 | Pmode); | |
5933 | } | |
5934 | ||
6f086dfc RS |
5935 | /* If we had calls to alloca, and this machine needs |
5936 | an accurate stack pointer to exit the function, | |
5937 | insert some code to save and restore the stack pointer. */ | |
5938 | #ifdef EXIT_IGNORE_STACK | |
5939 | if (! EXIT_IGNORE_STACK) | |
5940 | #endif | |
5941 | if (current_function_calls_alloca) | |
5942 | { | |
59257ff7 RK |
5943 | rtx tem = 0; |
5944 | ||
5945 | emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn); | |
5f4f0e22 | 5946 | emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX); |
6f086dfc RS |
5947 | } |
5948 | ||
5949 | /* If scalar return value was computed in a pseudo-reg, | |
5950 | copy that to the hard return register. */ | |
5951 | if (DECL_RTL (DECL_RESULT (current_function_decl)) != 0 | |
5952 | && GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) == REG | |
5953 | && (REGNO (DECL_RTL (DECL_RESULT (current_function_decl))) | |
5954 | >= FIRST_PSEUDO_REGISTER)) | |
5955 | { | |
5956 | rtx real_decl_result; | |
5957 | ||
5958 | #ifdef FUNCTION_OUTGOING_VALUE | |
5959 | real_decl_result | |
5960 | = FUNCTION_OUTGOING_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
5961 | current_function_decl); | |
5962 | #else | |
5963 | real_decl_result | |
5964 | = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (current_function_decl)), | |
5965 | current_function_decl); | |
5966 | #endif | |
5967 | REG_FUNCTION_VALUE_P (real_decl_result) = 1; | |
ecec4441 JW |
5968 | /* If this is a BLKmode structure being returned in registers, then use |
5969 | the mode computed in expand_return. */ | |
5970 | if (GET_MODE (real_decl_result) == BLKmode) | |
5971 | PUT_MODE (real_decl_result, | |
5972 | GET_MODE (DECL_RTL (DECL_RESULT (current_function_decl)))); | |
6f086dfc RS |
5973 | emit_move_insn (real_decl_result, |
5974 | DECL_RTL (DECL_RESULT (current_function_decl))); | |
38a448ca | 5975 | emit_insn (gen_rtx_USE (VOIDmode, real_decl_result)); |
f345de42 JL |
5976 | |
5977 | /* The delay slot scheduler assumes that current_function_return_rtx | |
5978 | holds the hard register containing the return value, not a temporary | |
5979 | pseudo. */ | |
5980 | current_function_return_rtx = real_decl_result; | |
6f086dfc RS |
5981 | } |
5982 | ||
5983 | /* If returning a structure, arrange to return the address of the value | |
5984 | in a place where debuggers expect to find it. | |
5985 | ||
5986 | If returning a structure PCC style, | |
5987 | the caller also depends on this value. | |
5988 | And current_function_returns_pcc_struct is not necessarily set. */ | |
5989 | if (current_function_returns_struct | |
5990 | || current_function_returns_pcc_struct) | |
5991 | { | |
5992 | rtx value_address = XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0); | |
5993 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); | |
5994 | #ifdef FUNCTION_OUTGOING_VALUE | |
5995 | rtx outgoing | |
5996 | = FUNCTION_OUTGOING_VALUE (build_pointer_type (type), | |
5997 | current_function_decl); | |
5998 | #else | |
5999 | rtx outgoing | |
6000 | = FUNCTION_VALUE (build_pointer_type (type), | |
6001 | current_function_decl); | |
6002 | #endif | |
6003 | ||
6004 | /* Mark this as a function return value so integrate will delete the | |
6005 | assignment and USE below when inlining this function. */ | |
6006 | REG_FUNCTION_VALUE_P (outgoing) = 1; | |
6007 | ||
6008 | emit_move_insn (outgoing, value_address); | |
6009 | use_variable (outgoing); | |
6010 | } | |
6011 | ||
71038426 RH |
6012 | /* If this is an implementation of __throw, do what's necessary to |
6013 | communicate between __builtin_eh_return and the epilogue. */ | |
6014 | expand_eh_return (); | |
6015 | ||
6f086dfc RS |
6016 | /* Output a return insn if we are using one. |
6017 | Otherwise, let the rtl chain end here, to drop through | |
6018 | into the epilogue. */ | |
6019 | ||
6020 | #ifdef HAVE_return | |
6021 | if (HAVE_return) | |
6022 | { | |
6023 | emit_jump_insn (gen_return ()); | |
6024 | emit_barrier (); | |
6025 | } | |
6026 | #endif | |
6027 | ||
6028 | /* Fix up any gotos that jumped out to the outermost | |
6029 | binding level of the function. | |
6030 | Must follow emitting RETURN_LABEL. */ | |
6031 | ||
6032 | /* If you have any cleanups to do at this point, | |
6033 | and they need to create temporary variables, | |
6034 | then you will lose. */ | |
e15679f8 | 6035 | expand_fixups (get_insns ()); |
6f086dfc | 6036 | } |
bdac5f58 TW |
6037 | \f |
6038 | /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */ | |
6039 | ||
6040 | static int *prologue; | |
6041 | static int *epilogue; | |
6042 | ||
6043 | /* Create an array that records the INSN_UIDs of INSNS (either a sequence | |
6044 | or a single insn). */ | |
6045 | ||
487a6e06 | 6046 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) |
bdac5f58 TW |
6047 | static int * |
6048 | record_insns (insns) | |
6049 | rtx insns; | |
6050 | { | |
6051 | int *vec; | |
6052 | ||
6053 | if (GET_CODE (insns) == SEQUENCE) | |
6054 | { | |
6055 | int len = XVECLEN (insns, 0); | |
6056 | vec = (int *) oballoc ((len + 1) * sizeof (int)); | |
6057 | vec[len] = 0; | |
6058 | while (--len >= 0) | |
6059 | vec[len] = INSN_UID (XVECEXP (insns, 0, len)); | |
6060 | } | |
6061 | else | |
6062 | { | |
6063 | vec = (int *) oballoc (2 * sizeof (int)); | |
6064 | vec[0] = INSN_UID (insns); | |
6065 | vec[1] = 0; | |
6066 | } | |
6067 | return vec; | |
6068 | } | |
6069 | ||
10914065 | 6070 | /* Determine how many INSN_UIDs in VEC are part of INSN. */ |
bdac5f58 | 6071 | |
10914065 | 6072 | static int |
bdac5f58 TW |
6073 | contains (insn, vec) |
6074 | rtx insn; | |
6075 | int *vec; | |
6076 | { | |
6077 | register int i, j; | |
6078 | ||
6079 | if (GET_CODE (insn) == INSN | |
6080 | && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
6081 | { | |
10914065 | 6082 | int count = 0; |
bdac5f58 TW |
6083 | for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--) |
6084 | for (j = 0; vec[j]; j++) | |
6085 | if (INSN_UID (XVECEXP (PATTERN (insn), 0, i)) == vec[j]) | |
10914065 TW |
6086 | count++; |
6087 | return count; | |
bdac5f58 TW |
6088 | } |
6089 | else | |
6090 | { | |
6091 | for (j = 0; vec[j]; j++) | |
6092 | if (INSN_UID (insn) == vec[j]) | |
10914065 | 6093 | return 1; |
bdac5f58 TW |
6094 | } |
6095 | return 0; | |
6096 | } | |
081f5e7e | 6097 | #endif /* HAVE_prologue || HAVE_epilogue */ |
bdac5f58 | 6098 | |
9faa82d8 | 6099 | /* Generate the prologue and epilogue RTL if the machine supports it. Thread |
bdac5f58 TW |
6100 | this into place with notes indicating where the prologue ends and where |
6101 | the epilogue begins. Update the basic block information when possible. */ | |
6102 | ||
6103 | void | |
6104 | thread_prologue_and_epilogue_insns (f) | |
6105 | rtx f; | |
6106 | { | |
6107 | #ifdef HAVE_prologue | |
6108 | if (HAVE_prologue) | |
6109 | { | |
29a82058 | 6110 | rtx head, seq; |
bdac5f58 TW |
6111 | |
6112 | /* The first insn (a NOTE_INSN_DELETED) is followed by zero or more | |
6113 | prologue insns and a NOTE_INSN_PROLOGUE_END. */ | |
6114 | emit_note_after (NOTE_INSN_PROLOGUE_END, f); | |
6115 | seq = gen_prologue (); | |
6116 | head = emit_insn_after (seq, f); | |
6117 | ||
6118 | /* Include the new prologue insns in the first block. Ignore them | |
6119 | if they form a basic block unto themselves. */ | |
6120 | if (basic_block_head && n_basic_blocks | |
6121 | && GET_CODE (basic_block_head[0]) != CODE_LABEL) | |
6122 | basic_block_head[0] = NEXT_INSN (f); | |
6123 | ||
6124 | /* Retain a map of the prologue insns. */ | |
6125 | prologue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : head); | |
6126 | } | |
6127 | else | |
6128 | #endif | |
6129 | prologue = 0; | |
6130 | ||
6131 | #ifdef HAVE_epilogue | |
6132 | if (HAVE_epilogue) | |
6133 | { | |
6134 | rtx insn = get_last_insn (); | |
6135 | rtx prev = prev_nonnote_insn (insn); | |
6136 | ||
6137 | /* If we end with a BARRIER, we don't need an epilogue. */ | |
6138 | if (! (prev && GET_CODE (prev) == BARRIER)) | |
6139 | { | |
a78bdb38 JW |
6140 | rtx tail, seq, tem; |
6141 | rtx first_use = 0; | |
6142 | rtx last_use = 0; | |
bdac5f58 | 6143 | |
a78bdb38 JW |
6144 | /* The last basic block ends with a NOTE_INSN_EPILOGUE_BEG, the |
6145 | epilogue insns, the USE insns at the end of a function, | |
6146 | the jump insn that returns, and then a BARRIER. */ | |
bdac5f58 | 6147 | |
a78bdb38 | 6148 | /* Move the USE insns at the end of a function onto a list. */ |
bdac5f58 TW |
6149 | while (prev |
6150 | && GET_CODE (prev) == INSN | |
6151 | && GET_CODE (PATTERN (prev)) == USE) | |
6152 | { | |
a78bdb38 | 6153 | tem = prev; |
bdac5f58 | 6154 | prev = prev_nonnote_insn (prev); |
a78bdb38 JW |
6155 | |
6156 | NEXT_INSN (PREV_INSN (tem)) = NEXT_INSN (tem); | |
6157 | PREV_INSN (NEXT_INSN (tem)) = PREV_INSN (tem); | |
83eb3b0d RK |
6158 | if (first_use) |
6159 | { | |
6160 | NEXT_INSN (tem) = first_use; | |
6161 | PREV_INSN (first_use) = tem; | |
6162 | } | |
6163 | first_use = tem; | |
6164 | if (!last_use) | |
a78bdb38 | 6165 | last_use = tem; |
bdac5f58 TW |
6166 | } |
6167 | ||
a78bdb38 JW |
6168 | emit_barrier_after (insn); |
6169 | ||
bdac5f58 TW |
6170 | seq = gen_epilogue (); |
6171 | tail = emit_jump_insn_after (seq, insn); | |
a78bdb38 JW |
6172 | |
6173 | /* Insert the USE insns immediately before the return insn, which | |
6174 | must be the first instruction before the final barrier. */ | |
6175 | if (first_use) | |
6176 | { | |
6177 | tem = prev_nonnote_insn (get_last_insn ()); | |
6178 | NEXT_INSN (PREV_INSN (tem)) = first_use; | |
6179 | PREV_INSN (first_use) = PREV_INSN (tem); | |
6180 | PREV_INSN (tem) = last_use; | |
6181 | NEXT_INSN (last_use) = tem; | |
6182 | } | |
6183 | ||
bdac5f58 TW |
6184 | emit_note_after (NOTE_INSN_EPILOGUE_BEG, insn); |
6185 | ||
6186 | /* Include the new epilogue insns in the last block. Ignore | |
6187 | them if they form a basic block unto themselves. */ | |
6188 | if (basic_block_end && n_basic_blocks | |
6189 | && GET_CODE (basic_block_end[n_basic_blocks - 1]) != JUMP_INSN) | |
6190 | basic_block_end[n_basic_blocks - 1] = tail; | |
6191 | ||
6192 | /* Retain a map of the epilogue insns. */ | |
6193 | epilogue = record_insns (GET_CODE (seq) == SEQUENCE ? seq : tail); | |
6194 | return; | |
6195 | } | |
6196 | } | |
6197 | #endif | |
6198 | epilogue = 0; | |
6199 | } | |
6200 | ||
6201 | /* Reposition the prologue-end and epilogue-begin notes after instruction | |
6202 | scheduling and delayed branch scheduling. */ | |
6203 | ||
6204 | void | |
6205 | reposition_prologue_and_epilogue_notes (f) | |
6206 | rtx f; | |
6207 | { | |
6208 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) | |
6209 | /* Reposition the prologue and epilogue notes. */ | |
6210 | if (n_basic_blocks) | |
6211 | { | |
6212 | rtx next, prev; | |
bf526252 | 6213 | int len; |
bdac5f58 TW |
6214 | |
6215 | if (prologue) | |
6216 | { | |
bf526252 RK |
6217 | register rtx insn, note = 0; |
6218 | ||
6219 | /* Scan from the beginning until we reach the last prologue insn. | |
6220 | We apparently can't depend on basic_block_{head,end} after | |
6221 | reorg has run. */ | |
6222 | for (len = 0; prologue[len]; len++) | |
6223 | ; | |
9392c110 JH |
6224 | for (insn = f; len && insn; insn = NEXT_INSN (insn)) |
6225 | { | |
6226 | if (GET_CODE (insn) == NOTE) | |
6227 | { | |
6228 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END) | |
6229 | note = insn; | |
6230 | } | |
6231 | else if ((len -= contains (insn, prologue)) == 0) | |
6232 | { | |
6233 | /* Find the prologue-end note if we haven't already, and | |
6234 | move it to just after the last prologue insn. */ | |
6235 | if (note == 0) | |
6236 | { | |
51723711 | 6237 | for (note = insn; (note = NEXT_INSN (note));) |
9392c110 JH |
6238 | if (GET_CODE (note) == NOTE |
6239 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END) | |
6240 | break; | |
6241 | } | |
c93b03c2 | 6242 | |
9392c110 JH |
6243 | next = NEXT_INSN (note); |
6244 | prev = PREV_INSN (note); | |
6245 | if (prev) | |
6246 | NEXT_INSN (prev) = next; | |
6247 | if (next) | |
6248 | PREV_INSN (next) = prev; | |
c93b03c2 RH |
6249 | |
6250 | /* Whether or not we can depend on basic_block_head, | |
6251 | attempt to keep it up-to-date. */ | |
6252 | if (basic_block_head[0] == note) | |
6253 | basic_block_head[0] = next; | |
6254 | ||
9392c110 JH |
6255 | add_insn_after (note, insn); |
6256 | } | |
6257 | } | |
bdac5f58 TW |
6258 | } |
6259 | ||
6260 | if (epilogue) | |
6261 | { | |
bf526252 RK |
6262 | register rtx insn, note = 0; |
6263 | ||
6264 | /* Scan from the end until we reach the first epilogue insn. | |
6265 | We apparently can't depend on basic_block_{head,end} after | |
6266 | reorg has run. */ | |
6267 | for (len = 0; epilogue[len]; len++) | |
6268 | ; | |
9392c110 JH |
6269 | for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn)) |
6270 | { | |
6271 | if (GET_CODE (insn) == NOTE) | |
6272 | { | |
6273 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG) | |
6274 | note = insn; | |
6275 | } | |
6276 | else if ((len -= contains (insn, epilogue)) == 0) | |
6277 | { | |
6278 | /* Find the epilogue-begin note if we haven't already, and | |
6279 | move it to just before the first epilogue insn. */ | |
6280 | if (note == 0) | |
6281 | { | |
51723711 | 6282 | for (note = insn; (note = PREV_INSN (note));) |
9392c110 JH |
6283 | if (GET_CODE (note) == NOTE |
6284 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG) | |
6285 | break; | |
6286 | } | |
6287 | next = NEXT_INSN (note); | |
6288 | prev = PREV_INSN (note); | |
6289 | if (prev) | |
6290 | NEXT_INSN (prev) = next; | |
6291 | if (next) | |
6292 | PREV_INSN (next) = prev; | |
c93b03c2 RH |
6293 | |
6294 | /* Whether or not we can depend on basic_block_head, | |
6295 | attempt to keep it up-to-date. */ | |
6296 | if (n_basic_blocks | |
6297 | && basic_block_head[n_basic_blocks-1] == insn) | |
6298 | basic_block_head[n_basic_blocks-1] = note; | |
6299 | ||
6300 | add_insn_before (note, insn); | |
9392c110 JH |
6301 | } |
6302 | } | |
bdac5f58 TW |
6303 | } |
6304 | } | |
6305 | #endif /* HAVE_prologue or HAVE_epilogue */ | |
6306 | } |