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51bbfa0c RS |
1 | /* Convert function calls to rtl insns, for GNU C compiler. |
2 | Copyright (C) 1989, 1992 Free Software Foundation, Inc. | |
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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "rtl.h" | |
22 | #include "tree.h" | |
23 | #include "flags.h" | |
24 | #include "expr.h" | |
322e3e34 | 25 | #include "gvarargs.h" |
51bbfa0c RS |
26 | #include "insn-flags.h" |
27 | ||
28 | /* Decide whether a function's arguments should be processed | |
bbc8a071 RK |
29 | from first to last or from last to first. |
30 | ||
31 | They should if the stack and args grow in opposite directions, but | |
32 | only if we have push insns. */ | |
51bbfa0c | 33 | |
51bbfa0c | 34 | #ifdef PUSH_ROUNDING |
bbc8a071 RK |
35 | |
36 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNARD) | |
51bbfa0c RS |
37 | #define PUSH_ARGS_REVERSED /* If it's last to first */ |
38 | #endif | |
bbc8a071 | 39 | |
51bbfa0c RS |
40 | #endif |
41 | ||
42 | /* Like STACK_BOUNDARY but in units of bytes, not bits. */ | |
43 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
44 | ||
45 | /* Data structure and subroutines used within expand_call. */ | |
46 | ||
47 | struct arg_data | |
48 | { | |
49 | /* Tree node for this argument. */ | |
50 | tree tree_value; | |
1efe6448 RK |
51 | /* Mode for value; TYPE_MODE unless promoted. */ |
52 | enum machine_mode mode; | |
51bbfa0c RS |
53 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
54 | rtx value; | |
55 | /* Initially-compute RTL value for argument; only for const functions. */ | |
56 | rtx initial_value; | |
57 | /* Register to pass this argument in, 0 if passed on stack, or an | |
58 | EXPR_LIST if the arg is to be copied into multiple different | |
59 | registers. */ | |
60 | rtx reg; | |
84b55618 RK |
61 | /* If REG was promoted from the actual mode of the argument expression, |
62 | indicates whether the promotion is sign- or zero-extended. */ | |
63 | int unsignedp; | |
51bbfa0c RS |
64 | /* Number of registers to use. 0 means put the whole arg in registers. |
65 | Also 0 if not passed in registers. */ | |
66 | int partial; | |
d64f5a78 RS |
67 | /* Non-zero if argument must be passed on stack. |
68 | Note that some arguments may be passed on the stack | |
69 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
70 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c RS |
71 | int pass_on_stack; |
72 | /* Offset of this argument from beginning of stack-args. */ | |
73 | struct args_size offset; | |
74 | /* Similar, but offset to the start of the stack slot. Different from | |
75 | OFFSET if this arg pads downward. */ | |
76 | struct args_size slot_offset; | |
77 | /* Size of this argument on the stack, rounded up for any padding it gets, | |
78 | parts of the argument passed in registers do not count. | |
79 | If REG_PARM_STACK_SPACE is defined, then register parms | |
80 | are counted here as well. */ | |
81 | struct args_size size; | |
82 | /* Location on the stack at which parameter should be stored. The store | |
83 | has already been done if STACK == VALUE. */ | |
84 | rtx stack; | |
85 | /* Location on the stack of the start of this argument slot. This can | |
86 | differ from STACK if this arg pads downward. This location is known | |
87 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
88 | rtx stack_slot; | |
89 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
90 | /* Place that this stack area has been saved, if needed. */ | |
91 | rtx save_area; | |
92 | #endif | |
4ab56118 RK |
93 | #ifdef STRICT_ALIGNMENT |
94 | /* If an argument's alignment does not permit direct copying into registers, | |
95 | copy in smaller-sized pieces into pseudos. These are stored in a | |
96 | block pointed to by this field. The next field says how many | |
97 | word-sized pseudos we made. */ | |
98 | rtx *aligned_regs; | |
99 | int n_aligned_regs; | |
100 | #endif | |
51bbfa0c RS |
101 | }; |
102 | ||
103 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
b94301c2 | 104 | /* A vector of one char per byte of stack space. A byte if non-zero if |
51bbfa0c RS |
105 | the corresponding stack location has been used. |
106 | This vector is used to prevent a function call within an argument from | |
107 | clobbering any stack already set up. */ | |
108 | static char *stack_usage_map; | |
109 | ||
110 | /* Size of STACK_USAGE_MAP. */ | |
111 | static int highest_outgoing_arg_in_use; | |
2f4aa534 RS |
112 | |
113 | /* stack_arg_under_construction is nonzero when an argument may be | |
114 | initialized with a constructor call (including a C function that | |
115 | returns a BLKmode struct) and expand_call must take special action | |
116 | to make sure the object being constructed does not overlap the | |
117 | argument list for the constructor call. */ | |
118 | int stack_arg_under_construction; | |
51bbfa0c RS |
119 | #endif |
120 | ||
322e3e34 | 121 | static int calls_function PROTO((tree, int)); |
322e3e34 RK |
122 | static void emit_call_1 PROTO((rtx, tree, int, int, rtx, rtx, int, |
123 | rtx, int)); | |
124 | static void store_one_arg PROTO ((struct arg_data *, rtx, int, int, | |
125 | tree, int)); | |
51bbfa0c | 126 | \f |
1ce0cb53 JW |
127 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
128 | `alloca'. | |
129 | ||
130 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
131 | Actually, we only need return 1 if evaluating EXP would require pushing | |
132 | arguments on the stack, but that is too difficult to compute, so we just | |
133 | assume any function call might require the stack. */ | |
51bbfa0c RS |
134 | |
135 | static int | |
1ce0cb53 | 136 | calls_function (exp, which) |
51bbfa0c | 137 | tree exp; |
1ce0cb53 | 138 | int which; |
51bbfa0c RS |
139 | { |
140 | register int i; | |
141 | int type = TREE_CODE_CLASS (TREE_CODE (exp)); | |
142 | int length = tree_code_length[(int) TREE_CODE (exp)]; | |
143 | ||
144 | /* Only expressions and references can contain calls. */ | |
145 | ||
3b59a331 RS |
146 | if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r' |
147 | && type != 'b') | |
51bbfa0c RS |
148 | return 0; |
149 | ||
150 | switch (TREE_CODE (exp)) | |
151 | { | |
152 | case CALL_EXPR: | |
1ce0cb53 JW |
153 | if (which == 0) |
154 | return 1; | |
155 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
156 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
157 | == FUNCTION_DECL) | |
158 | && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
159 | && (DECL_FUNCTION_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
160 | == BUILT_IN_ALLOCA)) | |
51bbfa0c RS |
161 | return 1; |
162 | ||
163 | /* Third operand is RTL. */ | |
164 | length = 2; | |
165 | break; | |
166 | ||
167 | case SAVE_EXPR: | |
168 | if (SAVE_EXPR_RTL (exp) != 0) | |
169 | return 0; | |
170 | break; | |
171 | ||
172 | case BLOCK: | |
ef03bc85 CH |
173 | { |
174 | register tree local; | |
175 | ||
176 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1ce0cb53 JW |
177 | if (DECL_INITIAL (local) != 0 |
178 | && calls_function (DECL_INITIAL (local), which)) | |
ef03bc85 CH |
179 | return 1; |
180 | } | |
181 | { | |
182 | register tree subblock; | |
183 | ||
184 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
185 | subblock; | |
186 | subblock = TREE_CHAIN (subblock)) | |
1ce0cb53 | 187 | if (calls_function (subblock, which)) |
ef03bc85 CH |
188 | return 1; |
189 | } | |
190 | return 0; | |
51bbfa0c RS |
191 | |
192 | case METHOD_CALL_EXPR: | |
193 | length = 3; | |
194 | break; | |
195 | ||
196 | case WITH_CLEANUP_EXPR: | |
197 | length = 1; | |
198 | break; | |
199 | ||
200 | case RTL_EXPR: | |
201 | return 0; | |
202 | } | |
203 | ||
204 | for (i = 0; i < length; i++) | |
205 | if (TREE_OPERAND (exp, i) != 0 | |
1ce0cb53 | 206 | && calls_function (TREE_OPERAND (exp, i), which)) |
51bbfa0c RS |
207 | return 1; |
208 | ||
209 | return 0; | |
210 | } | |
211 | \f | |
212 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
213 | and return that as an rtx. Also load the static chain register | |
214 | if FNDECL is a nested function. | |
215 | ||
216 | USE_INSNS points to a variable holding a chain of USE insns | |
217 | to which a USE of the static chain | |
218 | register should be added, if required. */ | |
219 | ||
03dacb02 | 220 | rtx |
51bbfa0c RS |
221 | prepare_call_address (funexp, fndecl, use_insns) |
222 | rtx funexp; | |
223 | tree fndecl; | |
224 | rtx *use_insns; | |
225 | { | |
226 | rtx static_chain_value = 0; | |
227 | ||
228 | funexp = protect_from_queue (funexp, 0); | |
229 | ||
230 | if (fndecl != 0) | |
231 | /* Get possible static chain value for nested function in C. */ | |
232 | static_chain_value = lookup_static_chain (fndecl); | |
233 | ||
234 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
235 | but not for a constant address if -fno-function-cse. */ | |
236 | if (GET_CODE (funexp) != SYMBOL_REF) | |
237 | funexp = memory_address (FUNCTION_MODE, funexp); | |
238 | else | |
239 | { | |
240 | #ifndef NO_FUNCTION_CSE | |
241 | if (optimize && ! flag_no_function_cse) | |
242 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
243 | if (fndecl != current_function_decl) | |
244 | #endif | |
245 | funexp = force_reg (Pmode, funexp); | |
246 | #endif | |
247 | } | |
248 | ||
249 | if (static_chain_value != 0) | |
250 | { | |
251 | emit_move_insn (static_chain_rtx, static_chain_value); | |
252 | ||
253 | /* Put the USE insn in the chain we were passed. It will later be | |
254 | output immediately in front of the CALL insn. */ | |
255 | push_to_sequence (*use_insns); | |
256 | emit_insn (gen_rtx (USE, VOIDmode, static_chain_rtx)); | |
257 | *use_insns = get_insns (); | |
258 | end_sequence (); | |
259 | } | |
260 | ||
261 | return funexp; | |
262 | } | |
263 | ||
264 | /* Generate instructions to call function FUNEXP, | |
265 | and optionally pop the results. | |
266 | The CALL_INSN is the first insn generated. | |
267 | ||
268 | FUNTYPE is the data type of the function, or, for a library call, | |
269 | the identifier for the name of the call. This is given to the | |
270 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. | |
271 | ||
272 | STACK_SIZE is the number of bytes of arguments on the stack, | |
273 | rounded up to STACK_BOUNDARY; zero if the size is variable. | |
274 | This is both to put into the call insn and | |
275 | to generate explicit popping code if necessary. | |
276 | ||
277 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
278 | It is zero if this call doesn't want a structure value. | |
279 | ||
280 | NEXT_ARG_REG is the rtx that results from executing | |
281 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
282 | just after all the args have had their registers assigned. | |
283 | This could be whatever you like, but normally it is the first | |
284 | arg-register beyond those used for args in this call, | |
285 | or 0 if all the arg-registers are used in this call. | |
286 | It is passed on to `gen_call' so you can put this info in the call insn. | |
287 | ||
288 | VALREG is a hard register in which a value is returned, | |
289 | or 0 if the call does not return a value. | |
290 | ||
291 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
292 | the args to this call were processed. | |
293 | We restore `inhibit_defer_pop' to that value. | |
294 | ||
295 | USE_INSNS is a chain of USE insns to be emitted immediately before | |
296 | the actual CALL insn. | |
297 | ||
298 | IS_CONST is true if this is a `const' call. */ | |
299 | ||
322e3e34 | 300 | static void |
51bbfa0c RS |
301 | emit_call_1 (funexp, funtype, stack_size, struct_value_size, next_arg_reg, |
302 | valreg, old_inhibit_defer_pop, use_insns, is_const) | |
303 | rtx funexp; | |
304 | tree funtype; | |
305 | int stack_size; | |
306 | int struct_value_size; | |
307 | rtx next_arg_reg; | |
308 | rtx valreg; | |
309 | int old_inhibit_defer_pop; | |
310 | rtx use_insns; | |
311 | int is_const; | |
312 | { | |
e5d70561 RK |
313 | rtx stack_size_rtx = GEN_INT (stack_size); |
314 | rtx struct_value_size_rtx = GEN_INT (struct_value_size); | |
51bbfa0c RS |
315 | rtx call_insn; |
316 | int already_popped = 0; | |
317 | ||
318 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
319 | and we don't want to load it into a register as an optimization, | |
320 | because prepare_call_address already did it if it should be done. */ | |
321 | if (GET_CODE (funexp) != SYMBOL_REF) | |
322 | funexp = memory_address (FUNCTION_MODE, funexp); | |
323 | ||
324 | #ifndef ACCUMULATE_OUTGOING_ARGS | |
325 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) | |
326 | if (HAVE_call_pop && HAVE_call_value_pop | |
327 | && (RETURN_POPS_ARGS (funtype, stack_size) > 0 || stack_size == 0)) | |
328 | { | |
e5d70561 | 329 | rtx n_pop = GEN_INT (RETURN_POPS_ARGS (funtype, stack_size)); |
51bbfa0c RS |
330 | rtx pat; |
331 | ||
332 | /* If this subroutine pops its own args, record that in the call insn | |
333 | if possible, for the sake of frame pointer elimination. */ | |
334 | if (valreg) | |
335 | pat = gen_call_value_pop (valreg, | |
336 | gen_rtx (MEM, FUNCTION_MODE, funexp), | |
337 | stack_size_rtx, next_arg_reg, n_pop); | |
338 | else | |
339 | pat = gen_call_pop (gen_rtx (MEM, FUNCTION_MODE, funexp), | |
340 | stack_size_rtx, next_arg_reg, n_pop); | |
341 | ||
342 | emit_call_insn (pat); | |
343 | already_popped = 1; | |
344 | } | |
345 | else | |
346 | #endif | |
347 | #endif | |
348 | ||
349 | #if defined (HAVE_call) && defined (HAVE_call_value) | |
350 | if (HAVE_call && HAVE_call_value) | |
351 | { | |
352 | if (valreg) | |
353 | emit_call_insn (gen_call_value (valreg, | |
354 | gen_rtx (MEM, FUNCTION_MODE, funexp), | |
e992302c BK |
355 | stack_size_rtx, next_arg_reg, |
356 | NULL_RTX)); | |
51bbfa0c RS |
357 | else |
358 | emit_call_insn (gen_call (gen_rtx (MEM, FUNCTION_MODE, funexp), | |
359 | stack_size_rtx, next_arg_reg, | |
360 | struct_value_size_rtx)); | |
361 | } | |
362 | else | |
363 | #endif | |
364 | abort (); | |
365 | ||
366 | /* Find the CALL insn we just emitted and write the USE insns before it. */ | |
367 | for (call_insn = get_last_insn (); | |
368 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
369 | call_insn = PREV_INSN (call_insn)) | |
370 | ; | |
371 | ||
372 | if (! call_insn) | |
373 | abort (); | |
374 | ||
375 | /* Put the USE insns before the CALL. */ | |
376 | emit_insns_before (use_insns, call_insn); | |
377 | ||
378 | /* If this is a const call, then set the insn's unchanging bit. */ | |
379 | if (is_const) | |
380 | CONST_CALL_P (call_insn) = 1; | |
381 | ||
b1e64e0d RS |
382 | /* Restore this now, so that we do defer pops for this call's args |
383 | if the context of the call as a whole permits. */ | |
384 | inhibit_defer_pop = old_inhibit_defer_pop; | |
385 | ||
51bbfa0c RS |
386 | #ifndef ACCUMULATE_OUTGOING_ARGS |
387 | /* If returning from the subroutine does not automatically pop the args, | |
388 | we need an instruction to pop them sooner or later. | |
389 | Perhaps do it now; perhaps just record how much space to pop later. | |
390 | ||
391 | If returning from the subroutine does pop the args, indicate that the | |
392 | stack pointer will be changed. */ | |
393 | ||
394 | if (stack_size != 0 && RETURN_POPS_ARGS (funtype, stack_size) > 0) | |
395 | { | |
396 | if (!already_popped) | |
397 | emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx)); | |
398 | stack_size -= RETURN_POPS_ARGS (funtype, stack_size); | |
e5d70561 | 399 | stack_size_rtx = GEN_INT (stack_size); |
51bbfa0c RS |
400 | } |
401 | ||
402 | if (stack_size != 0) | |
403 | { | |
70a73141 | 404 | if (flag_defer_pop && inhibit_defer_pop == 0 && !is_const) |
51bbfa0c RS |
405 | pending_stack_adjust += stack_size; |
406 | else | |
407 | adjust_stack (stack_size_rtx); | |
408 | } | |
409 | #endif | |
410 | } | |
411 | ||
412 | /* Generate all the code for a function call | |
413 | and return an rtx for its value. | |
414 | Store the value in TARGET (specified as an rtx) if convenient. | |
415 | If the value is stored in TARGET then TARGET is returned. | |
416 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
417 | ||
418 | rtx | |
8129842c | 419 | expand_call (exp, target, ignore) |
51bbfa0c RS |
420 | tree exp; |
421 | rtx target; | |
422 | int ignore; | |
51bbfa0c RS |
423 | { |
424 | /* List of actual parameters. */ | |
425 | tree actparms = TREE_OPERAND (exp, 1); | |
426 | /* RTX for the function to be called. */ | |
427 | rtx funexp; | |
428 | /* Tree node for the function to be called (not the address!). */ | |
429 | tree funtree; | |
430 | /* Data type of the function. */ | |
431 | tree funtype; | |
432 | /* Declaration of the function being called, | |
433 | or 0 if the function is computed (not known by name). */ | |
434 | tree fndecl = 0; | |
435 | char *name = 0; | |
436 | ||
437 | /* Register in which non-BLKmode value will be returned, | |
438 | or 0 if no value or if value is BLKmode. */ | |
439 | rtx valreg; | |
440 | /* Address where we should return a BLKmode value; | |
441 | 0 if value not BLKmode. */ | |
442 | rtx structure_value_addr = 0; | |
443 | /* Nonzero if that address is being passed by treating it as | |
444 | an extra, implicit first parameter. Otherwise, | |
445 | it is passed by being copied directly into struct_value_rtx. */ | |
446 | int structure_value_addr_parm = 0; | |
447 | /* Size of aggregate value wanted, or zero if none wanted | |
448 | or if we are using the non-reentrant PCC calling convention | |
449 | or expecting the value in registers. */ | |
450 | int struct_value_size = 0; | |
451 | /* Nonzero if called function returns an aggregate in memory PCC style, | |
452 | by returning the address of where to find it. */ | |
453 | int pcc_struct_value = 0; | |
454 | ||
455 | /* Number of actual parameters in this call, including struct value addr. */ | |
456 | int num_actuals; | |
457 | /* Number of named args. Args after this are anonymous ones | |
458 | and they must all go on the stack. */ | |
459 | int n_named_args; | |
460 | /* Count arg position in order args appear. */ | |
461 | int argpos; | |
462 | ||
463 | /* Vector of information about each argument. | |
464 | Arguments are numbered in the order they will be pushed, | |
465 | not the order they are written. */ | |
466 | struct arg_data *args; | |
467 | ||
468 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
469 | struct args_size args_size; | |
470 | /* Size of arguments before any adjustments (such as rounding). */ | |
471 | struct args_size original_args_size; | |
472 | /* Data on reg parms scanned so far. */ | |
473 | CUMULATIVE_ARGS args_so_far; | |
474 | /* Nonzero if a reg parm has been scanned. */ | |
475 | int reg_parm_seen; | |
efd65a8b RS |
476 | /* Nonzero if this is an indirect function call. */ |
477 | int current_call_is_indirect = 0; | |
51bbfa0c RS |
478 | |
479 | /* Nonzero if we must avoid push-insns in the args for this call. | |
480 | If stack space is allocated for register parameters, but not by the | |
481 | caller, then it is preallocated in the fixed part of the stack frame. | |
482 | So the entire argument block must then be preallocated (i.e., we | |
483 | ignore PUSH_ROUNDING in that case). */ | |
484 | ||
485 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
486 | int must_preallocate = 1; | |
487 | #else | |
488 | #ifdef PUSH_ROUNDING | |
489 | int must_preallocate = 0; | |
490 | #else | |
491 | int must_preallocate = 1; | |
492 | #endif | |
493 | #endif | |
494 | ||
f72aed24 | 495 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
496 | int reg_parm_stack_space = 0; |
497 | ||
51bbfa0c RS |
498 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ |
499 | int inc; | |
500 | /* Address of space preallocated for stack parms | |
501 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
502 | rtx argblock = 0; | |
503 | ||
504 | /* Nonzero if it is plausible that this is a call to alloca. */ | |
505 | int may_be_alloca; | |
506 | /* Nonzero if this is a call to setjmp or a related function. */ | |
507 | int returns_twice; | |
508 | /* Nonzero if this is a call to `longjmp'. */ | |
509 | int is_longjmp; | |
510 | /* Nonzero if this is a call to an inline function. */ | |
511 | int is_integrable = 0; | |
51bbfa0c RS |
512 | /* Nonzero if this is a call to a `const' function. |
513 | Note that only explicitly named functions are handled as `const' here. */ | |
514 | int is_const = 0; | |
515 | /* Nonzero if this is a call to a `volatile' function. */ | |
516 | int is_volatile = 0; | |
517 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) | |
518 | /* Define the boundary of the register parm stack space that needs to be | |
519 | save, if any. */ | |
520 | int low_to_save = -1, high_to_save; | |
521 | rtx save_area = 0; /* Place that it is saved */ | |
522 | #endif | |
523 | ||
524 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
525 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
526 | char *initial_stack_usage_map = stack_usage_map; | |
527 | #endif | |
528 | ||
529 | rtx old_stack_level = 0; | |
530 | int old_pending_adj; | |
2f4aa534 | 531 | int old_stack_arg_under_construction; |
51bbfa0c RS |
532 | int old_inhibit_defer_pop = inhibit_defer_pop; |
533 | tree old_cleanups = cleanups_this_call; | |
534 | ||
535 | rtx use_insns = 0; | |
536 | ||
537 | register tree p; | |
4ab56118 | 538 | register int i, j; |
51bbfa0c RS |
539 | |
540 | /* See if we can find a DECL-node for the actual function. | |
541 | As a result, decide whether this is a call to an integrable function. */ | |
542 | ||
543 | p = TREE_OPERAND (exp, 0); | |
544 | if (TREE_CODE (p) == ADDR_EXPR) | |
545 | { | |
546 | fndecl = TREE_OPERAND (p, 0); | |
547 | if (TREE_CODE (fndecl) != FUNCTION_DECL) | |
548 | { | |
549 | /* May still be a `const' function if it is | |
550 | a call through a pointer-to-const. | |
551 | But we don't handle that. */ | |
552 | fndecl = 0; | |
553 | } | |
554 | else | |
555 | { | |
556 | if (!flag_no_inline | |
557 | && fndecl != current_function_decl | |
558 | && DECL_SAVED_INSNS (fndecl)) | |
559 | is_integrable = 1; | |
560 | else if (! TREE_ADDRESSABLE (fndecl)) | |
561 | { | |
13d39dbc | 562 | /* In case this function later becomes inlinable, |
51bbfa0c RS |
563 | record that there was already a non-inline call to it. |
564 | ||
565 | Use abstraction instead of setting TREE_ADDRESSABLE | |
566 | directly. */ | |
67729b99 BK |
567 | if (DECL_INLINE (fndecl) && extra_warnings && warn_inline |
568 | && !flag_no_inline) | |
51bbfa0c RS |
569 | warning_with_decl (fndecl, "can't inline call to `%s' which was declared inline"); |
570 | mark_addressable (fndecl); | |
571 | } | |
572 | ||
d45cf215 RS |
573 | if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl) |
574 | && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode) | |
51bbfa0c RS |
575 | is_const = 1; |
576 | } | |
577 | } | |
578 | ||
579 | is_volatile = TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (p))); | |
580 | ||
6f90e075 JW |
581 | #ifdef REG_PARM_STACK_SPACE |
582 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
583 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
584 | #else | |
585 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
586 | #endif | |
587 | #endif | |
588 | ||
51bbfa0c RS |
589 | /* Warn if this value is an aggregate type, |
590 | regardless of which calling convention we are using for it. */ | |
591 | if (warn_aggregate_return | |
592 | && (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
593 | || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE | |
c1b98a95 | 594 | || TREE_CODE (TREE_TYPE (exp)) == QUAL_UNION_TYPE |
51bbfa0c RS |
595 | || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)) |
596 | warning ("function call has aggregate value"); | |
597 | ||
598 | /* Set up a place to return a structure. */ | |
599 | ||
600 | /* Cater to broken compilers. */ | |
601 | if (aggregate_value_p (exp)) | |
602 | { | |
603 | /* This call returns a big structure. */ | |
604 | is_const = 0; | |
605 | ||
606 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
607 | { |
608 | pcc_struct_value = 1; | |
609 | is_integrable = 0; /* Easier than making that case work right. */ | |
610 | } | |
611 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
612 | { | |
613 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 614 | |
9e7b1d0a RS |
615 | if (struct_value_size < 0) |
616 | abort (); | |
51bbfa0c | 617 | |
9e7b1d0a RS |
618 | if (target && GET_CODE (target) == MEM) |
619 | structure_value_addr = XEXP (target, 0); | |
620 | else | |
621 | { | |
622 | /* Assign a temporary on the stack to hold the value. */ | |
51bbfa0c | 623 | |
9e7b1d0a RS |
624 | /* For variable-sized objects, we must be called with a target |
625 | specified. If we were to allocate space on the stack here, | |
626 | we would have no way of knowing when to free it. */ | |
51bbfa0c | 627 | |
9e7b1d0a RS |
628 | structure_value_addr |
629 | = XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0); | |
630 | target = 0; | |
631 | } | |
632 | } | |
633 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
634 | } |
635 | ||
636 | /* If called function is inline, try to integrate it. */ | |
637 | ||
638 | if (is_integrable) | |
639 | { | |
640 | rtx temp; | |
2f4aa534 | 641 | rtx before_call = get_last_insn (); |
51bbfa0c RS |
642 | |
643 | temp = expand_inline_function (fndecl, actparms, target, | |
644 | ignore, TREE_TYPE (exp), | |
645 | structure_value_addr); | |
646 | ||
647 | /* If inlining succeeded, return. */ | |
854e97f0 | 648 | if ((HOST_WIDE_INT) temp != -1) |
51bbfa0c | 649 | { |
d64f5a78 RS |
650 | /* Perform all cleanups needed for the arguments of this call |
651 | (i.e. destructors in C++). It is ok if these destructors | |
652 | clobber RETURN_VALUE_REG, because the only time we care about | |
653 | this is when TARGET is that register. But in C++, we take | |
654 | care to never return that register directly. */ | |
655 | expand_cleanups_to (old_cleanups); | |
656 | ||
657 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2f4aa534 RS |
658 | /* If the outgoing argument list must be preserved, push |
659 | the stack before executing the inlined function if it | |
660 | makes any calls. */ | |
661 | ||
662 | for (i = reg_parm_stack_space - 1; i >= 0; i--) | |
663 | if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) | |
664 | break; | |
665 | ||
666 | if (stack_arg_under_construction || i >= 0) | |
667 | { | |
d64f5a78 | 668 | rtx insn = NEXT_INSN (before_call), seq; |
2f4aa534 | 669 | |
d64f5a78 RS |
670 | /* Look for a call in the inline function code. |
671 | If OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) is | |
672 | nonzero then there is a call and it is not necessary | |
673 | to scan the insns. */ | |
674 | ||
675 | if (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) == 0) | |
676 | for (; insn; insn = NEXT_INSN (insn)) | |
677 | if (GET_CODE (insn) == CALL_INSN) | |
678 | break; | |
2f4aa534 RS |
679 | |
680 | if (insn) | |
681 | { | |
d64f5a78 RS |
682 | /* Reserve enough stack space so that the largest |
683 | argument list of any function call in the inline | |
684 | function does not overlap the argument list being | |
685 | evaluated. This is usually an overestimate because | |
686 | allocate_dynamic_stack_space reserves space for an | |
687 | outgoing argument list in addition to the requested | |
688 | space, but there is no way to ask for stack space such | |
689 | that an argument list of a certain length can be | |
690 | safely constructed. */ | |
691 | ||
692 | int adjust = OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)); | |
693 | #ifdef REG_PARM_STACK_SPACE | |
694 | /* Add the stack space reserved for register arguments | |
695 | in the inline function. What is really needed is the | |
696 | largest value of reg_parm_stack_space in the inline | |
697 | function, but that is not available. Using the current | |
698 | value of reg_parm_stack_space is wrong, but gives | |
699 | correct results on all supported machines. */ | |
700 | adjust += reg_parm_stack_space; | |
701 | #endif | |
2f4aa534 | 702 | start_sequence (); |
ccf5d244 | 703 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
e5d70561 RK |
704 | allocate_dynamic_stack_space (GEN_INT (adjust), |
705 | NULL_RTX, BITS_PER_UNIT); | |
2f4aa534 RS |
706 | seq = get_insns (); |
707 | end_sequence (); | |
708 | emit_insns_before (seq, NEXT_INSN (before_call)); | |
e5d70561 | 709 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
2f4aa534 RS |
710 | } |
711 | } | |
d64f5a78 | 712 | #endif |
51bbfa0c RS |
713 | |
714 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
715 | checks in store_expr. They can be equivalent but not equal in the | |
716 | case of a function that returns BLKmode. */ | |
717 | if (temp != target && rtx_equal_p (temp, target)) | |
718 | return target; | |
719 | return temp; | |
720 | } | |
721 | ||
722 | /* If inlining failed, mark FNDECL as needing to be compiled | |
723 | separately after all. */ | |
724 | mark_addressable (fndecl); | |
725 | } | |
726 | ||
727 | /* When calling a const function, we must pop the stack args right away, | |
728 | so that the pop is deleted or moved with the call. */ | |
729 | if (is_const) | |
730 | NO_DEFER_POP; | |
731 | ||
732 | function_call_count++; | |
733 | ||
734 | if (fndecl && DECL_NAME (fndecl)) | |
735 | name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); | |
736 | ||
efd65a8b RS |
737 | /* On some machines (such as the PA) indirect calls have a different |
738 | calling convention than normal calls. FUNCTION_ARG in the target | |
739 | description can look at current_call_is_indirect to determine which | |
740 | calling convention to use. */ | |
741 | current_call_is_indirect = (fndecl == 0); | |
742 | #if 0 | |
743 | = TREE_CODE (TREE_OPERAND (exp, 0)) == NON_LVALUE_EXPR ? 1 : 0; | |
744 | #endif | |
745 | ||
51bbfa0c RS |
746 | #if 0 |
747 | /* Unless it's a call to a specific function that isn't alloca, | |
748 | if it has one argument, we must assume it might be alloca. */ | |
749 | ||
750 | may_be_alloca = | |
751 | (!(fndecl != 0 && strcmp (name, "alloca")) | |
752 | && actparms != 0 | |
753 | && TREE_CHAIN (actparms) == 0); | |
754 | #else | |
755 | /* We assume that alloca will always be called by name. It | |
756 | makes no sense to pass it as a pointer-to-function to | |
757 | anything that does not understand its behavior. */ | |
758 | may_be_alloca = | |
759 | (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 | |
760 | && name[0] == 'a' | |
761 | && ! strcmp (name, "alloca")) | |
762 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
763 | && name[0] == '_' | |
764 | && ! strcmp (name, "__builtin_alloca")))); | |
765 | #endif | |
766 | ||
767 | /* See if this is a call to a function that can return more than once | |
768 | or a call to longjmp. */ | |
769 | ||
770 | returns_twice = 0; | |
771 | is_longjmp = 0; | |
772 | ||
773 | if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15) | |
774 | { | |
775 | char *tname = name; | |
776 | ||
777 | if (name[0] == '_') | |
778 | tname += ((name[1] == '_' && name[2] == 'x') ? 3 : 1); | |
779 | ||
780 | if (tname[0] == 's') | |
781 | { | |
782 | returns_twice | |
783 | = ((tname[1] == 'e' | |
784 | && (! strcmp (tname, "setjmp") | |
785 | || ! strcmp (tname, "setjmp_syscall"))) | |
786 | || (tname[1] == 'i' | |
787 | && ! strcmp (tname, "sigsetjmp")) | |
788 | || (tname[1] == 'a' | |
789 | && ! strcmp (tname, "savectx"))); | |
790 | if (tname[1] == 'i' | |
791 | && ! strcmp (tname, "siglongjmp")) | |
792 | is_longjmp = 1; | |
793 | } | |
794 | else if ((tname[0] == 'q' && tname[1] == 's' | |
795 | && ! strcmp (tname, "qsetjmp")) | |
796 | || (tname[0] == 'v' && tname[1] == 'f' | |
797 | && ! strcmp (tname, "vfork"))) | |
798 | returns_twice = 1; | |
799 | ||
800 | else if (tname[0] == 'l' && tname[1] == 'o' | |
801 | && ! strcmp (tname, "longjmp")) | |
802 | is_longjmp = 1; | |
803 | } | |
804 | ||
51bbfa0c RS |
805 | if (may_be_alloca) |
806 | current_function_calls_alloca = 1; | |
807 | ||
808 | /* Don't let pending stack adjusts add up to too much. | |
809 | Also, do all pending adjustments now | |
810 | if there is any chance this might be a call to alloca. */ | |
811 | ||
812 | if (pending_stack_adjust >= 32 | |
813 | || (pending_stack_adjust > 0 && may_be_alloca)) | |
814 | do_pending_stack_adjust (); | |
815 | ||
816 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
817 | funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
818 | if (TREE_CODE (funtype) != POINTER_TYPE) | |
819 | abort (); | |
820 | funtype = TREE_TYPE (funtype); | |
821 | ||
822 | /* Push the temporary stack slot level so that we can free temporaries used | |
823 | by each of the arguments separately. */ | |
824 | push_temp_slots (); | |
825 | ||
826 | /* Start updating where the next arg would go. */ | |
85ec8ec4 | 827 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX); |
51bbfa0c RS |
828 | |
829 | /* If struct_value_rtx is 0, it means pass the address | |
830 | as if it were an extra parameter. */ | |
831 | if (structure_value_addr && struct_value_rtx == 0) | |
832 | { | |
d64f5a78 | 833 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
834 | /* If the stack will be adjusted, make sure the structure address |
835 | does not refer to virtual_outgoing_args_rtx. */ | |
836 | rtx temp = (stack_arg_under_construction | |
837 | ? copy_addr_to_reg (structure_value_addr) | |
838 | : force_reg (Pmode, structure_value_addr)); | |
d64f5a78 RS |
839 | #else |
840 | rtx temp = force_reg (Pmode, structure_value_addr); | |
841 | #endif | |
842 | ||
51bbfa0c RS |
843 | actparms |
844 | = tree_cons (error_mark_node, | |
845 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2f4aa534 | 846 | temp), |
51bbfa0c RS |
847 | actparms); |
848 | structure_value_addr_parm = 1; | |
849 | } | |
850 | ||
851 | /* Count the arguments and set NUM_ACTUALS. */ | |
852 | for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++; | |
853 | num_actuals = i; | |
854 | ||
855 | /* Compute number of named args. | |
856 | Normally, don't include the last named arg if anonymous args follow. | |
857 | (If no anonymous args follow, the result of list_length | |
858 | is actually one too large.) | |
859 | ||
860 | If SETUP_INCOMING_VARARGS is defined, this machine will be able to | |
861 | place unnamed args that were passed in registers into the stack. So | |
862 | treat all args as named. This allows the insns emitting for a specific | |
d45cf215 | 863 | argument list to be independent of the function declaration. |
51bbfa0c RS |
864 | |
865 | If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable | |
866 | way to pass unnamed args in registers, so we must force them into | |
867 | memory. */ | |
868 | #ifndef SETUP_INCOMING_VARARGS | |
869 | if (TYPE_ARG_TYPES (funtype) != 0) | |
870 | n_named_args | |
871 | = list_length (TYPE_ARG_TYPES (funtype)) - 1 | |
872 | /* Count the struct value address, if it is passed as a parm. */ | |
873 | + structure_value_addr_parm; | |
874 | else | |
875 | #endif | |
876 | /* If we know nothing, treat all args as named. */ | |
877 | n_named_args = num_actuals; | |
878 | ||
879 | /* Make a vector to hold all the information about each arg. */ | |
880 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); | |
881 | bzero (args, num_actuals * sizeof (struct arg_data)); | |
882 | ||
883 | args_size.constant = 0; | |
884 | args_size.var = 0; | |
885 | ||
886 | /* In this loop, we consider args in the order they are written. | |
887 | We fill up ARGS from the front of from the back if necessary | |
888 | so that in any case the first arg to be pushed ends up at the front. */ | |
889 | ||
890 | #ifdef PUSH_ARGS_REVERSED | |
891 | i = num_actuals - 1, inc = -1; | |
892 | /* In this case, must reverse order of args | |
893 | so that we compute and push the last arg first. */ | |
894 | #else | |
895 | i = 0, inc = 1; | |
896 | #endif | |
897 | ||
898 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
899 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
900 | { | |
901 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
84b55618 | 902 | enum machine_mode mode; |
51bbfa0c RS |
903 | |
904 | args[i].tree_value = TREE_VALUE (p); | |
905 | ||
906 | /* Replace erroneous argument with constant zero. */ | |
907 | if (type == error_mark_node || TYPE_SIZE (type) == 0) | |
908 | args[i].tree_value = integer_zero_node, type = integer_type_node; | |
909 | ||
910 | /* Decide where to pass this arg. | |
911 | ||
912 | args[i].reg is nonzero if all or part is passed in registers. | |
913 | ||
914 | args[i].partial is nonzero if part but not all is passed in registers, | |
915 | and the exact value says how many words are passed in registers. | |
916 | ||
917 | args[i].pass_on_stack is nonzero if the argument must at least be | |
918 | computed on the stack. It may then be loaded back into registers | |
919 | if args[i].reg is nonzero. | |
920 | ||
921 | These decisions are driven by the FUNCTION_... macros and must agree | |
922 | with those made by function.c. */ | |
923 | ||
924 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
925 | /* See if this argument should be passed by invisible reference. */ | |
926 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), type, | |
927 | argpos < n_named_args)) | |
928 | { | |
5e0de251 DE |
929 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
930 | if (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type), type, | |
931 | argpos < n_named_args) | |
932 | /* If it's in a register, we must make a copy of it too. */ | |
933 | /* ??? Is this a sufficient test? Is there a better one? */ | |
934 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
935 | && REG_P (DECL_RTL (args[i].tree_value)))) | |
51bbfa0c | 936 | { |
5e0de251 DE |
937 | args[i].tree_value = build1 (ADDR_EXPR, |
938 | build_pointer_type (type), | |
939 | args[i].tree_value); | |
940 | type = build_pointer_type (type); | |
51bbfa0c RS |
941 | } |
942 | else | |
5e0de251 | 943 | #endif |
82c0ff02 | 944 | { |
5e0de251 DE |
945 | /* We make a copy of the object and pass the address to the |
946 | function being called. */ | |
947 | rtx copy; | |
51bbfa0c | 948 | |
5e0de251 DE |
949 | if (TYPE_SIZE (type) == 0 |
950 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
951 | { | |
952 | /* This is a variable-sized object. Make space on the stack | |
953 | for it. */ | |
954 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
955 | ||
956 | if (old_stack_level == 0) | |
957 | { | |
958 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
959 | old_pending_adj = pending_stack_adjust; | |
960 | pending_stack_adjust = 0; | |
961 | } | |
962 | ||
963 | copy = gen_rtx (MEM, BLKmode, | |
964 | allocate_dynamic_stack_space (size_rtx, | |
965 | NULL_RTX, | |
966 | TYPE_ALIGN (type))); | |
967 | } | |
968 | else | |
969 | { | |
970 | int size = int_size_in_bytes (type); | |
971 | copy = assign_stack_temp (TYPE_MODE (type), size, 1); | |
972 | } | |
51bbfa0c | 973 | |
5e0de251 DE |
974 | store_expr (args[i].tree_value, copy, 0); |
975 | ||
976 | args[i].tree_value = build1 (ADDR_EXPR, | |
977 | build_pointer_type (type), | |
978 | make_tree (type, copy)); | |
979 | type = build_pointer_type (type); | |
980 | } | |
51bbfa0c | 981 | } |
5e0de251 | 982 | #endif /* FUNCTION_ARG_PASS_BY_REFERENCE */ |
51bbfa0c | 983 | |
84b55618 RK |
984 | mode = TYPE_MODE (type); |
985 | ||
986 | #ifdef PROMOTE_FUNCTION_ARGS | |
987 | /* Compute the mode in which the arg is actually to be extended to. */ | |
988 | if (TREE_CODE (type) == INTEGER_TYPE || TREE_CODE (type) == ENUMERAL_TYPE | |
989 | || TREE_CODE (type) == BOOLEAN_TYPE || TREE_CODE (type) == CHAR_TYPE | |
990 | || TREE_CODE (type) == REAL_TYPE || TREE_CODE (type) == POINTER_TYPE | |
991 | || TREE_CODE (type) == OFFSET_TYPE) | |
992 | { | |
993 | int unsignedp = TREE_UNSIGNED (type); | |
994 | PROMOTE_MODE (mode, unsignedp, type); | |
995 | args[i].unsignedp = unsignedp; | |
996 | } | |
997 | #endif | |
998 | ||
1efe6448 | 999 | args[i].mode = mode; |
84b55618 | 1000 | args[i].reg = FUNCTION_ARG (args_so_far, mode, type, |
51bbfa0c RS |
1001 | argpos < n_named_args); |
1002 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
1003 | if (args[i].reg) | |
1004 | args[i].partial | |
84b55618 | 1005 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type, |
51bbfa0c RS |
1006 | argpos < n_named_args); |
1007 | #endif | |
1008 | ||
84b55618 | 1009 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); |
51bbfa0c RS |
1010 | |
1011 | /* If FUNCTION_ARG returned an (expr_list (nil) FOO), it means that | |
1012 | we are to pass this arg in the register(s) designated by FOO, but | |
1013 | also to pass it in the stack. */ | |
1014 | if (args[i].reg && GET_CODE (args[i].reg) == EXPR_LIST | |
1015 | && XEXP (args[i].reg, 0) == 0) | |
1016 | args[i].pass_on_stack = 1, args[i].reg = XEXP (args[i].reg, 1); | |
1017 | ||
1018 | /* If this is an addressable type, we must preallocate the stack | |
1019 | since we must evaluate the object into its final location. | |
1020 | ||
1021 | If this is to be passed in both registers and the stack, it is simpler | |
1022 | to preallocate. */ | |
1023 | if (TREE_ADDRESSABLE (type) | |
1024 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1025 | must_preallocate = 1; | |
1026 | ||
1027 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1028 | we cannot consider this function call constant. */ | |
1029 | if (TREE_ADDRESSABLE (type)) | |
1030 | is_const = 0; | |
1031 | ||
1032 | /* Compute the stack-size of this argument. */ | |
1033 | if (args[i].reg == 0 || args[i].partial != 0 | |
1034 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 1035 | || reg_parm_stack_space > 0 |
51bbfa0c RS |
1036 | #endif |
1037 | || args[i].pass_on_stack) | |
1efe6448 | 1038 | locate_and_pad_parm (mode, type, |
51bbfa0c RS |
1039 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
1040 | 1, | |
1041 | #else | |
1042 | args[i].reg != 0, | |
1043 | #endif | |
1044 | fndecl, &args_size, &args[i].offset, | |
1045 | &args[i].size); | |
1046 | ||
1047 | #ifndef ARGS_GROW_DOWNWARD | |
1048 | args[i].slot_offset = args_size; | |
1049 | #endif | |
1050 | ||
1051 | #ifndef REG_PARM_STACK_SPACE | |
1052 | /* If a part of the arg was put into registers, | |
1053 | don't include that part in the amount pushed. */ | |
1054 | if (! args[i].pass_on_stack) | |
1055 | args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) | |
1056 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
1057 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
1058 | #endif | |
1059 | ||
1060 | /* Update ARGS_SIZE, the total stack space for args so far. */ | |
1061 | ||
1062 | args_size.constant += args[i].size.constant; | |
1063 | if (args[i].size.var) | |
1064 | { | |
1065 | ADD_PARM_SIZE (args_size, args[i].size.var); | |
1066 | } | |
1067 | ||
1068 | /* Since the slot offset points to the bottom of the slot, | |
1069 | we must record it after incrementing if the args grow down. */ | |
1070 | #ifdef ARGS_GROW_DOWNWARD | |
1071 | args[i].slot_offset = args_size; | |
1072 | ||
1073 | args[i].slot_offset.constant = -args_size.constant; | |
1074 | if (args_size.var) | |
1075 | { | |
1076 | SUB_PARM_SIZE (args[i].slot_offset, args_size.var); | |
1077 | } | |
1078 | #endif | |
1079 | ||
1080 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1081 | have been used, etc. */ | |
1082 | ||
1083 | FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type, | |
1084 | argpos < n_named_args); | |
1085 | } | |
1086 | ||
6f90e075 JW |
1087 | #ifdef FINAL_REG_PARM_STACK_SPACE |
1088 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
1089 | args_size.var); | |
1090 | #endif | |
1091 | ||
51bbfa0c RS |
1092 | /* Compute the actual size of the argument block required. The variable |
1093 | and constant sizes must be combined, the size may have to be rounded, | |
1094 | and there may be a minimum required size. */ | |
1095 | ||
1096 | original_args_size = args_size; | |
1097 | if (args_size.var) | |
1098 | { | |
1099 | /* If this function requires a variable-sized argument list, don't try to | |
1100 | make a cse'able block for this call. We may be able to do this | |
1101 | eventually, but it is too complicated to keep track of what insns go | |
1102 | in the cse'able block and which don't. */ | |
1103 | ||
1104 | is_const = 0; | |
1105 | must_preallocate = 1; | |
1106 | ||
1107 | args_size.var = ARGS_SIZE_TREE (args_size); | |
1108 | args_size.constant = 0; | |
1109 | ||
1110 | #ifdef STACK_BOUNDARY | |
1111 | if (STACK_BOUNDARY != BITS_PER_UNIT) | |
1112 | args_size.var = round_up (args_size.var, STACK_BYTES); | |
1113 | #endif | |
1114 | ||
1115 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 1116 | if (reg_parm_stack_space > 0) |
51bbfa0c RS |
1117 | { |
1118 | args_size.var | |
1119 | = size_binop (MAX_EXPR, args_size.var, | |
1120 | size_int (REG_PARM_STACK_SPACE (fndecl))); | |
1121 | ||
1122 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1123 | /* The area corresponding to register parameters is not to count in | |
1124 | the size of the block we need. So make the adjustment. */ | |
1125 | args_size.var | |
1126 | = size_binop (MINUS_EXPR, args_size.var, | |
6f90e075 | 1127 | size_int (reg_parm_stack_space)); |
51bbfa0c RS |
1128 | #endif |
1129 | } | |
1130 | #endif | |
1131 | } | |
1132 | else | |
1133 | { | |
1134 | #ifdef STACK_BOUNDARY | |
1135 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
1136 | / STACK_BYTES) * STACK_BYTES); | |
1137 | #endif | |
1138 | ||
1139 | #ifdef REG_PARM_STACK_SPACE | |
1140 | args_size.constant = MAX (args_size.constant, | |
6f90e075 | 1141 | reg_parm_stack_space); |
e1336658 JW |
1142 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
1143 | if (reg_parm_stack_space == 0) | |
1144 | args_size.constant = 0; | |
1145 | #endif | |
51bbfa0c | 1146 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
6f90e075 | 1147 | args_size.constant -= reg_parm_stack_space; |
51bbfa0c RS |
1148 | #endif |
1149 | #endif | |
1150 | } | |
1151 | ||
1152 | /* See if we have or want to preallocate stack space. | |
1153 | ||
1154 | If we would have to push a partially-in-regs parm | |
1155 | before other stack parms, preallocate stack space instead. | |
1156 | ||
1157 | If the size of some parm is not a multiple of the required stack | |
1158 | alignment, we must preallocate. | |
1159 | ||
1160 | If the total size of arguments that would otherwise create a copy in | |
1161 | a temporary (such as a CALL) is more than half the total argument list | |
1162 | size, preallocation is faster. | |
1163 | ||
1164 | Another reason to preallocate is if we have a machine (like the m88k) | |
1165 | where stack alignment is required to be maintained between every | |
1166 | pair of insns, not just when the call is made. However, we assume here | |
1167 | that such machines either do not have push insns (and hence preallocation | |
1168 | would occur anyway) or the problem is taken care of with | |
1169 | PUSH_ROUNDING. */ | |
1170 | ||
1171 | if (! must_preallocate) | |
1172 | { | |
1173 | int partial_seen = 0; | |
1174 | int copy_to_evaluate_size = 0; | |
1175 | ||
1176 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1177 | { | |
1178 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1179 | partial_seen = 1; | |
1180 | else if (partial_seen && args[i].reg == 0) | |
1181 | must_preallocate = 1; | |
1182 | ||
1183 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1184 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1185 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1186 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1187 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1188 | copy_to_evaluate_size | |
1189 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1190 | } | |
1191 | ||
c62f36cf RS |
1192 | if (copy_to_evaluate_size * 2 >= args_size.constant |
1193 | && args_size.constant > 0) | |
51bbfa0c RS |
1194 | must_preallocate = 1; |
1195 | } | |
1196 | ||
1197 | /* If the structure value address will reference the stack pointer, we must | |
1198 | stabilize it. We don't need to do this if we know that we are not going | |
1199 | to adjust the stack pointer in processing this call. */ | |
1200 | ||
1201 | if (structure_value_addr | |
1202 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
1203 | || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr)) | |
1204 | && (args_size.var | |
1205 | #ifndef ACCUMULATE_OUTGOING_ARGS | |
1206 | || args_size.constant | |
1207 | #endif | |
1208 | )) | |
1209 | structure_value_addr = copy_to_reg (structure_value_addr); | |
1210 | ||
1211 | /* If this function call is cse'able, precompute all the parameters. | |
1212 | Note that if the parameter is constructed into a temporary, this will | |
1213 | cause an additional copy because the parameter will be constructed | |
1214 | into a temporary location and then copied into the outgoing arguments. | |
1215 | If a parameter contains a call to alloca and this function uses the | |
1216 | stack, precompute the parameter. */ | |
1217 | ||
1ce0cb53 JW |
1218 | /* If we preallocated the stack space, and some arguments must be passed |
1219 | on the stack, then we must precompute any parameter which contains a | |
1220 | function call which will store arguments on the stack. | |
1221 | Otherwise, evaluating the parameter may clobber previous parameters | |
1222 | which have already been stored into the stack. */ | |
1223 | ||
51bbfa0c RS |
1224 | for (i = 0; i < num_actuals; i++) |
1225 | if (is_const | |
1226 | || ((args_size.var != 0 || args_size.constant != 0) | |
1ce0cb53 JW |
1227 | && calls_function (args[i].tree_value, 1)) |
1228 | || (must_preallocate && (args_size.var != 0 || args_size.constant != 0) | |
1229 | && calls_function (args[i].tree_value, 0))) | |
51bbfa0c RS |
1230 | { |
1231 | args[i].initial_value = args[i].value | |
e5d70561 | 1232 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1efe6448 RK |
1233 | |
1234 | if (GET_MODE (args[i].value ) != VOIDmode | |
1235 | && GET_MODE (args[i].value) != args[i].mode) | |
1236 | args[i].value = convert_to_mode (args[i].mode, args[i].value, | |
1237 | args[i].unsignedp); | |
51bbfa0c | 1238 | preserve_temp_slots (args[i].value); |
1efe6448 | 1239 | |
51bbfa0c RS |
1240 | free_temp_slots (); |
1241 | ||
1242 | /* ANSI doesn't require a sequence point here, | |
1243 | but PCC has one, so this will avoid some problems. */ | |
1244 | emit_queue (); | |
1245 | } | |
1246 | ||
1247 | /* Now we are about to start emitting insns that can be deleted | |
1248 | if a libcall is deleted. */ | |
1249 | if (is_const) | |
1250 | start_sequence (); | |
1251 | ||
1252 | /* If we have no actual push instructions, or shouldn't use them, | |
1253 | make space for all args right now. */ | |
1254 | ||
1255 | if (args_size.var != 0) | |
1256 | { | |
1257 | if (old_stack_level == 0) | |
1258 | { | |
e5d70561 | 1259 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
51bbfa0c RS |
1260 | old_pending_adj = pending_stack_adjust; |
1261 | pending_stack_adjust = 0; | |
d64f5a78 | 1262 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
1263 | /* stack_arg_under_construction says whether a stack arg is |
1264 | being constructed at the old stack level. Pushing the stack | |
1265 | gets a clean outgoing argument block. */ | |
1266 | old_stack_arg_under_construction = stack_arg_under_construction; | |
1267 | stack_arg_under_construction = 0; | |
d64f5a78 | 1268 | #endif |
51bbfa0c RS |
1269 | } |
1270 | argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0); | |
1271 | } | |
1272 | else if (must_preallocate) | |
1273 | { | |
1274 | /* Note that we must go through the motions of allocating an argument | |
1275 | block even if the size is zero because we may be storing args | |
1276 | in the area reserved for register arguments, which may be part of | |
1277 | the stack frame. */ | |
1278 | int needed = args_size.constant; | |
1279 | ||
1280 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
1281 | /* Store the maximum argument space used. It will be pushed by the | |
1282 | prologue. | |
1283 | ||
1284 | Since the stack pointer will never be pushed, it is possible for | |
1285 | the evaluation of a parm to clobber something we have already | |
1286 | written to the stack. Since most function calls on RISC machines | |
1287 | do not use the stack, this is uncommon, but must work correctly. | |
1288 | ||
1289 | Therefore, we save any area of the stack that was already written | |
1290 | and that we are using. Here we set up to do this by making a new | |
1291 | stack usage map from the old one. The actual save will be done | |
1292 | by store_one_arg. | |
1293 | ||
1294 | Another approach might be to try to reorder the argument | |
1295 | evaluations to avoid this conflicting stack usage. */ | |
1296 | ||
1297 | if (needed > current_function_outgoing_args_size) | |
1298 | current_function_outgoing_args_size = needed; | |
1299 | ||
1300 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
1301 | /* Since we will be writing into the entire argument area, the | |
1302 | map must be allocated for its entire size, not just the part that | |
1303 | is the responsibility of the caller. */ | |
6f90e075 | 1304 | needed += reg_parm_stack_space; |
51bbfa0c RS |
1305 | #endif |
1306 | ||
1307 | #ifdef ARGS_GROW_DOWNWARD | |
1308 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
1309 | needed + 1); | |
1310 | #else | |
1311 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, needed); | |
1312 | #endif | |
1313 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); | |
1314 | ||
1315 | if (initial_highest_arg_in_use) | |
1316 | bcopy (initial_stack_usage_map, stack_usage_map, | |
1317 | initial_highest_arg_in_use); | |
1318 | ||
1319 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) | |
1320 | bzero (&stack_usage_map[initial_highest_arg_in_use], | |
1321 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); | |
1322 | needed = 0; | |
2f4aa534 | 1323 | |
bfbf933a RS |
1324 | /* The address of the outgoing argument list must not be copied to a |
1325 | register here, because argblock would be left pointing to the | |
1326 | wrong place after the call to allocate_dynamic_stack_space below. */ | |
2f4aa534 | 1327 | |
51bbfa0c | 1328 | argblock = virtual_outgoing_args_rtx; |
2f4aa534 | 1329 | |
51bbfa0c RS |
1330 | #else /* not ACCUMULATE_OUTGOING_ARGS */ |
1331 | if (inhibit_defer_pop == 0) | |
1332 | { | |
1333 | /* Try to reuse some or all of the pending_stack_adjust | |
1334 | to get this space. Maybe we can avoid any pushing. */ | |
1335 | if (needed > pending_stack_adjust) | |
1336 | { | |
1337 | needed -= pending_stack_adjust; | |
1338 | pending_stack_adjust = 0; | |
1339 | } | |
1340 | else | |
1341 | { | |
1342 | pending_stack_adjust -= needed; | |
1343 | needed = 0; | |
1344 | } | |
1345 | } | |
1346 | /* Special case this because overhead of `push_block' in this | |
1347 | case is non-trivial. */ | |
1348 | if (needed == 0) | |
1349 | argblock = virtual_outgoing_args_rtx; | |
1350 | else | |
e5d70561 | 1351 | argblock = push_block (GEN_INT (needed), 0, 0); |
51bbfa0c RS |
1352 | |
1353 | /* We only really need to call `copy_to_reg' in the case where push | |
1354 | insns are going to be used to pass ARGBLOCK to a function | |
1355 | call in ARGS. In that case, the stack pointer changes value | |
1356 | from the allocation point to the call point, and hence | |
1357 | the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well. | |
1358 | But might as well always do it. */ | |
1359 | argblock = copy_to_reg (argblock); | |
1360 | #endif /* not ACCUMULATE_OUTGOING_ARGS */ | |
1361 | } | |
1362 | ||
bfbf933a RS |
1363 | |
1364 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
1365 | /* The save/restore code in store_one_arg handles all cases except one: | |
1366 | a constructor call (including a C function returning a BLKmode struct) | |
1367 | to initialize an argument. */ | |
1368 | if (stack_arg_under_construction) | |
1369 | { | |
1370 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
e5d70561 | 1371 | rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant); |
bfbf933a | 1372 | #else |
e5d70561 | 1373 | rtx push_size = GEN_INT (args_size.constant); |
bfbf933a RS |
1374 | #endif |
1375 | if (old_stack_level == 0) | |
1376 | { | |
e5d70561 | 1377 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
bfbf933a RS |
1378 | old_pending_adj = pending_stack_adjust; |
1379 | pending_stack_adjust = 0; | |
1380 | /* stack_arg_under_construction says whether a stack arg is | |
1381 | being constructed at the old stack level. Pushing the stack | |
1382 | gets a clean outgoing argument block. */ | |
1383 | old_stack_arg_under_construction = stack_arg_under_construction; | |
1384 | stack_arg_under_construction = 0; | |
1385 | /* Make a new map for the new argument list. */ | |
1386 | stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use); | |
1387 | bzero (stack_usage_map, highest_outgoing_arg_in_use); | |
1388 | highest_outgoing_arg_in_use = 0; | |
1389 | } | |
e5d70561 | 1390 | allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT); |
bfbf933a RS |
1391 | } |
1392 | /* If argument evaluation might modify the stack pointer, copy the | |
1393 | address of the argument list to a register. */ | |
1394 | for (i = 0; i < num_actuals; i++) | |
1395 | if (args[i].pass_on_stack) | |
1396 | { | |
1397 | argblock = copy_addr_to_reg (argblock); | |
1398 | break; | |
1399 | } | |
1400 | #endif | |
1401 | ||
1402 | ||
51bbfa0c RS |
1403 | /* If we preallocated stack space, compute the address of each argument. |
1404 | We need not ensure it is a valid memory address here; it will be | |
1405 | validized when it is used. */ | |
1406 | if (argblock) | |
1407 | { | |
1408 | rtx arg_reg = argblock; | |
1409 | int arg_offset = 0; | |
1410 | ||
1411 | if (GET_CODE (argblock) == PLUS) | |
1412 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1413 | ||
1414 | for (i = 0; i < num_actuals; i++) | |
1415 | { | |
1416 | rtx offset = ARGS_SIZE_RTX (args[i].offset); | |
1417 | rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); | |
1418 | rtx addr; | |
1419 | ||
1420 | /* Skip this parm if it will not be passed on the stack. */ | |
1421 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1422 | continue; | |
1423 | ||
1424 | if (GET_CODE (offset) == CONST_INT) | |
1425 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1426 | else | |
1427 | addr = gen_rtx (PLUS, Pmode, arg_reg, offset); | |
1428 | ||
1429 | addr = plus_constant (addr, arg_offset); | |
1efe6448 | 1430 | args[i].stack = gen_rtx (MEM, args[i].mode, addr); |
51bbfa0c RS |
1431 | |
1432 | if (GET_CODE (slot_offset) == CONST_INT) | |
1433 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1434 | else | |
1435 | addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset); | |
1436 | ||
1437 | addr = plus_constant (addr, arg_offset); | |
1efe6448 | 1438 | args[i].stack_slot = gen_rtx (MEM, args[i].mode, addr); |
51bbfa0c RS |
1439 | } |
1440 | } | |
1441 | ||
1442 | #ifdef PUSH_ARGS_REVERSED | |
1443 | #ifdef STACK_BOUNDARY | |
1444 | /* If we push args individually in reverse order, perform stack alignment | |
1445 | before the first push (the last arg). */ | |
1446 | if (argblock == 0) | |
e5d70561 RK |
1447 | anti_adjust_stack (GEN_INT (args_size.constant |
1448 | - original_args_size.constant)); | |
51bbfa0c RS |
1449 | #endif |
1450 | #endif | |
1451 | ||
1452 | /* Don't try to defer pops if preallocating, not even from the first arg, | |
1453 | since ARGBLOCK probably refers to the SP. */ | |
1454 | if (argblock) | |
1455 | NO_DEFER_POP; | |
1456 | ||
1457 | /* Get the function to call, in the form of RTL. */ | |
1458 | if (fndecl) | |
1459 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1460 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1461 | else | |
1462 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1463 | { | |
e5d70561 | 1464 | funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
51bbfa0c RS |
1465 | free_temp_slots (); /* FUNEXP can't be BLKmode */ |
1466 | emit_queue (); | |
1467 | } | |
1468 | ||
1469 | /* Figure out the register where the value, if any, will come back. */ | |
1470 | valreg = 0; | |
1471 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
1472 | && ! structure_value_addr) | |
1473 | { | |
1474 | if (pcc_struct_value) | |
1475 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
1476 | fndecl); | |
1477 | else | |
1478 | valreg = hard_function_value (TREE_TYPE (exp), fndecl); | |
1479 | } | |
1480 | ||
1481 | /* Precompute all register parameters. It isn't safe to compute anything | |
1482 | once we have started filling any specific hard regs. */ | |
1483 | reg_parm_seen = 0; | |
1484 | for (i = 0; i < num_actuals; i++) | |
1485 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
1486 | { | |
1487 | reg_parm_seen = 1; | |
1488 | ||
1489 | if (args[i].value == 0) | |
1490 | { | |
e5d70561 RK |
1491 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, |
1492 | VOIDmode, 0); | |
51bbfa0c RS |
1493 | preserve_temp_slots (args[i].value); |
1494 | free_temp_slots (); | |
1495 | ||
1496 | /* ANSI doesn't require a sequence point here, | |
1497 | but PCC has one, so this will avoid some problems. */ | |
1498 | emit_queue (); | |
1499 | } | |
84b55618 RK |
1500 | |
1501 | /* If we are to promote the function arg to a wider mode, | |
1502 | do it now. */ | |
84b55618 | 1503 | |
1efe6448 RK |
1504 | if (GET_MODE (args[i].value) != VOIDmode |
1505 | && GET_MODE (args[i].value) != args[i].mode) | |
1506 | args[i].value = convert_to_mode (args[i].mode, args[i].value, | |
84b55618 | 1507 | args[i].unsignedp); |
51bbfa0c RS |
1508 | } |
1509 | ||
1510 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) | |
1511 | /* The argument list is the property of the called routine and it | |
1512 | may clobber it. If the fixed area has been used for previous | |
1513 | parameters, we must save and restore it. | |
1514 | ||
1515 | Here we compute the boundary of the that needs to be saved, if any. */ | |
1516 | ||
b94301c2 RS |
1517 | #ifdef ARGS_GROW_DOWNWARD |
1518 | for (i = 0; i < reg_parm_stack_space + 1; i++) | |
1519 | #else | |
6f90e075 | 1520 | for (i = 0; i < reg_parm_stack_space; i++) |
b94301c2 | 1521 | #endif |
51bbfa0c RS |
1522 | { |
1523 | if (i >= highest_outgoing_arg_in_use | |
1524 | || stack_usage_map[i] == 0) | |
1525 | continue; | |
1526 | ||
1527 | if (low_to_save == -1) | |
1528 | low_to_save = i; | |
1529 | ||
1530 | high_to_save = i; | |
1531 | } | |
1532 | ||
1533 | if (low_to_save >= 0) | |
1534 | { | |
1535 | int num_to_save = high_to_save - low_to_save + 1; | |
1536 | enum machine_mode save_mode | |
1537 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
1538 | rtx stack_area; | |
1539 | ||
1540 | /* If we don't have the required alignment, must do this in BLKmode. */ | |
1541 | if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
1542 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
1543 | save_mode = BLKmode; | |
1544 | ||
1545 | stack_area = gen_rtx (MEM, save_mode, | |
1546 | memory_address (save_mode, | |
b94301c2 RS |
1547 | |
1548 | #ifdef ARGS_GROW_DOWNWARD | |
1549 | plus_constant (argblock, | |
1550 | - high_to_save) | |
1551 | #else | |
51bbfa0c | 1552 | plus_constant (argblock, |
b94301c2 RS |
1553 | low_to_save) |
1554 | #endif | |
1555 | )); | |
51bbfa0c RS |
1556 | if (save_mode == BLKmode) |
1557 | { | |
1558 | save_area = assign_stack_temp (BLKmode, num_to_save, 1); | |
1559 | emit_block_move (validize_mem (save_area), stack_area, | |
e5d70561 | 1560 | GEN_INT (num_to_save), |
51bbfa0c RS |
1561 | PARM_BOUNDARY / BITS_PER_UNIT); |
1562 | } | |
1563 | else | |
1564 | { | |
1565 | save_area = gen_reg_rtx (save_mode); | |
1566 | emit_move_insn (save_area, stack_area); | |
1567 | } | |
1568 | } | |
1569 | #endif | |
1570 | ||
1571 | ||
1572 | /* Now store (and compute if necessary) all non-register parms. | |
1573 | These come before register parms, since they can require block-moves, | |
1574 | which could clobber the registers used for register parms. | |
1575 | Parms which have partial registers are not stored here, | |
1576 | but we do preallocate space here if they want that. */ | |
1577 | ||
1578 | for (i = 0; i < num_actuals; i++) | |
1579 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
1580 | store_one_arg (&args[i], argblock, may_be_alloca, | |
6f90e075 | 1581 | args_size.var != 0, fndecl, reg_parm_stack_space); |
51bbfa0c | 1582 | |
4ab56118 RK |
1583 | #ifdef STRICT_ALIGNMENT |
1584 | /* If we have a parm that is passed in registers but not in memory | |
1585 | and whose alignment does not permit a direct copy into registers, | |
1586 | make a group of pseudos that correspond to each register that we | |
1587 | will later fill. */ | |
1588 | ||
1589 | for (i = 0; i < num_actuals; i++) | |
1590 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
1591 | && args[i].mode == BLKmode | |
1592 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
1593 | < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
1594 | { | |
1595 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1596 | ||
1597 | args[i].n_aligned_regs | |
1598 | = args[i].partial ? args[i].partial | |
1599 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1600 | ||
1601 | args[i].aligned_regs = (rtx *) alloca (sizeof (rtx) | |
1602 | * args[i].n_aligned_regs); | |
1603 | ||
1604 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1605 | { | |
1606 | rtx reg = gen_reg_rtx (word_mode); | |
1607 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1608 | int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); | |
1609 | int bitpos; | |
1610 | ||
1611 | args[i].aligned_regs[j] = reg; | |
1612 | ||
1613 | /* Clobber REG and move each partword into it. Ensure we don't | |
1614 | go past the end of the structure. Note that the loop below | |
1615 | works because we've already verified that padding | |
1616 | and endianness are compatible. */ | |
1617 | ||
1618 | emit_insn (gen_rtx (CLOBBER, VOIDmode, reg)); | |
1619 | ||
1620 | for (bitpos = 0; | |
7a03f4b4 | 1621 | bitpos < BITS_PER_WORD && bytes > 0; |
4ab56118 RK |
1622 | bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT) |
1623 | { | |
1624 | int xbitpos = (BYTES_BIG_ENDIAN | |
fd328506 | 1625 | ? BITS_PER_WORD - bitpos - bitsize |
4ab56118 RK |
1626 | : bitpos); |
1627 | ||
1628 | store_bit_field (reg, bitsize, xbitpos, word_mode, | |
1629 | extract_bit_field (word, bitsize, xbitpos, 1, | |
1630 | NULL_RTX, word_mode, | |
1631 | word_mode, | |
1632 | bitsize / BITS_PER_UNIT, | |
1633 | BITS_PER_WORD), | |
1634 | bitsize / BITS_PER_UNIT, BITS_PER_WORD); | |
1635 | } | |
1636 | } | |
1637 | } | |
1638 | #endif | |
1639 | ||
51bbfa0c RS |
1640 | /* Now store any partially-in-registers parm. |
1641 | This is the last place a block-move can happen. */ | |
1642 | if (reg_parm_seen) | |
1643 | for (i = 0; i < num_actuals; i++) | |
1644 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
1645 | store_one_arg (&args[i], argblock, may_be_alloca, | |
6f90e075 | 1646 | args_size.var != 0, fndecl, reg_parm_stack_space); |
51bbfa0c RS |
1647 | |
1648 | #ifndef PUSH_ARGS_REVERSED | |
1649 | #ifdef STACK_BOUNDARY | |
1650 | /* If we pushed args in forward order, perform stack alignment | |
1651 | after pushing the last arg. */ | |
1652 | if (argblock == 0) | |
e5d70561 RK |
1653 | anti_adjust_stack (GEN_INT (args_size.constant |
1654 | - original_args_size.constant)); | |
51bbfa0c RS |
1655 | #endif |
1656 | #endif | |
1657 | ||
756e0e12 RS |
1658 | /* If register arguments require space on the stack and stack space |
1659 | was not preallocated, allocate stack space here for arguments | |
1660 | passed in registers. */ | |
1661 | #if ! defined(ALLOCATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE) | |
1662 | if (must_preallocate == 0 && reg_parm_stack_space > 0) | |
e5d70561 | 1663 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
1664 | #endif |
1665 | ||
51bbfa0c RS |
1666 | /* Pass the function the address in which to return a structure value. */ |
1667 | if (structure_value_addr && ! structure_value_addr_parm) | |
1668 | { | |
1669 | emit_move_insn (struct_value_rtx, | |
1670 | force_reg (Pmode, | |
e5d70561 RK |
1671 | force_operand (structure_value_addr, |
1672 | NULL_RTX))); | |
51bbfa0c RS |
1673 | if (GET_CODE (struct_value_rtx) == REG) |
1674 | { | |
1675 | push_to_sequence (use_insns); | |
1676 | emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx)); | |
1677 | use_insns = get_insns (); | |
1678 | end_sequence (); | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* Now do the register loads required for any wholly-register parms or any | |
1683 | parms which are passed both on the stack and in a register. Their | |
1684 | expressions were already evaluated. | |
1685 | ||
1686 | Mark all register-parms as living through the call, putting these USE | |
1687 | insns in a list headed by USE_INSNS. */ | |
1688 | ||
1689 | for (i = 0; i < num_actuals; i++) | |
1690 | { | |
1691 | rtx list = args[i].reg; | |
1692 | int partial = args[i].partial; | |
1693 | ||
1694 | while (list) | |
1695 | { | |
1696 | rtx reg; | |
1697 | int nregs; | |
1698 | ||
1699 | /* Process each register that needs to get this arg. */ | |
1700 | if (GET_CODE (list) == EXPR_LIST) | |
1701 | reg = XEXP (list, 0), list = XEXP (list, 1); | |
1702 | else | |
1703 | reg = list, list = 0; | |
1704 | ||
1705 | /* Set to non-zero if must move a word at a time, even if just one | |
1706 | word (e.g, partial == 1 && mode == DFmode). Set to zero if | |
1707 | we just use a normal move insn. */ | |
1708 | nregs = (partial ? partial | |
1709 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1710 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) | |
1711 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
1712 | : 0)); | |
1713 | ||
1714 | /* If simple case, just do move. If normal partial, store_one_arg | |
1715 | has already loaded the register for us. In all other cases, | |
1716 | load the register(s) from memory. */ | |
1717 | ||
1718 | if (nregs == 0) | |
1719 | emit_move_insn (reg, args[i].value); | |
4ab56118 RK |
1720 | |
1721 | #ifdef STRICT_ALIGNMENT | |
1722 | /* If we have pre-computed the values to put in the registers in | |
1723 | the case of non-aligned structures, copy them in now. */ | |
1724 | ||
1725 | else if (args[i].n_aligned_regs != 0) | |
1726 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1727 | emit_move_insn (gen_rtx (REG, word_mode, REGNO (reg) + j), | |
1728 | args[i].aligned_regs[j]); | |
1729 | #endif | |
1730 | ||
51bbfa0c RS |
1731 | else if (args[i].partial == 0 || args[i].pass_on_stack) |
1732 | move_block_to_reg (REGNO (reg), | |
1733 | validize_mem (args[i].value), nregs, | |
1efe6448 | 1734 | args[i].mode); |
51bbfa0c RS |
1735 | |
1736 | push_to_sequence (use_insns); | |
1737 | if (nregs == 0) | |
1738 | emit_insn (gen_rtx (USE, VOIDmode, reg)); | |
1739 | else | |
1740 | use_regs (REGNO (reg), nregs); | |
1741 | use_insns = get_insns (); | |
1742 | end_sequence (); | |
1743 | ||
1744 | /* PARTIAL referred only to the first register, so clear it for the | |
1745 | next time. */ | |
1746 | partial = 0; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | /* Perform postincrements before actually calling the function. */ | |
1751 | emit_queue (); | |
1752 | ||
1753 | /* All arguments and registers used for the call must be set up by now! */ | |
1754 | ||
1755 | funexp = prepare_call_address (funexp, fndecl, &use_insns); | |
1756 | ||
1757 | /* Generate the actual call instruction. */ | |
1758 | emit_call_1 (funexp, funtype, args_size.constant, struct_value_size, | |
1759 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
1760 | valreg, old_inhibit_defer_pop, use_insns, is_const); | |
1761 | ||
1762 | /* If call is cse'able, make appropriate pair of reg-notes around it. | |
1763 | Test valreg so we don't crash; may safely ignore `const' | |
1764 | if return type is void. */ | |
1765 | if (is_const && valreg != 0) | |
1766 | { | |
1767 | rtx note = 0; | |
1768 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
1769 | rtx insns; | |
1770 | ||
1771 | /* Construct an "equal form" for the value which mentions all the | |
1772 | arguments in order as well as the function name. */ | |
1773 | #ifdef PUSH_ARGS_REVERSED | |
1774 | for (i = 0; i < num_actuals; i++) | |
1775 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); | |
1776 | #else | |
1777 | for (i = num_actuals - 1; i >= 0; i--) | |
1778 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); | |
1779 | #endif | |
1780 | note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note); | |
1781 | ||
1782 | insns = get_insns (); | |
1783 | end_sequence (); | |
1784 | ||
1785 | emit_libcall_block (insns, temp, valreg, note); | |
1786 | ||
1787 | valreg = temp; | |
1788 | } | |
1789 | ||
1790 | /* For calls to `setjmp', etc., inform flow.c it should complain | |
1791 | if nonvolatile values are live. */ | |
1792 | ||
1793 | if (returns_twice) | |
1794 | { | |
1795 | emit_note (name, NOTE_INSN_SETJMP); | |
1796 | current_function_calls_setjmp = 1; | |
1797 | } | |
1798 | ||
1799 | if (is_longjmp) | |
1800 | current_function_calls_longjmp = 1; | |
1801 | ||
1802 | /* Notice functions that cannot return. | |
1803 | If optimizing, insns emitted below will be dead. | |
1804 | If not optimizing, they will exist, which is useful | |
1805 | if the user uses the `return' command in the debugger. */ | |
1806 | ||
1807 | if (is_volatile || is_longjmp) | |
1808 | emit_barrier (); | |
1809 | ||
51bbfa0c RS |
1810 | /* If value type not void, return an rtx for the value. */ |
1811 | ||
1812 | /* If there are cleanups to be called, don't use a hard reg as target. */ | |
1813 | if (cleanups_this_call != old_cleanups | |
1814 | && target && REG_P (target) | |
1815 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
1816 | target = 0; | |
1817 | ||
1818 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode | |
1819 | || ignore) | |
1820 | { | |
1821 | target = const0_rtx; | |
1822 | } | |
1823 | else if (structure_value_addr) | |
1824 | { | |
1825 | if (target == 0 || GET_CODE (target) != MEM) | |
29008b51 JW |
1826 | { |
1827 | target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), | |
1828 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
1829 | structure_value_addr)); | |
1830 | MEM_IN_STRUCT_P (target) | |
1831 | = (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
1832 | || TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
c1b98a95 RK |
1833 | || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE |
1834 | || TREE_CODE (TREE_TYPE (exp)) == QUAL_UNION_TYPE); | |
29008b51 | 1835 | } |
51bbfa0c RS |
1836 | } |
1837 | else if (pcc_struct_value) | |
1838 | { | |
1839 | if (target == 0) | |
29008b51 JW |
1840 | { |
1841 | target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), | |
1842 | copy_to_reg (valreg)); | |
1843 | MEM_IN_STRUCT_P (target) | |
1844 | = (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
1845 | || TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
c1b98a95 RK |
1846 | || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE |
1847 | || TREE_CODE (TREE_TYPE (exp)) == QUAL_UNION_TYPE); | |
29008b51 | 1848 | } |
51bbfa0c RS |
1849 | else if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode) |
1850 | emit_move_insn (target, gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), | |
1851 | copy_to_reg (valreg))); | |
1852 | else | |
1853 | emit_block_move (target, gen_rtx (MEM, BLKmode, copy_to_reg (valreg)), | |
1854 | expr_size (exp), | |
1855 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
1856 | } | |
84b55618 RK |
1857 | else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) |
1858 | && GET_MODE (target) == GET_MODE (valreg)) | |
51bbfa0c RS |
1859 | /* TARGET and VALREG cannot be equal at this point because the latter |
1860 | would not have REG_FUNCTION_VALUE_P true, while the former would if | |
1861 | it were referring to the same register. | |
1862 | ||
1863 | If they refer to the same register, this move will be a no-op, except | |
1864 | when function inlining is being done. */ | |
1865 | emit_move_insn (target, valreg); | |
1866 | else | |
1867 | target = copy_to_reg (valreg); | |
1868 | ||
84b55618 | 1869 | #ifdef PROMOTE_FUNCTION_RETURN |
5d2ac65e RK |
1870 | /* If we promoted this return value, make the proper SUBREG. TARGET |
1871 | might be const0_rtx here, so be careful. */ | |
1872 | if (GET_CODE (target) == REG | |
1873 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
84b55618 | 1874 | { |
5d2ac65e | 1875 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp)); |
84b55618 RK |
1876 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (exp)); |
1877 | ||
1878 | if (TREE_CODE (TREE_TYPE (exp)) == INTEGER_TYPE | |
1879 | || TREE_CODE (TREE_TYPE (exp)) == ENUMERAL_TYPE | |
1880 | || TREE_CODE (TREE_TYPE (exp)) == BOOLEAN_TYPE | |
1881 | || TREE_CODE (TREE_TYPE (exp)) == CHAR_TYPE | |
1882 | || TREE_CODE (TREE_TYPE (exp)) == REAL_TYPE | |
1883 | || TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE | |
1884 | || TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE) | |
1885 | { | |
1886 | PROMOTE_MODE (mode, unsignedp, TREE_TYPE (exp)); | |
1887 | } | |
1888 | ||
5d2ac65e RK |
1889 | /* If we didn't promote as expected, something is wrong. */ |
1890 | if (mode != GET_MODE (target)) | |
1891 | abort (); | |
1892 | ||
84b55618 RK |
1893 | target = gen_rtx (SUBREG, TYPE_MODE (TREE_TYPE (exp)), target, 0); |
1894 | SUBREG_PROMOTED_VAR_P (target) = 1; | |
1895 | SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; | |
1896 | } | |
1897 | #endif | |
1898 | ||
51bbfa0c RS |
1899 | /* Perform all cleanups needed for the arguments of this call |
1900 | (i.e. destructors in C++). */ | |
1901 | expand_cleanups_to (old_cleanups); | |
1902 | ||
2f4aa534 RS |
1903 | /* If size of args is variable or this was a constructor call for a stack |
1904 | argument, restore saved stack-pointer value. */ | |
51bbfa0c RS |
1905 | |
1906 | if (old_stack_level) | |
1907 | { | |
e5d70561 | 1908 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
51bbfa0c | 1909 | pending_stack_adjust = old_pending_adj; |
d64f5a78 | 1910 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
1911 | stack_arg_under_construction = old_stack_arg_under_construction; |
1912 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
1913 | stack_usage_map = initial_stack_usage_map; | |
d64f5a78 | 1914 | #endif |
51bbfa0c | 1915 | } |
51bbfa0c RS |
1916 | #ifdef ACCUMULATE_OUTGOING_ARGS |
1917 | else | |
1918 | { | |
1919 | #ifdef REG_PARM_STACK_SPACE | |
1920 | if (save_area) | |
1921 | { | |
1922 | enum machine_mode save_mode = GET_MODE (save_area); | |
1923 | rtx stack_area | |
1924 | = gen_rtx (MEM, save_mode, | |
1925 | memory_address (save_mode, | |
b94301c2 RS |
1926 | #ifdef ARGS_GROW_DOWNWARD |
1927 | plus_constant (argblock, - high_to_save) | |
1928 | #else | |
1929 | plus_constant (argblock, low_to_save) | |
1930 | #endif | |
1931 | )); | |
51bbfa0c RS |
1932 | |
1933 | if (save_mode != BLKmode) | |
1934 | emit_move_insn (stack_area, save_area); | |
1935 | else | |
1936 | emit_block_move (stack_area, validize_mem (save_area), | |
e5d70561 RK |
1937 | GEN_INT (high_to_save - low_to_save + 1), |
1938 | PARM_BOUNDARY / BITS_PER_UNIT); | |
51bbfa0c RS |
1939 | } |
1940 | #endif | |
1941 | ||
1942 | /* If we saved any argument areas, restore them. */ | |
1943 | for (i = 0; i < num_actuals; i++) | |
1944 | if (args[i].save_area) | |
1945 | { | |
1946 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
1947 | rtx stack_area | |
1948 | = gen_rtx (MEM, save_mode, | |
1949 | memory_address (save_mode, | |
1950 | XEXP (args[i].stack_slot, 0))); | |
1951 | ||
1952 | if (save_mode != BLKmode) | |
1953 | emit_move_insn (stack_area, args[i].save_area); | |
1954 | else | |
1955 | emit_block_move (stack_area, validize_mem (args[i].save_area), | |
e5d70561 | 1956 | GEN_INT (args[i].size.constant), |
51bbfa0c RS |
1957 | PARM_BOUNDARY / BITS_PER_UNIT); |
1958 | } | |
1959 | ||
1960 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
1961 | stack_usage_map = initial_stack_usage_map; | |
1962 | } | |
1963 | #endif | |
1964 | ||
59257ff7 RK |
1965 | /* If this was alloca, record the new stack level for nonlocal gotos. |
1966 | Check for the handler slots since we might not have a save area | |
1967 | for non-local gotos. */ | |
1968 | ||
1969 | if (may_be_alloca && nonlocal_goto_handler_slot != 0) | |
e5d70561 | 1970 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
51bbfa0c RS |
1971 | |
1972 | pop_temp_slots (); | |
1973 | ||
1974 | return target; | |
1975 | } | |
1976 | \f | |
322e3e34 RK |
1977 | /* Output a library call to function FUN (a SYMBOL_REF rtx) |
1978 | (emitting the queue unless NO_QUEUE is nonzero), | |
1979 | for a value of mode OUTMODE, | |
1980 | with NARGS different arguments, passed as alternating rtx values | |
1981 | and machine_modes to convert them to. | |
1982 | The rtx values should have been passed through protect_from_queue already. | |
1983 | ||
1984 | NO_QUEUE will be true if and only if the library call is a `const' call | |
1985 | which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent | |
1986 | to the variable is_const in expand_call. | |
1987 | ||
1988 | NO_QUEUE must be true for const calls, because if it isn't, then | |
1989 | any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes, | |
1990 | and will be lost if the libcall sequence is optimized away. | |
1991 | ||
1992 | NO_QUEUE must be false for non-const calls, because if it isn't, the | |
1993 | call insn will have its CONST_CALL_P bit set, and it will be incorrectly | |
1994 | optimized. For instance, the instruction scheduler may incorrectly | |
1995 | move memory references across the non-const call. */ | |
1996 | ||
1997 | void | |
1998 | emit_library_call (va_alist) | |
1999 | va_dcl | |
2000 | { | |
2001 | va_list p; | |
2002 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2003 | struct args_size args_size; | |
2004 | /* Size of arguments before any adjustments (such as rounding). */ | |
2005 | struct args_size original_args_size; | |
2006 | register int argnum; | |
2007 | enum machine_mode outmode; | |
2008 | int nargs; | |
2009 | rtx fun; | |
2010 | rtx orgfun; | |
2011 | int inc; | |
2012 | int count; | |
2013 | rtx argblock = 0; | |
2014 | CUMULATIVE_ARGS args_so_far; | |
2015 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; | |
2016 | struct args_size offset; struct args_size size; }; | |
2017 | struct arg *argvec; | |
2018 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
2019 | int no_queue = 0; | |
2020 | rtx use_insns; | |
efd65a8b RS |
2021 | /* library calls are never indirect calls. */ |
2022 | int current_call_is_indirect = 0; | |
322e3e34 RK |
2023 | |
2024 | va_start (p); | |
2025 | orgfun = fun = va_arg (p, rtx); | |
2026 | no_queue = va_arg (p, int); | |
2027 | outmode = va_arg (p, enum machine_mode); | |
2028 | nargs = va_arg (p, int); | |
2029 | ||
2030 | /* Copy all the libcall-arguments out of the varargs data | |
2031 | and into a vector ARGVEC. | |
2032 | ||
2033 | Compute how to pass each argument. We only support a very small subset | |
2034 | of the full argument passing conventions to limit complexity here since | |
2035 | library functions shouldn't have many args. */ | |
2036 | ||
2037 | argvec = (struct arg *) alloca (nargs * sizeof (struct arg)); | |
2038 | ||
2039 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); | |
2040 | ||
2041 | args_size.constant = 0; | |
2042 | args_size.var = 0; | |
2043 | ||
2044 | for (count = 0; count < nargs; count++) | |
2045 | { | |
2046 | rtx val = va_arg (p, rtx); | |
2047 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
2048 | ||
2049 | /* We cannot convert the arg value to the mode the library wants here; | |
2050 | must do it earlier where we know the signedness of the arg. */ | |
2051 | if (mode == BLKmode | |
2052 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
2053 | abort (); | |
2054 | ||
2055 | /* On some machines, there's no way to pass a float to a library fcn. | |
2056 | Pass it as a double instead. */ | |
2057 | #ifdef LIBGCC_NEEDS_DOUBLE | |
2058 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
2059 | val = convert_to_mode (DFmode, val, 0), mode = DFmode; | |
2060 | #endif | |
2061 | ||
2062 | /* There's no need to call protect_from_queue, because | |
2063 | either emit_move_insn or emit_push_insn will do that. */ | |
2064 | ||
2065 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
2066 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
2067 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
2068 | val = force_operand (val, NULL_RTX); | |
2069 | ||
2070 | argvec[count].value = val; | |
2071 | argvec[count].mode = mode; | |
2072 | ||
2073 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
2074 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
2075 | abort (); | |
2076 | #endif | |
2077 | ||
2078 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
2079 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) | |
2080 | abort (); | |
2081 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
2082 | argvec[count].partial | |
2083 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
2084 | #else | |
2085 | argvec[count].partial = 0; | |
2086 | #endif | |
2087 | ||
2088 | locate_and_pad_parm (mode, NULL_TREE, | |
2089 | argvec[count].reg && argvec[count].partial == 0, | |
2090 | NULL_TREE, &args_size, &argvec[count].offset, | |
2091 | &argvec[count].size); | |
2092 | ||
2093 | if (argvec[count].size.var) | |
2094 | abort (); | |
2095 | ||
2096 | #ifndef REG_PARM_STACK_SPACE | |
2097 | if (argvec[count].partial) | |
2098 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
2099 | #endif | |
2100 | ||
2101 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
2102 | #ifdef REG_PARM_STACK_SPACE | |
2103 | || 1 | |
2104 | #endif | |
2105 | ) | |
2106 | args_size.constant += argvec[count].size.constant; | |
2107 | ||
2108 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2109 | /* If this arg is actually passed on the stack, it might be | |
2110 | clobbering something we already put there (this library call might | |
2111 | be inside the evaluation of an argument to a function whose call | |
2112 | requires the stack). This will only occur when the library call | |
2113 | has sufficient args to run out of argument registers. Abort in | |
2114 | this case; if this ever occurs, code must be added to save and | |
2115 | restore the arg slot. */ | |
2116 | ||
2117 | if (argvec[count].reg == 0 || argvec[count].partial != 0) | |
2118 | abort (); | |
2119 | #endif | |
2120 | ||
2121 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); | |
2122 | } | |
2123 | va_end (p); | |
2124 | ||
2125 | /* If this machine requires an external definition for library | |
2126 | functions, write one out. */ | |
2127 | assemble_external_libcall (fun); | |
2128 | ||
2129 | original_args_size = args_size; | |
2130 | #ifdef STACK_BOUNDARY | |
2131 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
2132 | / STACK_BYTES) * STACK_BYTES); | |
2133 | #endif | |
2134 | ||
2135 | #ifdef REG_PARM_STACK_SPACE | |
2136 | args_size.constant = MAX (args_size.constant, | |
2137 | REG_PARM_STACK_SPACE (NULL_TREE)); | |
2138 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
2139 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); | |
2140 | #endif | |
2141 | #endif | |
2142 | ||
2143 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2144 | if (args_size.constant > current_function_outgoing_args_size) | |
2145 | current_function_outgoing_args_size = args_size.constant; | |
2146 | args_size.constant = 0; | |
2147 | #endif | |
2148 | ||
2149 | #ifndef PUSH_ROUNDING | |
2150 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
2151 | #endif | |
2152 | ||
2153 | #ifdef PUSH_ARGS_REVERSED | |
2154 | #ifdef STACK_BOUNDARY | |
2155 | /* If we push args individually in reverse order, perform stack alignment | |
2156 | before the first push (the last arg). */ | |
2157 | if (argblock == 0) | |
2158 | anti_adjust_stack (GEN_INT (args_size.constant | |
2159 | - original_args_size.constant)); | |
2160 | #endif | |
2161 | #endif | |
2162 | ||
2163 | #ifdef PUSH_ARGS_REVERSED | |
2164 | inc = -1; | |
2165 | argnum = nargs - 1; | |
2166 | #else | |
2167 | inc = 1; | |
2168 | argnum = 0; | |
2169 | #endif | |
2170 | ||
2171 | /* Push the args that need to be pushed. */ | |
2172 | ||
2173 | for (count = 0; count < nargs; count++, argnum += inc) | |
2174 | { | |
2175 | register enum machine_mode mode = argvec[argnum].mode; | |
2176 | register rtx val = argvec[argnum].value; | |
2177 | rtx reg = argvec[argnum].reg; | |
2178 | int partial = argvec[argnum].partial; | |
2179 | ||
2180 | if (! (reg != 0 && partial == 0)) | |
2181 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, | |
2182 | argblock, GEN_INT (argvec[count].offset.constant)); | |
2183 | NO_DEFER_POP; | |
2184 | } | |
2185 | ||
2186 | #ifndef PUSH_ARGS_REVERSED | |
2187 | #ifdef STACK_BOUNDARY | |
2188 | /* If we pushed args in forward order, perform stack alignment | |
2189 | after pushing the last arg. */ | |
2190 | if (argblock == 0) | |
2191 | anti_adjust_stack (GEN_INT (args_size.constant | |
2192 | - original_args_size.constant)); | |
2193 | #endif | |
2194 | #endif | |
2195 | ||
2196 | #ifdef PUSH_ARGS_REVERSED | |
2197 | argnum = nargs - 1; | |
2198 | #else | |
2199 | argnum = 0; | |
2200 | #endif | |
2201 | ||
2202 | /* Now load any reg parms into their regs. */ | |
2203 | ||
2204 | for (count = 0; count < nargs; count++, argnum += inc) | |
2205 | { | |
2206 | register enum machine_mode mode = argvec[argnum].mode; | |
2207 | register rtx val = argvec[argnum].value; | |
2208 | rtx reg = argvec[argnum].reg; | |
2209 | int partial = argvec[argnum].partial; | |
2210 | ||
2211 | if (reg != 0 && partial == 0) | |
2212 | emit_move_insn (reg, val); | |
2213 | NO_DEFER_POP; | |
2214 | } | |
2215 | ||
2216 | /* For version 1.37, try deleting this entirely. */ | |
2217 | if (! no_queue) | |
2218 | emit_queue (); | |
2219 | ||
2220 | /* Any regs containing parms remain in use through the call. */ | |
2221 | start_sequence (); | |
2222 | for (count = 0; count < nargs; count++) | |
2223 | if (argvec[count].reg != 0) | |
2224 | emit_insn (gen_rtx (USE, VOIDmode, argvec[count].reg)); | |
2225 | ||
2226 | use_insns = get_insns (); | |
2227 | end_sequence (); | |
2228 | ||
2229 | fun = prepare_call_address (fun, NULL_TREE, &use_insns); | |
2230 | ||
2231 | /* Don't allow popping to be deferred, since then | |
2232 | cse'ing of library calls could delete a call and leave the pop. */ | |
2233 | NO_DEFER_POP; | |
2234 | ||
2235 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which | |
2236 | will set inhibit_defer_pop to that value. */ | |
2237 | ||
2238 | emit_call_1 (fun, get_identifier (XSTR (orgfun, 0)), args_size.constant, 0, | |
2239 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
2240 | outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX, | |
2241 | old_inhibit_defer_pop + 1, use_insns, no_queue); | |
2242 | ||
2243 | /* Now restore inhibit_defer_pop to its actual original value. */ | |
2244 | OK_DEFER_POP; | |
2245 | } | |
2246 | \f | |
2247 | /* Like emit_library_call except that an extra argument, VALUE, | |
2248 | comes second and says where to store the result. | |
2249 | (If VALUE is zero, the result comes in the function value register.) */ | |
2250 | ||
2251 | void | |
2252 | emit_library_call_value (va_alist) | |
2253 | va_dcl | |
2254 | { | |
2255 | va_list p; | |
2256 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2257 | struct args_size args_size; | |
2258 | /* Size of arguments before any adjustments (such as rounding). */ | |
2259 | struct args_size original_args_size; | |
2260 | register int argnum; | |
2261 | enum machine_mode outmode; | |
2262 | int nargs; | |
2263 | rtx fun; | |
2264 | rtx orgfun; | |
2265 | int inc; | |
2266 | int count; | |
2267 | rtx argblock = 0; | |
2268 | CUMULATIVE_ARGS args_so_far; | |
2269 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; | |
2270 | struct args_size offset; struct args_size size; }; | |
2271 | struct arg *argvec; | |
2272 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
2273 | int no_queue = 0; | |
2274 | rtx use_insns; | |
2275 | rtx value; | |
2276 | rtx mem_value = 0; | |
efd65a8b RS |
2277 | /* library calls are never indirect calls. */ |
2278 | int current_call_is_indirect = 0; | |
322e3e34 RK |
2279 | |
2280 | va_start (p); | |
2281 | orgfun = fun = va_arg (p, rtx); | |
2282 | value = va_arg (p, rtx); | |
2283 | no_queue = va_arg (p, int); | |
2284 | outmode = va_arg (p, enum machine_mode); | |
2285 | nargs = va_arg (p, int); | |
2286 | ||
2287 | /* If this kind of value comes back in memory, | |
2288 | decide where in memory it should come back. */ | |
2289 | if (RETURN_IN_MEMORY (type_for_mode (outmode, 0))) | |
2290 | { | |
2291 | if (GET_CODE (value) == MEM) | |
2292 | mem_value = value; | |
2293 | else | |
2294 | mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0); | |
2295 | } | |
2296 | ||
2297 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
2298 | ||
2299 | /* Copy all the libcall-arguments out of the varargs data | |
2300 | and into a vector ARGVEC. | |
2301 | ||
2302 | Compute how to pass each argument. We only support a very small subset | |
2303 | of the full argument passing conventions to limit complexity here since | |
2304 | library functions shouldn't have many args. */ | |
2305 | ||
2306 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
2307 | ||
2308 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); | |
2309 | ||
2310 | args_size.constant = 0; | |
2311 | args_size.var = 0; | |
2312 | ||
2313 | count = 0; | |
2314 | ||
2315 | /* If there's a structure value address to be passed, | |
2316 | either pass it in the special place, or pass it as an extra argument. */ | |
2317 | if (mem_value) | |
2318 | { | |
2319 | rtx addr = XEXP (mem_value, 0); | |
2320 | ||
2321 | if (! struct_value_rtx) | |
2322 | { | |
2323 | nargs++; | |
2324 | ||
2325 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
2326 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
2327 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
2328 | addr = force_operand (addr, NULL_RTX); | |
2329 | ||
2330 | argvec[count].value = addr; | |
2331 | argvec[count].mode = outmode; | |
2332 | argvec[count].partial = 0; | |
2333 | ||
2334 | argvec[count].reg = FUNCTION_ARG (args_so_far, outmode, NULL_TREE, 1); | |
2335 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
2336 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, outmode, NULL_TREE, 1)) | |
2337 | abort (); | |
2338 | #endif | |
2339 | ||
2340 | locate_and_pad_parm (outmode, NULL_TREE, | |
2341 | argvec[count].reg && argvec[count].partial == 0, | |
2342 | NULL_TREE, &args_size, &argvec[count].offset, | |
2343 | &argvec[count].size); | |
2344 | ||
2345 | ||
2346 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
2347 | #ifdef REG_PARM_STACK_SPACE | |
2348 | || 1 | |
2349 | #endif | |
2350 | ) | |
2351 | args_size.constant += argvec[count].size.constant; | |
2352 | ||
2353 | FUNCTION_ARG_ADVANCE (args_so_far, outmode, (tree)0, 1); | |
2354 | } | |
2355 | } | |
2356 | ||
2357 | for (; count < nargs; count++) | |
2358 | { | |
2359 | rtx val = va_arg (p, rtx); | |
2360 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
2361 | ||
2362 | /* We cannot convert the arg value to the mode the library wants here; | |
2363 | must do it earlier where we know the signedness of the arg. */ | |
2364 | if (mode == BLKmode | |
2365 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
2366 | abort (); | |
2367 | ||
2368 | /* On some machines, there's no way to pass a float to a library fcn. | |
2369 | Pass it as a double instead. */ | |
2370 | #ifdef LIBGCC_NEEDS_DOUBLE | |
2371 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
2372 | val = convert_to_mode (DFmode, val, 0), mode = DFmode; | |
2373 | #endif | |
2374 | ||
2375 | /* There's no need to call protect_from_queue, because | |
2376 | either emit_move_insn or emit_push_insn will do that. */ | |
2377 | ||
2378 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
2379 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
2380 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
2381 | val = force_operand (val, NULL_RTX); | |
2382 | ||
2383 | argvec[count].value = val; | |
2384 | argvec[count].mode = mode; | |
2385 | ||
2386 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
2387 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
2388 | abort (); | |
2389 | #endif | |
2390 | ||
2391 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
2392 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) | |
2393 | abort (); | |
2394 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
2395 | argvec[count].partial | |
2396 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
2397 | #else | |
2398 | argvec[count].partial = 0; | |
2399 | #endif | |
2400 | ||
2401 | locate_and_pad_parm (mode, NULL_TREE, | |
2402 | argvec[count].reg && argvec[count].partial == 0, | |
2403 | NULL_TREE, &args_size, &argvec[count].offset, | |
2404 | &argvec[count].size); | |
2405 | ||
2406 | if (argvec[count].size.var) | |
2407 | abort (); | |
2408 | ||
2409 | #ifndef REG_PARM_STACK_SPACE | |
2410 | if (argvec[count].partial) | |
2411 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
2412 | #endif | |
2413 | ||
2414 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
2415 | #ifdef REG_PARM_STACK_SPACE | |
2416 | || 1 | |
2417 | #endif | |
2418 | ) | |
2419 | args_size.constant += argvec[count].size.constant; | |
2420 | ||
2421 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2422 | /* If this arg is actually passed on the stack, it might be | |
2423 | clobbering something we already put there (this library call might | |
2424 | be inside the evaluation of an argument to a function whose call | |
2425 | requires the stack). This will only occur when the library call | |
2426 | has sufficient args to run out of argument registers. Abort in | |
2427 | this case; if this ever occurs, code must be added to save and | |
2428 | restore the arg slot. */ | |
2429 | ||
2430 | if (argvec[count].reg == 0 || argvec[count].partial != 0) | |
2431 | abort (); | |
2432 | #endif | |
2433 | ||
2434 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); | |
2435 | } | |
2436 | va_end (p); | |
2437 | ||
2438 | /* If this machine requires an external definition for library | |
2439 | functions, write one out. */ | |
2440 | assemble_external_libcall (fun); | |
2441 | ||
2442 | original_args_size = args_size; | |
2443 | #ifdef STACK_BOUNDARY | |
2444 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
2445 | / STACK_BYTES) * STACK_BYTES); | |
2446 | #endif | |
2447 | ||
2448 | #ifdef REG_PARM_STACK_SPACE | |
2449 | args_size.constant = MAX (args_size.constant, | |
2450 | REG_PARM_STACK_SPACE (NULL_TREE)); | |
2451 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
2452 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); | |
2453 | #endif | |
2454 | #endif | |
2455 | ||
2456 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2457 | if (args_size.constant > current_function_outgoing_args_size) | |
2458 | current_function_outgoing_args_size = args_size.constant; | |
2459 | args_size.constant = 0; | |
2460 | #endif | |
2461 | ||
2462 | #ifndef PUSH_ROUNDING | |
2463 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
2464 | #endif | |
2465 | ||
2466 | #ifdef PUSH_ARGS_REVERSED | |
2467 | #ifdef STACK_BOUNDARY | |
2468 | /* If we push args individually in reverse order, perform stack alignment | |
2469 | before the first push (the last arg). */ | |
2470 | if (argblock == 0) | |
2471 | anti_adjust_stack (GEN_INT (args_size.constant | |
2472 | - original_args_size.constant)); | |
2473 | #endif | |
2474 | #endif | |
2475 | ||
2476 | #ifdef PUSH_ARGS_REVERSED | |
2477 | inc = -1; | |
2478 | argnum = nargs - 1; | |
2479 | #else | |
2480 | inc = 1; | |
2481 | argnum = 0; | |
2482 | #endif | |
2483 | ||
2484 | /* Push the args that need to be pushed. */ | |
2485 | ||
2486 | for (count = 0; count < nargs; count++, argnum += inc) | |
2487 | { | |
2488 | register enum machine_mode mode = argvec[argnum].mode; | |
2489 | register rtx val = argvec[argnum].value; | |
2490 | rtx reg = argvec[argnum].reg; | |
2491 | int partial = argvec[argnum].partial; | |
2492 | ||
2493 | if (! (reg != 0 && partial == 0)) | |
2494 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, | |
2495 | argblock, GEN_INT (argvec[count].offset.constant)); | |
2496 | NO_DEFER_POP; | |
2497 | } | |
2498 | ||
2499 | #ifndef PUSH_ARGS_REVERSED | |
2500 | #ifdef STACK_BOUNDARY | |
2501 | /* If we pushed args in forward order, perform stack alignment | |
2502 | after pushing the last arg. */ | |
2503 | if (argblock == 0) | |
2504 | anti_adjust_stack (GEN_INT (args_size.constant | |
2505 | - original_args_size.constant)); | |
2506 | #endif | |
2507 | #endif | |
2508 | ||
2509 | #ifdef PUSH_ARGS_REVERSED | |
2510 | argnum = nargs - 1; | |
2511 | #else | |
2512 | argnum = 0; | |
2513 | #endif | |
2514 | ||
2515 | /* Now load any reg parms into their regs. */ | |
2516 | ||
2517 | if (mem_value != 0 && struct_value_rtx != 0) | |
2518 | emit_move_insn (struct_value_rtx, XEXP (mem_value, 0)); | |
2519 | ||
2520 | for (count = 0; count < nargs; count++, argnum += inc) | |
2521 | { | |
2522 | register enum machine_mode mode = argvec[argnum].mode; | |
2523 | register rtx val = argvec[argnum].value; | |
2524 | rtx reg = argvec[argnum].reg; | |
2525 | int partial = argvec[argnum].partial; | |
2526 | ||
2527 | if (reg != 0 && partial == 0) | |
2528 | emit_move_insn (reg, val); | |
2529 | NO_DEFER_POP; | |
2530 | } | |
2531 | ||
2532 | #if 0 | |
2533 | /* For version 1.37, try deleting this entirely. */ | |
2534 | if (! no_queue) | |
2535 | emit_queue (); | |
2536 | #endif | |
2537 | ||
2538 | /* Any regs containing parms remain in use through the call. */ | |
2539 | start_sequence (); | |
2540 | for (count = 0; count < nargs; count++) | |
2541 | if (argvec[count].reg != 0) | |
2542 | emit_insn (gen_rtx (USE, VOIDmode, argvec[count].reg)); | |
2543 | ||
2544 | use_insns = get_insns (); | |
2545 | end_sequence (); | |
2546 | ||
2547 | fun = prepare_call_address (fun, NULL_TREE, &use_insns); | |
2548 | ||
2549 | /* Don't allow popping to be deferred, since then | |
2550 | cse'ing of library calls could delete a call and leave the pop. */ | |
2551 | NO_DEFER_POP; | |
2552 | ||
2553 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which | |
2554 | will set inhibit_defer_pop to that value. */ | |
2555 | ||
2556 | emit_call_1 (fun, get_identifier (XSTR (orgfun, 0)), args_size.constant, 0, | |
2557 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
2558 | outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX, | |
2559 | old_inhibit_defer_pop + 1, use_insns, no_queue); | |
2560 | ||
2561 | /* Now restore inhibit_defer_pop to its actual original value. */ | |
2562 | OK_DEFER_POP; | |
2563 | ||
2564 | /* Copy the value to the right place. */ | |
2565 | if (outmode != VOIDmode) | |
2566 | { | |
2567 | if (mem_value) | |
2568 | { | |
2569 | if (value == 0) | |
2570 | value = hard_libcall_value (outmode); | |
2571 | if (value != mem_value) | |
2572 | emit_move_insn (value, mem_value); | |
2573 | } | |
2574 | else if (value != 0) | |
2575 | emit_move_insn (value, hard_libcall_value (outmode)); | |
2576 | } | |
2577 | } | |
2578 | \f | |
51bbfa0c RS |
2579 | #if 0 |
2580 | /* Return an rtx which represents a suitable home on the stack | |
2581 | given TYPE, the type of the argument looking for a home. | |
2582 | This is called only for BLKmode arguments. | |
2583 | ||
2584 | SIZE is the size needed for this target. | |
2585 | ARGS_ADDR is the address of the bottom of the argument block for this call. | |
2586 | OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless | |
2587 | if this machine uses push insns. */ | |
2588 | ||
2589 | static rtx | |
2590 | target_for_arg (type, size, args_addr, offset) | |
2591 | tree type; | |
2592 | rtx size; | |
2593 | rtx args_addr; | |
2594 | struct args_size offset; | |
2595 | { | |
2596 | rtx target; | |
2597 | rtx offset_rtx = ARGS_SIZE_RTX (offset); | |
2598 | ||
2599 | /* We do not call memory_address if possible, | |
2600 | because we want to address as close to the stack | |
2601 | as possible. For non-variable sized arguments, | |
2602 | this will be stack-pointer relative addressing. */ | |
2603 | if (GET_CODE (offset_rtx) == CONST_INT) | |
2604 | target = plus_constant (args_addr, INTVAL (offset_rtx)); | |
2605 | else | |
2606 | { | |
2607 | /* I have no idea how to guarantee that this | |
2608 | will work in the presence of register parameters. */ | |
2609 | target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx); | |
2610 | target = memory_address (QImode, target); | |
2611 | } | |
2612 | ||
2613 | return gen_rtx (MEM, BLKmode, target); | |
2614 | } | |
2615 | #endif | |
2616 | \f | |
2617 | /* Store a single argument for a function call | |
2618 | into the register or memory area where it must be passed. | |
2619 | *ARG describes the argument value and where to pass it. | |
2620 | ||
2621 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 2622 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
2623 | |
2624 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
2625 | so must be careful about how the stack is used. | |
2626 | ||
2627 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
2628 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
2629 | that we need not worry about saving and restoring the stack. | |
2630 | ||
2631 | FNDECL is the declaration of the function we are calling. */ | |
2632 | ||
2633 | static void | |
6f90e075 JW |
2634 | store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl, |
2635 | reg_parm_stack_space) | |
51bbfa0c RS |
2636 | struct arg_data *arg; |
2637 | rtx argblock; | |
2638 | int may_be_alloca; | |
2639 | int variable_size; | |
2640 | tree fndecl; | |
6f90e075 | 2641 | int reg_parm_stack_space; |
51bbfa0c RS |
2642 | { |
2643 | register tree pval = arg->tree_value; | |
2644 | rtx reg = 0; | |
2645 | int partial = 0; | |
2646 | int used = 0; | |
2647 | int i, lower_bound, upper_bound; | |
2648 | ||
2649 | if (TREE_CODE (pval) == ERROR_MARK) | |
2650 | return; | |
2651 | ||
2652 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2653 | /* If this is being stored into a pre-allocated, fixed-size, stack area, | |
2654 | save any previous data at that location. */ | |
2655 | if (argblock && ! variable_size && arg->stack) | |
2656 | { | |
2657 | #ifdef ARGS_GROW_DOWNWARD | |
2658 | /* stack_slot is negative, but we want to index stack_usage_map */ | |
2659 | /* with positive values. */ | |
2660 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
2661 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
2662 | else | |
2663 | abort (); | |
2664 | ||
2665 | lower_bound = upper_bound - arg->size.constant; | |
2666 | #else | |
2667 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
2668 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
2669 | else | |
2670 | lower_bound = 0; | |
2671 | ||
2672 | upper_bound = lower_bound + arg->size.constant; | |
2673 | #endif | |
2674 | ||
2675 | for (i = lower_bound; i < upper_bound; i++) | |
2676 | if (stack_usage_map[i] | |
2677 | #ifdef REG_PARM_STACK_SPACE | |
2678 | /* Don't store things in the fixed argument area at this point; | |
2679 | it has already been saved. */ | |
6f90e075 | 2680 | && i > reg_parm_stack_space |
51bbfa0c RS |
2681 | #endif |
2682 | ) | |
2683 | break; | |
2684 | ||
2685 | if (i != upper_bound) | |
2686 | { | |
2687 | /* We need to make a save area. See what mode we can make it. */ | |
2688 | enum machine_mode save_mode | |
2689 | = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); | |
2690 | rtx stack_area | |
2691 | = gen_rtx (MEM, save_mode, | |
2692 | memory_address (save_mode, XEXP (arg->stack_slot, 0))); | |
2693 | ||
2694 | if (save_mode == BLKmode) | |
2695 | { | |
2696 | arg->save_area = assign_stack_temp (BLKmode, | |
2697 | arg->size.constant, 1); | |
2698 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
e5d70561 | 2699 | GEN_INT (arg->size.constant), |
51bbfa0c RS |
2700 | PARM_BOUNDARY / BITS_PER_UNIT); |
2701 | } | |
2702 | else | |
2703 | { | |
2704 | arg->save_area = gen_reg_rtx (save_mode); | |
2705 | emit_move_insn (arg->save_area, stack_area); | |
2706 | } | |
2707 | } | |
2708 | } | |
2709 | #endif | |
2710 | ||
2711 | /* If this isn't going to be placed on both the stack and in registers, | |
2712 | set up the register and number of words. */ | |
2713 | if (! arg->pass_on_stack) | |
2714 | reg = arg->reg, partial = arg->partial; | |
2715 | ||
2716 | if (reg != 0 && partial == 0) | |
2717 | /* Being passed entirely in a register. We shouldn't be called in | |
2718 | this case. */ | |
2719 | abort (); | |
2720 | ||
4ab56118 RK |
2721 | #ifdef STRICT_ALIGNMENT |
2722 | /* If this arg needs special alignment, don't load the registers | |
2723 | here. */ | |
2724 | if (arg->n_aligned_regs != 0) | |
2725 | reg = 0; | |
2726 | #endif | |
2727 | ||
51bbfa0c RS |
2728 | /* If this is being partially passed in a register, but multiple locations |
2729 | are specified, we assume that the one partially used is the one that is | |
2730 | listed first. */ | |
2731 | if (reg && GET_CODE (reg) == EXPR_LIST) | |
2732 | reg = XEXP (reg, 0); | |
2733 | ||
4ab56118 | 2734 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
2735 | it directly into its stack slot. Otherwise, we can. */ |
2736 | if (arg->value == 0) | |
d64f5a78 RS |
2737 | { |
2738 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2739 | /* stack_arg_under_construction is nonzero if a function argument is | |
2740 | being evaluated directly into the outgoing argument list and | |
2741 | expand_call must take special action to preserve the argument list | |
2742 | if it is called recursively. | |
2743 | ||
2744 | For scalar function arguments stack_usage_map is sufficient to | |
2745 | determine which stack slots must be saved and restored. Scalar | |
2746 | arguments in general have pass_on_stack == 0. | |
2747 | ||
2748 | If this argument is initialized by a function which takes the | |
2749 | address of the argument (a C++ constructor or a C function | |
2750 | returning a BLKmode structure), then stack_usage_map is | |
2751 | insufficient and expand_call must push the stack around the | |
2752 | function call. Such arguments have pass_on_stack == 1. | |
2753 | ||
2754 | Note that it is always safe to set stack_arg_under_construction, | |
2755 | but this generates suboptimal code if set when not needed. */ | |
2756 | ||
2757 | if (arg->pass_on_stack) | |
2758 | stack_arg_under_construction++; | |
2759 | #endif | |
e5d70561 RK |
2760 | arg->value = expand_expr (pval, partial ? NULL_RTX : arg->stack, |
2761 | VOIDmode, 0); | |
1efe6448 RK |
2762 | |
2763 | /* If we are promoting object (or for any other reason) the mode | |
2764 | doesn't agree, convert the mode. */ | |
2765 | ||
2766 | if (GET_MODE (arg->value) != VOIDmode | |
2767 | && GET_MODE (arg->value) != arg->mode) | |
2768 | arg->value = convert_to_mode (arg->mode, arg->value, arg->unsignedp); | |
2769 | ||
d64f5a78 RS |
2770 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2771 | if (arg->pass_on_stack) | |
2772 | stack_arg_under_construction--; | |
2773 | #endif | |
2774 | } | |
51bbfa0c RS |
2775 | |
2776 | /* Don't allow anything left on stack from computation | |
2777 | of argument to alloca. */ | |
2778 | if (may_be_alloca) | |
2779 | do_pending_stack_adjust (); | |
2780 | ||
2781 | if (arg->value == arg->stack) | |
2782 | /* If the value is already in the stack slot, we are done. */ | |
2783 | ; | |
1efe6448 | 2784 | else if (arg->mode != BLKmode) |
51bbfa0c RS |
2785 | { |
2786 | register int size; | |
2787 | ||
2788 | /* Argument is a scalar, not entirely passed in registers. | |
2789 | (If part is passed in registers, arg->partial says how much | |
2790 | and emit_push_insn will take care of putting it there.) | |
2791 | ||
2792 | Push it, and if its size is less than the | |
2793 | amount of space allocated to it, | |
2794 | also bump stack pointer by the additional space. | |
2795 | Note that in C the default argument promotions | |
2796 | will prevent such mismatches. */ | |
2797 | ||
1efe6448 | 2798 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
2799 | /* Compute how much space the push instruction will push. |
2800 | On many machines, pushing a byte will advance the stack | |
2801 | pointer by a halfword. */ | |
2802 | #ifdef PUSH_ROUNDING | |
2803 | size = PUSH_ROUNDING (size); | |
2804 | #endif | |
2805 | used = size; | |
2806 | ||
2807 | /* Compute how much space the argument should get: | |
2808 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 2809 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
2810 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
2811 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
2812 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
2813 | ||
2814 | /* This isn't already where we want it on the stack, so put it there. | |
2815 | This can either be done with push or copy insns. */ | |
ccf5d244 RK |
2816 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
2817 | 0, partial, reg, used - size, | |
2818 | argblock, ARGS_SIZE_RTX (arg->offset)); | |
51bbfa0c RS |
2819 | } |
2820 | else | |
2821 | { | |
2822 | /* BLKmode, at least partly to be pushed. */ | |
2823 | ||
2824 | register int excess; | |
2825 | rtx size_rtx; | |
2826 | ||
2827 | /* Pushing a nonscalar. | |
2828 | If part is passed in registers, PARTIAL says how much | |
2829 | and emit_push_insn will take care of putting it there. */ | |
2830 | ||
2831 | /* Round its size up to a multiple | |
2832 | of the allocation unit for arguments. */ | |
2833 | ||
2834 | if (arg->size.var != 0) | |
2835 | { | |
2836 | excess = 0; | |
2837 | size_rtx = ARGS_SIZE_RTX (arg->size); | |
2838 | } | |
2839 | else | |
2840 | { | |
51bbfa0c RS |
2841 | /* PUSH_ROUNDING has no effect on us, because |
2842 | emit_push_insn for BLKmode is careful to avoid it. */ | |
0cf91217 | 2843 | excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) |
51bbfa0c | 2844 | + partial * UNITS_PER_WORD); |
e4f93898 | 2845 | size_rtx = expr_size (pval); |
51bbfa0c RS |
2846 | } |
2847 | ||
1efe6448 | 2848 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
51bbfa0c RS |
2849 | TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial, |
2850 | reg, excess, argblock, ARGS_SIZE_RTX (arg->offset)); | |
2851 | } | |
2852 | ||
2853 | ||
2854 | /* Unless this is a partially-in-register argument, the argument is now | |
2855 | in the stack. | |
2856 | ||
2857 | ??? Note that this can change arg->value from arg->stack to | |
2858 | arg->stack_slot and it matters when they are not the same. | |
2859 | It isn't totally clear that this is correct in all cases. */ | |
2860 | if (partial == 0) | |
2861 | arg->value = arg->stack_slot; | |
2862 | ||
2863 | /* Once we have pushed something, pops can't safely | |
2864 | be deferred during the rest of the arguments. */ | |
2865 | NO_DEFER_POP; | |
2866 | ||
2867 | /* ANSI doesn't require a sequence point here, | |
2868 | but PCC has one, so this will avoid some problems. */ | |
2869 | emit_queue (); | |
2870 | ||
2871 | /* Free any temporary slots made in processing this argument. */ | |
2872 | free_temp_slots (); | |
2873 | ||
2874 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2875 | /* Now mark the segment we just used. */ | |
2876 | if (argblock && ! variable_size && arg->stack) | |
2877 | for (i = lower_bound; i < upper_bound; i++) | |
2878 | stack_usage_map[i] = 1; | |
2879 | #endif | |
2880 | } |