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51bbfa0c | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
ebef2728 | 2 | Copyright (C) 1989, 1992, 1993, 1994 Free Software Foundation, Inc. |
51bbfa0c RS |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
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" | |
4f90e4a0 | 25 | #ifdef __STDC__ |
04fe4385 | 26 | #include <stdarg.h> |
4f90e4a0 | 27 | #else |
04fe4385 | 28 | #include <varargs.h> |
4f90e4a0 | 29 | #endif |
51bbfa0c RS |
30 | #include "insn-flags.h" |
31 | ||
32 | /* Decide whether a function's arguments should be processed | |
bbc8a071 RK |
33 | from first to last or from last to first. |
34 | ||
35 | They should if the stack and args grow in opposite directions, but | |
36 | only if we have push insns. */ | |
51bbfa0c | 37 | |
51bbfa0c | 38 | #ifdef PUSH_ROUNDING |
bbc8a071 | 39 | |
40083ddf | 40 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
51bbfa0c RS |
41 | #define PUSH_ARGS_REVERSED /* If it's last to first */ |
42 | #endif | |
bbc8a071 | 43 | |
51bbfa0c RS |
44 | #endif |
45 | ||
46 | /* Like STACK_BOUNDARY but in units of bytes, not bits. */ | |
47 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
48 | ||
49 | /* Data structure and subroutines used within expand_call. */ | |
50 | ||
51 | struct arg_data | |
52 | { | |
53 | /* Tree node for this argument. */ | |
54 | tree tree_value; | |
1efe6448 RK |
55 | /* Mode for value; TYPE_MODE unless promoted. */ |
56 | enum machine_mode mode; | |
51bbfa0c RS |
57 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
58 | rtx value; | |
59 | /* Initially-compute RTL value for argument; only for const functions. */ | |
60 | rtx initial_value; | |
61 | /* Register to pass this argument in, 0 if passed on stack, or an | |
62 | EXPR_LIST if the arg is to be copied into multiple different | |
63 | registers. */ | |
64 | rtx reg; | |
84b55618 RK |
65 | /* If REG was promoted from the actual mode of the argument expression, |
66 | indicates whether the promotion is sign- or zero-extended. */ | |
67 | int unsignedp; | |
51bbfa0c RS |
68 | /* Number of registers to use. 0 means put the whole arg in registers. |
69 | Also 0 if not passed in registers. */ | |
70 | int partial; | |
d64f5a78 RS |
71 | /* Non-zero if argument must be passed on stack. |
72 | Note that some arguments may be passed on the stack | |
73 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
74 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c RS |
75 | int pass_on_stack; |
76 | /* Offset of this argument from beginning of stack-args. */ | |
77 | struct args_size offset; | |
78 | /* Similar, but offset to the start of the stack slot. Different from | |
79 | OFFSET if this arg pads downward. */ | |
80 | struct args_size slot_offset; | |
81 | /* Size of this argument on the stack, rounded up for any padding it gets, | |
82 | parts of the argument passed in registers do not count. | |
83 | If REG_PARM_STACK_SPACE is defined, then register parms | |
84 | are counted here as well. */ | |
85 | struct args_size size; | |
86 | /* Location on the stack at which parameter should be stored. The store | |
87 | has already been done if STACK == VALUE. */ | |
88 | rtx stack; | |
89 | /* Location on the stack of the start of this argument slot. This can | |
90 | differ from STACK if this arg pads downward. This location is known | |
91 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
92 | rtx stack_slot; | |
93 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
94 | /* Place that this stack area has been saved, if needed. */ | |
95 | rtx save_area; | |
96 | #endif | |
4ab56118 RK |
97 | #ifdef STRICT_ALIGNMENT |
98 | /* If an argument's alignment does not permit direct copying into registers, | |
99 | copy in smaller-sized pieces into pseudos. These are stored in a | |
100 | block pointed to by this field. The next field says how many | |
101 | word-sized pseudos we made. */ | |
102 | rtx *aligned_regs; | |
103 | int n_aligned_regs; | |
104 | #endif | |
51bbfa0c RS |
105 | }; |
106 | ||
107 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
b94301c2 | 108 | /* A vector of one char per byte of stack space. A byte if non-zero if |
51bbfa0c RS |
109 | the corresponding stack location has been used. |
110 | This vector is used to prevent a function call within an argument from | |
111 | clobbering any stack already set up. */ | |
112 | static char *stack_usage_map; | |
113 | ||
114 | /* Size of STACK_USAGE_MAP. */ | |
115 | static int highest_outgoing_arg_in_use; | |
2f4aa534 RS |
116 | |
117 | /* stack_arg_under_construction is nonzero when an argument may be | |
118 | initialized with a constructor call (including a C function that | |
119 | returns a BLKmode struct) and expand_call must take special action | |
120 | to make sure the object being constructed does not overlap the | |
121 | argument list for the constructor call. */ | |
122 | int stack_arg_under_construction; | |
51bbfa0c RS |
123 | #endif |
124 | ||
322e3e34 | 125 | static int calls_function PROTO((tree, int)); |
9f4d9f6c | 126 | static int calls_function_1 PROTO((tree, int)); |
322e3e34 RK |
127 | static void emit_call_1 PROTO((rtx, tree, int, int, rtx, rtx, int, |
128 | rtx, int)); | |
129 | static void store_one_arg PROTO ((struct arg_data *, rtx, int, int, | |
130 | tree, int)); | |
51bbfa0c | 131 | \f |
1ce0cb53 JW |
132 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
133 | `alloca'. | |
134 | ||
135 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
136 | Actually, we only need return 1 if evaluating EXP would require pushing | |
137 | arguments on the stack, but that is too difficult to compute, so we just | |
138 | assume any function call might require the stack. */ | |
51bbfa0c | 139 | |
1c8d7aef RS |
140 | static tree calls_function_save_exprs; |
141 | ||
51bbfa0c | 142 | static int |
1ce0cb53 | 143 | calls_function (exp, which) |
51bbfa0c | 144 | tree exp; |
1ce0cb53 | 145 | int which; |
1c8d7aef RS |
146 | { |
147 | int val; | |
148 | calls_function_save_exprs = 0; | |
149 | val = calls_function_1 (exp, which); | |
150 | calls_function_save_exprs = 0; | |
151 | return val; | |
152 | } | |
153 | ||
154 | static int | |
155 | calls_function_1 (exp, which) | |
156 | tree exp; | |
157 | int which; | |
51bbfa0c RS |
158 | { |
159 | register int i; | |
0207efa2 RK |
160 | enum tree_code code = TREE_CODE (exp); |
161 | int type = TREE_CODE_CLASS (code); | |
162 | int length = tree_code_length[(int) code]; | |
51bbfa0c | 163 | |
0207efa2 RK |
164 | /* If this code is langauge-specific, we don't know what it will do. */ |
165 | if ((int) code >= NUM_TREE_CODES) | |
166 | return 1; | |
51bbfa0c | 167 | |
0207efa2 | 168 | /* Only expressions and references can contain calls. */ |
3b59a331 RS |
169 | if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r' |
170 | && type != 'b') | |
51bbfa0c RS |
171 | return 0; |
172 | ||
0207efa2 | 173 | switch (code) |
51bbfa0c RS |
174 | { |
175 | case CALL_EXPR: | |
1ce0cb53 JW |
176 | if (which == 0) |
177 | return 1; | |
178 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
179 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
0207efa2 RK |
180 | == FUNCTION_DECL)) |
181 | { | |
182 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
183 | ||
184 | if ((DECL_BUILT_IN (fndecl) | |
185 | && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_ALLOCA) | |
186 | || (DECL_SAVED_INSNS (fndecl) | |
187 | && (FUNCTION_FLAGS (DECL_SAVED_INSNS (fndecl)) | |
188 | & FUNCTION_FLAGS_CALLS_ALLOCA))) | |
189 | return 1; | |
190 | } | |
51bbfa0c RS |
191 | |
192 | /* Third operand is RTL. */ | |
193 | length = 2; | |
194 | break; | |
195 | ||
196 | case SAVE_EXPR: | |
197 | if (SAVE_EXPR_RTL (exp) != 0) | |
198 | return 0; | |
1c8d7aef RS |
199 | if (value_member (exp, calls_function_save_exprs)) |
200 | return 0; | |
201 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, | |
202 | calls_function_save_exprs); | |
203 | return (TREE_OPERAND (exp, 0) != 0 | |
204 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); | |
51bbfa0c RS |
205 | |
206 | case BLOCK: | |
ef03bc85 CH |
207 | { |
208 | register tree local; | |
209 | ||
210 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1ce0cb53 | 211 | if (DECL_INITIAL (local) != 0 |
1c8d7aef | 212 | && calls_function_1 (DECL_INITIAL (local), which)) |
ef03bc85 CH |
213 | return 1; |
214 | } | |
215 | { | |
216 | register tree subblock; | |
217 | ||
218 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
219 | subblock; | |
220 | subblock = TREE_CHAIN (subblock)) | |
1c8d7aef | 221 | if (calls_function_1 (subblock, which)) |
ef03bc85 CH |
222 | return 1; |
223 | } | |
224 | return 0; | |
51bbfa0c RS |
225 | |
226 | case METHOD_CALL_EXPR: | |
227 | length = 3; | |
228 | break; | |
229 | ||
230 | case WITH_CLEANUP_EXPR: | |
231 | length = 1; | |
232 | break; | |
233 | ||
234 | case RTL_EXPR: | |
235 | return 0; | |
236 | } | |
237 | ||
238 | for (i = 0; i < length; i++) | |
239 | if (TREE_OPERAND (exp, i) != 0 | |
1c8d7aef | 240 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
51bbfa0c RS |
241 | return 1; |
242 | ||
243 | return 0; | |
244 | } | |
245 | \f | |
246 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
247 | and return that as an rtx. Also load the static chain register | |
248 | if FNDECL is a nested function. | |
249 | ||
250 | USE_INSNS points to a variable holding a chain of USE insns | |
251 | to which a USE of the static chain | |
252 | register should be added, if required. */ | |
253 | ||
03dacb02 | 254 | rtx |
01368078 | 255 | prepare_call_address (funexp, fndecl, use_insns, reg_parm_seen) |
51bbfa0c RS |
256 | rtx funexp; |
257 | tree fndecl; | |
258 | rtx *use_insns; | |
01368078 | 259 | int reg_parm_seen; |
51bbfa0c RS |
260 | { |
261 | rtx static_chain_value = 0; | |
262 | ||
263 | funexp = protect_from_queue (funexp, 0); | |
264 | ||
265 | if (fndecl != 0) | |
266 | /* Get possible static chain value for nested function in C. */ | |
267 | static_chain_value = lookup_static_chain (fndecl); | |
268 | ||
269 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
270 | but not for a constant address if -fno-function-cse. */ | |
271 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 RK |
272 | funexp = |
273 | #ifdef SMALL_REGISTER_CLASSES | |
274 | /* If we are using registers for parameters, force the | |
275 | function address into a register now. */ | |
276 | reg_parm_seen ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
277 | : | |
278 | #endif | |
279 | memory_address (FUNCTION_MODE, funexp); | |
51bbfa0c RS |
280 | else |
281 | { | |
282 | #ifndef NO_FUNCTION_CSE | |
283 | if (optimize && ! flag_no_function_cse) | |
284 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
285 | if (fndecl != current_function_decl) | |
286 | #endif | |
287 | funexp = force_reg (Pmode, funexp); | |
288 | #endif | |
289 | } | |
290 | ||
291 | if (static_chain_value != 0) | |
292 | { | |
293 | emit_move_insn (static_chain_rtx, static_chain_value); | |
294 | ||
295 | /* Put the USE insn in the chain we were passed. It will later be | |
296 | output immediately in front of the CALL insn. */ | |
297 | push_to_sequence (*use_insns); | |
298 | emit_insn (gen_rtx (USE, VOIDmode, static_chain_rtx)); | |
299 | *use_insns = get_insns (); | |
300 | end_sequence (); | |
301 | } | |
302 | ||
303 | return funexp; | |
304 | } | |
305 | ||
306 | /* Generate instructions to call function FUNEXP, | |
307 | and optionally pop the results. | |
308 | The CALL_INSN is the first insn generated. | |
309 | ||
310 | FUNTYPE is the data type of the function, or, for a library call, | |
311 | the identifier for the name of the call. This is given to the | |
312 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. | |
313 | ||
314 | STACK_SIZE is the number of bytes of arguments on the stack, | |
315 | rounded up to STACK_BOUNDARY; zero if the size is variable. | |
316 | This is both to put into the call insn and | |
317 | to generate explicit popping code if necessary. | |
318 | ||
319 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
320 | It is zero if this call doesn't want a structure value. | |
321 | ||
322 | NEXT_ARG_REG is the rtx that results from executing | |
323 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
324 | just after all the args have had their registers assigned. | |
325 | This could be whatever you like, but normally it is the first | |
326 | arg-register beyond those used for args in this call, | |
327 | or 0 if all the arg-registers are used in this call. | |
328 | It is passed on to `gen_call' so you can put this info in the call insn. | |
329 | ||
330 | VALREG is a hard register in which a value is returned, | |
331 | or 0 if the call does not return a value. | |
332 | ||
333 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
334 | the args to this call were processed. | |
335 | We restore `inhibit_defer_pop' to that value. | |
336 | ||
337 | USE_INSNS is a chain of USE insns to be emitted immediately before | |
338 | the actual CALL insn. | |
339 | ||
340 | IS_CONST is true if this is a `const' call. */ | |
341 | ||
322e3e34 | 342 | static void |
51bbfa0c RS |
343 | emit_call_1 (funexp, funtype, stack_size, struct_value_size, next_arg_reg, |
344 | valreg, old_inhibit_defer_pop, use_insns, is_const) | |
345 | rtx funexp; | |
346 | tree funtype; | |
347 | int stack_size; | |
348 | int struct_value_size; | |
349 | rtx next_arg_reg; | |
350 | rtx valreg; | |
351 | int old_inhibit_defer_pop; | |
352 | rtx use_insns; | |
353 | int is_const; | |
354 | { | |
e5d70561 RK |
355 | rtx stack_size_rtx = GEN_INT (stack_size); |
356 | rtx struct_value_size_rtx = GEN_INT (struct_value_size); | |
51bbfa0c RS |
357 | rtx call_insn; |
358 | int already_popped = 0; | |
359 | ||
360 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
361 | and we don't want to load it into a register as an optimization, | |
362 | because prepare_call_address already did it if it should be done. */ | |
363 | if (GET_CODE (funexp) != SYMBOL_REF) | |
364 | funexp = memory_address (FUNCTION_MODE, funexp); | |
365 | ||
366 | #ifndef ACCUMULATE_OUTGOING_ARGS | |
367 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) | |
368 | if (HAVE_call_pop && HAVE_call_value_pop | |
369 | && (RETURN_POPS_ARGS (funtype, stack_size) > 0 || stack_size == 0)) | |
370 | { | |
e5d70561 | 371 | rtx n_pop = GEN_INT (RETURN_POPS_ARGS (funtype, stack_size)); |
51bbfa0c RS |
372 | rtx pat; |
373 | ||
374 | /* If this subroutine pops its own args, record that in the call insn | |
375 | if possible, for the sake of frame pointer elimination. */ | |
376 | if (valreg) | |
377 | pat = gen_call_value_pop (valreg, | |
378 | gen_rtx (MEM, FUNCTION_MODE, funexp), | |
379 | stack_size_rtx, next_arg_reg, n_pop); | |
380 | else | |
381 | pat = gen_call_pop (gen_rtx (MEM, FUNCTION_MODE, funexp), | |
382 | stack_size_rtx, next_arg_reg, n_pop); | |
383 | ||
384 | emit_call_insn (pat); | |
385 | already_popped = 1; | |
386 | } | |
387 | else | |
388 | #endif | |
389 | #endif | |
390 | ||
391 | #if defined (HAVE_call) && defined (HAVE_call_value) | |
392 | if (HAVE_call && HAVE_call_value) | |
393 | { | |
394 | if (valreg) | |
395 | emit_call_insn (gen_call_value (valreg, | |
396 | gen_rtx (MEM, FUNCTION_MODE, funexp), | |
e992302c BK |
397 | stack_size_rtx, next_arg_reg, |
398 | NULL_RTX)); | |
51bbfa0c RS |
399 | else |
400 | emit_call_insn (gen_call (gen_rtx (MEM, FUNCTION_MODE, funexp), | |
401 | stack_size_rtx, next_arg_reg, | |
402 | struct_value_size_rtx)); | |
403 | } | |
404 | else | |
405 | #endif | |
406 | abort (); | |
407 | ||
408 | /* Find the CALL insn we just emitted and write the USE insns before it. */ | |
409 | for (call_insn = get_last_insn (); | |
410 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
411 | call_insn = PREV_INSN (call_insn)) | |
412 | ; | |
413 | ||
414 | if (! call_insn) | |
415 | abort (); | |
416 | ||
417 | /* Put the USE insns before the CALL. */ | |
418 | emit_insns_before (use_insns, call_insn); | |
419 | ||
420 | /* If this is a const call, then set the insn's unchanging bit. */ | |
421 | if (is_const) | |
422 | CONST_CALL_P (call_insn) = 1; | |
423 | ||
b1e64e0d RS |
424 | /* Restore this now, so that we do defer pops for this call's args |
425 | if the context of the call as a whole permits. */ | |
426 | inhibit_defer_pop = old_inhibit_defer_pop; | |
427 | ||
51bbfa0c RS |
428 | #ifndef ACCUMULATE_OUTGOING_ARGS |
429 | /* If returning from the subroutine does not automatically pop the args, | |
430 | we need an instruction to pop them sooner or later. | |
431 | Perhaps do it now; perhaps just record how much space to pop later. | |
432 | ||
433 | If returning from the subroutine does pop the args, indicate that the | |
434 | stack pointer will be changed. */ | |
435 | ||
436 | if (stack_size != 0 && RETURN_POPS_ARGS (funtype, stack_size) > 0) | |
437 | { | |
438 | if (!already_popped) | |
439 | emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx)); | |
440 | stack_size -= RETURN_POPS_ARGS (funtype, stack_size); | |
e5d70561 | 441 | stack_size_rtx = GEN_INT (stack_size); |
51bbfa0c RS |
442 | } |
443 | ||
444 | if (stack_size != 0) | |
445 | { | |
70a73141 | 446 | if (flag_defer_pop && inhibit_defer_pop == 0 && !is_const) |
51bbfa0c RS |
447 | pending_stack_adjust += stack_size; |
448 | else | |
449 | adjust_stack (stack_size_rtx); | |
450 | } | |
451 | #endif | |
452 | } | |
453 | ||
454 | /* Generate all the code for a function call | |
455 | and return an rtx for its value. | |
456 | Store the value in TARGET (specified as an rtx) if convenient. | |
457 | If the value is stored in TARGET then TARGET is returned. | |
458 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
459 | ||
460 | rtx | |
8129842c | 461 | expand_call (exp, target, ignore) |
51bbfa0c RS |
462 | tree exp; |
463 | rtx target; | |
464 | int ignore; | |
51bbfa0c RS |
465 | { |
466 | /* List of actual parameters. */ | |
467 | tree actparms = TREE_OPERAND (exp, 1); | |
468 | /* RTX for the function to be called. */ | |
469 | rtx funexp; | |
470 | /* Tree node for the function to be called (not the address!). */ | |
471 | tree funtree; | |
472 | /* Data type of the function. */ | |
473 | tree funtype; | |
474 | /* Declaration of the function being called, | |
475 | or 0 if the function is computed (not known by name). */ | |
476 | tree fndecl = 0; | |
477 | char *name = 0; | |
478 | ||
479 | /* Register in which non-BLKmode value will be returned, | |
480 | or 0 if no value or if value is BLKmode. */ | |
481 | rtx valreg; | |
482 | /* Address where we should return a BLKmode value; | |
483 | 0 if value not BLKmode. */ | |
484 | rtx structure_value_addr = 0; | |
485 | /* Nonzero if that address is being passed by treating it as | |
486 | an extra, implicit first parameter. Otherwise, | |
487 | it is passed by being copied directly into struct_value_rtx. */ | |
488 | int structure_value_addr_parm = 0; | |
489 | /* Size of aggregate value wanted, or zero if none wanted | |
490 | or if we are using the non-reentrant PCC calling convention | |
491 | or expecting the value in registers. */ | |
492 | int struct_value_size = 0; | |
493 | /* Nonzero if called function returns an aggregate in memory PCC style, | |
494 | by returning the address of where to find it. */ | |
495 | int pcc_struct_value = 0; | |
496 | ||
497 | /* Number of actual parameters in this call, including struct value addr. */ | |
498 | int num_actuals; | |
499 | /* Number of named args. Args after this are anonymous ones | |
500 | and they must all go on the stack. */ | |
501 | int n_named_args; | |
502 | /* Count arg position in order args appear. */ | |
503 | int argpos; | |
504 | ||
505 | /* Vector of information about each argument. | |
506 | Arguments are numbered in the order they will be pushed, | |
507 | not the order they are written. */ | |
508 | struct arg_data *args; | |
509 | ||
510 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
511 | struct args_size args_size; | |
512 | /* Size of arguments before any adjustments (such as rounding). */ | |
513 | struct args_size original_args_size; | |
514 | /* Data on reg parms scanned so far. */ | |
515 | CUMULATIVE_ARGS args_so_far; | |
516 | /* Nonzero if a reg parm has been scanned. */ | |
517 | int reg_parm_seen; | |
efd65a8b RS |
518 | /* Nonzero if this is an indirect function call. */ |
519 | int current_call_is_indirect = 0; | |
51bbfa0c RS |
520 | |
521 | /* Nonzero if we must avoid push-insns in the args for this call. | |
522 | If stack space is allocated for register parameters, but not by the | |
523 | caller, then it is preallocated in the fixed part of the stack frame. | |
524 | So the entire argument block must then be preallocated (i.e., we | |
525 | ignore PUSH_ROUNDING in that case). */ | |
526 | ||
527 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
528 | int must_preallocate = 1; | |
529 | #else | |
530 | #ifdef PUSH_ROUNDING | |
531 | int must_preallocate = 0; | |
532 | #else | |
533 | int must_preallocate = 1; | |
534 | #endif | |
535 | #endif | |
536 | ||
f72aed24 | 537 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
538 | int reg_parm_stack_space = 0; |
539 | ||
51bbfa0c RS |
540 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ |
541 | int inc; | |
542 | /* Address of space preallocated for stack parms | |
543 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
544 | rtx argblock = 0; | |
545 | ||
546 | /* Nonzero if it is plausible that this is a call to alloca. */ | |
547 | int may_be_alloca; | |
548 | /* Nonzero if this is a call to setjmp or a related function. */ | |
549 | int returns_twice; | |
550 | /* Nonzero if this is a call to `longjmp'. */ | |
551 | int is_longjmp; | |
552 | /* Nonzero if this is a call to an inline function. */ | |
553 | int is_integrable = 0; | |
51bbfa0c RS |
554 | /* Nonzero if this is a call to a `const' function. |
555 | Note that only explicitly named functions are handled as `const' here. */ | |
556 | int is_const = 0; | |
557 | /* Nonzero if this is a call to a `volatile' function. */ | |
558 | int is_volatile = 0; | |
559 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) | |
560 | /* Define the boundary of the register parm stack space that needs to be | |
561 | save, if any. */ | |
562 | int low_to_save = -1, high_to_save; | |
563 | rtx save_area = 0; /* Place that it is saved */ | |
564 | #endif | |
565 | ||
566 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
567 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
568 | char *initial_stack_usage_map = stack_usage_map; | |
569 | #endif | |
570 | ||
571 | rtx old_stack_level = 0; | |
79be3418 | 572 | int old_pending_adj = 0; |
2f4aa534 | 573 | int old_stack_arg_under_construction; |
51bbfa0c RS |
574 | int old_inhibit_defer_pop = inhibit_defer_pop; |
575 | tree old_cleanups = cleanups_this_call; | |
51bbfa0c | 576 | rtx use_insns = 0; |
51bbfa0c | 577 | register tree p; |
4ab56118 | 578 | register int i, j; |
51bbfa0c RS |
579 | |
580 | /* See if we can find a DECL-node for the actual function. | |
581 | As a result, decide whether this is a call to an integrable function. */ | |
582 | ||
583 | p = TREE_OPERAND (exp, 0); | |
584 | if (TREE_CODE (p) == ADDR_EXPR) | |
585 | { | |
586 | fndecl = TREE_OPERAND (p, 0); | |
587 | if (TREE_CODE (fndecl) != FUNCTION_DECL) | |
fdff8c6d | 588 | fndecl = 0; |
51bbfa0c RS |
589 | else |
590 | { | |
591 | if (!flag_no_inline | |
592 | && fndecl != current_function_decl | |
593 | && DECL_SAVED_INSNS (fndecl)) | |
594 | is_integrable = 1; | |
595 | else if (! TREE_ADDRESSABLE (fndecl)) | |
596 | { | |
13d39dbc | 597 | /* In case this function later becomes inlinable, |
51bbfa0c RS |
598 | record that there was already a non-inline call to it. |
599 | ||
600 | Use abstraction instead of setting TREE_ADDRESSABLE | |
601 | directly. */ | |
0481a55e RK |
602 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline) |
603 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
51bbfa0c RS |
604 | mark_addressable (fndecl); |
605 | } | |
606 | ||
d45cf215 RS |
607 | if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl) |
608 | && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode) | |
51bbfa0c | 609 | is_const = 1; |
5e24110e RS |
610 | |
611 | if (TREE_THIS_VOLATILE (fndecl)) | |
612 | is_volatile = 1; | |
51bbfa0c RS |
613 | } |
614 | } | |
615 | ||
fdff8c6d RK |
616 | /* If we don't have specific function to call, see if we have a |
617 | constant or `noreturn' function from the type. */ | |
618 | if (fndecl == 0) | |
619 | { | |
620 | is_const = TREE_READONLY (TREE_TYPE (TREE_TYPE (p))); | |
621 | is_volatile = TREE_THIS_VOLATILE (TREE_TYPE (TREE_TYPE (p))); | |
622 | } | |
623 | ||
6f90e075 JW |
624 | #ifdef REG_PARM_STACK_SPACE |
625 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
626 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
627 | #else | |
628 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
629 | #endif | |
630 | #endif | |
631 | ||
51bbfa0c RS |
632 | /* Warn if this value is an aggregate type, |
633 | regardless of which calling convention we are using for it. */ | |
05e3bdb9 | 634 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
51bbfa0c RS |
635 | warning ("function call has aggregate value"); |
636 | ||
637 | /* Set up a place to return a structure. */ | |
638 | ||
639 | /* Cater to broken compilers. */ | |
640 | if (aggregate_value_p (exp)) | |
641 | { | |
642 | /* This call returns a big structure. */ | |
643 | is_const = 0; | |
644 | ||
645 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
646 | { |
647 | pcc_struct_value = 1; | |
0dd532dc JW |
648 | /* Easier than making that case work right. */ |
649 | if (is_integrable) | |
650 | { | |
651 | /* In case this is a static function, note that it has been | |
652 | used. */ | |
653 | if (! TREE_ADDRESSABLE (fndecl)) | |
654 | mark_addressable (fndecl); | |
655 | is_integrable = 0; | |
656 | } | |
9e7b1d0a RS |
657 | } |
658 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
659 | { | |
660 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 661 | |
9e7b1d0a RS |
662 | if (struct_value_size < 0) |
663 | abort (); | |
51bbfa0c | 664 | |
9e7b1d0a RS |
665 | if (target && GET_CODE (target) == MEM) |
666 | structure_value_addr = XEXP (target, 0); | |
667 | else | |
668 | { | |
669 | /* Assign a temporary on the stack to hold the value. */ | |
51bbfa0c | 670 | |
9e7b1d0a RS |
671 | /* For variable-sized objects, we must be called with a target |
672 | specified. If we were to allocate space on the stack here, | |
673 | we would have no way of knowing when to free it. */ | |
51bbfa0c | 674 | |
9e7b1d0a RS |
675 | structure_value_addr |
676 | = XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0); | |
677 | target = 0; | |
678 | } | |
679 | } | |
680 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
681 | } |
682 | ||
683 | /* If called function is inline, try to integrate it. */ | |
684 | ||
685 | if (is_integrable) | |
686 | { | |
687 | rtx temp; | |
2f4aa534 | 688 | rtx before_call = get_last_insn (); |
51bbfa0c RS |
689 | |
690 | temp = expand_inline_function (fndecl, actparms, target, | |
691 | ignore, TREE_TYPE (exp), | |
692 | structure_value_addr); | |
693 | ||
694 | /* If inlining succeeded, return. */ | |
854e97f0 | 695 | if ((HOST_WIDE_INT) temp != -1) |
51bbfa0c | 696 | { |
d64f5a78 RS |
697 | /* Perform all cleanups needed for the arguments of this call |
698 | (i.e. destructors in C++). It is ok if these destructors | |
699 | clobber RETURN_VALUE_REG, because the only time we care about | |
700 | this is when TARGET is that register. But in C++, we take | |
701 | care to never return that register directly. */ | |
702 | expand_cleanups_to (old_cleanups); | |
703 | ||
704 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2f4aa534 RS |
705 | /* If the outgoing argument list must be preserved, push |
706 | the stack before executing the inlined function if it | |
707 | makes any calls. */ | |
708 | ||
709 | for (i = reg_parm_stack_space - 1; i >= 0; i--) | |
710 | if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) | |
711 | break; | |
712 | ||
713 | if (stack_arg_under_construction || i >= 0) | |
714 | { | |
d64f5a78 | 715 | rtx insn = NEXT_INSN (before_call), seq; |
2f4aa534 | 716 | |
d64f5a78 RS |
717 | /* Look for a call in the inline function code. |
718 | If OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) is | |
719 | nonzero then there is a call and it is not necessary | |
720 | to scan the insns. */ | |
721 | ||
722 | if (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) == 0) | |
723 | for (; insn; insn = NEXT_INSN (insn)) | |
724 | if (GET_CODE (insn) == CALL_INSN) | |
725 | break; | |
2f4aa534 RS |
726 | |
727 | if (insn) | |
728 | { | |
d64f5a78 RS |
729 | /* Reserve enough stack space so that the largest |
730 | argument list of any function call in the inline | |
731 | function does not overlap the argument list being | |
732 | evaluated. This is usually an overestimate because | |
733 | allocate_dynamic_stack_space reserves space for an | |
734 | outgoing argument list in addition to the requested | |
735 | space, but there is no way to ask for stack space such | |
736 | that an argument list of a certain length can be | |
737 | safely constructed. */ | |
738 | ||
739 | int adjust = OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)); | |
740 | #ifdef REG_PARM_STACK_SPACE | |
741 | /* Add the stack space reserved for register arguments | |
742 | in the inline function. What is really needed is the | |
743 | largest value of reg_parm_stack_space in the inline | |
744 | function, but that is not available. Using the current | |
745 | value of reg_parm_stack_space is wrong, but gives | |
746 | correct results on all supported machines. */ | |
747 | adjust += reg_parm_stack_space; | |
748 | #endif | |
2f4aa534 | 749 | start_sequence (); |
ccf5d244 | 750 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
e5d70561 RK |
751 | allocate_dynamic_stack_space (GEN_INT (adjust), |
752 | NULL_RTX, BITS_PER_UNIT); | |
2f4aa534 RS |
753 | seq = get_insns (); |
754 | end_sequence (); | |
755 | emit_insns_before (seq, NEXT_INSN (before_call)); | |
e5d70561 | 756 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
2f4aa534 RS |
757 | } |
758 | } | |
d64f5a78 | 759 | #endif |
51bbfa0c RS |
760 | |
761 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
762 | checks in store_expr. They can be equivalent but not equal in the | |
763 | case of a function that returns BLKmode. */ | |
764 | if (temp != target && rtx_equal_p (temp, target)) | |
765 | return target; | |
766 | return temp; | |
767 | } | |
768 | ||
769 | /* If inlining failed, mark FNDECL as needing to be compiled | |
0481a55e RK |
770 | separately after all. If function was declared inline, |
771 | give a warning. */ | |
772 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
773 | && ! TREE_ADDRESSABLE (fndecl)) | |
774 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
51bbfa0c RS |
775 | mark_addressable (fndecl); |
776 | } | |
777 | ||
778 | /* When calling a const function, we must pop the stack args right away, | |
779 | so that the pop is deleted or moved with the call. */ | |
780 | if (is_const) | |
781 | NO_DEFER_POP; | |
782 | ||
783 | function_call_count++; | |
784 | ||
785 | if (fndecl && DECL_NAME (fndecl)) | |
786 | name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); | |
787 | ||
efd65a8b RS |
788 | /* On some machines (such as the PA) indirect calls have a different |
789 | calling convention than normal calls. FUNCTION_ARG in the target | |
790 | description can look at current_call_is_indirect to determine which | |
791 | calling convention to use. */ | |
792 | current_call_is_indirect = (fndecl == 0); | |
793 | #if 0 | |
794 | = TREE_CODE (TREE_OPERAND (exp, 0)) == NON_LVALUE_EXPR ? 1 : 0; | |
795 | #endif | |
796 | ||
51bbfa0c RS |
797 | #if 0 |
798 | /* Unless it's a call to a specific function that isn't alloca, | |
799 | if it has one argument, we must assume it might be alloca. */ | |
800 | ||
801 | may_be_alloca = | |
802 | (!(fndecl != 0 && strcmp (name, "alloca")) | |
803 | && actparms != 0 | |
804 | && TREE_CHAIN (actparms) == 0); | |
805 | #else | |
806 | /* We assume that alloca will always be called by name. It | |
807 | makes no sense to pass it as a pointer-to-function to | |
808 | anything that does not understand its behavior. */ | |
809 | may_be_alloca = | |
810 | (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 | |
811 | && name[0] == 'a' | |
812 | && ! strcmp (name, "alloca")) | |
813 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
814 | && name[0] == '_' | |
815 | && ! strcmp (name, "__builtin_alloca")))); | |
816 | #endif | |
817 | ||
818 | /* See if this is a call to a function that can return more than once | |
819 | or a call to longjmp. */ | |
820 | ||
821 | returns_twice = 0; | |
822 | is_longjmp = 0; | |
823 | ||
824 | if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15) | |
825 | { | |
826 | char *tname = name; | |
827 | ||
8d515633 | 828 | /* Disregard prefix _, __ or __x. */ |
51bbfa0c | 829 | if (name[0] == '_') |
8d515633 RS |
830 | { |
831 | if (name[1] == '_' && name[2] == 'x') | |
832 | tname += 3; | |
833 | else if (name[1] == '_') | |
834 | tname += 2; | |
835 | else | |
836 | tname += 1; | |
837 | } | |
51bbfa0c RS |
838 | |
839 | if (tname[0] == 's') | |
840 | { | |
841 | returns_twice | |
842 | = ((tname[1] == 'e' | |
843 | && (! strcmp (tname, "setjmp") | |
844 | || ! strcmp (tname, "setjmp_syscall"))) | |
845 | || (tname[1] == 'i' | |
846 | && ! strcmp (tname, "sigsetjmp")) | |
847 | || (tname[1] == 'a' | |
848 | && ! strcmp (tname, "savectx"))); | |
849 | if (tname[1] == 'i' | |
850 | && ! strcmp (tname, "siglongjmp")) | |
851 | is_longjmp = 1; | |
852 | } | |
853 | else if ((tname[0] == 'q' && tname[1] == 's' | |
854 | && ! strcmp (tname, "qsetjmp")) | |
855 | || (tname[0] == 'v' && tname[1] == 'f' | |
856 | && ! strcmp (tname, "vfork"))) | |
857 | returns_twice = 1; | |
858 | ||
859 | else if (tname[0] == 'l' && tname[1] == 'o' | |
860 | && ! strcmp (tname, "longjmp")) | |
861 | is_longjmp = 1; | |
862 | } | |
863 | ||
51bbfa0c RS |
864 | if (may_be_alloca) |
865 | current_function_calls_alloca = 1; | |
866 | ||
867 | /* Don't let pending stack adjusts add up to too much. | |
868 | Also, do all pending adjustments now | |
869 | if there is any chance this might be a call to alloca. */ | |
870 | ||
871 | if (pending_stack_adjust >= 32 | |
872 | || (pending_stack_adjust > 0 && may_be_alloca)) | |
873 | do_pending_stack_adjust (); | |
874 | ||
875 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
876 | funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
877 | if (TREE_CODE (funtype) != POINTER_TYPE) | |
878 | abort (); | |
879 | funtype = TREE_TYPE (funtype); | |
880 | ||
cc79451b RK |
881 | /* Push the temporary stack slot level so that we can free any temporaries |
882 | we make. */ | |
51bbfa0c RS |
883 | push_temp_slots (); |
884 | ||
885 | /* Start updating where the next arg would go. */ | |
85ec8ec4 | 886 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX); |
51bbfa0c RS |
887 | |
888 | /* If struct_value_rtx is 0, it means pass the address | |
889 | as if it were an extra parameter. */ | |
890 | if (structure_value_addr && struct_value_rtx == 0) | |
891 | { | |
d64f5a78 | 892 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
893 | /* If the stack will be adjusted, make sure the structure address |
894 | does not refer to virtual_outgoing_args_rtx. */ | |
895 | rtx temp = (stack_arg_under_construction | |
896 | ? copy_addr_to_reg (structure_value_addr) | |
897 | : force_reg (Pmode, structure_value_addr)); | |
d64f5a78 RS |
898 | #else |
899 | rtx temp = force_reg (Pmode, structure_value_addr); | |
900 | #endif | |
901 | ||
51bbfa0c RS |
902 | actparms |
903 | = tree_cons (error_mark_node, | |
904 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2f4aa534 | 905 | temp), |
51bbfa0c RS |
906 | actparms); |
907 | structure_value_addr_parm = 1; | |
908 | } | |
909 | ||
910 | /* Count the arguments and set NUM_ACTUALS. */ | |
911 | for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++; | |
912 | num_actuals = i; | |
913 | ||
914 | /* Compute number of named args. | |
915 | Normally, don't include the last named arg if anonymous args follow. | |
916 | (If no anonymous args follow, the result of list_length | |
917 | is actually one too large.) | |
918 | ||
919 | If SETUP_INCOMING_VARARGS is defined, this machine will be able to | |
920 | place unnamed args that were passed in registers into the stack. So | |
921 | treat all args as named. This allows the insns emitting for a specific | |
d45cf215 | 922 | argument list to be independent of the function declaration. |
51bbfa0c RS |
923 | |
924 | If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable | |
925 | way to pass unnamed args in registers, so we must force them into | |
926 | memory. */ | |
927 | #ifndef SETUP_INCOMING_VARARGS | |
928 | if (TYPE_ARG_TYPES (funtype) != 0) | |
929 | n_named_args | |
930 | = list_length (TYPE_ARG_TYPES (funtype)) - 1 | |
931 | /* Count the struct value address, if it is passed as a parm. */ | |
932 | + structure_value_addr_parm; | |
933 | else | |
934 | #endif | |
935 | /* If we know nothing, treat all args as named. */ | |
936 | n_named_args = num_actuals; | |
937 | ||
938 | /* Make a vector to hold all the information about each arg. */ | |
939 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); | |
940 | bzero (args, num_actuals * sizeof (struct arg_data)); | |
941 | ||
942 | args_size.constant = 0; | |
943 | args_size.var = 0; | |
944 | ||
945 | /* In this loop, we consider args in the order they are written. | |
946 | We fill up ARGS from the front of from the back if necessary | |
947 | so that in any case the first arg to be pushed ends up at the front. */ | |
948 | ||
949 | #ifdef PUSH_ARGS_REVERSED | |
950 | i = num_actuals - 1, inc = -1; | |
951 | /* In this case, must reverse order of args | |
952 | so that we compute and push the last arg first. */ | |
953 | #else | |
954 | i = 0, inc = 1; | |
955 | #endif | |
956 | ||
957 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
958 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
959 | { | |
960 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
321e0bba | 961 | int unsignedp; |
84b55618 | 962 | enum machine_mode mode; |
51bbfa0c RS |
963 | |
964 | args[i].tree_value = TREE_VALUE (p); | |
965 | ||
966 | /* Replace erroneous argument with constant zero. */ | |
967 | if (type == error_mark_node || TYPE_SIZE (type) == 0) | |
968 | args[i].tree_value = integer_zero_node, type = integer_type_node; | |
969 | ||
970 | /* Decide where to pass this arg. | |
971 | ||
972 | args[i].reg is nonzero if all or part is passed in registers. | |
973 | ||
974 | args[i].partial is nonzero if part but not all is passed in registers, | |
975 | and the exact value says how many words are passed in registers. | |
976 | ||
977 | args[i].pass_on_stack is nonzero if the argument must at least be | |
978 | computed on the stack. It may then be loaded back into registers | |
979 | if args[i].reg is nonzero. | |
980 | ||
981 | These decisions are driven by the FUNCTION_... macros and must agree | |
982 | with those made by function.c. */ | |
983 | ||
51bbfa0c | 984 | /* See if this argument should be passed by invisible reference. */ |
7ef1fbd7 RK |
985 | if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
986 | && contains_placeholder_p (TYPE_SIZE (type))) | |
987 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
988 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), | |
989 | type, argpos < n_named_args) | |
990 | #endif | |
991 | ) | |
51bbfa0c | 992 | { |
5e0de251 DE |
993 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
994 | if (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type), type, | |
995 | argpos < n_named_args) | |
996 | /* If it's in a register, we must make a copy of it too. */ | |
997 | /* ??? Is this a sufficient test? Is there a better one? */ | |
998 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
999 | && REG_P (DECL_RTL (args[i].tree_value)))) | |
51bbfa0c | 1000 | { |
5e0de251 DE |
1001 | args[i].tree_value = build1 (ADDR_EXPR, |
1002 | build_pointer_type (type), | |
1003 | args[i].tree_value); | |
1004 | type = build_pointer_type (type); | |
51bbfa0c RS |
1005 | } |
1006 | else | |
5e0de251 | 1007 | #endif |
82c0ff02 | 1008 | { |
5e0de251 DE |
1009 | /* We make a copy of the object and pass the address to the |
1010 | function being called. */ | |
1011 | rtx copy; | |
51bbfa0c | 1012 | |
5e0de251 DE |
1013 | if (TYPE_SIZE (type) == 0 |
1014 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
1015 | { | |
1016 | /* This is a variable-sized object. Make space on the stack | |
1017 | for it. */ | |
1018 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1019 | ||
1020 | if (old_stack_level == 0) | |
1021 | { | |
1022 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
1023 | old_pending_adj = pending_stack_adjust; | |
1024 | pending_stack_adjust = 0; | |
1025 | } | |
1026 | ||
1027 | copy = gen_rtx (MEM, BLKmode, | |
1028 | allocate_dynamic_stack_space (size_rtx, | |
1029 | NULL_RTX, | |
1030 | TYPE_ALIGN (type))); | |
1031 | } | |
1032 | else | |
1033 | { | |
1034 | int size = int_size_in_bytes (type); | |
1035 | copy = assign_stack_temp (TYPE_MODE (type), size, 1); | |
1036 | } | |
51bbfa0c | 1037 | |
05e3bdb9 | 1038 | MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type); |
6e87e69e | 1039 | |
5e0de251 DE |
1040 | store_expr (args[i].tree_value, copy, 0); |
1041 | ||
1042 | args[i].tree_value = build1 (ADDR_EXPR, | |
1043 | build_pointer_type (type), | |
1044 | make_tree (type, copy)); | |
1045 | type = build_pointer_type (type); | |
1046 | } | |
51bbfa0c | 1047 | } |
51bbfa0c | 1048 | |
84b55618 | 1049 | mode = TYPE_MODE (type); |
321e0bba | 1050 | unsignedp = TREE_UNSIGNED (type); |
84b55618 RK |
1051 | |
1052 | #ifdef PROMOTE_FUNCTION_ARGS | |
321e0bba | 1053 | mode = promote_mode (type, mode, &unsignedp, 1); |
84b55618 RK |
1054 | #endif |
1055 | ||
321e0bba | 1056 | args[i].unsignedp = unsignedp; |
1efe6448 | 1057 | args[i].mode = mode; |
84b55618 | 1058 | args[i].reg = FUNCTION_ARG (args_so_far, mode, type, |
51bbfa0c RS |
1059 | argpos < n_named_args); |
1060 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
1061 | if (args[i].reg) | |
1062 | args[i].partial | |
84b55618 | 1063 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type, |
51bbfa0c RS |
1064 | argpos < n_named_args); |
1065 | #endif | |
1066 | ||
84b55618 | 1067 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); |
51bbfa0c RS |
1068 | |
1069 | /* If FUNCTION_ARG returned an (expr_list (nil) FOO), it means that | |
1070 | we are to pass this arg in the register(s) designated by FOO, but | |
1071 | also to pass it in the stack. */ | |
1072 | if (args[i].reg && GET_CODE (args[i].reg) == EXPR_LIST | |
1073 | && XEXP (args[i].reg, 0) == 0) | |
1074 | args[i].pass_on_stack = 1, args[i].reg = XEXP (args[i].reg, 1); | |
1075 | ||
1076 | /* If this is an addressable type, we must preallocate the stack | |
1077 | since we must evaluate the object into its final location. | |
1078 | ||
1079 | If this is to be passed in both registers and the stack, it is simpler | |
1080 | to preallocate. */ | |
1081 | if (TREE_ADDRESSABLE (type) | |
1082 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1083 | must_preallocate = 1; | |
1084 | ||
1085 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1086 | we cannot consider this function call constant. */ | |
1087 | if (TREE_ADDRESSABLE (type)) | |
1088 | is_const = 0; | |
1089 | ||
1090 | /* Compute the stack-size of this argument. */ | |
1091 | if (args[i].reg == 0 || args[i].partial != 0 | |
1092 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 1093 | || reg_parm_stack_space > 0 |
51bbfa0c RS |
1094 | #endif |
1095 | || args[i].pass_on_stack) | |
1efe6448 | 1096 | locate_and_pad_parm (mode, type, |
51bbfa0c RS |
1097 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
1098 | 1, | |
1099 | #else | |
1100 | args[i].reg != 0, | |
1101 | #endif | |
1102 | fndecl, &args_size, &args[i].offset, | |
1103 | &args[i].size); | |
1104 | ||
1105 | #ifndef ARGS_GROW_DOWNWARD | |
1106 | args[i].slot_offset = args_size; | |
1107 | #endif | |
1108 | ||
1109 | #ifndef REG_PARM_STACK_SPACE | |
1110 | /* If a part of the arg was put into registers, | |
1111 | don't include that part in the amount pushed. */ | |
1112 | if (! args[i].pass_on_stack) | |
1113 | args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) | |
1114 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
1115 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
1116 | #endif | |
1117 | ||
1118 | /* Update ARGS_SIZE, the total stack space for args so far. */ | |
1119 | ||
1120 | args_size.constant += args[i].size.constant; | |
1121 | if (args[i].size.var) | |
1122 | { | |
1123 | ADD_PARM_SIZE (args_size, args[i].size.var); | |
1124 | } | |
1125 | ||
1126 | /* Since the slot offset points to the bottom of the slot, | |
1127 | we must record it after incrementing if the args grow down. */ | |
1128 | #ifdef ARGS_GROW_DOWNWARD | |
1129 | args[i].slot_offset = args_size; | |
1130 | ||
1131 | args[i].slot_offset.constant = -args_size.constant; | |
1132 | if (args_size.var) | |
1133 | { | |
1134 | SUB_PARM_SIZE (args[i].slot_offset, args_size.var); | |
1135 | } | |
1136 | #endif | |
1137 | ||
1138 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1139 | have been used, etc. */ | |
1140 | ||
1141 | FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type, | |
1142 | argpos < n_named_args); | |
1143 | } | |
1144 | ||
6f90e075 JW |
1145 | #ifdef FINAL_REG_PARM_STACK_SPACE |
1146 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
1147 | args_size.var); | |
1148 | #endif | |
1149 | ||
51bbfa0c RS |
1150 | /* Compute the actual size of the argument block required. The variable |
1151 | and constant sizes must be combined, the size may have to be rounded, | |
1152 | and there may be a minimum required size. */ | |
1153 | ||
1154 | original_args_size = args_size; | |
1155 | if (args_size.var) | |
1156 | { | |
1157 | /* If this function requires a variable-sized argument list, don't try to | |
1158 | make a cse'able block for this call. We may be able to do this | |
1159 | eventually, but it is too complicated to keep track of what insns go | |
1160 | in the cse'able block and which don't. */ | |
1161 | ||
1162 | is_const = 0; | |
1163 | must_preallocate = 1; | |
1164 | ||
1165 | args_size.var = ARGS_SIZE_TREE (args_size); | |
1166 | args_size.constant = 0; | |
1167 | ||
1168 | #ifdef STACK_BOUNDARY | |
1169 | if (STACK_BOUNDARY != BITS_PER_UNIT) | |
1170 | args_size.var = round_up (args_size.var, STACK_BYTES); | |
1171 | #endif | |
1172 | ||
1173 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 1174 | if (reg_parm_stack_space > 0) |
51bbfa0c RS |
1175 | { |
1176 | args_size.var | |
1177 | = size_binop (MAX_EXPR, args_size.var, | |
1178 | size_int (REG_PARM_STACK_SPACE (fndecl))); | |
1179 | ||
1180 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1181 | /* The area corresponding to register parameters is not to count in | |
1182 | the size of the block we need. So make the adjustment. */ | |
1183 | args_size.var | |
1184 | = size_binop (MINUS_EXPR, args_size.var, | |
6f90e075 | 1185 | size_int (reg_parm_stack_space)); |
51bbfa0c RS |
1186 | #endif |
1187 | } | |
1188 | #endif | |
1189 | } | |
1190 | else | |
1191 | { | |
1192 | #ifdef STACK_BOUNDARY | |
1193 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
1194 | / STACK_BYTES) * STACK_BYTES); | |
1195 | #endif | |
1196 | ||
1197 | #ifdef REG_PARM_STACK_SPACE | |
1198 | args_size.constant = MAX (args_size.constant, | |
6f90e075 | 1199 | reg_parm_stack_space); |
e1336658 JW |
1200 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
1201 | if (reg_parm_stack_space == 0) | |
1202 | args_size.constant = 0; | |
1203 | #endif | |
51bbfa0c | 1204 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
6f90e075 | 1205 | args_size.constant -= reg_parm_stack_space; |
51bbfa0c RS |
1206 | #endif |
1207 | #endif | |
1208 | } | |
1209 | ||
1210 | /* See if we have or want to preallocate stack space. | |
1211 | ||
1212 | If we would have to push a partially-in-regs parm | |
1213 | before other stack parms, preallocate stack space instead. | |
1214 | ||
1215 | If the size of some parm is not a multiple of the required stack | |
1216 | alignment, we must preallocate. | |
1217 | ||
1218 | If the total size of arguments that would otherwise create a copy in | |
1219 | a temporary (such as a CALL) is more than half the total argument list | |
1220 | size, preallocation is faster. | |
1221 | ||
1222 | Another reason to preallocate is if we have a machine (like the m88k) | |
1223 | where stack alignment is required to be maintained between every | |
1224 | pair of insns, not just when the call is made. However, we assume here | |
1225 | that such machines either do not have push insns (and hence preallocation | |
1226 | would occur anyway) or the problem is taken care of with | |
1227 | PUSH_ROUNDING. */ | |
1228 | ||
1229 | if (! must_preallocate) | |
1230 | { | |
1231 | int partial_seen = 0; | |
1232 | int copy_to_evaluate_size = 0; | |
1233 | ||
1234 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1235 | { | |
1236 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1237 | partial_seen = 1; | |
1238 | else if (partial_seen && args[i].reg == 0) | |
1239 | must_preallocate = 1; | |
1240 | ||
1241 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1242 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1243 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1244 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1245 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1246 | copy_to_evaluate_size | |
1247 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1248 | } | |
1249 | ||
c62f36cf RS |
1250 | if (copy_to_evaluate_size * 2 >= args_size.constant |
1251 | && args_size.constant > 0) | |
51bbfa0c RS |
1252 | must_preallocate = 1; |
1253 | } | |
1254 | ||
1255 | /* If the structure value address will reference the stack pointer, we must | |
1256 | stabilize it. We don't need to do this if we know that we are not going | |
1257 | to adjust the stack pointer in processing this call. */ | |
1258 | ||
1259 | if (structure_value_addr | |
1260 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
1261 | || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr)) | |
1262 | && (args_size.var | |
1263 | #ifndef ACCUMULATE_OUTGOING_ARGS | |
1264 | || args_size.constant | |
1265 | #endif | |
1266 | )) | |
1267 | structure_value_addr = copy_to_reg (structure_value_addr); | |
1268 | ||
1269 | /* If this function call is cse'able, precompute all the parameters. | |
1270 | Note that if the parameter is constructed into a temporary, this will | |
1271 | cause an additional copy because the parameter will be constructed | |
1272 | into a temporary location and then copied into the outgoing arguments. | |
1273 | If a parameter contains a call to alloca and this function uses the | |
1274 | stack, precompute the parameter. */ | |
1275 | ||
1ce0cb53 JW |
1276 | /* If we preallocated the stack space, and some arguments must be passed |
1277 | on the stack, then we must precompute any parameter which contains a | |
1278 | function call which will store arguments on the stack. | |
1279 | Otherwise, evaluating the parameter may clobber previous parameters | |
1280 | which have already been stored into the stack. */ | |
1281 | ||
51bbfa0c RS |
1282 | for (i = 0; i < num_actuals; i++) |
1283 | if (is_const | |
1284 | || ((args_size.var != 0 || args_size.constant != 0) | |
1ce0cb53 JW |
1285 | && calls_function (args[i].tree_value, 1)) |
1286 | || (must_preallocate && (args_size.var != 0 || args_size.constant != 0) | |
1287 | && calls_function (args[i].tree_value, 0))) | |
51bbfa0c | 1288 | { |
cc79451b RK |
1289 | push_temp_slots (); |
1290 | ||
51bbfa0c | 1291 | args[i].initial_value = args[i].value |
e5d70561 | 1292 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1efe6448 | 1293 | |
7373d92d RK |
1294 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode) |
1295 | args[i].value | |
1296 | = convert_modes (args[i].mode, | |
1297 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
1298 | args[i].value, args[i].unsignedp); | |
1299 | ||
51bbfa0c | 1300 | preserve_temp_slots (args[i].value); |
cc79451b | 1301 | pop_temp_slots (); |
51bbfa0c RS |
1302 | |
1303 | /* ANSI doesn't require a sequence point here, | |
1304 | but PCC has one, so this will avoid some problems. */ | |
1305 | emit_queue (); | |
1306 | } | |
1307 | ||
1308 | /* Now we are about to start emitting insns that can be deleted | |
1309 | if a libcall is deleted. */ | |
1310 | if (is_const) | |
1311 | start_sequence (); | |
1312 | ||
1313 | /* If we have no actual push instructions, or shouldn't use them, | |
1314 | make space for all args right now. */ | |
1315 | ||
1316 | if (args_size.var != 0) | |
1317 | { | |
1318 | if (old_stack_level == 0) | |
1319 | { | |
e5d70561 | 1320 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
51bbfa0c RS |
1321 | old_pending_adj = pending_stack_adjust; |
1322 | pending_stack_adjust = 0; | |
d64f5a78 | 1323 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
1324 | /* stack_arg_under_construction says whether a stack arg is |
1325 | being constructed at the old stack level. Pushing the stack | |
1326 | gets a clean outgoing argument block. */ | |
1327 | old_stack_arg_under_construction = stack_arg_under_construction; | |
1328 | stack_arg_under_construction = 0; | |
d64f5a78 | 1329 | #endif |
51bbfa0c RS |
1330 | } |
1331 | argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0); | |
1332 | } | |
1333 | else if (must_preallocate) | |
1334 | { | |
1335 | /* Note that we must go through the motions of allocating an argument | |
1336 | block even if the size is zero because we may be storing args | |
1337 | in the area reserved for register arguments, which may be part of | |
1338 | the stack frame. */ | |
1339 | int needed = args_size.constant; | |
1340 | ||
1341 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
1342 | /* Store the maximum argument space used. It will be pushed by the | |
1343 | prologue. | |
1344 | ||
1345 | Since the stack pointer will never be pushed, it is possible for | |
1346 | the evaluation of a parm to clobber something we have already | |
1347 | written to the stack. Since most function calls on RISC machines | |
1348 | do not use the stack, this is uncommon, but must work correctly. | |
1349 | ||
1350 | Therefore, we save any area of the stack that was already written | |
1351 | and that we are using. Here we set up to do this by making a new | |
1352 | stack usage map from the old one. The actual save will be done | |
1353 | by store_one_arg. | |
1354 | ||
1355 | Another approach might be to try to reorder the argument | |
1356 | evaluations to avoid this conflicting stack usage. */ | |
1357 | ||
1358 | if (needed > current_function_outgoing_args_size) | |
1359 | current_function_outgoing_args_size = needed; | |
1360 | ||
1361 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
1362 | /* Since we will be writing into the entire argument area, the | |
1363 | map must be allocated for its entire size, not just the part that | |
1364 | is the responsibility of the caller. */ | |
6f90e075 | 1365 | needed += reg_parm_stack_space; |
51bbfa0c RS |
1366 | #endif |
1367 | ||
1368 | #ifdef ARGS_GROW_DOWNWARD | |
1369 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
1370 | needed + 1); | |
1371 | #else | |
1372 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, needed); | |
1373 | #endif | |
1374 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); | |
1375 | ||
1376 | if (initial_highest_arg_in_use) | |
1377 | bcopy (initial_stack_usage_map, stack_usage_map, | |
1378 | initial_highest_arg_in_use); | |
1379 | ||
1380 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) | |
1381 | bzero (&stack_usage_map[initial_highest_arg_in_use], | |
1382 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); | |
1383 | needed = 0; | |
2f4aa534 | 1384 | |
bfbf933a RS |
1385 | /* The address of the outgoing argument list must not be copied to a |
1386 | register here, because argblock would be left pointing to the | |
1387 | wrong place after the call to allocate_dynamic_stack_space below. */ | |
2f4aa534 | 1388 | |
51bbfa0c | 1389 | argblock = virtual_outgoing_args_rtx; |
2f4aa534 | 1390 | |
51bbfa0c RS |
1391 | #else /* not ACCUMULATE_OUTGOING_ARGS */ |
1392 | if (inhibit_defer_pop == 0) | |
1393 | { | |
1394 | /* Try to reuse some or all of the pending_stack_adjust | |
1395 | to get this space. Maybe we can avoid any pushing. */ | |
1396 | if (needed > pending_stack_adjust) | |
1397 | { | |
1398 | needed -= pending_stack_adjust; | |
1399 | pending_stack_adjust = 0; | |
1400 | } | |
1401 | else | |
1402 | { | |
1403 | pending_stack_adjust -= needed; | |
1404 | needed = 0; | |
1405 | } | |
1406 | } | |
1407 | /* Special case this because overhead of `push_block' in this | |
1408 | case is non-trivial. */ | |
1409 | if (needed == 0) | |
1410 | argblock = virtual_outgoing_args_rtx; | |
1411 | else | |
e5d70561 | 1412 | argblock = push_block (GEN_INT (needed), 0, 0); |
51bbfa0c RS |
1413 | |
1414 | /* We only really need to call `copy_to_reg' in the case where push | |
1415 | insns are going to be used to pass ARGBLOCK to a function | |
1416 | call in ARGS. In that case, the stack pointer changes value | |
1417 | from the allocation point to the call point, and hence | |
1418 | the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well. | |
1419 | But might as well always do it. */ | |
1420 | argblock = copy_to_reg (argblock); | |
1421 | #endif /* not ACCUMULATE_OUTGOING_ARGS */ | |
1422 | } | |
1423 | ||
bfbf933a RS |
1424 | |
1425 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
1426 | /* The save/restore code in store_one_arg handles all cases except one: | |
1427 | a constructor call (including a C function returning a BLKmode struct) | |
1428 | to initialize an argument. */ | |
1429 | if (stack_arg_under_construction) | |
1430 | { | |
1431 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
e5d70561 | 1432 | rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant); |
bfbf933a | 1433 | #else |
e5d70561 | 1434 | rtx push_size = GEN_INT (args_size.constant); |
bfbf933a RS |
1435 | #endif |
1436 | if (old_stack_level == 0) | |
1437 | { | |
e5d70561 | 1438 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
bfbf933a RS |
1439 | old_pending_adj = pending_stack_adjust; |
1440 | pending_stack_adjust = 0; | |
1441 | /* stack_arg_under_construction says whether a stack arg is | |
1442 | being constructed at the old stack level. Pushing the stack | |
1443 | gets a clean outgoing argument block. */ | |
1444 | old_stack_arg_under_construction = stack_arg_under_construction; | |
1445 | stack_arg_under_construction = 0; | |
1446 | /* Make a new map for the new argument list. */ | |
1447 | stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use); | |
1448 | bzero (stack_usage_map, highest_outgoing_arg_in_use); | |
1449 | highest_outgoing_arg_in_use = 0; | |
1450 | } | |
e5d70561 | 1451 | allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT); |
bfbf933a RS |
1452 | } |
1453 | /* If argument evaluation might modify the stack pointer, copy the | |
1454 | address of the argument list to a register. */ | |
1455 | for (i = 0; i < num_actuals; i++) | |
1456 | if (args[i].pass_on_stack) | |
1457 | { | |
1458 | argblock = copy_addr_to_reg (argblock); | |
1459 | break; | |
1460 | } | |
1461 | #endif | |
1462 | ||
1463 | ||
51bbfa0c RS |
1464 | /* If we preallocated stack space, compute the address of each argument. |
1465 | We need not ensure it is a valid memory address here; it will be | |
1466 | validized when it is used. */ | |
1467 | if (argblock) | |
1468 | { | |
1469 | rtx arg_reg = argblock; | |
1470 | int arg_offset = 0; | |
1471 | ||
1472 | if (GET_CODE (argblock) == PLUS) | |
1473 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1474 | ||
1475 | for (i = 0; i < num_actuals; i++) | |
1476 | { | |
1477 | rtx offset = ARGS_SIZE_RTX (args[i].offset); | |
1478 | rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); | |
1479 | rtx addr; | |
1480 | ||
1481 | /* Skip this parm if it will not be passed on the stack. */ | |
1482 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1483 | continue; | |
1484 | ||
1485 | if (GET_CODE (offset) == CONST_INT) | |
1486 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1487 | else | |
1488 | addr = gen_rtx (PLUS, Pmode, arg_reg, offset); | |
1489 | ||
1490 | addr = plus_constant (addr, arg_offset); | |
1efe6448 | 1491 | args[i].stack = gen_rtx (MEM, args[i].mode, addr); |
0c0600d5 | 1492 | MEM_IN_STRUCT_P (args[i].stack) |
05e3bdb9 | 1493 | = AGGREGATE_TYPE_P (TREE_TYPE (args[i].tree_value)); |
51bbfa0c RS |
1494 | |
1495 | if (GET_CODE (slot_offset) == CONST_INT) | |
1496 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1497 | else | |
1498 | addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset); | |
1499 | ||
1500 | addr = plus_constant (addr, arg_offset); | |
1efe6448 | 1501 | args[i].stack_slot = gen_rtx (MEM, args[i].mode, addr); |
51bbfa0c RS |
1502 | } |
1503 | } | |
1504 | ||
1505 | #ifdef PUSH_ARGS_REVERSED | |
1506 | #ifdef STACK_BOUNDARY | |
1507 | /* If we push args individually in reverse order, perform stack alignment | |
1508 | before the first push (the last arg). */ | |
1509 | if (argblock == 0) | |
e5d70561 RK |
1510 | anti_adjust_stack (GEN_INT (args_size.constant |
1511 | - original_args_size.constant)); | |
51bbfa0c RS |
1512 | #endif |
1513 | #endif | |
1514 | ||
1515 | /* Don't try to defer pops if preallocating, not even from the first arg, | |
1516 | since ARGBLOCK probably refers to the SP. */ | |
1517 | if (argblock) | |
1518 | NO_DEFER_POP; | |
1519 | ||
1520 | /* Get the function to call, in the form of RTL. */ | |
1521 | if (fndecl) | |
ef5d30c9 RK |
1522 | { |
1523 | /* If this is the first use of the function, see if we need to | |
1524 | make an external definition for it. */ | |
1525 | if (! TREE_USED (fndecl)) | |
1526 | { | |
1527 | assemble_external (fndecl); | |
1528 | TREE_USED (fndecl) = 1; | |
1529 | } | |
1530 | ||
1531 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1532 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1533 | } | |
51bbfa0c RS |
1534 | else |
1535 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1536 | { | |
cc79451b | 1537 | push_temp_slots (); |
e5d70561 | 1538 | funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
cc79451b | 1539 | pop_temp_slots (); /* FUNEXP can't be BLKmode */ |
51bbfa0c RS |
1540 | emit_queue (); |
1541 | } | |
1542 | ||
1543 | /* Figure out the register where the value, if any, will come back. */ | |
1544 | valreg = 0; | |
1545 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
1546 | && ! structure_value_addr) | |
1547 | { | |
1548 | if (pcc_struct_value) | |
1549 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
1550 | fndecl); | |
1551 | else | |
1552 | valreg = hard_function_value (TREE_TYPE (exp), fndecl); | |
1553 | } | |
1554 | ||
1555 | /* Precompute all register parameters. It isn't safe to compute anything | |
1556 | once we have started filling any specific hard regs. */ | |
1557 | reg_parm_seen = 0; | |
1558 | for (i = 0; i < num_actuals; i++) | |
1559 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
1560 | { | |
1561 | reg_parm_seen = 1; | |
1562 | ||
1563 | if (args[i].value == 0) | |
1564 | { | |
cc79451b | 1565 | push_temp_slots (); |
e5d70561 RK |
1566 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, |
1567 | VOIDmode, 0); | |
51bbfa0c | 1568 | preserve_temp_slots (args[i].value); |
cc79451b | 1569 | pop_temp_slots (); |
51bbfa0c RS |
1570 | |
1571 | /* ANSI doesn't require a sequence point here, | |
1572 | but PCC has one, so this will avoid some problems. */ | |
1573 | emit_queue (); | |
1574 | } | |
84b55618 RK |
1575 | |
1576 | /* If we are to promote the function arg to a wider mode, | |
1577 | do it now. */ | |
84b55618 | 1578 | |
843fec55 RK |
1579 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) |
1580 | args[i].value | |
1581 | = convert_modes (args[i].mode, | |
1582 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
1583 | args[i].value, args[i].unsignedp); | |
ebef2728 RK |
1584 | |
1585 | /* If the value is expensive, and we are inside an appropriately | |
1586 | short loop, put the value into a pseudo and then put the pseudo | |
01368078 RK |
1587 | into the hard reg. |
1588 | ||
1589 | For small register classes, also do this if this call uses | |
1590 | register parameters. This is to avoid reload conflicts while | |
1591 | loading the parameters registers. */ | |
ebef2728 RK |
1592 | |
1593 | if ((! (GET_CODE (args[i].value) == REG | |
1594 | || (GET_CODE (args[i].value) == SUBREG | |
1595 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) | |
1596 | && args[i].mode != BLKmode | |
1597 | && rtx_cost (args[i].value, SET) > 2 | |
01368078 RK |
1598 | #ifdef SMALL_REGISTER_CLASSES |
1599 | && (reg_parm_seen || preserve_subexpressions_p ())) | |
1600 | #else | |
ebef2728 | 1601 | && preserve_subexpressions_p ()) |
01368078 | 1602 | #endif |
ebef2728 | 1603 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); |
51bbfa0c RS |
1604 | } |
1605 | ||
1606 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) | |
1607 | /* The argument list is the property of the called routine and it | |
1608 | may clobber it. If the fixed area has been used for previous | |
1609 | parameters, we must save and restore it. | |
1610 | ||
1611 | Here we compute the boundary of the that needs to be saved, if any. */ | |
1612 | ||
b94301c2 RS |
1613 | #ifdef ARGS_GROW_DOWNWARD |
1614 | for (i = 0; i < reg_parm_stack_space + 1; i++) | |
1615 | #else | |
6f90e075 | 1616 | for (i = 0; i < reg_parm_stack_space; i++) |
b94301c2 | 1617 | #endif |
51bbfa0c RS |
1618 | { |
1619 | if (i >= highest_outgoing_arg_in_use | |
1620 | || stack_usage_map[i] == 0) | |
1621 | continue; | |
1622 | ||
1623 | if (low_to_save == -1) | |
1624 | low_to_save = i; | |
1625 | ||
1626 | high_to_save = i; | |
1627 | } | |
1628 | ||
1629 | if (low_to_save >= 0) | |
1630 | { | |
1631 | int num_to_save = high_to_save - low_to_save + 1; | |
1632 | enum machine_mode save_mode | |
1633 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
1634 | rtx stack_area; | |
1635 | ||
1636 | /* If we don't have the required alignment, must do this in BLKmode. */ | |
1637 | if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
1638 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
1639 | save_mode = BLKmode; | |
1640 | ||
1641 | stack_area = gen_rtx (MEM, save_mode, | |
1642 | memory_address (save_mode, | |
b94301c2 RS |
1643 | |
1644 | #ifdef ARGS_GROW_DOWNWARD | |
1645 | plus_constant (argblock, | |
1646 | - high_to_save) | |
1647 | #else | |
51bbfa0c | 1648 | plus_constant (argblock, |
b94301c2 RS |
1649 | low_to_save) |
1650 | #endif | |
1651 | )); | |
51bbfa0c RS |
1652 | if (save_mode == BLKmode) |
1653 | { | |
1654 | save_area = assign_stack_temp (BLKmode, num_to_save, 1); | |
1655 | emit_block_move (validize_mem (save_area), stack_area, | |
e5d70561 | 1656 | GEN_INT (num_to_save), |
51bbfa0c RS |
1657 | PARM_BOUNDARY / BITS_PER_UNIT); |
1658 | } | |
1659 | else | |
1660 | { | |
1661 | save_area = gen_reg_rtx (save_mode); | |
1662 | emit_move_insn (save_area, stack_area); | |
1663 | } | |
1664 | } | |
1665 | #endif | |
1666 | ||
1667 | ||
1668 | /* Now store (and compute if necessary) all non-register parms. | |
1669 | These come before register parms, since they can require block-moves, | |
1670 | which could clobber the registers used for register parms. | |
1671 | Parms which have partial registers are not stored here, | |
1672 | but we do preallocate space here if they want that. */ | |
1673 | ||
1674 | for (i = 0; i < num_actuals; i++) | |
1675 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
1676 | store_one_arg (&args[i], argblock, may_be_alloca, | |
6f90e075 | 1677 | args_size.var != 0, fndecl, reg_parm_stack_space); |
51bbfa0c | 1678 | |
4ab56118 RK |
1679 | #ifdef STRICT_ALIGNMENT |
1680 | /* If we have a parm that is passed in registers but not in memory | |
1681 | and whose alignment does not permit a direct copy into registers, | |
1682 | make a group of pseudos that correspond to each register that we | |
1683 | will later fill. */ | |
1684 | ||
1685 | for (i = 0; i < num_actuals; i++) | |
1686 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
1687 | && args[i].mode == BLKmode | |
1688 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
1689 | < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
1690 | { | |
1691 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
8498efd0 | 1692 | int big_endian_correction = 0; |
4ab56118 RK |
1693 | |
1694 | args[i].n_aligned_regs | |
1695 | = args[i].partial ? args[i].partial | |
1696 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1697 | ||
1698 | args[i].aligned_regs = (rtx *) alloca (sizeof (rtx) | |
1699 | * args[i].n_aligned_regs); | |
1700 | ||
8498efd0 JW |
1701 | /* Structures smaller than a word are aligned to the least signifcant |
1702 | byte (to the right). On a BYTES_BIG_ENDIAN machine, this means we | |
1703 | must skip the empty high order bytes when calculating the bit | |
1704 | offset. */ | |
1705 | if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) | |
1706 | big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); | |
1707 | ||
4ab56118 RK |
1708 | for (j = 0; j < args[i].n_aligned_regs; j++) |
1709 | { | |
1710 | rtx reg = gen_reg_rtx (word_mode); | |
1711 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1712 | int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); | |
1713 | int bitpos; | |
1714 | ||
1715 | args[i].aligned_regs[j] = reg; | |
1716 | ||
1717 | /* Clobber REG and move each partword into it. Ensure we don't | |
1718 | go past the end of the structure. Note that the loop below | |
1719 | works because we've already verified that padding | |
1720 | and endianness are compatible. */ | |
1721 | ||
1722 | emit_insn (gen_rtx (CLOBBER, VOIDmode, reg)); | |
1723 | ||
1724 | for (bitpos = 0; | |
7a03f4b4 | 1725 | bitpos < BITS_PER_WORD && bytes > 0; |
4ab56118 RK |
1726 | bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT) |
1727 | { | |
8498efd0 | 1728 | int xbitpos = bitpos + big_endian_correction; |
4ab56118 RK |
1729 | |
1730 | store_bit_field (reg, bitsize, xbitpos, word_mode, | |
8498efd0 | 1731 | extract_bit_field (word, bitsize, bitpos, 1, |
4ab56118 RK |
1732 | NULL_RTX, word_mode, |
1733 | word_mode, | |
1734 | bitsize / BITS_PER_UNIT, | |
1735 | BITS_PER_WORD), | |
1736 | bitsize / BITS_PER_UNIT, BITS_PER_WORD); | |
1737 | } | |
1738 | } | |
1739 | } | |
1740 | #endif | |
1741 | ||
51bbfa0c RS |
1742 | /* Now store any partially-in-registers parm. |
1743 | This is the last place a block-move can happen. */ | |
1744 | if (reg_parm_seen) | |
1745 | for (i = 0; i < num_actuals; i++) | |
1746 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
1747 | store_one_arg (&args[i], argblock, may_be_alloca, | |
6f90e075 | 1748 | args_size.var != 0, fndecl, reg_parm_stack_space); |
51bbfa0c RS |
1749 | |
1750 | #ifndef PUSH_ARGS_REVERSED | |
1751 | #ifdef STACK_BOUNDARY | |
1752 | /* If we pushed args in forward order, perform stack alignment | |
1753 | after pushing the last arg. */ | |
1754 | if (argblock == 0) | |
e5d70561 RK |
1755 | anti_adjust_stack (GEN_INT (args_size.constant |
1756 | - original_args_size.constant)); | |
51bbfa0c RS |
1757 | #endif |
1758 | #endif | |
1759 | ||
756e0e12 RS |
1760 | /* If register arguments require space on the stack and stack space |
1761 | was not preallocated, allocate stack space here for arguments | |
1762 | passed in registers. */ | |
6e716e89 | 1763 | #if ! defined(ACCUMULATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE) |
756e0e12 | 1764 | if (must_preallocate == 0 && reg_parm_stack_space > 0) |
e5d70561 | 1765 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
1766 | #endif |
1767 | ||
51bbfa0c RS |
1768 | /* Pass the function the address in which to return a structure value. */ |
1769 | if (structure_value_addr && ! structure_value_addr_parm) | |
1770 | { | |
1771 | emit_move_insn (struct_value_rtx, | |
1772 | force_reg (Pmode, | |
e5d70561 RK |
1773 | force_operand (structure_value_addr, |
1774 | NULL_RTX))); | |
51bbfa0c RS |
1775 | if (GET_CODE (struct_value_rtx) == REG) |
1776 | { | |
1777 | push_to_sequence (use_insns); | |
1778 | emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx)); | |
1779 | use_insns = get_insns (); | |
1780 | end_sequence (); | |
1781 | } | |
1782 | } | |
1783 | ||
01368078 | 1784 | funexp = prepare_call_address (funexp, fndecl, &use_insns, reg_parm_seen); |
8b0f9101 | 1785 | |
51bbfa0c RS |
1786 | /* Now do the register loads required for any wholly-register parms or any |
1787 | parms which are passed both on the stack and in a register. Their | |
1788 | expressions were already evaluated. | |
1789 | ||
1790 | Mark all register-parms as living through the call, putting these USE | |
1791 | insns in a list headed by USE_INSNS. */ | |
1792 | ||
1793 | for (i = 0; i < num_actuals; i++) | |
1794 | { | |
1795 | rtx list = args[i].reg; | |
1796 | int partial = args[i].partial; | |
1797 | ||
1798 | while (list) | |
1799 | { | |
1800 | rtx reg; | |
1801 | int nregs; | |
1802 | ||
1803 | /* Process each register that needs to get this arg. */ | |
1804 | if (GET_CODE (list) == EXPR_LIST) | |
1805 | reg = XEXP (list, 0), list = XEXP (list, 1); | |
1806 | else | |
1807 | reg = list, list = 0; | |
1808 | ||
6b972c4f JW |
1809 | /* Set to non-negative if must move a word at a time, even if just |
1810 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1811 | we just use a normal move insn. This value can be zero if the | |
1812 | argument is a zero size structure with no fields. */ | |
51bbfa0c RS |
1813 | nregs = (partial ? partial |
1814 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
6b972c4f JW |
1815 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) |
1816 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
1817 | : -1)); | |
51bbfa0c RS |
1818 | |
1819 | /* If simple case, just do move. If normal partial, store_one_arg | |
1820 | has already loaded the register for us. In all other cases, | |
1821 | load the register(s) from memory. */ | |
1822 | ||
6b972c4f | 1823 | if (nregs == -1) |
51bbfa0c | 1824 | emit_move_insn (reg, args[i].value); |
4ab56118 RK |
1825 | |
1826 | #ifdef STRICT_ALIGNMENT | |
1827 | /* If we have pre-computed the values to put in the registers in | |
1828 | the case of non-aligned structures, copy them in now. */ | |
1829 | ||
1830 | else if (args[i].n_aligned_regs != 0) | |
1831 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1832 | emit_move_insn (gen_rtx (REG, word_mode, REGNO (reg) + j), | |
1833 | args[i].aligned_regs[j]); | |
1834 | #endif | |
1835 | ||
51bbfa0c | 1836 | else if (args[i].partial == 0 || args[i].pass_on_stack) |
6b972c4f JW |
1837 | move_block_to_reg (REGNO (reg), |
1838 | validize_mem (args[i].value), nregs, | |
1839 | args[i].mode); | |
51bbfa0c RS |
1840 | |
1841 | push_to_sequence (use_insns); | |
6b972c4f | 1842 | if (nregs == -1) |
51bbfa0c RS |
1843 | emit_insn (gen_rtx (USE, VOIDmode, reg)); |
1844 | else | |
1845 | use_regs (REGNO (reg), nregs); | |
1846 | use_insns = get_insns (); | |
1847 | end_sequence (); | |
1848 | ||
1849 | /* PARTIAL referred only to the first register, so clear it for the | |
1850 | next time. */ | |
1851 | partial = 0; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | /* Perform postincrements before actually calling the function. */ | |
1856 | emit_queue (); | |
1857 | ||
1858 | /* All arguments and registers used for the call must be set up by now! */ | |
1859 | ||
51bbfa0c RS |
1860 | /* Generate the actual call instruction. */ |
1861 | emit_call_1 (funexp, funtype, args_size.constant, struct_value_size, | |
1862 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
1863 | valreg, old_inhibit_defer_pop, use_insns, is_const); | |
1864 | ||
1865 | /* If call is cse'able, make appropriate pair of reg-notes around it. | |
1866 | Test valreg so we don't crash; may safely ignore `const' | |
1867 | if return type is void. */ | |
1868 | if (is_const && valreg != 0) | |
1869 | { | |
1870 | rtx note = 0; | |
1871 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
1872 | rtx insns; | |
1873 | ||
1874 | /* Construct an "equal form" for the value which mentions all the | |
1875 | arguments in order as well as the function name. */ | |
1876 | #ifdef PUSH_ARGS_REVERSED | |
1877 | for (i = 0; i < num_actuals; i++) | |
1878 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); | |
1879 | #else | |
1880 | for (i = num_actuals - 1; i >= 0; i--) | |
1881 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); | |
1882 | #endif | |
1883 | note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note); | |
1884 | ||
1885 | insns = get_insns (); | |
1886 | end_sequence (); | |
1887 | ||
1888 | emit_libcall_block (insns, temp, valreg, note); | |
1889 | ||
1890 | valreg = temp; | |
1891 | } | |
1892 | ||
1893 | /* For calls to `setjmp', etc., inform flow.c it should complain | |
1894 | if nonvolatile values are live. */ | |
1895 | ||
1896 | if (returns_twice) | |
1897 | { | |
1898 | emit_note (name, NOTE_INSN_SETJMP); | |
1899 | current_function_calls_setjmp = 1; | |
1900 | } | |
1901 | ||
1902 | if (is_longjmp) | |
1903 | current_function_calls_longjmp = 1; | |
1904 | ||
1905 | /* Notice functions that cannot return. | |
1906 | If optimizing, insns emitted below will be dead. | |
1907 | If not optimizing, they will exist, which is useful | |
1908 | if the user uses the `return' command in the debugger. */ | |
1909 | ||
1910 | if (is_volatile || is_longjmp) | |
1911 | emit_barrier (); | |
1912 | ||
51bbfa0c RS |
1913 | /* If value type not void, return an rtx for the value. */ |
1914 | ||
1915 | /* If there are cleanups to be called, don't use a hard reg as target. */ | |
1916 | if (cleanups_this_call != old_cleanups | |
1917 | && target && REG_P (target) | |
1918 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
1919 | target = 0; | |
1920 | ||
1921 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode | |
1922 | || ignore) | |
1923 | { | |
1924 | target = const0_rtx; | |
1925 | } | |
1926 | else if (structure_value_addr) | |
1927 | { | |
1928 | if (target == 0 || GET_CODE (target) != MEM) | |
29008b51 JW |
1929 | { |
1930 | target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), | |
1931 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
1932 | structure_value_addr)); | |
05e3bdb9 | 1933 | MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
29008b51 | 1934 | } |
51bbfa0c RS |
1935 | } |
1936 | else if (pcc_struct_value) | |
1937 | { | |
1938 | if (target == 0) | |
29008b51 | 1939 | { |
30082223 RS |
1940 | /* We used leave the value in the location that it is |
1941 | returned in, but that causes problems if it is used more | |
1942 | than once in one expression. Rather than trying to track | |
1943 | when a copy is required, we always copy when TARGET is | |
1944 | not specified. This calling sequence is only used on | |
1945 | a few machines and TARGET is usually nonzero. */ | |
1946 | if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
6d8b61b9 RS |
1947 | { |
1948 | target = assign_stack_temp (BLKmode, | |
1949 | int_size_in_bytes (TREE_TYPE (exp)), | |
1950 | 0); | |
1951 | ||
05e3bdb9 | 1952 | MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
3b780899 | 1953 | |
6d8b61b9 RS |
1954 | /* Save this temp slot around the pop below. */ |
1955 | preserve_temp_slots (target); | |
1956 | } | |
30082223 RS |
1957 | else |
1958 | target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); | |
29008b51 | 1959 | } |
30082223 RS |
1960 | |
1961 | if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode) | |
51bbfa0c RS |
1962 | emit_move_insn (target, gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), |
1963 | copy_to_reg (valreg))); | |
1964 | else | |
1965 | emit_block_move (target, gen_rtx (MEM, BLKmode, copy_to_reg (valreg)), | |
1966 | expr_size (exp), | |
1967 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); | |
1968 | } | |
84b55618 RK |
1969 | else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) |
1970 | && GET_MODE (target) == GET_MODE (valreg)) | |
51bbfa0c RS |
1971 | /* TARGET and VALREG cannot be equal at this point because the latter |
1972 | would not have REG_FUNCTION_VALUE_P true, while the former would if | |
1973 | it were referring to the same register. | |
1974 | ||
1975 | If they refer to the same register, this move will be a no-op, except | |
1976 | when function inlining is being done. */ | |
1977 | emit_move_insn (target, valreg); | |
1978 | else | |
1979 | target = copy_to_reg (valreg); | |
1980 | ||
84b55618 | 1981 | #ifdef PROMOTE_FUNCTION_RETURN |
5d2ac65e RK |
1982 | /* If we promoted this return value, make the proper SUBREG. TARGET |
1983 | might be const0_rtx here, so be careful. */ | |
1984 | if (GET_CODE (target) == REG | |
1985 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
84b55618 | 1986 | { |
321e0bba RK |
1987 | tree type = TREE_TYPE (exp); |
1988 | int unsignedp = TREE_UNSIGNED (type); | |
84b55618 | 1989 | |
321e0bba RK |
1990 | /* If we don't promote as expected, something is wrong. */ |
1991 | if (GET_MODE (target) | |
1992 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
5d2ac65e RK |
1993 | abort (); |
1994 | ||
321e0bba | 1995 | target = gen_rtx (SUBREG, TYPE_MODE (type), target, 0); |
84b55618 RK |
1996 | SUBREG_PROMOTED_VAR_P (target) = 1; |
1997 | SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; | |
1998 | } | |
1999 | #endif | |
2000 | ||
51bbfa0c RS |
2001 | /* Perform all cleanups needed for the arguments of this call |
2002 | (i.e. destructors in C++). */ | |
2003 | expand_cleanups_to (old_cleanups); | |
2004 | ||
2f4aa534 RS |
2005 | /* If size of args is variable or this was a constructor call for a stack |
2006 | argument, restore saved stack-pointer value. */ | |
51bbfa0c RS |
2007 | |
2008 | if (old_stack_level) | |
2009 | { | |
e5d70561 | 2010 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
51bbfa0c | 2011 | pending_stack_adjust = old_pending_adj; |
d64f5a78 | 2012 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2f4aa534 RS |
2013 | stack_arg_under_construction = old_stack_arg_under_construction; |
2014 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
2015 | stack_usage_map = initial_stack_usage_map; | |
d64f5a78 | 2016 | #endif |
51bbfa0c | 2017 | } |
51bbfa0c RS |
2018 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2019 | else | |
2020 | { | |
2021 | #ifdef REG_PARM_STACK_SPACE | |
2022 | if (save_area) | |
2023 | { | |
2024 | enum machine_mode save_mode = GET_MODE (save_area); | |
2025 | rtx stack_area | |
2026 | = gen_rtx (MEM, save_mode, | |
2027 | memory_address (save_mode, | |
b94301c2 RS |
2028 | #ifdef ARGS_GROW_DOWNWARD |
2029 | plus_constant (argblock, - high_to_save) | |
2030 | #else | |
2031 | plus_constant (argblock, low_to_save) | |
2032 | #endif | |
2033 | )); | |
51bbfa0c RS |
2034 | |
2035 | if (save_mode != BLKmode) | |
2036 | emit_move_insn (stack_area, save_area); | |
2037 | else | |
2038 | emit_block_move (stack_area, validize_mem (save_area), | |
e5d70561 RK |
2039 | GEN_INT (high_to_save - low_to_save + 1), |
2040 | PARM_BOUNDARY / BITS_PER_UNIT); | |
51bbfa0c RS |
2041 | } |
2042 | #endif | |
2043 | ||
2044 | /* If we saved any argument areas, restore them. */ | |
2045 | for (i = 0; i < num_actuals; i++) | |
2046 | if (args[i].save_area) | |
2047 | { | |
2048 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
2049 | rtx stack_area | |
2050 | = gen_rtx (MEM, save_mode, | |
2051 | memory_address (save_mode, | |
2052 | XEXP (args[i].stack_slot, 0))); | |
2053 | ||
2054 | if (save_mode != BLKmode) | |
2055 | emit_move_insn (stack_area, args[i].save_area); | |
2056 | else | |
2057 | emit_block_move (stack_area, validize_mem (args[i].save_area), | |
e5d70561 | 2058 | GEN_INT (args[i].size.constant), |
51bbfa0c RS |
2059 | PARM_BOUNDARY / BITS_PER_UNIT); |
2060 | } | |
2061 | ||
2062 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
2063 | stack_usage_map = initial_stack_usage_map; | |
2064 | } | |
2065 | #endif | |
2066 | ||
59257ff7 RK |
2067 | /* If this was alloca, record the new stack level for nonlocal gotos. |
2068 | Check for the handler slots since we might not have a save area | |
2069 | for non-local gotos. */ | |
2070 | ||
2071 | if (may_be_alloca && nonlocal_goto_handler_slot != 0) | |
e5d70561 | 2072 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
51bbfa0c RS |
2073 | |
2074 | pop_temp_slots (); | |
2075 | ||
2076 | return target; | |
2077 | } | |
2078 | \f | |
322e3e34 RK |
2079 | /* Output a library call to function FUN (a SYMBOL_REF rtx) |
2080 | (emitting the queue unless NO_QUEUE is nonzero), | |
2081 | for a value of mode OUTMODE, | |
2082 | with NARGS different arguments, passed as alternating rtx values | |
2083 | and machine_modes to convert them to. | |
2084 | The rtx values should have been passed through protect_from_queue already. | |
2085 | ||
2086 | NO_QUEUE will be true if and only if the library call is a `const' call | |
2087 | which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent | |
2088 | to the variable is_const in expand_call. | |
2089 | ||
2090 | NO_QUEUE must be true for const calls, because if it isn't, then | |
2091 | any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes, | |
2092 | and will be lost if the libcall sequence is optimized away. | |
2093 | ||
2094 | NO_QUEUE must be false for non-const calls, because if it isn't, the | |
2095 | call insn will have its CONST_CALL_P bit set, and it will be incorrectly | |
2096 | optimized. For instance, the instruction scheduler may incorrectly | |
2097 | move memory references across the non-const call. */ | |
2098 | ||
2099 | void | |
4f90e4a0 RK |
2100 | emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode, |
2101 | int nargs, ...)) | |
322e3e34 | 2102 | { |
4f90e4a0 RK |
2103 | #ifndef __STDC__ |
2104 | rtx orgfun; | |
2105 | int no_queue; | |
2106 | enum machine_mode outmode; | |
2107 | int nargs; | |
2108 | #endif | |
322e3e34 RK |
2109 | va_list p; |
2110 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2111 | struct args_size args_size; | |
2112 | /* Size of arguments before any adjustments (such as rounding). */ | |
2113 | struct args_size original_args_size; | |
2114 | register int argnum; | |
322e3e34 | 2115 | rtx fun; |
322e3e34 RK |
2116 | int inc; |
2117 | int count; | |
2118 | rtx argblock = 0; | |
2119 | CUMULATIVE_ARGS args_so_far; | |
2120 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; | |
2121 | struct args_size offset; struct args_size size; }; | |
2122 | struct arg *argvec; | |
2123 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
322e3e34 | 2124 | rtx use_insns; |
efd65a8b RS |
2125 | /* library calls are never indirect calls. */ |
2126 | int current_call_is_indirect = 0; | |
322e3e34 | 2127 | |
4f90e4a0 RK |
2128 | VA_START (p, nargs); |
2129 | ||
2130 | #ifndef __STDC__ | |
2131 | orgfun = va_arg (p, rtx); | |
322e3e34 RK |
2132 | no_queue = va_arg (p, int); |
2133 | outmode = va_arg (p, enum machine_mode); | |
2134 | nargs = va_arg (p, int); | |
4f90e4a0 RK |
2135 | #endif |
2136 | ||
2137 | fun = orgfun; | |
322e3e34 RK |
2138 | |
2139 | /* Copy all the libcall-arguments out of the varargs data | |
2140 | and into a vector ARGVEC. | |
2141 | ||
2142 | Compute how to pass each argument. We only support a very small subset | |
2143 | of the full argument passing conventions to limit complexity here since | |
2144 | library functions shouldn't have many args. */ | |
2145 | ||
2146 | argvec = (struct arg *) alloca (nargs * sizeof (struct arg)); | |
2147 | ||
2148 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); | |
2149 | ||
2150 | args_size.constant = 0; | |
2151 | args_size.var = 0; | |
2152 | ||
888aa7a9 RS |
2153 | push_temp_slots (); |
2154 | ||
322e3e34 RK |
2155 | for (count = 0; count < nargs; count++) |
2156 | { | |
2157 | rtx val = va_arg (p, rtx); | |
2158 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
2159 | ||
2160 | /* We cannot convert the arg value to the mode the library wants here; | |
2161 | must do it earlier where we know the signedness of the arg. */ | |
2162 | if (mode == BLKmode | |
2163 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
2164 | abort (); | |
2165 | ||
2166 | /* On some machines, there's no way to pass a float to a library fcn. | |
2167 | Pass it as a double instead. */ | |
2168 | #ifdef LIBGCC_NEEDS_DOUBLE | |
2169 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
7373d92d | 2170 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; |
322e3e34 RK |
2171 | #endif |
2172 | ||
2173 | /* There's no need to call protect_from_queue, because | |
2174 | either emit_move_insn or emit_push_insn will do that. */ | |
2175 | ||
2176 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
2177 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
2178 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
2179 | val = force_operand (val, NULL_RTX); | |
2180 | ||
322e3e34 RK |
2181 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
2182 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
888aa7a9 | 2183 | { |
a44492f0 RK |
2184 | /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can |
2185 | be viewed as just an efficiency improvement. */ | |
888aa7a9 RS |
2186 | rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); |
2187 | emit_move_insn (slot, val); | |
2188 | val = XEXP (slot, 0); | |
a44492f0 | 2189 | mode = Pmode; |
888aa7a9 | 2190 | } |
322e3e34 RK |
2191 | #endif |
2192 | ||
888aa7a9 RS |
2193 | argvec[count].value = val; |
2194 | argvec[count].mode = mode; | |
2195 | ||
322e3e34 RK |
2196 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); |
2197 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) | |
2198 | abort (); | |
2199 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
2200 | argvec[count].partial | |
2201 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
2202 | #else | |
2203 | argvec[count].partial = 0; | |
2204 | #endif | |
2205 | ||
2206 | locate_and_pad_parm (mode, NULL_TREE, | |
2207 | argvec[count].reg && argvec[count].partial == 0, | |
2208 | NULL_TREE, &args_size, &argvec[count].offset, | |
2209 | &argvec[count].size); | |
2210 | ||
2211 | if (argvec[count].size.var) | |
2212 | abort (); | |
2213 | ||
2214 | #ifndef REG_PARM_STACK_SPACE | |
2215 | if (argvec[count].partial) | |
2216 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
2217 | #endif | |
2218 | ||
2219 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
2220 | #ifdef REG_PARM_STACK_SPACE | |
2221 | || 1 | |
2222 | #endif | |
2223 | ) | |
2224 | args_size.constant += argvec[count].size.constant; | |
2225 | ||
2226 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2227 | /* If this arg is actually passed on the stack, it might be | |
2228 | clobbering something we already put there (this library call might | |
2229 | be inside the evaluation of an argument to a function whose call | |
2230 | requires the stack). This will only occur when the library call | |
2231 | has sufficient args to run out of argument registers. Abort in | |
2232 | this case; if this ever occurs, code must be added to save and | |
2233 | restore the arg slot. */ | |
2234 | ||
2235 | if (argvec[count].reg == 0 || argvec[count].partial != 0) | |
2236 | abort (); | |
2237 | #endif | |
2238 | ||
2239 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); | |
2240 | } | |
2241 | va_end (p); | |
2242 | ||
2243 | /* If this machine requires an external definition for library | |
2244 | functions, write one out. */ | |
2245 | assemble_external_libcall (fun); | |
2246 | ||
2247 | original_args_size = args_size; | |
2248 | #ifdef STACK_BOUNDARY | |
2249 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
2250 | / STACK_BYTES) * STACK_BYTES); | |
2251 | #endif | |
2252 | ||
2253 | #ifdef REG_PARM_STACK_SPACE | |
2254 | args_size.constant = MAX (args_size.constant, | |
2255 | REG_PARM_STACK_SPACE (NULL_TREE)); | |
2256 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
2257 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); | |
2258 | #endif | |
2259 | #endif | |
2260 | ||
2261 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2262 | if (args_size.constant > current_function_outgoing_args_size) | |
2263 | current_function_outgoing_args_size = args_size.constant; | |
2264 | args_size.constant = 0; | |
2265 | #endif | |
2266 | ||
2267 | #ifndef PUSH_ROUNDING | |
2268 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
2269 | #endif | |
2270 | ||
2271 | #ifdef PUSH_ARGS_REVERSED | |
2272 | #ifdef STACK_BOUNDARY | |
2273 | /* If we push args individually in reverse order, perform stack alignment | |
2274 | before the first push (the last arg). */ | |
2275 | if (argblock == 0) | |
2276 | anti_adjust_stack (GEN_INT (args_size.constant | |
2277 | - original_args_size.constant)); | |
2278 | #endif | |
2279 | #endif | |
2280 | ||
2281 | #ifdef PUSH_ARGS_REVERSED | |
2282 | inc = -1; | |
2283 | argnum = nargs - 1; | |
2284 | #else | |
2285 | inc = 1; | |
2286 | argnum = 0; | |
2287 | #endif | |
2288 | ||
2289 | /* Push the args that need to be pushed. */ | |
2290 | ||
2291 | for (count = 0; count < nargs; count++, argnum += inc) | |
2292 | { | |
2293 | register enum machine_mode mode = argvec[argnum].mode; | |
2294 | register rtx val = argvec[argnum].value; | |
2295 | rtx reg = argvec[argnum].reg; | |
2296 | int partial = argvec[argnum].partial; | |
2297 | ||
2298 | if (! (reg != 0 && partial == 0)) | |
2299 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, | |
2300 | argblock, GEN_INT (argvec[count].offset.constant)); | |
2301 | NO_DEFER_POP; | |
2302 | } | |
2303 | ||
2304 | #ifndef PUSH_ARGS_REVERSED | |
2305 | #ifdef STACK_BOUNDARY | |
2306 | /* If we pushed args in forward order, perform stack alignment | |
2307 | after pushing the last arg. */ | |
2308 | if (argblock == 0) | |
2309 | anti_adjust_stack (GEN_INT (args_size.constant | |
2310 | - original_args_size.constant)); | |
2311 | #endif | |
2312 | #endif | |
2313 | ||
2314 | #ifdef PUSH_ARGS_REVERSED | |
2315 | argnum = nargs - 1; | |
2316 | #else | |
2317 | argnum = 0; | |
2318 | #endif | |
2319 | ||
01368078 | 2320 | fun = prepare_call_address (fun, NULL_TREE, &use_insns, 0); |
8b0f9101 | 2321 | |
322e3e34 RK |
2322 | /* Now load any reg parms into their regs. */ |
2323 | ||
2324 | for (count = 0; count < nargs; count++, argnum += inc) | |
2325 | { | |
2326 | register enum machine_mode mode = argvec[argnum].mode; | |
2327 | register rtx val = argvec[argnum].value; | |
2328 | rtx reg = argvec[argnum].reg; | |
2329 | int partial = argvec[argnum].partial; | |
2330 | ||
2331 | if (reg != 0 && partial == 0) | |
2332 | emit_move_insn (reg, val); | |
2333 | NO_DEFER_POP; | |
2334 | } | |
2335 | ||
2336 | /* For version 1.37, try deleting this entirely. */ | |
2337 | if (! no_queue) | |
2338 | emit_queue (); | |
2339 | ||
2340 | /* Any regs containing parms remain in use through the call. */ | |
2341 | start_sequence (); | |
2342 | for (count = 0; count < nargs; count++) | |
2343 | if (argvec[count].reg != 0) | |
2344 | emit_insn (gen_rtx (USE, VOIDmode, argvec[count].reg)); | |
2345 | ||
2346 | use_insns = get_insns (); | |
2347 | end_sequence (); | |
2348 | ||
322e3e34 RK |
2349 | /* Don't allow popping to be deferred, since then |
2350 | cse'ing of library calls could delete a call and leave the pop. */ | |
2351 | NO_DEFER_POP; | |
2352 | ||
2353 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which | |
2354 | will set inhibit_defer_pop to that value. */ | |
2355 | ||
2356 | emit_call_1 (fun, get_identifier (XSTR (orgfun, 0)), args_size.constant, 0, | |
2357 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
2358 | outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX, | |
2359 | old_inhibit_defer_pop + 1, use_insns, no_queue); | |
2360 | ||
888aa7a9 RS |
2361 | pop_temp_slots (); |
2362 | ||
322e3e34 RK |
2363 | /* Now restore inhibit_defer_pop to its actual original value. */ |
2364 | OK_DEFER_POP; | |
2365 | } | |
2366 | \f | |
2367 | /* Like emit_library_call except that an extra argument, VALUE, | |
2368 | comes second and says where to store the result. | |
fac0ad80 RS |
2369 | (If VALUE is zero, this function chooses a convenient way |
2370 | to return the value. | |
322e3e34 | 2371 | |
fac0ad80 RS |
2372 | This function returns an rtx for where the value is to be found. |
2373 | If VALUE is nonzero, VALUE is returned. */ | |
2374 | ||
2375 | rtx | |
4f90e4a0 RK |
2376 | emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue, |
2377 | enum machine_mode outmode, int nargs, ...)) | |
322e3e34 | 2378 | { |
4f90e4a0 RK |
2379 | #ifndef __STDC__ |
2380 | rtx orgfun; | |
2381 | rtx value; | |
2382 | int no_queue; | |
2383 | enum machine_mode outmode; | |
2384 | int nargs; | |
2385 | #endif | |
322e3e34 RK |
2386 | va_list p; |
2387 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2388 | struct args_size args_size; | |
2389 | /* Size of arguments before any adjustments (such as rounding). */ | |
2390 | struct args_size original_args_size; | |
2391 | register int argnum; | |
322e3e34 | 2392 | rtx fun; |
322e3e34 RK |
2393 | int inc; |
2394 | int count; | |
2395 | rtx argblock = 0; | |
2396 | CUMULATIVE_ARGS args_so_far; | |
2397 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; | |
2398 | struct args_size offset; struct args_size size; }; | |
2399 | struct arg *argvec; | |
2400 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
322e3e34 | 2401 | rtx use_insns; |
322e3e34 | 2402 | rtx mem_value = 0; |
fac0ad80 | 2403 | int pcc_struct_value = 0; |
4f389214 | 2404 | int struct_value_size = 0; |
efd65a8b RS |
2405 | /* library calls are never indirect calls. */ |
2406 | int current_call_is_indirect = 0; | |
d61bee95 | 2407 | int is_const; |
322e3e34 | 2408 | |
4f90e4a0 RK |
2409 | VA_START (p, nargs); |
2410 | ||
2411 | #ifndef __STDC__ | |
2412 | orgfun = va_arg (p, rtx); | |
322e3e34 RK |
2413 | value = va_arg (p, rtx); |
2414 | no_queue = va_arg (p, int); | |
2415 | outmode = va_arg (p, enum machine_mode); | |
2416 | nargs = va_arg (p, int); | |
4f90e4a0 RK |
2417 | #endif |
2418 | ||
d61bee95 | 2419 | is_const = no_queue; |
4f90e4a0 | 2420 | fun = orgfun; |
322e3e34 RK |
2421 | |
2422 | /* If this kind of value comes back in memory, | |
2423 | decide where in memory it should come back. */ | |
fac0ad80 | 2424 | if (aggregate_value_p (type_for_mode (outmode, 0))) |
322e3e34 | 2425 | { |
fac0ad80 RS |
2426 | #ifdef PCC_STATIC_STRUCT_RETURN |
2427 | rtx pointer_reg | |
2428 | = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)), | |
2429 | 0); | |
2430 | mem_value = gen_rtx (MEM, outmode, pointer_reg); | |
2431 | pcc_struct_value = 1; | |
2432 | if (value == 0) | |
2433 | value = gen_reg_rtx (outmode); | |
2434 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
4f389214 | 2435 | struct_value_size = GET_MODE_SIZE (outmode); |
fac0ad80 | 2436 | if (value != 0 && GET_CODE (value) == MEM) |
322e3e34 RK |
2437 | mem_value = value; |
2438 | else | |
2439 | mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0); | |
fac0ad80 | 2440 | #endif |
779c643a JW |
2441 | |
2442 | /* This call returns a big structure. */ | |
2443 | is_const = 0; | |
322e3e34 RK |
2444 | } |
2445 | ||
2446 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
2447 | ||
2448 | /* Copy all the libcall-arguments out of the varargs data | |
2449 | and into a vector ARGVEC. | |
2450 | ||
2451 | Compute how to pass each argument. We only support a very small subset | |
2452 | of the full argument passing conventions to limit complexity here since | |
2453 | library functions shouldn't have many args. */ | |
2454 | ||
2455 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
2456 | ||
2457 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); | |
2458 | ||
2459 | args_size.constant = 0; | |
2460 | args_size.var = 0; | |
2461 | ||
2462 | count = 0; | |
2463 | ||
888aa7a9 RS |
2464 | push_temp_slots (); |
2465 | ||
322e3e34 RK |
2466 | /* If there's a structure value address to be passed, |
2467 | either pass it in the special place, or pass it as an extra argument. */ | |
fac0ad80 | 2468 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) |
322e3e34 RK |
2469 | { |
2470 | rtx addr = XEXP (mem_value, 0); | |
fac0ad80 | 2471 | nargs++; |
322e3e34 | 2472 | |
fac0ad80 RS |
2473 | /* Make sure it is a reasonable operand for a move or push insn. */ |
2474 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
2475 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
2476 | addr = force_operand (addr, NULL_RTX); | |
322e3e34 | 2477 | |
fac0ad80 | 2478 | argvec[count].value = addr; |
4fc3dcd5 | 2479 | argvec[count].mode = Pmode; |
fac0ad80 | 2480 | argvec[count].partial = 0; |
322e3e34 | 2481 | |
4fc3dcd5 | 2482 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); |
322e3e34 | 2483 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
4fc3dcd5 | 2484 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) |
fac0ad80 | 2485 | abort (); |
322e3e34 RK |
2486 | #endif |
2487 | ||
4fc3dcd5 | 2488 | locate_and_pad_parm (Pmode, NULL_TREE, |
fac0ad80 RS |
2489 | argvec[count].reg && argvec[count].partial == 0, |
2490 | NULL_TREE, &args_size, &argvec[count].offset, | |
2491 | &argvec[count].size); | |
322e3e34 RK |
2492 | |
2493 | ||
fac0ad80 | 2494 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
322e3e34 | 2495 | #ifdef REG_PARM_STACK_SPACE |
fac0ad80 | 2496 | || 1 |
322e3e34 | 2497 | #endif |
fac0ad80 RS |
2498 | ) |
2499 | args_size.constant += argvec[count].size.constant; | |
322e3e34 | 2500 | |
4fc3dcd5 | 2501 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree)0, 1); |
fac0ad80 RS |
2502 | |
2503 | count++; | |
322e3e34 RK |
2504 | } |
2505 | ||
2506 | for (; count < nargs; count++) | |
2507 | { | |
2508 | rtx val = va_arg (p, rtx); | |
2509 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
2510 | ||
2511 | /* We cannot convert the arg value to the mode the library wants here; | |
2512 | must do it earlier where we know the signedness of the arg. */ | |
2513 | if (mode == BLKmode | |
2514 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
2515 | abort (); | |
2516 | ||
2517 | /* On some machines, there's no way to pass a float to a library fcn. | |
2518 | Pass it as a double instead. */ | |
2519 | #ifdef LIBGCC_NEEDS_DOUBLE | |
2520 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
7373d92d | 2521 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; |
322e3e34 RK |
2522 | #endif |
2523 | ||
2524 | /* There's no need to call protect_from_queue, because | |
2525 | either emit_move_insn or emit_push_insn will do that. */ | |
2526 | ||
2527 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
2528 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
2529 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
2530 | val = force_operand (val, NULL_RTX); | |
2531 | ||
322e3e34 RK |
2532 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
2533 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
888aa7a9 | 2534 | { |
a44492f0 RK |
2535 | /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can |
2536 | be viewed as just an efficiency improvement. */ | |
888aa7a9 RS |
2537 | rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); |
2538 | emit_move_insn (slot, val); | |
2539 | val = XEXP (slot, 0); | |
2540 | mode = Pmode; | |
2541 | } | |
322e3e34 RK |
2542 | #endif |
2543 | ||
888aa7a9 RS |
2544 | argvec[count].value = val; |
2545 | argvec[count].mode = mode; | |
2546 | ||
322e3e34 RK |
2547 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); |
2548 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) | |
2549 | abort (); | |
2550 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
2551 | argvec[count].partial | |
2552 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
2553 | #else | |
2554 | argvec[count].partial = 0; | |
2555 | #endif | |
2556 | ||
2557 | locate_and_pad_parm (mode, NULL_TREE, | |
2558 | argvec[count].reg && argvec[count].partial == 0, | |
2559 | NULL_TREE, &args_size, &argvec[count].offset, | |
2560 | &argvec[count].size); | |
2561 | ||
2562 | if (argvec[count].size.var) | |
2563 | abort (); | |
2564 | ||
2565 | #ifndef REG_PARM_STACK_SPACE | |
2566 | if (argvec[count].partial) | |
2567 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
2568 | #endif | |
2569 | ||
2570 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
2571 | #ifdef REG_PARM_STACK_SPACE | |
2572 | || 1 | |
2573 | #endif | |
2574 | ) | |
2575 | args_size.constant += argvec[count].size.constant; | |
2576 | ||
2577 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2578 | /* If this arg is actually passed on the stack, it might be | |
2579 | clobbering something we already put there (this library call might | |
2580 | be inside the evaluation of an argument to a function whose call | |
2581 | requires the stack). This will only occur when the library call | |
2582 | has sufficient args to run out of argument registers. Abort in | |
2583 | this case; if this ever occurs, code must be added to save and | |
2584 | restore the arg slot. */ | |
2585 | ||
2586 | if (argvec[count].reg == 0 || argvec[count].partial != 0) | |
2587 | abort (); | |
2588 | #endif | |
2589 | ||
2590 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); | |
2591 | } | |
2592 | va_end (p); | |
2593 | ||
2594 | /* If this machine requires an external definition for library | |
2595 | functions, write one out. */ | |
2596 | assemble_external_libcall (fun); | |
2597 | ||
2598 | original_args_size = args_size; | |
2599 | #ifdef STACK_BOUNDARY | |
2600 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) | |
2601 | / STACK_BYTES) * STACK_BYTES); | |
2602 | #endif | |
2603 | ||
2604 | #ifdef REG_PARM_STACK_SPACE | |
2605 | args_size.constant = MAX (args_size.constant, | |
2606 | REG_PARM_STACK_SPACE (NULL_TREE)); | |
2607 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
2608 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); | |
2609 | #endif | |
2610 | #endif | |
2611 | ||
2612 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2613 | if (args_size.constant > current_function_outgoing_args_size) | |
2614 | current_function_outgoing_args_size = args_size.constant; | |
2615 | args_size.constant = 0; | |
2616 | #endif | |
2617 | ||
2618 | #ifndef PUSH_ROUNDING | |
2619 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
2620 | #endif | |
2621 | ||
2622 | #ifdef PUSH_ARGS_REVERSED | |
2623 | #ifdef STACK_BOUNDARY | |
2624 | /* If we push args individually in reverse order, perform stack alignment | |
2625 | before the first push (the last arg). */ | |
2626 | if (argblock == 0) | |
2627 | anti_adjust_stack (GEN_INT (args_size.constant | |
2628 | - original_args_size.constant)); | |
2629 | #endif | |
2630 | #endif | |
2631 | ||
2632 | #ifdef PUSH_ARGS_REVERSED | |
2633 | inc = -1; | |
2634 | argnum = nargs - 1; | |
2635 | #else | |
2636 | inc = 1; | |
2637 | argnum = 0; | |
2638 | #endif | |
2639 | ||
2640 | /* Push the args that need to be pushed. */ | |
2641 | ||
2642 | for (count = 0; count < nargs; count++, argnum += inc) | |
2643 | { | |
2644 | register enum machine_mode mode = argvec[argnum].mode; | |
2645 | register rtx val = argvec[argnum].value; | |
2646 | rtx reg = argvec[argnum].reg; | |
2647 | int partial = argvec[argnum].partial; | |
2648 | ||
2649 | if (! (reg != 0 && partial == 0)) | |
2650 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, | |
2651 | argblock, GEN_INT (argvec[count].offset.constant)); | |
2652 | NO_DEFER_POP; | |
2653 | } | |
2654 | ||
2655 | #ifndef PUSH_ARGS_REVERSED | |
2656 | #ifdef STACK_BOUNDARY | |
2657 | /* If we pushed args in forward order, perform stack alignment | |
2658 | after pushing the last arg. */ | |
2659 | if (argblock == 0) | |
2660 | anti_adjust_stack (GEN_INT (args_size.constant | |
2661 | - original_args_size.constant)); | |
2662 | #endif | |
2663 | #endif | |
2664 | ||
2665 | #ifdef PUSH_ARGS_REVERSED | |
2666 | argnum = nargs - 1; | |
2667 | #else | |
2668 | argnum = 0; | |
2669 | #endif | |
2670 | ||
01368078 | 2671 | fun = prepare_call_address (fun, NULL_TREE, &use_insns, 0); |
8b0f9101 | 2672 | |
322e3e34 RK |
2673 | /* Now load any reg parms into their regs. */ |
2674 | ||
322e3e34 RK |
2675 | for (count = 0; count < nargs; count++, argnum += inc) |
2676 | { | |
2677 | register enum machine_mode mode = argvec[argnum].mode; | |
2678 | register rtx val = argvec[argnum].value; | |
2679 | rtx reg = argvec[argnum].reg; | |
2680 | int partial = argvec[argnum].partial; | |
2681 | ||
2682 | if (reg != 0 && partial == 0) | |
2683 | emit_move_insn (reg, val); | |
2684 | NO_DEFER_POP; | |
2685 | } | |
2686 | ||
2687 | #if 0 | |
2688 | /* For version 1.37, try deleting this entirely. */ | |
2689 | if (! no_queue) | |
2690 | emit_queue (); | |
2691 | #endif | |
2692 | ||
2693 | /* Any regs containing parms remain in use through the call. */ | |
2694 | start_sequence (); | |
2695 | for (count = 0; count < nargs; count++) | |
2696 | if (argvec[count].reg != 0) | |
2697 | emit_insn (gen_rtx (USE, VOIDmode, argvec[count].reg)); | |
2698 | ||
2699 | use_insns = get_insns (); | |
2700 | end_sequence (); | |
2701 | ||
fac0ad80 RS |
2702 | /* Pass the function the address in which to return a structure value. */ |
2703 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) | |
2704 | { | |
2705 | emit_move_insn (struct_value_rtx, | |
2706 | force_reg (Pmode, | |
2707 | force_operand (XEXP (mem_value, 0), | |
2708 | NULL_RTX))); | |
2709 | if (GET_CODE (struct_value_rtx) == REG) | |
2710 | { | |
2711 | push_to_sequence (use_insns); | |
2712 | emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx)); | |
2713 | use_insns = get_insns (); | |
2714 | end_sequence (); | |
2715 | } | |
2716 | } | |
2717 | ||
322e3e34 RK |
2718 | /* Don't allow popping to be deferred, since then |
2719 | cse'ing of library calls could delete a call and leave the pop. */ | |
2720 | NO_DEFER_POP; | |
2721 | ||
2722 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which | |
2723 | will set inhibit_defer_pop to that value. */ | |
2724 | ||
4f389214 RS |
2725 | emit_call_1 (fun, get_identifier (XSTR (orgfun, 0)), args_size.constant, |
2726 | struct_value_size, | |
322e3e34 | 2727 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), |
fac0ad80 RS |
2728 | (outmode != VOIDmode && mem_value == 0 |
2729 | ? hard_libcall_value (outmode) : NULL_RTX), | |
d61bee95 | 2730 | old_inhibit_defer_pop + 1, use_insns, is_const); |
322e3e34 RK |
2731 | |
2732 | /* Now restore inhibit_defer_pop to its actual original value. */ | |
2733 | OK_DEFER_POP; | |
2734 | ||
888aa7a9 RS |
2735 | pop_temp_slots (); |
2736 | ||
322e3e34 RK |
2737 | /* Copy the value to the right place. */ |
2738 | if (outmode != VOIDmode) | |
2739 | { | |
2740 | if (mem_value) | |
2741 | { | |
2742 | if (value == 0) | |
fac0ad80 | 2743 | value = mem_value; |
322e3e34 RK |
2744 | if (value != mem_value) |
2745 | emit_move_insn (value, mem_value); | |
2746 | } | |
2747 | else if (value != 0) | |
2748 | emit_move_insn (value, hard_libcall_value (outmode)); | |
fac0ad80 RS |
2749 | else |
2750 | value = hard_libcall_value (outmode); | |
322e3e34 | 2751 | } |
fac0ad80 RS |
2752 | |
2753 | return value; | |
322e3e34 RK |
2754 | } |
2755 | \f | |
51bbfa0c RS |
2756 | #if 0 |
2757 | /* Return an rtx which represents a suitable home on the stack | |
2758 | given TYPE, the type of the argument looking for a home. | |
2759 | This is called only for BLKmode arguments. | |
2760 | ||
2761 | SIZE is the size needed for this target. | |
2762 | ARGS_ADDR is the address of the bottom of the argument block for this call. | |
2763 | OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless | |
2764 | if this machine uses push insns. */ | |
2765 | ||
2766 | static rtx | |
2767 | target_for_arg (type, size, args_addr, offset) | |
2768 | tree type; | |
2769 | rtx size; | |
2770 | rtx args_addr; | |
2771 | struct args_size offset; | |
2772 | { | |
2773 | rtx target; | |
2774 | rtx offset_rtx = ARGS_SIZE_RTX (offset); | |
2775 | ||
2776 | /* We do not call memory_address if possible, | |
2777 | because we want to address as close to the stack | |
2778 | as possible. For non-variable sized arguments, | |
2779 | this will be stack-pointer relative addressing. */ | |
2780 | if (GET_CODE (offset_rtx) == CONST_INT) | |
2781 | target = plus_constant (args_addr, INTVAL (offset_rtx)); | |
2782 | else | |
2783 | { | |
2784 | /* I have no idea how to guarantee that this | |
2785 | will work in the presence of register parameters. */ | |
2786 | target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx); | |
2787 | target = memory_address (QImode, target); | |
2788 | } | |
2789 | ||
2790 | return gen_rtx (MEM, BLKmode, target); | |
2791 | } | |
2792 | #endif | |
2793 | \f | |
2794 | /* Store a single argument for a function call | |
2795 | into the register or memory area where it must be passed. | |
2796 | *ARG describes the argument value and where to pass it. | |
2797 | ||
2798 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 2799 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
2800 | |
2801 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
2802 | so must be careful about how the stack is used. | |
2803 | ||
2804 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
2805 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
2806 | that we need not worry about saving and restoring the stack. | |
2807 | ||
2808 | FNDECL is the declaration of the function we are calling. */ | |
2809 | ||
2810 | static void | |
6f90e075 JW |
2811 | store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl, |
2812 | reg_parm_stack_space) | |
51bbfa0c RS |
2813 | struct arg_data *arg; |
2814 | rtx argblock; | |
2815 | int may_be_alloca; | |
2816 | int variable_size; | |
2817 | tree fndecl; | |
6f90e075 | 2818 | int reg_parm_stack_space; |
51bbfa0c RS |
2819 | { |
2820 | register tree pval = arg->tree_value; | |
2821 | rtx reg = 0; | |
2822 | int partial = 0; | |
2823 | int used = 0; | |
2824 | int i, lower_bound, upper_bound; | |
2825 | ||
2826 | if (TREE_CODE (pval) == ERROR_MARK) | |
2827 | return; | |
2828 | ||
cc79451b RK |
2829 | /* Push a new temporary level for any temporaries we make for |
2830 | this argument. */ | |
2831 | push_temp_slots (); | |
2832 | ||
51bbfa0c RS |
2833 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2834 | /* If this is being stored into a pre-allocated, fixed-size, stack area, | |
2835 | save any previous data at that location. */ | |
2836 | if (argblock && ! variable_size && arg->stack) | |
2837 | { | |
2838 | #ifdef ARGS_GROW_DOWNWARD | |
2839 | /* stack_slot is negative, but we want to index stack_usage_map */ | |
2840 | /* with positive values. */ | |
2841 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
2842 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
2843 | else | |
2844 | abort (); | |
2845 | ||
2846 | lower_bound = upper_bound - arg->size.constant; | |
2847 | #else | |
2848 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
2849 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
2850 | else | |
2851 | lower_bound = 0; | |
2852 | ||
2853 | upper_bound = lower_bound + arg->size.constant; | |
2854 | #endif | |
2855 | ||
2856 | for (i = lower_bound; i < upper_bound; i++) | |
2857 | if (stack_usage_map[i] | |
2858 | #ifdef REG_PARM_STACK_SPACE | |
2859 | /* Don't store things in the fixed argument area at this point; | |
2860 | it has already been saved. */ | |
6f90e075 | 2861 | && i > reg_parm_stack_space |
51bbfa0c RS |
2862 | #endif |
2863 | ) | |
2864 | break; | |
2865 | ||
2866 | if (i != upper_bound) | |
2867 | { | |
2868 | /* We need to make a save area. See what mode we can make it. */ | |
2869 | enum machine_mode save_mode | |
2870 | = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); | |
2871 | rtx stack_area | |
2872 | = gen_rtx (MEM, save_mode, | |
2873 | memory_address (save_mode, XEXP (arg->stack_slot, 0))); | |
2874 | ||
2875 | if (save_mode == BLKmode) | |
2876 | { | |
2877 | arg->save_area = assign_stack_temp (BLKmode, | |
2878 | arg->size.constant, 1); | |
cc79451b | 2879 | preserve_temp_slots (arg->save_area); |
51bbfa0c | 2880 | emit_block_move (validize_mem (arg->save_area), stack_area, |
e5d70561 | 2881 | GEN_INT (arg->size.constant), |
51bbfa0c RS |
2882 | PARM_BOUNDARY / BITS_PER_UNIT); |
2883 | } | |
2884 | else | |
2885 | { | |
2886 | arg->save_area = gen_reg_rtx (save_mode); | |
2887 | emit_move_insn (arg->save_area, stack_area); | |
2888 | } | |
2889 | } | |
2890 | } | |
2891 | #endif | |
2892 | ||
2893 | /* If this isn't going to be placed on both the stack and in registers, | |
2894 | set up the register and number of words. */ | |
2895 | if (! arg->pass_on_stack) | |
2896 | reg = arg->reg, partial = arg->partial; | |
2897 | ||
2898 | if (reg != 0 && partial == 0) | |
2899 | /* Being passed entirely in a register. We shouldn't be called in | |
2900 | this case. */ | |
2901 | abort (); | |
2902 | ||
4ab56118 RK |
2903 | #ifdef STRICT_ALIGNMENT |
2904 | /* If this arg needs special alignment, don't load the registers | |
2905 | here. */ | |
2906 | if (arg->n_aligned_regs != 0) | |
2907 | reg = 0; | |
2908 | #endif | |
2909 | ||
51bbfa0c RS |
2910 | /* If this is being partially passed in a register, but multiple locations |
2911 | are specified, we assume that the one partially used is the one that is | |
2912 | listed first. */ | |
2913 | if (reg && GET_CODE (reg) == EXPR_LIST) | |
2914 | reg = XEXP (reg, 0); | |
2915 | ||
4ab56118 | 2916 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
2917 | it directly into its stack slot. Otherwise, we can. */ |
2918 | if (arg->value == 0) | |
d64f5a78 RS |
2919 | { |
2920 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
2921 | /* stack_arg_under_construction is nonzero if a function argument is | |
2922 | being evaluated directly into the outgoing argument list and | |
2923 | expand_call must take special action to preserve the argument list | |
2924 | if it is called recursively. | |
2925 | ||
2926 | For scalar function arguments stack_usage_map is sufficient to | |
2927 | determine which stack slots must be saved and restored. Scalar | |
2928 | arguments in general have pass_on_stack == 0. | |
2929 | ||
2930 | If this argument is initialized by a function which takes the | |
2931 | address of the argument (a C++ constructor or a C function | |
2932 | returning a BLKmode structure), then stack_usage_map is | |
2933 | insufficient and expand_call must push the stack around the | |
2934 | function call. Such arguments have pass_on_stack == 1. | |
2935 | ||
2936 | Note that it is always safe to set stack_arg_under_construction, | |
2937 | but this generates suboptimal code if set when not needed. */ | |
2938 | ||
2939 | if (arg->pass_on_stack) | |
2940 | stack_arg_under_construction++; | |
2941 | #endif | |
3a08477a RK |
2942 | arg->value = expand_expr (pval, |
2943 | (partial | |
2944 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
2945 | ? NULL_RTX : arg->stack, | |
e5d70561 | 2946 | VOIDmode, 0); |
1efe6448 RK |
2947 | |
2948 | /* If we are promoting object (or for any other reason) the mode | |
2949 | doesn't agree, convert the mode. */ | |
2950 | ||
7373d92d RK |
2951 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
2952 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
2953 | arg->value, arg->unsignedp); | |
1efe6448 | 2954 | |
d64f5a78 RS |
2955 | #ifdef ACCUMULATE_OUTGOING_ARGS |
2956 | if (arg->pass_on_stack) | |
2957 | stack_arg_under_construction--; | |
2958 | #endif | |
2959 | } | |
51bbfa0c RS |
2960 | |
2961 | /* Don't allow anything left on stack from computation | |
2962 | of argument to alloca. */ | |
2963 | if (may_be_alloca) | |
2964 | do_pending_stack_adjust (); | |
2965 | ||
2966 | if (arg->value == arg->stack) | |
2967 | /* If the value is already in the stack slot, we are done. */ | |
2968 | ; | |
1efe6448 | 2969 | else if (arg->mode != BLKmode) |
51bbfa0c RS |
2970 | { |
2971 | register int size; | |
2972 | ||
2973 | /* Argument is a scalar, not entirely passed in registers. | |
2974 | (If part is passed in registers, arg->partial says how much | |
2975 | and emit_push_insn will take care of putting it there.) | |
2976 | ||
2977 | Push it, and if its size is less than the | |
2978 | amount of space allocated to it, | |
2979 | also bump stack pointer by the additional space. | |
2980 | Note that in C the default argument promotions | |
2981 | will prevent such mismatches. */ | |
2982 | ||
1efe6448 | 2983 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
2984 | /* Compute how much space the push instruction will push. |
2985 | On many machines, pushing a byte will advance the stack | |
2986 | pointer by a halfword. */ | |
2987 | #ifdef PUSH_ROUNDING | |
2988 | size = PUSH_ROUNDING (size); | |
2989 | #endif | |
2990 | used = size; | |
2991 | ||
2992 | /* Compute how much space the argument should get: | |
2993 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 2994 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
2995 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
2996 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
2997 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
2998 | ||
2999 | /* This isn't already where we want it on the stack, so put it there. | |
3000 | This can either be done with push or copy insns. */ | |
ccf5d244 RK |
3001 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
3002 | 0, partial, reg, used - size, | |
3003 | argblock, ARGS_SIZE_RTX (arg->offset)); | |
51bbfa0c RS |
3004 | } |
3005 | else | |
3006 | { | |
3007 | /* BLKmode, at least partly to be pushed. */ | |
3008 | ||
3009 | register int excess; | |
3010 | rtx size_rtx; | |
3011 | ||
3012 | /* Pushing a nonscalar. | |
3013 | If part is passed in registers, PARTIAL says how much | |
3014 | and emit_push_insn will take care of putting it there. */ | |
3015 | ||
3016 | /* Round its size up to a multiple | |
3017 | of the allocation unit for arguments. */ | |
3018 | ||
3019 | if (arg->size.var != 0) | |
3020 | { | |
3021 | excess = 0; | |
3022 | size_rtx = ARGS_SIZE_RTX (arg->size); | |
3023 | } | |
3024 | else | |
3025 | { | |
51bbfa0c RS |
3026 | /* PUSH_ROUNDING has no effect on us, because |
3027 | emit_push_insn for BLKmode is careful to avoid it. */ | |
0cf91217 | 3028 | excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) |
51bbfa0c | 3029 | + partial * UNITS_PER_WORD); |
e4f93898 | 3030 | size_rtx = expr_size (pval); |
51bbfa0c RS |
3031 | } |
3032 | ||
1efe6448 | 3033 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
51bbfa0c RS |
3034 | TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial, |
3035 | reg, excess, argblock, ARGS_SIZE_RTX (arg->offset)); | |
3036 | } | |
3037 | ||
3038 | ||
3039 | /* Unless this is a partially-in-register argument, the argument is now | |
3040 | in the stack. | |
3041 | ||
3042 | ??? Note that this can change arg->value from arg->stack to | |
3043 | arg->stack_slot and it matters when they are not the same. | |
3044 | It isn't totally clear that this is correct in all cases. */ | |
3045 | if (partial == 0) | |
3046 | arg->value = arg->stack_slot; | |
3047 | ||
3048 | /* Once we have pushed something, pops can't safely | |
3049 | be deferred during the rest of the arguments. */ | |
3050 | NO_DEFER_POP; | |
3051 | ||
3052 | /* ANSI doesn't require a sequence point here, | |
3053 | but PCC has one, so this will avoid some problems. */ | |
3054 | emit_queue (); | |
3055 | ||
3056 | /* Free any temporary slots made in processing this argument. */ | |
3057 | free_temp_slots (); | |
cc79451b | 3058 | pop_temp_slots (); |
51bbfa0c RS |
3059 | |
3060 | #ifdef ACCUMULATE_OUTGOING_ARGS | |
3061 | /* Now mark the segment we just used. */ | |
3062 | if (argblock && ! variable_size && arg->stack) | |
3063 | for (i = lower_bound; i < upper_bound; i++) | |
3064 | stack_usage_map[i] = 1; | |
3065 | #endif | |
3066 | } |