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51bbfa0c | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
3c71940f | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998 |
97fc4caf | 3 | 1999, 2000, 2001 Free Software Foundation, Inc. |
51bbfa0c RS |
4 | |
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
940d9d63 RK |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
51bbfa0c RS |
21 | |
22 | #include "config.h" | |
670ee920 KG |
23 | #include "system.h" |
24 | #include "rtl.h" | |
25 | #include "tree.h" | |
26 | #include "flags.h" | |
27 | #include "expr.h" | |
49ad7cfa | 28 | #include "function.h" |
670ee920 | 29 | #include "regs.h" |
5f6da302 | 30 | #include "toplev.h" |
d6f4ec51 | 31 | #include "output.h" |
b1474bb7 | 32 | #include "tm_p.h" |
ea11ca7e | 33 | #include "timevar.h" |
c67846f2 | 34 | #include "sbitmap.h" |
51bbfa0c | 35 | |
0a1c58a2 JL |
36 | #if !defined FUNCTION_OK_FOR_SIBCALL |
37 | #define FUNCTION_OK_FOR_SIBCALL(DECL) 1 | |
38 | #endif | |
39 | ||
c795bca9 BS |
40 | #if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY |
41 | #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY | |
42 | #endif | |
43 | ||
51bbfa0c | 44 | /* Decide whether a function's arguments should be processed |
bbc8a071 RK |
45 | from first to last or from last to first. |
46 | ||
47 | They should if the stack and args grow in opposite directions, but | |
48 | only if we have push insns. */ | |
51bbfa0c | 49 | |
51bbfa0c | 50 | #ifdef PUSH_ROUNDING |
bbc8a071 | 51 | |
40083ddf | 52 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
f73ad30e | 53 | #define PUSH_ARGS_REVERSED PUSH_ARGS |
51bbfa0c | 54 | #endif |
bbc8a071 | 55 | |
51bbfa0c RS |
56 | #endif |
57 | ||
f73ad30e JH |
58 | #ifndef PUSH_ARGS_REVERSED |
59 | #define PUSH_ARGS_REVERSED 0 | |
60 | #endif | |
61 | ||
c39ada04 DD |
62 | #ifndef STACK_POINTER_OFFSET |
63 | #define STACK_POINTER_OFFSET 0 | |
64 | #endif | |
65 | ||
c795bca9 BS |
66 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
67 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
68 | |
69 | /* Data structure and subroutines used within expand_call. */ | |
70 | ||
71 | struct arg_data | |
72 | { | |
73 | /* Tree node for this argument. */ | |
74 | tree tree_value; | |
1efe6448 RK |
75 | /* Mode for value; TYPE_MODE unless promoted. */ |
76 | enum machine_mode mode; | |
51bbfa0c RS |
77 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
78 | rtx value; | |
79 | /* Initially-compute RTL value for argument; only for const functions. */ | |
80 | rtx initial_value; | |
81 | /* Register to pass this argument in, 0 if passed on stack, or an | |
cacbd532 | 82 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
83 | registers. */ |
84 | rtx reg; | |
099e9712 JH |
85 | /* Register to pass this argument in when generating tail call sequence. |
86 | This is not the same register as for normal calls on machines with | |
87 | register windows. */ | |
88 | rtx tail_call_reg; | |
84b55618 RK |
89 | /* If REG was promoted from the actual mode of the argument expression, |
90 | indicates whether the promotion is sign- or zero-extended. */ | |
91 | int unsignedp; | |
51bbfa0c RS |
92 | /* Number of registers to use. 0 means put the whole arg in registers. |
93 | Also 0 if not passed in registers. */ | |
94 | int partial; | |
d64f5a78 RS |
95 | /* Non-zero if argument must be passed on stack. |
96 | Note that some arguments may be passed on the stack | |
97 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
98 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c RS |
99 | int pass_on_stack; |
100 | /* Offset of this argument from beginning of stack-args. */ | |
101 | struct args_size offset; | |
102 | /* Similar, but offset to the start of the stack slot. Different from | |
103 | OFFSET if this arg pads downward. */ | |
104 | struct args_size slot_offset; | |
105 | /* Size of this argument on the stack, rounded up for any padding it gets, | |
106 | parts of the argument passed in registers do not count. | |
107 | If REG_PARM_STACK_SPACE is defined, then register parms | |
108 | are counted here as well. */ | |
109 | struct args_size size; | |
110 | /* Location on the stack at which parameter should be stored. The store | |
111 | has already been done if STACK == VALUE. */ | |
112 | rtx stack; | |
113 | /* Location on the stack of the start of this argument slot. This can | |
114 | differ from STACK if this arg pads downward. This location is known | |
115 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
116 | rtx stack_slot; | |
51bbfa0c RS |
117 | /* Place that this stack area has been saved, if needed. */ |
118 | rtx save_area; | |
4ab56118 RK |
119 | /* If an argument's alignment does not permit direct copying into registers, |
120 | copy in smaller-sized pieces into pseudos. These are stored in a | |
121 | block pointed to by this field. The next field says how many | |
122 | word-sized pseudos we made. */ | |
123 | rtx *aligned_regs; | |
124 | int n_aligned_regs; | |
4fc026cd CM |
125 | /* The amount that the stack pointer needs to be adjusted to |
126 | force alignment for the next argument. */ | |
127 | struct args_size alignment_pad; | |
51bbfa0c RS |
128 | }; |
129 | ||
b94301c2 | 130 | /* A vector of one char per byte of stack space. A byte if non-zero if |
51bbfa0c RS |
131 | the corresponding stack location has been used. |
132 | This vector is used to prevent a function call within an argument from | |
133 | clobbering any stack already set up. */ | |
134 | static char *stack_usage_map; | |
135 | ||
136 | /* Size of STACK_USAGE_MAP. */ | |
137 | static int highest_outgoing_arg_in_use; | |
2f4aa534 | 138 | |
c67846f2 JJ |
139 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
140 | stack location's tail call argument has been already stored into the stack. | |
141 | This bitmap is used to prevent sibling call optimization if function tries | |
142 | to use parent's incoming argument slots when they have been already | |
143 | overwritten with tail call arguments. */ | |
144 | static sbitmap stored_args_map; | |
145 | ||
2f4aa534 RS |
146 | /* stack_arg_under_construction is nonzero when an argument may be |
147 | initialized with a constructor call (including a C function that | |
148 | returns a BLKmode struct) and expand_call must take special action | |
149 | to make sure the object being constructed does not overlap the | |
150 | argument list for the constructor call. */ | |
151 | int stack_arg_under_construction; | |
51bbfa0c | 152 | |
3d994c6b KG |
153 | static int calls_function PARAMS ((tree, int)); |
154 | static int calls_function_1 PARAMS ((tree, int)); | |
0a1c58a2 | 155 | |
f725a3ec | 156 | /* Nonzero if this is a call to a `const' function. */ |
f2d33f13 JH |
157 | #define ECF_CONST 1 |
158 | /* Nonzero if this is a call to a `volatile' function. */ | |
159 | #define ECF_NORETURN 2 | |
f725a3ec | 160 | /* Nonzero if this is a call to malloc or a related function. */ |
f2d33f13 JH |
161 | #define ECF_MALLOC 4 |
162 | /* Nonzero if it is plausible that this is a call to alloca. */ | |
163 | #define ECF_MAY_BE_ALLOCA 8 | |
164 | /* Nonzero if this is a call to a function that won't throw an exception. */ | |
165 | #define ECF_NOTHROW 16 | |
166 | /* Nonzero if this is a call to setjmp or a related function. */ | |
167 | #define ECF_RETURNS_TWICE 32 | |
168 | /* Nonzero if this is a call to `longjmp'. */ | |
169 | #define ECF_LONGJMP 64 | |
170 | /* Nonzero if this is a syscall that makes a new process in the image of | |
171 | the current one. */ | |
172 | #define ECF_FORK_OR_EXEC 128 | |
173 | #define ECF_SIBCALL 256 | |
2a8f6b90 JH |
174 | /* Nonzero if this is a call to "pure" function (like const function, |
175 | but may read memory. */ | |
176 | #define ECF_PURE 512 | |
7393c642 RK |
177 | /* Nonzero if this is a call to a function that returns with the stack |
178 | pointer depressed. */ | |
179 | #define ECF_SP_DEPRESSED 1024 | |
9d98f8f9 JH |
180 | /* Nonzero if this call is known to always return. */ |
181 | #define ECF_ALWAYS_RETURN 2048 | |
f2d33f13 | 182 | |
3d994c6b KG |
183 | static void emit_call_1 PARAMS ((rtx, tree, tree, HOST_WIDE_INT, |
184 | HOST_WIDE_INT, HOST_WIDE_INT, rtx, | |
0a1c58a2 | 185 | rtx, int, rtx, int)); |
3d994c6b KG |
186 | static void precompute_register_parameters PARAMS ((int, |
187 | struct arg_data *, | |
188 | int *)); | |
4c6b3b2a | 189 | static int store_one_arg PARAMS ((struct arg_data *, rtx, int, int, |
3d994c6b KG |
190 | int)); |
191 | static void store_unaligned_arguments_into_pseudos PARAMS ((struct arg_data *, | |
192 | int)); | |
193 | static int finalize_must_preallocate PARAMS ((int, int, | |
194 | struct arg_data *, | |
195 | struct args_size *)); | |
40d6e956 JH |
196 | static void precompute_arguments PARAMS ((int, int, |
197 | struct arg_data *)); | |
f725a3ec | 198 | static int compute_argument_block_size PARAMS ((int, |
c2f8b491 JH |
199 | struct args_size *, |
200 | int)); | |
3d994c6b KG |
201 | static void initialize_argument_information PARAMS ((int, |
202 | struct arg_data *, | |
203 | struct args_size *, | |
204 | int, tree, tree, | |
205 | CUMULATIVE_ARGS *, | |
206 | int, rtx *, int *, | |
f2d33f13 | 207 | int *, int *)); |
3d994c6b KG |
208 | static void compute_argument_addresses PARAMS ((struct arg_data *, |
209 | rtx, int)); | |
210 | static rtx rtx_for_function_call PARAMS ((tree, tree)); | |
211 | static void load_register_parameters PARAMS ((struct arg_data *, | |
099e9712 | 212 | int, rtx *, int)); |
ebb1b59a BS |
213 | static rtx emit_library_call_value_1 PARAMS ((int, rtx, rtx, |
214 | enum libcall_type, | |
de76b467 JH |
215 | enum machine_mode, |
216 | int, va_list)); | |
f2d33f13 JH |
217 | static int special_function_p PARAMS ((tree, int)); |
218 | static int flags_from_decl_or_type PARAMS ((tree)); | |
219 | static rtx try_to_integrate PARAMS ((tree, tree, rtx, | |
220 | int, tree, rtx)); | |
c67846f2 JJ |
221 | static int check_sibcall_argument_overlap_1 PARAMS ((rtx)); |
222 | static int check_sibcall_argument_overlap PARAMS ((rtx, struct arg_data *)); | |
223 | ||
ce48579b | 224 | static int combine_pending_stack_adjustment_and_call |
739fb049 | 225 | PARAMS ((int, struct args_size *, int)); |
21a3b983 | 226 | |
f73ad30e | 227 | #ifdef REG_PARM_STACK_SPACE |
3d994c6b KG |
228 | static rtx save_fixed_argument_area PARAMS ((int, rtx, int *, int *)); |
229 | static void restore_fixed_argument_area PARAMS ((rtx, rtx, int, int)); | |
20efdf74 | 230 | #endif |
51bbfa0c | 231 | \f |
1ce0cb53 JW |
232 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
233 | `alloca'. | |
234 | ||
235 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
236 | Actually, we only need return 1 if evaluating EXP would require pushing | |
237 | arguments on the stack, but that is too difficult to compute, so we just | |
238 | assume any function call might require the stack. */ | |
51bbfa0c | 239 | |
1c8d7aef RS |
240 | static tree calls_function_save_exprs; |
241 | ||
51bbfa0c | 242 | static int |
1ce0cb53 | 243 | calls_function (exp, which) |
51bbfa0c | 244 | tree exp; |
1ce0cb53 | 245 | int which; |
1c8d7aef RS |
246 | { |
247 | int val; | |
8d5e6e25 | 248 | |
1c8d7aef RS |
249 | calls_function_save_exprs = 0; |
250 | val = calls_function_1 (exp, which); | |
251 | calls_function_save_exprs = 0; | |
252 | return val; | |
253 | } | |
254 | ||
8d5e6e25 RK |
255 | /* Recursive function to do the work of above function. */ |
256 | ||
1c8d7aef RS |
257 | static int |
258 | calls_function_1 (exp, which) | |
259 | tree exp; | |
260 | int which; | |
51bbfa0c RS |
261 | { |
262 | register int i; | |
0207efa2 | 263 | enum tree_code code = TREE_CODE (exp); |
8d5e6e25 RK |
264 | int class = TREE_CODE_CLASS (code); |
265 | int length = first_rtl_op (code); | |
51bbfa0c | 266 | |
ddd5a7c1 | 267 | /* If this code is language-specific, we don't know what it will do. */ |
0207efa2 RK |
268 | if ((int) code >= NUM_TREE_CODES) |
269 | return 1; | |
51bbfa0c | 270 | |
0207efa2 | 271 | switch (code) |
51bbfa0c RS |
272 | { |
273 | case CALL_EXPR: | |
1ce0cb53 JW |
274 | if (which == 0) |
275 | return 1; | |
43db0363 RK |
276 | else if ((TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
277 | == FUNCTION_TYPE) | |
278 | && (TYPE_RETURNS_STACK_DEPRESSED | |
279 | (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))))) | |
7393c642 | 280 | return 1; |
1ce0cb53 JW |
281 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR |
282 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
8d5e6e25 RK |
283 | == FUNCTION_DECL) |
284 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
285 | 0) | |
286 | & ECF_MAY_BE_ALLOCA)) | |
287 | return 1; | |
51bbfa0c | 288 | |
51bbfa0c RS |
289 | break; |
290 | ||
b367c416 RK |
291 | case CONSTRUCTOR: |
292 | { | |
293 | tree tem; | |
294 | ||
295 | for (tem = CONSTRUCTOR_ELTS (exp); tem != 0; tem = TREE_CHAIN (tem)) | |
296 | if (calls_function_1 (TREE_VALUE (tem), which)) | |
297 | return 1; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | ||
51bbfa0c RS |
302 | case SAVE_EXPR: |
303 | if (SAVE_EXPR_RTL (exp) != 0) | |
304 | return 0; | |
1c8d7aef RS |
305 | if (value_member (exp, calls_function_save_exprs)) |
306 | return 0; | |
307 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, | |
308 | calls_function_save_exprs); | |
309 | return (TREE_OPERAND (exp, 0) != 0 | |
310 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); | |
51bbfa0c RS |
311 | |
312 | case BLOCK: | |
ef03bc85 CH |
313 | { |
314 | register tree local; | |
8d5e6e25 | 315 | register tree subblock; |
ef03bc85 CH |
316 | |
317 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1ce0cb53 | 318 | if (DECL_INITIAL (local) != 0 |
1c8d7aef | 319 | && calls_function_1 (DECL_INITIAL (local), which)) |
ef03bc85 | 320 | return 1; |
ef03bc85 CH |
321 | |
322 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
323 | subblock; | |
324 | subblock = TREE_CHAIN (subblock)) | |
1c8d7aef | 325 | if (calls_function_1 (subblock, which)) |
ef03bc85 CH |
326 | return 1; |
327 | } | |
328 | return 0; | |
8d5e6e25 | 329 | |
0c4c16df JH |
330 | case TREE_LIST: |
331 | for (; exp != 0; exp = TREE_CHAIN (exp)) | |
332 | if (calls_function_1 (TREE_VALUE (exp), which)) | |
333 | return 1; | |
334 | return 0; | |
51bbfa0c | 335 | |
e9a25f70 JL |
336 | default: |
337 | break; | |
51bbfa0c RS |
338 | } |
339 | ||
8d5e6e25 RK |
340 | /* Only expressions, references, and blocks can contain calls. */ |
341 | if (! IS_EXPR_CODE_CLASS (class) && class != 'r' && class != 'b') | |
0c4c16df JH |
342 | return 0; |
343 | ||
51bbfa0c RS |
344 | for (i = 0; i < length; i++) |
345 | if (TREE_OPERAND (exp, i) != 0 | |
1c8d7aef | 346 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
51bbfa0c RS |
347 | return 1; |
348 | ||
349 | return 0; | |
350 | } | |
351 | \f | |
352 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
353 | and return that as an rtx. Also load the static chain register | |
354 | if FNDECL is a nested function. | |
355 | ||
77cac2f2 RK |
356 | CALL_FUSAGE points to a variable holding the prospective |
357 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 358 | |
03dacb02 | 359 | rtx |
3affaf29 | 360 | prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen, sibcallp) |
51bbfa0c RS |
361 | rtx funexp; |
362 | tree fndecl; | |
77cac2f2 | 363 | rtx *call_fusage; |
01368078 | 364 | int reg_parm_seen; |
3affaf29 | 365 | int sibcallp; |
51bbfa0c RS |
366 | { |
367 | rtx static_chain_value = 0; | |
368 | ||
369 | funexp = protect_from_queue (funexp, 0); | |
370 | ||
371 | if (fndecl != 0) | |
0f41302f | 372 | /* Get possible static chain value for nested function in C. */ |
51bbfa0c RS |
373 | static_chain_value = lookup_static_chain (fndecl); |
374 | ||
375 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
376 | but not for a constant address if -fno-function-cse. */ | |
377 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 378 | /* If we are using registers for parameters, force the |
e9a25f70 JL |
379 | function address into a register now. */ |
380 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
381 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
382 | : memory_address (FUNCTION_MODE, funexp)); | |
3affaf29 | 383 | else if (! sibcallp) |
51bbfa0c RS |
384 | { |
385 | #ifndef NO_FUNCTION_CSE | |
386 | if (optimize && ! flag_no_function_cse) | |
387 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
388 | if (fndecl != current_function_decl) | |
389 | #endif | |
390 | funexp = force_reg (Pmode, funexp); | |
391 | #endif | |
392 | } | |
393 | ||
394 | if (static_chain_value != 0) | |
395 | { | |
396 | emit_move_insn (static_chain_rtx, static_chain_value); | |
397 | ||
f991a240 RK |
398 | if (GET_CODE (static_chain_rtx) == REG) |
399 | use_reg (call_fusage, static_chain_rtx); | |
51bbfa0c RS |
400 | } |
401 | ||
402 | return funexp; | |
403 | } | |
404 | ||
405 | /* Generate instructions to call function FUNEXP, | |
406 | and optionally pop the results. | |
407 | The CALL_INSN is the first insn generated. | |
408 | ||
607ea900 | 409 | FNDECL is the declaration node of the function. This is given to the |
2c8da025 RK |
410 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
411 | ||
334c4f0f RK |
412 | FUNTYPE is the data type of the function. This is given to the macro |
413 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
414 | We used to allow an identifier for library functions, but that doesn't | |
415 | work when the return type is an aggregate type and the calling convention | |
416 | says that the pointer to this aggregate is to be popped by the callee. | |
51bbfa0c RS |
417 | |
418 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
419 | ROUNDED_STACK_SIZE is that number rounded up to |
420 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
421 | both to put into the call insn and to generate explicit popping | |
422 | code if necessary. | |
51bbfa0c RS |
423 | |
424 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
425 | It is zero if this call doesn't want a structure value. | |
426 | ||
427 | NEXT_ARG_REG is the rtx that results from executing | |
428 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
429 | just after all the args have had their registers assigned. | |
430 | This could be whatever you like, but normally it is the first | |
431 | arg-register beyond those used for args in this call, | |
432 | or 0 if all the arg-registers are used in this call. | |
433 | It is passed on to `gen_call' so you can put this info in the call insn. | |
434 | ||
435 | VALREG is a hard register in which a value is returned, | |
436 | or 0 if the call does not return a value. | |
437 | ||
438 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
439 | the args to this call were processed. | |
440 | We restore `inhibit_defer_pop' to that value. | |
441 | ||
94b25f81 | 442 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
7393c642 | 443 | denote registers used by the called function. */ |
f725a3ec | 444 | |
322e3e34 | 445 | static void |
fb5eebb9 RH |
446 | emit_call_1 (funexp, fndecl, funtype, stack_size, rounded_stack_size, |
447 | struct_value_size, next_arg_reg, valreg, old_inhibit_defer_pop, | |
0a1c58a2 | 448 | call_fusage, ecf_flags) |
51bbfa0c | 449 | rtx funexp; |
c84e2712 KG |
450 | tree fndecl ATTRIBUTE_UNUSED; |
451 | tree funtype ATTRIBUTE_UNUSED; | |
6a651371 | 452 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED; |
fb5eebb9 | 453 | HOST_WIDE_INT rounded_stack_size; |
962f1324 | 454 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED; |
51bbfa0c RS |
455 | rtx next_arg_reg; |
456 | rtx valreg; | |
457 | int old_inhibit_defer_pop; | |
77cac2f2 | 458 | rtx call_fusage; |
0a1c58a2 | 459 | int ecf_flags; |
51bbfa0c | 460 | { |
062e7fd8 | 461 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
51bbfa0c RS |
462 | rtx call_insn; |
463 | int already_popped = 0; | |
fb5eebb9 | 464 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
f45c9d95 ZW |
465 | #if defined (HAVE_call) && defined (HAVE_call_value) |
466 | rtx struct_value_size_rtx; | |
467 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
468 | #endif | |
51bbfa0c RS |
469 | |
470 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
471 | and we don't want to load it into a register as an optimization, | |
472 | because prepare_call_address already did it if it should be done. */ | |
473 | if (GET_CODE (funexp) != SYMBOL_REF) | |
474 | funexp = memory_address (FUNCTION_MODE, funexp); | |
475 | ||
0a1c58a2 JL |
476 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
477 | if ((ecf_flags & ECF_SIBCALL) | |
478 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
f132f529 | 479 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 480 | { |
f132f529 | 481 | rtx n_pop = GEN_INT (n_popped)); |
0a1c58a2 JL |
482 | rtx pat; |
483 | ||
484 | /* If this subroutine pops its own args, record that in the call insn | |
485 | if possible, for the sake of frame pointer elimination. */ | |
486 | ||
487 | if (valreg) | |
f45c9d95 | 488 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
0a1c58a2 JL |
489 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
490 | rounded_stack_size_rtx, next_arg_reg, | |
491 | n_pop); | |
492 | else | |
f45c9d95 | 493 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
494 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
495 | ||
496 | emit_call_insn (pat); | |
497 | already_popped = 1; | |
498 | } | |
499 | else | |
500 | #endif | |
501 | ||
51bbfa0c | 502 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8bcafee3 JDA |
503 | /* If the target has "call" or "call_value" insns, then prefer them |
504 | if no arguments are actually popped. If the target does not have | |
505 | "call" or "call_value" insns, then we must use the popping versions | |
506 | even if the call has no arguments to pop. */ | |
507 | #if defined (HAVE_call) && defined (HAVE_call_value) | |
508 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
7393c642 | 509 | && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
8bcafee3 JDA |
510 | #else |
511 | if (HAVE_call_pop && HAVE_call_value_pop) | |
512 | #endif | |
51bbfa0c | 513 | { |
fb5eebb9 | 514 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
515 | rtx pat; |
516 | ||
517 | /* If this subroutine pops its own args, record that in the call insn | |
518 | if possible, for the sake of frame pointer elimination. */ | |
2c8da025 | 519 | |
51bbfa0c | 520 | if (valreg) |
f45c9d95 | 521 | pat = GEN_CALL_VALUE_POP (valreg, |
38a448ca | 522 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 523 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c | 524 | else |
f45c9d95 | 525 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 526 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c RS |
527 | |
528 | emit_call_insn (pat); | |
529 | already_popped = 1; | |
530 | } | |
531 | else | |
532 | #endif | |
51bbfa0c | 533 | |
0a1c58a2 JL |
534 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
535 | if ((ecf_flags & ECF_SIBCALL) | |
536 | && HAVE_sibcall && HAVE_sibcall_value) | |
537 | { | |
538 | if (valreg) | |
f45c9d95 | 539 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
0a1c58a2 JL |
540 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
541 | rounded_stack_size_rtx, | |
542 | next_arg_reg, NULL_RTX)); | |
543 | else | |
f45c9d95 | 544 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
545 | rounded_stack_size_rtx, next_arg_reg, |
546 | struct_value_size_rtx)); | |
547 | } | |
548 | else | |
549 | #endif | |
550 | ||
51bbfa0c RS |
551 | #if defined (HAVE_call) && defined (HAVE_call_value) |
552 | if (HAVE_call && HAVE_call_value) | |
553 | { | |
554 | if (valreg) | |
f45c9d95 | 555 | emit_call_insn (GEN_CALL_VALUE (valreg, |
38a448ca | 556 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 557 | rounded_stack_size_rtx, next_arg_reg, |
e992302c | 558 | NULL_RTX)); |
51bbfa0c | 559 | else |
f45c9d95 | 560 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 561 | rounded_stack_size_rtx, next_arg_reg, |
51bbfa0c RS |
562 | struct_value_size_rtx)); |
563 | } | |
564 | else | |
565 | #endif | |
566 | abort (); | |
567 | ||
77cac2f2 | 568 | /* Find the CALL insn we just emitted. */ |
51bbfa0c RS |
569 | for (call_insn = get_last_insn (); |
570 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
571 | call_insn = PREV_INSN (call_insn)) | |
572 | ; | |
573 | ||
574 | if (! call_insn) | |
575 | abort (); | |
576 | ||
2a8f6b90 JH |
577 | /* Mark memory as used for "pure" function call. */ |
578 | if (ecf_flags & ECF_PURE) | |
579 | { | |
580 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
581 | gen_rtx_USE (VOIDmode, | |
582 | gen_rtx_MEM (BLKmode, | |
583 | gen_rtx_SCRATCH (VOIDmode))), call_fusage); | |
584 | } | |
585 | ||
e59e60a7 RK |
586 | /* Put the register usage information on the CALL. If there is already |
587 | some usage information, put ours at the end. */ | |
588 | if (CALL_INSN_FUNCTION_USAGE (call_insn)) | |
589 | { | |
590 | rtx link; | |
591 | ||
592 | for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0; | |
593 | link = XEXP (link, 1)) | |
594 | ; | |
595 | ||
596 | XEXP (link, 1) = call_fusage; | |
597 | } | |
598 | else | |
599 | CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage; | |
51bbfa0c RS |
600 | |
601 | /* If this is a const call, then set the insn's unchanging bit. */ | |
2a8f6b90 | 602 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
24a28584 | 603 | CONST_OR_PURE_CALL_P (call_insn) = 1; |
51bbfa0c | 604 | |
12a22e76 JM |
605 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
606 | effect. */ | |
0a1c58a2 | 607 | if (ecf_flags & ECF_NOTHROW) |
54cea123 | 608 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
12a22e76 JM |
609 | REG_NOTES (call_insn)); |
610 | ||
ca3920ad JW |
611 | if (ecf_flags & ECF_NORETURN) |
612 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx, | |
613 | REG_NOTES (call_insn)); | |
9d98f8f9 JH |
614 | if (ecf_flags & ECF_ALWAYS_RETURN) |
615 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_ALWAYS_RETURN, const0_rtx, | |
616 | REG_NOTES (call_insn)); | |
ca3920ad | 617 | |
570a98eb JH |
618 | if (ecf_flags & ECF_RETURNS_TWICE) |
619 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_SETJMP, const0_rtx, | |
620 | REG_NOTES (call_insn)); | |
621 | ||
0a1c58a2 JL |
622 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
623 | ||
b1e64e0d RS |
624 | /* Restore this now, so that we do defer pops for this call's args |
625 | if the context of the call as a whole permits. */ | |
626 | inhibit_defer_pop = old_inhibit_defer_pop; | |
627 | ||
fb5eebb9 | 628 | if (n_popped > 0) |
51bbfa0c RS |
629 | { |
630 | if (!already_popped) | |
e3da301d | 631 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
632 | = gen_rtx_EXPR_LIST (VOIDmode, |
633 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
634 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 635 | rounded_stack_size -= n_popped; |
062e7fd8 | 636 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 637 | stack_pointer_delta -= n_popped; |
51bbfa0c RS |
638 | } |
639 | ||
f73ad30e | 640 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 641 | { |
f73ad30e JH |
642 | /* If returning from the subroutine does not automatically pop the args, |
643 | we need an instruction to pop them sooner or later. | |
644 | Perhaps do it now; perhaps just record how much space to pop later. | |
645 | ||
646 | If returning from the subroutine does pop the args, indicate that the | |
647 | stack pointer will be changed. */ | |
648 | ||
7393c642 | 649 | if (rounded_stack_size != 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
f73ad30e JH |
650 | { |
651 | if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 652 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
653 | pending_stack_adjust += rounded_stack_size; |
654 | else | |
655 | adjust_stack (rounded_stack_size_rtx); | |
656 | } | |
51bbfa0c | 657 | } |
f73ad30e JH |
658 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
659 | Restore the stack pointer to its original value now. Usually | |
660 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
661 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
662 | popping variants of functions exist as well. | |
663 | ||
664 | ??? We may optimize similar to defer_pop above, but it is | |
665 | probably not worthwhile. | |
f725a3ec | 666 | |
f73ad30e JH |
667 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
668 | such machines. */ | |
669 | else if (n_popped) | |
670 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
671 | } |
672 | ||
20efdf74 JL |
673 | /* Determine if the function identified by NAME and FNDECL is one with |
674 | special properties we wish to know about. | |
675 | ||
676 | For example, if the function might return more than one time (setjmp), then | |
677 | set RETURNS_TWICE to a nonzero value. | |
678 | ||
f2d33f13 | 679 | Similarly set LONGJMP for if the function is in the longjmp family. |
20efdf74 | 680 | |
f2d33f13 | 681 | Set MALLOC for any of the standard memory allocation functions which |
20efdf74 JL |
682 | allocate from the heap. |
683 | ||
684 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate | |
685 | space from the stack such as alloca. */ | |
686 | ||
f2d33f13 JH |
687 | static int |
688 | special_function_p (fndecl, flags) | |
20efdf74 | 689 | tree fndecl; |
f2d33f13 | 690 | int flags; |
20efdf74 | 691 | { |
f2d33f13 | 692 | if (! (flags & ECF_MALLOC) |
3a8c995b | 693 | && fndecl && DECL_NAME (fndecl) |
140592a0 | 694 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
695 | /* Exclude functions not at the file scope, or not `extern', |
696 | since they are not the magic functions we would otherwise | |
697 | think they are. */ | |
698 | && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl)) | |
699 | { | |
63ad61ed ZW |
700 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
701 | const char *tname = name; | |
20efdf74 | 702 | |
ca54603f JL |
703 | /* We assume that alloca will always be called by name. It |
704 | makes no sense to pass it as a pointer-to-function to | |
705 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
706 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
707 | && name[0] == 'a' | |
708 | && ! strcmp (name, "alloca")) | |
709 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
710 | && name[0] == '_' | |
711 | && ! strcmp (name, "__builtin_alloca")))) | |
712 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 713 | |
20efdf74 JL |
714 | /* Disregard prefix _, __ or __x. */ |
715 | if (name[0] == '_') | |
716 | { | |
717 | if (name[1] == '_' && name[2] == 'x') | |
718 | tname += 3; | |
719 | else if (name[1] == '_') | |
720 | tname += 2; | |
721 | else | |
722 | tname += 1; | |
723 | } | |
724 | ||
725 | if (tname[0] == 's') | |
726 | { | |
f2d33f13 JH |
727 | if ((tname[1] == 'e' |
728 | && (! strcmp (tname, "setjmp") | |
729 | || ! strcmp (tname, "setjmp_syscall"))) | |
730 | || (tname[1] == 'i' | |
731 | && ! strcmp (tname, "sigsetjmp")) | |
732 | || (tname[1] == 'a' | |
733 | && ! strcmp (tname, "savectx"))) | |
734 | flags |= ECF_RETURNS_TWICE; | |
735 | ||
20efdf74 JL |
736 | if (tname[1] == 'i' |
737 | && ! strcmp (tname, "siglongjmp")) | |
f2d33f13 | 738 | flags |= ECF_LONGJMP; |
20efdf74 JL |
739 | } |
740 | else if ((tname[0] == 'q' && tname[1] == 's' | |
741 | && ! strcmp (tname, "qsetjmp")) | |
742 | || (tname[0] == 'v' && tname[1] == 'f' | |
743 | && ! strcmp (tname, "vfork"))) | |
f2d33f13 | 744 | flags |= ECF_RETURNS_TWICE; |
20efdf74 JL |
745 | |
746 | else if (tname[0] == 'l' && tname[1] == 'o' | |
747 | && ! strcmp (tname, "longjmp")) | |
f2d33f13 | 748 | flags |= ECF_LONGJMP; |
fa76d9e0 JR |
749 | |
750 | else if ((tname[0] == 'f' && tname[1] == 'o' | |
751 | && ! strcmp (tname, "fork")) | |
752 | /* Linux specific: __clone. check NAME to insist on the | |
753 | leading underscores, to avoid polluting the ISO / POSIX | |
754 | namespace. */ | |
755 | || (name[0] == '_' && name[1] == '_' | |
756 | && ! strcmp (tname, "clone")) | |
757 | || (tname[0] == 'e' && tname[1] == 'x' && tname[2] == 'e' | |
758 | && tname[3] == 'c' && (tname[4] == 'l' || tname[4] == 'v') | |
759 | && (tname[5] == '\0' | |
760 | || ((tname[5] == 'p' || tname[5] == 'e') | |
761 | && tname[6] == '\0')))) | |
f2d33f13 | 762 | flags |= ECF_FORK_OR_EXEC; |
fa76d9e0 | 763 | |
140592a0 | 764 | /* Do not add any more malloc-like functions to this list, |
82514696 KG |
765 | instead mark them as malloc functions using the malloc attribute. |
766 | Note, realloc is not suitable for attribute malloc since | |
1e5a1107 JM |
767 | it may return the same address across multiple calls. |
768 | C++ operator new is not suitable because it is not required | |
769 | to return a unique pointer; indeed, the standard placement new | |
f725a3ec | 770 | just returns its argument. */ |
91d024d5 ML |
771 | else if (TYPE_MODE (TREE_TYPE (TREE_TYPE (fndecl))) == Pmode |
772 | && (! strcmp (tname, "malloc") | |
773 | || ! strcmp (tname, "calloc") | |
774 | || ! strcmp (tname, "strdup"))) | |
f2d33f13 | 775 | flags |= ECF_MALLOC; |
20efdf74 | 776 | } |
f2d33f13 | 777 | return flags; |
20efdf74 JL |
778 | } |
779 | ||
f2d33f13 | 780 | /* Return nonzero when tree represent call to longjmp. */ |
7393c642 | 781 | |
f2d33f13 JH |
782 | int |
783 | setjmp_call_p (fndecl) | |
784 | tree fndecl; | |
785 | { | |
786 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
787 | } | |
788 | ||
789 | /* Detect flags (function attributes) from the function type node. */ | |
7393c642 | 790 | |
f2d33f13 JH |
791 | static int |
792 | flags_from_decl_or_type (exp) | |
793 | tree exp; | |
794 | { | |
795 | int flags = 0; | |
7393c642 | 796 | |
f2d33f13 JH |
797 | /* ??? We can't set IS_MALLOC for function types? */ |
798 | if (DECL_P (exp)) | |
799 | { | |
800 | /* The function exp may have the `malloc' attribute. */ | |
801 | if (DECL_P (exp) && DECL_IS_MALLOC (exp)) | |
802 | flags |= ECF_MALLOC; | |
803 | ||
2a8f6b90 JH |
804 | /* The function exp may have the `pure' attribute. */ |
805 | if (DECL_P (exp) && DECL_IS_PURE (exp)) | |
806 | flags |= ECF_PURE; | |
807 | ||
f2d33f13 JH |
808 | if (TREE_NOTHROW (exp)) |
809 | flags |= ECF_NOTHROW; | |
810 | } | |
811 | ||
7393c642 | 812 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
f2d33f13 JH |
813 | flags |= ECF_CONST; |
814 | ||
815 | if (TREE_THIS_VOLATILE (exp)) | |
816 | flags |= ECF_NORETURN; | |
817 | ||
818 | return flags; | |
819 | } | |
820 | ||
20efdf74 JL |
821 | /* Precompute all register parameters as described by ARGS, storing values |
822 | into fields within the ARGS array. | |
823 | ||
824 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
825 | ||
826 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
827 | ||
828 | static void | |
829 | precompute_register_parameters (num_actuals, args, reg_parm_seen) | |
830 | int num_actuals; | |
831 | struct arg_data *args; | |
832 | int *reg_parm_seen; | |
833 | { | |
834 | int i; | |
835 | ||
836 | *reg_parm_seen = 0; | |
837 | ||
838 | for (i = 0; i < num_actuals; i++) | |
839 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
840 | { | |
841 | *reg_parm_seen = 1; | |
842 | ||
843 | if (args[i].value == 0) | |
844 | { | |
845 | push_temp_slots (); | |
846 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, | |
847 | VOIDmode, 0); | |
848 | preserve_temp_slots (args[i].value); | |
849 | pop_temp_slots (); | |
850 | ||
851 | /* ANSI doesn't require a sequence point here, | |
852 | but PCC has one, so this will avoid some problems. */ | |
853 | emit_queue (); | |
854 | } | |
855 | ||
856 | /* If we are to promote the function arg to a wider mode, | |
857 | do it now. */ | |
858 | ||
859 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
860 | args[i].value | |
861 | = convert_modes (args[i].mode, | |
862 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
863 | args[i].value, args[i].unsignedp); | |
864 | ||
f725a3ec | 865 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
866 | short loop, put the value into a pseudo and then put the pseudo |
867 | into the hard reg. | |
868 | ||
869 | For small register classes, also do this if this call uses | |
870 | register parameters. This is to avoid reload conflicts while | |
871 | loading the parameters registers. */ | |
872 | ||
873 | if ((! (GET_CODE (args[i].value) == REG | |
874 | || (GET_CODE (args[i].value) == SUBREG | |
875 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) | |
876 | && args[i].mode != BLKmode | |
b437f1a7 | 877 | && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1) |
20efdf74 JL |
878 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) |
879 | || preserve_subexpressions_p ())) | |
880 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
881 | } | |
882 | } | |
883 | ||
f73ad30e | 884 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
885 | |
886 | /* The argument list is the property of the called routine and it | |
887 | may clobber it. If the fixed area has been used for previous | |
888 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 889 | |
20efdf74 JL |
890 | static rtx |
891 | save_fixed_argument_area (reg_parm_stack_space, argblock, | |
892 | low_to_save, high_to_save) | |
893 | int reg_parm_stack_space; | |
894 | rtx argblock; | |
895 | int *low_to_save; | |
896 | int *high_to_save; | |
897 | { | |
898 | int i; | |
899 | rtx save_area = NULL_RTX; | |
900 | ||
901 | /* Compute the boundary of the that needs to be saved, if any. */ | |
902 | #ifdef ARGS_GROW_DOWNWARD | |
903 | for (i = 0; i < reg_parm_stack_space + 1; i++) | |
904 | #else | |
905 | for (i = 0; i < reg_parm_stack_space; i++) | |
906 | #endif | |
907 | { | |
908 | if (i >= highest_outgoing_arg_in_use | |
909 | || stack_usage_map[i] == 0) | |
910 | continue; | |
911 | ||
912 | if (*low_to_save == -1) | |
913 | *low_to_save = i; | |
914 | ||
915 | *high_to_save = i; | |
916 | } | |
917 | ||
918 | if (*low_to_save >= 0) | |
919 | { | |
920 | int num_to_save = *high_to_save - *low_to_save + 1; | |
921 | enum machine_mode save_mode | |
922 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
923 | rtx stack_area; | |
924 | ||
925 | /* If we don't have the required alignment, must do this in BLKmode. */ | |
926 | if ((*low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
f725a3ec | 927 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) |
20efdf74 JL |
928 | save_mode = BLKmode; |
929 | ||
930 | #ifdef ARGS_GROW_DOWNWARD | |
3bdf5ad1 RK |
931 | stack_area |
932 | = gen_rtx_MEM (save_mode, | |
933 | memory_address (save_mode, | |
934 | plus_constant (argblock, | |
935 | - *high_to_save))); | |
20efdf74 JL |
936 | #else |
937 | stack_area = gen_rtx_MEM (save_mode, | |
938 | memory_address (save_mode, | |
939 | plus_constant (argblock, | |
940 | *low_to_save))); | |
941 | #endif | |
942 | if (save_mode == BLKmode) | |
943 | { | |
944 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
19caa751 RK |
945 | /* Cannot use emit_block_move here because it can be done by a |
946 | library call which in turn gets into this place again and deadly | |
947 | infinite recursion happens. */ | |
04572513 | 948 | move_by_pieces (validize_mem (save_area), stack_area, num_to_save, |
19caa751 | 949 | PARM_BOUNDARY); |
20efdf74 JL |
950 | } |
951 | else | |
952 | { | |
953 | save_area = gen_reg_rtx (save_mode); | |
954 | emit_move_insn (save_area, stack_area); | |
955 | } | |
956 | } | |
957 | return save_area; | |
958 | } | |
959 | ||
960 | static void | |
961 | restore_fixed_argument_area (save_area, argblock, high_to_save, low_to_save) | |
962 | rtx save_area; | |
963 | rtx argblock; | |
964 | int high_to_save; | |
965 | int low_to_save; | |
966 | { | |
967 | enum machine_mode save_mode = GET_MODE (save_area); | |
968 | #ifdef ARGS_GROW_DOWNWARD | |
969 | rtx stack_area | |
970 | = gen_rtx_MEM (save_mode, | |
971 | memory_address (save_mode, | |
972 | plus_constant (argblock, | |
973 | - high_to_save))); | |
974 | #else | |
975 | rtx stack_area | |
976 | = gen_rtx_MEM (save_mode, | |
977 | memory_address (save_mode, | |
978 | plus_constant (argblock, | |
979 | low_to_save))); | |
980 | #endif | |
981 | ||
982 | if (save_mode != BLKmode) | |
983 | emit_move_insn (stack_area, save_area); | |
984 | else | |
04572513 JJ |
985 | /* Cannot use emit_block_move here because it can be done by a library |
986 | call which in turn gets into this place again and deadly infinite | |
987 | recursion happens. */ | |
988 | move_by_pieces (stack_area, validize_mem (save_area), | |
19caa751 | 989 | high_to_save - low_to_save + 1, PARM_BOUNDARY); |
20efdf74 JL |
990 | } |
991 | #endif | |
f725a3ec | 992 | |
20efdf74 JL |
993 | /* If any elements in ARGS refer to parameters that are to be passed in |
994 | registers, but not in memory, and whose alignment does not permit a | |
995 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 996 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
997 | |
998 | Pseudos for each unaligned argument will be stored into the array | |
999 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
1000 | the aligned_regs array if it is nonzero. */ | |
1001 | ||
20efdf74 JL |
1002 | static void |
1003 | store_unaligned_arguments_into_pseudos (args, num_actuals) | |
1004 | struct arg_data *args; | |
1005 | int num_actuals; | |
1006 | { | |
1007 | int i, j; | |
f725a3ec | 1008 | |
20efdf74 JL |
1009 | for (i = 0; i < num_actuals; i++) |
1010 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
1011 | && args[i].mode == BLKmode | |
1012 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
1013 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
1014 | { | |
1015 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1016 | int big_endian_correction = 0; | |
1017 | ||
1018 | args[i].n_aligned_regs | |
1019 | = args[i].partial ? args[i].partial | |
1020 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1021 | ||
8e6a59fe MM |
1022 | args[i].aligned_regs = (rtx *) xmalloc (sizeof (rtx) |
1023 | * args[i].n_aligned_regs); | |
20efdf74 JL |
1024 | |
1025 | /* Structures smaller than a word are aligned to the least | |
1026 | significant byte (to the right). On a BYTES_BIG_ENDIAN machine, | |
1027 | this means we must skip the empty high order bytes when | |
1028 | calculating the bit offset. */ | |
1029 | if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) | |
1030 | big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); | |
1031 | ||
1032 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1033 | { | |
1034 | rtx reg = gen_reg_rtx (word_mode); | |
1035 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1036 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
1037 | int bitalign = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); | |
1038 | ||
1039 | args[i].aligned_regs[j] = reg; | |
1040 | ||
1041 | /* There is no need to restrict this code to loading items | |
1042 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
1043 | load up entire word sized registers efficiently. | |
1044 | ||
1045 | ??? This may not be needed anymore. | |
1046 | We use to emit a clobber here but that doesn't let later | |
1047 | passes optimize the instructions we emit. By storing 0 into | |
1048 | the register later passes know the first AND to zero out the | |
1049 | bitfield being set in the register is unnecessary. The store | |
1050 | of 0 will be deleted as will at least the first AND. */ | |
1051 | ||
1052 | emit_move_insn (reg, const0_rtx); | |
1053 | ||
1054 | bytes -= bitsize / BITS_PER_UNIT; | |
1055 | store_bit_field (reg, bitsize, big_endian_correction, word_mode, | |
19caa751 RK |
1056 | extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
1057 | word_mode, word_mode, bitalign, | |
20efdf74 | 1058 | BITS_PER_WORD), |
19caa751 | 1059 | bitalign, BITS_PER_WORD); |
20efdf74 JL |
1060 | } |
1061 | } | |
1062 | } | |
1063 | ||
d7cdf113 | 1064 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
f725a3ec | 1065 | ACTPARMS. |
d7cdf113 JL |
1066 | |
1067 | NUM_ACTUALS is the total number of parameters. | |
1068 | ||
1069 | N_NAMED_ARGS is the total number of named arguments. | |
1070 | ||
1071 | FNDECL is the tree code for the target of this call (if known) | |
1072 | ||
1073 | ARGS_SO_FAR holds state needed by the target to know where to place | |
1074 | the next argument. | |
1075 | ||
1076 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
1077 | for arguments which are passed in registers. | |
1078 | ||
1079 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
1080 | and may be modified by this routine. | |
1081 | ||
f2d33f13 | 1082 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
d7cdf113 JL |
1083 | flags which may may be modified by this routine. */ |
1084 | ||
1085 | static void | |
1086 | initialize_argument_information (num_actuals, args, args_size, n_named_args, | |
1087 | actparms, fndecl, args_so_far, | |
1088 | reg_parm_stack_space, old_stack_level, | |
f2d33f13 | 1089 | old_pending_adj, must_preallocate, |
7d167afd | 1090 | ecf_flags) |
91813b28 | 1091 | int num_actuals ATTRIBUTE_UNUSED; |
d7cdf113 JL |
1092 | struct arg_data *args; |
1093 | struct args_size *args_size; | |
91813b28 | 1094 | int n_named_args ATTRIBUTE_UNUSED; |
d7cdf113 JL |
1095 | tree actparms; |
1096 | tree fndecl; | |
959f3a06 | 1097 | CUMULATIVE_ARGS *args_so_far; |
d7cdf113 JL |
1098 | int reg_parm_stack_space; |
1099 | rtx *old_stack_level; | |
1100 | int *old_pending_adj; | |
1101 | int *must_preallocate; | |
f2d33f13 | 1102 | int *ecf_flags; |
d7cdf113 JL |
1103 | { |
1104 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
1105 | int inc; | |
1106 | ||
1107 | /* Count arg position in order args appear. */ | |
1108 | int argpos; | |
1109 | ||
4fc026cd | 1110 | struct args_size alignment_pad; |
d7cdf113 JL |
1111 | int i; |
1112 | tree p; | |
f725a3ec | 1113 | |
d7cdf113 JL |
1114 | args_size->constant = 0; |
1115 | args_size->var = 0; | |
1116 | ||
1117 | /* In this loop, we consider args in the order they are written. | |
1118 | We fill up ARGS from the front or from the back if necessary | |
1119 | so that in any case the first arg to be pushed ends up at the front. */ | |
1120 | ||
f73ad30e JH |
1121 | if (PUSH_ARGS_REVERSED) |
1122 | { | |
1123 | i = num_actuals - 1, inc = -1; | |
1124 | /* In this case, must reverse order of args | |
1125 | so that we compute and push the last arg first. */ | |
1126 | } | |
1127 | else | |
1128 | { | |
1129 | i = 0, inc = 1; | |
1130 | } | |
d7cdf113 JL |
1131 | |
1132 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
1133 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
1134 | { | |
1135 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
1136 | int unsignedp; | |
1137 | enum machine_mode mode; | |
1138 | ||
1139 | args[i].tree_value = TREE_VALUE (p); | |
1140 | ||
1141 | /* Replace erroneous argument with constant zero. */ | |
d0f062fb | 1142 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1143 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1144 | ||
1145 | /* If TYPE is a transparent union, pass things the way we would | |
1146 | pass the first field of the union. We have already verified that | |
1147 | the modes are the same. */ | |
2bf105ab | 1148 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
d7cdf113 JL |
1149 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1150 | ||
1151 | /* Decide where to pass this arg. | |
1152 | ||
1153 | args[i].reg is nonzero if all or part is passed in registers. | |
1154 | ||
1155 | args[i].partial is nonzero if part but not all is passed in registers, | |
1156 | and the exact value says how many words are passed in registers. | |
1157 | ||
1158 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1159 | computed on the stack. It may then be loaded back into registers | |
1160 | if args[i].reg is nonzero. | |
1161 | ||
1162 | These decisions are driven by the FUNCTION_... macros and must agree | |
1163 | with those made by function.c. */ | |
1164 | ||
1165 | /* See if this argument should be passed by invisible reference. */ | |
1166 | if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST | |
1167 | && contains_placeholder_p (TYPE_SIZE (type))) | |
1168 | || TREE_ADDRESSABLE (type) | |
1169 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
959f3a06 | 1170 | || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1171 | type, argpos < n_named_args) |
1172 | #endif | |
1173 | ) | |
1174 | { | |
1175 | /* If we're compiling a thunk, pass through invisible | |
1176 | references instead of making a copy. */ | |
1177 | if (current_function_is_thunk | |
1178 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
959f3a06 | 1179 | || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1180 | type, argpos < n_named_args) |
1181 | /* If it's in a register, we must make a copy of it too. */ | |
1182 | /* ??? Is this a sufficient test? Is there a better one? */ | |
1183 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
1184 | && REG_P (DECL_RTL (args[i].tree_value))) | |
1185 | && ! TREE_ADDRESSABLE (type)) | |
1186 | #endif | |
1187 | ) | |
1188 | { | |
1189 | /* C++ uses a TARGET_EXPR to indicate that we want to make a | |
1190 | new object from the argument. If we are passing by | |
1191 | invisible reference, the callee will do that for us, so we | |
1192 | can strip off the TARGET_EXPR. This is not always safe, | |
1193 | but it is safe in the only case where this is a useful | |
1194 | optimization; namely, when the argument is a plain object. | |
1195 | In that case, the frontend is just asking the backend to | |
f725a3ec KH |
1196 | make a bitwise copy of the argument. */ |
1197 | ||
d7cdf113 | 1198 | if (TREE_CODE (args[i].tree_value) == TARGET_EXPR |
2f939d94 | 1199 | && (DECL_P (TREE_OPERAND (args[i].tree_value, 1))) |
d7cdf113 JL |
1200 | && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1)))) |
1201 | args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1); | |
1202 | ||
1203 | args[i].tree_value = build1 (ADDR_EXPR, | |
1204 | build_pointer_type (type), | |
1205 | args[i].tree_value); | |
1206 | type = build_pointer_type (type); | |
1207 | } | |
1208 | else | |
1209 | { | |
1210 | /* We make a copy of the object and pass the address to the | |
1211 | function being called. */ | |
1212 | rtx copy; | |
1213 | ||
d0f062fb | 1214 | if (!COMPLETE_TYPE_P (type) |
d7cdf113 JL |
1215 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1216 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
05bccae2 RK |
1217 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1218 | STACK_CHECK_MAX_VAR_SIZE)))) | |
d7cdf113 JL |
1219 | { |
1220 | /* This is a variable-sized object. Make space on the stack | |
1221 | for it. */ | |
1222 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1223 | ||
1224 | if (*old_stack_level == 0) | |
1225 | { | |
1226 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1227 | *old_pending_adj = pending_stack_adjust; | |
1228 | pending_stack_adjust = 0; | |
1229 | } | |
1230 | ||
1231 | copy = gen_rtx_MEM (BLKmode, | |
3bdf5ad1 RK |
1232 | allocate_dynamic_stack_space |
1233 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1234 | set_mem_attributes (copy, type, 1); | |
d7cdf113 JL |
1235 | } |
1236 | else | |
3bdf5ad1 | 1237 | copy = assign_temp (type, 0, 1, 0); |
d7cdf113 JL |
1238 | |
1239 | store_expr (args[i].tree_value, copy, 0); | |
2a8f6b90 | 1240 | *ecf_flags &= ~(ECF_CONST | ECF_PURE); |
d7cdf113 JL |
1241 | |
1242 | args[i].tree_value = build1 (ADDR_EXPR, | |
1243 | build_pointer_type (type), | |
1244 | make_tree (type, copy)); | |
1245 | type = build_pointer_type (type); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | mode = TYPE_MODE (type); | |
1250 | unsignedp = TREE_UNSIGNED (type); | |
1251 | ||
1252 | #ifdef PROMOTE_FUNCTION_ARGS | |
1253 | mode = promote_mode (type, mode, &unsignedp, 1); | |
1254 | #endif | |
1255 | ||
1256 | args[i].unsignedp = unsignedp; | |
1257 | args[i].mode = mode; | |
7d167afd | 1258 | |
099e9712 JH |
1259 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1260 | argpos < n_named_args); | |
7d167afd JJ |
1261 | #ifdef FUNCTION_INCOMING_ARG |
1262 | /* If this is a sibling call and the machine has register windows, the | |
1263 | register window has to be unwinded before calling the routine, so | |
1264 | arguments have to go into the incoming registers. */ | |
099e9712 | 1265 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
f725a3ec | 1266 | argpos < n_named_args); |
099e9712 JH |
1267 | #else |
1268 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1269 | #endif |
7d167afd | 1270 | |
d7cdf113 JL |
1271 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
1272 | if (args[i].reg) | |
1273 | args[i].partial | |
959f3a06 | 1274 | = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type, |
d7cdf113 JL |
1275 | argpos < n_named_args); |
1276 | #endif | |
1277 | ||
1278 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); | |
1279 | ||
1280 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1281 | it means that we are to pass this arg in the register(s) designated | |
1282 | by the PARALLEL, but also to pass it in the stack. */ | |
1283 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1284 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1285 | args[i].pass_on_stack = 1; | |
1286 | ||
1287 | /* If this is an addressable type, we must preallocate the stack | |
1288 | since we must evaluate the object into its final location. | |
1289 | ||
1290 | If this is to be passed in both registers and the stack, it is simpler | |
1291 | to preallocate. */ | |
1292 | if (TREE_ADDRESSABLE (type) | |
1293 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1294 | *must_preallocate = 1; | |
1295 | ||
1296 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1297 | we cannot consider this function call constant. */ | |
1298 | if (TREE_ADDRESSABLE (type)) | |
2a8f6b90 | 1299 | *ecf_flags &= ~(ECF_CONST | ECF_PURE); |
d7cdf113 JL |
1300 | |
1301 | /* Compute the stack-size of this argument. */ | |
1302 | if (args[i].reg == 0 || args[i].partial != 0 | |
1303 | || reg_parm_stack_space > 0 | |
1304 | || args[i].pass_on_stack) | |
1305 | locate_and_pad_parm (mode, type, | |
1306 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1307 | 1, | |
1308 | #else | |
1309 | args[i].reg != 0, | |
1310 | #endif | |
1311 | fndecl, args_size, &args[i].offset, | |
4fc026cd | 1312 | &args[i].size, &alignment_pad); |
d7cdf113 JL |
1313 | |
1314 | #ifndef ARGS_GROW_DOWNWARD | |
1315 | args[i].slot_offset = *args_size; | |
1316 | #endif | |
1317 | ||
4fc026cd CM |
1318 | args[i].alignment_pad = alignment_pad; |
1319 | ||
d7cdf113 JL |
1320 | /* If a part of the arg was put into registers, |
1321 | don't include that part in the amount pushed. */ | |
1322 | if (reg_parm_stack_space == 0 && ! args[i].pass_on_stack) | |
1323 | args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) | |
1324 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
1325 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
f725a3ec | 1326 | |
d7cdf113 JL |
1327 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1328 | ||
1329 | args_size->constant += args[i].size.constant; | |
1330 | if (args[i].size.var) | |
1331 | { | |
1332 | ADD_PARM_SIZE (*args_size, args[i].size.var); | |
1333 | } | |
1334 | ||
1335 | /* Since the slot offset points to the bottom of the slot, | |
1336 | we must record it after incrementing if the args grow down. */ | |
1337 | #ifdef ARGS_GROW_DOWNWARD | |
1338 | args[i].slot_offset = *args_size; | |
1339 | ||
1340 | args[i].slot_offset.constant = -args_size->constant; | |
1341 | if (args_size->var) | |
fed3cef0 | 1342 | SUB_PARM_SIZE (args[i].slot_offset, args_size->var); |
d7cdf113 JL |
1343 | #endif |
1344 | ||
1345 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1346 | have been used, etc. */ | |
1347 | ||
959f3a06 | 1348 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
d7cdf113 JL |
1349 | argpos < n_named_args); |
1350 | } | |
1351 | } | |
1352 | ||
599f37b6 JL |
1353 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1354 | Return the original constant component of the argument block's size. | |
1355 | ||
1356 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1357 | for arguments passed in registers. */ | |
1358 | ||
1359 | static int | |
c2f8b491 | 1360 | compute_argument_block_size (reg_parm_stack_space, args_size, |
f725a3ec | 1361 | preferred_stack_boundary) |
599f37b6 JL |
1362 | int reg_parm_stack_space; |
1363 | struct args_size *args_size; | |
c2f8b491 | 1364 | int preferred_stack_boundary ATTRIBUTE_UNUSED; |
599f37b6 JL |
1365 | { |
1366 | int unadjusted_args_size = args_size->constant; | |
1367 | ||
f73ad30e JH |
1368 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1369 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
1370 | backends from generating missaligned frame sizes. */ | |
1371 | #ifdef STACK_BOUNDARY | |
1372 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) | |
1373 | preferred_stack_boundary = STACK_BOUNDARY; | |
1374 | #endif | |
1375 | ||
599f37b6 JL |
1376 | /* Compute the actual size of the argument block required. The variable |
1377 | and constant sizes must be combined, the size may have to be rounded, | |
1378 | and there may be a minimum required size. */ | |
1379 | ||
1380 | if (args_size->var) | |
1381 | { | |
1382 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1383 | args_size->constant = 0; | |
1384 | ||
1385 | #ifdef PREFERRED_STACK_BOUNDARY | |
c2f8b491 JH |
1386 | preferred_stack_boundary /= BITS_PER_UNIT; |
1387 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1388 | { |
1389 | /* We don't handle this case yet. To handle it correctly we have | |
f725a3ec | 1390 | to add the delta, round and substract the delta. |
1503a7ec JH |
1391 | Currently no machine description requires this support. */ |
1392 | if (stack_pointer_delta & (preferred_stack_boundary - 1)) | |
f725a3ec | 1393 | abort (); |
1503a7ec JH |
1394 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1395 | } | |
599f37b6 JL |
1396 | #endif |
1397 | ||
1398 | if (reg_parm_stack_space > 0) | |
1399 | { | |
1400 | args_size->var | |
1401 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1402 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1403 | |
1404 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1405 | /* The area corresponding to register parameters is not to count in | |
1406 | the size of the block we need. So make the adjustment. */ | |
1407 | args_size->var | |
1408 | = size_binop (MINUS_EXPR, args_size->var, | |
fed3cef0 | 1409 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1410 | #endif |
1411 | } | |
1412 | } | |
1413 | else | |
1414 | { | |
1415 | #ifdef PREFERRED_STACK_BOUNDARY | |
c2f8b491 | 1416 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1417 | if (preferred_stack_boundary < 1) |
1418 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1419 | args_size->constant = (((args_size->constant |
1503a7ec | 1420 | + stack_pointer_delta |
c2f8b491 JH |
1421 | + preferred_stack_boundary - 1) |
1422 | / preferred_stack_boundary | |
1423 | * preferred_stack_boundary) | |
1503a7ec | 1424 | - stack_pointer_delta); |
599f37b6 JL |
1425 | #endif |
1426 | ||
1427 | args_size->constant = MAX (args_size->constant, | |
1428 | reg_parm_stack_space); | |
1429 | ||
1430 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1431 | if (reg_parm_stack_space == 0) | |
1432 | args_size->constant = 0; | |
1433 | #endif | |
1434 | ||
1435 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1436 | args_size->constant -= reg_parm_stack_space; | |
1437 | #endif | |
1438 | } | |
1439 | return unadjusted_args_size; | |
1440 | } | |
1441 | ||
19832c77 | 1442 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1443 | |
f2d33f13 | 1444 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1445 | |
cc0b1adc JL |
1446 | NUM_ACTUALS is the number of arguments. |
1447 | ||
f725a3ec KH |
1448 | ARGS is an array containing information for each argument; this |
1449 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1450 | precomputed argument. */ | |
cc0b1adc JL |
1451 | |
1452 | static void | |
40d6e956 | 1453 | precompute_arguments (flags, num_actuals, args) |
f2d33f13 | 1454 | int flags; |
cc0b1adc JL |
1455 | int num_actuals; |
1456 | struct arg_data *args; | |
cc0b1adc JL |
1457 | { |
1458 | int i; | |
1459 | ||
1460 | /* If this function call is cse'able, precompute all the parameters. | |
1461 | Note that if the parameter is constructed into a temporary, this will | |
1462 | cause an additional copy because the parameter will be constructed | |
1463 | into a temporary location and then copied into the outgoing arguments. | |
1464 | If a parameter contains a call to alloca and this function uses the | |
1465 | stack, precompute the parameter. */ | |
1466 | ||
1467 | /* If we preallocated the stack space, and some arguments must be passed | |
1468 | on the stack, then we must precompute any parameter which contains a | |
1469 | function call which will store arguments on the stack. | |
1470 | Otherwise, evaluating the parameter may clobber previous parameters | |
40d6e956 JH |
1471 | which have already been stored into the stack. (we have code to avoid |
1472 | such case by saving the ougoing stack arguments, but it results in | |
1473 | worse code) */ | |
cc0b1adc JL |
1474 | |
1475 | for (i = 0; i < num_actuals; i++) | |
2a8f6b90 | 1476 | if ((flags & (ECF_CONST | ECF_PURE)) |
40d6e956 | 1477 | || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS)) |
cc0b1adc | 1478 | { |
ddef6bc7 JJ |
1479 | enum machine_mode mode; |
1480 | ||
cc0b1adc JL |
1481 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
1482 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) | |
1483 | abort (); | |
1484 | ||
1485 | push_temp_slots (); | |
1486 | ||
47841d1b | 1487 | args[i].value |
cc0b1adc JL |
1488 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1489 | ||
1490 | preserve_temp_slots (args[i].value); | |
1491 | pop_temp_slots (); | |
1492 | ||
1493 | /* ANSI doesn't require a sequence point here, | |
1494 | but PCC has one, so this will avoid some problems. */ | |
1495 | emit_queue (); | |
1496 | ||
1497 | args[i].initial_value = args[i].value | |
47841d1b | 1498 | = protect_from_queue (args[i].value, 0); |
cc0b1adc | 1499 | |
ddef6bc7 JJ |
1500 | mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); |
1501 | if (mode != args[i].mode) | |
47841d1b JJ |
1502 | { |
1503 | args[i].value | |
ddef6bc7 | 1504 | = convert_modes (args[i].mode, mode, |
47841d1b JJ |
1505 | args[i].value, args[i].unsignedp); |
1506 | #ifdef PROMOTE_FOR_CALL_ONLY | |
1507 | /* CSE will replace this only if it contains args[i].value | |
1508 | pseudo, so convert it down to the declared mode using | |
1509 | a SUBREG. */ | |
1510 | if (GET_CODE (args[i].value) == REG | |
1511 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1512 | { | |
1513 | args[i].initial_value | |
ddef6bc7 | 1514 | = gen_lowpart_SUBREG (mode, args[i].value); |
47841d1b JJ |
1515 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; |
1516 | SUBREG_PROMOTED_UNSIGNED_P (args[i].initial_value) | |
1517 | = args[i].unsignedp; | |
1518 | } | |
1519 | #endif | |
1520 | } | |
cc0b1adc JL |
1521 | } |
1522 | } | |
1523 | ||
0f9b3ea6 JL |
1524 | /* Given the current state of MUST_PREALLOCATE and information about |
1525 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1526 | compute and return the final value for MUST_PREALLOCATE. */ | |
1527 | ||
1528 | static int | |
1529 | finalize_must_preallocate (must_preallocate, num_actuals, args, args_size) | |
1530 | int must_preallocate; | |
1531 | int num_actuals; | |
1532 | struct arg_data *args; | |
1533 | struct args_size *args_size; | |
1534 | { | |
1535 | /* See if we have or want to preallocate stack space. | |
1536 | ||
1537 | If we would have to push a partially-in-regs parm | |
1538 | before other stack parms, preallocate stack space instead. | |
1539 | ||
1540 | If the size of some parm is not a multiple of the required stack | |
1541 | alignment, we must preallocate. | |
1542 | ||
1543 | If the total size of arguments that would otherwise create a copy in | |
1544 | a temporary (such as a CALL) is more than half the total argument list | |
1545 | size, preallocation is faster. | |
1546 | ||
1547 | Another reason to preallocate is if we have a machine (like the m88k) | |
1548 | where stack alignment is required to be maintained between every | |
1549 | pair of insns, not just when the call is made. However, we assume here | |
1550 | that such machines either do not have push insns (and hence preallocation | |
1551 | would occur anyway) or the problem is taken care of with | |
1552 | PUSH_ROUNDING. */ | |
1553 | ||
1554 | if (! must_preallocate) | |
1555 | { | |
1556 | int partial_seen = 0; | |
1557 | int copy_to_evaluate_size = 0; | |
1558 | int i; | |
1559 | ||
1560 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1561 | { | |
1562 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1563 | partial_seen = 1; | |
1564 | else if (partial_seen && args[i].reg == 0) | |
1565 | must_preallocate = 1; | |
1566 | ||
1567 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1568 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1569 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1570 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1571 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1572 | copy_to_evaluate_size | |
1573 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1574 | } | |
1575 | ||
1576 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1577 | && args_size->constant > 0) | |
1578 | must_preallocate = 1; | |
1579 | } | |
1580 | return must_preallocate; | |
1581 | } | |
599f37b6 | 1582 | |
a45bdd02 JL |
1583 | /* If we preallocated stack space, compute the address of each argument |
1584 | and store it into the ARGS array. | |
1585 | ||
f725a3ec | 1586 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1587 | validized when it is used. |
1588 | ||
1589 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1590 | ||
1591 | static void | |
1592 | compute_argument_addresses (args, argblock, num_actuals) | |
1593 | struct arg_data *args; | |
1594 | rtx argblock; | |
1595 | int num_actuals; | |
1596 | { | |
1597 | if (argblock) | |
1598 | { | |
1599 | rtx arg_reg = argblock; | |
1600 | int i, arg_offset = 0; | |
1601 | ||
1602 | if (GET_CODE (argblock) == PLUS) | |
1603 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1604 | ||
1605 | for (i = 0; i < num_actuals; i++) | |
1606 | { | |
1607 | rtx offset = ARGS_SIZE_RTX (args[i].offset); | |
1608 | rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); | |
1609 | rtx addr; | |
1610 | ||
1611 | /* Skip this parm if it will not be passed on the stack. */ | |
1612 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1613 | continue; | |
1614 | ||
1615 | if (GET_CODE (offset) == CONST_INT) | |
1616 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1617 | else | |
1618 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1619 | ||
1620 | addr = plus_constant (addr, arg_offset); | |
1621 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
3bdf5ad1 RK |
1622 | set_mem_attributes (args[i].stack, |
1623 | TREE_TYPE (args[i].tree_value), 1); | |
a45bdd02 JL |
1624 | |
1625 | if (GET_CODE (slot_offset) == CONST_INT) | |
1626 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1627 | else | |
1628 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1629 | ||
1630 | addr = plus_constant (addr, arg_offset); | |
1631 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
3bdf5ad1 RK |
1632 | set_mem_attributes (args[i].stack_slot, |
1633 | TREE_TYPE (args[i].tree_value), 1); | |
7ab923cc JJ |
1634 | |
1635 | /* Function incoming arguments may overlap with sibling call | |
1636 | outgoing arguments and we cannot allow reordering of reads | |
1637 | from function arguments with stores to outgoing arguments | |
1638 | of sibling calls. */ | |
ba4828e0 RK |
1639 | set_mem_alias_set (args[i].stack, 0); |
1640 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1641 | } |
1642 | } | |
1643 | } | |
f725a3ec | 1644 | |
a45bdd02 JL |
1645 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1646 | in a call instruction. | |
1647 | ||
1648 | FNDECL is the tree node for the target function. For an indirect call | |
1649 | FNDECL will be NULL_TREE. | |
1650 | ||
1651 | EXP is the CALL_EXPR for this call. */ | |
1652 | ||
1653 | static rtx | |
1654 | rtx_for_function_call (fndecl, exp) | |
1655 | tree fndecl; | |
1656 | tree exp; | |
1657 | { | |
1658 | rtx funexp; | |
1659 | ||
1660 | /* Get the function to call, in the form of RTL. */ | |
1661 | if (fndecl) | |
1662 | { | |
1663 | /* If this is the first use of the function, see if we need to | |
1664 | make an external definition for it. */ | |
1665 | if (! TREE_USED (fndecl)) | |
1666 | { | |
1667 | assemble_external (fndecl); | |
1668 | TREE_USED (fndecl) = 1; | |
1669 | } | |
1670 | ||
1671 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1672 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1673 | } | |
1674 | else | |
1675 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1676 | { | |
91ab1046 | 1677 | rtx funaddr; |
a45bdd02 | 1678 | push_temp_slots (); |
f725a3ec KH |
1679 | funaddr = funexp = |
1680 | expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); | |
1681 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ | |
a45bdd02 JL |
1682 | |
1683 | /* Check the function is executable. */ | |
1684 | if (current_function_check_memory_usage) | |
91ab1046 DT |
1685 | { |
1686 | #ifdef POINTERS_EXTEND_UNSIGNED | |
1687 | /* It might be OK to convert funexp in place, but there's | |
1688 | a lot going on between here and when it happens naturally | |
f725a3ec KH |
1689 | that this seems safer. */ |
1690 | funaddr = convert_memory_address (Pmode, funexp); | |
91ab1046 | 1691 | #endif |
ebb1b59a BS |
1692 | emit_library_call (chkr_check_exec_libfunc, LCT_CONST_MAKE_BLOCK, |
1693 | VOIDmode, 1, funaddr, Pmode); | |
91ab1046 | 1694 | } |
a45bdd02 JL |
1695 | emit_queue (); |
1696 | } | |
1697 | return funexp; | |
1698 | } | |
1699 | ||
21a3b983 JL |
1700 | /* Do the register loads required for any wholly-register parms or any |
1701 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1702 | expressions were already evaluated. |
21a3b983 JL |
1703 | |
1704 | Mark all register-parms as living through the call, putting these USE | |
1705 | insns in the CALL_INSN_FUNCTION_USAGE field. */ | |
1706 | ||
1707 | static void | |
099e9712 | 1708 | load_register_parameters (args, num_actuals, call_fusage, flags) |
21a3b983 JL |
1709 | struct arg_data *args; |
1710 | int num_actuals; | |
1711 | rtx *call_fusage; | |
099e9712 | 1712 | int flags; |
21a3b983 JL |
1713 | { |
1714 | int i, j; | |
1715 | ||
1716 | #ifdef LOAD_ARGS_REVERSED | |
1717 | for (i = num_actuals - 1; i >= 0; i--) | |
1718 | #else | |
1719 | for (i = 0; i < num_actuals; i++) | |
1720 | #endif | |
1721 | { | |
099e9712 JH |
1722 | rtx reg = ((flags & ECF_SIBCALL) |
1723 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1724 | int partial = args[i].partial; |
1725 | int nregs; | |
1726 | ||
1727 | if (reg) | |
1728 | { | |
1729 | /* Set to non-negative if must move a word at a time, even if just | |
1730 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1731 | we just use a normal move insn. This value can be zero if the | |
1732 | argument is a zero size structure with no fields. */ | |
1733 | nregs = (partial ? partial | |
1734 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1735 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) | |
1736 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
1737 | : -1)); | |
1738 | ||
1739 | /* Handle calls that pass values in multiple non-contiguous | |
1740 | locations. The Irix 6 ABI has examples of this. */ | |
1741 | ||
1742 | if (GET_CODE (reg) == PARALLEL) | |
19caa751 RK |
1743 | emit_group_load (reg, args[i].value, |
1744 | int_size_in_bytes (TREE_TYPE (args[i].tree_value)), | |
1745 | TYPE_ALIGN (TREE_TYPE (args[i].tree_value))); | |
21a3b983 JL |
1746 | |
1747 | /* If simple case, just do move. If normal partial, store_one_arg | |
1748 | has already loaded the register for us. In all other cases, | |
1749 | load the register(s) from memory. */ | |
1750 | ||
1751 | else if (nregs == -1) | |
1752 | emit_move_insn (reg, args[i].value); | |
1753 | ||
1754 | /* If we have pre-computed the values to put in the registers in | |
1755 | the case of non-aligned structures, copy them in now. */ | |
1756 | ||
1757 | else if (args[i].n_aligned_regs != 0) | |
1758 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1759 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1760 | args[i].aligned_regs[j]); | |
1761 | ||
1762 | else if (partial == 0 || args[i].pass_on_stack) | |
1763 | move_block_to_reg (REGNO (reg), | |
1764 | validize_mem (args[i].value), nregs, | |
1765 | args[i].mode); | |
1766 | ||
1767 | /* Handle calls that pass values in multiple non-contiguous | |
1768 | locations. The Irix 6 ABI has examples of this. */ | |
1769 | if (GET_CODE (reg) == PARALLEL) | |
1770 | use_group_regs (call_fusage, reg); | |
1771 | else if (nregs == -1) | |
1772 | use_reg (call_fusage, reg); | |
1773 | else | |
1774 | use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); | |
1775 | } | |
1776 | } | |
1777 | } | |
1778 | ||
ea11ca7e | 1779 | /* Try to integrate function. See expand_inline_function for documentation |
f2d33f13 JH |
1780 | about the parameters. */ |
1781 | ||
1782 | static rtx | |
1783 | try_to_integrate (fndecl, actparms, target, ignore, type, structure_value_addr) | |
1784 | tree fndecl; | |
1785 | tree actparms; | |
1786 | rtx target; | |
1787 | int ignore; | |
1788 | tree type; | |
1789 | rtx structure_value_addr; | |
1790 | { | |
1791 | rtx temp; | |
1792 | rtx before_call; | |
1793 | int i; | |
1794 | rtx old_stack_level = 0; | |
7657ad0a | 1795 | int reg_parm_stack_space = 0; |
f2d33f13 JH |
1796 | |
1797 | #ifdef REG_PARM_STACK_SPACE | |
1798 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1799 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
1800 | #else | |
1801 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
1802 | #endif | |
1803 | #endif | |
1804 | ||
1805 | before_call = get_last_insn (); | |
1806 | ||
ea11ca7e JM |
1807 | timevar_push (TV_INTEGRATION); |
1808 | ||
f2d33f13 JH |
1809 | temp = expand_inline_function (fndecl, actparms, target, |
1810 | ignore, type, | |
1811 | structure_value_addr); | |
1812 | ||
ea11ca7e JM |
1813 | timevar_pop (TV_INTEGRATION); |
1814 | ||
f2d33f13 JH |
1815 | /* If inlining succeeded, return. */ |
1816 | if (temp != (rtx) (HOST_WIDE_INT) - 1) | |
1817 | { | |
1818 | if (ACCUMULATE_OUTGOING_ARGS) | |
1819 | { | |
1820 | /* If the outgoing argument list must be preserved, push | |
1821 | the stack before executing the inlined function if it | |
1822 | makes any calls. */ | |
1823 | ||
1824 | for (i = reg_parm_stack_space - 1; i >= 0; i--) | |
1825 | if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) | |
1826 | break; | |
1827 | ||
1828 | if (stack_arg_under_construction || i >= 0) | |
1829 | { | |
1830 | rtx first_insn | |
1831 | = before_call ? NEXT_INSN (before_call) : get_insns (); | |
1832 | rtx insn = NULL_RTX, seq; | |
1833 | ||
1834 | /* Look for a call in the inline function code. | |
1835 | If DECL_SAVED_INSNS (fndecl)->outgoing_args_size is | |
1836 | nonzero then there is a call and it is not necessary | |
1837 | to scan the insns. */ | |
1838 | ||
1839 | if (DECL_SAVED_INSNS (fndecl)->outgoing_args_size == 0) | |
1840 | for (insn = first_insn; insn; insn = NEXT_INSN (insn)) | |
1841 | if (GET_CODE (insn) == CALL_INSN) | |
1842 | break; | |
1843 | ||
1844 | if (insn) | |
1845 | { | |
1846 | /* Reserve enough stack space so that the largest | |
1847 | argument list of any function call in the inline | |
1848 | function does not overlap the argument list being | |
1849 | evaluated. This is usually an overestimate because | |
1850 | allocate_dynamic_stack_space reserves space for an | |
1851 | outgoing argument list in addition to the requested | |
1852 | space, but there is no way to ask for stack space such | |
1853 | that an argument list of a certain length can be | |
f725a3ec | 1854 | safely constructed. |
f2d33f13 JH |
1855 | |
1856 | Add the stack space reserved for register arguments, if | |
1857 | any, in the inline function. What is really needed is the | |
1858 | largest value of reg_parm_stack_space in the inline | |
1859 | function, but that is not available. Using the current | |
1860 | value of reg_parm_stack_space is wrong, but gives | |
1861 | correct results on all supported machines. */ | |
1862 | ||
1863 | int adjust = (DECL_SAVED_INSNS (fndecl)->outgoing_args_size | |
1864 | + reg_parm_stack_space); | |
1865 | ||
1866 | start_sequence (); | |
1867 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
1868 | allocate_dynamic_stack_space (GEN_INT (adjust), | |
1869 | NULL_RTX, BITS_PER_UNIT); | |
1870 | seq = get_insns (); | |
1871 | end_sequence (); | |
1872 | emit_insns_before (seq, first_insn); | |
1873 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1874 | } | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
1879 | checks in store_expr. They can be equivalent but not equal in the | |
1880 | case of a function that returns BLKmode. */ | |
1881 | if (temp != target && rtx_equal_p (temp, target)) | |
1882 | return target; | |
1883 | return temp; | |
1884 | } | |
1885 | ||
1886 | /* If inlining failed, mark FNDECL as needing to be compiled | |
1887 | separately after all. If function was declared inline, | |
1888 | give a warning. */ | |
1889 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
1890 | && optimize > 0 && !TREE_ADDRESSABLE (fndecl)) | |
1891 | { | |
1892 | warning_with_decl (fndecl, "inlining failed in call to `%s'"); | |
1893 | warning ("called from here"); | |
1894 | } | |
1895 | mark_addressable (fndecl); | |
1896 | return (rtx) (HOST_WIDE_INT) - 1; | |
1897 | } | |
1898 | ||
739fb049 MM |
1899 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1900 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1901 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1902 | arguments. So, we compute an adjust to the stack pointer for an |
1903 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1904 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1905 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1906 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1907 | |
ce48579b | 1908 | static int |
739fb049 MM |
1909 | combine_pending_stack_adjustment_and_call (unadjusted_args_size, |
1910 | args_size, | |
1911 | preferred_unit_stack_boundary) | |
1912 | int unadjusted_args_size; | |
1913 | struct args_size *args_size; | |
1914 | int preferred_unit_stack_boundary; | |
1915 | { | |
1916 | /* The number of bytes to pop so that the stack will be | |
1917 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1918 | HOST_WIDE_INT adjustment; | |
1919 | /* The alignment of the stack after the arguments are pushed, if we | |
1920 | just pushed the arguments without adjust the stack here. */ | |
1921 | HOST_WIDE_INT unadjusted_alignment; | |
1922 | ||
f725a3ec | 1923 | unadjusted_alignment |
739fb049 MM |
1924 | = ((stack_pointer_delta + unadjusted_args_size) |
1925 | % preferred_unit_stack_boundary); | |
1926 | ||
1927 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1928 | as possible -- leaving just enough left to cancel out the | |
1929 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1930 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1931 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1932 | ||
1933 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
1934 | unadjusted_alignment |
1935 | = (unadjusted_alignment | |
739fb049 MM |
1936 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1937 | adjustment = pending_stack_adjust; | |
1938 | /* Push enough additional bytes that the stack will be aligned | |
1939 | after the arguments are pushed. */ | |
e079dcdb HB |
1940 | if (preferred_unit_stack_boundary > 1) |
1941 | { | |
3e555c7d | 1942 | if (unadjusted_alignment > 0) |
f725a3ec | 1943 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 1944 | else |
f725a3ec | 1945 | adjustment += unadjusted_alignment; |
e079dcdb | 1946 | } |
f725a3ec | 1947 | |
739fb049 MM |
1948 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1949 | bytes after the call. The right number is the entire | |
1950 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1951 | by the arguments in the first place. */ | |
f725a3ec | 1952 | args_size->constant |
739fb049 MM |
1953 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1954 | ||
ce48579b | 1955 | return adjustment; |
739fb049 MM |
1956 | } |
1957 | ||
c67846f2 JJ |
1958 | /* Scan X expression if it does not dereference any argument slots |
1959 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1960 | bitmap). | |
1961 | Return non-zero if X expression dereferences such argument slots, | |
1962 | zero otherwise. */ | |
1963 | ||
1964 | static int | |
1965 | check_sibcall_argument_overlap_1 (x) | |
1966 | rtx x; | |
1967 | { | |
1968 | RTX_CODE code; | |
1969 | int i, j; | |
1970 | unsigned int k; | |
1971 | const char *fmt; | |
1972 | ||
1973 | if (x == NULL_RTX) | |
1974 | return 0; | |
1975 | ||
1976 | code = GET_CODE (x); | |
1977 | ||
1978 | if (code == MEM) | |
1979 | { | |
1980 | if (XEXP (x, 0) == current_function_internal_arg_pointer) | |
1981 | i = 0; | |
4c6b3b2a JJ |
1982 | else if (GET_CODE (XEXP (x, 0)) == PLUS |
1983 | && XEXP (XEXP (x, 0), 0) == | |
1984 | current_function_internal_arg_pointer | |
1985 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
c67846f2 JJ |
1986 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
1987 | else | |
1988 | return 0; | |
1989 | ||
d60eab50 AO |
1990 | #ifdef ARGS_GROW_DOWNWARD |
1991 | i = -i - GET_MODE_SIZE (GET_MODE (x)); | |
1992 | #endif | |
1993 | ||
c67846f2 JJ |
1994 | for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++) |
1995 | if (i + k < stored_args_map->n_bits | |
1996 | && TEST_BIT (stored_args_map, i + k)) | |
1997 | return 1; | |
1998 | ||
1999 | return 0; | |
2000 | } | |
2001 | ||
f725a3ec | 2002 | /* Scan all subexpressions. */ |
c67846f2 JJ |
2003 | fmt = GET_RTX_FORMAT (code); |
2004 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
2005 | { | |
2006 | if (*fmt == 'e') | |
f725a3ec KH |
2007 | { |
2008 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
2009 | return 1; | |
2010 | } | |
c67846f2 | 2011 | else if (*fmt == 'E') |
f725a3ec KH |
2012 | { |
2013 | for (j = 0; j < XVECLEN (x, i); j++) | |
2014 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
2015 | return 1; | |
2016 | } | |
c67846f2 JJ |
2017 | } |
2018 | return 0; | |
c67846f2 JJ |
2019 | } |
2020 | ||
2021 | /* Scan sequence after INSN if it does not dereference any argument slots | |
2022 | we already clobbered by tail call arguments (as noted in stored_args_map | |
2023 | bitmap). Add stack slots for ARG to stored_args_map bitmap afterwards. | |
2024 | Return non-zero if sequence after INSN dereferences such argument slots, | |
2025 | zero otherwise. */ | |
2026 | ||
2027 | static int | |
2028 | check_sibcall_argument_overlap (insn, arg) | |
2029 | rtx insn; | |
2030 | struct arg_data *arg; | |
f725a3ec | 2031 | { |
c67846f2 JJ |
2032 | int low, high; |
2033 | ||
2034 | if (insn == NULL_RTX) | |
2035 | insn = get_insns (); | |
2036 | else | |
2037 | insn = NEXT_INSN (insn); | |
2038 | ||
2039 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
2040 | if (INSN_P (insn) |
2041 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
2042 | break; |
2043 | ||
d60eab50 AO |
2044 | #ifdef ARGS_GROW_DOWNWARD |
2045 | low = -arg->offset.constant - arg->size.constant; | |
2046 | #else | |
c67846f2 | 2047 | low = arg->offset.constant; |
d60eab50 AO |
2048 | #endif |
2049 | ||
c67846f2 JJ |
2050 | for (high = low + arg->size.constant; low < high; low++) |
2051 | SET_BIT (stored_args_map, low); | |
2052 | return insn != NULL_RTX; | |
2053 | } | |
2054 | ||
51bbfa0c RS |
2055 | /* Generate all the code for a function call |
2056 | and return an rtx for its value. | |
2057 | Store the value in TARGET (specified as an rtx) if convenient. | |
2058 | If the value is stored in TARGET then TARGET is returned. | |
2059 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
2060 | ||
2061 | rtx | |
8129842c | 2062 | expand_call (exp, target, ignore) |
51bbfa0c RS |
2063 | tree exp; |
2064 | rtx target; | |
2065 | int ignore; | |
51bbfa0c | 2066 | { |
0a1c58a2 JL |
2067 | /* Nonzero if we are currently expanding a call. */ |
2068 | static int currently_expanding_call = 0; | |
2069 | ||
51bbfa0c RS |
2070 | /* List of actual parameters. */ |
2071 | tree actparms = TREE_OPERAND (exp, 1); | |
2072 | /* RTX for the function to be called. */ | |
2073 | rtx funexp; | |
0a1c58a2 JL |
2074 | /* Sequence of insns to perform a tail recursive "call". */ |
2075 | rtx tail_recursion_insns = NULL_RTX; | |
2076 | /* Sequence of insns to perform a normal "call". */ | |
2077 | rtx normal_call_insns = NULL_RTX; | |
2078 | /* Sequence of insns to perform a tail recursive "call". */ | |
2079 | rtx tail_call_insns = NULL_RTX; | |
51bbfa0c RS |
2080 | /* Data type of the function. */ |
2081 | tree funtype; | |
2082 | /* Declaration of the function being called, | |
2083 | or 0 if the function is computed (not known by name). */ | |
2084 | tree fndecl = 0; | |
0a1c58a2 | 2085 | rtx insn; |
099e9712 JH |
2086 | int try_tail_call = 1; |
2087 | int try_tail_recursion = 1; | |
0a1c58a2 | 2088 | int pass; |
51bbfa0c RS |
2089 | |
2090 | /* Register in which non-BLKmode value will be returned, | |
2091 | or 0 if no value or if value is BLKmode. */ | |
2092 | rtx valreg; | |
2093 | /* Address where we should return a BLKmode value; | |
2094 | 0 if value not BLKmode. */ | |
2095 | rtx structure_value_addr = 0; | |
2096 | /* Nonzero if that address is being passed by treating it as | |
2097 | an extra, implicit first parameter. Otherwise, | |
2098 | it is passed by being copied directly into struct_value_rtx. */ | |
2099 | int structure_value_addr_parm = 0; | |
2100 | /* Size of aggregate value wanted, or zero if none wanted | |
2101 | or if we are using the non-reentrant PCC calling convention | |
2102 | or expecting the value in registers. */ | |
e5e809f4 | 2103 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
2104 | /* Nonzero if called function returns an aggregate in memory PCC style, |
2105 | by returning the address of where to find it. */ | |
2106 | int pcc_struct_value = 0; | |
2107 | ||
2108 | /* Number of actual parameters in this call, including struct value addr. */ | |
2109 | int num_actuals; | |
2110 | /* Number of named args. Args after this are anonymous ones | |
2111 | and they must all go on the stack. */ | |
2112 | int n_named_args; | |
51bbfa0c RS |
2113 | |
2114 | /* Vector of information about each argument. | |
2115 | Arguments are numbered in the order they will be pushed, | |
2116 | not the order they are written. */ | |
2117 | struct arg_data *args; | |
2118 | ||
2119 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2120 | struct args_size args_size; | |
099e9712 | 2121 | struct args_size adjusted_args_size; |
51bbfa0c | 2122 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 2123 | int unadjusted_args_size; |
51bbfa0c RS |
2124 | /* Data on reg parms scanned so far. */ |
2125 | CUMULATIVE_ARGS args_so_far; | |
2126 | /* Nonzero if a reg parm has been scanned. */ | |
2127 | int reg_parm_seen; | |
efd65a8b | 2128 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 2129 | |
f725a3ec | 2130 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
2131 | If stack space is allocated for register parameters, but not by the |
2132 | caller, then it is preallocated in the fixed part of the stack frame. | |
2133 | So the entire argument block must then be preallocated (i.e., we | |
2134 | ignore PUSH_ROUNDING in that case). */ | |
2135 | ||
f73ad30e | 2136 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 2137 | |
f72aed24 | 2138 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
2139 | int reg_parm_stack_space = 0; |
2140 | ||
51bbfa0c RS |
2141 | /* Address of space preallocated for stack parms |
2142 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
2143 | rtx argblock = 0; | |
2144 | ||
f2d33f13 JH |
2145 | /* Mask of ECF_ flags. */ |
2146 | int flags = 0; | |
51bbfa0c RS |
2147 | /* Nonzero if this is a call to an inline function. */ |
2148 | int is_integrable = 0; | |
f73ad30e | 2149 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c RS |
2150 | /* Define the boundary of the register parm stack space that needs to be |
2151 | save, if any. */ | |
2152 | int low_to_save = -1, high_to_save; | |
2153 | rtx save_area = 0; /* Place that it is saved */ | |
2154 | #endif | |
2155 | ||
51bbfa0c RS |
2156 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2157 | char *initial_stack_usage_map = stack_usage_map; | |
a544cfd2 | 2158 | int old_stack_arg_under_construction = 0; |
51bbfa0c RS |
2159 | |
2160 | rtx old_stack_level = 0; | |
79be3418 | 2161 | int old_pending_adj = 0; |
51bbfa0c | 2162 | int old_inhibit_defer_pop = inhibit_defer_pop; |
1503a7ec | 2163 | int old_stack_allocated; |
0a1c58a2 | 2164 | rtx call_fusage; |
7393c642 | 2165 | register tree p = TREE_OPERAND (exp, 0); |
21a3b983 | 2166 | register int i; |
739fb049 MM |
2167 | /* The alignment of the stack, in bits. */ |
2168 | HOST_WIDE_INT preferred_stack_boundary; | |
2169 | /* The alignment of the stack, in bytes. */ | |
2170 | HOST_WIDE_INT preferred_unit_stack_boundary; | |
51bbfa0c | 2171 | |
7815214e RK |
2172 | /* The value of the function call can be put in a hard register. But |
2173 | if -fcheck-memory-usage, code which invokes functions (and thus | |
2174 | damages some hard registers) can be inserted before using the value. | |
2175 | So, target is always a pseudo-register in that case. */ | |
7d384cc0 | 2176 | if (current_function_check_memory_usage) |
7815214e RK |
2177 | target = 0; |
2178 | ||
f2d33f13 JH |
2179 | /* See if this is "nothrow" function call. */ |
2180 | if (TREE_NOTHROW (exp)) | |
2181 | flags |= ECF_NOTHROW; | |
2182 | ||
51bbfa0c RS |
2183 | /* See if we can find a DECL-node for the actual function. |
2184 | As a result, decide whether this is a call to an integrable function. */ | |
2185 | ||
39b0dce7 JM |
2186 | fndecl = get_callee_fndecl (exp); |
2187 | if (fndecl) | |
51bbfa0c | 2188 | { |
39b0dce7 JM |
2189 | if (!flag_no_inline |
2190 | && fndecl != current_function_decl | |
2191 | && DECL_INLINE (fndecl) | |
2192 | && DECL_SAVED_INSNS (fndecl) | |
2193 | && DECL_SAVED_INSNS (fndecl)->inlinable) | |
2194 | is_integrable = 1; | |
2195 | else if (! TREE_ADDRESSABLE (fndecl)) | |
51bbfa0c | 2196 | { |
39b0dce7 JM |
2197 | /* In case this function later becomes inlinable, |
2198 | record that there was already a non-inline call to it. | |
51bbfa0c | 2199 | |
39b0dce7 JM |
2200 | Use abstraction instead of setting TREE_ADDRESSABLE |
2201 | directly. */ | |
2202 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
2203 | && optimize > 0) | |
2204 | { | |
2205 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
2206 | warning ("called from here"); | |
51bbfa0c | 2207 | } |
39b0dce7 | 2208 | mark_addressable (fndecl); |
51bbfa0c | 2209 | } |
39b0dce7 JM |
2210 | |
2211 | flags |= flags_from_decl_or_type (fndecl); | |
51bbfa0c RS |
2212 | } |
2213 | ||
f725a3ec | 2214 | /* If we don't have specific function to call, see if we have a |
f2d33f13 | 2215 | attributes set in the type. */ |
39b0dce7 | 2216 | else |
7393c642 RK |
2217 | flags |= flags_from_decl_or_type (TREE_TYPE (TREE_TYPE (p))); |
2218 | ||
2219 | /* Mark if the function returns with the stack pointer depressed. */ | |
43db0363 RK |
2220 | if (TREE_CODE (TREE_TYPE (TREE_TYPE (p))) == FUNCTION_TYPE |
2221 | && TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (TREE_TYPE (p)))) | |
39b0dce7 | 2222 | { |
7393c642 | 2223 | flags |= ECF_SP_DEPRESSED; |
f725a3ec | 2224 | flags &= ~(ECF_PURE | ECF_CONST); |
39b0dce7 | 2225 | } |
fdff8c6d | 2226 | |
6f90e075 JW |
2227 | #ifdef REG_PARM_STACK_SPACE |
2228 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
2229 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
2230 | #else | |
2231 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
2232 | #endif | |
2233 | #endif | |
2234 | ||
f73ad30e JH |
2235 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2236 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
e5e809f4 JL |
2237 | must_preallocate = 1; |
2238 | #endif | |
2239 | ||
51bbfa0c RS |
2240 | /* Warn if this value is an aggregate type, |
2241 | regardless of which calling convention we are using for it. */ | |
05e3bdb9 | 2242 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
51bbfa0c RS |
2243 | warning ("function call has aggregate value"); |
2244 | ||
2245 | /* Set up a place to return a structure. */ | |
2246 | ||
2247 | /* Cater to broken compilers. */ | |
2248 | if (aggregate_value_p (exp)) | |
2249 | { | |
2250 | /* This call returns a big structure. */ | |
2a8f6b90 | 2251 | flags &= ~(ECF_CONST | ECF_PURE); |
51bbfa0c RS |
2252 | |
2253 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2254 | { |
2255 | pcc_struct_value = 1; | |
0dd532dc JW |
2256 | /* Easier than making that case work right. */ |
2257 | if (is_integrable) | |
2258 | { | |
2259 | /* In case this is a static function, note that it has been | |
2260 | used. */ | |
2261 | if (! TREE_ADDRESSABLE (fndecl)) | |
2262 | mark_addressable (fndecl); | |
2263 | is_integrable = 0; | |
2264 | } | |
9e7b1d0a RS |
2265 | } |
2266 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2267 | { | |
2268 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 2269 | |
9e7b1d0a RS |
2270 | if (target && GET_CODE (target) == MEM) |
2271 | structure_value_addr = XEXP (target, 0); | |
2272 | else | |
2273 | { | |
9e7b1d0a RS |
2274 | /* For variable-sized objects, we must be called with a target |
2275 | specified. If we were to allocate space on the stack here, | |
2276 | we would have no way of knowing when to free it. */ | |
1da68f56 | 2277 | rtx d = assign_temp (TREE_TYPE (exp), 1, 1, 1); |
51bbfa0c | 2278 | |
4361b41d MM |
2279 | mark_temp_addr_taken (d); |
2280 | structure_value_addr = XEXP (d, 0); | |
9e7b1d0a RS |
2281 | target = 0; |
2282 | } | |
2283 | } | |
2284 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2285 | } |
2286 | ||
2287 | /* If called function is inline, try to integrate it. */ | |
2288 | ||
2289 | if (is_integrable) | |
2290 | { | |
f2d33f13 JH |
2291 | rtx temp = try_to_integrate (fndecl, actparms, target, |
2292 | ignore, TREE_TYPE (exp), | |
2293 | structure_value_addr); | |
2294 | if (temp != (rtx) (HOST_WIDE_INT) - 1) | |
2295 | return temp; | |
51bbfa0c RS |
2296 | } |
2297 | ||
099e9712 JH |
2298 | /* Figure out the amount to which the stack should be aligned. */ |
2299 | #ifdef PREFERRED_STACK_BOUNDARY | |
2300 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
2301 | #else | |
2302 | preferred_stack_boundary = STACK_BOUNDARY; | |
2303 | #endif | |
2304 | ||
2305 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
2306 | funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
2307 | if (! POINTER_TYPE_P (funtype)) | |
2308 | abort (); | |
2309 | funtype = TREE_TYPE (funtype); | |
2310 | ||
2311 | /* See if this is a call to a function that can return more than once | |
2312 | or a call to longjmp or malloc. */ | |
2313 | flags |= special_function_p (fndecl, flags); | |
2314 | ||
2315 | if (flags & ECF_MAY_BE_ALLOCA) | |
2316 | current_function_calls_alloca = 1; | |
2317 | ||
2318 | /* If struct_value_rtx is 0, it means pass the address | |
2319 | as if it were an extra parameter. */ | |
2320 | if (structure_value_addr && struct_value_rtx == 0) | |
2321 | { | |
2322 | /* If structure_value_addr is a REG other than | |
2323 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2324 | is not a REG, we must always copy it into a register. | |
2325 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2326 | register in some cases. */ | |
2327 | rtx temp = (GET_CODE (structure_value_addr) != REG | |
2328 | || (ACCUMULATE_OUTGOING_ARGS | |
2329 | && stack_arg_under_construction | |
2330 | && structure_value_addr == virtual_outgoing_args_rtx) | |
2331 | ? copy_addr_to_reg (structure_value_addr) | |
2332 | : structure_value_addr); | |
2333 | ||
2334 | actparms | |
2335 | = tree_cons (error_mark_node, | |
2336 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2337 | temp), | |
2338 | actparms); | |
2339 | structure_value_addr_parm = 1; | |
2340 | } | |
2341 | ||
2342 | /* Count the arguments and set NUM_ACTUALS. */ | |
2343 | for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p)) | |
2344 | num_actuals++; | |
2345 | ||
2346 | /* Compute number of named args. | |
2347 | Normally, don't include the last named arg if anonymous args follow. | |
2348 | We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero. | |
2349 | (If no anonymous args follow, the result of list_length is actually | |
2350 | one too large. This is harmless.) | |
2351 | ||
2352 | If PRETEND_OUTGOING_VARARGS_NAMED is set and STRICT_ARGUMENT_NAMING is | |
2353 | zero, this machine will be able to place unnamed args that were | |
2354 | passed in registers into the stack. So treat all args as named. | |
2355 | This allows the insns emitting for a specific argument list to be | |
2356 | independent of the function declaration. | |
2357 | ||
2358 | If PRETEND_OUTGOING_VARARGS_NAMED is not set, we do not have any | |
2359 | reliable way to pass unnamed args in registers, so we must force | |
2360 | them into memory. */ | |
2361 | ||
2362 | if ((STRICT_ARGUMENT_NAMING | |
2363 | || ! PRETEND_OUTGOING_VARARGS_NAMED) | |
2364 | && TYPE_ARG_TYPES (funtype) != 0) | |
2365 | n_named_args | |
2366 | = (list_length (TYPE_ARG_TYPES (funtype)) | |
2367 | /* Don't include the last named arg. */ | |
2368 | - (STRICT_ARGUMENT_NAMING ? 0 : 1) | |
2369 | /* Count the struct value address, if it is passed as a parm. */ | |
2370 | + structure_value_addr_parm); | |
2371 | else | |
2372 | /* If we know nothing, treat all args as named. */ | |
2373 | n_named_args = num_actuals; | |
2374 | ||
2375 | /* Start updating where the next arg would go. | |
2376 | ||
2377 | On some machines (such as the PA) indirect calls have a different | |
2378 | calling convention than normal calls. The last argument in | |
2379 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2380 | or not. */ | |
2381 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, (fndecl == 0)); | |
2382 | ||
099e9712 | 2383 | /* Make a vector to hold all the information about each arg. */ |
f725a3ec | 2384 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); |
961192e1 | 2385 | memset ((char *) args, 0, num_actuals * sizeof (struct arg_data)); |
099e9712 | 2386 | |
d80d2d2a KH |
2387 | /* Build up entries in the ARGS array, compute the size of the |
2388 | arguments into ARGS_SIZE, etc. */ | |
099e9712 JH |
2389 | initialize_argument_information (num_actuals, args, &args_size, |
2390 | n_named_args, actparms, fndecl, | |
2391 | &args_so_far, reg_parm_stack_space, | |
2392 | &old_stack_level, &old_pending_adj, | |
2393 | &must_preallocate, &flags); | |
2394 | ||
2395 | if (args_size.var) | |
2396 | { | |
2397 | /* If this function requires a variable-sized argument list, don't | |
2398 | try to make a cse'able block for this call. We may be able to | |
2399 | do this eventually, but it is too complicated to keep track of | |
2400 | what insns go in the cse'able block and which don't. */ | |
2401 | ||
2402 | flags &= ~(ECF_CONST | ECF_PURE); | |
2403 | must_preallocate = 1; | |
2404 | } | |
2405 | ||
2406 | /* Now make final decision about preallocating stack space. */ | |
2407 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2408 | num_actuals, args, | |
2409 | &args_size); | |
2410 | ||
2411 | /* If the structure value address will reference the stack pointer, we | |
2412 | must stabilize it. We don't need to do this if we know that we are | |
2413 | not going to adjust the stack pointer in processing this call. */ | |
2414 | ||
2415 | if (structure_value_addr | |
2416 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2417 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2418 | structure_value_addr)) | |
2419 | && (args_size.var | |
2420 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2421 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2422 | |
194c7c45 RH |
2423 | /* Tail calls can make things harder to debug, and we're traditionally |
2424 | pushed these optimizations into -O2. Don't try if we're already | |
fb158467 JH |
2425 | expanding a call, as that means we're an argument. Don't try if |
2426 | there's cleanups, as we know there's code to follow the call. | |
e2ee9912 | 2427 | |
f725a3ec | 2428 | If rtx_equal_function_value_matters is false, that means we've |
e2ee9912 RH |
2429 | finished with regular parsing. Which means that some of the |
2430 | machinery we use to generate tail-calls is no longer in place. | |
2431 | This is most often true of sjlj-exceptions, which we couldn't | |
2432 | tail-call to anyway. */ | |
0a1c58a2 | 2433 | |
099e9712 JH |
2434 | if (currently_expanding_call++ != 0 |
2435 | || !flag_optimize_sibling_calls | |
2436 | || !rtx_equal_function_value_matters | |
099e9712 JH |
2437 | || any_pending_cleanups (1) |
2438 | || args_size.var) | |
2439 | try_tail_call = try_tail_recursion = 0; | |
2440 | ||
2441 | /* Tail recursion fails, when we are not dealing with recursive calls. */ | |
2442 | if (!try_tail_recursion | |
2443 | || TREE_CODE (TREE_OPERAND (exp, 0)) != ADDR_EXPR | |
2444 | || TREE_OPERAND (TREE_OPERAND (exp, 0), 0) != current_function_decl) | |
2445 | try_tail_recursion = 0; | |
2446 | ||
2447 | /* Rest of purposes for tail call optimizations to fail. */ | |
2448 | if ( | |
2449 | #ifdef HAVE_sibcall_epilogue | |
2450 | !HAVE_sibcall_epilogue | |
2451 | #else | |
2452 | 1 | |
2453 | #endif | |
2454 | || !try_tail_call | |
2455 | /* Doing sibling call optimization needs some work, since | |
2456 | structure_value_addr can be allocated on the stack. | |
2457 | It does not seem worth the effort since few optimizable | |
2458 | sibling calls will return a structure. */ | |
2459 | || structure_value_addr != NULL_RTX | |
2460 | /* If the register holding the address is a callee saved | |
2461 | register, then we lose. We have no way to prevent that, | |
2462 | so we only allow calls to named functions. */ | |
2463 | /* ??? This could be done by having the insn constraints | |
2464 | use a register class that is all call-clobbered. Any | |
2465 | reload insns generated to fix things up would appear | |
2466 | before the sibcall_epilogue. */ | |
2467 | || fndecl == NULL_TREE | |
2468 | || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP)) | |
9a1ba437 | 2469 | || TREE_THIS_VOLATILE (fndecl) |
099e9712 JH |
2470 | || !FUNCTION_OK_FOR_SIBCALL (fndecl) |
2471 | /* If this function requires more stack slots than the current | |
2472 | function, we cannot change it into a sibling call. */ | |
2473 | || args_size.constant > current_function_args_size | |
2474 | /* If the callee pops its own arguments, then it must pop exactly | |
2475 | the same number of arguments as the current function. */ | |
2476 | || RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) | |
2477 | != RETURN_POPS_ARGS (current_function_decl, | |
2478 | TREE_TYPE (current_function_decl), | |
2479 | current_function_args_size)) | |
497eb8c3 | 2480 | try_tail_call = 0; |
497eb8c3 | 2481 | |
099e9712 JH |
2482 | if (try_tail_call || try_tail_recursion) |
2483 | { | |
2484 | int end, inc; | |
2485 | actparms = NULL_TREE; | |
194c7c45 RH |
2486 | /* Ok, we're going to give the tail call the old college try. |
2487 | This means we're going to evaluate the function arguments | |
2488 | up to three times. There are two degrees of badness we can | |
2489 | encounter, those that can be unsaved and those that can't. | |
2490 | (See unsafe_for_reeval commentary for details.) | |
2491 | ||
2492 | Generate a new argument list. Pass safe arguments through | |
f725a3ec | 2493 | unchanged. For the easy badness wrap them in UNSAVE_EXPRs. |
194c7c45 | 2494 | For hard badness, evaluate them now and put their resulting |
099e9712 JH |
2495 | rtx in a temporary VAR_DECL. |
2496 | ||
2497 | initialize_argument_information has ordered the array for the | |
2498 | order to be pushed, and we must remember this when reconstructing | |
2499 | the original argument orde. */ | |
4d393a0b | 2500 | |
099e9712 JH |
2501 | if (PUSH_ARGS_REVERSED) |
2502 | { | |
2503 | inc = 1; | |
2504 | i = 0; | |
2505 | end = num_actuals; | |
2506 | } | |
2507 | else | |
f725a3ec | 2508 | { |
099e9712 JH |
2509 | inc = -1; |
2510 | i = num_actuals - 1; | |
2511 | end = -1; | |
2512 | } | |
2513 | ||
2514 | for (; i != end; i += inc) | |
2515 | { | |
2516 | switch (unsafe_for_reeval (args[i].tree_value)) | |
2517 | { | |
f725a3ec KH |
2518 | case 0: /* Safe. */ |
2519 | break; | |
497eb8c3 | 2520 | |
f725a3ec KH |
2521 | case 1: /* Mildly unsafe. */ |
2522 | args[i].tree_value = unsave_expr (args[i].tree_value); | |
2523 | break; | |
497eb8c3 | 2524 | |
f725a3ec KH |
2525 | case 2: /* Wildly unsafe. */ |
2526 | { | |
2527 | tree var = build_decl (VAR_DECL, NULL_TREE, | |
099e9712 | 2528 | TREE_TYPE (args[i].tree_value)); |
19e7881c MM |
2529 | SET_DECL_RTL (var, |
2530 | expand_expr (args[i].tree_value, NULL_RTX, | |
2531 | VOIDmode, EXPAND_NORMAL)); | |
099e9712 | 2532 | args[i].tree_value = var; |
f725a3ec KH |
2533 | } |
2534 | break; | |
0a1c58a2 | 2535 | |
f725a3ec KH |
2536 | default: |
2537 | abort (); | |
2538 | } | |
099e9712 JH |
2539 | /* We need to build actparms for optimize_tail_recursion. We can |
2540 | safely trash away TREE_PURPOSE, since it is unused by this | |
2541 | function. */ | |
2542 | if (try_tail_recursion) | |
2543 | actparms = tree_cons (NULL_TREE, args[i].tree_value, actparms); | |
2544 | } | |
194c7c45 RH |
2545 | /* Expanding one of those dangerous arguments could have added |
2546 | cleanups, but otherwise give it a whirl. */ | |
099e9712 JH |
2547 | if (any_pending_cleanups (1)) |
2548 | try_tail_call = try_tail_recursion = 0; | |
0a1c58a2 JL |
2549 | } |
2550 | ||
2551 | /* Generate a tail recursion sequence when calling ourselves. */ | |
2552 | ||
099e9712 | 2553 | if (try_tail_recursion) |
0a1c58a2 JL |
2554 | { |
2555 | /* We want to emit any pending stack adjustments before the tail | |
2556 | recursion "call". That way we know any adjustment after the tail | |
2557 | recursion call can be ignored if we indeed use the tail recursion | |
2558 | call expansion. */ | |
2559 | int save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2560 | int save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2561 | |
41c39533 RH |
2562 | /* Emit any queued insns now; otherwise they would end up in |
2563 | only one of the alternates. */ | |
2564 | emit_queue (); | |
2565 | ||
0a1c58a2 JL |
2566 | /* Use a new sequence to hold any RTL we generate. We do not even |
2567 | know if we will use this RTL yet. The final decision can not be | |
2568 | made until after RTL generation for the entire function is | |
2569 | complete. */ | |
b06775f9 | 2570 | start_sequence (); |
f5e846c8 MM |
2571 | /* If expanding any of the arguments creates cleanups, we can't |
2572 | do a tailcall. So, we'll need to pop the pending cleanups | |
2573 | list. If, however, all goes well, and there are no cleanups | |
2574 | then the call to expand_start_target_temps will have no | |
2575 | effect. */ | |
2576 | expand_start_target_temps (); | |
b06775f9 | 2577 | if (optimize_tail_recursion (actparms, get_last_insn ())) |
f5e846c8 MM |
2578 | { |
2579 | if (any_pending_cleanups (1)) | |
2580 | try_tail_call = try_tail_recursion = 0; | |
2581 | else | |
2582 | tail_recursion_insns = get_insns (); | |
2583 | } | |
2584 | expand_end_target_temps (); | |
0a1c58a2 JL |
2585 | end_sequence (); |
2586 | ||
0a1c58a2 JL |
2587 | /* Restore the original pending stack adjustment for the sibling and |
2588 | normal call cases below. */ | |
2589 | pending_stack_adjust = save_pending_stack_adjust; | |
1503a7ec | 2590 | stack_pointer_delta = save_stack_pointer_delta; |
0a1c58a2 JL |
2591 | } |
2592 | ||
099e9712 JH |
2593 | if (profile_arc_flag && (flags & ECF_FORK_OR_EXEC)) |
2594 | { | |
2595 | /* A fork duplicates the profile information, and an exec discards | |
2596 | it. We can't rely on fork/exec to be paired. So write out the | |
2597 | profile information we have gathered so far, and clear it. */ | |
2598 | /* ??? When Linux's __clone is called with CLONE_VM set, profiling | |
2599 | is subject to race conditions, just as with multithreaded | |
2600 | programs. */ | |
2601 | ||
9d98f8f9 JH |
2602 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__bb_fork_func"), |
2603 | LCT_ALWAYS_RETURN, | |
099e9712 JH |
2604 | VOIDmode, 0); |
2605 | } | |
0a1c58a2 | 2606 | |
c2f8b491 JH |
2607 | /* Ensure current function's preferred stack boundary is at least |
2608 | what we need. We don't have to increase alignment for recursive | |
2609 | functions. */ | |
2610 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2611 | && fndecl != current_function_decl) | |
2612 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
2613 | ||
099e9712 | 2614 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2615 | |
099e9712 | 2616 | function_call_count++; |
39842893 | 2617 | |
0a1c58a2 JL |
2618 | /* We want to make two insn chains; one for a sibling call, the other |
2619 | for a normal call. We will select one of the two chains after | |
2620 | initial RTL generation is complete. */ | |
2621 | for (pass = 0; pass < 2; pass++) | |
2622 | { | |
2623 | int sibcall_failure = 0; | |
2624 | /* We want to emit ay pending stack adjustments before the tail | |
2625 | recursion "call". That way we know any adjustment after the tail | |
2626 | recursion call can be ignored if we indeed use the tail recursion | |
2627 | call expansion. */ | |
5ac9118e KG |
2628 | int save_pending_stack_adjust = 0; |
2629 | int save_stack_pointer_delta = 0; | |
0a1c58a2 | 2630 | rtx insns; |
7d167afd | 2631 | rtx before_call, next_arg_reg; |
39842893 | 2632 | |
0a1c58a2 JL |
2633 | if (pass == 0) |
2634 | { | |
099e9712 | 2635 | if (! try_tail_call) |
0a1c58a2 | 2636 | continue; |
51bbfa0c | 2637 | |
1c81f9fe JM |
2638 | /* Emit any queued insns now; otherwise they would end up in |
2639 | only one of the alternates. */ | |
2640 | emit_queue (); | |
2641 | ||
0a1c58a2 JL |
2642 | /* State variables we need to save and restore between |
2643 | iterations. */ | |
2644 | save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2645 | save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2646 | } |
f2d33f13 JH |
2647 | if (pass) |
2648 | flags &= ~ECF_SIBCALL; | |
2649 | else | |
2650 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2651 | |
0a1c58a2 | 2652 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2653 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2654 | argblock = 0; |
2655 | call_fusage = 0; | |
fa76d9e0 | 2656 | |
f725a3ec | 2657 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2658 | |
0a1c58a2 JL |
2659 | From this point on, if the sibling call fails, we want to set |
2660 | sibcall_failure instead of continuing the loop. */ | |
2661 | start_sequence (); | |
eecb6f50 | 2662 | |
b8d254e6 JJ |
2663 | if (pass == 0) |
2664 | { | |
2665 | /* We know at this point that there are not currently any | |
2666 | pending cleanups. If, however, in the process of evaluating | |
2667 | the arguments we were to create some, we'll need to be | |
2668 | able to get rid of them. */ | |
2669 | expand_start_target_temps (); | |
2670 | } | |
2671 | ||
0a1c58a2 JL |
2672 | /* Don't let pending stack adjusts add up to too much. |
2673 | Also, do all pending adjustments now if there is any chance | |
2674 | this might be a call to alloca or if we are expanding a sibling | |
2675 | call sequence. */ | |
2676 | if (pending_stack_adjust >= 32 | |
f2d33f13 | 2677 | || (pending_stack_adjust > 0 && (flags & ECF_MAY_BE_ALLOCA)) |
0a1c58a2 JL |
2678 | || pass == 0) |
2679 | do_pending_stack_adjust (); | |
51bbfa0c | 2680 | |
54fef245 RH |
2681 | /* When calling a const function, we must pop the stack args right away, |
2682 | so that the pop is deleted or moved with the call. */ | |
2683 | if (flags & (ECF_CONST | ECF_PURE)) | |
2684 | NO_DEFER_POP; | |
2685 | ||
0a1c58a2 JL |
2686 | /* Push the temporary stack slot level so that we can free any |
2687 | temporaries we make. */ | |
2688 | push_temp_slots (); | |
51bbfa0c | 2689 | |
6f90e075 | 2690 | #ifdef FINAL_REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2691 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, |
2692 | args_size.var); | |
6f90e075 | 2693 | #endif |
0a1c58a2 | 2694 | /* Precompute any arguments as needed. */ |
f8a097cd JH |
2695 | if (pass) |
2696 | precompute_arguments (flags, num_actuals, args); | |
51bbfa0c | 2697 | |
0a1c58a2 JL |
2698 | /* Now we are about to start emitting insns that can be deleted |
2699 | if a libcall is deleted. */ | |
2a8f6b90 | 2700 | if (flags & (ECF_CONST | ECF_PURE | ECF_MALLOC)) |
0a1c58a2 | 2701 | start_sequence (); |
51bbfa0c | 2702 | |
099e9712 | 2703 | adjusted_args_size = args_size; |
ce48579b RH |
2704 | /* Compute the actual size of the argument block required. The variable |
2705 | and constant sizes must be combined, the size may have to be rounded, | |
2706 | and there may be a minimum required size. When generating a sibcall | |
2707 | pattern, do not round up, since we'll be re-using whatever space our | |
2708 | caller provided. */ | |
2709 | unadjusted_args_size | |
f725a3ec KH |
2710 | = compute_argument_block_size (reg_parm_stack_space, |
2711 | &adjusted_args_size, | |
ce48579b RH |
2712 | (pass == 0 ? 0 |
2713 | : preferred_stack_boundary)); | |
2714 | ||
f725a3ec | 2715 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2716 | |
f8a097cd JH |
2717 | /* The argument block when performing a sibling call is the |
2718 | incoming argument block. */ | |
2719 | if (pass == 0) | |
c67846f2 JJ |
2720 | { |
2721 | argblock = virtual_incoming_args_rtx; | |
2722 | stored_args_map = sbitmap_alloc (args_size.constant); | |
2723 | sbitmap_zero (stored_args_map); | |
2724 | } | |
ce48579b | 2725 | |
0a1c58a2 JL |
2726 | /* If we have no actual push instructions, or shouldn't use them, |
2727 | make space for all args right now. */ | |
099e9712 | 2728 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2729 | { |
0a1c58a2 JL |
2730 | if (old_stack_level == 0) |
2731 | { | |
2732 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
2733 | old_pending_adj = pending_stack_adjust; | |
2734 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2735 | /* stack_arg_under_construction says whether a stack arg is |
2736 | being constructed at the old stack level. Pushing the stack | |
2737 | gets a clean outgoing argument block. */ | |
2738 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2739 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2740 | } |
099e9712 | 2741 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
51bbfa0c | 2742 | } |
0a1c58a2 JL |
2743 | else |
2744 | { | |
2745 | /* Note that we must go through the motions of allocating an argument | |
2746 | block even if the size is zero because we may be storing args | |
2747 | in the area reserved for register arguments, which may be part of | |
2748 | the stack frame. */ | |
26a258fe | 2749 | |
099e9712 | 2750 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2751 | |
0a1c58a2 JL |
2752 | /* Store the maximum argument space used. It will be pushed by |
2753 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2754 | checking). */ | |
51bbfa0c | 2755 | |
0a1c58a2 JL |
2756 | if (needed > current_function_outgoing_args_size) |
2757 | current_function_outgoing_args_size = needed; | |
51bbfa0c | 2758 | |
0a1c58a2 JL |
2759 | if (must_preallocate) |
2760 | { | |
f73ad30e JH |
2761 | if (ACCUMULATE_OUTGOING_ARGS) |
2762 | { | |
f8a097cd JH |
2763 | /* Since the stack pointer will never be pushed, it is |
2764 | possible for the evaluation of a parm to clobber | |
2765 | something we have already written to the stack. | |
2766 | Since most function calls on RISC machines do not use | |
2767 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2768 | |
f73ad30e | 2769 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2770 | written and that we are using. Here we set up to do this |
2771 | by making a new stack usage map from the old one. The | |
f725a3ec | 2772 | actual save will be done by store_one_arg. |
26a258fe | 2773 | |
f73ad30e JH |
2774 | Another approach might be to try to reorder the argument |
2775 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2776 | |
e5e809f4 | 2777 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
f8a097cd JH |
2778 | /* Since we will be writing into the entire argument area, |
2779 | the map must be allocated for its entire size, not just | |
2780 | the part that is the responsibility of the caller. */ | |
f73ad30e | 2781 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2782 | #endif |
2783 | ||
2784 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2785 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2786 | needed + 1); | |
51bbfa0c | 2787 | #else |
f73ad30e JH |
2788 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2789 | needed); | |
51bbfa0c | 2790 | #endif |
f8a097cd JH |
2791 | stack_usage_map |
2792 | = (char *) alloca (highest_outgoing_arg_in_use); | |
51bbfa0c | 2793 | |
f73ad30e | 2794 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2795 | memcpy (stack_usage_map, initial_stack_usage_map, |
2796 | initial_highest_arg_in_use); | |
2f4aa534 | 2797 | |
f73ad30e | 2798 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2799 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2800 | (highest_outgoing_arg_in_use |
2801 | - initial_highest_arg_in_use)); | |
2802 | needed = 0; | |
2f4aa534 | 2803 | |
f8a097cd JH |
2804 | /* The address of the outgoing argument list must not be |
2805 | copied to a register here, because argblock would be left | |
2806 | pointing to the wrong place after the call to | |
f725a3ec | 2807 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2808 | |
f73ad30e | 2809 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2810 | } |
f73ad30e | 2811 | else |
26a258fe | 2812 | { |
f73ad30e | 2813 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2814 | { |
f73ad30e | 2815 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2816 | to get this space. */ |
2817 | needed | |
f725a3ec | 2818 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2819 | (unadjusted_args_size, |
099e9712 | 2820 | &adjusted_args_size, |
ce48579b RH |
2821 | preferred_unit_stack_boundary)); |
2822 | ||
2823 | /* combine_pending_stack_adjustment_and_call computes | |
2824 | an adjustment before the arguments are allocated. | |
2825 | Account for them and see whether or not the stack | |
2826 | needs to go up or down. */ | |
2827 | needed = unadjusted_args_size - needed; | |
2828 | ||
2829 | if (needed < 0) | |
f73ad30e | 2830 | { |
ce48579b RH |
2831 | /* We're releasing stack space. */ |
2832 | /* ??? We can avoid any adjustment at all if we're | |
2833 | already aligned. FIXME. */ | |
2834 | pending_stack_adjust = -needed; | |
2835 | do_pending_stack_adjust (); | |
f73ad30e JH |
2836 | needed = 0; |
2837 | } | |
f725a3ec | 2838 | else |
ce48579b RH |
2839 | /* We need to allocate space. We'll do that in |
2840 | push_block below. */ | |
2841 | pending_stack_adjust = 0; | |
0a1c58a2 | 2842 | } |
ce48579b RH |
2843 | |
2844 | /* Special case this because overhead of `push_block' in | |
2845 | this case is non-trivial. */ | |
f73ad30e JH |
2846 | if (needed == 0) |
2847 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2848 | else |
f73ad30e JH |
2849 | argblock = push_block (GEN_INT (needed), 0, 0); |
2850 | ||
f8a097cd JH |
2851 | /* We only really need to call `copy_to_reg' in the case |
2852 | where push insns are going to be used to pass ARGBLOCK | |
2853 | to a function call in ARGS. In that case, the stack | |
2854 | pointer changes value from the allocation point to the | |
2855 | call point, and hence the value of | |
2856 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2857 | as well always do it. */ | |
f73ad30e | 2858 | argblock = copy_to_reg (argblock); |
0a1c58a2 | 2859 | |
f8a097cd | 2860 | /* The save/restore code in store_one_arg handles all |
ce48579b RH |
2861 | cases except one: a constructor call (including a C |
2862 | function returning a BLKmode struct) to initialize | |
2863 | an argument. */ | |
f8a097cd JH |
2864 | if (stack_arg_under_construction) |
2865 | { | |
e5e809f4 | 2866 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
ce48579b | 2867 | rtx push_size = GEN_INT (reg_parm_stack_space |
099e9712 | 2868 | + adjusted_args_size.constant); |
bfbf933a | 2869 | #else |
099e9712 | 2870 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
bfbf933a | 2871 | #endif |
f8a097cd JH |
2872 | if (old_stack_level == 0) |
2873 | { | |
ce48579b RH |
2874 | emit_stack_save (SAVE_BLOCK, &old_stack_level, |
2875 | NULL_RTX); | |
f8a097cd JH |
2876 | old_pending_adj = pending_stack_adjust; |
2877 | pending_stack_adjust = 0; | |
ce48579b RH |
2878 | /* stack_arg_under_construction says whether a stack |
2879 | arg is being constructed at the old stack level. | |
2880 | Pushing the stack gets a clean outgoing argument | |
2881 | block. */ | |
2882 | old_stack_arg_under_construction | |
2883 | = stack_arg_under_construction; | |
f8a097cd JH |
2884 | stack_arg_under_construction = 0; |
2885 | /* Make a new map for the new argument list. */ | |
ce48579b RH |
2886 | stack_usage_map = (char *) |
2887 | alloca (highest_outgoing_arg_in_use); | |
961192e1 | 2888 | memset (stack_usage_map, 0, highest_outgoing_arg_in_use); |
f8a097cd JH |
2889 | highest_outgoing_arg_in_use = 0; |
2890 | } | |
ce48579b RH |
2891 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2892 | BITS_PER_UNIT); | |
f8a097cd | 2893 | } |
ce48579b RH |
2894 | /* If argument evaluation might modify the stack pointer, |
2895 | copy the address of the argument list to a register. */ | |
f8a097cd JH |
2896 | for (i = 0; i < num_actuals; i++) |
2897 | if (args[i].pass_on_stack) | |
2898 | { | |
2899 | argblock = copy_addr_to_reg (argblock); | |
2900 | break; | |
2901 | } | |
f73ad30e | 2902 | } |
0a1c58a2 | 2903 | } |
bfbf933a | 2904 | } |
bfbf933a | 2905 | |
0a1c58a2 | 2906 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2907 | |
c795bca9 | 2908 | #ifdef PREFERRED_STACK_BOUNDARY |
0a1c58a2 JL |
2909 | /* If we push args individually in reverse order, perform stack alignment |
2910 | before the first push (the last arg). */ | |
f73ad30e | 2911 | if (PUSH_ARGS_REVERSED && argblock == 0 |
099e9712 | 2912 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2913 | { |
0a1c58a2 JL |
2914 | /* When the stack adjustment is pending, we get better code |
2915 | by combining the adjustments. */ | |
f725a3ec | 2916 | if (pending_stack_adjust |
739fb049 | 2917 | && ! (flags & (ECF_CONST | ECF_PURE)) |
0a1c58a2 | 2918 | && ! inhibit_defer_pop) |
ce48579b RH |
2919 | { |
2920 | pending_stack_adjust | |
f725a3ec | 2921 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2922 | (unadjusted_args_size, |
099e9712 | 2923 | &adjusted_args_size, |
ce48579b RH |
2924 | preferred_unit_stack_boundary)); |
2925 | do_pending_stack_adjust (); | |
2926 | } | |
0a1c58a2 | 2927 | else if (argblock == 0) |
099e9712 | 2928 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2929 | - unadjusted_args_size)); |
0a1c58a2 | 2930 | } |
ebcd0b57 JH |
2931 | /* Now that the stack is properly aligned, pops can't safely |
2932 | be deferred during the evaluation of the arguments. */ | |
2933 | NO_DEFER_POP; | |
51bbfa0c RS |
2934 | #endif |
2935 | ||
0a1c58a2 JL |
2936 | /* Don't try to defer pops if preallocating, not even from the first arg, |
2937 | since ARGBLOCK probably refers to the SP. */ | |
2938 | if (argblock) | |
2939 | NO_DEFER_POP; | |
51bbfa0c | 2940 | |
0a1c58a2 | 2941 | funexp = rtx_for_function_call (fndecl, exp); |
51bbfa0c | 2942 | |
0a1c58a2 JL |
2943 | /* Figure out the register where the value, if any, will come back. */ |
2944 | valreg = 0; | |
2945 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2946 | && ! structure_value_addr) | |
2947 | { | |
2948 | if (pcc_struct_value) | |
2949 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
7d167afd | 2950 | fndecl, (pass == 0)); |
0a1c58a2 | 2951 | else |
7d167afd | 2952 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0)); |
0a1c58a2 | 2953 | } |
51bbfa0c | 2954 | |
0a1c58a2 JL |
2955 | /* Precompute all register parameters. It isn't safe to compute anything |
2956 | once we have started filling any specific hard regs. */ | |
2957 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 2958 | |
f73ad30e | 2959 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2960 | /* Save the fixed argument area if it's part of the caller's frame and |
2961 | is clobbered by argument setup for this call. */ | |
f8a097cd | 2962 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
2963 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2964 | &low_to_save, &high_to_save); | |
b94301c2 | 2965 | #endif |
51bbfa0c | 2966 | |
0a1c58a2 JL |
2967 | /* Now store (and compute if necessary) all non-register parms. |
2968 | These come before register parms, since they can require block-moves, | |
2969 | which could clobber the registers used for register parms. | |
2970 | Parms which have partial registers are not stored here, | |
2971 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 2972 | |
0a1c58a2 JL |
2973 | for (i = 0; i < num_actuals; i++) |
2974 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
c67846f2 JJ |
2975 | { |
2976 | rtx before_arg = get_last_insn (); | |
2977 | ||
4c6b3b2a JJ |
2978 | if (store_one_arg (&args[i], argblock, flags, |
2979 | adjusted_args_size.var != 0, | |
2980 | reg_parm_stack_space) | |
2981 | || (pass == 0 | |
2982 | && check_sibcall_argument_overlap (before_arg, | |
2983 | &args[i]))) | |
c67846f2 JJ |
2984 | sibcall_failure = 1; |
2985 | } | |
0a1c58a2 JL |
2986 | |
2987 | /* If we have a parm that is passed in registers but not in memory | |
2988 | and whose alignment does not permit a direct copy into registers, | |
2989 | make a group of pseudos that correspond to each register that we | |
2990 | will later fill. */ | |
2991 | if (STRICT_ALIGNMENT) | |
2992 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2993 | ||
2994 | /* Now store any partially-in-registers parm. | |
2995 | This is the last place a block-move can happen. */ | |
2996 | if (reg_parm_seen) | |
2997 | for (i = 0; i < num_actuals; i++) | |
2998 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 JJ |
2999 | { |
3000 | rtx before_arg = get_last_insn (); | |
3001 | ||
4c6b3b2a JJ |
3002 | if (store_one_arg (&args[i], argblock, flags, |
3003 | adjusted_args_size.var != 0, | |
3004 | reg_parm_stack_space) | |
3005 | || (pass == 0 | |
3006 | && check_sibcall_argument_overlap (before_arg, | |
3007 | &args[i]))) | |
c67846f2 JJ |
3008 | sibcall_failure = 1; |
3009 | } | |
51bbfa0c | 3010 | |
c795bca9 | 3011 | #ifdef PREFERRED_STACK_BOUNDARY |
0a1c58a2 JL |
3012 | /* If we pushed args in forward order, perform stack alignment |
3013 | after pushing the last arg. */ | |
f73ad30e | 3014 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
099e9712 | 3015 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 3016 | - unadjusted_args_size)); |
51bbfa0c RS |
3017 | #endif |
3018 | ||
0a1c58a2 JL |
3019 | /* If register arguments require space on the stack and stack space |
3020 | was not preallocated, allocate stack space here for arguments | |
3021 | passed in registers. */ | |
f73ad30e JH |
3022 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
3023 | if (!ACCUMULATE_OUTGOING_ARGS | |
f725a3ec | 3024 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 3025 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
3026 | #endif |
3027 | ||
0a1c58a2 JL |
3028 | /* Pass the function the address in which to return a |
3029 | structure value. */ | |
3030 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
3031 | { | |
3032 | emit_move_insn (struct_value_rtx, | |
3033 | force_reg (Pmode, | |
3034 | force_operand (structure_value_addr, | |
3035 | NULL_RTX))); | |
3036 | ||
3037 | /* Mark the memory for the aggregate as write-only. */ | |
3038 | if (current_function_check_memory_usage) | |
ebb1b59a | 3039 | emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK, |
0a1c58a2 | 3040 | VOIDmode, 3, |
f725a3ec | 3041 | structure_value_addr, ptr_mode, |
0a1c58a2 JL |
3042 | GEN_INT (struct_value_size), |
3043 | TYPE_MODE (sizetype), | |
3044 | GEN_INT (MEMORY_USE_WO), | |
3045 | TYPE_MODE (integer_type_node)); | |
3046 | ||
3047 | if (GET_CODE (struct_value_rtx) == REG) | |
3048 | use_reg (&call_fusage, struct_value_rtx); | |
3049 | } | |
c2939b57 | 3050 | |
0a1c58a2 | 3051 | funexp = prepare_call_address (funexp, fndecl, &call_fusage, |
3affaf29 | 3052 | reg_parm_seen, pass == 0); |
51bbfa0c | 3053 | |
099e9712 | 3054 | load_register_parameters (args, num_actuals, &call_fusage, flags); |
f725a3ec | 3055 | |
0a1c58a2 JL |
3056 | /* Perform postincrements before actually calling the function. */ |
3057 | emit_queue (); | |
51bbfa0c | 3058 | |
0a1c58a2 JL |
3059 | /* Save a pointer to the last insn before the call, so that we can |
3060 | later safely search backwards to find the CALL_INSN. */ | |
3061 | before_call = get_last_insn (); | |
51bbfa0c | 3062 | |
7d167afd JJ |
3063 | /* Set up next argument register. For sibling calls on machines |
3064 | with register windows this should be the incoming register. */ | |
3065 | #ifdef FUNCTION_INCOMING_ARG | |
3066 | if (pass == 0) | |
3067 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
3068 | void_type_node, 1); | |
3069 | else | |
3070 | #endif | |
3071 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
3072 | void_type_node, 1); | |
3073 | ||
0a1c58a2 JL |
3074 | /* All arguments and registers used for the call must be set up by |
3075 | now! */ | |
3076 | ||
ebcd0b57 | 3077 | #ifdef PREFERRED_STACK_BOUNDARY |
ce48579b RH |
3078 | /* Stack must be properly aligned now. */ |
3079 | if (pass && stack_pointer_delta % preferred_unit_stack_boundary) | |
d9a7d592 | 3080 | abort (); |
ebcd0b57 JH |
3081 | #endif |
3082 | ||
0a1c58a2 JL |
3083 | /* Generate the actual call instruction. */ |
3084 | emit_call_1 (funexp, fndecl, funtype, unadjusted_args_size, | |
099e9712 | 3085 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 3086 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
f2d33f13 | 3087 | flags); |
0a1c58a2 | 3088 | |
1503a7ec JH |
3089 | /* Verify that we've deallocated all the stack we used. */ |
3090 | if (pass | |
f725a3ec KH |
3091 | && old_stack_allocated != stack_pointer_delta - pending_stack_adjust) |
3092 | abort (); | |
1503a7ec | 3093 | |
0a1c58a2 JL |
3094 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
3095 | Test valreg so we don't crash; may safely ignore `const' | |
3096 | if return type is void. Disable for PARALLEL return values, because | |
3097 | we have no way to move such values into a pseudo register. */ | |
8be9eb00 RH |
3098 | if (pass |
3099 | && (flags & (ECF_CONST | ECF_PURE)) | |
2a8f6b90 | 3100 | && valreg != 0 && GET_CODE (valreg) != PARALLEL) |
9ae8ffe7 | 3101 | { |
0a1c58a2 JL |
3102 | rtx note = 0; |
3103 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3104 | rtx insns; | |
9ae8ffe7 | 3105 | |
0a1c58a2 JL |
3106 | /* Mark the return value as a pointer if needed. */ |
3107 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
bdb429a5 | 3108 | mark_reg_pointer (temp, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); |
0a1c58a2 JL |
3109 | |
3110 | /* Construct an "equal form" for the value which mentions all the | |
3111 | arguments in order as well as the function name. */ | |
5591ee6f JH |
3112 | for (i = 0; i < num_actuals; i++) |
3113 | note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note); | |
0a1c58a2 | 3114 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); |
9ae8ffe7 | 3115 | |
0a1c58a2 JL |
3116 | insns = get_insns (); |
3117 | end_sequence (); | |
9ae8ffe7 | 3118 | |
2a8f6b90 JH |
3119 | if (flags & ECF_PURE) |
3120 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3121 | gen_rtx_USE (VOIDmode, | |
3122 | gen_rtx_MEM (BLKmode, | |
3123 | gen_rtx_SCRATCH (VOIDmode))), note); | |
3124 | ||
0a1c58a2 | 3125 | emit_libcall_block (insns, temp, valreg, note); |
f725a3ec | 3126 | |
0a1c58a2 JL |
3127 | valreg = temp; |
3128 | } | |
2a8f6b90 | 3129 | else if (flags & (ECF_CONST | ECF_PURE)) |
0a1c58a2 JL |
3130 | { |
3131 | /* Otherwise, just write out the sequence without a note. */ | |
3132 | rtx insns = get_insns (); | |
9ae8ffe7 | 3133 | |
0a1c58a2 JL |
3134 | end_sequence (); |
3135 | emit_insns (insns); | |
3136 | } | |
f2d33f13 | 3137 | else if (flags & ECF_MALLOC) |
0a1c58a2 JL |
3138 | { |
3139 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3140 | rtx last, insns; | |
3141 | ||
f725a3ec | 3142 | /* The return value from a malloc-like function is a pointer. */ |
0a1c58a2 | 3143 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
bdb429a5 | 3144 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
0a1c58a2 JL |
3145 | |
3146 | emit_move_insn (temp, valreg); | |
3147 | ||
3148 | /* The return value from a malloc-like function can not alias | |
3149 | anything else. */ | |
3150 | last = get_last_insn (); | |
f725a3ec | 3151 | REG_NOTES (last) = |
0a1c58a2 JL |
3152 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); |
3153 | ||
3154 | /* Write out the sequence. */ | |
3155 | insns = get_insns (); | |
3156 | end_sequence (); | |
3157 | emit_insns (insns); | |
3158 | valreg = temp; | |
3159 | } | |
51bbfa0c | 3160 | |
0a1c58a2 JL |
3161 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3162 | if nonvolatile values are live. For functions that cannot return, | |
3163 | inform flow that control does not fall through. */ | |
51bbfa0c | 3164 | |
570a98eb | 3165 | if ((flags & (ECF_NORETURN | ECF_LONGJMP)) || pass == 0) |
c2939b57 | 3166 | { |
570a98eb | 3167 | /* The barrier must be emitted |
0a1c58a2 JL |
3168 | immediately after the CALL_INSN. Some ports emit more |
3169 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 3170 | |
0a1c58a2 JL |
3171 | rtx last = get_last_insn (); |
3172 | while (GET_CODE (last) != CALL_INSN) | |
3173 | { | |
3174 | last = PREV_INSN (last); | |
3175 | /* There was no CALL_INSN? */ | |
3176 | if (last == before_call) | |
3177 | abort (); | |
3178 | } | |
51bbfa0c | 3179 | |
570a98eb | 3180 | emit_barrier_after (last); |
0a1c58a2 | 3181 | } |
51bbfa0c | 3182 | |
f2d33f13 | 3183 | if (flags & ECF_LONGJMP) |
099e9712 | 3184 | current_function_calls_longjmp = 1; |
51bbfa0c | 3185 | |
25a1fcb4 RK |
3186 | /* If this function is returning into a memory location marked as |
3187 | readonly, it means it is initializing that location. But we normally | |
3188 | treat functions as not clobbering such locations, so we need to | |
3189 | specify that this one does. */ | |
3190 | if (target != 0 && GET_CODE (target) == MEM | |
3191 | && structure_value_addr != 0 && RTX_UNCHANGING_P (target)) | |
3192 | emit_insn (gen_rtx_CLOBBER (VOIDmode, target)); | |
3193 | ||
0a1c58a2 | 3194 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 3195 | |
0a1c58a2 JL |
3196 | /* If there are cleanups to be called, don't use a hard reg as target. |
3197 | We need to double check this and see if it matters anymore. */ | |
194c7c45 RH |
3198 | if (any_pending_cleanups (1)) |
3199 | { | |
3200 | if (target && REG_P (target) | |
3201 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
3202 | target = 0; | |
3203 | sibcall_failure = 1; | |
3204 | } | |
51bbfa0c | 3205 | |
0a1c58a2 JL |
3206 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
3207 | || ignore) | |
29008b51 | 3208 | { |
0a1c58a2 | 3209 | target = const0_rtx; |
29008b51 | 3210 | } |
0a1c58a2 JL |
3211 | else if (structure_value_addr) |
3212 | { | |
3213 | if (target == 0 || GET_CODE (target) != MEM) | |
3214 | { | |
3bdf5ad1 RK |
3215 | target |
3216 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3217 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
3218 | structure_value_addr)); | |
3219 | set_mem_attributes (target, exp, 1); | |
0a1c58a2 JL |
3220 | } |
3221 | } | |
3222 | else if (pcc_struct_value) | |
cacbd532 | 3223 | { |
0a1c58a2 JL |
3224 | /* This is the special C++ case where we need to |
3225 | know what the true target was. We take care to | |
3226 | never use this value more than once in one expression. */ | |
3227 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3228 | copy_to_reg (valreg)); | |
3bdf5ad1 | 3229 | set_mem_attributes (target, exp, 1); |
cacbd532 | 3230 | } |
0a1c58a2 JL |
3231 | /* Handle calls that return values in multiple non-contiguous locations. |
3232 | The Irix 6 ABI has examples of this. */ | |
3233 | else if (GET_CODE (valreg) == PARALLEL) | |
3234 | { | |
0a1c58a2 JL |
3235 | if (target == 0) |
3236 | { | |
1da68f56 RK |
3237 | /* This will only be assigned once, so it can be readonly. */ |
3238 | tree nt = build_qualified_type (TREE_TYPE (exp), | |
3239 | (TYPE_QUALS (TREE_TYPE (exp)) | |
3240 | | TYPE_QUAL_CONST)); | |
3241 | ||
3242 | target = assign_temp (nt, 0, 1, 1); | |
0a1c58a2 JL |
3243 | preserve_temp_slots (target); |
3244 | } | |
3245 | ||
3246 | if (! rtx_equal_p (target, valreg)) | |
1da68f56 RK |
3247 | emit_group_store (target, valreg, |
3248 | int_size_in_bytes (TREE_TYPE (exp)), | |
19caa751 RK |
3249 | TYPE_ALIGN (TREE_TYPE (exp))); |
3250 | ||
0a1c58a2 JL |
3251 | /* We can not support sibling calls for this case. */ |
3252 | sibcall_failure = 1; | |
3253 | } | |
3254 | else if (target | |
3255 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
3256 | && GET_MODE (target) == GET_MODE (valreg)) | |
3257 | { | |
3258 | /* TARGET and VALREG cannot be equal at this point because the | |
3259 | latter would not have REG_FUNCTION_VALUE_P true, while the | |
3260 | former would if it were referring to the same register. | |
3261 | ||
3262 | If they refer to the same register, this move will be a no-op, | |
3263 | except when function inlining is being done. */ | |
3264 | emit_move_insn (target, valreg); | |
3265 | } | |
3266 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
8eb99146 RH |
3267 | { |
3268 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3269 | ||
3270 | /* We can not support sibling calls for this case. */ | |
3271 | sibcall_failure = 1; | |
3272 | } | |
0a1c58a2 JL |
3273 | else |
3274 | target = copy_to_reg (valreg); | |
51bbfa0c | 3275 | |
84b55618 | 3276 | #ifdef PROMOTE_FUNCTION_RETURN |
0a1c58a2 JL |
3277 | /* If we promoted this return value, make the proper SUBREG. TARGET |
3278 | might be const0_rtx here, so be careful. */ | |
3279 | if (GET_CODE (target) == REG | |
3280 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3281 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3282 | { | |
3283 | tree type = TREE_TYPE (exp); | |
3284 | int unsignedp = TREE_UNSIGNED (type); | |
ddef6bc7 | 3285 | int offset = 0; |
84b55618 | 3286 | |
0a1c58a2 JL |
3287 | /* If we don't promote as expected, something is wrong. */ |
3288 | if (GET_MODE (target) | |
3289 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
3290 | abort (); | |
5d2ac65e | 3291 | |
ddef6bc7 JJ |
3292 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) |
3293 | && GET_MODE_SIZE (GET_MODE (target)) | |
3294 | > GET_MODE_SIZE (TYPE_MODE (type))) | |
3295 | { | |
3296 | offset = GET_MODE_SIZE (GET_MODE (target)) | |
3297 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3298 | if (! BYTES_BIG_ENDIAN) | |
3299 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3300 | else if (! WORDS_BIG_ENDIAN) | |
3301 | offset %= UNITS_PER_WORD; | |
3302 | } | |
3303 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
0a1c58a2 JL |
3304 | SUBREG_PROMOTED_VAR_P (target) = 1; |
3305 | SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; | |
3306 | } | |
84b55618 RK |
3307 | #endif |
3308 | ||
0a1c58a2 JL |
3309 | /* If size of args is variable or this was a constructor call for a stack |
3310 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3311 | |
7393c642 | 3312 | if (old_stack_level && ! (flags & ECF_SP_DEPRESSED)) |
0a1c58a2 JL |
3313 | { |
3314 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
3315 | pending_stack_adjust = old_pending_adj; | |
0a1c58a2 JL |
3316 | stack_arg_under_construction = old_stack_arg_under_construction; |
3317 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3318 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3319 | sibcall_failure = 1; |
3320 | } | |
f8a097cd | 3321 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3322 | { |
51bbfa0c | 3323 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
3324 | if (save_area) |
3325 | { | |
3326 | restore_fixed_argument_area (save_area, argblock, | |
3327 | high_to_save, low_to_save); | |
0a1c58a2 | 3328 | } |
b94301c2 | 3329 | #endif |
51bbfa0c | 3330 | |
0a1c58a2 JL |
3331 | /* If we saved any argument areas, restore them. */ |
3332 | for (i = 0; i < num_actuals; i++) | |
3333 | if (args[i].save_area) | |
3334 | { | |
3335 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3336 | rtx stack_area | |
3337 | = gen_rtx_MEM (save_mode, | |
3338 | memory_address (save_mode, | |
3339 | XEXP (args[i].stack_slot, 0))); | |
3340 | ||
3341 | if (save_mode != BLKmode) | |
3342 | emit_move_insn (stack_area, args[i].save_area); | |
3343 | else | |
3344 | emit_block_move (stack_area, | |
3345 | validize_mem (args[i].save_area), | |
3346 | GEN_INT (args[i].size.constant), | |
19caa751 | 3347 | PARM_BOUNDARY); |
0a1c58a2 | 3348 | } |
51bbfa0c | 3349 | |
0a1c58a2 JL |
3350 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3351 | stack_usage_map = initial_stack_usage_map; | |
3352 | } | |
51bbfa0c | 3353 | |
f725a3ec | 3354 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3355 | Check for the handler slots since we might not have a save area |
3356 | for non-local gotos. */ | |
59257ff7 | 3357 | |
f2d33f13 | 3358 | if ((flags & ECF_MAY_BE_ALLOCA) && nonlocal_goto_handler_slots != 0) |
0a1c58a2 | 3359 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
51bbfa0c | 3360 | |
0a1c58a2 JL |
3361 | pop_temp_slots (); |
3362 | ||
3363 | /* Free up storage we no longer need. */ | |
3364 | for (i = 0; i < num_actuals; ++i) | |
3365 | if (args[i].aligned_regs) | |
3366 | free (args[i].aligned_regs); | |
3367 | ||
e245d3af RH |
3368 | if (pass == 0) |
3369 | { | |
3370 | /* Undo the fake expand_start_target_temps we did earlier. If | |
3371 | there had been any cleanups created, we've already set | |
3372 | sibcall_failure. */ | |
3373 | expand_end_target_temps (); | |
3374 | } | |
3375 | ||
0a1c58a2 JL |
3376 | insns = get_insns (); |
3377 | end_sequence (); | |
3378 | ||
3379 | if (pass == 0) | |
3380 | { | |
3381 | tail_call_insns = insns; | |
3382 | ||
0a1c58a2 JL |
3383 | /* Restore the pending stack adjustment now that we have |
3384 | finished generating the sibling call sequence. */ | |
1503a7ec | 3385 | |
0a1c58a2 | 3386 | pending_stack_adjust = save_pending_stack_adjust; |
1503a7ec | 3387 | stack_pointer_delta = save_stack_pointer_delta; |
099e9712 JH |
3388 | |
3389 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3390 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3391 | { |
3392 | args[i].value = 0; | |
3393 | args[i].aligned_regs = 0; | |
3394 | args[i].stack = 0; | |
3395 | } | |
c67846f2 JJ |
3396 | |
3397 | sbitmap_free (stored_args_map); | |
0a1c58a2 JL |
3398 | } |
3399 | else | |
3400 | normal_call_insns = insns; | |
fadb729c JJ |
3401 | |
3402 | /* If something prevents making this a sibling call, | |
3403 | zero out the sequence. */ | |
3404 | if (sibcall_failure) | |
3405 | tail_call_insns = NULL_RTX; | |
0a1c58a2 JL |
3406 | } |
3407 | ||
3408 | /* The function optimize_sibling_and_tail_recursive_calls doesn't | |
3409 | handle CALL_PLACEHOLDERs inside other CALL_PLACEHOLDERs. This | |
3410 | can happen if the arguments to this function call an inline | |
3411 | function who's expansion contains another CALL_PLACEHOLDER. | |
3412 | ||
3413 | If there are any C_Ps in any of these sequences, replace them | |
f725a3ec | 3414 | with their normal call. */ |
0a1c58a2 JL |
3415 | |
3416 | for (insn = normal_call_insns; insn; insn = NEXT_INSN (insn)) | |
3417 | if (GET_CODE (insn) == CALL_INSN | |
3418 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3419 | replace_call_placeholder (insn, sibcall_use_normal); | |
3420 | ||
3421 | for (insn = tail_call_insns; insn; insn = NEXT_INSN (insn)) | |
3422 | if (GET_CODE (insn) == CALL_INSN | |
3423 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3424 | replace_call_placeholder (insn, sibcall_use_normal); | |
3425 | ||
3426 | for (insn = tail_recursion_insns; insn; insn = NEXT_INSN (insn)) | |
3427 | if (GET_CODE (insn) == CALL_INSN | |
3428 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3429 | replace_call_placeholder (insn, sibcall_use_normal); | |
3430 | ||
3431 | /* If this was a potential tail recursion site, then emit a | |
3432 | CALL_PLACEHOLDER with the normal and the tail recursion streams. | |
3433 | One of them will be selected later. */ | |
3434 | if (tail_recursion_insns || tail_call_insns) | |
3435 | { | |
3436 | /* The tail recursion label must be kept around. We could expose | |
3437 | its use in the CALL_PLACEHOLDER, but that creates unwanted edges | |
3438 | and makes determining true tail recursion sites difficult. | |
3439 | ||
3440 | So we set LABEL_PRESERVE_P here, then clear it when we select | |
3441 | one of the call sequences after rtl generation is complete. */ | |
3442 | if (tail_recursion_insns) | |
3443 | LABEL_PRESERVE_P (tail_recursion_label) = 1; | |
3444 | emit_call_insn (gen_rtx_CALL_PLACEHOLDER (VOIDmode, normal_call_insns, | |
3445 | tail_call_insns, | |
3446 | tail_recursion_insns, | |
3447 | tail_recursion_label)); | |
3448 | } | |
3449 | else | |
3450 | emit_insns (normal_call_insns); | |
51bbfa0c | 3451 | |
0a1c58a2 | 3452 | currently_expanding_call--; |
8e6a59fe | 3453 | |
7393c642 RK |
3454 | /* If this function returns with the stack pointer depressed, ensure |
3455 | this block saves and restores the stack pointer, show it was | |
3456 | changed, and adjust for any outgoing arg space. */ | |
3457 | if (flags & ECF_SP_DEPRESSED) | |
3458 | { | |
3459 | clear_pending_stack_adjust (); | |
3460 | emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx)); | |
3461 | emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx); | |
3462 | save_stack_pointer (); | |
3463 | } | |
3464 | ||
51bbfa0c RS |
3465 | return target; |
3466 | } | |
3467 | \f | |
de76b467 | 3468 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3469 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3470 | parameters are documented in the emit_library_call function below. */ |
de76b467 | 3471 | static rtx |
2a8f6b90 | 3472 | emit_library_call_value_1 (retval, orgfun, value, fn_type, outmode, nargs, p) |
de76b467 JH |
3473 | int retval; |
3474 | rtx orgfun; | |
3475 | rtx value; | |
ebb1b59a | 3476 | enum libcall_type fn_type; |
de76b467 JH |
3477 | enum machine_mode outmode; |
3478 | int nargs; | |
3479 | va_list p; | |
43bc5f13 | 3480 | { |
3c0fca12 RH |
3481 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3482 | struct args_size args_size; | |
3483 | /* Size of arguments before any adjustments (such as rounding). */ | |
3484 | struct args_size original_args_size; | |
3485 | register int argnum; | |
3486 | rtx fun; | |
3487 | int inc; | |
3488 | int count; | |
3489 | struct args_size alignment_pad; | |
3490 | rtx argblock = 0; | |
3491 | CUMULATIVE_ARGS args_so_far; | |
f725a3ec KH |
3492 | struct arg |
3493 | { | |
3494 | rtx value; | |
3495 | enum machine_mode mode; | |
3496 | rtx reg; | |
3497 | int partial; | |
3498 | struct args_size offset; | |
3499 | struct args_size size; | |
3500 | rtx save_area; | |
3501 | }; | |
3c0fca12 RH |
3502 | struct arg *argvec; |
3503 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3504 | rtx call_fusage = 0; | |
3505 | rtx mem_value = 0; | |
5591ee6f | 3506 | rtx valreg; |
3c0fca12 RH |
3507 | int pcc_struct_value = 0; |
3508 | int struct_value_size = 0; | |
52a11cbf | 3509 | int flags; |
3c0fca12 | 3510 | int reg_parm_stack_space = 0; |
3c0fca12 | 3511 | int needed; |
695ee791 | 3512 | rtx before_call; |
3c0fca12 | 3513 | |
f73ad30e | 3514 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3515 | /* Define the boundary of the register parm stack space that needs to be |
3516 | save, if any. */ | |
3517 | int low_to_save = -1, high_to_save = 0; | |
f725a3ec | 3518 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3519 | #endif |
3520 | ||
3c0fca12 RH |
3521 | /* Size of the stack reserved for parameter registers. */ |
3522 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3523 | char *initial_stack_usage_map = stack_usage_map; | |
3c0fca12 RH |
3524 | |
3525 | #ifdef REG_PARM_STACK_SPACE | |
3526 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
3527 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
3528 | #else | |
3529 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); | |
3530 | #endif | |
3531 | #endif | |
3532 | ||
9555a122 | 3533 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3534 | flags = ECF_NOTHROW; |
3535 | ||
9555a122 RH |
3536 | switch (fn_type) |
3537 | { | |
3538 | case LCT_NORMAL: | |
3539 | case LCT_CONST: | |
3540 | case LCT_PURE: | |
3541 | /* Nothing to do here. */ | |
3542 | break; | |
3543 | case LCT_CONST_MAKE_BLOCK: | |
3544 | flags |= ECF_CONST; | |
3545 | break; | |
3546 | case LCT_PURE_MAKE_BLOCK: | |
3547 | flags |= ECF_PURE; | |
3548 | break; | |
3549 | case LCT_NORETURN: | |
3550 | flags |= ECF_NORETURN; | |
3551 | break; | |
3552 | case LCT_THROW: | |
3553 | flags = ECF_NORETURN; | |
3554 | break; | |
9d98f8f9 JH |
3555 | case LCT_ALWAYS_RETURN: |
3556 | flags = ECF_ALWAYS_RETURN; | |
3557 | break; | |
9555a122 | 3558 | } |
3c0fca12 RH |
3559 | fun = orgfun; |
3560 | ||
3c0fca12 RH |
3561 | #ifdef PREFERRED_STACK_BOUNDARY |
3562 | /* Ensure current function's preferred stack boundary is at least | |
3563 | what we need. */ | |
3564 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3565 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3566 | #endif | |
3567 | ||
3568 | /* If this kind of value comes back in memory, | |
3569 | decide where in memory it should come back. */ | |
de76b467 | 3570 | if (outmode != VOIDmode && aggregate_value_p (type_for_mode (outmode, 0))) |
3c0fca12 RH |
3571 | { |
3572 | #ifdef PCC_STATIC_STRUCT_RETURN | |
3573 | rtx pointer_reg | |
3574 | = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)), | |
3575 | 0, 0); | |
3576 | mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3577 | pcc_struct_value = 1; | |
3578 | if (value == 0) | |
3579 | value = gen_reg_rtx (outmode); | |
3580 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
3581 | struct_value_size = GET_MODE_SIZE (outmode); | |
3582 | if (value != 0 && GET_CODE (value) == MEM) | |
3583 | mem_value = value; | |
3584 | else | |
1da68f56 | 3585 | mem_value = assign_temp (type_for_mode (outmode, 0), 0, 1, 1); |
3c0fca12 RH |
3586 | #endif |
3587 | ||
3588 | /* This call returns a big structure. */ | |
2a8f6b90 | 3589 | flags &= ~(ECF_CONST | ECF_PURE); |
3c0fca12 RH |
3590 | } |
3591 | ||
3592 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3593 | ||
3594 | /* Copy all the libcall-arguments out of the varargs data | |
3595 | and into a vector ARGVEC. | |
3596 | ||
3597 | Compute how to pass each argument. We only support a very small subset | |
3598 | of the full argument passing conventions to limit complexity here since | |
3599 | library functions shouldn't have many args. */ | |
3600 | ||
3601 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
961192e1 | 3602 | memset ((char *) argvec, 0, (nargs + 1) * sizeof (struct arg)); |
3c0fca12 | 3603 | |
97fc4caf AO |
3604 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3605 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3606 | #else | |
3c0fca12 | 3607 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0); |
97fc4caf | 3608 | #endif |
3c0fca12 RH |
3609 | |
3610 | args_size.constant = 0; | |
3611 | args_size.var = 0; | |
3612 | ||
3613 | count = 0; | |
3614 | ||
ebb1b59a BS |
3615 | /* Now we are about to start emitting insns that can be deleted |
3616 | if a libcall is deleted. */ | |
3617 | if (flags & (ECF_CONST | ECF_PURE)) | |
3618 | start_sequence (); | |
3619 | ||
3c0fca12 RH |
3620 | push_temp_slots (); |
3621 | ||
3622 | /* If there's a structure value address to be passed, | |
3623 | either pass it in the special place, or pass it as an extra argument. */ | |
3624 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) | |
3625 | { | |
3626 | rtx addr = XEXP (mem_value, 0); | |
3627 | nargs++; | |
3628 | ||
3629 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3630 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
3631 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3632 | addr = force_operand (addr, NULL_RTX); | |
3633 | ||
3634 | argvec[count].value = addr; | |
3635 | argvec[count].mode = Pmode; | |
3636 | argvec[count].partial = 0; | |
3637 | ||
3638 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
3639 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3640 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) | |
3641 | abort (); | |
3642 | #endif | |
3643 | ||
3644 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f CM |
3645 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3646 | 1, | |
3647 | #else | |
3648 | argvec[count].reg != 0, | |
3649 | #endif | |
3c0fca12 RH |
3650 | NULL_TREE, &args_size, &argvec[count].offset, |
3651 | &argvec[count].size, &alignment_pad); | |
3652 | ||
3c0fca12 RH |
3653 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3654 | || reg_parm_stack_space > 0) | |
3655 | args_size.constant += argvec[count].size.constant; | |
3656 | ||
3657 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3658 | ||
3659 | count++; | |
3660 | } | |
3661 | ||
3662 | for (; count < nargs; count++) | |
3663 | { | |
3664 | rtx val = va_arg (p, rtx); | |
3665 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3666 | ||
3667 | /* We cannot convert the arg value to the mode the library wants here; | |
3668 | must do it earlier where we know the signedness of the arg. */ | |
3669 | if (mode == BLKmode | |
3670 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
3671 | abort (); | |
3672 | ||
3673 | /* On some machines, there's no way to pass a float to a library fcn. | |
3674 | Pass it as a double instead. */ | |
3675 | #ifdef LIBGCC_NEEDS_DOUBLE | |
3676 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
3677 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; | |
3678 | #endif | |
3679 | ||
3680 | /* There's no need to call protect_from_queue, because | |
3681 | either emit_move_insn or emit_push_insn will do that. */ | |
3682 | ||
3683 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3684 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
3685 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3686 | val = force_operand (val, NULL_RTX); | |
3687 | ||
3688 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
3689 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
3690 | { | |
f474c6f8 AO |
3691 | rtx slot; |
3692 | int must_copy = 1 | |
3693 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
3694 | && ! FUNCTION_ARG_CALLEE_COPIES (args_so_far, mode, | |
3695 | NULL_TREE, 1) | |
3696 | #endif | |
3697 | ; | |
3698 | ||
3699 | if (GET_MODE (val) == MEM && ! must_copy) | |
3700 | slot = val; | |
3701 | else if (must_copy) | |
3702 | { | |
3703 | slot = assign_temp (type_for_mode (mode, 0), 0, 1, 1); | |
3704 | emit_move_insn (slot, val); | |
3705 | } | |
3706 | else | |
3707 | { | |
3708 | tree type = type_for_mode (mode, 0); | |
3709 | ||
4cfc6042 | 3710 | slot = gen_rtx_MEM (mode, |
f474c6f8 AO |
3711 | expand_expr (build1 (ADDR_EXPR, |
3712 | build_pointer_type | |
3713 | (type), | |
3714 | make_tree (type, val)), | |
3715 | NULL_RTX, VOIDmode, 0)); | |
3716 | } | |
1da68f56 | 3717 | |
6b5273c3 AO |
3718 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3719 | gen_rtx_USE (VOIDmode, slot), | |
3720 | call_fusage); | |
f474c6f8 AO |
3721 | if (must_copy) |
3722 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3723 | gen_rtx_CLOBBER (VOIDmode, | |
3724 | slot), | |
3725 | call_fusage); | |
3726 | ||
3c0fca12 | 3727 | mode = Pmode; |
f474c6f8 | 3728 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 RH |
3729 | } |
3730 | #endif | |
3731 | ||
3732 | argvec[count].value = val; | |
3733 | argvec[count].mode = mode; | |
3734 | ||
3735 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3736 | ||
3737 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3738 | argvec[count].partial | |
3739 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
3740 | #else | |
3741 | argvec[count].partial = 0; | |
3742 | #endif | |
3743 | ||
3744 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3745 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
f725a3ec | 3746 | 1, |
a4d5044f CM |
3747 | #else |
3748 | argvec[count].reg != 0, | |
3749 | #endif | |
3c0fca12 RH |
3750 | NULL_TREE, &args_size, &argvec[count].offset, |
3751 | &argvec[count].size, &alignment_pad); | |
3752 | ||
3753 | if (argvec[count].size.var) | |
3754 | abort (); | |
3755 | ||
3756 | if (reg_parm_stack_space == 0 && argvec[count].partial) | |
3757 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
3758 | ||
3759 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
3760 | || reg_parm_stack_space > 0) | |
3761 | args_size.constant += argvec[count].size.constant; | |
3762 | ||
3763 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3764 | } | |
3c0fca12 RH |
3765 | |
3766 | #ifdef FINAL_REG_PARM_STACK_SPACE | |
3767 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
3768 | args_size.var); | |
3769 | #endif | |
3770 | /* If this machine requires an external definition for library | |
3771 | functions, write one out. */ | |
3772 | assemble_external_libcall (fun); | |
3773 | ||
3774 | original_args_size = args_size; | |
3775 | #ifdef PREFERRED_STACK_BOUNDARY | |
1503a7ec JH |
3776 | args_size.constant = (((args_size.constant |
3777 | + stack_pointer_delta | |
3778 | + STACK_BYTES - 1) | |
3779 | / STACK_BYTES | |
3780 | * STACK_BYTES) | |
3781 | - stack_pointer_delta); | |
3c0fca12 RH |
3782 | #endif |
3783 | ||
3784 | args_size.constant = MAX (args_size.constant, | |
3785 | reg_parm_stack_space); | |
3786 | ||
3787 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3788 | args_size.constant -= reg_parm_stack_space; | |
3789 | #endif | |
3790 | ||
3791 | if (args_size.constant > current_function_outgoing_args_size) | |
3792 | current_function_outgoing_args_size = args_size.constant; | |
3793 | ||
f73ad30e JH |
3794 | if (ACCUMULATE_OUTGOING_ARGS) |
3795 | { | |
3796 | /* Since the stack pointer will never be pushed, it is possible for | |
3797 | the evaluation of a parm to clobber something we have already | |
3798 | written to the stack. Since most function calls on RISC machines | |
3799 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3800 | |
f73ad30e JH |
3801 | Therefore, we save any area of the stack that was already written |
3802 | and that we are using. Here we set up to do this by making a new | |
3803 | stack usage map from the old one. | |
3c0fca12 | 3804 | |
f73ad30e JH |
3805 | Another approach might be to try to reorder the argument |
3806 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3807 | |
f73ad30e | 3808 | needed = args_size.constant; |
3c0fca12 RH |
3809 | |
3810 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
f73ad30e JH |
3811 | /* Since we will be writing into the entire argument area, the |
3812 | map must be allocated for its entire size, not just the part that | |
3813 | is the responsibility of the caller. */ | |
3814 | needed += reg_parm_stack_space; | |
3c0fca12 RH |
3815 | #endif |
3816 | ||
3817 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3818 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3819 | needed + 1); | |
3c0fca12 | 3820 | #else |
f73ad30e JH |
3821 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3822 | needed); | |
3c0fca12 | 3823 | #endif |
f73ad30e | 3824 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); |
3c0fca12 | 3825 | |
f73ad30e | 3826 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3827 | memcpy (stack_usage_map, initial_stack_usage_map, |
3828 | initial_highest_arg_in_use); | |
3c0fca12 | 3829 | |
f73ad30e | 3830 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3831 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3832 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3833 | needed = 0; | |
3c0fca12 | 3834 | |
c39ada04 DD |
3835 | /* We must be careful to use virtual regs before they're instantiated, |
3836 | and real regs afterwards. Loop optimization, for example, can create | |
3837 | new libcalls after we've instantiated the virtual regs, and if we | |
3838 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3839 | |
c39ada04 DD |
3840 | if (virtuals_instantiated) |
3841 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3842 | else | |
3843 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3844 | } |
3845 | else | |
3846 | { | |
3847 | if (!PUSH_ARGS) | |
3848 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3849 | } | |
3c0fca12 | 3850 | |
3c0fca12 RH |
3851 | #ifdef PREFERRED_STACK_BOUNDARY |
3852 | /* If we push args individually in reverse order, perform stack alignment | |
3853 | before the first push (the last arg). */ | |
f73ad30e | 3854 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3855 | anti_adjust_stack (GEN_INT (args_size.constant |
3856 | - original_args_size.constant)); | |
3857 | #endif | |
3c0fca12 | 3858 | |
f73ad30e JH |
3859 | if (PUSH_ARGS_REVERSED) |
3860 | { | |
3861 | inc = -1; | |
3862 | argnum = nargs - 1; | |
3863 | } | |
3864 | else | |
3865 | { | |
3866 | inc = 1; | |
3867 | argnum = 0; | |
3868 | } | |
3c0fca12 | 3869 | |
f73ad30e JH |
3870 | #ifdef REG_PARM_STACK_SPACE |
3871 | if (ACCUMULATE_OUTGOING_ARGS) | |
3872 | { | |
3873 | /* The argument list is the property of the called routine and it | |
3874 | may clobber it. If the fixed area has been used for previous | |
3875 | parameters, we must save and restore it. | |
3c0fca12 | 3876 | |
f73ad30e | 3877 | Here we compute the boundary of the that needs to be saved, if any. */ |
3c0fca12 RH |
3878 | |
3879 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e | 3880 | for (count = 0; count < reg_parm_stack_space + 1; count++) |
3c0fca12 | 3881 | #else |
f73ad30e | 3882 | for (count = 0; count < reg_parm_stack_space; count++) |
3c0fca12 | 3883 | #endif |
f73ad30e | 3884 | { |
f725a3ec | 3885 | if (count >= highest_outgoing_arg_in_use |
f73ad30e JH |
3886 | || stack_usage_map[count] == 0) |
3887 | continue; | |
3c0fca12 | 3888 | |
f73ad30e JH |
3889 | if (low_to_save == -1) |
3890 | low_to_save = count; | |
3c0fca12 | 3891 | |
f73ad30e JH |
3892 | high_to_save = count; |
3893 | } | |
3c0fca12 | 3894 | |
f73ad30e JH |
3895 | if (low_to_save >= 0) |
3896 | { | |
3897 | int num_to_save = high_to_save - low_to_save + 1; | |
3898 | enum machine_mode save_mode | |
3899 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
3900 | rtx stack_area; | |
3c0fca12 | 3901 | |
f73ad30e JH |
3902 | /* If we don't have the required alignment, must do this in BLKmode. */ |
3903 | if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
3904 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
3905 | save_mode = BLKmode; | |
3c0fca12 RH |
3906 | |
3907 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3908 | stack_area = gen_rtx_MEM (save_mode, |
3909 | memory_address (save_mode, | |
3910 | plus_constant (argblock, | |
f725a3ec | 3911 | -high_to_save))); |
3c0fca12 | 3912 | #else |
f73ad30e JH |
3913 | stack_area = gen_rtx_MEM (save_mode, |
3914 | memory_address (save_mode, | |
3915 | plus_constant (argblock, | |
3916 | low_to_save))); | |
3c0fca12 | 3917 | #endif |
f73ad30e JH |
3918 | if (save_mode == BLKmode) |
3919 | { | |
3920 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
3921 | emit_block_move (validize_mem (save_area), stack_area, | |
19caa751 | 3922 | GEN_INT (num_to_save), PARM_BOUNDARY); |
f73ad30e JH |
3923 | } |
3924 | else | |
3925 | { | |
3926 | save_area = gen_reg_rtx (save_mode); | |
3927 | emit_move_insn (save_area, stack_area); | |
3928 | } | |
3c0fca12 RH |
3929 | } |
3930 | } | |
3931 | #endif | |
f725a3ec | 3932 | |
3c0fca12 RH |
3933 | /* Push the args that need to be pushed. */ |
3934 | ||
3935 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3936 | are to be pushed. */ | |
3937 | for (count = 0; count < nargs; count++, argnum += inc) | |
3938 | { | |
3939 | register enum machine_mode mode = argvec[argnum].mode; | |
3940 | register rtx val = argvec[argnum].value; | |
3941 | rtx reg = argvec[argnum].reg; | |
3942 | int partial = argvec[argnum].partial; | |
f73ad30e | 3943 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3944 | |
3945 | if (! (reg != 0 && partial == 0)) | |
3946 | { | |
f73ad30e JH |
3947 | if (ACCUMULATE_OUTGOING_ARGS) |
3948 | { | |
f8a097cd JH |
3949 | /* If this is being stored into a pre-allocated, fixed-size, |
3950 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3951 | |
3952 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3953 | /* stack_slot is negative, but we want to index stack_usage_map |
3954 | with positive values. */ | |
3955 | upper_bound = -argvec[argnum].offset.constant + 1; | |
3956 | lower_bound = upper_bound - argvec[argnum].size.constant; | |
3c0fca12 | 3957 | #else |
f73ad30e JH |
3958 | lower_bound = argvec[argnum].offset.constant; |
3959 | upper_bound = lower_bound + argvec[argnum].size.constant; | |
3c0fca12 RH |
3960 | #endif |
3961 | ||
f73ad30e JH |
3962 | for (i = lower_bound; i < upper_bound; i++) |
3963 | if (stack_usage_map[i] | |
f8a097cd JH |
3964 | /* Don't store things in the fixed argument area at this |
3965 | point; it has already been saved. */ | |
f73ad30e JH |
3966 | && i > reg_parm_stack_space) |
3967 | break; | |
3c0fca12 | 3968 | |
f73ad30e JH |
3969 | if (i != upper_bound) |
3970 | { | |
f8a097cd | 3971 | /* We need to make a save area. See what mode we can make |
f725a3ec | 3972 | it. */ |
f73ad30e | 3973 | enum machine_mode save_mode |
f8a097cd JH |
3974 | = mode_for_size (argvec[argnum].size.constant |
3975 | * BITS_PER_UNIT, | |
f73ad30e JH |
3976 | MODE_INT, 1); |
3977 | rtx stack_area | |
3978 | = gen_rtx_MEM | |
3979 | (save_mode, | |
3980 | memory_address | |
3981 | (save_mode, | |
3982 | plus_constant (argblock, | |
3983 | argvec[argnum].offset.constant))); | |
3984 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3985 | ||
3986 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3987 | } | |
3c0fca12 | 3988 | } |
19caa751 | 3989 | |
3c0fca12 RH |
3990 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, |
3991 | argblock, GEN_INT (argvec[argnum].offset.constant), | |
3992 | reg_parm_stack_space, ARGS_SIZE_RTX (alignment_pad)); | |
3993 | ||
3c0fca12 | 3994 | /* Now mark the segment we just used. */ |
f73ad30e JH |
3995 | if (ACCUMULATE_OUTGOING_ARGS) |
3996 | for (i = lower_bound; i < upper_bound; i++) | |
3997 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
3998 | |
3999 | NO_DEFER_POP; | |
4000 | } | |
4001 | } | |
4002 | ||
3c0fca12 RH |
4003 | #ifdef PREFERRED_STACK_BOUNDARY |
4004 | /* If we pushed args in forward order, perform stack alignment | |
4005 | after pushing the last arg. */ | |
f73ad30e | 4006 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
3c0fca12 RH |
4007 | anti_adjust_stack (GEN_INT (args_size.constant |
4008 | - original_args_size.constant)); | |
4009 | #endif | |
3c0fca12 | 4010 | |
f73ad30e JH |
4011 | if (PUSH_ARGS_REVERSED) |
4012 | argnum = nargs - 1; | |
4013 | else | |
4014 | argnum = 0; | |
3c0fca12 | 4015 | |
3affaf29 | 4016 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0, 0); |
3c0fca12 RH |
4017 | |
4018 | /* Now load any reg parms into their regs. */ | |
4019 | ||
4020 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
4021 | are to be pushed. */ | |
4022 | for (count = 0; count < nargs; count++, argnum += inc) | |
4023 | { | |
4024 | register rtx val = argvec[argnum].value; | |
4025 | rtx reg = argvec[argnum].reg; | |
4026 | int partial = argvec[argnum].partial; | |
4027 | ||
4028 | /* Handle calls that pass values in multiple non-contiguous | |
4029 | locations. The PA64 has examples of this for library calls. */ | |
4030 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
4031 | emit_group_load (reg, val, | |
4032 | GET_MODE_SIZE (GET_MODE (val)), | |
4033 | GET_MODE_ALIGNMENT (GET_MODE (val))); | |
4034 | else if (reg != 0 && partial == 0) | |
4035 | emit_move_insn (reg, val); | |
4036 | ||
4037 | NO_DEFER_POP; | |
4038 | } | |
4039 | ||
3c0fca12 RH |
4040 | /* Any regs containing parms remain in use through the call. */ |
4041 | for (count = 0; count < nargs; count++) | |
4042 | { | |
4043 | rtx reg = argvec[count].reg; | |
4044 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
4045 | use_group_regs (&call_fusage, reg); | |
4046 | else if (reg != 0) | |
4047 | use_reg (&call_fusage, reg); | |
4048 | } | |
4049 | ||
4050 | /* Pass the function the address in which to return a structure value. */ | |
4051 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) | |
4052 | { | |
4053 | emit_move_insn (struct_value_rtx, | |
4054 | force_reg (Pmode, | |
4055 | force_operand (XEXP (mem_value, 0), | |
4056 | NULL_RTX))); | |
4057 | if (GET_CODE (struct_value_rtx) == REG) | |
f725a3ec | 4058 | use_reg (&call_fusage, struct_value_rtx); |
3c0fca12 RH |
4059 | } |
4060 | ||
4061 | /* Don't allow popping to be deferred, since then | |
4062 | cse'ing of library calls could delete a call and leave the pop. */ | |
4063 | NO_DEFER_POP; | |
5591ee6f JH |
4064 | valreg = (mem_value == 0 && outmode != VOIDmode |
4065 | ? hard_libcall_value (outmode) : NULL_RTX); | |
3c0fca12 | 4066 | |
ebcd0b57 | 4067 | #ifdef PREFERRED_STACK_BOUNDARY |
ce48579b | 4068 | /* Stack must be properly aligned now. */ |
ebcd0b57 | 4069 | if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)) |
f725a3ec | 4070 | abort (); |
ebcd0b57 JH |
4071 | #endif |
4072 | ||
695ee791 RH |
4073 | before_call = get_last_insn (); |
4074 | ||
3c0fca12 RH |
4075 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
4076 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
4077 | /* The return type is needed to decide how many bytes the function pops. |
4078 | Signedness plays no role in that, so for simplicity, we pretend it's | |
4079 | always signed. We also assume that the list of arguments passed has | |
4080 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 4081 | |
f725a3ec KH |
4082 | emit_call_1 (fun, |
4083 | get_identifier (XSTR (orgfun, 0)), | |
de76b467 JH |
4084 | build_function_type (outmode == VOIDmode ? void_type_node |
4085 | : type_for_mode (outmode, 0), NULL_TREE), | |
f725a3ec | 4086 | original_args_size.constant, args_size.constant, |
3c0fca12 RH |
4087 | struct_value_size, |
4088 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
5591ee6f | 4089 | valreg, |
f2d33f13 | 4090 | old_inhibit_defer_pop + 1, call_fusage, flags); |
3c0fca12 | 4091 | |
695ee791 RH |
4092 | /* For calls to `setjmp', etc., inform flow.c it should complain |
4093 | if nonvolatile values are live. For functions that cannot return, | |
4094 | inform flow that control does not fall through. */ | |
4095 | ||
570a98eb | 4096 | if (flags & (ECF_NORETURN | ECF_LONGJMP)) |
695ee791 | 4097 | { |
570a98eb | 4098 | /* The barrier note must be emitted |
695ee791 RH |
4099 | immediately after the CALL_INSN. Some ports emit more than |
4100 | just a CALL_INSN above, so we must search for it here. */ | |
4101 | ||
4102 | rtx last = get_last_insn (); | |
4103 | while (GET_CODE (last) != CALL_INSN) | |
4104 | { | |
4105 | last = PREV_INSN (last); | |
4106 | /* There was no CALL_INSN? */ | |
4107 | if (last == before_call) | |
4108 | abort (); | |
4109 | } | |
4110 | ||
570a98eb | 4111 | emit_barrier_after (last); |
695ee791 RH |
4112 | } |
4113 | ||
3c0fca12 RH |
4114 | /* Now restore inhibit_defer_pop to its actual original value. */ |
4115 | OK_DEFER_POP; | |
4116 | ||
ebb1b59a BS |
4117 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
4118 | Test valreg so we don't crash; may safely ignore `const' | |
4119 | if return type is void. Disable for PARALLEL return values, because | |
4120 | we have no way to move such values into a pseudo register. */ | |
4121 | if ((flags & (ECF_CONST | ECF_PURE)) | |
4122 | && valreg != 0 && GET_CODE (valreg) != PARALLEL) | |
4123 | { | |
4124 | rtx note = 0; | |
4125 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
4126 | rtx insns; | |
4127 | int i; | |
4128 | ||
4129 | /* Construct an "equal form" for the value which mentions all the | |
4130 | arguments in order as well as the function name. */ | |
4131 | for (i = 0; i < nargs; i++) | |
4132 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
4133 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
4134 | ||
4135 | insns = get_insns (); | |
4136 | end_sequence (); | |
4137 | ||
4138 | if (flags & ECF_PURE) | |
4139 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
4140 | gen_rtx_USE (VOIDmode, | |
4141 | gen_rtx_MEM (BLKmode, | |
4142 | gen_rtx_SCRATCH (VOIDmode))), note); | |
4143 | ||
4144 | emit_libcall_block (insns, temp, valreg, note); | |
4145 | ||
4146 | valreg = temp; | |
4147 | } | |
4148 | else if (flags & (ECF_CONST | ECF_PURE)) | |
4149 | { | |
4150 | /* Otherwise, just write out the sequence without a note. */ | |
4151 | rtx insns = get_insns (); | |
4152 | ||
4153 | end_sequence (); | |
4154 | emit_insns (insns); | |
4155 | } | |
3c0fca12 RH |
4156 | pop_temp_slots (); |
4157 | ||
4158 | /* Copy the value to the right place. */ | |
de76b467 | 4159 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
4160 | { |
4161 | if (mem_value) | |
4162 | { | |
4163 | if (value == 0) | |
4164 | value = mem_value; | |
4165 | if (value != mem_value) | |
4166 | emit_move_insn (value, mem_value); | |
4167 | } | |
4168 | else if (value != 0) | |
d4c68376 | 4169 | emit_move_insn (value, hard_libcall_value (outmode)); |
3c0fca12 | 4170 | else |
d4c68376 | 4171 | value = hard_libcall_value (outmode); |
3c0fca12 RH |
4172 | } |
4173 | ||
f73ad30e | 4174 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 4175 | { |
f73ad30e JH |
4176 | #ifdef REG_PARM_STACK_SPACE |
4177 | if (save_area) | |
4178 | { | |
4179 | enum machine_mode save_mode = GET_MODE (save_area); | |
3c0fca12 | 4180 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4181 | rtx stack_area |
4182 | = gen_rtx_MEM (save_mode, | |
4183 | memory_address (save_mode, | |
4184 | plus_constant (argblock, | |
4185 | - high_to_save))); | |
3c0fca12 | 4186 | #else |
f73ad30e JH |
4187 | rtx stack_area |
4188 | = gen_rtx_MEM (save_mode, | |
4189 | memory_address (save_mode, | |
4190 | plus_constant (argblock, low_to_save))); | |
3c0fca12 | 4191 | #endif |
f73ad30e JH |
4192 | if (save_mode != BLKmode) |
4193 | emit_move_insn (stack_area, save_area); | |
4194 | else | |
4195 | emit_block_move (stack_area, validize_mem (save_area), | |
4196 | GEN_INT (high_to_save - low_to_save + 1), | |
19caa751 | 4197 | PARM_BOUNDARY); |
f73ad30e | 4198 | } |
3c0fca12 | 4199 | #endif |
f725a3ec | 4200 | |
f73ad30e JH |
4201 | /* If we saved any argument areas, restore them. */ |
4202 | for (count = 0; count < nargs; count++) | |
4203 | if (argvec[count].save_area) | |
4204 | { | |
4205 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
4206 | rtx stack_area | |
4207 | = gen_rtx_MEM (save_mode, | |
4208 | memory_address | |
4209 | (save_mode, | |
4210 | plus_constant (argblock, | |
4211 | argvec[count].offset.constant))); | |
4212 | ||
4213 | emit_move_insn (stack_area, argvec[count].save_area); | |
4214 | } | |
3c0fca12 | 4215 | |
f73ad30e JH |
4216 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4217 | stack_usage_map = initial_stack_usage_map; | |
4218 | } | |
43bc5f13 | 4219 | |
de76b467 JH |
4220 | return value; |
4221 | ||
4222 | } | |
4223 | \f | |
4224 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4225 | (emitting the queue unless NO_QUEUE is nonzero), | |
4226 | for a value of mode OUTMODE, | |
4227 | with NARGS different arguments, passed as alternating rtx values | |
4228 | and machine_modes to convert them to. | |
4229 | The rtx values should have been passed through protect_from_queue already. | |
4230 | ||
2a8f6b90 JH |
4231 | FN_TYPE will is zero for `normal' calls, one for `const' calls, wich |
4232 | which will be enclosed in REG_LIBCALL/REG_RETVAL notes and two for `pure' | |
4233 | calls, that are handled like `const' calls with extra | |
4234 | (use (memory (scratch)). */ | |
de76b467 JH |
4235 | |
4236 | void | |
ebb1b59a BS |
4237 | emit_library_call VPARAMS((rtx orgfun, enum libcall_type fn_type, |
4238 | enum machine_mode outmode, int nargs, ...)) | |
de76b467 JH |
4239 | { |
4240 | #ifndef ANSI_PROTOTYPES | |
4241 | rtx orgfun; | |
2a8f6b90 | 4242 | int fn_type; |
de76b467 JH |
4243 | enum machine_mode outmode; |
4244 | int nargs; | |
4245 | #endif | |
4246 | va_list p; | |
4247 | ||
4248 | VA_START (p, nargs); | |
4249 | ||
4250 | #ifndef ANSI_PROTOTYPES | |
4251 | orgfun = va_arg (p, rtx); | |
2a8f6b90 | 4252 | fn_type = va_arg (p, int); |
de76b467 JH |
4253 | outmode = va_arg (p, enum machine_mode); |
4254 | nargs = va_arg (p, int); | |
4255 | #endif | |
4256 | ||
2a8f6b90 | 4257 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
de76b467 JH |
4258 | |
4259 | va_end (p); | |
4260 | } | |
4261 | \f | |
4262 | /* Like emit_library_call except that an extra argument, VALUE, | |
4263 | comes second and says where to store the result. | |
4264 | (If VALUE is zero, this function chooses a convenient way | |
4265 | to return the value. | |
4266 | ||
4267 | This function returns an rtx for where the value is to be found. | |
4268 | If VALUE is nonzero, VALUE is returned. */ | |
4269 | ||
4270 | rtx | |
ebb1b59a BS |
4271 | emit_library_call_value VPARAMS((rtx orgfun, rtx value, |
4272 | enum libcall_type fn_type, | |
de76b467 JH |
4273 | enum machine_mode outmode, int nargs, ...)) |
4274 | { | |
4275 | #ifndef ANSI_PROTOTYPES | |
4276 | rtx orgfun; | |
4277 | rtx value; | |
2a8f6b90 | 4278 | int fn_type; |
de76b467 JH |
4279 | enum machine_mode outmode; |
4280 | int nargs; | |
4281 | #endif | |
4282 | va_list p; | |
4283 | ||
4284 | VA_START (p, nargs); | |
4285 | ||
4286 | #ifndef ANSI_PROTOTYPES | |
4287 | orgfun = va_arg (p, rtx); | |
4288 | value = va_arg (p, rtx); | |
2a8f6b90 | 4289 | fn_type = va_arg (p, int); |
de76b467 JH |
4290 | outmode = va_arg (p, enum machine_mode); |
4291 | nargs = va_arg (p, int); | |
4292 | #endif | |
4293 | ||
2a8f6b90 | 4294 | value = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, nargs, p); |
de76b467 JH |
4295 | |
4296 | va_end (p); | |
4297 | ||
fac0ad80 | 4298 | return value; |
322e3e34 RK |
4299 | } |
4300 | \f | |
51bbfa0c RS |
4301 | #if 0 |
4302 | /* Return an rtx which represents a suitable home on the stack | |
4303 | given TYPE, the type of the argument looking for a home. | |
4304 | This is called only for BLKmode arguments. | |
4305 | ||
4306 | SIZE is the size needed for this target. | |
4307 | ARGS_ADDR is the address of the bottom of the argument block for this call. | |
4308 | OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless | |
4309 | if this machine uses push insns. */ | |
4310 | ||
4311 | static rtx | |
4312 | target_for_arg (type, size, args_addr, offset) | |
4313 | tree type; | |
4314 | rtx size; | |
4315 | rtx args_addr; | |
4316 | struct args_size offset; | |
4317 | { | |
4318 | rtx target; | |
4319 | rtx offset_rtx = ARGS_SIZE_RTX (offset); | |
4320 | ||
4321 | /* We do not call memory_address if possible, | |
4322 | because we want to address as close to the stack | |
4323 | as possible. For non-variable sized arguments, | |
4324 | this will be stack-pointer relative addressing. */ | |
4325 | if (GET_CODE (offset_rtx) == CONST_INT) | |
4326 | target = plus_constant (args_addr, INTVAL (offset_rtx)); | |
4327 | else | |
4328 | { | |
4329 | /* I have no idea how to guarantee that this | |
4330 | will work in the presence of register parameters. */ | |
38a448ca | 4331 | target = gen_rtx_PLUS (Pmode, args_addr, offset_rtx); |
51bbfa0c RS |
4332 | target = memory_address (QImode, target); |
4333 | } | |
4334 | ||
38a448ca | 4335 | return gen_rtx_MEM (BLKmode, target); |
51bbfa0c RS |
4336 | } |
4337 | #endif | |
4338 | \f | |
4339 | /* Store a single argument for a function call | |
4340 | into the register or memory area where it must be passed. | |
4341 | *ARG describes the argument value and where to pass it. | |
4342 | ||
4343 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 4344 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
4345 | |
4346 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 4347 | so must be careful about how the stack is used. |
51bbfa0c RS |
4348 | |
4349 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4350 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4351 | that we need not worry about saving and restoring the stack. | |
4352 | ||
4c6b3b2a | 4353 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 4354 | |
4c6b3b2a JJ |
4355 | Return non-zero if this arg should cause sibcall failure, |
4356 | zero otherwise. */ | |
51bbfa0c | 4357 | |
4c6b3b2a | 4358 | static int |
f725a3ec | 4359 | store_one_arg (arg, argblock, flags, variable_size, reg_parm_stack_space) |
51bbfa0c RS |
4360 | struct arg_data *arg; |
4361 | rtx argblock; | |
f8a097cd | 4362 | int flags; |
0f9b3ea6 | 4363 | int variable_size ATTRIBUTE_UNUSED; |
6f90e075 | 4364 | int reg_parm_stack_space; |
51bbfa0c RS |
4365 | { |
4366 | register tree pval = arg->tree_value; | |
4367 | rtx reg = 0; | |
4368 | int partial = 0; | |
4369 | int used = 0; | |
6a651371 | 4370 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 4371 | int sibcall_failure = 0; |
51bbfa0c RS |
4372 | |
4373 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4374 | return 1; |
51bbfa0c | 4375 | |
cc79451b RK |
4376 | /* Push a new temporary level for any temporaries we make for |
4377 | this argument. */ | |
4378 | push_temp_slots (); | |
4379 | ||
f8a097cd | 4380 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4381 | { |
f73ad30e JH |
4382 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4383 | save any previous data at that location. */ | |
4384 | if (argblock && ! variable_size && arg->stack) | |
4385 | { | |
51bbfa0c | 4386 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4387 | /* stack_slot is negative, but we want to index stack_usage_map |
4388 | with positive values. */ | |
4389 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4390 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4391 | else | |
4392 | upper_bound = 0; | |
51bbfa0c | 4393 | |
f73ad30e | 4394 | lower_bound = upper_bound - arg->size.constant; |
51bbfa0c | 4395 | #else |
f73ad30e JH |
4396 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4397 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4398 | else | |
4399 | lower_bound = 0; | |
51bbfa0c | 4400 | |
f73ad30e | 4401 | upper_bound = lower_bound + arg->size.constant; |
51bbfa0c RS |
4402 | #endif |
4403 | ||
f73ad30e JH |
4404 | for (i = lower_bound; i < upper_bound; i++) |
4405 | if (stack_usage_map[i] | |
4406 | /* Don't store things in the fixed argument area at this point; | |
4407 | it has already been saved. */ | |
4408 | && i > reg_parm_stack_space) | |
4409 | break; | |
51bbfa0c | 4410 | |
f73ad30e | 4411 | if (i != upper_bound) |
51bbfa0c | 4412 | { |
f73ad30e JH |
4413 | /* We need to make a save area. See what mode we can make it. */ |
4414 | enum machine_mode save_mode | |
4415 | = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); | |
4416 | rtx stack_area | |
4417 | = gen_rtx_MEM (save_mode, | |
4418 | memory_address (save_mode, | |
4419 | XEXP (arg->stack_slot, 0))); | |
4420 | ||
4421 | if (save_mode == BLKmode) | |
4422 | { | |
1da68f56 RK |
4423 | tree ot = TREE_TYPE (arg->tree_value); |
4424 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4425 | | TYPE_QUAL_CONST)); | |
4426 | ||
4427 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
f73ad30e JH |
4428 | preserve_temp_slots (arg->save_area); |
4429 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
1da68f56 RK |
4430 | expr_size (arg->tree_value), |
4431 | MIN (PARM_BOUNDARY, TYPE_ALIGN (nt))); | |
f73ad30e JH |
4432 | } |
4433 | else | |
4434 | { | |
4435 | arg->save_area = gen_reg_rtx (save_mode); | |
4436 | emit_move_insn (arg->save_area, stack_area); | |
4437 | } | |
51bbfa0c RS |
4438 | } |
4439 | } | |
f73ad30e JH |
4440 | /* Now that we have saved any slots that will be overwritten by this |
4441 | store, mark all slots this store will use. We must do this before | |
4442 | we actually expand the argument since the expansion itself may | |
4443 | trigger library calls which might need to use the same stack slot. */ | |
4444 | if (argblock && ! variable_size && arg->stack) | |
4445 | for (i = lower_bound; i < upper_bound; i++) | |
4446 | stack_usage_map[i] = 1; | |
51bbfa0c | 4447 | } |
b564df06 | 4448 | |
51bbfa0c RS |
4449 | /* If this isn't going to be placed on both the stack and in registers, |
4450 | set up the register and number of words. */ | |
4451 | if (! arg->pass_on_stack) | |
4452 | reg = arg->reg, partial = arg->partial; | |
4453 | ||
4454 | if (reg != 0 && partial == 0) | |
4455 | /* Being passed entirely in a register. We shouldn't be called in | |
4456 | this case. */ | |
4457 | abort (); | |
4458 | ||
4ab56118 RK |
4459 | /* If this arg needs special alignment, don't load the registers |
4460 | here. */ | |
4461 | if (arg->n_aligned_regs != 0) | |
4462 | reg = 0; | |
f725a3ec | 4463 | |
4ab56118 | 4464 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4465 | it directly into its stack slot. Otherwise, we can. */ |
4466 | if (arg->value == 0) | |
d64f5a78 | 4467 | { |
d64f5a78 RS |
4468 | /* stack_arg_under_construction is nonzero if a function argument is |
4469 | being evaluated directly into the outgoing argument list and | |
4470 | expand_call must take special action to preserve the argument list | |
4471 | if it is called recursively. | |
4472 | ||
4473 | For scalar function arguments stack_usage_map is sufficient to | |
4474 | determine which stack slots must be saved and restored. Scalar | |
4475 | arguments in general have pass_on_stack == 0. | |
4476 | ||
4477 | If this argument is initialized by a function which takes the | |
4478 | address of the argument (a C++ constructor or a C function | |
4479 | returning a BLKmode structure), then stack_usage_map is | |
4480 | insufficient and expand_call must push the stack around the | |
4481 | function call. Such arguments have pass_on_stack == 1. | |
4482 | ||
4483 | Note that it is always safe to set stack_arg_under_construction, | |
4484 | but this generates suboptimal code if set when not needed. */ | |
4485 | ||
4486 | if (arg->pass_on_stack) | |
4487 | stack_arg_under_construction++; | |
f73ad30e | 4488 | |
3a08477a RK |
4489 | arg->value = expand_expr (pval, |
4490 | (partial | |
4491 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4492 | ? NULL_RTX : arg->stack, | |
e5d70561 | 4493 | VOIDmode, 0); |
1efe6448 RK |
4494 | |
4495 | /* If we are promoting object (or for any other reason) the mode | |
4496 | doesn't agree, convert the mode. */ | |
4497 | ||
7373d92d RK |
4498 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4499 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4500 | arg->value, arg->unsignedp); | |
1efe6448 | 4501 | |
d64f5a78 RS |
4502 | if (arg->pass_on_stack) |
4503 | stack_arg_under_construction--; | |
d64f5a78 | 4504 | } |
51bbfa0c RS |
4505 | |
4506 | /* Don't allow anything left on stack from computation | |
4507 | of argument to alloca. */ | |
f8a097cd | 4508 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4509 | do_pending_stack_adjust (); |
4510 | ||
4511 | if (arg->value == arg->stack) | |
7815214e | 4512 | { |
c5c76735 | 4513 | /* If the value is already in the stack slot, we are done. */ |
7d384cc0 | 4514 | if (current_function_check_memory_usage && GET_CODE (arg->stack) == MEM) |
7815214e | 4515 | { |
ebb1b59a BS |
4516 | emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK, |
4517 | VOIDmode, 3, XEXP (arg->stack, 0), Pmode, | |
7d384cc0 | 4518 | ARGS_SIZE_RTX (arg->size), |
7815214e | 4519 | TYPE_MODE (sizetype), |
956d6950 JL |
4520 | GEN_INT (MEMORY_USE_RW), |
4521 | TYPE_MODE (integer_type_node)); | |
7815214e RK |
4522 | } |
4523 | } | |
1efe6448 | 4524 | else if (arg->mode != BLKmode) |
51bbfa0c RS |
4525 | { |
4526 | register int size; | |
4527 | ||
4528 | /* Argument is a scalar, not entirely passed in registers. | |
4529 | (If part is passed in registers, arg->partial says how much | |
4530 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4531 | |
51bbfa0c RS |
4532 | Push it, and if its size is less than the |
4533 | amount of space allocated to it, | |
4534 | also bump stack pointer by the additional space. | |
4535 | Note that in C the default argument promotions | |
4536 | will prevent such mismatches. */ | |
4537 | ||
1efe6448 | 4538 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4539 | /* Compute how much space the push instruction will push. |
4540 | On many machines, pushing a byte will advance the stack | |
4541 | pointer by a halfword. */ | |
4542 | #ifdef PUSH_ROUNDING | |
4543 | size = PUSH_ROUNDING (size); | |
4544 | #endif | |
4545 | used = size; | |
4546 | ||
4547 | /* Compute how much space the argument should get: | |
4548 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4549 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4550 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4551 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4552 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4553 | ||
4554 | /* This isn't already where we want it on the stack, so put it there. | |
4555 | This can either be done with push or copy insns. */ | |
e5e809f4 JL |
4556 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, 0, |
4557 | partial, reg, used - size, argblock, | |
4fc026cd CM |
4558 | ARGS_SIZE_RTX (arg->offset), reg_parm_stack_space, |
4559 | ARGS_SIZE_RTX (arg->alignment_pad)); | |
51bbfa0c RS |
4560 | } |
4561 | else | |
4562 | { | |
4563 | /* BLKmode, at least partly to be pushed. */ | |
4564 | ||
4565 | register int excess; | |
4566 | rtx size_rtx; | |
4567 | ||
4568 | /* Pushing a nonscalar. | |
4569 | If part is passed in registers, PARTIAL says how much | |
4570 | and emit_push_insn will take care of putting it there. */ | |
4571 | ||
4572 | /* Round its size up to a multiple | |
4573 | of the allocation unit for arguments. */ | |
4574 | ||
4575 | if (arg->size.var != 0) | |
4576 | { | |
4577 | excess = 0; | |
4578 | size_rtx = ARGS_SIZE_RTX (arg->size); | |
4579 | } | |
4580 | else | |
4581 | { | |
51bbfa0c RS |
4582 | /* PUSH_ROUNDING has no effect on us, because |
4583 | emit_push_insn for BLKmode is careful to avoid it. */ | |
0cf91217 | 4584 | excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) |
51bbfa0c | 4585 | + partial * UNITS_PER_WORD); |
e4f93898 | 4586 | size_rtx = expr_size (pval); |
51bbfa0c RS |
4587 | } |
4588 | ||
4c6b3b2a JJ |
4589 | if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM) |
4590 | { | |
4591 | /* emit_push_insn might not work properly if arg->value and | |
4592 | argblock + arg->offset areas overlap. */ | |
4593 | rtx x = arg->value; | |
4594 | int i = 0; | |
4595 | ||
4596 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4597 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4598 | && XEXP (XEXP (x, 0), 0) == | |
4599 | current_function_internal_arg_pointer | |
4600 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4601 | { | |
4602 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4603 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4604 | ||
4605 | /* expand_call should ensure this */ | |
4606 | if (arg->offset.var || GET_CODE (size_rtx) != CONST_INT) | |
4607 | abort (); | |
4608 | ||
4609 | if (arg->offset.constant > i) | |
4610 | { | |
4611 | if (arg->offset.constant < i + INTVAL (size_rtx)) | |
4612 | sibcall_failure = 1; | |
4613 | } | |
4614 | else if (arg->offset.constant < i) | |
4615 | { | |
4616 | if (i < arg->offset.constant + INTVAL (size_rtx)) | |
4617 | sibcall_failure = 1; | |
4618 | } | |
4619 | } | |
4620 | } | |
4621 | ||
57ec4709 | 4622 | /* If parm is passed both in stack and in register and offset is |
ec5c56db | 4623 | greater than reg_parm_stack_space, split the offset. */ |
57ec4709 CC |
4624 | if (arg->reg && arg->pass_on_stack) |
4625 | { | |
4626 | if (arg->offset.constant < reg_parm_stack_space && arg->offset.var) | |
4627 | error ("variable offset is passed paritially in stack and in reg"); | |
4628 | else if (arg->offset.constant < reg_parm_stack_space && arg->size.var) | |
4629 | error ("variable size is passed partially in stack and in reg"); | |
4630 | else if (arg->offset.constant < reg_parm_stack_space | |
4631 | && ((arg->offset.constant + arg->size.constant) | |
4632 | > reg_parm_stack_space)) | |
4633 | { | |
4634 | rtx size_rtx1 = GEN_INT (reg_parm_stack_space - arg->offset.constant); | |
4635 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx1, | |
4f380204 DE |
4636 | TYPE_ALIGN (TREE_TYPE (pval)), partial, reg, |
4637 | excess, argblock, ARGS_SIZE_RTX (arg->offset), | |
4638 | reg_parm_stack_space, | |
57ec4709 CC |
4639 | ARGS_SIZE_RTX (arg->alignment_pad)); |
4640 | ||
4641 | size_rtx = GEN_INT (INTVAL(size_rtx) - reg_parm_stack_space); | |
4642 | } | |
4643 | } | |
4644 | ||
4645 | ||
1efe6448 | 4646 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
19caa751 RK |
4647 | TYPE_ALIGN (TREE_TYPE (pval)), partial, reg, excess, |
4648 | argblock, ARGS_SIZE_RTX (arg->offset), | |
4fc026cd CM |
4649 | reg_parm_stack_space, |
4650 | ARGS_SIZE_RTX (arg->alignment_pad)); | |
51bbfa0c RS |
4651 | } |
4652 | ||
51bbfa0c | 4653 | /* Unless this is a partially-in-register argument, the argument is now |
f725a3ec | 4654 | in the stack. |
51bbfa0c RS |
4655 | |
4656 | ??? Note that this can change arg->value from arg->stack to | |
4657 | arg->stack_slot and it matters when they are not the same. | |
4658 | It isn't totally clear that this is correct in all cases. */ | |
4659 | if (partial == 0) | |
3b917a55 | 4660 | arg->value = arg->stack_slot; |
51bbfa0c RS |
4661 | |
4662 | /* Once we have pushed something, pops can't safely | |
4663 | be deferred during the rest of the arguments. */ | |
4664 | NO_DEFER_POP; | |
4665 | ||
4666 | /* ANSI doesn't require a sequence point here, | |
4667 | but PCC has one, so this will avoid some problems. */ | |
4668 | emit_queue (); | |
4669 | ||
db907e7b RK |
4670 | /* Free any temporary slots made in processing this argument. Show |
4671 | that we might have taken the address of something and pushed that | |
4672 | as an operand. */ | |
4673 | preserve_temp_slots (NULL_RTX); | |
51bbfa0c | 4674 | free_temp_slots (); |
cc79451b | 4675 | pop_temp_slots (); |
4c6b3b2a JJ |
4676 | |
4677 | return sibcall_failure; | |
51bbfa0c | 4678 | } |