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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 |
b820d2b8 | 3 | 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
51bbfa0c | 4 | |
1322177d | 5 | This file is part of GCC. |
51bbfa0c | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
51bbfa0c | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
51bbfa0c RS |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
51bbfa0c RS |
21 | |
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
670ee920 KG |
26 | #include "rtl.h" |
27 | #include "tree.h" | |
28 | #include "flags.h" | |
29 | #include "expr.h" | |
6e985040 | 30 | #include "optabs.h" |
e78d8e51 | 31 | #include "libfuncs.h" |
49ad7cfa | 32 | #include "function.h" |
670ee920 | 33 | #include "regs.h" |
5f6da302 | 34 | #include "toplev.h" |
d6f4ec51 | 35 | #include "output.h" |
b1474bb7 | 36 | #include "tm_p.h" |
ea11ca7e | 37 | #include "timevar.h" |
c67846f2 | 38 | #include "sbitmap.h" |
b0c48229 | 39 | #include "langhooks.h" |
23626154 | 40 | #include "target.h" |
b255a036 | 41 | #include "cgraph.h" |
b2dd096b | 42 | #include "except.h" |
51bbfa0c | 43 | |
c39ada04 DD |
44 | #ifndef STACK_POINTER_OFFSET |
45 | #define STACK_POINTER_OFFSET 0 | |
46 | #endif | |
47 | ||
c795bca9 BS |
48 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
49 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
50 | |
51 | /* Data structure and subroutines used within expand_call. */ | |
52 | ||
53 | struct arg_data | |
54 | { | |
55 | /* Tree node for this argument. */ | |
56 | tree tree_value; | |
1efe6448 RK |
57 | /* Mode for value; TYPE_MODE unless promoted. */ |
58 | enum machine_mode mode; | |
51bbfa0c RS |
59 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
60 | rtx value; | |
61 | /* Initially-compute RTL value for argument; only for const functions. */ | |
62 | rtx initial_value; | |
63 | /* Register to pass this argument in, 0 if passed on stack, or an | |
cacbd532 | 64 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
65 | registers. */ |
66 | rtx reg; | |
099e9712 JH |
67 | /* Register to pass this argument in when generating tail call sequence. |
68 | This is not the same register as for normal calls on machines with | |
69 | register windows. */ | |
70 | rtx tail_call_reg; | |
84b55618 RK |
71 | /* If REG was promoted from the actual mode of the argument expression, |
72 | indicates whether the promotion is sign- or zero-extended. */ | |
73 | int unsignedp; | |
51bbfa0c RS |
74 | /* Number of registers to use. 0 means put the whole arg in registers. |
75 | Also 0 if not passed in registers. */ | |
76 | int partial; | |
da7d8304 | 77 | /* Nonzero if argument must be passed on stack. |
d64f5a78 RS |
78 | Note that some arguments may be passed on the stack |
79 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
80 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c | 81 | int pass_on_stack; |
e7949876 AM |
82 | /* Some fields packaged up for locate_and_pad_parm. */ |
83 | struct locate_and_pad_arg_data locate; | |
51bbfa0c RS |
84 | /* Location on the stack at which parameter should be stored. The store |
85 | has already been done if STACK == VALUE. */ | |
86 | rtx stack; | |
87 | /* Location on the stack of the start of this argument slot. This can | |
88 | differ from STACK if this arg pads downward. This location is known | |
89 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
90 | rtx stack_slot; | |
51bbfa0c RS |
91 | /* Place that this stack area has been saved, if needed. */ |
92 | rtx save_area; | |
4ab56118 RK |
93 | /* If an argument's alignment does not permit direct copying into registers, |
94 | copy in smaller-sized pieces into pseudos. These are stored in a | |
95 | block pointed to by this field. The next field says how many | |
96 | word-sized pseudos we made. */ | |
97 | rtx *aligned_regs; | |
98 | int n_aligned_regs; | |
51bbfa0c RS |
99 | }; |
100 | ||
da7d8304 | 101 | /* A vector of one char per byte of stack space. A byte if nonzero if |
51bbfa0c RS |
102 | the corresponding stack location has been used. |
103 | This vector is used to prevent a function call within an argument from | |
104 | clobbering any stack already set up. */ | |
105 | static char *stack_usage_map; | |
106 | ||
107 | /* Size of STACK_USAGE_MAP. */ | |
108 | static int highest_outgoing_arg_in_use; | |
2f4aa534 | 109 | |
c67846f2 JJ |
110 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
111 | stack location's tail call argument has been already stored into the stack. | |
112 | This bitmap is used to prevent sibling call optimization if function tries | |
113 | to use parent's incoming argument slots when they have been already | |
114 | overwritten with tail call arguments. */ | |
115 | static sbitmap stored_args_map; | |
116 | ||
2f4aa534 RS |
117 | /* stack_arg_under_construction is nonzero when an argument may be |
118 | initialized with a constructor call (including a C function that | |
119 | returns a BLKmode struct) and expand_call must take special action | |
120 | to make sure the object being constructed does not overlap the | |
121 | argument list for the constructor call. */ | |
122 | int stack_arg_under_construction; | |
51bbfa0c | 123 | |
d329e058 AJ |
124 | static int calls_function (tree, int); |
125 | static int calls_function_1 (tree, int); | |
126 | ||
127 | static void emit_call_1 (rtx, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, | |
128 | HOST_WIDE_INT, rtx, rtx, int, rtx, int, | |
129 | CUMULATIVE_ARGS *); | |
130 | static void precompute_register_parameters (int, struct arg_data *, int *); | |
131 | static int store_one_arg (struct arg_data *, rtx, int, int, int); | |
132 | static void store_unaligned_arguments_into_pseudos (struct arg_data *, int); | |
133 | static int finalize_must_preallocate (int, int, struct arg_data *, | |
134 | struct args_size *); | |
135 | static void precompute_arguments (int, int, struct arg_data *); | |
136 | static int compute_argument_block_size (int, struct args_size *, int); | |
137 | static void initialize_argument_information (int, struct arg_data *, | |
138 | struct args_size *, int, tree, | |
139 | tree, CUMULATIVE_ARGS *, int, | |
140 | rtx *, int *, int *, int *); | |
141 | static void compute_argument_addresses (struct arg_data *, rtx, int); | |
142 | static rtx rtx_for_function_call (tree, tree); | |
143 | static void load_register_parameters (struct arg_data *, int, rtx *, int, | |
144 | int, int *); | |
145 | static rtx emit_library_call_value_1 (int, rtx, rtx, enum libcall_type, | |
146 | enum machine_mode, int, va_list); | |
147 | static int special_function_p (tree, int); | |
148 | static rtx try_to_integrate (tree, tree, rtx, int, tree, rtx); | |
149 | static int check_sibcall_argument_overlap_1 (rtx); | |
150 | static int check_sibcall_argument_overlap (rtx, struct arg_data *, int); | |
151 | ||
152 | static int combine_pending_stack_adjustment_and_call (int, struct args_size *, | |
153 | int); | |
154 | static tree fix_unsafe_tree (tree); | |
21a3b983 | 155 | |
f73ad30e | 156 | #ifdef REG_PARM_STACK_SPACE |
d329e058 AJ |
157 | static rtx save_fixed_argument_area (int, rtx, int *, int *); |
158 | static void restore_fixed_argument_area (rtx, rtx, int, int); | |
20efdf74 | 159 | #endif |
51bbfa0c | 160 | \f |
1ce0cb53 JW |
161 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
162 | `alloca'. | |
163 | ||
164 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
165 | Actually, we only need return 1 if evaluating EXP would require pushing | |
166 | arguments on the stack, but that is too difficult to compute, so we just | |
167 | assume any function call might require the stack. */ | |
51bbfa0c | 168 | |
1c8d7aef RS |
169 | static tree calls_function_save_exprs; |
170 | ||
51bbfa0c | 171 | static int |
d329e058 | 172 | calls_function (tree exp, int which) |
1c8d7aef RS |
173 | { |
174 | int val; | |
8d5e6e25 | 175 | |
1c8d7aef RS |
176 | calls_function_save_exprs = 0; |
177 | val = calls_function_1 (exp, which); | |
178 | calls_function_save_exprs = 0; | |
179 | return val; | |
180 | } | |
181 | ||
8d5e6e25 RK |
182 | /* Recursive function to do the work of above function. */ |
183 | ||
1c8d7aef | 184 | static int |
d329e058 | 185 | calls_function_1 (tree exp, int which) |
51bbfa0c | 186 | { |
b3694847 | 187 | int i; |
0207efa2 | 188 | enum tree_code code = TREE_CODE (exp); |
8d5e6e25 RK |
189 | int class = TREE_CODE_CLASS (code); |
190 | int length = first_rtl_op (code); | |
51bbfa0c | 191 | |
ddd5a7c1 | 192 | /* If this code is language-specific, we don't know what it will do. */ |
0207efa2 RK |
193 | if ((int) code >= NUM_TREE_CODES) |
194 | return 1; | |
51bbfa0c | 195 | |
0207efa2 | 196 | switch (code) |
51bbfa0c RS |
197 | { |
198 | case CALL_EXPR: | |
1ce0cb53 JW |
199 | if (which == 0) |
200 | return 1; | |
43db0363 RK |
201 | else if ((TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
202 | == FUNCTION_TYPE) | |
203 | && (TYPE_RETURNS_STACK_DEPRESSED | |
204 | (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))))) | |
7393c642 | 205 | return 1; |
1ce0cb53 JW |
206 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR |
207 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
8d5e6e25 RK |
208 | == FUNCTION_DECL) |
209 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
210 | 0) | |
211 | & ECF_MAY_BE_ALLOCA)) | |
212 | return 1; | |
51bbfa0c | 213 | |
51bbfa0c RS |
214 | break; |
215 | ||
b367c416 RK |
216 | case CONSTRUCTOR: |
217 | { | |
218 | tree tem; | |
219 | ||
220 | for (tem = CONSTRUCTOR_ELTS (exp); tem != 0; tem = TREE_CHAIN (tem)) | |
221 | if (calls_function_1 (TREE_VALUE (tem), which)) | |
222 | return 1; | |
223 | } | |
224 | ||
225 | return 0; | |
226 | ||
51bbfa0c RS |
227 | case SAVE_EXPR: |
228 | if (SAVE_EXPR_RTL (exp) != 0) | |
229 | return 0; | |
1c8d7aef RS |
230 | if (value_member (exp, calls_function_save_exprs)) |
231 | return 0; | |
232 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, | |
233 | calls_function_save_exprs); | |
234 | return (TREE_OPERAND (exp, 0) != 0 | |
235 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); | |
51bbfa0c RS |
236 | |
237 | case BLOCK: | |
ef03bc85 | 238 | { |
b3694847 SS |
239 | tree local; |
240 | tree subblock; | |
ef03bc85 CH |
241 | |
242 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1ce0cb53 | 243 | if (DECL_INITIAL (local) != 0 |
1c8d7aef | 244 | && calls_function_1 (DECL_INITIAL (local), which)) |
ef03bc85 | 245 | return 1; |
ef03bc85 CH |
246 | |
247 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
248 | subblock; | |
249 | subblock = TREE_CHAIN (subblock)) | |
1c8d7aef | 250 | if (calls_function_1 (subblock, which)) |
ef03bc85 CH |
251 | return 1; |
252 | } | |
253 | return 0; | |
8d5e6e25 | 254 | |
0c4c16df JH |
255 | case TREE_LIST: |
256 | for (; exp != 0; exp = TREE_CHAIN (exp)) | |
257 | if (calls_function_1 (TREE_VALUE (exp), which)) | |
258 | return 1; | |
259 | return 0; | |
51bbfa0c | 260 | |
e9a25f70 JL |
261 | default: |
262 | break; | |
51bbfa0c RS |
263 | } |
264 | ||
8d5e6e25 RK |
265 | /* Only expressions, references, and blocks can contain calls. */ |
266 | if (! IS_EXPR_CODE_CLASS (class) && class != 'r' && class != 'b') | |
0c4c16df JH |
267 | return 0; |
268 | ||
51bbfa0c RS |
269 | for (i = 0; i < length; i++) |
270 | if (TREE_OPERAND (exp, i) != 0 | |
1c8d7aef | 271 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
51bbfa0c RS |
272 | return 1; |
273 | ||
274 | return 0; | |
275 | } | |
276 | \f | |
277 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
278 | and return that as an rtx. Also load the static chain register | |
279 | if FNDECL is a nested function. | |
280 | ||
77cac2f2 RK |
281 | CALL_FUSAGE points to a variable holding the prospective |
282 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 283 | |
03dacb02 | 284 | rtx |
d329e058 AJ |
285 | prepare_call_address (rtx funexp, tree fndecl, rtx *call_fusage, |
286 | int reg_parm_seen, int sibcallp) | |
51bbfa0c RS |
287 | { |
288 | rtx static_chain_value = 0; | |
289 | ||
290 | funexp = protect_from_queue (funexp, 0); | |
291 | ||
292 | if (fndecl != 0) | |
0f41302f | 293 | /* Get possible static chain value for nested function in C. */ |
51bbfa0c RS |
294 | static_chain_value = lookup_static_chain (fndecl); |
295 | ||
296 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
297 | but not for a constant address if -fno-function-cse. */ | |
298 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 299 | /* If we are using registers for parameters, force the |
e9a25f70 JL |
300 | function address into a register now. */ |
301 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
302 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
303 | : memory_address (FUNCTION_MODE, funexp)); | |
3affaf29 | 304 | else if (! sibcallp) |
51bbfa0c RS |
305 | { |
306 | #ifndef NO_FUNCTION_CSE | |
307 | if (optimize && ! flag_no_function_cse) | |
308 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
309 | if (fndecl != current_function_decl) | |
310 | #endif | |
311 | funexp = force_reg (Pmode, funexp); | |
312 | #endif | |
313 | } | |
314 | ||
315 | if (static_chain_value != 0) | |
316 | { | |
317 | emit_move_insn (static_chain_rtx, static_chain_value); | |
318 | ||
f991a240 RK |
319 | if (GET_CODE (static_chain_rtx) == REG) |
320 | use_reg (call_fusage, static_chain_rtx); | |
51bbfa0c RS |
321 | } |
322 | ||
323 | return funexp; | |
324 | } | |
325 | ||
326 | /* Generate instructions to call function FUNEXP, | |
327 | and optionally pop the results. | |
328 | The CALL_INSN is the first insn generated. | |
329 | ||
607ea900 | 330 | FNDECL is the declaration node of the function. This is given to the |
2c8da025 RK |
331 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
332 | ||
334c4f0f RK |
333 | FUNTYPE is the data type of the function. This is given to the macro |
334 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
335 | We used to allow an identifier for library functions, but that doesn't | |
336 | work when the return type is an aggregate type and the calling convention | |
337 | says that the pointer to this aggregate is to be popped by the callee. | |
51bbfa0c RS |
338 | |
339 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
340 | ROUNDED_STACK_SIZE is that number rounded up to |
341 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
342 | both to put into the call insn and to generate explicit popping | |
343 | code if necessary. | |
51bbfa0c RS |
344 | |
345 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
346 | It is zero if this call doesn't want a structure value. | |
347 | ||
348 | NEXT_ARG_REG is the rtx that results from executing | |
349 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
350 | just after all the args have had their registers assigned. | |
351 | This could be whatever you like, but normally it is the first | |
352 | arg-register beyond those used for args in this call, | |
353 | or 0 if all the arg-registers are used in this call. | |
354 | It is passed on to `gen_call' so you can put this info in the call insn. | |
355 | ||
356 | VALREG is a hard register in which a value is returned, | |
357 | or 0 if the call does not return a value. | |
358 | ||
359 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
360 | the args to this call were processed. | |
361 | We restore `inhibit_defer_pop' to that value. | |
362 | ||
94b25f81 | 363 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
6d2f8887 | 364 | denote registers used by the called function. */ |
f725a3ec | 365 | |
322e3e34 | 366 | static void |
b0a31300 | 367 | emit_call_1 (rtx funexp, tree fndecl ATTRIBUTE_UNUSED, tree funtype ATTRIBUTE_UNUSED, |
d329e058 AJ |
368 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED, |
369 | HOST_WIDE_INT rounded_stack_size, | |
370 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED, | |
371 | rtx next_arg_reg ATTRIBUTE_UNUSED, rtx valreg, | |
372 | int old_inhibit_defer_pop, rtx call_fusage, int ecf_flags, | |
373 | CUMULATIVE_ARGS *args_so_far ATTRIBUTE_UNUSED) | |
51bbfa0c | 374 | { |
062e7fd8 | 375 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
51bbfa0c RS |
376 | rtx call_insn; |
377 | int already_popped = 0; | |
fb5eebb9 | 378 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
f45c9d95 ZW |
379 | #if defined (HAVE_call) && defined (HAVE_call_value) |
380 | rtx struct_value_size_rtx; | |
381 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
382 | #endif | |
51bbfa0c | 383 | |
fa5322fa AO |
384 | #ifdef CALL_POPS_ARGS |
385 | n_popped += CALL_POPS_ARGS (* args_so_far); | |
386 | #endif | |
d329e058 | 387 | |
51bbfa0c RS |
388 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
389 | and we don't want to load it into a register as an optimization, | |
390 | because prepare_call_address already did it if it should be done. */ | |
391 | if (GET_CODE (funexp) != SYMBOL_REF) | |
392 | funexp = memory_address (FUNCTION_MODE, funexp); | |
393 | ||
0a1c58a2 JL |
394 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
395 | if ((ecf_flags & ECF_SIBCALL) | |
396 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
f132f529 | 397 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 398 | { |
8ac61af7 | 399 | rtx n_pop = GEN_INT (n_popped); |
0a1c58a2 JL |
400 | rtx pat; |
401 | ||
402 | /* If this subroutine pops its own args, record that in the call insn | |
403 | if possible, for the sake of frame pointer elimination. */ | |
404 | ||
405 | if (valreg) | |
f45c9d95 | 406 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
0a1c58a2 JL |
407 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
408 | rounded_stack_size_rtx, next_arg_reg, | |
409 | n_pop); | |
410 | else | |
f45c9d95 | 411 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
412 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
413 | ||
414 | emit_call_insn (pat); | |
415 | already_popped = 1; | |
416 | } | |
417 | else | |
418 | #endif | |
419 | ||
51bbfa0c | 420 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8ac61af7 RK |
421 | /* If the target has "call" or "call_value" insns, then prefer them |
422 | if no arguments are actually popped. If the target does not have | |
423 | "call" or "call_value" insns, then we must use the popping versions | |
424 | even if the call has no arguments to pop. */ | |
8bcafee3 JDA |
425 | #if defined (HAVE_call) && defined (HAVE_call_value) |
426 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
7393c642 | 427 | && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
8bcafee3 JDA |
428 | #else |
429 | if (HAVE_call_pop && HAVE_call_value_pop) | |
430 | #endif | |
51bbfa0c | 431 | { |
fb5eebb9 | 432 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
433 | rtx pat; |
434 | ||
435 | /* If this subroutine pops its own args, record that in the call insn | |
436 | if possible, for the sake of frame pointer elimination. */ | |
2c8da025 | 437 | |
51bbfa0c | 438 | if (valreg) |
f45c9d95 | 439 | pat = GEN_CALL_VALUE_POP (valreg, |
38a448ca | 440 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 441 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c | 442 | else |
f45c9d95 | 443 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 444 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c RS |
445 | |
446 | emit_call_insn (pat); | |
447 | already_popped = 1; | |
448 | } | |
449 | else | |
450 | #endif | |
51bbfa0c | 451 | |
0a1c58a2 JL |
452 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
453 | if ((ecf_flags & ECF_SIBCALL) | |
454 | && HAVE_sibcall && HAVE_sibcall_value) | |
455 | { | |
456 | if (valreg) | |
f45c9d95 | 457 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
0a1c58a2 JL |
458 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
459 | rounded_stack_size_rtx, | |
460 | next_arg_reg, NULL_RTX)); | |
461 | else | |
f45c9d95 | 462 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
463 | rounded_stack_size_rtx, next_arg_reg, |
464 | struct_value_size_rtx)); | |
465 | } | |
466 | else | |
467 | #endif | |
468 | ||
51bbfa0c RS |
469 | #if defined (HAVE_call) && defined (HAVE_call_value) |
470 | if (HAVE_call && HAVE_call_value) | |
471 | { | |
472 | if (valreg) | |
f45c9d95 | 473 | emit_call_insn (GEN_CALL_VALUE (valreg, |
38a448ca | 474 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 475 | rounded_stack_size_rtx, next_arg_reg, |
e992302c | 476 | NULL_RTX)); |
51bbfa0c | 477 | else |
f45c9d95 | 478 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 479 | rounded_stack_size_rtx, next_arg_reg, |
51bbfa0c RS |
480 | struct_value_size_rtx)); |
481 | } | |
482 | else | |
483 | #endif | |
484 | abort (); | |
485 | ||
ee960939 OH |
486 | /* Find the call we just emitted. */ |
487 | call_insn = last_call_insn (); | |
51bbfa0c | 488 | |
2a8f6b90 JH |
489 | /* Mark memory as used for "pure" function call. */ |
490 | if (ecf_flags & ECF_PURE) | |
8ac61af7 RK |
491 | call_fusage |
492 | = gen_rtx_EXPR_LIST | |
493 | (VOIDmode, | |
494 | gen_rtx_USE (VOIDmode, | |
495 | gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))), | |
496 | call_fusage); | |
2a8f6b90 | 497 | |
ee960939 OH |
498 | /* Put the register usage information there. */ |
499 | add_function_usage_to (call_insn, call_fusage); | |
51bbfa0c RS |
500 | |
501 | /* If this is a const call, then set the insn's unchanging bit. */ | |
2a8f6b90 | 502 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
24a28584 | 503 | CONST_OR_PURE_CALL_P (call_insn) = 1; |
51bbfa0c | 504 | |
12a22e76 JM |
505 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
506 | effect. */ | |
0a1c58a2 | 507 | if (ecf_flags & ECF_NOTHROW) |
54cea123 | 508 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
12a22e76 | 509 | REG_NOTES (call_insn)); |
b2dd096b MM |
510 | else |
511 | note_eh_region_may_contain_throw (); | |
12a22e76 | 512 | |
ca3920ad JW |
513 | if (ecf_flags & ECF_NORETURN) |
514 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx, | |
515 | REG_NOTES (call_insn)); | |
9d98f8f9 JH |
516 | if (ecf_flags & ECF_ALWAYS_RETURN) |
517 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_ALWAYS_RETURN, const0_rtx, | |
518 | REG_NOTES (call_insn)); | |
ca3920ad | 519 | |
570a98eb | 520 | if (ecf_flags & ECF_RETURNS_TWICE) |
9defc9b7 RH |
521 | { |
522 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_SETJMP, const0_rtx, | |
523 | REG_NOTES (call_insn)); | |
524 | current_function_calls_setjmp = 1; | |
525 | } | |
570a98eb | 526 | |
0a1c58a2 JL |
527 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
528 | ||
b1e64e0d RS |
529 | /* Restore this now, so that we do defer pops for this call's args |
530 | if the context of the call as a whole permits. */ | |
531 | inhibit_defer_pop = old_inhibit_defer_pop; | |
532 | ||
8af61113 RS |
533 | /* Don't bother cleaning up after a noreturn function. */ |
534 | if (ecf_flags & (ECF_NORETURN | ECF_LONGJMP)) | |
535 | return; | |
536 | ||
fb5eebb9 | 537 | if (n_popped > 0) |
51bbfa0c RS |
538 | { |
539 | if (!already_popped) | |
e3da301d | 540 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
541 | = gen_rtx_EXPR_LIST (VOIDmode, |
542 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
543 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 544 | rounded_stack_size -= n_popped; |
062e7fd8 | 545 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 546 | stack_pointer_delta -= n_popped; |
51bbfa0c RS |
547 | } |
548 | ||
f73ad30e | 549 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 550 | { |
f73ad30e JH |
551 | /* If returning from the subroutine does not automatically pop the args, |
552 | we need an instruction to pop them sooner or later. | |
553 | Perhaps do it now; perhaps just record how much space to pop later. | |
554 | ||
555 | If returning from the subroutine does pop the args, indicate that the | |
556 | stack pointer will be changed. */ | |
557 | ||
f79a65c0 | 558 | if (rounded_stack_size != 0) |
f73ad30e | 559 | { |
f79a65c0 RK |
560 | if (ecf_flags & ECF_SP_DEPRESSED) |
561 | /* Just pretend we did the pop. */ | |
562 | stack_pointer_delta -= rounded_stack_size; | |
563 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 564 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
565 | pending_stack_adjust += rounded_stack_size; |
566 | else | |
567 | adjust_stack (rounded_stack_size_rtx); | |
568 | } | |
51bbfa0c | 569 | } |
f73ad30e JH |
570 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
571 | Restore the stack pointer to its original value now. Usually | |
572 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
573 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
574 | popping variants of functions exist as well. | |
575 | ||
576 | ??? We may optimize similar to defer_pop above, but it is | |
577 | probably not worthwhile. | |
f725a3ec | 578 | |
f73ad30e JH |
579 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
580 | such machines. */ | |
581 | else if (n_popped) | |
582 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
583 | } |
584 | ||
20efdf74 JL |
585 | /* Determine if the function identified by NAME and FNDECL is one with |
586 | special properties we wish to know about. | |
587 | ||
588 | For example, if the function might return more than one time (setjmp), then | |
589 | set RETURNS_TWICE to a nonzero value. | |
590 | ||
f2d33f13 | 591 | Similarly set LONGJMP for if the function is in the longjmp family. |
20efdf74 | 592 | |
20efdf74 JL |
593 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
594 | space from the stack such as alloca. */ | |
595 | ||
f2d33f13 | 596 | static int |
d329e058 | 597 | special_function_p (tree fndecl, int flags) |
20efdf74 | 598 | { |
f2d33f13 | 599 | if (! (flags & ECF_MALLOC) |
3a8c995b | 600 | && fndecl && DECL_NAME (fndecl) |
140592a0 | 601 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
602 | /* Exclude functions not at the file scope, or not `extern', |
603 | since they are not the magic functions we would otherwise | |
d1bd0ded GK |
604 | think they are. |
605 | FIXME: this should be handled with attributes, not with this | |
606 | hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
607 | because you can declare fork() inside a function if you | |
608 | wish. */ | |
609 | && (DECL_CONTEXT (fndecl) == NULL_TREE | |
610 | || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) | |
611 | && TREE_PUBLIC (fndecl)) | |
20efdf74 | 612 | { |
63ad61ed ZW |
613 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
614 | const char *tname = name; | |
20efdf74 | 615 | |
ca54603f JL |
616 | /* We assume that alloca will always be called by name. It |
617 | makes no sense to pass it as a pointer-to-function to | |
618 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
619 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
620 | && name[0] == 'a' | |
621 | && ! strcmp (name, "alloca")) | |
622 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
623 | && name[0] == '_' | |
624 | && ! strcmp (name, "__builtin_alloca")))) | |
625 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 626 | |
20efdf74 JL |
627 | /* Disregard prefix _, __ or __x. */ |
628 | if (name[0] == '_') | |
629 | { | |
630 | if (name[1] == '_' && name[2] == 'x') | |
631 | tname += 3; | |
632 | else if (name[1] == '_') | |
633 | tname += 2; | |
634 | else | |
635 | tname += 1; | |
636 | } | |
637 | ||
638 | if (tname[0] == 's') | |
639 | { | |
f2d33f13 JH |
640 | if ((tname[1] == 'e' |
641 | && (! strcmp (tname, "setjmp") | |
642 | || ! strcmp (tname, "setjmp_syscall"))) | |
643 | || (tname[1] == 'i' | |
644 | && ! strcmp (tname, "sigsetjmp")) | |
645 | || (tname[1] == 'a' | |
646 | && ! strcmp (tname, "savectx"))) | |
647 | flags |= ECF_RETURNS_TWICE; | |
648 | ||
20efdf74 JL |
649 | if (tname[1] == 'i' |
650 | && ! strcmp (tname, "siglongjmp")) | |
f2d33f13 | 651 | flags |= ECF_LONGJMP; |
20efdf74 JL |
652 | } |
653 | else if ((tname[0] == 'q' && tname[1] == 's' | |
654 | && ! strcmp (tname, "qsetjmp")) | |
655 | || (tname[0] == 'v' && tname[1] == 'f' | |
656 | && ! strcmp (tname, "vfork"))) | |
f2d33f13 | 657 | flags |= ECF_RETURNS_TWICE; |
20efdf74 JL |
658 | |
659 | else if (tname[0] == 'l' && tname[1] == 'o' | |
660 | && ! strcmp (tname, "longjmp")) | |
f2d33f13 | 661 | flags |= ECF_LONGJMP; |
fa76d9e0 JR |
662 | |
663 | else if ((tname[0] == 'f' && tname[1] == 'o' | |
664 | && ! strcmp (tname, "fork")) | |
665 | /* Linux specific: __clone. check NAME to insist on the | |
666 | leading underscores, to avoid polluting the ISO / POSIX | |
667 | namespace. */ | |
668 | || (name[0] == '_' && name[1] == '_' | |
669 | && ! strcmp (tname, "clone")) | |
670 | || (tname[0] == 'e' && tname[1] == 'x' && tname[2] == 'e' | |
671 | && tname[3] == 'c' && (tname[4] == 'l' || tname[4] == 'v') | |
672 | && (tname[5] == '\0' | |
673 | || ((tname[5] == 'p' || tname[5] == 'e') | |
674 | && tname[6] == '\0')))) | |
f2d33f13 | 675 | flags |= ECF_FORK_OR_EXEC; |
20efdf74 | 676 | } |
f2d33f13 | 677 | return flags; |
20efdf74 JL |
678 | } |
679 | ||
f2d33f13 | 680 | /* Return nonzero when tree represent call to longjmp. */ |
7393c642 | 681 | |
f2d33f13 | 682 | int |
d329e058 | 683 | setjmp_call_p (tree fndecl) |
f2d33f13 JH |
684 | { |
685 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
686 | } | |
687 | ||
c986baf6 JH |
688 | /* Return true when exp contains alloca call. */ |
689 | bool | |
d329e058 | 690 | alloca_call_p (tree exp) |
c986baf6 JH |
691 | { |
692 | if (TREE_CODE (exp) == CALL_EXPR | |
693 | && TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
694 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
695 | == FUNCTION_DECL) | |
696 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
697 | 0) & ECF_MAY_BE_ALLOCA)) | |
698 | return true; | |
699 | return false; | |
700 | } | |
701 | ||
b5cd4ed4 | 702 | /* Detect flags (function attributes) from the function decl or type node. */ |
7393c642 | 703 | |
4977bab6 | 704 | int |
d329e058 | 705 | flags_from_decl_or_type (tree exp) |
f2d33f13 JH |
706 | { |
707 | int flags = 0; | |
b5cd4ed4 | 708 | tree type = exp; |
36dbb93d | 709 | |
f2d33f13 JH |
710 | if (DECL_P (exp)) |
711 | { | |
b255a036 | 712 | struct cgraph_rtl_info *i = cgraph_rtl_info (exp); |
b5cd4ed4 RK |
713 | type = TREE_TYPE (exp); |
714 | ||
36dbb93d RS |
715 | if (i) |
716 | { | |
717 | if (i->pure_function) | |
718 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; | |
719 | if (i->const_function) | |
720 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; | |
721 | } | |
b255a036 | 722 | |
f2d33f13 | 723 | /* The function exp may have the `malloc' attribute. */ |
36dbb93d | 724 | if (DECL_IS_MALLOC (exp)) |
f2d33f13 JH |
725 | flags |= ECF_MALLOC; |
726 | ||
2a8f6b90 | 727 | /* The function exp may have the `pure' attribute. */ |
36dbb93d | 728 | if (DECL_IS_PURE (exp)) |
53d4257f | 729 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
2a8f6b90 | 730 | |
f2d33f13 JH |
731 | if (TREE_NOTHROW (exp)) |
732 | flags |= ECF_NOTHROW; | |
733 | } | |
734 | ||
7393c642 | 735 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
53d4257f | 736 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
f2d33f13 JH |
737 | |
738 | if (TREE_THIS_VOLATILE (exp)) | |
739 | flags |= ECF_NORETURN; | |
740 | ||
b5cd4ed4 RK |
741 | /* Mark if the function returns with the stack pointer depressed. We |
742 | cannot consider it pure or constant in that case. */ | |
743 | if (TREE_CODE (type) == FUNCTION_TYPE && TYPE_RETURNS_STACK_DEPRESSED (type)) | |
744 | { | |
745 | flags |= ECF_SP_DEPRESSED; | |
53d4257f | 746 | flags &= ~(ECF_PURE | ECF_CONST | ECF_LIBCALL_BLOCK); |
b5cd4ed4 RK |
747 | } |
748 | ||
f2d33f13 JH |
749 | return flags; |
750 | } | |
751 | ||
20efdf74 JL |
752 | /* Precompute all register parameters as described by ARGS, storing values |
753 | into fields within the ARGS array. | |
754 | ||
755 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
756 | ||
757 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
758 | ||
759 | static void | |
d329e058 | 760 | precompute_register_parameters (int num_actuals, struct arg_data *args, int *reg_parm_seen) |
20efdf74 JL |
761 | { |
762 | int i; | |
763 | ||
764 | *reg_parm_seen = 0; | |
765 | ||
766 | for (i = 0; i < num_actuals; i++) | |
767 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
768 | { | |
769 | *reg_parm_seen = 1; | |
770 | ||
771 | if (args[i].value == 0) | |
772 | { | |
773 | push_temp_slots (); | |
774 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, | |
775 | VOIDmode, 0); | |
776 | preserve_temp_slots (args[i].value); | |
777 | pop_temp_slots (); | |
778 | ||
779 | /* ANSI doesn't require a sequence point here, | |
780 | but PCC has one, so this will avoid some problems. */ | |
781 | emit_queue (); | |
782 | } | |
783 | ||
fd1e5d25 RH |
784 | /* If the value is a non-legitimate constant, force it into a |
785 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
786 | if (CONSTANT_P (args[i].value) | |
787 | && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
788 | args[i].value = force_reg (args[i].mode, args[i].value); | |
789 | ||
20efdf74 JL |
790 | /* If we are to promote the function arg to a wider mode, |
791 | do it now. */ | |
792 | ||
793 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
794 | args[i].value | |
795 | = convert_modes (args[i].mode, | |
796 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
797 | args[i].value, args[i].unsignedp); | |
798 | ||
f725a3ec | 799 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
800 | short loop, put the value into a pseudo and then put the pseudo |
801 | into the hard reg. | |
802 | ||
803 | For small register classes, also do this if this call uses | |
804 | register parameters. This is to avoid reload conflicts while | |
805 | loading the parameters registers. */ | |
806 | ||
807 | if ((! (GET_CODE (args[i].value) == REG | |
808 | || (GET_CODE (args[i].value) == SUBREG | |
809 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) | |
810 | && args[i].mode != BLKmode | |
b437f1a7 | 811 | && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1) |
20efdf74 JL |
812 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) |
813 | || preserve_subexpressions_p ())) | |
814 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
815 | } | |
816 | } | |
817 | ||
f73ad30e | 818 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
819 | |
820 | /* The argument list is the property of the called routine and it | |
821 | may clobber it. If the fixed area has been used for previous | |
822 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 823 | |
20efdf74 | 824 | static rtx |
d329e058 | 825 | save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) |
20efdf74 | 826 | { |
b820d2b8 AM |
827 | int low; |
828 | int high; | |
20efdf74 | 829 | |
b820d2b8 AM |
830 | /* Compute the boundary of the area that needs to be saved, if any. */ |
831 | high = reg_parm_stack_space; | |
20efdf74 | 832 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 833 | high += 1; |
20efdf74 | 834 | #endif |
b820d2b8 AM |
835 | if (high > highest_outgoing_arg_in_use) |
836 | high = highest_outgoing_arg_in_use; | |
20efdf74 | 837 | |
b820d2b8 AM |
838 | for (low = 0; low < high; low++) |
839 | if (stack_usage_map[low] != 0) | |
840 | { | |
841 | int num_to_save; | |
842 | enum machine_mode save_mode; | |
843 | int delta; | |
844 | rtx stack_area; | |
845 | rtx save_area; | |
20efdf74 | 846 | |
b820d2b8 AM |
847 | while (stack_usage_map[--high] == 0) |
848 | ; | |
20efdf74 | 849 | |
b820d2b8 AM |
850 | *low_to_save = low; |
851 | *high_to_save = high; | |
852 | ||
853 | num_to_save = high - low + 1; | |
854 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
20efdf74 | 855 | |
b820d2b8 AM |
856 | /* If we don't have the required alignment, must do this |
857 | in BLKmode. */ | |
858 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
859 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
860 | save_mode = BLKmode; | |
20efdf74 JL |
861 | |
862 | #ifdef ARGS_GROW_DOWNWARD | |
b820d2b8 | 863 | delta = -high; |
20efdf74 | 864 | #else |
b820d2b8 | 865 | delta = low; |
20efdf74 | 866 | #endif |
b820d2b8 AM |
867 | stack_area = gen_rtx_MEM (save_mode, |
868 | memory_address (save_mode, | |
869 | plus_constant (argblock, | |
870 | delta))); | |
8ac61af7 | 871 | |
b820d2b8 AM |
872 | set_mem_align (stack_area, PARM_BOUNDARY); |
873 | if (save_mode == BLKmode) | |
874 | { | |
875 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
876 | emit_block_move (validize_mem (save_area), stack_area, | |
877 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
878 | } | |
879 | else | |
880 | { | |
881 | save_area = gen_reg_rtx (save_mode); | |
882 | emit_move_insn (save_area, stack_area); | |
883 | } | |
8ac61af7 | 884 | |
b820d2b8 AM |
885 | return save_area; |
886 | } | |
887 | ||
888 | return NULL_RTX; | |
20efdf74 JL |
889 | } |
890 | ||
891 | static void | |
d329e058 | 892 | restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) |
20efdf74 JL |
893 | { |
894 | enum machine_mode save_mode = GET_MODE (save_area); | |
b820d2b8 AM |
895 | int delta; |
896 | rtx stack_area; | |
897 | ||
20efdf74 | 898 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 899 | delta = -high_to_save; |
20efdf74 | 900 | #else |
b820d2b8 | 901 | delta = low_to_save; |
20efdf74 | 902 | #endif |
b820d2b8 AM |
903 | stack_area = gen_rtx_MEM (save_mode, |
904 | memory_address (save_mode, | |
905 | plus_constant (argblock, delta))); | |
906 | set_mem_align (stack_area, PARM_BOUNDARY); | |
20efdf74 JL |
907 | |
908 | if (save_mode != BLKmode) | |
909 | emit_move_insn (stack_area, save_area); | |
910 | else | |
44bb111a RH |
911 | emit_block_move (stack_area, validize_mem (save_area), |
912 | GEN_INT (high_to_save - low_to_save + 1), | |
913 | BLOCK_OP_CALL_PARM); | |
20efdf74 | 914 | } |
19652adf | 915 | #endif /* REG_PARM_STACK_SPACE */ |
f725a3ec | 916 | |
20efdf74 JL |
917 | /* If any elements in ARGS refer to parameters that are to be passed in |
918 | registers, but not in memory, and whose alignment does not permit a | |
919 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 920 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
921 | |
922 | Pseudos for each unaligned argument will be stored into the array | |
923 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
924 | the aligned_regs array if it is nonzero. */ | |
925 | ||
20efdf74 | 926 | static void |
d329e058 | 927 | store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) |
20efdf74 JL |
928 | { |
929 | int i, j; | |
f725a3ec | 930 | |
20efdf74 JL |
931 | for (i = 0; i < num_actuals; i++) |
932 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
933 | && args[i].mode == BLKmode | |
934 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
935 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
936 | { | |
937 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
6e985040 AM |
938 | int nregs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; |
939 | int endian_correction = 0; | |
20efdf74 | 940 | |
6e985040 | 941 | args[i].n_aligned_regs = args[i].partial ? args[i].partial : nregs; |
8e6a59fe MM |
942 | args[i].aligned_regs = (rtx *) xmalloc (sizeof (rtx) |
943 | * args[i].n_aligned_regs); | |
20efdf74 | 944 | |
6e985040 AM |
945 | /* Structures smaller than a word are normally aligned to the |
946 | least significant byte. On a BYTES_BIG_ENDIAN machine, | |
20efdf74 JL |
947 | this means we must skip the empty high order bytes when |
948 | calculating the bit offset. */ | |
6e985040 AM |
949 | if (bytes < UNITS_PER_WORD |
950 | #ifdef BLOCK_REG_PADDING | |
951 | && (BLOCK_REG_PADDING (args[i].mode, | |
952 | TREE_TYPE (args[i].tree_value), 1) | |
953 | == downward) | |
954 | #else | |
955 | && BYTES_BIG_ENDIAN | |
956 | #endif | |
957 | ) | |
958 | endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
20efdf74 JL |
959 | |
960 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
961 | { | |
962 | rtx reg = gen_reg_rtx (word_mode); | |
963 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
964 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
20efdf74 JL |
965 | |
966 | args[i].aligned_regs[j] = reg; | |
6e985040 AM |
967 | word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
968 | word_mode, word_mode, BITS_PER_WORD); | |
20efdf74 JL |
969 | |
970 | /* There is no need to restrict this code to loading items | |
971 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
972 | load up entire word sized registers efficiently. | |
973 | ||
974 | ??? This may not be needed anymore. | |
975 | We use to emit a clobber here but that doesn't let later | |
976 | passes optimize the instructions we emit. By storing 0 into | |
977 | the register later passes know the first AND to zero out the | |
978 | bitfield being set in the register is unnecessary. The store | |
979 | of 0 will be deleted as will at least the first AND. */ | |
980 | ||
981 | emit_move_insn (reg, const0_rtx); | |
982 | ||
983 | bytes -= bitsize / BITS_PER_UNIT; | |
6e985040 AM |
984 | store_bit_field (reg, bitsize, endian_correction, word_mode, |
985 | word, BITS_PER_WORD); | |
20efdf74 JL |
986 | } |
987 | } | |
988 | } | |
989 | ||
d7cdf113 | 990 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
f725a3ec | 991 | ACTPARMS. |
d7cdf113 JL |
992 | |
993 | NUM_ACTUALS is the total number of parameters. | |
994 | ||
995 | N_NAMED_ARGS is the total number of named arguments. | |
996 | ||
997 | FNDECL is the tree code for the target of this call (if known) | |
998 | ||
999 | ARGS_SO_FAR holds state needed by the target to know where to place | |
1000 | the next argument. | |
1001 | ||
1002 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
1003 | for arguments which are passed in registers. | |
1004 | ||
1005 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
1006 | and may be modified by this routine. | |
1007 | ||
f2d33f13 | 1008 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
d7cdf113 JL |
1009 | flags which may may be modified by this routine. */ |
1010 | ||
1011 | static void | |
d329e058 AJ |
1012 | initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, |
1013 | struct arg_data *args, | |
1014 | struct args_size *args_size, | |
1015 | int n_named_args ATTRIBUTE_UNUSED, | |
1016 | tree actparms, tree fndecl, | |
1017 | CUMULATIVE_ARGS *args_so_far, | |
1018 | int reg_parm_stack_space, | |
1019 | rtx *old_stack_level, int *old_pending_adj, | |
1020 | int *must_preallocate, int *ecf_flags) | |
d7cdf113 JL |
1021 | { |
1022 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
1023 | int inc; | |
1024 | ||
1025 | /* Count arg position in order args appear. */ | |
1026 | int argpos; | |
1027 | ||
1028 | int i; | |
1029 | tree p; | |
f725a3ec | 1030 | |
d7cdf113 JL |
1031 | args_size->constant = 0; |
1032 | args_size->var = 0; | |
1033 | ||
1034 | /* In this loop, we consider args in the order they are written. | |
1035 | We fill up ARGS from the front or from the back if necessary | |
1036 | so that in any case the first arg to be pushed ends up at the front. */ | |
1037 | ||
f73ad30e JH |
1038 | if (PUSH_ARGS_REVERSED) |
1039 | { | |
1040 | i = num_actuals - 1, inc = -1; | |
1041 | /* In this case, must reverse order of args | |
1042 | so that we compute and push the last arg first. */ | |
1043 | } | |
1044 | else | |
1045 | { | |
1046 | i = 0, inc = 1; | |
1047 | } | |
d7cdf113 JL |
1048 | |
1049 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
1050 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
1051 | { | |
1052 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
1053 | int unsignedp; | |
1054 | enum machine_mode mode; | |
1055 | ||
1056 | args[i].tree_value = TREE_VALUE (p); | |
1057 | ||
1058 | /* Replace erroneous argument with constant zero. */ | |
d0f062fb | 1059 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1060 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1061 | ||
1062 | /* If TYPE is a transparent union, pass things the way we would | |
1063 | pass the first field of the union. We have already verified that | |
1064 | the modes are the same. */ | |
2bf105ab | 1065 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
d7cdf113 JL |
1066 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1067 | ||
1068 | /* Decide where to pass this arg. | |
1069 | ||
1070 | args[i].reg is nonzero if all or part is passed in registers. | |
1071 | ||
1072 | args[i].partial is nonzero if part but not all is passed in registers, | |
1073 | and the exact value says how many words are passed in registers. | |
1074 | ||
1075 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1076 | computed on the stack. It may then be loaded back into registers | |
1077 | if args[i].reg is nonzero. | |
1078 | ||
1079 | These decisions are driven by the FUNCTION_... macros and must agree | |
1080 | with those made by function.c. */ | |
1081 | ||
1082 | /* See if this argument should be passed by invisible reference. */ | |
7a6cdb44 | 1083 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type)) |
d7cdf113 JL |
1084 | || TREE_ADDRESSABLE (type) |
1085 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
959f3a06 | 1086 | || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1087 | type, argpos < n_named_args) |
1088 | #endif | |
1089 | ) | |
1090 | { | |
1091 | /* If we're compiling a thunk, pass through invisible | |
1092 | references instead of making a copy. */ | |
1093 | if (current_function_is_thunk | |
1094 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
959f3a06 | 1095 | || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1096 | type, argpos < n_named_args) |
1097 | /* If it's in a register, we must make a copy of it too. */ | |
1098 | /* ??? Is this a sufficient test? Is there a better one? */ | |
1099 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
1100 | && REG_P (DECL_RTL (args[i].tree_value))) | |
1101 | && ! TREE_ADDRESSABLE (type)) | |
1102 | #endif | |
1103 | ) | |
1104 | { | |
1105 | /* C++ uses a TARGET_EXPR to indicate that we want to make a | |
1106 | new object from the argument. If we are passing by | |
1107 | invisible reference, the callee will do that for us, so we | |
1108 | can strip off the TARGET_EXPR. This is not always safe, | |
1109 | but it is safe in the only case where this is a useful | |
1110 | optimization; namely, when the argument is a plain object. | |
1111 | In that case, the frontend is just asking the backend to | |
f725a3ec KH |
1112 | make a bitwise copy of the argument. */ |
1113 | ||
d7cdf113 | 1114 | if (TREE_CODE (args[i].tree_value) == TARGET_EXPR |
2f939d94 | 1115 | && (DECL_P (TREE_OPERAND (args[i].tree_value, 1))) |
d7cdf113 JL |
1116 | && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1)))) |
1117 | args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1); | |
1118 | ||
1119 | args[i].tree_value = build1 (ADDR_EXPR, | |
1120 | build_pointer_type (type), | |
1121 | args[i].tree_value); | |
1122 | type = build_pointer_type (type); | |
1123 | } | |
f21add07 JM |
1124 | else if (TREE_CODE (args[i].tree_value) == TARGET_EXPR) |
1125 | { | |
1126 | /* In the V3 C++ ABI, parameters are destroyed in the caller. | |
1127 | We implement this by passing the address of the temporary | |
1128 | rather than expanding it into another allocated slot. */ | |
1129 | args[i].tree_value = build1 (ADDR_EXPR, | |
1130 | build_pointer_type (type), | |
1131 | args[i].tree_value); | |
1132 | type = build_pointer_type (type); | |
1133 | } | |
d7cdf113 JL |
1134 | else |
1135 | { | |
1136 | /* We make a copy of the object and pass the address to the | |
1137 | function being called. */ | |
1138 | rtx copy; | |
1139 | ||
d0f062fb | 1140 | if (!COMPLETE_TYPE_P (type) |
d7cdf113 JL |
1141 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1142 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
05bccae2 RK |
1143 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1144 | STACK_CHECK_MAX_VAR_SIZE)))) | |
d7cdf113 JL |
1145 | { |
1146 | /* This is a variable-sized object. Make space on the stack | |
1147 | for it. */ | |
1148 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1149 | ||
1150 | if (*old_stack_level == 0) | |
1151 | { | |
1152 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1153 | *old_pending_adj = pending_stack_adjust; | |
1154 | pending_stack_adjust = 0; | |
1155 | } | |
1156 | ||
1157 | copy = gen_rtx_MEM (BLKmode, | |
3bdf5ad1 RK |
1158 | allocate_dynamic_stack_space |
1159 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1160 | set_mem_attributes (copy, type, 1); | |
d7cdf113 JL |
1161 | } |
1162 | else | |
3bdf5ad1 | 1163 | copy = assign_temp (type, 0, 1, 0); |
d7cdf113 JL |
1164 | |
1165 | store_expr (args[i].tree_value, copy, 0); | |
53d4257f | 1166 | *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
d7cdf113 JL |
1167 | |
1168 | args[i].tree_value = build1 (ADDR_EXPR, | |
1169 | build_pointer_type (type), | |
1170 | make_tree (type, copy)); | |
1171 | type = build_pointer_type (type); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | mode = TYPE_MODE (type); | |
1176 | unsignedp = TREE_UNSIGNED (type); | |
1177 | ||
1178 | #ifdef PROMOTE_FUNCTION_ARGS | |
1179 | mode = promote_mode (type, mode, &unsignedp, 1); | |
1180 | #endif | |
1181 | ||
1182 | args[i].unsignedp = unsignedp; | |
1183 | args[i].mode = mode; | |
7d167afd | 1184 | |
099e9712 JH |
1185 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1186 | argpos < n_named_args); | |
7d167afd JJ |
1187 | #ifdef FUNCTION_INCOMING_ARG |
1188 | /* If this is a sibling call and the machine has register windows, the | |
1189 | register window has to be unwinded before calling the routine, so | |
1190 | arguments have to go into the incoming registers. */ | |
099e9712 | 1191 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
f725a3ec | 1192 | argpos < n_named_args); |
099e9712 JH |
1193 | #else |
1194 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1195 | #endif |
7d167afd | 1196 | |
d7cdf113 JL |
1197 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
1198 | if (args[i].reg) | |
1199 | args[i].partial | |
959f3a06 | 1200 | = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type, |
d7cdf113 JL |
1201 | argpos < n_named_args); |
1202 | #endif | |
1203 | ||
1204 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); | |
1205 | ||
1206 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1207 | it means that we are to pass this arg in the register(s) designated | |
1208 | by the PARALLEL, but also to pass it in the stack. */ | |
1209 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1210 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1211 | args[i].pass_on_stack = 1; | |
1212 | ||
1213 | /* If this is an addressable type, we must preallocate the stack | |
1214 | since we must evaluate the object into its final location. | |
1215 | ||
1216 | If this is to be passed in both registers and the stack, it is simpler | |
1217 | to preallocate. */ | |
1218 | if (TREE_ADDRESSABLE (type) | |
1219 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1220 | *must_preallocate = 1; | |
1221 | ||
1222 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1223 | we cannot consider this function call constant. */ | |
1224 | if (TREE_ADDRESSABLE (type)) | |
53d4257f | 1225 | *ecf_flags &= ~ECF_LIBCALL_BLOCK; |
d7cdf113 JL |
1226 | |
1227 | /* Compute the stack-size of this argument. */ | |
1228 | if (args[i].reg == 0 || args[i].partial != 0 | |
1229 | || reg_parm_stack_space > 0 | |
1230 | || args[i].pass_on_stack) | |
1231 | locate_and_pad_parm (mode, type, | |
1232 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1233 | 1, | |
1234 | #else | |
1235 | args[i].reg != 0, | |
1236 | #endif | |
e7949876 AM |
1237 | args[i].pass_on_stack ? 0 : args[i].partial, |
1238 | fndecl, args_size, &args[i].locate); | |
f725a3ec | 1239 | |
d7cdf113 JL |
1240 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1241 | ||
e7949876 AM |
1242 | args_size->constant += args[i].locate.size.constant; |
1243 | if (args[i].locate.size.var) | |
1244 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
d7cdf113 JL |
1245 | |
1246 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1247 | have been used, etc. */ | |
1248 | ||
959f3a06 | 1249 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
d7cdf113 JL |
1250 | argpos < n_named_args); |
1251 | } | |
1252 | } | |
1253 | ||
599f37b6 JL |
1254 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1255 | Return the original constant component of the argument block's size. | |
1256 | ||
1257 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1258 | for arguments passed in registers. */ | |
1259 | ||
1260 | static int | |
d329e058 AJ |
1261 | compute_argument_block_size (int reg_parm_stack_space, |
1262 | struct args_size *args_size, | |
1263 | int preferred_stack_boundary ATTRIBUTE_UNUSED) | |
599f37b6 JL |
1264 | { |
1265 | int unadjusted_args_size = args_size->constant; | |
1266 | ||
f73ad30e JH |
1267 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1268 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
f5143c46 | 1269 | backends from generating misaligned frame sizes. */ |
f73ad30e JH |
1270 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1271 | preferred_stack_boundary = STACK_BOUNDARY; | |
f73ad30e | 1272 | |
599f37b6 JL |
1273 | /* Compute the actual size of the argument block required. The variable |
1274 | and constant sizes must be combined, the size may have to be rounded, | |
1275 | and there may be a minimum required size. */ | |
1276 | ||
1277 | if (args_size->var) | |
1278 | { | |
1279 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1280 | args_size->constant = 0; | |
1281 | ||
c2f8b491 JH |
1282 | preferred_stack_boundary /= BITS_PER_UNIT; |
1283 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1284 | { |
1285 | /* We don't handle this case yet. To handle it correctly we have | |
f5143c46 | 1286 | to add the delta, round and subtract the delta. |
1503a7ec JH |
1287 | Currently no machine description requires this support. */ |
1288 | if (stack_pointer_delta & (preferred_stack_boundary - 1)) | |
f725a3ec | 1289 | abort (); |
1503a7ec JH |
1290 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1291 | } | |
599f37b6 JL |
1292 | |
1293 | if (reg_parm_stack_space > 0) | |
1294 | { | |
1295 | args_size->var | |
1296 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1297 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1298 | |
1299 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1300 | /* The area corresponding to register parameters is not to count in | |
1301 | the size of the block we need. So make the adjustment. */ | |
1302 | args_size->var | |
1303 | = size_binop (MINUS_EXPR, args_size->var, | |
fed3cef0 | 1304 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1305 | #endif |
1306 | } | |
1307 | } | |
1308 | else | |
1309 | { | |
c2f8b491 | 1310 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1311 | if (preferred_stack_boundary < 1) |
1312 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1313 | args_size->constant = (((args_size->constant |
1503a7ec | 1314 | + stack_pointer_delta |
c2f8b491 JH |
1315 | + preferred_stack_boundary - 1) |
1316 | / preferred_stack_boundary | |
1317 | * preferred_stack_boundary) | |
1503a7ec | 1318 | - stack_pointer_delta); |
599f37b6 JL |
1319 | |
1320 | args_size->constant = MAX (args_size->constant, | |
1321 | reg_parm_stack_space); | |
1322 | ||
1323 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1324 | if (reg_parm_stack_space == 0) | |
1325 | args_size->constant = 0; | |
1326 | #endif | |
1327 | ||
1328 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1329 | args_size->constant -= reg_parm_stack_space; | |
1330 | #endif | |
1331 | } | |
1332 | return unadjusted_args_size; | |
1333 | } | |
1334 | ||
19832c77 | 1335 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1336 | |
f2d33f13 | 1337 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1338 | |
cc0b1adc JL |
1339 | NUM_ACTUALS is the number of arguments. |
1340 | ||
f725a3ec KH |
1341 | ARGS is an array containing information for each argument; this |
1342 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1343 | precomputed argument. */ | |
cc0b1adc JL |
1344 | |
1345 | static void | |
d329e058 | 1346 | precompute_arguments (int flags, int num_actuals, struct arg_data *args) |
cc0b1adc JL |
1347 | { |
1348 | int i; | |
1349 | ||
1350 | /* If this function call is cse'able, precompute all the parameters. | |
1351 | Note that if the parameter is constructed into a temporary, this will | |
1352 | cause an additional copy because the parameter will be constructed | |
1353 | into a temporary location and then copied into the outgoing arguments. | |
1354 | If a parameter contains a call to alloca and this function uses the | |
1355 | stack, precompute the parameter. */ | |
1356 | ||
1357 | /* If we preallocated the stack space, and some arguments must be passed | |
1358 | on the stack, then we must precompute any parameter which contains a | |
1359 | function call which will store arguments on the stack. | |
1360 | Otherwise, evaluating the parameter may clobber previous parameters | |
40d6e956 | 1361 | which have already been stored into the stack. (we have code to avoid |
f5143c46 | 1362 | such case by saving the outgoing stack arguments, but it results in |
40d6e956 | 1363 | worse code) */ |
cc0b1adc JL |
1364 | |
1365 | for (i = 0; i < num_actuals; i++) | |
53d4257f | 1366 | if ((flags & ECF_LIBCALL_BLOCK) |
40d6e956 | 1367 | || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS)) |
cc0b1adc | 1368 | { |
ddef6bc7 JJ |
1369 | enum machine_mode mode; |
1370 | ||
cc0b1adc JL |
1371 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
1372 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) | |
1373 | abort (); | |
1374 | ||
47841d1b | 1375 | args[i].value |
cc0b1adc JL |
1376 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1377 | ||
cc0b1adc JL |
1378 | /* ANSI doesn't require a sequence point here, |
1379 | but PCC has one, so this will avoid some problems. */ | |
1380 | emit_queue (); | |
1381 | ||
1382 | args[i].initial_value = args[i].value | |
47841d1b | 1383 | = protect_from_queue (args[i].value, 0); |
cc0b1adc | 1384 | |
ddef6bc7 JJ |
1385 | mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); |
1386 | if (mode != args[i].mode) | |
47841d1b JJ |
1387 | { |
1388 | args[i].value | |
ddef6bc7 | 1389 | = convert_modes (args[i].mode, mode, |
47841d1b JJ |
1390 | args[i].value, args[i].unsignedp); |
1391 | #ifdef PROMOTE_FOR_CALL_ONLY | |
1392 | /* CSE will replace this only if it contains args[i].value | |
1393 | pseudo, so convert it down to the declared mode using | |
1394 | a SUBREG. */ | |
1395 | if (GET_CODE (args[i].value) == REG | |
1396 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1397 | { | |
1398 | args[i].initial_value | |
ddef6bc7 | 1399 | = gen_lowpart_SUBREG (mode, args[i].value); |
47841d1b | 1400 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; |
7879b81e SE |
1401 | SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, |
1402 | args[i].unsignedp); | |
47841d1b JJ |
1403 | } |
1404 | #endif | |
1405 | } | |
cc0b1adc JL |
1406 | } |
1407 | } | |
1408 | ||
0f9b3ea6 JL |
1409 | /* Given the current state of MUST_PREALLOCATE and information about |
1410 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1411 | compute and return the final value for MUST_PREALLOCATE. */ | |
1412 | ||
1413 | static int | |
d329e058 | 1414 | finalize_must_preallocate (int must_preallocate, int num_actuals, struct arg_data *args, struct args_size *args_size) |
0f9b3ea6 JL |
1415 | { |
1416 | /* See if we have or want to preallocate stack space. | |
1417 | ||
1418 | If we would have to push a partially-in-regs parm | |
1419 | before other stack parms, preallocate stack space instead. | |
1420 | ||
1421 | If the size of some parm is not a multiple of the required stack | |
1422 | alignment, we must preallocate. | |
1423 | ||
1424 | If the total size of arguments that would otherwise create a copy in | |
1425 | a temporary (such as a CALL) is more than half the total argument list | |
1426 | size, preallocation is faster. | |
1427 | ||
1428 | Another reason to preallocate is if we have a machine (like the m88k) | |
1429 | where stack alignment is required to be maintained between every | |
1430 | pair of insns, not just when the call is made. However, we assume here | |
1431 | that such machines either do not have push insns (and hence preallocation | |
1432 | would occur anyway) or the problem is taken care of with | |
1433 | PUSH_ROUNDING. */ | |
1434 | ||
1435 | if (! must_preallocate) | |
1436 | { | |
1437 | int partial_seen = 0; | |
1438 | int copy_to_evaluate_size = 0; | |
1439 | int i; | |
1440 | ||
1441 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1442 | { | |
1443 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1444 | partial_seen = 1; | |
1445 | else if (partial_seen && args[i].reg == 0) | |
1446 | must_preallocate = 1; | |
1447 | ||
1448 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1449 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1450 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1451 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1452 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1453 | copy_to_evaluate_size | |
1454 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1455 | } | |
1456 | ||
1457 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1458 | && args_size->constant > 0) | |
1459 | must_preallocate = 1; | |
1460 | } | |
1461 | return must_preallocate; | |
1462 | } | |
599f37b6 | 1463 | |
a45bdd02 JL |
1464 | /* If we preallocated stack space, compute the address of each argument |
1465 | and store it into the ARGS array. | |
1466 | ||
f725a3ec | 1467 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1468 | validized when it is used. |
1469 | ||
1470 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1471 | ||
1472 | static void | |
d329e058 | 1473 | compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) |
a45bdd02 JL |
1474 | { |
1475 | if (argblock) | |
1476 | { | |
1477 | rtx arg_reg = argblock; | |
1478 | int i, arg_offset = 0; | |
1479 | ||
1480 | if (GET_CODE (argblock) == PLUS) | |
1481 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1482 | ||
1483 | for (i = 0; i < num_actuals; i++) | |
1484 | { | |
e7949876 AM |
1485 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1486 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
a45bdd02 JL |
1487 | rtx addr; |
1488 | ||
1489 | /* Skip this parm if it will not be passed on the stack. */ | |
1490 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1491 | continue; | |
1492 | ||
1493 | if (GET_CODE (offset) == CONST_INT) | |
1494 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1495 | else | |
1496 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1497 | ||
1498 | addr = plus_constant (addr, arg_offset); | |
1499 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
d1a74aa7 | 1500 | set_mem_align (args[i].stack, PARM_BOUNDARY); |
3bdf5ad1 RK |
1501 | set_mem_attributes (args[i].stack, |
1502 | TREE_TYPE (args[i].tree_value), 1); | |
a45bdd02 JL |
1503 | |
1504 | if (GET_CODE (slot_offset) == CONST_INT) | |
1505 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1506 | else | |
1507 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1508 | ||
1509 | addr = plus_constant (addr, arg_offset); | |
1510 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
d1a74aa7 | 1511 | set_mem_align (args[i].stack_slot, PARM_BOUNDARY); |
3bdf5ad1 RK |
1512 | set_mem_attributes (args[i].stack_slot, |
1513 | TREE_TYPE (args[i].tree_value), 1); | |
7ab923cc JJ |
1514 | |
1515 | /* Function incoming arguments may overlap with sibling call | |
1516 | outgoing arguments and we cannot allow reordering of reads | |
1517 | from function arguments with stores to outgoing arguments | |
1518 | of sibling calls. */ | |
ba4828e0 RK |
1519 | set_mem_alias_set (args[i].stack, 0); |
1520 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1521 | } |
1522 | } | |
1523 | } | |
f725a3ec | 1524 | |
a45bdd02 JL |
1525 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1526 | in a call instruction. | |
1527 | ||
1528 | FNDECL is the tree node for the target function. For an indirect call | |
1529 | FNDECL will be NULL_TREE. | |
1530 | ||
09e2bf48 | 1531 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
a45bdd02 JL |
1532 | |
1533 | static rtx | |
d329e058 | 1534 | rtx_for_function_call (tree fndecl, tree addr) |
a45bdd02 JL |
1535 | { |
1536 | rtx funexp; | |
1537 | ||
1538 | /* Get the function to call, in the form of RTL. */ | |
1539 | if (fndecl) | |
1540 | { | |
1541 | /* If this is the first use of the function, see if we need to | |
1542 | make an external definition for it. */ | |
1543 | if (! TREE_USED (fndecl)) | |
1544 | { | |
1545 | assemble_external (fndecl); | |
1546 | TREE_USED (fndecl) = 1; | |
1547 | } | |
1548 | ||
1549 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1550 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1551 | } | |
1552 | else | |
1553 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1554 | { | |
1555 | push_temp_slots (); | |
09e2bf48 | 1556 | funexp = expand_expr (addr, NULL_RTX, VOIDmode, 0); |
f725a3ec | 1557 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
a45bdd02 JL |
1558 | emit_queue (); |
1559 | } | |
1560 | return funexp; | |
1561 | } | |
1562 | ||
21a3b983 JL |
1563 | /* Do the register loads required for any wholly-register parms or any |
1564 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1565 | expressions were already evaluated. |
21a3b983 JL |
1566 | |
1567 | Mark all register-parms as living through the call, putting these USE | |
d329e058 AJ |
1568 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1569 | ||
0cdca92b DJ |
1570 | When IS_SIBCALL, perform the check_sibcall_overlap_argument_overlap |
1571 | checking, setting *SIBCALL_FAILURE if appropriate. */ | |
21a3b983 JL |
1572 | |
1573 | static void | |
d329e058 AJ |
1574 | load_register_parameters (struct arg_data *args, int num_actuals, |
1575 | rtx *call_fusage, int flags, int is_sibcall, | |
1576 | int *sibcall_failure) | |
21a3b983 JL |
1577 | { |
1578 | int i, j; | |
1579 | ||
1580 | #ifdef LOAD_ARGS_REVERSED | |
1581 | for (i = num_actuals - 1; i >= 0; i--) | |
1582 | #else | |
1583 | for (i = 0; i < num_actuals; i++) | |
1584 | #endif | |
1585 | { | |
099e9712 JH |
1586 | rtx reg = ((flags & ECF_SIBCALL) |
1587 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1588 | if (reg) |
1589 | { | |
6e985040 AM |
1590 | int partial = args[i].partial; |
1591 | int nregs; | |
1592 | int size = 0; | |
0cdca92b | 1593 | rtx before_arg = get_last_insn (); |
21a3b983 JL |
1594 | /* Set to non-negative if must move a word at a time, even if just |
1595 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1596 | we just use a normal move insn. This value can be zero if the | |
1597 | argument is a zero size structure with no fields. */ | |
6e985040 AM |
1598 | nregs = -1; |
1599 | if (partial) | |
1600 | nregs = partial; | |
1601 | else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) | |
1602 | { | |
1603 | size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1604 | nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1605 | } | |
1606 | else | |
1607 | size = GET_MODE_SIZE (args[i].mode); | |
21a3b983 JL |
1608 | |
1609 | /* Handle calls that pass values in multiple non-contiguous | |
1610 | locations. The Irix 6 ABI has examples of this. */ | |
1611 | ||
1612 | if (GET_CODE (reg) == PARALLEL) | |
6e985040 AM |
1613 | { |
1614 | tree type = TREE_TYPE (args[i].tree_value); | |
1615 | emit_group_load (reg, args[i].value, type, | |
1616 | int_size_in_bytes (type)); | |
1617 | } | |
21a3b983 JL |
1618 | |
1619 | /* If simple case, just do move. If normal partial, store_one_arg | |
1620 | has already loaded the register for us. In all other cases, | |
1621 | load the register(s) from memory. */ | |
1622 | ||
6e985040 AM |
1623 | else if (nregs == -1 |
1624 | #ifdef BLOCK_REG_PADDING | |
1625 | && !(size < UNITS_PER_WORD | |
1626 | && (args[i].locate.where_pad | |
1627 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1628 | #endif | |
1629 | ) | |
21a3b983 JL |
1630 | emit_move_insn (reg, args[i].value); |
1631 | ||
1632 | /* If we have pre-computed the values to put in the registers in | |
1633 | the case of non-aligned structures, copy them in now. */ | |
1634 | ||
1635 | else if (args[i].n_aligned_regs != 0) | |
1636 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1637 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1638 | args[i].aligned_regs[j]); | |
1639 | ||
1640 | else if (partial == 0 || args[i].pass_on_stack) | |
6e985040 AM |
1641 | { |
1642 | rtx mem = validize_mem (args[i].value); | |
1643 | ||
1644 | #ifdef BLOCK_REG_PADDING | |
1645 | /* Handle case where we have a value that needs shifting | |
1646 | up to the msb. eg. a QImode value and we're padding | |
1647 | upward on a BYTES_BIG_ENDIAN machine. */ | |
1648 | if (nregs == -1) | |
1649 | { | |
1650 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1651 | rtx x; | |
1652 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
1653 | x = expand_binop (word_mode, ashl_optab, mem, | |
1654 | GEN_INT (shift), ri, 1, OPTAB_WIDEN); | |
1655 | if (x != ri) | |
1656 | emit_move_insn (ri, x); | |
1657 | } | |
1658 | ||
1659 | /* Handle a BLKmode that needs shifting. */ | |
1660 | else if (nregs == 1 && size < UNITS_PER_WORD | |
1661 | && args[i].locate.where_pad == downward) | |
1662 | { | |
1663 | rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1664 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1665 | rtx x = gen_reg_rtx (word_mode); | |
1666 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
1667 | optab dir = BYTES_BIG_ENDIAN ? lshr_optab : ashl_optab; | |
1668 | ||
1669 | emit_move_insn (x, tem); | |
1670 | x = expand_binop (word_mode, dir, x, GEN_INT (shift), | |
1671 | ri, 1, OPTAB_WIDEN); | |
1672 | if (x != ri) | |
1673 | emit_move_insn (ri, x); | |
1674 | } | |
1675 | else | |
1676 | #endif | |
1677 | move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); | |
1678 | } | |
21a3b983 | 1679 | |
0cdca92b DJ |
1680 | /* When a parameter is a block, and perhaps in other cases, it is |
1681 | possible that it did a load from an argument slot that was | |
32dd366d | 1682 | already clobbered. */ |
0cdca92b DJ |
1683 | if (is_sibcall |
1684 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1685 | *sibcall_failure = 1; | |
1686 | ||
21a3b983 JL |
1687 | /* Handle calls that pass values in multiple non-contiguous |
1688 | locations. The Irix 6 ABI has examples of this. */ | |
1689 | if (GET_CODE (reg) == PARALLEL) | |
1690 | use_group_regs (call_fusage, reg); | |
1691 | else if (nregs == -1) | |
1692 | use_reg (call_fusage, reg); | |
1693 | else | |
1694 | use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); | |
1695 | } | |
1696 | } | |
1697 | } | |
1698 | ||
ea11ca7e | 1699 | /* Try to integrate function. See expand_inline_function for documentation |
f2d33f13 JH |
1700 | about the parameters. */ |
1701 | ||
1702 | static rtx | |
d329e058 AJ |
1703 | try_to_integrate (tree fndecl, tree actparms, rtx target, int ignore, |
1704 | tree type, rtx structure_value_addr) | |
f2d33f13 JH |
1705 | { |
1706 | rtx temp; | |
1707 | rtx before_call; | |
1708 | int i; | |
1709 | rtx old_stack_level = 0; | |
7657ad0a | 1710 | int reg_parm_stack_space = 0; |
f2d33f13 JH |
1711 | |
1712 | #ifdef REG_PARM_STACK_SPACE | |
1713 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1714 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
1715 | #else | |
1716 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
1717 | #endif | |
1718 | #endif | |
1719 | ||
1720 | before_call = get_last_insn (); | |
1721 | ||
ea11ca7e JM |
1722 | timevar_push (TV_INTEGRATION); |
1723 | ||
f2d33f13 JH |
1724 | temp = expand_inline_function (fndecl, actparms, target, |
1725 | ignore, type, | |
1726 | structure_value_addr); | |
1727 | ||
ea11ca7e JM |
1728 | timevar_pop (TV_INTEGRATION); |
1729 | ||
f2d33f13 | 1730 | /* If inlining succeeded, return. */ |
60e8b9f0 | 1731 | if (temp != (rtx) (size_t) - 1) |
f2d33f13 JH |
1732 | { |
1733 | if (ACCUMULATE_OUTGOING_ARGS) | |
1734 | { | |
1735 | /* If the outgoing argument list must be preserved, push | |
1736 | the stack before executing the inlined function if it | |
1737 | makes any calls. */ | |
1738 | ||
546ff777 AM |
1739 | i = reg_parm_stack_space; |
1740 | if (i > highest_outgoing_arg_in_use) | |
1741 | i = highest_outgoing_arg_in_use; | |
1742 | while (--i >= 0 && stack_usage_map[i] == 0) | |
1743 | ; | |
f2d33f13 JH |
1744 | |
1745 | if (stack_arg_under_construction || i >= 0) | |
1746 | { | |
1747 | rtx first_insn | |
1748 | = before_call ? NEXT_INSN (before_call) : get_insns (); | |
1749 | rtx insn = NULL_RTX, seq; | |
1750 | ||
1751 | /* Look for a call in the inline function code. | |
1752 | If DECL_SAVED_INSNS (fndecl)->outgoing_args_size is | |
1753 | nonzero then there is a call and it is not necessary | |
1754 | to scan the insns. */ | |
1755 | ||
1756 | if (DECL_SAVED_INSNS (fndecl)->outgoing_args_size == 0) | |
1757 | for (insn = first_insn; insn; insn = NEXT_INSN (insn)) | |
1758 | if (GET_CODE (insn) == CALL_INSN) | |
1759 | break; | |
1760 | ||
1761 | if (insn) | |
1762 | { | |
1763 | /* Reserve enough stack space so that the largest | |
1764 | argument list of any function call in the inline | |
1765 | function does not overlap the argument list being | |
1766 | evaluated. This is usually an overestimate because | |
1767 | allocate_dynamic_stack_space reserves space for an | |
1768 | outgoing argument list in addition to the requested | |
1769 | space, but there is no way to ask for stack space such | |
1770 | that an argument list of a certain length can be | |
f725a3ec | 1771 | safely constructed. |
f2d33f13 JH |
1772 | |
1773 | Add the stack space reserved for register arguments, if | |
1774 | any, in the inline function. What is really needed is the | |
1775 | largest value of reg_parm_stack_space in the inline | |
1776 | function, but that is not available. Using the current | |
1777 | value of reg_parm_stack_space is wrong, but gives | |
1778 | correct results on all supported machines. */ | |
1779 | ||
1780 | int adjust = (DECL_SAVED_INSNS (fndecl)->outgoing_args_size | |
1781 | + reg_parm_stack_space); | |
1782 | ||
1783 | start_sequence (); | |
1784 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
1785 | allocate_dynamic_stack_space (GEN_INT (adjust), | |
1786 | NULL_RTX, BITS_PER_UNIT); | |
1787 | seq = get_insns (); | |
1788 | end_sequence (); | |
2f937369 | 1789 | emit_insn_before (seq, first_insn); |
f2d33f13 JH |
1790 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
1791 | } | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
1796 | checks in store_expr. They can be equivalent but not equal in the | |
1797 | case of a function that returns BLKmode. */ | |
1798 | if (temp != target && rtx_equal_p (temp, target)) | |
1799 | return target; | |
1800 | return temp; | |
1801 | } | |
1802 | ||
1803 | /* If inlining failed, mark FNDECL as needing to be compiled | |
1804 | separately after all. If function was declared inline, | |
1805 | give a warning. */ | |
1806 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
1807 | && optimize > 0 && !TREE_ADDRESSABLE (fndecl)) | |
1808 | { | |
1809 | warning_with_decl (fndecl, "inlining failed in call to `%s'"); | |
1810 | warning ("called from here"); | |
1811 | } | |
dffd7eb6 | 1812 | (*lang_hooks.mark_addressable) (fndecl); |
60e8b9f0 | 1813 | return (rtx) (size_t) - 1; |
f2d33f13 JH |
1814 | } |
1815 | ||
739fb049 MM |
1816 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1817 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1818 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1819 | arguments. So, we compute an adjust to the stack pointer for an |
1820 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1821 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1822 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1823 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1824 | |
ce48579b | 1825 | static int |
d329e058 AJ |
1826 | combine_pending_stack_adjustment_and_call (int unadjusted_args_size, |
1827 | struct args_size *args_size, | |
1828 | int preferred_unit_stack_boundary) | |
739fb049 MM |
1829 | { |
1830 | /* The number of bytes to pop so that the stack will be | |
1831 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1832 | HOST_WIDE_INT adjustment; | |
1833 | /* The alignment of the stack after the arguments are pushed, if we | |
1834 | just pushed the arguments without adjust the stack here. */ | |
1835 | HOST_WIDE_INT unadjusted_alignment; | |
1836 | ||
f725a3ec | 1837 | unadjusted_alignment |
739fb049 MM |
1838 | = ((stack_pointer_delta + unadjusted_args_size) |
1839 | % preferred_unit_stack_boundary); | |
1840 | ||
1841 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1842 | as possible -- leaving just enough left to cancel out the | |
1843 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1844 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1845 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1846 | ||
1847 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
1848 | unadjusted_alignment |
1849 | = (unadjusted_alignment | |
739fb049 MM |
1850 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1851 | adjustment = pending_stack_adjust; | |
1852 | /* Push enough additional bytes that the stack will be aligned | |
1853 | after the arguments are pushed. */ | |
e079dcdb HB |
1854 | if (preferred_unit_stack_boundary > 1) |
1855 | { | |
3e555c7d | 1856 | if (unadjusted_alignment > 0) |
f725a3ec | 1857 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 1858 | else |
f725a3ec | 1859 | adjustment += unadjusted_alignment; |
e079dcdb | 1860 | } |
f725a3ec | 1861 | |
739fb049 MM |
1862 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1863 | bytes after the call. The right number is the entire | |
1864 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1865 | by the arguments in the first place. */ | |
f725a3ec | 1866 | args_size->constant |
739fb049 MM |
1867 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1868 | ||
ce48579b | 1869 | return adjustment; |
739fb049 MM |
1870 | } |
1871 | ||
c67846f2 JJ |
1872 | /* Scan X expression if it does not dereference any argument slots |
1873 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1874 | bitmap). | |
da7d8304 | 1875 | Return nonzero if X expression dereferences such argument slots, |
c67846f2 JJ |
1876 | zero otherwise. */ |
1877 | ||
1878 | static int | |
d329e058 | 1879 | check_sibcall_argument_overlap_1 (rtx x) |
c67846f2 JJ |
1880 | { |
1881 | RTX_CODE code; | |
1882 | int i, j; | |
1883 | unsigned int k; | |
1884 | const char *fmt; | |
1885 | ||
1886 | if (x == NULL_RTX) | |
1887 | return 0; | |
1888 | ||
1889 | code = GET_CODE (x); | |
1890 | ||
1891 | if (code == MEM) | |
1892 | { | |
1893 | if (XEXP (x, 0) == current_function_internal_arg_pointer) | |
1894 | i = 0; | |
4c6b3b2a JJ |
1895 | else if (GET_CODE (XEXP (x, 0)) == PLUS |
1896 | && XEXP (XEXP (x, 0), 0) == | |
1897 | current_function_internal_arg_pointer | |
1898 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
c67846f2 JJ |
1899 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
1900 | else | |
1901 | return 0; | |
1902 | ||
d60eab50 AO |
1903 | #ifdef ARGS_GROW_DOWNWARD |
1904 | i = -i - GET_MODE_SIZE (GET_MODE (x)); | |
1905 | #endif | |
1906 | ||
c67846f2 JJ |
1907 | for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++) |
1908 | if (i + k < stored_args_map->n_bits | |
1909 | && TEST_BIT (stored_args_map, i + k)) | |
1910 | return 1; | |
1911 | ||
1912 | return 0; | |
1913 | } | |
1914 | ||
f725a3ec | 1915 | /* Scan all subexpressions. */ |
c67846f2 JJ |
1916 | fmt = GET_RTX_FORMAT (code); |
1917 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1918 | { | |
1919 | if (*fmt == 'e') | |
f725a3ec KH |
1920 | { |
1921 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1922 | return 1; | |
1923 | } | |
c67846f2 | 1924 | else if (*fmt == 'E') |
f725a3ec KH |
1925 | { |
1926 | for (j = 0; j < XVECLEN (x, i); j++) | |
1927 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1928 | return 1; | |
1929 | } | |
c67846f2 JJ |
1930 | } |
1931 | return 0; | |
c67846f2 JJ |
1932 | } |
1933 | ||
1934 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1935 | we already clobbered by tail call arguments (as noted in stored_args_map | |
0cdca92b DJ |
1936 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
1937 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1938 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1939 | slots, zero otherwise. */ | |
c67846f2 JJ |
1940 | |
1941 | static int | |
d329e058 | 1942 | check_sibcall_argument_overlap (rtx insn, struct arg_data *arg, int mark_stored_args_map) |
f725a3ec | 1943 | { |
c67846f2 JJ |
1944 | int low, high; |
1945 | ||
1946 | if (insn == NULL_RTX) | |
1947 | insn = get_insns (); | |
1948 | else | |
1949 | insn = NEXT_INSN (insn); | |
1950 | ||
1951 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
1952 | if (INSN_P (insn) |
1953 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
1954 | break; |
1955 | ||
0cdca92b DJ |
1956 | if (mark_stored_args_map) |
1957 | { | |
d60eab50 | 1958 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 1959 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
d60eab50 | 1960 | #else |
e7949876 | 1961 | low = arg->locate.slot_offset.constant; |
d60eab50 AO |
1962 | #endif |
1963 | ||
e7949876 | 1964 | for (high = low + arg->locate.size.constant; low < high; low++) |
0cdca92b DJ |
1965 | SET_BIT (stored_args_map, low); |
1966 | } | |
c67846f2 JJ |
1967 | return insn != NULL_RTX; |
1968 | } | |
1969 | ||
292e35a3 | 1970 | static tree |
d329e058 | 1971 | fix_unsafe_tree (tree t) |
292e35a3 CE |
1972 | { |
1973 | switch (unsafe_for_reeval (t)) | |
1974 | { | |
1975 | case 0: /* Safe. */ | |
1976 | break; | |
1977 | ||
1978 | case 1: /* Mildly unsafe. */ | |
1979 | t = unsave_expr (t); | |
1980 | break; | |
1981 | ||
1982 | case 2: /* Wildly unsafe. */ | |
1983 | { | |
1984 | tree var = build_decl (VAR_DECL, NULL_TREE, | |
1985 | TREE_TYPE (t)); | |
1986 | SET_DECL_RTL (var, | |
1987 | expand_expr (t, NULL_RTX, VOIDmode, EXPAND_NORMAL)); | |
1988 | t = var; | |
1989 | } | |
1990 | break; | |
1991 | ||
1992 | default: | |
1993 | abort (); | |
1994 | } | |
1995 | return t; | |
1996 | } | |
1997 | ||
51bbfa0c RS |
1998 | /* Generate all the code for a function call |
1999 | and return an rtx for its value. | |
2000 | Store the value in TARGET (specified as an rtx) if convenient. | |
2001 | If the value is stored in TARGET then TARGET is returned. | |
2002 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
2003 | ||
2004 | rtx | |
d329e058 | 2005 | expand_call (tree exp, rtx target, int ignore) |
51bbfa0c | 2006 | { |
0a1c58a2 JL |
2007 | /* Nonzero if we are currently expanding a call. */ |
2008 | static int currently_expanding_call = 0; | |
2009 | ||
51bbfa0c RS |
2010 | /* List of actual parameters. */ |
2011 | tree actparms = TREE_OPERAND (exp, 1); | |
2012 | /* RTX for the function to be called. */ | |
2013 | rtx funexp; | |
0a1c58a2 JL |
2014 | /* Sequence of insns to perform a tail recursive "call". */ |
2015 | rtx tail_recursion_insns = NULL_RTX; | |
2016 | /* Sequence of insns to perform a normal "call". */ | |
2017 | rtx normal_call_insns = NULL_RTX; | |
2018 | /* Sequence of insns to perform a tail recursive "call". */ | |
2019 | rtx tail_call_insns = NULL_RTX; | |
51bbfa0c RS |
2020 | /* Data type of the function. */ |
2021 | tree funtype; | |
ded9bf77 | 2022 | tree type_arg_types; |
51bbfa0c RS |
2023 | /* Declaration of the function being called, |
2024 | or 0 if the function is computed (not known by name). */ | |
2025 | tree fndecl = 0; | |
0a1c58a2 | 2026 | rtx insn; |
099e9712 JH |
2027 | int try_tail_call = 1; |
2028 | int try_tail_recursion = 1; | |
0a1c58a2 | 2029 | int pass; |
51bbfa0c RS |
2030 | |
2031 | /* Register in which non-BLKmode value will be returned, | |
2032 | or 0 if no value or if value is BLKmode. */ | |
2033 | rtx valreg; | |
2034 | /* Address where we should return a BLKmode value; | |
2035 | 0 if value not BLKmode. */ | |
2036 | rtx structure_value_addr = 0; | |
2037 | /* Nonzero if that address is being passed by treating it as | |
2038 | an extra, implicit first parameter. Otherwise, | |
2039 | it is passed by being copied directly into struct_value_rtx. */ | |
2040 | int structure_value_addr_parm = 0; | |
2041 | /* Size of aggregate value wanted, or zero if none wanted | |
2042 | or if we are using the non-reentrant PCC calling convention | |
2043 | or expecting the value in registers. */ | |
e5e809f4 | 2044 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
2045 | /* Nonzero if called function returns an aggregate in memory PCC style, |
2046 | by returning the address of where to find it. */ | |
2047 | int pcc_struct_value = 0; | |
2048 | ||
2049 | /* Number of actual parameters in this call, including struct value addr. */ | |
2050 | int num_actuals; | |
2051 | /* Number of named args. Args after this are anonymous ones | |
2052 | and they must all go on the stack. */ | |
2053 | int n_named_args; | |
51bbfa0c RS |
2054 | |
2055 | /* Vector of information about each argument. | |
2056 | Arguments are numbered in the order they will be pushed, | |
2057 | not the order they are written. */ | |
2058 | struct arg_data *args; | |
2059 | ||
2060 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2061 | struct args_size args_size; | |
099e9712 | 2062 | struct args_size adjusted_args_size; |
51bbfa0c | 2063 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 2064 | int unadjusted_args_size; |
51bbfa0c RS |
2065 | /* Data on reg parms scanned so far. */ |
2066 | CUMULATIVE_ARGS args_so_far; | |
2067 | /* Nonzero if a reg parm has been scanned. */ | |
2068 | int reg_parm_seen; | |
efd65a8b | 2069 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 2070 | |
f725a3ec | 2071 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
2072 | If stack space is allocated for register parameters, but not by the |
2073 | caller, then it is preallocated in the fixed part of the stack frame. | |
2074 | So the entire argument block must then be preallocated (i.e., we | |
2075 | ignore PUSH_ROUNDING in that case). */ | |
2076 | ||
f73ad30e | 2077 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 2078 | |
f72aed24 | 2079 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
2080 | int reg_parm_stack_space = 0; |
2081 | ||
51bbfa0c RS |
2082 | /* Address of space preallocated for stack parms |
2083 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
2084 | rtx argblock = 0; | |
2085 | ||
f2d33f13 JH |
2086 | /* Mask of ECF_ flags. */ |
2087 | int flags = 0; | |
51bbfa0c RS |
2088 | /* Nonzero if this is a call to an inline function. */ |
2089 | int is_integrable = 0; | |
f73ad30e | 2090 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c | 2091 | /* Define the boundary of the register parm stack space that needs to be |
b820d2b8 AM |
2092 | saved, if any. */ |
2093 | int low_to_save, high_to_save; | |
51bbfa0c RS |
2094 | rtx save_area = 0; /* Place that it is saved */ |
2095 | #endif | |
2096 | ||
51bbfa0c RS |
2097 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2098 | char *initial_stack_usage_map = stack_usage_map; | |
51bbfa0c | 2099 | |
38afb23f OH |
2100 | int old_stack_allocated; |
2101 | ||
2102 | /* State variables to track stack modifications. */ | |
51bbfa0c | 2103 | rtx old_stack_level = 0; |
38afb23f | 2104 | int old_stack_arg_under_construction = 0; |
79be3418 | 2105 | int old_pending_adj = 0; |
51bbfa0c | 2106 | int old_inhibit_defer_pop = inhibit_defer_pop; |
38afb23f OH |
2107 | |
2108 | /* Some stack pointer alterations we make are performed via | |
2109 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
2110 | which we then also need to save/restore along the way. */ | |
a259f218 | 2111 | int old_stack_pointer_delta = 0; |
38afb23f | 2112 | |
0a1c58a2 | 2113 | rtx call_fusage; |
b3694847 | 2114 | tree p = TREE_OPERAND (exp, 0); |
09e2bf48 | 2115 | tree addr = TREE_OPERAND (exp, 0); |
b3694847 | 2116 | int i; |
739fb049 MM |
2117 | /* The alignment of the stack, in bits. */ |
2118 | HOST_WIDE_INT preferred_stack_boundary; | |
2119 | /* The alignment of the stack, in bytes. */ | |
2120 | HOST_WIDE_INT preferred_unit_stack_boundary; | |
51bbfa0c | 2121 | |
f2d33f13 JH |
2122 | /* See if this is "nothrow" function call. */ |
2123 | if (TREE_NOTHROW (exp)) | |
2124 | flags |= ECF_NOTHROW; | |
2125 | ||
51bbfa0c RS |
2126 | /* See if we can find a DECL-node for the actual function. |
2127 | As a result, decide whether this is a call to an integrable function. */ | |
2128 | ||
39b0dce7 JM |
2129 | fndecl = get_callee_fndecl (exp); |
2130 | if (fndecl) | |
51bbfa0c | 2131 | { |
39b0dce7 JM |
2132 | if (!flag_no_inline |
2133 | && fndecl != current_function_decl | |
2134 | && DECL_INLINE (fndecl) | |
2135 | && DECL_SAVED_INSNS (fndecl) | |
2136 | && DECL_SAVED_INSNS (fndecl)->inlinable) | |
2137 | is_integrable = 1; | |
2138 | else if (! TREE_ADDRESSABLE (fndecl)) | |
51bbfa0c | 2139 | { |
39b0dce7 JM |
2140 | /* In case this function later becomes inlinable, |
2141 | record that there was already a non-inline call to it. | |
51bbfa0c | 2142 | |
39b0dce7 JM |
2143 | Use abstraction instead of setting TREE_ADDRESSABLE |
2144 | directly. */ | |
2145 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
2146 | && optimize > 0) | |
2147 | { | |
2148 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
2149 | warning ("called from here"); | |
51bbfa0c | 2150 | } |
dffd7eb6 | 2151 | (*lang_hooks.mark_addressable) (fndecl); |
51bbfa0c | 2152 | } |
39b0dce7 JM |
2153 | |
2154 | flags |= flags_from_decl_or_type (fndecl); | |
51bbfa0c RS |
2155 | } |
2156 | ||
f725a3ec | 2157 | /* If we don't have specific function to call, see if we have a |
f2d33f13 | 2158 | attributes set in the type. */ |
39b0dce7 | 2159 | else |
7393c642 RK |
2160 | flags |= flags_from_decl_or_type (TREE_TYPE (TREE_TYPE (p))); |
2161 | ||
8c6a8269 RS |
2162 | /* Warn if this value is an aggregate type, |
2163 | regardless of which calling convention we are using for it. */ | |
2164 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) | |
2165 | warning ("function call has aggregate value"); | |
2166 | ||
2167 | /* If the result of a pure or const function call is ignored (or void), | |
2168 | and none of its arguments are volatile, we can avoid expanding the | |
2169 | call and just evaluate the arguments for side-effects. */ | |
2170 | if ((flags & (ECF_CONST | ECF_PURE)) | |
2171 | && (ignore || target == const0_rtx | |
2172 | || TYPE_MODE (TREE_TYPE (exp)) == VOIDmode)) | |
2173 | { | |
2174 | bool volatilep = false; | |
2175 | tree arg; | |
2176 | ||
2177 | for (arg = actparms; arg; arg = TREE_CHAIN (arg)) | |
2178 | if (TREE_THIS_VOLATILE (TREE_VALUE (arg))) | |
2179 | { | |
2180 | volatilep = true; | |
2181 | break; | |
2182 | } | |
2183 | ||
2184 | if (! volatilep) | |
2185 | { | |
2186 | for (arg = actparms; arg; arg = TREE_CHAIN (arg)) | |
2187 | expand_expr (TREE_VALUE (arg), const0_rtx, | |
2188 | VOIDmode, EXPAND_NORMAL); | |
2189 | return const0_rtx; | |
2190 | } | |
2191 | } | |
2192 | ||
6f90e075 JW |
2193 | #ifdef REG_PARM_STACK_SPACE |
2194 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
2195 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
2196 | #else | |
2197 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
2198 | #endif | |
2199 | #endif | |
2200 | ||
f73ad30e JH |
2201 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2202 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
e5e809f4 JL |
2203 | must_preallocate = 1; |
2204 | #endif | |
2205 | ||
51bbfa0c RS |
2206 | /* Set up a place to return a structure. */ |
2207 | ||
2208 | /* Cater to broken compilers. */ | |
2209 | if (aggregate_value_p (exp)) | |
2210 | { | |
2211 | /* This call returns a big structure. */ | |
53d4257f | 2212 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
51bbfa0c RS |
2213 | |
2214 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2215 | { |
2216 | pcc_struct_value = 1; | |
0dd532dc JW |
2217 | /* Easier than making that case work right. */ |
2218 | if (is_integrable) | |
2219 | { | |
2220 | /* In case this is a static function, note that it has been | |
2221 | used. */ | |
2222 | if (! TREE_ADDRESSABLE (fndecl)) | |
dffd7eb6 | 2223 | (*lang_hooks.mark_addressable) (fndecl); |
0dd532dc JW |
2224 | is_integrable = 0; |
2225 | } | |
9e7b1d0a RS |
2226 | } |
2227 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2228 | { | |
2229 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 2230 | |
4977bab6 | 2231 | if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (exp)) |
89ea02fb | 2232 | { |
f32ac70d JM |
2233 | /* The structure value address arg is already in actparms. |
2234 | Pull it out. It might be nice to just leave it there, but | |
2235 | we need to set structure_value_addr. */ | |
2236 | tree return_arg = TREE_VALUE (actparms); | |
2237 | actparms = TREE_CHAIN (actparms); | |
2238 | structure_value_addr = expand_expr (return_arg, NULL_RTX, | |
2239 | VOIDmode, EXPAND_NORMAL); | |
89ea02fb | 2240 | } |
4977bab6 | 2241 | else if (target && GET_CODE (target) == MEM) |
9e7b1d0a RS |
2242 | structure_value_addr = XEXP (target, 0); |
2243 | else | |
2244 | { | |
9e7b1d0a RS |
2245 | /* For variable-sized objects, we must be called with a target |
2246 | specified. If we were to allocate space on the stack here, | |
2247 | we would have no way of knowing when to free it. */ | |
1da68f56 | 2248 | rtx d = assign_temp (TREE_TYPE (exp), 1, 1, 1); |
51bbfa0c | 2249 | |
4361b41d MM |
2250 | mark_temp_addr_taken (d); |
2251 | structure_value_addr = XEXP (d, 0); | |
9e7b1d0a RS |
2252 | target = 0; |
2253 | } | |
2254 | } | |
2255 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2256 | } |
2257 | ||
2258 | /* If called function is inline, try to integrate it. */ | |
2259 | ||
2260 | if (is_integrable) | |
2261 | { | |
f2d33f13 JH |
2262 | rtx temp = try_to_integrate (fndecl, actparms, target, |
2263 | ignore, TREE_TYPE (exp), | |
2264 | structure_value_addr); | |
60e8b9f0 | 2265 | if (temp != (rtx) (size_t) - 1) |
f2d33f13 | 2266 | return temp; |
51bbfa0c RS |
2267 | } |
2268 | ||
099e9712 | 2269 | /* Figure out the amount to which the stack should be aligned. */ |
099e9712 | 2270 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
b255a036 JH |
2271 | if (fndecl) |
2272 | { | |
2273 | struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
2274 | if (i && i->preferred_incoming_stack_boundary) | |
2275 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; | |
2276 | } | |
099e9712 JH |
2277 | |
2278 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
09e2bf48 | 2279 | funtype = TREE_TYPE (addr); |
099e9712 JH |
2280 | if (! POINTER_TYPE_P (funtype)) |
2281 | abort (); | |
2282 | funtype = TREE_TYPE (funtype); | |
2283 | ||
ded9bf77 AH |
2284 | /* Munge the tree to split complex arguments into their imaginary |
2285 | and real parts. */ | |
2286 | if (SPLIT_COMPLEX_ARGS) | |
2287 | { | |
2288 | type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); | |
2289 | actparms = split_complex_values (actparms); | |
2290 | } | |
2291 | else | |
2292 | type_arg_types = TYPE_ARG_TYPES (funtype); | |
2293 | ||
099e9712 JH |
2294 | /* See if this is a call to a function that can return more than once |
2295 | or a call to longjmp or malloc. */ | |
2296 | flags |= special_function_p (fndecl, flags); | |
2297 | ||
2298 | if (flags & ECF_MAY_BE_ALLOCA) | |
2299 | current_function_calls_alloca = 1; | |
2300 | ||
2301 | /* If struct_value_rtx is 0, it means pass the address | |
2302 | as if it were an extra parameter. */ | |
2303 | if (structure_value_addr && struct_value_rtx == 0) | |
2304 | { | |
2305 | /* If structure_value_addr is a REG other than | |
2306 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2307 | is not a REG, we must always copy it into a register. | |
2308 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2309 | register in some cases. */ | |
2310 | rtx temp = (GET_CODE (structure_value_addr) != REG | |
2311 | || (ACCUMULATE_OUTGOING_ARGS | |
2312 | && stack_arg_under_construction | |
2313 | && structure_value_addr == virtual_outgoing_args_rtx) | |
2314 | ? copy_addr_to_reg (structure_value_addr) | |
2315 | : structure_value_addr); | |
2316 | ||
2317 | actparms | |
2318 | = tree_cons (error_mark_node, | |
2319 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2320 | temp), | |
2321 | actparms); | |
2322 | structure_value_addr_parm = 1; | |
2323 | } | |
2324 | ||
2325 | /* Count the arguments and set NUM_ACTUALS. */ | |
2326 | for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p)) | |
2327 | num_actuals++; | |
2328 | ||
2329 | /* Compute number of named args. | |
2330 | Normally, don't include the last named arg if anonymous args follow. | |
2331 | We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero. | |
2332 | (If no anonymous args follow, the result of list_length is actually | |
2333 | one too large. This is harmless.) | |
2334 | ||
2335 | If PRETEND_OUTGOING_VARARGS_NAMED is set and STRICT_ARGUMENT_NAMING is | |
2336 | zero, this machine will be able to place unnamed args that were | |
2337 | passed in registers into the stack. So treat all args as named. | |
2338 | This allows the insns emitting for a specific argument list to be | |
2339 | independent of the function declaration. | |
2340 | ||
2341 | If PRETEND_OUTGOING_VARARGS_NAMED is not set, we do not have any | |
2342 | reliable way to pass unnamed args in registers, so we must force | |
2343 | them into memory. */ | |
2344 | ||
2345 | if ((STRICT_ARGUMENT_NAMING | |
2346 | || ! PRETEND_OUTGOING_VARARGS_NAMED) | |
ded9bf77 | 2347 | && type_arg_types != 0) |
099e9712 | 2348 | n_named_args |
ded9bf77 | 2349 | = (list_length (type_arg_types) |
099e9712 JH |
2350 | /* Don't include the last named arg. */ |
2351 | - (STRICT_ARGUMENT_NAMING ? 0 : 1) | |
2352 | /* Count the struct value address, if it is passed as a parm. */ | |
2353 | + structure_value_addr_parm); | |
2354 | else | |
2355 | /* If we know nothing, treat all args as named. */ | |
2356 | n_named_args = num_actuals; | |
2357 | ||
2358 | /* Start updating where the next arg would go. | |
2359 | ||
2360 | On some machines (such as the PA) indirect calls have a different | |
2361 | calling convention than normal calls. The last argument in | |
2362 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2363 | or not. */ | |
563a317a | 2364 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl); |
099e9712 | 2365 | |
099e9712 | 2366 | /* Make a vector to hold all the information about each arg. */ |
f725a3ec | 2367 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); |
961192e1 | 2368 | memset ((char *) args, 0, num_actuals * sizeof (struct arg_data)); |
099e9712 | 2369 | |
d80d2d2a KH |
2370 | /* Build up entries in the ARGS array, compute the size of the |
2371 | arguments into ARGS_SIZE, etc. */ | |
099e9712 JH |
2372 | initialize_argument_information (num_actuals, args, &args_size, |
2373 | n_named_args, actparms, fndecl, | |
2374 | &args_so_far, reg_parm_stack_space, | |
2375 | &old_stack_level, &old_pending_adj, | |
2376 | &must_preallocate, &flags); | |
2377 | ||
2378 | if (args_size.var) | |
2379 | { | |
2380 | /* If this function requires a variable-sized argument list, don't | |
2381 | try to make a cse'able block for this call. We may be able to | |
2382 | do this eventually, but it is too complicated to keep track of | |
6d2f8887 | 2383 | what insns go in the cse'able block and which don't. */ |
099e9712 | 2384 | |
53d4257f | 2385 | flags &= ~ECF_LIBCALL_BLOCK; |
099e9712 JH |
2386 | must_preallocate = 1; |
2387 | } | |
2388 | ||
2389 | /* Now make final decision about preallocating stack space. */ | |
2390 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2391 | num_actuals, args, | |
2392 | &args_size); | |
2393 | ||
2394 | /* If the structure value address will reference the stack pointer, we | |
2395 | must stabilize it. We don't need to do this if we know that we are | |
2396 | not going to adjust the stack pointer in processing this call. */ | |
2397 | ||
2398 | if (structure_value_addr | |
2399 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2400 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2401 | structure_value_addr)) | |
2402 | && (args_size.var | |
2403 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2404 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2405 | |
194c7c45 RH |
2406 | /* Tail calls can make things harder to debug, and we're traditionally |
2407 | pushed these optimizations into -O2. Don't try if we're already | |
fb158467 JH |
2408 | expanding a call, as that means we're an argument. Don't try if |
2409 | there's cleanups, as we know there's code to follow the call. | |
e2ee9912 | 2410 | |
f725a3ec | 2411 | If rtx_equal_function_value_matters is false, that means we've |
e2ee9912 RH |
2412 | finished with regular parsing. Which means that some of the |
2413 | machinery we use to generate tail-calls is no longer in place. | |
2414 | This is most often true of sjlj-exceptions, which we couldn't | |
2415 | tail-call to anyway. */ | |
0a1c58a2 | 2416 | |
099e9712 JH |
2417 | if (currently_expanding_call++ != 0 |
2418 | || !flag_optimize_sibling_calls | |
2419 | || !rtx_equal_function_value_matters | |
de1f5659 | 2420 | || any_pending_cleanups () |
099e9712 JH |
2421 | || args_size.var) |
2422 | try_tail_call = try_tail_recursion = 0; | |
2423 | ||
2424 | /* Tail recursion fails, when we are not dealing with recursive calls. */ | |
2425 | if (!try_tail_recursion | |
09e2bf48 JH |
2426 | || TREE_CODE (addr) != ADDR_EXPR |
2427 | || TREE_OPERAND (addr, 0) != current_function_decl) | |
099e9712 JH |
2428 | try_tail_recursion = 0; |
2429 | ||
2430 | /* Rest of purposes for tail call optimizations to fail. */ | |
2431 | if ( | |
2432 | #ifdef HAVE_sibcall_epilogue | |
2433 | !HAVE_sibcall_epilogue | |
2434 | #else | |
2435 | 1 | |
2436 | #endif | |
2437 | || !try_tail_call | |
2438 | /* Doing sibling call optimization needs some work, since | |
2439 | structure_value_addr can be allocated on the stack. | |
2440 | It does not seem worth the effort since few optimizable | |
2441 | sibling calls will return a structure. */ | |
2442 | || structure_value_addr != NULL_RTX | |
4977bab6 ZW |
2443 | /* Check whether the target is able to optimize the call |
2444 | into a sibcall. */ | |
2445 | || !(*targetm.function_ok_for_sibcall) (fndecl, exp) | |
2446 | /* Functions that do not return exactly once may not be sibcall | |
2447 | optimized. */ | |
db655634 | 2448 | || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP | ECF_NORETURN)) |
09e2bf48 | 2449 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
6a48df45 OH |
2450 | /* If the called function is nested in the current one, it might access |
2451 | some of the caller's arguments, but could clobber them beforehand if | |
2452 | the argument areas are shared. */ | |
2453 | || (fndecl && decl_function_context (fndecl) == current_function_decl) | |
099e9712 JH |
2454 | /* If this function requires more stack slots than the current |
2455 | function, we cannot change it into a sibling call. */ | |
2456 | || args_size.constant > current_function_args_size | |
2457 | /* If the callee pops its own arguments, then it must pop exactly | |
2458 | the same number of arguments as the current function. */ | |
e076f71a AH |
2459 | || (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) |
2460 | != RETURN_POPS_ARGS (current_function_decl, | |
2461 | TREE_TYPE (current_function_decl), | |
2462 | current_function_args_size)) | |
2463 | || !(*lang_hooks.decls.ok_for_sibcall) (fndecl)) | |
e6f64875 | 2464 | try_tail_call = 0; |
497eb8c3 | 2465 | |
099e9712 JH |
2466 | if (try_tail_call || try_tail_recursion) |
2467 | { | |
2468 | int end, inc; | |
2469 | actparms = NULL_TREE; | |
194c7c45 RH |
2470 | /* Ok, we're going to give the tail call the old college try. |
2471 | This means we're going to evaluate the function arguments | |
2472 | up to three times. There are two degrees of badness we can | |
2473 | encounter, those that can be unsaved and those that can't. | |
2474 | (See unsafe_for_reeval commentary for details.) | |
2475 | ||
2476 | Generate a new argument list. Pass safe arguments through | |
f725a3ec | 2477 | unchanged. For the easy badness wrap them in UNSAVE_EXPRs. |
194c7c45 | 2478 | For hard badness, evaluate them now and put their resulting |
099e9712 JH |
2479 | rtx in a temporary VAR_DECL. |
2480 | ||
2481 | initialize_argument_information has ordered the array for the | |
2482 | order to be pushed, and we must remember this when reconstructing | |
f5143c46 | 2483 | the original argument order. */ |
4d393a0b | 2484 | |
099e9712 JH |
2485 | if (PUSH_ARGS_REVERSED) |
2486 | { | |
2487 | inc = 1; | |
2488 | i = 0; | |
2489 | end = num_actuals; | |
2490 | } | |
2491 | else | |
f725a3ec | 2492 | { |
099e9712 JH |
2493 | inc = -1; |
2494 | i = num_actuals - 1; | |
2495 | end = -1; | |
2496 | } | |
2497 | ||
2498 | for (; i != end; i += inc) | |
2499 | { | |
292e35a3 | 2500 | args[i].tree_value = fix_unsafe_tree (args[i].tree_value); |
099e9712 JH |
2501 | /* We need to build actparms for optimize_tail_recursion. We can |
2502 | safely trash away TREE_PURPOSE, since it is unused by this | |
2503 | function. */ | |
2504 | if (try_tail_recursion) | |
2505 | actparms = tree_cons (NULL_TREE, args[i].tree_value, actparms); | |
2506 | } | |
3dc575ff | 2507 | /* Do the same for the function address if it is an expression. */ |
292e35a3 | 2508 | if (!fndecl) |
09e2bf48 | 2509 | addr = fix_unsafe_tree (addr); |
194c7c45 RH |
2510 | /* Expanding one of those dangerous arguments could have added |
2511 | cleanups, but otherwise give it a whirl. */ | |
de1f5659 | 2512 | if (any_pending_cleanups ()) |
099e9712 | 2513 | try_tail_call = try_tail_recursion = 0; |
0a1c58a2 JL |
2514 | } |
2515 | ||
2516 | /* Generate a tail recursion sequence when calling ourselves. */ | |
2517 | ||
099e9712 | 2518 | if (try_tail_recursion) |
0a1c58a2 JL |
2519 | { |
2520 | /* We want to emit any pending stack adjustments before the tail | |
2521 | recursion "call". That way we know any adjustment after the tail | |
2522 | recursion call can be ignored if we indeed use the tail recursion | |
2523 | call expansion. */ | |
2524 | int save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2525 | int save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2526 | |
41c39533 RH |
2527 | /* Emit any queued insns now; otherwise they would end up in |
2528 | only one of the alternates. */ | |
2529 | emit_queue (); | |
2530 | ||
0a1c58a2 JL |
2531 | /* Use a new sequence to hold any RTL we generate. We do not even |
2532 | know if we will use this RTL yet. The final decision can not be | |
2533 | made until after RTL generation for the entire function is | |
2534 | complete. */ | |
b06775f9 | 2535 | start_sequence (); |
f5e846c8 MM |
2536 | /* If expanding any of the arguments creates cleanups, we can't |
2537 | do a tailcall. So, we'll need to pop the pending cleanups | |
2538 | list. If, however, all goes well, and there are no cleanups | |
2539 | then the call to expand_start_target_temps will have no | |
2540 | effect. */ | |
2541 | expand_start_target_temps (); | |
b06775f9 | 2542 | if (optimize_tail_recursion (actparms, get_last_insn ())) |
f5e846c8 | 2543 | { |
de1f5659 | 2544 | if (any_pending_cleanups ()) |
f5e846c8 MM |
2545 | try_tail_call = try_tail_recursion = 0; |
2546 | else | |
2547 | tail_recursion_insns = get_insns (); | |
2548 | } | |
2549 | expand_end_target_temps (); | |
0a1c58a2 JL |
2550 | end_sequence (); |
2551 | ||
0a1c58a2 JL |
2552 | /* Restore the original pending stack adjustment for the sibling and |
2553 | normal call cases below. */ | |
2554 | pending_stack_adjust = save_pending_stack_adjust; | |
1503a7ec | 2555 | stack_pointer_delta = save_stack_pointer_delta; |
0a1c58a2 JL |
2556 | } |
2557 | ||
099e9712 JH |
2558 | if (profile_arc_flag && (flags & ECF_FORK_OR_EXEC)) |
2559 | { | |
2560 | /* A fork duplicates the profile information, and an exec discards | |
2561 | it. We can't rely on fork/exec to be paired. So write out the | |
2562 | profile information we have gathered so far, and clear it. */ | |
2563 | /* ??? When Linux's __clone is called with CLONE_VM set, profiling | |
2564 | is subject to race conditions, just as with multithreaded | |
2565 | programs. */ | |
2566 | ||
68d28100 | 2567 | emit_library_call (gcov_flush_libfunc, LCT_ALWAYS_RETURN, VOIDmode, 0); |
099e9712 | 2568 | } |
0a1c58a2 | 2569 | |
c2f8b491 JH |
2570 | /* Ensure current function's preferred stack boundary is at least |
2571 | what we need. We don't have to increase alignment for recursive | |
2572 | functions. */ | |
2573 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2574 | && fndecl != current_function_decl) | |
2575 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
b255a036 JH |
2576 | if (fndecl == current_function_decl) |
2577 | cfun->recursive_call_emit = true; | |
c2f8b491 | 2578 | |
099e9712 | 2579 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2580 | |
099e9712 | 2581 | function_call_count++; |
39842893 | 2582 | |
0a1c58a2 JL |
2583 | /* We want to make two insn chains; one for a sibling call, the other |
2584 | for a normal call. We will select one of the two chains after | |
2585 | initial RTL generation is complete. */ | |
b820d2b8 | 2586 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
0a1c58a2 JL |
2587 | { |
2588 | int sibcall_failure = 0; | |
f5143c46 | 2589 | /* We want to emit any pending stack adjustments before the tail |
0a1c58a2 JL |
2590 | recursion "call". That way we know any adjustment after the tail |
2591 | recursion call can be ignored if we indeed use the tail recursion | |
2592 | call expansion. */ | |
5ac9118e KG |
2593 | int save_pending_stack_adjust = 0; |
2594 | int save_stack_pointer_delta = 0; | |
0a1c58a2 | 2595 | rtx insns; |
7d167afd | 2596 | rtx before_call, next_arg_reg; |
39842893 | 2597 | |
0a1c58a2 JL |
2598 | if (pass == 0) |
2599 | { | |
1c81f9fe JM |
2600 | /* Emit any queued insns now; otherwise they would end up in |
2601 | only one of the alternates. */ | |
2602 | emit_queue (); | |
2603 | ||
0a1c58a2 JL |
2604 | /* State variables we need to save and restore between |
2605 | iterations. */ | |
2606 | save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2607 | save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2608 | } |
f2d33f13 JH |
2609 | if (pass) |
2610 | flags &= ~ECF_SIBCALL; | |
2611 | else | |
2612 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2613 | |
0a1c58a2 | 2614 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2615 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2616 | argblock = 0; |
2617 | call_fusage = 0; | |
fa76d9e0 | 2618 | |
f725a3ec | 2619 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2620 | |
0a1c58a2 JL |
2621 | From this point on, if the sibling call fails, we want to set |
2622 | sibcall_failure instead of continuing the loop. */ | |
2623 | start_sequence (); | |
eecb6f50 | 2624 | |
b8d254e6 JJ |
2625 | if (pass == 0) |
2626 | { | |
2627 | /* We know at this point that there are not currently any | |
2628 | pending cleanups. If, however, in the process of evaluating | |
2629 | the arguments we were to create some, we'll need to be | |
2630 | able to get rid of them. */ | |
2631 | expand_start_target_temps (); | |
2632 | } | |
2633 | ||
0a1c58a2 JL |
2634 | /* Don't let pending stack adjusts add up to too much. |
2635 | Also, do all pending adjustments now if there is any chance | |
2636 | this might be a call to alloca or if we are expanding a sibling | |
b5cd4ed4 RK |
2637 | call sequence or if we are calling a function that is to return |
2638 | with stack pointer depressed. */ | |
0a1c58a2 | 2639 | if (pending_stack_adjust >= 32 |
b5cd4ed4 RK |
2640 | || (pending_stack_adjust > 0 |
2641 | && (flags & (ECF_MAY_BE_ALLOCA | ECF_SP_DEPRESSED))) | |
0a1c58a2 JL |
2642 | || pass == 0) |
2643 | do_pending_stack_adjust (); | |
51bbfa0c | 2644 | |
54fef245 RH |
2645 | /* When calling a const function, we must pop the stack args right away, |
2646 | so that the pop is deleted or moved with the call. */ | |
53d4257f | 2647 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
54fef245 RH |
2648 | NO_DEFER_POP; |
2649 | ||
6f90e075 | 2650 | #ifdef FINAL_REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2651 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, |
2652 | args_size.var); | |
6f90e075 | 2653 | #endif |
0a1c58a2 | 2654 | /* Precompute any arguments as needed. */ |
f8a097cd JH |
2655 | if (pass) |
2656 | precompute_arguments (flags, num_actuals, args); | |
51bbfa0c | 2657 | |
0a1c58a2 JL |
2658 | /* Now we are about to start emitting insns that can be deleted |
2659 | if a libcall is deleted. */ | |
53d4257f | 2660 | if (pass && (flags & (ECF_LIBCALL_BLOCK | ECF_MALLOC))) |
0a1c58a2 | 2661 | start_sequence (); |
51bbfa0c | 2662 | |
099e9712 | 2663 | adjusted_args_size = args_size; |
ce48579b RH |
2664 | /* Compute the actual size of the argument block required. The variable |
2665 | and constant sizes must be combined, the size may have to be rounded, | |
2666 | and there may be a minimum required size. When generating a sibcall | |
2667 | pattern, do not round up, since we'll be re-using whatever space our | |
2668 | caller provided. */ | |
2669 | unadjusted_args_size | |
f725a3ec KH |
2670 | = compute_argument_block_size (reg_parm_stack_space, |
2671 | &adjusted_args_size, | |
ce48579b RH |
2672 | (pass == 0 ? 0 |
2673 | : preferred_stack_boundary)); | |
2674 | ||
f725a3ec | 2675 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2676 | |
f8a097cd JH |
2677 | /* The argument block when performing a sibling call is the |
2678 | incoming argument block. */ | |
2679 | if (pass == 0) | |
c67846f2 JJ |
2680 | { |
2681 | argblock = virtual_incoming_args_rtx; | |
fcae219a R |
2682 | argblock |
2683 | #ifdef STACK_GROWS_DOWNWARD | |
2684 | = plus_constant (argblock, current_function_pretend_args_size); | |
2685 | #else | |
2686 | = plus_constant (argblock, -current_function_pretend_args_size); | |
2687 | #endif | |
c67846f2 JJ |
2688 | stored_args_map = sbitmap_alloc (args_size.constant); |
2689 | sbitmap_zero (stored_args_map); | |
2690 | } | |
ce48579b | 2691 | |
0a1c58a2 JL |
2692 | /* If we have no actual push instructions, or shouldn't use them, |
2693 | make space for all args right now. */ | |
099e9712 | 2694 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2695 | { |
0a1c58a2 JL |
2696 | if (old_stack_level == 0) |
2697 | { | |
2698 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
38afb23f | 2699 | old_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 JL |
2700 | old_pending_adj = pending_stack_adjust; |
2701 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2702 | /* stack_arg_under_construction says whether a stack arg is |
2703 | being constructed at the old stack level. Pushing the stack | |
2704 | gets a clean outgoing argument block. */ | |
2705 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2706 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2707 | } |
099e9712 | 2708 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
51bbfa0c | 2709 | } |
0a1c58a2 JL |
2710 | else |
2711 | { | |
2712 | /* Note that we must go through the motions of allocating an argument | |
2713 | block even if the size is zero because we may be storing args | |
2714 | in the area reserved for register arguments, which may be part of | |
2715 | the stack frame. */ | |
26a258fe | 2716 | |
099e9712 | 2717 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2718 | |
0a1c58a2 JL |
2719 | /* Store the maximum argument space used. It will be pushed by |
2720 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2721 | checking). */ | |
51bbfa0c | 2722 | |
0a1c58a2 JL |
2723 | if (needed > current_function_outgoing_args_size) |
2724 | current_function_outgoing_args_size = needed; | |
51bbfa0c | 2725 | |
0a1c58a2 JL |
2726 | if (must_preallocate) |
2727 | { | |
f73ad30e JH |
2728 | if (ACCUMULATE_OUTGOING_ARGS) |
2729 | { | |
f8a097cd JH |
2730 | /* Since the stack pointer will never be pushed, it is |
2731 | possible for the evaluation of a parm to clobber | |
2732 | something we have already written to the stack. | |
2733 | Since most function calls on RISC machines do not use | |
2734 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2735 | |
f73ad30e | 2736 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2737 | written and that we are using. Here we set up to do this |
2738 | by making a new stack usage map from the old one. The | |
f725a3ec | 2739 | actual save will be done by store_one_arg. |
26a258fe | 2740 | |
f73ad30e JH |
2741 | Another approach might be to try to reorder the argument |
2742 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2743 | |
e5e809f4 | 2744 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
f8a097cd JH |
2745 | /* Since we will be writing into the entire argument area, |
2746 | the map must be allocated for its entire size, not just | |
2747 | the part that is the responsibility of the caller. */ | |
f73ad30e | 2748 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2749 | #endif |
2750 | ||
2751 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2752 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2753 | needed + 1); | |
51bbfa0c | 2754 | #else |
f73ad30e JH |
2755 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2756 | needed); | |
51bbfa0c | 2757 | #endif |
f8a097cd JH |
2758 | stack_usage_map |
2759 | = (char *) alloca (highest_outgoing_arg_in_use); | |
51bbfa0c | 2760 | |
f73ad30e | 2761 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2762 | memcpy (stack_usage_map, initial_stack_usage_map, |
2763 | initial_highest_arg_in_use); | |
2f4aa534 | 2764 | |
f73ad30e | 2765 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2766 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2767 | (highest_outgoing_arg_in_use |
2768 | - initial_highest_arg_in_use)); | |
2769 | needed = 0; | |
2f4aa534 | 2770 | |
f8a097cd JH |
2771 | /* The address of the outgoing argument list must not be |
2772 | copied to a register here, because argblock would be left | |
2773 | pointing to the wrong place after the call to | |
f725a3ec | 2774 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2775 | |
f73ad30e | 2776 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2777 | } |
f73ad30e | 2778 | else |
26a258fe | 2779 | { |
f73ad30e | 2780 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2781 | { |
f73ad30e | 2782 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2783 | to get this space. */ |
2784 | needed | |
f725a3ec | 2785 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2786 | (unadjusted_args_size, |
099e9712 | 2787 | &adjusted_args_size, |
ce48579b RH |
2788 | preferred_unit_stack_boundary)); |
2789 | ||
2790 | /* combine_pending_stack_adjustment_and_call computes | |
2791 | an adjustment before the arguments are allocated. | |
2792 | Account for them and see whether or not the stack | |
2793 | needs to go up or down. */ | |
2794 | needed = unadjusted_args_size - needed; | |
2795 | ||
2796 | if (needed < 0) | |
f73ad30e | 2797 | { |
ce48579b RH |
2798 | /* We're releasing stack space. */ |
2799 | /* ??? We can avoid any adjustment at all if we're | |
2800 | already aligned. FIXME. */ | |
2801 | pending_stack_adjust = -needed; | |
2802 | do_pending_stack_adjust (); | |
f73ad30e JH |
2803 | needed = 0; |
2804 | } | |
f725a3ec | 2805 | else |
ce48579b RH |
2806 | /* We need to allocate space. We'll do that in |
2807 | push_block below. */ | |
2808 | pending_stack_adjust = 0; | |
0a1c58a2 | 2809 | } |
ce48579b RH |
2810 | |
2811 | /* Special case this because overhead of `push_block' in | |
2812 | this case is non-trivial. */ | |
f73ad30e JH |
2813 | if (needed == 0) |
2814 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2815 | else |
d892f288 DD |
2816 | { |
2817 | argblock = push_block (GEN_INT (needed), 0, 0); | |
2818 | #ifdef ARGS_GROW_DOWNWARD | |
2819 | argblock = plus_constant (argblock, needed); | |
2820 | #endif | |
2821 | } | |
f73ad30e | 2822 | |
f8a097cd JH |
2823 | /* We only really need to call `copy_to_reg' in the case |
2824 | where push insns are going to be used to pass ARGBLOCK | |
2825 | to a function call in ARGS. In that case, the stack | |
2826 | pointer changes value from the allocation point to the | |
2827 | call point, and hence the value of | |
2828 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2829 | as well always do it. */ | |
f73ad30e | 2830 | argblock = copy_to_reg (argblock); |
38afb23f OH |
2831 | } |
2832 | } | |
2833 | } | |
0a1c58a2 | 2834 | |
38afb23f OH |
2835 | if (ACCUMULATE_OUTGOING_ARGS) |
2836 | { | |
2837 | /* The save/restore code in store_one_arg handles all | |
2838 | cases except one: a constructor call (including a C | |
2839 | function returning a BLKmode struct) to initialize | |
2840 | an argument. */ | |
2841 | if (stack_arg_under_construction) | |
2842 | { | |
e5e809f4 | 2843 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
38afb23f OH |
2844 | rtx push_size = GEN_INT (reg_parm_stack_space |
2845 | + adjusted_args_size.constant); | |
bfbf933a | 2846 | #else |
38afb23f | 2847 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
bfbf933a | 2848 | #endif |
38afb23f OH |
2849 | if (old_stack_level == 0) |
2850 | { | |
2851 | emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2852 | NULL_RTX); | |
2853 | old_stack_pointer_delta = stack_pointer_delta; | |
2854 | old_pending_adj = pending_stack_adjust; | |
2855 | pending_stack_adjust = 0; | |
2856 | /* stack_arg_under_construction says whether a stack | |
2857 | arg is being constructed at the old stack level. | |
2858 | Pushing the stack gets a clean outgoing argument | |
2859 | block. */ | |
2860 | old_stack_arg_under_construction | |
2861 | = stack_arg_under_construction; | |
2862 | stack_arg_under_construction = 0; | |
2863 | /* Make a new map for the new argument list. */ | |
2864 | stack_usage_map = (char *) | |
2865 | alloca (highest_outgoing_arg_in_use); | |
2866 | memset (stack_usage_map, 0, highest_outgoing_arg_in_use); | |
2867 | highest_outgoing_arg_in_use = 0; | |
f73ad30e | 2868 | } |
38afb23f OH |
2869 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2870 | BITS_PER_UNIT); | |
0a1c58a2 | 2871 | } |
bfbf933a | 2872 | |
38afb23f OH |
2873 | /* If argument evaluation might modify the stack pointer, |
2874 | copy the address of the argument list to a register. */ | |
2875 | for (i = 0; i < num_actuals; i++) | |
2876 | if (args[i].pass_on_stack) | |
2877 | { | |
2878 | argblock = copy_addr_to_reg (argblock); | |
2879 | break; | |
2880 | } | |
2881 | } | |
d329e058 | 2882 | |
0a1c58a2 | 2883 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2884 | |
0a1c58a2 JL |
2885 | /* If we push args individually in reverse order, perform stack alignment |
2886 | before the first push (the last arg). */ | |
f73ad30e | 2887 | if (PUSH_ARGS_REVERSED && argblock == 0 |
099e9712 | 2888 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2889 | { |
0a1c58a2 JL |
2890 | /* When the stack adjustment is pending, we get better code |
2891 | by combining the adjustments. */ | |
f725a3ec | 2892 | if (pending_stack_adjust |
53d4257f | 2893 | && ! (flags & ECF_LIBCALL_BLOCK) |
0a1c58a2 | 2894 | && ! inhibit_defer_pop) |
ce48579b RH |
2895 | { |
2896 | pending_stack_adjust | |
f725a3ec | 2897 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2898 | (unadjusted_args_size, |
099e9712 | 2899 | &adjusted_args_size, |
ce48579b RH |
2900 | preferred_unit_stack_boundary)); |
2901 | do_pending_stack_adjust (); | |
2902 | } | |
0a1c58a2 | 2903 | else if (argblock == 0) |
099e9712 | 2904 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2905 | - unadjusted_args_size)); |
0a1c58a2 | 2906 | } |
ebcd0b57 JH |
2907 | /* Now that the stack is properly aligned, pops can't safely |
2908 | be deferred during the evaluation of the arguments. */ | |
2909 | NO_DEFER_POP; | |
51bbfa0c | 2910 | |
09e2bf48 | 2911 | funexp = rtx_for_function_call (fndecl, addr); |
51bbfa0c | 2912 | |
0a1c58a2 JL |
2913 | /* Figure out the register where the value, if any, will come back. */ |
2914 | valreg = 0; | |
2915 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2916 | && ! structure_value_addr) | |
2917 | { | |
2918 | if (pcc_struct_value) | |
2919 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
7d167afd | 2920 | fndecl, (pass == 0)); |
0a1c58a2 | 2921 | else |
7d167afd | 2922 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0)); |
0a1c58a2 | 2923 | } |
51bbfa0c | 2924 | |
0a1c58a2 JL |
2925 | /* Precompute all register parameters. It isn't safe to compute anything |
2926 | once we have started filling any specific hard regs. */ | |
2927 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 2928 | |
f73ad30e | 2929 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2930 | /* Save the fixed argument area if it's part of the caller's frame and |
2931 | is clobbered by argument setup for this call. */ | |
f8a097cd | 2932 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
2933 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2934 | &low_to_save, &high_to_save); | |
b94301c2 | 2935 | #endif |
51bbfa0c | 2936 | |
0a1c58a2 JL |
2937 | /* Now store (and compute if necessary) all non-register parms. |
2938 | These come before register parms, since they can require block-moves, | |
2939 | which could clobber the registers used for register parms. | |
2940 | Parms which have partial registers are not stored here, | |
2941 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 2942 | |
0a1c58a2 JL |
2943 | for (i = 0; i < num_actuals; i++) |
2944 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
c67846f2 JJ |
2945 | { |
2946 | rtx before_arg = get_last_insn (); | |
2947 | ||
4c6b3b2a JJ |
2948 | if (store_one_arg (&args[i], argblock, flags, |
2949 | adjusted_args_size.var != 0, | |
2950 | reg_parm_stack_space) | |
2951 | || (pass == 0 | |
2952 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2953 | &args[i], 1))) |
c67846f2 JJ |
2954 | sibcall_failure = 1; |
2955 | } | |
0a1c58a2 JL |
2956 | |
2957 | /* If we have a parm that is passed in registers but not in memory | |
2958 | and whose alignment does not permit a direct copy into registers, | |
2959 | make a group of pseudos that correspond to each register that we | |
2960 | will later fill. */ | |
2961 | if (STRICT_ALIGNMENT) | |
2962 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2963 | ||
2964 | /* Now store any partially-in-registers parm. | |
2965 | This is the last place a block-move can happen. */ | |
2966 | if (reg_parm_seen) | |
2967 | for (i = 0; i < num_actuals; i++) | |
2968 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 JJ |
2969 | { |
2970 | rtx before_arg = get_last_insn (); | |
2971 | ||
4c6b3b2a JJ |
2972 | if (store_one_arg (&args[i], argblock, flags, |
2973 | adjusted_args_size.var != 0, | |
2974 | reg_parm_stack_space) | |
2975 | || (pass == 0 | |
2976 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2977 | &args[i], 1))) |
c67846f2 JJ |
2978 | sibcall_failure = 1; |
2979 | } | |
51bbfa0c | 2980 | |
0a1c58a2 JL |
2981 | /* If we pushed args in forward order, perform stack alignment |
2982 | after pushing the last arg. */ | |
f73ad30e | 2983 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
099e9712 | 2984 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2985 | - unadjusted_args_size)); |
51bbfa0c | 2986 | |
0a1c58a2 JL |
2987 | /* If register arguments require space on the stack and stack space |
2988 | was not preallocated, allocate stack space here for arguments | |
2989 | passed in registers. */ | |
f73ad30e JH |
2990 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
2991 | if (!ACCUMULATE_OUTGOING_ARGS | |
f725a3ec | 2992 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 2993 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
2994 | #endif |
2995 | ||
0a1c58a2 JL |
2996 | /* Pass the function the address in which to return a |
2997 | structure value. */ | |
2998 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
2999 | { | |
f80f73e1 SE |
3000 | #ifdef POINTERS_EXTEND_UNSIGNED |
3001 | if (GET_MODE (structure_value_addr) != Pmode) | |
3002 | structure_value_addr = convert_memory_address | |
3003 | (Pmode, structure_value_addr); | |
3004 | #endif | |
0a1c58a2 JL |
3005 | emit_move_insn (struct_value_rtx, |
3006 | force_reg (Pmode, | |
3007 | force_operand (structure_value_addr, | |
3008 | NULL_RTX))); | |
3009 | ||
0a1c58a2 JL |
3010 | if (GET_CODE (struct_value_rtx) == REG) |
3011 | use_reg (&call_fusage, struct_value_rtx); | |
3012 | } | |
c2939b57 | 3013 | |
0a1c58a2 | 3014 | funexp = prepare_call_address (funexp, fndecl, &call_fusage, |
3affaf29 | 3015 | reg_parm_seen, pass == 0); |
51bbfa0c | 3016 | |
0cdca92b DJ |
3017 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
3018 | pass == 0, &sibcall_failure); | |
f725a3ec | 3019 | |
0a1c58a2 JL |
3020 | /* Perform postincrements before actually calling the function. */ |
3021 | emit_queue (); | |
51bbfa0c | 3022 | |
0a1c58a2 JL |
3023 | /* Save a pointer to the last insn before the call, so that we can |
3024 | later safely search backwards to find the CALL_INSN. */ | |
3025 | before_call = get_last_insn (); | |
51bbfa0c | 3026 | |
7d167afd JJ |
3027 | /* Set up next argument register. For sibling calls on machines |
3028 | with register windows this should be the incoming register. */ | |
3029 | #ifdef FUNCTION_INCOMING_ARG | |
3030 | if (pass == 0) | |
3031 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
3032 | void_type_node, 1); | |
3033 | else | |
3034 | #endif | |
3035 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
3036 | void_type_node, 1); | |
3037 | ||
0a1c58a2 JL |
3038 | /* All arguments and registers used for the call must be set up by |
3039 | now! */ | |
3040 | ||
ce48579b RH |
3041 | /* Stack must be properly aligned now. */ |
3042 | if (pass && stack_pointer_delta % preferred_unit_stack_boundary) | |
d9a7d592 | 3043 | abort (); |
ebcd0b57 | 3044 | |
0a1c58a2 JL |
3045 | /* Generate the actual call instruction. */ |
3046 | emit_call_1 (funexp, fndecl, funtype, unadjusted_args_size, | |
099e9712 | 3047 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 3048 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
fa5322fa | 3049 | flags, & args_so_far); |
0a1c58a2 JL |
3050 | |
3051 | /* If call is cse'able, make appropriate pair of reg-notes around it. | |
3052 | Test valreg so we don't crash; may safely ignore `const' | |
3053 | if return type is void. Disable for PARALLEL return values, because | |
3054 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 3055 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
9ae8ffe7 | 3056 | { |
0a1c58a2 | 3057 | rtx insns; |
9ae8ffe7 | 3058 | |
e4abc3d5 RH |
3059 | if (valreg == 0 || GET_CODE (valreg) == PARALLEL) |
3060 | { | |
3061 | insns = get_insns (); | |
3062 | end_sequence (); | |
2f937369 | 3063 | emit_insn (insns); |
e4abc3d5 RH |
3064 | } |
3065 | else | |
3066 | { | |
3067 | rtx note = 0; | |
3068 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3069 | ||
3070 | /* Mark the return value as a pointer if needed. */ | |
3071 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
3072 | mark_reg_pointer (temp, | |
3073 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); | |
3074 | ||
3075 | /* Construct an "equal form" for the value which mentions all the | |
3076 | arguments in order as well as the function name. */ | |
3077 | for (i = 0; i < num_actuals; i++) | |
3078 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3079 | args[i].initial_value, note); | |
3080 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); | |
3081 | ||
3082 | insns = get_insns (); | |
3083 | end_sequence (); | |
3084 | ||
3085 | if (flags & ECF_PURE) | |
3086 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3087 | gen_rtx_USE (VOIDmode, | |
3088 | gen_rtx_MEM (BLKmode, | |
3089 | gen_rtx_SCRATCH (VOIDmode))), | |
3090 | note); | |
3091 | ||
3092 | emit_libcall_block (insns, temp, valreg, note); | |
3093 | ||
3094 | valreg = temp; | |
3095 | } | |
0a1c58a2 | 3096 | } |
53d4257f | 3097 | else if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 JL |
3098 | { |
3099 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3100 | rtx last, insns; | |
3101 | ||
f725a3ec | 3102 | /* The return value from a malloc-like function is a pointer. */ |
0a1c58a2 | 3103 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
bdb429a5 | 3104 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
0a1c58a2 JL |
3105 | |
3106 | emit_move_insn (temp, valreg); | |
3107 | ||
3108 | /* The return value from a malloc-like function can not alias | |
3109 | anything else. */ | |
3110 | last = get_last_insn (); | |
f725a3ec | 3111 | REG_NOTES (last) = |
0a1c58a2 JL |
3112 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); |
3113 | ||
3114 | /* Write out the sequence. */ | |
3115 | insns = get_insns (); | |
3116 | end_sequence (); | |
2f937369 | 3117 | emit_insn (insns); |
0a1c58a2 JL |
3118 | valreg = temp; |
3119 | } | |
51bbfa0c | 3120 | |
0a1c58a2 JL |
3121 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3122 | if nonvolatile values are live. For functions that cannot return, | |
3123 | inform flow that control does not fall through. */ | |
51bbfa0c | 3124 | |
570a98eb | 3125 | if ((flags & (ECF_NORETURN | ECF_LONGJMP)) || pass == 0) |
c2939b57 | 3126 | { |
570a98eb | 3127 | /* The barrier must be emitted |
0a1c58a2 JL |
3128 | immediately after the CALL_INSN. Some ports emit more |
3129 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 3130 | |
0a1c58a2 JL |
3131 | rtx last = get_last_insn (); |
3132 | while (GET_CODE (last) != CALL_INSN) | |
3133 | { | |
3134 | last = PREV_INSN (last); | |
3135 | /* There was no CALL_INSN? */ | |
3136 | if (last == before_call) | |
3137 | abort (); | |
3138 | } | |
51bbfa0c | 3139 | |
570a98eb | 3140 | emit_barrier_after (last); |
8af61113 RS |
3141 | |
3142 | /* Stack adjustments after a noreturn call are dead code. */ | |
3143 | stack_pointer_delta = old_stack_allocated; | |
3144 | pending_stack_adjust = 0; | |
0a1c58a2 | 3145 | } |
51bbfa0c | 3146 | |
f2d33f13 | 3147 | if (flags & ECF_LONGJMP) |
099e9712 | 3148 | current_function_calls_longjmp = 1; |
51bbfa0c | 3149 | |
0a1c58a2 | 3150 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 3151 | |
0a1c58a2 JL |
3152 | /* If there are cleanups to be called, don't use a hard reg as target. |
3153 | We need to double check this and see if it matters anymore. */ | |
de1f5659 | 3154 | if (any_pending_cleanups ()) |
194c7c45 RH |
3155 | { |
3156 | if (target && REG_P (target) | |
3157 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
3158 | target = 0; | |
3159 | sibcall_failure = 1; | |
3160 | } | |
51bbfa0c | 3161 | |
0a1c58a2 JL |
3162 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
3163 | || ignore) | |
b5cd4ed4 | 3164 | target = const0_rtx; |
0a1c58a2 JL |
3165 | else if (structure_value_addr) |
3166 | { | |
3167 | if (target == 0 || GET_CODE (target) != MEM) | |
3168 | { | |
3bdf5ad1 RK |
3169 | target |
3170 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3171 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
3172 | structure_value_addr)); | |
3173 | set_mem_attributes (target, exp, 1); | |
0a1c58a2 JL |
3174 | } |
3175 | } | |
3176 | else if (pcc_struct_value) | |
cacbd532 | 3177 | { |
0a1c58a2 JL |
3178 | /* This is the special C++ case where we need to |
3179 | know what the true target was. We take care to | |
3180 | never use this value more than once in one expression. */ | |
3181 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3182 | copy_to_reg (valreg)); | |
3bdf5ad1 | 3183 | set_mem_attributes (target, exp, 1); |
cacbd532 | 3184 | } |
0a1c58a2 JL |
3185 | /* Handle calls that return values in multiple non-contiguous locations. |
3186 | The Irix 6 ABI has examples of this. */ | |
3187 | else if (GET_CODE (valreg) == PARALLEL) | |
3188 | { | |
0a1c58a2 JL |
3189 | if (target == 0) |
3190 | { | |
1da68f56 RK |
3191 | /* This will only be assigned once, so it can be readonly. */ |
3192 | tree nt = build_qualified_type (TREE_TYPE (exp), | |
3193 | (TYPE_QUALS (TREE_TYPE (exp)) | |
3194 | | TYPE_QUAL_CONST)); | |
3195 | ||
3196 | target = assign_temp (nt, 0, 1, 1); | |
0a1c58a2 JL |
3197 | preserve_temp_slots (target); |
3198 | } | |
3199 | ||
3200 | if (! rtx_equal_p (target, valreg)) | |
6e985040 | 3201 | emit_group_store (target, valreg, TREE_TYPE (exp), |
04050c69 | 3202 | int_size_in_bytes (TREE_TYPE (exp))); |
19caa751 | 3203 | |
0a1c58a2 JL |
3204 | /* We can not support sibling calls for this case. */ |
3205 | sibcall_failure = 1; | |
3206 | } | |
3207 | else if (target | |
3208 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
3209 | && GET_MODE (target) == GET_MODE (valreg)) | |
3210 | { | |
3211 | /* TARGET and VALREG cannot be equal at this point because the | |
3212 | latter would not have REG_FUNCTION_VALUE_P true, while the | |
3213 | former would if it were referring to the same register. | |
3214 | ||
3215 | If they refer to the same register, this move will be a no-op, | |
3216 | except when function inlining is being done. */ | |
3217 | emit_move_insn (target, valreg); | |
0219237c OH |
3218 | |
3219 | /* If we are setting a MEM, this code must be executed. Since it is | |
3220 | emitted after the call insn, sibcall optimization cannot be | |
3221 | performed in that case. */ | |
3222 | if (GET_CODE (target) == MEM) | |
3223 | sibcall_failure = 1; | |
0a1c58a2 JL |
3224 | } |
3225 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
8eb99146 RH |
3226 | { |
3227 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3228 | ||
3229 | /* We can not support sibling calls for this case. */ | |
3230 | sibcall_failure = 1; | |
3231 | } | |
0a1c58a2 JL |
3232 | else |
3233 | target = copy_to_reg (valreg); | |
51bbfa0c | 3234 | |
84b55618 | 3235 | #ifdef PROMOTE_FUNCTION_RETURN |
0a1c58a2 JL |
3236 | /* If we promoted this return value, make the proper SUBREG. TARGET |
3237 | might be const0_rtx here, so be careful. */ | |
3238 | if (GET_CODE (target) == REG | |
3239 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3240 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3241 | { | |
3242 | tree type = TREE_TYPE (exp); | |
3243 | int unsignedp = TREE_UNSIGNED (type); | |
ddef6bc7 | 3244 | int offset = 0; |
84b55618 | 3245 | |
0a1c58a2 JL |
3246 | /* If we don't promote as expected, something is wrong. */ |
3247 | if (GET_MODE (target) | |
3248 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
3249 | abort (); | |
5d2ac65e | 3250 | |
ddef6bc7 JJ |
3251 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) |
3252 | && GET_MODE_SIZE (GET_MODE (target)) | |
3253 | > GET_MODE_SIZE (TYPE_MODE (type))) | |
3254 | { | |
3255 | offset = GET_MODE_SIZE (GET_MODE (target)) | |
3256 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3257 | if (! BYTES_BIG_ENDIAN) | |
3258 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3259 | else if (! WORDS_BIG_ENDIAN) | |
3260 | offset %= UNITS_PER_WORD; | |
3261 | } | |
3262 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
0a1c58a2 | 3263 | SUBREG_PROMOTED_VAR_P (target) = 1; |
7879b81e | 3264 | SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); |
0a1c58a2 | 3265 | } |
84b55618 RK |
3266 | #endif |
3267 | ||
0a1c58a2 JL |
3268 | /* If size of args is variable or this was a constructor call for a stack |
3269 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3270 | |
7393c642 | 3271 | if (old_stack_level && ! (flags & ECF_SP_DEPRESSED)) |
0a1c58a2 JL |
3272 | { |
3273 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
38afb23f | 3274 | stack_pointer_delta = old_stack_pointer_delta; |
0a1c58a2 | 3275 | pending_stack_adjust = old_pending_adj; |
0a1c58a2 JL |
3276 | stack_arg_under_construction = old_stack_arg_under_construction; |
3277 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3278 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3279 | sibcall_failure = 1; |
3280 | } | |
f8a097cd | 3281 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3282 | { |
51bbfa0c | 3283 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 | 3284 | if (save_area) |
b820d2b8 AM |
3285 | restore_fixed_argument_area (save_area, argblock, |
3286 | high_to_save, low_to_save); | |
b94301c2 | 3287 | #endif |
51bbfa0c | 3288 | |
0a1c58a2 JL |
3289 | /* If we saved any argument areas, restore them. */ |
3290 | for (i = 0; i < num_actuals; i++) | |
3291 | if (args[i].save_area) | |
3292 | { | |
3293 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3294 | rtx stack_area | |
3295 | = gen_rtx_MEM (save_mode, | |
3296 | memory_address (save_mode, | |
3297 | XEXP (args[i].stack_slot, 0))); | |
3298 | ||
3299 | if (save_mode != BLKmode) | |
3300 | emit_move_insn (stack_area, args[i].save_area); | |
3301 | else | |
44bb111a | 3302 | emit_block_move (stack_area, args[i].save_area, |
e7949876 | 3303 | GEN_INT (args[i].locate.size.constant), |
44bb111a | 3304 | BLOCK_OP_CALL_PARM); |
0a1c58a2 | 3305 | } |
51bbfa0c | 3306 | |
0a1c58a2 JL |
3307 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3308 | stack_usage_map = initial_stack_usage_map; | |
3309 | } | |
51bbfa0c | 3310 | |
f725a3ec | 3311 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3312 | Check for the handler slots since we might not have a save area |
3313 | for non-local gotos. */ | |
59257ff7 | 3314 | |
f2d33f13 | 3315 | if ((flags & ECF_MAY_BE_ALLOCA) && nonlocal_goto_handler_slots != 0) |
0a1c58a2 | 3316 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
51bbfa0c | 3317 | |
0a1c58a2 JL |
3318 | /* Free up storage we no longer need. */ |
3319 | for (i = 0; i < num_actuals; ++i) | |
3320 | if (args[i].aligned_regs) | |
3321 | free (args[i].aligned_regs); | |
3322 | ||
e245d3af RH |
3323 | if (pass == 0) |
3324 | { | |
3325 | /* Undo the fake expand_start_target_temps we did earlier. If | |
3326 | there had been any cleanups created, we've already set | |
3327 | sibcall_failure. */ | |
3328 | expand_end_target_temps (); | |
3329 | } | |
3330 | ||
ee960939 OH |
3331 | /* If this function is returning into a memory location marked as |
3332 | readonly, it means it is initializing that location. We normally treat | |
3333 | functions as not clobbering such locations, so we need to specify that | |
3334 | this one does. We do this by adding the appropriate CLOBBER to the | |
3335 | CALL_INSN function usage list. This cannot be done by emitting a | |
3336 | standalone CLOBBER after the call because the latter would be ignored | |
3337 | by at least the delay slot scheduling pass. We do this now instead of | |
3338 | adding to call_fusage before the call to emit_call_1 because TARGET | |
3339 | may be modified in the meantime. */ | |
d329e058 | 3340 | if (structure_value_addr != 0 && target != 0 |
ee960939 OH |
3341 | && GET_CODE (target) == MEM && RTX_UNCHANGING_P (target)) |
3342 | add_function_usage_to | |
3343 | (last_call_insn (), | |
3344 | gen_rtx_EXPR_LIST (VOIDmode, gen_rtx_CLOBBER (VOIDmode, target), | |
3345 | NULL_RTX)); | |
d329e058 | 3346 | |
0a1c58a2 JL |
3347 | insns = get_insns (); |
3348 | end_sequence (); | |
3349 | ||
3350 | if (pass == 0) | |
3351 | { | |
3352 | tail_call_insns = insns; | |
3353 | ||
0a1c58a2 JL |
3354 | /* Restore the pending stack adjustment now that we have |
3355 | finished generating the sibling call sequence. */ | |
1503a7ec | 3356 | |
0a1c58a2 | 3357 | pending_stack_adjust = save_pending_stack_adjust; |
1503a7ec | 3358 | stack_pointer_delta = save_stack_pointer_delta; |
099e9712 JH |
3359 | |
3360 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3361 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3362 | { |
3363 | args[i].value = 0; | |
3364 | args[i].aligned_regs = 0; | |
3365 | args[i].stack = 0; | |
3366 | } | |
c67846f2 JJ |
3367 | |
3368 | sbitmap_free (stored_args_map); | |
0a1c58a2 JL |
3369 | } |
3370 | else | |
38afb23f OH |
3371 | { |
3372 | normal_call_insns = insns; | |
3373 | ||
3374 | /* Verify that we've deallocated all the stack we used. */ | |
8af61113 RS |
3375 | if (! (flags & (ECF_NORETURN | ECF_LONGJMP)) |
3376 | && old_stack_allocated != stack_pointer_delta | |
3377 | - pending_stack_adjust) | |
38afb23f OH |
3378 | abort (); |
3379 | } | |
fadb729c JJ |
3380 | |
3381 | /* If something prevents making this a sibling call, | |
3382 | zero out the sequence. */ | |
3383 | if (sibcall_failure) | |
3384 | tail_call_insns = NULL_RTX; | |
0a1c58a2 JL |
3385 | } |
3386 | ||
3387 | /* The function optimize_sibling_and_tail_recursive_calls doesn't | |
3388 | handle CALL_PLACEHOLDERs inside other CALL_PLACEHOLDERs. This | |
3389 | can happen if the arguments to this function call an inline | |
3390 | function who's expansion contains another CALL_PLACEHOLDER. | |
3391 | ||
3392 | If there are any C_Ps in any of these sequences, replace them | |
f725a3ec | 3393 | with their normal call. */ |
0a1c58a2 JL |
3394 | |
3395 | for (insn = normal_call_insns; insn; insn = NEXT_INSN (insn)) | |
3396 | if (GET_CODE (insn) == CALL_INSN | |
3397 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3398 | replace_call_placeholder (insn, sibcall_use_normal); | |
3399 | ||
3400 | for (insn = tail_call_insns; insn; insn = NEXT_INSN (insn)) | |
3401 | if (GET_CODE (insn) == CALL_INSN | |
3402 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3403 | replace_call_placeholder (insn, sibcall_use_normal); | |
3404 | ||
3405 | for (insn = tail_recursion_insns; insn; insn = NEXT_INSN (insn)) | |
3406 | if (GET_CODE (insn) == CALL_INSN | |
3407 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3408 | replace_call_placeholder (insn, sibcall_use_normal); | |
3409 | ||
3410 | /* If this was a potential tail recursion site, then emit a | |
3411 | CALL_PLACEHOLDER with the normal and the tail recursion streams. | |
3412 | One of them will be selected later. */ | |
3413 | if (tail_recursion_insns || tail_call_insns) | |
3414 | { | |
3415 | /* The tail recursion label must be kept around. We could expose | |
3416 | its use in the CALL_PLACEHOLDER, but that creates unwanted edges | |
3417 | and makes determining true tail recursion sites difficult. | |
3418 | ||
3419 | So we set LABEL_PRESERVE_P here, then clear it when we select | |
3420 | one of the call sequences after rtl generation is complete. */ | |
3421 | if (tail_recursion_insns) | |
3422 | LABEL_PRESERVE_P (tail_recursion_label) = 1; | |
3423 | emit_call_insn (gen_rtx_CALL_PLACEHOLDER (VOIDmode, normal_call_insns, | |
3424 | tail_call_insns, | |
3425 | tail_recursion_insns, | |
3426 | tail_recursion_label)); | |
3427 | } | |
3428 | else | |
2f937369 | 3429 | emit_insn (normal_call_insns); |
51bbfa0c | 3430 | |
0a1c58a2 | 3431 | currently_expanding_call--; |
8e6a59fe | 3432 | |
7393c642 RK |
3433 | /* If this function returns with the stack pointer depressed, ensure |
3434 | this block saves and restores the stack pointer, show it was | |
3435 | changed, and adjust for any outgoing arg space. */ | |
3436 | if (flags & ECF_SP_DEPRESSED) | |
3437 | { | |
3438 | clear_pending_stack_adjust (); | |
3439 | emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx)); | |
3440 | emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx); | |
3441 | save_stack_pointer (); | |
3442 | } | |
3443 | ||
51bbfa0c RS |
3444 | return target; |
3445 | } | |
ded9bf77 AH |
3446 | |
3447 | /* Traverse an argument list in VALUES and expand all complex | |
3448 | arguments into their components. */ | |
3449 | tree | |
3450 | split_complex_values (tree values) | |
3451 | { | |
3452 | tree p; | |
3453 | ||
3454 | values = copy_list (values); | |
3455 | ||
3456 | for (p = values; p; p = TREE_CHAIN (p)) | |
3457 | { | |
3458 | tree complex_value = TREE_VALUE (p); | |
3459 | tree complex_type; | |
3460 | ||
3461 | complex_type = TREE_TYPE (complex_value); | |
3462 | if (!complex_type) | |
3463 | continue; | |
3464 | ||
3465 | if (TREE_CODE (complex_type) == COMPLEX_TYPE) | |
3466 | { | |
3467 | tree subtype; | |
3468 | tree real, imag, next; | |
3469 | ||
3470 | subtype = TREE_TYPE (complex_type); | |
3471 | complex_value = save_expr (complex_value); | |
3472 | real = build1 (REALPART_EXPR, subtype, complex_value); | |
3473 | imag = build1 (IMAGPART_EXPR, subtype, complex_value); | |
3474 | ||
3475 | TREE_VALUE (p) = real; | |
3476 | next = TREE_CHAIN (p); | |
3477 | imag = build_tree_list (NULL_TREE, imag); | |
3478 | TREE_CHAIN (p) = imag; | |
3479 | TREE_CHAIN (imag) = next; | |
3480 | ||
3481 | /* Skip the newly created node. */ | |
3482 | p = TREE_CHAIN (p); | |
3483 | } | |
3484 | } | |
3485 | ||
3486 | return values; | |
3487 | } | |
3488 | ||
3489 | /* Traverse a list of TYPES and expand all complex types into their | |
3490 | components. */ | |
3491 | tree | |
3492 | split_complex_types (tree types) | |
3493 | { | |
3494 | tree p; | |
3495 | ||
3496 | types = copy_list (types); | |
3497 | ||
3498 | for (p = types; p; p = TREE_CHAIN (p)) | |
3499 | { | |
3500 | tree complex_type = TREE_VALUE (p); | |
3501 | ||
3502 | if (TREE_CODE (complex_type) == COMPLEX_TYPE) | |
3503 | { | |
3504 | tree next, imag; | |
3505 | ||
3506 | /* Rewrite complex type with component type. */ | |
3507 | TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3508 | next = TREE_CHAIN (p); | |
3509 | ||
3510 | /* Add another component type for the imaginary part. */ | |
3511 | imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3512 | TREE_CHAIN (p) = imag; | |
3513 | TREE_CHAIN (imag) = next; | |
3514 | ||
3515 | /* Skip the newly created node. */ | |
3516 | p = TREE_CHAIN (p); | |
3517 | } | |
3518 | } | |
3519 | ||
3520 | return types; | |
3521 | } | |
51bbfa0c | 3522 | \f |
de76b467 | 3523 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3524 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3525 | parameters are documented in the emit_library_call function below. */ |
8ac61af7 | 3526 | |
de76b467 | 3527 | static rtx |
d329e058 AJ |
3528 | emit_library_call_value_1 (int retval, rtx orgfun, rtx value, |
3529 | enum libcall_type fn_type, | |
3530 | enum machine_mode outmode, int nargs, va_list p) | |
43bc5f13 | 3531 | { |
3c0fca12 RH |
3532 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3533 | struct args_size args_size; | |
3534 | /* Size of arguments before any adjustments (such as rounding). */ | |
3535 | struct args_size original_args_size; | |
b3694847 | 3536 | int argnum; |
3c0fca12 RH |
3537 | rtx fun; |
3538 | int inc; | |
3539 | int count; | |
3c0fca12 RH |
3540 | rtx argblock = 0; |
3541 | CUMULATIVE_ARGS args_so_far; | |
f725a3ec KH |
3542 | struct arg |
3543 | { | |
3544 | rtx value; | |
3545 | enum machine_mode mode; | |
3546 | rtx reg; | |
3547 | int partial; | |
e7949876 | 3548 | struct locate_and_pad_arg_data locate; |
f725a3ec KH |
3549 | rtx save_area; |
3550 | }; | |
3c0fca12 RH |
3551 | struct arg *argvec; |
3552 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3553 | rtx call_fusage = 0; | |
3554 | rtx mem_value = 0; | |
5591ee6f | 3555 | rtx valreg; |
3c0fca12 RH |
3556 | int pcc_struct_value = 0; |
3557 | int struct_value_size = 0; | |
52a11cbf | 3558 | int flags; |
3c0fca12 | 3559 | int reg_parm_stack_space = 0; |
3c0fca12 | 3560 | int needed; |
695ee791 | 3561 | rtx before_call; |
b0c48229 | 3562 | tree tfom; /* type_for_mode (outmode, 0) */ |
3c0fca12 | 3563 | |
f73ad30e | 3564 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3565 | /* Define the boundary of the register parm stack space that needs to be |
3566 | save, if any. */ | |
b820d2b8 | 3567 | int low_to_save, high_to_save; |
f725a3ec | 3568 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3569 | #endif |
3570 | ||
3c0fca12 RH |
3571 | /* Size of the stack reserved for parameter registers. */ |
3572 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3573 | char *initial_stack_usage_map = stack_usage_map; | |
3c0fca12 RH |
3574 | |
3575 | #ifdef REG_PARM_STACK_SPACE | |
3576 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
3577 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
3578 | #else | |
3579 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); | |
3580 | #endif | |
3581 | #endif | |
3582 | ||
9555a122 | 3583 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3584 | flags = ECF_NOTHROW; |
3585 | ||
9555a122 RH |
3586 | switch (fn_type) |
3587 | { | |
3588 | case LCT_NORMAL: | |
53d4257f | 3589 | break; |
9555a122 | 3590 | case LCT_CONST: |
53d4257f JH |
3591 | flags |= ECF_CONST; |
3592 | break; | |
9555a122 | 3593 | case LCT_PURE: |
53d4257f | 3594 | flags |= ECF_PURE; |
9555a122 RH |
3595 | break; |
3596 | case LCT_CONST_MAKE_BLOCK: | |
53d4257f | 3597 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3598 | break; |
3599 | case LCT_PURE_MAKE_BLOCK: | |
53d4257f | 3600 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3601 | break; |
3602 | case LCT_NORETURN: | |
3603 | flags |= ECF_NORETURN; | |
3604 | break; | |
3605 | case LCT_THROW: | |
3606 | flags = ECF_NORETURN; | |
3607 | break; | |
9d98f8f9 JH |
3608 | case LCT_ALWAYS_RETURN: |
3609 | flags = ECF_ALWAYS_RETURN; | |
3610 | break; | |
9defc9b7 RH |
3611 | case LCT_RETURNS_TWICE: |
3612 | flags = ECF_RETURNS_TWICE; | |
3613 | break; | |
9555a122 | 3614 | } |
3c0fca12 RH |
3615 | fun = orgfun; |
3616 | ||
3c0fca12 RH |
3617 | /* Ensure current function's preferred stack boundary is at least |
3618 | what we need. */ | |
3619 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3620 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3c0fca12 RH |
3621 | |
3622 | /* If this kind of value comes back in memory, | |
3623 | decide where in memory it should come back. */ | |
b0c48229 | 3624 | if (outmode != VOIDmode) |
3c0fca12 | 3625 | { |
b0c48229 NB |
3626 | tfom = (*lang_hooks.types.type_for_mode) (outmode, 0); |
3627 | if (aggregate_value_p (tfom)) | |
3628 | { | |
3c0fca12 | 3629 | #ifdef PCC_STATIC_STRUCT_RETURN |
b0c48229 NB |
3630 | rtx pointer_reg |
3631 | = hard_function_value (build_pointer_type (tfom), 0, 0); | |
3632 | mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3633 | pcc_struct_value = 1; | |
3634 | if (value == 0) | |
3635 | value = gen_reg_rtx (outmode); | |
3c0fca12 | 3636 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
b0c48229 NB |
3637 | struct_value_size = GET_MODE_SIZE (outmode); |
3638 | if (value != 0 && GET_CODE (value) == MEM) | |
3639 | mem_value = value; | |
3640 | else | |
3641 | mem_value = assign_temp (tfom, 0, 1, 1); | |
3c0fca12 | 3642 | #endif |
b0c48229 NB |
3643 | /* This call returns a big structure. */ |
3644 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3645 | } | |
3c0fca12 | 3646 | } |
b0c48229 NB |
3647 | else |
3648 | tfom = void_type_node; | |
3c0fca12 RH |
3649 | |
3650 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3651 | ||
3652 | /* Copy all the libcall-arguments out of the varargs data | |
3653 | and into a vector ARGVEC. | |
3654 | ||
3655 | Compute how to pass each argument. We only support a very small subset | |
3656 | of the full argument passing conventions to limit complexity here since | |
3657 | library functions shouldn't have many args. */ | |
3658 | ||
3659 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
961192e1 | 3660 | memset ((char *) argvec, 0, (nargs + 1) * sizeof (struct arg)); |
3c0fca12 | 3661 | |
97fc4caf AO |
3662 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3663 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3664 | #else | |
3c0fca12 | 3665 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0); |
97fc4caf | 3666 | #endif |
3c0fca12 RH |
3667 | |
3668 | args_size.constant = 0; | |
3669 | args_size.var = 0; | |
3670 | ||
3671 | count = 0; | |
3672 | ||
ebb1b59a BS |
3673 | /* Now we are about to start emitting insns that can be deleted |
3674 | if a libcall is deleted. */ | |
53d4257f | 3675 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a BS |
3676 | start_sequence (); |
3677 | ||
3c0fca12 RH |
3678 | push_temp_slots (); |
3679 | ||
3680 | /* If there's a structure value address to be passed, | |
3681 | either pass it in the special place, or pass it as an extra argument. */ | |
3682 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) | |
3683 | { | |
3684 | rtx addr = XEXP (mem_value, 0); | |
3685 | nargs++; | |
3686 | ||
3687 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3688 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
3689 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3690 | addr = force_operand (addr, NULL_RTX); | |
3691 | ||
3692 | argvec[count].value = addr; | |
3693 | argvec[count].mode = Pmode; | |
3694 | argvec[count].partial = 0; | |
3695 | ||
3696 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
3697 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3698 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) | |
3699 | abort (); | |
3700 | #endif | |
3701 | ||
3702 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f CM |
3703 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3704 | 1, | |
3705 | #else | |
3706 | argvec[count].reg != 0, | |
3707 | #endif | |
e7949876 | 3708 | 0, NULL_TREE, &args_size, &argvec[count].locate); |
3c0fca12 | 3709 | |
3c0fca12 RH |
3710 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3711 | || reg_parm_stack_space > 0) | |
e7949876 | 3712 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3713 | |
3714 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3715 | ||
3716 | count++; | |
3717 | } | |
3718 | ||
3719 | for (; count < nargs; count++) | |
3720 | { | |
3721 | rtx val = va_arg (p, rtx); | |
3722 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3723 | ||
3724 | /* We cannot convert the arg value to the mode the library wants here; | |
3725 | must do it earlier where we know the signedness of the arg. */ | |
3726 | if (mode == BLKmode | |
3727 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
3728 | abort (); | |
3729 | ||
3730 | /* On some machines, there's no way to pass a float to a library fcn. | |
3731 | Pass it as a double instead. */ | |
3732 | #ifdef LIBGCC_NEEDS_DOUBLE | |
3733 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
3734 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; | |
3735 | #endif | |
3736 | ||
3737 | /* There's no need to call protect_from_queue, because | |
3738 | either emit_move_insn or emit_push_insn will do that. */ | |
3739 | ||
3740 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3741 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
3742 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3743 | val = force_operand (val, NULL_RTX); | |
3744 | ||
3745 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
3746 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
3747 | { | |
f474c6f8 AO |
3748 | rtx slot; |
3749 | int must_copy = 1 | |
d329e058 | 3750 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
f474c6f8 AO |
3751 | && ! FUNCTION_ARG_CALLEE_COPIES (args_so_far, mode, |
3752 | NULL_TREE, 1) | |
3753 | #endif | |
3754 | ; | |
3755 | ||
a0dc500c R |
3756 | /* loop.c won't look at CALL_INSN_FUNCTION_USAGE of const/pure |
3757 | functions, so we have to pretend this isn't such a function. */ | |
3758 | if (flags & ECF_LIBCALL_BLOCK) | |
3759 | { | |
3760 | rtx insns = get_insns (); | |
3761 | end_sequence (); | |
3762 | emit_insn (insns); | |
3763 | } | |
3764 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3765 | ||
99a32567 DM |
3766 | /* If this was a CONST function, it is now PURE since |
3767 | it now reads memory. */ | |
3768 | if (flags & ECF_CONST) | |
3769 | { | |
3770 | flags &= ~ECF_CONST; | |
3771 | flags |= ECF_PURE; | |
3772 | } | |
3773 | ||
f474c6f8 AO |
3774 | if (GET_MODE (val) == MEM && ! must_copy) |
3775 | slot = val; | |
3776 | else if (must_copy) | |
3777 | { | |
b0c48229 NB |
3778 | slot = assign_temp ((*lang_hooks.types.type_for_mode) (mode, 0), |
3779 | 0, 1, 1); | |
f474c6f8 AO |
3780 | emit_move_insn (slot, val); |
3781 | } | |
3782 | else | |
3783 | { | |
b0c48229 | 3784 | tree type = (*lang_hooks.types.type_for_mode) (mode, 0); |
f474c6f8 | 3785 | |
546ff777 AM |
3786 | slot |
3787 | = gen_rtx_MEM (mode, | |
3788 | expand_expr (build1 (ADDR_EXPR, | |
3789 | build_pointer_type (type), | |
3790 | make_tree (type, val)), | |
3791 | NULL_RTX, VOIDmode, 0)); | |
f474c6f8 | 3792 | } |
1da68f56 | 3793 | |
6b5273c3 AO |
3794 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3795 | gen_rtx_USE (VOIDmode, slot), | |
3796 | call_fusage); | |
f474c6f8 AO |
3797 | if (must_copy) |
3798 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3799 | gen_rtx_CLOBBER (VOIDmode, | |
3800 | slot), | |
3801 | call_fusage); | |
3802 | ||
3c0fca12 | 3803 | mode = Pmode; |
f474c6f8 | 3804 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 RH |
3805 | } |
3806 | #endif | |
3807 | ||
3808 | argvec[count].value = val; | |
3809 | argvec[count].mode = mode; | |
3810 | ||
3811 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3812 | ||
3813 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3814 | argvec[count].partial | |
3815 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
3816 | #else | |
3817 | argvec[count].partial = 0; | |
3818 | #endif | |
3819 | ||
3820 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3821 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
f725a3ec | 3822 | 1, |
a4d5044f CM |
3823 | #else |
3824 | argvec[count].reg != 0, | |
3825 | #endif | |
e7949876 AM |
3826 | argvec[count].partial, |
3827 | NULL_TREE, &args_size, &argvec[count].locate); | |
3c0fca12 | 3828 | |
e7949876 | 3829 | if (argvec[count].locate.size.var) |
3c0fca12 RH |
3830 | abort (); |
3831 | ||
3c0fca12 RH |
3832 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3833 | || reg_parm_stack_space > 0) | |
e7949876 | 3834 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3835 | |
3836 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3837 | } | |
3c0fca12 RH |
3838 | |
3839 | #ifdef FINAL_REG_PARM_STACK_SPACE | |
3840 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
3841 | args_size.var); | |
3842 | #endif | |
3843 | /* If this machine requires an external definition for library | |
3844 | functions, write one out. */ | |
3845 | assemble_external_libcall (fun); | |
3846 | ||
3847 | original_args_size = args_size; | |
1503a7ec JH |
3848 | args_size.constant = (((args_size.constant |
3849 | + stack_pointer_delta | |
3850 | + STACK_BYTES - 1) | |
3851 | / STACK_BYTES | |
3852 | * STACK_BYTES) | |
3853 | - stack_pointer_delta); | |
3c0fca12 RH |
3854 | |
3855 | args_size.constant = MAX (args_size.constant, | |
3856 | reg_parm_stack_space); | |
3857 | ||
3858 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3859 | args_size.constant -= reg_parm_stack_space; | |
3860 | #endif | |
3861 | ||
3862 | if (args_size.constant > current_function_outgoing_args_size) | |
3863 | current_function_outgoing_args_size = args_size.constant; | |
3864 | ||
f73ad30e JH |
3865 | if (ACCUMULATE_OUTGOING_ARGS) |
3866 | { | |
3867 | /* Since the stack pointer will never be pushed, it is possible for | |
3868 | the evaluation of a parm to clobber something we have already | |
3869 | written to the stack. Since most function calls on RISC machines | |
3870 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3871 | |
f73ad30e JH |
3872 | Therefore, we save any area of the stack that was already written |
3873 | and that we are using. Here we set up to do this by making a new | |
3874 | stack usage map from the old one. | |
3c0fca12 | 3875 | |
f73ad30e JH |
3876 | Another approach might be to try to reorder the argument |
3877 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3878 | |
f73ad30e | 3879 | needed = args_size.constant; |
3c0fca12 RH |
3880 | |
3881 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
f73ad30e JH |
3882 | /* Since we will be writing into the entire argument area, the |
3883 | map must be allocated for its entire size, not just the part that | |
3884 | is the responsibility of the caller. */ | |
3885 | needed += reg_parm_stack_space; | |
3c0fca12 RH |
3886 | #endif |
3887 | ||
3888 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3889 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3890 | needed + 1); | |
3c0fca12 | 3891 | #else |
f73ad30e JH |
3892 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3893 | needed); | |
3c0fca12 | 3894 | #endif |
f73ad30e | 3895 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); |
3c0fca12 | 3896 | |
f73ad30e | 3897 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3898 | memcpy (stack_usage_map, initial_stack_usage_map, |
3899 | initial_highest_arg_in_use); | |
3c0fca12 | 3900 | |
f73ad30e | 3901 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3902 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3903 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3904 | needed = 0; | |
3c0fca12 | 3905 | |
c39ada04 DD |
3906 | /* We must be careful to use virtual regs before they're instantiated, |
3907 | and real regs afterwards. Loop optimization, for example, can create | |
3908 | new libcalls after we've instantiated the virtual regs, and if we | |
3909 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3910 | |
c39ada04 DD |
3911 | if (virtuals_instantiated) |
3912 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3913 | else | |
3914 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3915 | } |
3916 | else | |
3917 | { | |
3918 | if (!PUSH_ARGS) | |
3919 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3920 | } | |
3c0fca12 | 3921 | |
3c0fca12 RH |
3922 | /* If we push args individually in reverse order, perform stack alignment |
3923 | before the first push (the last arg). */ | |
f73ad30e | 3924 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3925 | anti_adjust_stack (GEN_INT (args_size.constant |
3926 | - original_args_size.constant)); | |
3c0fca12 | 3927 | |
f73ad30e JH |
3928 | if (PUSH_ARGS_REVERSED) |
3929 | { | |
3930 | inc = -1; | |
3931 | argnum = nargs - 1; | |
3932 | } | |
3933 | else | |
3934 | { | |
3935 | inc = 1; | |
3936 | argnum = 0; | |
3937 | } | |
3c0fca12 | 3938 | |
f73ad30e JH |
3939 | #ifdef REG_PARM_STACK_SPACE |
3940 | if (ACCUMULATE_OUTGOING_ARGS) | |
3941 | { | |
3942 | /* The argument list is the property of the called routine and it | |
3943 | may clobber it. If the fixed area has been used for previous | |
b820d2b8 AM |
3944 | parameters, we must save and restore it. */ |
3945 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3946 | &low_to_save, &high_to_save); | |
3c0fca12 RH |
3947 | } |
3948 | #endif | |
f725a3ec | 3949 | |
3c0fca12 RH |
3950 | /* Push the args that need to be pushed. */ |
3951 | ||
3952 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3953 | are to be pushed. */ | |
3954 | for (count = 0; count < nargs; count++, argnum += inc) | |
3955 | { | |
b3694847 SS |
3956 | enum machine_mode mode = argvec[argnum].mode; |
3957 | rtx val = argvec[argnum].value; | |
3c0fca12 RH |
3958 | rtx reg = argvec[argnum].reg; |
3959 | int partial = argvec[argnum].partial; | |
f73ad30e | 3960 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3961 | |
3962 | if (! (reg != 0 && partial == 0)) | |
3963 | { | |
f73ad30e JH |
3964 | if (ACCUMULATE_OUTGOING_ARGS) |
3965 | { | |
f8a097cd JH |
3966 | /* If this is being stored into a pre-allocated, fixed-size, |
3967 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3968 | |
3969 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3970 | /* stack_slot is negative, but we want to index stack_usage_map |
3971 | with positive values. */ | |
e7949876 AM |
3972 | upper_bound = -argvec[argnum].locate.offset.constant + 1; |
3973 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; | |
3c0fca12 | 3974 | #else |
e7949876 AM |
3975 | lower_bound = argvec[argnum].locate.offset.constant; |
3976 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; | |
3c0fca12 RH |
3977 | #endif |
3978 | ||
546ff777 AM |
3979 | i = lower_bound; |
3980 | /* Don't worry about things in the fixed argument area; | |
3981 | it has already been saved. */ | |
3982 | if (i < reg_parm_stack_space) | |
3983 | i = reg_parm_stack_space; | |
3984 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3985 | i++; | |
3c0fca12 | 3986 | |
546ff777 | 3987 | if (i < upper_bound) |
f73ad30e | 3988 | { |
e7949876 AM |
3989 | /* We need to make a save area. */ |
3990 | unsigned int size | |
3991 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
f73ad30e | 3992 | enum machine_mode save_mode |
e7949876 AM |
3993 | = mode_for_size (size, MODE_INT, 1); |
3994 | rtx adr | |
3995 | = plus_constant (argblock, | |
3996 | argvec[argnum].locate.offset.constant); | |
f73ad30e | 3997 | rtx stack_area |
e7949876 | 3998 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
f73ad30e JH |
3999 | argvec[argnum].save_area = gen_reg_rtx (save_mode); |
4000 | ||
4001 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
4002 | } | |
3c0fca12 | 4003 | } |
19caa751 | 4004 | |
44bb111a RH |
4005 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, PARM_BOUNDARY, |
4006 | partial, reg, 0, argblock, | |
e7949876 AM |
4007 | GEN_INT (argvec[argnum].locate.offset.constant), |
4008 | reg_parm_stack_space, | |
4009 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3c0fca12 | 4010 | |
3c0fca12 | 4011 | /* Now mark the segment we just used. */ |
f73ad30e JH |
4012 | if (ACCUMULATE_OUTGOING_ARGS) |
4013 | for (i = lower_bound; i < upper_bound; i++) | |
4014 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
4015 | |
4016 | NO_DEFER_POP; | |
4017 | } | |
4018 | } | |
4019 | ||
3c0fca12 RH |
4020 | /* If we pushed args in forward order, perform stack alignment |
4021 | after pushing the last arg. */ | |
f73ad30e | 4022 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
3c0fca12 RH |
4023 | anti_adjust_stack (GEN_INT (args_size.constant |
4024 | - original_args_size.constant)); | |
3c0fca12 | 4025 | |
f73ad30e JH |
4026 | if (PUSH_ARGS_REVERSED) |
4027 | argnum = nargs - 1; | |
4028 | else | |
4029 | argnum = 0; | |
3c0fca12 | 4030 | |
3affaf29 | 4031 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0, 0); |
3c0fca12 RH |
4032 | |
4033 | /* Now load any reg parms into their regs. */ | |
4034 | ||
4035 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
4036 | are to be pushed. */ | |
4037 | for (count = 0; count < nargs; count++, argnum += inc) | |
4038 | { | |
b3694847 | 4039 | rtx val = argvec[argnum].value; |
3c0fca12 RH |
4040 | rtx reg = argvec[argnum].reg; |
4041 | int partial = argvec[argnum].partial; | |
4042 | ||
4043 | /* Handle calls that pass values in multiple non-contiguous | |
4044 | locations. The PA64 has examples of this for library calls. */ | |
4045 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
6e985040 | 4046 | emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (GET_MODE (val))); |
3c0fca12 RH |
4047 | else if (reg != 0 && partial == 0) |
4048 | emit_move_insn (reg, val); | |
4049 | ||
4050 | NO_DEFER_POP; | |
4051 | } | |
4052 | ||
3c0fca12 RH |
4053 | /* Any regs containing parms remain in use through the call. */ |
4054 | for (count = 0; count < nargs; count++) | |
4055 | { | |
4056 | rtx reg = argvec[count].reg; | |
4057 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
4058 | use_group_regs (&call_fusage, reg); | |
4059 | else if (reg != 0) | |
4060 | use_reg (&call_fusage, reg); | |
4061 | } | |
4062 | ||
4063 | /* Pass the function the address in which to return a structure value. */ | |
4064 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) | |
4065 | { | |
4066 | emit_move_insn (struct_value_rtx, | |
4067 | force_reg (Pmode, | |
4068 | force_operand (XEXP (mem_value, 0), | |
4069 | NULL_RTX))); | |
4070 | if (GET_CODE (struct_value_rtx) == REG) | |
f725a3ec | 4071 | use_reg (&call_fusage, struct_value_rtx); |
3c0fca12 RH |
4072 | } |
4073 | ||
4074 | /* Don't allow popping to be deferred, since then | |
4075 | cse'ing of library calls could delete a call and leave the pop. */ | |
4076 | NO_DEFER_POP; | |
5591ee6f JH |
4077 | valreg = (mem_value == 0 && outmode != VOIDmode |
4078 | ? hard_libcall_value (outmode) : NULL_RTX); | |
3c0fca12 | 4079 | |
ce48579b | 4080 | /* Stack must be properly aligned now. */ |
ebcd0b57 | 4081 | if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)) |
f725a3ec | 4082 | abort (); |
ebcd0b57 | 4083 | |
695ee791 RH |
4084 | before_call = get_last_insn (); |
4085 | ||
3c0fca12 RH |
4086 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
4087 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
4088 | /* The return type is needed to decide how many bytes the function pops. |
4089 | Signedness plays no role in that, so for simplicity, we pretend it's | |
4090 | always signed. We also assume that the list of arguments passed has | |
4091 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 4092 | |
f725a3ec KH |
4093 | emit_call_1 (fun, |
4094 | get_identifier (XSTR (orgfun, 0)), | |
b0c48229 | 4095 | build_function_type (tfom, NULL_TREE), |
f725a3ec | 4096 | original_args_size.constant, args_size.constant, |
3c0fca12 RH |
4097 | struct_value_size, |
4098 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
5591ee6f | 4099 | valreg, |
fa5322fa | 4100 | old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); |
3c0fca12 | 4101 | |
695ee791 RH |
4102 | /* For calls to `setjmp', etc., inform flow.c it should complain |
4103 | if nonvolatile values are live. For functions that cannot return, | |
4104 | inform flow that control does not fall through. */ | |
4105 | ||
570a98eb | 4106 | if (flags & (ECF_NORETURN | ECF_LONGJMP)) |
695ee791 | 4107 | { |
570a98eb | 4108 | /* The barrier note must be emitted |
695ee791 RH |
4109 | immediately after the CALL_INSN. Some ports emit more than |
4110 | just a CALL_INSN above, so we must search for it here. */ | |
4111 | ||
4112 | rtx last = get_last_insn (); | |
4113 | while (GET_CODE (last) != CALL_INSN) | |
4114 | { | |
4115 | last = PREV_INSN (last); | |
4116 | /* There was no CALL_INSN? */ | |
4117 | if (last == before_call) | |
4118 | abort (); | |
4119 | } | |
4120 | ||
570a98eb | 4121 | emit_barrier_after (last); |
695ee791 RH |
4122 | } |
4123 | ||
3c0fca12 RH |
4124 | /* Now restore inhibit_defer_pop to its actual original value. */ |
4125 | OK_DEFER_POP; | |
4126 | ||
ebb1b59a BS |
4127 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
4128 | Test valreg so we don't crash; may safely ignore `const' | |
4129 | if return type is void. Disable for PARALLEL return values, because | |
4130 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 4131 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a | 4132 | { |
ebb1b59a | 4133 | rtx insns; |
ebb1b59a | 4134 | |
c3297561 | 4135 | if (valreg == 0) |
e4abc3d5 RH |
4136 | { |
4137 | insns = get_insns (); | |
4138 | end_sequence (); | |
2f937369 | 4139 | emit_insn (insns); |
e4abc3d5 RH |
4140 | } |
4141 | else | |
4142 | { | |
4143 | rtx note = 0; | |
c3297561 | 4144 | rtx temp; |
e4abc3d5 | 4145 | int i; |
ebb1b59a | 4146 | |
c3297561 AO |
4147 | if (GET_CODE (valreg) == PARALLEL) |
4148 | { | |
4149 | temp = gen_reg_rtx (outmode); | |
6e985040 | 4150 | emit_group_store (temp, valreg, NULL_TREE, outmode); |
c3297561 AO |
4151 | valreg = temp; |
4152 | } | |
4153 | ||
4154 | temp = gen_reg_rtx (GET_MODE (valreg)); | |
4155 | ||
e4abc3d5 RH |
4156 | /* Construct an "equal form" for the value which mentions all the |
4157 | arguments in order as well as the function name. */ | |
4158 | for (i = 0; i < nargs; i++) | |
4159 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
4160 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
ebb1b59a | 4161 | |
e4abc3d5 RH |
4162 | insns = get_insns (); |
4163 | end_sequence (); | |
ebb1b59a | 4164 | |
e4abc3d5 RH |
4165 | if (flags & ECF_PURE) |
4166 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
4167 | gen_rtx_USE (VOIDmode, | |
4168 | gen_rtx_MEM (BLKmode, | |
4169 | gen_rtx_SCRATCH (VOIDmode))), | |
4170 | note); | |
4171 | ||
4172 | emit_libcall_block (insns, temp, valreg, note); | |
ebb1b59a | 4173 | |
e4abc3d5 RH |
4174 | valreg = temp; |
4175 | } | |
ebb1b59a | 4176 | } |
3c0fca12 RH |
4177 | pop_temp_slots (); |
4178 | ||
4179 | /* Copy the value to the right place. */ | |
de76b467 | 4180 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
4181 | { |
4182 | if (mem_value) | |
4183 | { | |
4184 | if (value == 0) | |
4185 | value = mem_value; | |
4186 | if (value != mem_value) | |
4187 | emit_move_insn (value, mem_value); | |
4188 | } | |
c3297561 AO |
4189 | else if (GET_CODE (valreg) == PARALLEL) |
4190 | { | |
4191 | if (value == 0) | |
4192 | value = gen_reg_rtx (outmode); | |
6e985040 | 4193 | emit_group_store (value, valreg, NULL_TREE, outmode); |
c3297561 | 4194 | } |
3c0fca12 | 4195 | else if (value != 0) |
d57551c7 | 4196 | emit_move_insn (value, valreg); |
3c0fca12 | 4197 | else |
d57551c7 | 4198 | value = valreg; |
3c0fca12 RH |
4199 | } |
4200 | ||
f73ad30e | 4201 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 4202 | { |
f73ad30e JH |
4203 | #ifdef REG_PARM_STACK_SPACE |
4204 | if (save_area) | |
b820d2b8 AM |
4205 | restore_fixed_argument_area (save_area, argblock, |
4206 | high_to_save, low_to_save); | |
3c0fca12 | 4207 | #endif |
f725a3ec | 4208 | |
f73ad30e JH |
4209 | /* If we saved any argument areas, restore them. */ |
4210 | for (count = 0; count < nargs; count++) | |
4211 | if (argvec[count].save_area) | |
4212 | { | |
4213 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
e7949876 AM |
4214 | rtx adr = plus_constant (argblock, |
4215 | argvec[count].locate.offset.constant); | |
4216 | rtx stack_area = gen_rtx_MEM (save_mode, | |
4217 | memory_address (save_mode, adr)); | |
f73ad30e JH |
4218 | |
4219 | emit_move_insn (stack_area, argvec[count].save_area); | |
4220 | } | |
3c0fca12 | 4221 | |
f73ad30e JH |
4222 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4223 | stack_usage_map = initial_stack_usage_map; | |
4224 | } | |
43bc5f13 | 4225 | |
de76b467 JH |
4226 | return value; |
4227 | ||
4228 | } | |
4229 | \f | |
4230 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4231 | (emitting the queue unless NO_QUEUE is nonzero), | |
4232 | for a value of mode OUTMODE, | |
4233 | with NARGS different arguments, passed as alternating rtx values | |
4234 | and machine_modes to convert them to. | |
4235 | The rtx values should have been passed through protect_from_queue already. | |
4236 | ||
1258ee80 JJ |
4237 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for `const' |
4238 | calls, LCT_PURE for `pure' calls, LCT_CONST_MAKE_BLOCK for `const' calls | |
4239 | which should be enclosed in REG_LIBCALL/REG_RETVAL notes, | |
4240 | LCT_PURE_MAKE_BLOCK for `purep' calls which should be enclosed in | |
4241 | REG_LIBCALL/REG_RETVAL notes with extra (use (memory (scratch)), | |
4242 | or other LCT_ value for other types of library calls. */ | |
de76b467 JH |
4243 | |
4244 | void | |
e34d07f2 KG |
4245 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
4246 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4247 | { |
e34d07f2 | 4248 | va_list p; |
d329e058 | 4249 | |
e34d07f2 | 4250 | va_start (p, nargs); |
2a8f6b90 | 4251 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
e34d07f2 | 4252 | va_end (p); |
de76b467 JH |
4253 | } |
4254 | \f | |
4255 | /* Like emit_library_call except that an extra argument, VALUE, | |
4256 | comes second and says where to store the result. | |
4257 | (If VALUE is zero, this function chooses a convenient way | |
4258 | to return the value. | |
4259 | ||
4260 | This function returns an rtx for where the value is to be found. | |
4261 | If VALUE is nonzero, VALUE is returned. */ | |
4262 | ||
4263 | rtx | |
e34d07f2 KG |
4264 | emit_library_call_value (rtx orgfun, rtx value, |
4265 | enum libcall_type fn_type, | |
4266 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4267 | { |
6268b922 | 4268 | rtx result; |
e34d07f2 | 4269 | va_list p; |
d329e058 | 4270 | |
e34d07f2 | 4271 | va_start (p, nargs); |
6268b922 KG |
4272 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
4273 | nargs, p); | |
e34d07f2 | 4274 | va_end (p); |
de76b467 | 4275 | |
6268b922 | 4276 | return result; |
322e3e34 RK |
4277 | } |
4278 | \f | |
51bbfa0c RS |
4279 | /* Store a single argument for a function call |
4280 | into the register or memory area where it must be passed. | |
4281 | *ARG describes the argument value and where to pass it. | |
4282 | ||
4283 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 4284 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
4285 | |
4286 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 4287 | so must be careful about how the stack is used. |
51bbfa0c RS |
4288 | |
4289 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4290 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4291 | that we need not worry about saving and restoring the stack. | |
4292 | ||
4c6b3b2a | 4293 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 4294 | |
da7d8304 | 4295 | Return nonzero if this arg should cause sibcall failure, |
4c6b3b2a | 4296 | zero otherwise. */ |
51bbfa0c | 4297 | |
4c6b3b2a | 4298 | static int |
d329e058 AJ |
4299 | store_one_arg (struct arg_data *arg, rtx argblock, int flags, |
4300 | int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
51bbfa0c | 4301 | { |
b3694847 | 4302 | tree pval = arg->tree_value; |
51bbfa0c RS |
4303 | rtx reg = 0; |
4304 | int partial = 0; | |
4305 | int used = 0; | |
6a651371 | 4306 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 4307 | int sibcall_failure = 0; |
51bbfa0c RS |
4308 | |
4309 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4310 | return 1; |
51bbfa0c | 4311 | |
cc79451b RK |
4312 | /* Push a new temporary level for any temporaries we make for |
4313 | this argument. */ | |
4314 | push_temp_slots (); | |
4315 | ||
f8a097cd | 4316 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4317 | { |
f73ad30e JH |
4318 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4319 | save any previous data at that location. */ | |
4320 | if (argblock && ! variable_size && arg->stack) | |
4321 | { | |
51bbfa0c | 4322 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4323 | /* stack_slot is negative, but we want to index stack_usage_map |
4324 | with positive values. */ | |
4325 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4326 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4327 | else | |
4328 | upper_bound = 0; | |
51bbfa0c | 4329 | |
e7949876 | 4330 | lower_bound = upper_bound - arg->locate.size.constant; |
51bbfa0c | 4331 | #else |
f73ad30e JH |
4332 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4333 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4334 | else | |
4335 | lower_bound = 0; | |
51bbfa0c | 4336 | |
e7949876 | 4337 | upper_bound = lower_bound + arg->locate.size.constant; |
51bbfa0c RS |
4338 | #endif |
4339 | ||
546ff777 AM |
4340 | i = lower_bound; |
4341 | /* Don't worry about things in the fixed argument area; | |
4342 | it has already been saved. */ | |
4343 | if (i < reg_parm_stack_space) | |
4344 | i = reg_parm_stack_space; | |
4345 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4346 | i++; | |
51bbfa0c | 4347 | |
546ff777 | 4348 | if (i < upper_bound) |
51bbfa0c | 4349 | { |
e7949876 AM |
4350 | /* We need to make a save area. */ |
4351 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4352 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4353 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4354 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
f73ad30e JH |
4355 | |
4356 | if (save_mode == BLKmode) | |
4357 | { | |
1da68f56 RK |
4358 | tree ot = TREE_TYPE (arg->tree_value); |
4359 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4360 | | TYPE_QUAL_CONST)); | |
4361 | ||
4362 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
f73ad30e JH |
4363 | preserve_temp_slots (arg->save_area); |
4364 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
44bb111a RH |
4365 | expr_size (arg->tree_value), |
4366 | BLOCK_OP_CALL_PARM); | |
f73ad30e JH |
4367 | } |
4368 | else | |
4369 | { | |
4370 | arg->save_area = gen_reg_rtx (save_mode); | |
4371 | emit_move_insn (arg->save_area, stack_area); | |
4372 | } | |
51bbfa0c RS |
4373 | } |
4374 | } | |
4375 | } | |
b564df06 | 4376 | |
51bbfa0c RS |
4377 | /* If this isn't going to be placed on both the stack and in registers, |
4378 | set up the register and number of words. */ | |
4379 | if (! arg->pass_on_stack) | |
aa7634dd DM |
4380 | { |
4381 | if (flags & ECF_SIBCALL) | |
4382 | reg = arg->tail_call_reg; | |
4383 | else | |
4384 | reg = arg->reg; | |
4385 | partial = arg->partial; | |
4386 | } | |
51bbfa0c RS |
4387 | |
4388 | if (reg != 0 && partial == 0) | |
4389 | /* Being passed entirely in a register. We shouldn't be called in | |
6d2f8887 | 4390 | this case. */ |
51bbfa0c RS |
4391 | abort (); |
4392 | ||
4ab56118 RK |
4393 | /* If this arg needs special alignment, don't load the registers |
4394 | here. */ | |
4395 | if (arg->n_aligned_regs != 0) | |
4396 | reg = 0; | |
f725a3ec | 4397 | |
4ab56118 | 4398 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4399 | it directly into its stack slot. Otherwise, we can. */ |
4400 | if (arg->value == 0) | |
d64f5a78 | 4401 | { |
d64f5a78 RS |
4402 | /* stack_arg_under_construction is nonzero if a function argument is |
4403 | being evaluated directly into the outgoing argument list and | |
4404 | expand_call must take special action to preserve the argument list | |
4405 | if it is called recursively. | |
4406 | ||
4407 | For scalar function arguments stack_usage_map is sufficient to | |
4408 | determine which stack slots must be saved and restored. Scalar | |
4409 | arguments in general have pass_on_stack == 0. | |
4410 | ||
4411 | If this argument is initialized by a function which takes the | |
4412 | address of the argument (a C++ constructor or a C function | |
4413 | returning a BLKmode structure), then stack_usage_map is | |
4414 | insufficient and expand_call must push the stack around the | |
4415 | function call. Such arguments have pass_on_stack == 1. | |
4416 | ||
4417 | Note that it is always safe to set stack_arg_under_construction, | |
4418 | but this generates suboptimal code if set when not needed. */ | |
4419 | ||
4420 | if (arg->pass_on_stack) | |
4421 | stack_arg_under_construction++; | |
f73ad30e | 4422 | |
3a08477a RK |
4423 | arg->value = expand_expr (pval, |
4424 | (partial | |
4425 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4426 | ? NULL_RTX : arg->stack, | |
8403445a | 4427 | VOIDmode, EXPAND_STACK_PARM); |
1efe6448 RK |
4428 | |
4429 | /* If we are promoting object (or for any other reason) the mode | |
4430 | doesn't agree, convert the mode. */ | |
4431 | ||
7373d92d RK |
4432 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4433 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4434 | arg->value, arg->unsignedp); | |
1efe6448 | 4435 | |
d64f5a78 RS |
4436 | if (arg->pass_on_stack) |
4437 | stack_arg_under_construction--; | |
d64f5a78 | 4438 | } |
51bbfa0c RS |
4439 | |
4440 | /* Don't allow anything left on stack from computation | |
4441 | of argument to alloca. */ | |
f8a097cd | 4442 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4443 | do_pending_stack_adjust (); |
4444 | ||
4445 | if (arg->value == arg->stack) | |
37a08a29 RK |
4446 | /* If the value is already in the stack slot, we are done. */ |
4447 | ; | |
1efe6448 | 4448 | else if (arg->mode != BLKmode) |
51bbfa0c | 4449 | { |
b3694847 | 4450 | int size; |
51bbfa0c RS |
4451 | |
4452 | /* Argument is a scalar, not entirely passed in registers. | |
4453 | (If part is passed in registers, arg->partial says how much | |
4454 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4455 | |
51bbfa0c RS |
4456 | Push it, and if its size is less than the |
4457 | amount of space allocated to it, | |
4458 | also bump stack pointer by the additional space. | |
4459 | Note that in C the default argument promotions | |
4460 | will prevent such mismatches. */ | |
4461 | ||
1efe6448 | 4462 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4463 | /* Compute how much space the push instruction will push. |
4464 | On many machines, pushing a byte will advance the stack | |
4465 | pointer by a halfword. */ | |
4466 | #ifdef PUSH_ROUNDING | |
4467 | size = PUSH_ROUNDING (size); | |
4468 | #endif | |
4469 | used = size; | |
4470 | ||
4471 | /* Compute how much space the argument should get: | |
4472 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4473 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4474 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4475 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4476 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4477 | ||
4478 | /* This isn't already where we want it on the stack, so put it there. | |
4479 | This can either be done with push or copy insns. */ | |
d329e058 | 4480 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
44bb111a | 4481 | PARM_BOUNDARY, partial, reg, used - size, argblock, |
e7949876 AM |
4482 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4483 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
841404cd AO |
4484 | |
4485 | /* Unless this is a partially-in-register argument, the argument is now | |
4486 | in the stack. */ | |
4487 | if (partial == 0) | |
4488 | arg->value = arg->stack; | |
51bbfa0c RS |
4489 | } |
4490 | else | |
4491 | { | |
4492 | /* BLKmode, at least partly to be pushed. */ | |
4493 | ||
1b1f20ca | 4494 | unsigned int parm_align; |
b3694847 | 4495 | int excess; |
51bbfa0c RS |
4496 | rtx size_rtx; |
4497 | ||
4498 | /* Pushing a nonscalar. | |
4499 | If part is passed in registers, PARTIAL says how much | |
4500 | and emit_push_insn will take care of putting it there. */ | |
4501 | ||
4502 | /* Round its size up to a multiple | |
4503 | of the allocation unit for arguments. */ | |
4504 | ||
e7949876 | 4505 | if (arg->locate.size.var != 0) |
51bbfa0c RS |
4506 | { |
4507 | excess = 0; | |
e7949876 | 4508 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
51bbfa0c RS |
4509 | } |
4510 | else | |
4511 | { | |
51bbfa0c RS |
4512 | /* PUSH_ROUNDING has no effect on us, because |
4513 | emit_push_insn for BLKmode is careful to avoid it. */ | |
e7949876 AM |
4514 | excess = (arg->locate.size.constant |
4515 | - int_size_in_bytes (TREE_TYPE (pval)) | |
51bbfa0c | 4516 | + partial * UNITS_PER_WORD); |
db4c55f6 JM |
4517 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
4518 | NULL_RTX, TYPE_MODE (sizetype), 0); | |
51bbfa0c RS |
4519 | } |
4520 | ||
1b1f20ca RH |
4521 | /* Some types will require stricter alignment, which will be |
4522 | provided for elsewhere in argument layout. */ | |
4523 | parm_align = MAX (PARM_BOUNDARY, TYPE_ALIGN (TREE_TYPE (pval))); | |
4524 | ||
4525 | /* When an argument is padded down, the block is aligned to | |
4526 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4527 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4528 | { | |
e7949876 | 4529 | if (arg->locate.size.var) |
1b1f20ca RH |
4530 | parm_align = BITS_PER_UNIT; |
4531 | else if (excess) | |
4532 | { | |
97d05bfd | 4533 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
1b1f20ca RH |
4534 | parm_align = MIN (parm_align, excess_align); |
4535 | } | |
4536 | } | |
4537 | ||
4c6b3b2a JJ |
4538 | if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM) |
4539 | { | |
4540 | /* emit_push_insn might not work properly if arg->value and | |
e7949876 | 4541 | argblock + arg->locate.offset areas overlap. */ |
4c6b3b2a JJ |
4542 | rtx x = arg->value; |
4543 | int i = 0; | |
4544 | ||
4545 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4546 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4547 | && XEXP (XEXP (x, 0), 0) == | |
4548 | current_function_internal_arg_pointer | |
4549 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4550 | { | |
4551 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4552 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4553 | ||
4554 | /* expand_call should ensure this */ | |
e7949876 | 4555 | if (arg->locate.offset.var || GET_CODE (size_rtx) != CONST_INT) |
4c6b3b2a JJ |
4556 | abort (); |
4557 | ||
e7949876 | 4558 | if (arg->locate.offset.constant > i) |
4c6b3b2a | 4559 | { |
e7949876 | 4560 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4561 | sibcall_failure = 1; |
4562 | } | |
e7949876 | 4563 | else if (arg->locate.offset.constant < i) |
4c6b3b2a | 4564 | { |
e7949876 | 4565 | if (i < arg->locate.offset.constant + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4566 | sibcall_failure = 1; |
4567 | } | |
4568 | } | |
4569 | } | |
4570 | ||
1efe6448 | 4571 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
1b1f20ca | 4572 | parm_align, partial, reg, excess, argblock, |
e7949876 AM |
4573 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4574 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
51bbfa0c | 4575 | |
841404cd AO |
4576 | /* Unless this is a partially-in-register argument, the argument is now |
4577 | in the stack. | |
51bbfa0c | 4578 | |
841404cd AO |
4579 | ??? Unlike the case above, in which we want the actual |
4580 | address of the data, so that we can load it directly into a | |
4581 | register, here we want the address of the stack slot, so that | |
4582 | it's properly aligned for word-by-word copying or something | |
4583 | like that. It's not clear that this is always correct. */ | |
4584 | if (partial == 0) | |
4585 | arg->value = arg->stack_slot; | |
4586 | } | |
51bbfa0c | 4587 | |
8403445a AM |
4588 | /* Mark all slots this store used. */ |
4589 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4590 | && argblock && ! variable_size && arg->stack) | |
4591 | for (i = lower_bound; i < upper_bound; i++) | |
4592 | stack_usage_map[i] = 1; | |
4593 | ||
51bbfa0c RS |
4594 | /* Once we have pushed something, pops can't safely |
4595 | be deferred during the rest of the arguments. */ | |
4596 | NO_DEFER_POP; | |
4597 | ||
4598 | /* ANSI doesn't require a sequence point here, | |
4599 | but PCC has one, so this will avoid some problems. */ | |
4600 | emit_queue (); | |
4601 | ||
db907e7b RK |
4602 | /* Free any temporary slots made in processing this argument. Show |
4603 | that we might have taken the address of something and pushed that | |
4604 | as an operand. */ | |
4605 | preserve_temp_slots (NULL_RTX); | |
51bbfa0c | 4606 | free_temp_slots (); |
cc79451b | 4607 | pop_temp_slots (); |
4c6b3b2a JJ |
4608 | |
4609 | return sibcall_failure; | |
51bbfa0c | 4610 | } |
a4b1b92a | 4611 | |
a4b1b92a RH |
4612 | /* Nonzero if we do not know how to pass TYPE solely in registers. |
4613 | We cannot do so in the following cases: | |
4614 | ||
4615 | - if the type has variable size | |
4616 | - if the type is marked as addressable (it is required to be constructed | |
4617 | into the stack) | |
4618 | - if the padding and mode of the type is such that a copy into a register | |
4619 | would put it into the wrong part of the register. | |
4620 | ||
4621 | Which padding can't be supported depends on the byte endianness. | |
4622 | ||
4623 | A value in a register is implicitly padded at the most significant end. | |
4624 | On a big-endian machine, that is the lower end in memory. | |
4625 | So a value padded in memory at the upper end can't go in a register. | |
4626 | For a little-endian machine, the reverse is true. */ | |
4627 | ||
4628 | bool | |
d329e058 | 4629 | default_must_pass_in_stack (enum machine_mode mode, tree type) |
a4b1b92a RH |
4630 | { |
4631 | if (!type) | |
40cdfd5a | 4632 | return false; |
a4b1b92a RH |
4633 | |
4634 | /* If the type has variable size... */ | |
4635 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4636 | return true; | |
4637 | ||
4638 | /* If the type is marked as addressable (it is required | |
4639 | to be constructed into the stack)... */ | |
4640 | if (TREE_ADDRESSABLE (type)) | |
4641 | return true; | |
4642 | ||
4643 | /* If the padding and mode of the type is such that a copy into | |
4644 | a register would put it into the wrong part of the register. */ | |
4645 | if (mode == BLKmode | |
4646 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4647 | && (FUNCTION_ARG_PADDING (mode, type) | |
4648 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4649 | return true; | |
4650 | ||
4651 | return false; | |
4652 | } |