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66d433c7 | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
45550790 | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
a8349c62 | 3 | 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
66d433c7 | 4 | |
f12b58b3 | 5 | This file is part of GCC. |
66d433c7 | 6 | |
f12b58b3 | 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. | |
66d433c7 | 11 | |
f12b58b3 | 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. | |
66d433c7 | 16 | |
17 | You should have received a copy of the GNU General Public License | |
f12b58b3 | 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. */ | |
66d433c7 | 21 | |
22 | #include "config.h" | |
405711de | 23 | #include "system.h" |
805e22b2 | 24 | #include "coretypes.h" |
25 | #include "tm.h" | |
405711de | 26 | #include "rtl.h" |
27 | #include "tree.h" | |
28 | #include "flags.h" | |
29 | #include "expr.h" | |
5f4cd670 | 30 | #include "optabs.h" |
d8fc4d0b | 31 | #include "libfuncs.h" |
0a893c29 | 32 | #include "function.h" |
405711de | 33 | #include "regs.h" |
9cdfa0b0 | 34 | #include "toplev.h" |
cd03a192 | 35 | #include "output.h" |
075136a2 | 36 | #include "tm_p.h" |
a6260fc7 | 37 | #include "timevar.h" |
7ecc63d3 | 38 | #include "sbitmap.h" |
771d21fa | 39 | #include "langhooks.h" |
6fce022c | 40 | #include "target.h" |
28992b23 | 41 | #include "cgraph.h" |
95cedffb | 42 | #include "except.h" |
66d433c7 | 43 | |
dfb1ee39 | 44 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
45 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
66d433c7 | 46 | |
47 | /* Data structure and subroutines used within expand_call. */ | |
48 | ||
49 | struct arg_data | |
50 | { | |
51 | /* Tree node for this argument. */ | |
52 | tree tree_value; | |
1c0c37a5 | 53 | /* Mode for value; TYPE_MODE unless promoted. */ |
54 | enum machine_mode mode; | |
66d433c7 | 55 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
56 | rtx value; | |
57 | /* Initially-compute RTL value for argument; only for const functions. */ | |
58 | rtx initial_value; | |
59 | /* Register to pass this argument in, 0 if passed on stack, or an | |
566d850a | 60 | PARALLEL if the arg is to be copied into multiple non-contiguous |
66d433c7 | 61 | registers. */ |
62 | rtx reg; | |
0e0be288 | 63 | /* Register to pass this argument in when generating tail call sequence. |
64 | This is not the same register as for normal calls on machines with | |
65 | register windows. */ | |
66 | rtx tail_call_reg; | |
23eb5fa6 | 67 | /* If REG was promoted from the actual mode of the argument expression, |
68 | indicates whether the promotion is sign- or zero-extended. */ | |
69 | int unsignedp; | |
66d433c7 | 70 | /* Number of registers to use. 0 means put the whole arg in registers. |
71 | Also 0 if not passed in registers. */ | |
72 | int partial; | |
d10cfa8d | 73 | /* Nonzero if argument must be passed on stack. |
f848041f | 74 | Note that some arguments may be passed on the stack |
75 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
76 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
66d433c7 | 77 | int pass_on_stack; |
241399f6 | 78 | /* Some fields packaged up for locate_and_pad_parm. */ |
79 | struct locate_and_pad_arg_data locate; | |
66d433c7 | 80 | /* Location on the stack at which parameter should be stored. The store |
81 | has already been done if STACK == VALUE. */ | |
82 | rtx stack; | |
83 | /* Location on the stack of the start of this argument slot. This can | |
84 | differ from STACK if this arg pads downward. This location is known | |
85 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
86 | rtx stack_slot; | |
66d433c7 | 87 | /* Place that this stack area has been saved, if needed. */ |
88 | rtx save_area; | |
f28c7a75 | 89 | /* If an argument's alignment does not permit direct copying into registers, |
90 | copy in smaller-sized pieces into pseudos. These are stored in a | |
91 | block pointed to by this field. The next field says how many | |
92 | word-sized pseudos we made. */ | |
93 | rtx *aligned_regs; | |
94 | int n_aligned_regs; | |
66d433c7 | 95 | }; |
96 | ||
d10cfa8d | 97 | /* A vector of one char per byte of stack space. A byte if nonzero if |
66d433c7 | 98 | the corresponding stack location has been used. |
99 | This vector is used to prevent a function call within an argument from | |
100 | clobbering any stack already set up. */ | |
101 | static char *stack_usage_map; | |
102 | ||
103 | /* Size of STACK_USAGE_MAP. */ | |
104 | static int highest_outgoing_arg_in_use; | |
d1b03b62 | 105 | |
7ecc63d3 | 106 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
107 | stack location's tail call argument has been already stored into the stack. | |
108 | This bitmap is used to prevent sibling call optimization if function tries | |
109 | to use parent's incoming argument slots when they have been already | |
110 | overwritten with tail call arguments. */ | |
111 | static sbitmap stored_args_map; | |
112 | ||
d1b03b62 | 113 | /* stack_arg_under_construction is nonzero when an argument may be |
114 | initialized with a constructor call (including a C function that | |
115 | returns a BLKmode struct) and expand_call must take special action | |
116 | to make sure the object being constructed does not overlap the | |
117 | argument list for the constructor call. */ | |
118 | int stack_arg_under_construction; | |
66d433c7 | 119 | |
4ee9c684 | 120 | static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, |
4c9e08a4 | 121 | HOST_WIDE_INT, rtx, rtx, int, rtx, int, |
122 | CUMULATIVE_ARGS *); | |
123 | static void precompute_register_parameters (int, struct arg_data *, int *); | |
124 | static int store_one_arg (struct arg_data *, rtx, int, int, int); | |
125 | static void store_unaligned_arguments_into_pseudos (struct arg_data *, int); | |
126 | static int finalize_must_preallocate (int, int, struct arg_data *, | |
127 | struct args_size *); | |
128 | static void precompute_arguments (int, int, struct arg_data *); | |
129 | static int compute_argument_block_size (int, struct args_size *, int); | |
130 | static void initialize_argument_information (int, struct arg_data *, | |
131 | struct args_size *, int, tree, | |
132 | tree, CUMULATIVE_ARGS *, int, | |
eaa112a0 | 133 | rtx *, int *, int *, int *, |
4ee9c684 | 134 | bool *, bool); |
4c9e08a4 | 135 | static void compute_argument_addresses (struct arg_data *, rtx, int); |
136 | static rtx rtx_for_function_call (tree, tree); | |
137 | static void load_register_parameters (struct arg_data *, int, rtx *, int, | |
138 | int, int *); | |
139 | static rtx emit_library_call_value_1 (int, rtx, rtx, enum libcall_type, | |
140 | enum machine_mode, int, va_list); | |
141 | static int special_function_p (tree, int); | |
4c9e08a4 | 142 | static int check_sibcall_argument_overlap_1 (rtx); |
143 | static int check_sibcall_argument_overlap (rtx, struct arg_data *, int); | |
144 | ||
145 | static int combine_pending_stack_adjustment_and_call (int, struct args_size *, | |
146 | int); | |
147 | static tree fix_unsafe_tree (tree); | |
2c8ff1ed | 148 | static bool shift_returned_value (tree, rtx *); |
cde25025 | 149 | |
4448f543 | 150 | #ifdef REG_PARM_STACK_SPACE |
4c9e08a4 | 151 | static rtx save_fixed_argument_area (int, rtx, int *, int *); |
152 | static void restore_fixed_argument_area (rtx, rtx, int, int); | |
6a0e6138 | 153 | #endif |
66d433c7 | 154 | \f |
66d433c7 | 155 | /* Force FUNEXP into a form suitable for the address of a CALL, |
156 | and return that as an rtx. Also load the static chain register | |
157 | if FNDECL is a nested function. | |
158 | ||
8866f42d | 159 | CALL_FUSAGE points to a variable holding the prospective |
160 | CALL_INSN_FUNCTION_USAGE information. */ | |
66d433c7 | 161 | |
d9076622 | 162 | rtx |
4ee9c684 | 163 | prepare_call_address (rtx funexp, rtx static_chain_value, |
164 | rtx *call_fusage, int reg_parm_seen, int sibcallp) | |
66d433c7 | 165 | { |
66d433c7 | 166 | funexp = protect_from_queue (funexp, 0); |
167 | ||
c7bf1374 | 168 | /* Make a valid memory address and copy constants through pseudo-regs, |
66d433c7 | 169 | but not for a constant address if -fno-function-cse. */ |
170 | if (GET_CODE (funexp) != SYMBOL_REF) | |
a89aeae3 | 171 | /* If we are using registers for parameters, force the |
0dbd1c74 | 172 | function address into a register now. */ |
173 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
174 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
175 | : memory_address (FUNCTION_MODE, funexp)); | |
707ff8b1 | 176 | else if (! sibcallp) |
66d433c7 | 177 | { |
178 | #ifndef NO_FUNCTION_CSE | |
179 | if (optimize && ! flag_no_function_cse) | |
fb154d03 | 180 | funexp = force_reg (Pmode, funexp); |
66d433c7 | 181 | #endif |
182 | } | |
183 | ||
184 | if (static_chain_value != 0) | |
185 | { | |
186 | emit_move_insn (static_chain_rtx, static_chain_value); | |
187 | ||
8ad4c111 | 188 | if (REG_P (static_chain_rtx)) |
4eb91f6f | 189 | use_reg (call_fusage, static_chain_rtx); |
66d433c7 | 190 | } |
191 | ||
192 | return funexp; | |
193 | } | |
194 | ||
195 | /* Generate instructions to call function FUNEXP, | |
196 | and optionally pop the results. | |
197 | The CALL_INSN is the first insn generated. | |
198 | ||
c74d0a20 | 199 | FNDECL is the declaration node of the function. This is given to the |
e93a4612 | 200 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
201 | ||
d429bc10 | 202 | FUNTYPE is the data type of the function. This is given to the macro |
203 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
204 | We used to allow an identifier for library functions, but that doesn't | |
205 | work when the return type is an aggregate type and the calling convention | |
206 | says that the pointer to this aggregate is to be popped by the callee. | |
66d433c7 | 207 | |
208 | STACK_SIZE is the number of bytes of arguments on the stack, | |
a62b99b7 | 209 | ROUNDED_STACK_SIZE is that number rounded up to |
210 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
211 | both to put into the call insn and to generate explicit popping | |
212 | code if necessary. | |
66d433c7 | 213 | |
214 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
215 | It is zero if this call doesn't want a structure value. | |
216 | ||
217 | NEXT_ARG_REG is the rtx that results from executing | |
218 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
219 | just after all the args have had their registers assigned. | |
220 | This could be whatever you like, but normally it is the first | |
221 | arg-register beyond those used for args in this call, | |
222 | or 0 if all the arg-registers are used in this call. | |
223 | It is passed on to `gen_call' so you can put this info in the call insn. | |
224 | ||
225 | VALREG is a hard register in which a value is returned, | |
226 | or 0 if the call does not return a value. | |
227 | ||
228 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
229 | the args to this call were processed. | |
230 | We restore `inhibit_defer_pop' to that value. | |
231 | ||
07409b3a | 232 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
1e625a2e | 233 | denote registers used by the called function. */ |
c87678e4 | 234 | |
8ddf1c7e | 235 | static void |
4ee9c684 | 236 | emit_call_1 (rtx funexp, tree fntree, tree fndecl ATTRIBUTE_UNUSED, |
237 | tree funtype ATTRIBUTE_UNUSED, | |
4c9e08a4 | 238 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED, |
239 | HOST_WIDE_INT rounded_stack_size, | |
240 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED, | |
241 | rtx next_arg_reg ATTRIBUTE_UNUSED, rtx valreg, | |
242 | int old_inhibit_defer_pop, rtx call_fusage, int ecf_flags, | |
243 | CUMULATIVE_ARGS *args_so_far ATTRIBUTE_UNUSED) | |
66d433c7 | 244 | { |
dd837bff | 245 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
66d433c7 | 246 | rtx call_insn; |
247 | int already_popped = 0; | |
e39fae61 | 248 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
2ed6c343 | 249 | #if defined (HAVE_call) && defined (HAVE_call_value) |
250 | rtx struct_value_size_rtx; | |
251 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
252 | #endif | |
66d433c7 | 253 | |
87e19636 | 254 | #ifdef CALL_POPS_ARGS |
255 | n_popped += CALL_POPS_ARGS (* args_so_far); | |
256 | #endif | |
4c9e08a4 | 257 | |
66d433c7 | 258 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
259 | and we don't want to load it into a register as an optimization, | |
260 | because prepare_call_address already did it if it should be done. */ | |
261 | if (GET_CODE (funexp) != SYMBOL_REF) | |
262 | funexp = memory_address (FUNCTION_MODE, funexp); | |
263 | ||
60ecc450 | 264 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
265 | if ((ecf_flags & ECF_SIBCALL) | |
266 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
a864723e | 267 | && (n_popped > 0 || stack_size == 0)) |
60ecc450 | 268 | { |
2a631e19 | 269 | rtx n_pop = GEN_INT (n_popped); |
60ecc450 | 270 | rtx pat; |
271 | ||
272 | /* If this subroutine pops its own args, record that in the call insn | |
273 | if possible, for the sake of frame pointer elimination. */ | |
274 | ||
275 | if (valreg) | |
2ed6c343 | 276 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
60ecc450 | 277 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
278 | rounded_stack_size_rtx, next_arg_reg, | |
279 | n_pop); | |
280 | else | |
2ed6c343 | 281 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
60ecc450 | 282 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
283 | ||
284 | emit_call_insn (pat); | |
285 | already_popped = 1; | |
286 | } | |
287 | else | |
288 | #endif | |
289 | ||
66d433c7 | 290 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
2a631e19 | 291 | /* If the target has "call" or "call_value" insns, then prefer them |
292 | if no arguments are actually popped. If the target does not have | |
293 | "call" or "call_value" insns, then we must use the popping versions | |
294 | even if the call has no arguments to pop. */ | |
ec596f3b | 295 | #if defined (HAVE_call) && defined (HAVE_call_value) |
296 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
d490e2f2 | 297 | && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
ec596f3b | 298 | #else |
299 | if (HAVE_call_pop && HAVE_call_value_pop) | |
300 | #endif | |
66d433c7 | 301 | { |
e39fae61 | 302 | rtx n_pop = GEN_INT (n_popped); |
66d433c7 | 303 | rtx pat; |
304 | ||
305 | /* If this subroutine pops its own args, record that in the call insn | |
306 | if possible, for the sake of frame pointer elimination. */ | |
e93a4612 | 307 | |
66d433c7 | 308 | if (valreg) |
2ed6c343 | 309 | pat = GEN_CALL_VALUE_POP (valreg, |
941522d6 | 310 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 311 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
66d433c7 | 312 | else |
2ed6c343 | 313 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 314 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
66d433c7 | 315 | |
316 | emit_call_insn (pat); | |
317 | already_popped = 1; | |
318 | } | |
319 | else | |
320 | #endif | |
66d433c7 | 321 | |
60ecc450 | 322 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
323 | if ((ecf_flags & ECF_SIBCALL) | |
324 | && HAVE_sibcall && HAVE_sibcall_value) | |
325 | { | |
326 | if (valreg) | |
2ed6c343 | 327 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
60ecc450 | 328 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
329 | rounded_stack_size_rtx, | |
330 | next_arg_reg, NULL_RTX)); | |
331 | else | |
2ed6c343 | 332 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
60ecc450 | 333 | rounded_stack_size_rtx, next_arg_reg, |
334 | struct_value_size_rtx)); | |
335 | } | |
336 | else | |
337 | #endif | |
338 | ||
66d433c7 | 339 | #if defined (HAVE_call) && defined (HAVE_call_value) |
340 | if (HAVE_call && HAVE_call_value) | |
341 | { | |
342 | if (valreg) | |
2ed6c343 | 343 | emit_call_insn (GEN_CALL_VALUE (valreg, |
941522d6 | 344 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 345 | rounded_stack_size_rtx, next_arg_reg, |
1e8cd5a7 | 346 | NULL_RTX)); |
66d433c7 | 347 | else |
2ed6c343 | 348 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 349 | rounded_stack_size_rtx, next_arg_reg, |
66d433c7 | 350 | struct_value_size_rtx)); |
351 | } | |
352 | else | |
353 | #endif | |
354 | abort (); | |
355 | ||
d5f9786f | 356 | /* Find the call we just emitted. */ |
357 | call_insn = last_call_insn (); | |
66d433c7 | 358 | |
26dfc457 | 359 | /* Mark memory as used for "pure" function call. */ |
360 | if (ecf_flags & ECF_PURE) | |
2a631e19 | 361 | call_fusage |
362 | = gen_rtx_EXPR_LIST | |
363 | (VOIDmode, | |
364 | gen_rtx_USE (VOIDmode, | |
365 | gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))), | |
366 | call_fusage); | |
26dfc457 | 367 | |
d5f9786f | 368 | /* Put the register usage information there. */ |
369 | add_function_usage_to (call_insn, call_fusage); | |
66d433c7 | 370 | |
371 | /* If this is a const call, then set the insn's unchanging bit. */ | |
26dfc457 | 372 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
06a652d1 | 373 | CONST_OR_PURE_CALL_P (call_insn) = 1; |
66d433c7 | 374 | |
00dd2e9e | 375 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
376 | effect. */ | |
60ecc450 | 377 | if (ecf_flags & ECF_NOTHROW) |
4e834ca8 | 378 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
00dd2e9e | 379 | REG_NOTES (call_insn)); |
95cedffb | 380 | else |
4ee9c684 | 381 | { |
382 | int rn = lookup_stmt_eh_region (fntree); | |
383 | ||
384 | /* If rn < 0, then either (1) tree-ssa not used or (2) doesn't | |
385 | throw, which we already took care of. */ | |
386 | if (rn > 0) | |
387 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, GEN_INT (rn), | |
388 | REG_NOTES (call_insn)); | |
389 | note_current_region_may_contain_throw (); | |
390 | } | |
00dd2e9e | 391 | |
356b51a0 | 392 | if (ecf_flags & ECF_NORETURN) |
393 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx, | |
394 | REG_NOTES (call_insn)); | |
6d8a270d | 395 | if (ecf_flags & ECF_ALWAYS_RETURN) |
396 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_ALWAYS_RETURN, const0_rtx, | |
397 | REG_NOTES (call_insn)); | |
356b51a0 | 398 | |
9239aee6 | 399 | if (ecf_flags & ECF_RETURNS_TWICE) |
0ff18307 | 400 | { |
401 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_SETJMP, const0_rtx, | |
402 | REG_NOTES (call_insn)); | |
403 | current_function_calls_setjmp = 1; | |
404 | } | |
9239aee6 | 405 | |
60ecc450 | 406 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
407 | ||
d1f88d00 | 408 | /* Restore this now, so that we do defer pops for this call's args |
409 | if the context of the call as a whole permits. */ | |
410 | inhibit_defer_pop = old_inhibit_defer_pop; | |
411 | ||
e39fae61 | 412 | if (n_popped > 0) |
66d433c7 | 413 | { |
414 | if (!already_popped) | |
37808e3a | 415 | CALL_INSN_FUNCTION_USAGE (call_insn) |
941522d6 | 416 | = gen_rtx_EXPR_LIST (VOIDmode, |
417 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
418 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
e39fae61 | 419 | rounded_stack_size -= n_popped; |
dd837bff | 420 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
91b70175 | 421 | stack_pointer_delta -= n_popped; |
66d433c7 | 422 | } |
423 | ||
4448f543 | 424 | if (!ACCUMULATE_OUTGOING_ARGS) |
66d433c7 | 425 | { |
4448f543 | 426 | /* If returning from the subroutine does not automatically pop the args, |
427 | we need an instruction to pop them sooner or later. | |
428 | Perhaps do it now; perhaps just record how much space to pop later. | |
429 | ||
430 | If returning from the subroutine does pop the args, indicate that the | |
431 | stack pointer will be changed. */ | |
432 | ||
10d1a2c0 | 433 | if (rounded_stack_size != 0) |
4448f543 | 434 | { |
b494d193 | 435 | if (ecf_flags & (ECF_SP_DEPRESSED | ECF_NORETURN | ECF_LONGJMP)) |
10d1a2c0 | 436 | /* Just pretend we did the pop. */ |
437 | stack_pointer_delta -= rounded_stack_size; | |
438 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
d490e2f2 | 439 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
4448f543 | 440 | pending_stack_adjust += rounded_stack_size; |
441 | else | |
442 | adjust_stack (rounded_stack_size_rtx); | |
443 | } | |
66d433c7 | 444 | } |
4448f543 | 445 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
446 | Restore the stack pointer to its original value now. Usually | |
447 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
448 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
449 | popping variants of functions exist as well. | |
450 | ||
451 | ??? We may optimize similar to defer_pop above, but it is | |
452 | probably not worthwhile. | |
c87678e4 | 453 | |
4448f543 | 454 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
455 | such machines. */ | |
456 | else if (n_popped) | |
457 | anti_adjust_stack (GEN_INT (n_popped)); | |
66d433c7 | 458 | } |
459 | ||
6a0e6138 | 460 | /* Determine if the function identified by NAME and FNDECL is one with |
461 | special properties we wish to know about. | |
462 | ||
463 | For example, if the function might return more than one time (setjmp), then | |
464 | set RETURNS_TWICE to a nonzero value. | |
465 | ||
dfe08167 | 466 | Similarly set LONGJMP for if the function is in the longjmp family. |
6a0e6138 | 467 | |
6a0e6138 | 468 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
469 | space from the stack such as alloca. */ | |
470 | ||
dfe08167 | 471 | static int |
4c9e08a4 | 472 | special_function_p (tree fndecl, int flags) |
6a0e6138 | 473 | { |
4ee9c684 | 474 | if (fndecl && DECL_NAME (fndecl) |
7259f3f8 | 475 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
6a0e6138 | 476 | /* Exclude functions not at the file scope, or not `extern', |
477 | since they are not the magic functions we would otherwise | |
40109983 | 478 | think they are. |
479 | FIXME: this should be handled with attributes, not with this | |
480 | hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
481 | because you can declare fork() inside a function if you | |
482 | wish. */ | |
483 | && (DECL_CONTEXT (fndecl) == NULL_TREE | |
484 | || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) | |
485 | && TREE_PUBLIC (fndecl)) | |
6a0e6138 | 486 | { |
71d9fc9b | 487 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
488 | const char *tname = name; | |
6a0e6138 | 489 | |
cc7cc47f | 490 | /* We assume that alloca will always be called by name. It |
491 | makes no sense to pass it as a pointer-to-function to | |
492 | anything that does not understand its behavior. */ | |
dfe08167 | 493 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
494 | && name[0] == 'a' | |
495 | && ! strcmp (name, "alloca")) | |
496 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
497 | && name[0] == '_' | |
498 | && ! strcmp (name, "__builtin_alloca")))) | |
499 | flags |= ECF_MAY_BE_ALLOCA; | |
cc7cc47f | 500 | |
6a0e6138 | 501 | /* Disregard prefix _, __ or __x. */ |
502 | if (name[0] == '_') | |
503 | { | |
504 | if (name[1] == '_' && name[2] == 'x') | |
505 | tname += 3; | |
506 | else if (name[1] == '_') | |
507 | tname += 2; | |
508 | else | |
509 | tname += 1; | |
510 | } | |
511 | ||
512 | if (tname[0] == 's') | |
513 | { | |
dfe08167 | 514 | if ((tname[1] == 'e' |
515 | && (! strcmp (tname, "setjmp") | |
516 | || ! strcmp (tname, "setjmp_syscall"))) | |
517 | || (tname[1] == 'i' | |
518 | && ! strcmp (tname, "sigsetjmp")) | |
519 | || (tname[1] == 'a' | |
520 | && ! strcmp (tname, "savectx"))) | |
521 | flags |= ECF_RETURNS_TWICE; | |
522 | ||
6a0e6138 | 523 | if (tname[1] == 'i' |
524 | && ! strcmp (tname, "siglongjmp")) | |
dfe08167 | 525 | flags |= ECF_LONGJMP; |
6a0e6138 | 526 | } |
527 | else if ((tname[0] == 'q' && tname[1] == 's' | |
528 | && ! strcmp (tname, "qsetjmp")) | |
529 | || (tname[0] == 'v' && tname[1] == 'f' | |
530 | && ! strcmp (tname, "vfork"))) | |
dfe08167 | 531 | flags |= ECF_RETURNS_TWICE; |
6a0e6138 | 532 | |
533 | else if (tname[0] == 'l' && tname[1] == 'o' | |
534 | && ! strcmp (tname, "longjmp")) | |
dfe08167 | 535 | flags |= ECF_LONGJMP; |
6a0e6138 | 536 | } |
73673831 | 537 | |
dfe08167 | 538 | return flags; |
6a0e6138 | 539 | } |
540 | ||
dfe08167 | 541 | /* Return nonzero when tree represent call to longjmp. */ |
d490e2f2 | 542 | |
dfe08167 | 543 | int |
4c9e08a4 | 544 | setjmp_call_p (tree fndecl) |
dfe08167 | 545 | { |
546 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
547 | } | |
548 | ||
9a7ecb49 | 549 | /* Return true when exp contains alloca call. */ |
550 | bool | |
4c9e08a4 | 551 | alloca_call_p (tree exp) |
9a7ecb49 | 552 | { |
553 | if (TREE_CODE (exp) == CALL_EXPR | |
554 | && TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
555 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
556 | == FUNCTION_DECL) | |
557 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
558 | 0) & ECF_MAY_BE_ALLOCA)) | |
559 | return true; | |
560 | return false; | |
561 | } | |
562 | ||
5edaabad | 563 | /* Detect flags (function attributes) from the function decl or type node. */ |
d490e2f2 | 564 | |
805e22b2 | 565 | int |
4c9e08a4 | 566 | flags_from_decl_or_type (tree exp) |
dfe08167 | 567 | { |
568 | int flags = 0; | |
5edaabad | 569 | tree type = exp; |
7a24815f | 570 | |
dfe08167 | 571 | if (DECL_P (exp)) |
572 | { | |
28992b23 | 573 | struct cgraph_rtl_info *i = cgraph_rtl_info (exp); |
5edaabad | 574 | type = TREE_TYPE (exp); |
575 | ||
7a24815f | 576 | if (i) |
577 | { | |
578 | if (i->pure_function) | |
579 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; | |
580 | if (i->const_function) | |
581 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; | |
582 | } | |
28992b23 | 583 | |
dfe08167 | 584 | /* The function exp may have the `malloc' attribute. */ |
7a24815f | 585 | if (DECL_IS_MALLOC (exp)) |
dfe08167 | 586 | flags |= ECF_MALLOC; |
587 | ||
26dfc457 | 588 | /* The function exp may have the `pure' attribute. */ |
7a24815f | 589 | if (DECL_IS_PURE (exp)) |
2a0c81bf | 590 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
26dfc457 | 591 | |
dfe08167 | 592 | if (TREE_NOTHROW (exp)) |
593 | flags |= ECF_NOTHROW; | |
b15db406 | 594 | |
595 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) | |
66d12a6c | 596 | flags |= ECF_LIBCALL_BLOCK | ECF_CONST; |
4ee9c684 | 597 | |
598 | flags = special_function_p (exp, flags); | |
dfe08167 | 599 | } |
66d12a6c | 600 | else if (TYPE_P (exp) && TYPE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
b15db406 | 601 | flags |= ECF_CONST; |
dfe08167 | 602 | |
603 | if (TREE_THIS_VOLATILE (exp)) | |
604 | flags |= ECF_NORETURN; | |
605 | ||
5edaabad | 606 | /* Mark if the function returns with the stack pointer depressed. We |
607 | cannot consider it pure or constant in that case. */ | |
608 | if (TREE_CODE (type) == FUNCTION_TYPE && TYPE_RETURNS_STACK_DEPRESSED (type)) | |
609 | { | |
610 | flags |= ECF_SP_DEPRESSED; | |
2a0c81bf | 611 | flags &= ~(ECF_PURE | ECF_CONST | ECF_LIBCALL_BLOCK); |
5edaabad | 612 | } |
613 | ||
dfe08167 | 614 | return flags; |
615 | } | |
616 | ||
886a914d | 617 | /* Detect flags from a CALL_EXPR. */ |
618 | ||
619 | int | |
620 | call_expr_flags (tree t) | |
621 | { | |
622 | int flags; | |
623 | tree decl = get_callee_fndecl (t); | |
624 | ||
625 | if (decl) | |
626 | flags = flags_from_decl_or_type (decl); | |
627 | else | |
628 | { | |
629 | t = TREE_TYPE (TREE_OPERAND (t, 0)); | |
630 | if (t && TREE_CODE (t) == POINTER_TYPE) | |
631 | flags = flags_from_decl_or_type (TREE_TYPE (t)); | |
632 | else | |
633 | flags = 0; | |
634 | } | |
635 | ||
636 | return flags; | |
637 | } | |
638 | ||
6a0e6138 | 639 | /* Precompute all register parameters as described by ARGS, storing values |
640 | into fields within the ARGS array. | |
641 | ||
642 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
643 | ||
644 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
645 | ||
646 | static void | |
4c9e08a4 | 647 | precompute_register_parameters (int num_actuals, struct arg_data *args, int *reg_parm_seen) |
6a0e6138 | 648 | { |
649 | int i; | |
650 | ||
651 | *reg_parm_seen = 0; | |
652 | ||
653 | for (i = 0; i < num_actuals; i++) | |
654 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
655 | { | |
656 | *reg_parm_seen = 1; | |
657 | ||
658 | if (args[i].value == 0) | |
659 | { | |
660 | push_temp_slots (); | |
661 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, | |
662 | VOIDmode, 0); | |
663 | preserve_temp_slots (args[i].value); | |
664 | pop_temp_slots (); | |
665 | ||
666 | /* ANSI doesn't require a sequence point here, | |
667 | but PCC has one, so this will avoid some problems. */ | |
668 | emit_queue (); | |
669 | } | |
670 | ||
e80b4463 | 671 | /* If the value is a non-legitimate constant, force it into a |
672 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
673 | if (CONSTANT_P (args[i].value) | |
674 | && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
675 | args[i].value = force_reg (args[i].mode, args[i].value); | |
676 | ||
6a0e6138 | 677 | /* If we are to promote the function arg to a wider mode, |
678 | do it now. */ | |
679 | ||
680 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
681 | args[i].value | |
682 | = convert_modes (args[i].mode, | |
683 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
684 | args[i].value, args[i].unsignedp); | |
685 | ||
c87678e4 | 686 | /* If the value is expensive, and we are inside an appropriately |
6a0e6138 | 687 | short loop, put the value into a pseudo and then put the pseudo |
688 | into the hard reg. | |
689 | ||
690 | For small register classes, also do this if this call uses | |
691 | register parameters. This is to avoid reload conflicts while | |
692 | loading the parameters registers. */ | |
693 | ||
8ad4c111 | 694 | if ((! (REG_P (args[i].value) |
6a0e6138 | 695 | || (GET_CODE (args[i].value) == SUBREG |
8ad4c111 | 696 | && REG_P (SUBREG_REG (args[i].value))))) |
6a0e6138 | 697 | && args[i].mode != BLKmode |
e997907c | 698 | && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1) |
6a0e6138 | 699 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) |
700 | || preserve_subexpressions_p ())) | |
701 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
702 | } | |
703 | } | |
704 | ||
4448f543 | 705 | #ifdef REG_PARM_STACK_SPACE |
6a0e6138 | 706 | |
707 | /* The argument list is the property of the called routine and it | |
708 | may clobber it. If the fixed area has been used for previous | |
709 | parameters, we must save and restore it. */ | |
f7c44134 | 710 | |
6a0e6138 | 711 | static rtx |
4c9e08a4 | 712 | save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) |
6a0e6138 | 713 | { |
6e96b626 | 714 | int low; |
715 | int high; | |
6a0e6138 | 716 | |
6e96b626 | 717 | /* Compute the boundary of the area that needs to be saved, if any. */ |
718 | high = reg_parm_stack_space; | |
6a0e6138 | 719 | #ifdef ARGS_GROW_DOWNWARD |
6e96b626 | 720 | high += 1; |
6a0e6138 | 721 | #endif |
6e96b626 | 722 | if (high > highest_outgoing_arg_in_use) |
723 | high = highest_outgoing_arg_in_use; | |
6a0e6138 | 724 | |
6e96b626 | 725 | for (low = 0; low < high; low++) |
726 | if (stack_usage_map[low] != 0) | |
727 | { | |
728 | int num_to_save; | |
729 | enum machine_mode save_mode; | |
730 | int delta; | |
731 | rtx stack_area; | |
732 | rtx save_area; | |
6a0e6138 | 733 | |
6e96b626 | 734 | while (stack_usage_map[--high] == 0) |
735 | ; | |
6a0e6138 | 736 | |
6e96b626 | 737 | *low_to_save = low; |
738 | *high_to_save = high; | |
739 | ||
740 | num_to_save = high - low + 1; | |
741 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
6a0e6138 | 742 | |
6e96b626 | 743 | /* If we don't have the required alignment, must do this |
744 | in BLKmode. */ | |
745 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
746 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
747 | save_mode = BLKmode; | |
6a0e6138 | 748 | |
749 | #ifdef ARGS_GROW_DOWNWARD | |
6e96b626 | 750 | delta = -high; |
6a0e6138 | 751 | #else |
6e96b626 | 752 | delta = low; |
6a0e6138 | 753 | #endif |
6e96b626 | 754 | stack_area = gen_rtx_MEM (save_mode, |
755 | memory_address (save_mode, | |
756 | plus_constant (argblock, | |
757 | delta))); | |
2a631e19 | 758 | |
6e96b626 | 759 | set_mem_align (stack_area, PARM_BOUNDARY); |
760 | if (save_mode == BLKmode) | |
761 | { | |
762 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
763 | emit_block_move (validize_mem (save_area), stack_area, | |
764 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
765 | } | |
766 | else | |
767 | { | |
768 | save_area = gen_reg_rtx (save_mode); | |
769 | emit_move_insn (save_area, stack_area); | |
770 | } | |
2a631e19 | 771 | |
6e96b626 | 772 | return save_area; |
773 | } | |
774 | ||
775 | return NULL_RTX; | |
6a0e6138 | 776 | } |
777 | ||
778 | static void | |
4c9e08a4 | 779 | restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) |
6a0e6138 | 780 | { |
781 | enum machine_mode save_mode = GET_MODE (save_area); | |
6e96b626 | 782 | int delta; |
783 | rtx stack_area; | |
784 | ||
6a0e6138 | 785 | #ifdef ARGS_GROW_DOWNWARD |
6e96b626 | 786 | delta = -high_to_save; |
6a0e6138 | 787 | #else |
6e96b626 | 788 | delta = low_to_save; |
6a0e6138 | 789 | #endif |
6e96b626 | 790 | stack_area = gen_rtx_MEM (save_mode, |
791 | memory_address (save_mode, | |
792 | plus_constant (argblock, delta))); | |
793 | set_mem_align (stack_area, PARM_BOUNDARY); | |
6a0e6138 | 794 | |
795 | if (save_mode != BLKmode) | |
796 | emit_move_insn (stack_area, save_area); | |
797 | else | |
0378dbdc | 798 | emit_block_move (stack_area, validize_mem (save_area), |
799 | GEN_INT (high_to_save - low_to_save + 1), | |
800 | BLOCK_OP_CALL_PARM); | |
6a0e6138 | 801 | } |
f6025ee7 | 802 | #endif /* REG_PARM_STACK_SPACE */ |
c87678e4 | 803 | |
6a0e6138 | 804 | /* If any elements in ARGS refer to parameters that are to be passed in |
805 | registers, but not in memory, and whose alignment does not permit a | |
806 | direct copy into registers. Copy the values into a group of pseudos | |
c87678e4 | 807 | which we will later copy into the appropriate hard registers. |
6d801f27 | 808 | |
809 | Pseudos for each unaligned argument will be stored into the array | |
810 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
811 | the aligned_regs array if it is nonzero. */ | |
812 | ||
6a0e6138 | 813 | static void |
4c9e08a4 | 814 | store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) |
6a0e6138 | 815 | { |
816 | int i, j; | |
c87678e4 | 817 | |
6a0e6138 | 818 | for (i = 0; i < num_actuals; i++) |
819 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
820 | && args[i].mode == BLKmode | |
821 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
822 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
823 | { | |
824 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
5f4cd670 | 825 | int nregs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; |
826 | int endian_correction = 0; | |
6a0e6138 | 827 | |
5f4cd670 | 828 | args[i].n_aligned_regs = args[i].partial ? args[i].partial : nregs; |
f0af5a88 | 829 | args[i].aligned_regs = xmalloc (sizeof (rtx) * args[i].n_aligned_regs); |
6a0e6138 | 830 | |
5f4cd670 | 831 | /* Structures smaller than a word are normally aligned to the |
832 | least significant byte. On a BYTES_BIG_ENDIAN machine, | |
6a0e6138 | 833 | this means we must skip the empty high order bytes when |
834 | calculating the bit offset. */ | |
5f4cd670 | 835 | if (bytes < UNITS_PER_WORD |
836 | #ifdef BLOCK_REG_PADDING | |
837 | && (BLOCK_REG_PADDING (args[i].mode, | |
838 | TREE_TYPE (args[i].tree_value), 1) | |
839 | == downward) | |
840 | #else | |
841 | && BYTES_BIG_ENDIAN | |
842 | #endif | |
843 | ) | |
844 | endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
6a0e6138 | 845 | |
846 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
847 | { | |
848 | rtx reg = gen_reg_rtx (word_mode); | |
849 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
850 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
6a0e6138 | 851 | |
852 | args[i].aligned_regs[j] = reg; | |
5f4cd670 | 853 | word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
854 | word_mode, word_mode, BITS_PER_WORD); | |
6a0e6138 | 855 | |
856 | /* There is no need to restrict this code to loading items | |
857 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
858 | load up entire word sized registers efficiently. | |
859 | ||
860 | ??? This may not be needed anymore. | |
861 | We use to emit a clobber here but that doesn't let later | |
862 | passes optimize the instructions we emit. By storing 0 into | |
863 | the register later passes know the first AND to zero out the | |
864 | bitfield being set in the register is unnecessary. The store | |
865 | of 0 will be deleted as will at least the first AND. */ | |
866 | ||
867 | emit_move_insn (reg, const0_rtx); | |
868 | ||
869 | bytes -= bitsize / BITS_PER_UNIT; | |
5f4cd670 | 870 | store_bit_field (reg, bitsize, endian_correction, word_mode, |
871 | word, BITS_PER_WORD); | |
6a0e6138 | 872 | } |
873 | } | |
874 | } | |
875 | ||
cb543c54 | 876 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
c87678e4 | 877 | ACTPARMS. |
cb543c54 | 878 | |
879 | NUM_ACTUALS is the total number of parameters. | |
880 | ||
881 | N_NAMED_ARGS is the total number of named arguments. | |
882 | ||
883 | FNDECL is the tree code for the target of this call (if known) | |
884 | ||
885 | ARGS_SO_FAR holds state needed by the target to know where to place | |
886 | the next argument. | |
887 | ||
888 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
889 | for arguments which are passed in registers. | |
890 | ||
891 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
892 | and may be modified by this routine. | |
893 | ||
dfe08167 | 894 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
eaa112a0 | 895 | flags which may may be modified by this routine. |
896 | ||
4ee9c684 | 897 | MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference |
898 | that requires allocation of stack space. | |
899 | ||
eaa112a0 | 900 | CALL_FROM_THUNK_P is true if this call is the jump from a thunk to |
901 | the thunked-to function. */ | |
cb543c54 | 902 | |
903 | static void | |
4c9e08a4 | 904 | initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, |
905 | struct arg_data *args, | |
906 | struct args_size *args_size, | |
907 | int n_named_args ATTRIBUTE_UNUSED, | |
908 | tree actparms, tree fndecl, | |
909 | CUMULATIVE_ARGS *args_so_far, | |
910 | int reg_parm_stack_space, | |
911 | rtx *old_stack_level, int *old_pending_adj, | |
eaa112a0 | 912 | int *must_preallocate, int *ecf_flags, |
4ee9c684 | 913 | bool *may_tailcall, bool call_from_thunk_p) |
cb543c54 | 914 | { |
915 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
916 | int inc; | |
917 | ||
918 | /* Count arg position in order args appear. */ | |
919 | int argpos; | |
920 | ||
921 | int i; | |
922 | tree p; | |
c87678e4 | 923 | |
cb543c54 | 924 | args_size->constant = 0; |
925 | args_size->var = 0; | |
926 | ||
927 | /* In this loop, we consider args in the order they are written. | |
928 | We fill up ARGS from the front or from the back if necessary | |
929 | so that in any case the first arg to be pushed ends up at the front. */ | |
930 | ||
4448f543 | 931 | if (PUSH_ARGS_REVERSED) |
932 | { | |
933 | i = num_actuals - 1, inc = -1; | |
934 | /* In this case, must reverse order of args | |
935 | so that we compute and push the last arg first. */ | |
936 | } | |
937 | else | |
938 | { | |
939 | i = 0, inc = 1; | |
940 | } | |
cb543c54 | 941 | |
942 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
943 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
944 | { | |
945 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
946 | int unsignedp; | |
947 | enum machine_mode mode; | |
948 | ||
949 | args[i].tree_value = TREE_VALUE (p); | |
950 | ||
951 | /* Replace erroneous argument with constant zero. */ | |
4b72716d | 952 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
cb543c54 | 953 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
954 | ||
955 | /* If TYPE is a transparent union, pass things the way we would | |
956 | pass the first field of the union. We have already verified that | |
957 | the modes are the same. */ | |
851dfbff | 958 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
cb543c54 | 959 | type = TREE_TYPE (TYPE_FIELDS (type)); |
960 | ||
961 | /* Decide where to pass this arg. | |
962 | ||
963 | args[i].reg is nonzero if all or part is passed in registers. | |
964 | ||
965 | args[i].partial is nonzero if part but not all is passed in registers, | |
966 | and the exact value says how many words are passed in registers. | |
967 | ||
968 | args[i].pass_on_stack is nonzero if the argument must at least be | |
969 | computed on the stack. It may then be loaded back into registers | |
970 | if args[i].reg is nonzero. | |
971 | ||
972 | These decisions are driven by the FUNCTION_... macros and must agree | |
973 | with those made by function.c. */ | |
974 | ||
975 | /* See if this argument should be passed by invisible reference. */ | |
ce3fb06e | 976 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type)) |
cb543c54 | 977 | || TREE_ADDRESSABLE (type) |
bbafd9d2 | 978 | || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type), |
cb543c54 | 979 | type, argpos < n_named_args) |
cb543c54 | 980 | ) |
981 | { | |
982 | /* If we're compiling a thunk, pass through invisible | |
983 | references instead of making a copy. */ | |
eaa112a0 | 984 | if (call_from_thunk_p |
bbafd9d2 | 985 | || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type), |
cb543c54 | 986 | type, argpos < n_named_args) |
987 | /* If it's in a register, we must make a copy of it too. */ | |
988 | /* ??? Is this a sufficient test? Is there a better one? */ | |
989 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
990 | && REG_P (DECL_RTL (args[i].tree_value))) | |
991 | && ! TREE_ADDRESSABLE (type)) | |
cb543c54 | 992 | ) |
993 | { | |
994 | /* C++ uses a TARGET_EXPR to indicate that we want to make a | |
995 | new object from the argument. If we are passing by | |
996 | invisible reference, the callee will do that for us, so we | |
997 | can strip off the TARGET_EXPR. This is not always safe, | |
998 | but it is safe in the only case where this is a useful | |
999 | optimization; namely, when the argument is a plain object. | |
1000 | In that case, the frontend is just asking the backend to | |
c87678e4 | 1001 | make a bitwise copy of the argument. */ |
1002 | ||
cb543c54 | 1003 | if (TREE_CODE (args[i].tree_value) == TARGET_EXPR |
9308e976 | 1004 | && (DECL_P (TREE_OPERAND (args[i].tree_value, 1))) |
cb543c54 | 1005 | && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1)))) |
1006 | args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1); | |
1007 | ||
c71e72dd | 1008 | /* We can't use sibcalls if a callee-copied argument is stored |
1009 | in the current function's frame. */ | |
1010 | if (!call_from_thunk_p | |
1011 | && (!DECL_P (args[i].tree_value) | |
1012 | || !TREE_STATIC (args[i].tree_value))) | |
1013 | *may_tailcall = false; | |
1014 | ||
cb543c54 | 1015 | args[i].tree_value = build1 (ADDR_EXPR, |
1016 | build_pointer_type (type), | |
1017 | args[i].tree_value); | |
1018 | type = build_pointer_type (type); | |
1019 | } | |
ce95a955 | 1020 | else if (TREE_CODE (args[i].tree_value) == TARGET_EXPR) |
1021 | { | |
1022 | /* In the V3 C++ ABI, parameters are destroyed in the caller. | |
1023 | We implement this by passing the address of the temporary | |
1024 | rather than expanding it into another allocated slot. */ | |
1025 | args[i].tree_value = build1 (ADDR_EXPR, | |
1026 | build_pointer_type (type), | |
1027 | args[i].tree_value); | |
1028 | type = build_pointer_type (type); | |
4ee9c684 | 1029 | *may_tailcall = false; |
ce95a955 | 1030 | } |
cb543c54 | 1031 | else |
1032 | { | |
1033 | /* We make a copy of the object and pass the address to the | |
1034 | function being called. */ | |
1035 | rtx copy; | |
1036 | ||
4b72716d | 1037 | if (!COMPLETE_TYPE_P (type) |
cb543c54 | 1038 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1039 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
a0c2c45b | 1040 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1041 | STACK_CHECK_MAX_VAR_SIZE)))) | |
cb543c54 | 1042 | { |
1043 | /* This is a variable-sized object. Make space on the stack | |
1044 | for it. */ | |
1045 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1046 | ||
1047 | if (*old_stack_level == 0) | |
1048 | { | |
1049 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1050 | *old_pending_adj = pending_stack_adjust; | |
1051 | pending_stack_adjust = 0; | |
1052 | } | |
1053 | ||
1054 | copy = gen_rtx_MEM (BLKmode, | |
f7c44134 | 1055 | allocate_dynamic_stack_space |
1056 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1057 | set_mem_attributes (copy, type, 1); | |
cb543c54 | 1058 | } |
1059 | else | |
f7c44134 | 1060 | copy = assign_temp (type, 0, 1, 0); |
cb543c54 | 1061 | |
1062 | store_expr (args[i].tree_value, copy, 0); | |
2a0c81bf | 1063 | *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
cb543c54 | 1064 | |
1065 | args[i].tree_value = build1 (ADDR_EXPR, | |
1066 | build_pointer_type (type), | |
1067 | make_tree (type, copy)); | |
1068 | type = build_pointer_type (type); | |
4ee9c684 | 1069 | *may_tailcall = false; |
cb543c54 | 1070 | } |
1071 | } | |
1072 | ||
1073 | mode = TYPE_MODE (type); | |
78a8ed03 | 1074 | unsignedp = TYPE_UNSIGNED (type); |
cb543c54 | 1075 | |
45550790 | 1076 | if (targetm.calls.promote_function_args (fndecl ? TREE_TYPE (fndecl) : 0)) |
1077 | mode = promote_mode (type, mode, &unsignedp, 1); | |
cb543c54 | 1078 | |
1079 | args[i].unsignedp = unsignedp; | |
1080 | args[i].mode = mode; | |
7a8d641b | 1081 | |
0e0be288 | 1082 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1083 | argpos < n_named_args); | |
7a8d641b | 1084 | #ifdef FUNCTION_INCOMING_ARG |
1085 | /* If this is a sibling call and the machine has register windows, the | |
1086 | register window has to be unwinded before calling the routine, so | |
1087 | arguments have to go into the incoming registers. */ | |
0e0be288 | 1088 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
c87678e4 | 1089 | argpos < n_named_args); |
0e0be288 | 1090 | #else |
1091 | args[i].tail_call_reg = args[i].reg; | |
7a8d641b | 1092 | #endif |
7a8d641b | 1093 | |
cb543c54 | 1094 | if (args[i].reg) |
1095 | args[i].partial | |
bbafd9d2 | 1096 | = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type, |
cb543c54 | 1097 | argpos < n_named_args); |
cb543c54 | 1098 | |
1099 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); | |
1100 | ||
1101 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1102 | it means that we are to pass this arg in the register(s) designated | |
1103 | by the PARALLEL, but also to pass it in the stack. */ | |
1104 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1105 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1106 | args[i].pass_on_stack = 1; | |
1107 | ||
1108 | /* If this is an addressable type, we must preallocate the stack | |
1109 | since we must evaluate the object into its final location. | |
1110 | ||
1111 | If this is to be passed in both registers and the stack, it is simpler | |
1112 | to preallocate. */ | |
1113 | if (TREE_ADDRESSABLE (type) | |
1114 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1115 | *must_preallocate = 1; | |
1116 | ||
1117 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1118 | we cannot consider this function call constant. */ | |
1119 | if (TREE_ADDRESSABLE (type)) | |
2a0c81bf | 1120 | *ecf_flags &= ~ECF_LIBCALL_BLOCK; |
cb543c54 | 1121 | |
1122 | /* Compute the stack-size of this argument. */ | |
1123 | if (args[i].reg == 0 || args[i].partial != 0 | |
1124 | || reg_parm_stack_space > 0 | |
1125 | || args[i].pass_on_stack) | |
1126 | locate_and_pad_parm (mode, type, | |
1127 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1128 | 1, | |
1129 | #else | |
1130 | args[i].reg != 0, | |
1131 | #endif | |
241399f6 | 1132 | args[i].pass_on_stack ? 0 : args[i].partial, |
1133 | fndecl, args_size, &args[i].locate); | |
0fee47f4 | 1134 | #ifdef BLOCK_REG_PADDING |
1135 | else | |
1136 | /* The argument is passed entirely in registers. See at which | |
1137 | end it should be padded. */ | |
1138 | args[i].locate.where_pad = | |
1139 | BLOCK_REG_PADDING (mode, type, | |
1140 | int_size_in_bytes (type) <= UNITS_PER_WORD); | |
1141 | #endif | |
c87678e4 | 1142 | |
cb543c54 | 1143 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1144 | ||
241399f6 | 1145 | args_size->constant += args[i].locate.size.constant; |
1146 | if (args[i].locate.size.var) | |
1147 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
cb543c54 | 1148 | |
1149 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1150 | have been used, etc. */ | |
1151 | ||
bbafd9d2 | 1152 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
cb543c54 | 1153 | argpos < n_named_args); |
1154 | } | |
1155 | } | |
1156 | ||
cc45e5e8 | 1157 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1158 | Return the original constant component of the argument block's size. | |
1159 | ||
1160 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1161 | for arguments passed in registers. */ | |
1162 | ||
1163 | static int | |
4c9e08a4 | 1164 | compute_argument_block_size (int reg_parm_stack_space, |
1165 | struct args_size *args_size, | |
1166 | int preferred_stack_boundary ATTRIBUTE_UNUSED) | |
cc45e5e8 | 1167 | { |
1168 | int unadjusted_args_size = args_size->constant; | |
1169 | ||
4448f543 | 1170 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1171 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
35a3065a | 1172 | backends from generating misaligned frame sizes. */ |
4448f543 | 1173 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1174 | preferred_stack_boundary = STACK_BOUNDARY; | |
4448f543 | 1175 | |
cc45e5e8 | 1176 | /* Compute the actual size of the argument block required. The variable |
1177 | and constant sizes must be combined, the size may have to be rounded, | |
1178 | and there may be a minimum required size. */ | |
1179 | ||
1180 | if (args_size->var) | |
1181 | { | |
1182 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1183 | args_size->constant = 0; | |
1184 | ||
d0285dd8 | 1185 | preferred_stack_boundary /= BITS_PER_UNIT; |
1186 | if (preferred_stack_boundary > 1) | |
91b70175 | 1187 | { |
1188 | /* We don't handle this case yet. To handle it correctly we have | |
35a3065a | 1189 | to add the delta, round and subtract the delta. |
91b70175 | 1190 | Currently no machine description requires this support. */ |
1191 | if (stack_pointer_delta & (preferred_stack_boundary - 1)) | |
c87678e4 | 1192 | abort (); |
91b70175 | 1193 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1194 | } | |
cc45e5e8 | 1195 | |
1196 | if (reg_parm_stack_space > 0) | |
1197 | { | |
1198 | args_size->var | |
1199 | = size_binop (MAX_EXPR, args_size->var, | |
902de8ed | 1200 | ssize_int (reg_parm_stack_space)); |
cc45e5e8 | 1201 | |
1202 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1203 | /* The area corresponding to register parameters is not to count in | |
1204 | the size of the block we need. So make the adjustment. */ | |
1205 | args_size->var | |
1206 | = size_binop (MINUS_EXPR, args_size->var, | |
902de8ed | 1207 | ssize_int (reg_parm_stack_space)); |
cc45e5e8 | 1208 | #endif |
1209 | } | |
1210 | } | |
1211 | else | |
1212 | { | |
d0285dd8 | 1213 | preferred_stack_boundary /= BITS_PER_UNIT; |
60ecc450 | 1214 | if (preferred_stack_boundary < 1) |
1215 | preferred_stack_boundary = 1; | |
e39fae61 | 1216 | args_size->constant = (((args_size->constant |
91b70175 | 1217 | + stack_pointer_delta |
d0285dd8 | 1218 | + preferred_stack_boundary - 1) |
1219 | / preferred_stack_boundary | |
1220 | * preferred_stack_boundary) | |
91b70175 | 1221 | - stack_pointer_delta); |
cc45e5e8 | 1222 | |
1223 | args_size->constant = MAX (args_size->constant, | |
1224 | reg_parm_stack_space); | |
1225 | ||
cc45e5e8 | 1226 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
1227 | args_size->constant -= reg_parm_stack_space; | |
1228 | #endif | |
1229 | } | |
1230 | return unadjusted_args_size; | |
1231 | } | |
1232 | ||
caa1595a | 1233 | /* Precompute parameters as needed for a function call. |
04707f1c | 1234 | |
dfe08167 | 1235 | FLAGS is mask of ECF_* constants. |
04707f1c | 1236 | |
04707f1c | 1237 | NUM_ACTUALS is the number of arguments. |
1238 | ||
c87678e4 | 1239 | ARGS is an array containing information for each argument; this |
1240 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1241 | precomputed argument. */ | |
04707f1c | 1242 | |
1243 | static void | |
4c9e08a4 | 1244 | precompute_arguments (int flags, int num_actuals, struct arg_data *args) |
04707f1c | 1245 | { |
1246 | int i; | |
1247 | ||
8c78c14b | 1248 | /* If this is a libcall, then precompute all arguments so that we do not |
67c155cb | 1249 | get extraneous instructions emitted as part of the libcall sequence. */ |
1250 | if ((flags & ECF_LIBCALL_BLOCK) == 0) | |
1251 | return; | |
1252 | ||
04707f1c | 1253 | for (i = 0; i < num_actuals; i++) |
67c155cb | 1254 | { |
1255 | enum machine_mode mode; | |
701e46d0 | 1256 | |
67c155cb | 1257 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
1258 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) | |
1259 | abort (); | |
04707f1c | 1260 | |
67c155cb | 1261 | args[i].value |
1262 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); | |
04707f1c | 1263 | |
67c155cb | 1264 | /* ANSI doesn't require a sequence point here, |
1265 | but PCC has one, so this will avoid some problems. */ | |
1266 | emit_queue (); | |
04707f1c | 1267 | |
67c155cb | 1268 | args[i].initial_value = args[i].value |
1269 | = protect_from_queue (args[i].value, 0); | |
04707f1c | 1270 | |
67c155cb | 1271 | mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); |
1272 | if (mode != args[i].mode) | |
1273 | { | |
1274 | args[i].value | |
1275 | = convert_modes (args[i].mode, mode, | |
1276 | args[i].value, args[i].unsignedp); | |
7752d341 | 1277 | #if defined(PROMOTE_FUNCTION_MODE) && !defined(PROMOTE_MODE) |
67c155cb | 1278 | /* CSE will replace this only if it contains args[i].value |
1279 | pseudo, so convert it down to the declared mode using | |
1280 | a SUBREG. */ | |
1281 | if (REG_P (args[i].value) | |
1282 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1283 | { | |
1284 | args[i].initial_value | |
1285 | = gen_lowpart_SUBREG (mode, args[i].value); | |
1286 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
1287 | SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, | |
1288 | args[i].unsignedp); | |
1289 | } | |
c41c7d7a | 1290 | #endif |
67c155cb | 1291 | } |
1292 | } | |
04707f1c | 1293 | } |
1294 | ||
e717ffc2 | 1295 | /* Given the current state of MUST_PREALLOCATE and information about |
1296 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1297 | compute and return the final value for MUST_PREALLOCATE. */ | |
1298 | ||
1299 | static int | |
4c9e08a4 | 1300 | finalize_must_preallocate (int must_preallocate, int num_actuals, struct arg_data *args, struct args_size *args_size) |
e717ffc2 | 1301 | { |
1302 | /* See if we have or want to preallocate stack space. | |
1303 | ||
1304 | If we would have to push a partially-in-regs parm | |
1305 | before other stack parms, preallocate stack space instead. | |
1306 | ||
1307 | If the size of some parm is not a multiple of the required stack | |
1308 | alignment, we must preallocate. | |
1309 | ||
1310 | If the total size of arguments that would otherwise create a copy in | |
1311 | a temporary (such as a CALL) is more than half the total argument list | |
1312 | size, preallocation is faster. | |
1313 | ||
1314 | Another reason to preallocate is if we have a machine (like the m88k) | |
1315 | where stack alignment is required to be maintained between every | |
1316 | pair of insns, not just when the call is made. However, we assume here | |
1317 | that such machines either do not have push insns (and hence preallocation | |
1318 | would occur anyway) or the problem is taken care of with | |
1319 | PUSH_ROUNDING. */ | |
1320 | ||
1321 | if (! must_preallocate) | |
1322 | { | |
1323 | int partial_seen = 0; | |
1324 | int copy_to_evaluate_size = 0; | |
1325 | int i; | |
1326 | ||
1327 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1328 | { | |
1329 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1330 | partial_seen = 1; | |
1331 | else if (partial_seen && args[i].reg == 0) | |
1332 | must_preallocate = 1; | |
1333 | ||
1334 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1335 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1336 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1337 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1338 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1339 | copy_to_evaluate_size | |
1340 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1341 | } | |
1342 | ||
1343 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1344 | && args_size->constant > 0) | |
1345 | must_preallocate = 1; | |
1346 | } | |
1347 | return must_preallocate; | |
1348 | } | |
cc45e5e8 | 1349 | |
f3012854 | 1350 | /* If we preallocated stack space, compute the address of each argument |
1351 | and store it into the ARGS array. | |
1352 | ||
c87678e4 | 1353 | We need not ensure it is a valid memory address here; it will be |
f3012854 | 1354 | validized when it is used. |
1355 | ||
1356 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1357 | ||
1358 | static void | |
4c9e08a4 | 1359 | compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) |
f3012854 | 1360 | { |
1361 | if (argblock) | |
1362 | { | |
1363 | rtx arg_reg = argblock; | |
1364 | int i, arg_offset = 0; | |
1365 | ||
1366 | if (GET_CODE (argblock) == PLUS) | |
1367 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1368 | ||
1369 | for (i = 0; i < num_actuals; i++) | |
1370 | { | |
241399f6 | 1371 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1372 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
f3012854 | 1373 | rtx addr; |
1374 | ||
1375 | /* Skip this parm if it will not be passed on the stack. */ | |
1376 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1377 | continue; | |
1378 | ||
1379 | if (GET_CODE (offset) == CONST_INT) | |
1380 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1381 | else | |
1382 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1383 | ||
1384 | addr = plus_constant (addr, arg_offset); | |
1385 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
2a68cb1e | 1386 | set_mem_align (args[i].stack, PARM_BOUNDARY); |
f7c44134 | 1387 | set_mem_attributes (args[i].stack, |
1388 | TREE_TYPE (args[i].tree_value), 1); | |
f3012854 | 1389 | |
1390 | if (GET_CODE (slot_offset) == CONST_INT) | |
1391 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1392 | else | |
1393 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1394 | ||
1395 | addr = plus_constant (addr, arg_offset); | |
1396 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
2a68cb1e | 1397 | set_mem_align (args[i].stack_slot, PARM_BOUNDARY); |
f7c44134 | 1398 | set_mem_attributes (args[i].stack_slot, |
1399 | TREE_TYPE (args[i].tree_value), 1); | |
a9f2963b | 1400 | |
1401 | /* Function incoming arguments may overlap with sibling call | |
1402 | outgoing arguments and we cannot allow reordering of reads | |
1403 | from function arguments with stores to outgoing arguments | |
1404 | of sibling calls. */ | |
ab6ab77e | 1405 | set_mem_alias_set (args[i].stack, 0); |
1406 | set_mem_alias_set (args[i].stack_slot, 0); | |
f3012854 | 1407 | } |
1408 | } | |
1409 | } | |
c87678e4 | 1410 | |
f3012854 | 1411 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1412 | in a call instruction. | |
1413 | ||
1414 | FNDECL is the tree node for the target function. For an indirect call | |
1415 | FNDECL will be NULL_TREE. | |
1416 | ||
95672afe | 1417 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
f3012854 | 1418 | |
1419 | static rtx | |
4c9e08a4 | 1420 | rtx_for_function_call (tree fndecl, tree addr) |
f3012854 | 1421 | { |
1422 | rtx funexp; | |
1423 | ||
1424 | /* Get the function to call, in the form of RTL. */ | |
1425 | if (fndecl) | |
1426 | { | |
1427 | /* If this is the first use of the function, see if we need to | |
1428 | make an external definition for it. */ | |
1429 | if (! TREE_USED (fndecl)) | |
1430 | { | |
1431 | assemble_external (fndecl); | |
1432 | TREE_USED (fndecl) = 1; | |
1433 | } | |
1434 | ||
1435 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1436 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1437 | } | |
1438 | else | |
1439 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1440 | { | |
1441 | push_temp_slots (); | |
95672afe | 1442 | funexp = expand_expr (addr, NULL_RTX, VOIDmode, 0); |
c87678e4 | 1443 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
f3012854 | 1444 | emit_queue (); |
1445 | } | |
1446 | return funexp; | |
1447 | } | |
1448 | ||
cde25025 | 1449 | /* Do the register loads required for any wholly-register parms or any |
1450 | parms which are passed both on the stack and in a register. Their | |
c87678e4 | 1451 | expressions were already evaluated. |
cde25025 | 1452 | |
1453 | Mark all register-parms as living through the call, putting these USE | |
4c9e08a4 | 1454 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1455 | ||
42b11544 | 1456 | When IS_SIBCALL, perform the check_sibcall_overlap_argument_overlap |
1457 | checking, setting *SIBCALL_FAILURE if appropriate. */ | |
cde25025 | 1458 | |
1459 | static void | |
4c9e08a4 | 1460 | load_register_parameters (struct arg_data *args, int num_actuals, |
1461 | rtx *call_fusage, int flags, int is_sibcall, | |
1462 | int *sibcall_failure) | |
cde25025 | 1463 | { |
1464 | int i, j; | |
1465 | ||
cde25025 | 1466 | for (i = 0; i < num_actuals; i++) |
cde25025 | 1467 | { |
0e0be288 | 1468 | rtx reg = ((flags & ECF_SIBCALL) |
1469 | ? args[i].tail_call_reg : args[i].reg); | |
cde25025 | 1470 | if (reg) |
1471 | { | |
5f4cd670 | 1472 | int partial = args[i].partial; |
1473 | int nregs; | |
1474 | int size = 0; | |
42b11544 | 1475 | rtx before_arg = get_last_insn (); |
cde25025 | 1476 | /* Set to non-negative if must move a word at a time, even if just |
1477 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1478 | we just use a normal move insn. This value can be zero if the | |
1479 | argument is a zero size structure with no fields. */ | |
5f4cd670 | 1480 | nregs = -1; |
1481 | if (partial) | |
1482 | nregs = partial; | |
1483 | else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) | |
1484 | { | |
1485 | size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1486 | nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1487 | } | |
1488 | else | |
1489 | size = GET_MODE_SIZE (args[i].mode); | |
cde25025 | 1490 | |
1491 | /* Handle calls that pass values in multiple non-contiguous | |
1492 | locations. The Irix 6 ABI has examples of this. */ | |
1493 | ||
1494 | if (GET_CODE (reg) == PARALLEL) | |
5f4cd670 | 1495 | { |
1496 | tree type = TREE_TYPE (args[i].tree_value); | |
1497 | emit_group_load (reg, args[i].value, type, | |
1498 | int_size_in_bytes (type)); | |
1499 | } | |
cde25025 | 1500 | |
1501 | /* If simple case, just do move. If normal partial, store_one_arg | |
1502 | has already loaded the register for us. In all other cases, | |
1503 | load the register(s) from memory. */ | |
1504 | ||
8e67abab | 1505 | else if (nregs == -1) |
1506 | { | |
1507 | emit_move_insn (reg, args[i].value); | |
5f4cd670 | 1508 | #ifdef BLOCK_REG_PADDING |
8e67abab | 1509 | /* Handle case where we have a value that needs shifting |
1510 | up to the msb. eg. a QImode value and we're padding | |
1511 | upward on a BYTES_BIG_ENDIAN machine. */ | |
1512 | if (size < UNITS_PER_WORD | |
1513 | && (args[i].locate.where_pad | |
1514 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1515 | { | |
8e67abab | 1516 | rtx x; |
1517 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
b2abd798 | 1518 | |
1519 | /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
1520 | report the whole reg as used. Strictly speaking, the | |
1521 | call only uses SIZE bytes at the msb end, but it doesn't | |
1522 | seem worth generating rtl to say that. */ | |
1523 | reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
92966f8b | 1524 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, |
1525 | build_int_2 (shift, 0), reg, 1); | |
b2abd798 | 1526 | if (x != reg) |
1527 | emit_move_insn (reg, x); | |
8e67abab | 1528 | } |
5f4cd670 | 1529 | #endif |
8e67abab | 1530 | } |
cde25025 | 1531 | |
1532 | /* If we have pre-computed the values to put in the registers in | |
1533 | the case of non-aligned structures, copy them in now. */ | |
1534 | ||
1535 | else if (args[i].n_aligned_regs != 0) | |
1536 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1537 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1538 | args[i].aligned_regs[j]); | |
1539 | ||
1540 | else if (partial == 0 || args[i].pass_on_stack) | |
5f4cd670 | 1541 | { |
1542 | rtx mem = validize_mem (args[i].value); | |
1543 | ||
5f4cd670 | 1544 | /* Handle a BLKmode that needs shifting. */ |
8e67abab | 1545 | if (nregs == 1 && size < UNITS_PER_WORD |
2c267f1a | 1546 | #ifdef BLOCK_REG_PADDING |
1547 | && args[i].locate.where_pad == downward | |
1548 | #else | |
1549 | && BYTES_BIG_ENDIAN | |
1550 | #endif | |
1551 | ) | |
5f4cd670 | 1552 | { |
1553 | rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1554 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1555 | rtx x = gen_reg_rtx (word_mode); | |
1556 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
92966f8b | 1557 | enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR |
1558 | : LSHIFT_EXPR; | |
5f4cd670 | 1559 | |
1560 | emit_move_insn (x, tem); | |
92966f8b | 1561 | x = expand_shift (dir, word_mode, x, |
1562 | build_int_2 (shift, 0), ri, 1); | |
5f4cd670 | 1563 | if (x != ri) |
1564 | emit_move_insn (ri, x); | |
1565 | } | |
1566 | else | |
5f4cd670 | 1567 | move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); |
1568 | } | |
cde25025 | 1569 | |
42b11544 | 1570 | /* When a parameter is a block, and perhaps in other cases, it is |
1571 | possible that it did a load from an argument slot that was | |
6a8fa8e2 | 1572 | already clobbered. */ |
42b11544 | 1573 | if (is_sibcall |
1574 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1575 | *sibcall_failure = 1; | |
1576 | ||
cde25025 | 1577 | /* Handle calls that pass values in multiple non-contiguous |
1578 | locations. The Irix 6 ABI has examples of this. */ | |
1579 | if (GET_CODE (reg) == PARALLEL) | |
1580 | use_group_regs (call_fusage, reg); | |
1581 | else if (nregs == -1) | |
1582 | use_reg (call_fusage, reg); | |
1583 | else | |
1584 | use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); | |
1585 | } | |
1586 | } | |
1587 | } | |
1588 | ||
92e1ef5b | 1589 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1590 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1591 | bytes, then we would need to push some additional bytes to pad the | |
481feae3 | 1592 | arguments. So, we compute an adjust to the stack pointer for an |
1593 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1594 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1595 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1596 | be popped after the call. Returns the adjustment. */ | |
92e1ef5b | 1597 | |
481feae3 | 1598 | static int |
4c9e08a4 | 1599 | combine_pending_stack_adjustment_and_call (int unadjusted_args_size, |
1600 | struct args_size *args_size, | |
1601 | int preferred_unit_stack_boundary) | |
92e1ef5b | 1602 | { |
1603 | /* The number of bytes to pop so that the stack will be | |
1604 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1605 | HOST_WIDE_INT adjustment; | |
1606 | /* The alignment of the stack after the arguments are pushed, if we | |
1607 | just pushed the arguments without adjust the stack here. */ | |
1608 | HOST_WIDE_INT unadjusted_alignment; | |
1609 | ||
c87678e4 | 1610 | unadjusted_alignment |
92e1ef5b | 1611 | = ((stack_pointer_delta + unadjusted_args_size) |
1612 | % preferred_unit_stack_boundary); | |
1613 | ||
1614 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1615 | as possible -- leaving just enough left to cancel out the | |
1616 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1617 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1618 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1619 | ||
1620 | /* Begin by trying to pop all the bytes. */ | |
c87678e4 | 1621 | unadjusted_alignment |
1622 | = (unadjusted_alignment | |
92e1ef5b | 1623 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1624 | adjustment = pending_stack_adjust; | |
1625 | /* Push enough additional bytes that the stack will be aligned | |
1626 | after the arguments are pushed. */ | |
d3ef58ec | 1627 | if (preferred_unit_stack_boundary > 1) |
1628 | { | |
3dc35e62 | 1629 | if (unadjusted_alignment > 0) |
c87678e4 | 1630 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
d3ef58ec | 1631 | else |
c87678e4 | 1632 | adjustment += unadjusted_alignment; |
d3ef58ec | 1633 | } |
c87678e4 | 1634 | |
92e1ef5b | 1635 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1636 | bytes after the call. The right number is the entire | |
1637 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1638 | by the arguments in the first place. */ | |
c87678e4 | 1639 | args_size->constant |
92e1ef5b | 1640 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1641 | ||
481feae3 | 1642 | return adjustment; |
92e1ef5b | 1643 | } |
1644 | ||
7ecc63d3 | 1645 | /* Scan X expression if it does not dereference any argument slots |
1646 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1647 | bitmap). | |
d10cfa8d | 1648 | Return nonzero if X expression dereferences such argument slots, |
7ecc63d3 | 1649 | zero otherwise. */ |
1650 | ||
1651 | static int | |
4c9e08a4 | 1652 | check_sibcall_argument_overlap_1 (rtx x) |
7ecc63d3 | 1653 | { |
1654 | RTX_CODE code; | |
1655 | int i, j; | |
1656 | unsigned int k; | |
1657 | const char *fmt; | |
1658 | ||
1659 | if (x == NULL_RTX) | |
1660 | return 0; | |
1661 | ||
1662 | code = GET_CODE (x); | |
1663 | ||
1664 | if (code == MEM) | |
1665 | { | |
1666 | if (XEXP (x, 0) == current_function_internal_arg_pointer) | |
1667 | i = 0; | |
57679d39 | 1668 | else if (GET_CODE (XEXP (x, 0)) == PLUS |
1669 | && XEXP (XEXP (x, 0), 0) == | |
1670 | current_function_internal_arg_pointer | |
1671 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
7ecc63d3 | 1672 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
1673 | else | |
1674 | return 0; | |
1675 | ||
db10eec8 | 1676 | #ifdef ARGS_GROW_DOWNWARD |
1677 | i = -i - GET_MODE_SIZE (GET_MODE (x)); | |
1678 | #endif | |
1679 | ||
7ecc63d3 | 1680 | for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++) |
1681 | if (i + k < stored_args_map->n_bits | |
1682 | && TEST_BIT (stored_args_map, i + k)) | |
1683 | return 1; | |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
c87678e4 | 1688 | /* Scan all subexpressions. */ |
7ecc63d3 | 1689 | fmt = GET_RTX_FORMAT (code); |
1690 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1691 | { | |
1692 | if (*fmt == 'e') | |
c87678e4 | 1693 | { |
1694 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1695 | return 1; | |
1696 | } | |
7ecc63d3 | 1697 | else if (*fmt == 'E') |
c87678e4 | 1698 | { |
1699 | for (j = 0; j < XVECLEN (x, i); j++) | |
1700 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1701 | return 1; | |
1702 | } | |
7ecc63d3 | 1703 | } |
1704 | return 0; | |
7ecc63d3 | 1705 | } |
1706 | ||
1707 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1708 | we already clobbered by tail call arguments (as noted in stored_args_map | |
42b11544 | 1709 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
1710 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1711 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1712 | slots, zero otherwise. */ | |
7ecc63d3 | 1713 | |
1714 | static int | |
4c9e08a4 | 1715 | check_sibcall_argument_overlap (rtx insn, struct arg_data *arg, int mark_stored_args_map) |
c87678e4 | 1716 | { |
7ecc63d3 | 1717 | int low, high; |
1718 | ||
1719 | if (insn == NULL_RTX) | |
1720 | insn = get_insns (); | |
1721 | else | |
1722 | insn = NEXT_INSN (insn); | |
1723 | ||
1724 | for (; insn; insn = NEXT_INSN (insn)) | |
c87678e4 | 1725 | if (INSN_P (insn) |
1726 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
7ecc63d3 | 1727 | break; |
1728 | ||
42b11544 | 1729 | if (mark_stored_args_map) |
1730 | { | |
db10eec8 | 1731 | #ifdef ARGS_GROW_DOWNWARD |
241399f6 | 1732 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
db10eec8 | 1733 | #else |
241399f6 | 1734 | low = arg->locate.slot_offset.constant; |
db10eec8 | 1735 | #endif |
1736 | ||
241399f6 | 1737 | for (high = low + arg->locate.size.constant; low < high; low++) |
42b11544 | 1738 | SET_BIT (stored_args_map, low); |
1739 | } | |
7ecc63d3 | 1740 | return insn != NULL_RTX; |
1741 | } | |
1742 | ||
f1eb2fdd | 1743 | static tree |
4c9e08a4 | 1744 | fix_unsafe_tree (tree t) |
f1eb2fdd | 1745 | { |
1746 | switch (unsafe_for_reeval (t)) | |
1747 | { | |
1748 | case 0: /* Safe. */ | |
1749 | break; | |
1750 | ||
1751 | case 1: /* Mildly unsafe. */ | |
1752 | t = unsave_expr (t); | |
1753 | break; | |
1754 | ||
1755 | case 2: /* Wildly unsafe. */ | |
1756 | { | |
1757 | tree var = build_decl (VAR_DECL, NULL_TREE, | |
1758 | TREE_TYPE (t)); | |
1759 | SET_DECL_RTL (var, | |
1760 | expand_expr (t, NULL_RTX, VOIDmode, EXPAND_NORMAL)); | |
1761 | t = var; | |
1762 | } | |
1763 | break; | |
1764 | ||
1765 | default: | |
1766 | abort (); | |
1767 | } | |
1768 | return t; | |
1769 | } | |
1770 | ||
2c8ff1ed | 1771 | |
1772 | /* If function value *VALUE was returned at the most significant end of a | |
1773 | register, shift it towards the least significant end and convert it to | |
1774 | TYPE's mode. Return true and update *VALUE if some action was needed. | |
1775 | ||
1776 | TYPE is the type of the function's return value, which is known not | |
1777 | to have mode BLKmode. */ | |
1778 | ||
1779 | static bool | |
1780 | shift_returned_value (tree type, rtx *value) | |
1781 | { | |
1782 | if (targetm.calls.return_in_msb (type)) | |
1783 | { | |
1784 | HOST_WIDE_INT shift; | |
1785 | ||
1786 | shift = (GET_MODE_BITSIZE (GET_MODE (*value)) | |
1787 | - BITS_PER_UNIT * int_size_in_bytes (type)); | |
1788 | if (shift > 0) | |
1789 | { | |
e9ec9980 | 1790 | /* Shift the value into the low part of the register. */ |
2c8ff1ed | 1791 | *value = expand_binop (GET_MODE (*value), lshr_optab, *value, |
1792 | GEN_INT (shift), 0, 1, OPTAB_WIDEN); | |
e9ec9980 | 1793 | |
1794 | /* Truncate it to the type's mode, or its integer equivalent. | |
1795 | This is subject to TRULY_NOOP_TRUNCATION. */ | |
1796 | *value = convert_to_mode (int_mode_for_mode (TYPE_MODE (type)), | |
1797 | *value, 0); | |
1798 | ||
1799 | /* Now convert it to the final form. */ | |
1800 | *value = gen_lowpart (TYPE_MODE (type), *value); | |
2c8ff1ed | 1801 | return true; |
1802 | } | |
1803 | } | |
1804 | return false; | |
1805 | } | |
1806 | ||
4ee9c684 | 1807 | /* Remove all REG_EQUIV notes found in the insn chain. */ |
1808 | ||
1809 | static void | |
1810 | purge_reg_equiv_notes (void) | |
1811 | { | |
1812 | rtx insn; | |
1813 | ||
1814 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
1815 | { | |
1816 | while (1) | |
1817 | { | |
1818 | rtx note = find_reg_note (insn, REG_EQUIV, 0); | |
1819 | if (note) | |
1820 | { | |
1821 | /* Remove the note and keep looking at the notes for | |
1822 | this insn. */ | |
1823 | remove_note (insn, note); | |
1824 | continue; | |
1825 | } | |
1826 | break; | |
1827 | } | |
1828 | } | |
1829 | } | |
1830 | ||
1831 | /* Clear RTX_UNCHANGING_P flag of incoming argument MEMs. */ | |
1832 | ||
1833 | static void | |
1834 | purge_mem_unchanging_flag (rtx x) | |
1835 | { | |
1836 | RTX_CODE code; | |
1837 | int i, j; | |
1838 | const char *fmt; | |
1839 | ||
1840 | if (x == NULL_RTX) | |
1841 | return; | |
1842 | ||
1843 | code = GET_CODE (x); | |
1844 | ||
1845 | if (code == MEM) | |
1846 | { | |
1847 | if (RTX_UNCHANGING_P (x) | |
1848 | && (XEXP (x, 0) == current_function_internal_arg_pointer | |
1849 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
1850 | && XEXP (XEXP (x, 0), 0) == | |
1851 | current_function_internal_arg_pointer | |
1852 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT))) | |
1853 | RTX_UNCHANGING_P (x) = 0; | |
1854 | return; | |
1855 | } | |
1856 | ||
1857 | /* Scan all subexpressions. */ | |
1858 | fmt = GET_RTX_FORMAT (code); | |
1859 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1860 | { | |
1861 | if (*fmt == 'e') | |
1862 | purge_mem_unchanging_flag (XEXP (x, i)); | |
1863 | else if (*fmt == 'E') | |
1864 | for (j = 0; j < XVECLEN (x, i); j++) | |
1865 | purge_mem_unchanging_flag (XVECEXP (x, i, j)); | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | ||
66d433c7 | 1870 | /* Generate all the code for a function call |
1871 | and return an rtx for its value. | |
1872 | Store the value in TARGET (specified as an rtx) if convenient. | |
1873 | If the value is stored in TARGET then TARGET is returned. | |
1874 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
1875 | ||
1876 | rtx | |
4c9e08a4 | 1877 | expand_call (tree exp, rtx target, int ignore) |
66d433c7 | 1878 | { |
60ecc450 | 1879 | /* Nonzero if we are currently expanding a call. */ |
1880 | static int currently_expanding_call = 0; | |
1881 | ||
66d433c7 | 1882 | /* List of actual parameters. */ |
1883 | tree actparms = TREE_OPERAND (exp, 1); | |
1884 | /* RTX for the function to be called. */ | |
1885 | rtx funexp; | |
60ecc450 | 1886 | /* Sequence of insns to perform a normal "call". */ |
1887 | rtx normal_call_insns = NULL_RTX; | |
4ee9c684 | 1888 | /* Sequence of insns to perform a tail "call". */ |
60ecc450 | 1889 | rtx tail_call_insns = NULL_RTX; |
66d433c7 | 1890 | /* Data type of the function. */ |
1891 | tree funtype; | |
915e81b8 | 1892 | tree type_arg_types; |
66d433c7 | 1893 | /* Declaration of the function being called, |
1894 | or 0 if the function is computed (not known by name). */ | |
1895 | tree fndecl = 0; | |
e100aadc | 1896 | /* The type of the function being called. */ |
1897 | tree fntype; | |
4ee9c684 | 1898 | bool try_tail_call = CALL_EXPR_TAILCALL (exp); |
60ecc450 | 1899 | int pass; |
66d433c7 | 1900 | |
1901 | /* Register in which non-BLKmode value will be returned, | |
1902 | or 0 if no value or if value is BLKmode. */ | |
1903 | rtx valreg; | |
1904 | /* Address where we should return a BLKmode value; | |
1905 | 0 if value not BLKmode. */ | |
1906 | rtx structure_value_addr = 0; | |
1907 | /* Nonzero if that address is being passed by treating it as | |
1908 | an extra, implicit first parameter. Otherwise, | |
1909 | it is passed by being copied directly into struct_value_rtx. */ | |
1910 | int structure_value_addr_parm = 0; | |
1911 | /* Size of aggregate value wanted, or zero if none wanted | |
1912 | or if we are using the non-reentrant PCC calling convention | |
1913 | or expecting the value in registers. */ | |
997d68fe | 1914 | HOST_WIDE_INT struct_value_size = 0; |
66d433c7 | 1915 | /* Nonzero if called function returns an aggregate in memory PCC style, |
1916 | by returning the address of where to find it. */ | |
1917 | int pcc_struct_value = 0; | |
45550790 | 1918 | rtx struct_value = 0; |
66d433c7 | 1919 | |
1920 | /* Number of actual parameters in this call, including struct value addr. */ | |
1921 | int num_actuals; | |
1922 | /* Number of named args. Args after this are anonymous ones | |
1923 | and they must all go on the stack. */ | |
1924 | int n_named_args; | |
66d433c7 | 1925 | |
1926 | /* Vector of information about each argument. | |
1927 | Arguments are numbered in the order they will be pushed, | |
1928 | not the order they are written. */ | |
1929 | struct arg_data *args; | |
1930 | ||
1931 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
1932 | struct args_size args_size; | |
0e0be288 | 1933 | struct args_size adjusted_args_size; |
66d433c7 | 1934 | /* Size of arguments before any adjustments (such as rounding). */ |
cc45e5e8 | 1935 | int unadjusted_args_size; |
66d433c7 | 1936 | /* Data on reg parms scanned so far. */ |
1937 | CUMULATIVE_ARGS args_so_far; | |
1938 | /* Nonzero if a reg parm has been scanned. */ | |
1939 | int reg_parm_seen; | |
a50ca374 | 1940 | /* Nonzero if this is an indirect function call. */ |
66d433c7 | 1941 | |
c87678e4 | 1942 | /* Nonzero if we must avoid push-insns in the args for this call. |
66d433c7 | 1943 | If stack space is allocated for register parameters, but not by the |
1944 | caller, then it is preallocated in the fixed part of the stack frame. | |
1945 | So the entire argument block must then be preallocated (i.e., we | |
1946 | ignore PUSH_ROUNDING in that case). */ | |
1947 | ||
4448f543 | 1948 | int must_preallocate = !PUSH_ARGS; |
66d433c7 | 1949 | |
eb2f80f3 | 1950 | /* Size of the stack reserved for parameter registers. */ |
2d7187c2 | 1951 | int reg_parm_stack_space = 0; |
1952 | ||
66d433c7 | 1953 | /* Address of space preallocated for stack parms |
1954 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
1955 | rtx argblock = 0; | |
1956 | ||
dfe08167 | 1957 | /* Mask of ECF_ flags. */ |
1958 | int flags = 0; | |
4448f543 | 1959 | #ifdef REG_PARM_STACK_SPACE |
66d433c7 | 1960 | /* Define the boundary of the register parm stack space that needs to be |
6e96b626 | 1961 | saved, if any. */ |
1962 | int low_to_save, high_to_save; | |
66d433c7 | 1963 | rtx save_area = 0; /* Place that it is saved */ |
1964 | #endif | |
1965 | ||
66d433c7 | 1966 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
1967 | char *initial_stack_usage_map = stack_usage_map; | |
66d433c7 | 1968 | |
9069face | 1969 | int old_stack_allocated; |
1970 | ||
1971 | /* State variables to track stack modifications. */ | |
66d433c7 | 1972 | rtx old_stack_level = 0; |
9069face | 1973 | int old_stack_arg_under_construction = 0; |
65dccdb1 | 1974 | int old_pending_adj = 0; |
66d433c7 | 1975 | int old_inhibit_defer_pop = inhibit_defer_pop; |
9069face | 1976 | |
1977 | /* Some stack pointer alterations we make are performed via | |
1978 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
1979 | which we then also need to save/restore along the way. */ | |
31d035ca | 1980 | int old_stack_pointer_delta = 0; |
9069face | 1981 | |
60ecc450 | 1982 | rtx call_fusage; |
19cb6b50 | 1983 | tree p = TREE_OPERAND (exp, 0); |
95672afe | 1984 | tree addr = TREE_OPERAND (exp, 0); |
19cb6b50 | 1985 | int i; |
92e1ef5b | 1986 | /* The alignment of the stack, in bits. */ |
1987 | HOST_WIDE_INT preferred_stack_boundary; | |
1988 | /* The alignment of the stack, in bytes. */ | |
1989 | HOST_WIDE_INT preferred_unit_stack_boundary; | |
4ee9c684 | 1990 | /* The static chain value to use for this call. */ |
1991 | rtx static_chain_value; | |
dfe08167 | 1992 | /* See if this is "nothrow" function call. */ |
1993 | if (TREE_NOTHROW (exp)) | |
1994 | flags |= ECF_NOTHROW; | |
1995 | ||
4ee9c684 | 1996 | /* See if we can find a DECL-node for the actual function, and get the |
1997 | function attributes (flags) from the function decl or type node. */ | |
97a1590b | 1998 | fndecl = get_callee_fndecl (exp); |
1999 | if (fndecl) | |
66d433c7 | 2000 | { |
e100aadc | 2001 | fntype = TREE_TYPE (fndecl); |
97a1590b | 2002 | flags |= flags_from_decl_or_type (fndecl); |
66d433c7 | 2003 | } |
97a1590b | 2004 | else |
8a8cdb8d | 2005 | { |
e100aadc | 2006 | fntype = TREE_TYPE (TREE_TYPE (p)); |
e100aadc | 2007 | flags |= flags_from_decl_or_type (fntype); |
8a8cdb8d | 2008 | } |
d490e2f2 | 2009 | |
e100aadc | 2010 | struct_value = targetm.calls.struct_value_rtx (fntype, 0); |
45550790 | 2011 | |
4a081ddd | 2012 | /* Warn if this value is an aggregate type, |
2013 | regardless of which calling convention we are using for it. */ | |
2014 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) | |
2015 | warning ("function call has aggregate value"); | |
2016 | ||
2017 | /* If the result of a pure or const function call is ignored (or void), | |
2018 | and none of its arguments are volatile, we can avoid expanding the | |
2019 | call and just evaluate the arguments for side-effects. */ | |
2020 | if ((flags & (ECF_CONST | ECF_PURE)) | |
2021 | && (ignore || target == const0_rtx | |
2022 | || TYPE_MODE (TREE_TYPE (exp)) == VOIDmode)) | |
2023 | { | |
2024 | bool volatilep = false; | |
2025 | tree arg; | |
2026 | ||
2027 | for (arg = actparms; arg; arg = TREE_CHAIN (arg)) | |
2028 | if (TREE_THIS_VOLATILE (TREE_VALUE (arg))) | |
2029 | { | |
2030 | volatilep = true; | |
2031 | break; | |
2032 | } | |
2033 | ||
2034 | if (! volatilep) | |
2035 | { | |
2036 | for (arg = actparms; arg; arg = TREE_CHAIN (arg)) | |
2037 | expand_expr (TREE_VALUE (arg), const0_rtx, | |
2038 | VOIDmode, EXPAND_NORMAL); | |
2039 | return const0_rtx; | |
2040 | } | |
2041 | } | |
2042 | ||
2d7187c2 | 2043 | #ifdef REG_PARM_STACK_SPACE |
2d7187c2 | 2044 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
2045 | #endif | |
2d7187c2 | 2046 | |
4448f543 | 2047 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2048 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
997d68fe | 2049 | must_preallocate = 1; |
2050 | #endif | |
2051 | ||
66d433c7 | 2052 | /* Set up a place to return a structure. */ |
2053 | ||
2054 | /* Cater to broken compilers. */ | |
45550790 | 2055 | if (aggregate_value_p (exp, fndecl)) |
66d433c7 | 2056 | { |
2057 | /* This call returns a big structure. */ | |
2a0c81bf | 2058 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
66d433c7 | 2059 | |
2060 | #ifdef PCC_STATIC_STRUCT_RETURN | |
f49c64ba | 2061 | { |
2062 | pcc_struct_value = 1; | |
f49c64ba | 2063 | } |
2064 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2065 | { | |
2066 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
66d433c7 | 2067 | |
805e22b2 | 2068 | if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (exp)) |
639b7377 | 2069 | { |
af0d3dec | 2070 | /* The structure value address arg is already in actparms. |
2071 | Pull it out. It might be nice to just leave it there, but | |
2072 | we need to set structure_value_addr. */ | |
2073 | tree return_arg = TREE_VALUE (actparms); | |
2074 | actparms = TREE_CHAIN (actparms); | |
2075 | structure_value_addr = expand_expr (return_arg, NULL_RTX, | |
2076 | VOIDmode, EXPAND_NORMAL); | |
639b7377 | 2077 | } |
e16ceb8e | 2078 | else if (target && MEM_P (target)) |
f49c64ba | 2079 | structure_value_addr = XEXP (target, 0); |
2080 | else | |
2081 | { | |
f49c64ba | 2082 | /* For variable-sized objects, we must be called with a target |
2083 | specified. If we were to allocate space on the stack here, | |
2084 | we would have no way of knowing when to free it. */ | |
387bc205 | 2085 | rtx d = assign_temp (TREE_TYPE (exp), 1, 1, 1); |
66d433c7 | 2086 | |
930f0e87 | 2087 | mark_temp_addr_taken (d); |
2088 | structure_value_addr = XEXP (d, 0); | |
f49c64ba | 2089 | target = 0; |
2090 | } | |
2091 | } | |
2092 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
66d433c7 | 2093 | } |
2094 | ||
0e0be288 | 2095 | /* Figure out the amount to which the stack should be aligned. */ |
0e0be288 | 2096 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
28992b23 | 2097 | if (fndecl) |
2098 | { | |
2099 | struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
2100 | if (i && i->preferred_incoming_stack_boundary) | |
2101 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; | |
2102 | } | |
0e0be288 | 2103 | |
2104 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
95672afe | 2105 | funtype = TREE_TYPE (addr); |
0e0be288 | 2106 | if (! POINTER_TYPE_P (funtype)) |
2107 | abort (); | |
2108 | funtype = TREE_TYPE (funtype); | |
2109 | ||
915e81b8 | 2110 | /* Munge the tree to split complex arguments into their imaginary |
2111 | and real parts. */ | |
92d40bc4 | 2112 | if (targetm.calls.split_complex_arg) |
915e81b8 | 2113 | { |
2114 | type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); | |
2115 | actparms = split_complex_values (actparms); | |
2116 | } | |
2117 | else | |
2118 | type_arg_types = TYPE_ARG_TYPES (funtype); | |
2119 | ||
0e0be288 | 2120 | if (flags & ECF_MAY_BE_ALLOCA) |
2121 | current_function_calls_alloca = 1; | |
2122 | ||
2123 | /* If struct_value_rtx is 0, it means pass the address | |
2124 | as if it were an extra parameter. */ | |
45550790 | 2125 | if (structure_value_addr && struct_value == 0) |
0e0be288 | 2126 | { |
2127 | /* If structure_value_addr is a REG other than | |
2128 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2129 | is not a REG, we must always copy it into a register. | |
2130 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2131 | register in some cases. */ | |
8ad4c111 | 2132 | rtx temp = (!REG_P (structure_value_addr) |
0e0be288 | 2133 | || (ACCUMULATE_OUTGOING_ARGS |
2134 | && stack_arg_under_construction | |
2135 | && structure_value_addr == virtual_outgoing_args_rtx) | |
e100aadc | 2136 | ? copy_addr_to_reg (convert_memory_address |
2137 | (Pmode, structure_value_addr)) | |
0e0be288 | 2138 | : structure_value_addr); |
2139 | ||
2140 | actparms | |
2141 | = tree_cons (error_mark_node, | |
2142 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2143 | temp), | |
2144 | actparms); | |
2145 | structure_value_addr_parm = 1; | |
2146 | } | |
2147 | ||
2148 | /* Count the arguments and set NUM_ACTUALS. */ | |
2149 | for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p)) | |
2150 | num_actuals++; | |
2151 | ||
2152 | /* Compute number of named args. | |
30a10006 | 2153 | First, do a raw count of the args for INIT_CUMULATIVE_ARGS. */ |
2154 | ||
2155 | if (type_arg_types != 0) | |
2156 | n_named_args | |
2157 | = (list_length (type_arg_types) | |
2158 | /* Count the struct value address, if it is passed as a parm. */ | |
2159 | + structure_value_addr_parm); | |
2160 | else | |
2161 | /* If we know nothing, treat all args as named. */ | |
2162 | n_named_args = num_actuals; | |
2163 | ||
2164 | /* Start updating where the next arg would go. | |
2165 | ||
2166 | On some machines (such as the PA) indirect calls have a different | |
2167 | calling convention than normal calls. The fourth argument in | |
2168 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2169 | or not. */ | |
2170 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl, n_named_args); | |
2171 | ||
2172 | /* Now possibly adjust the number of named args. | |
0e0be288 | 2173 | Normally, don't include the last named arg if anonymous args follow. |
8bdddbd1 | 2174 | We do include the last named arg if |
2175 | targetm.calls.strict_argument_naming() returns nonzero. | |
0e0be288 | 2176 | (If no anonymous args follow, the result of list_length is actually |
2177 | one too large. This is harmless.) | |
2178 | ||
a107cd89 | 2179 | If targetm.calls.pretend_outgoing_varargs_named() returns |
8bdddbd1 | 2180 | nonzero, and targetm.calls.strict_argument_naming() returns zero, |
2181 | this machine will be able to place unnamed args that were passed | |
2182 | in registers into the stack. So treat all args as named. This | |
2183 | allows the insns emitting for a specific argument list to be | |
2184 | independent of the function declaration. | |
a107cd89 | 2185 | |
2186 | If targetm.calls.pretend_outgoing_varargs_named() returns zero, | |
2187 | we do not have any reliable way to pass unnamed args in | |
2188 | registers, so we must force them into memory. */ | |
0e0be288 | 2189 | |
30a10006 | 2190 | if (type_arg_types != 0 |
2191 | && targetm.calls.strict_argument_naming (&args_so_far)) | |
2192 | ; | |
2193 | else if (type_arg_types != 0 | |
2194 | && ! targetm.calls.pretend_outgoing_varargs_named (&args_so_far)) | |
2195 | /* Don't include the last named arg. */ | |
2196 | --n_named_args; | |
0e0be288 | 2197 | else |
30a10006 | 2198 | /* Treat all args as named. */ |
0e0be288 | 2199 | n_named_args = num_actuals; |
2200 | ||
0e0be288 | 2201 | /* Make a vector to hold all the information about each arg. */ |
f0af5a88 | 2202 | args = alloca (num_actuals * sizeof (struct arg_data)); |
2203 | memset (args, 0, num_actuals * sizeof (struct arg_data)); | |
0e0be288 | 2204 | |
00dddcf2 | 2205 | /* Build up entries in the ARGS array, compute the size of the |
2206 | arguments into ARGS_SIZE, etc. */ | |
0e0be288 | 2207 | initialize_argument_information (num_actuals, args, &args_size, |
2208 | n_named_args, actparms, fndecl, | |
2209 | &args_so_far, reg_parm_stack_space, | |
2210 | &old_stack_level, &old_pending_adj, | |
eaa112a0 | 2211 | &must_preallocate, &flags, |
4ee9c684 | 2212 | &try_tail_call, CALL_FROM_THUNK_P (exp)); |
0e0be288 | 2213 | |
2214 | if (args_size.var) | |
2215 | { | |
2216 | /* If this function requires a variable-sized argument list, don't | |
2217 | try to make a cse'able block for this call. We may be able to | |
2218 | do this eventually, but it is too complicated to keep track of | |
1e625a2e | 2219 | what insns go in the cse'able block and which don't. */ |
0e0be288 | 2220 | |
2a0c81bf | 2221 | flags &= ~ECF_LIBCALL_BLOCK; |
0e0be288 | 2222 | must_preallocate = 1; |
2223 | } | |
2224 | ||
2225 | /* Now make final decision about preallocating stack space. */ | |
2226 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2227 | num_actuals, args, | |
2228 | &args_size); | |
2229 | ||
2230 | /* If the structure value address will reference the stack pointer, we | |
2231 | must stabilize it. We don't need to do this if we know that we are | |
2232 | not going to adjust the stack pointer in processing this call. */ | |
2233 | ||
2234 | if (structure_value_addr | |
2235 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2236 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2237 | structure_value_addr)) | |
2238 | && (args_size.var | |
2239 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2240 | structure_value_addr = copy_to_reg (structure_value_addr); | |
60ecc450 | 2241 | |
4f8af819 | 2242 | /* Tail calls can make things harder to debug, and we're traditionally |
2243 | pushed these optimizations into -O2. Don't try if we're already | |
fdf2b689 | 2244 | expanding a call, as that means we're an argument. Don't try if |
2245 | there's cleanups, as we know there's code to follow the call. | |
23f5ea33 | 2246 | |
c87678e4 | 2247 | If rtx_equal_function_value_matters is false, that means we've |
23f5ea33 | 2248 | finished with regular parsing. Which means that some of the |
2249 | machinery we use to generate tail-calls is no longer in place. | |
2250 | This is most often true of sjlj-exceptions, which we couldn't | |
648deeba | 2251 | tail-call to anyway. |
60ecc450 | 2252 | |
648deeba | 2253 | If current_nesting_level () == 0, we're being called after |
2254 | the function body has been expanded. This can happen when | |
2255 | setting up trampolines in expand_function_end. */ | |
0e0be288 | 2256 | if (currently_expanding_call++ != 0 |
2257 | || !flag_optimize_sibling_calls | |
2258 | || !rtx_equal_function_value_matters | |
648deeba | 2259 | || current_nesting_level () == 0 |
4ee9c684 | 2260 | || args_size.var |
2261 | || lookup_stmt_eh_region (exp) >= 0) | |
2262 | try_tail_call = 0; | |
0e0be288 | 2263 | |
2264 | /* Rest of purposes for tail call optimizations to fail. */ | |
2265 | if ( | |
2266 | #ifdef HAVE_sibcall_epilogue | |
2267 | !HAVE_sibcall_epilogue | |
2268 | #else | |
2269 | 1 | |
2270 | #endif | |
2271 | || !try_tail_call | |
2272 | /* Doing sibling call optimization needs some work, since | |
2273 | structure_value_addr can be allocated on the stack. | |
2274 | It does not seem worth the effort since few optimizable | |
2275 | sibling calls will return a structure. */ | |
2276 | || structure_value_addr != NULL_RTX | |
805e22b2 | 2277 | /* Check whether the target is able to optimize the call |
2278 | into a sibcall. */ | |
883b2e73 | 2279 | || !targetm.function_ok_for_sibcall (fndecl, exp) |
805e22b2 | 2280 | /* Functions that do not return exactly once may not be sibcall |
2281 | optimized. */ | |
0d86b7af | 2282 | || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP | ECF_NORETURN)) |
95672afe | 2283 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
4c4a1039 | 2284 | /* If the called function is nested in the current one, it might access |
2285 | some of the caller's arguments, but could clobber them beforehand if | |
2286 | the argument areas are shared. */ | |
2287 | || (fndecl && decl_function_context (fndecl) == current_function_decl) | |
0e0be288 | 2288 | /* If this function requires more stack slots than the current |
2289 | function, we cannot change it into a sibling call. */ | |
2290 | || args_size.constant > current_function_args_size | |
2291 | /* If the callee pops its own arguments, then it must pop exactly | |
2292 | the same number of arguments as the current function. */ | |
e2e9c55b | 2293 | || (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) |
2294 | != RETURN_POPS_ARGS (current_function_decl, | |
2295 | TREE_TYPE (current_function_decl), | |
2296 | current_function_args_size)) | |
dc24ddbd | 2297 | || !lang_hooks.decls.ok_for_sibcall (fndecl)) |
8b1cb18e | 2298 | try_tail_call = 0; |
4b066641 | 2299 | |
4ee9c684 | 2300 | if (try_tail_call) |
0e0be288 | 2301 | { |
2302 | int end, inc; | |
2303 | actparms = NULL_TREE; | |
4f8af819 | 2304 | /* Ok, we're going to give the tail call the old college try. |
2305 | This means we're going to evaluate the function arguments | |
2306 | up to three times. There are two degrees of badness we can | |
2307 | encounter, those that can be unsaved and those that can't. | |
2308 | (See unsafe_for_reeval commentary for details.) | |
2309 | ||
2310 | Generate a new argument list. Pass safe arguments through | |
c87678e4 | 2311 | unchanged. For the easy badness wrap them in UNSAVE_EXPRs. |
4f8af819 | 2312 | For hard badness, evaluate them now and put their resulting |
0e0be288 | 2313 | rtx in a temporary VAR_DECL. |
2314 | ||
2315 | initialize_argument_information has ordered the array for the | |
2316 | order to be pushed, and we must remember this when reconstructing | |
35a3065a | 2317 | the original argument order. */ |
1a038074 | 2318 | |
0e0be288 | 2319 | if (PUSH_ARGS_REVERSED) |
2320 | { | |
2321 | inc = 1; | |
2322 | i = 0; | |
2323 | end = num_actuals; | |
2324 | } | |
2325 | else | |
c87678e4 | 2326 | { |
0e0be288 | 2327 | inc = -1; |
2328 | i = num_actuals - 1; | |
2329 | end = -1; | |
2330 | } | |
2331 | ||
2332 | for (; i != end; i += inc) | |
2333 | { | |
f1eb2fdd | 2334 | args[i].tree_value = fix_unsafe_tree (args[i].tree_value); |
0e0be288 | 2335 | } |
037845e5 | 2336 | /* Do the same for the function address if it is an expression. */ |
f1eb2fdd | 2337 | if (!fndecl) |
95672afe | 2338 | addr = fix_unsafe_tree (addr); |
60ecc450 | 2339 | } |
2340 | ||
60ecc450 | 2341 | |
d0285dd8 | 2342 | /* Ensure current function's preferred stack boundary is at least |
2343 | what we need. We don't have to increase alignment for recursive | |
2344 | functions. */ | |
2345 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2346 | && fndecl != current_function_decl) | |
2347 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
28992b23 | 2348 | if (fndecl == current_function_decl) |
2349 | cfun->recursive_call_emit = true; | |
d0285dd8 | 2350 | |
0e0be288 | 2351 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
4b066641 | 2352 | |
60ecc450 | 2353 | /* We want to make two insn chains; one for a sibling call, the other |
2354 | for a normal call. We will select one of the two chains after | |
2355 | initial RTL generation is complete. */ | |
6e96b626 | 2356 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
60ecc450 | 2357 | { |
2358 | int sibcall_failure = 0; | |
35a3065a | 2359 | /* We want to emit any pending stack adjustments before the tail |
60ecc450 | 2360 | recursion "call". That way we know any adjustment after the tail |
4ee9c684 | 2361 | recursion call can be ignored if we indeed use the tail |
60ecc450 | 2362 | call expansion. */ |
9a5bbcc2 | 2363 | int save_pending_stack_adjust = 0; |
2364 | int save_stack_pointer_delta = 0; | |
60ecc450 | 2365 | rtx insns; |
7a8d641b | 2366 | rtx before_call, next_arg_reg; |
1e2b2ab3 | 2367 | |
60ecc450 | 2368 | if (pass == 0) |
2369 | { | |
99445961 | 2370 | /* Emit any queued insns now; otherwise they would end up in |
2371 | only one of the alternates. */ | |
2372 | emit_queue (); | |
2373 | ||
60ecc450 | 2374 | /* State variables we need to save and restore between |
2375 | iterations. */ | |
2376 | save_pending_stack_adjust = pending_stack_adjust; | |
91b70175 | 2377 | save_stack_pointer_delta = stack_pointer_delta; |
60ecc450 | 2378 | } |
dfe08167 | 2379 | if (pass) |
2380 | flags &= ~ECF_SIBCALL; | |
2381 | else | |
2382 | flags |= ECF_SIBCALL; | |
66d433c7 | 2383 | |
60ecc450 | 2384 | /* Other state variables that we must reinitialize each time |
dfe08167 | 2385 | through the loop (that are not initialized by the loop itself). */ |
60ecc450 | 2386 | argblock = 0; |
2387 | call_fusage = 0; | |
2f921ec9 | 2388 | |
c87678e4 | 2389 | /* Start a new sequence for the normal call case. |
66d433c7 | 2390 | |
60ecc450 | 2391 | From this point on, if the sibling call fails, we want to set |
2392 | sibcall_failure instead of continuing the loop. */ | |
2393 | start_sequence (); | |
412321ce | 2394 | |
9dd2e268 | 2395 | if (pass == 0) |
2396 | { | |
2397 | /* We know at this point that there are not currently any | |
2398 | pending cleanups. If, however, in the process of evaluating | |
2399 | the arguments we were to create some, we'll need to be | |
2400 | able to get rid of them. */ | |
2401 | expand_start_target_temps (); | |
2402 | } | |
2403 | ||
60ecc450 | 2404 | /* Don't let pending stack adjusts add up to too much. |
2405 | Also, do all pending adjustments now if there is any chance | |
2406 | this might be a call to alloca or if we are expanding a sibling | |
5edaabad | 2407 | call sequence or if we are calling a function that is to return |
2408 | with stack pointer depressed. */ | |
60ecc450 | 2409 | if (pending_stack_adjust >= 32 |
5edaabad | 2410 | || (pending_stack_adjust > 0 |
2411 | && (flags & (ECF_MAY_BE_ALLOCA | ECF_SP_DEPRESSED))) | |
60ecc450 | 2412 | || pass == 0) |
2413 | do_pending_stack_adjust (); | |
66d433c7 | 2414 | |
544c4b41 | 2415 | /* When calling a const function, we must pop the stack args right away, |
2416 | so that the pop is deleted or moved with the call. */ | |
2a0c81bf | 2417 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
544c4b41 | 2418 | NO_DEFER_POP; |
2419 | ||
60ecc450 | 2420 | /* Precompute any arguments as needed. */ |
02510658 | 2421 | if (pass) |
2422 | precompute_arguments (flags, num_actuals, args); | |
66d433c7 | 2423 | |
60ecc450 | 2424 | /* Now we are about to start emitting insns that can be deleted |
2425 | if a libcall is deleted. */ | |
2a0c81bf | 2426 | if (pass && (flags & (ECF_LIBCALL_BLOCK | ECF_MALLOC))) |
60ecc450 | 2427 | start_sequence (); |
66d433c7 | 2428 | |
0e0be288 | 2429 | adjusted_args_size = args_size; |
481feae3 | 2430 | /* Compute the actual size of the argument block required. The variable |
2431 | and constant sizes must be combined, the size may have to be rounded, | |
2432 | and there may be a minimum required size. When generating a sibcall | |
2433 | pattern, do not round up, since we'll be re-using whatever space our | |
2434 | caller provided. */ | |
2435 | unadjusted_args_size | |
c87678e4 | 2436 | = compute_argument_block_size (reg_parm_stack_space, |
2437 | &adjusted_args_size, | |
481feae3 | 2438 | (pass == 0 ? 0 |
2439 | : preferred_stack_boundary)); | |
2440 | ||
c87678e4 | 2441 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
481feae3 | 2442 | |
02510658 | 2443 | /* The argument block when performing a sibling call is the |
2444 | incoming argument block. */ | |
2445 | if (pass == 0) | |
7ecc63d3 | 2446 | { |
2447 | argblock = virtual_incoming_args_rtx; | |
bd54bbc6 | 2448 | argblock |
2449 | #ifdef STACK_GROWS_DOWNWARD | |
2450 | = plus_constant (argblock, current_function_pretend_args_size); | |
2451 | #else | |
2452 | = plus_constant (argblock, -current_function_pretend_args_size); | |
2453 | #endif | |
7ecc63d3 | 2454 | stored_args_map = sbitmap_alloc (args_size.constant); |
2455 | sbitmap_zero (stored_args_map); | |
2456 | } | |
481feae3 | 2457 | |
60ecc450 | 2458 | /* If we have no actual push instructions, or shouldn't use them, |
2459 | make space for all args right now. */ | |
0e0be288 | 2460 | else if (adjusted_args_size.var != 0) |
66d433c7 | 2461 | { |
60ecc450 | 2462 | if (old_stack_level == 0) |
2463 | { | |
2464 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
9069face | 2465 | old_stack_pointer_delta = stack_pointer_delta; |
60ecc450 | 2466 | old_pending_adj = pending_stack_adjust; |
2467 | pending_stack_adjust = 0; | |
60ecc450 | 2468 | /* stack_arg_under_construction says whether a stack arg is |
2469 | being constructed at the old stack level. Pushing the stack | |
2470 | gets a clean outgoing argument block. */ | |
2471 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2472 | stack_arg_under_construction = 0; | |
60ecc450 | 2473 | } |
0e0be288 | 2474 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
66d433c7 | 2475 | } |
60ecc450 | 2476 | else |
2477 | { | |
2478 | /* Note that we must go through the motions of allocating an argument | |
2479 | block even if the size is zero because we may be storing args | |
2480 | in the area reserved for register arguments, which may be part of | |
2481 | the stack frame. */ | |
7221f864 | 2482 | |
0e0be288 | 2483 | int needed = adjusted_args_size.constant; |
66d433c7 | 2484 | |
60ecc450 | 2485 | /* Store the maximum argument space used. It will be pushed by |
2486 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2487 | checking). */ | |
66d433c7 | 2488 | |
60ecc450 | 2489 | if (needed > current_function_outgoing_args_size) |
2490 | current_function_outgoing_args_size = needed; | |
66d433c7 | 2491 | |
60ecc450 | 2492 | if (must_preallocate) |
2493 | { | |
4448f543 | 2494 | if (ACCUMULATE_OUTGOING_ARGS) |
2495 | { | |
02510658 | 2496 | /* Since the stack pointer will never be pushed, it is |
2497 | possible for the evaluation of a parm to clobber | |
2498 | something we have already written to the stack. | |
2499 | Since most function calls on RISC machines do not use | |
2500 | the stack, this is uncommon, but must work correctly. | |
7221f864 | 2501 | |
4448f543 | 2502 | Therefore, we save any area of the stack that was already |
02510658 | 2503 | written and that we are using. Here we set up to do this |
2504 | by making a new stack usage map from the old one. The | |
c87678e4 | 2505 | actual save will be done by store_one_arg. |
7221f864 | 2506 | |
4448f543 | 2507 | Another approach might be to try to reorder the argument |
2508 | evaluations to avoid this conflicting stack usage. */ | |
7221f864 | 2509 | |
997d68fe | 2510 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
02510658 | 2511 | /* Since we will be writing into the entire argument area, |
2512 | the map must be allocated for its entire size, not just | |
2513 | the part that is the responsibility of the caller. */ | |
4448f543 | 2514 | needed += reg_parm_stack_space; |
66d433c7 | 2515 | #endif |
2516 | ||
2517 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 2518 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2519 | needed + 1); | |
66d433c7 | 2520 | #else |
4448f543 | 2521 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2522 | needed); | |
66d433c7 | 2523 | #endif |
f0af5a88 | 2524 | stack_usage_map = alloca (highest_outgoing_arg_in_use); |
66d433c7 | 2525 | |
4448f543 | 2526 | if (initial_highest_arg_in_use) |
8e547276 | 2527 | memcpy (stack_usage_map, initial_stack_usage_map, |
2528 | initial_highest_arg_in_use); | |
d1b03b62 | 2529 | |
4448f543 | 2530 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
93d3b7de | 2531 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
4448f543 | 2532 | (highest_outgoing_arg_in_use |
2533 | - initial_highest_arg_in_use)); | |
2534 | needed = 0; | |
d1b03b62 | 2535 | |
02510658 | 2536 | /* The address of the outgoing argument list must not be |
2537 | copied to a register here, because argblock would be left | |
2538 | pointing to the wrong place after the call to | |
c87678e4 | 2539 | allocate_dynamic_stack_space below. */ |
d1b03b62 | 2540 | |
4448f543 | 2541 | argblock = virtual_outgoing_args_rtx; |
c87678e4 | 2542 | } |
4448f543 | 2543 | else |
7221f864 | 2544 | { |
4448f543 | 2545 | if (inhibit_defer_pop == 0) |
60ecc450 | 2546 | { |
4448f543 | 2547 | /* Try to reuse some or all of the pending_stack_adjust |
481feae3 | 2548 | to get this space. */ |
2549 | needed | |
c87678e4 | 2550 | = (combine_pending_stack_adjustment_and_call |
481feae3 | 2551 | (unadjusted_args_size, |
0e0be288 | 2552 | &adjusted_args_size, |
481feae3 | 2553 | preferred_unit_stack_boundary)); |
2554 | ||
2555 | /* combine_pending_stack_adjustment_and_call computes | |
2556 | an adjustment before the arguments are allocated. | |
2557 | Account for them and see whether or not the stack | |
2558 | needs to go up or down. */ | |
2559 | needed = unadjusted_args_size - needed; | |
2560 | ||
2561 | if (needed < 0) | |
4448f543 | 2562 | { |
481feae3 | 2563 | /* We're releasing stack space. */ |
2564 | /* ??? We can avoid any adjustment at all if we're | |
2565 | already aligned. FIXME. */ | |
2566 | pending_stack_adjust = -needed; | |
2567 | do_pending_stack_adjust (); | |
4448f543 | 2568 | needed = 0; |
2569 | } | |
c87678e4 | 2570 | else |
481feae3 | 2571 | /* We need to allocate space. We'll do that in |
2572 | push_block below. */ | |
2573 | pending_stack_adjust = 0; | |
60ecc450 | 2574 | } |
481feae3 | 2575 | |
2576 | /* Special case this because overhead of `push_block' in | |
2577 | this case is non-trivial. */ | |
4448f543 | 2578 | if (needed == 0) |
2579 | argblock = virtual_outgoing_args_rtx; | |
60ecc450 | 2580 | else |
ad3b56f3 | 2581 | { |
2582 | argblock = push_block (GEN_INT (needed), 0, 0); | |
2583 | #ifdef ARGS_GROW_DOWNWARD | |
2584 | argblock = plus_constant (argblock, needed); | |
2585 | #endif | |
2586 | } | |
4448f543 | 2587 | |
02510658 | 2588 | /* We only really need to call `copy_to_reg' in the case |
2589 | where push insns are going to be used to pass ARGBLOCK | |
2590 | to a function call in ARGS. In that case, the stack | |
2591 | pointer changes value from the allocation point to the | |
2592 | call point, and hence the value of | |
2593 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2594 | as well always do it. */ | |
4448f543 | 2595 | argblock = copy_to_reg (argblock); |
9069face | 2596 | } |
2597 | } | |
2598 | } | |
60ecc450 | 2599 | |
9069face | 2600 | if (ACCUMULATE_OUTGOING_ARGS) |
2601 | { | |
2602 | /* The save/restore code in store_one_arg handles all | |
2603 | cases except one: a constructor call (including a C | |
2604 | function returning a BLKmode struct) to initialize | |
2605 | an argument. */ | |
2606 | if (stack_arg_under_construction) | |
2607 | { | |
997d68fe | 2608 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
9069face | 2609 | rtx push_size = GEN_INT (reg_parm_stack_space |
2610 | + adjusted_args_size.constant); | |
a3585b90 | 2611 | #else |
9069face | 2612 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
a3585b90 | 2613 | #endif |
9069face | 2614 | if (old_stack_level == 0) |
2615 | { | |
2616 | emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2617 | NULL_RTX); | |
2618 | old_stack_pointer_delta = stack_pointer_delta; | |
2619 | old_pending_adj = pending_stack_adjust; | |
2620 | pending_stack_adjust = 0; | |
2621 | /* stack_arg_under_construction says whether a stack | |
2622 | arg is being constructed at the old stack level. | |
2623 | Pushing the stack gets a clean outgoing argument | |
2624 | block. */ | |
2625 | old_stack_arg_under_construction | |
2626 | = stack_arg_under_construction; | |
2627 | stack_arg_under_construction = 0; | |
2628 | /* Make a new map for the new argument list. */ | |
f0af5a88 | 2629 | stack_usage_map = alloca (highest_outgoing_arg_in_use); |
9069face | 2630 | memset (stack_usage_map, 0, highest_outgoing_arg_in_use); |
2631 | highest_outgoing_arg_in_use = 0; | |
4448f543 | 2632 | } |
9069face | 2633 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2634 | BITS_PER_UNIT); | |
60ecc450 | 2635 | } |
a3585b90 | 2636 | |
9069face | 2637 | /* If argument evaluation might modify the stack pointer, |
2638 | copy the address of the argument list to a register. */ | |
2639 | for (i = 0; i < num_actuals; i++) | |
2640 | if (args[i].pass_on_stack) | |
2641 | { | |
2642 | argblock = copy_addr_to_reg (argblock); | |
2643 | break; | |
2644 | } | |
2645 | } | |
4c9e08a4 | 2646 | |
60ecc450 | 2647 | compute_argument_addresses (args, argblock, num_actuals); |
a3585b90 | 2648 | |
60ecc450 | 2649 | /* If we push args individually in reverse order, perform stack alignment |
2650 | before the first push (the last arg). */ | |
4448f543 | 2651 | if (PUSH_ARGS_REVERSED && argblock == 0 |
0e0be288 | 2652 | && adjusted_args_size.constant != unadjusted_args_size) |
ff92623c | 2653 | { |
60ecc450 | 2654 | /* When the stack adjustment is pending, we get better code |
2655 | by combining the adjustments. */ | |
c87678e4 | 2656 | if (pending_stack_adjust |
2a0c81bf | 2657 | && ! (flags & ECF_LIBCALL_BLOCK) |
60ecc450 | 2658 | && ! inhibit_defer_pop) |
481feae3 | 2659 | { |
2660 | pending_stack_adjust | |
c87678e4 | 2661 | = (combine_pending_stack_adjustment_and_call |
481feae3 | 2662 | (unadjusted_args_size, |
0e0be288 | 2663 | &adjusted_args_size, |
481feae3 | 2664 | preferred_unit_stack_boundary)); |
2665 | do_pending_stack_adjust (); | |
2666 | } | |
60ecc450 | 2667 | else if (argblock == 0) |
0e0be288 | 2668 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
60ecc450 | 2669 | - unadjusted_args_size)); |
60ecc450 | 2670 | } |
fa4f1f09 | 2671 | /* Now that the stack is properly aligned, pops can't safely |
2672 | be deferred during the evaluation of the arguments. */ | |
2673 | NO_DEFER_POP; | |
66d433c7 | 2674 | |
95672afe | 2675 | funexp = rtx_for_function_call (fndecl, addr); |
66d433c7 | 2676 | |
60ecc450 | 2677 | /* Figure out the register where the value, if any, will come back. */ |
2678 | valreg = 0; | |
2679 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2680 | && ! structure_value_addr) | |
2681 | { | |
2682 | if (pcc_struct_value) | |
2683 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
7a8d641b | 2684 | fndecl, (pass == 0)); |
60ecc450 | 2685 | else |
7a8d641b | 2686 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0)); |
60ecc450 | 2687 | } |
66d433c7 | 2688 | |
60ecc450 | 2689 | /* Precompute all register parameters. It isn't safe to compute anything |
2690 | once we have started filling any specific hard regs. */ | |
2691 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
66d433c7 | 2692 | |
4ee9c684 | 2693 | if (TREE_OPERAND (exp, 2)) |
2694 | static_chain_value = expand_expr (TREE_OPERAND (exp, 2), | |
2695 | NULL_RTX, VOIDmode, 0); | |
2696 | else | |
2697 | static_chain_value = 0; | |
2698 | ||
4448f543 | 2699 | #ifdef REG_PARM_STACK_SPACE |
60ecc450 | 2700 | /* Save the fixed argument area if it's part of the caller's frame and |
2701 | is clobbered by argument setup for this call. */ | |
02510658 | 2702 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
4448f543 | 2703 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2704 | &low_to_save, &high_to_save); | |
41332f48 | 2705 | #endif |
66d433c7 | 2706 | |
60ecc450 | 2707 | /* Now store (and compute if necessary) all non-register parms. |
2708 | These come before register parms, since they can require block-moves, | |
2709 | which could clobber the registers used for register parms. | |
2710 | Parms which have partial registers are not stored here, | |
2711 | but we do preallocate space here if they want that. */ | |
66d433c7 | 2712 | |
60ecc450 | 2713 | for (i = 0; i < num_actuals; i++) |
2714 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
7ecc63d3 | 2715 | { |
2716 | rtx before_arg = get_last_insn (); | |
2717 | ||
57679d39 | 2718 | if (store_one_arg (&args[i], argblock, flags, |
2719 | adjusted_args_size.var != 0, | |
2720 | reg_parm_stack_space) | |
2721 | || (pass == 0 | |
2722 | && check_sibcall_argument_overlap (before_arg, | |
42b11544 | 2723 | &args[i], 1))) |
7ecc63d3 | 2724 | sibcall_failure = 1; |
8697e217 | 2725 | |
2726 | if (flags & ECF_CONST | |
2727 | && args[i].stack | |
2728 | && args[i].value == args[i].stack) | |
2729 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
2730 | gen_rtx_USE (VOIDmode, | |
2731 | args[i].value), | |
2732 | call_fusage); | |
7ecc63d3 | 2733 | } |
60ecc450 | 2734 | |
2735 | /* If we have a parm that is passed in registers but not in memory | |
2736 | and whose alignment does not permit a direct copy into registers, | |
2737 | make a group of pseudos that correspond to each register that we | |
2738 | will later fill. */ | |
2739 | if (STRICT_ALIGNMENT) | |
2740 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2741 | ||
2742 | /* Now store any partially-in-registers parm. | |
2743 | This is the last place a block-move can happen. */ | |
2744 | if (reg_parm_seen) | |
2745 | for (i = 0; i < num_actuals; i++) | |
2746 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
7ecc63d3 | 2747 | { |
2748 | rtx before_arg = get_last_insn (); | |
2749 | ||
57679d39 | 2750 | if (store_one_arg (&args[i], argblock, flags, |
2751 | adjusted_args_size.var != 0, | |
2752 | reg_parm_stack_space) | |
2753 | || (pass == 0 | |
2754 | && check_sibcall_argument_overlap (before_arg, | |
42b11544 | 2755 | &args[i], 1))) |
7ecc63d3 | 2756 | sibcall_failure = 1; |
2757 | } | |
66d433c7 | 2758 | |
60ecc450 | 2759 | /* If we pushed args in forward order, perform stack alignment |
2760 | after pushing the last arg. */ | |
4448f543 | 2761 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
0e0be288 | 2762 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
60ecc450 | 2763 | - unadjusted_args_size)); |
66d433c7 | 2764 | |
60ecc450 | 2765 | /* If register arguments require space on the stack and stack space |
2766 | was not preallocated, allocate stack space here for arguments | |
2767 | passed in registers. */ | |
4448f543 | 2768 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
2769 | if (!ACCUMULATE_OUTGOING_ARGS | |
c87678e4 | 2770 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
60ecc450 | 2771 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
985adbca | 2772 | #endif |
2773 | ||
60ecc450 | 2774 | /* Pass the function the address in which to return a |
2775 | structure value. */ | |
2776 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
2777 | { | |
85d654dd | 2778 | structure_value_addr |
2779 | = convert_memory_address (Pmode, structure_value_addr); | |
45550790 | 2780 | emit_move_insn (struct_value, |
60ecc450 | 2781 | force_reg (Pmode, |
2782 | force_operand (structure_value_addr, | |
2783 | NULL_RTX))); | |
2784 | ||
8ad4c111 | 2785 | if (REG_P (struct_value)) |
45550790 | 2786 | use_reg (&call_fusage, struct_value); |
60ecc450 | 2787 | } |
02c736f4 | 2788 | |
4ee9c684 | 2789 | funexp = prepare_call_address (funexp, static_chain_value, |
2790 | &call_fusage, reg_parm_seen, pass == 0); | |
66d433c7 | 2791 | |
42b11544 | 2792 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
2793 | pass == 0, &sibcall_failure); | |
c87678e4 | 2794 | |
60ecc450 | 2795 | /* Perform postincrements before actually calling the function. */ |
2796 | emit_queue (); | |
66d433c7 | 2797 | |
60ecc450 | 2798 | /* Save a pointer to the last insn before the call, so that we can |
2799 | later safely search backwards to find the CALL_INSN. */ | |
2800 | before_call = get_last_insn (); | |
66d433c7 | 2801 | |
7a8d641b | 2802 | /* Set up next argument register. For sibling calls on machines |
2803 | with register windows this should be the incoming register. */ | |
2804 | #ifdef FUNCTION_INCOMING_ARG | |
2805 | if (pass == 0) | |
2806 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
2807 | void_type_node, 1); | |
2808 | else | |
2809 | #endif | |
2810 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
2811 | void_type_node, 1); | |
2812 | ||
60ecc450 | 2813 | /* All arguments and registers used for the call must be set up by |
2814 | now! */ | |
2815 | ||
481feae3 | 2816 | /* Stack must be properly aligned now. */ |
2817 | if (pass && stack_pointer_delta % preferred_unit_stack_boundary) | |
01bfa89e | 2818 | abort (); |
fa4f1f09 | 2819 | |
60ecc450 | 2820 | /* Generate the actual call instruction. */ |
4ee9c684 | 2821 | emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, |
0e0be288 | 2822 | adjusted_args_size.constant, struct_value_size, |
7a8d641b | 2823 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
87e19636 | 2824 | flags, & args_so_far); |
60ecc450 | 2825 | |
2826 | /* If call is cse'able, make appropriate pair of reg-notes around it. | |
2827 | Test valreg so we don't crash; may safely ignore `const' | |
2828 | if return type is void. Disable for PARALLEL return values, because | |
2829 | we have no way to move such values into a pseudo register. */ | |
2a0c81bf | 2830 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
ea0cb7ae | 2831 | { |
60ecc450 | 2832 | rtx insns; |
f9c6a9c3 | 2833 | rtx insn; |
2834 | bool failed = valreg == 0 || GET_CODE (valreg) == PARALLEL; | |
ea0cb7ae | 2835 | |
f9c6a9c3 | 2836 | insns = get_insns (); |
2837 | ||
2838 | /* Expansion of block moves possibly introduced a loop that may | |
2839 | not appear inside libcall block. */ | |
2840 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
6d7dc5b9 | 2841 | if (JUMP_P (insn)) |
f9c6a9c3 | 2842 | failed = true; |
2843 | ||
2844 | if (failed) | |
6e17d606 | 2845 | { |
6e17d606 | 2846 | end_sequence (); |
31d3e01c | 2847 | emit_insn (insns); |
6e17d606 | 2848 | } |
2849 | else | |
2850 | { | |
2851 | rtx note = 0; | |
2852 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2853 | ||
2854 | /* Mark the return value as a pointer if needed. */ | |
2855 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
2856 | mark_reg_pointer (temp, | |
2857 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); | |
2858 | ||
6e17d606 | 2859 | end_sequence (); |
9a82df26 | 2860 | if (flag_unsafe_math_optimizations |
2861 | && fndecl | |
2862 | && DECL_BUILT_IN (fndecl) | |
2863 | && (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRT | |
2864 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTF | |
2865 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTL)) | |
2866 | note = gen_rtx_fmt_e (SQRT, | |
2867 | GET_MODE (temp), | |
2868 | args[0].initial_value); | |
2869 | else | |
2870 | { | |
2871 | /* Construct an "equal form" for the value which | |
2872 | mentions all the arguments in order as well as | |
2873 | the function name. */ | |
2874 | for (i = 0; i < num_actuals; i++) | |
2875 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
2876 | args[i].initial_value, note); | |
2877 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); | |
2878 | ||
2879 | if (flags & ECF_PURE) | |
2880 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
6e17d606 | 2881 | gen_rtx_USE (VOIDmode, |
2882 | gen_rtx_MEM (BLKmode, | |
2883 | gen_rtx_SCRATCH (VOIDmode))), | |
2884 | note); | |
9a82df26 | 2885 | } |
6e17d606 | 2886 | emit_libcall_block (insns, temp, valreg, note); |
2887 | ||
2888 | valreg = temp; | |
2889 | } | |
60ecc450 | 2890 | } |
2a0c81bf | 2891 | else if (pass && (flags & ECF_MALLOC)) |
60ecc450 | 2892 | { |
2893 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2894 | rtx last, insns; | |
2895 | ||
c87678e4 | 2896 | /* The return value from a malloc-like function is a pointer. */ |
60ecc450 | 2897 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
80909c64 | 2898 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
60ecc450 | 2899 | |
2900 | emit_move_insn (temp, valreg); | |
2901 | ||
2902 | /* The return value from a malloc-like function can not alias | |
2903 | anything else. */ | |
2904 | last = get_last_insn (); | |
c87678e4 | 2905 | REG_NOTES (last) = |
60ecc450 | 2906 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); |
2907 | ||
2908 | /* Write out the sequence. */ | |
2909 | insns = get_insns (); | |
2910 | end_sequence (); | |
31d3e01c | 2911 | emit_insn (insns); |
60ecc450 | 2912 | valreg = temp; |
2913 | } | |
66d433c7 | 2914 | |
60ecc450 | 2915 | /* For calls to `setjmp', etc., inform flow.c it should complain |
2916 | if nonvolatile values are live. For functions that cannot return, | |
2917 | inform flow that control does not fall through. */ | |
66d433c7 | 2918 | |
9239aee6 | 2919 | if ((flags & (ECF_NORETURN | ECF_LONGJMP)) || pass == 0) |
02c736f4 | 2920 | { |
9239aee6 | 2921 | /* The barrier must be emitted |
60ecc450 | 2922 | immediately after the CALL_INSN. Some ports emit more |
2923 | than just a CALL_INSN above, so we must search for it here. */ | |
66d433c7 | 2924 | |
60ecc450 | 2925 | rtx last = get_last_insn (); |
6d7dc5b9 | 2926 | while (!CALL_P (last)) |
60ecc450 | 2927 | { |
2928 | last = PREV_INSN (last); | |
2929 | /* There was no CALL_INSN? */ | |
2930 | if (last == before_call) | |
2931 | abort (); | |
2932 | } | |
66d433c7 | 2933 | |
9239aee6 | 2934 | emit_barrier_after (last); |
20f5f6d0 | 2935 | |
b494d193 | 2936 | /* Stack adjustments after a noreturn call are dead code. |
2937 | However when NO_DEFER_POP is in effect, we must preserve | |
2938 | stack_pointer_delta. */ | |
2939 | if (inhibit_defer_pop == 0) | |
2940 | { | |
2941 | stack_pointer_delta = old_stack_allocated; | |
2942 | pending_stack_adjust = 0; | |
2943 | } | |
60ecc450 | 2944 | } |
66d433c7 | 2945 | |
dfe08167 | 2946 | if (flags & ECF_LONGJMP) |
0e0be288 | 2947 | current_function_calls_longjmp = 1; |
66d433c7 | 2948 | |
60ecc450 | 2949 | /* If value type not void, return an rtx for the value. */ |
66d433c7 | 2950 | |
60ecc450 | 2951 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
2952 | || ignore) | |
5edaabad | 2953 | target = const0_rtx; |
60ecc450 | 2954 | else if (structure_value_addr) |
2955 | { | |
e16ceb8e | 2956 | if (target == 0 || !MEM_P (target)) |
60ecc450 | 2957 | { |
f7c44134 | 2958 | target |
2959 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2960 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
2961 | structure_value_addr)); | |
2962 | set_mem_attributes (target, exp, 1); | |
60ecc450 | 2963 | } |
2964 | } | |
2965 | else if (pcc_struct_value) | |
566d850a | 2966 | { |
60ecc450 | 2967 | /* This is the special C++ case where we need to |
2968 | know what the true target was. We take care to | |
2969 | never use this value more than once in one expression. */ | |
2970 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2971 | copy_to_reg (valreg)); | |
f7c44134 | 2972 | set_mem_attributes (target, exp, 1); |
566d850a | 2973 | } |
60ecc450 | 2974 | /* Handle calls that return values in multiple non-contiguous locations. |
2975 | The Irix 6 ABI has examples of this. */ | |
2976 | else if (GET_CODE (valreg) == PARALLEL) | |
2977 | { | |
4ee9c684 | 2978 | if (target == 0) |
60ecc450 | 2979 | { |
387bc205 | 2980 | /* This will only be assigned once, so it can be readonly. */ |
2981 | tree nt = build_qualified_type (TREE_TYPE (exp), | |
2982 | (TYPE_QUALS (TREE_TYPE (exp)) | |
2983 | | TYPE_QUAL_CONST)); | |
2984 | ||
2985 | target = assign_temp (nt, 0, 1, 1); | |
60ecc450 | 2986 | preserve_temp_slots (target); |
2987 | } | |
2988 | ||
2989 | if (! rtx_equal_p (target, valreg)) | |
5f4cd670 | 2990 | emit_group_store (target, valreg, TREE_TYPE (exp), |
2c269e73 | 2991 | int_size_in_bytes (TREE_TYPE (exp))); |
325d1c45 | 2992 | |
60ecc450 | 2993 | /* We can not support sibling calls for this case. */ |
2994 | sibcall_failure = 1; | |
2995 | } | |
2996 | else if (target | |
2997 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
2998 | && GET_MODE (target) == GET_MODE (valreg)) | |
2999 | { | |
3000 | /* TARGET and VALREG cannot be equal at this point because the | |
3001 | latter would not have REG_FUNCTION_VALUE_P true, while the | |
3002 | former would if it were referring to the same register. | |
3003 | ||
3004 | If they refer to the same register, this move will be a no-op, | |
3005 | except when function inlining is being done. */ | |
3006 | emit_move_insn (target, valreg); | |
dbe1f550 | 3007 | |
3008 | /* If we are setting a MEM, this code must be executed. Since it is | |
3009 | emitted after the call insn, sibcall optimization cannot be | |
3010 | performed in that case. */ | |
e16ceb8e | 3011 | if (MEM_P (target)) |
dbe1f550 | 3012 | sibcall_failure = 1; |
60ecc450 | 3013 | } |
3014 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
044aa5ed | 3015 | { |
3016 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3017 | ||
3018 | /* We can not support sibling calls for this case. */ | |
3019 | sibcall_failure = 1; | |
3020 | } | |
60ecc450 | 3021 | else |
2c8ff1ed | 3022 | { |
3023 | if (shift_returned_value (TREE_TYPE (exp), &valreg)) | |
3024 | sibcall_failure = 1; | |
3025 | ||
3026 | target = copy_to_reg (valreg); | |
3027 | } | |
66d433c7 | 3028 | |
45550790 | 3029 | if (targetm.calls.promote_function_return(funtype)) |
3030 | { | |
60ecc450 | 3031 | /* If we promoted this return value, make the proper SUBREG. TARGET |
3032 | might be const0_rtx here, so be careful. */ | |
8ad4c111 | 3033 | if (REG_P (target) |
60ecc450 | 3034 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode |
3035 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3036 | { | |
3037 | tree type = TREE_TYPE (exp); | |
78a8ed03 | 3038 | int unsignedp = TYPE_UNSIGNED (type); |
701e46d0 | 3039 | int offset = 0; |
23eb5fa6 | 3040 | |
60ecc450 | 3041 | /* If we don't promote as expected, something is wrong. */ |
3042 | if (GET_MODE (target) | |
3043 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
3044 | abort (); | |
199bbafe | 3045 | |
701e46d0 | 3046 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) |
3047 | && GET_MODE_SIZE (GET_MODE (target)) | |
3048 | > GET_MODE_SIZE (TYPE_MODE (type))) | |
3049 | { | |
3050 | offset = GET_MODE_SIZE (GET_MODE (target)) | |
3051 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3052 | if (! BYTES_BIG_ENDIAN) | |
3053 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3054 | else if (! WORDS_BIG_ENDIAN) | |
3055 | offset %= UNITS_PER_WORD; | |
3056 | } | |
3057 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
60ecc450 | 3058 | SUBREG_PROMOTED_VAR_P (target) = 1; |
bfd242e8 | 3059 | SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); |
60ecc450 | 3060 | } |
45550790 | 3061 | } |
23eb5fa6 | 3062 | |
60ecc450 | 3063 | /* If size of args is variable or this was a constructor call for a stack |
3064 | argument, restore saved stack-pointer value. */ | |
66d433c7 | 3065 | |
d490e2f2 | 3066 | if (old_stack_level && ! (flags & ECF_SP_DEPRESSED)) |
60ecc450 | 3067 | { |
3068 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
9069face | 3069 | stack_pointer_delta = old_stack_pointer_delta; |
60ecc450 | 3070 | pending_stack_adjust = old_pending_adj; |
60ecc450 | 3071 | stack_arg_under_construction = old_stack_arg_under_construction; |
3072 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3073 | stack_usage_map = initial_stack_usage_map; | |
60ecc450 | 3074 | sibcall_failure = 1; |
3075 | } | |
02510658 | 3076 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
60ecc450 | 3077 | { |
66d433c7 | 3078 | #ifdef REG_PARM_STACK_SPACE |
60ecc450 | 3079 | if (save_area) |
6e96b626 | 3080 | restore_fixed_argument_area (save_area, argblock, |
3081 | high_to_save, low_to_save); | |
41332f48 | 3082 | #endif |
66d433c7 | 3083 | |
60ecc450 | 3084 | /* If we saved any argument areas, restore them. */ |
3085 | for (i = 0; i < num_actuals; i++) | |
3086 | if (args[i].save_area) | |
3087 | { | |
3088 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3089 | rtx stack_area | |
3090 | = gen_rtx_MEM (save_mode, | |
3091 | memory_address (save_mode, | |
3092 | XEXP (args[i].stack_slot, 0))); | |
3093 | ||
3094 | if (save_mode != BLKmode) | |
3095 | emit_move_insn (stack_area, args[i].save_area); | |
3096 | else | |
0378dbdc | 3097 | emit_block_move (stack_area, args[i].save_area, |
241399f6 | 3098 | GEN_INT (args[i].locate.size.constant), |
0378dbdc | 3099 | BLOCK_OP_CALL_PARM); |
60ecc450 | 3100 | } |
66d433c7 | 3101 | |
60ecc450 | 3102 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3103 | stack_usage_map = initial_stack_usage_map; | |
3104 | } | |
66d433c7 | 3105 | |
c87678e4 | 3106 | /* If this was alloca, record the new stack level for nonlocal gotos. |
60ecc450 | 3107 | Check for the handler slots since we might not have a save area |
3108 | for non-local gotos. */ | |
dbd6697a | 3109 | |
4ee9c684 | 3110 | if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) |
3111 | update_nonlocal_goto_save_area (); | |
66d433c7 | 3112 | |
60ecc450 | 3113 | /* Free up storage we no longer need. */ |
3114 | for (i = 0; i < num_actuals; ++i) | |
3115 | if (args[i].aligned_regs) | |
3116 | free (args[i].aligned_regs); | |
3117 | ||
c931f2f0 | 3118 | if (pass == 0) |
3119 | { | |
3120 | /* Undo the fake expand_start_target_temps we did earlier. If | |
3121 | there had been any cleanups created, we've already set | |
3122 | sibcall_failure. */ | |
3123 | expand_end_target_temps (); | |
3124 | } | |
3125 | ||
d5f9786f | 3126 | /* If this function is returning into a memory location marked as |
3127 | readonly, it means it is initializing that location. We normally treat | |
3128 | functions as not clobbering such locations, so we need to specify that | |
3129 | this one does. We do this by adding the appropriate CLOBBER to the | |
3130 | CALL_INSN function usage list. This cannot be done by emitting a | |
3131 | standalone CLOBBER after the call because the latter would be ignored | |
3132 | by at least the delay slot scheduling pass. We do this now instead of | |
3133 | adding to call_fusage before the call to emit_call_1 because TARGET | |
3134 | may be modified in the meantime. */ | |
4c9e08a4 | 3135 | if (structure_value_addr != 0 && target != 0 |
e16ceb8e | 3136 | && MEM_P (target) && RTX_UNCHANGING_P (target)) |
d5f9786f | 3137 | add_function_usage_to |
3138 | (last_call_insn (), | |
3139 | gen_rtx_EXPR_LIST (VOIDmode, gen_rtx_CLOBBER (VOIDmode, target), | |
3140 | NULL_RTX)); | |
4c9e08a4 | 3141 | |
60ecc450 | 3142 | insns = get_insns (); |
3143 | end_sequence (); | |
3144 | ||
3145 | if (pass == 0) | |
3146 | { | |
3147 | tail_call_insns = insns; | |
3148 | ||
60ecc450 | 3149 | /* Restore the pending stack adjustment now that we have |
3150 | finished generating the sibling call sequence. */ | |
91b70175 | 3151 | |
60ecc450 | 3152 | pending_stack_adjust = save_pending_stack_adjust; |
91b70175 | 3153 | stack_pointer_delta = save_stack_pointer_delta; |
0e0be288 | 3154 | |
3155 | /* Prepare arg structure for next iteration. */ | |
c87678e4 | 3156 | for (i = 0; i < num_actuals; i++) |
0e0be288 | 3157 | { |
3158 | args[i].value = 0; | |
3159 | args[i].aligned_regs = 0; | |
3160 | args[i].stack = 0; | |
3161 | } | |
7ecc63d3 | 3162 | |
3163 | sbitmap_free (stored_args_map); | |
60ecc450 | 3164 | } |
3165 | else | |
9069face | 3166 | { |
3167 | normal_call_insns = insns; | |
3168 | ||
3169 | /* Verify that we've deallocated all the stack we used. */ | |
20f5f6d0 | 3170 | if (! (flags & (ECF_NORETURN | ECF_LONGJMP)) |
3171 | && old_stack_allocated != stack_pointer_delta | |
3172 | - pending_stack_adjust) | |
9069face | 3173 | abort (); |
3174 | } | |
ae8d6151 | 3175 | |
3176 | /* If something prevents making this a sibling call, | |
3177 | zero out the sequence. */ | |
3178 | if (sibcall_failure) | |
3179 | tail_call_insns = NULL_RTX; | |
4ee9c684 | 3180 | else |
3181 | break; | |
60ecc450 | 3182 | } |
3183 | ||
365db11e | 3184 | /* If tail call production succeeded, we need to remove REG_EQUIV notes on |
4ee9c684 | 3185 | arguments too, as argument area is now clobbered by the call. */ |
3186 | if (tail_call_insns) | |
60ecc450 | 3187 | { |
4ee9c684 | 3188 | emit_insn (tail_call_insns); |
3189 | cfun->tail_call_emit = true; | |
60ecc450 | 3190 | } |
3191 | else | |
31d3e01c | 3192 | emit_insn (normal_call_insns); |
66d433c7 | 3193 | |
60ecc450 | 3194 | currently_expanding_call--; |
6d801f27 | 3195 | |
d490e2f2 | 3196 | /* If this function returns with the stack pointer depressed, ensure |
3197 | this block saves and restores the stack pointer, show it was | |
3198 | changed, and adjust for any outgoing arg space. */ | |
3199 | if (flags & ECF_SP_DEPRESSED) | |
3200 | { | |
3201 | clear_pending_stack_adjust (); | |
943d05fc | 3202 | emit_insn (gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx)); |
d490e2f2 | 3203 | emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx); |
d490e2f2 | 3204 | } |
3205 | ||
66d433c7 | 3206 | return target; |
3207 | } | |
915e81b8 | 3208 | |
4ee9c684 | 3209 | /* A sibling call sequence invalidates any REG_EQUIV notes made for |
3210 | this function's incoming arguments. | |
3211 | ||
3212 | At the start of RTL generation we know the only REG_EQUIV notes | |
3213 | in the rtl chain are those for incoming arguments, so we can safely | |
3214 | flush any REG_EQUIV note. | |
3215 | ||
3216 | This is (slight) overkill. We could keep track of the highest | |
3217 | argument we clobber and be more selective in removing notes, but it | |
3218 | does not seem to be worth the effort. */ | |
3219 | void | |
3220 | fixup_tail_calls (void) | |
3221 | { | |
3222 | rtx insn; | |
3223 | tree arg; | |
3224 | ||
3225 | purge_reg_equiv_notes (); | |
3226 | ||
3227 | /* A sibling call sequence also may invalidate RTX_UNCHANGING_P | |
3228 | flag of some incoming arguments MEM RTLs, because it can write into | |
3229 | those slots. We clear all those bits now. | |
3230 | ||
3231 | This is (slight) overkill, we could keep track of which arguments | |
3232 | we actually write into. */ | |
3233 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3234 | { | |
3235 | if (INSN_P (insn)) | |
3236 | purge_mem_unchanging_flag (PATTERN (insn)); | |
3237 | } | |
3238 | ||
3239 | /* Similarly, invalidate RTX_UNCHANGING_P for any incoming | |
3240 | arguments passed in registers. */ | |
3241 | for (arg = DECL_ARGUMENTS (current_function_decl); | |
3242 | arg; | |
3243 | arg = TREE_CHAIN (arg)) | |
3244 | { | |
3245 | if (REG_P (DECL_RTL (arg))) | |
3246 | RTX_UNCHANGING_P (DECL_RTL (arg)) = false; | |
3247 | } | |
3248 | } | |
3249 | ||
915e81b8 | 3250 | /* Traverse an argument list in VALUES and expand all complex |
3251 | arguments into their components. */ | |
3252 | tree | |
3253 | split_complex_values (tree values) | |
3254 | { | |
3255 | tree p; | |
3256 | ||
92d40bc4 | 3257 | /* Before allocating memory, check for the common case of no complex. */ |
3258 | for (p = values; p; p = TREE_CHAIN (p)) | |
3259 | { | |
3260 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
3261 | if (type && TREE_CODE (type) == COMPLEX_TYPE | |
3262 | && targetm.calls.split_complex_arg (type)) | |
3263 | goto found; | |
3264 | } | |
3265 | return values; | |
3266 | ||
3267 | found: | |
915e81b8 | 3268 | values = copy_list (values); |
3269 | ||
3270 | for (p = values; p; p = TREE_CHAIN (p)) | |
3271 | { | |
3272 | tree complex_value = TREE_VALUE (p); | |
3273 | tree complex_type; | |
3274 | ||
3275 | complex_type = TREE_TYPE (complex_value); | |
3276 | if (!complex_type) | |
3277 | continue; | |
3278 | ||
92d40bc4 | 3279 | if (TREE_CODE (complex_type) == COMPLEX_TYPE |
3280 | && targetm.calls.split_complex_arg (complex_type)) | |
915e81b8 | 3281 | { |
3282 | tree subtype; | |
3283 | tree real, imag, next; | |
3284 | ||
3285 | subtype = TREE_TYPE (complex_type); | |
3286 | complex_value = save_expr (complex_value); | |
3287 | real = build1 (REALPART_EXPR, subtype, complex_value); | |
3288 | imag = build1 (IMAGPART_EXPR, subtype, complex_value); | |
3289 | ||
3290 | TREE_VALUE (p) = real; | |
3291 | next = TREE_CHAIN (p); | |
3292 | imag = build_tree_list (NULL_TREE, imag); | |
3293 | TREE_CHAIN (p) = imag; | |
3294 | TREE_CHAIN (imag) = next; | |
3295 | ||
3296 | /* Skip the newly created node. */ | |
3297 | p = TREE_CHAIN (p); | |
3298 | } | |
3299 | } | |
3300 | ||
3301 | return values; | |
3302 | } | |
3303 | ||
3304 | /* Traverse a list of TYPES and expand all complex types into their | |
3305 | components. */ | |
3306 | tree | |
3307 | split_complex_types (tree types) | |
3308 | { | |
3309 | tree p; | |
3310 | ||
92d40bc4 | 3311 | /* Before allocating memory, check for the common case of no complex. */ |
3312 | for (p = types; p; p = TREE_CHAIN (p)) | |
3313 | { | |
3314 | tree type = TREE_VALUE (p); | |
3315 | if (TREE_CODE (type) == COMPLEX_TYPE | |
3316 | && targetm.calls.split_complex_arg (type)) | |
3317 | goto found; | |
3318 | } | |
3319 | return types; | |
3320 | ||
3321 | found: | |
915e81b8 | 3322 | types = copy_list (types); |
3323 | ||
3324 | for (p = types; p; p = TREE_CHAIN (p)) | |
3325 | { | |
3326 | tree complex_type = TREE_VALUE (p); | |
3327 | ||
92d40bc4 | 3328 | if (TREE_CODE (complex_type) == COMPLEX_TYPE |
3329 | && targetm.calls.split_complex_arg (complex_type)) | |
915e81b8 | 3330 | { |
3331 | tree next, imag; | |
3332 | ||
3333 | /* Rewrite complex type with component type. */ | |
3334 | TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3335 | next = TREE_CHAIN (p); | |
3336 | ||
3337 | /* Add another component type for the imaginary part. */ | |
3338 | imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3339 | TREE_CHAIN (p) = imag; | |
3340 | TREE_CHAIN (imag) = next; | |
3341 | ||
3342 | /* Skip the newly created node. */ | |
3343 | p = TREE_CHAIN (p); | |
3344 | } | |
3345 | } | |
3346 | ||
3347 | return types; | |
3348 | } | |
66d433c7 | 3349 | \f |
20f7032f | 3350 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
c87678e4 | 3351 | The RETVAL parameter specifies whether return value needs to be saved, other |
ebf77775 | 3352 | parameters are documented in the emit_library_call function below. */ |
2a631e19 | 3353 | |
20f7032f | 3354 | static rtx |
4c9e08a4 | 3355 | emit_library_call_value_1 (int retval, rtx orgfun, rtx value, |
3356 | enum libcall_type fn_type, | |
3357 | enum machine_mode outmode, int nargs, va_list p) | |
b39693dd | 3358 | { |
9bdaf1ba | 3359 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3360 | struct args_size args_size; | |
3361 | /* Size of arguments before any adjustments (such as rounding). */ | |
3362 | struct args_size original_args_size; | |
19cb6b50 | 3363 | int argnum; |
9bdaf1ba | 3364 | rtx fun; |
3365 | int inc; | |
3366 | int count; | |
9bdaf1ba | 3367 | rtx argblock = 0; |
3368 | CUMULATIVE_ARGS args_so_far; | |
c87678e4 | 3369 | struct arg |
3370 | { | |
3371 | rtx value; | |
3372 | enum machine_mode mode; | |
3373 | rtx reg; | |
3374 | int partial; | |
241399f6 | 3375 | struct locate_and_pad_arg_data locate; |
c87678e4 | 3376 | rtx save_area; |
3377 | }; | |
9bdaf1ba | 3378 | struct arg *argvec; |
3379 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3380 | rtx call_fusage = 0; | |
3381 | rtx mem_value = 0; | |
16204096 | 3382 | rtx valreg; |
9bdaf1ba | 3383 | int pcc_struct_value = 0; |
3384 | int struct_value_size = 0; | |
df4b504c | 3385 | int flags; |
9bdaf1ba | 3386 | int reg_parm_stack_space = 0; |
9bdaf1ba | 3387 | int needed; |
644c283b | 3388 | rtx before_call; |
771d21fa | 3389 | tree tfom; /* type_for_mode (outmode, 0) */ |
9bdaf1ba | 3390 | |
4448f543 | 3391 | #ifdef REG_PARM_STACK_SPACE |
9bdaf1ba | 3392 | /* Define the boundary of the register parm stack space that needs to be |
3393 | save, if any. */ | |
6e96b626 | 3394 | int low_to_save, high_to_save; |
c87678e4 | 3395 | rtx save_area = 0; /* Place that it is saved. */ |
9bdaf1ba | 3396 | #endif |
3397 | ||
9bdaf1ba | 3398 | /* Size of the stack reserved for parameter registers. */ |
3399 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3400 | char *initial_stack_usage_map = stack_usage_map; | |
9bdaf1ba | 3401 | |
45550790 | 3402 | rtx struct_value = targetm.calls.struct_value_rtx (0, 0); |
3403 | ||
9bdaf1ba | 3404 | #ifdef REG_PARM_STACK_SPACE |
9bdaf1ba | 3405 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); |
9bdaf1ba | 3406 | #endif |
3407 | ||
ab7ccfa2 | 3408 | /* By default, library functions can not throw. */ |
df4b504c | 3409 | flags = ECF_NOTHROW; |
3410 | ||
ab7ccfa2 | 3411 | switch (fn_type) |
3412 | { | |
3413 | case LCT_NORMAL: | |
2a0c81bf | 3414 | break; |
ab7ccfa2 | 3415 | case LCT_CONST: |
2a0c81bf | 3416 | flags |= ECF_CONST; |
3417 | break; | |
ab7ccfa2 | 3418 | case LCT_PURE: |
2a0c81bf | 3419 | flags |= ECF_PURE; |
ab7ccfa2 | 3420 | break; |
3421 | case LCT_CONST_MAKE_BLOCK: | |
2a0c81bf | 3422 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
ab7ccfa2 | 3423 | break; |
3424 | case LCT_PURE_MAKE_BLOCK: | |
2a0c81bf | 3425 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
ab7ccfa2 | 3426 | break; |
3427 | case LCT_NORETURN: | |
3428 | flags |= ECF_NORETURN; | |
3429 | break; | |
3430 | case LCT_THROW: | |
3431 | flags = ECF_NORETURN; | |
3432 | break; | |
6d8a270d | 3433 | case LCT_ALWAYS_RETURN: |
3434 | flags = ECF_ALWAYS_RETURN; | |
3435 | break; | |
0ff18307 | 3436 | case LCT_RETURNS_TWICE: |
3437 | flags = ECF_RETURNS_TWICE; | |
3438 | break; | |
ab7ccfa2 | 3439 | } |
9bdaf1ba | 3440 | fun = orgfun; |
3441 | ||
9bdaf1ba | 3442 | /* Ensure current function's preferred stack boundary is at least |
3443 | what we need. */ | |
3444 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3445 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
9bdaf1ba | 3446 | |
3447 | /* If this kind of value comes back in memory, | |
3448 | decide where in memory it should come back. */ | |
771d21fa | 3449 | if (outmode != VOIDmode) |
9bdaf1ba | 3450 | { |
dc24ddbd | 3451 | tfom = lang_hooks.types.type_for_mode (outmode, 0); |
45550790 | 3452 | if (aggregate_value_p (tfom, 0)) |
771d21fa | 3453 | { |
9bdaf1ba | 3454 | #ifdef PCC_STATIC_STRUCT_RETURN |
771d21fa | 3455 | rtx pointer_reg |
3456 | = hard_function_value (build_pointer_type (tfom), 0, 0); | |
3457 | mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3458 | pcc_struct_value = 1; | |
3459 | if (value == 0) | |
3460 | value = gen_reg_rtx (outmode); | |
9bdaf1ba | 3461 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
771d21fa | 3462 | struct_value_size = GET_MODE_SIZE (outmode); |
e16ceb8e | 3463 | if (value != 0 && MEM_P (value)) |
771d21fa | 3464 | mem_value = value; |
3465 | else | |
3466 | mem_value = assign_temp (tfom, 0, 1, 1); | |
9bdaf1ba | 3467 | #endif |
771d21fa | 3468 | /* This call returns a big structure. */ |
3469 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3470 | } | |
9bdaf1ba | 3471 | } |
771d21fa | 3472 | else |
3473 | tfom = void_type_node; | |
9bdaf1ba | 3474 | |
3475 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3476 | ||
3477 | /* Copy all the libcall-arguments out of the varargs data | |
3478 | and into a vector ARGVEC. | |
3479 | ||
3480 | Compute how to pass each argument. We only support a very small subset | |
3481 | of the full argument passing conventions to limit complexity here since | |
3482 | library functions shouldn't have many args. */ | |
3483 | ||
f0af5a88 | 3484 | argvec = alloca ((nargs + 1) * sizeof (struct arg)); |
3485 | memset (argvec, 0, (nargs + 1) * sizeof (struct arg)); | |
9bdaf1ba | 3486 | |
e1efd914 | 3487 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3488 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3489 | #else | |
30c70355 | 3490 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0, nargs); |
e1efd914 | 3491 | #endif |
9bdaf1ba | 3492 | |
3493 | args_size.constant = 0; | |
3494 | args_size.var = 0; | |
3495 | ||
3496 | count = 0; | |
3497 | ||
2c5d421b | 3498 | /* Now we are about to start emitting insns that can be deleted |
3499 | if a libcall is deleted. */ | |
2a0c81bf | 3500 | if (flags & ECF_LIBCALL_BLOCK) |
2c5d421b | 3501 | start_sequence (); |
3502 | ||
9bdaf1ba | 3503 | push_temp_slots (); |
3504 | ||
3505 | /* If there's a structure value address to be passed, | |
3506 | either pass it in the special place, or pass it as an extra argument. */ | |
45550790 | 3507 | if (mem_value && struct_value == 0 && ! pcc_struct_value) |
9bdaf1ba | 3508 | { |
3509 | rtx addr = XEXP (mem_value, 0); | |
3510 | nargs++; | |
3511 | ||
3512 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
e16ceb8e | 3513 | if (!REG_P (addr) && !MEM_P (addr) |
9bdaf1ba | 3514 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) |
3515 | addr = force_operand (addr, NULL_RTX); | |
3516 | ||
3517 | argvec[count].value = addr; | |
3518 | argvec[count].mode = Pmode; | |
3519 | argvec[count].partial = 0; | |
3520 | ||
3521 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
9bdaf1ba | 3522 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) |
3523 | abort (); | |
9bdaf1ba | 3524 | |
3525 | locate_and_pad_parm (Pmode, NULL_TREE, | |
2e735c0d | 3526 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3527 | 1, | |
3528 | #else | |
3529 | argvec[count].reg != 0, | |
3530 | #endif | |
241399f6 | 3531 | 0, NULL_TREE, &args_size, &argvec[count].locate); |
9bdaf1ba | 3532 | |
9bdaf1ba | 3533 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3534 | || reg_parm_stack_space > 0) | |
241399f6 | 3535 | args_size.constant += argvec[count].locate.size.constant; |
9bdaf1ba | 3536 | |
3537 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3538 | ||
3539 | count++; | |
3540 | } | |
3541 | ||
3542 | for (; count < nargs; count++) | |
3543 | { | |
3544 | rtx val = va_arg (p, rtx); | |
3545 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3546 | ||
3547 | /* We cannot convert the arg value to the mode the library wants here; | |
3548 | must do it earlier where we know the signedness of the arg. */ | |
3549 | if (mode == BLKmode | |
3550 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
3551 | abort (); | |
3552 | ||
9bdaf1ba | 3553 | /* There's no need to call protect_from_queue, because |
3554 | either emit_move_insn or emit_push_insn will do that. */ | |
3555 | ||
3556 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
e16ceb8e | 3557 | if (!REG_P (val) && !MEM_P (val) |
9bdaf1ba | 3558 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) |
3559 | val = force_operand (val, NULL_RTX); | |
3560 | ||
9bdaf1ba | 3561 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) |
3562 | { | |
ddaf7ad3 | 3563 | rtx slot; |
6fe3d4d2 | 3564 | int must_copy = ! FUNCTION_ARG_CALLEE_COPIES (args_so_far, mode, |
3565 | NULL_TREE, 1); | |
ddaf7ad3 | 3566 | |
aeeed45c | 3567 | /* loop.c won't look at CALL_INSN_FUNCTION_USAGE of const/pure |
3568 | functions, so we have to pretend this isn't such a function. */ | |
3569 | if (flags & ECF_LIBCALL_BLOCK) | |
3570 | { | |
3571 | rtx insns = get_insns (); | |
3572 | end_sequence (); | |
3573 | emit_insn (insns); | |
3574 | } | |
3575 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3576 | ||
5096b8b0 | 3577 | /* If this was a CONST function, it is now PURE since |
3578 | it now reads memory. */ | |
3579 | if (flags & ECF_CONST) | |
3580 | { | |
3581 | flags &= ~ECF_CONST; | |
3582 | flags |= ECF_PURE; | |
3583 | } | |
3584 | ||
ddaf7ad3 | 3585 | if (GET_MODE (val) == MEM && ! must_copy) |
3586 | slot = val; | |
3587 | else if (must_copy) | |
3588 | { | |
dc24ddbd | 3589 | slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0), |
771d21fa | 3590 | 0, 1, 1); |
ddaf7ad3 | 3591 | emit_move_insn (slot, val); |
3592 | } | |
3593 | else | |
3594 | { | |
dc24ddbd | 3595 | tree type = lang_hooks.types.type_for_mode (mode, 0); |
ddaf7ad3 | 3596 | |
fd2c0c1d | 3597 | slot |
3598 | = gen_rtx_MEM (mode, | |
3599 | expand_expr (build1 (ADDR_EXPR, | |
3600 | build_pointer_type (type), | |
3601 | make_tree (type, val)), | |
3602 | NULL_RTX, VOIDmode, 0)); | |
ddaf7ad3 | 3603 | } |
387bc205 | 3604 | |
a683e787 | 3605 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3606 | gen_rtx_USE (VOIDmode, slot), | |
3607 | call_fusage); | |
ddaf7ad3 | 3608 | if (must_copy) |
3609 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3610 | gen_rtx_CLOBBER (VOIDmode, | |
3611 | slot), | |
3612 | call_fusage); | |
3613 | ||
9bdaf1ba | 3614 | mode = Pmode; |
ddaf7ad3 | 3615 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
9bdaf1ba | 3616 | } |
9bdaf1ba | 3617 | |
3618 | argvec[count].value = val; | |
3619 | argvec[count].mode = mode; | |
3620 | ||
3621 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3622 | ||
9bdaf1ba | 3623 | argvec[count].partial |
3624 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
9bdaf1ba | 3625 | |
3626 | locate_and_pad_parm (mode, NULL_TREE, | |
2e735c0d | 3627 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
c87678e4 | 3628 | 1, |
2e735c0d | 3629 | #else |
3630 | argvec[count].reg != 0, | |
3631 | #endif | |
241399f6 | 3632 | argvec[count].partial, |
3633 | NULL_TREE, &args_size, &argvec[count].locate); | |
9bdaf1ba | 3634 | |
241399f6 | 3635 | if (argvec[count].locate.size.var) |
9bdaf1ba | 3636 | abort (); |
3637 | ||
9bdaf1ba | 3638 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3639 | || reg_parm_stack_space > 0) | |
241399f6 | 3640 | args_size.constant += argvec[count].locate.size.constant; |
9bdaf1ba | 3641 | |
3642 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3643 | } | |
9bdaf1ba | 3644 | |
9bdaf1ba | 3645 | /* If this machine requires an external definition for library |
3646 | functions, write one out. */ | |
3647 | assemble_external_libcall (fun); | |
3648 | ||
3649 | original_args_size = args_size; | |
91b70175 | 3650 | args_size.constant = (((args_size.constant |
3651 | + stack_pointer_delta | |
3652 | + STACK_BYTES - 1) | |
3653 | / STACK_BYTES | |
3654 | * STACK_BYTES) | |
3655 | - stack_pointer_delta); | |
9bdaf1ba | 3656 | |
3657 | args_size.constant = MAX (args_size.constant, | |
3658 | reg_parm_stack_space); | |
3659 | ||
3660 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3661 | args_size.constant -= reg_parm_stack_space; | |
3662 | #endif | |
3663 | ||
3664 | if (args_size.constant > current_function_outgoing_args_size) | |
3665 | current_function_outgoing_args_size = args_size.constant; | |
3666 | ||
4448f543 | 3667 | if (ACCUMULATE_OUTGOING_ARGS) |
3668 | { | |
3669 | /* Since the stack pointer will never be pushed, it is possible for | |
3670 | the evaluation of a parm to clobber something we have already | |
3671 | written to the stack. Since most function calls on RISC machines | |
3672 | do not use the stack, this is uncommon, but must work correctly. | |
9bdaf1ba | 3673 | |
4448f543 | 3674 | Therefore, we save any area of the stack that was already written |
3675 | and that we are using. Here we set up to do this by making a new | |
3676 | stack usage map from the old one. | |
9bdaf1ba | 3677 | |
4448f543 | 3678 | Another approach might be to try to reorder the argument |
3679 | evaluations to avoid this conflicting stack usage. */ | |
9bdaf1ba | 3680 | |
4448f543 | 3681 | needed = args_size.constant; |
9bdaf1ba | 3682 | |
3683 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
4448f543 | 3684 | /* Since we will be writing into the entire argument area, the |
3685 | map must be allocated for its entire size, not just the part that | |
3686 | is the responsibility of the caller. */ | |
3687 | needed += reg_parm_stack_space; | |
9bdaf1ba | 3688 | #endif |
3689 | ||
3690 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3691 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3692 | needed + 1); | |
9bdaf1ba | 3693 | #else |
4448f543 | 3694 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3695 | needed); | |
9bdaf1ba | 3696 | #endif |
f0af5a88 | 3697 | stack_usage_map = alloca (highest_outgoing_arg_in_use); |
9bdaf1ba | 3698 | |
4448f543 | 3699 | if (initial_highest_arg_in_use) |
8e547276 | 3700 | memcpy (stack_usage_map, initial_stack_usage_map, |
3701 | initial_highest_arg_in_use); | |
9bdaf1ba | 3702 | |
4448f543 | 3703 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
93d3b7de | 3704 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
4448f543 | 3705 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3706 | needed = 0; | |
9bdaf1ba | 3707 | |
9c0a756f | 3708 | /* We must be careful to use virtual regs before they're instantiated, |
3709 | and real regs afterwards. Loop optimization, for example, can create | |
3710 | new libcalls after we've instantiated the virtual regs, and if we | |
3711 | use virtuals anyway, they won't match the rtl patterns. */ | |
9bdaf1ba | 3712 | |
9c0a756f | 3713 | if (virtuals_instantiated) |
3714 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3715 | else | |
3716 | argblock = virtual_outgoing_args_rtx; | |
4448f543 | 3717 | } |
3718 | else | |
3719 | { | |
3720 | if (!PUSH_ARGS) | |
3721 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3722 | } | |
9bdaf1ba | 3723 | |
9bdaf1ba | 3724 | /* If we push args individually in reverse order, perform stack alignment |
3725 | before the first push (the last arg). */ | |
4448f543 | 3726 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
9bdaf1ba | 3727 | anti_adjust_stack (GEN_INT (args_size.constant |
3728 | - original_args_size.constant)); | |
9bdaf1ba | 3729 | |
4448f543 | 3730 | if (PUSH_ARGS_REVERSED) |
3731 | { | |
3732 | inc = -1; | |
3733 | argnum = nargs - 1; | |
3734 | } | |
3735 | else | |
3736 | { | |
3737 | inc = 1; | |
3738 | argnum = 0; | |
3739 | } | |
9bdaf1ba | 3740 | |
4448f543 | 3741 | #ifdef REG_PARM_STACK_SPACE |
3742 | if (ACCUMULATE_OUTGOING_ARGS) | |
3743 | { | |
3744 | /* The argument list is the property of the called routine and it | |
3745 | may clobber it. If the fixed area has been used for previous | |
6e96b626 | 3746 | parameters, we must save and restore it. */ |
3747 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3748 | &low_to_save, &high_to_save); | |
9bdaf1ba | 3749 | } |
3750 | #endif | |
c87678e4 | 3751 | |
9bdaf1ba | 3752 | /* Push the args that need to be pushed. */ |
3753 | ||
3754 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3755 | are to be pushed. */ | |
3756 | for (count = 0; count < nargs; count++, argnum += inc) | |
3757 | { | |
19cb6b50 | 3758 | enum machine_mode mode = argvec[argnum].mode; |
3759 | rtx val = argvec[argnum].value; | |
9bdaf1ba | 3760 | rtx reg = argvec[argnum].reg; |
3761 | int partial = argvec[argnum].partial; | |
4448f543 | 3762 | int lower_bound = 0, upper_bound = 0, i; |
9bdaf1ba | 3763 | |
3764 | if (! (reg != 0 && partial == 0)) | |
3765 | { | |
4448f543 | 3766 | if (ACCUMULATE_OUTGOING_ARGS) |
3767 | { | |
02510658 | 3768 | /* If this is being stored into a pre-allocated, fixed-size, |
3769 | stack area, save any previous data at that location. */ | |
9bdaf1ba | 3770 | |
3771 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3772 | /* stack_slot is negative, but we want to index stack_usage_map |
3773 | with positive values. */ | |
241399f6 | 3774 | upper_bound = -argvec[argnum].locate.offset.constant + 1; |
3775 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; | |
9bdaf1ba | 3776 | #else |
241399f6 | 3777 | lower_bound = argvec[argnum].locate.offset.constant; |
3778 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; | |
9bdaf1ba | 3779 | #endif |
3780 | ||
fd2c0c1d | 3781 | i = lower_bound; |
3782 | /* Don't worry about things in the fixed argument area; | |
3783 | it has already been saved. */ | |
3784 | if (i < reg_parm_stack_space) | |
3785 | i = reg_parm_stack_space; | |
3786 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3787 | i++; | |
9bdaf1ba | 3788 | |
fd2c0c1d | 3789 | if (i < upper_bound) |
4448f543 | 3790 | { |
241399f6 | 3791 | /* We need to make a save area. */ |
3792 | unsigned int size | |
3793 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
4448f543 | 3794 | enum machine_mode save_mode |
241399f6 | 3795 | = mode_for_size (size, MODE_INT, 1); |
3796 | rtx adr | |
3797 | = plus_constant (argblock, | |
3798 | argvec[argnum].locate.offset.constant); | |
4448f543 | 3799 | rtx stack_area |
241399f6 | 3800 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
4448f543 | 3801 | |
f9c6a9c3 | 3802 | if (save_mode == BLKmode) |
3803 | { | |
3804 | argvec[argnum].save_area | |
3805 | = assign_stack_temp (BLKmode, | |
3806 | argvec[argnum].locate.size.constant, | |
3807 | 0); | |
3808 | ||
3809 | emit_block_move (validize_mem (argvec[argnum].save_area), | |
3810 | stack_area, | |
3811 | GEN_INT (argvec[argnum].locate.size.constant), | |
3812 | BLOCK_OP_CALL_PARM); | |
3813 | } | |
3814 | else | |
3815 | { | |
3816 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3817 | ||
3818 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3819 | } | |
4448f543 | 3820 | } |
9bdaf1ba | 3821 | } |
325d1c45 | 3822 | |
0378dbdc | 3823 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, PARM_BOUNDARY, |
3824 | partial, reg, 0, argblock, | |
241399f6 | 3825 | GEN_INT (argvec[argnum].locate.offset.constant), |
3826 | reg_parm_stack_space, | |
3827 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
9bdaf1ba | 3828 | |
9bdaf1ba | 3829 | /* Now mark the segment we just used. */ |
4448f543 | 3830 | if (ACCUMULATE_OUTGOING_ARGS) |
3831 | for (i = lower_bound; i < upper_bound; i++) | |
3832 | stack_usage_map[i] = 1; | |
9bdaf1ba | 3833 | |
3834 | NO_DEFER_POP; | |
3835 | } | |
3836 | } | |
3837 | ||
9bdaf1ba | 3838 | /* If we pushed args in forward order, perform stack alignment |
3839 | after pushing the last arg. */ | |
4448f543 | 3840 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
9bdaf1ba | 3841 | anti_adjust_stack (GEN_INT (args_size.constant |
3842 | - original_args_size.constant)); | |
9bdaf1ba | 3843 | |
4448f543 | 3844 | if (PUSH_ARGS_REVERSED) |
3845 | argnum = nargs - 1; | |
3846 | else | |
3847 | argnum = 0; | |
9bdaf1ba | 3848 | |
4ee9c684 | 3849 | fun = prepare_call_address (fun, NULL, &call_fusage, 0, 0); |
9bdaf1ba | 3850 | |
3851 | /* Now load any reg parms into their regs. */ | |
3852 | ||
3853 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3854 | are to be pushed. */ | |
3855 | for (count = 0; count < nargs; count++, argnum += inc) | |
3856 | { | |
bec917cc | 3857 | enum machine_mode mode = argvec[argnum].mode; |
19cb6b50 | 3858 | rtx val = argvec[argnum].value; |
9bdaf1ba | 3859 | rtx reg = argvec[argnum].reg; |
3860 | int partial = argvec[argnum].partial; | |
3861 | ||
3862 | /* Handle calls that pass values in multiple non-contiguous | |
3863 | locations. The PA64 has examples of this for library calls. */ | |
3864 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
bec917cc | 3865 | emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode)); |
9bdaf1ba | 3866 | else if (reg != 0 && partial == 0) |
3867 | emit_move_insn (reg, val); | |
3868 | ||
3869 | NO_DEFER_POP; | |
3870 | } | |
3871 | ||
9bdaf1ba | 3872 | /* Any regs containing parms remain in use through the call. */ |
3873 | for (count = 0; count < nargs; count++) | |
3874 | { | |
3875 | rtx reg = argvec[count].reg; | |
3876 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3877 | use_group_regs (&call_fusage, reg); | |
3878 | else if (reg != 0) | |
3879 | use_reg (&call_fusage, reg); | |
3880 | } | |
3881 | ||
3882 | /* Pass the function the address in which to return a structure value. */ | |
45550790 | 3883 | if (mem_value != 0 && struct_value != 0 && ! pcc_struct_value) |
9bdaf1ba | 3884 | { |
45550790 | 3885 | emit_move_insn (struct_value, |
9bdaf1ba | 3886 | force_reg (Pmode, |
3887 | force_operand (XEXP (mem_value, 0), | |
3888 | NULL_RTX))); | |
8ad4c111 | 3889 | if (REG_P (struct_value)) |
45550790 | 3890 | use_reg (&call_fusage, struct_value); |
9bdaf1ba | 3891 | } |
3892 | ||
3893 | /* Don't allow popping to be deferred, since then | |
3894 | cse'ing of library calls could delete a call and leave the pop. */ | |
3895 | NO_DEFER_POP; | |
16204096 | 3896 | valreg = (mem_value == 0 && outmode != VOIDmode |
3897 | ? hard_libcall_value (outmode) : NULL_RTX); | |
9bdaf1ba | 3898 | |
481feae3 | 3899 | /* Stack must be properly aligned now. */ |
fa4f1f09 | 3900 | if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)) |
c87678e4 | 3901 | abort (); |
fa4f1f09 | 3902 | |
644c283b | 3903 | before_call = get_last_insn (); |
3904 | ||
9bdaf1ba | 3905 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
3906 | will set inhibit_defer_pop to that value. */ | |
20f7032f | 3907 | /* The return type is needed to decide how many bytes the function pops. |
3908 | Signedness plays no role in that, so for simplicity, we pretend it's | |
3909 | always signed. We also assume that the list of arguments passed has | |
3910 | no impact, so we pretend it is unknown. */ | |
9bdaf1ba | 3911 | |
4ee9c684 | 3912 | emit_call_1 (fun, NULL, |
c87678e4 | 3913 | get_identifier (XSTR (orgfun, 0)), |
771d21fa | 3914 | build_function_type (tfom, NULL_TREE), |
c87678e4 | 3915 | original_args_size.constant, args_size.constant, |
9bdaf1ba | 3916 | struct_value_size, |
3917 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
16204096 | 3918 | valreg, |
87e19636 | 3919 | old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); |
9bdaf1ba | 3920 | |
644c283b | 3921 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3922 | if nonvolatile values are live. For functions that cannot return, | |
3923 | inform flow that control does not fall through. */ | |
3924 | ||
9239aee6 | 3925 | if (flags & (ECF_NORETURN | ECF_LONGJMP)) |
644c283b | 3926 | { |
9239aee6 | 3927 | /* The barrier note must be emitted |
644c283b | 3928 | immediately after the CALL_INSN. Some ports emit more than |
3929 | just a CALL_INSN above, so we must search for it here. */ | |
3930 | ||
3931 | rtx last = get_last_insn (); | |
6d7dc5b9 | 3932 | while (!CALL_P (last)) |
644c283b | 3933 | { |
3934 | last = PREV_INSN (last); | |
3935 | /* There was no CALL_INSN? */ | |
3936 | if (last == before_call) | |
3937 | abort (); | |
3938 | } | |
3939 | ||
9239aee6 | 3940 | emit_barrier_after (last); |
644c283b | 3941 | } |
3942 | ||
9bdaf1ba | 3943 | /* Now restore inhibit_defer_pop to its actual original value. */ |
3944 | OK_DEFER_POP; | |
3945 | ||
2c5d421b | 3946 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
3947 | Test valreg so we don't crash; may safely ignore `const' | |
3948 | if return type is void. Disable for PARALLEL return values, because | |
3949 | we have no way to move such values into a pseudo register. */ | |
2a0c81bf | 3950 | if (flags & ECF_LIBCALL_BLOCK) |
2c5d421b | 3951 | { |
2c5d421b | 3952 | rtx insns; |
2c5d421b | 3953 | |
40651bac | 3954 | if (valreg == 0) |
6e17d606 | 3955 | { |
3956 | insns = get_insns (); | |
3957 | end_sequence (); | |
31d3e01c | 3958 | emit_insn (insns); |
6e17d606 | 3959 | } |
3960 | else | |
3961 | { | |
3962 | rtx note = 0; | |
40651bac | 3963 | rtx temp; |
6e17d606 | 3964 | int i; |
2c5d421b | 3965 | |
40651bac | 3966 | if (GET_CODE (valreg) == PARALLEL) |
3967 | { | |
3968 | temp = gen_reg_rtx (outmode); | |
4c3a0ea5 | 3969 | emit_group_store (temp, valreg, NULL_TREE, |
3970 | GET_MODE_SIZE (outmode)); | |
40651bac | 3971 | valreg = temp; |
3972 | } | |
3973 | ||
3974 | temp = gen_reg_rtx (GET_MODE (valreg)); | |
3975 | ||
6e17d606 | 3976 | /* Construct an "equal form" for the value which mentions all the |
3977 | arguments in order as well as the function name. */ | |
3978 | for (i = 0; i < nargs; i++) | |
3979 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
3980 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
2c5d421b | 3981 | |
6e17d606 | 3982 | insns = get_insns (); |
3983 | end_sequence (); | |
2c5d421b | 3984 | |
6e17d606 | 3985 | if (flags & ECF_PURE) |
3986 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3987 | gen_rtx_USE (VOIDmode, | |
3988 | gen_rtx_MEM (BLKmode, | |
3989 | gen_rtx_SCRATCH (VOIDmode))), | |
3990 | note); | |
3991 | ||
3992 | emit_libcall_block (insns, temp, valreg, note); | |
2c5d421b | 3993 | |
6e17d606 | 3994 | valreg = temp; |
3995 | } | |
2c5d421b | 3996 | } |
9bdaf1ba | 3997 | pop_temp_slots (); |
3998 | ||
3999 | /* Copy the value to the right place. */ | |
20f7032f | 4000 | if (outmode != VOIDmode && retval) |
9bdaf1ba | 4001 | { |
4002 | if (mem_value) | |
4003 | { | |
4004 | if (value == 0) | |
4005 | value = mem_value; | |
4006 | if (value != mem_value) | |
4007 | emit_move_insn (value, mem_value); | |
4008 | } | |
40651bac | 4009 | else if (GET_CODE (valreg) == PARALLEL) |
4010 | { | |
4011 | if (value == 0) | |
4012 | value = gen_reg_rtx (outmode); | |
4c3a0ea5 | 4013 | emit_group_store (value, valreg, NULL_TREE, GET_MODE_SIZE (outmode)); |
40651bac | 4014 | } |
9bdaf1ba | 4015 | else if (value != 0) |
26906dc1 | 4016 | emit_move_insn (value, valreg); |
9bdaf1ba | 4017 | else |
26906dc1 | 4018 | value = valreg; |
9bdaf1ba | 4019 | } |
4020 | ||
4448f543 | 4021 | if (ACCUMULATE_OUTGOING_ARGS) |
9bdaf1ba | 4022 | { |
4448f543 | 4023 | #ifdef REG_PARM_STACK_SPACE |
4024 | if (save_area) | |
6e96b626 | 4025 | restore_fixed_argument_area (save_area, argblock, |
4026 | high_to_save, low_to_save); | |
9bdaf1ba | 4027 | #endif |
c87678e4 | 4028 | |
4448f543 | 4029 | /* If we saved any argument areas, restore them. */ |
4030 | for (count = 0; count < nargs; count++) | |
4031 | if (argvec[count].save_area) | |
4032 | { | |
4033 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
241399f6 | 4034 | rtx adr = plus_constant (argblock, |
4035 | argvec[count].locate.offset.constant); | |
4036 | rtx stack_area = gen_rtx_MEM (save_mode, | |
4037 | memory_address (save_mode, adr)); | |
4448f543 | 4038 | |
f9c6a9c3 | 4039 | if (save_mode == BLKmode) |
4040 | emit_block_move (stack_area, | |
4041 | validize_mem (argvec[count].save_area), | |
4042 | GEN_INT (argvec[count].locate.size.constant), | |
4043 | BLOCK_OP_CALL_PARM); | |
4044 | else | |
4045 | emit_move_insn (stack_area, argvec[count].save_area); | |
4448f543 | 4046 | } |
9bdaf1ba | 4047 | |
4448f543 | 4048 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4049 | stack_usage_map = initial_stack_usage_map; | |
4050 | } | |
b39693dd | 4051 | |
20f7032f | 4052 | return value; |
4053 | ||
4054 | } | |
4055 | \f | |
4056 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4057 | (emitting the queue unless NO_QUEUE is nonzero), | |
4058 | for a value of mode OUTMODE, | |
4059 | with NARGS different arguments, passed as alternating rtx values | |
4060 | and machine_modes to convert them to. | |
4061 | The rtx values should have been passed through protect_from_queue already. | |
4062 | ||
0ba5f96c | 4063 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for `const' |
4064 | calls, LCT_PURE for `pure' calls, LCT_CONST_MAKE_BLOCK for `const' calls | |
4065 | which should be enclosed in REG_LIBCALL/REG_RETVAL notes, | |
4066 | LCT_PURE_MAKE_BLOCK for `purep' calls which should be enclosed in | |
4067 | REG_LIBCALL/REG_RETVAL notes with extra (use (memory (scratch)), | |
4068 | or other LCT_ value for other types of library calls. */ | |
20f7032f | 4069 | |
4070 | void | |
ee582a61 | 4071 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
4072 | enum machine_mode outmode, int nargs, ...) | |
20f7032f | 4073 | { |
ee582a61 | 4074 | va_list p; |
4c9e08a4 | 4075 | |
ee582a61 | 4076 | va_start (p, nargs); |
26dfc457 | 4077 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
ee582a61 | 4078 | va_end (p); |
20f7032f | 4079 | } |
4080 | \f | |
4081 | /* Like emit_library_call except that an extra argument, VALUE, | |
4082 | comes second and says where to store the result. | |
4083 | (If VALUE is zero, this function chooses a convenient way | |
4084 | to return the value. | |
4085 | ||
4086 | This function returns an rtx for where the value is to be found. | |
4087 | If VALUE is nonzero, VALUE is returned. */ | |
4088 | ||
4089 | rtx | |
ee582a61 | 4090 | emit_library_call_value (rtx orgfun, rtx value, |
4091 | enum libcall_type fn_type, | |
4092 | enum machine_mode outmode, int nargs, ...) | |
20f7032f | 4093 | { |
7ad77798 | 4094 | rtx result; |
ee582a61 | 4095 | va_list p; |
4c9e08a4 | 4096 | |
ee582a61 | 4097 | va_start (p, nargs); |
7ad77798 | 4098 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
4099 | nargs, p); | |
ee582a61 | 4100 | va_end (p); |
20f7032f | 4101 | |
7ad77798 | 4102 | return result; |
8ddf1c7e | 4103 | } |
4104 | \f | |
66d433c7 | 4105 | /* Store a single argument for a function call |
4106 | into the register or memory area where it must be passed. | |
4107 | *ARG describes the argument value and where to pass it. | |
4108 | ||
4109 | ARGBLOCK is the address of the stack-block for all the arguments, | |
f9e15121 | 4110 | or 0 on a machine where arguments are pushed individually. |
66d433c7 | 4111 | |
4112 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
c87678e4 | 4113 | so must be careful about how the stack is used. |
66d433c7 | 4114 | |
4115 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4116 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4117 | that we need not worry about saving and restoring the stack. | |
4118 | ||
57679d39 | 4119 | FNDECL is the declaration of the function we are calling. |
c87678e4 | 4120 | |
d10cfa8d | 4121 | Return nonzero if this arg should cause sibcall failure, |
57679d39 | 4122 | zero otherwise. */ |
66d433c7 | 4123 | |
57679d39 | 4124 | static int |
4c9e08a4 | 4125 | store_one_arg (struct arg_data *arg, rtx argblock, int flags, |
4126 | int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
66d433c7 | 4127 | { |
19cb6b50 | 4128 | tree pval = arg->tree_value; |
66d433c7 | 4129 | rtx reg = 0; |
4130 | int partial = 0; | |
4131 | int used = 0; | |
df9f2bb6 | 4132 | int i, lower_bound = 0, upper_bound = 0; |
57679d39 | 4133 | int sibcall_failure = 0; |
66d433c7 | 4134 | |
4135 | if (TREE_CODE (pval) == ERROR_MARK) | |
57679d39 | 4136 | return 1; |
66d433c7 | 4137 | |
1b117c60 | 4138 | /* Push a new temporary level for any temporaries we make for |
4139 | this argument. */ | |
4140 | push_temp_slots (); | |
4141 | ||
02510658 | 4142 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
66d433c7 | 4143 | { |
4448f543 | 4144 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4145 | save any previous data at that location. */ | |
4146 | if (argblock && ! variable_size && arg->stack) | |
4147 | { | |
66d433c7 | 4148 | #ifdef ARGS_GROW_DOWNWARD |
4448f543 | 4149 | /* stack_slot is negative, but we want to index stack_usage_map |
4150 | with positive values. */ | |
4151 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4152 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4153 | else | |
4154 | upper_bound = 0; | |
66d433c7 | 4155 | |
241399f6 | 4156 | lower_bound = upper_bound - arg->locate.size.constant; |
66d433c7 | 4157 | #else |
4448f543 | 4158 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4159 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4160 | else | |
4161 | lower_bound = 0; | |
66d433c7 | 4162 | |
241399f6 | 4163 | upper_bound = lower_bound + arg->locate.size.constant; |
66d433c7 | 4164 | #endif |
4165 | ||
fd2c0c1d | 4166 | i = lower_bound; |
4167 | /* Don't worry about things in the fixed argument area; | |
4168 | it has already been saved. */ | |
4169 | if (i < reg_parm_stack_space) | |
4170 | i = reg_parm_stack_space; | |
4171 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4172 | i++; | |
66d433c7 | 4173 | |
fd2c0c1d | 4174 | if (i < upper_bound) |
66d433c7 | 4175 | { |
241399f6 | 4176 | /* We need to make a save area. */ |
4177 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4178 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4179 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4180 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
4448f543 | 4181 | |
4182 | if (save_mode == BLKmode) | |
4183 | { | |
387bc205 | 4184 | tree ot = TREE_TYPE (arg->tree_value); |
4185 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4186 | | TYPE_QUAL_CONST)); | |
4187 | ||
4188 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
4448f543 | 4189 | preserve_temp_slots (arg->save_area); |
4190 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
0378dbdc | 4191 | expr_size (arg->tree_value), |
4192 | BLOCK_OP_CALL_PARM); | |
4448f543 | 4193 | } |
4194 | else | |
4195 | { | |
4196 | arg->save_area = gen_reg_rtx (save_mode); | |
4197 | emit_move_insn (arg->save_area, stack_area); | |
4198 | } | |
66d433c7 | 4199 | } |
4200 | } | |
4201 | } | |
b3caaea3 | 4202 | |
66d433c7 | 4203 | /* If this isn't going to be placed on both the stack and in registers, |
4204 | set up the register and number of words. */ | |
4205 | if (! arg->pass_on_stack) | |
04d6fcf8 | 4206 | { |
4207 | if (flags & ECF_SIBCALL) | |
4208 | reg = arg->tail_call_reg; | |
4209 | else | |
4210 | reg = arg->reg; | |
4211 | partial = arg->partial; | |
4212 | } | |
66d433c7 | 4213 | |
4214 | if (reg != 0 && partial == 0) | |
4215 | /* Being passed entirely in a register. We shouldn't be called in | |
1e625a2e | 4216 | this case. */ |
66d433c7 | 4217 | abort (); |
4218 | ||
f28c7a75 | 4219 | /* If this arg needs special alignment, don't load the registers |
4220 | here. */ | |
4221 | if (arg->n_aligned_regs != 0) | |
4222 | reg = 0; | |
c87678e4 | 4223 | |
f28c7a75 | 4224 | /* If this is being passed partially in a register, we can't evaluate |
66d433c7 | 4225 | it directly into its stack slot. Otherwise, we can. */ |
4226 | if (arg->value == 0) | |
f848041f | 4227 | { |
f848041f | 4228 | /* stack_arg_under_construction is nonzero if a function argument is |
4229 | being evaluated directly into the outgoing argument list and | |
4230 | expand_call must take special action to preserve the argument list | |
4231 | if it is called recursively. | |
4232 | ||
4233 | For scalar function arguments stack_usage_map is sufficient to | |
4234 | determine which stack slots must be saved and restored. Scalar | |
4235 | arguments in general have pass_on_stack == 0. | |
4236 | ||
4237 | If this argument is initialized by a function which takes the | |
4238 | address of the argument (a C++ constructor or a C function | |
4239 | returning a BLKmode structure), then stack_usage_map is | |
4240 | insufficient and expand_call must push the stack around the | |
4241 | function call. Such arguments have pass_on_stack == 1. | |
4242 | ||
4243 | Note that it is always safe to set stack_arg_under_construction, | |
4244 | but this generates suboptimal code if set when not needed. */ | |
4245 | ||
4246 | if (arg->pass_on_stack) | |
4247 | stack_arg_under_construction++; | |
4448f543 | 4248 | |
7dbf1af4 | 4249 | arg->value = expand_expr (pval, |
4250 | (partial | |
4251 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4252 | ? NULL_RTX : arg->stack, | |
a35a63ff | 4253 | VOIDmode, EXPAND_STACK_PARM); |
1c0c37a5 | 4254 | |
4255 | /* If we are promoting object (or for any other reason) the mode | |
4256 | doesn't agree, convert the mode. */ | |
4257 | ||
1560ef8f | 4258 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4259 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4260 | arg->value, arg->unsignedp); | |
1c0c37a5 | 4261 | |
f848041f | 4262 | if (arg->pass_on_stack) |
4263 | stack_arg_under_construction--; | |
f848041f | 4264 | } |
66d433c7 | 4265 | |
4266 | /* Don't allow anything left on stack from computation | |
4267 | of argument to alloca. */ | |
02510658 | 4268 | if (flags & ECF_MAY_BE_ALLOCA) |
66d433c7 | 4269 | do_pending_stack_adjust (); |
4270 | ||
4271 | if (arg->value == arg->stack) | |
8a06f2d4 | 4272 | /* If the value is already in the stack slot, we are done. */ |
4273 | ; | |
1c0c37a5 | 4274 | else if (arg->mode != BLKmode) |
66d433c7 | 4275 | { |
19cb6b50 | 4276 | int size; |
66d433c7 | 4277 | |
4278 | /* Argument is a scalar, not entirely passed in registers. | |
4279 | (If part is passed in registers, arg->partial says how much | |
4280 | and emit_push_insn will take care of putting it there.) | |
c87678e4 | 4281 | |
66d433c7 | 4282 | Push it, and if its size is less than the |
4283 | amount of space allocated to it, | |
4284 | also bump stack pointer by the additional space. | |
4285 | Note that in C the default argument promotions | |
4286 | will prevent such mismatches. */ | |
4287 | ||
1c0c37a5 | 4288 | size = GET_MODE_SIZE (arg->mode); |
66d433c7 | 4289 | /* Compute how much space the push instruction will push. |
4290 | On many machines, pushing a byte will advance the stack | |
4291 | pointer by a halfword. */ | |
4292 | #ifdef PUSH_ROUNDING | |
4293 | size = PUSH_ROUNDING (size); | |
4294 | #endif | |
4295 | used = size; | |
4296 | ||
4297 | /* Compute how much space the argument should get: | |
4298 | round up to a multiple of the alignment for arguments. */ | |
1c0c37a5 | 4299 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
66d433c7 | 4300 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4301 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4302 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4303 | ||
4304 | /* This isn't already where we want it on the stack, so put it there. | |
4305 | This can either be done with push or copy insns. */ | |
4c9e08a4 | 4306 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
0378dbdc | 4307 | PARM_BOUNDARY, partial, reg, used - size, argblock, |
241399f6 | 4308 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4309 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
d5c9a99f | 4310 | |
4311 | /* Unless this is a partially-in-register argument, the argument is now | |
4312 | in the stack. */ | |
4313 | if (partial == 0) | |
4314 | arg->value = arg->stack; | |
66d433c7 | 4315 | } |
4316 | else | |
4317 | { | |
4318 | /* BLKmode, at least partly to be pushed. */ | |
4319 | ||
cf78c9ff | 4320 | unsigned int parm_align; |
19cb6b50 | 4321 | int excess; |
66d433c7 | 4322 | rtx size_rtx; |
4323 | ||
4324 | /* Pushing a nonscalar. | |
4325 | If part is passed in registers, PARTIAL says how much | |
4326 | and emit_push_insn will take care of putting it there. */ | |
4327 | ||
4328 | /* Round its size up to a multiple | |
4329 | of the allocation unit for arguments. */ | |
4330 | ||
241399f6 | 4331 | if (arg->locate.size.var != 0) |
66d433c7 | 4332 | { |
4333 | excess = 0; | |
241399f6 | 4334 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
66d433c7 | 4335 | } |
4336 | else | |
4337 | { | |
66d433c7 | 4338 | /* PUSH_ROUNDING has no effect on us, because |
4339 | emit_push_insn for BLKmode is careful to avoid it. */ | |
a2509aaa | 4340 | if (reg && GET_CODE (reg) == PARALLEL) |
4341 | { | |
4342 | /* Use the size of the elt to compute excess. */ | |
4343 | rtx elt = XEXP (XVECEXP (reg, 0, 0), 0); | |
4344 | excess = (arg->locate.size.constant | |
4345 | - int_size_in_bytes (TREE_TYPE (pval)) | |
4346 | + partial * GET_MODE_SIZE (GET_MODE (elt))); | |
4347 | } | |
4348 | else | |
4349 | excess = (arg->locate.size.constant | |
4350 | - int_size_in_bytes (TREE_TYPE (pval)) | |
4351 | + partial * UNITS_PER_WORD); | |
623282b0 | 4352 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
4353 | NULL_RTX, TYPE_MODE (sizetype), 0); | |
66d433c7 | 4354 | } |
4355 | ||
cf78c9ff | 4356 | /* Some types will require stricter alignment, which will be |
4357 | provided for elsewhere in argument layout. */ | |
4358 | parm_align = MAX (PARM_BOUNDARY, TYPE_ALIGN (TREE_TYPE (pval))); | |
4359 | ||
4360 | /* When an argument is padded down, the block is aligned to | |
4361 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4362 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4363 | { | |
241399f6 | 4364 | if (arg->locate.size.var) |
cf78c9ff | 4365 | parm_align = BITS_PER_UNIT; |
4366 | else if (excess) | |
4367 | { | |
28397255 | 4368 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
cf78c9ff | 4369 | parm_align = MIN (parm_align, excess_align); |
4370 | } | |
4371 | } | |
4372 | ||
e16ceb8e | 4373 | if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) |
57679d39 | 4374 | { |
4375 | /* emit_push_insn might not work properly if arg->value and | |
241399f6 | 4376 | argblock + arg->locate.offset areas overlap. */ |
57679d39 | 4377 | rtx x = arg->value; |
4378 | int i = 0; | |
4379 | ||
4380 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4381 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4382 | && XEXP (XEXP (x, 0), 0) == | |
4383 | current_function_internal_arg_pointer | |
4384 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4385 | { | |
4386 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4387 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4388 | ||
21dda4ee | 4389 | /* expand_call should ensure this. */ |
241399f6 | 4390 | if (arg->locate.offset.var || GET_CODE (size_rtx) != CONST_INT) |
57679d39 | 4391 | abort (); |
4392 | ||
241399f6 | 4393 | if (arg->locate.offset.constant > i) |
57679d39 | 4394 | { |
241399f6 | 4395 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
57679d39 | 4396 | sibcall_failure = 1; |
4397 | } | |
241399f6 | 4398 | else if (arg->locate.offset.constant < i) |
57679d39 | 4399 | { |
241399f6 | 4400 | if (i < arg->locate.offset.constant + INTVAL (size_rtx)) |
57679d39 | 4401 | sibcall_failure = 1; |
4402 | } | |
4403 | } | |
4404 | } | |
4405 | ||
1c0c37a5 | 4406 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
cf78c9ff | 4407 | parm_align, partial, reg, excess, argblock, |
241399f6 | 4408 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4409 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
66d433c7 | 4410 | |
d5c9a99f | 4411 | /* Unless this is a partially-in-register argument, the argument is now |
4412 | in the stack. | |
66d433c7 | 4413 | |
d5c9a99f | 4414 | ??? Unlike the case above, in which we want the actual |
4415 | address of the data, so that we can load it directly into a | |
4416 | register, here we want the address of the stack slot, so that | |
4417 | it's properly aligned for word-by-word copying or something | |
4418 | like that. It's not clear that this is always correct. */ | |
4419 | if (partial == 0) | |
4420 | arg->value = arg->stack_slot; | |
4421 | } | |
66d433c7 | 4422 | |
a35a63ff | 4423 | /* Mark all slots this store used. */ |
4424 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4425 | && argblock && ! variable_size && arg->stack) | |
4426 | for (i = lower_bound; i < upper_bound; i++) | |
4427 | stack_usage_map[i] = 1; | |
4428 | ||
66d433c7 | 4429 | /* Once we have pushed something, pops can't safely |
4430 | be deferred during the rest of the arguments. */ | |
4431 | NO_DEFER_POP; | |
4432 | ||
4433 | /* ANSI doesn't require a sequence point here, | |
4434 | but PCC has one, so this will avoid some problems. */ | |
4435 | emit_queue (); | |
4436 | ||
148b08de | 4437 | /* Free any temporary slots made in processing this argument. Show |
4438 | that we might have taken the address of something and pushed that | |
4439 | as an operand. */ | |
4440 | preserve_temp_slots (NULL_RTX); | |
66d433c7 | 4441 | free_temp_slots (); |
1b117c60 | 4442 | pop_temp_slots (); |
57679d39 | 4443 | |
4444 | return sibcall_failure; | |
66d433c7 | 4445 | } |
890f0c17 | 4446 | |
890f0c17 | 4447 | /* Nonzero if we do not know how to pass TYPE solely in registers. |
4448 | We cannot do so in the following cases: | |
4449 | ||
4450 | - if the type has variable size | |
4451 | - if the type is marked as addressable (it is required to be constructed | |
4452 | into the stack) | |
4453 | - if the padding and mode of the type is such that a copy into a register | |
4454 | would put it into the wrong part of the register. | |
4455 | ||
4456 | Which padding can't be supported depends on the byte endianness. | |
4457 | ||
4458 | A value in a register is implicitly padded at the most significant end. | |
4459 | On a big-endian machine, that is the lower end in memory. | |
4460 | So a value padded in memory at the upper end can't go in a register. | |
4461 | For a little-endian machine, the reverse is true. */ | |
4462 | ||
4463 | bool | |
4c9e08a4 | 4464 | default_must_pass_in_stack (enum machine_mode mode, tree type) |
890f0c17 | 4465 | { |
4466 | if (!type) | |
dceaa0b1 | 4467 | return false; |
890f0c17 | 4468 | |
4469 | /* If the type has variable size... */ | |
4470 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4471 | return true; | |
4472 | ||
4473 | /* If the type is marked as addressable (it is required | |
4474 | to be constructed into the stack)... */ | |
4475 | if (TREE_ADDRESSABLE (type)) | |
4476 | return true; | |
4477 | ||
4478 | /* If the padding and mode of the type is such that a copy into | |
4479 | a register would put it into the wrong part of the register. */ | |
4480 | if (mode == BLKmode | |
4481 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4482 | && (FUNCTION_ARG_PADDING (mode, type) | |
4483 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4484 | return true; | |
4485 | ||
4486 | return false; | |
4487 | } |