Mercurial > hg > CbC > CbC_gcc
annotate gcc/cbc-goto.h @ 50:4e0a8e84ee55
Added tag cbc-4.4.3 for changeset 2e19f845ea37
| author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Sun, 07 Feb 2010 17:56:48 +0900 |
| parents | 2476ed92181e |
| children | 3aaf117db171 |
| rev | line source |
|---|---|
| 3 | 1 |
| 2 static void | |
| 3 preexpand_argument_expr (struct arg_data *, int); | |
| 4 | |
| 5 static void | |
| 6 determine_order(int *, int); | |
| 7 | |
| 8 static int | |
| 9 expand_one_arg_push (struct arg_data *, rtx, int, int, int); | |
| 10 | |
| 11 static void | |
| 12 push_overlaps(struct arg_data *, int); | |
| 13 | |
| 14 static int | |
| 15 check_frame_offset(rtx); | |
| 16 | |
| 17 | |
| 18 static rtx | |
| 19 expand_cbc_goto (tree exp, rtx target, tree fndecl, tree funtype, tree fntype, | |
| 20 tree addr, | |
| 21 int ignore, | |
| 22 int flags, | |
| 23 int num_actuals, | |
| 24 struct arg_data *args, | |
| 25 struct args_size *args_size, | |
| 26 CUMULATIVE_ARGS args_so_far, | |
| 27 rtx old_stack_level, | |
| 28 int reg_parm_stack_space, | |
| 29 int old_pending_adj, | |
| 30 unsigned HOST_WIDE_INT preferred_stack_boundary, | |
| 31 unsigned HOST_WIDE_INT preferred_unit_stack_boundary, | |
| 32 rtx structure_value_addr, | |
| 33 //int structure_value_addr_parm, | |
| 34 int old_inhibit_defer_pop | |
| 35 ) | |
| 36 { | |
| 37 | |
| 38 /* folowing variables is just copied from expand_call. */ | |
| 39 | |
| 40 int pass = 0; | |
| 41 int i; | |
| 42 #ifdef REG_PARM_STACK_SPACE | |
| 43 /* Define the boundary of the register parm stack space that needs to be | |
| 44 saved, if any. */ | |
| 45 #endif | |
| 46 rtx funexp; | |
| 47 rtx valreg; | |
| 48 struct args_size adjusted_args_size; | |
| 49 int unadjusted_args_size; | |
| 50 int reg_parm_seen; | |
| 51 rtx static_chain_value; | |
| 52 int old_stack_allocated; | |
| 53 int old_stack_pointer_delta = 0; | |
| 54 int old_stack_arg_under_construction = 0; | |
| 55 rtx call_fusage; | |
| 56 char *stack_usage_map_buf = NULL; | |
| 57 rtx argblock = 0; | |
| 58 HOST_WIDE_INT struct_value_size = 0; | |
| 59 int pcc_struct_value = 0; | |
| 60 int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
| 61 char *initial_stack_usage_map = stack_usage_map; | |
| 62 rtx tail_call_insns = NULL_RTX; | |
| 63 | |
| 64 | |
| 65 int *store_order; | |
| 66 | |
| 67 | |
| 68 int sibcall_failure = 0; | |
| 69 /* We want to emit any pending stack adjustments before the tail | |
| 70 recursion "call". That way we know any adjustment after the tail | |
| 71 recursion call can be ignored if we indeed use the tail | |
| 72 call expansion. */ | |
| 73 int save_pending_stack_adjust = 0; | |
| 74 int save_stack_pointer_delta = 0; | |
| 75 rtx insns; | |
| 76 rtx before_call, next_arg_reg; | |
| 77 | |
| 78 /* State variables we need to save and restore between | |
| 79 iterations. */ | |
| 80 save_pending_stack_adjust = pending_stack_adjust; | |
| 81 save_stack_pointer_delta = stack_pointer_delta; | |
| 82 flags |= ECF_SIBCALL; | |
| 83 | |
| 84 /* Other state variables that we must reinitialize each time | |
| 85 through the loop (that are not initialized by the loop itself). */ | |
| 86 argblock = 0; | |
| 87 call_fusage = 0; | |
| 88 | |
| 89 /* Start a new sequence for the normal call case. | |
| 90 | |
| 91 From this point on, if the sibling call fails, we want to set | |
| 92 sibcall_failure instead of continuing the loop. */ | |
| 93 start_sequence (); | |
| 94 | |
| 95 /* Don't let pending stack adjusts add up to too much. | |
| 96 Also, do all pending adjustments now if there is any chance | |
| 97 this might be a call to alloca or if we are expanding a sibling | |
| 98 call sequence or if we are calling a function that is to return | |
| 99 with stack pointer depressed. | |
| 100 Also do the adjustments before a throwing call, otherwise | |
| 101 exception handling can fail; PR 19225. */ | |
| 102 if (pending_stack_adjust >= 32 | |
| 103 || (pending_stack_adjust > 0 | |
| 104 && (flags & ECF_MAY_BE_ALLOCA)) | |
| 105 || (pending_stack_adjust > 0 | |
| 106 && flag_exceptions && !(flags & ECF_NOTHROW)) | |
| 107 || pass == 0) | |
| 108 do_pending_stack_adjust (); | |
| 109 | |
| 110 | |
| 111 if (pass == 0 && crtl->stack_protect_guard) | |
| 112 stack_protect_epilogue (); | |
| 113 | |
| 114 adjusted_args_size = *args_size; | |
| 115 /* Compute the actual size of the argument block required. The variable | |
| 116 and constant sizes must be combined, the size may have to be rounded, | |
| 117 and there may be a minimum required size. When generating a sibcall | |
| 118 pattern, do not round up, since we'll be re-using whatever space our | |
| 119 caller provided. */ | |
| 120 unadjusted_args_size | |
| 121 = compute_argument_block_size (reg_parm_stack_space, | |
| 122 &adjusted_args_size, | |
| 123 fndecl, fntype, | |
| 124 (pass == 0 ? 0 | |
| 125 : preferred_stack_boundary)); | |
| 126 | |
| 127 old_stack_allocated = stack_pointer_delta - pending_stack_adjust; | |
| 128 | |
| 129 argblock = crtl->args.internal_arg_pointer; | |
| 130 | |
| 131 argblock | |
| 132 #ifdef STACK_GROWS_DOWNWARD | |
| 133 = plus_constant (argblock, crtl->args.pretend_args_size); | |
| 134 #else | |
| 135 = plus_constant (argblock, -crtl->args.pretend_args_size); | |
| 136 #endif | |
| 137 | |
| 138 | |
| 139 stored_args_map = sbitmap_alloc (args_size->constant); | |
| 140 sbitmap_zero (stored_args_map); | |
| 141 | |
| 142 | |
| 143 if (ACCUMULATE_OUTGOING_ARGS) | |
| 144 { | |
| 145 /* The save/restore code in store_one_arg handles all | |
| 146 cases except one: a constructor call (including a C | |
| 147 function returning a BLKmode struct) to initialize | |
| 148 an argument. */ | |
| 149 if (stack_arg_under_construction) | |
| 150 { | |
| 151 rtx push_size | |
| 152 = GEN_INT (adjusted_args_size.constant | |
| 153 + (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype | |
| 154 : TREE_TYPE (fndecl))) ? 0 | |
| 155 : reg_parm_stack_space)); | |
| 156 if (old_stack_level == 0) | |
| 157 { | |
| 158 emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
| 159 NULL_RTX); | |
| 160 old_stack_pointer_delta = stack_pointer_delta; | |
| 161 old_pending_adj = pending_stack_adjust; | |
| 162 pending_stack_adjust = 0; | |
| 163 /* stack_arg_under_construction says whether a stack | |
| 164 arg is being constructed at the old stack level. | |
| 165 Pushing the stack gets a clean outgoing argument | |
| 166 block. */ | |
| 167 old_stack_arg_under_construction | |
| 168 = stack_arg_under_construction; | |
| 169 stack_arg_under_construction = 0; | |
| 170 /* Make a new map for the new argument list. */ | |
| 171 if (stack_usage_map_buf) | |
| 172 free (stack_usage_map_buf); | |
| 173 stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); | |
| 174 stack_usage_map = stack_usage_map_buf; | |
| 175 memset (stack_usage_map, 0, highest_outgoing_arg_in_use); | |
| 176 highest_outgoing_arg_in_use = 0; | |
| 177 } | |
| 178 allocate_dynamic_stack_space (push_size, NULL_RTX, | |
| 179 BITS_PER_UNIT); | |
| 180 } | |
| 181 | |
| 182 /* If argument evaluation might modify the stack pointer, | |
| 183 copy the address of the argument list to a register. */ | |
| 184 for (i = 0; i < num_actuals; i++) | |
| 185 if (args[i].pass_on_stack) | |
| 186 { | |
| 187 argblock = copy_addr_to_reg (argblock); | |
| 188 break; | |
| 189 } | |
| 190 } | |
| 191 | |
| 192 compute_argument_addresses (args, argblock, num_actuals); | |
| 193 | |
| 194 /* in the case that | |
| 195 a function goto codesegment. | |
| 196 adjust stack space. */ | |
| 197 if ( !CbC_IS_CODE_SEGMENT(TREE_TYPE(current_function_decl)) ) | |
| 198 //if ( !(current_function_decl&&CbC_IS_CODE_SEGMENT(current_function_decl)) ) | |
| 199 { | |
| 200 HOST_WIDE_INT padding; | |
| 21 | 201 padding = CbC_PRETENDED_STACK_SIZE - |
| 3 | 202 (crtl->args.size - crtl->args.pretend_args_size); |
| 203 if (0&&padding > 0) | |
| 204 anti_adjust_stack (GEN_INT (padding)); | |
| 205 } | |
| 206 | |
| 207 /* Now that the stack is properly aligned, pops can't safely | |
| 208 be deferred during the evaluation of the arguments. */ | |
| 209 NO_DEFER_POP; | |
| 210 | |
| 211 funexp = rtx_for_function_call (fndecl, addr); | |
| 212 | |
| 213 /* Figure out the register where the value, if any, will come back. */ | |
| 214 valreg = 0; | |
| 215 | |
| 216 | |
| 217 /* Precompute all register parameters. It isn't safe to compute anything | |
| 218 once we have started filling any specific hard regs. */ | |
| 219 precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
| 220 | |
|
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221 if (CALL_EXPR_STATIC_CHAIN (exp)) |
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222 static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp)); |
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223 else |
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224 static_chain_value = 0; |
| 3 | 225 |
| 226 | |
| 227 /* parallel assignment */ | |
| 228 store_order = alloca (num_actuals * sizeof (int)); | |
| 229 memset (store_order, 0, num_actuals * sizeof (int)); | |
| 230 | |
| 231 /* fill the arg[i]->exprs. */ | |
| 232 for (i = 0; i < num_actuals; i++) | |
| 233 { | |
| 234 if (args[i].reg == 0 || args[i].pass_on_stack) | |
| 235 { | |
| 236 preexpand_argument_expr (&args[i], | |
| 237 adjusted_args_size.var != 0); | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 | |
| 242 /* push overlapped argument to stack. */ | |
| 243 push_overlaps(args, num_actuals); | |
| 244 | |
| 245 /* determine ordering to store arguments. | |
| 246 and generate RTL that store some variable temporary, if it needed.*/ | |
| 247 /* now... this function do nothing. */ | |
| 248 determine_order(store_order, num_actuals); | |
| 249 | |
| 250 /* push arguments in the order . */ | |
| 251 for (i = 0; i < num_actuals; i++) | |
| 252 { | |
| 253 if (args[store_order[i]].reg == 0 | |
| 254 || args[store_order[i]].pass_on_stack | |
| 255 || args[store_order[i]].partial!=0 ) | |
| 256 { | |
| 257 expand_one_arg_push (&args[store_order[i]], argblock, flags, | |
| 258 adjusted_args_size.var != 0, | |
| 259 reg_parm_stack_space); | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 | |
| 264 /* If register arguments require space on the stack and stack space | |
| 265 was not preallocated, allocate stack space here for arguments | |
| 266 passed in registers. */ | |
| 267 #ifdef OUTGOING_REG_PARM_STACK_SPACE | |
| 268 //if (!ACCUMULATE_OUTGOING_ARGS | |
| 269 //&& must_preallocate == 0 && reg_parm_stack_space > 0) | |
| 270 //anti_adjust_stack (GEN_INT (reg_parm_stack_space)); | |
| 271 #endif | |
| 272 | |
| 273 /* */ | |
| 274 funexp = prepare_call_address (funexp, static_chain_value, | |
| 275 &call_fusage, reg_parm_seen, pass == 0); | |
| 276 | |
| 277 /* store args into register. */ | |
| 278 load_register_parameters (args, num_actuals, &call_fusage, flags, | |
| 279 //pass == 0, &sibcall_failure); | |
| 280 0, NULL); | |
| 281 | |
| 282 /* Save a pointer to the last insn before the call, so that we can | |
| 283 later safely search backwards to find the CALL_INSN. */ | |
| 284 before_call = get_last_insn (); | |
| 285 | |
| 286 /* Set up next argument register. For sibling calls on machines | |
| 287 with register windows this should be the incoming register. */ | |
| 288 #ifdef FUNCTION_INCOMING_ARG | |
| 289 if (pass == 0) | |
| 290 next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
| 291 void_type_node, 1); | |
| 292 else | |
| 293 #endif | |
| 294 next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
| 295 void_type_node, 1); | |
| 296 | |
| 297 /* All arguments and registers used for the call must be set up by | |
| 298 now! */ | |
| 299 | |
| 300 /* Stack must be properly aligned now. */ | |
| 301 gcc_assert (!pass | |
| 302 || !(stack_pointer_delta % preferred_unit_stack_boundary)); | |
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303 #if 0 |
| 3 | 304 /* store environment. */ |
| 305 if ( env_tree!=NULL ) | |
| 306 { | |
| 307 emit_insn (gen_rtx_CLOBBER (VOIDmode, | |
| 308 gen_rtx_MEM (BLKmode, | |
| 309 hard_frame_pointer_rtx))); | |
| 310 emit_move_insn (hard_frame_pointer_rtx, env_rtx); | |
| 311 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx)); | |
| 312 //pop_temp_slots (); | |
| 313 | |
| 314 emit_indirect_jump (funexp); | |
| 315 } | |
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316 #endif |
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317 if (GET_CODE (funexp) != SYMBOL_REF) |
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318 { |
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319 push_temp_slots(); |
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320 preserve_temp_slots(funexp); |
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321 /* Generate the actual call instruction. */ |
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322 emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, |
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323 adjusted_args_size.constant, struct_value_size, |
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324 //next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
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325 next_arg_reg, valreg, 0, call_fusage, |
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326 flags, & args_so_far); |
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327 pop_temp_slots(); |
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328 } |
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329 else |
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330 { |
| 3 | 331 |
| 332 /* Generate the actual call instruction. */ | |
| 333 emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, | |
| 334 adjusted_args_size.constant, struct_value_size, | |
| 335 //next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, | |
| 336 next_arg_reg, valreg, 0, call_fusage, | |
| 337 flags, & args_so_far); | |
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parents:
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338 } |
| 3 | 339 |
| 340 /* If a non-BLKmode value is returned at the most significant end | |
| 341 of a register, shift the register right by the appropriate amount | |
| 342 and update VALREG accordingly. BLKmode values are handled by the | |
| 343 group load/store machinery below. */ | |
| 344 if (!structure_value_addr | |
| 345 && !pcc_struct_value | |
| 346 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
| 347 && targetm.calls.return_in_msb (TREE_TYPE (exp))) | |
| 348 { | |
| 349 if (shift_return_value (TYPE_MODE (TREE_TYPE (exp)), false, valreg)) | |
| 350 sibcall_failure = 1; | |
| 351 valreg = gen_rtx_REG (TYPE_MODE (TREE_TYPE (exp)), REGNO (valreg)); | |
| 352 } | |
| 353 | |
| 354 | |
| 355 /* For calls to `setjmp', etc., inform flow.c it should complain | |
| 356 if nonvolatile values are live. For functions that cannot return, | |
| 357 inform flow that control does not fall through. */ | |
| 358 | |
| 359 if ((flags & ECF_NORETURN) || pass == 0) | |
| 360 { | |
| 361 /* The barrier must be emitted | |
| 362 immediately after the CALL_INSN. Some ports emit more | |
| 363 than just a CALL_INSN above, so we must search for it here. */ | |
| 364 | |
| 365 rtx last = get_last_insn (); | |
| 366 while (!CALL_P (last)) | |
| 367 { | |
| 368 last = PREV_INSN (last); | |
| 369 /* There was no CALL_INSN? */ | |
| 370 gcc_assert (last != before_call); | |
| 371 } | |
| 372 | |
| 373 emit_barrier_after (last); | |
| 374 | |
| 375 /* Stack adjustments after a noreturn call are dead code. | |
| 376 However when NO_DEFER_POP is in effect, we must preserve | |
| 377 stack_pointer_delta. */ | |
| 378 if (inhibit_defer_pop == 0) | |
| 379 { | |
| 380 stack_pointer_delta = old_stack_allocated; | |
| 381 pending_stack_adjust = 0; | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 /* If value type not void, return an rtx for the value. */ | |
| 386 | |
| 387 if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode | |
| 388 || ignore) | |
| 389 target = const0_rtx; | |
| 390 | |
| 391 if (targetm.calls.promote_function_return(funtype)) | |
| 392 { | |
| 393 /* If we promoted this return value, make the proper SUBREG. | |
| 394 TARGET might be const0_rtx here, so be careful. */ | |
| 395 if (REG_P (target) | |
| 396 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
| 397 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
| 398 { | |
| 399 tree type = TREE_TYPE (exp); | |
| 400 int unsignedp = TYPE_UNSIGNED (type); | |
| 401 int offset = 0; | |
| 402 enum machine_mode pmode; | |
| 403 | |
| 404 pmode = promote_mode (type, TYPE_MODE (type), &unsignedp, 1); | |
| 405 /* If we don't promote as expected, something is wrong. */ | |
| 406 gcc_assert (GET_MODE (target) == pmode); | |
| 407 | |
| 408 if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) | |
| 409 && (GET_MODE_SIZE (GET_MODE (target)) | |
| 410 > GET_MODE_SIZE (TYPE_MODE (type)))) | |
| 411 { | |
| 412 offset = GET_MODE_SIZE (GET_MODE (target)) | |
| 413 - GET_MODE_SIZE (TYPE_MODE (type)); | |
| 414 if (! BYTES_BIG_ENDIAN) | |
| 415 offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
| 416 else if (! WORDS_BIG_ENDIAN) | |
| 417 offset %= UNITS_PER_WORD; | |
| 418 } | |
| 419 target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
| 420 SUBREG_PROMOTED_VAR_P (target) = 1; | |
| 421 SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); | |
| 422 } | |
| 423 } | |
| 424 | |
| 425 /* If size of args is variable or this was a constructor call for a stack | |
| 426 argument, restore saved stack-pointer value. */ | |
| 427 | |
| 428 if (old_stack_level) | |
| 429 { | |
| 430 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
| 431 stack_pointer_delta = old_stack_pointer_delta; | |
| 432 pending_stack_adjust = old_pending_adj; | |
| 433 old_stack_allocated = stack_pointer_delta - pending_stack_adjust; | |
| 434 stack_arg_under_construction = old_stack_arg_under_construction; | |
| 435 highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
| 436 stack_usage_map = initial_stack_usage_map; | |
| 437 } | |
| 438 | |
| 439 /* If this was alloca, record the new stack level for nonlocal gotos. | |
| 440 Check for the handler slots since we might not have a save area | |
| 441 for non-local gotos. */ | |
| 442 | |
| 443 if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) | |
| 444 update_nonlocal_goto_save_area (); | |
| 445 | |
| 446 /* Free up storage we no longer need. */ | |
| 447 for (i = 0; i < num_actuals; ++i) | |
| 448 if (args[i].aligned_regs) | |
| 449 free (args[i].aligned_regs); | |
| 450 | |
| 451 insns = get_insns (); | |
| 452 end_sequence (); | |
| 453 | |
| 454 tail_call_insns = insns; | |
| 455 | |
| 456 /* Restore the pending stack adjustment now that we have | |
| 457 finished generating the sibling call sequence. */ | |
| 458 | |
| 459 pending_stack_adjust = save_pending_stack_adjust; | |
| 460 stack_pointer_delta = save_stack_pointer_delta; | |
| 461 | |
| 462 /* Prepare arg structure for next iteration. */ | |
| 463 for (i = 0; i < num_actuals; i++) | |
| 464 { | |
| 465 args[i].value = 0; | |
| 466 args[i].aligned_regs = 0; | |
| 467 args[i].stack = 0; | |
| 468 } | |
| 469 | |
| 470 sbitmap_free (stored_args_map); | |
| 471 | |
| 472 | |
| 473 emit_insn(tail_call_insns); | |
| 474 crtl->tail_call_emit = true; | |
| 475 | |
| 476 return target; | |
| 477 } | |
| 478 | |
| 479 | |
| 480 static void | |
| 481 preexpand_argument_expr (struct arg_data *arg, | |
| 482 int variable_size ATTRIBUTE_UNUSED) | |
| 483 { | |
| 484 tree pval = arg->tree_value; | |
| 485 rtx reg = 0; | |
| 486 int partial = 0; | |
| 487 | |
| 488 if (TREE_CODE (pval) == ERROR_MARK) | |
| 489 return; | |
| 490 | |
| 491 /* Push a new temporary level for any temporaries we make for | |
| 492 this argument. */ | |
| 493 push_temp_slots (); | |
| 494 | |
| 495 | |
| 496 /* If this isn't going to be placed on both the stack and in registers, | |
| 497 set up the register and number of words. */ | |
| 498 if (! arg->pass_on_stack) | |
| 499 { | |
| 500 //if (flags & ECF_SIBCALL) | |
| 501 reg = arg->tail_call_reg; | |
| 502 //else | |
| 503 //reg = arg->reg; | |
| 504 partial = arg->partial; | |
| 505 } | |
| 506 | |
| 507 /* Being passed entirely in a register. We shouldn't be called in | |
| 508 this case. */ | |
| 509 gcc_assert (reg == 0 || partial != 0); | |
| 510 | |
| 511 /* If this arg needs special alignment, don't load the registers | |
| 512 here. */ | |
| 513 if (arg->n_aligned_regs != 0) | |
| 514 reg = 0; | |
| 515 | |
| 516 /* Start a new sequence for the arg->exprs. */ | |
| 517 start_sequence (); | |
| 518 | |
| 519 | |
| 520 if (arg->pass_on_stack) | |
| 521 stack_arg_under_construction++; | |
| 522 | |
| 523 arg->value = expand_expr (pval, | |
| 524 (partial | |
| 525 || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
| 526 ? NULL_RTX : arg->stack, | |
| 527 VOIDmode, EXPAND_STACK_PARM); | |
| 528 | |
| 529 /* If we are promoting object (or for any other reason) the mode | |
| 530 doesn't agree, convert the mode. */ | |
| 531 | |
| 532 if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) | |
| 533 arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
| 534 arg->value, arg->unsignedp); | |
| 535 | |
| 536 if (arg->pass_on_stack) | |
| 537 stack_arg_under_construction--; | |
| 538 | |
| 539 arg->exprs = get_insns (); | |
| 540 end_sequence (); | |
| 541 | |
| 542 if (arg->exprs) emit_insn(arg->exprs); | |
| 543 | |
| 544 preserve_temp_slots (arg->value); | |
| 545 pop_temp_slots (); | |
| 546 | |
| 547 return ; | |
| 548 } | |
| 549 | |
| 550 static int | |
| 551 expand_one_arg_push (struct arg_data *arg, rtx argblock, int flags, | |
| 552 int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
| 553 { | |
| 554 tree pval = arg->tree_value; | |
| 555 int used = 0; | |
| 556 int i, lower_bound = 0, upper_bound = 0; | |
| 557 rtx reg = 0; | |
| 558 int partial = 0; | |
| 559 | |
| 560 /* Push a new temporary level for any temporaries we make for | |
| 561 this argument. */ | |
| 562 push_temp_slots (); | |
| 563 | |
| 564 | |
| 565 /* copy from store_one_arg. modify here after.*/ | |
| 566 /* If this isn't going to be placed on both the stack and in registers, | |
| 567 set up the register and number of words. */ | |
| 568 if (! arg->pass_on_stack) | |
| 569 { | |
| 570 //if (flags & ECF_SIBCALL) | |
| 571 reg = arg->tail_call_reg; | |
| 572 //else | |
| 573 //reg = arg->reg; | |
| 574 partial = arg->partial; | |
| 575 } | |
| 576 /* Being passed entirely in a register. We shouldn't be called in | |
| 577 this case. */ | |
| 578 gcc_assert (reg == 0 || partial != 0); | |
| 579 /* If this arg needs special alignment, don't load the registers | |
| 580 here. */ | |
| 581 if (arg->n_aligned_regs != 0) | |
| 582 reg = 0; | |
| 583 | |
| 584 | |
| 585 | |
| 586 | |
| 587 if (arg->value == arg->stack) | |
| 588 /* If the value is already in the stack slot, we are done. */ | |
| 589 ; | |
| 590 else if (arg->mode != BLKmode) | |
| 591 { | |
| 592 int size; | |
| 593 | |
| 594 /* Argument is a scalar, not entirely passed in registers. | |
| 595 (If part is passed in registers, arg->partial says how much | |
| 596 and emit_push_insn will take care of putting it there.) | |
| 597 | |
| 598 Push it, and if its size is less than the | |
| 599 amount of space allocated to it, | |
| 600 also bump stack pointer by the additional space. | |
| 601 Note that in C the default argument promotions | |
| 602 will prevent such mismatches. */ | |
| 603 | |
| 604 size = GET_MODE_SIZE (arg->mode); | |
| 605 /* Compute how much space the push instruction will push. | |
| 606 On many machines, pushing a byte will advance the stack | |
| 607 pointer by a halfword. */ | |
| 608 #ifdef PUSH_ROUNDING | |
| 609 size = PUSH_ROUNDING (size); | |
| 610 #endif | |
| 611 used = size; | |
| 612 | |
| 613 /* Compute how much space the argument should get: | |
| 614 round up to a multiple of the alignment for arguments. */ | |
| 615 if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) | |
| 616 used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) | |
| 617 / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
| 618 * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
| 619 | |
| 620 /* This isn't already where we want it on the stack, so put it there. | |
| 621 This can either be done with push or copy insns. */ | |
| 622 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, | |
| 623 PARM_BOUNDARY, partial, reg, used - size, argblock, | |
| 624 ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, | |
| 625 ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
| 626 | |
| 627 /* Unless this is a partially-in-register argument, the argument is now | |
| 628 in the stack. */ | |
| 629 if (partial == 0) | |
| 630 arg->value = arg->stack; | |
| 631 } | |
| 632 else | |
| 633 { | |
| 634 /* BLKmode, at least partly to be pushed. */ | |
| 635 | |
| 636 unsigned int parm_align; | |
| 637 int excess; | |
| 638 rtx size_rtx; | |
| 639 | |
| 640 /* Pushing a nonscalar. | |
| 641 If part is passed in registers, PARTIAL says how much | |
| 642 and emit_push_insn will take care of putting it there. */ | |
| 643 | |
| 644 /* Round its size up to a multiple | |
| 645 of the allocation unit for arguments. */ | |
| 646 | |
| 647 if (arg->locate.size.var != 0) | |
| 648 { | |
| 649 excess = 0; | |
| 650 size_rtx = ARGS_SIZE_RTX (arg->locate.size); | |
| 651 } | |
| 652 else | |
| 653 { | |
| 654 /* PUSH_ROUNDING has no effect on us, because emit_push_insn | |
| 655 for BLKmode is careful to avoid it. */ | |
| 656 excess = (arg->locate.size.constant | |
| 657 - int_size_in_bytes (TREE_TYPE (pval)) | |
| 658 + partial); | |
| 659 size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), | |
| 660 NULL_RTX, TYPE_MODE (sizetype), 0); | |
| 661 } | |
| 662 | |
| 663 parm_align = arg->locate.boundary; | |
| 664 | |
| 665 /* When an argument is padded down, the block is aligned to | |
| 666 PARM_BOUNDARY, but the actual argument isn't. */ | |
| 667 if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
| 668 { | |
| 669 if (arg->locate.size.var) | |
| 670 parm_align = BITS_PER_UNIT; | |
| 671 else if (excess) | |
| 672 { | |
| 673 unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; | |
| 674 parm_align = MIN (parm_align, excess_align); | |
| 675 } | |
| 676 } | |
| 677 | |
| 678 if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) | |
| 679 { | |
| 680 /* emit_push_insn might not work properly if arg->value and | |
| 681 argblock + arg->locate.offset areas overlap. */ | |
| 682 rtx x = arg->value; | |
| 683 int i = 0; | |
| 684 | |
| 685 if (XEXP (x, 0) == crtl->args.internal_arg_pointer | |
| 686 || (GET_CODE (XEXP (x, 0)) == PLUS | |
| 687 && XEXP (XEXP (x, 0), 0) == | |
| 688 crtl->args.internal_arg_pointer | |
| 689 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
| 690 { | |
| 691 if (XEXP (x, 0) != crtl->args.internal_arg_pointer) | |
| 692 i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
| 693 | |
| 694 /* expand_call should ensure this. */ | |
| 695 gcc_assert (!arg->locate.offset.var | |
| 696 && GET_CODE (size_rtx) == CONST_INT); | |
| 697 } | |
| 698 } | |
| 699 | |
| 700 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, | |
| 701 parm_align, partial, reg, excess, argblock, | |
| 702 ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, | |
| 703 ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
| 704 | |
| 705 /* Unless this is a partially-in-register argument, the argument is now | |
| 706 in the stack. | |
| 707 | |
| 708 ??? Unlike the case above, in which we want the actual | |
| 709 address of the data, so that we can load it directly into a | |
| 710 register, here we want the address of the stack slot, so that | |
| 711 it's properly aligned for word-by-word copying or something | |
| 712 like that. It's not clear that this is always correct. */ | |
| 713 if (partial == 0) | |
| 714 arg->value = arg->stack_slot; | |
| 715 } | |
| 716 | |
| 717 if (arg->reg && GET_CODE (arg->reg) == PARALLEL) | |
| 718 { | |
| 719 tree type = TREE_TYPE (arg->tree_value); | |
| 720 arg->parallel_value | |
| 721 = emit_group_load_into_temps (arg->reg, arg->value, type, | |
| 722 int_size_in_bytes (type)); | |
| 723 } | |
| 724 | |
| 725 /* Mark all slots this store used. */ | |
| 726 if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
| 727 && argblock && ! variable_size && arg->stack) | |
| 728 for (i = lower_bound; i < upper_bound; i++) | |
| 729 stack_usage_map[i] = 1; | |
| 730 | |
| 731 /* Once we have pushed something, pops can't safely | |
| 732 be deferred during the rest of the arguments. */ | |
| 733 NO_DEFER_POP; | |
| 734 | |
| 735 /* Free any temporary slots made in processing this argument. Show | |
| 736 that we might have taken the address of something and pushed that | |
| 737 as an operand. */ | |
| 738 preserve_temp_slots (NULL_RTX); | |
| 739 free_temp_slots (); | |
| 740 pop_temp_slots (); | |
| 741 | |
| 742 return 0; | |
| 743 } | |
| 744 | |
| 745 static void | |
| 746 determine_order(int *order, int num_actuals) | |
| 747 { | |
| 748 int i; | |
| 749 for (i=0; i<num_actuals; i++) | |
| 750 order[i] = num_actuals-i-1; | |
| 751 return; | |
| 752 } | |
| 753 | |
| 754 static void | |
| 755 push_overlaps(struct arg_data *args, int num_actuals) | |
| 756 { | |
| 757 int i; | |
| 758 | |
| 759 for (i=0; i<num_actuals; i++) | |
| 760 { | |
| 761 int dst_offset; /* */ | |
| 762 int src_offset; /* */ | |
| 763 rtx temp; | |
| 764 if ( (dst_offset=check_frame_offset(args[i].stack)) < 0 ) continue; | |
| 765 if ( (src_offset=check_frame_offset(args[i].value)) < 0 ) continue; | |
| 766 | |
| 767 /* 退避 */ | |
| 768 temp = assign_temp(args[i].tree_value, 1, 0, 0); | |
| 769 if ( args[i].mode==BLKmode ) | |
| 770 emit_block_move ( temp, args[i].value, ARGS_SIZE_RTX(args[i].locate.size), 0 ); | |
| 771 else | |
| 772 emit_move_insn ( temp, args[i].value ); | |
| 773 args[i].value = temp; | |
| 774 | |
| 775 } | |
| 776 return; | |
| 777 } | |
| 778 | |
| 779 static int | |
| 780 check_frame_offset(rtx x) | |
| 781 { | |
| 782 int i; | |
| 783 rtx addr; | |
| 784 if ( !x || !MEM_P(x)) | |
| 785 return -1; | |
| 786 | |
| 787 addr = XEXP(x, 0); | |
| 788 if (addr == crtl->args.internal_arg_pointer) | |
| 789 i = 0; | |
| 790 else if (GET_CODE (addr) == PLUS | |
| 791 && XEXP (addr, 0) == crtl->args.internal_arg_pointer | |
| 792 && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
| 793 i = INTVAL (XEXP (addr, 1)); | |
| 794 else if (GET_CODE (addr) == PLUS | |
| 795 && GET_CODE (XEXP (addr, 0)) == CONST_INT | |
| 796 && XEXP (addr, 1) == crtl->args.internal_arg_pointer ) | |
| 797 i = INTVAL (XEXP (addr, 0)); | |
| 798 else | |
| 799 return -1; | |
| 800 | |
| 801 return i; | |
| 802 } | |
| 803 |