1 /* Convert function calls to rtl insns, for GNU C compiler.
2 Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
30 #include "insn-flags.h"
37 #ifndef ACCUMULATE_OUTGOING_ARGS
38 #define ACCUMULATE_OUTGOING_ARGS 0
41 /* Supply a default definition for PUSH_ARGS. */
44 #define PUSH_ARGS !ACCUMULATE_OUTGOING_ARGS
50 #if !defined FUNCTION_OK_FOR_SIBCALL
51 #define FUNCTION_OK_FOR_SIBCALL(DECL) 1
54 #if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY
55 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
58 /* Decide whether a function's arguments should be processed
59 from first to last or from last to first.
61 They should if the stack and args grow in opposite directions, but
62 only if we have push insns. */
66 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
67 #define PUSH_ARGS_REVERSED PUSH_ARGS
72 #ifndef PUSH_ARGS_REVERSED
73 #define PUSH_ARGS_REVERSED 0
76 /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */
77 #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT)
79 /* Data structure and subroutines used within expand_call. */
83 /* Tree node for this argument. */
85 /* Mode for value; TYPE_MODE unless promoted. */
86 enum machine_mode mode;
87 /* Current RTL value for argument, or 0 if it isn't precomputed. */
89 /* Initially-compute RTL value for argument; only for const functions. */
91 /* Register to pass this argument in, 0 if passed on stack, or an
92 PARALLEL if the arg is to be copied into multiple non-contiguous
95 /* Register to pass this argument in when generating tail call sequence.
96 This is not the same register as for normal calls on machines with
99 /* If REG was promoted from the actual mode of the argument expression,
100 indicates whether the promotion is sign- or zero-extended. */
102 /* Number of registers to use. 0 means put the whole arg in registers.
103 Also 0 if not passed in registers. */
105 /* Non-zero if argument must be passed on stack.
106 Note that some arguments may be passed on the stack
107 even though pass_on_stack is zero, just because FUNCTION_ARG says so.
108 pass_on_stack identifies arguments that *cannot* go in registers. */
110 /* Offset of this argument from beginning of stack-args. */
111 struct args_size offset;
112 /* Similar, but offset to the start of the stack slot. Different from
113 OFFSET if this arg pads downward. */
114 struct args_size slot_offset;
115 /* Size of this argument on the stack, rounded up for any padding it gets,
116 parts of the argument passed in registers do not count.
117 If REG_PARM_STACK_SPACE is defined, then register parms
118 are counted here as well. */
119 struct args_size size;
120 /* Location on the stack at which parameter should be stored. The store
121 has already been done if STACK == VALUE. */
123 /* Location on the stack of the start of this argument slot. This can
124 differ from STACK if this arg pads downward. This location is known
125 to be aligned to FUNCTION_ARG_BOUNDARY. */
127 /* Place that this stack area has been saved, if needed. */
129 /* If an argument's alignment does not permit direct copying into registers,
130 copy in smaller-sized pieces into pseudos. These are stored in a
131 block pointed to by this field. The next field says how many
132 word-sized pseudos we made. */
135 /* The amount that the stack pointer needs to be adjusted to
136 force alignment for the next argument. */
137 struct args_size alignment_pad;
140 /* A vector of one char per byte of stack space. A byte if non-zero if
141 the corresponding stack location has been used.
142 This vector is used to prevent a function call within an argument from
143 clobbering any stack already set up. */
144 static char *stack_usage_map;
146 /* Size of STACK_USAGE_MAP. */
147 static int highest_outgoing_arg_in_use;
149 /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding
150 stack location's tail call argument has been already stored into the stack.
151 This bitmap is used to prevent sibling call optimization if function tries
152 to use parent's incoming argument slots when they have been already
153 overwritten with tail call arguments. */
154 static sbitmap stored_args_map;
156 /* stack_arg_under_construction is nonzero when an argument may be
157 initialized with a constructor call (including a C function that
158 returns a BLKmode struct) and expand_call must take special action
159 to make sure the object being constructed does not overlap the
160 argument list for the constructor call. */
161 int stack_arg_under_construction;
163 static int calls_function PARAMS ((tree, int));
164 static int calls_function_1 PARAMS ((tree, int));
166 /* Nonzero if this is a call to a `const' function. */
168 /* Nonzero if this is a call to a `volatile' function. */
169 #define ECF_NORETURN 2
170 /* Nonzero if this is a call to malloc or a related function. */
172 /* Nonzero if it is plausible that this is a call to alloca. */
173 #define ECF_MAY_BE_ALLOCA 8
174 /* Nonzero if this is a call to a function that won't throw an exception. */
175 #define ECF_NOTHROW 16
176 /* Nonzero if this is a call to setjmp or a related function. */
177 #define ECF_RETURNS_TWICE 32
178 /* Nonzero if this is a call to `longjmp'. */
179 #define ECF_LONGJMP 64
180 /* Nonzero if this is a syscall that makes a new process in the image of
182 #define ECF_FORK_OR_EXEC 128
183 #define ECF_SIBCALL 256
184 /* Nonzero if this is a call to "pure" function (like const function,
185 but may read memory. */
187 /* Nonzero if this is a call to a function that returns with the stack
188 pointer depressed. */
189 #define ECF_SP_DEPRESSED 1024
191 static void emit_call_1 PARAMS ((rtx, tree, tree, HOST_WIDE_INT,
192 HOST_WIDE_INT, HOST_WIDE_INT, rtx,
193 rtx, int, rtx, int));
194 static void precompute_register_parameters PARAMS ((int,
197 static int store_one_arg PARAMS ((struct arg_data *, rtx, int, int,
199 static void store_unaligned_arguments_into_pseudos PARAMS ((struct arg_data *,
201 static int finalize_must_preallocate PARAMS ((int, int,
203 struct args_size *));
204 static void precompute_arguments PARAMS ((int, int,
206 static int compute_argument_block_size PARAMS ((int,
209 static void initialize_argument_information PARAMS ((int,
216 static void compute_argument_addresses PARAMS ((struct arg_data *,
218 static rtx rtx_for_function_call PARAMS ((tree, tree));
219 static void load_register_parameters PARAMS ((struct arg_data *,
221 static int libfunc_nothrow PARAMS ((rtx));
222 static rtx emit_library_call_value_1 PARAMS ((int, rtx, rtx, int,
225 static int special_function_p PARAMS ((tree, int));
226 static int flags_from_decl_or_type PARAMS ((tree));
227 static rtx try_to_integrate PARAMS ((tree, tree, rtx,
229 static int check_sibcall_argument_overlap_1 PARAMS ((rtx));
230 static int check_sibcall_argument_overlap PARAMS ((rtx, struct arg_data *));
232 static int combine_pending_stack_adjustment_and_call
233 PARAMS ((int, struct args_size *, int));
235 #ifdef REG_PARM_STACK_SPACE
236 static rtx save_fixed_argument_area PARAMS ((int, rtx, int *, int *));
237 static void restore_fixed_argument_area PARAMS ((rtx, rtx, int, int));
240 /* If WHICH is 1, return 1 if EXP contains a call to the built-in function
243 If WHICH is 0, return 1 if EXP contains a call to any function.
244 Actually, we only need return 1 if evaluating EXP would require pushing
245 arguments on the stack, but that is too difficult to compute, so we just
246 assume any function call might require the stack. */
248 static tree calls_function_save_exprs;
251 calls_function (exp, which)
257 calls_function_save_exprs = 0;
258 val = calls_function_1 (exp, which);
259 calls_function_save_exprs = 0;
263 /* Recursive function to do the work of above function. */
266 calls_function_1 (exp, which)
271 enum tree_code code = TREE_CODE (exp);
272 int class = TREE_CODE_CLASS (code);
273 int length = first_rtl_op (code);
275 /* If this code is language-specific, we don't know what it will do. */
276 if ((int) code >= NUM_TREE_CODES)
284 else if ((TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
286 && (TYPE_RETURNS_STACK_DEPRESSED
287 (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))))
289 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
290 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
292 && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
294 & ECF_MAY_BE_ALLOCA))
300 if (SAVE_EXPR_RTL (exp) != 0)
302 if (value_member (exp, calls_function_save_exprs))
304 calls_function_save_exprs = tree_cons (NULL_TREE, exp,
305 calls_function_save_exprs);
306 return (TREE_OPERAND (exp, 0) != 0
307 && calls_function_1 (TREE_OPERAND (exp, 0), which));
312 register tree subblock;
314 for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local))
315 if (DECL_INITIAL (local) != 0
316 && calls_function_1 (DECL_INITIAL (local), which))
319 for (subblock = BLOCK_SUBBLOCKS (exp);
321 subblock = TREE_CHAIN (subblock))
322 if (calls_function_1 (subblock, which))
328 for (; exp != 0; exp = TREE_CHAIN (exp))
329 if (calls_function_1 (TREE_VALUE (exp), which))
337 /* Only expressions, references, and blocks can contain calls. */
338 if (! IS_EXPR_CODE_CLASS (class) && class != 'r' && class != 'b')
341 for (i = 0; i < length; i++)
342 if (TREE_OPERAND (exp, i) != 0
343 && calls_function_1 (TREE_OPERAND (exp, i), which))
349 /* Force FUNEXP into a form suitable for the address of a CALL,
350 and return that as an rtx. Also load the static chain register
351 if FNDECL is a nested function.
353 CALL_FUSAGE points to a variable holding the prospective
354 CALL_INSN_FUNCTION_USAGE information. */
357 prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen)
363 rtx static_chain_value = 0;
365 funexp = protect_from_queue (funexp, 0);
368 /* Get possible static chain value for nested function in C. */
369 static_chain_value = lookup_static_chain (fndecl);
371 /* Make a valid memory address and copy constants thru pseudo-regs,
372 but not for a constant address if -fno-function-cse. */
373 if (GET_CODE (funexp) != SYMBOL_REF)
374 /* If we are using registers for parameters, force the
375 function address into a register now. */
376 funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen)
377 ? force_not_mem (memory_address (FUNCTION_MODE, funexp))
378 : memory_address (FUNCTION_MODE, funexp));
381 #ifndef NO_FUNCTION_CSE
382 if (optimize && ! flag_no_function_cse)
383 #ifdef NO_RECURSIVE_FUNCTION_CSE
384 if (fndecl != current_function_decl)
386 funexp = force_reg (Pmode, funexp);
390 if (static_chain_value != 0)
392 emit_move_insn (static_chain_rtx, static_chain_value);
394 if (GET_CODE (static_chain_rtx) == REG)
395 use_reg (call_fusage, static_chain_rtx);
401 /* Generate instructions to call function FUNEXP,
402 and optionally pop the results.
403 The CALL_INSN is the first insn generated.
405 FNDECL is the declaration node of the function. This is given to the
406 macro RETURN_POPS_ARGS to determine whether this function pops its own args.
408 FUNTYPE is the data type of the function. This is given to the macro
409 RETURN_POPS_ARGS to determine whether this function pops its own args.
410 We used to allow an identifier for library functions, but that doesn't
411 work when the return type is an aggregate type and the calling convention
412 says that the pointer to this aggregate is to be popped by the callee.
414 STACK_SIZE is the number of bytes of arguments on the stack,
415 ROUNDED_STACK_SIZE is that number rounded up to
416 PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is
417 both to put into the call insn and to generate explicit popping
420 STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value.
421 It is zero if this call doesn't want a structure value.
423 NEXT_ARG_REG is the rtx that results from executing
424 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1)
425 just after all the args have had their registers assigned.
426 This could be whatever you like, but normally it is the first
427 arg-register beyond those used for args in this call,
428 or 0 if all the arg-registers are used in this call.
429 It is passed on to `gen_call' so you can put this info in the call insn.
431 VALREG is a hard register in which a value is returned,
432 or 0 if the call does not return a value.
434 OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before
435 the args to this call were processed.
436 We restore `inhibit_defer_pop' to that value.
438 CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that
439 denote registers used by the called function. */
442 emit_call_1 (funexp, fndecl, funtype, stack_size, rounded_stack_size,
443 struct_value_size, next_arg_reg, valreg, old_inhibit_defer_pop,
444 call_fusage, ecf_flags)
446 tree fndecl ATTRIBUTE_UNUSED;
447 tree funtype ATTRIBUTE_UNUSED;
448 HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED;
449 HOST_WIDE_INT rounded_stack_size;
450 HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED;
453 int old_inhibit_defer_pop;
457 rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size);
459 int already_popped = 0;
460 HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size);
461 #if defined (HAVE_call) && defined (HAVE_call_value)
462 rtx struct_value_size_rtx;
463 struct_value_size_rtx = GEN_INT (struct_value_size);
466 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
467 and we don't want to load it into a register as an optimization,
468 because prepare_call_address already did it if it should be done. */
469 if (GET_CODE (funexp) != SYMBOL_REF)
470 funexp = memory_address (FUNCTION_MODE, funexp);
472 #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop)
473 if ((ecf_flags & ECF_SIBCALL)
474 && HAVE_sibcall_pop && HAVE_sibcall_value_pop
475 && (RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0
478 rtx n_pop = GEN_INT (RETURN_POPS_ARGS (fndecl, funtype, stack_size));
481 /* If this subroutine pops its own args, record that in the call insn
482 if possible, for the sake of frame pointer elimination. */
485 pat = GEN_SIBCALL_VALUE_POP (valreg,
486 gen_rtx_MEM (FUNCTION_MODE, funexp),
487 rounded_stack_size_rtx, next_arg_reg,
490 pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp),
491 rounded_stack_size_rtx, next_arg_reg, n_pop);
493 emit_call_insn (pat);
499 #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop)
500 /* If the target has "call" or "call_value" insns, then prefer them
501 if no arguments are actually popped. If the target does not have
502 "call" or "call_value" insns, then we must use the popping versions
503 even if the call has no arguments to pop. */
504 #if defined (HAVE_call) && defined (HAVE_call_value)
505 if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop
506 && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED))
508 if (HAVE_call_pop && HAVE_call_value_pop)
511 rtx n_pop = GEN_INT (n_popped);
514 /* If this subroutine pops its own args, record that in the call insn
515 if possible, for the sake of frame pointer elimination. */
518 pat = GEN_CALL_VALUE_POP (valreg,
519 gen_rtx_MEM (FUNCTION_MODE, funexp),
520 rounded_stack_size_rtx, next_arg_reg, n_pop);
522 pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp),
523 rounded_stack_size_rtx, next_arg_reg, n_pop);
525 emit_call_insn (pat);
531 #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value)
532 if ((ecf_flags & ECF_SIBCALL)
533 && HAVE_sibcall && HAVE_sibcall_value)
536 emit_call_insn (GEN_SIBCALL_VALUE (valreg,
537 gen_rtx_MEM (FUNCTION_MODE, funexp),
538 rounded_stack_size_rtx,
539 next_arg_reg, NULL_RTX));
541 emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp),
542 rounded_stack_size_rtx, next_arg_reg,
543 struct_value_size_rtx));
548 #if defined (HAVE_call) && defined (HAVE_call_value)
549 if (HAVE_call && HAVE_call_value)
552 emit_call_insn (GEN_CALL_VALUE (valreg,
553 gen_rtx_MEM (FUNCTION_MODE, funexp),
554 rounded_stack_size_rtx, next_arg_reg,
557 emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp),
558 rounded_stack_size_rtx, next_arg_reg,
559 struct_value_size_rtx));
565 /* Find the CALL insn we just emitted. */
566 for (call_insn = get_last_insn ();
567 call_insn && GET_CODE (call_insn) != CALL_INSN;
568 call_insn = PREV_INSN (call_insn))
574 /* Mark memory as used for "pure" function call. */
575 if (ecf_flags & ECF_PURE)
577 call_fusage = gen_rtx_EXPR_LIST (VOIDmode,
578 gen_rtx_USE (VOIDmode,
579 gen_rtx_MEM (BLKmode,
580 gen_rtx_SCRATCH (VOIDmode))), call_fusage);
583 /* Put the register usage information on the CALL. If there is already
584 some usage information, put ours at the end. */
585 if (CALL_INSN_FUNCTION_USAGE (call_insn))
589 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
590 link = XEXP (link, 1))
593 XEXP (link, 1) = call_fusage;
596 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
598 /* If this is a const call, then set the insn's unchanging bit. */
599 if (ecf_flags & (ECF_CONST | ECF_PURE))
600 CONST_CALL_P (call_insn) = 1;
602 /* If this call can't throw, attach a REG_EH_REGION reg note to that
604 if (ecf_flags & ECF_NOTHROW)
605 REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx,
606 REG_NOTES (call_insn));
608 SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0);
610 /* Restore this now, so that we do defer pops for this call's args
611 if the context of the call as a whole permits. */
612 inhibit_defer_pop = old_inhibit_defer_pop;
617 CALL_INSN_FUNCTION_USAGE (call_insn)
618 = gen_rtx_EXPR_LIST (VOIDmode,
619 gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx),
620 CALL_INSN_FUNCTION_USAGE (call_insn));
621 rounded_stack_size -= n_popped;
622 rounded_stack_size_rtx = GEN_INT (rounded_stack_size);
623 stack_pointer_delta -= n_popped;
626 if (!ACCUMULATE_OUTGOING_ARGS)
628 /* If returning from the subroutine does not automatically pop the args,
629 we need an instruction to pop them sooner or later.
630 Perhaps do it now; perhaps just record how much space to pop later.
632 If returning from the subroutine does pop the args, indicate that the
633 stack pointer will be changed. */
635 if (rounded_stack_size != 0 && ! (ecf_flags & ECF_SP_DEPRESSED))
637 if (flag_defer_pop && inhibit_defer_pop == 0
638 && ! (ecf_flags & (ECF_CONST | ECF_PURE)))
639 pending_stack_adjust += rounded_stack_size;
641 adjust_stack (rounded_stack_size_rtx);
644 /* When we accumulate outgoing args, we must avoid any stack manipulations.
645 Restore the stack pointer to its original value now. Usually
646 ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions.
647 On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and
648 popping variants of functions exist as well.
650 ??? We may optimize similar to defer_pop above, but it is
651 probably not worthwhile.
653 ??? It will be worthwhile to enable combine_stack_adjustments even for
656 anti_adjust_stack (GEN_INT (n_popped));
659 /* Determine if the function identified by NAME and FNDECL is one with
660 special properties we wish to know about.
662 For example, if the function might return more than one time (setjmp), then
663 set RETURNS_TWICE to a nonzero value.
665 Similarly set LONGJMP for if the function is in the longjmp family.
667 Set MALLOC for any of the standard memory allocation functions which
668 allocate from the heap.
670 Set MAY_BE_ALLOCA for any memory allocation function that might allocate
671 space from the stack such as alloca. */
674 special_function_p (fndecl, flags)
678 if (! (flags & ECF_MALLOC)
679 && fndecl && DECL_NAME (fndecl)
680 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17
681 /* Exclude functions not at the file scope, or not `extern',
682 since they are not the magic functions we would otherwise
684 && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl))
686 const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl));
687 const char *tname = name;
689 /* We assume that alloca will always be called by name. It
690 makes no sense to pass it as a pointer-to-function to
691 anything that does not understand its behavior. */
692 if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6
694 && ! strcmp (name, "alloca"))
695 || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16
697 && ! strcmp (name, "__builtin_alloca"))))
698 flags |= ECF_MAY_BE_ALLOCA;
700 /* Disregard prefix _, __ or __x. */
703 if (name[1] == '_' && name[2] == 'x')
705 else if (name[1] == '_')
714 && (! strcmp (tname, "setjmp")
715 || ! strcmp (tname, "setjmp_syscall")))
717 && ! strcmp (tname, "sigsetjmp"))
719 && ! strcmp (tname, "savectx")))
720 flags |= ECF_RETURNS_TWICE;
723 && ! strcmp (tname, "siglongjmp"))
724 flags |= ECF_LONGJMP;
726 else if ((tname[0] == 'q' && tname[1] == 's'
727 && ! strcmp (tname, "qsetjmp"))
728 || (tname[0] == 'v' && tname[1] == 'f'
729 && ! strcmp (tname, "vfork")))
730 flags |= ECF_RETURNS_TWICE;
732 else if (tname[0] == 'l' && tname[1] == 'o'
733 && ! strcmp (tname, "longjmp"))
734 flags |= ECF_LONGJMP;
736 else if ((tname[0] == 'f' && tname[1] == 'o'
737 && ! strcmp (tname, "fork"))
738 /* Linux specific: __clone. check NAME to insist on the
739 leading underscores, to avoid polluting the ISO / POSIX
741 || (name[0] == '_' && name[1] == '_'
742 && ! strcmp (tname, "clone"))
743 || (tname[0] == 'e' && tname[1] == 'x' && tname[2] == 'e'
744 && tname[3] == 'c' && (tname[4] == 'l' || tname[4] == 'v')
746 || ((tname[5] == 'p' || tname[5] == 'e')
747 && tname[6] == '\0'))))
748 flags |= ECF_FORK_OR_EXEC;
750 /* Do not add any more malloc-like functions to this list,
751 instead mark them as malloc functions using the malloc attribute.
752 Note, realloc is not suitable for attribute malloc since
753 it may return the same address across multiple calls.
754 C++ operator new is not suitable because it is not required
755 to return a unique pointer; indeed, the standard placement new
756 just returns its argument. */
757 else if (TYPE_MODE (TREE_TYPE (TREE_TYPE (fndecl))) == Pmode
758 && (! strcmp (tname, "malloc")
759 || ! strcmp (tname, "calloc")
760 || ! strcmp (tname, "strdup")))
766 /* Return nonzero when tree represent call to longjmp. */
769 setjmp_call_p (fndecl)
772 return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE;
775 /* Detect flags (function attributes) from the function type node. */
778 flags_from_decl_or_type (exp)
783 /* ??? We can't set IS_MALLOC for function types? */
786 /* The function exp may have the `malloc' attribute. */
787 if (DECL_P (exp) && DECL_IS_MALLOC (exp))
790 /* The function exp may have the `pure' attribute. */
791 if (DECL_P (exp) && DECL_IS_PURE (exp))
794 if (TREE_NOTHROW (exp))
795 flags |= ECF_NOTHROW;
798 if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp))
801 if (TREE_THIS_VOLATILE (exp))
802 flags |= ECF_NORETURN;
808 /* Precompute all register parameters as described by ARGS, storing values
809 into fields within the ARGS array.
811 NUM_ACTUALS indicates the total number elements in the ARGS array.
813 Set REG_PARM_SEEN if we encounter a register parameter. */
816 precompute_register_parameters (num_actuals, args, reg_parm_seen)
818 struct arg_data *args;
825 for (i = 0; i < num_actuals; i++)
826 if (args[i].reg != 0 && ! args[i].pass_on_stack)
830 if (args[i].value == 0)
833 args[i].value = expand_expr (args[i].tree_value, NULL_RTX,
835 preserve_temp_slots (args[i].value);
838 /* ANSI doesn't require a sequence point here,
839 but PCC has one, so this will avoid some problems. */
843 /* If we are to promote the function arg to a wider mode,
846 if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value)))
848 = convert_modes (args[i].mode,
849 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
850 args[i].value, args[i].unsignedp);
852 /* If the value is expensive, and we are inside an appropriately
853 short loop, put the value into a pseudo and then put the pseudo
856 For small register classes, also do this if this call uses
857 register parameters. This is to avoid reload conflicts while
858 loading the parameters registers. */
860 if ((! (GET_CODE (args[i].value) == REG
861 || (GET_CODE (args[i].value) == SUBREG
862 && GET_CODE (SUBREG_REG (args[i].value)) == REG)))
863 && args[i].mode != BLKmode
864 && rtx_cost (args[i].value, SET) > 2
865 && ((SMALL_REGISTER_CLASSES && *reg_parm_seen)
866 || preserve_subexpressions_p ()))
867 args[i].value = copy_to_mode_reg (args[i].mode, args[i].value);
871 #ifdef REG_PARM_STACK_SPACE
873 /* The argument list is the property of the called routine and it
874 may clobber it. If the fixed area has been used for previous
875 parameters, we must save and restore it. */
878 save_fixed_argument_area (reg_parm_stack_space, argblock,
879 low_to_save, high_to_save)
880 int reg_parm_stack_space;
886 rtx save_area = NULL_RTX;
888 /* Compute the boundary of the that needs to be saved, if any. */
889 #ifdef ARGS_GROW_DOWNWARD
890 for (i = 0; i < reg_parm_stack_space + 1; i++)
892 for (i = 0; i < reg_parm_stack_space; i++)
895 if (i >= highest_outgoing_arg_in_use
896 || stack_usage_map[i] == 0)
899 if (*low_to_save == -1)
905 if (*low_to_save >= 0)
907 int num_to_save = *high_to_save - *low_to_save + 1;
908 enum machine_mode save_mode
909 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
912 /* If we don't have the required alignment, must do this in BLKmode. */
913 if ((*low_to_save & (MIN (GET_MODE_SIZE (save_mode),
914 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
917 #ifdef ARGS_GROW_DOWNWARD
919 = gen_rtx_MEM (save_mode,
920 memory_address (save_mode,
921 plus_constant (argblock,
924 stack_area = gen_rtx_MEM (save_mode,
925 memory_address (save_mode,
926 plus_constant (argblock,
929 if (save_mode == BLKmode)
931 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
932 /* Cannot use emit_block_move here because it can be done by a
933 library call which in turn gets into this place again and deadly
934 infinite recursion happens. */
935 move_by_pieces (validize_mem (save_area), stack_area, num_to_save,
940 save_area = gen_reg_rtx (save_mode);
941 emit_move_insn (save_area, stack_area);
948 restore_fixed_argument_area (save_area, argblock, high_to_save, low_to_save)
954 enum machine_mode save_mode = GET_MODE (save_area);
955 #ifdef ARGS_GROW_DOWNWARD
957 = gen_rtx_MEM (save_mode,
958 memory_address (save_mode,
959 plus_constant (argblock,
963 = gen_rtx_MEM (save_mode,
964 memory_address (save_mode,
965 plus_constant (argblock,
969 if (save_mode != BLKmode)
970 emit_move_insn (stack_area, save_area);
972 /* Cannot use emit_block_move here because it can be done by a library
973 call which in turn gets into this place again and deadly infinite
974 recursion happens. */
975 move_by_pieces (stack_area, validize_mem (save_area),
976 high_to_save - low_to_save + 1, PARM_BOUNDARY);
980 /* If any elements in ARGS refer to parameters that are to be passed in
981 registers, but not in memory, and whose alignment does not permit a
982 direct copy into registers. Copy the values into a group of pseudos
983 which we will later copy into the appropriate hard registers.
985 Pseudos for each unaligned argument will be stored into the array
986 args[argnum].aligned_regs. The caller is responsible for deallocating
987 the aligned_regs array if it is nonzero. */
990 store_unaligned_arguments_into_pseudos (args, num_actuals)
991 struct arg_data *args;
996 for (i = 0; i < num_actuals; i++)
997 if (args[i].reg != 0 && ! args[i].pass_on_stack
998 && args[i].mode == BLKmode
999 && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value))
1000 < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD)))
1002 int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1003 int big_endian_correction = 0;
1005 args[i].n_aligned_regs
1006 = args[i].partial ? args[i].partial
1007 : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
1009 args[i].aligned_regs = (rtx *) xmalloc (sizeof (rtx)
1010 * args[i].n_aligned_regs);
1012 /* Structures smaller than a word are aligned to the least
1013 significant byte (to the right). On a BYTES_BIG_ENDIAN machine,
1014 this means we must skip the empty high order bytes when
1015 calculating the bit offset. */
1016 if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD)
1017 big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT));
1019 for (j = 0; j < args[i].n_aligned_regs; j++)
1021 rtx reg = gen_reg_rtx (word_mode);
1022 rtx word = operand_subword_force (args[i].value, j, BLKmode);
1023 int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD);
1024 int bitalign = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
1026 args[i].aligned_regs[j] = reg;
1028 /* There is no need to restrict this code to loading items
1029 in TYPE_ALIGN sized hunks. The bitfield instructions can
1030 load up entire word sized registers efficiently.
1032 ??? This may not be needed anymore.
1033 We use to emit a clobber here but that doesn't let later
1034 passes optimize the instructions we emit. By storing 0 into
1035 the register later passes know the first AND to zero out the
1036 bitfield being set in the register is unnecessary. The store
1037 of 0 will be deleted as will at least the first AND. */
1039 emit_move_insn (reg, const0_rtx);
1041 bytes -= bitsize / BITS_PER_UNIT;
1042 store_bit_field (reg, bitsize, big_endian_correction, word_mode,
1043 extract_bit_field (word, bitsize, 0, 1, NULL_RTX,
1044 word_mode, word_mode, bitalign,
1046 bitalign, BITS_PER_WORD);
1051 /* Fill in ARGS_SIZE and ARGS array based on the parameters found in
1054 NUM_ACTUALS is the total number of parameters.
1056 N_NAMED_ARGS is the total number of named arguments.
1058 FNDECL is the tree code for the target of this call (if known)
1060 ARGS_SO_FAR holds state needed by the target to know where to place
1063 REG_PARM_STACK_SPACE is the number of bytes of stack space reserved
1064 for arguments which are passed in registers.
1066 OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level
1067 and may be modified by this routine.
1069 OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer
1070 flags which may may be modified by this routine. */
1073 initialize_argument_information (num_actuals, args, args_size, n_named_args,
1074 actparms, fndecl, args_so_far,
1075 reg_parm_stack_space, old_stack_level,
1076 old_pending_adj, must_preallocate,
1078 int num_actuals ATTRIBUTE_UNUSED;
1079 struct arg_data *args;
1080 struct args_size *args_size;
1081 int n_named_args ATTRIBUTE_UNUSED;
1084 CUMULATIVE_ARGS *args_so_far;
1085 int reg_parm_stack_space;
1086 rtx *old_stack_level;
1087 int *old_pending_adj;
1088 int *must_preallocate;
1091 /* 1 if scanning parms front to back, -1 if scanning back to front. */
1094 /* Count arg position in order args appear. */
1097 struct args_size alignment_pad;
1101 args_size->constant = 0;
1104 /* In this loop, we consider args in the order they are written.
1105 We fill up ARGS from the front or from the back if necessary
1106 so that in any case the first arg to be pushed ends up at the front. */
1108 if (PUSH_ARGS_REVERSED)
1110 i = num_actuals - 1, inc = -1;
1111 /* In this case, must reverse order of args
1112 so that we compute and push the last arg first. */
1119 /* I counts args in order (to be) pushed; ARGPOS counts in order written. */
1120 for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++)
1122 tree type = TREE_TYPE (TREE_VALUE (p));
1124 enum machine_mode mode;
1126 args[i].tree_value = TREE_VALUE (p);
1128 /* Replace erroneous argument with constant zero. */
1129 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
1130 args[i].tree_value = integer_zero_node, type = integer_type_node;
1132 /* If TYPE is a transparent union, pass things the way we would
1133 pass the first field of the union. We have already verified that
1134 the modes are the same. */
1135 if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type))
1136 type = TREE_TYPE (TYPE_FIELDS (type));
1138 /* Decide where to pass this arg.
1140 args[i].reg is nonzero if all or part is passed in registers.
1142 args[i].partial is nonzero if part but not all is passed in registers,
1143 and the exact value says how many words are passed in registers.
1145 args[i].pass_on_stack is nonzero if the argument must at least be
1146 computed on the stack. It may then be loaded back into registers
1147 if args[i].reg is nonzero.
1149 These decisions are driven by the FUNCTION_... macros and must agree
1150 with those made by function.c. */
1152 /* See if this argument should be passed by invisible reference. */
1153 if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1154 && contains_placeholder_p (TYPE_SIZE (type)))
1155 || TREE_ADDRESSABLE (type)
1156 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
1157 || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type),
1158 type, argpos < n_named_args)
1162 /* If we're compiling a thunk, pass through invisible
1163 references instead of making a copy. */
1164 if (current_function_is_thunk
1165 #ifdef FUNCTION_ARG_CALLEE_COPIES
1166 || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type),
1167 type, argpos < n_named_args)
1168 /* If it's in a register, we must make a copy of it too. */
1169 /* ??? Is this a sufficient test? Is there a better one? */
1170 && !(TREE_CODE (args[i].tree_value) == VAR_DECL
1171 && REG_P (DECL_RTL (args[i].tree_value)))
1172 && ! TREE_ADDRESSABLE (type))
1176 /* C++ uses a TARGET_EXPR to indicate that we want to make a
1177 new object from the argument. If we are passing by
1178 invisible reference, the callee will do that for us, so we
1179 can strip off the TARGET_EXPR. This is not always safe,
1180 but it is safe in the only case where this is a useful
1181 optimization; namely, when the argument is a plain object.
1182 In that case, the frontend is just asking the backend to
1183 make a bitwise copy of the argument. */
1185 if (TREE_CODE (args[i].tree_value) == TARGET_EXPR
1186 && (DECL_P (TREE_OPERAND (args[i].tree_value, 1)))
1187 && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1))))
1188 args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1);
1190 args[i].tree_value = build1 (ADDR_EXPR,
1191 build_pointer_type (type),
1192 args[i].tree_value);
1193 type = build_pointer_type (type);
1197 /* We make a copy of the object and pass the address to the
1198 function being called. */
1201 if (!COMPLETE_TYPE_P (type)
1202 || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1203 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1204 && (0 < compare_tree_int (TYPE_SIZE_UNIT (type),
1205 STACK_CHECK_MAX_VAR_SIZE))))
1207 /* This is a variable-sized object. Make space on the stack
1209 rtx size_rtx = expr_size (TREE_VALUE (p));
1211 if (*old_stack_level == 0)
1213 emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX);
1214 *old_pending_adj = pending_stack_adjust;
1215 pending_stack_adjust = 0;
1218 copy = gen_rtx_MEM (BLKmode,
1219 allocate_dynamic_stack_space
1220 (size_rtx, NULL_RTX, TYPE_ALIGN (type)));
1221 set_mem_attributes (copy, type, 1);
1224 copy = assign_temp (type, 0, 1, 0);
1226 store_expr (args[i].tree_value, copy, 0);
1227 *ecf_flags &= ~(ECF_CONST | ECF_PURE);
1229 args[i].tree_value = build1 (ADDR_EXPR,
1230 build_pointer_type (type),
1231 make_tree (type, copy));
1232 type = build_pointer_type (type);
1236 mode = TYPE_MODE (type);
1237 unsignedp = TREE_UNSIGNED (type);
1239 #ifdef PROMOTE_FUNCTION_ARGS
1240 mode = promote_mode (type, mode, &unsignedp, 1);
1243 args[i].unsignedp = unsignedp;
1244 args[i].mode = mode;
1246 args[i].reg = FUNCTION_ARG (*args_so_far, mode, type,
1247 argpos < n_named_args);
1248 #ifdef FUNCTION_INCOMING_ARG
1249 /* If this is a sibling call and the machine has register windows, the
1250 register window has to be unwinded before calling the routine, so
1251 arguments have to go into the incoming registers. */
1252 args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type,
1253 argpos < n_named_args);
1255 args[i].tail_call_reg = args[i].reg;
1258 #ifdef FUNCTION_ARG_PARTIAL_NREGS
1261 = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type,
1262 argpos < n_named_args);
1265 args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type);
1267 /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]),
1268 it means that we are to pass this arg in the register(s) designated
1269 by the PARALLEL, but also to pass it in the stack. */
1270 if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL
1271 && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0)
1272 args[i].pass_on_stack = 1;
1274 /* If this is an addressable type, we must preallocate the stack
1275 since we must evaluate the object into its final location.
1277 If this is to be passed in both registers and the stack, it is simpler
1279 if (TREE_ADDRESSABLE (type)
1280 || (args[i].pass_on_stack && args[i].reg != 0))
1281 *must_preallocate = 1;
1283 /* If this is an addressable type, we cannot pre-evaluate it. Thus,
1284 we cannot consider this function call constant. */
1285 if (TREE_ADDRESSABLE (type))
1286 *ecf_flags &= ~(ECF_CONST | ECF_PURE);
1288 /* Compute the stack-size of this argument. */
1289 if (args[i].reg == 0 || args[i].partial != 0
1290 || reg_parm_stack_space > 0
1291 || args[i].pass_on_stack)
1292 locate_and_pad_parm (mode, type,
1293 #ifdef STACK_PARMS_IN_REG_PARM_AREA
1298 fndecl, args_size, &args[i].offset,
1299 &args[i].size, &alignment_pad);
1301 #ifndef ARGS_GROW_DOWNWARD
1302 args[i].slot_offset = *args_size;
1305 args[i].alignment_pad = alignment_pad;
1307 /* If a part of the arg was put into registers,
1308 don't include that part in the amount pushed. */
1309 if (reg_parm_stack_space == 0 && ! args[i].pass_on_stack)
1310 args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD)
1311 / (PARM_BOUNDARY / BITS_PER_UNIT)
1312 * (PARM_BOUNDARY / BITS_PER_UNIT));
1314 /* Update ARGS_SIZE, the total stack space for args so far. */
1316 args_size->constant += args[i].size.constant;
1317 if (args[i].size.var)
1319 ADD_PARM_SIZE (*args_size, args[i].size.var);
1322 /* Since the slot offset points to the bottom of the slot,
1323 we must record it after incrementing if the args grow down. */
1324 #ifdef ARGS_GROW_DOWNWARD
1325 args[i].slot_offset = *args_size;
1327 args[i].slot_offset.constant = -args_size->constant;
1329 SUB_PARM_SIZE (args[i].slot_offset, args_size->var);
1332 /* Increment ARGS_SO_FAR, which has info about which arg-registers
1333 have been used, etc. */
1335 FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type,
1336 argpos < n_named_args);
1340 /* Update ARGS_SIZE to contain the total size for the argument block.
1341 Return the original constant component of the argument block's size.
1343 REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved
1344 for arguments passed in registers. */
1347 compute_argument_block_size (reg_parm_stack_space, args_size,
1348 preferred_stack_boundary)
1349 int reg_parm_stack_space;
1350 struct args_size *args_size;
1351 int preferred_stack_boundary ATTRIBUTE_UNUSED;
1353 int unadjusted_args_size = args_size->constant;
1355 /* For accumulate outgoing args mode we don't need to align, since the frame
1356 will be already aligned. Align to STACK_BOUNDARY in order to prevent
1357 backends from generating missaligned frame sizes. */
1358 #ifdef STACK_BOUNDARY
1359 if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY)
1360 preferred_stack_boundary = STACK_BOUNDARY;
1363 /* Compute the actual size of the argument block required. The variable
1364 and constant sizes must be combined, the size may have to be rounded,
1365 and there may be a minimum required size. */
1369 args_size->var = ARGS_SIZE_TREE (*args_size);
1370 args_size->constant = 0;
1372 #ifdef PREFERRED_STACK_BOUNDARY
1373 preferred_stack_boundary /= BITS_PER_UNIT;
1374 if (preferred_stack_boundary > 1)
1376 /* We don't handle this case yet. To handle it correctly we have
1377 to add the delta, round and substract the delta.
1378 Currently no machine description requires this support. */
1379 if (stack_pointer_delta & (preferred_stack_boundary - 1))
1381 args_size->var = round_up (args_size->var, preferred_stack_boundary);
1385 if (reg_parm_stack_space > 0)
1388 = size_binop (MAX_EXPR, args_size->var,
1389 ssize_int (reg_parm_stack_space));
1391 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1392 /* The area corresponding to register parameters is not to count in
1393 the size of the block we need. So make the adjustment. */
1395 = size_binop (MINUS_EXPR, args_size->var,
1396 ssize_int (reg_parm_stack_space));
1402 #ifdef PREFERRED_STACK_BOUNDARY
1403 preferred_stack_boundary /= BITS_PER_UNIT;
1404 if (preferred_stack_boundary < 1)
1405 preferred_stack_boundary = 1;
1406 args_size->constant = (((args_size->constant
1407 + stack_pointer_delta
1408 + preferred_stack_boundary - 1)
1409 / preferred_stack_boundary
1410 * preferred_stack_boundary)
1411 - stack_pointer_delta);
1414 args_size->constant = MAX (args_size->constant,
1415 reg_parm_stack_space);
1417 #ifdef MAYBE_REG_PARM_STACK_SPACE
1418 if (reg_parm_stack_space == 0)
1419 args_size->constant = 0;
1422 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1423 args_size->constant -= reg_parm_stack_space;
1426 return unadjusted_args_size;
1429 /* Precompute parameters as needed for a function call.
1431 FLAGS is mask of ECF_* constants.
1433 NUM_ACTUALS is the number of arguments.
1435 ARGS is an array containing information for each argument; this routine
1436 fills in the INITIAL_VALUE and VALUE fields for each precomputed argument.
1440 precompute_arguments (flags, num_actuals, args)
1443 struct arg_data *args;
1447 /* If this function call is cse'able, precompute all the parameters.
1448 Note that if the parameter is constructed into a temporary, this will
1449 cause an additional copy because the parameter will be constructed
1450 into a temporary location and then copied into the outgoing arguments.
1451 If a parameter contains a call to alloca and this function uses the
1452 stack, precompute the parameter. */
1454 /* If we preallocated the stack space, and some arguments must be passed
1455 on the stack, then we must precompute any parameter which contains a
1456 function call which will store arguments on the stack.
1457 Otherwise, evaluating the parameter may clobber previous parameters
1458 which have already been stored into the stack. (we have code to avoid
1459 such case by saving the ougoing stack arguments, but it results in
1462 for (i = 0; i < num_actuals; i++)
1463 if ((flags & (ECF_CONST | ECF_PURE))
1464 || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS))
1466 /* If this is an addressable type, we cannot pre-evaluate it. */
1467 if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
1473 = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
1475 preserve_temp_slots (args[i].value);
1478 /* ANSI doesn't require a sequence point here,
1479 but PCC has one, so this will avoid some problems. */
1482 args[i].initial_value = args[i].value
1483 = protect_from_queue (args[i].value, 0);
1485 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode)
1488 = convert_modes (args[i].mode,
1489 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1490 args[i].value, args[i].unsignedp);
1491 #ifdef PROMOTE_FOR_CALL_ONLY
1492 /* CSE will replace this only if it contains args[i].value
1493 pseudo, so convert it down to the declared mode using
1495 if (GET_CODE (args[i].value) == REG
1496 && GET_MODE_CLASS (args[i].mode) == MODE_INT)
1498 args[i].initial_value
1499 = gen_rtx_SUBREG (TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1501 SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1;
1502 SUBREG_PROMOTED_UNSIGNED_P (args[i].initial_value)
1503 = args[i].unsignedp;
1510 /* Given the current state of MUST_PREALLOCATE and information about
1511 arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE,
1512 compute and return the final value for MUST_PREALLOCATE. */
1515 finalize_must_preallocate (must_preallocate, num_actuals, args, args_size)
1516 int must_preallocate;
1518 struct arg_data *args;
1519 struct args_size *args_size;
1521 /* See if we have or want to preallocate stack space.
1523 If we would have to push a partially-in-regs parm
1524 before other stack parms, preallocate stack space instead.
1526 If the size of some parm is not a multiple of the required stack
1527 alignment, we must preallocate.
1529 If the total size of arguments that would otherwise create a copy in
1530 a temporary (such as a CALL) is more than half the total argument list
1531 size, preallocation is faster.
1533 Another reason to preallocate is if we have a machine (like the m88k)
1534 where stack alignment is required to be maintained between every
1535 pair of insns, not just when the call is made. However, we assume here
1536 that such machines either do not have push insns (and hence preallocation
1537 would occur anyway) or the problem is taken care of with
1540 if (! must_preallocate)
1542 int partial_seen = 0;
1543 int copy_to_evaluate_size = 0;
1546 for (i = 0; i < num_actuals && ! must_preallocate; i++)
1548 if (args[i].partial > 0 && ! args[i].pass_on_stack)
1550 else if (partial_seen && args[i].reg == 0)
1551 must_preallocate = 1;
1553 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1554 && (TREE_CODE (args[i].tree_value) == CALL_EXPR
1555 || TREE_CODE (args[i].tree_value) == TARGET_EXPR
1556 || TREE_CODE (args[i].tree_value) == COND_EXPR
1557 || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))))
1558 copy_to_evaluate_size
1559 += int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1562 if (copy_to_evaluate_size * 2 >= args_size->constant
1563 && args_size->constant > 0)
1564 must_preallocate = 1;
1566 return must_preallocate;
1569 /* If we preallocated stack space, compute the address of each argument
1570 and store it into the ARGS array.
1572 We need not ensure it is a valid memory address here; it will be
1573 validized when it is used.
1575 ARGBLOCK is an rtx for the address of the outgoing arguments. */
1578 compute_argument_addresses (args, argblock, num_actuals)
1579 struct arg_data *args;
1585 rtx arg_reg = argblock;
1586 int i, arg_offset = 0;
1588 if (GET_CODE (argblock) == PLUS)
1589 arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1));
1591 for (i = 0; i < num_actuals; i++)
1593 rtx offset = ARGS_SIZE_RTX (args[i].offset);
1594 rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset);
1597 /* Skip this parm if it will not be passed on the stack. */
1598 if (! args[i].pass_on_stack && args[i].reg != 0)
1601 if (GET_CODE (offset) == CONST_INT)
1602 addr = plus_constant (arg_reg, INTVAL (offset));
1604 addr = gen_rtx_PLUS (Pmode, arg_reg, offset);
1606 addr = plus_constant (addr, arg_offset);
1607 args[i].stack = gen_rtx_MEM (args[i].mode, addr);
1608 set_mem_attributes (args[i].stack,
1609 TREE_TYPE (args[i].tree_value), 1);
1611 if (GET_CODE (slot_offset) == CONST_INT)
1612 addr = plus_constant (arg_reg, INTVAL (slot_offset));
1614 addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset);
1616 addr = plus_constant (addr, arg_offset);
1617 args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr);
1618 set_mem_attributes (args[i].stack_slot,
1619 TREE_TYPE (args[i].tree_value), 1);
1621 /* Function incoming arguments may overlap with sibling call
1622 outgoing arguments and we cannot allow reordering of reads
1623 from function arguments with stores to outgoing arguments
1624 of sibling calls. */
1625 MEM_ALIAS_SET (args[i].stack) = 0;
1626 MEM_ALIAS_SET (args[i].stack_slot) = 0;
1631 /* Given a FNDECL and EXP, return an rtx suitable for use as a target address
1632 in a call instruction.
1634 FNDECL is the tree node for the target function. For an indirect call
1635 FNDECL will be NULL_TREE.
1637 EXP is the CALL_EXPR for this call. */
1640 rtx_for_function_call (fndecl, exp)
1646 /* Get the function to call, in the form of RTL. */
1649 /* If this is the first use of the function, see if we need to
1650 make an external definition for it. */
1651 if (! TREE_USED (fndecl))
1653 assemble_external (fndecl);
1654 TREE_USED (fndecl) = 1;
1657 /* Get a SYMBOL_REF rtx for the function address. */
1658 funexp = XEXP (DECL_RTL (fndecl), 0);
1661 /* Generate an rtx (probably a pseudo-register) for the address. */
1666 expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
1667 pop_temp_slots (); /* FUNEXP can't be BLKmode */
1669 /* Check the function is executable. */
1670 if (current_function_check_memory_usage)
1672 #ifdef POINTERS_EXTEND_UNSIGNED
1673 /* It might be OK to convert funexp in place, but there's
1674 a lot going on between here and when it happens naturally
1675 that this seems safer. */
1676 funaddr = convert_memory_address (Pmode, funexp);
1678 emit_library_call (chkr_check_exec_libfunc, 1,
1687 /* Do the register loads required for any wholly-register parms or any
1688 parms which are passed both on the stack and in a register. Their
1689 expressions were already evaluated.
1691 Mark all register-parms as living through the call, putting these USE
1692 insns in the CALL_INSN_FUNCTION_USAGE field. */
1695 load_register_parameters (args, num_actuals, call_fusage, flags)
1696 struct arg_data *args;
1703 #ifdef LOAD_ARGS_REVERSED
1704 for (i = num_actuals - 1; i >= 0; i--)
1706 for (i = 0; i < num_actuals; i++)
1709 rtx reg = ((flags & ECF_SIBCALL)
1710 ? args[i].tail_call_reg : args[i].reg);
1711 int partial = args[i].partial;
1716 /* Set to non-negative if must move a word at a time, even if just
1717 one word (e.g, partial == 1 && mode == DFmode). Set to -1 if
1718 we just use a normal move insn. This value can be zero if the
1719 argument is a zero size structure with no fields. */
1720 nregs = (partial ? partial
1721 : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1722 ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value))
1723 + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
1726 /* Handle calls that pass values in multiple non-contiguous
1727 locations. The Irix 6 ABI has examples of this. */
1729 if (GET_CODE (reg) == PARALLEL)
1730 emit_group_load (reg, args[i].value,
1731 int_size_in_bytes (TREE_TYPE (args[i].tree_value)),
1732 TYPE_ALIGN (TREE_TYPE (args[i].tree_value)));
1734 /* If simple case, just do move. If normal partial, store_one_arg
1735 has already loaded the register for us. In all other cases,
1736 load the register(s) from memory. */
1738 else if (nregs == -1)
1739 emit_move_insn (reg, args[i].value);
1741 /* If we have pre-computed the values to put in the registers in
1742 the case of non-aligned structures, copy them in now. */
1744 else if (args[i].n_aligned_regs != 0)
1745 for (j = 0; j < args[i].n_aligned_regs; j++)
1746 emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j),
1747 args[i].aligned_regs[j]);
1749 else if (partial == 0 || args[i].pass_on_stack)
1750 move_block_to_reg (REGNO (reg),
1751 validize_mem (args[i].value), nregs,
1754 /* Handle calls that pass values in multiple non-contiguous
1755 locations. The Irix 6 ABI has examples of this. */
1756 if (GET_CODE (reg) == PARALLEL)
1757 use_group_regs (call_fusage, reg);
1758 else if (nregs == -1)
1759 use_reg (call_fusage, reg);
1761 use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs);
1766 /* Try to integrate function. See expand_inline_function for documentation
1767 about the parameters. */
1770 try_to_integrate (fndecl, actparms, target, ignore, type, structure_value_addr)
1776 rtx structure_value_addr;
1781 rtx old_stack_level = 0;
1782 int reg_parm_stack_space = 0;
1784 #ifdef REG_PARM_STACK_SPACE
1785 #ifdef MAYBE_REG_PARM_STACK_SPACE
1786 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
1788 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
1792 before_call = get_last_insn ();
1794 timevar_push (TV_INTEGRATION);
1796 temp = expand_inline_function (fndecl, actparms, target,
1798 structure_value_addr);
1800 timevar_pop (TV_INTEGRATION);
1802 /* If inlining succeeded, return. */
1803 if (temp != (rtx) (HOST_WIDE_INT) - 1)
1805 if (ACCUMULATE_OUTGOING_ARGS)
1807 /* If the outgoing argument list must be preserved, push
1808 the stack before executing the inlined function if it
1811 for (i = reg_parm_stack_space - 1; i >= 0; i--)
1812 if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0)
1815 if (stack_arg_under_construction || i >= 0)
1818 = before_call ? NEXT_INSN (before_call) : get_insns ();
1819 rtx insn = NULL_RTX, seq;
1821 /* Look for a call in the inline function code.
1822 If DECL_SAVED_INSNS (fndecl)->outgoing_args_size is
1823 nonzero then there is a call and it is not necessary
1824 to scan the insns. */
1826 if (DECL_SAVED_INSNS (fndecl)->outgoing_args_size == 0)
1827 for (insn = first_insn; insn; insn = NEXT_INSN (insn))
1828 if (GET_CODE (insn) == CALL_INSN)
1833 /* Reserve enough stack space so that the largest
1834 argument list of any function call in the inline
1835 function does not overlap the argument list being
1836 evaluated. This is usually an overestimate because
1837 allocate_dynamic_stack_space reserves space for an
1838 outgoing argument list in addition to the requested
1839 space, but there is no way to ask for stack space such
1840 that an argument list of a certain length can be
1843 Add the stack space reserved for register arguments, if
1844 any, in the inline function. What is really needed is the
1845 largest value of reg_parm_stack_space in the inline
1846 function, but that is not available. Using the current
1847 value of reg_parm_stack_space is wrong, but gives
1848 correct results on all supported machines. */
1850 int adjust = (DECL_SAVED_INSNS (fndecl)->outgoing_args_size
1851 + reg_parm_stack_space);
1854 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1855 allocate_dynamic_stack_space (GEN_INT (adjust),
1856 NULL_RTX, BITS_PER_UNIT);
1859 emit_insns_before (seq, first_insn);
1860 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1865 /* If the result is equivalent to TARGET, return TARGET to simplify
1866 checks in store_expr. They can be equivalent but not equal in the
1867 case of a function that returns BLKmode. */
1868 if (temp != target && rtx_equal_p (temp, target))
1873 /* If inlining failed, mark FNDECL as needing to be compiled
1874 separately after all. If function was declared inline,
1876 if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline
1877 && optimize > 0 && !TREE_ADDRESSABLE (fndecl))
1879 warning_with_decl (fndecl, "inlining failed in call to `%s'");
1880 warning ("called from here");
1882 mark_addressable (fndecl);
1883 return (rtx) (HOST_WIDE_INT) - 1;
1886 /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments
1887 wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY
1888 bytes, then we would need to push some additional bytes to pad the
1889 arguments. So, we compute an adjust to the stack pointer for an
1890 amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE
1891 bytes. Then, when the arguments are pushed the stack will be perfectly
1892 aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should
1893 be popped after the call. Returns the adjustment. */
1896 combine_pending_stack_adjustment_and_call (unadjusted_args_size,
1898 preferred_unit_stack_boundary)
1899 int unadjusted_args_size;
1900 struct args_size *args_size;
1901 int preferred_unit_stack_boundary;
1903 /* The number of bytes to pop so that the stack will be
1904 under-aligned by UNADJUSTED_ARGS_SIZE bytes. */
1905 HOST_WIDE_INT adjustment;
1906 /* The alignment of the stack after the arguments are pushed, if we
1907 just pushed the arguments without adjust the stack here. */
1908 HOST_WIDE_INT unadjusted_alignment;
1910 unadjusted_alignment
1911 = ((stack_pointer_delta + unadjusted_args_size)
1912 % preferred_unit_stack_boundary);
1914 /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes
1915 as possible -- leaving just enough left to cancel out the
1916 UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the
1917 PENDING_STACK_ADJUST is non-negative, and congruent to
1918 -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */
1920 /* Begin by trying to pop all the bytes. */
1921 unadjusted_alignment
1922 = (unadjusted_alignment
1923 - (pending_stack_adjust % preferred_unit_stack_boundary));
1924 adjustment = pending_stack_adjust;
1925 /* Push enough additional bytes that the stack will be aligned
1926 after the arguments are pushed. */
1927 if (preferred_unit_stack_boundary > 1)
1929 if (unadjusted_alignment >= 0)
1930 adjustment -= preferred_unit_stack_boundary - unadjusted_alignment;
1932 adjustment += unadjusted_alignment;
1935 /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of
1936 bytes after the call. The right number is the entire
1937 PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required
1938 by the arguments in the first place. */
1940 = pending_stack_adjust - adjustment + unadjusted_args_size;
1945 /* Scan X expression if it does not dereference any argument slots
1946 we already clobbered by tail call arguments (as noted in stored_args_map
1948 Return non-zero if X expression dereferences such argument slots,
1952 check_sibcall_argument_overlap_1 (x)
1963 code = GET_CODE (x);
1967 if (XEXP (x, 0) == current_function_internal_arg_pointer)
1969 else if (GET_CODE (XEXP (x, 0)) == PLUS
1970 && XEXP (XEXP (x, 0), 0) ==
1971 current_function_internal_arg_pointer
1972 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)
1973 i = INTVAL (XEXP (XEXP (x, 0), 1));
1977 #ifdef ARGS_GROW_DOWNWARD
1978 i = -i - GET_MODE_SIZE (GET_MODE (x));
1981 for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++)
1982 if (i + k < stored_args_map->n_bits
1983 && TEST_BIT (stored_args_map, i + k))
1989 /* Scan all subexpressions. */
1990 fmt = GET_RTX_FORMAT (code);
1991 for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
1995 if (check_sibcall_argument_overlap_1 (XEXP (x, i)))
1998 else if (*fmt == 'E')
2000 for (j = 0; j < XVECLEN (x, i); j++)
2001 if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j)))
2009 /* Scan sequence after INSN if it does not dereference any argument slots
2010 we already clobbered by tail call arguments (as noted in stored_args_map
2011 bitmap). Add stack slots for ARG to stored_args_map bitmap afterwards.
2012 Return non-zero if sequence after INSN dereferences such argument slots,
2016 check_sibcall_argument_overlap (insn, arg)
2018 struct arg_data *arg;
2022 if (insn == NULL_RTX)
2023 insn = get_insns ();
2025 insn = NEXT_INSN (insn);
2027 for (; insn; insn = NEXT_INSN (insn))
2028 if (INSN_P (insn) &&
2029 check_sibcall_argument_overlap_1 (PATTERN (insn)))
2032 #ifdef ARGS_GROW_DOWNWARD
2033 low = -arg->offset.constant - arg->size.constant;
2035 low = arg->offset.constant;
2038 for (high = low + arg->size.constant; low < high; low++)
2039 SET_BIT (stored_args_map, low);
2040 return insn != NULL_RTX;
2043 /* Generate all the code for a function call
2044 and return an rtx for its value.
2045 Store the value in TARGET (specified as an rtx) if convenient.
2046 If the value is stored in TARGET then TARGET is returned.
2047 If IGNORE is nonzero, then we ignore the value of the function call. */
2050 expand_call (exp, target, ignore)
2055 /* Nonzero if we are currently expanding a call. */
2056 static int currently_expanding_call = 0;
2058 /* List of actual parameters. */
2059 tree actparms = TREE_OPERAND (exp, 1);
2060 /* RTX for the function to be called. */
2062 /* Sequence of insns to perform a tail recursive "call". */
2063 rtx tail_recursion_insns = NULL_RTX;
2064 /* Sequence of insns to perform a normal "call". */
2065 rtx normal_call_insns = NULL_RTX;
2066 /* Sequence of insns to perform a tail recursive "call". */
2067 rtx tail_call_insns = NULL_RTX;
2068 /* Data type of the function. */
2070 /* Declaration of the function being called,
2071 or 0 if the function is computed (not known by name). */
2074 int try_tail_call = 1;
2075 int try_tail_recursion = 1;
2078 /* Register in which non-BLKmode value will be returned,
2079 or 0 if no value or if value is BLKmode. */
2081 /* Address where we should return a BLKmode value;
2082 0 if value not BLKmode. */
2083 rtx structure_value_addr = 0;
2084 /* Nonzero if that address is being passed by treating it as
2085 an extra, implicit first parameter. Otherwise,
2086 it is passed by being copied directly into struct_value_rtx. */
2087 int structure_value_addr_parm = 0;
2088 /* Size of aggregate value wanted, or zero if none wanted
2089 or if we are using the non-reentrant PCC calling convention
2090 or expecting the value in registers. */
2091 HOST_WIDE_INT struct_value_size = 0;
2092 /* Nonzero if called function returns an aggregate in memory PCC style,
2093 by returning the address of where to find it. */
2094 int pcc_struct_value = 0;
2096 /* Number of actual parameters in this call, including struct value addr. */
2098 /* Number of named args. Args after this are anonymous ones
2099 and they must all go on the stack. */
2102 /* Vector of information about each argument.
2103 Arguments are numbered in the order they will be pushed,
2104 not the order they are written. */
2105 struct arg_data *args;
2107 /* Total size in bytes of all the stack-parms scanned so far. */
2108 struct args_size args_size;
2109 struct args_size adjusted_args_size;
2110 /* Size of arguments before any adjustments (such as rounding). */
2111 int unadjusted_args_size;
2112 /* Data on reg parms scanned so far. */
2113 CUMULATIVE_ARGS args_so_far;
2114 /* Nonzero if a reg parm has been scanned. */
2116 /* Nonzero if this is an indirect function call. */
2118 /* Nonzero if we must avoid push-insns in the args for this call.
2119 If stack space is allocated for register parameters, but not by the
2120 caller, then it is preallocated in the fixed part of the stack frame.
2121 So the entire argument block must then be preallocated (i.e., we
2122 ignore PUSH_ROUNDING in that case). */
2124 int must_preallocate = !PUSH_ARGS;
2126 /* Size of the stack reserved for parameter registers. */
2127 int reg_parm_stack_space = 0;
2129 /* Address of space preallocated for stack parms
2130 (on machines that lack push insns), or 0 if space not preallocated. */
2133 /* Mask of ECF_ flags. */
2135 /* Nonzero if this is a call to an inline function. */
2136 int is_integrable = 0;
2137 #ifdef REG_PARM_STACK_SPACE
2138 /* Define the boundary of the register parm stack space that needs to be
2140 int low_to_save = -1, high_to_save;
2141 rtx save_area = 0; /* Place that it is saved */
2144 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
2145 char *initial_stack_usage_map = stack_usage_map;
2146 int old_stack_arg_under_construction = 0;
2148 rtx old_stack_level = 0;
2149 int old_pending_adj = 0;
2150 int old_inhibit_defer_pop = inhibit_defer_pop;
2151 int old_stack_allocated;
2153 register tree p = TREE_OPERAND (exp, 0);
2155 /* The alignment of the stack, in bits. */
2156 HOST_WIDE_INT preferred_stack_boundary;
2157 /* The alignment of the stack, in bytes. */
2158 HOST_WIDE_INT preferred_unit_stack_boundary;
2160 /* The value of the function call can be put in a hard register. But
2161 if -fcheck-memory-usage, code which invokes functions (and thus
2162 damages some hard registers) can be inserted before using the value.
2163 So, target is always a pseudo-register in that case. */
2164 if (current_function_check_memory_usage)
2167 /* See if this is "nothrow" function call. */
2168 if (TREE_NOTHROW (exp))
2169 flags |= ECF_NOTHROW;
2171 /* See if we can find a DECL-node for the actual function.
2172 As a result, decide whether this is a call to an integrable function. */
2174 fndecl = get_callee_fndecl (exp);
2178 && fndecl != current_function_decl
2179 && DECL_INLINE (fndecl)
2180 && DECL_SAVED_INSNS (fndecl)
2181 && DECL_SAVED_INSNS (fndecl)->inlinable)
2183 else if (! TREE_ADDRESSABLE (fndecl))
2185 /* In case this function later becomes inlinable,
2186 record that there was already a non-inline call to it.
2188 Use abstraction instead of setting TREE_ADDRESSABLE
2190 if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline
2193 warning_with_decl (fndecl, "can't inline call to `%s'");
2194 warning ("called from here");
2196 mark_addressable (fndecl);
2199 flags |= flags_from_decl_or_type (fndecl);
2202 /* If we don't have specific function to call, see if we have a
2203 attributes set in the type. */
2205 flags |= flags_from_decl_or_type (TREE_TYPE (TREE_TYPE (p)));
2207 /* Mark if the function returns with the stack pointer depressed. */
2208 if (TREE_CODE (TREE_TYPE (TREE_TYPE (p))) == FUNCTION_TYPE
2209 && TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (TREE_TYPE (p))))
2211 flags |= ECF_SP_DEPRESSED;
2212 flags &= ~ (ECF_PURE | ECF_CONST);
2215 #ifdef REG_PARM_STACK_SPACE
2216 #ifdef MAYBE_REG_PARM_STACK_SPACE
2217 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
2219 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
2223 #ifndef OUTGOING_REG_PARM_STACK_SPACE
2224 if (reg_parm_stack_space > 0 && PUSH_ARGS)
2225 must_preallocate = 1;
2228 /* Warn if this value is an aggregate type,
2229 regardless of which calling convention we are using for it. */
2230 if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
2231 warning ("function call has aggregate value");
2233 /* Set up a place to return a structure. */
2235 /* Cater to broken compilers. */
2236 if (aggregate_value_p (exp))
2238 /* This call returns a big structure. */
2239 flags &= ~(ECF_CONST | ECF_PURE);
2241 #ifdef PCC_STATIC_STRUCT_RETURN
2243 pcc_struct_value = 1;
2244 /* Easier than making that case work right. */
2247 /* In case this is a static function, note that it has been
2249 if (! TREE_ADDRESSABLE (fndecl))
2250 mark_addressable (fndecl);
2254 #else /* not PCC_STATIC_STRUCT_RETURN */
2256 struct_value_size = int_size_in_bytes (TREE_TYPE (exp));
2258 if (target && GET_CODE (target) == MEM)
2259 structure_value_addr = XEXP (target, 0);
2264 /* For variable-sized objects, we must be called with a target
2265 specified. If we were to allocate space on the stack here,
2266 we would have no way of knowing when to free it. */
2268 if (struct_value_size < 0)
2271 d = assign_temp (TREE_TYPE (exp), 1, 1, 1);
2272 mark_temp_addr_taken (d);
2273 structure_value_addr = XEXP (d, 0);
2277 #endif /* not PCC_STATIC_STRUCT_RETURN */
2280 /* If called function is inline, try to integrate it. */
2284 rtx temp = try_to_integrate (fndecl, actparms, target,
2285 ignore, TREE_TYPE (exp),
2286 structure_value_addr);
2287 if (temp != (rtx) (HOST_WIDE_INT) - 1)
2291 /* Figure out the amount to which the stack should be aligned. */
2292 #ifdef PREFERRED_STACK_BOUNDARY
2293 preferred_stack_boundary = PREFERRED_STACK_BOUNDARY;
2295 preferred_stack_boundary = STACK_BOUNDARY;
2298 /* Operand 0 is a pointer-to-function; get the type of the function. */
2299 funtype = TREE_TYPE (TREE_OPERAND (exp, 0));
2300 if (! POINTER_TYPE_P (funtype))
2302 funtype = TREE_TYPE (funtype);
2304 /* See if this is a call to a function that can return more than once
2305 or a call to longjmp or malloc. */
2306 flags |= special_function_p (fndecl, flags);
2308 if (flags & ECF_MAY_BE_ALLOCA)
2309 current_function_calls_alloca = 1;
2311 /* If struct_value_rtx is 0, it means pass the address
2312 as if it were an extra parameter. */
2313 if (structure_value_addr && struct_value_rtx == 0)
2315 /* If structure_value_addr is a REG other than
2316 virtual_outgoing_args_rtx, we can use always use it. If it
2317 is not a REG, we must always copy it into a register.
2318 If it is virtual_outgoing_args_rtx, we must copy it to another
2319 register in some cases. */
2320 rtx temp = (GET_CODE (structure_value_addr) != REG
2321 || (ACCUMULATE_OUTGOING_ARGS
2322 && stack_arg_under_construction
2323 && structure_value_addr == virtual_outgoing_args_rtx)
2324 ? copy_addr_to_reg (structure_value_addr)
2325 : structure_value_addr);
2328 = tree_cons (error_mark_node,
2329 make_tree (build_pointer_type (TREE_TYPE (funtype)),
2332 structure_value_addr_parm = 1;
2335 /* Count the arguments and set NUM_ACTUALS. */
2336 for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p))
2339 /* Compute number of named args.
2340 Normally, don't include the last named arg if anonymous args follow.
2341 We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero.
2342 (If no anonymous args follow, the result of list_length is actually
2343 one too large. This is harmless.)
2345 If PRETEND_OUTGOING_VARARGS_NAMED is set and STRICT_ARGUMENT_NAMING is
2346 zero, this machine will be able to place unnamed args that were
2347 passed in registers into the stack. So treat all args as named.
2348 This allows the insns emitting for a specific argument list to be
2349 independent of the function declaration.
2351 If PRETEND_OUTGOING_VARARGS_NAMED is not set, we do not have any
2352 reliable way to pass unnamed args in registers, so we must force
2353 them into memory. */
2355 if ((STRICT_ARGUMENT_NAMING
2356 || ! PRETEND_OUTGOING_VARARGS_NAMED)
2357 && TYPE_ARG_TYPES (funtype) != 0)
2359 = (list_length (TYPE_ARG_TYPES (funtype))
2360 /* Don't include the last named arg. */
2361 - (STRICT_ARGUMENT_NAMING ? 0 : 1)
2362 /* Count the struct value address, if it is passed as a parm. */
2363 + structure_value_addr_parm);
2365 /* If we know nothing, treat all args as named. */
2366 n_named_args = num_actuals;
2368 /* Start updating where the next arg would go.
2370 On some machines (such as the PA) indirect calls have a different
2371 calling convention than normal calls. The last argument in
2372 INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call
2374 INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, (fndecl == 0));
2377 /* Make a vector to hold all the information about each arg. */
2378 args = (struct arg_data *) alloca (num_actuals
2379 * sizeof (struct arg_data));
2380 bzero ((char *) args, num_actuals * sizeof (struct arg_data));
2382 /* Build up entries inthe ARGS array, compute the size of the arguments
2383 into ARGS_SIZE, etc. */
2384 initialize_argument_information (num_actuals, args, &args_size,
2385 n_named_args, actparms, fndecl,
2386 &args_so_far, reg_parm_stack_space,
2387 &old_stack_level, &old_pending_adj,
2388 &must_preallocate, &flags);
2392 /* If this function requires a variable-sized argument list, don't
2393 try to make a cse'able block for this call. We may be able to
2394 do this eventually, but it is too complicated to keep track of
2395 what insns go in the cse'able block and which don't. */
2397 flags &= ~(ECF_CONST | ECF_PURE);
2398 must_preallocate = 1;
2401 /* Now make final decision about preallocating stack space. */
2402 must_preallocate = finalize_must_preallocate (must_preallocate,
2406 /* If the structure value address will reference the stack pointer, we
2407 must stabilize it. We don't need to do this if we know that we are
2408 not going to adjust the stack pointer in processing this call. */
2410 if (structure_value_addr
2411 && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr)
2412 || reg_mentioned_p (virtual_outgoing_args_rtx,
2413 structure_value_addr))
2415 || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant)))
2416 structure_value_addr = copy_to_reg (structure_value_addr);
2418 /* Tail calls can make things harder to debug, and we're traditionally
2419 pushed these optimizations into -O2. Don't try if we're already
2420 expanding a call, as that means we're an argument. Similarly, if
2421 there's pending loops or cleanups we know there's code to follow
2424 If rtx_equal_function_value_matters is false, that means we've
2425 finished with regular parsing. Which means that some of the
2426 machinery we use to generate tail-calls is no longer in place.
2427 This is most often true of sjlj-exceptions, which we couldn't
2428 tail-call to anyway. */
2430 if (currently_expanding_call++ != 0
2431 || !flag_optimize_sibling_calls
2432 || !rtx_equal_function_value_matters
2433 || !stmt_loop_nest_empty ()
2434 || any_pending_cleanups (1)
2436 try_tail_call = try_tail_recursion = 0;
2438 /* Tail recursion fails, when we are not dealing with recursive calls. */
2439 if (!try_tail_recursion
2440 || TREE_CODE (TREE_OPERAND (exp, 0)) != ADDR_EXPR
2441 || TREE_OPERAND (TREE_OPERAND (exp, 0), 0) != current_function_decl)
2442 try_tail_recursion = 0;
2444 /* Rest of purposes for tail call optimizations to fail. */
2446 #ifdef HAVE_sibcall_epilogue
2447 !HAVE_sibcall_epilogue
2452 /* Doing sibling call optimization needs some work, since
2453 structure_value_addr can be allocated on the stack.
2454 It does not seem worth the effort since few optimizable
2455 sibling calls will return a structure. */
2456 || structure_value_addr != NULL_RTX
2457 /* If the register holding the address is a callee saved
2458 register, then we lose. We have no way to prevent that,
2459 so we only allow calls to named functions. */
2460 /* ??? This could be done by having the insn constraints
2461 use a register class that is all call-clobbered. Any
2462 reload insns generated to fix things up would appear
2463 before the sibcall_epilogue. */
2464 || fndecl == NULL_TREE
2465 || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP))
2466 || !FUNCTION_OK_FOR_SIBCALL (fndecl)
2467 /* If this function requires more stack slots than the current
2468 function, we cannot change it into a sibling call. */
2469 || args_size.constant > current_function_args_size
2470 /* If the callee pops its own arguments, then it must pop exactly
2471 the same number of arguments as the current function. */
2472 || RETURN_POPS_ARGS (fndecl, funtype, args_size.constant)
2473 != RETURN_POPS_ARGS (current_function_decl,
2474 TREE_TYPE (current_function_decl),
2475 current_function_args_size))
2478 if (try_tail_call || try_tail_recursion)
2481 actparms = NULL_TREE;
2482 /* Ok, we're going to give the tail call the old college try.
2483 This means we're going to evaluate the function arguments
2484 up to three times. There are two degrees of badness we can
2485 encounter, those that can be unsaved and those that can't.
2486 (See unsafe_for_reeval commentary for details.)
2488 Generate a new argument list. Pass safe arguments through
2489 unchanged. For the easy badness wrap them in UNSAVE_EXPRs.
2490 For hard badness, evaluate them now and put their resulting
2491 rtx in a temporary VAR_DECL.
2493 initialize_argument_information has ordered the array for the
2494 order to be pushed, and we must remember this when reconstructing
2495 the original argument orde. */
2497 if (PUSH_ARGS_REVERSED)
2506 i = num_actuals - 1;
2510 for (; i != end; i += inc)
2512 switch (unsafe_for_reeval (args[i].tree_value))
2517 case 1: /* Mildly unsafe. */
2518 args[i].tree_value = unsave_expr (args[i].tree_value);
2521 case 2: /* Wildly unsafe. */
2523 tree var = build_decl (VAR_DECL, NULL_TREE,
2524 TREE_TYPE (args[i].tree_value));
2525 DECL_RTL (var) = expand_expr (args[i].tree_value, NULL_RTX,
2526 VOIDmode, EXPAND_NORMAL);
2527 args[i].tree_value = var;
2534 /* We need to build actparms for optimize_tail_recursion. We can
2535 safely trash away TREE_PURPOSE, since it is unused by this
2537 if (try_tail_recursion)
2538 actparms = tree_cons (NULL_TREE, args[i].tree_value, actparms);
2540 /* Expanding one of those dangerous arguments could have added
2541 cleanups, but otherwise give it a whirl. */
2542 if (any_pending_cleanups (1))
2543 try_tail_call = try_tail_recursion = 0;
2546 /* Generate a tail recursion sequence when calling ourselves. */
2548 if (try_tail_recursion)
2550 /* We want to emit any pending stack adjustments before the tail
2551 recursion "call". That way we know any adjustment after the tail
2552 recursion call can be ignored if we indeed use the tail recursion
2554 int save_pending_stack_adjust = pending_stack_adjust;
2555 int save_stack_pointer_delta = stack_pointer_delta;
2557 /* Use a new sequence to hold any RTL we generate. We do not even
2558 know if we will use this RTL yet. The final decision can not be
2559 made until after RTL generation for the entire function is
2562 /* If expanding any of the arguments creates cleanups, we can't
2563 do a tailcall. So, we'll need to pop the pending cleanups
2564 list. If, however, all goes well, and there are no cleanups
2565 then the call to expand_start_target_temps will have no
2567 expand_start_target_temps ();
2568 if (optimize_tail_recursion (actparms, get_last_insn ()))
2570 if (any_pending_cleanups (1))
2571 try_tail_call = try_tail_recursion = 0;
2573 tail_recursion_insns = get_insns ();
2575 expand_end_target_temps ();
2578 /* Restore the original pending stack adjustment for the sibling and
2579 normal call cases below. */
2580 pending_stack_adjust = save_pending_stack_adjust;
2581 stack_pointer_delta = save_stack_pointer_delta;
2584 if (profile_arc_flag && (flags & ECF_FORK_OR_EXEC))
2586 /* A fork duplicates the profile information, and an exec discards
2587 it. We can't rely on fork/exec to be paired. So write out the
2588 profile information we have gathered so far, and clear it. */
2589 /* ??? When Linux's __clone is called with CLONE_VM set, profiling
2590 is subject to race conditions, just as with multithreaded
2593 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__bb_fork_func"), 0,
2597 /* Ensure current function's preferred stack boundary is at least
2598 what we need. We don't have to increase alignment for recursive
2600 if (cfun->preferred_stack_boundary < preferred_stack_boundary
2601 && fndecl != current_function_decl)
2602 cfun->preferred_stack_boundary = preferred_stack_boundary;
2604 preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT;
2606 function_call_count++;
2608 /* We want to make two insn chains; one for a sibling call, the other
2609 for a normal call. We will select one of the two chains after
2610 initial RTL generation is complete. */
2611 for (pass = 0; pass < 2; pass++)
2613 int sibcall_failure = 0;
2614 /* We want to emit ay pending stack adjustments before the tail
2615 recursion "call". That way we know any adjustment after the tail
2616 recursion call can be ignored if we indeed use the tail recursion
2618 int save_pending_stack_adjust = 0;
2619 int save_stack_pointer_delta = 0;
2621 rtx before_call, next_arg_reg;
2625 if (! try_tail_call)
2628 /* Emit any queued insns now; otherwise they would end up in
2629 only one of the alternates. */
2632 /* State variables we need to save and restore between
2634 save_pending_stack_adjust = pending_stack_adjust;
2635 save_stack_pointer_delta = stack_pointer_delta;
2638 flags &= ~ECF_SIBCALL;
2640 flags |= ECF_SIBCALL;
2642 /* Other state variables that we must reinitialize each time
2643 through the loop (that are not initialized by the loop itself). */
2647 /* Start a new sequence for the normal call case.
2649 From this point on, if the sibling call fails, we want to set
2650 sibcall_failure instead of continuing the loop. */
2655 /* We know at this point that there are not currently any
2656 pending cleanups. If, however, in the process of evaluating
2657 the arguments we were to create some, we'll need to be
2658 able to get rid of them. */
2659 expand_start_target_temps ();
2662 /* When calling a const function, we must pop the stack args right away,
2663 so that the pop is deleted or moved with the call. */
2664 if (flags & (ECF_CONST | ECF_PURE))
2667 /* Don't let pending stack adjusts add up to too much.
2668 Also, do all pending adjustments now if there is any chance
2669 this might be a call to alloca or if we are expanding a sibling
2671 if (pending_stack_adjust >= 32
2672 || (pending_stack_adjust > 0 && (flags & ECF_MAY_BE_ALLOCA))
2674 do_pending_stack_adjust ();
2676 /* Push the temporary stack slot level so that we can free any
2677 temporaries we make. */
2681 #ifdef FINAL_REG_PARM_STACK_SPACE
2682 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
2685 /* Precompute any arguments as needed. */
2687 precompute_arguments (flags, num_actuals, args);
2689 /* Now we are about to start emitting insns that can be deleted
2690 if a libcall is deleted. */
2691 if (flags & (ECF_CONST | ECF_PURE | ECF_MALLOC))
2694 adjusted_args_size = args_size;
2695 /* Compute the actual size of the argument block required. The variable
2696 and constant sizes must be combined, the size may have to be rounded,
2697 and there may be a minimum required size. When generating a sibcall
2698 pattern, do not round up, since we'll be re-using whatever space our
2700 unadjusted_args_size
2701 = compute_argument_block_size (reg_parm_stack_space, &adjusted_args_size,
2703 : preferred_stack_boundary));
2705 old_stack_allocated = stack_pointer_delta - pending_stack_adjust;
2707 /* The argument block when performing a sibling call is the
2708 incoming argument block. */
2711 argblock = virtual_incoming_args_rtx;
2712 stored_args_map = sbitmap_alloc (args_size.constant);
2713 sbitmap_zero (stored_args_map);
2716 /* If we have no actual push instructions, or shouldn't use them,
2717 make space for all args right now. */
2718 else if (adjusted_args_size.var != 0)
2720 if (old_stack_level == 0)
2722 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
2723 old_pending_adj = pending_stack_adjust;
2724 pending_stack_adjust = 0;
2725 /* stack_arg_under_construction says whether a stack arg is
2726 being constructed at the old stack level. Pushing the stack
2727 gets a clean outgoing argument block. */
2728 old_stack_arg_under_construction = stack_arg_under_construction;
2729 stack_arg_under_construction = 0;
2731 argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0);
2735 /* Note that we must go through the motions of allocating an argument
2736 block even if the size is zero because we may be storing args
2737 in the area reserved for register arguments, which may be part of
2740 int needed = adjusted_args_size.constant;
2742 /* Store the maximum argument space used. It will be pushed by
2743 the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow
2746 if (needed > current_function_outgoing_args_size)
2747 current_function_outgoing_args_size = needed;
2749 if (must_preallocate)
2751 if (ACCUMULATE_OUTGOING_ARGS)
2753 /* Since the stack pointer will never be pushed, it is
2754 possible for the evaluation of a parm to clobber
2755 something we have already written to the stack.
2756 Since most function calls on RISC machines do not use
2757 the stack, this is uncommon, but must work correctly.
2759 Therefore, we save any area of the stack that was already
2760 written and that we are using. Here we set up to do this
2761 by making a new stack usage map from the old one. The
2762 actual save will be done by store_one_arg.
2764 Another approach might be to try to reorder the argument
2765 evaluations to avoid this conflicting stack usage. */
2767 #ifndef OUTGOING_REG_PARM_STACK_SPACE
2768 /* Since we will be writing into the entire argument area,
2769 the map must be allocated for its entire size, not just
2770 the part that is the responsibility of the caller. */
2771 needed += reg_parm_stack_space;
2774 #ifdef ARGS_GROW_DOWNWARD
2775 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2778 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2782 = (char *) alloca (highest_outgoing_arg_in_use);
2784 if (initial_highest_arg_in_use)
2785 bcopy (initial_stack_usage_map, stack_usage_map,
2786 initial_highest_arg_in_use);
2788 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
2789 bzero (&stack_usage_map[initial_highest_arg_in_use],
2790 (highest_outgoing_arg_in_use
2791 - initial_highest_arg_in_use));
2794 /* The address of the outgoing argument list must not be
2795 copied to a register here, because argblock would be left
2796 pointing to the wrong place after the call to
2797 allocate_dynamic_stack_space below. */
2799 argblock = virtual_outgoing_args_rtx;
2803 if (inhibit_defer_pop == 0)
2805 /* Try to reuse some or all of the pending_stack_adjust
2806 to get this space. */
2808 = (combine_pending_stack_adjustment_and_call
2809 (unadjusted_args_size,
2810 &adjusted_args_size,
2811 preferred_unit_stack_boundary));
2813 /* combine_pending_stack_adjustment_and_call computes
2814 an adjustment before the arguments are allocated.
2815 Account for them and see whether or not the stack
2816 needs to go up or down. */
2817 needed = unadjusted_args_size - needed;
2821 /* We're releasing stack space. */
2822 /* ??? We can avoid any adjustment at all if we're
2823 already aligned. FIXME. */
2824 pending_stack_adjust = -needed;
2825 do_pending_stack_adjust ();
2829 /* We need to allocate space. We'll do that in
2830 push_block below. */
2831 pending_stack_adjust = 0;
2834 /* Special case this because overhead of `push_block' in
2835 this case is non-trivial. */
2837 argblock = virtual_outgoing_args_rtx;
2839 argblock = push_block (GEN_INT (needed), 0, 0);
2841 /* We only really need to call `copy_to_reg' in the case
2842 where push insns are going to be used to pass ARGBLOCK
2843 to a function call in ARGS. In that case, the stack
2844 pointer changes value from the allocation point to the
2845 call point, and hence the value of
2846 VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might
2847 as well always do it. */
2848 argblock = copy_to_reg (argblock);
2850 /* The save/restore code in store_one_arg handles all
2851 cases except one: a constructor call (including a C
2852 function returning a BLKmode struct) to initialize
2854 if (stack_arg_under_construction)
2856 #ifndef OUTGOING_REG_PARM_STACK_SPACE
2857 rtx push_size = GEN_INT (reg_parm_stack_space
2858 + adjusted_args_size.constant);
2860 rtx push_size = GEN_INT (adjusted_args_size.constant);
2862 if (old_stack_level == 0)
2864 emit_stack_save (SAVE_BLOCK, &old_stack_level,
2866 old_pending_adj = pending_stack_adjust;
2867 pending_stack_adjust = 0;
2868 /* stack_arg_under_construction says whether a stack
2869 arg is being constructed at the old stack level.
2870 Pushing the stack gets a clean outgoing argument
2872 old_stack_arg_under_construction
2873 = stack_arg_under_construction;
2874 stack_arg_under_construction = 0;
2875 /* Make a new map for the new argument list. */
2876 stack_usage_map = (char *)
2877 alloca (highest_outgoing_arg_in_use);
2878 bzero (stack_usage_map, highest_outgoing_arg_in_use);
2879 highest_outgoing_arg_in_use = 0;
2881 allocate_dynamic_stack_space (push_size, NULL_RTX,
2884 /* If argument evaluation might modify the stack pointer,
2885 copy the address of the argument list to a register. */
2886 for (i = 0; i < num_actuals; i++)
2887 if (args[i].pass_on_stack)
2889 argblock = copy_addr_to_reg (argblock);
2896 compute_argument_addresses (args, argblock, num_actuals);
2898 #ifdef PREFERRED_STACK_BOUNDARY
2899 /* If we push args individually in reverse order, perform stack alignment
2900 before the first push (the last arg). */
2901 if (PUSH_ARGS_REVERSED && argblock == 0
2902 && adjusted_args_size.constant != unadjusted_args_size)
2904 /* When the stack adjustment is pending, we get better code
2905 by combining the adjustments. */
2906 if (pending_stack_adjust
2907 && ! (flags & (ECF_CONST | ECF_PURE))
2908 && ! inhibit_defer_pop)
2910 pending_stack_adjust
2911 = (combine_pending_stack_adjustment_and_call
2912 (unadjusted_args_size,
2913 &adjusted_args_size,
2914 preferred_unit_stack_boundary));
2915 do_pending_stack_adjust ();
2917 else if (argblock == 0)
2918 anti_adjust_stack (GEN_INT (adjusted_args_size.constant
2919 - unadjusted_args_size));
2921 /* Now that the stack is properly aligned, pops can't safely
2922 be deferred during the evaluation of the arguments. */
2926 /* Don't try to defer pops if preallocating, not even from the first arg,
2927 since ARGBLOCK probably refers to the SP. */
2931 funexp = rtx_for_function_call (fndecl, exp);
2933 /* Figure out the register where the value, if any, will come back. */
2935 if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode
2936 && ! structure_value_addr)
2938 if (pcc_struct_value)
2939 valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)),
2940 fndecl, (pass == 0));
2942 valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0));
2945 /* Precompute all register parameters. It isn't safe to compute anything
2946 once we have started filling any specific hard regs. */
2947 precompute_register_parameters (num_actuals, args, ®_parm_seen);
2949 #ifdef REG_PARM_STACK_SPACE
2950 /* Save the fixed argument area if it's part of the caller's frame and
2951 is clobbered by argument setup for this call. */
2952 if (ACCUMULATE_OUTGOING_ARGS && pass)
2953 save_area = save_fixed_argument_area (reg_parm_stack_space, argblock,
2954 &low_to_save, &high_to_save);
2957 /* Now store (and compute if necessary) all non-register parms.
2958 These come before register parms, since they can require block-moves,
2959 which could clobber the registers used for register parms.
2960 Parms which have partial registers are not stored here,
2961 but we do preallocate space here if they want that. */
2963 for (i = 0; i < num_actuals; i++)
2964 if (args[i].reg == 0 || args[i].pass_on_stack)
2966 rtx before_arg = get_last_insn ();
2968 if (store_one_arg (&args[i], argblock, flags,
2969 adjusted_args_size.var != 0,
2970 reg_parm_stack_space)
2972 && check_sibcall_argument_overlap (before_arg,
2974 sibcall_failure = 1;
2977 /* If we have a parm that is passed in registers but not in memory
2978 and whose alignment does not permit a direct copy into registers,
2979 make a group of pseudos that correspond to each register that we
2981 if (STRICT_ALIGNMENT)
2982 store_unaligned_arguments_into_pseudos (args, num_actuals);
2984 /* Now store any partially-in-registers parm.
2985 This is the last place a block-move can happen. */
2987 for (i = 0; i < num_actuals; i++)
2988 if (args[i].partial != 0 && ! args[i].pass_on_stack)
2990 rtx before_arg = get_last_insn ();
2992 if (store_one_arg (&args[i], argblock, flags,
2993 adjusted_args_size.var != 0,
2994 reg_parm_stack_space)
2996 && check_sibcall_argument_overlap (before_arg,
2998 sibcall_failure = 1;
3001 #ifdef PREFERRED_STACK_BOUNDARY
3002 /* If we pushed args in forward order, perform stack alignment
3003 after pushing the last arg. */
3004 if (!PUSH_ARGS_REVERSED && argblock == 0)
3005 anti_adjust_stack (GEN_INT (adjusted_args_size.constant
3006 - unadjusted_args_size));
3009 /* If register arguments require space on the stack and stack space
3010 was not preallocated, allocate stack space here for arguments
3011 passed in registers. */
3012 #ifdef OUTGOING_REG_PARM_STACK_SPACE
3013 if (!ACCUMULATE_OUTGOING_ARGS
3014 && must_preallocate == 0 && reg_parm_stack_space > 0)
3015 anti_adjust_stack (GEN_INT (reg_parm_stack_space));
3018 /* Pass the function the address in which to return a
3020 if (pass != 0 && structure_value_addr && ! structure_value_addr_parm)
3022 emit_move_insn (struct_value_rtx,
3024 force_operand (structure_value_addr,
3027 /* Mark the memory for the aggregate as write-only. */
3028 if (current_function_check_memory_usage)
3029 emit_library_call (chkr_set_right_libfunc, 1,
3031 structure_value_addr, ptr_mode,
3032 GEN_INT (struct_value_size),
3033 TYPE_MODE (sizetype),
3034 GEN_INT (MEMORY_USE_WO),
3035 TYPE_MODE (integer_type_node));
3037 if (GET_CODE (struct_value_rtx) == REG)
3038 use_reg (&call_fusage, struct_value_rtx);
3041 funexp = prepare_call_address (funexp, fndecl, &call_fusage,
3044 load_register_parameters (args, num_actuals, &call_fusage, flags);
3046 /* Perform postincrements before actually calling the function. */
3049 /* Save a pointer to the last insn before the call, so that we can
3050 later safely search backwards to find the CALL_INSN. */
3051 before_call = get_last_insn ();
3053 /* Set up next argument register. For sibling calls on machines
3054 with register windows this should be the incoming register. */
3055 #ifdef FUNCTION_INCOMING_ARG
3057 next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode,
3061 next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode,
3064 /* All arguments and registers used for the call must be set up by
3067 #ifdef PREFERRED_STACK_BOUNDARY
3068 /* Stack must be properly aligned now. */
3069 if (pass && stack_pointer_delta % preferred_unit_stack_boundary)
3073 /* Generate the actual call instruction. */
3074 emit_call_1 (funexp, fndecl, funtype, unadjusted_args_size,
3075 adjusted_args_size.constant, struct_value_size,
3076 next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage,
3079 /* Verify that we've deallocated all the stack we used. */
3081 && old_stack_allocated != stack_pointer_delta - pending_stack_adjust)
3084 /* If call is cse'able, make appropriate pair of reg-notes around it.
3085 Test valreg so we don't crash; may safely ignore `const'
3086 if return type is void. Disable for PARALLEL return values, because
3087 we have no way to move such values into a pseudo register. */
3089 && (flags & (ECF_CONST | ECF_PURE))
3090 && valreg != 0 && GET_CODE (valreg) != PARALLEL)
3093 rtx temp = gen_reg_rtx (GET_MODE (valreg));
3096 /* Mark the return value as a pointer if needed. */
3097 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
3098 mark_reg_pointer (temp, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))));
3100 /* Construct an "equal form" for the value which mentions all the
3101 arguments in order as well as the function name. */
3102 for (i = 0; i < num_actuals; i++)
3103 note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note);
3104 note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note);
3106 insns = get_insns ();
3109 if (flags & ECF_PURE)
3110 note = gen_rtx_EXPR_LIST (VOIDmode,
3111 gen_rtx_USE (VOIDmode,
3112 gen_rtx_MEM (BLKmode,
3113 gen_rtx_SCRATCH (VOIDmode))), note);
3115 emit_libcall_block (insns, temp, valreg, note);
3119 else if (flags & (ECF_CONST | ECF_PURE))
3121 /* Otherwise, just write out the sequence without a note. */
3122 rtx insns = get_insns ();
3127 else if (flags & ECF_MALLOC)
3129 rtx temp = gen_reg_rtx (GET_MODE (valreg));
3132 /* The return value from a malloc-like function is a pointer. */
3133 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
3134 mark_reg_pointer (temp, BIGGEST_ALIGNMENT);
3136 emit_move_insn (temp, valreg);
3138 /* The return value from a malloc-like function can not alias
3140 last = get_last_insn ();
3142 gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last));
3144 /* Write out the sequence. */
3145 insns = get_insns ();
3151 /* For calls to `setjmp', etc., inform flow.c it should complain
3152 if nonvolatile values are live. For functions that cannot return,
3153 inform flow that control does not fall through. */
3155 if ((flags & (ECF_RETURNS_TWICE | ECF_NORETURN | ECF_LONGJMP)) || pass == 0)
3157 /* The barrier or NOTE_INSN_SETJMP note must be emitted
3158 immediately after the CALL_INSN. Some ports emit more
3159 than just a CALL_INSN above, so we must search for it here. */
3161 rtx last = get_last_insn ();
3162 while (GET_CODE (last) != CALL_INSN)
3164 last = PREV_INSN (last);
3165 /* There was no CALL_INSN? */
3166 if (last == before_call)
3170 if (flags & ECF_RETURNS_TWICE)
3172 emit_note_after (NOTE_INSN_SETJMP, last);
3173 current_function_calls_setjmp = 1;
3176 emit_barrier_after (last);
3179 if (flags & ECF_LONGJMP)
3180 current_function_calls_longjmp = 1;
3182 /* If this function is returning into a memory location marked as
3183 readonly, it means it is initializing that location. But we normally
3184 treat functions as not clobbering such locations, so we need to
3185 specify that this one does. */
3186 if (target != 0 && GET_CODE (target) == MEM
3187 && structure_value_addr != 0 && RTX_UNCHANGING_P (target))
3188 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
3190 /* If value type not void, return an rtx for the value. */
3192 /* If there are cleanups to be called, don't use a hard reg as target.
3193 We need to double check this and see if it matters anymore. */
3194 if (any_pending_cleanups (1))
3196 if (target && REG_P (target)
3197 && REGNO (target) < FIRST_PSEUDO_REGISTER)
3199 sibcall_failure = 1;
3202 if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode
3205 target = const0_rtx;
3207 else if (structure_value_addr)
3209 if (target == 0 || GET_CODE (target) != MEM)
3212 = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
3213 memory_address (TYPE_MODE (TREE_TYPE (exp)),
3214 structure_value_addr));
3215 set_mem_attributes (target, exp, 1);
3218 else if (pcc_struct_value)
3220 /* This is the special C++ case where we need to
3221 know what the true target was. We take care to
3222 never use this value more than once in one expression. */
3223 target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
3224 copy_to_reg (valreg));
3225 set_mem_attributes (target, exp, 1);
3227 /* Handle calls that return values in multiple non-contiguous locations.
3228 The Irix 6 ABI has examples of this. */
3229 else if (GET_CODE (valreg) == PARALLEL)
3231 int bytes = int_size_in_bytes (TREE_TYPE (exp));
3235 target = assign_stack_temp (TYPE_MODE (TREE_TYPE (exp)),
3237 MEM_SET_IN_STRUCT_P (target, AGGREGATE_TYPE_P (TREE_TYPE (exp)));
3238 preserve_temp_slots (target);
3241 if (! rtx_equal_p (target, valreg))
3242 emit_group_store (target, valreg, bytes,
3243 TYPE_ALIGN (TREE_TYPE (exp)));
3245 /* We can not support sibling calls for this case. */
3246 sibcall_failure = 1;
3249 && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp))
3250 && GET_MODE (target) == GET_MODE (valreg))
3252 /* TARGET and VALREG cannot be equal at this point because the
3253 latter would not have REG_FUNCTION_VALUE_P true, while the
3254 former would if it were referring to the same register.
3256 If they refer to the same register, this move will be a no-op,
3257 except when function inlining is being done. */
3258 emit_move_insn (target, valreg);
3260 else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
3261 target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp));
3263 target = copy_to_reg (valreg);
3265 #ifdef PROMOTE_FUNCTION_RETURN
3266 /* If we promoted this return value, make the proper SUBREG. TARGET
3267 might be const0_rtx here, so be careful. */
3268 if (GET_CODE (target) == REG
3269 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
3270 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
3272 tree type = TREE_TYPE (exp);
3273 int unsignedp = TREE_UNSIGNED (type);
3275 /* If we don't promote as expected, something is wrong. */
3276 if (GET_MODE (target)
3277 != promote_mode (type, TYPE_MODE (type), &unsignedp, 1))
3280 target = gen_rtx_SUBREG (TYPE_MODE (type), target, 0);
3281 SUBREG_PROMOTED_VAR_P (target) = 1;
3282 SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp;
3286 /* If size of args is variable or this was a constructor call for a stack
3287 argument, restore saved stack-pointer value. */
3289 if (old_stack_level && ! (flags & ECF_SP_DEPRESSED))
3291 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
3292 pending_stack_adjust = old_pending_adj;
3293 stack_arg_under_construction = old_stack_arg_under_construction;
3294 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
3295 stack_usage_map = initial_stack_usage_map;
3296 sibcall_failure = 1;
3298 else if (ACCUMULATE_OUTGOING_ARGS && pass)
3300 #ifdef REG_PARM_STACK_SPACE
3303 restore_fixed_argument_area (save_area, argblock,
3304 high_to_save, low_to_save);
3308 /* If we saved any argument areas, restore them. */
3309 for (i = 0; i < num_actuals; i++)
3310 if (args[i].save_area)
3312 enum machine_mode save_mode = GET_MODE (args[i].save_area);
3314 = gen_rtx_MEM (save_mode,
3315 memory_address (save_mode,
3316 XEXP (args[i].stack_slot, 0)));
3318 if (save_mode != BLKmode)
3319 emit_move_insn (stack_area, args[i].save_area);
3321 emit_block_move (stack_area,
3322 validize_mem (args[i].save_area),
3323 GEN_INT (args[i].size.constant),
3327 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
3328 stack_usage_map = initial_stack_usage_map;
3331 /* If this was alloca, record the new stack level for nonlocal gotos.
3332 Check for the handler slots since we might not have a save area
3333 for non-local gotos. */
3335 if ((flags & ECF_MAY_BE_ALLOCA) && nonlocal_goto_handler_slots != 0)
3336 emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX);
3340 /* Free up storage we no longer need. */
3341 for (i = 0; i < num_actuals; ++i)
3342 if (args[i].aligned_regs)
3343 free (args[i].aligned_regs);
3347 /* Undo the fake expand_start_target_temps we did earlier. If
3348 there had been any cleanups created, we've already set
3350 expand_end_target_temps ();
3353 insns = get_insns ();
3358 tail_call_insns = insns;
3360 /* If something prevents making this a sibling call,
3361 zero out the sequence. */
3362 if (sibcall_failure)
3363 tail_call_insns = NULL_RTX;
3364 /* Restore the pending stack adjustment now that we have
3365 finished generating the sibling call sequence. */
3367 pending_stack_adjust = save_pending_stack_adjust;
3368 stack_pointer_delta = save_stack_pointer_delta;
3370 /* Prepare arg structure for next iteration. */
3371 for (i = 0 ; i < num_actuals ; i++)
3374 args[i].aligned_regs = 0;
3378 sbitmap_free (stored_args_map);
3381 normal_call_insns = insns;
3384 /* The function optimize_sibling_and_tail_recursive_calls doesn't
3385 handle CALL_PLACEHOLDERs inside other CALL_PLACEHOLDERs. This
3386 can happen if the arguments to this function call an inline
3387 function who's expansion contains another CALL_PLACEHOLDER.
3389 If there are any C_Ps in any of these sequences, replace them
3390 with their normal call. */
3392 for (insn = normal_call_insns; insn; insn = NEXT_INSN (insn))
3393 if (GET_CODE (insn) == CALL_INSN
3394 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
3395 replace_call_placeholder (insn, sibcall_use_normal);
3397 for (insn = tail_call_insns; insn; insn = NEXT_INSN (insn))
3398 if (GET_CODE (insn) == CALL_INSN
3399 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
3400 replace_call_placeholder (insn, sibcall_use_normal);
3402 for (insn = tail_recursion_insns; insn; insn = NEXT_INSN (insn))
3403 if (GET_CODE (insn) == CALL_INSN
3404 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
3405 replace_call_placeholder (insn, sibcall_use_normal);
3407 /* If this was a potential tail recursion site, then emit a
3408 CALL_PLACEHOLDER with the normal and the tail recursion streams.
3409 One of them will be selected later. */
3410 if (tail_recursion_insns || tail_call_insns)
3412 /* The tail recursion label must be kept around. We could expose
3413 its use in the CALL_PLACEHOLDER, but that creates unwanted edges
3414 and makes determining true tail recursion sites difficult.
3416 So we set LABEL_PRESERVE_P here, then clear it when we select
3417 one of the call sequences after rtl generation is complete. */
3418 if (tail_recursion_insns)
3419 LABEL_PRESERVE_P (tail_recursion_label) = 1;
3420 emit_call_insn (gen_rtx_CALL_PLACEHOLDER (VOIDmode, normal_call_insns,
3422 tail_recursion_insns,
3423 tail_recursion_label));
3426 emit_insns (normal_call_insns);
3428 currently_expanding_call--;
3430 /* If this function returns with the stack pointer depressed, ensure
3431 this block saves and restores the stack pointer, show it was
3432 changed, and adjust for any outgoing arg space. */
3433 if (flags & ECF_SP_DEPRESSED)
3435 clear_pending_stack_adjust ();
3436 emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx));
3437 emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx);
3438 save_stack_pointer ();
3444 /* Returns nonzero if FUN is the symbol for a library function which can
3448 libfunc_nothrow (fun)
3451 if (fun == throw_libfunc
3452 || fun == rethrow_libfunc
3453 || fun == sjthrow_libfunc
3454 || fun == sjpopnthrow_libfunc)
3460 /* Output a library call to function FUN (a SYMBOL_REF rtx).
3461 The RETVAL parameter specifies whether return value needs to be saved, other
3462 parameters are documented in the emit_library_call function bellow. */
3464 emit_library_call_value_1 (retval, orgfun, value, fn_type, outmode, nargs, p)
3469 enum machine_mode outmode;
3473 /* Total size in bytes of all the stack-parms scanned so far. */
3474 struct args_size args_size;
3475 /* Size of arguments before any adjustments (such as rounding). */
3476 struct args_size original_args_size;
3477 register int argnum;
3481 struct args_size alignment_pad;
3483 CUMULATIVE_ARGS args_so_far;
3484 struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
3485 struct args_size offset; struct args_size size; rtx save_area; };
3487 int old_inhibit_defer_pop = inhibit_defer_pop;
3488 rtx call_fusage = 0;
3491 int pcc_struct_value = 0;
3492 int struct_value_size = 0;
3494 int reg_parm_stack_space = 0;
3497 #ifdef REG_PARM_STACK_SPACE
3498 /* Define the boundary of the register parm stack space that needs to be
3500 int low_to_save = -1, high_to_save = 0;
3501 rtx save_area = 0; /* Place that it is saved */
3504 /* Size of the stack reserved for parameter registers. */
3505 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
3506 char *initial_stack_usage_map = stack_usage_map;
3508 #ifdef REG_PARM_STACK_SPACE
3509 #ifdef MAYBE_REG_PARM_STACK_SPACE
3510 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
3512 reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0);
3518 else if (fn_type == 2)
3522 if (libfunc_nothrow (fun))
3523 flags |= ECF_NOTHROW;
3525 #ifdef PREFERRED_STACK_BOUNDARY
3526 /* Ensure current function's preferred stack boundary is at least
3528 if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY)
3529 cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY;
3532 /* If this kind of value comes back in memory,
3533 decide where in memory it should come back. */
3534 if (outmode != VOIDmode && aggregate_value_p (type_for_mode (outmode, 0)))
3536 #ifdef PCC_STATIC_STRUCT_RETURN
3538 = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)),
3540 mem_value = gen_rtx_MEM (outmode, pointer_reg);
3541 pcc_struct_value = 1;
3543 value = gen_reg_rtx (outmode);
3544 #else /* not PCC_STATIC_STRUCT_RETURN */
3545 struct_value_size = GET_MODE_SIZE (outmode);
3546 if (value != 0 && GET_CODE (value) == MEM)
3549 mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0);
3552 /* This call returns a big structure. */
3553 flags &= ~(ECF_CONST | ECF_PURE);
3556 /* ??? Unfinished: must pass the memory address as an argument. */
3558 /* Copy all the libcall-arguments out of the varargs data
3559 and into a vector ARGVEC.
3561 Compute how to pass each argument. We only support a very small subset
3562 of the full argument passing conventions to limit complexity here since
3563 library functions shouldn't have many args. */
3565 argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg));
3566 bzero ((char *) argvec, (nargs + 1) * sizeof (struct arg));
3568 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
3570 args_size.constant = 0;
3575 /* Now we are about to start emitting insns that can be deleted
3576 if a libcall is deleted. */
3577 if (flags & (ECF_CONST | ECF_PURE))
3582 /* If there's a structure value address to be passed,
3583 either pass it in the special place, or pass it as an extra argument. */
3584 if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value)
3586 rtx addr = XEXP (mem_value, 0);
3589 /* Make sure it is a reasonable operand for a move or push insn. */
3590 if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM
3591 && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr)))
3592 addr = force_operand (addr, NULL_RTX);
3594 argvec[count].value = addr;
3595 argvec[count].mode = Pmode;
3596 argvec[count].partial = 0;
3598 argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1);
3599 #ifdef FUNCTION_ARG_PARTIAL_NREGS
3600 if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1))
3604 locate_and_pad_parm (Pmode, NULL_TREE,
3605 #ifdef STACK_PARMS_IN_REG_PARM_AREA
3608 argvec[count].reg != 0,
3610 NULL_TREE, &args_size, &argvec[count].offset,
3611 &argvec[count].size, &alignment_pad);
3614 if (argvec[count].reg == 0 || argvec[count].partial != 0
3615 || reg_parm_stack_space > 0)
3616 args_size.constant += argvec[count].size.constant;
3618 FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1);
3623 for (; count < nargs; count++)
3625 rtx val = va_arg (p, rtx);
3626 enum machine_mode mode = va_arg (p, enum machine_mode);
3628 /* We cannot convert the arg value to the mode the library wants here;
3629 must do it earlier where we know the signedness of the arg. */
3631 || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
3634 /* On some machines, there's no way to pass a float to a library fcn.
3635 Pass it as a double instead. */
3636 #ifdef LIBGCC_NEEDS_DOUBLE
3637 if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
3638 val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode;
3641 /* There's no need to call protect_from_queue, because
3642 either emit_move_insn or emit_push_insn will do that. */
3644 /* Make sure it is a reasonable operand for a move or push insn. */
3645 if (GET_CODE (val) != REG && GET_CODE (val) != MEM
3646 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
3647 val = force_operand (val, NULL_RTX);
3649 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
3650 if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
3652 /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can
3653 be viewed as just an efficiency improvement. */
3654 rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0);
3655 emit_move_insn (slot, val);
3656 val = force_operand (XEXP (slot, 0), NULL_RTX);
3661 argvec[count].value = val;
3662 argvec[count].mode = mode;
3664 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
3666 #ifdef FUNCTION_ARG_PARTIAL_NREGS
3667 argvec[count].partial
3668 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
3670 argvec[count].partial = 0;
3673 locate_and_pad_parm (mode, NULL_TREE,
3674 #ifdef STACK_PARMS_IN_REG_PARM_AREA
3677 argvec[count].reg != 0,
3679 NULL_TREE, &args_size, &argvec[count].offset,
3680 &argvec[count].size, &alignment_pad);
3682 if (argvec[count].size.var)
3685 if (reg_parm_stack_space == 0 && argvec[count].partial)
3686 argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
3688 if (argvec[count].reg == 0 || argvec[count].partial != 0
3689 || reg_parm_stack_space > 0)
3690 args_size.constant += argvec[count].size.constant;
3692 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1);
3695 #ifdef FINAL_REG_PARM_STACK_SPACE
3696 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
3699 /* If this machine requires an external definition for library
3700 functions, write one out. */
3701 assemble_external_libcall (fun);
3703 original_args_size = args_size;
3704 #ifdef PREFERRED_STACK_BOUNDARY
3705 args_size.constant = (((args_size.constant
3706 + stack_pointer_delta
3710 - stack_pointer_delta);
3713 args_size.constant = MAX (args_size.constant,
3714 reg_parm_stack_space);
3716 #ifndef OUTGOING_REG_PARM_STACK_SPACE
3717 args_size.constant -= reg_parm_stack_space;
3720 if (args_size.constant > current_function_outgoing_args_size)
3721 current_function_outgoing_args_size = args_size.constant;
3723 if (ACCUMULATE_OUTGOING_ARGS)
3725 /* Since the stack pointer will never be pushed, it is possible for
3726 the evaluation of a parm to clobber something we have already
3727 written to the stack. Since most function calls on RISC machines
3728 do not use the stack, this is uncommon, but must work correctly.
3730 Therefore, we save any area of the stack that was already written
3731 and that we are using. Here we set up to do this by making a new
3732 stack usage map from the old one.
3734 Another approach might be to try to reorder the argument
3735 evaluations to avoid this conflicting stack usage. */
3737 needed = args_size.constant;
3739 #ifndef OUTGOING_REG_PARM_STACK_SPACE
3740 /* Since we will be writing into the entire argument area, the
3741 map must be allocated for its entire size, not just the part that
3742 is the responsibility of the caller. */
3743 needed += reg_parm_stack_space;
3746 #ifdef ARGS_GROW_DOWNWARD
3747 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3750 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3753 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
3755 if (initial_highest_arg_in_use)
3756 bcopy (initial_stack_usage_map, stack_usage_map,
3757 initial_highest_arg_in_use);
3759 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
3760 bzero (&stack_usage_map[initial_highest_arg_in_use],
3761 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
3764 /* The address of the outgoing argument list must not be copied to a
3765 register here, because argblock would be left pointing to the
3766 wrong place after the call to allocate_dynamic_stack_space below.
3769 argblock = virtual_outgoing_args_rtx;
3774 argblock = push_block (GEN_INT (args_size.constant), 0, 0);
3777 #ifdef PREFERRED_STACK_BOUNDARY
3778 /* If we push args individually in reverse order, perform stack alignment
3779 before the first push (the last arg). */
3780 if (argblock == 0 && PUSH_ARGS_REVERSED)
3781 anti_adjust_stack (GEN_INT (args_size.constant
3782 - original_args_size.constant));
3785 if (PUSH_ARGS_REVERSED)
3796 #ifdef REG_PARM_STACK_SPACE
3797 if (ACCUMULATE_OUTGOING_ARGS)
3799 /* The argument list is the property of the called routine and it
3800 may clobber it. If the fixed area has been used for previous
3801 parameters, we must save and restore it.
3803 Here we compute the boundary of the that needs to be saved, if any. */
3805 #ifdef ARGS_GROW_DOWNWARD
3806 for (count = 0; count < reg_parm_stack_space + 1; count++)
3808 for (count = 0; count < reg_parm_stack_space; count++)
3811 if (count >= highest_outgoing_arg_in_use
3812 || stack_usage_map[count] == 0)
3815 if (low_to_save == -1)
3816 low_to_save = count;
3818 high_to_save = count;
3821 if (low_to_save >= 0)
3823 int num_to_save = high_to_save - low_to_save + 1;
3824 enum machine_mode save_mode
3825 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
3828 /* If we don't have the required alignment, must do this in BLKmode. */
3829 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
3830 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
3831 save_mode = BLKmode;
3833 #ifdef ARGS_GROW_DOWNWARD
3834 stack_area = gen_rtx_MEM (save_mode,
3835 memory_address (save_mode,
3836 plus_constant (argblock,
3839 stack_area = gen_rtx_MEM (save_mode,
3840 memory_address (save_mode,
3841 plus_constant (argblock,
3844 if (save_mode == BLKmode)
3846 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
3847 emit_block_move (validize_mem (save_area), stack_area,
3848 GEN_INT (num_to_save), PARM_BOUNDARY);
3852 save_area = gen_reg_rtx (save_mode);
3853 emit_move_insn (save_area, stack_area);
3859 /* Push the args that need to be pushed. */
3861 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3862 are to be pushed. */
3863 for (count = 0; count < nargs; count++, argnum += inc)
3865 register enum machine_mode mode = argvec[argnum].mode;
3866 register rtx val = argvec[argnum].value;
3867 rtx reg = argvec[argnum].reg;
3868 int partial = argvec[argnum].partial;
3869 int lower_bound = 0, upper_bound = 0, i;
3871 if (! (reg != 0 && partial == 0))
3873 if (ACCUMULATE_OUTGOING_ARGS)
3875 /* If this is being stored into a pre-allocated, fixed-size,
3876 stack area, save any previous data at that location. */
3878 #ifdef ARGS_GROW_DOWNWARD
3879 /* stack_slot is negative, but we want to index stack_usage_map
3880 with positive values. */
3881 upper_bound = -argvec[argnum].offset.constant + 1;
3882 lower_bound = upper_bound - argvec[argnum].size.constant;
3884 lower_bound = argvec[argnum].offset.constant;
3885 upper_bound = lower_bound + argvec[argnum].size.constant;
3888 for (i = lower_bound; i < upper_bound; i++)
3889 if (stack_usage_map[i]
3890 /* Don't store things in the fixed argument area at this
3891 point; it has already been saved. */
3892 && i > reg_parm_stack_space)
3895 if (i != upper_bound)
3897 /* We need to make a save area. See what mode we can make
3899 enum machine_mode save_mode
3900 = mode_for_size (argvec[argnum].size.constant
3908 plus_constant (argblock,
3909 argvec[argnum].offset.constant)));
3910 argvec[argnum].save_area = gen_reg_rtx (save_mode);
3912 emit_move_insn (argvec[argnum].save_area, stack_area);
3916 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
3917 argblock, GEN_INT (argvec[argnum].offset.constant),
3918 reg_parm_stack_space, ARGS_SIZE_RTX (alignment_pad));
3920 /* Now mark the segment we just used. */
3921 if (ACCUMULATE_OUTGOING_ARGS)
3922 for (i = lower_bound; i < upper_bound; i++)
3923 stack_usage_map[i] = 1;
3929 #ifdef PREFERRED_STACK_BOUNDARY
3930 /* If we pushed args in forward order, perform stack alignment
3931 after pushing the last arg. */
3932 if (argblock == 0 && !PUSH_ARGS_REVERSED)
3933 anti_adjust_stack (GEN_INT (args_size.constant
3934 - original_args_size.constant));
3937 if (PUSH_ARGS_REVERSED)
3942 fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0);
3944 /* Now load any reg parms into their regs. */
3946 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3947 are to be pushed. */
3948 for (count = 0; count < nargs; count++, argnum += inc)
3950 register rtx val = argvec[argnum].value;
3951 rtx reg = argvec[argnum].reg;
3952 int partial = argvec[argnum].partial;
3954 /* Handle calls that pass values in multiple non-contiguous
3955 locations. The PA64 has examples of this for library calls. */
3956 if (reg != 0 && GET_CODE (reg) == PARALLEL)
3957 emit_group_load (reg, val,
3958 GET_MODE_SIZE (GET_MODE (val)),
3959 GET_MODE_ALIGNMENT (GET_MODE (val)));
3960 else if (reg != 0 && partial == 0)
3961 emit_move_insn (reg, val);
3966 /* Any regs containing parms remain in use through the call. */
3967 for (count = 0; count < nargs; count++)
3969 rtx reg = argvec[count].reg;
3970 if (reg != 0 && GET_CODE (reg) == PARALLEL)
3971 use_group_regs (&call_fusage, reg);
3973 use_reg (&call_fusage, reg);
3976 /* Pass the function the address in which to return a structure value. */
3977 if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value)
3979 emit_move_insn (struct_value_rtx,
3981 force_operand (XEXP (mem_value, 0),
3983 if (GET_CODE (struct_value_rtx) == REG)
3984 use_reg (&call_fusage, struct_value_rtx);
3987 /* Don't allow popping to be deferred, since then
3988 cse'ing of library calls could delete a call and leave the pop. */
3990 valreg = (mem_value == 0 && outmode != VOIDmode
3991 ? hard_libcall_value (outmode) : NULL_RTX);
3993 #ifdef PREFERRED_STACK_BOUNDARY
3994 /* Stack must be properly aligned now. */
3995 if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))
3999 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
4000 will set inhibit_defer_pop to that value. */
4001 /* The return type is needed to decide how many bytes the function pops.
4002 Signedness plays no role in that, so for simplicity, we pretend it's
4003 always signed. We also assume that the list of arguments passed has
4004 no impact, so we pretend it is unknown. */
4007 get_identifier (XSTR (orgfun, 0)),
4008 build_function_type (outmode == VOIDmode ? void_type_node
4009 : type_for_mode (outmode, 0), NULL_TREE),
4010 original_args_size.constant, args_size.constant,
4012 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
4014 old_inhibit_defer_pop + 1, call_fusage, flags);
4016 /* Now restore inhibit_defer_pop to its actual original value. */
4019 /* If call is cse'able, make appropriate pair of reg-notes around it.
4020 Test valreg so we don't crash; may safely ignore `const'
4021 if return type is void. Disable for PARALLEL return values, because
4022 we have no way to move such values into a pseudo register. */
4023 if ((flags & (ECF_CONST | ECF_PURE))
4024 && valreg != 0 && GET_CODE (valreg) != PARALLEL)
4027 rtx temp = gen_reg_rtx (GET_MODE (valreg));
4031 /* Construct an "equal form" for the value which mentions all the
4032 arguments in order as well as the function name. */
4033 for (i = 0; i < nargs; i++)
4034 note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note);
4035 note = gen_rtx_EXPR_LIST (VOIDmode, fun, note);
4037 insns = get_insns ();
4040 if (flags & ECF_PURE)
4041 note = gen_rtx_EXPR_LIST (VOIDmode,
4042 gen_rtx_USE (VOIDmode,
4043 gen_rtx_MEM (BLKmode,
4044 gen_rtx_SCRATCH (VOIDmode))), note);
4046 emit_libcall_block (insns, temp, valreg, note);
4050 else if (flags & (ECF_CONST | ECF_PURE))
4052 /* Otherwise, just write out the sequence without a note. */
4053 rtx insns = get_insns ();
4060 /* Copy the value to the right place. */
4061 if (outmode != VOIDmode && retval)
4067 if (value != mem_value)
4068 emit_move_insn (value, mem_value);
4070 else if (value != 0)
4071 emit_move_insn (value, hard_libcall_value (outmode));
4073 value = hard_libcall_value (outmode);
4076 if (ACCUMULATE_OUTGOING_ARGS)
4078 #ifdef REG_PARM_STACK_SPACE
4081 enum machine_mode save_mode = GET_MODE (save_area);
4082 #ifdef ARGS_GROW_DOWNWARD
4084 = gen_rtx_MEM (save_mode,
4085 memory_address (save_mode,
4086 plus_constant (argblock,
4090 = gen_rtx_MEM (save_mode,
4091 memory_address (save_mode,
4092 plus_constant (argblock, low_to_save)));
4094 if (save_mode != BLKmode)
4095 emit_move_insn (stack_area, save_area);
4097 emit_block_move (stack_area, validize_mem (save_area),
4098 GEN_INT (high_to_save - low_to_save + 1),
4103 /* If we saved any argument areas, restore them. */
4104 for (count = 0; count < nargs; count++)
4105 if (argvec[count].save_area)
4107 enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
4109 = gen_rtx_MEM (save_mode,
4112 plus_constant (argblock,
4113 argvec[count].offset.constant)));
4115 emit_move_insn (stack_area, argvec[count].save_area);
4118 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
4119 stack_usage_map = initial_stack_usage_map;
4126 /* Output a library call to function FUN (a SYMBOL_REF rtx)
4127 (emitting the queue unless NO_QUEUE is nonzero),
4128 for a value of mode OUTMODE,
4129 with NARGS different arguments, passed as alternating rtx values
4130 and machine_modes to convert them to.
4131 The rtx values should have been passed through protect_from_queue already.
4133 FN_TYPE will is zero for `normal' calls, one for `const' calls, wich
4134 which will be enclosed in REG_LIBCALL/REG_RETVAL notes and two for `pure'
4135 calls, that are handled like `const' calls with extra
4136 (use (memory (scratch)). */
4139 emit_library_call VPARAMS((rtx orgfun, int fn_type, enum machine_mode outmode,
4142 #ifndef ANSI_PROTOTYPES
4145 enum machine_mode outmode;
4150 VA_START (p, nargs);
4152 #ifndef ANSI_PROTOTYPES
4153 orgfun = va_arg (p, rtx);
4154 fn_type = va_arg (p, int);
4155 outmode = va_arg (p, enum machine_mode);
4156 nargs = va_arg (p, int);
4159 emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p);
4164 /* Like emit_library_call except that an extra argument, VALUE,
4165 comes second and says where to store the result.
4166 (If VALUE is zero, this function chooses a convenient way
4167 to return the value.
4169 This function returns an rtx for where the value is to be found.
4170 If VALUE is nonzero, VALUE is returned. */
4173 emit_library_call_value VPARAMS((rtx orgfun, rtx value, int fn_type,
4174 enum machine_mode outmode, int nargs, ...))
4176 #ifndef ANSI_PROTOTYPES
4180 enum machine_mode outmode;
4185 VA_START (p, nargs);
4187 #ifndef ANSI_PROTOTYPES
4188 orgfun = va_arg (p, rtx);
4189 value = va_arg (p, rtx);
4190 fn_type = va_arg (p, int);
4191 outmode = va_arg (p, enum machine_mode);
4192 nargs = va_arg (p, int);
4195 value = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, nargs, p);
4203 /* Return an rtx which represents a suitable home on the stack
4204 given TYPE, the type of the argument looking for a home.
4205 This is called only for BLKmode arguments.
4207 SIZE is the size needed for this target.
4208 ARGS_ADDR is the address of the bottom of the argument block for this call.
4209 OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless
4210 if this machine uses push insns. */
4213 target_for_arg (type, size, args_addr, offset)
4217 struct args_size offset;
4220 rtx offset_rtx = ARGS_SIZE_RTX (offset);
4222 /* We do not call memory_address if possible,
4223 because we want to address as close to the stack
4224 as possible. For non-variable sized arguments,
4225 this will be stack-pointer relative addressing. */
4226 if (GET_CODE (offset_rtx) == CONST_INT)
4227 target = plus_constant (args_addr, INTVAL (offset_rtx));
4230 /* I have no idea how to guarantee that this
4231 will work in the presence of register parameters. */
4232 target = gen_rtx_PLUS (Pmode, args_addr, offset_rtx);
4233 target = memory_address (QImode, target);
4236 return gen_rtx_MEM (BLKmode, target);
4240 /* Store a single argument for a function call
4241 into the register or memory area where it must be passed.
4242 *ARG describes the argument value and where to pass it.
4244 ARGBLOCK is the address of the stack-block for all the arguments,
4245 or 0 on a machine where arguments are pushed individually.
4247 MAY_BE_ALLOCA nonzero says this could be a call to `alloca'
4248 so must be careful about how the stack is used.
4250 VARIABLE_SIZE nonzero says that this was a variable-sized outgoing
4251 argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate
4252 that we need not worry about saving and restoring the stack.
4254 FNDECL is the declaration of the function we are calling.
4256 Return non-zero if this arg should cause sibcall failure,
4260 store_one_arg (arg, argblock, flags, variable_size,
4261 reg_parm_stack_space)
4262 struct arg_data *arg;
4265 int variable_size ATTRIBUTE_UNUSED;
4266 int reg_parm_stack_space;
4268 register tree pval = arg->tree_value;
4272 int i, lower_bound = 0, upper_bound = 0;
4273 int sibcall_failure = 0;
4275 if (TREE_CODE (pval) == ERROR_MARK)
4278 /* Push a new temporary level for any temporaries we make for
4282 if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL))
4284 /* If this is being stored into a pre-allocated, fixed-size, stack area,
4285 save any previous data at that location. */
4286 if (argblock && ! variable_size && arg->stack)
4288 #ifdef ARGS_GROW_DOWNWARD
4289 /* stack_slot is negative, but we want to index stack_usage_map
4290 with positive values. */
4291 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
4292 upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1;
4296 lower_bound = upper_bound - arg->size.constant;
4298 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
4299 lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1));
4303 upper_bound = lower_bound + arg->size.constant;
4306 for (i = lower_bound; i < upper_bound; i++)
4307 if (stack_usage_map[i]
4308 /* Don't store things in the fixed argument area at this point;
4309 it has already been saved. */
4310 && i > reg_parm_stack_space)
4313 if (i != upper_bound)
4315 /* We need to make a save area. See what mode we can make it. */
4316 enum machine_mode save_mode
4317 = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1);
4319 = gen_rtx_MEM (save_mode,
4320 memory_address (save_mode,
4321 XEXP (arg->stack_slot, 0)));
4323 if (save_mode == BLKmode)
4325 arg->save_area = assign_stack_temp (BLKmode,
4326 arg->size.constant, 0);
4327 MEM_SET_IN_STRUCT_P (arg->save_area,
4328 AGGREGATE_TYPE_P (TREE_TYPE
4329 (arg->tree_value)));
4330 preserve_temp_slots (arg->save_area);
4331 emit_block_move (validize_mem (arg->save_area), stack_area,
4332 GEN_INT (arg->size.constant),
4337 arg->save_area = gen_reg_rtx (save_mode);
4338 emit_move_insn (arg->save_area, stack_area);
4342 /* Now that we have saved any slots that will be overwritten by this
4343 store, mark all slots this store will use. We must do this before
4344 we actually expand the argument since the expansion itself may
4345 trigger library calls which might need to use the same stack slot. */
4346 if (argblock && ! variable_size && arg->stack)
4347 for (i = lower_bound; i < upper_bound; i++)
4348 stack_usage_map[i] = 1;
4351 /* If this isn't going to be placed on both the stack and in registers,
4352 set up the register and number of words. */
4353 if (! arg->pass_on_stack)
4354 reg = arg->reg, partial = arg->partial;
4356 if (reg != 0 && partial == 0)
4357 /* Being passed entirely in a register. We shouldn't be called in
4361 /* If this arg needs special alignment, don't load the registers
4363 if (arg->n_aligned_regs != 0)
4366 /* If this is being passed partially in a register, we can't evaluate
4367 it directly into its stack slot. Otherwise, we can. */
4368 if (arg->value == 0)
4370 /* stack_arg_under_construction is nonzero if a function argument is
4371 being evaluated directly into the outgoing argument list and
4372 expand_call must take special action to preserve the argument list
4373 if it is called recursively.
4375 For scalar function arguments stack_usage_map is sufficient to
4376 determine which stack slots must be saved and restored. Scalar
4377 arguments in general have pass_on_stack == 0.
4379 If this argument is initialized by a function which takes the
4380 address of the argument (a C++ constructor or a C function
4381 returning a BLKmode structure), then stack_usage_map is
4382 insufficient and expand_call must push the stack around the
4383 function call. Such arguments have pass_on_stack == 1.
4385 Note that it is always safe to set stack_arg_under_construction,
4386 but this generates suboptimal code if set when not needed. */
4388 if (arg->pass_on_stack)
4389 stack_arg_under_construction++;
4391 arg->value = expand_expr (pval,
4393 || TYPE_MODE (TREE_TYPE (pval)) != arg->mode)
4394 ? NULL_RTX : arg->stack,
4397 /* If we are promoting object (or for any other reason) the mode
4398 doesn't agree, convert the mode. */
4400 if (arg->mode != TYPE_MODE (TREE_TYPE (pval)))
4401 arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)),
4402 arg->value, arg->unsignedp);
4404 if (arg->pass_on_stack)
4405 stack_arg_under_construction--;
4408 /* Don't allow anything left on stack from computation
4409 of argument to alloca. */
4410 if (flags & ECF_MAY_BE_ALLOCA)
4411 do_pending_stack_adjust ();
4413 if (arg->value == arg->stack)
4415 /* If the value is already in the stack slot, we are done. */
4416 if (current_function_check_memory_usage && GET_CODE (arg->stack) == MEM)
4418 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
4419 XEXP (arg->stack, 0), Pmode,
4420 ARGS_SIZE_RTX (arg->size),
4421 TYPE_MODE (sizetype),
4422 GEN_INT (MEMORY_USE_RW),
4423 TYPE_MODE (integer_type_node));
4426 else if (arg->mode != BLKmode)
4430 /* Argument is a scalar, not entirely passed in registers.
4431 (If part is passed in registers, arg->partial says how much
4432 and emit_push_insn will take care of putting it there.)
4434 Push it, and if its size is less than the
4435 amount of space allocated to it,
4436 also bump stack pointer by the additional space.
4437 Note that in C the default argument promotions
4438 will prevent such mismatches. */
4440 size = GET_MODE_SIZE (arg->mode);
4441 /* Compute how much space the push instruction will push.
4442 On many machines, pushing a byte will advance the stack
4443 pointer by a halfword. */
4444 #ifdef PUSH_ROUNDING
4445 size = PUSH_ROUNDING (size);
4449 /* Compute how much space the argument should get:
4450 round up to a multiple of the alignment for arguments. */
4451 if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)))
4452 used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1)
4453 / (PARM_BOUNDARY / BITS_PER_UNIT))
4454 * (PARM_BOUNDARY / BITS_PER_UNIT));
4456 /* This isn't already where we want it on the stack, so put it there.
4457 This can either be done with push or copy insns. */
4458 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, 0,
4459 partial, reg, used - size, argblock,
4460 ARGS_SIZE_RTX (arg->offset), reg_parm_stack_space,
4461 ARGS_SIZE_RTX (arg->alignment_pad));
4465 /* BLKmode, at least partly to be pushed. */
4467 register int excess;
4470 /* Pushing a nonscalar.
4471 If part is passed in registers, PARTIAL says how much
4472 and emit_push_insn will take care of putting it there. */
4474 /* Round its size up to a multiple
4475 of the allocation unit for arguments. */
4477 if (arg->size.var != 0)
4480 size_rtx = ARGS_SIZE_RTX (arg->size);
4484 /* PUSH_ROUNDING has no effect on us, because
4485 emit_push_insn for BLKmode is careful to avoid it. */
4486 excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval))
4487 + partial * UNITS_PER_WORD);
4488 size_rtx = expr_size (pval);
4491 if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM)
4493 /* emit_push_insn might not work properly if arg->value and
4494 argblock + arg->offset areas overlap. */
4498 if (XEXP (x, 0) == current_function_internal_arg_pointer
4499 || (GET_CODE (XEXP (x, 0)) == PLUS
4500 && XEXP (XEXP (x, 0), 0) ==
4501 current_function_internal_arg_pointer
4502 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT))
4504 if (XEXP (x, 0) != current_function_internal_arg_pointer)
4505 i = INTVAL (XEXP (XEXP (x, 0), 1));
4507 /* expand_call should ensure this */
4508 if (arg->offset.var || GET_CODE (size_rtx) != CONST_INT)
4511 if (arg->offset.constant > i)
4513 if (arg->offset.constant < i + INTVAL (size_rtx))
4514 sibcall_failure = 1;
4516 else if (arg->offset.constant < i)
4518 if (i < arg->offset.constant + INTVAL (size_rtx))
4519 sibcall_failure = 1;
4524 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx,
4525 TYPE_ALIGN (TREE_TYPE (pval)), partial, reg, excess,
4526 argblock, ARGS_SIZE_RTX (arg->offset),
4527 reg_parm_stack_space,
4528 ARGS_SIZE_RTX (arg->alignment_pad));
4532 /* Unless this is a partially-in-register argument, the argument is now
4535 ??? Note that this can change arg->value from arg->stack to
4536 arg->stack_slot and it matters when they are not the same.
4537 It isn't totally clear that this is correct in all cases. */
4539 arg->value = arg->stack_slot;
4541 /* Once we have pushed something, pops can't safely
4542 be deferred during the rest of the arguments. */
4545 /* ANSI doesn't require a sequence point here,
4546 but PCC has one, so this will avoid some problems. */
4549 /* Free any temporary slots made in processing this argument. Show
4550 that we might have taken the address of something and pushed that
4552 preserve_temp_slots (NULL_RTX);
4556 return sibcall_failure;