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Diffstat (limited to 'gcc/calls.c')
| -rw-r--r-- | gcc/calls.c | 3199 |
1 files changed, 0 insertions, 3199 deletions
diff --git a/gcc/calls.c b/gcc/calls.c deleted file mode 100644 index 9a6b7fb75f9..00000000000 --- a/gcc/calls.c +++ /dev/null @@ -1,3199 +0,0 @@ -/* Convert function calls to rtl insns, for GNU C compiler. - Copyright (C) 1989, 92, 93, 94, 95, 1996 Free Software Foundation, Inc. - -This file is part of GNU CC. - -GNU CC is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU CC is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ - -#include "config.h" -#include "rtl.h" -#include "tree.h" -#include "flags.h" -#include "expr.h" -#ifdef __STDC__ -#include <stdarg.h> -#else -#include <varargs.h> -#endif -#include "insn-flags.h" - -/* Decide whether a function's arguments should be processed - from first to last or from last to first. - - They should if the stack and args grow in opposite directions, but - only if we have push insns. */ - -#ifdef PUSH_ROUNDING - -#if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) -#define PUSH_ARGS_REVERSED /* If it's last to first */ -#endif - -#endif - -/* Like STACK_BOUNDARY but in units of bytes, not bits. */ -#define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) - -/* Data structure and subroutines used within expand_call. */ - -struct arg_data -{ - /* Tree node for this argument. */ - tree tree_value; - /* Mode for value; TYPE_MODE unless promoted. */ - enum machine_mode mode; - /* Current RTL value for argument, or 0 if it isn't precomputed. */ - rtx value; - /* Initially-compute RTL value for argument; only for const functions. */ - rtx initial_value; - /* Register to pass this argument in, 0 if passed on stack, or an - EXPR_LIST if the arg is to be copied into multiple different - registers. */ - rtx reg; - /* If REG was promoted from the actual mode of the argument expression, - indicates whether the promotion is sign- or zero-extended. */ - int unsignedp; - /* Number of registers to use. 0 means put the whole arg in registers. - Also 0 if not passed in registers. */ - int partial; - /* Non-zero if argument must be passed on stack. - Note that some arguments may be passed on the stack - even though pass_on_stack is zero, just because FUNCTION_ARG says so. - pass_on_stack identifies arguments that *cannot* go in registers. */ - int pass_on_stack; - /* Offset of this argument from beginning of stack-args. */ - struct args_size offset; - /* Similar, but offset to the start of the stack slot. Different from - OFFSET if this arg pads downward. */ - struct args_size slot_offset; - /* Size of this argument on the stack, rounded up for any padding it gets, - parts of the argument passed in registers do not count. - If REG_PARM_STACK_SPACE is defined, then register parms - are counted here as well. */ - struct args_size size; - /* Location on the stack at which parameter should be stored. The store - has already been done if STACK == VALUE. */ - rtx stack; - /* Location on the stack of the start of this argument slot. This can - differ from STACK if this arg pads downward. This location is known - to be aligned to FUNCTION_ARG_BOUNDARY. */ - rtx stack_slot; -#ifdef ACCUMULATE_OUTGOING_ARGS - /* Place that this stack area has been saved, if needed. */ - rtx save_area; -#endif - /* If an argument's alignment does not permit direct copying into registers, - copy in smaller-sized pieces into pseudos. These are stored in a - block pointed to by this field. The next field says how many - word-sized pseudos we made. */ - rtx *aligned_regs; - int n_aligned_regs; -}; - -#ifdef ACCUMULATE_OUTGOING_ARGS -/* A vector of one char per byte of stack space. A byte if non-zero if - the corresponding stack location has been used. - This vector is used to prevent a function call within an argument from - clobbering any stack already set up. */ -static char *stack_usage_map; - -/* Size of STACK_USAGE_MAP. */ -static int highest_outgoing_arg_in_use; - -/* stack_arg_under_construction is nonzero when an argument may be - initialized with a constructor call (including a C function that - returns a BLKmode struct) and expand_call must take special action - to make sure the object being constructed does not overlap the - argument list for the constructor call. */ -int stack_arg_under_construction; -#endif - -static int calls_function PROTO((tree, int)); -static int calls_function_1 PROTO((tree, int)); -static void emit_call_1 PROTO((rtx, tree, tree, int, int, rtx, rtx, - int, rtx, int)); -static void store_one_arg PROTO ((struct arg_data *, rtx, int, int, - tree, int)); - -/* If WHICH is 1, return 1 if EXP contains a call to the built-in function - `alloca'. - - If WHICH is 0, return 1 if EXP contains a call to any function. - Actually, we only need return 1 if evaluating EXP would require pushing - arguments on the stack, but that is too difficult to compute, so we just - assume any function call might require the stack. */ - -static tree calls_function_save_exprs; - -static int -calls_function (exp, which) - tree exp; - int which; -{ - int val; - calls_function_save_exprs = 0; - val = calls_function_1 (exp, which); - calls_function_save_exprs = 0; - return val; -} - -static int -calls_function_1 (exp, which) - tree exp; - int which; -{ - register int i; - enum tree_code code = TREE_CODE (exp); - int type = TREE_CODE_CLASS (code); - int length = tree_code_length[(int) code]; - - /* If this code is language-specific, we don't know what it will do. */ - if ((int) code >= NUM_TREE_CODES) - return 1; - - /* Only expressions and references can contain calls. */ - if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r' - && type != 'b') - return 0; - - switch (code) - { - case CALL_EXPR: - if (which == 0) - return 1; - else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR - && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) - == FUNCTION_DECL)) - { - tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); - - if ((DECL_BUILT_IN (fndecl) - && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_ALLOCA) - || (DECL_SAVED_INSNS (fndecl) - && (FUNCTION_FLAGS (DECL_SAVED_INSNS (fndecl)) - & FUNCTION_FLAGS_CALLS_ALLOCA))) - return 1; - } - - /* Third operand is RTL. */ - length = 2; - break; - - case SAVE_EXPR: - if (SAVE_EXPR_RTL (exp) != 0) - return 0; - if (value_member (exp, calls_function_save_exprs)) - return 0; - calls_function_save_exprs = tree_cons (NULL_TREE, exp, - calls_function_save_exprs); - return (TREE_OPERAND (exp, 0) != 0 - && calls_function_1 (TREE_OPERAND (exp, 0), which)); - - case BLOCK: - { - register tree local; - - for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) - if (DECL_INITIAL (local) != 0 - && calls_function_1 (DECL_INITIAL (local), which)) - return 1; - } - { - register tree subblock; - - for (subblock = BLOCK_SUBBLOCKS (exp); - subblock; - subblock = TREE_CHAIN (subblock)) - if (calls_function_1 (subblock, which)) - return 1; - } - return 0; - - case METHOD_CALL_EXPR: - length = 3; - break; - - case WITH_CLEANUP_EXPR: - length = 1; - break; - - case RTL_EXPR: - return 0; - } - - for (i = 0; i < length; i++) - if (TREE_OPERAND (exp, i) != 0 - && calls_function_1 (TREE_OPERAND (exp, i), which)) - return 1; - - return 0; -} - -/* Force FUNEXP into a form suitable for the address of a CALL, - and return that as an rtx. Also load the static chain register - if FNDECL is a nested function. - - CALL_FUSAGE points to a variable holding the prospective - CALL_INSN_FUNCTION_USAGE information. */ - -rtx -prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen) - rtx funexp; - tree fndecl; - rtx *call_fusage; - int reg_parm_seen; -{ - rtx static_chain_value = 0; - - funexp = protect_from_queue (funexp, 0); - - if (fndecl != 0) - /* Get possible static chain value for nested function in C. */ - static_chain_value = lookup_static_chain (fndecl); - - /* Make a valid memory address and copy constants thru pseudo-regs, - but not for a constant address if -fno-function-cse. */ - if (GET_CODE (funexp) != SYMBOL_REF) - funexp = -#ifdef SMALL_REGISTER_CLASSES - /* If we are using registers for parameters, force the - function address into a register now. */ - reg_parm_seen ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) - : -#endif - memory_address (FUNCTION_MODE, funexp); - else - { -#ifndef NO_FUNCTION_CSE - if (optimize && ! flag_no_function_cse) -#ifdef NO_RECURSIVE_FUNCTION_CSE - if (fndecl != current_function_decl) -#endif - funexp = force_reg (Pmode, funexp); -#endif - } - - if (static_chain_value != 0) - { - emit_move_insn (static_chain_rtx, static_chain_value); - - if (GET_CODE (static_chain_rtx) == REG) - use_reg (call_fusage, static_chain_rtx); - } - - return funexp; -} - -/* Generate instructions to call function FUNEXP, - and optionally pop the results. - The CALL_INSN is the first insn generated. - - FNDECL is the declaration node of the function. This is given ot the - macro RETURN_POPS_ARGS to determine whether this function pops its own args. - - FUNTYPE is the data type of the function, or, for a library call, - the identifier for the name of the call. This is given to the - macro RETURN_POPS_ARGS to determine whether this function pops its own args. - - STACK_SIZE is the number of bytes of arguments on the stack, - rounded up to STACK_BOUNDARY; zero if the size is variable. - This is both to put into the call insn and - to generate explicit popping code if necessary. - - STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. - It is zero if this call doesn't want a structure value. - - NEXT_ARG_REG is the rtx that results from executing - FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) - just after all the args have had their registers assigned. - This could be whatever you like, but normally it is the first - arg-register beyond those used for args in this call, - or 0 if all the arg-registers are used in this call. - It is passed on to `gen_call' so you can put this info in the call insn. - - VALREG is a hard register in which a value is returned, - or 0 if the call does not return a value. - - OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before - the args to this call were processed. - We restore `inhibit_defer_pop' to that value. - - CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that - denote registers used by the called function. - - IS_CONST is true if this is a `const' call. */ - -static void -emit_call_1 (funexp, fndecl, funtype, stack_size, struct_value_size, - next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, - is_const) - rtx funexp; - tree fndecl; - tree funtype; - int stack_size; - int struct_value_size; - rtx next_arg_reg; - rtx valreg; - int old_inhibit_defer_pop; - rtx call_fusage; - int is_const; -{ - rtx stack_size_rtx = GEN_INT (stack_size); - rtx struct_value_size_rtx = GEN_INT (struct_value_size); - rtx call_insn; - int already_popped = 0; - - /* Ensure address is valid. SYMBOL_REF is already valid, so no need, - and we don't want to load it into a register as an optimization, - because prepare_call_address already did it if it should be done. */ - if (GET_CODE (funexp) != SYMBOL_REF) - funexp = memory_address (FUNCTION_MODE, funexp); - -#ifndef ACCUMULATE_OUTGOING_ARGS -#if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) - if (HAVE_call_pop && HAVE_call_value_pop - && (RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0 - || stack_size == 0)) - { - rtx n_pop = GEN_INT (RETURN_POPS_ARGS (fndecl, funtype, stack_size)); - rtx pat; - - /* If this subroutine pops its own args, record that in the call insn - if possible, for the sake of frame pointer elimination. */ - - if (valreg) - pat = gen_call_value_pop (valreg, - gen_rtx (MEM, FUNCTION_MODE, funexp), - stack_size_rtx, next_arg_reg, n_pop); - else - pat = gen_call_pop (gen_rtx (MEM, FUNCTION_MODE, funexp), - stack_size_rtx, next_arg_reg, n_pop); - - emit_call_insn (pat); - already_popped = 1; - } - else -#endif -#endif - -#if defined (HAVE_call) && defined (HAVE_call_value) - if (HAVE_call && HAVE_call_value) - { - if (valreg) - emit_call_insn (gen_call_value (valreg, - gen_rtx (MEM, FUNCTION_MODE, funexp), - stack_size_rtx, next_arg_reg, - NULL_RTX)); - else - emit_call_insn (gen_call (gen_rtx (MEM, FUNCTION_MODE, funexp), - stack_size_rtx, next_arg_reg, - struct_value_size_rtx)); - } - else -#endif - abort (); - - /* Find the CALL insn we just emitted. */ - for (call_insn = get_last_insn (); - call_insn && GET_CODE (call_insn) != CALL_INSN; - call_insn = PREV_INSN (call_insn)) - ; - - if (! call_insn) - abort (); - - /* Put the register usage information on the CALL. If there is already - some usage information, put ours at the end. */ - if (CALL_INSN_FUNCTION_USAGE (call_insn)) - { - rtx link; - - for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0; - link = XEXP (link, 1)) - ; - - XEXP (link, 1) = call_fusage; - } - else - CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage; - - /* If this is a const call, then set the insn's unchanging bit. */ - if (is_const) - CONST_CALL_P (call_insn) = 1; - - /* Restore this now, so that we do defer pops for this call's args - if the context of the call as a whole permits. */ - inhibit_defer_pop = old_inhibit_defer_pop; - -#ifndef ACCUMULATE_OUTGOING_ARGS - /* If returning from the subroutine does not automatically pop the args, - we need an instruction to pop them sooner or later. - Perhaps do it now; perhaps just record how much space to pop later. - - If returning from the subroutine does pop the args, indicate that the - stack pointer will be changed. */ - - if (stack_size != 0 && RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0) - { - if (!already_popped) - CALL_INSN_FUNCTION_USAGE (call_insn) = - gen_rtx (EXPR_LIST, VOIDmode, - gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx), - CALL_INSN_FUNCTION_USAGE (call_insn)); - stack_size -= RETURN_POPS_ARGS (fndecl, funtype, stack_size); - stack_size_rtx = GEN_INT (stack_size); - } - - if (stack_size != 0) - { - if (flag_defer_pop && inhibit_defer_pop == 0 && !is_const) - pending_stack_adjust += stack_size; - else - adjust_stack (stack_size_rtx); - } -#endif -} - -/* Generate all the code for a function call - and return an rtx for its value. - Store the value in TARGET (specified as an rtx) if convenient. - If the value is stored in TARGET then TARGET is returned. - If IGNORE is nonzero, then we ignore the value of the function call. */ - -rtx -expand_call (exp, target, ignore) - tree exp; - rtx target; - int ignore; -{ - /* List of actual parameters. */ - tree actparms = TREE_OPERAND (exp, 1); - /* RTX for the function to be called. */ - rtx funexp; - /* Tree node for the function to be called (not the address!). */ - tree funtree; - /* Data type of the function. */ - tree funtype; - /* Declaration of the function being called, - or 0 if the function is computed (not known by name). */ - tree fndecl = 0; - char *name = 0; - - /* Register in which non-BLKmode value will be returned, - or 0 if no value or if value is BLKmode. */ - rtx valreg; - /* Address where we should return a BLKmode value; - 0 if value not BLKmode. */ - rtx structure_value_addr = 0; - /* Nonzero if that address is being passed by treating it as - an extra, implicit first parameter. Otherwise, - it is passed by being copied directly into struct_value_rtx. */ - int structure_value_addr_parm = 0; - /* Size of aggregate value wanted, or zero if none wanted - or if we are using the non-reentrant PCC calling convention - or expecting the value in registers. */ - int struct_value_size = 0; - /* Nonzero if called function returns an aggregate in memory PCC style, - by returning the address of where to find it. */ - int pcc_struct_value = 0; - - /* Number of actual parameters in this call, including struct value addr. */ - int num_actuals; - /* Number of named args. Args after this are anonymous ones - and they must all go on the stack. */ - int n_named_args; - /* Count arg position in order args appear. */ - int argpos; - - /* Vector of information about each argument. - Arguments are numbered in the order they will be pushed, - not the order they are written. */ - struct arg_data *args; - - /* Total size in bytes of all the stack-parms scanned so far. */ - struct args_size args_size; - /* Size of arguments before any adjustments (such as rounding). */ - struct args_size original_args_size; - /* Data on reg parms scanned so far. */ - CUMULATIVE_ARGS args_so_far; - /* Nonzero if a reg parm has been scanned. */ - int reg_parm_seen; - /* Nonzero if this is an indirect function call. */ - int current_call_is_indirect = 0; - - /* Nonzero if we must avoid push-insns in the args for this call. - If stack space is allocated for register parameters, but not by the - caller, then it is preallocated in the fixed part of the stack frame. - So the entire argument block must then be preallocated (i.e., we - ignore PUSH_ROUNDING in that case). */ - -#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) - int must_preallocate = 1; -#else -#ifdef PUSH_ROUNDING - int must_preallocate = 0; -#else - int must_preallocate = 1; -#endif -#endif - - /* Size of the stack reserved for parameter registers. */ - int reg_parm_stack_space = 0; - - /* 1 if scanning parms front to back, -1 if scanning back to front. */ - int inc; - /* Address of space preallocated for stack parms - (on machines that lack push insns), or 0 if space not preallocated. */ - rtx argblock = 0; - - /* Nonzero if it is plausible that this is a call to alloca. */ - int may_be_alloca; - /* Nonzero if this is a call to setjmp or a related function. */ - int returns_twice; - /* Nonzero if this is a call to `longjmp'. */ - int is_longjmp; - /* Nonzero if this is a call to an inline function. */ - int is_integrable = 0; - /* Nonzero if this is a call to a `const' function. - Note that only explicitly named functions are handled as `const' here. */ - int is_const = 0; - /* Nonzero if this is a call to a `volatile' function. */ - int is_volatile = 0; -#if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) - /* Define the boundary of the register parm stack space that needs to be - save, if any. */ - int low_to_save = -1, high_to_save; - rtx save_area = 0; /* Place that it is saved */ -#endif - -#ifdef ACCUMULATE_OUTGOING_ARGS - int initial_highest_arg_in_use = highest_outgoing_arg_in_use; - char *initial_stack_usage_map = stack_usage_map; -#endif - - rtx old_stack_level = 0; - int old_pending_adj = 0; - int old_stack_arg_under_construction; - int old_inhibit_defer_pop = inhibit_defer_pop; - tree old_cleanups = cleanups_this_call; - rtx call_fusage = 0; - register tree p; - register int i, j; - - /* See if we can find a DECL-node for the actual function. - As a result, decide whether this is a call to an integrable function. */ - - p = TREE_OPERAND (exp, 0); - if (TREE_CODE (p) == ADDR_EXPR) - { - fndecl = TREE_OPERAND (p, 0); - if (TREE_CODE (fndecl) != FUNCTION_DECL) - fndecl = 0; - else - { - if (!flag_no_inline - && fndecl != current_function_decl - && DECL_INLINE (fndecl) - && DECL_SAVED_INSNS (fndecl) - && RTX_INTEGRATED_P (DECL_SAVED_INSNS (fndecl))) - is_integrable = 1; - else if (! TREE_ADDRESSABLE (fndecl)) - { - /* In case this function later becomes inlinable, - record that there was already a non-inline call to it. - - Use abstraction instead of setting TREE_ADDRESSABLE - directly. */ - if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline - && optimize > 0) - { - warning_with_decl (fndecl, "can't inline call to `%s'"); - warning ("called from here"); - } - mark_addressable (fndecl); - } - - if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl) - && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode) - is_const = 1; - - if (TREE_THIS_VOLATILE (fndecl)) - is_volatile = 1; - } - } - - /* If we don't have specific function to call, see if we have a - constant or `noreturn' function from the type. */ - if (fndecl == 0) - { - is_const = TREE_READONLY (TREE_TYPE (TREE_TYPE (p))); - is_volatile = TREE_THIS_VOLATILE (TREE_TYPE (TREE_TYPE (p))); - } - -#ifdef REG_PARM_STACK_SPACE -#ifdef MAYBE_REG_PARM_STACK_SPACE - reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; -#else - reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); -#endif -#endif - - /* Warn if this value is an aggregate type, - regardless of which calling convention we are using for it. */ - if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) - warning ("function call has aggregate value"); - - /* Set up a place to return a structure. */ - - /* Cater to broken compilers. */ - if (aggregate_value_p (exp)) - { - /* This call returns a big structure. */ - is_const = 0; - -#ifdef PCC_STATIC_STRUCT_RETURN - { - pcc_struct_value = 1; - /* Easier than making that case work right. */ - if (is_integrable) - { - /* In case this is a static function, note that it has been - used. */ - if (! TREE_ADDRESSABLE (fndecl)) - mark_addressable (fndecl); - is_integrable = 0; - } - } -#else /* not PCC_STATIC_STRUCT_RETURN */ - { - struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); - - if (target && GET_CODE (target) == MEM) - structure_value_addr = XEXP (target, 0); - else - { - /* Assign a temporary on the stack to hold the value. */ - - /* For variable-sized objects, we must be called with a target - specified. If we were to allocate space on the stack here, - we would have no way of knowing when to free it. */ - - if (struct_value_size < 0) - abort (); - - structure_value_addr - = XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0); - MEM_IN_STRUCT_P (structure_value_addr) - = AGGREGATE_TYPE_P (TREE_TYPE (exp)); - target = 0; - } - } -#endif /* not PCC_STATIC_STRUCT_RETURN */ - } - - /* If called function is inline, try to integrate it. */ - - if (is_integrable) - { - rtx temp; - rtx before_call = get_last_insn (); - - temp = expand_inline_function (fndecl, actparms, target, - ignore, TREE_TYPE (exp), - structure_value_addr); - - /* If inlining succeeded, return. */ - if ((HOST_WIDE_INT) temp != -1) - { - if (flag_short_temps) - { - /* Perform all cleanups needed for the arguments of this - call (i.e. destructors in C++). It is ok if these - destructors clobber RETURN_VALUE_REG, because the - only time we care about this is when TARGET is that - register. But in C++, we take care to never return - that register directly. */ - expand_cleanups_to (old_cleanups); - } - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* If the outgoing argument list must be preserved, push - the stack before executing the inlined function if it - makes any calls. */ - - for (i = reg_parm_stack_space - 1; i >= 0; i--) - if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) - break; - - if (stack_arg_under_construction || i >= 0) - { - rtx insn = NEXT_INSN (before_call), seq; - - /* Look for a call in the inline function code. - If OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) is - nonzero then there is a call and it is not necessary - to scan the insns. */ - - if (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) == 0) - for (; insn; insn = NEXT_INSN (insn)) - if (GET_CODE (insn) == CALL_INSN) - break; - - if (insn) - { - /* Reserve enough stack space so that the largest - argument list of any function call in the inline - function does not overlap the argument list being - evaluated. This is usually an overestimate because - allocate_dynamic_stack_space reserves space for an - outgoing argument list in addition to the requested - space, but there is no way to ask for stack space such - that an argument list of a certain length can be - safely constructed. */ - - int adjust = OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)); -#ifdef REG_PARM_STACK_SPACE - /* Add the stack space reserved for register arguments - in the inline function. What is really needed is the - largest value of reg_parm_stack_space in the inline - function, but that is not available. Using the current - value of reg_parm_stack_space is wrong, but gives - correct results on all supported machines. */ - adjust += reg_parm_stack_space; -#endif - start_sequence (); - emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); - allocate_dynamic_stack_space (GEN_INT (adjust), - NULL_RTX, BITS_PER_UNIT); - seq = get_insns (); - end_sequence (); - emit_insns_before (seq, NEXT_INSN (before_call)); - emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); - } - } -#endif - - /* If the result is equivalent to TARGET, return TARGET to simplify - checks in store_expr. They can be equivalent but not equal in the - case of a function that returns BLKmode. */ - if (temp != target && rtx_equal_p (temp, target)) - return target; - return temp; - } - - /* If inlining failed, mark FNDECL as needing to be compiled - separately after all. If function was declared inline, - give a warning. */ - if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline - && optimize > 0 && ! TREE_ADDRESSABLE (fndecl)) - { - warning_with_decl (fndecl, "inlining failed in call to `%s'"); - warning ("called from here"); - } - mark_addressable (fndecl); - } - - /* When calling a const function, we must pop the stack args right away, - so that the pop is deleted or moved with the call. */ - if (is_const) - NO_DEFER_POP; - - function_call_count++; - - if (fndecl && DECL_NAME (fndecl)) - name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); - - /* On some machines (such as the PA) indirect calls have a different - calling convention than normal calls. FUNCTION_ARG in the target - description can look at current_call_is_indirect to determine which - calling convention to use. */ - current_call_is_indirect = (fndecl == 0); -#if 0 - = TREE_CODE (TREE_OPERAND (exp, 0)) == NON_LVALUE_EXPR ? 1 : 0; -#endif - -#if 0 - /* Unless it's a call to a specific function that isn't alloca, - if it has one argument, we must assume it might be alloca. */ - - may_be_alloca = - (!(fndecl != 0 && strcmp (name, "alloca")) - && actparms != 0 - && TREE_CHAIN (actparms) == 0); -#else - /* We assume that alloca will always be called by name. It - makes no sense to pass it as a pointer-to-function to - anything that does not understand its behavior. */ - may_be_alloca = - (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 - && name[0] == 'a' - && ! strcmp (name, "alloca")) - || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 - && name[0] == '_' - && ! strcmp (name, "__builtin_alloca")))); -#endif - - /* See if this is a call to a function that can return more than once - or a call to longjmp. */ - - returns_twice = 0; - is_longjmp = 0; - - if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15) - { - char *tname = name; - - /* Disregard prefix _, __ or __x. */ - if (name[0] == '_') - { - if (name[1] == '_' && name[2] == 'x') - tname += 3; - else if (name[1] == '_') - tname += 2; - else - tname += 1; - } - - if (tname[0] == 's') - { - returns_twice - = ((tname[1] == 'e' - && (! strcmp (tname, "setjmp") - || ! strcmp (tname, "setjmp_syscall"))) - || (tname[1] == 'i' - && ! strcmp (tname, "sigsetjmp")) - || (tname[1] == 'a' - && ! strcmp (tname, "savectx"))); - if (tname[1] == 'i' - && ! strcmp (tname, "siglongjmp")) - is_longjmp = 1; - } - else if ((tname[0] == 'q' && tname[1] == 's' - && ! strcmp (tname, "qsetjmp")) - || (tname[0] == 'v' && tname[1] == 'f' - && ! strcmp (tname, "vfork"))) - returns_twice = 1; - - else if (tname[0] == 'l' && tname[1] == 'o' - && ! strcmp (tname, "longjmp")) - is_longjmp = 1; - } - - if (may_be_alloca) - current_function_calls_alloca = 1; - - /* Don't let pending stack adjusts add up to too much. - Also, do all pending adjustments now - if there is any chance this might be a call to alloca. */ - - if (pending_stack_adjust >= 32 - || (pending_stack_adjust > 0 && may_be_alloca)) - do_pending_stack_adjust (); - - /* Operand 0 is a pointer-to-function; get the type of the function. */ - funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); - if (TREE_CODE (funtype) != POINTER_TYPE) - abort (); - funtype = TREE_TYPE (funtype); - - /* Push the temporary stack slot level so that we can free any temporaries - we make. */ - push_temp_slots (); - - /* Start updating where the next arg would go. */ - INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX); - - /* If struct_value_rtx is 0, it means pass the address - as if it were an extra parameter. */ - if (structure_value_addr && struct_value_rtx == 0) - { - /* If structure_value_addr is a REG other than - virtual_outgoing_args_rtx, we can use always use it. If it - is not a REG, we must always copy it into a register. - If it is virtual_outgoing_args_rtx, we must copy it to another - register in some cases. */ - rtx temp = (GET_CODE (structure_value_addr) != REG -#ifdef ACCUMULATE_OUTGOING_ARGS - || (stack_arg_under_construction - && structure_value_addr == virtual_outgoing_args_rtx) -#endif - ? copy_addr_to_reg (structure_value_addr) - : structure_value_addr); - - actparms - = tree_cons (error_mark_node, - make_tree (build_pointer_type (TREE_TYPE (funtype)), - temp), - actparms); - structure_value_addr_parm = 1; - } - - /* Count the arguments and set NUM_ACTUALS. */ - for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++; - num_actuals = i; - - /* Compute number of named args. - Normally, don't include the last named arg if anonymous args follow. - We do include the last named arg if STRICT_ARGUMENT_NAMING is defined. - (If no anonymous args follow, the result of list_length is actually - one too large. This is harmless.) - - If SETUP_INCOMING_VARARGS is defined and STRICT_ARGUMENT_NAMING is not, - this machine will be able to place unnamed args that were passed in - registers into the stack. So treat all args as named. This allows the - insns emitting for a specific argument list to be independent of the - function declaration. - - If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable - way to pass unnamed args in registers, so we must force them into - memory. */ -#if !defined(SETUP_INCOMING_VARARGS) || defined(STRICT_ARGUMENT_NAMING) - if (TYPE_ARG_TYPES (funtype) != 0) - n_named_args - = (list_length (TYPE_ARG_TYPES (funtype)) -#ifndef STRICT_ARGUMENT_NAMING - /* Don't include the last named arg. */ - - 1 -#endif - /* Count the struct value address, if it is passed as a parm. */ - + structure_value_addr_parm); - else -#endif - /* If we know nothing, treat all args as named. */ - n_named_args = num_actuals; - - /* Make a vector to hold all the information about each arg. */ - args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); - bzero ((char *) args, num_actuals * sizeof (struct arg_data)); - - args_size.constant = 0; - args_size.var = 0; - - /* In this loop, we consider args in the order they are written. - We fill up ARGS from the front or from the back if necessary - so that in any case the first arg to be pushed ends up at the front. */ - -#ifdef PUSH_ARGS_REVERSED - i = num_actuals - 1, inc = -1; - /* In this case, must reverse order of args - so that we compute and push the last arg first. */ -#else - i = 0, inc = 1; -#endif - - /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ - for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) - { - tree type = TREE_TYPE (TREE_VALUE (p)); - int unsignedp; - enum machine_mode mode; - - args[i].tree_value = TREE_VALUE (p); - - /* Replace erroneous argument with constant zero. */ - if (type == error_mark_node || TYPE_SIZE (type) == 0) - args[i].tree_value = integer_zero_node, type = integer_type_node; - - /* If TYPE is a transparent union, pass things the way we would - pass the first field of the union. We have already verified that - the modes are the same. */ - if (TYPE_TRANSPARENT_UNION (type)) - type = TREE_TYPE (TYPE_FIELDS (type)); - - /* Decide where to pass this arg. - - args[i].reg is nonzero if all or part is passed in registers. - - args[i].partial is nonzero if part but not all is passed in registers, - and the exact value says how many words are passed in registers. - - args[i].pass_on_stack is nonzero if the argument must at least be - computed on the stack. It may then be loaded back into registers - if args[i].reg is nonzero. - - These decisions are driven by the FUNCTION_... macros and must agree - with those made by function.c. */ - - /* See if this argument should be passed by invisible reference. */ - if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST - && contains_placeholder_p (TYPE_SIZE (type))) - || TREE_ADDRESSABLE (type) -#ifdef FUNCTION_ARG_PASS_BY_REFERENCE - || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), - type, argpos < n_named_args) -#endif - ) - { -#ifdef FUNCTION_ARG_CALLEE_COPIES - if (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type), type, - argpos < n_named_args) - /* If it's in a register, we must make a copy of it too. */ - /* ??? Is this a sufficient test? Is there a better one? */ - && !(TREE_CODE (args[i].tree_value) == VAR_DECL - && REG_P (DECL_RTL (args[i].tree_value))) - && ! TREE_ADDRESSABLE (type)) - { - args[i].tree_value = build1 (ADDR_EXPR, - build_pointer_type (type), - args[i].tree_value); - type = build_pointer_type (type); - } - else -#endif - { - /* We make a copy of the object and pass the address to the - function being called. */ - rtx copy; - - if (TYPE_SIZE (type) == 0 - || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) - { - /* This is a variable-sized object. Make space on the stack - for it. */ - rtx size_rtx = expr_size (TREE_VALUE (p)); - - if (old_stack_level == 0) - { - emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); - old_pending_adj = pending_stack_adjust; - pending_stack_adjust = 0; - } - - copy = gen_rtx (MEM, BLKmode, - allocate_dynamic_stack_space (size_rtx, - NULL_RTX, - TYPE_ALIGN (type))); - } - else - { - int size = int_size_in_bytes (type); - copy = assign_stack_temp (TYPE_MODE (type), size, 0); - } - - MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type); - - store_expr (args[i].tree_value, copy, 0); - is_const = 0; - - args[i].tree_value = build1 (ADDR_EXPR, - build_pointer_type (type), - make_tree (type, copy)); - type = build_pointer_type (type); - } - } - - mode = TYPE_MODE (type); - unsignedp = TREE_UNSIGNED (type); - -#ifdef PROMOTE_FUNCTION_ARGS - mode = promote_mode (type, mode, &unsignedp, 1); -#endif - - args[i].unsignedp = unsignedp; - args[i].mode = mode; - args[i].reg = FUNCTION_ARG (args_so_far, mode, type, - argpos < n_named_args); -#ifdef FUNCTION_ARG_PARTIAL_NREGS - if (args[i].reg) - args[i].partial - = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type, - argpos < n_named_args); -#endif - - args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); - - /* If FUNCTION_ARG returned an (expr_list (nil) FOO), it means that - we are to pass this arg in the register(s) designated by FOO, but - also to pass it in the stack. */ - if (args[i].reg && GET_CODE (args[i].reg) == EXPR_LIST - && XEXP (args[i].reg, 0) == 0) - args[i].pass_on_stack = 1, args[i].reg = XEXP (args[i].reg, 1); - - /* If this is an addressable type, we must preallocate the stack - since we must evaluate the object into its final location. - - If this is to be passed in both registers and the stack, it is simpler - to preallocate. */ - if (TREE_ADDRESSABLE (type) - || (args[i].pass_on_stack && args[i].reg != 0)) - must_preallocate = 1; - - /* If this is an addressable type, we cannot pre-evaluate it. Thus, - we cannot consider this function call constant. */ - if (TREE_ADDRESSABLE (type)) - is_const = 0; - - /* Compute the stack-size of this argument. */ - if (args[i].reg == 0 || args[i].partial != 0 -#ifdef REG_PARM_STACK_SPACE - || reg_parm_stack_space > 0 -#endif - || args[i].pass_on_stack) - locate_and_pad_parm (mode, type, -#ifdef STACK_PARMS_IN_REG_PARM_AREA - 1, -#else - args[i].reg != 0, -#endif - fndecl, &args_size, &args[i].offset, - &args[i].size); - -#ifndef ARGS_GROW_DOWNWARD - args[i].slot_offset = args_size; -#endif - -#ifndef REG_PARM_STACK_SPACE - /* If a part of the arg was put into registers, - don't include that part in the amount pushed. */ - if (! args[i].pass_on_stack) - args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) - / (PARM_BOUNDARY / BITS_PER_UNIT) - * (PARM_BOUNDARY / BITS_PER_UNIT)); -#endif - - /* Update ARGS_SIZE, the total stack space for args so far. */ - - args_size.constant += args[i].size.constant; - if (args[i].size.var) - { - ADD_PARM_SIZE (args_size, args[i].size.var); - } - - /* Since the slot offset points to the bottom of the slot, - we must record it after incrementing if the args grow down. */ -#ifdef ARGS_GROW_DOWNWARD - args[i].slot_offset = args_size; - - args[i].slot_offset.constant = -args_size.constant; - if (args_size.var) - { - SUB_PARM_SIZE (args[i].slot_offset, args_size.var); - } -#endif - - /* Increment ARGS_SO_FAR, which has info about which arg-registers - have been used, etc. */ - - FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type, - argpos < n_named_args); - } - -#ifdef FINAL_REG_PARM_STACK_SPACE - reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, - args_size.var); -#endif - - /* Compute the actual size of the argument block required. The variable - and constant sizes must be combined, the size may have to be rounded, - and there may be a minimum required size. */ - - original_args_size = args_size; - if (args_size.var) - { - /* If this function requires a variable-sized argument list, don't try to - make a cse'able block for this call. We may be able to do this - eventually, but it is too complicated to keep track of what insns go - in the cse'able block and which don't. */ - - is_const = 0; - must_preallocate = 1; - - args_size.var = ARGS_SIZE_TREE (args_size); - args_size.constant = 0; - -#ifdef STACK_BOUNDARY - if (STACK_BOUNDARY != BITS_PER_UNIT) - args_size.var = round_up (args_size.var, STACK_BYTES); -#endif - -#ifdef REG_PARM_STACK_SPACE - if (reg_parm_stack_space > 0) - { - args_size.var - = size_binop (MAX_EXPR, args_size.var, - size_int (REG_PARM_STACK_SPACE (fndecl))); - -#ifndef OUTGOING_REG_PARM_STACK_SPACE - /* The area corresponding to register parameters is not to count in - the size of the block we need. So make the adjustment. */ - args_size.var - = size_binop (MINUS_EXPR, args_size.var, - size_int (reg_parm_stack_space)); -#endif - } -#endif - } - else - { -#ifdef STACK_BOUNDARY - args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) - / STACK_BYTES) * STACK_BYTES); -#endif - -#ifdef REG_PARM_STACK_SPACE - args_size.constant = MAX (args_size.constant, - reg_parm_stack_space); -#ifdef MAYBE_REG_PARM_STACK_SPACE - if (reg_parm_stack_space == 0) - args_size.constant = 0; -#endif -#ifndef OUTGOING_REG_PARM_STACK_SPACE - args_size.constant -= reg_parm_stack_space; -#endif -#endif - } - - /* See if we have or want to preallocate stack space. - - If we would have to push a partially-in-regs parm - before other stack parms, preallocate stack space instead. - - If the size of some parm is not a multiple of the required stack - alignment, we must preallocate. - - If the total size of arguments that would otherwise create a copy in - a temporary (such as a CALL) is more than half the total argument list - size, preallocation is faster. - - Another reason to preallocate is if we have a machine (like the m88k) - where stack alignment is required to be maintained between every - pair of insns, not just when the call is made. However, we assume here - that such machines either do not have push insns (and hence preallocation - would occur anyway) or the problem is taken care of with - PUSH_ROUNDING. */ - - if (! must_preallocate) - { - int partial_seen = 0; - int copy_to_evaluate_size = 0; - - for (i = 0; i < num_actuals && ! must_preallocate; i++) - { - if (args[i].partial > 0 && ! args[i].pass_on_stack) - partial_seen = 1; - else if (partial_seen && args[i].reg == 0) - must_preallocate = 1; - - if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode - && (TREE_CODE (args[i].tree_value) == CALL_EXPR - || TREE_CODE (args[i].tree_value) == TARGET_EXPR - || TREE_CODE (args[i].tree_value) == COND_EXPR - || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) - copy_to_evaluate_size - += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); - } - - if (copy_to_evaluate_size * 2 >= args_size.constant - && args_size.constant > 0) - must_preallocate = 1; - } - - /* If the structure value address will reference the stack pointer, we must - stabilize it. We don't need to do this if we know that we are not going - to adjust the stack pointer in processing this call. */ - - if (structure_value_addr - && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) - || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr)) - && (args_size.var -#ifndef ACCUMULATE_OUTGOING_ARGS - || args_size.constant -#endif - )) - structure_value_addr = copy_to_reg (structure_value_addr); - - /* If this function call is cse'able, precompute all the parameters. - Note that if the parameter is constructed into a temporary, this will - cause an additional copy because the parameter will be constructed - into a temporary location and then copied into the outgoing arguments. - If a parameter contains a call to alloca and this function uses the - stack, precompute the parameter. */ - - /* If we preallocated the stack space, and some arguments must be passed - on the stack, then we must precompute any parameter which contains a - function call which will store arguments on the stack. - Otherwise, evaluating the parameter may clobber previous parameters - which have already been stored into the stack. */ - - for (i = 0; i < num_actuals; i++) - if (is_const - || ((args_size.var != 0 || args_size.constant != 0) - && calls_function (args[i].tree_value, 1)) - || (must_preallocate && (args_size.var != 0 || args_size.constant != 0) - && calls_function (args[i].tree_value, 0))) - { - /* If this is an addressable type, we cannot pre-evaluate it. */ - if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) - abort (); - - push_temp_slots (); - - args[i].initial_value = args[i].value - = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); - - preserve_temp_slots (args[i].value); - pop_temp_slots (); - - /* ANSI doesn't require a sequence point here, - but PCC has one, so this will avoid some problems. */ - emit_queue (); - - args[i].initial_value = args[i].value - = protect_from_queue (args[i].initial_value, 0); - - if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode) - args[i].value - = convert_modes (args[i].mode, - TYPE_MODE (TREE_TYPE (args[i].tree_value)), - args[i].value, args[i].unsignedp); - } - - /* Now we are about to start emitting insns that can be deleted - if a libcall is deleted. */ - if (is_const) - start_sequence (); - - /* If we have no actual push instructions, or shouldn't use them, - make space for all args right now. */ - - if (args_size.var != 0) - { - if (old_stack_level == 0) - { - emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); - old_pending_adj = pending_stack_adjust; - pending_stack_adjust = 0; -#ifdef ACCUMULATE_OUTGOING_ARGS - /* stack_arg_under_construction says whether a stack arg is - being constructed at the old stack level. Pushing the stack - gets a clean outgoing argument block. */ - old_stack_arg_under_construction = stack_arg_under_construction; - stack_arg_under_construction = 0; -#endif - } - argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0); - } - else - { - /* Note that we must go through the motions of allocating an argument - block even if the size is zero because we may be storing args - in the area reserved for register arguments, which may be part of - the stack frame. */ - - int needed = args_size.constant; - - /* Store the maximum argument space used. It will be pushed by the - prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow checking). */ - - if (needed > current_function_outgoing_args_size) - current_function_outgoing_args_size = needed; - - if (must_preallocate) - { -#ifdef ACCUMULATE_OUTGOING_ARGS - /* Since the stack pointer will never be pushed, it is possible for - the evaluation of a parm to clobber something we have already - written to the stack. Since most function calls on RISC machines - do not use the stack, this is uncommon, but must work correctly. - - Therefore, we save any area of the stack that was already written - and that we are using. Here we set up to do this by making a new - stack usage map from the old one. The actual save will be done - by store_one_arg. - - Another approach might be to try to reorder the argument - evaluations to avoid this conflicting stack usage. */ - -#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) - /* Since we will be writing into the entire argument area, the - map must be allocated for its entire size, not just the part that - is the responsibility of the caller. */ - needed += reg_parm_stack_space; -#endif - -#ifdef ARGS_GROW_DOWNWARD - highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, - needed + 1); -#else - highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, - needed); -#endif - stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); - - if (initial_highest_arg_in_use) - bcopy (initial_stack_usage_map, stack_usage_map, - initial_highest_arg_in_use); - - if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) - bzero (&stack_usage_map[initial_highest_arg_in_use], - highest_outgoing_arg_in_use - initial_highest_arg_in_use); - needed = 0; - - /* The address of the outgoing argument list must not be copied to a - register here, because argblock would be left pointing to the - wrong place after the call to allocate_dynamic_stack_space below. - */ - - argblock = virtual_outgoing_args_rtx; - -#else /* not ACCUMULATE_OUTGOING_ARGS */ - if (inhibit_defer_pop == 0) - { - /* Try to reuse some or all of the pending_stack_adjust - to get this space. Maybe we can avoid any pushing. */ - if (needed > pending_stack_adjust) - { - needed -= pending_stack_adjust; - pending_stack_adjust = 0; - } - else - { - pending_stack_adjust -= needed; - needed = 0; - } - } - /* Special case this because overhead of `push_block' in this - case is non-trivial. */ - if (needed == 0) - argblock = virtual_outgoing_args_rtx; - else - argblock = push_block (GEN_INT (needed), 0, 0); - - /* We only really need to call `copy_to_reg' in the case where push - insns are going to be used to pass ARGBLOCK to a function - call in ARGS. In that case, the stack pointer changes value - from the allocation point to the call point, and hence - the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well. - But might as well always do it. */ - argblock = copy_to_reg (argblock); -#endif /* not ACCUMULATE_OUTGOING_ARGS */ - } - } - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* The save/restore code in store_one_arg handles all cases except one: - a constructor call (including a C function returning a BLKmode struct) - to initialize an argument. */ - if (stack_arg_under_construction) - { -#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) - rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant); -#else - rtx push_size = GEN_INT (args_size.constant); -#endif - if (old_stack_level == 0) - { - emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); - old_pending_adj = pending_stack_adjust; - pending_stack_adjust = 0; - /* stack_arg_under_construction says whether a stack arg is - being constructed at the old stack level. Pushing the stack - gets a clean outgoing argument block. */ - old_stack_arg_under_construction = stack_arg_under_construction; - stack_arg_under_construction = 0; - /* Make a new map for the new argument list. */ - stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use); - bzero (stack_usage_map, highest_outgoing_arg_in_use); - highest_outgoing_arg_in_use = 0; - } - allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT); - } - /* If argument evaluation might modify the stack pointer, copy the - address of the argument list to a register. */ - for (i = 0; i < num_actuals; i++) - if (args[i].pass_on_stack) - { - argblock = copy_addr_to_reg (argblock); - break; - } -#endif - - - /* If we preallocated stack space, compute the address of each argument. - We need not ensure it is a valid memory address here; it will be - validized when it is used. */ - if (argblock) - { - rtx arg_reg = argblock; - int arg_offset = 0; - - if (GET_CODE (argblock) == PLUS) - arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); - - for (i = 0; i < num_actuals; i++) - { - rtx offset = ARGS_SIZE_RTX (args[i].offset); - rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); - rtx addr; - - /* Skip this parm if it will not be passed on the stack. */ - if (! args[i].pass_on_stack && args[i].reg != 0) - continue; - - if (GET_CODE (offset) == CONST_INT) - addr = plus_constant (arg_reg, INTVAL (offset)); - else - addr = gen_rtx (PLUS, Pmode, arg_reg, offset); - - addr = plus_constant (addr, arg_offset); - args[i].stack = gen_rtx (MEM, args[i].mode, addr); - MEM_IN_STRUCT_P (args[i].stack) - = AGGREGATE_TYPE_P (TREE_TYPE (args[i].tree_value)); - - if (GET_CODE (slot_offset) == CONST_INT) - addr = plus_constant (arg_reg, INTVAL (slot_offset)); - else - addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset); - - addr = plus_constant (addr, arg_offset); - args[i].stack_slot = gen_rtx (MEM, args[i].mode, addr); - } - } - -#ifdef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we push args individually in reverse order, perform stack alignment - before the first push (the last arg). */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - - /* Don't try to defer pops if preallocating, not even from the first arg, - since ARGBLOCK probably refers to the SP. */ - if (argblock) - NO_DEFER_POP; - - /* Get the function to call, in the form of RTL. */ - if (fndecl) - { - /* If this is the first use of the function, see if we need to - make an external definition for it. */ - if (! TREE_USED (fndecl)) - { - assemble_external (fndecl); - TREE_USED (fndecl) = 1; - } - - /* Get a SYMBOL_REF rtx for the function address. */ - funexp = XEXP (DECL_RTL (fndecl), 0); - } - else - /* Generate an rtx (probably a pseudo-register) for the address. */ - { - push_temp_slots (); - funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); - pop_temp_slots (); /* FUNEXP can't be BLKmode */ - emit_queue (); - } - - /* Figure out the register where the value, if any, will come back. */ - valreg = 0; - if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode - && ! structure_value_addr) - { - if (pcc_struct_value) - valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), - fndecl); - else - valreg = hard_function_value (TREE_TYPE (exp), fndecl); - } - - /* Precompute all register parameters. It isn't safe to compute anything - once we have started filling any specific hard regs. */ - reg_parm_seen = 0; - for (i = 0; i < num_actuals; i++) - if (args[i].reg != 0 && ! args[i].pass_on_stack) - { - reg_parm_seen = 1; - - if (args[i].value == 0) - { - push_temp_slots (); - args[i].value = expand_expr (args[i].tree_value, NULL_RTX, - VOIDmode, 0); - preserve_temp_slots (args[i].value); - pop_temp_slots (); - - /* ANSI doesn't require a sequence point here, - but PCC has one, so this will avoid some problems. */ - emit_queue (); - } - - /* If we are to promote the function arg to a wider mode, - do it now. */ - - if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) - args[i].value - = convert_modes (args[i].mode, - TYPE_MODE (TREE_TYPE (args[i].tree_value)), - args[i].value, args[i].unsignedp); - - /* If the value is expensive, and we are inside an appropriately - short loop, put the value into a pseudo and then put the pseudo - into the hard reg. - - For small register classes, also do this if this call uses - register parameters. This is to avoid reload conflicts while - loading the parameters registers. */ - - if ((! (GET_CODE (args[i].value) == REG - || (GET_CODE (args[i].value) == SUBREG - && GET_CODE (SUBREG_REG (args[i].value)) == REG))) - && args[i].mode != BLKmode - && rtx_cost (args[i].value, SET) > 2 -#ifdef SMALL_REGISTER_CLASSES - && (reg_parm_seen || preserve_subexpressions_p ()) -#else - && preserve_subexpressions_p () -#endif - ) - args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); - } - -#if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) - /* The argument list is the property of the called routine and it - may clobber it. If the fixed area has been used for previous - parameters, we must save and restore it. - - Here we compute the boundary of the that needs to be saved, if any. */ - -#ifdef ARGS_GROW_DOWNWARD - for (i = 0; i < reg_parm_stack_space + 1; i++) -#else - for (i = 0; i < reg_parm_stack_space; i++) -#endif - { - if (i >= highest_outgoing_arg_in_use - || stack_usage_map[i] == 0) - continue; - - if (low_to_save == -1) - low_to_save = i; - - high_to_save = i; - } - - if (low_to_save >= 0) - { - int num_to_save = high_to_save - low_to_save + 1; - enum machine_mode save_mode - = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); - rtx stack_area; - - /* If we don't have the required alignment, must do this in BLKmode. */ - if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), - BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) - save_mode = BLKmode; - - stack_area = gen_rtx (MEM, save_mode, - memory_address (save_mode, - -#ifdef ARGS_GROW_DOWNWARD - plus_constant (argblock, - - high_to_save) -#else - plus_constant (argblock, - low_to_save) -#endif - )); - if (save_mode == BLKmode) - { - save_area = assign_stack_temp (BLKmode, num_to_save, 0); - MEM_IN_STRUCT_P (save_area) = 0; - emit_block_move (validize_mem (save_area), stack_area, - GEN_INT (num_to_save), - PARM_BOUNDARY / BITS_PER_UNIT); - } - else - { - save_area = gen_reg_rtx (save_mode); - emit_move_insn (save_area, stack_area); - } - } -#endif - - - /* Now store (and compute if necessary) all non-register parms. - These come before register parms, since they can require block-moves, - which could clobber the registers used for register parms. - Parms which have partial registers are not stored here, - but we do preallocate space here if they want that. */ - - for (i = 0; i < num_actuals; i++) - if (args[i].reg == 0 || args[i].pass_on_stack) - store_one_arg (&args[i], argblock, may_be_alloca, - args_size.var != 0, fndecl, reg_parm_stack_space); - - /* If we have a parm that is passed in registers but not in memory - and whose alignment does not permit a direct copy into registers, - make a group of pseudos that correspond to each register that we - will later fill. */ - - if (STRICT_ALIGNMENT) - for (i = 0; i < num_actuals; i++) - if (args[i].reg != 0 && ! args[i].pass_on_stack - && args[i].mode == BLKmode - && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) - < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) - { - int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); - int big_endian_correction = 0; - - args[i].n_aligned_regs - = args[i].partial ? args[i].partial - : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; - - args[i].aligned_regs = (rtx *) alloca (sizeof (rtx) - * args[i].n_aligned_regs); - - /* Structures smaller than a word are aligned to the least - significant byte (to the right). On a BYTES_BIG_ENDIAN machine, - this means we must skip the empty high order bytes when - calculating the bit offset. */ - if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) - big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); - - for (j = 0; j < args[i].n_aligned_regs; j++) - { - rtx reg = gen_reg_rtx (word_mode); - rtx word = operand_subword_force (args[i].value, j, BLKmode); - int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); - int bitpos; - - args[i].aligned_regs[j] = reg; - - /* Clobber REG and move each partword into it. Ensure we don't - go past the end of the structure. Note that the loop below - works because we've already verified that padding - and endianness are compatible. */ - - emit_insn (gen_rtx (CLOBBER, VOIDmode, reg)); - - for (bitpos = 0; - bitpos < BITS_PER_WORD && bytes > 0; - bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT) - { - int xbitpos = bitpos + big_endian_correction; - - store_bit_field (reg, bitsize, xbitpos, word_mode, - extract_bit_field (word, bitsize, bitpos, 1, - NULL_RTX, word_mode, - word_mode, - bitsize / BITS_PER_UNIT, - BITS_PER_WORD), - bitsize / BITS_PER_UNIT, BITS_PER_WORD); - } - } - } - - /* Now store any partially-in-registers parm. - This is the last place a block-move can happen. */ - if (reg_parm_seen) - for (i = 0; i < num_actuals; i++) - if (args[i].partial != 0 && ! args[i].pass_on_stack) - store_one_arg (&args[i], argblock, may_be_alloca, - args_size.var != 0, fndecl, reg_parm_stack_space); - -#ifndef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we pushed args in forward order, perform stack alignment - after pushing the last arg. */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - - /* If register arguments require space on the stack and stack space - was not preallocated, allocate stack space here for arguments - passed in registers. */ -#if ! defined(ACCUMULATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE) - if (must_preallocate == 0 && reg_parm_stack_space > 0) - anti_adjust_stack (GEN_INT (reg_parm_stack_space)); -#endif - - /* Pass the function the address in which to return a structure value. */ - if (structure_value_addr && ! structure_value_addr_parm) - { - emit_move_insn (struct_value_rtx, - force_reg (Pmode, - force_operand (structure_value_addr, - NULL_RTX))); - if (GET_CODE (struct_value_rtx) == REG) - use_reg (&call_fusage, struct_value_rtx); - } - - funexp = prepare_call_address (funexp, fndecl, &call_fusage, reg_parm_seen); - - /* Now do the register loads required for any wholly-register parms or any - parms which are passed both on the stack and in a register. Their - expressions were already evaluated. - - Mark all register-parms as living through the call, putting these USE - insns in the CALL_INSN_FUNCTION_USAGE field. */ - - for (i = 0; i < num_actuals; i++) - { - rtx list = args[i].reg; - int partial = args[i].partial; - - while (list) - { - rtx reg; - int nregs; - - /* Process each register that needs to get this arg. */ - if (GET_CODE (list) == EXPR_LIST) - reg = XEXP (list, 0), list = XEXP (list, 1); - else - reg = list, list = 0; - - /* Set to non-negative if must move a word at a time, even if just - one word (e.g, partial == 1 && mode == DFmode). Set to -1 if - we just use a normal move insn. This value can be zero if the - argument is a zero size structure with no fields. */ - nregs = (partial ? partial - : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode - ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) - + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) - : -1)); - - /* If simple case, just do move. If normal partial, store_one_arg - has already loaded the register for us. In all other cases, - load the register(s) from memory. */ - - if (nregs == -1) - emit_move_insn (reg, args[i].value); - - /* If we have pre-computed the values to put in the registers in - the case of non-aligned structures, copy them in now. */ - - else if (args[i].n_aligned_regs != 0) - for (j = 0; j < args[i].n_aligned_regs; j++) - emit_move_insn (gen_rtx (REG, word_mode, REGNO (reg) + j), - args[i].aligned_regs[j]); - - else if (args[i].partial == 0 || args[i].pass_on_stack) - move_block_to_reg (REGNO (reg), - validize_mem (args[i].value), nregs, - args[i].mode); - - if (nregs == -1) - use_reg (&call_fusage, reg); - else - use_regs (&call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); - - /* PARTIAL referred only to the first register, so clear it for the - next time. */ - partial = 0; - } - } - - /* Perform postincrements before actually calling the function. */ - emit_queue (); - - /* All arguments and registers used for the call must be set up by now! */ - - /* Generate the actual call instruction. */ - emit_call_1 (funexp, fndecl, funtype, args_size.constant, struct_value_size, - FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), - valreg, old_inhibit_defer_pop, call_fusage, is_const); - - /* If call is cse'able, make appropriate pair of reg-notes around it. - Test valreg so we don't crash; may safely ignore `const' - if return type is void. */ - if (is_const && valreg != 0) - { - rtx note = 0; - rtx temp = gen_reg_rtx (GET_MODE (valreg)); - rtx insns; - - /* Construct an "equal form" for the value which mentions all the - arguments in order as well as the function name. */ -#ifdef PUSH_ARGS_REVERSED - for (i = 0; i < num_actuals; i++) - note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); -#else - for (i = num_actuals - 1; i >= 0; i--) - note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); -#endif - note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note); - - insns = get_insns (); - end_sequence (); - - emit_libcall_block (insns, temp, valreg, note); - - valreg = temp; - } - else if (is_const) - { - /* Otherwise, just write out the sequence without a note. */ - rtx insns = get_insns (); - - end_sequence (); - emit_insns (insns); - } - - /* For calls to `setjmp', etc., inform flow.c it should complain - if nonvolatile values are live. */ - - if (returns_twice) - { - emit_note (name, NOTE_INSN_SETJMP); - current_function_calls_setjmp = 1; - } - - if (is_longjmp) - current_function_calls_longjmp = 1; - - /* Notice functions that cannot return. - If optimizing, insns emitted below will be dead. - If not optimizing, they will exist, which is useful - if the user uses the `return' command in the debugger. */ - - if (is_volatile || is_longjmp) - emit_barrier (); - - /* If value type not void, return an rtx for the value. */ - - /* If there are cleanups to be called, don't use a hard reg as target. */ - if (cleanups_this_call != old_cleanups - && target && REG_P (target) - && REGNO (target) < FIRST_PSEUDO_REGISTER) - target = 0; - - if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode - || ignore) - { - target = const0_rtx; - } - else if (structure_value_addr) - { - if (target == 0 || GET_CODE (target) != MEM) - { - target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), - memory_address (TYPE_MODE (TREE_TYPE (exp)), - structure_value_addr)); - MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); - } - } - else if (pcc_struct_value) - { - if (target == 0) - { - /* We used leave the value in the location that it is - returned in, but that causes problems if it is used more - than once in one expression. Rather than trying to track - when a copy is required, we always copy when TARGET is - not specified. This calling sequence is only used on - a few machines and TARGET is usually nonzero. */ - if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) - { - target = assign_stack_temp (BLKmode, - int_size_in_bytes (TREE_TYPE (exp)), - 0); - - MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); - - /* Save this temp slot around the pop below. */ - preserve_temp_slots (target); - } - else - target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); - } - - if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode) - emit_move_insn (target, gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), - copy_to_reg (valreg))); - else - emit_block_move (target, gen_rtx (MEM, BLKmode, copy_to_reg (valreg)), - expr_size (exp), - TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); - } - else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) - && GET_MODE (target) == GET_MODE (valreg)) - /* TARGET and VALREG cannot be equal at this point because the latter - would not have REG_FUNCTION_VALUE_P true, while the former would if - it were referring to the same register. - - If they refer to the same register, this move will be a no-op, except - when function inlining is being done. */ - emit_move_insn (target, valreg); - else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) - { - /* Some machines (the PA for example) want to return all small - structures in registers regardless of the structure's alignment. - - Deal with them explicitly by copying from the return registers - into the target MEM locations. */ - int bytes = int_size_in_bytes (TREE_TYPE (exp)); - int n_regs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; - int i; - enum machine_mode tmpmode; - rtx src, dst; - int bitsize = MIN (TYPE_ALIGN (TREE_TYPE (exp)), BITS_PER_WORD); - int bitpos, xbitpos, big_endian_correction = 0; - - if (target == 0) - { - target = assign_stack_temp (BLKmode, bytes, 0); - MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); - preserve_temp_slots (target); - } - - /* This code assumes valreg is at least a full word. If it isn't, - copy it into a new pseudo which is a full word. */ - if (GET_MODE (valreg) != BLKmode - && GET_MODE_SIZE (GET_MODE (valreg)) < UNITS_PER_WORD) - valreg = convert_to_mode (SImode, valreg, - TREE_UNSIGNED (TREE_TYPE (exp))); - - /* Structures whose size is not a multiple of a word are aligned - to the least significant byte (to the right). On a BYTES_BIG_ENDIAN - machine, this means we must skip the empty high order bytes when - calculating the bit offset. */ - if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD) - big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) - * BITS_PER_UNIT)); - - /* Copy the structure BITSIZE bites at a time. - - We could probably emit more efficient code for machines - which do not use strict alignment, but it doesn't seem - worth the effort at the current time. */ - for (bitpos = 0, xbitpos = big_endian_correction; - bitpos < bytes * BITS_PER_UNIT; - bitpos += bitsize, xbitpos += bitsize) - { - - /* We need a new source operand each time xbitpos is on a - word boundary and when xbitpos == big_endian_correction - (the first time through). */ - if (xbitpos % BITS_PER_WORD == 0 - || xbitpos == big_endian_correction) - src = operand_subword_force (valreg, - xbitpos / BITS_PER_WORD, - BLKmode); - - /* We need a new destination operand each time bitpos is on - a word boundary. */ - if (bitpos % BITS_PER_WORD == 0) - dst = operand_subword (target, bitpos / BITS_PER_WORD, 1, BLKmode); - - /* Use xbitpos for the source extraction (right justified) and - xbitpos for the destination store (left justified). */ - store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode, - extract_bit_field (src, bitsize, - xbitpos % BITS_PER_WORD, 1, - NULL_RTX, word_mode, - word_mode, - bitsize / BITS_PER_UNIT, - BITS_PER_WORD), - bitsize / BITS_PER_UNIT, BITS_PER_WORD); - } - } - else - target = copy_to_reg (valreg); - -#ifdef PROMOTE_FUNCTION_RETURN - /* If we promoted this return value, make the proper SUBREG. TARGET - might be const0_rtx here, so be careful. */ - if (GET_CODE (target) == REG - && TYPE_MODE (TREE_TYPE (exp)) != BLKmode - && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) - { - tree type = TREE_TYPE (exp); - int unsignedp = TREE_UNSIGNED (type); - - /* If we don't promote as expected, something is wrong. */ - if (GET_MODE (target) - != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) - abort (); - - target = gen_rtx (SUBREG, TYPE_MODE (type), target, 0); - SUBREG_PROMOTED_VAR_P (target) = 1; - SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; - } -#endif - - if (flag_short_temps) - { - /* Perform all cleanups needed for the arguments of this call - (i.e. destructors in C++). */ - expand_cleanups_to (old_cleanups); - } - - /* If size of args is variable or this was a constructor call for a stack - argument, restore saved stack-pointer value. */ - - if (old_stack_level) - { - emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); - pending_stack_adjust = old_pending_adj; -#ifdef ACCUMULATE_OUTGOING_ARGS - stack_arg_under_construction = old_stack_arg_under_construction; - highest_outgoing_arg_in_use = initial_highest_arg_in_use; - stack_usage_map = initial_stack_usage_map; -#endif - } -#ifdef ACCUMULATE_OUTGOING_ARGS - else - { -#ifdef REG_PARM_STACK_SPACE - if (save_area) - { - enum machine_mode save_mode = GET_MODE (save_area); - rtx stack_area - = gen_rtx (MEM, save_mode, - memory_address (save_mode, -#ifdef ARGS_GROW_DOWNWARD - plus_constant (argblock, - high_to_save) -#else - plus_constant (argblock, low_to_save) -#endif - )); - - if (save_mode != BLKmode) - emit_move_insn (stack_area, save_area); - else - emit_block_move (stack_area, validize_mem (save_area), - GEN_INT (high_to_save - low_to_save + 1), - PARM_BOUNDARY / BITS_PER_UNIT); - } -#endif - - /* If we saved any argument areas, restore them. */ - for (i = 0; i < num_actuals; i++) - if (args[i].save_area) - { - enum machine_mode save_mode = GET_MODE (args[i].save_area); - rtx stack_area - = gen_rtx (MEM, save_mode, - memory_address (save_mode, - XEXP (args[i].stack_slot, 0))); - - if (save_mode != BLKmode) - emit_move_insn (stack_area, args[i].save_area); - else - emit_block_move (stack_area, validize_mem (args[i].save_area), - GEN_INT (args[i].size.constant), - PARM_BOUNDARY / BITS_PER_UNIT); - } - - highest_outgoing_arg_in_use = initial_highest_arg_in_use; - stack_usage_map = initial_stack_usage_map; - } -#endif - - /* If this was alloca, record the new stack level for nonlocal gotos. - Check for the handler slots since we might not have a save area - for non-local gotos. */ - - if (may_be_alloca && nonlocal_goto_handler_slot != 0) - emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); - - pop_temp_slots (); - - return target; -} - -/* Output a library call to function FUN (a SYMBOL_REF rtx) - (emitting the queue unless NO_QUEUE is nonzero), - for a value of mode OUTMODE, - with NARGS different arguments, passed as alternating rtx values - and machine_modes to convert them to. - The rtx values should have been passed through protect_from_queue already. - - NO_QUEUE will be true if and only if the library call is a `const' call - which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent - to the variable is_const in expand_call. - - NO_QUEUE must be true for const calls, because if it isn't, then - any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes, - and will be lost if the libcall sequence is optimized away. - - NO_QUEUE must be false for non-const calls, because if it isn't, the - call insn will have its CONST_CALL_P bit set, and it will be incorrectly - optimized. For instance, the instruction scheduler may incorrectly - move memory references across the non-const call. */ - -void -emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode, - int nargs, ...)) -{ -#ifndef __STDC__ - rtx orgfun; - int no_queue; - enum machine_mode outmode; - int nargs; -#endif - va_list p; - /* Total size in bytes of all the stack-parms scanned so far. */ - struct args_size args_size; - /* Size of arguments before any adjustments (such as rounding). */ - struct args_size original_args_size; - register int argnum; - rtx fun; - int inc; - int count; - rtx argblock = 0; - CUMULATIVE_ARGS args_so_far; - struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; - struct args_size offset; struct args_size size; }; - struct arg *argvec; - int old_inhibit_defer_pop = inhibit_defer_pop; - rtx call_fusage = 0; - /* library calls are never indirect calls. */ - int current_call_is_indirect = 0; - - VA_START (p, nargs); - -#ifndef __STDC__ - orgfun = va_arg (p, rtx); - no_queue = va_arg (p, int); - outmode = va_arg (p, enum machine_mode); - nargs = va_arg (p, int); -#endif - - fun = orgfun; - - /* Copy all the libcall-arguments out of the varargs data - and into a vector ARGVEC. - - Compute how to pass each argument. We only support a very small subset - of the full argument passing conventions to limit complexity here since - library functions shouldn't have many args. */ - - argvec = (struct arg *) alloca (nargs * sizeof (struct arg)); - - INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); - - args_size.constant = 0; - args_size.var = 0; - - push_temp_slots (); - - for (count = 0; count < nargs; count++) - { - rtx val = va_arg (p, rtx); - enum machine_mode mode = va_arg (p, enum machine_mode); - - /* We cannot convert the arg value to the mode the library wants here; - must do it earlier where we know the signedness of the arg. */ - if (mode == BLKmode - || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) - abort (); - - /* On some machines, there's no way to pass a float to a library fcn. - Pass it as a double instead. */ -#ifdef LIBGCC_NEEDS_DOUBLE - if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) - val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; -#endif - - /* There's no need to call protect_from_queue, because - either emit_move_insn or emit_push_insn will do that. */ - - /* Make sure it is a reasonable operand for a move or push insn. */ - if (GET_CODE (val) != REG && GET_CODE (val) != MEM - && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) - val = force_operand (val, NULL_RTX); - -#ifdef FUNCTION_ARG_PASS_BY_REFERENCE - if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) - { - /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can - be viewed as just an efficiency improvement. */ - rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); - emit_move_insn (slot, val); - val = force_operand (XEXP (slot, 0), NULL_RTX); - mode = Pmode; - } -#endif - - argvec[count].value = val; - argvec[count].mode = mode; - - argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); - if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) - abort (); -#ifdef FUNCTION_ARG_PARTIAL_NREGS - argvec[count].partial - = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); -#else - argvec[count].partial = 0; -#endif - - locate_and_pad_parm (mode, NULL_TREE, - argvec[count].reg && argvec[count].partial == 0, - NULL_TREE, &args_size, &argvec[count].offset, - &argvec[count].size); - - if (argvec[count].size.var) - abort (); - -#ifndef REG_PARM_STACK_SPACE - if (argvec[count].partial) - argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; -#endif - - if (argvec[count].reg == 0 || argvec[count].partial != 0 -#ifdef REG_PARM_STACK_SPACE - || 1 -#endif - ) - args_size.constant += argvec[count].size.constant; - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* If this arg is actually passed on the stack, it might be - clobbering something we already put there (this library call might - be inside the evaluation of an argument to a function whose call - requires the stack). This will only occur when the library call - has sufficient args to run out of argument registers. Abort in - this case; if this ever occurs, code must be added to save and - restore the arg slot. */ - - if (argvec[count].reg == 0 || argvec[count].partial != 0) - abort (); -#endif - - FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); - } - va_end (p); - - /* If this machine requires an external definition for library - functions, write one out. */ - assemble_external_libcall (fun); - - original_args_size = args_size; -#ifdef STACK_BOUNDARY - args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) - / STACK_BYTES) * STACK_BYTES); -#endif - -#ifdef REG_PARM_STACK_SPACE - args_size.constant = MAX (args_size.constant, - REG_PARM_STACK_SPACE (NULL_TREE)); -#ifndef OUTGOING_REG_PARM_STACK_SPACE - args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); -#endif -#endif - - if (args_size.constant > current_function_outgoing_args_size) - current_function_outgoing_args_size = args_size.constant; - -#ifdef ACCUMULATE_OUTGOING_ARGS - args_size.constant = 0; -#endif - -#ifndef PUSH_ROUNDING - argblock = push_block (GEN_INT (args_size.constant), 0, 0); -#endif - -#ifdef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we push args individually in reverse order, perform stack alignment - before the first push (the last arg). */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - -#ifdef PUSH_ARGS_REVERSED - inc = -1; - argnum = nargs - 1; -#else - inc = 1; - argnum = 0; -#endif - - /* Push the args that need to be pushed. */ - - for (count = 0; count < nargs; count++, argnum += inc) - { - register enum machine_mode mode = argvec[argnum].mode; - register rtx val = argvec[argnum].value; - rtx reg = argvec[argnum].reg; - int partial = argvec[argnum].partial; - - if (! (reg != 0 && partial == 0)) - emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, - argblock, GEN_INT (argvec[count].offset.constant)); - NO_DEFER_POP; - } - -#ifndef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we pushed args in forward order, perform stack alignment - after pushing the last arg. */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - -#ifdef PUSH_ARGS_REVERSED - argnum = nargs - 1; -#else - argnum = 0; -#endif - - fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0); - - /* Now load any reg parms into their regs. */ - - for (count = 0; count < nargs; count++, argnum += inc) - { - register enum machine_mode mode = argvec[argnum].mode; - register rtx val = argvec[argnum].value; - rtx reg = argvec[argnum].reg; - int partial = argvec[argnum].partial; - - if (reg != 0 && partial == 0) - emit_move_insn (reg, val); - NO_DEFER_POP; - } - - /* For version 1.37, try deleting this entirely. */ - if (! no_queue) - emit_queue (); - - /* Any regs containing parms remain in use through the call. */ - for (count = 0; count < nargs; count++) - if (argvec[count].reg != 0) - use_reg (&call_fusage, argvec[count].reg); - - /* Don't allow popping to be deferred, since then - cse'ing of library calls could delete a call and leave the pop. */ - NO_DEFER_POP; - - /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which - will set inhibit_defer_pop to that value. */ - - emit_call_1 (fun, - get_identifier (XSTR (orgfun, 0)), - get_identifier (XSTR (orgfun, 0)), args_size.constant, 0, - FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), - outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX, - old_inhibit_defer_pop + 1, call_fusage, no_queue); - - pop_temp_slots (); - - /* Now restore inhibit_defer_pop to its actual original value. */ - OK_DEFER_POP; -} - -/* Like emit_library_call except that an extra argument, VALUE, - comes second and says where to store the result. - (If VALUE is zero, this function chooses a convenient way - to return the value. - - This function returns an rtx for where the value is to be found. - If VALUE is nonzero, VALUE is returned. */ - -rtx -emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue, - enum machine_mode outmode, int nargs, ...)) -{ -#ifndef __STDC__ - rtx orgfun; - rtx value; - int no_queue; - enum machine_mode outmode; - int nargs; -#endif - va_list p; - /* Total size in bytes of all the stack-parms scanned so far. */ - struct args_size args_size; - /* Size of arguments before any adjustments (such as rounding). */ - struct args_size original_args_size; - register int argnum; - rtx fun; - int inc; - int count; - rtx argblock = 0; - CUMULATIVE_ARGS args_so_far; - struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; - struct args_size offset; struct args_size size; }; - struct arg *argvec; - int old_inhibit_defer_pop = inhibit_defer_pop; - rtx call_fusage = 0; - rtx mem_value = 0; - int pcc_struct_value = 0; - int struct_value_size = 0; - /* library calls are never indirect calls. */ - int current_call_is_indirect = 0; - int is_const; - - VA_START (p, nargs); - -#ifndef __STDC__ - orgfun = va_arg (p, rtx); - value = va_arg (p, rtx); - no_queue = va_arg (p, int); - outmode = va_arg (p, enum machine_mode); - nargs = va_arg (p, int); -#endif - - is_const = no_queue; - fun = orgfun; - - /* If this kind of value comes back in memory, - decide where in memory it should come back. */ - if (aggregate_value_p (type_for_mode (outmode, 0))) - { -#ifdef PCC_STATIC_STRUCT_RETURN - rtx pointer_reg - = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)), - 0); - mem_value = gen_rtx (MEM, outmode, pointer_reg); - pcc_struct_value = 1; - if (value == 0) - value = gen_reg_rtx (outmode); -#else /* not PCC_STATIC_STRUCT_RETURN */ - struct_value_size = GET_MODE_SIZE (outmode); - if (value != 0 && GET_CODE (value) == MEM) - mem_value = value; - else - mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0); -#endif - - /* This call returns a big structure. */ - is_const = 0; - } - - /* ??? Unfinished: must pass the memory address as an argument. */ - - /* Copy all the libcall-arguments out of the varargs data - and into a vector ARGVEC. - - Compute how to pass each argument. We only support a very small subset - of the full argument passing conventions to limit complexity here since - library functions shouldn't have many args. */ - - argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); - - INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); - - args_size.constant = 0; - args_size.var = 0; - - count = 0; - - push_temp_slots (); - - /* If there's a structure value address to be passed, - either pass it in the special place, or pass it as an extra argument. */ - if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) - { - rtx addr = XEXP (mem_value, 0); - nargs++; - - /* Make sure it is a reasonable operand for a move or push insn. */ - if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM - && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) - addr = force_operand (addr, NULL_RTX); - - argvec[count].value = addr; - argvec[count].mode = Pmode; - argvec[count].partial = 0; - - argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); -#ifdef FUNCTION_ARG_PARTIAL_NREGS - if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) - abort (); -#endif - - locate_and_pad_parm (Pmode, NULL_TREE, - argvec[count].reg && argvec[count].partial == 0, - NULL_TREE, &args_size, &argvec[count].offset, - &argvec[count].size); - - - if (argvec[count].reg == 0 || argvec[count].partial != 0 -#ifdef REG_PARM_STACK_SPACE - || 1 -#endif - ) - args_size.constant += argvec[count].size.constant; - - FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree)0, 1); - - count++; - } - - for (; count < nargs; count++) - { - rtx val = va_arg (p, rtx); - enum machine_mode mode = va_arg (p, enum machine_mode); - - /* We cannot convert the arg value to the mode the library wants here; - must do it earlier where we know the signedness of the arg. */ - if (mode == BLKmode - || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) - abort (); - - /* On some machines, there's no way to pass a float to a library fcn. - Pass it as a double instead. */ -#ifdef LIBGCC_NEEDS_DOUBLE - if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) - val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; -#endif - - /* There's no need to call protect_from_queue, because - either emit_move_insn or emit_push_insn will do that. */ - - /* Make sure it is a reasonable operand for a move or push insn. */ - if (GET_CODE (val) != REG && GET_CODE (val) != MEM - && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) - val = force_operand (val, NULL_RTX); - -#ifdef FUNCTION_ARG_PASS_BY_REFERENCE - if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) - { - /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can - be viewed as just an efficiency improvement. */ - rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); - emit_move_insn (slot, val); - val = XEXP (slot, 0); - mode = Pmode; - } -#endif - - argvec[count].value = val; - argvec[count].mode = mode; - - argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); - if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) - abort (); -#ifdef FUNCTION_ARG_PARTIAL_NREGS - argvec[count].partial - = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); -#else - argvec[count].partial = 0; -#endif - - locate_and_pad_parm (mode, NULL_TREE, - argvec[count].reg && argvec[count].partial == 0, - NULL_TREE, &args_size, &argvec[count].offset, - &argvec[count].size); - - if (argvec[count].size.var) - abort (); - -#ifndef REG_PARM_STACK_SPACE - if (argvec[count].partial) - argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; -#endif - - if (argvec[count].reg == 0 || argvec[count].partial != 0 -#ifdef REG_PARM_STACK_SPACE - || 1 -#endif - ) - args_size.constant += argvec[count].size.constant; - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* If this arg is actually passed on the stack, it might be - clobbering something we already put there (this library call might - be inside the evaluation of an argument to a function whose call - requires the stack). This will only occur when the library call - has sufficient args to run out of argument registers. Abort in - this case; if this ever occurs, code must be added to save and - restore the arg slot. */ - - if (argvec[count].reg == 0 || argvec[count].partial != 0) - abort (); -#endif - - FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); - } - va_end (p); - - /* If this machine requires an external definition for library - functions, write one out. */ - assemble_external_libcall (fun); - - original_args_size = args_size; -#ifdef STACK_BOUNDARY - args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) - / STACK_BYTES) * STACK_BYTES); -#endif - -#ifdef REG_PARM_STACK_SPACE - args_size.constant = MAX (args_size.constant, - REG_PARM_STACK_SPACE (NULL_TREE)); -#ifndef OUTGOING_REG_PARM_STACK_SPACE - args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); -#endif -#endif - - if (args_size.constant > current_function_outgoing_args_size) - current_function_outgoing_args_size = args_size.constant; - -#ifdef ACCUMULATE_OUTGOING_ARGS - args_size.constant = 0; -#endif - -#ifndef PUSH_ROUNDING - argblock = push_block (GEN_INT (args_size.constant), 0, 0); -#endif - -#ifdef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we push args individually in reverse order, perform stack alignment - before the first push (the last arg). */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - -#ifdef PUSH_ARGS_REVERSED - inc = -1; - argnum = nargs - 1; -#else - inc = 1; - argnum = 0; -#endif - - /* Push the args that need to be pushed. */ - - for (count = 0; count < nargs; count++, argnum += inc) - { - register enum machine_mode mode = argvec[argnum].mode; - register rtx val = argvec[argnum].value; - rtx reg = argvec[argnum].reg; - int partial = argvec[argnum].partial; - - if (! (reg != 0 && partial == 0)) - emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, - argblock, GEN_INT (argvec[count].offset.constant)); - NO_DEFER_POP; - } - -#ifndef PUSH_ARGS_REVERSED -#ifdef STACK_BOUNDARY - /* If we pushed args in forward order, perform stack alignment - after pushing the last arg. */ - if (argblock == 0) - anti_adjust_stack (GEN_INT (args_size.constant - - original_args_size.constant)); -#endif -#endif - -#ifdef PUSH_ARGS_REVERSED - argnum = nargs - 1; -#else - argnum = 0; -#endif - - fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0); - - /* Now load any reg parms into their regs. */ - - for (count = 0; count < nargs; count++, argnum += inc) - { - register enum machine_mode mode = argvec[argnum].mode; - register rtx val = argvec[argnum].value; - rtx reg = argvec[argnum].reg; - int partial = argvec[argnum].partial; - - if (reg != 0 && partial == 0) - emit_move_insn (reg, val); - NO_DEFER_POP; - } - -#if 0 - /* For version 1.37, try deleting this entirely. */ - if (! no_queue) - emit_queue (); -#endif - - /* Any regs containing parms remain in use through the call. */ - for (count = 0; count < nargs; count++) - if (argvec[count].reg != 0) - use_reg (&call_fusage, argvec[count].reg); - - /* Pass the function the address in which to return a structure value. */ - if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) - { - emit_move_insn (struct_value_rtx, - force_reg (Pmode, - force_operand (XEXP (mem_value, 0), - NULL_RTX))); - if (GET_CODE (struct_value_rtx) == REG) - use_reg (&call_fusage, struct_value_rtx); - } - - /* Don't allow popping to be deferred, since then - cse'ing of library calls could delete a call and leave the pop. */ - NO_DEFER_POP; - - /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which - will set inhibit_defer_pop to that value. */ - - emit_call_1 (fun, - get_identifier (XSTR (orgfun, 0)), - get_identifier (XSTR (orgfun, 0)), args_size.constant, - struct_value_size, - FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), - (outmode != VOIDmode && mem_value == 0 - ? hard_libcall_value (outmode) : NULL_RTX), - old_inhibit_defer_pop + 1, call_fusage, is_const); - - /* Now restore inhibit_defer_pop to its actual original value. */ - OK_DEFER_POP; - - pop_temp_slots (); - - /* Copy the value to the right place. */ - if (outmode != VOIDmode) - { - if (mem_value) - { - if (value == 0) - value = mem_value; - if (value != mem_value) - emit_move_insn (value, mem_value); - } - else if (value != 0) - emit_move_insn (value, hard_libcall_value (outmode)); - else - value = hard_libcall_value (outmode); - } - - return value; -} - -#if 0 -/* Return an rtx which represents a suitable home on the stack - given TYPE, the type of the argument looking for a home. - This is called only for BLKmode arguments. - - SIZE is the size needed for this target. - ARGS_ADDR is the address of the bottom of the argument block for this call. - OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless - if this machine uses push insns. */ - -static rtx -target_for_arg (type, size, args_addr, offset) - tree type; - rtx size; - rtx args_addr; - struct args_size offset; -{ - rtx target; - rtx offset_rtx = ARGS_SIZE_RTX (offset); - - /* We do not call memory_address if possible, - because we want to address as close to the stack - as possible. For non-variable sized arguments, - this will be stack-pointer relative addressing. */ - if (GET_CODE (offset_rtx) == CONST_INT) - target = plus_constant (args_addr, INTVAL (offset_rtx)); - else - { - /* I have no idea how to guarantee that this - will work in the presence of register parameters. */ - target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx); - target = memory_address (QImode, target); - } - - return gen_rtx (MEM, BLKmode, target); -} -#endif - -/* Store a single argument for a function call - into the register or memory area where it must be passed. - *ARG describes the argument value and where to pass it. - - ARGBLOCK is the address of the stack-block for all the arguments, - or 0 on a machine where arguments are pushed individually. - - MAY_BE_ALLOCA nonzero says this could be a call to `alloca' - so must be careful about how the stack is used. - - VARIABLE_SIZE nonzero says that this was a variable-sized outgoing - argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate - that we need not worry about saving and restoring the stack. - - FNDECL is the declaration of the function we are calling. */ - -static void -store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl, - reg_parm_stack_space) - struct arg_data *arg; - rtx argblock; - int may_be_alloca; - int variable_size; - tree fndecl; - int reg_parm_stack_space; -{ - register tree pval = arg->tree_value; - rtx reg = 0; - int partial = 0; - int used = 0; - int i, lower_bound, upper_bound; - - if (TREE_CODE (pval) == ERROR_MARK) - return; - - /* Push a new temporary level for any temporaries we make for - this argument. */ - push_temp_slots (); - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* If this is being stored into a pre-allocated, fixed-size, stack area, - save any previous data at that location. */ - if (argblock && ! variable_size && arg->stack) - { -#ifdef ARGS_GROW_DOWNWARD - /* stack_slot is negative, but we want to index stack_usage_map */ - /* with positive values. */ - if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) - upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; - else - abort (); - - lower_bound = upper_bound - arg->size.constant; -#else - if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) - lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); - else - lower_bound = 0; - - upper_bound = lower_bound + arg->size.constant; -#endif - - for (i = lower_bound; i < upper_bound; i++) - if (stack_usage_map[i] -#ifdef REG_PARM_STACK_SPACE - /* Don't store things in the fixed argument area at this point; - it has already been saved. */ - && i > reg_parm_stack_space -#endif - ) - break; - - if (i != upper_bound) - { - /* We need to make a save area. See what mode we can make it. */ - enum machine_mode save_mode - = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); - rtx stack_area - = gen_rtx (MEM, save_mode, - memory_address (save_mode, XEXP (arg->stack_slot, 0))); - - if (save_mode == BLKmode) - { - arg->save_area = assign_stack_temp (BLKmode, - arg->size.constant, 0); - MEM_IN_STRUCT_P (arg->save_area) - = AGGREGATE_TYPE_P (TREE_TYPE (arg->tree_value)); - preserve_temp_slots (arg->save_area); - emit_block_move (validize_mem (arg->save_area), stack_area, - GEN_INT (arg->size.constant), - PARM_BOUNDARY / BITS_PER_UNIT); - } - else - { - arg->save_area = gen_reg_rtx (save_mode); - emit_move_insn (arg->save_area, stack_area); - } - } - } -#endif - - /* If this isn't going to be placed on both the stack and in registers, - set up the register and number of words. */ - if (! arg->pass_on_stack) - reg = arg->reg, partial = arg->partial; - - if (reg != 0 && partial == 0) - /* Being passed entirely in a register. We shouldn't be called in - this case. */ - abort (); - - /* If this arg needs special alignment, don't load the registers - here. */ - if (arg->n_aligned_regs != 0) - reg = 0; - - /* If this is being partially passed in a register, but multiple locations - are specified, we assume that the one partially used is the one that is - listed first. */ - if (reg && GET_CODE (reg) == EXPR_LIST) - reg = XEXP (reg, 0); - - /* If this is being passed partially in a register, we can't evaluate - it directly into its stack slot. Otherwise, we can. */ - if (arg->value == 0) - { -#ifdef ACCUMULATE_OUTGOING_ARGS - /* stack_arg_under_construction is nonzero if a function argument is - being evaluated directly into the outgoing argument list and - expand_call must take special action to preserve the argument list - if it is called recursively. - - For scalar function arguments stack_usage_map is sufficient to - determine which stack slots must be saved and restored. Scalar - arguments in general have pass_on_stack == 0. - - If this argument is initialized by a function which takes the - address of the argument (a C++ constructor or a C function - returning a BLKmode structure), then stack_usage_map is - insufficient and expand_call must push the stack around the - function call. Such arguments have pass_on_stack == 1. - - Note that it is always safe to set stack_arg_under_construction, - but this generates suboptimal code if set when not needed. */ - - if (arg->pass_on_stack) - stack_arg_under_construction++; -#endif - arg->value = expand_expr (pval, - (partial - || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) - ? NULL_RTX : arg->stack, - VOIDmode, 0); - - /* If we are promoting object (or for any other reason) the mode - doesn't agree, convert the mode. */ - - if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) - arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), - arg->value, arg->unsignedp); - -#ifdef ACCUMULATE_OUTGOING_ARGS - if (arg->pass_on_stack) - stack_arg_under_construction--; -#endif - } - - /* Don't allow anything left on stack from computation - of argument to alloca. */ - if (may_be_alloca) - do_pending_stack_adjust (); - - if (arg->value == arg->stack) - /* If the value is already in the stack slot, we are done. */ - ; - else if (arg->mode != BLKmode) - { - register int size; - - /* Argument is a scalar, not entirely passed in registers. - (If part is passed in registers, arg->partial says how much - and emit_push_insn will take care of putting it there.) - - Push it, and if its size is less than the - amount of space allocated to it, - also bump stack pointer by the additional space. - Note that in C the default argument promotions - will prevent such mismatches. */ - - size = GET_MODE_SIZE (arg->mode); - /* Compute how much space the push instruction will push. - On many machines, pushing a byte will advance the stack - pointer by a halfword. */ -#ifdef PUSH_ROUNDING - size = PUSH_ROUNDING (size); -#endif - used = size; - - /* Compute how much space the argument should get: - round up to a multiple of the alignment for arguments. */ - if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) - used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) - / (PARM_BOUNDARY / BITS_PER_UNIT)) - * (PARM_BOUNDARY / BITS_PER_UNIT)); - - /* This isn't already where we want it on the stack, so put it there. - This can either be done with push or copy insns. */ - emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, - 0, partial, reg, used - size, - argblock, ARGS_SIZE_RTX (arg->offset)); - } - else - { - /* BLKmode, at least partly to be pushed. */ - - register int excess; - rtx size_rtx; - - /* Pushing a nonscalar. - If part is passed in registers, PARTIAL says how much - and emit_push_insn will take care of putting it there. */ - - /* Round its size up to a multiple - of the allocation unit for arguments. */ - - if (arg->size.var != 0) - { - excess = 0; - size_rtx = ARGS_SIZE_RTX (arg->size); - } - else - { - /* PUSH_ROUNDING has no effect on us, because - emit_push_insn for BLKmode is careful to avoid it. */ - excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) - + partial * UNITS_PER_WORD); - size_rtx = expr_size (pval); - } - - emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, - TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial, - reg, excess, argblock, ARGS_SIZE_RTX (arg->offset)); - } - - - /* Unless this is a partially-in-register argument, the argument is now - in the stack. - - ??? Note that this can change arg->value from arg->stack to - arg->stack_slot and it matters when they are not the same. - It isn't totally clear that this is correct in all cases. */ - if (partial == 0) - arg->value = arg->stack_slot; - - /* Once we have pushed something, pops can't safely - be deferred during the rest of the arguments. */ - NO_DEFER_POP; - - /* ANSI doesn't require a sequence point here, - but PCC has one, so this will avoid some problems. */ - emit_queue (); - - /* Free any temporary slots made in processing this argument. Show - that we might have taken the address of something and pushed that - as an operand. */ - preserve_temp_slots (NULL_RTX); - free_temp_slots (); - pop_temp_slots (); - -#ifdef ACCUMULATE_OUTGOING_ARGS - /* Now mark the segment we just used. */ - if (argblock && ! variable_size && arg->stack) - for (i = lower_bound; i < upper_bound; i++) - stack_usage_map[i] = 1; -#endif -} |