1992-01-17 23:48:42 +01:00
|
|
|
|
/* Convert function calls to rtl insns, for GNU C compiler.
|
|
|
|
|
Copyright (C) 1989, 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
|
|
|
|
|
|
#include "config.h"
|
|
|
|
|
#include "rtl.h"
|
|
|
|
|
#include "tree.h"
|
|
|
|
|
#include "flags.h"
|
|
|
|
|
#include "expr.h"
|
|
|
|
|
#include "insn-flags.h"
|
|
|
|
|
|
|
|
|
|
/* Decide whether a function's arguments should be processed
|
|
|
|
|
from first to last or from last to first. */
|
|
|
|
|
|
|
|
|
|
#ifdef STACK_GROWS_DOWNWARD
|
|
|
|
|
#ifdef PUSH_ROUNDING
|
|
|
|
|
#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;
|
|
|
|
|
/* 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;
|
|
|
|
|
/* 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. */
|
|
|
|
|
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
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#ifdef ACCUMULATE_OUTGOING_ARGS
|
|
|
|
|
/* A vector of one char per word 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;
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
static void store_one_arg ();
|
|
|
|
|
extern enum machine_mode mode_for_size ();
|
|
|
|
|
|
|
|
|
|
/* Return 1 if EXP contains a call to the built-in function `alloca'. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
calls_alloca (exp)
|
|
|
|
|
tree exp;
|
|
|
|
|
{
|
|
|
|
|
register int i;
|
|
|
|
|
int type = TREE_CODE_CLASS (TREE_CODE (exp));
|
|
|
|
|
int length = tree_code_length[(int) TREE_CODE (exp)];
|
|
|
|
|
|
|
|
|
|
/* Only expressions and references can contain calls. */
|
|
|
|
|
|
|
|
|
|
if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r')
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
switch (TREE_CODE (exp))
|
|
|
|
|
{
|
|
|
|
|
case CALL_EXPR:
|
|
|
|
|
if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
|
|
|
|
|
&& (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
|
|
|
|
|
== FUNCTION_DECL)
|
|
|
|
|
&& DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
|
|
|
|
|
&& (DECL_FUNCTION_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
|
|
|
|
|
== BUILT_IN_ALLOCA))
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
/* Third operand is RTL. */
|
|
|
|
|
length = 2;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case SAVE_EXPR:
|
|
|
|
|
if (SAVE_EXPR_RTL (exp) != 0)
|
|
|
|
|
return 0;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case BLOCK:
|
|
|
|
|
/* Must not look at BLOCK_SUPERCONTEXT since it will point back to
|
|
|
|
|
us. */
|
|
|
|
|
length = 3;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
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_alloca (TREE_OPERAND (exp, i)))
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
USE_INSNS points to a variable holding a chain of USE insns
|
|
|
|
|
to which a USE of the static chain
|
|
|
|
|
register should be added, if required. */
|
|
|
|
|
|
|
|
|
|
rtx
|
|
|
|
|
prepare_call_address (funexp, fndecl, use_insns)
|
|
|
|
|
rtx funexp;
|
|
|
|
|
tree fndecl;
|
|
|
|
|
rtx *use_insns;
|
|
|
|
|
{
|
|
|
|
|
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 = 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);
|
|
|
|
|
|
|
|
|
|
/* Put the USE insn in the chain we were passed. It will later be
|
|
|
|
|
output immediately in front of the CALL insn. */
|
|
|
|
|
push_to_sequence (*use_insns);
|
|
|
|
|
emit_insn (gen_rtx (USE, VOIDmode, static_chain_rtx));
|
|
|
|
|
*use_insns = get_insns ();
|
|
|
|
|
end_sequence ();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return funexp;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Generate instructions to call function FUNEXP,
|
|
|
|
|
and optionally pop the results.
|
|
|
|
|
The CALL_INSN is the first insn generated.
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
USE_INSNS is a chain of USE insns to be emitted immediately before
|
|
|
|
|
the actual CALL insn.
|
|
|
|
|
|
|
|
|
|
IS_CONST is true if this is a `const' call. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
emit_call_1 (funexp, funtype, stack_size, struct_value_size, next_arg_reg,
|
|
|
|
|
valreg, old_inhibit_defer_pop, use_insns, is_const)
|
|
|
|
|
rtx funexp;
|
|
|
|
|
tree funtype;
|
|
|
|
|
int stack_size;
|
|
|
|
|
int struct_value_size;
|
|
|
|
|
rtx next_arg_reg;
|
|
|
|
|
rtx valreg;
|
|
|
|
|
int old_inhibit_defer_pop;
|
|
|
|
|
rtx use_insns;
|
|
|
|
|
int is_const;
|
|
|
|
|
{
|
|
|
|
|
rtx stack_size_rtx = gen_rtx (CONST_INT, VOIDmode, stack_size);
|
|
|
|
|
rtx struct_value_size_rtx = gen_rtx (CONST_INT, VOIDmode, 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 (funtype, stack_size) > 0 || stack_size == 0))
|
|
|
|
|
{
|
|
|
|
|
rtx n_pop = gen_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
RETURN_POPS_ARGS (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));
|
|
|
|
|
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 and write the USE insns before it. */
|
|
|
|
|
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 USE insns before the CALL. */
|
|
|
|
|
emit_insns_before (use_insns, call_insn);
|
|
|
|
|
|
|
|
|
|
/* If this is a const call, then set the insn's unchanging bit. */
|
|
|
|
|
if (is_const)
|
|
|
|
|
CONST_CALL_P (call_insn) = 1;
|
|
|
|
|
|
|
|
|
|
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 (funtype, stack_size) > 0)
|
|
|
|
|
{
|
|
|
|
|
if (!already_popped)
|
|
|
|
|
emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx));
|
|
|
|
|
stack_size -= RETURN_POPS_ARGS (funtype, stack_size);
|
|
|
|
|
stack_size_rtx = gen_rtx (CONST_INT, VOIDmode, stack_size);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (stack_size != 0)
|
|
|
|
|
{
|
|
|
|
|
if (flag_defer_pop && inhibit_defer_pop == 0)
|
|
|
|
|
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, modifier)
|
|
|
|
|
tree exp;
|
|
|
|
|
rtx target;
|
|
|
|
|
int ignore;
|
|
|
|
|
enum expand_modifier modifier;
|
|
|
|
|
{
|
|
|
|
|
/* 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 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
|
|
|
|
|
|
|
|
|
|
/* 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;
|
|
|
|
|
int old_inhibit_defer_pop = inhibit_defer_pop;
|
|
|
|
|
tree old_cleanups = cleanups_this_call;
|
|
|
|
|
|
|
|
|
|
rtx use_insns = 0;
|
|
|
|
|
|
|
|
|
|
register tree p;
|
|
|
|
|
register int i;
|
|
|
|
|
|
|
|
|
|
/* 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)
|
|
|
|
|
{
|
|
|
|
|
/* May still be a `const' function if it is
|
|
|
|
|
a call through a pointer-to-const.
|
|
|
|
|
But we don't handle that. */
|
|
|
|
|
fndecl = 0;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
if (!flag_no_inline
|
|
|
|
|
&& fndecl != current_function_decl
|
|
|
|
|
&& DECL_SAVED_INSNS (fndecl))
|
|
|
|
|
is_integrable = 1;
|
|
|
|
|
else if (! TREE_ADDRESSABLE (fndecl))
|
|
|
|
|
{
|
|
|
|
|
/* In case this function later becomes inlineable,
|
|
|
|
|
record that there was already a non-inline call to it.
|
|
|
|
|
|
|
|
|
|
Use abstraction instead of setting TREE_ADDRESSABLE
|
|
|
|
|
directly. */
|
|
|
|
|
if (TREE_INLINE (fndecl) && extra_warnings && !flag_no_inline)
|
|
|
|
|
warning_with_decl (fndecl, "can't inline call to `%s' which was declared inline");
|
|
|
|
|
mark_addressable (fndecl);
|
|
|
|
|
}
|
|
|
|
|
|
1992-03-14 06:07:15 +01:00
|
|
|
|
if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl)
|
|
|
|
|
&& TYPE_MODE (TREE_TYPE (exp)) != VOIDmode)
|
1992-01-17 23:48:42 +01:00
|
|
|
|
is_const = 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
is_volatile = TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (p)));
|
|
|
|
|
|
|
|
|
|
/* Warn if this value is an aggregate type,
|
|
|
|
|
regardless of which calling convention we are using for it. */
|
|
|
|
|
if (warn_aggregate_return
|
|
|
|
|
&& (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
|
|
|
|
|
|| TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE
|
|
|
|
|
|| TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE))
|
|
|
|
|
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
|
|
|
|
|
if (flag_pcc_struct_return)
|
|
|
|
|
{
|
|
|
|
|
pcc_struct_value = 1;
|
|
|
|
|
is_integrable = 0; /* Easier than making that case work right. */
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
#endif
|
|
|
|
|
{
|
|
|
|
|
struct_value_size = int_size_in_bytes (TREE_TYPE (exp));
|
|
|
|
|
|
|
|
|
|
if (struct_value_size < 0)
|
|
|
|
|
abort ();
|
|
|
|
|
|
|
|
|
|
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. */
|
|
|
|
|
|
|
|
|
|
structure_value_addr
|
|
|
|
|
= XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0);
|
|
|
|
|
target = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If called function is inline, try to integrate it. */
|
|
|
|
|
|
|
|
|
|
if (is_integrable)
|
|
|
|
|
{
|
|
|
|
|
rtx temp;
|
|
|
|
|
|
|
|
|
|
temp = expand_inline_function (fndecl, actparms, target,
|
|
|
|
|
ignore, TREE_TYPE (exp),
|
|
|
|
|
structure_value_addr);
|
|
|
|
|
|
|
|
|
|
/* If inlining succeeded, return. */
|
|
|
|
|
if ((int) temp != -1)
|
|
|
|
|
{
|
|
|
|
|
/* 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);
|
|
|
|
|
|
|
|
|
|
/* 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. */
|
|
|
|
|
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));
|
|
|
|
|
|
|
|
|
|
#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;
|
|
|
|
|
|
|
|
|
|
if (name[0] == '_')
|
|
|
|
|
tname += ((name[1] == '_' && name[2] == 'x') ? 3 : 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 temporaries used
|
|
|
|
|
by each of the arguments separately. */
|
|
|
|
|
push_temp_slots ();
|
|
|
|
|
|
|
|
|
|
/* Start updating where the next arg would go. */
|
|
|
|
|
INIT_CUMULATIVE_ARGS (args_so_far, funtype, 0);
|
|
|
|
|
|
|
|
|
|
/* 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)
|
|
|
|
|
{
|
|
|
|
|
actparms
|
|
|
|
|
= tree_cons (error_mark_node,
|
|
|
|
|
make_tree (build_pointer_type (TREE_TYPE (funtype)),
|
|
|
|
|
force_reg (Pmode, structure_value_addr)),
|
|
|
|
|
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.
|
|
|
|
|
(If no anonymous args follow, the result of list_length
|
|
|
|
|
is actually one too large.)
|
|
|
|
|
|
|
|
|
|
If SETUP_INCOMING_VARARGS is defined, 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
|
1992-03-14 06:07:15 +01:00
|
|
|
|
argument list to be independent of the function declaration.
|
1992-01-17 23:48:42 +01:00
|
|
|
|
|
|
|
|
|
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. */
|
|
|
|
|
#ifndef SETUP_INCOMING_VARARGS
|
|
|
|
|
if (TYPE_ARG_TYPES (funtype) != 0)
|
|
|
|
|
n_named_args
|
|
|
|
|
= list_length (TYPE_ARG_TYPES (funtype)) - 1
|
|
|
|
|
/* 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 (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 of 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));
|
|
|
|
|
|
|
|
|
|
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;
|
|
|
|
|
|
|
|
|
|
/* 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. */
|
|
|
|
|
|
|
|
|
|
#ifdef FUNCTION_ARG_PASS_BY_REFERENCE
|
|
|
|
|
/* See if this argument should be passed by invisible reference. */
|
|
|
|
|
if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), type,
|
|
|
|
|
argpos < n_named_args))
|
|
|
|
|
{
|
|
|
|
|
/* We make a copy of the object and pass the address to the function
|
|
|
|
|
being called. */
|
|
|
|
|
int size = int_size_in_bytes (type);
|
|
|
|
|
rtx copy;
|
|
|
|
|
|
|
|
|
|
if (size < 0)
|
|
|
|
|
{
|
|
|
|
|
/* This is a variable-sized object. Make space on the stack
|
|
|
|
|
for it. */
|
|
|
|
|
rtx size_rtx = expand_expr (size_in_bytes (type), 0,
|
|
|
|
|
VOIDmode, 0);
|
|
|
|
|
|
|
|
|
|
if (old_stack_level == 0)
|
|
|
|
|
{
|
|
|
|
|
old_stack_level = copy_to_mode_reg (Pmode, stack_pointer_rtx);
|
|
|
|
|
old_pending_adj = pending_stack_adjust;
|
|
|
|
|
pending_stack_adjust = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
copy = gen_rtx (MEM, BLKmode,
|
1992-04-03 08:50:46 +02:00
|
|
|
|
allocate_dynamic_stack_space (size_rtx, 0,
|
|
|
|
|
TYPE_ALIGN (type)));
|
1992-01-17 23:48:42 +01:00
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
copy = assign_stack_temp (TYPE_MODE (type), size, 1);
|
|
|
|
|
|
|
|
|
|
store_expr (args[i].tree_value, copy, 0);
|
|
|
|
|
|
|
|
|
|
args[i].tree_value = build1 (ADDR_EXPR, build_pointer_type (type),
|
|
|
|
|
make_tree (type, copy));
|
|
|
|
|
type = build_pointer_type (type);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
args[i].reg = FUNCTION_ARG (args_so_far, TYPE_MODE (type), type,
|
|
|
|
|
argpos < n_named_args);
|
|
|
|
|
#ifdef FUNCTION_ARG_PARTIAL_NREGS
|
|
|
|
|
if (args[i].reg)
|
|
|
|
|
args[i].partial
|
|
|
|
|
= FUNCTION_ARG_PARTIAL_NREGS (args_so_far, TYPE_MODE (type), type,
|
|
|
|
|
argpos < n_named_args);
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
args[i].pass_on_stack = MUST_PASS_IN_STACK (TYPE_MODE (type), 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 (fndecl) > 0
|
|
|
|
|
#endif
|
|
|
|
|
|| args[i].pass_on_stack)
|
|
|
|
|
locate_and_pad_parm (TYPE_MODE (type), 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);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 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 (fndecl) > 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 (fndecl)));
|
|
|
|
|
#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 (fndecl));
|
|
|
|
|
#ifndef OUTGOING_REG_PARM_STACK_SPACE
|
|
|
|
|
args_size.constant -= REG_PARM_STACK_SPACE (fndecl);
|
|
|
|
|
#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 >= args_size.constant / 2)
|
|
|
|
|
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. */
|
|
|
|
|
|
|
|
|
|
for (i = 0; i < num_actuals; i++)
|
|
|
|
|
if (is_const
|
|
|
|
|
|| ((args_size.var != 0 || args_size.constant != 0)
|
|
|
|
|
&& calls_alloca (args[i].tree_value)))
|
|
|
|
|
{
|
|
|
|
|
args[i].initial_value = args[i].value
|
|
|
|
|
= expand_expr (args[i].tree_value, 0, VOIDmode, 0);
|
|
|
|
|
preserve_temp_slots (args[i].value);
|
|
|
|
|
free_temp_slots ();
|
|
|
|
|
|
|
|
|
|
/* ANSI doesn't require a sequence point here,
|
|
|
|
|
but PCC has one, so this will avoid some problems. */
|
|
|
|
|
emit_queue ();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 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)
|
|
|
|
|
{
|
|
|
|
|
old_stack_level = copy_to_mode_reg (Pmode, stack_pointer_rtx);
|
|
|
|
|
old_pending_adj = pending_stack_adjust;
|
|
|
|
|
pending_stack_adjust = 0;
|
|
|
|
|
}
|
|
|
|
|
argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0);
|
|
|
|
|
}
|
|
|
|
|
else if (must_preallocate)
|
|
|
|
|
{
|
|
|
|
|
/* 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;
|
|
|
|
|
|
|
|
|
|
#ifdef ACCUMULATE_OUTGOING_ARGS
|
|
|
|
|
/* Store the maximum argument space used. It will be pushed by the
|
|
|
|
|
prologue.
|
|
|
|
|
|
|
|
|
|
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 (needed > current_function_outgoing_args_size)
|
|
|
|
|
current_function_outgoing_args_size = needed;
|
|
|
|
|
|
|
|
|
|
#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 (fndecl);
|
|
|
|
|
#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;
|
|
|
|
|
/* No need to copy this virtual register; the space we're
|
|
|
|
|
using gets preallocated at the start of the function
|
|
|
|
|
so the stack pointer won't change here. */
|
|
|
|
|
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_rtx (CONST_INT, VOIDmode, 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 */
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 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, TYPE_MODE (TREE_TYPE (args[i].tree_value)), addr);
|
|
|
|
|
|
|
|
|
|
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, TYPE_MODE (TREE_TYPE (args[i].tree_value)), 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_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
(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)
|
|
|
|
|
/* 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. */
|
|
|
|
|
{
|
|
|
|
|
funexp = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
|
|
|
|
|
free_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)
|
|
|
|
|
{
|
|
|
|
|
args[i].value = expand_expr (args[i].tree_value, 0, VOIDmode, 0);
|
|
|
|
|
preserve_temp_slots (args[i].value);
|
|
|
|
|
free_temp_slots ();
|
|
|
|
|
|
|
|
|
|
/* ANSI doesn't require a sequence point here,
|
|
|
|
|
but PCC has one, so this will avoid some problems. */
|
|
|
|
|
emit_queue ();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#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. */
|
|
|
|
|
|
|
|
|
|
for (i = 0; i < REG_PARM_STACK_SPACE (fndecl); i++)
|
|
|
|
|
{
|
|
|
|
|
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,
|
|
|
|
|
plus_constant (argblock,
|
|
|
|
|
low_to_save)));
|
|
|
|
|
if (save_mode == BLKmode)
|
|
|
|
|
{
|
|
|
|
|
save_area = assign_stack_temp (BLKmode, num_to_save, 1);
|
|
|
|
|
emit_block_move (validize_mem (save_area), stack_area,
|
|
|
|
|
gen_rtx (CONST_INT, VOIDmode, 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);
|
|
|
|
|
|
|
|
|
|
/* 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);
|
|
|
|
|
|
|
|
|
|
#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_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
(args_size.constant
|
|
|
|
|
- original_args_size.constant)));
|
|
|
|
|
#endif
|
|
|
|
|
#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, 0)));
|
|
|
|
|
if (GET_CODE (struct_value_rtx) == REG)
|
|
|
|
|
{
|
|
|
|
|
push_to_sequence (use_insns);
|
|
|
|
|
emit_insn (gen_rtx (USE, VOIDmode, struct_value_rtx));
|
|
|
|
|
use_insns = get_insns ();
|
|
|
|
|
end_sequence ();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 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 a list headed by USE_INSNS. */
|
|
|
|
|
|
|
|
|
|
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-zero if must move a word at a time, even if just one
|
|
|
|
|
word (e.g, partial == 1 && mode == DFmode). Set to zero if
|
|
|
|
|
we just use a normal move insn. */
|
|
|
|
|
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)
|
|
|
|
|
: 0));
|
|
|
|
|
|
|
|
|
|
/* 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 == 0)
|
|
|
|
|
emit_move_insn (reg, args[i].value);
|
|
|
|
|
else if (args[i].partial == 0 || args[i].pass_on_stack)
|
|
|
|
|
move_block_to_reg (REGNO (reg),
|
|
|
|
|
validize_mem (args[i].value), nregs,
|
|
|
|
|
TYPE_MODE (TREE_TYPE (args[i].tree_value)));
|
|
|
|
|
|
|
|
|
|
push_to_sequence (use_insns);
|
|
|
|
|
if (nregs == 0)
|
|
|
|
|
emit_insn (gen_rtx (USE, VOIDmode, reg));
|
|
|
|
|
else
|
|
|
|
|
use_regs (REGNO (reg), nregs);
|
|
|
|
|
use_insns = get_insns ();
|
|
|
|
|
end_sequence ();
|
|
|
|
|
|
|
|
|
|
/* 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! */
|
|
|
|
|
|
|
|
|
|
funexp = prepare_call_address (funexp, fndecl, &use_insns);
|
|
|
|
|
|
|
|
|
|
/* Generate the actual call instruction. */
|
|
|
|
|
emit_call_1 (funexp, funtype, args_size.constant, struct_value_size,
|
|
|
|
|
FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
|
|
|
|
|
valreg, old_inhibit_defer_pop, use_insns, 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;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 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));
|
|
|
|
|
}
|
|
|
|
|
else if (pcc_struct_value)
|
|
|
|
|
{
|
|
|
|
|
if (target == 0)
|
|
|
|
|
target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
|
|
|
|
|
copy_to_reg (valreg));
|
|
|
|
|
else 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)))
|
|
|
|
|
/* 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
|
|
|
|
|
target = copy_to_reg (valreg);
|
|
|
|
|
|
|
|
|
|
/* 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, restore saved stack-pointer value. */
|
|
|
|
|
|
|
|
|
|
if (old_stack_level)
|
|
|
|
|
{
|
|
|
|
|
emit_move_insn (stack_pointer_rtx, old_stack_level);
|
|
|
|
|
pending_stack_adjust = old_pending_adj;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#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,
|
|
|
|
|
plus_constant (argblock, low_to_save)));
|
|
|
|
|
|
|
|
|
|
if (save_mode != BLKmode)
|
|
|
|
|
emit_move_insn (stack_area, save_area);
|
|
|
|
|
else
|
|
|
|
|
emit_block_move (stack_area, validize_mem (save_area),
|
|
|
|
|
gen_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
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_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
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. */
|
|
|
|
|
if (may_be_alloca && nonlocal_goto_stack_level != 0)
|
|
|
|
|
emit_move_insn (nonlocal_goto_stack_level, stack_pointer_rtx);
|
|
|
|
|
|
|
|
|
|
pop_temp_slots ();
|
|
|
|
|
|
|
|
|
|
return target;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#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,
|
1992-03-14 06:07:15 +01:00
|
|
|
|
or 0 on a machine where arguments are pushed individually.
|
1992-01-17 23:48:42 +01:00
|
|
|
|
|
|
|
|
|
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)
|
|
|
|
|
struct arg_data *arg;
|
|
|
|
|
rtx argblock;
|
|
|
|
|
int may_be_alloca;
|
|
|
|
|
int variable_size;
|
|
|
|
|
tree fndecl;
|
|
|
|
|
{
|
|
|
|
|
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;
|
|
|
|
|
|
|
|
|
|
#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 (fndecl)
|
|
|
|
|
#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, 1);
|
|
|
|
|
emit_block_move (validize_mem (arg->save_area), stack_area,
|
|
|
|
|
gen_rtx (CONST_INT, VOIDmode,
|
|
|
|
|
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 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 passes partially in a register, we can't evaluate
|
|
|
|
|
it directly into its stack slot. Otherwise, we can. */
|
|
|
|
|
if (arg->value == 0)
|
|
|
|
|
arg->value = expand_expr (pval, partial ? 0 : arg->stack, VOIDmode, 0);
|
|
|
|
|
|
|
|
|
|
/* 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 (TYPE_MODE (TREE_TYPE (pval)) != 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 (TYPE_MODE (TREE_TYPE (pval)));
|
|
|
|
|
/* 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 (TYPE_MODE (TREE_TYPE (pval)),
|
|
|
|
|
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, TYPE_MODE (TREE_TYPE (pval)),
|
|
|
|
|
TREE_TYPE (pval), 0, 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
|
|
|
|
|
{
|
|
|
|
|
register tree size = size_in_bytes (TREE_TYPE (pval));
|
|
|
|
|
/* PUSH_ROUNDING has no effect on us, because
|
|
|
|
|
emit_push_insn for BLKmode is careful to avoid it. */
|
|
|
|
|
excess = (arg->size.constant - TREE_INT_CST_LOW (size)
|
|
|
|
|
+ partial * UNITS_PER_WORD);
|
|
|
|
|
size_rtx = expand_expr (size, 0, VOIDmode, 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
emit_push_insn (arg->value, TYPE_MODE (TREE_TYPE (pval)),
|
|
|
|
|
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. */
|
|
|
|
|
free_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
|
|
|
|
|
}
|