/* Convert function calls to rtl insns, for GNU C compiler.
- Copyright (C) 1989, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1989, 92-97, 1998 Free Software Foundation, Inc.
This file is part of GNU CC.
Boston, MA 02111-1307, USA. */
#include "config.h"
+#include "system.h"
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "expr.h"
-#ifdef __STDC__
-#include <stdarg.h>
-#else
-#include <varargs.h>
-#endif
+#include "regs.h"
#include "insn-flags.h"
+#include "toplev.h"
+#include "output.h"
/* Decide whether a function's arguments should be processed
from first to last or from last to first.
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,
+static void emit_call_1 PROTO((rtx, tree, tree, HOST_WIDE_INT,
+ HOST_WIDE_INT, rtx, rtx,
int, rtx, int));
static void store_one_arg PROTO ((struct arg_data *, rtx, int, int,
- tree, int));
+ int));
\f
/* If WHICH is 1, return 1 if EXP contains a call to the built-in function
`alloca'.
case RTL_EXPR:
return 0;
+
+ default:
+ break;
}
for (i = 0; i < length; i++)
/* 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. */
- (SMALL_REGISTER_CLASSES && reg_parm_seen)
- ? force_not_mem (memory_address (FUNCTION_MODE, funexp))
- :
-#endif
- memory_address (FUNCTION_MODE, funexp);
+ function address into a register now. */
+ funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen)
+ ? force_not_mem (memory_address (FUNCTION_MODE, funexp))
+ : memory_address (FUNCTION_MODE, funexp));
else
{
#ifndef NO_FUNCTION_CSE
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;
+ tree fndecl ATTRIBUTE_UNUSED;
+ tree funtype ATTRIBUTE_UNUSED;
+ HOST_WIDE_INT stack_size;
+ HOST_WIDE_INT struct_value_size;
rtx next_arg_reg;
rtx valreg;
int old_inhibit_defer_pop;
rtx stack_size_rtx = GEN_INT (stack_size);
rtx struct_value_size_rtx = GEN_INT (struct_value_size);
rtx call_insn;
+#ifndef ACCUMULATE_OUTGOING_ARGS
int already_popped = 0;
+#endif
/* 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,
if (valreg)
pat = gen_call_value_pop (valreg,
- gen_rtx (MEM, FUNCTION_MODE, funexp),
+ 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),
+ pat = gen_call_pop (gen_rtx_MEM (FUNCTION_MODE, funexp),
stack_size_rtx, next_arg_reg, n_pop);
emit_call_insn (pat);
{
if (valreg)
emit_call_insn (gen_call_value (valreg,
- gen_rtx (MEM, FUNCTION_MODE, funexp),
+ 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),
+ emit_call_insn (gen_call (gen_rtx_MEM (FUNCTION_MODE, funexp),
stack_size_rtx, next_arg_reg,
struct_value_size_rtx));
}
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));
+ 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);
}
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,
/* 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;
+ HOST_WIDE_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;
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;
/* Nonzero if it is plausible that this is a call to alloca. */
int may_be_alloca;
+ /* Nonzero if this is a call to malloc or a related function. */
+ int is_malloc;
/* Nonzero if this is a call to setjmp or a related function. */
int returns_twice;
/* Nonzero if this is a call to `longjmp'. */
#ifdef ACCUMULATE_OUTGOING_ARGS
int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
char *initial_stack_usage_map = stack_usage_map;
+ int old_stack_arg_under_construction;
#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;
+ /* The value of the function call can be put in a hard register. But
+ if -fcheck-memory-usage, code which invokes functions (and thus
+ damages some hard registers) can be inserted before using the value.
+ So, target is always a pseudo-register in that case. */
+ if (current_function_check_memory_usage)
+ target = 0;
+
/* 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. */
#endif
#endif
+#if defined(PUSH_ROUNDING) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
+ if (reg_parm_stack_space > 0)
+ must_preallocate = 1;
+#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)))
structure_value_addr = XEXP (target, 0);
else
{
- /* Assign a temporary on the stack to hold the value. */
+ /* Assign a temporary to hold the value. */
+ tree d;
/* For variable-sized objects, we must be called with a target
specified. If we were to allocate space on the stack here,
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));
+ /* This DECL is just something to feed to mark_addressable;
+ it doesn't get pushed. */
+ d = build_decl (VAR_DECL, NULL_TREE, TREE_TYPE (exp));
+ DECL_RTL (d) = assign_temp (TREE_TYPE (exp), 1, 0, 1);
+ mark_addressable (d);
+ structure_value_addr = XEXP (DECL_RTL (d), 0);
+ TREE_USED (d) = 1;
target = 0;
}
}
if (is_integrable)
{
rtx temp;
+#ifdef ACCUMULATE_OUTGOING_ARGS
rtx before_call = get_last_insn ();
+#endif
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 (temp != (rtx) (HOST_WIDE_INT) -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
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. */
+ 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
+ Add the stack space reserved for register arguments, if
+ any, 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
+
+ int adjust = (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl))
+ + reg_parm_stack_space);
+
start_sequence ();
emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
allocate_dynamic_stack_space (GEN_INT (adjust),
/* 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);
+ 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
+ may_be_alloca
+ = (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6
&& name[0] == 'a'
&& ! strcmp (name, "alloca"))
|| (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16
returns_twice = 0;
is_longjmp = 0;
+ is_malloc = 0;
- if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15)
+ if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17
+ /* Exclude functions not at the file scope, or not `extern',
+ since they are not the magic functions we would otherwise
+ think they are. */
+ && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl))
{
char *tname = name;
else if (tname[0] == 'l' && tname[1] == 'o'
&& ! strcmp (tname, "longjmp"))
is_longjmp = 1;
+ /* XXX should have "malloc" attribute on functions instead
+ of recognizing them by name. */
+ else if (! strcmp (tname, "malloc")
+ || ! strcmp (tname, "calloc")
+ || ! strcmp (tname, "realloc")
+ /* Note use of NAME rather than TNAME here. These functions
+ are only reserved when preceded with __. */
+ || ! strcmp (name, "__vn") /* mangled __builtin_vec_new */
+ || ! strcmp (name, "__nw") /* mangled __builtin_new */
+ || ! strcmp (name, "__builtin_new")
+ || ! strcmp (name, "__builtin_vec_new"))
+ is_malloc = 1;
}
if (may_be_alloca)
/* 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.
+ We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero.
(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,
+ If SETUP_INCOMING_VARARGS is defined and STRICT_ARGUMENT_NAMING is zero,
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
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)
+
+ if ((STRICT_ARGUMENT_NAMING
+#ifndef SETUP_INCOMING_VARARGS
+ || 1
+#endif
+ )
+ && 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
+ - (STRICT_ARGUMENT_NAMING ? 0 : 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;
#endif
)
{
+ /* If we're compiling a thunk, pass through invisible
+ references instead of making a copy. */
+ if (current_function_is_thunk
#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))
+ || (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))
+#endif
+ )
{
args[i].tree_value = build1 (ADDR_EXPR,
build_pointer_type (type),
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)
+ || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
+ || (flag_stack_check && ! STACK_CHECK_BUILTIN
+ && (TREE_INT_CST_HIGH (TYPE_SIZE (type)) != 0
+ || (TREE_INT_CST_LOW (TYPE_SIZE (type))
+ > STACK_CHECK_MAX_VAR_SIZE * BITS_PER_UNIT))))
{
/* This is a variable-sized object. Make space on the stack
for it. */
pending_stack_adjust = 0;
}
- copy = gen_rtx (MEM, BLKmode,
- allocate_dynamic_stack_space (size_rtx,
- NULL_RTX,
- TYPE_ALIGN (type)));
+ copy = gen_rtx_MEM (BLKmode,
+ allocate_dynamic_stack_space (size_rtx,
+ NULL_RTX,
+ TYPE_ALIGN (type)));
}
else
{
/* 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
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)
+ if (reg_parm_stack_space == 0 && ! 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.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)));
+ size_int (reg_parm_stack_space));
#ifndef OUTGOING_REG_PARM_STACK_SPACE
/* The area corresponding to register parameters is not to count in
size_int (reg_parm_stack_space));
#endif
}
-#endif
}
else
{
/ 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.
/* Now we are about to start emitting insns that can be deleted
if a libcall is deleted. */
- if (is_const)
+ if (is_const || is_malloc)
start_sequence ();
/* If we have no actual push instructions, or shouldn't use them,
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)
+#ifndef 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. */
to initialize an argument. */
if (stack_arg_under_construction)
{
-#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
+#ifndef 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);
if (GET_CODE (offset) == CONST_INT)
addr = plus_constant (arg_reg, INTVAL (offset));
else
- addr = gen_rtx (PLUS, Pmode, arg_reg, offset);
+ addr = gen_rtx_PLUS (Pmode, arg_reg, offset);
addr = plus_constant (addr, arg_offset);
- args[i].stack = gen_rtx (MEM, args[i].mode, addr);
+ 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 = 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);
+ args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr);
}
}
push_temp_slots ();
funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
pop_temp_slots (); /* FUNEXP can't be BLKmode */
+
+ /* Check the function is executable. */
+ if (current_function_check_memory_usage)
+ emit_library_call (chkr_check_exec_libfunc, 1,
+ VOIDmode, 1,
+ funexp, ptr_mode);
emit_queue ();
}
&& GET_CODE (SUBREG_REG (args[i].value)) == REG)))
&& args[i].mode != BLKmode
&& rtx_cost (args[i].value, SET) > 2
-#ifdef SMALL_REGISTER_CLASSES
&& ((SMALL_REGISTER_CLASSES && reg_parm_seen)
- || preserve_subexpressions_p ())
-#else
- && preserve_subexpressions_p ()
-#endif
- )
+ || preserve_subexpressions_p ()))
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.
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)
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
#else
- plus_constant (argblock,
- low_to_save)
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ low_to_save)));
#endif
- ));
if (save_mode == BLKmode)
{
save_area = assign_stack_temp (BLKmode, num_to_save, 0);
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);
+ args_size.var != 0, 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,
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)))
+ < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD)))
{
int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
int big_endian_correction = 0;
{
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;
+ int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD);
+ int bitalign = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
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);
- }
+ /* There is no need to restrict this code to loading items
+ in TYPE_ALIGN sized hunks. The bitfield instructions can
+ load up entire word sized registers efficiently.
+
+ ??? This may not be needed anymore.
+ We use to emit a clobber here but that doesn't let later
+ passes optimize the instructions we emit. By storing 0 into
+ the register later passes know the first AND to zero out the
+ bitfield being set in the register is unnecessary. The store
+ of 0 will be deleted as will at least the first AND. */
+
+ emit_move_insn (reg, const0_rtx);
+
+ bytes -= bitsize / BITS_PER_UNIT;
+ store_bit_field (reg, bitsize, big_endian_correction, word_mode,
+ extract_bit_field (word, bitsize, 0, 1,
+ NULL_RTX, word_mode,
+ word_mode,
+ bitalign / BITS_PER_UNIT,
+ BITS_PER_WORD),
+ bitalign / BITS_PER_UNIT, BITS_PER_WORD);
}
}
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);
+ args_size.var != 0, reg_parm_stack_space);
#ifndef PUSH_ARGS_REVERSED
#ifdef STACK_BOUNDARY
force_reg (Pmode,
force_operand (structure_value_addr,
NULL_RTX)));
+
+ /* Mark the memory for the aggregate as write-only. */
+ if (current_function_check_memory_usage)
+ emit_library_call (chkr_set_right_libfunc, 1,
+ VOIDmode, 3,
+ structure_value_addr, ptr_mode,
+ GEN_INT (struct_value_size), TYPE_MODE (sizetype),
+ GEN_INT (MEMORY_USE_WO),
+ TYPE_MODE (integer_type_node));
+
if (GET_CODE (struct_value_rtx) == REG)
use_reg (&call_fusage, struct_value_rtx);
}
Mark all register-parms as living through the call, putting these USE
insns in the CALL_INSN_FUNCTION_USAGE field. */
+#ifdef LOAD_ARGS_REVERSED
+ for (i = num_actuals - 1; i >= 0; i--)
+#else
for (i = 0; i < num_actuals; i++)
+#endif
{
rtx reg = args[i].reg;
int partial = args[i].partial;
locations. The Irix 6 ABI has examples of this. */
if (GET_CODE (reg) == PARALLEL)
- emit_group_load (reg, args[i].value);
+ {
+ emit_group_load (reg, args[i].value,
+ int_size_in_bytes (TREE_TYPE (args[i].tree_value)),
+ (TYPE_ALIGN (TREE_TYPE (args[i].tree_value))
+ / BITS_PER_UNIT));
+ }
/* If simple case, just do move. If normal partial, store_one_arg
has already loaded the register for us. In all other cases,
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),
+ emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j),
args[i].aligned_regs[j]);
else if (partial == 0 || args[i].pass_on_stack)
rtx temp = gen_reg_rtx (GET_MODE (valreg));
rtx insns;
+ /* Mark the return value as a pointer if needed. */
+ if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
+ {
+ tree pointed_to = TREE_TYPE (TREE_TYPE (exp));
+ mark_reg_pointer (temp, TYPE_ALIGN (pointed_to) / BITS_PER_UNIT);
+ }
+
/* 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);
+ 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);
+ note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note);
#endif
- note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note);
+ note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note);
insns = get_insns ();
end_sequence ();
end_sequence ();
emit_insns (insns);
}
+ else if (is_malloc)
+ {
+ rtx temp = gen_reg_rtx (GET_MODE (valreg));
+ rtx last, insns;
+
+ /* The return value from a malloc-like function is a pointer. */
+ if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
+ mark_reg_pointer (temp, BIGGEST_ALIGNMENT / BITS_PER_UNIT);
+
+ emit_move_insn (temp, valreg);
+
+ /* The return value from a malloc-like function can not alias
+ anything else. */
+ last = get_last_insn ();
+ REG_NOTES (last) =
+ gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last));
+
+ /* Write out the sequence. */
+ insns = get_insns ();
+ end_sequence ();
+ emit_insns (insns);
+ valreg = temp;
+ }
/* For calls to `setjmp', etc., inform flow.c it should complain
if nonvolatile values are live. */
/* 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
+ /* If there are cleanups to be called, don't use a hard reg as target.
+ We need to double check this and see if it matters anymore. */
+ if (any_pending_cleanups (1)
&& target && REG_P (target)
&& REGNO (target) < FIRST_PSEUDO_REGISTER)
target = 0;
{
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));
+ 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);
+ /* This is the special C++ case where we need to
+ know what the true target was. We take care to
+ never use this value more than once in one expression. */
+ target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
+ copy_to_reg (valreg));
+ MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
}
/* Handle calls that return values in multiple non-contiguous locations.
The Irix 6 ABI has examples of this. */
else if (GET_CODE (valreg) == PARALLEL)
{
+ int bytes = int_size_in_bytes (TREE_TYPE (exp));
+
if (target == 0)
{
- int bytes = int_size_in_bytes (TREE_TYPE (exp));
target = assign_stack_temp (TYPE_MODE (TREE_TYPE (exp)), bytes, 0);
MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
preserve_temp_slots (target);
}
- emit_group_store (target, valreg);
+ emit_group_store (target, valreg, bytes,
+ 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))
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 (word_mode, 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);
- }
- }
+ target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp));
else
target = copy_to_reg (valreg);
!= promote_mode (type, TYPE_MODE (type), &unsignedp, 1))
abort ();
- target = gen_rtx (SUBREG, TYPE_MODE (type), target, 0);
+ 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 (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)
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
#else
- plus_constant (argblock, low_to_save)
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ low_to_save)));
#endif
- ));
if (save_mode != BLKmode)
emit_move_insn (stack_area, 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)));
+ = 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);
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 args_size offset; struct args_size size; rtx save_area; };
struct arg *argvec;
int old_inhibit_defer_pop = inhibit_defer_pop;
rtx call_fusage = 0;
+ int reg_parm_stack_space = 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;
+ int needed;
+#endif
+
+#ifdef REG_PARM_STACK_SPACE
+ /* Size of the stack reserved for parameter registers. */
+#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
VA_START (p, nargs);
library functions shouldn't have many args. */
argvec = (struct arg *) alloca (nargs * sizeof (struct arg));
+ bzero ((char *) argvec, nargs * sizeof (struct arg));
+
INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
if (argvec[count].size.var)
abort ();
-#ifndef REG_PARM_STACK_SPACE
- if (argvec[count].partial)
+ if (reg_parm_stack_space == 0 && 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
- )
+ || reg_parm_stack_space > 0)
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);
+#ifdef FINAL_REG_PARM_STACK_SPACE
+ reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
+ args_size.var);
+#endif
+
/* If this machine requires an external definition for library
functions, write one out. */
assemble_external_libcall (fun);
/ STACK_BYTES) * STACK_BYTES);
#endif
-#ifdef REG_PARM_STACK_SPACE
args_size.constant = MAX (args_size.constant,
- REG_PARM_STACK_SPACE (NULL_TREE));
+ reg_parm_stack_space);
+
#ifndef OUTGOING_REG_PARM_STACK_SPACE
- args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE);
-#endif
+ args_size.constant -= reg_parm_stack_space;
#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;
+ /* 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.
+
+ Another approach might be to try to reorder the argument
+ evaluations to avoid this conflicting stack usage. */
+
+ needed = args_size.constant;
+
+#ifndef 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 */
#ifndef PUSH_ROUNDING
argblock = push_block (GEN_INT (args_size.constant), 0, 0);
#endif
+#endif
#ifdef PUSH_ARGS_REVERSED
#ifdef STACK_BOUNDARY
argnum = 0;
#endif
+#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 (count = 0; count < reg_parm_stack_space + 1; count++)
+#else
+ for (count = 0; count < reg_parm_stack_space; count++)
+#endif
+ {
+ if (count >= highest_outgoing_arg_in_use
+ || stack_usage_map[count] == 0)
+ continue;
+
+ if (low_to_save == -1)
+ low_to_save = count;
+
+ high_to_save = count;
+ }
+
+ 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;
+
+#ifdef ARGS_GROW_DOWNWARD
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
+#else
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ 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
+
/* Push the args that need to be pushed. */
+ /* ARGNUM indexes the ARGVEC array in the order in which the arguments
+ are 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;
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ int lower_bound, upper_bound, i;
+#endif
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;
+ {
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ /* If this is being stored into a pre-allocated, fixed-size, stack
+ area, save any previous data at that location. */
+
+#ifdef ARGS_GROW_DOWNWARD
+ /* stack_slot is negative, but we want to index stack_usage_map
+ with positive values. */
+ upper_bound = -argvec[argnum].offset.constant + 1;
+ lower_bound = upper_bound - argvec[argnum].size.constant;
+#else
+ lower_bound = argvec[argnum].offset.constant;
+ upper_bound = lower_bound + argvec[argnum].size.constant;
+#endif
+
+ for (i = lower_bound; i < upper_bound; i++)
+ if (stack_usage_map[i]
+ /* Don't store things in the fixed argument area at this point;
+ it has already been saved. */
+ && i > reg_parm_stack_space)
+ 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 (argvec[argnum].size.constant * BITS_PER_UNIT,
+ MODE_INT, 1);
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock, argvec[argnum].offset.constant)));
+ argvec[argnum].save_area = gen_reg_rtx (save_mode);
+ emit_move_insn (argvec[argnum].save_area, stack_area);
+ }
+#endif
+ emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
+ argblock, GEN_INT (argvec[argnum].offset.constant),
+ reg_parm_stack_space);
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ /* Now mark the segment we just used. */
+ for (i = lower_bound; i < upper_bound; i++)
+ stack_usage_map[i] = 1;
+#endif
+
+ NO_DEFER_POP;
+ }
}
#ifndef PUSH_ARGS_REVERSED
/* Now load any reg parms into their regs. */
+ /* ARGNUM indexes the ARGVEC array in the order in which the arguments
+ are 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;
/* Now restore inhibit_defer_pop to its actual original value. */
OK_DEFER_POP;
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+#ifdef REG_PARM_STACK_SPACE
+ if (save_area)
+ {
+ enum machine_mode save_mode = GET_MODE (save_area);
+#ifdef ARGS_GROW_DOWNWARD
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
+#else
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ 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 (count = 0; count < nargs; count++)
+ if (argvec[count].save_area)
+ {
+ enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock, argvec[count].offset.constant)));
+
+ emit_move_insn (stack_area, argvec[count].save_area);
+ }
+
+ highest_outgoing_arg_in_use = initial_highest_arg_in_use;
+ stack_usage_map = initial_stack_usage_map;
+#endif
}
\f
/* Like emit_library_call except that an extra argument, VALUE,
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 args_size offset; struct args_size size; rtx save_area; };
struct arg *argvec;
int old_inhibit_defer_pop = inhibit_defer_pop;
rtx call_fusage = 0;
int pcc_struct_value = 0;
int struct_value_size = 0;
int is_const;
+ int reg_parm_stack_space = 0;
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ int needed;
+#endif
+
+#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
+ /* Size of the stack reserved for parameter registers. */
+ int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
+ char *initial_stack_usage_map = stack_usage_map;
+#endif
+
+#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
VA_START (p, nargs);
rtx pointer_reg
= hard_function_value (build_pointer_type (type_for_mode (outmode, 0)),
0);
- mem_value = gen_rtx (MEM, outmode, pointer_reg);
+ mem_value = gen_rtx_MEM (outmode, pointer_reg);
pcc_struct_value = 1;
if (value == 0)
value = gen_reg_rtx (outmode);
library functions shouldn't have many args. */
argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg));
+ bzero ((char *) argvec, (nargs + 1) * sizeof (struct arg));
INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
if (argvec[count].reg == 0 || argvec[count].partial != 0
-#ifdef REG_PARM_STACK_SPACE
- || 1
-#endif
- )
+ || reg_parm_stack_space > 0)
args_size.constant += argvec[count].size.constant;
FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1);
if (argvec[count].size.var)
abort ();
-#ifndef REG_PARM_STACK_SPACE
- if (argvec[count].partial)
+ if (reg_parm_stack_space == 0 && 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
- )
+ || reg_parm_stack_space > 0)
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);
+#ifdef FINAL_REG_PARM_STACK_SPACE
+ reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
+ args_size.var);
+#endif
/* If this machine requires an external definition for library
functions, write one out. */
assemble_external_libcall (fun);
/ STACK_BYTES) * STACK_BYTES);
#endif
-#ifdef REG_PARM_STACK_SPACE
args_size.constant = MAX (args_size.constant,
- REG_PARM_STACK_SPACE (NULL_TREE));
+ reg_parm_stack_space);
+
#ifndef OUTGOING_REG_PARM_STACK_SPACE
- args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE);
-#endif
+ args_size.constant -= reg_parm_stack_space;
#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;
+ /* 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.
+
+ Another approach might be to try to reorder the argument
+ evaluations to avoid this conflicting stack usage. */
+
+ needed = args_size.constant;
+
+#ifndef 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 */
#ifndef PUSH_ROUNDING
argblock = push_block (GEN_INT (args_size.constant), 0, 0);
#endif
+#endif
#ifdef PUSH_ARGS_REVERSED
#ifdef STACK_BOUNDARY
argnum = 0;
#endif
+#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 (count = 0; count < reg_parm_stack_space + 1; count++)
+#else
+ for (count = 0; count < reg_parm_stack_space; count++)
+#endif
+ {
+ if (count >= highest_outgoing_arg_in_use
+ || stack_usage_map[count] == 0)
+ continue;
+
+ if (low_to_save == -1)
+ low_to_save = count;
+
+ high_to_save = count;
+ }
+
+ 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;
+
+#ifdef ARGS_GROW_DOWNWARD
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
+#else
+ stack_area = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ 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
+
/* Push the args that need to be pushed. */
+ /* ARGNUM indexes the ARGVEC array in the order in which the arguments
+ are 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;
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ int lower_bound, upper_bound, i;
+#endif
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;
+ {
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ /* If this is being stored into a pre-allocated, fixed-size, stack
+ area, save any previous data at that location. */
+
+#ifdef ARGS_GROW_DOWNWARD
+ /* stack_slot is negative, but we want to index stack_usage_map
+ with positive values. */
+ upper_bound = -argvec[argnum].offset.constant + 1;
+ lower_bound = upper_bound - argvec[argnum].size.constant;
+#else
+ lower_bound = argvec[argnum].offset.constant;
+ upper_bound = lower_bound + argvec[argnum].size.constant;
+#endif
+
+ for (i = lower_bound; i < upper_bound; i++)
+ if (stack_usage_map[i]
+ /* Don't store things in the fixed argument area at this point;
+ it has already been saved. */
+ && i > reg_parm_stack_space)
+ 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 (argvec[argnum].size.constant * BITS_PER_UNIT,
+ MODE_INT, 1);
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ argvec[argnum].offset.constant)));
+ argvec[argnum].save_area = gen_reg_rtx (save_mode);
+ emit_move_insn (argvec[argnum].save_area, stack_area);
+ }
+#endif
+ emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
+ argblock, GEN_INT (argvec[argnum].offset.constant),
+ reg_parm_stack_space);
+
+#ifdef ACCUMULATE_OUTGOING_ARGS
+ /* Now mark the segment we just used. */
+ for (i = lower_bound; i < upper_bound; i++)
+ stack_usage_map[i] = 1;
+#endif
+
+ NO_DEFER_POP;
+ }
}
#ifndef PUSH_ARGS_REVERSED
/* Now load any reg parms into their regs. */
+ /* ARGNUM indexes the ARGVEC array in the order in which the arguments
+ are 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;
build_function_type (type_for_mode (outmode, 0), NULL_TREE),
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),
+ 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. */
value = hard_libcall_value (outmode);
}
+#ifdef ACCUMULATE_OUTGOING_ARGS
+#ifdef REG_PARM_STACK_SPACE
+ if (save_area)
+ {
+ enum machine_mode save_mode = GET_MODE (save_area);
+#ifdef ARGS_GROW_DOWNWARD
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ plus_constant (argblock,
+ - high_to_save)));
+#else
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ 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 (count = 0; count < nargs; count++)
+ if (argvec[count].save_area)
+ {
+ enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
+ rtx stack_area
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode, plus_constant (argblock,
+ argvec[count].offset.constant)));
+
+ emit_move_insn (stack_area, argvec[count].save_area);
+ }
+
+ highest_outgoing_arg_in_use = initial_highest_arg_in_use;
+ stack_usage_map = initial_stack_usage_map;
+#endif
+
return value;
}
\f
{
/* 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 = gen_rtx_PLUS (Pmode, args_addr, offset_rtx);
target = memory_address (QImode, target);
}
- return gen_rtx (MEM, BLKmode, target);
+ return gen_rtx_MEM (BLKmode, target);
}
#endif
\f
FNDECL is the declaration of the function we are calling. */
static void
-store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl,
+store_one_arg (arg, argblock, may_be_alloca, variable_size,
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;
+#ifdef ACCUMULATE_OUTGOING_ARGS
int i, lower_bound, upper_bound;
+#endif
if (TREE_CODE (pval) == ERROR_MARK)
return;
if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1;
else
- abort ();
+ upper_bound = 0;
lower_bound = upper_bound - arg->size.constant;
#else
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
- )
+ && i > reg_parm_stack_space)
break;
if (i != upper_bound)
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)));
+ = gen_rtx_MEM (save_mode,
+ memory_address (save_mode,
+ XEXP (arg->stack_slot, 0)));
if (save_mode == BLKmode)
{
do_pending_stack_adjust ();
if (arg->value == arg->stack)
- /* If the value is already in the stack slot, we are done. */
- ;
+ {
+ /* If the value is already in the stack slot, we are done moving
+ data. */
+ if (current_function_check_memory_usage && GET_CODE (arg->stack) == MEM)
+ {
+ emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
+ XEXP (arg->stack, 0), ptr_mode,
+ ARGS_SIZE_RTX (arg->size),
+ TYPE_MODE (sizetype),
+ GEN_INT (MEMORY_USE_RW),
+ TYPE_MODE (integer_type_node));
+ }
+ }
else if (arg->mode != BLKmode)
{
register int size;
/* 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));
+ emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, 0,
+ partial, reg, used - size, argblock,
+ ARGS_SIZE_RTX (arg->offset), reg_parm_stack_space);
}
else
{
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));
+ reg, excess, argblock, ARGS_SIZE_RTX (arg->offset),
+ reg_parm_stack_space);
}
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