799 lines
31 KiB
C++
799 lines
31 KiB
C++
/* Definitions for code generation pass of GNU compiler.
|
||
Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
|
||
1999, 2000 Free Software Foundation, Inc.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC 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.
|
||
|
||
GCC 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 GCC; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, USA. */
|
||
|
||
/* The default branch cost is 1. */
|
||
#ifndef BRANCH_COST
|
||
#define BRANCH_COST 1
|
||
#endif
|
||
|
||
/* Macros to access the slots of a QUEUED rtx.
|
||
Here rather than in rtl.h because only the expansion pass
|
||
should ever encounter a QUEUED. */
|
||
|
||
/* The variable for which an increment is queued. */
|
||
#define QUEUED_VAR(P) XEXP (P, 0)
|
||
/* If the increment has been emitted, this is the insn
|
||
that does the increment. It is zero before the increment is emitted.
|
||
If more than one insn is emitted, this is the first insn. */
|
||
#define QUEUED_INSN(P) XEXP (P, 1)
|
||
/* If a pre-increment copy has been generated, this is the copy
|
||
(it is a temporary reg). Zero if no copy made yet. */
|
||
#define QUEUED_COPY(P) XEXP (P, 2)
|
||
/* This is the body to use for the insn to do the increment.
|
||
It is used to emit the increment. */
|
||
#define QUEUED_BODY(P) XEXP (P, 3)
|
||
/* Next QUEUED in the queue. */
|
||
#define QUEUED_NEXT(P) XEXP (P, 4)
|
||
|
||
/* This is the 4th arg to `expand_expr'.
|
||
EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
|
||
EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
|
||
EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
|
||
is a constant that is not a legitimate address.
|
||
EXPAND_WRITE means we are only going to write to the resulting rtx. */
|
||
enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM, EXPAND_CONST_ADDRESS,
|
||
EXPAND_INITIALIZER, EXPAND_WRITE};
|
||
|
||
/* Prevent the compiler from deferring stack pops. See
|
||
inhibit_defer_pop for more information. */
|
||
#define NO_DEFER_POP (inhibit_defer_pop += 1)
|
||
|
||
/* Allow the compiler to defer stack pops. See inhibit_defer_pop for
|
||
more information. */
|
||
#define OK_DEFER_POP (inhibit_defer_pop -= 1)
|
||
|
||
#ifdef TREE_CODE /* Don't lose if tree.h not included. */
|
||
/* Structure to record the size of a sequence of arguments
|
||
as the sum of a tree-expression and a constant. This structure is
|
||
also used to store offsets from the stack, which might be negative,
|
||
so the variable part must be ssizetype, not sizetype. */
|
||
|
||
struct args_size
|
||
{
|
||
HOST_WIDE_INT constant;
|
||
tree var;
|
||
};
|
||
#endif
|
||
|
||
/* Add the value of the tree INC to the `struct args_size' TO. */
|
||
|
||
#define ADD_PARM_SIZE(TO, INC) \
|
||
do { \
|
||
tree inc = (INC); \
|
||
if (host_integerp (inc, 0)) \
|
||
(TO).constant += tree_low_cst (inc, 0); \
|
||
else if ((TO).var == 0) \
|
||
(TO).var = convert (ssizetype, inc); \
|
||
else \
|
||
(TO).var = size_binop (PLUS_EXPR, (TO).var, \
|
||
convert (ssizetype, inc)); \
|
||
} while (0)
|
||
|
||
#define SUB_PARM_SIZE(TO, DEC) \
|
||
do { \
|
||
tree dec = (DEC); \
|
||
if (host_integerp (dec, 0)) \
|
||
(TO).constant -= tree_low_cst (dec, 0); \
|
||
else if ((TO).var == 0) \
|
||
(TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
|
||
convert (ssizetype, dec)); \
|
||
else \
|
||
(TO).var = size_binop (MINUS_EXPR, (TO).var, \
|
||
convert (ssizetype, dec)); \
|
||
} while (0)
|
||
|
||
/* Convert the implicit sum in a `struct args_size' into a tree
|
||
of type ssizetype. */
|
||
#define ARGS_SIZE_TREE(SIZE) \
|
||
((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
|
||
: size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
|
||
ssize_int ((SIZE).constant)))
|
||
|
||
/* Convert the implicit sum in a `struct args_size' into an rtx. */
|
||
#define ARGS_SIZE_RTX(SIZE) \
|
||
((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
|
||
: expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
|
||
|
||
/* Supply a default definition for FUNCTION_ARG_PADDING:
|
||
usually pad upward, but pad short args downward on
|
||
big-endian machines. */
|
||
|
||
enum direction {none, upward, downward}; /* Value has this type. */
|
||
|
||
#ifndef FUNCTION_ARG_PADDING
|
||
#define FUNCTION_ARG_PADDING(MODE, TYPE) \
|
||
(! BYTES_BIG_ENDIAN \
|
||
? upward \
|
||
: (((MODE) == BLKmode \
|
||
? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
|
||
&& int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
|
||
: GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
|
||
? downward : upward))
|
||
#endif
|
||
|
||
/* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
|
||
FUNCTION_ARG_PADDING, which also pads the length, handle any needed
|
||
alignment. */
|
||
|
||
#ifndef FUNCTION_ARG_BOUNDARY
|
||
#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
|
||
#endif
|
||
|
||
/* Provide a default value for STRICT_ARGUMENT_NAMING. */
|
||
#ifndef STRICT_ARGUMENT_NAMING
|
||
#define STRICT_ARGUMENT_NAMING 0
|
||
#endif
|
||
|
||
/* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */
|
||
#ifdef SETUP_INCOMING_VARARGS
|
||
#ifndef PRETEND_OUTGOING_VARARGS_NAMED
|
||
#define PRETEND_OUTGOING_VARARGS_NAMED 1
|
||
#endif
|
||
#else
|
||
/* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
|
||
defining SETUP_INCOMING_VARARGS. */
|
||
#define PRETEND_OUTGOING_VARARGS_NAMED 0
|
||
#endif
|
||
|
||
/* Nonzero if we do not know how to pass TYPE solely in registers.
|
||
We cannot do so in the following cases:
|
||
|
||
- if the type has variable size
|
||
- if the type is marked as addressable (it is required to be constructed
|
||
into the stack)
|
||
- if the padding and mode of the type is such that a copy into a register
|
||
would put it into the wrong part of the register.
|
||
|
||
Which padding can't be supported depends on the byte endianness.
|
||
|
||
A value in a register is implicitly padded at the most significant end.
|
||
On a big-endian machine, that is the lower end in memory.
|
||
So a value padded in memory at the upper end can't go in a register.
|
||
For a little-endian machine, the reverse is true. */
|
||
|
||
#ifndef MUST_PASS_IN_STACK
|
||
#define MUST_PASS_IN_STACK(MODE,TYPE) \
|
||
((TYPE) != 0 \
|
||
&& (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
|
||
|| TREE_ADDRESSABLE (TYPE) \
|
||
|| ((MODE) == BLKmode \
|
||
&& ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
|
||
&& 0 == (int_size_in_bytes (TYPE) \
|
||
% (PARM_BOUNDARY / BITS_PER_UNIT))) \
|
||
&& (FUNCTION_ARG_PADDING (MODE, TYPE) \
|
||
== (BYTES_BIG_ENDIAN ? upward : downward)))))
|
||
#endif
|
||
|
||
/* Nonzero if type TYPE should be returned in memory.
|
||
Most machines can use the following default definition. */
|
||
|
||
#ifndef RETURN_IN_MEMORY
|
||
#define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
|
||
#endif
|
||
|
||
/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
|
||
Normally move_insn, so Pmode stack pointer. */
|
||
|
||
#ifndef STACK_SAVEAREA_MODE
|
||
#define STACK_SAVEAREA_MODE(LEVEL) Pmode
|
||
#endif
|
||
|
||
/* Supply a default definition of STACK_SIZE_MODE for
|
||
allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
|
||
|
||
#ifndef STACK_SIZE_MODE
|
||
#define STACK_SIZE_MODE word_mode
|
||
#endif
|
||
|
||
/* Provide default values for the macros controlling stack checking. */
|
||
|
||
#ifndef STACK_CHECK_BUILTIN
|
||
#define STACK_CHECK_BUILTIN 0
|
||
#endif
|
||
|
||
/* The default interval is one page. */
|
||
#ifndef STACK_CHECK_PROBE_INTERVAL
|
||
#define STACK_CHECK_PROBE_INTERVAL 4096
|
||
#endif
|
||
|
||
/* The default is to do a store into the stack. */
|
||
#ifndef STACK_CHECK_PROBE_LOAD
|
||
#define STACK_CHECK_PROBE_LOAD 0
|
||
#endif
|
||
|
||
/* This value is arbitrary, but should be sufficient for most machines. */
|
||
#ifndef STACK_CHECK_PROTECT
|
||
#define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
|
||
#endif
|
||
|
||
/* Make the maximum frame size be the largest we can and still only need
|
||
one probe per function. */
|
||
#ifndef STACK_CHECK_MAX_FRAME_SIZE
|
||
#define STACK_CHECK_MAX_FRAME_SIZE \
|
||
(STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
|
||
#endif
|
||
|
||
/* This is arbitrary, but should be large enough everywhere. */
|
||
#ifndef STACK_CHECK_FIXED_FRAME_SIZE
|
||
#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
|
||
#endif
|
||
|
||
/* Provide a reasonable default for the maximum size of an object to
|
||
allocate in the fixed frame. We may need to be able to make this
|
||
controllable by the user at some point. */
|
||
#ifndef STACK_CHECK_MAX_VAR_SIZE
|
||
#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
|
||
#endif
|
||
|
||
/* Functions from optabs.c, commonly used, and without need for the optabs
|
||
tables: */
|
||
|
||
/* Passed to expand_simple_binop and expand_binop to say which options
|
||
to try to use if the requested operation can't be open-coded on the
|
||
requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
|
||
a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
|
||
using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
|
||
try anything else. */
|
||
|
||
enum optab_methods
|
||
{
|
||
OPTAB_DIRECT,
|
||
OPTAB_LIB,
|
||
OPTAB_WIDEN,
|
||
OPTAB_LIB_WIDEN,
|
||
OPTAB_MUST_WIDEN
|
||
};
|
||
|
||
/* Generate code for a simple binary or unary operation. "Simple" in
|
||
this case means "can be unambiguously described by a (mode, code)
|
||
pair and mapped to a single optab." */
|
||
extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx,
|
||
rtx, rtx, int, enum optab_methods));
|
||
extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code,
|
||
rtx, rtx, int));
|
||
|
||
/* Report whether the machine description contains an insn which can
|
||
perform the operation described by CODE and MODE. */
|
||
extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode));
|
||
|
||
/* Emit code to make a call to a constant function or a library call. */
|
||
extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
|
||
|
||
/* Create but don't emit one rtl instruction to perform certain operations.
|
||
Modes must match; operands must meet the operation's predicates.
|
||
Likewise for subtraction and for just copying.
|
||
These do not call protect_from_queue; caller must do so. */
|
||
extern rtx gen_add2_insn PARAMS ((rtx, rtx));
|
||
extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx));
|
||
extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
|
||
extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx));
|
||
extern rtx gen_move_insn PARAMS ((rtx, rtx));
|
||
extern int have_add2_insn PARAMS ((rtx, rtx));
|
||
extern int have_sub2_insn PARAMS ((rtx, rtx));
|
||
|
||
/* Emit a pair of rtl insns to compare two rtx's and to jump
|
||
to a label if the comparison is true. */
|
||
extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
|
||
enum machine_mode, int, rtx));
|
||
|
||
/* Generate code to indirectly jump to a location given in the rtx LOC. */
|
||
extern void emit_indirect_jump PARAMS ((rtx));
|
||
|
||
#ifdef HAVE_conditional_move
|
||
/* Emit a conditional move operation. */
|
||
rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
|
||
enum machine_mode, rtx, rtx,
|
||
enum machine_mode, int));
|
||
|
||
/* Return non-zero if the conditional move is supported. */
|
||
int can_conditionally_move_p PARAMS ((enum machine_mode mode));
|
||
|
||
#endif
|
||
|
||
|
||
/* Functions from expmed.c: */
|
||
|
||
/* Arguments MODE, RTX: return an rtx for the negation of that value.
|
||
May emit insns. */
|
||
extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
|
||
|
||
/* Expand a logical AND operation. */
|
||
extern rtx expand_and PARAMS ((enum machine_mode, rtx, rtx, rtx));
|
||
|
||
/* Emit a store-flag operation. */
|
||
extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
|
||
enum machine_mode, int, int));
|
||
|
||
/* Like emit_store_flag, but always succeeds. */
|
||
extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
|
||
enum machine_mode, int, int));
|
||
|
||
/* Functions from loop.c: */
|
||
|
||
/* Given an insn and condition, return a canonical description of
|
||
the test being made. */
|
||
extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
|
||
|
||
/* Given a JUMP_INSN, return a canonical description of the test
|
||
being made. */
|
||
extern rtx get_condition PARAMS ((rtx, rtx *));
|
||
|
||
/* Generate a conditional trap instruction. */
|
||
extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
|
||
|
||
/* Functions from builtins.c: */
|
||
extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
|
||
extern void std_expand_builtin_va_start PARAMS ((int, tree, rtx));
|
||
extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
|
||
extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
|
||
extern void default_init_builtins PARAMS ((void));
|
||
extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx,
|
||
enum machine_mode, int));
|
||
extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
|
||
extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
|
||
extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
|
||
extern rtx expand_builtin_saveregs PARAMS ((void));
|
||
extern void expand_builtin_trap PARAMS ((void));
|
||
extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
|
||
extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
|
||
extern void record_base_value PARAMS ((unsigned int, rtx, int));
|
||
extern void record_alias_subset PARAMS ((HOST_WIDE_INT,
|
||
HOST_WIDE_INT));
|
||
extern HOST_WIDE_INT new_alias_set PARAMS ((void));
|
||
extern int can_address_p PARAMS ((tree));
|
||
|
||
/* Functions from expr.c: */
|
||
|
||
/* This is run once per compilation to set up which modes can be used
|
||
directly in memory and to initialize the block move optab. */
|
||
extern void init_expr_once PARAMS ((void));
|
||
|
||
/* This is run at the start of compiling a function. */
|
||
extern void init_expr PARAMS ((void));
|
||
|
||
/* This function is run once to initialize stor-layout.c. */
|
||
|
||
extern void init_stor_layout_once PARAMS ((void));
|
||
|
||
/* This is run at the end of compiling a function. */
|
||
extern void finish_expr_for_function PARAMS ((void));
|
||
|
||
/* Use protect_from_queue to convert a QUEUED expression
|
||
into something that you can put immediately into an instruction. */
|
||
extern rtx protect_from_queue PARAMS ((rtx, int));
|
||
|
||
/* Perform all the pending incrementations. */
|
||
extern void emit_queue PARAMS ((void));
|
||
|
||
/* Tell if something has a queued subexpression. */
|
||
extern int queued_subexp_p PARAMS ((rtx));
|
||
|
||
/* Emit some rtl insns to move data between rtx's, converting machine modes.
|
||
Both modes must be floating or both fixed. */
|
||
extern void convert_move PARAMS ((rtx, rtx, int));
|
||
|
||
/* Convert an rtx to specified machine mode and return the result. */
|
||
extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
|
||
|
||
/* Convert an rtx to MODE from OLDMODE and return the result. */
|
||
extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
|
||
rtx, int));
|
||
|
||
/* Emit code to move a block Y to a block X. */
|
||
extern rtx emit_block_move PARAMS ((rtx, rtx, rtx));
|
||
|
||
/* Copy all or part of a value X into registers starting at REGNO.
|
||
The number of registers to be filled is NREGS. */
|
||
extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
|
||
|
||
/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
|
||
The number of registers to be filled is NREGS. */
|
||
extern void move_block_from_reg PARAMS ((int, rtx, int, int));
|
||
|
||
/* Load a BLKmode value into non-consecutive registers represented by a
|
||
PARALLEL. */
|
||
extern void emit_group_load PARAMS ((rtx, rtx, int));
|
||
|
||
/* Store a BLKmode value from non-consecutive registers represented by a
|
||
PARALLEL. */
|
||
extern void emit_group_store PARAMS ((rtx, rtx, int));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Copy BLKmode object from a set of registers. */
|
||
extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
|
||
#endif
|
||
|
||
/* Mark REG as holding a parameter for the next CALL_INSN. */
|
||
extern void use_reg PARAMS ((rtx *, rtx));
|
||
|
||
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
|
||
for the next CALL_INSN. */
|
||
extern void use_regs PARAMS ((rtx *, int, int));
|
||
|
||
/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
|
||
extern void use_group_regs PARAMS ((rtx *, rtx));
|
||
|
||
/* Write zeros through the storage of OBJECT.
|
||
If OBJECT has BLKmode, SIZE is its length in bytes. */
|
||
extern rtx clear_storage PARAMS ((rtx, rtx));
|
||
|
||
/* Return non-zero if it is desirable to store LEN bytes generated by
|
||
CONSTFUN with several move instructions by store_by_pieces
|
||
function. CONSTFUNDATA is a pointer which will be passed as argument
|
||
in every CONSTFUN call.
|
||
ALIGN is maximum alignment we can assume. */
|
||
extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
|
||
rtx (*) (PTR, HOST_WIDE_INT,
|
||
enum machine_mode),
|
||
PTR, unsigned int));
|
||
|
||
/* Generate several move instructions to store LEN bytes generated by
|
||
CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
|
||
pointer which will be passed as argument in every CONSTFUN call.
|
||
ALIGN is maximum alignment we can assume. */
|
||
extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
|
||
rtx (*) (PTR, HOST_WIDE_INT,
|
||
enum machine_mode),
|
||
PTR, unsigned int));
|
||
|
||
/* Emit insns to set X from Y. */
|
||
extern rtx emit_move_insn PARAMS ((rtx, rtx));
|
||
|
||
/* Emit insns to set X from Y, with no frills. */
|
||
extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
|
||
|
||
/* Push a block of length SIZE (perhaps variable)
|
||
and return an rtx to address the beginning of the block. */
|
||
extern rtx push_block PARAMS ((rtx, int, int));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Generate code to push something onto the stack, given its mode and type. */
|
||
extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
|
||
unsigned int, int, rtx, int, rtx, rtx,
|
||
int, rtx));
|
||
|
||
/* Expand an assignment that stores the value of FROM into TO. */
|
||
extern rtx expand_assignment PARAMS ((tree, tree, int, int));
|
||
|
||
/* Generate code for computing expression EXP,
|
||
and storing the value into TARGET.
|
||
If SUGGEST_REG is nonzero, copy the value through a register
|
||
and return that register, if that is possible. */
|
||
extern rtx store_expr PARAMS ((tree, rtx, int));
|
||
#endif
|
||
|
||
/* Given an rtx that may include add and multiply operations,
|
||
generate them as insns and return a pseudo-reg containing the value.
|
||
Useful after calling expand_expr with 1 as sum_ok. */
|
||
extern rtx force_operand PARAMS ((rtx, rtx));
|
||
|
||
/* Return an object on the placeholder list that matches EXP, a
|
||
PLACEHOLDER_EXPR. An object "matches" if it is of the type of the
|
||
PLACEHOLDER_EXPR or a pointer type to it. For further information, see
|
||
tree.def. If no such object is found, abort. If PLIST is nonzero, it is
|
||
a location which initially points to a starting location in the
|
||
placeholder list (zero means start of the list) and where a pointer into
|
||
the placeholder list at which the object is found is placed. */
|
||
extern tree find_placeholder PARAMS ((tree, tree *));
|
||
|
||
/* Generate code for computing expression EXP.
|
||
An rtx for the computed value is returned. The value is never null.
|
||
In the case of a void EXP, const0_rtx is returned. */
|
||
extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
|
||
enum expand_modifier));
|
||
|
||
/* At the start of a function, record that we have no previously-pushed
|
||
arguments waiting to be popped. */
|
||
extern void init_pending_stack_adjust PARAMS ((void));
|
||
|
||
/* When exiting from function, if safe, clear out any pending stack adjust
|
||
so the adjustment won't get done. */
|
||
extern void clear_pending_stack_adjust PARAMS ((void));
|
||
|
||
/* Pop any previously-pushed arguments that have not been popped yet. */
|
||
extern void do_pending_stack_adjust PARAMS ((void));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Return the tree node and offset if a given argument corresponds to
|
||
a string constant. */
|
||
extern tree string_constant PARAMS ((tree, tree *));
|
||
|
||
/* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
|
||
extern void jumpifnot PARAMS ((tree, rtx));
|
||
|
||
/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
|
||
extern void jumpif PARAMS ((tree, rtx));
|
||
|
||
/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
|
||
the result is zero, or IF_TRUE_LABEL if the result is one. */
|
||
extern void do_jump PARAMS ((tree, rtx, rtx));
|
||
#endif
|
||
|
||
/* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
|
||
extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
|
||
enum machine_mode, rtx));
|
||
extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
|
||
enum machine_mode, rtx,
|
||
rtx, rtx));
|
||
|
||
/* Two different ways of generating switch statements. */
|
||
extern int try_casesi PARAMS ((tree, tree, tree, tree, rtx, rtx));
|
||
extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx));
|
||
|
||
/* Smallest number of adjacent cases before we use a jump table.
|
||
XXX Should be a target hook. */
|
||
extern unsigned int case_values_threshold PARAMS ((void));
|
||
|
||
|
||
#ifdef TREE_CODE
|
||
/* rtl.h and tree.h were included. */
|
||
/* Return an rtx for the size in bytes of the value of an expr. */
|
||
extern rtx expr_size PARAMS ((tree));
|
||
|
||
/* Return a wide integer for the size in bytes of the value of EXP, or -1
|
||
if the size can vary or is larger than an integer. */
|
||
extern HOST_WIDE_INT int_expr_size PARAMS ((tree));
|
||
|
||
extern rtx lookup_static_chain PARAMS ((tree));
|
||
|
||
/* Convert a stack slot address ADDR valid in function FNDECL
|
||
into an address valid in this function (using a static chain). */
|
||
extern rtx fix_lexical_addr PARAMS ((rtx, tree));
|
||
|
||
/* Return the address of the trampoline for entering nested fn FUNCTION. */
|
||
extern rtx trampoline_address PARAMS ((tree));
|
||
|
||
/* Return an rtx that refers to the value returned by a function
|
||
in its original home. This becomes invalid if any more code is emitted. */
|
||
extern rtx hard_function_value PARAMS ((tree, tree, int));
|
||
|
||
extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int));
|
||
|
||
extern rtx expand_call PARAMS ((tree, rtx, int));
|
||
|
||
extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
|
||
rtx, int));
|
||
extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
|
||
rtx, rtx, int));
|
||
extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
|
||
struct args_size *,
|
||
struct args_size *,
|
||
struct args_size *,
|
||
struct args_size *));
|
||
extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
|
||
|
||
/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
|
||
extern rtx label_rtx PARAMS ((tree));
|
||
#endif
|
||
|
||
/* Indicate how an input argument register was promoted. */
|
||
extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
|
||
int *));
|
||
|
||
/* Return an rtx like arg but sans any constant terms.
|
||
Returns the original rtx if it has no constant terms.
|
||
The constant terms are added and stored via a second arg. */
|
||
extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
|
||
|
||
/* Convert arg to a valid memory address for specified machine mode,
|
||
by emitting insns to perform arithmetic if nec. */
|
||
extern rtx memory_address PARAMS ((enum machine_mode, rtx));
|
||
|
||
/* Like `memory_address' but pretent `flag_force_addr' is 0. */
|
||
extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
|
||
|
||
/* Set the alias set of MEM to SET. */
|
||
extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT));
|
||
|
||
/* Set the alignment of MEM to ALIGN bits. */
|
||
extern void set_mem_align PARAMS ((rtx, unsigned int));
|
||
|
||
/* Set the expr for MEM to EXPR. */
|
||
extern void set_mem_expr PARAMS ((rtx, tree));
|
||
|
||
/* Set the offset for MEM to OFFSET. */
|
||
extern void set_mem_offset PARAMS ((rtx, rtx));
|
||
|
||
/* Set the size for MEM to SIZE. */
|
||
extern void set_mem_size PARAMS ((rtx, rtx));
|
||
|
||
/* Return a memory reference like MEMREF, but with its mode changed
|
||
to MODE and its address changed to ADDR.
|
||
(VOIDmode means don't change the mode.
|
||
NULL for ADDR means don't change the address.) */
|
||
extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
|
||
|
||
/* Return a memory reference like MEMREF, but with its mode changed
|
||
to MODE and its address offset by OFFSET bytes. */
|
||
#define adjust_address(MEMREF, MODE, OFFSET) \
|
||
adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
|
||
|
||
/* Likewise, but the reference is not required to be valid. */
|
||
#define adjust_address_nv(MEMREF, MODE, OFFSET) \
|
||
adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
|
||
|
||
/* Return a memory reference like MEMREF, but with its mode changed
|
||
to MODE and its address changed to ADDR, which is assumed to be
|
||
increased by OFFSET bytes from MEMREF. */
|
||
#define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
|
||
adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
|
||
|
||
/* Likewise, but the reference is not required to be valid. */
|
||
#define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
|
||
adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
|
||
|
||
extern rtx adjust_address_1 PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT,
|
||
int, int));
|
||
extern rtx adjust_automodify_address_1 PARAMS ((rtx, enum machine_mode,
|
||
rtx, HOST_WIDE_INT, int));
|
||
|
||
/* Return a memory reference like MEMREF, but whose address is changed by
|
||
adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
|
||
known to be in OFFSET (possibly 1). */
|
||
extern rtx offset_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
|
||
|
||
/* Return a memory reference like MEMREF, but with its address changed to
|
||
ADDR. The caller is asserting that the actual piece of memory pointed
|
||
to is the same, just the form of the address is being changed, such as
|
||
by putting something into a register. */
|
||
extern rtx replace_equiv_address PARAMS ((rtx, rtx));
|
||
|
||
/* Likewise, but the reference is not required to be valid. */
|
||
extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx));
|
||
|
||
/* Return a memory reference like MEMREF, but with its mode widened to
|
||
MODE and adjusted by OFFSET. */
|
||
extern rtx widen_memory_access PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
|
||
|
||
/* Return a memory reference like MEMREF, but which is known to have a
|
||
valid address. */
|
||
extern rtx validize_mem PARAMS ((rtx));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Given REF, either a MEM or a REG, and T, either the type of X or
|
||
the expression corresponding to REF, set RTX_UNCHANGING_P if
|
||
appropriate. */
|
||
extern void maybe_set_unchanging PARAMS ((rtx, tree));
|
||
|
||
/* Given REF, a MEM, and T, either the type of X or the expression
|
||
corresponding to REF, set the memory attributes. OBJECTP is nonzero
|
||
if we are making a new object of this type. */
|
||
extern void set_mem_attributes PARAMS ((rtx, tree, int));
|
||
#endif
|
||
|
||
/* Assemble the static constant template for function entry trampolines. */
|
||
extern rtx assemble_trampoline_template PARAMS ((void));
|
||
|
||
/* Given rtx, return new rtx whose address won't be affected by
|
||
any side effects. It has been copied to a new temporary reg. */
|
||
extern rtx stabilize PARAMS ((rtx));
|
||
|
||
/* Given an rtx, copy all regs it refers to into new temps
|
||
and return a modified copy that refers to the new temps. */
|
||
extern rtx copy_all_regs PARAMS ((rtx));
|
||
|
||
/* Copy given rtx to a new temp reg and return that. */
|
||
extern rtx copy_to_reg PARAMS ((rtx));
|
||
|
||
/* Like copy_to_reg but always make the reg Pmode. */
|
||
extern rtx copy_addr_to_reg PARAMS ((rtx));
|
||
|
||
/* Like copy_to_reg but always make the reg the specified mode MODE. */
|
||
extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
|
||
|
||
/* Copy given rtx to given temp reg and return that. */
|
||
extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
|
||
|
||
/* Copy a value to a register if it isn't already a register.
|
||
Args are mode (in case value is a constant) and the value. */
|
||
extern rtx force_reg PARAMS ((enum machine_mode, rtx));
|
||
|
||
/* Return given rtx, copied into a new temp reg if it was in memory. */
|
||
extern rtx force_not_mem PARAMS ((rtx));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Return mode and signedness to use when object is promoted. */
|
||
extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
|
||
int *, int));
|
||
#endif
|
||
|
||
/* Remove some bytes from the stack. An rtx says how many. */
|
||
extern void adjust_stack PARAMS ((rtx));
|
||
|
||
/* Add some bytes to the stack. An rtx says how many. */
|
||
extern void anti_adjust_stack PARAMS ((rtx));
|
||
|
||
/* This enum is used for the following two functions. */
|
||
enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
|
||
|
||
/* Save the stack pointer at the specified level. */
|
||
extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
|
||
|
||
/* Restore the stack pointer from a save area of the specified level. */
|
||
extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
|
||
|
||
/* Allocate some space on the stack dynamically and return its address. An rtx
|
||
says how many bytes. */
|
||
extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
|
||
|
||
/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
|
||
FIRST is a constant and size is a Pmode RTX. These are offsets from the
|
||
current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
|
||
subtract from the stack. If SIZE is constant, this is done
|
||
with a fixed number of probes. Otherwise, we must make a loop. */
|
||
extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
|
||
|
||
/* Return an rtx that refers to the value returned by a library call
|
||
in its original home. This becomes invalid if any more code is emitted. */
|
||
extern rtx hard_libcall_value PARAMS ((enum machine_mode));
|
||
|
||
/* Given an rtx, return an rtx for a value rounded up to a multiple
|
||
of STACK_BOUNDARY / BITS_PER_UNIT. */
|
||
extern rtx round_push PARAMS ((rtx));
|
||
|
||
/* Return the mode desired by operand N of a particular bitfield
|
||
insert/extract insn, or MAX_MACHINE_MODE if no such insn is
|
||
available. */
|
||
|
||
enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
|
||
extern enum machine_mode
|
||
mode_for_extraction PARAMS ((enum extraction_pattern, int));
|
||
|
||
extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
enum machine_mode, rtx, HOST_WIDE_INT));
|
||
extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT, int, rtx,
|
||
enum machine_mode, enum machine_mode,
|
||
HOST_WIDE_INT));
|
||
extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
|
||
extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
|
||
extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
|
||
|
||
extern rtx assemble_static_space PARAMS ((int));
|
||
|
||
/* Hook called by expand_expr for language-specific tree codes.
|
||
It is up to the language front end to install a hook
|
||
if it has any such codes that expand_expr needs to know about. */
|
||
extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx,
|
||
enum machine_mode,
|
||
enum expand_modifier modifier));
|
||
|
||
extern int safe_from_p PARAMS ((rtx, tree, int));
|
||
|
||
/* Call this once to initialize the contents of the optabs
|
||
appropriately for the current target machine. */
|
||
extern void init_optabs PARAMS ((void));
|
||
extern void init_all_optabs PARAMS ((void));
|
||
|
||
/* Call this to initialize an optab function entry. */
|
||
extern rtx init_one_libfunc PARAMS ((const char *));
|
||
|
||
extern void do_jump_by_parts_equality_rtx PARAMS ((rtx, rtx, rtx));
|
||
extern void do_jump_by_parts_greater_rtx PARAMS ((enum machine_mode,
|
||
int, rtx, rtx, rtx,
|
||
rtx));
|
||
|
||
#ifdef TREE_CODE /* Don't lose if tree.h not included. */
|
||
extern void mark_seen_cases PARAMS ((tree, unsigned char *,
|
||
HOST_WIDE_INT, int));
|
||
#endif
|