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/* Definitions for code generation pass of GNU compiler.
Copyright (C) 1987-2013 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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_EXPR_H
#define GCC_EXPR_H
/* For inhibit_defer_pop */
#include "function.h"
/* For XEXP, GEN_INT, rtx_code */
#include "rtl.h"
/* For optimize_size */
#include "flags.h"
/* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
#include "tree.h"
/* For GET_MODE_BITSIZE, word_mode */
#include "machmode.h"
/* This is the 4th arg to `expand_expr'.
EXPAND_STACK_PARM means we are possibly expanding a call param onto
the stack.
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.
EXPAND_MEMORY means we are interested in a memory result, even if
the memory is constant and we could have propagated a constant value. */
enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
EXPAND_MEMORY};
/* 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)
enum direction {none, upward, downward};
/* 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;
};
/* Package up various arg related fields of struct args for
locate_and_pad_parm. */
struct locate_and_pad_arg_data
{
/* Size of this argument on the stack, rounded up for any padding it
gets. If REG_PARM_STACK_SPACE is defined, then register parms are
counted here, otherwise they aren't. */
struct args_size size;
/* Offset of this argument from beginning of stack-args. */
struct args_size offset;
/* Offset to the start of the stack slot. Different from OFFSET
if this arg pads downward. */
struct args_size slot_offset;
/* The amount that the stack pointer needs to be adjusted to
force alignment for the next argument. */
struct args_size alignment_pad;
/* Which way we should pad this arg. */
enum direction where_pad;
/* slot_offset is at least this aligned. */
unsigned int boundary;
};
/* 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 = fold_convert (ssizetype, inc); \
else \
(TO).var = size_binop (PLUS_EXPR, (TO).var, \
fold_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), \
fold_convert (ssizetype, dec)); \
else \
(TO).var = size_binop (MINUS_EXPR, (TO).var, \
fold_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, fold_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_normal (ARGS_SIZE_TREE (SIZE)))
/* This structure is used to pass around information about exploded
unary, binary and trinary expressions between expand_expr_real_1 and
friends. */
typedef struct separate_ops
{
enum tree_code code;
location_t location;
tree type;
tree op0, op1, op2;
} *sepops;
/* 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 (enum machine_mode, enum rtx_code, rtx,
rtx, rtx, int, enum optab_methods);
extern rtx expand_simple_unop (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 (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 (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. */
extern rtx gen_add2_insn (rtx, rtx);
extern rtx gen_add3_insn (rtx, rtx, rtx);
extern rtx gen_sub2_insn (rtx, rtx);
extern rtx gen_sub3_insn (rtx, rtx, rtx);
extern rtx gen_move_insn (rtx, rtx);
extern int have_add2_insn (rtx, rtx);
extern int have_sub2_insn (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 (rtx, rtx, enum rtx_code, rtx,
enum machine_mode, int, rtx, int prob=-1);
/* Generate code to indirectly jump to a location given in the rtx LOC. */
extern void emit_indirect_jump (rtx);
/* Generate a conditional trap instruction. */
extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
#include "insn-config.h"
#ifdef HAVE_conditional_move
/* Emit a conditional move operation. */
rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
rtx, rtx, enum machine_mode, int);
/* Return nonzero if the conditional move is supported. */
int can_conditionally_move_p (enum machine_mode mode);
#endif
rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
rtx, rtx, enum machine_mode, int);
rtx expand_sync_operation (rtx, rtx, enum rtx_code);
rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
rtx expand_atomic_load (rtx, rtx, enum memmodel);
rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
bool);
rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
rtx expand_atomic_clear (rtx, enum memmodel);
void expand_atomic_thread_fence (enum memmodel);
void expand_atomic_signal_fence (enum memmodel);
/* Functions from expmed.c: */
/* Arguments MODE, RTX: return an rtx for the negation of that value.
May emit insns. */
extern rtx negate_rtx (enum machine_mode, rtx);
/* Expand a logical AND operation. */
extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
/* Emit a store-flag operation. */
extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
int, int);
/* Like emit_store_flag, but always succeeds. */
extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
enum machine_mode, int, int);
/* Choose a minimal N + 1 bit approximation to 1/D that can be used to
replace division by D, and put the least significant N bits of the result
in *MULTIPLIER_PTR and return the most significant bit. */
extern unsigned HOST_WIDE_INT choose_multiplier (unsigned HOST_WIDE_INT, int,
int, unsigned HOST_WIDE_INT *,
int *, int *);
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