365 lines
14 KiB
C
365 lines
14 KiB
C
/* Definitions for code generation pass of GNU compiler.
|
||
Copyright (C) 1987-2023 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
|
||
|
||
/* 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,
|
||
or the memory is unaligned on a STRICT_ALIGNMENT target. */
|
||
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)
|
||
|
||
/* 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;
|
||
|
||
/* This is run during target initialization to set up which modes can be
|
||
used directly in memory and to initialize the block move optab. */
|
||
extern void init_expr_target (void);
|
||
|
||
/* This is run at the start of compiling a function. */
|
||
extern void init_expr (void);
|
||
|
||
/* 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 (rtx, rtx, int);
|
||
|
||
/* Convert an rtx to specified machine mode and return the result. */
|
||
extern rtx convert_to_mode (machine_mode, rtx, int);
|
||
|
||
/* Convert an rtx to MODE from OLDMODE and return the result. */
|
||
extern rtx convert_modes (machine_mode mode, machine_mode oldmode,
|
||
rtx x, int unsignedp);
|
||
|
||
/* Variant of convert_modes for ABI parameter passing/return. */
|
||
extern rtx convert_float_to_wider_int (machine_mode mode, machine_mode fmode,
|
||
rtx x);
|
||
|
||
/* Variant of convert_modes for ABI parameter passing/return. */
|
||
extern rtx convert_wider_int_to_float (machine_mode mode, machine_mode imode,
|
||
rtx x);
|
||
|
||
/* Expand a call to memcpy or memmove or memcmp, and return the result. */
|
||
extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx,
|
||
bool);
|
||
|
||
inline rtx
|
||
emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
|
||
{
|
||
return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall);
|
||
}
|
||
|
||
inline rtx
|
||
emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
|
||
{
|
||
return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall);
|
||
}
|
||
|
||
inline rtx
|
||
emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
|
||
{
|
||
return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall);
|
||
}
|
||
|
||
/* Emit code to move a block Y to a block X. */
|
||
enum block_op_methods
|
||
{
|
||
BLOCK_OP_NORMAL,
|
||
BLOCK_OP_NO_LIBCALL,
|
||
BLOCK_OP_CALL_PARM,
|
||
/* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
|
||
BLOCK_OP_TAILCALL,
|
||
/* Like BLOCK_OP_NO_LIBCALL, but instead of emitting a libcall return
|
||
pc_rtx to indicate nothing has been emitted and let the caller handle
|
||
it. */
|
||
BLOCK_OP_NO_LIBCALL_RET
|
||
};
|
||
|
||
typedef rtx (*by_pieces_constfn) (void *, void *, HOST_WIDE_INT,
|
||
fixed_size_mode);
|
||
|
||
/* The second pointer passed to by_pieces_constfn. */
|
||
struct by_pieces_prev
|
||
{
|
||
rtx data;
|
||
fixed_size_mode mode;
|
||
};
|
||
|
||
extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
|
||
extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
|
||
unsigned int, HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
bool bail_out_libcall = false,
|
||
bool *is_move_done = NULL,
|
||
bool might_overlap = false);
|
||
extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool,
|
||
by_pieces_constfn, void *);
|
||
extern bool emit_storent_insn (rtx to, rtx from);
|
||
|
||
/* 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 (int, rtx, int, 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 (int, rtx, int);
|
||
|
||
/* Generate a non-consecutive group of registers represented by a PARALLEL. */
|
||
extern rtx gen_group_rtx (rtx);
|
||
|
||
/* Load a BLKmode value into non-consecutive registers represented by a
|
||
PARALLEL. */
|
||
extern void emit_group_load (rtx, rtx, tree, poly_int64);
|
||
|
||
/* Similarly, but load into new temporaries. */
|
||
extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64);
|
||
|
||
/* Move a non-consecutive group of registers represented by a PARALLEL into
|
||
a non-consecutive group of registers represented by a PARALLEL. */
|
||
extern void emit_group_move (rtx, rtx);
|
||
|
||
/* Move a group of registers represented by a PARALLEL into pseudos. */
|
||
extern rtx emit_group_move_into_temps (rtx);
|
||
|
||
/* Store a BLKmode value from non-consecutive registers represented by a
|
||
PARALLEL. */
|
||
extern void emit_group_store (rtx, rtx, tree, poly_int64);
|
||
|
||
extern rtx maybe_emit_group_store (rtx, tree);
|
||
|
||
/* Mark REG as holding a parameter for the next CALL_INSN.
|
||
Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
|
||
extern void use_reg_mode (rtx *, rtx, machine_mode);
|
||
extern void clobber_reg_mode (rtx *, rtx, machine_mode);
|
||
|
||
extern rtx copy_blkmode_to_reg (machine_mode, tree);
|
||
|
||
/* Mark REG as holding a parameter for the next CALL_INSN. */
|
||
inline void
|
||
use_reg (rtx *fusage, rtx reg)
|
||
{
|
||
use_reg_mode (fusage, reg, VOIDmode);
|
||
}
|
||
|
||
/* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
|
||
inline void
|
||
clobber_reg (rtx *fusage, rtx reg)
|
||
{
|
||
clobber_reg_mode (fusage, reg, VOIDmode);
|
||
}
|
||
|
||
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
|
||
for the next CALL_INSN. */
|
||
extern void use_regs (rtx *, int, int);
|
||
|
||
/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
|
||
extern void use_group_regs (rtx *, rtx);
|
||
|
||
#ifdef GCC_INSN_CODES_H
|
||
extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx,
|
||
HOST_WIDE_INT);
|
||
#endif
|
||
|
||
/* Write zeros through the storage of OBJECT.
|
||
If OBJECT has BLKmode, SIZE is its length in bytes. */
|
||
extern rtx clear_storage (rtx, rtx, enum block_op_methods);
|
||
extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
|
||
unsigned int, HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned);
|
||
/* The same, but always output an library call. */
|
||
extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false);
|
||
|
||
/* Expand a setmem pattern; return true if successful. */
|
||
extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
|
||
unsigned int, HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT,
|
||
unsigned HOST_WIDE_INT);
|
||
|
||
/* Return nonzero 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.
|
||
MEMSETP is true if this is a real memset/bzero, not a copy
|
||
of a const string. */
|
||
extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
|
||
by_pieces_constfn,
|
||
void *, unsigned int, bool);
|
||
|
||
/* 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.
|
||
MEMSETP is true if this is a real memset/bzero, not a copy.
|
||
Returns TO + LEN. */
|
||
extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn,
|
||
void *, unsigned int, bool, memop_ret);
|
||
|
||
/* If can_store_by_pieces passes for worst-case values near MAX_LEN, call
|
||
store_by_pieces within conditionals so as to handle variable LEN efficiently,
|
||
storing VAL, if non-NULL_RTX, or valc instead. */
|
||
extern bool try_store_by_multiple_pieces (rtx to, rtx len,
|
||
unsigned int ctz_len,
|
||
unsigned HOST_WIDE_INT min_len,
|
||
unsigned HOST_WIDE_INT max_len,
|
||
rtx val, char valc,
|
||
unsigned int align);
|
||
|
||
/* Emit insns to set X from Y. */
|
||
extern rtx_insn *emit_move_insn (rtx, rtx);
|
||
extern rtx_insn *gen_move_insn (rtx, rtx);
|
||
|
||
/* Emit insns to set X from Y, with no frills. */
|
||
extern rtx_insn *emit_move_insn_1 (rtx, rtx);
|
||
|
||
extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx);
|
||
extern rtx_insn *emit_move_complex_parts (rtx, rtx);
|
||
extern rtx read_complex_part (rtx, bool);
|
||
extern void write_complex_part (rtx, rtx, bool, bool);
|
||
extern rtx read_complex_part (rtx, bool);
|
||
extern rtx emit_move_resolve_push (machine_mode, rtx);
|
||
|
||
/* Push a block of length SIZE (perhaps variable)
|
||
and return an rtx to address the beginning of the block. */
|
||
extern rtx push_block (rtx, poly_int64, int);
|
||
|
||
/* Generate code to push something onto the stack, given its mode and type. */
|
||
extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int,
|
||
int, rtx, poly_int64, rtx, rtx, int, rtx, bool);
|
||
|
||
/* Extract the accessible bit-range from a COMPONENT_REF. */
|
||
extern void get_bit_range (poly_uint64_pod *, poly_uint64_pod *, tree,
|
||
poly_int64_pod *, tree *);
|
||
|
||
/* Expand an assignment that stores the value of FROM into TO. */
|
||
extern void expand_assignment (tree, tree, bool);
|
||
|
||
/* 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 (tree, rtx, int, bool, bool);
|
||
|
||
/* 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 (rtx, rtx);
|
||
|
||
/* Work horses for expand_expr. */
|
||
extern rtx expand_expr_real (tree, rtx, machine_mode,
|
||
enum expand_modifier, rtx *, bool);
|
||
extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
|
||
enum expand_modifier, rtx *, bool);
|
||
extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
|
||
enum expand_modifier);
|
||
|
||
/* 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. */
|
||
inline rtx
|
||
expand_expr (tree exp, rtx target, machine_mode mode,
|
||
enum expand_modifier modifier)
|
||
{
|
||
return expand_expr_real (exp, target, mode, modifier, NULL, false);
|
||
}
|
||
|
||
inline rtx
|
||
expand_normal (tree exp)
|
||
{
|
||
return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
|
||
}
|
||
|
||
|
||
/* Return STRING_CST and set offset, size and decl, if the first
|
||
argument corresponds to a string constant. */
|
||
extern tree string_constant (tree, tree *, tree *, tree *);
|
||
/* Similar to string_constant, return a STRING_CST corresponding
|
||
to the value representation of the first argument if it's
|
||
a constant. */
|
||
extern tree byte_representation (tree, tree *, tree *, tree *);
|
||
|
||
extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *);
|
||
extern void maybe_optimize_sub_cmp_0 (enum tree_code, tree *, tree *);
|
||
|
||
/* Two different ways of generating switch statements. */
|
||
extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, profile_probability);
|
||
extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, profile_probability);
|
||
|
||
extern int safe_from_p (const_rtx, tree, int);
|
||
|
||
/* Get the personality libfunc for a function decl. */
|
||
rtx get_personality_function (tree);
|
||
|
||
/* Determine whether the LEN bytes can be moved by using several move
|
||
instructions. Return nonzero if a call to move_by_pieces should
|
||
succeed. */
|
||
extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
|
||
|
||
extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
|
||
|
||
extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
|
||
HOST_WIDE_INT *, HOST_WIDE_INT *,
|
||
bool *);
|
||
extern bool immediate_const_ctor_p (const_tree, unsigned int words = 1);
|
||
extern void store_constructor (tree, rtx, int, poly_int64, bool);
|
||
extern HOST_WIDE_INT int_expr_size (const_tree exp);
|
||
|
||
extern void expand_operands (tree, tree, rtx, rtx*, rtx*,
|
||
enum expand_modifier);
|
||
|
||
/* 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 (tree);
|
||
|
||
extern bool mem_ref_refers_to_non_mem_p (tree);
|
||
extern bool non_mem_decl_p (tree);
|
||
|
||
#endif /* GCC_EXPR_H */
|