323 lines
12 KiB
C
323 lines
12 KiB
C
/* Definitions for code generation pass of GNU compiler.
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Copyright (C) 1987-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_EXPR_H
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#define GCC_EXPR_H
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/* This is the 4th arg to `expand_expr'.
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EXPAND_STACK_PARM means we are possibly expanding a call param onto
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the stack.
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EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
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EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
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EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
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is a constant that is not a legitimate address.
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EXPAND_WRITE means we are only going to write to the resulting rtx.
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EXPAND_MEMORY means we are interested in a memory result, even if
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the memory is constant and we could have propagated a constant value,
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or the memory is unaligned on a STRICT_ALIGNMENT target. */
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enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
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EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
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EXPAND_MEMORY};
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/* Prevent the compiler from deferring stack pops. See
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inhibit_defer_pop for more information. */
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#define NO_DEFER_POP (inhibit_defer_pop += 1)
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/* Allow the compiler to defer stack pops. See inhibit_defer_pop for
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more information. */
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#define OK_DEFER_POP (inhibit_defer_pop -= 1)
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/* This structure is used to pass around information about exploded
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unary, binary and trinary expressions between expand_expr_real_1 and
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friends. */
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typedef struct separate_ops
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{
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enum tree_code code;
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location_t location;
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tree type;
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tree op0, op1, op2;
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} *sepops;
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/* This is run during target initialization to set up which modes can be
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used directly in memory and to initialize the block move optab. */
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extern void init_expr_target (void);
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/* This is run at the start of compiling a function. */
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extern void init_expr (void);
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/* Emit some rtl insns to move data between rtx's, converting machine modes.
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Both modes must be floating or both fixed. */
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extern void convert_move (rtx, rtx, int);
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/* Convert an rtx to specified machine mode and return the result. */
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extern rtx convert_to_mode (machine_mode, rtx, int);
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/* Convert an rtx to MODE from OLDMODE and return the result. */
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extern rtx convert_modes (machine_mode, machine_mode, rtx, int);
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/* Expand a call to memcpy or memmove or memcmp, and return the result. */
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extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx,
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bool);
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static inline rtx
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emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
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{
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return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall);
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}
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static inline rtx
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emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
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{
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return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall);
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}
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static inline rtx
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emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
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{
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return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall);
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}
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/* Emit code to move a block Y to a block X. */
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enum block_op_methods
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{
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BLOCK_OP_NORMAL,
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BLOCK_OP_NO_LIBCALL,
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BLOCK_OP_CALL_PARM,
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/* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
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BLOCK_OP_TAILCALL,
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/* Like BLOCK_OP_NO_LIBCALL, but instead of emitting a libcall return
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pc_rtx to indicate nothing has been emitted and let the caller handle
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it. */
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BLOCK_OP_NO_LIBCALL_RET
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};
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typedef rtx (*by_pieces_constfn) (void *, HOST_WIDE_INT, scalar_int_mode);
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extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
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extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
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unsigned int, HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT);
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extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool,
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by_pieces_constfn, void *);
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extern bool emit_storent_insn (rtx to, rtx from);
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/* Copy all or part of a value X into registers starting at REGNO.
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The number of registers to be filled is NREGS. */
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extern void move_block_to_reg (int, rtx, int, machine_mode);
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/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
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The number of registers to be filled is NREGS. */
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extern void move_block_from_reg (int, rtx, int);
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/* Generate a non-consecutive group of registers represented by a PARALLEL. */
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extern rtx gen_group_rtx (rtx);
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/* Load a BLKmode value into non-consecutive registers represented by a
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PARALLEL. */
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extern void emit_group_load (rtx, rtx, tree, poly_int64);
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/* Similarly, but load into new temporaries. */
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extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64);
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/* Move a non-consecutive group of registers represented by a PARALLEL into
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a non-consecutive group of registers represented by a PARALLEL. */
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extern void emit_group_move (rtx, rtx);
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/* Move a group of registers represented by a PARALLEL into pseudos. */
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extern rtx emit_group_move_into_temps (rtx);
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/* Store a BLKmode value from non-consecutive registers represented by a
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PARALLEL. */
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extern void emit_group_store (rtx, rtx, tree, poly_int64);
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extern rtx maybe_emit_group_store (rtx, tree);
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/* Mark REG as holding a parameter for the next CALL_INSN.
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Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
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extern void use_reg_mode (rtx *, rtx, machine_mode);
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extern void clobber_reg_mode (rtx *, rtx, machine_mode);
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extern rtx copy_blkmode_to_reg (machine_mode, tree);
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/* Mark REG as holding a parameter for the next CALL_INSN. */
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static inline void
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use_reg (rtx *fusage, rtx reg)
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{
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use_reg_mode (fusage, reg, VOIDmode);
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}
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/* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
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static inline void
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clobber_reg (rtx *fusage, rtx reg)
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{
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clobber_reg_mode (fusage, reg, VOIDmode);
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}
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/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
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for the next CALL_INSN. */
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extern void use_regs (rtx *, int, int);
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/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
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extern void use_group_regs (rtx *, rtx);
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#ifdef GCC_INSN_CODES_H
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extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx,
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HOST_WIDE_INT);
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#endif
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/* Write zeros through the storage of OBJECT.
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If OBJECT has BLKmode, SIZE is its length in bytes. */
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extern rtx clear_storage (rtx, rtx, enum block_op_methods);
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extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
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unsigned int, HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT);
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/* The same, but always output an library call. */
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extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false);
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/* Expand a setmem pattern; return true if successful. */
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extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
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unsigned int, HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT,
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unsigned HOST_WIDE_INT);
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/* Return nonzero if it is desirable to store LEN bytes generated by
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CONSTFUN with several move instructions by store_by_pieces
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function. CONSTFUNDATA is a pointer which will be passed as argument
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in every CONSTFUN call.
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ALIGN is maximum alignment we can assume.
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MEMSETP is true if this is a real memset/bzero, not a copy
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of a const string. */
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extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
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by_pieces_constfn,
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void *, unsigned int, bool);
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/* Generate several move instructions to store LEN bytes generated by
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CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
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pointer which will be passed as argument in every CONSTFUN call.
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ALIGN is maximum alignment we can assume.
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MEMSETP is true if this is a real memset/bzero, not a copy.
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Returns TO + LEN. */
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extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn,
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void *, unsigned int, bool, memop_ret);
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/* Emit insns to set X from Y. */
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extern rtx_insn *emit_move_insn (rtx, rtx);
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extern rtx_insn *gen_move_insn (rtx, rtx);
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/* Emit insns to set X from Y, with no frills. */
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extern rtx_insn *emit_move_insn_1 (rtx, rtx);
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extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx);
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extern rtx_insn *emit_move_complex_parts (rtx, rtx);
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extern rtx read_complex_part (rtx, bool);
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extern void write_complex_part (rtx, rtx, bool);
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extern rtx read_complex_part (rtx, bool);
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extern rtx emit_move_resolve_push (machine_mode, rtx);
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/* Push a block of length SIZE (perhaps variable)
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and return an rtx to address the beginning of the block. */
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extern rtx push_block (rtx, poly_int64, int);
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/* Generate code to push something onto the stack, given its mode and type. */
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extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int,
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int, rtx, poly_int64, rtx, rtx, int, rtx, bool);
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/* Extract the accessible bit-range from a COMPONENT_REF. */
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extern void get_bit_range (poly_uint64_pod *, poly_uint64_pod *, tree,
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poly_int64_pod *, tree *);
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/* Expand an assignment that stores the value of FROM into TO. */
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extern void expand_assignment (tree, tree, bool);
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/* Generate code for computing expression EXP,
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and storing the value into TARGET.
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If SUGGEST_REG is nonzero, copy the value through a register
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and return that register, if that is possible. */
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extern rtx store_expr (tree, rtx, int, bool, bool);
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/* Given an rtx that may include add and multiply operations,
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generate them as insns and return a pseudo-reg containing the value.
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Useful after calling expand_expr with 1 as sum_ok. */
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extern rtx force_operand (rtx, rtx);
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/* Work horses for expand_expr. */
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extern rtx expand_expr_real (tree, rtx, machine_mode,
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enum expand_modifier, rtx *, bool);
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extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
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enum expand_modifier, rtx *, bool);
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extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
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enum expand_modifier);
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/* Generate code for computing expression EXP.
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An rtx for the computed value is returned. The value is never null.
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In the case of a void EXP, const0_rtx is returned. */
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static inline rtx
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expand_expr (tree exp, rtx target, machine_mode mode,
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enum expand_modifier modifier)
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{
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return expand_expr_real (exp, target, mode, modifier, NULL, false);
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}
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static inline rtx
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expand_normal (tree exp)
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{
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return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
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}
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/* Return the tree node and offset if a given argument corresponds to
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a string constant. */
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extern tree string_constant (tree, tree *, tree *, tree *);
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extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *);
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/* Two different ways of generating switch statements. */
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extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, profile_probability);
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extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, profile_probability);
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extern int safe_from_p (const_rtx, tree, int);
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/* Get the personality libfunc for a function decl. */
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rtx get_personality_function (tree);
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/* Determine whether the LEN bytes can be moved by using several move
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instructions. Return nonzero if a call to move_by_pieces should
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succeed. */
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extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
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extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
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extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
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HOST_WIDE_INT *, HOST_WIDE_INT *,
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bool *);
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extern void expand_operands (tree, tree, rtx, rtx*, rtx*,
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enum expand_modifier);
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/* rtl.h and tree.h were included. */
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/* Return an rtx for the size in bytes of the value of an expr. */
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extern rtx expr_size (tree);
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#endif /* GCC_EXPR_H */
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