/* Definitions for code generation pass of GNU compiler. Copyright (C) 1987-2017 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 . */ #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, machine_mode, rtx, int); /* 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); static 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); } static 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); } static 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 }; typedef rtx (*by_pieces_constfn) (void *, HOST_WIDE_INT, machine_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); 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, int); /* Similarly, but load into new temporaries. */ extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); /* 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, int); 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. */ static 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. */ static 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); /* 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, int); /* 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); 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, int, 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, int, rtx, rtx, int, rtx, bool); /* Extract the accessible bit-range from a COMPONENT_REF. */ extern void get_bit_range (unsigned HOST_WIDE_INT *, unsigned HOST_WIDE_INT *, tree, HOST_WIDE_INT *, 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_with_bounds (tree, rtx, int, bool, bool, tree); 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. */ static 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); } static inline rtx expand_normal (tree exp) { return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); } /* Return the tree node and offset if a given argument corresponds to a string constant. */ extern tree string_constant (tree, tree *); /* Two different ways of generating switch statements. */ extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int); extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int); 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 *, bool *); 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); #endif /* GCC_EXPR_H */