| /* Definitions for code generation pass of GNU compiler. |
| Copyright (C) 1987-2021 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, 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, |
| /* 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 *, HOST_WIDE_INT, scalar_int_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. */ |
| 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, memop_ret); |
| |
| /* 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, 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. */ |
| 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 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 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 */ |