1 /* Export function prototypes from explow.c. 2 Copyright (C) 2015-2021 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #ifndef GCC_EXPLOW_H 21 #define GCC_EXPLOW_H 22 23 /* Return a memory reference like MEMREF, but which is known to have a 24 valid address. */ 25 extern rtx validize_mem (rtx); 26 27 extern rtx use_anchored_address (rtx); 28 29 /* Copy given rtx to a new temp reg and return that. */ 30 extern rtx copy_to_reg (rtx); 31 32 /* Like copy_to_reg but always make the reg Pmode. */ 33 extern rtx copy_addr_to_reg (rtx); 34 35 /* Like copy_to_reg but always make the reg the specified mode MODE. */ 36 extern rtx copy_to_mode_reg (machine_mode, rtx); 37 38 /* Copy given rtx to given temp reg and return that. */ 39 extern rtx copy_to_suggested_reg (rtx, rtx, machine_mode); 40 41 /* Copy a value to a register if it isn't already a register. 42 Args are mode (in case value is a constant) and the value. */ 43 extern rtx force_reg (machine_mode, rtx); 44 45 /* Return given rtx, copied into a new temp reg if it was in memory. */ 46 extern rtx force_not_mem (rtx); 47 48 /* Return mode and signedness to use when an argument or result in the 49 given mode is promoted. */ 50 extern machine_mode promote_function_mode (const_tree, machine_mode, int *, 51 const_tree, int); 52 53 /* Return mode and signedness to use when an object in the given mode 54 is promoted. */ 55 extern machine_mode promote_mode (const_tree, machine_mode, int *); 56 57 /* Return mode and signedness to use when object is promoted. */ 58 machine_mode promote_decl_mode (const_tree, int *); 59 60 /* Return mode and signedness to use when object is promoted. */ 61 machine_mode promote_ssa_mode (const_tree, int *); 62 63 /* Remove some bytes from the stack. An rtx says how many. */ 64 extern void adjust_stack (rtx); 65 66 /* Add some bytes to the stack. An rtx says how many. */ 67 extern void anti_adjust_stack (rtx); 68 69 /* Add some bytes to the stack while probing it. An rtx says how many. */ 70 extern void anti_adjust_stack_and_probe (rtx, bool); 71 72 /* Add some bytes to the stack while probing it. An rtx says how 73 many. Add additional probes to prevent stack clashing attacks. */ 74 extern void anti_adjust_stack_and_probe_stack_clash (rtx); 75 76 /* Support for building allocation/probing loops for stack-clash 77 protection of dyamically allocated stack space. */ 78 extern void compute_stack_clash_protection_loop_data (rtx *, rtx *, rtx *, 79 HOST_WIDE_INT *, rtx); 80 extern void emit_stack_clash_protection_probe_loop_start (rtx *, rtx *, 81 rtx, bool); 82 extern void emit_stack_clash_protection_probe_loop_end (rtx, rtx, 83 rtx, bool); 84 85 /* This enum is used for the following two functions. */ 86 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 87 88 /* Save the stack pointer at the specified level. */ 89 extern void emit_stack_save (enum save_level, rtx *); 90 91 /* Restore the stack pointer from a save area of the specified level. */ 92 extern void emit_stack_restore (enum save_level, rtx); 93 94 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */ 95 extern void update_nonlocal_goto_save_area (void); 96 97 /* Record a new stack level. */ 98 extern void record_new_stack_level (void); 99 100 /* Allocate some space on the stack dynamically and return its address. */ 101 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, 102 HOST_WIDE_INT, bool); 103 104 /* Calculate the necessary size of a constant dynamic stack allocation from the 105 size of the variable area. */ 106 extern void get_dynamic_stack_size (rtx *, unsigned, unsigned, HOST_WIDE_INT *); 107 108 /* Returns the address of the dynamic stack space without allocating it. */ 109 extern rtx get_dynamic_stack_base (poly_int64, unsigned, rtx); 110 111 /* Return an rtx doing runtime alignment to REQUIRED_ALIGN on TARGET. */ 112 extern rtx align_dynamic_address (rtx, unsigned); 113 114 /* Emit one stack probe at ADDRESS, an address within the stack. */ 115 extern void emit_stack_probe (rtx); 116 117 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 118 FIRST is a constant and size is a Pmode RTX. These are offsets from 119 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add 120 or subtract them from the stack pointer. */ 121 extern void probe_stack_range (HOST_WIDE_INT, rtx); 122 123 /* Return an rtx that refers to the value returned by a library call 124 in its original home. This becomes invalid if any more code is emitted. */ 125 extern rtx hard_libcall_value (machine_mode, rtx); 126 127 /* Return an rtx that refers to the value returned by a function 128 in its original home. This becomes invalid if any more code is emitted. */ 129 extern rtx hard_function_value (const_tree, const_tree, const_tree, int); 130 131 /* Convert arg to a valid memory address for specified machine mode that points 132 to a specific named address space, by emitting insns to perform arithmetic 133 if necessary. */ 134 extern rtx memory_address_addr_space (machine_mode, rtx, addr_space_t); 135 136 extern rtx eliminate_constant_term (rtx, rtx *); 137 138 /* Like memory_address_addr_space, except assume the memory address points to 139 the generic named address space. */ 140 #define memory_address(MODE,RTX) \ 141 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC) 142 143 #endif /* GCC_EXPLOW_H */ 144