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1 /* Export function prototypes from explow.c.
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2 Copyright (C) 2015-2020 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_EXPLOW_H
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21 #define GCC_EXPLOW_H
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22
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23 /* Return a memory reference like MEMREF, but which is known to have a
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24 valid address. */
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25 extern rtx validize_mem (rtx);
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26
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27 extern rtx use_anchored_address (rtx);
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28
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29 /* Copy given rtx to a new temp reg and return that. */
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30 extern rtx copy_to_reg (rtx);
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31
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32 /* Like copy_to_reg but always make the reg Pmode. */
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33 extern rtx copy_addr_to_reg (rtx);
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34
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35 /* Like copy_to_reg but always make the reg the specified mode MODE. */
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36 extern rtx copy_to_mode_reg (machine_mode, rtx);
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37
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38 /* Copy given rtx to given temp reg and return that. */
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39 extern rtx copy_to_suggested_reg (rtx, rtx, machine_mode);
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40
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41 /* Copy a value to a register if it isn't already a register.
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42 Args are mode (in case value is a constant) and the value. */
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43 extern rtx force_reg (machine_mode, rtx);
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44
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45 /* Return given rtx, copied into a new temp reg if it was in memory. */
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46 extern rtx force_not_mem (rtx);
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47
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48 /* Return mode and signedness to use when an argument or result in the
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49 given mode is promoted. */
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50 extern machine_mode promote_function_mode (const_tree, machine_mode, int *,
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51 const_tree, int);
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52
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53 /* Return mode and signedness to use when an object in the given mode
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54 is promoted. */
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55 extern machine_mode promote_mode (const_tree, machine_mode, int *);
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56
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57 /* Return mode and signedness to use when object is promoted. */
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58 machine_mode promote_decl_mode (const_tree, int *);
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59
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60 /* Return mode and signedness to use when object is promoted. */
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61 machine_mode promote_ssa_mode (const_tree, int *);
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62
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63 /* Remove some bytes from the stack. An rtx says how many. */
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64 extern void adjust_stack (rtx);
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65
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66 /* Add some bytes to the stack. An rtx says how many. */
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67 extern void anti_adjust_stack (rtx);
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68
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69 /* Add some bytes to the stack while probing it. An rtx says how many. */
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70 extern void anti_adjust_stack_and_probe (rtx, bool);
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71
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72 /* Support for building allocation/probing loops for stack-clash
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73 protection of dyamically allocated stack space. */
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74 extern void compute_stack_clash_protection_loop_data (rtx *, rtx *, rtx *,
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75 HOST_WIDE_INT *, rtx);
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76 extern void emit_stack_clash_protection_probe_loop_start (rtx *, rtx *,
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77 rtx, bool);
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78 extern void emit_stack_clash_protection_probe_loop_end (rtx, rtx,
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79 rtx, bool);
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80
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81 /* This enum is used for the following two functions. */
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82 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
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83
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84 /* Save the stack pointer at the specified level. */
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85 extern void emit_stack_save (enum save_level, rtx *);
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86
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87 /* Restore the stack pointer from a save area of the specified level. */
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88 extern void emit_stack_restore (enum save_level, rtx);
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89
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90 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
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91 extern void update_nonlocal_goto_save_area (void);
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92
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93 /* Record a new stack level. */
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94 extern void record_new_stack_level (void);
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95
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96 /* Allocate some space on the stack dynamically and return its address. */
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97 extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned,
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98 HOST_WIDE_INT, bool);
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99
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100 /* Calculate the necessary size of a constant dynamic stack allocation from the
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101 size of the variable area. */
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102 extern void get_dynamic_stack_size (rtx *, unsigned, unsigned, HOST_WIDE_INT *);
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103
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104 /* Returns the address of the dynamic stack space without allocating it. */
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105 extern rtx get_dynamic_stack_base (poly_int64, unsigned);
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106
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107 /* Return an rtx doing runtime alignment to REQUIRED_ALIGN on TARGET. */
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108 extern rtx align_dynamic_address (rtx, unsigned);
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109
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111
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110 /* Emit one stack probe at ADDRESS, an address within the stack. */
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111 extern void emit_stack_probe (rtx);
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112
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113 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
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114 FIRST is a constant and size is a Pmode RTX. These are offsets from
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115 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add
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116 or subtract them from the stack pointer. */
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117 extern void probe_stack_range (HOST_WIDE_INT, rtx);
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118
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119 /* Return an rtx that refers to the value returned by a library call
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120 in its original home. This becomes invalid if any more code is emitted. */
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121 extern rtx hard_libcall_value (machine_mode, rtx);
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122
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123 /* Return an rtx that refers to the value returned by a function
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124 in its original home. This becomes invalid if any more code is emitted. */
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125 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
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126
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127 /* Convert arg to a valid memory address for specified machine mode that points
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128 to a specific named address space, by emitting insns to perform arithmetic
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129 if necessary. */
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130 extern rtx memory_address_addr_space (machine_mode, rtx, addr_space_t);
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131
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132 extern rtx eliminate_constant_term (rtx, rtx *);
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133
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134 /* Like memory_address_addr_space, except assume the memory address points to
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135 the generic named address space. */
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136 #define memory_address(MODE,RTX) \
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137 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
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138
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139 #endif /* GCC_EXPLOW_H */
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