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1 /* Infrastructure for tracking user variable locations and values
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2 throughout compilation.
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3 Copyright (C) 2010-2020 Free Software Foundation, Inc.
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4 Contributed by Alexandre Oliva <aoliva@redhat.com>.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #ifndef GCC_VALTRACK_H
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23 #define GCC_VALTRACK_H
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24
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25 /* Debug uses of dead regs. */
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26
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27 /* Entry that maps a dead pseudo (REG) used in a debug insns that dies
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28 at different blocks to the debug temp (DTEMP) it was replaced
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29 with. */
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30
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31 struct dead_debug_global_entry
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32 {
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33 rtx reg;
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34 rtx dtemp;
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35 };
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36
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37 /* Descriptor for hash_table to hash by dead_debug_global_entry's REG
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38 and map to DTEMP. */
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39
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40 struct dead_debug_hash_descr : free_ptr_hash <dead_debug_global_entry>
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41 {
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42 /* Hash on the pseudo number. */
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43 static inline hashval_t hash (const dead_debug_global_entry *my);
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44 /* Entries are identical if they refer to the same pseudo. */
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45 static inline bool equal (const dead_debug_global_entry *my,
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46 const dead_debug_global_entry *other);
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47 };
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48
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49 /* Hash on the pseudo number. */
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50 inline hashval_t
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51 dead_debug_hash_descr::hash (const dead_debug_global_entry *my)
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52 {
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53 return REGNO (my->reg);
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54 }
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55
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56 /* Entries are identical if they refer to the same pseudo. */
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57 inline bool
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58 dead_debug_hash_descr::equal (const dead_debug_global_entry *my,
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59 const dead_debug_global_entry *other)
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60 {
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61 return my->reg == other->reg;
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62 }
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63
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64 /* Maintain a global table of pseudos used in debug insns after their
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65 deaths in other blocks, and debug temps their deathpoint values are
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66 to be bound to. */
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67
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68 struct dead_debug_global
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69 {
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70 /* This hash table that maps pseudos to debug temps. */
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71 hash_table<dead_debug_hash_descr> *htab;
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72 /* For each entry in htab, the bit corresponding to its REGNO will
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73 be set. */
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74 bitmap used;
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75 };
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76
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77 /* Node of a linked list of uses of dead REGs in debug insns. */
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78
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79 struct dead_debug_use
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80 {
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81 df_ref use;
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82 struct dead_debug_use *next;
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83 };
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84
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85 /* Linked list of the above, with a bitmap of the REGs in the
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86 list. */
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87
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88 struct dead_debug_local
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89 {
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90 /* The first dead_debug_use entry in the list. */
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91 struct dead_debug_use *head;
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92 /* A pointer to the global tracking data structure. */
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93 struct dead_debug_global *global;
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94 /* A bitmap that has bits set for each REG used in the
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95 dead_debug_use list, and for each entry in the global hash
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96 table. */
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97 bitmap used;
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98 /* A bitmap that has bits set for each INSN that is to be
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99 rescanned. */
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100 bitmap to_rescan;
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101 };
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102
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103 /* This type controls the behavior of dead_debug_insert_temp WRT
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104 UREGNO and INSN. */
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105
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106 enum debug_temp_where
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107 {
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108 /* Bind a newly-created debug temporary to a REG for UREGNO, and
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109 insert the debug insn before INSN. REG is expected to die at
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110 INSN. */
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111 DEBUG_TEMP_BEFORE_WITH_REG = -1,
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112 /* Bind a newly-created debug temporary to the value INSN stores
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113 in REG, and insert the debug insn before INSN. */
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114 DEBUG_TEMP_BEFORE_WITH_VALUE = 0,
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115 /* Bind a newly-created debug temporary to a REG for UREGNO, and
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116 insert the debug insn after INSN. REG is expected to be set at
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117 INSN. */
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118 DEBUG_TEMP_AFTER_WITH_REG = 1,
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119 /* Like DEBUG_TEMP_AFTER_WITH_REG, but force addition of a debug
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120 temporary even if there is just a single debug use. This is used
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121 on regs that are becoming REG_DEAD on INSN and so uses of the
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122 reg later on are invalid. */
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123 DEBUG_TEMP_AFTER_WITH_REG_FORCE = 2
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124 };
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125
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126 extern void dead_debug_global_init (struct dead_debug_global *, bitmap);
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127 extern void dead_debug_global_finish (struct dead_debug_global *, bitmap);
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128 extern void dead_debug_local_init (struct dead_debug_local *, bitmap,
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129 struct dead_debug_global *);
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130 extern void dead_debug_local_finish (struct dead_debug_local *, bitmap);
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131 extern void dead_debug_add (struct dead_debug_local *, df_ref, unsigned int);
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132 extern int dead_debug_insert_temp (struct dead_debug_local *,
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133 unsigned int uregno, rtx_insn *insn,
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134 enum debug_temp_where);
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135
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136 extern void propagate_for_debug (rtx_insn *, rtx_insn *, rtx, rtx, basic_block);
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137
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138
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139 #endif /* GCC_VALTRACK_H */
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