annotate gcc/ggc.h @ 127:4c56639505ff

fix function.c and add CbC-example Makefile
author mir3636
date Wed, 11 Apr 2018 18:46:58 +0900
parents 04ced10e8804
children 84e7813d76e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Garbage collection for the GNU compiler.
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3 Copyright (C) 1998-2017 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #ifndef GCC_GGC_H
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22 #define GCC_GGC_H
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23
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24 /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
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25 an external gc library that might be linked in. */
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27 /* Internal functions and data structures used by the GTY
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28 machinery, including the generated gt*.[hc] files. */
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30 #include "gtype-desc.h"
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32 /* One of these applies its third parameter (with cookie in the fourth
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33 parameter) to each pointer in the object pointed to by the first
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34 parameter, using the second parameter. */
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35 typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
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36 void *);
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37
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38 /* One of these is called before objects are re-ordered in memory.
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39 The first parameter is the original object, the second is the
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40 subobject that has had its pointers reordered, the third parameter
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41 can compute the new values of a pointer when given the cookie in
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42 the fourth parameter. */
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43 typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
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44 void *);
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46 /* Used by the gt_pch_n_* routines. Register an object in the hash table. */
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47 extern int gt_pch_note_object (void *, void *, gt_note_pointers);
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49 /* Used by the gt_pch_n_* routines. Register that an object has a reorder
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50 function. */
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51 extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
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53 /* generated function to clear caches in gc memory. */
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54 extern void gt_clear_caches ();
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56 /* Mark the object in the first parameter and anything it points to. */
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57 typedef void (*gt_pointer_walker) (void *);
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58
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59 /* Structures for the easy way to mark roots.
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60 In an array, terminated by having base == NULL. */
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61 struct ggc_root_tab {
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62 void *base;
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63 size_t nelt;
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64 size_t stride;
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65 gt_pointer_walker cb;
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66 gt_pointer_walker pchw;
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67 };
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68 #define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
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69 /* Pointers to arrays of ggc_root_tab, terminated by NULL. */
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70 extern const struct ggc_root_tab * const gt_ggc_rtab[];
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71 extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
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72 extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
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74 /* If EXPR is not NULL and previously unmarked, mark it and evaluate
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75 to true. Otherwise evaluate to false. */
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76 #define ggc_test_and_set_mark(EXPR) \
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77 ((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
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79 #define ggc_mark(EXPR) \
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80 do { \
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81 const void *const a__ = (EXPR); \
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82 if (a__ != NULL && a__ != (void *) 1) \
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83 ggc_set_mark (a__); \
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84 } while (0)
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85
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86 /* Actually set the mark on a particular region of memory, but don't
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87 follow pointers. This function is called by ggc_mark_*. It
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88 returns zero if the object was not previously marked; nonzero if
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89 the object was already marked, or if, for any other reason,
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90 pointers in this data structure should not be traversed. */
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91 extern int ggc_set_mark (const void *);
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92
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93 /* Return 1 if P has been marked, zero otherwise.
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94 P must have been allocated by the GC allocator; it mustn't point to
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95 static objects, stack variables, or memory allocated with malloc. */
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96 extern int ggc_marked_p (const void *);
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97
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98 /* PCH and GGC handling for strings, mostly trivial. */
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99 extern void gt_pch_n_S (const void *);
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100 extern void gt_ggc_m_S (const void *);
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101
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102 /* End of GTY machinery API. */
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103
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104 /* Initialize the string pool. */
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105 extern void init_stringpool (void);
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106
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107 /* Initialize the garbage collector. */
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108 extern void init_ggc (void);
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109
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110 /* When true, identifier nodes are considered as GC roots. When
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111 false, identifier nodes are treated like any other GC-allocated
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112 object, and the identifier hash table is treated as a weak
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113 hash. */
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114 extern bool ggc_protect_identifiers;
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115
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116 /* Write out all GCed objects to F. */
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117 extern void gt_pch_save (FILE *f);
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118
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120 /* Allocation. */
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121
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122 /* The internal primitive. */
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123 extern void *ggc_internal_alloc (size_t, void (*)(void *), size_t,
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124 size_t CXX_MEM_STAT_INFO)
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125 ATTRIBUTE_MALLOC;
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126
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127 inline void *
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128 ggc_internal_alloc (size_t s CXX_MEM_STAT_INFO)
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129 {
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130 return ggc_internal_alloc (s, NULL, 0, 1 PASS_MEM_STAT);
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131 }
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132
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133 extern size_t ggc_round_alloc_size (size_t requested_size);
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134
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135 /* Allocates cleared memory. */
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136 extern void *ggc_internal_cleared_alloc (size_t, void (*)(void *),
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137 size_t, size_t
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138 CXX_MEM_STAT_INFO) ATTRIBUTE_MALLOC;
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139
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140 inline void *
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141 ggc_internal_cleared_alloc (size_t s CXX_MEM_STAT_INFO)
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142 {
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143 return ggc_internal_cleared_alloc (s, NULL, 0, 1 PASS_MEM_STAT);
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144 }
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145
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146 /* Resize a block. */
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147 extern void *ggc_realloc (void *, size_t CXX_MEM_STAT_INFO);
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148
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149 /* Free a block. To be used when known for certain it's not reachable. */
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150 extern void ggc_free (void *);
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152 extern void dump_ggc_loc_statistics (bool);
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153
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154 /* Reallocator. */
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155 #define GGC_RESIZEVEC(T, P, N) \
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156 ((T *) ggc_realloc ((P), (N) * sizeof (T) MEM_STAT_INFO))
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157
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158 template<typename T>
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159 void
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160 finalize (void *p)
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161 {
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162 static_cast<T *> (p)->~T ();
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163 }
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164
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165 template<typename T>
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166 inline bool
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167 need_finalization_p ()
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168 {
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169 #if GCC_VERSION >= 4003
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170 return !__has_trivial_destructor (T);
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171 #else
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172 return true;
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173 #endif
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174 }
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175
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176 template<typename T>
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177 inline T *
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178 ggc_alloc (ALONE_CXX_MEM_STAT_INFO)
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179 {
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180 if (need_finalization_p<T> ())
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181 return static_cast<T *> (ggc_internal_alloc (sizeof (T), finalize<T>, 0, 1
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182 PASS_MEM_STAT));
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183 else
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184 return static_cast<T *> (ggc_internal_alloc (sizeof (T), NULL, 0, 1
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185 PASS_MEM_STAT));
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186 }
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187
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188 template<typename T>
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189 inline T *
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190 ggc_cleared_alloc (ALONE_CXX_MEM_STAT_INFO)
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191 {
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192 if (need_finalization_p<T> ())
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193 return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T),
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194 finalize<T>, 0, 1
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195 PASS_MEM_STAT));
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196 else
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197 return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T), NULL, 0, 1
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198 PASS_MEM_STAT));
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199 }
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200
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201 template<typename T>
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202 inline T *
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203 ggc_vec_alloc (size_t c CXX_MEM_STAT_INFO)
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204 {
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205 if (need_finalization_p<T> ())
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206 return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), finalize<T>,
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207 sizeof (T), c PASS_MEM_STAT));
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208 else
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209 return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), NULL, 0, 0
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210 PASS_MEM_STAT));
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211 }
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212
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213 template<typename T>
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214 inline T *
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215 ggc_cleared_vec_alloc (size_t c CXX_MEM_STAT_INFO)
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216 {
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217 if (need_finalization_p<T> ())
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218 return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T),
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219 finalize<T>,
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220 sizeof (T), c
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221 PASS_MEM_STAT));
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222 else
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223 return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T), NULL,
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224 0, 0 PASS_MEM_STAT));
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225 }
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226
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227 inline void *
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228 ggc_alloc_atomic (size_t s CXX_MEM_STAT_INFO)
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229 {
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230 return ggc_internal_alloc (s PASS_MEM_STAT);
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231 }
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232
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233 /* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
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234 If LENGTH is -1, then CONTENTS is assumed to be a
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235 null-terminated string and the memory sized accordingly. */
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236 extern const char *ggc_alloc_string (const char *contents, int length
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237 CXX_MEM_STAT_INFO);
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238
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239 /* Make a copy of S, in GC-able memory. */
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240 #define ggc_strdup(S) ggc_alloc_string ((S), -1 MEM_STAT_INFO)
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241
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242 /* Invoke the collector. Garbage collection occurs only when this
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243 function is called, not during allocations. */
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244 extern void ggc_collect (void);
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245
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246 /* Assume that all GGC memory is reachable and grow the limits for next collection. */
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247 extern void ggc_grow (void);
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248
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249 /* Register an additional root table. This can be useful for some
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250 plugins. Does nothing if the passed pointer is NULL. */
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251 extern void ggc_register_root_tab (const struct ggc_root_tab *);
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252
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253 /* Read objects previously saved with gt_pch_save from F. */
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254 extern void gt_pch_restore (FILE *f);
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255
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256 /* Statistics. */
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257
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258 /* Print allocation statistics. */
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259 extern void ggc_print_statistics (void);
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260
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261 extern void stringpool_statistics (void);
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262
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263 /* Heuristics. */
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264 extern void init_ggc_heuristics (void);
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265
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266 #define ggc_alloc_rtvec_sized(NELT) \
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267 (rtvec_def *) ggc_internal_alloc (sizeof (struct rtvec_def) \
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268 + ((NELT) - 1) * sizeof (rtx)) \
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269
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270 /* Memory statistics passing versions of some allocators. Too few of them to
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271 make gengtype produce them, so just define the needed ones here. */
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272 inline struct rtx_def *
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273 ggc_alloc_rtx_def_stat (size_t s CXX_MEM_STAT_INFO)
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274 {
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275 return (struct rtx_def *) ggc_internal_alloc (s PASS_MEM_STAT);
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276 }
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277
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278 inline union tree_node *
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279 ggc_alloc_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
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280 {
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281 return (union tree_node *) ggc_internal_alloc (s PASS_MEM_STAT);
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282 }
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283
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284 inline union tree_node *
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285 ggc_alloc_cleared_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
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286 {
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287 return (union tree_node *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
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288 }
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289
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290 inline gimple *
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291 ggc_alloc_cleared_gimple_statement_stat (size_t s CXX_MEM_STAT_INFO)
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292 {
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293 return (gimple *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
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294 }
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295
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296 inline void
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297 gt_ggc_mx (const char *s)
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298 {
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299 ggc_test_and_set_mark (const_cast<char *> (s));
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300 }
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301
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302 inline void
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303 gt_pch_nx (const char *)
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304 {
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305 }
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306
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307 inline void
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308 gt_ggc_mx (int)
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309 {
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310 }
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311
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312 inline void
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313 gt_pch_nx (int)
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314 {
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315 }
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316
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317 inline void
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318 gt_pch_nx (unsigned int)
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319 {
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320 }
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321
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322 #endif