1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // heap.c -- |
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8 | // |
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9 | // Author : Peter A. Buhr |
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10 | // Created On : Tue Dec 19 21:58:35 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Tue Jul 31 18:08:50 2018 |
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13 | // Update Count : 470 |
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14 | // |
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15 | |
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16 | #include <unistd.h> // sbrk, sysconf |
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17 | #include <stdbool.h> // true, false |
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18 | #include <stdio.h> // snprintf, fileno |
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19 | #include <errno.h> // errno |
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20 | extern "C" { |
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21 | #include <sys/mman.h> // mmap, munmap |
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22 | } // extern "C" |
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23 | |
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24 | #include "bits/align.hfa" // libPow2 |
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25 | #include "bits/defs.hfa" // likely, unlikely |
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26 | #include "bits/locks.hfa" // __spinlock_t |
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27 | #include "startup.hfa" // STARTUP_PRIORITY_MEMORY |
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28 | #include "stdlib.hfa" // bsearchl |
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29 | #include "malloc.h" |
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30 | |
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31 | |
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32 | enum { |
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33 | __CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1), |
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34 | __CFA_DEFAULT_HEAP_EXPANSION__ = (1 * 1024 * 1024), |
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35 | }; |
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36 | |
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37 | size_t default_mmap_start() __attribute__(( weak )) { |
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38 | return __CFA_DEFAULT_MMAP_START__; |
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39 | } // default_mmap_start |
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40 | |
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41 | size_t default_heap_expansion() __attribute__(( weak )) { |
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42 | return __CFA_DEFAULT_HEAP_EXPANSION__; |
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43 | } // default_heap_expansion |
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44 | |
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45 | |
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46 | // supported mallopt options |
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47 | #ifndef M_MMAP_THRESHOLD |
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48 | #define M_MMAP_THRESHOLD (-1) |
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49 | #endif // M_TOP_PAD |
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50 | #ifndef M_TOP_PAD |
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51 | #define M_TOP_PAD (-2) |
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52 | #endif // M_TOP_PAD |
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53 | |
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54 | #define FASTLOOKUP |
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55 | #define __STATISTICS__ |
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56 | |
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57 | #define SPINLOCK 0 |
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58 | #define LOCKFREE 1 |
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59 | #define BUCKETLOCK SPINLOCK |
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60 | #if BUCKETLOCK == LOCKFREE |
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61 | #include <uStackLF.h> |
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62 | #endif // LOCKFREE |
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63 | |
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64 | #define ALIGN 16 |
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65 | |
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66 | // enum { NoBucketSizes = 93, // number of buckets sizes |
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67 | // #ifdef FASTLOOKUP |
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68 | // LookupSizes = 65536, // number of fast lookup sizes |
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69 | // #endif // FASTLOOKUP |
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70 | // }; |
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71 | #define NoBucketSizes 93 // number of buckets sizes |
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72 | #ifdef FASTLOOKUP |
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73 | #define LookupSizes 65536 // number of fast lookup sizes |
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74 | #endif // FASTLOOKUP |
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75 | |
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76 | |
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77 | static _Bool traceHeap = false; |
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78 | |
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79 | inline _Bool traceHeap() { |
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80 | return traceHeap; |
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81 | } // traceHeap |
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82 | |
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83 | _Bool traceHeapOn() { |
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84 | _Bool temp = traceHeap; |
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85 | traceHeap = true; |
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86 | return temp; |
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87 | } // traceHeapOn |
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88 | |
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89 | _Bool traceHeapOff() { |
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90 | _Bool temp = traceHeap; |
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91 | traceHeap = false; |
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92 | return temp; |
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93 | } // traceHeapOff |
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94 | |
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95 | |
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96 | static _Bool checkFree = false; |
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97 | |
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98 | inline _Bool checkFree() { |
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99 | return checkFree; |
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100 | } // checkFree |
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101 | |
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102 | _Bool checkFreeOn() { |
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103 | _Bool temp = checkFree; |
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104 | checkFree = true; |
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105 | return temp; |
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106 | } // checkFreeOn |
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107 | |
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108 | _Bool checkFreeOff() { |
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109 | _Bool temp = checkFree; |
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110 | checkFree = false; |
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111 | return temp; |
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112 | } // checkFreeOff |
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113 | |
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114 | |
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115 | // static _Bool traceHeapTerm = false; |
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116 | |
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117 | // inline _Bool traceHeapTerm() { |
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118 | // return traceHeapTerm; |
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119 | // } // traceHeapTerm |
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120 | |
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121 | // _Bool traceHeapTermOn() { |
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122 | // _Bool temp = traceHeapTerm; |
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123 | // traceHeapTerm = true; |
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124 | // return temp; |
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125 | // } // traceHeapTermOn |
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126 | |
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127 | // _Bool traceHeapTermOff() { |
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128 | // _Bool temp = traceHeapTerm; |
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129 | // traceHeapTerm = false; |
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130 | // return temp; |
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131 | // } // traceHeapTermOff |
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132 | |
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133 | |
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134 | #ifdef __CFA_DEBUG__ |
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135 | static unsigned int allocfree; // running total of allocations minus frees |
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136 | static unsigned int appStart; // storage allocation when application starts |
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137 | |
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138 | static void checkUnfreed() { |
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139 | unsigned int total = allocfree - appStart; |
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140 | if ( total != 0 ) { |
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141 | // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. |
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142 | // char helpText[512]; |
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143 | // int len = snprintf( helpText, 512, "CFA warning (UNIX pid:%ld) : program terminating with %u(0x%x) bytes of storage allocated but not freed.\n" |
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144 | // "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n", |
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145 | // (long int)getpid(), total, total ); // always print the UNIX pid |
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146 | // __cfaabi_dbg_bits_write( helpText, len ); |
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147 | } // if |
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148 | } // checkUnfreed |
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149 | |
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150 | extern "C" { |
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151 | void heapAppStart() { // called by __cfaabi_appready_startup |
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152 | appStart = allocfree; |
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153 | } // heapAppStart |
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154 | |
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155 | void heapAppStop() { // called by __cfaabi_appready_startdown |
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156 | checkUnfreed(); |
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157 | } // heapAppStop |
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158 | } // extern "C" |
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159 | #endif // __CFA_DEBUG__ |
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160 | |
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161 | |
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162 | struct HeapManager { |
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163 | // struct FreeHeader; // forward declaration |
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164 | |
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165 | struct Storage { |
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166 | struct Header { // header |
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167 | union Kind { |
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168 | struct RealHeader { |
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169 | union { |
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170 | struct { // 32-bit word => 64-bit header, 64-bit word => 128-bit header |
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171 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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172 | uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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173 | #endif // __ORDER_BIG_ENDIAN__ && __U_WORDSIZE__ == 32 |
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174 | |
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175 | union { |
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176 | // FreeHeader * home; // allocated block points back to home locations (must overlay alignment) |
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177 | void * home; // allocated block points back to home locations (must overlay alignment) |
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178 | size_t blockSize; // size for munmap (must overlay alignment) |
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179 | #if BUCKLOCK == SPINLOCK |
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180 | Storage * next; // freed block points next freed block of same size |
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181 | #endif // SPINLOCK |
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182 | }; |
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183 | |
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184 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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185 | uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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186 | #endif // __ORDER_LITTLE_ENDIAN__ && __U_WORDSIZE__ == 32 |
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187 | |
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188 | }; |
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189 | #if BUCKLOCK == LOCKFREE |
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190 | Stack<Storage>::Link next; // freed block points next freed block of same size (double-wide) |
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191 | #endif // LOCKFREE |
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192 | }; |
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193 | } real; |
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194 | struct FakeHeader { |
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195 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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196 | uint32_t alignment; // low-order bits of home/blockSize used for tricks |
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197 | #endif // __ORDER_LITTLE_ENDIAN__ |
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198 | |
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199 | uint32_t offset; |
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200 | |
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201 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
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202 | uint32_t alignment; // low-order bits of home/blockSize used for tricks |
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203 | #endif // __ORDER_BIG_ENDIAN__ |
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204 | } fake; |
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205 | } kind; |
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206 | } header; // Header |
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207 | char pad[ALIGN - sizeof( Header )]; |
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208 | char data[0]; // storage |
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209 | }; // Storage |
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210 | |
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211 | static_assert( ALIGN >= sizeof( Storage ), "ALIGN < sizeof( Storage )" ); |
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212 | |
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213 | struct FreeHeader { |
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214 | #if BUCKLOCK == SPINLOCK |
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215 | __spinlock_t lock; // must be first field for alignment |
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216 | Storage * freeList; |
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217 | #elif BUCKLOCK == LOCKFREE |
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218 | StackLF<Storage> freeList; |
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219 | #else |
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220 | #error undefined lock type for bucket lock |
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221 | #endif // SPINLOCK |
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222 | size_t blockSize; // size of allocations on this list |
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223 | }; // FreeHeader |
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224 | |
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225 | // must be first fields for alignment |
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226 | __spinlock_t extlock; // protects allocation-buffer extension |
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227 | FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes |
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228 | |
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229 | void * heapBegin; // start of heap |
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230 | void * heapEnd; // logical end of heap |
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231 | size_t heapRemaining; // amount of storage not allocated in the current chunk |
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232 | }; // HeapManager |
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233 | |
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234 | static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; } |
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235 | // statically allocated variables => zero filled. |
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236 | |
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237 | |
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238 | static size_t pageSize; // architecture pagesize |
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239 | static size_t heapExpand; // sbrk advance |
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240 | static size_t mmapStart; // cross over point for mmap |
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241 | static unsigned int maxBucketsUsed; // maximum number of buckets in use |
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242 | |
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243 | // Powers of 2 are common allocation sizes, so make powers of 2 generate the minimum required size. |
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244 | static unsigned int bucketSizes[NoBucketSizes] @= { // different bucket sizes |
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245 | 16, 32, 48, 64, |
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246 | 64 + sizeof(HeapManager.Storage), 96, 112, 128, 128 + sizeof(HeapManager.Storage), 160, 192, 224, |
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247 | 256 + sizeof(HeapManager.Storage), 320, 384, 448, 512 + sizeof(HeapManager.Storage), 640, 768, 896, |
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248 | 1_024 + sizeof(HeapManager.Storage), 1_536, 2_048 + sizeof(HeapManager.Storage), 2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), 6_144, |
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249 | 8_192 + sizeof(HeapManager.Storage), 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, |
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250 | 16_384 + sizeof(HeapManager.Storage), 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, |
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251 | 32_768 + sizeof(HeapManager.Storage), 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, |
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252 | 65_536 + sizeof(HeapManager.Storage), 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, |
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253 | 131_072 + sizeof(HeapManager.Storage), 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, |
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254 | 262_144 + sizeof(HeapManager.Storage), 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, |
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255 | 524_288 + sizeof(HeapManager.Storage), 655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), 1_179_648, 1_310_720, 1_441_792, |
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256 | 1_572_864, 1_703_936, 1_835_008, 1_966_080, 2_097_152 + sizeof(HeapManager.Storage), 2_621_440, 3_145_728, 3_670_016, |
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257 | 4_194_304 + sizeof(HeapManager.Storage) |
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258 | }; |
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259 | #ifdef FASTLOOKUP |
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260 | static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes |
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261 | #endif // FASTLOOKUP |
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262 | static int mmapFd = -1; // fake or actual fd for anonymous file |
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263 | |
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264 | |
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265 | #ifdef __CFA_DEBUG__ |
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266 | static _Bool heapBoot = 0; // detect recursion during boot |
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267 | #endif // __CFA_DEBUG__ |
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268 | static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing |
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269 | |
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270 | |
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271 | static inline _Bool setMmapStart( size_t value ) { |
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272 | if ( value < pageSize || bucketSizes[NoBucketSizes - 1] < value ) return true; |
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273 | mmapStart = value; // set global |
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274 | |
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275 | // find the closest bucket size less than or equal to the mmapStart size |
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276 | maxBucketsUsed = bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search |
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277 | assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ? |
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278 | assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ? |
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279 | return false; |
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280 | } // setMmapStart |
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281 | |
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282 | |
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283 | static void ?{}( HeapManager & manager ) with ( manager ) { |
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284 | pageSize = sysconf( _SC_PAGESIZE ); |
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285 | |
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286 | for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists |
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287 | freeLists[i].blockSize = bucketSizes[i]; |
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288 | } // for |
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289 | |
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290 | #ifdef FASTLOOKUP |
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291 | unsigned int idx = 0; |
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292 | for ( unsigned int i = 0; i < LookupSizes; i += 1 ) { |
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293 | if ( i > bucketSizes[idx] ) idx += 1; |
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294 | lookup[i] = idx; |
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295 | } // for |
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296 | #endif // FASTLOOKUP |
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297 | |
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298 | if ( setMmapStart( default_mmap_start() ) ) { |
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299 | abort( "HeapManager : internal error, mmap start initialization failure." ); |
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300 | } // if |
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301 | heapExpand = default_heap_expansion(); |
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302 | |
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303 | char * End = (char *)sbrk( 0 ); |
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304 | sbrk( (char *)libCeiling( (long unsigned int)End, libAlign() ) - End ); // move start of heap to multiple of alignment |
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305 | heapBegin = heapEnd = sbrk( 0 ); // get new start point |
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306 | } // HeapManager |
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307 | |
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308 | |
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309 | static void ^?{}( HeapManager & ) { |
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310 | #ifdef __STATISTICS__ |
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311 | // if ( traceHeapTerm() ) { |
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312 | // printStats(); |
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313 | // if ( checkfree() ) checkFree( heapManager, true ); |
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314 | // } // if |
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315 | #endif // __STATISTICS__ |
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316 | } // ~HeapManager |
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317 | |
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318 | |
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319 | static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) )); |
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320 | void memory_startup( void ) { |
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321 | #ifdef __CFA_DEBUG__ |
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322 | if ( unlikely( heapBoot ) ) { // check for recursion during system boot |
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323 | // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. |
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324 | abort( "boot() : internal error, recursively invoked during system boot." ); |
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325 | } // if |
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326 | heapBoot = true; |
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327 | #endif // __CFA_DEBUG__ |
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328 | |
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329 | assert( heapManager.heapBegin == 0 ); |
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330 | heapManager{}; |
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331 | } // memory_startup |
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332 | |
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333 | static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) )); |
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334 | void memory_shutdown( void ) { |
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335 | ^heapManager{}; |
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336 | } // memory_shutdown |
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337 | |
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338 | |
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339 | #ifdef __STATISTICS__ |
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340 | static unsigned long long int mmap_storage; // heap statistics counters |
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341 | static unsigned int mmap_calls; |
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342 | static unsigned long long int munmap_storage; |
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343 | static unsigned int munmap_calls; |
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344 | static unsigned long long int sbrk_storage; |
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345 | static unsigned int sbrk_calls; |
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346 | static unsigned long long int malloc_storage; |
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347 | static unsigned int malloc_calls; |
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348 | static unsigned long long int free_storage; |
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349 | static unsigned int free_calls; |
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350 | static unsigned long long int calloc_storage; |
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351 | static unsigned int calloc_calls; |
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352 | static unsigned long long int memalign_storage; |
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353 | static unsigned int memalign_calls; |
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354 | static unsigned long long int cmemalign_storage; |
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355 | static unsigned int cmemalign_calls; |
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356 | static unsigned long long int realloc_storage; |
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357 | static unsigned int realloc_calls; |
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358 | |
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359 | static int statfd; // statistics file descriptor (changed by malloc_stats_fd) |
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360 | |
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361 | |
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362 | // Use "write" because streams may be shutdown when calls are made. |
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363 | static void printStats() { |
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364 | char helpText[512]; |
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365 | __cfaabi_dbg_bits_print_buffer( helpText, 512, |
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366 | "\nHeap statistics:\n" |
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367 | " malloc: calls %u / storage %llu\n" |
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368 | " calloc: calls %u / storage %llu\n" |
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369 | " memalign: calls %u / storage %llu\n" |
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370 | " cmemalign: calls %u / storage %llu\n" |
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371 | " realloc: calls %u / storage %llu\n" |
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372 | " free: calls %u / storage %llu\n" |
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373 | " mmap: calls %u / storage %llu\n" |
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374 | " munmap: calls %u / storage %llu\n" |
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375 | " sbrk: calls %u / storage %llu\n", |
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376 | malloc_calls, malloc_storage, |
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377 | calloc_calls, calloc_storage, |
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378 | memalign_calls, memalign_storage, |
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379 | cmemalign_calls, cmemalign_storage, |
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380 | realloc_calls, realloc_storage, |
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381 | free_calls, free_storage, |
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382 | mmap_calls, mmap_storage, |
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383 | munmap_calls, munmap_storage, |
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384 | sbrk_calls, sbrk_storage |
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385 | ); |
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386 | } // printStats |
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387 | |
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388 | |
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389 | static int printStatsXML( FILE * stream ) { |
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390 | char helpText[512]; |
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391 | int len = snprintf( helpText, 512, |
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392 | "<malloc version=\"1\">\n" |
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393 | "<heap nr=\"0\">\n" |
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394 | "<sizes>\n" |
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395 | "</sizes>\n" |
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396 | "<total type=\"malloc\" count=\"%u\" size=\"%llu\"/>\n" |
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397 | "<total type=\"calloc\" count=\"%u\" size=\"%llu\"/>\n" |
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398 | "<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n" |
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399 | "<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n" |
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400 | "<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n" |
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401 | "<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n" |
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402 | "<total type=\"mmap\" count=\"%u\" size=\"%llu\"/>\n" |
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403 | "<total type=\"munmap\" count=\"%u\" size=\"%llu\"/>\n" |
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404 | "<total type=\"sbrk\" count=\"%u\" size=\"%llu\"/>\n" |
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405 | "</malloc>", |
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406 | malloc_calls, malloc_storage, |
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407 | calloc_calls, calloc_storage, |
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408 | memalign_calls, memalign_storage, |
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409 | cmemalign_calls, cmemalign_storage, |
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410 | realloc_calls, realloc_storage, |
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411 | free_calls, free_storage, |
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412 | mmap_calls, mmap_storage, |
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413 | munmap_calls, munmap_storage, |
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414 | sbrk_calls, sbrk_storage |
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415 | ); |
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416 | return write( fileno( stream ), helpText, len ); // -1 => error |
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417 | } // printStatsXML |
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418 | #endif // __STATISTICS__ |
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419 | |
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420 | |
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421 | static inline void noMemory() { |
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422 | abort( "Heap memory exhausted at %zu bytes.\n" |
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423 | "Possible cause is very large memory allocation and/or large amount of unfreed storage allocated by the program or system/library routines.", |
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424 | ((char *)(sbrk( 0 )) - (char *)(heapManager.heapBegin)) ); |
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425 | } // noMemory |
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426 | |
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427 | |
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428 | static inline void checkAlign( size_t alignment ) { |
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429 | if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) { |
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430 | abort( "Alignment %zu for memory allocation is less than sizeof(void *) and/or not a power of 2.", alignment ); |
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431 | } // if |
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432 | } // checkAlign |
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433 | |
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434 | |
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435 | static inline _Bool setHeapExpand( size_t value ) { |
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436 | if ( heapExpand < pageSize ) return true; |
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437 | heapExpand = value; |
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438 | return false; |
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439 | } // setHeapExpand |
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440 | |
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441 | |
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442 | static inline void checkHeader( _Bool check, const char * name, void * addr ) { |
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443 | if ( unlikely( check ) ) { // bad address ? |
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444 | abort( "Attempt to %s storage %p with address outside the heap.\n" |
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445 | "Possible cause is duplicate free on same block or overwriting of memory.", |
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446 | name, addr ); |
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447 | } // if |
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448 | } // checkHeader |
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449 | |
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450 | |
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451 | static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & size, size_t & alignment ) { |
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452 | if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ? |
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453 | size_t offset = header->kind.fake.offset; |
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454 | alignment = header->kind.fake.alignment & -2; // remove flag from value |
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455 | #ifdef __CFA_DEBUG__ |
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456 | checkAlign( alignment ); // check alignment |
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457 | #endif // __CFA_DEBUG__ |
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458 | header = (HeapManager.Storage.Header *)((char *)header - offset); |
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459 | } // if |
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460 | } // fakeHeader |
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461 | |
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462 | |
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463 | #define headerAddr( addr ) ((HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) )) |
---|
464 | |
---|
465 | static inline _Bool headers( const char * name, void * addr, HeapManager.Storage.Header *& header, HeapManager.FreeHeader *& freeElem, size_t & size, size_t & alignment ) with ( heapManager ) { |
---|
466 | header = headerAddr( addr ); |
---|
467 | |
---|
468 | if ( unlikely( heapEnd < addr ) ) { // mmapped ? |
---|
469 | fakeHeader( header, size, alignment ); |
---|
470 | size = header->kind.real.blockSize & -3; // mmap size |
---|
471 | return true; |
---|
472 | } // if |
---|
473 | |
---|
474 | #ifdef __CFA_DEBUG__ |
---|
475 | checkHeader( addr < heapBegin || header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ? |
---|
476 | #endif // __CFA_DEBUG__ |
---|
477 | // header may be safe to dereference |
---|
478 | fakeHeader( header, size, alignment ); |
---|
479 | #ifdef __CFA_DEBUG__ |
---|
480 | checkHeader( header < (HeapManager.Storage.Header *)heapBegin || (HeapManager.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -) |
---|
481 | #endif // __CFA_DEBUG__ |
---|
482 | |
---|
483 | freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3); |
---|
484 | #ifdef __CFA_DEBUG__ |
---|
485 | if ( freeElem < &freeLists[0] || &freeLists[NoBucketSizes] <= freeElem ) { |
---|
486 | abort( "Attempt to %s storage %p with corrupted header.\n" |
---|
487 | "Possible cause is duplicate free on same block or overwriting of header information.", |
---|
488 | name, addr ); |
---|
489 | } // if |
---|
490 | #endif // __CFA_DEBUG__ |
---|
491 | size = freeElem->blockSize; |
---|
492 | return false; |
---|
493 | } // headers |
---|
494 | |
---|
495 | |
---|
496 | static inline void * extend( size_t size ) with ( heapManager ) { |
---|
497 | lock( extlock __cfaabi_dbg_ctx2 ); |
---|
498 | ptrdiff_t rem = heapRemaining - size; |
---|
499 | if ( rem < 0 ) { |
---|
500 | // If the size requested is bigger than the current remaining storage, increase the size of the heap. |
---|
501 | |
---|
502 | size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() ); |
---|
503 | if ( sbrk( increase ) == (void *)-1 ) { |
---|
504 | unlock( extlock ); |
---|
505 | errno = ENOMEM; |
---|
506 | return 0; |
---|
507 | } // if |
---|
508 | #ifdef __STATISTICS__ |
---|
509 | sbrk_calls += 1; |
---|
510 | sbrk_storage += increase; |
---|
511 | #endif // __STATISTICS__ |
---|
512 | #ifdef __CFA_DEBUG__ |
---|
513 | // Set new memory to garbage so subsequent uninitialized usages might fail. |
---|
514 | memset( (char *)heapEnd + heapRemaining, '\377', increase ); |
---|
515 | #endif // __CFA_DEBUG__ |
---|
516 | rem = heapRemaining + increase - size; |
---|
517 | } // if |
---|
518 | |
---|
519 | HeapManager.Storage * block = (HeapManager.Storage *)heapEnd; |
---|
520 | heapRemaining = rem; |
---|
521 | heapEnd = (char *)heapEnd + size; |
---|
522 | unlock( extlock ); |
---|
523 | return block; |
---|
524 | } // extend |
---|
525 | |
---|
526 | |
---|
527 | static inline void * doMalloc( size_t size ) with ( heapManager ) { |
---|
528 | HeapManager.Storage * block; |
---|
529 | |
---|
530 | // Look up size in the size list. Make sure the user request includes space for the header that must be allocated |
---|
531 | // along with the block and is a multiple of the alignment size. |
---|
532 | |
---|
533 | size_t tsize = size + sizeof(HeapManager.Storage); |
---|
534 | if ( likely( tsize < mmapStart ) ) { // small size => sbrk |
---|
535 | HeapManager.FreeHeader * freeElem = |
---|
536 | #ifdef FASTLOOKUP |
---|
537 | tsize < LookupSizes ? &freeLists[lookup[tsize]] : |
---|
538 | #endif // FASTLOOKUP |
---|
539 | bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search |
---|
540 | assert( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ? |
---|
541 | assert( tsize <= freeElem->blockSize ); // search failure ? |
---|
542 | tsize = freeElem->blockSize; // total space needed for request |
---|
543 | |
---|
544 | // Spin until the lock is acquired for this particular size of block. |
---|
545 | |
---|
546 | #if defined( SPINLOCK ) |
---|
547 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); |
---|
548 | block = freeElem->freeList; // remove node from stack |
---|
549 | #else |
---|
550 | block = freeElem->freeList.pop(); |
---|
551 | #endif // SPINLOCK |
---|
552 | if ( unlikely( block == 0 ) ) { // no free block ? |
---|
553 | #if defined( SPINLOCK ) |
---|
554 | unlock( freeElem->lock ); |
---|
555 | #endif // SPINLOCK |
---|
556 | // Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more |
---|
557 | // and then carve it off. |
---|
558 | |
---|
559 | block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call |
---|
560 | if ( unlikely( block == 0 ) ) return 0; |
---|
561 | #if defined( SPINLOCK ) |
---|
562 | } else { |
---|
563 | freeElem->freeList = block->header.kind.real.next; |
---|
564 | unlock( freeElem->lock ); |
---|
565 | #endif // SPINLOCK |
---|
566 | } // if |
---|
567 | |
---|
568 | block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size |
---|
569 | } else { // large size => mmap |
---|
570 | tsize = libCeiling( tsize, pageSize ); // must be multiple of page size |
---|
571 | #ifdef __STATISTICS__ |
---|
572 | __atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
573 | __atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST ); |
---|
574 | #endif // __STATISTICS__ |
---|
575 | block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, mmapFd, 0 ); |
---|
576 | if ( block == (HeapManager.Storage *)MAP_FAILED ) { |
---|
577 | // Do not call strerror( errno ) as it may call malloc. |
---|
578 | abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu error:%d.", &heapManager, tsize, errno ); |
---|
579 | } // if |
---|
580 | #ifdef __CFA_DEBUG__ |
---|
581 | // Set new memory to garbage so subsequent uninitialized usages might fail. |
---|
582 | memset( block, '\377', tsize ); |
---|
583 | #endif // __CFA_DEBUG__ |
---|
584 | block->header.kind.real.blockSize = tsize; // storage size for munmap |
---|
585 | } // if |
---|
586 | |
---|
587 | void * area = &(block->data); // adjust off header to user bytes |
---|
588 | |
---|
589 | #ifdef __CFA_DEBUG__ |
---|
590 | assert( ((uintptr_t)area & (libAlign() - 1)) == 0 ); // minimum alignment ? |
---|
591 | __atomic_add_fetch( &allocfree, tsize, __ATOMIC_SEQ_CST ); |
---|
592 | if ( traceHeap() ) { |
---|
593 | enum { BufferSize = 64 }; |
---|
594 | char helpText[BufferSize]; |
---|
595 | int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", area, size, tsize ); |
---|
596 | // int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", area, size ); |
---|
597 | __cfaabi_dbg_bits_write( helpText, len ); |
---|
598 | } // if |
---|
599 | #endif // __CFA_DEBUG__ |
---|
600 | |
---|
601 | return area; |
---|
602 | } // doMalloc |
---|
603 | |
---|
604 | |
---|
605 | static inline void doFree( void * addr ) with ( heapManager ) { |
---|
606 | #ifdef __CFA_DEBUG__ |
---|
607 | if ( unlikely( heapManager.heapBegin == 0 ) ) { |
---|
608 | abort( "doFree( %p ) : internal error, called before heap is initialized.", addr ); |
---|
609 | } // if |
---|
610 | #endif // __CFA_DEBUG__ |
---|
611 | |
---|
612 | HeapManager.Storage.Header * header; |
---|
613 | HeapManager.FreeHeader * freeElem; |
---|
614 | size_t size, alignment; // not used (see realloc) |
---|
615 | |
---|
616 | if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ? |
---|
617 | #ifdef __STATISTICS__ |
---|
618 | __atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
619 | __atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST ); |
---|
620 | #endif // __STATISTICS__ |
---|
621 | if ( munmap( header, size ) == -1 ) { |
---|
622 | #ifdef __CFA_DEBUG__ |
---|
623 | abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n" |
---|
624 | "Possible cause is invalid pointer.", |
---|
625 | addr ); |
---|
626 | #endif // __CFA_DEBUG__ |
---|
627 | } // if |
---|
628 | } else { |
---|
629 | #ifdef __CFA_DEBUG__ |
---|
630 | // Set free memory to garbage so subsequent usages might fail. |
---|
631 | memset( ((HeapManager.Storage *)header)->data, '\377', freeElem->blockSize - sizeof( HeapManager.Storage ) ); |
---|
632 | #endif // __CFA_DEBUG__ |
---|
633 | |
---|
634 | #ifdef __STATISTICS__ |
---|
635 | free_storage += size; |
---|
636 | #endif // __STATISTICS__ |
---|
637 | #if defined( SPINLOCK ) |
---|
638 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock |
---|
639 | header->kind.real.next = freeElem->freeList; // push on stack |
---|
640 | freeElem->freeList = (HeapManager.Storage *)header; |
---|
641 | unlock( freeElem->lock ); // release spin lock |
---|
642 | #else |
---|
643 | freeElem->freeList.push( *(HeapManager.Storage *)header ); |
---|
644 | #endif // SPINLOCK |
---|
645 | } // if |
---|
646 | |
---|
647 | #ifdef __CFA_DEBUG__ |
---|
648 | __atomic_add_fetch( &allocfree, -size, __ATOMIC_SEQ_CST ); |
---|
649 | if ( traceHeap() ) { |
---|
650 | enum { BufferSize = 64 }; |
---|
651 | char helpText[BufferSize]; |
---|
652 | int len = snprintf( helpText, BufferSize, "Free( %p ) size:%zu\n", addr, size ); |
---|
653 | __cfaabi_dbg_bits_write( helpText, len ); |
---|
654 | } // if |
---|
655 | #endif // __CFA_DEBUG__ |
---|
656 | } // doFree |
---|
657 | |
---|
658 | |
---|
659 | size_t checkFree( HeapManager & manager ) with ( manager ) { |
---|
660 | size_t total = 0; |
---|
661 | #ifdef __STATISTICS__ |
---|
662 | __cfaabi_dbg_bits_acquire(); |
---|
663 | __cfaabi_dbg_bits_print_nolock( "\nBin lists (bin size : free blocks on list)\n" ); |
---|
664 | #endif // __STATISTICS__ |
---|
665 | for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) { |
---|
666 | size_t size = freeLists[i].blockSize; |
---|
667 | #ifdef __STATISTICS__ |
---|
668 | unsigned int N = 0; |
---|
669 | #endif // __STATISTICS__ |
---|
670 | #if defined( SPINLOCK ) |
---|
671 | for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0; p = p->header.kind.real.next ) { |
---|
672 | #else |
---|
673 | for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0; p = p->header.kind.real.next.top ) { |
---|
674 | #endif // SPINLOCK |
---|
675 | total += size; |
---|
676 | #ifdef __STATISTICS__ |
---|
677 | N += 1; |
---|
678 | #endif // __STATISTICS__ |
---|
679 | } // for |
---|
680 | #ifdef __STATISTICS__ |
---|
681 | __cfaabi_dbg_bits_print_nolock( "%7zu, %-7u ", size, N ); |
---|
682 | if ( (i + 1) % 8 == 0 ) __cfaabi_dbg_bits_print_nolock( "\n" ); |
---|
683 | #endif // __STATISTICS__ |
---|
684 | } // for |
---|
685 | #ifdef __STATISTICS__ |
---|
686 | __cfaabi_dbg_bits_print_nolock( "\ntotal free blocks:%zu\n", total ); |
---|
687 | __cfaabi_dbg_bits_release(); |
---|
688 | #endif // __STATISTICS__ |
---|
689 | return (char *)heapEnd - (char *)heapBegin - total; |
---|
690 | } // checkFree |
---|
691 | |
---|
692 | |
---|
693 | static inline void * malloc2( size_t size ) { // necessary for malloc statistics |
---|
694 | assert( heapManager.heapBegin != 0 ); |
---|
695 | void * area = doMalloc( size ); |
---|
696 | if ( unlikely( area == 0 ) ) errno = ENOMEM; // POSIX |
---|
697 | return area; |
---|
698 | } // malloc2 |
---|
699 | |
---|
700 | |
---|
701 | static inline void * memalign2( size_t alignment, size_t size ) { // necessary for malloc statistics |
---|
702 | #ifdef __CFA_DEBUG__ |
---|
703 | checkAlign( alignment ); // check alignment |
---|
704 | #endif // __CFA_DEBUG__ |
---|
705 | |
---|
706 | // if alignment <= default alignment, do normal malloc as two headers are unnecessary |
---|
707 | if ( unlikely( alignment <= libAlign() ) ) return malloc2( size ); |
---|
708 | |
---|
709 | // Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for |
---|
710 | // administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC. |
---|
711 | // .-------------v-----------------v----------------v----------, |
---|
712 | // | Real Header | ... padding ... | Fake Header | data ... | |
---|
713 | // `-------------^-----------------^-+--------------^----------' |
---|
714 | // |<--------------------------------' offset/align |<-- alignment boundary |
---|
715 | |
---|
716 | // subtract libAlign() because it is already the minimum alignment |
---|
717 | // add sizeof(Storage) for fake header |
---|
718 | char * area = (char *)doMalloc( size + alignment - libAlign() + sizeof(HeapManager.Storage) ); |
---|
719 | if ( unlikely( area == 0 ) ) return area; |
---|
720 | |
---|
721 | // address in the block of the "next" alignment address |
---|
722 | char * user = (char *)libCeiling( (uintptr_t)(area + sizeof(HeapManager.Storage)), alignment ); |
---|
723 | |
---|
724 | // address of header from malloc |
---|
725 | HeapManager.Storage.Header * realHeader = headerAddr( area ); |
---|
726 | // address of fake header * before* the alignment location |
---|
727 | HeapManager.Storage.Header * fakeHeader = headerAddr( user ); |
---|
728 | // SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment |
---|
729 | fakeHeader->kind.fake.offset = (char *)fakeHeader - (char *)realHeader; |
---|
730 | // SKULLDUGGERY: odd alignment imples fake header |
---|
731 | fakeHeader->kind.fake.alignment = alignment | 1; |
---|
732 | |
---|
733 | return user; |
---|
734 | } // memalign2 |
---|
735 | |
---|
736 | |
---|
737 | extern "C" { |
---|
738 | void * malloc( size_t size ) { |
---|
739 | #ifdef __STATISTICS__ |
---|
740 | __atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
741 | __atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
742 | #endif // __STATISTICS__ |
---|
743 | |
---|
744 | return malloc2( size ); |
---|
745 | } // malloc |
---|
746 | |
---|
747 | |
---|
748 | void * calloc( size_t noOfElems, size_t elemSize ) { |
---|
749 | size_t size = noOfElems * elemSize; |
---|
750 | #ifdef __STATISTICS__ |
---|
751 | __atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
752 | __atomic_add_fetch( &calloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
753 | #endif // __STATISTICS__ |
---|
754 | |
---|
755 | char * area = (char *)malloc2( size ); |
---|
756 | if ( unlikely( area == 0 ) ) return 0; |
---|
757 | HeapManager.Storage.Header * header; |
---|
758 | HeapManager.FreeHeader * freeElem; |
---|
759 | size_t asize, alignment; |
---|
760 | _Bool mapped __attribute__(( unused )) = headers( "calloc", area, header, freeElem, asize, alignment ); |
---|
761 | #ifndef __CFA_DEBUG__ |
---|
762 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
763 | if ( ! mapped ) |
---|
764 | #endif // __CFA_DEBUG__ |
---|
765 | memset( area, '\0', asize - sizeof(HeapManager.Storage) ); // set to zeros |
---|
766 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
767 | return area; |
---|
768 | } // calloc |
---|
769 | |
---|
770 | |
---|
771 | void * cmemalign( size_t alignment, size_t noOfElems, size_t elemSize ) { |
---|
772 | size_t size = noOfElems * elemSize; |
---|
773 | #ifdef __STATISTICS__ |
---|
774 | __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
775 | __atomic_add_fetch( &cmemalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
776 | #endif // __STATISTICS__ |
---|
777 | |
---|
778 | char * area = (char *)memalign2( alignment, size ); |
---|
779 | if ( unlikely( area == 0 ) ) return 0; |
---|
780 | HeapManager.Storage.Header * header; |
---|
781 | HeapManager.FreeHeader * freeElem; |
---|
782 | size_t asize; |
---|
783 | _Bool mapped __attribute__(( unused )) = headers( "cmemalign", area, header, freeElem, asize, alignment ); |
---|
784 | #ifndef __CFA_DEBUG__ |
---|
785 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
786 | if ( ! mapped ) |
---|
787 | #endif // __CFA_DEBUG__ |
---|
788 | memset( area, '\0', asize - ( (char *)area - (char *)header ) ); // set to zeros |
---|
789 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
790 | |
---|
791 | return area; |
---|
792 | } // cmemalign |
---|
793 | |
---|
794 | |
---|
795 | void * realloc( void * addr, size_t size ) { |
---|
796 | #ifdef __STATISTICS__ |
---|
797 | __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
798 | #endif // __STATISTICS__ |
---|
799 | |
---|
800 | if ( unlikely( addr == 0 ) ) return malloc2( size ); // special cases |
---|
801 | if ( unlikely( size == 0 ) ) { free( addr ); return 0; } |
---|
802 | |
---|
803 | HeapManager.Storage.Header * header; |
---|
804 | HeapManager.FreeHeader * freeElem; |
---|
805 | size_t asize, alignment = 0; |
---|
806 | headers( "realloc", addr, header, freeElem, asize, alignment ); |
---|
807 | |
---|
808 | size_t usize = asize - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block |
---|
809 | if ( usize >= size ) { // already sufficient storage |
---|
810 | // This case does not result in a new profiler entry because the previous one still exists and it must match with |
---|
811 | // the free for this memory. Hence, this realloc does not appear in the profiler output. |
---|
812 | return addr; |
---|
813 | } // if |
---|
814 | |
---|
815 | #ifdef __STATISTICS__ |
---|
816 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
817 | #endif // __STATISTICS__ |
---|
818 | |
---|
819 | void * area; |
---|
820 | if ( unlikely( alignment != 0 ) ) { // previous request memalign? |
---|
821 | area = memalign( alignment, size ); // create new area |
---|
822 | } else { |
---|
823 | area = malloc2( size ); // create new area |
---|
824 | } // if |
---|
825 | if ( unlikely( area == 0 ) ) return 0; |
---|
826 | if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill (calloc/cmemalign) ? |
---|
827 | assert( (header->kind.real.blockSize & 1) == 0 ); |
---|
828 | _Bool mapped __attribute__(( unused )) = headers( "realloc", area, header, freeElem, asize, alignment ); |
---|
829 | #ifndef __CFA_DEBUG__ |
---|
830 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
831 | if ( ! mapped ) |
---|
832 | #endif // __CFA_DEBUG__ |
---|
833 | memset( (char *)area + usize, '\0', asize - ( (char *)area - (char *)header ) - usize ); // zero-fill back part |
---|
834 | header->kind.real.blockSize |= 2; // mark new request as zero fill |
---|
835 | } // if |
---|
836 | memcpy( area, addr, usize ); // copy bytes |
---|
837 | free( addr ); |
---|
838 | return area; |
---|
839 | } // realloc |
---|
840 | |
---|
841 | |
---|
842 | void * memalign( size_t alignment, size_t size ) { |
---|
843 | #ifdef __STATISTICS__ |
---|
844 | __atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
845 | __atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
846 | #endif // __STATISTICS__ |
---|
847 | |
---|
848 | void * area = memalign2( alignment, size ); |
---|
849 | |
---|
850 | return area; |
---|
851 | } // memalign |
---|
852 | |
---|
853 | |
---|
854 | void * aligned_alloc( size_t alignment, size_t size ) { |
---|
855 | return memalign( alignment, size ); |
---|
856 | } // aligned_alloc |
---|
857 | |
---|
858 | |
---|
859 | int posix_memalign( void ** memptr, size_t alignment, size_t size ) { |
---|
860 | if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) return EINVAL; // check alignment |
---|
861 | * memptr = memalign( alignment, size ); |
---|
862 | if ( unlikely( * memptr == 0 ) ) return ENOMEM; |
---|
863 | return 0; |
---|
864 | } // posix_memalign |
---|
865 | |
---|
866 | |
---|
867 | void * valloc( size_t size ) { |
---|
868 | return memalign( pageSize, size ); |
---|
869 | } // valloc |
---|
870 | |
---|
871 | |
---|
872 | void free( void * addr ) { |
---|
873 | #ifdef __STATISTICS__ |
---|
874 | __atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST ); |
---|
875 | #endif // __STATISTICS__ |
---|
876 | |
---|
877 | if ( unlikely( addr == 0 ) ) { // special case |
---|
878 | #ifdef __CFA_DEBUG__ |
---|
879 | if ( traceHeap() ) { |
---|
880 | #define nullmsg "Free( 0x0 ) size:0\n" |
---|
881 | // Do not debug print free( 0 ), as it can cause recursive entry from sprintf. |
---|
882 | __cfaabi_dbg_bits_write( nullmsg, sizeof(nullmsg) - 1 ); |
---|
883 | } // if |
---|
884 | #endif // __CFA_DEBUG__ |
---|
885 | return; |
---|
886 | } // exit |
---|
887 | |
---|
888 | doFree( addr ); |
---|
889 | } // free |
---|
890 | |
---|
891 | int mallopt( int option, int value ) { |
---|
892 | choose( option ) { |
---|
893 | case M_TOP_PAD: |
---|
894 | if ( setHeapExpand( value ) ) fallthru default; |
---|
895 | case M_MMAP_THRESHOLD: |
---|
896 | if ( setMmapStart( value ) ) fallthru default; |
---|
897 | default: |
---|
898 | return 1; // success, or unsupported |
---|
899 | } // switch |
---|
900 | return 0; // error |
---|
901 | } // mallopt |
---|
902 | |
---|
903 | |
---|
904 | int malloc_trim( size_t ) { |
---|
905 | return 0; // => impossible to release memory |
---|
906 | } // malloc_trim |
---|
907 | |
---|
908 | size_t malloc_usable_size( void * addr ) { |
---|
909 | if ( unlikely( addr == 0 ) ) return 0; // null allocation has 0 size |
---|
910 | HeapManager.Storage.Header * header; |
---|
911 | HeapManager.FreeHeader * freeElem; |
---|
912 | size_t size, alignment; |
---|
913 | |
---|
914 | headers( "malloc_usable_size", addr, header, freeElem, size, alignment ); |
---|
915 | size_t usize = size - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block |
---|
916 | return usize; |
---|
917 | } // malloc_usable_size |
---|
918 | |
---|
919 | |
---|
920 | size_t malloc_alignment( void * addr ) { |
---|
921 | if ( unlikely( addr == 0 ) ) return libAlign(); // minimum alignment |
---|
922 | HeapManager.Storage.Header * header = (HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) ); |
---|
923 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
924 | return header->kind.fake.alignment & -2; // remove flag from value |
---|
925 | } else { |
---|
926 | return libAlign (); // minimum alignment |
---|
927 | } // if |
---|
928 | } // malloc_alignment |
---|
929 | |
---|
930 | |
---|
931 | _Bool malloc_zero_fill( void * addr ) { |
---|
932 | if ( unlikely( addr == 0 ) ) return false; // null allocation is not zero fill |
---|
933 | HeapManager.Storage.Header * header = (HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) ); |
---|
934 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
935 | header = (HeapManager.Storage.Header *)((char *)header - header->kind.fake.offset); |
---|
936 | } // if |
---|
937 | return (header->kind.real.blockSize & 2) != 0; // zero filled (calloc/cmemalign) ? |
---|
938 | } // malloc_zero_fill |
---|
939 | |
---|
940 | |
---|
941 | void malloc_stats( void ) { |
---|
942 | #ifdef __STATISTICS__ |
---|
943 | printStats(); |
---|
944 | if ( checkFree() ) checkFree( heapManager ); |
---|
945 | #endif // __STATISTICS__ |
---|
946 | } // malloc_stats |
---|
947 | |
---|
948 | |
---|
949 | int malloc_stats_fd( int fd ) { |
---|
950 | #ifdef __STATISTICS__ |
---|
951 | int temp = statfd; |
---|
952 | statfd = fd; |
---|
953 | return temp; |
---|
954 | #else |
---|
955 | return -1; |
---|
956 | #endif // __STATISTICS__ |
---|
957 | } // malloc_stats_fd |
---|
958 | |
---|
959 | |
---|
960 | int malloc_info( int options, FILE * stream ) { |
---|
961 | return printStatsXML( stream ); |
---|
962 | } // malloc_info |
---|
963 | |
---|
964 | |
---|
965 | void * malloc_get_state( void ) { |
---|
966 | return 0; |
---|
967 | } // malloc_get_state |
---|
968 | |
---|
969 | |
---|
970 | int malloc_set_state( void * ptr ) { |
---|
971 | return 0; |
---|
972 | } // malloc_set_state |
---|
973 | } // extern "C" |
---|
974 | |
---|
975 | |
---|
976 | // Local Variables: // |
---|
977 | // tab-width: 4 // |
---|
978 | // compile-command: "cfa -nodebug -O2 heap.c" // |
---|
979 | // End: // |
---|