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 : Wed Jul 25 16:42:02 2018 |
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13 | // Update Count : 438 |
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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.h" // libPow2 |
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25 | #include "bits/defs.h" // likely, unlikely |
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26 | #include "bits/locks.h" // __spinlock_t |
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27 | #include "startup.h" // STARTUP_PRIORITY_MEMORY |
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28 | #include "stdlib" // 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 prtHeapTerm = false; |
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97 | |
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98 | // inline _Bool prtHeapTerm() { |
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99 | // return prtHeapTerm; |
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100 | // } // prtHeapTerm |
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101 | |
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102 | // _Bool prtHeapTermOn() { |
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103 | // _Bool temp = traceHeap; |
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104 | // traceHeap = true; |
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105 | // return temp; |
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106 | // } // prtHeapTermOn |
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107 | |
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108 | // _Bool prtHeapTermOff() { |
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109 | // _Bool temp = traceHeap; |
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110 | // traceHeap = false; |
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111 | // return temp; |
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112 | // } // prtHeapTermOff |
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113 | |
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114 | |
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115 | // statically allocated variables => zero filled. |
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116 | |
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117 | static size_t pageSize; // architecture pagesize |
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118 | static size_t heapExpand; // sbrk advance |
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119 | static size_t mmapStart; // cross over point for mmap |
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120 | static unsigned int maxBucketsUsed; // maximum number of buckets in use |
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121 | static unsigned int bucketSizes[NoBucketSizes] = { // different bucket sizes |
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122 | 16, 32, 48, 64, |
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123 | 80, 96, 112, 128, 144, 160, 192, 224, |
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124 | 256, 320, 384, 448, 512, 640, 768, 896, |
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125 | 1024, 1536, 2048, 2560, 3072, 3584, 4096, 6144, |
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126 | 8192, 9216, 10240, 11264, 12288, 13312, 14336, 15360, |
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127 | 16384, 18432, 20480, 22528, 24576, 26624, 28672, 30720, |
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128 | 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440, |
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129 | 65536, 73728, 81920, 90112, 98304, 106496, 114688, 122880, |
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130 | 131072, 147456, 163840, 180224, 196608, 212992, 229376, 245760, |
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131 | 262144, 294912, 327680, 360448, 393216, 425984, 458752, 491520, |
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132 | 524288, 655360, 786432, 917504, 1048576, 1179648, 1310720, 1441792, |
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133 | 1572864, 1703936, 1835008, 1966080, 2097152, 2621440, 3145728, 3670016, |
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134 | 4194304 |
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135 | }; |
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136 | #ifdef FASTLOOKUP |
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137 | static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes |
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138 | #endif // FASTLOOKUP |
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139 | static int mmapFd = -1; // fake or actual fd for anonymous file |
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140 | |
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141 | static unsigned int allocfree; // running total of allocations minus frees |
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142 | static unsigned int appStart; // storage allocation when application starts |
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143 | |
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144 | static void checkUnfreed() { |
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145 | #ifdef __CFA_DEBUG__ |
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146 | unsigned int total = allocfree - appStart; |
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147 | if ( total != 0 ) { |
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148 | // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. |
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149 | // char helpText[512]; |
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150 | // 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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151 | // "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n", |
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152 | // (long int)getpid(), total, total ); // always print the UNIX pid |
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153 | // __cfaabi_dbg_bits_write( helpText, len ); |
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154 | } // if |
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155 | #endif // __CFA_DEBUG__ |
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156 | } // checkUnfreed |
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157 | |
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158 | #ifdef __CFA_DEBUG__ |
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159 | extern "C" { |
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160 | void heapAppStart() { // called by __cfaabi_appready_startup |
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161 | appStart = allocfree; |
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162 | } // heapAppStart |
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163 | |
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164 | void heapAppStop() { // called by __cfaabi_appready_startdown |
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165 | checkUnfreed(); |
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166 | } // heapAppStop |
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167 | } // extern "C" |
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168 | #endif // __CFA_DEBUG__ |
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169 | |
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170 | |
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171 | struct HeapManager { |
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172 | // struct FreeHeader; // forward declaration |
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173 | |
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174 | struct Storage { |
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175 | struct Header { // header |
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176 | union Kind { |
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177 | struct RealHeader { |
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178 | union { |
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179 | struct { // 32-bit word => 64-bit header, 64-bit word => 128-bit header |
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180 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __U_WORDSIZE__ == 32 |
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181 | uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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182 | #endif // __U_WORDSIZE__ == 32 && __U_WORDSIZE__ == 32 |
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183 | |
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184 | union { |
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185 | // FreeHeader * home; // allocated block points back to home locations (must overlay alignment) |
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186 | void * home; // allocated block points back to home locations (must overlay alignment) |
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187 | size_t blockSize; // size for munmap (must overlay alignment) |
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188 | #if BUCKLOCK == SPINLOCK |
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189 | Storage * next; // freed block points next freed block of same size |
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190 | #endif // SPINLOCK |
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191 | }; |
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192 | |
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193 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __U_WORDSIZE__ == 32 |
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194 | uint32_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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195 | #endif // __U_WORDSIZE__ == 32 && __U_WORDSIZE__ == 32 |
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196 | |
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197 | }; |
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198 | #if BUCKLOCK == LOCKFREE |
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199 | Stack<Storage>::Link next; // freed block points next freed block of same size (double-wide) |
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200 | #endif // LOCKFREE |
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201 | }; |
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202 | } real; |
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203 | struct FakeHeader { |
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204 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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205 | uint32_t alignment; // low-order bits of home/blockSize used for tricks |
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206 | #endif // __BYTE_ORDER__ |
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207 | |
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208 | uint32_t offset; |
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209 | |
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210 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
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211 | uint32_t alignment; // low-order bits of home/blockSize used for tricks |
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212 | #endif // __BYTE_ORDER__ |
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213 | } fake; |
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214 | } kind; |
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215 | } header; // Header |
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216 | char pad[ALIGN - sizeof( Header )]; |
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217 | char data[0]; // storage |
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218 | }; // Storage |
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219 | |
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220 | static_assert( ALIGN >= sizeof( Storage ), "ALIGN < sizeof( Storage )" ); |
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221 | |
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222 | struct FreeHeader { |
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223 | #if BUCKLOCK == SPINLOCK |
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224 | __spinlock_t lock; // must be first field for alignment |
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225 | Storage * freeList; |
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226 | #elif BUCKLOCK == LOCKFREE |
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227 | StackLF<Storage> freeList; |
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228 | #else |
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229 | #error undefined lock type for bucket lock |
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230 | #endif // SPINLOCK |
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231 | size_t blockSize; // size of allocations on this list |
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232 | }; // FreeHeader |
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233 | |
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234 | // must be first fields for alignment |
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235 | __spinlock_t extlock; // protects allocation-buffer extension |
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236 | FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes |
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237 | |
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238 | void * heapBegin; // start of heap |
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239 | void * heapEnd; // logical end of heap |
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240 | size_t heapRemaining; // amount of storage not allocated in the current chunk |
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241 | }; // HeapManager |
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242 | |
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243 | |
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244 | static inline _Bool setMmapStart( size_t value ) { |
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245 | if ( value < pageSize || bucketSizes[NoBucketSizes - 1] < value ) return true; |
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246 | mmapStart = value; // set global |
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247 | |
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248 | // find the closest bucket size less than or equal to the mmapStart size |
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249 | maxBucketsUsed = bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search |
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250 | assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ? |
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251 | assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ? |
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252 | return false; |
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253 | } // setMmapStart |
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254 | |
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255 | |
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256 | static void ?{}( HeapManager & manager ) with ( manager ) { |
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257 | pageSize = sysconf( _SC_PAGESIZE ); |
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258 | |
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259 | for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists |
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260 | freeLists[i].blockSize = bucketSizes[i]; |
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261 | } // for |
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262 | |
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263 | #ifdef FASTLOOKUP |
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264 | unsigned int idx = 0; |
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265 | for ( unsigned int i = 0; i < LookupSizes; i += 1 ) { |
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266 | if ( i > bucketSizes[idx] ) idx += 1; |
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267 | lookup[i] = idx; |
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268 | } // for |
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269 | #endif // FASTLOOKUP |
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270 | |
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271 | if ( setMmapStart( default_mmap_start() ) ) { |
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272 | abort( "HeapManager : internal error, mmap start initialization failure." ); |
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273 | } // if |
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274 | heapExpand = default_heap_expansion(); |
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275 | |
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276 | char * End = (char *)sbrk( 0 ); |
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277 | sbrk( (char *)libCeiling( (long unsigned int)End, libAlign() ) - End ); // move start of heap to multiple of alignment |
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278 | heapBegin = heapEnd = sbrk( 0 ); // get new start point |
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279 | } // HeapManager |
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280 | |
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281 | |
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282 | static void ^?{}( HeapManager & ) { |
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283 | #ifdef __STATISTICS__ |
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284 | // if ( prtHeapTerm() ) { |
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285 | // printStats(); |
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286 | // checkFree( heapManager, true ); |
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287 | // } // if |
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288 | #endif // __STATISTICS__ |
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289 | } // ~HeapManager |
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290 | |
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291 | |
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292 | #ifdef __CFA_DEBUG__ |
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293 | static _Bool heapBoot = 0; // detect recursion during boot |
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294 | #endif // __CFA_DEBUG__ |
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295 | static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing |
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296 | |
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297 | static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) )); |
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298 | void memory_startup( void ) { |
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299 | #ifdef __CFA_DEBUG__ |
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300 | if ( unlikely( heapBoot ) ) { // check for recursion during system boot |
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301 | // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. |
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302 | abort( "boot() : internal error, recursively invoked during system boot." ); |
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303 | } // if |
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304 | heapBoot = true; |
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305 | #endif // __CFA_DEBUG__ |
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306 | |
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307 | heapManager{}; |
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308 | } // memory_startup |
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309 | |
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310 | static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) )); |
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311 | void memory_shutdown( void ) { |
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312 | ^heapManager{}; |
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313 | } // memory_shutdown |
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314 | |
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315 | static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; } |
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316 | |
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317 | |
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318 | #ifdef __STATISTICS__ |
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319 | static unsigned long long int mmap_storage; // heap statistics counters |
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320 | static unsigned int mmap_calls; |
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321 | static unsigned long long int munmap_storage; |
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322 | static unsigned int munmap_calls; |
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323 | static unsigned long long int sbrk_storage; |
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324 | static unsigned int sbrk_calls; |
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325 | static unsigned long long int malloc_storage; |
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326 | static unsigned int malloc_calls; |
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327 | static unsigned long long int free_storage; |
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328 | static unsigned int free_calls; |
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329 | static unsigned long long int calloc_storage; |
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330 | static unsigned int calloc_calls; |
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331 | static unsigned long long int memalign_storage; |
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332 | static unsigned int memalign_calls; |
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333 | static unsigned long long int cmemalign_storage; |
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334 | static unsigned int cmemalign_calls; |
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335 | static unsigned long long int realloc_storage; |
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336 | static unsigned int realloc_calls; |
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337 | |
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338 | static int statfd; // statistics file descriptor (changed by malloc_stats_fd) |
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339 | |
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340 | |
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341 | // Use "write" because streams may be shutdown when calls are made. |
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342 | static void printStats() { |
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343 | char helpText[512]; |
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344 | int len = snprintf( helpText, 512, |
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345 | "\nHeap statistics:\n" |
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346 | " malloc: calls %u / storage %llu\n" |
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347 | " calloc: calls %u / storage %llu\n" |
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348 | " memalign: calls %u / storage %llu\n" |
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349 | " cmemalign: calls %u / storage %llu\n" |
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350 | " realloc: calls %u / storage %llu\n" |
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351 | " free: calls %u / storage %llu\n" |
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352 | " mmap: calls %u / storage %llu\n" |
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353 | " munmap: calls %u / storage %llu\n" |
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354 | " sbrk: calls %u / storage %llu\n", |
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355 | malloc_calls, malloc_storage, |
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356 | calloc_calls, calloc_storage, |
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357 | memalign_calls, memalign_storage, |
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358 | cmemalign_calls, cmemalign_storage, |
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359 | realloc_calls, realloc_storage, |
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360 | free_calls, free_storage, |
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361 | mmap_calls, mmap_storage, |
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362 | munmap_calls, munmap_storage, |
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363 | sbrk_calls, sbrk_storage |
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364 | ); |
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365 | write( statfd, helpText, len ); |
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366 | } // printStats |
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367 | |
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368 | |
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369 | static int printStatsXML( FILE * stream ) { |
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370 | char helpText[512]; |
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371 | int len = snprintf( helpText, 512, |
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372 | "<malloc version=\"1\">\n" |
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373 | "<heap nr=\"0\">\n" |
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374 | "<sizes>\n" |
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375 | "</sizes>\n" |
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376 | "<total type=\"malloc\" count=\"%u\" size=\"%llu\"/>\n" |
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377 | "<total type=\"calloc\" count=\"%u\" size=\"%llu\"/>\n" |
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378 | "<total type=\"memalign\" count=\"%u\" size=\"%llu\"/>\n" |
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379 | "<total type=\"cmemalign\" count=\"%u\" size=\"%llu\"/>\n" |
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380 | "<total type=\"realloc\" count=\"%u\" size=\"%llu\"/>\n" |
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381 | "<total type=\"free\" count=\"%u\" size=\"%llu\"/>\n" |
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382 | "<total type=\"mmap\" count=\"%u\" size=\"%llu\"/>\n" |
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383 | "<total type=\"munmap\" count=\"%u\" size=\"%llu\"/>\n" |
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384 | "<total type=\"sbrk\" count=\"%u\" size=\"%llu\"/>\n" |
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385 | "</malloc>", |
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386 | malloc_calls, malloc_storage, |
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387 | calloc_calls, calloc_storage, |
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388 | memalign_calls, memalign_storage, |
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389 | cmemalign_calls, cmemalign_storage, |
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390 | realloc_calls, realloc_storage, |
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391 | free_calls, free_storage, |
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392 | mmap_calls, mmap_storage, |
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393 | munmap_calls, munmap_storage, |
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394 | sbrk_calls, sbrk_storage |
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395 | ); |
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396 | return write( fileno( stream ), helpText, len ); // -1 => error |
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397 | } // printStatsXML |
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398 | #endif // __STATISTICS__ |
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399 | |
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400 | |
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401 | static inline void noMemory() { |
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402 | abort( "Heap memory exhausted at %zu bytes.\n" |
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403 | "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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404 | ((char *)(sbrk( 0 )) - (char *)(heapManager.heapBegin)) ); |
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405 | } // noMemory |
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406 | |
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407 | |
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408 | static inline void checkAlign( size_t alignment ) { |
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409 | if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) { |
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410 | abort( "Alignment %zu for memory allocation is less than sizeof(void *) and/or not a power of 2.", alignment ); |
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411 | } // if |
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412 | } // checkAlign |
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413 | |
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414 | |
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415 | static inline _Bool setHeapExpand( size_t value ) { |
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416 | if ( heapExpand < pageSize ) return true; |
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417 | heapExpand = value; |
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418 | return false; |
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419 | } // setHeapExpand |
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420 | |
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421 | |
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422 | static inline void checkHeader( _Bool check, const char * name, void * addr ) { |
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423 | if ( unlikely( check ) ) { // bad address ? |
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424 | abort( "Attempt to %s storage %p with address outside the heap.\n" |
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425 | "Possible cause is duplicate free on same block or overwriting of memory.", |
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426 | name, addr ); |
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427 | } // if |
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428 | } // checkHeader |
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429 | |
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430 | |
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431 | static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & size, size_t & alignment ) { |
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432 | if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ? |
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433 | size_t offset = header->kind.fake.offset; |
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434 | alignment = header->kind.fake.alignment & -2; // remove flag from value |
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435 | #ifdef __CFA_DEBUG__ |
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436 | checkAlign( alignment ); // check alignment |
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437 | #endif // __CFA_DEBUG__ |
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438 | header = (HeapManager.Storage.Header *)((char *)header - offset); |
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439 | } // if |
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440 | } // fakeHeader |
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441 | |
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442 | |
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443 | #define headerAddr( addr ) ((HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) )) |
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444 | |
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445 | static inline _Bool headers( const char * name, void * addr, HeapManager.Storage.Header *& header, HeapManager.FreeHeader *& freeElem, size_t & size, size_t & alignment ) with ( heapManager ) { |
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446 | header = headerAddr( addr ); |
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447 | |
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448 | if ( unlikely( heapEnd < addr ) ) { // mmapped ? |
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449 | fakeHeader( header, size, alignment ); |
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450 | size = header->kind.real.blockSize & -3; // mmap size |
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451 | return true; |
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452 | } // if |
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453 | |
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454 | #ifdef __CFA_DEBUG__ |
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455 | checkHeader( addr < heapBegin || header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ? |
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456 | #endif // __CFA_DEBUG__ |
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457 | // header may be safe to dereference |
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458 | fakeHeader( header, size, alignment ); |
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459 | #ifdef __CFA_DEBUG__ |
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460 | checkHeader( header < (HeapManager.Storage.Header *)heapBegin || (HeapManager.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -) |
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461 | #endif // __CFA_DEBUG__ |
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462 | |
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463 | freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3); |
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464 | #ifdef __CFA_DEBUG__ |
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465 | if ( freeElem < &freeLists[0] || &freeLists[NoBucketSizes] <= freeElem ) { |
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466 | abort( "Attempt to %s storage %p with corrupted header.\n" |
---|
467 | "Possible cause is duplicate free on same block or overwriting of header information.", |
---|
468 | name, addr ); |
---|
469 | } // if |
---|
470 | #endif // __CFA_DEBUG__ |
---|
471 | size = freeElem->blockSize; |
---|
472 | return false; |
---|
473 | } // headers |
---|
474 | |
---|
475 | |
---|
476 | static inline void * extend( size_t size ) with ( heapManager ) { |
---|
477 | lock( extlock __cfaabi_dbg_ctx2 ); |
---|
478 | ptrdiff_t rem = heapRemaining - size; |
---|
479 | if ( rem < 0 ) { |
---|
480 | // If the size requested is bigger than the current remaining storage, increase the size of the heap. |
---|
481 | |
---|
482 | size_t increase = libCeiling( size > heapExpand ? size : heapExpand, libAlign() ); |
---|
483 | if ( sbrk( increase ) == (void *)-1 ) { |
---|
484 | unlock( extlock ); |
---|
485 | errno = ENOMEM; |
---|
486 | return 0; |
---|
487 | } // if |
---|
488 | #ifdef __STATISTICS__ |
---|
489 | sbrk_calls += 1; |
---|
490 | sbrk_storage += increase; |
---|
491 | #endif // __STATISTICS__ |
---|
492 | #ifdef __CFA_DEBUG__ |
---|
493 | // Set new memory to garbage so subsequent uninitialized usages might fail. |
---|
494 | memset( (char *)heapEnd + heapRemaining, '\377', increase ); |
---|
495 | #endif // __CFA_DEBUG__ |
---|
496 | rem = heapRemaining + increase - size; |
---|
497 | } // if |
---|
498 | |
---|
499 | HeapManager.Storage * block = (HeapManager.Storage *)heapEnd; |
---|
500 | heapRemaining = rem; |
---|
501 | heapEnd = (char *)heapEnd + size; |
---|
502 | unlock( extlock ); |
---|
503 | return block; |
---|
504 | } // extend |
---|
505 | |
---|
506 | |
---|
507 | static inline void * doMalloc( size_t size ) with ( heapManager ) { |
---|
508 | HeapManager.Storage * block; |
---|
509 | |
---|
510 | // Look up size in the size list. Make sure the user request includes space for the header that must be allocated |
---|
511 | // along with the block and is a multiple of the alignment size. |
---|
512 | |
---|
513 | size_t tsize = size + sizeof(HeapManager.Storage); |
---|
514 | if ( likely( tsize < mmapStart ) ) { // small size => sbrk |
---|
515 | HeapManager.FreeHeader * freeElem = |
---|
516 | #ifdef FASTLOOKUP |
---|
517 | tsize < LookupSizes ? &freeLists[lookup[tsize]] : |
---|
518 | #endif // FASTLOOKUP |
---|
519 | bsearchl( tsize, freeLists, (size_t)maxBucketsUsed ); // binary search |
---|
520 | assert( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ? |
---|
521 | assert( tsize <= freeElem->blockSize ); // search failure ? |
---|
522 | tsize = freeElem->blockSize; // total space needed for request |
---|
523 | |
---|
524 | // Spin until the lock is acquired for this particular size of block. |
---|
525 | |
---|
526 | #if defined( SPINLOCK ) |
---|
527 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); |
---|
528 | block = freeElem->freeList; // remove node from stack |
---|
529 | #else |
---|
530 | block = freeElem->freeList.pop(); |
---|
531 | #endif // SPINLOCK |
---|
532 | if ( unlikely( block == 0 ) ) { // no free block ? |
---|
533 | #if defined( SPINLOCK ) |
---|
534 | unlock( freeElem->lock ); |
---|
535 | #endif // SPINLOCK |
---|
536 | // Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more |
---|
537 | // and then carve it off. |
---|
538 | |
---|
539 | block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call |
---|
540 | if ( unlikely( block == 0 ) ) return 0; |
---|
541 | #if defined( SPINLOCK ) |
---|
542 | } else { |
---|
543 | freeElem->freeList = block->header.kind.real.next; |
---|
544 | unlock( freeElem->lock ); |
---|
545 | #endif // SPINLOCK |
---|
546 | } // if |
---|
547 | |
---|
548 | block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size |
---|
549 | } else { // large size => mmap |
---|
550 | tsize = libCeiling( tsize, pageSize ); // must be multiple of page size |
---|
551 | #ifdef __STATISTICS__ |
---|
552 | __atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
553 | __atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST ); |
---|
554 | #endif // __STATISTICS__ |
---|
555 | block = (HeapManager.Storage *)mmap( 0, tsize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, mmapFd, 0 ); |
---|
556 | if ( block == (HeapManager.Storage *)MAP_FAILED ) { |
---|
557 | // Do not call strerror( errno ) as it may call malloc. |
---|
558 | abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu error:%d.", &heapManager, tsize, errno ); |
---|
559 | } // if |
---|
560 | #ifdef __CFA_DEBUG__ |
---|
561 | // Set new memory to garbage so subsequent uninitialized usages might fail. |
---|
562 | memset( block, '\377', tsize ); |
---|
563 | #endif // __CFA_DEBUG__ |
---|
564 | block->header.kind.real.blockSize = tsize; // storage size for munmap |
---|
565 | } // if |
---|
566 | |
---|
567 | void * area = &(block->data); // adjust off header to user bytes |
---|
568 | |
---|
569 | #ifdef __CFA_DEBUG__ |
---|
570 | assert( ((uintptr_t)area & (libAlign() - 1)) == 0 ); // minimum alignment ? |
---|
571 | __atomic_add_fetch( &allocfree, tsize, __ATOMIC_SEQ_CST ); |
---|
572 | if ( traceHeap() ) { |
---|
573 | enum { BufferSize = 64 }; |
---|
574 | char helpText[BufferSize]; |
---|
575 | int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", area, size, tsize ); |
---|
576 | // int len = snprintf( helpText, BufferSize, "Malloc %p %zu\n", area, size ); |
---|
577 | __cfaabi_dbg_bits_write( helpText, len ); |
---|
578 | } // if |
---|
579 | #endif // __CFA_DEBUG__ |
---|
580 | |
---|
581 | return area; |
---|
582 | } // doMalloc |
---|
583 | |
---|
584 | |
---|
585 | static inline void doFree( void * addr ) with ( heapManager ) { |
---|
586 | #ifdef __CFA_DEBUG__ |
---|
587 | if ( unlikely( heapManager.heapBegin == 0 ) ) { |
---|
588 | abort( "doFree( %p ) : internal error, called before heap is initialized.", addr ); |
---|
589 | } // if |
---|
590 | #endif // __CFA_DEBUG__ |
---|
591 | |
---|
592 | HeapManager.Storage.Header * header; |
---|
593 | HeapManager.FreeHeader * freeElem; |
---|
594 | size_t size, alignment; // not used (see realloc) |
---|
595 | |
---|
596 | if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ? |
---|
597 | #ifdef __STATISTICS__ |
---|
598 | __atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
599 | __atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST ); |
---|
600 | #endif // __STATISTICS__ |
---|
601 | if ( munmap( header, size ) == -1 ) { |
---|
602 | #ifdef __CFA_DEBUG__ |
---|
603 | abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n" |
---|
604 | "Possible cause is invalid pointer.", |
---|
605 | addr ); |
---|
606 | #endif // __CFA_DEBUG__ |
---|
607 | } // if |
---|
608 | } else { |
---|
609 | #ifdef __CFA_DEBUG__ |
---|
610 | // Set free memory to garbage so subsequent usages might fail. |
---|
611 | memset( ((HeapManager.Storage *)header)->data, '\377', freeElem->blockSize - sizeof( HeapManager.Storage ) ); |
---|
612 | #endif // __CFA_DEBUG__ |
---|
613 | |
---|
614 | #ifdef __STATISTICS__ |
---|
615 | free_storage += size; |
---|
616 | #endif // __STATISTICS__ |
---|
617 | #if defined( SPINLOCK ) |
---|
618 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock |
---|
619 | header->kind.real.next = freeElem->freeList; // push on stack |
---|
620 | freeElem->freeList = (HeapManager.Storage *)header; |
---|
621 | unlock( freeElem->lock ); // release spin lock |
---|
622 | #else |
---|
623 | freeElem->freeList.push( *(HeapManager.Storage *)header ); |
---|
624 | #endif // SPINLOCK |
---|
625 | } // if |
---|
626 | |
---|
627 | #ifdef __CFA_DEBUG__ |
---|
628 | __atomic_add_fetch( &allocfree, -size, __ATOMIC_SEQ_CST ); |
---|
629 | if ( traceHeap() ) { |
---|
630 | enum { BufferSize = 64 }; |
---|
631 | char helpText[BufferSize]; |
---|
632 | int len = snprintf( helpText, BufferSize, "Free( %p ) size:%zu\n", addr, size ); |
---|
633 | __cfaabi_dbg_bits_write( helpText, len ); |
---|
634 | } // if |
---|
635 | #endif // __CFA_DEBUG__ |
---|
636 | } // doFree |
---|
637 | |
---|
638 | |
---|
639 | size_t checkFree( HeapManager & manager, _Bool prt ) with ( manager ) { |
---|
640 | size_t total = 0; |
---|
641 | #ifdef __STATISTICS__ |
---|
642 | __cfaabi_dbg_bits_acquire(); |
---|
643 | if ( prt ) __cfaabi_dbg_bits_print_nolock( "\nBin lists (bin size : free blocks on list)\n" ); |
---|
644 | #endif // __STATISTICS__ |
---|
645 | for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) { |
---|
646 | size_t size = freeLists[i].blockSize; |
---|
647 | #ifdef __STATISTICS__ |
---|
648 | unsigned int N = 0; |
---|
649 | #endif // __STATISTICS__ |
---|
650 | #if defined( SPINLOCK ) |
---|
651 | for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0; p = p->header.kind.real.next ) { |
---|
652 | #else |
---|
653 | for ( HeapManager.Storage * p = freeLists[i].freeList.top(); p != 0; p = p->header.kind.real.next.top ) { |
---|
654 | #endif // SPINLOCK |
---|
655 | total += size; |
---|
656 | #ifdef __STATISTICS__ |
---|
657 | N += 1; |
---|
658 | #endif // __STATISTICS__ |
---|
659 | } // for |
---|
660 | #ifdef __STATISTICS__ |
---|
661 | if ( prt ) __cfaabi_dbg_bits_print_nolock( "%7zu, %-7u ", size, N ); |
---|
662 | if ( (i + 1) % 8 == 0 ) __cfaabi_dbg_bits_print_nolock( "\n" ); |
---|
663 | #endif // __STATISTICS__ |
---|
664 | } // for |
---|
665 | #ifdef __STATISTICS__ |
---|
666 | if ( prt ) __cfaabi_dbg_bits_print_nolock( "\ntotal free blocks:%zu\n", total ); |
---|
667 | __cfaabi_dbg_bits_release(); |
---|
668 | #endif // __STATISTICS__ |
---|
669 | return (char *)heapEnd - (char *)heapBegin - total; |
---|
670 | } // checkFree |
---|
671 | |
---|
672 | |
---|
673 | static inline void * malloc2( size_t size ) { // necessary for malloc statistics |
---|
674 | assert( heapManager.heapBegin != 0 ) ; // heap started |
---|
675 | void * area = doMalloc( size ); |
---|
676 | if ( unlikely( area == 0 ) ) errno = ENOMEM; // POSIX |
---|
677 | return area; |
---|
678 | } // malloc2 |
---|
679 | |
---|
680 | |
---|
681 | static inline void * memalign2( size_t alignment, size_t size ) { // necessary for malloc statistics |
---|
682 | #ifdef __CFA_DEBUG__ |
---|
683 | checkAlign( alignment ); // check alignment |
---|
684 | #endif // __CFA_DEBUG__ |
---|
685 | |
---|
686 | // if alignment <= default alignment, do normal malloc as two headers are unnecessary |
---|
687 | if ( unlikely( alignment <= libAlign() ) ) return malloc2( size ); |
---|
688 | |
---|
689 | // Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for |
---|
690 | // administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC. |
---|
691 | // .-------------v-----------------v----------------v----------, |
---|
692 | // | Real Header | ... padding ... | Fake Header | data ... | |
---|
693 | // `-------------^-----------------^-+--------------^----------' |
---|
694 | // |<--------------------------------' offset/align |<-- alignment boundary |
---|
695 | |
---|
696 | // subtract libAlign() because it is already the minimum alignment |
---|
697 | // add sizeof(Storage) for fake header |
---|
698 | char * area = (char *)doMalloc( size + alignment - libAlign() + sizeof(HeapManager.Storage) ); |
---|
699 | if ( unlikely( area == 0 ) ) return area; |
---|
700 | |
---|
701 | // address in the block of the "next" alignment address |
---|
702 | char * user = (char *)libCeiling( (uintptr_t)(area + sizeof(HeapManager.Storage)), alignment ); |
---|
703 | |
---|
704 | // address of header from malloc |
---|
705 | HeapManager.Storage.Header * realHeader = headerAddr( area ); |
---|
706 | // address of fake header * before* the alignment location |
---|
707 | HeapManager.Storage.Header * fakeHeader = headerAddr( user ); |
---|
708 | // SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment |
---|
709 | fakeHeader->kind.fake.offset = (char *)fakeHeader - (char *)realHeader; |
---|
710 | // SKULLDUGGERY: odd alignment imples fake header |
---|
711 | fakeHeader->kind.fake.alignment = alignment | 1; |
---|
712 | |
---|
713 | return user; |
---|
714 | } // memalign2 |
---|
715 | |
---|
716 | |
---|
717 | extern "C" { |
---|
718 | void * malloc( size_t size ) { |
---|
719 | #ifdef __STATISTICS__ |
---|
720 | __atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
721 | __atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
722 | #endif // __STATISTICS__ |
---|
723 | |
---|
724 | return malloc2( size ); |
---|
725 | } // malloc |
---|
726 | |
---|
727 | |
---|
728 | void * calloc( size_t noOfElems, size_t elemSize ) { |
---|
729 | size_t size = noOfElems * elemSize; |
---|
730 | #ifdef __STATISTICS__ |
---|
731 | __atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
732 | __atomic_add_fetch( &calloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
733 | #endif // __STATISTICS__ |
---|
734 | |
---|
735 | char * area = (char *)malloc2( size ); |
---|
736 | if ( unlikely( area == 0 ) ) return 0; |
---|
737 | HeapManager.Storage.Header * header; |
---|
738 | HeapManager.FreeHeader * freeElem; |
---|
739 | size_t asize, alignment; |
---|
740 | _Bool mapped __attribute__(( unused )) = headers( "calloc", area, header, freeElem, asize, alignment ); |
---|
741 | #ifndef __CFA_DEBUG__ |
---|
742 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
743 | if ( ! mapped ) |
---|
744 | #endif // __CFA_DEBUG__ |
---|
745 | memset( area, '\0', asize - sizeof(HeapManager.Storage) ); // set to zeros |
---|
746 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
747 | return area; |
---|
748 | } // calloc |
---|
749 | |
---|
750 | |
---|
751 | void * cmemalign( size_t alignment, size_t noOfElems, size_t elemSize ) { |
---|
752 | size_t size = noOfElems * elemSize; |
---|
753 | #ifdef __STATISTICS__ |
---|
754 | __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
755 | __atomic_add_fetch( &cmemalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
756 | #endif // __STATISTICS__ |
---|
757 | |
---|
758 | char * area = (char *)memalign2( alignment, size ); |
---|
759 | if ( unlikely( area == 0 ) ) return 0; |
---|
760 | HeapManager.Storage.Header * header; |
---|
761 | HeapManager.FreeHeader * freeElem; |
---|
762 | size_t asize; |
---|
763 | _Bool mapped __attribute__(( unused )) = headers( "cmemalign", area, header, freeElem, asize, alignment ); |
---|
764 | #ifndef __CFA_DEBUG__ |
---|
765 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
766 | if ( ! mapped ) |
---|
767 | #endif // __CFA_DEBUG__ |
---|
768 | memset( area, '\0', asize - ( (char *)area - (char *)header ) ); // set to zeros |
---|
769 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
770 | |
---|
771 | return area; |
---|
772 | } // cmemalign |
---|
773 | |
---|
774 | |
---|
775 | void * realloc( void * addr, size_t size ) { |
---|
776 | #ifdef __STATISTICS__ |
---|
777 | __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
778 | #endif // __STATISTICS__ |
---|
779 | |
---|
780 | if ( unlikely( addr == 0 ) ) return malloc2( size ); // special cases |
---|
781 | if ( unlikely( size == 0 ) ) { free( addr ); return 0; } |
---|
782 | |
---|
783 | HeapManager.Storage.Header * header; |
---|
784 | HeapManager.FreeHeader * freeElem; |
---|
785 | size_t asize, alignment = 0; |
---|
786 | headers( "realloc", addr, header, freeElem, asize, alignment ); |
---|
787 | |
---|
788 | size_t usize = asize - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block |
---|
789 | if ( usize >= size ) { // already sufficient storage |
---|
790 | // This case does not result in a new profiler entry because the previous one still exists and it must match with |
---|
791 | // the free for this memory. Hence, this realloc does not appear in the profiler output. |
---|
792 | return addr; |
---|
793 | } // if |
---|
794 | |
---|
795 | #ifdef __STATISTICS__ |
---|
796 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
797 | #endif // __STATISTICS__ |
---|
798 | |
---|
799 | void * area; |
---|
800 | if ( unlikely( alignment != 0 ) ) { // previous request memalign? |
---|
801 | area = memalign( alignment, size ); // create new area |
---|
802 | } else { |
---|
803 | area = malloc2( size ); // create new area |
---|
804 | } // if |
---|
805 | if ( unlikely( area == 0 ) ) return 0; |
---|
806 | if ( unlikely( header->kind.real.blockSize & 2 ) ) { // previous request zero fill (calloc/cmemalign) ? |
---|
807 | assert( (header->kind.real.blockSize & 1) == 0 ); |
---|
808 | _Bool mapped __attribute__(( unused )) = headers( "realloc", area, header, freeElem, asize, alignment ); |
---|
809 | #ifndef __CFA_DEBUG__ |
---|
810 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
811 | if ( ! mapped ) |
---|
812 | #endif // __CFA_DEBUG__ |
---|
813 | memset( (char *)area + usize, '\0', asize - ( (char *)area - (char *)header ) - usize ); // zero-fill back part |
---|
814 | header->kind.real.blockSize |= 2; // mark new request as zero fill |
---|
815 | } // if |
---|
816 | memcpy( area, addr, usize ); // copy bytes |
---|
817 | free( addr ); |
---|
818 | return area; |
---|
819 | } // realloc |
---|
820 | |
---|
821 | |
---|
822 | void * memalign( size_t alignment, size_t size ) { |
---|
823 | #ifdef __STATISTICS__ |
---|
824 | __atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
825 | __atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
826 | #endif // __STATISTICS__ |
---|
827 | |
---|
828 | void * area = memalign2( alignment, size ); |
---|
829 | |
---|
830 | return area; |
---|
831 | } // memalign |
---|
832 | |
---|
833 | |
---|
834 | void * aligned_alloc( size_t alignment, size_t size ) { |
---|
835 | return memalign( alignment, size ); |
---|
836 | } // aligned_alloc |
---|
837 | |
---|
838 | |
---|
839 | int posix_memalign( void ** memptr, size_t alignment, size_t size ) { |
---|
840 | if ( alignment < sizeof(void *) || ! libPow2( alignment ) ) return EINVAL; // check alignment |
---|
841 | * memptr = memalign( alignment, size ); |
---|
842 | if ( unlikely( * memptr == 0 ) ) return ENOMEM; |
---|
843 | return 0; |
---|
844 | } // posix_memalign |
---|
845 | |
---|
846 | |
---|
847 | void * valloc( size_t size ) { |
---|
848 | return memalign( pageSize, size ); |
---|
849 | } // valloc |
---|
850 | |
---|
851 | |
---|
852 | void free( void * addr ) { |
---|
853 | #ifdef __STATISTICS__ |
---|
854 | __atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST ); |
---|
855 | #endif // __STATISTICS__ |
---|
856 | |
---|
857 | if ( unlikely( addr == 0 ) ) { // special case |
---|
858 | #ifdef __CFA_DEBUG__ |
---|
859 | if ( traceHeap() ) { |
---|
860 | #define nullmsg "Free( 0x0 ) size:0\n" |
---|
861 | // Do not debug print free( 0 ), as it can cause recursive entry from sprintf. |
---|
862 | __cfaabi_dbg_bits_write( nullmsg, sizeof(nullmsg) - 1 ); |
---|
863 | } // if |
---|
864 | #endif // __CFA_DEBUG__ |
---|
865 | return; |
---|
866 | } // exit |
---|
867 | |
---|
868 | doFree( addr ); |
---|
869 | } // free |
---|
870 | |
---|
871 | int mallopt( int option, int value ) { |
---|
872 | choose( option ) { |
---|
873 | case M_TOP_PAD: |
---|
874 | if ( setHeapExpand( value ) ) fallthru default; |
---|
875 | case M_MMAP_THRESHOLD: |
---|
876 | if ( setMmapStart( value ) ) fallthru default; |
---|
877 | default: |
---|
878 | return 1; // success, or unsupported |
---|
879 | } // switch |
---|
880 | return 0; // error |
---|
881 | } // mallopt |
---|
882 | |
---|
883 | |
---|
884 | int malloc_trim( size_t ) { |
---|
885 | return 0; // => impossible to release memory |
---|
886 | } // malloc_trim |
---|
887 | |
---|
888 | size_t malloc_usable_size( void * addr ) { |
---|
889 | if ( unlikely( addr == 0 ) ) return 0; // null allocation has 0 size |
---|
890 | HeapManager.Storage.Header * header; |
---|
891 | HeapManager.FreeHeader * freeElem; |
---|
892 | size_t size, alignment; |
---|
893 | |
---|
894 | headers( "malloc_usable_size", addr, header, freeElem, size, alignment ); |
---|
895 | size_t usize = size - ( (char *)addr - (char *)header ); // compute the amount of user storage in the block |
---|
896 | return usize; |
---|
897 | } // malloc_usable_size |
---|
898 | |
---|
899 | |
---|
900 | size_t malloc_alignment( void * addr ) { |
---|
901 | if ( unlikely( addr == 0 ) ) return libAlign(); // minimum alignment |
---|
902 | HeapManager.Storage.Header * header = (HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) ); |
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903 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
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904 | return header->kind.fake.alignment & -2; // remove flag from value |
---|
905 | } else { |
---|
906 | return libAlign (); // minimum alignment |
---|
907 | } // if |
---|
908 | } // malloc_alignment |
---|
909 | |
---|
910 | |
---|
911 | _Bool malloc_zero_fill( void * addr ) { |
---|
912 | if ( unlikely( addr == 0 ) ) return false; // null allocation is not zero fill |
---|
913 | HeapManager.Storage.Header * header = (HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) ); |
---|
914 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
915 | header = (HeapManager.Storage.Header *)((char *)header - header->kind.fake.offset); |
---|
916 | } // if |
---|
917 | return (header->kind.real.blockSize & 2) != 0; // zero filled (calloc/cmemalign) ? |
---|
918 | } // malloc_zero_fill |
---|
919 | |
---|
920 | |
---|
921 | void malloc_stats( void ) { |
---|
922 | #ifdef __STATISTICS__ |
---|
923 | printStats(); |
---|
924 | checkFree( heapManager, true ); |
---|
925 | #endif // __STATISTICS__ |
---|
926 | } // malloc_stats |
---|
927 | |
---|
928 | |
---|
929 | int malloc_stats_fd( int fd ) { |
---|
930 | #ifdef __STATISTICS__ |
---|
931 | int temp = statfd; |
---|
932 | statfd = fd; |
---|
933 | return temp; |
---|
934 | #else |
---|
935 | return -1; |
---|
936 | #endif // __STATISTICS__ |
---|
937 | } // malloc_stats_fd |
---|
938 | |
---|
939 | |
---|
940 | int malloc_info( int options, FILE * stream ) { |
---|
941 | return printStatsXML( stream ); |
---|
942 | } // malloc_info |
---|
943 | |
---|
944 | |
---|
945 | void * malloc_get_state( void ) { |
---|
946 | return 0; |
---|
947 | } // malloc_get_state |
---|
948 | |
---|
949 | |
---|
950 | int malloc_set_state( void * ptr ) { |
---|
951 | return 0; |
---|
952 | } // malloc_set_state |
---|
953 | } // extern "C" |
---|
954 | |
---|
955 | |
---|
956 | // Local Variables: // |
---|
957 | // tab-width: 4 // |
---|
958 | // compile-command: "cfa -nodebug -O2 heap.c" // |
---|
959 | // End: // |
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