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.cfa -- |
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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 Apr 20 21:20:48 2021 |
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13 | // Update Count : 1033 |
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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 <stdlib.h> // EXIT_FAILURE |
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18 | #include <stdbool.h> // true, false |
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19 | #include <stdio.h> // snprintf, fileno |
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20 | #include <errno.h> // errno |
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21 | #include <string.h> // memset, memcpy |
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22 | #include <limits.h> // ULONG_MAX |
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23 | #include <malloc.h> // memalign, malloc_usable_size |
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24 | #include <sys/mman.h> // mmap, munmap |
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25 | |
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26 | #include "bits/align.hfa" // libAlign |
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27 | #include "bits/defs.hfa" // likely, unlikely |
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28 | #include "bits/locks.hfa" // __spinlock_t |
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29 | #include "startup.hfa" // STARTUP_PRIORITY_MEMORY |
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30 | #include "math.hfa" // ceiling |
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31 | #include "bitmanip.hfa" // is_pow2, ceiling2 |
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32 | |
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33 | static bool traceHeap = false; |
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34 | |
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35 | inline bool traceHeap() { return traceHeap; } |
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36 | |
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37 | bool traceHeapOn() { |
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38 | bool temp = traceHeap; |
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39 | traceHeap = true; |
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40 | return temp; |
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41 | } // traceHeapOn |
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42 | |
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43 | bool traceHeapOff() { |
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44 | bool temp = traceHeap; |
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45 | traceHeap = false; |
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46 | return temp; |
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47 | } // traceHeapOff |
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48 | |
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49 | bool traceHeapTerm() { return false; } |
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50 | |
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51 | |
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52 | static bool prtFree = false; |
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53 | |
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54 | bool prtFree() { |
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55 | return prtFree; |
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56 | } // prtFree |
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57 | |
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58 | bool prtFreeOn() { |
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59 | bool temp = prtFree; |
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60 | prtFree = true; |
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61 | return temp; |
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62 | } // prtFreeOn |
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63 | |
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64 | bool prtFreeOff() { |
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65 | bool temp = prtFree; |
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66 | prtFree = false; |
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67 | return temp; |
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68 | } // prtFreeOff |
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69 | |
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70 | |
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71 | enum { |
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72 | // Define the default extension heap amount in units of bytes. When the uC++ supplied heap reaches the brk address, |
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73 | // the brk address is extended by the extension amount. |
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74 | __CFA_DEFAULT_HEAP_EXPANSION__ = (10 * 1024 * 1024), |
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75 | |
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76 | // Define the mmap crossover point during allocation. Allocations less than this amount are allocated from buckets; |
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77 | // values greater than or equal to this value are mmap from the operating system. |
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78 | __CFA_DEFAULT_MMAP_START__ = (512 * 1024 + 1), |
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79 | }; |
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80 | |
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81 | size_t default_mmap_start() __attribute__(( weak )) { |
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82 | return __CFA_DEFAULT_MMAP_START__; |
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83 | } // default_mmap_start |
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84 | |
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85 | size_t default_heap_expansion() __attribute__(( weak )) { |
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86 | return __CFA_DEFAULT_HEAP_EXPANSION__; |
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87 | } // default_heap_expansion |
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88 | |
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89 | |
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90 | #ifdef __CFA_DEBUG__ |
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91 | static size_t allocUnfreed; // running total of allocations minus frees |
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92 | |
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93 | static void prtUnfreed() { |
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94 | if ( allocUnfreed != 0 ) { |
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95 | // DO NOT USE STREAMS AS THEY MAY BE UNAVAILABLE AT THIS POINT. |
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96 | char helpText[512]; |
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97 | int len = snprintf( helpText, sizeof(helpText), "CFA warning (UNIX pid:%ld) : program terminating with %zu(0x%zx) bytes of storage allocated but not freed.\n" |
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98 | "Possible cause is unfreed storage allocated by the program or system/library routines called from the program.\n", |
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99 | (long int)getpid(), allocUnfreed, allocUnfreed ); // always print the UNIX pid |
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100 | __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug |
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101 | } // if |
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102 | } // prtUnfreed |
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103 | |
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104 | extern "C" { |
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105 | void heapAppStart() { // called by __cfaabi_appready_startup |
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106 | allocUnfreed = 0; |
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107 | } // heapAppStart |
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108 | |
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109 | void heapAppStop() { // called by __cfaabi_appready_startdown |
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110 | fclose( stdin ); fclose( stdout ); |
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111 | prtUnfreed(); |
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112 | } // heapAppStop |
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113 | } // extern "C" |
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114 | #endif // __CFA_DEBUG__ |
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115 | |
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116 | |
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117 | // statically allocated variables => zero filled. |
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118 | size_t __page_size; // architecture pagesize |
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119 | int __map_prot; // common mmap/mprotect protection |
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120 | static size_t heapExpand; // sbrk advance |
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121 | static size_t mmapStart; // cross over point for mmap |
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122 | static unsigned int maxBucketsUsed; // maximum number of buckets in use |
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123 | |
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124 | |
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125 | #define SPINLOCK 0 |
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126 | #define LOCKFREE 1 |
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127 | #define BUCKETLOCK SPINLOCK |
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128 | #if BUCKETLOCK == SPINLOCK |
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129 | #elif BUCKETLOCK == LOCKFREE |
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130 | #include <stackLockFree.hfa> |
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131 | #else |
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132 | #error undefined lock type for bucket lock |
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133 | #endif // LOCKFREE |
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134 | |
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135 | // Recursive definitions: HeapManager needs size of bucket array and bucket area needs sizeof HeapManager storage. |
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136 | // Break recusion by hardcoding number of buckets and statically checking number is correct after bucket array defined. |
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137 | enum { NoBucketSizes = 91 }; // number of buckets sizes |
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138 | |
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139 | struct HeapManager { |
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140 | struct Storage { |
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141 | struct Header { // header |
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142 | union Kind { |
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143 | struct RealHeader { |
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144 | union { |
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145 | struct { // 4-byte word => 8-byte header, 8-byte word => 16-byte header |
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146 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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147 | uint64_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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148 | #endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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149 | |
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150 | union { |
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151 | // FreeHeader * home; // allocated block points back to home locations (must overlay alignment) |
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152 | // 2nd low-order bit => zero filled |
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153 | void * home; // allocated block points back to home locations (must overlay alignment) |
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154 | size_t blockSize; // size for munmap (must overlay alignment) |
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155 | #if BUCKETLOCK == SPINLOCK |
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156 | Storage * next; // freed block points next freed block of same size |
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157 | #endif // SPINLOCK |
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158 | }; |
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159 | size_t size; // allocation size in bytes |
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160 | |
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161 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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162 | uint64_t padding; // unused, force home/blocksize to overlay alignment in fake header |
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163 | #endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_POINTER__ == 4 |
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164 | }; |
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165 | #if BUCKETLOCK == LOCKFREE |
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166 | Link(Storage) next; // freed block points next freed block of same size (double-wide) |
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167 | #endif // LOCKFREE |
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168 | }; |
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169 | } real; // RealHeader |
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170 | |
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171 | struct FakeHeader { |
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172 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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173 | uint32_t alignment; // 1st low-order bit => fake header & alignment |
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174 | #endif // __ORDER_LITTLE_ENDIAN__ |
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175 | |
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176 | uint32_t offset; |
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177 | |
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178 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
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179 | uint32_t alignment; // low-order bits of home/blockSize used for tricks |
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180 | #endif // __ORDER_BIG_ENDIAN__ |
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181 | } fake; // FakeHeader |
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182 | } kind; // Kind |
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183 | } header; // Header |
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184 | char pad[libAlign() - sizeof( Header )]; |
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185 | char data[0]; // storage |
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186 | }; // Storage |
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187 | |
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188 | static_assert( libAlign() >= sizeof( Storage ), "libAlign() < sizeof( Storage )" ); |
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189 | |
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190 | struct FreeHeader { |
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191 | #if BUCKETLOCK == SPINLOCK |
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192 | __spinlock_t lock; // must be first field for alignment |
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193 | Storage * freeList; |
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194 | #else |
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195 | StackLF(Storage) freeList; |
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196 | #endif // BUCKETLOCK |
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197 | size_t blockSize; // size of allocations on this list |
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198 | }; // FreeHeader |
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199 | |
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200 | // must be first fields for alignment |
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201 | __spinlock_t extlock; // protects allocation-buffer extension |
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202 | FreeHeader freeLists[NoBucketSizes]; // buckets for different allocation sizes |
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203 | |
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204 | void * heapBegin; // start of heap |
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205 | void * heapEnd; // logical end of heap |
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206 | size_t heapRemaining; // amount of storage not allocated in the current chunk |
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207 | }; // HeapManager |
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208 | |
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209 | #if BUCKETLOCK == LOCKFREE |
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210 | static inline { |
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211 | Link(HeapManager.Storage) * ?`next( HeapManager.Storage * this ) { return &this->header.kind.real.next; } |
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212 | void ?{}( HeapManager.FreeHeader & ) {} |
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213 | void ^?{}( HeapManager.FreeHeader & ) {} |
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214 | } // distribution |
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215 | #endif // LOCKFREE |
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216 | |
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217 | static inline size_t getKey( const HeapManager.FreeHeader & freeheader ) { return freeheader.blockSize; } |
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218 | |
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219 | |
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220 | #define FASTLOOKUP |
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221 | #define __STATISTICS__ |
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222 | |
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223 | // Size of array must harmonize with NoBucketSizes and individual bucket sizes must be multiple of 16. |
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224 | // Smaller multiples of 16 and powers of 2 are common allocation sizes, so make them generate the minimum required bucket size. |
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225 | // malloc(0) returns 0p, so no bucket is necessary for 0 bytes returning an address that can be freed. |
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226 | static const unsigned int bucketSizes[] @= { // different bucket sizes |
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227 | 16 + sizeof(HeapManager.Storage), 32 + sizeof(HeapManager.Storage), 48 + sizeof(HeapManager.Storage), 64 + sizeof(HeapManager.Storage), // 4 |
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228 | 96 + sizeof(HeapManager.Storage), 112 + sizeof(HeapManager.Storage), 128 + sizeof(HeapManager.Storage), // 3 |
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229 | 160, 192, 224, 256 + sizeof(HeapManager.Storage), // 4 |
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230 | 320, 384, 448, 512 + sizeof(HeapManager.Storage), // 4 |
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231 | 640, 768, 896, 1_024 + sizeof(HeapManager.Storage), // 4 |
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232 | 1_536, 2_048 + sizeof(HeapManager.Storage), // 2 |
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233 | 2_560, 3_072, 3_584, 4_096 + sizeof(HeapManager.Storage), // 4 |
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234 | 6_144, 8_192 + sizeof(HeapManager.Storage), // 2 |
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235 | 9_216, 10_240, 11_264, 12_288, 13_312, 14_336, 15_360, 16_384 + sizeof(HeapManager.Storage), // 8 |
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236 | 18_432, 20_480, 22_528, 24_576, 26_624, 28_672, 30_720, 32_768 + sizeof(HeapManager.Storage), // 8 |
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237 | 36_864, 40_960, 45_056, 49_152, 53_248, 57_344, 61_440, 65_536 + sizeof(HeapManager.Storage), // 8 |
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238 | 73_728, 81_920, 90_112, 98_304, 106_496, 114_688, 122_880, 131_072 + sizeof(HeapManager.Storage), // 8 |
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239 | 147_456, 163_840, 180_224, 196_608, 212_992, 229_376, 245_760, 262_144 + sizeof(HeapManager.Storage), // 8 |
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240 | 294_912, 327_680, 360_448, 393_216, 425_984, 458_752, 491_520, 524_288 + sizeof(HeapManager.Storage), // 8 |
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241 | 655_360, 786_432, 917_504, 1_048_576 + sizeof(HeapManager.Storage), // 4 |
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242 | 1_179_648, 1_310_720, 1_441_792, 1_572_864, 1_703_936, 1_835_008, 1_966_080, 2_097_152 + sizeof(HeapManager.Storage), // 8 |
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243 | 2_621_440, 3_145_728, 3_670_016, 4_194_304 + sizeof(HeapManager.Storage), // 4 |
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244 | }; |
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245 | |
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246 | static_assert( NoBucketSizes == sizeof(bucketSizes) / sizeof(bucketSizes[0] ), "size of bucket array wrong" ); |
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247 | |
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248 | #ifdef FASTLOOKUP |
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249 | enum { LookupSizes = 65_536 + sizeof(HeapManager.Storage) }; // number of fast lookup sizes |
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250 | static unsigned char lookup[LookupSizes]; // O(1) lookup for small sizes |
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251 | #endif // FASTLOOKUP |
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252 | |
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253 | static const off_t mmapFd = -1; // fake or actual fd for anonymous file |
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254 | #ifdef __CFA_DEBUG__ |
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255 | static bool heapBoot = 0; // detect recursion during boot |
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256 | #endif // __CFA_DEBUG__ |
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257 | |
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258 | // The constructor for heapManager is called explicitly in memory_startup. |
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259 | static HeapManager heapManager __attribute__(( aligned (128) )) @= {}; // size of cache line to prevent false sharing |
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260 | |
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261 | |
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262 | #ifdef __STATISTICS__ |
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263 | // Heap statistics counters. |
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264 | static unsigned int malloc_zero_calls, malloc_calls; |
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265 | static unsigned long long int malloc_storage; |
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266 | static unsigned int aalloc_zero_calls, aalloc_calls; |
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267 | static unsigned long long int aalloc_storage; |
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268 | static unsigned int calloc_zero_calls, calloc_calls; |
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269 | static unsigned long long int calloc_storage; |
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270 | static unsigned int memalign_zero_calls, memalign_calls; |
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271 | static unsigned long long int memalign_storage; |
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272 | static unsigned int amemalign_zero_calls, amemalign_calls; |
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273 | static unsigned long long int amemalign_storage; |
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274 | static unsigned int cmemalign_zero_calls, cmemalign_calls; |
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275 | static unsigned long long int cmemalign_storage; |
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276 | static unsigned int resize_zero_calls, resize_calls; |
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277 | static unsigned long long int resize_storage; |
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278 | static unsigned int realloc_zero_calls, realloc_calls; |
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279 | static unsigned long long int realloc_storage; |
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280 | static unsigned int free_zero_calls, free_calls; |
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281 | static unsigned long long int free_storage; |
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282 | static unsigned int mmap_calls; |
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283 | static unsigned long long int mmap_storage; |
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284 | static unsigned int munmap_calls; |
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285 | static unsigned long long int munmap_storage; |
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286 | static unsigned int sbrk_calls; |
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287 | static unsigned long long int sbrk_storage; |
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288 | // Statistics file descriptor (changed by malloc_stats_fd). |
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289 | static int stats_fd = STDERR_FILENO; // default stderr |
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290 | |
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291 | // Use "write" because streams may be shutdown when calls are made. |
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292 | static void printStats() { |
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293 | char helpText[1024]; |
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294 | __cfaabi_bits_print_buffer( STDERR_FILENO, helpText, sizeof(helpText), |
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295 | "\nHeap statistics:\n" |
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296 | " malloc 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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297 | " aalloc 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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298 | " calloc 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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299 | " memalign 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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300 | " amemalign 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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301 | " cmemalign 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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302 | " resize 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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303 | " realloc 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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304 | " free 0-calls %'u; >0-calls %'u; storage %'llu bytes\n" |
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305 | " mmap calls %'u; storage %'llu bytes\n" |
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306 | " munmap calls %'u; storage %'llu bytes\n" |
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307 | " sbrk calls %'u; storage %'llu bytes\n", |
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308 | malloc_zero_calls, malloc_calls, malloc_storage, |
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309 | aalloc_zero_calls, aalloc_calls, aalloc_storage, |
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310 | calloc_zero_calls, calloc_calls, calloc_storage, |
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311 | memalign_zero_calls, memalign_calls, memalign_storage, |
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312 | amemalign_zero_calls, amemalign_calls, amemalign_storage, |
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313 | cmemalign_zero_calls, cmemalign_calls, cmemalign_storage, |
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314 | resize_zero_calls, resize_calls, resize_storage, |
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315 | realloc_zero_calls, realloc_calls, realloc_storage, |
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316 | free_zero_calls, free_calls, free_storage, |
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317 | mmap_calls, mmap_storage, |
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318 | munmap_calls, munmap_storage, |
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319 | sbrk_calls, sbrk_storage |
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320 | ); |
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321 | } // printStats |
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322 | |
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323 | static int printStatsXML( FILE * stream ) { // see malloc_info |
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324 | char helpText[1024]; |
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325 | int len = snprintf( helpText, sizeof(helpText), |
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326 | "<malloc version=\"1\">\n" |
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327 | "<heap nr=\"0\">\n" |
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328 | "<sizes>\n" |
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329 | "</sizes>\n" |
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330 | "<total type=\"malloc\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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331 | "<total type=\"aalloc\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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332 | "<total type=\"calloc\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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333 | "<total type=\"memalign\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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334 | "<total type=\"amemalign\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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335 | "<total type=\"cmemalign\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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336 | "<total type=\"resize\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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337 | "<total type=\"realloc\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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338 | "<total type=\"free\" 0 count=\"%'u;\" >0 count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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339 | "<total type=\"mmap\" count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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340 | "<total type=\"munmap\" count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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341 | "<total type=\"sbrk\" count=\"%'u;\" size=\"%'llu\"/> bytes\n" |
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342 | "</malloc>", |
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343 | malloc_zero_calls, malloc_calls, malloc_storage, |
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344 | aalloc_zero_calls, aalloc_calls, aalloc_storage, |
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345 | calloc_zero_calls, calloc_calls, calloc_storage, |
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346 | memalign_zero_calls, memalign_calls, memalign_storage, |
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347 | amemalign_zero_calls, amemalign_calls, amemalign_storage, |
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348 | cmemalign_zero_calls, cmemalign_calls, cmemalign_storage, |
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349 | resize_zero_calls, resize_calls, resize_storage, |
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350 | realloc_zero_calls, realloc_calls, realloc_storage, |
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351 | free_zero_calls, free_calls, free_storage, |
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352 | mmap_calls, mmap_storage, |
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353 | munmap_calls, munmap_storage, |
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354 | sbrk_calls, sbrk_storage |
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355 | ); |
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356 | __cfaabi_bits_write( fileno( stream ), helpText, len ); // ensures all bytes written or exit |
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357 | return len; |
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358 | } // printStatsXML |
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359 | #endif // __STATISTICS__ |
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360 | |
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361 | |
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362 | // thunk problem |
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363 | size_t Bsearchl( unsigned int key, const unsigned int * vals, size_t dim ) { |
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364 | size_t l = 0, m, h = dim; |
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365 | while ( l < h ) { |
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366 | m = (l + h) / 2; |
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367 | if ( (unsigned int &)(vals[m]) < key ) { // cast away const |
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368 | l = m + 1; |
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369 | } else { |
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370 | h = m; |
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371 | } // if |
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372 | } // while |
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373 | return l; |
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374 | } // Bsearchl |
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375 | |
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376 | |
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377 | static inline bool setMmapStart( size_t value ) { // true => mmapped, false => sbrk |
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378 | if ( value < __page_size || bucketSizes[NoBucketSizes - 1] < value ) return false; |
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379 | mmapStart = value; // set global |
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380 | |
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381 | // find the closest bucket size less than or equal to the mmapStart size |
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382 | maxBucketsUsed = Bsearchl( (unsigned int)mmapStart, bucketSizes, NoBucketSizes ); // binary search |
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383 | assert( maxBucketsUsed < NoBucketSizes ); // subscript failure ? |
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384 | assert( mmapStart <= bucketSizes[maxBucketsUsed] ); // search failure ? |
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385 | return true; |
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386 | } // setMmapStart |
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387 | |
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388 | |
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389 | // <-------+----------------------------------------------------> bsize (bucket size) |
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390 | // |header |addr |
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391 | //================================================================================== |
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392 | // align/offset | |
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393 | // <-----------------<------------+-----------------------------> bsize (bucket size) |
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394 | // |fake-header | addr |
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395 | #define headerAddr( addr ) ((HeapManager.Storage.Header *)( (char *)addr - sizeof(HeapManager.Storage) )) |
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396 | #define realHeader( header ) ((HeapManager.Storage.Header *)((char *)header - header->kind.fake.offset)) |
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397 | |
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398 | // <-------<<--------------------- dsize ---------------------->> bsize (bucket size) |
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399 | // |header |addr |
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400 | //================================================================================== |
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401 | // align/offset | |
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402 | // <------------------------------<<---------- dsize --------->>> bsize (bucket size) |
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403 | // |fake-header |addr |
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404 | #define dataStorage( bsize, addr, header ) (bsize - ( (char *)addr - (char *)header )) |
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405 | |
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406 | |
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407 | static inline void checkAlign( size_t alignment ) { |
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408 | if ( alignment < libAlign() || ! is_pow2( alignment ) ) { |
---|
409 | abort( "Alignment %zu for memory allocation is less than %d and/or not a power of 2.", alignment, libAlign() ); |
---|
410 | } // if |
---|
411 | } // checkAlign |
---|
412 | |
---|
413 | |
---|
414 | static inline void checkHeader( bool check, const char name[], void * addr ) { |
---|
415 | if ( unlikely( check ) ) { // bad address ? |
---|
416 | abort( "Attempt to %s storage %p with address outside the heap.\n" |
---|
417 | "Possible cause is duplicate free on same block or overwriting of memory.", |
---|
418 | name, addr ); |
---|
419 | } // if |
---|
420 | } // checkHeader |
---|
421 | |
---|
422 | |
---|
423 | static inline void fakeHeader( HeapManager.Storage.Header *& header, size_t & alignment ) { |
---|
424 | if ( unlikely( (header->kind.fake.alignment & 1) == 1 ) ) { // fake header ? |
---|
425 | alignment = header->kind.fake.alignment & -2; // remove flag from value |
---|
426 | #ifdef __CFA_DEBUG__ |
---|
427 | checkAlign( alignment ); // check alignment |
---|
428 | #endif // __CFA_DEBUG__ |
---|
429 | header = realHeader( header ); // backup from fake to real header |
---|
430 | } else { |
---|
431 | alignment = libAlign(); // => no fake header |
---|
432 | } // if |
---|
433 | } // fakeHeader |
---|
434 | |
---|
435 | |
---|
436 | static inline bool headers( const char name[] __attribute__(( unused )), void * addr, HeapManager.Storage.Header *& header, HeapManager.FreeHeader *& freeElem, |
---|
437 | size_t & size, size_t & alignment ) with( heapManager ) { |
---|
438 | header = headerAddr( addr ); |
---|
439 | |
---|
440 | if ( unlikely( addr < heapBegin || heapEnd < addr ) ) { // mmapped ? |
---|
441 | fakeHeader( header, alignment ); |
---|
442 | size = header->kind.real.blockSize & -3; // mmap size |
---|
443 | return true; |
---|
444 | } // if |
---|
445 | |
---|
446 | #ifdef __CFA_DEBUG__ |
---|
447 | checkHeader( header < (HeapManager.Storage.Header *)heapBegin, name, addr ); // bad low address ? |
---|
448 | #endif // __CFA_DEBUG__ |
---|
449 | |
---|
450 | // header may be safe to dereference |
---|
451 | fakeHeader( header, alignment ); |
---|
452 | #ifdef __CFA_DEBUG__ |
---|
453 | checkHeader( header < (HeapManager.Storage.Header *)heapBegin || (HeapManager.Storage.Header *)heapEnd < header, name, addr ); // bad address ? (offset could be + or -) |
---|
454 | #endif // __CFA_DEBUG__ |
---|
455 | |
---|
456 | freeElem = (HeapManager.FreeHeader *)((size_t)header->kind.real.home & -3); |
---|
457 | #ifdef __CFA_DEBUG__ |
---|
458 | if ( freeElem < &freeLists[0] || &freeLists[NoBucketSizes] <= freeElem ) { |
---|
459 | abort( "Attempt to %s storage %p with corrupted header.\n" |
---|
460 | "Possible cause is duplicate free on same block or overwriting of header information.", |
---|
461 | name, addr ); |
---|
462 | } // if |
---|
463 | #endif // __CFA_DEBUG__ |
---|
464 | size = freeElem->blockSize; |
---|
465 | return false; |
---|
466 | } // headers |
---|
467 | |
---|
468 | // #ifdef __CFA_DEBUG__ |
---|
469 | // #if __SIZEOF_POINTER__ == 4 |
---|
470 | // #define MASK 0xdeadbeef |
---|
471 | // #else |
---|
472 | // #define MASK 0xdeadbeefdeadbeef |
---|
473 | // #endif |
---|
474 | // #define STRIDE size_t |
---|
475 | |
---|
476 | // static void * Memset( void * addr, STRIDE size ) { // debug only |
---|
477 | // if ( size % sizeof(STRIDE) != 0 ) abort( "Memset() : internal error, size %zd not multiple of %zd.", size, sizeof(STRIDE) ); |
---|
478 | // if ( (STRIDE)addr % sizeof(STRIDE) != 0 ) abort( "Memset() : internal error, addr %p not multiple of %zd.", addr, sizeof(STRIDE) ); |
---|
479 | |
---|
480 | // STRIDE * end = (STRIDE *)addr + size / sizeof(STRIDE); |
---|
481 | // for ( STRIDE * p = (STRIDE *)addr; p < end; p += 1 ) *p = MASK; |
---|
482 | // return addr; |
---|
483 | // } // Memset |
---|
484 | // #endif // __CFA_DEBUG__ |
---|
485 | |
---|
486 | |
---|
487 | #define NO_MEMORY_MSG "insufficient heap memory available for allocating %zd new bytes." |
---|
488 | |
---|
489 | static inline void * extend( size_t size ) with( heapManager ) { |
---|
490 | lock( extlock __cfaabi_dbg_ctx2 ); |
---|
491 | ptrdiff_t rem = heapRemaining - size; |
---|
492 | if ( rem < 0 ) { |
---|
493 | // If the size requested is bigger than the current remaining storage, increase the size of the heap. |
---|
494 | |
---|
495 | size_t increase = ceiling2( size > heapExpand ? size : heapExpand, __page_size ); |
---|
496 | // Do not call abort or strerror( errno ) as they may call malloc. |
---|
497 | if ( sbrk( increase ) == (void *)-1 ) { // failed, no memory ? |
---|
498 | unlock( extlock ); |
---|
499 | __cfaabi_bits_print_nolock( STDERR_FILENO, NO_MEMORY_MSG, size ); |
---|
500 | _exit( EXIT_FAILURE ); // give up |
---|
501 | } // if |
---|
502 | // Make storage executable for thunks. |
---|
503 | if ( mprotect( (char *)heapEnd + heapRemaining, increase, __map_prot ) ) { |
---|
504 | unlock( extlock ); |
---|
505 | __cfaabi_bits_print_nolock( STDERR_FILENO, "extend() : internal error, mprotect failure, heapEnd:%p size:%zd, errno:%d.\n", heapEnd, increase, errno ); |
---|
506 | _exit( EXIT_FAILURE ); |
---|
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, '\xde', increase ); |
---|
515 | //Memset( (char *)heapEnd + heapRemaining, increase ); |
---|
516 | #endif // __CFA_DEBUG__ |
---|
517 | rem = heapRemaining + increase - size; |
---|
518 | } // if |
---|
519 | |
---|
520 | HeapManager.Storage * block = (HeapManager.Storage *)heapEnd; |
---|
521 | heapRemaining = rem; |
---|
522 | heapEnd = (char *)heapEnd + size; |
---|
523 | unlock( extlock ); |
---|
524 | return block; |
---|
525 | } // extend |
---|
526 | |
---|
527 | |
---|
528 | static inline void * doMalloc( size_t size ) with( heapManager ) { |
---|
529 | HeapManager.Storage * block; // pointer to new block of storage |
---|
530 | |
---|
531 | // Look up size in the size list. Make sure the user request includes space for the header that must be allocated |
---|
532 | // along with the block and is a multiple of the alignment size. |
---|
533 | |
---|
534 | if ( unlikely( size > ULONG_MAX - sizeof(HeapManager.Storage) ) ) return 0p; |
---|
535 | size_t tsize = size + sizeof(HeapManager.Storage); |
---|
536 | if ( likely( tsize < mmapStart ) ) { // small size => sbrk |
---|
537 | size_t posn; |
---|
538 | #ifdef FASTLOOKUP |
---|
539 | if ( tsize < LookupSizes ) posn = lookup[tsize]; |
---|
540 | else |
---|
541 | #endif // FASTLOOKUP |
---|
542 | posn = Bsearchl( (unsigned int)tsize, bucketSizes, (size_t)maxBucketsUsed ); |
---|
543 | HeapManager.FreeHeader * freeElem = &freeLists[posn]; |
---|
544 | verify( freeElem <= &freeLists[maxBucketsUsed] ); // subscripting error ? |
---|
545 | verify( tsize <= freeElem->blockSize ); // search failure ? |
---|
546 | tsize = freeElem->blockSize; // total space needed for request |
---|
547 | |
---|
548 | // Spin until the lock is acquired for this particular size of block. |
---|
549 | |
---|
550 | #if BUCKETLOCK == SPINLOCK |
---|
551 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); |
---|
552 | block = freeElem->freeList; // remove node from stack |
---|
553 | #else |
---|
554 | block = pop( freeElem->freeList ); |
---|
555 | #endif // BUCKETLOCK |
---|
556 | if ( unlikely( block == 0p ) ) { // no free block ? |
---|
557 | #if BUCKETLOCK == SPINLOCK |
---|
558 | unlock( freeElem->lock ); |
---|
559 | #endif // BUCKETLOCK |
---|
560 | |
---|
561 | // Freelist for that size was empty, so carve it out of the heap if there's enough left, or get some more |
---|
562 | // and then carve it off. |
---|
563 | |
---|
564 | block = (HeapManager.Storage *)extend( tsize ); // mutual exclusion on call |
---|
565 | #if BUCKETLOCK == SPINLOCK |
---|
566 | } else { |
---|
567 | freeElem->freeList = block->header.kind.real.next; |
---|
568 | unlock( freeElem->lock ); |
---|
569 | #endif // BUCKETLOCK |
---|
570 | } // if |
---|
571 | |
---|
572 | block->header.kind.real.home = freeElem; // pointer back to free list of apropriate size |
---|
573 | } else { // large size => mmap |
---|
574 | if ( unlikely( size > ULONG_MAX - __page_size ) ) return 0p; |
---|
575 | tsize = ceiling2( tsize, __page_size ); // must be multiple of page size |
---|
576 | #ifdef __STATISTICS__ |
---|
577 | __atomic_add_fetch( &mmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
578 | __atomic_add_fetch( &mmap_storage, tsize, __ATOMIC_SEQ_CST ); |
---|
579 | #endif // __STATISTICS__ |
---|
580 | |
---|
581 | block = (HeapManager.Storage *)mmap( 0, tsize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, mmapFd, 0 ); |
---|
582 | if ( block == (HeapManager.Storage *)MAP_FAILED ) { // failed ? |
---|
583 | if ( errno == ENOMEM ) abort( NO_MEMORY_MSG, tsize ); // no memory |
---|
584 | // Do not call strerror( errno ) as it may call malloc. |
---|
585 | abort( "(HeapManager &)0x%p.doMalloc() : internal error, mmap failure, size:%zu errno:%d.", &heapManager, tsize, errno ); |
---|
586 | } //if |
---|
587 | #ifdef __CFA_DEBUG__ |
---|
588 | // Set new memory to garbage so subsequent uninitialized usages might fail. |
---|
589 | memset( block, '\xde', tsize ); |
---|
590 | //Memset( block, tsize ); |
---|
591 | #endif // __CFA_DEBUG__ |
---|
592 | block->header.kind.real.blockSize = tsize; // storage size for munmap |
---|
593 | } // if |
---|
594 | |
---|
595 | block->header.kind.real.size = size; // store allocation size |
---|
596 | void * addr = &(block->data); // adjust off header to user bytes |
---|
597 | verify( ((uintptr_t)addr & (libAlign() - 1)) == 0 ); // minimum alignment ? |
---|
598 | |
---|
599 | #ifdef __CFA_DEBUG__ |
---|
600 | __atomic_add_fetch( &allocUnfreed, tsize, __ATOMIC_SEQ_CST ); |
---|
601 | if ( traceHeap() ) { |
---|
602 | enum { BufferSize = 64 }; |
---|
603 | char helpText[BufferSize]; |
---|
604 | int len = snprintf( helpText, BufferSize, "%p = Malloc( %zu ) (allocated %zu)\n", addr, size, tsize ); |
---|
605 | __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug |
---|
606 | } // if |
---|
607 | #endif // __CFA_DEBUG__ |
---|
608 | |
---|
609 | return addr; |
---|
610 | } // doMalloc |
---|
611 | |
---|
612 | |
---|
613 | static inline void doFree( void * addr ) with( heapManager ) { |
---|
614 | #ifdef __CFA_DEBUG__ |
---|
615 | if ( unlikely( heapManager.heapBegin == 0p ) ) { |
---|
616 | abort( "doFree( %p ) : internal error, called before heap is initialized.", addr ); |
---|
617 | } // if |
---|
618 | #endif // __CFA_DEBUG__ |
---|
619 | |
---|
620 | HeapManager.Storage.Header * header; |
---|
621 | HeapManager.FreeHeader * freeElem; |
---|
622 | size_t size, alignment; // not used (see realloc) |
---|
623 | |
---|
624 | if ( headers( "free", addr, header, freeElem, size, alignment ) ) { // mmapped ? |
---|
625 | #ifdef __STATISTICS__ |
---|
626 | __atomic_add_fetch( &munmap_calls, 1, __ATOMIC_SEQ_CST ); |
---|
627 | __atomic_add_fetch( &munmap_storage, size, __ATOMIC_SEQ_CST ); |
---|
628 | #endif // __STATISTICS__ |
---|
629 | if ( munmap( header, size ) == -1 ) { |
---|
630 | abort( "Attempt to deallocate storage %p not allocated or with corrupt header.\n" |
---|
631 | "Possible cause is invalid pointer.", |
---|
632 | addr ); |
---|
633 | } // if |
---|
634 | } else { |
---|
635 | #ifdef __CFA_DEBUG__ |
---|
636 | // Set free memory to garbage so subsequent usages might fail. |
---|
637 | memset( ((HeapManager.Storage *)header)->data, '\xde', freeElem->blockSize - sizeof( HeapManager.Storage ) ); |
---|
638 | //Memset( ((HeapManager.Storage *)header)->data, freeElem->blockSize - sizeof( HeapManager.Storage ) ); |
---|
639 | #endif // __CFA_DEBUG__ |
---|
640 | |
---|
641 | #ifdef __STATISTICS__ |
---|
642 | free_storage += size; |
---|
643 | #endif // __STATISTICS__ |
---|
644 | #if BUCKETLOCK == SPINLOCK |
---|
645 | lock( freeElem->lock __cfaabi_dbg_ctx2 ); // acquire spin lock |
---|
646 | header->kind.real.next = freeElem->freeList; // push on stack |
---|
647 | freeElem->freeList = (HeapManager.Storage *)header; |
---|
648 | unlock( freeElem->lock ); // release spin lock |
---|
649 | #else |
---|
650 | push( freeElem->freeList, *(HeapManager.Storage *)header ); |
---|
651 | #endif // BUCKETLOCK |
---|
652 | } // if |
---|
653 | |
---|
654 | #ifdef __CFA_DEBUG__ |
---|
655 | __atomic_add_fetch( &allocUnfreed, -size, __ATOMIC_SEQ_CST ); |
---|
656 | if ( traceHeap() ) { |
---|
657 | char helpText[64]; |
---|
658 | int len = snprintf( helpText, sizeof(helpText), "Free( %p ) size:%zu\n", addr, size ); |
---|
659 | __cfaabi_bits_write( STDERR_FILENO, helpText, len ); // print debug/nodebug |
---|
660 | } // if |
---|
661 | #endif // __CFA_DEBUG__ |
---|
662 | } // doFree |
---|
663 | |
---|
664 | |
---|
665 | size_t prtFree( HeapManager & manager ) with( manager ) { |
---|
666 | size_t total = 0; |
---|
667 | #ifdef __STATISTICS__ |
---|
668 | __cfaabi_bits_acquire(); |
---|
669 | __cfaabi_bits_print_nolock( STDERR_FILENO, "\nBin lists (bin size : free blocks on list)\n" ); |
---|
670 | #endif // __STATISTICS__ |
---|
671 | for ( unsigned int i = 0; i < maxBucketsUsed; i += 1 ) { |
---|
672 | size_t size = freeLists[i].blockSize; |
---|
673 | #ifdef __STATISTICS__ |
---|
674 | unsigned int N = 0; |
---|
675 | #endif // __STATISTICS__ |
---|
676 | |
---|
677 | #if BUCKETLOCK == SPINLOCK |
---|
678 | for ( HeapManager.Storage * p = freeLists[i].freeList; p != 0p; p = p->header.kind.real.next ) { |
---|
679 | #else |
---|
680 | for(;;) { |
---|
681 | // for ( HeapManager.Storage * p = top( freeLists[i].freeList ); p != 0p; p = (p)`next->top ) { |
---|
682 | // for ( HeapManager.Storage * p = top( freeLists[i].freeList ); p != 0p; /* p = getNext( p )->top */) { |
---|
683 | // HeapManager.Storage * temp = p->header.kind.real.next.top; // FIX ME: direct assignent fails, initialization works` |
---|
684 | // typeof(p) temp = (( p )`next)->top; // FIX ME: direct assignent fails, initialization works` |
---|
685 | // p = temp; |
---|
686 | #endif // BUCKETLOCK |
---|
687 | total += size; |
---|
688 | #ifdef __STATISTICS__ |
---|
689 | N += 1; |
---|
690 | #endif // __STATISTICS__ |
---|
691 | } // for |
---|
692 | |
---|
693 | #ifdef __STATISTICS__ |
---|
694 | __cfaabi_bits_print_nolock( STDERR_FILENO, "%7zu, %-7u ", size, N ); |
---|
695 | if ( (i + 1) % 8 == 0 ) __cfaabi_bits_print_nolock( STDERR_FILENO, "\n" ); |
---|
696 | #endif // __STATISTICS__ |
---|
697 | } // for |
---|
698 | #ifdef __STATISTICS__ |
---|
699 | __cfaabi_bits_print_nolock( STDERR_FILENO, "\ntotal free blocks:%zu\n", total ); |
---|
700 | __cfaabi_bits_release(); |
---|
701 | #endif // __STATISTICS__ |
---|
702 | return (char *)heapEnd - (char *)heapBegin - total; |
---|
703 | } // prtFree |
---|
704 | |
---|
705 | |
---|
706 | static void ?{}( HeapManager & manager ) with( manager ) { |
---|
707 | __page_size = sysconf( _SC_PAGESIZE ); |
---|
708 | __map_prot = PROT_READ | PROT_WRITE | PROT_EXEC; |
---|
709 | |
---|
710 | for ( unsigned int i = 0; i < NoBucketSizes; i += 1 ) { // initialize the free lists |
---|
711 | freeLists[i].blockSize = bucketSizes[i]; |
---|
712 | } // for |
---|
713 | |
---|
714 | #ifdef FASTLOOKUP |
---|
715 | unsigned int idx = 0; |
---|
716 | for ( unsigned int i = 0; i < LookupSizes; i += 1 ) { |
---|
717 | if ( i > bucketSizes[idx] ) idx += 1; |
---|
718 | lookup[i] = idx; |
---|
719 | } // for |
---|
720 | #endif // FASTLOOKUP |
---|
721 | |
---|
722 | if ( ! setMmapStart( default_mmap_start() ) ) { |
---|
723 | abort( "HeapManager : internal error, mmap start initialization failure." ); |
---|
724 | } // if |
---|
725 | heapExpand = default_heap_expansion(); |
---|
726 | |
---|
727 | char * end = (char *)sbrk( 0 ); |
---|
728 | heapBegin = heapEnd = sbrk( (char *)ceiling2( (long unsigned int)end, __page_size ) - end ); // move start of heap to multiple of alignment |
---|
729 | } // HeapManager |
---|
730 | |
---|
731 | |
---|
732 | static void ^?{}( HeapManager & ) { |
---|
733 | #ifdef __STATISTICS__ |
---|
734 | if ( traceHeapTerm() ) { |
---|
735 | printStats(); |
---|
736 | // prtUnfreed() called in heapAppStop() |
---|
737 | } // if |
---|
738 | #endif // __STATISTICS__ |
---|
739 | } // ~HeapManager |
---|
740 | |
---|
741 | |
---|
742 | static void memory_startup( void ) __attribute__(( constructor( STARTUP_PRIORITY_MEMORY ) )); |
---|
743 | void memory_startup( void ) { |
---|
744 | #ifdef __CFA_DEBUG__ |
---|
745 | if ( heapBoot ) { // check for recursion during system boot |
---|
746 | abort( "boot() : internal error, recursively invoked during system boot." ); |
---|
747 | } // if |
---|
748 | heapBoot = true; |
---|
749 | #endif // __CFA_DEBUG__ |
---|
750 | |
---|
751 | //verify( heapManager.heapBegin != 0 ); |
---|
752 | //heapManager{}; |
---|
753 | if ( heapManager.heapBegin == 0p ) heapManager{}; // sanity check |
---|
754 | } // memory_startup |
---|
755 | |
---|
756 | static void memory_shutdown( void ) __attribute__(( destructor( STARTUP_PRIORITY_MEMORY ) )); |
---|
757 | void memory_shutdown( void ) { |
---|
758 | ^heapManager{}; |
---|
759 | } // memory_shutdown |
---|
760 | |
---|
761 | |
---|
762 | static inline void * mallocNoStats( size_t size ) { // necessary for malloc statistics |
---|
763 | verify( heapManager.heapBegin != 0p ); // called before memory_startup ? |
---|
764 | if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER |
---|
765 | |
---|
766 | #if __SIZEOF_POINTER__ == 8 |
---|
767 | verify( size < ((typeof(size_t))1 << 48) ); |
---|
768 | #endif // __SIZEOF_POINTER__ == 8 |
---|
769 | return doMalloc( size ); |
---|
770 | } // mallocNoStats |
---|
771 | |
---|
772 | |
---|
773 | static inline void * memalignNoStats( size_t alignment, size_t size ) { |
---|
774 | if ( unlikely( size ) == 0 ) return 0p; // 0 BYTE ALLOCATION RETURNS NULL POINTER |
---|
775 | |
---|
776 | #ifdef __CFA_DEBUG__ |
---|
777 | checkAlign( alignment ); // check alignment |
---|
778 | #endif // __CFA_DEBUG__ |
---|
779 | |
---|
780 | // if alignment <= default alignment, do normal malloc as two headers are unnecessary |
---|
781 | if ( unlikely( alignment <= libAlign() ) ) return mallocNoStats( size ); |
---|
782 | |
---|
783 | // Allocate enough storage to guarantee an address on the alignment boundary, and sufficient space before it for |
---|
784 | // administrative storage. NOTE, WHILE THERE ARE 2 HEADERS, THE FIRST ONE IS IMPLICITLY CREATED BY DOMALLOC. |
---|
785 | // .-------------v-----------------v----------------v----------, |
---|
786 | // | Real Header | ... padding ... | Fake Header | data ... | |
---|
787 | // `-------------^-----------------^-+--------------^----------' |
---|
788 | // |<--------------------------------' offset/align |<-- alignment boundary |
---|
789 | |
---|
790 | // subtract libAlign() because it is already the minimum alignment |
---|
791 | // add sizeof(Storage) for fake header |
---|
792 | char * addr = (char *)mallocNoStats( size + alignment - libAlign() + sizeof(HeapManager.Storage) ); |
---|
793 | |
---|
794 | // address in the block of the "next" alignment address |
---|
795 | char * user = (char *)ceiling2( (uintptr_t)(addr + sizeof(HeapManager.Storage)), alignment ); |
---|
796 | |
---|
797 | // address of header from malloc |
---|
798 | HeapManager.Storage.Header * realHeader = headerAddr( addr ); |
---|
799 | realHeader->kind.real.size = size; // correct size to eliminate above alignment offset |
---|
800 | // address of fake header * before* the alignment location |
---|
801 | HeapManager.Storage.Header * fakeHeader = headerAddr( user ); |
---|
802 | // SKULLDUGGERY: insert the offset to the start of the actual storage block and remember alignment |
---|
803 | fakeHeader->kind.fake.offset = (char *)fakeHeader - (char *)realHeader; |
---|
804 | // SKULLDUGGERY: odd alignment imples fake header |
---|
805 | fakeHeader->kind.fake.alignment = alignment | 1; |
---|
806 | |
---|
807 | return user; |
---|
808 | } // memalignNoStats |
---|
809 | |
---|
810 | |
---|
811 | extern "C" { |
---|
812 | // Allocates size bytes and returns a pointer to the allocated memory. The contents are undefined. If size is 0, |
---|
813 | // then malloc() returns a unique pointer value that can later be successfully passed to free(). |
---|
814 | void * malloc( size_t size ) { |
---|
815 | #ifdef __STATISTICS__ |
---|
816 | if ( likely( size > 0 ) ) { |
---|
817 | __atomic_add_fetch( &malloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
818 | __atomic_add_fetch( &malloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
819 | } else { |
---|
820 | __atomic_add_fetch( &malloc_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
821 | } // if |
---|
822 | #endif // __STATISTICS__ |
---|
823 | |
---|
824 | return mallocNoStats( size ); |
---|
825 | } // malloc |
---|
826 | |
---|
827 | |
---|
828 | // Same as malloc() except size bytes is an array of dim elements each of elemSize bytes. |
---|
829 | void * aalloc( size_t dim, size_t elemSize ) { |
---|
830 | size_t size = dim * elemSize; |
---|
831 | #ifdef __STATISTICS__ |
---|
832 | if ( likely( size > 0 ) ) { |
---|
833 | __atomic_add_fetch( &aalloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
834 | __atomic_add_fetch( &aalloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
835 | } else { |
---|
836 | __atomic_add_fetch( &aalloc_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
837 | } // if |
---|
838 | #endif // __STATISTICS__ |
---|
839 | |
---|
840 | return mallocNoStats( size ); |
---|
841 | } // aalloc |
---|
842 | |
---|
843 | |
---|
844 | // Same as aalloc() with memory set to zero. |
---|
845 | void * calloc( size_t dim, size_t elemSize ) { |
---|
846 | size_t size = dim * elemSize; |
---|
847 | if ( unlikely( size ) == 0 ) { // 0 BYTE ALLOCATION RETURNS NULL POINTER |
---|
848 | #ifdef __STATISTICS__ |
---|
849 | __atomic_add_fetch( &calloc_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
850 | #endif // __STATISTICS__ |
---|
851 | return 0p; |
---|
852 | } // if |
---|
853 | #ifdef __STATISTICS__ |
---|
854 | __atomic_add_fetch( &calloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
855 | __atomic_add_fetch( &calloc_storage, dim * elemSize, __ATOMIC_SEQ_CST ); |
---|
856 | #endif // __STATISTICS__ |
---|
857 | |
---|
858 | char * addr = (char *)mallocNoStats( size ); |
---|
859 | |
---|
860 | HeapManager.Storage.Header * header; |
---|
861 | HeapManager.FreeHeader * freeElem; |
---|
862 | size_t bsize, alignment; |
---|
863 | |
---|
864 | #ifndef __CFA_DEBUG__ |
---|
865 | bool mapped = |
---|
866 | #endif // __CFA_DEBUG__ |
---|
867 | headers( "calloc", addr, header, freeElem, bsize, alignment ); |
---|
868 | |
---|
869 | #ifndef __CFA_DEBUG__ |
---|
870 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
871 | if ( ! mapped ) |
---|
872 | #endif // __CFA_DEBUG__ |
---|
873 | // <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined |
---|
874 | // `-header`-addr `-size |
---|
875 | memset( addr, '\0', size ); // set to zeros |
---|
876 | |
---|
877 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
878 | return addr; |
---|
879 | } // calloc |
---|
880 | |
---|
881 | |
---|
882 | // Change the size of the memory block pointed to by oaddr to size bytes. The contents are undefined. If oaddr is |
---|
883 | // 0p, then the call is equivalent to malloc(size), for all values of size; if size is equal to zero, and oaddr is |
---|
884 | // not 0p, then the call is equivalent to free(oaddr). Unless oaddr is 0p, it must have been returned by an earlier |
---|
885 | // call to malloc(), alloc(), calloc() or realloc(). If the area pointed to was moved, a free(oaddr) is done. |
---|
886 | void * resize( void * oaddr, size_t size ) { |
---|
887 | // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. |
---|
888 | if ( unlikely( size == 0 ) ) { // special cases |
---|
889 | #ifdef __STATISTICS__ |
---|
890 | __atomic_add_fetch( &resize_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
891 | #endif // __STATISTICS__ |
---|
892 | free( oaddr ); |
---|
893 | return 0p; |
---|
894 | } // if |
---|
895 | #ifdef __STATISTICS__ |
---|
896 | __atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST ); |
---|
897 | #endif // __STATISTICS__ |
---|
898 | |
---|
899 | if ( unlikely( oaddr == 0p ) ) { |
---|
900 | #ifdef __STATISTICS__ |
---|
901 | __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); |
---|
902 | #endif // __STATISTICS__ |
---|
903 | return mallocNoStats( size ); |
---|
904 | } // if |
---|
905 | |
---|
906 | HeapManager.Storage.Header * header; |
---|
907 | HeapManager.FreeHeader * freeElem; |
---|
908 | size_t bsize, oalign; |
---|
909 | headers( "resize", oaddr, header, freeElem, bsize, oalign ); |
---|
910 | |
---|
911 | size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket |
---|
912 | // same size, DO NOT preserve STICKY PROPERTIES. |
---|
913 | if ( oalign == libAlign() && size <= odsize && odsize <= size * 2 ) { // allow 50% wasted storage for smaller size |
---|
914 | header->kind.real.blockSize &= -2; // no alignment and turn off 0 fill |
---|
915 | header->kind.real.size = size; // reset allocation size |
---|
916 | return oaddr; |
---|
917 | } // if |
---|
918 | |
---|
919 | #ifdef __STATISTICS__ |
---|
920 | __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); |
---|
921 | #endif // __STATISTICS__ |
---|
922 | |
---|
923 | // change size, DO NOT preserve STICKY PROPERTIES. |
---|
924 | free( oaddr ); |
---|
925 | return mallocNoStats( size ); // create new area |
---|
926 | } // resize |
---|
927 | |
---|
928 | |
---|
929 | // Same as resize() but the contents are unchanged in the range from the start of the region up to the minimum of |
---|
930 | // the old and new sizes. |
---|
931 | void * realloc( void * oaddr, size_t size ) { |
---|
932 | // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. |
---|
933 | if ( unlikely( size == 0 ) ) { // special cases |
---|
934 | #ifdef __STATISTICS__ |
---|
935 | __atomic_add_fetch( &realloc_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
936 | #endif // __STATISTICS__ |
---|
937 | free( oaddr ); |
---|
938 | return 0p; |
---|
939 | } // if |
---|
940 | #ifdef __STATISTICS__ |
---|
941 | __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
942 | #endif // __STATISTICS__ |
---|
943 | |
---|
944 | if ( unlikely( oaddr == 0p ) ) { |
---|
945 | #ifdef __STATISTICS__ |
---|
946 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
947 | #endif // __STATISTICS__ |
---|
948 | return mallocNoStats( size ); |
---|
949 | } // if |
---|
950 | |
---|
951 | HeapManager.Storage.Header * header; |
---|
952 | HeapManager.FreeHeader * freeElem; |
---|
953 | size_t bsize, oalign; |
---|
954 | headers( "realloc", oaddr, header, freeElem, bsize, oalign ); |
---|
955 | |
---|
956 | size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket |
---|
957 | size_t osize = header->kind.real.size; // old allocation size |
---|
958 | bool ozfill = (header->kind.real.blockSize & 2); // old allocation zero filled |
---|
959 | if ( unlikely( size <= odsize ) && odsize <= size * 2 ) { // allow up to 50% wasted storage |
---|
960 | header->kind.real.size = size; // reset allocation size |
---|
961 | if ( unlikely( ozfill ) && size > osize ) { // previous request zero fill and larger ? |
---|
962 | memset( (char *)oaddr + osize, '\0', size - osize ); // initialize added storage |
---|
963 | } // if |
---|
964 | return oaddr; |
---|
965 | } // if |
---|
966 | |
---|
967 | #ifdef __STATISTICS__ |
---|
968 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
969 | #endif // __STATISTICS__ |
---|
970 | |
---|
971 | // change size and copy old content to new storage |
---|
972 | |
---|
973 | void * naddr; |
---|
974 | if ( likely( oalign == libAlign() ) ) { // previous request not aligned ? |
---|
975 | naddr = mallocNoStats( size ); // create new area |
---|
976 | } else { |
---|
977 | naddr = memalignNoStats( oalign, size ); // create new aligned area |
---|
978 | } // if |
---|
979 | |
---|
980 | headers( "realloc", naddr, header, freeElem, bsize, oalign ); |
---|
981 | memcpy( naddr, oaddr, min( osize, size ) ); // copy bytes |
---|
982 | free( oaddr ); |
---|
983 | |
---|
984 | if ( unlikely( ozfill ) ) { // previous request zero fill ? |
---|
985 | header->kind.real.blockSize |= 2; // mark new request as zero filled |
---|
986 | if ( size > osize ) { // previous request larger ? |
---|
987 | memset( (char *)naddr + osize, '\0', size - osize ); // initialize added storage |
---|
988 | } // if |
---|
989 | } // if |
---|
990 | return naddr; |
---|
991 | } // realloc |
---|
992 | |
---|
993 | |
---|
994 | // Same as malloc() except the memory address is a multiple of alignment, which must be a power of two. (obsolete) |
---|
995 | void * memalign( size_t alignment, size_t size ) { |
---|
996 | #ifdef __STATISTICS__ |
---|
997 | if ( likely( size > 0 ) ) { |
---|
998 | __atomic_add_fetch( &memalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
999 | __atomic_add_fetch( &memalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
1000 | } else { |
---|
1001 | __atomic_add_fetch( &memalign_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1002 | } // if |
---|
1003 | #endif // __STATISTICS__ |
---|
1004 | |
---|
1005 | return memalignNoStats( alignment, size ); |
---|
1006 | } // memalign |
---|
1007 | |
---|
1008 | |
---|
1009 | // Same as aalloc() with memory alignment. |
---|
1010 | void * amemalign( size_t alignment, size_t dim, size_t elemSize ) { |
---|
1011 | size_t size = dim * elemSize; |
---|
1012 | #ifdef __STATISTICS__ |
---|
1013 | if ( likely( size > 0 ) ) { |
---|
1014 | __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1015 | __atomic_add_fetch( &cmemalign_storage, size, __ATOMIC_SEQ_CST ); |
---|
1016 | } else { |
---|
1017 | __atomic_add_fetch( &cmemalign_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1018 | } // if |
---|
1019 | #endif // __STATISTICS__ |
---|
1020 | |
---|
1021 | return memalignNoStats( alignment, size ); |
---|
1022 | } // amemalign |
---|
1023 | |
---|
1024 | |
---|
1025 | // Same as calloc() with memory alignment. |
---|
1026 | void * cmemalign( size_t alignment, size_t dim, size_t elemSize ) { |
---|
1027 | size_t size = dim * elemSize; |
---|
1028 | if ( unlikely( size ) == 0 ) { // 0 BYTE ALLOCATION RETURNS NULL POINTER |
---|
1029 | #ifdef __STATISTICS__ |
---|
1030 | __atomic_add_fetch( &cmemalign_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1031 | #endif // __STATISTICS__ |
---|
1032 | return 0p; |
---|
1033 | } // if |
---|
1034 | #ifdef __STATISTICS__ |
---|
1035 | __atomic_add_fetch( &cmemalign_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1036 | __atomic_add_fetch( &cmemalign_storage, dim * elemSize, __ATOMIC_SEQ_CST ); |
---|
1037 | #endif // __STATISTICS__ |
---|
1038 | |
---|
1039 | char * addr = (char *)memalignNoStats( alignment, size ); |
---|
1040 | |
---|
1041 | HeapManager.Storage.Header * header; |
---|
1042 | HeapManager.FreeHeader * freeElem; |
---|
1043 | size_t bsize; |
---|
1044 | |
---|
1045 | #ifndef __CFA_DEBUG__ |
---|
1046 | bool mapped = |
---|
1047 | #endif // __CFA_DEBUG__ |
---|
1048 | headers( "cmemalign", addr, header, freeElem, bsize, alignment ); |
---|
1049 | |
---|
1050 | // Mapped storage is zero filled, but in debug mode mapped memory is scrubbed in doMalloc, so it has to be reset to zero. |
---|
1051 | #ifndef __CFA_DEBUG__ |
---|
1052 | if ( ! mapped ) |
---|
1053 | #endif // __CFA_DEBUG__ |
---|
1054 | // <-------0000000000000000000000000000UUUUUUUUUUUUUUUUUUUUUUUUU> bsize (bucket size) U => undefined |
---|
1055 | // `-header`-addr `-size |
---|
1056 | memset( addr, '\0', size ); // set to zeros |
---|
1057 | |
---|
1058 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
1059 | return addr; |
---|
1060 | } // cmemalign |
---|
1061 | |
---|
1062 | |
---|
1063 | // Same as memalign(), but ISO/IEC 2011 C11 Section 7.22.2 states: the value of size shall be an integral multiple |
---|
1064 | // of alignment. This requirement is universally ignored. |
---|
1065 | void * aligned_alloc( size_t alignment, size_t size ) { |
---|
1066 | return memalign( alignment, size ); |
---|
1067 | } // aligned_alloc |
---|
1068 | |
---|
1069 | |
---|
1070 | // Allocates size bytes and places the address of the allocated memory in *memptr. The address of the allocated |
---|
1071 | // memory shall be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). If size |
---|
1072 | // is 0, then posix_memalign() returns either 0p, or a unique pointer value that can later be successfully passed to |
---|
1073 | // free(3). |
---|
1074 | int posix_memalign( void ** memptr, size_t alignment, size_t size ) { |
---|
1075 | if ( alignment < libAlign() || ! is_pow2( alignment ) ) return EINVAL; // check alignment |
---|
1076 | * memptr = memalign( alignment, size ); |
---|
1077 | return 0; |
---|
1078 | } // posix_memalign |
---|
1079 | |
---|
1080 | |
---|
1081 | // Allocates size bytes and returns a pointer to the allocated memory. The memory address shall be a multiple of the |
---|
1082 | // page size. It is equivalent to memalign(sysconf(_SC_PAGESIZE),size). |
---|
1083 | void * valloc( size_t size ) { |
---|
1084 | return memalign( __page_size, size ); |
---|
1085 | } // valloc |
---|
1086 | |
---|
1087 | |
---|
1088 | // Same as valloc but rounds size to multiple of page size. |
---|
1089 | void * pvalloc( size_t size ) { |
---|
1090 | return memalign( __page_size, ceiling2( size, __page_size ) ); |
---|
1091 | } // pvalloc |
---|
1092 | |
---|
1093 | |
---|
1094 | // Frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc() |
---|
1095 | // or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behaviour occurs. If ptr is |
---|
1096 | // 0p, no operation is performed. |
---|
1097 | void free( void * addr ) { |
---|
1098 | if ( unlikely( addr == 0p ) ) { // special case |
---|
1099 | #ifdef __STATISTICS__ |
---|
1100 | __atomic_add_fetch( &free_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1101 | #endif // __STATISTICS__ |
---|
1102 | |
---|
1103 | // #ifdef __CFA_DEBUG__ |
---|
1104 | // if ( traceHeap() ) { |
---|
1105 | // #define nullmsg "Free( 0x0 ) size:0\n" |
---|
1106 | // // Do not debug print free( 0p ), as it can cause recursive entry from sprintf. |
---|
1107 | // __cfaabi_dbg_write( nullmsg, sizeof(nullmsg) - 1 ); |
---|
1108 | // } // if |
---|
1109 | // #endif // __CFA_DEBUG__ |
---|
1110 | return; |
---|
1111 | } // exit |
---|
1112 | |
---|
1113 | doFree( addr ); |
---|
1114 | } // free |
---|
1115 | |
---|
1116 | |
---|
1117 | // Returns the alignment of an allocation. |
---|
1118 | size_t malloc_alignment( void * addr ) { |
---|
1119 | if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment |
---|
1120 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1121 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1122 | return header->kind.fake.alignment & -2; // remove flag from value |
---|
1123 | } else { |
---|
1124 | return libAlign(); // minimum alignment |
---|
1125 | } // if |
---|
1126 | } // malloc_alignment |
---|
1127 | |
---|
1128 | |
---|
1129 | // Set the alignment for an the allocation and return previous alignment or 0 if no alignment. |
---|
1130 | size_t malloc_alignment_set$( void * addr, size_t alignment ) { |
---|
1131 | if ( unlikely( addr == 0p ) ) return libAlign(); // minimum alignment |
---|
1132 | size_t ret; |
---|
1133 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1134 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1135 | ret = header->kind.fake.alignment & -2; // remove flag from old value |
---|
1136 | header->kind.fake.alignment = alignment | 1; // add flag to new value |
---|
1137 | } else { |
---|
1138 | ret = 0; // => no alignment to change |
---|
1139 | } // if |
---|
1140 | return ret; |
---|
1141 | } // malloc_alignment_set$ |
---|
1142 | |
---|
1143 | |
---|
1144 | // Returns true if the allocation is zero filled, e.g., allocated by calloc(). |
---|
1145 | bool malloc_zero_fill( void * addr ) { |
---|
1146 | if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill |
---|
1147 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1148 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1149 | header = realHeader( header ); // backup from fake to real header |
---|
1150 | } // if |
---|
1151 | return (header->kind.real.blockSize & 2) != 0; // zero filled ? |
---|
1152 | } // malloc_zero_fill |
---|
1153 | |
---|
1154 | // Set allocation is zero filled and return previous zero filled. |
---|
1155 | bool malloc_zero_fill_set$( void * addr ) { |
---|
1156 | if ( unlikely( addr == 0p ) ) return false; // null allocation is not zero fill |
---|
1157 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1158 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1159 | header = realHeader( header ); // backup from fake to real header |
---|
1160 | } // if |
---|
1161 | bool ret = (header->kind.real.blockSize & 2) != 0; // zero filled ? |
---|
1162 | header->kind.real.blockSize |= 2; // mark as zero filled |
---|
1163 | return ret; |
---|
1164 | } // malloc_zero_fill_set$ |
---|
1165 | |
---|
1166 | |
---|
1167 | // Returns original total allocation size (not bucket size) => array size is dimension * sizeif(T). |
---|
1168 | size_t malloc_size( void * addr ) { |
---|
1169 | if ( unlikely( addr == 0p ) ) return 0; // null allocation has zero size |
---|
1170 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1171 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1172 | header = realHeader( header ); // backup from fake to real header |
---|
1173 | } // if |
---|
1174 | return header->kind.real.size; |
---|
1175 | } // malloc_size |
---|
1176 | |
---|
1177 | // Set allocation size and return previous size. |
---|
1178 | size_t malloc_size_set$( void * addr, size_t size ) { |
---|
1179 | if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size |
---|
1180 | HeapManager.Storage.Header * header = headerAddr( addr ); |
---|
1181 | if ( (header->kind.fake.alignment & 1) == 1 ) { // fake header ? |
---|
1182 | header = realHeader( header ); // backup from fake to real header |
---|
1183 | } // if |
---|
1184 | size_t ret = header->kind.real.size; |
---|
1185 | header->kind.real.size = size; |
---|
1186 | return ret; |
---|
1187 | } // malloc_size_set$ |
---|
1188 | |
---|
1189 | |
---|
1190 | // Returns the number of usable bytes in the block pointed to by ptr, a pointer to a block of memory allocated by |
---|
1191 | // malloc or a related function. |
---|
1192 | size_t malloc_usable_size( void * addr ) { |
---|
1193 | if ( unlikely( addr == 0p ) ) return 0; // null allocation has 0 size |
---|
1194 | HeapManager.Storage.Header * header; |
---|
1195 | HeapManager.FreeHeader * freeElem; |
---|
1196 | size_t bsize, alignment; |
---|
1197 | |
---|
1198 | headers( "malloc_usable_size", addr, header, freeElem, bsize, alignment ); |
---|
1199 | return dataStorage( bsize, addr, header ); // data storage in bucket |
---|
1200 | } // malloc_usable_size |
---|
1201 | |
---|
1202 | |
---|
1203 | // Prints (on default standard error) statistics about memory allocated by malloc and related functions. |
---|
1204 | void malloc_stats( void ) { |
---|
1205 | #ifdef __STATISTICS__ |
---|
1206 | printStats(); |
---|
1207 | if ( prtFree() ) prtFree( heapManager ); |
---|
1208 | #endif // __STATISTICS__ |
---|
1209 | } // malloc_stats |
---|
1210 | |
---|
1211 | |
---|
1212 | // Changes the file descripter where malloc_stats() writes statistics. |
---|
1213 | int malloc_stats_fd( int fd __attribute__(( unused )) ) { |
---|
1214 | #ifdef __STATISTICS__ |
---|
1215 | int temp = stats_fd; |
---|
1216 | stats_fd = fd; |
---|
1217 | return temp; |
---|
1218 | #else |
---|
1219 | return -1; |
---|
1220 | #endif // __STATISTICS__ |
---|
1221 | } // malloc_stats_fd |
---|
1222 | |
---|
1223 | |
---|
1224 | // Adjusts parameters that control the behaviour of the memory-allocation functions (see malloc). The param argument |
---|
1225 | // specifies the parameter to be modified, and value specifies the new value for that parameter. |
---|
1226 | int mallopt( int option, int value ) { |
---|
1227 | choose( option ) { |
---|
1228 | case M_TOP_PAD: |
---|
1229 | heapExpand = ceiling2( value, __page_size ); return 1; |
---|
1230 | case M_MMAP_THRESHOLD: |
---|
1231 | if ( setMmapStart( value ) ) return 1; |
---|
1232 | break; |
---|
1233 | } // switch |
---|
1234 | return 0; // error, unsupported |
---|
1235 | } // mallopt |
---|
1236 | |
---|
1237 | |
---|
1238 | // Attempt to release free memory at the top of the heap (by calling sbrk with a suitable argument). |
---|
1239 | int malloc_trim( size_t ) { |
---|
1240 | return 0; // => impossible to release memory |
---|
1241 | } // malloc_trim |
---|
1242 | |
---|
1243 | |
---|
1244 | // Exports an XML string that describes the current state of the memory-allocation implementation in the caller. |
---|
1245 | // The string is printed on the file stream stream. The exported string includes information about all arenas (see |
---|
1246 | // malloc). |
---|
1247 | int malloc_info( int options, FILE * stream __attribute__(( unused )) ) { |
---|
1248 | if ( options != 0 ) { errno = EINVAL; return -1; } |
---|
1249 | #ifdef __STATISTICS__ |
---|
1250 | return printStatsXML( stream ); |
---|
1251 | #else |
---|
1252 | return 0; // unsupported |
---|
1253 | #endif // __STATISTICS__ |
---|
1254 | } // malloc_info |
---|
1255 | |
---|
1256 | |
---|
1257 | // Records the current state of all malloc internal bookkeeping variables (but not the actual contents of the heap |
---|
1258 | // or the state of malloc_hook functions pointers). The state is recorded in a system-dependent opaque data |
---|
1259 | // structure dynamically allocated via malloc, and a pointer to that data structure is returned as the function |
---|
1260 | // result. (The caller must free this memory.) |
---|
1261 | void * malloc_get_state( void ) { |
---|
1262 | return 0p; // unsupported |
---|
1263 | } // malloc_get_state |
---|
1264 | |
---|
1265 | |
---|
1266 | // Restores the state of all malloc internal bookkeeping variables to the values recorded in the opaque data |
---|
1267 | // structure pointed to by state. |
---|
1268 | int malloc_set_state( void * ) { |
---|
1269 | return 0; // unsupported |
---|
1270 | } // malloc_set_state |
---|
1271 | } // extern "C" |
---|
1272 | |
---|
1273 | |
---|
1274 | // Must have CFA linkage to overload with C linkage realloc. |
---|
1275 | void * resize( void * oaddr, size_t nalign, size_t size ) { |
---|
1276 | // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. |
---|
1277 | if ( unlikely( size == 0 ) ) { // special cases |
---|
1278 | #ifdef __STATISTICS__ |
---|
1279 | __atomic_add_fetch( &resize_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1280 | #endif // __STATISTICS__ |
---|
1281 | free( oaddr ); |
---|
1282 | return 0p; |
---|
1283 | } // if |
---|
1284 | |
---|
1285 | if ( unlikely( nalign < libAlign() ) ) nalign = libAlign(); // reset alignment to minimum |
---|
1286 | #ifdef __CFA_DEBUG__ |
---|
1287 | else checkAlign( nalign ); // check alignment |
---|
1288 | #endif // __CFA_DEBUG__ |
---|
1289 | |
---|
1290 | if ( unlikely( oaddr == 0p ) ) { |
---|
1291 | #ifdef __STATISTICS__ |
---|
1292 | __atomic_add_fetch( &resize_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1293 | __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); |
---|
1294 | #endif // __STATISTICS__ |
---|
1295 | return memalignNoStats( nalign, size ); |
---|
1296 | } // if |
---|
1297 | |
---|
1298 | // Attempt to reuse existing alignment. |
---|
1299 | HeapManager.Storage.Header * header = headerAddr( oaddr ); |
---|
1300 | bool isFakeHeader = header->kind.fake.alignment & 1; // old fake header ? |
---|
1301 | size_t oalign; |
---|
1302 | if ( isFakeHeader ) { |
---|
1303 | oalign = header->kind.fake.alignment & -2; // old alignment |
---|
1304 | if ( (uintptr_t)oaddr % nalign == 0 // lucky match ? |
---|
1305 | && ( oalign <= nalign // going down |
---|
1306 | || (oalign >= nalign && oalign <= 256) ) // little alignment storage wasted ? |
---|
1307 | ) { |
---|
1308 | headerAddr( oaddr )->kind.fake.alignment = nalign | 1; // update alignment (could be the same) |
---|
1309 | HeapManager.FreeHeader * freeElem; |
---|
1310 | size_t bsize, oalign; |
---|
1311 | headers( "resize", oaddr, header, freeElem, bsize, oalign ); |
---|
1312 | size_t odsize = dataStorage( bsize, oaddr, header ); // data storage available in bucket |
---|
1313 | |
---|
1314 | if ( size <= odsize && odsize <= size * 2 ) { // allow 50% wasted data storage |
---|
1315 | headerAddr( oaddr )->kind.fake.alignment = nalign | 1; // update alignment (could be the same) |
---|
1316 | |
---|
1317 | header->kind.real.blockSize &= -2; // turn off 0 fill |
---|
1318 | header->kind.real.size = size; // reset allocation size |
---|
1319 | return oaddr; |
---|
1320 | } // if |
---|
1321 | } // if |
---|
1322 | } else if ( ! isFakeHeader // old real header (aligned on libAlign) ? |
---|
1323 | && nalign == libAlign() ) { // new alignment also on libAlign => no fake header needed |
---|
1324 | return resize( oaddr, size ); // duplicate special case checks |
---|
1325 | } // if |
---|
1326 | |
---|
1327 | #ifdef __STATISTICS__ |
---|
1328 | __atomic_add_fetch( &resize_storage, size, __ATOMIC_SEQ_CST ); |
---|
1329 | #endif // __STATISTICS__ |
---|
1330 | |
---|
1331 | // change size, DO NOT preserve STICKY PROPERTIES. |
---|
1332 | free( oaddr ); |
---|
1333 | return memalignNoStats( nalign, size ); // create new aligned area |
---|
1334 | } // resize |
---|
1335 | |
---|
1336 | |
---|
1337 | void * realloc( void * oaddr, size_t nalign, size_t size ) { |
---|
1338 | // If size is equal to 0, either NULL or a pointer suitable to be passed to free() is returned. |
---|
1339 | if ( unlikely( size == 0 ) ) { // special cases |
---|
1340 | #ifdef __STATISTICS__ |
---|
1341 | __atomic_add_fetch( &realloc_zero_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1342 | #endif // __STATISTICS__ |
---|
1343 | free( oaddr ); |
---|
1344 | return 0p; |
---|
1345 | } // if |
---|
1346 | |
---|
1347 | if ( unlikely( nalign < libAlign() ) ) nalign = libAlign(); // reset alignment to minimum |
---|
1348 | #ifdef __CFA_DEBUG__ |
---|
1349 | else checkAlign( nalign ); // check alignment |
---|
1350 | #endif // __CFA_DEBUG__ |
---|
1351 | |
---|
1352 | if ( unlikely( oaddr == 0p ) ) { |
---|
1353 | #ifdef __STATISTICS__ |
---|
1354 | __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1355 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
1356 | #endif // __STATISTICS__ |
---|
1357 | return memalignNoStats( nalign, size ); |
---|
1358 | } // if |
---|
1359 | |
---|
1360 | // Attempt to reuse existing alignment. |
---|
1361 | HeapManager.Storage.Header * header = headerAddr( oaddr ); |
---|
1362 | bool isFakeHeader = header->kind.fake.alignment & 1; // old fake header ? |
---|
1363 | size_t oalign; |
---|
1364 | if ( isFakeHeader ) { |
---|
1365 | oalign = header->kind.fake.alignment & -2; // old alignment |
---|
1366 | if ( (uintptr_t)oaddr % nalign == 0 // lucky match ? |
---|
1367 | && ( oalign <= nalign // going down |
---|
1368 | || (oalign >= nalign && oalign <= 256) ) // little alignment storage wasted ? |
---|
1369 | ) { |
---|
1370 | headerAddr( oaddr )->kind.fake.alignment = nalign | 1; // update alignment (could be the same) |
---|
1371 | return realloc( oaddr, size ); // duplicate alignment and special case checks |
---|
1372 | } // if |
---|
1373 | } else if ( ! isFakeHeader // old real header (aligned on libAlign) ? |
---|
1374 | && nalign == libAlign() ) // new alignment also on libAlign => no fake header needed |
---|
1375 | return realloc( oaddr, size ); // duplicate alignment and special case checks |
---|
1376 | |
---|
1377 | #ifdef __STATISTICS__ |
---|
1378 | __atomic_add_fetch( &realloc_calls, 1, __ATOMIC_SEQ_CST ); |
---|
1379 | __atomic_add_fetch( &realloc_storage, size, __ATOMIC_SEQ_CST ); |
---|
1380 | #endif // __STATISTICS__ |
---|
1381 | |
---|
1382 | HeapManager.FreeHeader * freeElem; |
---|
1383 | size_t bsize; |
---|
1384 | headers( "realloc", oaddr, header, freeElem, bsize, oalign ); |
---|
1385 | |
---|
1386 | // change size and copy old content to new storage |
---|
1387 | |
---|
1388 | size_t osize = header->kind.real.size; // old allocation size |
---|
1389 | bool ozfill = (header->kind.real.blockSize & 2); // old allocation zero filled |
---|
1390 | |
---|
1391 | void * naddr = memalignNoStats( nalign, size ); // create new aligned area |
---|
1392 | |
---|
1393 | headers( "realloc", naddr, header, freeElem, bsize, oalign ); |
---|
1394 | memcpy( naddr, oaddr, min( osize, size ) ); // copy bytes |
---|
1395 | free( oaddr ); |
---|
1396 | |
---|
1397 | if ( unlikely( ozfill ) ) { // previous request zero fill ? |
---|
1398 | header->kind.real.blockSize |= 2; // mark new request as zero filled |
---|
1399 | if ( size > osize ) { // previous request larger ? |
---|
1400 | memset( (char *)naddr + osize, '\0', size - osize ); // initialize added storage |
---|
1401 | } // if |
---|
1402 | } // if |
---|
1403 | return naddr; |
---|
1404 | } // realloc |
---|
1405 | |
---|
1406 | |
---|
1407 | // Local Variables: // |
---|
1408 | // tab-width: 4 // |
---|
1409 | // compile-command: "cfa -nodebug -O2 heap.cfa" // |
---|
1410 | // End: // |
---|