1 | #ifndef _GNU_SOURCE |
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2 | #define _GNU_SOURCE |
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3 | #endif |
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4 | |
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5 | #include <stdlib.h> |
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6 | #include <stdio.h> |
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7 | #include <limits.h> |
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8 | #include <string.h> |
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9 | |
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10 | #include <malloc.h> |
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11 | #include <execinfo.h> |
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12 | #include <sys/syscall.h> |
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13 | #include <sys/time.h> |
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14 | #include <sys/resource.h> |
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15 | #include <sys/types.h> |
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16 | #include <sys/stat.h> |
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17 | #include <sys/utsname.h> |
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18 | #include <fcntl.h> |
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19 | #include <unistd.h> |
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20 | |
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21 | #include <pthread.h> |
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22 | |
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23 | #include <dlfcn.h> |
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24 | |
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25 | FILE *log_file = NULL; |
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26 | static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER; |
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27 | |
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28 | // The malloc hook might use functions that call malloc, and we need to make |
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29 | // sure this does not cause an infinite loop. |
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30 | static __thread int in_malloc = 0; |
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31 | |
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32 | __attribute__((__constructor__)) |
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33 | static void record_init() { |
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34 | struct utsname u; |
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35 | uname(&u); |
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36 | |
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37 | char log_name[PATH_MAX]; |
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38 | snprintf(log_name, PATH_MAX, "%s.%d.memlog", u.nodename, getpid()); |
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39 | log_file = fopen(log_name, "w"); |
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40 | if (!log_file) |
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41 | fprintf(stderr, "fopen failed for '%s': %m\n", log_name); |
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42 | } |
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43 | |
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44 | __attribute__((__destructor__)) |
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45 | static void record_cleanup() { |
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46 | if (!log_file) |
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47 | return; |
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48 | |
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49 | // These functions might call free, but we're shutting down, so don't try to |
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50 | // unwind the stack from here... |
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51 | in_malloc = 1; |
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52 | |
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53 | (void) fflush(log_file); |
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54 | (void) fclose(log_file); |
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55 | } |
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56 | |
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57 | static void print_context(const void *caller) { |
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58 | struct rusage usage; |
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59 | if (getrusage(RUSAGE_SELF, &usage)) { |
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60 | fprintf(stderr, "getrusage failed: %m\n"); |
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61 | return; |
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62 | } |
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63 | |
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64 | fprintf(log_file, "\t%ld.%06ld %ld %ld", usage.ru_utime.tv_sec, |
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65 | usage.ru_utime.tv_usec, usage.ru_maxrss, syscall(SYS_gettid)); |
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66 | |
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67 | void *pcs[1024]; |
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68 | int num_pcs = backtrace(pcs, 1024); |
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69 | |
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70 | int found_caller = 0; |
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71 | caller = __builtin_extract_return_addr((void*) caller); |
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72 | for (int pci = 0; pci < num_pcs; ++pci) { |
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73 | intptr_t pc = (intptr_t) pcs[pci]; |
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74 | |
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75 | if (!pc) |
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76 | break; |
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77 | |
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78 | if (!found_caller) { |
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79 | if (pc != (intptr_t) caller) |
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80 | continue; |
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81 | |
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82 | found_caller = 1; |
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83 | } |
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84 | |
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85 | intptr_t off, relpc; |
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86 | const char *proc_name; |
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87 | const char *file_name; |
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88 | Dl_info dlinfo; |
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89 | if (dladdr((void *) pc, &dlinfo) && dlinfo.dli_fname && |
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90 | *dlinfo.dli_fname) { |
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91 | intptr_t saddr = (intptr_t) dlinfo.dli_saddr; |
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92 | if (saddr) { |
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93 | #if defined(__powerpc64__) && !defined(__powerpc64le__) |
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94 | // On PPC64 ELFv1, the symbol address points to the function descriptor, not |
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95 | // the actual starting address. |
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96 | saddr = *(intptr_t*) saddr; |
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97 | #endif |
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98 | |
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99 | off = pc - saddr; |
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100 | relpc = pc - ((intptr_t) dlinfo.dli_fbase); |
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101 | } else { |
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102 | off = 0; |
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103 | relpc = 0; |
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104 | } |
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105 | |
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106 | proc_name = dlinfo.dli_sname; |
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107 | if (!proc_name) |
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108 | proc_name = "?"; |
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109 | |
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110 | file_name = dlinfo.dli_fname; |
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111 | } else { |
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112 | off = pc; |
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113 | relpc = pc; |
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114 | proc_name = "?"; |
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115 | file_name = "?"; |
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116 | } |
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117 | |
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118 | fprintf(log_file, "\t%s (%s+0x%x) [0x%lx (0x%lx)]", file_name, proc_name, (int) off, |
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119 | (long) pc, (long) relpc); |
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120 | } |
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121 | } |
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122 | |
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123 | static void record_malloc(size_t size, void *ptr, const void *caller) { |
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124 | if (!log_file) |
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125 | return; |
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126 | |
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127 | if (pthread_mutex_lock(&log_mutex)) |
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128 | return; |
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129 | |
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130 | fprintf(log_file, "M: %zd %p", size, ptr); |
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131 | print_context(caller); |
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132 | fprintf(log_file, "\n"); |
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133 | |
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134 | done: |
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135 | pthread_mutex_unlock(&log_mutex); |
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136 | } |
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137 | |
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138 | static void record_free(void *ptr, const void *caller) { |
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139 | if (!log_file) |
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140 | return; |
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141 | |
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142 | if (pthread_mutex_lock(&log_mutex)) |
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143 | return; |
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144 | |
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145 | fprintf(log_file, "F: %p", ptr); |
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146 | print_context(caller); |
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147 | fprintf(log_file, "\n"); |
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148 | |
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149 | done: |
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150 | pthread_mutex_unlock(&log_mutex); |
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151 | } |
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152 | |
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153 | // glibc exports its underlying malloc implementation under the name |
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154 | // __libc_malloc so that hooks like this can use it. |
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155 | extern void *__libc_malloc(size_t size); |
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156 | extern void *__libc_realloc(void *ptr, size_t size); |
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157 | extern void *__libc_calloc(size_t nmemb, size_t size); |
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158 | extern void *__libc_memalign(size_t boundary, size_t size); |
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159 | extern void __libc_free(void *ptr); |
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160 | |
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161 | #ifdef __PIC__ |
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162 | #define FUNC(x) x |
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163 | #else |
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164 | #define FUNC(x) __wrap_ ## x |
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165 | #endif |
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166 | |
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167 | void *FUNC(malloc)(size_t size) { |
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168 | const void *caller = __builtin_return_address(0); |
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169 | |
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170 | if (in_malloc) |
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171 | return __libc_malloc(size); |
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172 | |
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173 | in_malloc = 1; |
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174 | |
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175 | void *ptr = __libc_malloc(size); |
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176 | |
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177 | record_malloc(size, ptr, caller); |
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178 | |
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179 | in_malloc = 0; |
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180 | return ptr; |
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181 | } |
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182 | |
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183 | void *FUNC(realloc)(void *ptr, size_t size) { |
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184 | const void *caller = __builtin_return_address(0); |
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185 | |
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186 | if (in_malloc) |
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187 | return __libc_realloc(ptr, size); |
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188 | |
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189 | in_malloc = 1; |
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190 | |
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191 | void *nptr = __libc_realloc(ptr, size); |
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192 | |
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193 | if (ptr) |
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194 | record_free(ptr, caller); |
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195 | record_malloc(size, nptr, caller); |
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196 | |
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197 | in_malloc = 0; |
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198 | |
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199 | return nptr; |
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200 | } |
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201 | |
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202 | void *FUNC(calloc)(size_t nmemb, size_t size) { |
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203 | const void *caller = __builtin_return_address(0); |
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204 | |
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205 | if (in_malloc) |
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206 | return __libc_calloc(nmemb, size); |
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207 | |
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208 | in_malloc = 1; |
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209 | |
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210 | void *ptr = __libc_calloc(nmemb, size); |
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211 | |
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212 | record_malloc(nmemb*size, ptr, caller); |
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213 | |
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214 | in_malloc = 0; |
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215 | |
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216 | return ptr; |
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217 | } |
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218 | |
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219 | void *FUNC(memalign)(size_t boundary, size_t size) { |
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220 | const void *caller = __builtin_return_address(0); |
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221 | |
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222 | if (in_malloc) |
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223 | return __libc_memalign(boundary, size); |
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224 | |
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225 | in_malloc = 1; |
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226 | |
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227 | void *ptr = __libc_memalign(boundary, size); |
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228 | |
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229 | record_malloc(size, ptr, caller); |
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230 | |
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231 | in_malloc = 0; |
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232 | |
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233 | return ptr; |
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234 | } |
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235 | |
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236 | void FUNC(free)(void *ptr) { |
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237 | const void *caller = __builtin_return_address(0); |
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238 | |
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239 | if (in_malloc || !ptr) |
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240 | return __libc_free(ptr); |
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241 | |
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242 | in_malloc = 1; |
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243 | |
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244 | record_free(ptr, caller); |
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245 | |
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246 | __libc_free(ptr); |
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247 | |
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248 | in_malloc = 0; |
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249 | } |
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250 | |
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