The Tor Browser: tools/profiler/shared-libraries-linux.cc@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "shared-libraries.h"

     7 #define PATH_MAX_TOSTRING(x) #x

     8 #define PATH_MAX_STRING(x) PATH_MAX_TOSTRING(x)

     9 #include <stdlib.h>

    10 #include <stdio.h>

    11 #include <string.h>

    12 #include <limits.h>

    13 #include <unistd.h>

    14 #include <fstream>

    15 #include "platform.h"

    16 #include "shared-libraries.h"

    18 #if !defined(MOZ_WIDGET_GONK)

    19 // TODO fix me with proper include

    20 #include "nsDebug.h"

    21 #ifdef ANDROID

    22 #include "ElfLoader.h" // dl_phdr_info

    23 #else

    24 #include <link.h> // dl_phdr_info

    25 #endif

    26 #include <features.h>

    27 #include <dlfcn.h>

    28 #include <sys/types.h>

    30 #ifdef ANDROID

    31 extern "C" __attribute__((weak))

    32 int dl_iterate_phdr(

    33           int (*callback) (struct dl_phdr_info *info,

    34                            size_t size, void *data),

    35           void *data);

    36 #endif

    38 int dl_iterate_callback(struct dl_phdr_info *dl_info, size_t size, void *data)

    39 {

    40   SharedLibraryInfo& info = *reinterpret_cast<SharedLibraryInfo*>(data);

    42   if (dl_info->dlpi_phnum <= 0)

    43     return 0;

    45   unsigned long libStart = -1;

    46   unsigned long libEnd = 0;

    48   for (size_t i = 0; i < dl_info->dlpi_phnum; i++) {

    49     if (dl_info->dlpi_phdr[i].p_type != PT_LOAD) {

    50       continue;

    51     }

    52     unsigned long start = dl_info->dlpi_addr + dl_info->dlpi_phdr[i].p_vaddr;

    53     unsigned long end = start + dl_info->dlpi_phdr[i].p_memsz;

    54     if (start < libStart)

    55       libStart = start;

    56     if (end > libEnd)

    57       libEnd = end;

    58   }

    59   SharedLibrary shlib(libStart, libEnd, 0, "", dl_info->dlpi_name);

    60   info.AddSharedLibrary(shlib);

    62   return 0;

    63 }

    64 #endif

    66 SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf()

    67 {

    68   SharedLibraryInfo info;

    70 #if !defined(MOZ_WIDGET_GONK)

    71   dl_iterate_phdr(dl_iterate_callback, &info);

    72 #ifndef ANDROID

    73   return info;

    74 #endif

    75 #endif

    77   pid_t pid = getpid();

    78   char path[PATH_MAX];

    79   snprintf(path, PATH_MAX, "/proc/%d/maps", pid);

    80   std::ifstream maps(path);

    81   std::string line;

    82   int count = 0;

    83   while (std::getline(maps, line)) {

    84     int ret;

    85     //XXX: needs input sanitizing

    86     unsigned long start;

    87     unsigned long end;

    88     char perm[6] = "";

    89     unsigned long offset;

    90     char name[PATH_MAX] = "";

    91     ret = sscanf(line.c_str(),

    92                  "%lx-%lx %6s %lx %*s %*x %" PATH_MAX_STRING(PATH_MAX) "s\n",

    93                  &start, &end, perm, &offset, name);

    94     if (!strchr(perm, 'x')) {

    95       // Ignore non executable entries

    96       continue;

    97     }

    98     if (ret != 5 && ret != 4) {

    99       LOG("Get maps line failed");

   100       continue;

   101     }

   102 #if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)

   103     // Use proc/pid/maps to get the dalvik-jit section since it has

   104     // no associated phdrs

   105     if (strcmp(name, "/dev/ashmem/dalvik-jit-code-cache") != 0)

   106       continue;

   107 #else

   108     if (strcmp(perm, "r-xp") != 0) {

   109       // Ignore entries that are writable and/or shared.

   110       // At least one graphics driver uses short-lived "rwxs" mappings

   111       // (see bug 926734 comment 5), so just checking for 'x' isn't enough.

   112       continue;

   113     }

   114 #endif

   115     SharedLibrary shlib(start, end, offset, "", name);

   116     info.AddSharedLibrary(shlib);

   117     if (count > 10000) {

   118       LOG("Get maps failed");

   119       break;

   120     }

   121     count++;

   122   }

   123   return info;

   124 }

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