contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc

   1 //===-- sanitizer_symbolizer.cc -------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is shared between AddressSanitizer and ThreadSanitizer
  10 // run-time libraries.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_allocator_internal.h"
  14 #include "sanitizer_platform.h"
  15 #include "sanitizer_internal_defs.h"
  16 #include "sanitizer_libc.h"
  17 #include "sanitizer_placement_new.h"
  18 #include "sanitizer_symbolizer_internal.h"
  19
  20 namespace __sanitizer {
  21
  22 AddressInfo::AddressInfo() {
  23   internal_memset(this, 0, sizeof(AddressInfo));
  24   function_offset = kUnknown;
  25 }
  26
  27 void AddressInfo::Clear() {
  28   InternalFree(module);
  29   InternalFree(function);
  30   InternalFree(file);
  31   internal_memset(this, 0, sizeof(AddressInfo));
  32   function_offset = kUnknown;
  33 }
  34
  35 void AddressInfo::FillModuleInfo(const char *mod_name, uptr mod_offset,
  36                                  ModuleArch mod_arch) {
  37   module = internal_strdup(mod_name);
  38   module_offset = mod_offset;
  39   module_arch = mod_arch;
  40 }
  41
  42 SymbolizedStack::SymbolizedStack() : next(nullptr), info() {}
  43
  44 SymbolizedStack *SymbolizedStack::New(uptr addr) {
  45   void *mem = InternalAlloc(sizeof(SymbolizedStack));
  46   SymbolizedStack *res = new(mem) SymbolizedStack();
  47   res->info.address = addr;
  48   return res;
  49 }
  50
  51 void SymbolizedStack::ClearAll() {
  52   info.Clear();
  53   if (next)
  54     next->ClearAll();
  55   InternalFree(this);
  56 }
  57
  58 DataInfo::DataInfo() {
  59   internal_memset(this, 0, sizeof(DataInfo));
  60 }
  61
  62 void DataInfo::Clear() {
  63   InternalFree(module);
  64   InternalFree(file);
  65   InternalFree(name);
  66   internal_memset(this, 0, sizeof(DataInfo));
  67 }
  68
  69 void FrameInfo::Clear() {
  70   InternalFree(module);
  71   for (LocalInfo &local : locals) {
  72     InternalFree(local.function_name);
  73     InternalFree(local.name);
  74     InternalFree(local.decl_file);
  75   }
  76   locals.clear();
  77 }
  78
  79 Symbolizer *Symbolizer::symbolizer_;
  80 StaticSpinMutex Symbolizer::init_mu_;
  81 LowLevelAllocator Symbolizer::symbolizer_allocator_;
  82
  83 void Symbolizer::InvalidateModuleList() {
  84   modules_fresh_ = false;
  85 }
  86
  87 void Symbolizer::AddHooks(Symbolizer::StartSymbolizationHook start_hook,
  88                           Symbolizer::EndSymbolizationHook end_hook) {
  89   CHECK(start_hook_ == 0 && end_hook_ == 0);
  90   start_hook_ = start_hook;
  91   end_hook_ = end_hook;
  92 }
  93
  94 const char *Symbolizer::ModuleNameOwner::GetOwnedCopy(const char *str) {
  95   mu_->CheckLocked();
  96
  97   // 'str' will be the same string multiple times in a row, optimize this case.
  98   if (last_match_ && !internal_strcmp(last_match_, str))
  99     return last_match_;
 100
 101   // FIXME: this is linear search.
 102   // We should optimize this further if this turns out to be a bottleneck later.
 103   for (uptr i = 0; i < storage_.size(); ++i) {
 104     if (!internal_strcmp(storage_[i], str)) {
 105       last_match_ = storage_[i];
 106       return last_match_;
 107     }
 108   }
 109   last_match_ = internal_strdup(str);
 110   storage_.push_back(last_match_);
 111   return last_match_;
 112 }
 113
 114 Symbolizer::Symbolizer(IntrusiveList<SymbolizerTool> tools)
 115     : module_names_(&mu_), modules_(), modules_fresh_(false), tools_(tools),
 116       start_hook_(0), end_hook_(0) {}
 117
 118 Symbolizer::SymbolizerScope::SymbolizerScope(const Symbolizer *sym)
 119     : sym_(sym) {
 120   if (sym_->start_hook_)
 121     sym_->start_hook_();
 122 }
 123
 124 Symbolizer::SymbolizerScope::~SymbolizerScope() {
 125   if (sym_->end_hook_)
 126     sym_->end_hook_();
 127 }
 128
 129 }  // namespace __sanitizer