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

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