reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
//===-- sanitizer_symbolizer.cpp ------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//

#include "sanitizer_allocator_internal.h"
#include "sanitizer_platform.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_symbolizer_internal.h"

namespace __sanitizer {

AddressInfo::AddressInfo() {
  internal_memset(this, 0, sizeof(AddressInfo));
  function_offset = kUnknown;
}

void AddressInfo::Clear() {
  InternalFree(module);
  InternalFree(function);
  InternalFree(file);
  internal_memset(this, 0, sizeof(AddressInfo));
  function_offset = kUnknown;
}

void AddressInfo::FillModuleInfo(const char *mod_name, uptr mod_offset,
                                 ModuleArch mod_arch) {
  module = internal_strdup(mod_name);
  module_offset = mod_offset;
  module_arch = mod_arch;
}

SymbolizedStack::SymbolizedStack() : next(nullptr), info() {}

SymbolizedStack *SymbolizedStack::New(uptr addr) {
  void *mem = InternalAlloc(sizeof(SymbolizedStack));
  SymbolizedStack *res = new(mem) SymbolizedStack();
  res->info.address = addr;
  return res;
}

void SymbolizedStack::ClearAll() {
  info.Clear();
  if (next)
    next->ClearAll();
  InternalFree(this);
}

DataInfo::DataInfo() {
  internal_memset(this, 0, sizeof(DataInfo));
}

void DataInfo::Clear() {
  InternalFree(module);
  InternalFree(file);
  InternalFree(name);
  internal_memset(this, 0, sizeof(DataInfo));
}

void FrameInfo::Clear() {
  InternalFree(module);
  for (LocalInfo &local : locals) {
    InternalFree(local.function_name);
    InternalFree(local.name);
    InternalFree(local.decl_file);
  }
  locals.clear();
}

Symbolizer *Symbolizer::symbolizer_;
StaticSpinMutex Symbolizer::init_mu_;
LowLevelAllocator Symbolizer::symbolizer_allocator_;

void Symbolizer::InvalidateModuleList() {
  modules_fresh_ = false;
}

void Symbolizer::AddHooks(Symbolizer::StartSymbolizationHook start_hook,
                          Symbolizer::EndSymbolizationHook end_hook) {
  CHECK(start_hook_ == 0 && end_hook_ == 0);
  start_hook_ = start_hook;
  end_hook_ = end_hook;
}

const char *Symbolizer::ModuleNameOwner::GetOwnedCopy(const char *str) {
  mu_->CheckLocked();

  // 'str' will be the same string multiple times in a row, optimize this case.
  if (last_match_ && !internal_strcmp(last_match_, str))
    return last_match_;

  // FIXME: this is linear search.
  // We should optimize this further if this turns out to be a bottleneck later.
  for (uptr i = 0; i < storage_.size(); ++i) {
    if (!internal_strcmp(storage_[i], str)) {
      last_match_ = storage_[i];
      return last_match_;
    }
  }
  last_match_ = internal_strdup(str);
  storage_.push_back(last_match_);
  return last_match_;
}

Symbolizer::Symbolizer(IntrusiveList<SymbolizerTool> tools)
    : module_names_(&mu_), modules_(), modules_fresh_(false), tools_(tools),
      start_hook_(0), end_hook_(0) {}

Symbolizer::SymbolizerScope::SymbolizerScope(const Symbolizer *sym)
    : sym_(sym) {
  if (sym_->start_hook_)
    sym_->start_hook_();
}

Symbolizer::SymbolizerScope::~SymbolizerScope() {
  if (sym_->end_hook_)
    sym_->end_hook_();
}

}  // namespace __sanitizer