1 files changed, 116 insertions, 0 deletions
diff --git a/toolkit/crashreporter/minidump-analyzer/MozStackFrameSymbolizer.cpp b/toolkit/crashreporter/minidump-analyzer/MozStackFrameSymbolizer.cpp
new file mode 100644
index 0000000000..7d7e3c4b2f
--- /dev/null
+++ b/toolkit/crashreporter/minidump-analyzer/MozStackFrameSymbolizer.cpp
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if XP_WIN && HAVE_64BIT_BUILD
+
+#  include "MozStackFrameSymbolizer.h"
+
+#  include "MinidumpAnalyzerUtils.h"
+
+#  include "processor/cfi_frame_info.h"
+
+#  include <sstream>
+#  include <fstream>
+
+namespace CrashReporter {
+
+extern MinidumpAnalyzerOptions gMinidumpAnalyzerOptions;
+
+using google_breakpad::CFIFrameInfo;
+
+MozStackFrameSymbolizer::MozStackFrameSymbolizer()
+    : StackFrameSymbolizer(nullptr, nullptr) {}
+
+MozStackFrameSymbolizer::SymbolizerResult
+MozStackFrameSymbolizer::FillSourceLineInfo(const CodeModules* modules,
+                                            const CodeModules* unloaded_modules,
+                                            const SystemInfo* system_info,
+                                            StackFrame* stack_frame) {
+  SymbolizerResult ret = StackFrameSymbolizer::FillSourceLineInfo(
+      modules, unloaded_modules, system_info, stack_frame);
+
+  if (ret == kNoError && this->HasImplementation() &&
+      stack_frame->function_name.empty()) {
+    // Breakpad's Stackwalker::InstructionAddressSeemsValid only considers an
+    // address valid if it has associated symbols.
+    //
+    // This makes sense for complete & accurate symbols, but ours may be
+    // incomplete or wrong. Returning a function name tells Breakpad we
+    // recognize this address as code, so it's OK to use in stack scanning.
+    // This function is only called with addresses that land in this module.
+    //
+    // This allows us to fall back to stack scanning in the case where we were
+    // unable to provide CFI.
+    stack_frame->function_name = "<unknown code>";
+  }
+  return ret;
+}
+
+CFIFrameInfo* MozStackFrameSymbolizer::FindCFIFrameInfo(
+    const StackFrame* frame) {
+  std::string modulePath;
+
+  // For unit testing, support loading a specified module instead of
+  // the real one.
+  bool moduleHasBeenReplaced = false;
+  if (gMinidumpAnalyzerOptions.forceUseModule.size() > 0) {
+    modulePath = gMinidumpAnalyzerOptions.forceUseModule;
+    moduleHasBeenReplaced = true;
+  } else {
+    if (!frame->module) {
+      return nullptr;
+    }
+    modulePath = frame->module->code_file();
+  }
+
+  // Get/create the unwind parser.
+  auto itMod = mModuleMap.find(modulePath);
+  std::shared_ptr<ModuleUnwindParser> unwindParser;
+  if (itMod != mModuleMap.end()) {
+    unwindParser = itMod->second;
+  } else {
+    unwindParser.reset(new ModuleUnwindParser(modulePath));
+    mModuleMap[modulePath] = unwindParser;
+  }
+
+  UnwindCFI cfi;
+  DWORD offsetAddr;
+
+  if (moduleHasBeenReplaced) {
+    // If we are replacing a module, addresses will never line up.
+    // So just act like the 1st entry is correct.
+    offsetAddr = unwindParser->GetAnyOffsetAddr();
+  } else {
+    offsetAddr = frame->instruction - frame->module->base_address();
+  }
+
+  if (!unwindParser->GetCFI(offsetAddr, cfi)) {
+    return nullptr;
+  }
+
+  std::unique_ptr<CFIFrameInfo> rules(new CFIFrameInfo());
+
+  static const size_t exprSize = 50;
+  char expr[exprSize];
+  if (cfi.stackSize == 0) {
+    snprintf(expr, exprSize, "$rsp");
+  } else {
+    snprintf(expr, exprSize, "$rsp %d +", cfi.stackSize);
+  }
+  rules->SetCFARule(expr);
+
+  if (cfi.ripOffset == 0) {
+    snprintf(expr, exprSize, ".cfa ^");
+  } else {
+    snprintf(expr, exprSize, ".cfa %d - ^", cfi.ripOffset);
+  }
+  rules->SetRARule(expr);
+
+  return rules.release();
+}
+
+}  // namespace CrashReporter
+
+#endif  // XP_WIN && HAVE_64BIT_BUILD