Replace DumpBacktrace with Chromium's StackTrace implementation.

src/base/debug/stack_trace_win.cc

Index: src/base/debug/stack_trace_win.cc
diff --git a/src/base/debug/stack_trace_win.cc b/src/base/debug/stack_trace_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8333cd9ea8f327e09b0c0161d3aa0767c6350012
--- /dev/null
+++ b/src/base/debug/stack_trace_win.cc
@@ -0,0 +1,248 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Slightly adapted for inclusion in V8.
+// Copyright 2016 the V8 project authors. All rights reserved.
+
+#include "src/base/debug/stack_trace.h"
+
+#include <windows.h>
+#include <dbghelp.h>
+#include <Shlwapi.h>
+#include <stddef.h>
+
+#include <iostream>
+#include <memory>
+
+#include "src/base/logging.h"
+#include "src/base/macros.h"
+
+namespace v8 {
+namespace base {
+namespace debug {
+
+namespace {
+
+// Previous unhandled filter. Will be called if not NULL when we intercept an
+// exception. Only used in unit tests.
+LPTOP_LEVEL_EXCEPTION_FILTER g_previous_filter = NULL;
+
+bool g_dump_stack_in_signal_handler = true;
+bool g_initialized_symbols = false;
+DWORD g_init_error = ERROR_SUCCESS;
+
+// Prints the exception call stack.
+// This is the unit tests exception filter.
+long WINAPI StackDumpExceptionFilter(EXCEPTION_POINTERS* info) {  // NOLINT
+  if (g_dump_stack_in_signal_handler) {
+    debug::StackTrace(info).Print();
+  }
+  if (g_previous_filter) return g_previous_filter(info);
+  return EXCEPTION_CONTINUE_SEARCH;
+}
+
+void GetExePath(wchar_t* path_out) {
+  GetModuleFileName(NULL, path_out, MAX_PATH);
+  path_out[MAX_PATH - 1] = L'\0';
+  PathRemoveFileSpec(path_out);
+}
+
+bool InitializeSymbols() {
+  if (g_initialized_symbols) return g_init_error == ERROR_SUCCESS;
+  g_initialized_symbols = true;
+  // Defer symbol load until they're needed, use undecorated names, and get line
+  // numbers.
+  SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME | SYMOPT_LOAD_LINES);
+  if (!SymInitialize(GetCurrentProcess(), NULL, TRUE)) {
+    g_init_error = GetLastError();
+    // TODO(awong): Handle error: SymInitialize can fail with
+    // ERROR_INVALID_PARAMETER.
+    // When it fails, we should not call debugbreak since it kills the current
+    // process (prevents future tests from running or kills the browser
+    // process).
+    return false;
+  }
+
+  // When transferring the binaries e.g. between bots, path put
+  // into the executable will get off. To still retrieve symbols correctly,
+  // add the directory of the executable to symbol search path.
+  // All following errors are non-fatal.
+  const size_t kSymbolsArraySize = 1024;
+  std::unique_ptr<wchar_t[]> symbols_path(new wchar_t[kSymbolsArraySize]);
+
+  // Note: The below function takes buffer size as number of characters,
+  // not number of bytes!
+  if (!SymGetSearchPathW(GetCurrentProcess(), symbols_path.get(),
+                         kSymbolsArraySize)) {
+    g_init_error = GetLastError();
+    return false;
+  }
+
+  wchar_t exe_path[MAX_PATH];
+  GetExePath(exe_path);
+  std::wstring new_path(std::wstring(symbols_path.get()) + L";" +
+                        std::wstring(exe_path));
+  if (!SymSetSearchPathW(GetCurrentProcess(), new_path.c_str())) {
+    g_init_error = GetLastError();
+    return false;
+  }
+
+  g_init_error = ERROR_SUCCESS;
+  return true;
+}
+
+// For the given trace, attempts to resolve the symbols, and output a trace
+// to the ostream os.  The format for each line of the backtrace is:
+//
+//    <tab>SymbolName[0xAddress+Offset] (FileName:LineNo)
+//
+// This function should only be called if Init() has been called.  We do not
+// LOG(FATAL) here because this code is called might be triggered by a
+// LOG(FATAL) itself. Also, it should not be calling complex code that is
+// extensible like PathService since that can in turn fire CHECKs.
+void OutputTraceToStream(const void* const* trace, size_t count,
+                         std::ostream* os) {
+  for (size_t i = 0; (i < count) && os->good(); ++i) {
+    const int kMaxNameLength = 256;
+    DWORD_PTR frame = reinterpret_cast<DWORD_PTR>(trace[i]);
+
+    // Code adapted from MSDN example:
+    // http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx
+    ULONG64 buffer[(sizeof(SYMBOL_INFO) + kMaxNameLength * sizeof(wchar_t) +
+                    sizeof(ULONG64) - 1) /
+                   sizeof(ULONG64)];
+    memset(buffer, 0, sizeof(buffer));
+
+    // Initialize symbol information retrieval structures.
+    DWORD64 sym_displacement = 0;
+    PSYMBOL_INFO symbol = reinterpret_cast<PSYMBOL_INFO>(&buffer[0]);
+    symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
+    symbol->MaxNameLen = kMaxNameLength - 1;
+    BOOL has_symbol =
+        SymFromAddr(GetCurrentProcess(), frame, &sym_displacement, symbol);
+
+    // Attempt to retrieve line number information.
+    DWORD line_displacement = 0;
+    IMAGEHLP_LINE64 line = {};
+    line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
+    BOOL has_line = SymGetLineFromAddr64(GetCurrentProcess(), frame,
+                                         &line_displacement, &line);
+
+    // Output the backtrace line.
+    (*os) << "\t";
+    if (has_symbol) {
+      (*os) << symbol->Name << " [0x" << trace[i] << "+" << sym_displacement
+            << "]";
+    } else {
+      // If there is no symbol information, add a spacer.
+      (*os) << "(No symbol) [0x" << trace[i] << "]";
+    }
+    if (has_line) {
+      (*os) << " (" << line.FileName << ":" << line.LineNumber << ")";
+    }
+    (*os) << "\n";
+  }
+}
+
+}  // namespace
+
+bool EnableInProcessStackDumping() {
+  // Add stack dumping support on exception on windows. Similar to OS_POSIX
+  // signal() handling in process_util_posix.cc.
+  g_previous_filter = SetUnhandledExceptionFilter(&StackDumpExceptionFilter);
+  g_dump_stack_in_signal_handler = true;
+
+  // Need to initialize symbols early in the process or else this fails on
+  // swarming (since symbols are in different directory than in the exes) and
+  // also release x64.
+  return InitializeSymbols();
+}
+
+void DisableSignalStackDump() {
+  g_dump_stack_in_signal_handler = false;
+}
+
+// Disable optimizations for the StackTrace::StackTrace function. It is
+// important to disable at least frame pointer optimization ("y"), since
+// that breaks CaptureStackBackTrace() and prevents StackTrace from working
+// in Release builds (it may still be janky if other frames are using FPO,
+// but at least it will make it further).
+#if defined(COMPILER_MSVC)
+#pragma optimize("", off)
+#endif
+
+StackTrace::StackTrace() {
+  // When walking our own stack, use CaptureStackBackTrace().
+  count_ = CaptureStackBackTrace(0, arraysize(trace_), trace_, NULL);
+}
+
+#if defined(COMPILER_MSVC)
+#pragma optimize("", on)
+#endif
+
+StackTrace::StackTrace(EXCEPTION_POINTERS* exception_pointers) {
+  InitTrace(exception_pointers->ContextRecord);
+}
+
+StackTrace::StackTrace(const CONTEXT* context) { InitTrace(context); }
+
+void StackTrace::InitTrace(const CONTEXT* context_record) {
+  // StackWalk64 modifies the register context in place, so we have to copy it
+  // so that downstream exception handlers get the right context.  The incoming
+  // context may have had more register state (YMM, etc) than we need to unwind
+  // the stack. Typically StackWalk64 only needs integer and control registers.
+  CONTEXT context_copy;
+  memcpy(&context_copy, context_record, sizeof(context_copy));
+  context_copy.ContextFlags = CONTEXT_INTEGER | CONTEXT_CONTROL;
+
+  // When walking an exception stack, we need to use StackWalk64().
+  count_ = 0;
+  // Initialize stack walking.
+  STACKFRAME64 stack_frame;
+  memset(&stack_frame, 0, sizeof(stack_frame));
+#if defined(_WIN64)
+  int machine_type = IMAGE_FILE_MACHINE_AMD64;
+  stack_frame.AddrPC.Offset = context_record->Rip;
+  stack_frame.AddrFrame.Offset = context_record->Rbp;
+  stack_frame.AddrStack.Offset = context_record->Rsp;
+#else
+  int machine_type = IMAGE_FILE_MACHINE_I386;
+  stack_frame.AddrPC.Offset = context_record->Eip;
+  stack_frame.AddrFrame.Offset = context_record->Ebp;
+  stack_frame.AddrStack.Offset = context_record->Esp;
+#endif
+  stack_frame.AddrPC.Mode = AddrModeFlat;
+  stack_frame.AddrFrame.Mode = AddrModeFlat;
+  stack_frame.AddrStack.Mode = AddrModeFlat;
+  while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
+                     &stack_frame, &context_copy, NULL,
+                     &SymFunctionTableAccess64, &SymGetModuleBase64, NULL) &&
+         count_ < arraysize(trace_)) {
+    trace_[count_++] = reinterpret_cast<void*>(stack_frame.AddrPC.Offset);
+  }
+
+  for (size_t i = count_; i < arraysize(trace_); ++i) trace_[i] = NULL;
+}
+
+void StackTrace::Print() const { OutputToStream(&std::cerr); }
+
+void StackTrace::OutputToStream(std::ostream* os) const {
+  InitializeSymbols();
+  if (g_init_error != ERROR_SUCCESS) {
+    (*os) << "Error initializing symbols (" << g_init_error
+          << ").  Dumping unresolved backtrace:\n";
+    for (size_t i = 0; (i < count_) && os->good(); ++i) {
+      (*os) << "\t" << trace_[i] << "\n";
+    }
+  } else {
+    (*os) << "\n";
+    (*os) << "==== C stack trace ===============================\n";
+    (*os) << "\n";
+    OutputTraceToStream(trace_, count_, os);
+  }
+}
+
+}  // namespace debug
+}  // namespace base
+}  // namespace v8