// Copyright (c) 2008, Google Inc.
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//
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//
// ---
// Produces a stack trace for Windows. Normally, one could use
// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that
// should work for binaries compiled using MSVC in "debug" mode.
// However, in "release" mode, Windows uses frame-pointer
// optimization, which makes getting a stack trace very difficult.
//
// There are several approaches one can take. One is to use Windows
// intrinsics like StackWalk64. These can work, but have restrictions
// on how successful they can be. Another attempt is to write a
// version of stacktrace_x86-inl.h that has heuristic support for
// dealing with FPO, similar to what WinDbg does (see
// http://www.nynaeve.net/?p=97).
//
// The solution we've ended up doing is to call the undocumented
// windows function RtlCaptureStackBackTrace, which probably doesn't
// work with FPO but at least is fast, and doesn't require a symbol
// server.
//
// This code is inspired by a patch from David Vitek:
// http://code.google.com/p/gperftools/issues/detail?id=83
#ifndef BASE_STACKTRACE_WIN32_INL_H_
#define BASE_STACKTRACE_WIN32_INL_H_
// Note: this file is included into stacktrace.cc more than once.
// Anything that should only be defined once should be here:
#include "config.h"
#include <windows.h> // for GetProcAddress and GetModuleHandle
#include <assert.h>
typedef USHORT NTAPI RtlCaptureStackBackTrace_Function(
IN ULONG frames_to_skip,
IN ULONG frames_to_capture,
OUT PVOID *backtrace,
OUT PULONG backtrace_hash);
// Load the function we need at static init time, where we don't have
// to worry about someone else holding the loader's lock.
static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
(RtlCaptureStackBackTrace_Function*)
GetProcAddress(GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace");
PERFTOOLS_DLL_DECL int GetStackTrace(void** result, int max_depth,
int skip_count) {
if (!RtlCaptureStackBackTrace_fn) {
// TODO(csilvers): should we log an error here?
return 0; // can't find a stacktrace with no function to call
}
return (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth,
result, 0);
}
PERFTOOLS_DLL_DECL int GetStackFrames(void** /* pcs */,
int* /* sizes */,
int /* max_depth */,
int /* skip_count */) {
assert(0 == "Not yet implemented");
return 0;
}
#endif // BASE_STACKTRACE_WIN32_INL_H_