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// Copyright 2015 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.
#ifndef BASE_PROFILER_WIN32_STACK_FRAME_UNWINDER_H_
#define BASE_PROFILER_WIN32_STACK_FRAME_UNWINDER_H_
#include <windows.h>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/win/scoped_handle.h"
namespace base {
#if !defined(_WIN64)
// Allows code to compile for x86. Actual support for x86 will require either
// refactoring these interfaces or separate architecture-specific interfaces.
struct RUNTIME_FUNCTION {
DWORD BeginAddress;
DWORD EndAddress;
};
using PRUNTIME_FUNCTION = RUNTIME_FUNCTION*;
#endif // !defined(_WIN64)
// Traits class to adapt GenericScopedHandle for HMODULES.
class ModuleHandleTraits : public win::HandleTraits {
public:
using Handle = HMODULE;
static bool BASE_EXPORT CloseHandle(HMODULE handle);
static bool BASE_EXPORT IsHandleValid(HMODULE handle);
static HMODULE BASE_EXPORT NullHandle();
BASE_EXPORT static const HMODULE kNonNullModuleForTesting;
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(ModuleHandleTraits);
};
// HMODULE is not really a handle, and has reference count semantics, so the
// standard VerifierTraits does not apply.
using ScopedModuleHandle =
win::GenericScopedHandle<ModuleHandleTraits, win::DummyVerifierTraits>;
// Instances of this class are expected to be created and destroyed for each
// stack unwinding. This class is not used while the target thread is suspended,
// so may allocate from the default heap.
class BASE_EXPORT Win32StackFrameUnwinder {
public:
// Interface for Win32 unwind-related functionality this class depends
// on. Provides a seam for testing.
class BASE_EXPORT UnwindFunctions {
public:
virtual ~UnwindFunctions();
virtual PRUNTIME_FUNCTION LookupFunctionEntry(DWORD64 program_counter,
PDWORD64 image_base) = 0;
virtual void VirtualUnwind(DWORD64 image_base,
DWORD64 program_counter,
PRUNTIME_FUNCTION runtime_function,
CONTEXT* context) = 0;
// Returns the module containing |program_counter|. Can return null if the
// module has been unloaded.
virtual ScopedModuleHandle GetModuleForProgramCounter(
DWORD64 program_counter) = 0;
protected:
UnwindFunctions();
private:
DISALLOW_COPY_AND_ASSIGN(UnwindFunctions);
};
Win32StackFrameUnwinder();
~Win32StackFrameUnwinder();
// Attempts to unwind the frame represented by the stack and instruction
// pointers in |context|. If successful, updates |context| and provides the
// module associated with the frame in |module|.
bool TryUnwind(CONTEXT* context, ScopedModuleHandle* module);
private:
// This function is for internal and test purposes only.
Win32StackFrameUnwinder(scoped_ptr<UnwindFunctions> unwind_functions);
friend class Win32StackFrameUnwinderTest;
// State associated with each stack unwinding.
bool at_top_frame_;
bool unwind_info_present_for_all_frames_;
scoped_ptr<UnwindFunctions> unwind_functions_;
DISALLOW_COPY_AND_ASSIGN(Win32StackFrameUnwinder);
};
} // namespace base
#endif // BASE_PROFILER_WIN32_STACK_FRAME_UNWINDER_H_
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