99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
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// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/profiler/native_unwinder_win.h"
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#include <winnt.h>
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#include "base/profiler/native_unwinder.h"
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#include "base/profiler/win32_stack_frame_unwinder.h"
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namespace base {
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bool NativeUnwinderWin::CanUnwindFrom(const Frame& current_frame) const {
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return current_frame.module && current_frame.module->IsNative();
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}
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// Attempts to unwind the frame represented by the context values. If
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// successful appends frames onto the stack and returns true. Otherwise
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// returns false.
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UnwindResult NativeUnwinderWin::TryUnwind(RegisterContext* thread_context,
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uintptr_t stack_top,
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ModuleCache* module_cache,
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std::vector<Frame>* stack) const {
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// We expect the frame correponding to the |thread_context| register state to
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// exist within |stack|.
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DCHECK_GT(stack->size(), 0u);
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Win32StackFrameUnwinder frame_unwinder;
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for (;;) {
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if (!stack->back().module) {
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// There's no loaded module corresponding to the current frame. This can
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// be due to executing code not in a module (e.g. runtime-generated code
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// associated with third-party injected DLLs) or the module having been
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// unloaded since we recorded the stack. In the latter case the function
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// unwind information was part of the unloaded module, so it's not
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// possible to unwind further.
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//
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// NB: if a module was found it's still theoretically possible for the
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// detected module module to be different than the one that was loaded
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// when the stack was copied, if the module was unloaded and a different
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// module loaded in overlapping memory. This likely would cause a crash
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// but has not been observed in practice.
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return UnwindResult::ABORTED;
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}
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if (!stack->back().module->IsNative()) {
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// This is a non-native module associated with the auxiliary unwinder
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// (e.g. corresponding to a frame in V8 generated code). Report as
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// UNRECOGNIZED_FRAME to allow that unwinder to unwind the frame.
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return UnwindResult::UNRECOGNIZED_FRAME;
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}
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uintptr_t prev_stack_pointer = RegisterContextStackPointer(thread_context);
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if (!frame_unwinder.TryUnwind(stack->size() == 1u, thread_context,
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stack->back().module)) {
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return UnwindResult::ABORTED;
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}
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if (ContextPC(thread_context) == 0)
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return UnwindResult::COMPLETED;
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// Exclusive range of expected stack pointer values after the unwind.
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struct {
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uintptr_t start;
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uintptr_t end;
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} expected_stack_pointer_range = {prev_stack_pointer, stack_top};
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// Abort if the unwind produced an invalid stack pointer.
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#if defined(ARCH_CPU_ARM64)
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// Leaf frames on Arm can re-use the stack pointer, so they can validly have
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// the same stack pointer as the previous frame.
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if (stack->size() == 1u) {
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expected_stack_pointer_range.start--;
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}
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#endif
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if (RegisterContextStackPointer(thread_context) <=
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expected_stack_pointer_range.start ||
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RegisterContextStackPointer(thread_context) >=
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expected_stack_pointer_range.end) {
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return UnwindResult::ABORTED;
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}
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// Record the frame to which we just unwound.
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stack->emplace_back(
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ContextPC(thread_context),
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module_cache->GetModuleForAddress(ContextPC(thread_context)));
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}
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NOTREACHED();
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return UnwindResult::COMPLETED;
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}
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std::unique_ptr<Unwinder> CreateNativeUnwinder(ModuleCache* module_cache) {
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return std::make_unique<NativeUnwinderWin>();
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}
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} // namespace base
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