diff options
author | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2019-05-24 11:40:17 +0200 |
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committer | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2019-05-24 12:42:11 +0000 |
commit | 5d87695f37678f96492b258bbab36486c59866b4 (patch) | |
tree | be9783bbaf04fb930c4d74ca9c00b5e7954c8bc6 /chromium/base/profiler/thread_delegate.h | |
parent | 6c11fb357ec39bf087b8b632e2b1e375aef1b38b (diff) |
BASELINE: Update Chromium to 75.0.3770.56
Change-Id: I86d2007fd27a45d5797eee06f4c9369b8b50ac4f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Diffstat (limited to 'chromium/base/profiler/thread_delegate.h')
-rw-r--r-- | chromium/base/profiler/thread_delegate.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/chromium/base/profiler/thread_delegate.h b/chromium/base/profiler/thread_delegate.h new file mode 100644 index 00000000000..d0f0f028405 --- /dev/null +++ b/chromium/base/profiler/thread_delegate.h @@ -0,0 +1,72 @@ +// Copyright 2019 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_THREAD_DELEGATE_H_ +#define BASE_PROFILER_THREAD_DELEGATE_H_ + +#include <vector> + +#include "base/base_export.h" +#include "base/profiler/frame.h" +#include "base/profiler/register_context.h" + +namespace base { + +// Platform-specific thread and stack manipulation delegate, for use by the +// platform-independent stack copying/walking implementation in +// StackSamplerImpl. +// +// IMPORTANT NOTE: Most methods in this interface are invoked while the target +// thread is suspended so must not do any allocation from the heap, including +// indirectly via use of DCHECK/CHECK or other logging statements. Otherwise the +// implementation can deadlock on heap locks acquired by the target thread +// before it was suspended. These functions are commented with "NO HEAP +// ALLOCATIONS". +class BASE_EXPORT ThreadDelegate { + public: + // Implementations of this interface should suspend the thread for the + // object's lifetime. NO HEAP ALLOCATIONS between the time the thread is + // suspended and resumed. + class BASE_EXPORT ScopedSuspendThread { + public: + ScopedSuspendThread() = default; + virtual ~ScopedSuspendThread() = default; + + ScopedSuspendThread(const ScopedSuspendThread&) = delete; + ScopedSuspendThread& operator=(const ScopedSuspendThread&) = delete; + + virtual bool WasSuccessful() const = 0; + }; + + ThreadDelegate() = default; + virtual ~ThreadDelegate() = default; + + ThreadDelegate(const ThreadDelegate&) = delete; + ThreadDelegate& operator=(const ThreadDelegate&) = delete; + + // Creates an object that holds the thread suspended for its lifetime. + virtual std::unique_ptr<ScopedSuspendThread> CreateScopedSuspendThread() = 0; + + // Gets the register context for the thread. + // NO HEAP ALLOCATIONS. + virtual bool GetThreadContext(RegisterContext* thread_context) = 0; + + // Gets the base address of the thread's stack. + virtual uintptr_t GetStackBaseAddress() const = 0; + + // Returns true if the thread's stack can be copied, where the bottom address + // of the thread is at |stack_pointer|. + // NO HEAP ALLOCATIONS. + virtual bool CanCopyStack(uintptr_t stack_pointer) = 0; + + // Returns a list of registers that should be rewritten to point into the + // stack copy, if they originally pointed into the original stack. + // May heap allocate. + virtual std::vector<uintptr_t*> GetRegistersToRewrite( + RegisterContext* thread_context) = 0; +}; + +} // namespace base + +#endif // BASE_PROFILER_THREAD_DELEGATE_H_ |