Repo created

TMessagesProj/jni/voip/webrtc/base/profiler/native_unwinder_mac.h

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+// 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_NATIVE_UNWINDER_MAC_H_
+#define BASE_PROFILER_NATIVE_UNWINDER_MAC_H_
+
+#include <libunwind.h>
+
+#include "base/macros.h"
+#include "base/optional.h"
+#include "base/profiler/unwinder.h"
+
+namespace base {
+
+// Native unwinder implementation for Mac, using libunwind.
+class NativeUnwinderMac : public Unwinder {
+ public:
+  NativeUnwinderMac(ModuleCache* module_cache);
+
+  NativeUnwinderMac(const NativeUnwinderMac&) = delete;
+  NativeUnwinderMac& operator=(const NativeUnwinderMac&) = delete;
+
+  // Unwinder:
+  bool CanUnwindFrom(const Frame& current_frame) const override;
+  UnwindResult TryUnwind(RegisterContext* thread_context,
+                         uintptr_t stack_top,
+                         ModuleCache* module_cache,
+                         std::vector<Frame>* stack) const override;
+
+ private:
+  Optional<UnwindResult> CheckPreconditions(const Frame* current_frame,
+                                            unw_cursor_t* unwind_cursor,
+                                            uintptr_t stack_top) const;
+
+  // Returns the result from unw_step.
+  int UnwindStep(unw_context_t* unwind_context,
+                 unw_cursor_t* cursor,
+                 bool at_first_frame,
+                 ModuleCache* module_cache) const;
+
+  Optional<UnwindResult> CheckPostconditions(int step_result,
+                                             unw_word_t prev_rsp,
+                                             unw_word_t rsp,
+                                             uintptr_t stack_top,
+                                             bool* should_record_frame) const;
+
+  // Cached pointer to the libsystem_kernel module.
+  const ModuleCache::Module* const libsystem_kernel_module_;
+
+  // The address range of |_sigtramp|, the signal trampoline function.
+  uintptr_t sigtramp_start_;
+  uintptr_t sigtramp_end_;
+};
+
+}  // namespace base
+
+#endif  // BASE_PROFILER_NATIVE_UNWINDER_MAC_H_