| // 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_ |