1 // Copyright 2019 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_PROFILER_CHROME_UNWINDER_ANDROID_H_ 6 #define BASE_PROFILER_CHROME_UNWINDER_ANDROID_H_ 7 8 #include "base/profiler/unwinder.h" 9 10 #include "base/base_export.h" 11 #include "base/optional.h" 12 #include "base/profiler/arm_cfi_table.h" 13 #include "base/profiler/module_cache.h" 14 #include "base/profiler/register_context.h" 15 16 namespace base { 17 18 // Chrome unwinder implementation for Android, using ArmCfiTable. 19 class BASE_EXPORT ChromeUnwinderAndroid : public Unwinder { 20 public: 21 ChromeUnwinderAndroid(const ArmCFITable* cfi_table, 22 uintptr_t chrome_module_base_address); 23 ~ChromeUnwinderAndroid() override; 24 ChromeUnwinderAndroid(const ChromeUnwinderAndroid&) = delete; 25 ChromeUnwinderAndroid& operator=(const ChromeUnwinderAndroid&) = delete; 26 27 // Unwinder: 28 bool CanUnwindFrom(const Frame& current_frame) const override; 29 UnwindResult TryUnwind(RegisterContext* thread_context, 30 uintptr_t stack_top, 31 ModuleCache* module_cache, 32 std::vector<Frame>* stack) const override; 33 StepForTesting(RegisterContext * thread_context,uintptr_t stack_top,const ArmCFITable::FrameEntry & entry)34 static bool StepForTesting(RegisterContext* thread_context, 35 uintptr_t stack_top, 36 const ArmCFITable::FrameEntry& entry) { 37 return Step(thread_context, stack_top, entry); 38 } 39 40 private: 41 static bool Step(RegisterContext* thread_context, 42 uintptr_t stack_top, 43 const ArmCFITable::FrameEntry& entry); 44 // Fallback setp that attempts to use lr as return address. 45 static bool StepUsingLrRegister(RegisterContext* thread_context, 46 uintptr_t stack_top); 47 48 const ArmCFITable* cfi_table_; 49 const uintptr_t chrome_module_base_address_; 50 }; 51 52 } // namespace base 53 54 #endif // BASE_PROFILER_CHROME_UNWINDER_ANDROID_H_ 55