libunwindstack: expose UnwindStackMap::GetFunctionName. (358de18b) · Commits · e / os / android_system_core

libbacktrace/UnwindStack.cpp

+2 −24

Original line number	Diff line number	Diff line
		@@ -44,28 +44,6 @@
		#include "UnwindStack.h"
		#include "UnwindStackMap.h"

		static std::string GetFunctionName(BacktraceMap* back_map, uintptr_t pc, uintptr_t* offset) {
		*offset = 0;
		unwindstack::Maps* maps = reinterpret_cast<UnwindStackMap*>(back_map)->stack_maps();

		// Get the map for this
		unwindstack::MapInfo* map_info = maps->Find(pc);
		if (map_info == nullptr \|\| map_info->flags & PROT_DEVICE_MAP) {
		return "";
		}

		UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map);
		unwindstack::Elf* elf = map_info->GetElf(stack_map->process_memory(), true);

		std::string name;
		uint64_t func_offset;
		if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) {
		return "";
		}
		*offset = func_offset;
		return name;
		}

		bool Backtrace::Unwind(unwindstack::Regs* regs, BacktraceMap* back_map,
		std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames) {
		static std::set<std::string> skip_names{"libunwindstack.so", "libbacktrace.so"};
		@@ -111,7 +89,7 @@ UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map)
		: BacktraceCurrent(pid, tid, map) {}

		std::string UnwindStackCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
		return ::GetFunctionName(GetMap(), pc, offset);
		return GetMap()->GetFunctionName(pc, offset);
		}

		bool UnwindStackCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) {
		@@ -134,7 +112,7 @@ UnwindStackPtrace::UnwindStackPtrace(pid_t pid, pid_t tid, BacktraceMap* map)
		: BacktracePtrace(pid, tid, map) {}

		std::string UnwindStackPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
		return ::GetFunctionName(GetMap(), pc, offset);
		return GetMap()->GetFunctionName(pc, offset);
		}

		bool UnwindStackPtrace::Unwind(size_t num_ignore_frames, ucontext_t* context) {

libbacktrace/UnwindStackMap.cpp

+21 −0

Original line number	Diff line number	Diff line
		@@ -75,6 +75,27 @@ void UnwindStackMap::FillIn(uintptr_t addr, backtrace_map_t* map) {
		map->load_bias = elf->GetLoadBias();
		}

		std::string UnwindStackMap::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
		*offset = 0;
		unwindstack::Maps* maps = stack_maps();

		// Get the map for this
		unwindstack::MapInfo* map_info = maps->Find(pc);
		if (map_info == nullptr \|\| map_info->flags & PROT_DEVICE_MAP) {
		return "";
		}

		unwindstack::Elf* elf = map_info->GetElf(process_memory(), true);

		std::string name;
		uint64_t func_offset;
		if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) {
		return "";
		}
		*offset = func_offset;
		return name;
		}

		//-------------------------------------------------------------------------
		// BacktraceMap create function.
		//-------------------------------------------------------------------------

libbacktrace/UnwindStackMap.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,8 @@ class UnwindStackMap : public BacktraceMap {

		void FillIn(uintptr_t addr, backtrace_map_t* map) override;

		virtual std::string GetFunctionName(uintptr_t pc, uintptr_t* offset) override;

		unwindstack::Maps* stack_maps() { return stack_maps_.get(); }

		const std::shared_ptr<unwindstack::Memory>& process_memory() { return process_memory_; }

libbacktrace/include/backtrace/BacktraceMap.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -62,6 +62,9 @@ public:
		// Fill in the map data structure for the given address.
		virtual void FillIn(uintptr_t addr, backtrace_map_t* map);

		// Only supported with the new unwinder.
		virtual std::string GetFunctionName(uintptr_t /pc/, uintptr_t* /offset/) { return ""; }

		// The flags returned are the same flags as used by the mmap call.
		// The values are PROT_*.
		int GetFlags(uintptr_t pc) {