Modify the offline handling interface.
- Add a new function Backtrace::UnwindOffline that takes the stack data.
- Modify BacktraceMap::CreateOffline so it doesn't take the stack data.
This makes it easier to reuse the map object created this way.
Reusing the map object increases simpleperf speed (unwinds per second) by 50%.
Test: backtrace_test libunwindstack_test
Change-Id: I90cfbae9e50d95d8a0e3cd394b33ba36d65d45f7
diff --git a/libbacktrace/UnwindStack.cpp b/libbacktrace/UnwindStack.cpp
index 0e32e47..711a12a 100644
--- a/libbacktrace/UnwindStack.cpp
+++ b/libbacktrace/UnwindStack.cpp
@@ -128,6 +128,22 @@
return true;
}
+bool Backtrace::UnwindOffline(unwindstack::Regs* regs, BacktraceMap* back_map,
+ const backtrace_stackinfo_t& stack,
+ std::vector<backtrace_frame_data_t>* frames,
+ BacktraceUnwindError* error) {
+ UnwindStackOfflineMap* offline_map = reinterpret_cast<UnwindStackOfflineMap*>(back_map);
+ // Create the process memory from the stack data since this will almost
+ // always be different each unwind.
+ if (!offline_map->CreateProcessMemory(stack)) {
+ if (error != nullptr) {
+ error->error_code = BACKTRACE_UNWIND_ERROR_SETUP_FAILED;
+ }
+ return false;
+ }
+ return Backtrace::Unwind(regs, back_map, frames, 0U, nullptr, error);
+}
+
UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map)
: BacktraceCurrent(pid, tid, map) {}
@@ -221,12 +237,12 @@
Backtrace* Backtrace::CreateOffline(ArchEnum arch, pid_t pid, pid_t tid,
const std::vector<backtrace_map_t>& maps,
const backtrace_stackinfo_t& stack) {
- BacktraceMap* map = BacktraceMap::CreateOffline(pid, maps, stack);
- if (map == nullptr) {
+ std::unique_ptr<UnwindStackOfflineMap> map(
+ reinterpret_cast<UnwindStackOfflineMap*>(BacktraceMap::CreateOffline(pid, maps)));
+ if (map.get() == nullptr || !map->CreateProcessMemory(stack)) {
return nullptr;
}
-
- return new UnwindStackOffline(arch, pid, tid, map, false);
+ return new UnwindStackOffline(arch, pid, tid, map.release(), false);
}
Backtrace* Backtrace::CreateOffline(ArchEnum arch, pid_t pid, pid_t tid, BacktraceMap* map) {
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index 6dcc621..9c6fed4 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -127,12 +127,7 @@
return false;
}
-bool UnwindStackOfflineMap::Build(const std::vector<backtrace_map_t>& backtrace_maps,
- const backtrace_stackinfo_t& stack) {
- if (stack.start >= stack.end) {
- return false;
- }
-
+bool UnwindStackOfflineMap::Build(const std::vector<backtrace_map_t>& backtrace_maps) {
for (const backtrace_map_t& map : backtrace_maps) {
maps_.push_back(map);
}
@@ -145,6 +140,13 @@
for (const backtrace_map_t& map : maps_) {
maps->Add(map.start, map.end, map.offset, map.flags, map.name, map.load_bias);
}
+ return true;
+}
+
+bool UnwindStackOfflineMap::CreateProcessMemory(const backtrace_stackinfo_t& stack) {
+ if (stack.start >= stack.end) {
+ return false;
+ }
// Create the process memory from the stack data.
uint64_t size = stack.end - stack.start;
@@ -154,7 +156,6 @@
std::shared_ptr<unwindstack::Memory> shared_memory(memory);
process_memory_.reset(new unwindstack::MemoryRange(shared_memory, 0, size, stack.start));
-
return true;
}
@@ -182,10 +183,9 @@
//-------------------------------------------------------------------------
// BacktraceMap create offline function.
//-------------------------------------------------------------------------
-BacktraceMap* BacktraceMap::CreateOffline(pid_t pid, const std::vector<backtrace_map_t>& maps,
- const backtrace_stackinfo_t& stack) {
+BacktraceMap* BacktraceMap::CreateOffline(pid_t pid, const std::vector<backtrace_map_t>& maps) {
UnwindStackOfflineMap* map = new UnwindStackOfflineMap(pid);
- if (!map->Build(maps, stack)) {
+ if (!map->Build(maps)) {
delete map;
return nullptr;
}
diff --git a/libbacktrace/UnwindStackMap.h b/libbacktrace/UnwindStackMap.h
index 94cbfb2..ec0d9c1 100644
--- a/libbacktrace/UnwindStackMap.h
+++ b/libbacktrace/UnwindStackMap.h
@@ -76,7 +76,9 @@
bool Build() override;
- bool Build(const std::vector<backtrace_map_t>& maps, const backtrace_stackinfo_t& stack);
+ bool Build(const std::vector<backtrace_map_t>& maps);
+
+ bool CreateProcessMemory(const backtrace_stackinfo_t& stack);
};
#endif // _LIBBACKTRACE_UNWINDSTACK_MAP_H
diff --git a/libbacktrace/include/backtrace/Backtrace.h b/libbacktrace/include/backtrace/Backtrace.h
index 7a37015..a088207 100644
--- a/libbacktrace/include/backtrace/Backtrace.h
+++ b/libbacktrace/include/backtrace/Backtrace.h
@@ -151,6 +151,11 @@
std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames,
std::vector<std::string>* skip_names, BacktraceUnwindError* error = nullptr);
+ static bool UnwindOffline(unwindstack::Regs* regs, BacktraceMap* back_map,
+ const backtrace_stackinfo_t& stack_info,
+ std::vector<backtrace_frame_data_t>* frames,
+ BacktraceUnwindError* error = nullptr);
+
// Get the function name and offset into the function given the pc.
// If the string is empty, then no valid function name was found,
// or the pc is not in any valid map.
diff --git a/libbacktrace/include/backtrace/BacktraceMap.h b/libbacktrace/include/backtrace/BacktraceMap.h
index da54472..473d195 100644
--- a/libbacktrace/include/backtrace/BacktraceMap.h
+++ b/libbacktrace/include/backtrace/BacktraceMap.h
@@ -64,8 +64,7 @@
// is unsupported.
static BacktraceMap* Create(pid_t pid, bool uncached = false);
- static BacktraceMap* CreateOffline(pid_t pid, const std::vector<backtrace_map_t>& maps,
- const backtrace_stackinfo_t& stack);
+ static BacktraceMap* CreateOffline(pid_t pid, const std::vector<backtrace_map_t>& maps);
virtual ~BacktraceMap();