Add ability to skip function name resolution.
Bug: 73558129
Test: New unit tests pass.
Change-Id: I3a6b17d2590aacb367ab3e3a51cc85be73ad64eb
diff --git a/libbacktrace/UnwindStack.cpp b/libbacktrace/UnwindStack.cpp
index 7e2e6d0..0e32e47 100644
--- a/libbacktrace/UnwindStack.cpp
+++ b/libbacktrace/UnwindStack.cpp
@@ -52,6 +52,7 @@
auto process_memory = stack_map->process_memory();
unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(),
regs, stack_map->process_memory());
+ unwinder.SetResolveNames(stack_map->ResolveNames());
if (stack_map->GetJitDebug() != nullptr) {
unwinder.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
}
diff --git a/libbacktrace/include/backtrace/BacktraceMap.h b/libbacktrace/include/backtrace/BacktraceMap.h
index 7b26079..da54472 100644
--- a/libbacktrace/include/backtrace/BacktraceMap.h
+++ b/libbacktrace/include/backtrace/BacktraceMap.h
@@ -154,6 +154,13 @@
const std::vector<std::string>& GetSuffixesToIgnore() { return suffixes_to_ignore_; }
+ // Disabling the resolving of names results in the function name being
+ // set to an empty string and the function offset being set to zero
+ // in the frame data when unwinding.
+ void SetResolveNames(bool resolve) { resolve_names_ = resolve; }
+
+ bool ResolveNames() { return resolve_names_; }
+
protected:
BacktraceMap(pid_t pid);
@@ -164,6 +171,7 @@
pid_t pid_;
std::deque<backtrace_map_t> maps_;
std::vector<std::string> suffixes_to_ignore_;
+ bool resolve_names_ = true;
};
class ScopedBacktraceMapIteratorLock {
diff --git a/libunwindstack/Unwinder.cpp b/libunwindstack/Unwinder.cpp
index d52a0bf..5a4f5e0 100644
--- a/libunwindstack/Unwinder.cpp
+++ b/libunwindstack/Unwinder.cpp
@@ -68,6 +68,10 @@
return;
}
+ if (!resolve_names_) {
+ return;
+ }
+
#if !defined(NO_LIBDEXFILE_SUPPORT)
if (dex_files_ == nullptr) {
return;
@@ -100,7 +104,8 @@
frame->map_flags = map_info->flags;
frame->map_load_bias = elf->GetLoadBias();
- if (!elf->GetFunctionName(func_pc, &frame->function_name, &frame->function_offset)) {
+ if (!resolve_names_ ||
+ !elf->GetFunctionName(func_pc, &frame->function_name, &frame->function_offset)) {
frame->function_name = "";
frame->function_offset = 0;
}
diff --git a/libunwindstack/include/unwindstack/Unwinder.h b/libunwindstack/include/unwindstack/Unwinder.h
index ebe7b0a..5770c1a 100644
--- a/libunwindstack/include/unwindstack/Unwinder.h
+++ b/libunwindstack/include/unwindstack/Unwinder.h
@@ -75,6 +75,10 @@
void SetJitDebug(JitDebug* jit_debug, ArchEnum arch);
+ // Disabling the resolving of names results in the function name being
+ // set to an empty string and the function offset being set to zero.
+ void SetResolveNames(bool resolve) { resolve_names_ = resolve; }
+
#if !defined(NO_LIBDEXFILE_SUPPORT)
void SetDexFiles(DexFiles* dex_files, ArchEnum arch);
#endif
@@ -95,6 +99,7 @@
#if !defined(NO_LIBDEXFILE_SUPPORT)
DexFiles* dex_files_ = nullptr;
#endif
+ bool resolve_names_ = true;
ErrorData last_error_;
};
diff --git a/libunwindstack/tests/UnwinderTest.cpp b/libunwindstack/tests/UnwinderTest.cpp
index 7fbae4c..e44b225 100644
--- a/libunwindstack/tests/UnwinderTest.cpp
+++ b/libunwindstack/tests/UnwinderTest.cpp
@@ -196,6 +196,67 @@
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
+TEST_F(UnwinderTest, multiple_frames_dont_resolve_names) {
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
+
+ regs_.FakeSetPc(0x1000);
+ regs_.FakeSetSp(0x10000);
+ ElfInterfaceFake::FakePushStepData(StepData(0x1102, 0x10010, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0x1202, 0x10020, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
+
+ Unwinder unwinder(64, &maps_, ®s_, process_memory_);
+ unwinder.SetResolveNames(false);
+ unwinder.Unwind();
+ EXPECT_EQ(ERROR_NONE, unwinder.LastErrorCode());
+
+ ASSERT_EQ(3U, unwinder.NumFrames());
+
+ auto* frame = &unwinder.frames()[0];
+ EXPECT_EQ(0U, frame->num);
+ EXPECT_EQ(0U, frame->rel_pc);
+ EXPECT_EQ(0x1000U, frame->pc);
+ EXPECT_EQ(0x10000U, frame->sp);
+ EXPECT_EQ("", frame->function_name);
+ EXPECT_EQ(0U, frame->function_offset);
+ EXPECT_EQ("/system/fake/libc.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x1000U, frame->map_start);
+ EXPECT_EQ(0x8000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+
+ frame = &unwinder.frames()[1];
+ EXPECT_EQ(1U, frame->num);
+ EXPECT_EQ(0x100U, frame->rel_pc);
+ EXPECT_EQ(0x1100U, frame->pc);
+ EXPECT_EQ(0x10010U, frame->sp);
+ EXPECT_EQ("", frame->function_name);
+ EXPECT_EQ(0U, frame->function_offset);
+ EXPECT_EQ("/system/fake/libc.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x1000U, frame->map_start);
+ EXPECT_EQ(0x8000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+
+ frame = &unwinder.frames()[2];
+ EXPECT_EQ(2U, frame->num);
+ EXPECT_EQ(0x200U, frame->rel_pc);
+ EXPECT_EQ(0x1200U, frame->pc);
+ EXPECT_EQ(0x10020U, frame->sp);
+ EXPECT_EQ("", frame->function_name);
+ EXPECT_EQ(0U, frame->function_offset);
+ EXPECT_EQ("/system/fake/libc.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x1000U, frame->map_start);
+ EXPECT_EQ(0x8000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+}
+
TEST_F(UnwinderTest, non_zero_load_bias) {
ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));