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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dlfcn.h>
#include <inttypes.h>
#include <signal.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include <gtest/gtest.h>
#include <android-base/stringprintf.h>
#include <unwindstack/LocalUnwinder.h>
namespace unwindstack {
static std::vector<LocalFrameData>* g_frame_info;
static LocalUnwinder* g_unwinder;
extern "C" void SignalLocalInnerFunction() {
g_unwinder->Unwind(g_frame_info, 256);
}
extern "C" void SignalLocalMiddleFunction() {
SignalLocalInnerFunction();
}
extern "C" void SignalLocalOuterFunction() {
SignalLocalMiddleFunction();
}
static void SignalLocalCallerHandler(int, siginfo_t*, void*) {
SignalLocalOuterFunction();
}
static std::string ErrorMsg(const std::vector<const char*>& function_names,
const std::vector<LocalFrameData>& frame_info) {
std::string unwind;
size_t i = 0;
for (const auto& frame : frame_info) {
unwind += android::base::StringPrintf("#%02zu pc 0x%" PRIx64 " rel_pc 0x%" PRIx64, i++,
frame.pc, frame.rel_pc);
if (frame.map_info != nullptr) {
if (!frame.map_info->name.empty()) {
unwind += " " + frame.map_info->name;
} else {
unwind += android::base::StringPrintf(" 0x%" PRIx64 "-0x%" PRIx64, frame.map_info->start,
frame.map_info->end);
}
if (frame.map_info->offset != 0) {
unwind += android::base::StringPrintf(" offset 0x%" PRIx64, frame.map_info->offset);
}
}
if (!frame.function_name.empty()) {
unwind += " " + frame.function_name;
if (frame.function_offset != 0) {
unwind += android::base::StringPrintf("+%" PRId64, frame.function_offset);
}
}
unwind += '\n';
}
return std::string(
"Unwind completed without finding all frames\n"
" Looking for function: ") +
function_names.front() + "\n" + "Unwind data:\n" + unwind;
}
// This test assumes that this code is compiled with optimizations turned
// off. If this doesn't happen, then all of the calls will be optimized
// away.
extern "C" void LocalInnerFunction(LocalUnwinder* unwinder, bool unwind_through_signal) {
std::vector<LocalFrameData> frame_info;
g_frame_info = &frame_info;
g_unwinder = unwinder;
std::vector<const char*> expected_function_names;
if (unwind_through_signal) {
struct sigaction act, oldact;
memset(&act, 0, sizeof(act));
act.sa_sigaction = SignalLocalCallerHandler;
act.sa_flags = SA_RESTART | SA_ONSTACK;
ASSERT_EQ(0, sigaction(SIGUSR1, &act, &oldact));
raise(SIGUSR1);
ASSERT_EQ(0, sigaction(SIGUSR1, &oldact, nullptr));
expected_function_names = {"LocalOuterFunction", "LocalMiddleFunction",
"LocalInnerFunction", "SignalLocalOuterFunction",
"SignalLocalMiddleFunction", "SignalLocalInnerFunction"};
} else {
ASSERT_TRUE(unwinder->Unwind(&frame_info, 256));
expected_function_names = {"LocalOuterFunction", "LocalMiddleFunction", "LocalInnerFunction"};
}
for (auto& frame : frame_info) {
if (frame.function_name == expected_function_names.back()) {
expected_function_names.pop_back();
if (expected_function_names.empty()) {
break;
}
}
}
ASSERT_TRUE(expected_function_names.empty()) << ErrorMsg(expected_function_names, frame_info);
}
extern "C" void LocalMiddleFunction(LocalUnwinder* unwinder, bool unwind_through_signal) {
LocalInnerFunction(unwinder, unwind_through_signal);
}
extern "C" void LocalOuterFunction(LocalUnwinder* unwinder, bool unwind_through_signal) {
LocalMiddleFunction(unwinder, unwind_through_signal);
}
class LocalUnwinderTest : public ::testing::Test {
protected:
void SetUp() override {
unwinder_.reset(new LocalUnwinder);
ASSERT_TRUE(unwinder_->Init());
}
std::unique_ptr<LocalUnwinder> unwinder_;
};
TEST_F(LocalUnwinderTest, local) {
LocalOuterFunction(unwinder_.get(), false);
}
TEST_F(LocalUnwinderTest, local_signal) {
LocalOuterFunction(unwinder_.get(), true);
}
TEST_F(LocalUnwinderTest, local_multiple) {
ASSERT_NO_FATAL_FAILURE(LocalOuterFunction(unwinder_.get(), false));
ASSERT_NO_FATAL_FAILURE(LocalOuterFunction(unwinder_.get(), true));
ASSERT_NO_FATAL_FAILURE(LocalOuterFunction(unwinder_.get(), false));
ASSERT_NO_FATAL_FAILURE(LocalOuterFunction(unwinder_.get(), true));
}
// This test verifies that doing an unwind before and after a dlopen
// works. It's verifying that the maps read during the first unwind
// do not cause a problem when doing the unwind using the code in
// the dlopen'd code.
TEST_F(LocalUnwinderTest, unwind_after_dlopen) {
// Prime the maps data.
ASSERT_NO_FATAL_FAILURE(LocalOuterFunction(unwinder_.get(), false));
std::string testlib(testing::internal::GetArgvs()[0]);
auto const value = testlib.find_last_of('/');
if (value == std::string::npos) {
testlib = "../";
} else {
testlib = testlib.substr(0, value + 1) + "../";
}
testlib += "libunwindstack_local.so";
void* handle = dlopen(testlib.c_str(), RTLD_NOW);
ASSERT_TRUE(handle != nullptr);
void (*unwind_function)(void*, void*) =
reinterpret_cast<void (*)(void*, void*)>(dlsym(handle, "TestlibLevel1"));
ASSERT_TRUE(unwind_function != nullptr);
std::vector<LocalFrameData> frame_info;
unwind_function(unwinder_.get(), &frame_info);
ASSERT_EQ(0, dlclose(handle));
std::vector<const char*> expected_function_names{"TestlibLevel1", "TestlibLevel2",
"TestlibLevel3", "TestlibLevel4"};
for (auto& frame : frame_info) {
if (frame.function_name == expected_function_names.back()) {
expected_function_names.pop_back();
if (expected_function_names.empty()) {
break;
}
}
}
ASSERT_TRUE(expected_function_names.empty()) << ErrorMsg(expected_function_names, frame_info);
}
} // namespace unwindstack
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