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Enable weak functions properly.

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There is a check for WEAKS_AVAILABLE that is never set. Change this so
so it is available everywhere except apple/windows.

Add new test to verify that on Android the logStackInternal function is
defined.

Bug: 331489939

Test: All unit tests pass.
Change-Id: Ie982eba30ae421931a62718d39ff1f0c282453db
This commit is contained in:
Christopher Ferris 2024-03-27 16:17:50 -07:00
parent bc3476d5dc
commit bcaeacc686
2 changed files with 44 additions and 2 deletions
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5
libutils/CallStack.cpp
View file

@ -89,7 +89,8 @@ void CallStack::print(Printer& printer) const {
// The following four functions may be used via weak symbol references from libutils.
// Clients assume that if any of these symbols are available, then deleteStack() is.
#ifdef WEAKS_AVAILABLE
// Apple and Windows does not support this, so only compile on other platforms.
#if !defined(__APPLE__) && !defined(_WIN32)
CallStack::CallStackUPtr CallStack::getCurrentInternal(int ignoreDepth) {
CallStack::CallStackUPtr stack(new CallStack());
@ -110,6 +111,6 @@ void CallStack::deleteStack(CallStack* stack) {
delete stack;
}
#endif // WEAKS_AVAILABLE
#endif // !defined(__APPLE__) && !defined(_WIN32)
}; // namespace android

41
libutils/CallStack_test.cpp
View file

@ -18,10 +18,16 @@
#include <thread>
#include <android-base/test_utils.h>
#include <android-base/threads.h>
#include <gtest/gtest.h>
#include <utils/CallStack.h>
#if defined(__ANDROID__)
#include <log/log.h>
#include <log/log_read.h>
#endif
__attribute__((__noinline__)) extern "C" void CurrentCaller(android::String8& backtrace) {
android::CallStack cs;
cs.update();
@ -61,3 +67,38 @@ TEST(CallStackTest, thread_backtrace) {
ASSERT_NE(-1, cs.toString().find("(ThreadBusyWait")) << "Full backtrace:\n" << cs.toString();
}
#if defined(__ANDROID__)
TEST(CallStackTest, log_stack) {
android::CallStack::logStack("callstack_test");
auto logger_list = android_logger_list_open(android_name_to_log_id("main"),
ANDROID_LOG_NONBLOCK, 1000, getpid());
ASSERT_NE(nullptr, logger_list);
std::string log;
while (true) {
log_msg log_msg;
auto ret = android_logger_list_read(logger_list, &log_msg);
if (ret == -EAGAIN) {
break;
}
ASSERT_GT(ret, 0);
if (log_msg.msg() == nullptr) {
continue;
}
// First get the tag.
char* msg = &log_msg.msg()[1];
if (std::string(msg) != "callstack_test") {
continue;
}
// Now move past the tag.
msg = &msg[strlen(msg) + 1];
log += msg;
log += '\n';
}
ASSERT_NE("", log) << "No messages found in the log from the test.";
// Look for a backtrace line such as:
// #00 pc 00000000000536e4 libutils_test (testing::Test::Run()+436)
ASSERT_MATCH(log, "#\\d+ pc \\d+");
android_logger_list_close(logger_list);
}
#endif