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Split up the stack space tests into their own noinline functions.

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Prevent the compiler from being too smart and allocating a stack buffer
at the beginning of a function.

Bug: http://b/36206043
Test: 32/64-bit dynamic tests pass, static ones still don't
Change-Id: I90c575be43a9dd6c4fefc0d8b514f1ae0405b994
This commit is contained in:
Josh Gao 2017-03-15 19:42:05 -07:00
parent 2390f83da4
commit 61db9ac8da
1 changed files with 26 additions and 17 deletions
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43
tests/pthread_test.cpp
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@ -1886,25 +1886,34 @@ extern _Unwind_Reason_Code FrameCounter(_Unwind_Context* ctx, void* arg);
static volatile bool signal_handler_on_altstack_done;
__attribute__((__noinline__))
static void signal_handler_backtrace() {
// Check if we have enough stack space for unwinding.
int count = 0;
_Unwind_Backtrace(FrameCounter, &count);
ASSERT_GT(count, 0);
}
__attribute__((__noinline__))
static void signal_handler_logging() {
// Check if we have enough stack space for logging.
std::string s(2048, '*');
GTEST_LOG_(INFO) << s;
signal_handler_on_altstack_done = true;
}
__attribute__((__noinline__))
static void signal_handler_snprintf() {
// Check if we have enough stack space for snprintf to a PATH_MAX buffer, plus some extra.
char buf[PATH_MAX + 2048];
ASSERT_GT(snprintf(buf, sizeof(buf), "/proc/%d/status", getpid()), 0);
}
static void SignalHandlerOnAltStack(int signo, siginfo_t*, void*) {
ASSERT_EQ(SIGUSR1, signo);
{
// Check if we have enough stack space for unwinding.
int count = 0;
_Unwind_Backtrace(FrameCounter, &count);
ASSERT_GT(count, 0);
}
{
// Check if we have enough stack space for logging.
std::string s(2048, '*');
GTEST_LOG_(INFO) << s;
signal_handler_on_altstack_done = true;
}
{
// Check if we have enough stack space for snprintf to a PATH_MAX buffer, plus some extra.
char buf[PATH_MAX + 2048];
ASSERT_GT(snprintf(buf, sizeof(buf), "/proc/%d/status", getpid()), 0);
}
signal_handler_backtrace();
signal_handler_logging();
signal_handler_snprintf();
}
TEST(pthread, big_enough_signal_stack) {