From b68b800189e8b05d9332bcd265f7b75b53863587 Mon Sep 17 00:00:00 2001 From: jimblandy Date: Mon, 29 Mar 2010 18:23:42 +0000 Subject: Breakpad Linux client: Simplify VerifyStackReadWithMultipleThreads unit test. As written, the VerifyStackReadWithMultipleThreads unit test makes assumptions about the layout of thread_function's stack frame. As a result, the test will fail when compiled with some compilers, or built with certain optimization levels. As an extension to C++, the GNU compilers allow you to request that a variable be placed in a specific register. Using this, we can have thread_function put the thread id in place where the test can find it reliably. a=jimblandy, r=nealsid git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@558 4c0a9323-5329-0410-9bdc-e9ce6186880e --- .../minidump_writer/linux_dumper_unittest_helper.cc | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc') diff --git a/src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc b/src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc index f744d72c..388a6580 100644 --- a/src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc +++ b/src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc @@ -37,13 +37,22 @@ #include #include -#pragma GCC optimize ("O0") -void *thread_function(void *data) __attribute__((noinline, optimize("O2"))); +#if defined(__ARM_EABI__) +#define TID_PTR_REGISTER "r3" +#elif defined(__i386) +#define TID_PTR_REGISTER "ecx" +#elif defined(__x86_64) +#define TID_PTR_REGISTER "rcx" +#else +#error This test has not been ported to this platform. +#endif void *thread_function(void *data) { pid_t thread_id = syscall(SYS_gettid); - while (true) ; - asm(""); + register pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = &thread_id; + while (true) + asm("" : : "r" (thread_id_ptr)); + return NULL; } int main(int argc, char *argv[]) { -- cgit v1.2.1