forked from OSchip/llvm-project
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* RUN: %clang_msan -g -m64 %s -o %t
|
|
RUN: %clang_msan -g -m64 %s -DBUILD_SO -fPIC -o %t-so.so -shared
|
|
RUN: %run %t 2>&1
|
|
|
|
Regression test for a bug in msan/glibc integration,
|
|
see https://sourceware.org/bugzilla/show_bug.cgi?id=16291
|
|
and https://code.google.com/p/memory-sanitizer/issues/detail?id=44
|
|
*/
|
|
|
|
#ifndef BUILD_SO
|
|
#include <assert.h>
|
|
#include <dlfcn.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
|
|
typedef long *(* get_t)();
|
|
get_t GetTls;
|
|
void *Thread1(void *unused) {
|
|
long uninitialized;
|
|
long *x = GetTls();
|
|
if (*x)
|
|
fprintf(stderr, "bar\n");
|
|
*x = uninitialized;
|
|
fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
|
|
return 0;
|
|
}
|
|
|
|
void *Thread2(void *unused) {
|
|
long *x = GetTls();
|
|
fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
|
|
if (*x)
|
|
fprintf(stderr, "foo\n"); // False negative here.
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
char path[4096];
|
|
snprintf(path, sizeof(path), "%s-so.so", argv[0]);
|
|
int i;
|
|
|
|
void *handle = dlopen(path, RTLD_LAZY);
|
|
if (!handle) fprintf(stderr, "%s\n", dlerror());
|
|
assert(handle != 0);
|
|
GetTls = (get_t)dlsym(handle, "GetTls");
|
|
assert(dlerror() == 0);
|
|
|
|
pthread_t t;
|
|
pthread_create(&t, 0, Thread1, 0);
|
|
pthread_join(t, 0);
|
|
pthread_create(&t, 0, Thread2, 0);
|
|
pthread_join(t, 0);
|
|
return 0;
|
|
}
|
|
#else // BUILD_SO
|
|
__thread long huge_thread_local_array[1 << 17];
|
|
long *GetTls() {
|
|
return &huge_thread_local_array[0];
|
|
}
|
|
#endif
|