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// RUN: %clangxx_tsan %s -o %t
// RUN: %deflake %run %t 2>&1 | FileCheck %s
#include <dlfcn.h>
#include <thread>
#import "../test.h"
extern "C" {
int __tsan_get_report_data(void *report, const char **description, int *count,
int *stack_count, int *mop_count, int *loc_count,
int *mutex_count, int *thread_count,
int *unique_tid_count, void **sleep_trace,
unsigned long trace_size);
int __tsan_get_report_tag(void *report, unsigned long *tag);
int __tsan_get_report_mop(void *report, unsigned long idx, int *tid, void **addr,
int *size, int *write, int *atomic, void **trace,
unsigned long trace_size);
}
__attribute__((no_sanitize("thread"), noinline))
void ExternalWrite(void *addr) {
void *kSwiftAccessRaceTag = (void *)0x1;
__tsan_external_write(addr, nullptr, kSwiftAccessRaceTag);
}
int main(int argc, char *argv[]) {
barrier_init(&barrier, 2);
fprintf(stderr, "Start.\n");
// CHECK: Start.
void *opaque_object = malloc(16);
std::thread t1([opaque_object] {
ExternalWrite(opaque_object);
barrier_wait(&barrier);
});
std::thread t2([opaque_object] {
barrier_wait(&barrier);
ExternalWrite(opaque_object);
});
// CHECK: WARNING: ThreadSanitizer: Swift access race
// CHECK: Modifying access of Swift variable at {{.*}} by thread {{.*}}
// CHECK: #0 ExternalWrite
// CHECK: Previous modifying access of Swift variable at {{.*}} by thread {{.*}}
// CHECK: #0 ExternalWrite
// CHECK: SUMMARY: ThreadSanitizer: Swift access race
t1.join();
t2.join();
fprintf(stderr, "Done.\n");
}
extern "C" __attribute__((disable_sanitizer_instrumentation)) void
__tsan_on_report(void *report) {
const char *description;
int count;
int stack_count, mop_count, loc_count, mutex_count, thread_count,
unique_tid_count;
void *sleep_trace[16] = {0};
__tsan_get_report_data(report, &description, &count, &stack_count, &mop_count,
&loc_count, &mutex_count, &thread_count,
&unique_tid_count, sleep_trace, 16);
fprintf(stderr, "report type = '%s', count = %d, mop_count = %d\n", description, count, mop_count);
// CHECK: report type = 'external-race', count = 0, mop_count = 2
unsigned long tag;
__tsan_get_report_tag(report, &tag);
fprintf(stderr, "tag = %ld\n", tag);
// CHECK: tag = 1
int tid, size, write, atomic;
void *addr;
void *trace[16] = {0};
__tsan_get_report_mop(report, /*idx=*/0, &tid, &addr, &size, &write, &atomic,
trace, 16);
fprintf(stderr, "Racy write trace (1 of 2):\n");
for (int i = 0; i < 16 && trace[i]; i++) {
Dl_info info;
dladdr(trace[i], &info);
fprintf(stderr, " %d: frame: %p, function: %p %s\n", i, trace[i],
info.dli_saddr, info.dli_sname);
}
// Ensure ExternalWrite() function is top of trace
// CHECK: 0: frame: 0x{{[0-9a-z]+}}, function: 0x{{[0-9a-z]+}} _Z13ExternalWritePv
}
// CHECK: Done.
// CHECK: ThreadSanitizer: reported 1 warnings
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