| // RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s | FileCheck -check-prefixes CHECK,WITHOUT %s |
| // RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s -fsanitize=thread | FileCheck -check-prefixes CHECK,TSAN %s |
| |
| // Instrumented function. |
| // TSan inserts calls to __tsan_func_entry() and __tsan_func_exit() to prologue/epilogue. |
| // Non-atomic loads are instrumented with __tsan_readXXX(), atomic loads - with |
| // __tsan_atomicXXX_load(). |
| // |
| // CHECK-LABEL: @instrumented1 |
| // TSAN: call void @__tsan_func_entry |
| // WITHOUT-NOT: call void @__tsan_func_entry |
| // TSAN: call void @__tsan_read4 |
| // WITHOUT-NOT: call void @__tsan_read4 |
| // TSAN: call i32 @__tsan_atomic32_load |
| // WITHOUT-NOT: call i32 @__tsan_atomic32_load |
| // TSAN: call void @__tsan_func_exit |
| // WITHOUT-NOT: call void @__tsan_func_exit |
| // CHECK: ret i32 |
| int instrumented1(int *a, _Atomic int *b) { |
| return *a + *b; |
| } |
| |
| // Function with no_sanitize("thread"). |
| // TSan only inserts instrumentation necessary to prevent false positives: calls are inserted for |
| // function entry/exit and atomics, but not plain memory accesses. |
| // |
| // CHECK-LABEL: @no_false_positives1 |
| // TSAN: call void @__tsan_func_entry |
| // WITHOUT-NOT: call void @__tsan_func_entry |
| // TSAN-NOT: call void @__tsan_read4 |
| // WITHOUT-NOT: call void @__tsan_read4 |
| // TSAN: call i32 @__tsan_atomic32_load |
| // WITHOUT-NOT: call i32 @__tsan_atomic32_load |
| // TSAN: call void @__tsan_func_exit |
| // WITHOUT-NOT: call void @__tsan_func_exit |
| // CHECK: ret i32 |
| __attribute__((no_sanitize("thread"))) int no_false_positives1(int *a, _Atomic int *b) { |
| return *a + *b; |
| } |
| |
| // Function with disable_sanitizer_instrumentation: no instrumentation at all. |
| // |
| // CHECK-LABEL: @no_instrumentation1 |
| // TSAN-NOT: call void @__tsan_func_entry |
| // WITHOUT-NOT: call void @__tsan_func_entry |
| // TSAN-NOT: call void @__tsan_read4 |
| // WITHOUT-NOT: call void @__tsan_read4 |
| // TSAN-NOT: call i32 @__tsan_atomic32_load |
| // WITHOUT-NOT: call i32 @__tsan_atomic32_load |
| // TSAN-NOT: call void @__tsan_func_exit |
| // WITHOUT-NOT: call void @__tsan_func_exit |
| // CHECK: ret i32 |
| __attribute__((disable_sanitizer_instrumentation)) int no_instrumentation1(int *a, _Atomic int *b) { |
| return *a + *b; |
| } |
