| // Test that out-of-scope local variables are ignored by LSan. |
| // RUN: LSAN_BASE="report_objects=1:use_registers=0:use_stacks=1" |
| // RUN: %clangxx_lsan %s -o %t |
| // RUN: LSAN_OPTIONS=$LSAN_BASE not %t 2>&1 | FileCheck %s |
| // RUN: LSAN_OPTIONS=$LSAN_BASE":exitcode=0" %t 2>&1 | FileCheck --check-prefix=CHECK-sanity %s |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| void **pp; |
| |
| // Put pointer far enough on the stack that LSan has space to run in without |
| // overwriting it. |
| // Hopefully the argument p will be passed on a register, saving us from false |
| // negatives. |
| __attribute__((noinline)) |
| void *PutPointerOnStaleStack(void *p) { |
| void *locals[2048]; |
| locals[0] = p; |
| pp = &locals[0]; |
| fprintf(stderr, "Test alloc: %p.\n", locals[0]); |
| return 0; |
| } |
| |
| int main() { |
| PutPointerOnStaleStack(malloc(1337)); |
| return 0; |
| } |
| |
| // This must run after LSan, to ensure LSan didn't overwrite the pointer before |
| // it had a chance to see it. If LSan is invoked with atexit(), this works. |
| // Otherwise, we need a different method. |
| __attribute__((destructor)) |
| void ConfirmPointerHasSurvived() { |
| fprintf(stderr, "Value after LSan: %p.\n", *pp); |
| } |
| // CHECK: Test alloc: [[ADDR:.*]]. |
| // CHECK-sanity: Test alloc: [[ADDR:.*]]. |
| // CHECK: Directly leaked 1337 byte object at [[ADDR]] |
| // CHECK: LeakSanitizer: detected memory leaks |
| // CHECK: SUMMARY: LeakSanitizer: |
| // CHECK-sanity: Value after LSan: [[ADDR]]. |
