[libc++abi] Don't leak in test

[vitalybuka]

Trying to re-enable a test on bots
https://github.com/llvm/llvm-zorg/blob/bb695735dba75e1a5dced13e836f4f46de464bac/zorg/buildbot/builders/sanitizers/buildbot_functions.sh#L443

When we reach terminate() exc pointer is not
on the stack, so lsan correctly report a leak.

[llvmbot]

@llvm/pr-subscribers-libcxxabi

Author: Vitaly Buka (vitalybuka)

Changes

Trying to re-enable few tests on bot
https://github.com/llvm/llvm-zorg/blob/bb695735dba75e1a5dced13e836f4f46de464bac/zorg/buildbot/builders/sanitizers/buildbot_functions.sh#L443

forced_unwind3.pass.cpp does not trigger a leak,
but lsan can have false negatives, and the pattern
is the same.

---

Full diff: https://github.com/llvm/llvm-project/pull/119505.diff

2 Files Affected:

• (modified) libcxxabi/test/forced_unwind2.pass.cpp (+5-1)
• (modified) libcxxabi/test/forced_unwind3.pass.cpp (+5-1)

diff --git a/libcxxabi/test/forced_unwind2.pass.cpp b/libcxxabi/test/forced_unwind2.pass.cpp
index 6ec27e4a655577..8dbc8242b7f2ab 100644
--- a/libcxxabi/test/forced_unwind2.pass.cpp
+++ b/libcxxabi/test/forced_unwind2.pass.cpp
@@ -43,10 +43,14 @@ struct Stop<R (*)(Args...)> {
   }
 };
 
+static void cleanup(_Unwind_Reason_Code, struct _Unwind_Exception* exc) {
+  delete exc;
+}
+
 static void forced_unwind() {
   _Unwind_Exception* exc = new _Unwind_Exception;
   memset(&exc->exception_class, 0, sizeof(exc->exception_class));
-  exc->exception_cleanup = 0;
+  exc->exception_cleanup = cleanup;
   _Unwind_ForcedUnwind(exc, Stop<_Unwind_Stop_Fn>::stop, 0);
   abort();
 }
diff --git a/libcxxabi/test/forced_unwind3.pass.cpp b/libcxxabi/test/forced_unwind3.pass.cpp
index e852ab592292f4..bfb082b702f6a7 100644
--- a/libcxxabi/test/forced_unwind3.pass.cpp
+++ b/libcxxabi/test/forced_unwind3.pass.cpp
@@ -60,10 +60,14 @@ struct Stop<R (*)(Args...)> {
   }
 };
 
+static void cleanup(_Unwind_Reason_Code, struct _Unwind_Exception* exc) {
+  delete exc;
+}
+
 static void forced_unwind() {
   _Unwind_Exception* exc = new _Unwind_Exception;
   memset(&exc->exception_class, 0, sizeof(exc->exception_class));
-  exc->exception_cleanup = 0;
+  exc->exception_cleanup = cleanup;
   _Unwind_ForcedUnwind(exc, Stop<_Unwind_Stop_Fn>::stop, 0);
   abort();
 }

[github-actions]

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