From 1376c5a617be5c25655d0d7cb63e3beaa5a6e026 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:20:39 +0200
Subject: Merging upstream version 1.70.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/run-make/foreign-double-unwind/Makefile | 11 +++++++++
 tests/run-make/foreign-double-unwind/foo.cpp  | 33 +++++++++++++++++++++++++++
 tests/run-make/foreign-double-unwind/foo.rs   | 26 +++++++++++++++++++++
 3 files changed, 70 insertions(+)
 create mode 100644 tests/run-make/foreign-double-unwind/Makefile
 create mode 100644 tests/run-make/foreign-double-unwind/foo.cpp
 create mode 100644 tests/run-make/foreign-double-unwind/foo.rs

(limited to 'tests/run-make/foreign-double-unwind')

diff --git a/tests/run-make/foreign-double-unwind/Makefile b/tests/run-make/foreign-double-unwind/Makefile
new file mode 100644
index 000000000..f20fe3ce6
--- /dev/null
+++ b/tests/run-make/foreign-double-unwind/Makefile
@@ -0,0 +1,11 @@
+# ignore-cross-compile
+include ../tools.mk
+
+all: foo
+	$(call RUN,foo) | $(CGREP) -v unreachable
+
+foo: foo.rs $(call NATIVE_STATICLIB,foo)
+	$(RUSTC) $< -lfoo $(EXTRARSCXXFLAGS)
+
+$(TMPDIR)/libfoo.o: foo.cpp
+	$(call COMPILE_OBJ_CXX,$@,$<)
diff --git a/tests/run-make/foreign-double-unwind/foo.cpp b/tests/run-make/foreign-double-unwind/foo.cpp
new file mode 100644
index 000000000..69a8f11c2
--- /dev/null
+++ b/tests/run-make/foreign-double-unwind/foo.cpp
@@ -0,0 +1,33 @@
+#include <cstdio>
+#include <exception>
+
+void println(const char* s) {
+    puts(s);
+    fflush(stdout);
+}
+
+struct outer_exception {};
+struct inner_exception {};
+
+extern "C" {
+    void throw_cxx_exception() {
+        if (std::uncaught_exception()) {
+            println("throwing inner C++ exception");
+            throw inner_exception();
+        } else {
+            println("throwing outer C++ exception");
+            throw outer_exception();
+        }
+    }
+
+    void cxx_catch_callback(void (*cb)()) {
+        try {
+            cb();
+            println("unreachable: callback returns");
+        } catch (outer_exception) {
+            println("unreachable: caught outer exception in catch (...)");
+        } catch (inner_exception) {
+            println("unreachable: caught inner exception in catch (...)");
+        }
+    }
+}
diff --git a/tests/run-make/foreign-double-unwind/foo.rs b/tests/run-make/foreign-double-unwind/foo.rs
new file mode 100644
index 000000000..cae8aa940
--- /dev/null
+++ b/tests/run-make/foreign-double-unwind/foo.rs
@@ -0,0 +1,26 @@
+// Tests that C++ double unwinding through Rust code will be properly guarded
+// against instead of exhibiting undefined behaviour.
+
+#![feature(c_unwind)]
+
+extern "C-unwind" {
+    fn throw_cxx_exception();
+    fn cxx_catch_callback(cb: extern "C-unwind" fn());
+}
+
+struct ThrowOnDrop;
+
+impl Drop for ThrowOnDrop {
+    fn drop(&mut self) {
+        unsafe { throw_cxx_exception() };
+    }
+}
+
+extern "C-unwind" fn test_double_unwind() {
+    let _a = ThrowOnDrop;
+    let _b = ThrowOnDrop;
+}
+
+fn main() {
+    unsafe { cxx_catch_callback(test_double_unwind) };
+}
-- 
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