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-rw-r--r--misc/cgo/testsanitizers/testdata/msan7.go38
1 files changed, 38 insertions, 0 deletions
diff --git a/misc/cgo/testsanitizers/testdata/msan7.go b/misc/cgo/testsanitizers/testdata/msan7.go
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+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// Test passing C struct to exported Go function.
+
+/*
+#include <stdint.h>
+#include <stdlib.h>
+
+// T is a C struct with alignment padding after b.
+// The padding bytes are not considered initialized by MSAN.
+// It is big enough to be passed on stack in C ABI (and least
+// on AMD64).
+typedef struct { char b; uintptr_t x, y; } T;
+
+extern void F(T);
+
+// Use weak as a hack to permit defining a function even though we use export.
+void CF(int x) __attribute__ ((weak));
+void CF(int x) {
+ T *t = malloc(sizeof(T));
+ t->b = (char)x;
+ t->x = x;
+ t->y = x;
+ F(*t);
+}
+*/
+import "C"
+
+//export F
+func F(t C.T) { println(t.b, t.x, t.y) }
+
+func main() {
+ C.CF(C.int(0))
+}