summaryrefslogtreecommitdiffstats
path: root/test/notinheap3.go
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--test/notinheap3.go76
1 files changed, 76 insertions, 0 deletions
diff --git a/test/notinheap3.go b/test/notinheap3.go
new file mode 100644
index 0000000..5ace8d6
--- /dev/null
+++ b/test/notinheap3.go
@@ -0,0 +1,76 @@
+// errorcheck -+ -0 -l -d=wb
+
+// Copyright 2016 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.
+
+// Test write barrier elimination for notinheap.
+
+package p
+
+type t1 struct {
+ x *nih
+ s []nih
+ y [1024]byte // Prevent write decomposition
+}
+
+type t2 struct {
+ x *ih
+ s []ih
+ y [1024]byte
+}
+
+//go:notinheap
+type nih struct {
+ x uintptr
+}
+
+type ih struct { // In-heap type
+ x uintptr
+}
+
+var (
+ v1 t1
+ v2 t2
+
+ v1s []t1
+ v2s []t2
+)
+
+func f() {
+ // Test direct writes
+ v1.x = nil // no barrier
+ v2.x = nil // ERROR "write barrier"
+ v1.s = []nih(nil) // no barrier
+ v2.s = []ih(nil) // ERROR "write barrier"
+}
+
+func g() {
+ // Test aggregate writes
+ v1 = t1{x: nil} // no barrier
+ v2 = t2{x: nil} // ERROR "write barrier"
+}
+
+func h() {
+ // Test copies and appends.
+ copy(v1s, v1s[1:]) // no barrier
+ copy(v2s, v2s[1:]) // ERROR "write barrier"
+ _ = append(v1s, v1s...) // no barrier
+ _ = append(v2s, v2s...) // ERROR "write barrier"
+}
+
+// Slice clearing
+
+var (
+ sliceIH []*ih
+ sliceNIH []*nih
+)
+
+func sliceClear() {
+ for i := range sliceIH {
+ sliceIH[i] = nil // ERROR "write barrier"
+ }
+ for i := range sliceNIH {
+ sliceNIH[i] = nil // no barrier
+ }
+}