cmd/gc: fix escape analysis bug
Was not handling &x.y[0] and &x.y.z correctly where
y is an array or struct-valued field (not a pointer).
R=ken2
CC=golang-dev
https://golang.org/cl/6551059
diff --git a/test/escape4.go b/test/escape4.go
index cc3ac78..83bc8eb 100644
--- a/test/escape4.go
+++ b/test/escape4.go
@@ -37,3 +37,21 @@
// No inline for panic, recover.
func f3() { panic(1) }
func f4() { recover() }
+
+func f5() *byte {
+ type T struct {
+ x [1]byte
+ }
+ t := new(T) // ERROR "new.T. escapes to heap"
+ return &t.x[0] // ERROR "&t.x.0. escapes to heap"
+}
+
+func f6() *byte {
+ type T struct {
+ x struct {
+ y byte
+ }
+ }
+ t := new(T) // ERROR "new.T. escapes to heap"
+ return &t.x.y // ERROR "&t.x.y escapes to heap"
+}
