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cmd/gc: fix escape analysis bug with variable capture in loops.
Fixes #3975. R=rsc, lvd CC=golang-dev, remy https://golang.org/cl/6475061
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@ -543,6 +543,7 @@ esc(EscState *e, Node *n)
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continue;
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a = nod(OADDR, ll->n->closure, N);
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a->lineno = ll->n->lineno;
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a->escloopdepth = e->loopdepth;
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typecheck(&a, Erv);
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escassign(e, n, a);
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}
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@ -18,15 +18,15 @@ var allptr = make([]*int, 0, 100)
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func noalias(p, q *int, s string) {
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n := len(allptr)
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*p = -(n+1)
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*q = -(n+2)
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allptr = allptr[0:n+2]
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*p = -(n + 1)
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*q = -(n + 2)
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allptr = allptr[0 : n+2]
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allptr[n] = p
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allptr[n+1] = q
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n += 2
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for i := 0; i < n; i++ {
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if allptr[i] != nil && *allptr[i] != -(i+1) {
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println("aliased pointers", -(i+1), *allptr[i], "after", s)
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println("aliased pointers", -(i + 1), *allptr[i], "after", s)
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allptr[i] = nil
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bad = true
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}
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@ -141,15 +141,27 @@ func for_escapes2(x int, y int) (*int, *int) {
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return p[0], p[1]
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}
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func for_escapes3(x int, y int) (*int, *int) {
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var f [2]func() *int
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n := 0
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for i := x; n < 2; i = y {
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p := new(int)
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*p = i
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f[n] = func() *int { return p }
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n++
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}
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return f[0](), f[1]()
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}
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func out_escapes(i int) (x int, p *int) {
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x = i
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p = &x // ERROR "address of out parameter"
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p = &x // ERROR "address of out parameter"
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return
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}
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func out_escapes_2(i int) (x int, p *int) {
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x = i
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return x, &x // ERROR "address of out parameter"
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return x, &x // ERROR "address of out parameter"
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}
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func defer1(i int) (x int) {
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@ -187,6 +199,9 @@ func main() {
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p, q = for_escapes2(103, 104)
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chkalias(p, q, 103, "for_escapes2")
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p, q = for_escapes3(105, 106)
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chk(p, q, 105, "for_escapes3")
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_, p = out_escapes(15)
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_, q = out_escapes(16)
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chk(p, q, 15, "out_escapes")
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@ -540,6 +540,19 @@ func foo74() {
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}
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}
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// issue 3975
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func foo74b() {
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var array [3]func()
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s := []int{3, 2, 1} // ERROR "\[\]int literal does not escape"
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for i, v := range s {
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vv := v // ERROR "moved to heap: vv"
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// actually just escapes its scope
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array[i] = func() { // ERROR "func literal escapes to heap"
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println(vv) // ERROR "&vv escapes to heap"
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}
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}
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}
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func myprint(y *int, x ...interface{}) *int { // ERROR "x does not escape" "leaking param: y"
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return y
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}
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