cmd/compile: run escape analysis after method wrapper generation

Also modified test/run.go to ignore messages prefixed <autogenerated>
because those cannot be described with "// ERROR ...", and backed out
patch from issue #9537 because it is no longer necessary.  The reasons
described in the 9537 discussion for why escape analysis cannot run
late no longer hold, happily.

Fixes #11053.

Change-Id: Icb14eccdf2e8cde3d0f8fb8a216b765400a96385
Reviewed-on: https://go-review.googlesource.com/11088Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: David Chase <drchase@google.com>

src/cmd/compile/internal/gc/go.go

@@ -644,8 +644,6 @@ var compiling_runtime int
 
 var compiling_wrappers int
 
-var inl_nonlocal int
-
 var use_writebarrier int
 
 var pure_go int

src/cmd/compile/internal/gc/inl.go

@@ -831,12 +831,10 @@ func inlvar(var_ *Node) *Node {
 	n.Name.Curfn = Curfn // the calling function, not the called one
 	n.Addrtaken = var_.Addrtaken
 
-	// Esc pass wont run if we're inlining into a iface wrapper.
-	// Luckily, we can steal the results from the target func.
-	// If inlining a function defined in another package after
-	// escape analysis is done, treat all local vars as escaping.
-	// See issue 9537.
-	if var_.Esc == EscHeap || (inl_nonlocal != 0 && var_.Op == ONAME) {
+	// This may no longer be necessary now that we run escape analysis
+	// after wrapper generation, but for 1.5 this is conservatively left
+	// unchanged.  See bugs 11053 and 9537.
+	if var_.Esc == EscHeap {
 		addrescapes(n)
 	}
 

src/cmd/compile/internal/gc/subr.go

@@ -2494,15 +2494,8 @@ func genwrapper(rcvr *Type, method *Type, newnam *Sym, iface int) {
 	typecheck(&fn, Etop)
 	typechecklist(fn.Nbody, Etop)
 
-	// Set inl_nonlocal to whether we are calling a method on a
-	// type defined in a different package.  Checked in inlvar.
-	if !methodrcvr.Local {
-		inl_nonlocal = 1
-	}
-
 	inlcalls(fn)
-
-	inl_nonlocal = 0
+	escAnalyze(list1(fn), false)
 
 	Curfn = nil
 	funccompile(fn)

test/fixedbugs/issue11053.dir/p.go

+// Copyright 2015 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 p
+
+func Int32(i int32) *int32 {
+	return &i
+}

test/fixedbugs/issue11053.dir/p_test.go

+// Copyright 2015 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
+
+import (
+	"fmt"
+	"p"
+)
+
+type I interface {
+	Add(out *P)
+}
+
+type P struct {
+	V *int32
+}
+
+type T struct{}
+
+var x int32 = 42
+
+func Int32x(i int32) *int32 {
+	return &i
+}
+
+func (T) Add(out *P) {
+	out.V = p.Int32(x) // inlined, p.i.2 moved to heap
+}
+
+var PP P
+var out *P = &PP
+
+func F(s I) interface{} {
+	s.Add(out) // not inlined.
+	return out
+}
+
+var s T
+
+func main() {
+	println("Starting")
+	fmt.Sprint(new(int32))
+	resp := F(s).(*P)
+	println("Before, *resp.V=", *resp.V) // Trashes *resp.V in process of printing.
+	println("After,  *resp.V=", *resp.V)
+	if got, want := *resp.V, int32(42); got != want {
+		fmt.Printf("FAIL, got %v, want %v", got, want)
+	}
+}

test/fixedbugs/issue11053.go

+// rundir
+
+// Copyright 2015 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.
+
+// Issue 11053: Compiler does not run escape analysis on an inlined
+// generated method wrapper.
+
+package ignored

test/fixedbugs/issue11053.out

+Starting
+Before, *resp.V= 42
+After,  *resp.V= 42

test/run.go

@@ -729,6 +729,7 @@ func (t *test) expectedOutput() string {
 func splitOutput(out string) []string {
 	// 6g error messages continue onto additional lines with leading tabs.
 	// Split the output at the beginning of each line that doesn't begin with a tab.
+	// <autogenerated> lines are impossible to match so those are filtered out.
 	var res []string
 	for _, line := range strings.Split(out, "\n") {
 		if strings.HasSuffix(line, "\r") { // remove '\r', output by compiler on windows
@@ -736,7 +737,7 @@ func splitOutput(out string) []string {
 		}
 		if strings.HasPrefix(line, "\t") {
 			res[len(res)-1] += "\n" + line
-		} else if strings.HasPrefix(line, "go tool") {
+		} else if strings.HasPrefix(line, "go tool") || strings.HasPrefix(line, "<autogenerated>") {
 			continue
 		} else if strings.TrimSpace(line) != "" {
 			res = append(res, line)