gc: implicit type bug fix in export data

TBR=lvd
CC=golang-dev
https://golang.org/cl/5644064

src/cmd/gc/fmt.c

@@ -1058,7 +1058,7 @@ exprfmt(Fmt *f, Node *n, int prec)
 	NodeList *l;
 	Type *t;
 
-	while(n && n->implicit)
+	while(n && n->implicit && (n->op == OIND || n->op == OADDR))
 		n = n->left;
 
 	if(n == N)
@@ -1160,13 +1160,13 @@ exprfmt(Fmt *f, Node *n, int prec)
 		return fmtprint(f, "%N{ %,H }", n->right, n->list);
 
 	case OPTRLIT:
-		if (fmtmode == FExp && n->left->right->implicit == Implicit) 
+		if(fmtmode == FExp && n->left->implicit)
 			return fmtprint(f, "%N", n->left);
 		return fmtprint(f, "&%N", n->left);
 
 	case OSTRUCTLIT:
-		if (fmtmode == FExp) {   // requires special handling of field names
-			if(n->right->implicit == Implicit)
+		if(fmtmode == FExp) {   // requires special handling of field names
+			if(n->implicit)
 				fmtstrcpy(f, "{");
 			else 
 				fmtprint(f, "%T{", n->type);
@@ -1194,6 +1194,8 @@ exprfmt(Fmt *f, Node *n, int prec)
 	case OMAPLIT:
 		if(fmtmode == FErr)
 			return fmtprint(f, "%T literal", n->type);
+		if(fmtmode == FExp && n->implicit)
+			return fmtprint(f, "{ %,H }", n->list);
 		return fmtprint(f, "%T{ %,H }", n->type, n->list);
 
 	case OKEY:

src/cmd/gc/go.h

@@ -215,13 +215,6 @@ enum
 	EscNever,
 };
 
-enum
-{
-	Explicit,
-	Implicit,  // don't print in output
-	ImplPtr,   // OIND added by &T{ ... } literal
-};
-
 struct	Node
 {
 	// Tree structure.
@@ -257,7 +250,7 @@ struct	Node
 	uchar	used;
 	uchar	isddd;
 	uchar	readonly;
-	uchar	implicit;	// Explicit, Implicit, ImplPtr. 
+	uchar	implicit;
 	uchar	addrtaken;	// address taken, even if not moved to heap
 	uchar	dupok;	// duplicate definitions ok (for func)
 

src/cmd/gc/go.y

@@ -808,7 +808,7 @@ uexpr:
 			// Special case for &T{...}: turn into (*T){...}.
 			$$ = $2;
 			$$->right = nod(OIND, $$->right, N);
-			$$->right->implicit = ImplPtr;
+			$$->right->implicit = 1;
 		} else {
 			$$ = nod(OADDR, $2, N);
 		}

src/cmd/gc/typecheck.c

@@ -2008,7 +2008,8 @@ pushtype(Node *n, Type *t)
 	
 	if(n->right == N) {
 		n->right = typenod(t);
-		n->right->implicit = 1;
+		n->implicit = 1;  // don't print
+		n->right->implicit = 1;  // * is okay
 	}
 	else if(debug['s']) {
 		typecheck(&n->right, Etype);
@@ -2048,8 +2049,8 @@ typecheckcomplit(Node **np)
 	
 	if(isptr[t->etype]) {
 		// For better or worse, we don't allow pointers as the composite literal type,
-		// except when using the &T syntax, which sets implicit to ImplPtr.
-		if(n->right->implicit == Explicit) {
+		// except when using the &T syntax, which sets implicit on the OIND.
+		if(!n->right->implicit) {
 			yyerror("invalid pointer type %T for composite literal (use &%T instead)", t, t->type);
 			goto error;
 		}

src/cmd/gc/y.tab.h

-/* A Bison parser, made by GNU Bison 2.3.  */
+
+/* A Bison parser, made by GNU Bison 2.4.1.  */
 
 /* Skeleton interface for Bison's Yacc-like parsers in C
    
       Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006
    Free Software Foundation, Inc.
    
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -16,9 +17,7 @@
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* As a special exception, you may create a larger work that contains
    part or all of the Bison parser skeleton and distribute that work
@@ -33,6 +32,7 @@
    This special exception was added by the Free Software Foundation in
    version 2.2 of Bison.  */
 
+
 /* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
@@ -146,22 +146,28 @@
 
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 typedef union YYSTYPE
-#line 28 "go.y"
 {
+
+/* Line 1676 of yacc.c  */
+#line 28 "go.y"
+
 	Node*		node;
 	NodeList*		list;
 	Type*		type;
 	Sym*		sym;
 	struct	Val	val;
 	int		i;
-}
-/* Line 1529 of yacc.c.  */
-#line 160 "y.tab.h"
-	YYSTYPE;
+
+
+
+/* Line 1676 of yacc.c  */
+#line 165 "y.tab.h"
+} YYSTYPE;
+# define YYSTYPE_IS_TRIVIAL 1
 # define yystype YYSTYPE /* obsolescent; will be withdrawn */
 # define YYSTYPE_IS_DECLARED 1
-# define YYSTYPE_IS_TRIVIAL 1
 #endif
 
 extern YYSTYPE yylval;
 
+

test/fixedbugs/bug392.dir/one.go

@@ -36,6 +36,8 @@ func F6(S int) *U {
 	return &U{{S,S}}
 }
 
+// Bug in the fix.
 
+type PB struct { x int }
 
-
+func (t *PB) Reset() { *t = PB{} }

test/fixedbugs/bug392.dir/three.go

+// Copyright 2012 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.
+
+// Use the functions in one.go so that the inlined
+// forms get type-checked.
+
+package three
+
+import "./two"
+
+var x = two.F()
+var v = two.V

test/fixedbugs/bug392.dir/two.go

@@ -19,3 +19,7 @@ func use() {
 	t.M()
 	t.MM()
 }
+
+var V = []one.PB{{}, {}}
+
+func F() *one.PB

test/fixedbugs/bug392.go

-// $G $D/$F.dir/one.go && $G $D/$F.dir/two.go
+// $G $D/$F.dir/one.go && $G $D/$F.dir/two.go && $G $D/$F.dir/three.go
 
 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style