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gc: clean up if grammar

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Fixes #2248.

R=ken2
CC=golang-dev
https://golang.org/cl/4978064
This commit is contained in:
Russ Cox 2011-09-12 15:52:29 -04:00
parent 48e9c771a1
commit 9fc687392c
3 changed files with 37 additions and 16 deletions
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3
src/cmd/gc/go.errors
View File

@ -67,4 +67,7 @@ static struct {
% loadsys package imports LFUNC LNAME '(' ')' '{' LFUNC LNAME
"nested func not allowed",
% loadsys package imports LFUNC LNAME '(' ')' '{' LIF if_header loop_body LELSE ';'
"else must be followed by if or statement block"
};

38
src/cmd/gc/go.y
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@ -57,7 +57,7 @@ static void fixlbrace(int);
%type <node> compound_stmt dotname embed expr complitexpr
%type <node> expr_or_type
%type <node> fndcl fnliteral
%type <node> for_body for_header for_stmt if_header if_stmt non_dcl_stmt
%type <node> for_body for_header for_stmt if_header if_stmt else non_dcl_stmt
%type <node> interfacedcl keyval labelname name
%type <node> name_or_type non_expr_type
%type <node> new_name dcl_name oexpr typedclname
@ -640,6 +640,7 @@ if_header:
$$->ntest = $3;
}
/* IF cond body (ELSE IF cond body)* (ELSE block)? */
if_stmt:
LIF
{
@ -652,9 +653,27 @@ if_stmt:
}
loop_body
{
$3->nbody = $5;
}
else
{
popdcl();
$$ = $3;
$$->nbody = $5;
// no popdcl; maybe there's an LELSE
if($7 != N)
$$->nelse = list1($7);
}
else:
{
$$ = N;
}
| LELSE if_stmt
{
$$ = $2;
}
| LELSE compound_stmt
{
$$ = $2;
}
switch_stmt:
@ -1474,19 +1493,6 @@ non_dcl_stmt:
| switch_stmt
| select_stmt
| if_stmt
{
popdcl();
$$ = $1;
}
| if_stmt LELSE stmt
{
if($3->op != OIF && $3->op != OBLOCK)
yyerror("missing { } after else");
popdcl();
$$ = $1;
$$->nelse = list1($3);
}
| labelname ':'
{
$1 = nod(OLABEL, $1, N);

12
test/syntax/else.go Normal file
View File

@ -0,0 +1,12 @@
// errchk $G $D/$F.go
// Copyright 2011 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
func main() {
if true {
} else ; // ERROR "else must be followed by if or statement block"
}