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gc: fix parenthesization check

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Cannot use paren field in Node because all
instances of a given symbol name use the same Node.

Fixes #1022.

R=ken2
CC=golang-dev
https://golang.org/cl/2015043
This commit is contained in:
Russ Cox 2010-08-23 23:10:25 -04:00
parent 7ddbe79842
commit b1311cbc93
4 changed files with 38 additions and 16 deletions
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2
src/cmd/gc/go.h
View File

@ -209,7 +209,6 @@ struct Node
uchar dodata; // compile literal assignment as data statement
uchar used;
uchar isddd;
uchar paren; // was parenthesized
uchar pun; // dont registerize variable ONAME
// most nodes
@ -411,6 +410,7 @@ enum
OTINTER,
OTFUNC,
OTARRAY,
OTPAREN,
// misc
ODDD,

35
src/cmd/gc/go.y
View File

@ -58,7 +58,7 @@
%type <node> name_or_type non_expr_type
%type <node> new_name dcl_name oexpr typedclname
%type <node> onew_name
%type <node> osimple_stmt pexpr
%type <node> osimple_stmt pexpr pexpr_no_paren
%type <node> pseudocall range_stmt select_stmt
%type <node> simple_stmt
%type <node> switch_stmt uexpr
@ -812,7 +812,7 @@ pseudocall:
$$->list = $3;
}
pexpr:
pexpr_no_paren:
LLITERAL
{
$$ = nodlit($1);
@ -829,11 +829,6 @@ pexpr:
}
$$ = nod(OXDOT, $1, newname($3));
}
| '(' expr_or_type ')'
{
$$ = $2;
$$->paren++;
}
| pexpr '.' '(' expr_or_type ')'
{
$$ = nod(ODOTTYPE, $1, $4);
@ -873,16 +868,28 @@ pexpr:
if($2 == LBODY)
loophack = 1;
}
| pexpr '{' braced_keyval_list '}'
| pexpr_no_paren '{' braced_keyval_list '}'
{
if($1->paren)
yyerror("cannot parenthesize type in composite literal");
// composite expression
$$ = nod(OCOMPLIT, N, $1);
$$->list = $3;
}
| '(' expr_or_type ')' '{' braced_keyval_list '}'
{
yyerror("cannot parenthesize type in composite literal");
// composite expression
$$ = nod(OCOMPLIT, N, $2);
$$->list = $5;
}
| fnliteral
pexpr:
pexpr_no_paren
| '(' expr_or_type ')'
{
$$ = $2;
}
expr_or_type:
expr
| non_expr_type %prec PreferToRightParen
@ -965,8 +972,7 @@ ntype:
| dotname
| '(' ntype ')'
{
$$ = $2;
$$->paren++;
$$ = nod(OTPAREN, $2, N);
}
non_expr_type:
@ -985,8 +991,7 @@ non_recvchantype:
| dotname
| '(' ntype ')'
{
$$ = $2;
$$->paren++;
$$ = nod(OTPAREN, $2, N);
}
convtype:
@ -1146,7 +1151,7 @@ fndcl:
yyerror("bad receiver in method");
break;
}
if(rcvr->right->paren || (rcvr->right->op == OIND && rcvr->right->left->paren))
if(rcvr->right->op == OTPAREN || (rcvr->right->op == OIND && rcvr->right->left->op == OTPAREN))
yyerror("cannot parenthesize receiver type");
$$ = nod(ODCLFUNC, N, N);

7
src/cmd/gc/print.c
View File

@ -66,6 +66,7 @@ exprfmt(Fmt *f, Node *n, int prec)
case OPLUS:
case ORECV:
case OCONVIFACE:
case OTPAREN:
nprec = 7;
break;
@ -165,6 +166,12 @@ exprfmt(Fmt *f, Node *n, int prec)
fmtprint(f, "[]");
exprfmt(f, n->left, PFIXME);
break;
case OTPAREN:
fmtprint(f, "(");
exprfmt(f, n->left, 0);
fmtprint(f, ")");
break;
case OTMAP:
fmtprint(f, "map[");

10
src/cmd/gc/typecheck.c
View File

@ -169,6 +169,16 @@ reswitch:
goto error;
break;
case OTPAREN:
ok |= Etype;
l = typecheck(&n->left, Etype);
if(l->type == T)
goto error;
n->op = OTYPE;
n->type = l->type;
n->left = N;
break;
case OTARRAY:
ok |= Etype;
t = typ(TARRAY);