1
0
mirror of https://github.com/golang/go synced 2024-11-21 18:24:46 -07:00
R=ken
OCL=29651
CL=29653
This commit is contained in:
Russ Cox 2009-05-30 21:18:15 -07:00
parent be63b6dc44
commit d6a9817051
5 changed files with 193 additions and 174 deletions

View File

@ -47,11 +47,11 @@
%type <node> common_dcl Acommon_dcl Bcommon_dcl
%type <node> oarg_type_list arg_type_list_r arg_chunk arg_chunk_list_r arg_type_list
%type <node> Aelse_stmt Belse_stmt
%type <node> complex_stmt compound_stmt ostmt_list
%type <node> stmt_list_r Astmt_list_r Bstmt_list_r
%type <node> complex_stmt compound_stmt switch_body ocaseblock_list ostmt_list
%type <node> caseblock_list_r stmt_list_r Astmt_list_r Bstmt_list_r
%type <node> Astmt Bstmt
%type <node> for_stmt for_body for_header
%type <node> if_stmt if_body if_header select_stmt condition
%type <node> if_stmt if_header select_stmt switch_stmt condition case caseblock
%type <node> simple_stmt osimple_stmt range_stmt semi_stmt
%type <node> expr uexpr pexpr expr_list oexpr oexpr_list expr_list_r
%type <node> exprsym3_list_r exprsym3 pseudocall
@ -511,34 +511,23 @@ simple_stmt:
}
complex_stmt:
LFOR for_stmt
for_stmt
| switch_stmt
| select_stmt
| if_stmt
{
popdcl();
$$ = $2;
$$ = $1;
}
| LSWITCH if_stmt
| if_stmt LELSE Aelse_stmt
{
popdcl();
$$ = $2;
$$->op = OSWITCH;
$$ = $1;
$$->nelse = $3;
}
| LIF if_stmt
{
popdcl();
$$ = $2;
}
| LIF if_stmt LELSE Aelse_stmt
{
popdcl();
$$ = $2;
$$->nelse = $4;
}
| LSELECT select_stmt
{
popdcl();
$$ = $2;
}
| LCASE expr_list ':'
case:
LCASE expr_list ':'
{
// will be converted to OCASE
// right will point to next case
@ -620,11 +609,11 @@ semi_stmt:
{
$$ = nod(ORETURN, $2, N);
}
| LIF if_stmt LELSE Belse_stmt
| if_stmt LELSE Belse_stmt
{
popdcl();
$$ = $2;
$$->nelse = $4;
$$ = $1;
$$->nelse = $3;
}
compound_stmt:
@ -639,6 +628,33 @@ compound_stmt:
popdcl();
}
switch_body:
'{'
{
markdcl();
}
ocaseblock_list '}'
{
$$ = $3;
if($$ == N)
$$ = nod(OEMPTY, N, N);
popdcl();
}
caseblock:
case ostmt_list
{
$$ = $1;
$$->nbody = $2;
}
caseblock_list_r:
caseblock
| caseblock_list_r caseblock
{
$$ = nod(OLIST, $1, $2);
}
range_stmt:
exprsym3_list_r '=' LRANGE expr
{
@ -684,11 +700,14 @@ for_body:
}
for_stmt:
LFOR
{
markdcl();
} for_body
}
for_body
{
$$ = $2;
$$ = $3;
popdcl();
}
/*
@ -722,38 +741,51 @@ if_header:
$$->ntest = $3;
}
if_body:
if_stmt:
LIF
{
markdcl();
}
if_header compound_stmt
{
$$ = $3;
$$->nbody = $4;
// no popdcl; maybe there's an LELSE
}
switch_stmt:
LSWITCH
{
markdcl();
}
if_header
{
Node *n;
n = $1->ntest;
n = $3->ntest;
if(n != N && n->op == OTYPESW)
n = n->left;
else
n = N;
typeswvar = nod(OLIST, typeswvar, n);
} compound_stmt
{
$$ = $1;
$$->nbody = $3;
typeswvar = typeswvar->left;
}
if_stmt:
switch_body
{
markdcl();
} if_body
{
$$ = $2;
$$ = $3;
$$->op = OSWITCH;
$$->nbody = $5;
typeswvar = typeswvar->left;
popdcl();
}
select_stmt:
LSELECT
{
markdcl();
}
compound_stmt
switch_body
{
$$ = nod(OSELECT, $2, N);
$$ = nod(OSELECT, $3, N);
popdcl();
}
/*
@ -1849,6 +1881,15 @@ ostmt_list:
$$ = rev($1);
}
ocaseblock_list:
{
$$ = N;
}
| caseblock_list_r
{
$$ = rev($1);
}
oxdcl_list:
{
$$ = N;

View File

@ -348,8 +348,8 @@ newlabel()
void
casebody(Node *sw)
{
Iter save;
Node *os, *oc, *n, *c;
Iter save, save1;
Node *os, *oc, *n, *n1, *c;
Node *cas, *stat, *def;
Node *go, *br;
int32 lno;
@ -368,70 +368,56 @@ casebody(Node *sw)
oc = N; // last case
br = nod(OBREAK, N, N);
loop:
if(n == N) {
if(oc == N && os != N)
yyerror("first switch statement must be a case");
for(; n != N; n = listnext(&save)) {
lno = setlineno(n);
if(n->op != OXCASE)
fatal("casebody %O", n->op);
n->op = OCASE;
stat = list(stat, br);
cas = list(cas, def);
go = nod(OGOTO, newlabel(), N);
c = n->left;
if(c == N) {
if(def != N)
yyerror("more than one default case");
// reuse original default case
n->right = go;
def = n;
}
sw->nbody = nod(OLIST, rev(cas), rev(stat));
// expand multi-valued cases
for(; c!=N; c=c->right) {
if(c->op != OLIST) {
// reuse original case
n->left = c;
n->right = go;
cas = list(cas, n);
break;
}
cas = list(cas, nod(OCASE, c->left, go));
}
stat = list(stat, nod(OLABEL, go->left, N));
os = N;
for(n1 = listfirst(&save1, &n->nbody); n1 != N; n1 = listnext(&save1)) {
os = n1;
stat = list(stat, n1);
}
// botch - shouldnt fall thru declaration
if(os != N && os->op == OXFALL)
os->op = OFALL;
else
stat = list(stat, br);
}
stat = list(stat, br);
cas = list(cas, def);
sw->nbody = nod(OLIST, rev(cas), rev(stat));
//dump("case", sw->nbody->left);
//dump("stat", sw->nbody->right);
lineno = lno;
return;
}
lno = setlineno(n);
if(n->op != OXCASE) {
stat = list(stat, n);
os = n;
goto next;
}
n->op = OCASE;
if(oc == N && os != N)
yyerror("first switch statement must be a case");
// botch - shouldnt fall thru declaration
if(os != N && os->op == OXFALL)
os->op = OFALL;
else
stat = list(stat, br);
go = nod(OGOTO, newlabel(), N);
c = n->left;
if(c == N) {
if(def != N)
yyerror("more than one default case");
// reuse original default case
n->right = go;
def = n;
}
// expand multi-valued cases
for(; c!=N; c=c->right) {
if(c->op != OLIST) {
// reuse original case
n->left = c;
n->right = go;
cas = list(cas, n);
break;
}
cas = list(cas, nod(OCASE, c->left, go));
}
stat = list(stat, nod(OLABEL, go->left, N));
oc = n;
os = N;
goto next;
next:
n = listnext(&save);
goto loop;
lineno = lno;
}
Case*

View File

@ -1539,8 +1539,8 @@ bad:
void
walkselect(Node *sel)
{
Iter iter;
Node *n, *l, *oc, *on, *r;
Iter iter, iter1;
Node *n, *n1, *l, *oc, *on, *r;
Node *var, *bod, *nbod, *res, *def;
int count, op;
int32 lno;
@ -1552,8 +1552,10 @@ walkselect(Node *sel)
tempname(var, ptrto(types[TUINT8]));
n = listfirst(&iter, &sel->left);
if(n == N || n->op != OXCASE)
yyerror("first select statement must be a case");
if(n == N || n->op == OEMPTY) {
yyerror("empty select");
return;
}
count = 0; // number of cases
res = N; // entire select body
@ -1563,72 +1565,67 @@ walkselect(Node *sel)
for(; n!=N; n=listnext(&iter)) {
setlineno(n);
if(n->op != OXCASE)
fatal("walkselect %O", n->op);
switch(n->op) {
count++;
if(n->left == N) {
op = ORECV; // actual value not used
if(def != N)
yyerror("repeated default; first at %L", def->lineno);
def = n;
} else
op = n->left->op;
nbod = N;
switch(op) {
default:
bod = list(bod, n);
break;
yyerror("select cases must be send, recv or default");
continue;
case OXCASE:
if(n->left == N) {
op = ORECV; // actual value not used
if(def != N)
yyerror("only one default select allowed");
def = n;
} else
op = n->left->op;
nbod = N;
switch(op) {
default:
case OAS:
// convert new syntax (a=recv(chan)) to (recv(a,chan))
l = n->left;
if(l->right == N || l->right->op != ORECV) {
yyerror("select cases must be send, recv or default");
break;
case OAS:
// convert new syntax (a=recv(chan)) to (recv(a,chan))
l = n->left;
if(l->right == N || l->right->op != ORECV) {
yyerror("select cases must be send, recv or default");
break;
}
r = l->right; // rcv
r->right = r->left;
r->left = l->left;
n->left = r;
// convert case x := foo: body
// to case tmp := foo: x := tmp; body.
// if x escapes and must be allocated
// on the heap, this delays the allocation
// until after the select has chosen this branch.
if(n->ninit != N && n->ninit->op == ODCL) {
on = nod(OXXX, N, N);
tempname(on, l->left->type);
on->sym = lookup("!tmpselect!");
r->left = on;
nbod = nod(OAS, l->left, on);
nbod->ninit = n->ninit;
n->ninit = N;
}
// fall through
case OSEND:
case ORECV:
if(oc != N) {
bod = list(bod, nod(OBREAK, N, N));
oc->nbody = rev(bod);
}
oc = selcase(n, var);
res = list(res, oc);
break;
}
bod = nbod;
count++;
r = l->right; // rcv
r->right = r->left;
r->left = l->left;
n->left = r;
// convert case x := foo: body
// to case tmp := foo: x := tmp; body.
// if x escapes and must be allocated
// on the heap, this delays the allocation
// until after the select has chosen this branch.
if(n->ninit != N && n->ninit->op == ODCL) {
on = nod(OXXX, N, N);
tempname(on, l->left->type);
on->sym = lookup("!tmpselect!");
r->left = on;
nbod = nod(OAS, l->left, on);
nbod->ninit = n->ninit;
n->ninit = N;
}
break;
case OSEND:
case ORECV:
break;
}
}
if(oc != N) {
bod = list(bod, nod(OBREAK, N, N));
oc->nbody = rev(bod);
for(n1 = listfirst(&iter1, &n->nbody); n1 != N; n1 = listnext(&iter1))
nbod = list(nbod, n1);
nbod = list(nbod, nod(OBREAK, N, N));
n->nbody = N;
oc = selcase(n, var);
if(oc != N) {
oc->nbody = rev(nbod);
res = list(res, oc);
}
}
setlineno(sel);

View File

@ -104,11 +104,6 @@ BUG should compile
5 7
BUG: should crash
=========== bugs/bug157.go
bugs/bug157.go:20: syntax error near default
bugs/bug157.go:20: first switch statement must be a case
BUG: should compile
=========== fixedbugs/bug016.go
fixedbugs/bug016.go:7: constant -3 overflows uint