more 6g reorg; checkpoint.

typecheck.c is now responsible for all type checking
except for assignment and function argument "..."

R=ken
OCL=32661
CL=32667

src/cmd/8g/gsubr.c

@@ -907,6 +907,8 @@ nodarg(Type *t, int fp)
 		n->class = PPARAM;
 		break;
 	}
+
+	n->typecheck = 1;
 	return n;
 }
 

src/cmd/gc/const.c

@@ -200,8 +200,6 @@ bad:
 		defaultlit(&n, T);
 		*np = n;
 	}
-	yyerror("cannot convert %T constant to %T", n->type, t);
-	n->diag = 1;
 	return;
 }
 
@@ -336,6 +334,9 @@ evconst(Node *n)
 
 	switch(n->op) {
 	case OMAKE:
+	case OMAKEMAP:
+	case OMAKESLICE:
+	case OMAKECHAN:
 		return;
 	}
 
@@ -557,7 +558,7 @@ evconst(Node *n)
 		if(cmpslit(nl, nr) > 0)
 			goto settrue;
 		goto setfalse;
-	case TUP(OADD, CTSTR):
+	case TUP(OADDSTR, CTSTR):
 		len = v.u.sval->len + nr->val.u.sval->len;
 		str = mal(sizeof(*str) + len);
 		str->len = len;
@@ -605,6 +606,7 @@ unary:
 	case TUP(OCONV, CTFLT):
 	case TUP(OCONV, CTSTR):
 	case TUP(OCONV, CTNIL):
+	case TUP(OARRAYBYTESTR, CTNIL):
 		convlit1(&nl, n->type, 1);
 		break;
 

src/cmd/gc/dcl.c

@@ -672,9 +672,9 @@ funclit1(Node *ntype, NodeList *body)
 	for(l=func->cvars; l; l=l->next) {
 		a = l->n;
 		d = oldname(a->sym);
-		addrescapes(d);
 		args = list(args, nod(OADDR, d, N));
 	}
+	typechecklist(args, Erv);
 
 	n = nod(OCALL, clos, N);
 	n->list = args;
@@ -1642,7 +1642,7 @@ embedded(Sym *s)
 NodeList*
 variter(NodeList *vl, Node *nt, NodeList *el)
 {
-	int doexpr;
+	int doexpr, lno;
 	Node *v, *e, *a;
 	Type *tv;
 	NodeList *r;
@@ -1663,23 +1663,37 @@ variter(NodeList *vl, Node *nt, NodeList *el)
 				break;
 			}
 			e = el->n;
-			el = el->next;
 		} else
 			e = N;
 
 		v = vl->n;
 		tv = t;
-		if(t == T) {
+		if(e) {
+			lno = lineno;
+			lineno = v->lineno;
 			typecheck(&e, Erv);
-			defaultlit(&e, T);
+			defaultlit(&e, t);
+			if(t)
+				e = typecheckconv(nil, e, t, 0);
+			if(tv == nil)
 				tv = e->type;
+			if(tv && tv->etype == TNIL) {
+				yyerror("cannot initialize %#N to untyped nil", v);
+				tv = nil;
+			}
+			lineno = lno;
 		}
+
 		a = N;
-		if(e != N || funcdepth > 0)
+		if((e != N && tv != T) || funcdepth > 0)
 			a = nod(OAS, v, e);
 		dodclvar(v, tv, &r);
 		if(a != N)
 			r = list(r, a);
+		if(el) {
+			el->n = e;
+			el = el->next;
+		}
 	}
 	if(el != nil)
 		yyerror("extra expr in var dcl");

src/cmd/gc/go.h

@@ -328,36 +328,41 @@ enum
 	OLITERAL,
 
 	// exprs
-	OADD, OSUB, OOR, OXOR,
+	OADD, OSUB, OOR, OXOR, OADDSTR,
 	OADDR,
 	OANDAND,
+	OAPPENDSTR,
 	OARRAY,
+	OARRAYBYTESTR, OARRAYRUNESTR,
 	OAS, OAS2, OASOP,
 	OBAD,
 	OCALL, OCALLFUNC, OCALLMETH, OCALLINTER,
 	OCAP,
 	OCLOSE,
 	OCLOSED,
-	OCOMPOS, OCOMPSLICE, OCOMPMAP,
-	OCONV, OCONVNOP, OCONVRUNE, OCONVSTRB, OCONVSTRI, OCONVA2S,
+	OCMPIFACE, OCMPSTR,
+	OCOMPLIT, OMAPLIT, OSTRUCTLIT, OARRAYLIT,
+	OCOMPSLICE, OCOMPMAP,
+	OCONV, OCONVNOP, OCONVA2S, OCONVIFACE, OCONVSLICE,
 	ODCL, ODCLFUNC, ODCLFIELD, ODCLARG,
 	ODOT, ODOTPTR, ODOTMETH, ODOTINTER,
 	ODOTTYPE,
 	OEQ, ONE, OLT, OLE, OGE, OGT,
 	OFUNC,
 	OIND,
-	OINDEX, OINDEXSTR, OINDEXMAP, OINDEXARR,
+	OINDEX, OINDEXSTR, OINDEXMAP,
 	OKEY, OPARAM,
 	OLEN,
-	OMAKE,
+	OMAKE, OMAKECHAN, OMAKEMAP, OMAKESLICE,
 	OMUL, ODIV, OMOD, OLSH, ORSH, OAND, OANDNOT,
 	ONEW,
 	ONOT, OCOM, OPLUS, OMINUS,
 	OOROR,
 	OPANIC, OPANICN, OPRINT, OPRINTN,
-	OSEND,
-	OSLICE, OSLICESTR, OSLICEARR,
+	OSEND, OSENDNB,
+	OSLICE, OSLICEARR, OSLICESTR,
 	ORECV,
+	ORUNESTR,
 
 	// stmts
 	OBLOCK,
@@ -470,10 +475,9 @@ enum
 enum
 {
 	Etop = 1<<1,	// evaluated at statement level
-	Elv = 1<<2,	// evaluated in lvalue context
-	Erv = 1<<3,	// evaluated in rvalue context
-	Etype = 1<<4,
-	Ecall = 1<<5,
+	Erv = 1<<2,	// evaluated in value context
+	Etype = 1<<3,
+	Ecall = 1<<4,
 };
 
 #define	BITS	5
@@ -658,6 +662,8 @@ EXTERN	ushort	blockgen;		// max block number
 EXTERN	ushort	block;			// current block number
 EXTERN	int	hasdefer;		// flag that curfn has defer statetment
 
+EXTERN	Node*	curfn;
+
 EXTERN	int	maxround;
 EXTERN	int	widthptr;
 
@@ -986,14 +992,12 @@ NodeList*	ascompatet(int, NodeList*, Type**, int, NodeList**);
 NodeList*	ascompatte(int, Type**, NodeList*, int, NodeList**);
 int	ascompat(Type*, Type*);
 Node*	newcompat(Node*);
-Node*	makecompat(Node*);
 Node*	stringop(Node*, NodeList**);
 Type*	fixmap(Type*);
 Node*	mapop(Node*, NodeList**);
 Type*	fixchan(Type*);
 Node*	chanop(Node*, NodeList**);
-Node*	arrayop(Node*);
-Node*	ifacecvt(Type*, Node*, int);
+Node*	ifacecvt(Type*, Node*, int, NodeList**);
 Node*	ifaceop(Node*);
 int	ifaceas(Type*, Type*, int);
 int	ifaceas1(Type*, Type*, int);
@@ -1011,11 +1015,11 @@ Node*	arraylit(Node*, Node*, NodeList**);
 Node*	maplit(Node*, Node*, NodeList**);
 Node*	selectas(Node*, Node*, NodeList**);
 Node*	old2new(Node*, Type*, NodeList**);
-void	addrescapes(Node*);
 void	heapmoves(void);
 void	walkdeflist(NodeList*);
 void	walkdef(Node*);
 void	typechecklist(NodeList*, int);
+Node*	typecheckconv(Node*, Node*, Type*, int);
 Node*	typecheck(Node**, int);
 
 /*

src/cmd/gc/go.y

@@ -123,6 +123,7 @@ file:
 	{
 		if(debug['f'])
 			frame(1);
+		if(nerrors == 0)
 			fninit($4);
 		if(nsyntaxerrors == 0)
 			testdclstack();
@@ -882,7 +883,7 @@ pexpr:
 |	convtype lbrace braced_keyval_list '}'
 	{
 		// composite expression
-		$$ = nod(OCOMPOS, N, $1);
+		$$ = nod(OCOMPLIT, N, $1);
 		$$->list = $3;
 
 		// If the opening brace was an LBODY,
@@ -894,7 +895,7 @@ pexpr:
 |	pexpr '{' braced_keyval_list '}'
 	{
 		// composite expression
-		$$ = nod(OCOMPOS, N, $1);
+		$$ = nod(OCOMPLIT, N, $1);
 		$$->list = $3;
 	}
 |	fnliteral

src/cmd/gc/print.c

@@ -208,11 +208,12 @@ exprfmt(Fmt *f, Node *n, int prec)
 		exprfmt(f, n->left, 0);
 		break;
 
-	case OCOMPOS:
+	case OCOMPLIT:
 		fmtprint(f, "<compos>");
 		break;
 
 	case ODOT:
+	case ODOTPTR:
 	case ODOTINTER:
 	case ODOTMETH:
 		exprfmt(f, n->left, 7);

src/cmd/gc/sinit.c

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+/*
+ * static initialization
+ */
+
 #include	"go.h"
 
 static struct

src/cmd/gc/subr.c

@@ -1209,6 +1209,14 @@ Nconv(Fmt *fp)
 		goto out;
 	}
 
+	if(fp->flags & FmtSign) {
+		if(n->type == T || n->type->etype == TNIL)
+			fmtprint(fp, "nil");
+		else
+			fmtprint(fp, "%#N (type %T)", n, n->type);
+		goto out;
+	}
+
 	if(fp->flags & FmtSharp) {
 		exprfmt(fp, n, 0);
 		goto out;
@@ -1593,22 +1601,7 @@ eqtype(Type *t1, Type *t2)
 int
 cvttype(Type *dst, Type *src)
 {
-	Sym *ds, *ss;
-	int ret;
-
-	if(eqtype1(dst, src, 0, 0))
-		return 1;
-
-	// Can convert if assignment compatible when
-	// top-level names are ignored.
-	ds = dst->sym;
-	dst->sym = nil;
-	ss = src->sym;
-	src->sym = nil;
-	ret = ascompat(dst, src);
-	dst->sym = ds;
-	src->sym = ss;
-	return ret == 1;
+	return eqtype1(dst, src, 0, 0);
 }
 
 int
@@ -1746,6 +1739,7 @@ noconv(Type *t1, Type *t2)
 void
 argtype(Node *on, Type *t)
 {
+	dowidth(t);
 	if(!subtype(&on->type, t, 0))
 		fatal("argtype: failed %N %T\n", on, t);
 }
@@ -2274,7 +2268,7 @@ saferef(Node *n, NodeList **init)
 		r = nod(OXXX, N, N);
 		*r = *n;
 		r->left = l;
-		typecheck(&r, Elv);
+		typecheck(&r, Erv);
 		walkexpr(&r, init);
 		return r;
 
@@ -2288,7 +2282,7 @@ saferef(Node *n, NodeList **init)
 		walkexpr(&a, init);
 		*init = list(*init, a);
 		r = nod(OIND, l, N);
-		typecheck(&r, Elv);
+		typecheck(&r, Erv);
 		walkexpr(&r, init);
 		return r;
 	}

test/chan/perm.go

@@ -15,10 +15,10 @@ var (
 func main() {
 	cr = c;		// ok
 	cs = c;		// ok
-	c = cr;		// ERROR "illegal types|incompatible"
-	c = cs;		// ERROR "illegal types|incompatible"
-	cr = cs;	// ERROR "illegal types|incompatible"
-	cs = cr;	// ERROR "illegal types|incompatible"
+	c = cr;		// ERROR "illegal types|incompatible|cannot"
+	c = cs;		// ERROR "illegal types|incompatible|cannot"
+	cr = cs;	// ERROR "illegal types|incompatible|cannot"
+	cs = cr;	// ERROR "illegal types|incompatible|cannot"
 
 	c <- 0;		// ok
 	ok := c <- 0;	// ok

test/const1.go

@@ -65,15 +65,15 @@ var (
 func f(int);
 
 func main() {
-	f(Int8);	// ERROR "convert|wrong type"
-	f(Minus1);	// ERROR "convert|wrong type"
-	f(Uint8);	// ERROR "convert|wrong type"
+	f(Int8);	// ERROR "convert|wrong type|cannot"
+	f(Minus1);	// ERROR "convert|wrong type|cannot"
+	f(Uint8);	// ERROR "convert|wrong type|cannot"
 	f(Const);	// OK
-	f(Float32);	// ERROR "convert|wrong type"
-	f(Float);	// ERROR "convert|wrong type"
+	f(Float32);	// ERROR "convert|wrong type|cannot"
+	f(Float);	// ERROR "convert|wrong type|cannot"
 	f(ConstFloat);	// ERROR "truncate"
 	f(ConstFloat - 0.5);	// OK
-	f(Big);	// ERROR "convert|wrong type"
-	f(String);	// ERROR "convert|wrong type"
-	f(Bool);	// ERROR "convert|wrong type"
+	f(Big);	// ERROR "convert|wrong type|cannot"
+	f(String);	// ERROR "convert|wrong type|cannot"
+	f(Bool);	// ERROR "convert|wrong type|cannot"
 }

test/convert3.go

@@ -21,5 +21,5 @@ var g = []int(nil)
 type H *[4]int
 type J []int
 var h H
-var j1 J = h	// ERROR "compat|illegal"
+var j1 J = h	// ERROR "compat|illegal|cannot|cannot"
 var j2 = J(h)

test/convlit.go

@@ -19,11 +19,11 @@ var x7 = float(1e1000);	// ERROR "overflow"
 
 // implicit conversions merit scrutiny
 var s string;
-var bad1 string = 1;	// ERROR "conver|incompatible"
-var bad2 = s + 1;		// ERROR "conver|incompatible"
-var bad3 = s + 'a';	// ERROR "conver|incompatible"
-var bad4 = "a" + 1;	// ERROR "literals|incompatible|convert"
-var bad5 = "a" + 'a';	// ERROR "literals|incompatible|convert"
+var bad1 string = 1;	// ERROR "conver|incompatible|invalid|cannot"
+var bad2 = s + 1;		// ERROR "conver|incompatible|invalid"
+var bad3 = s + 'a';	// ERROR "conver|incompatible|invalid"
+var bad4 = "a" + 1;	// ERROR "literals|incompatible|convert|invalid"
+var bad5 = "a" + 'a';	// ERROR "literals|incompatible|convert|invalid"
 
 var bad6 int = 1.5;	// ERROR "convert|truncate"
 var bad7 int = 1e100;	// ERROR "overflow"

test/convlit1.go

@@ -6,12 +6,12 @@
 
 package main
 
-var a = []int { "a" };	// ERROR "conver|incompatible"
+var a = []int { "a" };	// ERROR "conver|incompatible|cannot"
 var b = int { 1 };	// ERROR "compos"
 
 
 func f() int
 
 func main() {
-	if f < 1 { }	// ERROR "conver|incompatible"
+	if f < 1 { }	// ERROR "conver|incompatible|invalid"
 }

test/fixedbugs/bug022.go

@@ -9,7 +9,7 @@ package main
 func putint(digits *string) {
 	var i byte;
 	i = (*digits)[7];  // compiles
-	i = digits[7];  // ERROR "illegal|is not"
+	i = digits[7];  // ERROR "illegal|is not|invalid"
 }
 
 func main() {

test/fixedbugs/bug062.go

@@ -7,5 +7,5 @@
 package main
 
 func main() {
-  var s string = nil;  // ERROR "illegal|invalid"
+  var s string = nil;  // ERROR "illegal|invalid|cannot"
 }

test/fixedbugs/bug090.go

@@ -38,9 +38,9 @@ func main() {
 	assert(i != f3div2, "i != f3div2");	// ERROR "truncate"
 
 	const g float64 = 1.0;
-	i = g;  // ERROR "convert|incompatible"
+	i = g;  // ERROR "convert|incompatible|cannot"
 
 	const h float64 = 3.14;
-	i = h;  // ERROR "convert|incompatible"
+	i = h;  // ERROR "convert|incompatible|cannot"
 	i = int(h);	// ERROR "truncate"
 }

test/fixedbugs/bug121.go

@@ -10,16 +10,6 @@ type T func()
 
 type I interface {
 	f, g ();
-	h T;  // should only allow FunctionType here
+	h T;  // ERROR "syntax"
 }
 
-type S struct {
-}
-
-func (s *S) f() {}
-func (s *S) g() {}
-func (s *S) h() {}  // here we can't write (s *S) T either
-
-func main() {
-	var i I = new(S);
-}

test/fixedbugs/bug131.go

@@ -8,5 +8,5 @@ package main
 
 func main() {
   const a uint64 = 10;
-  var b int64 = a;	// ERROR "convert"
+  var b int64 = a;	// ERROR "convert|cannot"
 }

test/fixedbugs/bug146.go

@@ -10,5 +10,5 @@ func main() {
 	type Slice []byte;
 	a := [...]byte{ 0 };
 	b := Slice(&a);		// This should be OK.
-	c := Slice(a);		// ERROR "invalid|illegal"
+	c := Slice(a);		// ERROR "invalid|illegal|cannot"
 }

test/fixedbugs/bug170.go

@@ -5,9 +5,10 @@
 // license that can be found in the LICENSE file.
 
 package main
-var v1 = ([10]int)(nil)		// ERROR "illegal|nil|invalid"
-var v2 [10]int = nil		// ERROR "illegal|nil|incompatible"
-var v3 [10]int
+var v1 = ([10]int)(nil);	// ERROR "illegal|nil|invalid"
+var v2 [10]int = nil;		// ERROR "illegal|nil|incompatible"
+var v3 [10]int;
+var v4 = nil;	// ERROR "nil"
 func main() {
 	v3 = nil;		// ERROR "illegal|nil|incompatible"
 }

test/func4.go

@@ -9,6 +9,6 @@ package main
 var notmain func()
 
 func main() {
-	var x = &main;		// ERROR "address of function|invalid"
-	main = notmain;	// ERROR "assign to function|invalid"
+	var x = &main;		// ERROR "address of|invalid"
+	main = notmain;	// ERROR "assign to|invalid"
 }

test/golden.out

@@ -132,13 +132,6 @@ throw: interface conversion
 
 panic PC=xxx
 
-=========== fixedbugs/bug121.go
-fixedbugs/bug121.go:9: syntax error near T
-fixedbugs/bug121.go:20: incomplete type I
-fixedbugs/bug121.go:20: illegal types for operand: AS
-	I
-	*S
-
 =========== fixedbugs/bug148.go
 2 3
 interface is main.T, not main.T·bug148·1

test/interface/pointer.go

@@ -32,6 +32,6 @@ func AddInst(Inst) *Inst {
 func main() {
 	re := new(Regexp);
 	print("call addinst\n");
-	var x Inst = AddInst(new(Start));	// ERROR "illegal|incompatible"
+	var x Inst = AddInst(new(Start));	// ERROR "illegal|incompatible|is not"
 	print("return from  addinst\n");
 }