gc: changes to export format in preparation for inlining.

string literals used as package qualifiers are now prefixed with '@'
which obviates the need for the extra ':' before tags.

R=rsc, gri, lvd
CC=golang-dev
https://golang.org/cl/5129057

src/cmd/gc/esc.c

@@ -88,7 +88,7 @@ escapes(void)
 	if(debug['m']) {
 		for(l=noesc; l; l=l->next)
 			if(l->n->esc == EscNone)
-				warnl(l->n->lineno, "%S %#N does not escape",
+				warnl(l->n->lineno, "%S %#hN does not escape",
 					(l->n->curfn && l->n->curfn->nname) ? l->n->curfn->nname->sym : S,
 					l->n);
 	}
@@ -643,7 +643,7 @@ escwalk(int level, Node *dst, Node *src)
 		if(src->class == PPARAM && leaks && src->esc == EscNone) {
 			src->esc = EscScope;
 			if(debug['m'])
-				warnl(src->lineno, "leaking param: %hN", src);
+				warnl(src->lineno, "leaking param: %#hN", src);
 		}
 		break;
 
@@ -652,7 +652,7 @@ escwalk(int level, Node *dst, Node *src)
 			src->esc = EscHeap;
 			addrescapes(src->left);
 			if(debug['m'])
-				warnl(src->lineno, "%#N escapes to heap", src);
+				warnl(src->lineno, "%#hN escapes to heap", src);
 		}
 		escwalk(level-1, dst, src->left);
 		break;
@@ -671,7 +671,7 @@ escwalk(int level, Node *dst, Node *src)
 		if(leaks) {
 			src->esc = EscHeap;
 			if(debug['m'])
-				warnl(src->lineno, "%#N escapes to heap", src);
+				warnl(src->lineno, "%#hN escapes to heap", src);
 		}
 		break;
 

src/cmd/gc/gen.c

@@ -94,7 +94,7 @@ addrescapes(Node *n)
 			if(!debug['s'])
 				n->esc = EscHeap;
 			if(debug['m'])
-				print("%L: moved to heap: %hN\n", n->lineno, n);
+				print("%L: moved to heap: %#hN\n", n->lineno, n);
 			curfn = oldfn;
 			break;
 		}

src/cmd/gc/go.h

@@ -375,10 +375,10 @@ EXTERN	Sym*	dclstack;
 
 struct	Pkg
 {
-	char*	name;
-	Strlit*	path;
+	char*	name;		// package name
+	Strlit*	path;		// string literal used in import statement
 	Sym*	pathsym;
-	char*	prefix;
+	char*	prefix;		// escaped path for use in symbol table
 	Pkg*	link;
 	char	exported;	// import line written in export data
 	char	direct;	// imported directly
@@ -1130,7 +1130,7 @@ int	Nconv(Fmt *fp);
 int	Oconv(Fmt *fp);
 int	Sconv(Fmt *fp);
 int	Tconv(Fmt *fp);
-int	Tpretty(Fmt *fp, Type *t);
+int	Vconv(Fmt *fp);
 int	Zconv(Fmt *fp);
 Node*	adddot(Node *n);
 int	adddot1(Sym *s, Type *t, int d, Type **save, int ignorecase);
@@ -1348,5 +1348,6 @@ void	zname(Biobuf *b, Sym *s, int t);
 #pragma	varargck	type	"lS"	Sym*
 #pragma	varargck	type	"T"	Type*
 #pragma	varargck	type	"lT"	Type*
+#pragma	varargck	type	"V"	Val*
 #pragma	varargck	type	"Y"	char*
 #pragma	varargck	type	"Z"	Strlit*

src/cmd/gc/go.y

@@ -78,8 +78,6 @@ static void fixlbrace(int);
 %type	<node>	indcl interfacetype structtype ptrtype
 %type	<node>	recvchantype non_recvchantype othertype fnret_type fntype
 
-%type	<val>	hidden_tag
-
 %type	<sym>	hidden_importsym hidden_pkg_importsym
 
 %type	<node>	hidden_constant hidden_literal hidden_dcl
@@ -993,6 +991,16 @@ onew_name:
 
 sym:
 	LNAME
+|	hidden_importsym
+
+hidden_importsym:
+	'@' LLITERAL '.' LNAME
+	{
+		if($2.u.sval->len == 0)
+			$$ = pkglookup($4->name, importpkg);
+		else
+			$$ = pkglookup($4->name, mkpkg($2.u.sval));
+	}
 
 name:
 	sym	%prec NotParen
@@ -1826,12 +1834,12 @@ hidden_opt_sym:
 	}
 
 hidden_dcl:
-	hidden_opt_sym hidden_type hidden_tag
+	hidden_opt_sym hidden_type oliteral
 	{
 		$$ = nod(ODCLFIELD, $1, typenod($2));
 		$$->val = $3;
 	}
-|	hidden_opt_sym LDDD hidden_type hidden_tag
+|	hidden_opt_sym LDDD hidden_type oliteral
 	{
 		Type *t;
 		
@@ -1844,12 +1852,12 @@ hidden_dcl:
 	}
 
 hidden_structdcl:
-	sym hidden_type hidden_tag
+	sym hidden_type oliteral
 	{
 		$$ = nod(ODCLFIELD, newname($1), typenod($2));
 		$$->val = $3;
 	}
-|	'?' hidden_type hidden_tag
+|	'?' hidden_type oliteral
 	{
 		Sym *s;
 
@@ -1863,24 +1871,11 @@ hidden_structdcl:
 		$$->val = $3;
 	}
 
-hidden_tag:
-	{
-		$$.ctype = CTxxx;
-	}
-|	':' LLITERAL	// extra colon avoids conflict with "" looking like beginning of "".typename
-	{
-		$$ = $2;
-	}
-
 hidden_interfacedcl:
 	sym '(' ohidden_funarg_list ')' ohidden_funres
 	{
 		$$ = nod(ODCLFIELD, newname($1), typenod(functype(fakethis(), $3, $5)));
 	}
-|	hidden_importsym '(' ohidden_funarg_list ')' ohidden_funres
-	{
-		$$ = nod(ODCLFIELD, newname($1), typenod(functype(fakethis(), $3, $5)));
-	}
 
 ohidden_funres:
 	{
@@ -1931,18 +1926,6 @@ hidden_constant:
 		$$ = nodcplxlit($2->val, $4->val);
 	}
 
-hidden_importsym:
-	LLITERAL '.' sym
-	{
-		Pkg *p;
-
-		if($1.u.sval->len == 0)
-			p = importpkg;
-		else
-			p = mkpkg($1.u.sval);
-		$$ = pkglookup($3->name, p);
-	}
-
 hidden_pkg_importsym:
 	hidden_importsym
 	{

src/cmd/gc/lex.c

@@ -198,6 +198,7 @@ main(int argc, char *argv[])
 	fmtinstall('J', Jconv);		// all the node flags
 	fmtinstall('S', Sconv);		// sym pointer
 	fmtinstall('T', Tconv);		// type pointer
+	fmtinstall('V', Vconv);		// Val pointer
 	fmtinstall('N', Nconv);		// node pointer
 	fmtinstall('Z', Zconv);		// escaped string
 	fmtinstall('L', Lconv);		// line number

src/cmd/gc/print.c

@@ -21,11 +21,22 @@ exprlistfmt(Fmt *f, NodeList *l)
 	}
 }
 
+void
+stmtlistfmt(Fmt *f, NodeList *l)
+{
+	for(; l; l=l->next) {
+		fmtprint(f, " %#N", l->n);
+		if(l->next)
+			fmtprint(f, ";");
+	}
+}
+
 void
 exprfmt(Fmt *f, Node *n, int prec)
 {
 	int nprec;
 	char *p;
+	NodeList *l;
 
 	nprec = 0;
 	if(n == nil) {
@@ -107,6 +118,7 @@ exprfmt(Fmt *f, Node *n, int prec)
 	case OGE:
 	case OGT:
 	case ONE:
+	case OCMPSTR:
 		nprec = 4;
 		break;
 
@@ -269,6 +281,8 @@ exprfmt(Fmt *f, Node *n, int prec)
 		break;
 
 	case OADD:
+	case OADDSTR:
+	case OAND:
 	case OANDAND:
 	case OANDNOT:
 	case ODIV:
@@ -292,6 +306,12 @@ exprfmt(Fmt *f, Node *n, int prec)
 		exprfmt(f, n->right, nprec+1);
 		break;
 
+	case OCMPSTR:
+		exprfmt(f, n->left, nprec);
+		fmtprint(f, " %#O ", n->etype);
+		exprfmt(f, n->right, nprec+1);
+		break;
+
 	case OADDR:
 	case OCOM:
 	case OIND:
@@ -306,7 +326,13 @@ exprfmt(Fmt *f, Node *n, int prec)
 		break;
 
 	case OCLOSURE:
-		fmtprint(f, "func literal");
+		if(f->flags & FmtShort) {
+			fmtprint(f, "func literal", n->type);
+		} else {
+			fmtprint(f, "func %hhT {", n->type);
+			stmtlistfmt(f, n->nbody);
+			fmtprint(f, " }");
+		}
 		break;
 
 	case OCOMPLIT:
@@ -314,18 +340,18 @@ exprfmt(Fmt *f, Node *n, int prec)
 		break;
 	
 	case OARRAYLIT:
-		if(isslice(n->type))
-			fmtprint(f, "slice literal");
-		else
-			fmtprint(f, "array literal");
-		break;
-	
 	case OMAPLIT:
-		fmtprint(f, "map literal");
-		break;
-	
 	case OSTRUCTLIT:
-		fmtprint(f, "struct literal");
+		if(f->flags & FmtShort) {
+			fmtprint(f, "%#hhT literal", n->type);
+		} else {
+			fmtprint(f, "%#hhT{", n->type);
+			for (l=n->list; l; l=l->next) {
+				fmtprint(f, " %#N:%#N", l->n->left, l->n->right);
+				if (l->next) fmtprint(f, ",");
+			}
+			fmtprint(f, " }");
+		}
 		break;
 
 	case OXDOT:
@@ -479,6 +505,119 @@ exprfmt(Fmt *f, Node *n, int prec)
 	case ODEFER:
 		fmtprint(f, "defer %#N", n->left);
 		break;
+
+	case OIF:
+		if (n->ninit && n->ninit->next) {
+			fmtprint(f, "{");
+			stmtlistfmt(f, n->ninit);
+			fmtprint(f, "; ");
+		}
+		fmtstrcpy(f, "if ");
+		if (n->ninit && !n->ninit->next)
+			fmtprint(f, "%#N; ", n->ninit->n);
+		fmtprint(f, "%#N {", n->ntest);
+		stmtlistfmt(f, n->nbody);
+		if (n->nelse) {
+			fmtprint(f, "} else {");
+			stmtlistfmt(f, n->nelse);
+		}
+		fmtprint(f, "}");
+		if (n->ninit && n->ninit->next)
+			fmtprint(f, "}");
+		break;
+
+	case OFOR:
+		if (n->ninit && n->ninit->next) {
+			fmtprint(f, "{");
+			stmtlistfmt(f, n->ninit);
+			fmtprint(f, "; ");
+		}
+		fmtstrcpy(f, "for");
+		if (n->ninit && !n->ninit->next)
+			fmtprint(f, " %#N;", n->ninit->n);
+		else if (n->ntest || n->nincr)
+			fmtstrcpy(f, " ;");
+		if (n->ntest)
+			fmtprint(f, "%#N", n->ntest);
+		if (n->nincr)
+			fmtprint(f, "; %#N", n->nincr);
+		else if (n->ninit && !n->ninit->next)
+			fmtstrcpy(f, " ;");
+		fmtstrcpy(f, " {");
+		stmtlistfmt(f, n->nbody);
+		fmtprint(f, "}");
+		if (n->ninit && n->ninit->next)
+			fmtprint(f, "}");
+		break;
+	
+	case ORANGE:
+		if (n->ninit) {
+			fmtprint(f, "{");
+			stmtlistfmt(f, n->ninit);
+			fmtprint(f, "; ");
+		}
+		fmtprint(f, "for ");
+		exprlistfmt(f, n->list);
+		fmtprint(f, " = range %#N {", n->right);
+		stmtlistfmt(f, n->nbody);
+		fmtprint(f, "}");
+		if (n->ninit)
+			fmtprint(f, "}");
+		break;
+
+	case OSWITCH:
+		if (n->ninit && n->ninit->next) {
+			fmtprint(f, "{");
+			stmtlistfmt(f, n->ninit);
+			fmtprint(f, "; ");
+		}
+		fmtstrcpy(f, "select");
+		if (n->ninit && !n->ninit->next)
+			fmtprint(f, " %#N;", n->ninit->n);
+		if (n->ntest)
+			fmtprint(f, "%#N", n->ntest);
+		fmtstrcpy(f, " {");
+		for(l=n->list; l; l=l->next) {
+			if (l->n->list) {
+				fmtprint(f, " case ");
+				exprlistfmt(f, l->n->list);
+			} else {
+				fmtprint(f, " default");
+			}
+			fmtstrcpy(f, ":");
+			stmtlistfmt(f, l->n->nbody);
+			if (l->next)
+				fmtprint(f, ";");
+		}
+		fmtprint(f, " }");
+		if (n->ninit)
+			fmtprint(f, "}");
+		break;
+
+
+	case OSELECT:
+		if (n->ninit) {
+			fmtprint(f, "{");
+			stmtlistfmt(f, n->ninit);
+			fmtprint(f, "; ");
+		}
+		fmtstrcpy(f, "select {");
+		for(l=n->list; l; l=l->next) {
+			if (l->n->list) {
+				fmtprint(f, " case ");
+				exprlistfmt(f, l->n->list);
+			} else {
+				fmtprint(f, " default");
+			}
+			fmtstrcpy(f, ":");
+			stmtlistfmt(f, l->n->nbody);
+			if (l->next)
+				fmtprint(f, ";");
+		}
+		fmtprint(f, " }");
+		if (n->ninit)
+			fmtprint(f, "}");
+		break;
 	}
 
 	if(prec > nprec)

src/cmd/gc/subr.c

@@ -768,6 +768,10 @@ dodump(Node *n, int dep)
 		dodump(n->right, dep+1);
 		break;
 
+	case OLITERAL:
+		print("%N v(%V)\n", n, &n->val);
+		break;
+
 	case OTYPE:
 		print("%O %S type=%T\n", n->op, n->sym, n->type);
 		if(n->type == T && n->ntype) {
@@ -870,11 +874,38 @@ dump(char *s, Node *n)
 	dodump(n, 1);
 }
 
+int
+Vconv(Fmt *fp)
+{
+	Val *v;
+
+	v = va_arg(fp->args, Val*);
+ 
+	switch(v->ctype) {
+	case CTINT:
+		return fmtprint(fp,  "%B", v->u.xval);
+	case CTFLT:
+		return fmtprint(fp,  "%g", mpgetflt(v->u.fval));
+	case CTCPLX:
+		return fmtprint(fp,  "(%g+%gi)",
+				mpgetflt(&v->u.cval->real),
+				mpgetflt(&v->u.cval->imag));
+	case CTSTR:
+		return fmtprint(fp,  "\"%Z\"", v->u.sval);
+	case CTBOOL:
+		return fmtprint(fp,  "%d", v->u.bval);
+	case CTNIL:
+		return fmtprint(fp,  "nil");
+	}
+	return fmtprint(fp,  "<%d>", v->ctype);
+}
+
 static char*
 goopnames[] =
 {
 	[OADDR]		= "&",
 	[OADD]		= "+",
+	[OADDSTR]	= "+",
 	[OANDAND]	= "&&",
 	[OANDNOT]	= "&^",
 	[OAND]		= "&",
@@ -1165,44 +1196,42 @@ Jconv(Fmt *fp)
 	return 0;
 }
 
+// Flags for %S
+// 'h' FmtShort -> just print the name
+// '#' FmtSharp -> qualify with package prefix or @"path", depending on global flag packagequotes.
+//    (automatic when global flag exporting is set)
+// 'l' FmtLong  -> qualify with package name or "path" (automatic when global flag 
+//    longsymnames is set (by typehash) or sym is not in localpkg)
 int
 Sconv(Fmt *fp)
 {
 	Sym *s;
 
 	s = va_arg(fp->args, Sym*);
-	if(s == S) {
-		fmtstrcpy(fp, "<S>");
-		return 0;
-	}
+	if(s == S)
+		return fmtstrcpy(fp, "<S>");
 
 	if(fp->flags & FmtShort)
 		goto shrt;
 
 	if(exporting || (fp->flags & FmtSharp)) {
 		if(packagequotes)
-			fmtprint(fp, "\"%Z\"", s->pkg->path);
+			return fmtprint(fp, "@\"%Z\".%s", s->pkg->path, s->name);
 		else
-			fmtprint(fp, "%s", s->pkg->prefix);
-		fmtprint(fp, ".%s", s->name);
-		return 0;
+			return fmtprint(fp, "%s.%s", s->pkg->prefix, s->name);
 	}
 
 	if(s->pkg && s->pkg != localpkg || longsymnames || (fp->flags & FmtLong)) {
 		// This one is for the user.  If the package name
 		// was used by multiple packages, give the full
 		// import path to disambiguate.
-		if(erroring && pkglookup(s->pkg->name, nil)->npkg > 1) {
-			fmtprint(fp, "\"%Z\".%s", s->pkg->path, s->name);
-			return 0;
-		}
-		fmtprint(fp, "%s.%s", s->pkg->name, s->name);
-		return 0;
+		if(erroring && pkglookup(s->pkg->name, nil)->npkg > 1)
+			return fmtprint(fp, "\"%Z\".%s", s->pkg->path, s->name);
+		return fmtprint(fp, "%s.%s", s->pkg->name, s->name);
 	}
 
 shrt:
-	fmtstrcpy(fp, s->name);
-	return 0;
+	return fmtstrcpy(fp, s->name);
 }
 
 static char*
@@ -1231,7 +1260,11 @@ basicnames[] =
 	[TBLANK]	= "blank",
 };
 
-int
+// Global flag exporting 
+// Global flag noargnames
+// 'h' FmtShort
+// 'l' FmtLong
+static int
 Tpretty(Fmt *fp, Type *t)
 {
 	Type *t1;
@@ -1255,9 +1288,7 @@ Tpretty(Fmt *fp, Type *t)
 				fmtprint(fp, "%hS", s);
 			else
 				fmtprint(fp, "%S", s);
-			if(s->pkg != localpkg)
-				return 0;
-			if(t->vargen)
+			if(s->pkg == localpkg && t->vargen)
 				fmtprint(fp, "·%d", t->vargen);
 			return 0;
 		}
@@ -1401,8 +1432,6 @@ Tpretty(Fmt *fp, Type *t)
 			fmtprint(fp, "%T", t->type);
 		if(t->note) {
 			fmtprint(fp, " ");
-			if(exporting)
-				fmtprint(fp, ":");
 			fmtprint(fp, "\"%Z\"", t->note);
 		}
 		return 0;
@@ -1416,35 +1445,45 @@ Tpretty(Fmt *fp, Type *t)
 	
 	case TUNSAFEPTR:
 		if(exporting)
-			return fmtprint(fp, "\"unsafe\".Pointer");
+			return fmtprint(fp, "@\"unsafe\".Pointer");
 		return fmtprint(fp, "unsafe.Pointer");
+	default:
+		if(exporting)
+			fatal("missing %E case during export", t->etype);
+		// Don't know how to handle - fall back to detailed prints.
+		return fmtprint(fp, "%E <%S> %T", t->etype, t->sym, t->type);
 	}
 
-	// Don't know how to handle - fall back to detailed prints.
+	fatal("not reached");
 	return -1;
 }
 
+// %T flags:
+//  '#'   FmtSharp   -> 'exporting' mode global flag, affects Tpretty and Sconv
+//  '-'   FmtLeft    -> 'noargnames' global flag, affects Tpretty
+//  'h'   FmtShort   -> handled by Tpretty
+//  'l'   FmtLong    -> handled by Tpretty
 int
 Tconv(Fmt *fp)
 {
-	Type *t, *t1;
-	int r, et, sharp, minus;
-
-	sharp = (fp->flags & FmtSharp);
-	minus = (fp->flags & FmtLeft);
-	fp->flags &= ~(FmtSharp|FmtLeft);
+	Type *t;
+	int r,sharp, minus, sf;
 
 	t = va_arg(fp->args, Type*);
 	if(t == T)
 		return fmtstrcpy(fp, "<T>");
 
-	t->trecur++;
-	if(t->trecur > 5) {
-		fmtprint(fp, "...");
-		goto out;
+	if(t->trecur > 4) {
+		return fmtstrcpy(fp, "...");
 	}
 
-	if(!debug['t']) {
+	t->trecur++;
+
+	sharp = (fp->flags & FmtSharp);
+	minus = (fp->flags & FmtLeft);
+	sf = fp->flags;
+	fp->flags &= ~(FmtSharp|FmtLeft);
+
 	if(sharp)
 		exporting++;
 	if(minus)
@@ -1454,77 +1493,10 @@ Tconv(Fmt *fp)
 		exporting--;
 	if(minus)
 		noargnames--;
-		if(r >= 0) {
-			t->trecur--;
-			return 0;
-		}
-	}
-
-	if(sharp || exporting)
-		fatal("missing %E case during export", t->etype);
-
-	et = t->etype;
-	fmtprint(fp, "%E ", et);
-	if(t->sym != S)
-		fmtprint(fp, "<%S>", t->sym);
 
-	switch(et) {
-	default:
-		if(t->type != T)
-			fmtprint(fp, " %T", t->type);
-		break;
-
-	case TFIELD:
-		fmtprint(fp, "%T", t->type);
-		break;
-
-	case TFUNC:
-		if(fp->flags & FmtLong)
-			fmtprint(fp, "%d%d%d(%lT,%lT)%lT",
-				t->thistuple, t->intuple, t->outtuple,
-				t->type, t->type->down->down, t->type->down);
-		else
-			fmtprint(fp, "%d%d%d(%T,%T)%T",
-				t->thistuple, t->intuple, t->outtuple,
-				t->type, t->type->down->down, t->type->down);
-		break;
-
-	case TINTER:
-		fmtprint(fp, "{");
-		if(fp->flags & FmtLong)
-			for(t1=t->type; t1!=T; t1=t1->down)
-				fmtprint(fp, "%lT;", t1);
-		fmtprint(fp, "}");
-		break;
-
-	case TSTRUCT:
-		fmtprint(fp, "{");
-		if(fp->flags & FmtLong)
-			for(t1=t->type; t1!=T; t1=t1->down)
-				fmtprint(fp, "%lT;", t1);
-		fmtprint(fp, "}");
-		break;
-
-	case TMAP:
-		fmtprint(fp, "[%T]%T", t->down, t->type);
-		break;
-
-	case TARRAY:
-		if(t->bound >= 0)
-			fmtprint(fp, "[%d]%T", t->bound, t->type);
-		else
-			fmtprint(fp, "[]%T", t->type);
-		break;
-
-	case TPTR32:
-	case TPTR64:
-		fmtprint(fp, "%T", t->type);
-		break;
-	}
-
-out:
+	fp->flags = sf;
 	t->trecur--;
-	return 0;
+	return r;
 }
 
 int
@@ -1541,11 +1513,11 @@ Nconv(Fmt *fp)
 
 	if(fp->flags & FmtSign) {
 		if(n->type == T)
-			fmtprint(fp, "%#N", n);
+			fmtprint(fp, "%#hN", n);
 		else if(n->type->etype == TNIL)
 			fmtprint(fp, "nil");
 		else
-			fmtprint(fp, "%#N (type %T)", n, n->type);
+			fmtprint(fp, "%#hN (type %T)", n, n->type);
 		goto out;
 	}
 

src/lib9/fmt/fmtprint.c

@@ -21,31 +21,19 @@
 #include "fmtdef.h"
 
 /*
- * format a string into the output buffer
- * designed for formats which themselves call fmt,
- * but ignore any width flags
+ * Format a string into the output buffer.
+ * Designed for formats which themselves call fmt.
+ * Flags, precision and width are preserved.
  */
 int
 fmtprint(Fmt *f, char *fmt, ...)
 {
-	va_list va;
 	int n;
+	va_list va;
 
-	f->flags = 0;
-	f->width = 0;
-	f->prec = 0;
-	VA_COPY(va, f->args);
-	VA_END(f->args);
-	va_start(f->args, fmt);
-	n = dofmt(f, fmt);
-	va_end(f->args);
-	f->flags = 0;
-	f->width = 0;
-	f->prec = 0;
-	VA_COPY(f->args,va);
-	VA_END(va);
-	if(n >= 0)
-		return 0;
+	va_start(va, fmt);
+	n = fmtvprint(f, fmt, va);
+	va_end(va);
 	return n;
 }
 

src/lib9/fmt/fmtvprint.c

@@ -22,31 +22,31 @@
 
 
 /*
- * format a string into the output buffer
- * designed for formats which themselves call fmt,
- * but ignore any width flags
+ * Format a string into the output buffer.
+ * Designed for formats which themselves call fmt.
+ * Flags, precision and width are preserved.
  */
 int
 fmtvprint(Fmt *f, char *fmt, va_list args)
 {
 	va_list va;
-	int n;
+	int n, w, p;
+	unsigned long fl;
 
-	f->flags = 0;
-	f->width = 0;
-	f->prec = 0;
-	VA_COPY(va,f->args);
+	w = f->width;
+	p = f->prec;
+	fl = f->flags;
+	VA_COPY(va, f->args);
 	VA_END(f->args);
-	VA_COPY(f->args,args);
+	VA_COPY(f->args, args);
 	n = dofmt(f, fmt);
-	f->flags = 0;
-	f->width = 0;
-	f->prec = 0;
 	VA_END(f->args);
-	VA_COPY(f->args,va);
+	VA_COPY(f->args, va);
 	VA_END(va);
+	f->width = w;
+	f->prec = p;
+	f->flags = fl;
 	if(n >= 0)
 		return 0;
 	return n;
 }
-

src/pkg/go/types/gcimporter.go

@@ -142,6 +142,34 @@ func GcImporter(imports map[string]*ast.Object, path string) (pkg *ast.Object, e
 	return
 }
 
+// Declare inserts a named object of the given kind in scope.
+func (p *gcParser) declare(scope *ast.Scope, kind ast.ObjKind, name string) *ast.Object {
+	// a type may have been declared before - if it exists
+	// already in the respective package scope, return that
+	// type
+	if kind == ast.Typ {
+		if obj := scope.Lookup(name); obj != nil {
+			assert(obj.Kind == ast.Typ)
+			return obj
+		}
+	}
+
+	// any other object must be a newly declared object -
+	// create it and insert it into the package scope
+	obj := ast.NewObj(kind, name)
+	if scope.Insert(obj) != nil {
+		p.errorf("already declared: %v %s", kind, obj.Name)
+	}
+
+	// a new type object is a named type and may be referred
+	// to before the underlying type is known - set it up
+	if kind == ast.Typ {
+		obj.Type = &Name{Obj: obj}
+	}
+
+	return obj
+}
+
 // ----------------------------------------------------------------------------
 // Error handling
 
@@ -245,38 +273,14 @@ func (p *gcParser) parseDotIdent() string {
 	return ident
 }
 
-// ExportedName = ImportPath "." dotIdentifier .
+// ExportedName = "@" ImportPath "." dotIdentifier .
 //
-func (p *gcParser) parseExportedName(kind ast.ObjKind) *ast.Object {
+func (p *gcParser) parseExportedName() (*ast.Object, string) {
+	p.expect('@')
 	pkg := p.parsePkgId()
 	p.expect('.')
 	name := p.parseDotIdent()
-
-	// a type may have been declared before - if it exists
-	// already in the respective package scope, return that
-	// type
-	scope := pkg.Data.(*ast.Scope)
-	if kind == ast.Typ {
-		if obj := scope.Lookup(name); obj != nil {
-			assert(obj.Kind == ast.Typ)
-			return obj
-		}
-	}
-
-	// any other object must be a newly declared object -
-	// create it and insert it into the package scope
-	obj := ast.NewObj(kind, name)
-	if scope.Insert(obj) != nil {
-		p.errorf("already declared: %s", obj.Name)
-	}
-
-	// a new type object is a named type and may be referred
-	// to before the underlying type is known - set it up
-	if kind == ast.Typ {
-		obj.Type = &Name{Obj: obj}
-	}
-
-	return obj
+	return pkg, name
 }
 
 // ----------------------------------------------------------------------------
@@ -333,7 +337,7 @@ func (p *gcParser) parseName() (name string) {
 	return
 }
 
-// Field = Name Type [ ":" string_lit ] .
+// Field = Name Type [ string_lit ] .
 //
 func (p *gcParser) parseField() (fld *ast.Object, tag string) {
 	name := p.parseName()
@@ -344,8 +348,7 @@ func (p *gcParser) parseField() (fld *ast.Object, tag string) {
 			p.errorf("anonymous field expected")
 		}
 	}
-	if p.tok == ':' {
-		p.next()
+	if p.tok == scanner.String {
 		tag = p.expect(scanner.String)
 	}
 	fld = ast.NewObj(ast.Var, name)
@@ -380,7 +383,7 @@ func (p *gcParser) parseStructType() Type {
 	return &Struct{Fields: fields, Tags: tags}
 }
 
-// Parameter = ( identifier | "?" ) [ "..." ] Type [ ":" string_lit ] .
+// Parameter = ( identifier | "?" ) [ "..." ] Type [ string_lit ] .
 //
 func (p *gcParser) parseParameter() (par *ast.Object, isVariadic bool) {
 	name := p.parseName()
@@ -393,8 +396,7 @@ func (p *gcParser) parseParameter() (par *ast.Object, isVariadic bool) {
 	}
 	ptyp := p.parseType()
 	// ignore argument tag
-	if p.tok == ':' {
-		p.next()
+	if p.tok == scanner.String {
 		p.expect(scanner.String)
 	}
 	par = ast.NewObj(ast.Var, name)
@@ -439,7 +441,7 @@ func (p *gcParser) parseSignature() *Func {
 	// optional result type
 	var results []*ast.Object
 	switch p.tok {
-	case scanner.Ident, scanner.String, '[', '*', '<':
+	case scanner.Ident, '[', '*', '<', '@':
 		// single, unnamed result
 		result := ast.NewObj(ast.Var, "_")
 		result.Type = p.parseType()
@@ -456,16 +458,13 @@ func (p *gcParser) parseSignature() *Func {
 	return &Func{Params: params, Results: results, IsVariadic: isVariadic}
 }
 
-// MethodSpec = identifier Signature .
+// MethodSpec = ( identifier | ExportedName )  Signature .
 //
 func (p *gcParser) parseMethodSpec() *ast.Object {
 	if p.tok == scanner.Ident {
 		p.expect(scanner.Ident)
 	} else {
-		// TODO(gri) should this be parseExportedName here?
-		p.parsePkgId()
-		p.expect('.')
-		p.parseDotIdent()
+		p.parseExportedName()
 	}
 	p.parseSignature()
 
@@ -547,9 +546,10 @@ func (p *gcParser) parseType() Type {
 		case "chan":
 			return p.parseChanType()
 		}
-	case scanner.String:
+	case '@':
 		// TypeName
-		return p.parseExportedName(ast.Typ).Type.(Type)
+		pkg, name := p.parseExportedName()
+		return p.declare(pkg.Data.(*ast.Scope), ast.Typ, name).Type.(Type)
 	case '[':
 		p.next() // look ahead
 		if p.tok == ']' {
@@ -643,7 +643,8 @@ func (p *gcParser) parseNumber() Const {
 //
 func (p *gcParser) parseConstDecl() {
 	p.expectKeyword("const")
-	obj := p.parseExportedName(ast.Con)
+	pkg, name := p.parseExportedName()
+	obj := p.declare(pkg.Data.(*ast.Scope), ast.Con, name)
 	var x Const
 	var typ Type
 	if p.tok != '=' {
@@ -693,7 +694,8 @@ func (p *gcParser) parseConstDecl() {
 //
 func (p *gcParser) parseTypeDecl() {
 	p.expectKeyword("type")
-	obj := p.parseExportedName(ast.Typ)
+	pkg, name := p.parseExportedName()
+	obj := p.declare(pkg.Data.(*ast.Scope), ast.Typ, name)
 
 	// The type object may have been imported before and thus already
 	// have a type associated with it. We still need to parse the type
@@ -712,20 +714,39 @@ func (p *gcParser) parseTypeDecl() {
 //
 func (p *gcParser) parseVarDecl() {
 	p.expectKeyword("var")
-	obj := p.parseExportedName(ast.Var)
+	pkg, name := p.parseExportedName()
+	obj := p.declare(pkg.Data.(*ast.Scope), ast.Var, name)
 	obj.Type = p.parseType()
 }
 
-// FuncDecl = "func" ExportedName Signature .
+// FuncBody = "{" ... "}" .
+// 
+func (p *gcParser) parseFuncBody() {
+	p.expect('{')
+	for i := 1; i > 0; p.next() {
+		switch p.tok {
+		case '{':
+			i++
+		case '}':
+			i--
+		}
+	}
+}
+
+// FuncDecl = "func" ExportedName Signature [ FuncBody ] .
 //
 func (p *gcParser) parseFuncDecl() {
 	// "func" already consumed
-	obj := p.parseExportedName(ast.Fun)
+	pkg, name := p.parseExportedName()
+	obj := p.declare(pkg.Data.(*ast.Scope), ast.Fun, name)
 	obj.Type = p.parseSignature()
+	if p.tok == '{' {
+		p.parseFuncBody()
+	}
 }
 
 // MethodDecl = "func" Receiver identifier Signature .
-// Receiver   = "(" ( identifier | "?" ) [ "*" ] ExportedName ")" .
+// Receiver   = "(" ( identifier | "?" ) [ "*" ] ExportedName ")" [ FuncBody ].
 //
 func (p *gcParser) parseMethodDecl() {
 	// "func" already consumed
@@ -734,6 +755,9 @@ func (p *gcParser) parseMethodDecl() {
 	p.expect(')')
 	p.expect(scanner.Ident)
 	p.parseSignature()
+	if p.tok == '{' {
+		p.parseFuncBody()
+	}
 }
 
 // Decl = [ ImportDecl | ConstDecl | TypeDecl | VarDecl | FuncDecl | MethodDecl ] "\n" .

test/ddd1.go

@@ -15,8 +15,8 @@ var (
 	_ = sum()
 	_ = sum(1.0, 2.0)
 	_ = sum(1.5)      // ERROR "integer"
-	_ = sum("hello")  // ERROR "string.*as type int|incompatible"
-	_ = sum([]int{1}) // ERROR "slice literal.*as type int|incompatible"
+	_ = sum("hello")  // ERROR ".hello. .type string. as type int|incompatible"
+	_ = sum([]int{1}) // ERROR "\[\]int literal.*as type int|incompatible"
 )
 
 type T []T