gc: more accurate line numbers for ATEXT

and other begin and end of function code

R=ken2
CC=golang-dev
https://golang.org/cl/2158044

src/cmd/5g/ggen.c

@@ -61,6 +61,8 @@ compile(Node *fn)
 
 	pl = newplist();
 	pl->name = curfn->nname;
+	
+	setlineno(curfn);
 
 	nodconst(&nod1, types[TINT32], 0);
 	ptxt = gins(ATEXT, curfn->nname, &nod1);
@@ -93,6 +95,8 @@ compile(Node *fn)
 		genlist(curfn->exit);
 	if(nerrors != 0)
 		goto ret;
+	if(curfn->endlineno)
+		lineno = curfn->endlineno;
 	pc->as = ARET;	// overwrite AEND
 	pc->lineno = lineno;
 

src/cmd/6g/ggen.c

@@ -62,6 +62,8 @@ compile(Node *fn)
 	pl = newplist();
 	pl->name = curfn->nname;
 
+	setlineno(curfn);
+
 	nodconst(&nod1, types[TINT32], 0);
 	ptxt = gins(ATEXT, curfn->nname, &nod1);
 	afunclit(&ptxt->from);
@@ -83,6 +85,8 @@ compile(Node *fn)
 	checklabels();
 	if(nerrors != 0)
 		goto ret;
+	if(curfn->endlineno)
+		lineno = curfn->endlineno;
 
 	if(curfn->type->outtuple != 0)
 		ginscall(throwreturn, 0);

src/cmd/8g/ggen.c

@@ -64,6 +64,8 @@ compile(Node *fn)
 	pl = newplist();
 	pl->name = curfn->nname;
 
+	setlineno(curfn);
+
 	nodconst(&nod1, types[TINT32], 0);
 	ptxt = gins(ATEXT, curfn->nname, &nod1);
 	afunclit(&ptxt->from);
@@ -85,6 +87,8 @@ compile(Node *fn)
 	checklabels();
 	if(nerrors != 0)
 		goto ret;
+	if(curfn->endlineno)
+		lineno = curfn->endlineno;
 
 	if(curfn->type->outtuple != 0)
 		ginscall(throwreturn, 0);

src/cmd/gc/go.y

@@ -1100,6 +1100,7 @@ xfndcl:
 		if($$ == N)
 			break;
 		$$->nbody = $3;
+		$$->endlineno = lineno;
 		funcbody($$);
 	}