cmd/compile/internal/syntax: track column position at function end

Fixes #19576.

Change-Id: I11034fb08e989f6eb7d54bde873b92804223598d
Reviewed-on: https://go-review.googlesource.com/38291
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/gc/noder.go

@@ -325,7 +325,7 @@ func (p *noder) funcDecl(fun *syntax.FuncDecl) *Node {
 		yyerror("go:nosplit and go:systemstack cannot be combined")
 	}
 	f.Func.Pragma = pragma
-	lineno = makePos(fun.Pos().Base(), fun.EndLine, 0)
+	lineno = Ctxt.PosTable.XPos(fun.Rbrace)
 	f.Func.Endlineno = lineno
 
 	funcbody(f)
@@ -451,14 +451,14 @@ func (p *noder) expr(expr syntax.Expr) *Node {
 			l[i] = p.wrapname(expr.ElemList[i], e)
 		}
 		n.List.Set(l)
-		lineno = makePos(expr.Pos().Base(), expr.EndLine, 0)
+		lineno = Ctxt.PosTable.XPos(expr.Rbrace)
 		return n
 	case *syntax.KeyValueExpr:
 		return p.nod(expr, OKEY, p.expr(expr.Key), p.wrapname(expr.Value, p.expr(expr.Value)))
 	case *syntax.FuncLit:
 		closurehdr(p.typeExpr(expr.Type))
 		body := p.stmts(expr.Body)
-		lineno = makePos(expr.Pos().Base(), expr.EndLine, 0)
+		lineno = Ctxt.PosTable.XPos(expr.Rbrace)
 		return p.setlineno(expr, closurebody(body))
 	case *syntax.ParenExpr:
 		return p.nod(expr, OPAREN, p.expr(expr.X), nil)

src/cmd/compile/internal/syntax/nodes.go

@@ -100,13 +100,13 @@ type (
 	// func Receiver Name Type { Body }
 	// func Receiver Name Type
 	FuncDecl struct {
-		Attr    map[string]bool // go:attr map
-		Recv    *Field          // nil means regular function
-		Name    *Name
-		Type    *FuncType
-		Body    []Stmt // nil means no body (forward declaration)
-		Pragma  Pragma // TODO(mdempsky): Cleaner solution.
-		EndLine uint   // TODO(mdempsky): Cleaner solution.
+		Attr   map[string]bool // go:attr map
+		Recv   *Field          // nil means regular function
+		Name   *Name
+		Type   *FuncType
+		Body   []Stmt  // nil means no body (forward declaration)
+		Pragma Pragma  // TODO(mdempsky): Cleaner solution.
+		Rbrace src.Pos // TODO(mdempsky): Cleaner solution.
 		decl
 	}
 )
@@ -146,8 +146,8 @@ type (
 	CompositeLit struct {
 		Type     Expr // nil means no literal type
 		ElemList []Expr
-		NKeys    int  // number of elements with keys
-		EndLine  uint // TODO(mdempsky): Cleaner solution.
+		NKeys    int     // number of elements with keys
+		Rbrace   src.Pos // TODO(mdempsky): Cleaner solution.
 		expr
 	}
 
@@ -159,9 +159,9 @@ type (
 
 	// func Type { Body }
 	FuncLit struct {
-		Type    *FuncType
-		Body    []Stmt
-		EndLine uint // TODO(mdempsky): Cleaner solution.
+		Type   *FuncType
+		Body   []Stmt
+		Rbrace src.Pos // TODO(mdempsky): Cleaner solution.
 		expr
 	}
 

src/cmd/compile/internal/syntax/parser.go

@@ -480,10 +480,13 @@ func (p *parser) funcDecl() *FuncDecl {
 
 	f.Name = p.name()
 	f.Type = p.funcType()
-	f.Body = p.funcBody()
+	if p.got(_Lbrace) {
+		f.Body = p.funcBody()
+		f.Rbrace = p.pos()
+		p.want(_Rbrace)
+	}
 
 	f.Pragma = p.pragma
-	f.EndLine = p.line
 
 	// TODO(gri) deal with function properties
 	// if noescape && body != nil {
@@ -700,18 +703,17 @@ func (p *parser) operand(keep_parens bool) Expr {
 		pos := p.pos()
 		p.next()
 		t := p.funcType()
-		if p.tok == _Lbrace {
-			p.fnest++
+		if p.got(_Lbrace) {
 			p.xnest++
 
 			f := new(FuncLit)
 			f.pos = pos
 			f.Type = t
 			f.Body = p.funcBody()
-			f.EndLine = p.line
+			f.Rbrace = p.pos()
+			p.want(_Rbrace)
 
 			p.xnest--
-			p.fnest--
 			return f
 		}
 		return t
@@ -920,7 +922,7 @@ func (p *parser) complitexpr() *CompositeLit {
 		}
 	}
 
-	x.EndLine = p.line
+	x.Rbrace = p.pos()
 	p.xnest--
 	p.want(_Rbrace)
 
@@ -1148,18 +1150,14 @@ func (p *parser) funcBody() []Stmt {
 		defer p.trace("funcBody")()
 	}
 
-	if p.got(_Lbrace) {
-		p.fnest++
-		body := p.stmtList()
-		p.fnest--
-		p.want(_Rbrace)
-		if body == nil {
-			body = []Stmt{new(EmptyStmt)}
-		}
-		return body
-	}
+	p.fnest++
+	body := p.stmtList()
+	p.fnest--
 
-	return nil
+	if body == nil {
+		body = []Stmt{new(EmptyStmt)}
+	}
+	return body
 }
 
 // Result = Parameters | Type .