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go/types, types2: use zero error code to indicate unset error code

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Use InvalidSyntaxError where the zero error code was used before.
Fix a couple of places that didn't set an error code.
Panic in error reporting if no error code is provided.

Change-Id: I3a537d42b720deb5c351bf38871e04919325e231
Reviewed-on: https://go-review.googlesource.com/c/go/+/439566
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
This commit is contained in:
Robert Griesemer 2022-10-06 18:09:23 -07:00 committed by Gopher Robot
parent 578523e4a0
commit 388fbf287c
16 changed files with 42 additions and 32 deletions
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3
src/cmd/compile/internal/types2/assignments.go
View File

@ -28,7 +28,8 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
// ok
default:
// we may get here because of other problems (issue #39634, crash 12)
check.errorf(x, 0, "cannot assign %s to %s in %s", x, T, context)
// TODO(gri) do we need a new "generic" error code here?
check.errorf(x, IncompatibleAssign, "cannot assign %s to %s in %s", x, T, context)
return
}

2
src/cmd/compile/internal/types2/call.go
View File

@ -287,7 +287,7 @@ func (check *Checker) arguments(call *syntax.CallExpr, sig *Signature, targs []T
for _, a := range args {
switch a.mode {
case typexpr:
check.errorf(a, 0, "%s used as value", a)
check.errorf(a, NotAnExpr, "%s used as value", a)
return
case invalid:
return

2
src/cmd/compile/internal/types2/decl.go
View File

@ -899,7 +899,7 @@ func (check *Checker) declStmt(list []syntax.Decl) {
check.pop().setColor(black)
default:
check.errorf(s, 0, invalidAST+"unknown syntax.Decl node %T", s)
check.errorf(s, InvalidSyntaxTree, invalidAST+"unknown syntax.Decl node %T", s)
}
}
}

4
src/cmd/compile/internal/types2/errors.go
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@ -221,6 +221,10 @@ func (check *Checker) dump(format string, args ...interface{}) {
}
func (check *Checker) err(at poser, code Code, msg string, soft bool) {
if code == 0 {
panic("no error code provided")
}
// Cheap trick: Don't report errors with messages containing
// "invalid operand" or "invalid type" as those tend to be
// follow-on errors which don't add useful information. Only

12
src/cmd/compile/internal/types2/expr.go
View File

@ -78,7 +78,7 @@ func (check *Checker) op(m opPredicates, x *operand, op syntax.Operator) bool {
return false
}
} else {
check.errorf(x, 0, invalidAST+"unknown operator %s", op)
check.errorf(x, InvalidSyntaxTree, invalidAST+"unknown operator %s", op)
return false
}
return true
@ -1337,7 +1337,7 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
x.mode = value
x.typ = sig
} else {
check.errorf(e, 0, invalidAST+"invalid function literal %v", e)
check.errorf(e, InvalidSyntaxTree, invalidAST+"invalid function literal %v", e)
goto Error
}
@ -1594,7 +1594,7 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
}
// x.(type) expressions are encoded via TypeSwitchGuards
if e.Type == nil {
check.error(e, 0, invalidAST+"invalid use of AssertExpr")
check.error(e, InvalidSyntaxTree, invalidAST+"invalid use of AssertExpr")
goto Error
}
T := check.varType(e.Type)
@ -1607,7 +1607,7 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
case *syntax.TypeSwitchGuard:
// x.(type) expressions are handled explicitly in type switches
check.error(e, 0, invalidAST+"use of .(type) outside type switch")
check.error(e, InvalidSyntaxTree, invalidAST+"use of .(type) outside type switch")
goto Error
case *syntax.CallExpr:
@ -1615,7 +1615,7 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
case *syntax.ListExpr:
// catch-all for unexpected expression lists
check.error(e, 0, invalidAST+"unexpected list of expressions")
check.error(e, InvalidSyntaxTree, invalidAST+"unexpected list of expressions")
goto Error
// case *syntax.UnaryExpr:
@ -1692,7 +1692,7 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
case *syntax.KeyValueExpr:
// key:value expressions are handled in composite literals
check.error(e, 0, invalidAST+"no key:value expected")
check.error(e, InvalidSyntaxTree, invalidAST+"no key:value expected")
goto Error
case *syntax.ArrayType, *syntax.SliceType, *syntax.StructType, *syntax.FuncType,

6
src/cmd/compile/internal/types2/index.go
View File

@ -274,7 +274,7 @@ func (check *Checker) sliceExpr(x *operand, e *syntax.SliceExpr) {
// spec: "Only the first index may be omitted; it defaults to 0."
if e.Full && (e.Index[1] == nil || e.Index[2] == nil) {
check.error(e, 0, invalidAST+"2nd and 3rd index required in 3-index slice")
check.error(e, InvalidSyntaxTree, invalidAST+"2nd and 3rd index required in 3-index slice")
x.mode = invalid
return
}
@ -329,12 +329,12 @@ L:
func (check *Checker) singleIndex(e *syntax.IndexExpr) syntax.Expr {
index := e.Index
if index == nil {
check.errorf(e, 0, invalidAST+"missing index for %s", e.X)
check.errorf(e, InvalidSyntaxTree, invalidAST+"missing index for %s", e.X)
return nil
}
if l, _ := index.(*syntax.ListExpr); l != nil {
if n := len(l.ElemList); n <= 1 {
check.errorf(e, 0, invalidAST+"invalid use of ListExpr for index expression %v with %d indices", e, n)
check.errorf(e, InvalidSyntaxTree, invalidAST+"invalid use of ListExpr for index expression %v with %d indices", e, n)
return nil
}
// len(l.ElemList) > 1

2
src/cmd/compile/internal/types2/interface.go
View File

@ -143,7 +143,7 @@ func (check *Checker) interfaceType(ityp *Interface, iface *syntax.InterfaceType
sig, _ := typ.(*Signature)
if sig == nil {
if typ != Typ[Invalid] {
check.errorf(f.Type, 0, invalidAST+"%s is not a method signature", typ)
check.errorf(f.Type, InvalidSyntaxTree, invalidAST+"%s is not a method signature", typ)
}
continue // ignore
}

2
src/cmd/compile/internal/types2/labels.go
View File

@ -219,7 +219,7 @@ func (check *Checker) blockBranches(all *Scope, parent *block, lstmt *syntax.Lab
}
default:
check.errorf(s, 0, invalidAST+"branch statement: %s %s", s.Tok, name)
check.errorf(s, InvalidSyntaxTree, invalidAST+"branch statement: %s %s", s.Tok, name)
return
}

4
src/cmd/compile/internal/types2/resolver.go
View File

@ -467,7 +467,7 @@ func (check *Checker) collectObjects() {
obj.setOrder(uint32(len(check.objMap)))
default:
check.errorf(s, 0, invalidAST+"unknown syntax.Decl node %T", s)
check.errorf(s, InvalidSyntaxTree, invalidAST+"unknown syntax.Decl node %T", s)
}
}
}
@ -550,7 +550,7 @@ L: // unpack receiver type
case *syntax.BadExpr:
// ignore - error already reported by parser
case nil:
check.error(ptyp, 0, invalidAST+"parameterized receiver contains nil parameters")
check.error(ptyp, InvalidSyntaxTree, invalidAST+"parameterized receiver contains nil parameters")
default:
check.errorf(arg, BadDecl, "receiver type parameter %s must be an identifier", arg)
}

4
src/cmd/compile/internal/types2/signature.go
View File

@ -289,7 +289,7 @@ func (check *Checker) collectParams(scope *Scope, list []*syntax.Field, variadic
// named parameter
name := field.Name.Value
if name == "" {
check.error(field.Name, 0, invalidAST+"anonymous parameter")
check.error(field.Name, InvalidSyntaxTree, invalidAST+"anonymous parameter")
// ok to continue
}
par := NewParam(field.Name.Pos(), check.pkg, name, typ)
@ -306,7 +306,7 @@ func (check *Checker) collectParams(scope *Scope, list []*syntax.Field, variadic
}
if named && anonymous {
check.error(list[0], 0, invalidAST+"list contains both named and anonymous parameters")
check.error(list[0], InvalidSyntaxTree, invalidAST+"list contains both named and anonymous parameters")
// ok to continue
}

16
src/cmd/compile/internal/types2/stmt.go
View File

@ -450,7 +450,7 @@ func (check *Checker) stmt(ctxt stmtContext, s syntax.Stmt) {
if s.Rhs == nil {
// x++ or x--
if len(lhs) != 1 {
check.errorf(s, 0, invalidAST+"%s%s requires one operand", s.Op, s.Op)
check.errorf(s, InvalidSyntaxTree, invalidAST+"%s%s requires one operand", s.Op, s.Op)
return
}
var x operand
@ -554,7 +554,7 @@ func (check *Checker) stmt(ctxt stmtContext, s syntax.Stmt) {
// goto's must have labels, should have been caught above
fallthrough
default:
check.errorf(s, 0, invalidAST+"branch statement: %s", s.Tok)
check.errorf(s, InvalidSyntaxTree, invalidAST+"branch statement: %s", s.Tok)
}
case *syntax.BlockStmt:
@ -582,7 +582,7 @@ func (check *Checker) stmt(ctxt stmtContext, s syntax.Stmt) {
case *syntax.IfStmt, *syntax.BlockStmt:
check.stmt(inner, s.Else)
default:
check.error(s.Else, 0, invalidAST+"invalid else branch in if statement")
check.error(s.Else, InvalidSyntaxTree, invalidAST+"invalid else branch in if statement")
}
case *syntax.SwitchStmt:
@ -674,7 +674,7 @@ func (check *Checker) stmt(ctxt stmtContext, s syntax.Stmt) {
check.stmt(inner, s.Body)
default:
check.error(s, 0, invalidAST+"invalid statement")
check.error(s, InvalidSyntaxTree, invalidAST+"invalid statement")
}
}
@ -710,7 +710,7 @@ func (check *Checker) switchStmt(inner stmtContext, s *syntax.SwitchStmt) {
seen := make(valueMap) // map of seen case values to positions and types
for i, clause := range s.Body {
if clause == nil {
check.error(clause, 0, invalidAST+"incorrect expression switch case")
check.error(clause, InvalidSyntaxTree, invalidAST+"incorrect expression switch case")
continue
}
end := s.Rbrace
@ -773,7 +773,7 @@ func (check *Checker) typeSwitchStmt(inner stmtContext, s *syntax.SwitchStmt, gu
seen := make(map[Type]syntax.Expr) // map of seen types to positions
for i, clause := range s.Body {
if clause == nil {
check.error(s, 0, invalidAST+"incorrect type switch case")
check.error(s, InvalidSyntaxTree, invalidAST+"incorrect type switch case")
continue
}
end := s.Rbrace
@ -836,7 +836,7 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
var sValue, sExtra syntax.Expr
if p, _ := sKey.(*syntax.ListExpr); p != nil {
if len(p.ElemList) < 2 {
check.error(s, 0, invalidAST+"invalid lhs in range clause")
check.error(s, InvalidSyntaxTree, invalidAST+"invalid lhs in range clause")
return
}
// len(p.ElemList) >= 2
@ -918,7 +918,7 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
vars = append(vars, obj)
}
} else {
check.errorf(lhs, 0, invalidAST+"cannot declare %s", lhs)
check.errorf(lhs, InvalidSyntaxTree, invalidAST+"cannot declare %s", lhs)
obj = NewVar(lhs.Pos(), check.pkg, "_", nil) // dummy variable
}

4
src/cmd/compile/internal/types2/struct.go
View File

@ -130,7 +130,7 @@ func (check *Checker) structType(styp *Struct, e *syntax.StructType) {
pos := syntax.StartPos(f.Type)
name := embeddedFieldIdent(f.Type)
if name == nil {
check.errorf(pos, 0, invalidAST+"invalid embedded field type %s", f.Type)
check.errorf(pos, InvalidSyntaxTree, invalidAST+"invalid embedded field type %s", f.Type)
name = &syntax.Name{Value: "_"} // TODO(gri) need to set position to pos
addInvalid(name, pos)
continue
@ -217,7 +217,7 @@ func (check *Checker) tag(t *syntax.BasicLit) string {
return val
}
}
check.errorf(t, 0, invalidAST+"incorrect tag syntax: %q", t.Value)
check.errorf(t, InvalidSyntaxTree, invalidAST+"incorrect tag syntax: %q", t.Value)
}
return ""
}

2
src/cmd/compile/internal/types2/typexpr.go
View File

@ -385,7 +385,7 @@ func (check *Checker) typInternal(e0 syntax.Expr, def *Named) (T Type) {
case syntax.RecvOnly:
dir = RecvOnly
default:
check.errorf(e, 0, invalidAST+"unknown channel direction %d", e.Dir)
check.errorf(e, InvalidSyntaxTree, invalidAST+"unknown channel direction %d", e.Dir)
// ok to continue
}

3
src/go/types/assignments.go
View File

@ -29,7 +29,8 @@ func (check *Checker) assignment(x *operand, T Type, context string) {
// ok
default:
// we may get here because of other problems (issue #39634, crash 12)
check.errorf(x, 0, "cannot assign %s to %s in %s", x, T, context)
// TODO(gri) do we need a new "generic" error code here?
check.errorf(x, IncompatibleAssign, "cannot assign %s to %s in %s", x, T, context)
return
}

2
src/go/types/call.go
View File

@ -293,7 +293,7 @@ func (check *Checker) arguments(call *ast.CallExpr, sig *Signature, targs []Type
for _, a := range args {
switch a.mode {
case typexpr:
check.errorf(a, 0, "%s used as value", a)
check.errorf(a, NotAnExpr, "%s used as value", a)
return
case invalid:
return

6
src/go/types/errors.go
View File

@ -220,6 +220,10 @@ func (check *Checker) report(errp *error_) {
panic("empty error details")
}
if errp.code == 0 {
panic("no error code provided")
}
span := spanOf(errp.desc[0].posn)
e := Error{
Fset: check.fset,
@ -301,7 +305,7 @@ func (check *Checker) versionErrorf(at positioner, goVersion string, format stri
}
func (check *Checker) invalidAST(at positioner, format string, args ...any) {
check.errorf(at, 0, "invalid AST: "+format, args...)
check.errorf(at, InvalidSyntaxTree, "invalid AST: "+format, args...)
}
func (check *Checker) invalidArg(at positioner, code Code, format string, args ...any) {