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// UNREVIEWED
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements various error reporters.
package types2
import (
"bytes"
"cmd/compile/internal/syntax"
"fmt"
"strconv"
"strings"
)
func unimplemented() {
panic("unimplemented")
}
func assert(p bool) {
if !p {
panic("assertion failed")
}
}
func unreachable() {
panic("unreachable")
}
func (check *Checker) qualifier(pkg *Package) string {
// Qualify the package unless it's the package being type-checked.
if pkg != check.pkg {
// If the same package name was used by multiple packages, display the full path.
if check.pkgCnt[pkg.name] > 1 {
return strconv.Quote(pkg.path)
}
return pkg.name
}
return ""
}
func (check *Checker) sprintf(format string, args ...interface{}) string {
for i, arg := range args {
switch a := arg.(type) {
case nil:
arg = "<nil>"
case operand:
panic("internal error: should always pass *operand")
case *operand:
arg = operandString(a, check.qualifier)
case syntax.Pos:
arg = a.String()
case syntax.Expr:
arg = syntax.ShortString(a)
case Object:
arg = ObjectString(a, check.qualifier)
case Type:
arg = TypeString(a, check.qualifier)
}
args[i] = arg
}
return fmt.Sprintf(format, args...)
}
func (check *Checker) trace(pos syntax.Pos, format string, args ...interface{}) {
fmt.Printf("%s:\t%s%s\n",
pos,
strings.Repeat(". ", check.indent),
check.sprintf(format, args...),
)
}
// dump is only needed for debugging
func (check *Checker) dump(format string, args ...interface{}) {
fmt.Println(check.sprintf(format, args...))
}
func (check *Checker) err(pos syntax.Pos, msg string, soft bool) {
// 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
// exclude them if these strings are not at the beginning,
// and only if we have at least one error already reported.
if check.firstErr != nil && (strings.Index(msg, "invalid operand") > 0 || strings.Index(msg, "invalid type") > 0) {
return
}
// If we are encountering an error while evaluating an inherited
// constant initialization expression, pos is the position of in
// the original expression, and not of the currently declared
// constant identifier. Use the provided errpos instead.
// TODO(gri) We may also want to augment the error message and
// refer to the position (pos) in the original expression.
if check.errpos.IsKnown() {
assert(check.iota != nil)
pos = check.errpos
}
err := Error{pos, stripAnnotations(msg), msg, soft}
if check.firstErr == nil {
check.firstErr = err
}
if check.conf.Trace {
check.trace(pos, "ERROR: %s", msg)
}
f := check.conf.Error
if f == nil {
panic(bailout{}) // report only first error
}
f(err)
}
type poser interface {
Pos() syntax.Pos
}
func (check *Checker) error(at poser, msg string) {
check.err(posFor(at), msg, false)
}
func (check *Checker) errorf(at poser, format string, args ...interface{}) {
check.err(posFor(at), check.sprintf(format, args...), false)
}
func (check *Checker) softErrorf(at poser, format string, args ...interface{}) {
check.err(posFor(at), check.sprintf(format, args...), true)
}
func (check *Checker) invalidASTf(at poser, format string, args ...interface{}) {
check.errorf(at, "invalid AST: "+format, args...)
}
func (check *Checker) invalidArgf(at poser, format string, args ...interface{}) {
check.errorf(at, "invalid argument: "+format, args...)
}
func (check *Checker) invalidOpf(at poser, format string, args ...interface{}) {
check.errorf(at, "invalid operation: "+format, args...)
}
// posFor reports the left (= start) position of at.
func posFor(at poser) syntax.Pos {
switch x := at.(type) {
case *operand:
if x.expr != nil {
return startPos(x.expr)
}
case syntax.Node:
return startPos(x)
}
return at.Pos()
}
// stripAnnotations removes internal (type) annotations from s.
func stripAnnotations(s string) string {
// Would like to use strings.Builder but it's not available in Go 1.4.
var b bytes.Buffer
for _, r := range s {
// strip #'s and subscript digits
if r != instanceMarker && !('₀' <= r && r < '₀'+10) { // '₀' == U+2080
b.WriteRune(r)
}
}
if b.Len() < len(s) {
return b.String()
}
return s
}
|
