-// 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.
"bytes"
"cmd/compile/internal/syntax"
"fmt"
+ . "internal/types/errors"
+ "runtime"
"strconv"
"strings"
)
-func unimplemented() {
- panic("unimplemented")
-}
-
func assert(p bool) {
if !p {
- panic("assertion failed")
+ msg := "assertion failed"
+ // Include information about the assertion location. Due to panic recovery,
+ // this location is otherwise buried in the middle of the panicking stack.
+ if _, file, line, ok := runtime.Caller(1); ok {
+ msg = fmt.Sprintf("%s:%d: %s", file, line, msg)
+ }
+ panic(msg)
}
}
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)
+// An error_ represents a type-checking error.
+// To report an error_, call Checker.report.
+type error_ struct {
+ desc []errorDesc
+ code Code
+ soft bool // TODO(gri) eventually determine this from an error code
+}
+
+// An errorDesc describes part of a type-checking error.
+type errorDesc struct {
+ pos syntax.Pos
+ format string
+ args []interface{}
+}
+
+func (err *error_) empty() bool {
+ return err.desc == nil
+}
+
+func (err *error_) pos() syntax.Pos {
+ if err.empty() {
+ return nopos
+ }
+ return err.desc[0].pos
+}
+
+func (err *error_) msg(qf Qualifier) string {
+ if err.empty() {
+ return "no error"
+ }
+ var buf strings.Builder
+ for i := range err.desc {
+ p := &err.desc[i]
+ if i > 0 {
+ fmt.Fprint(&buf, "\n\t")
+ if p.pos.IsKnown() {
+ fmt.Fprintf(&buf, "%s: ", p.pos)
+ }
}
- return pkg.name
+ buf.WriteString(sprintf(qf, false, p.format, p.args...))
}
- return ""
+ return buf.String()
}
-func (check *Checker) sprintf(format string, args ...interface{}) string {
+// String is for testing.
+func (err *error_) String() string {
+ if err.empty() {
+ return "no error"
+ }
+ return fmt.Sprintf("%s: %s", err.pos(), err.msg(nil))
+}
+
+// errorf adds formatted error information to err.
+// It may be called multiple times to provide additional information.
+func (err *error_) errorf(at poser, format string, args ...interface{}) {
+ err.desc = append(err.desc, errorDesc{atPos(at), format, args})
+}
+
+func sprintf(qf Qualifier, tpSubscripts bool, 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")
+ panic("got operand instead of *operand")
case *operand:
- arg = operandString(a, check.qualifier)
+ arg = operandString(a, qf)
case syntax.Pos:
arg = a.String()
case syntax.Expr:
- arg = ExprString(a)
+ arg = syntax.String(a)
+ case []syntax.Expr:
+ var buf strings.Builder
+ buf.WriteByte('[')
+ for i, x := range a {
+ if i > 0 {
+ buf.WriteString(", ")
+ }
+ buf.WriteString(syntax.String(x))
+ }
+ buf.WriteByte(']')
+ arg = buf.String()
case Object:
- arg = ObjectString(a, check.qualifier)
+ arg = ObjectString(a, qf)
case Type:
- arg = TypeString(a, check.qualifier)
+ var buf bytes.Buffer
+ w := newTypeWriter(&buf, qf)
+ w.tpSubscripts = tpSubscripts
+ w.typ(a)
+ arg = buf.String()
+ case []Type:
+ var buf bytes.Buffer
+ w := newTypeWriter(&buf, qf)
+ w.tpSubscripts = tpSubscripts
+ buf.WriteByte('[')
+ for i, x := range a {
+ if i > 0 {
+ buf.WriteString(", ")
+ }
+ w.typ(x)
+ }
+ buf.WriteByte(']')
+ arg = buf.String()
+ case []*TypeParam:
+ var buf bytes.Buffer
+ w := newTypeWriter(&buf, qf)
+ w.tpSubscripts = tpSubscripts
+ buf.WriteByte('[')
+ for i, x := range a {
+ if i > 0 {
+ buf.WriteString(", ")
+ }
+ w.typ(x)
+ }
+ buf.WriteByte(']')
+ arg = buf.String()
}
args[i] = arg
}
return fmt.Sprintf(format, args...)
}
+func (check *Checker) qualifier(pkg *Package) string {
+ // Qualify the package unless it's the package being type-checked.
+ if pkg != check.pkg {
+ if check.pkgPathMap == nil {
+ check.pkgPathMap = make(map[string]map[string]bool)
+ check.seenPkgMap = make(map[*Package]bool)
+ check.markImports(check.pkg)
+ }
+ // If the same package name was used by multiple packages, display the full path.
+ if len(check.pkgPathMap[pkg.name]) > 1 {
+ return strconv.Quote(pkg.path)
+ }
+ return pkg.name
+ }
+ return ""
+}
+
+// markImports recursively walks pkg and its imports, to record unique import
+// paths in pkgPathMap.
+func (check *Checker) markImports(pkg *Package) {
+ if check.seenPkgMap[pkg] {
+ return
+ }
+ check.seenPkgMap[pkg] = true
+
+ forName, ok := check.pkgPathMap[pkg.name]
+ if !ok {
+ forName = make(map[string]bool)
+ check.pkgPathMap[pkg.name] = forName
+ }
+ forName[pkg.path] = true
+
+ for _, imp := range pkg.imports {
+ check.markImports(imp)
+ }
+}
+
+// check may be nil.
+func (check *Checker) sprintf(format string, args ...interface{}) string {
+ var qf Qualifier
+ if check != nil {
+ qf = check.qualifier
+ }
+ return sprintf(qf, false, format, args...)
+}
+
+func (check *Checker) report(err *error_) {
+ if err.empty() {
+ panic("no error to report")
+ }
+ check.err(err.pos(), err.code, err.msg(check.qualifier), err.soft)
+}
+
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...),
+ sprintf(check.qualifier, true, format, args...),
)
}
// dump is only needed for debugging
func (check *Checker) dump(format string, args ...interface{}) {
- fmt.Println(check.sprintf(format, args...))
+ fmt.Println(sprintf(check.qualifier, true, format, args...))
}
-func (check *Checker) err(pos syntax.Pos, msg string, soft bool) {
+func (check *Checker) err(at poser, code Code, msg string, soft bool) {
+ switch code {
+ case InvalidSyntaxTree:
+ msg = "invalid syntax tree: " + msg
+ case 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
return
}
+ pos := atPos(at)
+
// 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
pos = check.errpos
}
- err := Error{pos, stripAnnotations(msg), msg, soft}
+ // If we have a URL for error codes, add a link to the first line.
+ if code != 0 && check.conf.ErrorURL != "" {
+ u := fmt.Sprintf(check.conf.ErrorURL, code)
+ if i := strings.Index(msg, "\n"); i >= 0 {
+ msg = msg[:i] + u + msg[i:]
+ } else {
+ msg += u
+ }
+ }
+
+ err := Error{pos, stripAnnotations(msg), msg, soft, code}
if check.firstErr == nil {
check.firstErr = err
}
f(err)
}
+const (
+ invalidArg = "invalid argument: "
+ invalidOp = "invalid operation: "
+)
+
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) error(at poser, code Code, msg string) {
+ check.err(at, code, msg, false)
}
-func (check *Checker) invalidASTf(at poser, format string, args ...interface{}) {
- check.errorf(at, "invalid AST: "+format, args...)
+func (check *Checker) errorf(at poser, code Code, format string, args ...interface{}) {
+ check.err(at, code, check.sprintf(format, args...), false)
}
-func (check *Checker) invalidArgf(at poser, format string, args ...interface{}) {
- check.errorf(at, "invalid argument: "+format, args...)
+func (check *Checker) softErrorf(at poser, code Code, format string, args ...interface{}) {
+ check.err(at, code, check.sprintf(format, args...), true)
}
-func (check *Checker) invalidOpf(at poser, format string, args ...interface{}) {
- check.errorf(at, "invalid operation: "+format, args...)
+func (check *Checker) versionErrorf(at poser, v goVersion, format string, args ...interface{}) {
+ msg := check.sprintf(format, args...)
+ msg = fmt.Sprintf("%s requires %s or later", msg, v)
+ check.err(at, UnsupportedFeature, msg, true)
}
-// posFor reports the left (= start) position of at.
-func posFor(at poser) syntax.Pos {
+// atPos reports the left (= start) position of at.
+func atPos(at poser) syntax.Pos {
switch x := at.(type) {
case *operand:
if x.expr != nil {
- return startPos(x.expr)
+ return syntax.StartPos(x.expr)
}
case syntax.Node:
- return startPos(x)
+ return syntax.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
+ var buf strings.Builder
for _, r := range s {
// strip #'s and subscript digits
- if r != instanceMarker && !('₀' <= r && r < '₀'+10) { // '₀' == U+2080
- b.WriteRune(r)
+ if r < '₀' || '₀'+10 <= r { // '₀' == U+2080
+ buf.WriteRune(r)
}
}
- if b.Len() < len(s) {
- return b.String()
+ if buf.Len() < len(s) {
+ return buf.String()
}
return s
}