// Copyright 2010 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.package runtime// The Error interface identifies a run time error.type Error interface { error // RuntimeError is a no-op function but // serves to distinguish types that are run time // errors from ordinary errors: a type is a // run time error if it has a RuntimeError method. RuntimeError()}// A TypeAssertionError explains a failed type assertion.type TypeAssertionError struct { interfaceString string concreteString string assertedString string missingMethod string // one method needed by Interface, missing from Concrete}func (*TypeAssertionError) RuntimeError() {}func (e *TypeAssertionError) Error() string { inter := e.interfaceString if inter == "" { inter = "interface" } if e.concreteString == "" { return "interface conversion: " + inter + " is nil, not " + e.assertedString } if e.missingMethod == "" { return "interface conversion: " + inter + " is " + e.concreteString + ", not " + e.assertedString } return "interface conversion: " + e.concreteString + " is not " + e.assertedString + ": missing method " + e.missingMethod}// An errorString represents a runtime error described by a single string.type errorString stringfunc (e errorString) RuntimeError() {}func (e errorString) Error() string { return "runtime error: " + string(e)}type stringer interface { String() string}func typestring(x interface{}) string { e := efaceOf(&x) return *e._type._string}// For calling from C.// Prints an argument passed to panic.// There's room for arbitrary complexity here, but we keep it// simple and handle just a few important cases: int, string, and Stringer.func printany(i interface{}) { switch v := i.(type) { case nil: print("nil") case stringer: print(v.String()) case error: print(v.Error()) case int: print(v) case string: print(v) default: print("(", typestring(i), ") ", i) }}// called from generated codefunc panicwrap(pkg, typ, meth string) { panic("value method " + pkg + "." + typ + "." + meth + " called using nil *" + typ + " pointer")}
// Copyright 2010 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.
package runtime
// The Error interface identifies a run time error.
type Error interface {
error
// RuntimeError is a no-op function but
// serves to distinguish types that are run time
// errors from ordinary errors: a type is a
// run time error if it has a RuntimeError method.
RuntimeError()
}
// A TypeAssertionError explains a failed type assertion.
type TypeAssertionError struct {
interfaceString string
concreteString string
assertedString string
missingMethod string // one method needed by Interface, missing from Concrete
}
func (*TypeAssertionError) RuntimeError() {}
func (e *TypeAssertionError) Error() string {
inter := e.interfaceString
if inter == "" {
inter = "interface"
}
if e.concreteString == "" {
return "interface conversion: " + inter + " is nil, not " + e.assertedString
}
if e.missingMethod == "" {
return "interface conversion: " + inter + " is " + e.concreteString +
", not " + e.assertedString
}
return "interface conversion: " + e.concreteString + " is not " + e.assertedString +
": missing method " + e.missingMethod
}
// An errorString represents a runtime error described by a single string.
type errorString string
func (e errorString) RuntimeError() {}
func (e errorString) Error() string {
return "runtime error: " + string(e)
}
type stringer interface {
String() string
}
func typestring(x interface{}) string {
e := efaceOf(&x)
return *e._type._string
}
// For calling from C.
// Prints an argument passed to panic.
// There's room for arbitrary complexity here, but we keep it
// simple and handle just a few important cases: int, string, and Stringer.
func printany(i interface{}) {
switch v := i.(type) {
case nil:
print("nil")
case stringer:
print(v.String())
case error:
print(v.Error())
case int:
print(v)
case string:
print(v)
default:
print("(", typestring(i), ") ", i)
}
}
// called from generated code
func panicwrap(pkg, typ, meth string) {
panic("value method " + pkg + "." + typ + "." + meth + " called using nil *" + typ + " pointer")
}