runtime: map
This commit is contained in:
xushiwei
334
internal/runtime/error.go
Normal file
334
internal/runtime/error.go
Normal file
@@ -0,0 +1,334 @@
|
||||
// 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
|
||||
|
||||
/*
|
||||
import "internal/bytealg"
|
||||
|
||||
// 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 {
|
||||
_interface *_type
|
||||
concrete *_type
|
||||
asserted *_type
|
||||
missingMethod string // one method needed by Interface, missing from Concrete
|
||||
}
|
||||
|
||||
func (*TypeAssertionError) RuntimeError() {}
|
||||
|
||||
func (e *TypeAssertionError) Error() string {
|
||||
inter := "interface"
|
||||
if e._interface != nil {
|
||||
inter = toRType(e._interface).string()
|
||||
}
|
||||
as := toRType(e.asserted).string()
|
||||
if e.concrete == nil {
|
||||
return "interface conversion: " + inter + " is nil, not " + as
|
||||
}
|
||||
cs := toRType(e.concrete).string()
|
||||
if e.missingMethod == "" {
|
||||
msg := "interface conversion: " + inter + " is " + cs + ", not " + as
|
||||
if cs == as {
|
||||
// provide slightly clearer error message
|
||||
if toRType(e.concrete).pkgpath() != toRType(e.asserted).pkgpath() {
|
||||
msg += " (types from different packages)"
|
||||
} else {
|
||||
msg += " (types from different scopes)"
|
||||
}
|
||||
}
|
||||
return msg
|
||||
}
|
||||
return "interface conversion: " + cs + " is not " + as +
|
||||
": missing method " + e.missingMethod
|
||||
}
|
||||
|
||||
// itoa converts val to a decimal representation. The result is
|
||||
// written somewhere within buf and the location of the result is returned.
|
||||
// buf must be at least 20 bytes.
|
||||
//
|
||||
//go:nosplit
|
||||
func itoa(buf []byte, val uint64) []byte {
|
||||
i := len(buf) - 1
|
||||
for val >= 10 {
|
||||
buf[i] = byte(val%10 + '0')
|
||||
i--
|
||||
val /= 10
|
||||
}
|
||||
buf[i] = byte(val + '0')
|
||||
return buf[i:]
|
||||
}
|
||||
|
||||
// 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 errorAddressString struct {
|
||||
msg string // error message
|
||||
addr uintptr // memory address where the error occurred
|
||||
}
|
||||
|
||||
func (e errorAddressString) RuntimeError() {}
|
||||
|
||||
func (e errorAddressString) Error() string {
|
||||
return "runtime error: " + e.msg
|
||||
}
|
||||
|
||||
// Addr returns the memory address where a fault occurred.
|
||||
// The address provided is best-effort.
|
||||
// The veracity of the result may depend on the platform.
|
||||
// Errors providing this method will only be returned as
|
||||
// a result of using runtime/debug.SetPanicOnFault.
|
||||
func (e errorAddressString) Addr() uintptr {
|
||||
return e.addr
|
||||
}
|
||||
*/
|
||||
|
||||
// plainError represents a runtime error described a string without
|
||||
// the prefix "runtime error: " after invoking errorString.Error().
|
||||
// See Issue #14965.
|
||||
type plainError string
|
||||
|
||||
func (e plainError) RuntimeError() {}
|
||||
|
||||
func (e plainError) Error() string {
|
||||
return string(e)
|
||||
}
|
||||
|
||||
/*
|
||||
// A boundsError represents an indexing or slicing operation gone wrong.
|
||||
type boundsError struct {
|
||||
x int64
|
||||
y int
|
||||
// Values in an index or slice expression can be signed or unsigned.
|
||||
// That means we'd need 65 bits to encode all possible indexes, from -2^63 to 2^64-1.
|
||||
// Instead, we keep track of whether x should be interpreted as signed or unsigned.
|
||||
// y is known to be nonnegative and to fit in an int.
|
||||
signed bool
|
||||
code boundsErrorCode
|
||||
}
|
||||
|
||||
type boundsErrorCode uint8
|
||||
|
||||
const (
|
||||
boundsIndex boundsErrorCode = iota // s[x], 0 <= x < len(s) failed
|
||||
|
||||
boundsSliceAlen // s[?:x], 0 <= x <= len(s) failed
|
||||
boundsSliceAcap // s[?:x], 0 <= x <= cap(s) failed
|
||||
boundsSliceB // s[x:y], 0 <= x <= y failed (but boundsSliceA didn't happen)
|
||||
|
||||
boundsSlice3Alen // s[?:?:x], 0 <= x <= len(s) failed
|
||||
boundsSlice3Acap // s[?:?:x], 0 <= x <= cap(s) failed
|
||||
boundsSlice3B // s[?:x:y], 0 <= x <= y failed (but boundsSlice3A didn't happen)
|
||||
boundsSlice3C // s[x:y:?], 0 <= x <= y failed (but boundsSlice3A/B didn't happen)
|
||||
|
||||
boundsConvert // (*[x]T)(s), 0 <= x <= len(s) failed
|
||||
// Note: in the above, len(s) and cap(s) are stored in y
|
||||
)
|
||||
|
||||
// boundsErrorFmts provide error text for various out-of-bounds panics.
|
||||
// Note: if you change these strings, you should adjust the size of the buffer
|
||||
// in boundsError.Error below as well.
|
||||
var boundsErrorFmts = [...]string{
|
||||
boundsIndex: "index out of range [%x] with length %y",
|
||||
boundsSliceAlen: "slice bounds out of range [:%x] with length %y",
|
||||
boundsSliceAcap: "slice bounds out of range [:%x] with capacity %y",
|
||||
boundsSliceB: "slice bounds out of range [%x:%y]",
|
||||
boundsSlice3Alen: "slice bounds out of range [::%x] with length %y",
|
||||
boundsSlice3Acap: "slice bounds out of range [::%x] with capacity %y",
|
||||
boundsSlice3B: "slice bounds out of range [:%x:%y]",
|
||||
boundsSlice3C: "slice bounds out of range [%x:%y:]",
|
||||
boundsConvert: "cannot convert slice with length %y to array or pointer to array with length %x",
|
||||
}
|
||||
|
||||
// boundsNegErrorFmts are overriding formats if x is negative. In this case there's no need to report y.
|
||||
var boundsNegErrorFmts = [...]string{
|
||||
boundsIndex: "index out of range [%x]",
|
||||
boundsSliceAlen: "slice bounds out of range [:%x]",
|
||||
boundsSliceAcap: "slice bounds out of range [:%x]",
|
||||
boundsSliceB: "slice bounds out of range [%x:]",
|
||||
boundsSlice3Alen: "slice bounds out of range [::%x]",
|
||||
boundsSlice3Acap: "slice bounds out of range [::%x]",
|
||||
boundsSlice3B: "slice bounds out of range [:%x:]",
|
||||
boundsSlice3C: "slice bounds out of range [%x::]",
|
||||
}
|
||||
|
||||
func (e boundsError) RuntimeError() {}
|
||||
|
||||
func appendIntStr(b []byte, v int64, signed bool) []byte {
|
||||
if signed && v < 0 {
|
||||
b = append(b, '-')
|
||||
v = -v
|
||||
}
|
||||
var buf [20]byte
|
||||
b = append(b, itoa(buf[:], uint64(v))...)
|
||||
return b
|
||||
}
|
||||
|
||||
func (e boundsError) Error() string {
|
||||
fmt := boundsErrorFmts[e.code]
|
||||
if e.signed && e.x < 0 {
|
||||
fmt = boundsNegErrorFmts[e.code]
|
||||
}
|
||||
// max message length is 99: "runtime error: slice bounds out of range [::%x] with capacity %y"
|
||||
// x can be at most 20 characters. y can be at most 19.
|
||||
b := make([]byte, 0, 100)
|
||||
b = append(b, "runtime error: "...)
|
||||
for i := 0; i < len(fmt); i++ {
|
||||
c := fmt[i]
|
||||
if c != '%' {
|
||||
b = append(b, c)
|
||||
continue
|
||||
}
|
||||
i++
|
||||
switch fmt[i] {
|
||||
case 'x':
|
||||
b = appendIntStr(b, e.x, e.signed)
|
||||
case 'y':
|
||||
b = appendIntStr(b, int64(e.y), true)
|
||||
}
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
type stringer interface {
|
||||
String() string
|
||||
}
|
||||
|
||||
// printany prints an argument passed to panic.
|
||||
// If panic is called with a value that has a String or Error method,
|
||||
// it has already been converted into a string by preprintpanics.
|
||||
func printany(i any) {
|
||||
switch v := i.(type) {
|
||||
case nil:
|
||||
print("nil")
|
||||
case bool:
|
||||
print(v)
|
||||
case int:
|
||||
print(v)
|
||||
case int8:
|
||||
print(v)
|
||||
case int16:
|
||||
print(v)
|
||||
case int32:
|
||||
print(v)
|
||||
case int64:
|
||||
print(v)
|
||||
case uint:
|
||||
print(v)
|
||||
case uint8:
|
||||
print(v)
|
||||
case uint16:
|
||||
print(v)
|
||||
case uint32:
|
||||
print(v)
|
||||
case uint64:
|
||||
print(v)
|
||||
case uintptr:
|
||||
print(v)
|
||||
case float32:
|
||||
print(v)
|
||||
case float64:
|
||||
print(v)
|
||||
case complex64:
|
||||
print(v)
|
||||
case complex128:
|
||||
print(v)
|
||||
case string:
|
||||
print(v)
|
||||
default:
|
||||
printanycustomtype(i)
|
||||
}
|
||||
}
|
||||
|
||||
func printanycustomtype(i any) {
|
||||
eface := efaceOf(&i)
|
||||
typestring := toRType(eface._type).string()
|
||||
|
||||
switch eface._type.Kind_ {
|
||||
case kindString:
|
||||
print(typestring, `("`, *(*string)(eface.data), `")`)
|
||||
case kindBool:
|
||||
print(typestring, "(", *(*bool)(eface.data), ")")
|
||||
case kindInt:
|
||||
print(typestring, "(", *(*int)(eface.data), ")")
|
||||
case kindInt8:
|
||||
print(typestring, "(", *(*int8)(eface.data), ")")
|
||||
case kindInt16:
|
||||
print(typestring, "(", *(*int16)(eface.data), ")")
|
||||
case kindInt32:
|
||||
print(typestring, "(", *(*int32)(eface.data), ")")
|
||||
case kindInt64:
|
||||
print(typestring, "(", *(*int64)(eface.data), ")")
|
||||
case kindUint:
|
||||
print(typestring, "(", *(*uint)(eface.data), ")")
|
||||
case kindUint8:
|
||||
print(typestring, "(", *(*uint8)(eface.data), ")")
|
||||
case kindUint16:
|
||||
print(typestring, "(", *(*uint16)(eface.data), ")")
|
||||
case kindUint32:
|
||||
print(typestring, "(", *(*uint32)(eface.data), ")")
|
||||
case kindUint64:
|
||||
print(typestring, "(", *(*uint64)(eface.data), ")")
|
||||
case kindUintptr:
|
||||
print(typestring, "(", *(*uintptr)(eface.data), ")")
|
||||
case kindFloat32:
|
||||
print(typestring, "(", *(*float32)(eface.data), ")")
|
||||
case kindFloat64:
|
||||
print(typestring, "(", *(*float64)(eface.data), ")")
|
||||
case kindComplex64:
|
||||
print(typestring, *(*complex64)(eface.data))
|
||||
case kindComplex128:
|
||||
print(typestring, *(*complex128)(eface.data))
|
||||
default:
|
||||
print("(", typestring, ") ", eface.data)
|
||||
}
|
||||
}
|
||||
|
||||
// panicwrap generates a panic for a call to a wrapped value method
|
||||
// with a nil pointer receiver.
|
||||
//
|
||||
// It is called from the generated wrapper code.
|
||||
func panicwrap() {
|
||||
pc := getcallerpc()
|
||||
name := funcNameForPrint(funcname(findfunc(pc)))
|
||||
// name is something like "main.(*T).F".
|
||||
// We want to extract pkg ("main"), typ ("T"), and meth ("F").
|
||||
// Do it by finding the parens.
|
||||
i := bytealg.IndexByteString(name, '(')
|
||||
if i < 0 {
|
||||
throw("panicwrap: no ( in " + name)
|
||||
}
|
||||
pkg := name[:i-1]
|
||||
if i+2 >= len(name) || name[i-1:i+2] != ".(*" {
|
||||
throw("panicwrap: unexpected string after package name: " + name)
|
||||
}
|
||||
name = name[i+2:]
|
||||
i = bytealg.IndexByteString(name, ')')
|
||||
if i < 0 {
|
||||
throw("panicwrap: no ) in " + name)
|
||||
}
|
||||
if i+2 >= len(name) || name[i:i+2] != ")." {
|
||||
throw("panicwrap: unexpected string after type name: " + name)
|
||||
}
|
||||
typ := name[:i]
|
||||
meth := name[i+2:]
|
||||
panic(plainError("value method " + pkg + "." + typ + "." + meth + " called using nil *" + typ + " pointer"))
|
||||
}
|
||||
*/
|
||||
Reference in New Issue
Block a user