mirror of
https://github.com/golang/go
synced 2024-11-12 09:10:21 -07:00
gob: updates to the debugging tool.
- complex numbers now supported. - entirely independent of standard decode code. - parser has no read-ahead; that is, the scanning works simply by reading the values as they arrive, not by trying to count bytes for message boundaries, a proof of concept for the pending rewrite of the regular decoder. R=rsc, r2 CC=golang-dev https://golang.org/cl/4084044
This commit is contained in:
Rob Pike
parent
634cef25c3
commit
04a8905442
@ -98,26 +98,38 @@ func (p *peekReader) peek(b []byte) (n int, err os.Error) {
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return n, e
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}
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type debugger struct {
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mutex sync.Mutex
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remain int // the number of bytes known to remain in the input
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remainingKnown bool // the value of 'remain' is valid
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r *peekReader
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wireType map[typeId]*wireType
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tmp []byte // scratch space for decoding uints.
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}
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// dump prints the next nBytes of the input.
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// It arranges to print the output aligned from call to
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// call, to make it easy to see what has been consumed.
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func (deb *debugger) dump(nBytes int, format string, args ...interface{}) {
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func (deb *debugger) dump(format string, args ...interface{}) {
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if !dumpBytes {
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return
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}
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fmt.Fprintf(os.Stderr, format+" ", args...)
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if nBytes < 0 {
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fmt.Fprintf(os.Stderr, "nbytes is negative! %d\n", nBytes)
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if !deb.remainingKnown {
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return
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}
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data := make([]byte, nBytes)
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if deb.remain < 0 {
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fmt.Fprintf(os.Stderr, "remaining byte count is negative! %d\n", deb.remain)
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return
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}
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data := make([]byte, deb.remain)
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n, _ := deb.r.peek(data)
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if n == 0 {
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os.Stderr.Write(empty)
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return
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}
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b := new(bytes.Buffer)
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fmt.Fprint(b, "{\n")
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fmt.Fprintf(b, "[%d]{\n", deb.remain)
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// Blanks until first byte
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lineLength := 0
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if n := len(data); n%10 != 0 {
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@ -141,13 +153,6 @@ func (deb *debugger) dump(nBytes int, format string, args ...interface{}) {
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os.Stderr.Write(b.Bytes())
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}
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type debugger struct {
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mutex sync.Mutex
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r *peekReader
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wireType map[typeId]*wireType
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tmp []byte // scratch space for decoding uints.
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}
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// Debug prints a human-readable representation of the gob data read from r.
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func Debug(r io.Reader) {
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fmt.Fprintln(os.Stderr, "Start of debugging")
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@ -156,37 +161,36 @@ func Debug(r io.Reader) {
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wireType: make(map[typeId]*wireType),
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tmp: make([]byte, 16),
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}
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if b, ok := r.(*bytes.Buffer); ok {
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deb.remain = b.Len()
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deb.remainingKnown = true
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}
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deb.gobStream()
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}
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// toInt turns an encoded uint64 into an int, according to the marshaling rules.
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func toInt(x uint64) int64 {
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i := int64(x >> 1)
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if x&1 != 0 {
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i = ^i
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// note that we've consumed some bytes
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func (deb *debugger) consumed(n int) {
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if deb.remainingKnown {
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deb.remain -= n
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}
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return i
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}
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// readInt returns the next int, which must be present,
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// and the number of bytes it consumed.
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// int64 decodes and returns the next integer, which must be present.
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// Don't call this if you could be at EOF.
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func (deb *debugger) readInt() (i int64, w int) {
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var u uint64
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u, w = deb.readUint()
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return toInt(u), w
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func (deb *debugger) int64() int64 {
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return toInt(deb.uint64())
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}
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// readUint returns the next uint, which must be present.
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// and the number of bytes it consumed.
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// uint64 returns and decodes the next unsigned integer, which must be present.
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// Don't call this if you could be at EOF.
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// TODO: handle errors better.
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func (deb *debugger) readUint() (x uint64, w int) {
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func (deb *debugger) uint64() uint64 {
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n, w, err := decodeUintReader(deb.r, deb.tmp)
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if err != nil {
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errorf("debug: read error: %s", err)
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}
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return n, w
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deb.consumed(w)
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return n
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}
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// GobStream:
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@ -208,8 +212,8 @@ func (deb *debugger) delimitedMessage(indent tab) bool {
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if n < 0 {
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return false
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}
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deb.dump(int(n), "Message of length %d", n)
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deb.message(indent, n)
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deb.dump("Delimited message of length %d", n)
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deb.message(indent)
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}
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return true
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}
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@ -220,18 +224,19 @@ func (deb *debugger) delimitedMessage(indent tab) bool {
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// an EOF is acceptable now. If it is and one is found,
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// the return value is negative.
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func (deb *debugger) loadBlock(eofOK bool) int {
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n64, _, err := decodeUintReader(deb.r, deb.tmp)
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n64, w, err := decodeUintReader(deb.r, deb.tmp) // deb.uint64 will error at EOF
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if err != nil {
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if eofOK && err == os.EOF {
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return -1
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}
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errorf("debug: unexpected error: %s", err)
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}
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deb.consumed(w)
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n := int(n64)
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if n < 0 {
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errorf("huge value for message length: %d", n64)
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}
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return n
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return int(n)
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}
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// Message:
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@ -242,209 +247,198 @@ func (deb *debugger) loadBlock(eofOK bool) int {
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// uint(lengthOfTypeDefinition) TypeDefinition
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// TypedValue:
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// int(typeId) Value
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func (deb *debugger) message(indent tab, n int) bool {
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func (deb *debugger) message(indent tab) bool {
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for {
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// Convert the uint64 to a signed integer typeId
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uid, w := deb.readInt()
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uid := deb.int64()
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id := typeId(uid)
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n -= w
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deb.dump(n, "type id=%d", id)
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deb.dump("type id=%d", id)
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if id < 0 {
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n -= deb.typeDefinition(indent, -id, n)
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n = deb.loadBlock(false)
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deb.dump(n, "Message of length %d", n)
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deb.typeDefinition(indent, -id)
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n := deb.loadBlock(false)
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deb.dump("Message of length %d", n)
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continue
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} else {
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deb.value(indent, id, n)
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deb.value(indent, id)
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break
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}
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}
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return true
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}
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// Helper methods to make it easy to scan a type descriptor.
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// common returns the CommonType at the input point.
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func (deb *debugger) common() CommonType {
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fieldNum := -1
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name := ""
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id := typeId(0)
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for {
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delta := deb.delta(-1)
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if delta == 0 {
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break
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}
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fieldNum += delta
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switch fieldNum {
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case 0:
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name = deb.string()
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case 1:
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// Id typeId
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id = deb.typeId()
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default:
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errorf("corrupted CommonType")
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}
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}
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return CommonType{name, id}
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}
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// uint returns the unsigned int at the input point, as a uint (not uint64).
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func (deb *debugger) uint() uint {
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return uint(deb.uint64())
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}
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// int returns the signed int at the input point, as an int (not int64).
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func (deb *debugger) int() int {
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return int(deb.int64())
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}
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// typeId returns the type id at the input point.
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func (deb *debugger) typeId() typeId {
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return typeId(deb.int64())
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}
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// string returns the string at the input point.
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func (deb *debugger) string() string {
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x := int(deb.uint64())
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b := make([]byte, x)
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nb, _ := deb.r.Read(b)
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if nb != x {
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errorf("corrupted type")
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}
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deb.consumed(nb)
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return string(b)
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}
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// delta returns the field delta at the input point. The expect argument,
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// if non-negative, identifies what the value should be.
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func (deb *debugger) delta(expect int) int {
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delta := int(deb.uint64())
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if delta < 0 || (expect >= 0 && delta != expect) {
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errorf("gob decode: corrupted type: delta %d expected %d", delta, expect)
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}
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return delta
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}
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// TypeDefinition:
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// [int(-typeId) (already read)] encodingOfWireType
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func (deb *debugger) typeDefinition(indent tab, id typeId, n int) int {
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deb.dump(n, "type definition for id %d", id)
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func (deb *debugger) typeDefinition(indent tab, id typeId) {
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deb.dump("type definition for id %d", id)
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// Encoding is of a wireType. Decode the structure as usual
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fieldNum := -1
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m := 0
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// Closures to make it easy to scan.
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// Read a uint from the input
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getUint := func() uint {
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i, w := deb.readUint()
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m += w
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n -= w
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return uint(i)
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}
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// Read an int from the input
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getInt := func() int {
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i, w := deb.readInt()
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m += w
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n -= w
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return int(i)
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}
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// Read a string from the input
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getString := func() string {
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u, w := deb.readUint()
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x := int(u)
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m += w
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n -= w
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b := make([]byte, x)
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nb, _ := deb.r.Read(b)
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if nb != x {
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errorf("corrupted type")
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}
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m += x
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n -= x
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return string(b)
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}
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// Read a typeId from the input
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getTypeId := func() typeId {
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return typeId(getInt())
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}
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// Read a delta from the input.
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getDelta := func(expect int) int {
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u, w := deb.readUint()
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m += w
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n -= w
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delta := int(u)
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if delta < 0 || (expect >= 0 && delta != expect) {
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errorf("gob decode: corrupted type: delta %d expected %d", delta, expect)
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}
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return int(u)
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}
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// Read a CommonType from the input
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common := func() CommonType {
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fieldNum := -1
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name := ""
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id := typeId(0)
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for {
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delta := getDelta(-1)
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if delta == 0 {
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break
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}
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fieldNum += delta
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switch fieldNum {
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case 0:
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name = getString()
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case 1:
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// Id typeId
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id = getTypeId()
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default:
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errorf("corrupted CommonType")
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}
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}
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return CommonType{name, id}
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}
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wire := new(wireType)
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// A wireType defines a single field.
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delta := getDelta(-1)
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delta := deb.delta(-1)
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fieldNum += delta
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switch fieldNum {
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case 0: // array type, one field of {{Common}, elem, length}
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// Field number 0 is CommonType
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getDelta(1)
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com := common()
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deb.delta(1)
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com := deb.common()
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// Field number 1 is type Id of elem
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getDelta(1)
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id := getTypeId()
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deb.delta(1)
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id := deb.typeId()
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// Field number 3 is length
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getDelta(1)
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length := getInt()
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deb.delta(1)
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length := deb.int()
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wire.ArrayT = &arrayType{com, id, length}
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case 1: // slice type, one field of {{Common}, elem}
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// Field number 0 is CommonType
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getDelta(1)
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com := common()
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deb.delta(1)
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com := deb.common()
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// Field number 1 is type Id of elem
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getDelta(1)
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id := getTypeId()
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deb.delta(1)
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id := deb.typeId()
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wire.SliceT = &sliceType{com, id}
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case 2: // struct type, one field of {{Common}, []fieldType}
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// Field number 0 is CommonType
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getDelta(1)
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com := common()
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deb.delta(1)
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com := deb.common()
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// Field number 1 is slice of FieldType
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getDelta(1)
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numField := int(getUint())
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deb.delta(1)
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numField := int(deb.uint())
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field := make([]*fieldType, numField)
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for i := 0; i < numField; i++ {
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field[i] = new(fieldType)
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getDelta(1) // field 0 of fieldType: name
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field[i].Name = getString()
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getDelta(1) // field 1 of fieldType: id
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field[i].Id = getTypeId()
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getDelta(0) // end of fieldType
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deb.delta(1) // field 0 of fieldType: name
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field[i].Name = deb.string()
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deb.delta(1) // field 1 of fieldType: id
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field[i].Id = deb.typeId()
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deb.delta(0) // end of fieldType
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}
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wire.StructT = &structType{com, field}
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case 3: // map type, one field of {{Common}, key, elem}
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// Field number 0 is CommonType
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getDelta(1)
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com := common()
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deb.delta(1)
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com := deb.common()
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// Field number 1 is type Id of key
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getDelta(1)
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keyId := getTypeId()
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deb.delta(1)
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keyId := deb.typeId()
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wire.SliceT = &sliceType{com, id}
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// Field number 2 is type Id of elem
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getDelta(1)
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elemId := getTypeId()
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deb.delta(1)
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elemId := deb.typeId()
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wire.MapT = &mapType{com, keyId, elemId}
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default:
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errorf("bad field in type %d", fieldNum)
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}
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deb.printWireType(indent, wire)
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getDelta(0) // end inner type (arrayType, etc.)
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getDelta(0) // end wireType
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deb.delta(0) // end inner type (arrayType, etc.)
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deb.delta(0) // end wireType
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// Remember we've seen this type.
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deb.wireType[id] = wire
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return m
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}
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// Value:
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// SingletonValue | StructValue
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func (deb *debugger) value(indent tab, id typeId, n int) int {
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func (deb *debugger) value(indent tab, id typeId) {
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wire, ok := deb.wireType[id]
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if ok && wire.StructT != nil {
|
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return deb.structValue(indent, id, n)
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deb.structValue(indent, id)
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} else {
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deb.singletonValue(indent, id)
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}
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return deb.singletonValue(indent, id, n)
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||||
}
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||||
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||||
// SingletonValue:
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// uint(0) FieldValue
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func (deb *debugger) singletonValue(indent tab, id typeId, n int) int {
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deb.dump(n, "Singleton value")
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func (deb *debugger) singletonValue(indent tab, id typeId) {
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deb.dump("Singleton value")
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||||
// is it a builtin type?
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||||
wire := deb.wireType[id]
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||||
_, ok := builtinIdToType[id]
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if !ok && wire == nil {
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||||
errorf("type id %d not defined", id)
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||||
}
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||||
m, w := deb.readUint()
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||||
m := deb.uint64()
|
||||
if m != 0 {
|
||||
errorf("expected zero; got %d", n)
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||||
errorf("expected zero; got %d", m)
|
||||
}
|
||||
return w + deb.fieldValue(indent, id, n-w)
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||||
deb.fieldValue(indent, id)
|
||||
}
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||||
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||||
// InterfaceValue:
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||||
// NilInterfaceValue | NonNilInterfaceValue
|
||||
func (deb *debugger) interfaceValue(indent tab, n int) int {
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deb.dump(n, "Start of interface value")
|
||||
nameLen, w := deb.readUint()
|
||||
n -= w
|
||||
if n == 0 {
|
||||
return w + deb.nilInterfaceValue(indent)
|
||||
func (deb *debugger) interfaceValue(indent tab) {
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||||
deb.dump("Start of interface value")
|
||||
if nameLen := deb.uint64(); nameLen == 0 {
|
||||
deb.nilInterfaceValue(indent)
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||||
} else {
|
||||
deb.nonNilInterfaceValue(indent, int(nameLen))
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||||
}
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||||
return w + deb.nonNilInterfaceValue(indent, int(nameLen), n)
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||||
}
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||||
|
||||
// NilInterfaceValue:
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||||
@ -463,35 +457,27 @@ func (deb *debugger) nilInterfaceValue(indent tab) int {
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||||
// int(concreteTypeId) DelimitedValue
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||||
// DelimitedValue:
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||||
// uint(length) Value
|
||||
func (deb *debugger) nonNilInterfaceValue(indent tab, nameLen, n int) int {
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||||
func (deb *debugger) nonNilInterfaceValue(indent tab, nameLen int) {
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||||
// ConcreteTypeName
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||||
b := make([]byte, nameLen)
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||||
deb.r.Read(b) // TODO: CHECK THESE READS!!
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||||
w := nameLen
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||||
n -= nameLen
|
||||
deb.consumed(nameLen)
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||||
name := string(b)
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fmt.Fprintf(os.Stderr, "%sinterface value, type %q length %d\n", indent, name, n)
|
||||
|
||||
for {
|
||||
x, width := deb.readInt()
|
||||
n -= w
|
||||
w += width
|
||||
id := typeId(x)
|
||||
id := deb.typeId()
|
||||
if id < 0 {
|
||||
deb.typeDefinition(indent, -id, n)
|
||||
n = deb.loadBlock(false)
|
||||
deb.dump(n, "Message of length %d", n)
|
||||
deb.typeDefinition(indent, -id)
|
||||
n := deb.loadBlock(false)
|
||||
deb.dump("Nested message of length %d", n)
|
||||
} else {
|
||||
// DelimitedValue
|
||||
x, width := deb.readUint() // in case we want to ignore the value; we don't.
|
||||
n -= w
|
||||
w += width
|
||||
fmt.Fprintf(os.Stderr, "%sinterface value, type %q id=%d; length %d\n", indent, name, id, x)
|
||||
ZZ := w + deb.value(indent, id, int(x))
|
||||
return ZZ
|
||||
x := deb.uint64() // in case we want to ignore the value; we don't.
|
||||
fmt.Fprintf(os.Stderr, "%sinterface value, type %q id=%d; valueLength %d\n", indent, name, id, x)
|
||||
deb.value(indent, id)
|
||||
break
|
||||
}
|
||||
}
|
||||
panic("not reached")
|
||||
}
|
||||
|
||||
// printCommonType prints a common type; used by printWireType.
|
||||
@ -529,13 +515,15 @@ func (deb *debugger) printWireType(indent tab, wire *wireType) {
|
||||
// fieldValue prints a value of any type, such as a struct field.
|
||||
// FieldValue:
|
||||
// builtinValue | ArrayValue | MapValue | SliceValue | StructValue | InterfaceValue
|
||||
func (deb *debugger) fieldValue(indent tab, id typeId, n int) int {
|
||||
func (deb *debugger) fieldValue(indent tab, id typeId) {
|
||||
_, ok := builtinIdToType[id]
|
||||
if ok {
|
||||
if id == tInterface {
|
||||
return deb.interfaceValue(indent, n)
|
||||
deb.interfaceValue(indent)
|
||||
} else {
|
||||
deb.printBuiltin(indent, id)
|
||||
}
|
||||
return deb.printBuiltin(indent, id, n)
|
||||
return
|
||||
}
|
||||
wire, ok := deb.wireType[id]
|
||||
if !ok {
|
||||
@ -543,105 +531,104 @@ func (deb *debugger) fieldValue(indent tab, id typeId, n int) int {
|
||||
}
|
||||
switch {
|
||||
case wire.ArrayT != nil:
|
||||
return deb.arrayValue(indent, wire, n)
|
||||
deb.arrayValue(indent, wire)
|
||||
case wire.MapT != nil:
|
||||
return deb.mapValue(indent, wire, n)
|
||||
deb.mapValue(indent, wire)
|
||||
case wire.SliceT != nil:
|
||||
return deb.sliceValue(indent, wire, n)
|
||||
deb.sliceValue(indent, wire)
|
||||
case wire.StructT != nil:
|
||||
return deb.structValue(indent, id, n)
|
||||
deb.structValue(indent, id)
|
||||
default:
|
||||
panic("bad wire type for field")
|
||||
}
|
||||
panic("unreached")
|
||||
}
|
||||
|
||||
// printBuiltin prints a value not of a fundamental type, that is,
|
||||
// one whose type is known to gobs at bootstrap time.
|
||||
func (deb *debugger) printBuiltin(indent tab, id typeId, n int) int {
|
||||
func (deb *debugger) printBuiltin(indent tab, id typeId) {
|
||||
switch id {
|
||||
case tBool:
|
||||
x, w := deb.readInt()
|
||||
x := deb.int64()
|
||||
if x == 0 {
|
||||
fmt.Fprintf(os.Stderr, "%sfalse\n", indent)
|
||||
} else {
|
||||
fmt.Fprintf(os.Stderr, "%strue\n", indent)
|
||||
}
|
||||
return w
|
||||
case tInt:
|
||||
x, w := deb.readInt()
|
||||
x := deb.int64()
|
||||
fmt.Fprintf(os.Stderr, "%s%d\n", indent, x)
|
||||
return w
|
||||
case tUint:
|
||||
x, w := deb.readInt()
|
||||
x := deb.int64()
|
||||
fmt.Fprintf(os.Stderr, "%s%d\n", indent, x)
|
||||
return w
|
||||
case tFloat:
|
||||
x, w := deb.readUint()
|
||||
x := deb.uint64()
|
||||
fmt.Fprintf(os.Stderr, "%s%g\n", indent, floatFromBits(x))
|
||||
return w
|
||||
case tComplex:
|
||||
r := deb.uint64()
|
||||
i := deb.uint64()
|
||||
fmt.Fprintf(os.Stderr, "%s%g+%gi\n", indent, floatFromBits(r), floatFromBits(i))
|
||||
case tBytes:
|
||||
x, w := deb.readUint()
|
||||
x := int(deb.uint64())
|
||||
b := make([]byte, x)
|
||||
deb.r.Read(b)
|
||||
deb.consumed(x)
|
||||
fmt.Fprintf(os.Stderr, "%s{% x}=%q\n", indent, b, b)
|
||||
return w + int(x)
|
||||
case tString:
|
||||
x, w := deb.readUint()
|
||||
x := int(deb.uint64())
|
||||
b := make([]byte, x)
|
||||
deb.r.Read(b)
|
||||
deb.consumed(x)
|
||||
fmt.Fprintf(os.Stderr, "%s%q\n", indent, b)
|
||||
return w + int(x)
|
||||
default:
|
||||
fmt.Print("unknown\n")
|
||||
panic("unknown builtin")
|
||||
}
|
||||
panic("unknown builtin")
|
||||
}
|
||||
|
||||
|
||||
// ArrayValue:
|
||||
// uint(n) FieldValue*n
|
||||
func (deb *debugger) arrayValue(indent tab, wire *wireType, n int) int {
|
||||
func (deb *debugger) arrayValue(indent tab, wire *wireType) {
|
||||
elemId := wire.ArrayT.Elem
|
||||
u, w := deb.readUint()
|
||||
u := deb.uint64()
|
||||
length := int(u)
|
||||
for i := 0; i < length; i++ {
|
||||
w += deb.fieldValue(indent, elemId, n-w)
|
||||
deb.fieldValue(indent, elemId)
|
||||
}
|
||||
if length != wire.ArrayT.Len {
|
||||
fmt.Fprintf(os.Stderr, "%s(wrong length for array: %d should be %d)\n", indent, length, wire.ArrayT.Len)
|
||||
}
|
||||
return w
|
||||
}
|
||||
|
||||
// MapValue:
|
||||
// uint(n) (FieldValue FieldValue)*n [n (key, value) pairs]
|
||||
func (deb *debugger) mapValue(indent tab, wire *wireType, n int) int {
|
||||
func (deb *debugger) mapValue(indent tab, wire *wireType) {
|
||||
keyId := wire.MapT.Key
|
||||
elemId := wire.MapT.Elem
|
||||
u, w := deb.readUint()
|
||||
u := deb.uint64()
|
||||
length := int(u)
|
||||
for i := 0; i < length; i++ {
|
||||
w += deb.fieldValue(indent+1, keyId, n-w)
|
||||
w += deb.fieldValue(indent+1, elemId, n-w)
|
||||
deb.fieldValue(indent+1, keyId)
|
||||
deb.fieldValue(indent+1, elemId)
|
||||
}
|
||||
return w
|
||||
}
|
||||
|
||||
// SliceValue:
|
||||
// uint(n) (n FieldValue)
|
||||
func (deb *debugger) sliceValue(indent tab, wire *wireType, n int) int {
|
||||
func (deb *debugger) sliceValue(indent tab, wire *wireType) {
|
||||
elemId := wire.SliceT.Elem
|
||||
u, w := deb.readUint()
|
||||
u := deb.uint64()
|
||||
length := int(u)
|
||||
deb.dump("Start of slice of length %d", length)
|
||||
|
||||
for i := 0; i < length; i++ {
|
||||
w += deb.fieldValue(indent, elemId, n-w)
|
||||
deb.fieldValue(indent, elemId)
|
||||
}
|
||||
return w
|
||||
}
|
||||
|
||||
// StructValue:
|
||||
// (uint(fieldDelta) FieldValue)*
|
||||
func (deb *debugger) structValue(indent tab, id typeId, n int) int {
|
||||
deb.dump(n, "Start of struct value of %q id=%d\n<<\n", id.name(), id)
|
||||
func (deb *debugger) structValue(indent tab, id typeId) {
|
||||
deb.dump("Start of struct value of %q id=%d\n<<\n", id.name(), id)
|
||||
fmt.Fprintf(os.Stderr, "%s%s struct {\n", indent, id.name())
|
||||
wire, ok := deb.wireType[id]
|
||||
if !ok {
|
||||
@ -650,26 +637,20 @@ func (deb *debugger) structValue(indent tab, id typeId, n int) int {
|
||||
strct := wire.StructT
|
||||
fieldNum := -1
|
||||
indent++
|
||||
w := 0
|
||||
for {
|
||||
delta, wid := deb.readUint()
|
||||
w += wid
|
||||
n -= wid
|
||||
delta := deb.uint64()
|
||||
if delta == 0 { // struct terminator is zero delta fieldnum
|
||||
break
|
||||
}
|
||||
fieldNum += int(delta)
|
||||
if fieldNum < 0 || fieldNum >= len(strct.Field) {
|
||||
deb.dump(n, "field number out of range: prevField=%d delta=%d", fieldNum-int(delta), delta)
|
||||
deb.dump("field number out of range: prevField=%d delta=%d", fieldNum-int(delta), delta)
|
||||
break
|
||||
}
|
||||
fmt.Fprintf(os.Stderr, "%sfield %d:\t%s\n", indent, fieldNum, wire.StructT.Field[fieldNum].Name)
|
||||
wid = deb.fieldValue(indent+1, strct.Field[fieldNum].Id, n)
|
||||
w += wid
|
||||
n -= wid
|
||||
deb.fieldValue(indent+1, strct.Field[fieldNum].Id)
|
||||
}
|
||||
indent--
|
||||
fmt.Fprintf(os.Stderr, "%s} // end %s struct\n", indent, id.name())
|
||||
deb.dump(n, ">> End of struct value of type %d %q", id, id.name())
|
||||
return w
|
||||
deb.dump(">> End of struct value of type %d %q", id, id.name())
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user