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Commit b9689433 authored by Rob Pike's avatar Rob Pike
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scalar decoders 

R=rsc
DELTA=897  (728 added, 14 deleted, 155 changed)
OCL=30955
CL=30955
parent 79b2cf92
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Inline Side-by-side
Showing with 799 additions and 85 deletions
src/pkg/gob/codec_test.go
View file @ b9689433
......@@ -11,6 +11,7 @@ import (
"testing";
"unsafe";
)
import "fmt" // TODO DELETE
// Guarantee encoding format by comparing some encodings to hand-written values
type EncodeT struct {
......@@ -117,7 +118,7 @@ var floatResult = []byte{0x80, 0x40, 0xe2, 0x81, 0x40, 0xe2, 0x82, 0x40, 0xe2}
// Do not run the machine yet; instead do individual instructions crafted by hand.
func TestScalarEncInstructions(t *testing.T) {
var b = new(bytes.Buffer);
var state EncState;
state := new(EncState);
// bool
{
......@@ -129,15 +130,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encBool, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(boolResult, b.Data()) {
t.Errorf("bool enc instructions: expected % x got % x", boolResult, b.Data())
}
......@@ -153,15 +154,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encInt, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(signedResult, b.Data()) {
t.Errorf("int enc instructions: expected % x got % x", signedResult, b.Data())
}
......@@ -177,15 +178,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encUint, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(unsignedResult, b.Data()) {
t.Errorf("uint enc instructions: expected % x got % x", unsignedResult, b.Data())
}
......@@ -201,15 +202,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encInt, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(signedResult, b.Data()) {
t.Errorf("int8 enc instructions: expected % x got % x", signedResult, b.Data())
}
......@@ -225,15 +226,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encUint, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(unsignedResult, b.Data()) {
t.Errorf("uint8 enc instructions: expected % x got % x", unsignedResult, b.Data())
}
......@@ -249,15 +250,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encInt16, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(signedResult, b.Data()) {
t.Errorf("int16 enc instructions: expected % x got % x", signedResult, b.Data())
}
......@@ -273,15 +274,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encUint16, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(unsignedResult, b.Data()) {
t.Errorf("uint16 enc instructions: expected % x got % x", unsignedResult, b.Data())
}
......@@ -297,15 +298,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encInt32, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(signedResult, b.Data()) {
t.Errorf("int32 enc instructions: expected % x got % x", signedResult, b.Data())
}
......@@ -321,15 +322,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encUint32, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(unsignedResult, b.Data()) {
t.Errorf("uint32 enc instructions: expected % x got % x", unsignedResult, b.Data())
}
......@@ -345,15 +346,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encInt64, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(signedResult, b.Data()) {
t.Errorf("int64 enc instructions: expected % x got % x", signedResult, b.Data())
}
......@@ -369,15 +370,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encUint, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(unsignedResult, b.Data()) {
t.Errorf("uint64 enc instructions: expected % x got % x", unsignedResult, b.Data())
}
......@@ -393,15 +394,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encFloat, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(floatResult, b.Data()) {
t.Errorf("float enc instructions: expected % x got % x", floatResult, b.Data())
}
......@@ -417,15 +418,15 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encFloat32, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(floatResult, b.Data()) {
t.Errorf("float32 enc instructions: expected % x got % x", floatResult, b.Data())
}
......@@ -441,17 +442,453 @@ func TestScalarEncInstructions(t *testing.T) {
instr := &encInstr{ encFloat64, 0, 0, 0 };
state.w = b;
state.base = uintptr(unsafe.Pointer(&data));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
instr.op(instr, &state);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
instr.op(instr, &state);
instr.op(instr, state);
if !bytes.Equal(floatResult, b.Data()) {
t.Errorf("float64 enc instructions: expected % x got % x", floatResult, b.Data())
}
}
}
func expectField(n int, state *DecState, t *testing.T) {
v := int(DecodeUint(state));
if state.err != nil {
t.Fatalf("decoding field number %d: %v", n, state.err);
}
if v != n {
t.Fatalf("decoding field number %d, got %d", n, v);
}
}
// Test instruction execution for decoding.
// Do not run the machine yet; instead do individual instructions crafted by hand.
func TestScalarDecInstructions(t *testing.T) {
state := new(DecState);
// bool
{
b := bytes.NewBuffer(boolResult);
var data struct { a bool; b *bool; c **bool };
instr := &decInstr{ decBool, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != true {
t.Errorf("int a = %v not true", data.a)
}
if *data.b != true {
t.Errorf("int b = %v not true", *data.b)
}
if **data.c != true {
t.Errorf("int c = %v not true", **data.c)
}
}
// int
{
b := bytes.NewBuffer(signedResult);
var data struct { a int; b *int; c **int };
instr := &decInstr{ decInt, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// uint
{
b := bytes.NewBuffer(unsignedResult);
var data struct { a uint; b *uint; c **uint };
instr := &decInstr{ decUint, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// int8
{
b := bytes.NewBuffer(signedResult);
var data struct { a int8; b *int8; c **int8 };
instr := &decInstr{ decInt8, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// uint8
{
b := bytes.NewBuffer(unsignedResult);
var data struct { a uint8; b *uint8; c **uint8 };
instr := &decInstr{ decUint8, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// int16
{
b := bytes.NewBuffer(signedResult);
var data struct { a int16; b *int16; c **int16 };
instr := &decInstr{ decInt16, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// uint16
{
b := bytes.NewBuffer(unsignedResult);
var data struct { a uint16; b *uint16; c **uint16 };
instr := &decInstr{ decUint16, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// int32
{
b := bytes.NewBuffer(signedResult);
var data struct { a int32; b *int32; c **int32 };
instr := &decInstr{ decInt32, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// uint32
{
b := bytes.NewBuffer(unsignedResult);
var data struct { a uint32; b *uint32; c **uint32 };
instr := &decInstr{ decUint32, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// int64
{
b := bytes.NewBuffer(signedResult);
var data struct { a int64; b *int64; c **int64 };
instr := &decInstr{ decInt64, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// uint64
{
b := bytes.NewBuffer(unsignedResult);
var data struct { a uint64; b *uint64; c **uint64 };
instr := &decInstr{ decUint64, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// float
{
b := bytes.NewBuffer(floatResult);
var data struct { a float; b *float; c **float };
instr := &decInstr{ decFloat, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// float32
{
b := bytes.NewBuffer(floatResult);
var data struct { a float32; b *float32; c **float32 };
instr := &decInstr{ decFloat32, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
// float64
{
b := bytes.NewBuffer(floatResult);
var data struct { a float64; b *float64; c **float64 };
instr := &decInstr{ decFloat64, 0, 0, 0 };
state.r = b;
state.base = uintptr(unsafe.Pointer(&data));
expectField(0, state, t);
instr.op(instr, state);
instr.field = 1;
instr.indir = 1;
instr.offset = uintptr(unsafe.Offsetof(data.b));
expectField(1, state, t);
instr.op(instr, state);
instr.field = 2;
instr.indir = 2;
instr.offset = uintptr(unsafe.Offsetof(data.c));
expectField(2, state, t);
instr.op(instr, state);
if data.a != 17 {
t.Errorf("int a = %v not 17", data.a)
}
if *data.b != 17 {
t.Errorf("int b = %v not 17", *data.b)
}
if **data.c != 17 {
t.Errorf("int c = %v not 17", **data.c)
}
}
}
src/pkg/gob/decode.go
View file @ b9689433
......@@ -6,6 +6,7 @@ package gob
import (
"io";
"math";
"os";
"unsafe";
)
......@@ -52,3 +53,283 @@ func DecodeInt(state *DecState) int64 {
}
return int64(x >> 1)
}
// The 'instructions' of the decoding machine
type decInstr struct {
op func(i *decInstr, state *DecState);
field int; // field number
indir int; // how many pointer indirections to reach the value in the struct
offset uintptr; // offset in the structure of the field to encode
}
// Since the encoder writes no zeros, if we arrive at a decoder we have
// a value to extract and store. The field number has already been read
// (it's how we knew to call this decoder).
// Each decoder is responsible for handling any indirections associated
// with the data structure. If any pointer so reached is nil, allocation must
// be done.
// Walk the pointer hierarchy, allocating if we find a nil. Stop one before the end.
func decIndirect(p unsafe.Pointer, indir int) unsafe.Pointer {
for ; indir > 1; indir-- {
if *(*unsafe.Pointer)(p) == nil {
// Allocation required
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(unsafe.Pointer));
}
p = *(*unsafe.Pointer)(p);
}
return p
}
func decBool(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int(DecodeInt(state));
if state.err == nil {
*(*bool)(p) = v != 0;
}
}
func decInt(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int(DecodeInt(state));
if state.err == nil {
*(*int)(p) = v;
}
}
func decUint(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := uint(DecodeUint(state));
if state.err == nil {
*(*uint)(p) = v;
}
}
func decInt8(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int8(DecodeInt(state));
if state.err == nil {
*(*int8)(p) = v;
}
}
func decUint8(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := uint8(DecodeUint(state));
if state.err == nil {
*(*uint8)(p) = v;
}
}
func decInt16(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int16(DecodeInt(state));
if state.err == nil {
*(*int16)(p) = v;
}
}
func decUint16(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := uint16(DecodeUint(state));
if state.err == nil {
*(*uint16)(p) = v;
}
}
func decInt32(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int32(DecodeInt(state));
if state.err == nil {
*(*int32)(p) = v;
}
}
func decUint32(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := uint32(DecodeUint(state));
if state.err == nil {
*(*uint32)(p) = v;
}
}
func decInt64(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := int64(DecodeInt(state));
if state.err == nil {
*(*int64)(p) = v;
}
}
func decUint64(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := uint64(DecodeUint(state));
if state.err == nil {
*(*uint64)(p) = v;
}
}
// Floating-point numbers are transmitted as uint64s holding the bits
// of the underlying representation. They are sent byte-reversed, with
// the exponent end coming out first, so integer floating point numbers
// (for example) transmit more compactly. This routine does the
// unswizzling.
func floatFromBits(u uint64) float64 {
var v uint64;
for i := 0; i < 8; i++ {
v <<= 8;
v |= u & 0xFF;
u >>= 8;
}
return math.Float64frombits(v);
}
func decFloat(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := float(floatFromBits(uint64(DecodeUint(state))));
if state.err == nil {
*(*float)(p) = v;
}
}
func decFloat32(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := float32(floatFromBits(uint64(DecodeUint(state))));
if state.err == nil {
*(*float32)(p) = v;
}
}
func decFloat64(i *decInstr, state *DecState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if i.indir > 1 {
p = decIndirect(p, i.indir);
}
if *(*unsafe.Pointer)(p) == nil {
*(*unsafe.Pointer)(p) = unsafe.Pointer(new(int));
p = *(*unsafe.Pointer)(p);
}
}
v := floatFromBits(uint64(DecodeUint(state)));
if state.err == nil {
*(*float64)(p) = v;
}
}
src/pkg/gob/encode.go
View file @ b9689433
......@@ -67,11 +67,20 @@ type encInstr struct {
// Otherwise, the output (for a scalar) is the field number, as an encoded integer,
// followed by the field data in its appropriate format.
func encBool(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
func encIndirect(p unsafe.Pointer, indir int) unsafe.Pointer {
for ; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
return unsafe.Pointer(nil)
}
}
return p
}
func encBool(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -84,9 +93,8 @@ func encBool(i *encInstr, state *EncState) {
func encInt(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -99,9 +107,8 @@ func encInt(i *encInstr, state *EncState) {
func encUint(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -114,9 +121,8 @@ func encUint(i *encInstr, state *EncState) {
func encInt8(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -129,9 +135,8 @@ func encInt8(i *encInstr, state *EncState) {
func encUint8(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -144,9 +149,8 @@ func encUint8(i *encInstr, state *EncState) {
func encInt16(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -159,9 +163,8 @@ func encInt16(i *encInstr, state *EncState) {
func encUint16(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -174,9 +177,8 @@ func encUint16(i *encInstr, state *EncState) {
func encInt32(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -189,9 +191,8 @@ func encInt32(i *encInstr, state *EncState) {
func encUint32(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -204,9 +205,8 @@ func encUint32(i *encInstr, state *EncState) {
func encInt64(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -219,9 +219,8 @@ func encInt64(i *encInstr, state *EncState) {
func encUint64(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -250,9 +249,8 @@ func floatBits(f float64) uint64 {
func encFloat(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -266,9 +264,8 @@ func encFloat(i *encInstr, state *EncState) {
func encFloat32(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......@@ -282,9 +279,8 @@ func encFloat32(i *encInstr, state *EncState) {
func encFloat64(i *encInstr, state *EncState) {
p := unsafe.Pointer(state.base+i.offset);
for indir := i.indir; indir > 0; indir-- {
p = *(*unsafe.Pointer)(p);
if p == nil {
if i.indir > 0 {
if p = encIndirect(p, i.indir); p == nil {
return
}
}
......
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