mirror of
https://github.com/golang/go.git
synced 2024-10-01 15:27:13 +00:00
scalar decoders
R=rsc DELTA=897 (728 added, 14 deleted, 155 changed) OCL=30955 CL=30955
This commit is contained in:
Rob Pike
parent
79b2cf92d9
commit
b968943332
@ -11,6 +11,7 @@ import (
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"testing";
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"unsafe";
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)
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import "fmt" // TODO DELETE
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// Guarantee encoding format by comparing some encodings to hand-written values
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type EncodeT struct {
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@ -117,7 +118,7 @@ var floatResult = []byte{0x80, 0x40, 0xe2, 0x81, 0x40, 0xe2, 0x82, 0x40, 0xe2}
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// Do not run the machine yet; instead do individual instructions crafted by hand.
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func TestScalarEncInstructions(t *testing.T) {
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var b = new(bytes.Buffer);
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var state EncState;
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state := new(EncState);
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// bool
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{
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@ -129,15 +130,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encBool, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(boolResult, b.Data()) {
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t.Errorf("bool enc instructions: expected % x got % x", boolResult, b.Data())
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}
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@ -153,15 +154,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encInt, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -177,15 +178,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encUint, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -201,15 +202,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encInt, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int8 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -225,15 +226,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encUint, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint8 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -249,15 +250,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encInt16, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int16 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -273,15 +274,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encUint16, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint16 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -297,15 +298,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encInt32, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int32 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -321,15 +322,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encUint32, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint32 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -345,15 +346,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encInt64, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int64 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -369,15 +370,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encUint, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint64 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -393,15 +394,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encFloat, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float enc instructions: expected % x got % x", floatResult, b.Data())
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}
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@ -417,15 +418,15 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encFloat32, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float32 enc instructions: expected % x got % x", floatResult, b.Data())
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}
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@ -441,17 +442,453 @@ func TestScalarEncInstructions(t *testing.T) {
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instr := &encInstr{ encFloat64, 0, 0, 0 };
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state.w = b;
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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instr.op(instr, &state);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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instr.op(instr, &state);
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instr.op(instr, state);
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float64 enc instructions: expected % x got % x", floatResult, b.Data())
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}
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}
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}
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func expectField(n int, state *DecState, t *testing.T) {
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v := int(DecodeUint(state));
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if state.err != nil {
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t.Fatalf("decoding field number %d: %v", n, state.err);
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}
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if v != n {
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t.Fatalf("decoding field number %d, got %d", n, v);
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}
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}
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// Test instruction execution for decoding.
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// Do not run the machine yet; instead do individual instructions crafted by hand.
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func TestScalarDecInstructions(t *testing.T) {
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state := new(DecState);
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// bool
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{
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b := bytes.NewBuffer(boolResult);
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var data struct { a bool; b *bool; c **bool };
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instr := &decInstr{ decBool, 0, 0, 0 };
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state.r = b;
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state.base = uintptr(unsafe.Pointer(&data));
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expectField(0, state, t);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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expectField(1, state, t);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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expectField(2, state, t);
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instr.op(instr, state);
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if data.a != true {
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t.Errorf("int a = %v not true", data.a)
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}
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if *data.b != true {
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t.Errorf("int b = %v not true", *data.b)
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}
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if **data.c != true {
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t.Errorf("int c = %v not true", **data.c)
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}
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}
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// int
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{
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b := bytes.NewBuffer(signedResult);
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var data struct { a int; b *int; c **int };
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instr := &decInstr{ decInt, 0, 0, 0 };
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state.r = b;
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state.base = uintptr(unsafe.Pointer(&data));
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expectField(0, state, t);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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expectField(1, state, t);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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expectField(2, state, t);
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instr.op(instr, state);
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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if *data.b != 17 {
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t.Errorf("int b = %v not 17", *data.b)
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}
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if **data.c != 17 {
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t.Errorf("int c = %v not 17", **data.c)
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}
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}
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// uint
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{
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b := bytes.NewBuffer(unsignedResult);
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var data struct { a uint; b *uint; c **uint };
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instr := &decInstr{ decUint, 0, 0, 0 };
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state.r = b;
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state.base = uintptr(unsafe.Pointer(&data));
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expectField(0, state, t);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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expectField(1, state, t);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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expectField(2, state, t);
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instr.op(instr, state);
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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if *data.b != 17 {
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t.Errorf("int b = %v not 17", *data.b)
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}
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if **data.c != 17 {
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t.Errorf("int c = %v not 17", **data.c)
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}
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}
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// int8
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{
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b := bytes.NewBuffer(signedResult);
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var data struct { a int8; b *int8; c **int8 };
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instr := &decInstr{ decInt8, 0, 0, 0 };
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state.r = b;
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state.base = uintptr(unsafe.Pointer(&data));
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expectField(0, state, t);
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instr.op(instr, state);
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instr.field = 1;
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instr.indir = 1;
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instr.offset = uintptr(unsafe.Offsetof(data.b));
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expectField(1, state, t);
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instr.op(instr, state);
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instr.field = 2;
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instr.indir = 2;
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instr.offset = uintptr(unsafe.Offsetof(data.c));
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expectField(2, state, t);
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instr.op(instr, state);
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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if *data.b != 17 {
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t.Errorf("int b = %v not 17", *data.b)
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}
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if **data.c != 17 {
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t.Errorf("int c = %v not 17", **data.c)
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}
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}
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// uint8
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{
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b := bytes.NewBuffer(unsignedResult);
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var data struct { a uint8; b *uint8; c **uint8 };
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instr := &decInstr{ decUint8, 0, 0, 0 };
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state.r = b;
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state.base = uintptr(unsafe.Pointer(&data));
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expectField(0, state, t);
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instr.op(instr, state);
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instr.field = 1;
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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)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -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;
|
||||
}
|
||||
}
|
||||
|
||||
@ -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
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user