WIP Factor out instruction parsing
This commit is contained in:
lash
parent
31e011d531
commit
8c287b909b
GPG Key ID:
21D2E7BB88C2A746
@ -1,10 +1,9 @@
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package vm
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import (
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"encoding/binary"
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)
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const VERSION = 0
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type Opcode uint16
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// VM Opcodes
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const (
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BACK = 0
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@ -18,21 +17,3 @@ const (
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INCMP = 8
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_MAX = 8
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)
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// NewLine creates a new instruction line for the VM.
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func NewLine(instructionList []byte, instruction uint16, strargs []string, byteargs []byte, numargs []uint8) []byte {
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b := []byte{0x00, 0x00}
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binary.BigEndian.PutUint16(b, instruction)
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for _, arg := range strargs {
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b = append(b, uint8(len(arg)))
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b = append(b, []byte(arg)...)
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}
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if byteargs != nil {
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b = append(b, uint8(len(byteargs)))
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b = append(b, byteargs...)
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}
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if numargs != nil {
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b = append(b, numargs...)
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}
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return append(instructionList, b...)
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}
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205
go/vm/runner.go
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205
go/vm/runner.go
Normal file
@ -0,0 +1,205 @@
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package vm
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import (
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"encoding/binary"
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"context"
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"fmt"
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"log"
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"git.defalsify.org/festive/resource"
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"git.defalsify.org/festive/state"
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)
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//type Runner func(instruction []byte, st state.State, rs resource.Resource, ctx context.Context) (state.State, []byte, error)
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// Run extracts individual op codes and arguments and executes them.
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//
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// Each step may update the state.
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//
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// On error, the remaining instructions will be returned. State will not be rolled back.
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func Run(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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var err error
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for len(instruction) > 0 {
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log.Printf("instruction is now 0x%x", instruction)
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op := binary.BigEndian.Uint16(instruction[:2])
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if op > _MAX {
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return instruction, fmt.Errorf("opcode value %v out of range (%v)", op, _MAX)
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}
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switch op {
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case CATCH:
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instruction, err = RunCatch(instruction[2:], st, rs, ctx)
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case CROAK:
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instruction, err = RunCroak(instruction[2:], st, rs, ctx)
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case LOAD:
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instruction, err = RunLoad(instruction[2:], st, rs, ctx)
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case RELOAD:
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instruction, err = RunReload(instruction[2:], st, rs, ctx)
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case MAP:
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instruction, err = RunMap(instruction[2:], st, rs, ctx)
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case MOVE:
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instruction, err = RunMove(instruction[2:], st, rs, ctx)
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case BACK:
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instruction, err = RunBack(instruction[2:], st, rs, ctx)
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case INCMP:
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instruction, err = RunIncmp(instruction[2:], st, rs, ctx)
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case HALT:
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return RunHalt(instruction[2:], st, rs, ctx)
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default:
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err = fmt.Errorf("Unhandled state: %v", op)
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}
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if err != nil {
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return instruction, err
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}
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}
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return instruction, nil
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}
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// RunMap executes the MAP opcode
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func RunMap(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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err = st.Map(head)
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return tail, err
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}
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// RunMap executes the CATCH opcode
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func RunCatch(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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bitFieldSize := tail[0]
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bitField := tail[1:1+bitFieldSize]
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tail = tail[1+bitFieldSize:]
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matchMode := tail[0] // matchmode 1 is match NOT set bit
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tail = tail[1:]
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match := false
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if matchMode > 0 {
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if !st.GetIndex(bitField) {
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match = true
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}
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} else if st.GetIndex(bitField) {
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match = true
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}
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if match {
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log.Printf("catch at flag %v, moving to %v", bitField, head)
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st.Down(head)
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tail = []byte{}
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}
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return tail, nil
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}
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// RunMap executes the CROAK opcode
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func RunCroak(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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_ = head
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_ = tail
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st.Reset()
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return []byte{}, nil
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}
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// RunLoad executes the LOAD opcode
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func RunLoad(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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if !st.Check(head) {
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return instruction, fmt.Errorf("key %v already loaded", head)
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}
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sz := uint16(tail[0])
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tail = tail[1:]
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r, err := refresh(head, rs, ctx)
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if err != nil {
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return tail, err
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}
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err = st.Add(head, r, sz)
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return tail, err
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}
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// RunLoad executes the RELOAD opcode
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func RunReload(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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r, err := refresh(head, rs, ctx)
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if err != nil {
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return tail, err
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}
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st.Update(head, r)
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return tail, nil
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}
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// RunLoad executes the MOVE opcode
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func RunMove(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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st.Down(head)
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return tail, nil
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}
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// RunLoad executes the BACK opcode
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func RunBack(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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st.Up()
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return instruction, nil
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}
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// RunIncmp executes the INCMP opcode
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func RunIncmp(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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head, tail, err := instructionSplit(instruction)
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if err != nil {
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return instruction, err
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}
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sym, tail, err := instructionSplit(tail)
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if err != nil {
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return instruction, err
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}
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v, err := st.GetFlag(state.FLAG_INMATCH)
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if err != nil {
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return tail, err
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}
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if v {
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return tail, nil
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}
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input, err := st.GetInput()
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if err != nil {
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return tail, err
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}
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log.Printf("checking input %v %v", input, head)
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if head == string(input) {
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log.Printf("input match for '%s'", input)
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_, err = st.SetFlag(state.FLAG_INMATCH)
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st.Down(sym)
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}
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return tail, err
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}
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// RunHalt executes the HALT opcode
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func RunHalt(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
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log.Printf("found HALT, stopping")
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_, err := st.ResetFlag(state.FLAG_INMATCH)
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return instruction, err
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}
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// retrieve data for key
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func refresh(key string, rs resource.Resource, ctx context.Context) (string, error) {
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fn, err := rs.FuncFor(key)
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if err != nil {
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return "", err
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}
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if fn == nil {
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return "", fmt.Errorf("no retrieve function for external symbol %v", key)
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}
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return fn(ctx)
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}
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284
go/vm/runner_test.go
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284
go/vm/runner_test.go
Normal file
@ -0,0 +1,284 @@
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package vm
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import (
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"bytes"
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"context"
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"fmt"
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"log"
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"testing"
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"git.defalsify.org/festive/resource"
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"git.defalsify.org/festive/state"
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)
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var dynVal = "three"
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type TestResource struct {
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state *state.State
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}
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func getOne(ctx context.Context) (string, error) {
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return "one", nil
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}
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func getTwo(ctx context.Context) (string, error) {
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return "two", nil
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}
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func getDyn(ctx context.Context) (string, error) {
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return dynVal, nil
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}
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type TestStatefulResolver struct {
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state *state.State
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}
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func (r *TestResource) GetTemplate(sym string) (string, error) {
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switch sym {
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case "foo":
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return "inky pinky blinky clyde", nil
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case "bar":
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return "inky pinky {{.one}} blinky {{.two}} clyde", nil
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case "baz":
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return "inky pinky {{.baz}} blinky clyde", nil
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case "three":
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return "{{.one}} inky pinky {{.three}} blinky clyde {{.two}}", nil
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case "_catch":
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return "aiee", nil
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}
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panic(fmt.Sprintf("unknown symbol %s", sym))
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return "", fmt.Errorf("unknown symbol %s", sym)
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}
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func (r *TestResource) RenderTemplate(sym string, values map[string]string) (string, error) {
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return resource.DefaultRenderTemplate(r, sym, values)
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}
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func (r *TestResource) FuncFor(sym string) (resource.EntryFunc, error) {
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switch sym {
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case "one":
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return getOne, nil
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case "two":
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return getTwo, nil
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case "dyn":
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return getDyn, nil
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case "arg":
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return r.getInput, nil
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}
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return nil, fmt.Errorf("invalid function: '%s'", sym)
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}
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func(r *TestResource) getInput(ctx context.Context) (string, error) {
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v, err := r.state.GetInput()
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return string(v), err
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}
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func(r *TestResource) GetCode(sym string) ([]byte, error) {
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return []byte{}, nil
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}
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func TestRun(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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b := []byte{0x00, MOVE, 0x03}
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b = append(b, []byte("foo")...)
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_, err := Run(b, &st, &rs, context.TODO())
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if err != nil {
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t.Errorf("error on valid opcode: %v", err)
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}
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b = []byte{0x01, 0x02}
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_, err = Run(b, &st, &rs, context.TODO())
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if err == nil {
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t.Errorf("no error on invalid opcode")
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}
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}
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func TestRunLoadRender(t *testing.T) {
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st := state.NewState(5)
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st.Down("barbarbar")
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rs := TestResource{}
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sym := "one"
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ins := append([]byte{uint8(len(sym))}, []byte(sym)...)
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ins = append(ins, 0x0a)
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var err error
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_, err = RunLoad(ins, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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m, err := st.Get()
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if err != nil {
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t.Error(err)
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}
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r, err := rs.RenderTemplate("foo", m)
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if err != nil {
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t.Error(err)
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}
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expect := "inky pinky blinky clyde"
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if r != expect {
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t.Errorf("Expected %v, got %v", []byte(expect), []byte(r))
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}
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r, err = rs.RenderTemplate("bar", m)
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if err == nil {
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t.Errorf("expected error for render of bar: %v" ,err)
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}
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sym = "two"
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ins = append([]byte{uint8(len(sym))}, []byte(sym)...)
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ins = append(ins, 0)
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_, err = RunLoad(ins, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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m, err = st.Get()
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if err != nil {
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t.Error(err)
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}
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r, err = rs.RenderTemplate("bar", m)
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if err != nil {
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t.Error(err)
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}
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expect = "inky pinky one blinky two clyde"
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if r != expect {
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t.Errorf("Expected %v, got %v", expect, r)
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}
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}
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func TestRunMultiple(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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b := []byte{}
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b = NewLine(b, LOAD, []string{"one"}, nil, []uint8{0})
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b = NewLine(b, LOAD, []string{"two"}, nil, []uint8{42})
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_, err := Run(b, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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}
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func TestRunReload(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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b := []byte{}
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b = NewLine(b, LOAD, []string{"dyn"}, nil, []uint8{0})
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b = NewLine(b, MAP, []string{"dyn"}, nil, nil)
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_, err := Run(b, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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r, err := st.Val("dyn")
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if err != nil {
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t.Error(err)
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}
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if r != "three" {
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t.Errorf("expected result 'three', got %v", r)
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}
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dynVal = "baz"
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b = []byte{}
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b = NewLine(b, RELOAD, []string{"dyn"}, nil, nil)
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_, err = Run(b, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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r, err = st.Val("dyn")
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if err != nil {
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t.Error(err)
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}
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log.Printf("dun now %s", r)
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if r != "baz" {
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t.Errorf("expected result 'baz', got %v", r)
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}
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}
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func TestHalt(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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b := NewLine([]byte{}, LOAD, []string{"one"}, nil, []uint8{0})
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b = NewLine(b, HALT, nil, nil, nil)
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b = NewLine(b, MOVE, []string{"foo"}, nil, nil)
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var err error
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b, err = Run(b, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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r := st.Where()
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if r == "foo" {
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t.Fatalf("Expected where-symbol not to be 'foo'")
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}
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if !bytes.Equal(b[:2], []byte{0x00, MOVE}) {
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t.Fatalf("Expected MOVE instruction, found '%v'", b)
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}
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}
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func TestRunArg(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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input := []byte("bar")
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_ = st.SetInput(input)
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bi := NewLine([]byte{}, INCMP, []string{"bar", "baz"}, nil, nil)
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b, err := Run(bi, &st, &rs, context.TODO())
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if err != nil {
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t.Error(err)
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}
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l := len(b)
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if l != 0 {
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t.Errorf("expected empty remainder, got length %v: %v", l, b)
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}
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r := st.Where()
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if r != "baz" {
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t.Errorf("expected where-state baz, got %v", r)
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}
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}
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func TestRunInputHandler(t *testing.T) {
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st := state.NewState(5)
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rs := TestResource{}
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_ = st.SetInput([]byte("baz"))
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bi := NewLine([]byte{}, INCMP, []string{"bar", "aiee"}, nil, nil)
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bi = NewLine(bi, INCMP, []string{"baz", "foo"}, nil, nil)
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bi = NewLine(bi, LOAD, []string{"one"}, nil, []uint8{0})
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bi = NewLine(bi, LOAD, []string{"two"}, nil, []uint8{3})
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bi = NewLine(bi, MAP, []string{"one"}, nil, nil)
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bi = NewLine(bi, MAP, []string{"two"}, nil, nil)
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var err error
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_, err = Run(bi, &st, &rs, context.TODO())
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if err != nil {
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t.Fatal(err)
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}
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r := st.Where()
|
||||
if r != "foo" {
|
||||
t.Fatalf("expected where-sym 'foo', got '%v'", r)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunArgInvalid(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
|
||||
_ = st.SetInput([]byte("foo"))
|
||||
|
||||
var err error
|
||||
|
||||
b := NewLine([]byte{}, INCMP, []string{"bar", "baz"}, nil, nil)
|
||||
b = NewLine(b, CATCH, []string{"_catch"}, []byte{state.FLAG_INMATCH}, []uint8{1})
|
||||
|
||||
b, err = Run(b, &st, &rs, context.TODO())
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
l := len(b)
|
||||
if l != 0 {
|
||||
t.Errorf("expected empty remainder, got length %v: %v", l, b)
|
||||
}
|
||||
r := st.Where()
|
||||
if r != "_catch" {
|
||||
t.Errorf("expected where-state _catch, got %v", r)
|
||||
}
|
||||
}
|
||||
339
go/vm/vm.go
339
go/vm/vm.go
@ -2,215 +2,147 @@ package vm
|
||||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"context"
|
||||
"fmt"
|
||||
"log"
|
||||
|
||||
"git.defalsify.org/festive/resource"
|
||||
"git.defalsify.org/festive/state"
|
||||
)
|
||||
|
||||
//type Runner func(instruction []byte, st state.State, rs resource.Resource, ctx context.Context) (state.State, []byte, error)
|
||||
|
||||
func argFromBytes(input []byte) (string, []byte, error) {
|
||||
if len(input) == 0 {
|
||||
return "", input, fmt.Errorf("zero length input")
|
||||
}
|
||||
sz := input[0]
|
||||
out := input[1:1+sz]
|
||||
return string(out), input[1+sz:], nil
|
||||
func ParseLoad(b []byte) (string, uint32, []byte, error) {
|
||||
return parseSymLen(b, LOAD)
|
||||
}
|
||||
|
||||
// Run extracts individual op codes and arguments and executes them.
|
||||
//
|
||||
// Each step may update the state.
|
||||
//
|
||||
// On error, the remaining instructions will be returned. State will not be rolled back.
|
||||
func Run(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
var err error
|
||||
for len(instruction) > 0 {
|
||||
log.Printf("instruction is now 0x%x", instruction)
|
||||
op := binary.BigEndian.Uint16(instruction[:2])
|
||||
if op > _MAX {
|
||||
return instruction, fmt.Errorf("opcode value %v out of range (%v)", op, _MAX)
|
||||
}
|
||||
switch op {
|
||||
case CATCH:
|
||||
instruction, err = RunCatch(instruction[2:], st, rs, ctx)
|
||||
case CROAK:
|
||||
instruction, err = RunCroak(instruction[2:], st, rs, ctx)
|
||||
case LOAD:
|
||||
instruction, err = RunLoad(instruction[2:], st, rs, ctx)
|
||||
case RELOAD:
|
||||
instruction, err = RunReload(instruction[2:], st, rs, ctx)
|
||||
case MAP:
|
||||
instruction, err = RunMap(instruction[2:], st, rs, ctx)
|
||||
case MOVE:
|
||||
instruction, err = RunMove(instruction[2:], st, rs, ctx)
|
||||
case BACK:
|
||||
instruction, err = RunBack(instruction[2:], st, rs, ctx)
|
||||
case INCMP:
|
||||
instruction, err = RunIncmp(instruction[2:], st, rs, ctx)
|
||||
case HALT:
|
||||
return RunHalt(instruction[2:], st, rs, ctx)
|
||||
default:
|
||||
err = fmt.Errorf("Unhandled state: %v", op)
|
||||
}
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
}
|
||||
return instruction, nil
|
||||
func ParseReload(b []byte) (string, []byte, error) {
|
||||
return parseSym(b, RELOAD)
|
||||
}
|
||||
|
||||
// RunMap executes the MAP opcode
|
||||
func RunMap(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
func ParseMap(b []byte) (string, []byte, error) {
|
||||
return parseSym(b, MAP)
|
||||
}
|
||||
|
||||
func ParseMove(b []byte) (string, []byte, error) {
|
||||
return parseSym(b, MOVE)
|
||||
}
|
||||
|
||||
func ParseHalt(b []byte) ([]byte, error) {
|
||||
return parseNoArg(b, HALT)
|
||||
}
|
||||
|
||||
func ParseCatch(b []byte) (string, uint8, []byte, error) {
|
||||
return parseSymSig(b, CATCH)
|
||||
}
|
||||
|
||||
func ParseCroak(b []byte) (string, uint8, []byte, error) {
|
||||
return parseSymSig(b, CROAK)
|
||||
}
|
||||
|
||||
func ParseInCmp(b []byte) (string, string, []byte, error) {
|
||||
return parseTwoSym(b, INCMP)
|
||||
}
|
||||
|
||||
func parseNoArg(b []byte, op Opcode) ([]byte, error) {
|
||||
return opCheck(b, op)
|
||||
}
|
||||
|
||||
func parseSym(b []byte, op Opcode) (string, []byte, error) {
|
||||
b, err := opCheck(b, op)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
return "", b, err
|
||||
}
|
||||
err = st.Map(head)
|
||||
return tail, err
|
||||
sym, tail, err := instructionSplit(b)
|
||||
if err != nil {
|
||||
return "", b, err
|
||||
}
|
||||
return sym, tail, nil
|
||||
}
|
||||
|
||||
// RunMap executes the CATCH opcode
|
||||
func RunCatch(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
func parseTwoSym(b []byte, op Opcode) (string, string, []byte, error) {
|
||||
b, err := opCheck(b, op)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
return "", "", b, err
|
||||
}
|
||||
bitFieldSize := tail[0]
|
||||
bitField := tail[1:1+bitFieldSize]
|
||||
tail = tail[1+bitFieldSize:]
|
||||
matchMode := tail[0] // matchmode 1 is match NOT set bit
|
||||
symOne, tail, err := instructionSplit(b)
|
||||
if err != nil {
|
||||
return "", "", b, err
|
||||
}
|
||||
symTwo, tail, err := instructionSplit(tail)
|
||||
if err != nil {
|
||||
return "", "", tail, err
|
||||
}
|
||||
return symOne, symTwo, tail, nil
|
||||
}
|
||||
|
||||
func parseSymLen(b []byte, op Opcode) (string, uint32, []byte, error) {
|
||||
b, err := opCheck(b, op)
|
||||
if err != nil {
|
||||
return "", 0, b, err
|
||||
}
|
||||
sym, tail, err := instructionSplit(b)
|
||||
if err != nil {
|
||||
return "", 0, b, err
|
||||
}
|
||||
sz, tail, err := intSplit(tail)
|
||||
if err != nil {
|
||||
return "", 0, b, err
|
||||
}
|
||||
return sym, sz, tail, nil
|
||||
}
|
||||
|
||||
func parseSymSig(b []byte, op Opcode) (string, uint8, []byte, error) {
|
||||
b, err := opCheck(b, op)
|
||||
if err != nil {
|
||||
return "", 0, b, err
|
||||
}
|
||||
sym, tail, err := instructionSplit(b)
|
||||
if err != nil {
|
||||
return "", 0, b, err
|
||||
}
|
||||
if len(tail) == 0 {
|
||||
return "", 0, b, fmt.Errorf("instruction too short")
|
||||
}
|
||||
n := tail[0]
|
||||
tail = tail[1:]
|
||||
match := false
|
||||
if matchMode > 0 {
|
||||
if !st.GetIndex(bitField) {
|
||||
match = true
|
||||
return sym, n, tail, nil
|
||||
}
|
||||
|
||||
// NewLine creates a new instruction line for the VM.
|
||||
func NewLine(instructionList []byte, instruction uint16, strargs []string, byteargs []byte, numargs []uint8) []byte {
|
||||
if instructionList == nil {
|
||||
instructionList = []byte{}
|
||||
}
|
||||
b := []byte{0x00, 0x00}
|
||||
binary.BigEndian.PutUint16(b, instruction)
|
||||
for _, arg := range strargs {
|
||||
b = append(b, uint8(len(arg)))
|
||||
b = append(b, []byte(arg)...)
|
||||
}
|
||||
if byteargs != nil {
|
||||
b = append(b, uint8(len(byteargs)))
|
||||
b = append(b, byteargs...)
|
||||
}
|
||||
if numargs != nil {
|
||||
b = append(b, numargs...)
|
||||
}
|
||||
return append(instructionList, b...)
|
||||
}
|
||||
|
||||
func intSplit(b []byte) (uint32, []byte, error) {
|
||||
l := uint8(b[0])
|
||||
sz := uint32(l)
|
||||
b = b[1:]
|
||||
if l > 0 {
|
||||
r := []byte{0, 0, 0, 0}
|
||||
c := 0
|
||||
ll := 4 - l
|
||||
var i uint8
|
||||
for i = 0; i < 4; i++ {
|
||||
if i >= ll {
|
||||
r[i] = b[c]
|
||||
c += 1
|
||||
}
|
||||
}
|
||||
} else if st.GetIndex(bitField) {
|
||||
match = true
|
||||
sz = binary.BigEndian.Uint32(r)
|
||||
b = b[l:]
|
||||
}
|
||||
|
||||
if match {
|
||||
log.Printf("catch at flag %v, moving to %v", bitField, head)
|
||||
st.Down(head)
|
||||
tail = []byte{}
|
||||
}
|
||||
return tail, nil
|
||||
}
|
||||
|
||||
// RunMap executes the CROAK opcode
|
||||
func RunCroak(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
_ = head
|
||||
_ = tail
|
||||
st.Reset()
|
||||
return []byte{}, nil
|
||||
}
|
||||
|
||||
// RunLoad executes the LOAD opcode
|
||||
func RunLoad(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
if !st.Check(head) {
|
||||
return instruction, fmt.Errorf("key %v already loaded", head)
|
||||
}
|
||||
sz := uint16(tail[0])
|
||||
tail = tail[1:]
|
||||
|
||||
r, err := refresh(head, rs, ctx)
|
||||
if err != nil {
|
||||
return tail, err
|
||||
}
|
||||
err = st.Add(head, r, sz)
|
||||
return tail, err
|
||||
}
|
||||
|
||||
// RunLoad executes the RELOAD opcode
|
||||
func RunReload(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
r, err := refresh(head, rs, ctx)
|
||||
if err != nil {
|
||||
return tail, err
|
||||
}
|
||||
st.Update(head, r)
|
||||
return tail, nil
|
||||
}
|
||||
|
||||
// RunLoad executes the MOVE opcode
|
||||
func RunMove(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
st.Down(head)
|
||||
return tail, nil
|
||||
}
|
||||
|
||||
// RunLoad executes the BACK opcode
|
||||
func RunBack(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
st.Up()
|
||||
return instruction, nil
|
||||
}
|
||||
|
||||
// RunIncmp executes the INCMP opcode
|
||||
func RunIncmp(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
head, tail, err := instructionSplit(instruction)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
sym, tail, err := instructionSplit(tail)
|
||||
if err != nil {
|
||||
return instruction, err
|
||||
}
|
||||
v, err := st.GetFlag(state.FLAG_INMATCH)
|
||||
if err != nil {
|
||||
return tail, err
|
||||
}
|
||||
if v {
|
||||
return tail, nil
|
||||
}
|
||||
input, err := st.GetInput()
|
||||
if err != nil {
|
||||
return tail, err
|
||||
}
|
||||
log.Printf("checking input %v %v", input, head)
|
||||
if head == string(input) {
|
||||
log.Printf("input match for '%s'", input)
|
||||
_, err = st.SetFlag(state.FLAG_INMATCH)
|
||||
st.Down(sym)
|
||||
}
|
||||
return tail, err
|
||||
}
|
||||
|
||||
// RunHalt executes the HALT opcode
|
||||
func RunHalt(instruction []byte, st *state.State, rs resource.Resource, ctx context.Context) ([]byte, error) {
|
||||
log.Printf("found HALT, stopping")
|
||||
_, err := st.ResetFlag(state.FLAG_INMATCH)
|
||||
return instruction, err
|
||||
}
|
||||
|
||||
|
||||
// retrieve data for key
|
||||
func refresh(key string, rs resource.Resource, ctx context.Context) (string, error) {
|
||||
fn, err := rs.FuncFor(key)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
if fn == nil {
|
||||
return "", fmt.Errorf("no retrieve function for external symbol %v", key)
|
||||
}
|
||||
return fn(ctx)
|
||||
return sz, b, nil
|
||||
}
|
||||
|
||||
// split instruction into symbol and arguments
|
||||
@ -229,3 +161,26 @@ func instructionSplit(b []byte) (string, []byte, error) {
|
||||
r := string(b[1:1+sz])
|
||||
return r, b[1+sz:], nil
|
||||
}
|
||||
|
||||
func opCheck(b []byte, opIn Opcode) ([]byte, error) {
|
||||
op, b, err := opSplit(b)
|
||||
if err != nil {
|
||||
return b, err
|
||||
}
|
||||
if op != opIn {
|
||||
return b, fmt.Errorf("not a %v instruction", op)
|
||||
}
|
||||
return b, nil
|
||||
}
|
||||
|
||||
func opSplit(b []byte) (Opcode, []byte, error) {
|
||||
l := len(b)
|
||||
if l < 2 {
|
||||
return 0, b, fmt.Errorf("input size %v too short for opcode", l)
|
||||
}
|
||||
op := binary.BigEndian.Uint16(b)
|
||||
if op > _MAX {
|
||||
return 0, b, fmt.Errorf("invalid opcode %v", op)
|
||||
}
|
||||
return Opcode(op), b[2:], nil
|
||||
}
|
||||
|
||||
320
go/vm/vm_test.go
320
go/vm/vm_test.go
@ -1,284 +1,108 @@
|
||||
package vm
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"fmt"
|
||||
"log"
|
||||
"testing"
|
||||
|
||||
"git.defalsify.org/festive/resource"
|
||||
"git.defalsify.org/festive/state"
|
||||
)
|
||||
|
||||
var dynVal = "three"
|
||||
|
||||
type TestResource struct {
|
||||
state *state.State
|
||||
}
|
||||
|
||||
func getOne(ctx context.Context) (string, error) {
|
||||
return "one", nil
|
||||
}
|
||||
|
||||
func getTwo(ctx context.Context) (string, error) {
|
||||
return "two", nil
|
||||
}
|
||||
|
||||
func getDyn(ctx context.Context) (string, error) {
|
||||
return dynVal, nil
|
||||
}
|
||||
|
||||
type TestStatefulResolver struct {
|
||||
state *state.State
|
||||
}
|
||||
|
||||
func (r *TestResource) GetTemplate(sym string) (string, error) {
|
||||
switch sym {
|
||||
case "foo":
|
||||
return "inky pinky blinky clyde", nil
|
||||
case "bar":
|
||||
return "inky pinky {{.one}} blinky {{.two}} clyde", nil
|
||||
case "baz":
|
||||
return "inky pinky {{.baz}} blinky clyde", nil
|
||||
case "three":
|
||||
return "{{.one}} inky pinky {{.three}} blinky clyde {{.two}}", nil
|
||||
case "_catch":
|
||||
return "aiee", nil
|
||||
}
|
||||
panic(fmt.Sprintf("unknown symbol %s", sym))
|
||||
return "", fmt.Errorf("unknown symbol %s", sym)
|
||||
}
|
||||
|
||||
func (r *TestResource) RenderTemplate(sym string, values map[string]string) (string, error) {
|
||||
return resource.DefaultRenderTemplate(r, sym, values)
|
||||
}
|
||||
|
||||
func (r *TestResource) FuncFor(sym string) (resource.EntryFunc, error) {
|
||||
switch sym {
|
||||
case "one":
|
||||
return getOne, nil
|
||||
case "two":
|
||||
return getTwo, nil
|
||||
case "dyn":
|
||||
return getDyn, nil
|
||||
case "arg":
|
||||
return r.getInput, nil
|
||||
}
|
||||
return nil, fmt.Errorf("invalid function: '%s'", sym)
|
||||
}
|
||||
|
||||
func(r *TestResource) getInput(ctx context.Context) (string, error) {
|
||||
v, err := r.state.GetInput()
|
||||
return string(v), err
|
||||
}
|
||||
|
||||
func(r *TestResource) GetCode(sym string) ([]byte, error) {
|
||||
return []byte{}, nil
|
||||
}
|
||||
|
||||
func TestRun(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
b := []byte{0x00, MOVE, 0x03}
|
||||
b = append(b, []byte("foo")...)
|
||||
_, err := Run(b, &st, &rs, context.TODO())
|
||||
func TestParseNoArg(t *testing.T) {
|
||||
b := NewLine(nil, HALT, nil, nil, nil)
|
||||
b, err := ParseHalt(b)
|
||||
if err != nil {
|
||||
t.Errorf("error on valid opcode: %v", err)
|
||||
}
|
||||
|
||||
b = []byte{0x01, 0x02}
|
||||
_, err = Run(b, &st, &rs, context.TODO())
|
||||
if err == nil {
|
||||
t.Errorf("no error on invalid opcode")
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunLoadRender(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
st.Down("barbarbar")
|
||||
rs := TestResource{}
|
||||
sym := "one"
|
||||
ins := append([]byte{uint8(len(sym))}, []byte(sym)...)
|
||||
ins = append(ins, 0x0a)
|
||||
var err error
|
||||
_, err = RunLoad(ins, &st, &rs, context.TODO())
|
||||
func TestParseSym(t *testing.T) {
|
||||
b := NewLine(nil, MAP, []string{"baz"}, nil, nil)
|
||||
sym, b, err := ParseMap(b)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
t.Fatal(err)
|
||||
}
|
||||
m, err := st.Get()
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
r, err := rs.RenderTemplate("foo", m)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
expect := "inky pinky blinky clyde"
|
||||
if r != expect {
|
||||
t.Errorf("Expected %v, got %v", []byte(expect), []byte(r))
|
||||
if sym != "baz" {
|
||||
t.Fatalf("expected sym baz, got %v", sym)
|
||||
}
|
||||
|
||||
r, err = rs.RenderTemplate("bar", m)
|
||||
if err == nil {
|
||||
t.Errorf("expected error for render of bar: %v" ,err)
|
||||
b = NewLine(nil, RELOAD, []string{"xyzzy"}, nil, nil)
|
||||
sym, b, err = ParseReload(b)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if sym != "xyzzy" {
|
||||
t.Fatalf("expected sym xyzzy, got %v", sym)
|
||||
}
|
||||
|
||||
sym = "two"
|
||||
ins = append([]byte{uint8(len(sym))}, []byte(sym)...)
|
||||
ins = append(ins, 0)
|
||||
_, err = RunLoad(ins, &st, &rs, context.TODO())
|
||||
b = NewLine(nil, MOVE, []string{"plugh"}, nil, nil)
|
||||
sym, b, err = ParseMove(b)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
t.Fatal(err)
|
||||
}
|
||||
m, err = st.Get()
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
r, err = rs.RenderTemplate("bar", m)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
expect = "inky pinky one blinky two clyde"
|
||||
if r != expect {
|
||||
t.Errorf("Expected %v, got %v", expect, r)
|
||||
if sym != "plugh" {
|
||||
t.Fatalf("expected sym plugh, got %v", sym)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunMultiple(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
b := []byte{}
|
||||
b = NewLine(b, LOAD, []string{"one"}, nil, []uint8{0})
|
||||
b = NewLine(b, LOAD, []string{"two"}, nil, []uint8{42})
|
||||
_, err := Run(b, &st, &rs, context.TODO())
|
||||
func TestParseTwoSym(t *testing.T) {
|
||||
b := NewLine(nil, INCMP, []string{"foo", "bar"}, nil, nil)
|
||||
one, two, b, err := ParseInCmp(b)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
t.Fatal(err)
|
||||
}
|
||||
if one != "foo" {
|
||||
t.Fatalf("expected symone foo, got %v", one)
|
||||
}
|
||||
if two != "bar" {
|
||||
t.Fatalf("expected symtwo bar, got %v", two)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunReload(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
b := []byte{}
|
||||
b = NewLine(b, LOAD, []string{"dyn"}, nil, []uint8{0})
|
||||
b = NewLine(b, MAP, []string{"dyn"}, nil, nil)
|
||||
_, err := Run(b, &st, &rs, context.TODO())
|
||||
func TestParseSymSig(t *testing.T) {
|
||||
b := NewLine(nil, CATCH, []string{"baz"}, nil, []uint8{0x0d})
|
||||
sym, n, b, err := ParseCatch(b)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
t.Fatal(err)
|
||||
}
|
||||
r, err := st.Val("dyn")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
if sym != "baz" {
|
||||
t.Fatalf("expected sym baz, got %v", sym)
|
||||
}
|
||||
if r != "three" {
|
||||
t.Errorf("expected result 'three', got %v", r)
|
||||
}
|
||||
dynVal = "baz"
|
||||
b = []byte{}
|
||||
b = NewLine(b, RELOAD, []string{"dyn"}, nil, nil)
|
||||
_, err = Run(b, &st, &rs, context.TODO())
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
r, err = st.Val("dyn")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
log.Printf("dun now %s", r)
|
||||
if r != "baz" {
|
||||
t.Errorf("expected result 'baz', got %v", r)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestHalt(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
b := NewLine([]byte{}, LOAD, []string{"one"}, nil, []uint8{0})
|
||||
b = NewLine(b, HALT, nil, nil, nil)
|
||||
b = NewLine(b, MOVE, []string{"foo"}, nil, nil)
|
||||
var err error
|
||||
b, err = Run(b, &st, &rs, context.TODO())
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
r := st.Where()
|
||||
if r == "foo" {
|
||||
t.Fatalf("Expected where-symbol not to be 'foo'")
|
||||
}
|
||||
if !bytes.Equal(b[:2], []byte{0x00, MOVE}) {
|
||||
t.Fatalf("Expected MOVE instruction, found '%v'", b)
|
||||
if n != 13 {
|
||||
t.Fatalf("expected n 13, got %v", n)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunArg(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
|
||||
input := []byte("bar")
|
||||
_ = st.SetInput(input)
|
||||
|
||||
bi := NewLine([]byte{}, INCMP, []string{"bar", "baz"}, nil, nil)
|
||||
b, err := Run(bi, &st, &rs, context.TODO())
|
||||
func TestParseSymAndLen(t *testing.T) {
|
||||
b := NewLine(nil, LOAD, []string{"foo"}, []byte{0x2a}, nil)
|
||||
sym, n, b, err := ParseLoad(b)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
t.Fatal(err)
|
||||
}
|
||||
l := len(b)
|
||||
if l != 0 {
|
||||
t.Errorf("expected empty remainder, got length %v: %v", l, b)
|
||||
if sym != "foo" {
|
||||
t.Fatalf("expected sym foo, got %v", sym)
|
||||
}
|
||||
r := st.Where()
|
||||
if r != "baz" {
|
||||
t.Errorf("expected where-state baz, got %v", r)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunInputHandler(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
|
||||
_ = st.SetInput([]byte("baz"))
|
||||
|
||||
bi := NewLine([]byte{}, INCMP, []string{"bar", "aiee"}, nil, nil)
|
||||
bi = NewLine(bi, INCMP, []string{"baz", "foo"}, nil, nil)
|
||||
bi = NewLine(bi, LOAD, []string{"one"}, nil, []uint8{0})
|
||||
bi = NewLine(bi, LOAD, []string{"two"}, nil, []uint8{3})
|
||||
bi = NewLine(bi, MAP, []string{"one"}, nil, nil)
|
||||
bi = NewLine(bi, MAP, []string{"two"}, nil, nil)
|
||||
|
||||
var err error
|
||||
_, err = Run(bi, &st, &rs, context.TODO())
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
r := st.Where()
|
||||
if r != "foo" {
|
||||
t.Fatalf("expected where-sym 'foo', got '%v'", r)
|
||||
}
|
||||
}
|
||||
|
||||
func TestRunArgInvalid(t *testing.T) {
|
||||
st := state.NewState(5)
|
||||
rs := TestResource{}
|
||||
|
||||
_ = st.SetInput([]byte("foo"))
|
||||
|
||||
var err error
|
||||
|
||||
b := NewLine([]byte{}, INCMP, []string{"bar", "baz"}, nil, nil)
|
||||
b = NewLine(b, CATCH, []string{"_catch"}, []byte{state.FLAG_INMATCH}, []uint8{1})
|
||||
|
||||
b, err = Run(b, &st, &rs, context.TODO())
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
l := len(b)
|
||||
if l != 0 {
|
||||
t.Errorf("expected empty remainder, got length %v: %v", l, b)
|
||||
}
|
||||
r := st.Where()
|
||||
if r != "_catch" {
|
||||
t.Errorf("expected where-state _catch, got %v", r)
|
||||
if n != 42 {
|
||||
t.Fatalf("expected n 42, got %v", n)
|
||||
}
|
||||
|
||||
b = NewLine(nil, LOAD, []string{"bar"}, []byte{0x02, 0x9a}, nil)
|
||||
sym, n, b, err = ParseLoad(b)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if sym != "bar" {
|
||||
t.Fatalf("expected sym foo, got %v", sym)
|
||||
}
|
||||
if n != 666 {
|
||||
t.Fatalf("expected n 666, got %v", n)
|
||||
}
|
||||
|
||||
b = NewLine(nil, LOAD, []string{"baz"}, []byte{0x0}, nil)
|
||||
sym, n, b, err = ParseLoad(b)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if sym != "baz" {
|
||||
t.Fatalf("expected sym foo, got %v", sym)
|
||||
}
|
||||
if n != 0 {
|
||||
t.Fatalf("expected n 666, got %v", n)
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user