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program.go
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program.go
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package vm
import (
"encoding/binary"
"fmt"
"regexp"
"github.com/byte-power/jsexpr/file"
)
type Program struct {
Source *file.Source `msgpack:"source"`
Locations map[int]file.Location `msgpack:"locations"`
Constants []interface{} `msgpack:"constants"`
Bytecode []byte `msgpack:"bytecode"`
}
func (program *Program) Disassemble() string {
out := ""
ip := 0
for ip < len(program.Bytecode) {
pp := ip
op := program.Bytecode[ip]
ip++
readArg := func() uint16 {
if ip+1 >= len(program.Bytecode) {
return 0
}
i := binary.LittleEndian.Uint16([]byte{program.Bytecode[ip], program.Bytecode[ip+1]})
ip += 2
return i
}
code := func(label string) {
out += fmt.Sprintf("%v\t%v\n", pp, label)
}
jump := func(label string) {
a := readArg()
out += fmt.Sprintf("%v\t%v\t%v\t(%v)\n", pp, label, a, ip+int(a))
}
back := func(label string) {
a := readArg()
out += fmt.Sprintf("%v\t%v\t%v\t(%v)\n", pp, label, a, ip-int(a))
}
argument := func(label string) {
a := readArg()
out += fmt.Sprintf("%v\t%v\t%v\n", pp, label, a)
}
constant := func(label string) {
a := readArg()
var c interface{}
if int(a) < len(program.Constants) {
c = program.Constants[a]
}
if r, ok := c.(*regexp.Regexp); ok {
c = r.String()
}
out += fmt.Sprintf("%v\t%v\t%v\t%#v\n", pp, label, a, c)
}
switch op {
case OpPush:
constant("OpPush")
case OpPop:
code("OpPop")
case OpRot:
code("OpRot")
case OpFetch:
constant("OpFetch")
case OpFetchMap:
constant("OpFetchMap")
case OpTrue:
code("OpTrue")
case OpFalse:
code("OpFalse")
case OpNil:
code("OpNil")
case OpNegate:
code("OpNegate")
case OpNot:
code("OpNot")
case OpEqual:
code("OpEqual")
case OpEqualInt:
code("OpEqualInt")
case OpEqualString:
code("OpEqualString")
case OpJump:
jump("OpJump")
case OpJumpIfTrue:
jump("OpJumpIfTrue")
case OpJumpIfFalse:
jump("OpJumpIfFalse")
case OpJumpBackward:
back("OpJumpBackward")
case OpIn:
code("OpIn")
case OpLess:
code("OpLess")
case OpMore:
code("OpMore")
case OpLessOrEqual:
code("OpLessOrEqual")
case OpMoreOrEqual:
code("OpMoreOrEqual")
case OpAdd:
code("OpAdd")
case OpSubtract:
code("OpSubtract")
case OpMultiply:
code("OpMultiply")
case OpDivide:
code("OpDivide")
case OpModulo:
code("OpModulo")
case OpExponent:
code("OpExponent")
case OpRange:
code("OpRange")
case OpMatches:
code("OpMatches")
case OpMatchesConst:
constant("OpMatchesConst")
case OpContains:
code("OpContains")
case OpStartsWith:
code("OpStartsWith")
case OpEndsWith:
code("OpEndsWith")
case OpIndex:
code("OpIndex")
case OpSlice:
code("OpSlice")
case OpProperty:
constant("OpProperty")
case OpCall:
constant("OpCall")
case OpCallFast:
constant("OpCallFast")
case OpMethod:
constant("OpMethod")
case OpArray:
code("OpArray")
case OpMap:
code("OpMap")
case OpLen:
code("OpLen")
case OpCast:
argument("OpCast")
case OpStore:
constant("OpStore")
case OpLoad:
constant("OpLoad")
case OpInc:
constant("OpInc")
case OpBegin:
code("OpBegin")
case OpEnd:
code("OpEnd")
default:
out += fmt.Sprintf("%v\t%#x\n", pp, op)
}
}
return out
}