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package vm

import (

"bytes"

"fmt"

"io"

"reflect"

"regexp"

"strings"

"text/tabwriter"

"github.com/expr-lang/expr/builtin"

"github.com/expr-lang/expr/file"

"github.com/expr-lang/expr/vm/runtime"

)

// Program represents a compiled expression.

type Program struct {

Bytecode []Opcode

Arguments []int

Constants []any

source *file.Source

locations []file.Location

variables []any

functions []Function

debugInfo map[string]string

}

// NewProgram returns a new Program. It's used by the compiler.

func NewProgram(

source *file.Source,

locations []file.Location,

variables []any,

constants []any,

bytecode []Opcode,

arguments []int,

functions []Function,

debugInfo map[string]string,

) *Program {

return &Program{

source: source,

locations: locations,

variables: variables,

Constants: constants,

Bytecode: bytecode,

Arguments: arguments,

functions: functions,

debugInfo: debugInfo,

}

}

// Disassemble returns opcodes as a string.

func (program *Program) Disassemble() string {

var buf bytes.Buffer

w := tabwriter.NewWriter(&buf, 0, 0, 2, ' ', 0)

program.DisassembleWriter(w)

_ = w.Flush()

return buf.String()

}

// DisassembleWriter takes a writer and writes opcodes to it.

func (program *Program) DisassembleWriter(w io.Writer) {

ip := 0

for ip < len(program.Bytecode) {

pp := ip

op := program.Bytecode[ip]

arg := program.Arguments[ip]

ip += 1

code := func(label string) {

_, _ = fmt.Fprintf(w, "%v\t%v\n", pp, label)

}

jump := func(label string) {

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t(%v)\n", pp, label, arg, ip+arg)

}

jumpBack := func(label string) {

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t(%v)\n", pp, label, arg, ip-arg)

}

argument := func(label string) {

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\n", pp, label, arg)

}

argumentWithInfo := func(label string, prefix string) {

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t%v\n", pp, label, arg, program.debugInfo[fmt.Sprintf("%s_%d", prefix, arg)])

}

constant := func(label string) {

var c any

if arg < len(program.Constants) {

c = program.Constants[arg]

} else {

c = "out of range"

}

if r, ok := c.(*regexp.Regexp); ok {

c = r.String()

}

if field, ok := c.(*runtime.Field); ok {

c = fmt.Sprintf("{%v %v}", strings.Join(field.Path, "."), field.Index)

}

if method, ok := c.(*runtime.Method); ok {

c = fmt.Sprintf("{%v %v}", method.Name, method.Index)

}

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t%v\n", pp, label, arg, c)

}

builtinArg := func(label string) {

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t%v\n", pp, label, arg, builtin.Builtins[arg].Name)

}

switch op {

case OpInvalid:

code("OpInvalid")

case OpPush:

constant("OpPush")

case OpInt:

argument("OpInt")

case OpPop:

code("OpPop")

case OpStore:

argumentWithInfo("OpStore", "var")

case OpLoadVar:

argumentWithInfo("OpLoadVar", "var")

case OpLoadConst:

constant("OpLoadConst")

case OpLoadField:

constant("OpLoadField")

case OpLoadFast:

constant("OpLoadFast")

case OpLoadMethod:

constant("OpLoadMethod")

case OpLoadFunc:

argumentWithInfo("OpLoadFunc", "func")

case OpLoadEnv:

code("OpLoadEnv")

case OpFetch:

code("OpFetch")

case OpFetchField:

constant("OpFetchField")

case OpMethod:

constant("OpMethod")

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 OpJumpIfNil:

jump("OpJumpIfNil")

case OpJumpIfNotNil:

jump("OpJumpIfNotNil")

case OpJumpIfEnd:

jump("OpJumpIfEnd")

case OpJumpBackward:

jumpBack("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 OpSlice:

code("OpSlice")

case OpCall:

argument("OpCall")

case OpCall0:

argumentWithInfo("OpCall0", "func")

case OpCall1:

argumentWithInfo("OpCall1", "func")

case OpCall2:

argumentWithInfo("OpCall2", "func")

case OpCall3:

argumentWithInfo("OpCall3", "func")

case OpCallN:

argument("OpCallN")

case OpCallFast:

argument("OpCallFast")

case OpCallTyped:

signature := reflect.TypeOf(FuncTypes[arg]).Elem().String()

_, _ = fmt.Fprintf(w, "%v\t%v\t<%v>\t%v\n", pp, "OpCallTyped", arg, signature)

case OpCallBuiltin1:

builtinArg("OpCallBuiltin1")

case OpValidateArgs:

argument("OpValidateArgs")

case OpArray:

code("OpArray")

case OpMap:

code("OpMap")

case OpLen:

code("OpLen")

case OpCast:

argument("OpCast")

case OpDeref:

code("OpDeref")

case OpIncrementIndex:

code("OpIncrementIndex")

case OpDecrementIndex:

code("OpDecrementIndex")

case OpIncrementCount:

code("OpIncrementCount")

case OpGetIndex:

code("OpGetIndex")

case OpSetIndex:

code("OpSetIndex")

case OpGetCount:

code("OpGetCount")

case OpGetLen:

code("OpGetLen")

case OpGetGroupBy:

code("OpGetGroupBy")

case OpGetAcc:

code("OpGetAcc")

case OpPointer:

code("OpPointer")

case OpThrow:

code("OpThrow")

case OpGroupBy:

code("OpGroupBy")

case OpSetAcc:

code("OpSetAcc")

case OpBegin:

code("OpBegin")

case OpEnd:

code("OpEnd")

default:

_, _ = fmt.Fprintf(w, "%v\t%#x (unknown)\n", ip, op)

}

}

}

// Source returns origin file.Source.

func (program *Program) Source() *file.Source {

return program.source

}