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/*jshint esversion: 6 */
"use strict";
const DataView = require('buffer-dataview');
const fs = require('fs');
const assert = require('assert');
const lua_State = require('./lstate.js').lua_State;
const LClosure = require('./lobject.js').LClosure;
const Proto = require('./lfunc.js').Proto;
const constant_types = require('./lua.js').constant_types;
const LUAI_MAXSHORTLEN = 40;
/**
* Parse Lua 5.3 bytecode
* @see {@link http://www.lua.org/source/5.3/lundump.c.html|lundump.c}
*/
class BytecodeParser {
/**
* Initilialize bytecode parser
* @constructor
* @param {lua_State} Lua state object
* @param {DataView} dataView Contains the binary data
*/
constructor(L, dataView) {
this.intSize = 4;
this.size_tSize = 8;
this.instructionSize = 4;
this.integerSize = 8;
this.numberSize = 8;
this.L = L;
this.dataView = dataView;
this.offset = 0;
}
peekByte() {
return this.dataView.getUint8(this.offset, true);
}
readByte() {
let byte = this.peekByte();
this.offset++;
return byte;
}
peekInteger() {
return this.dataView.getInt32(this.offset, true);
}
readInteger() {
let integer = this.peekInteger();
this.offset += this.integerSize;
return integer;
}
peekInt() {
return this.dataView.getInt32(this.offset, true);
}
readInt() {
let integer = this.peekInt();
this.offset += 4;
return integer;
}
peekNumber() {
return this.dataView.getFloat64(this.offset, true);
}
readNumber() {
let number = this.peekNumber();
this.offset += this.numberSize;
return number;
}
readString(n) {
let size = typeof n !== 'undefined' ? n : this.readByte() - 1;
if (size === 0xFF) // TODO test
this.offset += this.size_tSize;
if (size === 0) {
return null;
}
let string = "";
for (let i = 0; i < size; i++)
string += String.fromCharCode(this.readByte());
return string;
}
readInstruction() {
let ins = new DataView(new Buffer(this.instructionSize))
for (let i = 0; i < this.instructionSize; i++)
ins.setUint8(i, this.readByte());
console.log(ins);
return ins;
}
readCode(f) {
let n = this.readInt();
for (let i = 0; i < n; i++)
f.code.push(this.readInstruction());
}
readConstants(f) {
let n = this.readInt();
for (let i = 0; i < n; i++) {
let t = this.readByte();
switch (t) {
case constant_types.LUA_TNIL:
f.k.push({
type: constant_types.LUA_TNIL,
value: null
});
console.log(`LUA_TNIL : ${f.k[f.k.length - 1].value}`);
break;
case constant_types.LUA_TBOOLEAN:
f.k.push({
type: constant_types.LUA_TBOOLEAN,
value: this.readByte()
});
console.log(`LUA_TBOOLEAN : ${f.k[f.k.length - 1].value}`);
break;
case constant_types.LUA_TNUMFLT:
f.k.push({
type: constant_types.LUA_TNUMFLT,
value: this.readNumber()
});
console.log(`LUA_TNUMFLT : ${f.k[f.k.length - 1].value}`);
break;
case constant_types.LUA_TNUMINT:
f.k.push({
type: constant_types.LUA_TNUMINT,
value: this.readInteger()
});
console.log(`LUA_TNUMINT : ${f.k[f.k.length - 1].value}`);
break;
case constant_types.LUA_TSHRSTR:
case constant_types.LUA_TLNGSTR:
f.k.push({
type: constant_types.LUA_TLNGSTR,
value: this.readString()
});
console.log(`LUA_TLNGSTR : ${f.k[f.k.length - 1].value}`);
break;
default:
throw new Error(`unrecognized constant '${t}'`);
}
}
}
readFunction(f, psource) {
f.source = this.readString();
if (f.source == null) /* no source in dump? */
f.source = psource; /* reuse parent's source */
f.linedefined = this.readInt();
f.lastlinedefined = this.readInt();
f.numparams = this.readByte();
f.is_vararg = this.readByte();
f.maxstacksize = this.readByte();
console.log(`
f.source = ${f.source}
f.linedefined = ${f.linedefined}
f.lastlinedefined = ${f.lastlinedefined}
f.numparams = ${f.numparams}
f.is_vararg = ${f.is_vararg}
f.maxstacksize = ${f.maxstacksize}
`);
this.readCode(f);
this.readConstants(f);
// this.readUpvalues(f);
// this.readProtos(f);
// this.readDebug(f);
}
checkHeader() {
if (this.readString(4) !== "\x1bLua")
throw new Error("bad LUA_SIGNATURE, expected '<esc>Lua'");
if (this.readByte() !== 0x53)
throw new Error("bad Lua version, expected 5.3");
if (this.readByte() !== 0)
throw new Error("supports only official PUC-Rio implementation");
if (this.readString(6) !== "\x19\x93\r\n\x1a\n")
throw new Error("bytecode corrupted");
this.intSize = this.readByte();
this.size_tSize = this.readByte();
this.instructionSize = this.readByte();
this.integerSize = this.readByte();
this.numberSize = this.readByte();
console.log(`
intSize = ${this.intSize}
size_tSize = ${this.size_tSize}
instructionSize = ${this.instructionSize}
integerSize = ${this.integerSize}
numberSize = ${this.numberSize}
`)
if (this.readInteger() !== 0x5678)
throw new Error("endianness mismatch");
if (this.readNumber() !== 370.5)
throw new Error("float format mismatch");
}
luaU_undump() {
this.checkHeader();
let cl = new LClosure(this.L, this.readByte());
this.L.top++;
cl.p = new Proto(this.L);
this.readFunction(cl.p);
// assert(cl.nupvalues === cl.p.upvalues.length);
return cl;
}
}
module.exports = BytecodeParser;
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