CPunch/LuaDecompy
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lparser.py: don't read RK values here, use lundump.py to read them

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CPunch 2022-08-11 16:45:05 -05:00
parent eb1d3ffe87
commit 055af56e27
2 changed files with 19 additions and 19 deletions
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24
README.md
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@ -26,18 +26,18 @@ example.luac
==== [[example.lua's dissassembly]] ====
[ 0] LOADK : R[0] K[1]
[ 1] LOADK : R[1] K[2]
[ 2] CONCAT : R[0] R[0] R[1]
[ 3] SETGLOBAL : R[0] R[0]
[ 4] EQ : R[0] K[3] K[3]
[ 5] JMP : R[0] R[5]
[ 6] GETGLOBAL : R[0] K[4]
[ 7] GETGLOBAL : R[1] K[0]
[ 8] GETTABLE : R[0] R[0] R[1]
[ 9] LOADK : R[1] K[5]
[ 10] CALL : R[0] R[2] R[1]
[ 11] RETURN : R[0] R[1] R[0]
[ 0] LOADK : R[0] K[1] ; load "pri" into R[0]
[ 1] LOADK : R[1] K[2] ; load "nt" into R[1]
[ 2] CONCAT : R[0] R[0] R[1] ; concat 2 values from R[0] to R[1]
[ 3] SETGLOBAL : R[0] R[0] ;
[ 4] EQ : R[0] K[3] K[3] ;
[ 5] JMP : R[0] R[5] ;
[ 6] GETGLOBAL : R[0] K[4] ;
[ 7] GETGLOBAL : R[1] K[0] ;
[ 8] GETTABLE : R[0] R[0] R[1] ;
[ 9] LOADK : R[1] K[5] ; load "Hello world" into R[1]
[ 10] CALL : R[0] R[2] R[1] ;
[ 11] RETURN : R[0] R[1] R[0] ;
==== [[example.lua's decompiled source]] ====

14
lparser.py
View File

@ -1,14 +1,14 @@
'''
lparser.py
Depends on ldump.py for lua dump deserialization.
Depends on lundump.py for lua dump deserialization.
An experimental bytecode decompiler.
'''
from operator import concat
from subprocess import call
from lundump import Chunk, LuaUndump, Constant, Instruction, InstructionType, Opcodes
from lundump import Chunk, Constant, Instruction, Opcodes, whichRK, readRKasK
class _Scope:
def __init__(self, startPC: int, endPC: int):
@ -104,8 +104,8 @@ class LuaDecomp:
# 'RK's are special in because can be a register or a konstant. a bitflag is read to determine which
def __readRK(self, rk: int) -> str:
if (rk & (1 << 8)) > 0:
return self.chunk.constants[(rk & ~(1 << 8))].toCode()
if (whichRK(rk)) > 0:
return self.chunk.getConstant(readRKasK(rk)).toCode()
else:
return self.__getReg(rk)
@ -117,19 +117,19 @@ class LuaDecomp:
# move registers
self.__setReg(instr.A, self.__getReg(instr.B))
elif instr.opcode == Opcodes.LOADK:
self.__setReg(instr.A, self.chunk.constants[instr.B].toCode())
self.__setReg(instr.A, self.chunk.getConstant(instr.B).toCode())
elif instr.opcode == Opcodes.LOADBOOL:
if instr.B == 0:
self.__setReg(instr.A, "false")
else:
self.__setReg(instr.A, "true")
elif instr.opcode == Opcodes.GETGLOBAL:
self.__setReg(instr.A, self.chunk.constants[instr.B].data)
self.__setReg(instr.A, self.chunk.getConstant(instr.B).data)
elif instr.opcode == Opcodes.GETTABLE:
self.__setReg(instr.A, self.__getReg(instr.B) + "[" + self.__readRK(instr.C) + "]")
elif instr.opcode == Opcodes.SETGLOBAL:
self.__startStatement()
self.__addExpr(self.chunk.constants[instr.B].data + " = " + self.__getReg(instr.A))
self.__addExpr(self.chunk.getConstant(instr.B).data + " = " + self.__getReg(instr.A))
elif instr.opcode == Opcodes.SETTABLE:
self.__startStatement()
self.__addExpr(self.__getReg(instr.A) + "[" + self.__readRK(instr.B) + "] = " + self.__readRK(instr.C))