public static int IdentifyJumpOrReturn(BytecodeInstruction bci)
{
int op = (int)bci.opcode;
if (op > 68 && op <= 72) //return op
{
return(0);
}
if (op == 84) //JMP
{
return(1);
}
if (op >= 0 && op <= 15) //comparison op
{
return(3);
}
if (op > 72 && op <= 82) //for loop or iterator loop
{
return(4);
}
if (op == 48) //UCLO
{
return(5);
}
return(-1); //not jump or return.
}
/// <summary>
/// Contains an IRMap translated opcode and the registers at execution time for a particular bytecode instruction.
/// </summary>
/// <param name="iROp"></param>
/// <param name="originalOp"></param>
/// <param name="originalIndex">Index of original instruction.</param>
/// <param name="regA"></param>
/// <param name="regB"></param>
/// <param name="regC"></param>
public IntegratedInstruction(IRMap iROp, BytecodeInstruction bci)
{
this.bci = bci;
this.iROp = iROp;
registers = bci.regs;
originalOp = bci.opcode;
originalIndex = bci.index;
}
private BytecodeInstruction GetJumpInstruction(int index)
{
BytecodeInstruction bci = bytecodeInstructions[index];
if (DecompilePrototype.IdentifyJumpOrReturn(bci) <= 0)
{
return(null);
}
return(bci);
}
private void AddTopOfFileJump()
{
BytecodeInstruction jmpTop = new BytecodeInstruction(OpCodes.JMP, -1);
jmpTop.registers.a = 0;
jmpTop.registers.c = 0;
jmpTop.registers.b = 128;
Jump top = new Jump(jmpTop, 1, -1, pt);
jumps.Add(top);
}
public Jump(BytecodeInstruction jmp, int jumpType, int nameIndex, Prototype pt)
{
index = jmp.bciIndexInPrototype;
this.jumpType = jumpType;
if (jumpType == 1) //calculate jump distance. may be negative.
{
distance = ((jmp.registers.b << 8) | jmp.registers.c) - 0x8000;
}
else if (jumpType == 3)
{
distance = 1; //conditionals/returns
}
target = index + distance + 1; //the target bci.
}
public Comparison(LStateContext ctx, BytecodeInstruction bci)
{
this.ctx = ctx;
this.bci = bci;
}
/// <summary>
/// (A op B)
/// Example: (A == 2)
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <param name="op"></param>
public Condition(Prototype pt, BytecodeInstruction condi)
{
//this.a = a;
//this.b = b;
op = map[condi.opcode];
}
