/// <summary>
/// Call a function; push the instruction pointer and jump to the given address.
/// </summary>
public static HITResult Call(HITThread thread)
{
uint targ = thread.ReadUInt32();
thread.Stack.Push((int)thread.PC);
thread.PC = PCTrans(targ, thread);
return(HITResult.CONTINUE);
}
/// <summary>
/// If the sign flag is set or the zero flag is set, jump to the given address.
/// </summary>
public static HITResult IfLessOrEq(HITThread thread)
{
var loc = thread.ReadUInt32();
if (thread.SignFlag || thread.ZeroFlag)
{
thread.PC = PCTrans(loc, thread); //last set/compare result was <= 0
}
return(HITResult.CONTINUE);
}
/// <summary>
/// If the sign flag is not set and the zero flag is not set, jump to the given address
/// </summary>
public static HITResult IfGreater(HITThread thread) //0x40
{
var loc = thread.ReadUInt32();
if (!thread.SignFlag && !thread.ZeroFlag)
{
thread.PC = PCTrans(loc, thread); //last set/compare result was > 0
}
return(HITResult.CONTINUE);
}
/// <summary>
/// If the sign flag is not set, jump to the given address.
/// </summary>
public static HITResult IfGreatOrEq(HITThread thread)
{
var loc = thread.ReadUInt32();
if (!thread.SignFlag)
{
thread.PC = loc; //last set/compare result was >= 0
}
return(HITResult.CONTINUE);
}
/// <summary>
/// If the zero flag is not set, jump to the given address.
/// </summary>
public static HITResult IfNotEqual(HITThread thread)
{
var loc = thread.ReadUInt32();
if (!thread.ZeroFlag)
{
thread.PC = PCTrans(loc, thread);
}
return(HITResult.CONTINUE);
}
/// <summary>
/// If the zero flag is set, jump to the given address.
/// </summary>
public static HITResult IfEqual(HITThread thread)
{
var loc = thread.ReadUInt32();
if (thread.ZeroFlag)
{
thread.PC = loc;
}
return(HITResult.CONTINUE);
}
/// <summary>
/// Jump to a given address.
/// </summary>
public static HITResult Jump(HITThread thread)
{
var read = thread.ReadByte();
if (read > 15) //literal
{
thread.PC--; //backtraaackkk
thread.PC = PCTrans(thread.ReadUInt32(), thread);
}
else //no idea if there are collisions. if there are i'm blaming fatbag. >:)
{
thread.PC = PCTrans((uint)thread.ReadVar(read), thread);
if (thread.ReadByte() == 0)
{
thread.PC += 2; //if next is no-op, the operand is 4 byte
}
else
{
thread.PC--; //operand is 1 byte (next is an instruction), backtrack
}
}
return(HITResult.CONTINUE);
}
/// <summary>
/// Jump to a given address.
/// </summary>
public static HITResult Jump(HITThread thread)
{
var read = thread.ReadByte();
if (read > 15) //literal
{
thread.PC--; //backtraaackkk
thread.PC = thread.ReadUInt32();
}
else //no idea if there are collisions. if there are i'm blaming fatbag. >:)
{
thread.PC = (uint)thread.ReadVar(read);
if (thread.ReadByte() == 0) thread.PC += 2; //if next is no-op, the operand is 4 byte
else thread.PC--; //operand is 1 byte (next is an instruction), backtrack
}
return HITResult.CONTINUE;
}
/// <summary>
/// If the zero flag is not set, jump to the given address.
/// </summary>
public static HITResult IfNotEqual(HITThread thread)
{
var loc = thread.ReadUInt32();
if (!thread.ZeroFlag) thread.PC = loc;
return HITResult.CONTINUE;
}
/// <summary>
/// If the sign flag is set or the zero flag is set, jump to the given address.
/// </summary>
public static HITResult IfLessOrEq(HITThread thread)
{
var loc = thread.ReadUInt32();
if (thread.SignFlag || thread.ZeroFlag) thread.PC = loc; //last set/compare result was <= 0
return HITResult.CONTINUE;
}
/// <summary>
/// If the sign flag is not set, jump to the given address.
/// </summary>
public static HITResult IfGreatOrEq(HITThread thread)
{
var loc = thread.ReadUInt32();
if (!thread.SignFlag) thread.PC = loc; //last set/compare result was >= 0
return HITResult.CONTINUE;
}
/// <summary>
/// Call a function; push the instruction pointer and jump to the given address.
/// </summary>
public static HITResult Call(HITThread thread)
{
uint targ = thread.ReadUInt32();
thread.Stack.Push((int)thread.PC);
thread.PC = targ;
return HITResult.CONTINUE;
}