/// <summary>
/// Emits the specified platform instruction.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="emitter">The emitter.</param>
/// <exception cref="System.InvalidOperationException">@unable to emit opcode for segment register</exception>
internal override void EmitLegacy(InstructionNode node, X86CodeEmitter emitter)
{
if (node.Result.IsCPURegister)
{
if (node.Result.Register is SegmentRegister)
{
switch ((node.Result.Register as SegmentRegister).Segment)
{
case SegmentRegister.SegmentType.DS: emitter.Emit(POP_DS); return;
case SegmentRegister.SegmentType.ES: emitter.Emit(POP_ES); return;
case SegmentRegister.SegmentType.FS: emitter.Emit(POP_FS); return;
case SegmentRegister.SegmentType.GS: emitter.Emit(POP_GS); return;
case SegmentRegister.SegmentType.SS: emitter.Emit(POP_SS); return;
default: throw new InvalidOperationException(@"unable to emit opcode for segment register");
}
}
else
{
emitter.WriteByte((byte)(0x58 + node.Result.Register.RegisterCode));
}
}
else
{
emitter.Emit(POP, node.Result);
}
}
/// <summary>
/// Emits the specified platform instruction.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="emitter">The emitter.</param>
internal override void EmitLegacy(InstructionNode node, X86CodeEmitter emitter)
{
if (node.OperandCount == 0)
{
emitter.EmitRelativeBranch(CALL, node.BranchTargets[0].Label);
return;
}
if (node.Operand1.IsSymbol)
{
emitter.WriteByte(0xE8);
emitter.EmitCallSite(node.Operand1);
}
else
{
emitter.Emit(RegCall, node.Operand1);
}
}
/// <summary>
/// Emits the specified platform instruction.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="emitter">The emitter.</param>
internal override void EmitLegacy(InstructionNode node, X86CodeEmitter emitter)
{
if (node.Operand1 == null)
{
emitter.EmitRelativeBranch(JMP, node.BranchTargets[0].Label);
}
else
{
if (node.Operand1.IsSymbol)
{
emitter.WriteByte(0xE9);
emitter.EmitCallSite(node.Operand1);
}
else if (node.Operand1.IsCPURegister)
{
emitter.Emit(JMP_R, node.Operand1);
}
}
}
/// <summary>
/// Emits the specified platform instruction.
/// </summary>
/// <param name="ctx">The context.</param>
/// <param name="emitter">The emitter.</param>
internal override void EmitLegacy(InstructionNode node, X86CodeEmitter emitter)
{
emitter.WriteByte(0xF0);
}
/// <summary>
/// Emits the specified platform instruction.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="emitter">The emitter.</param>
internal override void EmitLegacy(InstructionNode node, X86CodeEmitter emitter)
{
emitter.WriteByte(0xCD);
emitter.WriteByte((byte)node.Operand1.ConstantUnsignedInteger);
}