/// <summary>
/// Writes an <see cref="OperandType.InlineSwitch"/> operand
/// </summary>
/// <param name="writer">Instruction writer</param>
/// <param name="instr">Instruction</param>
protected virtual void WriteInlineSwitch(ref ArrayWriter writer, Instruction instr)
{
var targets = instr.Operand as IList <Instruction>;
if (targets is null)
{
Error("switch operand is not a list of instructions");
writer.WriteInt32(0);
}
else
{
uint offsetAfter = (uint)(ToInstructionOffset(ref writer) + 4 + targets.Count * 4);
writer.WriteInt32(targets.Count);
for (int i = 0; i < targets.Count; i++)
{
var target = targets[i];
writer.WriteUInt32(GetOffset(target) - offsetAfter);
}
}
}
/// <summary>
/// Writes a <see cref="OperandType.ShortInlineVar"/> operand
/// </summary>
/// <param name="writer">Instruction writer</param>
/// <param name="instr">Instruction</param>
protected virtual void WriteShortInlineVar(ref ArrayWriter writer, Instruction instr)
{
var variable = instr.Operand as IVariable;
if (variable is null)
{
Error("Operand is not a local/arg");
writer.WriteByte(0);
}
else
{
int index = variable.Index;
if (byte.MinValue <= index && index <= byte.MaxValue)
{
writer.WriteByte((byte)index);
}
else
{
Error("Local/arg index doesn't fit in a Byte. Use the longer ldloc/ldarg/stloc/starg instruction.");
writer.WriteByte(0);
}
}
}
/// <summary>
/// Writes an <see cref="OperandType.InlineVar"/> operand
/// </summary>
/// <param name="writer">Instruction writer</param>
/// <param name="instr">Instruction</param>
protected virtual void WriteInlineVar(ref ArrayWriter writer, Instruction instr)
{
var variable = instr.Operand as IVariable;
if (variable is null)
{
Error("Operand is not a local/arg");
writer.WriteUInt16(0);
}
else
{
int index = variable.Index;
if (ushort.MinValue <= index && index <= ushort.MaxValue)
{
writer.WriteUInt16((ushort)index);
}
else
{
Error("Local/arg index doesn't fit in a UInt16");
writer.WriteUInt16(0);
}
}
}
/// <summary> /// Writes an <see cref="OperandType.InlineType"/> operand /// </summary> /// <param name="writer">Instruction writer</param> /// <param name="instr">Instruction</param> protected abstract void WriteInlineType(ref ArrayWriter writer, Instruction instr);
/// <summary>
/// Writes an <see cref="OperandType.InlinePhi"/> operand
/// </summary>
/// <param name="writer">Instruction writer</param>
/// <param name="instr">Instruction</param>
protected virtual void WriteInlinePhi(ref ArrayWriter writer, Instruction instr)
{
}
/// <summary>
/// Writes an <see cref="OperandType.InlineBrTarget"/> operand
/// </summary>
/// <param name="writer">Instruction writer</param>
/// <param name="instr">Instruction</param>
protected virtual void WriteInlineBrTarget(ref ArrayWriter writer, Instruction instr)
{
uint displ = GetOffset(instr.Operand as Instruction) - (ToInstructionOffset(ref writer) + 4);
writer.WriteUInt32(displ);
}
/// <summary>
/// Writes an instruction
/// </summary>
/// <param name="writer">The instruction writer</param>
/// <param name="instr">The instruction</param>
protected virtual void WriteInstruction(ref ArrayWriter writer, Instruction instr)
{
WriteOpCode(ref writer, instr);
WriteOperand(ref writer, instr);
}
/// <summary> /// Gets the current offset in the instruction stream. This offset is relative to /// the first written instruction. /// </summary> /// <param name="writer">The instruction writer</param> /// <returns>Current offset, relative to the first written instruction</returns> protected uint ToInstructionOffset(ref ArrayWriter writer) => (uint)writer.Position - firstInstructionOffset;