public Expression BuildInstructionSpaceExpression(IEnumerable<InstructionInfo> instructions,
IProgramControlExpressionLibrary programControlExpressionLibrary,
IInstructionExpressionBuilder instructionBuilder,
InstructionSpace instructionSpace)
{
if (instructionSpace.Prefix == null)
return BuildSwitch(instructions, programControlExpressionLibrary, instructionBuilder, String.Empty);
else
return BuildSwitch(instructions, programControlExpressionLibrary, instructionBuilder, instructionSpace.Prefix);
}
public Expression BuildInstructionSpaceExpression(IEnumerable<InstructionInfo> instructions,
IProgramControlExpressionLibrary programControlExpressionLibrary,
IInstructionExpressionBuilder instructionBuilder,
InstructionSpace instructionSpace)
{
List<SwitchCase> switchCases = new List<SwitchCase>();
foreach (var info in instructions)
{
if (String.IsNullOrEmpty(info.Prefix))
continue;
if (info.Prefix.StartsWith(instructionSpace.Prefix))
{
switchCases.Add(
Expression.SwitchCase(instructionBuilder.BuildExpression(info),
Expression.Constant(info.Opcode))
);
}
}
return Expression.Block(
// Read index parameter.
// index - (index & 0x80) << 1 - Handles negative indexes.
Expression.Assign(programControlExpressionLibrary.ParameterByte2, programControlExpressionLibrary.ReadAndIncrementProgramCounter),
Expression.Assign(programControlExpressionLibrary.ParameterByte1,
Expression.Subtract(
programControlExpressionLibrary.ParameterByte2,
Expression.LeftShift(
Expression.And(programControlExpressionLibrary.ParameterByte2, Expression.Constant(0x80)), Expression.Constant(0x01)
)
)
),
Expression.Switch(programControlExpressionLibrary.ReadAndIncrementProgramCounter,
Expression.Assign(programControlExpressionLibrary.ParameterByte1, programControlExpressionLibrary.ParameterByte1),
switchCases.ToArray())
);
}
