private ILExpression BuildExpression(ILInstruction instruction, ILCompilationUnit result)
{
IILArgumentsProvider expression;
switch (instruction.OpCode.Code)
{
case ILCode.VCALL:
expression = new ILVCallExpression((VCallAnnotation)instruction.Annotation);
break;
case ILCode.PUSHR_BYTE:
case ILCode.PUSHR_WORD:
case ILCode.PUSHR_DWORD:
case ILCode.PUSHR_QWORD:
case ILCode.PUSHR_OBJECT:
expression = BuildPushrExpression(instruction, result);
break;
default:
expression = new ILInstructionExpression(instruction);
break;
}
for (int i = 0; i < instruction.Dependencies.Count; i++)
{
ILExpression argument;
var firstDataSource = instruction.Dependencies[i].DataSources.First();
if (firstDataSource.Offset == InstructionProcessor.PushExceptionOffset)
{
var exceptionType = (ITypeDefOrRef)firstDataSource.Operand;
argument = new ILExceptionExpression(exceptionType);
}
else
{
// Get the variable containing the value of the argument and add it as an argument to the expression.
string variableName = GetOperandVariableName(instruction, i);
if (_sharedVariables.TryGetValue(variableName, out string realName))
{
variableName = realName;
}
argument = new ILVariableExpression(
result.GetOrCreateVariable(variableName));
}
expression.Arguments.Add(argument);
}
return((ILExpression)expression);
}
private ILExpression BuildExpression(ILInstruction instruction, ILCompilationUnit result)
{
IILArgumentsProvider expression;
switch (instruction.OpCode.Code)
{
case ILCode.VCALL:
expression = new ILVCallExpression((VCallAnnotation)instruction.Annotation);
break;
case ILCode.PUSHR_BYTE:
case ILCode.PUSHR_WORD:
case ILCode.PUSHR_DWORD:
case ILCode.PUSHR_QWORD:
case ILCode.PUSHR_OBJECT:
// Since we treat registers as variables, we should interpret the operand as a variable and add it
// as an argument to the expression instead of keeping it just as an operand. This makes it easier
// to apply analysis and transformations (such as variable inlining) later, in the same way we do
// that with normal variables.
expression = new ILInstructionExpression(instruction);
ILVariable registerVar;
if (instruction.Operand is VMRegisters.FL)
{
var dataSources = instruction.ProgramState.Registers[VMRegisters.FL].DataSources
.Select(i => i.Offset)
.ToArray();
var flagsVariable = result.GetOrCreateFlagsVariable(dataSources);
registerVar = flagsVariable;
}
else
{
registerVar = result.GetOrCreateVariable(instruction.Operand.ToString());
}
var varExpression = new ILVariableExpression(registerVar);
expression.Arguments.Add(varExpression);
break;
default:
expression = new ILInstructionExpression(instruction);
break;
}
for (int i = 0; i < instruction.Dependencies.Count; i++)
{
ILExpression argument;
var firstDataSource = instruction.Dependencies[i].DataSources.First();
if (firstDataSource.Offset == InstructionProcessor.PushExceptionOffset)
{
var exceptionType = (ITypeDefOrRef)firstDataSource.Operand;
argument = new ILExceptionExpression(exceptionType);
}
else
{
// Get the variable containing the value of the argument and add it as an argument to the expression.
string variableName = GetOperandVariableName(instruction, i);
if (_sharedVariables.TryGetValue(variableName, out string realName))
{
variableName = realName;
}
argument = new ILVariableExpression(
result.GetOrCreateVariable(variableName));
}
expression.Arguments.Add(argument);
}
return((ILExpression)expression);
}