SsaVariable GetVariableFromLoadAddressInstruction(Instruction loadAddressInstruction)
{
if (loadAddressInstruction.OpCode == OpCodes.Ldloca)
{
return(ssaForm.GetOriginalVariable((VariableReference)loadAddressInstruction.Operand));
}
else
{
Debug.Assert(loadAddressInstruction.OpCode == OpCodes.Ldarga);
return(ssaForm.GetOriginalVariable((ParameterReference)loadAddressInstruction.Operand));
}
}
void DetermineOperands(int stackSize, Instruction inst, int popCount, int pushCount, out SsaVariable target, out SsaVariable[] operands)
{
switch (inst.OpCode.Code)
{
case Code.Ldarg:
operands = new SsaVariable[] { ssaForm.GetOriginalVariable((ParameterReference)inst.Operand) };
target = stackLocations[stackSize];
break;
case Code.Starg:
operands = new SsaVariable[] { stackLocations[stackSize] };
target = ssaForm.GetOriginalVariable((ParameterReference)inst.Operand);
break;
case Code.Ldloc:
operands = new SsaVariable[] { ssaForm.GetOriginalVariable((VariableReference)inst.Operand) };
target = stackLocations[stackSize];
break;
case Code.Stloc:
operands = new SsaVariable[] { stackLocations[stackSize] };
target = ssaForm.GetOriginalVariable((VariableReference)inst.Operand);
break;
case Code.Dup:
operands = new SsaVariable[] { stackLocations[stackSize] };
target = stackLocations[stackSize + 1];
break;
default:
operands = new SsaVariable[popCount];
for (int i = 0; i < popCount; i++)
{
operands[i] = stackLocations[stackSize + i];
}
switch (pushCount)
{
case 0:
target = null;
break;
case 1:
target = stackLocations[stackSize];
break;
default:
throw new NotSupportedException("unsupported pushCount=" + pushCount);
}
break;
}
}
