/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="theOp">See base class documentation.</param>
/// <param name="conversionState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override void Convert(ILConversionState conversionState, ILOp theOp)
{
int currOpPosition = conversionState.PositionOf(theOp);
// Test if the object provided inherits from the specified class
// 1. Pop object ref
// 1.1. Test if object ref is null:
// 1.1.1 True: Push null and continue
// 1.1.2 False: Go to 2
// 2. Load object type
// 3. Test if object type == provided type:
// 3.1 True: Push object ref and continue
// 3.2 False:
// 3.2.1. Move to base type
// 3.2.2. Test if base type null:
// 3.2.2.1 True: Push null and continue
// 3.2.2.2 False: Jump back to (3)
// 1. Pop object ref
conversionState.Append(new ASMOps.Pop()
{
Size = ASMOps.OperandSize.Word, Dest = "$t0"
});
// 1.1. Test if object ref is null:
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t0", Src2 = "0", BranchType = ASMOps.BranchOp.BranchNotEqual, DestILPosition = currOpPosition, Extension = "False1", UnsignedTest = true
});
// 1.1.1 True: Push null and continue
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$zero"
});
conversionState.Append(new ASMOps.Branch()
{
BranchType = ASMOps.BranchOp.Branch, DestILPosition = currOpPosition, Extension = "End"
});
// 1.1.2 False: Go to 2
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "False1"
});
// 2. Load object type
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = "0($t0)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t1", 0, 4);
// 3. Test if object type == provided type:
int metadataToken = Utilities.ReadInt32(theOp.ValueBytes, 0);
Type theType = conversionState.Input.TheMethodInfo.UnderlyingInfo.Module.ResolveType(metadataToken);
Types.TypeInfo theTypeInfo = conversionState.TheILLibrary.GetTypeInfo(theType);
string TestTypeId = theTypeInfo.ID;
conversionState.AddExternalLabel(TestTypeId);
conversionState.Append(new ASMOps.La()
{
Label = TestTypeId, Dest = "$t2"
});
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Label3"
});
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t1", Src2 = "$t2", BranchType = ASMOps.BranchOp.BranchNotEqual, DestILPosition = currOpPosition, Extension = "False2", UnsignedTest = true
});
// 3.1 True: Push object ref and continue
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$t0"
});
conversionState.Append(new ASMOps.Branch()
{
BranchType = ASMOps.BranchOp.Branch, DestILPosition = currOpPosition, Extension = "End"
});
// 3.2 False:
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "False2"
});
// 3.2.1. Move to base type
int baseTypeOffset = conversionState.GetTypeFieldOffset("TheBaseType");
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = baseTypeOffset + "($t1)", Dest = "$t1" });
GlobalMethods.LoadData(conversionState, theOp, "$t1", "$t1", baseTypeOffset, 4);
// 3.2.2. Test if base type null:
// 3.2.2.2 False: Jump back to (3)
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t1", Src2 = "0", BranchType = ASMOps.BranchOp.BranchNotEqual, DestILPosition = currOpPosition, Extension = "Label3", UnsignedTest = true
});
// 3.2.2.1 True: Push null and continue
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$zero"
});
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "End"
});
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="theOp">See base class documentation.</param>
/// <param name="conversionState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if constant is a floating point number.
/// </exception>
public override void Convert(ILConversionState conversionState, ILOp theOp)
{
int currOpPosition = conversionState.PositionOf(theOp);
conversionState.AddExternalLabel(conversionState.GetThrowNullReferenceExceptionMethodInfo().ID);
conversionState.AddExternalLabel(conversionState.GetThrowIndexOutOfRangeExceptionMethodInfo().ID);
Type elementType = null;
bool pushValue = true;
int sizeToPush = 4;
bool signExtend = true;
bool isFloat = false;
switch ((OpCodes)theOp.opCode.Value)
{
case OpCodes.Ldelem:
{
signExtend = false;
//Load the metadata token used to get the type info
int metadataToken = Utilities.ReadInt32(theOp.ValueBytes, 0);
//Get the type info for the element type
elementType = conversionState.Input.TheMethodInfo.UnderlyingInfo.Module.ResolveType(metadataToken);
}
break;
case OpCodes.Ldelema:
{
signExtend = false;
//Load the metadata token used to get the type info
int metadataToken = Utilities.ReadInt32(theOp.ValueBytes, 0);
//Get the type info for the element type
elementType = conversionState.Input.TheMethodInfo.UnderlyingInfo.Module.ResolveType(metadataToken);
pushValue = false;
}
break;
case OpCodes.Ldelem_R4:
case OpCodes.Ldelem_R8:
//TODO - Add more LdElem op variants support
throw new NotSupportedException("Ldelem op variant not supported yet!");
case OpCodes.Ldelem_I1:
sizeToPush = 1;
elementType = typeof(sbyte);
break;
case OpCodes.Ldelem_I2:
sizeToPush = 2;
elementType = typeof(Int16);
break;
case OpCodes.Ldelem_U1:
sizeToPush = 1;
signExtend = false;
elementType = typeof(byte);
break;
case OpCodes.Ldelem_U2:
sizeToPush = 2;
signExtend = false;
elementType = typeof(UInt16);
break;
case OpCodes.Ldelem_Ref:
signExtend = false;
elementType = null;
break;
case OpCodes.Ldelem_U4:
signExtend = false;
elementType = typeof(UInt32);
break;
case OpCodes.Ldelem_I4:
elementType = typeof(Int32);
break;
case OpCodes.Ldelem_I8:
sizeToPush = 8;
elementType = typeof(Int64);
break;
}
if (isFloat)
{
//TODO - Support floats
throw new NotSupportedException("LdElem for floats not supported yet!");
}
//Get element from array and push the value onto the stack
// (or for LdElemA push the address of the value)
//This involves:
// 1. Check array reference is not null
// - If it is, throw NullReferenceException
// 2. Check array element type is correct
// - If not, throw ArrayTypeMismatchException
// 3. Check index to get is > -1 and < array length
// - If not, throw IndexOutOfRangeException
// 4. Calculate address of element
// 5. Push the element onto the stack
//Stack setup upon entering this op: (top-most downwards)
// 0. Index of element to get as Int32 (word)
// 1. Array object reference as address (word)
Types.TypeInfo arrayTypeInfo = conversionState.GetArrayTypeInfo();
// 1. Check array reference is not null
// 1.1. Move array ref into $t0
// 1.2. Compare $t0 (array ref) to 0
// 1.3. If not zero, jump to continue execution further down
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
// 1.1. Move array ref into $t0
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "4($sp)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg
});
// 1.2. Compare $t0 (array ref) to 0
// 1.3. If not zero, jump to continue execution further down
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t0", BranchType = ASMOps.BranchOp.BranchNotZero, DestILPosition = currOpPosition, Extension = "Continue1", UnsignedTest = true
});
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
conversionState.Append(new ASMOps.Call()
{
Target = "GetEIP"
});
conversionState.AddExternalLabel("GetEIP");
conversionState.Append(new ASMOps.Call()
{
Target = conversionState.GetThrowNullReferenceExceptionMethodInfo().ID
});
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Continue1"
});
// 2. Check array element type is correct
// 2.1. Move element type ref into $t0
// 2.2. Move element type ref from array object into $t1
// 2.3. Compare $t0 to $t1
// 2.4. If the same, jump to continue execution further down
// 2.5. Otherwise, call Exceptions.ThrowArrayTypeMismatchException
//string ContinueExecutionLabel2 = ContinueExecutionLabelBase + "2";
//// 2.1. Move element type ref into $t0
int elemTypeOffset = conversionState.TheILLibrary.GetFieldInfo(arrayTypeInfo, "elemType").OffsetInBytes;
// 3. Check index to get is > -1 and < array length
// 3.1. Move index into $t0
// 3.2. Move array length into $t1
// 3.2. Compare $t0 to 0
// 3.3. Jump if greater than to next test condition (3.5)
// 3.4. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
// 3.5. Compare $t0 to $t1
// 3.6. Jump if less than to continue execution further down
// 3.7. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
// 3.1. Move index into $t0
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "0($sp)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg
});
// 3.2. Move array length into $t2
// - Calculate the offset of the field from the start of the array object
int lengthOffset = conversionState.TheILLibrary.GetFieldInfo(arrayTypeInfo, "length").OffsetInBytes;
// - Move array ref into $t1
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "4($sp)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg
});
// - Move length value (offset($t1)) into $t1
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = lengthOffset.ToString() + "($t1)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t1", "$t1", lengthOffset, 4);
// 3.2. Compare $t0 to 0
// 3.3. Jump if greater than to next test condition (3.5)
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t0", Src2 = "$zero", BranchType = ASMOps.BranchOp.BranchGreaterThanEqual, DestILPosition = currOpPosition, Extension = "Continue3_1", UnsignedTest = false
});
// 3.4. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
conversionState.Append(new ASMOps.Call()
{
Target = conversionState.GetThrowIndexOutOfRangeExceptionMethodInfo().ID
});
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Continue3_1"
});
// 3.5. Compare $t0 to $t1
// 3.6. Jump if less than to continue execution further down
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t0", Src2 = "$t1", BranchType = ASMOps.BranchOp.BranchLessThan, DestILPosition = currOpPosition, Extension = "Continue3_2", UnsignedTest = false
});
// 3.7. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
conversionState.Append(new ASMOps.Call()
{
Target = conversionState.GetThrowIndexOutOfRangeExceptionMethodInfo().ID
});
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Continue3_2"
});
// 4. Calculate address of element
// 4.1. Pop index into $t1
// 4.2. Pop array ref into $t0
// 4.3. Move element type ref (from array ref) into $t0
// 4.4. Move IsValueType (from element ref type) into $t2
// 4.5. If IsValueType, continue to 4.6., else goto 4.8.
// 4.6. Move Size (from element type ref) into $t0
// 4.7. Skip over 4.8.
// 4.8. Move StackSize (from element type ref) into $t0
// 4.9. Mulitply $t0 by $t1 (index by element size)
// 4.10. Move array ref into $t1
// 4.11. Add enough to go past Kernel.FOS_System.Array fields
// 4.12. Add $t0 and $t1 (array ref + fields + (index * element size))
// 4.1. Pop index into $t1
conversionState.Append(new ASMOps.Pop()
{
Size = ASMOps.OperandSize.Word, Dest = "$t1"
});
// 4.2. Move array ref into $t0
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "0($sp)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg
});
// 4.3. Move element type ref (from array ref) into $t0
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = elemTypeOffset.ToString() + "($t0)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t0", elemTypeOffset, 4);
// 4.4. Move IsValueType (from element ref type) into $t2
int isValueTypeOffset = conversionState.GetTypeFieldOffset("IsValueType");
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "0", Dest = "$t2", MoveType = ASMOps.Mov.MoveTypes.ImmediateToReg
});
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Byte, Src = isValueTypeOffset.ToString() + "($t0)", Dest = "$t2", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t2", isValueTypeOffset, 1);
// 4.5. If IsValueType, continue to 4.6., else goto 4.8.
conversionState.Append(new ASMOps.Branch()
{
Src1 = "$t2", BranchType = ASMOps.BranchOp.BranchZero, DestILPosition = currOpPosition, Extension = "Continue4_1", UnsignedTest = true
});
// 4.6. Move Size (from element type ref) into $t0
int sizeOffset = conversionState.GetTypeFieldOffset("Size");
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = sizeOffset.ToString() + "($t0)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t0", sizeOffset, 4);
// 4.7. Skip over 4.8.
conversionState.Append(new ASMOps.Branch()
{
BranchType = ASMOps.BranchOp.Branch, DestILPosition = currOpPosition, Extension = "Continue4_2"
});
// 4.8. Move StackSize (from element type ref) into $t0
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Continue4_1"
});
int stackSizeOffset = conversionState.GetTypeFieldOffset("StackSize");
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = stackSizeOffset + "($t0)", Dest = "$t0", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t0", stackSizeOffset, 4);
// 4.9. Mulitply $t0 by $t1 (index by element size)
conversionState.Append(new ASMOps.Label()
{
ILPosition = currOpPosition, Extension = "Continue4_2"
});
conversionState.Append(new ASMOps.Mul()
{
Src1 = "$t1", Src2 = "$t0", Signed = true
});
// 4.10. Pop array ref into $t1
conversionState.Append(new ASMOps.Mflo()
{
Dest = "$t0"
});
conversionState.Append(new ASMOps.Pop()
{
Size = ASMOps.OperandSize.Word, Dest = "$t1"
});
// 4.11. Add enough to go past Kernel.FOS_System.Array fields
int allFieldsOffset = 0;
#region Offset calculation
{
Types.FieldInfo highestOffsetFieldInfo = arrayTypeInfo.FieldInfos.Where(x => !x.IsStatic).OrderByDescending(x => x.OffsetInBytes).First();
Types.TypeInfo fieldTypeInfo = conversionState.TheILLibrary.GetTypeInfo(highestOffsetFieldInfo.UnderlyingInfo.FieldType);
allFieldsOffset = highestOffsetFieldInfo.OffsetInBytes + (fieldTypeInfo.IsValueType ? fieldTypeInfo.SizeOnHeapInBytes : fieldTypeInfo.SizeOnStackInBytes);
}
#endregion
conversionState.Append(new ASMOps.Add()
{
Src1 = "$t1", Src2 = allFieldsOffset.ToString(), Dest = "$t1"
});
// 4.12. Add $t0 and $t1 (array ref + fields + (index * element size))
conversionState.Append(new ASMOps.Add()
{
Src1 = "$t1", Src2 = "$t0", Dest = "$t0"
});
// 5. Push the element onto the stack
// 5.1. Push value at ($t0) (except for LdElemA op in which case just push address)
if (pushValue)
{
switch (sizeToPush)
{
case 1:
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "0", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.ImmediateToReg
});
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Byte, Src = "0($t0)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t1", 0, 1, signExtend);
break;
case 2:
conversionState.Append(new ASMOps.Mov()
{
Size = ASMOps.OperandSize.Word, Src = "0", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.ImmediateToReg
});
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Halfword, Src = "0($t0)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t1", 0, 2, signExtend);
break;
case 4:
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = "0($t0)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t1", 0, 4);
break;
case 8:
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = "0($t0)", Dest = "$t1", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t1", 0, 4);
//conversionState.Append(new ASMOps.Mov() { Size = ASMOps.OperandSize.Word, Src = "4($t0)", Dest = "$t2", MoveType = ASMOps.Mov.MoveTypes.SrcMemoryToDestReg });
GlobalMethods.LoadData(conversionState, theOp, "$t0", "$t2", 4, 4);
break;
}
if (sizeToPush == 8)
{
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$t2"
});
}
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$t1"
});
}
else
{
conversionState.Append(new ASMOps.Push()
{
Size = ASMOps.OperandSize.Word, Src = "$t0"
});
}
Types.TypeInfo elemTypeInfo = elementType == null ? null : conversionState.TheILLibrary.GetTypeInfo(elementType);
// 5.2. Pop index and array ref from our stack
conversionState.CurrentStackFrame.Stack.Pop();
conversionState.CurrentStackFrame.Stack.Pop();
// 5.3. Push element onto our stack
conversionState.CurrentStackFrame.Stack.Push(new StackItem()
{
sizeOnStackInBytes = sizeToPush > 4 ? 8 : 4,
isFloat = isFloat,
isNewGCObject = false,
isGCManaged = pushValue ? (elementType == null || elemTypeInfo.IsGCManaged) : false,
isValue = pushValue ? (elementType != null && elemTypeInfo.IsValueType) : false
});
}