|
public ADDL ( |
||
| er | ||
| ee | System.Reg | |
| comment | String | |
| return | void | |
public override void CalcAndSaveByte(CGenState state) {
state.ADDL(1, Reg.EAX);
state.MOVB(Reg.AL, 0, Reg.ECX);
}
public override void CalcAndSavePtr(CGenState state) {
state.ADDL(this.Expr.Type.SizeOf, Reg.EAX);
state.MOVL(Reg.EAX, 0, Reg.ECX);
}
public override void CalcAndSaveWord(CGenState state) {
state.ADDL(1, Reg.EAX);
state.MOVW(Reg.AX, 0, Reg.ECX);
}
public override void CalcAndSaveLong(CGenState state) {
state.ADDL(1, Reg.EAX);
state.MOVL(Reg.EAX, 0, Reg.ECX);
}
public override void CGenAddress(CGenState state) {
if (this.Expr.Type.Kind != ExprTypeKind.STRUCT_OR_UNION) {
throw new InvalidProgramException();
}
// %eax = address of struct or union
this.Expr.CGenAddress(state);
// offset inside the pack
Int32 offset = ((StructOrUnionType)this.Expr.Type)
.Attribs
.First(_ => _.name == this.Name)
.offset;
state.ADDL(offset, Reg.EAX);
}
public override Reg CGenValue(CGenState state) {
// %eax is the address of the struct/union
if (this.Expr.CGenValue(state) != Reg.EAX) {
throw new InvalidProgramException();
}
if (this.Expr.Type.Kind != ExprTypeKind.STRUCT_OR_UNION) {
throw new InvalidProgramException();
}
// size of the struct or union
Int32 struct_size = this.Expr.Type.SizeOf;
// offset inside the pack
Int32 attrib_offset = ((StructOrUnionType)this.Expr.Type)
.Attribs
.First(_ => _.name == this.Name)
.offset;
// can't be a function designator.
switch (this.Type.Kind) {
case ExprTypeKind.ARRAY:
case ExprTypeKind.STRUCT_OR_UNION:
state.ADDL(attrib_offset, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.CHAR:
state.MOVSBL(attrib_offset, Reg.EAX, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.UCHAR:
state.MOVZBL(attrib_offset, Reg.EAX, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.SHORT:
state.MOVSWL(attrib_offset, Reg.EAX, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.USHORT:
state.MOVZWL(attrib_offset, Reg.EAX, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.LONG:
case ExprTypeKind.ULONG:
case ExprTypeKind.POINTER:
state.MOVL(attrib_offset, Reg.EAX, Reg.EAX);
return Reg.EAX;
case ExprTypeKind.FLOAT:
state.FLDS(attrib_offset, Reg.EAX);
return Reg.ST0;
case ExprTypeKind.DOUBLE:
state.FLDL(attrib_offset, Reg.EAX);
return Reg.ST0;
default:
throw new InvalidProgramException();
}
}
public override void OperateULong(CGenState state) {
state.ADDL(Reg.EBX, Reg.EAX);
}
