using CLanguage.Compiler; using CLanguage.Types; using System; using System.Runtime.CompilerServices; namespace CLanguage.Syntax { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] public abstract class Expression { public Location Location { get; set; } public Location EndLocation { get; set; } public bool HasError { get; set; } public virtual bool CanEmitPointer => false; public void Emit(EmitContext ec) { DoEmit(ec); } public void EmitPointer(EmitContext ec) { DoEmitPointer(ec); } public abstract CType GetEvaluatedCType(EmitContext ec); protected abstract void DoEmit(EmitContext ec); protected virtual void DoEmitPointer(EmitContext ec) { throw new NotSupportedException($"""{GetType().Name}""{this}"""); } protected static CType GetPromotedType(Expression expr, string op, EmitContext ec) { CType evaluatedCType = expr.GetEvaluatedCType(ec); CBasicType cBasicType = evaluatedCType as CBasicType; if (cBasicType != null) return cBasicType.IntegerPromote(ec); CArrayType cArrayType = evaluatedCType as CArrayType; if (cArrayType != null) return cArrayType.ElementType.Pointer; if (evaluatedCType is CPointerType) return evaluatedCType; ec.Report.Error(19, "'" + op + "' cannot be applied to operand of type '" + evaluatedCType?.ToString() + "'"); return CBasicType.SignedInt; } protected static CType GetArithmeticType(Expression leftExpr, Expression rightExpr, string op, EmitContext ec) { CType evaluatedCType = leftExpr.GetEvaluatedCType(ec); CType evaluatedCType2 = rightExpr.GetEvaluatedCType(ec); CBasicType cBasicType = evaluatedCType as CBasicType; CBasicType cBasicType2 = evaluatedCType2 as CBasicType; if (cBasicType != null && cBasicType2 != null) return cBasicType.ArithmeticConvert(cBasicType2, ec); CPointerType cPointerType = evaluatedCType as CPointerType; if (cPointerType != null && cBasicType2 != null) return cPointerType; CArrayType cArrayType = evaluatedCType as CArrayType; if (cArrayType != null && cBasicType2 != null) return cArrayType.ElementType.Pointer; CPointerType cPointerType2 = evaluatedCType2 as CPointerType; if (cPointerType2 != null && cBasicType != null) return cPointerType2; CArrayType cArrayType2 = evaluatedCType2 as CArrayType; if (cArrayType2 != null && cBasicType != null) return cArrayType2.ElementType.Pointer; ec.Report.Error(19, "'" + op + "' cannot be applied to operands of type '" + evaluatedCType?.ToString() + "' and '" + evaluatedCType2?.ToString() + "'"); return CBasicType.SignedInt; } public virtual Value EvalConstant(EmitContext ec) { ec.Report.Error(133, $"""{this}"""); return 0; } } }