module dmd.ArrayLengthExp;

import dmd.common;
import dmd.Expression;
import dmd.backend.elem;
import dmd.UnaExp;
import dmd.InterState;
import dmd.OutBuffer;
import dmd.Loc;
import dmd.Scope;
import dmd.IRState;
import dmd.HdrGenState;
import dmd.TOK;
import dmd.Type;
import dmd.WANT;

import dmd.expression.ArrayLength;

import dmd.backend.Util;
import dmd.backend.OPER;

class ArrayLengthExp : UnaExp
{
	this(Loc loc, Expression e1)
	{
		super(loc, TOK.TOKarraylength, ArrayLengthExp.sizeof, e1);
	}

	override Expression semantic(Scope sc)
	{
		Expression e;

	version (LOGSEMANTIC) {
		printf("ArrayLengthExp::semantic('%s')\n", toChars());
	}
		if (!type)
		{
			UnaExp.semantic(sc);
			e1 = resolveProperties(sc, e1);

			type = Type.tsize_t;
		}
		return this;
	}

	override Expression optimize(int result)
	{
		//printf("ArrayLengthExp::optimize(result = %d) %s\n", result, toChars());
		e1 = e1.optimize(WANTvalue | (result & WANTinterpret));
		Expression e = this;
		if (e1.op == TOKstring || e1.op == TOKarrayliteral || e1.op == TOKassocarrayliteral)
		{
			e = ArrayLength(type, e1);
		}
		return e;
	}

	override Expression interpret(InterState istate)
	{
		assert(false);
	}

	override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
	{
		assert(false);
	}

	override elem* toElem(IRState* irs)
	{
		elem *e = e1.toElem(irs);
		e = el_una(OP64_32, type.totym(), e);
		el_setLoc(e,loc);
		return e;
	}
}