/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.graal.lir.ptx;

import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;

import com.oracle.graal.api.meta.*;
import com.oracle.graal.asm.*;
import com.oracle.graal.asm.ptx.*;
import com.oracle.graal.lir.*;
import com.oracle.graal.lir.asm.*;
import com.oracle.graal.nodes.calc.*;

public class PTXControlFlow {

    public static class ReturnOp extends PTXLIRInstruction {

        @Use({REG, ILLEGAL}) protected Value x;

        public ReturnOp(Value x) {
            this.x = x;
        }

        @Override
        public void emitCode(TargetMethodAssembler tasm, PTXAssembler masm) {
            if (tasm.frameContext != null) {
                tasm.frameContext.leave(tasm);
            }
            masm.exit();
        }
    }

    public static class BranchOp extends PTXLIRInstruction implements StandardOp.BranchOp {

        protected Condition condition;
        protected LabelRef destination;

        public BranchOp(Condition condition, LabelRef destination) {
            this.condition = condition;
            this.destination = destination;
        }

        @Override
        public void emitCode(TargetMethodAssembler tasm, PTXAssembler masm) {
            masm.at();
            Label l = destination.label();
            l.addPatchAt(tasm.asm.codeBuffer.position());
            String target = l.isBound() ? "L" + l.toString() : AbstractPTXAssembler.UNBOUND_TARGET;
            masm.bra(target);
        }

        @Override
        public LabelRef destination() {
            return destination;
        }

        @Override
        public void negate(LabelRef newDestination) {
            destination = newDestination;
            condition = condition.negate();
        }
    }
    
    public static class CondMoveOp extends PTXLIRInstruction {
        @Def({REG, HINT}) protected Value result;
        @Alive({REG}) protected Value trueValue;
        @Use({REG, STACK, CONST}) protected Value falseValue;
        private final Condition condition;

        public CondMoveOp(Variable result, Condition condition, Variable trueValue, Value falseValue) {
            this.result = result;
            this.condition = condition;
            this.trueValue = trueValue;
            this.falseValue = falseValue;
        }

        @Override
        public void emitCode(TargetMethodAssembler tasm, PTXAssembler masm) {
            // cmove(tasm, masm, result, false, condition, false, trueValue, falseValue);
        	// see 8.3 Predicated Execution p. 61 of PTX ISA 3.1
            throw new InternalError("NYI");
        }
    }


    public static class FloatCondMoveOp extends PTXLIRInstruction {
        @Def({REG}) protected Value result;
        @Alive({REG}) protected Value trueValue;
        @Alive({REG}) protected Value falseValue;
        private final Condition condition;
        private final boolean unorderedIsTrue;

        public FloatCondMoveOp(Variable result, Condition condition, boolean unorderedIsTrue, Variable trueValue, Variable falseValue) {
            this.result = result;
            this.condition = condition;
            this.unorderedIsTrue = unorderedIsTrue;
            this.trueValue = trueValue;
            this.falseValue = falseValue;
        }

        @Override
        public void emitCode(TargetMethodAssembler tasm, PTXAssembler masm) {
            // cmove(tasm, masm, result, true, condition, unorderedIsTrue, trueValue, falseValue);
            // see 8.3 Predicated Execution p. 61 of PTX ISA 3.1
            throw new InternalError("NYI");
        }
    }
}