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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
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 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package org.graalvm.wasm.nodes;

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.HostCompilerDirectives.BytecodeInterpreterSwitchBoundary;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.profiles.ConditionProfile;
import org.graalvm.wasm.WasmCodeEntry;
import org.graalvm.wasm.WasmContext;
import org.graalvm.wasm.WasmInstance;

public final class WasmIfNode extends WasmNode {

    @CompilationFinal private final byte returnTypeId;
    @CompilationFinal private final int initialStackPointer;
    @Child private WasmBlockNode trueBranch;
    @Child private WasmBlockNode falseBranch;

    private final ConditionProfile condition = ConditionProfile.createCountingProfile();

    public WasmIfNode(WasmInstance wasmInstance, WasmCodeEntry codeEntry, WasmBlockNode trueBranch, WasmBlockNode falseBranch, int byteLength, byte returnTypeId, int initialStackPointer) {
        super(wasmInstance, codeEntry, byteLength);
        this.returnTypeId = returnTypeId;
        this.initialStackPointer = initialStackPointer;
        this.trueBranch = trueBranch;
        this.falseBranch = falseBranch;
    }

    @BytecodeInterpreterSwitchBoundary
    @Override
    public int execute(WasmContext context, VirtualFrame frame, long[] stacklocals) {
        int stackPointer = initialStackPointer - 1;
        if (condition.profile(popInt(stacklocals, codeEntry().numLocals() + stackPointer) != 0)) {
            return trueBranch.execute(context, frame, stacklocals);
        } else if (falseBranch != null) {
            return falseBranch.execute(context, frame, stacklocals);
        } else {
            return -1;
        }
    }

    @Override
    public byte returnTypeId() {
        return returnTypeId;
    }

    @Override
    int intConstantLength() {
        return trueBranch.intConstantLength() + (falseBranch != null ? falseBranch.intConstantLength() : 0);
    }

    @Override
    int branchTableLength() {
        return trueBranch.branchTableLength() + (falseBranch != null ? falseBranch.branchTableLength() : 0);
    }

    @Override
    int profileCount() {
        return trueBranch.profileCount() + (falseBranch != null ? falseBranch.profileCount() : 0);
    }
}