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/*
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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
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 * Subject to the condition set forth below, permission is hereby granted to any
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.sl.nodes.expression;

import static com.oracle.truffle.api.CompilerDirectives.shouldNotReachHere;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.nodes.SLBinaryNode;
import com.oracle.truffle.sl.runtime.SLBigInteger;
import com.oracle.truffle.sl.runtime.SLFunction;
import com.oracle.truffle.sl.runtime.SLNull;

/**
 * The {@code ==} operator of SL is defined on all types. Therefore, we need a
 * {@link #doGeneric(Object, Object, InteropLibrary, InteropLibrary) implementation} that can handle
 * all possible types including interop types.
 * 

* Note that we do not need the analogous {@code !=} operator, because we can just * {@link SLLogicalNotNode negate} the {@code ==} operator. */ @NodeInfo(shortName = "==") public abstract class SLEqualNode extends SLBinaryNode { @Specialization protected boolean doLong(long left, long right) { return left == right; } @Specialization @TruffleBoundary protected boolean doBigNumber(SLBigInteger left, SLBigInteger right) { return left.equals(right); } @Specialization protected boolean doBoolean(boolean left, boolean right) { return left == right; } @Specialization protected boolean doString(String left, String right) { return left.equals(right); } @Specialization protected boolean doTruffleString(TruffleString left, TruffleString right, @Cached TruffleString.EqualNode equalNode) { return equalNode.execute(left, right, SLLanguage.STRING_ENCODING); } @Specialization protected boolean doNull(SLNull left, SLNull right) { /* There is only the singleton instance of SLNull, so we do not need equals(). */ return left == right; } @Specialization protected boolean doFunction(SLFunction left, Object right) { /* * Our function registry maintains one canonical SLFunction object per function name, so we * do not need equals(). */ return left == right; } /* * This is a generic specialization of equality operation. Since it is generic this * specialization covers the entire semantics. One can see this by having no method guards set * and the types for the left and right value are Object. The previous specializations are only * here for interpreter performance and footprint reasons. They could be removed and this * operation be semantically equivalent. * * We cache four combinations of interop values until we fallback to the uncached version of * this specialization. This limit is set arbitrary and for a real language should be set to the * minimal possible value, for a set of given benchmarks. * * This specialization is generic and handles all the cases, but in this case we decided to not * replace the previous specializations, as they are still more efficient in the interpeter. */ @Specialization(limit = "4") public boolean doGeneric(Object left, Object right, @CachedLibrary("left") InteropLibrary leftInterop, @CachedLibrary("right") InteropLibrary rightInterop) { /* * This method looks very inefficient. In practice most of these branches fold as the * interop type checks typically return a constant when using a cached library. * * Exercise: Try looking at what happens to this method during partial evaluation in IGV. * Tip: comment out all the previous @Specialization annotations to make it easier to * activate this specialization. */ try { if (leftInterop.isBoolean(left) && rightInterop.isBoolean(right)) { return doBoolean(leftInterop.asBoolean(left), rightInterop.asBoolean(right)); } else if (leftInterop.isString(left) && rightInterop.isString(right)) { return doString(leftInterop.asString(left), (rightInterop.asString(right))); } else if (leftInterop.isNull(left) && rightInterop.isNull(right)) { return true; } else if (leftInterop.fitsInLong(left) && rightInterop.fitsInLong(right)) { return doLong(leftInterop.asLong(left), (rightInterop.asLong(right))); } else if (left instanceof SLBigInteger && right instanceof SLBigInteger) { return doBigNumber((SLBigInteger) left, (SLBigInteger) right); } else if (leftInterop.hasIdentity(left) && rightInterop.hasIdentity(right)) { return leftInterop.isIdentical(left, right, rightInterop); } else { /* * We return false in good dynamic language manner. Stricter languages might throw * an error here. */ return false; } } catch (UnsupportedMessageException e) { // this case must not happen as we always check interop types before converting throw shouldNotReachHere(e); } } }





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