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package com.oracle.truffle.js.nodes.binary;

import java.util.Objects;
import java.util.Set;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.instrumentation.InstrumentableNode;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode;
import com.oracle.truffle.js.nodes.access.JSConstantNode.JSConstantIntegerNode;
import com.oracle.truffle.js.nodes.cast.JSToNumericNode;
import com.oracle.truffle.js.nodes.cast.JSToUInt32Node;
import com.oracle.truffle.js.nodes.cast.JSToUInt32Node.JSToUInt32WrapperNode;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.BinaryOperationTag;
import com.oracle.truffle.js.nodes.unary.JSUnaryNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.SafeInteger;

11.7.3 The Unsigned Right Shift Operator (>>>).
/** * 11.7.3 The Unsigned Right Shift Operator (>>>). */
@NodeInfo(shortName = ">>>") public abstract class JSUnsignedRightShiftConstantNode extends JSUnaryNode { protected final int shiftValue; protected final int rightValue; protected JSUnsignedRightShiftConstantNode(JavaScriptNode operand, int shiftValue, int rightValue) { super(operand); assert shiftValue > 0; this.shiftValue = shiftValue; this.rightValue = rightValue; } public abstract int executeInt(Object a); public static JavaScriptNode create(JavaScriptNode left, JavaScriptNode right) { assert right instanceof JSConstantIntegerNode; int rightValue = ((JSConstantIntegerNode) right).executeInt(null); int shiftValue = rightValue & 0x1F; if (shiftValue == 0) { return JSToUInt32WrapperNode.create(left); } if (left instanceof JSConstantIntegerNode) { int leftValue = ((JSConstantIntegerNode) left).executeInt(null); return JSConstantNode.createInt(leftValue >>> shiftValue); } return JSUnsignedRightShiftConstantNodeGen.create(left, shiftValue, rightValue); } @Override public boolean hasTag(Class<? extends Tag> tag) { if (tag == BinaryOperationTag.class) { return true; } else { return super.hasTag(tag); } } @Override public InstrumentableNode materializeInstrumentableNodes(Set<Class<? extends Tag>> materializedTags) { if (materializedTags.contains(BinaryOperationTag.class)) { // need to call the generated factory directly to avoid constant optimizations JSConstantNode constantNode = JSConstantNode.createInt(rightValue); JavaScriptNode node = JSUnsignedRightShiftNodeGen.create(cloneUninitialized(getOperand(), materializedTags), constantNode); transferSourceSectionAddExpressionTag(this, constantNode); transferSourceSectionAndTags(this, node); return node; } else { return this; } } @Specialization protected int doInteger(int a) { return a >>> shiftValue; } @Specialization protected int doSafeInteger(SafeInteger a) { return a.intValue() >>> shiftValue; } @Specialization protected int doDouble(double a, @Cached("create()") JSToUInt32Node toUInt32Node) { assert shiftValue > 0; return (int) (toUInt32Node.executeLong(a) >>> shiftValue); } @Specialization protected int doBigInt(@SuppressWarnings("unused") BigInt a) { throw Errors.createTypeErrorCannotMixBigIntWithOtherTypes(this); } @Specialization(guards = "!isHandled(lval)") protected int doGeneric(Object lval, @Cached("create()") JSToNumericNode leftToNumeric, @Cached("createInner()") JSUnsignedRightShiftConstantNode innerShiftNode) { Object leftOperand = leftToNumeric.execute(lval); return innerShiftNode.executeInt(leftOperand); } protected static boolean isHandled(Object lval) { return lval instanceof Integer || lval instanceof Double || lval instanceof SafeInteger || lval instanceof BigInt; } @Override public boolean isResultAlwaysOfType(Class<?> clazz) { return clazz == int.class; } protected JSUnsignedRightShiftConstantNode createInner() { return JSUnsignedRightShiftConstantNodeGen.create(null, shiftValue, rightValue); } @Override protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) { return JSUnsignedRightShiftConstantNodeGen.create(cloneUninitialized(getOperand(), materializedTags), shiftValue, rightValue); } @Override public String expressionToString() { if (getOperand() != null) { return "(" + Objects.toString(getOperand().expressionToString(), INTERMEDIATE_VALUE) + " >>> " + rightValue + ")"; } return null; } }