Java Code Examples for org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants#JDK1_4

public final ReferenceBinding findLocalType(char[] name) {
	long compliance = compilerOptions().complianceLevel;
	for (int i = this.subscopeCount-1; i >= 0; i--) {
		if (this.subscopes[i] instanceof ClassScope) {
			LocalTypeBinding sourceType = (LocalTypeBinding)((ClassScope) this.subscopes[i]).referenceContext.binding;
			// from 1.4 on, local types should not be accessed across switch case blocks (52221)
			if (compliance >= ClassFileConstants.JDK1_4 && sourceType.enclosingCase != null) {
				if (!isInsideCase(sourceType.enclosingCase)) {
					continue;
				}
			}
			if (CharOperation.equals(sourceType.sourceName(), name))
				return sourceType;
		}
	}
	return null;
}
 

private Binding findSingleImport(char[][] compoundName, int mask, boolean findStaticImports) {
	if (compoundName.length == 1) {
		// findType records the reference
		// the name cannot be a package
		if (compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
			return new ProblemReferenceBinding(compoundName, null, ProblemReasons.NotFound);
		ReferenceBinding typeBinding = findType(compoundName[0], this.environment.defaultPackage, this.fPackage);
		if (typeBinding == null)
			return new ProblemReferenceBinding(compoundName, null, ProblemReasons.NotFound);
		return typeBinding;
	}

	if (findStaticImports)
		return findSingleStaticImport(compoundName, mask);
	return findImport(compoundName, compoundName.length);
}
 

public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
	if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return;
	// if constructor from parameterized type got found, use the original constructor at codegen time
	MethodBinding codegenBinding = this.binding.original();

	ReferenceBinding declaringClass;
	if (codegenBinding.isPrivate() && TypeBinding.notEquals(currentScope.enclosingSourceType(), (declaringClass = codegenBinding.declaringClass))) {

		// from 1.4 on, local type constructor can lose their private flag to ease emulation
		if ((declaringClass.tagBits & TagBits.IsLocalType) != 0 && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
			// constructor will not be dumped as private, no emulation required thus
			codegenBinding.tagBits |= TagBits.ClearPrivateModifier;
		} else {
			this.syntheticAccessor = ((SourceTypeBinding) declaringClass).addSyntheticMethod(codegenBinding, isSuperAccess());
			currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
		}
	}
}
 

public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
	if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0)	{
		// if constructor from parameterized type got found, use the original constructor at codegen time
		MethodBinding codegenBinding = this.binding.original();

		// perform some emulation work in case there is some and we are inside a local type only
		if (this.binding.isPrivate() && this.accessMode != ExplicitConstructorCall.This) {
			ReferenceBinding declaringClass = codegenBinding.declaringClass;
			// from 1.4 on, local type constructor can lose their private flag to ease emulation
			if ((declaringClass.tagBits & TagBits.IsLocalType) != 0 && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
				// constructor will not be dumped as private, no emulation required thus
				codegenBinding.tagBits |= TagBits.ClearPrivateModifier;
			} else {
				this.syntheticAccessor = ((SourceTypeBinding) declaringClass).addSyntheticMethod(codegenBinding, isSuperAccess());
				currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this);
			}
		}
	}
}
 

public int complainIfUnreachable(FlowInfo flowInfo, BlockScope scope, int complaintLevel, boolean endOfBlock) {
	// before 1.4, empty statements are tolerated anywhere
	if (scope.compilerOptions().complianceLevel < ClassFileConstants.JDK1_4) {
		return complaintLevel;
	}
	return super.complainIfUnreachable(flowInfo, scope, complaintLevel, endOfBlock);
}
 

public static long versionToJdkLevel(Object versionID) {
	if (versionID instanceof String) {
		String version = (String) versionID;
		// verification is optimized for all versions with same length and same "1." prefix
		if (version.length() == 3 && version.charAt(0) == '1' && version.charAt(1) == '.') {
			switch (version.charAt(2)) {
				case '1':
					return ClassFileConstants.JDK1_1;
				case '2':
					return ClassFileConstants.JDK1_2;
				case '3':
					return ClassFileConstants.JDK1_3;
				case '4':
					return ClassFileConstants.JDK1_4;
				case '5':
					return ClassFileConstants.JDK1_5;
				case '6':
					return ClassFileConstants.JDK1_6;
				case '7':
					return ClassFileConstants.JDK1_7;
				case '8':
					return ClassFileConstants.JDK1_8;
				default:
					return 0; // unknown
			}
		}
		if (VERSION_JSR14.equals(versionID)) {
			return ClassFileConstants.JDK1_4;
		}
		if (VERSION_CLDC1_1.equals(versionID)) {
			return ClassFileConstants.CLDC_1_1;
		}
	}
	return 0; // unknown
}
 

public static String versionFromJdkLevel(long jdkLevel) {
	switch ((int)(jdkLevel>>16)) {
		case ClassFileConstants.MAJOR_VERSION_1_1 :
			if (jdkLevel == ClassFileConstants.JDK1_1)
				return VERSION_1_1;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_2 :
			if (jdkLevel == ClassFileConstants.JDK1_2)
				return VERSION_1_2;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_3 :
			if (jdkLevel == ClassFileConstants.JDK1_3)
				return VERSION_1_3;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_4 :
			if (jdkLevel == ClassFileConstants.JDK1_4)
				return VERSION_1_4;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_5 :
			if (jdkLevel == ClassFileConstants.JDK1_5)
				return VERSION_1_5;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_6 :
			if (jdkLevel == ClassFileConstants.JDK1_6)
				return VERSION_1_6;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_7 :
			if (jdkLevel == ClassFileConstants.JDK1_7)
				return VERSION_1_7;
			break;
		case ClassFileConstants.MAJOR_VERSION_1_8 :
			if (jdkLevel == ClassFileConstants.JDK1_8)
				return VERSION_1_8;
			break;
	}
	return Util.EMPTY_STRING; // unknown version
}
 

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, boolean valueRequired) {
	boolean nonStatic = !this.binding.isStatic();
	this.receiver.analyseCode(currentScope, flowContext, flowInfo, nonStatic);
	if (nonStatic) {
		this.receiver.checkNPE(currentScope, flowContext, flowInfo);
	}

	if (valueRequired || currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
		manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
	}
	return flowInfo;
}
 

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, boolean valueRequired) {
	switch (this.bits & ASTNode.RestrictiveFlagMASK) {
		case Binding.FIELD : // reading a field
			if (valueRequired || currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
				manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
			}
			// check if reading a final blank field
			FieldBinding fieldBinding = (FieldBinding) this.binding;
			if (fieldBinding.isBlankFinal() && currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
				FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
				if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
					currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
				}
			}
			break;
		case Binding.LOCAL : // reading a local variable
			LocalVariableBinding localBinding;
			if (!flowInfo.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
				currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
			}
			if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
				localBinding.useFlag = LocalVariableBinding.USED;
			} else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
				localBinding.useFlag = LocalVariableBinding.FAKE_USED;
			}
	}
	if (valueRequired) {
		manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
	}
	return flowInfo;
}
 

/**
 * Creates a new, empty abstract syntax tree using the given options.
 * <p>
 * Following option keys are significant:
 * <ul>
 * <li><code>"org.eclipse.jdt.core.compiler.source"</code> -
 *    indicates source compatibility mode (as per <code>JavaCore</code>);
 *    <code>"1.3"</code> means the source code is as per JDK 1.3;
 *    <code>"1.4"</code> means the source code is as per JDK 1.4
 *    (<code>"assert"</code> is now a keyword);
 *    <code>"1.5"</code> means the source code is as per JDK 1.5
 *    (<code>"enum"</code> is now a keyword);
 *    <code>"1.7"</code> means the source code is as per JDK 1.7;
 *    additional legal values may be added later. </li>
 * </ul>
 * Options other than the above are ignored.
 * </p>
 *
 * @param options the table of options (key type: <code>String</code>;
 *    value type: <code>String</code>)
 * @see JavaCore#getDefaultOptions()
 * @deprecated Clients should port their code to use the new JLS4 AST API and call
 *    {@link #newAST(int) AST.newAST(AST.JLS4)} instead of using this constructor.
 */
public AST(Map options) {
	this(JLS2);
	Object sourceLevelOption = options.get(JavaCore.COMPILER_SOURCE);
	long sourceLevel = ClassFileConstants.JDK1_3;
	if (JavaCore.VERSION_1_4.equals(sourceLevelOption)) {
		sourceLevel = ClassFileConstants.JDK1_4;
	} else if (JavaCore.VERSION_1_5.equals(sourceLevelOption)) {
		sourceLevel = ClassFileConstants.JDK1_5;
	} else if (JavaCore.VERSION_1_7.equals(sourceLevelOption)) {
		sourceLevel = ClassFileConstants.JDK1_7;
	}
	Object complianceLevelOption = options.get(JavaCore.COMPILER_COMPLIANCE);
	long complianceLevel = ClassFileConstants.JDK1_3;
	if (JavaCore.VERSION_1_4.equals(complianceLevelOption)) {
		complianceLevel = ClassFileConstants.JDK1_4;
	} else if (JavaCore.VERSION_1_5.equals(complianceLevelOption)) {
		complianceLevel = ClassFileConstants.JDK1_5;
	} else if (JavaCore.VERSION_1_7.equals(complianceLevelOption)) {
		complianceLevel = ClassFileConstants.JDK1_7;
	}
	// override scanner if 1.4 or 1.5 asked for
	this.scanner = new Scanner(
		true /*comment*/,
		true /*whitespace*/,
		false /*nls*/,
		sourceLevel /*sourceLevel*/,
		complianceLevel /*complianceLevel*/,
		null/*taskTag*/,
		null/*taskPriorities*/,
		true/*taskCaseSensitive*/);
}
 

/**
 * Create a scanner, indicating the level of detail requested for tokenizing. The scanner can then be
 * used to tokenize some source in a Java aware way.
 * Here is a typical scanning loop:
 *
 * <code>
 * <pre>
 *   IScanner scanner = ToolFactory.createScanner(false, false, false, false);
 *   scanner.setSource("int i = 0;".toCharArray());
 *   while (true) {
 *     int token = scanner.getNextToken();
 *     if (token == ITerminalSymbols.TokenNameEOF) break;
 *     System.out.println(token + " : " + new String(scanner.getCurrentTokenSource()));
 *   }
 * </pre>
 * </code>
 *
 * <p>By default the compliance used to create the scanner is the workspace's compliance when running inside the IDE
 * or 1.4 if running from outside of a headless eclipse.
 * </p>
 *
 * @param tokenizeComments if set to <code>false</code>, comments will be silently consumed
 * @param tokenizeWhiteSpace if set to <code>false</code>, white spaces will be silently consumed,
 * @param assertMode if set to <code>false</code>, occurrences of 'assert' will be reported as identifiers
 * ({@link ITerminalSymbols#TokenNameIdentifier}), whereas if set to <code>true</code>, it
 * would report assert keywords ({@link ITerminalSymbols#TokenNameassert}). Java 1.4 has introduced
 * a new 'assert' keyword.
 * @param recordLineSeparator if set to <code>true</code>, the scanner will record positions of encountered line
 * separator ends. In case of multi-character line separators, the last character position is considered. These positions
 * can then be extracted using {@link IScanner#getLineEnds()}. Only non-unicode escape sequences are
 * considered as valid line separators.
 	 * @return a scanner
 * @see org.eclipse.jdt.core.compiler.IScanner
 * @see #createScanner(boolean, boolean, boolean, String, String)
 */
public static IScanner createScanner(boolean tokenizeComments, boolean tokenizeWhiteSpace, boolean assertMode, boolean recordLineSeparator){
	// use default workspace compliance
	long complianceLevelValue = CompilerOptions.versionToJdkLevel(JavaCore.getOption(JavaCore.COMPILER_COMPLIANCE));
	if (complianceLevelValue == 0) complianceLevelValue = ClassFileConstants.JDK1_4; // fault-tolerance
	PublicScanner scanner =
		new PublicScanner(
			tokenizeComments,
			tokenizeWhiteSpace,
			false/*nls*/,
			assertMode ? ClassFileConstants.JDK1_4 : ClassFileConstants.JDK1_3/*sourceLevel*/,
			complianceLevelValue,
			null/*taskTags*/,
			null/*taskPriorities*/,
			true/*taskCaseSensitive*/);
	scanner.recordLineSeparator = recordLineSeparator;
	return scanner;
}
 

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, boolean valueRequired) {
	// determine the rank until which we now we do not need any actual value for the field access
	int otherBindingsCount = this.otherBindings == null ? 0 : this.otherBindings.length;

	boolean needValue = otherBindingsCount == 0 ? valueRequired : !this.otherBindings[0].isStatic();
	boolean complyTo14 = currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4;
	switch (this.bits & ASTNode.RestrictiveFlagMASK) {
		case Binding.FIELD : // reading a field
			if (needValue || complyTo14) {
				manageSyntheticAccessIfNecessary(currentScope, (FieldBinding) this.binding, 0, flowInfo);
			}
			FieldBinding fieldBinding = (FieldBinding) this.binding;
			if (this.indexOfFirstFieldBinding == 1) { // was an implicit reference to the first field binding
				// check if reading a final blank field
				if (fieldBinding.isBlankFinal()
						&& currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
					FlowInfo fieldInits = flowContext.getInitsForFinalBlankInitializationCheck(fieldBinding.declaringClass.original(), flowInfo);
					if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
						currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
					}
				}
			}
			break;
		case Binding.LOCAL : // reading a local variable
			LocalVariableBinding localBinding;
			if (!flowInfo.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
				currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
			}
			if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
				localBinding.useFlag = LocalVariableBinding.USED;
			} else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
				localBinding.useFlag = LocalVariableBinding.FAKE_USED;
			}
	}
	if (needValue) {
		checkInternalNPE(currentScope, flowContext, flowInfo, true);
	}
	if (needValue) {
		manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
		// only for first binding (if value needed only)
	}
	if (this.otherBindings != null) {
		for (int i = 0; i < otherBindingsCount; i++) {
			needValue = i < otherBindingsCount-1 ? !this.otherBindings[i+1].isStatic() : valueRequired;
			if (needValue || complyTo14) {
				manageSyntheticAccessIfNecessary(currentScope, this.otherBindings[i], i + 1, flowInfo);
			}
		}
	}
	return flowInfo;
}
 

public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
	int pc = codeStream.position;
	if (this.constant != Constant.NotAConstant) {
		if (valueRequired) {
			codeStream.generateConstant(this.constant, this.implicitConversion);
		}
	} else {
		FieldBinding lastFieldBinding = generateReadSequence(currentScope, codeStream);
		if (lastFieldBinding != null) {
			boolean isStatic = lastFieldBinding.isStatic();
			Constant fieldConstant = lastFieldBinding.constant();
			if (fieldConstant != Constant.NotAConstant) {
				if (!isStatic){
					codeStream.invokeObjectGetClass();
					codeStream.pop();
				}
				if (valueRequired) { // inline the last field constant
					codeStream.generateConstant(fieldConstant, this.implicitConversion);
				}
			} else {
				boolean isFirst = lastFieldBinding == this.binding
												&& (this.indexOfFirstFieldBinding == 1 || TypeBinding.equalsEquals(lastFieldBinding.declaringClass, currentScope.enclosingReceiverType()))
												&& this.otherBindings == null; // could be dup: next.next.next
				TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
				if (valueRequired
						|| (!isFirst && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
						|| ((this.implicitConversion & TypeIds.UNBOXING) != 0)
						|| requiredGenericCast != null) {
					int lastFieldPc = codeStream.position;
					if (lastFieldBinding.declaringClass == null) { // array length
						codeStream.arraylength();
						if (valueRequired) {
							codeStream.generateImplicitConversion(this.implicitConversion);
						} else {
							// could occur if !valueRequired but compliance >= 1.4
							codeStream.pop();
						}
					} else {
						SyntheticMethodBinding accessor = this.syntheticReadAccessors == null ? null : this.syntheticReadAccessors[this.syntheticReadAccessors.length - 1];
						if (accessor == null) {
							TypeBinding constantPoolDeclaringClass = CodeStream.getConstantPoolDeclaringClass(currentScope, lastFieldBinding, getFinalReceiverType(), isFirst);
							if (isStatic) {
								codeStream.fieldAccess(Opcodes.OPC_getstatic, lastFieldBinding, constantPoolDeclaringClass);
							} else {
								codeStream.fieldAccess(Opcodes.OPC_getfield, lastFieldBinding, constantPoolDeclaringClass);
							}
						} else {
							codeStream.invoke(Opcodes.OPC_invokestatic, accessor, null /* default declaringClass */);
						}
						if (requiredGenericCast != null) codeStream.checkcast(requiredGenericCast);
						if (valueRequired) {
							codeStream.generateImplicitConversion(this.implicitConversion);
						} else {
							boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
							// conversion only generated if unboxing
							if (isUnboxing) codeStream.generateImplicitConversion(this.implicitConversion);
							switch (isUnboxing ? postConversionType(currentScope).id : lastFieldBinding.type.id) {
								case T_long :
								case T_double :
									codeStream.pop2();
									break;
								default :
									codeStream.pop();
									break;
							}
						}
					}

					int fieldPosition = (int) (this.sourcePositions[this.sourcePositions.length - 1] >>> 32);
					codeStream.recordPositionsFrom(lastFieldPc, fieldPosition);
				} else {
					if (!isStatic){
						codeStream.invokeObjectGetClass(); // perform null check
						codeStream.pop();
					}
				}
			}
		}
	}
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}
 

private Binding findImport(char[][] compoundName, int length) {
	recordQualifiedReference(compoundName);

	Binding binding = this.environment.getTopLevelPackage(compoundName[0]);
	int i = 1;
	foundNothingOrType: if (binding != null) {
		PackageBinding packageBinding = (PackageBinding) binding;
		while (i < length) {
			binding = packageBinding.getTypeOrPackage(compoundName[i++]);
			if (binding == null || !binding.isValidBinding()) {
				binding = null;
				break foundNothingOrType;
			}
			if (!(binding instanceof PackageBinding))
				break foundNothingOrType;

			packageBinding = (PackageBinding) binding;
		}
		return packageBinding;
	}

	ReferenceBinding type;
	if (binding == null) {
		if (compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
			return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), null, ProblemReasons.NotFound);
		type = findType(compoundName[0], this.environment.defaultPackage, this.environment.defaultPackage);
		if (type == null || !type.isValidBinding())
			return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), null, ProblemReasons.NotFound);
		i = 1; // reset to look for member types inside the default package type
	} else {
		type = (ReferenceBinding) binding;
	}

	while (i < length) {
		type = (ReferenceBinding)this.environment.convertToRawType(type, false /*do not force conversion of enclosing types*/); // type imports are necessarily raw for all except last
		if (!type.canBeSeenBy(this.fPackage))
			return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), type, ProblemReasons.NotVisible);

		char[] name = compoundName[i++];
		// does not look for inherited member types on purpose, only immediate members
		type = type.getMemberType(name);
		if (type == null)
			return new ProblemReferenceBinding(CharOperation.subarray(compoundName, 0, i), null, ProblemReasons.NotFound);
	}
	if (!type.canBeSeenBy(this.fPackage))
		return new ProblemReferenceBinding(compoundName, type, ProblemReasons.NotVisible);
	return type;
}
 

/**
 * Return true if and only if the running VM supports the given minimal version.
 *
 * <p>This only checks the major version, since the minor version is always 0 (at least for the useful cases).</p>
 * <p>The given minimalSupportedVersion is one of the constants:</p>
 * <ul>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_1</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_2</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_3</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_4</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_5</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_6</code></li>
 * <li><code>org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.JDK1_7</code></li>
 * </ul>
 * @param minimalSupportedVersion the given minimal version
 * @return true if and only if the running VM supports the given minimal version, false otherwise
 */
private boolean checkVMVersion(long minimalSupportedVersion) {
	// the format of this property is supposed to be xx.x where x are digits.
	String classFileVersion = System.getProperty("java.class.version"); //$NON-NLS-1$
	if (classFileVersion == null) {
		// by default we don't support a class file version we cannot recognize
		return false;
	}
	int index = classFileVersion.indexOf('.');
	if (index == -1) {
		// by default we don't support a class file version we cannot recognize
		return false;
	}
	int majorVersion;
	try {
		majorVersion = Integer.parseInt(classFileVersion.substring(0, index));
	} catch (NumberFormatException e) {
		// by default we don't support a class file version we cannot recognize
		return false;
	}
	switch(majorVersion) {
		case ClassFileConstants.MAJOR_VERSION_1_1 : // 1.0 and 1.1
			return ClassFileConstants.JDK1_1 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_2 : // 1.2
			return ClassFileConstants.JDK1_2 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_3 : // 1.3
			return ClassFileConstants.JDK1_3 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_4 : // 1.4
			return ClassFileConstants.JDK1_4 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_5 : // 1.5
			return ClassFileConstants.JDK1_5 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_6 : // 1.6
			return ClassFileConstants.JDK1_6 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_7 : // 1.7
			return ClassFileConstants.JDK1_7 >= minimalSupportedVersion;
		case ClassFileConstants.MAJOR_VERSION_1_8: // 1.8
			return ClassFileConstants.JDK1_8 >= minimalSupportedVersion;
	}
	// unknown version
	return false;
}
 

public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
	int pc = codeStream.position;
	if ((this.bits & Binding.VARIABLE) == 0) { // nothing to do if type ref
		codeStream.recordPositionsFrom(pc, this.sourceStart);
		return;
	}
	FieldBinding lastFieldBinding = this.otherBindings == null ? (FieldBinding) this.binding : this.otherBindings[this.otherBindings.length-1];
	if (lastFieldBinding.canBeSeenBy(getFinalReceiverType(), this, currentScope)) {
		super.generateCode(currentScope, codeStream, valueRequired);
		return;
	}
	lastFieldBinding = generateReadSequence(currentScope, codeStream);
	if (lastFieldBinding != null) {
		boolean isStatic = lastFieldBinding.isStatic();
		Constant fieldConstant = lastFieldBinding.constant();
		if (fieldConstant != Constant.NotAConstant) {
			if (!isStatic){
				codeStream.invokeObjectGetClass();
				codeStream.pop();
			}
			if (valueRequired) { // inline the last field constant
				codeStream.generateConstant(fieldConstant, this.implicitConversion);
			}
		} else {
			boolean isFirst = lastFieldBinding == this.binding
											&& (this.indexOfFirstFieldBinding == 1 || TypeBinding.equalsEquals(lastFieldBinding.declaringClass, currentScope.enclosingReceiverType()))
											&& this.otherBindings == null; // could be dup: next.next.next
			TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
			if (valueRequired
					|| (!isFirst && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4)
					|| ((this.implicitConversion & TypeIds.UNBOXING) != 0)
					|| requiredGenericCast != null) {
				int lastFieldPc = codeStream.position;
				if (lastFieldBinding.declaringClass == null) { // array length
					codeStream.arraylength();
					if (valueRequired) {
						codeStream.generateImplicitConversion(this.implicitConversion);
					} else {
						// could occur if !valueRequired but compliance >= 1.4
						codeStream.pop();
					}
				} else {
					codeStream.generateEmulatedReadAccessForField(lastFieldBinding);
					if (requiredGenericCast != null) codeStream.checkcast(requiredGenericCast);
					if (valueRequired) {
						codeStream.generateImplicitConversion(this.implicitConversion);
					} else {
						boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
						// conversion only generated if unboxing
						if (isUnboxing) codeStream.generateImplicitConversion(this.implicitConversion);
						switch (isUnboxing ? postConversionType(currentScope).id : lastFieldBinding.type.id) {
							case T_long :
							case T_double :
								codeStream.pop2();
								break;
							default :
								codeStream.pop();
						}
					}
				}

				int fieldPosition = (int) (this.sourcePositions[this.sourcePositions.length - 1] >>> 32);
				codeStream.recordPositionsFrom(lastFieldPc, fieldPosition);
			} else {
				if (!isStatic){
					codeStream.invokeObjectGetClass(); // perform null check
					codeStream.pop();
				}
			}
		}
	}
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}
 

/**
 * Create a scanner, indicating the level of detail requested for tokenizing. The scanner can then be
 * used to tokenize some source in a Java aware way.
 * Here is a typical scanning loop:
 *
 * <code>
 * <pre>
 *   IScanner scanner = ToolFactory.createScanner(false, false, false, false);
 *   scanner.setSource("int i = 0;".toCharArray());
 *   while (true) {
 *     int token = scanner.getNextToken();
 *     if (token == ITerminalSymbols.TokenNameEOF) break;
 *     System.out.println(token + " : " + new String(scanner.getCurrentTokenSource()));
 *   }
 * </pre>
 * </code>
 *
 * <p>By default the compliance used to create the scanner is the workspace's compliance when running inside the IDE
 * or 1.4 if running from outside of a headless eclipse.
 * </p>
 *
 * @param tokenizeComments if set to <code>false</code>, comments will be silently consumed
 * @param tokenizeWhiteSpace if set to <code>false</code>, white spaces will be silently consumed,
 * @param recordLineSeparator if set to <code>true</code>, the scanner will record positions of encountered line
 * separator ends. In case of multi-character line separators, the last character position is considered. These positions
 * can then be extracted using {@link IScanner#getLineEnds()}. Only non-unicode escape sequences are
 * considered as valid line separators.
 * @param sourceLevel if set to <code>&quot;1.3&quot;</code> or <code>null</code>, occurrences of 'assert' will be reported as identifiers
 * ({@link ITerminalSymbols#TokenNameIdentifier}), whereas if set to <code>&quot;1.4&quot;</code>, it
 * would report assert keywords ({@link ITerminalSymbols#TokenNameassert}). Java 1.4 has introduced
 * a new 'assert' keyword.
 * @return a scanner
 * @see org.eclipse.jdt.core.compiler.IScanner
 * @see #createScanner(boolean, boolean, boolean, String, String)
 * @since 3.0
 */
public static IScanner createScanner(boolean tokenizeComments, boolean tokenizeWhiteSpace, boolean recordLineSeparator, String sourceLevel) {
	// use default workspace compliance
	long complianceLevelValue = CompilerOptions.versionToJdkLevel(JavaCore.getOption(JavaCore.COMPILER_COMPLIANCE));
	if (complianceLevelValue == 0) complianceLevelValue = ClassFileConstants.JDK1_4; // fault-tolerance
	long sourceLevelValue = CompilerOptions.versionToJdkLevel(sourceLevel);
	if (sourceLevelValue == 0) sourceLevelValue = ClassFileConstants.JDK1_3; // fault-tolerance
	PublicScanner scanner =
		new PublicScanner(
			tokenizeComments,
			tokenizeWhiteSpace,
			false/*nls*/,
			sourceLevelValue /*sourceLevel*/,
			complianceLevelValue,
			null/*taskTags*/,
			null/*taskPriorities*/,
			true/*taskCaseSensitive*/);
	scanner.recordLineSeparator = recordLineSeparator;
	return scanner;
}