Java TypeBinding.VOID属性代码示例

private TypeBinding getBaseTypeBinding(char[] signature) {
	switch (signature[0]) {
		case 'I' :
			return TypeBinding.INT;
		case 'Z' :
			return TypeBinding.BOOLEAN;
		case 'V' :
			return TypeBinding.VOID;
		case 'C' :
			return TypeBinding.CHAR;
		case 'D' :
			return TypeBinding.DOUBLE;
		case 'B' :
			return TypeBinding.BYTE;
		case 'F' :
			return TypeBinding.FLOAT;
		case 'J' :
			return TypeBinding.LONG;
		case 'S' :
			return TypeBinding.SHORT;
		case 'N':
			return TypeBinding.NULL;
		default :
			return null;
	}
}
 

public void generateStoreSaveValueIfNecessary(CodeStream codeStream){

	// push receiver
	codeStream.aload_0();

	// push the 2 parameters of "setResult(Object, Class)"
	if (this.expression == null || this.expression.resolvedType == TypeBinding.VOID) { // expressionType == VoidBinding if code snippet is the expression "System.out.println()"
		// push null
		codeStream.aconst_null();

		// void.class
		codeStream.generateClassLiteralAccessForType(TypeBinding.VOID, null);
	} else {
		// swap with expression
		int valueTypeID = this.expression.resolvedType.id;
		if (valueTypeID == T_long || valueTypeID == T_double) {
			codeStream.dup_x2();
			codeStream.pop();
		} else {
			codeStream.swap();
		}

		// generate wrapper if needed
		if (this.expression.resolvedType.isBaseType() && this.expression.resolvedType != TypeBinding.NULL) {
			codeStream.generateBoxingConversion(this.expression.resolvedType.id);
		}

		// generate the expression type
		codeStream.generateClassLiteralAccessForType(this.expression.resolvedType, null);
	}

	// generate the invoke virtual to "setResult(Object,Class)"
	codeStream.invoke(Opcodes.OPC_invokevirtual, this.setResultMethod, null /* default declaringClass */);
}
 

private TypeBinding getType(char[] type) {
	TypeBinding binding = null;
	int length = type.length;
	switch(length) {
		case 1 :
			switch (type[0]) {
				case 'I' :
					binding = TypeBinding.INT;
					break;
				case 'Z' :
					binding = TypeBinding.BOOLEAN;
					break;
				case 'V' :
					binding = TypeBinding.VOID;
					break;
				case 'C' :
					binding = TypeBinding.CHAR;
					break;
				case 'D' :
					binding = TypeBinding.DOUBLE;
					break;
				case 'B' :
					binding = TypeBinding.BYTE;
					break;
				case 'F' :
					binding = TypeBinding.FLOAT;
					break;
				case 'J' :
					binding = TypeBinding.LONG;
					break;
				case 'S' :
					binding = TypeBinding.SHORT;
					break;
			}
			break;
		default:
			int dimensions = 0;
			int start = 0;
			while (type[start] == '[') {
				start++;
				dimensions++;
			}
			binding = this.environment.getType(CharOperation.splitOn('/', type, start + 1, length - 1));
			if (dimensions != 0) {
				binding = this.environment.createArrayType(binding, dimensions);
			}
	}
	return binding;
}
 

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, final FlowInfo flowInfo) {
	
	if (this.ignoreFurtherInvestigation) 
		return flowInfo;
	
	FlowInfo lambdaInfo = flowInfo.copy(); // what happens in vegas, stays in vegas ...
	ExceptionHandlingFlowContext methodContext =
			new ExceptionHandlingFlowContext(
					flowContext,
					this,
					this.binding.thrownExceptions,
					null,
					this.scope,
					FlowInfo.DEAD_END);

	// nullity and mark as assigned
	MethodBinding methodWithParameterDeclaration = argumentsTypeElided() ? this.descriptor : this.binding;
	AbstractMethodDeclaration.analyseArguments18(lambdaInfo, this.arguments, methodWithParameterDeclaration);

	if (this.arguments != null) {
		for (int i = 0, count = this.arguments.length; i < count; i++) {
			this.bits |= (this.arguments[i].bits & ASTNode.HasTypeAnnotations);
		}
	}
	
	lambdaInfo = this.body.analyseCode(this.scope, methodContext, lambdaInfo);
	
	// check for missing returning path for block body's ...
	if (this.body instanceof Block) {
		TypeBinding returnTypeBinding = expectedResultType();
		if ((returnTypeBinding == TypeBinding.VOID)) {
			if ((lambdaInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0 || ((Block) this.body).statements == null) {
				this.bits |= ASTNode.NeedFreeReturn;
			}
		} else {
			if (lambdaInfo != FlowInfo.DEAD_END) {
				this.scope.problemReporter().shouldReturn(returnTypeBinding, this);
			}
		}
	} else { // Expression
		if (currentScope.compilerOptions().isAnnotationBasedNullAnalysisEnabled 
				&& lambdaInfo.reachMode() == FlowInfo.REACHABLE)
		{
			Expression expression = (Expression)this.body;
			checkAgainstNullAnnotation(flowContext, expression, expression.nullStatus(lambdaInfo, flowContext));
		}
	}
	return flowInfo;
}
 

/**
 * Get a resolved copy of this lambda for use by type inference, as to avoid spilling any premature
 * type results into the original lambda.
 * 
 * @param targetType the target functional type against which inference is attempted, must be a non-null valid functional type 
 * @return a resolved copy of 'this' or null if significant errors where encountered
 */
public LambdaExpression getResolvedCopyForInferenceTargeting(TypeBinding targetType) {
	// note: this is essentially a simplified extract from isCompatibleWith(TypeBinding,Scope).
	if (this.shapeAnalysisComplete && this.binding != null)
		return this;
	
	targetType = targetType.uncapture(this.enclosingScope);
	// TODO: caching
	IErrorHandlingPolicy oldPolicy = this.enclosingScope.problemReporter().switchErrorHandlingPolicy(silentErrorHandlingPolicy);
	final CompilerOptions compilerOptions = this.enclosingScope.compilerOptions();
	boolean analyzeNPE = compilerOptions.isAnnotationBasedNullAnalysisEnabled;
	final LambdaExpression copy = copy();
	if (copy == null) {
		return null;
	}
	try {
		compilerOptions.isAnnotationBasedNullAnalysisEnabled = false;
		copy.setExpressionContext(this.expressionContext);
		copy.setExpectedType(targetType);
		this.hasIgnoredMandatoryErrors = false;
		TypeBinding type = copy.resolveType(this.enclosingScope);
		if (type == null || !type.isValidBinding())
			return null;
		if (this.body instanceof Block) {
			if (copy.returnsVoid) {
				copy.shapeAnalysisComplete = true;
			} else {
				copy.valueCompatible = this.returnsValue;
			}
		} else {
			copy.voidCompatible = ((Expression) this.body).statementExpression();
			TypeBinding resultType = ((Expression) this.body).resolvedType;
			if (resultType == null) // case of a yet-unresolved poly expression?
				copy.valueCompatible = true;
			else
				copy.valueCompatible = (resultType != TypeBinding.VOID);
			copy.shapeAnalysisComplete = true;
		}
		// Do not proceed with data/control flow analysis if resolve encountered errors.
		if (!this.hasIgnoredMandatoryErrors && !enclosingScopesHaveErrors()) {
			// value compatibility of block lambda's is the only open question.
			if (!copy.shapeAnalysisComplete)
				copy.valueCompatible = copy.doesNotCompleteNormally();
		} else {
			if (!copy.returnsVoid)
				copy.valueCompatible = true; // optimistically, TODO: is this OK??
		}
		
		copy.shapeAnalysisComplete = true;
		copy.resultExpressions = this.resultExpressions;
		this.resultExpressions = NO_EXPRESSIONS;
	} finally {
		compilerOptions.isAnnotationBasedNullAnalysisEnabled = analyzeNPE;
		this.hasIgnoredMandatoryErrors = false;
		this.enclosingScope.problemReporter().switchErrorHandlingPolicy(oldPolicy);
	}
	return copy;
}
 

public void unusedPrivateMethod(AbstractMethodDeclaration methodDecl) {

	int severity = computeSeverity(IProblem.UnusedPrivateMethod);
	if (severity == ProblemSeverities.Ignore) return;

	MethodBinding method = methodDecl.binding;

	// no report for serialization support 'void readObject(ObjectInputStream)'
	if (!method.isStatic()
			&& TypeBinding.VOID == method.returnType
			&& method.parameters.length == 1
			&& method.parameters[0].dimensions() == 0
			&& CharOperation.equals(method.selector, TypeConstants.READOBJECT)
			&& CharOperation.equals(TypeConstants.CharArray_JAVA_IO_OBJECTINPUTSTREAM, method.parameters[0].readableName())) {
		return;
	}
	// no report for serialization support 'void writeObject(ObjectOutputStream)'
	if (!method.isStatic()
			&& TypeBinding.VOID == method.returnType
			&& method.parameters.length == 1
			&& method.parameters[0].dimensions() == 0
			&& CharOperation.equals(method.selector, TypeConstants.WRITEOBJECT)
			&& CharOperation.equals(TypeConstants.CharArray_JAVA_IO_OBJECTOUTPUTSTREAM, method.parameters[0].readableName())) {
		return;
	}
	// no report for serialization support 'Object readResolve()'
	if (!method.isStatic()
			&& TypeIds.T_JavaLangObject == method.returnType.id
			&& method.parameters.length == 0
			&& CharOperation.equals(method.selector, TypeConstants.READRESOLVE)) {
		return;
	}
	// no report for serialization support 'Object writeReplace()'
	if (!method.isStatic()
			&& TypeIds.T_JavaLangObject == method.returnType.id
			&& method.parameters.length == 0
			&& CharOperation.equals(method.selector, TypeConstants.WRITEREPLACE)) {
		return;
	}
	if (excludeDueToAnnotation(methodDecl.annotations, IProblem.UnusedPrivateMethod)) return;
	
	this.handle(
			IProblem.UnusedPrivateMethod,
		new String[] {
			new String(method.declaringClass.readableName()),
			new String(method.selector),
			typesAsString(method, false)
		 },
		new String[] {
			new String(method.declaringClass.shortReadableName()),
			new String(method.selector),
			typesAsString(method, true)
		 },
		severity,
		methodDecl.sourceStart,
		methodDecl.sourceEnd);
}
 

public void unusedPrivateMethod(AbstractMethodDeclaration methodDecl) {

	int severity = computeSeverity(IProblem.UnusedPrivateMethod);
	if (severity == ProblemSeverities.Ignore) return;

	MethodBinding method = methodDecl.binding;

	// no report for serialization support 'void readObject(ObjectInputStream)'
	if (!method.isStatic()
			&& TypeBinding.VOID == method.returnType
			&& method.parameters.length == 1
			&& method.parameters[0].dimensions() == 0
			&& CharOperation.equals(method.selector, TypeConstants.READOBJECT)
			&& CharOperation.equals(TypeConstants.CharArray_JAVA_IO_OBJECTINPUTSTREAM, method.parameters[0].readableName())) {
		return;
	}
	// no report for serialization support 'void writeObject(ObjectOutputStream)'
	if (!method.isStatic()
			&& TypeBinding.VOID == method.returnType
			&& method.parameters.length == 1
			&& method.parameters[0].dimensions() == 0
			&& CharOperation.equals(method.selector, TypeConstants.WRITEOBJECT)
			&& CharOperation.equals(TypeConstants.CharArray_JAVA_IO_OBJECTOUTPUTSTREAM, method.parameters[0].readableName())) {
		return;
	}
	// no report for serialization support 'Object readResolve()'
	if (!method.isStatic()
			&& TypeIds.T_JavaLangObject == method.returnType.id
			&& method.parameters.length == 0
			&& CharOperation.equals(method.selector, TypeConstants.READRESOLVE)) {
		return;
	}
	// no report for serialization support 'Object writeReplace()'
	if (!method.isStatic()
			&& TypeIds.T_JavaLangObject == method.returnType.id
			&& method.parameters.length == 0
			&& CharOperation.equals(method.selector, TypeConstants.WRITEREPLACE)) {
		return;
	}
	if (excludeDueToAnnotation(methodDecl.annotations)) return;
	
	this.handle(
			IProblem.UnusedPrivateMethod,
		new String[] {
			new String(method.declaringClass.readableName()),
			new String(method.selector),
			typesAsString(method, false)
		 },
		new String[] {
			new String(method.declaringClass.shortReadableName()),
			new String(method.selector),
			typesAsString(method, true)
		 },
		severity,
		methodDecl.sourceStart,
		methodDecl.sourceEnd);
}