Java TypeIds.BOXING属性代码示例

boolean resolveBoxing(Expression expression) {
	org.eclipse.jdt.internal.compiler.ast.ASTNode node = (org.eclipse.jdt.internal.compiler.ast.ASTNode) this.newAstToOldAst.get(expression);
	if (node instanceof org.eclipse.jdt.internal.compiler.ast.Expression) {
		org.eclipse.jdt.internal.compiler.ast.Expression compilerExpression = (org.eclipse.jdt.internal.compiler.ast.Expression) node;
		return (compilerExpression.implicitConversion & TypeIds.BOXING) != 0;
	}
	return false;
}
 

/**
 * Cast expressions will considered as useful if removing them all would actually bind to a different method
 * (no fine grain analysis on per casted argument basis, simply separate widening cast from narrowing ones)
 */
public static void checkNeedForArgumentCasts(BlockScope scope, Expression receiver, TypeBinding receiverType, MethodBinding binding, Expression[] arguments, TypeBinding[] argumentTypes, final InvocationSite invocationSite) {
	if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return;

	int length = argumentTypes.length;

	// iterate over arguments, and retrieve original argument types (before cast)
	TypeBinding[] rawArgumentTypes = argumentTypes;
	for (int i = 0; i < length; i++) {
		Expression argument = arguments[i];
		if (argument instanceof CastExpression) {
			// narrowing conversion on base type may change value, thus necessary
			if ((argument.bits & ASTNode.UnnecessaryCast) == 0 && argument.resolvedType.isBaseType()) {
				continue;
			}
			TypeBinding castedExpressionType = ((CastExpression)argument).expression.resolvedType;
			if (castedExpressionType == null) return; // cannot do better
			// obvious identity cast
			if (TypeBinding.equalsEquals(castedExpressionType, argumentTypes[i])) {
				scope.problemReporter().unnecessaryCast((CastExpression)argument);
			} else if (castedExpressionType == TypeBinding.NULL){
				continue; // tolerate null argument cast
			} else if ((argument.implicitConversion & TypeIds.BOXING) != 0) {
				continue; // boxing has a side effect: (int) char   is not boxed as simple char
			} else {
				if (rawArgumentTypes == argumentTypes) {
					System.arraycopy(rawArgumentTypes, 0, rawArgumentTypes = new TypeBinding[length], 0, length);
				}
				// retain original argument type
				rawArgumentTypes[i] = castedExpressionType;
			}
		}
	}
	// perform alternate lookup with original types
	if (rawArgumentTypes != argumentTypes) {
		checkAlternateBinding(scope, receiver, receiverType, binding, arguments, argumentTypes, rawArgumentTypes, invocationSite);
	}
}
 

/**
 * @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
 */
public TypeBinding postConversionType(Scope scope) {
	TypeBinding convertedType = this.resolvedType;
	if (this.genericCast != null)
		convertedType = this.genericCast;
	int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
	switch (runtimeType) {
		case T_boolean :
			convertedType = TypeBinding.BOOLEAN;
			break;
		case T_byte :
			convertedType = TypeBinding.BYTE;
			break;
		case T_short :
			convertedType = TypeBinding.SHORT;
			break;
		case T_char :
			convertedType = TypeBinding.CHAR;
			break;
		case T_int :
			convertedType = TypeBinding.INT;
			break;
		case T_float :
			convertedType = TypeBinding.FLOAT;
			break;
		case T_long :
			convertedType = TypeBinding.LONG;
			break;
		case T_double :
			convertedType = TypeBinding.DOUBLE;
			break;
		default :
	}
	if ((this.implicitConversion & TypeIds.BOXING) != 0) {
		convertedType = scope.environment().computeBoxingType(convertedType);
	}
	return convertedType;
}
 

/**
 * Returns the type of the expression after required implicit conversions. When expression type gets promoted
 * or inserted a generic cast, the converted type will differ from the resolved type (surface side-effects from
 * #computeConversion(...)).
 * @return the type after implicit conversion
 */
public TypeBinding postConversionType(Scope scope) {
	TypeBinding convertedType = this.resolvedType;
	int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
	switch (runtimeType) {
		case T_boolean :
			convertedType = TypeBinding.BOOLEAN;
			break;
		case T_byte :
			convertedType = TypeBinding.BYTE;
			break;
		case T_short :
			convertedType = TypeBinding.SHORT;
			break;
		case T_char :
			convertedType = TypeBinding.CHAR;
			break;
		case T_int :
			convertedType = TypeBinding.INT;
			break;
		case T_float :
			convertedType = TypeBinding.FLOAT;
			break;
		case T_long :
			convertedType = TypeBinding.LONG;
			break;
		case T_double :
			convertedType = TypeBinding.DOUBLE;
			break;
		default :
	}
	if ((this.implicitConversion & TypeIds.BOXING) != 0) {
		convertedType = scope.environment().computeBoxingType(convertedType);
	}
	return convertedType;
}
 

/**
 * Returns an object which can be used to identify identical JSR sequence targets
 * (see TryStatement subroutine codegen)
 * or <code>null</null> if not reusable
 */
public Object reusableJSRTarget() {
	if (this.constant != Constant.NotAConstant && (this.implicitConversion & TypeIds.BOXING) == 0) {
		return this.constant;
	}
	return null;
}
 

/**
 * @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
 */
public TypeBinding postConversionType(Scope scope) {
	TypeBinding convertedType = this.resolvedType;
	TypeBinding requiredGenericCast = getGenericCast(this.otherBindings == null ? 0 : this.otherBindings.length);
	if (requiredGenericCast != null)
		convertedType = requiredGenericCast;
	int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
	switch (runtimeType) {
		case T_boolean :
			convertedType = TypeBinding.BOOLEAN;
			break;
		case T_byte :
			convertedType = TypeBinding.BYTE;
			break;
		case T_short :
			convertedType = TypeBinding.SHORT;
			break;
		case T_char :
			convertedType = TypeBinding.CHAR;
			break;
		case T_int :
			convertedType = TypeBinding.INT;
			break;
		case T_float :
			convertedType = TypeBinding.FLOAT;
			break;
		case T_long :
			convertedType = TypeBinding.LONG;
			break;
		case T_double :
			convertedType = TypeBinding.DOUBLE;
			break;
		default :
	}
	if ((this.implicitConversion & TypeIds.BOXING) != 0) {
		convertedType = scope.environment().computeBoxingType(convertedType);
	}
	return convertedType;
}
 

/**
 * @see org.eclipse.jdt.internal.compiler.ast.Expression#postConversionType(Scope)
 */
public TypeBinding postConversionType(Scope scope) {
	TypeBinding convertedType = this.resolvedType;
	if (this.valueCast != null)
		convertedType = this.valueCast;
	int runtimeType = (this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4;
	switch (runtimeType) {
		case T_boolean :
			convertedType = TypeBinding.BOOLEAN;
			break;
		case T_byte :
			convertedType = TypeBinding.BYTE;
			break;
		case T_short :
			convertedType = TypeBinding.SHORT;
			break;
		case T_char :
			convertedType = TypeBinding.CHAR;
			break;
		case T_int :
			convertedType = TypeBinding.INT;
			break;
		case T_float :
			convertedType = TypeBinding.FLOAT;
			break;
		case T_long :
			convertedType = TypeBinding.LONG;
			break;
		case T_double :
			convertedType = TypeBinding.DOUBLE;
			break;
		default :
	}
	if ((this.implicitConversion & TypeIds.BOXING) != 0) {
		convertedType = scope.environment().computeBoxingType(convertedType);
	}
	return convertedType;
}
 

/**
 * Cast expressions will considered as useful if removing them all would actually bind to a different method
 * (no fine grain analysis on per casted argument basis, simply separate widening cast from narrowing ones)
 */
public static void checkNeedForArgumentCasts(BlockScope scope, Expression receiver, TypeBinding receiverType, MethodBinding binding, Expression[] arguments, TypeBinding[] argumentTypes, final InvocationSite invocationSite) {
	if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return;

	int length = argumentTypes.length;

	// iterate over arguments, and retrieve original argument types (before cast)
	TypeBinding[] rawArgumentTypes = argumentTypes;
	for (int i = 0; i < length; i++) {
		Expression argument = arguments[i];
		if (argument instanceof CastExpression) {
			// narrowing conversion on base type may change value, thus necessary
			if ((argument.bits & ASTNode.UnnecessaryCast) == 0 && argument.resolvedType.isBaseType()) {
				continue;
			}
			TypeBinding castedExpressionType = ((CastExpression)argument).expression.resolvedType;
			if (castedExpressionType == null) return; // cannot do better
			// obvious identity cast
			if (castedExpressionType == argumentTypes[i]) {
				scope.problemReporter().unnecessaryCast((CastExpression)argument);
			} else if (castedExpressionType == TypeBinding.NULL){
				continue; // tolerate null argument cast
			} else if ((argument.implicitConversion & TypeIds.BOXING) != 0) {
				continue; // boxing has a side effect: (int) char   is not boxed as simple char
			} else {
				if (rawArgumentTypes == argumentTypes) {
					System.arraycopy(rawArgumentTypes, 0, rawArgumentTypes = new TypeBinding[length], 0, length);
				}
				// retain original argument type
				rawArgumentTypes[i] = castedExpressionType;
			}
		}
	}
	// perform alternate lookup with original types
	if (rawArgumentTypes != argumentTypes) {
		checkAlternateBinding(scope, receiver, receiverType, binding, arguments, argumentTypes, rawArgumentTypes, invocationSite);
	}
}
 

/**
 * Base types need that the widening is explicitly done by the compiler using some bytecode like i2f.
 * Also check unsafe type operations.
 */
public void computeConversion(Scope scope, TypeBinding runtimeType, TypeBinding compileTimeType) {
	if (runtimeType == null || compileTimeType == null)
		return;
	if (this.implicitConversion != 0) return; // already set independently

	// it is possible for a Byte to be unboxed to a byte & then converted to an int
	// but it is not possible for a byte to become Byte & then assigned to an Integer,
	// or to become an int before boxed into an Integer
	if (runtimeType != TypeBinding.NULL && runtimeType.isBaseType()) {
		if (!compileTimeType.isBaseType()) {
			TypeBinding unboxedType = scope.environment().computeBoxingType(compileTimeType);
			this.implicitConversion = TypeIds.UNBOXING;
			scope.problemReporter().autoboxing(this, compileTimeType, runtimeType);
			compileTimeType = unboxedType;
		}
	} else if (compileTimeType != TypeBinding.NULL && compileTimeType.isBaseType()) {
		TypeBinding boxedType = scope.environment().computeBoxingType(runtimeType);
		if (TypeBinding.equalsEquals(boxedType, runtimeType)) // Object o = 12;
			boxedType = compileTimeType;
		this.implicitConversion = TypeIds.BOXING | (boxedType.id << 4) + compileTimeType.id;
		scope.problemReporter().autoboxing(this, compileTimeType, scope.environment().computeBoxingType(boxedType));
		return;
	} else if (this.constant != Constant.NotAConstant && this.constant.typeID() != TypeIds.T_JavaLangString) {
		this.implicitConversion = TypeIds.BOXING;
		return;
	}
	int compileTimeTypeID, runtimeTypeID;
	if ((compileTimeTypeID = compileTimeType.id) >= TypeIds.T_LastWellKnownTypeId) { // e.g. ? extends String  ==> String (103227); >= TypeIds.T_LastWellKnownTypeId implies TypeIds.NoId
		compileTimeTypeID = compileTimeType.erasure().id == TypeIds.T_JavaLangString ? TypeIds.T_JavaLangString : TypeIds.T_JavaLangObject;
	} else if (runtimeType.isPrimitiveType() && compileTimeType instanceof ReferenceBinding && !compileTimeType.isBoxedPrimitiveType()) {
		compileTimeTypeID = TypeIds.T_JavaLangObject; // treatment is the same as for jlO.
	}

	switch (runtimeTypeID = runtimeType.id) {
		case T_byte :
		case T_short :
		case T_char :
			if (compileTimeTypeID == TypeIds.T_JavaLangObject) {
				this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			} else {
				this.implicitConversion |= (TypeIds.T_int << 4) + compileTimeTypeID;
			}
			break;
		case T_JavaLangString :
		case T_float :
		case T_boolean :
		case T_double :
		case T_int : //implicitConversion may result in i2i which will result in NO code gen
		case T_long :
			this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			break;
		default : // regular object ref
//				if (compileTimeType.isRawType() && runtimeTimeType.isBoundParameterizedType()) {
//				    scope.problemReporter().unsafeRawExpression(this, compileTimeType, runtimeTimeType);
//				}
	}
}
 

/**
 * Base types need that the widening is explicitly done by the compiler using some bytecode like i2f.
 * Also check unsafe type operations.
 */
public void computeConversion(Scope scope, TypeBinding runtimeType, TypeBinding compileTimeType) {
	if (runtimeType == null || compileTimeType == null)
		return;
	if (this.implicitConversion != 0) return; // already set independantly

	// it is possible for a Byte to be unboxed to a byte & then converted to an int
	// but it is not possible for a byte to become Byte & then assigned to an Integer,
	// or to become an int before boxed into an Integer
	if (runtimeType != TypeBinding.NULL && runtimeType.isBaseType()) {
		if (!compileTimeType.isBaseType()) {
			TypeBinding unboxedType = scope.environment().computeBoxingType(compileTimeType);
			this.implicitConversion = TypeIds.UNBOXING;
			scope.problemReporter().autoboxing(this, compileTimeType, runtimeType);
			compileTimeType = unboxedType;
		}
	} else if (compileTimeType != TypeBinding.NULL && compileTimeType.isBaseType()) {
		TypeBinding boxedType = scope.environment().computeBoxingType(runtimeType);
		if (boxedType == runtimeType) // Object o = 12;
			boxedType = compileTimeType;
		this.implicitConversion = TypeIds.BOXING | (boxedType.id << 4) + compileTimeType.id;
		scope.problemReporter().autoboxing(this, compileTimeType, scope.environment().computeBoxingType(boxedType));
		return;
	} else if (this.constant != Constant.NotAConstant && this.constant.typeID() != TypeIds.T_JavaLangString) {
		this.implicitConversion = TypeIds.BOXING;
		return;
	}
	int compileTimeTypeID, runtimeTypeID;
	if ((compileTimeTypeID = compileTimeType.id) == TypeIds.NoId) { // e.g. ? extends String  ==> String (103227)
		compileTimeTypeID = compileTimeType.erasure().id == TypeIds.T_JavaLangString ? TypeIds.T_JavaLangString : TypeIds.T_JavaLangObject;
	}
	switch (runtimeTypeID = runtimeType.id) {
		case T_byte :
		case T_short :
		case T_char :
			if (compileTimeTypeID == TypeIds.T_JavaLangObject) {
				this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			} else {
				this.implicitConversion |= (TypeIds.T_int << 4) + compileTimeTypeID;
			}
			break;
		case T_JavaLangString :
		case T_float :
		case T_boolean :
		case T_double :
		case T_int : //implicitConversion may result in i2i which will result in NO code gen
		case T_long :
			this.implicitConversion |= (runtimeTypeID << 4) + compileTimeTypeID;
			break;
		default : // regular object ref
//				if (compileTimeType.isRawType() && runtimeTimeType.isBoundParameterizedType()) {
//				    scope.problemReporter().unsafeRawExpression(this, compileTimeType, runtimeTimeType);
//				}
	}
}