org.eclipse.jdt.internal.compiler.ast
类 CombinedBinaryExpression

java.lang.Object
  org.eclipse.jdt.internal.compiler.ast.ASTNode
      org.eclipse.jdt.internal.compiler.ast.Statement
          org.eclipse.jdt.internal.compiler.ast.Expression
              org.eclipse.jdt.internal.compiler.ast.OperatorExpression
                  org.eclipse.jdt.internal.compiler.ast.BinaryExpression
                      org.eclipse.jdt.internal.compiler.ast.CombinedBinaryExpression

所有已实现的接口：

OperatorIds, TypeConstants, TypeIds

public class CombinedBinaryExpression
extends BinaryExpression

CombinedBinaryExpression is an implementation of BinaryExpression that specifically attempts to mitigate the issues raised by expressions which have a very deep leftmost branch. It does so by maintaining a table of direct references to its subexpressions, and implementing non-recursive variants of the most significant recursive algorithms of its ancestors. The subexpressions table only holds intermediate binary expressions. Its role is to provide the reversed navigation through the left relationship of BinaryExpression to Expression. To cope with potentially very deep left branches, an instance of CombinedBinaryExpression is created once in a while, using variable thresholds held by arityMax. As a specific case, the topmost node of all binary expressions that are deeper than one is a CombinedBinaryExpression, but it has no references table.
Notes:

• CombinedBinaryExpression is not meant to behave in other ways than BinaryExpression in any observable respect;
• visitors that implement their own traversal upon binary expressions should consider taking advantage of combined binary expressions, or else face a risk of StackOverflowError upon deep instances;
• callers that need to change the operator should rebuild the expression from scratch, or else amend the references table as needed to cope with the resulting, separated expressions.

字段摘要

int	arity The number of consecutive binary expressions of this' left branch that bear the same operator as this.
static int	ARITY_MAX_MAX Upper limit for arityMax.
static int	ARITY_MAX_MIN Default lower limit for arityMax.
int	arityMax The threshold that will trigger the creation of the next full-fledged CombinedBinaryExpression.
static int	defaultArityMaxStartingValue Default value for the first term of the series of arityMax values.
BinaryExpression[]	referencesTable A table of references to the binary expressions of this' left branch.

从类 org.eclipse.jdt.internal.compiler.ast.BinaryExpression 继承的字段

left, optimizedBooleanConstant, right

从类 org.eclipse.jdt.internal.compiler.ast.OperatorExpression 继承的字段

OperatorSignatures

从类 org.eclipse.jdt.internal.compiler.ast.Expression 继承的字段

constant, implicitConversion, resolvedType, statementEnd

从类 org.eclipse.jdt.internal.compiler.ast.Statement 继承的字段

COMPLAINED_FAKE_REACHABLE, COMPLAINED_UNREACHABLE, NOT_COMPLAINED

从类 org.eclipse.jdt.internal.compiler.ast.ASTNode 继承的字段

Bit1, Bit10, Bit11, Bit12, Bit13, Bit14, Bit15, Bit16, Bit17, Bit18, Bit19, Bit2, Bit20, Bit21, Bit22, Bit23, Bit24, Bit25, Bit26, Bit27, Bit28, Bit29, Bit3, Bit30, Bit31, Bit32, Bit32L, Bit33L, Bit34L, Bit35L, Bit36L, Bit37L, Bit38L, Bit39L, Bit4, Bit40L, Bit41L, Bit42L, Bit43L, Bit44L, Bit45L, Bit46L, Bit47L, Bit48L, Bit49L, Bit5, Bit50L, Bit51L, Bit52L, Bit53L, Bit54L, Bit55L, Bit56L, Bit57L, Bit58L, Bit59L, Bit6, Bit60L, Bit61L, Bit62L, Bit63L, Bit64L, Bit7, Bit8, Bit9, bits, BlockExit, CanBeStatic, ContainsAssertion, DepthMASK, DepthSHIFT, DidResolve, DisableUnnecessaryCastCheck, DiscardEnclosingInstance, DocumentedFallthrough, Empty, ErrorInSignature, FirstAssignmentToLocal, GenerateCheckcast, HasAbstractMethods, HasAllMethodBodies, HasBeenGenerated, HasBeenResolved, HasLocalType, HasSyntaxErrors, IgnoreNoEffectAssignCheck, IgnoreRawTypeCheck, InsideExpressionStatement, InsideJavadoc, INVOCATION_ARGUMENT_OK, INVOCATION_ARGUMENT_UNCHECKED, INVOCATION_ARGUMENT_WILDCARD, IsAnnotationDefaultValue, IsAnonymousType, IsAnySubRoutineEscaping, IsArgument, IsCompoundAssigned, IsDefaultConstructor, IsDiamond, IsElseIfStatement, IsElseStatementUnreachable, IsImplicitThis, IsImplicitUnit, IsLocalDeclarationReachable, IsLocalType, IsMemberType, IsNonNull, IsReachable, IsRecovered, IsReturnedValue, IsSecondaryType, IsStrictlyAssigned, IsSubRoutineEscaping, IsSuperType, IsSynchronized, IsThenStatementUnreachable, IsTryBlockExiting, IsUnionType, IsUsefulEmptyStatement, IsVarArgs, LabelUsed, NeededScope, NeedFreeReturn, NeedReceiverGenericCast, OnDemand, OperatorMASK, OperatorSHIFT, OverridingMethodWithSupercall, ParenthesizedMASK, ParenthesizedSHIFT, ResolveJavadoc, RestrictiveFlagMASK, ReturnTypeIDMASK, sourceEnd, sourceStart, SuperAccess, ThenExit, Unchecked, UndocumentedEmptyBlock, UnnecessaryCast, UnsafeCast, Used

从接口 org.eclipse.jdt.internal.compiler.ast.OperatorIds 继承的字段

AND, AND_AND, DIVIDE, EQUAL, EQUAL_EQUAL, GREATER, GREATER_EQUAL, INSTANCEOF, LEFT_SHIFT, LESS, LESS_EQUAL, MINUS, MINUS_MINUS, MULTIPLY, NOT, NOT_EQUAL, NumberOfTables, OR, OR_OR, PLUS, PLUS_PLUS, QUESTIONCOLON, REMAINDER, RIGHT_SHIFT, TWIDDLE, UNSIGNED_RIGHT_SHIFT, XOR

从接口 org.eclipse.jdt.internal.compiler.lookup.TypeConstants 继承的字段

ANNOTATION, ANNOTATION_PREFIX, ANNOTATION_SUFFIX, ANONYM_PREFIX, ANONYM_SUFFIX, BOOLEAN, BYTE, CHAR, CharArray_JAVA_IO_OBJECTINPUTSTREAM, CharArray_JAVA_IO_OBJECTOUTPUTSTREAM, CharArray_JAVA_IO_OBJECTSTREAMFIELD, CharArray_JAVA_LANG_ANNOTATION_ANNOTATION, CharArray_JAVA_LANG_ENUM, CharArray_JAVA_LANG_OBJECT, CLINIT, CLONE, CONSTRAINT_EQUAL, CONSTRAINT_EXTENDS, CONSTRAINT_SUPER, DOUBLE, EQUALS, FLOAT, GETCLASS, HASHCODE, INIT, INT, INVOKE, IO, JAVA, JAVA_IO, JAVA_IO_EXTERNALIZABLE, JAVA_IO_IOEXCEPTION, JAVA_IO_OBJECTINPUTSTREAM, JAVA_IO_OBJECTOUTPUTSTREAM, JAVA_IO_OBJECTSTREAMEXCEPTION, JAVA_IO_PRINTSTREAM, JAVA_IO_SERIALIZABLE, JAVA_LANG, JAVA_LANG_ANNOTATION_ANNOTATION, JAVA_LANG_ANNOTATION_DOCUMENTED, JAVA_LANG_ANNOTATION_ELEMENTTYPE, JAVA_LANG_ANNOTATION_INHERITED, JAVA_LANG_ANNOTATION_RETENTION, JAVA_LANG_ANNOTATION_RETENTIONPOLICY, JAVA_LANG_ANNOTATION_TARGET, JAVA_LANG_ASSERTIONERROR, JAVA_LANG_AUTOCLOSEABLE, JAVA_LANG_BOOLEAN, JAVA_LANG_BYTE, JAVA_LANG_CHARACTER, JAVA_LANG_CLASS, JAVA_LANG_CLASSNOTFOUNDEXCEPTION, JAVA_LANG_CLONEABLE, JAVA_LANG_DEPRECATED, JAVA_LANG_DOUBLE, JAVA_LANG_ENUM, JAVA_LANG_ERROR, JAVA_LANG_EXCEPTION, JAVA_LANG_FLOAT, JAVA_LANG_ILLEGALARGUMENTEXCEPTION, JAVA_LANG_INTEGER, JAVA_LANG_INVOKE_METHODHANDLE_$_POLYMORPHICSIGNATURE, JAVA_LANG_INVOKE_METHODHANDLE_POLYMORPHICSIGNATURE, JAVA_LANG_ITERABLE, JAVA_LANG_LONG, JAVA_LANG_NOCLASSDEFERROR, JAVA_LANG_OBJECT, JAVA_LANG_OVERRIDE, JAVA_LANG_REFLECT_CONSTRUCTOR, JAVA_LANG_REFLECT_FIELD, JAVA_LANG_REFLECT_METHOD, JAVA_LANG_RUNTIMEEXCEPTION, JAVA_LANG_SAFEVARARGS, JAVA_LANG_SHORT, JAVA_LANG_STRING, JAVA_LANG_STRINGBUFFER, JAVA_LANG_STRINGBUILDER, JAVA_LANG_SUPPRESSWARNINGS, JAVA_LANG_SYSTEM, JAVA_LANG_THROWABLE, JAVA_LANG_VOID, JAVA_UTIL_COLLECTION, JAVA_UTIL_ITERATOR, JAVAX_RMI_CORBA_STUB, LANG, LENGTH, LONG, MAIN, MISMATCH, NULL, OBJECT, OK, PACKAGE_INFO_NAME, READOBJECT, READRESOLVE, REFLECT, SERIALPERSISTENTFIELDS, SERIALVERSIONUID, SHORT, SYNTHETIC_ACCESS_METHOD_PREFIX, SYNTHETIC_ASSERT_DISABLED, SYNTHETIC_CLASS, SYNTHETIC_ENCLOSING_INSTANCE_PREFIX, SYNTHETIC_ENUM_CONSTANT_INITIALIZATION_METHOD_PREFIX, SYNTHETIC_ENUM_VALUES, SYNTHETIC_OUTER_LOCAL_PREFIX, SYNTHETIC_STATIC_FACTORY, SYNTHETIC_SWITCH_ENUM_TABLE, TYPE, UNCHECKED, UPPER_ANNOTATION_TYPE, UPPER_CLASS, UPPER_CONSTRUCTOR, UPPER_FIELD, UPPER_LOCAL_VARIABLE, UPPER_METHOD, UPPER_PACKAGE, UPPER_PARAMETER, UPPER_RUNTIME, UPPER_SOURCE, UTIL, VALUE, VALUEOF, VALUES, VOID, WILDCARD_CAPTURE, WILDCARD_CAPTURE_NAME_PREFIX, WILDCARD_CAPTURE_NAME_SUFFIX, WILDCARD_EXTENDS, WILDCARD_MINUS, WILDCARD_NAME, WILDCARD_PLUS, WILDCARD_STAR, WILDCARD_SUPER, WRITEOBJECT, WRITEREPLACE

从接口 org.eclipse.jdt.internal.compiler.lookup.TypeIds 继承的字段

Boolean2Boolean, Boolean2Int, Boolean2String, BOXING, Byte2Byte, Byte2Char, Byte2Double, Byte2Float, Byte2Int, Byte2Long, Byte2Short, Byte2String, Char2Byte, Char2Char, Char2Double, Char2Float, Char2Int, Char2Long, Char2Short, Char2String, COMPILE_TYPE_MASK, Double2Byte, Double2Char, Double2Double, Double2Float, Double2Int, Double2Long, Double2Short, Double2String, Float2Byte, Float2Char, Float2Double, Float2Float, Float2Int, Float2Long, Float2Short, Float2String, IMPLICIT_CONVERSION_MASK, Int2Byte, Int2Char, Int2Double, Int2Float, Int2Int, Int2Long, Int2Short, Int2String, Long2Byte, Long2Char, Long2Double, Long2Float, Long2Int, Long2Long, Long2Short, Long2String, NoId, Null2Null, Null2String, Object2boolean, Object2byte, Object2char, Object2double, Object2float, Object2int, Object2long, Object2Object, Object2short, Object2String, Short2Byte, Short2Char, Short2Double, Short2Float, Short2Int, Short2Long, Short2Short, Short2String, String2String, T_boolean, T_byte, T_char, T_double, T_float, T_int, T_JavaIoException, T_JavaIoExternalizable, T_JavaIoObjectStreamException, T_JavaIoPrintStream, T_JavaIoSerializable, T_JavaLangAnnotationAnnotation, T_JavaLangAnnotationDocumented, T_JavaLangAnnotationElementType, T_JavaLangAnnotationInherited, T_JavaLangAnnotationRetention, T_JavaLangAnnotationRetentionPolicy, T_JavaLangAnnotationTarget, T_JavaLangAssertionError, T_JavaLangAutoCloseable, T_JavaLangBoolean, T_JavaLangByte, T_JavaLangCharacter, T_JavaLangClass, T_JavaLangClassNotFoundException, T_JavaLangCloneable, T_JavaLangDeprecated, T_JavaLangDouble, T_JavaLangEnum, T_JavaLangError, T_JavaLangException, T_JavaLangFloat, T_JavaLangIllegalArgumentException, T_JavaLangInteger, T_JavaLangInvokeMethodHandlePolymorphicSignature, T_JavaLangIterable, T_JavaLangLong, T_JavaLangNoClassDefError, T_JavaLangObject, T_JavaLangOverride, T_JavaLangReflectConstructor, T_JavaLangReflectField, T_JavaLangReflectMethod, T_JavaLangRuntimeException, T_JavaLangSafeVarargs, T_JavaLangShort, T_JavaLangString, T_JavaLangStringBuffer, T_JavaLangStringBuilder, T_JavaLangSuppressWarnings, T_JavaLangSystem, T_JavaLangThrowable, T_JavaLangVoid, T_JavaUtilCollection, T_JavaUtilIterator, T_long, T_null, T_short, T_undefined, T_void, UNBOXING

构造方法摘要

CombinedBinaryExpression(CombinedBinaryExpression expression)

CombinedBinaryExpression(Expression left, Expression right, int operator, int arity)
Make a new CombinedBinaryExpression.

方法摘要

FlowInfo	analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo)
void	generateOptimizedStringConcatenation(BlockScope blockScope, CodeStream codeStream, int typeID)
void	generateOptimizedStringConcatenationCreation(BlockScope blockScope, CodeStream codeStream, int typeID)
StringBuffer	printExpressionNoParenthesis(int indent, StringBuffer output)
TypeBinding	resolveType(BlockScope scope) Resolve the type of this expression in the context of a blockScope
void	traverse(ASTVisitor visitor, BlockScope scope) Traverse an expression in the context of a blockScope
void	tuneArityMax() Change arityMax if and as needed.

从类 org.eclipse.jdt.internal.compiler.ast.BinaryExpression 继承的方法

computeConstant, generateCode, generateLogicalAnd, generateLogicalOr, generateLogicalXor, generateOptimizedBoolean, generateOptimizedGreaterThan, generateOptimizedGreaterThanOrEqual, generateOptimizedLessThan, generateOptimizedLessThanOrEqual, generateOptimizedLogicalAnd, generateOptimizedLogicalOr, generateOptimizedLogicalXor, isCompactableOperation, optimizedBooleanConstant, optimizedBooleanConstant

从类 org.eclipse.jdt.internal.compiler.ast.OperatorExpression 继承的方法

classInitialize, generateTableTestCase, get_AND_AND, get_AND, get_DIVIDE, get_EQUAL_EQUAL, get_GREATER_EQUAL, get_GREATER, get_LEFT_SHIFT, get_LESS_EQUAL, get_LESS, get_MINUS, get_MULTIPLY, get_OR_OR, get_OR, get_PLUS, get_REMAINDER, get_RIGHT_SHIFT, get_UNSIGNED_RIGHT_SHIFT, get_XOR, nullStatus, operatorToString, printExpression

从类 org.eclipse.jdt.internal.compiler.ast.Expression 继承的方法

analyseCode, checkCastTypesCompatibility, checkNPE, checkUnsafeCast, computeConversion, forcedToBeRaw, generateCode, getDirectBinding, isConstantValueOfTypeAssignableToType, isConstantValueRepresentable, isTypeReference, localVariableBinding, markAsNonNull, postConversionType, print, printStatement, resolve, resolveType, resolveTypeExpecting, reusableJSRTarget, setExpectedType, tagAsNeedCheckCast, tagAsUnnecessaryCast, toTypeReference, traverse

从类 org.eclipse.jdt.internal.compiler.ast.Statement 继承的方法

branchChainTo, checkAgainstNullAnnotation, complainIfUnreachable, expectedType, generateArguments, isBoxingCompatible, isEmptyBlock, isKnowDeadCodePattern, isValidJavaStatement, resolveCase

从类 org.eclipse.jdt.internal.compiler.ast.ASTNode 继承的方法

checkInvocationArguments, concreteStatement, isFieldUseDeprecated, isImplicitThis, isMethodUseDeprecated, isSuper, isThis, isTypeUseDeprecated, printAnnotations, printIndent, printModifiers, resolveAnnotations, resolveDeprecatedAnnotations, sourceEnd, sourceStart, toString

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细信息

arity

public int arity

The number of consecutive binary expressions of this' left branch that bear the same operator as this.
Notes:

• the presence of a CombinedBinaryExpression instance resets arity, even when its operator is compatible;
• this property is maintained by the parser.

arityMax

public int arityMax

The threshold that will trigger the creation of the next full-fledged CombinedBinaryExpression. This field is only maintained for the topmost binary expression (it is 0 otherwise). It enables a variable policy, which scales better with very large expressions.

ARITY_MAX_MAX

public static final int ARITY_MAX_MAX

Upper limit for arityMax.

另请参见：

常量字段值

ARITY_MAX_MIN

public static final int ARITY_MAX_MIN

Default lower limit for arityMax.

另请参见：

常量字段值

defaultArityMaxStartingValue

public static int defaultArityMaxStartingValue

Default value for the first term of the series of arityMax values. Changing this allows for experimentation. Not meant to be changed during a parse operation.

referencesTable

public BinaryExpression[] referencesTable

A table of references to the binary expressions of this' left branch. Instances of CombinedBinaryExpression are not repeated here. Instead, the left subexpression of referencesTable[0] may be a combined binary expression, if appropriate. Null when this only cares about tracking the expression's arity.

构造方法详细信息

CombinedBinaryExpression

public CombinedBinaryExpression(Expression left,
                                Expression right,
                                int operator,
                                int arity)

Make a new CombinedBinaryExpression. If arity is strictly greater than one, a references table is built and initialized with the reverse relationship of the one defined by BinaryExpression.left. arity and left must be compatible with each other (that is, there must be at least arity - 1 consecutive compatible binary expressions into the leftmost branch of left, the topmost of which being left's immediate left expression).

参数：

left - the left branch expression

right - the right branch expression

operator - the operator for this binary expression - only PLUS for now

arity - the number of binary expressions of a compatible operator that already exist into the leftmost branch of left (including left); must be strictly greater than 0

CombinedBinaryExpression

public CombinedBinaryExpression(CombinedBinaryExpression expression)

方法详细信息

analyseCode

public FlowInfo analyseCode(BlockScope currentScope,
                            FlowContext flowContext,
                            FlowInfo flowInfo)

覆盖：

类 BinaryExpression 中的 analyseCode

generateOptimizedStringConcatenation

public void generateOptimizedStringConcatenation(BlockScope blockScope,
                                                 CodeStream codeStream,
                                                 int typeID)

覆盖：

类 BinaryExpression 中的 generateOptimizedStringConcatenation

generateOptimizedStringConcatenationCreation

public void generateOptimizedStringConcatenationCreation(BlockScope blockScope,
                                                         CodeStream codeStream,
                                                         int typeID)

覆盖：

类 BinaryExpression 中的 generateOptimizedStringConcatenationCreation

printExpressionNoParenthesis

public StringBuffer printExpressionNoParenthesis(int indent,
                                                 StringBuffer output)

覆盖：

类 BinaryExpression 中的 printExpressionNoParenthesis

resolveType

public TypeBinding resolveType(BlockScope scope)

从类 Expression 复制的描述

Resolve the type of this expression in the context of a blockScope

覆盖：

类 BinaryExpression 中的 resolveType

返回：

Return the actual type of this expression after resolution

traverse

public void traverse(ASTVisitor visitor,
                     BlockScope scope)

从类 Expression 复制的描述

Traverse an expression in the context of a blockScope

覆盖：

类 BinaryExpression 中的 traverse

tuneArityMax

public void tuneArityMax()

Change arityMax if and as needed. The current policy is to double arityMax each time this method is called, until it reaches ARITY_MAX_MAX. Other policies may consider incrementing it less agressively. Call only after an appropriate value has been assigned to BinaryExpression.left.