Class Context

java.lang.Object
org.glassfish.rmic.tools.tree.Context
All Implemented Interfaces:
Constants, RuntimeConstants
Direct Known Subclasses:
CheckContext, CodeContext

public class Context extends Object implements Constants
WARNING: The contents of this source file are not part of any supported API. Code that depends on them does so at its own risk: they are subject to change or removal without notice.
  • Field Details

  • Constructor Details

    • Context

      public Context(Context ctx, MemberDefinition field)
      Create the initial context for a method The incoming context is inherited from
    • Context

      public Context(Context ctx, ClassDefinition c)
      Create a new context, for initializing a class.
    • Context

      Context(Context ctx, Node node)
      Create a new nested context, for a block statement
    • Context

      public Context(Context ctx)
  • Method Details

    • declare

      public int declare(Environment env, LocalMember local)
      Declare local
    • getLocalField

      public LocalMember getLocalField(Identifier name)
      Get a local variable by name
    • getScopeNumber

      public int getScopeNumber(ClassDefinition c)
      Get the scope number for a reference to a member of this class (Larger scope numbers are more deeply nested.)
      See Also:
    • getFieldCommon

      private MemberDefinition getFieldCommon(Environment env, Identifier name, boolean apparentOnly) throws AmbiguousMember, ClassNotFound
      Throws:
      AmbiguousMember
      ClassNotFound
    • declareFieldNumber

      public int declareFieldNumber(MemberDefinition field)
      Assign a number to a class field. (This is used to track definite assignment of some blank finals.)
    • getFieldNumber

      public int getFieldNumber(MemberDefinition field)
      Retrieve a number previously assigned by declareMember(). Return -1 if there was no such assignment in this context.
    • getElement

      public MemberDefinition getElement(int number)
      Return the local field or member field corresponding to a number. Return null if there is no such field.
    • getLocalClass

      public LocalMember getLocalClass(Identifier name)
      Get a local class by name
    • getClassCommon

      private MemberDefinition getClassCommon(Environment env, Identifier name, boolean apparentOnly) throws ClassNotFound
      Throws:
      ClassNotFound
    • getField

      public final MemberDefinition getField(Environment env, Identifier name) throws AmbiguousMember, ClassNotFound
      Get either a local variable, or a field in a current class
      Throws:
      AmbiguousMember
      ClassNotFound
    • getApparentField

      public final MemberDefinition getApparentField(Environment env, Identifier name) throws AmbiguousMember, ClassNotFound
      Like getField, except that it skips over inherited fields. Used for error checking.
      Throws:
      AmbiguousMember
      ClassNotFound
    • isInScope

      public boolean isInScope(LocalMember field)
      Check if the given field is active in this context.
    • noteReference

      public UplevelReference noteReference(Environment env, LocalMember target)
      Notice a reference (usually an uplevel one). Update the references list of every enclosing class which is enclosed by the scope of the target. Update decisions about which uplevels to make into fields. Return the uplevel reference descriptor, or null if it's local.

      The target must be in scope in this context. So, call this method only from the check phase. (In other phases, the context may be less complete.)

      This can and should be called both before and after classes are frozen. It should be a no-op, and will raise a compiler error if not.

    • makeReference

      public Expression makeReference(Environment env, LocalMember target)
      Implement a reference (usually an uplevel one). Call noteReference() first, to make sure the reference lists are up to date.

      The resulting expression tree does not need checking; it can be code-generated right away. If the reference is not uplevel, the result is an IDENT or THIS.

    • findOuterLink

      public Expression findOuterLink(Environment env, long where, MemberDefinition f)
      Return a local expression which can serve as the base reference for the given field. If the field is a constructor, return an expression for the implicit enclosing instance argument.

      Return null if there is no need for such an argument, or if there was an error.

    • match

      private static boolean match(Environment env, ClassDefinition thisc, ClassDefinition reqc)
    • findOuterLink

      public Expression findOuterLink(Environment env, long where, ClassDefinition reqc, MemberDefinition f, boolean needExactMatch)
    • outerLinkExists

      public static boolean outerLinkExists(Environment env, ClassDefinition reqc, ClassDefinition thisc)
      Is there a "this" of type reqc in scope?
    • findScope

      public ClassDefinition findScope(Environment env, ClassDefinition reqc)
      From which enclosing class do members of this type come?
    • resolveName

      Identifier resolveName(Environment env, Identifier name)
      Resolve a type name from within a local scope.
      See Also:
    • getApparentClassName

      public Identifier getApparentClassName(Environment env, Identifier name)
      Return the name of a lexically apparent type, skipping inherited members, and ignoring the current pacakge and imports. This is used for error checking.
    • checkBackBranch

      public void checkBackBranch(Environment env, Statement loop, Vset vsEntry, Vset vsBack)
      Raise an error if a blank final was definitely unassigned on entry to a loop, but has possibly been assigned on the back-branch. If this is the case, the loop may be assigning it multiple times.
    • canReach

      public boolean canReach(Environment env, MemberDefinition f)
      Check if a field can reach another field (only considers forward references, not the access modifiers).
    • getLabelContext

      public Context getLabelContext(Identifier lbl)
      Get the context that corresponds to a label, return null if not found.
    • getBreakContext

      public Context getBreakContext(Identifier lbl)
      Get the destination context of a break
    • getContinueContext

      public Context getContinueContext(Identifier lbl)
      Get the destination context of a continue
    • getReturnContext

      public CheckContext getReturnContext()
      Get the destination context of a return (the method body)
    • getTryExitContext

      public CheckContext getTryExitContext()
      Get the context of the innermost surrounding try-block. Consider only try-blocks contained within the same method. (There could be others when searching from within a method of a local class, but they are irrelevant to our purpose.) This is used for recording DA/DU information preceding all abnormal transfers of control: break, continue, return, and throw.
    • getInlineContext

      Context getInlineContext()
      Get the nearest inlined context
    • getInlineMemberContext

      Context getInlineMemberContext(MemberDefinition field)
      Get the context of a field that is being inlined
    • removeAdditionalVars

      public final Vset removeAdditionalVars(Vset vset)
      Remove variables from the vset set that are no longer part of this context.
    • getVarNumber

      public final int getVarNumber()
    • getThisNumber

      public int getThisNumber()
      Return the number of the innermost current instance reference.
    • getField

      public final MemberDefinition getField()
      Return the field containing the present context.
    • newEnvironment

      public static Environment newEnvironment(Environment env, Context ctx)
      Extend an environment with the given context. The resulting environment behaves the same as the given one, except that resolveName() takes into account local class names in this context.