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This is the verbatim text of the labelSet.h include file.
/* Sun-$Revision: 23.3 $ */

/* Copyright 1992-9 Sun Microsystems, Inc. and Stanford University.
   See the LICENSE file for license information. */

# pragma interface

// I implement a set for recording the defined labels.
// Then with parallel arrays, I store stack_depths and pcs for code generation.
// Right now this is a very slow set.

struct LabelInfo: public ResourceObj {
  oop label;
  int32 stack_depth;
  int32 bci;
  int32 literalIndex;
  bool isDefined;
  LabelInfo(oop l, int32 sd, int32 b, int32 li) : ResourceObj() {
    label= l;  stack_depth= sd;  bci= b;  literalIndex= li;
    isDefined = false;

enum LabelOccurrence {
  defineLabel, simpleBranch, indexedBranch

class AbstractByteCode;

class LabelSet: public ResourceObj {
  // instance variables
  LabelInfo**   labels;
  int32 index;
  int32 maxIndex;

  // constructor
  LabelInfo* at( oop label);
  int32 RecordLabelInfo( AbstractByteCode* b, oop label, int32 sd, 
                         LabelOccurrence why,  int32 bci);
  int32 RecordLabelVectorInfo( AbstractByteCode* b, objVectorOop labels,
                               int32 sd, int32 bci);
  bool ResolveLabel( AbstractByteCode* b, oop lbl, objVectorOop pcs, int32 i);

  // preserve operation
  void oops_do(oopsDoFn f);
  void resort() {} /* would be real if I were faster */
  void grow();
  void allocateArrays() {
    labels= NEW_RESOURCE_ARRAY(LabelInfo*,   maxIndex); 

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