34 
  35 
  36 /**
  37  * Bytecode Assembler
  38  *
  39  * These classes are used to synthesize code for creating new methods from
  40  * within the VM.  This is only a partial implementation of an assembler;
  41  * only the bytecodes that are needed by clients are implemented at this time.
  42  * This is used during default method analysis to create overpass methods
  43  * and add them to a call during parsing.  Other uses (such as creating
  44  * bridges) may come later.  Any missing bytecodes can be implemented on an
  45  * as-need basis.
  46  */
  47 
  48 class BytecodeBuffer : public GrowableArray<u1> {
  49  public:
  50   BytecodeBuffer() : GrowableArray<u1>(20) {}
  51 };
  52 
  53 // Entries in a yet-to-be-created constant pool.  Limited types for now.
  54 class BytecodeCPEntry VALUE_OBJ_CLASS_SPEC {
  55  public:
  56   enum tag {
  57     ERROR_TAG,
  58     UTF8,
  59     KLASS,
  60     STRING,
  61     NAME_AND_TYPE,
  62     METHODREF
  63   };
  64 
  65   u1 _tag;
  66   union {
  67     Symbol* utf8;
  68     u2 klass;
  69     u2 string;
  70     struct {
  71       u2 name_index;
  72       u2 type_index;
  73     } name_and_type;
  74     struct {

  34 
  35 
  36 /**
  37  * Bytecode Assembler
  38  *
  39  * These classes are used to synthesize code for creating new methods from
  40  * within the VM.  This is only a partial implementation of an assembler;
  41  * only the bytecodes that are needed by clients are implemented at this time.
  42  * This is used during default method analysis to create overpass methods
  43  * and add them to a call during parsing.  Other uses (such as creating
  44  * bridges) may come later.  Any missing bytecodes can be implemented on an
  45  * as-need basis.
  46  */
  47 
  48 class BytecodeBuffer : public GrowableArray<u1> {
  49  public:
  50   BytecodeBuffer() : GrowableArray<u1>(20) {}
  51 };
  52 
  53 // Entries in a yet-to-be-created constant pool.  Limited types for now.
  54 class BytecodeCPEntry {
  55  public:
  56   enum tag {
  57     ERROR_TAG,
  58     UTF8,
  59     KLASS,
  60     STRING,
  61     NAME_AND_TYPE,
  62     METHODREF
  63   };
  64 
  65   u1 _tag;
  66   union {
  67     Symbol* utf8;
  68     u2 klass;
  69     u2 string;
  70     struct {
  71       u2 name_index;
  72       u2 type_index;
  73     } name_and_type;
  74     struct {