/*
 * Copyright (c) 2002, 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

// -*- C++ -*-
// Small program for unpacking specially compressed Java packages.
// John R. Rose

#include <sys/types.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>

#include "defines.h"
#include "bytes.h"
#include "utils.h"
#include "coding.h"
#include "bands.h"

#include "constants.h"
#include "unpack.h"

inline void band::abort(const char* msg) { u->abort(msg); }
inline bool band::aborting() { return u->aborting(); }

void band::readData(int expectedLength) {
  CHECK;
  assert(expectedLength >= 0);
  assert(vs[0].cmk == cmk_ERROR);
  if (expectedLength != 0) {
    assert(length == 0);
    length = expectedLength;
  }
  if (length == 0) {
    assert((rplimit = cm.vs0.rp = u->rp) != null);
    return;
  }
  assert(length > 0);

  bool is_BYTE1 = (defc->spec == BYTE1_spec);

  if (is_BYTE1) {
    // No possibility of coding change.  Sizing is exact.
    u->ensure_input(length);
  } else {
    // Make a conservatively generous estimate of band size in bytes.
    // Assume B == 5 everywhere.
    // Assume awkward pop with all {U} values (2*5 per value)
    jlong generous = (jlong) length * (B_MAX*3+1) + C_SLOP;
    u->ensure_input(generous);
  }

  // Read one value to see what it might be.
  int XB = _meta_default;
  int cp1 = 0, cp2 = 0;
  if (!is_BYTE1) {
    // must be a variable-length coding
    assert(defc->B() > 1 && defc->L() > 0);
    // must have already read from previous band:
    assert(bn >= BAND_LIMIT || bn <= 0
           || bn == e_cp_Utf8_big_chars
           || endsWith(name, "_lo")  // preceded by _hi conditional band
           || bn == e_file_options  // preceded by conditional band
           || u->rp == u->all_bands[bn-1].maxRP()
           || u->all_bands[bn-1].defc == null);

    value_stream xvs;
    coding* valc = defc;
    if (valc->D() != 0) {
      valc = coding::findBySpec(defc->B(), defc->H(), defc->S());
      assert(!valc->isMalloc);
    }
    xvs.init(u->rp, u->rplimit, valc);
    CHECK;
    int X = xvs.getInt();
    if (valc->S() != 0) {
      assert(valc->min <= -256);
      XB = -1-X;
    } else {
      int L = valc->L();
      assert(valc->max >= L+255);
      XB = X-L;
    }
    if (0 <= XB && XB < 256) {
      // Skip over the escape value.
      u->rp = xvs.rp;
      cp1 = 1;
    } else {
      // No, it's still default.
      XB = _meta_default;
    }
  }

  if (XB <= _meta_canon_max) {
    byte XB_byte = (byte) XB;
    byte* XB_ptr = &XB_byte;
    cm.init(u->rp, u->rplimit, XB_ptr, 0, defc, length, null);
    CHECK;
  } else {
    NOT_PRODUCT(byte* meta_rp0 = u->meta_rp);
    assert(u->meta_rp != null);
    // Scribble the initial byte onto the band.
    byte* save_meta_rp = --u->meta_rp;
    byte  save_meta_xb = (*save_meta_rp);
    (*save_meta_rp) = (byte) XB;
    cm.init(u->rp, u->rplimit, u->meta_rp, 0, defc, length, null);
    (*save_meta_rp) = save_meta_xb;  // put it back, just to be tidy
    NOT_PRODUCT(cp2 = (int)(u->meta_rp - meta_rp0));
  }
  rplimit = u->rp;

  rewind();

#ifndef PRODUCT
  PRINTCR((3,"readFrom %s at %p [%d values, %d bytes, cp=%d/%d]",
           (name?name:"(band)"), minRP(), length, size(), cp1, cp2));
  if (u->verbose_bands || u->verbose >= 4) dump();

  if (ix != null && u->verbose != 0 && length > 0) {
    // Check referential integrity early, for easier debugging.
    band saved = (*this);  // save state
    for (int i = 0; i < length; i++) {
      int n = vs[0].getInt() - nullOK;
      entry *ref = ix->get(n);
      assert(ref != null || n == -1);
    }
    (*this) = saved;
  }
#endif
}

#ifndef PRODUCT
void band::dump() {
  band saved = (*this);  // save state
  const char* b_name = name;
  char b_name_buf[100];
  if (b_name == null) {
    char* bp = &b_name_buf[0];
    b_name = bp;
    sprintf(bp, "#%d/%d", bn, le_kind); bp += strlen(bp);
    if (le_bci != 0)  { sprintf(bp, "/bci%d",  le_bci);  bp += strlen(bp); }
    if (le_back != 0) { sprintf(bp, "/back%d", le_back); bp += strlen(bp); }
    if (le_len != 0)  { sprintf(bp, "/len%d",  le_len);  bp += strlen(bp); }
  }
  fprintf(u->errstrm, "band %s[%d]%s", b_name, length, (length==0?"\n":" {"));
  if (length > 0) {
    for (int i = 0; i < length; i++) {
      const char* eol = (length > 10 && i % 10 == 0) ? "\n" : " ";
      fprintf(u->errstrm, "%s%d", eol, vs[0].getInt());
    }
    fprintf(u->errstrm, " }\n");
  }
  (*this) = saved;
}
#endif

void band::setIndex(cpindex* ix_) {
  assert(ix_ == null || ixTag == ix_->ixTag);
  ix = ix_;
}
void band::setIndexByTag(byte tag) {
  setIndex(u->cp.getIndex(tag));
}

entry* band::getRefCommon(cpindex* ix_, bool nullOKwithCaller) {
  CHECK_0;
  assert(ix_->ixTag == ixTag
         || (ixTag == CONSTANT_Literal
             && ix_->ixTag >= CONSTANT_Integer
             && ix_->ixTag <= CONSTANT_String));
  int n = vs[0].getInt() - nullOK;
  // Note: band-local nullOK means null encodes as 0.
  // But nullOKwithCaller means caller is willing to tolerate a null.
  entry *ref = ix_->get(n);
  if (ref == null && !(nullOKwithCaller && n == -1))
    abort(n == -1 ? "null ref" : "bad ref");
  return ref;
}

jlong band::getLong(band& lo_band, bool have_hi) {
  band& hi_band = (*this);
  assert(lo_band.bn == hi_band.bn + 1);
  uint lo = lo_band.getInt();
  if (!have_hi) {
    assert(hi_band.length == 0);
    return makeLong(0, lo);
  }
  uint hi = hi_band.getInt();
  return makeLong(hi, lo);
}

int band::getIntTotal() {
  CHECK_0;
  if (length == 0)  return 0;
  if (total_memo > 0)  return total_memo-1;
  int total = getInt();
  // overflow checks require that none of the addends are <0,
  // and that the partial sums never overflow (wrap negative)
  if (total < 0) {
    abort("overflow detected");
    return 0;
  }
  for (int k = length-1; k > 0; k--) {
    int prev_total = total;
    total += vs[0].getInt();
    if (total < prev_total) {
      abort("overflow detected");
      return 0;
    }
  }
  rewind();
  total_memo = total+1;
  return total;
}

int band::getIntCount(int tag) {
  CHECK_0;
  if (length == 0)  return 0;
  if (tag >= HIST0_MIN && tag <= HIST0_MAX) {
    if (hist0 == null) {
      // Lazily calculate an approximate histogram.
      hist0 = U_NEW(int, (HIST0_MAX - HIST0_MIN)+1);
      CHECK_0;
      for (int k = length; k > 0; k--) {
        int x = vs[0].getInt();
        if (x >= HIST0_MIN && x <= HIST0_MAX)
          hist0[x - HIST0_MIN] += 1;
      }
      rewind();
    }
    return hist0[tag - HIST0_MIN];
  }
  int total = 0;
  for (int k = length; k > 0; k--) {
    total += (vs[0].getInt() == tag) ? 1 : 0;
  }
  rewind();
  return total;
}

#define INDEX_INIT(tag, nullOK, subindex) \
        ((tag) + (subindex)*SUBINDEX_BIT + (nullOK)*256)

#define INDEX(tag)          INDEX_INIT(tag, 0, 0)
#define NULL_OR_INDEX(tag)  INDEX_INIT(tag, 1, 0)
#define SUB_INDEX(tag)      INDEX_INIT(tag, 0, 1)
#define NO_INDEX            0

struct band_init {
#ifndef PRODUCT
  int         bn;
  const char* name;
#endif
  int   defc;
  int   index;
};

#ifdef PRODUCT
#define BAND_INIT(name, cspec, ix) \
  { cspec, ix }
#else
#define BAND_INIT(name, cspec, ix) \
  { e_##name,  #name, /*debug only*/ \
    cspec, ix }
#endif

const band_init all_band_inits[] = {
//BAND_INIT(archive_magic, BYTE1_spec, 0),
//BAND_INIT(archive_header, UNSIGNED5_spec, 0),
//BAND_INIT(band_headers, BYTE1_spec, 0),
  BAND_INIT(cp_Utf8_prefix, DELTA5_spec, 0),
  BAND_INIT(cp_Utf8_suffix, UNSIGNED5_spec, 0),
  BAND_INIT(cp_Utf8_chars, CHAR3_spec, 0),
  BAND_INIT(cp_Utf8_big_suffix, DELTA5_spec, 0),
  BAND_INIT(cp_Utf8_big_chars, DELTA5_spec, 0),
  BAND_INIT(cp_Int, UDELTA5_spec, 0),
  BAND_INIT(cp_Float, UDELTA5_spec, 0),
  BAND_INIT(cp_Long_hi, UDELTA5_spec, 0),
  BAND_INIT(cp_Long_lo, DELTA5_spec, 0),
  BAND_INIT(cp_Double_hi, UDELTA5_spec, 0),
  BAND_INIT(cp_Double_lo, DELTA5_spec, 0),
  BAND_INIT(cp_String, UDELTA5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(cp_Class, UDELTA5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(cp_Signature_form, DELTA5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(cp_Signature_classes, UDELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(cp_Descr_name, DELTA5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(cp_Descr_type, UDELTA5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(cp_Field_class, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(cp_Field_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
  BAND_INIT(cp_Method_class, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(cp_Method_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
  BAND_INIT(cp_Imethod_class, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(cp_Imethod_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
  BAND_INIT(attr_definition_headers, BYTE1_spec, 0),
  BAND_INIT(attr_definition_name, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(attr_definition_layout, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(ic_this_class, UDELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(ic_flags, UNSIGNED5_spec, 0),
  BAND_INIT(ic_outer_class, DELTA5_spec, NULL_OR_INDEX(CONSTANT_Class)),
  BAND_INIT(ic_name, DELTA5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
  BAND_INIT(class_this, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(class_super, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(class_interface_count, DELTA5_spec, 0),
  BAND_INIT(class_interface, DELTA5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(class_field_count, DELTA5_spec, 0),
  BAND_INIT(class_method_count, DELTA5_spec, 0),
  BAND_INIT(field_descr, DELTA5_spec, INDEX(CONSTANT_NameandType)),
  BAND_INIT(field_flags_hi, UNSIGNED5_spec, 0),
  BAND_INIT(field_flags_lo, UNSIGNED5_spec, 0),
  BAND_INIT(field_attr_count, UNSIGNED5_spec, 0),
  BAND_INIT(field_attr_indexes, UNSIGNED5_spec, 0),
  BAND_INIT(field_attr_calls, UNSIGNED5_spec, 0),
  BAND_INIT(field_ConstantValue_KQ, UNSIGNED5_spec, INDEX(CONSTANT_Literal)),
  BAND_INIT(field_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(field_metadata_bands, -1, -1),
  BAND_INIT(field_attr_bands, -1, -1),
  BAND_INIT(method_descr, MDELTA5_spec, INDEX(CONSTANT_NameandType)),
  BAND_INIT(method_flags_hi, UNSIGNED5_spec, 0),
  BAND_INIT(method_flags_lo, UNSIGNED5_spec, 0),
  BAND_INIT(method_attr_count, UNSIGNED5_spec, 0),
  BAND_INIT(method_attr_indexes, UNSIGNED5_spec, 0),
  BAND_INIT(method_attr_calls, UNSIGNED5_spec, 0),
  BAND_INIT(method_Exceptions_N, UNSIGNED5_spec, 0),
  BAND_INIT(method_Exceptions_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(method_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(method_metadata_bands, -1, -1),
  BAND_INIT(method_attr_bands, -1, -1),
  BAND_INIT(class_flags_hi, UNSIGNED5_spec, 0),
  BAND_INIT(class_flags_lo, UNSIGNED5_spec, 0),
  BAND_INIT(class_attr_count, UNSIGNED5_spec, 0),
  BAND_INIT(class_attr_indexes, UNSIGNED5_spec, 0),
  BAND_INIT(class_attr_calls, UNSIGNED5_spec, 0),
  BAND_INIT(class_SourceFile_RUN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
  BAND_INIT(class_EnclosingMethod_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(class_EnclosingMethod_RDN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_NameandType)),
  BAND_INIT(class_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(class_metadata_bands, -1, -1),
  BAND_INIT(class_InnerClasses_N, UNSIGNED5_spec, 0),
  BAND_INIT(class_InnerClasses_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(class_InnerClasses_F, UNSIGNED5_spec, 0),
  BAND_INIT(class_InnerClasses_outer_RCN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
  BAND_INIT(class_InnerClasses_name_RUN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
  BAND_INIT(class_ClassFile_version_minor_H, UNSIGNED5_spec, 0),
  BAND_INIT(class_ClassFile_version_major_H, UNSIGNED5_spec, 0),
  BAND_INIT(class_attr_bands, -1, -1),
  BAND_INIT(code_headers, BYTE1_spec, 0),
  BAND_INIT(code_max_stack, UNSIGNED5_spec, 0),
  BAND_INIT(code_max_na_locals, UNSIGNED5_spec, 0),
  BAND_INIT(code_handler_count, UNSIGNED5_spec, 0),
  BAND_INIT(code_handler_start_P, BCI5_spec, 0),
  BAND_INIT(code_handler_end_PO, BRANCH5_spec, 0),
  BAND_INIT(code_handler_catch_PO, BRANCH5_spec, 0),
  BAND_INIT(code_handler_class_RCN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
  BAND_INIT(code_flags_hi, UNSIGNED5_spec, 0),
  BAND_INIT(code_flags_lo, UNSIGNED5_spec, 0),
  BAND_INIT(code_attr_count, UNSIGNED5_spec, 0),
  BAND_INIT(code_attr_indexes, UNSIGNED5_spec, 0),
  BAND_INIT(code_attr_calls, UNSIGNED5_spec, 0),
  BAND_INIT(code_StackMapTable_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_StackMapTable_frame_T, BYTE1_spec, 0),
  BAND_INIT(code_StackMapTable_local_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_StackMapTable_stack_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_StackMapTable_offset, UNSIGNED5_spec, 0),
  BAND_INIT(code_StackMapTable_T, BYTE1_spec, 0),
  BAND_INIT(code_StackMapTable_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
  BAND_INIT(code_StackMapTable_P, BCI5_spec, 0),
  BAND_INIT(code_LineNumberTable_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_LineNumberTable_bci_P, BCI5_spec, 0),
  BAND_INIT(code_LineNumberTable_line, UNSIGNED5_spec, 0),
  BAND_INIT(code_LocalVariableTable_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_LocalVariableTable_bci_P, BCI5_spec, 0),
  BAND_INIT(code_LocalVariableTable_span_O, BRANCH5_spec, 0),
  BAND_INIT(code_LocalVariableTable_name_RU, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(code_LocalVariableTable_type_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(code_LocalVariableTable_slot, UNSIGNED5_spec, 0),
  BAND_INIT(code_LocalVariableTypeTable_N, UNSIGNED5_spec, 0),
  BAND_INIT(code_LocalVariableTypeTable_bci_P, BCI5_spec, 0),
  BAND_INIT(code_LocalVariableTypeTable_span_O, BRANCH5_spec, 0),
  BAND_INIT(code_LocalVariableTypeTable_name_RU, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(code_LocalVariableTypeTable_type_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
  BAND_INIT(code_LocalVariableTypeTable_slot, UNSIGNED5_spec, 0),
  BAND_INIT(code_attr_bands, -1, -1),
  BAND_INIT(bc_codes, BYTE1_spec, 0),
  BAND_INIT(bc_case_count, UNSIGNED5_spec, 0),
  BAND_INIT(bc_case_value, DELTA5_spec, 0),
  BAND_INIT(bc_byte, BYTE1_spec, 0),
  BAND_INIT(bc_short, DELTA5_spec, 0),
  BAND_INIT(bc_local, UNSIGNED5_spec, 0),
  BAND_INIT(bc_label, BRANCH5_spec, 0),
  BAND_INIT(bc_intref, DELTA5_spec, INDEX(CONSTANT_Integer)),
  BAND_INIT(bc_floatref, DELTA5_spec, INDEX(CONSTANT_Float)),
  BAND_INIT(bc_longref, DELTA5_spec, INDEX(CONSTANT_Long)),
  BAND_INIT(bc_doubleref, DELTA5_spec, INDEX(CONSTANT_Double)),
  BAND_INIT(bc_stringref, DELTA5_spec, INDEX(CONSTANT_String)),
  BAND_INIT(bc_classref, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
  BAND_INIT(bc_fieldref, DELTA5_spec, INDEX(CONSTANT_Fieldref)),
  BAND_INIT(bc_methodref, UNSIGNED5_spec, INDEX(CONSTANT_Methodref)),
  BAND_INIT(bc_imethodref, DELTA5_spec, INDEX(CONSTANT_InterfaceMethodref)),
  BAND_INIT(bc_thisfield, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Fieldref)),
  BAND_INIT(bc_superfield, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Fieldref)),
  BAND_INIT(bc_thismethod, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
  BAND_INIT(bc_supermethod, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
  BAND_INIT(bc_initref, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
  BAND_INIT(bc_escref, UNSIGNED5_spec, INDEX(CONSTANT_All)),
  BAND_INIT(bc_escrefsize, UNSIGNED5_spec, 0),
  BAND_INIT(bc_escsize, UNSIGNED5_spec, 0),
  BAND_INIT(bc_escbyte, BYTE1_spec, 0),
  BAND_INIT(file_name, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
  BAND_INIT(file_size_hi, UNSIGNED5_spec, 0),
  BAND_INIT(file_size_lo, UNSIGNED5_spec, 0),
  BAND_INIT(file_modtime, DELTA5_spec, 0),
  BAND_INIT(file_options, UNSIGNED5_spec, 0),
//BAND_INIT(file_bits, BYTE1_spec, 0),
#ifndef PRODUCT
  { 0, 0, 0, 0 }
#else
  { 0, 0 }
#endif
};
#define NUM_BAND_INITS \
        (sizeof(all_band_inits)/sizeof(all_band_inits[0]))

band* band::makeBands(unpacker* u) {
  band* tmp_all_bands = U_NEW(band, BAND_LIMIT);
  for (int i = 0; i < BAND_LIMIT; i++) {
    assert((byte*)&all_band_inits[i+1]
           < (byte*)all_band_inits+sizeof(all_band_inits));
    const band_init& bi = all_band_inits[i];
    band&            b  = tmp_all_bands[i];
    coding*          defc = coding::findBySpec(bi.defc);
    assert((defc == null) == (bi.defc == -1));  // no garbage, please
    assert(defc == null || !defc->isMalloc);
    assert(bi.bn == i);  // band array consistent w/ band enum
    b.init(u, i, defc);
    if (bi.index > 0) {
      b.nullOK = ((bi.index >> 8) & 1);
      b.ixTag = (bi.index & 0xFF);
    }
#ifndef PRODUCT
    b.name = bi.name;
#endif
  }
  return tmp_all_bands;
}

void band::initIndexes(unpacker* u) {
  band* tmp_all_bands = u->all_bands;
  for (int i = 0; i < BAND_LIMIT; i++) {
    band* scan = &tmp_all_bands[i];
    uint tag = scan->ixTag;  // Cf. #define INDEX(tag) above
    if (tag != 0 && tag != CONSTANT_Literal && (tag & SUBINDEX_BIT) == 0) {
      scan->setIndex(u->cp.getIndex(tag));
    }
  }
}
