hotspot/src/share/vm/ci/ciStreams.cpp
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 1999-2005 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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#include "incls/_precompiled.incl"
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#include "incls/_ciStreams.cpp.incl"
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// ciExceptionHandlerStream
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//
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// Walk over some selected set of a methods exception handlers.
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// ------------------------------------------------------------------
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// ciExceptionHandlerStream::count
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//
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// How many exception handlers are there in this stream?
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//
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// Implementation note: Compiler2 needs this functionality, so I had
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int ciExceptionHandlerStream::count() {
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  int save_pos = _pos;
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  int save_end = _end;
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  int count = 0;
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  _pos = -1;
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  _end = _method->_handler_count;
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  next();
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  while (!is_done()) {
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    count++;
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    next();
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  }
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  _pos = save_pos;
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  _end = save_end;
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  return count;
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}
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int ciExceptionHandlerStream::count_remaining() {
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  int save_pos = _pos;
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  int save_end = _end;
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  int count = 0;
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  while (!is_done()) {
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    count++;
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    next();
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  }
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  _pos = save_pos;
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  _end = save_end;
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  return count;
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}
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// ciBytecodeStream
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//
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// The class is used to iterate over the bytecodes of a method.
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// It hides the details of constant pool structure/access by
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// providing accessors for constant pool items.
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// ------------------------------------------------------------------
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// ciBytecodeStream::wide
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//
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// Special handling for the wide bytcode
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Bytecodes::Code ciBytecodeStream::wide()
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{
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  // Get following bytecode; do not return wide
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  Bytecodes::Code bc = (Bytecodes::Code)_pc[1];
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  _pc += 2;                     // Skip both bytecodes
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  _pc += 2;                     // Skip index always
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  if( bc == Bytecodes::_iinc )
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    _pc += 2;                   // Skip optional constant
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  _was_wide = _pc;              // Flag last wide bytecode found
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  return bc;
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::table
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//
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// Special handling for switch ops
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Bytecodes::Code ciBytecodeStream::table( Bytecodes::Code bc ) {
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  switch( bc ) {                // Check for special bytecode handling
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  case Bytecodes::_lookupswitch:
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    _pc++;                      // Skip wide bytecode
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    _pc += (_start-_pc)&3;      // Word align
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    _table_base = (jint*)_pc;   // Capture for later usage
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                                // table_base[0] is default far_dest
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    // Table has 2 lead elements (default, length), then pairs of u4 values.
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    // So load table length, and compute address at end of table
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    _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];
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    break;
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  case Bytecodes::_tableswitch: {
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    _pc++;                      // Skip wide bytecode
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    _pc += (_start-_pc)&3;      // Word align
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    _table_base = (jint*)_pc;   // Capture for later usage
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                                // table_base[0] is default far_dest
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    int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound
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    int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound
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    int len = hi - lo + 1;      // Dense table size
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    _pc = (address)&_table_base[3+len]; // Skip past table
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    break;
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  }
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  default:
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    fatal("unhandled bytecode");
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  }
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  return bc;
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::reset_to_bci
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void ciBytecodeStream::reset_to_bci( int bci ) {
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  _bc_start=_was_wide=0;
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  _pc = _start+bci;
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::force_bci
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void ciBytecodeStream::force_bci(int bci) {
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  if (bci < 0) {
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    reset_to_bci(0);
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    _bc_start = _start + bci;
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    _bc = EOBC();
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  } else {
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    reset_to_bci(bci);
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    next();
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  }
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}
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// ------------------------------------------------------------------
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// Constant pool access
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// ------------------------------------------------------------------
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_klass_index
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//
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// If this bytecodes references a klass, return the index of the
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// referenced klass.
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int ciBytecodeStream::get_klass_index() const {
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  switch(cur_bc()) {
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  case Bytecodes::_ldc:
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    return get_index();
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  case Bytecodes::_ldc_w:
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  case Bytecodes::_ldc2_w:
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  case Bytecodes::_checkcast:
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  case Bytecodes::_instanceof:
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  case Bytecodes::_anewarray:
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  case Bytecodes::_multianewarray:
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  case Bytecodes::_new:
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  case Bytecodes::_newarray:
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    return get_index_big();
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  default:
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    ShouldNotReachHere();
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    return 0;
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  }
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_klass
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//
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// If this bytecode is a new, newarray, multianewarray, instanceof,
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// or checkcast, get the referenced klass.
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ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
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  return CURRENT_ENV->get_klass_by_index(_holder, get_klass_index(),
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                                         will_link);
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_constant_index
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//
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// If this bytecode is one of the ldc variants, get the index of the
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// referenced constant.
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int ciBytecodeStream::get_constant_index() const {
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  switch(cur_bc()) {
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  case Bytecodes::_ldc:
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    return get_index();
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  case Bytecodes::_ldc_w:
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  case Bytecodes::_ldc2_w:
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    return get_index_big();
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  default:
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    ShouldNotReachHere();
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    return 0;
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  }
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_constant
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//
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// If this bytecode is one of the ldc variants, get the referenced
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// constant.
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ciConstant ciBytecodeStream::get_constant() {
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  return CURRENT_ENV->get_constant_by_index(_holder, get_constant_index());
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}
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// ------------------------------------------------------------------
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bool ciBytecodeStream::is_unresolved_string() const {
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  return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index());
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}
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// ------------------------------------------------------------------
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bool ciBytecodeStream::is_unresolved_klass() const {
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  return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index());
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_field_index
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//
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// If this is a field access bytecode, get the constant pool
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// index of the referenced field.
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int ciBytecodeStream::get_field_index() {
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  assert(cur_bc() == Bytecodes::_getfield ||
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         cur_bc() == Bytecodes::_putfield ||
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         cur_bc() == Bytecodes::_getstatic ||
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         cur_bc() == Bytecodes::_putstatic, "wrong bc");
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  return get_index_big();
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_field
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//
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// If this bytecode is one of get_field, get_static, put_field,
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// or put_static, get the referenced field.
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ciField* ciBytecodeStream::get_field(bool& will_link) {
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  ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
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  will_link = f->will_link(_holder, _bc);
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  return f;
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_declared_field_holder
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//
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// Get the declared holder of the currently referenced field.
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//
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// Usage note: the holder() of a ciField class returns the canonical
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// holder of the field, rather than the holder declared in the
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// bytecodes.
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//
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// There is no "will_link" result passed back.  The user is responsible
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// for checking linkability when retrieving the associated field.
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ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
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  int holder_index = get_field_holder_index();
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  bool ignore;
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  return CURRENT_ENV->get_klass_by_index(_holder, holder_index, ignore)
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      ->as_instance_klass();
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_field_holder_index
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//
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// Get the constant pool index of the declared holder of the field
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// referenced by the current bytecode.  Used for generating
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// deoptimization information.
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int ciBytecodeStream::get_field_holder_index() {
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  VM_ENTRY_MARK;
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  constantPoolOop cpool = _holder->get_instanceKlass()->constants();
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  return cpool->klass_ref_index_at(get_field_index());
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_field_signature_index
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//
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// Get the constant pool index of the signature of the field
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// referenced by the current bytecode.  Used for generating
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// deoptimization information.
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int ciBytecodeStream::get_field_signature_index() {
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  VM_ENTRY_MARK;
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  constantPoolOop cpool = _holder->get_instanceKlass()->constants();
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  int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
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  return cpool->signature_ref_index_at(nt_index);
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_method_index
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//
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// If this is a method invocation bytecode, get the constant pool
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// index of the invoked method.
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int ciBytecodeStream::get_method_index() {
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  switch (cur_bc()) {
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  case Bytecodes::_invokeinterface:
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    return Bytes::get_Java_u2(_pc-4);
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  case Bytecodes::_invokevirtual:
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  case Bytecodes::_invokespecial:
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  case Bytecodes::_invokestatic:
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    return get_index_big();
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  default:
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    ShouldNotReachHere();
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    return 0;
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  }
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_method
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//
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// If this is a method invocation bytecode, get the invoked method.
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ciMethod* ciBytecodeStream::get_method(bool& will_link) {
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  ciMethod* m = CURRENT_ENV->get_method_by_index(_holder, get_method_index(),cur_bc());
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  will_link = m->is_loaded();
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  return m;
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_declared_method_holder
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//
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// Get the declared holder of the currently referenced method.
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//
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// Usage note: the holder() of a ciMethod class returns the canonical
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// holder of the method, rather than the holder declared in the
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// bytecodes.
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//
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// There is no "will_link" result passed back.  The user is responsible
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// for checking linkability when retrieving the associated method.
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ciKlass* ciBytecodeStream::get_declared_method_holder() {
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  bool ignore;
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  return CURRENT_ENV->get_klass_by_index(_holder, get_method_holder_index(), ignore);
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_method_holder_index
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//
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// Get the constant pool index of the declared holder of the method
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// referenced by the current bytecode.  Used for generating
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// deoptimization information.
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int ciBytecodeStream::get_method_holder_index() {
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  VM_ENTRY_MARK;
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  constantPoolOop cpool = _holder->get_instanceKlass()->constants();
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  return cpool->klass_ref_index_at(get_method_index());
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}
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// ------------------------------------------------------------------
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// ciBytecodeStream::get_method_signature_index
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//
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// Get the constant pool index of the signature of the method
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// referenced by the current bytecode.  Used for generating
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// deoptimization information.
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   361
int ciBytecodeStream::get_method_signature_index() {
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  VM_ENTRY_MARK;
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  constantPoolOop cpool = _holder->get_instanceKlass()->constants();
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  int method_index = get_method_index();
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  int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
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  return cpool->signature_ref_index_at(name_and_type_index);
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}