jdk8-mips64-public/hotspot: src/share/vm/interpreter/bytecodeStream.hpp@8012aa3ccede (annotated)

src/share/vm/interpreter/bytecodeStream.hpp@8012aa3ccede (annotated)

src/share/vm/interpreter/bytecodeStream.hpp

Thu, 13 Jan 2011 22:15:41 -0800

author: never
date: Thu, 13 Jan 2011 22:15:41 -0800
changeset 2462: 8012aa3ccede
parent 2314: f95d63e2154a
child 2508: b92c45f2bc75
permissions: -rw-r--r--

4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed

 /*
  * Copyright (c) 1997, 2011, 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.
  *
  * 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.
  *
  */
 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
 #include "interpreter/bytecode.hpp"
 #include "memory/allocation.hpp"
 #include "oops/methodOop.hpp"
 #ifdef TARGET_ARCH_x86
 # include "bytes_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "bytes_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "bytes_zero.hpp"
 #endif
 // A BytecodeStream is used for fast iteration over the bytecodes
 // of a methodOop.
 //
 // Usage:
 //
 // BytecodeStream s(method);
 // Bytecodes::Code c;
 // while ((c = s.next()) >= 0) {
 //   ...
 // }
 // A RawBytecodeStream is a simple version of BytecodeStream.
 // It is used ONLY when we know the bytecodes haven't been rewritten
 // yet, such as in the rewriter or the verifier.
 // Here is the common base class for both RawBytecodeStream and BytecodeStream:
 class BaseBytecodeStream: StackObj {
  protected:
   // stream buffer
   methodHandle    _method;                       // read from method directly
   // reading position
   int             _bci;                          // bci if current bytecode
   int             _next_bci;                     // bci of next bytecode
   int             _end_bci;                      // bci after the current iteration interval
   // last bytecode read
   Bytecodes::Code _raw_code;
   bool            _is_wide;
   bool            _is_raw;                       // false in 'cooked' BytecodeStream
   // Construction
   BaseBytecodeStream(methodHandle method) : _method(method) {
     set_interval(0, _method->code_size());
     _is_raw = false;
   }
  public:
   // Iteration control
   void set_interval(int beg_bci, int end_bci) {
     // iterate over the interval [beg_bci, end_bci)
     assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci");
     assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci");
     // setup of iteration pointers
     _bci      = beg_bci;
     _next_bci = beg_bci;
     _end_bci  = end_bci;
   }
   void set_start   (int beg_bci) {
     set_interval(beg_bci, _method->code_size());
   }
   bool is_raw() const { return _is_raw; }
   // Stream attributes
   methodHandle    method() const                 { return _method; }
   int             bci() const                    { return _bci; }
   int             next_bci() const               { return _next_bci; }
   int             end_bci() const                { return _end_bci; }
   Bytecodes::Code raw_code() const               { return _raw_code; }
   bool            is_wide() const                { return _is_wide; }
   int             instruction_size() const       { return (_next_bci - _bci); }
   bool            is_last_bytecode() const       { return _next_bci >= _end_bci; }
   address         bcp() const                    { return method()->code_base() + _bci; }
   Bytecode        bytecode() const               { return Bytecode(_method(), bcp()); }
   // State changes
   void            set_next_bci(int bci)          { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }
   // Bytecode-specific attributes
   int             dest() const                   { return bci() + bytecode().get_offset_s2(raw_code()); }
   int             dest_w() const                 { return bci() + bytecode().get_offset_s4(raw_code()); }
   // One-byte indices.
   int             get_index_u1() const           { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); }
  protected:
   void assert_raw_index_size(int size) const NOT_DEBUG_RETURN;
   void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN;
 };
 class RawBytecodeStream: public BaseBytecodeStream {
  public:
   // Construction
   RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) {
     _is_raw = true;
   }
  public:
   // Iteration
   // Use raw_next() rather than next() for faster method reference
   Bytecodes::Code raw_next() {
     Bytecodes::Code code;
     // set reading position
     _bci = _next_bci;
     assert(!is_last_bytecode(), "caller should check is_last_bytecode()");
     address bcp = this->bcp();
     code        = Bytecodes::code_or_bp_at(bcp);
     // set next bytecode position
     int l = Bytecodes::length_for(code);
     if (l > 0 && (_bci + l) <= _end_bci) {
       assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch
              && code != Bytecodes::_lookupswitch, "can't be special bytecode");
       _is_wide = false;
       _next_bci += l;
       _raw_code = code;
       return code;
     } else {
       return raw_next_special(code);
     }
   }
   Bytecodes::Code raw_next_special(Bytecodes::Code code);
   // Unsigned indices, widening, with no swapping of bytes
   int             get_index() const          { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); }
   // Get an unsigned 2-byte index, with no swapping of bytes.
   int             get_index_u2() const       { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1);  }
  private:
   int get_index_u2_raw(address p) const {
     assert_raw_index_size(2); assert_raw_stream(true);
     return Bytes::get_Java_u2(p);
   }
 };
 // In BytecodeStream, non-java bytecodes will be translated into the
 // corresponding java bytecodes.
 class BytecodeStream: public BaseBytecodeStream {
   Bytecodes::Code _code;
  public:
   // Construction
   BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { }
   // Iteration
   Bytecodes::Code next() {
     Bytecodes::Code raw_code, code;
     // set reading position
     _bci = _next_bci;
     if (is_last_bytecode()) {
       // indicate end of bytecode stream
       raw_code = code = Bytecodes::_illegal;
     } else {
       // get bytecode
       address bcp = this->bcp();
       raw_code = Bytecodes::code_at(_method(), bcp);
       code = Bytecodes::java_code(raw_code);
       // set next bytecode position
       //
       // note that we cannot advance before having the
       // tty bytecode otherwise the stepping is wrong!
       // (carefull: length_for(...) must be used first!)
       int l = Bytecodes::length_for(code);
       if (l == 0) l = Bytecodes::length_at(_method(), bcp);
       _next_bci  += l;
       assert(_bci < _next_bci, "length must be > 0");
       // set attributes
       _is_wide      = false;
       // check for special (uncommon) cases
       if (code == Bytecodes::_wide) {
         raw_code = (Bytecodes::Code)bcp[1];
         code = raw_code;  // wide BCs are always Java-normal
         _is_wide = true;
       }
       assert(Bytecodes::is_java_code(code), "sanity check");
     }
     _raw_code = raw_code;
     _code = code;
     return _code;
   }
   bool            is_active_breakpoint() const   { return Bytecodes::is_active_breakpoint_at(bcp()); }
   Bytecodes::Code code() const                   { return _code; }
   // Unsigned indices, widening
   int             get_index() const              { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); }
   // Get an unsigned 2-byte index, swapping the bytes if necessary.
   int             get_index_u2() const           { assert_raw_stream(false);
                                                    return bytecode().get_index_u2(raw_code(), false); }
   // Get an unsigned 2-byte index in native order.
   int             get_index_u2_cpcache() const   { assert_raw_stream(false);
                                                    return bytecode().get_index_u2_cpcache(raw_code()); }
   int             get_index_u4() const           { assert_raw_stream(false);
                                                    return bytecode().get_index_u4(raw_code()); }
   bool            has_index_u4() const           { return bytecode().has_index_u4(raw_code()); }
 };
 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/interpreter/bytecodeStream.hpp@8012aa3ccede (annotated)

src/share/vm/interpreter/bytecodeStream.hpp