1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "interpreter/bytecodeStream.hpp" 27 #include "interpreter/bytecodes.hpp" 28 29 Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) { 30 assert(!is_last_bytecode(), "should have been checked"); 31 // set next bytecode position 32 address bcp = RawBytecodeStream::bcp(); 33 address end = method()->code_base() + end_bci(); 34 int len = Bytecodes::raw_special_length_at(bcp, end); 35 // Very large tableswitch or lookupswitch size can cause _next_bci to overflow. 36 if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) { 37 code = Bytecodes::_illegal; 38 } else { 39 _next_bci += len; 40 // set attributes 41 _is_wide = false; 42 // check for special (uncommon) cases 43 if (code == Bytecodes::_wide) { 44 if (bcp + 1 >= end) { 45 code = Bytecodes::_illegal; 46 } else { 47 code = (Bytecodes::Code)bcp[1]; 48 _is_wide = true; 49 } 50 } 51 } 52 _raw_code = code; 53 return code; 54 } 55 56 #ifdef ASSERT 57 void BaseBytecodeStream::assert_raw_index_size(int size) const { 58 if (raw_code() == Bytecodes::_invokedynamic && is_raw()) { 59 // in raw mode, pretend indy is "bJJ__" 60 assert(size == 2, "raw invokedynamic instruction has 2-byte index only"); 61 } else { 62 bytecode().assert_index_size(size, raw_code(), is_wide()); 63 } 64 } 65 66 void BaseBytecodeStream::assert_raw_stream(bool want_raw) const { 67 if (want_raw) { 68 assert( is_raw(), "this function only works on raw streams"); 69 } else { 70 assert(!is_raw(), "this function only works on non-raw streams"); 71 } 72 } 73 #endif //ASSERT