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