Mercurial > hg > truffle
annotate src/share/vm/interpreter/bytecodeStream.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | e9ff18c4ace7 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1579 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // A BytecodeStream is used for fast iteration over the bytecodes | |
| 26 // of a methodOop. | |
| 27 // | |
| 28 // Usage: | |
| 29 // | |
| 30 // BytecodeStream s(method); | |
| 31 // Bytecodes::Code c; | |
| 32 // while ((c = s.next()) >= 0) { | |
| 33 // ... | |
| 34 // } | |
| 1565 | 35 |
| 0 | 36 // A RawBytecodeStream is a simple version of BytecodeStream. |
| 37 // It is used ONLY when we know the bytecodes haven't been rewritten | |
| 1565 | 38 // yet, such as in the rewriter or the verifier. |
| 0 | 39 |
| 1565 | 40 // Here is the common base class for both RawBytecodeStream and BytecodeStream: |
| 41 class BaseBytecodeStream: StackObj { | |
| 0 | 42 protected: |
| 43 // stream buffer | |
| 44 methodHandle _method; // read from method directly | |
| 45 | |
| 46 // reading position | |
| 47 int _bci; // bci if current bytecode | |
| 48 int _next_bci; // bci of next bytecode | |
| 49 int _end_bci; // bci after the current iteration interval | |
| 50 | |
| 51 // last bytecode read | |
| 1565 | 52 Bytecodes::Code _raw_code; |
| 0 | 53 bool _is_wide; |
| 1565 | 54 bool _is_raw; // false in 'cooked' BytecodeStream |
| 55 | |
| 56 // Construction | |
| 57 BaseBytecodeStream(methodHandle method) : _method(method) { | |
| 58 set_interval(0, _method->code_size()); | |
| 59 _is_raw = false; | |
| 60 } | |
| 0 | 61 |
| 62 public: | |
| 63 // Iteration control | |
| 64 void set_interval(int beg_bci, int end_bci) { | |
| 65 // iterate over the interval [beg_bci, end_bci) | |
| 66 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci"); | |
| 67 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci"); | |
| 68 // setup of iteration pointers | |
| 69 _bci = beg_bci; | |
| 70 _next_bci = beg_bci; | |
| 71 _end_bci = end_bci; | |
| 72 } | |
| 73 void set_start (int beg_bci) { | |
| 74 set_interval(beg_bci, _method->code_size()); | |
| 75 } | |
| 76 | |
| 1565 | 77 bool is_raw() const { return _is_raw; } |
| 78 | |
| 79 // Stream attributes | |
| 80 methodHandle method() const { return _method; } | |
| 81 | |
| 82 int bci() const { return _bci; } | |
| 83 int next_bci() const { return _next_bci; } | |
| 84 int end_bci() const { return _end_bci; } | |
| 85 | |
| 86 Bytecodes::Code raw_code() const { return _raw_code; } | |
| 87 bool is_wide() const { return _is_wide; } | |
| 88 int instruction_size() const { return (_next_bci - _bci); } | |
| 89 bool is_last_bytecode() const { return _next_bci >= _end_bci; } | |
| 90 | |
| 91 address bcp() const { return method()->code_base() + _bci; } | |
| 92 Bytecode* bytecode() const { return Bytecode_at(bcp()); } | |
| 93 | |
| 94 // State changes | |
| 95 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } | |
| 96 | |
| 97 // Bytecode-specific attributes | |
| 98 int dest() const { return bci() + bytecode()->get_offset_s2(raw_code()); } | |
| 99 int dest_w() const { return bci() + bytecode()->get_offset_s4(raw_code()); } | |
| 100 | |
| 101 // One-byte indices. | |
| 102 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } | |
| 103 | |
| 104 protected: | |
| 105 void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; | |
| 106 void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; | |
| 107 }; | |
| 108 | |
| 109 class RawBytecodeStream: public BaseBytecodeStream { | |
| 110 public: | |
| 111 // Construction | |
| 112 RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) { | |
| 113 _is_raw = true; | |
| 114 } | |
| 115 | |
| 116 public: | |
| 0 | 117 // Iteration |
| 118 // Use raw_next() rather than next() for faster method reference | |
| 119 Bytecodes::Code raw_next() { | |
| 120 Bytecodes::Code code; | |
| 121 // set reading position | |
| 122 _bci = _next_bci; | |
| 123 assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); | |
| 124 | |
| 1565 | 125 address bcp = this->bcp(); |
| 0 | 126 code = Bytecodes::code_or_bp_at(bcp); |
| 127 | |
| 128 // set next bytecode position | |
| 129 int l = Bytecodes::length_for(code); | |
| 130 if (l > 0 && (_bci + l) <= _end_bci) { | |
| 131 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch | |
| 132 && code != Bytecodes::_lookupswitch, "can't be special bytecode"); | |
| 133 _is_wide = false; | |
| 134 _next_bci += l; | |
| 1565 | 135 _raw_code = code; |
| 0 | 136 return code; |
| 137 } else { | |
| 138 return raw_next_special(code); | |
| 139 } | |
| 140 } | |
| 141 Bytecodes::Code raw_next_special(Bytecodes::Code code); | |
| 142 | |
| 1565 | 143 // Unsigned indices, widening, with no swapping of bytes |
| 144 int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); } | |
| 145 // Get an unsigned 2-byte index, with no swapping of bytes. | |
| 146 int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); } | |
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147 |
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148 private: |
| 1565 | 149 int get_index_u2_raw(address p) const { |
| 150 assert_raw_index_size(2); assert_raw_stream(true); | |
| 151 return Bytes::get_Java_u2(p); | |
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152 } |
| 0 | 153 }; |
| 154 | |
| 155 // In BytecodeStream, non-java bytecodes will be translated into the | |
| 156 // corresponding java bytecodes. | |
| 157 | |
| 1565 | 158 class BytecodeStream: public BaseBytecodeStream { |
| 159 Bytecodes::Code _code; | |
| 160 | |
| 0 | 161 public: |
| 162 // Construction | |
| 1565 | 163 BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { } |
| 0 | 164 |
| 165 // Iteration | |
| 166 Bytecodes::Code next() { | |
| 1565 | 167 Bytecodes::Code raw_code, code; |
| 0 | 168 // set reading position |
| 169 _bci = _next_bci; | |
| 170 if (is_last_bytecode()) { | |
| 171 // indicate end of bytecode stream | |
| 1565 | 172 raw_code = code = Bytecodes::_illegal; |
| 0 | 173 } else { |
| 174 // get bytecode | |
| 1565 | 175 address bcp = this->bcp(); |
| 176 raw_code = Bytecodes::code_at(bcp); | |
| 177 code = Bytecodes::java_code(raw_code); | |
| 0 | 178 // set next bytecode position |
| 179 // | |
| 180 // note that we cannot advance before having the | |
| 181 // tty bytecode otherwise the stepping is wrong! | |
| 182 // (carefull: length_for(...) must be used first!) | |
| 183 int l = Bytecodes::length_for(code); | |
| 184 if (l == 0) l = Bytecodes::length_at(bcp); | |
| 185 _next_bci += l; | |
| 186 assert(_bci < _next_bci, "length must be > 0"); | |
| 187 // set attributes | |
| 188 _is_wide = false; | |
| 189 // check for special (uncommon) cases | |
| 190 if (code == Bytecodes::_wide) { | |
| 1565 | 191 raw_code = (Bytecodes::Code)bcp[1]; |
| 192 code = raw_code; // wide BCs are always Java-normal | |
| 0 | 193 _is_wide = true; |
| 194 } | |
| 195 assert(Bytecodes::is_java_code(code), "sanity check"); | |
| 196 } | |
| 1565 | 197 _raw_code = raw_code; |
| 0 | 198 _code = code; |
| 199 return _code; | |
| 200 } | |
| 201 | |
| 202 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } | |
| 1565 | 203 Bytecodes::Code code() const { return _code; } |
| 204 | |
| 205 // Unsigned indices, widening | |
| 206 int get_index() const { return is_wide() ? bytecode()->get_index_u2(raw_code(), true) : get_index_u1(); } | |
| 207 // Get an unsigned 2-byte index, swapping the bytes if necessary. | |
| 208 int get_index_u2() const { assert_raw_stream(false); | |
| 209 return bytecode()->get_index_u2(raw_code(), false); } | |
| 210 // Get an unsigned 2-byte index in native order. | |
| 211 int get_index_u2_cpcache() const { assert_raw_stream(false); | |
| 212 return bytecode()->get_index_u2_cpcache(raw_code()); } | |
| 213 int get_index_u4() const { assert_raw_stream(false); | |
| 214 return bytecode()->get_index_u4(raw_code()); } | |
| 1570 | 215 bool has_index_u4() const { return bytecode()->has_index_u4(raw_code()); } |
| 0 | 216 }; |