Mercurial > hg > truffle
annotate src/share/vm/interpreter/bytecodeStream.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | b92c45f2bc75 |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 | |
| 1972 | 25 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP |
| 26 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP | |
| 27 | |
| 28 #include "interpreter/bytecode.hpp" | |
| 29 #include "memory/allocation.hpp" | |
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30 #include "oops/method.hpp" |
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31 #include "runtime/handles.inline.hpp" |
| 1972 | 32 #ifdef TARGET_ARCH_x86 |
| 33 # include "bytes_x86.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_ARCH_sparc | |
| 36 # include "bytes_sparc.hpp" | |
| 37 #endif | |
| 38 #ifdef TARGET_ARCH_zero | |
| 39 # include "bytes_zero.hpp" | |
| 40 #endif | |
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41 #ifdef TARGET_ARCH_arm |
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42 # include "bytes_arm.hpp" |
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43 #endif |
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44 #ifdef TARGET_ARCH_ppc |
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45 # include "bytes_ppc.hpp" |
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46 #endif |
| 1972 | 47 |
| 0 | 48 // A BytecodeStream is used for fast iteration over the bytecodes |
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49 // of a Method*. |
| 0 | 50 // |
| 51 // Usage: | |
| 52 // | |
| 53 // BytecodeStream s(method); | |
| 54 // Bytecodes::Code c; | |
| 55 // while ((c = s.next()) >= 0) { | |
| 56 // ... | |
| 57 // } | |
| 1565 | 58 |
| 0 | 59 // A RawBytecodeStream is a simple version of BytecodeStream. |
| 60 // It is used ONLY when we know the bytecodes haven't been rewritten | |
| 1565 | 61 // yet, such as in the rewriter or the verifier. |
| 0 | 62 |
| 1565 | 63 // Here is the common base class for both RawBytecodeStream and BytecodeStream: |
| 64 class BaseBytecodeStream: StackObj { | |
| 0 | 65 protected: |
| 66 // stream buffer | |
| 67 methodHandle _method; // read from method directly | |
| 68 | |
| 69 // reading position | |
| 70 int _bci; // bci if current bytecode | |
| 71 int _next_bci; // bci of next bytecode | |
| 72 int _end_bci; // bci after the current iteration interval | |
| 73 | |
| 74 // last bytecode read | |
| 1565 | 75 Bytecodes::Code _raw_code; |
| 0 | 76 bool _is_wide; |
| 1565 | 77 bool _is_raw; // false in 'cooked' BytecodeStream |
| 78 | |
| 79 // Construction | |
| 80 BaseBytecodeStream(methodHandle method) : _method(method) { | |
| 81 set_interval(0, _method->code_size()); | |
| 82 _is_raw = false; | |
| 83 } | |
| 0 | 84 |
| 85 public: | |
| 86 // Iteration control | |
| 87 void set_interval(int beg_bci, int end_bci) { | |
| 88 // iterate over the interval [beg_bci, end_bci) | |
| 89 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci"); | |
| 90 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci"); | |
| 91 // setup of iteration pointers | |
| 92 _bci = beg_bci; | |
| 93 _next_bci = beg_bci; | |
| 94 _end_bci = end_bci; | |
| 95 } | |
| 96 void set_start (int beg_bci) { | |
| 97 set_interval(beg_bci, _method->code_size()); | |
| 98 } | |
| 99 | |
| 1565 | 100 bool is_raw() const { return _is_raw; } |
| 101 | |
| 102 // Stream attributes | |
| 103 methodHandle method() const { return _method; } | |
| 104 | |
| 105 int bci() const { return _bci; } | |
| 106 int next_bci() const { return _next_bci; } | |
| 107 int end_bci() const { return _end_bci; } | |
| 108 | |
| 109 Bytecodes::Code raw_code() const { return _raw_code; } | |
| 110 bool is_wide() const { return _is_wide; } | |
| 111 int instruction_size() const { return (_next_bci - _bci); } | |
| 112 bool is_last_bytecode() const { return _next_bci >= _end_bci; } | |
| 113 | |
| 114 address bcp() const { return method()->code_base() + _bci; } | |
| 2142 | 115 Bytecode bytecode() const { return Bytecode(_method(), bcp()); } |
| 1565 | 116 |
| 117 // State changes | |
| 118 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } | |
| 119 | |
| 120 // Bytecode-specific attributes | |
| 2142 | 121 int dest() const { return bci() + bytecode().get_offset_s2(raw_code()); } |
| 122 int dest_w() const { return bci() + bytecode().get_offset_s4(raw_code()); } | |
| 1565 | 123 |
| 124 // One-byte indices. | |
| 125 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } | |
| 126 | |
| 127 protected: | |
| 128 void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; | |
| 129 void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; | |
| 130 }; | |
| 131 | |
| 132 class RawBytecodeStream: public BaseBytecodeStream { | |
| 133 public: | |
| 134 // Construction | |
| 135 RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) { | |
| 136 _is_raw = true; | |
| 137 } | |
| 138 | |
| 139 public: | |
| 0 | 140 // Iteration |
| 141 // Use raw_next() rather than next() for faster method reference | |
| 142 Bytecodes::Code raw_next() { | |
| 143 Bytecodes::Code code; | |
| 144 // set reading position | |
| 145 _bci = _next_bci; | |
| 146 assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); | |
| 147 | |
| 1565 | 148 address bcp = this->bcp(); |
| 0 | 149 code = Bytecodes::code_or_bp_at(bcp); |
| 150 | |
| 151 // set next bytecode position | |
| 152 int l = Bytecodes::length_for(code); | |
| 153 if (l > 0 && (_bci + l) <= _end_bci) { | |
| 154 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch | |
| 155 && code != Bytecodes::_lookupswitch, "can't be special bytecode"); | |
| 156 _is_wide = false; | |
| 157 _next_bci += l; | |
| 1565 | 158 _raw_code = code; |
| 0 | 159 return code; |
| 160 } else { | |
| 161 return raw_next_special(code); | |
| 162 } | |
| 163 } | |
| 164 Bytecodes::Code raw_next_special(Bytecodes::Code code); | |
| 165 | |
| 1565 | 166 // Unsigned indices, widening, with no swapping of bytes |
| 167 int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); } | |
| 168 // Get an unsigned 2-byte index, with no swapping of bytes. | |
| 169 int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); } | |
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170 |
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171 private: |
| 1565 | 172 int get_index_u2_raw(address p) const { |
| 173 assert_raw_index_size(2); assert_raw_stream(true); | |
| 174 return Bytes::get_Java_u2(p); | |
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175 } |
| 0 | 176 }; |
| 177 | |
| 178 // In BytecodeStream, non-java bytecodes will be translated into the | |
| 179 // corresponding java bytecodes. | |
| 180 | |
| 1565 | 181 class BytecodeStream: public BaseBytecodeStream { |
| 182 Bytecodes::Code _code; | |
| 183 | |
| 0 | 184 public: |
| 185 // Construction | |
| 1565 | 186 BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { } |
| 0 | 187 |
| 188 // Iteration | |
| 189 Bytecodes::Code next() { | |
| 1565 | 190 Bytecodes::Code raw_code, code; |
| 0 | 191 // set reading position |
| 192 _bci = _next_bci; | |
| 193 if (is_last_bytecode()) { | |
| 194 // indicate end of bytecode stream | |
| 1565 | 195 raw_code = code = Bytecodes::_illegal; |
| 0 | 196 } else { |
| 197 // get bytecode | |
| 1565 | 198 address bcp = this->bcp(); |
| 2142 | 199 raw_code = Bytecodes::code_at(_method(), bcp); |
| 1565 | 200 code = Bytecodes::java_code(raw_code); |
| 0 | 201 // set next bytecode position |
| 202 // | |
| 203 // note that we cannot advance before having the | |
| 204 // tty bytecode otherwise the stepping is wrong! | |
| 205 // (carefull: length_for(...) must be used first!) | |
| 206 int l = Bytecodes::length_for(code); | |
| 2142 | 207 if (l == 0) l = Bytecodes::length_at(_method(), bcp); |
| 0 | 208 _next_bci += l; |
| 209 assert(_bci < _next_bci, "length must be > 0"); | |
| 210 // set attributes | |
| 211 _is_wide = false; | |
| 212 // check for special (uncommon) cases | |
| 213 if (code == Bytecodes::_wide) { | |
| 1565 | 214 raw_code = (Bytecodes::Code)bcp[1]; |
| 215 code = raw_code; // wide BCs are always Java-normal | |
| 0 | 216 _is_wide = true; |
| 217 } | |
| 218 assert(Bytecodes::is_java_code(code), "sanity check"); | |
| 219 } | |
| 1565 | 220 _raw_code = raw_code; |
| 0 | 221 _code = code; |
| 222 return _code; | |
| 223 } | |
| 224 | |
| 225 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } | |
| 1565 | 226 Bytecodes::Code code() const { return _code; } |
| 227 | |
| 228 // Unsigned indices, widening | |
| 2142 | 229 int get_index() const { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); } |
| 1565 | 230 // Get an unsigned 2-byte index, swapping the bytes if necessary. |
| 231 int get_index_u2() const { assert_raw_stream(false); | |
| 2142 | 232 return bytecode().get_index_u2(raw_code(), false); } |
| 1565 | 233 // Get an unsigned 2-byte index in native order. |
| 234 int get_index_u2_cpcache() const { assert_raw_stream(false); | |
| 2142 | 235 return bytecode().get_index_u2_cpcache(raw_code()); } |
| 1565 | 236 int get_index_u4() const { assert_raw_stream(false); |
| 2142 | 237 return bytecode().get_index_u4(raw_code()); } |
| 238 bool has_index_u4() const { return bytecode().has_index_u4(raw_code()); } | |
| 0 | 239 }; |
| 1972 | 240 |
| 241 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP |