Mercurial > hg > truffle
annotate src/share/vm/interpreter/bytecodeStream.hpp @ 2192:b92c45f2bc75
7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart
| author | bobv |
|---|---|
| date | Wed, 02 Feb 2011 11:35:26 -0500 |
| parents | 8012aa3ccede |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2142 | 2 * Copyright (c) 1997, 2011, 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" | |
| 30 #include "oops/methodOop.hpp" | |
| 31 #ifdef TARGET_ARCH_x86 | |
| 32 # include "bytes_x86.hpp" | |
| 33 #endif | |
| 34 #ifdef TARGET_ARCH_sparc | |
| 35 # include "bytes_sparc.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_ARCH_zero | |
| 38 # include "bytes_zero.hpp" | |
| 39 #endif | |
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40 #ifdef TARGET_ARCH_arm |
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41 # include "bytes_arm.hpp" |
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42 #endif |
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43 #ifdef TARGET_ARCH_ppc |
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44 # include "bytes_ppc.hpp" |
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45 #endif |
| 1972 | 46 |
| 0 | 47 // A BytecodeStream is used for fast iteration over the bytecodes |
| 48 // of a methodOop. | |
| 49 // | |
| 50 // Usage: | |
| 51 // | |
| 52 // BytecodeStream s(method); | |
| 53 // Bytecodes::Code c; | |
| 54 // while ((c = s.next()) >= 0) { | |
| 55 // ... | |
| 56 // } | |
| 1565 | 57 |
| 0 | 58 // A RawBytecodeStream is a simple version of BytecodeStream. |
| 59 // It is used ONLY when we know the bytecodes haven't been rewritten | |
| 1565 | 60 // yet, such as in the rewriter or the verifier. |
| 0 | 61 |
| 1565 | 62 // Here is the common base class for both RawBytecodeStream and BytecodeStream: |
| 63 class BaseBytecodeStream: StackObj { | |
| 0 | 64 protected: |
| 65 // stream buffer | |
| 66 methodHandle _method; // read from method directly | |
| 67 | |
| 68 // reading position | |
| 69 int _bci; // bci if current bytecode | |
| 70 int _next_bci; // bci of next bytecode | |
| 71 int _end_bci; // bci after the current iteration interval | |
| 72 | |
| 73 // last bytecode read | |
| 1565 | 74 Bytecodes::Code _raw_code; |
| 0 | 75 bool _is_wide; |
| 1565 | 76 bool _is_raw; // false in 'cooked' BytecodeStream |
| 77 | |
| 78 // Construction | |
| 79 BaseBytecodeStream(methodHandle method) : _method(method) { | |
| 80 set_interval(0, _method->code_size()); | |
| 81 _is_raw = false; | |
| 82 } | |
| 0 | 83 |
| 84 public: | |
| 85 // Iteration control | |
| 86 void set_interval(int beg_bci, int end_bci) { | |
| 87 // iterate over the interval [beg_bci, end_bci) | |
| 88 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci"); | |
| 89 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci"); | |
| 90 // setup of iteration pointers | |
| 91 _bci = beg_bci; | |
| 92 _next_bci = beg_bci; | |
| 93 _end_bci = end_bci; | |
| 94 } | |
| 95 void set_start (int beg_bci) { | |
| 96 set_interval(beg_bci, _method->code_size()); | |
| 97 } | |
| 98 | |
| 1565 | 99 bool is_raw() const { return _is_raw; } |
| 100 | |
| 101 // Stream attributes | |
| 102 methodHandle method() const { return _method; } | |
| 103 | |
| 104 int bci() const { return _bci; } | |
| 105 int next_bci() const { return _next_bci; } | |
| 106 int end_bci() const { return _end_bci; } | |
| 107 | |
| 108 Bytecodes::Code raw_code() const { return _raw_code; } | |
| 109 bool is_wide() const { return _is_wide; } | |
| 110 int instruction_size() const { return (_next_bci - _bci); } | |
| 111 bool is_last_bytecode() const { return _next_bci >= _end_bci; } | |
| 112 | |
| 113 address bcp() const { return method()->code_base() + _bci; } | |
| 2142 | 114 Bytecode bytecode() const { return Bytecode(_method(), bcp()); } |
| 1565 | 115 |
| 116 // State changes | |
| 117 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } | |
| 118 | |
| 119 // Bytecode-specific attributes | |
| 2142 | 120 int dest() const { return bci() + bytecode().get_offset_s2(raw_code()); } |
| 121 int dest_w() const { return bci() + bytecode().get_offset_s4(raw_code()); } | |
| 1565 | 122 |
| 123 // One-byte indices. | |
| 124 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } | |
| 125 | |
| 126 protected: | |
| 127 void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; | |
| 128 void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; | |
| 129 }; | |
| 130 | |
| 131 class RawBytecodeStream: public BaseBytecodeStream { | |
| 132 public: | |
| 133 // Construction | |
| 134 RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) { | |
| 135 _is_raw = true; | |
| 136 } | |
| 137 | |
| 138 public: | |
| 0 | 139 // Iteration |
| 140 // Use raw_next() rather than next() for faster method reference | |
| 141 Bytecodes::Code raw_next() { | |
| 142 Bytecodes::Code code; | |
| 143 // set reading position | |
| 144 _bci = _next_bci; | |
| 145 assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); | |
| 146 | |
| 1565 | 147 address bcp = this->bcp(); |
| 0 | 148 code = Bytecodes::code_or_bp_at(bcp); |
| 149 | |
| 150 // set next bytecode position | |
| 151 int l = Bytecodes::length_for(code); | |
| 152 if (l > 0 && (_bci + l) <= _end_bci) { | |
| 153 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch | |
| 154 && code != Bytecodes::_lookupswitch, "can't be special bytecode"); | |
| 155 _is_wide = false; | |
| 156 _next_bci += l; | |
| 1565 | 157 _raw_code = code; |
| 0 | 158 return code; |
| 159 } else { | |
| 160 return raw_next_special(code); | |
| 161 } | |
| 162 } | |
| 163 Bytecodes::Code raw_next_special(Bytecodes::Code code); | |
| 164 | |
| 1565 | 165 // Unsigned indices, widening, with no swapping of bytes |
| 166 int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); } | |
| 167 // Get an unsigned 2-byte index, with no swapping of bytes. | |
| 168 int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); } | |
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169 |
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170 private: |
| 1565 | 171 int get_index_u2_raw(address p) const { |
| 172 assert_raw_index_size(2); assert_raw_stream(true); | |
| 173 return Bytes::get_Java_u2(p); | |
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174 } |
| 0 | 175 }; |
| 176 | |
| 177 // In BytecodeStream, non-java bytecodes will be translated into the | |
| 178 // corresponding java bytecodes. | |
| 179 | |
| 1565 | 180 class BytecodeStream: public BaseBytecodeStream { |
| 181 Bytecodes::Code _code; | |
| 182 | |
| 0 | 183 public: |
| 184 // Construction | |
| 1565 | 185 BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { } |
| 0 | 186 |
| 187 // Iteration | |
| 188 Bytecodes::Code next() { | |
| 1565 | 189 Bytecodes::Code raw_code, code; |
| 0 | 190 // set reading position |
| 191 _bci = _next_bci; | |
| 192 if (is_last_bytecode()) { | |
| 193 // indicate end of bytecode stream | |
| 1565 | 194 raw_code = code = Bytecodes::_illegal; |
| 0 | 195 } else { |
| 196 // get bytecode | |
| 1565 | 197 address bcp = this->bcp(); |
| 2142 | 198 raw_code = Bytecodes::code_at(_method(), bcp); |
| 1565 | 199 code = Bytecodes::java_code(raw_code); |
| 0 | 200 // set next bytecode position |
| 201 // | |
| 202 // note that we cannot advance before having the | |
| 203 // tty bytecode otherwise the stepping is wrong! | |
| 204 // (carefull: length_for(...) must be used first!) | |
| 205 int l = Bytecodes::length_for(code); | |
| 2142 | 206 if (l == 0) l = Bytecodes::length_at(_method(), bcp); |
| 0 | 207 _next_bci += l; |
| 208 assert(_bci < _next_bci, "length must be > 0"); | |
| 209 // set attributes | |
| 210 _is_wide = false; | |
| 211 // check for special (uncommon) cases | |
| 212 if (code == Bytecodes::_wide) { | |
| 1565 | 213 raw_code = (Bytecodes::Code)bcp[1]; |
| 214 code = raw_code; // wide BCs are always Java-normal | |
| 0 | 215 _is_wide = true; |
| 216 } | |
| 217 assert(Bytecodes::is_java_code(code), "sanity check"); | |
| 218 } | |
| 1565 | 219 _raw_code = raw_code; |
| 0 | 220 _code = code; |
| 221 return _code; | |
| 222 } | |
| 223 | |
| 224 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } | |
| 1565 | 225 Bytecodes::Code code() const { return _code; } |
| 226 | |
| 227 // Unsigned indices, widening | |
| 2142 | 228 int get_index() const { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); } |
| 1565 | 229 // Get an unsigned 2-byte index, swapping the bytes if necessary. |
| 230 int get_index_u2() const { assert_raw_stream(false); | |
| 2142 | 231 return bytecode().get_index_u2(raw_code(), false); } |
| 1565 | 232 // Get an unsigned 2-byte index in native order. |
| 233 int get_index_u2_cpcache() const { assert_raw_stream(false); | |
| 2142 | 234 return bytecode().get_index_u2_cpcache(raw_code()); } |
| 1565 | 235 int get_index_u4() const { assert_raw_stream(false); |
| 2142 | 236 return bytecode().get_index_u4(raw_code()); } |
| 237 bool has_index_u4() const { return bytecode().has_index_u4(raw_code()); } | |
| 0 | 238 }; |
| 1972 | 239 |
| 240 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP |