Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.hpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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_CODE_NMETHOD_HPP |
26 #define SHARE_VM_CODE_NMETHOD_HPP | |
27 | |
28 #include "code/codeBlob.hpp" | |
29 #include "code/pcDesc.hpp" | |
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30 #include "oops/metadata.hpp" |
1972 | 31 |
0 | 32 // This class is used internally by nmethods, to cache |
33 // exception/pc/handler information. | |
34 | |
6197 | 35 class ExceptionCache : public CHeapObj<mtCode> { |
0 | 36 friend class VMStructs; |
37 private: | |
38 enum { cache_size = 16 }; | |
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39 Klass* _exception_type; |
0 | 40 address _pc[cache_size]; |
41 address _handler[cache_size]; | |
42 int _count; | |
43 ExceptionCache* _next; | |
44 | |
45 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; } | |
46 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; } | |
47 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; } | |
48 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; } | |
49 int count() { return _count; } | |
50 void increment_count() { _count++; } | |
51 | |
52 public: | |
53 | |
54 ExceptionCache(Handle exception, address pc, address handler); | |
55 | |
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56 Klass* exception_type() { return _exception_type; } |
0 | 57 ExceptionCache* next() { return _next; } |
58 void set_next(ExceptionCache *ec) { _next = ec; } | |
59 | |
60 address match(Handle exception, address pc); | |
61 bool match_exception_with_space(Handle exception) ; | |
62 address test_address(address addr); | |
63 bool add_address_and_handler(address addr, address handler) ; | |
64 }; | |
65 | |
66 | |
67 // cache pc descs found in earlier inquiries | |
68 class PcDescCache VALUE_OBJ_CLASS_SPEC { | |
69 friend class VMStructs; | |
70 private: | |
71 enum { cache_size = 4 }; | |
72 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found | |
73 public: | |
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74 PcDescCache() { debug_only(_pc_descs[0] = NULL); } |
0 | 75 void reset_to(PcDesc* initial_pc_desc); |
76 PcDesc* find_pc_desc(int pc_offset, bool approximate); | |
77 void add_pc_desc(PcDesc* pc_desc); | |
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78 PcDesc* last_pc_desc() { return _pc_descs[0]; } |
0 | 79 }; |
80 | |
81 | |
82 // nmethods (native methods) are the compiled code versions of Java methods. | |
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83 // |
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84 // An nmethod contains: |
0 | 85 // - header (the nmethod structure) |
86 // [Relocation] | |
87 // - relocation information | |
88 // - constant part (doubles, longs and floats used in nmethod) | |
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89 // - oop table |
0 | 90 // [Code] |
91 // - code body | |
92 // - exception handler | |
93 // - stub code | |
94 // [Debugging information] | |
95 // - oop array | |
96 // - data array | |
97 // - pcs | |
98 // [Exception handler table] | |
99 // - handler entry point array | |
100 // [Implicit Null Pointer exception table] | |
101 // - implicit null table array | |
102 | |
103 class Dependencies; | |
104 class ExceptionHandlerTable; | |
105 class ImplicitExceptionTable; | |
106 class AbstractCompiler; | |
107 class xmlStream; | |
108 | |
109 class nmethod : public CodeBlob { | |
110 friend class VMStructs; | |
111 friend class NMethodSweeper; | |
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112 friend class CodeCache; // scavengable oops |
0 | 113 private: |
114 // Shared fields for all nmethod's | |
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115 Method* _method; |
0 | 116 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method |
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117 jmethodID _jmethod_id; // Cache of method()->jmethod_id() |
0 | 118 |
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119 // To support simple linked-list chaining of nmethods: |
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120 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head |
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121 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods |
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122 |
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123 static nmethod* volatile _oops_do_mark_nmethods; |
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124 nmethod* volatile _oops_do_mark_link; |
0 | 125 |
126 AbstractCompiler* _compiler; // The compiler which compiled this nmethod | |
127 | |
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128 // offsets for entry points |
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129 address _entry_point; // entry point with class check |
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130 address _verified_entry_point; // entry point without class check |
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131 address _osr_entry_point; // entry point for on stack replacement |
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132 |
0 | 133 // Offsets for different nmethod parts |
134 int _exception_offset; | |
1204 | 135 // All deoptee's will resume execution at this location described by |
136 // this offset. | |
0 | 137 int _deoptimize_offset; |
1204 | 138 // All deoptee's at a MethodHandle call site will resume execution |
139 // at this location described by this offset. | |
140 int _deoptimize_mh_offset; | |
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141 // Offset of the unwind handler if it exists |
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142 int _unwind_handler_offset; |
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143 |
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144 #ifdef HAVE_DTRACE_H |
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145 int _trap_offset; |
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146 #endif // def HAVE_DTRACE_H |
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147 int _consts_offset; |
0 | 148 int _stub_offset; |
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149 int _oops_offset; // offset to where embedded oop table begins (inside data) |
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150 int _metadata_offset; // embedded meta data table |
0 | 151 int _scopes_data_offset; |
152 int _scopes_pcs_offset; | |
153 int _dependencies_offset; | |
154 int _handler_table_offset; | |
155 int _nul_chk_table_offset; | |
156 int _nmethod_end_offset; | |
157 | |
158 // location in frame (offset for sp) that deopt can store the original | |
159 // pc during a deopt. | |
160 int _orig_pc_offset; | |
161 | |
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162 int _compile_id; // which compilation made this nmethod |
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163 int _comp_level; // compilation level |
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164 |
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165 // protected by CodeCache_lock |
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166 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) |
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167 |
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168 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) |
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169 bool _marked_for_deoptimization; // Used for stack deoptimization |
0 | 170 |
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171 // used by jvmti to track if an unload event has been posted for this nmethod. |
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172 bool _unload_reported; |
0 | 173 |
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174 // set during construction |
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175 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. |
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176 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? |
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177 unsigned int _lazy_critical_native:1; // Lazy JNI critical native |
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178 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints |
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179 |
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180 // Protected by Patching_lock |
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181 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded} |
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182 |
1726 | 183 #ifdef ASSERT |
184 bool _oops_are_stale; // indicates that it's no longer safe to access oops section | |
185 #endif | |
186 | |
14212 | 187 enum { in_use = 0, // executable nmethod |
188 not_entrant = 1, // marked for deoptimization but activations may still exist, | |
189 // will be transformed to zombie when all activations are gone | |
190 zombie = 2, // no activations exist, nmethod is ready for purge | |
191 unloaded = 3 }; // there should be no activations, should not be called, | |
192 // will be transformed to zombie immediately | |
0 | 193 |
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194 jbyte _scavenge_root_state; |
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195 |
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196 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed |
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197 // and is not made into a zombie. However, once the nmethod is made into |
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198 // a zombie, it will be locked one final time if CompiledMethodUnload |
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199 // event processing needs to be done. |
0 | 200 jint _lock_count; |
201 | |
202 // not_entrant method removal. Each mark_sweep pass will update | |
203 // this mark to current sweep invocation count if it is seen on the | |
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204 // stack. An not_entrant method can be removed when there are no |
0 | 205 // more activations, i.e., when the _stack_traversal_mark is less than |
206 // current sweep traversal index. | |
207 long _stack_traversal_mark; | |
208 | |
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209 // The _hotness_counter indicates the hotness of a method. The higher |
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210 // the value the hotter the method. The hotness counter of a nmethod is |
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211 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method |
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212 // is active while stack scanning (mark_active_nmethods()). The hotness |
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213 // counter is decreased (by 1) while sweeping. |
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214 int _hotness_counter; |
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215 |
0 | 216 ExceptionCache *_exception_cache; |
217 PcDescCache _pc_desc_cache; | |
218 | |
2019 | 219 // These are used for compiled synchronized native methods to |
0 | 220 // locate the owner and stack slot for the BasicLock so that we can |
221 // properly revoke the bias of the owner if necessary. They are | |
222 // needed because there is no debug information for compiled native | |
223 // wrappers and the oop maps are insufficient to allow | |
224 // frame::retrieve_receiver() to work. Currently they are expected | |
225 // to be byte offsets from the Java stack pointer for maximum code | |
226 // sharing between platforms. Note that currently biased locking | |
227 // will never cause Class instances to be biased but this code | |
228 // handles the static synchronized case as well. | |
2019 | 229 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver |
230 // for non-static native wrapper frames. | |
231 ByteSize _native_receiver_sp_offset; | |
232 ByteSize _native_basic_lock_sp_offset; | |
0 | 233 |
234 friend class nmethodLocker; | |
235 | |
236 // For native wrappers | |
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237 nmethod(Method* method, |
0 | 238 int nmethod_size, |
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239 int compile_id, |
0 | 240 CodeOffsets* offsets, |
241 CodeBuffer *code_buffer, | |
242 int frame_size, | |
243 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ | |
244 ByteSize basic_lock_sp_offset, /* synchronized natives only */ | |
245 OopMapSet* oop_maps); | |
246 | |
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247 #ifdef HAVE_DTRACE_H |
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248 // For native wrappers |
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249 nmethod(Method* method, |
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250 int nmethod_size, |
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251 CodeOffsets* offsets, |
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252 CodeBuffer *code_buffer, |
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253 int frame_size); |
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254 #endif // def HAVE_DTRACE_H |
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255 |
0 | 256 // Creation support |
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257 nmethod(Method* method, |
0 | 258 int nmethod_size, |
259 int compile_id, | |
260 int entry_bci, | |
261 CodeOffsets* offsets, | |
262 int orig_pc_offset, | |
263 DebugInformationRecorder *recorder, | |
264 Dependencies* dependencies, | |
265 CodeBuffer *code_buffer, | |
266 int frame_size, | |
267 OopMapSet* oop_maps, | |
268 ExceptionHandlerTable* handler_table, | |
269 ImplicitExceptionTable* nul_chk_table, | |
270 AbstractCompiler* compiler, | |
271 int comp_level); | |
272 | |
273 // helper methods | |
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274 void* operator new(size_t size, int nmethod_size) throw(); |
0 | 275 |
276 const char* reloc_string_for(u_char* begin, u_char* end); | |
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277 // Returns true if this thread changed the state of the nmethod or |
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278 // false if another thread performed the transition. |
1141 | 279 bool make_not_entrant_or_zombie(unsigned int state); |
0 | 280 void inc_decompile_count(); |
281 | |
282 // Used to manipulate the exception cache | |
283 void add_exception_cache_entry(ExceptionCache* new_entry); | |
284 ExceptionCache* exception_cache_entry_for_exception(Handle exception); | |
285 | |
286 // Inform external interfaces that a compiled method has been unloaded | |
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287 void post_compiled_method_unload(); |
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288 |
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289 // Initailize fields to their default values |
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290 void init_defaults(); |
0 | 291 |
292 public: | |
293 // create nmethod with entry_bci | |
294 static nmethod* new_nmethod(methodHandle method, | |
295 int compile_id, | |
296 int entry_bci, | |
297 CodeOffsets* offsets, | |
298 int orig_pc_offset, | |
299 DebugInformationRecorder* recorder, | |
300 Dependencies* dependencies, | |
301 CodeBuffer *code_buffer, | |
302 int frame_size, | |
303 OopMapSet* oop_maps, | |
304 ExceptionHandlerTable* handler_table, | |
305 ImplicitExceptionTable* nul_chk_table, | |
306 AbstractCompiler* compiler, | |
307 int comp_level); | |
308 | |
309 static nmethod* new_native_nmethod(methodHandle method, | |
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310 int compile_id, |
0 | 311 CodeBuffer *code_buffer, |
312 int vep_offset, | |
313 int frame_complete, | |
314 int frame_size, | |
315 ByteSize receiver_sp_offset, | |
316 ByteSize basic_lock_sp_offset, | |
317 OopMapSet* oop_maps); | |
318 | |
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319 #ifdef HAVE_DTRACE_H |
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320 // The method we generate for a dtrace probe has to look |
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321 // like an nmethod as far as the rest of the system is concerned |
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322 // which is somewhat unfortunate. |
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323 static nmethod* new_dtrace_nmethod(methodHandle method, |
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324 CodeBuffer *code_buffer, |
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325 int vep_offset, |
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326 int trap_offset, |
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327 int frame_complete, |
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328 int frame_size); |
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329 |
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330 int trap_offset() const { return _trap_offset; } |
1748 | 331 address trap_address() const { return insts_begin() + _trap_offset; } |
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332 |
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333 #endif // def HAVE_DTRACE_H |
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334 |
0 | 335 // accessors |
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336 Method* method() const { return _method; } |
0 | 337 AbstractCompiler* compiler() const { return _compiler; } |
338 | |
339 // type info | |
340 bool is_nmethod() const { return true; } | |
341 bool is_java_method() const { return !method()->is_native(); } | |
342 bool is_native_method() const { return method()->is_native(); } | |
343 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } | |
344 | |
345 bool is_compiled_by_c1() const; | |
346 bool is_compiled_by_c2() const; | |
1692 | 347 bool is_compiled_by_shark() const; |
0 | 348 |
349 // boundaries for different parts | |
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350 address consts_begin () const { return header_begin() + _consts_offset ; } |
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351 address consts_end () const { return header_begin() + code_offset() ; } |
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352 address insts_begin () const { return header_begin() + code_offset() ; } |
1748 | 353 address insts_end () const { return header_begin() + _stub_offset ; } |
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354 address stub_begin () const { return header_begin() + _stub_offset ; } |
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355 address stub_end () const { return header_begin() + _oops_offset ; } |
1204 | 356 address exception_begin () const { return header_begin() + _exception_offset ; } |
357 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } | |
358 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } | |
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359 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } |
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360 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } |
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361 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } |
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362 |
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363 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } |
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364 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; } |
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365 |
1204 | 366 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } |
367 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } | |
368 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } | |
369 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } | |
370 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } | |
371 address dependencies_end () const { return header_begin() + _handler_table_offset ; } | |
372 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } | |
373 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } | |
374 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } | |
375 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } | |
0 | 376 |
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377 // Sizes |
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378 int consts_size () const { return consts_end () - consts_begin (); } |
1748 | 379 int insts_size () const { return insts_end () - insts_begin (); } |
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380 int stub_size () const { return stub_end () - stub_begin (); } |
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381 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } |
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382 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } |
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383 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } |
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384 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } |
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385 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } |
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386 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } |
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387 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } |
0 | 388 |
389 int total_size () const; | |
390 | |
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391 void dec_hotness_counter() { _hotness_counter--; } |
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392 void set_hotness_counter(int val) { _hotness_counter = val; } |
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393 int hotness_counter() const { return _hotness_counter; } |
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394 |
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395 // Containment |
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396 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } |
1748 | 397 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } |
0 | 398 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } |
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399 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } |
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400 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } |
0 | 401 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } |
402 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } | |
403 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } | |
404 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } | |
405 | |
406 // entry points | |
407 address entry_point() const { return _entry_point; } // normal entry point | |
408 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct | |
409 | |
410 // flag accessing and manipulation | |
14212 | 411 bool is_in_use() const { return _state == in_use; } |
412 bool is_alive() const { return _state == in_use || _state == not_entrant; } | |
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413 bool is_not_entrant() const { return _state == not_entrant; } |
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414 bool is_zombie() const { return _state == zombie; } |
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415 bool is_unloaded() const { return _state == unloaded; } |
0 | 416 |
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417 // Make the nmethod non entrant. The nmethod will continue to be |
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418 // alive. It is used when an uncommon trap happens. Returns true |
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419 // if this thread changed the state of the nmethod or false if |
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420 // another thread performed the transition. |
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421 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } |
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422 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } |
0 | 423 |
424 // used by jvmti to track if the unload event has been reported | |
425 bool unload_reported() { return _unload_reported; } | |
426 void set_unload_reported() { _unload_reported = true; } | |
427 | |
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428 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } |
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429 void mark_for_deoptimization() { _marked_for_deoptimization = true; } |
0 | 430 |
431 void make_unloaded(BoolObjectClosure* is_alive, oop cause); | |
432 | |
433 bool has_dependencies() { return dependencies_size() != 0; } | |
434 void flush_dependencies(BoolObjectClosure* is_alive); | |
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435 bool has_flushed_dependencies() { return _has_flushed_dependencies; } |
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436 void set_has_flushed_dependencies() { |
0 | 437 assert(!has_flushed_dependencies(), "should only happen once"); |
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438 _has_flushed_dependencies = 1; |
0 | 439 } |
440 | |
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441 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } |
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442 void mark_for_reclamation() { _marked_for_reclamation = 1; } |
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443 |
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444 bool has_unsafe_access() const { return _has_unsafe_access; } |
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445 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } |
0 | 446 |
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447 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } |
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448 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } |
0 | 449 |
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450 bool is_lazy_critical_native() const { return _lazy_critical_native; } |
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451 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } |
1202 | 452 |
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453 bool has_wide_vectors() const { return _has_wide_vectors; } |
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454 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; } |
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455 |
0 | 456 int comp_level() const { return _comp_level; } |
457 | |
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458 // Support for oops in scopes and relocs: |
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459 // Note: index 0 is reserved for null. |
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460 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } |
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461 oop* oop_addr_at(int index) const { // for GC |
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462 // relocation indexes are biased by 1 (because 0 is reserved) |
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463 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); |
1726 | 464 assert(!_oops_are_stale, "oops are stale"); |
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465 return &oops_begin()[index - 1]; |
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466 } |
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467 |
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468 // Support for meta data in scopes and relocs: |
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469 // Note: index 0 is reserved for null. |
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470 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } |
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471 Metadata** metadata_addr_at(int index) const { // for GC |
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472 // relocation indexes are biased by 1 (because 0 is reserved) |
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473 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index"); |
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474 return &metadata_begin()[index - 1]; |
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475 } |
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476 |
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477 void copy_values(GrowableArray<jobject>* oops); |
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478 void copy_values(GrowableArray<Metadata*>* metadata); |
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479 |
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480 // Relocation support |
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481 private: |
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482 void fix_oop_relocations(address begin, address end, bool initialize_immediates); |
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483 inline void initialize_immediate_oop(oop* dest, jobject handle); |
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484 |
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485 public: |
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486 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } |
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487 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } |
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488 void verify_oop_relocations(); |
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489 |
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490 bool is_at_poll_return(address pc); |
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491 bool is_at_poll_or_poll_return(address pc); |
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492 |
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493 // Scavengable oop support |
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494 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } |
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495 protected: |
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496 enum { sl_on_list = 0x01, sl_marked = 0x10 }; |
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497 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } |
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498 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } |
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499 // assertion-checking and pruning logic uses the bits of _scavenge_root_state |
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500 #ifndef PRODUCT |
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501 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } |
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502 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } |
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503 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } |
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504 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. |
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505 #endif //PRODUCT |
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506 nmethod* scavenge_root_link() const { return _scavenge_root_link; } |
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507 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } |
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508 |
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509 public: |
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510 |
0 | 511 // Sweeper support |
512 long stack_traversal_mark() { return _stack_traversal_mark; } | |
513 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } | |
514 | |
515 // Exception cache support | |
516 ExceptionCache* exception_cache() const { return _exception_cache; } | |
517 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } | |
518 address handler_for_exception_and_pc(Handle exception, address pc); | |
519 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); | |
520 void remove_from_exception_cache(ExceptionCache* ec); | |
521 | |
522 // implicit exceptions support | |
523 address continuation_for_implicit_exception(address pc); | |
524 | |
525 // On-stack replacement support | |
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526 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } |
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527 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } |
0 | 528 void invalidate_osr_method(); |
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529 nmethod* osr_link() const { return _osr_link; } |
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530 void set_osr_link(nmethod *n) { _osr_link = n; } |
0 | 531 |
532 // tells whether frames described by this nmethod can be deoptimized | |
533 // note: native wrappers cannot be deoptimized. | |
534 bool can_be_deoptimized() const { return is_java_method(); } | |
535 | |
536 // Inline cache support | |
537 void clear_inline_caches(); | |
538 void cleanup_inline_caches(); | |
539 bool inlinecache_check_contains(address addr) const { | |
1748 | 540 return (addr >= code_begin() && addr < verified_entry_point()); |
0 | 541 } |
542 | |
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543 // Check that all metadata is still alive |
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544 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive); |
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545 |
0 | 546 // unlink and deallocate this nmethod |
547 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not | |
548 // expected to use any other private methods/data in this class. | |
549 | |
550 protected: | |
551 void flush(); | |
552 | |
553 public: | |
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554 // When true is returned, it is unsafe to remove this nmethod even if |
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555 // it is a zombie, since the VM or the ServiceThread might still be |
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556 // using it. |
0 | 557 bool is_locked_by_vm() const { return _lock_count >0; } |
558 | |
559 // See comment at definition of _last_seen_on_stack | |
560 void mark_as_seen_on_stack(); | |
561 bool can_not_entrant_be_converted(); | |
562 | |
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563 // Evolution support. We make old (discarded) compiled methods point to new Method*s. |
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564 void set_method(Method* method) { _method = method; } |
0 | 565 |
566 // GC support | |
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567 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); |
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568 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred); |
0 | 569 |
570 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, | |
571 OopClosure* f); | |
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572 void oops_do(OopClosure* f) { oops_do(f, false); } |
12080 | 573 void oops_do(OopClosure* f, bool allow_zombie); |
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574 bool detect_scavenge_root_oops(); |
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575 void verify_scavenge_root_oops() PRODUCT_RETURN; |
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576 |
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577 bool test_set_oops_do_mark(); |
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578 static void oops_do_marking_prologue(); |
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579 static void oops_do_marking_epilogue(); |
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580 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } |
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581 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } |
0 | 582 |
583 // ScopeDesc for an instruction | |
584 ScopeDesc* scope_desc_at(address pc); | |
585 | |
586 private: | |
587 ScopeDesc* scope_desc_in(address begin, address end); | |
588 | |
1204 | 589 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } |
0 | 590 |
591 PcDesc* find_pc_desc_internal(address pc, bool approximate); | |
592 | |
593 PcDesc* find_pc_desc(address pc, bool approximate) { | |
594 PcDesc* desc = _pc_desc_cache.last_pc_desc(); | |
1748 | 595 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { |
0 | 596 return desc; |
597 } | |
598 return find_pc_desc_internal(pc, approximate); | |
599 } | |
600 | |
601 public: | |
602 // ScopeDesc retrieval operation | |
603 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } | |
604 // pc_desc_near returns the first PcDesc at or after the givne pc. | |
605 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } | |
606 | |
607 public: | |
608 // copying of debugging information | |
609 void copy_scopes_pcs(PcDesc* pcs, int count); | |
610 void copy_scopes_data(address buffer, int size); | |
611 | |
1204 | 612 // Deopt |
613 // Return true is the PC is one would expect if the frame is being deopted. | |
614 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } | |
615 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } | |
616 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } | |
0 | 617 // Accessor/mutator for the original pc of a frame before a frame was deopted. |
618 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } | |
619 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } | |
620 | |
1204 | 621 static address get_deopt_original_pc(const frame* fr); |
622 | |
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623 // MethodHandle |
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624 bool is_method_handle_return(address return_pc); |
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625 |
0 | 626 // jvmti support: |
627 void post_compiled_method_load_event(); | |
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628 jmethodID get_and_cache_jmethod_id(); |
0 | 629 |
630 // verify operations | |
631 void verify(); | |
632 void verify_scopes(); | |
633 void verify_interrupt_point(address interrupt_point); | |
634 | |
635 // printing support | |
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636 void print() const; |
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637 void print_code(); |
0 | 638 void print_relocations() PRODUCT_RETURN; |
639 void print_pcs() PRODUCT_RETURN; | |
640 void print_scopes() PRODUCT_RETURN; | |
641 void print_dependencies() PRODUCT_RETURN; | |
642 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
643 void print_calls(outputStream* st) PRODUCT_RETURN; | |
644 void print_handler_table() PRODUCT_RETURN; | |
645 void print_nul_chk_table() PRODUCT_RETURN; | |
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646 void print_nmethod(bool print_code); |
0 | 647 |
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648 // need to re-define this from CodeBlob else the overload hides it |
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649 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } |
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650 void print_on(outputStream* st, const char* msg) const; |
0 | 651 |
652 // Logging | |
653 void log_identity(xmlStream* log) const; | |
654 void log_new_nmethod() const; | |
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655 void log_state_change() const; |
0 | 656 |
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657 // Prints block-level comments, including nmethod specific block labels: |
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658 virtual void print_block_comment(outputStream* stream, address block_begin) const { |
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659 print_nmethod_labels(stream, block_begin); |
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660 CodeBlob::print_block_comment(stream, block_begin); |
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661 } |
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662 void print_nmethod_labels(outputStream* stream, address block_begin) const; |
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663 |
0 | 664 // Prints a comment for one native instruction (reloc info, pc desc) |
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665 void print_code_comment_on(outputStream* st, int column, address begin, address end); |
0 | 666 static void print_statistics() PRODUCT_RETURN; |
667 | |
668 // Compiler task identification. Note that all OSR methods | |
669 // are numbered in an independent sequence if CICountOSR is true, | |
670 // and native method wrappers are also numbered independently if | |
671 // CICountNative is true. | |
672 int compile_id() const { return _compile_id; } | |
673 const char* compile_kind() const; | |
674 | |
675 // For debugging | |
676 // CompiledIC* IC_at(char* p) const; | |
677 // PrimitiveIC* primitiveIC_at(char* p) const; | |
678 oop embeddedOop_at(address p); | |
679 | |
680 // tells if any of this method's dependencies have been invalidated | |
681 // (this is expensive!) | |
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682 static void check_all_dependencies(DepChange& changes); |
0 | 683 |
684 // tells if this compiled method is dependent on the given changes, | |
685 // and the changes have invalidated it | |
686 bool check_dependency_on(DepChange& changes); | |
687 | |
688 // Evolution support. Tells if this compiled method is dependent on any of | |
689 // methods m() of class dependee, such that if m() in dependee is replaced, | |
690 // this compiled method will have to be deoptimized. | |
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691 bool is_evol_dependent_on(Klass* dependee); |
0 | 692 |
693 // Fast breakpoint support. Tells if this compiled method is | |
694 // dependent on the given method. Returns true if this nmethod | |
695 // corresponds to the given method as well. | |
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696 bool is_dependent_on_method(Method* dependee); |
0 | 697 |
698 // is it ok to patch at address? | |
699 bool is_patchable_at(address instr_address); | |
700 | |
701 // UseBiasedLocking support | |
2019 | 702 ByteSize native_receiver_sp_offset() { |
703 return _native_receiver_sp_offset; | |
0 | 704 } |
2019 | 705 ByteSize native_basic_lock_sp_offset() { |
706 return _native_basic_lock_sp_offset; | |
0 | 707 } |
708 | |
709 // support for code generation | |
710 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } | |
711 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } | |
712 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } | |
713 | |
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714 // RedefineClasses support. Mark metadata in nmethods as on_stack so that |
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715 // redefine classes doesn't purge it. |
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716 static void mark_on_stack(nmethod* nm) { |
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717 nm->metadata_do(Metadata::mark_on_stack); |
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718 } |
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719 void metadata_do(void f(Metadata*)); |
0 | 720 }; |
721 | |
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722 // Locks an nmethod so its code will not get removed and it will not |
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723 // be made into a zombie, even if it is a not_entrant method. After the |
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724 // nmethod becomes a zombie, if CompiledMethodUnload event processing |
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725 // needs to be done, then lock_nmethod() is used directly to keep the |
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726 // generated code from being reused too early. |
0 | 727 class nmethodLocker : public StackObj { |
728 nmethod* _nm; | |
729 | |
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730 public: |
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731 |
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732 // note: nm can be NULL |
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733 // Only JvmtiDeferredEvent::compiled_method_unload_event() |
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734 // should pass zombie_ok == true. |
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735 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); |
0 | 736 static void unlock_nmethod(nmethod* nm); // (ditto) |
737 | |
738 nmethodLocker(address pc); // derive nm from pc | |
739 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } | |
740 nmethodLocker() { _nm = NULL; } | |
741 ~nmethodLocker() { unlock_nmethod(_nm); } | |
742 | |
743 nmethod* code() { return _nm; } | |
744 void set_code(nmethod* new_nm) { | |
745 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. | |
746 _nm = new_nm; | |
747 lock_nmethod(_nm); | |
748 } | |
749 }; | |
1972 | 750 |
751 #endif // SHARE_VM_CODE_NMETHOD_HPP |