Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.hpp @ 20432:aff6ccb506cb
8056154: JVM crash with EXCEPTION_ACCESS_VIOLATION when there are many threads running
Summary: Don't make compiled MH intrinsics not entrant when redefining classes
Reviewed-by: kvn, vlivanov
| author | iveresov |
|---|---|
| date | Fri, 05 Sep 2014 14:39:45 -0700 |
| parents | 2c6ef90f030a |
| children | b12a2a9b05ca |
| rev | line source |
|---|---|
| 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 }; | |
| 20227 | 72 // The array elements MUST be volatile! Several threads may modify |
| 73 // and read from the cache concurrently. find_pc_desc_internal has | |
| 74 // returned wrong results. C++ compiler (namely xlC12) may duplicate | |
| 75 // C++ field accesses if the elements are not volatile. | |
| 76 typedef PcDesc* PcDescPtr; | |
| 77 volatile PcDescPtr _pc_descs[cache_size]; // last cache_size pc_descs found | |
| 0 | 78 public: |
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79 PcDescCache() { debug_only(_pc_descs[0] = NULL); } |
| 0 | 80 void reset_to(PcDesc* initial_pc_desc); |
| 81 PcDesc* find_pc_desc(int pc_offset, bool approximate); | |
| 82 void add_pc_desc(PcDesc* pc_desc); | |
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83 PcDesc* last_pc_desc() { return _pc_descs[0]; } |
| 0 | 84 }; |
| 85 | |
| 86 | |
| 87 // nmethods (native methods) are the compiled code versions of Java methods. | |
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88 // |
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89 // An nmethod contains: |
| 0 | 90 // - header (the nmethod structure) |
| 91 // [Relocation] | |
| 92 // - relocation information | |
| 93 // - constant part (doubles, longs and floats used in nmethod) | |
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94 // - oop table |
| 0 | 95 // [Code] |
| 96 // - code body | |
| 97 // - exception handler | |
| 98 // - stub code | |
| 99 // [Debugging information] | |
| 100 // - oop array | |
| 101 // - data array | |
| 102 // - pcs | |
| 103 // [Exception handler table] | |
| 104 // - handler entry point array | |
| 105 // [Implicit Null Pointer exception table] | |
| 106 // - implicit null table array | |
| 107 | |
| 108 class Dependencies; | |
| 109 class ExceptionHandlerTable; | |
| 110 class ImplicitExceptionTable; | |
| 111 class AbstractCompiler; | |
| 112 class xmlStream; | |
| 113 | |
| 114 class nmethod : public CodeBlob { | |
| 115 friend class VMStructs; | |
| 116 friend class NMethodSweeper; | |
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117 friend class CodeCache; // scavengable oops |
| 0 | 118 private: |
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119 |
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120 // GC support to help figure out if an nmethod has been |
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121 // cleaned/unloaded by the current GC. |
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122 static unsigned char _global_unloading_clock; |
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123 |
| 0 | 124 // Shared fields for all nmethod's |
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125 Method* _method; |
| 0 | 126 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method |
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127 jmethodID _jmethod_id; // Cache of method()->jmethod_id() |
| 0 | 128 |
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129 // To support simple linked-list chaining of nmethods: |
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130 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head |
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131 |
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132 union { |
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133 // Used by G1 to chain nmethods. |
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134 nmethod* _unloading_next; |
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135 // Used by non-G1 GCs to chain nmethods. |
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136 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods |
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137 }; |
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138 |
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139 static nmethod* volatile _oops_do_mark_nmethods; |
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140 nmethod* volatile _oops_do_mark_link; |
| 0 | 141 |
| 142 AbstractCompiler* _compiler; // The compiler which compiled this nmethod | |
| 143 | |
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144 // offsets for entry points |
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145 address _entry_point; // entry point with class check |
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146 address _verified_entry_point; // entry point without class check |
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147 address _osr_entry_point; // entry point for on stack replacement |
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148 |
| 0 | 149 // Offsets for different nmethod parts |
| 150 int _exception_offset; | |
| 1204 | 151 // All deoptee's will resume execution at this location described by |
| 152 // this offset. | |
| 0 | 153 int _deoptimize_offset; |
| 1204 | 154 // All deoptee's at a MethodHandle call site will resume execution |
| 155 // at this location described by this offset. | |
| 156 int _deoptimize_mh_offset; | |
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157 // Offset of the unwind handler if it exists |
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158 int _unwind_handler_offset; |
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159 |
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160 #ifdef HAVE_DTRACE_H |
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161 int _trap_offset; |
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162 #endif // def HAVE_DTRACE_H |
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163 int _consts_offset; |
| 0 | 164 int _stub_offset; |
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165 int _oops_offset; // offset to where embedded oop table begins (inside data) |
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166 int _metadata_offset; // embedded meta data table |
| 0 | 167 int _scopes_data_offset; |
| 168 int _scopes_pcs_offset; | |
| 169 int _dependencies_offset; | |
| 170 int _handler_table_offset; | |
| 171 int _nul_chk_table_offset; | |
| 172 int _nmethod_end_offset; | |
| 173 | |
| 174 // location in frame (offset for sp) that deopt can store the original | |
| 175 // pc during a deopt. | |
| 176 int _orig_pc_offset; | |
| 177 | |
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178 int _compile_id; // which compilation made this nmethod |
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179 int _comp_level; // compilation level |
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180 |
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181 // protected by CodeCache_lock |
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182 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) |
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183 |
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184 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) |
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185 bool _marked_for_deoptimization; // Used for stack deoptimization |
| 0 | 186 |
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187 // used by jvmti to track if an unload event has been posted for this nmethod. |
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188 bool _unload_reported; |
| 0 | 189 |
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190 // set during construction |
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191 unsigned int _has_unsafe_access:1; // May fault due to unsafe access. |
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192 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? |
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193 unsigned int _lazy_critical_native:1; // Lazy JNI critical native |
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194 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints |
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195 |
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196 // Protected by Patching_lock |
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197 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded} |
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198 |
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199 volatile unsigned char _unloading_clock; // Incremented after GC unloaded/cleaned the nmethod |
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200 |
| 1726 | 201 #ifdef ASSERT |
| 202 bool _oops_are_stale; // indicates that it's no longer safe to access oops section | |
| 203 #endif | |
| 204 | |
| 13441 | 205 enum { in_use = 0, // executable nmethod |
| 206 not_entrant = 1, // marked for deoptimization but activations may still exist, | |
| 207 // will be transformed to zombie when all activations are gone | |
| 208 zombie = 2, // no activations exist, nmethod is ready for purge | |
| 209 unloaded = 3 }; // there should be no activations, should not be called, | |
| 210 // will be transformed to zombie immediately | |
| 0 | 211 |
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212 jbyte _scavenge_root_state; |
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213 |
| 17780 | 214 #if INCLUDE_RTM_OPT |
| 215 // RTM state at compile time. Used during deoptimization to decide | |
| 216 // whether to restart collecting RTM locking abort statistic again. | |
| 217 RTMState _rtm_state; | |
| 218 #endif | |
| 219 | |
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220 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed |
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221 // and is not made into a zombie. However, once the nmethod is made into |
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222 // a zombie, it will be locked one final time if CompiledMethodUnload |
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223 // event processing needs to be done. |
| 0 | 224 jint _lock_count; |
| 225 | |
| 226 // not_entrant method removal. Each mark_sweep pass will update | |
| 227 // this mark to current sweep invocation count if it is seen on the | |
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228 // stack. An not_entrant method can be removed when there are no |
| 0 | 229 // more activations, i.e., when the _stack_traversal_mark is less than |
| 230 // current sweep traversal index. | |
| 231 long _stack_traversal_mark; | |
| 232 | |
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233 // The _hotness_counter indicates the hotness of a method. The higher |
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234 // the value the hotter the method. The hotness counter of a nmethod is |
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235 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method |
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236 // is active while stack scanning (mark_active_nmethods()). The hotness |
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237 // counter is decreased (by 1) while sweeping. |
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238 int _hotness_counter; |
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239 |
| 0 | 240 ExceptionCache *_exception_cache; |
| 241 PcDescCache _pc_desc_cache; | |
| 242 | |
| 2019 | 243 // These are used for compiled synchronized native methods to |
| 0 | 244 // locate the owner and stack slot for the BasicLock so that we can |
| 245 // properly revoke the bias of the owner if necessary. They are | |
| 246 // needed because there is no debug information for compiled native | |
| 247 // wrappers and the oop maps are insufficient to allow | |
| 248 // frame::retrieve_receiver() to work. Currently they are expected | |
| 249 // to be byte offsets from the Java stack pointer for maximum code | |
| 250 // sharing between platforms. Note that currently biased locking | |
| 251 // will never cause Class instances to be biased but this code | |
| 252 // handles the static synchronized case as well. | |
| 2019 | 253 // JVMTI's GetLocalInstance() also uses these offsets to find the receiver |
| 254 // for non-static native wrapper frames. | |
| 255 ByteSize _native_receiver_sp_offset; | |
| 256 ByteSize _native_basic_lock_sp_offset; | |
| 0 | 257 |
| 258 friend class nmethodLocker; | |
| 259 | |
| 260 // For native wrappers | |
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261 nmethod(Method* method, |
| 0 | 262 int nmethod_size, |
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263 int compile_id, |
| 0 | 264 CodeOffsets* offsets, |
| 265 CodeBuffer *code_buffer, | |
| 266 int frame_size, | |
| 267 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ | |
| 268 ByteSize basic_lock_sp_offset, /* synchronized natives only */ | |
| 269 OopMapSet* oop_maps); | |
| 270 | |
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271 #ifdef HAVE_DTRACE_H |
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272 // For native wrappers |
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273 nmethod(Method* method, |
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274 int nmethod_size, |
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275 CodeOffsets* offsets, |
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276 CodeBuffer *code_buffer, |
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277 int frame_size); |
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278 #endif // def HAVE_DTRACE_H |
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279 |
| 0 | 280 // Creation support |
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281 nmethod(Method* method, |
| 0 | 282 int nmethod_size, |
| 283 int compile_id, | |
| 284 int entry_bci, | |
| 285 CodeOffsets* offsets, | |
| 286 int orig_pc_offset, | |
| 287 DebugInformationRecorder *recorder, | |
| 288 Dependencies* dependencies, | |
| 289 CodeBuffer *code_buffer, | |
| 290 int frame_size, | |
| 291 OopMapSet* oop_maps, | |
| 292 ExceptionHandlerTable* handler_table, | |
| 293 ImplicitExceptionTable* nul_chk_table, | |
| 294 AbstractCompiler* compiler, | |
| 295 int comp_level); | |
| 296 | |
| 297 // helper methods | |
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298 void* operator new(size_t size, int nmethod_size) throw(); |
| 0 | 299 |
| 300 const char* reloc_string_for(u_char* begin, u_char* end); | |
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301 // Returns true if this thread changed the state of the nmethod or |
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302 // false if another thread performed the transition. |
| 1141 | 303 bool make_not_entrant_or_zombie(unsigned int state); |
| 0 | 304 void inc_decompile_count(); |
| 305 | |
| 306 // Used to manipulate the exception cache | |
| 307 void add_exception_cache_entry(ExceptionCache* new_entry); | |
| 308 ExceptionCache* exception_cache_entry_for_exception(Handle exception); | |
| 309 | |
| 310 // Inform external interfaces that a compiled method has been unloaded | |
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311 void post_compiled_method_unload(); |
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312 |
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313 // Initailize fields to their default values |
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314 void init_defaults(); |
| 0 | 315 |
| 316 public: | |
| 317 // create nmethod with entry_bci | |
| 318 static nmethod* new_nmethod(methodHandle method, | |
| 319 int compile_id, | |
| 320 int entry_bci, | |
| 321 CodeOffsets* offsets, | |
| 322 int orig_pc_offset, | |
| 323 DebugInformationRecorder* recorder, | |
| 324 Dependencies* dependencies, | |
| 325 CodeBuffer *code_buffer, | |
| 326 int frame_size, | |
| 327 OopMapSet* oop_maps, | |
| 328 ExceptionHandlerTable* handler_table, | |
| 329 ImplicitExceptionTable* nul_chk_table, | |
| 330 AbstractCompiler* compiler, | |
| 331 int comp_level); | |
| 332 | |
| 333 static nmethod* new_native_nmethod(methodHandle method, | |
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334 int compile_id, |
| 0 | 335 CodeBuffer *code_buffer, |
| 336 int vep_offset, | |
| 337 int frame_complete, | |
| 338 int frame_size, | |
| 339 ByteSize receiver_sp_offset, | |
| 340 ByteSize basic_lock_sp_offset, | |
| 341 OopMapSet* oop_maps); | |
| 342 | |
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343 #ifdef HAVE_DTRACE_H |
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344 // The method we generate for a dtrace probe has to look |
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345 // like an nmethod as far as the rest of the system is concerned |
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346 // which is somewhat unfortunate. |
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347 static nmethod* new_dtrace_nmethod(methodHandle method, |
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348 CodeBuffer *code_buffer, |
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349 int vep_offset, |
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350 int trap_offset, |
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351 int frame_complete, |
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352 int frame_size); |
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353 |
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354 int trap_offset() const { return _trap_offset; } |
| 1748 | 355 address trap_address() const { return insts_begin() + _trap_offset; } |
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356 |
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357 #endif // def HAVE_DTRACE_H |
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358 |
| 0 | 359 // accessors |
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360 Method* method() const { return _method; } |
| 0 | 361 AbstractCompiler* compiler() const { return _compiler; } |
| 362 | |
| 363 // type info | |
| 364 bool is_nmethod() const { return true; } | |
| 365 bool is_java_method() const { return !method()->is_native(); } | |
| 366 bool is_native_method() const { return method()->is_native(); } | |
| 367 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } | |
| 368 | |
| 369 bool is_compiled_by_c1() const; | |
| 370 bool is_compiled_by_c2() const; | |
| 1692 | 371 bool is_compiled_by_shark() const; |
| 0 | 372 |
| 373 // boundaries for different parts | |
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374 address consts_begin () const { return header_begin() + _consts_offset ; } |
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375 address consts_end () const { return header_begin() + code_offset() ; } |
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376 address insts_begin () const { return header_begin() + code_offset() ; } |
| 1748 | 377 address insts_end () const { return header_begin() + _stub_offset ; } |
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378 address stub_begin () const { return header_begin() + _stub_offset ; } |
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379 address stub_end () const { return header_begin() + _oops_offset ; } |
| 1204 | 380 address exception_begin () const { return header_begin() + _exception_offset ; } |
| 381 address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; } | |
| 382 address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; } | |
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383 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; } |
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384 oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; } |
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385 oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; } |
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386 |
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387 Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; } |
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388 Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; } |
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389 |
| 1204 | 390 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } |
| 391 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } | |
| 392 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } | |
| 393 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; } | |
| 394 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } | |
| 395 address dependencies_end () const { return header_begin() + _handler_table_offset ; } | |
| 396 address handler_table_begin () const { return header_begin() + _handler_table_offset ; } | |
| 397 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } | |
| 398 address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; } | |
| 399 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } | |
| 0 | 400 |
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401 // Sizes |
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402 int consts_size () const { return consts_end () - consts_begin (); } |
| 1748 | 403 int insts_size () const { return insts_end () - insts_begin (); } |
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404 int stub_size () const { return stub_end () - stub_begin (); } |
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405 int oops_size () const { return (address) oops_end () - (address) oops_begin (); } |
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406 int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); } |
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407 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } |
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408 int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); } |
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409 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } |
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410 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } |
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411 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } |
| 0 | 412 |
| 413 int total_size () const; | |
| 414 | |
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415 void dec_hotness_counter() { _hotness_counter--; } |
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416 void set_hotness_counter(int val) { _hotness_counter = val; } |
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417 int hotness_counter() const { return _hotness_counter; } |
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418 |
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419 // Containment |
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420 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } |
| 1748 | 421 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } |
| 0 | 422 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } |
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423 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } |
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424 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); } |
| 0 | 425 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } |
| 426 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } | |
| 427 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } | |
| 428 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } | |
| 429 | |
| 430 // entry points | |
| 431 address entry_point() const { return _entry_point; } // normal entry point | |
| 432 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct | |
| 433 | |
| 434 // flag accessing and manipulation | |
| 13441 | 435 bool is_in_use() const { return _state == in_use; } |
| 436 bool is_alive() const { return _state == in_use || _state == not_entrant; } | |
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437 bool is_not_entrant() const { return _state == not_entrant; } |
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438 bool is_zombie() const { return _state == zombie; } |
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439 bool is_unloaded() const { return _state == unloaded; } |
| 0 | 440 |
| 17780 | 441 #if INCLUDE_RTM_OPT |
| 442 // rtm state accessing and manipulating | |
| 443 RTMState rtm_state() const { return _rtm_state; } | |
| 444 void set_rtm_state(RTMState state) { _rtm_state = state; } | |
| 445 #endif | |
| 446 | |
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447 // Make the nmethod non entrant. The nmethod will continue to be |
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448 // alive. It is used when an uncommon trap happens. Returns true |
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449 // if this thread changed the state of the nmethod or false if |
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450 // another thread performed the transition. |
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451 bool make_not_entrant() { |
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452 assert(!method()->is_method_handle_intrinsic(), "Cannot make MH intrinsic not entrant"); |
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453 return make_not_entrant_or_zombie(not_entrant); |
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454 } |
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455 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } |
| 0 | 456 |
| 457 // used by jvmti to track if the unload event has been reported | |
| 458 bool unload_reported() { return _unload_reported; } | |
| 459 void set_unload_reported() { _unload_reported = true; } | |
| 460 | |
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461 void set_unloading_next(nmethod* next) { _unloading_next = next; } |
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462 nmethod* unloading_next() { return _unloading_next; } |
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463 |
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464 static unsigned char global_unloading_clock() { return _global_unloading_clock; } |
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465 static void increase_unloading_clock(); |
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466 |
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467 void set_unloading_clock(unsigned char unloading_clock); |
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468 unsigned char unloading_clock(); |
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469 |
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470 bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; } |
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471 void mark_for_deoptimization() { _marked_for_deoptimization = true; } |
| 0 | 472 |
| 473 void make_unloaded(BoolObjectClosure* is_alive, oop cause); | |
| 474 | |
| 475 bool has_dependencies() { return dependencies_size() != 0; } | |
| 476 void flush_dependencies(BoolObjectClosure* is_alive); | |
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477 bool has_flushed_dependencies() { return _has_flushed_dependencies; } |
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478 void set_has_flushed_dependencies() { |
| 0 | 479 assert(!has_flushed_dependencies(), "should only happen once"); |
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480 _has_flushed_dependencies = 1; |
| 0 | 481 } |
| 482 | |
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483 bool is_marked_for_reclamation() const { return _marked_for_reclamation; } |
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484 void mark_for_reclamation() { _marked_for_reclamation = 1; } |
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485 |
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486 bool has_unsafe_access() const { return _has_unsafe_access; } |
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487 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } |
| 0 | 488 |
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489 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } |
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490 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } |
| 0 | 491 |
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492 bool is_lazy_critical_native() const { return _lazy_critical_native; } |
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493 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } |
| 1202 | 494 |
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495 bool has_wide_vectors() const { return _has_wide_vectors; } |
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496 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; } |
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497 |
| 0 | 498 int comp_level() const { return _comp_level; } |
| 499 | |
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500 // Support for oops in scopes and relocs: |
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501 // Note: index 0 is reserved for null. |
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502 oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); } |
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503 oop* oop_addr_at(int index) const { // for GC |
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504 // relocation indexes are biased by 1 (because 0 is reserved) |
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505 assert(index > 0 && index <= oops_size(), "must be a valid non-zero index"); |
| 1726 | 506 assert(!_oops_are_stale, "oops are stale"); |
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507 return &oops_begin()[index - 1]; |
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508 } |
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509 |
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510 // Support for meta data in scopes and relocs: |
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511 // Note: index 0 is reserved for null. |
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512 Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); } |
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513 Metadata** metadata_addr_at(int index) const { // for GC |
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514 // relocation indexes are biased by 1 (because 0 is reserved) |
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515 assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index"); |
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516 return &metadata_begin()[index - 1]; |
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517 } |
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518 |
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519 void copy_values(GrowableArray<jobject>* oops); |
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520 void copy_values(GrowableArray<Metadata*>* metadata); |
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521 |
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522 // Relocation support |
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523 private: |
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524 void fix_oop_relocations(address begin, address end, bool initialize_immediates); |
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525 inline void initialize_immediate_oop(oop* dest, jobject handle); |
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526 |
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527 public: |
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528 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } |
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529 void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } |
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530 void verify_oop_relocations(); |
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531 |
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532 bool is_at_poll_return(address pc); |
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533 bool is_at_poll_or_poll_return(address pc); |
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534 |
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535 // Scavengable oop support |
|
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536 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } |
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537 protected: |
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538 enum { sl_on_list = 0x01, sl_marked = 0x10 }; |
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539 void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; } |
|
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540 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } |
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541 // assertion-checking and pruning logic uses the bits of _scavenge_root_state |
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542 #ifndef PRODUCT |
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543 void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; } |
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544 void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; } |
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545 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; } |
|
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546 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. |
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547 #endif //PRODUCT |
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548 nmethod* scavenge_root_link() const { return _scavenge_root_link; } |
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549 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } |
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550 |
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551 public: |
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552 |
| 0 | 553 // Sweeper support |
| 554 long stack_traversal_mark() { return _stack_traversal_mark; } | |
| 555 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } | |
| 556 | |
| 557 // Exception cache support | |
| 558 ExceptionCache* exception_cache() const { return _exception_cache; } | |
| 559 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } | |
| 560 address handler_for_exception_and_pc(Handle exception, address pc); | |
| 561 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); | |
| 20269 | 562 void clean_exception_cache(BoolObjectClosure* is_alive); |
| 0 | 563 |
| 564 // implicit exceptions support | |
| 565 address continuation_for_implicit_exception(address pc); | |
| 566 | |
| 567 // On-stack replacement support | |
|
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568 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; } |
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569 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; } |
| 0 | 570 void invalidate_osr_method(); |
|
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571 nmethod* osr_link() const { return _osr_link; } |
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572 void set_osr_link(nmethod *n) { _osr_link = n; } |
| 0 | 573 |
| 574 // tells whether frames described by this nmethod can be deoptimized | |
| 575 // note: native wrappers cannot be deoptimized. | |
| 576 bool can_be_deoptimized() const { return is_java_method(); } | |
| 577 | |
| 578 // Inline cache support | |
| 579 void clear_inline_caches(); | |
| 580 void cleanup_inline_caches(); | |
| 581 bool inlinecache_check_contains(address addr) const { | |
| 1748 | 582 return (addr >= code_begin() && addr < verified_entry_point()); |
| 0 | 583 } |
| 584 | |
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585 // Verify calls to dead methods have been cleaned. |
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586 void verify_clean_inline_caches(); |
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587 // Verify and count cached icholder relocations. |
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588 int verify_icholder_relocations(); |
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589 // Check that all metadata is still alive |
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590 void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive); |
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591 |
| 0 | 592 // unlink and deallocate this nmethod |
| 593 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not | |
| 594 // expected to use any other private methods/data in this class. | |
| 595 | |
| 596 protected: | |
| 597 void flush(); | |
| 598 | |
| 599 public: | |
|
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600 // When true is returned, it is unsafe to remove this nmethod even if |
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601 // it is a zombie, since the VM or the ServiceThread might still be |
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602 // using it. |
| 0 | 603 bool is_locked_by_vm() const { return _lock_count >0; } |
| 604 | |
| 605 // See comment at definition of _last_seen_on_stack | |
| 606 void mark_as_seen_on_stack(); | |
| 607 bool can_not_entrant_be_converted(); | |
| 608 | |
|
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609 // Evolution support. We make old (discarded) compiled methods point to new Method*s. |
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610 void set_method(Method* method) { _method = method; } |
| 0 | 611 |
| 612 // GC support | |
|
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613 void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); |
|
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614 // The parallel versions are used by G1. |
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615 bool do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred); |
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616 void do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred); |
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617 // Unload a nmethod if the *root object is dead. |
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618 bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred); |
| 0 | 619 |
| 620 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, | |
| 621 OopClosure* f); | |
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622 void oops_do(OopClosure* f) { oops_do(f, false); } |
| 12080 | 623 void oops_do(OopClosure* f, bool allow_zombie); |
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624 bool detect_scavenge_root_oops(); |
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625 void verify_scavenge_root_oops() PRODUCT_RETURN; |
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626 |
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627 bool test_set_oops_do_mark(); |
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628 static void oops_do_marking_prologue(); |
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629 static void oops_do_marking_epilogue(); |
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630 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } |
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631 bool test_oops_do_mark() { return _oops_do_mark_link != NULL; } |
| 0 | 632 |
| 633 // ScopeDesc for an instruction | |
| 634 ScopeDesc* scope_desc_at(address pc); | |
| 635 | |
| 636 private: | |
| 637 ScopeDesc* scope_desc_in(address begin, address end); | |
| 638 | |
| 1204 | 639 address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } |
| 0 | 640 |
| 641 PcDesc* find_pc_desc_internal(address pc, bool approximate); | |
| 642 | |
| 643 PcDesc* find_pc_desc(address pc, bool approximate) { | |
| 644 PcDesc* desc = _pc_desc_cache.last_pc_desc(); | |
| 1748 | 645 if (desc != NULL && desc->pc_offset() == pc - code_begin()) { |
| 0 | 646 return desc; |
| 647 } | |
| 648 return find_pc_desc_internal(pc, approximate); | |
| 649 } | |
| 650 | |
| 651 public: | |
| 652 // ScopeDesc retrieval operation | |
| 653 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } | |
| 654 // pc_desc_near returns the first PcDesc at or after the givne pc. | |
| 655 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } | |
| 656 | |
| 657 public: | |
| 658 // copying of debugging information | |
| 659 void copy_scopes_pcs(PcDesc* pcs, int count); | |
| 660 void copy_scopes_data(address buffer, int size); | |
| 661 | |
| 1204 | 662 // Deopt |
| 663 // Return true is the PC is one would expect if the frame is being deopted. | |
| 664 bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); } | |
| 665 bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); } | |
| 666 bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); } | |
| 0 | 667 // Accessor/mutator for the original pc of a frame before a frame was deopted. |
| 668 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } | |
| 669 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } | |
| 670 | |
| 1204 | 671 static address get_deopt_original_pc(const frame* fr); |
| 672 | |
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673 // MethodHandle |
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674 bool is_method_handle_return(address return_pc); |
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675 |
| 0 | 676 // jvmti support: |
| 677 void post_compiled_method_load_event(); | |
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678 jmethodID get_and_cache_jmethod_id(); |
| 0 | 679 |
| 680 // verify operations | |
| 681 void verify(); | |
| 682 void verify_scopes(); | |
| 683 void verify_interrupt_point(address interrupt_point); | |
| 684 | |
| 685 // printing support | |
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686 void print() const; |
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687 void print_code(); |
| 0 | 688 void print_relocations() PRODUCT_RETURN; |
| 689 void print_pcs() PRODUCT_RETURN; | |
| 690 void print_scopes() PRODUCT_RETURN; | |
| 691 void print_dependencies() PRODUCT_RETURN; | |
| 692 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 693 void print_calls(outputStream* st) PRODUCT_RETURN; | |
| 694 void print_handler_table() PRODUCT_RETURN; | |
| 695 void print_nul_chk_table() PRODUCT_RETURN; | |
|
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696 void print_nmethod(bool print_code); |
| 0 | 697 |
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698 // need to re-define this from CodeBlob else the overload hides it |
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699 virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); } |
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700 void print_on(outputStream* st, const char* msg) const; |
| 0 | 701 |
| 702 // Logging | |
| 703 void log_identity(xmlStream* log) const; | |
| 704 void log_new_nmethod() const; | |
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705 void log_state_change() const; |
| 0 | 706 |
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707 // Prints block-level comments, including nmethod specific block labels: |
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708 virtual void print_block_comment(outputStream* stream, address block_begin) const { |
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709 print_nmethod_labels(stream, block_begin); |
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710 CodeBlob::print_block_comment(stream, block_begin); |
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711 } |
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712 void print_nmethod_labels(outputStream* stream, address block_begin) const; |
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713 |
| 0 | 714 // Prints a comment for one native instruction (reloc info, pc desc) |
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715 void print_code_comment_on(outputStream* st, int column, address begin, address end); |
| 0 | 716 static void print_statistics() PRODUCT_RETURN; |
| 717 | |
| 718 // Compiler task identification. Note that all OSR methods | |
| 719 // are numbered in an independent sequence if CICountOSR is true, | |
| 720 // and native method wrappers are also numbered independently if | |
| 721 // CICountNative is true. | |
| 722 int compile_id() const { return _compile_id; } | |
| 723 const char* compile_kind() const; | |
| 724 | |
| 725 // For debugging | |
| 726 // CompiledIC* IC_at(char* p) const; | |
| 727 // PrimitiveIC* primitiveIC_at(char* p) const; | |
| 728 oop embeddedOop_at(address p); | |
| 729 | |
| 730 // tells if any of this method's dependencies have been invalidated | |
| 731 // (this is expensive!) | |
| 732 bool check_all_dependencies(); | |
| 733 | |
| 734 // tells if this compiled method is dependent on the given changes, | |
| 735 // and the changes have invalidated it | |
| 736 bool check_dependency_on(DepChange& changes); | |
| 737 | |
| 738 // Evolution support. Tells if this compiled method is dependent on any of | |
| 739 // methods m() of class dependee, such that if m() in dependee is replaced, | |
| 740 // this compiled method will have to be deoptimized. | |
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741 bool is_evol_dependent_on(Klass* dependee); |
| 0 | 742 |
| 743 // Fast breakpoint support. Tells if this compiled method is | |
| 744 // dependent on the given method. Returns true if this nmethod | |
| 745 // corresponds to the given method as well. | |
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746 bool is_dependent_on_method(Method* dependee); |
| 0 | 747 |
| 748 // is it ok to patch at address? | |
| 749 bool is_patchable_at(address instr_address); | |
| 750 | |
| 751 // UseBiasedLocking support | |
| 2019 | 752 ByteSize native_receiver_sp_offset() { |
| 753 return _native_receiver_sp_offset; | |
| 0 | 754 } |
| 2019 | 755 ByteSize native_basic_lock_sp_offset() { |
| 756 return _native_basic_lock_sp_offset; | |
| 0 | 757 } |
| 758 | |
| 759 // support for code generation | |
| 760 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } | |
| 761 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } | |
| 762 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } | |
| 763 | |
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764 // RedefineClasses support. Mark metadata in nmethods as on_stack so that |
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765 // redefine classes doesn't purge it. |
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766 static void mark_on_stack(nmethod* nm) { |
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767 nm->metadata_do(Metadata::mark_on_stack); |
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768 } |
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769 void metadata_do(void f(Metadata*)); |
| 0 | 770 }; |
| 771 | |
|
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772 // Locks an nmethod so its code will not get removed and it will not |
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773 // be made into a zombie, even if it is a not_entrant method. After the |
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774 // nmethod becomes a zombie, if CompiledMethodUnload event processing |
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775 // needs to be done, then lock_nmethod() is used directly to keep the |
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776 // generated code from being reused too early. |
| 0 | 777 class nmethodLocker : public StackObj { |
| 778 nmethod* _nm; | |
| 779 | |
|
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780 public: |
|
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781 |
|
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782 // note: nm can be NULL |
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783 // Only JvmtiDeferredEvent::compiled_method_unload_event() |
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784 // should pass zombie_ok == true. |
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785 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); |
| 0 | 786 static void unlock_nmethod(nmethod* nm); // (ditto) |
| 787 | |
| 788 nmethodLocker(address pc); // derive nm from pc | |
| 789 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } | |
| 790 nmethodLocker() { _nm = NULL; } | |
| 791 ~nmethodLocker() { unlock_nmethod(_nm); } | |
| 792 | |
| 793 nmethod* code() { return _nm; } | |
| 794 void set_code(nmethod* new_nm) { | |
| 795 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. | |
| 796 _nm = new_nm; | |
| 797 lock_nmethod(_nm); | |
| 798 } | |
| 799 }; | |
| 1972 | 800 |
| 801 #endif // SHARE_VM_CODE_NMETHOD_HPP |