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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.inline.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
990 _method->method_holder()->external_name(),
991 _method->name()->as_C_string(),
992 _method->signature()->as_C_string(),
993 compile_id());
994 }
995 return check_evol.has_evol_dependency();
996 }
997
998 int nmethod::total_size() const {
999 return
1000 consts_size() +
1001 insts_size() +
1002 stub_size() +
1003 scopes_data_size() +
1004 scopes_pcs_size() +
1005 handler_table_size() +
1006 nul_chk_table_size();
1007 }
1008
1009 const char* nmethod::compile_kind() const {
1010 if (is_osr_method()) return "osr";
1011 if (method() != nullptr && is_native_method()) {
1012 if (method()->is_continuation_native_intrinsic()) {
1013 return "cnt";
1014 }
1015 return "c2n";
1016 }
1017 return nullptr;
1018 }
1019
1020 const char* nmethod::compiler_name() const {
1021 return compilertype2name(_compiler_type);
1022 }
1023
1024 #ifdef ASSERT
1025 class CheckForOopsClosure : public OopClosure {
1026 bool _found_oop = false;
1027 public:
1028 virtual void do_oop(oop* o) { _found_oop = true; }
1029 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1030 bool found_oop() { return _found_oop; }
1096 nm = new (native_nmethod_size, allow_NonNMethod_space)
1097 nmethod(method(), compiler_none, native_nmethod_size,
1098 compile_id, &offsets,
1099 code_buffer, frame_size,
1100 basic_lock_owner_sp_offset,
1101 basic_lock_sp_offset,
1102 oop_maps, mutable_data_size);
1103 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1104 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1105 }
1106
1107 if (nm != nullptr) {
1108 // verify nmethod
1109 DEBUG_ONLY(nm->verify();) // might block
1110
1111 nm->log_new_nmethod();
1112 }
1113 return nm;
1114 }
1115
1116 nmethod* nmethod::new_nmethod(const methodHandle& method,
1117 int compile_id,
1118 int entry_bci,
1119 CodeOffsets* offsets,
1120 int orig_pc_offset,
1121 DebugInformationRecorder* debug_info,
1122 Dependencies* dependencies,
1123 CodeBuffer* code_buffer, int frame_size,
1124 OopMapSet* oop_maps,
1125 ExceptionHandlerTable* handler_table,
1126 ImplicitExceptionTable* nul_chk_table,
1127 AbstractCompiler* compiler,
1128 CompLevel comp_level
1129 #if INCLUDE_JVMCI
1130 , char* speculations,
1131 int speculations_len,
1132 JVMCINMethodData* jvmci_data
1133 #endif
1134 )
1135 {
1162
1163 int mutable_data_size = required_mutable_data_size(code_buffer
1164 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1165
1166 {
1167 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1168
1169 nm = new (nmethod_size, comp_level)
1170 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1171 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1172 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1173 handler_table, nul_chk_table, compiler, comp_level
1174 #if INCLUDE_JVMCI
1175 , speculations,
1176 speculations_len,
1177 jvmci_data
1178 #endif
1179 );
1180
1181 if (nm != nullptr) {
1182 // To make dependency checking during class loading fast, record
1183 // the nmethod dependencies in the classes it is dependent on.
1184 // This allows the dependency checking code to simply walk the
1185 // class hierarchy above the loaded class, checking only nmethods
1186 // which are dependent on those classes. The slow way is to
1187 // check every nmethod for dependencies which makes it linear in
1188 // the number of methods compiled. For applications with a lot
1189 // classes the slow way is too slow.
1190 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1191 if (deps.type() == Dependencies::call_site_target_value) {
1192 // CallSite dependencies are managed on per-CallSite instance basis.
1193 oop call_site = deps.argument_oop(0);
1194 MethodHandles::add_dependent_nmethod(call_site, nm);
1195 } else {
1196 InstanceKlass* ik = deps.context_type();
1197 if (ik == nullptr) {
1198 continue; // ignore things like evol_method
1199 }
1200 // record this nmethod as dependent on this klass
1201 ik->add_dependent_nmethod(nm);
1202 }
1203 }
1204 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm));
1205 }
1206 }
1207 // Do verification and logging outside CodeCache_lock.
1208 if (nm != nullptr) {
1209 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1210 DEBUG_ONLY(nm->verify();)
1211 nm->log_new_nmethod();
1212 }
1213 return nm;
1214 }
1215
1216 // Fill in default values for various fields
1217 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1218 // avoid uninitialized fields, even for short time periods
1219 _exception_cache = nullptr;
1220 _gc_data = nullptr;
1221 _oops_do_mark_link = nullptr;
1222 _compiled_ic_data = nullptr;
1223
1224 _is_unloading_state = 0;
1225 _state = not_installed;
1226
1227 _has_unsafe_access = 0;
1228 _has_wide_vectors = 0;
1229 _has_monitors = 0;
1230 _has_scoped_access = 0;
1231 _has_flushed_dependencies = 0;
1232 _is_unlinked = 0;
1233 _load_reported = 0; // jvmti state
1234
1235 _deoptimization_status = not_marked;
1236
1237 // SECT_CONSTS is first in code buffer so the offset should be 0.
1238 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1239 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1240
1241 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1242
1243 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1244 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1245
1246 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1247 }
1248
1249 // Post initialization
1250 void nmethod::post_init() {
1251 clear_unloading_state();
1252
1253 finalize_relocations();
1254
1286 init_defaults(code_buffer, offsets);
1287
1288 _osr_entry_point = nullptr;
1289 _pc_desc_container = nullptr;
1290 _entry_bci = InvocationEntryBci;
1291 _compile_id = compile_id;
1292 _comp_level = CompLevel_none;
1293 _compiler_type = type;
1294 _orig_pc_offset = 0;
1295 _num_stack_arg_slots = 0;
1296
1297 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1298 // Continuation enter intrinsic
1299 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1300 } else {
1301 _exception_offset = 0;
1302 }
1303 // Native wrappers do not have deopt handlers. Make the values
1304 // something that will never match a pc like the nmethod vtable entry
1305 _deopt_handler_offset = 0;
1306 _unwind_handler_offset = 0;
1307
1308 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1309 uint16_t metadata_size;
1310 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1311 JVMCI_ONLY( _metadata_size = metadata_size; )
1312 assert(_mutable_data_size == _relocation_size + metadata_size,
1313 "wrong mutable data size: %d != %d + %d",
1314 _mutable_data_size, _relocation_size, metadata_size);
1315
1316 // native wrapper does not have read-only data but we need unique not null address
1317 _immutable_data = blob_end();
1318 _immutable_data_size = 0;
1319 _nul_chk_table_offset = 0;
1320 _handler_table_offset = 0;
1321 _scopes_pcs_offset = 0;
1322 _scopes_data_offset = 0;
1323 #if INCLUDE_JVMCI
1324 _speculations_offset = 0;
1325 #endif
1346 // This is both handled in decode2(), called via print_code() -> decode()
1347 if (PrintNativeNMethods) {
1348 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1349 print_code();
1350 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1351 #if defined(SUPPORT_DATA_STRUCTS)
1352 if (AbstractDisassembler::show_structs()) {
1353 if (oop_maps != nullptr) {
1354 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1355 oop_maps->print_on(tty);
1356 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1357 }
1358 }
1359 #endif
1360 } else {
1361 print(); // print the header part only.
1362 }
1363 #if defined(SUPPORT_DATA_STRUCTS)
1364 if (AbstractDisassembler::show_structs()) {
1365 if (PrintRelocations) {
1366 print_relocations();
1367 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1368 }
1369 }
1370 #endif
1371 if (xtty != nullptr) {
1372 xtty->tail("print_native_nmethod");
1373 }
1374 }
1375 }
1376
1377
1378 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size)
1379 {
1380
1381 if (nm._oop_maps != nullptr) {
1382 _oop_maps = nm._oop_maps->clone();
1383 } else {
1384 _oop_maps = nullptr;
1385 }
1386
1666 CompLevel comp_level
1667 #if INCLUDE_JVMCI
1668 , char* speculations,
1669 int speculations_len,
1670 JVMCINMethodData* jvmci_data
1671 #endif
1672 )
1673 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1674 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1675 _deoptimization_generation(0),
1676 _gc_epoch(CodeCache::gc_epoch()),
1677 _method(method),
1678 _osr_link(nullptr)
1679 {
1680 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1681 {
1682 DEBUG_ONLY(NoSafepointVerifier nsv;)
1683 assert_locked_or_safepoint(CodeCache_lock);
1684
1685 init_defaults(code_buffer, offsets);
1686
1687 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1688 _entry_bci = entry_bci;
1689 _compile_id = compile_id;
1690 _comp_level = comp_level;
1691 _compiler_type = type;
1692 _orig_pc_offset = orig_pc_offset;
1693
1694 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1695
1696 set_ctable_begin(header_begin() + content_offset());
1697
1698 #if INCLUDE_JVMCI
1699 if (compiler->is_jvmci()) {
1700 // JVMCI might not produce any stub sections
1701 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1702 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1703 } else {
1704 _exception_offset = -1;
1705 }
1788 // Copy speculations to nmethod
1789 if (speculations_size() != 0) {
1790 memcpy(speculations_begin(), speculations, speculations_len);
1791 }
1792 #endif
1793 init_immutable_data_ref_count();
1794
1795 post_init();
1796
1797 // we use the information of entry points to find out if a method is
1798 // static or non static
1799 assert(compiler->is_c2() || compiler->is_jvmci() ||
1800 _method->is_static() == (entry_point() == verified_entry_point()),
1801 " entry points must be same for static methods and vice versa");
1802 }
1803 }
1804
1805 // Print a short set of xml attributes to identify this nmethod. The
1806 // output should be embedded in some other element.
1807 void nmethod::log_identity(xmlStream* log) const {
1808 log->print(" compile_id='%d'", compile_id());
1809 const char* nm_kind = compile_kind();
1810 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1811 log->print(" compiler='%s'", compiler_name());
1812 if (TieredCompilation) {
1813 log->print(" level='%d'", comp_level());
1814 }
1815 #if INCLUDE_JVMCI
1816 if (jvmci_nmethod_data() != nullptr) {
1817 const char* jvmci_name = jvmci_nmethod_data()->name();
1818 if (jvmci_name != nullptr) {
1819 log->print(" jvmci_mirror_name='");
1820 log->text("%s", jvmci_name);
1821 log->print("'");
1822 }
1823 }
1824 #endif
1825 }
1826
1827
1828 #define LOG_OFFSET(log, name) \
1829 if (p2i(name##_end()) - p2i(name##_begin())) \
1830 log->print(" " XSTR(name) "_offset='%zd'" , \
1831 p2i(name##_begin()) - p2i(this))
1832
1833
1948 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1949 if (oop_maps() != nullptr) {
1950 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1951 oop_maps()->print_on(tty);
1952 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1953 }
1954 }
1955 #endif
1956 } else {
1957 print(); // print the header part only.
1958 }
1959
1960 #if defined(SUPPORT_DATA_STRUCTS)
1961 if (AbstractDisassembler::show_structs()) {
1962 methodHandle mh(Thread::current(), _method);
1963 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1964 print_scopes();
1965 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1966 }
1967 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1968 print_relocations();
1969 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1970 }
1971 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1972 print_dependencies_on(tty);
1973 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1974 }
1975 if (printmethod || PrintExceptionHandlers) {
1976 print_handler_table();
1977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1978 print_nul_chk_table();
1979 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1980 }
1981
1982 if (printmethod) {
1983 print_recorded_oops();
1984 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1985 print_recorded_metadata();
1986 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1987 }
1988 }
1989 #endif
1990
1991 if (xtty != nullptr) {
1992 xtty->tail("print_nmethod");
1993 }
1994 }
1995
1996
1997 // Promote one word from an assembly-time handle to a live embedded oop.
1998 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1999 if (handle == nullptr ||
2000 // As a special case, IC oops are initialized to 1 or -1.
2001 handle == (jobject) Universe::non_oop_word()) {
2002 *(void**)dest = handle;
2003 } else {
2004 *dest = JNIHandles::resolve_non_null(handle);
2005 }
2006 }
2007
2008
2009 // Have to have the same name because it's called by a template
2010 void nmethod::copy_values(GrowableArray<jobject>* array) {
2011 int length = array->length();
2012 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
2013 oop* dest = oops_begin();
2014 for (int index = 0 ; index < length; index++) {
2015 initialize_immediate_oop(&dest[index], array->at(index));
2016 }
2017
2018 // Now we can fix up all the oops in the code. We need to do this
2019 // in the code because the assembler uses jobjects as placeholders.
2020 // The code and relocations have already been initialized by the
2021 // CodeBlob constructor, so it is valid even at this early point to
2022 // iterate over relocations and patch the code.
2023 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
2024 }
2025
2026 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
2027 int length = array->length();
2035 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
2036 // re-patch all oop-bearing instructions, just in case some oops moved
2037 RelocIterator iter(this, begin, end);
2038 while (iter.next()) {
2039 if (iter.type() == relocInfo::oop_type) {
2040 oop_Relocation* reloc = iter.oop_reloc();
2041 if (initialize_immediates && reloc->oop_is_immediate()) {
2042 oop* dest = reloc->oop_addr();
2043 jobject obj = *reinterpret_cast<jobject*>(dest);
2044 initialize_immediate_oop(dest, obj);
2045 }
2046 // Refresh the oop-related bits of this instruction.
2047 reloc->fix_oop_relocation();
2048 } else if (iter.type() == relocInfo::metadata_type) {
2049 metadata_Relocation* reloc = iter.metadata_reloc();
2050 reloc->fix_metadata_relocation();
2051 }
2052 }
2053 }
2054
2055 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
2056 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
2057 intptr_t cbaddr = (intptr_t) nm;
2058 intptr_t offset = ((intptr_t) pc) - cbaddr;
2059
2060 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
2061 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
2062 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
2063 } else if (!nop->patch(oopmap_slot, offset)) {
2064 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
2065 }
2066 }
2067
2068 void nmethod::finalize_relocations() {
2069 NoSafepointVerifier nsv;
2070
2071 GrowableArray<NativeMovConstReg*> virtual_call_data;
2072
2073 // Make sure that post call nops fill in nmethod offsets eagerly so
2074 // we don't have to race with deoptimization
2201 // be alive the previous completed marking cycle.
2202 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2203 }
2204
2205 void nmethod::inc_decompile_count() {
2206 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2207 // Could be gated by ProfileTraps, but do not bother...
2208 #if INCLUDE_JVMCI
2209 if (jvmci_skip_profile_deopt()) {
2210 return;
2211 }
2212 #endif
2213 Method* m = method();
2214 if (m == nullptr) return;
2215 MethodData* mdo = m->method_data();
2216 if (mdo == nullptr) return;
2217 // There is a benign race here. See comments in methodData.hpp.
2218 mdo->inc_decompile_count();
2219 }
2220
2221 bool nmethod::try_transition(signed char new_state_int) {
2222 signed char new_state = new_state_int;
2223 assert_lock_strong(NMethodState_lock);
2224 signed char old_state = _state;
2225 if (old_state >= new_state) {
2226 // Ensure monotonicity of transitions.
2227 return false;
2228 }
2229 AtomicAccess::store(&_state, new_state);
2230 return true;
2231 }
2232
2233 void nmethod::invalidate_osr_method() {
2234 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2235 // Remove from list of active nmethods
2236 if (method() != nullptr) {
2237 method()->method_holder()->remove_osr_nmethod(this);
2238 }
2239 }
2240
2250 }
2251 }
2252
2253 ResourceMark rm;
2254 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2255 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2256
2257 CompileTask::print_ul(this, ss.freeze());
2258 if (PrintCompilation) {
2259 print_on_with_msg(tty, ss.freeze());
2260 }
2261 }
2262
2263 void nmethod::unlink_from_method() {
2264 if (method() != nullptr) {
2265 method()->unlink_code(this);
2266 }
2267 }
2268
2269 // Invalidate code
2270 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason) {
2271 // This can be called while the system is already at a safepoint which is ok
2272 NoSafepointVerifier nsv;
2273
2274 if (is_unloading()) {
2275 // If the nmethod is unloading, then it is already not entrant through
2276 // the nmethod entry barriers. No need to do anything; GC will unload it.
2277 return false;
2278 }
2279
2280 if (AtomicAccess::load(&_state) == not_entrant) {
2281 // Avoid taking the lock if already in required state.
2282 // This is safe from races because the state is an end-state,
2283 // which the nmethod cannot back out of once entered.
2284 // No need for fencing either.
2285 return false;
2286 }
2287
2288 {
2289 // Enter critical section. Does not block for safepoint.
2290 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2312 }
2313
2314 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2315 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2316 // If nmethod entry barriers are not supported, we won't mark
2317 // nmethods as on-stack when they become on-stack. So we
2318 // degrade to a less accurate flushing strategy, for now.
2319 mark_as_maybe_on_stack();
2320 }
2321
2322 // Change state
2323 bool success = try_transition(not_entrant);
2324 assert(success, "Transition can't fail");
2325
2326 // Log the transition once
2327 log_state_change(invalidation_reason);
2328
2329 // Remove nmethod from method.
2330 unlink_from_method();
2331
2332 } // leave critical region under NMethodState_lock
2333
2334 #if INCLUDE_JVMCI
2335 // Invalidate can't occur while holding the NMethodState_lock
2336 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2337 if (nmethod_data != nullptr) {
2338 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2339 }
2340 #endif
2341
2342 #ifdef ASSERT
2343 if (is_osr_method() && method() != nullptr) {
2344 // Make sure osr nmethod is invalidated, i.e. not on the list
2345 bool found = method()->method_holder()->remove_osr_nmethod(this);
2346 assert(!found, "osr nmethod should have been invalidated");
2347 }
2348 #endif
2349
2350 return true;
2351 }
2376 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2377 nmethod::InvalidationReason::UNLOADING_COLD :
2378 nmethod::InvalidationReason::UNLOADING);
2379 }
2380 #endif
2381
2382 // Post before flushing as jmethodID is being used
2383 post_compiled_method_unload();
2384
2385 // Register for flushing when it is safe. For concurrent class unloading,
2386 // that would be after the unloading handshake, and for STW class unloading
2387 // that would be when getting back to the VM thread.
2388 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2389 }
2390
2391 void nmethod::purge(bool unregister_nmethod) {
2392
2393 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2394
2395 // completely deallocate this method
2396 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2397
2398 LogTarget(Debug, codecache) lt;
2399 if (lt.is_enabled()) {
2400 ResourceMark rm;
2401 LogStream ls(lt);
2402 const char* method_name = method()->name()->as_C_string();
2403 const size_t codecache_capacity = CodeCache::capacity()/1024;
2404 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2405 ls.print("Flushing nmethod %6d/" INTPTR_FORMAT ", level=%d, osr=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2406 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2407 _compile_id, p2i(this), _comp_level, is_osr_method(), is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2408 codecache_capacity, codecache_free_space, method_name, compiler_name());
2409 }
2410
2411 // We need to deallocate any ExceptionCache data.
2412 // Note that we do not need to grab the nmethod lock for this, it
2413 // better be thread safe if we're disposing of it!
2414 ExceptionCache* ec = exception_cache();
2415 while(ec != nullptr) {
2416 ExceptionCache* next = ec->next();
2417 delete ec;
2418 ec = next;
2419 }
2420 if (_pc_desc_container != nullptr) {
2421 delete _pc_desc_container;
2422 }
2423 delete[] _compiled_ic_data;
2424
2425 if (_immutable_data != blob_end()) {
2426 // Free memory if this was the last nmethod referencing immutable data
2427 if (dec_immutable_data_ref_count() == 0) {
2428 os::free(_immutable_data);
2429 }
2430
2431 _immutable_data = blob_end(); // Valid not null address
2432 }
2433
2434 if (unregister_nmethod) {
2435 Universe::heap()->unregister_nmethod(this);
2436 }
2437 CodeCache::unregister_old_nmethod(this);
2438
2439 JVMCI_ONLY( _metadata_size = 0; )
2440 CodeBlob::purge();
2441 }
2442
2443 oop nmethod::oop_at(int index) const {
2444 if (index == 0) {
2445 return nullptr;
2472 MethodHandles::clean_dependency_context(call_site);
2473 } else {
2474 InstanceKlass* ik = deps.context_type();
2475 if (ik == nullptr) {
2476 continue; // ignore things like evol_method
2477 }
2478 // During GC liveness of dependee determines class that needs to be updated.
2479 // The GC may clean dependency contexts concurrently and in parallel.
2480 ik->clean_dependency_context();
2481 }
2482 }
2483 }
2484 }
2485
2486 void nmethod::post_compiled_method(CompileTask* task) {
2487 task->mark_success();
2488 task->set_nm_content_size(content_size());
2489 task->set_nm_insts_size(insts_size());
2490 task->set_nm_total_size(total_size());
2491
2492 // JVMTI -- compiled method notification (must be done outside lock)
2493 post_compiled_method_load_event();
2494
2495 if (CompilationLog::log() != nullptr) {
2496 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2497 }
2498
2499 const DirectiveSet* directive = task->directive();
2500 maybe_print_nmethod(directive);
2501 }
2502
2503 #if INCLUDE_CDS
2504 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2505
2506 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2507 precond(CDSConfig::is_using_aot_linked_classes());
2508 precond(!ServiceThread::has_started());
2509
2510 // We are still in single threaded stage of VM bootstrap. No need to lock.
2511 if (_delayed_compiled_method_load_events == nullptr) {
3228 void nmethod::verify() {
3229 if (is_not_entrant())
3230 return;
3231
3232 // assert(oopDesc::is_oop(method()), "must be valid");
3233
3234 ResourceMark rm;
3235
3236 if (!CodeCache::contains(this)) {
3237 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3238 }
3239
3240 if(is_native_method() )
3241 return;
3242
3243 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3244 if (nm != this) {
3245 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3246 }
3247
3248 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3249 if (! p->verify(this)) {
3250 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3251 }
3252 }
3253
3254 #ifdef ASSERT
3255 #if INCLUDE_JVMCI
3256 {
3257 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3258 ImmutableOopMapSet* oms = oop_maps();
3259 ImplicitExceptionTable implicit_table(this);
3260 for (uint i = 0; i < implicit_table.len(); i++) {
3261 int exec_offset = (int) implicit_table.get_exec_offset(i);
3262 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3263 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3264 bool found = false;
3265 for (int i = 0, imax = oms->count(); i < imax; i++) {
3266 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3267 found = true;
3268 break;
3269 }
3270 }
3271 assert(found, "missing oopmap");
3272 }
3273 }
3274 }
3275 #endif
3276 #endif
3277
3278 VerifyOopsClosure voc(this);
3279 oops_do(&voc);
3280 assert(voc.ok(), "embedded oops must be OK");
3281 Universe::heap()->verify_nmethod(this);
3282
3283 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3284 nm->method()->external_name(), p2i(_oops_do_mark_link));
3285 verify_scopes();
3286
3287 CompiledICLocker nm_verify(this);
3288 VerifyMetadataClosure vmc;
3289 metadata_do(&vmc);
3290 }
3291
3292
3293 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3294
3295 // Verify IC only when nmethod installation is finished.
3296 if (!is_not_installed()) {
3297 if (CompiledICLocker::is_safe(this)) {
3298 if (is_inline_cache) {
3299 CompiledIC_at(this, call_site);
3300 } else {
3301 CompiledDirectCall::at(call_site);
3302 }
3303 } else {
3304 CompiledICLocker ml_verify(this);
3305 if (is_inline_cache) {
3434 p2i(nul_chk_table_end()),
3435 nul_chk_table_size());
3436 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3437 p2i(handler_table_begin()),
3438 p2i(handler_table_end()),
3439 handler_table_size());
3440 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3441 p2i(scopes_pcs_begin()),
3442 p2i(scopes_pcs_end()),
3443 scopes_pcs_size());
3444 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3445 p2i(scopes_data_begin()),
3446 p2i(scopes_data_end()),
3447 scopes_data_size());
3448 #if INCLUDE_JVMCI
3449 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3450 p2i(speculations_begin()),
3451 p2i(speculations_end()),
3452 speculations_size());
3453 #endif
3454 }
3455
3456 void nmethod::print_code() {
3457 ResourceMark m;
3458 ttyLocker ttyl;
3459 // Call the specialized decode method of this class.
3460 decode(tty);
3461 }
3462
3463 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3464
3465 void nmethod::print_dependencies_on(outputStream* out) {
3466 ResourceMark rm;
3467 stringStream st;
3468 st.print_cr("Dependencies:");
3469 for (Dependencies::DepStream deps(this); deps.next(); ) {
3470 deps.print_dependency(&st);
3471 InstanceKlass* ctxk = deps.context_type();
3472 if (ctxk != nullptr) {
3473 if (ctxk->is_dependent_nmethod(this)) {
3533 st->print("scopes:");
3534 if (scopes_pcs_begin() < scopes_pcs_end()) {
3535 st->cr();
3536 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3537 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3538 continue;
3539
3540 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3541 while (sd != nullptr) {
3542 sd->print_on(st, p); // print output ends with a newline
3543 sd = sd->sender();
3544 }
3545 }
3546 } else {
3547 st->print_cr(" <list empty>");
3548 }
3549 }
3550 #endif
3551
3552 #ifndef PRODUCT // RelocIterator does support printing only then.
3553 void nmethod::print_relocations() {
3554 ResourceMark m; // in case methods get printed via the debugger
3555 tty->print_cr("relocations:");
3556 RelocIterator iter(this);
3557 iter.print_on(tty);
3558 }
3559 #endif
3560
3561 void nmethod::print_pcs_on(outputStream* st) {
3562 ResourceMark m; // in case methods get printed via debugger
3563 st->print("pc-bytecode offsets:");
3564 if (scopes_pcs_begin() < scopes_pcs_end()) {
3565 st->cr();
3566 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3567 p->print_on(st, this); // print output ends with a newline
3568 }
3569 } else {
3570 st->print_cr(" <list empty>");
3571 }
3572 }
3573
3574 void nmethod::print_handler_table() {
3575 ExceptionHandlerTable(this).print(code_begin());
3576 }
3577
4392 void nmethod::update_speculation(JavaThread* thread) {
4393 jlong speculation = thread->pending_failed_speculation();
4394 if (speculation != 0) {
4395 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4396 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4397 thread->set_pending_failed_speculation(0);
4398 }
4399 }
4400
4401 const char* nmethod::jvmci_name() {
4402 if (jvmci_nmethod_data() != nullptr) {
4403 return jvmci_nmethod_data()->name();
4404 }
4405 return nullptr;
4406 }
4407
4408 bool nmethod::jvmci_skip_profile_deopt() const {
4409 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4410 }
4411 #endif
|
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.inline.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "code/aotCodeCache.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.inline.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compilationLog.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/compilerOracle.hpp"
40 #include "compiler/compileTask.hpp"
41 #include "compiler/directivesParser.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "compiler/oopMap.inline.hpp"
44 #include "gc/shared/barrierSet.hpp"
45 #include "gc/shared/barrierSetNMethod.hpp"
46 #include "gc/shared/classUnloadingContext.hpp"
47 #include "gc/shared/collectedHeap.hpp"
991 _method->method_holder()->external_name(),
992 _method->name()->as_C_string(),
993 _method->signature()->as_C_string(),
994 compile_id());
995 }
996 return check_evol.has_evol_dependency();
997 }
998
999 int nmethod::total_size() const {
1000 return
1001 consts_size() +
1002 insts_size() +
1003 stub_size() +
1004 scopes_data_size() +
1005 scopes_pcs_size() +
1006 handler_table_size() +
1007 nul_chk_table_size();
1008 }
1009
1010 const char* nmethod::compile_kind() const {
1011 if (is_osr_method()) return "osr";
1012 if (preloaded()) return "AP";
1013 if (is_aot()) return "A";
1014
1015 if (method() != nullptr && is_native_method()) {
1016 if (method()->is_continuation_native_intrinsic()) {
1017 return "cnt";
1018 }
1019 return "c2n";
1020 }
1021 return nullptr;
1022 }
1023
1024 const char* nmethod::compiler_name() const {
1025 return compilertype2name(_compiler_type);
1026 }
1027
1028 #ifdef ASSERT
1029 class CheckForOopsClosure : public OopClosure {
1030 bool _found_oop = false;
1031 public:
1032 virtual void do_oop(oop* o) { _found_oop = true; }
1033 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1034 bool found_oop() { return _found_oop; }
1100 nm = new (native_nmethod_size, allow_NonNMethod_space)
1101 nmethod(method(), compiler_none, native_nmethod_size,
1102 compile_id, &offsets,
1103 code_buffer, frame_size,
1104 basic_lock_owner_sp_offset,
1105 basic_lock_sp_offset,
1106 oop_maps, mutable_data_size);
1107 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1108 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1109 }
1110
1111 if (nm != nullptr) {
1112 // verify nmethod
1113 DEBUG_ONLY(nm->verify();) // might block
1114
1115 nm->log_new_nmethod();
1116 }
1117 return nm;
1118 }
1119
1120 void nmethod::record_nmethod_dependency() {
1121 // To make dependency checking during class loading fast, record
1122 // the nmethod dependencies in the classes it is dependent on.
1123 // This allows the dependency checking code to simply walk the
1124 // class hierarchy above the loaded class, checking only nmethods
1125 // which are dependent on those classes. The slow way is to
1126 // check every nmethod for dependencies which makes it linear in
1127 // the number of methods compiled. For applications with a lot
1128 // classes the slow way is too slow.
1129 for (Dependencies::DepStream deps(this); deps.next(); ) {
1130 if (deps.type() == Dependencies::call_site_target_value) {
1131 // CallSite dependencies are managed on per-CallSite instance basis.
1132 oop call_site = deps.argument_oop(0);
1133 MethodHandles::add_dependent_nmethod(call_site, this);
1134 } else {
1135 InstanceKlass* ik = deps.context_type();
1136 if (ik == nullptr) {
1137 continue; // ignore things like evol_method
1138 }
1139 // record this nmethod as dependent on this klass
1140 ik->add_dependent_nmethod(this);
1141 }
1142 }
1143 }
1144
1145 nmethod* nmethod::new_nmethod(const methodHandle& method,
1146 int compile_id,
1147 int entry_bci,
1148 CodeOffsets* offsets,
1149 int orig_pc_offset,
1150 DebugInformationRecorder* debug_info,
1151 Dependencies* dependencies,
1152 CodeBuffer* code_buffer, int frame_size,
1153 OopMapSet* oop_maps,
1154 ExceptionHandlerTable* handler_table,
1155 ImplicitExceptionTable* nul_chk_table,
1156 AbstractCompiler* compiler,
1157 CompLevel comp_level
1158 #if INCLUDE_JVMCI
1159 , char* speculations,
1160 int speculations_len,
1161 JVMCINMethodData* jvmci_data
1162 #endif
1163 )
1164 {
1191
1192 int mutable_data_size = required_mutable_data_size(code_buffer
1193 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1194
1195 {
1196 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1197
1198 nm = new (nmethod_size, comp_level)
1199 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1200 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1201 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1202 handler_table, nul_chk_table, compiler, comp_level
1203 #if INCLUDE_JVMCI
1204 , speculations,
1205 speculations_len,
1206 jvmci_data
1207 #endif
1208 );
1209
1210 if (nm != nullptr) {
1211 nm->record_nmethod_dependency();
1212 NOT_PRODUCT(note_java_nmethod(nm));
1213 }
1214 }
1215 // Do verification and logging outside CodeCache_lock.
1216 if (nm != nullptr) {
1217
1218 #ifdef ASSERT
1219 LogTarget(Debug, aot, codecache, nmethod) log;
1220 if (log.is_enabled()) {
1221 LogStream out(log);
1222 out.print_cr("== new_nmethod 2");
1223 FlagSetting fs(PrintRelocations, true);
1224 nm->print_on_impl(&out);
1225 nm->decode(&out);
1226 }
1227 #endif
1228
1229 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1230 DEBUG_ONLY(nm->verify();)
1231 nm->log_new_nmethod();
1232 }
1233 return nm;
1234 }
1235
1236 nmethod* nmethod::restore(address code_cache_buffer,
1237 const methodHandle& method,
1238 int compile_id,
1239 address reloc_data,
1240 GrowableArray<Handle>& oop_list,
1241 GrowableArray<Metadata*>& metadata_list,
1242 ImmutableOopMapSet* oop_maps,
1243 address immutable_data,
1244 GrowableArray<Handle>& reloc_imm_oop_list,
1245 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1246 AOTCodeReader* aot_code_reader)
1247 {
1248 CodeBlob::restore(code_cache_buffer, "nmethod", reloc_data, oop_maps);
1249 nmethod* nm = (nmethod*)code_cache_buffer;
1250 nm->set_method(method());
1251 nm->_compile_id = compile_id;
1252 nm->set_immutable_data(immutable_data);
1253 nm->copy_values(&oop_list);
1254 nm->copy_values(&metadata_list);
1255
1256 aot_code_reader->fix_relocations(nm, &reloc_imm_oop_list, &reloc_imm_metadata_list);
1257
1258 #ifndef PRODUCT
1259 nm->asm_remarks().init();
1260 aot_code_reader->read_asm_remarks(nm->asm_remarks(), /* use_string_table */ false);
1261 nm->dbg_strings().init();
1262 aot_code_reader->read_dbg_strings(nm->dbg_strings(), /* use_string_table */ false);
1263 #endif
1264
1265 // Flush the code block
1266 ICache::invalidate_range(nm->code_begin(), nm->code_size());
1267
1268 // Create cache after PcDesc data is copied - it will be used to initialize cache
1269 nm->_pc_desc_container = new PcDescContainer(nm->scopes_pcs_begin());
1270
1271 nm->set_aot_code_entry(aot_code_reader->aot_code_entry());
1272
1273 nm->post_init();
1274 return nm;
1275 }
1276
1277 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1278 const methodHandle& method,
1279 AbstractCompiler* compiler,
1280 int compile_id,
1281 address reloc_data,
1282 GrowableArray<Handle>& oop_list,
1283 GrowableArray<Metadata*>& metadata_list,
1284 ImmutableOopMapSet* oop_maps,
1285 address immutable_data,
1286 GrowableArray<Handle>& reloc_imm_oop_list,
1287 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1288 AOTCodeReader* aot_code_reader)
1289 {
1290 nmethod* nm = nullptr;
1291 int nmethod_size = archived_nm->size();
1292 // create nmethod
1293 {
1294 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1295 address code_cache_buffer = (address)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1296 if (code_cache_buffer != nullptr) {
1297 nm = archived_nm->restore(code_cache_buffer,
1298 method,
1299 compile_id,
1300 reloc_data,
1301 oop_list,
1302 metadata_list,
1303 oop_maps,
1304 immutable_data,
1305 reloc_imm_oop_list,
1306 reloc_imm_metadata_list,
1307 aot_code_reader);
1308 nm->record_nmethod_dependency();
1309 NOT_PRODUCT(note_java_nmethod(nm));
1310 }
1311 }
1312 // Do verification and logging outside CodeCache_lock.
1313 if (nm != nullptr) {
1314 #ifdef ASSERT
1315 LogTarget(Debug, aot, codecache, nmethod) log;
1316 if (log.is_enabled()) {
1317 LogStream out(log);
1318 out.print_cr("== new_nmethod 2");
1319 FlagSetting fs(PrintRelocations, true);
1320 nm->print_on_impl(&out);
1321 nm->decode(&out);
1322 }
1323 #endif
1324 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1325 DEBUG_ONLY(nm->verify();)
1326 nm->log_new_nmethod();
1327 }
1328 return nm;
1329 }
1330
1331 // Fill in default values for various fields
1332 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1333 // avoid uninitialized fields, even for short time periods
1334 _exception_cache = nullptr;
1335 _gc_data = nullptr;
1336 _oops_do_mark_link = nullptr;
1337 _compiled_ic_data = nullptr;
1338
1339 _is_unloading_state = 0;
1340 _state = not_installed;
1341
1342 _has_unsafe_access = 0;
1343 _has_wide_vectors = 0;
1344 _has_monitors = 0;
1345 _has_scoped_access = 0;
1346 _has_flushed_dependencies = 0;
1347 _is_unlinked = 0;
1348 _load_reported = 0; // jvmti state
1349 _preloaded = 0;
1350 _has_clinit_barriers = 0;
1351
1352 _used = false;
1353 _deoptimization_status = not_marked;
1354
1355 // SECT_CONSTS is first in code buffer so the offset should be 0.
1356 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1357 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1358
1359 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1360
1361 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1362 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1363
1364 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1365 }
1366
1367 // Post initialization
1368 void nmethod::post_init() {
1369 clear_unloading_state();
1370
1371 finalize_relocations();
1372
1404 init_defaults(code_buffer, offsets);
1405
1406 _osr_entry_point = nullptr;
1407 _pc_desc_container = nullptr;
1408 _entry_bci = InvocationEntryBci;
1409 _compile_id = compile_id;
1410 _comp_level = CompLevel_none;
1411 _compiler_type = type;
1412 _orig_pc_offset = 0;
1413 _num_stack_arg_slots = 0;
1414
1415 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1416 // Continuation enter intrinsic
1417 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1418 } else {
1419 _exception_offset = 0;
1420 }
1421 // Native wrappers do not have deopt handlers. Make the values
1422 // something that will never match a pc like the nmethod vtable entry
1423 _deopt_handler_offset = 0;
1424 _aot_code_entry = nullptr;
1425 _method_profiling_count = 0;
1426 _unwind_handler_offset = 0;
1427
1428 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1429 uint16_t metadata_size;
1430 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1431 JVMCI_ONLY( _metadata_size = metadata_size; )
1432 assert(_mutable_data_size == _relocation_size + metadata_size,
1433 "wrong mutable data size: %d != %d + %d",
1434 _mutable_data_size, _relocation_size, metadata_size);
1435
1436 // native wrapper does not have read-only data but we need unique not null address
1437 _immutable_data = blob_end();
1438 _immutable_data_size = 0;
1439 _nul_chk_table_offset = 0;
1440 _handler_table_offset = 0;
1441 _scopes_pcs_offset = 0;
1442 _scopes_data_offset = 0;
1443 #if INCLUDE_JVMCI
1444 _speculations_offset = 0;
1445 #endif
1466 // This is both handled in decode2(), called via print_code() -> decode()
1467 if (PrintNativeNMethods) {
1468 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1469 print_code();
1470 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1471 #if defined(SUPPORT_DATA_STRUCTS)
1472 if (AbstractDisassembler::show_structs()) {
1473 if (oop_maps != nullptr) {
1474 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1475 oop_maps->print_on(tty);
1476 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1477 }
1478 }
1479 #endif
1480 } else {
1481 print(); // print the header part only.
1482 }
1483 #if defined(SUPPORT_DATA_STRUCTS)
1484 if (AbstractDisassembler::show_structs()) {
1485 if (PrintRelocations) {
1486 print_relocations_on(tty);
1487 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1488 }
1489 }
1490 #endif
1491 if (xtty != nullptr) {
1492 xtty->tail("print_native_nmethod");
1493 }
1494 }
1495 }
1496
1497
1498 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size)
1499 {
1500
1501 if (nm._oop_maps != nullptr) {
1502 _oop_maps = nm._oop_maps->clone();
1503 } else {
1504 _oop_maps = nullptr;
1505 }
1506
1786 CompLevel comp_level
1787 #if INCLUDE_JVMCI
1788 , char* speculations,
1789 int speculations_len,
1790 JVMCINMethodData* jvmci_data
1791 #endif
1792 )
1793 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1794 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1795 _deoptimization_generation(0),
1796 _gc_epoch(CodeCache::gc_epoch()),
1797 _method(method),
1798 _osr_link(nullptr)
1799 {
1800 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1801 {
1802 DEBUG_ONLY(NoSafepointVerifier nsv;)
1803 assert_locked_or_safepoint(CodeCache_lock);
1804
1805 init_defaults(code_buffer, offsets);
1806 _aot_code_entry = nullptr; // runtime compiled nmethod does not have AOTCodeEntry
1807 _method_profiling_count = 0;
1808
1809 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1810 _entry_bci = entry_bci;
1811 _compile_id = compile_id;
1812 _comp_level = comp_level;
1813 _compiler_type = type;
1814 _orig_pc_offset = orig_pc_offset;
1815
1816 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1817
1818 set_ctable_begin(header_begin() + content_offset());
1819
1820 #if INCLUDE_JVMCI
1821 if (compiler->is_jvmci()) {
1822 // JVMCI might not produce any stub sections
1823 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1824 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1825 } else {
1826 _exception_offset = -1;
1827 }
1910 // Copy speculations to nmethod
1911 if (speculations_size() != 0) {
1912 memcpy(speculations_begin(), speculations, speculations_len);
1913 }
1914 #endif
1915 init_immutable_data_ref_count();
1916
1917 post_init();
1918
1919 // we use the information of entry points to find out if a method is
1920 // static or non static
1921 assert(compiler->is_c2() || compiler->is_jvmci() ||
1922 _method->is_static() == (entry_point() == verified_entry_point()),
1923 " entry points must be same for static methods and vice versa");
1924 }
1925 }
1926
1927 // Print a short set of xml attributes to identify this nmethod. The
1928 // output should be embedded in some other element.
1929 void nmethod::log_identity(xmlStream* log) const {
1930 assert(log->inside_attrs_or_error(), "printing attributes");
1931 log->print(" compile_id='%d'", compile_id());
1932 const char* nm_kind = compile_kind();
1933 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1934 log->print(" compiler='%s'", compiler_name());
1935 if (TieredCompilation) {
1936 log->print(" compile_level='%d'", comp_level());
1937 }
1938 #if INCLUDE_JVMCI
1939 if (jvmci_nmethod_data() != nullptr) {
1940 const char* jvmci_name = jvmci_nmethod_data()->name();
1941 if (jvmci_name != nullptr) {
1942 log->print(" jvmci_mirror_name='");
1943 log->text("%s", jvmci_name);
1944 log->print("'");
1945 }
1946 }
1947 #endif
1948 }
1949
1950
1951 #define LOG_OFFSET(log, name) \
1952 if (p2i(name##_end()) - p2i(name##_begin())) \
1953 log->print(" " XSTR(name) "_offset='%zd'" , \
1954 p2i(name##_begin()) - p2i(this))
1955
1956
2071 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2072 if (oop_maps() != nullptr) {
2073 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
2074 oop_maps()->print_on(tty);
2075 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2076 }
2077 }
2078 #endif
2079 } else {
2080 print(); // print the header part only.
2081 }
2082
2083 #if defined(SUPPORT_DATA_STRUCTS)
2084 if (AbstractDisassembler::show_structs()) {
2085 methodHandle mh(Thread::current(), _method);
2086 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
2087 print_scopes();
2088 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2089 }
2090 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
2091 print_relocations_on(tty);
2092 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2093 }
2094 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
2095 print_dependencies_on(tty);
2096 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2097 }
2098 if (printmethod || PrintExceptionHandlers) {
2099 print_handler_table();
2100 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2101 print_nul_chk_table();
2102 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2103 }
2104
2105 if (printmethod) {
2106 print_recorded_oops();
2107 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2108 print_recorded_metadata();
2109 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2110 }
2111 }
2112 #endif
2113
2114 if (xtty != nullptr) {
2115 xtty->tail("print_nmethod");
2116 }
2117 }
2118
2119
2120 // Promote one word from an assembly-time handle to a live embedded oop.
2121 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
2122 if (handle == nullptr ||
2123 // As a special case, IC oops are initialized to 1 or -1.
2124 handle == (jobject) Universe::non_oop_word()) {
2125 *(void**)dest = handle;
2126 } else {
2127 *dest = JNIHandles::resolve_non_null(handle);
2128 }
2129 }
2130
2131 void nmethod::copy_values(GrowableArray<Handle>* array) {
2132 int length = array->length();
2133 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
2134 oop* dest = oops_begin();
2135 for (int index = 0 ; index < length; index++) {
2136 dest[index] = array->at(index)();
2137 }
2138 }
2139
2140 // Have to have the same name because it's called by a template
2141 void nmethod::copy_values(GrowableArray<jobject>* array) {
2142 int length = array->length();
2143 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
2144 oop* dest = oops_begin();
2145 for (int index = 0 ; index < length; index++) {
2146 initialize_immediate_oop(&dest[index], array->at(index));
2147 }
2148
2149 // Now we can fix up all the oops in the code. We need to do this
2150 // in the code because the assembler uses jobjects as placeholders.
2151 // The code and relocations have already been initialized by the
2152 // CodeBlob constructor, so it is valid even at this early point to
2153 // iterate over relocations and patch the code.
2154 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
2155 }
2156
2157 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
2158 int length = array->length();
2166 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
2167 // re-patch all oop-bearing instructions, just in case some oops moved
2168 RelocIterator iter(this, begin, end);
2169 while (iter.next()) {
2170 if (iter.type() == relocInfo::oop_type) {
2171 oop_Relocation* reloc = iter.oop_reloc();
2172 if (initialize_immediates && reloc->oop_is_immediate()) {
2173 oop* dest = reloc->oop_addr();
2174 jobject obj = *reinterpret_cast<jobject*>(dest);
2175 initialize_immediate_oop(dest, obj);
2176 }
2177 // Refresh the oop-related bits of this instruction.
2178 reloc->fix_oop_relocation();
2179 } else if (iter.type() == relocInfo::metadata_type) {
2180 metadata_Relocation* reloc = iter.metadata_reloc();
2181 reloc->fix_metadata_relocation();
2182 }
2183 }
2184 }
2185
2186 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
2187 RelocIterator iter(this);
2188 while (iter.next()) {
2189 if (iter.type() == relocInfo::oop_type) {
2190 oop_Relocation* reloc = iter.oop_reloc();
2191 if (reloc->oop_is_immediate()) {
2192 oop dest = reloc->oop_value();
2193 Handle h(thread, dest);
2194 oop_list.append(h);
2195 }
2196 } else if (iter.type() == relocInfo::metadata_type) {
2197 metadata_Relocation* reloc = iter.metadata_reloc();
2198 if (reloc->metadata_is_immediate()) {
2199 Metadata* m = reloc->metadata_value();
2200 metadata_list.append(m);
2201 }
2202 }
2203 }
2204 }
2205
2206 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
2207 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
2208 intptr_t cbaddr = (intptr_t) nm;
2209 intptr_t offset = ((intptr_t) pc) - cbaddr;
2210
2211 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
2212 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
2213 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
2214 } else if (!nop->patch(oopmap_slot, offset)) {
2215 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
2216 }
2217 }
2218
2219 void nmethod::finalize_relocations() {
2220 NoSafepointVerifier nsv;
2221
2222 GrowableArray<NativeMovConstReg*> virtual_call_data;
2223
2224 // Make sure that post call nops fill in nmethod offsets eagerly so
2225 // we don't have to race with deoptimization
2352 // be alive the previous completed marking cycle.
2353 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2354 }
2355
2356 void nmethod::inc_decompile_count() {
2357 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2358 // Could be gated by ProfileTraps, but do not bother...
2359 #if INCLUDE_JVMCI
2360 if (jvmci_skip_profile_deopt()) {
2361 return;
2362 }
2363 #endif
2364 Method* m = method();
2365 if (m == nullptr) return;
2366 MethodData* mdo = m->method_data();
2367 if (mdo == nullptr) return;
2368 // There is a benign race here. See comments in methodData.hpp.
2369 mdo->inc_decompile_count();
2370 }
2371
2372 void nmethod::inc_method_profiling_count() {
2373 AtomicAccess::inc(&_method_profiling_count);
2374 }
2375
2376 uint64_t nmethod::method_profiling_count() {
2377 return _method_profiling_count;
2378 }
2379
2380 bool nmethod::try_transition(signed char new_state_int) {
2381 signed char new_state = new_state_int;
2382 assert_lock_strong(NMethodState_lock);
2383 signed char old_state = _state;
2384 if (old_state >= new_state) {
2385 // Ensure monotonicity of transitions.
2386 return false;
2387 }
2388 AtomicAccess::store(&_state, new_state);
2389 return true;
2390 }
2391
2392 void nmethod::invalidate_osr_method() {
2393 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2394 // Remove from list of active nmethods
2395 if (method() != nullptr) {
2396 method()->method_holder()->remove_osr_nmethod(this);
2397 }
2398 }
2399
2409 }
2410 }
2411
2412 ResourceMark rm;
2413 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2414 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2415
2416 CompileTask::print_ul(this, ss.freeze());
2417 if (PrintCompilation) {
2418 print_on_with_msg(tty, ss.freeze());
2419 }
2420 }
2421
2422 void nmethod::unlink_from_method() {
2423 if (method() != nullptr) {
2424 method()->unlink_code(this);
2425 }
2426 }
2427
2428 // Invalidate code
2429 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason, bool keep_aot_entry) {
2430 // This can be called while the system is already at a safepoint which is ok
2431 NoSafepointVerifier nsv;
2432
2433 if (is_unloading()) {
2434 // If the nmethod is unloading, then it is already not entrant through
2435 // the nmethod entry barriers. No need to do anything; GC will unload it.
2436 return false;
2437 }
2438
2439 if (AtomicAccess::load(&_state) == not_entrant) {
2440 // Avoid taking the lock if already in required state.
2441 // This is safe from races because the state is an end-state,
2442 // which the nmethod cannot back out of once entered.
2443 // No need for fencing either.
2444 return false;
2445 }
2446
2447 {
2448 // Enter critical section. Does not block for safepoint.
2449 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2471 }
2472
2473 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2474 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2475 // If nmethod entry barriers are not supported, we won't mark
2476 // nmethods as on-stack when they become on-stack. So we
2477 // degrade to a less accurate flushing strategy, for now.
2478 mark_as_maybe_on_stack();
2479 }
2480
2481 // Change state
2482 bool success = try_transition(not_entrant);
2483 assert(success, "Transition can't fail");
2484
2485 // Log the transition once
2486 log_state_change(invalidation_reason);
2487
2488 // Remove nmethod from method.
2489 unlink_from_method();
2490
2491 if (!keep_aot_entry) {
2492 // Keep AOT code if it was simply replaced
2493 // otherwise make it not entrant too.
2494 AOTCodeCache::invalidate(_aot_code_entry);
2495 }
2496
2497 CompileBroker::log_not_entrant(this);
2498 } // leave critical region under NMethodState_lock
2499
2500 #if INCLUDE_JVMCI
2501 // Invalidate can't occur while holding the NMethodState_lock
2502 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2503 if (nmethod_data != nullptr) {
2504 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2505 }
2506 #endif
2507
2508 #ifdef ASSERT
2509 if (is_osr_method() && method() != nullptr) {
2510 // Make sure osr nmethod is invalidated, i.e. not on the list
2511 bool found = method()->method_holder()->remove_osr_nmethod(this);
2512 assert(!found, "osr nmethod should have been invalidated");
2513 }
2514 #endif
2515
2516 return true;
2517 }
2542 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2543 nmethod::InvalidationReason::UNLOADING_COLD :
2544 nmethod::InvalidationReason::UNLOADING);
2545 }
2546 #endif
2547
2548 // Post before flushing as jmethodID is being used
2549 post_compiled_method_unload();
2550
2551 // Register for flushing when it is safe. For concurrent class unloading,
2552 // that would be after the unloading handshake, and for STW class unloading
2553 // that would be when getting back to the VM thread.
2554 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2555 }
2556
2557 void nmethod::purge(bool unregister_nmethod) {
2558
2559 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2560
2561 // completely deallocate this method
2562 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, compile_kind(), p2i(this));
2563
2564 LogTarget(Debug, codecache) lt;
2565 if (lt.is_enabled()) {
2566 ResourceMark rm;
2567 LogStream ls(lt);
2568 const char* method_name = method()->name()->as_C_string();
2569 const size_t codecache_capacity = CodeCache::capacity()/1024;
2570 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2571 ls.print("Flushing %s nmethod %6d/" INTPTR_FORMAT ", level=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2572 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2573 compile_kind(), _compile_id, p2i(this), _comp_level, is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2574 codecache_capacity, codecache_free_space, method_name, compiler_name());
2575 }
2576
2577 // We need to deallocate any ExceptionCache data.
2578 // Note that we do not need to grab the nmethod lock for this, it
2579 // better be thread safe if we're disposing of it!
2580 ExceptionCache* ec = exception_cache();
2581 while(ec != nullptr) {
2582 ExceptionCache* next = ec->next();
2583 delete ec;
2584 ec = next;
2585 }
2586 if (_pc_desc_container != nullptr) {
2587 delete _pc_desc_container;
2588 }
2589 if (_compiled_ic_data != nullptr) {
2590 delete[] _compiled_ic_data;
2591 }
2592
2593 if (_immutable_data != blob_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2594 // Free memory if this was the last nmethod referencing immutable data
2595 if (dec_immutable_data_ref_count() == 0) {
2596 os::free(_immutable_data);
2597 }
2598
2599 _immutable_data = blob_end(); // Valid not null address
2600 }
2601
2602 if (unregister_nmethod) {
2603 Universe::heap()->unregister_nmethod(this);
2604 }
2605 CodeCache::unregister_old_nmethod(this);
2606
2607 JVMCI_ONLY( _metadata_size = 0; )
2608 CodeBlob::purge();
2609 }
2610
2611 oop nmethod::oop_at(int index) const {
2612 if (index == 0) {
2613 return nullptr;
2640 MethodHandles::clean_dependency_context(call_site);
2641 } else {
2642 InstanceKlass* ik = deps.context_type();
2643 if (ik == nullptr) {
2644 continue; // ignore things like evol_method
2645 }
2646 // During GC liveness of dependee determines class that needs to be updated.
2647 // The GC may clean dependency contexts concurrently and in parallel.
2648 ik->clean_dependency_context();
2649 }
2650 }
2651 }
2652 }
2653
2654 void nmethod::post_compiled_method(CompileTask* task) {
2655 task->mark_success();
2656 task->set_nm_content_size(content_size());
2657 task->set_nm_insts_size(insts_size());
2658 task->set_nm_total_size(total_size());
2659
2660 // task->is_aot_load() is true only for loaded AOT code.
2661 // nmethod::_aot_code_entry is set for loaded and stored AOT code
2662 // to invalidate the entry when nmethod is deoptimized.
2663 // VerifyAOTCode is option to not store in archive AOT code.
2664 guarantee((_aot_code_entry != nullptr) || !task->is_aot_load() || VerifyAOTCode, "sanity");
2665
2666 // JVMTI -- compiled method notification (must be done outside lock)
2667 post_compiled_method_load_event();
2668
2669 if (CompilationLog::log() != nullptr) {
2670 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2671 }
2672
2673 const DirectiveSet* directive = task->directive();
2674 maybe_print_nmethod(directive);
2675 }
2676
2677 #if INCLUDE_CDS
2678 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2679
2680 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2681 precond(CDSConfig::is_using_aot_linked_classes());
2682 precond(!ServiceThread::has_started());
2683
2684 // We are still in single threaded stage of VM bootstrap. No need to lock.
2685 if (_delayed_compiled_method_load_events == nullptr) {
3402 void nmethod::verify() {
3403 if (is_not_entrant())
3404 return;
3405
3406 // assert(oopDesc::is_oop(method()), "must be valid");
3407
3408 ResourceMark rm;
3409
3410 if (!CodeCache::contains(this)) {
3411 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3412 }
3413
3414 if(is_native_method() )
3415 return;
3416
3417 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3418 if (nm != this) {
3419 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3420 }
3421
3422 // Verification can triggered during shutdown after AOTCodeCache is closed.
3423 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3424 if (!is_aot() || AOTCodeCache::is_on()) {
3425 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3426 if (! p->verify(this)) {
3427 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3428 }
3429 }
3430
3431 #ifdef ASSERT
3432 #if INCLUDE_JVMCI
3433 {
3434 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3435 ImmutableOopMapSet* oms = oop_maps();
3436 ImplicitExceptionTable implicit_table(this);
3437 for (uint i = 0; i < implicit_table.len(); i++) {
3438 int exec_offset = (int) implicit_table.get_exec_offset(i);
3439 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3440 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3441 bool found = false;
3442 for (int i = 0, imax = oms->count(); i < imax; i++) {
3443 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3444 found = true;
3445 break;
3446 }
3447 }
3448 assert(found, "missing oopmap");
3449 }
3450 }
3451 }
3452 #endif
3453 #endif
3454 }
3455
3456 VerifyOopsClosure voc(this);
3457 oops_do(&voc);
3458 assert(voc.ok(), "embedded oops must be OK");
3459 Universe::heap()->verify_nmethod(this);
3460
3461 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3462 nm->method()->external_name(), p2i(_oops_do_mark_link));
3463 if (!is_aot() || AOTCodeCache::is_on()) {
3464 verify_scopes();
3465 }
3466
3467 CompiledICLocker nm_verify(this);
3468 VerifyMetadataClosure vmc;
3469 metadata_do(&vmc);
3470 }
3471
3472
3473 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3474
3475 // Verify IC only when nmethod installation is finished.
3476 if (!is_not_installed()) {
3477 if (CompiledICLocker::is_safe(this)) {
3478 if (is_inline_cache) {
3479 CompiledIC_at(this, call_site);
3480 } else {
3481 CompiledDirectCall::at(call_site);
3482 }
3483 } else {
3484 CompiledICLocker ml_verify(this);
3485 if (is_inline_cache) {
3614 p2i(nul_chk_table_end()),
3615 nul_chk_table_size());
3616 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3617 p2i(handler_table_begin()),
3618 p2i(handler_table_end()),
3619 handler_table_size());
3620 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3621 p2i(scopes_pcs_begin()),
3622 p2i(scopes_pcs_end()),
3623 scopes_pcs_size());
3624 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3625 p2i(scopes_data_begin()),
3626 p2i(scopes_data_end()),
3627 scopes_data_size());
3628 #if INCLUDE_JVMCI
3629 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3630 p2i(speculations_begin()),
3631 p2i(speculations_end()),
3632 speculations_size());
3633 #endif
3634 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3635 _aot_code_entry->print(st);
3636 }
3637 }
3638
3639 void nmethod::print_code() {
3640 ResourceMark m;
3641 ttyLocker ttyl;
3642 // Call the specialized decode method of this class.
3643 decode(tty);
3644 }
3645
3646 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3647
3648 void nmethod::print_dependencies_on(outputStream* out) {
3649 ResourceMark rm;
3650 stringStream st;
3651 st.print_cr("Dependencies:");
3652 for (Dependencies::DepStream deps(this); deps.next(); ) {
3653 deps.print_dependency(&st);
3654 InstanceKlass* ctxk = deps.context_type();
3655 if (ctxk != nullptr) {
3656 if (ctxk->is_dependent_nmethod(this)) {
3716 st->print("scopes:");
3717 if (scopes_pcs_begin() < scopes_pcs_end()) {
3718 st->cr();
3719 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3720 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3721 continue;
3722
3723 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3724 while (sd != nullptr) {
3725 sd->print_on(st, p); // print output ends with a newline
3726 sd = sd->sender();
3727 }
3728 }
3729 } else {
3730 st->print_cr(" <list empty>");
3731 }
3732 }
3733 #endif
3734
3735 #ifndef PRODUCT // RelocIterator does support printing only then.
3736 void nmethod::print_relocations_on(outputStream* st) {
3737 ResourceMark m; // in case methods get printed via the debugger
3738 st->print_cr("relocations:");
3739 RelocIterator iter(this);
3740 iter.print_on(st);
3741 }
3742 #endif
3743
3744 void nmethod::print_pcs_on(outputStream* st) {
3745 ResourceMark m; // in case methods get printed via debugger
3746 st->print("pc-bytecode offsets:");
3747 if (scopes_pcs_begin() < scopes_pcs_end()) {
3748 st->cr();
3749 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3750 p->print_on(st, this); // print output ends with a newline
3751 }
3752 } else {
3753 st->print_cr(" <list empty>");
3754 }
3755 }
3756
3757 void nmethod::print_handler_table() {
3758 ExceptionHandlerTable(this).print(code_begin());
3759 }
3760
4575 void nmethod::update_speculation(JavaThread* thread) {
4576 jlong speculation = thread->pending_failed_speculation();
4577 if (speculation != 0) {
4578 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4579 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4580 thread->set_pending_failed_speculation(0);
4581 }
4582 }
4583
4584 const char* nmethod::jvmci_name() {
4585 if (jvmci_nmethod_data() != nullptr) {
4586 return jvmci_nmethod_data()->name();
4587 }
4588 return nullptr;
4589 }
4590
4591 bool nmethod::jvmci_skip_profile_deopt() const {
4592 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4593 }
4594 #endif
4595
4596 void nmethod::prepare_for_archiving_impl() {
4597 CodeBlob::prepare_for_archiving_impl();
4598 _deoptimization_generation = 0;
4599 _gc_epoch = 0;
4600 _method_profiling_count = 0;
4601 _osr_link = nullptr;
4602 _method = nullptr;
4603 _immutable_data = nullptr;
4604 _pc_desc_container = nullptr;
4605 _exception_cache = nullptr;
4606 _gc_data = nullptr;
4607 _oops_do_mark_link = nullptr;
4608 _compiled_ic_data = nullptr;
4609 _osr_entry_point = nullptr;
4610 _compile_id = -1;
4611 _deoptimization_status = not_marked;
4612 _is_unloading_state = 0;
4613 _state = not_installed;
4614 }
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