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src/hotspot/share/oops/method.cpp

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  40 #include "interpreter/interpreter.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "logging/log.hpp"
  43 #include "logging/logTag.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.inline.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/metaspaceClosure.hpp"
  48 #include "memory/oopFactory.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "memory/universe.hpp"
  51 #include "oops/constMethod.hpp"
  52 #include "oops/constantPool.hpp"
  53 #include "oops/klass.inline.hpp"
  54 #include "oops/method.inline.hpp"
  55 #include "oops/methodData.hpp"
  56 #include "oops/objArrayKlass.hpp"
  57 #include "oops/objArrayOop.inline.hpp"
  58 #include "oops/oop.inline.hpp"
  59 #include "oops/symbol.hpp"

  60 #include "prims/jvmtiExport.hpp"
  61 #include "prims/methodHandles.hpp"
  62 #include "runtime/arguments.hpp"
  63 #include "runtime/atomic.hpp"
  64 #include "runtime/continuationEntry.hpp"
  65 #include "runtime/frame.inline.hpp"
  66 #include "runtime/handles.inline.hpp"
  67 #include "runtime/init.hpp"
  68 #include "runtime/orderAccess.hpp"
  69 #include "runtime/relocator.hpp"
  70 #include "runtime/safepointVerifiers.hpp"
  71 #include "runtime/sharedRuntime.hpp"
  72 #include "runtime/signature.hpp"
  73 #include "runtime/vm_version.hpp"
  74 #include "services/memTracker.hpp"
  75 #include "utilities/align.hpp"
  76 #include "utilities/quickSort.hpp"
  77 #include "utilities/vmError.hpp"
  78 #include "utilities/xmlstream.hpp"
  79 

 103   set_access_flags(access_flags);
 104   set_intrinsic_id(vmIntrinsics::_none);
 105   set_force_inline(false);
 106   set_hidden(false);
 107   set_dont_inline(false);
 108   set_changes_current_thread(false);
 109   set_has_injected_profile(false);
 110   set_method_data(NULL);
 111   clear_method_counters();
 112   set_vtable_index(Method::garbage_vtable_index);
 113 
 114   // Fix and bury in Method*
 115   set_interpreter_entry(NULL); // sets i2i entry and from_int
 116   set_adapter_entry(NULL);
 117   Method::clear_code(); // from_c/from_i get set to c2i/i2i
 118 
 119   if (access_flags.is_native()) {
 120     clear_native_function();
 121     set_signature_handler(NULL);
 122   }
 123 
 124   NOT_PRODUCT(set_compiled_invocation_count(0);)
 125   // Name is very useful for debugging.
 126   NOT_PRODUCT(_name = name;)
 127 }
 128 
 129 // Release Method*.  The nmethod will be gone when we get here because
 130 // we've walked the code cache.
 131 void Method::deallocate_contents(ClassLoaderData* loader_data) {
 132   MetadataFactory::free_metadata(loader_data, constMethod());
 133   set_constMethod(NULL);
 134   MetadataFactory::free_metadata(loader_data, method_data());
 135   set_method_data(NULL);
 136   MetadataFactory::free_metadata(loader_data, method_counters());
 137   clear_method_counters();
 138   // The nmethod will be gone when we get here.
 139   if (code() != NULL) _code = NULL;
 140 }
 141 
 142 void Method::release_C_heap_structures() {
 143   if (method_data()) {
 144     method_data()->release_C_heap_structures();
 145 
 146     // Destroy MethodData embedded lock
 147     method_data()->~MethodData();
 148   }
 149 }
 150 
 151 address Method::get_i2c_entry() {
 152   assert(adapter() != NULL, "must have");
 153   return adapter()->get_i2c_entry();
 154 }
 155 
 156 address Method::get_c2i_entry() {
 157   assert(adapter() != NULL, "must have");
 158   return adapter()->get_c2i_entry();
 159 }
 160 





 161 address Method::get_c2i_unverified_entry() {
 162   assert(adapter() != NULL, "must have");
 163   return adapter()->get_c2i_unverified_entry();
 164 }
 165 





 166 address Method::get_c2i_no_clinit_check_entry() {
 167   assert(VM_Version::supports_fast_class_init_checks(), "");
 168   assert(adapter() != NULL, "must have");
 169   return adapter()->get_c2i_no_clinit_check_entry();
 170 }
 171 
 172 char* Method::name_and_sig_as_C_string() const {
 173   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
 174 }
 175 
 176 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
 177   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
 178 }
 179 
 180 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
 181   const char* klass_name = klass->external_name();
 182   int klass_name_len  = (int)strlen(klass_name);
 183   int method_name_len = method_name->utf8_length();
 184   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();
 185   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);

 652 }
 653 
 654 int Method::extra_stack_words() {
 655   // not an inline function, to avoid a header dependency on Interpreter
 656   return extra_stack_entries() * Interpreter::stackElementSize;
 657 }
 658 
 659 // Derive size of parameters, return type, and fingerprint,
 660 // all in one pass, which is run at load time.
 661 // We need the first two, and might as well grab the third.
 662 void Method::compute_from_signature(Symbol* sig) {
 663   // At this point, since we are scanning the signature,
 664   // we might as well compute the whole fingerprint.
 665   Fingerprinter fp(sig, is_static());
 666   set_size_of_parameters(fp.size_of_parameters());
 667   set_num_stack_arg_slots(fp.num_stack_arg_slots());
 668   constMethod()->set_result_type(fp.return_type());
 669   constMethod()->set_fingerprint(fp.fingerprint());
 670 }
 671 













 672 bool Method::is_vanilla_constructor() const {
 673   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
 674   // which only calls the superclass vanilla constructor and possibly does stores of
 675   // zero constants to local fields:
 676   //
 677   //   aload_0
 678   //   invokespecial
 679   //   indexbyte1
 680   //   indexbyte2
 681   //
 682   // followed by an (optional) sequence of:
 683   //
 684   //   aload_0
 685   //   aconst_null / iconst_0 / fconst_0 / dconst_0
 686   //   putfield
 687   //   indexbyte1
 688   //   indexbyte2
 689   //
 690   // followed by:
 691   //
 692   //   return
 693 
 694   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
 695   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
 696   int size = code_size();
 697   // Check if size match
 698   if (size == 0 || size % 5 != 0) return false;
 699   address cb = code_base();
 700   int last = size - 1;
 701   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {

 702     // Does not call superclass default constructor
 703     return false;
 704   }
 705   // Check optional sequence
 706   for (int i = 4; i < last; i += 5) {
 707     if (cb[i] != Bytecodes::_aload_0) return false;
 708     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
 709     if (cb[i+2] != Bytecodes::_putfield) return false;
 710   }
 711   return true;
 712 }
 713 
 714 
 715 bool Method::compute_has_loops_flag() {
 716   BytecodeStream bcs(methodHandle(Thread::current(), this));
 717   Bytecodes::Code bc;
 718 
 719   while ((bc = bcs.next()) >= 0) {
 720     switch (bc) {
 721       case Bytecodes::_ifeq:

 839 
 840 bool Method::is_accessor() const {
 841   return is_getter() || is_setter();
 842 }
 843 
 844 bool Method::is_getter() const {
 845   if (code_size() != 5) return false;
 846   if (size_of_parameters() != 1) return false;
 847   if (java_code_at(0) != Bytecodes::_aload_0)  return false;
 848   if (java_code_at(1) != Bytecodes::_getfield) return false;
 849   switch (java_code_at(4)) {
 850     case Bytecodes::_ireturn:
 851     case Bytecodes::_lreturn:
 852     case Bytecodes::_freturn:
 853     case Bytecodes::_dreturn:
 854     case Bytecodes::_areturn:
 855       break;
 856     default:
 857       return false;
 858   }





 859   return true;
 860 }
 861 
 862 bool Method::is_setter() const {
 863   if (code_size() != 6) return false;
 864   if (java_code_at(0) != Bytecodes::_aload_0) return false;
 865   switch (java_code_at(1)) {
 866     case Bytecodes::_iload_1:
 867     case Bytecodes::_aload_1:
 868     case Bytecodes::_fload_1:
 869       if (size_of_parameters() != 2) return false;
 870       break;
 871     case Bytecodes::_dload_1:
 872     case Bytecodes::_lload_1:
 873       if (size_of_parameters() != 3) return false;
 874       break;
 875     default:
 876       return false;
 877   }
 878   if (java_code_at(2) != Bytecodes::_putfield) return false;
 879   if (java_code_at(5) != Bytecodes::_return)   return false;





 880   return true;
 881 }
 882 
 883 bool Method::is_constant_getter() const {
 884   int last_index = code_size() - 1;
 885   // Check if the first 1-3 bytecodes are a constant push
 886   // and the last bytecode is a return.
 887   return (2 <= code_size() && code_size() <= 4 &&
 888           Bytecodes::is_const(java_code_at(0)) &&
 889           Bytecodes::length_for(java_code_at(0)) == last_index &&
 890           Bytecodes::is_return(java_code_at(last_index)));

 891 }
 892 
 893 bool Method::is_initializer() const {
 894   return is_object_initializer() || is_static_initializer();
 895 }
 896 
 897 bool Method::has_valid_initializer_flags() const {
 898   return (is_static() ||
 899           method_holder()->major_version() < 51);
 900 }
 901 
 902 bool Method::is_static_initializer() const {
 903   // For classfiles version 51 or greater, ensure that the clinit method is
 904   // static.  Non-static methods with the name "<clinit>" are not static
 905   // initializers. (older classfiles exempted for backward compatibility)
 906   return name() == vmSymbols::class_initializer_name() &&
 907          has_valid_initializer_flags();

 908 }
 909 
 910 bool Method::is_object_initializer() const {
 911    return name() == vmSymbols::object_initializer_name();






 912 }
 913 
 914 bool Method::needs_clinit_barrier() const {
 915   return is_static() && !method_holder()->is_initialized();
 916 }
 917 
 918 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
 919   int length = method->checked_exceptions_length();
 920   if (length == 0) {  // common case
 921     return objArrayHandle(THREAD, Universe::the_empty_class_array());
 922   } else {
 923     methodHandle h_this(THREAD, method);
 924     objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
 925     objArrayHandle mirrors (THREAD, m_oop);
 926     for (int i = 0; i < length; i++) {
 927       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
 928       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
 929       if (log_is_enabled(Warning, exceptions) &&
 930           !k->is_subclass_of(vmClasses::Throwable_klass())) {
 931         ResourceMark rm(THREAD);

 949     // Not necessarily sorted and not necessarily one-to-one.
 950     CompressedLineNumberReadStream stream(compressed_linenumber_table());
 951     while (stream.read_pair()) {
 952       if (stream.bci() == bci) {
 953         // perfect match
 954         return stream.line();
 955       } else {
 956         // update best_bci/line
 957         if (stream.bci() < bci && stream.bci() >= best_bci) {
 958           best_bci  = stream.bci();
 959           best_line = stream.line();
 960         }
 961       }
 962     }
 963   }
 964   return best_line;
 965 }
 966 
 967 
 968 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
 969   if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
 970     Thread *thread = Thread::current();
 971     Symbol* klass_name = constants()->klass_name_at(klass_index);
 972     Handle loader(thread, method_holder()->class_loader());
 973     Handle prot  (thread, method_holder()->protection_domain());
 974     return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != NULL;
 975   } else {
 976     return true;
 977   }
 978 }
 979 
 980 
 981 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
 982   int klass_index = constants()->klass_ref_index_at(refinfo_index);
 983   if (must_be_resolved) {
 984     // Make sure klass is resolved in constantpool.
 985     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;


 986   }
 987   return is_klass_loaded_by_klass_index(klass_index);
 988 }
 989 
 990 
 991 void Method::set_native_function(address function, bool post_event_flag) {
 992   assert(function != NULL, "use clear_native_function to unregister natives");
 993   assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
 994   address* native_function = native_function_addr();
 995 
 996   // We can see racers trying to place the same native function into place. Once
 997   // is plenty.
 998   address current = *native_function;
 999   if (current == function) return;
1000   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1001       function != NULL) {
1002     // native_method_throw_unsatisfied_link_error_entry() should only
1003     // be passed when post_event_flag is false.
1004     assert(function !=
1005       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),

1134 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1135   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1136   if (comp_level == CompLevel_all) {
1137     set_not_c1_osr_compilable();
1138     set_not_c2_osr_compilable();
1139   } else {
1140     if (is_c1_compile(comp_level))
1141       set_not_c1_osr_compilable();
1142     if (is_c2_compile(comp_level))
1143       set_not_c2_osr_compilable();
1144   }
1145   assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1146 }
1147 
1148 // Revert to using the interpreter and clear out the nmethod
1149 void Method::clear_code() {
1150   // this may be NULL if c2i adapters have not been made yet
1151   // Only should happen at allocate time.
1152   if (adapter() == NULL) {
1153     _from_compiled_entry    = NULL;


1154   } else {
1155     _from_compiled_entry    = adapter()->get_c2i_entry();


1156   }
1157   OrderAccess::storestore();
1158   _from_interpreted_entry = _i2i_entry;
1159   OrderAccess::storestore();
1160   _code = NULL;
1161 }
1162 
1163 void Method::unlink_code(CompiledMethod *compare) {
1164   MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1165   // We need to check if either the _code or _from_compiled_code_entry_point
1166   // refer to this nmethod because there is a race in setting these two fields
1167   // in Method* as seen in bugid 4947125.
1168   if (code() == compare ||
1169       from_compiled_entry() == compare->verified_entry_point()) {
1170     clear_code();
1171   }
1172 }
1173 
1174 void Method::unlink_code() {
1175   MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1176   clear_code();
1177 }
1178 
1179 #if INCLUDE_CDS
1180 // Called by class data sharing to remove any entry points (which are not shared)
1181 void Method::unlink_method() {
1182   Arguments::assert_is_dumping_archive();
1183   _code = NULL;
1184   _adapter = NULL;
1185   _i2i_entry = NULL;
1186   _from_compiled_entry = NULL;


1187   _from_interpreted_entry = NULL;
1188 
1189   if (is_native()) {
1190     *native_function_addr() = NULL;
1191     set_signature_handler(NULL);
1192   }
1193   NOT_PRODUCT(set_compiled_invocation_count(0);)
1194 
1195   set_method_data(NULL);
1196   clear_method_counters();
1197 }
1198 #endif
1199 
1200 // Called when the method_holder is getting linked. Setup entrypoints so the method
1201 // is ready to be called from interpreter, compiler, and vtables.
1202 void Method::link_method(const methodHandle& h_method, TRAPS) {
1203   // If the code cache is full, we may reenter this function for the
1204   // leftover methods that weren't linked.
1205   if (adapter() != NULL) {
1206     return;
1207   }
1208   assert( _code == NULL, "nothing compiled yet" );
1209 
1210   // Setup interpreter entrypoint
1211   assert(this == h_method(), "wrong h_method()" );
1212 
1213   assert(adapter() == NULL, "init'd to NULL");
1214   address entry = Interpreter::entry_for_method(h_method);
1215   assert(entry != NULL, "interpreter entry must be non-null");
1216   // Sets both _i2i_entry and _from_interpreted_entry
1217   set_interpreter_entry(entry);
1218 
1219   // Don't overwrite already registered native entries.
1220   if (is_native() && !has_native_function()) {
1221     set_native_function(
1222       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1223       !native_bind_event_is_interesting);
1224   }



1225 
1226   // Setup compiler entrypoint.  This is made eagerly, so we do not need
1227   // special handling of vtables.  An alternative is to make adapters more
1228   // lazily by calling make_adapter() from from_compiled_entry() for the
1229   // normal calls.  For vtable calls life gets more complicated.  When a
1230   // call-site goes mega-morphic we need adapters in all methods which can be
1231   // called from the vtable.  We need adapters on such methods that get loaded
1232   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
1233   // problem we'll make these lazily later.
1234   (void) make_adapters(h_method, CHECK);
1235 
1236   // ONLY USE the h_method now as make_adapter may have blocked
1237 
1238   if (h_method->is_continuation_native_intrinsic()) {
1239     // the entry points to this method will be set in set_code, called when first resolving this method
1240     _from_interpreted_entry = NULL;
1241     _from_compiled_entry = NULL;
1242     _i2i_entry = NULL;
1243   }
1244 }
1245 
1246 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1247   // Adapters for compiled code are made eagerly here.  They are fairly
1248   // small (generally < 100 bytes) and quick to make (and cached and shared)
1249   // so making them eagerly shouldn't be too expensive.
1250   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1251   if (adapter == NULL ) {
1252     if (!is_init_completed()) {
1253       // Don't throw exceptions during VM initialization because java.lang.* classes
1254       // might not have been initialized, causing problems when constructing the
1255       // Java exception object.
1256       vm_exit_during_initialization("Out of space in CodeCache for adapters");
1257     } else {
1258       THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1259     }
1260   }
1261 
1262   mh->set_adapter_entry(adapter);
1263   mh->_from_compiled_entry = adapter->get_c2i_entry();


1264   return adapter->get_c2i_entry();
1265 }
1266 
1267 // The verified_code_entry() must be called when a invoke is resolved
1268 // on this method.
1269 
1270 // It returns the compiled code entry point, after asserting not null.
1271 // This function is called after potential safepoints so that nmethod
1272 // or adapter that it points to is still live and valid.
1273 // This function must not hit a safepoint!
1274 address Method::verified_code_entry() {
1275   debug_only(NoSafepointVerifier nsv;)
1276   assert(_from_compiled_entry != NULL, "must be set");
1277   return _from_compiled_entry;
1278 }
1279 












1280 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1281 // (could be racing a deopt).
1282 // Not inline to avoid circular ref.
1283 bool Method::check_code() const {
1284   // cached in a register or local.  There's a race on the value of the field.
1285   CompiledMethod *code = Atomic::load_acquire(&_code);
1286   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1287 }
1288 
1289 // Install compiled code.  Instantly it can execute.
1290 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1291   assert_lock_strong(CompiledMethod_lock);
1292   assert( code, "use clear_code to remove code" );
1293   assert( mh->check_code(), "" );
1294 
1295   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1296 
1297   // These writes must happen in this order, because the interpreter will
1298   // directly jump to from_interpreted_entry which jumps to an i2c adapter
1299   // which jumps to _from_compiled_entry.
1300   mh->_code = code;             // Assign before allowing compiled code to exec
1301 
1302   int comp_level = code->comp_level();
1303   // In theory there could be a race here. In practice it is unlikely
1304   // and not worth worrying about.
1305   if (comp_level > mh->highest_comp_level()) {
1306     mh->set_highest_comp_level(comp_level);
1307   }
1308 
1309   OrderAccess::storestore();
1310   mh->_from_compiled_entry = code->verified_entry_point();


1311   OrderAccess::storestore();
1312 
1313   if (mh->is_continuation_native_intrinsic()) {
1314     assert(mh->_from_interpreted_entry == NULL, "initialized incorrectly"); // see link_method
1315 
1316     if (mh->is_continuation_enter_intrinsic()) {
1317       // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1318       mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1319     } else if (mh->is_continuation_yield_intrinsic()) {
1320       mh->_i2i_entry = mh->get_i2c_entry();
1321     } else {
1322       guarantee(false, "Unknown Continuation native intrinsic");
1323     }
1324     // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1325     Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1326   } else if (!mh->is_method_handle_intrinsic()) {
1327     // Instantly compiled code can execute.
1328     mh->_from_interpreted_entry = mh->get_i2c_entry();
1329   }
1330 }

2267 }
2268 
2269 // Check that this pointer is valid by checking that the vtbl pointer matches
2270 bool Method::is_valid_method(const Method* m) {
2271   if (m == NULL) {
2272     return false;
2273   } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2274     // Quick sanity check on pointer.
2275     return false;
2276   } else if (!os::is_readable_range(m, m + 1)) {
2277     return false;
2278   } else if (m->is_shared()) {
2279     return CppVtables::is_valid_shared_method(m);
2280   } else if (Metaspace::contains_non_shared(m)) {
2281     return has_method_vptr((const void*)m);
2282   } else {
2283     return false;
2284   }
2285 }
2286 

























2287 #ifndef PRODUCT
2288 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2289   out->print("%d", loader_data->jmethod_ids()->count_methods());
2290 }
2291 #endif // PRODUCT
2292 
2293 
2294 // Printing
2295 
2296 #ifndef PRODUCT
2297 
2298 void Method::print_on(outputStream* st) const {
2299   ResourceMark rm;
2300   assert(is_method(), "must be method");
2301   st->print_cr("%s", internal_name());
2302   st->print_cr(" - this oop:          " PTR_FORMAT, p2i(this));
2303   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
2304   st->print   (" - constants:         " PTR_FORMAT " ", p2i(constants()));
2305   constants()->print_value_on(st); st->cr();
2306   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2307   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
2308   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
2309   st->print_cr(" - max stack:         %d",   max_stack());
2310   st->print_cr(" - max locals:        %d",   max_locals());
2311   st->print_cr(" - size of params:    %d",   size_of_parameters());
2312   st->print_cr(" - method size:       %d",   method_size());
2313   if (intrinsic_id() != vmIntrinsics::_none)
2314     st->print_cr(" - intrinsic id:      %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2315   if (highest_comp_level() != CompLevel_none)
2316     st->print_cr(" - highest level:     %d", highest_comp_level());
2317   st->print_cr(" - vtable index:      %d",   _vtable_index);




2318   st->print_cr(" - i2i entry:         " PTR_FORMAT, p2i(interpreter_entry()));
2319   st->print(   " - adapters:          ");
2320   AdapterHandlerEntry* a = ((Method*)this)->adapter();
2321   if (a == NULL)
2322     st->print_cr(PTR_FORMAT, p2i(a));
2323   else
2324     a->print_adapter_on(st);
2325   st->print_cr(" - compiled entry     " PTR_FORMAT, p2i(from_compiled_entry()));


2326   st->print_cr(" - code size:         %d",   code_size());
2327   if (code_size() != 0) {
2328     st->print_cr(" - code start:        " PTR_FORMAT, p2i(code_base()));
2329     st->print_cr(" - code end (excl):   " PTR_FORMAT, p2i(code_base() + code_size()));
2330   }
2331   if (method_data() != NULL) {
2332     st->print_cr(" - method data:       " PTR_FORMAT, p2i(method_data()));
2333   }
2334   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
2335   if (checked_exceptions_length() > 0) {
2336     CheckedExceptionElement* table = checked_exceptions_start();
2337     st->print_cr(" - checked ex start:  " PTR_FORMAT, p2i(table));
2338     if (Verbose) {
2339       for (int i = 0; i < checked_exceptions_length(); i++) {
2340         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2341       }
2342     }
2343   }
2344   if (has_linenumber_table()) {
2345     u_char* table = compressed_linenumber_table();

2375     st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2376   }
2377 }
2378 
2379 void Method::print_linkage_flags(outputStream* st) {
2380   access_flags().print_on(st);
2381   if (is_default_method()) {
2382     st->print("default ");
2383   }
2384   if (is_overpass()) {
2385     st->print("overpass ");
2386   }
2387 }
2388 #endif //PRODUCT
2389 
2390 void Method::print_value_on(outputStream* st) const {
2391   assert(is_method(), "must be method");
2392   st->print("%s", internal_name());
2393   print_address_on(st);
2394   st->print(" ");

2395   name()->print_value_on(st);
2396   st->print(" ");
2397   signature()->print_value_on(st);
2398   st->print(" in ");
2399   method_holder()->print_value_on(st);
2400   if (WizardMode) st->print("#%d", _vtable_index);
2401   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2402   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2403 }
2404 
2405 // Verification
2406 
2407 void Method::verify_on(outputStream* st) {
2408   guarantee(is_method(), "object must be method");
2409   guarantee(constants()->is_constantPool(), "should be constant pool");
2410   MethodData* md = method_data();
2411   guarantee(md == NULL ||
2412       md->is_methodData(), "should be method data");
2413 }

  40 #include "interpreter/interpreter.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "logging/log.hpp"
  43 #include "logging/logTag.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.inline.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/metaspaceClosure.hpp"
  48 #include "memory/oopFactory.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "memory/universe.hpp"
  51 #include "oops/constMethod.hpp"
  52 #include "oops/constantPool.hpp"
  53 #include "oops/klass.inline.hpp"
  54 #include "oops/method.inline.hpp"
  55 #include "oops/methodData.hpp"
  56 #include "oops/objArrayKlass.hpp"
  57 #include "oops/objArrayOop.inline.hpp"
  58 #include "oops/oop.inline.hpp"
  59 #include "oops/symbol.hpp"
  60 #include "oops/inlineKlass.inline.hpp"
  61 #include "prims/jvmtiExport.hpp"
  62 #include "prims/methodHandles.hpp"
  63 #include "runtime/arguments.hpp"
  64 #include "runtime/atomic.hpp"
  65 #include "runtime/continuationEntry.hpp"
  66 #include "runtime/frame.inline.hpp"
  67 #include "runtime/handles.inline.hpp"
  68 #include "runtime/init.hpp"
  69 #include "runtime/orderAccess.hpp"
  70 #include "runtime/relocator.hpp"
  71 #include "runtime/safepointVerifiers.hpp"
  72 #include "runtime/sharedRuntime.hpp"
  73 #include "runtime/signature.hpp"
  74 #include "runtime/vm_version.hpp"
  75 #include "services/memTracker.hpp"
  76 #include "utilities/align.hpp"
  77 #include "utilities/quickSort.hpp"
  78 #include "utilities/vmError.hpp"
  79 #include "utilities/xmlstream.hpp"
  80 

 104   set_access_flags(access_flags);
 105   set_intrinsic_id(vmIntrinsics::_none);
 106   set_force_inline(false);
 107   set_hidden(false);
 108   set_dont_inline(false);
 109   set_changes_current_thread(false);
 110   set_has_injected_profile(false);
 111   set_method_data(NULL);
 112   clear_method_counters();
 113   set_vtable_index(Method::garbage_vtable_index);
 114 
 115   // Fix and bury in Method*
 116   set_interpreter_entry(NULL); // sets i2i entry and from_int
 117   set_adapter_entry(NULL);
 118   Method::clear_code(); // from_c/from_i get set to c2i/i2i
 119 
 120   if (access_flags.is_native()) {
 121     clear_native_function();
 122     set_signature_handler(NULL);
 123   }

 124   NOT_PRODUCT(set_compiled_invocation_count(0);)
 125   // Name is very useful for debugging.
 126   NOT_PRODUCT(_name = name;)
 127 }
 128 
 129 // Release Method*.  The nmethod will be gone when we get here because
 130 // we've walked the code cache.
 131 void Method::deallocate_contents(ClassLoaderData* loader_data) {
 132   MetadataFactory::free_metadata(loader_data, constMethod());
 133   set_constMethod(NULL);
 134   MetadataFactory::free_metadata(loader_data, method_data());
 135   set_method_data(NULL);
 136   MetadataFactory::free_metadata(loader_data, method_counters());
 137   clear_method_counters();
 138   // The nmethod will be gone when we get here.
 139   if (code() != NULL) _code = NULL;
 140 }
 141 
 142 void Method::release_C_heap_structures() {
 143   if (method_data()) {
 144     method_data()->release_C_heap_structures();
 145 
 146     // Destroy MethodData embedded lock
 147     method_data()->~MethodData();
 148   }
 149 }
 150 
 151 address Method::get_i2c_entry() {
 152   assert(adapter() != NULL, "must have");
 153   return adapter()->get_i2c_entry();
 154 }
 155 
 156 address Method::get_c2i_entry() {
 157   assert(adapter() != NULL, "must have");
 158   return adapter()->get_c2i_entry();
 159 }
 160 
 161 address Method::get_c2i_inline_entry() {
 162   assert(adapter() != NULL, "must have");
 163   return adapter()->get_c2i_inline_entry();
 164 }
 165 
 166 address Method::get_c2i_unverified_entry() {
 167   assert(adapter() != NULL, "must have");
 168   return adapter()->get_c2i_unverified_entry();
 169 }
 170 
 171 address Method::get_c2i_unverified_inline_entry() {
 172   assert(adapter() != NULL, "must have");
 173   return adapter()->get_c2i_unverified_inline_entry();
 174 }
 175 
 176 address Method::get_c2i_no_clinit_check_entry() {
 177   assert(VM_Version::supports_fast_class_init_checks(), "");
 178   assert(adapter() != NULL, "must have");
 179   return adapter()->get_c2i_no_clinit_check_entry();
 180 }
 181 
 182 char* Method::name_and_sig_as_C_string() const {
 183   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
 184 }
 185 
 186 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
 187   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
 188 }
 189 
 190 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
 191   const char* klass_name = klass->external_name();
 192   int klass_name_len  = (int)strlen(klass_name);
 193   int method_name_len = method_name->utf8_length();
 194   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();
 195   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);

 662 }
 663 
 664 int Method::extra_stack_words() {
 665   // not an inline function, to avoid a header dependency on Interpreter
 666   return extra_stack_entries() * Interpreter::stackElementSize;
 667 }
 668 
 669 // Derive size of parameters, return type, and fingerprint,
 670 // all in one pass, which is run at load time.
 671 // We need the first two, and might as well grab the third.
 672 void Method::compute_from_signature(Symbol* sig) {
 673   // At this point, since we are scanning the signature,
 674   // we might as well compute the whole fingerprint.
 675   Fingerprinter fp(sig, is_static());
 676   set_size_of_parameters(fp.size_of_parameters());
 677   set_num_stack_arg_slots(fp.num_stack_arg_slots());
 678   constMethod()->set_result_type(fp.return_type());
 679   constMethod()->set_fingerprint(fp.fingerprint());
 680 }
 681 
 682 // InlineKlass the method is declared to return. This must not
 683 // safepoint as it is called with references live on the stack at
 684 // locations the GC is unaware of.
 685 InlineKlass* Method::returns_inline_type(Thread* thread) const {
 686   assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
 687   NoSafepointVerifier nsv;
 688   SignatureStream ss(signature());
 689   while (!ss.at_return_type()) {
 690     ss.next();
 691   }
 692   return ss.as_inline_klass(method_holder());
 693 }
 694 
 695 bool Method::is_vanilla_constructor() const {
 696   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
 697   // which only calls the superclass vanilla constructor and possibly does stores of
 698   // zero constants to local fields:
 699   //
 700   //   aload_0, _fast_aload_0, or _nofast_aload_0
 701   //   invokespecial
 702   //   indexbyte1
 703   //   indexbyte2
 704   //
 705   // followed by an (optional) sequence of:
 706   //
 707   //   aload_0
 708   //   aconst_null / iconst_0 / fconst_0 / dconst_0
 709   //   putfield
 710   //   indexbyte1
 711   //   indexbyte2
 712   //
 713   // followed by:
 714   //
 715   //   return
 716 
 717   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
 718   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
 719   int size = code_size();
 720   // Check if size match
 721   if (size == 0 || size % 5 != 0) return false;
 722   address cb = code_base();
 723   int last = size - 1;
 724   if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) ||
 725        cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
 726     // Does not call superclass default constructor
 727     return false;
 728   }
 729   // Check optional sequence
 730   for (int i = 4; i < last; i += 5) {
 731     if (cb[i] != Bytecodes::_aload_0) return false;
 732     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
 733     if (cb[i+2] != Bytecodes::_putfield) return false;
 734   }
 735   return true;
 736 }
 737 
 738 
 739 bool Method::compute_has_loops_flag() {
 740   BytecodeStream bcs(methodHandle(Thread::current(), this));
 741   Bytecodes::Code bc;
 742 
 743   while ((bc = bcs.next()) >= 0) {
 744     switch (bc) {
 745       case Bytecodes::_ifeq:

 863 
 864 bool Method::is_accessor() const {
 865   return is_getter() || is_setter();
 866 }
 867 
 868 bool Method::is_getter() const {
 869   if (code_size() != 5) return false;
 870   if (size_of_parameters() != 1) return false;
 871   if (java_code_at(0) != Bytecodes::_aload_0)  return false;
 872   if (java_code_at(1) != Bytecodes::_getfield) return false;
 873   switch (java_code_at(4)) {
 874     case Bytecodes::_ireturn:
 875     case Bytecodes::_lreturn:
 876     case Bytecodes::_freturn:
 877     case Bytecodes::_dreturn:
 878     case Bytecodes::_areturn:
 879       break;
 880     default:
 881       return false;
 882   }
 883   if (has_scalarized_return()) {
 884     // Don't treat this as (trivial) getter method because the
 885     // inline type should be returned in a scalarized form.
 886     return false;
 887   }
 888   return true;
 889 }
 890 
 891 bool Method::is_setter() const {
 892   if (code_size() != 6) return false;
 893   if (java_code_at(0) != Bytecodes::_aload_0) return false;
 894   switch (java_code_at(1)) {
 895     case Bytecodes::_iload_1:
 896     case Bytecodes::_aload_1:
 897     case Bytecodes::_fload_1:
 898       if (size_of_parameters() != 2) return false;
 899       break;
 900     case Bytecodes::_dload_1:
 901     case Bytecodes::_lload_1:
 902       if (size_of_parameters() != 3) return false;
 903       break;
 904     default:
 905       return false;
 906   }
 907   if (java_code_at(2) != Bytecodes::_putfield) return false;
 908   if (java_code_at(5) != Bytecodes::_return)   return false;
 909   if (has_scalarized_args()) {
 910     // Don't treat this as (trivial) setter method because the
 911     // inline type argument should be passed in a scalarized form.
 912     return false;
 913   }
 914   return true;
 915 }
 916 
 917 bool Method::is_constant_getter() const {
 918   int last_index = code_size() - 1;
 919   // Check if the first 1-3 bytecodes are a constant push
 920   // and the last bytecode is a return.
 921   return (2 <= code_size() && code_size() <= 4 &&
 922           Bytecodes::is_const(java_code_at(0)) &&
 923           Bytecodes::length_for(java_code_at(0)) == last_index &&
 924           Bytecodes::is_return(java_code_at(last_index)) &&
 925           !has_scalarized_args());
 926 }
 927 
 928 bool Method::is_object_constructor_or_class_initializer() const {
 929   return (is_object_constructor() || is_class_initializer());
 930 }
 931 
 932 bool Method::is_class_initializer() const {





 933   // For classfiles version 51 or greater, ensure that the clinit method is
 934   // static.  Non-static methods with the name "<clinit>" are not static
 935   // initializers. (older classfiles exempted for backward compatibility)
 936   return (name() == vmSymbols::class_initializer_name() &&
 937           (is_static() ||
 938            method_holder()->major_version() < 51));
 939 }
 940 
 941 // A method named <init>, is a classic object constructor.
 942 bool Method::is_object_constructor() const {
 943   return name() == vmSymbols::object_initializer_name();
 944 }
 945 
 946 // A method named <vnew> is a factory for an inline class.
 947 bool Method::is_static_vnew_factory() const {
 948   return name() == vmSymbols::inline_factory_name();
 949 }
 950 
 951 bool Method::needs_clinit_barrier() const {
 952   return is_static() && !method_holder()->is_initialized();
 953 }
 954 
 955 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) {
 956   int length = method->checked_exceptions_length();
 957   if (length == 0) {  // common case
 958     return objArrayHandle(THREAD, Universe::the_empty_class_array());
 959   } else {
 960     methodHandle h_this(THREAD, method);
 961     objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle()));
 962     objArrayHandle mirrors (THREAD, m_oop);
 963     for (int i = 0; i < length; i++) {
 964       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
 965       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
 966       if (log_is_enabled(Warning, exceptions) &&
 967           !k->is_subclass_of(vmClasses::Throwable_klass())) {
 968         ResourceMark rm(THREAD);

 986     // Not necessarily sorted and not necessarily one-to-one.
 987     CompressedLineNumberReadStream stream(compressed_linenumber_table());
 988     while (stream.read_pair()) {
 989       if (stream.bci() == bci) {
 990         // perfect match
 991         return stream.line();
 992       } else {
 993         // update best_bci/line
 994         if (stream.bci() < bci && stream.bci() >= best_bci) {
 995           best_bci  = stream.bci();
 996           best_line = stream.line();
 997         }
 998       }
 999     }
1000   }
1001   return best_line;
1002 }
1003 
1004 
1005 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
1006   if( constants()->tag_at(klass_index).is_unresolved_klass()) {
1007     Thread *thread = Thread::current();
1008     Symbol* klass_name = constants()->klass_name_at(klass_index);
1009     Handle loader(thread, method_holder()->class_loader());
1010     Handle prot  (thread, method_holder()->protection_domain());
1011     return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != NULL;
1012   } else {
1013     return true;
1014   }
1015 }
1016 
1017 
1018 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1019   int klass_index = constants()->klass_ref_index_at(refinfo_index);
1020   if (must_be_resolved) {
1021     // Make sure klass is resolved in constantpool.
1022     if (constants()->tag_at(klass_index).is_unresolved_klass()) {
1023       return false;
1024     }
1025   }
1026   return is_klass_loaded_by_klass_index(klass_index);
1027 }
1028 
1029 
1030 void Method::set_native_function(address function, bool post_event_flag) {
1031   assert(function != NULL, "use clear_native_function to unregister natives");
1032   assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
1033   address* native_function = native_function_addr();
1034 
1035   // We can see racers trying to place the same native function into place. Once
1036   // is plenty.
1037   address current = *native_function;
1038   if (current == function) return;
1039   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
1040       function != NULL) {
1041     // native_method_throw_unsatisfied_link_error_entry() should only
1042     // be passed when post_event_flag is false.
1043     assert(function !=
1044       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),

1173 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) {
1174   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
1175   if (comp_level == CompLevel_all) {
1176     set_not_c1_osr_compilable();
1177     set_not_c2_osr_compilable();
1178   } else {
1179     if (is_c1_compile(comp_level))
1180       set_not_c1_osr_compilable();
1181     if (is_c2_compile(comp_level))
1182       set_not_c2_osr_compilable();
1183   }
1184   assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check");
1185 }
1186 
1187 // Revert to using the interpreter and clear out the nmethod
1188 void Method::clear_code() {
1189   // this may be NULL if c2i adapters have not been made yet
1190   // Only should happen at allocate time.
1191   if (adapter() == NULL) {
1192     _from_compiled_entry    = NULL;
1193     _from_compiled_inline_entry = NULL;
1194     _from_compiled_inline_ro_entry = NULL;
1195   } else {
1196     _from_compiled_entry    = adapter()->get_c2i_entry();
1197     _from_compiled_inline_entry = adapter()->get_c2i_inline_entry();
1198     _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry();
1199   }
1200   OrderAccess::storestore();
1201   _from_interpreted_entry = _i2i_entry;
1202   OrderAccess::storestore();
1203   _code = NULL;
1204 }
1205 
1206 void Method::unlink_code(CompiledMethod *compare) {
1207   MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1208   // We need to check if either the _code or _from_compiled_code_entry_point
1209   // refer to this nmethod because there is a race in setting these two fields
1210   // in Method* as seen in bugid 4947125.
1211   if (code() == compare ||
1212       from_compiled_entry() == compare->verified_entry_point()) {
1213     clear_code();
1214   }
1215 }
1216 
1217 void Method::unlink_code() {
1218   MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1219   clear_code();
1220 }
1221 
1222 #if INCLUDE_CDS
1223 // Called by class data sharing to remove any entry points (which are not shared)
1224 void Method::unlink_method() {
1225   Arguments::assert_is_dumping_archive();
1226   _code = NULL;
1227   _adapter = NULL;
1228   _i2i_entry = NULL;
1229   _from_compiled_entry = NULL;
1230   _from_compiled_inline_entry = NULL;
1231   _from_compiled_inline_ro_entry = NULL;
1232   _from_interpreted_entry = NULL;
1233 
1234   if (is_native()) {
1235     *native_function_addr() = NULL;
1236     set_signature_handler(NULL);
1237   }
1238   NOT_PRODUCT(set_compiled_invocation_count(0);)
1239 
1240   set_method_data(NULL);
1241   clear_method_counters();
1242 }
1243 #endif
1244 
1245 // Called when the method_holder is getting linked. Setup entrypoints so the method
1246 // is ready to be called from interpreter, compiler, and vtables.
1247 void Method::link_method(const methodHandle& h_method, TRAPS) {
1248   // If the code cache is full, we may reenter this function for the
1249   // leftover methods that weren't linked.
1250   if (adapter() != NULL) {
1251     return;
1252   }
1253   assert( _code == NULL, "nothing compiled yet" );
1254 
1255   // Setup interpreter entrypoint
1256   assert(this == h_method(), "wrong h_method()" );
1257 
1258   assert(adapter() == NULL, "init'd to NULL");
1259   address entry = Interpreter::entry_for_method(h_method);
1260   assert(entry != NULL, "interpreter entry must be non-null");
1261   // Sets both _i2i_entry and _from_interpreted_entry
1262   set_interpreter_entry(entry);
1263 
1264   // Don't overwrite already registered native entries.
1265   if (is_native() && !has_native_function()) {
1266     set_native_function(
1267       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
1268       !native_bind_event_is_interesting);
1269   }
1270   if (InlineTypeReturnedAsFields && returns_inline_type(THREAD)) {
1271     set_has_scalarized_return(true);
1272   }
1273 
1274   // Setup compiler entrypoint.  This is made eagerly, so we do not need
1275   // special handling of vtables.  An alternative is to make adapters more
1276   // lazily by calling make_adapter() from from_compiled_entry() for the
1277   // normal calls.  For vtable calls life gets more complicated.  When a
1278   // call-site goes mega-morphic we need adapters in all methods which can be
1279   // called from the vtable.  We need adapters on such methods that get loaded
1280   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
1281   // problem we'll make these lazily later.
1282   (void) make_adapters(h_method, CHECK);
1283 
1284   // ONLY USE the h_method now as make_adapter may have blocked
1285 
1286   if (h_method->is_continuation_native_intrinsic()) {
1287     // the entry points to this method will be set in set_code, called when first resolving this method
1288     _from_interpreted_entry = NULL;
1289     _from_compiled_entry = NULL;
1290     _i2i_entry = NULL;
1291   }
1292 }
1293 
1294 address Method::make_adapters(const methodHandle& mh, TRAPS) {
1295   // Adapters for compiled code are made eagerly here.  They are fairly
1296   // small (generally < 100 bytes) and quick to make (and cached and shared)
1297   // so making them eagerly shouldn't be too expensive.
1298   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
1299   if (adapter == NULL ) {
1300     if (!is_init_completed()) {
1301       // Don't throw exceptions during VM initialization because java.lang.* classes
1302       // might not have been initialized, causing problems when constructing the
1303       // Java exception object.
1304       vm_exit_during_initialization("Out of space in CodeCache for adapters");
1305     } else {
1306       THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters");
1307     }
1308   }
1309 
1310   mh->set_adapter_entry(adapter);
1311   mh->_from_compiled_entry = adapter->get_c2i_entry();
1312   mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry();
1313   mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry();
1314   return adapter->get_c2i_entry();
1315 }
1316 
1317 // The verified_code_entry() must be called when a invoke is resolved
1318 // on this method.
1319 
1320 // It returns the compiled code entry point, after asserting not null.
1321 // This function is called after potential safepoints so that nmethod
1322 // or adapter that it points to is still live and valid.
1323 // This function must not hit a safepoint!
1324 address Method::verified_code_entry() {
1325   debug_only(NoSafepointVerifier nsv;)
1326   assert(_from_compiled_entry != NULL, "must be set");
1327   return _from_compiled_entry;
1328 }
1329 
1330 address Method::verified_inline_code_entry() {
1331   debug_only(NoSafepointVerifier nsv;)
1332   assert(_from_compiled_inline_entry != NULL, "must be set");
1333   return _from_compiled_inline_entry;
1334 }
1335 
1336 address Method::verified_inline_ro_code_entry() {
1337   debug_only(NoSafepointVerifier nsv;)
1338   assert(_from_compiled_inline_ro_entry != NULL, "must be set");
1339   return _from_compiled_inline_ro_entry;
1340 }
1341 
1342 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
1343 // (could be racing a deopt).
1344 // Not inline to avoid circular ref.
1345 bool Method::check_code() const {
1346   // cached in a register or local.  There's a race on the value of the field.
1347   CompiledMethod *code = Atomic::load_acquire(&_code);
1348   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
1349 }
1350 
1351 // Install compiled code.  Instantly it can execute.
1352 void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
1353   assert_lock_strong(CompiledMethod_lock);
1354   assert( code, "use clear_code to remove code" );
1355   assert( mh->check_code(), "" );
1356 
1357   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
1358 
1359   // These writes must happen in this order, because the interpreter will
1360   // directly jump to from_interpreted_entry which jumps to an i2c adapter
1361   // which jumps to _from_compiled_entry.
1362   mh->_code = code;             // Assign before allowing compiled code to exec
1363 
1364   int comp_level = code->comp_level();
1365   // In theory there could be a race here. In practice it is unlikely
1366   // and not worth worrying about.
1367   if (comp_level > mh->highest_comp_level()) {
1368     mh->set_highest_comp_level(comp_level);
1369   }
1370 
1371   OrderAccess::storestore();
1372   mh->_from_compiled_entry = code->verified_entry_point();
1373   mh->_from_compiled_inline_entry = code->verified_inline_entry_point();
1374   mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point();
1375   OrderAccess::storestore();
1376 
1377   if (mh->is_continuation_native_intrinsic()) {
1378     assert(mh->_from_interpreted_entry == NULL, "initialized incorrectly"); // see link_method
1379 
1380     if (mh->is_continuation_enter_intrinsic()) {
1381       // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted
1382       mh->_i2i_entry = ContinuationEntry::interpreted_entry();
1383     } else if (mh->is_continuation_yield_intrinsic()) {
1384       mh->_i2i_entry = mh->get_i2c_entry();
1385     } else {
1386       guarantee(false, "Unknown Continuation native intrinsic");
1387     }
1388     // This must come last, as it is what's tested in LinkResolver::resolve_static_call
1389     Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry());
1390   } else if (!mh->is_method_handle_intrinsic()) {
1391     // Instantly compiled code can execute.
1392     mh->_from_interpreted_entry = mh->get_i2c_entry();
1393   }
1394 }

2331 }
2332 
2333 // Check that this pointer is valid by checking that the vtbl pointer matches
2334 bool Method::is_valid_method(const Method* m) {
2335   if (m == NULL) {
2336     return false;
2337   } else if ((intptr_t(m) & (wordSize-1)) != 0) {
2338     // Quick sanity check on pointer.
2339     return false;
2340   } else if (!os::is_readable_range(m, m + 1)) {
2341     return false;
2342   } else if (m->is_shared()) {
2343     return CppVtables::is_valid_shared_method(m);
2344   } else if (Metaspace::contains_non_shared(m)) {
2345     return has_method_vptr((const void*)m);
2346   } else {
2347     return false;
2348   }
2349 }
2350 
2351 bool Method::is_scalarized_arg(int idx) const {
2352   if (!has_scalarized_args()) {
2353     return false;
2354   }
2355   // Search through signature and check if argument is wrapped in T_PRIMITIVE_OBJECT/T_VOID
2356   int depth = 0;
2357   const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc();
2358   for (int i = 0; i < sig->length(); i++) {
2359     BasicType bt = sig->at(i)._bt;
2360     if (bt == T_PRIMITIVE_OBJECT) {
2361       depth++;
2362     }
2363     if (idx == 0) {
2364       break; // Argument found
2365     }
2366     if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) {
2367       depth--;
2368     }
2369     if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) {
2370       idx--; // Advance to next argument
2371     }
2372   }
2373   return depth != 0;
2374 }
2375 
2376 #ifndef PRODUCT
2377 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) {
2378   out->print("%d", loader_data->jmethod_ids()->count_methods());
2379 }
2380 #endif // PRODUCT
2381 
2382 
2383 // Printing
2384 
2385 #ifndef PRODUCT
2386 
2387 void Method::print_on(outputStream* st) const {
2388   ResourceMark rm;
2389   assert(is_method(), "must be method");
2390   st->print_cr("%s", internal_name());
2391   st->print_cr(" - this oop:          " PTR_FORMAT, p2i(this));
2392   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
2393   st->print   (" - constants:         " PTR_FORMAT " ", p2i(constants()));
2394   constants()->print_value_on(st); st->cr();
2395   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
2396   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
2397   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
2398   st->print_cr(" - max stack:         %d",   max_stack());
2399   st->print_cr(" - max locals:        %d",   max_locals());
2400   st->print_cr(" - size of params:    %d",   size_of_parameters());
2401   st->print_cr(" - method size:       %d",   method_size());
2402   if (intrinsic_id() != vmIntrinsics::_none)
2403     st->print_cr(" - intrinsic id:      %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id()));
2404   if (highest_comp_level() != CompLevel_none)
2405     st->print_cr(" - highest level:     %d", highest_comp_level());
2406   st->print_cr(" - vtable index:      %d",   _vtable_index);
2407 #ifdef ASSERT
2408   if (valid_itable_index())
2409     st->print_cr(" - itable index:      %d",   itable_index());
2410 #endif
2411   st->print_cr(" - i2i entry:         " PTR_FORMAT, p2i(interpreter_entry()));
2412   st->print(   " - adapters:          ");
2413   AdapterHandlerEntry* a = ((Method*)this)->adapter();
2414   if (a == NULL)
2415     st->print_cr(PTR_FORMAT, p2i(a));
2416   else
2417     a->print_adapter_on(st);
2418   st->print_cr(" - compiled entry           " PTR_FORMAT, p2i(from_compiled_entry()));
2419   st->print_cr(" - compiled inline entry    " PTR_FORMAT, p2i(from_compiled_inline_entry()));
2420   st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry()));
2421   st->print_cr(" - code size:         %d",   code_size());
2422   if (code_size() != 0) {
2423     st->print_cr(" - code start:        " PTR_FORMAT, p2i(code_base()));
2424     st->print_cr(" - code end (excl):   " PTR_FORMAT, p2i(code_base() + code_size()));
2425   }
2426   if (method_data() != NULL) {
2427     st->print_cr(" - method data:       " PTR_FORMAT, p2i(method_data()));
2428   }
2429   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
2430   if (checked_exceptions_length() > 0) {
2431     CheckedExceptionElement* table = checked_exceptions_start();
2432     st->print_cr(" - checked ex start:  " PTR_FORMAT, p2i(table));
2433     if (Verbose) {
2434       for (int i = 0; i < checked_exceptions_length(); i++) {
2435         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
2436       }
2437     }
2438   }
2439   if (has_linenumber_table()) {
2440     u_char* table = compressed_linenumber_table();

2470     st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler()));
2471   }
2472 }
2473 
2474 void Method::print_linkage_flags(outputStream* st) {
2475   access_flags().print_on(st);
2476   if (is_default_method()) {
2477     st->print("default ");
2478   }
2479   if (is_overpass()) {
2480     st->print("overpass ");
2481   }
2482 }
2483 #endif //PRODUCT
2484 
2485 void Method::print_value_on(outputStream* st) const {
2486   assert(is_method(), "must be method");
2487   st->print("%s", internal_name());
2488   print_address_on(st);
2489   st->print(" ");
2490   if (WizardMode) access_flags().print_on(st);
2491   name()->print_value_on(st);
2492   st->print(" ");
2493   signature()->print_value_on(st);
2494   st->print(" in ");
2495   method_holder()->print_value_on(st);
2496   if (WizardMode) st->print("#%d", _vtable_index);
2497   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
2498   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
2499 }
2500 
2501 // Verification
2502 
2503 void Method::verify_on(outputStream* st) {
2504   guarantee(is_method(), "object must be method");
2505   guarantee(constants()->is_constantPool(), "should be constant pool");
2506   MethodData* md = method_data();
2507   guarantee(md == NULL ||
2508       md->is_methodData(), "should be method data");
2509 }
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