jdk8-mips64-public/hotspot: src/share/vm/oops/method.cpp@5832cdaf89c6 (annotated)

src/share/vm/oops/method.cpp@5832cdaf89c6 (annotated)

src/share/vm/oops/method.cpp

Mon, 16 Dec 2013 08:24:33 -0500

author: hseigel
date: Mon, 16 Dec 2013 08:24:33 -0500
changeset 6195: 5832cdaf89c6
parent 6039: bd3237e0e18d
child 6429: 606acabe7b5c
permissions: -rw-r--r--

8027804: JCK resolveMethod test fails expecting AbstractMethodError
Summary: Create AME overpass methods and fix method search logic
Reviewed-by: kamg, acorn, lfoltan, coleenp

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/metadataOnStackMark.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/debugInfoRec.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/bytecodeTracer.hpp"
 #include "interpreter/bytecodes.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/generation.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/metadataFactory.hpp"
 #include "memory/oopFactory.hpp"
 #include "oops/constMethod.hpp"
 #include "oops/methodData.hpp"
 #include "oops/method.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/symbol.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/methodHandles.hpp"
 #include "prims/nativeLookup.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/relocator.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/signature.hpp"
 #include "utilities/quickSort.hpp"
 #include "utilities/xmlstream.hpp"
 // Implementation of Method
 Method* Method::allocate(ClassLoaderData* loader_data,
                          int byte_code_size,
                          AccessFlags access_flags,
                          InlineTableSizes* sizes,
                          ConstMethod::MethodType method_type,
                          TRAPS) {
   assert(!access_flags.is_native() || byte_code_size == 0,
          "native methods should not contain byte codes");
   ConstMethod* cm = ConstMethod::allocate(loader_data,
                                           byte_code_size,
                                           sizes,
                                           method_type,
                                           CHECK_NULL);
   int size = Method::size(access_flags.is_native());
   return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size);
 }
 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
   No_Safepoint_Verifier no_safepoint;
   set_constMethod(xconst);
   set_access_flags(access_flags);
   set_method_size(size);
 #ifdef CC_INTERP
   set_result_index(T_VOID);
 #endif
   set_intrinsic_id(vmIntrinsics::_none);
   set_jfr_towrite(false);
   set_force_inline(false);
   set_hidden(false);
   set_dont_inline(false);
   set_method_data(NULL);
   set_method_counters(NULL);
   set_vtable_index(Method::garbage_vtable_index);
   // Fix and bury in Method*
   set_interpreter_entry(NULL); // sets i2i entry and from_int
   set_adapter_entry(NULL);
   clear_code(); // from_c/from_i get set to c2i/i2i
   if (access_flags.is_native()) {
     clear_native_function();
     set_signature_handler(NULL);
   }
   NOT_PRODUCT(set_compiled_invocation_count(0);)
 }
 // Release Method*.  The nmethod will be gone when we get here because
 // we've walked the code cache.
 void Method::deallocate_contents(ClassLoaderData* loader_data) {
   MetadataFactory::free_metadata(loader_data, constMethod());
   set_constMethod(NULL);
   MetadataFactory::free_metadata(loader_data, method_data());
   set_method_data(NULL);
   MetadataFactory::free_metadata(loader_data, method_counters());
   set_method_counters(NULL);
   // The nmethod will be gone when we get here.
   if (code() != NULL) _code = NULL;
 }
 address Method::get_i2c_entry() {
   assert(_adapter != NULL, "must have");
   return _adapter->get_i2c_entry();
 }
 address Method::get_c2i_entry() {
   assert(_adapter != NULL, "must have");
   return _adapter->get_c2i_entry();
 }
 address Method::get_c2i_unverified_entry() {
   assert(_adapter != NULL, "must have");
   return _adapter->get_c2i_unverified_entry();
 }
 char* Method::name_and_sig_as_C_string() const {
   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature());
 }
 char* Method::name_and_sig_as_C_string(char* buf, int size) const {
   return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size);
 }
 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) {
   const char* klass_name = klass->external_name();
   int klass_name_len  = (int)strlen(klass_name);
   int method_name_len = method_name->utf8_length();
   int len             = klass_name_len + 1 + method_name_len + signature->utf8_length();
   char* dest          = NEW_RESOURCE_ARRAY(char, len + 1);
   strcpy(dest, klass_name);
   dest[klass_name_len] = '.';
   strcpy(&dest[klass_name_len + 1], method_name->as_C_string());
   strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string());
   dest[len] = 0;
   return dest;
 }
 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) {
   Symbol* klass_name = klass->name();
   klass_name->as_klass_external_name(buf, size);
   int len = (int)strlen(buf);
   if (len < size - 1) {
     buf[len++] = '.';
     method_name->as_C_string(&(buf[len]), size - len);
     len = (int)strlen(buf);
     signature->as_C_string(&(buf[len]), size - len);
   }
   return buf;
 }
 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) {
   // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index)
   // access exception table
   ExceptionTable table(mh());
   int length = table.length();
   // iterate through all entries sequentially
   constantPoolHandle pool(THREAD, mh->constants());
   for (int i = 0; i < length; i ++) {
     //reacquire the table in case a GC happened
     ExceptionTable table(mh());
     int beg_bci = table.start_pc(i);
     int end_bci = table.end_pc(i);
     assert(beg_bci <= end_bci, "inconsistent exception table");
     if (beg_bci <= throw_bci && throw_bci < end_bci) {
       // exception handler bci range covers throw_bci => investigate further
       int handler_bci = table.handler_pc(i);
       int klass_index = table.catch_type_index(i);
       if (klass_index == 0) {
         return handler_bci;
       } else if (ex_klass.is_null()) {
         return handler_bci;
       } else {
         // we know the exception class => get the constraint class
         // this may require loading of the constraint class; if verification
         // fails or some other exception occurs, return handler_bci
         Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci));
         KlassHandle klass = KlassHandle(THREAD, k);
         assert(klass.not_null(), "klass not loaded");
         if (ex_klass->is_subtype_of(klass())) {
           return handler_bci;
         }
       }
     }
   }
   return -1;
 }
 void Method::mask_for(int bci, InterpreterOopMap* mask) {
   Thread* myThread    = Thread::current();
   methodHandle h_this(myThread, this);
 #ifdef ASSERT
   bool has_capability = myThread->is_VM_thread() ||
                         myThread->is_ConcurrentGC_thread() ||
                         myThread->is_GC_task_thread();
   if (!has_capability) {
     if (!VerifyStack && !VerifyLastFrame) {
       // verify stack calls this outside VM thread
       warning("oopmap should only be accessed by the "
               "VM, GC task or CMS threads (or during debugging)");
       InterpreterOopMap local_mask;
       method_holder()->mask_for(h_this, bci, &local_mask);
       local_mask.print();
     }
   }
 #endif
   method_holder()->mask_for(h_this, bci, mask);
   return;
 }
 int Method::bci_from(address bcp) const {
 #ifdef ASSERT
   { ResourceMark rm;
   assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(),
          err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string()));
   }
 #endif
   return bcp - code_base();
 }
 // Return (int)bcx if it appears to be a valid BCI.
 // Return bci_from((address)bcx) if it appears to be a valid BCP.
 // Return -1 otherwise.
 // Used by profiling code, when invalid data is a possibility.
 // The caller is responsible for validating the Method* itself.
 int Method::validate_bci_from_bcx(intptr_t bcx) const {
   // keep bci as -1 if not a valid bci
   int bci = -1;
   if (bcx == 0 || (address)bcx == code_base()) {
     // code_size() may return 0 and we allow 0 here
     // the method may be native
     bci = 0;
   } else if (frame::is_bci(bcx)) {
     if (bcx < code_size()) {
       bci = (int)bcx;
     }
   } else if (contains((address)bcx)) {
     bci = (address)bcx - code_base();
   }
   // Assert that if we have dodged any asserts, bci is negative.
   assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0");
   return bci;
 }
 address Method::bcp_from(int bci) const {
   assert((is_native() && bci == 0)  || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci");
   address bcp = code_base() + bci;
   assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method");
   return bcp;
 }
 int Method::size(bool is_native) {
   // If native, then include pointers for native_function and signature_handler
   int extra_bytes = (is_native) ? 2*sizeof(address*) : 0;
   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
   return align_object_size(header_size() + extra_words);
 }
 Symbol* Method::klass_name() const {
   Klass* k = method_holder();
   assert(k->is_klass(), "must be klass");
   InstanceKlass* ik = (InstanceKlass*) k;
   return ik->name();
 }
 // Attempt to return method oop to original state.  Clear any pointers
 // (to objects outside the shared spaces).  We won't be able to predict
 // where they should point in a new JVM.  Further initialize some
 // entries now in order allow them to be write protected later.
 void Method::remove_unshareable_info() {
   unlink_method();
 }
 bool Method::was_executed_more_than(int n) {
   // Invocation counter is reset when the Method* is compiled.
   // If the method has compiled code we therefore assume it has
   // be excuted more than n times.
   if (is_accessor() || is_empty_method() || (code() != NULL)) {
     // interpreter doesn't bump invocation counter of trivial methods
     // compiler does not bump invocation counter of compiled methods
     return true;
   }
   else if ((method_counters() != NULL &&
             method_counters()->invocation_counter()->carry()) ||
            (method_data() != NULL &&
             method_data()->invocation_counter()->carry())) {
     // The carry bit is set when the counter overflows and causes
     // a compilation to occur.  We don't know how many times
     // the counter has been reset, so we simply assume it has
     // been executed more than n times.
     return true;
   } else {
     return invocation_count() > n;
   }
 }
 #ifndef PRODUCT
 void Method::print_invocation_count() {
   if (is_static()) tty->print("static ");
   if (is_final()) tty->print("final ");
   if (is_synchronized()) tty->print("synchronized ");
   if (is_native()) tty->print("native ");
   method_holder()->name()->print_symbol_on(tty);
   tty->print(".");
   name()->print_symbol_on(tty);
   signature()->print_symbol_on(tty);
   if (WizardMode) {
     // dump the size of the byte codes
     tty->print(" {%d}", code_size());
   }
   tty->cr();
   tty->print_cr ("  interpreter_invocation_count: %8d ", interpreter_invocation_count());
   tty->print_cr ("  invocation_counter:           %8d ", invocation_count());
   tty->print_cr ("  backedge_counter:             %8d ", backedge_count());
   if (CountCompiledCalls) {
     tty->print_cr ("  compiled_invocation_count: %8d ", compiled_invocation_count());
   }
 }
 #endif
 // Build a MethodData* object to hold information about this method
 // collected in the interpreter.
 void Method::build_interpreter_method_data(methodHandle method, TRAPS) {
   // Do not profile method if current thread holds the pending list lock,
   // which avoids deadlock for acquiring the MethodData_lock.
   if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {
     return;
   }
   // Grab a lock here to prevent multiple
   // MethodData*s from being created.
   MutexLocker ml(MethodData_lock, THREAD);
   if (method->method_data() == NULL) {
     ClassLoaderData* loader_data = method->method_holder()->class_loader_data();
     MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);
     method->set_method_data(method_data);
     if (PrintMethodData && (Verbose || WizardMode)) {
       ResourceMark rm(THREAD);
       tty->print("build_interpreter_method_data for ");
       method->print_name(tty);
       tty->cr();
       // At the end of the run, the MDO, full of data, will be dumped.
     }
   }
 }
 MethodCounters* Method::build_method_counters(Method* m, TRAPS) {
   methodHandle mh(m);
   ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
   MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
   if (mh->method_counters() == NULL) {
     mh->set_method_counters(counters);
   } else {
     MetadataFactory::free_metadata(loader_data, counters);
   }
   return mh->method_counters();
 }
 void Method::cleanup_inline_caches() {
   // The current system doesn't use inline caches in the interpreter
   // => nothing to do (keep this method around for future use)
 }
 int Method::extra_stack_words() {
   // not an inline function, to avoid a header dependency on Interpreter
   return extra_stack_entries() * Interpreter::stackElementSize;
 }
 void Method::compute_size_of_parameters(Thread *thread) {
   ArgumentSizeComputer asc(signature());
   set_size_of_parameters(asc.size() + (is_static() ? 0 : 1));
 }
 #ifdef CC_INTERP
 void Method::set_result_index(BasicType type)          {
   _result_index = Interpreter::BasicType_as_index(type);
 }
 #endif
 BasicType Method::result_type() const {
   ResultTypeFinder rtf(signature());
   return rtf.type();
 }
 bool Method::is_empty_method() const {
   return  code_size() == 1
       && *code_base() == Bytecodes::_return;
 }
 bool Method::is_vanilla_constructor() const {
   // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method
   // which only calls the superclass vanilla constructor and possibly does stores of
   // zero constants to local fields:
   //
   //   aload_0
   //   invokespecial
   //   indexbyte1
   //   indexbyte2
   //
   // followed by an (optional) sequence of:
   //
   //   aload_0
   //   aconst_null / iconst_0 / fconst_0 / dconst_0
   //   putfield
   //   indexbyte1
   //   indexbyte2
   //
   // followed by:
   //
   //   return
   assert(name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructors");
   assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors");
   int size = code_size();
   // Check if size match
   if (size == 0 || size % 5 != 0) return false;
   address cb = code_base();
   int last = size - 1;
   if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) {
     // Does not call superclass default constructor
     return false;
   }
   // Check optional sequence
   for (int i = 4; i < last; i += 5) {
     if (cb[i] != Bytecodes::_aload_0) return false;
     if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false;
     if (cb[i+2] != Bytecodes::_putfield) return false;
   }
   return true;
 }
 bool Method::compute_has_loops_flag() {
   BytecodeStream bcs(this);
   Bytecodes::Code bc;
   while ((bc = bcs.next()) >= 0) {
     switch( bc ) {
       case Bytecodes::_ifeq:
       case Bytecodes::_ifnull:
       case Bytecodes::_iflt:
       case Bytecodes::_ifle:
       case Bytecodes::_ifne:
       case Bytecodes::_ifnonnull:
       case Bytecodes::_ifgt:
       case Bytecodes::_ifge:
       case Bytecodes::_if_icmpeq:
       case Bytecodes::_if_icmpne:
       case Bytecodes::_if_icmplt:
       case Bytecodes::_if_icmpgt:
       case Bytecodes::_if_icmple:
       case Bytecodes::_if_icmpge:
       case Bytecodes::_if_acmpeq:
       case Bytecodes::_if_acmpne:
       case Bytecodes::_goto:
       case Bytecodes::_jsr:
         if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops();
         break;
       case Bytecodes::_goto_w:
       case Bytecodes::_jsr_w:
         if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops();
         break;
     }
   }
   _access_flags.set_loops_flag_init();
   return _access_flags.has_loops();
 }
 bool Method::is_final_method(AccessFlags class_access_flags) const {
   // or "does_not_require_vtable_entry"
   // default method or overpass can occur, is not final (reuses vtable entry)
   // private methods get vtable entries for backward class compatibility.
   if (is_overpass() || is_default_method())  return false;
   return is_final() || class_access_flags.is_final();
 }
 bool Method::is_final_method() const {
   return is_final_method(method_holder()->access_flags());
 }
 bool Method::is_default_method() const {
   if (method_holder() != NULL &&
       method_holder()->is_interface() &&
       !is_abstract()) {
     return true;
   } else {
     return false;
   }
 }
 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const {
   if (is_final_method(class_access_flags))  return true;
 #ifdef ASSERT
   ResourceMark rm;
   bool is_nonv = (vtable_index() == nonvirtual_vtable_index);
   if (class_access_flags.is_interface()) {
       assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string()));
   }
 #endif
   assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question");
   return vtable_index() == nonvirtual_vtable_index;
 }
 bool Method::can_be_statically_bound() const {
   return can_be_statically_bound(method_holder()->access_flags());
 }
 bool Method::is_accessor() const {
   if (code_size() != 5) return false;
   if (size_of_parameters() != 1) return false;
   if (java_code_at(0) != Bytecodes::_aload_0 ) return false;
   if (java_code_at(1) != Bytecodes::_getfield) return false;
   if (java_code_at(4) != Bytecodes::_areturn &&
       java_code_at(4) != Bytecodes::_ireturn ) return false;
   return true;
 }
 bool Method::is_initializer() const {
   return name() == vmSymbols::object_initializer_name() || is_static_initializer();
 }
 bool Method::has_valid_initializer_flags() const {
   return (is_static() ||
           method_holder()->major_version() < 51);
 }
 bool Method::is_static_initializer() const {
   // For classfiles version 51 or greater, ensure that the clinit method is
   // static.  Non-static methods with the name "<clinit>" are not static
   // initializers. (older classfiles exempted for backward compatibility)
   return name() == vmSymbols::class_initializer_name() &&
          has_valid_initializer_flags();
 }
 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) {
   int length = this_oop->checked_exceptions_length();
   if (length == 0) {  // common case
     return objArrayHandle(THREAD, Universe::the_empty_class_klass_array());
   } else {
     methodHandle h_this(THREAD, this_oop);
     objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle()));
     objArrayHandle mirrors (THREAD, m_oop);
     for (int i = 0; i < length; i++) {
       CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe
       Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle()));
       assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class");
       mirrors->obj_at_put(i, k->java_mirror());
     }
     return mirrors;
   }
 };
 int Method::line_number_from_bci(int bci) const {
   if (bci == SynchronizationEntryBCI) bci = 0;
   assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci");
   int best_bci  =  0;
   int best_line = -1;
   if (has_linenumber_table()) {
     // The line numbers are a short array of 2-tuples [start_pc, line_number].
     // Not necessarily sorted and not necessarily one-to-one.
     CompressedLineNumberReadStream stream(compressed_linenumber_table());
     while (stream.read_pair()) {
       if (stream.bci() == bci) {
         // perfect match
         return stream.line();
       } else {
         // update best_bci/line
         if (stream.bci() < bci && stream.bci() >= best_bci) {
           best_bci  = stream.bci();
           best_line = stream.line();
         }
       }
     }
   }
   return best_line;
 }
 bool Method::is_klass_loaded_by_klass_index(int klass_index) const {
   if( constants()->tag_at(klass_index).is_unresolved_klass() ) {
     Thread *thread = Thread::current();
     Symbol* klass_name = constants()->klass_name_at(klass_index);
     Handle loader(thread, method_holder()->class_loader());
     Handle prot  (thread, method_holder()->protection_domain());
     return SystemDictionary::find(klass_name, loader, prot, thread) != NULL;
   } else {
     return true;
   }
 }
 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
   int klass_index = constants()->klass_ref_index_at(refinfo_index);
   if (must_be_resolved) {
     // Make sure klass is resolved in constantpool.
     if (constants()->tag_at(klass_index).is_unresolved_klass()) return false;
   }
   return is_klass_loaded_by_klass_index(klass_index);
 }
 void Method::set_native_function(address function, bool post_event_flag) {
   assert(function != NULL, "use clear_native_function to unregister natives");
   assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), "");
   address* native_function = native_function_addr();
   // We can see racers trying to place the same native function into place. Once
   // is plenty.
   address current = *native_function;
   if (current == function) return;
   if (post_event_flag && JvmtiExport::should_post_native_method_bind() &&
       function != NULL) {
     // native_method_throw_unsatisfied_link_error_entry() should only
     // be passed when post_event_flag is false.
     assert(function !=
       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
       "post_event_flag mis-match");
     // post the bind event, and possible change the bind function
     JvmtiExport::post_native_method_bind(this, &function);
   }
   *native_function = function;
   // This function can be called more than once. We must make sure that we always
   // use the latest registered method -> check if a stub already has been generated.
   // If so, we have to make it not_entrant.
   nmethod* nm = code(); // Put it into local variable to guard against concurrent updates
   if (nm != NULL) {
     nm->make_not_entrant();
   }
 }
 bool Method::has_native_function() const {
   if (is_method_handle_intrinsic())
     return false;  // special-cased in SharedRuntime::generate_native_wrapper
   address func = native_function();
   return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
 }
 void Method::clear_native_function() {
   // Note: is_method_handle_intrinsic() is allowed here.
   set_native_function(
     SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
     !native_bind_event_is_interesting);
   clear_code();
 }
 address Method::critical_native_function() {
   methodHandle mh(this);
   return NativeLookup::lookup_critical_entry(mh);
 }
 void Method::set_signature_handler(address handler) {
   address* signature_handler =  signature_handler_addr();
   *signature_handler = handler;
 }
 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) {
   if (PrintCompilation && report) {
     ttyLocker ttyl;
     tty->print("made not %scompilable on ", is_osr ? "OSR " : "");
     if (comp_level == CompLevel_all) {
       tty->print("all levels ");
     } else {
       tty->print("levels ");
       for (int i = (int)CompLevel_none; i <= comp_level; i++) {
         tty->print("%d ", i);
       }
     }
     this->print_short_name(tty);
     int size = this->code_size();
     if (size > 0) {
       tty->print(" (%d bytes)", size);
     }
     if (reason != NULL) {
       tty->print("   %s", reason);
     }
     tty->cr();
   }
   if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) {
     ttyLocker ttyl;
     xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'",
                      is_osr ? "osr_" : "", os::current_thread_id());
     if (reason != NULL) {
       xtty->print(" reason=\'%s\'", reason);
     }
     xtty->method(this);
     xtty->stamp();
     xtty->end_elem();
   }
 }
 bool Method::is_always_compilable() const {
   // Generated adapters must be compiled
   if (is_method_handle_intrinsic() && is_synthetic()) {
     assert(!is_not_c1_compilable(), "sanity check");
     assert(!is_not_c2_compilable(), "sanity check");
     return true;
   }
   return false;
 }
 bool Method::is_not_compilable(int comp_level) const {
   if (number_of_breakpoints() > 0)
     return true;
   if (is_always_compilable())
     return false;
   if (comp_level == CompLevel_any)
     return is_not_c1_compilable() || is_not_c2_compilable();
   if (is_c1_compile(comp_level))
     return is_not_c1_compilable();
   if (is_c2_compile(comp_level))
     return is_not_c2_compilable();
   return false;
 }
 // call this when compiler finds that this method is not compilable
 void Method::set_not_compilable(int comp_level, bool report, const char* reason) {
   if (is_always_compilable()) {
     // Don't mark a method which should be always compilable
     return;
   }
   print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason);
   if (comp_level == CompLevel_all) {
     set_not_c1_compilable();
     set_not_c2_compilable();
   } else {
     if (is_c1_compile(comp_level))
       set_not_c1_compilable();
     if (is_c2_compile(comp_level))
       set_not_c2_compilable();
   }
   CompilationPolicy::policy()->disable_compilation(this);
   assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check");
 }
 bool Method::is_not_osr_compilable(int comp_level) const {
   if (is_not_compilable(comp_level))
     return true;
   if (comp_level == CompLevel_any)
     return is_not_c1_osr_compilable() || is_not_c2_osr_compilable();
   if (is_c1_compile(comp_level))
     return is_not_c1_osr_compilable();
   if (is_c2_compile(comp_level))
     return is_not_c2_osr_compilable();
   return false;
 }
 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) {
   print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason);
   if (comp_level == CompLevel_all) {
     set_not_c1_osr_compilable();
     set_not_c2_osr_compilable();
   } else {
     if (is_c1_compile(comp_level))
       set_not_c1_osr_compilable();
     if (is_c2_compile(comp_level))
       set_not_c2_osr_compilable();
   }
   CompilationPolicy::policy()->disable_compilation(this);
   assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check");
 }
 // Revert to using the interpreter and clear out the nmethod
 void Method::clear_code() {
   // this may be NULL if c2i adapters have not been made yet
   // Only should happen at allocate time.
   if (_adapter == NULL) {
     _from_compiled_entry    = NULL;
   } else {
     _from_compiled_entry    = _adapter->get_c2i_entry();
   }
   OrderAccess::storestore();
   _from_interpreted_entry = _i2i_entry;
   OrderAccess::storestore();
   _code = NULL;
 }
 // Called by class data sharing to remove any entry points (which are not shared)
 void Method::unlink_method() {
   _code = NULL;
   _i2i_entry = NULL;
   _from_interpreted_entry = NULL;
   if (is_native()) {
     *native_function_addr() = NULL;
     set_signature_handler(NULL);
   }
   NOT_PRODUCT(set_compiled_invocation_count(0);)
   _adapter = NULL;
   _from_compiled_entry = NULL;
   // In case of DumpSharedSpaces, _method_data should always be NULL.
   //
   // During runtime (!DumpSharedSpaces), when we are cleaning a
   // shared class that failed to load, this->link_method() may
   // have already been called (before an exception happened), so
   // this->_method_data may not be NULL.
   assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
   set_method_data(NULL);
   set_method_counters(NULL);
 }
 // Called when the method_holder is getting linked. Setup entrypoints so the method
 // is ready to be called from interpreter, compiler, and vtables.
 void Method::link_method(methodHandle h_method, TRAPS) {
   // If the code cache is full, we may reenter this function for the
   // leftover methods that weren't linked.
   if (_i2i_entry != NULL) return;
   assert(_adapter == NULL, "init'd to NULL" );
   assert( _code == NULL, "nothing compiled yet" );
   // Setup interpreter entrypoint
   assert(this == h_method(), "wrong h_method()" );
   address entry = Interpreter::entry_for_method(h_method);
   assert(entry != NULL, "interpreter entry must be non-null");
   // Sets both _i2i_entry and _from_interpreted_entry
   set_interpreter_entry(entry);
   // Don't overwrite already registered native entries.
   if (is_native() && !has_native_function()) {
     set_native_function(
       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
       !native_bind_event_is_interesting);
   }
   // Setup compiler entrypoint.  This is made eagerly, so we do not need
   // special handling of vtables.  An alternative is to make adapters more
   // lazily by calling make_adapter() from from_compiled_entry() for the
   // normal calls.  For vtable calls life gets more complicated.  When a
   // call-site goes mega-morphic we need adapters in all methods which can be
   // called from the vtable.  We need adapters on such methods that get loaded
   // later.  Ditto for mega-morphic itable calls.  If this proves to be a
   // problem we'll make these lazily later.
   (void) make_adapters(h_method, CHECK);
   // ONLY USE the h_method now as make_adapter may have blocked
 }
 address Method::make_adapters(methodHandle mh, TRAPS) {
   // Adapters for compiled code are made eagerly here.  They are fairly
   // small (generally < 100 bytes) and quick to make (and cached and shared)
   // so making them eagerly shouldn't be too expensive.
   AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh);
   if (adapter == NULL ) {
     THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters");
   }
   mh->set_adapter_entry(adapter);
   mh->_from_compiled_entry = adapter->get_c2i_entry();
   return adapter->get_c2i_entry();
 }
 // The verified_code_entry() must be called when a invoke is resolved
 // on this method.
 // It returns the compiled code entry point, after asserting not null.
 // This function is called after potential safepoints so that nmethod
 // or adapter that it points to is still live and valid.
 // This function must not hit a safepoint!
 address Method::verified_code_entry() {
   debug_only(No_Safepoint_Verifier nsv;)
   assert(_from_compiled_entry != NULL, "must be set");
   return _from_compiled_entry;
 }
 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
 // (could be racing a deopt).
 // Not inline to avoid circular ref.
 bool Method::check_code() const {
   // cached in a register or local.  There's a race on the value of the field.
   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
   return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
 }
 // Install compiled code.  Instantly it can execute.
 void Method::set_code(methodHandle mh, nmethod *code) {
   assert( code, "use clear_code to remove code" );
   assert( mh->check_code(), "" );
   guarantee(mh->adapter() != NULL, "Adapter blob must already exist!");
   // These writes must happen in this order, because the interpreter will
   // directly jump to from_interpreted_entry which jumps to an i2c adapter
   // which jumps to _from_compiled_entry.
   mh->_code = code;             // Assign before allowing compiled code to exec
   int comp_level = code->comp_level();
   // In theory there could be a race here. In practice it is unlikely
   // and not worth worrying about.
   if (comp_level > mh->highest_comp_level()) {
     mh->set_highest_comp_level(comp_level);
   }
   OrderAccess::storestore();
 #ifdef SHARK
   mh->_from_interpreted_entry = code->insts_begin();
 #else //!SHARK
   mh->_from_compiled_entry = code->verified_entry_point();
   OrderAccess::storestore();
   // Instantly compiled code can execute.
   if (!mh->is_method_handle_intrinsic())
     mh->_from_interpreted_entry = mh->get_i2c_entry();
 #endif //!SHARK
 }
 bool Method::is_overridden_in(Klass* k) const {
   InstanceKlass* ik = InstanceKlass::cast(k);
   if (ik->is_interface()) return false;
   // If method is an interface, we skip it - except if it
   // is a miranda method
   if (method_holder()->is_interface()) {
     // Check that method is not a miranda method
     if (ik->lookup_method(name(), signature()) == NULL) {
       // No implementation exist - so miranda method
       return false;
     }
     return true;
   }
   assert(ik->is_subclass_of(method_holder()), "should be subklass");
   assert(ik->vtable() != NULL, "vtable should exist");
   if (!has_vtable_index()) {
     return false;
   } else {
     Method* vt_m = ik->method_at_vtable(vtable_index());
     return vt_m != this;
   }
 }
 // give advice about whether this Method* should be cached or not
 bool Method::should_not_be_cached() const {
   if (is_old()) {
     // This method has been redefined. It is either EMCP or obsolete
     // and we don't want to cache it because that would pin the method
     // down and prevent it from being collectible if and when it
     // finishes executing.
     return true;
   }
   // caching this method should be just fine
   return false;
 }
 /**
  *  Returns true if this is one of the specially treated methods for
  *  security related stack walks (like Reflection.getCallerClass).
  */
 bool Method::is_ignored_by_security_stack_walk() const {
   const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection;
   if (intrinsic_id() == vmIntrinsics::_invoke) {
     // This is Method.invoke() -- ignore it
     return true;
   }
   if (use_new_reflection &&
       method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) {
     // This is an auxilary frame -- ignore it
     return true;
   }
   if (is_method_handle_intrinsic() || is_compiled_lambda_form()) {
     // This is an internal adapter frame for method handles -- ignore it
     return true;
   }
   return false;
 }
 // Constant pool structure for invoke methods:
 enum {
   _imcp_invoke_name = 1,        // utf8: 'invokeExact', etc.
   _imcp_invoke_signature,       // utf8: (variable Symbol*)
   _imcp_limit
 };
 // Test if this method is an MH adapter frame generated by Java code.
 // Cf. java/lang/invoke/InvokerBytecodeGenerator
 bool Method::is_compiled_lambda_form() const {
   return intrinsic_id() == vmIntrinsics::_compiledLambdaForm;
 }
 // Test if this method is an internal MH primitive method.
 bool Method::is_method_handle_intrinsic() const {
   vmIntrinsics::ID iid = intrinsic_id();
   return (MethodHandles::is_signature_polymorphic(iid) &&
           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 }
 bool Method::has_member_arg() const {
   vmIntrinsics::ID iid = intrinsic_id();
   return (MethodHandles::is_signature_polymorphic(iid) &&
           MethodHandles::has_member_arg(iid));
 }
 // Make an instance of a signature-polymorphic internal MH primitive.
 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
                                                          Symbol* signature,
                                                          TRAPS) {
   ResourceMark rm;
   methodHandle empty;
   KlassHandle holder = SystemDictionary::MethodHandle_klass();
   Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid);
   assert(iid == MethodHandles::signature_polymorphic_name_id(name), "");
   if (TraceMethodHandles) {
     tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string());
   }
   // invariant:   cp->symbol_at_put is preceded by a refcount increment (more usually a lookup)
   name->increment_refcount();
   signature->increment_refcount();
   int cp_length = _imcp_limit;
   ClassLoaderData* loader_data = holder->class_loader_data();
   constantPoolHandle cp;
   {
     ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty));
     cp = constantPoolHandle(THREAD, cp_oop);
   }
   cp->set_pool_holder(InstanceKlass::cast(holder()));
   cp->symbol_at_put(_imcp_invoke_name,       name);
   cp->symbol_at_put(_imcp_invoke_signature,  signature);
   cp->set_has_preresolution();
   // decide on access bits:  public or not?
   int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
   bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
   if (must_be_static)  flags_bits |= JVM_ACC_STATIC;
   assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");
   methodHandle m;
   {
     InlineTableSizes sizes;
     Method* m_oop = Method::allocate(loader_data, 0,
                                      accessFlags_from(flags_bits), &sizes,
                                      ConstMethod::NORMAL, CHECK_(empty));
     m = methodHandle(THREAD, m_oop);
   }
   m->set_constants(cp());
   m->set_name_index(_imcp_invoke_name);
   m->set_signature_index(_imcp_invoke_signature);
   assert(MethodHandles::is_signature_polymorphic_name(m->name()), "");
   assert(m->signature() == signature, "");
 #ifdef CC_INTERP
   ResultTypeFinder rtf(signature);
   m->set_result_index(rtf.type());
 #endif
   m->compute_size_of_parameters(THREAD);
   m->init_intrinsic_id();
   assert(m->is_method_handle_intrinsic(), "");
 #ifdef ASSERT
   if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id()))  m->print();
   assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker");
   assert(m->intrinsic_id() == iid, "correctly predicted iid");
 #endif //ASSERT
   // Finally, set up its entry points.
   assert(m->can_be_statically_bound(), "");
   m->set_vtable_index(Method::nonvirtual_vtable_index);
   m->link_method(m, CHECK_(empty));
   if (TraceMethodHandles && (Verbose || WizardMode))
     m->print_on(tty);
   return m;
 }
 Klass* Method::check_non_bcp_klass(Klass* klass) {
   if (klass != NULL && klass->class_loader() != NULL) {
     if (klass->oop_is_objArray())
       klass = ObjArrayKlass::cast(klass)->bottom_klass();
     return klass;
   }
   return NULL;
 }
 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
   // Code below does not work for native methods - they should never get rewritten anyway
   assert(!m->is_native(), "cannot rewrite native methods");
   // Allocate new Method*
   AccessFlags flags = m->access_flags();
   ConstMethod* cm = m->constMethod();
   int checked_exceptions_len = cm->checked_exceptions_length();
   int localvariable_len = cm->localvariable_table_length();
   int exception_table_len = cm->exception_table_length();
   int method_parameters_len = cm->method_parameters_length();
   int method_annotations_len = cm->method_annotations_length();
   int parameter_annotations_len = cm->parameter_annotations_length();
   int type_annotations_len = cm->type_annotations_length();
   int default_annotations_len = cm->default_annotations_length();
   InlineTableSizes sizes(
       localvariable_len,
       new_compressed_linenumber_size,
       exception_table_len,
       checked_exceptions_len,
       method_parameters_len,
       cm->generic_signature_index(),
       method_annotations_len,
       parameter_annotations_len,
       type_annotations_len,
       default_annotations_len,
 );
   ClassLoaderData* loader_data = m->method_holder()->class_loader_data();
   Method* newm_oop = Method::allocate(loader_data,
                                       new_code_length,
                                       flags,
                                       &sizes,
                                       m->method_type(),
                                       CHECK_(methodHandle()));
   methodHandle newm (THREAD, newm_oop);
   int new_method_size = newm->method_size();
   // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod*
   ConstMethod* newcm = newm->constMethod();
   int new_const_method_size = newm->constMethod()->size();
   memcpy(newm(), m(), sizeof(Method));
   // Create shallow copy of ConstMethod.
   memcpy(newcm, m->constMethod(), sizeof(ConstMethod));
   // Reset correct method/const method, method size, and parameter info
   newm->set_constMethod(newcm);
   newm->constMethod()->set_code_size(new_code_length);
   newm->constMethod()->set_constMethod_size(new_const_method_size);
   newm->set_method_size(new_method_size);
   assert(newm->code_size() == new_code_length, "check");
   assert(newm->method_parameters_length() == method_parameters_len, "check");
   assert(newm->checked_exceptions_length() == checked_exceptions_len, "check");
   assert(newm->exception_table_length() == exception_table_len, "check");
   assert(newm->localvariable_table_length() == localvariable_len, "check");
   // Copy new byte codes
   memcpy(newm->code_base(), new_code, new_code_length);
   // Copy line number table
   if (new_compressed_linenumber_size > 0) {
     memcpy(newm->compressed_linenumber_table(),
            new_compressed_linenumber_table,
            new_compressed_linenumber_size);
   }
   // Copy method_parameters
   if (method_parameters_len > 0) {
     memcpy(newm->method_parameters_start(),
            m->method_parameters_start(),
            method_parameters_len * sizeof(MethodParametersElement));
   }
   // Copy checked_exceptions
   if (checked_exceptions_len > 0) {
     memcpy(newm->checked_exceptions_start(),
            m->checked_exceptions_start(),
            checked_exceptions_len * sizeof(CheckedExceptionElement));
   }
   // Copy exception table
   if (exception_table_len > 0) {
     memcpy(newm->exception_table_start(),
            m->exception_table_start(),
            exception_table_len * sizeof(ExceptionTableElement));
   }
   // Copy local variable number table
   if (localvariable_len > 0) {
     memcpy(newm->localvariable_table_start(),
            m->localvariable_table_start(),
            localvariable_len * sizeof(LocalVariableTableElement));
   }
   // Copy stackmap table
   if (m->has_stackmap_table()) {
     int code_attribute_length = m->stackmap_data()->length();
     Array<u1>* stackmap_data =
       MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL);
     memcpy((void*)stackmap_data->adr_at(0),
            (void*)m->stackmap_data()->adr_at(0), code_attribute_length);
     newm->set_stackmap_data(stackmap_data);
   }
   // copy annotations over to new method
   newcm->copy_annotations_from(cm);
   return newm;
 }
 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) {
   // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics
   // because we are not loading from core libraries
   // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar
   // which does not use the class default class loader so we check for its loader here
   InstanceKlass* ik = InstanceKlass::cast(holder);
   if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) {
     return vmSymbols::NO_SID;   // regardless of name, no intrinsics here
   }
   // see if the klass name is well-known:
   Symbol* klass_name = ik->name();
   return vmSymbols::find_sid(klass_name);
 }
 void Method::init_intrinsic_id() {
   assert(_intrinsic_id == vmIntrinsics::_none, "do this just once");
   const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte));
   assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size");
   assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), "");
   // the klass name is well-known:
   vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder());
   assert(klass_id != vmSymbols::NO_SID, "caller responsibility");
   // ditto for method and signature:
   vmSymbols::SID  name_id = vmSymbols::find_sid(name());
   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
       && name_id == vmSymbols::NO_SID)
     return;
   vmSymbols::SID   sig_id = vmSymbols::find_sid(signature());
   if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle)
       && sig_id == vmSymbols::NO_SID)  return;
   jshort flags = access_flags().as_short();
   vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
   if (id != vmIntrinsics::_none) {
     set_intrinsic_id(id);
     return;
   }
   // A few slightly irregular cases:
   switch (klass_id) {
   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath):
     // Second chance: check in regular Math.
     switch (name_id) {
     case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name):
     case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name):
     case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name):
       // pretend it is the corresponding method in the non-strict class:
       klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math);
       id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags);
       break;
     }
     break;
   // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*.
   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle):
     if (!is_native())  break;
     id = MethodHandles::signature_polymorphic_name_id(method_holder(), name());
     if (is_static() != MethodHandles::is_signature_polymorphic_static(id))
       id = vmIntrinsics::_none;
     break;
   }
   if (id != vmIntrinsics::_none) {
     // Set up its iid.  It is an alias method.
     set_intrinsic_id(id);
     return;
   }
 }
 // These two methods are static since a GC may move the Method
 bool Method::load_signature_classes(methodHandle m, TRAPS) {
   if (THREAD->is_Compiler_thread()) {
     // There is nothing useful this routine can do from within the Compile thread.
     // Hopefully, the signature contains only well-known classes.
     // We could scan for this and return true/false, but the caller won't care.
     return false;
   }
   bool sig_is_loaded = true;
   Handle class_loader(THREAD, m->method_holder()->class_loader());
   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
   ResourceMark rm(THREAD);
   Symbol*  signature = m->signature();
   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
     if (ss.is_object()) {
       Symbol* sym = ss.as_symbol(CHECK_(false));
       Symbol*  name  = sym;
       Klass* klass = SystemDictionary::resolve_or_null(name, class_loader,
                                              protection_domain, THREAD);
       // We are loading classes eagerly. If a ClassNotFoundException or
       // a LinkageError was generated, be sure to ignore it.
       if (HAS_PENDING_EXCEPTION) {
         if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) ||
             PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
           CLEAR_PENDING_EXCEPTION;
         } else {
           return false;
         }
       }
       if( klass == NULL) { sig_is_loaded = false; }
     }
   }
   return sig_is_loaded;
 }
 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) {
   Handle class_loader(THREAD, m->method_holder()->class_loader());
   Handle protection_domain(THREAD, m->method_holder()->protection_domain());
   ResourceMark rm(THREAD);
   Symbol*  signature = m->signature();
   for(SignatureStream ss(signature); !ss.is_done(); ss.next()) {
     if (ss.type() == T_OBJECT) {
       Symbol* name = ss.as_symbol_or_null();
       if (name == NULL) return true;
       Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD);
       if (klass == NULL) return true;
     }
   }
   return false;
 }
 // Exposed so field engineers can debug VM
 void Method::print_short_name(outputStream* st) {
   ResourceMark rm;
 #ifdef PRODUCT
   st->print(" %s::", method_holder()->external_name());
 #else
   st->print(" %s::", method_holder()->internal_name());
 #endif
   name()->print_symbol_on(st);
   if (WizardMode) signature()->print_symbol_on(st);
   else if (MethodHandles::is_signature_polymorphic(intrinsic_id()))
     MethodHandles::print_as_basic_type_signature_on(st, signature(), true);
 }
 // Comparer for sorting an object array containing
 // Method*s.
 static int method_comparator(Method* a, Method* b) {
   return a->name()->fast_compare(b->name());
 }
 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array
 // default_methods also uses this without the ordering for fast find_method
 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) {
   int length = methods->length();
   if (length > 1) {
     {
       No_Safepoint_Verifier nsv;
       QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent);
     }
     // Reset method ordering
     if (set_idnums) {
       for (int i = 0; i < length; i++) {
         Method* m = methods->at(i);
         m->set_method_idnum(i);
       }
     }
   }
 }
 //-----------------------------------------------------------------------------------
 // Non-product code unless JVM/TI needs it
 #if !defined(PRODUCT) || INCLUDE_JVMTI
 class SignatureTypePrinter : public SignatureTypeNames {
  private:
   outputStream* _st;
   bool _use_separator;
   void type_name(const char* name) {
     if (_use_separator) _st->print(", ");
     _st->print(name);
     _use_separator = true;
   }
  public:
   SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) {
     _st = st;
     _use_separator = false;
   }
   void print_parameters()              { _use_separator = false; iterate_parameters(); }
   void print_returntype()              { _use_separator = false; iterate_returntype(); }
 };
 void Method::print_name(outputStream* st) {
   Thread *thread = Thread::current();
   ResourceMark rm(thread);
   SignatureTypePrinter sig(signature(), st);
   st->print("%s ", is_static() ? "static" : "virtual");
   sig.print_returntype();
   st->print(" %s.", method_holder()->internal_name());
   name()->print_symbol_on(st);
   st->print("(");
   sig.print_parameters();
   st->print(")");
 }
 #endif // !PRODUCT || INCLUDE_JVMTI
 //-----------------------------------------------------------------------------------
 // Non-product code
 #ifndef PRODUCT
 void Method::print_codes_on(outputStream* st) const {
   print_codes_on(0, code_size(), st);
 }
 void Method::print_codes_on(int from, int to, outputStream* st) const {
   Thread *thread = Thread::current();
   ResourceMark rm(thread);
   methodHandle mh (thread, (Method*)this);
   BytecodeStream s(mh);
   s.set_interval(from, to);
   BytecodeTracer::set_closure(BytecodeTracer::std_closure());
   while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
 }
 #endif // not PRODUCT
 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
 // as end-of-stream terminator.
 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
   // bci and line number does not compress into single byte.
   // Write out escape character and use regular compression for bci and line number.
   write_byte((jubyte)0xFF);
   write_signed_int(bci_delta);
   write_signed_int(line_delta);
 }
 // See comment in method.hpp which explains why this exists.
 #if defined(_M_AMD64) && _MSC_VER >= 1400
 #pragma optimize("", off)
 void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
   write_pair_inline(bci, line);
 }
 #pragma optimize("", on)
 #endif
 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
   _bci = 0;
   _line = 0;
 };
 bool CompressedLineNumberReadStream::read_pair() {
   jubyte next = read_byte();
   // Check for terminator
   if (next == 0) return false;
   if (next == 0xFF) {
     // Escape character, regular compression used
     _bci  += read_signed_int();
     _line += read_signed_int();
   } else {
     // Single byte compression used
     _bci  += next >> 3;
     _line += next & 0x7;
   }
   return true;
 }
 Bytecodes::Code Method::orig_bytecode_at(int bci) const {
   BreakpointInfo* bp = method_holder()->breakpoints();
   for (; bp != NULL; bp = bp->next()) {
     if (bp->match(this, bci)) {
       return bp->orig_bytecode();
     }
   }
   {
     ResourceMark rm;
     fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci));
   }
   return Bytecodes::_shouldnotreachhere;
 }
 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) {
   assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way");
   BreakpointInfo* bp = method_holder()->breakpoints();
   for (; bp != NULL; bp = bp->next()) {
     if (bp->match(this, bci)) {
       bp->set_orig_bytecode(code);
       // and continue, in case there is more than one
     }
   }
 }
 void Method::set_breakpoint(int bci) {
   InstanceKlass* ik = method_holder();
   BreakpointInfo *bp = new BreakpointInfo(this, bci);
   bp->set_next(ik->breakpoints());
   ik->set_breakpoints(bp);
   // do this last:
   bp->set(this);
 }
 static void clear_matches(Method* m, int bci) {
   InstanceKlass* ik = m->method_holder();
   BreakpointInfo* prev_bp = NULL;
   BreakpointInfo* next_bp;
   for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) {
     next_bp = bp->next();
     // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint).
     if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) {
       // do this first:
       bp->clear(m);
       // unhook it
       if (prev_bp != NULL)
         prev_bp->set_next(next_bp);
       else
         ik->set_breakpoints(next_bp);
       delete bp;
       // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods
       // at same location. So we have multiple matching (method_index and bci)
       // BreakpointInfo nodes in BreakpointInfo list. We should just delete one
       // breakpoint for clear_breakpoint request and keep all other method versions
       // BreakpointInfo for future clear_breakpoint request.
       // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints)
       // which is being called when class is unloaded. We delete all the Breakpoint
       // information for all versions of method. We may not correctly restore the original
       // bytecode in all method versions, but that is ok. Because the class is being unloaded
       // so these methods won't be used anymore.
       if (bci >= 0) {
         break;
       }
     } else {
       // This one is a keeper.
       prev_bp = bp;
     }
   }
 }
 void Method::clear_breakpoint(int bci) {
   assert(bci >= 0, "");
   clear_matches(this, bci);
 }
 void Method::clear_all_breakpoints() {
   clear_matches(this, -1);
 }
 int Method::invocation_count() {
   MethodCounters *mcs = method_counters();
   if (TieredCompilation) {
     MethodData* const mdo = method_data();
     if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) ||
         ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) {
       return InvocationCounter::count_limit;
     } else {
       return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) +
              ((mdo != NULL) ? mdo->invocation_counter()->count() : 0);
     }
   } else {
     return (mcs == NULL) ? 0 : mcs->invocation_counter()->count();
   }
 }
 int Method::backedge_count() {
   MethodCounters *mcs = method_counters();
   if (TieredCompilation) {
     MethodData* const mdo = method_data();
     if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) ||
         ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) {
       return InvocationCounter::count_limit;
     } else {
       return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) +
              ((mdo != NULL) ? mdo->backedge_counter()->count() : 0);
     }
   } else {
     return (mcs == NULL) ? 0 : mcs->backedge_counter()->count();
   }
 }
 int Method::highest_comp_level() const {
   const MethodData* mdo = method_data();
   if (mdo != NULL) {
     return mdo->highest_comp_level();
   } else {
     return CompLevel_none;
   }
 }
 int Method::highest_osr_comp_level() const {
   const MethodData* mdo = method_data();
   if (mdo != NULL) {
     return mdo->highest_osr_comp_level();
   } else {
     return CompLevel_none;
   }
 }
 void Method::set_highest_comp_level(int level) {
   MethodData* mdo = method_data();
   if (mdo != NULL) {
     mdo->set_highest_comp_level(level);
   }
 }
 void Method::set_highest_osr_comp_level(int level) {
   MethodData* mdo = method_data();
   if (mdo != NULL) {
     mdo->set_highest_osr_comp_level(level);
   }
 }
 BreakpointInfo::BreakpointInfo(Method* m, int bci) {
   _bci = bci;
   _name_index = m->name_index();
   _signature_index = m->signature_index();
   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
   if (_orig_bytecode == Bytecodes::_breakpoint)
     _orig_bytecode = m->orig_bytecode_at(_bci);
   _next = NULL;
 }
 void BreakpointInfo::set(Method* method) {
 #ifdef ASSERT
   {
     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
     if (code == Bytecodes::_breakpoint)
       code = method->orig_bytecode_at(_bci);
     assert(orig_bytecode() == code, "original bytecode must be the same");
   }
 #endif
   Thread *thread = Thread::current();
   *method->bcp_from(_bci) = Bytecodes::_breakpoint;
   method->incr_number_of_breakpoints(thread);
   SystemDictionary::notice_modification();
   {
     // Deoptimize all dependents on this method
     HandleMark hm(thread);
     methodHandle mh(thread, method);
     Universe::flush_dependents_on_method(mh);
   }
 }
 void BreakpointInfo::clear(Method* method) {
   *method->bcp_from(_bci) = orig_bytecode();
   assert(method->number_of_breakpoints() > 0, "must not go negative");
   method->decr_number_of_breakpoints(Thread::current());
 }
 // jmethodID handling
 // This is a block allocating object, sort of like JNIHandleBlock, only a
 // lot simpler.  There aren't many of these, they aren't long, they are rarely
 // deleted and so we can do some suboptimal things.
 // It's allocated on the CHeap because once we allocate a jmethodID, we can
 // never get rid of it.
 // It would be nice to be able to parameterize the number of methods for
 // the null_class_loader but then we'd have to turn this and ClassLoaderData
 // into templates.
 // I feel like this brain dead class should exist somewhere in the STL
 class JNIMethodBlock : public CHeapObj<mtClass> {
   enum { number_of_methods = 8 };
   Method*         _methods[number_of_methods];
   int             _top;
   JNIMethodBlock* _next;
  public:
   static Method* const _free_method;
   JNIMethodBlock() : _next(NULL), _top(0) {
     for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method;
   }
   Method** add_method(Method* m) {
     if (_top < number_of_methods) {
       // top points to the next free entry.
       int i = _top;
       _methods[i] = m;
       _top++;
       return &_methods[i];
     } else if (_top == number_of_methods) {
       // if the next free entry ran off the block see if there's a free entry
       for (int i = 0; i< number_of_methods; i++) {
         if (_methods[i] == _free_method) {
           _methods[i] = m;
           return &_methods[i];
         }
       }
       // Only check each block once for frees.  They're very unlikely.
       // Increment top past the end of the block.
       _top++;
     }
     // need to allocate a next block.
     if (_next == NULL) {
       _next = new JNIMethodBlock();
     }
     return _next->add_method(m);
   }
   bool contains(Method** m) {
     for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
       for (int i = 0; i< number_of_methods; i++) {
         if (&(b->_methods[i]) == m) {
           return true;
         }
       }
     }
     return false;  // not found
   }
   // Doesn't really destroy it, just marks it as free so it can be reused.
   void destroy_method(Method** m) {
 #ifdef ASSERT
     assert(contains(m), "should be a methodID");
 #endif // ASSERT
     *m = _free_method;
   }
   // During class unloading the methods are cleared, which is different
   // than freed.
   void clear_all_methods() {
     for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
       for (int i = 0; i< number_of_methods; i++) {
         _methods[i] = NULL;
       }
     }
   }
 #ifndef PRODUCT
   int count_methods() {
     // count all allocated methods
     int count = 0;
     for (JNIMethodBlock* b = this; b != NULL; b = b->_next) {
       for (int i = 0; i< number_of_methods; i++) {
         if (_methods[i] != _free_method) count++;
       }
     }
     return count;
   }
 #endif // PRODUCT
 };
 // Something that can't be mistaken for an address or a markOop
 Method* const JNIMethodBlock::_free_method = (Method*)55;
 // Add a method id to the jmethod_ids
 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
   ClassLoaderData* cld = loader_data;
   if (!SafepointSynchronize::is_at_safepoint()) {
     // Have to add jmethod_ids() to class loader data thread-safely.
     // Also have to add the method to the list safely, which the cld lock
     // protects as well.
     MutexLockerEx ml(cld->metaspace_lock(),  Mutex::_no_safepoint_check_flag);
     if (cld->jmethod_ids() == NULL) {
       cld->set_jmethod_ids(new JNIMethodBlock());
     }
     // jmethodID is a pointer to Method*
     return (jmethodID)cld->jmethod_ids()->add_method(m);
   } else {
     // At safepoint, we are single threaded and can set this.
     if (cld->jmethod_ids() == NULL) {
       cld->set_jmethod_ids(new JNIMethodBlock());
     }
     // jmethodID is a pointer to Method*
     return (jmethodID)cld->jmethod_ids()->add_method(m);
   }
 }
 // Mark a jmethodID as free.  This is called when there is a data race in
 // InstanceKlass while creating the jmethodID cache.
 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) {
   ClassLoaderData* cld = loader_data;
   Method** ptr = (Method**)m;
   assert(cld->jmethod_ids() != NULL, "should have method handles");
   cld->jmethod_ids()->destroy_method(ptr);
 }
 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) {
   // Can't assert the method_holder is the same because the new method has the
   // scratch method holder.
   assert(resolve_jmethod_id(jmid)->method_holder()->class_loader()
            == new_method->method_holder()->class_loader(),
          "changing to a different class loader");
   // Just change the method in place, jmethodID pointer doesn't change.
   *((Method**)jmid) = new_method;
 }
 bool Method::is_method_id(jmethodID mid) {
   Method* m = resolve_jmethod_id(mid);
   assert(m != NULL, "should be called with non-null method");
   InstanceKlass* ik = m->method_holder();
   ClassLoaderData* cld = ik->class_loader_data();
   if (cld->jmethod_ids() == NULL) return false;
   return (cld->jmethod_ids()->contains((Method**)mid));
 }
 Method* Method::checked_resolve_jmethod_id(jmethodID mid) {
   if (mid == NULL) return NULL;
   Method* o = resolve_jmethod_id(mid);
   if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) {
     return NULL;
   }
   return o;
 };
 void Method::set_on_stack(const bool value) {
   // Set both the method itself and its constant pool.  The constant pool
   // on stack means some method referring to it is also on the stack.
   _access_flags.set_on_stack(value);
   constants()->set_on_stack(value);
   if (value) MetadataOnStackMark::record(this);
 }
 // Called when the class loader is unloaded to make all methods weak.
 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) {
   loader_data->jmethod_ids()->clear_all_methods();
 }
 // Check that this pointer is valid by checking that the vtbl pointer matches
 bool Method::is_valid_method() const {
   if (this == NULL) {
     return false;
   } else if (!is_metaspace_object()) {
     return false;
   } else {
     Method m;
     // This assumes that the vtbl pointer is the first word of a C++ object.
     // This assumption is also in universe.cpp patch_klass_vtble
     void* vtbl2 = dereference_vptr((void*)&m);
     void* this_vtbl = dereference_vptr((void*)this);
     return vtbl2 == this_vtbl;
   }
 }
 #ifndef PRODUCT
 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) {
   out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods());
 }
 #endif // PRODUCT
 // Printing
 #ifndef PRODUCT
 void Method::print_on(outputStream* st) const {
   ResourceMark rm;
   assert(is_method(), "must be method");
   st->print_cr(internal_name());
   // get the effect of PrintOopAddress, always, for methods:
   st->print_cr(" - this oop:          "INTPTR_FORMAT, (intptr_t)this);
   st->print   (" - method holder:     "); method_holder()->print_value_on(st); st->cr();
   st->print   (" - constants:         "INTPTR_FORMAT" ", (address)constants());
   constants()->print_value_on(st); st->cr();
   st->print   (" - access:            0x%x  ", access_flags().as_int()); access_flags().print_on(st); st->cr();
   st->print   (" - name:              ");    name()->print_value_on(st); st->cr();
   st->print   (" - signature:         ");    signature()->print_value_on(st); st->cr();
   st->print_cr(" - max stack:         %d",   max_stack());
   st->print_cr(" - max locals:        %d",   max_locals());
   st->print_cr(" - size of params:    %d",   size_of_parameters());
   st->print_cr(" - method size:       %d",   method_size());
   if (intrinsic_id() != vmIntrinsics::_none)
     st->print_cr(" - intrinsic id:      %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id()));
   if (highest_comp_level() != CompLevel_none)
     st->print_cr(" - highest level:     %d", highest_comp_level());
   st->print_cr(" - vtable index:      %d",   _vtable_index);
   st->print_cr(" - i2i entry:         " INTPTR_FORMAT, interpreter_entry());
   st->print(   " - adapters:          ");
   AdapterHandlerEntry* a = ((Method*)this)->adapter();
   if (a == NULL)
     st->print_cr(INTPTR_FORMAT, a);
   else
     a->print_adapter_on(st);
   st->print_cr(" - compiled entry     " INTPTR_FORMAT, from_compiled_entry());
   st->print_cr(" - code size:         %d",   code_size());
   if (code_size() != 0) {
     st->print_cr(" - code start:        " INTPTR_FORMAT, code_base());
     st->print_cr(" - code end (excl):   " INTPTR_FORMAT, code_base() + code_size());
   }
   if (method_data() != NULL) {
     st->print_cr(" - method data:       " INTPTR_FORMAT, (address)method_data());
   }
   st->print_cr(" - checked ex length: %d",   checked_exceptions_length());
   if (checked_exceptions_length() > 0) {
     CheckedExceptionElement* table = checked_exceptions_start();
     st->print_cr(" - checked ex start:  " INTPTR_FORMAT, table);
     if (Verbose) {
       for (int i = 0; i < checked_exceptions_length(); i++) {
         st->print_cr("   - throws %s", constants()->printable_name_at(table[i].class_cp_index));
       }
     }
   }
   if (has_linenumber_table()) {
     u_char* table = compressed_linenumber_table();
     st->print_cr(" - linenumber start:  " INTPTR_FORMAT, table);
     if (Verbose) {
       CompressedLineNumberReadStream stream(table);
       while (stream.read_pair()) {
         st->print_cr("   - line %d: %d", stream.line(), stream.bci());
       }
     }
   }
   st->print_cr(" - localvar length:   %d",   localvariable_table_length());
   if (localvariable_table_length() > 0) {
     LocalVariableTableElement* table = localvariable_table_start();
     st->print_cr(" - localvar start:    " INTPTR_FORMAT, table);
     if (Verbose) {
       for (int i = 0; i < localvariable_table_length(); i++) {
         int bci = table[i].start_bci;
         int len = table[i].length;
         const char* name = constants()->printable_name_at(table[i].name_cp_index);
         const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index);
         int slot = table[i].slot;
         st->print_cr("   - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot);
       }
     }
   }
   if (code() != NULL) {
     st->print   (" - compiled code: ");
     code()->print_value_on(st);
   }
   if (is_native()) {
     st->print_cr(" - native function:   " INTPTR_FORMAT, native_function());
     st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler());
   }
 }
 #endif //PRODUCT
 void Method::print_value_on(outputStream* st) const {
   assert(is_method(), "must be method");
   st->print(internal_name());
   print_address_on(st);
   st->print(" ");
   name()->print_value_on(st);
   st->print(" ");
   signature()->print_value_on(st);
   st->print(" in ");
   method_holder()->print_value_on(st);
   if (WizardMode) st->print("#%d", _vtable_index);
   if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals());
   if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code());
 }
 #if INCLUDE_SERVICES
 // Size Statistics
 void Method::collect_statistics(KlassSizeStats *sz) const {
   int mysize = sz->count(this);
   sz->_method_bytes += mysize;
   sz->_method_all_bytes += mysize;
   sz->_rw_bytes += mysize;
   if (constMethod()) {
     constMethod()->collect_statistics(sz);
   }
   if (method_data()) {
     method_data()->collect_statistics(sz);
   }
 }
 #endif // INCLUDE_SERVICES
 // Verification
 void Method::verify_on(outputStream* st) {
   guarantee(is_method(), "object must be method");
   guarantee(constants()->is_constantPool(), "should be constant pool");
   guarantee(constMethod()->is_constMethod(), "should be ConstMethod*");
   MethodData* md = method_data();
   guarantee(md == NULL ||
       md->is_methodData(), "should be method data");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/method.cpp@5832cdaf89c6 (annotated)

src/share/vm/oops/method.cpp