jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@b2e698d2276c (annotated)

src/share/vm/ci/ciMethod.cpp@b2e698d2276c (annotated)

src/share/vm/ci/ciMethod.cpp

Fri, 13 Sep 2013 22:38:02 -0400

author: drchase
date: Fri, 13 Sep 2013 22:38:02 -0400
changeset 5732: b2e698d2276c
parent 5110: 6f3fd5150b67
child 5904: 5cc2d82aa82a
permissions: -rw-r--r--

8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation
Summary: Enhance method resolution and resulting data structures, plus some refactoring.
Reviewed-by: twisti, acorn, jrose

 /*
  * Copyright (c) 1999, 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 "ci/ciCallProfile.hpp"
 #include "ci/ciExceptionHandler.hpp"
 #include "ci/ciInstanceKlass.hpp"
 #include "ci/ciMethod.hpp"
 #include "ci/ciMethodBlocks.hpp"
 #include "ci/ciMethodData.hpp"
 #include "ci/ciStreams.hpp"
 #include "ci/ciSymbol.hpp"
 #include "ci/ciReplay.hpp"
 #include "ci/ciUtilities.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "compiler/abstractCompiler.hpp"
 #include "compiler/compilerOracle.hpp"
 #include "compiler/methodLiveness.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/generateOopMap.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/nativeLookup.hpp"
 #include "runtime/deoptimization.hpp"
 #include "utilities/bitMap.inline.hpp"
 #include "utilities/xmlstream.hpp"
 #ifdef COMPILER2
 #include "ci/bcEscapeAnalyzer.hpp"
 #include "ci/ciTypeFlow.hpp"
 #include "oops/method.hpp"
 #endif
 #ifdef SHARK
 #include "ci/ciTypeFlow.hpp"
 #include "oops/method.hpp"
 #endif
 // ciMethod
 //
 // This class represents a Method* in the HotSpot virtual
 // machine.
 // ------------------------------------------------------------------
 // ciMethod::ciMethod
 //
 // Loaded method.
 ciMethod::ciMethod(methodHandle h_m) : ciMetadata(h_m()) {
   assert(h_m() != NULL, "no null method");
   // These fields are always filled in in loaded methods.
   _flags = ciFlags(h_m()->access_flags());
   // Easy to compute, so fill them in now.
   _max_stack          = h_m()->max_stack();
   _max_locals         = h_m()->max_locals();
   _code_size          = h_m()->code_size();
   _intrinsic_id       = h_m()->intrinsic_id();
   _handler_count      = h_m()->exception_table_length();
   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();
   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
   _is_c1_compilable   = !h_m()->is_not_c1_compilable();
   _is_c2_compilable   = !h_m()->is_not_c2_compilable();
   // Lazy fields, filled in on demand.  Require allocation.
   _code               = NULL;
   _exception_handlers = NULL;
   _liveness           = NULL;
   _method_blocks = NULL;
 #if defined(COMPILER2) || defined(SHARK)
   _flow               = NULL;
   _bcea               = NULL;
 #endif // COMPILER2 || SHARK
   ciEnv *env = CURRENT_ENV;
   if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {
     // 6328518 check hotswap conditions under the right lock.
     MutexLocker locker(Compile_lock);
     if (Dependencies::check_evol_method(h_m()) != NULL) {
       _is_c1_compilable = false;
       _is_c2_compilable = false;
     }
   } else {
     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
   }
   if (h_m()->method_holder()->is_linked()) {
     _can_be_statically_bound = h_m()->can_be_statically_bound();
   } else {
     // Have to use a conservative value in this case.
     _can_be_statically_bound = false;
   }
   // Adjust the definition of this condition to be more useful:
   // %%% take these conditions into account in vtable generation
   if (!_can_be_statically_bound && h_m()->is_private())
     _can_be_statically_bound = true;
   if (_can_be_statically_bound && h_m()->is_abstract())
     _can_be_statically_bound = false;
   // generating _signature may allow GC and therefore move m.
   // These fields are always filled in.
   _name = env->get_symbol(h_m()->name());
   _holder = env->get_instance_klass(h_m()->method_holder());
   ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
   constantPoolHandle cpool = h_m()->constants();
   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
   _method_data = NULL;
   // Take a snapshot of these values, so they will be commensurate with the MDO.
   if (ProfileInterpreter || TieredCompilation) {
     int invcnt = h_m()->interpreter_invocation_count();
     // if the value overflowed report it as max int
     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();
   } else {
     _interpreter_invocation_count = 0;
     _interpreter_throwout_count = 0;
   }
   if (_interpreter_invocation_count == 0)
     _interpreter_invocation_count = 1;
   _instructions_size = -1;
 #ifdef ASSERT
   if (ReplayCompiles) {
     ciReplay::initialize(this);
   }
 #endif
 }
 // ------------------------------------------------------------------
 // ciMethod::ciMethod
 //
 // Unloaded method.
 ciMethod::ciMethod(ciInstanceKlass* holder,
                    ciSymbol*        name,
                    ciSymbol*        signature,
                    ciInstanceKlass* accessor) :
   ciMetadata((Metadata*)NULL),
   _name(                   name),
   _holder(                 holder),
   _intrinsic_id(           vmIntrinsics::_none),
   _liveness(               NULL),
   _can_be_statically_bound(false),
   _method_blocks(          NULL),
   _method_data(            NULL)
 #if defined(COMPILER2) || defined(SHARK)
   ,
   _flow(                   NULL),
   _bcea(                   NULL),
   _instructions_size(-1)
 #endif // COMPILER2 || SHARK
 {
   // Usually holder and accessor are the same type but in some cases
   // the holder has the wrong class loader (e.g. invokedynamic call
   // sites) so we pass the accessor.
   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 }
 // ------------------------------------------------------------------
 // ciMethod::load_code
 //
 // Load the bytecodes and exception handler table for this method.
 void ciMethod::load_code() {
   VM_ENTRY_MARK;
   assert(is_loaded(), "only loaded methods have code");
   Method* me = get_Method();
   Arena* arena = CURRENT_THREAD_ENV->arena();
   // Load the bytecodes.
   _code = (address)arena->Amalloc(code_size());
   memcpy(_code, me->code_base(), code_size());
   // Revert any breakpoint bytecodes in ci's copy
   if (me->number_of_breakpoints() > 0) {
     BreakpointInfo* bp = me->method_holder()->breakpoints();
     for (; bp != NULL; bp = bp->next()) {
       if (bp->match(me)) {
         code_at_put(bp->bci(), bp->orig_bytecode());
       }
     }
   }
   // And load the exception table.
   ExceptionTable exc_table(me);
   // Allocate one extra spot in our list of exceptions.  This
   // last entry will be used to represent the possibility that
   // an exception escapes the method.  See ciExceptionHandlerStream
   // for details.
   _exception_handlers =
     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
                                          * (_handler_count + 1));
   if (_handler_count > 0) {
     for (int i=0; i<_handler_count; i++) {
       _exception_handlers[i] = new (arena) ciExceptionHandler(
                                 holder(),
             /* start    */      exc_table.start_pc(i),
             /* limit    */      exc_table.end_pc(i),
             /* goto pc  */      exc_table.handler_pc(i),
             /* cp index */      exc_table.catch_type_index(i));
     }
   }
   // Put an entry at the end of our list to represent the possibility
   // of exceptional exit.
   _exception_handlers[_handler_count] =
     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
   if (CIPrintMethodCodes) {
     print_codes();
   }
 }
 // ------------------------------------------------------------------
 // ciMethod::has_linenumber_table
 //
 // length unknown until decompression
 bool    ciMethod::has_linenumber_table() const {
   check_is_loaded();
   VM_ENTRY_MARK;
   return get_Method()->has_linenumber_table();
 }
 // ------------------------------------------------------------------
 // ciMethod::compressed_linenumber_table
 u_char* ciMethod::compressed_linenumber_table() const {
   check_is_loaded();
   VM_ENTRY_MARK;
   return get_Method()->compressed_linenumber_table();
 }
 // ------------------------------------------------------------------
 // ciMethod::line_number_from_bci
 int ciMethod::line_number_from_bci(int bci) const {
   check_is_loaded();
   VM_ENTRY_MARK;
   return get_Method()->line_number_from_bci(bci);
 }
 // ------------------------------------------------------------------
 // ciMethod::vtable_index
 //
 // Get the position of this method's entry in the vtable, if any.
 int ciMethod::vtable_index() {
   check_is_loaded();
   assert(holder()->is_linked(), "must be linked");
   VM_ENTRY_MARK;
   return get_Method()->vtable_index();
 }
 #ifdef SHARK
 // ------------------------------------------------------------------
 // ciMethod::itable_index
 //
 // Get the position of this method's entry in the itable, if any.
 int ciMethod::itable_index() {
   check_is_loaded();
   assert(holder()->is_linked(), "must be linked");
   VM_ENTRY_MARK;
   Method* m = get_Method();
   if (!m->has_itable_index())
     return Method::nonvirtual_vtable_index;
   return m->itable_index();
 }
 #endif // SHARK
 // ------------------------------------------------------------------
 // ciMethod::native_entry
 //
 // Get the address of this method's native code, if any.
 address ciMethod::native_entry() {
   check_is_loaded();
   assert(flags().is_native(), "must be native method");
   VM_ENTRY_MARK;
   Method* method = get_Method();
   address entry = method->native_function();
   assert(entry != NULL, "must be valid entry point");
   return entry;
 }
 // ------------------------------------------------------------------
 // ciMethod::interpreter_entry
 //
 // Get the entry point for running this method in the interpreter.
 address ciMethod::interpreter_entry() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return Interpreter::entry_for_method(mh);
 }
 // ------------------------------------------------------------------
 // ciMethod::uses_balanced_monitors
 //
 // Does this method use monitors in a strict stack-disciplined manner?
 bool ciMethod::has_balanced_monitors() {
   check_is_loaded();
   if (_balanced_monitors) return true;
   // Analyze the method to see if monitors are used properly.
   VM_ENTRY_MARK;
   methodHandle method(THREAD, get_Method());
   assert(method->has_monitor_bytecodes(), "should have checked this");
   // Check to see if a previous compilation computed the
   // monitor-matching analysis.
   if (method->guaranteed_monitor_matching()) {
     _balanced_monitors = true;
     return true;
   }
   {
     EXCEPTION_MARK;
     ResourceMark rm(THREAD);
     GeneratePairingInfo gpi(method);
     gpi.compute_map(CATCH);
     if (!gpi.monitor_safe()) {
       return false;
     }
     method->set_guaranteed_monitor_matching();
     _balanced_monitors = true;
   }
   return true;
 }
 // ------------------------------------------------------------------
 // ciMethod::get_flow_analysis
 ciTypeFlow* ciMethod::get_flow_analysis() {
 #if defined(COMPILER2) || defined(SHARK)
   if (_flow == NULL) {
     ciEnv* env = CURRENT_ENV;
     _flow = new (env->arena()) ciTypeFlow(env, this);
     _flow->do_flow();
   }
   return _flow;
 #else // COMPILER2 || SHARK
   ShouldNotReachHere();
   return NULL;
 #endif // COMPILER2 || SHARK
 }
 // ------------------------------------------------------------------
 // ciMethod::get_osr_flow_analysis
 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 #if defined(COMPILER2) || defined(SHARK)
   // OSR entry points are always place after a call bytecode of some sort
   assert(osr_bci >= 0, "must supply valid OSR entry point");
   ciEnv* env = CURRENT_ENV;
   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
   flow->do_flow();
   return flow;
 #else // COMPILER2 || SHARK
   ShouldNotReachHere();
   return NULL;
 #endif // COMPILER2 || SHARK
 }
 // ------------------------------------------------------------------
 // ciMethod::raw_liveness_at_bci
 //
 // Which local variables are live at a specific bci?
 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
   check_is_loaded();
   if (_liveness == NULL) {
     // Create the liveness analyzer.
     Arena* arena = CURRENT_ENV->arena();
     _liveness = new (arena) MethodLiveness(arena, this);
     _liveness->compute_liveness();
   }
   return _liveness->get_liveness_at(bci);
 }
 // ------------------------------------------------------------------
 // ciMethod::liveness_at_bci
 //
 // Which local variables are live at a specific bci?  When debugging
 // will return true for all locals in some cases to improve debug
 // information.
 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
   MethodLivenessResult result = raw_liveness_at_bci(bci);
   if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {
     // Keep all locals live for the user's edification and amusement.
     result.at_put_range(0, result.size(), true);
   }
   return result;
 }
 // ciMethod::live_local_oops_at_bci
 //
 // find all the live oops in the locals array for a particular bci
 // Compute what the interpreter believes by using the interpreter
 // oopmap generator. This is used as a double check during osr to
 // guard against conservative result from MethodLiveness making us
 // think a dead oop is live.  MethodLiveness is conservative in the
 // sense that it may consider locals to be live which cannot be live,
 // like in the case where a local could contain an oop or  a primitive
 // along different paths.  In that case the local must be dead when
 // those paths merge. Since the interpreter's viewpoint is used when
 // gc'ing an interpreter frame we need to use its viewpoint  during
 // OSR when loading the locals.
 BitMap ciMethod::live_local_oops_at_bci(int bci) {
   VM_ENTRY_MARK;
   InterpreterOopMap mask;
   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
   int mask_size = max_locals();
   BitMap result(mask_size);
   result.clear();
   int i;
   for (i = 0; i < mask_size ; i++ ) {
     if (mask.is_oop(i)) result.set_bit(i);
   }
   return result;
 }
 #ifdef COMPILER1
 // ------------------------------------------------------------------
 // ciMethod::bci_block_start
 //
 // Marks all bcis where a new basic block starts
 const BitMap ciMethod::bci_block_start() {
   check_is_loaded();
   if (_liveness == NULL) {
     // Create the liveness analyzer.
     Arena* arena = CURRENT_ENV->arena();
     _liveness = new (arena) MethodLiveness(arena, this);
     _liveness->compute_liveness();
   }
   return _liveness->get_bci_block_start();
 }
 #endif // COMPILER1
 // ------------------------------------------------------------------
 // ciMethod::call_profile_at_bci
 //
 // Get the ciCallProfile for the invocation of this method.
 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
   ResourceMark rm;
   ciCallProfile result;
   if (method_data() != NULL && method_data()->is_mature()) {
     ciProfileData* data = method_data()->bci_to_data(bci);
     if (data != NULL && data->is_CounterData()) {
       // Every profiled call site has a counter.
       int count = data->as_CounterData()->count();
       if (!data->is_ReceiverTypeData()) {
         result._receiver_count[0] = 0;  // that's a definite zero
       } else { // ReceiverTypeData is a subclass of CounterData
         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
         // In addition, virtual call sites have receiver type information
         int receivers_count_total = 0;
         int morphism = 0;
         // Precompute morphism for the possible fixup
         for (uint i = 0; i < call->row_limit(); i++) {
           ciKlass* receiver = call->receiver(i);
           if (receiver == NULL)  continue;
           morphism++;
         }
         int epsilon = 0;
         if (TieredCompilation && ProfileInterpreter) {
           // Interpreter and C1 treat final and special invokes differently.
           // C1 will record a type, whereas the interpreter will just
           // increment the count. Detect this case.
           if (morphism == 1 && count > 0) {
             epsilon = count;
             count = 0;
           }
         }
         for (uint i = 0; i < call->row_limit(); i++) {
           ciKlass* receiver = call->receiver(i);
           if (receiver == NULL)  continue;
           int rcount = call->receiver_count(i) + epsilon;
           if (rcount == 0) rcount = 1; // Should be valid value
           receivers_count_total += rcount;
           // Add the receiver to result data.
           result.add_receiver(receiver, rcount);
           // If we extend profiling to record methods,
           // we will set result._method also.
         }
         // Determine call site's morphism.
         // The call site count is 0 with known morphism (onlt 1 or 2 receivers)
         // or < 0 in the case of a type check failured for checkcast, aastore, instanceof.
         // The call site count is > 0 in the case of a polymorphic virtual call.
         if (morphism > 0 && morphism == result._limit) {
            // The morphism <= MorphismLimit.
            if ((morphism <  ciCallProfile::MorphismLimit) ||
                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 #ifdef ASSERT
              if (count > 0) {
                this->print_short_name(tty);
                tty->print_cr(" @ bci:%d", bci);
                this->print_codes();
                assert(false, "this call site should not be polymorphic");
              }
 #endif
              result._morphism = morphism;
            }
         }
         // Make the count consistent if this is a call profile. If count is
         // zero or less, presume that this is a typecheck profile and
         // do nothing.  Otherwise, increase count to be the sum of all
         // receiver's counts.
         if (count >= 0) {
           count += receivers_count_total;
         }
       }
       result._count = count;
     }
   }
   return result;
 }
 // ------------------------------------------------------------------
 // Add new receiver and sort data by receiver's profile count.
 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
   // Add new receiver and sort data by receiver's counts when we have space
   // for it otherwise replace the less called receiver (less called receiver
   // is placed to the last array element which is not used).
   // First array's element contains most called receiver.
   int i = _limit;
   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
     _receiver[i] = _receiver[i-1];
     _receiver_count[i] = _receiver_count[i-1];
   }
   _receiver[i] = receiver;
   _receiver_count[i] = receiver_count;
   if (_limit < MorphismLimit) _limit++;
 }
 // ------------------------------------------------------------------
 // ciMethod::find_monomorphic_target
 //
 // Given a certain calling environment, find the monomorphic target
 // for the call.  Return NULL if the call is not monomorphic in
 // its calling environment, or if there are only abstract methods.
 // The returned method is never abstract.
 // Note: If caller uses a non-null result, it must inform dependencies
 // via assert_unique_concrete_method or assert_leaf_type.
 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
                                             ciInstanceKlass* callee_holder,
                                             ciInstanceKlass* actual_recv) {
   check_is_loaded();
   if (actual_recv->is_interface()) {
     // %%% We cannot trust interface types, yet.  See bug 6312651.
     return NULL;
   }
   ciMethod* root_m = resolve_invoke(caller, actual_recv);
   if (root_m == NULL) {
     // Something went wrong looking up the actual receiver method.
     return NULL;
   }
   assert(!root_m->is_abstract(), "resolve_invoke promise");
   // Make certain quick checks even if UseCHA is false.
   // Is it private or final?
   if (root_m->can_be_statically_bound()) {
     return root_m;
   }
   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
     // Easy case.  There is no other place to put a method, so don't bother
     // to go through the VM_ENTRY_MARK and all the rest.
     return root_m;
   }
   // Array methods (clone, hashCode, etc.) are always statically bound.
   // If we were to see an array type here, we'd return root_m.
   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
   // The inline_native_clone intrinsic narrows Object to T[] properly,
   // so there is no need to do the same job here.
   if (!UseCHA)  return NULL;
   VM_ENTRY_MARK;
   methodHandle target;
   {
     MutexLocker locker(Compile_lock);
     Klass* context = actual_recv->get_Klass();
     target = Dependencies::find_unique_concrete_method(context,
                                                        root_m->get_Method());
     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
   }
 #ifndef PRODUCT
   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
     tty->print("found a non-root unique target method");
     tty->print_cr("  context = %s", InstanceKlass::cast(actual_recv->get_Klass())->external_name());
     tty->print("  method  = ");
     target->print_short_name(tty);
     tty->cr();
   }
 #endif //PRODUCT
   if (target() == NULL) {
     return NULL;
   }
   if (target() == root_m->get_Method()) {
     return root_m;
   }
   if (!root_m->is_public() &&
       !root_m->is_protected()) {
     // If we are going to reason about inheritance, it's easiest
     // if the method in question is public, protected, or private.
     // If the answer is not root_m, it is conservatively correct
     // to return NULL, even if the CHA encountered irrelevant
     // methods in other packages.
     // %%% TO DO: Work out logic for package-private methods
     // with the same name but different vtable indexes.
     return NULL;
   }
   return CURRENT_THREAD_ENV->get_method(target());
 }
 // ------------------------------------------------------------------
 // ciMethod::resolve_invoke
 //
 // Given a known receiver klass, find the target for the call.
 // Return NULL if the call has no target or the target is abstract.
 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {
    check_is_loaded();
    VM_ENTRY_MARK;
    KlassHandle caller_klass (THREAD, caller->get_Klass());
    KlassHandle h_recv       (THREAD, exact_receiver->get_Klass());
    KlassHandle h_resolved   (THREAD, holder()->get_Klass());
    Symbol* h_name      = name()->get_symbol();
    Symbol* h_signature = signature()->get_symbol();
    methodHandle m;
    // Only do exact lookup if receiver klass has been linked.  Otherwise,
    // the vtable has not been setup, and the LinkResolver will fail.
    if (h_recv->oop_is_array()
         ||
        InstanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {
      if (holder()->is_interface()) {
        m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
      } else {
        m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);
      }
    }
    if (m.is_null()) {
      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
      return NULL;
    }
    ciMethod* result = this;
    if (m() != get_Method()) {
      result = CURRENT_THREAD_ENV->get_method(m());
    }
    // Don't return abstract methods because they aren't
    // optimizable or interesting.
    if (result->is_abstract()) {
      return NULL;
    } else {
      return result;
    }
 }
 // ------------------------------------------------------------------
 // ciMethod::resolve_vtable_index
 //
 // Given a known receiver klass, find the vtable index for the call.
 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
    check_is_loaded();
    int vtable_index = Method::invalid_vtable_index;
    // Only do lookup if receiver klass has been linked.  Otherwise,
    // the vtable has not been setup, and the LinkResolver will fail.
    if (!receiver->is_interface()
        && (!receiver->is_instance_klass() ||
            receiver->as_instance_klass()->is_linked())) {
      VM_ENTRY_MARK;
      KlassHandle caller_klass (THREAD, caller->get_Klass());
      KlassHandle h_recv       (THREAD, receiver->get_Klass());
      Symbol* h_name = name()->get_symbol();
      Symbol* h_signature = signature()->get_symbol();
      vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);
      if (vtable_index == Method::nonvirtual_vtable_index) {
        // A statically bound method.  Return "no such index".
        vtable_index = Method::invalid_vtable_index;
      }
    }
    return vtable_index;
 }
 // ------------------------------------------------------------------
 // ciMethod::interpreter_call_site_count
 int ciMethod::interpreter_call_site_count(int bci) {
   if (method_data() != NULL) {
     ResourceMark rm;
     ciProfileData* data = method_data()->bci_to_data(bci);
     if (data != NULL && data->is_CounterData()) {
       return scale_count(data->as_CounterData()->count());
     }
   }
   return -1;  // unknown
 }
 // ------------------------------------------------------------------
 // ciMethod::get_field_at_bci
 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
   ciBytecodeStream iter(this);
   iter.reset_to_bci(bci);
   iter.next();
   return iter.get_field(will_link);
 }
 // ------------------------------------------------------------------
 // ciMethod::get_method_at_bci
 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
   ciBytecodeStream iter(this);
   iter.reset_to_bci(bci);
   iter.next();
   return iter.get_method(will_link, declared_signature);
 }
 // ------------------------------------------------------------------
 // Adjust a CounterData count to be commensurate with
 // interpreter_invocation_count.  If the MDO exists for
 // only 25% of the time the method exists, then the
 // counts in the MDO should be scaled by 4X, so that
 // they can be usefully and stably compared against the
 // invocation counts in methods.
 int ciMethod::scale_count(int count, float prof_factor) {
   if (count > 0 && method_data() != NULL) {
     int counter_life;
     int method_life = interpreter_invocation_count();
     if (TieredCompilation) {
       // In tiered the MDO's life is measured directly, so just use the snapshotted counters
       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
     } else {
       int current_mileage = method_data()->current_mileage();
       int creation_mileage = method_data()->creation_mileage();
       counter_life = current_mileage - creation_mileage;
     }
     // counter_life due to backedge_counter could be > method_life
     if (counter_life > method_life)
       counter_life = method_life;
     if (0 < counter_life && counter_life <= method_life) {
       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
       count = (count > 0) ? count : 1;
     }
   }
   return count;
 }
 // ------------------------------------------------------------------
 // ciMethod::is_special_get_caller_class_method
 //
 bool ciMethod::is_ignored_by_security_stack_walk() const {
   check_is_loaded();
   VM_ENTRY_MARK;
   return get_Method()->is_ignored_by_security_stack_walk();
 }
 // ------------------------------------------------------------------
 // invokedynamic support
 // ------------------------------------------------------------------
 // ciMethod::is_method_handle_intrinsic
 //
 // Return true if the method is an instance of the JVM-generated
 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 bool ciMethod::is_method_handle_intrinsic() const {
   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
   return (MethodHandles::is_signature_polymorphic(iid) &&
           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 }
 // ------------------------------------------------------------------
 // ciMethod::is_compiled_lambda_form
 //
 // Return true if the method is a generated MethodHandle adapter.
 // These are built by Java code.
 bool ciMethod::is_compiled_lambda_form() const {
   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
   return iid == vmIntrinsics::_compiledLambdaForm;
 }
 // ------------------------------------------------------------------
 // ciMethod::has_member_arg
 //
 // Return true if the method is a linker intrinsic like _linkToVirtual.
 // These are built by the JVM.
 bool ciMethod::has_member_arg() const {
   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
   return (MethodHandles::is_signature_polymorphic(iid) &&
           MethodHandles::has_member_arg(iid));
 }
 // ------------------------------------------------------------------
 // ciMethod::ensure_method_data
 //
 // Generate new MethodData* objects at compile time.
 // Return true if allocation was successful or no MDO is required.
 bool ciMethod::ensure_method_data(methodHandle h_m) {
   EXCEPTION_CONTEXT;
   if (is_native() || is_abstract() || h_m()->is_accessor()) return true;
   if (h_m()->method_data() == NULL) {
     Method::build_interpreter_method_data(h_m, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
     }
   }
   if (h_m()->method_data() != NULL) {
     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
     _method_data->load_data();
     return true;
   } else {
     _method_data = CURRENT_ENV->get_empty_methodData();
     return false;
   }
 }
 // public, retroactive version
 bool ciMethod::ensure_method_data() {
   bool result = true;
   if (_method_data == NULL || _method_data->is_empty()) {
     GUARDED_VM_ENTRY({
       result = ensure_method_data(get_Method());
     });
   }
   return result;
 }
 // ------------------------------------------------------------------
 // ciMethod::method_data
 //
 ciMethodData* ciMethod::method_data() {
   if (_method_data != NULL) {
     return _method_data;
   }
   VM_ENTRY_MARK;
   ciEnv* env = CURRENT_ENV;
   Thread* my_thread = JavaThread::current();
   methodHandle h_m(my_thread, get_Method());
   if (h_m()->method_data() != NULL) {
     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
     _method_data->load_data();
   } else {
     _method_data = CURRENT_ENV->get_empty_methodData();
   }
   return _method_data;
 }
 // ------------------------------------------------------------------
 // ciMethod::method_data_or_null
 // Returns a pointer to ciMethodData if MDO exists on the VM side,
 // NULL otherwise.
 ciMethodData* ciMethod::method_data_or_null() {
   ciMethodData *md = method_data();
   if (md->is_empty()) return NULL;
   return md;
 }
 // ------------------------------------------------------------------
 // ciMethod::ensure_method_counters
 //
 address ciMethod::ensure_method_counters() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   MethodCounters *counter = mh->method_counters();
   if (counter == NULL) {
     counter = Method::build_method_counters(mh(), CHECK_AND_CLEAR_NULL);
   }
   return (address)counter;
 }
 // ------------------------------------------------------------------
 // ciMethod::should_exclude
 //
 // Should this method be excluded from compilation?
 bool ciMethod::should_exclude() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   bool ignore;
   return CompilerOracle::should_exclude(mh, ignore);
 }
 // ------------------------------------------------------------------
 // ciMethod::should_inline
 //
 // Should this method be inlined during compilation?
 bool ciMethod::should_inline() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return CompilerOracle::should_inline(mh);
 }
 // ------------------------------------------------------------------
 // ciMethod::should_not_inline
 //
 // Should this method be disallowed from inlining during compilation?
 bool ciMethod::should_not_inline() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return CompilerOracle::should_not_inline(mh);
 }
 // ------------------------------------------------------------------
 // ciMethod::should_print_assembly
 //
 // Should the compiler print the generated code for this method?
 bool ciMethod::should_print_assembly() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return CompilerOracle::should_print(mh);
 }
 // ------------------------------------------------------------------
 // ciMethod::break_at_execute
 //
 // Should the compiler insert a breakpoint into the generated code
 // method?
 bool ciMethod::break_at_execute() {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return CompilerOracle::should_break_at(mh);
 }
 // ------------------------------------------------------------------
 // ciMethod::has_option
 //
 bool ciMethod::has_option(const char* option) {
   check_is_loaded();
   VM_ENTRY_MARK;
   methodHandle mh(THREAD, get_Method());
   return CompilerOracle::has_option_string(mh, option);
 }
 // ------------------------------------------------------------------
 // ciMethod::can_be_compiled
 //
 // Have previous compilations of this method succeeded?
 bool ciMethod::can_be_compiled() {
   check_is_loaded();
   ciEnv* env = CURRENT_ENV;
   if (is_c1_compile(env->comp_level())) {
     return _is_c1_compilable;
   }
   return _is_c2_compilable;
 }
 // ------------------------------------------------------------------
 // ciMethod::set_not_compilable
 //
 // Tell the VM that this method cannot be compiled at all.
 void ciMethod::set_not_compilable(const char* reason) {
   check_is_loaded();
   VM_ENTRY_MARK;
   ciEnv* env = CURRENT_ENV;
   if (is_c1_compile(env->comp_level())) {
     _is_c1_compilable = false;
   } else {
     _is_c2_compilable = false;
   }
   get_Method()->set_not_compilable(env->comp_level(), true, reason);
 }
 // ------------------------------------------------------------------
 // ciMethod::can_be_osr_compiled
 //
 // Have previous compilations of this method succeeded?
 //
 // Implementation note: the VM does not currently keep track
 // of failed OSR compilations per bci.  The entry_bci parameter
 // is currently unused.
 bool ciMethod::can_be_osr_compiled(int entry_bci) {
   check_is_loaded();
   VM_ENTRY_MARK;
   ciEnv* env = CURRENT_ENV;
   return !get_Method()->is_not_osr_compilable(env->comp_level());
 }
 // ------------------------------------------------------------------
 // ciMethod::has_compiled_code
 bool ciMethod::has_compiled_code() {
   return instructions_size() > 0;
 }
 int ciMethod::comp_level() {
   check_is_loaded();
   VM_ENTRY_MARK;
   nmethod* nm = get_Method()->code();
   if (nm != NULL) return nm->comp_level();
   return 0;
 }
 int ciMethod::highest_osr_comp_level() {
   check_is_loaded();
   VM_ENTRY_MARK;
   return get_Method()->highest_osr_comp_level();
 }
 // ------------------------------------------------------------------
 // ciMethod::code_size_for_inlining
 //
 // Code size for inlining decisions.  This method returns a code
 // size of 1 for methods which has the ForceInline annotation.
 int ciMethod::code_size_for_inlining() {
   check_is_loaded();
   if (get_Method()->force_inline()) {
     return 1;
   }
   return code_size();
 }
 // ------------------------------------------------------------------
 // ciMethod::instructions_size
 //
 // This is a rough metric for "fat" methods, compared before inlining
 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
 // junk like exception handler, stubs, and constant table, which are
 // not highly relevant to an inlined method.  So we use the more
 // specific accessor nmethod::insts_size.
 int ciMethod::instructions_size() {
   if (_instructions_size == -1) {
     GUARDED_VM_ENTRY(
                      nmethod* code = get_Method()->code();
                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
                        _instructions_size = code->insts_end() - code->verified_entry_point();
                      } else {
                        _instructions_size = 0;
                      }
                      );
   }
   return _instructions_size;
 }
 // ------------------------------------------------------------------
 // ciMethod::log_nmethod_identity
 void ciMethod::log_nmethod_identity(xmlStream* log) {
   GUARDED_VM_ENTRY(
     nmethod* code = get_Method()->code();
     if (code != NULL) {
       code->log_identity(log);
     }
   )
 }
 // ------------------------------------------------------------------
 // ciMethod::is_not_reached
 bool ciMethod::is_not_reached(int bci) {
   check_is_loaded();
   VM_ENTRY_MARK;
   return Interpreter::is_not_reached(
                methodHandle(THREAD, get_Method()), bci);
 }
 // ------------------------------------------------------------------
 // ciMethod::was_never_executed
 bool ciMethod::was_executed_more_than(int times) {
   VM_ENTRY_MARK;
   return get_Method()->was_executed_more_than(times);
 }
 // ------------------------------------------------------------------
 // ciMethod::has_unloaded_classes_in_signature
 bool ciMethod::has_unloaded_classes_in_signature() {
   VM_ENTRY_MARK;
   {
     EXCEPTION_MARK;
     methodHandle m(THREAD, get_Method());
     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
     if( HAS_PENDING_EXCEPTION ) {
       CLEAR_PENDING_EXCEPTION;
       return true;     // Declare that we may have unloaded classes
     }
     return has_unloaded;
   }
 }
 // ------------------------------------------------------------------
 // ciMethod::is_klass_loaded
 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
   VM_ENTRY_MARK;
   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
 }
 // ------------------------------------------------------------------
 // ciMethod::check_call
 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
   // This method is used only in C2 from InlineTree::ok_to_inline,
   // and is only used under -Xcomp or -XX:CompileTheWorld.
   // It appears to fail when applied to an invokeinterface call site.
   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
   VM_ENTRY_MARK;
   {
     EXCEPTION_MARK;
     HandleMark hm(THREAD);
     constantPoolHandle pool (THREAD, get_Method()->constants());
     methodHandle spec_method;
     KlassHandle  spec_klass;
     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
     LinkResolver::resolve_method_statically(spec_method, spec_klass, code, pool, refinfo_index, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       return false;
     } else {
       return (spec_method->is_static() == is_static);
     }
   }
   return false;
 }
 // ------------------------------------------------------------------
 // ciMethod::print_codes
 //
 // Print the bytecodes for this method.
 void ciMethod::print_codes_on(outputStream* st) {
   check_is_loaded();
   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
 }
 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
   check_is_loaded(); \
   VM_ENTRY_MARK; \
   return get_Method()->flag_accessor(); \
 }
 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }
 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
 bool ciMethod::is_boxing_method() const {
   if (holder()->is_box_klass()) {
     switch (intrinsic_id()) {
       case vmIntrinsics::_Boolean_valueOf:
       case vmIntrinsics::_Byte_valueOf:
       case vmIntrinsics::_Character_valueOf:
       case vmIntrinsics::_Short_valueOf:
       case vmIntrinsics::_Integer_valueOf:
       case vmIntrinsics::_Long_valueOf:
       case vmIntrinsics::_Float_valueOf:
       case vmIntrinsics::_Double_valueOf:
         return true;
       default:
         return false;
     }
   }
   return false;
 }
 bool ciMethod::is_unboxing_method() const {
   if (holder()->is_box_klass()) {
     switch (intrinsic_id()) {
       case vmIntrinsics::_booleanValue:
       case vmIntrinsics::_byteValue:
       case vmIntrinsics::_charValue:
       case vmIntrinsics::_shortValue:
       case vmIntrinsics::_intValue:
       case vmIntrinsics::_longValue:
       case vmIntrinsics::_floatValue:
       case vmIntrinsics::_doubleValue:
         return true;
       default:
         return false;
     }
   }
   return false;
 }
 BCEscapeAnalyzer  *ciMethod::get_bcea() {
 #ifdef COMPILER2
   if (_bcea == NULL) {
     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
   }
   return _bcea;
 #else // COMPILER2
   ShouldNotReachHere();
   return NULL;
 #endif // COMPILER2
 }
 ciMethodBlocks  *ciMethod::get_method_blocks() {
   Arena *arena = CURRENT_ENV->arena();
   if (_method_blocks == NULL) {
     _method_blocks = new (arena) ciMethodBlocks(arena, this);
   }
   return _method_blocks;
 }
 #undef FETCH_FLAG_FROM_VM
 void ciMethod::dump_replay_data(outputStream* st) {
   ASSERT_IN_VM;
   ResourceMark rm;
   Method* method = get_Method();
   MethodCounters* mcs = method->method_counters();
   Klass*  holder = method->method_holder();
   st->print_cr("ciMethod %s %s %s %d %d %d %d %d",
                holder->name()->as_quoted_ascii(),
                method->name()->as_quoted_ascii(),
                method->signature()->as_quoted_ascii(),
                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
                interpreter_invocation_count(),
                interpreter_throwout_count(),
                _instructions_size);
 }
 // ------------------------------------------------------------------
 // ciMethod::print_codes
 //
 // Print a range of the bytecodes for this method.
 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
   check_is_loaded();
   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
 }
 // ------------------------------------------------------------------
 // ciMethod::print_name
 //
 // Print the name of this method, including signature and some flags.
 void ciMethod::print_name(outputStream* st) {
   check_is_loaded();
   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
 }
 // ------------------------------------------------------------------
 // ciMethod::print_short_name
 //
 // Print the name of this method, without signature.
 void ciMethod::print_short_name(outputStream* st) {
   if (is_loaded()) {
     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
   } else {
     // Fall back if method is not loaded.
     holder()->print_name_on(st);
     st->print("::");
     name()->print_symbol_on(st);
     if (WizardMode)
       signature()->as_symbol()->print_symbol_on(st);
   }
 }
 // ------------------------------------------------------------------
 // ciMethod::print_impl
 //
 // Implementation of the print method.
 void ciMethod::print_impl(outputStream* st) {
   ciMetadata::print_impl(st);
   st->print(" name=");
   name()->print_symbol_on(st);
   st->print(" holder=");
   holder()->print_name_on(st);
   st->print(" signature=");
   signature()->as_symbol()->print_symbol_on(st);
   if (is_loaded()) {
     st->print(" loaded=true");
     st->print(" arg_size=%d", arg_size());
     st->print(" flags=");
     flags().print_member_flags(st);
   } else {
     st->print(" loaded=false");
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciMethod.cpp@b2e698d2276c (annotated)

src/share/vm/ci/ciMethod.cpp