/* * 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++; } void ciMethod::assert_virtual_call_type_ok(int bci) { assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual || java_code_at_bci(bci) == Bytecodes::_invokeinterface, err_msg("unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)))); } void ciMethod::assert_call_type_ok(int bci) { assert(java_code_at_bci(bci) == Bytecodes::_invokestatic || java_code_at_bci(bci) == Bytecodes::_invokespecial || java_code_at_bci(bci) == Bytecodes::_invokedynamic, err_msg("unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)))); } /** * Check whether profiling provides a type for the argument i to the * call at bci bci * * @param bci bci of the call * @param i argument number * @return profiled type * * If the profile reports that the argument may be null, return false * at least for now. */ ciKlass* ciMethod::argument_profiled_type(int bci, int i) { if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) { ciProfileData* data = method_data()->bci_to_data(bci); if (data != NULL) { if (data->is_VirtualCallTypeData()) { assert_virtual_call_type_ok(bci); ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData(); if (i >= call->number_of_arguments()) { return NULL; } ciKlass* type = call->valid_argument_type(i); if (type != NULL && !call->argument_maybe_null(i)) { return type; } } else if (data->is_CallTypeData()) { assert_call_type_ok(bci); ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData(); if (i >= call->number_of_arguments()) { return NULL; } ciKlass* type = call->valid_argument_type(i); if (type != NULL && !call->argument_maybe_null(i)) { return type; } } } } return NULL; } /** * Check whether profiling provides a type for the return value from * the call at bci bci * * @param bci bci of the call * @return profiled type * * If the profile reports that the argument may be null, return false * at least for now. */ ciKlass* ciMethod::return_profiled_type(int bci) { if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) { ciProfileData* data = method_data()->bci_to_data(bci); if (data != NULL) { if (data->is_VirtualCallTypeData()) { assert_virtual_call_type_ok(bci); ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData(); ciKlass* type = call->valid_return_type(); if (type != NULL && !call->return_maybe_null()) { return type; } } else if (data->is_CallTypeData()) { assert_call_type_ok(bci); ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData(); ciKlass* type = call->valid_return_type(); if (type != NULL && !call->return_maybe_null()) { return type; } } } } return NULL; } /** * Check whether profiling provides a type for the parameter i * * @param i parameter number * @return profiled type * * If the profile reports that the argument may be null, return false * at least for now. */ ciKlass* ciMethod::parameter_profiled_type(int i) { if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) { ciParametersTypeData* parameters = method_data()->parameters_type_data(); if (parameters != NULL && i < parameters->number_of_parameters()) { ciKlass* type = parameters->valid_parameter_type(i); if (type != NULL && !parameters->parameter_maybe_null(i)) { return type; } } } return NULL; } // ------------------------------------------------------------------ // 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 // MethodCounters* ciMethod::ensure_method_counters() { check_is_loaded(); VM_ENTRY_MARK; methodHandle mh(THREAD, get_Method()); MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL); return method_counters; } // ------------------------------------------------------------------ // 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_name_as_ascii(outputStream* st) { Method* method = get_Method(); st->print("%s %s %s", method->klass_name()->as_quoted_ascii(), method->name()->as_quoted_ascii(), method->signature()->as_quoted_ascii()); } void ciMethod::dump_replay_data(outputStream* st) { ResourceMark rm; Method* method = get_Method(); MethodCounters* mcs = method->method_counters(); st->print("ciMethod "); dump_name_as_ascii(st); st->print_cr(" %d %d %d %d %d", 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"); } }