Mercurial > hg > truffle
diff src/share/vm/ci/ciMethod.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 1f530c629c7d |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/ci/ciMethod.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,1042 @@ +/* + * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_ciMethod.cpp.incl" + +// ciMethod +// +// This class represents a methodOop in the HotSpot virtual +// machine. + + +// ------------------------------------------------------------------ +// ciMethod::ciMethod +// +// Loaded method. +ciMethod::ciMethod(methodHandle h_m) : ciObject(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() / 4; + _uses_monitors = h_m()->access_flags().has_monitor_bytecodes(); + _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching(); + _is_compilable = !h_m()->is_not_compilable(); + // Lazy fields, filled in on demand. Require allocation. + _code = NULL; + _exception_handlers = NULL; + _liveness = NULL; + _bcea = NULL; + _method_blocks = NULL; +#ifdef COMPILER2 + _flow = NULL; +#endif // COMPILER2 + + if (JvmtiExport::can_hotswap_or_post_breakpoint() && _is_compilable) { + // 6328518 check hotswap conditions under the right lock. + MutexLocker locker(Compile_lock); + if (Dependencies::check_evol_method(h_m()) != NULL) { + _is_compilable = false; + } + } else { + CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); + } + + if (instanceKlass::cast(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; + + ciEnv *env = CURRENT_ENV; + // generating _signature may allow GC and therefore move m. + // These fields are always filled in. + _name = env->get_object(h_m()->name())->as_symbol(); + _holder = env->get_object(h_m()->method_holder())->as_instance_klass(); + ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol(); + _signature = new (env->arena()) ciSignature(_holder, sig_symbol); + _method_data = NULL; + // Take a snapshot of these values, so they will be commensurate with the MDO. + if (ProfileInterpreter) { + 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; +} + + +// ------------------------------------------------------------------ +// ciMethod::ciMethod +// +// Unloaded method. +ciMethod::ciMethod(ciInstanceKlass* holder, + ciSymbol* name, + ciSymbol* signature) : ciObject(ciMethodKlass::make()) { + // These fields are always filled in. + _name = name; + _holder = holder; + _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature); + _intrinsic_id = vmIntrinsics::_none; + _liveness = NULL; + _can_be_statically_bound = false; + _bcea = NULL; + _method_blocks = NULL; + _method_data = NULL; +#ifdef COMPILER2 + _flow = NULL; +#endif // COMPILER2 +} + + +// ------------------------------------------------------------------ +// 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"); + + methodOop me = get_methodOop(); + 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 (_is_compilable && me->number_of_breakpoints() > 0) { + BreakpointInfo* bp = instanceKlass::cast(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. + typeArrayOop exc_table = me->exception_table(); + + // 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++) { + int base = i*4; + _exception_handlers[i] = new (arena) ciExceptionHandler( + holder(), + /* start */ exc_table->int_at(base), + /* limit */ exc_table->int_at(base+1), + /* goto pc */ exc_table->int_at(base+2), + /* cp index */ exc_table->int_at(base+3)); + } + } + + // 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_methodOop()->has_linenumber_table(); +} + + +// ------------------------------------------------------------------ +// ciMethod::compressed_linenumber_table +u_char* ciMethod::compressed_linenumber_table() const { + check_is_loaded(); + VM_ENTRY_MARK; + return get_methodOop()->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_methodOop()->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_methodOop()->vtable_index(); +} + + +// ------------------------------------------------------------------ +// 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; + methodOop method = get_methodOop(); + 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_methodOop()); + 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_methodOop()); + 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() { +#ifdef COMPILER2 + if (_flow == NULL) { + ciEnv* env = CURRENT_ENV; + _flow = new (env->arena()) ciTypeFlow(env, this); + _flow->do_flow(); + } + return _flow; +#else // COMPILER2 + ShouldNotReachHere(); + return NULL; +#endif // COMPILER2 +} + + +// ------------------------------------------------------------------ +// ciMethod::get_osr_flow_analysis +ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) { +#ifdef COMPILER2 + // 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 + ShouldNotReachHere(); + return NULL; +#endif // COMPILER2 +} + +// ------------------------------------------------------------------ +// ciMethod::liveness_at_bci +// +// Which local variables are live at a specific bci? +MethodLivenessResult ciMethod::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(); + } + MethodLivenessResult result = _liveness->get_liveness_at(bci); + if (JvmtiExport::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_methodOop(), 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; + for (uint i = 0; i < call->row_limit(); i++) { + ciKlass* receiver = call->receiver(i); + if (receiver == NULL) continue; + morphism += 1; + int rcount = call->receiver_count(i); + 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 could be == (receivers_count_total + 1) + // not only in the case of a polymorphic call but also in the case + // when a method data snapshot is taken after the site count was updated + // but before receivers counters were updated. + if (morphism == result._limit) { + // There were no array klasses and morphism <= MorphismLimit. + if (morphism < ciCallProfile::MorphismLimit || + morphism == ciCallProfile::MorphismLimit && + (receivers_count_total+1) >= count) { + 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) { + if (count < receivers_count_total) { + 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); + klassOop context = actual_recv->get_klassOop(); + target = Dependencies::find_unique_concrete_method(context, + root_m->get_methodOop()); + // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. + } + +#ifndef PRODUCT + if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { + tty->print("found a non-root unique target method"); + tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); + tty->print(" method = "); + target->print_short_name(tty); + tty->cr(); + } +#endif //PRODUCT + + if (target() == NULL) { + return NULL; + } + if (target() == root_m->get_methodOop()) { + 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_object(target())->as_method(); +} + +// ------------------------------------------------------------------ +// 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_klassOop()); + KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); + KlassHandle h_resolved (THREAD, holder()->get_klassOop()); + symbolHandle h_name (THREAD, name()->get_symbolOop()); + symbolHandle h_signature (THREAD, signature()->get_symbolOop()); + + 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_javaArray() + || + 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_methodOop()) { + result = CURRENT_THREAD_ENV->get_object(m())->as_method(); + } + + // 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 methodOopDesc::invalid_vtable_index if the vtable_index is unknown. +int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { + check_is_loaded(); + + int vtable_index = methodOopDesc::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_klassOop()); + KlassHandle h_recv (THREAD, receiver->get_klassOop()); + symbolHandle h_name (THREAD, name()->get_symbolOop()); + symbolHandle h_signature (THREAD, signature()->get_symbolOop()); + + vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); + if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { + // A statically bound method. Return "no such index". + vtable_index = methodOopDesc::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 +} + +// ------------------------------------------------------------------ +// 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 current_mileage = method_data()->current_mileage(); + int creation_mileage = method_data()->creation_mileage(); + int counter_life = current_mileage - creation_mileage; + int method_life = interpreter_invocation_count(); + // 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::build_method_data +// +// Generate new methodDataOop objects at compile time. +void ciMethod::build_method_data(methodHandle h_m) { + EXCEPTION_CONTEXT; + if (is_native() || is_abstract() || h_m()->is_accessor()) return; + if (h_m()->method_data() == NULL) { + methodOopDesc::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_object(h_m()->method_data())->as_method_data(); + _method_data->load_data(); + } else { + _method_data = CURRENT_ENV->get_empty_methodData(); + } +} + +// public, retroactive version +void ciMethod::build_method_data() { + if (_method_data == NULL || _method_data->is_empty()) { + GUARDED_VM_ENTRY({ + build_method_data(get_methodOop()); + }); + } +} + + +// ------------------------------------------------------------------ +// 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_methodOop()); + + if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) { + build_method_data(h_m); + } + + if (h_m()->method_data() != NULL) { + _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); + _method_data->load_data(); + } else { + _method_data = CURRENT_ENV->get_empty_methodData(); + } + return _method_data; + +} + + +// ------------------------------------------------------------------ +// ciMethod::will_link +// +// Will this method link in a specific calling context? +bool ciMethod::will_link(ciKlass* accessing_klass, + ciKlass* declared_method_holder, + Bytecodes::Code bc) { + if (!is_loaded()) { + // Method lookup failed. + return false; + } + + // The link checks have been front-loaded into the get_method + // call. This method (ciMethod::will_link()) will be removed + // in the future. + + return true; +} + +// ------------------------------------------------------------------ +// ciMethod::should_exclude +// +// Should this method be excluded from compilation? +bool ciMethod::should_exclude() { + check_is_loaded(); + VM_ENTRY_MARK; + methodHandle mh(THREAD, get_methodOop()); + 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_methodOop()); + 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_methodOop()); + 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_methodOop()); + 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_methodOop()); + 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_methodOop()); + 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(); + return _is_compilable; +} + +// ------------------------------------------------------------------ +// ciMethod::set_not_compilable +// +// Tell the VM that this method cannot be compiled at all. +void ciMethod::set_not_compilable() { + check_is_loaded(); + VM_ENTRY_MARK; + _is_compilable = false; + get_methodOop()->set_not_compilable(); +} + +// ------------------------------------------------------------------ +// 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; + return !get_methodOop()->access_flags().is_not_osr_compilable(); +} + +// ------------------------------------------------------------------ +// ciMethod::has_compiled_code +bool ciMethod::has_compiled_code() { + VM_ENTRY_MARK; + return get_methodOop()->code() != NULL; +} + +// ------------------------------------------------------------------ +// ciMethod::instructions_size +// This is a rough metric for "fat" methods, compared +// before inlining with InlineSmallCode. +// The CodeBlob::instructions_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::code_size. +int ciMethod::instructions_size() { + GUARDED_VM_ENTRY( + nmethod* code = get_methodOop()->code(); + // if there's no compiled code or the code was produced by the + // tier1 profiler return 0 for the code size. This should + // probably be based on the compilation level of the nmethod but + // that currently isn't properly recorded. + if (code == NULL || + (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) { + return 0; + } + return code->code_size(); + ) +} + +// ------------------------------------------------------------------ +// ciMethod::log_nmethod_identity +void ciMethod::log_nmethod_identity(xmlStream* log) { + GUARDED_VM_ENTRY( + nmethod* code = get_methodOop()->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_methodOop()), bci); +} + +// ------------------------------------------------------------------ +// ciMethod::was_never_executed +bool ciMethod::was_executed_more_than(int times) { + VM_ENTRY_MARK; + return get_methodOop()->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_methodOop()); + bool has_unloaded = methodOopDesc::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_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); +} + +// ------------------------------------------------------------------ +// ciMethod::check_call +bool ciMethod::check_call(int refinfo_index, bool is_static) const { + VM_ENTRY_MARK; + { + EXCEPTION_MARK; + HandleMark hm(THREAD); + constantPoolHandle pool (THREAD, get_methodOop()->constants()); + methodHandle spec_method; + KlassHandle spec_klass; + LinkResolver::resolve_method(spec_method, spec_klass, 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_methodOop()->print_codes_on(st);) +} + + +#define FETCH_FLAG_FROM_VM(flag_accessor) { \ + check_is_loaded(); \ + VM_ENTRY_MARK; \ + return get_methodOop()->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); } + +BCEscapeAnalyzer *ciMethod::get_bcea() { + if (_bcea == NULL) { + _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); + } + return _bcea; +} + +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 + + +// ------------------------------------------------------------------ +// 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_methodOop()->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_methodOop()->print_name(st);) +} + +// ------------------------------------------------------------------ +// ciMethod::print_short_name +// +// Print the name of this method, without signature. +void ciMethod::print_short_name(outputStream* st) { + check_is_loaded(); + GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) +} + +// ------------------------------------------------------------------ +// ciMethod::print_impl +// +// Implementation of the print method. +void ciMethod::print_impl(outputStream* st) { + ciObject::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 flags="); + flags().print_member_flags(st); + } else { + st->print(" loaded=false"); + } +}