#ifdef USE_PRAGMA_IDENT_SRC #pragma ident "@(#)ciEnv.cpp 1.128 07/05/17 15:49:53 JVM" #endif /* * Copyright 1999-2008 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/_ciEnv.cpp.incl" // ciEnv // // This class is the top level broker for requests from the compiler // to the VM. ciObject* ciEnv::_null_object_instance; ciMethodKlass* ciEnv::_method_klass_instance; ciSymbolKlass* ciEnv::_symbol_klass_instance; ciKlassKlass* ciEnv::_klass_klass_instance; ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; ciInstanceKlass* ciEnv::_ArrayStoreException; ciInstanceKlass* ciEnv::_Class; ciInstanceKlass* ciEnv::_ClassCastException; ciInstanceKlass* ciEnv::_Object; ciInstanceKlass* ciEnv::_Throwable; ciInstanceKlass* ciEnv::_Thread; ciInstanceKlass* ciEnv::_OutOfMemoryError; ciInstanceKlass* ciEnv::_String; ciSymbol* ciEnv::_unloaded_cisymbol = NULL; ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; jobject ciEnv::_ArrayStoreException_handle = NULL; jobject ciEnv::_ClassCastException_handle = NULL; #ifndef PRODUCT static bool firstEnv = true; #endif /* PRODUCT */ // ------------------------------------------------------------------ // ciEnv::ciEnv ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { VM_ENTRY_MARK; // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. thread->set_env(this); assert(ciEnv::current() == this, "sanity"); _oop_recorder = NULL; _debug_info = NULL; _dependencies = NULL; _failure_reason = NULL; _compilable = MethodCompilable; _break_at_compile = false; _compiler_data = NULL; #ifndef PRODUCT assert(!firstEnv, "not initialized properly"); #endif /* !PRODUCT */ _system_dictionary_modification_counter = system_dictionary_modification_counter; _num_inlined_bytecodes = 0; assert(task == NULL || thread->task() == task, "sanity"); _task = task; _log = NULL; // Temporary buffer for creating symbols and such. _name_buffer = NULL; _name_buffer_len = 0; _arena = &_ciEnv_arena; _factory = new (_arena) ciObjectFactory(_arena, 128); // Preload commonly referenced system ciObjects. // During VM initialization, these instances have not yet been created. // Assertions ensure that these instances are not accessed before // their initialization. assert(Universe::is_fully_initialized(), "should be complete"); oop o = Universe::null_ptr_exception_instance(); assert(o != NULL, "should have been initialized"); _NullPointerException_instance = get_object(o)->as_instance(); o = Universe::arithmetic_exception_instance(); assert(o != NULL, "should have been initialized"); _ArithmeticException_instance = get_object(o)->as_instance(); _ArrayIndexOutOfBoundsException_instance = NULL; _ArrayStoreException_instance = NULL; _ClassCastException_instance = NULL; } ciEnv::ciEnv(Arena* arena) { ASSERT_IN_VM; // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. CompilerThread* current_thread = CompilerThread::current(); assert(current_thread->env() == NULL, "must be"); current_thread->set_env(this); assert(ciEnv::current() == this, "sanity"); _oop_recorder = NULL; _debug_info = NULL; _dependencies = NULL; _failure_reason = NULL; _compilable = MethodCompilable_never; _break_at_compile = false; _compiler_data = NULL; #ifndef PRODUCT assert(firstEnv, "must be first"); firstEnv = false; #endif /* !PRODUCT */ _system_dictionary_modification_counter = 0; _num_inlined_bytecodes = 0; _task = NULL; _log = NULL; // Temporary buffer for creating symbols and such. _name_buffer = NULL; _name_buffer_len = 0; _arena = arena; _factory = new (_arena) ciObjectFactory(_arena, 128); // Preload commonly referenced system ciObjects. // During VM initialization, these instances have not yet been created. // Assertions ensure that these instances are not accessed before // their initialization. assert(Universe::is_fully_initialized(), "must be"); oop o = Universe::null_ptr_exception_instance(); assert(o != NULL, "should have been initialized"); _NullPointerException_instance = get_object(o)->as_instance(); o = Universe::arithmetic_exception_instance(); assert(o != NULL, "should have been initialized"); _ArithmeticException_instance = get_object(o)->as_instance(); _ArrayIndexOutOfBoundsException_instance = NULL; _ArrayStoreException_instance = NULL; _ClassCastException_instance = NULL; } ciEnv::~ciEnv() { CompilerThread* current_thread = CompilerThread::current(); current_thread->set_env(NULL); } // ------------------------------------------------------------------ // helper for lazy exception creation ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { VM_ENTRY_MARK; if (handle == NULL) { // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); jobject objh = NULL; if (!HAS_PENDING_EXCEPTION && k != NULL) { oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); if (!HAS_PENDING_EXCEPTION) objh = JNIHandles::make_global(obj); } if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; } else { handle = objh; } } oop obj = JNIHandles::resolve(handle); return obj == NULL? NULL: get_object(obj)->as_instance(); } // ------------------------------------------------------------------ // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { if (_ArrayIndexOutOfBoundsException_instance == NULL) { _ArrayIndexOutOfBoundsException_instance = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); } return _ArrayIndexOutOfBoundsException_instance; } ciInstance* ciEnv::ArrayStoreException_instance() { if (_ArrayStoreException_instance == NULL) { _ArrayStoreException_instance = get_or_create_exception(_ArrayStoreException_handle, vmSymbolHandles::java_lang_ArrayStoreException()); } return _ArrayStoreException_instance; } ciInstance* ciEnv::ClassCastException_instance() { if (_ClassCastException_instance == NULL) { _ClassCastException_instance = get_or_create_exception(_ClassCastException_handle, vmSymbolHandles::java_lang_ClassCastException()); } return _ClassCastException_instance; } // ------------------------------------------------------------------ // ciEnv::get_method_from_handle ciMethod* ciEnv::get_method_from_handle(jobject method) { VM_ENTRY_MARK; return get_object(JNIHandles::resolve(method))->as_method(); } // ------------------------------------------------------------------ // ciEnv::make_array ciArray* ciEnv::make_array(GrowableArray* objects) { VM_ENTRY_MARK; int length = objects->length(); objArrayOop a = oopFactory::new_system_objArray(length, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; record_out_of_memory_failure(); return NULL; } for (int i = 0; i < length; i++) { a->obj_at_put(i, objects->at(i)->get_oop()); } assert(a->is_perm(), ""); return get_object(a)->as_array(); } // ------------------------------------------------------------------ // ciEnv::array_element_offset_in_bytes int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { VM_ENTRY_MARK; objArrayOop a = (objArrayOop)a_h->get_oop(); assert(a->is_objArray(), ""); int length = a->length(); oop o = o_h->get_oop(); for (int i = 0; i < length; i++) { if (a->obj_at(i) == o) return i; } return -1; } // ------------------------------------------------------------------ // ciEnv::check_klass_accessiblity // // Note: the logic of this method should mirror the logic of // constantPoolOopDesc::verify_constant_pool_resolve. bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, klassOop resolved_klass) { if (accessing_klass == NULL || !accessing_klass->is_loaded()) { return true; } if (accessing_klass->is_obj_array()) { accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); } if (!accessing_klass->is_instance_klass()) { return true; } if (resolved_klass->klass_part()->oop_is_objArray()) { // Find the element klass, if this is an array. resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); } if (resolved_klass->klass_part()->oop_is_instance()) { return Reflection::verify_class_access(accessing_klass->get_klassOop(), resolved_klass, true); } return true; } // ------------------------------------------------------------------ // ciEnv::get_klass_by_name_impl ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, ciSymbol* name, bool require_local) { ASSERT_IN_VM; EXCEPTION_CONTEXT; // Now we need to check the SystemDictionary symbolHandle sym(THREAD, name->get_symbolOop()); if (sym->byte_at(0) == 'L' && sym->byte_at(sym->utf8_length()-1) == ';') { // This is a name from a signature. Strip off the trimmings. sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, sym->utf8_length()-2, KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); name = get_object(sym())->as_symbol(); } // Check for prior unloaded klass. The SystemDictionary's answers // can vary over time but the compiler needs consistency. ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); if (unloaded_klass != NULL) { if (require_local) return NULL; return unloaded_klass; } Handle loader(THREAD, (oop)NULL); Handle domain(THREAD, (oop)NULL); if (accessing_klass != NULL) { loader = Handle(THREAD, accessing_klass->loader()); domain = Handle(THREAD, accessing_klass->protection_domain()); } // setup up the proper type to return on OOM ciKlass* fail_type; if (sym->byte_at(0) == '[') { fail_type = _unloaded_ciobjarrayklass; } else { fail_type = _unloaded_ciinstance_klass; } klassOop found_klass; if (!require_local) { found_klass = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, KILL_COMPILE_ON_FATAL_(fail_type)); } else { found_klass = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, KILL_COMPILE_ON_FATAL_(fail_type)); } if (found_klass != NULL) { // Found it. Build a CI handle. return get_object(found_klass)->as_klass(); } // If we fail to find an array klass, look again for its element type. // The element type may be available either locally or via constraints. // In either case, if we can find the element type in the system dictionary, // we must build an array type around it. The CI requires array klasses // to be loaded if their element klasses are loaded, except when memory // is exhausted. if (sym->byte_at(0) == '[' && (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { // We have an unloaded array. // Build it on the fly if the element class exists. symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, sym->utf8_length()-1, KILL_COMPILE_ON_FATAL_(fail_type)); // Get element ciKlass recursively. ciKlass* elem_klass = get_klass_by_name_impl(accessing_klass, get_object(elem_sym)->as_symbol(), require_local); if (elem_klass != NULL && elem_klass->is_loaded()) { // Now make an array for it return ciObjArrayKlass::make_impl(elem_klass); } } if (require_local) return NULL; // Not yet loaded into the VM, or not governed by loader constraints. // Make a CI representative for it. return get_unloaded_klass(accessing_klass, name); } // ------------------------------------------------------------------ // ciEnv::get_klass_by_name ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, ciSymbol* klass_name, bool require_local) { GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, klass_name, require_local);) } // ------------------------------------------------------------------ // ciEnv::get_klass_by_index_impl // // Implementation of get_klass_by_index. ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor, int index, bool& is_accessible) { assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); EXCEPTION_CONTEXT; constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants()); KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); symbolHandle klass_name; if (klass.is_null()) { // The klass has not been inserted into the constant pool. // Try to look it up by name. { // We have to lock the cpool to keep the oop from being resolved // while we are accessing it. ObjectLocker ol(cpool, THREAD); constantTag tag = cpool->tag_at(index); if (tag.is_klass()) { // The klass has been inserted into the constant pool // very recently. klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); } else if (tag.is_symbol()) { klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); } else { assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); } } } if (klass.is_null()) { // Not found in constant pool. Use the name to do the lookup. ciKlass* k = get_klass_by_name_impl(accessor, get_object(klass_name())->as_symbol(), false); // Calculate accessibility the hard way. if (!k->is_loaded()) { is_accessible = false; } else if (k->loader() != accessor->loader() && get_klass_by_name_impl(accessor, k->name(), true) == NULL) { // Loaded only remotely. Not linked yet. is_accessible = false; } else { // Linked locally, and we must also check public/private, etc. is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); } return k; } // Check for prior unloaded klass. The SystemDictionary's answers // can vary over time but the compiler needs consistency. ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); if (unloaded_klass != NULL) { is_accessible = false; return unloaded_klass; } // It is known to be accessible, since it was found in the constant pool. is_accessible = true; return get_object(klass())->as_klass(); } // ------------------------------------------------------------------ // ciEnv::get_klass_by_index // // Get a klass from the constant pool. ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor, int index, bool& is_accessible) { GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);) } // ------------------------------------------------------------------ // ciEnv::get_constant_by_index_impl // // Implementation of get_constant_by_index(). ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor, int index) { EXCEPTION_CONTEXT; instanceKlass* ik_accessor = accessor->get_instanceKlass(); assert(ik_accessor->is_linked(), "must be linked before accessing constant pool"); constantPoolOop cpool = ik_accessor->constants(); constantTag tag = cpool->tag_at(index); if (tag.is_int()) { return ciConstant(T_INT, (jint)cpool->int_at(index)); } else if (tag.is_long()) { return ciConstant((jlong)cpool->long_at(index)); } else if (tag.is_float()) { return ciConstant((jfloat)cpool->float_at(index)); } else if (tag.is_double()) { return ciConstant((jdouble)cpool->double_at(index)); } else if (tag.is_string() || tag.is_unresolved_string()) { oop string = NULL; if (cpool->is_pseudo_string_at(index)) { string = cpool->pseudo_string_at(index); } else { string = cpool->string_at(index, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; record_out_of_memory_failure(); return ciConstant(); } } ciObject* constant = get_object(string); assert (constant->is_instance(), "must be an instance, or not? "); return ciConstant(T_OBJECT, constant); } else if (tag.is_klass() || tag.is_unresolved_klass()) { // 4881222: allow ldc to take a class type bool ignore; ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; record_out_of_memory_failure(); return ciConstant(); } assert (klass->is_instance_klass() || klass->is_array_klass(), "must be an instance or array klass "); return ciConstant(T_OBJECT, klass); } else { ShouldNotReachHere(); return ciConstant(); } } // ------------------------------------------------------------------ // ciEnv::is_unresolved_string_impl // // Implementation of is_unresolved_string(). bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { EXCEPTION_CONTEXT; assert(accessor->is_linked(), "must be linked before accessing constant pool"); constantPoolOop cpool = accessor->constants(); constantTag tag = cpool->tag_at(index); return tag.is_unresolved_string(); } // ------------------------------------------------------------------ // ciEnv::is_unresolved_klass_impl // // Implementation of is_unresolved_klass(). bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { EXCEPTION_CONTEXT; assert(accessor->is_linked(), "must be linked before accessing constant pool"); constantPoolOop cpool = accessor->constants(); constantTag tag = cpool->tag_at(index); return tag.is_unresolved_klass(); } // ------------------------------------------------------------------ // ciEnv::get_constant_by_index // // Pull a constant out of the constant pool. How appropriate. // // Implementation note: this query is currently in no way cached. ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor, int index) { GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); ) } // ------------------------------------------------------------------ // ciEnv::is_unresolved_string // // Check constant pool // // Implementation note: this query is currently in no way cached. bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, int index) const { GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) } // ------------------------------------------------------------------ // ciEnv::is_unresolved_klass // // Check constant pool // // Implementation note: this query is currently in no way cached. bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, int index) const { GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) } // ------------------------------------------------------------------ // ciEnv::get_field_by_index_impl // // Implementation of get_field_by_index. // // Implementation note: the results of field lookups are cached // in the accessor klass. ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, int index) { ciConstantPoolCache* cache = accessor->field_cache(); if (cache == NULL) { ciField* field = new (arena()) ciField(accessor, index); return field; } else { ciField* field = (ciField*)cache->get(index); if (field == NULL) { field = new (arena()) ciField(accessor, index); cache->insert(index, field); } return field; } } // ------------------------------------------------------------------ // ciEnv::get_field_by_index // // Get a field by index from a klass's constant pool. ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, int index) { GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) } // ------------------------------------------------------------------ // ciEnv::lookup_method // // Perform an appropriate method lookup based on accessor, holder, // name, signature, and bytecode. methodOop ciEnv::lookup_method(instanceKlass* accessor, instanceKlass* holder, symbolOop name, symbolOop sig, Bytecodes::Code bc) { EXCEPTION_CONTEXT; KlassHandle h_accessor(THREAD, accessor); KlassHandle h_holder(THREAD, holder); symbolHandle h_name(THREAD, name); symbolHandle h_sig(THREAD, sig); LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); methodHandle dest_method; switch (bc) { case Bytecodes::_invokestatic: dest_method = LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); break; case Bytecodes::_invokespecial: dest_method = LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); break; case Bytecodes::_invokeinterface: dest_method = LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, h_accessor, true); break; case Bytecodes::_invokevirtual: dest_method = LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, h_accessor, true); break; default: ShouldNotReachHere(); } return dest_method(); } // ------------------------------------------------------------------ // ciEnv::get_method_by_index_impl ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor, int index, Bytecodes::Code bc) { // Get the method's declared holder. assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); constantPoolHandle cpool = accessor->get_instanceKlass()->constants(); int holder_index = cpool->klass_ref_index_at(index); bool holder_is_accessible; ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible); ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); // Get the method's name and signature. int nt_index = cpool->name_and_type_ref_index_at(index); int sig_index = cpool->signature_ref_index_at(nt_index); symbolOop name_sym = cpool->name_ref_at(index); symbolOop sig_sym = cpool->symbol_at(sig_index); if (holder_is_accessible) { // Our declared holder is loaded. instanceKlass* lookup = declared_holder->get_instanceKlass(); methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); if (m != NULL) { // We found the method. return get_object(m)->as_method(); } } // Either the declared holder was not loaded, or the method could // not be found. Create a dummy ciMethod to represent the failed // lookup. return get_unloaded_method(declared_holder, get_object(name_sym)->as_symbol(), get_object(sig_sym)->as_symbol()); } // ------------------------------------------------------------------ // ciEnv::get_instance_klass_for_declared_method_holder ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { // For the case of .clone(), the method holder can be a ciArrayKlass // instead of a ciInstanceKlass. For that case simply pretend that the // declared holder is Object.clone since that's where the call will bottom out. // A more correct fix would trickle out through many interfaces in CI, // requiring ciInstanceKlass* to become ciKlass* and many more places would // require checks to make sure the expected type was found. Given that this // only occurs for clone() the more extensive fix seems like overkill so // instead we simply smear the array type into Object. if (method_holder->is_instance_klass()) { return method_holder->as_instance_klass(); } else if (method_holder->is_array_klass()) { return current()->Object_klass(); } else { ShouldNotReachHere(); } return NULL; } // ------------------------------------------------------------------ // ciEnv::get_method_by_index ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor, int index, Bytecodes::Code bc) { GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);) } // ------------------------------------------------------------------ // ciEnv::name_buffer char *ciEnv::name_buffer(int req_len) { if (_name_buffer_len < req_len) { if (_name_buffer == NULL) { _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); _name_buffer_len = req_len; } else { _name_buffer = (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); _name_buffer_len = req_len; } } return _name_buffer; } // ------------------------------------------------------------------ // ciEnv::is_in_vm bool ciEnv::is_in_vm() { return JavaThread::current()->thread_state() == _thread_in_vm; } bool ciEnv::system_dictionary_modification_counter_changed() { return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); } // ------------------------------------------------------------------ // ciEnv::check_for_system_dictionary_modification // Check for changes to the system dictionary during compilation // class loads, evolution, breakpoints void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { if (failing()) return; // no need for further checks // Dependencies must be checked when the system dictionary changes. // If logging is enabled all violated dependences will be recorded in // the log. In debug mode check dependencies even if the system // dictionary hasn't changed to verify that no invalid dependencies // were inserted. Any violated dependences in this case are dumped to // the tty. bool counter_changed = system_dictionary_modification_counter_changed(); bool test_deps = counter_changed; DEBUG_ONLY(test_deps = true); if (!test_deps) return; bool print_failures = false; DEBUG_ONLY(print_failures = !counter_changed); bool keep_going = (print_failures || xtty != NULL); int violated = 0; for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { klassOop witness = deps.check_dependency(); if (witness != NULL) { ++violated; if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); // If there's no log and we're not sanity-checking, we're done. if (!keep_going) break; } } if (violated != 0) { assert(counter_changed, "failed dependencies, but counter didn't change"); record_failure("concurrent class loading"); } } // ------------------------------------------------------------------ // ciEnv::register_method void ciEnv::register_method(ciMethod* target, int entry_bci, CodeOffsets* offsets, int orig_pc_offset, CodeBuffer* code_buffer, int frame_words, OopMapSet* oop_map_set, ExceptionHandlerTable* handler_table, ImplicitExceptionTable* inc_table, AbstractCompiler* compiler, int comp_level, bool has_debug_info, bool has_unsafe_access) { VM_ENTRY_MARK; nmethod* nm = NULL; { // To prevent compile queue updates. MutexLocker locker(MethodCompileQueue_lock, THREAD); // Prevent SystemDictionary::add_to_hierarchy from running // and invalidating our dependencies until we install this method. MutexLocker ml(Compile_lock); if (log() != NULL) { // Log the dependencies which this compilation declares. dependencies()->log_all_dependencies(); } // Encode the dependencies now, so we can check them right away. dependencies()->encode_content_bytes(); // Check for {class loads, evolution, breakpoints} during compilation check_for_system_dictionary_modification(target); methodHandle method(THREAD, target->get_methodOop()); if (failing()) { // While not a true deoptimization, it is a preemptive decompile. methodDataOop mdo = method()->method_data(); if (mdo != NULL) { mdo->inc_decompile_count(); } // All buffers in the CodeBuffer are allocated in the CodeCache. // If the code buffer is created on each compile attempt // as in C2, then it must be freed. code_buffer->free_blob(); return; } assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); nm = nmethod::new_nmethod(method, compile_id(), entry_bci, offsets, orig_pc_offset, debug_info(), dependencies(), code_buffer, frame_words, oop_map_set, handler_table, inc_table, compiler, comp_level); // Free codeBlobs code_buffer->free_blob(); // stress test 6243940 by immediately making the method // non-entrant behind the system's back. This has serious // side effects on the code cache and is not meant for // general stress testing if (nm != NULL && StressNonEntrant) { MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), SharedRuntime::get_handle_wrong_method_stub()); } if (nm == NULL) { // The CodeCache is full. Print out warning and disable compilation. record_failure("code cache is full"); UseInterpreter = true; if (UseCompiler || AlwaysCompileLoopMethods ) { #ifndef PRODUCT warning("CodeCache is full. Compiler has been disabled"); if (CompileTheWorld || ExitOnFullCodeCache) { before_exit(JavaThread::current()); exit_globals(); // will delete tty vm_direct_exit(CompileTheWorld ? 0 : 1); } #endif UseCompiler = false; AlwaysCompileLoopMethods = false; } } else { NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) nm->set_has_unsafe_access(has_unsafe_access); // Record successful registration. // (Put nm into the task handle *before* publishing to the Java heap.) if (task() != NULL) task()->set_code(nm); if (entry_bci == InvocationEntryBci) { #ifdef TIERED // If there is an old version we're done with it nmethod* old = method->code(); if (TraceMethodReplacement && old != NULL) { ResourceMark rm; char *method_name = method->name_and_sig_as_C_string(); tty->print_cr("Replacing method %s", method_name); } if (old != NULL ) { old->make_not_entrant(); } #endif // TIERED if (TraceNMethodInstalls ) { ResourceMark rm; char *method_name = method->name_and_sig_as_C_string(); ttyLocker ttyl; tty->print_cr("Installing method (%d) %s ", comp_level, method_name); } // Allow the code to be executed method->set_code(method, nm); } else { if (TraceNMethodInstalls ) { ResourceMark rm; char *method_name = method->name_and_sig_as_C_string(); ttyLocker ttyl; tty->print_cr("Installing osr method (%d) %s @ %d", comp_level, method_name, entry_bci); } instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); } } } // JVMTI -- compiled method notification (must be done outside lock) if (nm != NULL) { nm->post_compiled_method_load_event(); } } // ------------------------------------------------------------------ // ciEnv::find_system_klass ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { VM_ENTRY_MARK; return get_klass_by_name_impl(NULL, klass_name, false); } // ------------------------------------------------------------------ // ciEnv::comp_level int ciEnv::comp_level() { if (task() == NULL) return CompLevel_full_optimization; return task()->comp_level(); } // ------------------------------------------------------------------ // ciEnv::compile_id uint ciEnv::compile_id() { if (task() == NULL) return 0; return task()->compile_id(); } // ------------------------------------------------------------------ // ciEnv::notice_inlined_method() void ciEnv::notice_inlined_method(ciMethod* method) { _num_inlined_bytecodes += method->code_size(); } // ------------------------------------------------------------------ // ciEnv::num_inlined_bytecodes() int ciEnv::num_inlined_bytecodes() const { return _num_inlined_bytecodes; } // ------------------------------------------------------------------ // ciEnv::record_failure() void ciEnv::record_failure(const char* reason) { if (log() != NULL) { log()->elem("failure reason='%s'", reason); } if (_failure_reason == NULL) { // Record the first failure reason. _failure_reason = reason; } } // ------------------------------------------------------------------ // ciEnv::record_method_not_compilable() void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { int new_compilable = all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; // Only note transitions to a worse state if (new_compilable > _compilable) { if (log() != NULL) { if (all_tiers) { log()->elem("method_not_compilable"); } else { log()->elem("method_not_compilable_at_tier"); } } _compilable = new_compilable; // Reset failure reason; this one is more important. _failure_reason = NULL; record_failure(reason); } } // ------------------------------------------------------------------ // ciEnv::record_out_of_memory_failure() void ciEnv::record_out_of_memory_failure() { // If memory is low, we stop compiling methods. record_method_not_compilable("out of memory"); }