/* * Copyright 1999-2009 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. * */ class CompileTask; // ciEnv // // This class is the top level broker for requests from the compiler // to the VM. class ciEnv : StackObj { CI_PACKAGE_ACCESS_TO friend class CompileBroker; friend class Dependencies; // for get_object, during logging private: Arena* _arena; // Alias for _ciEnv_arena except in init_shared_objects() Arena _ciEnv_arena; int _system_dictionary_modification_counter; ciObjectFactory* _factory; OopRecorder* _oop_recorder; DebugInformationRecorder* _debug_info; Dependencies* _dependencies; const char* _failure_reason; int _compilable; bool _break_at_compile; int _num_inlined_bytecodes; CompileTask* _task; // faster access to CompilerThread::task CompileLog* _log; // faster access to CompilerThread::log void* _compiler_data; // compiler-specific stuff, if any char* _name_buffer; int _name_buffer_len; // Cache Jvmti state bool _jvmti_can_hotswap_or_post_breakpoint; bool _jvmti_can_examine_or_deopt_anywhere; bool _jvmti_can_access_local_variables; bool _jvmti_can_post_exceptions; // Cache DTrace flags bool _dtrace_extended_probes; bool _dtrace_monitor_probes; bool _dtrace_method_probes; bool _dtrace_alloc_probes; // Distinguished instances of certain ciObjects.. static ciObject* _null_object_instance; static ciMethodKlass* _method_klass_instance; static ciSymbolKlass* _symbol_klass_instance; static ciKlassKlass* _klass_klass_instance; static ciInstanceKlassKlass* _instance_klass_klass_instance; static ciTypeArrayKlassKlass* _type_array_klass_klass_instance; static ciObjArrayKlassKlass* _obj_array_klass_klass_instance; static ciInstanceKlass* _ArrayStoreException; static ciInstanceKlass* _Class; static ciInstanceKlass* _ClassCastException; static ciInstanceKlass* _Object; static ciInstanceKlass* _Throwable; static ciInstanceKlass* _Thread; static ciInstanceKlass* _OutOfMemoryError; static ciInstanceKlass* _String; static ciSymbol* _unloaded_cisymbol; static ciInstanceKlass* _unloaded_ciinstance_klass; static ciObjArrayKlass* _unloaded_ciobjarrayklass; static jobject _ArrayIndexOutOfBoundsException_handle; static jobject _ArrayStoreException_handle; static jobject _ClassCastException_handle; ciInstance* _NullPointerException_instance; ciInstance* _ArithmeticException_instance; ciInstance* _ArrayIndexOutOfBoundsException_instance; ciInstance* _ArrayStoreException_instance; ciInstance* _ClassCastException_instance; // Look up a klass by name from a particular class loader (the accessor's). // If require_local, result must be defined in that class loader, or NULL. // If !require_local, a result from remote class loader may be reported, // if sufficient class loader constraints exist such that initiating // a class loading request from the given loader is bound to return // the class defined in the remote loader (or throw an error). // // Return an unloaded klass if !require_local and no class at all is found. // // The CI treats a klass as loaded if it is consistently defined in // another loader, even if it hasn't yet been loaded in all loaders // that could potentially see it via delegation. ciKlass* get_klass_by_name(ciKlass* accessing_klass, ciSymbol* klass_name, bool require_local); // Constant pool access. ciKlass* get_klass_by_index(ciInstanceKlass* loading_klass, int klass_index, bool& is_accessible); ciConstant get_constant_by_index(ciInstanceKlass* loading_klass, int constant_index); bool is_unresolved_string(ciInstanceKlass* loading_klass, int constant_index) const; bool is_unresolved_klass(ciInstanceKlass* loading_klass, int constant_index) const; ciField* get_field_by_index(ciInstanceKlass* loading_klass, int field_index); ciMethod* get_method_by_index(ciInstanceKlass* loading_klass, int method_index, Bytecodes::Code bc); // Implementation methods for loading and constant pool access. ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass, ciSymbol* klass_name, bool require_local); ciKlass* get_klass_by_index_impl(ciInstanceKlass* loading_klass, int klass_index, bool& is_accessible); ciConstant get_constant_by_index_impl(ciInstanceKlass* loading_klass, int constant_index); bool is_unresolved_string_impl (instanceKlass* loading_klass, int constant_index) const; bool is_unresolved_klass_impl (instanceKlass* loading_klass, int constant_index) const; ciField* get_field_by_index_impl(ciInstanceKlass* loading_klass, int field_index); ciMethod* get_method_by_index_impl(ciInstanceKlass* loading_klass, int method_index, Bytecodes::Code bc); // Helper methods bool check_klass_accessibility(ciKlass* accessing_klass, klassOop resolved_klassOop); methodOop lookup_method(instanceKlass* accessor, instanceKlass* holder, symbolOop name, symbolOop sig, Bytecodes::Code bc); // Get a ciObject from the object factory. Ensures uniqueness // of ciObjects. ciObject* get_object(oop o) { if (o == NULL) { return _null_object_instance; } else { return _factory->get(o); } } ciMethod* get_method_from_handle(jobject method); ciInstance* get_or_create_exception(jobject& handle, symbolHandle name); // Get a ciMethod representing either an unfound method or // a method with an unloaded holder. Ensures uniqueness of // the result. ciMethod* get_unloaded_method(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature) { return _factory->get_unloaded_method(holder, name, signature); } // Get a ciKlass representing an unloaded klass. // Ensures uniqueness of the result. ciKlass* get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) { return _factory->get_unloaded_klass(accessing_klass, name, true); } // See if we already have an unloaded klass for the given name // or return NULL if not. ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) { return _factory->get_unloaded_klass(accessing_klass, name, false); } // Get a ciReturnAddress corresponding to the given bci. // Ensures uniqueness of the result. ciReturnAddress* get_return_address(int bci) { return _factory->get_return_address(bci); } // Get a ciMethodData representing the methodData for a method // with none. ciMethodData* get_empty_methodData() { return _factory->get_empty_methodData(); } // General utility : get a buffer of some required length. // Used in symbol creation. char* name_buffer(int req_len); // Is this thread currently in the VM state? static bool is_in_vm(); // Helper routine for determining the validity of a compilation // with respect to concurrent class loading. void check_for_system_dictionary_modification(ciMethod* target); public: enum { MethodCompilable, MethodCompilable_not_at_tier, MethodCompilable_never }; ciEnv(CompileTask* task, int system_dictionary_modification_counter); // Used only during initialization of the ci ciEnv(Arena* arena); ~ciEnv(); OopRecorder* oop_recorder() { return _oop_recorder; } void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; } DebugInformationRecorder* debug_info() { return _debug_info; } void set_debug_info(DebugInformationRecorder* i) { _debug_info = i; } Dependencies* dependencies() { return _dependencies; } void set_dependencies(Dependencies* d) { _dependencies = d; } // This is true if the compilation is not going to produce code. // (It is reasonable to retry failed compilations.) bool failing() { return _failure_reason != NULL; } // Reason this compilation is failing, such as "too many basic blocks". const char* failure_reason() { return _failure_reason; } // Return state of appropriate compilability int compilable() { return _compilable; } bool break_at_compile() { return _break_at_compile; } void set_break_at_compile(bool z) { _break_at_compile = z; } // Cache Jvmti state void cache_jvmti_state(); bool jvmti_can_hotswap_or_post_breakpoint() const { return _jvmti_can_hotswap_or_post_breakpoint; } bool jvmti_can_examine_or_deopt_anywhere() const { return _jvmti_can_examine_or_deopt_anywhere; } bool jvmti_can_access_local_variables() const { return _jvmti_can_access_local_variables; } bool jvmti_can_post_exceptions() const { return _jvmti_can_post_exceptions; } // Cache DTrace flags void cache_dtrace_flags(); bool dtrace_extended_probes() const { return _dtrace_extended_probes; } bool dtrace_monitor_probes() const { return _dtrace_monitor_probes; } bool dtrace_method_probes() const { return _dtrace_method_probes; } bool dtrace_alloc_probes() const { return _dtrace_alloc_probes; } // The compiler task which has created this env. // May be useful to find out compile_id, comp_level, etc. CompileTask* task() { return _task; } // Handy forwards to the task: int comp_level(); // task()->comp_level() uint compile_id(); // task()->compile_id() // Register the result of a compilation. void 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 = true, bool has_unsafe_access = false); // Access to certain well known ciObjects. ciInstanceKlass* ArrayStoreException_klass() { return _ArrayStoreException; } ciInstanceKlass* Class_klass() { return _Class; } ciInstanceKlass* ClassCastException_klass() { return _ClassCastException; } ciInstanceKlass* Object_klass() { return _Object; } ciInstanceKlass* Throwable_klass() { return _Throwable; } ciInstanceKlass* Thread_klass() { return _Thread; } ciInstanceKlass* OutOfMemoryError_klass() { return _OutOfMemoryError; } ciInstanceKlass* String_klass() { return _String; } ciInstance* NullPointerException_instance() { assert(_NullPointerException_instance != NULL, "initialization problem"); return _NullPointerException_instance; } ciInstance* ArithmeticException_instance() { assert(_ArithmeticException_instance != NULL, "initialization problem"); return _ArithmeticException_instance; } // Lazy constructors: ciInstance* ArrayIndexOutOfBoundsException_instance(); ciInstance* ArrayStoreException_instance(); ciInstance* ClassCastException_instance(); static ciSymbol* unloaded_cisymbol() { return _unloaded_cisymbol; } static ciObjArrayKlass* unloaded_ciobjarrayklass() { return _unloaded_ciobjarrayklass; } static ciInstanceKlass* unloaded_ciinstance_klass() { return _unloaded_ciinstance_klass; } ciKlass* find_system_klass(ciSymbol* klass_name); // Note: To find a class from its name string, use ciSymbol::make, // but consider adding to vmSymbols.hpp instead. // Use this to make a holder for non-perm compile time constants. // The resulting array is guaranteed to satisfy "has_encoding". ciArray* make_array(GrowableArray* objects); // converts the ciKlass* representing the holder of a method into a // ciInstanceKlass*. This is needed since the holder of a method in // the bytecodes could be an array type. Basically this converts // array types into java/lang/Object and other types stay as they are. static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass); // Return the machine-level offset of o, which must be an element of a. // This may be used to form constant-loading expressions in lieu of simpler encodings. int array_element_offset_in_bytes(ciArray* a, ciObject* o); // Access to the compile-lifetime allocation arena. Arena* arena() { return _arena; } // What is the current compilation environment? static ciEnv* current() { return CompilerThread::current()->env(); } // Overload with current thread argument static ciEnv* current(CompilerThread *thread) { return thread->env(); } // Per-compiler data. (Used by C2 to publish the Compile* pointer.) void* compiler_data() { return _compiler_data; } void set_compiler_data(void* x) { _compiler_data = x; } // Notice that a method has been inlined in the current compile; // used only for statistics. void notice_inlined_method(ciMethod* method); // Total number of bytecodes in inlined methods in this compile int num_inlined_bytecodes() const; // Output stream for logging compilation info. CompileLog* log() { return _log; } void set_log(CompileLog* log) { _log = log; } // Check for changes to the system dictionary during compilation bool system_dictionary_modification_counter_changed(); void record_failure(const char* reason); void record_method_not_compilable(const char* reason, bool all_tiers = true); void record_out_of_memory_failure(); };