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 /*

  * Copyright (c) 1999, 2012, 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

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 #ifndef SHARE_VM_CI_CIENV_HPP

 #define SHARE_VM_CI_CIENV_HPP

 #include "ci/ciClassList.hpp"

 #include "ci/ciObjectFactory.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "code/debugInfoRec.hpp"

 #include "code/dependencies.hpp"

 #include "code/exceptionHandlerTable.hpp"

 #include "compiler/oopMap.hpp"

 #include "runtime/thread.hpp"

 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_access_local_variables;

   bool  _jvmti_can_post_on_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;

 #define WK_KLASS_DECL(name, ignore_s, ignore_o) static ciInstanceKlass* _##name;

   WK_KLASSES_DO(WK_KLASS_DECL)

 #undef WK_KLASS_DECL

   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;

   ciInstance* _the_null_string;      // The Java string "null"

   ciInstance* _the_min_jint_string; // The Java string "-2147483648"

   // 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(constantPoolHandle cpool,

                                 int klass_index,

                                 bool& is_accessible,

                                 ciInstanceKlass* loading_klass);

   ciConstant get_constant_by_index(constantPoolHandle cpool,

                                    int pool_index, int cache_index,

                                    ciInstanceKlass* accessor);

   ciField*   get_field_by_index(ciInstanceKlass* loading_klass,

                                 int field_index);

   ciMethod*  get_method_by_index(constantPoolHandle cpool,

                                  int method_index, Bytecodes::Code bc,

                                  ciInstanceKlass* loading_klass);

   // Implementation methods for loading and constant pool access.

   ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass,

                                   constantPoolHandle cpool,

                                   ciSymbol* klass_name,

                                   bool require_local);

   ciKlass*   get_klass_by_index_impl(constantPoolHandle cpool,

                                      int klass_index,

                                      bool& is_accessible,

                                      ciInstanceKlass* loading_klass);

   ciConstant get_constant_by_index_impl(constantPoolHandle cpool,

                                         int pool_index, int cache_index,

                                         ciInstanceKlass* loading_klass);

   ciField*   get_field_by_index_impl(ciInstanceKlass* loading_klass,

                                      int field_index);

   ciMethod*  get_method_by_index_impl(constantPoolHandle cpool,

                                       int method_index, Bytecodes::Code bc,

                                       ciInstanceKlass* loading_klass);

   // Helper methods

   bool       check_klass_accessibility(ciKlass* accessing_klass,

                                       Klass* resolved_klass);

   Method*    lookup_method(InstanceKlass*  accessor,

                            InstanceKlass*  holder,

                            Symbol*         name,

                            Symbol*         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);

     }

   }

   ciSymbol* get_symbol(Symbol* o) {

     if (o == NULL) {

       ShouldNotReachHere();

       return NULL;

     } else {

       return _factory->get_symbol(o);

     }

   }

   ciMetadata* get_metadata(Metadata* o) {

     if (o == NULL) {

       return NULL;

     } else {

       return _factory->get_metadata(o);

     }

   }

   ciInstance* get_instance(oop o) {

     if (o == NULL) return NULL;

     return get_object(o)->as_instance();

   }

   ciObjArrayKlass* get_obj_array_klass(Klass* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_obj_array_klass();

   }

   ciTypeArrayKlass* get_type_array_klass(Klass* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_type_array_klass();

   }

   ciKlass* get_klass(Klass* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_klass();

   }

   ciInstanceKlass* get_instance_klass(Klass* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_instance_klass();

   }

   ciMethod* get_method(Method* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_method();

   }

   ciMethodData* get_method_data(MethodData* o) {

     if (o == NULL) return NULL;

     return get_metadata(o)->as_method_data();

   }

   ciMethod* get_method_from_handle(Method* method);

   ciInstance* get_or_create_exception(jobject& handle, Symbol* 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,

                                 ciInstanceKlass* accessor) {

     return _factory->get_unloaded_method(holder, name, signature, accessor);

   }

   // 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);

   }

   // Get a ciKlass representing an unloaded klass mirror.

   // Result is not necessarily unique, but will be unloaded.

   ciInstance* get_unloaded_klass_mirror(ciKlass* type) {

     return _factory->get_unloaded_klass_mirror(type);

   }

   // Get a ciInstance representing an unresolved method handle constant.

   ciInstance* get_unloaded_method_handle_constant(ciKlass*  holder,

                                                   ciSymbol* name,

                                                   ciSymbol* signature,

                                                   int       ref_kind) {

     return _factory->get_unloaded_method_handle_constant(holder, name, signature, ref_kind);

   }

   // Get a ciInstance representing an unresolved method type constant.

   ciInstance* get_unloaded_method_type_constant(ciSymbol* signature) {

     return _factory->get_unloaded_method_type_constant(signature);

   }

   // 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 method dependencies (e.g. concurrent class loading).

   void validate_compile_task_dependencies(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; }

   const char* retry_message() const {

     switch (_compilable) {

       case ciEnv::MethodCompilable_not_at_tier:

         return "retry at different tier";

       case ciEnv::MethodCompilable_never:

         return "not retryable";

       case ciEnv::MethodCompilable:

         return NULL;

       default:

         ShouldNotReachHere();

         return NULL;

     }

   }

   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_access_local_variables()     const { return _jvmti_can_access_local_variables; }

   bool  jvmti_can_post_on_exceptions()         const { return _jvmti_can_post_on_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_unsafe_access,

                        bool                      has_wide_vectors);

   // Access to certain well known ciObjects.

 #define WK_KLASS_FUNC(name, ignore_s, ignore_o) \

   ciInstanceKlass* name() { \

     return _##name;\

   }

   WK_KLASSES_DO(WK_KLASS_FUNC)

 #undef WK_KLASS_FUNC

   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();

   ciInstance* the_null_string();

   ciInstance* the_min_jint_string();

   static ciSymbol* unloaded_cisymbol() {

     return _unloaded_cisymbol;

   }

   static ciObjArrayKlass* unloaded_ciobjarrayklass() {

     return _unloaded_ciobjarrayklass;

   }

   static ciInstanceKlass* unloaded_ciinstance_klass() {

     return _unloaded_ciinstance_klass;

   }

   ciInstance* unloaded_ciinstance();

   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.

   // 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();

   // RedefineClasses support

   void metadata_do(void f(Metadata*)) { _factory->metadata_do(f); }

   // Dump the compilation replay data for the ciEnv to the stream.

   void dump_replay_data(outputStream* out);

   void dump_replay_data_unsafe(outputStream* out);

 };

 #endif // SHARE_VM_CI_CIENV_HPP