hotspot/src/share/vm/ci/ciEnv.hpp
author xdono
Tue, 28 Jul 2009 12:12:40 -0700
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child 3908 24b55ad4c228
permissions -rw-r--r--
6862919: Update copyright year Summary: Update copyright for files that have been modified in 2009, up to 07/09 Reviewed-by: tbell, ohair
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/*
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 * Copyright 1999-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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class CompileTask;
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// ciEnv
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//
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// This class is the top level broker for requests from the compiler
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// to the VM.
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class ciEnv : StackObj {
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  CI_PACKAGE_ACCESS_TO
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  friend class CompileBroker;
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  friend class Dependencies;  // for get_object, during logging
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private:
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  Arena*           _arena;       // Alias for _ciEnv_arena except in init_shared_objects()
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  Arena            _ciEnv_arena;
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  int              _system_dictionary_modification_counter;
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  ciObjectFactory* _factory;
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  OopRecorder*     _oop_recorder;
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  DebugInformationRecorder* _debug_info;
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  Dependencies*    _dependencies;
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  const char*      _failure_reason;
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  int              _compilable;
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  bool             _break_at_compile;
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  int              _num_inlined_bytecodes;
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  CompileTask*     _task;           // faster access to CompilerThread::task
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  CompileLog*      _log;            // faster access to CompilerThread::log
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  void*            _compiler_data;  // compiler-specific stuff, if any
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  char* _name_buffer;
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  int   _name_buffer_len;
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  // Cache Jvmti state
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  bool  _jvmti_can_hotswap_or_post_breakpoint;
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  bool  _jvmti_can_examine_or_deopt_anywhere;
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  bool  _jvmti_can_access_local_variables;
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  bool  _jvmti_can_post_exceptions;
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  // Cache DTrace flags
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  bool  _dtrace_extended_probes;
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  bool  _dtrace_monitor_probes;
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  bool  _dtrace_method_probes;
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  bool  _dtrace_alloc_probes;
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  // Distinguished instances of certain ciObjects..
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  static ciObject*              _null_object_instance;
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  static ciMethodKlass*         _method_klass_instance;
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  static ciSymbolKlass*         _symbol_klass_instance;
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  static ciKlassKlass*          _klass_klass_instance;
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  static ciInstanceKlassKlass*  _instance_klass_klass_instance;
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  static ciTypeArrayKlassKlass* _type_array_klass_klass_instance;
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  static ciObjArrayKlassKlass*  _obj_array_klass_klass_instance;
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  static ciInstanceKlass* _ArrayStoreException;
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  static ciInstanceKlass* _Class;
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  static ciInstanceKlass* _ClassCastException;
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  static ciInstanceKlass* _Object;
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  static ciInstanceKlass* _Throwable;
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  static ciInstanceKlass* _Thread;
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  static ciInstanceKlass* _OutOfMemoryError;
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  static ciInstanceKlass* _String;
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  static ciSymbol*        _unloaded_cisymbol;
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  static ciInstanceKlass* _unloaded_ciinstance_klass;
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  static ciObjArrayKlass* _unloaded_ciobjarrayklass;
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  static jobject _ArrayIndexOutOfBoundsException_handle;
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  static jobject _ArrayStoreException_handle;
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  static jobject _ClassCastException_handle;
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  ciInstance* _NullPointerException_instance;
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  ciInstance* _ArithmeticException_instance;
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  ciInstance* _ArrayIndexOutOfBoundsException_instance;
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  ciInstance* _ArrayStoreException_instance;
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  ciInstance* _ClassCastException_instance;
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  // Look up a klass by name from a particular class loader (the accessor's).
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  // If require_local, result must be defined in that class loader, or NULL.
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  // If !require_local, a result from remote class loader may be reported,
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  // if sufficient class loader constraints exist such that initiating
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  // a class loading request from the given loader is bound to return
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  // the class defined in the remote loader (or throw an error).
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  //
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  // Return an unloaded klass if !require_local and no class at all is found.
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  //
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  // The CI treats a klass as loaded if it is consistently defined in
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  // another loader, even if it hasn't yet been loaded in all loaders
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  // that could potentially see it via delegation.
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  ciKlass* get_klass_by_name(ciKlass* accessing_klass,
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                             ciSymbol* klass_name,
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                             bool require_local);
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  // Constant pool access.
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  ciKlass*   get_klass_by_index(ciInstanceKlass* loading_klass,
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                                int klass_index,
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                                bool& is_accessible);
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  ciConstant get_constant_by_index(ciInstanceKlass* loading_klass,
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                                   int constant_index);
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  bool       is_unresolved_string(ciInstanceKlass* loading_klass,
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                                   int constant_index) const;
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  bool       is_unresolved_klass(ciInstanceKlass* loading_klass,
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                                   int constant_index) const;
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  ciField*   get_field_by_index(ciInstanceKlass* loading_klass,
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                                int field_index);
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  ciMethod*  get_method_by_index(ciInstanceKlass* loading_klass,
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                                 int method_index, Bytecodes::Code bc);
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  // Implementation methods for loading and constant pool access.
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  ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass,
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                                  ciSymbol* klass_name,
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                                  bool require_local);
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  ciKlass*   get_klass_by_index_impl(ciInstanceKlass* loading_klass,
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                                     int klass_index,
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                                     bool& is_accessible);
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  ciConstant get_constant_by_index_impl(ciInstanceKlass* loading_klass,
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                                        int constant_index);
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  bool       is_unresolved_string_impl (instanceKlass* loading_klass,
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                                        int constant_index) const;
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  bool       is_unresolved_klass_impl (instanceKlass* loading_klass,
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                                        int constant_index) const;
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  ciField*   get_field_by_index_impl(ciInstanceKlass* loading_klass,
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                                     int field_index);
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  ciMethod*  get_method_by_index_impl(ciInstanceKlass* loading_klass,
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                                      int method_index, Bytecodes::Code bc);
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  // Helper methods
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  bool       check_klass_accessibility(ciKlass* accessing_klass,
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                                      klassOop resolved_klassOop);
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  methodOop  lookup_method(instanceKlass*  accessor,
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                           instanceKlass*  holder,
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                           symbolOop       name,
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                           symbolOop       sig,
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                           Bytecodes::Code bc);
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  // Get a ciObject from the object factory.  Ensures uniqueness
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  // of ciObjects.
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  ciObject* get_object(oop o) {
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    if (o == NULL) {
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      return _null_object_instance;
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    } else {
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      return _factory->get(o);
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    }
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  }
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  ciMethod* get_method_from_handle(jobject method);
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  ciInstance* get_or_create_exception(jobject& handle, symbolHandle name);
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  // Get a ciMethod representing either an unfound method or
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  // a method with an unloaded holder.  Ensures uniqueness of
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  // the result.
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  ciMethod* get_unloaded_method(ciInstanceKlass* holder,
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                                ciSymbol*        name,
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                                ciSymbol*        signature) {
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    return _factory->get_unloaded_method(holder, name, signature);
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  }
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  // Get a ciKlass representing an unloaded klass.
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  // Ensures uniqueness of the result.
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  ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
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                              ciSymbol* name) {
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    return _factory->get_unloaded_klass(accessing_klass, name, true);
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  }
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  // See if we already have an unloaded klass for the given name
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  // or return NULL if not.
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  ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) {
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    return _factory->get_unloaded_klass(accessing_klass, name, false);
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  }
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  // Get a ciReturnAddress corresponding to the given bci.
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  // Ensures uniqueness of the result.
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  ciReturnAddress* get_return_address(int bci) {
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    return _factory->get_return_address(bci);
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  }
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  // Get a ciMethodData representing the methodData for a method
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  // with none.
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  ciMethodData* get_empty_methodData() {
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    return _factory->get_empty_methodData();
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  }
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  // General utility : get a buffer of some required length.
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  // Used in symbol creation.
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  char* name_buffer(int req_len);
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  // Is this thread currently in the VM state?
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  static bool is_in_vm();
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  // Helper routine for determining the validity of a compilation
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  // with respect to concurrent class loading.
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  void check_for_system_dictionary_modification(ciMethod* target);
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public:
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  enum {
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    MethodCompilable,
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    MethodCompilable_not_at_tier,
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    MethodCompilable_never
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  };
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  ciEnv(CompileTask* task, int system_dictionary_modification_counter);
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  // Used only during initialization of the ci
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  ciEnv(Arena* arena);
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  ~ciEnv();
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  OopRecorder* oop_recorder() { return _oop_recorder; }
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  void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; }
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  DebugInformationRecorder* debug_info() { return _debug_info; }
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  void set_debug_info(DebugInformationRecorder* i) { _debug_info = i; }
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  Dependencies* dependencies() { return _dependencies; }
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  void set_dependencies(Dependencies* d) { _dependencies = d; }
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  // This is true if the compilation is not going to produce code.
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  // (It is reasonable to retry failed compilations.)
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  bool failing() { return _failure_reason != NULL; }
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  // Reason this compilation is failing, such as "too many basic blocks".
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  const char* failure_reason() { return _failure_reason; }
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  // Return state of appropriate compilability
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  int compilable() { return _compilable; }
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  bool break_at_compile() { return _break_at_compile; }
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  void set_break_at_compile(bool z) { _break_at_compile = z; }
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2867
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  // Cache Jvmti state
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  void  cache_jvmti_state();
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  bool  jvmti_can_hotswap_or_post_breakpoint() const { return _jvmti_can_hotswap_or_post_breakpoint; }
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  bool  jvmti_can_examine_or_deopt_anywhere()  const { return _jvmti_can_examine_or_deopt_anywhere; }
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  bool  jvmti_can_access_local_variables()     const { return _jvmti_can_access_local_variables; }
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  bool  jvmti_can_post_exceptions()            const { return _jvmti_can_post_exceptions; }
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  // Cache DTrace flags
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  void  cache_dtrace_flags();
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  bool  dtrace_extended_probes() const { return _dtrace_extended_probes; }
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  bool  dtrace_monitor_probes()  const { return _dtrace_monitor_probes; }
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  bool  dtrace_method_probes()   const { return _dtrace_method_probes; }
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  bool  dtrace_alloc_probes()    const { return _dtrace_alloc_probes; }
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1
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  // The compiler task which has created this env.
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  // May be useful to find out compile_id, comp_level, etc.
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  CompileTask* task() { return _task; }
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  // Handy forwards to the task:
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  int comp_level();   // task()->comp_level()
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  uint compile_id();  // task()->compile_id()
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  // Register the result of a compilation.
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  void register_method(ciMethod*                 target,
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                       int                       entry_bci,
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                       CodeOffsets*              offsets,
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                       int                       orig_pc_offset,
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                       CodeBuffer*               code_buffer,
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                       int                       frame_words,
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                       OopMapSet*                oop_map_set,
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                       ExceptionHandlerTable*    handler_table,
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                       ImplicitExceptionTable*   inc_table,
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                       AbstractCompiler*         compiler,
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                       int                       comp_level,
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                       bool                      has_debug_info = true,
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                       bool                      has_unsafe_access = false);
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  // Access to certain well known ciObjects.
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  ciInstanceKlass* ArrayStoreException_klass() {
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    return _ArrayStoreException;
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  }
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  ciInstanceKlass* Class_klass() {
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    return _Class;
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  }
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  ciInstanceKlass* ClassCastException_klass() {
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    return _ClassCastException;
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  }
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  ciInstanceKlass* Object_klass() {
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    return _Object;
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  }
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  ciInstanceKlass* Throwable_klass() {
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    return _Throwable;
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  }
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  ciInstanceKlass* Thread_klass() {
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    return _Thread;
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  }
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  ciInstanceKlass* OutOfMemoryError_klass() {
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    return _OutOfMemoryError;
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  }
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  ciInstanceKlass* String_klass() {
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    return _String;
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  }
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  ciInstance* NullPointerException_instance() {
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    assert(_NullPointerException_instance != NULL, "initialization problem");
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    return _NullPointerException_instance;
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  }
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  ciInstance* ArithmeticException_instance() {
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    assert(_ArithmeticException_instance != NULL, "initialization problem");
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    return _ArithmeticException_instance;
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  }
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  // Lazy constructors:
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  ciInstance* ArrayIndexOutOfBoundsException_instance();
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  ciInstance* ArrayStoreException_instance();
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  ciInstance* ClassCastException_instance();
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  static ciSymbol* unloaded_cisymbol() {
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    return _unloaded_cisymbol;
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  }
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  static ciObjArrayKlass* unloaded_ciobjarrayklass() {
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    return _unloaded_ciobjarrayklass;
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  }
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  static ciInstanceKlass* unloaded_ciinstance_klass() {
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    return _unloaded_ciinstance_klass;
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  }
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  ciKlass*  find_system_klass(ciSymbol* klass_name);
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  // Note:  To find a class from its name string, use ciSymbol::make,
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  // but consider adding to vmSymbols.hpp instead.
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  // Use this to make a holder for non-perm compile time constants.
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  // The resulting array is guaranteed to satisfy "has_encoding".
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  ciArray*  make_array(GrowableArray<ciObject*>* objects);
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  // converts the ciKlass* representing the holder of a method into a
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  // ciInstanceKlass*.  This is needed since the holder of a method in
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  // the bytecodes could be an array type.  Basically this converts
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  // array types into java/lang/Object and other types stay as they are.
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  static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass);
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  // Return the machine-level offset of o, which must be an element of a.
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  // This may be used to form constant-loading expressions in lieu of simpler encodings.
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  int       array_element_offset_in_bytes(ciArray* a, ciObject* o);
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  // Access to the compile-lifetime allocation arena.
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  Arena*    arena() { return _arena; }
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  // What is the current compilation environment?
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  static ciEnv* current() { return CompilerThread::current()->env(); }
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  // Overload with current thread argument
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  static ciEnv* current(CompilerThread *thread) { return thread->env(); }
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  // Per-compiler data.  (Used by C2 to publish the Compile* pointer.)
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  void* compiler_data() { return _compiler_data; }
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  void set_compiler_data(void* x) { _compiler_data = x; }
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  // Notice that a method has been inlined in the current compile;
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  // used only for statistics.
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  void notice_inlined_method(ciMethod* method);
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  // Total number of bytecodes in inlined methods in this compile
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  int num_inlined_bytecodes() const;
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  // Output stream for logging compilation info.
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  CompileLog* log() { return _log; }
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  void set_log(CompileLog* log) { _log = log; }
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  // Check for changes to the system dictionary during compilation
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  bool system_dictionary_modification_counter_changed();
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  void record_failure(const char* reason);
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  void record_method_not_compilable(const char* reason, bool all_tiers = true);
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  void record_out_of_memory_failure();
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};