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 /*

  * Copyright (c) 1999, 2011, 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

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 #ifndef SHARE_VM_CI_CIMETHOD_HPP

 #define SHARE_VM_CI_CIMETHOD_HPP

 #include "ci/ciFlags.hpp"

 #include "ci/ciInstanceKlass.hpp"

 #include "ci/ciObject.hpp"

 #include "ci/ciSignature.hpp"

 #include "compiler/methodLiveness.hpp"

 #include "prims/methodHandles.hpp"

 #include "utilities/bitMap.hpp"

 class ciMethodBlocks;

 class MethodLiveness;

 class BitMap;

 class Arena;

 class BCEscapeAnalyzer;

 // ciMethod

 //

 // This class represents a methodOop in the HotSpot virtual

 // machine.

 class ciMethod : public ciObject {

   friend class CompileBroker;

   CI_PACKAGE_ACCESS

   friend class ciEnv;

   friend class ciExceptionHandlerStream;

   friend class ciBytecodeStream;

   friend class ciMethodHandle;

  private:

   // General method information.

   ciFlags          _flags;

   ciSymbol*        _name;

   ciInstanceKlass* _holder;

   ciSignature*     _signature;

   ciMethodData*    _method_data;

   ciMethodBlocks*   _method_blocks;

   // Code attributes.

   int _code_size;

   int _max_stack;

   int _max_locals;

   vmIntrinsics::ID _intrinsic_id;

   int _handler_count;

   int _interpreter_invocation_count;

   int _interpreter_throwout_count;

   bool _uses_monitors;

   bool _balanced_monitors;

   bool _is_c1_compilable;

   bool _is_c2_compilable;

   bool _can_be_statically_bound;

   // Lazy fields, filled in on demand

   address              _code;

   ciExceptionHandler** _exception_handlers;

   // Optional liveness analyzer.

   MethodLiveness* _liveness;

 #if defined(COMPILER2) || defined(SHARK)

   ciTypeFlow*         _flow;

   BCEscapeAnalyzer*   _bcea;

 #endif

   ciMethod(methodHandle h_m);

   ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature, ciInstanceKlass* accessor);

   methodOop get_methodOop() const {

     methodOop m = (methodOop)get_oop();

     assert(m != NULL, "illegal use of unloaded method");

     return m;

   }

   oop loader() const                             { return _holder->loader(); }

   const char* type_string()                      { return "ciMethod"; }

   void print_impl(outputStream* st);

   void load_code();

   void check_is_loaded() const                   { assert(is_loaded(), "not loaded"); }

   bool ensure_method_data(methodHandle h_m);

   void code_at_put(int bci, Bytecodes::Code code) {

     Bytecodes::check(code);

     assert(0 <= bci && bci < code_size(), "valid bci");

     address bcp = _code + bci;

     *bcp = code;

   }

  public:

   // Basic method information.

   ciFlags flags() const                          { check_is_loaded(); return _flags; }

   ciSymbol* name() const                         { return _name; }

   ciInstanceKlass* holder() const                { return _holder; }

   ciMethodData* method_data();

   ciMethodData* method_data_or_null();

   // Signature information.

   ciSignature* signature() const                 { return _signature; }

   ciType*      return_type() const               { return _signature->return_type(); }

   int          arg_size_no_receiver() const      { return _signature->size(); }

   // Can only be used on loaded ciMethods

   int          arg_size() const                  {

     check_is_loaded();

     return _signature->size() + (_flags.is_static() ? 0 : 1);

   }

   // Report the number of elements on stack when invoking this method.

   // This is different than the regular arg_size because invokdynamic

   // has an implicit receiver.

   int invoke_arg_size(Bytecodes::Code code) const {

     int arg_size = _signature->size();

     // Add a receiver argument, maybe:

     if (code != Bytecodes::_invokestatic &&

         code != Bytecodes::_invokedynamic) {

       arg_size++;

     }

     return arg_size;

   }

   // Method code and related information.

   address code()                                 { if (_code == NULL) load_code(); return _code; }

   int code_size() const                          { check_is_loaded(); return _code_size; }

   int max_stack() const                          { check_is_loaded(); return _max_stack; }

   int max_locals() const                         { check_is_loaded(); return _max_locals; }

   vmIntrinsics::ID intrinsic_id() const          { check_is_loaded(); return _intrinsic_id; }

   bool has_exception_handlers() const            { check_is_loaded(); return _handler_count > 0; }

   int exception_table_length() const             { check_is_loaded(); return _handler_count; }

   int interpreter_invocation_count() const       { check_is_loaded(); return _interpreter_invocation_count; }

   int interpreter_throwout_count() const         { check_is_loaded(); return _interpreter_throwout_count; }

   // Code size for inlining decisions.

   int code_size_for_inlining();

   int comp_level();

   int highest_osr_comp_level();

   Bytecodes::Code java_code_at_bci(int bci) {

     address bcp = code() + bci;

     return Bytecodes::java_code_at(NULL, bcp);

   }

   BCEscapeAnalyzer  *get_bcea();

   ciMethodBlocks    *get_method_blocks();

   bool    has_linenumber_table() const;          // length unknown until decompression

   u_char* compressed_linenumber_table() const;   // not preserved by gc

   int line_number_from_bci(int bci) const;

   // Runtime information.

   int           vtable_index();

 #ifdef SHARK

   int           itable_index();

 #endif // SHARK

   address       native_entry();

   address       interpreter_entry();

   // Analysis and profiling.

   //

   // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.

   bool          uses_monitors() const            { return _uses_monitors; } // this one should go away, it has a misleading name

   bool          has_monitor_bytecodes() const    { return _uses_monitors; }

   bool          has_balanced_monitors();

   // Returns a bitmap indicating which locals are required to be

   // maintained as live for deopt.  raw_liveness_at_bci is always the

   // direct output of the liveness computation while liveness_at_bci

   // may mark all locals as live to improve support for debugging Java

   // code by maintaining the state of as many locals as possible.

   MethodLivenessResult raw_liveness_at_bci(int bci);

   MethodLivenessResult liveness_at_bci(int bci);

   // Get the interpreters viewpoint on oop liveness.  MethodLiveness is

   // conservative in the sense that it may consider locals to be live which

   // cannot be live, like in the case where a local could contain an oop or

   // a primitive along different paths.  In that case the local must be

   // dead when those paths merge. Since the interpreter's viewpoint is

   // used when gc'ing an interpreter frame we need to use its viewpoint

   // during OSR when loading the locals.

   BitMap  live_local_oops_at_bci(int bci);

 #ifdef COMPILER1

   const BitMap  bci_block_start();

 #endif

   ciTypeFlow*   get_flow_analysis();

   ciTypeFlow*   get_osr_flow_analysis(int osr_bci);  // alternate entry point

   ciCallProfile call_profile_at_bci(int bci);

   int           interpreter_call_site_count(int bci);

   // Given a certain calling environment, find the monomorphic target

   // for the call.  Return NULL if the call is not monomorphic in

   // its calling environment.

   ciMethod* find_monomorphic_target(ciInstanceKlass* caller,

                                     ciInstanceKlass* callee_holder,

                                     ciInstanceKlass* actual_receiver);

   // Given a known receiver klass, find the target for the call.

   // Return NULL if the call has no target or is abstract.

   ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver);

   // Find the proper vtable index to invoke this method.

   int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);

   // Compilation directives

   bool will_link(ciKlass* accessing_klass,

                  ciKlass* declared_method_holder,

                  Bytecodes::Code bc);

   bool should_exclude();

   bool should_inline();

   bool should_not_inline();

   bool should_print_assembly();

   bool break_at_execute();

   bool has_option(const char *option);

   bool can_be_compiled();

   bool can_be_osr_compiled(int entry_bci);

   void set_not_compilable();

   bool has_compiled_code();

   int  instructions_size(int comp_level = CompLevel_any);

   void log_nmethod_identity(xmlStream* log);

   bool is_not_reached(int bci);

   bool was_executed_more_than(int times);

   bool has_unloaded_classes_in_signature();

   bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const;

   bool check_call(int refinfo_index, bool is_static) const;

   bool ensure_method_data();  // make sure it exists in the VM also

   int scale_count(int count, float prof_factor = 1.);  // make MDO count commensurate with IIC

   // JSR 292 support

   bool is_method_handle_invoke()  const;

   bool is_method_handle_adapter() const;

   ciInstance* method_handle_type();

   // What kind of ciObject is this?

   bool is_method()                               { return true; }

   // Java access flags

   bool is_public      () const                   { return flags().is_public(); }

   bool is_private     () const                   { return flags().is_private(); }

   bool is_protected   () const                   { return flags().is_protected(); }

   bool is_static      () const                   { return flags().is_static(); }

   bool is_final       () const                   { return flags().is_final(); }

   bool is_synchronized() const                   { return flags().is_synchronized(); }

   bool is_native      () const                   { return flags().is_native(); }

   bool is_interface   () const                   { return flags().is_interface(); }

   bool is_abstract    () const                   { return flags().is_abstract(); }

   bool is_strict      () const                   { return flags().is_strict(); }

   // Other flags

   bool is_empty_method() const;

   bool is_vanilla_constructor() const;

   bool is_final_method() const                   { return is_final() || holder()->is_final(); }

   bool has_loops      () const;

   bool has_jsrs       () const;

   bool is_accessor    () const;

   bool is_initializer () const;

   bool can_be_statically_bound() const           { return _can_be_statically_bound; }

   // Print the bytecodes of this method.

   void print_codes_on(outputStream* st);

   void print_codes() {

     print_codes_on(tty);

   }

   void print_codes_on(int from, int to, outputStream* st);

   // Print the name of this method in various incarnations.

   void print_name(outputStream* st = tty);

   void print_short_name(outputStream* st = tty);

   methodOop get_method_handle_target() {

     KlassHandle receiver_limit; int flags = 0;

     methodHandle m = MethodHandles::decode_method(get_oop(), receiver_limit, flags);

     return m();

   }

 };

 #endif // SHARE_VM_CI_CIMETHOD_HPP