jdk8-mips64-public/hotspot: src/share/vm/code/codeBlob.hpp@a5de0cc2f91c

8008555: Debugging code in compiled method sometimes leaks memory
Summary: support for strings that have same life-time as code that uses them.
Reviewed-by: kvn, twisti

     1 /*

     2  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_CODE_CODEBLOB_HPP

    26 #define SHARE_VM_CODE_CODEBLOB_HPP

    28 #include "asm/codeBuffer.hpp"

    29 #include "compiler/oopMap.hpp"

    30 #include "runtime/frame.hpp"

    31 #include "runtime/handles.hpp"

    33 // CodeBlob - superclass for all entries in the CodeCache.

    34 //

    35 // Suptypes are:

    36 //   nmethod            : Compiled Java methods (include method that calls to native code)

    37 //   RuntimeStub        : Call to VM runtime methods

    38 //   DeoptimizationBlob : Used for deoptimizatation

    39 //   ExceptionBlob      : Used for stack unrolling

    40 //   SafepointBlob      : Used to handle illegal instruction exceptions

    41 //

    42 //

    43 // Layout:

    44 //   - header

    45 //   - relocation

    46 //   - content space

    47 //     - instruction space

    48 //   - data space

    49 class DeoptimizationBlob;

    51 class CodeBlob VALUE_OBJ_CLASS_SPEC {

    53   friend class VMStructs;

    55  private:

    56   const char* _name;

    57   int        _size;                              // total size of CodeBlob in bytes

    58   int        _header_size;                       // size of header (depends on subclass)

    59   int        _relocation_size;                   // size of relocation

    60   int        _content_offset;                    // offset to where content region begins (this includes consts, insts, stubs)

    61   int        _code_offset;                       // offset to where instructions region begins (this includes insts, stubs)

    62   int        _frame_complete_offset;             // instruction offsets in [0.._frame_complete_offset) have

    63                                                  // not finished setting up their frame. Beware of pc's in

    64                                                  // that range. There is a similar range(s) on returns

    65                                                  // which we don't detect.

    66   int        _data_offset;                       // offset to where data region begins

    67   int        _frame_size;                        // size of stack frame

    68   OopMapSet* _oop_maps;                          // OopMap for this CodeBlob

    69   CodeStrings _strings;

    71  public:

    72   // Returns the space needed for CodeBlob

    73   static unsigned int allocation_size(CodeBuffer* cb, int header_size);

    75   // Creation

    76   // a) simple CodeBlob

    77   // frame_complete is the offset from the beginning of the instructions

    78   // to where the frame setup (from stackwalk viewpoint) is complete.

    79   CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);

    81   // b) full CodeBlob

    82   CodeBlob(

    83     const char* name,

    84     CodeBuffer* cb,

    85     int         header_size,

    86     int         size,

    87     int         frame_complete,

    88     int         frame_size,

    89     OopMapSet*  oop_maps

    90   );

    92   // Deletion

    93   void flush();

    95   // Typing

    96   virtual bool is_buffer_blob() const            { return false; }

    97   virtual bool is_nmethod() const                { return false; }

    98   virtual bool is_runtime_stub() const           { return false; }

    99   virtual bool is_deoptimization_stub() const    { return false; }

   100   virtual bool is_uncommon_trap_stub() const     { return false; }

   101   virtual bool is_exception_stub() const         { return false; }

   102   virtual bool is_safepoint_stub() const              { return false; }

   103   virtual bool is_adapter_blob() const                { return false; }

   104   virtual bool is_method_handles_adapter_blob() const { return false; }

   106   virtual bool is_compiled_by_c2() const         { return false; }

   107   virtual bool is_compiled_by_c1() const         { return false; }

   109   // Casting

   110   nmethod* as_nmethod_or_null()                  { return is_nmethod() ? (nmethod*) this : NULL; }

   112   // Boundaries

   113   address    header_begin() const                { return (address)    this; }

   114   address    header_end() const                  { return ((address)   this) + _header_size; };

   115   relocInfo* relocation_begin() const            { return (relocInfo*) header_end(); };

   116   relocInfo* relocation_end() const              { return (relocInfo*)(header_end()   + _relocation_size); }

   117   address    content_begin() const               { return (address)    header_begin() + _content_offset; }

   118   address    content_end() const                 { return (address)    header_begin() + _data_offset; }

   119   address    code_begin() const                  { return (address)    header_begin() + _code_offset; }

   120   address    code_end() const                    { return (address)    header_begin() + _data_offset; }

   121   address    data_begin() const                  { return (address)    header_begin() + _data_offset; }

   122   address    data_end() const                    { return (address)    header_begin() + _size; }

   124   // Offsets

   125   int relocation_offset() const                  { return _header_size; }

   126   int content_offset() const                     { return _content_offset; }

   127   int code_offset() const                        { return _code_offset; }

   128   int data_offset() const                        { return _data_offset; }

   130   // Sizes

   131   int size() const                               { return _size; }

   132   int header_size() const                        { return _header_size; }

   133   int relocation_size() const                    { return (address) relocation_end() - (address) relocation_begin(); }

   134   int content_size() const                       { return           content_end()    -           content_begin();    }

   135   int code_size() const                          { return           code_end()       -           code_begin();       }

   136   int data_size() const                          { return           data_end()       -           data_begin();       }

   138   // Containment

   139   bool blob_contains(address addr) const         { return header_begin()       <= addr && addr < data_end();       }

   140   bool relocation_contains(relocInfo* addr) const{ return relocation_begin()   <= addr && addr < relocation_end(); }

   141   bool content_contains(address addr) const      { return content_begin()      <= addr && addr < content_end();    }

   142   bool code_contains(address addr) const         { return code_begin()         <= addr && addr < code_end();       }

   143   bool data_contains(address addr) const         { return data_begin()         <= addr && addr < data_end();       }

   144   bool contains(address addr) const              { return content_contains(addr); }

   145   bool is_frame_complete_at(address addr) const  { return code_contains(addr) &&

   146                                                           addr >= code_begin() + _frame_complete_offset; }

   148   // CodeCache support: really only used by the nmethods, but in order to get

   149   // asserts and certain bookkeeping to work in the CodeCache they are defined

   150   // virtual here.

   151   virtual bool is_zombie() const                 { return false; }

   152   virtual bool is_locked_by_vm() const           { return false; }

   154   virtual bool is_unloaded() const               { return false; }

   155   virtual bool is_not_entrant() const            { return false; }

   157   // GC support

   158   virtual bool is_alive() const                  = 0;

   160   // OopMap for frame

   161   OopMapSet* oop_maps() const                    { return _oop_maps; }

   162   void set_oop_maps(OopMapSet* p);

   163   OopMap* oop_map_for_return_address(address return_address);

   164   virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { ShouldNotReachHere(); }

   166   // Frame support

   167   int  frame_size() const                        { return _frame_size; }

   168   void set_frame_size(int size)                  { _frame_size = size; }

   170   // Returns true, if the next frame is responsible for GC'ing oops passed as arguments

   171   virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; }

   173   // Naming

   174   const char* name() const                       { return _name; }

   175   void set_name(const char* name)                { _name = name; }

   177   // Debugging

   178   virtual void verify();

   179   void print() const                             { print_on(tty); }

   180   virtual void print_on(outputStream* st) const;

   181   virtual void print_value_on(outputStream* st) const;

   183   // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.

   184   static void trace_new_stub(CodeBlob* blob, const char* name1, const char* name2 = "");

   186   // Print the comment associated with offset on stream, if there is one

   187   virtual void print_block_comment(outputStream* stream, address block_begin) const {

   188     intptr_t offset = (intptr_t)(block_begin - code_begin());

   189     _strings.print_block_comment(stream, offset);

   190   }

   192   // Transfer ownership of comments to this CodeBlob

   193   void set_strings(CodeStrings& strings) {

   194     _strings.assign(strings);

   195   }

   196 };

   199 //----------------------------------------------------------------------------------------------------

   200 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.

   202 class BufferBlob: public CodeBlob {

   203   friend class VMStructs;

   204   friend class AdapterBlob;

   205   friend class MethodHandlesAdapterBlob;

   207  private:

   208   // Creation support

   209   BufferBlob(const char* name, int size);

   210   BufferBlob(const char* name, int size, CodeBuffer* cb);

   212   void* operator new(size_t s, unsigned size);

   214  public:

   215   // Creation

   216   static BufferBlob* create(const char* name, int buffer_size);

   217   static BufferBlob* create(const char* name, CodeBuffer* cb);

   219   static void free(BufferBlob* buf);

   221   // Typing

   222   virtual bool is_buffer_blob() const            { return true; }

   224   // GC/Verification support

   225   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }

   226   bool is_alive() const                          { return true; }

   228   void verify();

   229   void print_on(outputStream* st) const;

   230   void print_value_on(outputStream* st) const;

   231 };

   234 //----------------------------------------------------------------------------------------------------

   235 // AdapterBlob: used to hold C2I/I2C adapters

   237 class AdapterBlob: public BufferBlob {

   238 private:

   239   AdapterBlob(int size, CodeBuffer* cb);

   241 public:

   242   // Creation

   243   static AdapterBlob* create(CodeBuffer* cb);

   245   // Typing

   246   virtual bool is_adapter_blob() const { return true; }

   247 };

   250 //----------------------------------------------------------------------------------------------------

   251 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters

   253 class MethodHandlesAdapterBlob: public BufferBlob {

   254 private:

   255   MethodHandlesAdapterBlob(int size)                 : BufferBlob("MethodHandles adapters", size) {}

   256   MethodHandlesAdapterBlob(int size, CodeBuffer* cb) : BufferBlob("MethodHandles adapters", size, cb) {}

   258 public:

   259   // Creation

   260   static MethodHandlesAdapterBlob* create(int buffer_size);

   262   // Typing

   263   virtual bool is_method_handles_adapter_blob() const { return true; }

   264 };

   267 //----------------------------------------------------------------------------------------------------

   268 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine

   270 class RuntimeStub: public CodeBlob {

   271   friend class VMStructs;

   272  private:

   273   bool        _caller_must_gc_arguments;

   275   // Creation support

   276   RuntimeStub(

   277     const char* name,

   278     CodeBuffer* cb,

   279     int         size,

   280     int         frame_complete,

   281     int         frame_size,

   282     OopMapSet*  oop_maps,

   283     bool        caller_must_gc_arguments

   284   );

   286   void* operator new(size_t s, unsigned size);

   288  public:

   289   // Creation

   290   static RuntimeStub* new_runtime_stub(

   291     const char* stub_name,

   292     CodeBuffer* cb,

   293     int         frame_complete,

   294     int         frame_size,

   295     OopMapSet*  oop_maps,

   296     bool        caller_must_gc_arguments

   297   );

   299   // Typing

   300   bool is_runtime_stub() const                   { return true; }

   302   // GC support

   303   bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }

   305   address entry_point()                          { return code_begin(); }

   307   // GC/Verification support

   308   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }

   309   bool is_alive() const                          { return true; }

   311   void verify();

   312   void print_on(outputStream* st) const;

   313   void print_value_on(outputStream* st) const;

   314 };

   317 //----------------------------------------------------------------------------------------------------

   318 // Super-class for all blobs that exist in only one instance. Implements default behaviour.

   320 class SingletonBlob: public CodeBlob {

   321   friend class VMStructs;

   323  protected:

   324   void* operator new(size_t s, unsigned size);

   326  public:

   327    SingletonBlob(

   328      const char* name,

   329      CodeBuffer* cb,

   330      int         header_size,

   331      int         size,

   332      int         frame_size,

   333      OopMapSet*  oop_maps

   334    )

   335    : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)

   336   {};

   338   address entry_point()                          { return code_begin(); }

   340   bool is_alive() const                          { return true; }

   342   void verify(); // does nothing

   343   void print_on(outputStream* st) const;

   344   void print_value_on(outputStream* st) const;

   345 };

   348 //----------------------------------------------------------------------------------------------------

   349 // DeoptimizationBlob

   351 class DeoptimizationBlob: public SingletonBlob {

   352   friend class VMStructs;

   353  private:

   354   int _unpack_offset;

   355   int _unpack_with_exception;

   356   int _unpack_with_reexecution;

   358   int _unpack_with_exception_in_tls;

   360   // Creation support

   361   DeoptimizationBlob(

   362     CodeBuffer* cb,

   363     int         size,

   364     OopMapSet*  oop_maps,

   365     int         unpack_offset,

   366     int         unpack_with_exception_offset,

   367     int         unpack_with_reexecution_offset,

   368     int         frame_size

   369   );

   371  public:

   372   // Creation

   373   static DeoptimizationBlob* create(

   374     CodeBuffer* cb,

   375     OopMapSet*  oop_maps,

   376     int         unpack_offset,

   377     int         unpack_with_exception_offset,

   378     int         unpack_with_reexecution_offset,

   379     int         frame_size

   380   );

   382   // Typing

   383   bool is_deoptimization_stub() const { return true; }

   384   bool exception_address_is_unpack_entry(address pc) const {

   385     address unpack_pc = unpack();

   386     return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);

   387   }

   392   // GC for args

   393   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }

   395   // Printing

   396   void print_value_on(outputStream* st) const;

   398   address unpack() const                         { return code_begin() + _unpack_offset;           }

   399   address unpack_with_exception() const          { return code_begin() + _unpack_with_exception;   }

   400   address unpack_with_reexecution() const        { return code_begin() + _unpack_with_reexecution; }

   402   // Alternate entry point for C1 where the exception and issuing pc

   403   // are in JavaThread::_exception_oop and JavaThread::_exception_pc

   404   // instead of being in registers.  This is needed because C1 doesn't

   405   // model exception paths in a way that keeps these registers free so

   406   // there may be live values in those registers during deopt.

   407   void set_unpack_with_exception_in_tls_offset(int offset) {

   408     _unpack_with_exception_in_tls = offset;

   409     assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");

   410   }

   411   address unpack_with_exception_in_tls() const   { return code_begin() + _unpack_with_exception_in_tls; }

   412 };

   415 //----------------------------------------------------------------------------------------------------

   416 // UncommonTrapBlob (currently only used by Compiler 2)

   418 #ifdef COMPILER2

   420 class UncommonTrapBlob: public SingletonBlob {

   421   friend class VMStructs;

   422  private:

   423   // Creation support

   424   UncommonTrapBlob(

   425     CodeBuffer* cb,

   426     int         size,

   427     OopMapSet*  oop_maps,

   428     int         frame_size

   429   );

   431  public:

   432   // Creation

   433   static UncommonTrapBlob* create(

   434     CodeBuffer* cb,

   435     OopMapSet*  oop_maps,

   436     int         frame_size

   437   );

   439   // GC for args

   440   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }

   442   // Typing

   443   bool is_uncommon_trap_stub() const             { return true; }

   444 };

   447 //----------------------------------------------------------------------------------------------------

   448 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)

   450 class ExceptionBlob: public SingletonBlob {

   451   friend class VMStructs;

   452  private:

   453   // Creation support

   454   ExceptionBlob(

   455     CodeBuffer* cb,

   456     int         size,

   457     OopMapSet*  oop_maps,

   458     int         frame_size

   459   );

   461  public:

   462   // Creation

   463   static ExceptionBlob* create(

   464     CodeBuffer* cb,

   465     OopMapSet*  oop_maps,

   466     int         frame_size

   467   );

   469   // GC for args

   470   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }

   472   // Typing

   473   bool is_exception_stub() const                 { return true; }

   474 };

   475 #endif // COMPILER2

   478 //----------------------------------------------------------------------------------------------------

   479 // SafepointBlob: handles illegal_instruction exceptions during a safepoint

   481 class SafepointBlob: public SingletonBlob {

   482   friend class VMStructs;

   483  private:

   484   // Creation support

   485   SafepointBlob(

   486     CodeBuffer* cb,

   487     int         size,

   488     OopMapSet*  oop_maps,

   489     int         frame_size

   490   );

   492  public:

   493   // Creation

   494   static SafepointBlob* create(

   495     CodeBuffer* cb,

   496     OopMapSet*  oop_maps,

   497     int         frame_size

   498   );

   500   // GC for args

   501   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }

   503   // Typing

   504   bool is_safepoint_stub() const                 { return true; }

   505 };

   507 #endif // SHARE_VM_CODE_CODEBLOB_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/code/codeBlob.hpp@a5de0cc2f91c

src/share/vm/code/codeBlob.hpp