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

src/share/vm/code/codeBlob.hpp@a5de0cc2f91c (annotated)

src/share/vm/code/codeBlob.hpp

Mon, 18 Mar 2013 13:19:06 +0100

author: roland
date: Mon, 18 Mar 2013 13:19:06 +0100
changeset 4767: a5de0cc2f91c
parent 4107: b31471cdc53e
child 5614: 9758d9f36299
permissions: -rw-r--r--

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

 /*
  * Copyright (c) 1998, 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
  * questions.
  *
  */
 #ifndef SHARE_VM_CODE_CODEBLOB_HPP
 #define SHARE_VM_CODE_CODEBLOB_HPP
 #include "asm/codeBuffer.hpp"
 #include "compiler/oopMap.hpp"
 #include "runtime/frame.hpp"
 #include "runtime/handles.hpp"
 // CodeBlob - superclass for all entries in the CodeCache.
 //
 // Suptypes are:
 //   nmethod            : Compiled Java methods (include method that calls to native code)
 //   RuntimeStub        : Call to VM runtime methods
 //   DeoptimizationBlob : Used for deoptimizatation
 //   ExceptionBlob      : Used for stack unrolling
 //   SafepointBlob      : Used to handle illegal instruction exceptions
 //
 //
 // Layout:
 //   - header
 //   - relocation
 //   - content space
 //     - instruction space
 //   - data space
 class DeoptimizationBlob;
 class CodeBlob VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
  private:
   const char* _name;
   int        _size;                              // total size of CodeBlob in bytes
   int        _header_size;                       // size of header (depends on subclass)
   int        _relocation_size;                   // size of relocation
   int        _content_offset;                    // offset to where content region begins (this includes consts, insts, stubs)
   int        _code_offset;                       // offset to where instructions region begins (this includes insts, stubs)
   int        _frame_complete_offset;             // instruction offsets in [0.._frame_complete_offset) have
                                                  // not finished setting up their frame. Beware of pc's in
                                                  // that range. There is a similar range(s) on returns
                                                  // which we don't detect.
   int        _data_offset;                       // offset to where data region begins
   int        _frame_size;                        // size of stack frame
   OopMapSet* _oop_maps;                          // OopMap for this CodeBlob
   CodeStrings _strings;
  public:
   // Returns the space needed for CodeBlob
   static unsigned int allocation_size(CodeBuffer* cb, int header_size);
   // Creation
   // a) simple CodeBlob
   // frame_complete is the offset from the beginning of the instructions
   // to where the frame setup (from stackwalk viewpoint) is complete.
   CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
   // b) full CodeBlob
   CodeBlob(
     const char* name,
     CodeBuffer* cb,
     int         header_size,
     int         size,
     int         frame_complete,
     int         frame_size,
     OopMapSet*  oop_maps
   );
   // Deletion
   void flush();
   // Typing
   virtual bool is_buffer_blob() const            { return false; }
   virtual bool is_nmethod() const                { return false; }
   virtual bool is_runtime_stub() const           { return false; }
   virtual bool is_deoptimization_stub() const    { return false; }
   virtual bool is_uncommon_trap_stub() const     { return false; }
   virtual bool is_exception_stub() const         { return false; }
   virtual bool is_safepoint_stub() const              { return false; }
   virtual bool is_adapter_blob() const                { return false; }
   virtual bool is_method_handles_adapter_blob() const { return false; }
   virtual bool is_compiled_by_c2() const         { return false; }
   virtual bool is_compiled_by_c1() const         { return false; }
   // Casting
   nmethod* as_nmethod_or_null()                  { return is_nmethod() ? (nmethod*) this : NULL; }
   // Boundaries
   address    header_begin() const                { return (address)    this; }
   address    header_end() const                  { return ((address)   this) + _header_size; };
   relocInfo* relocation_begin() const            { return (relocInfo*) header_end(); };
   relocInfo* relocation_end() const              { return (relocInfo*)(header_end()   + _relocation_size); }
   address    content_begin() const               { return (address)    header_begin() + _content_offset; }
   address    content_end() const                 { return (address)    header_begin() + _data_offset; }
   address    code_begin() const                  { return (address)    header_begin() + _code_offset; }
   address    code_end() const                    { return (address)    header_begin() + _data_offset; }
   address    data_begin() const                  { return (address)    header_begin() + _data_offset; }
   address    data_end() const                    { return (address)    header_begin() + _size; }
   // Offsets
   int relocation_offset() const                  { return _header_size; }
   int content_offset() const                     { return _content_offset; }
   int code_offset() const                        { return _code_offset; }
   int data_offset() const                        { return _data_offset; }
   // Sizes
   int size() const                               { return _size; }
   int header_size() const                        { return _header_size; }
   int relocation_size() const                    { return (address) relocation_end() - (address) relocation_begin(); }
   int content_size() const                       { return           content_end()    -           content_begin();    }
   int code_size() const                          { return           code_end()       -           code_begin();       }
   int data_size() const                          { return           data_end()       -           data_begin();       }
   // Containment
   bool blob_contains(address addr) const         { return header_begin()       <= addr && addr < data_end();       }
   bool relocation_contains(relocInfo* addr) const{ return relocation_begin()   <= addr && addr < relocation_end(); }
   bool content_contains(address addr) const      { return content_begin()      <= addr && addr < content_end();    }
   bool code_contains(address addr) const         { return code_begin()         <= addr && addr < code_end();       }
   bool data_contains(address addr) const         { return data_begin()         <= addr && addr < data_end();       }
   bool contains(address addr) const              { return content_contains(addr); }
   bool is_frame_complete_at(address addr) const  { return code_contains(addr) &&
                                                           addr >= code_begin() + _frame_complete_offset; }
   // CodeCache support: really only used by the nmethods, but in order to get
   // asserts and certain bookkeeping to work in the CodeCache they are defined
   // virtual here.
   virtual bool is_zombie() const                 { return false; }
   virtual bool is_locked_by_vm() const           { return false; }
   virtual bool is_unloaded() const               { return false; }
   virtual bool is_not_entrant() const            { return false; }
   // GC support
   virtual bool is_alive() const                  = 0;
   // OopMap for frame
   OopMapSet* oop_maps() const                    { return _oop_maps; }
   void set_oop_maps(OopMapSet* p);
   OopMap* oop_map_for_return_address(address return_address);
   virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { ShouldNotReachHere(); }
   // Frame support
   int  frame_size() const                        { return _frame_size; }
   void set_frame_size(int size)                  { _frame_size = size; }
   // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
   virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; }
   // Naming
   const char* name() const                       { return _name; }
   void set_name(const char* name)                { _name = name; }
   // Debugging
   virtual void verify();
   void print() const                             { print_on(tty); }
   virtual void print_on(outputStream* st) const;
   virtual void print_value_on(outputStream* st) const;
   // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
   static void trace_new_stub(CodeBlob* blob, const char* name1, const char* name2 = "");
   // Print the comment associated with offset on stream, if there is one
   virtual void print_block_comment(outputStream* stream, address block_begin) const {
     intptr_t offset = (intptr_t)(block_begin - code_begin());
     _strings.print_block_comment(stream, offset);
   }
   // Transfer ownership of comments to this CodeBlob
   void set_strings(CodeStrings& strings) {
     _strings.assign(strings);
   }
 };
 //----------------------------------------------------------------------------------------------------
 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
 class BufferBlob: public CodeBlob {
   friend class VMStructs;
   friend class AdapterBlob;
   friend class MethodHandlesAdapterBlob;
  private:
   // Creation support
   BufferBlob(const char* name, int size);
   BufferBlob(const char* name, int size, CodeBuffer* cb);
   void* operator new(size_t s, unsigned size);
  public:
   // Creation
   static BufferBlob* create(const char* name, int buffer_size);
   static BufferBlob* create(const char* name, CodeBuffer* cb);
   static void free(BufferBlob* buf);
   // Typing
   virtual bool is_buffer_blob() const            { return true; }
   // GC/Verification support
   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
   bool is_alive() const                          { return true; }
   void verify();
   void print_on(outputStream* st) const;
   void print_value_on(outputStream* st) const;
 };
 //----------------------------------------------------------------------------------------------------
 // AdapterBlob: used to hold C2I/I2C adapters
 class AdapterBlob: public BufferBlob {
 private:
   AdapterBlob(int size, CodeBuffer* cb);
 public:
   // Creation
   static AdapterBlob* create(CodeBuffer* cb);
   // Typing
   virtual bool is_adapter_blob() const { return true; }
 };
 //----------------------------------------------------------------------------------------------------
 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
 class MethodHandlesAdapterBlob: public BufferBlob {
 private:
   MethodHandlesAdapterBlob(int size)                 : BufferBlob("MethodHandles adapters", size) {}
   MethodHandlesAdapterBlob(int size, CodeBuffer* cb) : BufferBlob("MethodHandles adapters", size, cb) {}
 public:
   // Creation
   static MethodHandlesAdapterBlob* create(int buffer_size);
   // Typing
   virtual bool is_method_handles_adapter_blob() const { return true; }
 };
 //----------------------------------------------------------------------------------------------------
 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
 class RuntimeStub: public CodeBlob {
   friend class VMStructs;
  private:
   bool        _caller_must_gc_arguments;
   // Creation support
   RuntimeStub(
     const char* name,
     CodeBuffer* cb,
     int         size,
     int         frame_complete,
     int         frame_size,
     OopMapSet*  oop_maps,
     bool        caller_must_gc_arguments
   );
   void* operator new(size_t s, unsigned size);
  public:
   // Creation
   static RuntimeStub* new_runtime_stub(
     const char* stub_name,
     CodeBuffer* cb,
     int         frame_complete,
     int         frame_size,
     OopMapSet*  oop_maps,
     bool        caller_must_gc_arguments
   );
   // Typing
   bool is_runtime_stub() const                   { return true; }
   // GC support
   bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
   address entry_point()                          { return code_begin(); }
   // GC/Verification support
   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
   bool is_alive() const                          { return true; }
   void verify();
   void print_on(outputStream* st) const;
   void print_value_on(outputStream* st) const;
 };
 //----------------------------------------------------------------------------------------------------
 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
 class SingletonBlob: public CodeBlob {
   friend class VMStructs;
  protected:
   void* operator new(size_t s, unsigned size);
  public:
    SingletonBlob(
      const char* name,
      CodeBuffer* cb,
      int         header_size,
      int         size,
      int         frame_size,
      OopMapSet*  oop_maps
    )
    : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
   {};
   address entry_point()                          { return code_begin(); }
   bool is_alive() const                          { return true; }
   void verify(); // does nothing
   void print_on(outputStream* st) const;
   void print_value_on(outputStream* st) const;
 };
 //----------------------------------------------------------------------------------------------------
 // DeoptimizationBlob
 class DeoptimizationBlob: public SingletonBlob {
   friend class VMStructs;
  private:
   int _unpack_offset;
   int _unpack_with_exception;
   int _unpack_with_reexecution;
   int _unpack_with_exception_in_tls;
   // Creation support
   DeoptimizationBlob(
     CodeBuffer* cb,
     int         size,
     OopMapSet*  oop_maps,
     int         unpack_offset,
     int         unpack_with_exception_offset,
     int         unpack_with_reexecution_offset,
     int         frame_size
   );
  public:
   // Creation
   static DeoptimizationBlob* create(
     CodeBuffer* cb,
     OopMapSet*  oop_maps,
     int         unpack_offset,
     int         unpack_with_exception_offset,
     int         unpack_with_reexecution_offset,
     int         frame_size
   );
   // Typing
   bool is_deoptimization_stub() const { return true; }
   bool exception_address_is_unpack_entry(address pc) const {
     address unpack_pc = unpack();
     return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
   }
   // GC for args
   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
   // Printing
   void print_value_on(outputStream* st) const;
   address unpack() const                         { return code_begin() + _unpack_offset;           }
   address unpack_with_exception() const          { return code_begin() + _unpack_with_exception;   }
   address unpack_with_reexecution() const        { return code_begin() + _unpack_with_reexecution; }
   // Alternate entry point for C1 where the exception and issuing pc
   // are in JavaThread::_exception_oop and JavaThread::_exception_pc
   // instead of being in registers.  This is needed because C1 doesn't
   // model exception paths in a way that keeps these registers free so
   // there may be live values in those registers during deopt.
   void set_unpack_with_exception_in_tls_offset(int offset) {
     _unpack_with_exception_in_tls = offset;
     assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
   }
   address unpack_with_exception_in_tls() const   { return code_begin() + _unpack_with_exception_in_tls; }
 };
 //----------------------------------------------------------------------------------------------------
 // UncommonTrapBlob (currently only used by Compiler 2)
 #ifdef COMPILER2
 class UncommonTrapBlob: public SingletonBlob {
   friend class VMStructs;
  private:
   // Creation support
   UncommonTrapBlob(
     CodeBuffer* cb,
     int         size,
     OopMapSet*  oop_maps,
     int         frame_size
   );
  public:
   // Creation
   static UncommonTrapBlob* create(
     CodeBuffer* cb,
     OopMapSet*  oop_maps,
     int         frame_size
   );
   // GC for args
   void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
   // Typing
   bool is_uncommon_trap_stub() const             { return true; }
 };
 //----------------------------------------------------------------------------------------------------
 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
 class ExceptionBlob: public SingletonBlob {
   friend class VMStructs;
  private:
   // Creation support
   ExceptionBlob(
     CodeBuffer* cb,
     int         size,
     OopMapSet*  oop_maps,
     int         frame_size
   );
  public:
   // Creation
   static ExceptionBlob* create(
     CodeBuffer* cb,
     OopMapSet*  oop_maps,
     int         frame_size
   );
   // GC for args
   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
   // Typing
   bool is_exception_stub() const                 { return true; }
 };
 #endif // COMPILER2
 //----------------------------------------------------------------------------------------------------
 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
 class SafepointBlob: public SingletonBlob {
   friend class VMStructs;
  private:
   // Creation support
   SafepointBlob(
     CodeBuffer* cb,
     int         size,
     OopMapSet*  oop_maps,
     int         frame_size
   );
  public:
   // Creation
   static SafepointBlob* create(
     CodeBuffer* cb,
     OopMapSet*  oop_maps,
     int         frame_size
   );
   // GC for args
   void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
   // Typing
   bool is_safepoint_stub() const                 { return true; }
 };
 #endif // SHARE_VM_CODE_CODEBLOB_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/code/codeBlob.hpp@a5de0cc2f91c (annotated)

src/share/vm/code/codeBlob.hpp