jdk8-mips64-public/hotspot: src/share/vm/memory/allocation.hpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.hpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.hpp

Thu, 27 May 2010 19:08:38 -0700

author: trims
date: Thu, 27 May 2010 19:08:38 -0700
changeset 1907: c18cbe5936b8
parent 777: 37f87013dfd8
child 2036: 126ea7725993
child 2040: 0e35fa8ebccd
permissions: -rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

 /*
  * Copyright (c) 1997, 2005, 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.
  *
  */
 #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1)
 #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1))
 #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK)
 // All classes in the virtual machine must be subclassed
 // by one of the following allocation classes:
 //
 // For objects allocated in the resource area (see resourceArea.hpp).
 // - ResourceObj
 //
 // For objects allocated in the C-heap (managed by: free & malloc).
 // - CHeapObj
 //
 // For objects allocated on the stack.
 // - StackObj
 //
 // For embedded objects.
 // - ValueObj
 //
 // For classes used as name spaces.
 // - AllStatic
 //
 // The printable subclasses are used for debugging and define virtual
 // member functions for printing. Classes that avoid allocating the
 // vtbl entries in the objects should therefore not be the printable
 // subclasses.
 //
 // The following macros and function should be used to allocate memory
 // directly in the resource area or in the C-heap:
 //
 //   NEW_RESOURCE_ARRAY(type,size)
 //   NEW_RESOURCE_OBJ(type)
 //   NEW_C_HEAP_ARRAY(type,size)
 //   NEW_C_HEAP_OBJ(type)
 //   char* AllocateHeap(size_t size, const char* name);
 //   void  FreeHeap(void* p);
 //
 // C-heap allocation can be traced using +PrintHeapAllocation.
 // malloc and free should therefore never called directly.
 // Base class for objects allocated in the C-heap.
 // In non product mode we introduce a super class for all allocation classes
 // that supports printing.
 // We avoid the superclass in product mode since some C++ compilers add
 // a word overhead for empty super classes.
 #ifdef PRODUCT
 #define ALLOCATION_SUPER_CLASS_SPEC
 #else
 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj
 class AllocatedObj {
  public:
   // Printing support
   void print() const;
   void print_value() const;
   virtual void print_on(outputStream* st) const;
   virtual void print_value_on(outputStream* st) const;
 };
 #endif
 class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
  public:
   void* operator new(size_t size);
   void  operator delete(void* p);
   void* new_array(size_t size);
 };
 // Base class for objects allocated on the stack only.
 // Calling new or delete will result in fatal error.
 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
  public:
   void* operator new(size_t size);
   void  operator delete(void* p);
 };
 // Base class for objects used as value objects.
 // Calling new or delete will result in fatal error.
 //
 // Portability note: Certain compilers (e.g. gcc) will
 // always make classes bigger if it has a superclass, even
 // if the superclass does not have any virtual methods or
 // instance fields. The HotSpot implementation relies on this
 // not to happen. So never make a ValueObj class a direct subclass
 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g.,
 // like this:
 //
 //   class A VALUE_OBJ_CLASS_SPEC {
 //     ...
 //   }
 //
 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can
 // be defined as a an empty string "".
 //
 class _ValueObj {
  public:
   void* operator new(size_t size);
   void operator delete(void* p);
 };
 // Base class for classes that constitute name spaces.
 class AllStatic {
  public:
   AllStatic()  { ShouldNotCallThis(); }
   ~AllStatic() { ShouldNotCallThis(); }
 };
 //------------------------------Chunk------------------------------------------
 // Linked list of raw memory chunks
 class Chunk: public CHeapObj {
  protected:
   Chunk*       _next;     // Next Chunk in list
   const size_t _len;      // Size of this Chunk
  public:
   void* operator new(size_t size, size_t length);
   void  operator delete(void* p);
   Chunk(size_t length);
   enum {
     // default sizes; make them slightly smaller than 2**k to guard against
     // buddy-system style malloc implementations
 #ifdef _LP64
     slack      = 40,            // [RGV] Not sure if this is right, but make it
                                 //       a multiple of 8.
 #else
     slack      = 20,            // suspected sizeof(Chunk) + internal malloc headers
 #endif
     init_size  =  1*K  - slack, // Size of first chunk
     medium_size= 10*K  - slack, // Size of medium-sized chunk
     size       = 32*K  - slack, // Default size of an Arena chunk (following the first)
     non_pool_size = init_size + 32 // An initial size which is not one of above
   };
   void chop();                  // Chop this chunk
   void next_chop();             // Chop next chunk
   static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); }
   size_t length() const         { return _len;  }
   Chunk* next() const           { return _next;  }
   void set_next(Chunk* n)       { _next = n;  }
   // Boundaries of data area (possibly unused)
   char* bottom() const          { return ((char*) this) + aligned_overhead_size();  }
   char* top()    const          { return bottom() + _len; }
   bool contains(char* p) const  { return bottom() <= p && p <= top(); }
   // Start the chunk_pool cleaner task
   static void start_chunk_pool_cleaner_task();
 };
 //------------------------------Arena------------------------------------------
 // Fast allocation of memory
 class Arena: public CHeapObj {
 protected:
   friend class ResourceMark;
   friend class HandleMark;
   friend class NoHandleMark;
   Chunk *_first;                // First chunk
   Chunk *_chunk;                // current chunk
   char *_hwm, *_max;            // High water mark and max in current chunk
   void* grow(size_t x);         // Get a new Chunk of at least size x
   NOT_PRODUCT(size_t _size_in_bytes;) // Size of arena (used for memory usage tracing)
   NOT_PRODUCT(static size_t _bytes_allocated;) // total #bytes allocated since start
   friend class AllocStats;
   debug_only(void* malloc(size_t size);)
   debug_only(void* internal_malloc_4(size_t x);)
  public:
   Arena();
   Arena(size_t init_size);
   Arena(Arena *old);
   ~Arena();
   void  destruct_contents();
   char* hwm() const             { return _hwm; }
   // Fast allocate in the arena.  Common case is: pointer test + increment.
   void* Amalloc(size_t x) {
     assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2");
     x = ARENA_ALIGN(x);
     debug_only(if (UseMallocOnly) return malloc(x);)
     NOT_PRODUCT(_bytes_allocated += x);
     if (_hwm + x > _max) {
       return grow(x);
     } else {
       char *old = _hwm;
       _hwm += x;
       return old;
     }
   }
   // Further assume size is padded out to words
   void *Amalloc_4(size_t x) {
     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
     debug_only(if (UseMallocOnly) return malloc(x);)
     NOT_PRODUCT(_bytes_allocated += x);
     if (_hwm + x > _max) {
       return grow(x);
     } else {
       char *old = _hwm;
       _hwm += x;
       return old;
     }
   }
   // Allocate with 'double' alignment. It is 8 bytes on sparc.
   // In other cases Amalloc_D() should be the same as Amalloc_4().
   void* Amalloc_D(size_t x) {
     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
     debug_only(if (UseMallocOnly) return malloc(x);)
 #if defined(SPARC) && !defined(_LP64)
 #define DALIGN_M1 7
     size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm;
     x += delta;
 #endif
     NOT_PRODUCT(_bytes_allocated += x);
     if (_hwm + x > _max) {
       return grow(x); // grow() returns a result aligned >= 8 bytes.
     } else {
       char *old = _hwm;
       _hwm += x;
 #if defined(SPARC) && !defined(_LP64)
       old += delta; // align to 8-bytes
 #endif
       return old;
     }
   }
   // Fast delete in area.  Common case is: NOP (except for storage reclaimed)
   void Afree(void *ptr, size_t size) {
 #ifdef ASSERT
     if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory
     if (UseMallocOnly) return;
 #endif
     if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
   }
   void *Arealloc( void *old_ptr, size_t old_size, size_t new_size );
   // Move contents of this arena into an empty arena
   Arena *move_contents(Arena *empty_arena);
   // Determine if pointer belongs to this Arena or not.
   bool contains( const void *ptr ) const;
   // Total of all chunks in use (not thread-safe)
   size_t used() const;
   // Total # of bytes used
   size_t size_in_bytes() const         NOT_PRODUCT({  return _size_in_bytes; }) PRODUCT_RETURN0;
   void set_size_in_bytes(size_t size)  NOT_PRODUCT({ _size_in_bytes = size;  }) PRODUCT_RETURN;
   static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2)  PRODUCT_RETURN;
   static void free_all(char** start, char** end)                                     PRODUCT_RETURN;
 private:
   // Reset this Arena to empty, access will trigger grow if necessary
   void   reset(void) {
     _first = _chunk = NULL;
     _hwm = _max = NULL;
   }
 };
 // One of the following macros must be used when allocating
 // an array or object from an arena
 #define NEW_ARENA_ARRAY(arena, type, size)\
   (type*) arena->Amalloc((size) * sizeof(type))
 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size)\
   (type*) arena->Arealloc((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) )
 #define FREE_ARENA_ARRAY(arena, type, old, size)\
   arena->Afree((char*)(old), (size) * sizeof(type))
 #define NEW_ARENA_OBJ(arena, type)\
   NEW_ARENA_ARRAY(arena, type, 1)
 //%note allocation_1
 extern char* resource_allocate_bytes(size_t size);
 extern char* resource_allocate_bytes(Thread* thread, size_t size);
 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size);
 extern void resource_free_bytes( char *old, size_t size );
 //----------------------------------------------------------------------
 // Base class for objects allocated in the resource area per default.
 // Optionally, objects may be allocated on the C heap with
 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena)
 // ResourceObj's can be allocated within other objects, but don't use
 // new or delete (allocation_type is unknown).  If new is used to allocate,
 // use delete to deallocate.
 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC {
  public:
   enum allocation_type { UNKNOWN = 0, C_HEAP, RESOURCE_AREA, ARENA };
 #ifdef ASSERT
  private:
   allocation_type _allocation;
  public:
   bool allocated_on_C_heap()    { return _allocation == C_HEAP; }
 #endif // ASSERT
  public:
   void* operator new(size_t size, allocation_type type);
   void* operator new(size_t size, Arena *arena) {
       address res = (address)arena->Amalloc(size);
       // Set allocation type in the resource object
       DEBUG_ONLY(((ResourceObj *)res)->_allocation = ARENA;)
       return res;
   }
   void* operator new(size_t size) {
       address res = (address)resource_allocate_bytes(size);
       // Set allocation type in the resource object
       DEBUG_ONLY(((ResourceObj *)res)->_allocation = RESOURCE_AREA;)
       return res;
   }
   void* operator new(size_t size, void* where, allocation_type type) {
       void* res = where;
       // Set allocation type in the resource object
       DEBUG_ONLY(((ResourceObj *)res)->_allocation = type;)
       return res;
   }
   void  operator delete(void* p);
 };
 // One of the following macros must be used when allocating an array
 // or object to determine whether it should reside in the C heap on in
 // the resource area.
 #define NEW_RESOURCE_ARRAY(type, size)\
   (type*) resource_allocate_bytes((size) * sizeof(type))
 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\
   (type*) resource_allocate_bytes(thread, (size) * sizeof(type))
 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\
   (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) )
 #define FREE_RESOURCE_ARRAY(type, old, size)\
   resource_free_bytes((char*)(old), (size) * sizeof(type))
 #define FREE_FAST(old)\
     /* nop */
 #define NEW_RESOURCE_OBJ(type)\
   NEW_RESOURCE_ARRAY(type, 1)
 #define NEW_C_HEAP_ARRAY(type, size)\
   (type*) (AllocateHeap((size) * sizeof(type), XSTR(type) " in " __FILE__))
 #define REALLOC_C_HEAP_ARRAY(type, old, size)\
   (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), XSTR(type) " in " __FILE__))
 #define FREE_C_HEAP_ARRAY(type,old) \
   FreeHeap((char*)(old))
 #define NEW_C_HEAP_OBJ(type)\
   NEW_C_HEAP_ARRAY(type, 1)
 extern bool warn_new_operator;
 // for statistics
 #ifndef PRODUCT
 class AllocStats : StackObj {
   int    start_mallocs, start_frees;
   size_t start_malloc_bytes, start_res_bytes;
  public:
   AllocStats();
   int    num_mallocs();    // since creation of receiver
   size_t alloc_bytes();
   size_t resource_bytes();
   int    num_frees();
   void   print();
 };
 #endif
 //------------------------------ReallocMark---------------------------------
 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated
 // ReallocMark, which is declared in the same scope as the reallocated
 // pointer.  Any operation that could __potentially__ cause a reallocation
 // should check the ReallocMark.
 class ReallocMark: public StackObj {
 protected:
   NOT_PRODUCT(int _nesting;)
 public:
   ReallocMark()   PRODUCT_RETURN;
   void check()    PRODUCT_RETURN;
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/allocation.hpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.hpp