/*

 * Copyright (c) 1997, 2014, 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_MEMORY_ALLOCATION_HPP

#define SHARE_VM_MEMORY_ALLOCATION_HPP

#include "runtime/globals.hpp"

#include "utilities/globalDefinitions.hpp"

#include "utilities/macros.hpp"

#ifdef COMPILER1

#include "c1/c1_globals.hpp"

#endif

#ifdef COMPILER2

#include "opto/c2_globals.hpp"

#endif

#include <new>

#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)

class AllocFailStrategy {

public:

  enum AllocFailEnum { EXIT_OOM, RETURN_NULL };

};

typedef AllocFailStrategy::AllocFailEnum AllocFailType;

// 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

//

// For classes in Metaspace (class data)

// - MetaspaceObj

//

// 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, The _OBJ variants

// of the NEW/FREE_C_HEAP macros are used for alloc/dealloc simple

// objects which are not inherited from CHeapObj, note constructor and

// destructor are not called. The preferable way to allocate objects

// is using the new operator.

//

// WARNING: The array variant must only be used for a homogenous array

// where all objects are of the exact type specified. If subtypes are

// stored in the array then must pay attention to calling destructors

// at needed.

//

//   NEW_RESOURCE_ARRAY(type, size)

//   NEW_RESOURCE_OBJ(type)

//   NEW_C_HEAP_ARRAY(type, size)

//   NEW_C_HEAP_OBJ(type, memflags)

//   FREE_C_HEAP_ARRAY(type, old)

//   FREE_C_HEAP_OBJ(objname, type, memflags)

//   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

/*

 * Memory types

 */

enum MemoryType {

  // Memory type by sub systems. It occupies lower byte.

  mtJavaHeap          = 0x00,  // Java heap

  mtClass             = 0x01,  // memory class for Java classes

  mtThread            = 0x02,  // memory for thread objects

  mtThreadStack       = 0x03,

  mtCode              = 0x04,  // memory for generated code

  mtGC                = 0x05,  // memory for GC

  mtCompiler          = 0x06,  // memory for compiler

  mtInternal          = 0x07,  // memory used by VM, but does not belong to

                                 // any of above categories, and not used for

                                 // native memory tracking

  mtOther             = 0x08,  // memory not used by VM

  mtSymbol            = 0x09,  // symbol

  mtNMT               = 0x0A,  // memory used by native memory tracking

  mtClassShared       = 0x0B,  // class data sharing

  mtChunk             = 0x0C,  // chunk that holds content of arenas

  mtTest              = 0x0D,  // Test type for verifying NMT

  mtTracing           = 0x0E,  // memory used for Tracing

  mtLogging           = 0x0F,  // memory for logging

  mtNone              = 0x10,  // undefined

  mt_number_of_types  = 0x11   // number of memory types (mtDontTrack

                                 // is not included as validate type)

};

typedef MemoryType MEMFLAGS;

#if INCLUDE_NMT

extern bool NMT_track_callsite;

#else

const bool NMT_track_callsite = false;

#endif // INCLUDE_NMT

class NativeCallStack;

template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {

 public:

                               const NativeCallStack& stack) throw();

                               throw();

                               const NativeCallStack& stack) throw();

                               throw();

  void  operator delete(void* p);

  void  operator delete [] (void* p);

};

// Base class for objects allocated on the stack only.

// Calling new or delete will result in fatal error.

class StackObj ALLOCATION_SUPER_CLASS_SPEC {

 private:

  void* operator new(size_t size) throw();

  void* operator new [](size_t size) throw();

#ifdef __IBMCPP__

 public:

#endif

  void  operator delete(void* p);

  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 {

 private:

  void* operator new(size_t size) throw();

  void  operator delete(void* p);

  void* operator new [](size_t size) throw();

  void  operator delete [](void* p);

};

// Base class for objects stored in Metaspace.

// Calling delete will result in fatal error.

//

// Do not inherit from something with a vptr because this class does

// not introduce one.  This class is used to allocate both shared read-only

// and shared read-write classes.

//

class ClassLoaderData;

class MetaspaceObj {

 public:

  bool is_metaspace_object() const;

  bool is_shared() const;

  void print_address_on(outputStream* st) const;  // nonvirtual address printing

#define METASPACE_OBJ_TYPES_DO(f) \

  f(Unknown) \

  f(Class) \

  f(Symbol) \

  f(TypeArrayU1) \

  f(TypeArrayU2) \

  f(TypeArrayU4) \

  f(TypeArrayU8) \

  f(TypeArrayOther) \

  f(Method) \

  f(ConstMethod) \

  f(MethodData) \

  f(ConstantPool) \

  f(ConstantPoolCache) \

  f(Annotation) \

  f(MethodCounters) \

  f(Deallocated)

#define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,

#define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;

  enum Type {

    // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc

    METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)

    _number_of_types

  };

  static const char * type_name(Type type) {

    switch(type) {

    METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)

    default:

      ShouldNotReachHere();

      return NULL;

    }

  }

  static MetaspaceObj::Type array_type(size_t elem_size) {

    switch (elem_size) {

    case 1: return TypeArrayU1Type;

    case 2: return TypeArrayU2Type;

    case 4: return TypeArrayU4Type;

    case 8: return TypeArrayU8Type;

    default:

      return TypeArrayOtherType;

    }

  }

  void* operator new(size_t size, ClassLoaderData* loader_data,

                     size_t word_size, bool read_only,

                     Type type, Thread* thread) throw();

                     // can't use TRAPS from this header file.

  void operator delete(void* p) { ShouldNotCallThis(); }

};

// Base class for classes that constitute name spaces.

class AllStatic {

 public:

  AllStatic()  { ShouldNotCallThis(); }

  ~AllStatic() { ShouldNotCallThis(); }

};

//------------------------------Chunk------------------------------------------

// Linked list of raw memory chunks

class Chunk: CHeapObj<mtChunk> {

  friend class VMStructs;

 protected:

  Chunk*       _next;     // Next Chunk in list

  const size_t _len;      // Size of this Chunk

 public:

  void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw();

  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

    tiny_size  =  256  - slack, // Size of first chunk (tiny)

    init_size  =  1*K  - slack, // Size of first chunk (normal aka small)

    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)); }

  static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); }

  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();

  static void clean_chunk_pool();

};

//------------------------------Arena------------------------------------------

// Fast allocation of memory

class Arena : public CHeapObj<mtNone> {

protected:

  friend class ResourceMark;

  friend class HandleMark;

  friend class NoHandleMark;

  friend class VMStructs;

  MEMFLAGS    _flags;           // Memory tracking flags

  Chunk *_first;                // First chunk

  Chunk *_chunk;                // current chunk

  char *_hwm, *_max;            // High water mark and max in current chunk

  // Get a new Chunk of at least size x

  void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);

  size_t _size_in_bytes;        // Size of arena (used for native memory tracking)

  NOT_PRODUCT(static julong _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);)

  NOT_PRODUCT(void inc_bytes_allocated(size_t x);)

  void signal_out_of_memory(size_t request, const char* whence) const;

  bool check_for_overflow(size_t request, const char* whence,

      AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const {

    if (UINTPTR_MAX - request < (uintptr_t)_hwm) {

      if (alloc_failmode == AllocFailStrategy::RETURN_NULL) {

        return false;

      }

      signal_out_of_memory(request, whence);

    }

    return true;

 }

 public:

  Arena(MEMFLAGS memflag);

  Arena(MEMFLAGS memflag, size_t init_size);

  ~Arena();

  void  destruct_contents();

  char* hwm() const             { return _hwm; }

  // new operators

  void* operator new (size_t size) throw();

  void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw();

  // dynamic memory type tagging

  void* operator new(size_t size, MEMFLAGS flags) throw();

  void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw();

  void  operator delete(void* p);

  // Fast allocate in the arena.  Common case is: pointer test + increment.

  void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {

    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);)

    if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode))

      return NULL;

    NOT_PRODUCT(inc_bytes_allocated(x);)

    if (_hwm + x > _max) {

      return grow(x, alloc_failmode);

    } else {

      char *old = _hwm;

      _hwm += x;

      return old;

    }

  }

  // Further assume size is padded out to words

  void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {

    assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );

    debug_only(if (UseMallocOnly) return malloc(x);)

    if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode))

      return NULL;

    NOT_PRODUCT(inc_bytes_allocated(x);)

    if (_hwm + x > _max) {

      return grow(x, alloc_failmode);

    } 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, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {

    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

    if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode))

      return NULL;

    NOT_PRODUCT(inc_bytes_allocated(x);)

    if (_hwm + x > _max) {

      return grow(x, alloc_failmode); // 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,

      AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);

  // 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         {  return _size_in_bytes; };

  void set_size_in_bytes(size_t size);

  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;

    set_size_in_bytes(0);

  }

};

// One of the following macros must be used when allocating

// an array or object from an arena