1 /*
   2  * Copyright (c) 1997, 2013, 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  */
  24 
  25 #ifndef SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP
  26 #define SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP
  27 
  28 #include "runtime/atomic.inline.hpp"
  29 #include "runtime/os.hpp"
  30 
  31 // Explicit C-heap memory management
  32 
  33 void trace_heap_malloc(size_t size, const char* name, void *p);
  34 void trace_heap_free(void *p);
  35 
  36 #ifndef PRODUCT
  37 // Increments unsigned long value for statistics (not atomic on MP).
  38 inline void inc_stat_counter(volatile julong* dest, julong add_value) {
  39 #if defined(SPARC) || defined(X86)
  40   // Sparc and X86 have atomic jlong (8 bytes) instructions
  41   julong value = Atomic::load((volatile jlong*)dest);
  42   value += add_value;
  43   Atomic::store((jlong)value, (volatile jlong*)dest);
  44 #else
  45   // possible word-tearing during load/store
  46   *dest += add_value;
  47 #endif
  48 }
  49 #endif
  50 
  51 // allocate using malloc; will fail if no memory available
  52 inline char* AllocateHeap(size_t size, MEMFLAGS flags, address pc = 0,
  53     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
  54   if (pc == 0) {
  55     pc = CURRENT_PC;
  56   }
  57   char* p = (char*) os::malloc(size, flags, pc);
  58   #ifdef ASSERT
  59   if (PrintMallocFree) trace_heap_malloc(size, "AllocateHeap", p);
  60   #endif
  61   if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) vm_exit_out_of_memory(size, "AllocateHeap");
  62   return p;
  63 }
  64 
  65 inline char* ReallocateHeap(char *old, size_t size, MEMFLAGS flags,
  66     AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {
  67   char* p = (char*) os::realloc(old, size, flags, CURRENT_PC);
  68   #ifdef ASSERT
  69   if (PrintMallocFree) trace_heap_malloc(size, "ReallocateHeap", p);
  70   #endif
  71   if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) vm_exit_out_of_memory(size, "ReallocateHeap");
  72   return p;
  73 }
  74 
  75 inline void FreeHeap(void* p, MEMFLAGS memflags = mtInternal) {
  76   #ifdef ASSERT
  77   if (PrintMallocFree) trace_heap_free(p);
  78   #endif
  79   os::free(p, memflags);
  80 }
  81 
  82 
  83 template <MEMFLAGS F> void* CHeapObj<F>::operator new(size_t size,
  84       address caller_pc){
  85 #ifdef ASSERT
  86     void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC));
  87     if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);
  88     return p;
  89 #else
  90     return (void *) AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC));
  91 #endif
  92   }
  93 
  94 template <MEMFLAGS F> void* CHeapObj<F>::operator new (size_t size,
  95   const std::nothrow_t&  nothrow_constant, address caller_pc) {
  96 #ifdef ASSERT
  97   void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC),
  98       AllocFailStrategy::RETURN_NULL);
  99     if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);
 100     return p;
 101 #else
 102   return (void *) AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC),
 103       AllocFailStrategy::RETURN_NULL);
 104 #endif
 105 }
 106 
 107 template <MEMFLAGS F> void CHeapObj<F>::operator delete(void* p){
 108    FreeHeap(p, F);
 109 }
 110 
 111 template <class E, MEMFLAGS F>
 112 E* ArrayAllocator<E, F>::allocate(size_t length) {
 113   assert(_addr == NULL, "Already in use");
 114 
 115   _size = sizeof(E) * length;
 116   _use_malloc = _size < ArrayAllocatorMallocLimit;
 117 
 118   if (_use_malloc) {
 119     _addr = AllocateHeap(_size, F);
 120     if (_addr == NULL && _size >=  (size_t)os::vm_allocation_granularity()) {
 121       // malloc failed let's try with mmap instead
 122       _use_malloc = false;
 123     } else {
 124       return (E*)_addr;
 125     }
 126   }
 127 
 128   int alignment = os::vm_allocation_granularity();
 129   _size = align_size_up(_size, alignment);
 130 
 131   _addr = os::reserve_memory(_size, NULL, alignment);
 132   if (_addr == NULL) {
 133     vm_exit_out_of_memory(_size, "Allocator (reserve)");
 134   }
 135 
 136   bool success = os::commit_memory(_addr, _size, false /* executable */);
 137   if (!success) {
 138     vm_exit_out_of_memory(_size, "Allocator (commit)");
 139   }
 140 
 141   return (E*)_addr;
 142 }
 143 
 144 template<class E, MEMFLAGS F>
 145 void ArrayAllocator<E, F>::free() {
 146   if (_addr != NULL) {
 147     if (_use_malloc) {
 148       FreeHeap(_addr, F);
 149     } else {
 150       os::release_memory(_addr, _size);
 151     }
 152     _addr = NULL;
 153   }
 154 }
 155 
 156 #endif // SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP