jdk8-mips64-public/hotspot: src/share/vm/memory/allocation.cpp@b985cbb00e68 (annotated)

src/share/vm/memory/allocation.cpp@b985cbb00e68 (annotated)

src/share/vm/memory/allocation.cpp

Mon, 12 Aug 2019 18:30:40 +0300

author: apetushkov
date: Mon, 12 Aug 2019 18:30:40 +0300
changeset 9858: b985cbb00e68
parent 9507: 7e72702243a4
child 9572: 624a0741915c
permissions: -rw-r--r--

8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens

 /*
  * Copyright (c) 1997, 2018, 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.
  *
  */
 #include "precompiled.hpp"
 #include "memory/allocation.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.hpp"
 #include "runtime/atomic.hpp"
 #include "runtime/os.hpp"
 #include "runtime/task.hpp"
 #include "runtime/threadCritical.hpp"
 #include "services/memTracker.hpp"
 #include "utilities/ostream.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_aix
 # include "os_aix.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_bsd.inline.hpp"
 #endif
 void* StackObj::operator new(size_t size)     throw() { ShouldNotCallThis(); return 0; }
 void  StackObj::operator delete(void* p)              { ShouldNotCallThis(); }
 void* StackObj::operator new [](size_t size)  throw() { ShouldNotCallThis(); return 0; }
 void  StackObj::operator delete [](void* p)           { ShouldNotCallThis(); }
 void* _ValueObj::operator new(size_t size)    throw() { ShouldNotCallThis(); return 0; }
 void  _ValueObj::operator delete(void* p)             { ShouldNotCallThis(); }
 void* _ValueObj::operator new [](size_t size) throw() { ShouldNotCallThis(); return 0; }
 void  _ValueObj::operator delete [](void* p)          { ShouldNotCallThis(); }
 void* MetaspaceObj::operator new(size_t size, ClassLoaderData* loader_data,
                                  size_t word_size, bool read_only,
                                  MetaspaceObj::Type type, TRAPS) throw() {
   // Klass has it's own operator new
   return Metaspace::allocate(loader_data, word_size, read_only, type, THREAD);
 }
 bool MetaspaceObj::is_shared() const {
   return MetaspaceShared::is_in_shared_space(this);
 }
 bool MetaspaceObj::is_metaspace_object() const {
   return Metaspace::contains((void*)this);
 }
 void MetaspaceObj::print_address_on(outputStream* st) const {
   st->print(" {" INTPTR_FORMAT "}", p2i(this));
 }
 void* ResourceObj::operator new(size_t size, allocation_type type, MEMFLAGS flags) throw() {
   address res = NULL;
   switch (type) {
    case C_HEAP:
     res = (address)AllocateHeap(size, flags, CALLER_PC);
     DEBUG_ONLY(set_allocation_type(res, C_HEAP);)
     break;
    case RESOURCE_AREA:
     // new(size) sets allocation type RESOURCE_AREA.
     res = (address)operator new(size);
     break;
    default:
     ShouldNotReachHere();
   }
   return res;
 }
 void* ResourceObj::operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw() {
   return (address) operator new(size, type, flags);
 }
 void* ResourceObj::operator new(size_t size, const std::nothrow_t&  nothrow_constant,
     allocation_type type, MEMFLAGS flags) throw() {
   // should only call this with std::nothrow, use other operator new() otherwise
   address res = NULL;
   switch (type) {
    case C_HEAP:
     res = (address)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL);
     DEBUG_ONLY(if (res!= NULL) set_allocation_type(res, C_HEAP);)
     break;
    case RESOURCE_AREA:
     // new(size) sets allocation type RESOURCE_AREA.
     res = (address)operator new(size, std::nothrow);
     break;
    default:
     ShouldNotReachHere();
   }
   return res;
 }
 void* ResourceObj::operator new [](size_t size, const std::nothrow_t&  nothrow_constant,
     allocation_type type, MEMFLAGS flags) throw() {
   return (address)operator new(size, nothrow_constant, type, flags);
 }
 void ResourceObj::operator delete(void* p) {
   assert(((ResourceObj *)p)->allocated_on_C_heap(),
          "delete only allowed for C_HEAP objects");
   DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;)
   FreeHeap(p);
 }
 void ResourceObj::operator delete [](void* p) {
   operator delete(p);
 }
 #ifdef ASSERT
 void ResourceObj::set_allocation_type(address res, allocation_type type) {
     // Set allocation type in the resource object
     uintptr_t allocation = (uintptr_t)res;
     assert((allocation & allocation_mask) == 0, err_msg("address should be aligned to 4 bytes at least: " INTPTR_FORMAT, p2i(res)));
     assert(type <= allocation_mask, "incorrect allocation type");
     ResourceObj* resobj = (ResourceObj *)res;
     resobj->_allocation_t[0] = ~(allocation + type);
     if (type != STACK_OR_EMBEDDED) {
       // Called from operator new() and CollectionSetChooser(),
       // set verification value.
       resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type;
     }
 }
 ResourceObj::allocation_type ResourceObj::get_allocation_type() const {
     assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object");
     return (allocation_type)((~_allocation_t[0]) & allocation_mask);
 }
 bool ResourceObj::is_type_set() const {
     allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask);
     return get_allocation_type()  == type &&
            (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]);
 }
 ResourceObj::ResourceObj() { // default constructor
     if (~(_allocation_t[0] | allocation_mask) != (uintptr_t)this) {
       // Operator new() is not called for allocations
       // on stack and for embedded objects.
       set_allocation_type((address)this, STACK_OR_EMBEDDED);
     } else if (allocated_on_stack()) { // STACK_OR_EMBEDDED
       // For some reason we got a value which resembles
       // an embedded or stack object (operator new() does not
       // set such type). Keep it since it is valid value
       // (even if it was garbage).
       // Ignore garbage in other fields.
     } else if (is_type_set()) {
       // Operator new() was called and type was set.
       assert(!allocated_on_stack(),
              err_msg("not embedded or stack, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
                      p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]));
     } else {
       // Operator new() was not called.
       // Assume that it is embedded or stack object.
       set_allocation_type((address)this, STACK_OR_EMBEDDED);
     }
     _allocation_t[1] = 0; // Zap verification value
 }
 ResourceObj::ResourceObj(const ResourceObj& r) { // default copy constructor
     // Used in ClassFileParser::parse_constant_pool_entries() for ClassFileStream.
     // Note: garbage may resembles valid value.
     assert(~(_allocation_t[0] | allocation_mask) != (uintptr_t)this || !is_type_set(),
            err_msg("embedded or stack only, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
                    p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]));
     set_allocation_type((address)this, STACK_OR_EMBEDDED);
     _allocation_t[1] = 0; // Zap verification value
 }
 ResourceObj& ResourceObj::operator=(const ResourceObj& r) { // default copy assignment
     // Used in InlineTree::ok_to_inline() for WarmCallInfo.
     assert(allocated_on_stack(),
            err_msg("copy only into local, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")",
                    p2i(this), get_allocation_type(), _allocation_t[0], _allocation_t[1]));
     // Keep current _allocation_t value;
     return *this;
 }
 ResourceObj::~ResourceObj() {
     // allocated_on_C_heap() also checks that encoded (in _allocation) address == this.
     if (!allocated_on_C_heap()) { // ResourceObj::delete() will zap _allocation for C_heap.
       _allocation_t[0] = (uintptr_t)badHeapOopVal; // zap type
     }
 }
 #endif // ASSERT
 void trace_heap_malloc(size_t size, const char* name, void* p) {
   // A lock is not needed here - tty uses a lock internally
   tty->print_cr("Heap malloc " INTPTR_FORMAT " " SIZE_FORMAT " %s", p2i(p), size, name == NULL ? "" : name);
 }
 void trace_heap_free(void* p) {
   // A lock is not needed here - tty uses a lock internally
   tty->print_cr("Heap free   " INTPTR_FORMAT, p2i(p));
 }
 //--------------------------------------------------------------------------------------
 // ChunkPool implementation
 // MT-safe pool of chunks to reduce malloc/free thrashing
 // NB: not using Mutex because pools are used before Threads are initialized
 class ChunkPool: public CHeapObj<mtInternal> {
   Chunk*       _first;        // first cached Chunk; its first word points to next chunk
   size_t       _num_chunks;   // number of unused chunks in pool
   size_t       _num_used;     // number of chunks currently checked out
   const size_t _size;         // size of each chunk (must be uniform)
   // Our four static pools
   static ChunkPool* _large_pool;
   static ChunkPool* _medium_pool;
   static ChunkPool* _small_pool;
   static ChunkPool* _tiny_pool;
   // return first element or null
   void* get_first() {
     Chunk* c = _first;
     if (_first) {
       _first = _first->next();
       _num_chunks--;
     }
     return c;
   }
  public:
   // All chunks in a ChunkPool has the same size
    ChunkPool(size_t size) : _size(size) { _first = NULL; _num_chunks = _num_used = 0; }
   // Allocate a new chunk from the pool (might expand the pool)
   _NOINLINE_ void* allocate(size_t bytes, AllocFailType alloc_failmode) {
     assert(bytes == _size, "bad size");
     void* p = NULL;
     // No VM lock can be taken inside ThreadCritical lock, so os::malloc
     // should be done outside ThreadCritical lock due to NMT
     { ThreadCritical tc;
       _num_used++;
       p = get_first();
     }
     if (p == NULL) p = os::malloc(bytes, mtChunk, CURRENT_PC);
     if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
       vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "ChunkPool::allocate");
     }
     return p;
   }
   // Return a chunk to the pool
   void free(Chunk* chunk) {
     assert(chunk->length() + Chunk::aligned_overhead_size() == _size, "bad size");
     ThreadCritical tc;
     _num_used--;
     // Add chunk to list
     chunk->set_next(_first);
     _first = chunk;
     _num_chunks++;
   }
   // Prune the pool
   void free_all_but(size_t n) {
     Chunk* cur = NULL;
     Chunk* next;
     {
     // if we have more than n chunks, free all of them
     ThreadCritical tc;
     if (_num_chunks > n) {
       // free chunks at end of queue, for better locality
         cur = _first;
       for (size_t i = 0; i < (n - 1) && cur != NULL; i++) cur = cur->next();
       if (cur != NULL) {
           next = cur->next();
         cur->set_next(NULL);
         cur = next;
           _num_chunks = n;
         }
       }
     }
     // Free all remaining chunks, outside of ThreadCritical
     // to avoid deadlock with NMT
         while(cur != NULL) {
           next = cur->next();
       os::free(cur, mtChunk);
           cur = next;
         }
       }
   // Accessors to preallocated pool's
   static ChunkPool* large_pool()  { assert(_large_pool  != NULL, "must be initialized"); return _large_pool;  }
   static ChunkPool* medium_pool() { assert(_medium_pool != NULL, "must be initialized"); return _medium_pool; }
   static ChunkPool* small_pool()  { assert(_small_pool  != NULL, "must be initialized"); return _small_pool;  }
   static ChunkPool* tiny_pool()   { assert(_tiny_pool   != NULL, "must be initialized"); return _tiny_pool;   }
   static void initialize() {
     _large_pool  = new ChunkPool(Chunk::size        + Chunk::aligned_overhead_size());
     _medium_pool = new ChunkPool(Chunk::medium_size + Chunk::aligned_overhead_size());
     _small_pool  = new ChunkPool(Chunk::init_size   + Chunk::aligned_overhead_size());
     _tiny_pool   = new ChunkPool(Chunk::tiny_size   + Chunk::aligned_overhead_size());
   }
   static void clean() {
     enum { BlocksToKeep = 5 };
      _tiny_pool->free_all_but(BlocksToKeep);
      _small_pool->free_all_but(BlocksToKeep);
      _medium_pool->free_all_but(BlocksToKeep);
      _large_pool->free_all_but(BlocksToKeep);
   }
 };
 ChunkPool* ChunkPool::_large_pool  = NULL;
 ChunkPool* ChunkPool::_medium_pool = NULL;
 ChunkPool* ChunkPool::_small_pool  = NULL;
 ChunkPool* ChunkPool::_tiny_pool   = NULL;
 void chunkpool_init() {
   ChunkPool::initialize();
 }
 void
 Chunk::clean_chunk_pool() {
   ChunkPool::clean();
 }
 //--------------------------------------------------------------------------------------
 // ChunkPoolCleaner implementation
 //
 class ChunkPoolCleaner : public PeriodicTask {
   enum { CleaningInterval = 5000 };      // cleaning interval in ms
  public:
    ChunkPoolCleaner() : PeriodicTask(CleaningInterval) {}
    void task() {
      ChunkPool::clean();
    }
 };
 //--------------------------------------------------------------------------------------
 // Chunk implementation
 void* Chunk::operator new (size_t requested_size, AllocFailType alloc_failmode, size_t length) throw() {
   // requested_size is equal to sizeof(Chunk) but in order for the arena
   // allocations to come out aligned as expected the size must be aligned
   // to expected arena alignment.
   // expect requested_size but if sizeof(Chunk) doesn't match isn't proper size we must align it.
   assert(ARENA_ALIGN(requested_size) == aligned_overhead_size(), "Bad alignment");
   size_t bytes = ARENA_ALIGN(requested_size) + length;
   switch (length) {
    case Chunk::size:        return ChunkPool::large_pool()->allocate(bytes, alloc_failmode);
    case Chunk::medium_size: return ChunkPool::medium_pool()->allocate(bytes, alloc_failmode);
    case Chunk::init_size:   return ChunkPool::small_pool()->allocate(bytes, alloc_failmode);
    case Chunk::tiny_size:   return ChunkPool::tiny_pool()->allocate(bytes, alloc_failmode);
    default: {
      void* p = os::malloc(bytes, mtChunk, CALLER_PC);
      if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) {
        vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "Chunk::new");
      }
      return p;
    }
   }
 }
 void Chunk::operator delete(void* p) {
   Chunk* c = (Chunk*)p;
   switch (c->length()) {
    case Chunk::size:        ChunkPool::large_pool()->free(c); break;
    case Chunk::medium_size: ChunkPool::medium_pool()->free(c); break;
    case Chunk::init_size:   ChunkPool::small_pool()->free(c); break;
    case Chunk::tiny_size:   ChunkPool::tiny_pool()->free(c); break;
    default:                 os::free(c, mtChunk);
   }
 }
 Chunk::Chunk(size_t length) : _len(length) {
   _next = NULL;         // Chain on the linked list
 }
 void Chunk::chop() {
   Chunk *k = this;
   while( k ) {
     Chunk *tmp = k->next();
     // clear out this chunk (to detect allocation bugs)
     if (ZapResourceArea) memset(k->bottom(), badResourceValue, k->length());
     delete k;                   // Free chunk (was malloc'd)
     k = tmp;
   }
 }
 void Chunk::next_chop() {
   _next->chop();
   _next = NULL;
 }
 void Chunk::start_chunk_pool_cleaner_task() {
 #ifdef ASSERT
   static bool task_created = false;
   assert(!task_created, "should not start chuck pool cleaner twice");
   task_created = true;
 #endif
   ChunkPoolCleaner* cleaner = new ChunkPoolCleaner();
   cleaner->enroll();
 }
 //------------------------------Arena------------------------------------------
 Arena::Arena(MEMFLAGS flag, size_t init_size) : _flags(flag), _size_in_bytes(0)  {
   size_t round_size = (sizeof (char *)) - 1;
   init_size = (init_size+round_size) & ~round_size;
   _first = _chunk = new (AllocFailStrategy::EXIT_OOM, init_size) Chunk(init_size);
   _hwm = _chunk->bottom();      // Save the cached hwm, max
   _max = _chunk->top();
   MemTracker::record_new_arena(flag);
   set_size_in_bytes(init_size);
 }
 Arena::Arena(MEMFLAGS flag) : _flags(flag), _size_in_bytes(0) {
   _first = _chunk = new (AllocFailStrategy::EXIT_OOM, Chunk::init_size) Chunk(Chunk::init_size);
   _hwm = _chunk->bottom();      // Save the cached hwm, max
   _max = _chunk->top();
   MemTracker::record_new_arena(flag);
   set_size_in_bytes(Chunk::init_size);
 }
 Arena *Arena::move_contents(Arena *copy) {
   copy->destruct_contents();
   copy->_chunk = _chunk;
   copy->_hwm   = _hwm;
   copy->_max   = _max;
   copy->_first = _first;
   // workaround rare racing condition, which could double count
   // the arena size by native memory tracking
   size_t size = size_in_bytes();
   set_size_in_bytes(0);
   copy->set_size_in_bytes(size);
   // Destroy original arena
   reset();
   return copy;            // Return Arena with contents
 }
 Arena::~Arena() {
   destruct_contents();
   MemTracker::record_arena_free(_flags);
 }
 void* Arena::operator new(size_t size) throw() {
   assert(false, "Use dynamic memory type binding");
   return NULL;
 }
 void* Arena::operator new (size_t size, const std::nothrow_t&  nothrow_constant) throw() {
   assert(false, "Use dynamic memory type binding");
   return NULL;
 }
   // dynamic memory type binding
 void* Arena::operator new(size_t size, MEMFLAGS flags) throw() {
 #ifdef ASSERT
   void* p = (void*)AllocateHeap(size, flags, CALLER_PC);
   if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p);
   return p;
 #else
   return (void *) AllocateHeap(size, flags, CALLER_PC);
 #endif
 }
 void* Arena::operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw() {
 #ifdef ASSERT
   void* p = os::malloc(size, flags, CALLER_PC);
   if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p);
   return p;
 #else
   return os::malloc(size, flags, CALLER_PC);
 #endif
 }
 void Arena::operator delete(void* p) {
   FreeHeap(p);
 }
 // Destroy this arenas contents and reset to empty
 void Arena::destruct_contents() {
   if (UseMallocOnly && _first != NULL) {
     char* end = _first->next() ? _first->top() : _hwm;
     free_malloced_objects(_first, _first->bottom(), end, _hwm);
   }
   // reset size before chop to avoid a rare racing condition
   // that can have total arena memory exceed total chunk memory
   set_size_in_bytes(0);
   _first->chop();
   reset();
 }
 // This is high traffic method, but many calls actually don't
 // change the size
 void Arena::set_size_in_bytes(size_t size) {
   if (_size_in_bytes != size) {
     long delta = (long)(size - size_in_bytes());
     _size_in_bytes = size;
     MemTracker::record_arena_size_change(delta, _flags);
   }
 }
 // Total of all Chunks in arena
 size_t Arena::used() const {
   size_t sum = _chunk->length() - (_max-_hwm); // Size leftover in this Chunk
   register Chunk *k = _first;
   while( k != _chunk) {         // Whilst have Chunks in a row
     sum += k->length();         // Total size of this Chunk
     k = k->next();              // Bump along to next Chunk
   }
   return sum;                   // Return total consumed space.
 }
 void Arena::signal_out_of_memory(size_t sz, const char* whence) const {
   vm_exit_out_of_memory(sz, OOM_MALLOC_ERROR, whence);
 }
 // Grow a new Chunk
 void* Arena::grow(size_t x, AllocFailType alloc_failmode) {
   // Get minimal required size.  Either real big, or even bigger for giant objs
   size_t len = MAX2(x, (size_t) Chunk::size);
   Chunk *k = _chunk;            // Get filled-up chunk address
   _chunk = new (alloc_failmode, len) Chunk(len);
   if (_chunk == NULL) {
     _chunk = k;                 // restore the previous value of _chunk
     return NULL;
   }
   if (k) k->set_next(_chunk);   // Append new chunk to end of linked list
   else _first = _chunk;
   _hwm  = _chunk->bottom();     // Save the cached hwm, max
   _max =  _chunk->top();
   set_size_in_bytes(size_in_bytes() + len);
   void* result = _hwm;
   _hwm += x;
   return result;
 }
 // Reallocate storage in Arena.
 void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size, AllocFailType alloc_failmode) {
   assert(new_size >= 0, "bad size");
   if (new_size == 0) return NULL;
 #ifdef ASSERT
   if (UseMallocOnly) {
     // always allocate a new object  (otherwise we'll free this one twice)
     char* copy = (char*)Amalloc(new_size, alloc_failmode);
     if (copy == NULL) {
       return NULL;
     }
     size_t n = MIN2(old_size, new_size);
     if (n > 0) memcpy(copy, old_ptr, n);
     Afree(old_ptr,old_size);    // Mostly done to keep stats accurate
     return copy;
   }
 #endif
   char *c_old = (char*)old_ptr; // Handy name
   // Stupid fast special case
   if( new_size <= old_size ) {  // Shrink in-place
     if( c_old+old_size == _hwm) // Attempt to free the excess bytes
       _hwm = c_old+new_size;    // Adjust hwm
     return c_old;
   }
   // make sure that new_size is legal
   size_t corrected_new_size = ARENA_ALIGN(new_size);
   // See if we can resize in-place
   if( (c_old+old_size == _hwm) &&       // Adjusting recent thing
       (c_old+corrected_new_size <= _max) ) {      // Still fits where it sits
     _hwm = c_old+corrected_new_size;      // Adjust hwm
     return c_old;               // Return old pointer
   }
   // Oops, got to relocate guts
   void *new_ptr = Amalloc(new_size, alloc_failmode);
   if (new_ptr == NULL) {
     return NULL;
   }
   memcpy( new_ptr, c_old, old_size );
   Afree(c_old,old_size);        // Mostly done to keep stats accurate
   return new_ptr;
 }
 // Determine if pointer belongs to this Arena or not.
 bool Arena::contains( const void *ptr ) const {
 #ifdef ASSERT
   if (UseMallocOnly) {
     // really slow, but not easy to make fast
     if (_chunk == NULL) return false;
     char** bottom = (char**)_chunk->bottom();
     for (char** p = (char**)_hwm - 1; p >= bottom; p--) {
       if (*p == ptr) return true;
     }
     for (Chunk *c = _first; c != NULL; c = c->next()) {
       if (c == _chunk) continue;  // current chunk has been processed
       char** bottom = (char**)c->bottom();
       for (char** p = (char**)c->top() - 1; p >= bottom; p--) {
         if (*p == ptr) return true;
       }
     }
     return false;
   }
 #endif
   if( (void*)_chunk->bottom() <= ptr && ptr < (void*)_hwm )
     return true;                // Check for in this chunk
   for (Chunk *c = _first; c; c = c->next()) {
     if (c == _chunk) continue;  // current chunk has been processed
     if ((void*)c->bottom() <= ptr && ptr < (void*)c->top()) {
       return true;              // Check for every chunk in Arena
     }
   }
   return false;                 // Not in any Chunk, so not in Arena
 }
 #ifdef ASSERT
 void* Arena::malloc(size_t size) {
   assert(UseMallocOnly, "shouldn't call");
   // use malloc, but save pointer in res. area for later freeing
   char** save = (char**)internal_malloc_4(sizeof(char*));
   return (*save = (char*)os::malloc(size, mtChunk));
 }
 // for debugging with UseMallocOnly
 void* Arena::internal_malloc_4(size_t x) {
   assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
   check_for_overflow(x, "Arena::internal_malloc_4");
   if (_hwm + x > _max) {
     return grow(x);
   } else {
     char *old = _hwm;
     _hwm += x;
     return old;
   }
 }
 #endif
 //--------------------------------------------------------------------------------------
 // Non-product code
 #ifndef PRODUCT
 // The global operator new should never be called since it will usually indicate
 // a memory leak.  Use CHeapObj as the base class of such objects to make it explicit
 // that they're allocated on the C heap.
 // Commented out in product version to avoid conflicts with third-party C++ native code.
 // On certain platforms, such as Mac OS X (Darwin), in debug version, new is being called
 // from jdk source and causing data corruption. Such as
 //  Java_sun_security_ec_ECKeyPairGenerator_generateECKeyPair
 // define ALLOW_OPERATOR_NEW_USAGE for platform on which global operator new allowed.
 //
 #ifndef ALLOW_OPERATOR_NEW_USAGE
 void* operator new(size_t size) throw() {
   assert(false, "Should not call global operator new");
   return 0;
 }
 void* operator new [](size_t size) throw() {
   assert(false, "Should not call global operator new[]");
   return 0;
 }
 void* operator new(size_t size, const std::nothrow_t&  nothrow_constant) throw() {
   assert(false, "Should not call global operator new");
   return 0;
 }
 void* operator new [](size_t size, std::nothrow_t&  nothrow_constant) throw() {
   assert(false, "Should not call global operator new[]");
   return 0;
 }
 void operator delete(void* p) {
   assert(false, "Should not call global delete");
 }
 void operator delete [](void* p) {
   assert(false, "Should not call global delete []");
 }
 #endif // ALLOW_OPERATOR_NEW_USAGE
 void AllocatedObj::print() const       { print_on(tty); }
 void AllocatedObj::print_value() const { print_value_on(tty); }
 void AllocatedObj::print_on(outputStream* st) const {
   st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", p2i(this));
 }
 void AllocatedObj::print_value_on(outputStream* st) const {
   st->print("AllocatedObj(" INTPTR_FORMAT ")", p2i(this));
 }
 julong Arena::_bytes_allocated = 0;
 void Arena::inc_bytes_allocated(size_t x) { inc_stat_counter(&_bytes_allocated, x); }
 AllocStats::AllocStats() {
   start_mallocs      = os::num_mallocs;
   start_frees        = os::num_frees;
   start_malloc_bytes = os::alloc_bytes;
   start_mfree_bytes  = os::free_bytes;
   start_res_bytes    = Arena::_bytes_allocated;
 }
 julong  AllocStats::num_mallocs() { return os::num_mallocs - start_mallocs; }
 julong  AllocStats::alloc_bytes() { return os::alloc_bytes - start_malloc_bytes; }
 julong  AllocStats::num_frees()   { return os::num_frees - start_frees; }
 julong  AllocStats::free_bytes()  { return os::free_bytes - start_mfree_bytes; }
 julong  AllocStats::resource_bytes() { return Arena::_bytes_allocated - start_res_bytes; }
 void    AllocStats::print() {
   tty->print_cr(UINT64_FORMAT " mallocs (" UINT64_FORMAT "MB), "
                 UINT64_FORMAT " frees (" UINT64_FORMAT "MB), " UINT64_FORMAT "MB resrc",
                 num_mallocs(), alloc_bytes()/M, num_frees(), free_bytes()/M, resource_bytes()/M);
 }
 // debugging code
 inline void Arena::free_all(char** start, char** end) {
   for (char** p = start; p < end; p++) if (*p) os::free(*p);
 }
 void Arena::free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) {
   assert(UseMallocOnly, "should not call");
   // free all objects malloced since resource mark was created; resource area
   // contains their addresses
   if (chunk->next()) {
     // this chunk is full, and some others too
     for (Chunk* c = chunk->next(); c != NULL; c = c->next()) {
       char* top = c->top();
       if (c->next() == NULL) {
         top = hwm2;     // last junk is only used up to hwm2
         assert(c->contains(hwm2), "bad hwm2");
       }
       free_all((char**)c->bottom(), (char**)top);
     }
     assert(chunk->contains(hwm), "bad hwm");
     assert(chunk->contains(max), "bad max");
     free_all((char**)hwm, (char**)max);
   } else {
     // this chunk was partially used
     assert(chunk->contains(hwm), "bad hwm");
     assert(chunk->contains(hwm2), "bad hwm2");
     free_all((char**)hwm, (char**)hwm2);
   }
 }
 ReallocMark::ReallocMark() {
 #ifdef ASSERT
   Thread *thread = ThreadLocalStorage::get_thread_slow();
   _nesting = thread->resource_area()->nesting();
 #endif
 }
 void ReallocMark::check() {
 #ifdef ASSERT
   if (_nesting != Thread::current()->resource_area()->nesting()) {
     fatal("allocation bug: array could grow within nested ResourceMark");
   }
 #endif
 }
 #endif // Non-product

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/allocation.cpp@b985cbb00e68 (annotated)

src/share/vm/memory/allocation.cpp