| /* |
| * Copyright (c) 2014, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_JFR_UTILITIES_JFRALLOCATION_HPP |
| #define SHARE_VM_JFR_UTILITIES_JFRALLOCATION_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "services/memTracker.hpp" |
| #include "utilities/exceptions.hpp" |
| |
| /* |
| * A subclass to the CHeapObj<mtTracing> allocator, useful for critical |
| * Jfr subsystems. Critical in this context means subsystems for which |
| * allocations are crucial to the bootstrap and initialization of Jfr. |
| * The default behaviour by a CHeapObj is to call vm_exit_out_of_memory() |
| * on allocation failure and this is problematic in combination with the |
| * Jfr on-demand, dynamic start at runtime, capability. |
| * We would not like a user dynamically starting Jfr to |
| * tear down the VM she is about to inspect as a side effect. |
| * |
| * This allocator uses the RETURN_NULL capabilities |
| * instead of calling vm_exit_out_of_memory() until Jfr is properly started. |
| * This allows for controlled behaviour on allocation failures during startup, |
| * which means we can take actions on failure, such as transactional rollback |
| * (deallocations and restorations). |
| * In addition, this allocator allows for easy hooking of memory |
| * allocations / deallocations for debugging purposes. |
| */ |
| |
| class JfrCHeapObj : public CHeapObj<mtTracing> { |
| private: |
| static void on_memory_allocation(const void* allocation, size_t size); |
| static char* allocate_array_noinline(size_t elements, size_t element_size); |
| |
| public: |
| NOINLINE void* operator new(size_t size) throw(); |
| NOINLINE void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw(); |
| NOINLINE void* operator new [](size_t size) throw(); |
| NOINLINE void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) throw(); |
| void operator delete(void* p, size_t size); |
| void operator delete [] (void* p, size_t size); |
| static char* realloc_array(char* old, size_t size); |
| static void free(void* p, size_t size = 0); |
| |
| template <class T> |
| static T* new_array(size_t size) { |
| T* const memory = (T*)allocate_array_noinline(size, sizeof(T)); |
| on_memory_allocation(memory, sizeof(T) * size); |
| return memory; |
| } |
| }; |
| |
| #endif // SHARE_VM_JFR_UTILITIES_JFRALLOCATION_HPP |