--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/arena.hpp Wed Aug 16 11:17:54 2017 -0400
@@ -0,0 +1,253 @@
+/*
+ * Copyright (c) 2017, 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_ARENA_HPP
+#define SHARE_VM_ARENA_HPP
+
+#include "memory/allocation.hpp"
+#include "runtime/globals.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+#include <new>
+
+// The byte alignment to be used by Arena::Amalloc. See bugid 4169348.
+// Note: this value must be a power of 2
+
+#define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
+
+#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)
+
+//------------------------------Chunk------------------------------------------
+// Linked list of raw memory chunks
+class Chunk: CHeapObj<mtChunk> {
+
+ private:
+ 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
+#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)
+
+#endif // SHARE_VM_ARENA_HPP