jdk8-mips64-public/hotspot: comparison src/share/vm/code/oopRecorder.hpp

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+/*
+* Copyright (c) 1998, 2012, 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_CODE_OOPRECORDER_HPP
+#define SHARE_VM_CODE_OOPRECORDER_HPP
+#include "memory/universe.hpp"
+#include "runtime/handles.hpp"
+#include "utilities/growableArray.hpp"
+// Recording and retrieval of either oop relocations or metadata in compiled code.
+class CodeBlob;
+template <class T> class ValueRecorder : public StackObj {
+public:
+// A two-way mapping from positive indexes to oop handles.
+// The zero index is reserved for a constant (sharable) null.
+// Indexes may not be negative.
+// Use the given arena to manage storage, if not NULL.
+// By default, uses the current ResourceArea.
+ValueRecorder(Arena* arena = NULL);
+// Generate a new index on which nmethod::oop_addr_at will work.
+// allocate_index and find_index never return the same index,
+// and allocate_index never returns the same index twice.
+// In fact, two successive calls to allocate_index return successive ints.
+int allocate_index(T h) {
+return add_handle(h, false);
+}
+// For a given jobject or Metadata*, this will return the same index
+// repeatedly. The index can later be given to nmethod::oop_at or
+// metadata_at to retrieve the oop.
+// However, the oop must not be changed via nmethod::oop_addr_at.
+int find_index(T h) {
+int index = maybe_find_index(h);
+if (index < 0) {  // previously unallocated
+index = add_handle(h, true);
+}
+return index;
+}
+// returns the size of the generated oop/metadata table, for sizing the
+// CodeBlob. Must be called after all oops are allocated!
+int size();
+// Retrieve the value at a given index.
+T at(int index);
+int count() {
+if (_handles == NULL) return 0;
+// there is always a NULL virtually present as first object
+return _handles->length() + first_index;
+}
+// Helper function; returns false for NULL or Universe::non_oop_word().
+bool is_real(T h) {
+return h != NULL && h != (T)Universe::non_oop_word();
+}
+// copy the generated table to nmethod
+void copy_values_to(nmethod* nm);
+bool is_unused() { return _handles == NULL && !_complete; }
+#ifdef ASSERT
+bool is_complete() { return _complete; }
+#endif
+private:
+// variant of find_index which does not allocate if not found (yields -1)
+int maybe_find_index(T h);
+// leaky hash table of handle => index, to help detect duplicate insertion
+template <class X> class IndexCache : public ResourceObj {
+// This class is only used by the ValueRecorder class.
+friend class ValueRecorder;
+enum {
+_log_cache_size = 9,
+_cache_size = (1<<_log_cache_size),
+// Index entries are ints.  The LSBit is a collision indicator.
+_collision_bit_shift = 0,
+_collision_bit = 1,
+_index_shift = _collision_bit_shift+1
+};
+int _cache[_cache_size];
+static juint cache_index(X handle) {
+juint ci = (int) (intptr_t) handle;
+ci ^= ci >> (BitsPerByte*2);
+ci += ci >> (BitsPerByte*1);
+return ci & (_cache_size-1);
+}
+int* cache_location(X handle) {
+return &_cache[ cache_index(handle) ];
+}
+static bool cache_location_collision(int* cloc) {
+return ((*cloc) & _collision_bit) != 0;
+}
+static int cache_location_index(int* cloc) {
+return (*cloc) >> _index_shift;
+}
+static void set_cache_location_index(int* cloc, int index) {
+int cval0 = (*cloc);
+int cval1 = (index << _index_shift);
+if (cval0 != 0 && cval1 != cval0)  cval1 += _collision_bit;
+(*cloc) = cval1;
+}
+IndexCache();
+};
+void maybe_initialize();
+int add_handle(T h, bool make_findable);
+enum { null_index = 0, first_index = 1, index_cache_threshold = 20 };
+GrowableArray<T>*        _handles;  // ordered list (first is always NULL)
+GrowableArray<int>*       _no_finds; // all unfindable indexes; usually empty
+IndexCache<T>*           _indexes;  // map: handle -> its probable index
+Arena*                    _arena;
+bool                      _complete;
+#ifdef ASSERT
+static int _find_index_calls, _hit_indexes, _missed_indexes;
+#endif
+};
+class OopRecorder : public ResourceObj {
+private:
+ValueRecorder<jobject>      _oops;
+ValueRecorder<Metadata*>    _metadata;
+public:
+OopRecorder(Arena* arena = NULL): _oops(arena), _metadata(arena) {}
+int allocate_oop_index(jobject h) {
+return _oops.allocate_index(h);
+}
+int find_index(jobject h) {
+return _oops.find_index(h);
+}
+jobject oop_at(int index) {
+return _oops.at(index);
+}
+int oop_size() {
+return _oops.size();
+}
+int oop_count() {
+return _oops.count();
+}
+bool is_real(jobject h) {
+return _oops.is_real(h);
+}
+int allocate_metadata_index(Metadata* oop) {
+return _metadata.allocate_index(oop);
+}
+int find_index(Metadata* h) {
+return _metadata.find_index(h);
+}
+Metadata* metadata_at(int index) {
+return _metadata.at(index);
+}
+int metadata_size() {
+return _metadata.size();
+}
+int metadata_count() {
+return _metadata.count();
+}
+bool is_real(Metadata* h) {
+return _metadata.is_real(h);
+}
+bool is_unused() {
+return _oops.is_unused() && _metadata.is_unused();
+}
+void freeze() {
+_oops.size();
+_metadata.size();
+}
+void copy_values_to(nmethod* nm) {
+if (!_oops.is_unused()) {
+_oops.copy_values_to(nm);
+}
+if (!_metadata.is_unused()) {
+_metadata.copy_values_to(nm);
+}
+}
+#ifdef ASSERT
+bool is_complete() {
+assert(_oops.is_complete() == _metadata.is_complete(), "must agree");
+return _oops.is_complete();
+}
+#endif
+};
+#endif // SHARE_VM_CODE_OOPRECORDER_HPP

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/code/oopRecorder.hpp

src/share/vm/code/oopRecorder.hpp