Mercurial > hg > truffle
view src/share/vm/memory/metachunk.cpp @ 18777:76cbf5f33f82
Truffle-DSL: fixed bug for polymorphic execute optimization.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 05 Jan 2015 02:38:44 +0100 |
parents | 78bbf4d43a14 |
children |
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/* * Copyright (c) 2012, 2014, 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/metachunk.hpp" #include "utilities/copy.hpp" #include "utilities/debug.hpp" PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC class VirtualSpaceNode; const size_t metadata_chunk_initialize = 0xf7f7f7f7; size_t Metachunk::object_alignment() { // Must align pointers and sizes to 8, // so that 64 bit types get correctly aligned. const size_t alignment = 8; // Make sure that the Klass alignment also agree. STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes); return alignment; } size_t Metachunk::overhead() { return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord; } // Metachunk methods Metachunk::Metachunk(size_t word_size, VirtualSpaceNode* container) : Metabase<Metachunk>(word_size), _top(NULL), _container(container) { _top = initial_top(); #ifdef ASSERT set_is_tagged_free(false); size_t data_word_size = pointer_delta(end(), _top, sizeof(MetaWord)); Copy::fill_to_words((HeapWord*)_top, data_word_size, metadata_chunk_initialize); #endif } MetaWord* Metachunk::allocate(size_t word_size) { MetaWord* result = NULL; // If available, bump the pointer to allocate. if (free_word_size() >= word_size) { result = _top; _top = _top + word_size; } return result; } // _bottom points to the start of the chunk including the overhead. size_t Metachunk::used_word_size() const { return pointer_delta(_top, bottom(), sizeof(MetaWord)); } size_t Metachunk::free_word_size() const { return pointer_delta(end(), _top, sizeof(MetaWord)); } void Metachunk::print_on(outputStream* st) const { st->print_cr("Metachunk:" " bottom " PTR_FORMAT " top " PTR_FORMAT " end " PTR_FORMAT " size " SIZE_FORMAT, bottom(), _top, end(), word_size()); if (Verbose) { st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT, used_word_size(), free_word_size()); } } #ifndef PRODUCT void Metachunk::mangle() { // Mangle the payload of the chunk and not the links that // maintain list of chunks. HeapWord* start = (HeapWord*)(bottom() + overhead()); size_t size = word_size() - overhead(); Copy::fill_to_words(start, size, metadata_chunk_initialize); } #endif // PRODUCT void Metachunk::verify() { #ifdef ASSERT // Cannot walk through the blocks unless the blocks have // headers with sizes. assert(bottom() <= _top && _top <= (MetaWord*)end(), "Chunk has been smashed"); #endif return; } /////////////// Unit tests /////////////// #ifndef PRODUCT class TestMetachunk { public: static void test() { size_t size = 2 * 1024 * 1024; void* memory = malloc(size); assert(memory != NULL, "Failed to malloc 2MB"); Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL); assert(metachunk->bottom() == (MetaWord*)metachunk, "assert"); assert(metachunk->end() == (uintptr_t*)metachunk + metachunk->size(), "assert"); // Check sizes assert(metachunk->size() == metachunk->word_size(), "assert"); assert(metachunk->word_size() == pointer_delta(metachunk->end(), metachunk->bottom(), sizeof(MetaWord*)), "assert"); // Check usage assert(metachunk->used_word_size() == metachunk->overhead(), "assert"); assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); assert(metachunk->top() == metachunk->initial_top(), "assert"); assert(metachunk->is_empty(), "assert"); // Allocate size_t alloc_size = 64; // Words assert(is_size_aligned(alloc_size, Metachunk::object_alignment()), "assert"); MetaWord* mem = metachunk->allocate(alloc_size); // Check post alloc assert(mem == metachunk->initial_top(), "assert"); assert(mem + alloc_size == metachunk->top(), "assert"); assert(metachunk->used_word_size() == metachunk->overhead() + alloc_size, "assert"); assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); assert(!metachunk->is_empty(), "assert"); // Clear chunk metachunk->reset_empty(); // Check post clear assert(metachunk->used_word_size() == metachunk->overhead(), "assert"); assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); assert(metachunk->top() == metachunk->initial_top(), "assert"); assert(metachunk->is_empty(), "assert"); free(memory); } }; void TestMetachunk_test() { TestMetachunk::test(); } #endif