Mercurial > hg > graal-jvmci-8
view src/share/vm/code/icBuffer.hpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author | johnc |
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date | Thu, 22 Sep 2011 10:57:37 -0700 |
parents | f95d63e2154a |
children | da91efe96a93 8c5333c80cfd |
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/* * Copyright (c) 1997, 2010, 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_ICBUFFER_HPP #define SHARE_VM_CODE_ICBUFFER_HPP #include "code/stubs.hpp" #include "interpreter/bytecodes.hpp" #include "memory/allocation.hpp" // // For CompiledIC's: // // In cases where we do not have MT-safe state transformation, // we go to a transition state, using ICStubs. At a safepoint, // the inline caches are transferred from the transitional code: // // instruction_address --> 01 set xxx_oop, Ginline_cache_klass // 23 jump_to Gtemp, yyyy // 4 nop class ICStub: public Stub { private: int _size; // total size of the stub incl. code address _ic_site; // points at call instruction of owning ic-buffer /* stub code follows here */ protected: friend class ICStubInterface; // This will be called only by ICStubInterface void initialize(int size) { _size = size; _ic_site = NULL; } void finalize(); // called when a method is removed // General info int size() const { return _size; } static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; } public: // Creation void set_stub(CompiledIC *ic, oop cached_value, address dest_addr); // Code info address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); } address code_end() const { return (address)this + size(); } // Call site info address ic_site() const { return _ic_site; } void clear(); bool is_empty() const { return _ic_site == NULL; } // stub info address destination() const; // destination of jump instruction oop cached_oop() const; // cached_oop for stub // Debugging void verify() PRODUCT_RETURN; void print() PRODUCT_RETURN; // Creation friend ICStub* ICStub_from_destination_address(address destination_address); }; // ICStub Creation inline ICStub* ICStub_from_destination_address(address destination_address) { ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment)); #ifdef ASSERT stub->verify(); #endif return stub; } class InlineCacheBuffer: public AllStatic { private: // friends friend class ICStub; static int ic_stub_code_size(); static StubQueue* _buffer; static ICStub* _next_stub; static StubQueue* buffer() { return _buffer; } static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; } static ICStub* get_next_stub() { return _next_stub; } static void init_next_stub(); static ICStub* new_ic_stub(); // Machine-dependent implementation of ICBuffer static void assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point); static address ic_buffer_entry_point (address code_begin); static oop ic_buffer_cached_oop (address code_begin); public: // Initialization; must be called before first usage static void initialize(); // Access static bool contains(address instruction_address); // removes the ICStubs after backpatching static void update_inline_caches(); // for debugging static bool is_empty(); // New interface static void create_transition_stub(CompiledIC *ic, oop cached_oop, address entry); static address ic_destination_for(CompiledIC *ic); static oop cached_oop_for(CompiledIC *ic); }; #endif // SHARE_VM_CODE_ICBUFFER_HPP