| /* |
| * Copyright (c) 1997, 2013, 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 "asm/codeBuffer.hpp" |
| #include "code/stubs.hpp" |
| #include "interpreter/bytecodes.hpp" |
| #include "memory/allocation.hpp" |
| #include "utilities/align.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, |
| CodeStrings strings) { _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 align_up((int)sizeof(ICStub), CodeEntryAlignment) + code_size; } |
| |
| public: |
| // Creation |
| void set_stub(CompiledIC *ic, void* cached_value, address dest_addr); |
| |
| // Code info |
| address code_begin() const { return (address)this + align_up(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 |
| void* cached_value() const; // cached_value 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 - align_up(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 CompiledICHolder* _pending_released; |
| static int _pending_count; |
| |
| 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, void* cached_value, address entry_point); |
| static address ic_buffer_entry_point (address code_begin); |
| static void* ic_buffer_cached_value (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(); |
| |
| static void release_pending_icholders(); |
| static void queue_for_release(CompiledICHolder* icholder); |
| static int pending_icholder_count() { return _pending_count; } |
| |
| // New interface |
| static void create_transition_stub(CompiledIC *ic, void* cached_value, address entry); |
| static address ic_destination_for(CompiledIC *ic); |
| static void* cached_value_for(CompiledIC *ic); |
| }; |
| |
| #endif // SHARE_VM_CODE_ICBUFFER_HPP |