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Java example source code file (icBuffer.hpp)
The icBuffer.hpp Java example source code/* * 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" // // 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 round_to(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 + 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 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 - 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 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 Other Java examples (source code examples)Here is a short list of links related to this Java icBuffer.hpp source code file: |
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