129 lines
4.4 KiB
C++
129 lines
4.4 KiB
C++
/*
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* Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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//
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// For CompiledIC's:
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//
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// In cases where we do not have MT-safe state transformation,
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// we go to a transition state, using ICStubs. At a safepoint,
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// the inline caches are transferred from the transitional code:
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//
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// instruction_address --> 01 set xxx_oop, Ginline_cache_klass
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// 23 jump_to Gtemp, yyyy
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// 4 nop
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class ICStub: public Stub {
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private:
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int _size; // total size of the stub incl. code
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address _ic_site; // points at call instruction of owning ic-buffer
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/* stub code follows here */
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protected:
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friend class ICStubInterface;
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// This will be called only by ICStubInterface
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void initialize(int size) { _size = size; _ic_site = NULL; }
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void finalize(); // called when a method is removed
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// General info
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int size() const { return _size; }
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static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
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public:
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// Creation
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void set_stub(CompiledIC *ic, oop cached_value, address dest_addr);
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// Code info
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address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
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address code_end() const { return (address)this + size(); }
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// Call site info
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address ic_site() const { return _ic_site; }
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void clear();
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bool is_empty() const { return _ic_site == NULL; }
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// stub info
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address destination() const; // destination of jump instruction
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oop cached_oop() const; // cached_oop for stub
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// Debugging
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void verify() PRODUCT_RETURN;
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void print() PRODUCT_RETURN;
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// Creation
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friend ICStub* ICStub_from_destination_address(address destination_address);
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};
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// ICStub Creation
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inline ICStub* ICStub_from_destination_address(address destination_address) {
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ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
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#ifdef ASSERT
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stub->verify();
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#endif
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return stub;
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}
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class InlineCacheBuffer: public AllStatic {
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private:
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// friends
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friend class ICStub;
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static int ic_stub_code_size();
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static StubQueue* _buffer;
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static ICStub* _next_stub;
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static StubQueue* buffer() { return _buffer; }
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static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
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static ICStub* get_next_stub() { return _next_stub; }
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static void init_next_stub();
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static ICStub* new_ic_stub();
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// Machine-dependent implementation of ICBuffer
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static void assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);
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static address ic_buffer_entry_point (address code_begin);
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static oop ic_buffer_cached_oop (address code_begin);
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public:
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// Initialization; must be called before first usage
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static void initialize();
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// Access
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static bool contains(address instruction_address);
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// removes the ICStubs after backpatching
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static void update_inline_caches();
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// for debugging
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static bool is_empty();
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// New interface
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static void create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);
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static address ic_destination_for(CompiledIC *ic);
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static oop cached_oop_for(CompiledIC *ic);
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};
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