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/*
* Copyright (c) 1997, 2012, 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, 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
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