icBuffer_x86.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_icBuffer_x86.cpp.incl" 27 28int InlineCacheBuffer::ic_stub_code_size() { 29 return NativeMovConstReg::instruction_size + 30 NativeJump::instruction_size + 31 1; 32 // so that code_end can be set in CodeBuffer 33 // 64bit 16 = 5 + 10 bytes + 1 byte 34 // 32bit 11 = 10 bytes + 1 byte 35} 36 37 38 39void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) { 40 ResourceMark rm; 41 CodeBuffer code(code_begin, ic_stub_code_size()); 42 MacroAssembler* masm = new MacroAssembler(&code); 43 // note: even though the code contains an embedded oop, we do not need reloc info 44 // because 45 // (1) the oop is old (i.e., doesn't matter for scavenges) 46 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear 47 assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop"); 48 masm->lea(rax, OopAddress((address) cached_oop)); 49 masm->jump(ExternalAddress(entry_point)); 50} 51 52 53address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) { 54 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object 55 NativeJump* jump = nativeJump_at(move->next_instruction_address()); 56 return jump->jump_destination(); 57} 58 59 60oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) { 61 // creation also verifies the object 62 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); 63 // Verifies the jump 64 NativeJump* jump = nativeJump_at(move->next_instruction_address()); 65 return (oop)move->data(); 66} 67