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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_icBuffer_x86.cpp.incl"
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27
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28 int InlineCacheBuffer::ic_stub_code_size() {
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29 return NativeMovConstReg::instruction_size +
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30 NativeJump::instruction_size +
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31 1;
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32 // so that code_end can be set in CodeBuffer
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33 // 64bit 16 = 5 + 10 bytes + 1 byte
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34 // 32bit 11 = 10 bytes + 1 byte
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35 }
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36
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37
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38
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39 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) {
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40 ResourceMark rm;
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41 CodeBuffer code(code_begin, ic_stub_code_size());
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42 MacroAssembler* masm = new MacroAssembler(&code);
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43 // note: even though the code contains an embedded oop, we do not need reloc info
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44 // because
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45 // (1) the oop is old (i.e., doesn't matter for scavenges)
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46 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear
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47 assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop");
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48 masm->lea(rax, OopAddress((address) cached_oop));
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49 masm->jump(ExternalAddress(entry_point));
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50 }
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51
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52
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53 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
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54 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
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55 NativeJump* jump = nativeJump_at(move->next_instruction_address());
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56 return jump->jump_destination();
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57 }
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58
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59
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60 oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {
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61 // creation also verifies the object
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62 NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
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63 // Verifies the jump
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64 NativeJump* jump = nativeJump_at(move->next_instruction_address());
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65 return (oop)move->data();
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66 }
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