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annotate src/cpu/ppc/vm/icBuffer_ppc.cpp @ 20304:a22acf6d7598

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8048112: G1 Full GC needs to support the case when the very first region is not available Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett. Reviewed-by: brutisso
author tschatzl
date Mon, 21 Jul 2014 10:00:31 +0200
parents ec28f9c041ff
children
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1 /*
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2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #include "precompiled.hpp"
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27 #include "asm/assembler.hpp"
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28 #include "assembler_ppc.inline.hpp"
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29 #include "code/icBuffer.hpp"
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30 #include "gc_interface/collectedHeap.inline.hpp"
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31 #include "interpreter/bytecodes.hpp"
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32 #include "memory/resourceArea.hpp"
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33 #include "nativeInst_ppc.hpp"
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34 #include "oops/oop.inline.hpp"
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35 #include "oops/oop.inline2.hpp"
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36
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37 #define __ masm.
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38
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39 int InlineCacheBuffer::ic_stub_code_size() {
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40 return MacroAssembler::load_const_size + MacroAssembler::b64_patchable_size;
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41 }
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42
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43 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
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44 ResourceMark rm;
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45 CodeBuffer code(code_begin, ic_stub_code_size());
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46 MacroAssembler masm(&code);
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47 // Note: even though the code contains an embedded metadata, we do not need reloc info
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48 // because
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49 // (1) the metadata is old (i.e., doesn't matter for scavenges)
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50 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.
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51
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52 // Load the oop ...
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53 __ load_const(R19_method, (address) cached_value, R0);
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54 // ... and jump to entry point.
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55 __ b64_patchable((address) entry_point, relocInfo::none);
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56
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57 __ flush();
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58 }
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59
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60 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
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61 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
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62 NativeJump* jump = nativeJump_at(move->next_instruction_address());
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63 return jump->jump_destination();
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64 }
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65
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66 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
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67 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
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68 void* o = (void*)move->data();
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69 return o;
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70 }
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71