Mercurial > hg > truffle
annotate src/cpu/x86/vm/metaspaceShared_x86_64.cpp @ 20304:a22acf6d7598
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 | cd3d6a6b95d9 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
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26 #include "asm/macroAssembler.hpp" |
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27 #include "asm/codeBuffer.hpp" |
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coleenp
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28 #include "memory/metaspaceShared.hpp" |
| 0 | 29 |
| 30 // Generate the self-patching vtable method: | |
| 31 // | |
| 32 // This method will be called (as any other Klass virtual method) with | |
| 33 // the Klass itself as the first argument. Example: | |
| 34 // | |
| 35 // oop obj; | |
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36 // int size = obj->klass()->oop_size(this); |
| 0 | 37 // |
| 38 // for which the virtual method call is Klass::oop_size(); | |
| 39 // | |
| 40 // The dummy method is called with the Klass object as the first | |
| 41 // operand, and an object as the second argument. | |
| 42 // | |
| 43 | |
| 44 //===================================================================== | |
| 45 | |
| 46 // All of the dummy methods in the vtable are essentially identical, | |
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47 // differing only by an ordinal constant, and they bear no relationship |
| 0 | 48 // to the original method which the caller intended. Also, there needs |
| 49 // to be 'vtbl_list_size' instances of the vtable in order to | |
| 50 // differentiate between the 'vtable_list_size' original Klass objects. | |
| 51 | |
| 52 #define __ masm-> | |
| 53 | |
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54 void MetaspaceShared::generate_vtable_methods(void** vtbl_list, |
| 0 | 55 void** vtable, |
| 56 char** md_top, | |
| 57 char* md_end, | |
| 58 char** mc_top, | |
| 59 char* mc_end) { | |
| 60 | |
| 61 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*); | |
| 62 *(intptr_t *)(*md_top) = vtable_bytes; | |
| 63 *md_top += sizeof(intptr_t); | |
| 64 void** dummy_vtable = (void**)*md_top; | |
| 65 *vtable = dummy_vtable; | |
| 66 *md_top += vtable_bytes; | |
| 67 | |
| 68 // Get ready to generate dummy methods. | |
| 69 | |
| 70 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top); | |
| 71 MacroAssembler* masm = new MacroAssembler(&cb); | |
| 72 | |
| 73 Label common_code; | |
| 74 for (int i = 0; i < vtbl_list_size; ++i) { | |
| 75 for (int j = 0; j < num_virtuals; ++j) { | |
| 76 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc(); | |
| 77 | |
| 78 // Load eax with a value indicating vtable/offset pair. | |
| 79 // -- bits[ 7..0] (8 bits) which virtual method in table? | |
| 80 // -- bits[12..8] (5 bits) which virtual method table? | |
| 81 // -- must fit in 13-bit instruction immediate field. | |
| 82 __ movl(rax, (i << 8) + j); | |
| 83 __ jmp(common_code); | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 __ bind(common_code); | |
| 88 | |
| 89 // Expecting to be called with "thiscall" convections -- the arguments | |
| 90 // are on the stack and the "this" pointer is in c_rarg0. In addition, rax | |
| 91 // was set (above) to the offset of the method in the table. | |
| 92 | |
| 304 | 93 __ push(c_rarg1); // save & free register |
| 94 __ push(c_rarg0); // save "this" | |
| 95 __ mov(c_rarg0, rax); | |
| 96 __ shrptr(c_rarg0, 8); // isolate vtable identifier. | |
| 97 __ shlptr(c_rarg0, LogBytesPerWord); | |
| 0 | 98 __ lea(c_rarg1, ExternalAddress((address)vtbl_list)); // ptr to correct vtable list. |
| 304 | 99 __ addptr(c_rarg1, c_rarg0); // ptr to list entry. |
| 100 __ movptr(c_rarg1, Address(c_rarg1, 0)); // get correct vtable address. | |
| 101 __ pop(c_rarg0); // restore "this" | |
| 102 __ movptr(Address(c_rarg0, 0), c_rarg1); // update vtable pointer. | |
| 0 | 103 |
| 304 | 104 __ andptr(rax, 0x00ff); // isolate vtable method index |
| 105 __ shlptr(rax, LogBytesPerWord); | |
| 106 __ addptr(rax, c_rarg1); // address of real method pointer. | |
| 107 __ pop(c_rarg1); // restore register. | |
| 108 __ movptr(rax, Address(rax, 0)); // get real method pointer. | |
| 0 | 109 __ jmp(rax); // jump to the real method. |
| 110 | |
| 111 __ flush(); | |
| 112 | |
| 113 *mc_top = (char*)__ pc(); | |
| 114 } |