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comparison src/cpu/sparc/vm/metaspaceShared_sparc.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/cpu/sparc/vm/dump_sparc.cpp@1d1603768966
children f0c2369fda5a
comparison
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 2004, 2012, 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 "precompiled.hpp"
26 #include "assembler_sparc.inline.hpp"
27 #include "memory/metaspaceShared.hpp"
28
29 // Generate the self-patching vtable method:
30 //
31 // This method will be called (as any other Klass virtual method) with
32 // the Klass itself as the first argument. Example:
33 //
34 // oop obj;
35 // int size = obj->klass()->oop_size(this);
36 //
37 // for which the virtual method call is Klass::oop_size();
38 //
39 // The dummy method is called with the Klass object as the first
40 // operand, and an object as the second argument.
41 //
42
43 //=====================================================================
44
45 // All of the dummy methods in the vtable are essentially identical,
46 // differing only by an ordinal constant, and they bear no relationship
47 // to the original method which the caller intended. Also, there needs
48 // to be 'vtbl_list_size' instances of the vtable in order to
49 // differentiate between the 'vtable_list_size' original Klass objects.
50
51 #define __ masm->
52
53 void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
54 void** vtable,
55 char** md_top,
56 char* md_end,
57 char** mc_top,
58 char* mc_end) {
59
60 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
61 *(intptr_t *)(*md_top) = vtable_bytes;
62 *md_top += sizeof(intptr_t);
63 void** dummy_vtable = (void**)*md_top;
64 *vtable = dummy_vtable;
65 *md_top += vtable_bytes;
66
67 guarantee(*md_top <= md_end, "Insufficient space for vtables.");
68
69 // Get ready to generate dummy methods.
70
71 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
72 MacroAssembler* masm = new MacroAssembler(&cb);
73
74 Label common_code;
75 for (int i = 0; i < vtbl_list_size; ++i) {
76 for (int j = 0; j < num_virtuals; ++j) {
77 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
78 __ save(SP, -256, SP);
79 int offset = (i << 8) + j;
80 Register src = G0;
81 if (!Assembler::is_simm13(offset)) {
82 __ sethi(offset, L0);
83 src = L0;
84 offset = offset & ((1 << 10) - 1);
85 }
86 __ brx(Assembler::always, false, Assembler::pt, common_code);
87
88 // Load L0 with a value indicating vtable/offset pair.
89 // -- bits[ 7..0] (8 bits) which virtual method in table?
90 // -- bits[13..8] (6 bits) which virtual method table?
91 __ delayed()->or3(src, offset, L0);
92 }
93 }
94
95 __ bind(common_code);
96
97 // Expecting to be called with the "this" pointer in O0/I0 (where
98 // "this" is a Klass object). In addition, L0 was set (above) to
99 // identify the method and table.
100
101 // Look up the correct vtable pointer.
102
103 __ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
104 __ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
105 __ sll(L3, LogBytesPerWord, L3);
106 __ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
107 __ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
108
109 // Restore registers and jump to the correct method;
110
111 __ and3(L0, 255, L4); // Isolate L3 = method offset;.
112 __ sll(L4, LogBytesPerWord, L4);
113 __ ld_ptr(L3, L4, L4); // Get address of correct virtual method
114 __ jmpl(L4, 0, G0); // Jump to correct method.
115 __ delayed()->restore(); // Restore registers.
116
117 __ flush();
118 *mc_top = (char*)__ pc();
119
120 guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
121 }