Mercurial > hg > truffle

comparison src/cpu/x86/vm/dump_x86_32.cpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children dc7f315e41f7
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2004-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_dump_x86_32.cpp.incl"
27
28
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;
36 // int size = obj->klass()->klass_part()->oop_size(this);
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,
47 // differing only by an ordinal constant, and they bear no releationship
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
54 void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
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 rax, 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 #ifdef WIN32
90 // Expecting to be called with "thiscall" conventions -- the arguments
91 // are on the stack, except that the "this" pointer is in rcx.
92 #else
93 // Expecting to be called with Unix conventions -- the arguments
94 // are on the stack, including the "this" pointer.
95 #endif
96
97 // In addition, rax was set (above) to the offset of the method in the
98 // table.
99
100 #ifdef WIN32
101 __ pushl(rcx); // save "this"
102 #endif
103 __ movl(rcx, rax);
104 __ shrl(rcx, 8); // isolate vtable identifier.
105 __ shll(rcx, LogBytesPerWord);
106 Address index(noreg, rcx, Address::times_1);
107 ExternalAddress vtbl((address)vtbl_list);
108 __ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
109 #ifdef WIN32
110 __ popl(rcx); // restore "this"
111 #else
112 __ movl(rcx, Address(rsp, 4)); // fetch "this"
113 #endif
114 __ movl(Address(rcx, 0), rdx); // update vtable pointer.
115
116 __ andl(rax, 0x00ff); // isolate vtable method index
117 __ shll(rax, LogBytesPerWord);
118 __ addl(rax, rdx); // address of real method pointer.
119 __ jmp(Address(rax, 0)); // get real method pointer.
120
121 __ flush();
122
123 *mc_top = (char*)__ pc();
124 }