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comparison src/cpu/x86/vm/vtableStubs_x86_32.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2006 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/_vtableStubs_x86_32.cpp.incl"
27
28 // machine-dependent part of VtableStubs: create VtableStub of correct size and
29 // initialize its code
30
31 #define __ masm->
32
33 #ifndef PRODUCT
34 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
35 #endif
36
37 // used by compiler only; may use only caller saved registers rax, rbx, rcx.
38 // rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
39 // Leave receiver in rcx; required behavior when +OptoArgsInRegisters
40 // is modifed to put first oop in rcx.
41 //
42 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
43 const int i486_code_length = VtableStub::pd_code_size_limit(true);
44 VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
45 ResourceMark rm;
46 CodeBuffer cb(s->entry_point(), i486_code_length);
47 MacroAssembler* masm = new MacroAssembler(&cb);
48
49 #ifndef PRODUCT
50
51 if (CountCompiledCalls) {
52 __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
53 }
54 #endif /* PRODUCT */
55
56 // get receiver (need to skip return address on top of stack)
57 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
58
59 // get receiver klass
60 address npe_addr = __ pc();
61 __ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
62 // compute entry offset (in words)
63 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
64 #ifndef PRODUCT
65 if (DebugVtables) {
66 Label L;
67 // check offset vs vtable length
68 __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
69 __ jcc(Assembler::greater, L);
70 __ movl(rbx, vtable_index);
71 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
72 __ bind(L);
73 }
74 #endif // PRODUCT
75
76 const Register method = rbx;
77
78 // load methodOop and target address
79 __ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
80 if (DebugVtables) {
81 Label L;
82 __ cmpl(method, NULL_WORD);
83 __ jcc(Assembler::equal, L);
84 __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
85 __ jcc(Assembler::notZero, L);
86 __ stop("Vtable entry is NULL");
87 __ bind(L);
88 }
89
90 // rax,: receiver klass
91 // method (rbx): methodOop
92 // rcx: receiver
93 address ame_addr = __ pc();
94 __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
95
96 masm->flush();
97 s->set_exception_points(npe_addr, ame_addr);
98 return s;
99 }
100
101
102 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
103 // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you
104 // add code here, bump the code stub size returned by pd_code_size_limit!
105 const int i486_code_length = VtableStub::pd_code_size_limit(false);
106 VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
107 ResourceMark rm;
108 CodeBuffer cb(s->entry_point(), i486_code_length);
109 MacroAssembler* masm = new MacroAssembler(&cb);
110
111 // Entry arguments:
112 // rax,: Interface
113 // rcx: Receiver
114
115 #ifndef PRODUCT
116 if (CountCompiledCalls) {
117 __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
118 }
119 #endif /* PRODUCT */
120 // get receiver (need to skip return address on top of stack)
121
122 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
123
124 // get receiver klass (also an implicit null-check)
125 address npe_addr = __ pc();
126 __ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
127
128 __ movl(rsi, rbx); // Save klass in free register
129 // Most registers are in use, so save a few
130 __ pushl(rdx);
131 // compute itable entry offset (in words)
132 const int base = instanceKlass::vtable_start_offset() * wordSize;
133 assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
134 __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
135 __ leal(rbx, Address(rbx, rdx, Address::times_4, base));
136 if (HeapWordsPerLong > 1) {
137 // Round up to align_object_offset boundary
138 __ round_to(rbx, BytesPerLong);
139 }
140
141 Label hit, next, entry;
142
143 __ jmp(entry);
144
145 __ bind(next);
146 __ addl(rbx, itableOffsetEntry::size() * wordSize);
147
148 __ bind(entry);
149
150 #ifdef ASSERT
151 // Check that the entry is non-null
152 if (DebugVtables) {
153 Label L;
154 __ pushl(rbx);
155 __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
156 __ testl(rbx, rbx);
157 __ jcc(Assembler::notZero, L);
158 __ stop("null entry point found in itable's offset table");
159 __ bind(L);
160 __ popl(rbx);
161 }
162 #endif
163 __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
164 __ jcc(Assembler::notEqual, next);
165
166 // We found a hit, move offset into rbx,
167 __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
168
169 // Compute itableMethodEntry.
170 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
171
172 // Get methodOop and entrypoint for compiler
173 const Register method = rbx;
174 __ movl(method, Address(rsi, rdx, Address::times_1, method_offset));
175
176 // Restore saved register, before possible trap.
177 __ popl(rdx);
178
179 // method (rbx): methodOop
180 // rcx: receiver
181
182 #ifdef ASSERT
183 if (DebugVtables) {
184 Label L1;
185 __ cmpl(method, NULL_WORD);
186 __ jcc(Assembler::equal, L1);
187 __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
188 __ jcc(Assembler::notZero, L1);
189 __ stop("methodOop is null");
190 __ bind(L1);
191 }
192 #endif // ASSERT
193
194 address ame_addr = __ pc();
195 __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
196
197 masm->flush();
198 s->set_exception_points(npe_addr, ame_addr);
199 return s;
200 }
201
202
203
204 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
205 if (is_vtable_stub) {
206 // Vtable stub size
207 return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
208 } else {
209 // Itable stub size
210 return (DebugVtables ? 140 : 55) + (CountCompiledCalls ? 6 : 0);
211 }
212 }
213
214 int VtableStub::pd_code_alignment() {
215 return wordSize;
216 }