Mercurial > hg > truffle
comparison src/cpu/x86/vm/vtableStubs_x86_64.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | f8236e79048a |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2003-2006 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_64.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, | |
35 oop receiver, | |
36 int index); | |
37 #endif | |
38 | |
39 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
40 const int amd64_code_length = VtableStub::pd_code_size_limit(true); | |
41 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index); | |
42 ResourceMark rm; | |
43 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
44 MacroAssembler* masm = new MacroAssembler(&cb); | |
45 | |
46 #ifndef PRODUCT | |
47 if (CountCompiledCalls) { | |
48 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
49 } | |
50 #endif | |
51 | |
52 // get receiver (need to skip return address on top of stack) | |
53 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
54 | |
55 // Free registers (non-args) are rax, rbx | |
56 | |
57 // get receiver klass | |
58 address npe_addr = __ pc(); | |
59 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
60 | |
61 // compute entry offset (in words) | |
62 int entry_offset = | |
63 instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size(); | |
64 | |
65 #ifndef PRODUCT | |
66 if (DebugVtables) { | |
67 Label L; | |
68 // check offset vs vtable length | |
69 __ cmpl(Address(rax, instanceKlass::vtable_length_offset() * wordSize), | |
70 vtable_index * vtableEntry::size()); | |
71 __ jcc(Assembler::greater, L); | |
72 __ movl(rbx, vtable_index); | |
73 __ call_VM(noreg, | |
74 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx); | |
75 __ bind(L); | |
76 } | |
77 #endif // PRODUCT | |
78 | |
79 // load methodOop and target address | |
80 const Register method = rbx; | |
81 | |
82 __ movq(method, Address(rax, | |
83 entry_offset * wordSize + | |
84 vtableEntry::method_offset_in_bytes())); | |
85 if (DebugVtables) { | |
86 Label L; | |
87 __ cmpq(method, (int)NULL); | |
88 __ jcc(Assembler::equal, L); | |
89 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD); | |
90 __ jcc(Assembler::notZero, L); | |
91 __ stop("Vtable entry is NULL"); | |
92 __ bind(L); | |
93 } | |
94 // rax: receiver klass | |
95 // rbx: methodOop | |
96 // rcx: receiver | |
97 address ame_addr = __ pc(); | |
98 __ jmp( Address(rbx, methodOopDesc::from_compiled_offset())); | |
99 | |
100 __ flush(); | |
101 s->set_exception_points(npe_addr, ame_addr); | |
102 return s; | |
103 } | |
104 | |
105 | |
106 VtableStub* VtableStubs::create_itable_stub(int vtable_index) { | |
107 // Note well: pd_code_size_limit is the absolute minimum we can get | |
108 // away with. If you add code here, bump the code stub size | |
109 // returned by pd_code_size_limit! | |
110 const int amd64_code_length = VtableStub::pd_code_size_limit(false); | |
111 VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index); | |
112 ResourceMark rm; | |
113 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
114 MacroAssembler* masm = new MacroAssembler(&cb); | |
115 | |
116 #ifndef PRODUCT | |
117 if (CountCompiledCalls) { | |
118 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
119 } | |
120 #endif | |
121 | |
122 // Entry arguments: | |
123 // rax: Interface | |
124 // j_rarg0: Receiver | |
125 | |
126 // Free registers (non-args) are rax (interface), rbx | |
127 | |
128 // get receiver (need to skip return address on top of stack) | |
129 | |
130 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
131 // get receiver klass (also an implicit null-check) | |
132 address npe_addr = __ pc(); | |
133 | |
134 __ movq(rbx, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
135 | |
136 // If we take a trap while this arg is on the stack we will not | |
137 // be able to walk the stack properly. This is not an issue except | |
138 // when there are mistakes in this assembly code that could generate | |
139 // a spurious fault. Ask me how I know... | |
140 | |
141 __ pushq(j_rarg1); // Most registers are in use, so save one | |
142 | |
143 // compute itable entry offset (in words) | |
144 const int base = instanceKlass::vtable_start_offset() * wordSize; | |
145 assert(vtableEntry::size() * wordSize == 8, | |
146 "adjust the scaling in the code below"); | |
147 // Get length of vtable | |
148 __ movl(j_rarg1, | |
149 Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); | |
150 __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base)); | |
151 | |
152 if (HeapWordsPerLong > 1) { | |
153 // Round up to align_object_offset boundary | |
154 __ round_to_q(rbx, BytesPerLong); | |
155 } | |
156 Label hit, next, entry; | |
157 | |
158 __ jmpb(entry); | |
159 | |
160 __ bind(next); | |
161 __ addq(rbx, itableOffsetEntry::size() * wordSize); | |
162 | |
163 __ bind(entry); | |
164 | |
165 #ifdef ASSERT | |
166 // Check that the entry is non-null | |
167 if (DebugVtables) { | |
168 Label L; | |
169 __ pushq(rbx); | |
170 __ movq(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes())); | |
171 __ testq(rbx, rbx); | |
172 __ jcc(Assembler::notZero, L); | |
173 __ stop("null entry point found in itable's offset table"); | |
174 __ bind(L); | |
175 __ popq(rbx); | |
176 } | |
177 #endif | |
178 | |
179 __ cmpq(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes())); | |
180 __ jcc(Assembler::notEqual, next); | |
181 | |
182 // We found a hit, move offset into j_rarg1 | |
183 __ movl(j_rarg1, Address(rbx, itableOffsetEntry::offset_offset_in_bytes())); | |
184 | |
185 // Compute itableMethodEntry | |
186 const int method_offset = | |
187 (itableMethodEntry::size() * wordSize * vtable_index) + | |
188 itableMethodEntry::method_offset_in_bytes(); | |
189 | |
190 // Get methodOop and entrypoint for compiler | |
191 | |
192 // Get klass pointer again | |
193 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
194 | |
195 const Register method = rbx; | |
196 __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset)); | |
197 | |
198 // Restore saved register, before possible trap. | |
199 __ popq(j_rarg1); | |
200 | |
201 // method (rbx): methodOop | |
202 // j_rarg0: receiver | |
203 | |
204 | |
205 #ifdef ASSERT | |
206 if (DebugVtables) { | |
207 Label L2; | |
208 __ cmpq(method, (int)NULL); | |
209 __ jcc(Assembler::equal, L2); | |
210 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD); | |
211 __ jcc(Assembler::notZero, L2); | |
212 __ stop("compiler entrypoint is null"); | |
213 __ bind(L2); | |
214 } | |
215 #endif // ASSERT | |
216 | |
217 // rbx: methodOop | |
218 // j_rarg0: receiver | |
219 address ame_addr = __ pc(); | |
220 __ jmp(Address(method, methodOopDesc::from_compiled_offset())); | |
221 | |
222 __ flush(); | |
223 s->set_exception_points(npe_addr, ame_addr); | |
224 return s; | |
225 } | |
226 | |
227 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
228 if (is_vtable_stub) { | |
229 // Vtable stub size | |
230 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0); | |
231 } else { | |
232 // Itable stub size | |
233 return (DebugVtables ? 636 : 64) + (CountCompiledCalls ? 13 : 0); | |
234 } | |
235 } | |
236 | |
237 int VtableStub::pd_code_alignment() { | |
238 return wordSize; | |
239 } |