Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/cpu/x86/vm/vtableStubs_x86_64.cpp

src/cpu/x86/vm/vtableStubs_x86_64.cpp

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1 /*
2 * Copyright (c) 2003, 2014, 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 "asm/macroAssembler.hpp"
27 #include "code/vtableStubs.hpp"
28 #include "interp_masm_x86.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/instanceKlass.hpp"
31 #include "oops/klassVtable.hpp"
32 #include "runtime/sharedRuntime.hpp"
33 #include "vmreg_x86.inline.hpp"
34 #ifdef COMPILER2
35 #include "opto/runtime.hpp"
36 #endif
37
38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
39
40 // machine-dependent part of VtableStubs: create VtableStub of correct size and
41 // initialize its code
42
43 #define __ masm->
44
45 #ifndef PRODUCT
46 extern "C" void bad_compiled_vtable_index(JavaThread* thread,
47 oop receiver,
48 int index);
49 #endif
50
51 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
52 const int amd64_code_length = VtableStub::pd_code_size_limit(true);
53 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
54 // Can be NULL if there is no free space in the code cache.
55 if (s == NULL) {
56 return NULL;
57 }
58
59 ResourceMark rm;
60 CodeBuffer cb(s->entry_point(), amd64_code_length);
61 MacroAssembler* masm = new MacroAssembler(&cb);
62
63 #ifndef PRODUCT
64 if (CountCompiledCalls) {
65 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
66 }
67 #endif
68
69 // get receiver (need to skip return address on top of stack)
70 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
71
72 // Free registers (non-args) are rax, rbx
73
74 // get receiver klass
75 address npe_addr = __ pc();
76 __ load_klass(rax, j_rarg0);
77
78 #ifndef PRODUCT
79 if (DebugVtables) {
80 Label L;
81 // check offset vs vtable length
82 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize),
83 vtable_index * vtableEntry::size());
84 __ jcc(Assembler::greater, L);
85 __ movl(rbx, vtable_index);
86 __ call_VM(noreg,
87 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
88 __ bind(L);
89 }
90 #endif // PRODUCT
91
92 // load Method* and target address
93 const Register method = rbx;
94
95 __ lookup_virtual_method(rax, vtable_index, method);
96
97 if (DebugVtables) {
98 Label L;
99 __ cmpptr(method, (int32_t)NULL_WORD);
100 __ jcc(Assembler::equal, L);
101 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
102 __ jcc(Assembler::notZero, L);
103 __ stop("Vtable entry is NULL");
104 __ bind(L);
105 }
106 // rax: receiver klass
107 // rbx: Method*
108 // rcx: receiver
109 address ame_addr = __ pc();
110 __ jmp( Address(rbx, Method::from_compiled_offset()));
111
112 __ flush();
113
114 if (PrintMiscellaneous && (WizardMode || Verbose)) {
115 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
116 vtable_index, s->entry_point(),
117 (int)(s->code_end() - s->entry_point()),
118 (int)(s->code_end() - __ pc()));
119 }
120 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
121 // shut the door on sizing bugs
122 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
123 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
124
125 s->set_exception_points(npe_addr, ame_addr);
126 return s;
127 }
128
129
130 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
131 // Note well: pd_code_size_limit is the absolute minimum we can get
132 // away with. If you add code here, bump the code stub size
133 // returned by pd_code_size_limit!
134 const int amd64_code_length = VtableStub::pd_code_size_limit(false);
135 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index);
136 // Can be NULL if there is no free space in the code cache.
137 if (s == NULL) {
138 return NULL;
139 }
140
141 ResourceMark rm;
142 CodeBuffer cb(s->entry_point(), amd64_code_length);
143 MacroAssembler* masm = new MacroAssembler(&cb);
144
145 #ifndef PRODUCT
146 if (CountCompiledCalls) {
147 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
148 }
149 #endif
150
151 // Entry arguments:
152 // rax: Interface
153 // j_rarg0: Receiver
154
155 // Free registers (non-args) are rax (interface), rbx
156
157 // get receiver (need to skip return address on top of stack)
158
159 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
160 // get receiver klass (also an implicit null-check)
161 address npe_addr = __ pc();
162
163 // Most registers are in use; we'll use rax, rbx, r10, r11
164 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them)
165 __ load_klass(r10, j_rarg0);
166
167 // If we take a trap while this arg is on the stack we will not
168 // be able to walk the stack properly. This is not an issue except
169 // when there are mistakes in this assembly code that could generate
170 // a spurious fault. Ask me how I know...
171
172 const Register method = rbx;
173 Label throw_icce;
174
175 // Get Method* and entrypoint for compiler
176 __ lookup_interface_method(// inputs: rec. class, interface, itable index
177 r10, rax, itable_index,
178 // outputs: method, scan temp. reg
179 method, r11,
180 throw_icce);
181
182 // method (rbx): Method*
183 // j_rarg0: receiver
184
185 #ifdef ASSERT
186 if (DebugVtables) {
187 Label L2;
188 __ cmpptr(method, (int32_t)NULL_WORD);
189 __ jcc(Assembler::equal, L2);
190 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
191 __ jcc(Assembler::notZero, L2);
192 __ stop("compiler entrypoint is null");
193 __ bind(L2);
194 }
195 #endif // ASSERT
196
197 // rbx: Method*
198 // j_rarg0: receiver
199 address ame_addr = __ pc();
200 __ jmp(Address(method, Method::from_compiled_offset()));
201
202 __ bind(throw_icce);
203 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
204
205 __ flush();
206
207 if (PrintMiscellaneous && (WizardMode || Verbose)) {
208 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
209 itable_index, s->entry_point(),
210 (int)(s->code_end() - s->entry_point()),
211 (int)(s->code_end() - __ pc()));
212 }
213 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
214 // shut the door on sizing bugs
215 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
216 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
217
218 s->set_exception_points(npe_addr, ame_addr);
219 return s;
220 }
221
222 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
223 if (is_vtable_stub) {
224 // Vtable stub size
225 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
226 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
227 } else {
228 // Itable stub size
229 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
230 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
231 }
232 // In order to tune these parameters, run the JVM with VM options
233 // +PrintMiscellaneous and +WizardMode to see information about
234 // actual itable stubs. Look for lines like this:
235 // itable #1 at 0x5551212[71] left over: 3
236 // Reduce the constants so that the "left over" number is >=3
237 // for the common cases.
238 // Do not aim at a left-over number of zero, because a
239 // large vtable or itable index (>= 32) will require a 32-bit
240 // immediate displacement instead of an 8-bit one.
241 //
242 // The JVM98 app. _202_jess has a megamorphic interface call.
243 // The itable code looks like this:
244 // Decoding VtableStub itbl[1]@12
245 // mov 0x8(%rsi),%r10
246 // mov 0x198(%r10),%r11d
247 // lea 0x218(%r10,%r11,8),%r11
248 // lea 0x8(%r10),%r10
249 // mov (%r11),%rbx
250 // cmp %rbx,%rax
251 // je success
252 // loop:
253 // test %rbx,%rbx
254 // je throw_icce
255 // add $0x10,%r11
256 // mov (%r11),%rbx
257 // cmp %rbx,%rax
258 // jne loop
259 // success:
260 // mov 0x8(%r11),%r11d
261 // mov (%r10,%r11,1),%rbx
262 // jmpq *0x60(%rbx)
263 // throw_icce:
264 // jmpq throw_ICCE_entry
265 }
266
267 int VtableStub::pd_code_alignment() {
268 return wordSize;
269 }

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