1 /*
2 * Copyright (c) 2004, 2010, 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 "memory/resourceArea.hpp"
28 #include "prims/jniFastGetField.hpp"
29 #include "prims/jvm_misc.hpp"
30 #include "runtime/safepoint.hpp"
31
32 #define __ masm->
33
34 #define BUFFER_SIZE 30
35
36 #ifdef _WINDOWS
37 GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
38 GetByteField_t JNI_FastGetField::jni_fast_GetByteField_fp;
39 GetCharField_t JNI_FastGetField::jni_fast_GetCharField_fp;
40 GetShortField_t JNI_FastGetField::jni_fast_GetShortField_fp;
41 GetIntField_t JNI_FastGetField::jni_fast_GetIntField_fp;
42 GetLongField_t JNI_FastGetField::jni_fast_GetLongField_fp;
43 GetFloatField_t JNI_FastGetField::jni_fast_GetFloatField_fp;
44 GetDoubleField_t JNI_FastGetField::jni_fast_GetDoubleField_fp;
45 #endif
46
47 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
48 // between loads, which is much more efficient than lfence.
49
50 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
51 const char *name;
52 switch (type) {
53 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
54 case T_BYTE: name = "jni_fast_GetByteField"; break;
55 case T_CHAR: name = "jni_fast_GetCharField"; break;
56 case T_SHORT: name = "jni_fast_GetShortField"; break;
57 case T_INT: name = "jni_fast_GetIntField"; break;
58 default: ShouldNotReachHere();
59 }
60 ResourceMark rm;
61 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
62 CodeBuffer cbuf(blob);
63 MacroAssembler* masm = new MacroAssembler(&cbuf);
64 address fast_entry = __ pc();
65
66 Label slow;
67
68 // stack layout: offset from rsp (in words):
69 // return pc 0
70 // jni env 1
71 // obj 2
72 // jfieldID 3
73
74 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
75 __ mov32 (rcx, counter);
76 __ testb (rcx, 1);
77 __ jcc (Assembler::notZero, slow);
78 if (os::is_MP()) {
79 __ mov(rax, rcx);
80 __ andptr(rax, 1); // rax, must end up 0
81 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
82 // obj, notice rax, is 0.
83 // rdx is data dependent on rcx.
84 } else {
85 __ movptr (rdx, Address(rsp, 2*wordSize)); // obj
86 }
87 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
88 __ movptr(rdx, Address(rdx, 0)); // *obj
89 __ shrptr (rax, 2); // offset
90
91 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
92 speculative_load_pclist[count] = __ pc();
93 switch (type) {
94 case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
95 case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
96 case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
97 case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
98 case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
99 default: ShouldNotReachHere();
100 }
101
102 Address ca1;
103 if (os::is_MP()) {
104 __ lea(rdx, counter);
105 __ xorptr(rdx, rax);
106 __ xorptr(rdx, rax);
107 __ cmp32(rcx, Address(rdx, 0));
108 // ca1 is the same as ca because
109 // rax, ^ counter_addr ^ rax, = address
110 // ca1 is data dependent on rax,.
111 } else {
112 __ cmp32(rcx, counter);
113 }
114 __ jcc (Assembler::notEqual, slow);
115
116 #ifndef _WINDOWS
117 __ ret (0);
118 #else
119 // __stdcall calling convention
120 __ ret (3*wordSize);
121 #endif
122
123 slowcase_entry_pclist[count++] = __ pc();
124 __ bind (slow);
125 address slow_case_addr;
126 switch (type) {
127 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
128 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
129 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
130 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
131 case T_INT: slow_case_addr = jni_GetIntField_addr();
132 }
133 // tail call
134 __ jump (ExternalAddress(slow_case_addr));
135
136 __ flush ();
137
138 #ifndef _WINDOWS
139 return fast_entry;
140 #else
141 switch (type) {
142 case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
143 case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t) fast_entry; break;
144 case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t) fast_entry; break;
145 case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t) fast_entry; break;
146 case T_INT: jni_fast_GetIntField_fp = (GetIntField_t) fast_entry; break;
147 }
148 return os::win32::fast_jni_accessor_wrapper(type);
149 #endif
150 }
151
152 address JNI_FastGetField::generate_fast_get_boolean_field() {
153 return generate_fast_get_int_field0(T_BOOLEAN);
154 }
155
156 address JNI_FastGetField::generate_fast_get_byte_field() {
157 return generate_fast_get_int_field0(T_BYTE);
158 }
159
160 address JNI_FastGetField::generate_fast_get_char_field() {
161 return generate_fast_get_int_field0(T_CHAR);
162 }
163
164 address JNI_FastGetField::generate_fast_get_short_field() {
165 return generate_fast_get_int_field0(T_SHORT);
166 }
167
168 address JNI_FastGetField::generate_fast_get_int_field() {
169 return generate_fast_get_int_field0(T_INT);
170 }
171
172 address JNI_FastGetField::generate_fast_get_long_field() {
173 const char *name = "jni_fast_GetLongField";
174 ResourceMark rm;
175 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
176 CodeBuffer cbuf(blob);
177 MacroAssembler* masm = new MacroAssembler(&cbuf);
178 address fast_entry = __ pc();
179
180 Label slow;
181
182 // stack layout: offset from rsp (in words):
183 // old rsi 0
184 // return pc 1
185 // jni env 2
186 // obj 3
187 // jfieldID 4
188
189 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
190
191 __ push (rsi);
192 __ mov32 (rcx, counter);
193 __ testb (rcx, 1);
194 __ jcc (Assembler::notZero, slow);
195 if (os::is_MP()) {
196 __ mov(rax, rcx);
197 __ andptr(rax, 1); // rax, must end up 0
198 __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
199 // obj, notice rax, is 0.
200 // rdx is data dependent on rcx.
201 } else {
202 __ movptr(rdx, Address(rsp, 3*wordSize)); // obj
203 }
204 __ movptr(rsi, Address(rsp, 4*wordSize)); // jfieldID
205 __ movptr(rdx, Address(rdx, 0)); // *obj
206 __ shrptr(rsi, 2); // offset
207
208 assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
209 speculative_load_pclist[count++] = __ pc();
210 __ movptr(rax, Address(rdx, rsi, Address::times_1));
211 #ifndef _LP64
212 speculative_load_pclist[count] = __ pc();
213 __ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
214 #endif // _LP64
215
216 if (os::is_MP()) {
217 __ lea(rsi, counter);
218 __ xorptr(rsi, rdx);
219 __ xorptr(rsi, rax);
220 __ xorptr(rsi, rdx);
221 __ xorptr(rsi, rax);
222 __ cmp32(rcx, Address(rsi, 0));
223 // ca1 is the same as ca because
224 // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
225 // ca1 is data dependent on both rax, and rdx.
226 } else {
227 __ cmp32(rcx, counter);
228 }
229 __ jcc (Assembler::notEqual, slow);
230
231 __ pop (rsi);
232
233 #ifndef _WINDOWS
234 __ ret (0);
235 #else
236 // __stdcall calling convention
237 __ ret (3*wordSize);
238 #endif
239
240 slowcase_entry_pclist[count-1] = __ pc();
241 slowcase_entry_pclist[count++] = __ pc();
242 __ bind (slow);
243 __ pop (rsi);
244 address slow_case_addr = jni_GetLongField_addr();;
245 // tail call
246 __ jump (ExternalAddress(slow_case_addr));
247
248 __ flush ();
249
250 #ifndef _WINDOWS
251 return fast_entry;
252 #else
253 jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;
254 return os::win32::fast_jni_accessor_wrapper(T_LONG);
255 #endif
256 }
257
258 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
259 const char *name;
260 switch (type) {
261 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
262 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
263 default: ShouldNotReachHere();
264 }
265 ResourceMark rm;
266 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
267 CodeBuffer cbuf(blob);
268 MacroAssembler* masm = new MacroAssembler(&cbuf);
269 address fast_entry = __ pc();
270
271 Label slow_with_pop, slow;
272
273 // stack layout: offset from rsp (in words):
274 // return pc 0
275 // jni env 1
276 // obj 2
277 // jfieldID 3
278
279 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
280
281 __ mov32 (rcx, counter);
282 __ testb (rcx, 1);
283 __ jcc (Assembler::notZero, slow);
284 if (os::is_MP()) {
285 __ mov(rax, rcx);
286 __ andptr(rax, 1); // rax, must end up 0
287 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
288 // obj, notice rax, is 0.
289 // rdx is data dependent on rcx.
290 } else {
291 __ movptr(rdx, Address(rsp, 2*wordSize)); // obj
292 }
293 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
294 __ movptr(rdx, Address(rdx, 0)); // *obj
295 __ shrptr(rax, 2); // offset
296
297 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
298 speculative_load_pclist[count] = __ pc();
299 switch (type) {
300 #ifndef _LP64
301 case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
302 case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
303 #else
304 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
305 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
306 #endif // _LP64
307 default: ShouldNotReachHere();
308 }
309
310 Address ca1;
311 if (os::is_MP()) {
312 __ fst_s (Address(rsp, -4));
313 __ lea(rdx, counter);
314 __ movl (rax, Address(rsp, -4));
315 // garbage hi-order bits on 64bit are harmless.
316 __ xorptr(rdx, rax);
317 __ xorptr(rdx, rax);
318 __ cmp32(rcx, Address(rdx, 0));
319 // rax, ^ counter_addr ^ rax, = address
320 // ca1 is data dependent on the field
321 // access.
322 } else {
323 __ cmp32(rcx, counter);
324 }
325 __ jcc (Assembler::notEqual, slow_with_pop);
326
327 #ifndef _WINDOWS
328 __ ret (0);
329 #else
330 // __stdcall calling convention
331 __ ret (3*wordSize);
332 #endif
333
334 __ bind (slow_with_pop);
335 // invalid load. pop FPU stack.
336 __ fstp_d (0);
337
338 slowcase_entry_pclist[count++] = __ pc();
339 __ bind (slow);
340 address slow_case_addr;
341 switch (type) {
342 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
343 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
344 default: ShouldNotReachHere();
345 }
346 // tail call
347 __ jump (ExternalAddress(slow_case_addr));
348
349 __ flush ();
350
351 #ifndef _WINDOWS
352 return fast_entry;
353 #else
354 switch (type) {
355 case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t) fast_entry; break;
356 case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
357 }
358 return os::win32::fast_jni_accessor_wrapper(type);
359 #endif
360 }
361
362 address JNI_FastGetField::generate_fast_get_float_field() {
363 return generate_fast_get_float_field0(T_FLOAT);
364 }
365
366 address JNI_FastGetField::generate_fast_get_double_field() {
367 return generate_fast_get_float_field0(T_DOUBLE);
368 }