1 /*
2 * Copyright (c) 1999, 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 "opto/c2compiler.hpp"
27 #include "opto/compile.hpp"
28 #include "opto/optoreg.hpp"
29 #include "opto/output.hpp"
30 #include "opto/runtime.hpp"
31
32 // register information defined by ADLC
33 extern const char register_save_policy[];
34 extern const int register_save_type[];
35
36 const char* C2Compiler::retry_no_subsuming_loads() {
37 return "retry without subsuming loads";
38 }
39 const char* C2Compiler::retry_no_escape_analysis() {
40 return "retry without escape analysis";
41 }
42 const char* C2Compiler::retry_class_loading_during_parsing() {
43 return "retry class loading during parsing";
44 }
45 bool C2Compiler::init_c2_runtime() {
46
47 // Check assumptions used while running ADLC
48 Compile::adlc_verification();
49 assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
50
51 for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
52 OptoReg::vm2opto[i] = OptoReg::Bad;
53 }
54
55 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
56 VMReg r = OptoReg::as_VMReg(i);
57 if (r->is_valid()) {
58 OptoReg::vm2opto[r->value()] = i;
59 }
60 }
61
62 // Check that runtime and architecture description agree on callee-saved-floats
63 bool callee_saved_floats = false;
64 for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
65 // Is there a callee-saved float or double?
66 if( register_save_policy[i] == 'E' /* callee-saved */ &&
67 (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
68 callee_saved_floats = true;
69 }
70 }
71
72 DEBUG_ONLY( Node::init_NodeProperty(); )
73
74 Compile::pd_compiler2_init();
75
76 CompilerThread* thread = CompilerThread::current();
77
78 HandleMark handle_mark(thread);
79 return OptoRuntime::generate(thread->env());
80 }
81
82 void C2Compiler::initialize() {
83 // The first compiler thread that gets here will initialize the
84 // small amount of global state (and runtime stubs) that C2 needs.
85
86 // There is a race possible once at startup and then we're fine
87
88 // Note that this is being called from a compiler thread not the
89 // main startup thread.
90 if (should_perform_init()) {
91 bool successful = C2Compiler::init_c2_runtime();
92 int new_state = (successful) ? initialized : failed;
93 set_state(new_state);
94 }
95 }
96
97 void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
98 assert(is_initialized(), "Compiler thread must be initialized");
99
100 bool subsume_loads = SubsumeLoads;
101 bool do_escape_analysis = DoEscapeAnalysis && !env->should_retain_local_variables();
102 bool eliminate_boxing = EliminateAutoBox;
103 while (!env->failing()) {
104 // Attempt to compile while subsuming loads into machine instructions.
105 Compile C(env, this, target, entry_bci, subsume_loads, do_escape_analysis, eliminate_boxing);
106
107 // Check result and retry if appropriate.
108 if (C.failure_reason() != NULL) {
109 if (C.failure_reason_is(retry_class_loading_during_parsing())) {
110 env->report_failure(C.failure_reason());
111 continue; // retry
112 }
113 if (C.failure_reason_is(retry_no_subsuming_loads())) {
114 assert(subsume_loads, "must make progress");
115 subsume_loads = false;
116 env->report_failure(C.failure_reason());
117 continue; // retry
118 }
119 if (C.failure_reason_is(retry_no_escape_analysis())) {
120 assert(do_escape_analysis, "must make progress");
121 do_escape_analysis = false;
122 env->report_failure(C.failure_reason());
123 continue; // retry
124 }
125 if (C.has_boxed_value()) {
126 // Recompile without boxing elimination regardless failure reason.
127 assert(eliminate_boxing, "must make progress");
128 eliminate_boxing = false;
129 env->report_failure(C.failure_reason());
130 continue; // retry
131 }
132 // Pass any other failure reason up to the ciEnv.
133 // Note that serious, irreversible failures are already logged
134 // on the ciEnv via env->record_method_not_compilable().
135 env->record_failure(C.failure_reason());
136 }
137 if (StressRecompilation) {
138 if (subsume_loads) {
139 subsume_loads = false;
140 continue; // retry
141 }
142 if (do_escape_analysis) {
143 do_escape_analysis = false;
144 continue; // retry
145 }
146 }
147
148 // print inlining for last compilation only
149 C.dump_print_inlining();
150
151 // No retry; just break the loop.
152 break;
153 }
154 }
155
156 void C2Compiler::print_timers() {
157 Compile::print_timers();
158 }
159
160 bool C2Compiler::is_intrinsic_available(methodHandle method, methodHandle compilation_context) {
161 // Assume a non-virtual dispatch. A virtual dispatch is
162 // possible for only a limited set of available intrinsics whereas
163 // a non-virtual dispatch is possible for all available intrinsics.
164 return is_intrinsic_supported(method, false) &&
165 !is_intrinsic_disabled_by_flag(method, compilation_context);
166 }
167
168 bool C2Compiler::is_intrinsic_supported(methodHandle method, bool is_virtual) {
169 vmIntrinsics::ID id = method->intrinsic_id();
170 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
171
172 if (id < vmIntrinsics::FIRST_ID || id >= vmIntrinsics::LAST_COMPILER_INLINE) {
173 return false;
174 }
175
176 // Only Object.hashCode and Object.clone intrinsics implement also a virtual
177 // dispatch because calling both methods is expensive but both methods are
178 // frequently overridden. All other intrinsics implement only a non-virtual
179 // dispatch.
180 if (is_virtual) {
181 switch (id) {
182 case vmIntrinsics::_hashCode:
183 case vmIntrinsics::_clone:
184 break;
185 default:
186 return false;
187 }
188 }
189
190 switch (id) {
191 case vmIntrinsics::_compareTo:
192 if (!Matcher::match_rule_supported(Op_StrComp)) return false;
193 break;
194 case vmIntrinsics::_equals:
195 if (!Matcher::match_rule_supported(Op_StrEquals)) return false;
196 break;
197 case vmIntrinsics::_equalsC:
198 if (!Matcher::match_rule_supported(Op_AryEq)) return false;
199 break;
200 case vmIntrinsics::_copyMemory:
201 if (StubRoutines::unsafe_arraycopy() == NULL) return false;
202 break;
203 case vmIntrinsics::_encodeISOArray:
204 if (!Matcher::match_rule_supported(Op_EncodeISOArray)) return false;
205 break;
206 case vmIntrinsics::_bitCount_i:
207 if (!Matcher::match_rule_supported(Op_PopCountI)) return false;
208 break;
209 case vmIntrinsics::_bitCount_l:
210 if (!Matcher::match_rule_supported(Op_PopCountL)) return false;
211 break;
212 case vmIntrinsics::_numberOfLeadingZeros_i:
213 if (!Matcher::match_rule_supported(Op_CountLeadingZerosI)) return false;
214 break;
215 case vmIntrinsics::_numberOfLeadingZeros_l:
216 if (!Matcher::match_rule_supported(Op_CountLeadingZerosL)) return false;
217 break;
218 case vmIntrinsics::_numberOfTrailingZeros_i:
219 if (!Matcher::match_rule_supported(Op_CountTrailingZerosI)) return false;
220 break;
221 case vmIntrinsics::_numberOfTrailingZeros_l:
222 if (!Matcher::match_rule_supported(Op_CountTrailingZerosL)) return false;
223 break;
224 case vmIntrinsics::_reverseBytes_c:
225 if (!Matcher::match_rule_supported(Op_ReverseBytesUS)) return false;
226 break;
227 case vmIntrinsics::_reverseBytes_s:
228 if (!Matcher::match_rule_supported(Op_ReverseBytesS)) return false;
229 break;
230 case vmIntrinsics::_reverseBytes_i:
231 if (!Matcher::match_rule_supported(Op_ReverseBytesI)) return false;
232 break;
233 case vmIntrinsics::_reverseBytes_l:
234 if (!Matcher::match_rule_supported(Op_ReverseBytesL)) return false;
235 break;
236 case vmIntrinsics::_compareAndSwapObject:
237 #ifdef _LP64
238 if (!UseCompressedOops && !Matcher::match_rule_supported(Op_CompareAndSwapP)) return false;
239 #endif
240 break;
241 case vmIntrinsics::_compareAndSwapLong:
242 if (!Matcher::match_rule_supported(Op_CompareAndSwapL)) return false;
243 break;
244 case vmIntrinsics::_getAndAddInt:
245 if (!Matcher::match_rule_supported(Op_GetAndAddI)) return false;
246 break;
247 case vmIntrinsics::_getAndAddLong:
248 if (!Matcher::match_rule_supported(Op_GetAndAddL)) return false;
249 break;
250 case vmIntrinsics::_getAndSetInt:
251 if (!Matcher::match_rule_supported(Op_GetAndSetI)) return false;
252 break;
253 case vmIntrinsics::_getAndSetLong:
254 if (!Matcher::match_rule_supported(Op_GetAndSetL)) return false;
255 break;
256 case vmIntrinsics::_getAndSetObject:
257 #ifdef _LP64
258 if (!UseCompressedOops && !Matcher::match_rule_supported(Op_GetAndSetP)) return false;
259 if (UseCompressedOops && !Matcher::match_rule_supported(Op_GetAndSetN)) return false;
260 break;
261 #else
262 if (!Matcher::match_rule_supported(Op_GetAndSetP)) return false;
263 break;
264 #endif
265 case vmIntrinsics::_incrementExactI:
266 case vmIntrinsics::_addExactI:
267 if (!Matcher::match_rule_supported(Op_OverflowAddI)) return false;
268 break;
269 case vmIntrinsics::_incrementExactL:
270 case vmIntrinsics::_addExactL:
271 if (!Matcher::match_rule_supported(Op_OverflowAddL)) return false;
272 break;
273 case vmIntrinsics::_decrementExactI:
274 case vmIntrinsics::_subtractExactI:
275 if (!Matcher::match_rule_supported(Op_OverflowSubI)) return false;
276 break;
277 case vmIntrinsics::_decrementExactL:
278 case vmIntrinsics::_subtractExactL:
279 if (!Matcher::match_rule_supported(Op_OverflowSubL)) return false;
280 break;
281 case vmIntrinsics::_negateExactI:
282 if (!Matcher::match_rule_supported(Op_OverflowSubI)) return false;
283 break;
284 case vmIntrinsics::_negateExactL:
285 if (!Matcher::match_rule_supported(Op_OverflowSubL)) return false;
286 break;
287 case vmIntrinsics::_multiplyExactI:
288 if (!Matcher::match_rule_supported(Op_OverflowMulI)) return false;
289 break;
290 case vmIntrinsics::_multiplyExactL:
291 if (!Matcher::match_rule_supported(Op_OverflowMulL)) return false;
292 break;
293 case vmIntrinsics::_getCallerClass:
294 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL) return false;
295 break;
296 case vmIntrinsics::_hashCode:
297 case vmIntrinsics::_identityHashCode:
298 case vmIntrinsics::_getClass:
299 case vmIntrinsics::_dsin:
300 case vmIntrinsics::_dcos:
301 case vmIntrinsics::_dtan:
302 case vmIntrinsics::_dabs:
303 case vmIntrinsics::_datan2:
304 case vmIntrinsics::_dsqrt:
305 case vmIntrinsics::_dexp:
306 case vmIntrinsics::_dlog:
307 case vmIntrinsics::_dlog10:
308 case vmIntrinsics::_dpow:
309 case vmIntrinsics::_min:
310 case vmIntrinsics::_max:
311 case vmIntrinsics::_arraycopy:
312 case vmIntrinsics::_indexOf:
313 case vmIntrinsics::_getObject:
314 case vmIntrinsics::_getBoolean:
315 case vmIntrinsics::_getByte:
316 case vmIntrinsics::_getShort:
317 case vmIntrinsics::_getChar:
318 case vmIntrinsics::_getInt:
319 case vmIntrinsics::_getLong:
320 case vmIntrinsics::_getFloat:
321 case vmIntrinsics::_getDouble:
322 case vmIntrinsics::_putObject:
323 case vmIntrinsics::_putBoolean:
324 case vmIntrinsics::_putByte:
325 case vmIntrinsics::_putShort:
326 case vmIntrinsics::_putChar:
327 case vmIntrinsics::_putInt:
328 case vmIntrinsics::_putLong:
329 case vmIntrinsics::_putFloat:
330 case vmIntrinsics::_putDouble:
331 case vmIntrinsics::_getByte_raw:
332 case vmIntrinsics::_getShort_raw:
333 case vmIntrinsics::_getChar_raw:
334 case vmIntrinsics::_getInt_raw:
335 case vmIntrinsics::_getLong_raw:
336 case vmIntrinsics::_getFloat_raw:
337 case vmIntrinsics::_getDouble_raw:
338 case vmIntrinsics::_getAddress_raw:
339 case vmIntrinsics::_putByte_raw:
340 case vmIntrinsics::_putShort_raw:
341 case vmIntrinsics::_putChar_raw:
342 case vmIntrinsics::_putInt_raw:
343 case vmIntrinsics::_putLong_raw:
344 case vmIntrinsics::_putFloat_raw:
345 case vmIntrinsics::_putDouble_raw:
346 case vmIntrinsics::_putAddress_raw:
347 case vmIntrinsics::_getObjectVolatile:
348 case vmIntrinsics::_getBooleanVolatile:
349 case vmIntrinsics::_getByteVolatile:
350 case vmIntrinsics::_getShortVolatile:
351 case vmIntrinsics::_getCharVolatile:
352 case vmIntrinsics::_getIntVolatile:
353 case vmIntrinsics::_getLongVolatile:
354 case vmIntrinsics::_getFloatVolatile:
355 case vmIntrinsics::_getDoubleVolatile:
356 case vmIntrinsics::_putObjectVolatile:
357 case vmIntrinsics::_putBooleanVolatile:
358 case vmIntrinsics::_putByteVolatile:
359 case vmIntrinsics::_putShortVolatile:
360 case vmIntrinsics::_putCharVolatile:
361 case vmIntrinsics::_putIntVolatile:
362 case vmIntrinsics::_putLongVolatile:
363 case vmIntrinsics::_putFloatVolatile:
364 case vmIntrinsics::_putDoubleVolatile:
365 case vmIntrinsics::_getShortUnaligned:
366 case vmIntrinsics::_getCharUnaligned:
367 case vmIntrinsics::_getIntUnaligned:
368 case vmIntrinsics::_getLongUnaligned:
369 case vmIntrinsics::_putShortUnaligned:
370 case vmIntrinsics::_putCharUnaligned:
371 case vmIntrinsics::_putIntUnaligned:
372 case vmIntrinsics::_putLongUnaligned:
373 case vmIntrinsics::_compareAndSwapInt:
374 case vmIntrinsics::_putOrderedObject:
375 case vmIntrinsics::_putOrderedInt:
376 case vmIntrinsics::_putOrderedLong:
377 case vmIntrinsics::_loadFence:
378 case vmIntrinsics::_storeFence:
379 case vmIntrinsics::_fullFence:
380 case vmIntrinsics::_currentThread:
381 case vmIntrinsics::_isInterrupted:
382 #ifdef TRACE_HAVE_INTRINSICS
383 case vmIntrinsics::_classID:
384 case vmIntrinsics::_threadID:
385 case vmIntrinsics::_counterTime:
386 #endif
387 case vmIntrinsics::_currentTimeMillis:
388 case vmIntrinsics::_nanoTime:
389 case vmIntrinsics::_allocateInstance:
390 case vmIntrinsics::_newArray:
391 case vmIntrinsics::_getLength:
392 case vmIntrinsics::_copyOf:
393 case vmIntrinsics::_copyOfRange:
394 case vmIntrinsics::_clone:
395 case vmIntrinsics::_isAssignableFrom:
396 case vmIntrinsics::_isInstance:
397 case vmIntrinsics::_getModifiers:
398 case vmIntrinsics::_isInterface:
399 case vmIntrinsics::_isArray:
400 case vmIntrinsics::_isPrimitive:
401 case vmIntrinsics::_getSuperclass:
402 case vmIntrinsics::_getClassAccessFlags:
403 case vmIntrinsics::_floatToRawIntBits:
404 case vmIntrinsics::_floatToIntBits:
405 case vmIntrinsics::_intBitsToFloat:
406 case vmIntrinsics::_doubleToRawLongBits:
407 case vmIntrinsics::_doubleToLongBits:
408 case vmIntrinsics::_longBitsToDouble:
409 case vmIntrinsics::_Reference_get:
410 case vmIntrinsics::_Class_cast:
411 case vmIntrinsics::_aescrypt_encryptBlock:
412 case vmIntrinsics::_aescrypt_decryptBlock:
413 case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
414 case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
415 case vmIntrinsics::_sha_implCompress:
416 case vmIntrinsics::_sha2_implCompress:
417 case vmIntrinsics::_sha5_implCompress:
418 case vmIntrinsics::_digestBase_implCompressMB:
419 case vmIntrinsics::_multiplyToLen:
420 case vmIntrinsics::_squareToLen:
421 case vmIntrinsics::_mulAdd:
422 case vmIntrinsics::_montgomeryMultiply:
423 case vmIntrinsics::_montgomerySquare:
424 case vmIntrinsics::_ghash_processBlocks:
425 case vmIntrinsics::_updateCRC32:
426 case vmIntrinsics::_updateBytesCRC32:
427 case vmIntrinsics::_updateByteBufferCRC32:
428 case vmIntrinsics::_updateBytesCRC32C:
429 case vmIntrinsics::_updateDirectByteBufferCRC32C:
430 case vmIntrinsics::_profileBoolean:
431 case vmIntrinsics::_isCompileConstant:
432 break;
433 default:
434 return false;
435 }
436 return true;
437 }
438
439 bool C2Compiler::is_intrinsic_disabled_by_flag(methodHandle method, methodHandle compilation_context) {
440 vmIntrinsics::ID id = method->intrinsic_id();
441 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
442
443 if (vmIntrinsics::is_disabled_by_flags(method->intrinsic_id())) {
444 return true;
445 }
446
447 // Check if the intrinsic corresponding to 'method' has been disabled on
448 // the command line by using the DisableIntrinsic flag (either globally
449 // or on a per-method level, see src/share/vm/compiler/abstractCompiler.hpp
450 // for details).
451 // Usually, the compilation context is the caller of the method 'method'.
452 // The only case when for a non-recursive method 'method' the compilation context
453 // is not the caller of the 'method' (but it is the method itself) is
454 // java.lang.ref.Referene::get.
455 // For java.lang.ref.Reference::get, the intrinsic version is used
456 // instead of the C2-compiled version so that the value in the referent
457 // field can be registered by the G1 pre-barrier code. The intrinsified
458 // version of Reference::get also adds a memory barrier to prevent
459 // commoning reads from the referent field across safepoint since GC
460 // can change the referent field's value. See Compile::Compile()
461 // in src/share/vm/opto/compile.cpp for more details.
462 ccstr disable_intr = NULL;
463 if ((DisableIntrinsic[0] != '\0' && strstr(DisableIntrinsic, vmIntrinsics::name_at(id)) != NULL) ||
464 (!compilation_context.is_null() &&
465 CompilerOracle::has_option_value(compilation_context, "DisableIntrinsic", disable_intr) &&
466 strstr(disable_intr, vmIntrinsics::name_at(id)) != NULL)
467 ) {
468 return true;
469 }
470
471 // -XX:-InlineNatives disables nearly all intrinsics except the ones listed in
472 // the following switch statement.
473 if (!InlineNatives) {
474 switch (id) {
475 case vmIntrinsics::_indexOf:
476 case vmIntrinsics::_compareTo:
477 case vmIntrinsics::_equals:
478 case vmIntrinsics::_equalsC:
479 case vmIntrinsics::_getAndAddInt:
480 case vmIntrinsics::_getAndAddLong:
481 case vmIntrinsics::_getAndSetInt:
482 case vmIntrinsics::_getAndSetLong:
483 case vmIntrinsics::_getAndSetObject:
484 case vmIntrinsics::_loadFence:
485 case vmIntrinsics::_storeFence:
486 case vmIntrinsics::_fullFence:
487 case vmIntrinsics::_Reference_get:
488 break;
489 default:
490 return true;
491 }
492 }
493
494 if (!InlineUnsafeOps) {
495 switch (id) {
496 case vmIntrinsics::_loadFence:
497 case vmIntrinsics::_storeFence:
498 case vmIntrinsics::_fullFence:
499 case vmIntrinsics::_compareAndSwapObject:
500 case vmIntrinsics::_compareAndSwapLong:
501 case vmIntrinsics::_compareAndSwapInt:
502 return true;
503 default:
504 return false;
505 }
506 }
507
508 return false;
509 }
510
511 int C2Compiler::initial_code_buffer_size() {
512 assert(SegmentedCodeCache, "Should be only used with a segmented code cache");
513 return Compile::MAX_inst_size + Compile::MAX_locs_size + initial_const_capacity;
514 }