1 /*
  2  * Copyright (c) 2020, 2025, 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 "classfile/vmIntrinsics.hpp"
 26 #include "classfile/vmSymbols.hpp"
 27 #include "compiler/compilerDirectives.hpp"
 28 #include "jvm_constants.h"
 29 #include "jvm_io.h"
 30 #ifdef COMPILER2
 31 #include "opto/c2_globals.hpp"
 32 #endif
 33 #include "runtime/vm_version.hpp"
 34 #include "utilities/checkedCast.hpp"
 35 #include "utilities/tribool.hpp"
 36 
 37 // These are flag-matching functions:
 38 inline bool match_F_R(u2 flags) {
 39   const int req = 0;
 40   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED | JVM_ACC_NATIVE;
 41   return (flags & (req | neg)) == req;
 42 }
 43 
 44 inline bool match_F_Y(u2 flags) {
 45   const int req = JVM_ACC_SYNCHRONIZED;
 46   const int neg = JVM_ACC_STATIC | JVM_ACC_NATIVE;
 47   return (flags & (req | neg)) == req;
 48 }
 49 
 50 inline bool match_F_RN(u2 flags) {
 51   const int req = JVM_ACC_NATIVE;
 52   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
 53   return (flags & (req | neg)) == req;
 54 }
 55 
 56 inline bool match_F_S(u2 flags) {
 57   const int req = JVM_ACC_STATIC;
 58   const int neg = JVM_ACC_SYNCHRONIZED | JVM_ACC_NATIVE;
 59   return (flags & (req | neg)) == req;
 60 }
 61 
 62 inline bool match_F_SN(u2 flags) {
 63   const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE;
 64   const int neg = JVM_ACC_SYNCHRONIZED;
 65   return (flags & (req | neg)) == req;
 66 }
 67 
 68 bool vmIntrinsics::preserves_state(vmIntrinsics::ID id) {
 69   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
 70   switch(id) {
 71 #ifdef JFR_HAVE_INTRINSICS
 72   case vmIntrinsics::_counterTime:
 73 #endif
 74   case vmIntrinsics::_currentTimeMillis:
 75   case vmIntrinsics::_nanoTime:
 76   case vmIntrinsics::_floatToRawIntBits:
 77   case vmIntrinsics::_intBitsToFloat:
 78   case vmIntrinsics::_doubleToRawLongBits:
 79   case vmIntrinsics::_longBitsToDouble:
 80   case vmIntrinsics::_getClass:
 81   case vmIntrinsics::_isInstance:
 82   case vmIntrinsics::_currentCarrierThread:
 83   case vmIntrinsics::_currentThread:
 84   case vmIntrinsics::_scopedValueCache:
 85   case vmIntrinsics::_dabs:
 86   case vmIntrinsics::_fabs:
 87   case vmIntrinsics::_iabs:
 88   case vmIntrinsics::_labs:
 89   case vmIntrinsics::_dsqrt:
 90   case vmIntrinsics::_dsqrt_strict:
 91   case vmIntrinsics::_dsin:
 92   case vmIntrinsics::_dcos:
 93   case vmIntrinsics::_dtan:
 94   case vmIntrinsics::_dtanh:
 95   case vmIntrinsics::_dlog:
 96   case vmIntrinsics::_dlog10:
 97   case vmIntrinsics::_dexp:
 98   case vmIntrinsics::_dpow:
 99   case vmIntrinsics::_Preconditions_checkIndex:
100   case vmIntrinsics::_Preconditions_checkLongIndex:
101   case vmIntrinsics::_Reference_get:
102   case vmIntrinsics::_Continuation_doYield:
103   case vmIntrinsics::_updateCRC32:
104   case vmIntrinsics::_updateBytesCRC32:
105   case vmIntrinsics::_updateByteBufferCRC32:
106   case vmIntrinsics::_updateBytesAdler32:
107   case vmIntrinsics::_vectorizedMismatch:
108   case vmIntrinsics::_fmaD:
109   case vmIntrinsics::_fmaF:
110   case vmIntrinsics::_isDigit:
111   case vmIntrinsics::_isLowerCase:
112   case vmIntrinsics::_isUpperCase:
113   case vmIntrinsics::_isWhitespace:
114     return true;
115   default:
116     return false;
117   }
118 }
119 
120 bool vmIntrinsics::can_trap(vmIntrinsics::ID id) {
121   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
122   switch(id) {
123 #ifdef JFR_HAVE_INTRINSICS
124   case vmIntrinsics::_counterTime:
125 #endif
126   case vmIntrinsics::_currentTimeMillis:
127   case vmIntrinsics::_nanoTime:
128   case vmIntrinsics::_floatToRawIntBits:
129   case vmIntrinsics::_intBitsToFloat:
130   case vmIntrinsics::_doubleToRawLongBits:
131   case vmIntrinsics::_longBitsToDouble:
132   case vmIntrinsics::_currentCarrierThread:
133   case vmIntrinsics::_currentThread:
134   case vmIntrinsics::_setCurrentThread:
135   case vmIntrinsics::_scopedValueCache:
136   case vmIntrinsics::_setScopedValueCache:
137   case vmIntrinsics::_dabs:
138   case vmIntrinsics::_fabs:
139   case vmIntrinsics::_iabs:
140   case vmIntrinsics::_labs:
141   case vmIntrinsics::_dsqrt:
142   case vmIntrinsics::_dsqrt_strict:
143   case vmIntrinsics::_dsin:
144   case vmIntrinsics::_dcos:
145   case vmIntrinsics::_dtan:
146   case vmIntrinsics::_dtanh:
147   case vmIntrinsics::_dlog:
148   case vmIntrinsics::_dlog10:
149   case vmIntrinsics::_dexp:
150   case vmIntrinsics::_dpow:
151   case vmIntrinsics::_updateCRC32:
152   case vmIntrinsics::_updateBytesCRC32:
153   case vmIntrinsics::_updateByteBufferCRC32:
154   case vmIntrinsics::_vectorizedMismatch:
155   case vmIntrinsics::_fmaD:
156   case vmIntrinsics::_fmaF:
157     return false;
158   default:
159     return true;
160   }
161 }
162 
163 // Some intrinsics produce different results if they are not pinned
164 bool vmIntrinsics::should_be_pinned(vmIntrinsics::ID id) {
165   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
166   switch(id) {
167 #ifdef JFR_HAVE_INTRINSICS
168   case vmIntrinsics::_counterTime:
169 #endif
170   case vmIntrinsics::_currentTimeMillis:
171   case vmIntrinsics::_nanoTime:
172   case vmIntrinsics::_blackhole:
173     return true;
174   default:
175     return false;
176   }
177 }
178 
179 bool vmIntrinsics::does_virtual_dispatch(vmIntrinsics::ID id) {
180   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
181   switch(id) {
182   case vmIntrinsics::_hashCode:
183   case vmIntrinsics::_clone:
184     return true;
185     break;
186   default:
187     return false;
188   }
189 }
190 
191 int vmIntrinsics::predicates_needed(vmIntrinsics::ID id) {
192   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
193   switch (id) {
194   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
195   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
196   case vmIntrinsics::_electronicCodeBook_encryptAESCrypt:
197   case vmIntrinsics::_electronicCodeBook_decryptAESCrypt:
198   case vmIntrinsics::_counterMode_AESCrypt:
199   case vmIntrinsics::_galoisCounterMode_AESCrypt:
200     return 1;
201   case vmIntrinsics::_digestBase_implCompressMB:
202     return 5;
203   default:
204     return 0;
205   }
206 }
207 
208 bool vmIntrinsics::disabled_by_jvm_flags(vmIntrinsics::ID id) {
209   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
210 
211   // -XX:-InlineNatives disables nearly all intrinsics except the ones listed in
212   // the following switch statement.
213   if (!InlineNatives) {
214     switch (id) {
215     case vmIntrinsics::_indexOfL:
216     case vmIntrinsics::_indexOfU:
217     case vmIntrinsics::_indexOfUL:
218     case vmIntrinsics::_indexOfIL:
219     case vmIntrinsics::_indexOfIU:
220     case vmIntrinsics::_indexOfIUL:
221     case vmIntrinsics::_indexOfU_char:
222     case vmIntrinsics::_indexOfL_char:
223     case vmIntrinsics::_compareToL:
224     case vmIntrinsics::_compareToU:
225     case vmIntrinsics::_compareToLU:
226     case vmIntrinsics::_compareToUL:
227     case vmIntrinsics::_equalsL:
228     case vmIntrinsics::_equalsC:
229     case vmIntrinsics::_vectorizedHashCode:
230     case vmIntrinsics::_getCharStringU:
231     case vmIntrinsics::_putCharStringU:
232     case vmIntrinsics::_compressStringC:
233     case vmIntrinsics::_compressStringB:
234     case vmIntrinsics::_inflateStringC:
235     case vmIntrinsics::_inflateStringB:
236     case vmIntrinsics::_getAndAddInt:
237     case vmIntrinsics::_getAndAddLong:
238     case vmIntrinsics::_getAndSetInt:
239     case vmIntrinsics::_getAndSetLong:
240     case vmIntrinsics::_getAndSetReference:
241     case vmIntrinsics::_loadFence:
242     case vmIntrinsics::_storeFence:
243     case vmIntrinsics::_fullFence:
244     case vmIntrinsics::_countPositives:
245     case vmIntrinsics::_Reference_get:
246     case vmIntrinsics::_Continuation_doYield:
247     case vmIntrinsics::_Continuation_enterSpecial:
248     case vmIntrinsics::_Continuation_pin:
249     case vmIntrinsics::_Continuation_unpin:
250       break;
251     default:
252       return true;
253     }
254   }
255 
256   switch (id) {
257   case vmIntrinsics::_isInstance:
258   case vmIntrinsics::_isAssignableFrom:
259   case vmIntrinsics::_isHidden:
260   case vmIntrinsics::_getSuperclass:
261   case vmIntrinsics::_Class_cast:
262   case vmIntrinsics::_getLength:
263   case vmIntrinsics::_newArray:
264   case vmIntrinsics::_newNullRestrictedNonAtomicArray:
265   case vmIntrinsics::_newNullRestrictedAtomicArray:
266   case vmIntrinsics::_newNullableAtomicArray:
267   case vmIntrinsics::_getClass:
268     if (!InlineClassNatives) return true;
269     break;
270   case vmIntrinsics::_currentCarrierThread:
271   case vmIntrinsics::_currentThread:
272     if (!InlineThreadNatives) return true;
273     break;
274   case vmIntrinsics::_setCurrentThread:
275   case vmIntrinsics::_scopedValueCache:
276   case vmIntrinsics::_setScopedValueCache:
277   case vmIntrinsics::_floatToRawIntBits:
278   case vmIntrinsics::_intBitsToFloat:
279   case vmIntrinsics::_doubleToRawLongBits:
280   case vmIntrinsics::_longBitsToDouble:
281   case vmIntrinsics::_ceil:
282   case vmIntrinsics::_floor:
283   case vmIntrinsics::_rint:
284   case vmIntrinsics::_dabs:
285   case vmIntrinsics::_fabs:
286   case vmIntrinsics::_iabs:
287   case vmIntrinsics::_labs:
288   case vmIntrinsics::_dsqrt:
289   case vmIntrinsics::_dsqrt_strict:
290   case vmIntrinsics::_dsin:
291   case vmIntrinsics::_dcos:
292   case vmIntrinsics::_dtan:
293   case vmIntrinsics::_dtanh:
294   case vmIntrinsics::_dlog:
295   case vmIntrinsics::_dexp:
296   case vmIntrinsics::_dpow:
297   case vmIntrinsics::_dlog10:
298   case vmIntrinsics::_datan2:
299   case vmIntrinsics::_floatToIntBits:
300   case vmIntrinsics::_doubleToLongBits:
301   case vmIntrinsics::_min:
302   case vmIntrinsics::_max:
303   case vmIntrinsics::_maxF:
304   case vmIntrinsics::_minF:
305   case vmIntrinsics::_maxD:
306   case vmIntrinsics::_minD:
307   case vmIntrinsics::_min_strict:
308   case vmIntrinsics::_max_strict:
309   case vmIntrinsics::_maxF_strict:
310   case vmIntrinsics::_minF_strict:
311   case vmIntrinsics::_maxD_strict:
312   case vmIntrinsics::_minD_strict:
313     if (!InlineMathNatives) return true;
314     break;
315   case vmIntrinsics::_fmaD:
316   case vmIntrinsics::_fmaF:
317     if (!InlineMathNatives || !UseFMA) return true;
318     break;
319   case vmIntrinsics::_floatToFloat16:
320   case vmIntrinsics::_float16ToFloat:
321     if (!InlineIntrinsics) return true;
322     break;
323   case vmIntrinsics::_arraycopy:
324     if (!InlineArrayCopy) return true;
325     break;
326   case vmIntrinsics::_updateCRC32:
327   case vmIntrinsics::_updateBytesCRC32:
328   case vmIntrinsics::_updateByteBufferCRC32:
329     if (!UseCRC32Intrinsics) return true;
330     break;
331   case vmIntrinsics::_makePrivateBuffer:
332   case vmIntrinsics::_finishPrivateBuffer:
333   case vmIntrinsics::_getReference:
334   case vmIntrinsics::_getBoolean:
335   case vmIntrinsics::_getByte:
336   case vmIntrinsics::_getShort:
337   case vmIntrinsics::_getChar:
338   case vmIntrinsics::_getInt:
339   case vmIntrinsics::_getLong:
340   case vmIntrinsics::_getFloat:
341   case vmIntrinsics::_getDouble:
342   case vmIntrinsics::_getValue:
343   case vmIntrinsics::_getFlatValue:
344   case vmIntrinsics::_putReference:
345   case vmIntrinsics::_putBoolean:
346   case vmIntrinsics::_putByte:
347   case vmIntrinsics::_putShort:
348   case vmIntrinsics::_putChar:
349   case vmIntrinsics::_putInt:
350   case vmIntrinsics::_putLong:
351   case vmIntrinsics::_putFloat:
352   case vmIntrinsics::_putDouble:
353   case vmIntrinsics::_putValue:
354   case vmIntrinsics::_putFlatValue:
355   case vmIntrinsics::_getReferenceVolatile:
356   case vmIntrinsics::_getBooleanVolatile:
357   case vmIntrinsics::_getByteVolatile:
358   case vmIntrinsics::_getShortVolatile:
359   case vmIntrinsics::_getCharVolatile:
360   case vmIntrinsics::_getIntVolatile:
361   case vmIntrinsics::_getLongVolatile:
362   case vmIntrinsics::_getFloatVolatile:
363   case vmIntrinsics::_getDoubleVolatile:
364   case vmIntrinsics::_putReferenceVolatile:
365   case vmIntrinsics::_putBooleanVolatile:
366   case vmIntrinsics::_putByteVolatile:
367   case vmIntrinsics::_putShortVolatile:
368   case vmIntrinsics::_putCharVolatile:
369   case vmIntrinsics::_putIntVolatile:
370   case vmIntrinsics::_putLongVolatile:
371   case vmIntrinsics::_putFloatVolatile:
372   case vmIntrinsics::_putDoubleVolatile:
373   case vmIntrinsics::_getReferenceAcquire:
374   case vmIntrinsics::_getBooleanAcquire:
375   case vmIntrinsics::_getByteAcquire:
376   case vmIntrinsics::_getShortAcquire:
377   case vmIntrinsics::_getCharAcquire:
378   case vmIntrinsics::_getIntAcquire:
379   case vmIntrinsics::_getLongAcquire:
380   case vmIntrinsics::_getFloatAcquire:
381   case vmIntrinsics::_getDoubleAcquire:
382   case vmIntrinsics::_putReferenceRelease:
383   case vmIntrinsics::_putBooleanRelease:
384   case vmIntrinsics::_putByteRelease:
385   case vmIntrinsics::_putShortRelease:
386   case vmIntrinsics::_putCharRelease:
387   case vmIntrinsics::_putIntRelease:
388   case vmIntrinsics::_putLongRelease:
389   case vmIntrinsics::_putFloatRelease:
390   case vmIntrinsics::_putDoubleRelease:
391   case vmIntrinsics::_getReferenceOpaque:
392   case vmIntrinsics::_getBooleanOpaque:
393   case vmIntrinsics::_getByteOpaque:
394   case vmIntrinsics::_getShortOpaque:
395   case vmIntrinsics::_getCharOpaque:
396   case vmIntrinsics::_getIntOpaque:
397   case vmIntrinsics::_getLongOpaque:
398   case vmIntrinsics::_getFloatOpaque:
399   case vmIntrinsics::_getDoubleOpaque:
400   case vmIntrinsics::_putReferenceOpaque:
401   case vmIntrinsics::_putBooleanOpaque:
402   case vmIntrinsics::_putByteOpaque:
403   case vmIntrinsics::_putShortOpaque:
404   case vmIntrinsics::_putCharOpaque:
405   case vmIntrinsics::_putIntOpaque:
406   case vmIntrinsics::_putLongOpaque:
407   case vmIntrinsics::_putFloatOpaque:
408   case vmIntrinsics::_putDoubleOpaque:
409   case vmIntrinsics::_getAndAddInt:
410   case vmIntrinsics::_getAndAddLong:
411   case vmIntrinsics::_getAndSetInt:
412   case vmIntrinsics::_getAndSetLong:
413   case vmIntrinsics::_getAndSetReference:
414   case vmIntrinsics::_loadFence:
415   case vmIntrinsics::_storeFence:
416   case vmIntrinsics::_fullFence:
417   case vmIntrinsics::_compareAndSetLong:
418   case vmIntrinsics::_weakCompareAndSetLong:
419   case vmIntrinsics::_weakCompareAndSetLongPlain:
420   case vmIntrinsics::_weakCompareAndSetLongAcquire:
421   case vmIntrinsics::_weakCompareAndSetLongRelease:
422   case vmIntrinsics::_compareAndSetInt:
423   case vmIntrinsics::_weakCompareAndSetInt:
424   case vmIntrinsics::_weakCompareAndSetIntPlain:
425   case vmIntrinsics::_weakCompareAndSetIntAcquire:
426   case vmIntrinsics::_weakCompareAndSetIntRelease:
427   case vmIntrinsics::_compareAndSetReference:
428   case vmIntrinsics::_weakCompareAndSetReference:
429   case vmIntrinsics::_weakCompareAndSetReferencePlain:
430   case vmIntrinsics::_weakCompareAndSetReferenceAcquire:
431   case vmIntrinsics::_weakCompareAndSetReferenceRelease:
432   case vmIntrinsics::_compareAndExchangeInt:
433   case vmIntrinsics::_compareAndExchangeIntAcquire:
434   case vmIntrinsics::_compareAndExchangeIntRelease:
435   case vmIntrinsics::_compareAndExchangeLong:
436   case vmIntrinsics::_compareAndExchangeLongAcquire:
437   case vmIntrinsics::_compareAndExchangeLongRelease:
438   case vmIntrinsics::_compareAndExchangeReference:
439   case vmIntrinsics::_compareAndExchangeReferenceAcquire:
440   case vmIntrinsics::_compareAndExchangeReferenceRelease:
441   case vmIntrinsics::_allocateInstance:
442     if (!InlineUnsafeOps) return true;
443     break;
444   case vmIntrinsics::_getShortUnaligned:
445   case vmIntrinsics::_getCharUnaligned:
446   case vmIntrinsics::_getIntUnaligned:
447   case vmIntrinsics::_getLongUnaligned:
448   case vmIntrinsics::_putShortUnaligned:
449   case vmIntrinsics::_putCharUnaligned:
450   case vmIntrinsics::_putIntUnaligned:
451   case vmIntrinsics::_putLongUnaligned:
452     if (!InlineUnsafeOps || !UseUnalignedAccesses) return true;
453     break;
454   case vmIntrinsics::_hashCode:
455     if (!InlineObjectHash) return true;
456     break;
457   case vmIntrinsics::_aescrypt_encryptBlock:
458   case vmIntrinsics::_aescrypt_decryptBlock:
459     if (!UseAESIntrinsics) return true;
460     break;
461   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
462   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
463     if (!UseAESIntrinsics) return true;
464     break;
465   case vmIntrinsics::_electronicCodeBook_encryptAESCrypt:
466   case vmIntrinsics::_electronicCodeBook_decryptAESCrypt:
467     if (!UseAESIntrinsics) return true;
468     break;
469   case vmIntrinsics::_counterMode_AESCrypt:
470     if (!UseAESCTRIntrinsics) return true;
471     break;
472   case vmIntrinsics::_galoisCounterMode_AESCrypt:
473     if (!UseAESIntrinsics) return true;
474     break;
475   case vmIntrinsics::_md5_implCompress:
476     if (!UseMD5Intrinsics) return true;
477     break;
478   case vmIntrinsics::_sha_implCompress:
479     if (!UseSHA1Intrinsics) return true;
480     break;
481   case vmIntrinsics::_sha2_implCompress:
482     if (!UseSHA256Intrinsics) return true;
483     break;
484   case vmIntrinsics::_sha5_implCompress:
485     if (!UseSHA512Intrinsics) return true;
486     break;
487   case vmIntrinsics::_double_keccak:
488   case vmIntrinsics::_sha3_implCompress:
489     if (!UseSHA3Intrinsics) return true;
490     break;
491   case vmIntrinsics::_digestBase_implCompressMB:
492     if (!(UseMD5Intrinsics || UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics || UseSHA3Intrinsics)) return true;
493     break;
494   case vmIntrinsics::_ghash_processBlocks:
495     if (!UseGHASHIntrinsics) return true;
496     break;
497   case vmIntrinsics::_chacha20Block:
498     if (!UseChaCha20Intrinsics) return true;
499     break;
500   case vmIntrinsics::_kyberNtt:
501   case vmIntrinsics::_kyberInverseNtt:
502   case vmIntrinsics::_kyberNttMult:
503   case vmIntrinsics::_kyberAddPoly_2:
504   case vmIntrinsics::_kyberAddPoly_3:
505   case vmIntrinsics::_kyber12To16:
506   case vmIntrinsics::_kyberBarrettReduce:
507     if (!UseKyberIntrinsics) return true;
508   case vmIntrinsics::_dilithiumAlmostNtt:
509   case vmIntrinsics::_dilithiumAlmostInverseNtt:
510   case vmIntrinsics::_dilithiumNttMult:
511   case vmIntrinsics::_dilithiumMontMulByConstant:
512   case vmIntrinsics::_dilithiumDecomposePoly:
513     if (!UseDilithiumIntrinsics) return true;
514     break;
515   case vmIntrinsics::_base64_encodeBlock:
516   case vmIntrinsics::_base64_decodeBlock:
517     if (!UseBASE64Intrinsics) return true;
518     break;
519   case vmIntrinsics::_poly1305_processBlocks:
520     if (!UsePoly1305Intrinsics) return true;
521     break;
522   case vmIntrinsics::_intpoly_montgomeryMult_P256:
523   case vmIntrinsics::_intpoly_assign:
524     if (!UseIntPolyIntrinsics) return true;
525     break;
526   case vmIntrinsics::_updateBytesCRC32C:
527   case vmIntrinsics::_updateDirectByteBufferCRC32C:
528     if (!UseCRC32CIntrinsics) return true;
529     break;
530   case vmIntrinsics::_vectorizedMismatch:
531     if (!UseVectorizedMismatchIntrinsic) return true;
532     break;
533   case vmIntrinsics::_updateBytesAdler32:
534   case vmIntrinsics::_updateByteBufferAdler32:
535     if (!UseAdler32Intrinsics) return true;
536     break;
537   case vmIntrinsics::_copyMemory:
538     if (!InlineArrayCopy || !InlineUnsafeOps) return true;
539     break;
540   case vmIntrinsics::_setMemory:
541     if (!InlineUnsafeOps) return true;
542     break;
543 #ifdef COMPILER2
544   case vmIntrinsics::_clone:
545   case vmIntrinsics::_copyOf:
546   case vmIntrinsics::_copyOfRange:
547     // These intrinsics use both the objectcopy and the arraycopy
548     // intrinsic mechanism.
549     if (!InlineObjectCopy || !InlineArrayCopy) return true;
550     break;
551   case vmIntrinsics::_compareToL:
552   case vmIntrinsics::_compareToU:
553   case vmIntrinsics::_compareToLU:
554   case vmIntrinsics::_compareToUL:
555     if (!SpecialStringCompareTo) return true;
556     break;
557   case vmIntrinsics::_indexOfL:
558   case vmIntrinsics::_indexOfU:
559   case vmIntrinsics::_indexOfUL:
560   case vmIntrinsics::_indexOfIL:
561   case vmIntrinsics::_indexOfIU:
562   case vmIntrinsics::_indexOfIUL:
563   case vmIntrinsics::_indexOfU_char:
564   case vmIntrinsics::_indexOfL_char:
565     if (!SpecialStringIndexOf) return true;
566     break;
567   case vmIntrinsics::_equalsL:
568     if (!SpecialStringEquals) return true;
569     break;
570   case vmIntrinsics::_vectorizedHashCode:
571     if (!UseVectorizedHashCodeIntrinsic) return true;
572     break;
573   case vmIntrinsics::_equalsB:
574   case vmIntrinsics::_equalsC:
575     if (!SpecialArraysEquals) return true;
576     break;
577   case vmIntrinsics::_encodeISOArray:
578   case vmIntrinsics::_encodeAsciiArray:
579   case vmIntrinsics::_encodeByteISOArray:
580     if (!SpecialEncodeISOArray) return true;
581     break;
582   case vmIntrinsics::_getCallerClass:
583     if (!InlineReflectionGetCallerClass) return true;
584     break;
585   case vmIntrinsics::_multiplyToLen:
586     if (!UseMultiplyToLenIntrinsic) return true;
587     break;
588   case vmIntrinsics::_squareToLen:
589     if (!UseSquareToLenIntrinsic) return true;
590     break;
591   case vmIntrinsics::_mulAdd:
592     if (!UseMulAddIntrinsic) return true;
593     break;
594   case vmIntrinsics::_montgomeryMultiply:
595     if (!UseMontgomeryMultiplyIntrinsic) return true;
596     break;
597   case vmIntrinsics::_montgomerySquare:
598     if (!UseMontgomerySquareIntrinsic) return true;
599     break;
600   case vmIntrinsics::_bigIntegerRightShiftWorker:
601   case vmIntrinsics::_bigIntegerLeftShiftWorker:
602     break;
603   case vmIntrinsics::_addExactI:
604   case vmIntrinsics::_addExactL:
605   case vmIntrinsics::_decrementExactI:
606   case vmIntrinsics::_decrementExactL:
607   case vmIntrinsics::_incrementExactI:
608   case vmIntrinsics::_incrementExactL:
609   case vmIntrinsics::_multiplyExactI:
610   case vmIntrinsics::_multiplyExactL:
611   case vmIntrinsics::_negateExactI:
612   case vmIntrinsics::_negateExactL:
613   case vmIntrinsics::_subtractExactI:
614   case vmIntrinsics::_subtractExactL:
615     if (!UseMathExactIntrinsics || !InlineMathNatives) return true;
616     break;
617   case vmIntrinsics::_isDigit:
618   case vmIntrinsics::_isLowerCase:
619   case vmIntrinsics::_isUpperCase:
620   case vmIntrinsics::_isWhitespace:
621     if (!UseCharacterCompareIntrinsics) return true;
622     break;
623   case vmIntrinsics::_dcopySign:
624   case vmIntrinsics::_fcopySign:
625     if (!InlineMathNatives || !UseCopySignIntrinsic) return true;
626     break;
627   case vmIntrinsics::_dsignum:
628   case vmIntrinsics::_fsignum:
629     if (!InlineMathNatives || !UseSignumIntrinsic) return true;
630     break;
631 #endif // COMPILER2
632   default:
633     return false;
634   }
635 
636   return false;
637 }
638 
639 #define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
640 static const char* vm_intrinsic_name_bodies =
641   VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE,
642                    VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
643 
644 static const char* vm_intrinsic_name_table[vmIntrinsics::number_of_intrinsics()];
645 static TriBoolArray<(size_t)vmIntrinsics::number_of_intrinsics(), int> vm_intrinsic_control_words;
646 
647 void vmIntrinsics::init_vm_intrinsic_name_table() {
648   const char** nt = &vm_intrinsic_name_table[0];
649   char* string = (char*) &vm_intrinsic_name_bodies[0];
650 
651   for (auto index : EnumRange<vmIntrinsicID>{}) {
652     nt[as_int(index)] = string;
653     string += strlen(string); // skip string body
654     string += 1;              // skip trailing null
655   }
656   assert(!strcmp(nt[as_int(vmIntrinsics::_hashCode)], "_hashCode"), "lined up");
657   nt[as_int(vmIntrinsics::_none)] = "_none";
658 }
659 
660 const char* vmIntrinsics::name_at(vmIntrinsics::ID id) {
661   const char** nt = &vm_intrinsic_name_table[0];
662   if (nt[as_int(_none)] == nullptr) {
663     init_vm_intrinsic_name_table();
664   }
665 
666   if (id < ID_LIMIT)
667     return vm_intrinsic_name_table[as_int(id)];
668   else
669     return "(unknown intrinsic)";
670 }
671 
672 vmIntrinsics::ID vmIntrinsics::find_id(const char* name) {
673   const char** nt = &vm_intrinsic_name_table[0];
674   if (nt[as_int(_none)] == nullptr) {
675     init_vm_intrinsic_name_table();
676   }
677 
678   for (auto index : EnumRange<vmIntrinsicID>{}) {
679     if (0 == strcmp(name, nt[as_int(index)])) {
680       return index;
681     }
682   }
683 
684   return _none;
685 }
686 
687 bool vmIntrinsics::is_intrinsic_available(vmIntrinsics::ID id) {
688   return VM_Version::is_intrinsic_supported(id) && !is_disabled_by_flags(id);
689 }
690 
691 bool vmIntrinsics::is_disabled_by_flags(vmIntrinsics::ID id) {
692   assert(id > _none && id < ID_LIMIT, "must be a VM intrinsic");
693 
694   // not initialized yet, process Control/DisableIntrinsic
695   if (vm_intrinsic_control_words[as_int(_none)].is_default()) {
696     for (ControlIntrinsicIter iter(ControlIntrinsic); *iter != nullptr; ++iter) {
697       vmIntrinsics::ID id = vmIntrinsics::find_id(*iter);
698 
699       if (id != vmIntrinsics::_none) {
700         vm_intrinsic_control_words[as_int(id)] = iter.is_enabled() && !disabled_by_jvm_flags(id);
701       }
702     }
703 
704     // Order matters, DisableIntrinsic can overwrite ControlIntrinsic
705     for (ControlIntrinsicIter iter(DisableIntrinsic, true/*disable_all*/); *iter != nullptr; ++iter) {
706       vmIntrinsics::ID id = vmIntrinsics::find_id(*iter);
707 
708       if (id != vmIntrinsics::_none) {
709         vm_intrinsic_control_words[as_int(id)] = false;
710       }
711     }
712 
713     vm_intrinsic_control_words[as_int(_none)] = true;
714   }
715 
716   TriBool b = vm_intrinsic_control_words[as_int(id)];
717   if (b.is_default()) {
718     // unknown yet, query and cache it
719     b = vm_intrinsic_control_words[as_int(id)] = !disabled_by_jvm_flags(id);
720   }
721 
722   return !b;
723 }
724 
725 // These are for forming case labels:
726 #define ID3(x, y, z) (( jlong)(z) +                                  \
727                       ((jlong)(y) <<    vmSymbols::log2_SID_LIMIT) + \
728                       ((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT))  )
729 #define SID_ENUM(n) VM_SYMBOL_ENUM_NAME(n)
730 
731 vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbolID holder,
732                                             vmSymbolID name,
733                                             vmSymbolID sig,
734                                             u2 flags) {
735   assert((int)vmSymbolID::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
736 
737   // Let the C compiler build the decision tree.
738 
739 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
740   case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \
741     if (!match_##fcode(flags))  break; \
742     return id;
743 
744   switch (ID3(holder, name, sig)) {
745     VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
746                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
747   }
748   return vmIntrinsics::_none;
749 
750 #undef VM_INTRINSIC_CASE
751 }
752 
753 class vmIntrinsicsLookup {
754   bool _class_map[vmSymbols::number_of_symbols()];
755 
756   constexpr int as_index(vmSymbolID id) const {
757     int index = vmSymbols::as_int(id);
758     assert(0 <= index && index < int(sizeof(_class_map)), "must be");
759     return index;
760   }
761 
762   constexpr void set_class_map(vmSymbolID id) {
763     _class_map[as_index(id)] = true;
764   }
765 
766 public:
767   constexpr vmIntrinsicsLookup() : _class_map() {
768 
769 #define VM_INTRINSIC_CLASS_MAP(id, klass, name, sig, fcode) \
770     set_class_map(SID_ENUM(klass));
771 
772     VM_INTRINSICS_DO(VM_INTRINSIC_CLASS_MAP,
773                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
774 #undef VM_INTRINSIC_CLASS_MAP
775 
776 
777     // A few slightly irregular cases. See Method::init_intrinsic_id
778     set_class_map(SID_ENUM(java_lang_StrictMath));
779     set_class_map(SID_ENUM(java_lang_invoke_MethodHandle));
780     set_class_map(SID_ENUM(java_lang_invoke_VarHandle));
781   }
782 
783   bool class_has_intrinsics(vmSymbolID holder) const {
784     return _class_map[as_index(holder)];
785   }
786 };
787 
788 constexpr vmIntrinsicsLookup _intrinsics_lookup;
789 
790 bool vmIntrinsics::class_has_intrinsics(vmSymbolID holder) {
791   return _intrinsics_lookup.class_has_intrinsics(holder);
792 }
793 
794 const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) {
795   const char* str = name_at(id);
796 #ifndef PRODUCT
797   const char* kname = vmSymbols::name_for(class_for(id));
798   const char* mname = vmSymbols::name_for(name_for(id));
799   const char* sname = vmSymbols::name_for(signature_for(id));
800   const char* fname = "";
801   switch (flags_for(id)) {
802   case F_Y:  fname = "synchronized ";  break;
803   case F_RN: fname = "native ";        break;
804   case F_SN: fname = "native static "; break;
805   case F_S:  fname = "static ";        break;
806   default:   break;
807   }
808   const char* kptr = strrchr(kname, JVM_SIGNATURE_SLASH);
809   if (kptr != nullptr)  kname = kptr + 1;
810   int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s",
811                          str, fname, kname, mname, sname);
812   if (len < buflen)
813     str = buf;
814 #endif //PRODUCT
815   return str;
816 }
817 
818 
819 // These are to get information about intrinsics.
820 
821 #define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f))
822 
823 #ifndef PRODUCT
824 static const jlong intrinsic_info_array[vmIntrinsics::number_of_intrinsics()+1] = {
825 #define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \
826   ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode),
827 
828   0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO,
829                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE)
830   0
831 #undef VM_INTRINSIC_INFO
832 };
833 
834 inline jlong intrinsic_info(vmIntrinsics::ID id) {
835   return intrinsic_info_array[vmIntrinsics::as_int(id)];
836 }
837 
838 vmSymbolID vmIntrinsics::class_for(vmIntrinsics::ID id) {
839   jlong info = intrinsic_info(id);
840   int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
841   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1021, "");
842   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
843 }
844 
845 vmSymbolID vmIntrinsics::name_for(vmIntrinsics::ID id) {
846   jlong info = intrinsic_info(id);
847   int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
848   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1022, "");
849   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
850 }
851 
852 vmSymbolID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
853   jlong info = intrinsic_info(id);
854   int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
855   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1023, "");
856   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
857 }
858 
859 vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
860   jlong info = intrinsic_info(id);
861   int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT);
862   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 7, "");
863   return Flags( (info >> shift) & mask );
864 }
865 #endif // !PRODUCT