vmSymbols.cpp revision 9248:6ab7e19c9220 
1/*
2 * Copyright (c) 1997, 2015, 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.
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23 */
24
25#include "precompiled.hpp"
26#include "classfile/vmSymbols.hpp"
27#include "memory/oopFactory.hpp"
28#include "oops/oop.inline.hpp"
29#include "runtime/handles.inline.hpp"
30#include "utilities/xmlstream.hpp"
31
32
33Symbol* vmSymbols::_symbols[vmSymbols::SID_LIMIT];
34
35Symbol* vmSymbols::_type_signatures[T_VOID+1] = { NULL /*, NULL...*/ };
36
37inline int compare_symbol(Symbol* a, Symbol* b) {
38  if (a == b)  return 0;
39  // follow the natural address order:
40  return (address)a > (address)b ? +1 : -1;
41}
42
43static vmSymbols::SID vm_symbol_index[vmSymbols::SID_LIMIT];
44extern "C" {
45  static int compare_vmsymbol_sid(const void* void_a, const void* void_b) {
46    Symbol* a = vmSymbols::symbol_at(*((vmSymbols::SID*) void_a));
47    Symbol* b = vmSymbols::symbol_at(*((vmSymbols::SID*) void_b));
48    return compare_symbol(a, b);
49  }
50}
51
52#ifdef ASSERT
53#define VM_SYMBOL_ENUM_NAME_BODY(name, string) #name "\0"
54static const char* vm_symbol_enum_names =
55  VM_SYMBOLS_DO(VM_SYMBOL_ENUM_NAME_BODY, VM_ALIAS_IGNORE)
56  "\0";
57static const char* vm_symbol_enum_name(vmSymbols::SID sid) {
58  const char* string = &vm_symbol_enum_names[0];
59  int skip = (int)sid - (int)vmSymbols::FIRST_SID;
60  for (; skip != 0; skip--) {
61    size_t skiplen = strlen(string);
62    if (skiplen == 0)  return "<unknown>";  // overflow
63    string += skiplen+1;
64  }
65  return string;
66}
67#endif //ASSERT
68
69// Put all the VM symbol strings in one place.
70// Makes for a more compact libjvm.
71#define VM_SYMBOL_BODY(name, string) string "\0"
72static const char* vm_symbol_bodies = VM_SYMBOLS_DO(VM_SYMBOL_BODY, VM_ALIAS_IGNORE);
73
74void vmSymbols::initialize(TRAPS) {
75  assert((int)SID_LIMIT <= (1<<log2_SID_LIMIT), "must fit in this bitfield");
76  assert((int)SID_LIMIT*5 > (1<<log2_SID_LIMIT), "make the bitfield smaller, please");
77  assert(vmIntrinsics::FLAG_LIMIT <= (1 << vmIntrinsics::log2_FLAG_LIMIT), "must fit in this bitfield");
78
79  if (!UseSharedSpaces) {
80    const char* string = &vm_symbol_bodies[0];
81    for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
82      Symbol* sym = SymbolTable::new_permanent_symbol(string, CHECK);
83      _symbols[index] = sym;
84      string += strlen(string); // skip string body
85      string += 1;              // skip trailing null
86    }
87
88    _type_signatures[T_BYTE]    = byte_signature();
89    _type_signatures[T_CHAR]    = char_signature();
90    _type_signatures[T_DOUBLE]  = double_signature();
91    _type_signatures[T_FLOAT]   = float_signature();
92    _type_signatures[T_INT]     = int_signature();
93    _type_signatures[T_LONG]    = long_signature();
94    _type_signatures[T_SHORT]   = short_signature();
95    _type_signatures[T_BOOLEAN] = bool_signature();
96    _type_signatures[T_VOID]    = void_signature();
97    // no single signatures for T_OBJECT or T_ARRAY
98  }
99
100#ifdef ASSERT
101  // Check for duplicates:
102  for (int i1 = (int)FIRST_SID; i1 < (int)SID_LIMIT; i1++) {
103    Symbol* sym = symbol_at((SID)i1);
104    for (int i2 = (int)FIRST_SID; i2 < i1; i2++) {
105      if (symbol_at((SID)i2) == sym) {
106        tty->print("*** Duplicate VM symbol SIDs %s(%d) and %s(%d): \"",
107                   vm_symbol_enum_name((SID)i2), i2,
108                   vm_symbol_enum_name((SID)i1), i1);
109        sym->print_symbol_on(tty);
110        tty->print_cr("\"");
111      }
112    }
113  }
114#endif //ASSERT
115
116  // Create an index for find_id:
117  {
118    for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
119      vm_symbol_index[index] = (SID)index;
120    }
121    int num_sids = SID_LIMIT-FIRST_SID;
122    qsort(&vm_symbol_index[FIRST_SID], num_sids, sizeof(vm_symbol_index[0]),
123          compare_vmsymbol_sid);
124  }
125
126#ifdef ASSERT
127  {
128    // Spot-check correspondence between strings, symbols, and enums:
129    assert(_symbols[NO_SID] == NULL, "must be");
130    const char* str = "java/lang/Object";
131    TempNewSymbol jlo = SymbolTable::new_permanent_symbol(str, CHECK);
132    assert(strncmp(str, (char*)jlo->base(), jlo->utf8_length()) == 0, "");
133    assert(jlo == java_lang_Object(), "");
134    SID sid = VM_SYMBOL_ENUM_NAME(java_lang_Object);
135    assert(find_sid(jlo) == sid, "");
136    assert(symbol_at(sid) == jlo, "");
137
138    // Make sure find_sid produces the right answer in each case.
139    for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
140      Symbol* sym = symbol_at((SID)index);
141      sid = find_sid(sym);
142      assert(sid == (SID)index, "symbol index works");
143      // Note:  If there are duplicates, this assert will fail.
144      // A "Duplicate VM symbol" message will have already been printed.
145    }
146
147    // The string "format" happens (at the moment) not to be a vmSymbol,
148    // though it is a method name in java.lang.String.
149    str = "format";
150    TempNewSymbol fmt = SymbolTable::new_permanent_symbol(str, CHECK);
151    sid = find_sid(fmt);
152    assert(sid == NO_SID, "symbol index works (negative test)");
153  }
154#endif
155}
156
157
158#ifndef PRODUCT
159const char* vmSymbols::name_for(vmSymbols::SID sid) {
160  if (sid == NO_SID)
161    return "NO_SID";
162  const char* string = &vm_symbol_bodies[0];
163  for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
164    if (index == (int)sid)
165      return string;
166    string += strlen(string); // skip string body
167    string += 1;              // skip trailing null
168  }
169  return "BAD_SID";
170}
171#endif
172
173
174
175void vmSymbols::symbols_do(SymbolClosure* f) {
176  for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
177    f->do_symbol(&_symbols[index]);
178  }
179  for (int i = 0; i < T_VOID+1; i++) {
180    f->do_symbol(&_type_signatures[i]);
181  }
182}
183
184void vmSymbols::serialize(SerializeClosure* soc) {
185  soc->do_region((u_char*)&_symbols[FIRST_SID],
186                 (SID_LIMIT - FIRST_SID) * sizeof(_symbols[0]));
187  soc->do_region((u_char*)_type_signatures, sizeof(_type_signatures));
188}
189
190
191BasicType vmSymbols::signature_type(Symbol* s) {
192  assert(s != NULL, "checking");
193  for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
194    if (s == _type_signatures[i]) {
195      return (BasicType)i;
196    }
197  }
198  return T_OBJECT;
199}
200
201
202static int mid_hint = (int)vmSymbols::FIRST_SID+1;
203
204#ifndef PRODUCT
205static int find_sid_calls, find_sid_probes;
206// (Typical counts are calls=7000 and probes=17000.)
207#endif
208
209vmSymbols::SID vmSymbols::find_sid(Symbol* symbol) {
210  // Handle the majority of misses by a bounds check.
211  // Then, use a binary search over the index.
212  // Expected trip count is less than log2_SID_LIMIT, about eight.
213  // This is slow but acceptable, given that calls are not
214  // dynamically common.  (Method*::intrinsic_id has a cache.)
215  NOT_PRODUCT(find_sid_calls++);
216  int min = (int)FIRST_SID, max = (int)SID_LIMIT - 1;
217  SID sid = NO_SID, sid1;
218  int cmp1;
219  sid1 = vm_symbol_index[min];
220  cmp1 = compare_symbol(symbol, symbol_at(sid1));
221  if (cmp1 <= 0) {              // before the first
222    if (cmp1 == 0)  sid = sid1;
223  } else {
224    sid1 = vm_symbol_index[max];
225    cmp1 = compare_symbol(symbol, symbol_at(sid1));
226    if (cmp1 >= 0) {            // after the last
227      if (cmp1 == 0)  sid = sid1;
228    } else {
229      // After checking the extremes, do a binary search.
230      ++min; --max;             // endpoints are done
231      int mid = mid_hint;       // start at previous success
232      while (max >= min) {
233        assert(mid >= min && mid <= max, "");
234        NOT_PRODUCT(find_sid_probes++);
235        sid1 = vm_symbol_index[mid];
236        cmp1 = compare_symbol(symbol, symbol_at(sid1));
237        if (cmp1 == 0) {
238          mid_hint = mid;
239          sid = sid1;
240          break;
241        }
242        if (cmp1 < 0)
243          max = mid - 1;        // symbol < symbol_at(sid)
244        else
245          min = mid + 1;
246
247        // Pick a new probe point:
248        mid = (max + min) / 2;
249      }
250    }
251  }
252
253#ifdef ASSERT
254  // Perform the exhaustive self-check the first 1000 calls,
255  // and every 100 calls thereafter.
256  static int find_sid_check_count = -2000;
257  if ((uint)++find_sid_check_count > (uint)100) {
258    if (find_sid_check_count > 0)  find_sid_check_count = 0;
259
260    // Make sure this is the right answer, using linear search.
261    // (We have already proven that there are no duplicates in the list.)
262    SID sid2 = NO_SID;
263    for (int index = (int)FIRST_SID; index < (int)SID_LIMIT; index++) {
264      Symbol* sym2 = symbol_at((SID)index);
265      if (sym2 == symbol) {
266        sid2 = (SID)index;
267        break;
268      }
269    }
270    // Unless it's a duplicate, assert that the sids are the same.
271    if (_symbols[sid] != _symbols[sid2]) {
272      assert(sid == sid2, "binary same as linear search");
273    }
274  }
275#endif //ASSERT
276
277  return sid;
278}
279
280vmSymbols::SID vmSymbols::find_sid(const char* symbol_name) {
281  Symbol* symbol = SymbolTable::probe(symbol_name, (int) strlen(symbol_name));
282  if (symbol == NULL)  return NO_SID;
283  return find_sid(symbol);
284}
285
286static vmIntrinsics::ID wrapper_intrinsic(BasicType type, bool unboxing) {
287#define TYPE2(type, unboxing) ((int)(type)*2 + ((unboxing) ? 1 : 0))
288  switch (TYPE2(type, unboxing)) {
289#define BASIC_TYPE_CASE(type, box, unbox) \
290    case TYPE2(type, false):  return vmIntrinsics::box; \
291    case TYPE2(type, true):   return vmIntrinsics::unbox
292    BASIC_TYPE_CASE(T_BOOLEAN, _Boolean_valueOf,   _booleanValue);
293    BASIC_TYPE_CASE(T_BYTE,    _Byte_valueOf,      _byteValue);
294    BASIC_TYPE_CASE(T_CHAR,    _Character_valueOf, _charValue);
295    BASIC_TYPE_CASE(T_SHORT,   _Short_valueOf,     _shortValue);
296    BASIC_TYPE_CASE(T_INT,     _Integer_valueOf,   _intValue);
297    BASIC_TYPE_CASE(T_LONG,    _Long_valueOf,      _longValue);
298    BASIC_TYPE_CASE(T_FLOAT,   _Float_valueOf,     _floatValue);
299    BASIC_TYPE_CASE(T_DOUBLE,  _Double_valueOf,    _doubleValue);
300#undef BASIC_TYPE_CASE
301  }
302#undef TYPE2
303  return vmIntrinsics::_none;
304}
305
306vmIntrinsics::ID vmIntrinsics::for_boxing(BasicType type) {
307  return wrapper_intrinsic(type, false);
308}
309vmIntrinsics::ID vmIntrinsics::for_unboxing(BasicType type) {
310  return wrapper_intrinsic(type, true);
311}
312
313vmIntrinsics::ID vmIntrinsics::for_raw_conversion(BasicType src, BasicType dest) {
314#define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
315  switch (SRC_DEST(src, dest)) {
316  case SRC_DEST(T_INT, T_FLOAT):   return vmIntrinsics::_intBitsToFloat;
317  case SRC_DEST(T_FLOAT, T_INT):   return vmIntrinsics::_floatToRawIntBits;
318
319  case SRC_DEST(T_LONG, T_DOUBLE): return vmIntrinsics::_longBitsToDouble;
320  case SRC_DEST(T_DOUBLE, T_LONG): return vmIntrinsics::_doubleToRawLongBits;
321  }
322#undef SRC_DEST
323
324  return vmIntrinsics::_none;
325}
326
327bool vmIntrinsics::preserves_state(vmIntrinsics::ID id) {
328  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
329  switch(id) {
330#ifdef TRACE_HAVE_INTRINSICS
331  case vmIntrinsics::_classID:
332  case vmIntrinsics::_threadID:
333  case vmIntrinsics::_counterTime:
334#endif
335  case vmIntrinsics::_currentTimeMillis:
336  case vmIntrinsics::_nanoTime:
337  case vmIntrinsics::_floatToRawIntBits:
338  case vmIntrinsics::_intBitsToFloat:
339  case vmIntrinsics::_doubleToRawLongBits:
340  case vmIntrinsics::_longBitsToDouble:
341  case vmIntrinsics::_getClass:
342  case vmIntrinsics::_isInstance:
343  case vmIntrinsics::_currentThread:
344  case vmIntrinsics::_dabs:
345  case vmIntrinsics::_dsqrt:
346  case vmIntrinsics::_dsin:
347  case vmIntrinsics::_dcos:
348  case vmIntrinsics::_dtan:
349  case vmIntrinsics::_dlog:
350  case vmIntrinsics::_dlog10:
351  case vmIntrinsics::_dexp:
352  case vmIntrinsics::_dpow:
353  case vmIntrinsics::_checkIndex:
354  case vmIntrinsics::_Reference_get:
355  case vmIntrinsics::_updateCRC32:
356  case vmIntrinsics::_updateBytesCRC32:
357  case vmIntrinsics::_updateByteBufferCRC32:
358    return true;
359  default:
360    return false;
361  }
362}
363
364bool vmIntrinsics::can_trap(vmIntrinsics::ID id) {
365  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
366  switch(id) {
367#ifdef TRACE_HAVE_INTRINSICS
368  case vmIntrinsics::_counterTime:
369#endif
370  case vmIntrinsics::_currentTimeMillis:
371  case vmIntrinsics::_nanoTime:
372  case vmIntrinsics::_floatToRawIntBits:
373  case vmIntrinsics::_intBitsToFloat:
374  case vmIntrinsics::_doubleToRawLongBits:
375  case vmIntrinsics::_longBitsToDouble:
376  case vmIntrinsics::_currentThread:
377  case vmIntrinsics::_dabs:
378  case vmIntrinsics::_dsqrt:
379  case vmIntrinsics::_dsin:
380  case vmIntrinsics::_dcos:
381  case vmIntrinsics::_dtan:
382  case vmIntrinsics::_dlog:
383  case vmIntrinsics::_dlog10:
384  case vmIntrinsics::_dexp:
385  case vmIntrinsics::_dpow:
386  case vmIntrinsics::_updateCRC32:
387  case vmIntrinsics::_updateBytesCRC32:
388  case vmIntrinsics::_updateByteBufferCRC32:
389    return false;
390  default:
391    return true;
392  }
393}
394
395bool vmIntrinsics::does_virtual_dispatch(vmIntrinsics::ID id) {
396  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
397  switch(id) {
398  case vmIntrinsics::_hashCode:
399  case vmIntrinsics::_clone:
400    return true;
401    break;
402  default:
403    return false;
404  }
405}
406
407int vmIntrinsics::predicates_needed(vmIntrinsics::ID id) {
408  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
409  switch (id) {
410  case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
411  case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
412    return 1;
413  case vmIntrinsics::_digestBase_implCompressMB:
414    return 3;
415  default:
416    return 0;
417  }
418}
419
420bool vmIntrinsics::is_disabled_by_flags(const methodHandle& method, const methodHandle& compilation_context) {
421  vmIntrinsics::ID id = method->intrinsic_id();
422  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
423
424  // Check if the intrinsic corresponding to 'method' has been disabled on
425  // the command line by using the DisableIntrinsic flag (either globally
426  // or on a per-method level, see src/share/vm/compiler/abstractCompiler.hpp
427  // for details).
428  // Usually, the compilation context is the caller of the method 'method'.
429  // The only case when for a non-recursive method 'method' the compilation context
430  // is not the caller of the 'method' (but it is the method itself) is
431  // java.lang.ref.Referene::get.
432  // For java.lang.ref.Reference::get, the intrinsic version is used
433  // instead of the compiled version so that the value in the referent
434  // field can be registered by the G1 pre-barrier code. The intrinsified
435  // version of Reference::get also adds a memory barrier to prevent
436  // commoning reads from the referent field across safepoint since GC
437  // can change the referent field's value. See Compile::Compile()
438  // in src/share/vm/opto/compile.cpp or
439  // GraphBuilder::GraphBuilder() in src/share/vm/c1/c1_GraphBuilder.cpp
440  // for more details.
441  ccstr disable_intr = NULL;
442  if ((DisableIntrinsic[0] != '\0' && strstr(DisableIntrinsic, vmIntrinsics::name_at(id)) != NULL) ||
443      (!compilation_context.is_null() &&
444       CompilerOracle::has_option_value(compilation_context, "DisableIntrinsic", disable_intr) &&
445       strstr(disable_intr, vmIntrinsics::name_at(id)) != NULL)
446  ) {
447    return true;
448  }
449
450  // -XX:-InlineNatives disables nearly all intrinsics except the ones listed in
451  // the following switch statement.
452  if (!InlineNatives) {
453    switch (id) {
454    case vmIntrinsics::_indexOf:
455    case vmIntrinsics::_compareTo:
456    case vmIntrinsics::_equals:
457    case vmIntrinsics::_equalsC:
458    case vmIntrinsics::_getAndAddInt:
459    case vmIntrinsics::_getAndAddLong:
460    case vmIntrinsics::_getAndSetInt:
461    case vmIntrinsics::_getAndSetLong:
462    case vmIntrinsics::_getAndSetObject:
463    case vmIntrinsics::_loadFence:
464    case vmIntrinsics::_storeFence:
465    case vmIntrinsics::_fullFence:
466    case vmIntrinsics::_Reference_get:
467      break;
468    default:
469      return true;
470    }
471  }
472
473  switch (id) {
474  case vmIntrinsics::_isInstance:
475  case vmIntrinsics::_isAssignableFrom:
476  case vmIntrinsics::_getModifiers:
477  case vmIntrinsics::_isInterface:
478  case vmIntrinsics::_isArray:
479  case vmIntrinsics::_isPrimitive:
480  case vmIntrinsics::_getSuperclass:
481  case vmIntrinsics::_Class_cast:
482  case vmIntrinsics::_getLength:
483  case vmIntrinsics::_newArray:
484  case vmIntrinsics::_getClass:
485    if (!InlineClassNatives) return true;
486    break;
487  case vmIntrinsics::_currentThread:
488  case vmIntrinsics::_isInterrupted:
489    if (!InlineThreadNatives) return true;
490    break;
491  case vmIntrinsics::_floatToRawIntBits:
492  case vmIntrinsics::_intBitsToFloat:
493  case vmIntrinsics::_doubleToRawLongBits:
494  case vmIntrinsics::_longBitsToDouble:
495  case vmIntrinsics::_dabs:
496  case vmIntrinsics::_dsqrt:
497  case vmIntrinsics::_dsin:
498  case vmIntrinsics::_dcos:
499  case vmIntrinsics::_dtan:
500  case vmIntrinsics::_dlog:
501  case vmIntrinsics::_dexp:
502  case vmIntrinsics::_dpow:
503  case vmIntrinsics::_dlog10:
504  case vmIntrinsics::_datan2:
505  case vmIntrinsics::_min:
506  case vmIntrinsics::_max:
507  case vmIntrinsics::_floatToIntBits:
508  case vmIntrinsics::_doubleToLongBits:
509    if (!InlineMathNatives) return true;
510    break;
511  case vmIntrinsics::_arraycopy:
512    if (!InlineArrayCopy) return true;
513    break;
514  case vmIntrinsics::_updateCRC32:
515  case vmIntrinsics::_updateBytesCRC32:
516  case vmIntrinsics::_updateByteBufferCRC32:
517    if (!UseCRC32Intrinsics) return true;
518    break;
519  case vmIntrinsics::_getObject:
520  case vmIntrinsics::_getBoolean:
521  case vmIntrinsics::_getByte:
522  case vmIntrinsics::_getShort:
523  case vmIntrinsics::_getChar:
524  case vmIntrinsics::_getInt:
525  case vmIntrinsics::_getLong:
526  case vmIntrinsics::_getFloat:
527  case vmIntrinsics::_getDouble:
528  case vmIntrinsics::_putObject:
529  case vmIntrinsics::_putBoolean:
530  case vmIntrinsics::_putByte:
531  case vmIntrinsics::_putShort:
532  case vmIntrinsics::_putChar:
533  case vmIntrinsics::_putInt:
534  case vmIntrinsics::_putLong:
535  case vmIntrinsics::_putFloat:
536  case vmIntrinsics::_putDouble:
537  case vmIntrinsics::_getObjectVolatile:
538  case vmIntrinsics::_getBooleanVolatile:
539  case vmIntrinsics::_getByteVolatile:
540  case vmIntrinsics::_getShortVolatile:
541  case vmIntrinsics::_getCharVolatile:
542  case vmIntrinsics::_getIntVolatile:
543  case vmIntrinsics::_getLongVolatile:
544  case vmIntrinsics::_getFloatVolatile:
545  case vmIntrinsics::_getDoubleVolatile:
546  case vmIntrinsics::_putObjectVolatile:
547  case vmIntrinsics::_putBooleanVolatile:
548  case vmIntrinsics::_putByteVolatile:
549  case vmIntrinsics::_putShortVolatile:
550  case vmIntrinsics::_putCharVolatile:
551  case vmIntrinsics::_putIntVolatile:
552  case vmIntrinsics::_putLongVolatile:
553  case vmIntrinsics::_putFloatVolatile:
554  case vmIntrinsics::_putDoubleVolatile:
555  case vmIntrinsics::_getByte_raw:
556  case vmIntrinsics::_getShort_raw:
557  case vmIntrinsics::_getChar_raw:
558  case vmIntrinsics::_getInt_raw:
559  case vmIntrinsics::_getLong_raw:
560  case vmIntrinsics::_getFloat_raw:
561  case vmIntrinsics::_getDouble_raw:
562  case vmIntrinsics::_putByte_raw:
563  case vmIntrinsics::_putShort_raw:
564  case vmIntrinsics::_putChar_raw:
565  case vmIntrinsics::_putInt_raw:
566  case vmIntrinsics::_putLong_raw:
567  case vmIntrinsics::_putFloat_raw:
568  case vmIntrinsics::_putDouble_raw:
569  case vmIntrinsics::_putOrderedObject:
570  case vmIntrinsics::_putOrderedLong:
571  case vmIntrinsics::_putOrderedInt:
572  case vmIntrinsics::_getAndAddInt:
573  case vmIntrinsics::_getAndAddLong:
574  case vmIntrinsics::_getAndSetInt:
575  case vmIntrinsics::_getAndSetLong:
576  case vmIntrinsics::_getAndSetObject:
577  case vmIntrinsics::_loadFence:
578  case vmIntrinsics::_storeFence:
579  case vmIntrinsics::_fullFence:
580  case vmIntrinsics::_compareAndSwapObject:
581  case vmIntrinsics::_compareAndSwapLong:
582  case vmIntrinsics::_compareAndSwapInt:
583    if (!InlineUnsafeOps) return true;
584    break;
585  case vmIntrinsics::_getShortUnaligned:
586  case vmIntrinsics::_getCharUnaligned:
587  case vmIntrinsics::_getIntUnaligned:
588  case vmIntrinsics::_getLongUnaligned:
589  case vmIntrinsics::_putShortUnaligned:
590  case vmIntrinsics::_putCharUnaligned:
591  case vmIntrinsics::_putIntUnaligned:
592  case vmIntrinsics::_putLongUnaligned:
593  case vmIntrinsics::_allocateInstance:
594  case vmIntrinsics::_getAddress_raw:
595  case vmIntrinsics::_putAddress_raw:
596    if (!InlineUnsafeOps || !UseUnalignedAccesses) return true;
597    break;
598  case vmIntrinsics::_hashCode:
599    if (!InlineObjectHash) return true;
600    break;
601  case vmIntrinsics::_aescrypt_encryptBlock:
602  case vmIntrinsics::_aescrypt_decryptBlock:
603    if (!UseAESIntrinsics) return true;
604    break;
605  case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
606  case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
607    if (!UseAESIntrinsics) return true;
608    break;
609  case vmIntrinsics::_sha_implCompress:
610    if (!UseSHA1Intrinsics) return true;
611    break;
612  case vmIntrinsics::_sha2_implCompress:
613    if (!UseSHA256Intrinsics) return true;
614    break;
615  case vmIntrinsics::_sha5_implCompress:
616    if (!UseSHA512Intrinsics) return true;
617    break;
618  case vmIntrinsics::_digestBase_implCompressMB:
619    if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) return true;
620    break;
621  case vmIntrinsics::_ghash_processBlocks:
622    if (!UseGHASHIntrinsics) return true;
623    break;
624  case vmIntrinsics::_updateBytesCRC32C:
625  case vmIntrinsics::_updateDirectByteBufferCRC32C:
626    if (!UseCRC32CIntrinsics) return true;
627    break;
628  case vmIntrinsics::_updateBytesAdler32:
629  case vmIntrinsics::_updateByteBufferAdler32:
630    if (!UseAdler32Intrinsics) return true;
631    break;
632  case vmIntrinsics::_copyMemory:
633    if (!InlineArrayCopy || !InlineUnsafeOps) return true;
634    break;
635#ifdef COMPILER1
636  case vmIntrinsics::_checkIndex:
637    if (!InlineNIOCheckIndex) return true;
638    break;
639#endif // COMPILER1
640#ifdef COMPILER2
641  case vmIntrinsics::_clone:
642  case vmIntrinsics::_copyOf:
643  case vmIntrinsics::_copyOfRange:
644    // These intrinsics use both the objectcopy and the arraycopy
645    // intrinsic mechanism.
646    if (!InlineObjectCopy || !InlineArrayCopy) return true;
647    break;
648  case vmIntrinsics::_compareTo:
649    if (!SpecialStringCompareTo) return true;
650    break;
651  case vmIntrinsics::_indexOf:
652    if (!SpecialStringIndexOf) return true;
653    break;
654  case vmIntrinsics::_equals:
655    if (!SpecialStringEquals) return true;
656    break;
657  case vmIntrinsics::_equalsC:
658    if (!SpecialArraysEquals) return true;
659    break;
660  case vmIntrinsics::_encodeISOArray:
661    if (!SpecialEncodeISOArray) return true;
662    break;
663  case vmIntrinsics::_getCallerClass:
664    if (!InlineReflectionGetCallerClass) return true;
665    break;
666  case vmIntrinsics::_multiplyToLen:
667    if (!UseMultiplyToLenIntrinsic) return true;
668    break;
669  case vmIntrinsics::_squareToLen:
670    if (!UseSquareToLenIntrinsic) return true;
671    break;
672  case vmIntrinsics::_mulAdd:
673    if (!UseMulAddIntrinsic) return true;
674    break;
675  case vmIntrinsics::_montgomeryMultiply:
676    if (!UseMontgomeryMultiplyIntrinsic) return true;
677    break;
678  case vmIntrinsics::_montgomerySquare:
679    if (!UseMontgomerySquareIntrinsic) return true;
680    break;
681  case vmIntrinsics::_addExactI:
682  case vmIntrinsics::_addExactL:
683  case vmIntrinsics::_decrementExactI:
684  case vmIntrinsics::_decrementExactL:
685  case vmIntrinsics::_incrementExactI:
686  case vmIntrinsics::_incrementExactL:
687  case vmIntrinsics::_multiplyExactI:
688  case vmIntrinsics::_multiplyExactL:
689  case vmIntrinsics::_negateExactI:
690  case vmIntrinsics::_negateExactL:
691  case vmIntrinsics::_subtractExactI:
692  case vmIntrinsics::_subtractExactL:
693    if (!UseMathExactIntrinsics || !InlineMathNatives) return true;
694    break;
695#endif // COMPILER2
696  default:
697    return false;
698  }
699
700  return false;
701}
702
703#define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
704static const char* vm_intrinsic_name_bodies =
705  VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE,
706                   VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
707
708static const char* vm_intrinsic_name_table[vmIntrinsics::ID_LIMIT];
709
710const char* vmIntrinsics::name_at(vmIntrinsics::ID id) {
711  const char** nt = &vm_intrinsic_name_table[0];
712  if (nt[_none] == NULL) {
713    char* string = (char*) &vm_intrinsic_name_bodies[0];
714    for (int index = FIRST_ID; index < ID_LIMIT; index++) {
715      nt[index] = string;
716      string += strlen(string); // skip string body
717      string += 1;              // skip trailing null
718    }
719    assert(!strcmp(nt[_hashCode], "_hashCode"), "lined up");
720    nt[_none] = "_none";
721  }
722  if ((uint)id < (uint)ID_LIMIT)
723    return vm_intrinsic_name_table[(uint)id];
724  else
725    return "(unknown intrinsic)";
726}
727
728// These are flag-matching functions:
729inline bool match_F_R(jshort flags) {
730  const int req = 0;
731  const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
732  return (flags & (req | neg)) == req;
733}
734inline bool match_F_Y(jshort flags) {
735  const int req = JVM_ACC_SYNCHRONIZED;
736  const int neg = JVM_ACC_STATIC;
737  return (flags & (req | neg)) == req;
738}
739inline bool match_F_RN(jshort flags) {
740  const int req = JVM_ACC_NATIVE;
741  const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
742  return (flags & (req | neg)) == req;
743}
744inline bool match_F_S(jshort flags) {
745  const int req = JVM_ACC_STATIC;
746  const int neg = JVM_ACC_SYNCHRONIZED;
747  return (flags & (req | neg)) == req;
748}
749inline bool match_F_SN(jshort flags) {
750  const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE;
751  const int neg = JVM_ACC_SYNCHRONIZED;
752  return (flags & (req | neg)) == req;
753}
754inline bool match_F_RNY(jshort flags) {
755  const int req = JVM_ACC_NATIVE | JVM_ACC_SYNCHRONIZED;
756  const int neg = JVM_ACC_STATIC;
757  return (flags & (req | neg)) == req;
758}
759
760// These are for forming case labels:
761#define ID3(x, y, z) (( jlong)(z) +                                  \
762                      ((jlong)(y) <<    vmSymbols::log2_SID_LIMIT) + \
763                      ((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT))  )
764#define SID_ENUM(n) vmSymbols::VM_SYMBOL_ENUM_NAME(n)
765
766vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbols::SID holder,
767                                            vmSymbols::SID name,
768                                            vmSymbols::SID sig,
769                                            jshort flags) {
770  assert((int)vmSymbols::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
771
772  // Let the C compiler build the decision tree.
773
774#define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
775  case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \
776    if (!match_##fcode(flags))  break; \
777    return id;
778
779  switch (ID3(holder, name, sig)) {
780    VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
781                     VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
782  }
783  return vmIntrinsics::_none;
784
785#undef VM_INTRINSIC_CASE
786}
787
788
789const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) {
790  const char* str = name_at(id);
791#ifndef PRODUCT
792  const char* kname = vmSymbols::name_for(class_for(id));
793  const char* mname = vmSymbols::name_for(name_for(id));
794  const char* sname = vmSymbols::name_for(signature_for(id));
795  const char* fname = "";
796  switch (flags_for(id)) {
797  case F_Y:  fname = "synchronized ";  break;
798  case F_RN: fname = "native ";        break;
799  case F_SN: fname = "native static "; break;
800  case F_S:  fname = "static ";        break;
801  case F_RNY:fname = "native synchronized "; break;
802  }
803  const char* kptr = strrchr(kname, '/');
804  if (kptr != NULL)  kname = kptr + 1;
805  int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s",
806                         str, fname, kname, mname, sname);
807  if (len < buflen)
808    str = buf;
809#endif //PRODUCT
810  return str;
811}
812
813
814// These are to get information about intrinsics.
815
816#define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f))
817
818static const jlong intrinsic_info_array[vmIntrinsics::ID_LIMIT+1] = {
819#define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \
820  ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode),
821
822  0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO,
823                     VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE)
824    0
825#undef VM_INTRINSIC_INFO
826};
827
828inline jlong intrinsic_info(vmIntrinsics::ID id) {
829  return intrinsic_info_array[vmIntrinsics::ID_from((int)id)];
830}
831
832vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) {
833  jlong info = intrinsic_info(id);
834  int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
835  assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1021, "");
836  return vmSymbols::SID( (info >> shift) & mask );
837}
838
839vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) {
840  jlong info = intrinsic_info(id);
841  int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
842  assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1022, "");
843  return vmSymbols::SID( (info >> shift) & mask );
844}
845
846vmSymbols::SID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
847  jlong info = intrinsic_info(id);
848  int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
849  assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1023, "");
850  return vmSymbols::SID( (info >> shift) & mask );
851}
852
853vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
854  jlong info = intrinsic_info(id);
855  int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT);
856  assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 15, "");
857  return Flags( (info >> shift) & mask );
858}
859
860
861#ifndef PRODUCT
862// verify_method performs an extra check on a matched intrinsic method
863
864static bool match_method(Method* m, Symbol* n, Symbol* s) {
865  return (m->name() == n &&
866          m->signature() == s);
867}
868
869static vmIntrinsics::ID match_method_with_klass(Method* m, Symbol* mk) {
870#define VM_INTRINSIC_MATCH(id, klassname, namepart, sigpart, flags) \
871  { Symbol* k = vmSymbols::klassname(); \
872    if (mk == k) { \
873      Symbol* n = vmSymbols::namepart(); \
874      Symbol* s = vmSymbols::sigpart(); \
875      if (match_method(m, n, s)) \
876        return vmIntrinsics::id; \
877    } }
878  VM_INTRINSICS_DO(VM_INTRINSIC_MATCH,
879                   VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
880  return vmIntrinsics::_none;
881#undef VM_INTRINSIC_MATCH
882}
883
884void vmIntrinsics::verify_method(ID actual_id, Method* m) {
885  Symbol* mk = m->method_holder()->name();
886  ID declared_id = match_method_with_klass(m, mk);
887
888  if (declared_id == actual_id)  return; // success
889
890  if (declared_id == _none && actual_id != _none && mk == vmSymbols::java_lang_StrictMath()) {
891    // Here are a few special cases in StrictMath not declared in vmSymbols.hpp.
892    switch (actual_id) {
893    case _min:
894    case _max:
895    case _dsqrt:
896      declared_id = match_method_with_klass(m, vmSymbols::java_lang_Math());
897      if (declared_id == actual_id)  return; // acceptable alias
898      break;
899    }
900  }
901
902  const char* declared_name = name_at(declared_id);
903  const char* actual_name   = name_at(actual_id);
904  methodHandle mh = m;
905  m = NULL;
906  ttyLocker ttyl;
907  if (xtty != NULL) {
908    xtty->begin_elem("intrinsic_misdeclared actual='%s' declared='%s'",
909                     actual_name, declared_name);
910    xtty->method(mh);
911    xtty->end_elem("%s", "");
912  }
913  if (PrintMiscellaneous && (WizardMode || Verbose)) {
914    tty->print_cr("*** misidentified method; %s(%d) should be %s(%d):",
915                  declared_name, declared_id, actual_name, actual_id);
916    mh()->print_short_name(tty);
917    tty->cr();
918  }
919}
920#endif //PRODUCT
921