1 /*
2 * Copyright (c) 1997, 2017, 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 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
27
28 #include "utilities/compilerWarnings.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 #include COMPILER_HEADER(utilities/globalDefinitions)
33
34 // Defaults for macros that might be defined per compiler.
35 #ifndef NOINLINE
36 #define NOINLINE
37 #endif
38 #ifndef ALWAYSINLINE
39 #define ALWAYSINLINE inline
40 #endif
41
42 // This file holds all globally used constants & types, class (forward)
43 // declarations and a few frequently used utility functions.
44
45 //----------------------------------------------------------------------------------------------------
46 // Printf-style formatters for fixed- and variable-width types as pointers and
47 // integers. These are derived from the definitions in inttypes.h. If the platform
48 // doesn't provide appropriate definitions, they should be provided in
49 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
50
51 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
52
53 // Format 32-bit quantities.
54 #define INT32_FORMAT "%" PRId32
55 #define UINT32_FORMAT "%" PRIu32
56 #define INT32_FORMAT_W(width) "%" #width PRId32
57 #define UINT32_FORMAT_W(width) "%" #width PRIu32
58
59 #define PTR32_FORMAT "0x%08" PRIx32
60 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
61
62 // Format 64-bit quantities.
63 #define INT64_FORMAT "%" PRId64
64 #define UINT64_FORMAT "%" PRIu64
65 #define UINT64_FORMAT_X "%" PRIx64
66 #define INT64_FORMAT_W(width) "%" #width PRId64
67 #define UINT64_FORMAT_W(width) "%" #width PRIu64
68
69 #define PTR64_FORMAT "0x%016" PRIx64
70
71 // Format jlong, if necessary
72 #ifndef JLONG_FORMAT
73 #define JLONG_FORMAT INT64_FORMAT
74 #endif
75 #ifndef JULONG_FORMAT
76 #define JULONG_FORMAT UINT64_FORMAT
77 #endif
78 #ifndef JULONG_FORMAT_X
79 #define JULONG_FORMAT_X UINT64_FORMAT_X
80 #endif
81
82 // Format pointers which change size between 32- and 64-bit.
83 #ifdef _LP64
84 #define INTPTR_FORMAT "0x%016" PRIxPTR
85 #define PTR_FORMAT "0x%016" PRIxPTR
86 #else // !_LP64
87 #define INTPTR_FORMAT "0x%08" PRIxPTR
88 #define PTR_FORMAT "0x%08" PRIxPTR
89 #endif // _LP64
90
91 // Format pointers without leading zeros
92 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
93
94 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
95
96 #define SSIZE_FORMAT "%" PRIdPTR
97 #define SIZE_FORMAT "%" PRIuPTR
98 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
99 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
100 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
101 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
102
103 #define INTX_FORMAT "%" PRIdPTR
104 #define UINTX_FORMAT "%" PRIuPTR
105 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
106 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
107
108 //----------------------------------------------------------------------------------------------------
109 // Constants
110
111 const int LogBytesPerShort = 1;
112 const int LogBytesPerInt = 2;
113 #ifdef _LP64
114 const int LogBytesPerWord = 3;
115 #else
116 const int LogBytesPerWord = 2;
117 #endif
118 const int LogBytesPerLong = 3;
119
120 const int BytesPerShort = 1 << LogBytesPerShort;
121 const int BytesPerInt = 1 << LogBytesPerInt;
122 const int BytesPerWord = 1 << LogBytesPerWord;
123 const int BytesPerLong = 1 << LogBytesPerLong;
124
125 const int LogBitsPerByte = 3;
126 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
127 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
128 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
129 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
130
131 const int BitsPerByte = 1 << LogBitsPerByte;
132 const int BitsPerShort = 1 << LogBitsPerShort;
133 const int BitsPerInt = 1 << LogBitsPerInt;
134 const int BitsPerWord = 1 << LogBitsPerWord;
135 const int BitsPerLong = 1 << LogBitsPerLong;
136
137 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
138 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
139
140 const int WordsPerLong = 2; // Number of stack entries for longs
141
142 const int oopSize = sizeof(char*); // Full-width oop
143 extern int heapOopSize; // Oop within a java object
144 const int wordSize = sizeof(char*);
145 const int longSize = sizeof(jlong);
146 const int jintSize = sizeof(jint);
147 const int size_tSize = sizeof(size_t);
148
149 const int BytesPerOop = BytesPerWord; // Full-width oop
150
151 extern int LogBytesPerHeapOop; // Oop within a java object
152 extern int LogBitsPerHeapOop;
153 extern int BytesPerHeapOop;
154 extern int BitsPerHeapOop;
155
156 const int BitsPerJavaInteger = 32;
157 const int BitsPerJavaLong = 64;
158 const int BitsPerSize_t = size_tSize * BitsPerByte;
159
160 // Size of a char[] needed to represent a jint as a string in decimal.
161 const int jintAsStringSize = 12;
162
163 // In fact this should be
164 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
165 // see os::set_memory_serialize_page()
166 #ifdef _LP64
167 const int SerializePageShiftCount = 4;
168 #else
169 const int SerializePageShiftCount = 3;
170 #endif
171
172 // An opaque struct of heap-word width, so that HeapWord* can be a generic
173 // pointer into the heap. We require that object sizes be measured in
174 // units of heap words, so that that
175 // HeapWord* hw;
176 // hw += oop(hw)->foo();
177 // works, where foo is a method (like size or scavenge) that returns the
178 // object size.
179 class HeapWord {
180 friend class VMStructs;
181 private:
182 char* i;
183 #ifndef PRODUCT
184 public:
185 char* value() { return i; }
186 #endif
187 };
188
189 // Analogous opaque struct for metadata allocated from
190 // metaspaces.
191 class MetaWord {
192 private:
193 char* i;
194 };
195
196 // HeapWordSize must be 2^LogHeapWordSize.
197 const int HeapWordSize = sizeof(HeapWord);
198 #ifdef _LP64
199 const int LogHeapWordSize = 3;
200 #else
201 const int LogHeapWordSize = 2;
202 #endif
203 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
204 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
205
206 // The minimum number of native machine words necessary to contain "byte_size"
207 // bytes.
208 inline size_t heap_word_size(size_t byte_size) {
209 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
210 }
211
212 //-------------------------------------------
213 // Constant for jlong (standardized by C++11)
214
215 // Build a 64bit integer constant
216 #define CONST64(x) (x ## LL)
217 #define UCONST64(x) (x ## ULL)
218
219 const jlong min_jlong = CONST64(0x8000000000000000);
220 const jlong max_jlong = CONST64(0x7fffffffffffffff);
221
222 const size_t K = 1024;
223 const size_t M = K*K;
224 const size_t G = M*K;
225 const size_t HWperKB = K / sizeof(HeapWord);
226
227 // Constants for converting from a base unit to milli-base units. For
228 // example from seconds to milliseconds and microseconds
229
230 const int MILLIUNITS = 1000; // milli units per base unit
231 const int MICROUNITS = 1000000; // micro units per base unit
232 const int NANOUNITS = 1000000000; // nano units per base unit
233
234 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
235 const jint NANOSECS_PER_MILLISEC = 1000000;
236
237 inline const char* proper_unit_for_byte_size(size_t s) {
238 #ifdef _LP64
239 if (s >= 10*G) {
240 return "G";
241 }
242 #endif
243 if (s >= 10*M) {
244 return "M";
245 } else if (s >= 10*K) {
246 return "K";
247 } else {
248 return "B";
249 }
250 }
251
252 template <class T>
253 inline T byte_size_in_proper_unit(T s) {
254 #ifdef _LP64
255 if (s >= 10*G) {
256 return (T)(s/G);
257 }
258 #endif
259 if (s >= 10*M) {
260 return (T)(s/M);
261 } else if (s >= 10*K) {
262 return (T)(s/K);
263 } else {
264 return s;
265 }
266 }
267
268 inline const char* exact_unit_for_byte_size(size_t s) {
269 #ifdef _LP64
270 if (s >= G && (s % G) == 0) {
271 return "G";
272 }
273 #endif
274 if (s >= M && (s % M) == 0) {
275 return "M";
276 }
277 if (s >= K && (s % K) == 0) {
278 return "K";
279 }
280 return "B";
281 }
282
283 inline size_t byte_size_in_exact_unit(size_t s) {
284 #ifdef _LP64
285 if (s >= G && (s % G) == 0) {
286 return s / G;
287 }
288 #endif
289 if (s >= M && (s % M) == 0) {
290 return s / M;
291 }
292 if (s >= K && (s % K) == 0) {
293 return s / K;
294 }
295 return s;
296 }
297
298 //----------------------------------------------------------------------------------------------------
299 // VM type definitions
300
301 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
302 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
303
304 typedef intptr_t intx;
305 typedef uintptr_t uintx;
306
307 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
308 const intx max_intx = (uintx)min_intx - 1;
309 const uintx max_uintx = (uintx)-1;
310
311 // Table of values:
312 // sizeof intx 4 8
313 // min_intx 0x80000000 0x8000000000000000
314 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
315 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
316
317 typedef unsigned int uint; NEEDS_CLEANUP
318
319
320 //----------------------------------------------------------------------------------------------------
321 // Java type definitions
322
323 // All kinds of 'plain' byte addresses
324 typedef signed char s_char;
325 typedef unsigned char u_char;
326 typedef u_char* address;
327 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
328 // except for some implementations of a C++
329 // linkage pointer to function. Should never
330 // need one of those to be placed in this
331 // type anyway.
332
333 // Utility functions to "portably" (?) bit twiddle pointers
334 // Where portable means keep ANSI C++ compilers quiet
335
336 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
337 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
338
339 // Utility functions to "portably" make cast to/from function pointers.
340
341 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
342 inline address_word castable_address(address x) { return address_word(x) ; }
343 inline address_word castable_address(void* x) { return address_word(x) ; }
344
345 // Pointer subtraction.
346 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
347 // the range we might need to find differences from one end of the heap
348 // to the other.
349 // A typical use might be:
350 // if (pointer_delta(end(), top()) >= size) {
351 // // enough room for an object of size
352 // ...
353 // and then additions like
354 // ... top() + size ...
355 // are safe because we know that top() is at least size below end().
356 inline size_t pointer_delta(const volatile void* left,
357 const volatile void* right,
358 size_t element_size) {
359 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
360 }
361
362 // A version specialized for HeapWord*'s.
363 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
364 return pointer_delta(left, right, sizeof(HeapWord));
365 }
366 // A version specialized for MetaWord*'s.
367 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
368 return pointer_delta(left, right, sizeof(MetaWord));
369 }
370
371 //
372 // ANSI C++ does not allow casting from one pointer type to a function pointer
373 // directly without at best a warning. This macro accomplishes it silently
374 // In every case that is present at this point the value be cast is a pointer
375 // to a C linkage function. In some case the type used for the cast reflects
376 // that linkage and a picky compiler would not complain. In other cases because
377 // there is no convenient place to place a typedef with extern C linkage (i.e
378 // a platform dependent header file) it doesn't. At this point no compiler seems
379 // picky enough to catch these instances (which are few). It is possible that
380 // using templates could fix these for all cases. This use of templates is likely
381 // so far from the middle of the road that it is likely to be problematic in
382 // many C++ compilers.
383 //
384 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
385 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
386
387 // Unsigned byte types for os and stream.hpp
388
389 // Unsigned one, two, four and eigth byte quantities used for describing
390 // the .class file format. See JVM book chapter 4.
391
392 typedef jubyte u1;
393 typedef jushort u2;
394 typedef juint u4;
395 typedef julong u8;
396
397 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
398 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
399 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
400 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
401
402 typedef jbyte s1;
403 typedef jshort s2;
404 typedef jint s4;
405 typedef jlong s8;
406
407 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
408 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
409 const jshort min_jshort = -(1 << 15); // smallest jshort
410 const jshort max_jshort = (1 << 15) - 1; // largest jshort
411
412 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
413 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
414
415 //----------------------------------------------------------------------------------------------------
416 // JVM spec restrictions
417
418 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
419
420 //----------------------------------------------------------------------------------------------------
421 // Default and minimum StringTableSize values
422
423 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013);
424 const int minimumStringTableSize = 1009;
425
426 const int defaultSymbolTableSize = 20011;
427 const int minimumSymbolTableSize = 1009;
428
429
430 //----------------------------------------------------------------------------------------------------
431 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
432 //
433 // Determines whether on-the-fly class replacement and frame popping are enabled.
434
435 #define HOTSWAP
436
437 //----------------------------------------------------------------------------------------------------
438 // Object alignment, in units of HeapWords.
439 //
440 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
441 // reference fields can be naturally aligned.
442
443 extern int MinObjAlignment;
444 extern int MinObjAlignmentInBytes;
445 extern int MinObjAlignmentInBytesMask;
446
447 extern int LogMinObjAlignment;
448 extern int LogMinObjAlignmentInBytes;
449
450 const int LogKlassAlignmentInBytes = 3;
451 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
452 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
453 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
454
455 // Maximal size of heap where unscaled compression can be used. Also upper bound
456 // for heap placement: 4GB.
457 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
458 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
459 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
460 extern uint64_t OopEncodingHeapMax;
461
462 // Maximal size of compressed class space. Above this limit compression is not possible.
463 // Also upper bound for placement of zero based class space. (Class space is further limited
464 // to be < 3G, see arguments.cpp.)
465 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
466
467 // Machine dependent stuff
468
469 // The maximum size of the code cache. Can be overridden by targets.
470 #define CODE_CACHE_SIZE_LIMIT (2*G)
471 // Allow targets to reduce the default size of the code cache.
472 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
473
474 #include CPU_HEADER(globalDefinitions)
475
476 // To assure the IRIW property on processors that are not multiple copy
477 // atomic, sync instructions must be issued between volatile reads to
478 // assure their ordering, instead of after volatile stores.
479 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
480 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
481 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
482 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
483 #else
484 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
485 #endif
486
487 // The expected size in bytes of a cache line, used to pad data structures.
488 #ifndef DEFAULT_CACHE_LINE_SIZE
489 #define DEFAULT_CACHE_LINE_SIZE 64
490 #endif
491
492
493 //----------------------------------------------------------------------------------------------------
494 // Utility macros for compilers
495 // used to silence compiler warnings
496
497 #define Unused_Variable(var) var
498
499
500 //----------------------------------------------------------------------------------------------------
501 // Miscellaneous
502
503 // 6302670 Eliminate Hotspot __fabsf dependency
504 // All fabs() callers should call this function instead, which will implicitly
505 // convert the operand to double, avoiding a dependency on __fabsf which
506 // doesn't exist in early versions of Solaris 8.
507 inline double fabsd(double value) {
508 return fabs(value);
509 }
510
511 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
512 // is zero, return 0.0.
513 template<typename T>
514 inline double percent_of(T numerator, T denominator) {
515 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
516 }
517
518 //----------------------------------------------------------------------------------------------------
519 // Special casts
520 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
521 typedef union {
522 jfloat f;
523 jint i;
524 } FloatIntConv;
525
526 typedef union {
527 jdouble d;
528 jlong l;
529 julong ul;
530 } DoubleLongConv;
531
532 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
533 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
534
535 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
536 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
537 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
538
539 inline jint low (jlong value) { return jint(value); }
540 inline jint high(jlong value) { return jint(value >> 32); }
541
542 // the fancy casts are a hopefully portable way
543 // to do unsigned 32 to 64 bit type conversion
544 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
545 *value |= (jlong)(julong)(juint)low; }
546
547 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
548 *value |= (jlong)high << 32; }
549
550 inline jlong jlong_from(jint h, jint l) {
551 jlong result = 0; // initialization to avoid warning
552 set_high(&result, h);
553 set_low(&result, l);
554 return result;
555 }
556
557 union jlong_accessor {
558 jint words[2];
559 jlong long_value;
560 };
561
562 void basic_types_init(); // cannot define here; uses assert
563
564
565 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
566 enum BasicType {
567 T_BOOLEAN = 4,
568 T_CHAR = 5,
569 T_FLOAT = 6,
570 T_DOUBLE = 7,
571 T_BYTE = 8,
572 T_SHORT = 9,
573 T_INT = 10,
574 T_LONG = 11,
575 T_OBJECT = 12,
576 T_ARRAY = 13,
577 T_VOID = 14,
578 T_ADDRESS = 15,
579 T_NARROWOOP = 16,
580 T_METADATA = 17,
581 T_NARROWKLASS = 18,
582 T_CONFLICT = 19, // for stack value type with conflicting contents
583 T_ILLEGAL = 99
584 };
585
586 inline bool is_java_primitive(BasicType t) {
587 return T_BOOLEAN <= t && t <= T_LONG;
588 }
589
590 inline bool is_subword_type(BasicType t) {
591 // these guys are processed exactly like T_INT in calling sequences:
592 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
593 }
594
595 inline bool is_signed_subword_type(BasicType t) {
596 return (t == T_BYTE || t == T_SHORT);
597 }
598
599 // Convert a char from a classfile signature to a BasicType
600 inline BasicType char2type(char c) {
601 switch( c ) {
602 case 'B': return T_BYTE;
603 case 'C': return T_CHAR;
604 case 'D': return T_DOUBLE;
605 case 'F': return T_FLOAT;
606 case 'I': return T_INT;
607 case 'J': return T_LONG;
608 case 'S': return T_SHORT;
609 case 'Z': return T_BOOLEAN;
610 case 'V': return T_VOID;
611 case 'L': return T_OBJECT;
612 case '[': return T_ARRAY;
613 }
614 return T_ILLEGAL;
615 }
616
617 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
618 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
619 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
620 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
621 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
622 extern BasicType name2type(const char* name);
623
624 // Auxiliary math routines
625 // least common multiple
626 extern size_t lcm(size_t a, size_t b);
627
628
629 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
630 enum BasicTypeSize {
631 T_BOOLEAN_size = 1,
632 T_CHAR_size = 1,
633 T_FLOAT_size = 1,
634 T_DOUBLE_size = 2,
635 T_BYTE_size = 1,
636 T_SHORT_size = 1,
637 T_INT_size = 1,
638 T_LONG_size = 2,
639 T_OBJECT_size = 1,
640 T_ARRAY_size = 1,
641 T_NARROWOOP_size = 1,
642 T_NARROWKLASS_size = 1,
643 T_VOID_size = 0
644 };
645
646
647 // maps a BasicType to its instance field storage type:
648 // all sub-word integral types are widened to T_INT
649 extern BasicType type2field[T_CONFLICT+1];
650 extern BasicType type2wfield[T_CONFLICT+1];
651
652
653 // size in bytes
654 enum ArrayElementSize {
655 T_BOOLEAN_aelem_bytes = 1,
656 T_CHAR_aelem_bytes = 2,
657 T_FLOAT_aelem_bytes = 4,
658 T_DOUBLE_aelem_bytes = 8,
659 T_BYTE_aelem_bytes = 1,
660 T_SHORT_aelem_bytes = 2,
661 T_INT_aelem_bytes = 4,
662 T_LONG_aelem_bytes = 8,
663 #ifdef _LP64
664 T_OBJECT_aelem_bytes = 8,
665 T_ARRAY_aelem_bytes = 8,
666 #else
667 T_OBJECT_aelem_bytes = 4,
668 T_ARRAY_aelem_bytes = 4,
669 #endif
670 T_NARROWOOP_aelem_bytes = 4,
671 T_NARROWKLASS_aelem_bytes = 4,
672 T_VOID_aelem_bytes = 0
673 };
674
675 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
676 #ifdef ASSERT
677 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
678 #else
679 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
680 #endif
681
682
683 // JavaValue serves as a container for arbitrary Java values.
684
685 class JavaValue {
686
687 public:
688 typedef union JavaCallValue {
689 jfloat f;
690 jdouble d;
691 jint i;
692 jlong l;
693 jobject h;
694 } JavaCallValue;
695
696 private:
697 BasicType _type;
698 JavaCallValue _value;
699
700 public:
701 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
702
703 JavaValue(jfloat value) {
704 _type = T_FLOAT;
705 _value.f = value;
706 }
707
708 JavaValue(jdouble value) {
709 _type = T_DOUBLE;
710 _value.d = value;
711 }
712
713 jfloat get_jfloat() const { return _value.f; }
714 jdouble get_jdouble() const { return _value.d; }
715 jint get_jint() const { return _value.i; }
716 jlong get_jlong() const { return _value.l; }
717 jobject get_jobject() const { return _value.h; }
718 JavaCallValue* get_value_addr() { return &_value; }
719 BasicType get_type() const { return _type; }
720
721 void set_jfloat(jfloat f) { _value.f = f;}
722 void set_jdouble(jdouble d) { _value.d = d;}
723 void set_jint(jint i) { _value.i = i;}
724 void set_jlong(jlong l) { _value.l = l;}
725 void set_jobject(jobject h) { _value.h = h;}
726 void set_type(BasicType t) { _type = t; }
727
728 jboolean get_jboolean() const { return (jboolean) (_value.i);}
729 jbyte get_jbyte() const { return (jbyte) (_value.i);}
730 jchar get_jchar() const { return (jchar) (_value.i);}
731 jshort get_jshort() const { return (jshort) (_value.i);}
732
733 };
734
735
736 #define STACK_BIAS 0
737 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
738 // in order to extend the reach of the stack pointer.
739 #if defined(SPARC) && defined(_LP64)
740 #undef STACK_BIAS
741 #define STACK_BIAS 0x7ff
742 #endif
743
744
745 // TosState describes the top-of-stack state before and after the execution of
746 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
747 // registers. The TosState corresponds to the 'machine representation' of this cached
748 // value. There's 4 states corresponding to the JAVA types int, long, float & double
749 // as well as a 5th state in case the top-of-stack value is actually on the top
750 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
751 // state when it comes to machine representation but is used separately for (oop)
752 // type specific operations (e.g. verification code).
753
754 enum TosState { // describes the tos cache contents
755 btos = 0, // byte, bool tos cached
756 ztos = 1, // byte, bool tos cached
757 ctos = 2, // char tos cached
758 stos = 3, // short tos cached
759 itos = 4, // int tos cached
760 ltos = 5, // long tos cached
761 ftos = 6, // float tos cached
762 dtos = 7, // double tos cached
763 atos = 8, // object cached
764 vtos = 9, // tos not cached
765 number_of_states,
766 ilgl // illegal state: should not occur
767 };
768
769
770 inline TosState as_TosState(BasicType type) {
771 switch (type) {
772 case T_BYTE : return btos;
773 case T_BOOLEAN: return ztos;
774 case T_CHAR : return ctos;
775 case T_SHORT : return stos;
776 case T_INT : return itos;
777 case T_LONG : return ltos;
778 case T_FLOAT : return ftos;
779 case T_DOUBLE : return dtos;
780 case T_VOID : return vtos;
781 case T_ARRAY : // fall through
782 case T_OBJECT : return atos;
783 default : return ilgl;
784 }
785 }
786
787 inline BasicType as_BasicType(TosState state) {
788 switch (state) {
789 case btos : return T_BYTE;
790 case ztos : return T_BOOLEAN;
791 case ctos : return T_CHAR;
792 case stos : return T_SHORT;
793 case itos : return T_INT;
794 case ltos : return T_LONG;
795 case ftos : return T_FLOAT;
796 case dtos : return T_DOUBLE;
797 case atos : return T_OBJECT;
798 case vtos : return T_VOID;
799 default : return T_ILLEGAL;
800 }
801 }
802
803
804 // Helper function to convert BasicType info into TosState
805 // Note: Cannot define here as it uses global constant at the time being.
806 TosState as_TosState(BasicType type);
807
808
809 // JavaThreadState keeps track of which part of the code a thread is executing in. This
810 // information is needed by the safepoint code.
811 //
812 // There are 4 essential states:
813 //
814 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
815 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
816 // _thread_in_vm : Executing in the vm
817 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
818 //
819 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
820 // a transition from one state to another. These extra states makes it possible for the safepoint code to
821 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
822 //
823 // Given a state, the xxxx_trans state can always be found by adding 1.
824 //
825 enum JavaThreadState {
826 _thread_uninitialized = 0, // should never happen (missing initialization)
827 _thread_new = 2, // just starting up, i.e., in process of being initialized
828 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
829 _thread_in_native = 4, // running in native code
830 _thread_in_native_trans = 5, // corresponding transition state
831 _thread_in_vm = 6, // running in VM
832 _thread_in_vm_trans = 7, // corresponding transition state
833 _thread_in_Java = 8, // running in Java or in stub code
834 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
835 _thread_blocked = 10, // blocked in vm
836 _thread_blocked_trans = 11, // corresponding transition state
837 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
838 };
839
840
841
842 //----------------------------------------------------------------------------------------------------
843 // 'Forward' declarations of frequently used classes
844 // (in order to reduce interface dependencies & reduce
845 // number of unnecessary compilations after changes)
846
847 class ClassFileStream;
848
849 class Event;
850
851 class Thread;
852 class VMThread;
853 class JavaThread;
854 class Threads;
855
856 class VM_Operation;
857 class VMOperationQueue;
858
859 class CodeBlob;
860 class CompiledMethod;
861 class nmethod;
862 class RuntimeBlob;
863 class OSRAdapter;
864 class I2CAdapter;
865 class C2IAdapter;
866 class CompiledIC;
867 class relocInfo;
868 class ScopeDesc;
869 class PcDesc;
870
871 class Recompiler;
872 class Recompilee;
873 class RecompilationPolicy;
874 class RFrame;
875 class CompiledRFrame;
876 class InterpretedRFrame;
877
878 class vframe;
879 class javaVFrame;
880 class interpretedVFrame;
881 class compiledVFrame;
882 class deoptimizedVFrame;
883 class externalVFrame;
884 class entryVFrame;
885
886 class RegisterMap;
887
888 class Mutex;
889 class Monitor;
890 class BasicLock;
891 class BasicObjectLock;
892
893 class PeriodicTask;
894
895 class JavaCallWrapper;
896
897 class oopDesc;
898 class metaDataOopDesc;
899
900 class NativeCall;
901
902 class zone;
903
904 class StubQueue;
905
906 class outputStream;
907
908 class ResourceArea;
909
910 class DebugInformationRecorder;
911 class ScopeValue;
912 class CompressedStream;
913 class DebugInfoReadStream;
914 class DebugInfoWriteStream;
915 class LocationValue;
916 class ConstantValue;
917 class IllegalValue;
918
919 class PrivilegedElement;
920 class MonitorArray;
921
922 class MonitorInfo;
923
924 class OffsetClosure;
925 class OopMapCache;
926 class InterpreterOopMap;
927 class OopMapCacheEntry;
928 class OSThread;
929
930 typedef int (*OSThreadStartFunc)(void*);
931
932 class Space;
933
934 class JavaValue;
935 class methodHandle;
936 class JavaCallArguments;
937
938 // Basic support for errors.
939 extern void basic_fatal(const char* msg);
940
941 //----------------------------------------------------------------------------------------------------
942 // Special constants for debugging
943
944 const jint badInt = -3; // generic "bad int" value
945 const long badAddressVal = -2; // generic "bad address" value
946 const long badOopVal = -1; // generic "bad oop" value
947 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
948 const int badHandleValue = 0xBC; // value used to zap vm handle area
949 const int badResourceValue = 0xAB; // value used to zap resource area
950 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
951 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
952 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
953 const intptr_t badJNIHandleVal = (intptr_t) UCONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area
954 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
955 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
956 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
957 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
958
959
960 // (These must be implemented as #defines because C++ compilers are
961 // not obligated to inline non-integral constants!)
962 #define badAddress ((address)::badAddressVal)
963 #define badOop (cast_to_oop(::badOopVal))
964 #define badHeapWord (::badHeapWordVal)
965 #define badJNIHandle (cast_to_oop(::badJNIHandleVal))
966
967 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
968 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
969
970 //----------------------------------------------------------------------------------------------------
971 // Utility functions for bitfield manipulations
972
973 const intptr_t AllBits = ~0; // all bits set in a word
974 const intptr_t NoBits = 0; // no bits set in a word
975 const jlong NoLongBits = 0; // no bits set in a long
976 const intptr_t OneBit = 1; // only right_most bit set in a word
977
978 // get a word with the n.th or the right-most or left-most n bits set
979 // (note: #define used only so that they can be used in enum constant definitions)
980 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
981 #define right_n_bits(n) (nth_bit(n) - 1)
982 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
983
984 // bit-operations using a mask m
985 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
986 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
987 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
988 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
989 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
990
991 // bit-operations using the n.th bit
992 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
993 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
994 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
995
996 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
997 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
998 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
999 }
1000
1001
1002 //----------------------------------------------------------------------------------------------------
1003 // Utility functions for integers
1004
1005 // Avoid use of global min/max macros which may cause unwanted double
1006 // evaluation of arguments.
1007 #ifdef max
1008 #undef max
1009 #endif
1010
1011 #ifdef min
1012 #undef min
1013 #endif
1014
1015 // The following defines serve the purpose of preventing use of accidentally
1016 // included min max macros from compiling, while continuing to allow innocent
1017 // min and max identifiers in the code to compile as intended.
1018 #define max max
1019 #define min min
1020
1021 // It is necessary to use templates here. Having normal overloaded
1022 // functions does not work because it is necessary to provide both 32-
1023 // and 64-bit overloaded functions, which does not work, and having
1024 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1025 // will be even more error-prone than macros.
1026 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1027 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1028 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1029 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1030 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1031 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1032
1033 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1034
1035 // true if x is a power of 2, false otherwise
1036 inline bool is_power_of_2(intptr_t x) {
1037 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1038 }
1039
1040 // long version of is_power_of_2
1041 inline bool is_power_of_2_long(jlong x) {
1042 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1043 }
1044
1045 // Returns largest i such that 2^i <= x.
1046 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1047 // If x == 0, the function returns -1.
1048 inline int log2_intptr(intptr_t x) {
1049 int i = -1;
1050 uintptr_t p = 1;
1051 while (p != 0 && p <= (uintptr_t)x) {
1052 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1053 i++; p *= 2;
1054 }
1055 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1056 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1057 return i;
1058 }
1059
1060 //* largest i such that 2^i <= x
1061 // A negative value of 'x' will return '63'
1062 inline int log2_long(jlong x) {
1063 int i = -1;
1064 julong p = 1;
1065 while (p != 0 && p <= (julong)x) {
1066 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1067 i++; p *= 2;
1068 }
1069 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1070 // (if p = 0 then overflow occurred and i = 63)
1071 return i;
1072 }
1073
1074 //* the argument must be exactly a power of 2
1075 inline int exact_log2(intptr_t x) {
1076 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1077 return log2_intptr(x);
1078 }
1079
1080 //* the argument must be exactly a power of 2
1081 inline int exact_log2_long(jlong x) {
1082 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1083 return log2_long(x);
1084 }
1085
1086 inline bool is_odd (intx x) { return x & 1; }
1087 inline bool is_even(intx x) { return !is_odd(x); }
1088
1089 // "to" should be greater than "from."
1090 inline intx byte_size(void* from, void* to) {
1091 return (address)to - (address)from;
1092 }
1093
1094 //----------------------------------------------------------------------------------------------------
1095 // Avoid non-portable casts with these routines (DEPRECATED)
1096
1097 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1098 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1099
1100 // Given sequence of four bytes, build into a 32-bit word
1101 // following the conventions used in class files.
1102 // On the 386, this could be realized with a simple address cast.
1103 //
1104
1105 // This routine takes eight bytes:
1106 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1107 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1108 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1109 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1110 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1111 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1112 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1113 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1114 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1115 }
1116
1117 // This routine takes four bytes:
1118 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1119 return (( u4(c1) << 24 ) & 0xff000000)
1120 | (( u4(c2) << 16 ) & 0x00ff0000)
1121 | (( u4(c3) << 8 ) & 0x0000ff00)
1122 | (( u4(c4) << 0 ) & 0x000000ff);
1123 }
1124
1125 // And this one works if the four bytes are contiguous in memory:
1126 inline u4 build_u4_from( u1* p ) {
1127 return build_u4_from( p[0], p[1], p[2], p[3] );
1128 }
1129
1130 // Ditto for two-byte ints:
1131 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1132 return u2((( u2(c1) << 8 ) & 0xff00)
1133 | (( u2(c2) << 0 ) & 0x00ff));
1134 }
1135
1136 // And this one works if the two bytes are contiguous in memory:
1137 inline u2 build_u2_from( u1* p ) {
1138 return build_u2_from( p[0], p[1] );
1139 }
1140
1141 // Ditto for floats:
1142 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1143 u4 u = build_u4_from( c1, c2, c3, c4 );
1144 return *(jfloat*)&u;
1145 }
1146
1147 inline jfloat build_float_from( u1* p ) {
1148 u4 u = build_u4_from( p );
1149 return *(jfloat*)&u;
1150 }
1151
1152
1153 // now (64-bit) longs
1154
1155 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1156 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1157 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1158 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1159 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1160 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1161 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1162 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1163 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1164 }
1165
1166 inline jlong build_long_from( u1* p ) {
1167 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1168 }
1169
1170
1171 // Doubles, too!
1172 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1173 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1174 return *(jdouble*)&u;
1175 }
1176
1177 inline jdouble build_double_from( u1* p ) {
1178 jlong u = build_long_from( p );
1179 return *(jdouble*)&u;
1180 }
1181
1182
1183 // Portable routines to go the other way:
1184
1185 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1186 c1 = u1(x >> 8);
1187 c2 = u1(x);
1188 }
1189
1190 inline void explode_short_to( u2 x, u1* p ) {
1191 explode_short_to( x, p[0], p[1]);
1192 }
1193
1194 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1195 c1 = u1(x >> 24);
1196 c2 = u1(x >> 16);
1197 c3 = u1(x >> 8);
1198 c4 = u1(x);
1199 }
1200
1201 inline void explode_int_to( u4 x, u1* p ) {
1202 explode_int_to( x, p[0], p[1], p[2], p[3]);
1203 }
1204
1205
1206 // Pack and extract shorts to/from ints:
1207
1208 inline int extract_low_short_from_int(jint x) {
1209 return x & 0xffff;
1210 }
1211
1212 inline int extract_high_short_from_int(jint x) {
1213 return (x >> 16) & 0xffff;
1214 }
1215
1216 inline int build_int_from_shorts( jushort low, jushort high ) {
1217 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1218 }
1219
1220 // Convert pointer to intptr_t, for use in printing pointers.
1221 inline intptr_t p2i(const void * p) {
1222 return (intptr_t) p;
1223 }
1224
1225 // swap a & b
1226 template<class T> static void swap(T& a, T& b) {
1227 T tmp = a;
1228 a = b;
1229 b = tmp;
1230 }
1231
1232 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1233
1234 //----------------------------------------------------------------------------------------------------
1235 // Sum and product which can never overflow: they wrap, just like the
1236 // Java operations. Note that we don't intend these to be used for
1237 // general-purpose arithmetic: their purpose is to emulate Java
1238 // operations.
1239
1240 // The goal of this code to avoid undefined or implementation-defined
1241 // behavior. The use of an lvalue to reference cast is explicitly
1242 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1243 // 15 in C++03]
1244 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1245 inline TYPE NAME (TYPE in1, TYPE in2) { \
1246 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1247 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1248 return reinterpret_cast<TYPE&>(ures); \
1249 }
1250
1251 JAVA_INTEGER_OP(+, java_add, jint, juint)
1252 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1253 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1254 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1255 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1256 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1257
1258 #undef JAVA_INTEGER_OP
1259
1260 // Dereference vptr
1261 // All C++ compilers that we know of have the vtbl pointer in the first
1262 // word. If there are exceptions, this function needs to be made compiler
1263 // specific.
1264 static inline void* dereference_vptr(const void* addr) {
1265 return *(void**)addr;
1266 }
1267
1268 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP