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 // Default ProtectionDomainCacheSize values
421
422 const int defaultProtectionDomainCacheSize = NOT_LP64(137) LP64_ONLY(2017);
423
424 //----------------------------------------------------------------------------------------------------
425 // Default and minimum StringTableSize values
426
427 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013);
428 const int minimumStringTableSize = 1009;
429
430 const int defaultSymbolTableSize = 20011;
431 const int minimumSymbolTableSize = 1009;
432
433
434 //----------------------------------------------------------------------------------------------------
435 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
436 //
437 // Determines whether on-the-fly class replacement and frame popping are enabled.
438
439 #define HOTSWAP
440
441 //----------------------------------------------------------------------------------------------------
442 // Object alignment, in units of HeapWords.
443 //
444 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
445 // reference fields can be naturally aligned.
446
447 extern int MinObjAlignment;
448 extern int MinObjAlignmentMask;
449 extern int MinObjAlignmentInBytes;
450 extern int MinObjAlignmentInBytesMask;
451
452 extern int LogMinObjAlignment;
453 extern int LogMinObjAlignmentInBytes;
454
455 const int LogKlassAlignmentInBytes = 3;
456 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
457 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
458 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
459
460 // Maximal size of heap where unscaled compression can be used. Also upper bound
461 // for heap placement: 4GB.
462 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
463 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
464 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
465 extern uint64_t OopEncodingHeapMax;
466
467 // Maximal size of compressed class space. Above this limit compression is not possible.
468 // Also upper bound for placement of zero based class space. (Class space is further limited
469 // to be < 3G, see arguments.cpp.)
470 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
471
472 // Machine dependent stuff
473
474 // The maximum size of the code cache. Can be overridden by targets.
475 #define CODE_CACHE_SIZE_LIMIT (2*G)
476 // Allow targets to reduce the default size of the code cache.
477 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
478
479 #include CPU_HEADER(globalDefinitions)
480
481 // To assure the IRIW property on processors that are not multiple copy
482 // atomic, sync instructions must be issued between volatile reads to
483 // assure their ordering, instead of after volatile stores.
484 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
485 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
486 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
487 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
488 #else
489 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
490 #endif
491
492 // The expected size in bytes of a cache line, used to pad data structures.
493 #ifndef DEFAULT_CACHE_LINE_SIZE
494 #define DEFAULT_CACHE_LINE_SIZE 64
495 #endif
496
497
498 //----------------------------------------------------------------------------------------------------
499 // Utility macros for compilers
500 // used to silence compiler warnings
501
502 #define Unused_Variable(var) var
503
504
505 //----------------------------------------------------------------------------------------------------
506 // Miscellaneous
507
508 // 6302670 Eliminate Hotspot __fabsf dependency
509 // All fabs() callers should call this function instead, which will implicitly
510 // convert the operand to double, avoiding a dependency on __fabsf which
511 // doesn't exist in early versions of Solaris 8.
512 inline double fabsd(double value) {
513 return fabs(value);
514 }
515
516 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
517 // is zero, return 0.0.
518 template<typename T>
519 inline double percent_of(T numerator, T denominator) {
520 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
521 }
522
523 //----------------------------------------------------------------------------------------------------
524 // Special casts
525 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
526 typedef union {
527 jfloat f;
528 jint i;
529 } FloatIntConv;
530
531 typedef union {
532 jdouble d;
533 jlong l;
534 julong ul;
535 } DoubleLongConv;
536
537 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
538 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
539
540 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
541 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
542 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
543
544 inline jint low (jlong value) { return jint(value); }
545 inline jint high(jlong value) { return jint(value >> 32); }
546
547 // the fancy casts are a hopefully portable way
548 // to do unsigned 32 to 64 bit type conversion
549 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
550 *value |= (jlong)(julong)(juint)low; }
551
552 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
553 *value |= (jlong)high << 32; }
554
555 inline jlong jlong_from(jint h, jint l) {
556 jlong result = 0; // initialization to avoid warning
557 set_high(&result, h);
558 set_low(&result, l);
559 return result;
560 }
561
562 union jlong_accessor {
563 jint words[2];
564 jlong long_value;
565 };
566
567 void basic_types_init(); // cannot define here; uses assert
568
569
570 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
571 enum BasicType {
572 T_BOOLEAN = 4,
573 T_CHAR = 5,
574 T_FLOAT = 6,
575 T_DOUBLE = 7,
576 T_BYTE = 8,
577 T_SHORT = 9,
578 T_INT = 10,
579 T_LONG = 11,
580 T_OBJECT = 12,
581 T_ARRAY = 13,
582 T_VOID = 14,
583 T_ADDRESS = 15,
584 T_NARROWOOP = 16,
585 T_METADATA = 17,
586 T_NARROWKLASS = 18,
587 T_CONFLICT = 19, // for stack value type with conflicting contents
588 T_ILLEGAL = 99
589 };
590
591 inline bool is_java_primitive(BasicType t) {
592 return T_BOOLEAN <= t && t <= T_LONG;
593 }
594
595 inline bool is_subword_type(BasicType t) {
596 // these guys are processed exactly like T_INT in calling sequences:
597 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
598 }
599
600 inline bool is_signed_subword_type(BasicType t) {
601 return (t == T_BYTE || t == T_SHORT);
602 }
603
604 // Convert a char from a classfile signature to a BasicType
605 inline BasicType char2type(char c) {
606 switch( c ) {
607 case 'B': return T_BYTE;
608 case 'C': return T_CHAR;
609 case 'D': return T_DOUBLE;
610 case 'F': return T_FLOAT;
611 case 'I': return T_INT;
612 case 'J': return T_LONG;
613 case 'S': return T_SHORT;
614 case 'Z': return T_BOOLEAN;
615 case 'V': return T_VOID;
616 case 'L': return T_OBJECT;
617 case '[': return T_ARRAY;
618 }
619 return T_ILLEGAL;
620 }
621
622 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
623 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
624 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
625 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
626 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
627 extern BasicType name2type(const char* name);
628
629 // Auxiliary math routines
630 // least common multiple
631 extern size_t lcm(size_t a, size_t b);
632
633
634 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
635 enum BasicTypeSize {
636 T_BOOLEAN_size = 1,
637 T_CHAR_size = 1,
638 T_FLOAT_size = 1,
639 T_DOUBLE_size = 2,
640 T_BYTE_size = 1,
641 T_SHORT_size = 1,
642 T_INT_size = 1,
643 T_LONG_size = 2,
644 T_OBJECT_size = 1,
645 T_ARRAY_size = 1,
646 T_NARROWOOP_size = 1,
647 T_NARROWKLASS_size = 1,
648 T_VOID_size = 0
649 };
650
651
652 // maps a BasicType to its instance field storage type:
653 // all sub-word integral types are widened to T_INT
654 extern BasicType type2field[T_CONFLICT+1];
655 extern BasicType type2wfield[T_CONFLICT+1];
656
657
658 // size in bytes
659 enum ArrayElementSize {
660 T_BOOLEAN_aelem_bytes = 1,
661 T_CHAR_aelem_bytes = 2,
662 T_FLOAT_aelem_bytes = 4,
663 T_DOUBLE_aelem_bytes = 8,
664 T_BYTE_aelem_bytes = 1,
665 T_SHORT_aelem_bytes = 2,
666 T_INT_aelem_bytes = 4,
667 T_LONG_aelem_bytes = 8,
668 #ifdef _LP64
669 T_OBJECT_aelem_bytes = 8,
670 T_ARRAY_aelem_bytes = 8,
671 #else
672 T_OBJECT_aelem_bytes = 4,
673 T_ARRAY_aelem_bytes = 4,
674 #endif
675 T_NARROWOOP_aelem_bytes = 4,
676 T_NARROWKLASS_aelem_bytes = 4,
677 T_VOID_aelem_bytes = 0
678 };
679
680 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
681 #ifdef ASSERT
682 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
683 #else
684 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
685 #endif
686
687
688 // JavaValue serves as a container for arbitrary Java values.
689
690 class JavaValue {
691
692 public:
693 typedef union JavaCallValue {
694 jfloat f;
695 jdouble d;
696 jint i;
697 jlong l;
698 jobject h;
699 } JavaCallValue;
700
701 private:
702 BasicType _type;
703 JavaCallValue _value;
704
705 public:
706 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
707
708 JavaValue(jfloat value) {
709 _type = T_FLOAT;
710 _value.f = value;
711 }
712
713 JavaValue(jdouble value) {
714 _type = T_DOUBLE;
715 _value.d = value;
716 }
717
718 jfloat get_jfloat() const { return _value.f; }
719 jdouble get_jdouble() const { return _value.d; }
720 jint get_jint() const { return _value.i; }
721 jlong get_jlong() const { return _value.l; }
722 jobject get_jobject() const { return _value.h; }
723 JavaCallValue* get_value_addr() { return &_value; }
724 BasicType get_type() const { return _type; }
725
726 void set_jfloat(jfloat f) { _value.f = f;}
727 void set_jdouble(jdouble d) { _value.d = d;}
728 void set_jint(jint i) { _value.i = i;}
729 void set_jlong(jlong l) { _value.l = l;}
730 void set_jobject(jobject h) { _value.h = h;}
731 void set_type(BasicType t) { _type = t; }
732
733 jboolean get_jboolean() const { return (jboolean) (_value.i);}
734 jbyte get_jbyte() const { return (jbyte) (_value.i);}
735 jchar get_jchar() const { return (jchar) (_value.i);}
736 jshort get_jshort() const { return (jshort) (_value.i);}
737
738 };
739
740
741 #define STACK_BIAS 0
742 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
743 // in order to extend the reach of the stack pointer.
744 #if defined(SPARC) && defined(_LP64)
745 #undef STACK_BIAS
746 #define STACK_BIAS 0x7ff
747 #endif
748
749
750 // TosState describes the top-of-stack state before and after the execution of
751 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
752 // registers. The TosState corresponds to the 'machine representation' of this cached
753 // value. There's 4 states corresponding to the JAVA types int, long, float & double
754 // as well as a 5th state in case the top-of-stack value is actually on the top
755 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
756 // state when it comes to machine representation but is used separately for (oop)
757 // type specific operations (e.g. verification code).
758
759 enum TosState { // describes the tos cache contents
760 btos = 0, // byte, bool tos cached
761 ztos = 1, // byte, bool tos cached
762 ctos = 2, // char tos cached
763 stos = 3, // short tos cached
764 itos = 4, // int tos cached
765 ltos = 5, // long tos cached
766 ftos = 6, // float tos cached
767 dtos = 7, // double tos cached
768 atos = 8, // object cached
769 vtos = 9, // tos not cached
770 number_of_states,
771 ilgl // illegal state: should not occur
772 };
773
774
775 inline TosState as_TosState(BasicType type) {
776 switch (type) {
777 case T_BYTE : return btos;
778 case T_BOOLEAN: return ztos;
779 case T_CHAR : return ctos;
780 case T_SHORT : return stos;
781 case T_INT : return itos;
782 case T_LONG : return ltos;
783 case T_FLOAT : return ftos;
784 case T_DOUBLE : return dtos;
785 case T_VOID : return vtos;
786 case T_ARRAY : // fall through
787 case T_OBJECT : return atos;
788 default : return ilgl;
789 }
790 }
791
792 inline BasicType as_BasicType(TosState state) {
793 switch (state) {
794 case btos : return T_BYTE;
795 case ztos : return T_BOOLEAN;
796 case ctos : return T_CHAR;
797 case stos : return T_SHORT;
798 case itos : return T_INT;
799 case ltos : return T_LONG;
800 case ftos : return T_FLOAT;
801 case dtos : return T_DOUBLE;
802 case atos : return T_OBJECT;
803 case vtos : return T_VOID;
804 default : return T_ILLEGAL;
805 }
806 }
807
808
809 // Helper function to convert BasicType info into TosState
810 // Note: Cannot define here as it uses global constant at the time being.
811 TosState as_TosState(BasicType type);
812
813
814 // JavaThreadState keeps track of which part of the code a thread is executing in. This
815 // information is needed by the safepoint code.
816 //
817 // There are 4 essential states:
818 //
819 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
820 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
821 // _thread_in_vm : Executing in the vm
822 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
823 //
824 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
825 // a transition from one state to another. These extra states makes it possible for the safepoint code to
826 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
827 //
828 // Given a state, the xxxx_trans state can always be found by adding 1.
829 //
830 enum JavaThreadState {
831 _thread_uninitialized = 0, // should never happen (missing initialization)
832 _thread_new = 2, // just starting up, i.e., in process of being initialized
833 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
834 _thread_in_native = 4, // running in native code
835 _thread_in_native_trans = 5, // corresponding transition state
836 _thread_in_vm = 6, // running in VM
837 _thread_in_vm_trans = 7, // corresponding transition state
838 _thread_in_Java = 8, // running in Java or in stub code
839 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
840 _thread_blocked = 10, // blocked in vm
841 _thread_blocked_trans = 11, // corresponding transition state
842 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
843 };
844
845
846
847 //----------------------------------------------------------------------------------------------------
848 // 'Forward' declarations of frequently used classes
849 // (in order to reduce interface dependencies & reduce
850 // number of unnecessary compilations after changes)
851
852 class ClassFileStream;
853
854 class Event;
855
856 class Thread;
857 class VMThread;
858 class JavaThread;
859 class Threads;
860
861 class VM_Operation;
862 class VMOperationQueue;
863
864 class CodeBlob;
865 class CompiledMethod;
866 class nmethod;
867 class RuntimeBlob;
868 class OSRAdapter;
869 class I2CAdapter;
870 class C2IAdapter;
871 class CompiledIC;
872 class relocInfo;
873 class ScopeDesc;
874 class PcDesc;
875
876 class Recompiler;
877 class Recompilee;
878 class RecompilationPolicy;
879 class RFrame;
880 class CompiledRFrame;
881 class InterpretedRFrame;
882
883 class vframe;
884 class javaVFrame;
885 class interpretedVFrame;
886 class compiledVFrame;
887 class deoptimizedVFrame;
888 class externalVFrame;
889 class entryVFrame;
890
891 class RegisterMap;
892
893 class Mutex;
894 class Monitor;
895 class BasicLock;
896 class BasicObjectLock;
897
898 class PeriodicTask;
899
900 class JavaCallWrapper;
901
902 class oopDesc;
903 class metaDataOopDesc;
904
905 class NativeCall;
906
907 class zone;
908
909 class StubQueue;
910
911 class outputStream;
912
913 class ResourceArea;
914
915 class DebugInformationRecorder;
916 class ScopeValue;
917 class CompressedStream;
918 class DebugInfoReadStream;
919 class DebugInfoWriteStream;
920 class LocationValue;
921 class ConstantValue;
922 class IllegalValue;
923
924 class PrivilegedElement;
925 class MonitorArray;
926
927 class MonitorInfo;
928
929 class OffsetClosure;
930 class OopMapCache;
931 class InterpreterOopMap;
932 class OopMapCacheEntry;
933 class OSThread;
934
935 typedef int (*OSThreadStartFunc)(void*);
936
937 class Space;
938
939 class JavaValue;
940 class methodHandle;
941 class JavaCallArguments;
942
943 // Basic support for errors.
944 extern void basic_fatal(const char* msg);
945
946 //----------------------------------------------------------------------------------------------------
947 // Special constants for debugging
948
949 const jint badInt = -3; // generic "bad int" value
950 const long badAddressVal = -2; // generic "bad address" value
951 const long badOopVal = -1; // generic "bad oop" value
952 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
953 const int badHandleValue = 0xBC; // value used to zap vm handle area
954 const int badResourceValue = 0xAB; // value used to zap resource area
955 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
956 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
957 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
958 const intptr_t badJNIHandleVal = (intptr_t) UCONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area
959 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
960 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
961 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
962 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
963
964
965 // (These must be implemented as #defines because C++ compilers are
966 // not obligated to inline non-integral constants!)
967 #define badAddress ((address)::badAddressVal)
968 #define badOop (cast_to_oop(::badOopVal))
969 #define badHeapWord (::badHeapWordVal)
970 #define badJNIHandle (cast_to_oop(::badJNIHandleVal))
971
972 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
973 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
974
975 //----------------------------------------------------------------------------------------------------
976 // Utility functions for bitfield manipulations
977
978 const intptr_t AllBits = ~0; // all bits set in a word
979 const intptr_t NoBits = 0; // no bits set in a word
980 const jlong NoLongBits = 0; // no bits set in a long
981 const intptr_t OneBit = 1; // only right_most bit set in a word
982
983 // get a word with the n.th or the right-most or left-most n bits set
984 // (note: #define used only so that they can be used in enum constant definitions)
985 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
986 #define right_n_bits(n) (nth_bit(n) - 1)
987 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
988
989 // bit-operations using a mask m
990 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
991 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
992 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
993 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
994 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
995
996 // bit-operations using the n.th bit
997 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
998 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
999 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1000
1001 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1002 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1003 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1004 }
1005
1006
1007 //----------------------------------------------------------------------------------------------------
1008 // Utility functions for integers
1009
1010 // Avoid use of global min/max macros which may cause unwanted double
1011 // evaluation of arguments.
1012 #ifdef max
1013 #undef max
1014 #endif
1015
1016 #ifdef min
1017 #undef min
1018 #endif
1019
1020 // The following defines serve the purpose of preventing use of accidentally
1021 // included min max macros from compiling, while continuing to allow innocent
1022 // min and max identifiers in the code to compile as intended.
1023 #define max max
1024 #define min min
1025
1026 // It is necessary to use templates here. Having normal overloaded
1027 // functions does not work because it is necessary to provide both 32-
1028 // and 64-bit overloaded functions, which does not work, and having
1029 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1030 // will be even more error-prone than macros.
1031 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1032 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1033 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1034 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1035 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1036 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1037
1038 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1039
1040 // true if x is a power of 2, false otherwise
1041 inline bool is_power_of_2(intptr_t x) {
1042 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1043 }
1044
1045 // long version of is_power_of_2
1046 inline bool is_power_of_2_long(jlong x) {
1047 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1048 }
1049
1050 // Returns largest i such that 2^i <= x.
1051 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1052 // If x == 0, the function returns -1.
1053 inline int log2_intptr(intptr_t x) {
1054 int i = -1;
1055 uintptr_t p = 1;
1056 while (p != 0 && p <= (uintptr_t)x) {
1057 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1058 i++; p *= 2;
1059 }
1060 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1061 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1062 return i;
1063 }
1064
1065 //* largest i such that 2^i <= x
1066 // A negative value of 'x' will return '63'
1067 inline int log2_long(jlong x) {
1068 int i = -1;
1069 julong p = 1;
1070 while (p != 0 && p <= (julong)x) {
1071 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1072 i++; p *= 2;
1073 }
1074 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1075 // (if p = 0 then overflow occurred and i = 63)
1076 return i;
1077 }
1078
1079 //* the argument must be exactly a power of 2
1080 inline int exact_log2(intptr_t x) {
1081 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1082 return log2_intptr(x);
1083 }
1084
1085 //* the argument must be exactly a power of 2
1086 inline int exact_log2_long(jlong x) {
1087 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1088 return log2_long(x);
1089 }
1090
1091 inline bool is_odd (intx x) { return x & 1; }
1092 inline bool is_even(intx x) { return !is_odd(x); }
1093
1094 // "to" should be greater than "from."
1095 inline intx byte_size(void* from, void* to) {
1096 return (address)to - (address)from;
1097 }
1098
1099 //----------------------------------------------------------------------------------------------------
1100 // Avoid non-portable casts with these routines (DEPRECATED)
1101
1102 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1103 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1104
1105 // Given sequence of four bytes, build into a 32-bit word
1106 // following the conventions used in class files.
1107 // On the 386, this could be realized with a simple address cast.
1108 //
1109
1110 // This routine takes eight bytes:
1111 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1112 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1113 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1114 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1115 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1116 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1117 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1118 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1119 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1120 }
1121
1122 // This routine takes four bytes:
1123 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1124 return (( u4(c1) << 24 ) & 0xff000000)
1125 | (( u4(c2) << 16 ) & 0x00ff0000)
1126 | (( u4(c3) << 8 ) & 0x0000ff00)
1127 | (( u4(c4) << 0 ) & 0x000000ff);
1128 }
1129
1130 // And this one works if the four bytes are contiguous in memory:
1131 inline u4 build_u4_from( u1* p ) {
1132 return build_u4_from( p[0], p[1], p[2], p[3] );
1133 }
1134
1135 // Ditto for two-byte ints:
1136 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1137 return u2((( u2(c1) << 8 ) & 0xff00)
1138 | (( u2(c2) << 0 ) & 0x00ff));
1139 }
1140
1141 // And this one works if the two bytes are contiguous in memory:
1142 inline u2 build_u2_from( u1* p ) {
1143 return build_u2_from( p[0], p[1] );
1144 }
1145
1146 // Ditto for floats:
1147 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1148 u4 u = build_u4_from( c1, c2, c3, c4 );
1149 return *(jfloat*)&u;
1150 }
1151
1152 inline jfloat build_float_from( u1* p ) {
1153 u4 u = build_u4_from( p );
1154 return *(jfloat*)&u;
1155 }
1156
1157
1158 // now (64-bit) longs
1159
1160 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1161 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1162 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1163 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1164 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1165 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1166 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1167 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1168 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1169 }
1170
1171 inline jlong build_long_from( u1* p ) {
1172 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1173 }
1174
1175
1176 // Doubles, too!
1177 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1178 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1179 return *(jdouble*)&u;
1180 }
1181
1182 inline jdouble build_double_from( u1* p ) {
1183 jlong u = build_long_from( p );
1184 return *(jdouble*)&u;
1185 }
1186
1187
1188 // Portable routines to go the other way:
1189
1190 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1191 c1 = u1(x >> 8);
1192 c2 = u1(x);
1193 }
1194
1195 inline void explode_short_to( u2 x, u1* p ) {
1196 explode_short_to( x, p[0], p[1]);
1197 }
1198
1199 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1200 c1 = u1(x >> 24);
1201 c2 = u1(x >> 16);
1202 c3 = u1(x >> 8);
1203 c4 = u1(x);
1204 }
1205
1206 inline void explode_int_to( u4 x, u1* p ) {
1207 explode_int_to( x, p[0], p[1], p[2], p[3]);
1208 }
1209
1210
1211 // Pack and extract shorts to/from ints:
1212
1213 inline int extract_low_short_from_int(jint x) {
1214 return x & 0xffff;
1215 }
1216
1217 inline int extract_high_short_from_int(jint x) {
1218 return (x >> 16) & 0xffff;
1219 }
1220
1221 inline int build_int_from_shorts( jushort low, jushort high ) {
1222 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1223 }
1224
1225 // Convert pointer to intptr_t, for use in printing pointers.
1226 inline intptr_t p2i(const void * p) {
1227 return (intptr_t) p;
1228 }
1229
1230 // swap a & b
1231 template<class T> static void swap(T& a, T& b) {
1232 T tmp = a;
1233 a = b;
1234 b = tmp;
1235 }
1236
1237 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1238
1239 //----------------------------------------------------------------------------------------------------
1240 // Sum and product which can never overflow: they wrap, just like the
1241 // Java operations. Note that we don't intend these to be used for
1242 // general-purpose arithmetic: their purpose is to emulate Java
1243 // operations.
1244
1245 // The goal of this code to avoid undefined or implementation-defined
1246 // behavior. The use of an lvalue to reference cast is explicitly
1247 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1248 // 15 in C++03]
1249 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1250 inline TYPE NAME (TYPE in1, TYPE in2) { \
1251 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1252 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1253 return reinterpret_cast<TYPE&>(ures); \
1254 }
1255
1256 JAVA_INTEGER_OP(+, java_add, jint, juint)
1257 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1258 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1259 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1260 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1261 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1262
1263 #undef JAVA_INTEGER_OP
1264
1265 // Dereference vptr
1266 // All C++ compilers that we know of have the vtbl pointer in the first
1267 // word. If there are exceptions, this function needs to be made compiler
1268 // specific.
1269 static inline void* dereference_vptr(const void* addr) {
1270 return *(void**)addr;
1271 }
1272
1273 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP