1 /*
2 * Copyright (c) 1997, 2020, 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 #ifndef SHARE_UTILITIES_GLOBALDEFINITIONS_HPP
26 #define SHARE_UTILITIES_GLOBALDEFINITIONS_HPP
27
28 #include "utilities/compilerWarnings.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 // Get constants like JVM_T_CHAR and JVM_SIGNATURE_INT, before pulling in <jvm.h>.
33 #include "classfile_constants.h"
34
35 #include COMPILER_HEADER(utilities/globalDefinitions)
36
37 // Defaults for macros that might be defined per compiler.
38 #ifndef NOINLINE
39 #define NOINLINE
40 #endif
41 #ifndef ALWAYSINLINE
42 #define ALWAYSINLINE inline
43 #endif
44
45 #ifndef ATTRIBUTE_ALIGNED
46 #define ATTRIBUTE_ALIGNED(x)
47 #endif
48
49 #ifndef ATTRIBUTE_FLATTEN
50 #define ATTRIBUTE_FLATTEN
51 #endif
52
53 // These are #defines to selectively turn on/off the Print(Opto)Assembly
54 // capabilities. Choices should be led by a tradeoff between
55 // code size and improved supportability.
56 // if PRINT_ASSEMBLY then PRINT_ABSTRACT_ASSEMBLY must be true as well
57 // to have a fallback in case hsdis is not available.
58 #if defined(PRODUCT)
59 #define SUPPORT_ABSTRACT_ASSEMBLY
60 #define SUPPORT_ASSEMBLY
61 #undef SUPPORT_OPTO_ASSEMBLY // Can't activate. In PRODUCT, many dump methods are missing.
62 #undef SUPPORT_DATA_STRUCTS // Of limited use. In PRODUCT, many print methods are empty.
63 #else
64 #define SUPPORT_ABSTRACT_ASSEMBLY
65 #define SUPPORT_ASSEMBLY
66 #define SUPPORT_OPTO_ASSEMBLY
67 #define SUPPORT_DATA_STRUCTS
68 #endif
69 #if defined(SUPPORT_ASSEMBLY) && !defined(SUPPORT_ABSTRACT_ASSEMBLY)
70 #define SUPPORT_ABSTRACT_ASSEMBLY
71 #endif
72
73 // This file holds all globally used constants & types, class (forward)
74 // declarations and a few frequently used utility functions.
75
76 // Declare the named class to be noncopyable. This macro must be used in
77 // a private part of the class's definition, followed by a semi-colon.
78 // Doing so provides private declarations for the class's copy constructor
79 // and assignment operator. Because these operations are private, most
80 // potential callers will fail to compile because they are inaccessible.
81 // The operations intentionally lack a definition, to provoke link-time
82 // failures for calls from contexts where they are accessible, e.g. from
83 // within the class or from a friend of the class.
84 // Note: The lack of definitions is still not completely bullet-proof, as
85 // an apparent call might be optimized away by copy elision.
86 // For C++11 the declarations should be changed to deleted definitions.
87 #define NONCOPYABLE(C) C(C const&); C& operator=(C const&) /* next token must be ; */
88
89 //----------------------------------------------------------------------------------------------------
90 // Printf-style formatters for fixed- and variable-width types as pointers and
91 // integers. These are derived from the definitions in inttypes.h. If the platform
92 // doesn't provide appropriate definitions, they should be provided in
93 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
94
95 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
96
97 // Format 32-bit quantities.
98 #define INT32_FORMAT "%" PRId32
99 #define UINT32_FORMAT "%" PRIu32
100 #define INT32_FORMAT_W(width) "%" #width PRId32
101 #define UINT32_FORMAT_W(width) "%" #width PRIu32
102
103 #define PTR32_FORMAT "0x%08" PRIx32
104 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
105
106 // Format 64-bit quantities.
107 #define INT64_FORMAT "%" PRId64
108 #define UINT64_FORMAT "%" PRIu64
109 #define UINT64_FORMAT_X "%" PRIx64
110 #define INT64_FORMAT_W(width) "%" #width PRId64
111 #define UINT64_FORMAT_W(width) "%" #width PRIu64
112 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64
113
114 #define PTR64_FORMAT "0x%016" PRIx64
115
116 // Format jlong, if necessary
117 #ifndef JLONG_FORMAT
118 #define JLONG_FORMAT INT64_FORMAT
119 #endif
120 #ifndef JLONG_FORMAT_W
121 #define JLONG_FORMAT_W(width) INT64_FORMAT_W(width)
122 #endif
123 #ifndef JULONG_FORMAT
124 #define JULONG_FORMAT UINT64_FORMAT
125 #endif
126 #ifndef JULONG_FORMAT_X
127 #define JULONG_FORMAT_X UINT64_FORMAT_X
128 #endif
129
130 // Format pointers which change size between 32- and 64-bit.
131 #ifdef _LP64
132 #define INTPTR_FORMAT "0x%016" PRIxPTR
133 #define PTR_FORMAT "0x%016" PRIxPTR
134 #else // !_LP64
135 #define INTPTR_FORMAT "0x%08" PRIxPTR
136 #define PTR_FORMAT "0x%08" PRIxPTR
137 #endif // _LP64
138
139 // Format pointers without leading zeros
140 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
141
142 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
143
144 #define SSIZE_FORMAT "%" PRIdPTR
145 #define SIZE_FORMAT "%" PRIuPTR
146 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
147 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
148 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
149 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
150
151 #define INTX_FORMAT "%" PRIdPTR
152 #define UINTX_FORMAT "%" PRIuPTR
153 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
154 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
155
156 //----------------------------------------------------------------------------------------------------
157 // Constants
158
159 const int LogBytesPerShort = 1;
160 const int LogBytesPerInt = 2;
161 #ifdef _LP64
162 const int LogBytesPerWord = 3;
163 #else
164 const int LogBytesPerWord = 2;
165 #endif
166 const int LogBytesPerLong = 3;
167
168 const int BytesPerShort = 1 << LogBytesPerShort;
169 const int BytesPerInt = 1 << LogBytesPerInt;
170 const int BytesPerWord = 1 << LogBytesPerWord;
171 const int BytesPerLong = 1 << LogBytesPerLong;
172
173 const int LogBitsPerByte = 3;
174 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
175 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
176 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
177 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
178
179 const int BitsPerByte = 1 << LogBitsPerByte;
180 const int BitsPerShort = 1 << LogBitsPerShort;
181 const int BitsPerInt = 1 << LogBitsPerInt;
182 const int BitsPerWord = 1 << LogBitsPerWord;
183 const int BitsPerLong = 1 << LogBitsPerLong;
184
185 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
186 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
187
188 const int WordsPerLong = 2; // Number of stack entries for longs
189
190 const int oopSize = sizeof(char*); // Full-width oop
191 extern int heapOopSize; // Oop within a java object
192 const int wordSize = sizeof(char*);
193 const int longSize = sizeof(jlong);
194 const int jintSize = sizeof(jint);
195 const int size_tSize = sizeof(size_t);
196
197 const int BytesPerOop = BytesPerWord; // Full-width oop
198
199 extern int LogBytesPerHeapOop; // Oop within a java object
200 extern int LogBitsPerHeapOop;
201 extern int BytesPerHeapOop;
202 extern int BitsPerHeapOop;
203
204 const int BitsPerJavaInteger = 32;
205 const int BitsPerJavaLong = 64;
206 const int BitsPerSize_t = size_tSize * BitsPerByte;
207
208 // Size of a char[] needed to represent a jint as a string in decimal.
209 const int jintAsStringSize = 12;
210
211 // An opaque type, so that HeapWord* can be a generic pointer into the heap.
212 // We require that object sizes be measured in units of heap words (e.g.
213 // pointer-sized values), so that given HeapWord* hw,
214 // hw += oop(hw)->foo();
215 // works, where foo is a method (like size or scavenge) that returns the
216 // object size.
217 class HeapWordImpl; // Opaque, never defined.
218 typedef HeapWordImpl* HeapWord;
219
220 // Analogous opaque struct for metadata allocated from metaspaces.
221 class MetaWordImpl; // Opaque, never defined.
222 typedef MetaWordImpl* MetaWord;
223
224 // HeapWordSize must be 2^LogHeapWordSize.
225 const int HeapWordSize = sizeof(HeapWord);
226 #ifdef _LP64
227 const int LogHeapWordSize = 3;
228 #else
229 const int LogHeapWordSize = 2;
230 #endif
231 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
232 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
233
234 // The minimum number of native machine words necessary to contain "byte_size"
235 // bytes.
236 inline size_t heap_word_size(size_t byte_size) {
237 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
238 }
239
240 //-------------------------------------------
241 // Constant for jlong (standardized by C++11)
242
243 // Build a 64bit integer constant
244 #define CONST64(x) (x ## LL)
245 #define UCONST64(x) (x ## ULL)
246
247 const jlong min_jlong = CONST64(0x8000000000000000);
248 const jlong max_jlong = CONST64(0x7fffffffffffffff);
249
250 const size_t K = 1024;
251 const size_t M = K*K;
252 const size_t G = M*K;
253 const size_t HWperKB = K / sizeof(HeapWord);
254
255 // Constants for converting from a base unit to milli-base units. For
256 // example from seconds to milliseconds and microseconds
257
258 const int MILLIUNITS = 1000; // milli units per base unit
259 const int MICROUNITS = 1000000; // micro units per base unit
260 const int NANOUNITS = 1000000000; // nano units per base unit
261 const int NANOUNITS_PER_MILLIUNIT = NANOUNITS / MILLIUNITS;
262
263 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
264 const jint NANOSECS_PER_MILLISEC = 1000000;
265
266
267 // Unit conversion functions
268 // The caller is responsible for considering overlow.
269
270 inline int64_t nanos_to_millis(int64_t nanos) {
271 return nanos / NANOUNITS_PER_MILLIUNIT;
272 }
273 inline int64_t millis_to_nanos(int64_t millis) {
274 return millis * NANOUNITS_PER_MILLIUNIT;
275 }
276
277 // Proper units routines try to maintain at least three significant digits.
278 // In worst case, it would print five significant digits with lower prefix.
279 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow,
280 // and therefore we need to be careful.
281
282 inline const char* proper_unit_for_byte_size(size_t s) {
283 #ifdef _LP64
284 if (s >= 100*G) {
285 return "G";
286 }
287 #endif
288 if (s >= 100*M) {
289 return "M";
290 } else if (s >= 100*K) {
291 return "K";
292 } else {
293 return "B";
294 }
295 }
296
297 template <class T>
298 inline T byte_size_in_proper_unit(T s) {
299 #ifdef _LP64
300 if (s >= 100*G) {
301 return (T)(s/G);
302 }
303 #endif
304 if (s >= 100*M) {
305 return (T)(s/M);
306 } else if (s >= 100*K) {
307 return (T)(s/K);
308 } else {
309 return s;
310 }
311 }
312
313 inline const char* exact_unit_for_byte_size(size_t s) {
314 #ifdef _LP64
315 if (s >= G && (s % G) == 0) {
316 return "G";
317 }
318 #endif
319 if (s >= M && (s % M) == 0) {
320 return "M";
321 }
322 if (s >= K && (s % K) == 0) {
323 return "K";
324 }
325 return "B";
326 }
327
328 inline size_t byte_size_in_exact_unit(size_t s) {
329 #ifdef _LP64
330 if (s >= G && (s % G) == 0) {
331 return s / G;
332 }
333 #endif
334 if (s >= M && (s % M) == 0) {
335 return s / M;
336 }
337 if (s >= K && (s % K) == 0) {
338 return s / K;
339 }
340 return s;
341 }
342
343 // Memory size transition formatting.
344
345 #define HEAP_CHANGE_FORMAT "%s: " SIZE_FORMAT "K(" SIZE_FORMAT "K)->" SIZE_FORMAT "K(" SIZE_FORMAT "K)"
346
347 #define HEAP_CHANGE_FORMAT_ARGS(_name_, _prev_used_, _prev_capacity_, _used_, _capacity_) \
348 (_name_), (_prev_used_) / K, (_prev_capacity_) / K, (_used_) / K, (_capacity_) / K
349
350 //----------------------------------------------------------------------------------------------------
351 // VM type definitions
352
353 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
354 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
355
356 typedef intptr_t intx;
357 typedef uintptr_t uintx;
358
359 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
360 const intx max_intx = (uintx)min_intx - 1;
361 const uintx max_uintx = (uintx)-1;
362
363 // Table of values:
364 // sizeof intx 4 8
365 // min_intx 0x80000000 0x8000000000000000
366 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
367 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
368
369 typedef unsigned int uint; NEEDS_CLEANUP
370
371
372 //----------------------------------------------------------------------------------------------------
373 // Java type definitions
374
375 // All kinds of 'plain' byte addresses
376 typedef signed char s_char;
377 typedef unsigned char u_char;
378 typedef u_char* address;
379 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
380 // except for some implementations of a C++
381 // linkage pointer to function. Should never
382 // need one of those to be placed in this
383 // type anyway.
384
385 // Utility functions to "portably" (?) bit twiddle pointers
386 // Where portable means keep ANSI C++ compilers quiet
387
388 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
389 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
390
391 // Utility functions to "portably" make cast to/from function pointers.
392
393 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
394 inline address_word castable_address(address x) { return address_word(x) ; }
395 inline address_word castable_address(void* x) { return address_word(x) ; }
396
397 // Pointer subtraction.
398 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
399 // the range we might need to find differences from one end of the heap
400 // to the other.
401 // A typical use might be:
402 // if (pointer_delta(end(), top()) >= size) {
403 // // enough room for an object of size
404 // ...
405 // and then additions like
406 // ... top() + size ...
407 // are safe because we know that top() is at least size below end().
408 inline size_t pointer_delta(const volatile void* left,
409 const volatile void* right,
410 size_t element_size) {
411 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
412 }
413
414 // A version specialized for HeapWord*'s.
415 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
416 return pointer_delta(left, right, sizeof(HeapWord));
417 }
418 // A version specialized for MetaWord*'s.
419 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
420 return pointer_delta(left, right, sizeof(MetaWord));
421 }
422
423 //
424 // ANSI C++ does not allow casting from one pointer type to a function pointer
425 // directly without at best a warning. This macro accomplishes it silently
426 // In every case that is present at this point the value be cast is a pointer
427 // to a C linkage function. In some case the type used for the cast reflects
428 // that linkage and a picky compiler would not complain. In other cases because
429 // there is no convenient place to place a typedef with extern C linkage (i.e
430 // a platform dependent header file) it doesn't. At this point no compiler seems
431 // picky enough to catch these instances (which are few). It is possible that
432 // using templates could fix these for all cases. This use of templates is likely
433 // so far from the middle of the road that it is likely to be problematic in
434 // many C++ compilers.
435 //
436 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
437 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
438
439 // Need the correct linkage to call qsort without warnings
440 extern "C" {
441 typedef int (*_sort_Fn)(const void *, const void *);
442 }
443
444 // Unsigned byte types for os and stream.hpp
445
446 // Unsigned one, two, four and eigth byte quantities used for describing
447 // the .class file format. See JVM book chapter 4.
448
449 typedef jubyte u1;
450 typedef jushort u2;
451 typedef juint u4;
452 typedef julong u8;
453
454 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
455 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
456 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
457 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
458
459 typedef jbyte s1;
460 typedef jshort s2;
461 typedef jint s4;
462 typedef jlong s8;
463
464 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
465 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
466 const jshort min_jshort = -(1 << 15); // smallest jshort
467 const jshort max_jshort = (1 << 15) - 1; // largest jshort
468
469 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
470 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
471
472 //----------------------------------------------------------------------------------------------------
473 // JVM spec restrictions
474
475 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
476
477 //----------------------------------------------------------------------------------------------------
478 // Object alignment, in units of HeapWords.
479 //
480 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
481 // reference fields can be naturally aligned.
482
483 extern int MinObjAlignment;
484 extern int MinObjAlignmentInBytes;
485 extern int MinObjAlignmentInBytesMask;
486
487 extern int LogMinObjAlignment;
488 extern int LogMinObjAlignmentInBytes;
489
490 const int LogKlassAlignmentInBytes = 3;
491 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
492 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
493 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
494
495 // Maximal size of heap where unscaled compression can be used. Also upper bound
496 // for heap placement: 4GB.
497 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
498 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
499 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
500 extern uint64_t OopEncodingHeapMax;
501
502 // Maximal size of compressed class space. Above this limit compression is not possible.
503 // Also upper bound for placement of zero based class space. (Class space is further limited
504 // to be < 3G, see arguments.cpp.)
505 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
506
507 // Machine dependent stuff
508
509 // The maximum size of the code cache. Can be overridden by targets.
510 #define CODE_CACHE_SIZE_LIMIT (2*G)
511 // Allow targets to reduce the default size of the code cache.
512 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
513
514 #include CPU_HEADER(globalDefinitions)
515
516 // To assure the IRIW property on processors that are not multiple copy
517 // atomic, sync instructions must be issued between volatile reads to
518 // assure their ordering, instead of after volatile stores.
519 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
520 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
521 #ifdef CPU_MULTI_COPY_ATOMIC
522 // Not needed.
523 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
524 #else
525 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment.
526 // Final decision is subject to JEP 188: Java Memory Model Update.
527 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false);
528 #endif
529
530 // The expected size in bytes of a cache line, used to pad data structures.
531 #ifndef DEFAULT_CACHE_LINE_SIZE
532 #define DEFAULT_CACHE_LINE_SIZE 64
533 #endif
534
535
536 //----------------------------------------------------------------------------------------------------
537 // Utility macros for compilers
538 // used to silence compiler warnings
539
540 #define Unused_Variable(var) var
541
542
543 //----------------------------------------------------------------------------------------------------
544 // Miscellaneous
545
546 // 6302670 Eliminate Hotspot __fabsf dependency
547 // All fabs() callers should call this function instead, which will implicitly
548 // convert the operand to double, avoiding a dependency on __fabsf which
549 // doesn't exist in early versions of Solaris 8.
550 inline double fabsd(double value) {
551 return fabs(value);
552 }
553
554 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
555 // is zero, return 0.0.
556 template<typename T>
557 inline double percent_of(T numerator, T denominator) {
558 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
559 }
560
561 //----------------------------------------------------------------------------------------------------
562 // Special casts
563 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
564 typedef union {
565 jfloat f;
566 jint i;
567 } FloatIntConv;
568
569 typedef union {
570 jdouble d;
571 jlong l;
572 julong ul;
573 } DoubleLongConv;
574
575 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
576 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
577
578 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
579 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
580 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
581
582 inline jint low (jlong value) { return jint(value); }
583 inline jint high(jlong value) { return jint(value >> 32); }
584
585 // the fancy casts are a hopefully portable way
586 // to do unsigned 32 to 64 bit type conversion
587 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
588 *value |= (jlong)(julong)(juint)low; }
589
590 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
591 *value |= (jlong)high << 32; }
592
593 inline jlong jlong_from(jint h, jint l) {
594 jlong result = 0; // initialization to avoid warning
595 set_high(&result, h);
596 set_low(&result, l);
597 return result;
598 }
599
600 union jlong_accessor {
601 jint words[2];
602 jlong long_value;
603 };
604
605 void basic_types_init(); // cannot define here; uses assert
606
607
608 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
609 enum BasicType {
610 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS.
611 T_BOOLEAN = JVM_T_BOOLEAN,
612 T_CHAR = JVM_T_CHAR,
613 T_FLOAT = JVM_T_FLOAT,
614 T_DOUBLE = JVM_T_DOUBLE,
615 T_BYTE = JVM_T_BYTE,
616 T_SHORT = JVM_T_SHORT,
617 T_INT = JVM_T_INT,
618 T_LONG = JVM_T_LONG,
619 // The remaining values are not part of any standard.
620 // T_OBJECT and T_VOID denote two more semantic choices
621 // for method return values.
622 // T_OBJECT and T_ARRAY describe signature syntax.
623 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe
624 // internal references within the JVM as if they were Java
625 // types in their own right.
626 T_OBJECT = 12,
627 T_ARRAY = 13,
628 T_VOID = 14,
629 T_ADDRESS = 15,
630 T_NARROWOOP = 16,
631 T_METADATA = 17,
632 T_NARROWKLASS = 18,
633 T_CONFLICT = 19, // for stack value type with conflicting contents
634 T_ILLEGAL = 99
635 };
636
637 #define SIGNATURE_TYPES_DO(F, N) \
638 F(JVM_SIGNATURE_BOOLEAN, T_BOOLEAN, N) \
639 F(JVM_SIGNATURE_CHAR, T_CHAR, N) \
640 F(JVM_SIGNATURE_FLOAT, T_FLOAT, N) \
641 F(JVM_SIGNATURE_DOUBLE, T_DOUBLE, N) \
642 F(JVM_SIGNATURE_BYTE, T_BYTE, N) \
643 F(JVM_SIGNATURE_SHORT, T_SHORT, N) \
644 F(JVM_SIGNATURE_INT, T_INT, N) \
645 F(JVM_SIGNATURE_LONG, T_LONG, N) \
646 F(JVM_SIGNATURE_CLASS, T_OBJECT, N) \
647 F(JVM_SIGNATURE_ARRAY, T_ARRAY, N) \
648 F(JVM_SIGNATURE_VOID, T_VOID, N) \
649 /*end*/
650
651 inline bool is_java_type(BasicType t) {
652 return T_BOOLEAN <= t && t <= T_VOID;
653 }
654
655 inline bool is_java_primitive(BasicType t) {
656 return T_BOOLEAN <= t && t <= T_LONG;
657 }
658
659 inline bool is_subword_type(BasicType t) {
660 // these guys are processed exactly like T_INT in calling sequences:
661 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
662 }
663
664 inline bool is_signed_subword_type(BasicType t) {
665 return (t == T_BYTE || t == T_SHORT);
666 }
667
668 inline bool is_double_word_type(BasicType t) {
669 return (t == T_DOUBLE || t == T_LONG);
670 }
671
672 inline bool is_reference_type(BasicType t) {
673 return (t == T_OBJECT || t == T_ARRAY);
674 }
675
676 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
677 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
678 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
679 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
680 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
681 extern BasicType name2type(const char* name);
682
683 // Auxiliary math routines
684 // least common multiple
685 extern size_t lcm(size_t a, size_t b);
686
687
688 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
689 enum BasicTypeSize {
690 T_BOOLEAN_size = 1,
691 T_CHAR_size = 1,
692 T_FLOAT_size = 1,
693 T_DOUBLE_size = 2,
694 T_BYTE_size = 1,
695 T_SHORT_size = 1,
696 T_INT_size = 1,
697 T_LONG_size = 2,
698 T_OBJECT_size = 1,
699 T_ARRAY_size = 1,
700 T_NARROWOOP_size = 1,
701 T_NARROWKLASS_size = 1,
702 T_VOID_size = 0
703 };
704
705 // this works on valid parameter types but not T_VOID, T_CONFLICT, etc.
706 inline int parameter_type_word_count(BasicType t) {
707 if (is_double_word_type(t)) return 2;
708 assert(is_java_primitive(t) || is_reference_type(t), "no goofy types here please");
709 assert(type2size[t] == 1, "must be");
710 return 1;
711 }
712
713 // maps a BasicType to its instance field storage type:
714 // all sub-word integral types are widened to T_INT
715 extern BasicType type2field[T_CONFLICT+1];
716 extern BasicType type2wfield[T_CONFLICT+1];
717
718
719 // size in bytes
720 enum ArrayElementSize {
721 T_BOOLEAN_aelem_bytes = 1,
722 T_CHAR_aelem_bytes = 2,
723 T_FLOAT_aelem_bytes = 4,
724 T_DOUBLE_aelem_bytes = 8,
725 T_BYTE_aelem_bytes = 1,
726 T_SHORT_aelem_bytes = 2,
727 T_INT_aelem_bytes = 4,
728 T_LONG_aelem_bytes = 8,
729 #ifdef _LP64
730 T_OBJECT_aelem_bytes = 8,
731 T_ARRAY_aelem_bytes = 8,
732 #else
733 T_OBJECT_aelem_bytes = 4,
734 T_ARRAY_aelem_bytes = 4,
735 #endif
736 T_NARROWOOP_aelem_bytes = 4,
737 T_NARROWKLASS_aelem_bytes = 4,
738 T_VOID_aelem_bytes = 0
739 };
740
741 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
742 #ifdef ASSERT
743 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
744 #else
745 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
746 #endif
747
748
749 // JavaValue serves as a container for arbitrary Java values.
750
751 class JavaValue {
752
753 public:
754 typedef union JavaCallValue {
755 jfloat f;
756 jdouble d;
757 jint i;
758 jlong l;
759 jobject h;
760 } JavaCallValue;
761
762 private:
763 BasicType _type;
764 JavaCallValue _value;
765
766 public:
767 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
768
769 JavaValue(jfloat value) {
770 _type = T_FLOAT;
771 _value.f = value;
772 }
773
774 JavaValue(jdouble value) {
775 _type = T_DOUBLE;
776 _value.d = value;
777 }
778
779 jfloat get_jfloat() const { return _value.f; }
780 jdouble get_jdouble() const { return _value.d; }
781 jint get_jint() const { return _value.i; }
782 jlong get_jlong() const { return _value.l; }
783 jobject get_jobject() const { return _value.h; }
784 JavaCallValue* get_value_addr() { return &_value; }
785 BasicType get_type() const { return _type; }
786
787 void set_jfloat(jfloat f) { _value.f = f;}
788 void set_jdouble(jdouble d) { _value.d = d;}
789 void set_jint(jint i) { _value.i = i;}
790 void set_jlong(jlong l) { _value.l = l;}
791 void set_jobject(jobject h) { _value.h = h;}
792 void set_type(BasicType t) { _type = t; }
793
794 jboolean get_jboolean() const { return (jboolean) (_value.i);}
795 jbyte get_jbyte() const { return (jbyte) (_value.i);}
796 jchar get_jchar() const { return (jchar) (_value.i);}
797 jshort get_jshort() const { return (jshort) (_value.i);}
798
799 };
800
801
802 // TosState describes the top-of-stack state before and after the execution of
803 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
804 // registers. The TosState corresponds to the 'machine representation' of this cached
805 // value. There's 4 states corresponding to the JAVA types int, long, float & double
806 // as well as a 5th state in case the top-of-stack value is actually on the top
807 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
808 // state when it comes to machine representation but is used separately for (oop)
809 // type specific operations (e.g. verification code).
810
811 enum TosState { // describes the tos cache contents
812 btos = 0, // byte, bool tos cached
813 ztos = 1, // byte, bool tos cached
814 ctos = 2, // char tos cached
815 stos = 3, // short tos cached
816 itos = 4, // int tos cached
817 ltos = 5, // long tos cached
818 ftos = 6, // float tos cached
819 dtos = 7, // double tos cached
820 atos = 8, // object cached
821 vtos = 9, // tos not cached
822 number_of_states,
823 ilgl // illegal state: should not occur
824 };
825
826
827 inline TosState as_TosState(BasicType type) {
828 switch (type) {
829 case T_BYTE : return btos;
830 case T_BOOLEAN: return ztos;
831 case T_CHAR : return ctos;
832 case T_SHORT : return stos;
833 case T_INT : return itos;
834 case T_LONG : return ltos;
835 case T_FLOAT : return ftos;
836 case T_DOUBLE : return dtos;
837 case T_VOID : return vtos;
838 case T_ARRAY : // fall through
839 case T_OBJECT : return atos;
840 default : return ilgl;
841 }
842 }
843
844 inline BasicType as_BasicType(TosState state) {
845 switch (state) {
846 case btos : return T_BYTE;
847 case ztos : return T_BOOLEAN;
848 case ctos : return T_CHAR;
849 case stos : return T_SHORT;
850 case itos : return T_INT;
851 case ltos : return T_LONG;
852 case ftos : return T_FLOAT;
853 case dtos : return T_DOUBLE;
854 case atos : return T_OBJECT;
855 case vtos : return T_VOID;
856 default : return T_ILLEGAL;
857 }
858 }
859
860
861 // Helper function to convert BasicType info into TosState
862 // Note: Cannot define here as it uses global constant at the time being.
863 TosState as_TosState(BasicType type);
864
865
866 // JavaThreadState keeps track of which part of the code a thread is executing in. This
867 // information is needed by the safepoint code.
868 //
869 // There are 4 essential states:
870 //
871 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
872 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
873 // _thread_in_vm : Executing in the vm
874 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
875 //
876 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
877 // a transition from one state to another. These extra states makes it possible for the safepoint code to
878 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
879 //
880 // Given a state, the xxxx_trans state can always be found by adding 1.
881 //
882 enum JavaThreadState {
883 _thread_uninitialized = 0, // should never happen (missing initialization)
884 _thread_new = 2, // just starting up, i.e., in process of being initialized
885 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
886 _thread_in_native = 4, // running in native code
887 _thread_in_native_trans = 5, // corresponding transition state
888 _thread_in_vm = 6, // running in VM
889 _thread_in_vm_trans = 7, // corresponding transition state
890 _thread_in_Java = 8, // running in Java or in stub code
891 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
892 _thread_blocked = 10, // blocked in vm
893 _thread_blocked_trans = 11, // corresponding transition state
894 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
895 };
896
897 //----------------------------------------------------------------------------------------------------
898 // Special constants for debugging
899
900 const jint badInt = -3; // generic "bad int" value
901 const intptr_t badAddressVal = -2; // generic "bad address" value
902 const intptr_t badOopVal = -1; // generic "bad oop" value
903 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
904 const int badStackSegVal = 0xCA; // value used to zap stack segments
905 const int badHandleValue = 0xBC; // value used to zap vm handle area
906 const int badResourceValue = 0xAB; // value used to zap resource area
907 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
908 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
909 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
910 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
911 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
912 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
913 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
914
915
916 // (These must be implemented as #defines because C++ compilers are
917 // not obligated to inline non-integral constants!)
918 #define badAddress ((address)::badAddressVal)
919 #define badOop (cast_to_oop(::badOopVal))
920 #define badHeapWord (::badHeapWordVal)
921
922 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
923 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
924
925 //----------------------------------------------------------------------------------------------------
926 // Utility functions for bitfield manipulations
927
928 const intptr_t AllBits = ~0; // all bits set in a word
929 const intptr_t NoBits = 0; // no bits set in a word
930 const jlong NoLongBits = 0; // no bits set in a long
931 const intptr_t OneBit = 1; // only right_most bit set in a word
932
933 // get a word with the n.th or the right-most or left-most n bits set
934 // (note: #define used only so that they can be used in enum constant definitions)
935 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
936 #define right_n_bits(n) (nth_bit(n) - 1)
937 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
938
939 // bit-operations using a mask m
940 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
941 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
942 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
943 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
944 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
945
946 // bit-operations using the n.th bit
947 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
948 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
949 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
950
951 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
952 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
953 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
954 }
955
956
957 //----------------------------------------------------------------------------------------------------
958 // Utility functions for integers
959
960 // Avoid use of global min/max macros which may cause unwanted double
961 // evaluation of arguments.
962 #ifdef max
963 #undef max
964 #endif
965
966 #ifdef min
967 #undef min
968 #endif
969
970 // It is necessary to use templates here. Having normal overloaded
971 // functions does not work because it is necessary to provide both 32-
972 // and 64-bit overloaded functions, which does not work, and having
973 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
974 // will be even more error-prone than macros.
975 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
976 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
977 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
978 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
979 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
980 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
981
982 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
983
984 // Return the given value clamped to the range [min ... max]
985 template<typename T>
986 inline T clamp(T value, T min, T max) {
987 assert(min <= max, "must be");
988 return MIN2(MAX2(value, min), max);
989 }
990
991 // Returns largest i such that 2^i <= x.
992 // If x == 0, the function returns -1.
993 inline int log2_intptr(uintptr_t x) {
994 int i = -1;
995 uintptr_t p = 1;
996 while (p != 0 && p <= x) {
997 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
998 i++; p *= 2;
999 }
1000 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1001 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1002 return i;
1003 }
1004
1005 //* largest i such that 2^i <= x
1006 inline int log2_long(julong x) {
1007 int i = -1;
1008 julong p = 1;
1009 while (p != 0 && p <= x) {
1010 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1011 i++; p *= 2;
1012 }
1013 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1014 // (if p = 0 then overflow occurred and i = 63)
1015 return i;
1016 }
1017
1018 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1019 inline int log2_intptr(intptr_t x) {
1020 return log2_intptr((uintptr_t)x);
1021 }
1022
1023 inline int log2_int(int x) {
1024 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
1025 return log2_intptr((uintptr_t)(unsigned int)x);
1026 }
1027
1028 inline int log2_jint(jint x) {
1029 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1030 return log2_intptr((uintptr_t)(juint)x);
1031 }
1032
1033 inline int log2_uint(uint x) {
1034 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1035 return log2_intptr((uintptr_t)x);
1036 }
1037
1038 // A negative value of 'x' will return '63'
1039 inline int log2_jlong(jlong x) {
1040 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1041 return log2_long((julong)x);
1042 }
1043
1044 inline bool is_odd (intx x) { return x & 1; }
1045 inline bool is_even(intx x) { return !is_odd(x); }
1046
1047 // abs methods which cannot overflow and so are well-defined across
1048 // the entire domain of integer types.
1049 static inline unsigned int uabs(unsigned int n) {
1050 union {
1051 unsigned int result;
1052 int value;
1053 };
1054 result = n;
1055 if (value < 0) result = 0-result;
1056 return result;
1057 }
1058 static inline julong uabs(julong n) {
1059 union {
1060 julong result;
1061 jlong value;
1062 };
1063 result = n;
1064 if (value < 0) result = 0-result;
1065 return result;
1066 }
1067 static inline julong uabs(jlong n) { return uabs((julong)n); }
1068 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1069
1070 // "to" should be greater than "from."
1071 inline intx byte_size(void* from, void* to) {
1072 return (address)to - (address)from;
1073 }
1074
1075
1076 // Pack and extract shorts to/from ints:
1077
1078 inline int extract_low_short_from_int(jint x) {
1079 return x & 0xffff;
1080 }
1081
1082 inline int extract_high_short_from_int(jint x) {
1083 return (x >> 16) & 0xffff;
1084 }
1085
1086 inline int build_int_from_shorts( jushort low, jushort high ) {
1087 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1088 }
1089
1090 // Convert pointer to intptr_t, for use in printing pointers.
1091 inline intptr_t p2i(const void * p) {
1092 return (intptr_t) p;
1093 }
1094
1095 // swap a & b
1096 template<class T> static void swap(T& a, T& b) {
1097 T tmp = a;
1098 a = b;
1099 b = tmp;
1100 }
1101
1102 // array_size_impl is a function that takes a reference to T[N] and
1103 // returns a reference to char[N]. It is not ODR-used, so not defined.
1104 template<typename T, size_t N> char (&array_size_impl(T (&)[N]))[N];
1105
1106 #define ARRAY_SIZE(array) sizeof(array_size_impl(array))
1107
1108 //----------------------------------------------------------------------------------------------------
1109 // Sum and product which can never overflow: they wrap, just like the
1110 // Java operations. Note that we don't intend these to be used for
1111 // general-purpose arithmetic: their purpose is to emulate Java
1112 // operations.
1113
1114 // The goal of this code to avoid undefined or implementation-defined
1115 // behavior. The use of an lvalue to reference cast is explicitly
1116 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1117 // 15 in C++03]
1118 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1119 inline TYPE NAME (TYPE in1, TYPE in2) { \
1120 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1121 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1122 return reinterpret_cast<TYPE&>(ures); \
1123 }
1124
1125 JAVA_INTEGER_OP(+, java_add, jint, juint)
1126 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1127 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1128 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1129 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1130 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1131
1132 #undef JAVA_INTEGER_OP
1133
1134 // Provide integer shift operations with Java semantics. No overflow
1135 // issues - left shifts simply discard shifted out bits. No undefined
1136 // behavior for large or negative shift quantities; instead the actual
1137 // shift distance is the argument modulo the lhs value's size in bits.
1138 // No undefined or implementation defined behavior for shifting negative
1139 // values; left shift discards bits, right shift sign extends. We use
1140 // the same safe conversion technique as above for java_add and friends.
1141 #define JAVA_INTEGER_SHIFT_OP(OP, NAME, TYPE, XTYPE) \
1142 inline TYPE NAME (TYPE lhs, jint rhs) { \
1143 const uint rhs_mask = (sizeof(TYPE) * 8) - 1; \
1144 STATIC_ASSERT(rhs_mask == 31 || rhs_mask == 63); \
1145 XTYPE xres = static_cast<XTYPE>(lhs); \
1146 xres OP ## = (rhs & rhs_mask); \
1147 return reinterpret_cast<TYPE&>(xres); \
1148 }
1149
1150 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jint, juint)
1151 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jlong, julong)
1152 // For signed shift right, assume C++ implementation >> sign extends.
1153 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jint, jint)
1154 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jlong, jlong)
1155 // For >>> use C++ unsigned >>.
1156 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jint, juint)
1157 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jlong, julong)
1158
1159 #undef JAVA_INTEGER_SHIFT_OP
1160
1161 //----------------------------------------------------------------------------------------------------
1162 // The goal of this code is to provide saturating operations for int/uint.
1163 // Checks overflow conditions and saturates the result to min_jint/max_jint.
1164 #define SATURATED_INTEGER_OP(OP, NAME, TYPE1, TYPE2) \
1165 inline int NAME (TYPE1 in1, TYPE2 in2) { \
1166 jlong res = static_cast<jlong>(in1); \
1167 res OP ## = static_cast<jlong>(in2); \
1168 if (res > max_jint) { \
1169 res = max_jint; \
1170 } else if (res < min_jint) { \
1171 res = min_jint; \
1172 } \
1173 return static_cast<int>(res); \
1174 }
1175
1176 SATURATED_INTEGER_OP(+, saturated_add, int, int)
1177 SATURATED_INTEGER_OP(+, saturated_add, int, uint)
1178 SATURATED_INTEGER_OP(+, saturated_add, uint, int)
1179 SATURATED_INTEGER_OP(+, saturated_add, uint, uint)
1180
1181 #undef SATURATED_INTEGER_OP
1182
1183 // Dereference vptr
1184 // All C++ compilers that we know of have the vtbl pointer in the first
1185 // word. If there are exceptions, this function needs to be made compiler
1186 // specific.
1187 static inline void* dereference_vptr(const void* addr) {
1188 return *(void**)addr;
1189 }
1190
1191 //----------------------------------------------------------------------------------------------------
1192 // String type aliases used by command line flag declarations and
1193 // processing utilities.
1194
1195 typedef const char* ccstr;
1196 typedef const char* ccstrlist; // represents string arguments which accumulate
1197
1198 //----------------------------------------------------------------------------------------------------
1199 // Default hash/equals functions used by ResourceHashtable and KVHashtable
1200
1201 template<typename K> unsigned primitive_hash(const K& k) {
1202 unsigned hash = (unsigned)((uintptr_t)k);
1203 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs
1204 }
1205
1206 template<typename K> bool primitive_equals(const K& k0, const K& k1) {
1207 return k0 == k1;
1208 }
1209
1210
1211 #endif // SHARE_UTILITIES_GLOBALDEFINITIONS_HPP