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.
22 *
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 // These are #defines to selectively turn on/off the Print(Opto)Assembly
50 // capabilities. Choices should be led by a tradeoff between
51 // code size and improved supportability.
52 // if PRINT_ASSEMBLY then PRINT_ABSTRACT_ASSEMBLY must be true as well
53 // to have a fallback in case hsdis is not available.
54 #if defined(PRODUCT)
55 #define SUPPORT_ABSTRACT_ASSEMBLY
56 #define SUPPORT_ASSEMBLY
57 #undef SUPPORT_OPTO_ASSEMBLY // Can't activate. In PRODUCT, many dump methods are missing.
58 #undef SUPPORT_DATA_STRUCTS // Of limited use. In PRODUCT, many print methods are empty.
59 #else
60 #define SUPPORT_ABSTRACT_ASSEMBLY
61 #define SUPPORT_ASSEMBLY
62 #define SUPPORT_OPTO_ASSEMBLY
63 #define SUPPORT_DATA_STRUCTS
64 #endif
65 #if defined(SUPPORT_ASSEMBLY) && !defined(SUPPORT_ABSTRACT_ASSEMBLY)
66 #define SUPPORT_ABSTRACT_ASSEMBLY
67 #endif
68
69 // This file holds all globally used constants & types, class (forward)
70 // declarations and a few frequently used utility functions.
71
72 // Declare the named class to be noncopyable. This macro must be used in
73 // a private part of the class's definition, followed by a semi-colon.
74 // Doing so provides private declarations for the class's copy constructor
75 // and assignment operator. Because these operations are private, most
76 // potential callers will fail to compile because they are inaccessible.
77 // The operations intentionally lack a definition, to provoke link-time
78 // failures for calls from contexts where they are accessible, e.g. from
79 // within the class or from a friend of the class.
80 // Note: The lack of definitions is still not completely bullet-proof, as
81 // an apparent call might be optimized away by copy elision.
82 // For C++11 the declarations should be changed to deleted definitions.
83 #define NONCOPYABLE(C) C(C const&); C& operator=(C const&) /* next token must be ; */
84
85 //----------------------------------------------------------------------------------------------------
86 // Printf-style formatters for fixed- and variable-width types as pointers and
87 // integers. These are derived from the definitions in inttypes.h. If the platform
88 // doesn't provide appropriate definitions, they should be provided in
89 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
90
91 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
92
93 // Format 32-bit quantities.
94 #define INT32_FORMAT "%" PRId32
95 #define UINT32_FORMAT "%" PRIu32
96 #define INT32_FORMAT_W(width) "%" #width PRId32
97 #define UINT32_FORMAT_W(width) "%" #width PRIu32
98
99 #define PTR32_FORMAT "0x%08" PRIx32
100 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
101
102 // Format 64-bit quantities.
103 #define INT64_FORMAT "%" PRId64
104 #define UINT64_FORMAT "%" PRIu64
105 #define UINT64_FORMAT_X "%" PRIx64
106 #define INT64_FORMAT_W(width) "%" #width PRId64
107 #define UINT64_FORMAT_W(width) "%" #width PRIu64
108 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64
109
110 #define PTR64_FORMAT "0x%016" PRIx64
111
112 // Format jlong, if necessary
113 #ifndef JLONG_FORMAT
114 #define JLONG_FORMAT INT64_FORMAT
115 #endif
116 #ifndef JLONG_FORMAT_W
117 #define JLONG_FORMAT_W(width) INT64_FORMAT_W(width)
118 #endif
119 #ifndef JULONG_FORMAT
120 #define JULONG_FORMAT UINT64_FORMAT
121 #endif
122 #ifndef JULONG_FORMAT_X
123 #define JULONG_FORMAT_X UINT64_FORMAT_X
124 #endif
125
126 // Format pointers which change size between 32- and 64-bit.
127 #ifdef _LP64
128 #define INTPTR_FORMAT "0x%016" PRIxPTR
129 #define PTR_FORMAT "0x%016" PRIxPTR
130 #else // !_LP64
131 #define INTPTR_FORMAT "0x%08" PRIxPTR
132 #define PTR_FORMAT "0x%08" PRIxPTR
133 #endif // _LP64
134
135 // Format pointers without leading zeros
136 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
137
138 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
139
140 #define SSIZE_FORMAT "%" PRIdPTR
141 #define SIZE_FORMAT "%" PRIuPTR
142 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
143 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
144 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
145 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
146
147 #define INTX_FORMAT "%" PRIdPTR
148 #define UINTX_FORMAT "%" PRIuPTR
149 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
150 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
151
152 //----------------------------------------------------------------------------------------------------
153 // Constants
154
155 const int LogBytesPerShort = 1;
156 const int LogBytesPerInt = 2;
157 #ifdef _LP64
158 const int LogBytesPerWord = 3;
159 #else
160 const int LogBytesPerWord = 2;
161 #endif
162 const int LogBytesPerLong = 3;
163
164 const int BytesPerShort = 1 << LogBytesPerShort;
165 const int BytesPerInt = 1 << LogBytesPerInt;
166 const int BytesPerWord = 1 << LogBytesPerWord;
167 const int BytesPerLong = 1 << LogBytesPerLong;
168
169 const int LogBitsPerByte = 3;
170 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
171 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
172 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
173 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
174
175 const int BitsPerByte = 1 << LogBitsPerByte;
176 const int BitsPerShort = 1 << LogBitsPerShort;
177 const int BitsPerInt = 1 << LogBitsPerInt;
178 const int BitsPerWord = 1 << LogBitsPerWord;
179 const int BitsPerLong = 1 << LogBitsPerLong;
180
181 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
182 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
183
184 const int WordsPerLong = 2; // Number of stack entries for longs
185
186 const int oopSize = sizeof(char*); // Full-width oop
187 extern int heapOopSize; // Oop within a java object
188 const int wordSize = sizeof(char*);
189 const int longSize = sizeof(jlong);
190 const int jintSize = sizeof(jint);
191 const int size_tSize = sizeof(size_t);
192
193 const int BytesPerOop = BytesPerWord; // Full-width oop
194
195 extern int LogBytesPerHeapOop; // Oop within a java object
196 extern int LogBitsPerHeapOop;
197 extern int BytesPerHeapOop;
198 extern int BitsPerHeapOop;
199
200 const int BitsPerJavaInteger = 32;
201 const int BitsPerJavaLong = 64;
202 const int BitsPerSize_t = size_tSize * BitsPerByte;
203
204 // Size of a char[] needed to represent a jint as a string in decimal.
205 const int jintAsStringSize = 12;
206
207 // An opaque type, so that HeapWord* can be a generic pointer into the heap.
208 // We require that object sizes be measured in units of heap words (e.g.
209 // pointer-sized values), so that given HeapWord* hw,
210 // hw += oop(hw)->foo();
211 // works, where foo is a method (like size or scavenge) that returns the
212 // object size.
213 class HeapWordImpl; // Opaque, never defined.
214 typedef HeapWordImpl* HeapWord;
215
216 // Analogous opaque struct for metadata allocated from metaspaces.
217 class MetaWordImpl; // Opaque, never defined.
218 typedef MetaWordImpl* MetaWord;
219
220 // HeapWordSize must be 2^LogHeapWordSize.
221 const int HeapWordSize = sizeof(HeapWord);
222 #ifdef _LP64
223 const int LogHeapWordSize = 3;
224 #else
225 const int LogHeapWordSize = 2;
226 #endif
227 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
228 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
229
230 // The minimum number of native machine words necessary to contain "byte_size"
231 // bytes.
232 inline size_t heap_word_size(size_t byte_size) {
233 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
234 }
235
236 inline jfloat jfloat_cast(jint x);
237 inline jdouble jdouble_cast(jlong x);
238
239 //-------------------------------------------
240 // Constant for jlong (standardized by C++11)
241
242 // Build a 64bit integer constant
243 #define CONST64(x) (x ## LL)
244 #define UCONST64(x) (x ## ULL)
245
246 const jlong min_jlong = CONST64(0x8000000000000000);
247 const jlong max_jlong = CONST64(0x7fffffffffffffff);
248
249 //-------------------------------------------
250 // Constant for jdouble
251 const jlong min_jlongDouble = CONST64(0x0000000000000001);
252 const jdouble min_jdouble = jdouble_cast(min_jlongDouble);
253 const jlong max_jlongDouble = CONST64(0x7fefffffffffffff);
254 const jdouble max_jdouble = jdouble_cast(max_jlongDouble);
255
256 const size_t K = 1024;
257 const size_t M = K*K;
258 const size_t G = M*K;
259 const size_t HWperKB = K / sizeof(HeapWord);
260
261 // Constants for converting from a base unit to milli-base units. For
262 // example from seconds to milliseconds and microseconds
263
264 const int MILLIUNITS = 1000; // milli units per base unit
265 const int MICROUNITS = 1000000; // micro units per base unit
266 const int NANOUNITS = 1000000000; // nano units per base unit
267 const int NANOUNITS_PER_MILLIUNIT = NANOUNITS / MILLIUNITS;
268
269 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
270 const jint NANOSECS_PER_MILLISEC = 1000000;
271
272
273 // Unit conversion functions
274 // The caller is responsible for considering overlow.
275
276 inline int64_t nanos_to_millis(int64_t nanos) {
277 return nanos / NANOUNITS_PER_MILLIUNIT;
278 }
279 inline int64_t millis_to_nanos(int64_t millis) {
280 return millis * NANOUNITS_PER_MILLIUNIT;
281 }
282
283 // Proper units routines try to maintain at least three significant digits.
284 // In worst case, it would print five significant digits with lower prefix.
285 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow,
286 // and therefore we need to be careful.
287
288 inline const char* proper_unit_for_byte_size(size_t s) {
289 #ifdef _LP64
290 if (s >= 100*G) {
291 return "G";
292 }
293 #endif
294 if (s >= 100*M) {
295 return "M";
296 } else if (s >= 100*K) {
297 return "K";
298 } else {
299 return "B";
300 }
301 }
302
303 template <class T>
304 inline T byte_size_in_proper_unit(T s) {
305 #ifdef _LP64
306 if (s >= 100*G) {
307 return (T)(s/G);
308 }
309 #endif
310 if (s >= 100*M) {
311 return (T)(s/M);
312 } else if (s >= 100*K) {
313 return (T)(s/K);
314 } else {
315 return s;
316 }
317 }
318
319 inline const char* exact_unit_for_byte_size(size_t s) {
320 #ifdef _LP64
321 if (s >= G && (s % G) == 0) {
322 return "G";
323 }
324 #endif
325 if (s >= M && (s % M) == 0) {
326 return "M";
327 }
328 if (s >= K && (s % K) == 0) {
329 return "K";
330 }
331 return "B";
332 }
333
334 inline size_t byte_size_in_exact_unit(size_t s) {
335 #ifdef _LP64
336 if (s >= G && (s % G) == 0) {
337 return s / G;
338 }
339 #endif
340 if (s >= M && (s % M) == 0) {
341 return s / M;
342 }
343 if (s >= K && (s % K) == 0) {
344 return s / K;
345 }
346 return s;
347 }
348
349 // Memory size transition formatting.
350
351 #define HEAP_CHANGE_FORMAT "%s: " SIZE_FORMAT "K(" SIZE_FORMAT "K)->" SIZE_FORMAT "K(" SIZE_FORMAT "K)"
352
353 #define HEAP_CHANGE_FORMAT_ARGS(_name_, _prev_used_, _prev_capacity_, _used_, _capacity_) \
354 (_name_), (_prev_used_) / K, (_prev_capacity_) / K, (_used_) / K, (_capacity_) / K
355
356 //----------------------------------------------------------------------------------------------------
357 // VM type definitions
358
359 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
360 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
361
362 typedef intptr_t intx;
363 typedef uintptr_t uintx;
364
365 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
366 const intx max_intx = (uintx)min_intx - 1;
367 const uintx max_uintx = (uintx)-1;
368
369 // Table of values:
370 // sizeof intx 4 8
371 // min_intx 0x80000000 0x8000000000000000
372 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
373 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
374
375 typedef unsigned int uint; NEEDS_CLEANUP
376
377
378 //----------------------------------------------------------------------------------------------------
379 // Java type definitions
380
381 // All kinds of 'plain' byte addresses
382 typedef signed char s_char;
383 typedef unsigned char u_char;
384 typedef u_char* address;
385 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
386 // except for some implementations of a C++
387 // linkage pointer to function. Should never
388 // need one of those to be placed in this
389 // type anyway.
390
391 // Utility functions to "portably" (?) bit twiddle pointers
392 // Where portable means keep ANSI C++ compilers quiet
393
394 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
395 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
396
397 // Utility functions to "portably" make cast to/from function pointers.
398
399 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
400 inline address_word castable_address(address x) { return address_word(x) ; }
401 inline address_word castable_address(void* x) { return address_word(x) ; }
402
403 // Pointer subtraction.
404 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
405 // the range we might need to find differences from one end of the heap
406 // to the other.
407 // A typical use might be:
408 // if (pointer_delta(end(), top()) >= size) {
409 // // enough room for an object of size
410 // ...
411 // and then additions like
412 // ... top() + size ...
413 // are safe because we know that top() is at least size below end().
414 inline size_t pointer_delta(const volatile void* left,
415 const volatile void* right,
416 size_t element_size) {
417 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
418 }
419
420 // A version specialized for HeapWord*'s.
421 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
422 return pointer_delta(left, right, sizeof(HeapWord));
423 }
424 // A version specialized for MetaWord*'s.
425 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
426 return pointer_delta(left, right, sizeof(MetaWord));
427 }
428
429 //
430 // ANSI C++ does not allow casting from one pointer type to a function pointer
431 // directly without at best a warning. This macro accomplishes it silently
432 // In every case that is present at this point the value be cast is a pointer
433 // to a C linkage function. In some case the type used for the cast reflects
434 // that linkage and a picky compiler would not complain. In other cases because
435 // there is no convenient place to place a typedef with extern C linkage (i.e
436 // a platform dependent header file) it doesn't. At this point no compiler seems
437 // picky enough to catch these instances (which are few). It is possible that
438 // using templates could fix these for all cases. This use of templates is likely
439 // so far from the middle of the road that it is likely to be problematic in
440 // many C++ compilers.
441 //
442 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
443 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
444
445 // Need the correct linkage to call qsort without warnings
446 extern "C" {
447 typedef int (*_sort_Fn)(const void *, const void *);
448 }
449
450 // Unsigned byte types for os and stream.hpp
451
452 // Unsigned one, two, four and eigth byte quantities used for describing
453 // the .class file format. See JVM book chapter 4.
454
455 typedef jubyte u1;
456 typedef jushort u2;
457 typedef juint u4;
458 typedef julong u8;
459
460 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
461 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
462 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
463 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
464
465 typedef jbyte s1;
466 typedef jshort s2;
467 typedef jint s4;
468 typedef jlong s8;
469
470 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
471 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
472 const jshort min_jshort = -(1 << 15); // smallest jshort
473 const jshort max_jshort = (1 << 15) - 1; // largest jshort
474
475 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
476 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
477
478 const jint min_jintFloat = (jint)(0x00000001);
479 const jfloat min_jfloat = jfloat_cast(min_jintFloat);
480 const jint max_jintFloat = (jint)(0x7f7fffff);
481 const jfloat max_jfloat = jfloat_cast(max_jintFloat);
482
483 //----------------------------------------------------------------------------------------------------
484 // JVM spec restrictions
485
486 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
487
488 //----------------------------------------------------------------------------------------------------
489 // Object alignment, in units of HeapWords.
490 //
491 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
492 // reference fields can be naturally aligned.
493
494 extern int MinObjAlignment;
495 extern int MinObjAlignmentInBytes;
496 extern int MinObjAlignmentInBytesMask;
497
498 extern int LogMinObjAlignment;
499 extern int LogMinObjAlignmentInBytes;
500
501 const int LogKlassAlignmentInBytes = 3;
502 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
503 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
504 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
505
506 // Maximal size of heap where unscaled compression can be used. Also upper bound
507 // for heap placement: 4GB.
508 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
509 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
510 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
511 extern uint64_t OopEncodingHeapMax;
512
513 // Maximal size of compressed class space. Above this limit compression is not possible.
514 // Also upper bound for placement of zero based class space. (Class space is further limited
515 // to be < 3G, see arguments.cpp.)
516 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
517
518 // Machine dependent stuff
519
520 // The maximum size of the code cache. Can be overridden by targets.
521 #define CODE_CACHE_SIZE_LIMIT (2*G)
522 // Allow targets to reduce the default size of the code cache.
523 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
524
525 #include CPU_HEADER(globalDefinitions)
526
527 // To assure the IRIW property on processors that are not multiple copy
528 // atomic, sync instructions must be issued between volatile reads to
529 // assure their ordering, instead of after volatile stores.
530 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
531 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
532 #ifdef CPU_MULTI_COPY_ATOMIC
533 // Not needed.
534 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
535 #else
536 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment.
537 // Final decision is subject to JEP 188: Java Memory Model Update.
538 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false);
539 #endif
540
541 // The expected size in bytes of a cache line, used to pad data structures.
542 #ifndef DEFAULT_CACHE_LINE_SIZE
543 #define DEFAULT_CACHE_LINE_SIZE 64
544 #endif
545
546
547 //----------------------------------------------------------------------------------------------------
548 // Utility macros for compilers
549 // used to silence compiler warnings
550
551 #define Unused_Variable(var) var
552
553
554 //----------------------------------------------------------------------------------------------------
555 // Miscellaneous
556
557 // 6302670 Eliminate Hotspot __fabsf dependency
558 // All fabs() callers should call this function instead, which will implicitly
559 // convert the operand to double, avoiding a dependency on __fabsf which
560 // doesn't exist in early versions of Solaris 8.
561 inline double fabsd(double value) {
562 return fabs(value);
563 }
564
565 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
566 // is zero, return 0.0.
567 template<typename T>
568 inline double percent_of(T numerator, T denominator) {
569 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
570 }
571
572 //----------------------------------------------------------------------------------------------------
573 // Special casts
574 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
575 typedef union {
576 jfloat f;
577 jint i;
578 } FloatIntConv;
579
580 typedef union {
581 jdouble d;
582 jlong l;
583 julong ul;
584 } DoubleLongConv;
585
586 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
587 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
588
589 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
590 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
591 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
592
593 inline jint low (jlong value) { return jint(value); }
594 inline jint high(jlong value) { return jint(value >> 32); }
595
596 // the fancy casts are a hopefully portable way
597 // to do unsigned 32 to 64 bit type conversion
598 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
599 *value |= (jlong)(julong)(juint)low; }
600
601 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
602 *value |= (jlong)high << 32; }
603
604 inline jlong jlong_from(jint h, jint l) {
605 jlong result = 0; // initialization to avoid warning
606 set_high(&result, h);
607 set_low(&result, l);
608 return result;
609 }
610
611 union jlong_accessor {
612 jint words[2];
613 jlong long_value;
614 };
615
616 void basic_types_init(); // cannot define here; uses assert
617
618
619 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
620 enum BasicType {
621 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS.
622 T_BOOLEAN = JVM_T_BOOLEAN,
623 T_CHAR = JVM_T_CHAR,
624 T_FLOAT = JVM_T_FLOAT,
625 T_DOUBLE = JVM_T_DOUBLE,
626 T_BYTE = JVM_T_BYTE,
627 T_SHORT = JVM_T_SHORT,
628 T_INT = JVM_T_INT,
629 T_LONG = JVM_T_LONG,
630 // The remaining values are not part of any standard.
631 // T_OBJECT and T_VOID denote two more semantic choices
632 // for method return values.
633 // T_OBJECT and T_ARRAY describe signature syntax.
634 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe
635 // internal references within the JVM as if they were Java
636 // types in their own right.
637 T_OBJECT = 12,
638 T_ARRAY = 13,
639 T_VOID = 14,
640 T_ADDRESS = 15,
641 T_NARROWOOP = 16,
642 T_METADATA = 17,
643 T_NARROWKLASS = 18,
644 T_CONFLICT = 19, // for stack value type with conflicting contents
645 T_ILLEGAL = 99
646 };
647
648 #define SIGNATURE_TYPES_DO(F, N) \
649 F(JVM_SIGNATURE_BOOLEAN, T_BOOLEAN, N) \
650 F(JVM_SIGNATURE_CHAR, T_CHAR, N) \
651 F(JVM_SIGNATURE_FLOAT, T_FLOAT, N) \
652 F(JVM_SIGNATURE_DOUBLE, T_DOUBLE, N) \
653 F(JVM_SIGNATURE_BYTE, T_BYTE, N) \
654 F(JVM_SIGNATURE_SHORT, T_SHORT, N) \
655 F(JVM_SIGNATURE_INT, T_INT, N) \
656 F(JVM_SIGNATURE_LONG, T_LONG, N) \
657 F(JVM_SIGNATURE_CLASS, T_OBJECT, N) \
658 F(JVM_SIGNATURE_ARRAY, T_ARRAY, N) \
659 F(JVM_SIGNATURE_VOID, T_VOID, N) \
660 /*end*/
661
662 inline bool is_java_type(BasicType t) {
663 return T_BOOLEAN <= t && t <= T_VOID;
664 }
665
666 inline bool is_java_primitive(BasicType t) {
667 return T_BOOLEAN <= t && t <= T_LONG;
668 }
669
670 inline bool is_subword_type(BasicType t) {
671 // these guys are processed exactly like T_INT in calling sequences:
672 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
673 }
674
675 inline bool is_signed_subword_type(BasicType t) {
676 return (t == T_BYTE || t == T_SHORT);
677 }
678
679 inline bool is_double_word_type(BasicType t) {
680 return (t == T_DOUBLE || t == T_LONG);
681 }
682
683 inline bool is_reference_type(BasicType t) {
684 return (t == T_OBJECT || t == T_ARRAY);
685 }
686
687 inline bool is_integral_type(BasicType t) {
688 return is_subword_type(t) || t == T_INT || t == T_LONG;
689 }
690
691 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
692 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
693 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
694 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
695 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
696 extern BasicType name2type(const char* name);
697
698 // Auxiliary math routines
699 // least common multiple
700 extern size_t lcm(size_t a, size_t b);
701
702
703 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
704 enum BasicTypeSize {
705 T_BOOLEAN_size = 1,
706 T_CHAR_size = 1,
707 T_FLOAT_size = 1,
708 T_DOUBLE_size = 2,
709 T_BYTE_size = 1,
710 T_SHORT_size = 1,
711 T_INT_size = 1,
712 T_LONG_size = 2,
713 T_OBJECT_size = 1,
714 T_ARRAY_size = 1,
715 T_NARROWOOP_size = 1,
716 T_NARROWKLASS_size = 1,
717 T_VOID_size = 0
718 };
719
720 // this works on valid parameter types but not T_VOID, T_CONFLICT, etc.
721 inline int parameter_type_word_count(BasicType t) {
722 if (is_double_word_type(t)) return 2;
723 assert(is_java_primitive(t) || is_reference_type(t), "no goofy types here please");
724 assert(type2size[t] == 1, "must be");
725 return 1;
726 }
727
728 // maps a BasicType to its instance field storage type:
729 // all sub-word integral types are widened to T_INT
730 extern BasicType type2field[T_CONFLICT+1];
731 extern BasicType type2wfield[T_CONFLICT+1];
732
733
734 // size in bytes
735 enum ArrayElementSize {
736 T_BOOLEAN_aelem_bytes = 1,
737 T_CHAR_aelem_bytes = 2,
738 T_FLOAT_aelem_bytes = 4,
739 T_DOUBLE_aelem_bytes = 8,
740 T_BYTE_aelem_bytes = 1,
741 T_SHORT_aelem_bytes = 2,
742 T_INT_aelem_bytes = 4,
743 T_LONG_aelem_bytes = 8,
744 #ifdef _LP64
745 T_OBJECT_aelem_bytes = 8,
746 T_ARRAY_aelem_bytes = 8,
747 #else
748 T_OBJECT_aelem_bytes = 4,
749 T_ARRAY_aelem_bytes = 4,
750 #endif
751 T_NARROWOOP_aelem_bytes = 4,
752 T_NARROWKLASS_aelem_bytes = 4,
753 T_VOID_aelem_bytes = 0
754 };
755
756 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
757 #ifdef ASSERT
758 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
759 #else
760 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
761 #endif
762
763
764 // JavaValue serves as a container for arbitrary Java values.
765
766 class JavaValue {
767
768 public:
769 typedef union JavaCallValue {
770 jfloat f;
771 jdouble d;
772 jint i;
773 jlong l;
774 jobject h;
775 } JavaCallValue;
776
777 private:
778 BasicType _type;
779 JavaCallValue _value;
780
781 public:
782 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
783
784 JavaValue(jfloat value) {
785 _type = T_FLOAT;
786 _value.f = value;
787 }
788
789 JavaValue(jdouble value) {
790 _type = T_DOUBLE;
791 _value.d = value;
792 }
793
794 jfloat get_jfloat() const { return _value.f; }
795 jdouble get_jdouble() const { return _value.d; }
796 jint get_jint() const { return _value.i; }
797 jlong get_jlong() const { return _value.l; }
798 jobject get_jobject() const { return _value.h; }
799 JavaCallValue* get_value_addr() { return &_value; }
800 BasicType get_type() const { return _type; }
801
802 void set_jfloat(jfloat f) { _value.f = f;}
803 void set_jdouble(jdouble d) { _value.d = d;}
804 void set_jint(jint i) { _value.i = i;}
805 void set_jlong(jlong l) { _value.l = l;}
806 void set_jobject(jobject h) { _value.h = h;}
807 void set_type(BasicType t) { _type = t; }
808
809 jboolean get_jboolean() const { return (jboolean) (_value.i);}
810 jbyte get_jbyte() const { return (jbyte) (_value.i);}
811 jchar get_jchar() const { return (jchar) (_value.i);}
812 jshort get_jshort() const { return (jshort) (_value.i);}
813
814 };
815
816
817 // TosState describes the top-of-stack state before and after the execution of
818 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
819 // registers. The TosState corresponds to the 'machine representation' of this cached
820 // value. There's 4 states corresponding to the JAVA types int, long, float & double
821 // as well as a 5th state in case the top-of-stack value is actually on the top
822 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
823 // state when it comes to machine representation but is used separately for (oop)
824 // type specific operations (e.g. verification code).
825
826 enum TosState { // describes the tos cache contents
827 btos = 0, // byte, bool tos cached
828 ztos = 1, // byte, bool tos cached
829 ctos = 2, // char tos cached
830 stos = 3, // short tos cached
831 itos = 4, // int tos cached
832 ltos = 5, // long tos cached
833 ftos = 6, // float tos cached
834 dtos = 7, // double tos cached
835 atos = 8, // object cached
836 vtos = 9, // tos not cached
837 number_of_states,
838 ilgl // illegal state: should not occur
839 };
840
841
842 inline TosState as_TosState(BasicType type) {
843 switch (type) {
844 case T_BYTE : return btos;
845 case T_BOOLEAN: return ztos;
846 case T_CHAR : return ctos;
847 case T_SHORT : return stos;
848 case T_INT : return itos;
849 case T_LONG : return ltos;
850 case T_FLOAT : return ftos;
851 case T_DOUBLE : return dtos;
852 case T_VOID : return vtos;
853 case T_ARRAY : // fall through
854 case T_OBJECT : return atos;
855 default : return ilgl;
856 }
857 }
858
859 inline BasicType as_BasicType(TosState state) {
860 switch (state) {
861 case btos : return T_BYTE;
862 case ztos : return T_BOOLEAN;
863 case ctos : return T_CHAR;
864 case stos : return T_SHORT;
865 case itos : return T_INT;
866 case ltos : return T_LONG;
867 case ftos : return T_FLOAT;
868 case dtos : return T_DOUBLE;
869 case atos : return T_OBJECT;
870 case vtos : return T_VOID;
871 default : return T_ILLEGAL;
872 }
873 }
874
875
876 // Helper function to convert BasicType info into TosState
877 // Note: Cannot define here as it uses global constant at the time being.
878 TosState as_TosState(BasicType type);
879
880
881 // JavaThreadState keeps track of which part of the code a thread is executing in. This
882 // information is needed by the safepoint code.
883 //
884 // There are 4 essential states:
885 //
886 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
887 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
888 // _thread_in_vm : Executing in the vm
889 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
890 //
891 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
892 // a transition from one state to another. These extra states makes it possible for the safepoint code to
893 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
894 //
895 // Given a state, the xxxx_trans state can always be found by adding 1.
896 //
897 enum JavaThreadState {
898 _thread_uninitialized = 0, // should never happen (missing initialization)
899 _thread_new = 2, // just starting up, i.e., in process of being initialized
900 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
901 _thread_in_native = 4, // running in native code
902 _thread_in_native_trans = 5, // corresponding transition state
903 _thread_in_vm = 6, // running in VM
904 _thread_in_vm_trans = 7, // corresponding transition state
905 _thread_in_Java = 8, // running in Java or in stub code
906 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
907 _thread_blocked = 10, // blocked in vm
908 _thread_blocked_trans = 11, // corresponding transition state
909 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
910 };
911
912 //----------------------------------------------------------------------------------------------------
913 // Special constants for debugging
914
915 const jint badInt = -3; // generic "bad int" value
916 const intptr_t badAddressVal = -2; // generic "bad address" value
917 const intptr_t badOopVal = -1; // generic "bad oop" value
918 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
919 const int badStackSegVal = 0xCA; // value used to zap stack segments
920 const int badHandleValue = 0xBC; // value used to zap vm handle area
921 const int badResourceValue = 0xAB; // value used to zap resource area
922 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
923 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
924 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
925 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
926 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
927 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
928 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
929
930
931 // (These must be implemented as #defines because C++ compilers are
932 // not obligated to inline non-integral constants!)
933 #define badAddress ((address)::badAddressVal)
934 #define badOop (cast_to_oop(::badOopVal))
935 #define badHeapWord (::badHeapWordVal)
936
937 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
938 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
939
940 //----------------------------------------------------------------------------------------------------
941 // Utility functions for bitfield manipulations
942
943 const intptr_t AllBits = ~0; // all bits set in a word
944 const intptr_t NoBits = 0; // no bits set in a word
945 const jlong NoLongBits = 0; // no bits set in a long
946 const intptr_t OneBit = 1; // only right_most bit set in a word
947
948 // get a word with the n.th or the right-most or left-most n bits set
949 // (note: #define used only so that they can be used in enum constant definitions)
950 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
951 #define right_n_bits(n) (nth_bit(n) - 1)
952 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
953
954 // bit-operations using a mask m
955 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
956 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
957 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
958 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
959 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
960
961 // bit-operations using the n.th bit
962 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
963 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
964 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
965
966 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
967 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
968 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
969 }
970
971
972 //----------------------------------------------------------------------------------------------------
973 // Utility functions for integers
974
975 // Avoid use of global min/max macros which may cause unwanted double
976 // evaluation of arguments.
977 #ifdef max
978 #undef max
979 #endif
980
981 #ifdef min
982 #undef min
983 #endif
984
985 // It is necessary to use templates here. Having normal overloaded
986 // functions does not work because it is necessary to provide both 32-
987 // and 64-bit overloaded functions, which does not work, and having
988 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
989 // will be even more error-prone than macros.
990 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
991 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
992 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
993 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
994 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
995 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
996
997 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
998
999 // Return the given value clamped to the range [min ... max]
1000 template<typename T>
1001 inline T clamp(T value, T min, T max) {
1002 assert(min <= max, "must be");
1003 return MIN2(MAX2(value, min), max);
1004 }
1005
1006 // Returns largest i such that 2^i <= x.
1007 // If x == 0, the function returns -1.
1008 inline int log2_intptr(uintptr_t x) {
1009 int i = -1;
1010 uintptr_t p = 1;
1011 while (p != 0 && p <= x) {
1012 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1013 i++; p *= 2;
1014 }
1015 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1016 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1017 return i;
1018 }
1019
1020 //* largest i such that 2^i <= x
1021 inline int log2_long(julong x) {
1022 int i = -1;
1023 julong p = 1;
1024 while (p != 0 && p <= x) {
1025 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1026 i++; p *= 2;
1027 }
1028 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1029 // (if p = 0 then overflow occurred and i = 63)
1030 return i;
1031 }
1032
1033 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1034 inline int log2_intptr(intptr_t x) {
1035 return log2_intptr((uintptr_t)x);
1036 }
1037
1038 inline int log2_int(int x) {
1039 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
1040 return log2_intptr((uintptr_t)(unsigned int)x);
1041 }
1042
1043 inline int log2_jint(jint x) {
1044 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1045 return log2_intptr((uintptr_t)(juint)x);
1046 }
1047
1048 inline int log2_uint(uint x) {
1049 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1050 return log2_intptr((uintptr_t)x);
1051 }
1052
1053 // A negative value of 'x' will return '63'
1054 inline int log2_jlong(jlong x) {
1055 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1056 return log2_long((julong)x);
1057 }
1058
1059 inline bool is_odd (intx x) { return x & 1; }
1060 inline bool is_even(intx x) { return !is_odd(x); }
1061
1062 // abs methods which cannot overflow and so are well-defined across
1063 // the entire domain of integer types.
1064 static inline unsigned int uabs(unsigned int n) {
1065 union {
1066 unsigned int result;
1067 int value;
1068 };
1069 result = n;
1070 if (value < 0) result = 0-result;
1071 return result;
1072 }
1073 static inline julong uabs(julong n) {
1074 union {
1075 julong result;
1076 jlong value;
1077 };
1078 result = n;
1079 if (value < 0) result = 0-result;
1080 return result;
1081 }
1082 static inline julong uabs(jlong n) { return uabs((julong)n); }
1083 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1084
1085 // "to" should be greater than "from."
1086 inline intx byte_size(void* from, void* to) {
1087 return (address)to - (address)from;
1088 }
1089
1090
1091 // Pack and extract shorts to/from ints:
1092
1093 inline int extract_low_short_from_int(jint x) {
1094 return x & 0xffff;
1095 }
1096
1097 inline int extract_high_short_from_int(jint x) {
1098 return (x >> 16) & 0xffff;
1099 }
1100
1101 inline int build_int_from_shorts( jushort low, jushort high ) {
1102 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1103 }
1104
1105 // Convert pointer to intptr_t, for use in printing pointers.
1106 inline intptr_t p2i(const void * p) {
1107 return (intptr_t) p;
1108 }
1109
1110 // swap a & b
1111 template<class T> static void swap(T& a, T& b) {
1112 T tmp = a;
1113 a = b;
1114 b = tmp;
1115 }
1116
1117 // array_size_impl is a function that takes a reference to T[N] and
1118 // returns a reference to char[N]. It is not ODR-used, so not defined.
1119 template<typename T, size_t N> char (&array_size_impl(T (&)[N]))[N];
1120
1121 #define ARRAY_SIZE(array) sizeof(array_size_impl(array))
1122
1123 //----------------------------------------------------------------------------------------------------
1124 // Sum and product which can never overflow: they wrap, just like the
1125 // Java operations. Note that we don't intend these to be used for
1126 // general-purpose arithmetic: their purpose is to emulate Java
1127 // operations.
1128
1129 // The goal of this code to avoid undefined or implementation-defined
1130 // behavior. The use of an lvalue to reference cast is explicitly
1131 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1132 // 15 in C++03]
1133 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1134 inline TYPE NAME (TYPE in1, TYPE in2) { \
1135 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1136 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1137 return reinterpret_cast<TYPE&>(ures); \
1138 }
1139
1140 JAVA_INTEGER_OP(+, java_add, jint, juint)
1141 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1142 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1143 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1144 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1145 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1146
1147 #undef JAVA_INTEGER_OP
1148
1149 // Provide integer shift operations with Java semantics. No overflow
1150 // issues - left shifts simply discard shifted out bits. No undefined
1151 // behavior for large or negative shift quantities; instead the actual
1152 // shift distance is the argument modulo the lhs value's size in bits.
1153 // No undefined or implementation defined behavior for shifting negative
1154 // values; left shift discards bits, right shift sign extends. We use
1155 // the same safe conversion technique as above for java_add and friends.
1156 #define JAVA_INTEGER_SHIFT_OP(OP, NAME, TYPE, XTYPE) \
1157 inline TYPE NAME (TYPE lhs, jint rhs) { \
1158 const uint rhs_mask = (sizeof(TYPE) * 8) - 1; \
1159 STATIC_ASSERT(rhs_mask == 31 || rhs_mask == 63); \
1160 XTYPE xres = static_cast<XTYPE>(lhs); \
1161 xres OP ## = (rhs & rhs_mask); \
1162 return reinterpret_cast<TYPE&>(xres); \
1163 }
1164
1165 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jint, juint)
1166 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jlong, julong)
1167 // For signed shift right, assume C++ implementation >> sign extends.
1168 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jint, jint)
1169 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jlong, jlong)
1170 // For >>> use C++ unsigned >>.
1171 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jint, juint)
1172 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jlong, julong)
1173
1174 #undef JAVA_INTEGER_SHIFT_OP
1175
1176 //----------------------------------------------------------------------------------------------------
1177 // The goal of this code is to provide saturating operations for int/uint.
1178 // Checks overflow conditions and saturates the result to min_jint/max_jint.
1179 #define SATURATED_INTEGER_OP(OP, NAME, TYPE1, TYPE2) \
1180 inline int NAME (TYPE1 in1, TYPE2 in2) { \
1181 jlong res = static_cast<jlong>(in1); \
1182 res OP ## = static_cast<jlong>(in2); \
1183 if (res > max_jint) { \
1184 res = max_jint; \
1185 } else if (res < min_jint) { \
1186 res = min_jint; \
1187 } \
1188 return static_cast<int>(res); \
1189 }
1190
1191 SATURATED_INTEGER_OP(+, saturated_add, int, int)
1192 SATURATED_INTEGER_OP(+, saturated_add, int, uint)
1193 SATURATED_INTEGER_OP(+, saturated_add, uint, int)
1194 SATURATED_INTEGER_OP(+, saturated_add, uint, uint)
1195
1196 #undef SATURATED_INTEGER_OP
1197
1198 // Dereference vptr
1199 // All C++ compilers that we know of have the vtbl pointer in the first
1200 // word. If there are exceptions, this function needs to be made compiler
1201 // specific.
1202 static inline void* dereference_vptr(const void* addr) {
1203 return *(void**)addr;
1204 }
1205
1206 //----------------------------------------------------------------------------------------------------
1207 // String type aliases used by command line flag declarations and
1208 // processing utilities.
1209
1210 typedef const char* ccstr;
1211 typedef const char* ccstrlist; // represents string arguments which accumulate
1212
1213 //----------------------------------------------------------------------------------------------------
1214 // Default hash/equals functions used by ResourceHashtable and KVHashtable
1215
1216 template<typename K> unsigned primitive_hash(const K& k) {
1217 unsigned hash = (unsigned)((uintptr_t)k);
1218 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs
1219 }
1220
1221 template<typename K> bool primitive_equals(const K& k0, const K& k1) {
1222 return k0 == k1;
1223 }
1224
1225
1226 #endif // SHARE_UTILITIES_GLOBALDEFINITIONS_HPP