1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
27
28 #include "utilities/compilerWarnings.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 #include COMPILER_HEADER(utilities/globalDefinitions)
33
34 // Defaults for macros that might be defined per compiler.
35 #ifndef NOINLINE
36 #define NOINLINE
37 #endif
38 #ifndef ALWAYSINLINE
39 #define ALWAYSINLINE inline
40 #endif
41
42 #ifndef ATTRIBUTE_ALIGNED
43 #define ATTRIBUTE_ALIGNED(x)
44 #endif
45
46 // This file holds all globally used constants & types, class (forward)
47 // declarations and a few frequently used utility functions.
48
49 // Declare the named class to be noncopyable. This macro must be used in
50 // a private part of the class's definition, followed by a semi-colon.
51 // Doing so provides private declarations for the class's copy constructor
52 // and assignment operator. Because these operations are private, most
53 // potential callers will fail to compile because they are inaccessible.
54 // The operations intentionally lack a definition, to provoke link-time
55 // failures for calls from contexts where they are accessible, e.g. from
56 // within the class or from a friend of the class.
57 // Note: The lack of definitions is still not completely bullet-proof, as
58 // an apparent call might be optimized away by copy elision.
59 // For C++11 the declarations should be changed to deleted definitions.
60 #define NONCOPYABLE(C) C(C const&); C& operator=(C const&) /* next token must be ; */
61
62 // Declare the named class to be noncopyable. This macro must be used in
63 // a private part of the class's definition, followed by a semi-colon.
64 // Doing so provides private declarations for the class's copy constructor
65 // and assignment operator. Because these operations are private, most
66 // potential callers will fail to compile because they are inaccessible.
67 // The operations intentionally lack a definition, to provoke link-time
68 // failures for calls from contexts where they are accessible, e.g. from
69 // within the class or from a friend of the class.
70 // Note: The lack of definitions is still not completely bullet-proof, as
71 // an apparent call might be optimized away by copy elision.
72 // For C++11 the declarations should be changed to deleted definitions.
73 #define NONCOPYABLE(C) C(C const&); C& operator=(C const&) /* next token must be ; */
74
75 //----------------------------------------------------------------------------------------------------
76 // Printf-style formatters for fixed- and variable-width types as pointers and
77 // integers. These are derived from the definitions in inttypes.h. If the platform
78 // doesn't provide appropriate definitions, they should be provided in
79 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
80
81 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
82
83 // Format 32-bit quantities.
84 #define INT32_FORMAT "%" PRId32
85 #define UINT32_FORMAT "%" PRIu32
86 #define INT32_FORMAT_W(width) "%" #width PRId32
87 #define UINT32_FORMAT_W(width) "%" #width PRIu32
88
89 #define PTR32_FORMAT "0x%08" PRIx32
90 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
91
92 // Format 64-bit quantities.
93 #define INT64_FORMAT "%" PRId64
94 #define UINT64_FORMAT "%" PRIu64
95 #define UINT64_FORMAT_X "%" PRIx64
96 #define INT64_FORMAT_W(width) "%" #width PRId64
97 #define UINT64_FORMAT_W(width) "%" #width PRIu64
98 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64
99
100 #define PTR64_FORMAT "0x%016" PRIx64
101
102 // Format jlong, if necessary
103 #ifndef JLONG_FORMAT
104 #define JLONG_FORMAT INT64_FORMAT
105 #endif
106 #ifndef JULONG_FORMAT
107 #define JULONG_FORMAT UINT64_FORMAT
108 #endif
109 #ifndef JULONG_FORMAT_X
110 #define JULONG_FORMAT_X UINT64_FORMAT_X
111 #endif
112
113 // Format pointers which change size between 32- and 64-bit.
114 #ifdef _LP64
115 #define INTPTR_FORMAT "0x%016" PRIxPTR
116 #define PTR_FORMAT "0x%016" PRIxPTR
117 #else // !_LP64
118 #define INTPTR_FORMAT "0x%08" PRIxPTR
119 #define PTR_FORMAT "0x%08" PRIxPTR
120 #endif // _LP64
121
122 // Format pointers without leading zeros
123 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
124
125 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
126
127 #define SSIZE_FORMAT "%" PRIdPTR
128 #define SIZE_FORMAT "%" PRIuPTR
129 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
130 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
131 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
132 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
133
134 #define INTX_FORMAT "%" PRIdPTR
135 #define UINTX_FORMAT "%" PRIuPTR
136 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
137 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
138
139 //----------------------------------------------------------------------------------------------------
140 // Constants
141
142 const int LogBytesPerShort = 1;
143 const int LogBytesPerInt = 2;
144 #ifdef _LP64
145 const int LogBytesPerWord = 3;
146 #else
147 const int LogBytesPerWord = 2;
148 #endif
149 const int LogBytesPerLong = 3;
150
151 const int BytesPerShort = 1 << LogBytesPerShort;
152 const int BytesPerInt = 1 << LogBytesPerInt;
153 const int BytesPerWord = 1 << LogBytesPerWord;
154 const int BytesPerLong = 1 << LogBytesPerLong;
155
156 const int LogBitsPerByte = 3;
157 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
158 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
159 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
160 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
161
162 const int BitsPerByte = 1 << LogBitsPerByte;
163 const int BitsPerShort = 1 << LogBitsPerShort;
164 const int BitsPerInt = 1 << LogBitsPerInt;
165 const int BitsPerWord = 1 << LogBitsPerWord;
166 const int BitsPerLong = 1 << LogBitsPerLong;
167
168 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
169 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
170
171 const int WordsPerLong = 2; // Number of stack entries for longs
172
173 const int oopSize = sizeof(char*); // Full-width oop
174 extern int heapOopSize; // Oop within a java object
175 const int wordSize = sizeof(char*);
176 const int longSize = sizeof(jlong);
177 const int jintSize = sizeof(jint);
178 const int size_tSize = sizeof(size_t);
179
180 const int BytesPerOop = BytesPerWord; // Full-width oop
181
182 extern int LogBytesPerHeapOop; // Oop within a java object
183 extern int LogBitsPerHeapOop;
184 extern int BytesPerHeapOop;
185 extern int BitsPerHeapOop;
186
187 const int BitsPerJavaInteger = 32;
188 const int BitsPerJavaLong = 64;
189 const int BitsPerSize_t = size_tSize * BitsPerByte;
190
191 // Size of a char[] needed to represent a jint as a string in decimal.
192 const int jintAsStringSize = 12;
193
194 // In fact this should be
195 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
196 // see os::set_memory_serialize_page()
197 #ifdef _LP64
198 const int SerializePageShiftCount = 4;
199 #else
200 const int SerializePageShiftCount = 3;
201 #endif
202
203 // An opaque struct of heap-word width, so that HeapWord* can be a generic
204 // pointer into the heap. We require that object sizes be measured in
205 // units of heap words, so that that
206 // HeapWord* hw;
207 // hw += oop(hw)->foo();
208 // works, where foo is a method (like size or scavenge) that returns the
209 // object size.
210 class HeapWord {
211 friend class VMStructs;
212 private:
213 char* i;
214 #ifndef PRODUCT
215 public:
216 char* value() { return i; }
217 #endif
218 };
219
220 // Analogous opaque struct for metadata allocated from
221 // metaspaces.
222 class MetaWord {
223 private:
224 char* i;
225 };
226
227 // HeapWordSize must be 2^LogHeapWordSize.
228 const int HeapWordSize = sizeof(HeapWord);
229 #ifdef _LP64
230 const int LogHeapWordSize = 3;
231 #else
232 const int LogHeapWordSize = 2;
233 #endif
234 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
235 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
236
237 // The minimum number of native machine words necessary to contain "byte_size"
238 // bytes.
239 inline size_t heap_word_size(size_t byte_size) {
240 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
241 }
242
243 //-------------------------------------------
244 // Constant for jlong (standardized by C++11)
245
246 // Build a 64bit integer constant
247 #define CONST64(x) (x ## LL)
248 #define UCONST64(x) (x ## ULL)
249
250 const jlong min_jlong = CONST64(0x8000000000000000);
251 const jlong max_jlong = CONST64(0x7fffffffffffffff);
252
253 const size_t K = 1024;
254 const size_t M = K*K;
255 const size_t G = M*K;
256 const size_t HWperKB = K / sizeof(HeapWord);
257
258 // Constants for converting from a base unit to milli-base units. For
259 // example from seconds to milliseconds and microseconds
260
261 const int MILLIUNITS = 1000; // milli units per base unit
262 const int MICROUNITS = 1000000; // micro units per base unit
263 const int NANOUNITS = 1000000000; // nano units per base unit
264
265 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
266 const jint NANOSECS_PER_MILLISEC = 1000000;
267
268 // Proper units routines try to maintain at least three significant digits.
269 // In worst case, it would print five significant digits with lower prefix.
270 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow,
271 // and therefore we need to be careful.
272
273 inline const char* proper_unit_for_byte_size(size_t s) {
274 #ifdef _LP64
275 if (s >= 100*G) {
276 return "G";
277 }
278 #endif
279 if (s >= 100*M) {
280 return "M";
281 } else if (s >= 100*K) {
282 return "K";
283 } else {
284 return "B";
285 }
286 }
287
288 template <class T>
289 inline T byte_size_in_proper_unit(T s) {
290 #ifdef _LP64
291 if (s >= 100*G) {
292 return (T)(s/G);
293 }
294 #endif
295 if (s >= 100*M) {
296 return (T)(s/M);
297 } else if (s >= 100*K) {
298 return (T)(s/K);
299 } else {
300 return s;
301 }
302 }
303
304 inline const char* exact_unit_for_byte_size(size_t s) {
305 #ifdef _LP64
306 if (s >= G && (s % G) == 0) {
307 return "G";
308 }
309 #endif
310 if (s >= M && (s % M) == 0) {
311 return "M";
312 }
313 if (s >= K && (s % K) == 0) {
314 return "K";
315 }
316 return "B";
317 }
318
319 inline size_t byte_size_in_exact_unit(size_t s) {
320 #ifdef _LP64
321 if (s >= G && (s % G) == 0) {
322 return s / G;
323 }
324 #endif
325 if (s >= M && (s % M) == 0) {
326 return s / M;
327 }
328 if (s >= K && (s % K) == 0) {
329 return s / K;
330 }
331 return s;
332 }
333
334 //----------------------------------------------------------------------------------------------------
335 // VM type definitions
336
337 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
338 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
339
340 typedef intptr_t intx;
341 typedef uintptr_t uintx;
342
343 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
344 const intx max_intx = (uintx)min_intx - 1;
345 const uintx max_uintx = (uintx)-1;
346
347 // Table of values:
348 // sizeof intx 4 8
349 // min_intx 0x80000000 0x8000000000000000
350 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
351 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
352
353 typedef unsigned int uint; NEEDS_CLEANUP
354
355
356 //----------------------------------------------------------------------------------------------------
357 // Java type definitions
358
359 // All kinds of 'plain' byte addresses
360 typedef signed char s_char;
361 typedef unsigned char u_char;
362 typedef u_char* address;
363 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
364 // except for some implementations of a C++
365 // linkage pointer to function. Should never
366 // need one of those to be placed in this
367 // type anyway.
368
369 // Utility functions to "portably" (?) bit twiddle pointers
370 // Where portable means keep ANSI C++ compilers quiet
371
372 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
373 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
374
375 // Utility functions to "portably" make cast to/from function pointers.
376
377 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
378 inline address_word castable_address(address x) { return address_word(x) ; }
379 inline address_word castable_address(void* x) { return address_word(x) ; }
380
381 // Pointer subtraction.
382 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
383 // the range we might need to find differences from one end of the heap
384 // to the other.
385 // A typical use might be:
386 // if (pointer_delta(end(), top()) >= size) {
387 // // enough room for an object of size
388 // ...
389 // and then additions like
390 // ... top() + size ...
391 // are safe because we know that top() is at least size below end().
392 inline size_t pointer_delta(const volatile void* left,
393 const volatile void* right,
394 size_t element_size) {
395 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
396 }
397
398 // A version specialized for HeapWord*'s.
399 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
400 return pointer_delta(left, right, sizeof(HeapWord));
401 }
402 // A version specialized for MetaWord*'s.
403 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
404 return pointer_delta(left, right, sizeof(MetaWord));
405 }
406
407 //
408 // ANSI C++ does not allow casting from one pointer type to a function pointer
409 // directly without at best a warning. This macro accomplishes it silently
410 // In every case that is present at this point the value be cast is a pointer
411 // to a C linkage function. In some case the type used for the cast reflects
412 // that linkage and a picky compiler would not complain. In other cases because
413 // there is no convenient place to place a typedef with extern C linkage (i.e
414 // a platform dependent header file) it doesn't. At this point no compiler seems
415 // picky enough to catch these instances (which are few). It is possible that
416 // using templates could fix these for all cases. This use of templates is likely
417 // so far from the middle of the road that it is likely to be problematic in
418 // many C++ compilers.
419 //
420 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
421 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
422
423 // Unsigned byte types for os and stream.hpp
424
425 // Unsigned one, two, four and eigth byte quantities used for describing
426 // the .class file format. See JVM book chapter 4.
427
428 typedef jubyte u1;
429 typedef jushort u2;
430 typedef juint u4;
431 typedef julong u8;
432
433 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
434 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
435 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
436 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
437
438 typedef jbyte s1;
439 typedef jshort s2;
440 typedef jint s4;
441 typedef jlong s8;
442
443 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
444 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
445 const jshort min_jshort = -(1 << 15); // smallest jshort
446 const jshort max_jshort = (1 << 15) - 1; // largest jshort
447
448 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
449 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
450
451 //----------------------------------------------------------------------------------------------------
452 // JVM spec restrictions
453
454 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
455
456 //----------------------------------------------------------------------------------------------------
457 // Default and minimum StringTableSize values
458
459 const int defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
460 const int minimumStringTableSize = 128;
461
462 const int defaultSymbolTableSize = 20011;
463 const int minimumSymbolTableSize = 1009;
464
465
466 //----------------------------------------------------------------------------------------------------
467 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
468 //
469 // Determines whether on-the-fly class replacement and frame popping are enabled.
470
471 #define HOTSWAP
472
473 //----------------------------------------------------------------------------------------------------
474 // Object alignment, in units of HeapWords.
475 //
476 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
477 // reference fields can be naturally aligned.
478
479 extern int MinObjAlignment;
480 extern int MinObjAlignmentInBytes;
481 extern int MinObjAlignmentInBytesMask;
482
483 extern int LogMinObjAlignment;
484 extern int LogMinObjAlignmentInBytes;
485
486 const int LogKlassAlignmentInBytes = 3;
487 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
488 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
489 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
490
491 // Maximal size of heap where unscaled compression can be used. Also upper bound
492 // for heap placement: 4GB.
493 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
494 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
495 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
496 extern uint64_t OopEncodingHeapMax;
497
498 // Maximal size of compressed class space. Above this limit compression is not possible.
499 // Also upper bound for placement of zero based class space. (Class space is further limited
500 // to be < 3G, see arguments.cpp.)
501 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
502
503 // Machine dependent stuff
504
505 // The maximum size of the code cache. Can be overridden by targets.
506 #define CODE_CACHE_SIZE_LIMIT (2*G)
507 // Allow targets to reduce the default size of the code cache.
508 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
509
510 #include CPU_HEADER(globalDefinitions)
511
512 // To assure the IRIW property on processors that are not multiple copy
513 // atomic, sync instructions must be issued between volatile reads to
514 // assure their ordering, instead of after volatile stores.
515 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
516 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
517 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
518 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
519 #else
520 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
521 #endif
522
523 // The expected size in bytes of a cache line, used to pad data structures.
524 #ifndef DEFAULT_CACHE_LINE_SIZE
525 #define DEFAULT_CACHE_LINE_SIZE 64
526 #endif
527
528
529 //----------------------------------------------------------------------------------------------------
530 // Utility macros for compilers
531 // used to silence compiler warnings
532
533 #define Unused_Variable(var) var
534
535
536 //----------------------------------------------------------------------------------------------------
537 // Miscellaneous
538
539 // 6302670 Eliminate Hotspot __fabsf dependency
540 // All fabs() callers should call this function instead, which will implicitly
541 // convert the operand to double, avoiding a dependency on __fabsf which
542 // doesn't exist in early versions of Solaris 8.
543 inline double fabsd(double value) {
544 return fabs(value);
545 }
546
547 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
548 // is zero, return 0.0.
549 template<typename T>
550 inline double percent_of(T numerator, T denominator) {
551 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
552 }
553
554 //----------------------------------------------------------------------------------------------------
555 // Special casts
556 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
557 typedef union {
558 jfloat f;
559 jint i;
560 } FloatIntConv;
561
562 typedef union {
563 jdouble d;
564 jlong l;
565 julong ul;
566 } DoubleLongConv;
567
568 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
569 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
570
571 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
572 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
573 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
574
575 inline jint low (jlong value) { return jint(value); }
576 inline jint high(jlong value) { return jint(value >> 32); }
577
578 // the fancy casts are a hopefully portable way
579 // to do unsigned 32 to 64 bit type conversion
580 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
581 *value |= (jlong)(julong)(juint)low; }
582
583 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
584 *value |= (jlong)high << 32; }
585
586 inline jlong jlong_from(jint h, jint l) {
587 jlong result = 0; // initialization to avoid warning
588 set_high(&result, h);
589 set_low(&result, l);
590 return result;
591 }
592
593 union jlong_accessor {
594 jint words[2];
595 jlong long_value;
596 };
597
598 void basic_types_init(); // cannot define here; uses assert
599
600
601 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
602 enum BasicType {
603 T_BOOLEAN = 4,
604 T_CHAR = 5,
605 T_FLOAT = 6,
606 T_DOUBLE = 7,
607 T_BYTE = 8,
608 T_SHORT = 9,
609 T_INT = 10,
610 T_LONG = 11,
611 T_OBJECT = 12,
612 T_ARRAY = 13,
613 T_VOID = 14,
614 T_ADDRESS = 15,
615 T_NARROWOOP = 16,
616 T_METADATA = 17,
617 T_NARROWKLASS = 18,
618 T_CONFLICT = 19, // for stack value type with conflicting contents
619 T_ILLEGAL = 99
620 };
621
622 inline bool is_java_primitive(BasicType t) {
623 return T_BOOLEAN <= t && t <= T_LONG;
624 }
625
626 inline bool is_subword_type(BasicType t) {
627 // these guys are processed exactly like T_INT in calling sequences:
628 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
629 }
630
631 inline bool is_signed_subword_type(BasicType t) {
632 return (t == T_BYTE || t == T_SHORT);
633 }
634
635 inline bool is_reference_type(BasicType t) {
636 return (t == T_OBJECT || t == T_ARRAY);
637 }
638
639 // Convert a char from a classfile signature to a BasicType
640 inline BasicType char2type(char c) {
641 switch( c ) {
642 case 'B': return T_BYTE;
643 case 'C': return T_CHAR;
644 case 'D': return T_DOUBLE;
645 case 'F': return T_FLOAT;
646 case 'I': return T_INT;
647 case 'J': return T_LONG;
648 case 'S': return T_SHORT;
649 case 'Z': return T_BOOLEAN;
650 case 'V': return T_VOID;
651 case 'L': return T_OBJECT;
652 case '[': return T_ARRAY;
653 }
654 return T_ILLEGAL;
655 }
656
657 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
658 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
659 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
660 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
661 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
662 extern BasicType name2type(const char* name);
663
664 // Auxiliary math routines
665 // least common multiple
666 extern size_t lcm(size_t a, size_t b);
667
668
669 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
670 enum BasicTypeSize {
671 T_BOOLEAN_size = 1,
672 T_CHAR_size = 1,
673 T_FLOAT_size = 1,
674 T_DOUBLE_size = 2,
675 T_BYTE_size = 1,
676 T_SHORT_size = 1,
677 T_INT_size = 1,
678 T_LONG_size = 2,
679 T_OBJECT_size = 1,
680 T_ARRAY_size = 1,
681 T_NARROWOOP_size = 1,
682 T_NARROWKLASS_size = 1,
683 T_VOID_size = 0
684 };
685
686
687 // maps a BasicType to its instance field storage type:
688 // all sub-word integral types are widened to T_INT
689 extern BasicType type2field[T_CONFLICT+1];
690 extern BasicType type2wfield[T_CONFLICT+1];
691
692
693 // size in bytes
694 enum ArrayElementSize {
695 T_BOOLEAN_aelem_bytes = 1,
696 T_CHAR_aelem_bytes = 2,
697 T_FLOAT_aelem_bytes = 4,
698 T_DOUBLE_aelem_bytes = 8,
699 T_BYTE_aelem_bytes = 1,
700 T_SHORT_aelem_bytes = 2,
701 T_INT_aelem_bytes = 4,
702 T_LONG_aelem_bytes = 8,
703 #ifdef _LP64
704 T_OBJECT_aelem_bytes = 8,
705 T_ARRAY_aelem_bytes = 8,
706 #else
707 T_OBJECT_aelem_bytes = 4,
708 T_ARRAY_aelem_bytes = 4,
709 #endif
710 T_NARROWOOP_aelem_bytes = 4,
711 T_NARROWKLASS_aelem_bytes = 4,
712 T_VOID_aelem_bytes = 0
713 };
714
715 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
716 #ifdef ASSERT
717 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
718 #else
719 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
720 #endif
721
722
723 // JavaValue serves as a container for arbitrary Java values.
724
725 class JavaValue {
726
727 public:
728 typedef union JavaCallValue {
729 jfloat f;
730 jdouble d;
731 jint i;
732 jlong l;
733 jobject h;
734 } JavaCallValue;
735
736 private:
737 BasicType _type;
738 JavaCallValue _value;
739
740 public:
741 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
742
743 JavaValue(jfloat value) {
744 _type = T_FLOAT;
745 _value.f = value;
746 }
747
748 JavaValue(jdouble value) {
749 _type = T_DOUBLE;
750 _value.d = value;
751 }
752
753 jfloat get_jfloat() const { return _value.f; }
754 jdouble get_jdouble() const { return _value.d; }
755 jint get_jint() const { return _value.i; }
756 jlong get_jlong() const { return _value.l; }
757 jobject get_jobject() const { return _value.h; }
758 JavaCallValue* get_value_addr() { return &_value; }
759 BasicType get_type() const { return _type; }
760
761 void set_jfloat(jfloat f) { _value.f = f;}
762 void set_jdouble(jdouble d) { _value.d = d;}
763 void set_jint(jint i) { _value.i = i;}
764 void set_jlong(jlong l) { _value.l = l;}
765 void set_jobject(jobject h) { _value.h = h;}
766 void set_type(BasicType t) { _type = t; }
767
768 jboolean get_jboolean() const { return (jboolean) (_value.i);}
769 jbyte get_jbyte() const { return (jbyte) (_value.i);}
770 jchar get_jchar() const { return (jchar) (_value.i);}
771 jshort get_jshort() const { return (jshort) (_value.i);}
772
773 };
774
775
776 #define STACK_BIAS 0
777 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
778 // in order to extend the reach of the stack pointer.
779 #if defined(SPARC) && defined(_LP64)
780 #undef STACK_BIAS
781 #define STACK_BIAS 0x7ff
782 #endif
783
784
785 // TosState describes the top-of-stack state before and after the execution of
786 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
787 // registers. The TosState corresponds to the 'machine representation' of this cached
788 // value. There's 4 states corresponding to the JAVA types int, long, float & double
789 // as well as a 5th state in case the top-of-stack value is actually on the top
790 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
791 // state when it comes to machine representation but is used separately for (oop)
792 // type specific operations (e.g. verification code).
793
794 enum TosState { // describes the tos cache contents
795 btos = 0, // byte, bool tos cached
796 ztos = 1, // byte, bool tos cached
797 ctos = 2, // char tos cached
798 stos = 3, // short tos cached
799 itos = 4, // int tos cached
800 ltos = 5, // long tos cached
801 ftos = 6, // float tos cached
802 dtos = 7, // double tos cached
803 atos = 8, // object cached
804 vtos = 9, // tos not cached
805 number_of_states,
806 ilgl // illegal state: should not occur
807 };
808
809
810 inline TosState as_TosState(BasicType type) {
811 switch (type) {
812 case T_BYTE : return btos;
813 case T_BOOLEAN: return ztos;
814 case T_CHAR : return ctos;
815 case T_SHORT : return stos;
816 case T_INT : return itos;
817 case T_LONG : return ltos;
818 case T_FLOAT : return ftos;
819 case T_DOUBLE : return dtos;
820 case T_VOID : return vtos;
821 case T_ARRAY : // fall through
822 case T_OBJECT : return atos;
823 default : return ilgl;
824 }
825 }
826
827 inline BasicType as_BasicType(TosState state) {
828 switch (state) {
829 case btos : return T_BYTE;
830 case ztos : return T_BOOLEAN;
831 case ctos : return T_CHAR;
832 case stos : return T_SHORT;
833 case itos : return T_INT;
834 case ltos : return T_LONG;
835 case ftos : return T_FLOAT;
836 case dtos : return T_DOUBLE;
837 case atos : return T_OBJECT;
838 case vtos : return T_VOID;
839 default : return T_ILLEGAL;
840 }
841 }
842
843
844 // Helper function to convert BasicType info into TosState
845 // Note: Cannot define here as it uses global constant at the time being.
846 TosState as_TosState(BasicType type);
847
848
849 // JavaThreadState keeps track of which part of the code a thread is executing in. This
850 // information is needed by the safepoint code.
851 //
852 // There are 4 essential states:
853 //
854 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
855 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
856 // _thread_in_vm : Executing in the vm
857 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
858 //
859 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
860 // a transition from one state to another. These extra states makes it possible for the safepoint code to
861 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
862 //
863 // Given a state, the xxxx_trans state can always be found by adding 1.
864 //
865 enum JavaThreadState {
866 _thread_uninitialized = 0, // should never happen (missing initialization)
867 _thread_new = 2, // just starting up, i.e., in process of being initialized
868 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
869 _thread_in_native = 4, // running in native code
870 _thread_in_native_trans = 5, // corresponding transition state
871 _thread_in_vm = 6, // running in VM
872 _thread_in_vm_trans = 7, // corresponding transition state
873 _thread_in_Java = 8, // running in Java or in stub code
874 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
875 _thread_blocked = 10, // blocked in vm
876 _thread_blocked_trans = 11, // corresponding transition state
877 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
878 };
879
880
881
882 //----------------------------------------------------------------------------------------------------
883 // 'Forward' declarations of frequently used classes
884 // (in order to reduce interface dependencies & reduce
885 // number of unnecessary compilations after changes)
886
887 class ClassFileStream;
888
889 class Event;
890
891 class Thread;
892 class VMThread;
893 class JavaThread;
894 class Threads;
895
896 class VM_Operation;
897 class VMOperationQueue;
898
899 class CodeBlob;
900 class CompiledMethod;
901 class nmethod;
902 class RuntimeBlob;
903 class OSRAdapter;
904 class I2CAdapter;
905 class C2IAdapter;
906 class CompiledIC;
907 class relocInfo;
908 class ScopeDesc;
909 class PcDesc;
910
911 class Recompiler;
912 class Recompilee;
913 class RecompilationPolicy;
914 class RFrame;
915 class CompiledRFrame;
916 class InterpretedRFrame;
917
918 class vframe;
919 class javaVFrame;
920 class interpretedVFrame;
921 class compiledVFrame;
922 class deoptimizedVFrame;
923 class externalVFrame;
924 class entryVFrame;
925
926 class RegisterMap;
927
928 class Mutex;
929 class Monitor;
930 class BasicLock;
931 class BasicObjectLock;
932
933 class PeriodicTask;
934
935 class JavaCallWrapper;
936
937 class oopDesc;
938 class metaDataOopDesc;
939
940 class NativeCall;
941
942 class zone;
943
944 class StubQueue;
945
946 class outputStream;
947
948 class ResourceArea;
949
950 class DebugInformationRecorder;
951 class ScopeValue;
952 class CompressedStream;
953 class DebugInfoReadStream;
954 class DebugInfoWriteStream;
955 class LocationValue;
956 class ConstantValue;
957 class IllegalValue;
958
959 class PrivilegedElement;
960 class MonitorArray;
961
962 class MonitorInfo;
963
964 class OffsetClosure;
965 class OopMapCache;
966 class InterpreterOopMap;
967 class OopMapCacheEntry;
968 class OSThread;
969
970 typedef int (*OSThreadStartFunc)(void*);
971
972 class Space;
973
974 class JavaValue;
975 class methodHandle;
976 class JavaCallArguments;
977
978 //----------------------------------------------------------------------------------------------------
979 // Special constants for debugging
980
981 const jint badInt = -3; // generic "bad int" value
982 const intptr_t badAddressVal = -2; // generic "bad address" value
983 const intptr_t badOopVal = -1; // generic "bad oop" value
984 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
985 const int badStackSegVal = 0xCA; // value used to zap stack segments
986 const int badHandleValue = 0xBC; // value used to zap vm handle area
987 const int badResourceValue = 0xAB; // value used to zap resource area
988 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
989 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
990 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
991 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
992 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
993 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
994 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
995
996
997 // (These must be implemented as #defines because C++ compilers are
998 // not obligated to inline non-integral constants!)
999 #define badAddress ((address)::badAddressVal)
1000 #define badOop (cast_to_oop(::badOopVal))
1001 #define badHeapWord (::badHeapWordVal)
1002
1003 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
1004 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
1005
1006 //----------------------------------------------------------------------------------------------------
1007 // Utility functions for bitfield manipulations
1008
1009 const intptr_t AllBits = ~0; // all bits set in a word
1010 const intptr_t NoBits = 0; // no bits set in a word
1011 const jlong NoLongBits = 0; // no bits set in a long
1012 const intptr_t OneBit = 1; // only right_most bit set in a word
1013
1014 // get a word with the n.th or the right-most or left-most n bits set
1015 // (note: #define used only so that they can be used in enum constant definitions)
1016 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
1017 #define right_n_bits(n) (nth_bit(n) - 1)
1018 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
1019
1020 // bit-operations using a mask m
1021 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
1022 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
1023 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
1024 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
1025 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
1026
1027 // bit-operations using the n.th bit
1028 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
1029 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
1030 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1031
1032 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1033 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1034 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1035 }
1036
1037
1038 //----------------------------------------------------------------------------------------------------
1039 // Utility functions for integers
1040
1041 // Avoid use of global min/max macros which may cause unwanted double
1042 // evaluation of arguments.
1043 #ifdef max
1044 #undef max
1045 #endif
1046
1047 #ifdef min
1048 #undef min
1049 #endif
1050
1051 // It is necessary to use templates here. Having normal overloaded
1052 // functions does not work because it is necessary to provide both 32-
1053 // and 64-bit overloaded functions, which does not work, and having
1054 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1055 // will be even more error-prone than macros.
1056 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1057 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1058 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1059 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1060 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1061 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1062
1063 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1064
1065 // true if x is a power of 2, false otherwise
1066 inline bool is_power_of_2(intptr_t x) {
1067 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1068 }
1069
1070 // long version of is_power_of_2
1071 inline bool is_power_of_2_long(jlong x) {
1072 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1073 }
1074
1075 // Returns largest i such that 2^i <= x.
1076 // If x == 0, the function returns -1.
1077 inline int log2_intptr(uintptr_t x) {
1078 int i = -1;
1079 uintptr_t p = 1;
1080 while (p != 0 && p <= x) {
1081 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1082 i++; p *= 2;
1083 }
1084 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1085 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1086 return i;
1087 }
1088
1089 //* largest i such that 2^i <= x
1090 inline int log2_long(julong x) {
1091 int i = -1;
1092 julong p = 1;
1093 while (p != 0 && p <= x) {
1094 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1095 i++; p *= 2;
1096 }
1097 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1098 // (if p = 0 then overflow occurred and i = 63)
1099 return i;
1100 }
1101
1102 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1103 inline int log2_intptr(intptr_t x) {
1104 return log2_intptr((uintptr_t)x);
1105 }
1106
1107 inline int log2_int(int x) {
1108 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
1109 return log2_intptr((uintptr_t)x);
1110 }
1111
1112 inline int log2_jint(jint x) {
1113 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1114 return log2_intptr((uintptr_t)x);
1115 }
1116
1117 inline int log2_uint(uint x) {
1118 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1119 return log2_intptr((uintptr_t)x);
1120 }
1121
1122 // A negative value of 'x' will return '63'
1123 inline int log2_jlong(jlong x) {
1124 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1125 return log2_long((julong)x);
1126 }
1127
1128 //* the argument must be exactly a power of 2
1129 inline int exact_log2(intptr_t x) {
1130 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1131 return log2_intptr(x);
1132 }
1133
1134 //* the argument must be exactly a power of 2
1135 inline int exact_log2_long(jlong x) {
1136 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1137 return log2_long(x);
1138 }
1139
1140 inline bool is_odd (intx x) { return x & 1; }
1141 inline bool is_even(intx x) { return !is_odd(x); }
1142
1143 // abs methods which cannot overflow and so are well-defined across
1144 // the entire domain of integer types.
1145 static inline unsigned int uabs(unsigned int n) {
1146 union {
1147 unsigned int result;
1148 int value;
1149 };
1150 result = n;
1151 if (value < 0) result = 0-result;
1152 return result;
1153 }
1154 static inline julong uabs(julong n) {
1155 union {
1156 julong result;
1157 jlong value;
1158 };
1159 result = n;
1160 if (value < 0) result = 0-result;
1161 return result;
1162 }
1163 static inline julong uabs(jlong n) { return uabs((julong)n); }
1164 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1165
1166 // "to" should be greater than "from."
1167 inline intx byte_size(void* from, void* to) {
1168 return (address)to - (address)from;
1169 }
1170
1171 // Provide integer shift operations with Java semantics. No overflow
1172 // issues - left shifts simply discard shifted out bits. No undefined
1173 // behavior for large or negative shift quantities; instead the actual
1174 // shift distance is the argument modulo the lhs value's size in bits.
1175 // No undefined or implementation defined behavior for shifting negative
1176 // values; left shift discards bits, right shift sign extends. We use
1177 // the same safe conversion technique as above for java_add and friends.
1178 #define JAVA_INTEGER_SHIFT_OP(OP, NAME, TYPE, XTYPE) \
1179 inline TYPE NAME (TYPE lhs, jint rhs) { \
1180 const uint rhs_mask = (sizeof(TYPE) * 8) - 1; \
1181 STATIC_ASSERT(rhs_mask == 31 || rhs_mask == 63); \
1182 XTYPE xres = static_cast<XTYPE>(lhs); \
1183 xres OP ## = (rhs & rhs_mask); \
1184 return reinterpret_cast<TYPE&>(xres); \
1185 }
1186
1187 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jint, juint)
1188 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jlong, julong)
1189 // For signed shift right, assume C++ implementation >> sign extends.
1190 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jint, jint)
1191 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jlong, jlong)
1192 // For >>> use C++ unsigned >>.
1193 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jint, juint)
1194 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jlong, julong)
1195
1196 #undef JAVA_INTEGER_SHIFT_OP
1197
1198 //----------------------------------------------------------------------------------------------------
1199 // Avoid non-portable casts with these routines (DEPRECATED)
1200
1201 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1202 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1203
1204 // Given sequence of four bytes, build into a 32-bit word
1205 // following the conventions used in class files.
1206 // On the 386, this could be realized with a simple address cast.
1207 //
1208
1209 // This routine takes eight bytes:
1210 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1211 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1212 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1213 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1214 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1215 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1216 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1217 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1218 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1219 }
1220
1221 // This routine takes four bytes:
1222 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1223 return (( u4(c1) << 24 ) & 0xff000000)
1224 | (( u4(c2) << 16 ) & 0x00ff0000)
1225 | (( u4(c3) << 8 ) & 0x0000ff00)
1226 | (( u4(c4) << 0 ) & 0x000000ff);
1227 }
1228
1229 // And this one works if the four bytes are contiguous in memory:
1230 inline u4 build_u4_from( u1* p ) {
1231 return build_u4_from( p[0], p[1], p[2], p[3] );
1232 }
1233
1234 // Ditto for two-byte ints:
1235 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1236 return u2((( u2(c1) << 8 ) & 0xff00)
1237 | (( u2(c2) << 0 ) & 0x00ff));
1238 }
1239
1240 // And this one works if the two bytes are contiguous in memory:
1241 inline u2 build_u2_from( u1* p ) {
1242 return build_u2_from( p[0], p[1] );
1243 }
1244
1245 // Ditto for floats:
1246 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1247 u4 u = build_u4_from( c1, c2, c3, c4 );
1248 return *(jfloat*)&u;
1249 }
1250
1251 inline jfloat build_float_from( u1* p ) {
1252 u4 u = build_u4_from( p );
1253 return *(jfloat*)&u;
1254 }
1255
1256
1257 // now (64-bit) longs
1258
1259 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1260 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1261 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1262 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1263 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1264 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1265 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1266 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1267 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1268 }
1269
1270 inline jlong build_long_from( u1* p ) {
1271 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1272 }
1273
1274
1275 // Doubles, too!
1276 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1277 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1278 return *(jdouble*)&u;
1279 }
1280
1281 inline jdouble build_double_from( u1* p ) {
1282 jlong u = build_long_from( p );
1283 return *(jdouble*)&u;
1284 }
1285
1286
1287 // Portable routines to go the other way:
1288
1289 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1290 c1 = u1(x >> 8);
1291 c2 = u1(x);
1292 }
1293
1294 inline void explode_short_to( u2 x, u1* p ) {
1295 explode_short_to( x, p[0], p[1]);
1296 }
1297
1298 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1299 c1 = u1(x >> 24);
1300 c2 = u1(x >> 16);
1301 c3 = u1(x >> 8);
1302 c4 = u1(x);
1303 }
1304
1305 inline void explode_int_to( u4 x, u1* p ) {
1306 explode_int_to( x, p[0], p[1], p[2], p[3]);
1307 }
1308
1309
1310 // Pack and extract shorts to/from ints:
1311
1312 inline int extract_low_short_from_int(jint x) {
1313 return x & 0xffff;
1314 }
1315
1316 inline int extract_high_short_from_int(jint x) {
1317 return (x >> 16) & 0xffff;
1318 }
1319
1320 inline int build_int_from_shorts( jushort low, jushort high ) {
1321 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1322 }
1323
1324 // Convert pointer to intptr_t, for use in printing pointers.
1325 inline intptr_t p2i(const void * p) {
1326 return (intptr_t) p;
1327 }
1328
1329 // swap a & b
1330 template<class T> static void swap(T& a, T& b) {
1331 T tmp = a;
1332 a = b;
1333 b = tmp;
1334 }
1335
1336 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1337
1338 //----------------------------------------------------------------------------------------------------
1339 // Sum and product which can never overflow: they wrap, just like the
1340 // Java operations. Note that we don't intend these to be used for
1341 // general-purpose arithmetic: their purpose is to emulate Java
1342 // operations.
1343
1344 // The goal of this code to avoid undefined or implementation-defined
1345 // behavior. The use of an lvalue to reference cast is explicitly
1346 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1347 // 15 in C++03]
1348 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1349 inline TYPE NAME (TYPE in1, TYPE in2) { \
1350 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1351 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1352 return reinterpret_cast<TYPE&>(ures); \
1353 }
1354
1355 JAVA_INTEGER_OP(+, java_add, jint, juint)
1356 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1357 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1358 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1359 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1360 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1361
1362 #undef JAVA_INTEGER_OP
1363
1364 // Dereference vptr
1365 // All C++ compilers that we know of have the vtbl pointer in the first
1366 // word. If there are exceptions, this function needs to be made compiler
1367 // specific.
1368 static inline void* dereference_vptr(const void* addr) {
1369 return *(void**)addr;
1370 }
1371
1372 //----------------------------------------------------------------------------------------------------
1373 // String type aliases used by command line flag declarations and
1374 // processing utilities.
1375
1376 typedef const char* ccstr;
1377 typedef const char* ccstrlist; // represents string arguments which accumulate
1378
1379 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP