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 //------------------------------------------- 237 // Constant for jlong (standardized by C++11) 238 239 // Build a 64bit integer constant 240 #define CONST64(x) (x ## LL) 241 #define UCONST64(x) (x ## ULL) 242 243 const jlong min_jlong = CONST64(0x8000000000000000); 244 const jlong max_jlong = CONST64(0x7fffffffffffffff); 245 246 const size_t K = 1024; 247 const size_t M = K*K; 248 const size_t G = M*K; 249 const size_t HWperKB = K / sizeof(HeapWord); 250 251 // Constants for converting from a base unit to milli-base units. For 252 // example from seconds to milliseconds and microseconds 253 254 const int MILLIUNITS = 1000; // milli units per base unit 255 const int MICROUNITS = 1000000; // micro units per base unit 256 const int NANOUNITS = 1000000000; // nano units per base unit 257 const int NANOUNITS_PER_MILLIUNIT = NANOUNITS / MILLIUNITS; 258 259 const jlong NANOSECS_PER_SEC = CONST64(1000000000); 260 const jint NANOSECS_PER_MILLISEC = 1000000; 261 262 263 // Unit conversion functions 264 // The caller is responsible for considering overlow. 265 266 inline int64_t nanos_to_millis(int64_t nanos) { 267 return nanos / NANOUNITS_PER_MILLIUNIT; 268 } 269 inline int64_t millis_to_nanos(int64_t millis) { 270 return millis * NANOUNITS_PER_MILLIUNIT; 271 } 272 273 // Proper units routines try to maintain at least three significant digits. 274 // In worst case, it would print five significant digits with lower prefix. 275 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow, 276 // and therefore we need to be careful. 277 278 inline const char* proper_unit_for_byte_size(size_t s) { 279 #ifdef _LP64 280 if (s >= 100*G) { 281 return "G"; 282 } 283 #endif 284 if (s >= 100*M) { 285 return "M"; 286 } else if (s >= 100*K) { 287 return "K"; 288 } else { 289 return "B"; 290 } 291 } 292 293 template <class T> 294 inline T byte_size_in_proper_unit(T s) { 295 #ifdef _LP64 296 if (s >= 100*G) { 297 return (T)(s/G); 298 } 299 #endif 300 if (s >= 100*M) { 301 return (T)(s/M); 302 } else if (s >= 100*K) { 303 return (T)(s/K); 304 } else { 305 return s; 306 } 307 } 308 309 inline const char* exact_unit_for_byte_size(size_t s) { 310 #ifdef _LP64 311 if (s >= G && (s % G) == 0) { 312 return "G"; 313 } 314 #endif 315 if (s >= M && (s % M) == 0) { 316 return "M"; 317 } 318 if (s >= K && (s % K) == 0) { 319 return "K"; 320 } 321 return "B"; 322 } 323 324 inline size_t byte_size_in_exact_unit(size_t s) { 325 #ifdef _LP64 326 if (s >= G && (s % G) == 0) { 327 return s / G; 328 } 329 #endif 330 if (s >= M && (s % M) == 0) { 331 return s / M; 332 } 333 if (s >= K && (s % K) == 0) { 334 return s / K; 335 } 336 return s; 337 } 338 339 // Memory size transition formatting. 340 341 #define HEAP_CHANGE_FORMAT "%s: " SIZE_FORMAT "K(" SIZE_FORMAT "K)->" SIZE_FORMAT "K(" SIZE_FORMAT "K)" 342 343 #define HEAP_CHANGE_FORMAT_ARGS(_name_, _prev_used_, _prev_capacity_, _used_, _capacity_) \ 344 (_name_), (_prev_used_) / K, (_prev_capacity_) / K, (_used_) / K, (_capacity_) / K 345 346 //---------------------------------------------------------------------------------------------------- 347 // VM type definitions 348 349 // intx and uintx are the 'extended' int and 'extended' unsigned int types; 350 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 351 352 typedef intptr_t intx; 353 typedef uintptr_t uintx; 354 355 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 356 const intx max_intx = (uintx)min_intx - 1; 357 const uintx max_uintx = (uintx)-1; 358 359 // Table of values: 360 // sizeof intx 4 8 361 // min_intx 0x80000000 0x8000000000000000 362 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 363 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 364 365 typedef unsigned int uint; NEEDS_CLEANUP 366 367 368 //---------------------------------------------------------------------------------------------------- 369 // Java type definitions 370 371 // All kinds of 'plain' byte addresses 372 typedef signed char s_char; 373 typedef unsigned char u_char; 374 typedef u_char* address; 375 typedef uintptr_t address_word; // unsigned integer which will hold a pointer 376 // except for some implementations of a C++ 377 // linkage pointer to function. Should never 378 // need one of those to be placed in this 379 // type anyway. 380 381 // Utility functions to "portably" (?) bit twiddle pointers 382 // Where portable means keep ANSI C++ compilers quiet 383 384 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 385 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 386 387 // Utility functions to "portably" make cast to/from function pointers. 388 389 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 390 inline address_word castable_address(address x) { return address_word(x) ; } 391 inline address_word castable_address(void* x) { return address_word(x) ; } 392 393 // Pointer subtraction. 394 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 395 // the range we might need to find differences from one end of the heap 396 // to the other. 397 // A typical use might be: 398 // if (pointer_delta(end(), top()) >= size) { 399 // // enough room for an object of size 400 // ... 401 // and then additions like 402 // ... top() + size ... 403 // are safe because we know that top() is at least size below end(). 404 inline size_t pointer_delta(const volatile void* left, 405 const volatile void* right, 406 size_t element_size) { 407 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 408 } 409 410 // A version specialized for HeapWord*'s. 411 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 412 return pointer_delta(left, right, sizeof(HeapWord)); 413 } 414 // A version specialized for MetaWord*'s. 415 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 416 return pointer_delta(left, right, sizeof(MetaWord)); 417 } 418 419 // 420 // ANSI C++ does not allow casting from one pointer type to a function pointer 421 // directly without at best a warning. This macro accomplishes it silently 422 // In every case that is present at this point the value be cast is a pointer 423 // to a C linkage function. In some case the type used for the cast reflects 424 // that linkage and a picky compiler would not complain. In other cases because 425 // there is no convenient place to place a typedef with extern C linkage (i.e 426 // a platform dependent header file) it doesn't. At this point no compiler seems 427 // picky enough to catch these instances (which are few). It is possible that 428 // using templates could fix these for all cases. This use of templates is likely 429 // so far from the middle of the road that it is likely to be problematic in 430 // many C++ compilers. 431 // 432 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 433 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 434 435 // Unsigned byte types for os and stream.hpp 436 437 // Unsigned one, two, four and eigth byte quantities used for describing 438 // the .class file format. See JVM book chapter 4. 439 440 typedef jubyte u1; 441 typedef jushort u2; 442 typedef juint u4; 443 typedef julong u8; 444 445 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 446 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 447 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 448 const julong max_julong = (julong)-1; // 0xFF....FF largest julong 449 450 typedef jbyte s1; 451 typedef jshort s2; 452 typedef jint s4; 453 typedef jlong s8; 454 455 const jbyte min_jbyte = -(1 << 7); // smallest jbyte 456 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 457 const jshort min_jshort = -(1 << 15); // smallest jshort 458 const jshort max_jshort = (1 << 15) - 1; // largest jshort 459 460 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 461 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 462 463 //---------------------------------------------------------------------------------------------------- 464 // JVM spec restrictions 465 466 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 467 468 //---------------------------------------------------------------------------------------------------- 469 // Object alignment, in units of HeapWords. 470 // 471 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 472 // reference fields can be naturally aligned. 473 474 extern int MinObjAlignment; 475 extern int MinObjAlignmentInBytes; 476 extern int MinObjAlignmentInBytesMask; 477 478 extern int LogMinObjAlignment; 479 extern int LogMinObjAlignmentInBytes; 480 481 const int LogKlassAlignmentInBytes = 3; 482 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 483 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 484 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 485 486 // Maximal size of heap where unscaled compression can be used. Also upper bound 487 // for heap placement: 4GB. 488 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 489 // Maximal size of heap where compressed oops can be used. Also upper bound for heap 490 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 491 extern uint64_t OopEncodingHeapMax; 492 493 // Maximal size of compressed class space. Above this limit compression is not possible. 494 // Also upper bound for placement of zero based class space. (Class space is further limited 495 // to be < 3G, see arguments.cpp.) 496 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 497 498 // Machine dependent stuff 499 500 // The maximum size of the code cache. Can be overridden by targets. 501 #define CODE_CACHE_SIZE_LIMIT (2*G) 502 // Allow targets to reduce the default size of the code cache. 503 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 504 505 #include CPU_HEADER(globalDefinitions) 506 507 // To assure the IRIW property on processors that are not multiple copy 508 // atomic, sync instructions must be issued between volatile reads to 509 // assure their ordering, instead of after volatile stores. 510 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 511 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 512 #ifdef CPU_MULTI_COPY_ATOMIC 513 // Not needed. 514 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 515 #else 516 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment. 517 // Final decision is subject to JEP 188: Java Memory Model Update. 518 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false); 519 #endif 520 521 // The expected size in bytes of a cache line, used to pad data structures. 522 #ifndef DEFAULT_CACHE_LINE_SIZE 523 #define DEFAULT_CACHE_LINE_SIZE 64 524 #endif 525 526 527 //---------------------------------------------------------------------------------------------------- 528 // Utility macros for compilers 529 // used to silence compiler warnings 530 531 #define Unused_Variable(var) var 532 533 534 //---------------------------------------------------------------------------------------------------- 535 // Miscellaneous 536 537 // 6302670 Eliminate Hotspot __fabsf dependency 538 // All fabs() callers should call this function instead, which will implicitly 539 // convert the operand to double, avoiding a dependency on __fabsf which 540 // doesn't exist in early versions of Solaris 8. 541 inline double fabsd(double value) { 542 return fabs(value); 543 } 544 545 // Returns numerator/denominator as percentage value from 0 to 100. If denominator 546 // is zero, return 0.0. 547 template<typename T> 548 inline double percent_of(T numerator, T denominator) { 549 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 550 } 551 552 //---------------------------------------------------------------------------------------------------- 553 // Special casts 554 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern 555 typedef union { 556 jfloat f; 557 jint i; 558 } FloatIntConv; 559 560 typedef union { 561 jdouble d; 562 jlong l; 563 julong ul; 564 } DoubleLongConv; 565 566 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 567 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 568 569 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 570 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 571 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 572 573 inline jint low (jlong value) { return jint(value); } 574 inline jint high(jlong value) { return jint(value >> 32); } 575 576 // the fancy casts are a hopefully portable way 577 // to do unsigned 32 to 64 bit type conversion 578 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 579 *value |= (jlong)(julong)(juint)low; } 580 581 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 582 *value |= (jlong)high << 32; } 583 584 inline jlong jlong_from(jint h, jint l) { 585 jlong result = 0; // initialization to avoid warning 586 set_high(&result, h); 587 set_low(&result, l); 588 return result; 589 } 590 591 union jlong_accessor { 592 jint words[2]; 593 jlong long_value; 594 }; 595 596 void basic_types_init(); // cannot define here; uses assert 597 598 599 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 600 enum BasicType { 601 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS. 602 T_BOOLEAN = JVM_T_BOOLEAN, 603 T_CHAR = JVM_T_CHAR, 604 T_FLOAT = JVM_T_FLOAT, 605 T_DOUBLE = JVM_T_DOUBLE, 606 T_BYTE = JVM_T_BYTE, 607 T_SHORT = JVM_T_SHORT, 608 T_INT = JVM_T_INT, 609 T_LONG = JVM_T_LONG, 610 // The remaining values are not part of any standard. 611 // T_OBJECT and T_VOID denote two more semantic choices 612 // for method return values. 613 // T_OBJECT and T_ARRAY describe signature syntax. 614 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe 615 // internal references within the JVM as if they were Java 616 // types in their own right. 617 T_OBJECT = 12, 618 T_ARRAY = 13, 619 T_VOID = 14, 620 T_ADDRESS = 15, 621 T_NARROWOOP = 16, 622 T_METADATA = 17, 623 T_NARROWKLASS = 18, 624 T_CONFLICT = 19, // for stack value type with conflicting contents 625 T_ILLEGAL = 99 626 }; 627 628 #define SIGNATURE_TYPES_DO(F, N) \ 629 F(JVM_SIGNATURE_BOOLEAN, T_BOOLEAN, N) \ 630 F(JVM_SIGNATURE_CHAR, T_CHAR, N) \ 631 F(JVM_SIGNATURE_FLOAT, T_FLOAT, N) \ 632 F(JVM_SIGNATURE_DOUBLE, T_DOUBLE, N) \ 633 F(JVM_SIGNATURE_BYTE, T_BYTE, N) \ 634 F(JVM_SIGNATURE_SHORT, T_SHORT, N) \ 635 F(JVM_SIGNATURE_INT, T_INT, N) \ 636 F(JVM_SIGNATURE_LONG, T_LONG, N) \ 637 F(JVM_SIGNATURE_CLASS, T_OBJECT, N) \ 638 F(JVM_SIGNATURE_ARRAY, T_ARRAY, N) \ 639 F(JVM_SIGNATURE_VOID, T_VOID, N) \ 640 /*end*/ 641 642 inline bool is_java_type(BasicType t) { 643 return T_BOOLEAN <= t && t <= T_VOID; 644 } 645 646 inline bool is_java_primitive(BasicType t) { 647 return T_BOOLEAN <= t && t <= T_LONG; 648 } 649 650 inline bool is_subword_type(BasicType t) { 651 // these guys are processed exactly like T_INT in calling sequences: 652 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 653 } 654 655 inline bool is_signed_subword_type(BasicType t) { 656 return (t == T_BYTE || t == T_SHORT); 657 } 658 659 inline bool is_double_word_type(BasicType t) { 660 return (t == T_DOUBLE || t == T_LONG); 661 } 662 663 inline bool is_reference_type(BasicType t) { 664 return (t == T_OBJECT || t == T_ARRAY); 665 } 666 667 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 668 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 669 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 670 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 671 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 672 extern BasicType name2type(const char* name); 673 674 // Auxiliary math routines 675 // least common multiple 676 extern size_t lcm(size_t a, size_t b); 677 678 679 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 680 enum BasicTypeSize { 681 T_BOOLEAN_size = 1, 682 T_CHAR_size = 1, 683 T_FLOAT_size = 1, 684 T_DOUBLE_size = 2, 685 T_BYTE_size = 1, 686 T_SHORT_size = 1, 687 T_INT_size = 1, 688 T_LONG_size = 2, 689 T_OBJECT_size = 1, 690 T_ARRAY_size = 1, 691 T_NARROWOOP_size = 1, 692 T_NARROWKLASS_size = 1, 693 T_VOID_size = 0 694 }; 695 696 // this works on valid parameter types but not T_VOID, T_CONFLICT, etc. 697 inline int parameter_type_word_count(BasicType t) { 698 if (is_double_word_type(t)) return 2; 699 assert(is_java_primitive(t) || is_reference_type(t), "no goofy types here please"); 700 assert(type2size[t] == 1, "must be"); 701 return 1; 702 } 703 704 // maps a BasicType to its instance field storage type: 705 // all sub-word integral types are widened to T_INT 706 extern BasicType type2field[T_CONFLICT+1]; 707 extern BasicType type2wfield[T_CONFLICT+1]; 708 709 710 // size in bytes 711 enum ArrayElementSize { 712 T_BOOLEAN_aelem_bytes = 1, 713 T_CHAR_aelem_bytes = 2, 714 T_FLOAT_aelem_bytes = 4, 715 T_DOUBLE_aelem_bytes = 8, 716 T_BYTE_aelem_bytes = 1, 717 T_SHORT_aelem_bytes = 2, 718 T_INT_aelem_bytes = 4, 719 T_LONG_aelem_bytes = 8, 720 #ifdef _LP64 721 T_OBJECT_aelem_bytes = 8, 722 T_ARRAY_aelem_bytes = 8, 723 #else 724 T_OBJECT_aelem_bytes = 4, 725 T_ARRAY_aelem_bytes = 4, 726 #endif 727 T_NARROWOOP_aelem_bytes = 4, 728 T_NARROWKLASS_aelem_bytes = 4, 729 T_VOID_aelem_bytes = 0 730 }; 731 732 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 733 #ifdef ASSERT 734 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 735 #else 736 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 737 #endif 738 739 740 // JavaValue serves as a container for arbitrary Java values. 741 742 class JavaValue { 743 744 public: 745 typedef union JavaCallValue { 746 jfloat f; 747 jdouble d; 748 jint i; 749 jlong l; 750 jobject h; 751 } JavaCallValue; 752 753 private: 754 BasicType _type; 755 JavaCallValue _value; 756 757 public: 758 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 759 760 JavaValue(jfloat value) { 761 _type = T_FLOAT; 762 _value.f = value; 763 } 764 765 JavaValue(jdouble value) { 766 _type = T_DOUBLE; 767 _value.d = value; 768 } 769 770 jfloat get_jfloat() const { return _value.f; } 771 jdouble get_jdouble() const { return _value.d; } 772 jint get_jint() const { return _value.i; } 773 jlong get_jlong() const { return _value.l; } 774 jobject get_jobject() const { return _value.h; } 775 JavaCallValue* get_value_addr() { return &_value; } 776 BasicType get_type() const { return _type; } 777 778 void set_jfloat(jfloat f) { _value.f = f;} 779 void set_jdouble(jdouble d) { _value.d = d;} 780 void set_jint(jint i) { _value.i = i;} 781 void set_jlong(jlong l) { _value.l = l;} 782 void set_jobject(jobject h) { _value.h = h;} 783 void set_type(BasicType t) { _type = t; } 784 785 jboolean get_jboolean() const { return (jboolean) (_value.i);} 786 jbyte get_jbyte() const { return (jbyte) (_value.i);} 787 jchar get_jchar() const { return (jchar) (_value.i);} 788 jshort get_jshort() const { return (jshort) (_value.i);} 789 790 }; 791 792 793 #define STACK_BIAS 0 794 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 795 // in order to extend the reach of the stack pointer. 796 #if defined(SPARC) && defined(_LP64) 797 #undef STACK_BIAS 798 #define STACK_BIAS 0x7ff 799 #endif 800 801 802 // TosState describes the top-of-stack state before and after the execution of 803 // a bytecode or method. The top-of-stack value may be cached in one or more CPU 804 // registers. The TosState corresponds to the 'machine representation' of this cached 805 // value. There's 4 states corresponding to the JAVA types int, long, float & double 806 // as well as a 5th state in case the top-of-stack value is actually on the top 807 // of stack (in memory) and thus not cached. The atos state corresponds to the itos 808 // state when it comes to machine representation but is used separately for (oop) 809 // type specific operations (e.g. verification code). 810 811 enum TosState { // describes the tos cache contents 812 btos = 0, // byte, bool tos cached 813 ztos = 1, // byte, bool tos cached 814 ctos = 2, // char tos cached 815 stos = 3, // short tos cached 816 itos = 4, // int tos cached 817 ltos = 5, // long tos cached 818 ftos = 6, // float tos cached 819 dtos = 7, // double tos cached 820 atos = 8, // object cached 821 vtos = 9, // tos not cached 822 number_of_states, 823 ilgl // illegal state: should not occur 824 }; 825 826 827 inline TosState as_TosState(BasicType type) { 828 switch (type) { 829 case T_BYTE : return btos; 830 case T_BOOLEAN: return ztos; 831 case T_CHAR : return ctos; 832 case T_SHORT : return stos; 833 case T_INT : return itos; 834 case T_LONG : return ltos; 835 case T_FLOAT : return ftos; 836 case T_DOUBLE : return dtos; 837 case T_VOID : return vtos; 838 case T_ARRAY : // fall through 839 case T_OBJECT : return atos; 840 default : return ilgl; 841 } 842 } 843 844 inline BasicType as_BasicType(TosState state) { 845 switch (state) { 846 case btos : return T_BYTE; 847 case ztos : return T_BOOLEAN; 848 case ctos : return T_CHAR; 849 case stos : return T_SHORT; 850 case itos : return T_INT; 851 case ltos : return T_LONG; 852 case ftos : return T_FLOAT; 853 case dtos : return T_DOUBLE; 854 case atos : return T_OBJECT; 855 case vtos : return T_VOID; 856 default : return T_ILLEGAL; 857 } 858 } 859 860 861 // Helper function to convert BasicType info into TosState 862 // Note: Cannot define here as it uses global constant at the time being. 863 TosState as_TosState(BasicType type); 864 865 866 // JavaThreadState keeps track of which part of the code a thread is executing in. This 867 // information is needed by the safepoint code. 868 // 869 // There are 4 essential states: 870 // 871 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 872 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 873 // _thread_in_vm : Executing in the vm 874 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 875 // 876 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 877 // a transition from one state to another. These extra states makes it possible for the safepoint code to 878 // handle certain thread_states without having to suspend the thread - making the safepoint code faster. 879 // 880 // Given a state, the xxxx_trans state can always be found by adding 1. 881 // 882 enum JavaThreadState { 883 _thread_uninitialized = 0, // should never happen (missing initialization) 884 _thread_new = 2, // just starting up, i.e., in process of being initialized 885 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 886 _thread_in_native = 4, // running in native code 887 _thread_in_native_trans = 5, // corresponding transition state 888 _thread_in_vm = 6, // running in VM 889 _thread_in_vm_trans = 7, // corresponding transition state 890 _thread_in_Java = 8, // running in Java or in stub code 891 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 892 _thread_blocked = 10, // blocked in vm 893 _thread_blocked_trans = 11, // corresponding transition state 894 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 895 }; 896 897 //---------------------------------------------------------------------------------------------------- 898 // Special constants for debugging 899 900 const jint badInt = -3; // generic "bad int" value 901 const intptr_t badAddressVal = -2; // generic "bad address" value 902 const intptr_t badOopVal = -1; // generic "bad oop" value 903 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 904 const int badStackSegVal = 0xCA; // value used to zap stack segments 905 const int badHandleValue = 0xBC; // value used to zap vm handle area 906 const int badResourceValue = 0xAB; // value used to zap resource area 907 const int freeBlockPad = 0xBA; // value used to pad freed blocks. 908 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 909 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 910 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 911 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 912 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 913 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 914 915 916 // (These must be implemented as #defines because C++ compilers are 917 // not obligated to inline non-integral constants!) 918 #define badAddress ((address)::badAddressVal) 919 #define badOop (cast_to_oop(::badOopVal)) 920 #define badHeapWord (::badHeapWordVal) 921 922 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 923 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 924 925 //---------------------------------------------------------------------------------------------------- 926 // Utility functions for bitfield manipulations 927 928 const intptr_t AllBits = ~0; // all bits set in a word 929 const intptr_t NoBits = 0; // no bits set in a word 930 const jlong NoLongBits = 0; // no bits set in a long 931 const intptr_t OneBit = 1; // only right_most bit set in a word 932 933 // get a word with the n.th or the right-most or left-most n bits set 934 // (note: #define used only so that they can be used in enum constant definitions) 935 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 936 #define right_n_bits(n) (nth_bit(n) - 1) 937 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 938 939 // bit-operations using a mask m 940 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 941 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 942 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 943 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 944 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 945 946 // bit-operations using the n.th bit 947 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 948 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 949 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 950 951 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 952 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 953 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 954 } 955 956 957 //---------------------------------------------------------------------------------------------------- 958 // Utility functions for integers 959 960 // Avoid use of global min/max macros which may cause unwanted double 961 // evaluation of arguments. 962 #ifdef max 963 #undef max 964 #endif 965 966 #ifdef min 967 #undef min 968 #endif 969 970 // It is necessary to use templates here. Having normal overloaded 971 // functions does not work because it is necessary to provide both 32- 972 // and 64-bit overloaded functions, which does not work, and having 973 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 974 // will be even more error-prone than macros. 975 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 976 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 977 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 978 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 979 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 980 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 981 982 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 983 984 // Return the given value clamped to the range [min ... max] 985 template<typename T> 986 inline T clamp(T value, T min, T max) { 987 assert(min <= max, "must be"); 988 return MIN2(MAX2(value, min), max); 989 } 990 991 // Returns largest i such that 2^i <= x. 992 // If x == 0, the function returns -1. 993 inline int log2_intptr(uintptr_t x) { 994 int i = -1; 995 uintptr_t p = 1; 996 while (p != 0 && p <= x) { 997 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 998 i++; p *= 2; 999 } 1000 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1001 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 1002 return i; 1003 } 1004 1005 //* largest i such that 2^i <= x 1006 inline int log2_long(julong x) { 1007 int i = -1; 1008 julong p = 1; 1009 while (p != 0 && p <= x) { 1010 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1011 i++; p *= 2; 1012 } 1013 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1014 // (if p = 0 then overflow occurred and i = 63) 1015 return i; 1016 } 1017 1018 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 1019 inline int log2_intptr(intptr_t x) { 1020 return log2_intptr((uintptr_t)x); 1021 } 1022 1023 inline int log2_int(int x) { 1024 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t)); 1025 return log2_intptr((uintptr_t)(unsigned int)x); 1026 } 1027 1028 inline int log2_jint(jint x) { 1029 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t)); 1030 return log2_intptr((uintptr_t)(juint)x); 1031 } 1032 1033 inline int log2_uint(uint x) { 1034 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t)); 1035 return log2_intptr((uintptr_t)x); 1036 } 1037 1038 // A negative value of 'x' will return '63' 1039 inline int log2_jlong(jlong x) { 1040 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong)); 1041 return log2_long((julong)x); 1042 } 1043 1044 inline bool is_odd (intx x) { return x & 1; } 1045 inline bool is_even(intx x) { return !is_odd(x); } 1046 1047 // abs methods which cannot overflow and so are well-defined across 1048 // the entire domain of integer types. 1049 static inline unsigned int uabs(unsigned int n) { 1050 union { 1051 unsigned int result; 1052 int value; 1053 }; 1054 result = n; 1055 if (value < 0) result = 0-result; 1056 return result; 1057 } 1058 static inline julong uabs(julong n) { 1059 union { 1060 julong result; 1061 jlong value; 1062 }; 1063 result = n; 1064 if (value < 0) result = 0-result; 1065 return result; 1066 } 1067 static inline julong uabs(jlong n) { return uabs((julong)n); } 1068 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); } 1069 1070 // "to" should be greater than "from." 1071 inline intx byte_size(void* from, void* to) { 1072 return (address)to - (address)from; 1073 } 1074 1075 1076 // Pack and extract shorts to/from ints: 1077 1078 inline int extract_low_short_from_int(jint x) { 1079 return x & 0xffff; 1080 } 1081 1082 inline int extract_high_short_from_int(jint x) { 1083 return (x >> 16) & 0xffff; 1084 } 1085 1086 inline int build_int_from_shorts( jushort low, jushort high ) { 1087 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1088 } 1089 1090 // Convert pointer to intptr_t, for use in printing pointers. 1091 inline intptr_t p2i(const void * p) { 1092 return (intptr_t) p; 1093 } 1094 1095 // swap a & b 1096 template<class T> static void swap(T& a, T& b) { 1097 T tmp = a; 1098 a = b; 1099 b = tmp; 1100 } 1101 1102 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1103 1104 //---------------------------------------------------------------------------------------------------- 1105 // Sum and product which can never overflow: they wrap, just like the 1106 // Java operations. Note that we don't intend these to be used for 1107 // general-purpose arithmetic: their purpose is to emulate Java 1108 // operations. 1109 1110 // The goal of this code to avoid undefined or implementation-defined 1111 // behavior. The use of an lvalue to reference cast is explicitly 1112 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1113 // 15 in C++03] 1114 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1115 inline TYPE NAME (TYPE in1, TYPE in2) { \ 1116 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1117 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1118 return reinterpret_cast<TYPE&>(ures); \ 1119 } 1120 1121 JAVA_INTEGER_OP(+, java_add, jint, juint) 1122 JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1123 JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1124 JAVA_INTEGER_OP(+, java_add, jlong, julong) 1125 JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1126 JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1127 1128 #undef JAVA_INTEGER_OP 1129 1130 // Provide integer shift operations with Java semantics. No overflow 1131 // issues - left shifts simply discard shifted out bits. No undefined 1132 // behavior for large or negative shift quantities; instead the actual 1133 // shift distance is the argument modulo the lhs value's size in bits. 1134 // No undefined or implementation defined behavior for shifting negative 1135 // values; left shift discards bits, right shift sign extends. We use 1136 // the same safe conversion technique as above for java_add and friends. 1137 #define JAVA_INTEGER_SHIFT_OP(OP, NAME, TYPE, XTYPE) \ 1138 inline TYPE NAME (TYPE lhs, jint rhs) { \ 1139 const uint rhs_mask = (sizeof(TYPE) * 8) - 1; \ 1140 STATIC_ASSERT(rhs_mask == 31 || rhs_mask == 63); \ 1141 XTYPE xres = static_cast<XTYPE>(lhs); \ 1142 xres OP ## = (rhs & rhs_mask); \ 1143 return reinterpret_cast<TYPE&>(xres); \ 1144 } 1145 1146 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jint, juint) 1147 JAVA_INTEGER_SHIFT_OP(<<, java_shift_left, jlong, julong) 1148 // For signed shift right, assume C++ implementation >> sign extends. 1149 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jint, jint) 1150 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right, jlong, jlong) 1151 // For >>> use C++ unsigned >>. 1152 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jint, juint) 1153 JAVA_INTEGER_SHIFT_OP(>>, java_shift_right_unsigned, jlong, julong) 1154 1155 #undef JAVA_INTEGER_SHIFT_OP 1156 1157 //---------------------------------------------------------------------------------------------------- 1158 // The goal of this code is to provide saturating operations for int/uint. 1159 // Checks overflow conditions and saturates the result to min_jint/max_jint. 1160 #define SATURATED_INTEGER_OP(OP, NAME, TYPE1, TYPE2) \ 1161 inline int NAME (TYPE1 in1, TYPE2 in2) { \ 1162 jlong res = static_cast<jlong>(in1); \ 1163 res OP ## = static_cast<jlong>(in2); \ 1164 if (res > max_jint) { \ 1165 res = max_jint; \ 1166 } else if (res < min_jint) { \ 1167 res = min_jint; \ 1168 } \ 1169 return static_cast<int>(res); \ 1170 } 1171 1172 SATURATED_INTEGER_OP(+, saturated_add, int, int) 1173 SATURATED_INTEGER_OP(+, saturated_add, int, uint) 1174 SATURATED_INTEGER_OP(+, saturated_add, uint, int) 1175 SATURATED_INTEGER_OP(+, saturated_add, uint, uint) 1176 1177 #undef SATURATED_INTEGER_OP 1178 1179 // Dereference vptr 1180 // All C++ compilers that we know of have the vtbl pointer in the first 1181 // word. If there are exceptions, this function needs to be made compiler 1182 // specific. 1183 static inline void* dereference_vptr(const void* addr) { 1184 return *(void**)addr; 1185 } 1186 1187 //---------------------------------------------------------------------------------------------------- 1188 // String type aliases used by command line flag declarations and 1189 // processing utilities. 1190 1191 typedef const char* ccstr; 1192 typedef const char* ccstrlist; // represents string arguments which accumulate 1193 1194 //---------------------------------------------------------------------------------------------------- 1195 // Default hash/equals functions used by ResourceHashtable and KVHashtable 1196 1197 template<typename K> unsigned primitive_hash(const K& k) { 1198 unsigned hash = (unsigned)((uintptr_t)k); 1199 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs 1200 } 1201 1202 template<typename K> bool primitive_equals(const K& k0, const K& k1) { 1203 return k0 == k1; 1204 } 1205 1206 1207 #endif // SHARE_UTILITIES_GLOBALDEFINITIONS_HPP