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