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