1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_UTILITIES_GLOBALDEFINITIONS_HPP 26 #define SHARE_UTILITIES_GLOBALDEFINITIONS_HPP 27 28 #include "utilities/compilerWarnings.hpp" 29 #include "utilities/debug.hpp" 30 #include "utilities/macros.hpp" 31 32 #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 // These are #defines to selectively turn on/off the Print(Opto)Assembly 47 // capabilities. Choices should be led by a tradeoff between 48 // code size and improved supportability. 49 // if PRINT_ASSEMBLY then PRINT_ABSTRACT_ASSEMBLY must be true as well 50 // to have a fallback in case hsdis is not available. 51 #if defined(PRODUCT) 52 #define SUPPORT_ABSTRACT_ASSEMBLY 53 #define SUPPORT_ASSEMBLY 54 #undef SUPPORT_OPTO_ASSEMBLY // Can't activate. In PRODUCT, many dump methods are missing. 55 #undef SUPPORT_DATA_STRUCTS // Of limited use. In PRODUCT, many print methods are empty. 56 #else 57 #define SUPPORT_ABSTRACT_ASSEMBLY 58 #define SUPPORT_ASSEMBLY 59 #define SUPPORT_OPTO_ASSEMBLY 60 #define SUPPORT_DATA_STRUCTS 61 #endif 62 #if defined(SUPPORT_ASSEMBLY) && !defined(SUPPORT_ABSTRACT_ASSEMBLY) 63 #define SUPPORT_ABSTRACT_ASSEMBLY 64 #endif 65 66 // This file holds all globally used constants & types, class (forward) 67 // declarations and a few frequently used utility functions. 68 69 //---------------------------------------------------------------------------------------------------- 70 // Printf-style formatters for fixed- and variable-width types as pointers and 71 // integers. These are derived from the definitions in inttypes.h. If the platform 72 // doesn't provide appropriate definitions, they should be provided in 73 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp) 74 75 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false") 76 77 // Format 32-bit quantities. 78 #define INT32_FORMAT "%" PRId32 79 #define UINT32_FORMAT "%" PRIu32 80 #define INT32_FORMAT_W(width) "%" #width PRId32 81 #define UINT32_FORMAT_W(width) "%" #width PRIu32 82 83 #define PTR32_FORMAT "0x%08" PRIx32 84 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32 85 86 // Format 64-bit quantities. 87 #define INT64_FORMAT "%" PRId64 88 #define UINT64_FORMAT "%" PRIu64 89 #define UINT64_FORMAT_X "%" PRIx64 90 #define INT64_FORMAT_W(width) "%" #width PRId64 91 #define UINT64_FORMAT_W(width) "%" #width PRIu64 92 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64 93 94 #define PTR64_FORMAT "0x%016" PRIx64 95 96 // Format jlong, if necessary 97 #ifndef JLONG_FORMAT 98 #define JLONG_FORMAT INT64_FORMAT 99 #endif 100 #ifndef JLONG_FORMAT_W 101 #define JLONG_FORMAT_W(width) INT64_FORMAT_W(width) 102 #endif 103 #ifndef JULONG_FORMAT 104 #define JULONG_FORMAT UINT64_FORMAT 105 #endif 106 #ifndef JULONG_FORMAT_X 107 #define JULONG_FORMAT_X UINT64_FORMAT_X 108 #endif 109 110 // Format pointers which change size between 32- and 64-bit. 111 #ifdef _LP64 112 #define INTPTR_FORMAT "0x%016" PRIxPTR 113 #define PTR_FORMAT "0x%016" PRIxPTR 114 #else // !_LP64 115 #define INTPTR_FORMAT "0x%08" PRIxPTR 116 #define PTR_FORMAT "0x%08" PRIxPTR 117 #endif // _LP64 118 119 // Format pointers without leading zeros 120 #define INTPTRNZ_FORMAT "0x%" PRIxPTR 121 122 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR 123 124 #define SSIZE_FORMAT "%" PRIdPTR 125 #define SIZE_FORMAT "%" PRIuPTR 126 #define SIZE_FORMAT_HEX "0x%" PRIxPTR 127 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR 128 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR 129 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR 130 131 #define INTX_FORMAT "%" PRIdPTR 132 #define UINTX_FORMAT "%" PRIuPTR 133 #define INTX_FORMAT_W(width) "%" #width PRIdPTR 134 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR 135 136 //---------------------------------------------------------------------------------------------------- 137 // Constants 138 139 const int LogBytesPerShort = 1; 140 const int LogBytesPerInt = 2; 141 #ifdef _LP64 142 const int LogBytesPerWord = 3; 143 #else 144 const int LogBytesPerWord = 2; 145 #endif 146 const int LogBytesPerLong = 3; 147 148 const int BytesPerShort = 1 << LogBytesPerShort; 149 const int BytesPerInt = 1 << LogBytesPerInt; 150 const int BytesPerWord = 1 << LogBytesPerWord; 151 const int BytesPerLong = 1 << LogBytesPerLong; 152 153 const int LogBitsPerByte = 3; 154 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort; 155 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt; 156 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord; 157 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong; 158 159 const int BitsPerByte = 1 << LogBitsPerByte; 160 const int BitsPerShort = 1 << LogBitsPerShort; 161 const int BitsPerInt = 1 << LogBitsPerInt; 162 const int BitsPerWord = 1 << LogBitsPerWord; 163 const int BitsPerLong = 1 << LogBitsPerLong; 164 165 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1; 166 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1; 167 168 const int WordsPerLong = 2; // Number of stack entries for longs 169 170 const int oopSize = sizeof(char*); // Full-width oop 171 extern int heapOopSize; // Oop within a java object 172 const int wordSize = sizeof(char*); 173 const int longSize = sizeof(jlong); 174 const int jintSize = sizeof(jint); 175 const int size_tSize = sizeof(size_t); 176 177 const int BytesPerOop = BytesPerWord; // Full-width oop 178 179 extern int LogBytesPerHeapOop; // Oop within a java object 180 extern int LogBitsPerHeapOop; 181 extern int BytesPerHeapOop; 182 extern int BitsPerHeapOop; 183 184 const int BitsPerJavaInteger = 32; 185 const int BitsPerJavaLong = 64; 186 const int BitsPerSize_t = size_tSize * BitsPerByte; 187 188 // Size of a char[] needed to represent a jint as a string in decimal. 189 const int jintAsStringSize = 12; 190 191 // An opaque type, so that HeapWord* can be a generic pointer into the heap. 192 // We require that object sizes be measured in units of heap words (e.g. 193 // pointer-sized values), so that given HeapWord* hw, 194 // hw += oop(hw)->foo(); 195 // works, where foo is a method (like size or scavenge) that returns the 196 // object size. 197 class HeapWordImpl; // Opaque, never defined. 198 typedef HeapWordImpl* HeapWord; 199 200 // Analogous opaque struct for metadata allocated from metaspaces. 201 class MetaWordImpl; // Opaque, never defined. 202 typedef MetaWordImpl* MetaWord; 203 204 // HeapWordSize must be 2^LogHeapWordSize. 205 const int HeapWordSize = sizeof(HeapWord); 206 #ifdef _LP64 207 const int LogHeapWordSize = 3; 208 #else 209 const int LogHeapWordSize = 2; 210 #endif 211 const int HeapWordsPerLong = BytesPerLong / HeapWordSize; 212 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize; 213 214 // The minimum number of native machine words necessary to contain "byte_size" 215 // bytes. 216 inline size_t heap_word_size(size_t byte_size) { 217 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize; 218 } 219 220 //------------------------------------------- 221 // Constant for jlong (standardized by C++11) 222 223 // Build a 64bit integer constant 224 #define CONST64(x) (x ## LL) 225 #define UCONST64(x) (x ## ULL) 226 227 const jlong min_jlong = CONST64(0x8000000000000000); 228 const jlong max_jlong = CONST64(0x7fffffffffffffff); 229 230 const size_t K = 1024; 231 const size_t M = K*K; 232 const size_t G = M*K; 233 const size_t HWperKB = K / sizeof(HeapWord); 234 235 // Constants for converting from a base unit to milli-base units. For 236 // example from seconds to milliseconds and microseconds 237 238 const int MILLIUNITS = 1000; // milli units per base unit 239 const int MICROUNITS = 1000000; // micro units per base unit 240 const int NANOUNITS = 1000000000; // nano units per base unit 241 242 const jlong NANOSECS_PER_SEC = CONST64(1000000000); 243 const jint NANOSECS_PER_MILLISEC = 1000000; 244 245 // Proper units routines try to maintain at least three significant digits. 246 // In worst case, it would print five significant digits with lower prefix. 247 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow, 248 // and therefore we need to be careful. 249 250 inline const char* proper_unit_for_byte_size(size_t s) { 251 #ifdef _LP64 252 if (s >= 100*G) { 253 return "G"; 254 } 255 #endif 256 if (s >= 100*M) { 257 return "M"; 258 } else if (s >= 100*K) { 259 return "K"; 260 } else { 261 return "B"; 262 } 263 } 264 265 template <class T> 266 inline T byte_size_in_proper_unit(T s) { 267 #ifdef _LP64 268 if (s >= 100*G) { 269 return (T)(s/G); 270 } 271 #endif 272 if (s >= 100*M) { 273 return (T)(s/M); 274 } else if (s >= 100*K) { 275 return (T)(s/K); 276 } else { 277 return s; 278 } 279 } 280 281 inline const char* exact_unit_for_byte_size(size_t s) { 282 #ifdef _LP64 283 if (s >= G && (s % G) == 0) { 284 return "G"; 285 } 286 #endif 287 if (s >= M && (s % M) == 0) { 288 return "M"; 289 } 290 if (s >= K && (s % K) == 0) { 291 return "K"; 292 } 293 return "B"; 294 } 295 296 inline size_t byte_size_in_exact_unit(size_t s) { 297 #ifdef _LP64 298 if (s >= G && (s % G) == 0) { 299 return s / G; 300 } 301 #endif 302 if (s >= M && (s % M) == 0) { 303 return s / M; 304 } 305 if (s >= K && (s % K) == 0) { 306 return s / K; 307 } 308 return s; 309 } 310 311 //---------------------------------------------------------------------------------------------------- 312 // VM type definitions 313 314 // intx and uintx are the 'extended' int and 'extended' unsigned int types; 315 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 316 317 typedef intptr_t intx; 318 typedef uintptr_t uintx; 319 320 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 321 const intx max_intx = (uintx)min_intx - 1; 322 const uintx max_uintx = (uintx)-1; 323 324 // Table of values: 325 // sizeof intx 4 8 326 // min_intx 0x80000000 0x8000000000000000 327 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 328 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 329 330 typedef unsigned int uint; NEEDS_CLEANUP 331 332 333 //---------------------------------------------------------------------------------------------------- 334 // Java type definitions 335 336 // All kinds of 'plain' byte addresses 337 typedef signed char s_char; 338 typedef unsigned char u_char; 339 typedef u_char* address; 340 typedef uintptr_t address_word; // unsigned integer which will hold a pointer 341 // except for some implementations of a C++ 342 // linkage pointer to function. Should never 343 // need one of those to be placed in this 344 // type anyway. 345 346 // Utility functions to "portably" (?) bit twiddle pointers 347 // Where portable means keep ANSI C++ compilers quiet 348 349 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 350 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 351 352 // Utility functions to "portably" make cast to/from function pointers. 353 354 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 355 inline address_word castable_address(address x) { return address_word(x) ; } 356 inline address_word castable_address(void* x) { return address_word(x) ; } 357 358 // Pointer subtraction. 359 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 360 // the range we might need to find differences from one end of the heap 361 // to the other. 362 // A typical use might be: 363 // if (pointer_delta(end(), top()) >= size) { 364 // // enough room for an object of size 365 // ... 366 // and then additions like 367 // ... top() + size ... 368 // are safe because we know that top() is at least size below end(). 369 inline size_t pointer_delta(const volatile void* left, 370 const volatile void* right, 371 size_t element_size) { 372 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 373 } 374 375 // A version specialized for HeapWord*'s. 376 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 377 return pointer_delta(left, right, sizeof(HeapWord)); 378 } 379 // A version specialized for MetaWord*'s. 380 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 381 return pointer_delta(left, right, sizeof(MetaWord)); 382 } 383 384 // 385 // ANSI C++ does not allow casting from one pointer type to a function pointer 386 // directly without at best a warning. This macro accomplishes it silently 387 // In every case that is present at this point the value be cast is a pointer 388 // to a C linkage function. In some case the type used for the cast reflects 389 // that linkage and a picky compiler would not complain. In other cases because 390 // there is no convenient place to place a typedef with extern C linkage (i.e 391 // a platform dependent header file) it doesn't. At this point no compiler seems 392 // picky enough to catch these instances (which are few). It is possible that 393 // using templates could fix these for all cases. This use of templates is likely 394 // so far from the middle of the road that it is likely to be problematic in 395 // many C++ compilers. 396 // 397 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 398 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 399 400 // Unsigned byte types for os and stream.hpp 401 402 // Unsigned one, two, four and eigth byte quantities used for describing 403 // the .class file format. See JVM book chapter 4. 404 405 typedef jubyte u1; 406 typedef jushort u2; 407 typedef juint u4; 408 typedef julong u8; 409 410 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 411 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 412 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 413 const julong max_julong = (julong)-1; // 0xFF....FF largest julong 414 415 typedef jbyte s1; 416 typedef jshort s2; 417 typedef jint s4; 418 typedef jlong s8; 419 420 const jbyte min_jbyte = -(1 << 7); // smallest jbyte 421 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 422 const jshort min_jshort = -(1 << 15); // smallest jshort 423 const jshort max_jshort = (1 << 15) - 1; // largest jshort 424 425 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 426 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 427 428 //---------------------------------------------------------------------------------------------------- 429 // JVM spec restrictions 430 431 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 432 433 //---------------------------------------------------------------------------------------------------- 434 // Object alignment, in units of HeapWords. 435 // 436 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 437 // reference fields can be naturally aligned. 438 439 extern int MinObjAlignment; 440 extern int MinObjAlignmentInBytes; 441 extern int MinObjAlignmentInBytesMask; 442 443 extern int LogMinObjAlignment; 444 extern int LogMinObjAlignmentInBytes; 445 446 const int LogKlassAlignmentInBytes = 3; 447 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 448 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 449 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 450 451 // Maximal size of heap where unscaled compression can be used. Also upper bound 452 // for heap placement: 4GB. 453 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 454 // Maximal size of heap where compressed oops can be used. Also upper bound for heap 455 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 456 extern uint64_t OopEncodingHeapMax; 457 458 // Maximal size of compressed class space. Above this limit compression is not possible. 459 // Also upper bound for placement of zero based class space. (Class space is further limited 460 // to be < 3G, see arguments.cpp.) 461 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 462 463 // Machine dependent stuff 464 465 // The maximum size of the code cache. Can be overridden by targets. 466 #define CODE_CACHE_SIZE_LIMIT (2*G) 467 // Allow targets to reduce the default size of the code cache. 468 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 469 470 #include CPU_HEADER(globalDefinitions) 471 472 // To assure the IRIW property on processors that are not multiple copy 473 // atomic, sync instructions must be issued between volatile reads to 474 // assure their ordering, instead of after volatile stores. 475 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 476 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 477 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC 478 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true; 479 #else 480 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 481 #endif 482 483 // The expected size in bytes of a cache line, used to pad data structures. 484 #ifndef DEFAULT_CACHE_LINE_SIZE 485 #define DEFAULT_CACHE_LINE_SIZE 64 486 #endif 487 488 489 //---------------------------------------------------------------------------------------------------- 490 // Utility macros for compilers 491 // used to silence compiler warnings 492 493 #define Unused_Variable(var) var 494 495 496 //---------------------------------------------------------------------------------------------------- 497 // Miscellaneous 498 499 // 6302670 Eliminate Hotspot __fabsf dependency 500 // All fabs() callers should call this function instead, which will implicitly 501 // convert the operand to double, avoiding a dependency on __fabsf which 502 // doesn't exist in early versions of Solaris 8. 503 inline double fabsd(double value) { 504 return fabs(value); 505 } 506 507 // Returns numerator/denominator as percentage value from 0 to 100. If denominator 508 // is zero, return 0.0. 509 template<typename T> 510 inline double percent_of(T numerator, T denominator) { 511 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 512 } 513 514 //---------------------------------------------------------------------------------------------------- 515 // Special casts 516 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern 517 typedef union { 518 jfloat f; 519 jint i; 520 } FloatIntConv; 521 522 typedef union { 523 jdouble d; 524 jlong l; 525 julong ul; 526 } DoubleLongConv; 527 528 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 529 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 530 531 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 532 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 533 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 534 535 inline jint low (jlong value) { return jint(value); } 536 inline jint high(jlong value) { return jint(value >> 32); } 537 538 // the fancy casts are a hopefully portable way 539 // to do unsigned 32 to 64 bit type conversion 540 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 541 *value |= (jlong)(julong)(juint)low; } 542 543 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 544 *value |= (jlong)high << 32; } 545 546 inline jlong jlong_from(jint h, jint l) { 547 jlong result = 0; // initialization to avoid warning 548 set_high(&result, h); 549 set_low(&result, l); 550 return result; 551 } 552 553 union jlong_accessor { 554 jint words[2]; 555 jlong long_value; 556 }; 557 558 void basic_types_init(); // cannot define here; uses assert 559 560 561 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 562 enum BasicType { 563 T_BOOLEAN = 4, 564 T_CHAR = 5, 565 T_FLOAT = 6, 566 T_DOUBLE = 7, 567 T_BYTE = 8, 568 T_SHORT = 9, 569 T_INT = 10, 570 T_LONG = 11, 571 T_OBJECT = 12, 572 T_ARRAY = 13, 573 T_VOID = 14, 574 T_ADDRESS = 15, 575 T_NARROWOOP = 16, 576 T_METADATA = 17, 577 T_NARROWKLASS = 18, 578 T_CONFLICT = 19, // for stack value type with conflicting contents 579 T_ILLEGAL = 99 580 }; 581 582 inline bool is_java_primitive(BasicType t) { 583 return T_BOOLEAN <= t && t <= T_LONG; 584 } 585 586 inline bool is_subword_type(BasicType t) { 587 // these guys are processed exactly like T_INT in calling sequences: 588 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 589 } 590 591 inline bool is_signed_subword_type(BasicType t) { 592 return (t == T_BYTE || t == T_SHORT); 593 } 594 595 inline bool is_reference_type(BasicType t) { 596 return (t == T_OBJECT || t == T_ARRAY); 597 } 598 599 // Convert a char from a classfile signature to a BasicType 600 inline BasicType char2type(char c) { 601 switch( c ) { 602 case 'B': return T_BYTE; 603 case 'C': return T_CHAR; 604 case 'D': return T_DOUBLE; 605 case 'F': return T_FLOAT; 606 case 'I': return T_INT; 607 case 'J': return T_LONG; 608 case 'S': return T_SHORT; 609 case 'Z': return T_BOOLEAN; 610 case 'V': return T_VOID; 611 case 'L': return T_OBJECT; 612 case '[': return T_ARRAY; 613 } 614 return T_ILLEGAL; 615 } 616 617 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 618 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 619 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 620 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 621 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 622 extern BasicType name2type(const char* name); 623 624 // Auxiliary math routines 625 // least common multiple 626 extern size_t lcm(size_t a, size_t b); 627 628 629 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 630 enum BasicTypeSize { 631 T_BOOLEAN_size = 1, 632 T_CHAR_size = 1, 633 T_FLOAT_size = 1, 634 T_DOUBLE_size = 2, 635 T_BYTE_size = 1, 636 T_SHORT_size = 1, 637 T_INT_size = 1, 638 T_LONG_size = 2, 639 T_OBJECT_size = 1, 640 T_ARRAY_size = 1, 641 T_NARROWOOP_size = 1, 642 T_NARROWKLASS_size = 1, 643 T_VOID_size = 0 644 }; 645 646 647 // maps a BasicType to its instance field storage type: 648 // all sub-word integral types are widened to T_INT 649 extern BasicType type2field[T_CONFLICT+1]; 650 extern BasicType type2wfield[T_CONFLICT+1]; 651 652 653 // size in bytes 654 enum ArrayElementSize { 655 T_BOOLEAN_aelem_bytes = 1, 656 T_CHAR_aelem_bytes = 2, 657 T_FLOAT_aelem_bytes = 4, 658 T_DOUBLE_aelem_bytes = 8, 659 T_BYTE_aelem_bytes = 1, 660 T_SHORT_aelem_bytes = 2, 661 T_INT_aelem_bytes = 4, 662 T_LONG_aelem_bytes = 8, 663 #ifdef _LP64 664 T_OBJECT_aelem_bytes = 8, 665 T_ARRAY_aelem_bytes = 8, 666 #else 667 T_OBJECT_aelem_bytes = 4, 668 T_ARRAY_aelem_bytes = 4, 669 #endif 670 T_NARROWOOP_aelem_bytes = 4, 671 T_NARROWKLASS_aelem_bytes = 4, 672 T_VOID_aelem_bytes = 0 673 }; 674 675 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 676 #ifdef ASSERT 677 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 678 #else 679 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 680 #endif 681 682 683 // JavaValue serves as a container for arbitrary Java values. 684 685 class JavaValue { 686 687 public: 688 typedef union JavaCallValue { 689 jfloat f; 690 jdouble d; 691 jint i; 692 jlong l; 693 jobject h; 694 } JavaCallValue; 695 696 private: 697 BasicType _type; 698 JavaCallValue _value; 699 700 public: 701 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 702 703 JavaValue(jfloat value) { 704 _type = T_FLOAT; 705 _value.f = value; 706 } 707 708 JavaValue(jdouble value) { 709 _type = T_DOUBLE; 710 _value.d = value; 711 } 712 713 jfloat get_jfloat() const { return _value.f; } 714 jdouble get_jdouble() const { return _value.d; } 715 jint get_jint() const { return _value.i; } 716 jlong get_jlong() const { return _value.l; } 717 jobject get_jobject() const { return _value.h; } 718 JavaCallValue* get_value_addr() { return &_value; } 719 BasicType get_type() const { return _type; } 720 721 void set_jfloat(jfloat f) { _value.f = f;} 722 void set_jdouble(jdouble d) { _value.d = d;} 723 void set_jint(jint i) { _value.i = i;} 724 void set_jlong(jlong l) { _value.l = l;} 725 void set_jobject(jobject h) { _value.h = h;} 726 void set_type(BasicType t) { _type = t; } 727 728 jboolean get_jboolean() const { return (jboolean) (_value.i);} 729 jbyte get_jbyte() const { return (jbyte) (_value.i);} 730 jchar get_jchar() const { return (jchar) (_value.i);} 731 jshort get_jshort() const { return (jshort) (_value.i);} 732 733 }; 734 735 736 #define STACK_BIAS 0 737 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 738 // in order to extend the reach of the stack pointer. 739 #if defined(SPARC) && defined(_LP64) 740 #undef STACK_BIAS 741 #define STACK_BIAS 0x7ff 742 #endif 743 744 745 // TosState describes the top-of-stack state before and after the execution of 746 // a bytecode or method. The top-of-stack value may be cached in one or more CPU 747 // registers. The TosState corresponds to the 'machine representation' of this cached 748 // value. There's 4 states corresponding to the JAVA types int, long, float & double 749 // as well as a 5th state in case the top-of-stack value is actually on the top 750 // of stack (in memory) and thus not cached. The atos state corresponds to the itos 751 // state when it comes to machine representation but is used separately for (oop) 752 // type specific operations (e.g. verification code). 753 754 enum TosState { // describes the tos cache contents 755 btos = 0, // byte, bool tos cached 756 ztos = 1, // byte, bool tos cached 757 ctos = 2, // char tos cached 758 stos = 3, // short tos cached 759 itos = 4, // int tos cached 760 ltos = 5, // long tos cached 761 ftos = 6, // float tos cached 762 dtos = 7, // double tos cached 763 atos = 8, // object cached 764 vtos = 9, // tos not cached 765 number_of_states, 766 ilgl // illegal state: should not occur 767 }; 768 769 770 inline TosState as_TosState(BasicType type) { 771 switch (type) { 772 case T_BYTE : return btos; 773 case T_BOOLEAN: return ztos; 774 case T_CHAR : return ctos; 775 case T_SHORT : return stos; 776 case T_INT : return itos; 777 case T_LONG : return ltos; 778 case T_FLOAT : return ftos; 779 case T_DOUBLE : return dtos; 780 case T_VOID : return vtos; 781 case T_ARRAY : // fall through 782 case T_OBJECT : return atos; 783 default : return ilgl; 784 } 785 } 786 787 inline BasicType as_BasicType(TosState state) { 788 switch (state) { 789 case btos : return T_BYTE; 790 case ztos : return T_BOOLEAN; 791 case ctos : return T_CHAR; 792 case stos : return T_SHORT; 793 case itos : return T_INT; 794 case ltos : return T_LONG; 795 case ftos : return T_FLOAT; 796 case dtos : return T_DOUBLE; 797 case atos : return T_OBJECT; 798 case vtos : return T_VOID; 799 default : return T_ILLEGAL; 800 } 801 } 802 803 804 // Helper function to convert BasicType info into TosState 805 // Note: Cannot define here as it uses global constant at the time being. 806 TosState as_TosState(BasicType type); 807 808 809 // JavaThreadState keeps track of which part of the code a thread is executing in. This 810 // information is needed by the safepoint code. 811 // 812 // There are 4 essential states: 813 // 814 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 815 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 816 // _thread_in_vm : Executing in the vm 817 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 818 // 819 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 820 // a transition from one state to another. These extra states makes it possible for the safepoint code to 821 // handle certain thread_states without having to suspend the thread - making the safepoint code faster. 822 // 823 // Given a state, the xxxx_trans state can always be found by adding 1. 824 // 825 enum JavaThreadState { 826 _thread_uninitialized = 0, // should never happen (missing initialization) 827 _thread_new = 2, // just starting up, i.e., in process of being initialized 828 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 829 _thread_in_native = 4, // running in native code 830 _thread_in_native_trans = 5, // corresponding transition state 831 _thread_in_vm = 6, // running in VM 832 _thread_in_vm_trans = 7, // corresponding transition state 833 _thread_in_Java = 8, // running in Java or in stub code 834 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 835 _thread_blocked = 10, // blocked in vm 836 _thread_blocked_trans = 11, // corresponding transition state 837 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 838 }; 839 840 //---------------------------------------------------------------------------------------------------- 841 // Special constants for debugging 842 843 const jint badInt = -3; // generic "bad int" value 844 const intptr_t badAddressVal = -2; // generic "bad address" value 845 const intptr_t badOopVal = -1; // generic "bad oop" value 846 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 847 const int badStackSegVal = 0xCA; // value used to zap stack segments 848 const int badHandleValue = 0xBC; // value used to zap vm handle area 849 const int badResourceValue = 0xAB; // value used to zap resource area 850 const int freeBlockPad = 0xBA; // value used to pad freed blocks. 851 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 852 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 853 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 854 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 855 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 856 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 857 858 859 // (These must be implemented as #defines because C++ compilers are 860 // not obligated to inline non-integral constants!) 861 #define badAddress ((address)::badAddressVal) 862 #define badOop (cast_to_oop(::badOopVal)) 863 #define badHeapWord (::badHeapWordVal) 864 865 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 866 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 867 868 //---------------------------------------------------------------------------------------------------- 869 // Utility functions for bitfield manipulations 870 871 const intptr_t AllBits = ~0; // all bits set in a word 872 const intptr_t NoBits = 0; // no bits set in a word 873 const jlong NoLongBits = 0; // no bits set in a long 874 const intptr_t OneBit = 1; // only right_most bit set in a word 875 876 // get a word with the n.th or the right-most or left-most n bits set 877 // (note: #define used only so that they can be used in enum constant definitions) 878 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 879 #define right_n_bits(n) (nth_bit(n) - 1) 880 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 881 882 // bit-operations using a mask m 883 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 884 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 885 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 886 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 887 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 888 889 // bit-operations using the n.th bit 890 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 891 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 892 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 893 894 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 895 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 896 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 897 } 898 899 900 //---------------------------------------------------------------------------------------------------- 901 // Utility functions for integers 902 903 // Avoid use of global min/max macros which may cause unwanted double 904 // evaluation of arguments. 905 #ifdef max 906 #undef max 907 #endif 908 909 #ifdef min 910 #undef min 911 #endif 912 913 // It is necessary to use templates here. Having normal overloaded 914 // functions does not work because it is necessary to provide both 32- 915 // and 64-bit overloaded functions, which does not work, and having 916 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 917 // will be even more error-prone than macros. 918 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 919 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 920 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 921 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 922 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 923 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 924 925 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 926 927 // true if x is a power of 2, false otherwise 928 inline bool is_power_of_2(intptr_t x) { 929 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits)); 930 } 931 932 // long version of is_power_of_2 933 inline bool is_power_of_2_long(jlong x) { 934 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits)); 935 } 936 937 // Returns largest i such that 2^i <= x. 938 // If x == 0, the function returns -1. 939 inline int log2_intptr(uintptr_t x) { 940 int i = -1; 941 uintptr_t p = 1; 942 while (p != 0 && p <= x) { 943 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 944 i++; p *= 2; 945 } 946 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 947 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 948 return i; 949 } 950 951 //* largest i such that 2^i <= x 952 inline int log2_long(julong x) { 953 int i = -1; 954 julong p = 1; 955 while (p != 0 && p <= x) { 956 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 957 i++; p *= 2; 958 } 959 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 960 // (if p = 0 then overflow occurred and i = 63) 961 return i; 962 } 963 964 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 965 inline int log2_intptr(intptr_t x) { 966 return log2_intptr((uintptr_t)x); 967 } 968 969 inline int log2_int(int x) { 970 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t)); 971 return log2_intptr((uintptr_t)x); 972 } 973 974 inline int log2_jint(jint x) { 975 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t)); 976 return log2_intptr((uintptr_t)x); 977 } 978 979 inline int log2_uint(uint x) { 980 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t)); 981 return log2_intptr((uintptr_t)x); 982 } 983 984 // A negative value of 'x' will return '63' 985 inline int log2_jlong(jlong x) { 986 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong)); 987 return log2_long((julong)x); 988 } 989 990 //* the argument must be exactly a power of 2 991 inline int exact_log2(intptr_t x) { 992 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x); 993 return log2_intptr(x); 994 } 995 996 //* the argument must be exactly a power of 2 997 inline int exact_log2_long(jlong x) { 998 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x); 999 return log2_long(x); 1000 } 1001 1002 inline bool is_odd (intx x) { return x & 1; } 1003 inline bool is_even(intx x) { return !is_odd(x); } 1004 1005 // abs methods which cannot overflow and so are well-defined across 1006 // the entire domain of integer types. 1007 static inline unsigned int uabs(unsigned int n) { 1008 union { 1009 unsigned int result; 1010 int value; 1011 }; 1012 result = n; 1013 if (value < 0) result = 0-result; 1014 return result; 1015 } 1016 static inline julong uabs(julong n) { 1017 union { 1018 julong result; 1019 jlong value; 1020 }; 1021 result = n; 1022 if (value < 0) result = 0-result; 1023 return result; 1024 } 1025 static inline julong uabs(jlong n) { return uabs((julong)n); } 1026 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); } 1027 1028 // "to" should be greater than "from." 1029 inline intx byte_size(void* from, void* to) { 1030 return (address)to - (address)from; 1031 } 1032 1033 1034 // Pack and extract shorts to/from ints: 1035 1036 inline int extract_low_short_from_int(jint x) { 1037 return x & 0xffff; 1038 } 1039 1040 inline int extract_high_short_from_int(jint x) { 1041 return (x >> 16) & 0xffff; 1042 } 1043 1044 inline int build_int_from_shorts( jushort low, jushort high ) { 1045 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1046 } 1047 1048 // Convert pointer to intptr_t, for use in printing pointers. 1049 inline intptr_t p2i(const void * p) { 1050 return (intptr_t) p; 1051 } 1052 1053 // swap a & b 1054 template<class T> static void swap(T& a, T& b) { 1055 T tmp = a; 1056 a = b; 1057 b = tmp; 1058 } 1059 1060 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1061 1062 //---------------------------------------------------------------------------------------------------- 1063 // Sum and product which can never overflow: they wrap, just like the 1064 // Java operations. Note that we don't intend these to be used for 1065 // general-purpose arithmetic: their purpose is to emulate Java 1066 // operations. 1067 1068 // The goal of this code to avoid undefined or implementation-defined 1069 // behavior. The use of an lvalue to reference cast is explicitly 1070 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1071 // 15 in C++03] 1072 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1073 inline TYPE NAME (TYPE in1, TYPE in2) { \ 1074 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1075 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1076 return reinterpret_cast<TYPE&>(ures); \ 1077 } 1078 1079 JAVA_INTEGER_OP(+, java_add, jint, juint) 1080 JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1081 JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1082 JAVA_INTEGER_OP(+, java_add, jlong, julong) 1083 JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1084 JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1085 1086 #undef JAVA_INTEGER_OP 1087 1088 // Dereference vptr 1089 // All C++ compilers that we know of have the vtbl pointer in the first 1090 // word. If there are exceptions, this function needs to be made compiler 1091 // specific. 1092 static inline void* dereference_vptr(const void* addr) { 1093 return *(void**)addr; 1094 } 1095 1096 //---------------------------------------------------------------------------------------------------- 1097 // String type aliases used by command line flag declarations and 1098 // processing utilities. 1099 1100 typedef const char* ccstr; 1101 typedef const char* ccstrlist; // represents string arguments which accumulate 1102 1103 //---------------------------------------------------------------------------------------------------- 1104 // Default hash/equals functions used by ResourceHashtable and KVHashtable 1105 1106 template<typename K> unsigned primitive_hash(const K& k) { 1107 unsigned hash = (unsigned)((uintptr_t)k); 1108 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs 1109 } 1110 1111 template<typename K> bool primitive_equals(const K& k0, const K& k1) { 1112 return k0 == k1; 1113 } 1114 1115 1116 #endif // SHARE_UTILITIES_GLOBALDEFINITIONS_HPP