1 /* 2 * Copyright (c) 1997, 2010, 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 #include "precompiled.hpp" 26 #include "runtime/os.hpp" 27 #include "utilities/globalDefinitions.hpp" 28 #include "utilities/top.hpp" 29 30 // Basic error support 31 32 // Info for oops within a java object. Defaults are zero so 33 // things will break badly if incorrectly initialized. 34 int heapOopSize = 0; 35 int LogBytesPerHeapOop = 0; 36 int LogBitsPerHeapOop = 0; 37 int BytesPerHeapOop = 0; 38 int BitsPerHeapOop = 0; 39 40 // Object alignment, in units of HeapWords. 41 // Defaults are -1 so things will break badly if incorrectly initialized. 42 int MinObjAlignment = -1; 43 int MinObjAlignmentInBytes = -1; 44 int MinObjAlignmentInBytesMask = 0; 45 46 int LogMinObjAlignment = -1; 47 int LogMinObjAlignmentInBytes = -1; 48 49 // Oop encoding heap max 50 uint64_t OopEncodingHeapMax = 0; 51 52 void basic_fatal(const char* msg) { 53 fatal(msg); 54 } 55 56 // Something to help porters sleep at night 57 58 void basic_types_init() { 59 #ifdef ASSERT 60 #ifdef _LP64 61 assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant"); 62 assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant"); 63 assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant"); 64 assert( 8 == sizeof( intx), "wrong size for basic type"); 65 assert( 8 == sizeof( jobject), "wrong size for basic type"); 66 #else 67 assert(min_intx == (intx)0x80000000, "correct constant"); 68 assert(max_intx == 0x7FFFFFFF, "correct constant"); 69 assert(max_uintx == 0xFFFFFFFF, "correct constant"); 70 assert( 4 == sizeof( intx), "wrong size for basic type"); 71 assert( 4 == sizeof( jobject), "wrong size for basic type"); 72 #endif 73 assert( (~max_juint) == 0, "max_juint has all its bits"); 74 assert( (~max_uintx) == 0, "max_uintx has all its bits"); 75 assert( (~max_julong) == 0, "max_julong has all its bits"); 76 assert( 1 == sizeof( jbyte), "wrong size for basic type"); 77 assert( 2 == sizeof( jchar), "wrong size for basic type"); 78 assert( 2 == sizeof( jshort), "wrong size for basic type"); 79 assert( 4 == sizeof( juint), "wrong size for basic type"); 80 assert( 4 == sizeof( jint), "wrong size for basic type"); 81 assert( 1 == sizeof( jboolean), "wrong size for basic type"); 82 assert( 8 == sizeof( jlong), "wrong size for basic type"); 83 assert( 4 == sizeof( jfloat), "wrong size for basic type"); 84 assert( 8 == sizeof( jdouble), "wrong size for basic type"); 85 assert( 1 == sizeof( u1), "wrong size for basic type"); 86 assert( 2 == sizeof( u2), "wrong size for basic type"); 87 assert( 4 == sizeof( u4), "wrong size for basic type"); 88 89 int num_type_chars = 0; 90 for (int i = 0; i < 99; i++) { 91 if (type2char((BasicType)i) != 0) { 92 assert(char2type(type2char((BasicType)i)) == i, "proper inverses"); 93 num_type_chars++; 94 } 95 } 96 assert(num_type_chars == 11, "must have tested the right number of mappings"); 97 assert(char2type(0) == T_ILLEGAL, "correct illegality"); 98 99 { 100 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) { 101 BasicType vt = (BasicType)i; 102 BasicType ft = type2field[vt]; 103 switch (vt) { 104 // the following types might plausibly show up in memory layouts: 105 case T_BOOLEAN: 106 case T_BYTE: 107 case T_CHAR: 108 case T_SHORT: 109 case T_INT: 110 case T_FLOAT: 111 case T_DOUBLE: 112 case T_LONG: 113 case T_OBJECT: 114 case T_ADDRESS: // random raw pointer 115 case T_NARROWOOP: // compressed pointer 116 case T_CONFLICT: // might as well support a bottom type 117 case T_VOID: // padding or other unaddressed word 118 // layout type must map to itself 119 assert(vt == ft, ""); 120 break; 121 default: 122 // non-layout type must map to a (different) layout type 123 assert(vt != ft, ""); 124 assert(ft == type2field[ft], ""); 125 } 126 // every type must map to same-sized layout type: 127 assert(type2size[vt] == type2size[ft], ""); 128 } 129 } 130 // These are assumed, e.g., when filling HeapWords with juints. 131 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2"); 132 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2"); 133 assert((size_t)HeapWordSize >= sizeof(juint), 134 "HeapWord should be at least as large as juint"); 135 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer"); 136 #endif 137 138 if( JavaPriority1_To_OSPriority != -1 ) 139 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority; 140 if( JavaPriority2_To_OSPriority != -1 ) 141 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority; 142 if( JavaPriority3_To_OSPriority != -1 ) 143 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority; 144 if( JavaPriority4_To_OSPriority != -1 ) 145 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority; 146 if( JavaPriority5_To_OSPriority != -1 ) 147 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority; 148 if( JavaPriority6_To_OSPriority != -1 ) 149 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority; 150 if( JavaPriority7_To_OSPriority != -1 ) 151 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority; 152 if( JavaPriority8_To_OSPriority != -1 ) 153 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority; 154 if( JavaPriority9_To_OSPriority != -1 ) 155 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority; 156 if(JavaPriority10_To_OSPriority != -1 ) 157 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority; 158 159 // Set the size of basic types here (after argument parsing but before 160 // stub generation). 161 if (UseCompressedOops) { 162 // Size info for oops within java objects is fixed 163 heapOopSize = jintSize; 164 LogBytesPerHeapOop = LogBytesPerInt; 165 LogBitsPerHeapOop = LogBitsPerInt; 166 BytesPerHeapOop = BytesPerInt; 167 BitsPerHeapOop = BitsPerInt; 168 } else { 169 heapOopSize = oopSize; 170 LogBytesPerHeapOop = LogBytesPerWord; 171 LogBitsPerHeapOop = LogBitsPerWord; 172 BytesPerHeapOop = BytesPerWord; 173 BitsPerHeapOop = BitsPerWord; 174 } 175 _type2aelembytes[T_OBJECT] = heapOopSize; 176 _type2aelembytes[T_ARRAY] = heapOopSize; 177 } 178 179 180 // Map BasicType to signature character 181 char type2char_tab[T_CONFLICT+1]={ 0, 0, 0, 0, 'Z', 'C', 'F', 'D', 'B', 'S', 'I', 'J', 'L', '[', 'V', 0, 0, 0}; 182 183 // Map BasicType to Java type name 184 const char* type2name_tab[T_CONFLICT+1] = { 185 NULL, NULL, NULL, NULL, 186 "boolean", 187 "char", 188 "float", 189 "double", 190 "byte", 191 "short", 192 "int", 193 "long", 194 "object", 195 "array", 196 "void", 197 "*address*", 198 "*narrowoop*", 199 "*conflict*" 200 }; 201 202 203 BasicType name2type(const char* name) { 204 for (int i = T_BOOLEAN; i <= T_VOID; i++) { 205 BasicType t = (BasicType)i; 206 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name)) 207 return t; 208 } 209 return T_ILLEGAL; 210 } 211 212 213 // Map BasicType to size in words 214 int type2size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, 1, -1}; 215 216 BasicType type2field[T_CONFLICT+1] = { 217 (BasicType)0, // 0, 218 (BasicType)0, // 1, 219 (BasicType)0, // 2, 220 (BasicType)0, // 3, 221 T_BOOLEAN, // T_BOOLEAN = 4, 222 T_CHAR, // T_CHAR = 5, 223 T_FLOAT, // T_FLOAT = 6, 224 T_DOUBLE, // T_DOUBLE = 7, 225 T_BYTE, // T_BYTE = 8, 226 T_SHORT, // T_SHORT = 9, 227 T_INT, // T_INT = 10, 228 T_LONG, // T_LONG = 11, 229 T_OBJECT, // T_OBJECT = 12, 230 T_OBJECT, // T_ARRAY = 13, 231 T_VOID, // T_VOID = 14, 232 T_ADDRESS, // T_ADDRESS = 15, 233 T_NARROWOOP, // T_NARROWOOP= 16, 234 T_CONFLICT // T_CONFLICT = 17, 235 }; 236 237 238 BasicType type2wfield[T_CONFLICT+1] = { 239 (BasicType)0, // 0, 240 (BasicType)0, // 1, 241 (BasicType)0, // 2, 242 (BasicType)0, // 3, 243 T_INT, // T_BOOLEAN = 4, 244 T_INT, // T_CHAR = 5, 245 T_FLOAT, // T_FLOAT = 6, 246 T_DOUBLE, // T_DOUBLE = 7, 247 T_INT, // T_BYTE = 8, 248 T_INT, // T_SHORT = 9, 249 T_INT, // T_INT = 10, 250 T_LONG, // T_LONG = 11, 251 T_OBJECT, // T_OBJECT = 12, 252 T_OBJECT, // T_ARRAY = 13, 253 T_VOID, // T_VOID = 14, 254 T_ADDRESS, // T_ADDRESS = 15, 255 T_NARROWOOP, // T_NARROWOOP = 16, 256 T_CONFLICT // T_CONFLICT = 17, 257 }; 258 259 260 int _type2aelembytes[T_CONFLICT+1] = { 261 0, // 0 262 0, // 1 263 0, // 2 264 0, // 3 265 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4, 266 T_CHAR_aelem_bytes, // T_CHAR = 5, 267 T_FLOAT_aelem_bytes, // T_FLOAT = 6, 268 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7, 269 T_BYTE_aelem_bytes, // T_BYTE = 8, 270 T_SHORT_aelem_bytes, // T_SHORT = 9, 271 T_INT_aelem_bytes, // T_INT = 10, 272 T_LONG_aelem_bytes, // T_LONG = 11, 273 T_OBJECT_aelem_bytes, // T_OBJECT = 12, 274 T_ARRAY_aelem_bytes, // T_ARRAY = 13, 275 0, // T_VOID = 14, 276 T_OBJECT_aelem_bytes, // T_ADDRESS = 15, 277 T_NARROWOOP_aelem_bytes,// T_NARROWOOP= 16, 278 0 // T_CONFLICT = 17, 279 }; 280 281 #ifdef ASSERT 282 int type2aelembytes(BasicType t, bool allow_address) { 283 assert(allow_address || t != T_ADDRESS, " "); 284 return _type2aelembytes[t]; 285 } 286 #endif 287 288 // Support for 64-bit integer arithmetic 289 290 // The following code is mostly taken from JVM typedefs_md.h and system_md.c 291 292 static const jlong high_bit = (jlong)1 << (jlong)63; 293 static const jlong other_bits = ~high_bit; 294 295 jlong float2long(jfloat f) { 296 jlong tmp = (jlong) f; 297 if (tmp != high_bit) { 298 return tmp; 299 } else { 300 if (g_isnan((jdouble)f)) { 301 return 0; 302 } 303 if (f < 0) { 304 return high_bit; 305 } else { 306 return other_bits; 307 } 308 } 309 } 310 311 312 jlong double2long(jdouble f) { 313 jlong tmp = (jlong) f; 314 if (tmp != high_bit) { 315 return tmp; 316 } else { 317 if (g_isnan(f)) { 318 return 0; 319 } 320 if (f < 0) { 321 return high_bit; 322 } else { 323 return other_bits; 324 } 325 } 326 } 327 328 // least common multiple 329 size_t lcm(size_t a, size_t b) { 330 size_t cur, div, next; 331 332 cur = MAX2(a, b); 333 div = MIN2(a, b); 334 335 assert(div != 0, "lcm requires positive arguments"); 336 337 338 while ((next = cur % div) != 0) { 339 cur = div; div = next; 340 } 341 342 343 julong result = julong(a) * b / div; 344 assert(result <= (size_t)max_uintx, "Integer overflow in lcm"); 345 346 return size_t(result); 347 }