1 /*
2 * Copyright (c) 1997, 2023, 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/globals.hpp"
27 #include "runtime/os.hpp"
28 #include "runtime/signature.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/powerOfTwo.hpp"
31
32 // Basic error support
33
34 // Info for oops within a java object. Defaults are zero so
35 // things will break badly if incorrectly initialized.
36 int heapOopSize = 0;
37 int LogBytesPerHeapOop = 0;
38 int LogBitsPerHeapOop = 0;
39 int BytesPerHeapOop = 0;
40 int BitsPerHeapOop = 0;
41
42 // Old CDS options
43 bool DumpSharedSpaces;
44 bool DynamicDumpSharedSpaces;
45 bool RequireSharedSpaces;
46 extern "C" {
47 JNIEXPORT jboolean UseSharedSpaces = true;
48 }
49
50 // Object alignment, in units of HeapWords.
51 // Defaults are -1 so things will break badly if incorrectly initialized.
52 int MinObjAlignment = -1;
53 int MinObjAlignmentInBytes = -1;
54 int MinObjAlignmentInBytesMask = 0;
55
56 int LogMinObjAlignment = -1;
57 int LogMinObjAlignmentInBytes = -1;
58
59 // Oop encoding heap max
60 uint64_t OopEncodingHeapMax = 0;
61
62 // Something to help porters sleep at night
63
64 #ifdef ASSERT
65 BasicType char2type(int ch) {
66 switch (ch) {
67 #define EACH_SIG(ch, bt, ignore) \
68 case ch: return bt;
69 SIGNATURE_TYPES_DO(EACH_SIG, ignore)
70 #undef EACH_SIG
71 }
72 return T_ILLEGAL;
73 }
74
75 extern bool signature_constants_sane();
76 #endif //ASSERT
77
78 void basic_types_init() {
79 #ifdef ASSERT
80 #ifdef _LP64
81 static_assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant");
82 static_assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");
83 static_assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");
84 static_assert( 8 == sizeof( intx), "wrong size for basic type");
85 static_assert( 8 == sizeof( jobject), "wrong size for basic type");
86 #else
87 static_assert(min_intx == (intx)0x80000000, "correct constant");
88 static_assert(max_intx == 0x7FFFFFFF, "correct constant");
89 static_assert(max_uintx == 0xFFFFFFFF, "correct constant");
90 static_assert( 4 == sizeof( intx), "wrong size for basic type");
91 static_assert( 4 == sizeof( jobject), "wrong size for basic type");
92 #endif
93 static_assert( (~max_juint) == 0, "max_juint has all its bits");
94 static_assert( (~max_uintx) == 0, "max_uintx has all its bits");
95 static_assert( (~max_julong) == 0, "max_julong has all its bits");
96 static_assert( 1 == sizeof( jbyte), "wrong size for basic type");
97 static_assert( 2 == sizeof( jchar), "wrong size for basic type");
98 static_assert( 2 == sizeof( jshort), "wrong size for basic type");
99 static_assert( 4 == sizeof( juint), "wrong size for basic type");
100 static_assert( 4 == sizeof( jint), "wrong size for basic type");
101 static_assert( 1 == sizeof( jboolean), "wrong size for basic type");
102 static_assert( 8 == sizeof( jlong), "wrong size for basic type");
103 static_assert( 4 == sizeof( jfloat), "wrong size for basic type");
104 static_assert( 8 == sizeof( jdouble), "wrong size for basic type");
105 static_assert( 1 == sizeof( u1), "wrong size for basic type");
106 static_assert( 2 == sizeof( u2), "wrong size for basic type");
107 static_assert( 4 == sizeof( u4), "wrong size for basic type");
108 static_assert(wordSize == BytesPerWord, "should be the same since they're used interchangeably");
109 static_assert(wordSize == HeapWordSize, "should be the same since they're also used interchangeably");
110
111 assert(signature_constants_sane(), "");
112
113 int num_type_chars = 0;
114 for (int i = 0; i < 99; i++) {
115 if (type2char((BasicType)i) != 0) {
116 assert(char2type(type2char((BasicType)i)) == i, "proper inverses");
117 assert(Signature::basic_type(type2char((BasicType)i)) == i, "proper inverses");
118 num_type_chars++;
119 }
120 }
121 assert(num_type_chars == 11, "must have tested the right number of mappings");
122 assert(char2type(0) == T_ILLEGAL, "correct illegality");
123
124 {
125 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
126 BasicType vt = (BasicType)i;
127 BasicType ft = type2field[vt];
128 switch (vt) {
129 // the following types might plausibly show up in memory layouts:
130 case T_BOOLEAN:
131 case T_BYTE:
132 case T_CHAR:
133 case T_SHORT:
134 case T_INT:
135 case T_FLOAT:
136 case T_DOUBLE:
137 case T_LONG:
138 case T_OBJECT:
139 case T_ADDRESS: // random raw pointer
140 case T_METADATA: // metadata pointer
141 case T_NARROWOOP: // compressed pointer
142 case T_NARROWKLASS: // compressed klass pointer
143 case T_CONFLICT: // might as well support a bottom type
144 case T_VOID: // padding or other unaddressed word
145 // layout type must map to itself
146 assert(vt == ft, "");
147 break;
148 default:
149 // non-layout type must map to a (different) layout type
150 assert(vt != ft, "");
151 assert(ft == type2field[ft], "");
152 }
153 // every type must map to same-sized layout type:
154 assert(type2size[vt] == type2size[ft], "");
155 }
156 }
157 // These are assumed, e.g., when filling HeapWords with juints.
158 static_assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
159 static_assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
160 static_assert((size_t)HeapWordSize >= sizeof(juint),
161 "HeapWord should be at least as large as juint");
162 static_assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
163 #endif
164
165 if( JavaPriority1_To_OSPriority != -1 )
166 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
167 if( JavaPriority2_To_OSPriority != -1 )
168 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
169 if( JavaPriority3_To_OSPriority != -1 )
170 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
171 if( JavaPriority4_To_OSPriority != -1 )
172 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
173 if( JavaPriority5_To_OSPriority != -1 )
174 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
175 if( JavaPriority6_To_OSPriority != -1 )
176 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
177 if( JavaPriority7_To_OSPriority != -1 )
178 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
179 if( JavaPriority8_To_OSPriority != -1 )
180 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
181 if( JavaPriority9_To_OSPriority != -1 )
182 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
183 if(JavaPriority10_To_OSPriority != -1 )
184 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
185
186 // Set the size of basic types here (after argument parsing but before
187 // stub generation).
188 if (UseCompressedOops) {
189 // Size info for oops within java objects is fixed
190 heapOopSize = jintSize;
191 LogBytesPerHeapOop = LogBytesPerInt;
192 LogBitsPerHeapOop = LogBitsPerInt;
193 BytesPerHeapOop = BytesPerInt;
194 BitsPerHeapOop = BitsPerInt;
195 } else {
196 heapOopSize = oopSize;
197 LogBytesPerHeapOop = LogBytesPerWord;
198 LogBitsPerHeapOop = LogBitsPerWord;
199 BytesPerHeapOop = BytesPerWord;
200 BitsPerHeapOop = BitsPerWord;
201 }
202 _type2aelembytes[T_OBJECT] = heapOopSize;
203 _type2aelembytes[T_ARRAY] = heapOopSize;
204 }
205
206
207 // Map BasicType to signature character
208 char type2char_tab[T_CONFLICT+1] = {
209 0, 0, 0, 0,
210 JVM_SIGNATURE_BOOLEAN, JVM_SIGNATURE_CHAR,
211 JVM_SIGNATURE_FLOAT, JVM_SIGNATURE_DOUBLE,
212 JVM_SIGNATURE_BYTE, JVM_SIGNATURE_SHORT,
213 JVM_SIGNATURE_INT, JVM_SIGNATURE_LONG,
214 JVM_SIGNATURE_CLASS, JVM_SIGNATURE_ARRAY,
215 JVM_SIGNATURE_VOID, 0,
216 0, 0, 0, 0
217 };
218
219 // Map BasicType to Java type name
220 const char* type2name_tab[T_CONFLICT+1] = {
221 nullptr, nullptr, nullptr, nullptr,
222 "boolean",
223 "char",
224 "float",
225 "double",
226 "byte",
227 "short",
228 "int",
229 "long",
230 "object",
231 "array",
232 "void",
233 "*address*",
234 "*narrowoop*",
235 "*metadata*",
236 "*narrowklass*",
237 "*conflict*"
238 };
239 const char* type2name(BasicType t) {
240 if (t < ARRAY_SIZE(type2name_tab)) {
241 return type2name_tab[t];
242 } else if (t == T_ILLEGAL) {
243 return "*illegal*";
244 } else {
245 fatal("invalid type %d", t);
246 return "invalid type";
247 }
248 }
249
250
251
252 BasicType name2type(const char* name) {
253 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
254 BasicType t = (BasicType)i;
255 if (type2name_tab[t] != nullptr && 0 == strcmp(type2name_tab[t], name))
256 return t;
257 }
258 return T_ILLEGAL;
259 }
260
261 // Map BasicType to size in words
262 int type2size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, 1, 1, 1, -1};
263
264 BasicType type2field[T_CONFLICT+1] = {
265 (BasicType)0, // 0,
266 (BasicType)0, // 1,
267 (BasicType)0, // 2,
268 (BasicType)0, // 3,
269 T_BOOLEAN, // T_BOOLEAN = 4,
270 T_CHAR, // T_CHAR = 5,
271 T_FLOAT, // T_FLOAT = 6,
272 T_DOUBLE, // T_DOUBLE = 7,
273 T_BYTE, // T_BYTE = 8,
274 T_SHORT, // T_SHORT = 9,
275 T_INT, // T_INT = 10,
276 T_LONG, // T_LONG = 11,
277 T_OBJECT, // T_OBJECT = 12,
278 T_OBJECT, // T_ARRAY = 13,
279 T_VOID, // T_VOID = 14,
280 T_ADDRESS, // T_ADDRESS = 15,
281 T_NARROWOOP, // T_NARROWOOP= 16,
282 T_METADATA, // T_METADATA = 17,
283 T_NARROWKLASS, // T_NARROWKLASS = 18,
284 T_CONFLICT // T_CONFLICT = 19,
285 };
286
287
288 BasicType type2wfield[T_CONFLICT+1] = {
289 (BasicType)0, // 0,
290 (BasicType)0, // 1,
291 (BasicType)0, // 2,
292 (BasicType)0, // 3,
293 T_INT, // T_BOOLEAN = 4,
294 T_INT, // T_CHAR = 5,
295 T_FLOAT, // T_FLOAT = 6,
296 T_DOUBLE, // T_DOUBLE = 7,
297 T_INT, // T_BYTE = 8,
298 T_INT, // T_SHORT = 9,
299 T_INT, // T_INT = 10,
300 T_LONG, // T_LONG = 11,
301 T_OBJECT, // T_OBJECT = 12,
302 T_OBJECT, // T_ARRAY = 13,
303 T_VOID, // T_VOID = 14,
304 T_ADDRESS, // T_ADDRESS = 15,
305 T_NARROWOOP, // T_NARROWOOP = 16,
306 T_METADATA, // T_METADATA = 17,
307 T_NARROWKLASS, // T_NARROWKLASS = 18,
308 T_CONFLICT // T_CONFLICT = 19,
309 };
310
311
312 int _type2aelembytes[T_CONFLICT+1] = {
313 0, // 0
314 0, // 1
315 0, // 2
316 0, // 3
317 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
318 T_CHAR_aelem_bytes, // T_CHAR = 5,
319 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
320 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
321 T_BYTE_aelem_bytes, // T_BYTE = 8,
322 T_SHORT_aelem_bytes, // T_SHORT = 9,
323 T_INT_aelem_bytes, // T_INT = 10,
324 T_LONG_aelem_bytes, // T_LONG = 11,
325 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
326 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
327 0, // T_VOID = 14,
328 T_OBJECT_aelem_bytes, // T_ADDRESS = 15,
329 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 16,
330 T_OBJECT_aelem_bytes, // T_METADATA = 17,
331 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 18,
332 0 // T_CONFLICT = 19,
333 };
334
335 #ifdef ASSERT
336 int type2aelembytes(BasicType t, bool allow_address) {
337 assert((allow_address || t != T_ADDRESS) && t <= T_CONFLICT, "unexpected basic type");
338 return _type2aelembytes[t];
339 }
340 #endif
341
342 // Support for 64-bit integer arithmetic
343
344 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
345
346 static const jlong high_bit = (jlong)1 << (jlong)63;
347 static const jlong other_bits = ~high_bit;
348
349 jlong float2long(jfloat f) {
350 jlong tmp = (jlong) f;
351 if (tmp != high_bit) {
352 return tmp;
353 } else {
354 if (g_isnan((jdouble)f)) {
355 return 0;
356 }
357 if (f < 0) {
358 return high_bit;
359 } else {
360 return other_bits;
361 }
362 }
363 }
364
365
366 jlong double2long(jdouble f) {
367 jlong tmp = (jlong) f;
368 if (tmp != high_bit) {
369 return tmp;
370 } else {
371 if (g_isnan(f)) {
372 return 0;
373 }
374 if (f < 0) {
375 return high_bit;
376 } else {
377 return other_bits;
378 }
379 }
380 }
381
382 // least common multiple
383 size_t lcm(size_t a, size_t b) {
384 size_t cur, div, next;
385
386 cur = MAX2(a, b);
387 div = MIN2(a, b);
388
389 assert(div != 0, "lcm requires positive arguments");
390
391
392 while ((next = cur % div) != 0) {
393 cur = div; div = next;
394 }
395
396
397 julong result = julong(a) * b / div;
398 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
399
400 return size_t(result);
401 }
402
403
404 // Test that nth_bit macro and friends behave as
405 // expected, even with low-precedence operators.
406
407 STATIC_ASSERT(nth_bit(3) == 0x8);
408 STATIC_ASSERT(nth_bit(1|2) == 0x8);
409
410 STATIC_ASSERT(right_n_bits(3) == 0x7);
411 STATIC_ASSERT(right_n_bits(1|2) == 0x7);