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 == 12, "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_PRIMITIVE_OBJECT:
140 case T_ADDRESS: // random raw pointer
141 case T_METADATA: // metadata pointer
142 case T_NARROWOOP: // compressed pointer
143 case T_NARROWKLASS: // compressed klass pointer
144 case T_CONFLICT: // might as well support a bottom type
145 case T_VOID: // padding or other unaddressed word
146 // layout type must map to itself
147 assert(vt == ft, "");
148 break;
149 default:
150 // non-layout type must map to a (different) layout type
151 assert(vt != ft, "");
152 assert(ft == type2field[ft], "");
153 }
154 // every type must map to same-sized layout type:
155 assert(type2size[vt] == type2size[ft], "");
156 }
157 }
158 // These are assumed, e.g., when filling HeapWords with juints.
159 static_assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
160 static_assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
161 static_assert((size_t)HeapWordSize >= sizeof(juint),
162 "HeapWord should be at least as large as juint");
163 static_assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
164 #endif
165
166 if( JavaPriority1_To_OSPriority != -1 )
167 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
168 if( JavaPriority2_To_OSPriority != -1 )
169 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
170 if( JavaPriority3_To_OSPriority != -1 )
171 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
172 if( JavaPriority4_To_OSPriority != -1 )
173 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
174 if( JavaPriority5_To_OSPriority != -1 )
175 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
176 if( JavaPriority6_To_OSPriority != -1 )
177 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
178 if( JavaPriority7_To_OSPriority != -1 )
179 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
180 if( JavaPriority8_To_OSPriority != -1 )
181 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
182 if( JavaPriority9_To_OSPriority != -1 )
183 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
184 if(JavaPriority10_To_OSPriority != -1 )
185 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
186
187 // Set the size of basic types here (after argument parsing but before
188 // stub generation).
189 if (UseCompressedOops) {
190 // Size info for oops within java objects is fixed
191 heapOopSize = jintSize;
192 LogBytesPerHeapOop = LogBytesPerInt;
193 LogBitsPerHeapOop = LogBitsPerInt;
194 BytesPerHeapOop = BytesPerInt;
195 BitsPerHeapOop = BitsPerInt;
196 } else {
197 heapOopSize = oopSize;
198 LogBytesPerHeapOop = LogBytesPerWord;
199 LogBitsPerHeapOop = LogBitsPerWord;
200 BytesPerHeapOop = BytesPerWord;
201 BitsPerHeapOop = BitsPerWord;
202 }
203 _type2aelembytes[T_OBJECT] = heapOopSize;
204 _type2aelembytes[T_ARRAY] = heapOopSize;
205 _type2aelembytes[T_PRIMITIVE_OBJECT] = heapOopSize;
206 }
207
208
209 // Map BasicType to signature character
210 char type2char_tab[T_CONFLICT+1] = {
211 0, 0, 0, 0,
212 JVM_SIGNATURE_BOOLEAN, JVM_SIGNATURE_CHAR,
213 JVM_SIGNATURE_FLOAT, JVM_SIGNATURE_DOUBLE,
214 JVM_SIGNATURE_BYTE, JVM_SIGNATURE_SHORT,
215 JVM_SIGNATURE_INT, JVM_SIGNATURE_LONG,
216 JVM_SIGNATURE_CLASS, JVM_SIGNATURE_ARRAY,
217 JVM_SIGNATURE_PRIMITIVE_OBJECT, JVM_SIGNATURE_VOID,
218 0, 0, 0, 0, 0
219 };
220
221 // Map BasicType to Java type name
222 const char* type2name_tab[T_CONFLICT+1] = {
223 nullptr, nullptr, nullptr, nullptr,
224 "boolean",
225 "char",
226 "float",
227 "double",
228 "byte",
229 "short",
230 "int",
231 "long",
232 "object",
233 "array",
234 "inline_type",
235 "void",
236 "*address*",
237 "*narrowoop*",
238 "*metadata*",
239 "*narrowklass*",
240 "*conflict*"
241 };
242 const char* type2name(BasicType t) {
243 if (t < ARRAY_SIZE(type2name_tab)) {
244 return type2name_tab[t];
245 } else if (t == T_ILLEGAL) {
246 return "*illegal*";
247 } else {
248 fatal("invalid type %d", t);
249 return "invalid type";
250 }
251 }
252
253
254
255 BasicType name2type(const char* name) {
256 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
257 BasicType t = (BasicType)i;
258 if (type2name_tab[t] != nullptr && 0 == strcmp(type2name_tab[t], name))
259 return t;
260 }
261 return T_ILLEGAL;
262 }
263
264 // Map BasicType to size in words
265 int type2size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 0, 1, 1, 1, 1, -1};
266
267 BasicType type2field[T_CONFLICT+1] = {
268 (BasicType)0, // 0,
269 (BasicType)0, // 1,
270 (BasicType)0, // 2,
271 (BasicType)0, // 3,
272 T_BOOLEAN, // T_BOOLEAN = 4,
273 T_CHAR, // T_CHAR = 5,
274 T_FLOAT, // T_FLOAT = 6,
275 T_DOUBLE, // T_DOUBLE = 7,
276 T_BYTE, // T_BYTE = 8,
277 T_SHORT, // T_SHORT = 9,
278 T_INT, // T_INT = 10,
279 T_LONG, // T_LONG = 11,
280 T_OBJECT, // T_OBJECT = 12,
281 T_OBJECT, // T_ARRAY = 13,
282 T_PRIMITIVE_OBJECT, // T_PRIMITIVE_OBJECT = 14,
283 T_VOID, // T_VOID = 15,
284 T_ADDRESS, // T_ADDRESS = 16,
285 T_NARROWOOP, // T_NARROWOOP= 17,
286 T_METADATA, // T_METADATA = 18,
287 T_NARROWKLASS, // T_NARROWKLASS = 19,
288 T_CONFLICT // T_CONFLICT = 20
289 };
290
291
292 BasicType type2wfield[T_CONFLICT+1] = {
293 (BasicType)0, // 0,
294 (BasicType)0, // 1,
295 (BasicType)0, // 2,
296 (BasicType)0, // 3,
297 T_INT, // T_BOOLEAN = 4,
298 T_INT, // T_CHAR = 5,
299 T_FLOAT, // T_FLOAT = 6,
300 T_DOUBLE, // T_DOUBLE = 7,
301 T_INT, // T_BYTE = 8,
302 T_INT, // T_SHORT = 9,
303 T_INT, // T_INT = 10,
304 T_LONG, // T_LONG = 11,
305 T_OBJECT, // T_OBJECT = 12,
306 T_OBJECT, // T_ARRAY = 13,
307 T_OBJECT, // T_PRIMITIVE_OBJECT = 14,
308 T_VOID, // T_VOID = 15,
309 T_ADDRESS, // T_ADDRESS = 16,
310 T_NARROWOOP, // T_NARROWOOP = 17,
311 T_METADATA, // T_METADATA = 18,
312 T_NARROWKLASS, // T_NARROWKLASS = 19,
313 T_CONFLICT // T_CONFLICT = 20
314 };
315
316
317 int _type2aelembytes[T_CONFLICT+1] = {
318 0, // 0
319 0, // 1
320 0, // 2
321 0, // 3
322 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
323 T_CHAR_aelem_bytes, // T_CHAR = 5,
324 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
325 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
326 T_BYTE_aelem_bytes, // T_BYTE = 8,
327 T_SHORT_aelem_bytes, // T_SHORT = 9,
328 T_INT_aelem_bytes, // T_INT = 10,
329 T_LONG_aelem_bytes, // T_LONG = 11,
330 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
331 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
332 T_PRIMITIVE_OBJECT_aelem_bytes, // T_PRIMITIVE_OBJECT = 14,
333 0, // T_VOID = 15,
334 T_OBJECT_aelem_bytes, // T_ADDRESS = 16,
335 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 17,
336 T_OBJECT_aelem_bytes, // T_METADATA = 18,
337 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 19,
338 0 // T_CONFLICT = 20
339 };
340
341 #ifdef ASSERT
342 int type2aelembytes(BasicType t, bool allow_address) {
343 assert((allow_address || t != T_ADDRESS) && t <= T_CONFLICT, "unexpected basic type");
344 return _type2aelembytes[t];
345 }
346 #endif
347
348 // Support for 64-bit integer arithmetic
349
350 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
351
352 static const jlong high_bit = (jlong)1 << (jlong)63;
353 static const jlong other_bits = ~high_bit;
354
355 jlong float2long(jfloat f) {
356 jlong tmp = (jlong) f;
357 if (tmp != high_bit) {
358 return tmp;
359 } else {
360 if (g_isnan((jdouble)f)) {
361 return 0;
362 }
363 if (f < 0) {
364 return high_bit;
365 } else {
366 return other_bits;
367 }
368 }
369 }
370
371
372 jlong double2long(jdouble f) {
373 jlong tmp = (jlong) f;
374 if (tmp != high_bit) {
375 return tmp;
376 } else {
377 if (g_isnan(f)) {
378 return 0;
379 }
380 if (f < 0) {
381 return high_bit;
382 } else {
383 return other_bits;
384 }
385 }
386 }
387
388 // least common multiple
389 size_t lcm(size_t a, size_t b) {
390 size_t cur, div, next;
391
392 cur = MAX2(a, b);
393 div = MIN2(a, b);
394
395 assert(div != 0, "lcm requires positive arguments");
396
397
398 while ((next = cur % div) != 0) {
399 cur = div; div = next;
400 }
401
402
403 julong result = julong(a) * b / div;
404 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
405
406 return size_t(result);
407 }
408
409
410 // Test that nth_bit macro and friends behave as
411 // expected, even with low-precedence operators.
412
413 STATIC_ASSERT(nth_bit(3) == 0x8);
414 STATIC_ASSERT(nth_bit(1|2) == 0x8);
415
416 STATIC_ASSERT(right_n_bits(3) == 0x7);
417 STATIC_ASSERT(right_n_bits(1|2) == 0x7);