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 #include "precompiled.hpp"
26 #include "runtime/globals.hpp"
27 #include "runtime/os.hpp"
28 #include "runtime/signature.hpp"
29 #include "utilities/globalDefinitions.hpp"
30
31 // Basic error support
32
33 // Info for oops within a java object. Defaults are zero so
34 // things will break badly if incorrectly initialized.
35 int heapOopSize = 0;
36 int LogBytesPerHeapOop = 0;
37 int LogBitsPerHeapOop = 0;
38 int BytesPerHeapOop = 0;
39 int BitsPerHeapOop = 0;
40
41 // Object alignment, in units of HeapWords.
42 // Defaults are -1 so things will break badly if incorrectly initialized.
43 int MinObjAlignment = -1;
44 int MinObjAlignmentInBytes = -1;
45 int MinObjAlignmentInBytesMask = 0;
46
47 int LogMinObjAlignment = -1;
48 int LogMinObjAlignmentInBytes = -1;
49
50 // Oop encoding heap max
51 uint64_t OopEncodingHeapMax = 0;
52
53 // Something to help porters sleep at night
54
55 #ifdef ASSERT
56 BasicType char2type(int ch) {
57 switch (ch) {
58 #define EACH_SIG(ch, bt, ignore) \
59 case ch: return bt;
60 SIGNATURE_TYPES_DO(EACH_SIG, ignore)
61 #undef EACH_SIG
62 }
63 return T_ILLEGAL;
64 }
65
66 extern bool signature_constants_sane();
67 #endif //ASSERT
68
69 void basic_types_init() {
70 #ifdef ASSERT
71 #ifdef _LP64
72 assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant");
73 assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");
74 assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");
75 assert( 8 == sizeof( intx), "wrong size for basic type");
76 assert( 8 == sizeof( jobject), "wrong size for basic type");
77 #else
78 assert(min_intx == (intx)0x80000000, "correct constant");
79 assert(max_intx == 0x7FFFFFFF, "correct constant");
80 assert(max_uintx == 0xFFFFFFFF, "correct constant");
81 assert( 4 == sizeof( intx), "wrong size for basic type");
82 assert( 4 == sizeof( jobject), "wrong size for basic type");
83 #endif
84 assert( (~max_juint) == 0, "max_juint has all its bits");
85 assert( (~max_uintx) == 0, "max_uintx has all its bits");
86 assert( (~max_julong) == 0, "max_julong has all its bits");
87 assert( 1 == sizeof( jbyte), "wrong size for basic type");
88 assert( 2 == sizeof( jchar), "wrong size for basic type");
89 assert( 2 == sizeof( jshort), "wrong size for basic type");
90 assert( 4 == sizeof( juint), "wrong size for basic type");
91 assert( 4 == sizeof( jint), "wrong size for basic type");
92 assert( 1 == sizeof( jboolean), "wrong size for basic type");
93 assert( 8 == sizeof( jlong), "wrong size for basic type");
94 assert( 4 == sizeof( jfloat), "wrong size for basic type");
95 assert( 8 == sizeof( jdouble), "wrong size for basic type");
96 assert( 1 == sizeof( u1), "wrong size for basic type");
97 assert( 2 == sizeof( u2), "wrong size for basic type");
98 assert( 4 == sizeof( u4), "wrong size for basic type");
99 assert(wordSize == BytesPerWord, "should be the same since they're used interchangeably");
100 assert(wordSize == HeapWordSize, "should be the same since they're also used interchangeably");
101
102 assert(signature_constants_sane(), "");
103
104 int num_type_chars = 0;
105 for (int i = 0; i < 99; i++) {
106 if (type2char((BasicType)i) != 0) {
107 assert(char2type(type2char((BasicType)i)) == i, "proper inverses");
108 assert(Signature::basic_type(type2char((BasicType)i)) == i, "proper inverses");
109 num_type_chars++;
110 }
111 }
112 assert(num_type_chars == 11, "must have tested the right number of mappings");
113 assert(char2type(0) == T_ILLEGAL, "correct illegality");
114
115 {
116 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
117 BasicType vt = (BasicType)i;
118 BasicType ft = type2field[vt];
119 switch (vt) {
120 // the following types might plausibly show up in memory layouts:
121 case T_BOOLEAN:
122 case T_BYTE:
123 case T_CHAR:
124 case T_SHORT:
125 case T_INT:
126 case T_FLOAT:
127 case T_DOUBLE:
128 case T_LONG:
129 case T_OBJECT:
130 case T_ADDRESS: // random raw pointer
131 case T_METADATA: // metadata pointer
132 case T_NARROWOOP: // compressed pointer
133 case T_NARROWKLASS: // compressed klass pointer
134 case T_CONFLICT: // might as well support a bottom type
135 case T_VOID: // padding or other unaddressed word
136 // layout type must map to itself
137 assert(vt == ft, "");
138 break;
139 default:
140 // non-layout type must map to a (different) layout type
141 assert(vt != ft, "");
142 assert(ft == type2field[ft], "");
143 }
144 // every type must map to same-sized layout type:
145 assert(type2size[vt] == type2size[ft], "");
146 }
147 }
148 // These are assumed, e.g., when filling HeapWords with juints.
149 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
150 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
151 assert((size_t)HeapWordSize >= sizeof(juint),
152 "HeapWord should be at least as large as juint");
153 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
154 #endif
155
156 if( JavaPriority1_To_OSPriority != -1 )
157 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
158 if( JavaPriority2_To_OSPriority != -1 )
159 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
160 if( JavaPriority3_To_OSPriority != -1 )
161 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
162 if( JavaPriority4_To_OSPriority != -1 )
163 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
164 if( JavaPriority5_To_OSPriority != -1 )
165 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
166 if( JavaPriority6_To_OSPriority != -1 )
167 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
168 if( JavaPriority7_To_OSPriority != -1 )
169 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
170 if( JavaPriority8_To_OSPriority != -1 )
171 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
172 if( JavaPriority9_To_OSPriority != -1 )
173 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
174 if(JavaPriority10_To_OSPriority != -1 )
175 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
176
177 // Set the size of basic types here (after argument parsing but before
178 // stub generation).
179 if (UseCompressedOops) {
180 // Size info for oops within java objects is fixed
181 heapOopSize = jintSize;
182 LogBytesPerHeapOop = LogBytesPerInt;
183 LogBitsPerHeapOop = LogBitsPerInt;
184 BytesPerHeapOop = BytesPerInt;
185 BitsPerHeapOop = BitsPerInt;
186 } else {
187 heapOopSize = oopSize;
188 LogBytesPerHeapOop = LogBytesPerWord;
189 LogBitsPerHeapOop = LogBitsPerWord;
190 BytesPerHeapOop = BytesPerWord;
191 BitsPerHeapOop = BitsPerWord;
192 }
193 _type2aelembytes[T_OBJECT] = heapOopSize;
194 _type2aelembytes[T_ARRAY] = heapOopSize;
195 }
196
197
198 // Map BasicType to signature character
199 char type2char_tab[T_CONFLICT+1] = {
200 0, 0, 0, 0,
201 JVM_SIGNATURE_BOOLEAN, JVM_SIGNATURE_CHAR,
202 JVM_SIGNATURE_FLOAT, JVM_SIGNATURE_DOUBLE,
203 JVM_SIGNATURE_BYTE, JVM_SIGNATURE_SHORT,
204 JVM_SIGNATURE_INT, JVM_SIGNATURE_LONG,
205 JVM_SIGNATURE_CLASS, JVM_SIGNATURE_ARRAY,
206 JVM_SIGNATURE_VOID, 0,
207 0, 0, 0, 0
208 };
209
210 // Map BasicType to Java type name
211 const char* type2name_tab[T_CONFLICT+1] = {
212 NULL, NULL, NULL, NULL,
213 "boolean",
214 "char",
215 "float",
216 "double",
217 "byte",
218 "short",
219 "int",
220 "long",
221 "object",
222 "array",
223 "void",
224 "*address*",
225 "*narrowoop*",
226 "*metadata*",
227 "*narrowklass*",
228 "*conflict*"
229 };
230
231
232 BasicType name2type(const char* name) {
233 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
234 BasicType t = (BasicType)i;
235 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))
236 return t;
237 }
238 return T_ILLEGAL;
239 }
240
241 // Map BasicType to size in words
242 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};
243
244 BasicType type2field[T_CONFLICT+1] = {
245 (BasicType)0, // 0,
246 (BasicType)0, // 1,
247 (BasicType)0, // 2,
248 (BasicType)0, // 3,
249 T_BOOLEAN, // T_BOOLEAN = 4,
250 T_CHAR, // T_CHAR = 5,
251 T_FLOAT, // T_FLOAT = 6,
252 T_DOUBLE, // T_DOUBLE = 7,
253 T_BYTE, // T_BYTE = 8,
254 T_SHORT, // T_SHORT = 9,
255 T_INT, // T_INT = 10,
256 T_LONG, // T_LONG = 11,
257 T_OBJECT, // T_OBJECT = 12,
258 T_OBJECT, // T_ARRAY = 13,
259 T_VOID, // T_VOID = 14,
260 T_ADDRESS, // T_ADDRESS = 15,
261 T_NARROWOOP, // T_NARROWOOP= 16,
262 T_METADATA, // T_METADATA = 17,
263 T_NARROWKLASS, // T_NARROWKLASS = 18,
264 T_CONFLICT // T_CONFLICT = 19,
265 };
266
267
268 BasicType type2wfield[T_CONFLICT+1] = {
269 (BasicType)0, // 0,
270 (BasicType)0, // 1,
271 (BasicType)0, // 2,
272 (BasicType)0, // 3,
273 T_INT, // T_BOOLEAN = 4,
274 T_INT, // T_CHAR = 5,
275 T_FLOAT, // T_FLOAT = 6,
276 T_DOUBLE, // T_DOUBLE = 7,
277 T_INT, // T_BYTE = 8,
278 T_INT, // T_SHORT = 9,
279 T_INT, // T_INT = 10,
280 T_LONG, // T_LONG = 11,
281 T_OBJECT, // T_OBJECT = 12,
282 T_OBJECT, // T_ARRAY = 13,
283 T_VOID, // T_VOID = 14,
284 T_ADDRESS, // T_ADDRESS = 15,
285 T_NARROWOOP, // T_NARROWOOP = 16,
286 T_METADATA, // T_METADATA = 17,
287 T_NARROWKLASS, // T_NARROWKLASS = 18,
288 T_CONFLICT // T_CONFLICT = 19,
289 };
290
291
292 int _type2aelembytes[T_CONFLICT+1] = {
293 0, // 0
294 0, // 1
295 0, // 2
296 0, // 3
297 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
298 T_CHAR_aelem_bytes, // T_CHAR = 5,
299 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
300 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
301 T_BYTE_aelem_bytes, // T_BYTE = 8,
302 T_SHORT_aelem_bytes, // T_SHORT = 9,
303 T_INT_aelem_bytes, // T_INT = 10,
304 T_LONG_aelem_bytes, // T_LONG = 11,
305 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
306 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
307 0, // T_VOID = 14,
308 T_OBJECT_aelem_bytes, // T_ADDRESS = 15,
309 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 16,
310 T_OBJECT_aelem_bytes, // T_METADATA = 17,
311 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 18,
312 0 // T_CONFLICT = 19,
313 };
314
315 #ifdef ASSERT
316 int type2aelembytes(BasicType t, bool allow_address) {
317 assert(allow_address || t != T_ADDRESS, " ");
318 return _type2aelembytes[t];
319 }
320 #endif
321
322 // Support for 64-bit integer arithmetic
323
324 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
325
326 static const jlong high_bit = (jlong)1 << (jlong)63;
327 static const jlong other_bits = ~high_bit;
328
329 jlong float2long(jfloat f) {
330 jlong tmp = (jlong) f;
331 if (tmp != high_bit) {
332 return tmp;
333 } else {
334 if (g_isnan((jdouble)f)) {
335 return 0;
336 }
337 if (f < 0) {
338 return high_bit;
339 } else {
340 return other_bits;
341 }
342 }
343 }
344
345
346 jlong double2long(jdouble f) {
347 jlong tmp = (jlong) f;
348 if (tmp != high_bit) {
349 return tmp;
350 } else {
351 if (g_isnan(f)) {
352 return 0;
353 }
354 if (f < 0) {
355 return high_bit;
356 } else {
357 return other_bits;
358 }
359 }
360 }
361
362 // least common multiple
363 size_t lcm(size_t a, size_t b) {
364 size_t cur, div, next;
365
366 cur = MAX2(a, b);
367 div = MIN2(a, b);
368
369 assert(div != 0, "lcm requires positive arguments");
370
371
372 while ((next = cur % div) != 0) {
373 cur = div; div = next;
374 }
375
376
377 julong result = julong(a) * b / div;
378 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
379
380 return size_t(result);
381 }
382
383
384 // Test that nth_bit macro and friends behave as
385 // expected, even with low-precedence operators.
386
387 STATIC_ASSERT(nth_bit(3) == 0x8);
388 STATIC_ASSERT(nth_bit(1|2) == 0x8);
389
390 STATIC_ASSERT(right_n_bits(3) == 0x7);
391 STATIC_ASSERT(right_n_bits(1|2) == 0x7);
392
393 STATIC_ASSERT(left_n_bits(3) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));
394 STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));