1 /*
2 * Copyright (c) 1997, 2018, 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
29 // Basic error support
30
31 // Info for oops within a java object. Defaults are zero so
32 // things will break badly if incorrectly initialized.
33 int heapOopSize = 0;
34 int LogBytesPerHeapOop = 0;
35 int LogBitsPerHeapOop = 0;
36 int BytesPerHeapOop = 0;
37 int BitsPerHeapOop = 0;
38
39 // Object alignment, in units of HeapWords.
40 // Defaults are -1 so things will break badly if incorrectly initialized.
41 int MinObjAlignment = -1;
42 int MinObjAlignmentInBytes = -1;
43 int MinObjAlignmentInBytesMask = 0;
44
45 int LogMinObjAlignment = -1;
46 int LogMinObjAlignmentInBytes = -1;
47
48 // Oop encoding heap max
49 uint64_t OopEncodingHeapMax = 0;
50
51 // Something to help porters sleep at night
52
53 void basic_types_init() {
54 #ifdef ASSERT
55 #ifdef _LP64
56 assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant");
57 assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");
58 assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");
59 assert( 8 == sizeof( intx), "wrong size for basic type");
60 assert( 8 == sizeof( jobject), "wrong size for basic type");
61 #else
62 assert(min_intx == (intx)0x80000000, "correct constant");
63 assert(max_intx == 0x7FFFFFFF, "correct constant");
64 assert(max_uintx == 0xFFFFFFFF, "correct constant");
65 assert( 4 == sizeof( intx), "wrong size for basic type");
66 assert( 4 == sizeof( jobject), "wrong size for basic type");
67 #endif
68 assert( (~max_juint) == 0, "max_juint has all its bits");
69 assert( (~max_uintx) == 0, "max_uintx has all its bits");
70 assert( (~max_julong) == 0, "max_julong has all its bits");
71 assert( 1 == sizeof( jbyte), "wrong size for basic type");
72 assert( 2 == sizeof( jchar), "wrong size for basic type");
73 assert( 2 == sizeof( jshort), "wrong size for basic type");
74 assert( 4 == sizeof( juint), "wrong size for basic type");
75 assert( 4 == sizeof( jint), "wrong size for basic type");
76 assert( 1 == sizeof( jboolean), "wrong size for basic type");
77 assert( 8 == sizeof( jlong), "wrong size for basic type");
78 assert( 4 == sizeof( jfloat), "wrong size for basic type");
79 assert( 8 == sizeof( jdouble), "wrong size for basic type");
80 assert( 1 == sizeof( u1), "wrong size for basic type");
81 assert( 2 == sizeof( u2), "wrong size for basic type");
82 assert( 4 == sizeof( u4), "wrong size for basic type");
83 assert(wordSize == BytesPerWord, "should be the same since they're used interchangeably");
84 assert(wordSize == HeapWordSize, "should be the same since they're also used interchangeably");
85
86 int num_type_chars = 0;
87 for (int i = 0; i < 99; i++) {
88 if (type2char((BasicType)i) != 0) {
89 assert(char2type(type2char((BasicType)i)) == i, "proper inverses");
90 num_type_chars++;
91 }
92 }
93 assert(num_type_chars == 12, "must have tested the right number of mappings");
94 assert(char2type(0) == T_ILLEGAL, "correct illegality");
95
96 {
97 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
98 BasicType vt = (BasicType)i;
99 BasicType ft = type2field[vt];
100 switch (vt) {
101 // the following types might plausibly show up in memory layouts:
102 case T_BOOLEAN:
103 case T_BYTE:
104 case T_CHAR:
105 case T_SHORT:
106 case T_INT:
107 case T_FLOAT:
108 case T_DOUBLE:
109 case T_LONG:
110 case T_OBJECT:
111 case T_VALUETYPE:
112 case T_ADDRESS: // random raw pointer
113 case T_METADATA: // metadata pointer
114 case T_NARROWOOP: // compressed pointer
115 case T_NARROWKLASS: // compressed klass pointer
116 case T_CONFLICT: // might as well support a bottom type
117 case T_VOID: // padding or other unaddressed word
118 case T_VALUETYPEPTR:
119 // layout type must map to itself
120 assert(vt == ft, "");
121 break;
122 default:
123 // non-layout type must map to a (different) layout type
124 assert(vt != ft, "");
125 assert(ft == type2field[ft], "");
126 }
127 // every type must map to same-sized layout type:
128 assert(type2size[vt] == type2size[ft], "");
129 }
130 }
131 // These are assumed, e.g., when filling HeapWords with juints.
132 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
133 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
134 assert((size_t)HeapWordSize >= sizeof(juint),
135 "HeapWord should be at least as large as juint");
136 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
137 #endif
138
139 if( JavaPriority1_To_OSPriority != -1 )
140 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
141 if( JavaPriority2_To_OSPriority != -1 )
142 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
143 if( JavaPriority3_To_OSPriority != -1 )
144 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
145 if( JavaPriority4_To_OSPriority != -1 )
146 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
147 if( JavaPriority5_To_OSPriority != -1 )
148 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
149 if( JavaPriority6_To_OSPriority != -1 )
150 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
151 if( JavaPriority7_To_OSPriority != -1 )
152 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
153 if( JavaPriority8_To_OSPriority != -1 )
154 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
155 if( JavaPriority9_To_OSPriority != -1 )
156 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
157 if(JavaPriority10_To_OSPriority != -1 )
158 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
159
160 // Set the size of basic types here (after argument parsing but before
161 // stub generation).
162 if (UseCompressedOops) {
163 // Size info for oops within java objects is fixed
164 heapOopSize = jintSize;
165 LogBytesPerHeapOop = LogBytesPerInt;
166 LogBitsPerHeapOop = LogBitsPerInt;
167 BytesPerHeapOop = BytesPerInt;
168 BitsPerHeapOop = BitsPerInt;
169 } else {
170 heapOopSize = oopSize;
171 LogBytesPerHeapOop = LogBytesPerWord;
172 LogBitsPerHeapOop = LogBitsPerWord;
173 BytesPerHeapOop = BytesPerWord;
174 BitsPerHeapOop = BitsPerWord;
175 }
176 _type2aelembytes[T_OBJECT] = heapOopSize;
177 _type2aelembytes[T_ARRAY] = heapOopSize;
178 _type2aelembytes[T_VALUETYPE] = heapOopSize;
179 }
180
181
182 // Map BasicType to signature character
183 char type2char_tab[T_CONFLICT+1]={ 0, 0, 0, 0, 'Z', 'C', 'F', 'D', 'B', 'S', 'I', 'J', 'L', '[', 'Q', 'V', 0, 0, 0, 0, 0, 0};
184
185 // Map BasicType to Java type name
186 const char* type2name_tab[T_CONFLICT+1] = {
187 NULL, NULL, NULL, NULL,
188 "boolean",
189 "char",
190 "float",
191 "double",
192 "byte",
193 "short",
194 "int",
195 "long",
196 "object",
197 "array",
198 "valuetype",
199 "void",
200 "*address*",
201 "*narrowoop*",
202 "*metadata*",
203 "*narrowklass*",
204 "valuetypeptr",
205 "*conflict*"
206 };
207
208
209 BasicType name2type(const char* name) {
210 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
211 BasicType t = (BasicType)i;
212 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))
213 return t;
214 }
215 return T_ILLEGAL;
216 }
217
218 // Map BasicType to size in words
219 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, -1};
220
221 BasicType type2field[T_CONFLICT+1] = {
222 (BasicType)0, // 0,
223 (BasicType)0, // 1,
224 (BasicType)0, // 2,
225 (BasicType)0, // 3,
226 T_BOOLEAN, // T_BOOLEAN = 4,
227 T_CHAR, // T_CHAR = 5,
228 T_FLOAT, // T_FLOAT = 6,
229 T_DOUBLE, // T_DOUBLE = 7,
230 T_BYTE, // T_BYTE = 8,
231 T_SHORT, // T_SHORT = 9,
232 T_INT, // T_INT = 10,
233 T_LONG, // T_LONG = 11,
234 T_OBJECT, // T_OBJECT = 12,
235 T_OBJECT, // T_ARRAY = 13,
236 T_VALUETYPE, // T_VALUETYPE = 14,
237 T_VOID, // T_VOID = 15,
238 T_ADDRESS, // T_ADDRESS = 16,
239 T_NARROWOOP, // T_NARROWOOP= 17,
240 T_METADATA, // T_METADATA = 18,
241 T_NARROWKLASS, // T_NARROWKLASS = 19,
242 T_VALUETYPEPTR, // T_VALUETYPEPTR = 20,
243 T_CONFLICT // T_CONFLICT = 21,
244 };
245
246
247 BasicType type2wfield[T_CONFLICT+1] = {
248 (BasicType)0, // 0,
249 (BasicType)0, // 1,
250 (BasicType)0, // 2,
251 (BasicType)0, // 3,
252 T_INT, // T_BOOLEAN = 4,
253 T_INT, // T_CHAR = 5,
254 T_FLOAT, // T_FLOAT = 6,
255 T_DOUBLE, // T_DOUBLE = 7,
256 T_INT, // T_BYTE = 8,
257 T_INT, // T_SHORT = 9,
258 T_INT, // T_INT = 10,
259 T_LONG, // T_LONG = 11,
260 T_OBJECT, // T_OBJECT = 12,
261 T_OBJECT, // T_ARRAY = 13,
262 T_VALUETYPE, // T_VALUETYPE = 14,
263 T_VOID, // T_VOID = 15,
264 T_ADDRESS, // T_ADDRESS = 16,
265 T_NARROWOOP, // T_NARROWOOP = 17,
266 T_METADATA, // T_METADATA = 18,
267 T_NARROWKLASS, // T_NARROWKLASS = 19,
268 T_VALUETYPEPTR,// T_VALUETYPEPTR = 20,
269 T_CONFLICT // T_CONFLICT = 21,
270 };
271
272
273 int _type2aelembytes[T_CONFLICT+1] = {
274 0, // 0
275 0, // 1
276 0, // 2
277 0, // 3
278 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
279 T_CHAR_aelem_bytes, // T_CHAR = 5,
280 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
281 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
282 T_BYTE_aelem_bytes, // T_BYTE = 8,
283 T_SHORT_aelem_bytes, // T_SHORT = 9,
284 T_INT_aelem_bytes, // T_INT = 10,
285 T_LONG_aelem_bytes, // T_LONG = 11,
286 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
287 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
288 T_VALUETYPE_aelem_bytes, // T_VALUETYPE = 14,
289 0, // T_VOID = 15,
290 T_OBJECT_aelem_bytes, // T_ADDRESS = 16,
291 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 17,
292 T_OBJECT_aelem_bytes, // T_METADATA = 18,
293 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 19,
294 T_VALUETYPEPTR_aelem_bytes,// T_VALUETYPEPTR = 20,
295 0 // T_CONFLICT = 21,
296 };
297
298 #ifdef ASSERT
299 int type2aelembytes(BasicType t, bool allow_address) {
300 assert(allow_address || t != T_ADDRESS, " ");
301 return _type2aelembytes[t];
302 }
303 #endif
304
305 // Support for 64-bit integer arithmetic
306
307 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
308
309 static const jlong high_bit = (jlong)1 << (jlong)63;
310 static const jlong other_bits = ~high_bit;
311
312 jlong float2long(jfloat f) {
313 jlong tmp = (jlong) f;
314 if (tmp != high_bit) {
315 return tmp;
316 } else {
317 if (g_isnan((jdouble)f)) {
318 return 0;
319 }
320 if (f < 0) {
321 return high_bit;
322 } else {
323 return other_bits;
324 }
325 }
326 }
327
328
329 jlong double2long(jdouble f) {
330 jlong tmp = (jlong) f;
331 if (tmp != high_bit) {
332 return tmp;
333 } else {
334 if (g_isnan(f)) {
335 return 0;
336 }
337 if (f < 0) {
338 return high_bit;
339 } else {
340 return other_bits;
341 }
342 }
343 }
344
345 // least common multiple
346 size_t lcm(size_t a, size_t b) {
347 size_t cur, div, next;
348
349 cur = MAX2(a, b);
350 div = MIN2(a, b);
351
352 assert(div != 0, "lcm requires positive arguments");
353
354
355 while ((next = cur % div) != 0) {
356 cur = div; div = next;
357 }
358
359
360 julong result = julong(a) * b / div;
361 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
362
363 return size_t(result);
364 }
365
366
367 // Test that nth_bit macro and friends behave as
368 // expected, even with low-precedence operators.
369
370 STATIC_ASSERT(nth_bit(3) == 0x8);
371 STATIC_ASSERT(nth_bit(1|2) == 0x8);
372
373 STATIC_ASSERT(right_n_bits(3) == 0x7);
374 STATIC_ASSERT(right_n_bits(1|2) == 0x7);
375
376 STATIC_ASSERT(left_n_bits(3) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));
377 STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));