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 == 11, "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_ADDRESS: // random raw pointer
112 case T_METADATA: // metadata pointer
113 case T_NARROWOOP: // compressed pointer
114 case T_NARROWKLASS: // compressed klass pointer
115 case T_CONFLICT: // might as well support a bottom type
116 case T_VOID: // padding or other unaddressed word
117 // layout type must map to itself
118 assert(vt == ft, "");
119 break;
120 default:
121 // non-layout type must map to a (different) layout type
122 assert(vt != ft, "");
123 assert(ft == type2field[ft], "");
124 }
125 // every type must map to same-sized layout type:
126 assert(type2size[vt] == type2size[ft], "");
127 }
128 }
129 // These are assumed, e.g., when filling HeapWords with juints.
130 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
131 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
132 assert((size_t)HeapWordSize >= sizeof(juint),
133 "HeapWord should be at least as large as juint");
134 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
135 #endif
136
137 if( JavaPriority1_To_OSPriority != -1 )
138 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
139 if( JavaPriority2_To_OSPriority != -1 )
140 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
141 if( JavaPriority3_To_OSPriority != -1 )
142 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
143 if( JavaPriority4_To_OSPriority != -1 )
144 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
145 if( JavaPriority5_To_OSPriority != -1 )
146 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
147 if( JavaPriority6_To_OSPriority != -1 )
148 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
149 if( JavaPriority7_To_OSPriority != -1 )
150 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
151 if( JavaPriority8_To_OSPriority != -1 )
152 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
153 if( JavaPriority9_To_OSPriority != -1 )
154 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
155 if(JavaPriority10_To_OSPriority != -1 )
156 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
157
158 // Set the size of basic types here (after argument parsing but before
159 // stub generation).
160 if (UseCompressedOops) {
161 // Size info for oops within java objects is fixed
162 heapOopSize = jintSize;
163 LogBytesPerHeapOop = LogBytesPerInt;
164 LogBitsPerHeapOop = LogBitsPerInt;
165 BytesPerHeapOop = BytesPerInt;
166 BitsPerHeapOop = BitsPerInt;
167 } else {
168 heapOopSize = oopSize;
169 LogBytesPerHeapOop = LogBytesPerWord;
170 LogBitsPerHeapOop = LogBitsPerWord;
171 BytesPerHeapOop = BytesPerWord;
172 BitsPerHeapOop = BitsPerWord;
173 }
174 _type2aelembytes[T_OBJECT] = heapOopSize;
175 _type2aelembytes[T_ARRAY] = heapOopSize;
176 }
177
178
179 // Map BasicType to signature character
180 char type2char_tab[T_CONFLICT+1]={ 0, 0, 0, 0, 'Z', 'C', 'F', 'D', 'B', 'S', 'I', 'J', 'L', '[', 'V', 0, 0, 0, 0, 0};
181
182 // Map BasicType to Java type name
183 const char* type2name_tab[T_CONFLICT+1] = {
184 NULL, NULL, NULL, NULL,
185 "boolean",
186 "char",
187 "float",
188 "double",
189 "byte",
190 "short",
191 "int",
192 "long",
193 "object",
194 "array",
195 "void",
196 "*address*",
197 "*narrowoop*",
198 "*metadata*",
199 "*narrowklass*",
200 "*conflict*"
201 };
202
203
204 BasicType name2type(const char* name) {
205 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
206 BasicType t = (BasicType)i;
207 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))
208 return t;
209 }
210 return T_ILLEGAL;
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, 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_METADATA, // T_METADATA = 17,
235 T_NARROWKLASS, // T_NARROWKLASS = 18,
236 T_CONFLICT // T_CONFLICT = 19,
237 };
238
239
240 BasicType type2wfield[T_CONFLICT+1] = {
241 (BasicType)0, // 0,
242 (BasicType)0, // 1,
243 (BasicType)0, // 2,
244 (BasicType)0, // 3,
245 T_INT, // T_BOOLEAN = 4,
246 T_INT, // T_CHAR = 5,
247 T_FLOAT, // T_FLOAT = 6,
248 T_DOUBLE, // T_DOUBLE = 7,
249 T_INT, // T_BYTE = 8,
250 T_INT, // T_SHORT = 9,
251 T_INT, // T_INT = 10,
252 T_LONG, // T_LONG = 11,
253 T_OBJECT, // T_OBJECT = 12,
254 T_OBJECT, // T_ARRAY = 13,
255 T_VOID, // T_VOID = 14,
256 T_ADDRESS, // T_ADDRESS = 15,
257 T_NARROWOOP, // T_NARROWOOP = 16,
258 T_METADATA, // T_METADATA = 17,
259 T_NARROWKLASS, // T_NARROWKLASS = 18,
260 T_CONFLICT // T_CONFLICT = 19,
261 };
262
263
264 int _type2aelembytes[T_CONFLICT+1] = {
265 0, // 0
266 0, // 1
267 0, // 2
268 0, // 3
269 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
270 T_CHAR_aelem_bytes, // T_CHAR = 5,
271 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
272 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
273 T_BYTE_aelem_bytes, // T_BYTE = 8,
274 T_SHORT_aelem_bytes, // T_SHORT = 9,
275 T_INT_aelem_bytes, // T_INT = 10,
276 T_LONG_aelem_bytes, // T_LONG = 11,
277 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
278 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
279 0, // T_VOID = 14,
280 T_OBJECT_aelem_bytes, // T_ADDRESS = 15,
281 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 16,
282 T_OBJECT_aelem_bytes, // T_METADATA = 17,
283 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 18,
284 0 // T_CONFLICT = 19,
285 };
286
287 #ifdef ASSERT
288 int type2aelembytes(BasicType t, bool allow_address) {
289 assert(allow_address || t != T_ADDRESS, " ");
290 return _type2aelembytes[t];
291 }
292 #endif
293
294 // Support for 64-bit integer arithmetic
295
296 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
297
298 static const jlong high_bit = (jlong)1 << (jlong)63;
299 static const jlong other_bits = ~high_bit;
300
301 jlong float2long(jfloat f) {
302 jlong tmp = (jlong) f;
303 if (tmp != high_bit) {
304 return tmp;
305 } else {
306 if (g_isnan((jdouble)f)) {
307 return 0;
308 }
309 if (f < 0) {
310 return high_bit;
311 } else {
312 return other_bits;
313 }
314 }
315 }
316
317
318 jlong double2long(jdouble f) {
319 jlong tmp = (jlong) f;
320 if (tmp != high_bit) {
321 return tmp;
322 } else {
323 if (g_isnan(f)) {
324 return 0;
325 }
326 if (f < 0) {
327 return high_bit;
328 } else {
329 return other_bits;
330 }
331 }
332 }
333
334 // least common multiple
335 size_t lcm(size_t a, size_t b) {
336 size_t cur, div, next;
337
338 cur = MAX2(a, b);
339 div = MIN2(a, b);
340
341 assert(div != 0, "lcm requires positive arguments");
342
343
344 while ((next = cur % div) != 0) {
345 cur = div; div = next;
346 }
347
348
349 julong result = julong(a) * b / div;
350 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
351
352 return size_t(result);
353 }
354
355
356 // Test that nth_bit macro and friends behave as
357 // expected, even with low-precedence operators.
358
359 STATIC_ASSERT(nth_bit(3) == 0x8);
360 STATIC_ASSERT(nth_bit(1|2) == 0x8);
361
362 STATIC_ASSERT(right_n_bits(3) == 0x7);
363 STATIC_ASSERT(right_n_bits(1|2) == 0x7);
364
365 STATIC_ASSERT(left_n_bits(3) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));
366 STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));