1 /*
2 * Copyright (c) 1997, 2016, 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 void basic_fatal(const char* msg) {
52 fatal("%s", msg);
53 }
54
55 // Something to help porters sleep at night
56
57 void basic_types_init() {
58 #ifdef ASSERT
59 #ifdef _LP64
60 assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant");
61 assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");
62 assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");
63 assert( 8 == sizeof( intx), "wrong size for basic type");
64 assert( 8 == sizeof( jobject), "wrong size for basic type");
65 #else
66 assert(min_intx == (intx)0x80000000, "correct constant");
67 assert(max_intx == 0x7FFFFFFF, "correct constant");
68 assert(max_uintx == 0xFFFFFFFF, "correct constant");
69 assert( 4 == sizeof( intx), "wrong size for basic type");
70 assert( 4 == sizeof( jobject), "wrong size for basic type");
71 #endif
72 assert( (~max_juint) == 0, "max_juint has all its bits");
73 assert( (~max_uintx) == 0, "max_uintx has all its bits");
74 assert( (~max_julong) == 0, "max_julong has all its bits");
75 assert( 1 == sizeof( jbyte), "wrong size for basic type");
76 assert( 2 == sizeof( jchar), "wrong size for basic type");
77 assert( 2 == sizeof( jshort), "wrong size for basic type");
78 assert( 4 == sizeof( juint), "wrong size for basic type");
79 assert( 4 == sizeof( jint), "wrong size for basic type");
80 assert( 1 == sizeof( jboolean), "wrong size for basic type");
81 assert( 8 == sizeof( jlong), "wrong size for basic type");
82 assert( 4 == sizeof( jfloat), "wrong size for basic type");
83 assert( 8 == sizeof( jdouble), "wrong size for basic type");
84 assert( 1 == sizeof( u1), "wrong size for basic type");
85 assert( 2 == sizeof( u2), "wrong size for basic type");
86 assert( 4 == sizeof( u4), "wrong size for basic type");
87 assert(wordSize == BytesPerWord, "should be the same since they're used interchangeably");
88 assert(wordSize == HeapWordSize, "should be the same since they're also used interchangeably");
89
90 int num_type_chars = 0;
91 for (int i = 0; i < 99; i++) {
92 if (type2char((BasicType)i) != 0) {
93 assert(char2type(type2char((BasicType)i)) == i, "proper inverses");
94 num_type_chars++;
95 }
96 }
97 assert(num_type_chars == 11, "must have tested the right number of mappings");
98 assert(char2type(0) == T_ILLEGAL, "correct illegality");
99
100 {
101 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
102 BasicType vt = (BasicType)i;
103 BasicType ft = type2field[vt];
104 switch (vt) {
105 // the following types might plausibly show up in memory layouts:
106 case T_BOOLEAN:
107 case T_BYTE:
108 case T_CHAR:
109 case T_SHORT:
110 case T_INT:
111 case T_FLOAT:
112 case T_DOUBLE:
113 case T_LONG:
114 case T_OBJECT:
115 case T_ADDRESS: // random raw pointer
116 case T_METADATA: // metadata pointer
117 case T_NARROWOOP: // compressed pointer
118 case T_NARROWKLASS: // compressed klass pointer
119 case T_CONFLICT: // might as well support a bottom type
120 case T_VOID: // padding or other unaddressed word
121 // layout type must map to itself
122 assert(vt == ft, "");
123 break;
124 default:
125 // non-layout type must map to a (different) layout type
126 assert(vt != ft, "");
127 assert(ft == type2field[ft], "");
128 }
129 // every type must map to same-sized layout type:
130 assert(type2size[vt] == type2size[ft], "");
131 }
132 }
133 // These are assumed, e.g., when filling HeapWords with juints.
134 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
135 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
136 assert((size_t)HeapWordSize >= sizeof(juint),
137 "HeapWord should be at least as large as juint");
138 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
139 #endif
140
141 if( JavaPriority1_To_OSPriority != -1 )
142 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
143 if( JavaPriority2_To_OSPriority != -1 )
144 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
145 if( JavaPriority3_To_OSPriority != -1 )
146 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
147 if( JavaPriority4_To_OSPriority != -1 )
148 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
149 if( JavaPriority5_To_OSPriority != -1 )
150 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
151 if( JavaPriority6_To_OSPriority != -1 )
152 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
153 if( JavaPriority7_To_OSPriority != -1 )
154 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
155 if( JavaPriority8_To_OSPriority != -1 )
156 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
157 if( JavaPriority9_To_OSPriority != -1 )
158 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
159 if(JavaPriority10_To_OSPriority != -1 )
160 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
161
162 // Set the size of basic types here (after argument parsing but before
163 // stub generation).
164 if (UseCompressedOops) {
165 // Size info for oops within java objects is fixed
166 heapOopSize = jintSize;
167 LogBytesPerHeapOop = LogBytesPerInt;
168 LogBitsPerHeapOop = LogBitsPerInt;
169 BytesPerHeapOop = BytesPerInt;
170 BitsPerHeapOop = BitsPerInt;
171 } else {
172 heapOopSize = oopSize;
173 LogBytesPerHeapOop = LogBytesPerWord;
174 LogBitsPerHeapOop = LogBitsPerWord;
175 BytesPerHeapOop = BytesPerWord;
176 BitsPerHeapOop = BitsPerWord;
177 }
178 _type2aelembytes[T_OBJECT] = heapOopSize;
179 _type2aelembytes[T_ARRAY] = heapOopSize;
180 }
181
182
183 // Map BasicType to signature character
184 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};
185
186 // Map BasicType to Java type name
187 const char* type2name_tab[T_CONFLICT+1] = {
188 NULL, NULL, NULL, NULL,
189 "boolean",
190 "char",
191 "float",
192 "double",
193 "byte",
194 "short",
195 "int",
196 "long",
197 "object",
198 "array",
199 "void",
200 "*address*",
201 "*narrowoop*",
202 "*metadata*",
203 "*narrowklass*",
204 "*conflict*"
205 };
206
207
208 BasicType name2type(const char* name) {
209 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
210 BasicType t = (BasicType)i;
211 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))
212 return t;
213 }
214 return T_ILLEGAL;
215 }
216
217 // Map BasicType to size in words
218 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};
219
220 BasicType type2field[T_CONFLICT+1] = {
221 (BasicType)0, // 0,
222 (BasicType)0, // 1,
223 (BasicType)0, // 2,
224 (BasicType)0, // 3,
225 T_BOOLEAN, // T_BOOLEAN = 4,
226 T_CHAR, // T_CHAR = 5,
227 T_FLOAT, // T_FLOAT = 6,
228 T_DOUBLE, // T_DOUBLE = 7,
229 T_BYTE, // T_BYTE = 8,
230 T_SHORT, // T_SHORT = 9,
231 T_INT, // T_INT = 10,
232 T_LONG, // T_LONG = 11,
233 T_OBJECT, // T_OBJECT = 12,
234 T_OBJECT, // T_ARRAY = 13,
235 T_VOID, // T_VOID = 14,
236 T_ADDRESS, // T_ADDRESS = 15,
237 T_NARROWOOP, // T_NARROWOOP= 16,
238 T_METADATA, // T_METADATA = 17,
239 T_NARROWKLASS, // T_NARROWKLASS = 18,
240 T_CONFLICT // T_CONFLICT = 19,
241 };
242
243
244 BasicType type2wfield[T_CONFLICT+1] = {
245 (BasicType)0, // 0,
246 (BasicType)0, // 1,
247 (BasicType)0, // 2,
248 (BasicType)0, // 3,
249 T_INT, // T_BOOLEAN = 4,
250 T_INT, // T_CHAR = 5,
251 T_FLOAT, // T_FLOAT = 6,
252 T_DOUBLE, // T_DOUBLE = 7,
253 T_INT, // T_BYTE = 8,
254 T_INT, // 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 int _type2aelembytes[T_CONFLICT+1] = {
269 0, // 0
270 0, // 1
271 0, // 2
272 0, // 3
273 T_BOOLEAN_aelem_bytes, // T_BOOLEAN = 4,
274 T_CHAR_aelem_bytes, // T_CHAR = 5,
275 T_FLOAT_aelem_bytes, // T_FLOAT = 6,
276 T_DOUBLE_aelem_bytes, // T_DOUBLE = 7,
277 T_BYTE_aelem_bytes, // T_BYTE = 8,
278 T_SHORT_aelem_bytes, // T_SHORT = 9,
279 T_INT_aelem_bytes, // T_INT = 10,
280 T_LONG_aelem_bytes, // T_LONG = 11,
281 T_OBJECT_aelem_bytes, // T_OBJECT = 12,
282 T_ARRAY_aelem_bytes, // T_ARRAY = 13,
283 0, // T_VOID = 14,
284 T_OBJECT_aelem_bytes, // T_ADDRESS = 15,
285 T_NARROWOOP_aelem_bytes, // T_NARROWOOP= 16,
286 T_OBJECT_aelem_bytes, // T_METADATA = 17,
287 T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 18,
288 0 // T_CONFLICT = 19,
289 };
290
291 #ifdef ASSERT
292 int type2aelembytes(BasicType t, bool allow_address) {
293 assert(allow_address || t != T_ADDRESS, " ");
294 return _type2aelembytes[t];
295 }
296 #endif
297
298 // Support for 64-bit integer arithmetic
299
300 // The following code is mostly taken from JVM typedefs_md.h and system_md.c
301
302 static const jlong high_bit = (jlong)1 << (jlong)63;
303 static const jlong other_bits = ~high_bit;
304
305 jlong float2long(jfloat f) {
306 jlong tmp = (jlong) f;
307 if (tmp != high_bit) {
308 return tmp;
309 } else {
310 if (g_isnan((jdouble)f)) {
311 return 0;
312 }
313 if (f < 0) {
314 return high_bit;
315 } else {
316 return other_bits;
317 }
318 }
319 }
320
321
322 jlong double2long(jdouble f) {
323 jlong tmp = (jlong) f;
324 if (tmp != high_bit) {
325 return tmp;
326 } else {
327 if (g_isnan(f)) {
328 return 0;
329 }
330 if (f < 0) {
331 return high_bit;
332 } else {
333 return other_bits;
334 }
335 }
336 }
337
338 // least common multiple
339 size_t lcm(size_t a, size_t b) {
340 size_t cur, div, next;
341
342 cur = MAX2(a, b);
343 div = MIN2(a, b);
344
345 assert(div != 0, "lcm requires positive arguments");
346
347
348 while ((next = cur % div) != 0) {
349 cur = div; div = next;
350 }
351
352
353 julong result = julong(a) * b / div;
354 assert(result <= (size_t)max_uintx, "Integer overflow in lcm");
355
356 return size_t(result);
357 }
358
359
360 // Test that nth_bit macro and friends behave as
361 // expected, even with low-precedence operators.
362
363 STATIC_ASSERT(nth_bit(3) == 0x8);
364 STATIC_ASSERT(nth_bit(1|2) == 0x8);
365
366 STATIC_ASSERT(right_n_bits(3) == 0x7);
367 STATIC_ASSERT(right_n_bits(1|2) == 0x7);
368
369 STATIC_ASSERT(left_n_bits(3) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));
370 STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));