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comparison: src/share/vm/utilities/globalDefinitions.cpp

src/share/vm/utilities/globalDefinitions.cpp

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1 /*
2 * Copyright (c) 1997, 2013, 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 #include "utilities/top.hpp"
29
30 // Basic error support
31
32 // Info for oops within a java object. Defaults are zero so
33 // things will break badly if incorrectly initialized.
34 int heapOopSize = 0;
35 int LogBytesPerHeapOop = 0;
36 int LogBitsPerHeapOop = 0;
37 int BytesPerHeapOop = 0;
38 int BitsPerHeapOop = 0;
39
40 // Object alignment, in units of HeapWords.
41 // Defaults are -1 so things will break badly if incorrectly initialized.
42 int MinObjAlignment = -1;
43 int MinObjAlignmentInBytes = -1;
44 int MinObjAlignmentInBytesMask = 0;
45
46 int LogMinObjAlignment = -1;
47 int LogMinObjAlignmentInBytes = -1;
48
49 // Oop encoding heap max
50 uint64_t OopEncodingHeapMax = 0;
51
52 void basic_fatal(const char* msg) {
53 fatal(msg);
54 }
55
56 // Something to help porters sleep at night
57
58 void basic_types_init() {
59 #ifdef ASSERT
60 #ifdef _LP64
61 assert(min_intx == (intx)CONST64(0x8000000000000000), "correct constant");
62 assert(max_intx == CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");
63 assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");
64 assert( 8 == sizeof( intx), "wrong size for basic type");
65 assert( 8 == sizeof( jobject), "wrong size for basic type");
66 #else
67 assert(min_intx == (intx)0x80000000, "correct constant");
68 assert(max_intx == 0x7FFFFFFF, "correct constant");
69 assert(max_uintx == 0xFFFFFFFF, "correct constant");
70 assert( 4 == sizeof( intx), "wrong size for basic type");
71 assert( 4 == sizeof( jobject), "wrong size for basic type");
72 #endif
73 assert( (~max_juint) == 0, "max_juint has all its bits");
74 assert( (~max_uintx) == 0, "max_uintx has all its bits");
75 assert( (~max_julong) == 0, "max_julong has all its bits");
76 assert( 1 == sizeof( jbyte), "wrong size for basic type");
77 assert( 2 == sizeof( jchar), "wrong size for basic type");
78 assert( 2 == sizeof( jshort), "wrong size for basic type");
79 assert( 4 == sizeof( juint), "wrong size for basic type");
80 assert( 4 == sizeof( jint), "wrong size for basic type");
81 assert( 1 == sizeof( jboolean), "wrong size for basic type");
82 assert( 8 == sizeof( jlong), "wrong size for basic type");
83 assert( 4 == sizeof( jfloat), "wrong size for basic type");
84 assert( 8 == sizeof( jdouble), "wrong size for basic type");
85 assert( 1 == sizeof( u1), "wrong size for basic type");
86 assert( 2 == sizeof( u2), "wrong size for basic type");
87 assert( 4 == sizeof( u4), "wrong size for basic type");
88
89 int num_type_chars = 0;
90 for (int i = 0; i < 99; i++) {
91 if (type2char((BasicType)i) != 0) {
92 assert(char2type(type2char((BasicType)i)) == i, "proper inverses");
93 num_type_chars++;
94 }
95 }
96 assert(num_type_chars == 11, "must have tested the right number of mappings");
97 assert(char2type(0) == T_ILLEGAL, "correct illegality");
98
99 {
100 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
101 BasicType vt = (BasicType)i;
102 BasicType ft = type2field[vt];
103 switch (vt) {
104 // the following types might plausibly show up in memory layouts:
105 case T_BOOLEAN:
106 case T_BYTE:
107 case T_CHAR:
108 case T_SHORT:
109 case T_INT:
110 case T_FLOAT:
111 case T_DOUBLE:
112 case T_LONG:
113 case T_OBJECT:
114 case T_ADDRESS: // random raw pointer
115 case T_METADATA: // metadata pointer
116 case T_NARROWOOP: // compressed pointer
117 case T_NARROWKLASS: // compressed klass pointer
118 case T_CONFLICT: // might as well support a bottom type
119 case T_VOID: // padding or other unaddressed word
120 // layout type must map to itself
121 assert(vt == ft, "");
122 break;
123 default:
124 // non-layout type must map to a (different) layout type
125 assert(vt != ft, "");
126 assert(ft == type2field[ft], "");
127 }
128 // every type must map to same-sized layout type:
129 assert(type2size[vt] == type2size[ft], "");
130 }
131 }
132 // These are assumed, e.g., when filling HeapWords with juints.
133 assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");
134 assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");
135 assert((size_t)HeapWordSize >= sizeof(juint),
136 "HeapWord should be at least as large as juint");
137 assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");
138 #endif
139
140 if( JavaPriority1_To_OSPriority != -1 )
141 os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;
142 if( JavaPriority2_To_OSPriority != -1 )
143 os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;
144 if( JavaPriority3_To_OSPriority != -1 )
145 os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;
146 if( JavaPriority4_To_OSPriority != -1 )
147 os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;
148 if( JavaPriority5_To_OSPriority != -1 )
149 os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;
150 if( JavaPriority6_To_OSPriority != -1 )
151 os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;
152 if( JavaPriority7_To_OSPriority != -1 )
153 os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;
154 if( JavaPriority8_To_OSPriority != -1 )
155 os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;
156 if( JavaPriority9_To_OSPriority != -1 )
157 os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;
158 if(JavaPriority10_To_OSPriority != -1 )
159 os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;
160
161 // Set the size of basic types here (after argument parsing but before
162 // stub generation).
163 if (UseCompressedOops) {
164 // Size info for oops within java objects is fixed
165 heapOopSize = jintSize;
166 LogBytesPerHeapOop = LogBytesPerInt;
167 LogBitsPerHeapOop = LogBitsPerInt;
168 BytesPerHeapOop = BytesPerInt;
169 BitsPerHeapOop = BitsPerInt;
170 } else {
171 heapOopSize = oopSize;
172 LogBytesPerHeapOop = LogBytesPerWord;
173 LogBitsPerHeapOop = LogBitsPerWord;
174 BytesPerHeapOop = BytesPerWord;
175 BitsPerHeapOop = BitsPerWord;
176 }
177 _type2aelembytes[T_OBJECT] = heapOopSize;
178 _type2aelembytes[T_ARRAY] = 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', '[', 'V', 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 "void",
199 "*address*",
200 "*narrowoop*",
201 "*metadata*",
202 "*narrowklass*",
203 "*conflict*"
204 };
205
206
207 BasicType name2type(const char* name) {
208 for (int i = T_BOOLEAN; i <= T_VOID; i++) {
209 BasicType t = (BasicType)i;
210 if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))
211 return t;
212 }
213 return T_ILLEGAL;
214 }
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 #ifndef PRODUCT
360
361 void GlobalDefinitions::test_globals() {
362 intptr_t page_sizes[] = { os::vm_page_size(), 4096, 8192, 65536, 2*1024*1024 };
363 const int num_page_sizes = sizeof(page_sizes) / sizeof(page_sizes[0]);
364
365 for (int i = 0; i < num_page_sizes; i++) {
366 intptr_t page_size = page_sizes[i];
367
368 address a_page = (address)(10*page_size);
369
370 // Check that address within page is returned as is
371 assert(clamp_address_in_page(a_page, a_page, page_size) == a_page, "incorrect");
372 assert(clamp_address_in_page(a_page + 128, a_page, page_size) == a_page + 128, "incorrect");
373 assert(clamp_address_in_page(a_page + page_size - 1, a_page, page_size) == a_page + page_size - 1, "incorrect");
374
375 // Check that address above page returns start of next page
376 assert(clamp_address_in_page(a_page + page_size, a_page, page_size) == a_page + page_size, "incorrect");
377 assert(clamp_address_in_page(a_page + page_size + 1, a_page, page_size) == a_page + page_size, "incorrect");
378 assert(clamp_address_in_page(a_page + page_size*5 + 1, a_page, page_size) == a_page + page_size, "incorrect");
379
380 // Check that address below page returns start of page
381 assert(clamp_address_in_page(a_page - 1, a_page, page_size) == a_page, "incorrect");
382 assert(clamp_address_in_page(a_page - 2*page_size - 1, a_page, page_size) == a_page, "incorrect");
383 assert(clamp_address_in_page(a_page - 5*page_size - 1, a_page, page_size) == a_page, "incorrect");
384 }
385 }
386
387 #endif // PRODUCT

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