Tue, 29 Jul 2014 13:54:16 +0200
8040121: Load variable through a pointer of an incompatible type in src/hotspot/src/share/vm: opto/output.cpp, runtime/sharedRuntimeTrans.cpp, utilities/globalDefinitions_visCPP.hpp
Summary: Fixed parfait warnings in globalDefinitions files by using a union for casts.
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1998, 2014, 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.
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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
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23 */
25 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_GCC_HPP
26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_GCC_HPP
28 #include "prims/jni.h"
30 // This file holds compiler-dependent includes,
31 // globally used constants & types, class (forward)
32 // declarations and a few frequently used utility functions.
34 #include <ctype.h>
35 #include <string.h>
36 #include <stdarg.h>
37 #include <stddef.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <wchar.h>
42 #ifdef SOLARIS
43 #include <ieeefp.h>
44 #endif // SOLARIS
46 #include <math.h>
47 #ifndef FP_PZERO
48 // Linux doesn't have positive/negative zero
49 #define FP_PZERO FP_ZERO
50 #endif
51 #if (!defined fpclass) && ((!defined SPARC) || (!defined SOLARIS))
52 #define fpclass fpclassify
53 #endif
55 #include <time.h>
56 #include <fcntl.h>
57 #include <dlfcn.h>
58 #include <pthread.h>
60 #ifdef SOLARIS
61 #include <thread.h>
62 #endif // SOLARIS
64 #include <limits.h>
65 #include <errno.h>
67 #ifdef SOLARIS
68 #include <sys/trap.h>
69 #include <sys/regset.h>
70 #include <sys/procset.h>
71 #include <ucontext.h>
72 #include <setjmp.h>
73 #endif // SOLARIS
75 # ifdef SOLARIS_MUTATOR_LIBTHREAD
76 # include <sys/procfs.h>
77 # endif
79 #if defined(LINUX) || defined(_ALLBSD_SOURCE)
80 #ifndef __STDC_LIMIT_MACROS
81 #define __STDC_LIMIT_MACROS
82 #endif // __STDC_LIMIT_MACROS
83 #include <inttypes.h>
84 #include <signal.h>
85 #ifndef __OpenBSD__
86 #include <ucontext.h>
87 #endif
88 #ifdef __APPLE__
89 #include <AvailabilityMacros.h>
90 #include <mach/mach.h>
91 #endif
92 #include <sys/time.h>
93 #endif // LINUX || _ALLBSD_SOURCE
95 // 4810578: varargs unsafe on 32-bit integer/64-bit pointer architectures
96 // When __cplusplus is defined, NULL is defined as 0 (32-bit constant) in
97 // system header files. On 32-bit architectures, there is no problem.
98 // On 64-bit architectures, defining NULL as a 32-bit constant can cause
99 // problems with varargs functions: C++ integral promotion rules say for
100 // varargs, we pass the argument 0 as an int. So, if NULL was passed to a
101 // varargs function it will remain 32-bits. Depending on the calling
102 // convention of the machine, if the argument is passed on the stack then
103 // only 32-bits of the "NULL" pointer may be initialized to zero. The
104 // other 32-bits will be garbage. If the varargs function is expecting a
105 // pointer when it extracts the argument, then we have a problem.
106 //
107 // Solution: For 64-bit architectures, redefine NULL as 64-bit constant 0.
108 //
109 // Note: this fix doesn't work well on Linux because NULL will be overwritten
110 // whenever a system header file is included. Linux handles NULL correctly
111 // through a special type '__null'.
112 #ifdef SOLARIS
113 #ifdef _LP64
114 #undef NULL
115 #define NULL 0L
116 #else
117 #ifndef NULL
118 #define NULL 0
119 #endif
120 #endif
121 #endif
123 // NULL vs NULL_WORD:
124 // On Linux NULL is defined as a special type '__null'. Assigning __null to
125 // integer variable will cause gcc warning. Use NULL_WORD in places where a
126 // pointer is stored as integer value. On some platforms, sizeof(intptr_t) >
127 // sizeof(void*), so here we want something which is integer type, but has the
128 // same size as a pointer.
129 #ifdef __GNUC__
130 #ifdef _LP64
131 #define NULL_WORD 0L
132 #else
133 // Cast 0 to intptr_t rather than int32_t since they are not the same type
134 // on platforms such as Mac OS X.
135 #define NULL_WORD ((intptr_t)0)
136 #endif
137 #else
138 #define NULL_WORD NULL
139 #endif
141 #if !defined(LINUX) && !defined(_ALLBSD_SOURCE)
142 // Compiler-specific primitive types
143 typedef unsigned short uint16_t;
144 #ifndef _UINT32_T
145 #define _UINT32_T
146 typedef unsigned int uint32_t;
147 #endif // _UINT32_T
149 #if !defined(_SYS_INT_TYPES_H)
150 #ifndef _UINT64_T
151 #define _UINT64_T
152 typedef unsigned long long uint64_t;
153 #endif // _UINT64_T
154 // %%%% how to access definition of intptr_t portably in 5.5 onward?
155 typedef int intptr_t;
156 typedef unsigned int uintptr_t;
157 // If this gets an error, figure out a symbol XXX that implies the
158 // prior definition of intptr_t, and add "&& !defined(XXX)" above.
159 #endif // _SYS_INT_TYPES_H
161 #endif // !LINUX && !_ALLBSD_SOURCE
163 // Additional Java basic types
165 typedef uint8_t jubyte;
166 typedef uint16_t jushort;
167 typedef uint32_t juint;
168 typedef uint64_t julong;
171 //----------------------------------------------------------------------------------------------------
172 // Constant for jlong (specifying an long long canstant is C++ compiler specific)
174 // Build a 64bit integer constant
175 #define CONST64(x) (x ## LL)
176 #define UCONST64(x) (x ## ULL)
178 const jlong min_jlong = CONST64(0x8000000000000000);
179 const jlong max_jlong = CONST64(0x7fffffffffffffff);
182 #ifdef SOLARIS
183 //----------------------------------------------------------------------------------------------------
184 // ANSI C++ fixes
185 // NOTE:In the ANSI committee's continuing attempt to make each version
186 // of C++ incompatible with the previous version, you can no longer cast
187 // pointers to functions without specifying linkage unless you want to get
188 // warnings.
189 //
190 // This also means that pointers to functions can no longer be "hidden"
191 // in opaque types like void * because at the invokation point warnings
192 // will be generated. While this makes perfect sense from a type safety
193 // point of view it causes a lot of warnings on old code using C header
194 // files. Here are some typedefs to make the job of silencing warnings
195 // a bit easier.
196 //
197 // The final kick in the teeth is that you can only have extern "C" linkage
198 // specified at file scope. So these typedefs are here rather than in the
199 // .hpp for the class (os:Solaris usually) that needs them.
201 extern "C" {
202 typedef int (*int_fnP_thread_t_iP_uP_stack_tP_gregset_t)(thread_t, int*, unsigned *, stack_t*, gregset_t);
203 typedef int (*int_fnP_thread_t_i_gregset_t)(thread_t, int, gregset_t);
204 typedef int (*int_fnP_thread_t_i)(thread_t, int);
205 typedef int (*int_fnP_thread_t)(thread_t);
207 typedef int (*int_fnP_cond_tP_mutex_tP_timestruc_tP)(cond_t *cv, mutex_t *mx, timestruc_t *abst);
208 typedef int (*int_fnP_cond_tP_mutex_tP)(cond_t *cv, mutex_t *mx);
210 // typedef for missing API in libc
211 typedef int (*int_fnP_mutex_tP_i_vP)(mutex_t *, int, void *);
212 typedef int (*int_fnP_mutex_tP)(mutex_t *);
213 typedef int (*int_fnP_cond_tP_i_vP)(cond_t *cv, int scope, void *arg);
214 typedef int (*int_fnP_cond_tP)(cond_t *cv);
215 };
216 #endif // SOLARIS
218 //----------------------------------------------------------------------------------------------------
219 // Debugging
221 #define DEBUG_EXCEPTION ::abort();
223 #ifdef ARM
224 #ifdef SOLARIS
225 #define BREAKPOINT __asm__ volatile (".long 0xe1200070")
226 #else
227 #define BREAKPOINT __asm__ volatile (".long 0xe7f001f0")
228 #endif
229 #else
230 extern "C" void breakpoint();
231 #define BREAKPOINT ::breakpoint()
232 #endif
234 // checking for nanness
235 #ifdef SOLARIS
236 #ifdef SPARC
237 inline int g_isnan(float f) { return isnanf(f); }
238 #else
239 // isnanf() broken on Intel Solaris use isnand()
240 inline int g_isnan(float f) { return isnand(f); }
241 #endif
242 inline int g_isnan(double f) { return isnand(f); }
243 #elif defined(__APPLE__)
244 inline int g_isnan(double f) { return isnan(f); }
245 #elif defined(LINUX) || defined(_ALLBSD_SOURCE)
246 inline int g_isnan(float f) { return isnanf(f); }
247 inline int g_isnan(double f) { return isnan(f); }
248 #else
249 #error "missing platform-specific definition here"
250 #endif
252 // GCC 4.3 does not allow 0.0/0.0 to produce a NAN value
253 #if (__GNUC__ == 4) && (__GNUC_MINOR__ > 2)
254 #define CAN_USE_NAN_DEFINE 1
255 #endif
258 // Checking for finiteness
260 inline int g_isfinite(jfloat f) { return finite(f); }
261 inline int g_isfinite(jdouble f) { return finite(f); }
264 // Wide characters
266 inline int wcslen(const jchar* x) { return wcslen((const wchar_t*)x); }
269 // Portability macros
270 #define PRAGMA_INTERFACE #pragma interface
271 #define PRAGMA_IMPLEMENTATION #pragma implementation
272 #define VALUE_OBJ_CLASS_SPEC
274 #ifndef ATTRIBUTE_PRINTF
275 // Diagnostic pragmas like the ones defined below in PRAGMA_FORMAT_NONLITERAL_IGNORED
276 // were only introduced in GCC 4.2. Because we have no other possibility to ignore
277 // these warnings for older versions of GCC, we simply don't decorate our printf-style
278 // functions with __attribute__(format) in that case.
279 #if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2)) || (__GNUC__ > 4)
280 #define ATTRIBUTE_PRINTF(fmt,vargs) __attribute__((format(printf, fmt, vargs)))
281 #else
282 #define ATTRIBUTE_PRINTF(fmt,vargs)
283 #endif
284 #endif
286 #define PRAGMA_FORMAT_NONLITERAL_IGNORED _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"") \
287 _Pragma("GCC diagnostic ignored \"-Wformat-security\"")
288 #define PRAGMA_FORMAT_IGNORED _Pragma("GCC diagnostic ignored \"-Wformat\"")
290 #if defined(__clang_major__) && \
291 (__clang_major__ >= 4 || \
292 (__clang_major__ >= 3 && __clang_minor__ >= 1)) || \
293 ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4)
294 // Tested to work with clang version 3.1 and better.
295 #define PRAGMA_DIAG_PUSH _Pragma("GCC diagnostic push")
296 #define PRAGMA_DIAG_POP _Pragma("GCC diagnostic pop")
297 #define PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL
298 #define PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL PRAGMA_FORMAT_NONLITERAL_IGNORED
300 // Hack to deal with gcc yammering about non-security format stuff
301 #else
302 // Old versions of gcc don't do push/pop, also do not cope with this pragma within a function
303 // One method does so much varied printing that it is decorated with both internal and external
304 // versions of the macro-pragma to obtain better checking with newer compilers.
305 #define PRAGMA_DIAG_PUSH
306 #define PRAGMA_DIAG_POP
307 #define PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL PRAGMA_FORMAT_NONLITERAL_IGNORED
308 #define PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL
309 #endif
311 #ifndef __clang_major__
312 #define PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC _Pragma("GCC diagnostic ignored \"-Wformat\"") _Pragma("GCC diagnostic error \"-Wformat-nonliteral\"") _Pragma("GCC diagnostic error \"-Wformat-security\"")
313 #endif
315 #if (__GNUC__ == 2) && (__GNUC_MINOR__ < 95)
316 #define TEMPLATE_TABLE_BUG
317 #endif
318 #if (__GNUC__ == 2) && (__GNUC_MINOR__ >= 96)
319 #define CONST_SDM_BUG
320 #endif
322 // Formatting.
323 #ifdef _LP64
324 #define FORMAT64_MODIFIER "l"
325 #else // !_LP64
326 #define FORMAT64_MODIFIER "ll"
327 #endif // _LP64
329 // HACK: gcc warns about applying offsetof() to non-POD object or calculating
330 // offset directly when base address is NULL. Use 16 to get around the
331 // warning. gcc-3.4 has an option -Wno-invalid-offsetof to suppress
332 // this warning.
333 #define offset_of(klass,field) (size_t)((intx)&(((klass*)16)->field) - 16)
335 #ifdef offsetof
336 # undef offsetof
337 #endif
338 #define offsetof(klass,field) offset_of(klass,field)
340 #if defined(_LP64) && defined(__APPLE__)
341 #define JLONG_FORMAT "%ld"
342 #endif // _LP64 && __APPLE__
344 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_GCC_HPP