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--- old/src/share/vm/utilities/exceptions.hpp
+++ new/src/share/vm/utilities/exceptions.hpp
1 1 /*
2 2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_UTILITIES_EXCEPTIONS_HPP
26 26 #define SHARE_VM_UTILITIES_EXCEPTIONS_HPP
27 27
28 28 #include "memory/allocation.hpp"
29 29 #include "oops/oopsHierarchy.hpp"
30 30 #include "utilities/sizes.hpp"
31 31
32 32 // This file provides the basic support for exception handling in the VM.
33 33 // Note: We do not use C++ exceptions to avoid compiler dependencies and
34 34 // unpredictable performance.
35 35 //
36 36 // Scheme: Exceptions are stored with the thread. There is never more
37 37 // than one pending exception per thread. All functions that can throw
38 38 // an exception carry a THREAD argument (usually the last argument and
39 39 // declared with the TRAPS macro). Throwing an exception means setting
40 40 // a pending exception in the thread. Upon return from a function that
41 41 // can throw an exception, we must check if an exception is pending.
42 42 // The CHECK macros do this in a convenient way. Carrying around the
43 43 // thread provides also convenient access to it (e.g. for Handle
44 44 // creation, w/o the need for recomputation).
45 45
46 46
47 47
48 48 // Forward declarations to be independent of the include structure.
49 49 // This allows us to have exceptions.hpp included in top.hpp.
50 50
51 51 class Thread;
52 52 class Handle;
53 53 class Symbol;
54 54 class JavaCallArguments;
55 55
56 56 // The ThreadShadow class is a helper class to access the _pending_exception
57 57 // field of the Thread class w/o having access to the Thread's interface (for
58 58 // include hierachy reasons).
59 59
60 60 class ThreadShadow: public CHeapObj<mtThread> {
61 61 friend class VMStructs;
62 62
63 63 protected:
64 64 oop _pending_exception; // Thread has gc actions.
65 65 const char* _exception_file; // file information for exception (debugging only)
66 66 int _exception_line; // line information for exception (debugging only)
67 67 friend void check_ThreadShadow(); // checks _pending_exception offset
68 68
69 69 // The following virtual exists only to force creation of a vtable.
70 70 // We need ThreadShadow to have a vtable, even in product builds,
71 71 // so that its layout will start at an offset of zero relative to Thread.
72 72 // Some C++ compilers are so "clever" that they put the ThreadShadow
73 73 // base class at offset 4 in Thread (after Thread's vtable), if they
74 74 // notice that Thread has a vtable but ThreadShadow does not.
75 75 virtual void unused_initial_virtual() { }
76 76
77 77 public:
78 78 oop pending_exception() const { return _pending_exception; }
79 79 bool has_pending_exception() const { return _pending_exception != NULL; }
80 80 const char* exception_file() const { return _exception_file; }
81 81 int exception_line() const { return _exception_line; }
82 82
83 83 // Code generation support
84 84 static ByteSize pending_exception_offset() { return byte_offset_of(ThreadShadow, _pending_exception); }
85 85
86 86 // use THROW whenever possible!
87 87 void set_pending_exception(oop exception, const char* file, int line);
88 88
89 89 // use CLEAR_PENDING_EXCEPTION whenever possible!
90 90 void clear_pending_exception();
91 91
92 92 ThreadShadow() : _pending_exception(NULL),
93 93 _exception_file(NULL), _exception_line(0) {}
94 94 };
95 95
96 96
97 97 // Exceptions is a helper class that encapsulates all operations
98 98 // that require access to the thread interface and which are
99 99 // relatively rare. The Exceptions operations should only be
100 100 // used directly if the macros below are insufficient.
101 101
102 102 class Exceptions {
103 103 static bool special_exception(Thread *thread, const char* file, int line, Handle exception);
104 104 static bool special_exception(Thread* thread, const char* file, int line, Symbol* name, const char* message);
105 105 public:
106 106 // this enum is defined to indicate whether it is safe to
107 107 // ignore the encoding scheme of the original message string.
108 108 typedef enum {
109 109 safe_to_utf8 = 0,
110 110 unsafe_to_utf8 = 1
111 111 } ExceptionMsgToUtf8Mode;
112 112 // Throw exceptions: w/o message, w/ message & with formatted message.
113 113 static void _throw_oop(Thread* thread, const char* file, int line, oop exception);
114 114 static void _throw(Thread* thread, const char* file, int line, Handle exception, const char* msg = NULL);
115 115
116 116 static void _throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message);
117 117 static void _throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message,
118 118 Handle loader, Handle protection_domain);
119 119
120 120 static void _throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause);
121 121 static void _throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause,
122 122 Handle h_loader, Handle h_protection_domain);
123 123
124 124 static void _throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause);
125 125 static void _throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause,
126 126 Handle h_loader, Handle h_protection_domain);
127 127
128 128 static void _throw_args(Thread* thread, const char* file, int line,
129 129 Symbol* name, Symbol* signature,
130 130 JavaCallArguments* args);
131 131
132 132 // There is no THROW... macro for this method. Caller should remember
133 133 // to do a return after calling it.
134 134 static void fthrow(Thread* thread, const char* file, int line, Symbol* name,
135 135 const char* format, ...);
136 136
137 137 // Create and initialize a new exception
138 138 static Handle new_exception(Thread* thread, Symbol* name,
139 139 Symbol* signature, JavaCallArguments* args,
140 140 Handle loader, Handle protection_domain);
141 141
142 142 static Handle new_exception(Thread* thread, Symbol* name,
143 143 Symbol* signature, JavaCallArguments* args,
144 144 Handle cause,
145 145 Handle loader, Handle protection_domain);
146 146
147 147 static Handle new_exception(Thread* thread, Symbol* name,
148 148 Handle cause,
149 149 Handle loader, Handle protection_domain,
150 150 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8);
151 151
152 152 static Handle new_exception(Thread* thread, Symbol* name,
153 153 const char* message, Handle cause,
154 154 Handle loader, Handle protection_domain,
155 155 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8);
156 156
157 157 static Handle new_exception(Thread* thread, Symbol* name,
158 158 const char* message,
159 159 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8);
160 160
161 161 static void throw_stack_overflow_exception(Thread* thread, const char* file, int line, methodHandle method);
162 162
163 163 // for AbortVMOnException flag
164 164 NOT_PRODUCT(static void debug_check_abort(Handle exception, const char* message = NULL);)
165 165 NOT_PRODUCT(static void debug_check_abort(const char *value_string, const char* message = NULL);)
166 166 };
167 167
168 168
169 169 // The THREAD & TRAPS macros facilitate the declaration of functions that throw exceptions.
170 170 // Convention: Use the TRAPS macro as the last argument of such a function; e.g.:
171 171 //
172 172 // int this_function_may_trap(int x, float y, TRAPS)
173 173
174 174 #define THREAD __the_thread__
175 175 #define TRAPS Thread* THREAD
176 176
177 177
178 178 // The CHECK... macros should be used to pass along a THREAD reference and to check for pending
179 179 // exceptions. In special situations it is necessary to handle pending exceptions explicitly,
180 180 // in these cases the PENDING_EXCEPTION helper macros should be used.
181 181 //
182 182 // Macro naming conventions: Macros that end with _ require a result value to be returned. They
183 183 // are for functions with non-void result type. The result value is usually ignored because of
184 184 // the exception and is only needed for syntactic correctness. The _0 ending is a shortcut for
185 185 // _(0) since this is a frequent case. Example:
186 186 //
187 187 // int result = this_function_may_trap(x_arg, y_arg, CHECK_0);
188 188 //
189 189 // CAUTION: make sure that the function call using a CHECK macro is not the only statement of a
190 190 // conditional branch w/o enclosing {} braces, since the CHECK macros expand into several state-
191 191 // ments!
192 192
193 193 #define PENDING_EXCEPTION (((ThreadShadow*)THREAD)->pending_exception())
194 194 #define HAS_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->has_pending_exception())
195 195 #define CLEAR_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->clear_pending_exception())
196 196
197 197 #define CHECK THREAD); if (HAS_PENDING_EXCEPTION) return ; (0
198 198 #define CHECK_(result) THREAD); if (HAS_PENDING_EXCEPTION) return result; (0
199 199 #define CHECK_0 CHECK_(0)
200 200 #define CHECK_NH CHECK_(Handle())
201 201 #define CHECK_NULL CHECK_(NULL)
202 202 #define CHECK_false CHECK_(false)
203 203
204 204 #define CHECK_AND_CLEAR THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return; } (0
205 205 #define CHECK_AND_CLEAR_(result) THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return result; } (0
206 206 #define CHECK_AND_CLEAR_0 CHECK_AND_CLEAR_(0)
207 207 #define CHECK_AND_CLEAR_NH CHECK_AND_CLEAR_(Handle())
208 208 #define CHECK_AND_CLEAR_NULL CHECK_AND_CLEAR_(NULL)
209 209 #define CHECK_AND_CLEAR_false CHECK_AND_CLEAR_(false)
210 210
211 211 // The THROW... macros should be used to throw an exception. They require a THREAD variable to be
212 212 // visible within the scope containing the THROW. Usually this is achieved by declaring the function
213 213 // with a TRAPS argument.
214 214
215 215 #define THREAD_AND_LOCATION THREAD, __FILE__, __LINE__
216 216
217 217 #define THROW_OOP(e) \
218 218 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return; }
219 219
220 220 #define THROW_HANDLE(e) \
221 221 { Exceptions::_throw(THREAD_AND_LOCATION, e); return; }
222 222
223 223 #define THROW(name) \
224 224 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return; }
225 225
226 226 #define THROW_MSG(name, message) \
227 227 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return; }
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228 228
229 229 #define THROW_CAUSE(name, cause) \
230 230 { Exceptions::_throw_cause(THREAD_AND_LOCATION, name, cause); return; }
231 231
232 232 #define THROW_MSG_LOADER(name, message, loader, protection_domain) \
233 233 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return; }
234 234
235 235 #define THROW_ARG(name, signature, args) \
236 236 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return; }
237 237
238 -#define THROW_MSG_CAUSE(name, message, cause) \
239 - { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return; }
240 -
241 238 #define THROW_OOP_(e, result) \
242 239 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return result; }
243 240
244 241 #define THROW_HANDLE_(e, result) \
245 242 { Exceptions::_throw(THREAD_AND_LOCATION, e); return result; }
246 243
247 244 #define THROW_(name, result) \
248 245 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return result; }
249 246
250 247 #define THROW_MSG_(name, message, result) \
251 248 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return result; }
252 249
253 250 #define THROW_MSG_LOADER_(name, message, loader, protection_domain, result) \
254 251 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return result; }
255 252
256 253 #define THROW_ARG_(name, signature, args, result) \
257 254 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return result; }
258 255
259 256 #define THROW_MSG_CAUSE(name, message, cause) \
260 257 { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return; }
261 258
262 259 #define THROW_MSG_CAUSE_(name, message, cause, result) \
263 260 { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return result; }
264 261
265 262
266 263 #define THROW_OOP_0(e) THROW_OOP_(e, 0)
267 264 #define THROW_HANDLE_0(e) THROW_HANDLE_(e, 0)
268 265 #define THROW_0(name) THROW_(name, 0)
269 266 #define THROW_MSG_0(name, message) THROW_MSG_(name, message, 0)
270 267 #define THROW_WRAPPED_0(name, oop_to_wrap) THROW_WRAPPED_(name, oop_to_wrap, 0)
271 268 #define THROW_ARG_0(name, signature, arg) THROW_ARG_(name, signature, arg, 0)
272 269 #define THROW_MSG_CAUSE_0(name, message, cause) THROW_MSG_CAUSE_(name, message, cause, 0)
273 270
274 271 #define THROW_NULL(name) THROW_(name, NULL)
275 272 #define THROW_MSG_NULL(name, message) THROW_MSG_(name, message, NULL)
276 273
277 274 // The CATCH macro checks that no exception has been thrown by a function; it is used at
278 275 // call sites about which is statically known that the callee cannot throw an exception
279 276 // even though it is declared with TRAPS.
280 277
281 278 #define CATCH \
282 279 THREAD); if (HAS_PENDING_EXCEPTION) { \
283 280 oop ex = PENDING_EXCEPTION; \
284 281 CLEAR_PENDING_EXCEPTION; \
285 282 ex->print(); \
286 283 ShouldNotReachHere(); \
287 284 } (0
288 285
289 286 // ExceptionMark is a stack-allocated helper class for local exception handling.
290 287 // It is used with the EXCEPTION_MARK macro.
291 288
292 289 class ExceptionMark {
293 290 private:
294 291 Thread* _thread;
295 292
296 293 public:
297 294 ExceptionMark(Thread*& thread);
298 295 ~ExceptionMark();
299 296 };
300 297
301 298
302 299
303 300 // Use an EXCEPTION_MARK for 'local' exceptions. EXCEPTION_MARK makes sure that no
304 301 // pending exception exists upon entering its scope and tests that no pending exception
305 302 // exists when leaving the scope.
306 303
307 304 // See also preserveException.hpp for PRESERVE_EXCEPTION_MARK macro,
308 305 // which preserves pre-existing exceptions and does not allow new
309 306 // exceptions.
310 307
311 308 #define EXCEPTION_MARK Thread* THREAD; ExceptionMark __em(THREAD);
312 309
313 310 #endif // SHARE_VM_UTILITIES_EXCEPTIONS_HPP
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