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annotate src/share/vm/utilities/exceptions.hpp @ 2004:4da76e32c0be
7002666: eclipse CDT projects crash with compressed oops
Reviewed-by: kvn, twisti
author | never |
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date | Wed, 01 Dec 2010 10:16:31 -0800 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_EXCEPTIONS_HPP |
26 #define SHARE_VM_UTILITIES_EXCEPTIONS_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "oops/oopsHierarchy.hpp" | |
30 #include "utilities/sizes.hpp" | |
31 | |
0 | 32 // This file provides the basic support for exception handling in the VM. |
33 // Note: We do not use C++ exceptions to avoid compiler dependencies and | |
34 // unpredictable performance. | |
35 // | |
36 // Scheme: Exceptions are stored with the thread. There is never more | |
37 // than one pending exception per thread. All functions that can throw | |
38 // an exception carry a THREAD argument (usually the last argument and | |
39 // declared with the TRAPS macro). Throwing an exception means setting | |
40 // a pending exception in the thread. Upon return from a function that | |
41 // can throw an exception, we must check if an exception is pending. | |
42 // The CHECK macros do this in a convenient way. Carrying around the | |
43 // thread provides also convenient access to it (e.g. for Handle | |
44 // creation, w/o the need for recomputation). | |
45 | |
46 | |
47 | |
48 // Forward declarations to be independent of the include structure. | |
49 // This allows us to have exceptions.hpp included in top.hpp. | |
50 | |
51 class Thread; | |
52 class Handle; | |
53 class symbolHandle; | |
54 class symbolOopDesc; | |
55 class JavaCallArguments; | |
56 | |
57 // The ThreadShadow class is a helper class to access the _pending_exception | |
58 // field of the Thread class w/o having access to the Thread's interface (for | |
59 // include hierachy reasons). | |
60 | |
61 class ThreadShadow: public CHeapObj { | |
62 protected: | |
63 oop _pending_exception; // Thread has gc actions. | |
64 const char* _exception_file; // file information for exception (debugging only) | |
65 int _exception_line; // line information for exception (debugging only) | |
66 friend void check_ThreadShadow(); // checks _pending_exception offset | |
67 | |
68 // The following virtual exists only to force creation of a vtable. | |
69 // We need ThreadShadow to have a vtable, even in product builds, | |
70 // so that its layout will start at an offset of zero relative to Thread. | |
71 // Some C++ compilers are so "clever" that they put the ThreadShadow | |
72 // base class at offset 4 in Thread (after Thread's vtable), if they | |
73 // notice that Thread has a vtable but ThreadShadow does not. | |
74 virtual void unused_initial_virtual() { } | |
75 | |
76 public: | |
77 oop pending_exception() const { return _pending_exception; } | |
78 bool has_pending_exception() const { return _pending_exception != NULL; } | |
79 const char* exception_file() const { return _exception_file; } | |
80 int exception_line() const { return _exception_line; } | |
81 | |
82 // Code generation support | |
83 static ByteSize pending_exception_offset() { return byte_offset_of(ThreadShadow, _pending_exception); } | |
84 | |
85 // use THROW whenever possible! | |
86 void set_pending_exception(oop exception, const char* file, int line); | |
87 | |
88 // use CLEAR_PENDING_EXCEPTION whenever possible! | |
89 void clear_pending_exception(); | |
90 | |
91 ThreadShadow() : _pending_exception(NULL), | |
92 _exception_file(NULL), _exception_line(0) {} | |
93 }; | |
94 | |
95 | |
96 // Exceptions is a helper class that encapsulates all operations | |
97 // that require access to the thread interface and which are | |
98 // relatively rare. The Exceptions operations should only be | |
99 // used directly if the macros below are insufficient. | |
100 | |
101 class Exceptions { | |
102 static bool special_exception(Thread *thread, const char* file, int line, Handle exception); | |
103 static bool special_exception(Thread* thread, const char* file, int line, symbolHandle name, const char* message); | |
104 public: | |
105 // this enum is defined to indicate whether it is safe to | |
106 // ignore the encoding scheme of the original message string. | |
107 typedef enum { | |
108 safe_to_utf8 = 0, | |
109 unsafe_to_utf8 = 1 | |
110 } ExceptionMsgToUtf8Mode; | |
111 // Throw exceptions: w/o message, w/ message & with formatted message. | |
112 static void _throw_oop(Thread* thread, const char* file, int line, oop exception); | |
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113 static void _throw(Thread* thread, const char* file, int line, Handle exception, const char* msg = NULL); |
0 | 114 static void _throw_msg(Thread* thread, const char* file, int line, |
115 symbolHandle name, const char* message, Handle loader, | |
116 Handle protection_domain); | |
117 static void _throw_msg(Thread* thread, const char* file, int line, | |
118 symbolOop name, const char* message); | |
119 static void _throw_msg(Thread* thread, const char* file, int line, | |
120 symbolHandle name, const char* message); | |
121 static void _throw_args(Thread* thread, const char* file, int line, | |
122 symbolHandle name, symbolHandle signature, | |
123 JavaCallArguments* args); | |
124 static void _throw_msg_cause(Thread* thread, const char* file, | |
125 int line, symbolHandle h_name, const char* message, | |
126 Handle h_cause, Handle h_loader, Handle h_protection_domain); | |
127 static void _throw_msg_cause(Thread* thread, const char* file, int line, | |
128 symbolHandle name, const char* message, Handle cause); | |
129 | |
130 // There is no THROW... macro for this method. Caller should remember | |
131 // to do a return after calling it. | |
132 static void fthrow(Thread* thread, const char* file, int line, symbolHandle name, | |
133 const char* format, ...); | |
134 | |
135 // Create and initialize a new exception | |
136 static Handle new_exception(Thread* thread, symbolHandle name, | |
137 symbolHandle signature, JavaCallArguments* args, | |
138 Handle cause, Handle loader, | |
139 Handle protection_domain); | |
140 | |
141 static Handle new_exception(Thread* thread, symbolHandle name, | |
142 const char* message, Handle cause, Handle loader, | |
143 Handle protection_domain, | |
144 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8); | |
145 | |
146 static Handle new_exception(Thread* thread, symbolOop name, | |
147 const char* message, | |
148 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8); | |
149 | |
150 static void throw_stack_overflow_exception(Thread* thread, const char* file, int line); | |
151 | |
152 // for AbortVMOnException flag | |
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153 NOT_PRODUCT(static void debug_check_abort(Handle exception, const char* message = NULL);) |
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154 NOT_PRODUCT(static void debug_check_abort(const char *value_string, const char* message = NULL);) |
0 | 155 }; |
156 | |
157 | |
158 // The THREAD & TRAPS macros facilitate the declaration of functions that throw exceptions. | |
159 // Convention: Use the TRAPS macro as the last argument of such a function; e.g.: | |
160 // | |
161 // int this_function_may_trap(int x, float y, TRAPS) | |
162 | |
163 #define THREAD __the_thread__ | |
164 #define TRAPS Thread* THREAD | |
165 | |
166 | |
167 // The CHECK... macros should be used to pass along a THREAD reference and to check for pending | |
168 // exceptions. In special situations it is necessary to handle pending exceptions explicitly, | |
169 // in these cases the PENDING_EXCEPTION helper macros should be used. | |
170 // | |
171 // Macro naming conventions: Macros that end with _ require a result value to be returned. They | |
172 // are for functions with non-void result type. The result value is usually ignored because of | |
173 // the exception and is only needed for syntactic correctness. The _0 ending is a shortcut for | |
174 // _(0) since this is a frequent case. Example: | |
175 // | |
176 // int result = this_function_may_trap(x_arg, y_arg, CHECK_0); | |
177 // | |
178 // CAUTION: make sure that the function call using a CHECK macro is not the only statement of a | |
179 // conditional branch w/o enclosing {} braces, since the CHECK macros expand into several state- | |
180 // ments! | |
181 | |
182 #define PENDING_EXCEPTION (((ThreadShadow*)THREAD)->pending_exception()) | |
183 #define HAS_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->has_pending_exception()) | |
184 #define CLEAR_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->clear_pending_exception()) | |
185 | |
186 #define CHECK THREAD); if (HAS_PENDING_EXCEPTION) return ; (0 | |
187 #define CHECK_(result) THREAD); if (HAS_PENDING_EXCEPTION) return result; (0 | |
188 #define CHECK_0 CHECK_(0) | |
189 #define CHECK_NH CHECK_(Handle()) | |
190 #define CHECK_NULL CHECK_(NULL) | |
191 #define CHECK_false CHECK_(false) | |
192 | |
193 // The THROW... macros should be used to throw an exception. They require a THREAD variable to be | |
194 // visible within the scope containing the THROW. Usually this is achieved by declaring the function | |
195 // with a TRAPS argument. | |
196 | |
197 #define THREAD_AND_LOCATION THREAD, __FILE__, __LINE__ | |
198 | |
199 #define THROW_OOP(e) \ | |
200 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return; } | |
201 | |
202 #define THROW_HANDLE(e) \ | |
203 { Exceptions::_throw(THREAD_AND_LOCATION, e); return; } | |
204 | |
205 #define THROW(name) \ | |
206 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return; } | |
207 | |
208 #define THROW_MSG(name, message) \ | |
209 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return; } | |
210 | |
211 #define THROW_MSG_LOADER(name, message, loader, protection_domain) \ | |
212 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return; } | |
213 | |
214 #define THROW_ARG(name, signature, args) \ | |
215 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return; } | |
216 | |
217 #define THROW_OOP_(e, result) \ | |
218 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return result; } | |
219 | |
220 #define THROW_HANDLE_(e, result) \ | |
221 { Exceptions::_throw(THREAD_AND_LOCATION, e); return result; } | |
222 | |
223 #define THROW_(name, result) \ | |
224 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return result; } | |
225 | |
226 #define THROW_MSG_(name, message, result) \ | |
227 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return result; } | |
228 | |
229 #define THROW_MSG_LOADER_(name, message, loader, protection_domain, result) \ | |
230 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return result; } | |
231 | |
232 #define THROW_ARG_(name, signature, args, result) \ | |
233 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return result; } | |
234 | |
235 #define THROW_MSG_CAUSE_(name, message, cause, result) \ | |
236 { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return result; } | |
237 | |
238 | |
239 #define THROW_OOP_0(e) THROW_OOP_(e, 0) | |
240 #define THROW_HANDLE_0(e) THROW_HANDLE_(e, 0) | |
241 #define THROW_0(name) THROW_(name, 0) | |
242 #define THROW_MSG_0(name, message) THROW_MSG_(name, message, 0) | |
243 #define THROW_WRAPPED_0(name, oop_to_wrap) THROW_WRAPPED_(name, oop_to_wrap, 0) | |
244 #define THROW_ARG_0(name, signature, arg) THROW_ARG_(name, signature, arg, 0) | |
245 #define THROW_MSG_CAUSE_0(name, message, cause) THROW_MSG_CAUSE_(name, message, cause, 0) | |
246 | |
710 | 247 #define THROW_NULL(name) THROW_(name, NULL) |
248 #define THROW_MSG_NULL(name, message) THROW_MSG_(name, message, NULL) | |
249 | |
0 | 250 // The CATCH macro checks that no exception has been thrown by a function; it is used at |
251 // call sites about which is statically known that the callee cannot throw an exception | |
252 // even though it is declared with TRAPS. | |
253 | |
254 #define CATCH \ | |
255 THREAD); if (HAS_PENDING_EXCEPTION) { \ | |
256 oop ex = PENDING_EXCEPTION; \ | |
257 CLEAR_PENDING_EXCEPTION; \ | |
258 ex->print(); \ | |
259 ShouldNotReachHere(); \ | |
260 } (0 | |
261 | |
262 | |
263 // ExceptionMark is a stack-allocated helper class for local exception handling. | |
264 // It is used with the EXCEPTION_MARK macro. | |
265 | |
266 class ExceptionMark { | |
267 private: | |
268 Thread* _thread; | |
269 | |
270 public: | |
271 ExceptionMark(Thread*& thread); | |
272 ~ExceptionMark(); | |
273 }; | |
274 | |
275 | |
276 | |
277 // Use an EXCEPTION_MARK for 'local' exceptions. EXCEPTION_MARK makes sure that no | |
278 // pending exception exists upon entering its scope and tests that no pending exception | |
279 // exists when leaving the scope. | |
280 | |
281 // See also preserveException.hpp for PRESERVE_EXCEPTION_MARK macro, | |
282 // which preserves pre-existing exceptions and does not allow new | |
283 // exceptions. | |
284 | |
285 #define EXCEPTION_MARK Thread* THREAD; ExceptionMark __em(THREAD); | |
1972 | 286 |
287 #endif // SHARE_VM_UTILITIES_EXCEPTIONS_HPP |