Mercurial > hg > truffle
annotate src/share/vm/utilities/exceptions.hpp @ 7582:aefb345d3f5e
7199207: NPG: Crash in PlaceholderTable::verify after StackOverflow
Summary: Reduce scope of placeholder table entries to improve cleanup
Reviewed-by: dholmes, coleenp
| author | acorn |
|---|---|
| date | Thu, 10 Jan 2013 17:38:20 -0500 |
| parents | d17383603741 |
| children | 6b6cbd8b8914 ef57c43512d6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2013, 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; | |
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53 class Symbol; |
| 0 | 54 class JavaCallArguments; |
| 55 | |
| 56 // The ThreadShadow class is a helper class to access the _pending_exception | |
| 57 // field of the Thread class w/o having access to the Thread's interface (for | |
| 58 // include hierachy reasons). | |
| 59 | |
| 6197 | 60 class ThreadShadow: public CHeapObj<mtThread> { |
| 3939 | 61 friend class VMStructs; |
| 62 | |
| 0 | 63 protected: |
| 64 oop _pending_exception; // Thread has gc actions. | |
| 65 const char* _exception_file; // file information for exception (debugging only) | |
| 66 int _exception_line; // line information for exception (debugging only) | |
| 67 friend void check_ThreadShadow(); // checks _pending_exception offset | |
| 68 | |
| 69 // The following virtual exists only to force creation of a vtable. | |
| 70 // We need ThreadShadow to have a vtable, even in product builds, | |
| 71 // so that its layout will start at an offset of zero relative to Thread. | |
| 72 // Some C++ compilers are so "clever" that they put the ThreadShadow | |
| 73 // base class at offset 4 in Thread (after Thread's vtable), if they | |
| 74 // notice that Thread has a vtable but ThreadShadow does not. | |
| 75 virtual void unused_initial_virtual() { } | |
| 76 | |
| 77 public: | |
| 78 oop pending_exception() const { return _pending_exception; } | |
| 79 bool has_pending_exception() const { return _pending_exception != NULL; } | |
| 80 const char* exception_file() const { return _exception_file; } | |
| 81 int exception_line() const { return _exception_line; } | |
| 82 | |
| 83 // Code generation support | |
| 84 static ByteSize pending_exception_offset() { return byte_offset_of(ThreadShadow, _pending_exception); } | |
| 85 | |
| 86 // use THROW whenever possible! | |
| 87 void set_pending_exception(oop exception, const char* file, int line); | |
| 88 | |
| 89 // use CLEAR_PENDING_EXCEPTION whenever possible! | |
| 90 void clear_pending_exception(); | |
| 91 | |
| 92 ThreadShadow() : _pending_exception(NULL), | |
| 93 _exception_file(NULL), _exception_line(0) {} | |
| 94 }; | |
| 95 | |
| 96 | |
| 97 // Exceptions is a helper class that encapsulates all operations | |
| 98 // that require access to the thread interface and which are | |
| 99 // relatively rare. The Exceptions operations should only be | |
| 100 // used directly if the macros below are insufficient. | |
| 101 | |
| 102 class Exceptions { | |
| 103 static bool special_exception(Thread *thread, const char* file, int line, Handle exception); | |
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104 static bool special_exception(Thread* thread, const char* file, int line, Symbol* name, const char* message); |
| 0 | 105 public: |
| 106 // this enum is defined to indicate whether it is safe to | |
| 107 // ignore the encoding scheme of the original message string. | |
| 108 typedef enum { | |
| 109 safe_to_utf8 = 0, | |
| 110 unsafe_to_utf8 = 1 | |
| 111 } ExceptionMsgToUtf8Mode; | |
| 112 // Throw exceptions: w/o message, w/ message & with formatted message. | |
| 113 static void _throw_oop(Thread* thread, const char* file, int line, oop exception); | |
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114 static void _throw(Thread* thread, const char* file, int line, Handle exception, const char* msg = NULL); |
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115 |
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116 static void _throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message); |
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117 static void _throw_msg(Thread* thread, const char* file, int line, Symbol* name, const char* message, |
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118 Handle loader, Handle protection_domain); |
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119 |
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120 static void _throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause); |
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121 static void _throw_msg_cause(Thread* thread, const char* file, int line, Symbol* name, const char* message, Handle h_cause, |
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122 Handle h_loader, Handle h_protection_domain); |
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123 |
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124 static void _throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause); |
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125 static void _throw_cause(Thread* thread, const char* file, int line, Symbol* name, Handle h_cause, |
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126 Handle h_loader, Handle h_protection_domain); |
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127 |
| 0 | 128 static void _throw_args(Thread* thread, const char* file, int line, |
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129 Symbol* name, Symbol* signature, |
| 0 | 130 JavaCallArguments* args); |
| 131 | |
| 132 // There is no THROW... macro for this method. Caller should remember | |
| 133 // to do a return after calling it. | |
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134 static void fthrow(Thread* thread, const char* file, int line, Symbol* name, |
| 0 | 135 const char* format, ...); |
| 136 | |
| 137 // Create and initialize a new exception | |
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138 static Handle new_exception(Thread* thread, Symbol* name, |
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139 Symbol* signature, JavaCallArguments* args, |
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140 Handle loader, Handle protection_domain); |
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141 |
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142 static Handle new_exception(Thread* thread, Symbol* name, |
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143 Symbol* signature, JavaCallArguments* args, |
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144 Handle cause, |
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145 Handle loader, Handle protection_domain); |
| 0 | 146 |
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147 static Handle new_exception(Thread* thread, Symbol* name, |
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148 Handle cause, |
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149 Handle loader, Handle protection_domain, |
| 0 | 150 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8); |
| 151 | |
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152 static Handle new_exception(Thread* thread, Symbol* name, |
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153 const char* message, Handle cause, |
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154 Handle loader, Handle protection_domain, |
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155 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8); |
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156 |
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157 static Handle new_exception(Thread* thread, Symbol* name, |
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158 const char* message, |
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159 ExceptionMsgToUtf8Mode to_utf8_safe = safe_to_utf8); |
| 0 | 160 |
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161 static void throw_stack_overflow_exception(Thread* thread, const char* file, int line, methodHandle method); |
| 0 | 162 |
| 163 // for AbortVMOnException flag | |
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164 NOT_PRODUCT(static void debug_check_abort(Handle exception, const char* message = NULL);) |
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165 NOT_PRODUCT(static void debug_check_abort(const char *value_string, const char* message = NULL);) |
| 0 | 166 }; |
| 167 | |
| 168 | |
| 169 // The THREAD & TRAPS macros facilitate the declaration of functions that throw exceptions. | |
| 170 // Convention: Use the TRAPS macro as the last argument of such a function; e.g.: | |
| 171 // | |
| 172 // int this_function_may_trap(int x, float y, TRAPS) | |
| 173 | |
| 174 #define THREAD __the_thread__ | |
| 175 #define TRAPS Thread* THREAD | |
| 176 | |
| 177 | |
| 178 // The CHECK... macros should be used to pass along a THREAD reference and to check for pending | |
| 179 // exceptions. In special situations it is necessary to handle pending exceptions explicitly, | |
| 180 // in these cases the PENDING_EXCEPTION helper macros should be used. | |
| 181 // | |
| 182 // Macro naming conventions: Macros that end with _ require a result value to be returned. They | |
| 183 // are for functions with non-void result type. The result value is usually ignored because of | |
| 184 // the exception and is only needed for syntactic correctness. The _0 ending is a shortcut for | |
| 185 // _(0) since this is a frequent case. Example: | |
| 186 // | |
| 187 // int result = this_function_may_trap(x_arg, y_arg, CHECK_0); | |
| 188 // | |
| 189 // CAUTION: make sure that the function call using a CHECK macro is not the only statement of a | |
| 190 // conditional branch w/o enclosing {} braces, since the CHECK macros expand into several state- | |
| 191 // ments! | |
| 192 | |
| 193 #define PENDING_EXCEPTION (((ThreadShadow*)THREAD)->pending_exception()) | |
| 194 #define HAS_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->has_pending_exception()) | |
| 195 #define CLEAR_PENDING_EXCEPTION (((ThreadShadow*)THREAD)->clear_pending_exception()) | |
| 196 | |
| 197 #define CHECK THREAD); if (HAS_PENDING_EXCEPTION) return ; (0 | |
| 198 #define CHECK_(result) THREAD); if (HAS_PENDING_EXCEPTION) return result; (0 | |
| 199 #define CHECK_0 CHECK_(0) | |
| 200 #define CHECK_NH CHECK_(Handle()) | |
| 201 #define CHECK_NULL CHECK_(NULL) | |
| 202 #define CHECK_false CHECK_(false) | |
| 203 | |
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204 #define CHECK_AND_CLEAR THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return; } (0 |
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205 #define CHECK_AND_CLEAR_(result) THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return result; } (0 |
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206 #define CHECK_AND_CLEAR_0 CHECK_AND_CLEAR_(0) |
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207 #define CHECK_AND_CLEAR_NH CHECK_AND_CLEAR_(Handle()) |
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208 #define CHECK_AND_CLEAR_NULL CHECK_AND_CLEAR_(NULL) |
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209 #define CHECK_AND_CLEAR_false CHECK_AND_CLEAR_(false) |
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210 |
| 0 | 211 // The THROW... macros should be used to throw an exception. They require a THREAD variable to be |
| 212 // visible within the scope containing the THROW. Usually this is achieved by declaring the function | |
| 213 // with a TRAPS argument. | |
| 214 | |
| 215 #define THREAD_AND_LOCATION THREAD, __FILE__, __LINE__ | |
| 216 | |
| 217 #define THROW_OOP(e) \ | |
| 218 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return; } | |
| 219 | |
| 220 #define THROW_HANDLE(e) \ | |
| 221 { Exceptions::_throw(THREAD_AND_LOCATION, e); return; } | |
| 222 | |
| 223 #define THROW(name) \ | |
| 224 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return; } | |
| 225 | |
| 226 #define THROW_MSG(name, message) \ | |
| 227 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return; } | |
| 228 | |
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229 #define THROW_CAUSE(name, cause) \ |
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230 { Exceptions::_throw_cause(THREAD_AND_LOCATION, name, cause); return; } |
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231 |
| 0 | 232 #define THROW_MSG_LOADER(name, message, loader, protection_domain) \ |
| 233 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return; } | |
| 234 | |
| 235 #define THROW_ARG(name, signature, args) \ | |
| 236 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return; } | |
| 237 | |
| 238 #define THROW_OOP_(e, result) \ | |
| 239 { Exceptions::_throw_oop(THREAD_AND_LOCATION, e); return result; } | |
| 240 | |
| 241 #define THROW_HANDLE_(e, result) \ | |
| 242 { Exceptions::_throw(THREAD_AND_LOCATION, e); return result; } | |
| 243 | |
| 244 #define THROW_(name, result) \ | |
| 245 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, NULL); return result; } | |
| 246 | |
| 247 #define THROW_MSG_(name, message, result) \ | |
| 248 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message); return result; } | |
| 249 | |
| 250 #define THROW_MSG_LOADER_(name, message, loader, protection_domain, result) \ | |
| 251 { Exceptions::_throw_msg(THREAD_AND_LOCATION, name, message, loader, protection_domain); return result; } | |
| 252 | |
| 253 #define THROW_ARG_(name, signature, args, result) \ | |
| 254 { Exceptions::_throw_args(THREAD_AND_LOCATION, name, signature, args); return result; } | |
| 255 | |
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256 #define THROW_MSG_CAUSE(name, message, cause) \ |
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257 { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return; } |
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258 |
| 0 | 259 #define THROW_MSG_CAUSE_(name, message, cause, result) \ |
| 260 { Exceptions::_throw_msg_cause(THREAD_AND_LOCATION, name, message, cause); return result; } | |
| 261 | |
| 262 | |
| 263 #define THROW_OOP_0(e) THROW_OOP_(e, 0) | |
| 264 #define THROW_HANDLE_0(e) THROW_HANDLE_(e, 0) | |
| 265 #define THROW_0(name) THROW_(name, 0) | |
| 266 #define THROW_MSG_0(name, message) THROW_MSG_(name, message, 0) | |
| 267 #define THROW_WRAPPED_0(name, oop_to_wrap) THROW_WRAPPED_(name, oop_to_wrap, 0) | |
| 268 #define THROW_ARG_0(name, signature, arg) THROW_ARG_(name, signature, arg, 0) | |
| 269 #define THROW_MSG_CAUSE_0(name, message, cause) THROW_MSG_CAUSE_(name, message, cause, 0) | |
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270 #define THROW_MSG_CAUSE_NULL(name, message, cause) THROW_MSG_CAUSE_(name, message, cause, NULL) |
| 0 | 271 |
| 710 | 272 #define THROW_NULL(name) THROW_(name, NULL) |
| 273 #define THROW_MSG_NULL(name, message) THROW_MSG_(name, message, NULL) | |
| 274 | |
| 0 | 275 // The CATCH macro checks that no exception has been thrown by a function; it is used at |
| 276 // call sites about which is statically known that the callee cannot throw an exception | |
| 277 // even though it is declared with TRAPS. | |
| 278 | |
| 279 #define CATCH \ | |
| 280 THREAD); if (HAS_PENDING_EXCEPTION) { \ | |
| 281 oop ex = PENDING_EXCEPTION; \ | |
| 282 CLEAR_PENDING_EXCEPTION; \ | |
| 283 ex->print(); \ | |
| 284 ShouldNotReachHere(); \ | |
| 285 } (0 | |
| 286 | |
| 287 // ExceptionMark is a stack-allocated helper class for local exception handling. | |
| 288 // It is used with the EXCEPTION_MARK macro. | |
| 289 | |
| 290 class ExceptionMark { | |
| 291 private: | |
| 292 Thread* _thread; | |
| 293 | |
| 294 public: | |
| 295 ExceptionMark(Thread*& thread); | |
| 296 ~ExceptionMark(); | |
| 297 }; | |
| 298 | |
| 299 | |
| 300 | |
| 301 // Use an EXCEPTION_MARK for 'local' exceptions. EXCEPTION_MARK makes sure that no | |
| 302 // pending exception exists upon entering its scope and tests that no pending exception | |
| 303 // exists when leaving the scope. | |
| 304 | |
| 305 // See also preserveException.hpp for PRESERVE_EXCEPTION_MARK macro, | |
| 306 // which preserves pre-existing exceptions and does not allow new | |
| 307 // exceptions. | |
| 308 | |
| 309 #define EXCEPTION_MARK Thread* THREAD; ExceptionMark __em(THREAD); | |
| 1972 | 310 |
| 311 #endif // SHARE_VM_UTILITIES_EXCEPTIONS_HPP |