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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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39 // Top has static variables used for JavaScript execution. | 39 // Top has static variables used for JavaScript execution. |
40 | 40 |
41 class SaveContext; // Forward decleration. | 41 class SaveContext; // Forward decleration. |
42 | 42 |
43 class ThreadLocalTop BASE_EMBEDDED { | 43 class ThreadLocalTop BASE_EMBEDDED { |
44 public: | 44 public: |
45 // The context where the current execution method is created and for variable | 45 // The context where the current execution method is created and for variable |
46 // lookups. | 46 // lookups. |
47 Context* context_; | 47 Context* context_; |
48 Object* pending_exception_; | 48 Object* pending_exception_; |
49 const char* pending_message_; | |
50 Object* pending_message_obj_; | |
51 Script* pending_message_script_; | |
52 int pending_message_start_pos_; | |
53 int pending_message_end_pos_; | |
54 // Use a separate value for scheduled exceptions to preserve the | 49 // Use a separate value for scheduled exceptions to preserve the |
55 // invariants that hold about pending_exception. We may want to | 50 // invariants that hold about pending_exception. We may want to |
56 // unify them later. | 51 // unify them later. |
57 Object* scheduled_exception_; | 52 Object* scheduled_exception_; |
58 bool external_caught_exception_; | 53 bool external_caught_exception_; |
59 v8::TryCatch* try_catch_handler_; | 54 v8::TryCatch* try_catch_handler_; |
60 SaveContext* save_context_; | 55 SaveContext* save_context_; |
61 v8::TryCatch* catcher_; | 56 v8::TryCatch* catcher_; |
62 | 57 |
63 // Stack. | 58 // Stack. |
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118 static void clear_pending_exception() { | 113 static void clear_pending_exception() { |
119 thread_local_.pending_exception_ = Heap::the_hole_value(); | 114 thread_local_.pending_exception_ = Heap::the_hole_value(); |
120 } | 115 } |
121 | 116 |
122 static Object** pending_exception_address() { | 117 static Object** pending_exception_address() { |
123 return &thread_local_.pending_exception_; | 118 return &thread_local_.pending_exception_; |
124 } | 119 } |
125 static bool has_pending_exception() { | 120 static bool has_pending_exception() { |
126 return !thread_local_.pending_exception_->IsTheHole(); | 121 return !thread_local_.pending_exception_->IsTheHole(); |
127 } | 122 } |
128 static void clear_pending_message() { | |
129 thread_local_.catcher_ = NULL; | |
130 thread_local_.pending_message_ = NULL; | |
131 thread_local_.pending_message_obj_ = Heap::the_hole_value(); | |
132 thread_local_.pending_message_script_ = NULL; | |
133 } | |
134 static v8::TryCatch* try_catch_handler() { | 123 static v8::TryCatch* try_catch_handler() { |
135 return thread_local_.try_catch_handler_; | 124 return thread_local_.try_catch_handler_; |
136 } | 125 } |
137 // This method is called by the api after operations that may throw | 126 // This method is called by the api after operations that may throw |
138 // exceptions. If an exception was thrown and not handled by an external | 127 // exceptions. If an exception was thrown and not handled by an external |
139 // handler the exception is scheduled to be rethrown when we return to running | 128 // handler the exception is scheduled to be rethrown when we return to running |
140 // JavaScript code. If an exception is scheduled true is returned. | 129 // JavaScript code. If an exception is scheduled true is returned. |
141 static bool optional_reschedule_exception(bool is_bottom_call); | 130 static bool optional_reschedule_exception(bool is_bottom_call); |
142 | 131 |
143 static bool* external_caught_exception_address() { | 132 static bool* external_caught_exception_address() { |
144 return &thread_local_.external_caught_exception_; | 133 return &thread_local_.external_caught_exception_; |
145 } | 134 } |
146 | 135 |
147 static Object* scheduled_exception() { | 136 static Object* scheduled_exception() { |
148 ASSERT(has_scheduled_exception()); | 137 ASSERT(has_scheduled_exception()); |
149 return thread_local_.scheduled_exception_; | 138 return thread_local_.scheduled_exception_; |
150 } | 139 } |
151 static bool has_scheduled_exception() { | 140 static bool has_scheduled_exception() { |
152 return !thread_local_.scheduled_exception_->IsTheHole(); | 141 return !thread_local_.scheduled_exception_->IsTheHole(); |
153 } | 142 } |
154 static void clear_scheduled_exception() { | 143 static void clear_scheduled_exception() { |
155 thread_local_.scheduled_exception_ = Heap::the_hole_value(); | 144 thread_local_.scheduled_exception_ = Heap::the_hole_value(); |
156 } | 145 } |
157 | 146 |
158 static void setup_external_caught() { | 147 static void setup_external_caught() { |
159 thread_local_.external_caught_exception_ = | 148 thread_local_.external_caught_exception_ = |
160 (!thread_local_.pending_exception_->IsTheHole()) && | |
161 (thread_local_.catcher_ != NULL) && | 149 (thread_local_.catcher_ != NULL) && |
162 (Top::thread_local_.try_catch_handler_ == Top::thread_local_.catcher_); | 150 (Top::thread_local_.try_catch_handler_ == Top::thread_local_.catcher_); |
163 } | 151 } |
164 | 152 |
165 // Tells whether the current context has experienced an out of memory | 153 // Tells whether the current context has experienced an out of memory |
166 // exception. | 154 // exception. |
167 static bool is_out_of_memory(); | 155 static bool is_out_of_memory(); |
168 | 156 |
169 // JS execution stack (see frames.h). | 157 // JS execution stack (see frames.h). |
170 static Address c_entry_fp(ThreadLocalTop* thread) { | 158 static Address c_entry_fp(ThreadLocalTop* thread) { |
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212 static void ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type); | 200 static void ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type); |
213 | 201 |
214 // Exception throwing support. The caller should use the result | 202 // Exception throwing support. The caller should use the result |
215 // of Throw() as its return value. | 203 // of Throw() as its return value. |
216 static Failure* Throw(Object* exception, MessageLocation* location = NULL); | 204 static Failure* Throw(Object* exception, MessageLocation* location = NULL); |
217 // Re-throw an exception. This involves no error reporting since | 205 // Re-throw an exception. This involves no error reporting since |
218 // error reporting was handled when the exception was thrown | 206 // error reporting was handled when the exception was thrown |
219 // originally. | 207 // originally. |
220 static Failure* ReThrow(Object* exception, MessageLocation* location = NULL); | 208 static Failure* ReThrow(Object* exception, MessageLocation* location = NULL); |
221 static void ScheduleThrow(Object* exception); | 209 static void ScheduleThrow(Object* exception); |
222 static void ReportPendingMessages(); | |
223 | 210 |
224 // Promote a scheduled exception to pending. Asserts has_scheduled_exception. | 211 // Promote a scheduled exception to pending. Asserts has_scheduled_exception. |
225 static Object* PromoteScheduledException(); | 212 static Object* PromoteScheduledException(); |
226 static void DoThrow(Object* exception, | 213 static void DoThrow(Object* exception, |
227 MessageLocation* location, | 214 MessageLocation* location, |
228 const char* message); | 215 const char* message); |
229 static bool ShouldReportException(bool* is_caught_externally); | 216 static bool ShouldReportException(bool* is_caught_externally); |
230 static void ReportUncaughtException(Handle<Object> exception, | 217 static void ReportUncaughtException(Handle<Object> exception, |
231 MessageLocation* location, | 218 MessageLocation* location, |
232 Handle<String> stack_trace); | 219 Handle<String> stack_trace); |
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379 | 366 |
380 class ExecutionAccess BASE_EMBEDDED { | 367 class ExecutionAccess BASE_EMBEDDED { |
381 public: | 368 public: |
382 ExecutionAccess(); | 369 ExecutionAccess(); |
383 ~ExecutionAccess(); | 370 ~ExecutionAccess(); |
384 }; | 371 }; |
385 | 372 |
386 } } // namespace v8::internal | 373 } } // namespace v8::internal |
387 | 374 |
388 #endif // V8_TOP_H_ | 375 #endif // V8_TOP_H_ |
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