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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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139 // object. Used for support calling objects as functions. | 139 // object. Used for support calling objects as functions. |
140 static Handle<Object> GetFunctionDelegate(Handle<Object> object); | 140 static Handle<Object> GetFunctionDelegate(Handle<Object> object); |
141 | 141 |
142 // Get a function delegate (or undefined) for the given non-function | 142 // Get a function delegate (or undefined) for the given non-function |
143 // object. Used for support calling objects as constructors. | 143 // object. Used for support calling objects as constructors. |
144 static Handle<Object> GetConstructorDelegate(Handle<Object> object); | 144 static Handle<Object> GetConstructorDelegate(Handle<Object> object); |
145 }; | 145 }; |
146 | 146 |
147 | 147 |
148 class ExecutionAccess; | 148 class ExecutionAccess; |
| 149 class Isolate; |
149 | 150 |
150 | 151 |
151 // StackGuard contains the handling of the limits that are used to limit the | 152 // StackGuard contains the handling of the limits that are used to limit the |
152 // number of nested invocations of JavaScript and the stack size used in each | 153 // number of nested invocations of JavaScript and the stack size used in each |
153 // invocation. | 154 // invocation. |
154 class StackGuard : public AllStatic { | 155 class StackGuard { |
155 public: | 156 public: |
156 // Pass the address beyond which the stack should not grow. The stack | 157 // Pass the address beyond which the stack should not grow. The stack |
157 // is assumed to grow downwards. | 158 // is assumed to grow downwards. |
158 static void SetStackLimit(uintptr_t limit); | 159 void SetStackLimit(uintptr_t limit); |
159 | 160 |
160 // Threading support. | 161 // Threading support. |
161 static char* ArchiveStackGuard(char* to); | 162 char* ArchiveStackGuard(char* to); |
162 static char* RestoreStackGuard(char* from); | 163 char* RestoreStackGuard(char* from); |
163 static int ArchiveSpacePerThread(); | 164 static int ArchiveSpacePerThread() { return sizeof(ThreadLocal); } |
164 static void FreeThreadResources(); | 165 void FreeThreadResources(); |
165 // Sets up the default stack guard for this thread if it has not | 166 // Sets up the default stack guard for this thread if it has not |
166 // already been set up. | 167 // already been set up. |
167 static void InitThread(const ExecutionAccess& lock); | 168 void InitThread(const ExecutionAccess& lock); |
168 // Clears the stack guard for this thread so it does not look as if | 169 // Clears the stack guard for this thread so it does not look as if |
169 // it has been set up. | 170 // it has been set up. |
170 static void ClearThread(const ExecutionAccess& lock); | 171 void ClearThread(const ExecutionAccess& lock); |
171 | 172 |
172 static bool IsStackOverflow(); | 173 bool IsStackOverflow(); |
173 static bool IsPreempted(); | 174 bool IsPreempted(); |
174 static void Preempt(); | 175 void Preempt(); |
175 static bool IsInterrupted(); | 176 bool IsInterrupted(); |
176 static void Interrupt(); | 177 void Interrupt(); |
177 static bool IsTerminateExecution(); | 178 bool IsTerminateExecution(); |
178 static void TerminateExecution(); | 179 void TerminateExecution(); |
179 static bool IsRuntimeProfilerTick(); | 180 bool IsRuntimeProfilerTick(); |
180 static void RequestRuntimeProfilerTick(); | 181 void RequestRuntimeProfilerTick(); |
181 #ifdef ENABLE_DEBUGGER_SUPPORT | 182 #ifdef ENABLE_DEBUGGER_SUPPORT |
182 static bool IsDebugBreak(); | 183 bool IsDebugBreak(); |
183 static void DebugBreak(); | 184 void DebugBreak(); |
184 static bool IsDebugCommand(); | 185 bool IsDebugCommand(); |
185 static void DebugCommand(); | 186 void DebugCommand(); |
186 #endif | 187 #endif |
187 static void Continue(InterruptFlag after_what); | 188 void Continue(InterruptFlag after_what); |
188 | 189 |
189 // This provides an asynchronous read of the stack limits for the current | 190 // This provides an asynchronous read of the stack limits for the current |
190 // thread. There are no locks protecting this, but it is assumed that you | 191 // thread. There are no locks protecting this, but it is assumed that you |
191 // have the global V8 lock if you are using multiple V8 threads. | 192 // have the global V8 lock if you are using multiple V8 threads. |
192 static uintptr_t climit() { | 193 uintptr_t climit() { |
193 return thread_local_.climit_; | 194 return thread_local_.climit_; |
194 } | 195 } |
195 static uintptr_t real_climit() { | 196 uintptr_t real_climit() { |
196 return thread_local_.real_climit_; | 197 return thread_local_.real_climit_; |
197 } | 198 } |
198 static uintptr_t jslimit() { | 199 uintptr_t jslimit() { |
199 return thread_local_.jslimit_; | 200 return thread_local_.jslimit_; |
200 } | 201 } |
201 static uintptr_t real_jslimit() { | 202 uintptr_t real_jslimit() { |
202 return thread_local_.real_jslimit_; | 203 return thread_local_.real_jslimit_; |
203 } | 204 } |
204 static Address address_of_jslimit() { | 205 Address address_of_jslimit() { |
205 return reinterpret_cast<Address>(&thread_local_.jslimit_); | 206 return reinterpret_cast<Address>(&thread_local_.jslimit_); |
206 } | 207 } |
207 static Address address_of_real_jslimit() { | 208 Address address_of_real_jslimit() { |
208 return reinterpret_cast<Address>(&thread_local_.real_jslimit_); | 209 return reinterpret_cast<Address>(&thread_local_.real_jslimit_); |
209 } | 210 } |
210 | 211 |
211 private: | 212 private: |
| 213 StackGuard(); |
| 214 |
212 // You should hold the ExecutionAccess lock when calling this method. | 215 // You should hold the ExecutionAccess lock when calling this method. |
213 static bool has_pending_interrupts(const ExecutionAccess& lock) { | 216 bool has_pending_interrupts(const ExecutionAccess& lock) { |
214 // Sanity check: We shouldn't be asking about pending interrupts | 217 // Sanity check: We shouldn't be asking about pending interrupts |
215 // unless we're not postponing them anymore. | 218 // unless we're not postponing them anymore. |
216 ASSERT(!should_postpone_interrupts(lock)); | 219 ASSERT(!should_postpone_interrupts(lock)); |
217 return thread_local_.interrupt_flags_ != 0; | 220 return thread_local_.interrupt_flags_ != 0; |
218 } | 221 } |
219 | 222 |
220 // You should hold the ExecutionAccess lock when calling this method. | 223 // You should hold the ExecutionAccess lock when calling this method. |
221 static bool should_postpone_interrupts(const ExecutionAccess& lock) { | 224 bool should_postpone_interrupts(const ExecutionAccess& lock) { |
222 return thread_local_.postpone_interrupts_nesting_ > 0; | 225 return thread_local_.postpone_interrupts_nesting_ > 0; |
223 } | 226 } |
224 | 227 |
225 // You should hold the ExecutionAccess lock when calling this method. | 228 // You should hold the ExecutionAccess lock when calling this method. |
226 static void set_interrupt_limits(const ExecutionAccess& lock) { | 229 inline void set_interrupt_limits(const ExecutionAccess& lock); |
227 // Ignore attempts to interrupt when interrupts are postponed. | |
228 if (should_postpone_interrupts(lock)) return; | |
229 thread_local_.jslimit_ = kInterruptLimit; | |
230 thread_local_.climit_ = kInterruptLimit; | |
231 Heap::SetStackLimits(); | |
232 } | |
233 | 230 |
234 // Reset limits to actual values. For example after handling interrupt. | 231 // Reset limits to actual values. For example after handling interrupt. |
235 // You should hold the ExecutionAccess lock when calling this method. | 232 // You should hold the ExecutionAccess lock when calling this method. |
236 static void reset_limits(const ExecutionAccess& lock) { | 233 inline void reset_limits(const ExecutionAccess& lock); |
237 thread_local_.jslimit_ = thread_local_.real_jslimit_; | |
238 thread_local_.climit_ = thread_local_.real_climit_; | |
239 Heap::SetStackLimits(); | |
240 } | |
241 | 234 |
242 // Enable or disable interrupts. | 235 // Enable or disable interrupts. |
243 static void EnableInterrupts(); | 236 void EnableInterrupts(); |
244 static void DisableInterrupts(); | 237 void DisableInterrupts(); |
245 | 238 |
246 #ifdef V8_TARGET_ARCH_X64 | 239 #ifdef V8_TARGET_ARCH_X64 |
247 static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe); | 240 static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe); |
248 static const uintptr_t kIllegalLimit = V8_UINT64_C(0xfffffffffffffff8); | 241 static const uintptr_t kIllegalLimit = V8_UINT64_C(0xfffffffffffffff8); |
249 #else | 242 #else |
250 static const uintptr_t kInterruptLimit = 0xfffffffe; | 243 static const uintptr_t kInterruptLimit = 0xfffffffe; |
251 static const uintptr_t kIllegalLimit = 0xfffffff8; | 244 static const uintptr_t kIllegalLimit = 0xfffffff8; |
252 #endif | 245 #endif |
253 | 246 |
254 class ThreadLocal { | 247 class ThreadLocal { |
255 public: | 248 public: |
256 ThreadLocal() { Clear(); } | 249 ThreadLocal() { Clear(); } |
257 // You should hold the ExecutionAccess lock when you call Initialize or | 250 // You should hold the ExecutionAccess lock when you call Initialize or |
258 // Clear. | 251 // Clear. |
259 void Initialize(); | |
260 void Clear(); | 252 void Clear(); |
261 | 253 |
| 254 // Returns true if the heap's stack limits should be set, false if not. |
| 255 bool Initialize(); |
| 256 |
262 // The stack limit is split into a JavaScript and a C++ stack limit. These | 257 // The stack limit is split into a JavaScript and a C++ stack limit. These |
263 // two are the same except when running on a simulator where the C++ and | 258 // two are the same except when running on a simulator where the C++ and |
264 // JavaScript stacks are separate. Each of the two stack limits have two | 259 // JavaScript stacks are separate. Each of the two stack limits have two |
265 // values. The one eith the real_ prefix is the actual stack limit | 260 // values. The one eith the real_ prefix is the actual stack limit |
266 // set for the VM. The one without the real_ prefix has the same value as | 261 // set for the VM. The one without the real_ prefix has the same value as |
267 // the actual stack limit except when there is an interruption (e.g. debug | 262 // the actual stack limit except when there is an interruption (e.g. debug |
268 // break or preemption) in which case it is lowered to make stack checks | 263 // break or preemption) in which case it is lowered to make stack checks |
269 // fail. Both the generated code and the runtime system check against the | 264 // fail. Both the generated code and the runtime system check against the |
270 // one without the real_ prefix. | 265 // one without the real_ prefix. |
271 uintptr_t real_jslimit_; // Actual JavaScript stack limit set for the VM. | 266 uintptr_t real_jslimit_; // Actual JavaScript stack limit set for the VM. |
272 uintptr_t jslimit_; | 267 uintptr_t jslimit_; |
273 uintptr_t real_climit_; // Actual C++ stack limit set for the VM. | 268 uintptr_t real_climit_; // Actual C++ stack limit set for the VM. |
274 uintptr_t climit_; | 269 uintptr_t climit_; |
275 | 270 |
276 int nesting_; | 271 int nesting_; |
277 int postpone_interrupts_nesting_; | 272 int postpone_interrupts_nesting_; |
278 int interrupt_flags_; | 273 int interrupt_flags_; |
279 }; | 274 }; |
280 | 275 |
281 static ThreadLocal thread_local_; | 276 // TODO(isolates): Technically this could be calculated directly from a |
| 277 // pointer to StackGuard. |
| 278 Isolate* isolate_; |
| 279 ThreadLocal thread_local_; |
282 | 280 |
| 281 friend class Isolate; |
283 friend class StackLimitCheck; | 282 friend class StackLimitCheck; |
284 friend class PostponeInterruptsScope; | 283 friend class PostponeInterruptsScope; |
| 284 |
| 285 DISALLOW_COPY_AND_ASSIGN(StackGuard); |
285 }; | 286 }; |
286 | 287 |
287 | 288 |
288 // Support for checking for stack-overflows in C++ code. | |
289 class StackLimitCheck BASE_EMBEDDED { | |
290 public: | |
291 bool HasOverflowed() const { | |
292 // Stack has overflowed in C++ code only if stack pointer exceeds the C++ | |
293 // stack guard and the limits are not set to interrupt values. | |
294 // TODO(214): Stack overflows are ignored if a interrupt is pending. This | |
295 // code should probably always use the initial C++ limit. | |
296 return (reinterpret_cast<uintptr_t>(this) < StackGuard::climit()) && | |
297 StackGuard::IsStackOverflow(); | |
298 } | |
299 }; | |
300 | |
301 | |
302 // Support for temporarily postponing interrupts. When the outermost | |
303 // postpone scope is left the interrupts will be re-enabled and any | |
304 // interrupts that occurred while in the scope will be taken into | |
305 // account. | |
306 class PostponeInterruptsScope BASE_EMBEDDED { | |
307 public: | |
308 PostponeInterruptsScope() { | |
309 StackGuard::thread_local_.postpone_interrupts_nesting_++; | |
310 StackGuard::DisableInterrupts(); | |
311 } | |
312 | |
313 ~PostponeInterruptsScope() { | |
314 if (--StackGuard::thread_local_.postpone_interrupts_nesting_ == 0) { | |
315 StackGuard::EnableInterrupts(); | |
316 } | |
317 } | |
318 }; | |
319 | |
320 } } // namespace v8::internal | 289 } } // namespace v8::internal |
321 | 290 |
322 #endif // V8_EXECUTION_H_ | 291 #endif // V8_EXECUTION_H_ |
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