1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef V8_EXECUTION_H_
29 #define V8_EXECUTION_H_
31 #include "allocation.h"
37 // Flag used to set the interrupt causes.
41 DEBUGCOMMAND = 1 << 2,
44 RUNTIME_PROFILER_TICK = 1 << 5,
48 class Execution : public AllStatic {
50 // Call a function, the caller supplies a receiver and an array
51 // of arguments. Arguments are Object* type. After function returns,
52 // pointers in 'args' might be invalid.
54 // *pending_exception tells whether the invoke resulted in
55 // a pending exception.
57 // When convert_receiver is set, and the receiver is not an object,
58 // and the function called is not in strict mode, receiver is converted to
61 static Handle<Object> Call(Handle<Object> callable,
62 Handle<Object> receiver,
64 Handle<Object> argv[],
65 bool* pending_exception,
66 bool convert_receiver = false);
68 // Construct object from function, the caller supplies an array of
69 // arguments. Arguments are Object* type. After function returns,
70 // pointers in 'args' might be invalid.
72 // *pending_exception tells whether the invoke resulted in
73 // a pending exception.
75 static Handle<Object> New(Handle<JSFunction> func,
77 Handle<Object> argv[],
78 bool* pending_exception);
80 // Call a function, just like Call(), but make sure to silently catch
81 // any thrown exceptions. The return value is either the result of
82 // calling the function (if caught exception is false) or the exception
83 // that occurred (if caught exception is true).
84 static Handle<Object> TryCall(Handle<JSFunction> func,
85 Handle<Object> receiver,
87 Handle<Object> argv[],
88 bool* caught_exception);
91 static Handle<Object> ToBoolean(Handle<Object> obj);
94 static Handle<Object> ToNumber(Handle<Object> obj, bool* exc);
97 static Handle<Object> ToInteger(Handle<Object> obj, bool* exc);
100 static Handle<Object> ToInt32(Handle<Object> obj, bool* exc);
103 static Handle<Object> ToUint32(Handle<Object> obj, bool* exc);
106 static Handle<Object> ToString(Handle<Object> obj, bool* exc);
109 static Handle<Object> ToDetailString(Handle<Object> obj, bool* exc);
112 static Handle<Object> ToObject(Handle<Object> obj, bool* exc);
114 // Create a new date object from 'time'.
115 static Handle<Object> NewDate(double time, bool* exc);
117 // Create a new regular expression object from 'pattern' and 'flags'.
118 static Handle<JSRegExp> NewJSRegExp(Handle<String> pattern,
119 Handle<String> flags,
122 // Used to implement [] notation on strings (calls JS code)
123 static Handle<Object> CharAt(Handle<String> str, uint32_t index);
125 static Handle<Object> GetFunctionFor();
126 static Handle<JSFunction> InstantiateFunction(
127 Handle<FunctionTemplateInfo> data, bool* exc);
128 static Handle<JSObject> InstantiateObject(Handle<ObjectTemplateInfo> data,
130 static void ConfigureInstance(Handle<Object> instance,
133 static Handle<String> GetStackTraceLine(Handle<Object> recv,
134 Handle<JSFunction> fun,
136 Handle<Object> is_global);
137 #ifdef ENABLE_DEBUGGER_SUPPORT
138 static Object* DebugBreakHelper();
139 static void ProcessDebugMesssages(bool debug_command_only);
142 // If the stack guard is triggered, but it is not an actual
143 // stack overflow, then handle the interruption accordingly.
144 MUST_USE_RESULT static MaybeObject* HandleStackGuardInterrupt();
146 // Get a function delegate (or undefined) for the given non-function
147 // object. Used for support calling objects as functions.
148 static Handle<Object> GetFunctionDelegate(Handle<Object> object);
149 static Handle<Object> TryGetFunctionDelegate(Handle<Object> object,
150 bool* has_pending_exception);
152 // Get a function delegate (or undefined) for the given non-function
153 // object. Used for support calling objects as constructors.
154 static Handle<Object> GetConstructorDelegate(Handle<Object> object);
155 static Handle<Object> TryGetConstructorDelegate(Handle<Object> object,
156 bool* has_pending_exception);
160 class ExecutionAccess;
164 // StackGuard contains the handling of the limits that are used to limit the
165 // number of nested invocations of JavaScript and the stack size used in each
169 // Pass the address beyond which the stack should not grow. The stack
170 // is assumed to grow downwards.
171 void SetStackLimit(uintptr_t limit);
173 // Threading support.
174 char* ArchiveStackGuard(char* to);
175 char* RestoreStackGuard(char* from);
176 static int ArchiveSpacePerThread() { return sizeof(ThreadLocal); }
177 void FreeThreadResources();
178 // Sets up the default stack guard for this thread if it has not
179 // already been set up.
180 void InitThread(const ExecutionAccess& lock);
181 // Clears the stack guard for this thread so it does not look as if
182 // it has been set up.
183 void ClearThread(const ExecutionAccess& lock);
185 bool IsStackOverflow();
188 bool IsInterrupted();
190 bool IsTerminateExecution();
191 void TerminateExecution();
192 bool IsRuntimeProfilerTick();
193 void RequestRuntimeProfilerTick();
194 #ifdef ENABLE_DEBUGGER_SUPPORT
197 bool IsDebugCommand();
202 void Continue(InterruptFlag after_what);
204 // This provides an asynchronous read of the stack limits for the current
205 // thread. There are no locks protecting this, but it is assumed that you
206 // have the global V8 lock if you are using multiple V8 threads.
208 return thread_local_.climit_;
210 uintptr_t real_climit() {
211 return thread_local_.real_climit_;
213 uintptr_t jslimit() {
214 return thread_local_.jslimit_;
216 uintptr_t real_jslimit() {
217 return thread_local_.real_jslimit_;
219 Address address_of_jslimit() {
220 return reinterpret_cast<Address>(&thread_local_.jslimit_);
222 Address address_of_real_jslimit() {
223 return reinterpret_cast<Address>(&thread_local_.real_jslimit_);
229 // You should hold the ExecutionAccess lock when calling this method.
230 bool has_pending_interrupts(const ExecutionAccess& lock) {
231 // Sanity check: We shouldn't be asking about pending interrupts
232 // unless we're not postponing them anymore.
233 ASSERT(!should_postpone_interrupts(lock));
234 return thread_local_.interrupt_flags_ != 0;
237 // You should hold the ExecutionAccess lock when calling this method.
238 bool should_postpone_interrupts(const ExecutionAccess& lock) {
239 return thread_local_.postpone_interrupts_nesting_ > 0;
242 // You should hold the ExecutionAccess lock when calling this method.
243 inline void set_interrupt_limits(const ExecutionAccess& lock);
245 // Reset limits to actual values. For example after handling interrupt.
246 // You should hold the ExecutionAccess lock when calling this method.
247 inline void reset_limits(const ExecutionAccess& lock);
249 // Enable or disable interrupts.
250 void EnableInterrupts();
251 void DisableInterrupts();
253 #ifdef V8_TARGET_ARCH_X64
254 static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe);
255 static const uintptr_t kIllegalLimit = V8_UINT64_C(0xfffffffffffffff8);
257 static const uintptr_t kInterruptLimit = 0xfffffffe;
258 static const uintptr_t kIllegalLimit = 0xfffffff8;
263 ThreadLocal() { Clear(); }
264 // You should hold the ExecutionAccess lock when you call Initialize or
268 // Returns true if the heap's stack limits should be set, false if not.
269 bool Initialize(Isolate* isolate);
271 // The stack limit is split into a JavaScript and a C++ stack limit. These
272 // two are the same except when running on a simulator where the C++ and
273 // JavaScript stacks are separate. Each of the two stack limits have two
274 // values. The one eith the real_ prefix is the actual stack limit
275 // set for the VM. The one without the real_ prefix has the same value as
276 // the actual stack limit except when there is an interruption (e.g. debug
277 // break or preemption) in which case it is lowered to make stack checks
278 // fail. Both the generated code and the runtime system check against the
279 // one without the real_ prefix.
280 uintptr_t real_jslimit_; // Actual JavaScript stack limit set for the VM.
282 uintptr_t real_climit_; // Actual C++ stack limit set for the VM.
286 int postpone_interrupts_nesting_;
287 int interrupt_flags_;
290 // TODO(isolates): Technically this could be calculated directly from a
291 // pointer to StackGuard.
293 ThreadLocal thread_local_;
295 friend class Isolate;
296 friend class StackLimitCheck;
297 friend class PostponeInterruptsScope;
299 DISALLOW_COPY_AND_ASSIGN(StackGuard);
303 } } // namespace v8::internal
305 #endif // V8_EXECUTION_H_