1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef V8_EXECUTION_H_
6 #define V8_EXECUTION_H_
8 #include "src/handles.h"
13 class Execution FINAL : public AllStatic {
15 // Call a function, the caller supplies a receiver and an array
16 // of arguments. Arguments are Object* type. After function returns,
17 // pointers in 'args' might be invalid.
19 // *pending_exception tells whether the invoke resulted in
20 // a pending exception.
22 // When convert_receiver is set, and the receiver is not an object,
23 // and the function called is not in strict mode, receiver is converted to
26 MUST_USE_RESULT static MaybeHandle<Object> Call(
28 Handle<Object> callable,
29 Handle<Object> receiver,
31 Handle<Object> argv[],
32 bool convert_receiver = false);
34 // Construct object from function, the caller supplies an array of
35 // arguments. Arguments are Object* type. After function returns,
36 // pointers in 'args' might be invalid.
38 // *pending_exception tells whether the invoke resulted in
39 // a pending exception.
41 MUST_USE_RESULT static MaybeHandle<Object> New(Handle<JSFunction> func,
43 Handle<Object> argv[]);
45 // Call a function, just like Call(), but make sure to silently catch
46 // any thrown exceptions. The return value is either the result of
47 // calling the function (if caught exception is false) or the exception
48 // that occurred (if caught exception is true).
49 // In the exception case, exception_out holds the caught exceptions, unless
50 // it is a termination exception.
51 static MaybeHandle<Object> TryCall(Handle<JSFunction> func,
52 Handle<Object> receiver, int argc,
53 Handle<Object> argv[],
54 MaybeHandle<Object>* exception_out = NULL);
57 MUST_USE_RESULT static MaybeHandle<Object> ToNumber(
58 Isolate* isolate, Handle<Object> obj);
61 MUST_USE_RESULT static MaybeHandle<Object> ToInteger(
62 Isolate* isolate, Handle<Object> obj);
65 MUST_USE_RESULT static MaybeHandle<Object> ToInt32(
66 Isolate* isolate, Handle<Object> obj);
69 MUST_USE_RESULT static MaybeHandle<Object> ToUint32(
70 Isolate* isolate, Handle<Object> obj);
73 MUST_USE_RESULT static MaybeHandle<Object> ToString(
74 Isolate* isolate, Handle<Object> obj);
77 MUST_USE_RESULT static MaybeHandle<Object> ToDetailString(
78 Isolate* isolate, Handle<Object> obj);
81 MUST_USE_RESULT static MaybeHandle<Object> ToObject(
82 Isolate* isolate, Handle<Object> obj);
84 // Create a new date object from 'time'.
85 MUST_USE_RESULT static MaybeHandle<Object> NewDate(
86 Isolate* isolate, double time);
88 // Create a new regular expression object from 'pattern' and 'flags'.
89 MUST_USE_RESULT static MaybeHandle<JSRegExp> NewJSRegExp(
90 Handle<String> pattern, Handle<String> flags);
92 // Used to implement [] notation on strings (calls JS code)
93 static Handle<Object> CharAt(Handle<String> str, uint32_t index);
95 static Handle<Object> GetFunctionFor();
96 MUST_USE_RESULT static MaybeHandle<JSFunction> InstantiateFunction(
97 Handle<FunctionTemplateInfo> data);
98 MUST_USE_RESULT static MaybeHandle<JSObject> InstantiateObject(
99 Handle<ObjectTemplateInfo> data);
100 MUST_USE_RESULT static MaybeHandle<Object> ConfigureInstance(
101 Isolate* isolate, Handle<Object> instance, Handle<Object> data);
102 static Handle<String> GetStackTraceLine(Handle<Object> recv,
103 Handle<JSFunction> fun,
105 Handle<Object> is_global);
107 // Get a function delegate (or undefined) for the given non-function
108 // object. Used for support calling objects as functions.
109 static Handle<Object> GetFunctionDelegate(Isolate* isolate,
110 Handle<Object> object);
111 MUST_USE_RESULT static MaybeHandle<Object> TryGetFunctionDelegate(
113 Handle<Object> object);
115 // Get a function delegate (or undefined) for the given non-function
116 // object. Used for support calling objects as constructors.
117 static Handle<Object> GetConstructorDelegate(Isolate* isolate,
118 Handle<Object> object);
119 static MaybeHandle<Object> TryGetConstructorDelegate(Isolate* isolate,
120 Handle<Object> object);
124 class ExecutionAccess;
125 class PostponeInterruptsScope;
128 // StackGuard contains the handling of the limits that are used to limit the
129 // number of nested invocations of JavaScript and the stack size used in each
131 class StackGuard FINAL {
133 // Pass the address beyond which the stack should not grow. The stack
134 // is assumed to grow downwards.
135 void SetStackLimit(uintptr_t limit);
137 // Threading support.
138 char* ArchiveStackGuard(char* to);
139 char* RestoreStackGuard(char* from);
140 static int ArchiveSpacePerThread() { return sizeof(ThreadLocal); }
141 void FreeThreadResources();
142 // Sets up the default stack guard for this thread if it has not
143 // already been set up.
144 void InitThread(const ExecutionAccess& lock);
145 // Clears the stack guard for this thread so it does not look as if
146 // it has been set up.
147 void ClearThread(const ExecutionAccess& lock);
149 #define INTERRUPT_LIST(V) \
150 V(DEBUGBREAK, DebugBreak, 0) \
151 V(DEBUGCOMMAND, DebugCommand, 1) \
152 V(TERMINATE_EXECUTION, TerminateExecution, 2) \
153 V(GC_REQUEST, GC, 3) \
154 V(INSTALL_CODE, InstallCode, 4) \
155 V(API_INTERRUPT, ApiInterrupt, 5) \
156 V(DEOPT_MARKED_ALLOCATION_SITES, DeoptMarkedAllocationSites, 6)
158 #define V(NAME, Name, id) \
159 inline bool Check##Name() { return CheckInterrupt(NAME); } \
160 inline void Request##Name() { RequestInterrupt(NAME); } \
161 inline void Clear##Name() { ClearInterrupt(NAME); }
165 // Flag used to set the interrupt causes.
167 #define V(NAME, Name, id) NAME = (1 << id),
170 #define V(NAME, Name, id) NAME |
171 ALL_INTERRUPTS = INTERRUPT_LIST(V) 0
175 // This provides an asynchronous read of the stack limits for the current
176 // thread. There are no locks protecting this, but it is assumed that you
177 // have the global V8 lock if you are using multiple V8 threads.
179 return thread_local_.climit_;
181 uintptr_t real_climit() {
182 return thread_local_.real_climit_;
184 uintptr_t jslimit() {
185 return thread_local_.jslimit_;
187 uintptr_t real_jslimit() {
188 return thread_local_.real_jslimit_;
190 Address address_of_jslimit() {
191 return reinterpret_cast<Address>(&thread_local_.jslimit_);
193 Address address_of_real_jslimit() {
194 return reinterpret_cast<Address>(&thread_local_.real_jslimit_);
197 // If the stack guard is triggered, but it is not an actual
198 // stack overflow, then handle the interruption accordingly.
199 Object* HandleInterrupts();
204 bool CheckInterrupt(InterruptFlag flag);
205 void RequestInterrupt(InterruptFlag flag);
206 void ClearInterrupt(InterruptFlag flag);
207 bool CheckAndClearInterrupt(InterruptFlag flag);
209 // You should hold the ExecutionAccess lock when calling this method.
210 bool has_pending_interrupts(const ExecutionAccess& lock) {
211 return thread_local_.interrupt_flags_ != 0;
214 // You should hold the ExecutionAccess lock when calling this method.
215 inline void set_interrupt_limits(const ExecutionAccess& lock);
217 // Reset limits to actual values. For example after handling interrupt.
218 // You should hold the ExecutionAccess lock when calling this method.
219 inline void reset_limits(const ExecutionAccess& lock);
221 // Enable or disable interrupts.
222 void EnableInterrupts();
223 void DisableInterrupts();
225 #if V8_TARGET_ARCH_64_BIT
226 static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe);
227 static const uintptr_t kIllegalLimit = V8_UINT64_C(0xfffffffffffffff8);
229 static const uintptr_t kInterruptLimit = 0xfffffffe;
230 static const uintptr_t kIllegalLimit = 0xfffffff8;
233 void PushPostponeInterruptsScope(PostponeInterruptsScope* scope);
234 void PopPostponeInterruptsScope();
236 class ThreadLocal FINAL {
238 ThreadLocal() { Clear(); }
239 // You should hold the ExecutionAccess lock when you call Initialize or
243 // Returns true if the heap's stack limits should be set, false if not.
244 bool Initialize(Isolate* isolate);
246 // The stack limit is split into a JavaScript and a C++ stack limit. These
247 // two are the same except when running on a simulator where the C++ and
248 // JavaScript stacks are separate. Each of the two stack limits have two
249 // values. The one eith the real_ prefix is the actual stack limit
250 // set for the VM. The one without the real_ prefix has the same value as
251 // the actual stack limit except when there is an interruption (e.g. debug
252 // break or preemption) in which case it is lowered to make stack checks
253 // fail. Both the generated code and the runtime system check against the
254 // one without the real_ prefix.
255 uintptr_t real_jslimit_; // Actual JavaScript stack limit set for the VM.
257 uintptr_t real_climit_; // Actual C++ stack limit set for the VM.
260 PostponeInterruptsScope* postpone_interrupts_;
261 int interrupt_flags_;
264 // TODO(isolates): Technically this could be calculated directly from a
265 // pointer to StackGuard.
267 ThreadLocal thread_local_;
269 friend class Isolate;
270 friend class StackLimitCheck;
271 friend class PostponeInterruptsScope;
273 DISALLOW_COPY_AND_ASSIGN(StackGuard);
276 } } // namespace v8::internal
278 #endif // V8_EXECUTION_H_