| // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_EXECUTION_H_ |
| #define V8_EXECUTION_H_ |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // Flag used to set the interrupt causes. |
| enum InterruptFlag { |
| INTERRUPT = 1 << 0, |
| DEBUGBREAK = 1 << 1, |
| DEBUGCOMMAND = 1 << 2, |
| PREEMPT = 1 << 3, |
| TERMINATE = 1 << 4 |
| }; |
| |
| class Execution : public AllStatic { |
| public: |
| // Call a function, the caller supplies a receiver and an array |
| // of arguments. Arguments are Object* type. After function returns, |
| // pointers in 'args' might be invalid. |
| // |
| // *pending_exception tells whether the invoke resulted in |
| // a pending exception. |
| // |
| static Handle<Object> Call(Handle<JSFunction> func, |
| Handle<Object> receiver, |
| int argc, |
| Object*** args, |
| bool* pending_exception); |
| |
| // Construct object from function, the caller supplies an array of |
| // arguments. Arguments are Object* type. After function returns, |
| // pointers in 'args' might be invalid. |
| // |
| // *pending_exception tells whether the invoke resulted in |
| // a pending exception. |
| // |
| static Handle<Object> New(Handle<JSFunction> func, |
| int argc, |
| Object*** args, |
| bool* pending_exception); |
| |
| // Call a function, just like Call(), but make sure to silently catch |
| // any thrown exceptions. The return value is either the result of |
| // calling the function (if caught exception is false) or the exception |
| // that occurred (if caught exception is true). |
| static Handle<Object> TryCall(Handle<JSFunction> func, |
| Handle<Object> receiver, |
| int argc, |
| Object*** args, |
| bool* caught_exception); |
| |
| // ECMA-262 9.2 |
| static Handle<Object> ToBoolean(Handle<Object> obj); |
| |
| // ECMA-262 9.3 |
| static Handle<Object> ToNumber(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.4 |
| static Handle<Object> ToInteger(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.5 |
| static Handle<Object> ToInt32(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.6 |
| static Handle<Object> ToUint32(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.8 |
| static Handle<Object> ToString(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.8 |
| static Handle<Object> ToDetailString(Handle<Object> obj, bool* exc); |
| |
| // ECMA-262 9.9 |
| static Handle<Object> ToObject(Handle<Object> obj, bool* exc); |
| |
| // Create a new date object from 'time'. |
| static Handle<Object> NewDate(double time, bool* exc); |
| |
| // Create a new regular expression object from 'pattern' and 'flags'. |
| static Handle<JSRegExp> NewJSRegExp(Handle<String> pattern, |
| Handle<String> flags, |
| bool* exc); |
| |
| // Used to implement [] notation on strings (calls JS code) |
| static Handle<Object> CharAt(Handle<String> str, uint32_t index); |
| |
| static Handle<Object> GetFunctionFor(); |
| static Handle<JSFunction> InstantiateFunction( |
| Handle<FunctionTemplateInfo> data, bool* exc); |
| static Handle<JSObject> InstantiateObject(Handle<ObjectTemplateInfo> data, |
| bool* exc); |
| static void ConfigureInstance(Handle<Object> instance, |
| Handle<Object> data, |
| bool* exc); |
| static Handle<String> GetStackTraceLine(Handle<Object> recv, |
| Handle<JSFunction> fun, |
| Handle<Object> pos, |
| Handle<Object> is_global); |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| static Object* DebugBreakHelper(); |
| static void ProcessDebugMesssages(bool debug_command_only); |
| #endif |
| |
| // If the stack guard is triggered, but it is not an actual |
| // stack overflow, then handle the interruption accordingly. |
| static Object* HandleStackGuardInterrupt(); |
| |
| // Get a function delegate (or undefined) for the given non-function |
| // object. Used for support calling objects as functions. |
| static Handle<Object> GetFunctionDelegate(Handle<Object> object); |
| |
| // Get a function delegate (or undefined) for the given non-function |
| // object. Used for support calling objects as constructors. |
| static Handle<Object> GetConstructorDelegate(Handle<Object> object); |
| }; |
| |
| |
| class ExecutionAccess; |
| |
| |
| // StackGuard contains the handling of the limits that are used to limit the |
| // number of nested invocations of JavaScript and the stack size used in each |
| // invocation. |
| class StackGuard : public AllStatic { |
| public: |
| // Pass the address beyond which the stack should not grow. The stack |
| // is assumed to grow downwards. |
| static void SetStackLimit(uintptr_t limit); |
| |
| // Threading support. |
| static char* ArchiveStackGuard(char* to); |
| static char* RestoreStackGuard(char* from); |
| static int ArchiveSpacePerThread(); |
| static void FreeThreadResources(); |
| // Sets up the default stack guard for this thread if it has not |
| // already been set up. |
| static void InitThread(const ExecutionAccess& lock); |
| // Clears the stack guard for this thread so it does not look as if |
| // it has been set up. |
| static void ClearThread(const ExecutionAccess& lock); |
| |
| static bool IsStackOverflow(); |
| static bool IsPreempted(); |
| static void Preempt(); |
| static bool IsInterrupted(); |
| static void Interrupt(); |
| static bool IsTerminateExecution(); |
| static void TerminateExecution(); |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| static bool IsDebugBreak(); |
| static void DebugBreak(); |
| static bool IsDebugCommand(); |
| static void DebugCommand(); |
| #endif |
| static void Continue(InterruptFlag after_what); |
| |
| // This provides an asynchronous read of the stack limits for the current |
| // thread. There are no locks protecting this, but it is assumed that you |
| // have the global V8 lock if you are using multiple V8 threads. |
| static uintptr_t climit() { |
| return thread_local_.climit_; |
| } |
| static uintptr_t jslimit() { |
| return thread_local_.jslimit_; |
| } |
| static uintptr_t real_jslimit() { |
| return thread_local_.real_jslimit_; |
| } |
| static Address address_of_jslimit() { |
| return reinterpret_cast<Address>(&thread_local_.jslimit_); |
| } |
| static Address address_of_real_jslimit() { |
| return reinterpret_cast<Address>(&thread_local_.real_jslimit_); |
| } |
| |
| private: |
| // You should hold the ExecutionAccess lock when calling this method. |
| static bool has_pending_interrupts(const ExecutionAccess& lock) { |
| // Sanity check: We shouldn't be asking about pending interrupts |
| // unless we're not postponing them anymore. |
| ASSERT(!should_postpone_interrupts(lock)); |
| return thread_local_.interrupt_flags_ != 0; |
| } |
| |
| // You should hold the ExecutionAccess lock when calling this method. |
| static bool should_postpone_interrupts(const ExecutionAccess& lock) { |
| return thread_local_.postpone_interrupts_nesting_ > 0; |
| } |
| |
| // You should hold the ExecutionAccess lock when calling this method. |
| static void set_interrupt_limits(const ExecutionAccess& lock) { |
| // Ignore attempts to interrupt when interrupts are postponed. |
| if (should_postpone_interrupts(lock)) return; |
| thread_local_.jslimit_ = kInterruptLimit; |
| thread_local_.climit_ = kInterruptLimit; |
| Heap::SetStackLimits(); |
| } |
| |
| // Reset limits to actual values. For example after handling interrupt. |
| // You should hold the ExecutionAccess lock when calling this method. |
| static void reset_limits(const ExecutionAccess& lock) { |
| thread_local_.jslimit_ = thread_local_.real_jslimit_; |
| thread_local_.climit_ = thread_local_.real_climit_; |
| Heap::SetStackLimits(); |
| } |
| |
| // Enable or disable interrupts. |
| static void EnableInterrupts(); |
| static void DisableInterrupts(); |
| |
| static const uintptr_t kLimitSize = kPointerSize * 128 * KB; |
| |
| #ifdef V8_TARGET_ARCH_X64 |
| static const uintptr_t kInterruptLimit = V8_UINT64_C(0xfffffffffffffffe); |
| static const uintptr_t kIllegalLimit = V8_UINT64_C(0xfffffffffffffff8); |
| #else |
| static const uintptr_t kInterruptLimit = 0xfffffffe; |
| static const uintptr_t kIllegalLimit = 0xfffffff8; |
| #endif |
| |
| class ThreadLocal { |
| public: |
| ThreadLocal() { Clear(); } |
| // You should hold the ExecutionAccess lock when you call Initialize or |
| // Clear. |
| void Initialize(); |
| void Clear(); |
| |
| // The stack limit is split into a JavaScript and a C++ stack limit. These |
| // two are the same except when running on a simulator where the C++ and |
| // JavaScript stacks are separate. Each of the two stack limits have two |
| // values. The one eith the real_ prefix is the actual stack limit |
| // set for the VM. The one without the real_ prefix has the same value as |
| // the actual stack limit except when there is an interruption (e.g. debug |
| // break or preemption) in which case it is lowered to make stack checks |
| // fail. Both the generated code and the runtime system check against the |
| // one without the real_ prefix. |
| uintptr_t real_jslimit_; // Actual JavaScript stack limit set for the VM. |
| uintptr_t jslimit_; |
| uintptr_t real_climit_; // Actual C++ stack limit set for the VM. |
| uintptr_t climit_; |
| |
| int nesting_; |
| int postpone_interrupts_nesting_; |
| int interrupt_flags_; |
| }; |
| |
| static ThreadLocal thread_local_; |
| |
| friend class StackLimitCheck; |
| friend class PostponeInterruptsScope; |
| }; |
| |
| |
| // Support for checking for stack-overflows in C++ code. |
| class StackLimitCheck BASE_EMBEDDED { |
| public: |
| bool HasOverflowed() const { |
| // Stack has overflowed in C++ code only if stack pointer exceeds the C++ |
| // stack guard and the limits are not set to interrupt values. |
| // TODO(214): Stack overflows are ignored if a interrupt is pending. This |
| // code should probably always use the initial C++ limit. |
| return (reinterpret_cast<uintptr_t>(this) < StackGuard::climit()) && |
| StackGuard::IsStackOverflow(); |
| } |
| }; |
| |
| |
| // Support for temporarily postponing interrupts. When the outermost |
| // postpone scope is left the interrupts will be re-enabled and any |
| // interrupts that occurred while in the scope will be taken into |
| // account. |
| class PostponeInterruptsScope BASE_EMBEDDED { |
| public: |
| PostponeInterruptsScope() { |
| StackGuard::thread_local_.postpone_interrupts_nesting_++; |
| StackGuard::DisableInterrupts(); |
| } |
| |
| ~PostponeInterruptsScope() { |
| if (--StackGuard::thread_local_.postpone_interrupts_nesting_ == 0) { |
| StackGuard::EnableInterrupts(); |
| } |
| } |
| }; |
| |
| |
| class GCExtension : public v8::Extension { |
| public: |
| GCExtension() : v8::Extension("v8/gc", kSource) {} |
| virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction( |
| v8::Handle<v8::String> name); |
| static v8::Handle<v8::Value> GC(const v8::Arguments& args); |
| private: |
| static const char* const kSource; |
| }; |
| |
| |
| class ExternalizeStringExtension : public v8::Extension { |
| public: |
| ExternalizeStringExtension() : v8::Extension("v8/externalize", kSource) {} |
| virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction( |
| v8::Handle<v8::String> name); |
| static v8::Handle<v8::Value> Externalize(const v8::Arguments& args); |
| static v8::Handle<v8::Value> IsAscii(const v8::Arguments& args); |
| private: |
| static const char* const kSource; |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_EXECUTION_H_ |
