| // 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. |
| |
| #include <stdlib.h> |
| |
| #include "v8.h" |
| |
| #include "api.h" |
| #include "codegen-inl.h" |
| |
| #ifdef ARM |
| #include "simulator-arm.h" |
| #else // ia32 |
| #include "simulator-ia32.h" |
| #endif |
| |
| #include "debug.h" |
| #include "v8threads.h" |
| |
| namespace v8 { namespace internal { |
| |
| |
| static Handle<Object> Invoke(bool construct, |
| Handle<JSFunction> func, |
| Handle<Object> receiver, |
| int argc, |
| Object*** args, |
| bool* has_pending_exception) { |
| // Make sure we have a real function, not a boilerplate function. |
| ASSERT(!func->IsBoilerplate()); |
| |
| // Entering JavaScript. |
| VMState state(JS); |
| |
| // Guard the stack against too much recursion. |
| StackGuard guard; |
| |
| // Placeholder for return value. |
| Object* value = reinterpret_cast<Object*>(kZapValue); |
| |
| typedef Object* (*JSEntryFunction)( |
| byte* entry, |
| Object* function, |
| Object* receiver, |
| int argc, |
| Object*** args); |
| |
| Handle<Code> code; |
| if (construct) { |
| JSConstructEntryStub stub; |
| code = stub.GetCode(); |
| } else { |
| JSEntryStub stub; |
| code = stub.GetCode(); |
| } |
| |
| { |
| // Save and restore context around invocation and block the |
| // allocation of handles without explicit handle scopes. |
| SaveContext save; |
| NoHandleAllocation na; |
| JSEntryFunction entry = FUNCTION_CAST<JSEntryFunction>(code->entry()); |
| |
| // Call the function through the right JS entry stub. |
| value = CALL_GENERATED_CODE(entry, func->code()->entry(), *func, |
| *receiver, argc, args); |
| } |
| |
| #ifdef DEBUG |
| value->Verify(); |
| #endif |
| |
| // Update the pending exception flag and return the value. |
| *has_pending_exception = value->IsException(); |
| ASSERT(*has_pending_exception == Top::has_pending_exception()); |
| if (*has_pending_exception) { |
| Top::ReportPendingMessages(); |
| return Handle<Object>(); |
| } else { |
| Top::clear_pending_message(); |
| } |
| |
| return Handle<Object>(value); |
| } |
| |
| |
| Handle<Object> Execution::Call(Handle<JSFunction> func, |
| Handle<Object> receiver, |
| int argc, |
| Object*** args, |
| bool* pending_exception) { |
| return Invoke(false, func, receiver, argc, args, pending_exception); |
| } |
| |
| |
| Handle<Object> Execution::New(Handle<JSFunction> func, int argc, |
| Object*** args, bool* pending_exception) { |
| return Invoke(true, func, Top::global(), argc, args, pending_exception); |
| } |
| |
| |
| Handle<Object> Execution::TryCall(Handle<JSFunction> func, |
| Handle<Object> receiver, |
| int argc, |
| Object*** args, |
| bool* caught_exception) { |
| // Enter a try-block while executing the JavaScript code. To avoid |
| // duplicate error printing it must be non-verbose. Also, to avoid |
| // creating message objects during stack overflow we shouldn't |
| // capture messages. |
| v8::TryCatch catcher; |
| catcher.SetVerbose(false); |
| catcher.SetCaptureMessage(false); |
| |
| Handle<Object> result = Invoke(false, func, receiver, argc, args, |
| caught_exception); |
| |
| if (*caught_exception) { |
| ASSERT(catcher.HasCaught()); |
| ASSERT(Top::has_pending_exception()); |
| ASSERT(Top::external_caught_exception()); |
| Top::optional_reschedule_exception(true); |
| result = v8::Utils::OpenHandle(*catcher.Exception()); |
| } |
| |
| ASSERT(!Top::has_pending_exception()); |
| ASSERT(!Top::external_caught_exception()); |
| return result; |
| } |
| |
| |
| Handle<Object> Execution::GetFunctionDelegate(Handle<Object> object) { |
| ASSERT(!object->IsJSFunction()); |
| |
| // If you return a function from here, it will be called when an |
| // attempt is made to call the given object as a function. |
| |
| // The regular expression code here is really meant more as an |
| // example than anything else. KJS does not support calling regular |
| // expressions as functions, but SpiderMonkey does. |
| if (FLAG_call_regexp) { |
| bool is_regexp = |
| object->IsHeapObject() && |
| (HeapObject::cast(*object)->map()->constructor() == |
| *Top::regexp_function()); |
| |
| if (is_regexp) { |
| Handle<String> exec = Factory::exec_symbol(); |
| return Handle<Object>(object->GetProperty(*exec)); |
| } |
| } |
| |
| // Objects created through the API can have an instance-call handler |
| // that should be used when calling the object as a function. |
| if (object->IsHeapObject() && |
| HeapObject::cast(*object)->map()->has_instance_call_handler()) { |
| return Handle<JSFunction>( |
| Top::global_context()->call_as_function_delegate()); |
| } |
| |
| return Factory::undefined_value(); |
| } |
| |
| |
| // Static state for stack guards. |
| StackGuard::ThreadLocal StackGuard::thread_local_; |
| |
| |
| StackGuard::StackGuard() { |
| // NOTE: Overall the StackGuard code assumes that the stack grows towards |
| // lower addresses. |
| ExecutionAccess access; |
| if (thread_local_.nesting_++ == 0) { |
| // Initial StackGuard is being set. We will set the stack limits based on |
| // the current stack pointer allowing the stack to grow kLimitSize from |
| // here. |
| |
| // Ensure that either the stack limits are unset (kIllegalLimit) or that |
| // they indicate a pending interruption. The interrupt limit will be |
| // temporarily reset through the code below and reestablished if the |
| // interrupt flags indicate that an interrupt is pending. |
| ASSERT(thread_local_.jslimit_ == kIllegalLimit || |
| (thread_local_.jslimit_ == kInterruptLimit && |
| thread_local_.interrupt_flags_ != 0)); |
| ASSERT(thread_local_.climit_ == kIllegalLimit || |
| (thread_local_.climit_ == kInterruptLimit && |
| thread_local_.interrupt_flags_ != 0)); |
| |
| thread_local_.initial_jslimit_ = thread_local_.jslimit_ = |
| GENERATED_CODE_STACK_LIMIT(kLimitSize); |
| // NOTE: The check for overflow is not safe as there is no guarantee that |
| // the running thread has its stack in all memory up to address 0x00000000. |
| thread_local_.initial_climit_ = thread_local_.climit_ = |
| reinterpret_cast<uintptr_t>(this) >= kLimitSize ? |
| reinterpret_cast<uintptr_t>(this) - kLimitSize : 0; |
| |
| if (thread_local_.interrupt_flags_ != 0) { |
| set_limits(kInterruptLimit, access); |
| } |
| } |
| // Ensure that proper limits have been set. |
| ASSERT(thread_local_.jslimit_ != kIllegalLimit && |
| thread_local_.climit_ != kIllegalLimit); |
| ASSERT(thread_local_.initial_jslimit_ != kIllegalLimit && |
| thread_local_.initial_climit_ != kIllegalLimit); |
| } |
| |
| |
| StackGuard::~StackGuard() { |
| ExecutionAccess access; |
| if (--thread_local_.nesting_ == 0) { |
| set_limits(kIllegalLimit, access); |
| } |
| } |
| |
| |
| bool StackGuard::IsStackOverflow() { |
| ExecutionAccess access; |
| return (thread_local_.jslimit_ != kInterruptLimit && |
| thread_local_.climit_ != kInterruptLimit); |
| } |
| |
| |
| void StackGuard::EnableInterrupts() { |
| ExecutionAccess access; |
| if (IsSet(access)) { |
| set_limits(kInterruptLimit, access); |
| } |
| } |
| |
| |
| void StackGuard::SetStackLimit(uintptr_t limit) { |
| ExecutionAccess access; |
| // If the current limits are special (eg due to a pending interrupt) then |
| // leave them alone. |
| if (thread_local_.jslimit_ == thread_local_.initial_jslimit_) { |
| thread_local_.jslimit_ = limit; |
| } |
| if (thread_local_.climit_ == thread_local_.initial_climit_) { |
| thread_local_.climit_ = limit; |
| } |
| thread_local_.initial_climit_ = limit; |
| thread_local_.initial_jslimit_ = limit; |
| } |
| |
| |
| void StackGuard::DisableInterrupts() { |
| ExecutionAccess access; |
| reset_limits(access); |
| } |
| |
| |
| bool StackGuard::IsSet(const ExecutionAccess& lock) { |
| return thread_local_.interrupt_flags_ != 0; |
| } |
| |
| |
| bool StackGuard::IsInterrupted() { |
| ExecutionAccess access; |
| return thread_local_.interrupt_flags_ & INTERRUPT; |
| } |
| |
| |
| void StackGuard::Interrupt() { |
| ExecutionAccess access; |
| thread_local_.interrupt_flags_ |= INTERRUPT; |
| set_limits(kInterruptLimit, access); |
| } |
| |
| |
| bool StackGuard::IsPreempted() { |
| ExecutionAccess access; |
| return thread_local_.interrupt_flags_ & PREEMPT; |
| } |
| |
| |
| void StackGuard::Preempt() { |
| ExecutionAccess access; |
| thread_local_.interrupt_flags_ |= PREEMPT; |
| set_limits(kInterruptLimit, access); |
| } |
| |
| |
| bool StackGuard::IsDebugBreak() { |
| ExecutionAccess access; |
| return thread_local_.interrupt_flags_ & DEBUGBREAK; |
| } |
| |
| |
| void StackGuard::DebugBreak() { |
| ExecutionAccess access; |
| thread_local_.interrupt_flags_ |= DEBUGBREAK; |
| set_limits(kInterruptLimit, access); |
| } |
| |
| |
| void StackGuard::Continue(InterruptFlag after_what) { |
| ExecutionAccess access; |
| thread_local_.interrupt_flags_ &= ~static_cast<int>(after_what); |
| if (thread_local_.interrupt_flags_ == 0) { |
| reset_limits(access); |
| } |
| } |
| |
| |
| int StackGuard::ArchiveSpacePerThread() { |
| return sizeof(ThreadLocal); |
| } |
| |
| |
| char* StackGuard::ArchiveStackGuard(char* to) { |
| ExecutionAccess access; |
| memcpy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal)); |
| ThreadLocal blank; |
| thread_local_ = blank; |
| return to + sizeof(ThreadLocal); |
| } |
| |
| |
| char* StackGuard::RestoreStackGuard(char* from) { |
| ExecutionAccess access; |
| memcpy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal)); |
| return from + sizeof(ThreadLocal); |
| } |
| |
| |
| // --- C a l l s t o n a t i v e s --- |
| |
| #define RETURN_NATIVE_CALL(name, argc, argv, has_pending_exception) \ |
| do { \ |
| Object** args[argc] = argv; \ |
| ASSERT(has_pending_exception != NULL); \ |
| return Call(Top::name##_fun(), Top::builtins(), argc, args, \ |
| has_pending_exception); \ |
| } while (false) |
| |
| |
| Handle<Object> Execution::ToBoolean(Handle<Object> obj) { |
| // See the similar code in runtime.js:ToBoolean. |
| if (obj->IsBoolean()) return obj; |
| bool result = true; |
| if (obj->IsString()) { |
| result = Handle<String>::cast(obj)->length() != 0; |
| } else if (obj->IsNull() || obj->IsUndefined()) { |
| result = false; |
| } else if (obj->IsNumber()) { |
| double value = obj->Number(); |
| result = !((value == 0) || isnan(value)); |
| } |
| return Handle<Object>(Heap::ToBoolean(result)); |
| } |
| |
| |
| Handle<Object> Execution::ToNumber(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_number, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToString(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_string, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToDetailString(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_detail_string, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToObject(Handle<Object> obj, bool* exc) { |
| if (obj->IsJSObject()) return obj; |
| RETURN_NATIVE_CALL(to_object, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToInteger(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_integer, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToUint32(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_uint32, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::ToInt32(Handle<Object> obj, bool* exc) { |
| RETURN_NATIVE_CALL(to_int32, 1, { obj.location() }, exc); |
| } |
| |
| |
| Handle<Object> Execution::NewDate(double time, bool* exc) { |
| Handle<Object> time_obj = Factory::NewNumber(time); |
| RETURN_NATIVE_CALL(create_date, 1, { time_obj.location() }, exc); |
| } |
| |
| |
| #undef RETURN_NATIVE_CALL |
| |
| |
| Handle<Object> Execution::CharAt(Handle<String> string, uint32_t index) { |
| int int_index = static_cast<int>(index); |
| if (int_index < 0 || int_index >= string->length()) { |
| return Factory::undefined_value(); |
| } |
| |
| Handle<Object> char_at = |
| GetProperty(Top::builtins(), Factory::char_at_symbol()); |
| if (!char_at->IsJSFunction()) { |
| return Factory::undefined_value(); |
| } |
| |
| bool caught_exception; |
| Handle<Object> index_object = Factory::NewNumberFromInt(int_index); |
| Object** index_arg[] = { index_object.location() }; |
| Handle<Object> result = TryCall(Handle<JSFunction>::cast(char_at), |
| string, |
| ARRAY_SIZE(index_arg), |
| index_arg, |
| &caught_exception); |
| if (caught_exception) { |
| return Factory::undefined_value(); |
| } |
| return result; |
| } |
| |
| |
| Handle<JSFunction> Execution::InstantiateFunction( |
| Handle<FunctionTemplateInfo> data, bool* exc) { |
| // Fast case: see if the function has already been instantiated |
| int serial_number = Smi::cast(data->serial_number())->value(); |
| Object* elm = |
| Top::global_context()->function_cache()->GetElement(serial_number); |
| if (elm->IsJSFunction()) return Handle<JSFunction>(JSFunction::cast(elm)); |
| // The function has not yet been instantiated in this context; do it. |
| Object** args[1] = { Handle<Object>::cast(data).location() }; |
| Handle<Object> result = |
| Call(Top::instantiate_fun(), Top::builtins(), 1, args, exc); |
| if (*exc) return Handle<JSFunction>::null(); |
| return Handle<JSFunction>::cast(result); |
| } |
| |
| |
| Handle<JSObject> Execution::InstantiateObject(Handle<ObjectTemplateInfo> data, |
| bool* exc) { |
| if (data->property_list()->IsUndefined() && |
| !data->constructor()->IsUndefined()) { |
| Object* result; |
| { |
| HandleScope scope; |
| Handle<FunctionTemplateInfo> cons_template = |
| Handle<FunctionTemplateInfo>( |
| FunctionTemplateInfo::cast(data->constructor())); |
| Handle<JSFunction> cons = InstantiateFunction(cons_template, exc); |
| if (*exc) return Handle<JSObject>::null(); |
| Handle<Object> value = New(cons, 0, NULL, exc); |
| if (*exc) return Handle<JSObject>::null(); |
| result = *value; |
| } |
| ASSERT(!*exc); |
| return Handle<JSObject>(JSObject::cast(result)); |
| } else { |
| Object** args[1] = { Handle<Object>::cast(data).location() }; |
| Handle<Object> result = |
| Call(Top::instantiate_fun(), Top::builtins(), 1, args, exc); |
| if (*exc) return Handle<JSObject>::null(); |
| return Handle<JSObject>::cast(result); |
| } |
| } |
| |
| |
| void Execution::ConfigureInstance(Handle<Object> instance, |
| Handle<Object> instance_template, |
| bool* exc) { |
| Object** args[2] = { instance.location(), instance_template.location() }; |
| Execution::Call(Top::configure_instance_fun(), Top::builtins(), 2, args, exc); |
| } |
| |
| |
| Handle<String> Execution::GetStackTraceLine(Handle<Object> recv, |
| Handle<JSFunction> fun, |
| Handle<Object> pos, |
| Handle<Object> is_global) { |
| const int argc = 4; |
| Object** args[argc] = { recv.location(), |
| Handle<Object>::cast(fun).location(), |
| pos.location(), |
| is_global.location() }; |
| bool caught_exception = false; |
| Handle<Object> result = TryCall(Top::get_stack_trace_line_fun(), |
| Top::builtins(), argc, args, |
| &caught_exception); |
| if (caught_exception || !result->IsString()) return Factory::empty_symbol(); |
| return Handle<String>::cast(result); |
| } |
| |
| |
| static Object* RuntimePreempt() { |
| // Clear the preempt request flag. |
| StackGuard::Continue(PREEMPT); |
| |
| ContextSwitcher::PreemptionReceived(); |
| |
| { |
| v8::Unlocker unlocker; |
| Thread::YieldCPU(); |
| } |
| |
| return Heap::undefined_value(); |
| } |
| |
| |
| Object* Execution::DebugBreakHelper() { |
| // Just continue if breaks are disabled. |
| if (Debug::disable_break()) { |
| return Heap::undefined_value(); |
| } |
| |
| // Don't break in system functions. If the current function is |
| // either in the builtins object of some context or is in the debug |
| // context just return with the debug break stack guard active. |
| JavaScriptFrameIterator it; |
| JavaScriptFrame* frame = it.frame(); |
| Object* fun = frame->function(); |
| if (fun->IsJSFunction()) { |
| GlobalObject* global = JSFunction::cast(fun)->context()->global(); |
| if (global->IsJSBuiltinsObject() || Debug::IsDebugGlobal(global)) { |
| return Heap::undefined_value(); |
| } |
| } |
| |
| // Clear the debug request flag. |
| StackGuard::Continue(DEBUGBREAK); |
| |
| HandleScope scope; |
| // Enter the debugger. Just continue if we fail to enter the debugger. |
| EnterDebugger debugger; |
| if (debugger.FailedToEnter()) { |
| return Heap::undefined_value(); |
| } |
| |
| // Notify the debug event listeners. |
| Debugger::OnDebugBreak(Factory::undefined_value()); |
| |
| // Return to continue execution. |
| return Heap::undefined_value(); |
| } |
| |
| |
| Object* Execution::HandleStackGuardInterrupt() { |
| if (StackGuard::IsDebugBreak()) DebugBreakHelper(); |
| if (StackGuard::IsPreempted()) RuntimePreempt(); |
| if (StackGuard::IsInterrupted()) { |
| // interrupt |
| StackGuard::Continue(INTERRUPT); |
| return Top::StackOverflow(); |
| } |
| return Heap::undefined_value(); |
| } |
| |
| // --- G C E x t e n s i o n --- |
| |
| const char* GCExtension::kSource = "native function gc();"; |
| |
| |
| v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunction( |
| v8::Handle<v8::String> str) { |
| return v8::FunctionTemplate::New(GCExtension::GC); |
| } |
| |
| |
| v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) { |
| // All allocation spaces other than NEW_SPACE have the same effect. |
| Heap::CollectGarbage(0, OLD_DATA_SPACE); |
| return v8::Undefined(); |
| } |
| |
| |
| static GCExtension kGCExtension; |
| v8::DeclareExtension kGCExtensionDeclaration(&kGCExtension); |
| |
| } } // namespace v8::internal |