Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/execution.cc b/src/execution.cc
new file mode 100644
index 0000000..8bc6b74
--- /dev/null
+++ b/src/execution.cc
@@ -0,0 +1,698 @@
+// 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"
+
+#if V8_TARGET_ARCH_IA32
+#include "ia32/simulator-ia32.h"
+#elif V8_TARGET_ARCH_X64
+#include "x64/simulator-x64.h"
+#elif V8_TARGET_ARCH_ARM
+#include "arm/simulator-arm.h"
+#else
+#error Unsupported target architecture.
+#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);
+
+ // 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();
+ }
+
+ // Convert calls on global objects to be calls on the global
+ // receiver instead to avoid having a 'this' pointer which refers
+ // directly to a global object.
+ if (receiver->IsGlobalObject()) {
+ Handle<GlobalObject> global = Handle<GlobalObject>::cast(receiver);
+ receiver = Handle<JSObject>(global->global_receiver());
+ }
+
+ {
+ // 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());
+ if (Top::pending_exception() == Heap::termination_exception()) {
+ result = Factory::termination_exception();
+ } else {
+ result = v8::Utils::OpenHandle(*catcher.Exception());
+ }
+ Top::OptionalRescheduleException(true);
+ }
+
+ 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.
+
+ // Regular expressions can be called as functions in both Firefox
+ // and Safari so we allow it too.
+ if (object->IsJSRegExp()) {
+ 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();
+}
+
+
+Handle<Object> Execution::GetConstructorDelegate(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 constructor.
+
+ // 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_constructor_delegate());
+ }
+
+ return Factory::undefined_value();
+}
+
+
+// Static state for stack guards.
+StackGuard::ThreadLocal StackGuard::thread_local_;
+
+
+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.
+ uintptr_t jslimit = SimulatorStack::JsLimitFromCLimit(limit);
+ if (thread_local_.jslimit_ == thread_local_.initial_jslimit_) {
+ thread_local_.jslimit_ = jslimit;
+ Heap::SetStackLimit(jslimit);
+ }
+ if (thread_local_.climit_ == thread_local_.initial_climit_) {
+ thread_local_.climit_ = limit;
+ }
+ thread_local_.initial_climit_ = limit;
+ thread_local_.initial_jslimit_ = jslimit;
+}
+
+
+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::IsTerminateExecution() {
+ ExecutionAccess access;
+ return thread_local_.interrupt_flags_ & TERMINATE;
+}
+
+
+void StackGuard::TerminateExecution() {
+ ExecutionAccess access;
+ thread_local_.interrupt_flags_ |= TERMINATE;
+ set_limits(kInterruptLimit, access);
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+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);
+}
+
+
+bool StackGuard::IsDebugCommand() {
+ ExecutionAccess access;
+ return thread_local_.interrupt_flags_ & DEBUGCOMMAND;
+}
+
+
+void StackGuard::DebugCommand() {
+ if (FLAG_debugger_auto_break) {
+ ExecutionAccess access;
+ thread_local_.interrupt_flags_ |= DEBUGCOMMAND;
+ set_limits(kInterruptLimit, access);
+ }
+}
+#endif
+
+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));
+ Heap::SetStackLimit(thread_local_.jslimit_);
+ return from + sizeof(ThreadLocal);
+}
+
+
+static internal::Thread::LocalStorageKey stack_limit_key =
+ internal::Thread::CreateThreadLocalKey();
+
+
+void StackGuard::FreeThreadResources() {
+ Thread::SetThreadLocal(
+ stack_limit_key,
+ reinterpret_cast<void*>(thread_local_.initial_climit_));
+}
+
+
+void StackGuard::ThreadLocal::Clear() {
+ initial_jslimit_ = kIllegalLimit;
+ jslimit_ = kIllegalLimit;
+ initial_climit_ = kIllegalLimit;
+ climit_ = kIllegalLimit;
+ nesting_ = 0;
+ postpone_interrupts_nesting_ = 0;
+ interrupt_flags_ = 0;
+ Heap::SetStackLimit(kIllegalLimit);
+}
+
+
+void StackGuard::ThreadLocal::Initialize() {
+ if (initial_climit_ == kIllegalLimit) {
+ // Takes the address of the limit variable in order to find out where
+ // the top of stack is right now.
+ intptr_t limit = reinterpret_cast<intptr_t>(&limit) - kLimitSize;
+ initial_jslimit_ = SimulatorStack::JsLimitFromCLimit(limit);
+ jslimit_ = SimulatorStack::JsLimitFromCLimit(limit);
+ initial_climit_ = limit;
+ climit_ = limit;
+ Heap::SetStackLimit(SimulatorStack::JsLimitFromCLimit(limit));
+ }
+ nesting_ = 0;
+ postpone_interrupts_nesting_ = 0;
+ interrupt_flags_ = 0;
+}
+
+
+void StackGuard::ClearThread(const ExecutionAccess& lock) {
+ thread_local_.Clear();
+}
+
+
+void StackGuard::InitThread(const ExecutionAccess& lock) {
+ thread_local_.Initialize();
+ void* stored_limit = Thread::GetThreadLocal(stack_limit_key);
+ // You should hold the ExecutionAccess lock when you call this.
+ if (stored_limit != NULL) {
+ StackGuard::SetStackLimit(reinterpret_cast<intptr_t>(stored_limit));
+ }
+}
+
+
+// --- 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()) {
+ // Initialization to make gcc happy.
+ Object* result = NULL;
+ {
+ 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();
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ if (Debug::InDebugger()) {
+ // If currently in the debugger don't do any actual preemption but record
+ // that preemption occoured while in the debugger.
+ Debug::PreemptionWhileInDebugger();
+ } else {
+ // Perform preemption.
+ v8::Unlocker unlocker;
+ Thread::YieldCPU();
+ }
+#else
+ // Perform preemption.
+ v8::Unlocker unlocker;
+ Thread::YieldCPU();
+#endif
+
+ return Heap::undefined_value();
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+Object* Execution::DebugBreakHelper() {
+ // Just continue if breaks are disabled.
+ if (Debug::disable_break()) {
+ return Heap::undefined_value();
+ }
+
+ {
+ JavaScriptFrameIterator it;
+ ASSERT(!it.done());
+ Object* fun = it.frame()->function();
+ if (fun && fun->IsJSFunction()) {
+ // Don't stop in builtin functions.
+ if (JSFunction::cast(fun)->IsBuiltin()) {
+ return Heap::undefined_value();
+ }
+ GlobalObject* global = JSFunction::cast(fun)->context()->global();
+ // Don't stop in debugger functions.
+ if (Debug::IsDebugGlobal(global)) {
+ return Heap::undefined_value();
+ }
+ }
+ }
+
+ // Collect the break state before clearing the flags.
+ bool debug_command_only =
+ StackGuard::IsDebugCommand() && !StackGuard::IsDebugBreak();
+
+ // Clear the debug request flags.
+ StackGuard::Continue(DEBUGBREAK);
+ StackGuard::Continue(DEBUGCOMMAND);
+
+ 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. Indicate auto continue if the break was
+ // a debug command break.
+ Debugger::OnDebugBreak(Factory::undefined_value(), debug_command_only);
+
+ // Return to continue execution.
+ return Heap::undefined_value();
+}
+#endif
+
+Object* Execution::HandleStackGuardInterrupt() {
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ if (StackGuard::IsDebugBreak() || StackGuard::IsDebugCommand()) {
+ DebugBreakHelper();
+ }
+#endif
+ if (StackGuard::IsPreempted()) RuntimePreempt();
+ if (StackGuard::IsTerminateExecution()) {
+ StackGuard::Continue(TERMINATE);
+ return Top::TerminateExecution();
+ }
+ 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::CollectAllGarbage(false);
+ return v8::Undefined();
+}
+
+
+static GCExtension kGCExtension;
+v8::DeclareExtension kGCExtensionDeclaration(&kGCExtension);
+
+} } // namespace v8::internal