* Made preemption work in Irregexp-native-ia32

src/execution.cc

 // 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
@@ skipping 20 matching lines @@
 
 #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.
@@ skipping 442 matching lines @@
                           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