Reland "Add mechanism to postpone interrupts selectively."

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/bootstrapper.h"
@@ skipping 2353 matching lines @@
 #ifdef USE_SIMULATOR
   // The simulator uses a separate JS stack.
   Address jssp_address = Simulator::current(isolate_)->get_sp();
   uintptr_t jssp = reinterpret_cast<uintptr_t>(jssp_address);
   if (jssp < stack_guard->real_jslimit()) return true;
 #endif  // USE_SIMULATOR
   return reinterpret_cast<uintptr_t>(this) < stack_guard->real_climit();
 }
 
 
+bool PostponeInterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
+  // First check whether the previous scope intercepts.
+  if (prev_ && prev_->Intercept(flag)) return true;
+  // Then check whether this scope intercepts.
+  if ((flag & intercept_mask_)) {
+    intercepted_flags_ |= flag;
+    return true;
+  }
+  return false;
+}
+
 } }  // namespace v8::internal