interrupts-scope.cc

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// Copyright 2019 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 "src/execution/interrupts-scope.h"
 
#include "src/execution/isolate.h"
 
namespace v8 {
namespace internal {
 
bool InterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
  InterruptsScope* last_postpone_scope = nullptr;
  for (InterruptsScope* current = this; current; current = current->prev_) {
    // We only consider scopes related to passed flag.
    if (!(current->intercept_mask_ & flag)) continue;
    if (current->mode_ == kRunInterrupts) {
      // If innermost scope is kRunInterrupts scope, prevent interrupt from
      // being intercepted.
      break;
    } else {
      DCHECK_EQ(current->mode_, kPostponeInterrupts);
      last_postpone_scope = current;
    }
  }
  // If there is no postpone scope for passed flag then we should not intercept.
  if (!last_postpone_scope) return false;
  last_postpone_scope->intercepted_flags_ |= flag;
  return true;
}
 
}  // namespace internal
}  // namespace v8