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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 {
InterruptsScope::InterruptsScope(Isolate* isolate, intptr_t intercept_mask,
Mode mode)
: stack_guard_(isolate->stack_guard()),
intercept_mask_(intercept_mask),
intercepted_flags_(0),
mode_(mode) {
if (mode_ != kNoop) stack_guard_->PushInterruptsScope(this);
}
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