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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.
#ifndef V8_EXECUTION_INTERRUPTS_SCOPE_H_
#define V8_EXECUTION_INTERRUPTS_SCOPE_H_
#include "src/execution/isolate.h"
#include "src/execution/stack-guard.h"
namespace v8 {
namespace internal {
class Isolate;
// Scope intercepts only interrupt which is part of its interrupt_mask and does
// not affect other interrupts.
class V8_NODISCARD InterruptsScope {
public:
enum Mode : uint8_t { kPostponeInterrupts, kRunInterrupts, kNoop };
V8_EXPORT_PRIVATE InterruptsScope(Isolate* isolate, uint32_t intercept_mask,
Mode mode)
: stack_guard_(nullptr),
intercept_mask_(intercept_mask),
intercepted_flags_(0),
mode_(mode) {
if (mode_ != kNoop) {
stack_guard_ = isolate->stack_guard();
stack_guard_->PushInterruptsScope(this);
}
}
~InterruptsScope() {
if (mode_ != kNoop) {
stack_guard_->PopInterruptsScope();
}
}
// Find the scope that intercepts this interrupt.
// It may be outermost PostponeInterruptsScope or innermost
// SafeForInterruptsScope if any.
// Return whether the interrupt has been intercepted.
bool Intercept(StackGuard::InterruptFlag flag);
private:
StackGuard* stack_guard_;
InterruptsScope* prev_;
const uint32_t intercept_mask_;
uint32_t intercepted_flags_;
const Mode mode_;
friend class StackGuard;
};
// Support for temporarily postponing interrupts. When the outermost
// postpone scope is left the interrupts will be re-enabled and any
// interrupts that occurred while in the scope will be taken into
// account.
class V8_NODISCARD PostponeInterruptsScope : public InterruptsScope {
public:
explicit PostponeInterruptsScope(
Isolate* isolate, uint32_t intercept_mask = StackGuard::ALL_INTERRUPTS)
: InterruptsScope(isolate, intercept_mask,
InterruptsScope::kPostponeInterrupts) {}
};
// Support for overriding PostponeInterruptsScope. Interrupt is not ignored if
// innermost scope is SafeForInterruptsScope ignoring any outer
// PostponeInterruptsScopes.
class V8_NODISCARD SafeForInterruptsScope : public InterruptsScope {
public:
explicit SafeForInterruptsScope(
Isolate* isolate, uint32_t intercept_mask = StackGuard::ALL_INTERRUPTS)
: InterruptsScope(isolate, intercept_mask,
InterruptsScope::kRunInterrupts) {}
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_INTERRUPTS_SCOPE_H_
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