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// Copyright 2014 The Chromium 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 SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_
#define SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "sandbox/linux/bpf_dsl/codegen.h"
#include "sandbox/sandbox_export.h"
namespace sandbox {
namespace bpf_dsl {
class ErrorCode;
class PolicyCompiler;
namespace internal {
// Internal interface implemented by BoolExpr implementations.
class BoolExprImpl : public base::RefCounted<BoolExprImpl> {
public:
// Compile uses |pc| to emit a CodeGen::Node that conditionally continues
// to either |then_node| or |false_node|, depending on whether the represented
// boolean expression is true or false.
virtual CodeGen::Node Compile(PolicyCompiler* pc,
CodeGen::Node then_node,
CodeGen::Node else_node) const = 0;
protected:
BoolExprImpl() {}
virtual ~BoolExprImpl() {}
private:
friend class base::RefCounted<BoolExprImpl>;
DISALLOW_COPY_AND_ASSIGN(BoolExprImpl);
};
// Internal interface implemented by ResultExpr implementations.
class ResultExprImpl : public base::RefCounted<ResultExprImpl> {
public:
// Compile uses |pc| to emit a CodeGen::Node that executes the
// represented result expression.
virtual CodeGen::Node Compile(PolicyCompiler* pc) const = 0;
// HasUnsafeTraps returns whether the result expression is or recursively
// contains an unsafe trap expression.
virtual bool HasUnsafeTraps() const;
// IsAllow returns whether the result expression is an "allow" result.
virtual bool IsAllow() const;
// IsAllow returns whether the result expression is a "deny" result.
virtual bool IsDeny() const;
protected:
ResultExprImpl() {}
virtual ~ResultExprImpl() {}
private:
friend class base::RefCounted<ResultExprImpl>;
DISALLOW_COPY_AND_ASSIGN(ResultExprImpl);
};
} // namespace internal
} // namespace bpf_dsl
} // namespace sandbox
#endif // SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_
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