135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SANDBOXED_API_VAR_REG_H_
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#define SANDBOXED_API_VAR_REG_H_
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#include <algorithm>
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#include <cstring>
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#include <iostream>
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#include <string>
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#include <type_traits>
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#include "absl/strings/str_format.h"
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#include "sandboxed_api/var_abstract.h"
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namespace sapi::v {
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// The super-class for Reg. Specified as a class, so it can be used as a
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// type specifier in methods.
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class Callable : public Var {
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public:
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// Get pointer to the stored data.
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virtual const void* GetDataPtr() = 0;
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// Set internal data from ptr.
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virtual void SetDataFromPtr(const void* ptr, size_t max_sz) = 0;
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// Get data from internal ptr.
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void GetDataFromPtr(void* ptr, size_t max_sz) {
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size_t min_sz = std::min<size_t>(GetSize(), max_sz);
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memcpy(ptr, GetDataPtr(), min_sz);
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}
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protected:
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Callable() = default;
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};
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// class Reg represents register-sized variables.
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template <typename T>
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class Reg : public Callable {
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public:
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static_assert(std::is_integral_v<T> || std::is_floating_point_v<T> ||
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std::is_pointer_v<T> || std::is_enum_v<T>,
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"Only register-sized types are allowed as template argument "
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"for class Reg.");
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explicit Reg(const T value = {}) {
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value_ = value;
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SetLocal(&value_);
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}
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// Getter/Setter for the stored value.
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virtual T GetValue() const { return value_; }
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virtual void SetValue(T value) { value_ = value; }
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const void* GetDataPtr() override {
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return reinterpret_cast<const void*>(&value_);
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}
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void SetDataFromPtr(const void* ptr, size_t max_sz) override {
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memcpy(&value_, ptr, std::min(GetSize(), max_sz));
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}
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size_t GetSize() const override { return sizeof(T); }
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Type GetType() const override;
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std::string GetTypeString() const override;
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std::string ToString() const override;
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protected:
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// The stored value.
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T value_;
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};
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template <typename T>
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Type Reg<T>::GetType() const {
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if constexpr (std::is_integral_v<T> || std::is_enum_v<T>) {
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return Type::kInt;
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}
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if constexpr (std::is_floating_point_v<T>) {
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return Type::kFloat;
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}
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if constexpr (std::is_pointer_v<T>) {
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return Type::kPointer;
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}
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// Not reached
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}
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template <typename T>
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std::string Reg<T>::GetTypeString() const {
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if constexpr (std::is_integral_v<T> || std::is_enum_v<T>) {
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return "Integer";
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}
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if constexpr (std::is_floating_point_v<T>) {
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return "Floating-point";
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}
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if constexpr (std::is_pointer_v<T>) {
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return "Pointer";
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}
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// Not reached
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}
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template <typename T>
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std::string Reg<T>::ToString() const {
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if constexpr (std::is_integral_v<T>) {
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return std::to_string(value_);
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}
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if constexpr (std::is_enum_v<T>) {
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return std::to_string(static_cast<std::underlying_type_t<T>>(value_));
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}
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if constexpr (std::is_floating_point_v<T>) {
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return absl::StrFormat("%.10f", value_);
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}
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if constexpr (std::is_pointer<T>::value) {
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return absl::StrFormat("%p", value_);
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}
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// Not reached.
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}
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} // namespace sapi::v
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#endif // SANDBOXED_API_VAR_REG_H_
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