108 lines
3.0 KiB
C++
108 lines
3.0 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_PTR_H_
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#define SANDBOXED_API_VAR_PTR_H_
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#include <algorithm>
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#include <cstring>
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#include <memory>
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#include <string>
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#include "absl/base/attributes.h"
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#include "absl/base/macros.h"
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#include "absl/strings/str_format.h"
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#include "sandboxed_api/var_abstract.h"
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#include "sandboxed_api/var_reg.h"
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namespace sapi::v {
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// Class representing a pointer. Takes both Var* and regular pointers in the
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// initializers.
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class Ptr : public Reg<Var*> {
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public:
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Ptr() = delete;
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explicit Ptr(Var* value, SyncType sync_type) : sync_type_(sync_type) {
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Reg<Var*>::SetValue(value);
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}
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Var* GetPointedVar() const { return Reg<Var*>::GetValue(); }
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void SetValue(Var* ptr) final { value_->SetRemote(ptr); }
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Var* GetValue() const final {
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return reinterpret_cast<Var*>(value_->GetRemote());
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}
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const void* GetDataPtr() final {
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remote_ptr_cache_ = GetValue();
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return &remote_ptr_cache_;
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}
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void SetDataFromPtr(const void* ptr, size_t max_sz) final {
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void* tmp;
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memcpy(&tmp, ptr, std::min(sizeof(tmp), max_sz));
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SetValue(reinterpret_cast<Var*>(tmp));
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}
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// Getter/Setter for the sync_type_ field.
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SyncType GetSyncType() { return sync_type_; }
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void SetSyncType(SyncType sync_type) { sync_type_ = sync_type; }
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std::string ToString() const final {
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Var* var = GetPointedVar();
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return absl::StrFormat(
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"Ptr to obj:%p (type:'%s' val:'%s'), local:%p, remote:%p, size:%tx",
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var, var->GetTypeString(), var->ToString(), var->GetLocal(),
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var->GetRemote(), var->GetSize());
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}
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private:
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// GetDataPtr() interface requires of us to return a pointer to the data
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// (variable) that can be copied. We cannot get pointer to pointer with
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// Var::GetRemote(), hence we cache it, and return pointer to it.
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void* remote_ptr_cache_;
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// Shall we synchronize the underlying object before/after call.
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SyncType sync_type_;
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};
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// Good, old nullptr
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class ABSL_DEPRECATED(
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"Use regular `nullptr` or `NULL` instead. This class will eventually get "
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"removed") NullPtr : public Ptr {
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public:
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NullPtr() : Ptr(&void_obj_, SyncType::kSyncNone) {}
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private:
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Reg<void*> void_obj_;
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};
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// Pointer, which can only point to remote memory, and is never synchronized.
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class RemotePtr : public Ptr {
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public:
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explicit RemotePtr(void* remote_addr)
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: Ptr(&pointed_obj_, SyncType::kSyncNone) {
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pointed_obj_.SetRemote(remote_addr);
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}
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private:
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Reg<void*> pointed_obj_;
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};
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} // namespace sapi::v
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#endif // SANDBOXED_API_VAR_PTR_H_
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