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104 lines
2.7 KiB
104 lines
2.7 KiB
// Copyright 2018 The Android Open Source Project
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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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// http://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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#pragma once
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#include <inttypes.h>
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#include <stddef.h>
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#include <string.h>
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namespace android {
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namespace base {
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class Stream;
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} // namespace base
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} // namespace android
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namespace android {
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namespace base {
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namespace guest {
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// Class to create sub-allocations in an existing buffer. Similar interface to
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// Pool, but underlying mechanism is different as it's difficult to combine
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// same-size heaps in Pool with a preallocated buffer.
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class SubAllocator {
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public:
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// |pageSize| determines both the alignment of pointers returned
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// and the multiples of space occupied.
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SubAllocator(
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void* buffer,
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uint64_t totalSize,
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uint64_t pageSize);
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// Memory is freed from the perspective of the user of
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// SubAllocator, but the prealloced buffer is not freed.
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~SubAllocator();
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// Snapshotting
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bool save(Stream* stream);
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bool load(Stream* stream);
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bool postLoad(void* postLoadBuffer);
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// returns null if the allocation cannot be satisfied.
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void* alloc(size_t wantedSize);
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// returns true if |ptr| came from alloc(), false otherwise
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bool free(void* ptr);
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void freeAll();
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uint64_t getOffset(void* ptr);
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bool empty() const;
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// Convenience function to allocate an array
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// of objects of type T.
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template <class T>
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T* allocArray(size_t count) {
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size_t bytes = sizeof(T) * count;
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void* res = alloc(bytes);
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return (T*) res;
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}
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char* strDup(const char* toCopy) {
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size_t bytes = strlen(toCopy) + 1;
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void* res = alloc(bytes);
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memset(res, 0x0, bytes);
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memcpy(res, toCopy, bytes);
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return (char*)res;
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}
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char** strDupArray(const char* const* arrayToCopy, size_t count) {
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char** res = allocArray<char*>(count);
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for (size_t i = 0; i < count; i++) {
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res[i] = strDup(arrayToCopy[i]);
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}
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return res;
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}
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void* dupArray(const void* buf, size_t bytes) {
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void* res = alloc(bytes);
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memcpy(res, buf, bytes);
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return res;
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}
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private:
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class Impl;
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Impl* mImpl = nullptr;
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};
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} // namespace guest
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} // namespace base
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} // namespace android
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