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#include <sys/mman.h>
#include <cstddef>
namespace WAVM { namespace Runtime {
class VectorOverMMap
{
public:
VectorOverMMap();
~VectorOverMMap();
VectorOverMMap(const VectorOverMMap& other) = delete;
VectorOverMMap& operator=(const VectorOverMMap& other) = delete;
void grow(size_t morePages);
static constexpr size_t getNumGuardBytes() { return guardPageCount * pageSize; }
size_t getNumReservedBytes() const;
void* getData() const;
private:
void resizeWithDoubling(size_t morePages);
static void* allocateAndProtect(size_t committedPageCount, size_t capacityPageCount);
static void checkForOOM(const char* message);
static constexpr size_t pageSize = 65536;
static constexpr size_t guardPageCount = 2;
size_t committedPageCount = 0;
size_t capacityPageCount = 0;
void* data = nullptr;
};
}}
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