Lessica

#import <Foundation/Foundation.h>
#import <os/log.h>

#define FAKE_BASE 0x100000000
#define FAKE_PAGE 4096

template <unsigned B> inline int64_t SignExtend64(uint64_t x) {
    static_assert(B > 0, "Bit width can't be 0.");
    static_assert(B <= 64, "Bit width out of range.");
    return int64_t(x << (64 - B)) >> (64 - B);