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/*
a sample to use MmapAllocator with an user-defined name
cat /proc/`pidof ./memfd`/maps
7fca70b44000-7fca70b4a000 rw-p 00000000 00:00 0
7fca70b67000-7fca70b68000 rwxs 00000000 00:05 19960170 /memfd:xyz (deleted)
7fca70b68000-7fca70b69000 rwxs 00000000 00:05 19960169 /memfd:abc (deleted)
7fca70b69000-7fca70b6a000 r--p 00029000 103:03 19136541 /lib/x86_64-linux-gnu/ld-2.27.so
7fca70b6a000-7fca70b6b000 rw-p 0002a000 103:03 19136541 /lib/x86_64-linux-gnu/ld-2.27.so
*/
#define XBYAK_USE_MEMFD
#include <xbyak/xbyak.h>
#include <fstream>
class Code : Xbyak::MmapAllocator, public Xbyak::CodeGenerator {
public:
Code(const char *name, int v)
: Xbyak::MmapAllocator(name)
, Xbyak::CodeGenerator(4096, nullptr, this /* specify external MmapAllocator */)
{
mov(eax, v);
ret();
}
};
int main()
{
printf("pid=%d\n", getpid());
Code c1("Xbyak::abc", 123);
Code c2("Xbyak::xyz", 456);
printf("c1 %d\n", c1.getCode<int (*)()>()());
printf("c2 %d\n", c2.getCode<int (*)()>()());
std::ifstream ifs("/proc/self/maps", std::ios::binary);
if (ifs) {
std::string line;
while (std::getline(ifs, line)) {
printf("%s\n", line.c_str());
}
}
getchar();
}
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