add memfd sample

1 files changed, 31 insertions, 0 deletions

diff --git a/sample/memfd.cpp b/sample/memfd.cpp
new file mode 100644
index 0000000..c29272b
--- /dev/null
+++ b/sample/memfd.cpp
@@ -0,0 +1,31 @@
+/*
+	cat /proc/`psidof ./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>
+
+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()
+{
+    Code c1("abc", 123);
+    Code c2("xyz", 456);
+    printf("c1 %d\n", c1.getCode<int (*)()>()());
+    printf("c2 %d\n", c2.getCode<int (*)()>()());
+    getchar();
+}