Data commit

Task/Machine-code/Nim/machine-code.nim

@@ -0,0 +1,22 @@
+import posix
+
+let MAP_ANONYMOUS {.importc: "MAP_ANONYMOUS", header: "<sys/mman.h>".}: cint
+
+proc test(a, b: cint): cint =
+  # mov EAX, [ESP+4]
+  # add EAX, [ESP+8]
+  # ret
+  var code = [0x8B'u8, 0x44, 0x24, 0x4, 0x3, 0x44, 0x24, 0x8, 0xC3]
+
+  # create an executable buffer
+  var buf = mmap(nil, sizeof(code), PROT_READ or PROT_WRITE or PROT_EXEC,
+    MAP_PRIVATE or MAP_ANONYMOUS, -1, 0)
+
+  # copy code to the buffer
+  copyMem(buf, addr code[0], sizeof(code))
+  # run code
+  result = cast[proc(a, b: cint): cint {.nimcall.}](buf)(a, b)
+  # free buffer
+  discard munmap(buf, sizeof(code))
+
+echo test(7, 12)