windows.patch

--- a/jit.c
+++ b/jit.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
-#include <sys/mman.h>
+#include <windows.h>

 #define PAGE_SIZE 4096

@@ -15,21 +15,20 @@ struct asmbuf {
 struct asmbuf *
 asmbuf_create(void)
 {
-    int prot = PROT_READ | PROT_WRITE;
-    int flags = MAP_ANONYMOUS | MAP_PRIVATE;
-    return mmap(NULL, PAGE_SIZE, prot, flags, -1, 0);
+    return VirtualAlloc(NULL, PAGE_SIZE, MEM_COMMIT, PAGE_READWRITE);
 }

 void
 asmbuf_free(struct asmbuf *buf)
 {
-    munmap(buf, PAGE_SIZE);
+    VirtualFree(buf, PAGE_SIZE, MEM_RELEASE);
 }

 void
 asmbuf_finalize(struct asmbuf *buf)
 {
-    mprotect(buf, PAGE_SIZE, PROT_READ | PROT_EXEC);
+    DWORD old;
+    VirtualProtect(buf, PAGE_SIZE, PAGE_EXECUTE_READ, &old);
 }

 void
@@ -50,7 +49,7 @@ int main(void)
 {
     /* Compile input program */
     struct asmbuf *buf = asmbuf_create();
-    asmbuf_ins(buf, 3, 0x4889f8); // mov %rdi, %rax
+    asmbuf_ins(buf, 3, 0x4889c8); // mov %rcx, %rax
     int c;
     while ((c = fgetc(stdin)) != '\n' && c != EOF) {
         if (c == ' ')