From 85a426dc8678f04a78ffd799943b690ce2984c49 Mon Sep 17 00:00:00 2001
From: "U.Nakamura" <usa@ruby-lang.org>
Date: Mon, 27 Dec 2021 15:56:23 +0900
Subject: Tiny mmap emulation for Windows

- prerequisite of supporting YJIT with VC++.
- note that now can specfily `--yjit` on mswin64, but not enabled
  YJIT'ed code because of YJIT requires `OPT_DIRECT_THREADED_CODE`
  or `OPT_CALL_THREADED_CODE` in `rb_yjit_compile_iseq`.
---
 win32/win32.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'win32/win32.c')

diff --git a/win32/win32.c b/win32/win32.c
index c938e197a7..889046ceaa 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -8204,3 +8204,34 @@ VALUE (*const rb_f_notimplement_)(int, const VALUE *, VALUE, VALUE) = rb_f_notim
 #if RUBY_MSVCRT_VERSION < 120
 #include "missing/nextafter.c"
 #endif
+
+void *
+rb_w32_mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
+{
+    void *ptr;
+
+    if (fd > 0 || offset) {
+        /* not supported */
+        errno = EINVAL;
+        return MAP_FAILED;
+    }
+
+    ptr = VirtualAlloc(addr, len, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+    if (!ptr) {
+        errno = rb_w32_map_errno(GetLastError());
+        return MAP_FAILED;
+    }
+
+    return ptr;
+}
+
+int
+rb_w32_munmap(void *addr, size_t len)
+{
+    if (!VirtualFree(addr, 0, MEM_RELEASE)) {
+        errno = rb_w32_map_errno(GetLastError());
+        return -1;
+    }
+
+    return 0;
+}
-- 
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