Add windows cache flush

Cargo.toml

@@ -22,7 +22,7 @@ libc = { version = "0.2", default-features = false }
 mach2 = "0.4"
 
 [target.'cfg(target_os = "windows")'.dependencies]
-windows = { version = "0.58", features = ["Win32_System_SystemInformation", "Win32_System_Memory"] }
+windows = { version = "0.58", features = ["Win32_System_SystemInformation", "Win32_System_Memory", "Win32_System_Threading", "Win32_System_Diagnostics_Debug"] }
 
 [dev-dependencies]
 trybuild = "1"

src/os/windows.rs

@@ -1,8 +1,10 @@
 //! Windows-specific implementations
 
 use windows::Win32::System::{
+    Diagnostics::Debug::FlushInstructionCache,
     Memory::{VirtualProtect, PAGE_EXECUTE_READWRITE, PAGE_PROTECTION_FLAGS},
     SystemInformation::{GetSystemInfo, SYSTEM_INFO},
+    Threading::GetCurrentProcess,
 };
 
 use crate::{code_manipulate::CodeManipulator, JumpEntry};
@@ -69,5 +71,9 @@ impl CodeManipulator for ArchCodeManipulator {
         if res.is_err() {
             panic!("Unable to restore code region to non-writable");
         }
+        let res = unsafe { FlushInstructionCache(GetCurrentProcess(), Some(addr), L) };
+        if res.is_err() {
+            panic!("Failed to flush instruction cache");
+        }
     }
 }