From a0a889ede9c85b8d7b6155a0ce19bcee45c4c654 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Tue, 29 Dec 2015 14:46:45 -0800
Subject: [PATCH] Attach FFI closure deallocation to Functor's pool.

---
 Execute.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Execute.cpp b/Execute.cpp
index ced61fc..7875d88 100644
--- a/Execute.cpp
+++ b/Execute.cpp
@@ -901,9 +901,18 @@ static JSValueRef FunctionAdapter_(JSContextRef context, size_t count, JSValueRe
     return CYCallAsFunction(context, function, NULL, count, values);
 }
 
+#if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
+static void CYFreeFunctor(void *data) {
+    ffi_closure_free(data);
+}
+#else
+static void CYFreeFunctor(void *data) {
+    _syscall(munmap(data, sizeof(ffi_closure)));
+}
+#endif
+
 Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function, const sig::Signature &signature, JSValueRef (*adapter)(JSContextRef, size_t, JSValueRef[], JSObjectRef)) {
     // XXX: in case of exceptions this will leak
-    // XXX: in point of fact, this may /need/ to leak :(
     Closure_privateData *internal(new Closure_privateData(context, function, adapter, signature));
 
 #if defined(__APPLE__) && (defined(__arm__) || defined(__arm64__))
@@ -913,6 +922,7 @@ Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function,
     ffi_status status(ffi_prep_closure_loc(writable, &internal->cif_, &CYExecuteClosure, internal, executable));
     _assert(status == FFI_OK);
 
+    internal->pool_->atexit(&CYFreeFunctor, writable);
     internal->value_ = executable;
 #else
     ffi_closure *closure((ffi_closure *) _syscall(mmap(
@@ -926,6 +936,7 @@ Closure_privateData *CYMakeFunctor_(JSContextRef context, JSObjectRef function,
 
     _syscall(mprotect(closure, sizeof(*closure), PROT_READ | PROT_EXEC));
 
+    internal->pool_->atexit(&CYFreeFunctor, closure);
     internal->value_ = closure;
 #endif
 
-- 
2.49.0