Attempting to learn about a slow memory leak.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3887 ed5197a5-7fde-0310-b194-c3ffbd925b24

src/util.js.c

@@ -9,6 +9,83 @@
 
 #include <string.h>
 
+static int64_t s_uv_malloc_size;
+
+static void* _tf_uv_alloc(size_t size)
+{
+	void* ptr = malloc(size + sizeof(size_t));
+	if (ptr)
+	{
+		__atomic_add_fetch(&s_uv_malloc_size, size, __ATOMIC_RELAXED);
+		memcpy(ptr, &size, sizeof(size_t));
+		return (void*)((intptr_t)ptr + sizeof(size_t));
+	}
+	else
+	{
+		return NULL;
+	}
+}
+
+static void* _tf_uv_realloc(void* ptr, size_t size)
+{
+	void* old_ptr = ptr ? (void*)((intptr_t)ptr - sizeof(size_t)) : NULL;
+	size_t old_size = 0;
+	if (old_ptr)
+	{
+		memcpy(&old_size, old_ptr, sizeof(size_t));
+	}
+	void* new_ptr = realloc(old_ptr, size + sizeof(size_t));
+	if (new_ptr)
+	{
+		__atomic_add_fetch(&s_uv_malloc_size, (int64_t)size - (int64_t)old_size, __ATOMIC_RELAXED);
+		memcpy(new_ptr, &size, sizeof(size_t));
+		return (void*)((intptr_t)new_ptr + sizeof(size_t));
+	}
+	else
+	{
+		__atomic_sub_fetch(&s_uv_malloc_size, old_size, __ATOMIC_RELAXED);
+		return NULL;
+	}
+}
+
+static void* _tf_uv_calloc(size_t nmemb, size_t size)
+{
+	void* ptr = calloc(1, nmemb * size + sizeof(size_t));
+	if (ptr)
+	{
+		size_t total_size = nmemb * size;
+		__atomic_add_fetch(&s_uv_malloc_size, total_size, __ATOMIC_RELAXED);
+		memcpy(ptr, &total_size, sizeof(size_t));
+		return (void*)((intptr_t)ptr + sizeof(size_t));
+	}
+	else
+	{
+		return NULL;
+	}
+}
+
+static void _tf_uv_free(void* ptr)
+{
+	if (ptr)
+	{
+		void* old_ptr = (void*)((intptr_t)ptr - sizeof(size_t));
+		size_t size = 0;
+		memcpy(&size, old_ptr, sizeof(size_t));
+		__atomic_sub_fetch(&s_uv_malloc_size, size, __ATOMIC_RELAXED);
+		free(old_ptr);
+	}
+}
+
+void tf_util_replace_uv_allocator()
+{
+	uv_replace_allocator(_tf_uv_alloc, _tf_uv_realloc, _tf_uv_calloc, _tf_uv_free);
+}
+
+size_t tf_util_uv_get_malloc_size()
+{
+	return s_uv_malloc_size;
+}
+
 static JSValue _util_utf8_encode(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
 {
 	size_t length = 0;