added frame userdata key

include/frame.h

@@ -3,11 +3,15 @@
 #include "box.h"
 
 #include <cstdint>
-#define _SM_STACK_SIZE 256
+#define _SM_STACK_SIZE 15
+
+#define _SM_KEY_SIZE (UINT64_MAX >> 2)
 
 struct _sm_user {
-	bool set ;//: 1; No need for these to be bitfield packed, there's an alignment hole here anyway.
+	uint64_t set : 1;
-	bool free ;//: 1;
+	uint64_t free : 1;
+
+	uint64_t key : 62;
 
 	union {
 		uint8_t _8;

include/state.h

@@ -4,23 +4,51 @@
 
 typedef void* (*sm_yield)(sm_state* state); //NOTE: This `void*` is a stand-in for this function returning itself.
 
+inline uint64_t _sm_confine_key(uint64_t ui)
+{
+	return ui & _SM_KEY_SIZE;
+}
+
+inline uint64_t _sm_compute_key(uint64_t name)
+{
+	return _sm_confine_key(name);
+}
+
 template<typename T, typename U>
-inline T* _sm_var(sm_state* state, U name, T init)
+inline T* _sm_var(_sm_user_page* user, U name, T init)
 {
-	auto val = &state->current->user.data[name];
+	auto skey = name % _SM_STACK_SIZE;
-	bool set = val->set;
 
-	val->set = true;
+	auto val = &user->data[skey];
-	
 
-	return ( ! set ) ?
+	auto key = _sm_compute_key( (uint64_t)name );
-		(val->free = false, _sm_init<T>(val, init)) :
+
-		_sm_get<T>(val);
+	bool set = val->set;
+
+	if(!set) {
+		val->set = true;
+		val->free = false;
+		val->key = key;
+		return _sm_init<T>(val, init);
+	}
+	else if(key == val->key) {
+		//TODO: Check equality of value somehow
+		return _sm_get<T>(val);
+	} else {
+		// Move to next page
+		if(!user->next) user->next = box<_sm_user_page, true>();
+		return _sm_var<T, U>(user->next, name, init);
+	}
+}
+template<typename T, typename U>
+inline T* _sm_var(sm_state* state, U name, T init)
+{
+	return _sm_var<T,U>(&state->current->user, name, init);
 }
 template<uint64_t name, typename T>
 inline T* _sm_var(sm_state* state, T init)
 {
-	static_assert(name < _SM_STACK_SIZE, "Line pseudo-hashmap not yet implemented");
+	//static_assert(name < _SM_STACK_SIZE, "Line pseudo-hashmap not yet implemented");
 	return _sm_var(state, name, init);
 }