1 files changed, 11 insertions, 2 deletions
diff --git a/ir.h b/ir.h
index 251c198..ff75163 100644
--- a/ir.h
+++ b/ir.h
@@ -12,6 +12,7 @@ typedef enum {
 	T_TOP, /* may or may not be a constant */
 	T_CONST, /* known compile-time constant */
 	T_BOT, /* known not a constant */
+	T_CTRL /* bottom of control flow */
 } TypeLevel;
 
 typedef enum {
@@ -48,7 +49,7 @@ void type_err(struct Node *n, Lexer *l);
 
 typedef enum {
 	N_NONE,
-	N_START,
+	N_START, N_IF_ELSE, N_REGION, N_PHI, N_STOP,
 	N_PROJ,
 	N_RETURN,
 	N_KEEPALIVE,
@@ -101,9 +102,16 @@ typedef struct {
 } Scope;
 
 typedef struct {
+	Str name;
+	Node *node;
+} ScopeName;
+
+typedef DYNARR(ScopeName) ScopeNameList;
+
+typedef struct {
 	Arena arena;
 	Str name;
-	Node *start, *stop, *keepalive;
+	Node *start, *stop, *ctrl, *keepalive;
 	Node *free_list;
 	Scope scope;
 } Proc;
@@ -144,5 +152,6 @@ ScopeFrame *scope_pop(Scope *scope, Proc *proc);
 NameBinding *scope_find(Scope *scope, Str name);
 NameBinding *scope_bind(Scope *scope, Str name, Node *value, LexSpan pos, Proc *proc);
 NameBinding *scope_update(Scope *scope, Str name, Node *to, Proc *proc);
+void scope_collect(Scope *scope, Proc *proc, ScopeNameList *nl, Arena *arena);
 
 #endif