Starting to add intermediate representation (IR)

Right now none of this is hooked up, but I want to get things checked in incrementally rather than have along long-lived branches.

- Added placeholder declarations for IR representation of instructions, basic blocks, etc.

- Start adding a `lower-to-ir` pass to translate from AST representation to IR

Again: none of this is functional, so it shouldn't mess with existing users of the compiler.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/slang/visitor.h b/source/slang/visitor.h
index 59c5772f2..8a0301782 100644
--- a/source/slang/visitor.h
+++ b/source/slang/visitor.h
@@ -34,6 +34,13 @@ struct TypeVisitor : Base
         return result;
     }
 
+    Result dispatchType(Type* type)
+    {
+        Result result;
+        type->accept(this, &result);
+        return result;
+    }
+
 #define ABSTRACT_SYNTAX_CLASS(NAME,BASE) /* empty */
 #define SYNTAX_CLASS(NAME, BASE) \
     virtual void dispatch_##NAME(NAME* obj, void* extra) override \
@@ -61,6 +68,11 @@ struct TypeVisitor<Derived,void,Base> : Base
         type->accept(this, 0);
     }
 
+    void dispatchType(Type* type)
+    {
+        type->accept(this, 0);
+    }
+
 #define ABSTRACT_SYNTAX_CLASS(NAME,BASE) /* empty */
 #define SYNTAX_CLASS(NAME, BASE) \
     virtual void dispatch_##NAME(NAME* obj, void*) override \