start working on text representation and constants

src/function.h

@@ -4,7 +4,10 @@
 #include "type.h"
 #include "block.h"
 #include "list.h"
-#include <assert.h>
+#include "strb.h"
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
 
 UseList(GravityBlock);
 
@@ -13,6 +16,10 @@ typedef struct GravityOpaqueFunction* GravityFunction;
 struct GravityOpaqueFunction {
     GravityFunctionType functionType;
     List(GravityBlock) blocks;
+    const char* name;
 };
 
+GravityBlock gravityStartBlock(const char* name, GravityFunction function, uint16_t numBlockParams, ...);
+char* gravityFunctionToCStr(GravityFunction function);
+
 #endif