a skeletal module for higher-order pattern unification in the C runtime

src/runtime/c/Makefile.am

@@ -76,10 +76,11 @@ libpgf_la_SOURCES = \
 	pgf/typechecker.c \
 	pgf/reasoner.c \
 	pgf/evaluator.c \
+	pgf/hopu.c \
 	pgf/printer.c \
 	pgf/graphviz.c \
 	pgf/pgf.c \
-	pgf/pgf.h
+	pgf/pgf.h \
 libpgf_la_LDFLAGS = "-no-undefined"
 libpgf_la_LIBADD = libgu.la
 

src/runtime/c/pgf/hopu.c

@@ -0,0 +1,10 @@
+#include "data.h"
+#include "evaluator.h"
+#include "hopu.h"
+
+void pgf_pattern_unify(PgfEvalState* state, PgfClosure* c1, PgfClosure* c2)
+{
+	c1 = state->eval_gates->enter(state, c1);
+	c2 = state->eval_gates->enter(state, c2);
+}
+

src/runtime/c/pgf/hopu.h

@@ -0,0 +1,7 @@
+#ifndef HOPU_H
+#define HOPU_H
+
+void pgf_pattern_unify(PgfEvalState* state, PgfClosure* c1, PgfClosure* c2);
+
+#endif
+