initial import of the C runtime

src/runtime/c/gu/hash.h

@@ -0,0 +1,40 @@
+#ifndef GU_HASH_H_
+#define GU_HASH_H_
+
+#include <gu/fun.h>
+
+typedef GuWord GuHash;
+
+static inline GuHash
+gu_hash_ptr(void* ptr)
+{
+	return (GuHash) ptr;
+}
+
+
+static inline GuHash
+gu_hash_byte(GuHash h, uint8_t u)
+{
+	// Paul Larson's simple byte hash
+	return h * 101 + u;
+}
+
+
+GuHash
+gu_hash_bytes(GuHash h, const uint8_t* buf, size_t len);
+
+typedef const struct GuHasher GuHasher;
+
+struct GuHasher {
+	GuEquality eq;
+	GuHash (*hash)(GuHasher* self, const void* p);
+};
+
+
+extern GuHasher gu_int_hasher[1];
+
+extern GuHasher gu_addr_hasher[1];
+
+extern GuHasher gu_word_hasher[1];
+
+#endif // GU_HASH_H_