prevent type duplication

2 files changed, 26 insertions, 5 deletions

diff --git a/inc/util/slice.h b/inc/util/slice.h
index ce1d3e4..0e018a6 100644
--- a/inc/util/slice.h
+++ b/inc/util/slice.h
@@ -7,7 +7,8 @@
 } Slice##N; \
 Slice##N Slice##N##_from_ptr(T* ptr, i32 len); \
 Slice##N Slice##N##_sub(Slice##N s, i32 pos, i32 len); \
-Slice##N Slice##N##_next(Slice##N s);
+Slice##N Slice##N##_next(Slice##N s); \
+int Slice##N##_cmp(Slice##N s1, Slice##N s2);
 
 #define slice_impl(N, T) \
 Slice##N \
@@ -30,6 +31,15 @@ Slice##N \
 Slice##N##_next(Slice##N s) \
 { \
 	return Slice##N##_sub(s, 1, -1); \
+} \
+int \
+Slice##N##_cmp(Slice##N s1, Slice##N s2) \
+{ \
+	if (s1.len < s2.len) \
+		return -1; \
+	if (s1.len > s2.len) \
+		return 1; \
+	return memcmp(s1.loc, s2.loc, s1.len * sizeof(s1.loc[0])); \
 }
 
 slice_decl(U8, u8);
diff --git a/src/main.c b/src/main.c
index b7e7760..dd6c1f8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,18 +37,29 @@ main([[maybe_unused]] int argc, [[maybe_unused]] char **argv)
 	auto types = VecType_new(0);
 	type_add_primaries(types);
 	for (auto node = nodes; node; node = node->next) {
+		bool is_type = true;
+		Type type;
 		switch (node->type) {
 		case NOD_ALIAS:
-			VecType_push(types, type_new_alias(node));
+			type = type_new_alias(node);
 			break;
 		case NOD_STRUCT:
-			VecType_push(types, type_new_struct(node));
+			type = type_new_struct(node);
 			break;
 		case NOD_UNION:
-			VecType_push(types, type_new_union(node));
+			type = type_new_union(node);
+			break;
+		default:
+			is_type = false;
 			break;
-		default: break;
 		}
+		if (!is_type)
+			continue;
+		for (size_t i = 0; i < types->size; i++)
+			if (SliceU8_cmp(type.name, types->p[i].name) == 0)
+				panic("duplicate declaration of type '%.*s'",
+				      type.name.len, type.name.loc);
+		VecType_push(types, type);
 	}
 	vec_log(types, "%.*s", X->name.len, X->name.loc);