WIP top-level parsing and keyword tokens

ast.c

@@ -0,0 +1,83 @@
+typedef enum {
+    TYPE_NONE,
+    TYPE_VOID,
+    TYPE_BOOL,
+
+    TYPE_CHAR,
+    TYPE_SCHAR,
+    TYPE_UCHAR,
+    TYPE_SHORT,
+    TYPE_USHORT,
+    TYPE_INT,
+    TYPE_UINT,
+    TYPE_LONG,
+    TYPE_ULONG,
+    TYPE_LLONG,
+    TYPE_ULLONG,
+
+    TYPE_FLOAT,
+    TYPE_DOUBLE,
+    TYPE_LDOUBLE,
+
+    TYPE_POINTER,
+    TYPE_ARRAY,
+    TYPE_FUNCTION,
+
+    TYPE_STRUCT,
+    TYPE_UNION,
+    TYPE_ENUM,
+} Type_Kind;
+
+typedef struct Type Type;
+struct Type {
+    Type_Kind kind;
+    int size;
+    int align;
+    Type *base;
+};
+
+typedef enum Ast_Kind {
+    AST_NONE,
+    AST_ERROR,
+    AST_INT,
+    AST_UNARY,
+    AST_BINARY,
+
+    AST_FUNCTION,
+    AST_BLOCK,
+
+} Ast_Kind;
+
+typedef struct Ast Ast;
+struct Ast {
+    Ast_Kind kind;
+    Token *pos;
+
+    union {
+        uint64_t u;
+        struct {
+            Token_Kind op;
+            Ast *l;
+            Ast *r;
+        };
+        char *error;
+    };
+};
+
+Ast *create_ast(Token *token, Ast_Kind kind) {
+    Ast *result = calloc(1, sizeof(Ast));
+    result->pos = token;
+    result->kind = kind;
+    return result;
+}
+
+Ast *create_binary_expr(Token *token, Token_Kind op, Ast *left, Ast *right) {
+    Ast *result = create_ast(token, AST_BINARY);
+    result->op = op;
+    result->l = left;
+    result->r = right;
+    return result;
+}
+
+Type base_type_int = {TYPE_INT, .size = sizeof(int), .align = __alignof(int)};
+Type *type_int = &base_type_int;