commit 1e16b4d34eda09317d77ff29a0094eeb4fedb1f9
Author: Alexander Rosenberg <zanderpkg@pm.me>
Date:   Wed Sep 3 03:20:58 2025 -0700

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..737263f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/build*/
+/docs/
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..61f8958
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,40 @@
+cmake_minimum_required(VERSION 3.11)
+
+set(CMAKE_C_STANDARD 11)
+
+project(
+  object-lisp
+  VERSION 1.0
+  LANGUAGES C)
+
+include(FetchContent)
+FetchContent_Declare(
+  refcount
+  GIT_REPOSITORY https://git.zander.im/Zander671/refcount.git
+  GIT_TAG 4efdcc97ae3abbbfc3eb974a7880ff59522b379f)
+
+FetchContent_MakeAvailable(refcount)
+
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+  include(CTest)
+endif()
+
+add_compile_options(-fsanitize=address,leak,undefined)
+add_link_options(-fsanitize=address,leak,undefined)
+
+add_library(
+  olisp
+  src/object.c
+  src/number.c
+  src/array.c
+  src/string.c
+  src/symbol.c
+  src/function.c
+  src/hashtable.c)
+target_link_libraries(olisp PUBLIC refcount)
+target_include_directories(olisp PUBLIC include/)
+target_compile_options(olisp PRIVATE -Wall -Wpedantic)
+
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTING)
+  add_subdirectory(test/)
+endif()
diff --git a/include/lisp/array.h b/include/lisp/array.h
new file mode 100644
index 0000000..4811c5b
--- /dev/null
+++ b/include/lisp/array.h
@@ -0,0 +1,24 @@
+#ifndef INCLUDED_ARRAY_H
+#define INCLUDED_ARRAY_H
+
+#include "lisp/object.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(Array);
+
+struct Array {
+    Object base;
+    size_t length;
+    void *value;
+};
+struct ArrayClass {
+    Class base;
+    Object *(*length)(Object *self);
+    Object *(*elt)(Object *self, Object *index);
+    Object *(*aset)(Object *self, Object *index, Object *value);
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/function.h b/include/lisp/function.h
new file mode 100644
index 0000000..55a2a1b
--- /dev/null
+++ b/include/lisp/function.h
@@ -0,0 +1,24 @@
+#ifndef INCLUDED_FUNCTION_H
+#define INCLUDED_FUNCTION_H
+
+#include "lisp/hashtable.h"
+#include "lisp/object.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(Function);
+
+struct Function {
+    Object base;
+    Object *req_args;
+    Object *opt_args;
+    Object *kw_args;
+    Hashtable *arg_props;
+};
+struct FunctionClass {
+    Class base;
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/hashtable.h b/include/lisp/hashtable.h
new file mode 100644
index 0000000..17ca2ba
--- /dev/null
+++ b/include/lisp/hashtable.h
@@ -0,0 +1,20 @@
+#ifndef INCLUDED_HASHTABLE_H
+#define INCLUDED_HASHTABLE_H
+
+#include "lisp/object.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(Hashtable);
+
+struct Hashtable {
+    Object base;
+    HTTable *table;
+};
+struct HashtableClass {
+    Class base;
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/method_macro.h b/include/lisp/method_macro.h
new file mode 100644
index 0000000..ecb3257
--- /dev/null
+++ b/include/lisp/method_macro.h
@@ -0,0 +1,139 @@
+#ifndef INCLUDED_METHOD_MACRO_H
+#define INCLUDED_METHOD_MACRO_H
+
+#if __has_attribute(always_inline)
+#    define always_inline inline __attribute__((always_inline))
+#else
+#    define always_inline inline
+#endif
+
+#if __has_attribute(unused)
+#    define UNUSED __attribute__((unused))
+#else
+#    define UNUSED
+#endif
+
+// clang-format off
+#define _ELEVENTH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, ...) a11
+#define _COUNT_ARGS(...) _ELEVENTH(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+#define _GLUE(a, b) a##b
+#define _GLUE2(a, b) _GLUE(a, b)
+#define _IGNORE(...)
+#define _REMOVE_FIRST(a1, ...) __VA_ARGS__
+#define _EVAL(...) __VA_ARGS__
+// clang-format on
+
+// This is needed because C11 doesn't allow empty __VA_ARGS__
+#define _GET_1_1(a1)                     a1
+#define _GET_1_2(a1, a2)                 a1
+#define _GET_1_3(a1, a2, a3)             a1
+#define _GET_1_4(a1, a2, a3, a4)         a1
+#define _GET_1_5(a1, a2, a3, a4, a5)     a1
+#define _GET_1_6(a1, a2, a3, a4, a5, a6) a1
+
+#define _GET_2_2(a1, a2)                 a2
+#define _GET_2_3(a1, a2, a3)             a2
+#define _GET_2_4(a1, a2, a3, a4)         a2
+#define _GET_2_5(a1, a2, a3, a4, a5)     a2
+#define _GET_2_6(a1, a2, a3, a4, a5, a6) a2
+
+#define _GET_3_3(a1, a2, a3)             a3
+#define _GET_3_4(a1, a2, a3, a4)         a3
+#define _GET_3_5(a1, a2, a3, a4, a5)     a3
+#define _GET_3_6(a1, a2, a3, a4, a5, a6) a3
+
+#define _GET_4_4(a1, a2, a3, a4)         a4
+#define _GET_4_5(a1, a2, a3, a4, a5)     a4
+#define _GET_4_6(a1, a2, a3, a4, a5, a6) a4
+
+#define _GET_5_5(a1, a2, a3, a4, a5)     a5
+#define _GET_5_6(a1, a2, a3, a4, a5, a6) a5
+
+#define _GET_6_6(a1, a2, a3, a4, a5, a6) a6
+
+#define _GET_NTH(n, args) \
+    _EVAL(_GLUE2(_GLUE2(_GLUE2(_GET_, n), _), _COUNT_ARGS args) args)
+
+#define METHOD_CALLBACK_NAME(name) _##name##__as_callback
+
+#define _CB_DECL_ARGS_1        Object *
+#define _CB_DECL_ARGS_2        Object *, _CB_DECL_ARGS_1
+#define _CB_DECL_ARGS_3        Object *, _CB_DECL_ARGS_2
+#define _CB_DECL_ARGS_4        Object *, _CB_DECL_ARGS_3
+#define _CB_DECL_ARGS_5        Object *, _CB_DECL_ARGS_4
+#define _CB_DECL_ARGS_6        Object *, _CB_DECL_ARGS_5
+#define _CB_DECL_ARGS_N(count) (_GLUE(_CB_DECL_ARGS_, count))
+#define _CB_DECL_ARGS_FOR(...) _CB_DECL_ARGS_N(_COUNT_ARGS(__VA_ARGS__))
+#define _GEN_CB_DECL(name, args)       \
+    Object *METHOD_CALLBACK_NAME(name) \
+    _CB_DECL_ARGS_FOR args
+
+#define _ARG_NAME_1(args)    _IGNORE _GET_NTH(1, args)
+#define _ARG_NAME_2(args)    _IGNORE _GET_NTH(2, args)
+#define _ARG_NAME_3(args)    _IGNORE _GET_NTH(3, args)
+#define _ARG_NAME_4(args)    _IGNORE _GET_NTH(4, args)
+#define _ARG_NAME_5(args)    _IGNORE _GET_NTH(5, args)
+#define _ARG_NAME_6(args)    _IGNORE _GET_NTH(6, args)
+#define _ARG_NAME_N(n, args) _EVAL(_GLUE(_ARG_NAME_, n)(args))
+
+#define _VOID_ARG_N(n, args)  (void *) _ARG_NAME_N(n, args)
+#define _CALL_ARGS_1(args)    _VOID_ARG_N(1, args)
+#define _CALL_ARGS_2(args)    _CALL_ARGS_1(args), _VOID_ARG_N(2, args)
+#define _CALL_ARGS_3(args)    _CALL_ARGS_2(args), _VOID_ARG_N(3, args)
+#define _CALL_ARGS_4(args)    _CALL_ARGS_3(args), _VOID_ARG_N(4, args)
+#define _CALL_ARGS_5(args)    _CALL_ARGS_4(args), _VOID_ARG_N(5, args)
+#define _CALL_ARGS_6(args)    _CALL_ARGS_5(args), _VOID_ARG_N(6, args)
+#define _CALL_ARGS_N(n, args) _GLUE(_CALL_ARGS_, n)(args)
+#define _GEN_REAL_CALL(name, args) \
+    METHOD_CALLBACK_NAME(name)(_CALL_ARGS_N(_COUNT_ARGS args, args))
+
+#define _UNWRAP_TYPE(arg)       _EVAL arg
+#define _UNWRAP_ARG_N(n, args)  _UNWRAP_TYPE(_GET_NTH(n, args))
+#define _UNWRAP_ARGS_1(args)    _UNWRAP_ARG_N(1, args)
+#define _UNWRAP_ARGS_2(args)    _UNWRAP_ARGS_1(args), _UNWRAP_ARG_N(2, args)
+#define _UNWRAP_ARGS_3(args)    _UNWRAP_ARGS_2(args), _UNWRAP_ARG_N(3, args)
+#define _UNWRAP_ARGS_4(args)    _UNWRAP_ARGS_3(args), _UNWRAP_ARG_N(4, args)
+#define _UNWRAP_ARGS_5(args)    _UNWRAP_ARGS_4(args), _UNWRAP_ARG_N(5, args)
+#define _UNWRAP_ARGS_6(args)    _UNWRAP_ARGS_5(args), _UNWRAP_ARG_N(6, args)
+#define _UNWRAP_ARGS_N(n, args) _GLUE(_UNWRAP_ARGS_, n)(args)
+#define _UNWRAP_ARGS(args)      _UNWRAP_ARGS_N(_COUNT_ARGS args, args)
+
+#define _METHOD_RAW(rtype, ret_stmt, name, args)          \
+    _GEN_CB_DECL(name, args);                             \
+    static always_inline rtype name(_UNWRAP_ARGS(args)) { \
+        ret_stmt _GEN_REAL_CALL(name, args);              \
+    }                                                     \
+    struct __dummy_struct
+
+#define METHOD(rtype, name, args) _METHOD_RAW(rtype, return (rtype), name, args)
+#define VOID_METHOD(name, args)   _METHOD_RAW(void, , name, args)
+
+#define _CB_DEF_ARGS_1        Object *_internal_arg1
+#define _CB_DEF_ARGS_2        _CB_DEF_ARGS_1, Object *_internal_arg2
+#define _CB_DEF_ARGS_3        _CB_DEF_ARGS_2, Object *_internal_arg3
+#define _CB_DEF_ARGS_4        _CB_DEF_ARGS_3, Object *_internal_arg4
+#define _CB_DEF_ARGS_5        _CB_DEF_ARGS_4, Object *_internal_arg5
+#define _CB_DEF_ARGS_6        _CB_DEF_ARGS_5, Object *_internal_arg6
+#define _CB_DEF_ARGS_N(count) (_GLUE(_CB_DEF_ARGS_, count))
+#define _CB_DEF_ARGS_FOR(...) _CB_DEF_ARGS_N(_COUNT_ARGS(__VA_ARGS__))
+#define _GEN_CB_DEF(name, args)        \
+    Object *METHOD_CALLBACK_NAME(name) \
+    _CB_DEF_ARGS_FOR args
+
+#define _SET_NTH_ARG(n, args) \
+    UNUSED _GET_NTH(n, args) = (void *) _internal_arg##n;
+#define _SET_ARGS_1(args)    _SET_NTH_ARG(1, args)
+#define _SET_ARGS_2(args)    _SET_ARGS_1(args) _SET_NTH_ARG(2, args)
+#define _SET_ARGS_3(args)    _SET_ARGS_2(args) _SET_NTH_ARG(3, args)
+#define _SET_ARGS_4(args)    _SET_ARGS_3(args) _SET_NTH_ARG(4, args)
+#define _SET_ARGS_5(args)    _SET_ARGS_4(args) _SET_NTH_ARG(5, args)
+#define _SET_ARGS_6(args)    _SET_ARGS_5(args) _SET_NTH_ARG(6, args)
+#define _SET_ARGS_N(n, args) _GLUE(_SET_ARGS_, n)(args)
+
+#define DEFINE_METHOD(rtype, name, args, body) \
+    _GEN_CB_DEF(name, args) {                  \
+        _SET_ARGS_N(_COUNT_ARGS args, args)    \
+        body                                   \
+    }
+
+#endif
diff --git a/include/lisp/number.h b/include/lisp/number.h
new file mode 100644
index 0000000..c2a76df
--- /dev/null
+++ b/include/lisp/number.h
@@ -0,0 +1,42 @@
+#ifndef INCLUDED_NUMBER_H
+#define INCLUDED_NUMBER_H
+
+#include "lisp/object.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(Number);
+DECLARE_CLASS(Float);
+DECLARE_CLASS(Integer);
+
+struct Number {
+    Object base;
+};
+struct NumberClass {
+    Class base;
+
+    Object *(*add)(Object *self, Object *other);
+    Object *(*sub)(Object *self, Object *other);
+};
+
+struct Float {
+    Number base;
+
+    double value;
+};
+struct FloatClass {
+    NumberClass base;
+};
+
+struct Integer {
+    Number base;
+
+    int64_t value;
+};
+struct IntegerClass {
+    NumberClass base;
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/object.h b/include/lisp/object.h
new file mode 100644
index 0000000..af6d31d
--- /dev/null
+++ b/include/lisp/object.h
@@ -0,0 +1,73 @@
+#ifndef INCLUDED_OBJECT_H
+#define INCLUDED_OBJECT_H
+
+#include "lisp/method_macro.h"
+#include "lisp/util.h"
+
+#include <ht.h>
+#include <refcount/refcount.h>
+#include <stddef.h>
+
+LISP_BEGIN_DECLS
+
+#define DECLARE_CLASS(Name)   \
+    typedef struct Name Name; \
+    typedef struct Name##Class Name##Class
+
+// clang-format off
+#define ELEVENTH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, ...) a11
+#define COUNT_ARGS(...) ELLEVENTH(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
+// clang-format on
+
+#undef COUNT_ARGS
+#undef TENTH
+
+typedef struct Object Object;
+typedef struct Class Class;
+
+struct Object {
+    RefcountEntry refcount;
+    Class *class;
+
+    Object **slots;
+};
+
+struct Class {
+    Object base;
+    Class *superclass;
+    HTTable *subclasses;
+    size_t object_size;
+
+    HTTable *slots_indicies;
+    uint64_t nslots;
+    HTTable *methods;
+
+    Object *(*construct)(Object *self, Object *args);
+};
+
+Object *make_object(Object *class, Object *args);
+
+DECLARE_CLASS(Pair);
+
+struct Pair {
+    Object base;
+
+    Object *head;
+    Object *tail;
+};
+struct PairClass {
+    Class base;
+
+    Object *(*head)(Object *self);
+    Object *(*sethead)(Object *self, Object *new_head);
+    Object *(*tail)(Object *self);
+    Object *(*settail)(Object *self, Object *new_tail);
+};
+
+METHOD(Object *, head, ((Pair *) self));
+VOID_METHOD(sethead, ((Pair *) self));
+METHOD(Object *, tail, ((Pair *) self));
+VOID_METHOD(settail, ((Pair *) self));
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/string.h b/include/lisp/string.h
new file mode 100644
index 0000000..df53ef8
--- /dev/null
+++ b/include/lisp/string.h
@@ -0,0 +1,20 @@
+#ifndef INCLUDED_STRING_H
+#define INCLUDED_STRING_H
+
+#include "lisp/array.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(String);
+
+struct String {
+    Array base;
+    bool borrowed;
+};
+struct StringClass {
+    ArrayClass base;
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/symbol.h b/include/lisp/symbol.h
new file mode 100644
index 0000000..fdd7998
--- /dev/null
+++ b/include/lisp/symbol.h
@@ -0,0 +1,32 @@
+#ifndef INCLUDED_SYMBOL_H
+#define INCLUDED_SYMBOL_H
+
+#include "lisp/function.h"
+#include "lisp/object.h"
+#include "lisp/string.h"
+#include "lisp/util.h"
+
+LISP_BEGIN_DECLS
+
+DECLARE_CLASS(Symbol);
+
+struct Symbol {
+    Object base;
+    String *name;
+
+    Object *value;
+    Class *class;
+    Function *func;
+    Object *plist;
+};
+struct SymbolClass {
+    Class base;
+
+    Object *(*value)(Object *self);
+    Object *(*class)(Object *self);
+    Object *(*function)(Object *self);
+    Object *(*plist)(Object *self);
+};
+
+LISP_END_DECLS
+#endif
diff --git a/include/lisp/util.h b/include/lisp/util.h
new file mode 100644
index 0000000..8db07da
--- /dev/null
+++ b/include/lisp/util.h
@@ -0,0 +1,12 @@
+#ifndef INCLUDED_UTIL_H
+#define INCLUDED_UTIL_H
+
+#ifdef __cplusplus
+#    define LISP_BEGIN_DECLS extern "C" {
+#    define LISP_END_DECLS   }
+#else
+#    define LISP_BEGIN_DECLS
+#    define LISP_END_DECLS
+#endif
+
+#endif
diff --git a/src/array.c b/src/array.c
new file mode 100644
index 0000000..35d37a8
--- /dev/null
+++ b/src/array.c
@@ -0,0 +1 @@
+#include "lisp/array.h"
diff --git a/src/function.c b/src/function.c
new file mode 100644
index 0000000..5ec973b
--- /dev/null
+++ b/src/function.c
@@ -0,0 +1 @@
+#include "lisp/function.h"
diff --git a/src/hashtable.c b/src/hashtable.c
new file mode 100644
index 0000000..4222637
--- /dev/null
+++ b/src/hashtable.c
@@ -0,0 +1 @@
+#include "lisp/hashtable.h"
diff --git a/src/number.c b/src/number.c
new file mode 100644
index 0000000..31968d6
--- /dev/null
+++ b/src/number.c
@@ -0,0 +1 @@
+#include "lisp/number.h"
diff --git a/src/object.c b/src/object.c
new file mode 100644
index 0000000..aab5678
--- /dev/null
+++ b/src/object.c
@@ -0,0 +1,11 @@
+#include "lisp/object.h"
+
+#include "lisp/symbol.h"
+
+Object *make_object(Object *class, Object *args) {
+    return NULL;
+}
+
+DEFINE_METHOD(Object *, head, (Pair * self), {
+    return NULL; //
+})
diff --git a/src/string.c b/src/string.c
new file mode 100644
index 0000000..0a6b783
--- /dev/null
+++ b/src/string.c
@@ -0,0 +1 @@
+#include "lisp/string.h"
diff --git a/src/symbol.c b/src/symbol.c
new file mode 100644
index 0000000..8bd6550
--- /dev/null
+++ b/src/symbol.c
@@ -0,0 +1 @@
+#include "lisp/symbol.h"
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..c628823
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_compile_options(-Wall -Wpedantic)
+link_libraries(olisp)
+
+add_executable(test_object test_object.c)
+add_test(NAME object COMMAND test_object)
diff --git a/test/test_object.c b/test/test_object.c
new file mode 100644
index 0000000..9b38cae
--- /dev/null
+++ b/test/test_object.c
@@ -0,0 +1,5 @@
+#include <lisp/object.h>
+
+int main(int argc, const char **argv) {
+    return 0;
+}