1 files changed, 97 insertions, 0 deletions
diff --git a/src/stdlib/functiontype.c b/src/stdlib/functiontype.c
new file mode 100644
index 00000000..b02739a2
--- /dev/null
+++ b/src/stdlib/functiontype.c
@@ -0,0 +1,97 @@
+// Logic for handling function type values
+
+#include <stdbool.h>
+
+#include "datatypes.h"
+#include "functiontype.h"
+#include "optionals.h"
+#include "structs.h"
+#include "tables.h"
+#include "text.h"
+#include "types.h"
+#include "util.h"
+
+typedef struct {
+    Text_t filename, name;
+    int64_t line_num;
+} func_info_t;
+
+static NamedType_t fields[] = {
+    {.name="filename", .type=&Text$info},
+    {.name="name", .type=&Text$info},
+    {.name="line_num", .type=&Int64$info},
+};
+
+static const TypeInfo_t func_info_type = {.size=sizeof(func_info_t), .align=__alignof__(func_info_t), .metamethods=Struct$metamethods,
+                                  .tag=StructInfo, .StructInfo.name="FuncInfo",
+                                  .StructInfo.num_fields=3, .StructInfo.fields=fields};
+static Table_t function_info = {};
+
+public void register_function(void *fn, Text_t filename, int64_t line_num, Text_t name)
+{
+    func_info_t info = {
+        .filename=filename,
+        .line_num=line_num,
+        .name=name,
+    };
+    Table$set(&function_info, &fn, &info, Table$info(Function$info("???"), &func_info_type));
+}
+
+PUREFUNC static func_info_t *get_function_info(void *fn)
+{
+    func_info_t *info = Table$get(function_info, &fn, Table$info(Function$info("???"), &func_info_type));
+    if (info) return info;
+
+    void *closest_fn = NULL;
+    for (int64_t i = 0; i < function_info.entries.length; i++) {
+        struct { void *fn; func_info_t info; } *entry = function_info.entries.data + i*function_info.entries.stride;
+        if (entry->fn > fn || entry->fn < closest_fn) continue;
+        closest_fn = entry->fn;
+        info = &entry->info;
+    }
+    return info;
+}
+
+PUREFUNC public OptionalText_t get_function_name(void *fn)
+{
+    func_info_t *info = get_function_info(fn);
+    return info ? info->name : NONE_TEXT;
+}
+
+PUREFUNC public OptionalText_t get_function_filename(void *fn)
+{
+    func_info_t *info = get_function_info(fn);
+    return info ? info->filename : NONE_TEXT;
+}
+
+PUREFUNC public int64_t get_function_line_num(void *fn)
+{
+    func_info_t *info = get_function_info(fn);
+    return info ? info->line_num : -1;
+}
+
+public Text_t Func$as_text(const void *fn, bool colorize, const TypeInfo_t *type)
+{
+    (void)fn;
+    Text_t text = Text$from_str(type->FunctionInfo.type_str);
+    if (fn) {
+        OptionalText_t name = get_function_name(*(void**)fn);
+        if (name.length >= 0)
+            text = name;
+
+        OptionalText_t filename = get_function_filename(*(void**)fn);
+        int64_t line_num = get_function_line_num(*(void**)fn);
+        if (filename.length >= 0)
+            text = Text$format("%k [%k:%ld]", &text, &filename, line_num);
+    }
+    if (fn && colorize)
+        text = Text$concat(Text("\x1b[32;1m"), text, Text("\x1b[m"));
+    return text;
+}
+
+public PUREFUNC bool Func$is_none(const void *obj, const TypeInfo_t*)
+{
+    return *(void**)obj == NULL;
+}
+
+// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0