From de0e88f2e91414c6b06d44a92d93a027b057fa69 Mon Sep 17 00:00:00 2001
From: samsonium <me@samsonium.ru>
Date: Thu, 5 Nov 2026 04:01:23 +0300
Subject: [PATCH] wip: begin writer impl for externs

---
 src/compiler/fzl_writer.c             |  5 +++++
 src/compiler/generator/gen_externfn.c |  9 ++++-----
 src/compiler/generator/gen_struct.c   | 11 +----------
 3 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/src/compiler/fzl_writer.c b/src/compiler/fzl_writer.c
index 5c0a4af..527c90d 100644
--- a/src/compiler/fzl_writer.c
+++ b/src/compiler/fzl_writer.c
@@ -39,6 +39,9 @@ int fzl_write(fzl_writer_t *writer, fzl_gen_t *gen)
   const char hdr[5] = {'F', 'Z', 'L', 0x0, 0x1};
   fwrite(hdr, sizeof(char), 5, fp);
   fwrite(&gen->consts->size, sizeof(size_t), 1, fp);
+  fwrite(&gen->extern_libs_count, sizeof(size_t), 1, fp);
+  fwrite(&gen->extern_types_count, sizeof(size_t), 1, fp);
+  fwrite(&gen->extern_fns_count, sizeof(size_t), 1, fp);
   fwrite(&gen->ops_count, sizeof(size_t), 1, fp);
 
   for (size_t i = 0; i < gen->consts->size; i++)
@@ -54,6 +57,8 @@ int fzl_write(fzl_writer_t *writer, fzl_gen_t *gen)
     }
   }
 
+  // TODO: write libs, types and functions
+
   if (gen->ops_count > 0)
     fwrite(gen->ops, sizeof(uint64_t), gen->ops_count, fp);
 
diff --git a/src/compiler/generator/gen_externfn.c b/src/compiler/generator/gen_externfn.c
index 97f1e8b..3890793 100644
--- a/src/compiler/generator/gen_externfn.c
+++ b/src/compiler/generator/gen_externfn.c
@@ -32,9 +32,6 @@ gen_res_t gen_externfn(fzl_gen_t *gen, fzl_node_t *node)
   for (size_t i = 0; i < node->ext_fn.args_count; i++)
   {
     fzl_node_t *argnode = node->ext_fn.args[i];
-    if (gen_common(gen, argnode).error)
-      return gen_error;
-
     if (args_count >= args_remainder)
     {
       args_remainder *= 2;
@@ -105,7 +102,8 @@ gen_res_t gen_externfn(fzl_gen_t *gen, fzl_node_t *node)
     return gen_error;
   }
 
-  if (ret != FZL_TYPE_NULL)
+  if (ret == FZL_TYPE_OBJECT || ret == FZL_TYPE_STRUCT ||
+      ret == FZL_TYPE_HANDLE)
   {
     res = fzl_symt_setobjclass(gen->syms[0], node->ext_fn.name, ex_retcn);
     if (res != FZL_SYMTABLE_RESULT_OK)
@@ -130,7 +128,8 @@ gen_res_t gen_externfn(fzl_gen_t *gen, fzl_node_t *node)
   result->args_count  = args_count;
   result->has_return  = ret != FZL_TYPE_NULL;
   result->used_name   = node->ext_fn.name;
-  result->symbol_name = node->ext_fn.original_name;
+  result->symbol_name = node->ext_fn.original_name ? node->ext_fn.original_name
+                                                  : node->ext_fn.name;
 
   return gen_ok_null;
 }
diff --git a/src/compiler/generator/gen_struct.c b/src/compiler/generator/gen_struct.c
index d3c29a4..b2fd993 100644
--- a/src/compiler/generator/gen_struct.c
+++ b/src/compiler/generator/gen_struct.c
@@ -17,10 +17,7 @@ gen_res_t gen_struct(fzl_gen_t *gen, fzl_node_t *node)
   if (!gen || !node)
     return gen_error;
 
-  type_buf.kind      = FZL_EXTERN_KIND_STRUCT;
-  fzl_gen_ctx_t *ctx = gen_ctx(gen, FZL_GEN_CTX_TYPE_UNECCESSARY, node);
-  if (!ctx)
-    return gen_error;
+  type_buf.kind = FZL_EXTERN_KIND_STRUCT;
 
   size_t remainder = 2;
   size_t count     = 0;
@@ -32,12 +29,6 @@ gen_res_t gen_struct(fzl_gen_t *gen, fzl_node_t *node)
   for (size_t i = 0; i < node->structure.entries_count; i++)
   {
     fzl_node_t *fnode = node->structure.entries[i];
-    if (gen_common(gen, fnode).error)
-    {
-      free(fields);
-      return gen_error;
-    }
-
     if (count >= remainder)
     {
       remainder *= 2;