wip: working on generator

- Feat: add extern type resolving to type slot
- Feat: add extern block handling
- Feat: add extern function handling

.clangd

@@ -0,0 +1,4 @@
+Style:
+  AngledHeaders: [".*"]
+  QuotedHeaders: []
+

.gitignore

@@ -11,6 +11,7 @@
 
 # Files
 !/.clang-format
+!/.clangd
 !/.gdbinit
 !/.gitignore
 !/CMakeLists.txt

include/compiler/internals/gen.h

@@ -1,6 +1,7 @@
 #ifndef INTERNALS_GEN_H
 #define INTERNALS_GEN_H
 
+#include <common/fzl_extern.h>
 #include <common/fzl_opcodes.h>
 #include <common/fzl_types.h>
 #include <compiler/fzl_gen.h>
@@ -10,11 +11,13 @@
 #include <compiler/utils/fzl_symtable.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdio.h>
 
 extern char *null_name;
 
 bool gen_resolve_name(fzl_gen_t *gen, char *name, fzl_sym_t *sym);
 bool gen_resolve_type(fzl_gen_t *gen, fzl_token_t *tok, fzl_type_t *t, char *c);
+ssize_t gen_resolve_extern_type(fzl_gen_t *gen, char *name);
 bool gen_is_types_compatible(fzl_type_t t1, fzl_type_t t2, char *c1, char *c2);
 size_t gen_add_const(fzl_gen_t *gen, fzl_const_t c);
 void gen_op(fzl_gen_t *gen, fzl_opcode_t opcode);

src/compiler/generator/gen_extern.c

@@ -0,0 +1,24 @@
+#include <common/fzl_extern.h>
+#include <compiler/fzl_gen.h>
+#include <compiler/internals/gen.h>
+#include <stdbool.h>
+
+// Extern block
+bool gen_extern(fzl_gen_t *gen, fzl_node_t *node)
+{
+  if (!gen || !node)
+    return false;
+
+  gen->extern_libs[gen->extern_libs_count++] =
+      (fzl_extern_lib_t){.name = (char *)node->ext.libname};
+
+  for (size_t i = 0; i < node->ext.typedefs_count; i++)
+    if (!gen_common(gen, node->ext.typedefs[i]))
+      return false;
+
+  for (size_t i = 0; i < node->ext.fns_count; i++)
+    if (!gen_common(gen, node->ext.fns[i]))
+      return false;
+
+  return true;
+}

src/compiler/generator/gen_externfn.c

@@ -0,0 +1,124 @@
+#include <common/fzl_extern.h>
+#include <common/fzl_types.h>
+#include <compiler/fzl_gen.h>
+#include <compiler/fzl_parser.h>
+#include <compiler/internals/gen.h>
+#include <compiler/utils/fzl_symtable.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// External function definition
+bool gen_externfn(fzl_gen_t *gen, fzl_node_t *node)
+{
+  if (!gen || !node)
+    return false;
+
+  fzl_gen_ctx_t *ctx = gen_ctx(gen, FZL_GEN_CTX_TYPE_FUNCTION, node);
+  if (!ctx)
+    return false;
+
+  size_t args_remainder  = 2;
+  size_t args_count      = 0;
+  fzl_extern_arg_t *args = malloc(args_remainder * sizeof(fzl_extern_arg_t));
+  if (!args)
+    return false;
+
+  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))
+      return false;
+
+    if (args_count >= args_remainder)
+    {
+      args_remainder *= 2;
+      fzl_extern_arg_t *newargs =
+          realloc(args, args_remainder * sizeof(fzl_extern_arg_t));
+      if (!newargs)
+      {
+        free(args);
+        return false;
+      }
+
+      args = newargs;
+    }
+
+    if (argnode->type != FZL_NODETYPE_DECLARATION)
+    {
+      free(args);
+      return false;
+    }
+
+    fzl_extern_arg_t *arg = &args[args_count++];
+
+    fzl_type_t argtype;
+    char argcn[256];
+    memset(argcn, 0, sizeof(argcn));
+
+    bool resolved = gen_resolve_type(gen, argnode->var.type, &argtype, argcn);
+    if (!resolved)
+    {
+      free(args);
+      return false;
+    }
+
+    ssize_t slot = gen_resolve_extern_type(gen, argcn);
+    if (slot == -1)
+      arg->type =
+          (fzl_extern_type_ref_t){.is_primitive = true, .primitive = argtype};
+    else
+      arg->type =
+          (fzl_extern_type_ref_t){.is_primitive = false, .type_slot = slot};
+
+    arg->name   = (char *)argnode->var.identifier->token->value;
+    arg->is_out = argnode->var.is_out;
+  }
+
+  ctx = gen_fin_ctx(gen);
+  if (!ctx)
+  {
+    free(args);
+    return false;
+  }
+
+  fzl_type_t ret;
+  char retname[256];
+  memset(retname, 0, sizeof(retname));
+
+  bool resolved = gen_resolve_type(gen, node->ext_fn.type, &ret, retname);
+  if (!resolved)
+  {
+    free(args);
+    return false;
+  }
+
+  fzl_symtable_res_t res = fzl_symt_put(gen->syms[0], node, node->ext_fn.name,
+                                        FZL_TYPE_EXTERN_FN, 0);
+  if (res != FZL_SYMTABLE_RESULT_OK)
+  {
+    free(args);
+    return false;
+  }
+
+  fzl_extern_fn_t *result = &gen->extern_fns[gen->extern_fns_count++];
+
+  ssize_t slot = gen_resolve_extern_type(gen, retname);
+  if (slot == -1)
+    result->ret_type =
+        (fzl_extern_type_ref_t){.is_primitive = true, .primitive = ret};
+  else
+    result->ret_type =
+        (fzl_extern_type_ref_t){.is_primitive = false, .type_slot = slot};
+
+  result->lib_slot    = gen->extern_libs_count - 1;
+  result->args        = args;
+  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;
+
+  return true;
+}

src/compiler/generator/utility.c

@@ -95,6 +95,21 @@ bool gen_resolve_type(fzl_gen_t *gen, fzl_token_t *tok, fzl_type_t *t, char *c)
   return true;
 }
 
+// Resolve external type
+ssize_t gen_resolve_extern_type(fzl_gen_t *gen, char *name)
+{
+  if (!gen || !name)
+    return -1;
+
+  for (size_t i = 0; i < gen->extern_types_count; i++)
+  {
+    if (strcmp(name, gen->extern_types[i].name) == 0)
+      return i;
+  }
+
+  return -1;
+}
+
 // Check if left and right types are compatible
 bool gen_is_types_compatible(fzl_type_t t1, fzl_type_t t2, char *c1, char *c2)
 {