Merge branch 'master' into docs

CMakeLists.txt

@@ -1,8 +1,14 @@
-cmake_minimum_required(VERSION 4.3)
+cmake_minimum_required(VERSION 3.16)
 project(fz-lang
 	LANGUAGES C)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+add_compile_options(-Wall -Wextra -Werror=implicit-function-declaration)
+
+if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+	add_compile_options(-fsanitize=address,undefined -g)
+	add_link_options(-fsanitize=address,undefined)
+endif()
 
 include_directories(include)
 

include/compiler/utils/fzl_const_pool.h

@@ -4,12 +4,12 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
 
 // Constant types
 typedef enum
 {
   FZL_CONSTTYPE_STRING,
-  FZL_CONSTTYPE_NUMBER
 } fzl_consttype_t;
 
 // Constant descriptor
@@ -34,7 +34,7 @@ typedef struct
 
 typedef struct
 {
-  size_t pool_index;
+  ssize_t pool_index;
 } fzl_const_hash_slot_t;
 
 // Constant pool descriptor
@@ -53,13 +53,13 @@ typedef struct
 bool fzl_consts_equal(fzl_const_t a, fzl_const_t b);
 
 // Get hash of specified constant
-static uint32_t fzl_hash_const(fzl_const_t c);
+uint32_t fzl_hash_const(fzl_const_t c);
 
 // Allocate constants hash pool
 fzl_const_hash_pool_t *fzl_mkconstpool();
 
 // Resize the hash table
-static void fzl_consts_pool_resize_hash(fzl_const_hash_pool_t *pool);
+void fzl_consts_pool_resize_hash(fzl_const_hash_pool_t *pool);
 
 // Push constant. Returns unique index
 size_t fzl_consts_pool_add(fzl_const_hash_pool_t *pool, fzl_const_t c);

src/compiler/fzl_debug.c

@@ -27,7 +27,6 @@ void print_node(fzl_node_t *node, int level)
   if (!node)
     return;
 
-  size_t lvllen = print_level(levelbuf, level);
   strcpy(printbuf, levelbuf);
 
   switch (node->type)

src/compiler/fzl_parser.c

@@ -9,6 +9,24 @@
 char plast_err[256];
 fzl_token_t *last_known_tok = NULL;
 
+fzl_token_t null_tok = {
+    .type        = FZL_TOKTYPE_TYPE,
+    .filename    = "",
+    .ln          = 0,
+    .cn          = 0,
+    .store_value = false,
+    .value       = "null",
+    .value_sz    = 4,
+};
+
+fzl_token_t this_tok = {.type        = FZL_TOKTYPE_NAME,
+                        .filename    = "",
+                        .ln          = 0,
+                        .cn          = 0,
+                        .store_value = false,
+                        .value       = "this",
+                        .value_sz    = 4};
+
 fzl_parser_t *fzl_mkparser(fzl_reader_ll_t *first)
 {
   if (!first)
@@ -35,6 +53,7 @@ fzl_parser_t *fzl_mkparser(fzl_reader_ll_t *first)
 fzl_node_t *fzl_mknode(fzl_nodetype_t type, fzl_token_t *token)
 {
   fzl_node_t *node = malloc(sizeof(fzl_node_t));
+  memset(node, 0, sizeof(fzl_node_t));
 
   if (!node)
     return NULL;
@@ -56,19 +75,6 @@ static fzl_token_t *peek(fzl_parser_t *parser)
   return parser->cursor->token;
 }
 
-// Get token at (cursor + 1)
-static fzl_token_t *next(fzl_parser_t *parser)
-{
-  if (!parser || !parser->cursor)
-    return NULL;
-
-  fzl_reader_ll_t *next = parser->cursor->next;
-  if (!next)
-    return NULL;
-
-  return next->token;
-}
-
 // Consume token at cursor and move to the next
 static fzl_token_t *consume(fzl_parser_t *parser)
 {
@@ -204,8 +210,7 @@ fzl_node_t *parse_postfix(fzl_parser_t *parser)
   if (!parser)
     return NULL;
 
-  fzl_node_t *left  = parse_primary(parser);
+  fzl_node_t *left = parse_primary(parser);
-  fzl_node_t *right = NULL;
 
   if (!left)
   {
@@ -240,7 +245,7 @@ fzl_node_t *parse_postfix(fzl_parser_t *parser)
           if (args_capacity <= args_count)
           {
             args_capacity *= 2;
-            args = realloc(args, args_capacity * sizeof(fzl_node_t));
+            args = realloc(args, args_capacity * sizeof(fzl_node_t *));
           }
 
           args[args_count] = arg;
@@ -714,19 +719,27 @@ fzl_node_t *parse_class(fzl_parser_t *parser)
         }
       }
 
-      fzl_node_t **new_args = realloc(node->fn.args, ++node->fn.args_count);
+      fzl_node_t **new_args = realloc(node->fn.args, (++node->fn.args_count) *
-      memcpy(&new_args[1], new_args,
+                                                         sizeof(fzl_node_t *));
-             (node->fn.args_count - 1) * sizeof(fzl_node_t *));
+      if (!new_args)
+      {
+        snprintf(plast_err, sizeof(plast_err),
+                 "failed to reallocate method args list");
+        free(fields);
+        return NULL;
+      }
 
-      fzl_token_t *this_tok =
+      if (node->fn.args_count > 1)
-          fzl_mktoken(FZL_TOKTYPE_NAME, node->fn.name->ln, node->fn.name->cn,
+        memmove(&new_args[1], new_args,
-                      "this", 4, node->fn.name->filename);
+                (node->fn.args_count - 1) * sizeof(fzl_node_t *));
-      fzl_node_t *this_id      = fzl_mknode(FZL_NODETYPE_IDENTIFIER, this_tok);
+
+      fzl_node_t *this_id      = fzl_mknode(FZL_NODETYPE_IDENTIFIER, &this_tok);
       fzl_node_t *this_dec     = fzl_mknode(FZL_NODETYPE_DECLARATION, name);
       this_dec->var.type       = name;
       this_dec->var.identifier = this_id;
 
       new_args[0]       = this_dec;
+      node->fn.args     = new_args;
       methods[mcount++] = node;
     }
     else
@@ -766,7 +779,15 @@ fzl_node_t *parse_function(fzl_parser_t *parser)
   if (!parser)
     return NULL;
 
-  fzl_token_t *fn   = consume(parser);
+  fzl_token_t *fn = consume(parser);
+  if (fn->type != FZL_TOKTYPE_FUNCTION)
+  {
+    snprintf(plast_err, sizeof(plast_err),
+             "'%s': expected keyword 'fn' at %ld:%ld", last_known_tok->filename,
+             last_known_tok->ln, last_known_tok->cn);
+    return NULL;
+  }
+
   fzl_token_t *name = consume(parser);
   if (!name || name->type != FZL_TOKTYPE_NAME)
   {
@@ -820,8 +841,7 @@ fzl_node_t *parse_function(fzl_parser_t *parser)
     type = consume(parser);
 
   if (!type)
-    type = fzl_mktoken(FZL_TOKTYPE_TYPE, last_known_tok->ln, last_known_tok->cn,
+    type = &null_tok;
-                       "null", 4, last_known_tok->filename);
 
   if (!is(parser, FZL_TOKTYPE_LBRACE))
   {
@@ -959,6 +979,9 @@ fzl_node_t *parse_block(fzl_parser_t *parser)
 // Statement parsing
 fzl_node_t *parse_statement(fzl_parser_t *parser)
 {
+  if (!peek(parser))
+    return NULL;
+
   fzl_node_t *res = NULL;
 
   if (is(parser, FZL_TOKTYPE_CLASS))
@@ -990,6 +1013,9 @@ fzl_node_t *parse_statement(fzl_parser_t *parser)
 // Internal parsing entry point
 fzl_node_t *parse_program(fzl_parser_t *parser)
 {
+  if (!peek(parser))
+    return NULL;
+
   fzl_node_t *first = NULL;
   fzl_node_t *last  = NULL;
   fzl_node_t *node  = NULL;
@@ -1023,6 +1049,8 @@ fzl_node_t *parse_program(fzl_parser_t *parser)
 // Parse tokens and build AST
 int fzl_parse(fzl_parser_t *parser)
 {
+  last_known_tok = NULL;
+
   fzl_node_t *ast = parse_program(parser);
   if (!ast)
     return -1;
@@ -1049,80 +1077,119 @@ void fzl_freeast(fzl_node_t *root)
 
   while (root)
   {
-    if (root->type == FZL_NODETYPE_BLOCK)
+    switch (root->type)
     {
-      if (root->list.entries)
+      case FZL_NODETYPE_IDENTIFIER:
-      {
+      case FZL_NODETYPE_LITERAL:
-        for (size_t i = 0; i < root->list.entry_count; i++)
+        break;
-          if (root->list.entries[i])
-            fzl_freeast(root->list.entries[i]);
 
-        free(root->list.entries);
+      case FZL_NODETYPE_BLOCK:
-      }
+        if (root->list.entries)
-    }
+        {
-    else if (root->type == FZL_NODETYPE_CALL)
+          for (size_t i = 0; i < root->list.entry_count; i++)
-    {
+            if (root->list.entries[i])
-      if (root->call.args_count)
+              fzl_freeast(root->list.entries[i]);
-      {
-        for (size_t i = 0; i < root->call.args_count; i++)
-          if (root->call.args[i])
-            fzl_freeast(root->call.args[i]);
 
-        free(root->call.args);
+          free(root->list.entries);
-      }
+        }
-    }
+        break;
-    else if (root->type == FZL_NODETYPE_ADD || root->type == FZL_NODETYPE_SUB ||
-             root->type == FZL_NODETYPE_MUL || root->type == FZL_NODETYPE_DIV ||
-             root->type == FZL_NODETYPE_POW || root->type == FZL_NODETYPE_MOD)
-    {
-      if (root->binary_op.left)
-        fzl_freeast(root->binary_op.left);
-      if (root->binary_op.right)
-        fzl_freeast(root->binary_op.right);
-    }
-    else if (root->type == FZL_NODETYPE_UNARY_PLUS ||
-             root->type == FZL_NODETYPE_UNARY_MINUS)
-    {
-      if (root->unary_op.operand)
-        fzl_freeast(root->unary_op.operand);
-    }
-    else if (root->type == FZL_NODETYPE_FUNCTION)
-    {
-      if (root->fn.args_count)
-        for (size_t i = 0; i < root->fn.args_count; i++)
-          fzl_freenode(root->fn.args[i]);
-      free(root->fn.args);
-      fzl_freenode(root->fn.body);
-    }
-    else if (root->type == FZL_NODETYPE_RETURN)
-    {
-      if (root->ret.value)
-        fzl_freenode(root->ret.value);
-    }
-    else if (root->type == FZL_NODETYPE_CLASS)
-    {
-      if (root->class.fields_count)
-        for (size_t i = 0; i < root->class.fields_count; i++)
-          fzl_freenode(root->class.fields[i]);
-      free(root->class.fields);
 
-      if (root->class.methods_count)
+      case FZL_NODETYPE_CALL:
-        for (size_t i = 0; i < root->class.methods_count; i++)
+        if (root->call.callee)
-          fzl_freenode(root->class.methods[i]);
+          fzl_freeast(root->call.callee);
-      free(root->class.methods);
+
-    }
+        if (root->call.args_count)
-    else if (root->type == FZL_NODETYPE_CONSTRUCT)
+        {
-    {
+          for (size_t i = 0; i < root->call.args_count; i++)
-      fzl_freenode(root->construct.name);
+            if (root->call.args[i])
-    }
+              fzl_freeast(root->call.args[i]);
-    else if (root->type == FZL_NODETYPE_FIELD)
+        }
-    {
+        if (root->call.args)
-      fzl_freenode(root->memb.field);
+          free(root->call.args);
-      fzl_freenode(root->memb.parent);
+        break;
+
+      case FZL_NODETYPE_CONDITIONAL:
+        if (root->cond.condition)
+          fzl_freeast(root->cond.condition);
+
+        if (root->cond.true_block)
+          fzl_freeast(root->cond.true_block);
+
+        if (root->cond.else_block)
+          fzl_freeast(root->cond.else_block);
+        break;
+
+      case FZL_NODETYPE_ADD:
+      case FZL_NODETYPE_SUB:
+      case FZL_NODETYPE_MUL:
+      case FZL_NODETYPE_DIV:
+      case FZL_NODETYPE_POW:
+      case FZL_NODETYPE_MOD:
+      case FZL_NODETYPE_OR:
+      case FZL_NODETYPE_AND:
+      case FZL_NODETYPE_EQUAL:
+      case FZL_NODETYPE_NEQUAL:
+      case FZL_NODETYPE_LESS:
+      case FZL_NODETYPE_LESS_EQUAL:
+      case FZL_NODETYPE_GREATER:
+      case FZL_NODETYPE_GREATER_EQUAL:
+      case FZL_NODETYPE_ASSIGN:
+        if (root->binary_op.left)
+          fzl_freeast(root->binary_op.left);
+        if (root->binary_op.right)
+          fzl_freeast(root->binary_op.right);
+        break;
+
+      case FZL_NODETYPE_UNARY_PLUS:
+      case FZL_NODETYPE_UNARY_MINUS:
+      case FZL_NODETYPE_NOT:
+        if (root->unary_op.operand)
+          fzl_freeast(root->unary_op.operand);
+        break;
+
+      case FZL_NODETYPE_FUNCTION:
+        if (root->fn.args_count)
+          for (size_t i = 0; i < root->fn.args_count; i++)
+            fzl_freeast(root->fn.args[i]);
+        free(root->fn.args);
+        fzl_freeast(root->fn.body);
+        break;
+
+      case FZL_NODETYPE_RETURN:
+        if (root->ret.value)
+          fzl_freeast(root->ret.value);
+        break;
+
+      case FZL_NODETYPE_CLASS:
+        if (root->class.fields_count)
+          for (size_t i = 0; i < root->class.fields_count; i++)
+            fzl_freeast(root->class.fields[i]);
+        free(root->class.fields);
+
+        if (root->class.methods_count)
+          for (size_t i = 0; i < root->class.methods_count; i++)
+            fzl_freeast(root->class.methods[i]);
+        free(root->class.methods);
+        break;
+
+      case FZL_NODETYPE_CONSTRUCT:
+        fzl_freeast(root->construct.name);
+        break;
+
+      case FZL_NODETYPE_FIELD:
+        fzl_freeast(root->memb.field);
+        fzl_freeast(root->memb.parent);
+        break;
+
+      case FZL_NODETYPE_DECLARATION:
+        if (root->var.identifier)
+          fzl_freeast(root->var.identifier);
+        break;
     }
 
-    root = root->next;
+    fzl_node_t *next = root->next;
-    free(root);
+    fzl_freenode(root);
+    root = next;
   }
 }
 

src/compiler/fzl_reader.c

@@ -204,31 +204,31 @@ fzl_token_t *parse_number(fzl_reader_t *reader)
 // Add single-char token
 fzl_token_t *add_single(fzl_reader_t *reader, fzl_toktype_t type)
 {
-  size_t p = move(reader, 1);
   fzl_file_loc l;
-  bool ok = fzl_linked_getpos(reader->linked, p, &l);
+  bool ok = fzl_linked_getpos(reader->linked, reader->position, &l);
   if (!ok)
   {
     snprintf(last_err, sizeof(last_err), "failed to locate line:col");
     return NULL;
   }
 
-  return fzl_mktoken(type, l.line, l.col, NULL, 0, l.filename);
+  move(reader, 1);
+  return fzl_mktoken(type, l.line, l.col, "", 0, l.filename);
 }
 
 // Add double-char token
 fzl_token_t *add_double(fzl_reader_t *reader, fzl_toktype_t type)
 {
-  size_t p = move(reader, 2);
   fzl_file_loc l;
-  bool ok = fzl_linked_getpos(reader->linked, p, &l);
+  bool ok = fzl_linked_getpos(reader->linked, reader->position, &l);
   if (!ok)
   {
     snprintf(last_err, sizeof(last_err), "failed to locate line:col");
     return NULL;
   }
 
-  return fzl_mktoken(type, l.line, l.col, NULL, 0, l.filename);
+  move(reader, 2);
+  return fzl_mktoken(type, l.line, l.col, "", 0, l.filename);
 }
 
 // Skip symbols until '\n' or EOF
@@ -313,7 +313,7 @@ int fzl_read(fzl_reader_t *reader)
       token = add_single(reader, FZL_TOKTYPE_PERCENT);
     else if (curr == '=')
       token = add_single(reader, FZL_TOKTYPE_EQ);
-    else if (curr >= 'A' && curr <= 'Z' || curr >= 'a' && curr <= 'z' ||
+    else if ((curr >= 'A' && curr <= 'Z') || (curr >= 'a' && curr <= 'z') ||
              curr == '_')
       token = parse_name(reader);
     else if (curr >= '0' && curr <= '9')
@@ -353,6 +353,7 @@ int fzl_read(fzl_reader_t *reader)
     }
 
     fzl_reader_ll_t *tok_node = malloc(sizeof(fzl_reader_ll_t));
+    tok_node->next            = NULL;
     tok_node->token           = token;
 
     reader->last->next = tok_node;

src/compiler/fzl_token.c

@@ -6,15 +6,20 @@
 fzl_token_t *fzl_mktoken(const fzl_toktype_t type, size_t line, size_t col,
                          void *value, size_t value_len, char *filename)
 {
-  char *valholder = malloc(value_len + 1);
+  char *valholder = NULL;
-  memcpy(valholder, value, value_len);
+
-  valholder[value_len] = '\0';
+  if (value && value_len > 0)
+  {
+    valholder = malloc(value_len + 1);
+    memcpy(valholder, value, value_len);
+    valholder[value_len] = '\0';
+  }
 
   fzl_token_t *token = malloc(sizeof(fzl_token_t));
   token->type        = type;
   token->ln          = line;
   token->cn          = col;
-  token->store_value = value_len > 0;
+  token->store_value = (valholder != NULL);
   token->value       = valholder;
   token->value_sz    = value_len;
   token->filename    = filename;

src/compiler/fzl_walker.c

@@ -64,7 +64,7 @@ fzl_walker_t *fzl_mkwalker(fzl_node_t *root)
 // --- Walking zone ---
 
 // Convert type token to `fzl_type_t`
-const fzl_type_t tok_to_type(fzl_token_t *tok)
+fzl_type_t tok_to_type(fzl_token_t *tok)
 {
   if (tok->type == FZL_TOKTYPE_NAME)
     return FZL_TYPE_OBJECT;
@@ -246,6 +246,9 @@ fzl_walk_res_t walk(fzl_walker_t *walker, fzl_node_t *node)
           strcpy((method_name + classname_len + 1), fn->fn.name->value);
           method_name[classname_len + fnname_len + 1] = 0;
 
+          if (fn->fn.name->value)
+            free(fn->fn.name->value);
+
           fn->fn.name->value   = method_name;
           fzl_walk_res_t fnres = walk(walker, fn);
           if (fnres.error)
@@ -403,7 +406,7 @@ fzl_walk_res_t walk(fzl_walker_t *walker, fzl_node_t *node)
         }
 
         // NOTE: add sym_top limit check
-        size_t lvl                      = walker->sym_top;
+        ssize_t lvl                     = walker->sym_top;
         walker->syms[walker->sym_top++] = fzl_mksymt();
 
         fzl_walk_ctx_t *newctx = nest_ctx(walker, FZL_WALK_CTX_TYPE_FN);
@@ -939,7 +942,6 @@ fzl_walk_res_t walk(fzl_walker_t *walker, fzl_node_t *node)
         }
         else if (node->token->type == FZL_TOKTYPE_NULL_LITERAL)
         {
-          fzl_token_t *tok = node->token;
           push_op(walker, FZL_OPCODE_PUSHNUM);
           push_word(walker, 0);
           push_op(walker, FZL_OPCODE_DEREFERENCE);
@@ -1145,7 +1147,7 @@ fzl_walk_res_t walk(fzl_walker_t *walker, fzl_node_t *node)
           if (obj_res.error)
             return obj_res;
 
-          fzl_ctable_t *ct;
+          fzl_ctable_t *ct = NULL;
           for (size_t i = 0; i < walker->classes_count; i++)
           {
             if (strcmp(obj_res.classname, walker->classes[i]->name) == 0)
@@ -1164,7 +1166,7 @@ fzl_walk_res_t walk(fzl_walker_t *walker, fzl_node_t *node)
             return (fzl_walk_res_t){.error = true, .error_msg = wlast_err};
           }
 
-          fzl_ctable_field_t *ctf;
+          fzl_ctable_field_t *ctf = NULL;
           for (size_t i = 0; i < ct->fields_count; i++)
           {
             if (strcmp(field_node->memb.field->token->value,

src/compiler/main.c

@@ -15,9 +15,15 @@ int main(int argc, char **argv)
 {
   fzl_options_t *opts = fzl_mkoptions(argc, argv);
   if (!opts)
+  {
+    fzl_freeoptions(opts);
     return -1;
+  }
   else if (!opts->should_continue)
+  {
+    fzl_freeoptions(opts);
     return 0;
+  }
 
   if (opts->verbose)
     printf("%s> analyze\n-> reading file...%s", FZL_CDEBUG, FZL_CRST);
@@ -28,6 +34,8 @@ int main(int argc, char **argv)
     char *lasterr = fzl_linked_geterror();
     if (lasterr[0])
       printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, lasterr);
+    fzl_freeoptions(opts);
+    fzl_freelinked(linked);
     return -1;
   }
 
@@ -38,6 +46,8 @@ int main(int argc, char **argv)
     char *lasterr = fzl_linked_geterror();
     if (lasterr[0])
       printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, lasterr);
+    fzl_freeoptions(opts);
+    fzl_freelinked(linked);
     return -1;
   }
 
@@ -53,6 +63,9 @@ int main(int argc, char **argv)
   if (result != 0)
   {
     printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, fzl_reader_geterror());
+    fzl_freeoptions(opts);
+    fzl_freelinked(linked);
+    fzl_freereader(rd);
     return -1;
   }
 
@@ -87,6 +100,10 @@ int main(int argc, char **argv)
   if (result != 0)
   {
     printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, fzl_parser_geterror());
+    fzl_freeoptions(opts);
+    fzl_freeparser(parser);
+    fzl_freereader(rd);
+    fzl_freelinked(linked);
     return -1;
   }
 
@@ -103,6 +120,11 @@ int main(int argc, char **argv)
   if (result != 0)
   {
     printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, fzl_walker_geterror());
+    fzl_freeoptions(opts);
+    fzl_freewalker(walker);
+    fzl_freeparser(parser);
+    fzl_freereader(rd);
+    fzl_freelinked(linked);
     return -1;
   }
 
@@ -144,6 +166,12 @@ int main(int argc, char **argv)
   if (result != 0)
   {
     printf("%sError%s: %s\n", FZL_CERROR, FZL_CRST, fzl_writer_geterror());
+    fzl_freeoptions(opts);
+    fzl_freewriter(writer);
+    fzl_freewalker(walker);
+    fzl_freeparser(parser);
+    fzl_freereader(rd);
+    fzl_freelinked(linked);
     return -1;
   }
 

src/compiler/utils/fzl_const_pool.c

@@ -11,31 +11,31 @@ bool fzl_consts_equal(fzl_const_t a, fzl_const_t b)
 
   switch (a.type)
   {
-  case FZL_CONSTTYPE_STRING:
+    case FZL_CONSTTYPE_STRING:
-  {
+    {
-    if (a.as.string.length != b.as.string.length)
+      if (a.as.string.length != b.as.string.length)
-      return false;
+        return false;
 
-    return memcmp(a.as.string.chars, b.as.string.chars, a.as.string.length) ==
+      return memcmp(a.as.string.chars, b.as.string.chars, a.as.string.length) ==
-           0;
+             0;
-  }
+    }
   }
 
   return false;
 }
 
-static uint32_t fzl_hash_const(fzl_const_t c)
+uint32_t fzl_hash_const(fzl_const_t c)
 {
-  uint32_t hash = 2166136261u;
+  uint32_t hash       = 2166136261u;
   const uint8_t *data = NULL;
-  size_t size = 0;
+  size_t size         = 0;
 
   switch (c.type)
   {
-  case FZL_CONSTTYPE_STRING:
+    case FZL_CONSTTYPE_STRING:
-    data = (const uint8_t *)c.as.string.chars;
+      data = (const uint8_t *)c.as.string.chars;
-    size = c.as.string.length;
+      size = c.as.string.length;
-    break;
+      break;
   }
 
   for (size_t i = 0; i < size; i++)
@@ -51,27 +51,27 @@ fzl_const_hash_pool_t *fzl_mkconstpool()
 {
   fzl_const_hash_pool_t *pool = malloc(sizeof(fzl_const_hash_pool_t));
 
-  pool->size = 0;
+  pool->size     = 0;
   pool->capacity = 8;
-  pool->array = malloc(pool->capacity * sizeof(fzl_const_t));
+  pool->array    = malloc(pool->capacity * sizeof(fzl_const_t));
 
-  pool->slots_count = 0;
+  pool->slots_count    = 0;
   pool->slots_capacity = 16;
   pool->slots = malloc(pool->slots_capacity * sizeof(fzl_const_hash_slot_t));
-  for (int i = 0; i < pool->slots_capacity; i++)
+  for (size_t i = 0; i < pool->slots_capacity; i++)
     pool->slots[i].pool_index = -1;
 
   return pool;
 }
 
-static void fzl_consts_pool_resize_hash(fzl_const_hash_pool_t *pool)
+void fzl_consts_pool_resize_hash(fzl_const_hash_pool_t *pool)
 {
-  int old_capacity = pool->slots_capacity;
+  int old_capacity                 = pool->slots_capacity;
   fzl_const_hash_slot_t *old_slots = pool->slots;
 
   pool->slots_capacity = old_capacity * 2;
   pool->slots = malloc(pool->slots_capacity * sizeof(fzl_const_hash_slot_t));
-  for (int i = 0; i < pool->slots_capacity; i++)
+  for (size_t i = 0; i < pool->slots_capacity; i++)
     pool->slots[i].pool_index = -1;
   pool->slots_count = 0;
 
@@ -81,8 +81,8 @@ static void fzl_consts_pool_resize_hash(fzl_const_hash_pool_t *pool)
       continue;
 
     int index_in_pool = old_slots[i].pool_index;
-    fzl_const_t c = pool->array[index_in_pool];
+    fzl_const_t c     = pool->array[index_in_pool];
-    uint32_t hash = fzl_hash_const(c);
+    uint32_t hash     = fzl_hash_const(c);
 
     uint32_t bucket = hash & (pool->slots_capacity - 1);
     while (pool->slots[bucket].pool_index != -1)
@@ -100,7 +100,7 @@ size_t fzl_consts_pool_add(fzl_const_hash_pool_t *pool, fzl_const_t c)
   if (pool->slots_count * 4 >= pool->slots_capacity * 3)
     fzl_consts_pool_resize_hash(pool);
 
-  uint32_t hash = fzl_hash_const(c);
+  uint32_t hash   = fzl_hash_const(c);
   uint32_t bucket = hash & (pool->slots_capacity - 1);
 
   while (pool->slots[bucket].pool_index != -1)
@@ -119,7 +119,7 @@ size_t fzl_consts_pool_add(fzl_const_hash_pool_t *pool, fzl_const_t c)
                                          pool->capacity * sizeof(fzl_const_t));
   }
 
-  size_t new_index = pool->size;
+  size_t new_index       = pool->size;
   pool->array[new_index] = c;
   pool->size++;
 

src/compiler/utils/fzl_linked.c

@@ -72,9 +72,9 @@ bool fzl_linked_add_files(fzl_linked_t *l, char **files, size_t files_count)
                              .end   = current_start + file_sz - 1};
 
     if (!l->source)
-      l->source = malloc(file_sz);
+      l->source = malloc(file_sz + 1);
     else
-      l->source = realloc(l->source, current_start + file_sz);
+      l->source = realloc(l->source, current_start + file_sz + 1);
 
     if (!l->source)
     {
@@ -86,6 +86,7 @@ bool fzl_linked_add_files(fzl_linked_t *l, char **files, size_t files_count)
     }
 
     strcpy(l->source + current_start, source);
+    free(source);
     current_start += file_sz;
   }
 

src/compiler/utils/fzl_options.c

@@ -36,7 +36,7 @@ fzl_options_t *fzl_mkoptions(int argc, char **argv)
     return opts;
   }
 
-  size_t i;
+  int i;
   for (i = 1; i < argc; i++)
   {
     if (argv[i][0] != '-')
@@ -112,7 +112,7 @@ fzl_options_t *fzl_mkoptions(int argc, char **argv)
   {
     printf("%sError%s: flags should go before source files list.\n", FZL_CERROR,
            FZL_CRST);
-    printf("Remain %zu arguments are not handled.\n", argc - 1 - i);
+    printf("Remain %d arguments are not handled.\n", argc - 1 - i);
 
     free(files);
     free(opts);

src/vm/fzl_vm.c

@@ -42,6 +42,7 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
   if (!fd)
   {
     snprintf(last_err, sizeof(last_err), "failed to open file '%s'", filepath);
+    free(vm);
     return NULL;
   }
 
@@ -50,6 +51,8 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
   if (memcmp(hdr, expect_hdr, 5) != 0)
   {
     snprintf(last_err, sizeof(last_err), "magic check error");
+    fclose(fd);
+    free(vm);
     return NULL;
   }
 
@@ -60,6 +63,8 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
   if (ops_count < 1)
   {
     snprintf(last_err, sizeof(last_err), "there is nothing to do (0 ops)");
+    fclose(fd);
+    free(vm);
     return NULL;
   }
 
@@ -89,6 +94,9 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
       }
       else
       {
+        fclose(fd);
+        free(vm->consts);
+        free(vm);
         snprintf(last_err, sizeof(last_err), "unknown const type at index %ld",
                  i);
         return NULL;
@@ -104,6 +112,7 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
     fread(&op, sizeof(uint64_t), 1, fd);
     vm->ops[i] = op;
   }
+  fclose(fd);
 
   return vm;
 }
@@ -184,7 +193,7 @@ void print_object(fzl_vm_object_t *obj)
     else if (arg.type == FZL_TYPE_UINT)
       printf("uint(%lu)", arg.as.u);
     else if (arg.type == FZL_TYPE_BOOL)
-      printf("bool(%b)", arg.as.b);
+      printf("bool(%s)", arg.as.b ? "true" : "false");
     else if (arg.type == FZL_TYPE_NULL)
       printf("<null>");
     else if (arg.type == FZL_TYPE_OBJECT)
@@ -650,8 +659,17 @@ int fzl_vm_run(fzl_vm_t *vm)
         break;
 
       case FZL_OPCODE_JMP:
-        vm->ip = vm->ops[++vm->ip] - 1;
+      {
+        if (vm->ops_count <= vm->ip)
+        {
+          snprintf(last_err, sizeof(last_err),
+                   "runtime error - expected JMP addr");
+          return -1;
+        }
+        uint64_t jmp_ip = vm->ops[++vm->ip];
+        vm->ip          = jmp_ip - 1;
         break;
+      }
 
       case FZL_OPCODE_AND:
         if (vm->dtop < 2)
@@ -723,6 +741,14 @@ int fzl_vm_run(fzl_vm_t *vm)
           }
         }
 
+        if (wrlvl <= -1)
+        {
+          snprintf(last_err, sizeof(last_err),
+                   "runtime error - name '%s' not found in this scope", wrname);
+          print_err_data(vm);
+          return -1;
+        }
+
         fzl_vm_env_wresult_t wresult =
             fzl_env_writevalue(vm->estack[wrlvl], (char *)wrname, value);
         if (wresult != FZL_VM_ENV_WRESULT_OK)
@@ -807,7 +833,7 @@ int fzl_vm_run(fzl_vm_t *vm)
           else if (arg.type == FZL_TYPE_UINT)
             printf("%lu\n", arg.as.u);
           else if (arg.type == FZL_TYPE_BOOL)
-            printf("%b\n", arg.as.b);
+            printf("%s\n", arg.as.b ? "true" : "false");
           else if (arg.type == FZL_TYPE_NULL)
             printf("<null>\n");
           else if (arg.type == FZL_TYPE_OBJECT)
@@ -816,7 +842,7 @@ int fzl_vm_run(fzl_vm_t *vm)
         else if (fn_id == FZL_BUILTIN_EXIT)
         {
           fzl_value_t arg = vm->dstack[--vm->dtop];
-          exit(arg.as.i);
+          return arg.as.i;
         }
         else
         {
@@ -985,6 +1011,9 @@ void fzl_freevm(fzl_vm_t *vm)
   if (!vm)
     return;
 
+  while (vm->etop > 0)
+    fzl_freeenv(vm->estack[--vm->etop]);
+
   for (size_t i = 0; i < vm->consts_count; i++)
   {
     if (vm->consts[i].type == FZL_CONSTTYPE_STRING)

src/vm/fzl_vm_env.c

@@ -7,8 +7,6 @@
 #include <string.h>
 #include <vm/fzl_vm_env.h>
 
-static const fzl_value_t null = {.type = FZL_TYPE_NULL};
-
 fzl_vm_env_t *fzl_mkenv()
 {
   fzl_vm_env_t *env = malloc(sizeof(fzl_vm_env_t));

src/vm/main.c

@@ -34,7 +34,7 @@ run_args_t *parse_args(int argc, char **argv)
   args->help       = false;
   args->debug      = false;
 
-  for (size_t i = 0; i < argc; i++)
+  for (int i = 0; i < argc; i++)
   {
     if (argv[i][0] != '-')
       continue;
@@ -50,6 +50,7 @@ run_args_t *parse_args(int argc, char **argv)
     {
       printf("Error: unknown flag '%s'.\n", argv[i]);
       printf("Use 'fz --help' to read the usage\n");
+      free(args);
       return NULL;
     }
   }
@@ -58,6 +59,7 @@ run_args_t *parse_args(int argc, char **argv)
   {
     printf("Error: last argument MUST be a file path\n");
     printf("Use 'fz --help' for help\n");
+    free(args);
     return NULL;
   }
 
@@ -74,6 +76,7 @@ int main(int argc, char **argv)
   else if (args->help)
   {
     print_hint();
+    free(args);
     return 0;
   }
 
@@ -81,6 +84,7 @@ int main(int argc, char **argv)
   if (!vm)
   {
     printf("Error: %s\n", fzl_vm_geterror());
+    free(args);
     return -1;
   }
 
@@ -91,7 +95,12 @@ int main(int argc, char **argv)
     int result = fzl_vm_run(vm);
     if (result != 0)
     {
-      printf("Error: %s\n", fzl_vm_geterror());
+      char *err = fzl_vm_geterror();
+      if (err && err[0])
+        printf("Error: %s\n", err);
+
+      free(args);
+      fzl_freevm(vm);
       return -1;
     }
   }