2 files changed, 11 insertions, 4 deletions
diff --git a/include/program.h b/include/program.h
index 543b38d..075bfca 100644
--- a/include/program.h
+++ b/include/program.h
@@ -30,6 +30,7 @@
 #define AMAL_PROGRAM_INVALID_EXTERNAL_FUNCTIONS_SIZE -18
 #define AMAL_PROGRAM_INSTRUCTION_INVALID_EXTERN_FUNC_INDEX -19
 #define AMAL_PROGRAM_NO_SUCH_EXTERNAL_FUNCTION -20
+#define AMAL_PROGRAM_EXTERN_FUNC_ALREADY_EXISTS -21
 
 #define AMAL_PROGRAM_MAGIC_NUMBER (u32)0xdec05eba
 #define AMAL_PROGRAM_MAJOR_VERSION 1
@@ -66,6 +67,10 @@ typedef struct {
 CHECK_RESULT int amal_program_init(amal_program *self);
 void amal_program_deinit(amal_program *self);
 
+/*
+    returns @AMAL_PROGRAM_EXTERN_FUNC_ALREADY_EXISTS if a function with the name @name already exists
+    in the program
+*/
 CHECK_RESULT int amal_program_add_extern_func(amal_program *self, BufferView name, void *func_ptr, int args_byte_size);
 
 CHECK_RESULT int amal_program_append_bytecode(amal_program *self, Bytecode *bytecode);
diff --git a/include/std/hash_map.h b/include/std/hash_map.h
index d789db4..c9e5b51 100644
--- a/include/std/hash_map.h
+++ b/include/std/hash_map.h
@@ -25,15 +25,17 @@ struct HashMap {
 
 CHECK_RESULT int hash_map_init(HashMap *self, ArenaAllocator *allocator, usize value_type_size, HashMapCompare key_compare_func, HashMapHash key_hash_func);
 /*
-Not thread-safe.
-Expected @value size to be @self->value_type_size.
+    Not thread-safe.
+    Expected @value size to be @self->value_type_size.
 */
 CHECK_RESULT int hash_map_insert(HashMap *self, BufferView key, void *value);
 /*
-Thread-safe unless @hash_map_insert is used in another thread at the same time.
-Expected @value size to be @self->value_type_size.
+    Thread-safe unless @hash_map_insert is used in another thread at the same time.
+    Expected @value size to be @self->value_type_size.
+    If @value is NULL, then the value is not copied and the functions works the same as @hash_map_contains
 */
 CHECK_RESULT bool hash_map_get(HashMap *self, BufferView key, void *value);
+CHECK_RESULT bool hash_map_contains(HashMap *self, BufferView key);
 
 int hash_map_compare_string(const void *a, const void *b);