Add support for `char` type + string/char literals

This commit does a few things in one go:
- Add support for a `char` type + some changes to support the new size
- Add support for character literals. We need some escaping here to be
  able to use `\n` and `\0`, etc.
- Add support for string literals. These are all stored in the `.data`
  section. Fortunately NASM already handles the escape characters.
- Fix some bugs with code generation, specifically using `movsx` to sign
  extend the smaller types into 64-bit registers.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/types.h b/src/types.h
index 8bbf4e3..7aadd8d 100644
--- a/src/types.h
+++ b/src/types.h
@@ -5,7 +5,9 @@
 
 typedef enum {
     TYPE_NONE,
+    TYPE_ANY, // This is a hack for builtins till we can cast types
     TYPE_INT,
+    TYPE_CHAR,
     TYPE_PTR,
     TYPE_ARRAY,
 } DataType;
@@ -18,9 +20,11 @@ typedef struct data_type_node {
 
 Type *type_new(DataType type);
 i64 size_for_type(Type *type);
-bool type_equals(Type *a, Type *b);
 char *type_to_str(Type *type);
 
+bool type_equals(Type *a, Type *b);
+bool is_string_type(Type *type);
+
 // Type checking / casting expressions to right types
 typedef struct ast_node Node;