Started work on preprocessing jump addresses

asm/lexer.c

@@ -24,6 +24,8 @@ const char *token_type_as_cstr(token_type_t type)
 {
   switch (type)
   {
+  case TOKEN_STAR:
+    return "STAR";
   case TOKEN_LITERAL_NUMBER:
     return "LITERAL_NUMBER";
   case TOKEN_LITERAL_CHAR:
@@ -124,7 +126,7 @@ char uppercase(char c)
 
 bool is_symbol(char c)
 {
-  return isalpha(c) || c == '-' || c == '_' || c == '.';
+  return isalpha(c) || c == '-' || c == '_' || c == '.' || c == ':';
 }
 
 bool is_valid_hex_char(char c)
@@ -431,6 +433,15 @@ lerr_t tokenise_buffer(buffer_t *buffer, token_stream_t *tokens_ptr)
       ++buffer->used;
       is_token = false;
     }
+    else if (c == '*')
+    {
+      t        = (token_t){.type     = TOKEN_STAR,
+                           .column   = column,
+                           .str      = malloc(1),
+                           .str_size = 1};
+      t.str[0] = '\0';
+      ++buffer->used;
+    }
     else if (isdigit(c) || (space_left(buffer) > 1 && c == '-' &&
                             isdigit(buffer->data[buffer->used + 1])))
       t = tokenise_number_literal(buffer, &column);

asm/lexer.h

@@ -17,6 +17,7 @@
 
 typedef enum TokenType
 {
+  TOKEN_STAR,
   TOKEN_LITERAL_NUMBER,
   TOKEN_LITERAL_CHAR,
   TOKEN_NOOP,

todo.org

@@ -2,14 +2,14 @@
 #+author: Aryadev Chavali
 #+date: 2023-11-02
 
-* TODO Write a label/jump system :ASM:
+* WIP Write a label/jump system :ASM:
 Essentially a user should be able to write arbitrary labels (maybe
 through ~label x~ or ~x:~ syntax) which can be referred to by ~jump~.
 
 It'll purely be on the assembler side as a processing step, where the
 emitted bytecode purely refers to absolute addresses; the VM should
 just be dealing with absolute addresses here.
-* TODO Allow relative addresses in jumps :ASM:
+* WIP Allow relative addresses in jumps :ASM:
 As requested, a special syntax for relative address jumps.  Sometimes
 it's a bit nicer than a label.
 * TODO Calling and returning control flow :VM: :ASM: