implemented * pseudo-var, just truncate 16 bit values and don't compl…

…ain about overflow
landondyer · Nov 10, 2013 · 3e22cc3 · 3e22cc3
1 parent c063a6d
commit 3e22cc3
Show file tree

Hide file tree

Showing 3 changed files with 13 additions and 2 deletions.
diff --git a/eval.py b/eval.py
@@ -198,6 +198,10 @@ def parseTerm():
                 tokenizer.advance()
                 parseHelper( len(self.m_operators) - 1)
                 tokenizer.expect( ')' )
+            elif tokenizer.curTok() == '*':
+                self.m_postfix.append( self.doPushSym )
+                self.m_postfix.append( '*' )
+                tokenizer.nextTok()
             else:
                 raise Exception( str.format( "unexpected token {0}", tokenizer.curTok() ) )
 

diff --git a/kasm.py b/kasm.py
@@ -183,8 +183,6 @@ def fn_dw( tokenizer, phaseNumber ):
 
             value = expr.eval()
             if phaseNumber > 0:
-                if value > 0xffff or value < -32768:
-                    raise Exception( "value too large for a word" )
                 depositWord( value )
 
             else:
@@ -473,6 +471,11 @@ def assembleLine( line, phaseNumber=0 ):
     clearLineBytes()
     tokenizer = tok.Tokenizer( line )
 
+    #
+    #   Set '*' psuedo-symbol at the start of each line
+    #
+    symbols.set( '*', gLoc )
+
     #
     #   SYMBOL = VALUE
     #

diff --git a/test.asm b/test.asm
@@ -5,10 +5,14 @@ gMyGlobal   =   $40
 
         org     $200
 
+        dw      *
+        dw      *
+        dw      * + 0xffff
         db      1,2,3
 
         db      gronk
 
+
 gronk = 0xfe
 
         db      'this is a test\n'