Bugfix: Enforce label definitions

ZXBasm allowed global undefined labels as long as they
were not used. This is not allowed anymore.

Author: boriel

asmparse.py

@@ -471,12 +471,16 @@ def add_instruction(self, instr):
             self.__set_byte(byte, instr.lineno)
 
     def dump(self):
-        """ Returns a tuple containing code ORG, and a list of OUTPUT
+        """ Returns a tuple containing code ORG (origin address), and a list of bytes (OUTPUT)
         """
         org = min(self.memory_bytes.keys())  # Org is the lowest one
         OUTPUT = []
         align = []
 
+        for label in self.global_labels.values():
+            if not label.defined:
+                error(label.lineno, "Undefined GLOBAL label '%s'" % label.name)
+
         for i in range(org, max(self.memory_bytes.keys()) + 1):
             if gl.has_errors:
                 return org, OUTPUT
@@ -1495,7 +1499,7 @@ def generate_binary(outputfname, format_, progname='', binary_files=None, headle
         import basic  # Minimalist basic tokenizer
 
         program = basic.Basic()
-        if org > 16383:  # Only for zx48k: CLEAR if below 16383
+        if org > 16383:  # Only for zx48k: CLEAR if above 16383
             program.add_line([['CLEAR', org - 1]])
         program.add_line([['LOAD', '""', program.token('CODE')]])
 

tests/functional/prepro35.asm

@@ -32,6 +32,7 @@ __CALL_BACK__:
 	DEFW 0
 	
 ZXBASIC_USER_DATA:
+ZXBASIC_MEM_HEAP:
 	; Defines DATA END --> HEAP size is 0
 ZXBASIC_USER_DATA_END EQU ZXBASIC_MEM_HEAP
 	; Defines USER DATA Length in bytes

tests/functional/undef_label.asm

@@ -0,0 +1,4 @@
+
+LABEL1 EQU LABEL2 + 1
+
+

zxbasm.py

@@ -24,7 +24,7 @@
 from api import global_
 
 # Release version
-VERSION = '1.13.0'
+VERSION = '1.13.1'
 
 
 def main(args=None):