Feature/headerless

arch/zx48k/backend/__init__.py

@@ -201,6 +201,8 @@ def init():
     OPTIONS.add_option('heap_start_label', str, 'ZXBASIC_MEM_HEAP')
     # Labels for HEAP SIZE (might not be used if not needed)
     OPTIONS.add_option('heap_size_label', str, 'ZXBASIC_HEAP_SIZE')
+    # Flag for headerless mode (No prologue / epilogue)
+    OPTIONS.add_option('headerless', bool, False)
 
 
 def new_ASMID():
@@ -402,6 +404,9 @@ def _end(ins):
     FLAG_end_emitted = True
 
     output.append('%s:' % END_LABEL)
+    if OPTIONS.headerless.value:
+        return output + ['ret']
+
     output.append('di')
     output.append('ld hl, (%s)' % CALL_BACK)
     output.append('ld sp, hl')
@@ -2164,7 +2169,9 @@ def __str__(self):
 # Program Start routine
 # -------------------------
 def emit_start():
-    output = []
+    output = list()
+    if OPTIONS.headerless.value:
+        return output
 
     output.append('org %s' % OPTIONS.org.value)
 

tests/functional/headerless.asm

@@ -0,0 +1,17 @@
+	ld a, (_a)
+	inc a
+	ld (_a), a
+	ld hl, 0
+	ld b, h
+	ld c, l
+__END_PROGRAM:
+	ret
+
+ZXBASIC_USER_DATA:
+_a:
+	DEFB 02h
+	; Defines DATA END --> HEAP size is 0
+ZXBASIC_USER_DATA_END EQU ZXBASIC_MEM_HEAP
+	; Defines USER DATA Length in bytes
+ZXBASIC_USER_DATA_LEN EQU ZXBASIC_USER_DATA_END - ZXBASIC_USER_DATA
+	END

tests/functional/headerless.bas

@@ -0,0 +1,6 @@
+REM a headerless (no prologuqe in ASM) program
+#pragma headerless=true
+
+DIM a as UByte = 2
+LET a = a + 1
+

zxb.py

@@ -141,6 +141,8 @@ def main(args=None):
                         help='Add colon separated list of directories to add to include path. e.g. -I dir1:dir2')
     parser.add_argument('--strict', action='store_true',
                         help='Enables strict mode. Force explicit type declaration')
+    parser.add_argument('--headerless', action='store_true',
+                        help='Header-less mode: omit asm prologue and epilogue')
     parser.add_argument('--version', action='version', version='%(prog)s {0}'.format(VERSION))
 
     options = parser.parse_args(args=args)
@@ -166,6 +168,7 @@ def main(args=None):
     OPTIONS.explicit.value = options.explicit
     OPTIONS.memory_map.value = options.memory_map
     OPTIONS.strict.value = options.strict
+    OPTIONS.headerless.value = options.headerless
 
     if options.defines:
         for i in options.defines: