From 9a6001ad380e83a545188b58145387593b117b48 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Mon, 10 Apr 2023 21:10:16 +0300
Subject: Refactor into multipass compiler

---
 src/assembler.py | 94 ++++++++++----------------------------------------------
 1 file changed, 16 insertions(+), 78 deletions(-)

(limited to 'src/assembler.py')

diff --git a/src/assembler.py b/src/assembler.py
index a4ddde4..fc7bc45 100755
--- a/src/assembler.py
+++ b/src/assembler.py
@@ -2,10 +2,12 @@
 # Assemble ATK16 assembly to bytecode
 
 import sys
-from typing import Callable
-import importlib
 from assembler_ops import *
 from assembler_eval import *
+from asm_pass1 import pass_1
+from asm_pass2 import pass_2
+from asm_pass3 import pass_3
+from asm_pass4 import pass_4
 
 if len(sys.argv) != 3:
   print("usage: assembler.py <infile> <outfile> # read from file")
@@ -47,91 +49,27 @@ def parse(line: str) -> list[str]:
   result.append(acc)
   return list(filter(lambda x: len(x) > 0, result))
 
-# 1st pass, gather labels, set options, eval operations
-options = Options()
-address: int = 0
+result1 = pass_1(src_lines)
+result2 = pass_2(result1)
+result3 = pass_3(result2)
+result4 = pass_4(result3)
 
-for (lineNo, line) in enumerate(src_lines):
-  line = line.split(";")[0].strip()
-  if line == "": continue
-  keyword, *args = line.lower().split()
-  match keyword:
-    case "@address":
-      address = eval(args[0])
-      continue
-    case "@label":
-      labels[args[0]] = address
-      # todo bugi: 1st pass ei ota monirivisiä käskyjä huomioon
-      continue
-    case "@opt":
-      opt_name, opt_value = args
-      match opt_name:
-        case "stack_pointer": options.stack_pointer = opt_value
-        case "csr_scratch": options.csr_scratch = opt_value
-        case _: raise Exception("Unknown @opt: " + opt_name)
-    case "@use":
-      module_name, ops = args[0].split(":")
-      ops_split = ops.split(",")
-      module = importlib.import_module(module_name)
-      mod_operations: dict[str, Callable[..., list[int]]] = module.operations
-      for op in mod_operations:
-        callable = mod_operations[op]
-        if ops == "*" or op in ops_split:
-            operations[op] = callable
-    case _:
-      pass
-
-  address += 1
-
-# 2nd pass
-
-address: int = 0
 nop = bytearray([0b1000_0000, 0])
 result = bytearray()
 # initially one nop
 result.extend(nop)
 
-for (lineNo, line) in enumerate(src_lines):
-  line = line.split(";")[0].strip()
-  if line == "": continue
-  keyword, *args = parse(line.lower())
-
-  meta = Meta(
-    address=address,
-    options=options
-  )
-  if keyword in operations:
-    words = operations[keyword](meta, *args)
-  else:
-    match keyword:
-      # Directives
-      case "@address":
-        address = eval_expr(args[0])
-        continue
-      case "@label" | "@opt" | "@use":
-        continue
-
-      # Default case: evaluate as is (e.g. data word)
-      case _:
-        try:
-          words = [eval_expr(keyword)]
-        except:
-          raise Exception(f"Invalid assembly at {infile_path}:{lineNo + 1}\n\n{line}")
-
-  for (label, label_addr) in labels.items():
-    if address == label_addr:
+for line in result4.lines:
+  for (label, label_addr) in result4.labels.items():
+    if line.address == label_addr:
       print(f"{label}:")
 
-  line_printed = False
-  for word in words:
-    if len(result) < 2 * address + 1:
-      result.extend((2 * address + 1 - len(result)) * nop)
+  if len(result) < 2 * line.address + 1:
+    result.extend((2 * line.address + 1 - len(result)) * nop)
 
-    print(f"{address:>08x}  0x{word:>04x}  {line if not line_printed else '...'}")
-    result[2 * address + 0] = ((word >> 8) & 0xff)
-    result[2 * address + 1] = ((word >> 0) & 0xff)
-    address += 1
-    line_printed = True
+  print(f"{line.address:>08x}  0x{line.word:>04x}  {line.text}")
+  result[2 * line.address + 0] = ((line.word >> 8) & 0xff)
+  result[2 * line.address + 1] = ((line.word >> 0) & 0xff)
 
 with open(outfile_path, "wb") as f:
   f.write(result)
-- 
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