1 files changed, 64 insertions, 0 deletions
diff --git a/src/asm_pass4.py b/src/asm_pass4.py
new file mode 100644
index 0000000..96d9e65
--- /dev/null
+++ b/src/asm_pass4.py
@@ -0,0 +1,64 @@
+from dataclasses import dataclass
+from assembler_ops import *
+from assembler_eval import *
+from asm_pass3 import *
+
+@dataclass
+class Result4Line:
+  line_num: int
+  address: int
+  word: int
+  text: str
+
+@dataclass
+class Result4:
+  lines: list[Result4Line]
+  options: Options
+  operations: OpExpansionDict
+  labels: dict[str, int]
+
+def translate_opt(arg: str, options: Options) -> str:
+  match arg:
+    case "__STACK_POINTER": return options.stack_pointer
+    case "__CSR_SCRATCH": return options.csr_scratch
+    case _: return arg
+
+def pass_4(result3: Result3) -> Result4:
+  result_lines: list[Result4Line] = []
+  address = 0
+
+  for line in result3.lines:
+    keyword, *args = line.parts
+    meta = Meta(
+      address=address,
+    )
+
+    args = list(map(lambda a: translate_opt(a, result3.options), args))
+    text = " ".join([keyword, *args])
+
+    if keyword in operations:
+      fn = operations[keyword]
+      word = fn(meta, result3.labels, *args)
+      result_lines.append(Result4Line(
+        line_num=line.line_num,
+        address=line.address,
+        word=word,
+        text=text,
+      ))
+    else:
+      try:
+        result_lines.append(Result4Line(
+          line_num=line.line_num,
+          address=line.address,
+          word=eval_expr(result3.labels, keyword),
+          text=text,
+        ))
+      except:
+        raise Exception(f"Invalid assembly at {line.line_num + 1}\n\n{line}")
+
+  return Result4(
+    operations=result3.operations,
+    labels=result3.labels,
+    options=result3.options,
+    lines=result_lines,
+  )