Data flow improvements in pseudo code generator

tests/test_render_analysis.py

@@ -0,0 +1,59 @@
+import json
+import tempfile
+import unittest
+from pathlib import Path
+
+from h8536.dataflow import analyze_dataflow
+from h8536.model import Instruction
+from h8536.render import format_listing, write_json
+from h8536.rom import Rom
+from h8536.symbols import discover_symbols
+
+
+class RenderAnalysisIntegrationTest(unittest.TestCase):
+    def test_listing_and_json_include_symbols_and_compact_dataflow(self):
+        instructions = {
+            0x0100: Instruction(0x0100, b"\x58\x12\x34", "MOV:I.W", "#H'1234, R0"),
+            0x0103: Instruction(
+                0x0103,
+                b"\x1D\xF6\x80\x90",
+                "MOV:G.W",
+                "R0, @H'F680",
+                references=[0xF680],
+            ),
+        }
+        dataflow = analyze_dataflow(instructions)
+        symbols = discover_symbols(instructions)
+        rom = Rom(bytes([0xFF] * 0x200))
+
+        listing = format_listing(
+            Path("rom.bin"),
+            rom,
+            instructions,
+            {},
+            {},
+            "min",
+            traced=True,
+            dataflow=dataflow,
+            symbols=symbols,
+        )
+
+        self.assertIn("; Symbols", listing)
+        self.assertIn("ram_F680", listing)
+        self.assertIn("dataflow R0=H'1234", listing)
+
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "out.json"
+            write_json(path, instructions, {}, {}, dataflow=dataflow, symbols=symbols)
+            payload = json.loads(path.read_text(encoding="utf-8"))
+
+        self.assertEqual(payload["symbols"]["symbols"][0]["name"], "ram_F680")
+        self.assertEqual(payload["instructions"][1]["references"][0]["symbol"], "ram_F680")
+        dataflow_payload = payload["instructions"][0]["dataflow"]
+        self.assertEqual(dataflow_payload["changes"][0]["name"], "R0")
+        self.assertEqual(dataflow_payload["known_after"]["registers"]["R0"]["value"], 0x1234)
+        self.assertNotIn("before", dataflow_payload)
+
+
+if __name__ == "__main__":
+    unittest.main()