mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
c2b9d467e5
Admit post-EXE RAM to the dirty interpreter only after a real control transfer and an existing MIPS decodability check. Keep the already-merged overlay initialization guard out of this focused change. Co-authored-by: Martin Penkava <mpenkava1337@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
#!/usr/bin/env python3
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"""Structural regression test for unmarked post-EXE code discovery."""
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from pathlib import Path
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import re
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import sys
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ROOT = Path(__file__).resolve().parents[2]
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SOURCE = ROOT / "runtime" / "src" / "dirty_ram_interp.c"
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def function_body(source: str, name: str) -> str:
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match = re.search(rf"\bstatic\s+int\s+{re.escape(name)}\s*\([^;]*?\)\s*\{{", source, re.S)
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if not match:
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raise AssertionError(f"missing function definition: {name}")
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start = match.end()
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depth = 1
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for pos in range(start, len(source)):
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if source[pos] == "{":
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depth += 1
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elif source[pos] == "}":
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depth -= 1
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if depth == 0:
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return source[start:pos]
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raise AssertionError(f"unterminated function definition: {name}")
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def main() -> int:
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source = SOURCE.read_text(encoding="utf-8")
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body = function_body(source, "dirty_ram_dispatch_inner")
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dirty_gate = body.find("!dirty_ram_is_dirty(phys) && !clean_game_text_miss")
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floor_gate = body.find("phys >= g_overlay_region_floor", dirty_gate)
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ram_gate = body.find("phys < (2u * 1024u * 1024u)", dirty_gate)
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decode_gate = body.find("dirty_ram_word_looks_decodable(fetch_word(phys))", dirty_gate)
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mark = body.find("dirty_ram_mark_executable_range(phys, 4u)", dirty_gate)
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if min(dirty_gate, floor_gate, ram_gate, decode_gate, mark) < 0:
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raise AssertionError("missing dirty/floor/RAM/decode/mark fallback chain")
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if not (dirty_gate < floor_gate < decode_gate < mark and dirty_gate < ram_gate < mark):
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raise AssertionError("fallback checks or executable marking are out of order")
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fallback = body[dirty_gate:mark + 200]
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if "else {\n return 0;" not in fallback:
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raise AssertionError("invalid/data targets do not fail closed")
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print("PASS: decodable post-EXE dispatch fallback is guarded and fail-closed")
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return 0
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if __name__ == "__main__":
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try:
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sys.exit(main())
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except AssertionError as exc:
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print(f"FAIL: {exc}")
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sys.exit(1)
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