fix: ensure paths are normalised in Puya source maps

src/puya/compile.py

@@ -41,7 +41,7 @@
 from puya.teal.models import TealProgram, TealSubroutine
 from puya.teal.output import emit_teal
 from puya.ussemble.main import assemble_program
-from puya.utils import attrs_extend, make_path_relative_to_cwd
+from puya.utils import attrs_extend, make_path_relative_to, make_path_relative_to_cwd
 
 logger = log.get_logger(__name__)
 
@@ -334,19 +334,15 @@ def _write_artifacts(
 def _debug_info_as_json(info: DebugInfo, base_path: Path) -> bytes:
     # make sources relative to output
     info = attrs.evolve(
-        info, sources=[str(_try_make_relative_to(Path(s), base_path)) for s in info.sources]
+        info,
+        sources=[
+            make_path_relative_to(path=Path(s), to=base_path, walk_up=True) for s in info.sources
+        ],
     )
     json = _debug_info_converter.dumps(info, DebugInfo, indent=2)
     return json.encode("utf-8")
 
 
-def _try_make_relative_to(path: Path, relative_to: Path) -> Path:
-    try:
-        return path.relative_to(relative_to, walk_up=True)
-    except ValueError:
-        return path
-
-
 def _write_output(base_path: Path, programs: dict[str, bytes | None]) -> None:
     for suffix, program in programs.items():
         output_path = base_path.with_suffix(suffix)

src/puya/ussemble/debug.py

@@ -4,6 +4,7 @@
 from puya.parse import SourceLocation
 from puya.ussemble import models
 from puya.ussemble.context import AssembleContext
+from puya.utils import normalize_path
 
 
 def build_debug_info(
@@ -28,7 +29,7 @@ def build_debug_info(
         pc - pc_offset: node.source_location for pc, node in pc_ops.items() if pc >= pc_offset
     }
 
-    files = sorted(map(str, {s.file for s in source_map.values() if s and s.file}))
+    files = sorted(map(normalize_path, {s.file for s in source_map.values() if s and s.file}))
     mappings = _get_src_mappings(source_map, files)
 
     return DebugInfo(
@@ -53,7 +54,7 @@ def _get_src_mappings(
         if not loc or not loc.file:
             mappings.append("")
             continue
-        source_index = files.index(str(loc.file))
+        source_index = files.index(normalize_path(loc.file))
         line = loc.line - 1  # make 0-indexed
         column = loc.column or 0
 

src/puya/utils.py

@@ -138,14 +138,14 @@ def attrs_extend[
 
 
 @functools.cache
-def _make_path_relative(*, to: Path, path: Path) -> str:
+def make_path_relative_to(*, to: Path, path: Path, walk_up: bool = False) -> str:
     with contextlib.suppress(ValueError):
-        path = path.relative_to(to)
-    return str(path).replace(os.sep, "/")
+        path = path.relative_to(to, walk_up=walk_up)
+    return normalize_path(path)
 
 
 def make_path_relative_to_cwd(path: Path) -> str:
-    return _make_path_relative(to=Path.cwd(), path=path)
+    return make_path_relative_to(to=Path.cwd(), path=path)
 
 
 def unique[T](items: Iterable[T]) -> list[T]:
@@ -324,3 +324,7 @@ def set_remove[T](set_: MutableSet[T], value: T) -> bool:
     removed = value in set_
     set_.discard(value)
     return removed
+
+
+def normalize_path(path: Path) -> str:
+    return str(path).replace(os.sep, "/")