From 43be44996c6531348142979c8110e7faf2b3d3d6 Mon Sep 17 00:00:00 2001
From: Rodrigo Gomez <rodrigo.gomez.p@utec.edu.pe>
Date: Mon, 9 Nov 2026 11:13:17 -0500
Subject: [PATCH] Fix paths with spaces in lit check updater

---
 scripts/update_lit_checks.py              | 33 +++++++++++++++-----
 test/unit/test_update_lit_checks_paths.py | 38 +++++++++++++++++++++++
 2 files changed, 63 insertions(+), 8 deletions(-)
 create mode 100755 test/unit/test_update_lit_checks_paths.py

diff --git a/scripts/update_lit_checks.py b/scripts/update_lit_checks.py
index 0e6801e663c..be81c277e16 100755
--- a/scripts/update_lit_checks.py
+++ b/scripts/update_lit_checks.py
@@ -23,6 +23,7 @@
 import glob
 import os
 import re
+import shlex
 import subprocess
 import sys
 import tempfile
@@ -109,15 +110,31 @@ def find_run_lines(test, lines):
 def run_command(args, test, tmp, command):
     env = dict(os.environ)
     env['PATH'] = args.binaryen_bin + os.pathsep + env['PATH']
-    command = command.replace('%s', test)
-    command = command.replace('%S', os.path.dirname(test))
-    command = command.replace('%t', tmp)
 
-    match = re.match(r'^(.*)\s*foreach\s+(\S+)\s+(\S+)\s+(.*)$', command)
+    def replace_paths(text):
+        return text.replace('%s', test).replace('%S', os.path.dirname(test)).replace('%t', tmp)
+
+    def quote_path(path):
+        return subprocess.list2cmdline([path]) if os.name == 'nt' else shlex.quote(path)
+
+    def replace_shell_paths(text):
+        def replace(match):
+            token = match.group()
+            if not any(path in token for path in ('%s', '%S', '%t')):
+                return token
+            if token[0] in {'"', "'"}:
+                token = token[1:-1]
+            return quote_path(replace_paths(token))
+
+        return re.sub(r'''"[^"]*"|'[^']*'|%[sSt]''', replace, text)
+
+    # Parse foreach arguments before expanding paths, which can contain spaces.
+    argument = r'''(?:"[^"]*"|'[^']*'|\S+)'''
+    match = re.match(r'^(.*)\s*foreach\s+(' + argument + r')\s+(' + argument + r')\s+(.*)$', command)
     if match:
         prefix = match.group(1)
-        infile = match.group(2)
-        tempfile = match.group(3)
+        infile = replace_paths(match.group(2).strip('\'"'))
+        tempfile = replace_paths(match.group(3).strip('\'"'))
         cmd_rest = match.group(4)
 
         outputs = []
@@ -125,14 +142,14 @@ def run_command(args, test, tmp, command):
             tempname = tempfile + '.' + str(i)
             with open(tempname, 'w') as temp:
                 print(module, file=temp)
-            new_command = prefix + ' ' + cmd_rest + ' ' + tempname
+            new_command = replace_shell_paths(prefix + ' ' + cmd_rest) + ' ' + quote_path(tempname)
             out = subprocess.check_output(new_command, shell=True, env=env).decode('utf-8')
             outputs.append(out)
 
         return f"\n{INTERNAL_SEPARATOR}\n".join(outputs)
     else:
         assert 'foreach' not in command, 'bad foreach matching: ' + command
-        return subprocess.check_output(command, shell=True, env=env).decode('utf-8')
+        return subprocess.check_output(replace_shell_paths(command), shell=True, env=env).decode('utf-8')
 
 
 def find_end(module, start):
diff --git a/test/unit/test_update_lit_checks_paths.py b/test/unit/test_update_lit_checks_paths.py
new file mode 100755
index 00000000000..a3b081792c9
--- /dev/null
+++ b/test/unit/test_update_lit_checks_paths.py
@@ -0,0 +1,38 @@
+import os
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+from scripts.test import shared
+
+from . import utils
+
+
+class UpdateLitChecksPathsTest(utils.BinaryenTestCase):
+    def test_paths_with_spaces(self):
+        with tempfile.TemporaryDirectory(prefix='update lit checks ') as temp:
+            root = Path(temp)
+            # Exercise %s, %S, and %t, with both quoted and unquoted RUN lines.
+            for run in (
+                'wasm-opt %s -S -o -',
+                'wasm-opt "%s" -S -o -',
+                'wasm-opt "%S/input file.wat" -S -o %t.wat && wasm-opt %t.wat -S -o -',
+                'foreach %s %t wasm-opt -S -o -',
+                'foreach "%s" "%t" wasm-opt -S -o -',
+            ):
+                with self.subTest(run=run):
+                    test = root / 'input file.wat'
+                    test.write_text(';; RUN: ' + run + ' | filecheck %s\n'
+                                    '(module\n'
+                                    ' (func $answer (result i32) (i32.const 42))\n'
+                                    ')\n')
+                    env = dict(os.environ, TMPDIR=temp, TEMP=temp, TMP=temp)
+                    command = [sys.executable,
+                               os.path.join(shared.options.binaryen_root, 'scripts', 'update_lit_checks.py'),
+                               '--binaryen-bin', shared.options.binaryen_bin,
+                               '--force', '--dry-run', str(test)]
+                    result = subprocess.run(command, env=env, capture_output=True, text=True)
+                    self.assertEqual(result.returncode, 0, result.stderr)
+                    self.assertIn(';; CHECK:', result.stdout)
+                    self.assertIn('(i32.const 42)', result.stdout)