[llvm] [CI] Use action from FAILED: in ninja log parser (PR #166100)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/166100

There are cases where the progress indicator does not align at all with
the action printed in FAILED:. Default to just using the action there so
that we can ensure the results are accurate. This still leaves some
issues where we are not capturing all the log lines, but I'll look at
those in a future crash. Those are also less critical since they do not
cause the script to crash.

Partially fixes #165131.


>From 34b264d1ab4a95a3826ba9294c9c43e2d87fdd2a Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Sun, 2 Nov 2025 21:17:49 +0000
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.7
---
 .ci/generate_test_report_lib.py      | 11 +++++---
 .ci/generate_test_report_lib_test.py | 42 +++++++++++++++++++++++-----
 2 files changed, 42 insertions(+), 11 deletions(-)

diff --git a/.ci/generate_test_report_lib.py b/.ci/generate_test_report_lib.py
index 36c95852452ac..d5fe437155a83 100644
--- a/.ci/generate_test_report_lib.py
+++ b/.ci/generate_test_report_lib.py
@@ -41,10 +41,13 @@ def _parse_ninja_log(ninja_log: list[str]) -> list[tuple[str, str]]:
         # touch test/4.stamp
         #
         # index will point to the line that starts with Failed:. The progress
-        # indicator is the line before this ([4/5] test/4.stamp) and contains a pretty
-        # printed version of the target being built (test/4.stamp). We use this line
-        # and remove the progress information to get a succinct name for the target.
-        failing_action = ninja_log[index - 1].split("] ")[1]
+        # indicator is sometimes the line before this ([4/5] test/4.stamp) and
+        # will contain a pretty printed version of the target being built
+        # (test/4.stamp) when accurate. We instead parse the failed line rather
+        # than the progress indicator as the progress indicator may not be
+        # aligned with the failure.
+        failing_action = ninja_log[index].split("FAILED: ")[1]
+        print(failing_action)
         failure_log = []
         while (
             index < len(ninja_log)
diff --git a/.ci/generate_test_report_lib_test.py b/.ci/generate_test_report_lib_test.py
index a8659e1d6a3e3..a8991f139e055 100644
--- a/.ci/generate_test_report_lib_test.py
+++ b/.ci/generate_test_report_lib_test.py
@@ -39,7 +39,7 @@ def test_find_failure_ninja_logs(self):
         self.assertEqual(
             failures[0],
             (
-                "test/4.stamp",
+                "touch test/4.stamp",
                 dedent(
                     """\
                     FAILED: touch test/4.stamp
@@ -77,7 +77,7 @@ def test_ninja_log_end(self):
         self.assertEqual(
             failures[0],
             (
-                "test/3.stamp",
+                "touch test/3.stamp",
                 dedent(
                     """\
                     FAILED: touch test/3.stamp
@@ -106,7 +106,7 @@ def test_ninja_log_multiple_failures(self):
         self.assertEqual(
             failures[0],
             (
-                "test/2.stamp",
+                "touch test/2.stamp",
                 dedent(
                     """\
                     FAILED: touch test/2.stamp
@@ -117,7 +117,7 @@ def test_ninja_log_multiple_failures(self):
         self.assertEqual(
             failures[1],
             (
-                "test/4.stamp",
+                "touch test/4.stamp",
                 dedent(
                     """\
                     FAILED: touch test/4.stamp
@@ -150,7 +150,7 @@ def test_ninja_log_runtimes_failure(self):
         self.assertEqual(
             failures[0],
             (
-                "test/2.stamp",
+                "touch test/2.stamp",
                 dedent(
                     """\
                     FAILED: touch test/2.stamp
@@ -159,6 +159,34 @@ def test_ninja_log_runtimes_failure(self):
             ),
         )
 
+    # Test that we correctly handle cases where the FAILED: line does not
+    # match up with the progress indicator.
+    def test_ninja_log_mismatched_failed(self):
+        failures = generate_test_report_lib.find_failure_in_ninja_logs(
+            [
+                [
+                    "[1/5] test/1.stamp",
+                    "[2/5] test/2.stamp",
+                    "ModuleNotFoundError: No module named 'mount_langley'",
+                    "FAILED: tools/check-langley",
+                    "Wow! This system is really broken!",
+                    "[5/5] test/5.stamp",
+                ]
+            ]
+        )
+        self.assertEqual(len(failures), 1)
+        self.assertEqual(
+            failures[0],
+            (
+                "tools/check-langley",
+                dedent(
+                    """\
+                    FAILED: tools/check-langley
+                    Wow! This system is really broken!"""
+                ),
+            ),
+        )
+
     def test_title_only(self):
         self.assertEqual(
             generate_test_report_lib.generate_report("Foo", 0, [], []),
@@ -449,7 +477,7 @@ def test_no_failures_multiple_build_failed_ninja_log(self):
                     All tests passed but another part of the build **failed**. Click on a failure below to see the details.
 
                     <details>
-                    <summary>test/2.stamp</summary>
+                    <summary>touch test/2.stamp</summary>
 
                     ```
                     FAILED: touch test/2.stamp
@@ -457,7 +485,7 @@ def test_no_failures_multiple_build_failed_ninja_log(self):
                     ```
                     </details>
                     <details>
-                    <summary>test/4.stamp</summary>
+                    <summary>touch test/4.stamp</summary>
 
                     ```
                     FAILED: touch test/4.stamp