[dotest] Make --test-subdir work with --no-multiprocess

The single-process test runner is invoked in a number of different
scenarios, including when multiple test dirs are specified or (afaict)
when lit is used to drive the test suite.

Unfortunately the --test-subdir option did not work with the single
process test runner, breaking an important use case (using lit to run
swift-lldb Linux tests):

  Failure URL: https://ci.swift.org/job/swift-PR-Linux/6841

We won't be able to run lldb tests within swift PR testing without
filtering down the set of tests.

This change makes --test-subdir work with the single-process runner.

llvm-svn: 339929

1 files changed, 36 insertions, 1 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/configuration.py b/lldb/packages/Python/lldbsuite/test/configuration.py
index 9478105..a1a0ced 100644
--- a/lldb/packages/Python/lldbsuite/test/configuration.py
+++ b/lldb/packages/Python/lldbsuite/test/configuration.py
@@ -110,9 +110,13 @@ lldb_platform_working_dir = None
 # The base directory in which the tests are being built.
 test_build_dir = None
 
+# The only directory to scan for tests. If multiple test directories are
+# specified, and an exclusive test subdirectory is specified, the latter option
+# takes precedence.
+exclusive_test_subdir = None
+
 # Parallel execution settings
 is_inferior_test_runner = False
-multiprocess_test_subdir = None
 num_threads = None
 no_multiprocess_test_runner = False
 test_runner_name = None
@@ -144,3 +148,34 @@ def shouldSkipBecauseOfCategories(test_categories):
             return True
 
     return False
+
+
+def get_absolute_path_to_exclusive_test_subdir():
+    """
+    If an exclusive test subdirectory is specified, return its absolute path.
+    Otherwise return None.
+    """
+    test_directory = os.path.dirname(os.path.realpath(__file__))
+
+    if not exclusive_test_subdir:
+        return
+
+    if len(exclusive_test_subdir) > 0:
+        test_subdir = os.path.join(test_directory, exclusive_test_subdir)
+        if os.path.isdir(test_subdir):
+            return test_subdir
+
+        print('specified test subdirectory {} is not a valid directory\n'
+                .format(test_subdir))
+
+
+def get_absolute_path_to_root_test_dir():
+    """
+    If an exclusive test subdirectory is specified, return its absolute path.
+    Otherwise, return the absolute path of the root test directory.
+    """
+    test_subdir = get_absolute_path_to_exclusive_test_subdir()
+    if test_subdir:
+        return test_subdir
+
+    return os.path.dirname(os.path.realpath(__file__))