Update selected thread after loading mach core

The OS plugins might have updated the thread list after a core file has
been loaded. The physical thread in the core file may no longer be the
one that should be selected. Hence we should run the thread selection
logic after loading the core.

Differential revision: https://reviews.llvm.org/D44139

llvm-svn: 327501

3 files changed, 966 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/TestMachCore.py b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/TestMachCore.py
new file mode 100644
index 00000000000..ea981292157
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/TestMachCore.py
@@ -0,0 +1,68 @@
+"""
+Test basics of mach core file debugging.
+"""
+
+from __future__ import print_function
+
+import shutil
+import struct
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class MachCoreTestCase(TestBase):
+    NO_DEBUG_INFO_TESTCASE = True
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def setUp(self):
+        super(MachCoreTestCase, self).setUp()
+        self._initial_platform = lldb.DBG.GetSelectedPlatform()
+
+    def tearDown(self):
+        lldb.DBG.SetSelectedPlatform(self._initial_platform)
+        super(MachCoreTestCase, self).tearDown()
+
+    def test_selected_thread(self):
+        """Test that the right thread is selected after a core is loaded."""
+        # Create core form YAML.
+        self.yaml2obj("test.core.yaml", self.getBuildArtifact("test.core"))
+
+        # Set debugger into synchronous mode
+        self.dbg.SetAsync(False)
+
+        # Create a target by the debugger.
+        target = self.dbg.CreateTarget("")
+
+        # Load OS plugin.
+        python_os_plugin_path = os.path.join(self.getSourceDir(),
+                                             'operating_system.py')
+        command = "settings set target.process.python-os-plugin-path '{}'".format(
+            python_os_plugin_path)
+        self.dbg.HandleCommand(command)
+
+        # Load core.
+        process = target.LoadCore(self.getBuildArtifact("test.core"))
+        self.assertTrue(process, PROCESS_IS_VALID)
+        self.assertEqual(process.GetNumThreads(), 3)
+
+        # Verify our OS plug-in threads showed up
+        thread = process.GetThreadByID(0x111111111)
+        self.assertTrue(thread.IsValid(
+        ), "Make sure there is a thread 0x111111111 after we load the python OS plug-in"
+                        )
+        thread = process.GetThreadByID(0x222222222)
+        self.assertTrue(thread.IsValid(
+        ), "Make sure there is a thread 0x222222222 after we load the python OS plug-in"
+                        )
+        thread = process.GetThreadByID(0x333333333)
+        self.assertTrue(thread.IsValid(
+        ), "Make sure there is a thread 0x333333333 after we load the python OS plug-in"
+                        )
+
+        # Verify that the correct thread is selected
+        thread = process.GetSelectedThread()
+        self.assertEqual(thread.GetThreadID(), 0x333333333)
diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/operating_system.py b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/operating_system.py
new file mode 100644
index 00000000000..de6c3b7dd56
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/operating_system.py
@@ -0,0 +1,45 @@
+import lldb
+import struct
+
+
+class OperatingSystemPlugIn(object):
+    """Class that provides data for an instance of a LLDB 'OperatingSystemPython' plug-in class"""
+
+    def __init__(self, process):
+        '''Initialization needs a valid.SBProcess object.
+
+        This plug-in will get created after a live process is valid and has stopped for the first time.
+        '''
+        self.process = None
+        self.registers = None
+        self.threads = None
+        if isinstance(process, lldb.SBProcess) and process.IsValid():
+            self.process = process
+            self.threads = None  # Will be an dictionary containing info for each thread
+
+    def get_target(self):
+        return self.process.target
+
+    def get_thread_info(self):
+        if not self.threads:
+            self.threads = [{
+                'tid': 0x111111111,
+                'name': 'one',
+                'queue': 'queue1',
+                'state': 'stopped',
+                'stop_reason': 'none'
+            }, {
+                'tid': 0x222222222,
+                'name': 'two',
+                'queue': 'queue2',
+                'state': 'stopped',
+                'stop_reason': 'none'
+            }, {
+                'tid': 0x333333333,
+                'name': 'three',
+                'queue': 'queue3',
+                'state': 'stopped',
+                'stop_reason': 'sigstop',
+                'core': 0
+            }]
+        return self.threads
diff --git a/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/test.core.yaml b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/test.core.yaml
new file mode 100644
index 00000000000..84ce54e45e1
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/postmortem/mach-core/test.core.yaml
@@ -0,0 +1,853 @@
+--- !mach-o
+FileHeader:      
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+  sizeofcmds:      4384
+  flags:           0x00000000
+  reserved:        0x00000000
+LoadCommands:    
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+    cmdsize:         208
+    PayloadBytes:    
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