[Lldb-commits] [lldb] 954d042 - Revert "[lldb/Target] Add Assert StackFrame Recognizer"

Med Ismail Bennani via lldb-commits lldb-commits at lists.llvm.org
Tue Jan 28 09:41:09 PST 2020


Author: Med Ismail Bennani
Date: 2020-01-28T18:40:08+01:00
New Revision: 954d04295b9b5447139cb1b9b57b9a2a4dd9b656

URL: https://github.com/llvm/llvm-project/commit/954d04295b9b5447139cb1b9b57b9a2a4dd9b656
DIFF: https://github.com/llvm/llvm-project/commit/954d04295b9b5447139cb1b9b57b9a2a4dd9b656.diff

LOG: Revert "[lldb/Target] Add Assert StackFrame Recognizer"

This reverts commit 03a6b858fde5c644ec16b1fddd8e10aa9ef3f0ad.

The test doesn't pass on Debian.

Added: 
    

Modified: 
    lldb/docs/use/formatting.rst
    lldb/include/lldb/Core/FormatEntity.h
    lldb/include/lldb/Target/StackFrameRecognizer.h
    lldb/include/lldb/Target/Thread.h
    lldb/packages/Python/lldbsuite/test/functionalities/inferior-assert/TestInferiorAssert.py
    lldb/packages/Python/lldbsuite/test/lang/objc/exceptions/TestObjCExceptions.py
    lldb/source/API/SBThread.cpp
    lldb/source/Core/FormatEntity.cpp
    lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
    lldb/source/Target/CMakeLists.txt
    lldb/source/Target/Process.cpp
    lldb/source/Target/StackFrameRecognizer.cpp
    lldb/source/Target/Thread.cpp

Removed: 
    lldb/include/lldb/Target/AssertFrameRecognizer.h
    lldb/source/Target/AssertFrameRecognizer.cpp
    lldb/test/Shell/Recognizer/Inputs/assert.c
    lldb/test/Shell/Recognizer/assert.test


################################################################################
diff  --git a/lldb/docs/use/formatting.rst b/lldb/docs/use/formatting.rst
index e2644d50217b..939c4e18f749 100644
--- a/lldb/docs/use/formatting.rst
+++ b/lldb/docs/use/formatting.rst
@@ -134,9 +134,7 @@ A complete list of currently supported format string variables is listed below:
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``thread.queue``                                  | The queue name of the thread if the target OS supports dispatch queues                                                                                                                                                                                                                      |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| ``thread.stop-reason``                            | A textual reason why the thread stopped. If the thread have a recognized frame, this displays its recognized stop reason. Otherwise, gets the stop info description.                                                                                                                        |
-+---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| ``thread.stop-reason-raw``                        | A textual reason why the thread stopped. Always returns stop info description.                                                                                                                                                                                                              |
+| ``thread.stop-reason``                            | A textual reason each thread stopped                                                                                                                                                                                                                                                        |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``thread.return-value``                           | The return value of the latest step operation (currently only for step-out.)                                                                                                                                                                                                                |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

diff  --git a/lldb/include/lldb/Core/FormatEntity.h b/lldb/include/lldb/Core/FormatEntity.h
index 106b0706ebf9..8ee320b0ebb1 100644
--- a/lldb/include/lldb/Core/FormatEntity.h
+++ b/lldb/include/lldb/Core/FormatEntity.h
@@ -61,7 +61,6 @@ class FormatEntity {
       ThreadName,
       ThreadQueue,
       ThreadStopReason,
-      ThreadStopReasonRaw,
       ThreadReturnValue,
       ThreadCompletedExpression,
       ScriptThread,

diff  --git a/lldb/include/lldb/Target/AssertFrameRecognizer.h b/lldb/include/lldb/Target/AssertFrameRecognizer.h
deleted file mode 100644
index 4acfefa9edfb..000000000000
--- a/lldb/include/lldb/Target/AssertFrameRecognizer.h
+++ /dev/null
@@ -1,55 +0,0 @@
-//===-- AssertFrameRecognizer.cpp -------------------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef liblldb_AssertFrameRecognizer_h_
-#define liblldb_AssertFrameRecognizer_h_
-
-#include "lldb/Target/Process.h"
-#include "lldb/Target/StackFrameRecognizer.h"
-#include "lldb/Utility/ConstString.h"
-#include "lldb/Utility/FileSpec.h"
-
-#include <tuple>
-
-namespace lldb_private {
-
-/// Registers the assert stack frame recognizer.
-///
-/// \param[in] process
-///    The process that is currently asserting. This will give us information on
-///    the target and the platform.
-void RegisterAssertFrameRecognizer(Process *process);
-
-/// \class AssertRecognizedStackFrame
-///
-/// Holds the stack frame where the assert is called from.
-class AssertRecognizedStackFrame : public RecognizedStackFrame {
-public:
-  AssertRecognizedStackFrame(lldb::StackFrameSP most_relevant_frame_sp);
-  lldb::StackFrameSP GetMostRelevantFrame() override;
-  llvm::StringRef GetStopDescription() override;
-
-private:
-  lldb::StackFrameSP m_most_relevant_frame;
-};
-
-/// \class AssertFrameRecognizer
-///
-/// When a thread stops, it checks depending on the platform if the top frame is
-/// an abort stack frame. If so, it looks for an assert stack frame in the upper
-/// frames and set it as the most relavant frame when found.
-class AssertFrameRecognizer : public StackFrameRecognizer {
-public:
-  std::string GetName() override { return "Assert StackFrame Recognizer"; }
-  lldb::RecognizedStackFrameSP
-  RecognizeFrame(lldb::StackFrameSP frame_sp) override;
-};
-
-} // namespace lldb_private
-
-#endif // liblldb_AssertFrameRecognizer_h_

diff  --git a/lldb/include/lldb/Target/StackFrameRecognizer.h b/lldb/include/lldb/Target/StackFrameRecognizer.h
index 59febd5c1f4e..2021ac5215f3 100644
--- a/lldb/include/lldb/Target/StackFrameRecognizer.h
+++ b/lldb/include/lldb/Target/StackFrameRecognizer.h
@@ -12,7 +12,6 @@
 #include "lldb/Core/ValueObject.h"
 #include "lldb/Core/ValueObjectList.h"
 #include "lldb/Symbol/VariableList.h"
-#include "lldb/Target/StopInfo.h"
 #include "lldb/Utility/StructuredData.h"
 #include "lldb/lldb-private-forward.h"
 #include "lldb/lldb-public.h"
@@ -34,8 +33,6 @@ class RecognizedStackFrame
   virtual lldb::ValueObjectSP GetExceptionObject() {
     return lldb::ValueObjectSP();
   }
-  virtual lldb::StackFrameSP GetMostRelevantFrame() { return nullptr; };
-  virtual llvm::StringRef GetStopDescription() { return ""; }
   virtual ~RecognizedStackFrame(){};
 
 protected:

diff  --git a/lldb/include/lldb/Target/Thread.h b/lldb/include/lldb/Target/Thread.h
index 1a24e2c2fc6c..cdc8d39251c6 100644
--- a/lldb/include/lldb/Target/Thread.h
+++ b/lldb/include/lldb/Target/Thread.h
@@ -216,12 +216,6 @@ class Thread : public std::enable_shared_from_this<Thread>,
 
   virtual void RefreshStateAfterStop() = 0;
 
-  void SelectMostRelevantFrame();
-
-  llvm::StringRef GetStopDescription();
-
-  llvm::StringRef GetStopDescriptionRaw();
-
   void WillStop();
 
   bool ShouldStop(Event *event_ptr);

diff  --git a/lldb/packages/Python/lldbsuite/test/functionalities/inferior-assert/TestInferiorAssert.py b/lldb/packages/Python/lldbsuite/test/functionalities/inferior-assert/TestInferiorAssert.py
index ab81bde771d1..36fdc8622948 100644
--- a/lldb/packages/Python/lldbsuite/test/functionalities/inferior-assert/TestInferiorAssert.py
+++ b/lldb/packages/Python/lldbsuite/test/functionalities/inferior-assert/TestInferiorAssert.py
@@ -104,13 +104,12 @@ def set_breakpoint(self, line):
     def check_stop_reason(self):
         matched = lldbplatformutil.match_android_device(
             self.getArchitecture(), valid_api_levels=list(range(1, 16 + 1)))
-
-        target = self.dbg.GetTargetAtIndex(0)
-        process = target.GetProcess()
-
-        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
-
-        stop_reason = 'stop reason = ' + thread.GetStopDescription(256)
+        if matched:
+            # On android until API-16 the abort() call ended in a sigsegv
+            # instead of in a sigabrt
+            stop_reason = 'stop reason = signal SIGSEGV'
+        else:
+            stop_reason = 'stop reason = signal SIGABRT'
 
         # The stop reason of the thread should be an abort signal or exception.
         self.expect("thread list", STOPPED_DUE_TO_ASSERT,
@@ -174,22 +173,6 @@ def inferior_asserting_registers(self):
         self.runCmd("run", RUN_SUCCEEDED)
         self.check_stop_reason()
 
-        # change current frame to frame 0, since recognizer might have selected
-        # 
diff erent frame.
-        target = self.dbg.GetTargetAtIndex(0)
-        self.assertTrue(target, VALID_TARGET)
-
-        process = target.GetProcess()
-        self.assertTrue(process.IsValid(), "current process is valid")
-
-        thread = process.GetSelectedThread()
-        self.assertTrue(thread.IsValid(), "current thread is valid")
-
-        thread.SetSelectedFrame(0)
-        frame = thread.GetSelectedFrame()
-
-        self.assertTrue(thread.GetFrameAtIndex(0) == frame, "Frame #0 selected")
-
         # lldb should be able to read from registers from the inferior after
         # asserting.
         lldbplatformutil.check_first_register_readable(self)

diff  --git a/lldb/packages/Python/lldbsuite/test/lang/objc/exceptions/TestObjCExceptions.py b/lldb/packages/Python/lldbsuite/test/lang/objc/exceptions/TestObjCExceptions.py
index f7d18e626e01..ce9ee8e027ff 100644
--- a/lldb/packages/Python/lldbsuite/test/lang/objc/exceptions/TestObjCExceptions.py
+++ b/lldb/packages/Python/lldbsuite/test/lang/objc/exceptions/TestObjCExceptions.py
@@ -25,8 +25,8 @@ def test_objc_exceptions_at_throw(self):
         launch_info = lldb.SBLaunchInfo(["a.out", "0"])
         lldbutil.run_to_name_breakpoint(self, "objc_exception_throw", launch_info=launch_info)
 
-        self.expect("thread list",
-            substrs=['stopped', 'stop reason = hit Objective-C exception'])
+        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
+                    substrs=['stopped', 'stop reason = breakpoint'])
 
         self.expect('thread exception', substrs=[
                 '(NSException *) exception = ',

diff  --git a/lldb/source/API/SBThread.cpp b/lldb/source/API/SBThread.cpp
index 9516d72da047..f90e93130960 100644
--- a/lldb/source/API/SBThread.cpp
+++ b/lldb/source/API/SBThread.cpp
@@ -325,8 +325,7 @@ size_t SBThread::GetStopDescription(char *dst, size_t dst_len) {
 
       StopInfoSP stop_info_sp = exe_ctx.GetThreadPtr()->GetStopInfo();
       if (stop_info_sp) {
-        const char *stop_desc =
-            exe_ctx.GetThreadPtr()->GetStopDescription().data();
+        const char *stop_desc = stop_info_sp->GetDescription();
         if (stop_desc) {
           if (dst)
             return ::snprintf(dst, dst_len, "%s", stop_desc);

diff  --git a/lldb/source/Core/FormatEntity.cpp b/lldb/source/Core/FormatEntity.cpp
index e47f109eb41a..4d43df9c3a63 100644
--- a/lldb/source/Core/FormatEntity.cpp
+++ b/lldb/source/Core/FormatEntity.cpp
@@ -166,7 +166,6 @@ static FormatEntity::Entry::Definition g_thread_child_entries[] = {
     ENTRY("queue", ThreadQueue),
     ENTRY("name", ThreadName),
     ENTRY("stop-reason", ThreadStopReason),
-    ENTRY("stop-reason-raw", ThreadStopReasonRaw),
     ENTRY("return-value", ThreadReturnValue),
     ENTRY("completed-expression", ThreadCompletedExpression),
 };
@@ -329,7 +328,6 @@ const char *FormatEntity::Entry::TypeToCString(Type t) {
     ENUM_TO_CSTR(ThreadName);
     ENUM_TO_CSTR(ThreadQueue);
     ENUM_TO_CSTR(ThreadStopReason);
-    ENUM_TO_CSTR(ThreadStopReasonRaw);
     ENUM_TO_CSTR(ThreadReturnValue);
     ENUM_TO_CSTR(ThreadCompletedExpression);
     ENUM_TO_CSTR(ScriptThread);
@@ -1275,23 +1273,15 @@ bool FormatEntity::Format(const Entry &entry, Stream &s,
 
   case Entry::Type::ThreadStopReason:
     if (exe_ctx) {
-      if (Thread *thread = exe_ctx->GetThreadPtr()) {
-        llvm::StringRef stop_description = thread->GetStopDescription();
-        if (!stop_description.empty()) {
-          s.PutCString(stop_description);
-          return true;
-        }
-      }
-    }
-    return false;
-
-  case Entry::Type::ThreadStopReasonRaw:
-    if (exe_ctx) {
-      if (Thread *thread = exe_ctx->GetThreadPtr()) {
-        llvm::StringRef stop_description = thread->GetStopDescriptionRaw();
-        if (!stop_description.empty()) {
-          s.PutCString(stop_description);
-          return true;
+      Thread *thread = exe_ctx->GetThreadPtr();
+      if (thread) {
+        StopInfoSP stop_info_sp = thread->GetStopInfo();
+        if (stop_info_sp && stop_info_sp->IsValid()) {
+          const char *cstr = stop_info_sp->GetDescription();
+          if (cstr && cstr[0]) {
+            s.PutCString(cstr);
+            return true;
+          }
         }
       }
     }

diff  --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
index beb5b13d4950..e5c816d7eef5 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -2673,10 +2673,6 @@ class ObjCExceptionRecognizedStackFrame : public RecognizedStackFrame {
   ValueObjectSP exception;
 
   lldb::ValueObjectSP GetExceptionObject() override { return exception; }
-
-  llvm::StringRef GetStopDescription() override {
-    return "hit Objective-C exception";
-  }
 };
 
 class ObjCExceptionThrowFrameRecognizer : public StackFrameRecognizer {

diff  --git a/lldb/source/Target/AssertFrameRecognizer.cpp b/lldb/source/Target/AssertFrameRecognizer.cpp
deleted file mode 100644
index 489cba19ab13..000000000000
--- a/lldb/source/Target/AssertFrameRecognizer.cpp
+++ /dev/null
@@ -1,173 +0,0 @@
-#include "lldb/Core/Module.h"
-#include "lldb/Symbol/Function.h"
-#include "lldb/Symbol/SymbolContext.h"
-#include "lldb/Target/Process.h"
-#include "lldb/Target/StackFrameList.h"
-#include "lldb/Target/Target.h"
-#include "lldb/Target/Thread.h"
-
-#include "lldb/Utility/Log.h"
-#include "lldb/Utility/Logging.h"
-
-#include "lldb/Target/AssertFrameRecognizer.h"
-
-using namespace llvm;
-using namespace lldb;
-using namespace lldb_private;
-
-namespace lldb_private {
-/// Fetches the abort frame location depending on the current platform.
-///
-/// \param[in] process_sp
-///    The process that is currently aborting. This will give us information on
-///    the target and the platform.
-/// \return
-///    If the platform is supported, returns an optional tuple containing
-///    the abort module as a \a FileSpec and the symbol name as a \a StringRef.
-///    Otherwise, returns \a llvm::None.
-llvm::Optional<std::tuple<FileSpec, StringRef>>
-GetAbortLocation(Process *process) {
-  Target &target = process->GetTarget();
-
-  StringRef module_name;
-  StringRef symbol_name;
-
-  switch (target.GetArchitecture().GetTriple().getOS()) {
-  case llvm::Triple::Darwin:
-  case llvm::Triple::MacOSX:
-    module_name = "libsystem_kernel.dylib";
-    symbol_name = "__pthread_kill";
-    break;
-  case llvm::Triple::Linux:
-    module_name = "libc.so.6";
-    symbol_name = "__GI_raise";
-    break;
-  default:
-    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
-    LLDB_LOG(log, "AssertFrameRecognizer::GetAbortLocation Unsupported OS");
-    return llvm::None;
-  }
-
-  return std::make_tuple(FileSpec(module_name), symbol_name);
-}
-
-/// Fetches the assert frame location depending on the current platform.
-///
-/// \param[in] process_sp
-///    The process that is currently asserting. This will give us information on
-///    the target and the platform.
-/// \return
-///    If the platform is supported, returns an optional tuple containing
-///    the asserting frame module as  a \a FileSpec and the symbol name as a \a
-///    StringRef.
-///    Otherwise, returns \a llvm::None.
-llvm::Optional<std::tuple<FileSpec, StringRef>>
-GetAssertLocation(Process *process) {
-  Target &target = process->GetTarget();
-
-  StringRef module_name;
-  StringRef symbol_name;
-
-  switch (target.GetArchitecture().GetTriple().getOS()) {
-  case llvm::Triple::Darwin:
-  case llvm::Triple::MacOSX:
-    module_name = "libsystem_c.dylib";
-    symbol_name = "__assert_rtn";
-    break;
-  case llvm::Triple::Linux:
-    module_name = "libc.so.6";
-    symbol_name = "__GI___assert_fail";
-    break;
-  default:
-    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
-    LLDB_LOG(log, "AssertFrameRecognizer::GetAbortLocation Unsupported OS");
-    return llvm::None;
-  }
-
-  return std::make_tuple(FileSpec(module_name), symbol_name);
-}
-
-void RegisterAssertFrameRecognizer(Process *process) {
-  static llvm::once_flag g_once_flag;
-  llvm::call_once(g_once_flag, [process]() {
-    auto abort_location = GetAbortLocation(process);
-
-    if (!abort_location.hasValue())
-      return;
-
-    FileSpec module_spec;
-    StringRef function_name;
-    std::tie(module_spec, function_name) = *abort_location;
-
-    StackFrameRecognizerManager::AddRecognizer(
-        StackFrameRecognizerSP(new AssertFrameRecognizer()),
-        module_spec.GetFilename(), ConstString(function_name), false);
-  });
-}
-
-} // namespace lldb_private
-
-AssertRecognizedStackFrame::AssertRecognizedStackFrame(
-    StackFrameSP most_relevant_frame_sp)
-    : m_most_relevant_frame(most_relevant_frame_sp) {}
-
-lldb::RecognizedStackFrameSP
-AssertFrameRecognizer::RecognizeFrame(lldb::StackFrameSP frame_sp) {
-  ThreadSP thread_sp = frame_sp->GetThread();
-  ProcessSP process_sp = thread_sp->GetProcess();
-
-  auto assert_location = GetAssertLocation(process_sp.get());
-
-  if (!assert_location.hasValue())
-    return RecognizedStackFrameSP();
-
-  FileSpec module_spec;
-  StringRef function_name;
-  std::tie(module_spec, function_name) = *assert_location;
-
-  const uint32_t frames_to_fetch = 5;
-  const uint32_t last_frame_index = frames_to_fetch - 1;
-  StackFrameSP prev_frame_sp = nullptr;
-
-  // Fetch most relevant frame
-  for (uint32_t frame_index = 0; frame_index < frames_to_fetch; frame_index++) {
-    prev_frame_sp = thread_sp->GetStackFrameAtIndex(frame_index);
-
-    if (!prev_frame_sp) {
-      Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
-      LLDB_LOG(log, "Abort Recognizer: Hit unwinding bound ({1} frames)!",
-               frames_to_fetch);
-      break;
-    }
-
-    SymbolContext sym_ctx =
-        prev_frame_sp->GetSymbolContext(eSymbolContextEverything);
-
-    if (sym_ctx.module_sp->GetFileSpec().FileEquals(module_spec) &&
-        sym_ctx.GetFunctionName() == ConstString(function_name)) {
-
-      // We go a frame beyond the assert location because the most relevant
-      // frame for the user is the one in which the assert function was called.
-      // If the assert location is the last frame fetched, then it is set as
-      // the most relevant frame.
-
-      StackFrameSP most_relevant_frame_sp = thread_sp->GetStackFrameAtIndex(
-          std::min(frame_index + 1, last_frame_index));
-
-      // Pass assert location to AbortRecognizedStackFrame to set as most
-      // relevant frame.
-      return lldb::RecognizedStackFrameSP(
-          new AssertRecognizedStackFrame(most_relevant_frame_sp));
-    }
-  }
-
-  return RecognizedStackFrameSP();
-};
-
-lldb::StackFrameSP AssertRecognizedStackFrame::GetMostRelevantFrame() {
-  return m_most_relevant_frame;
-}
-
-llvm::StringRef AssertRecognizedStackFrame::GetStopDescription() {
-  return "hit program assert";
-}

diff  --git a/lldb/source/Target/CMakeLists.txt b/lldb/source/Target/CMakeLists.txt
index 893065442e80..12ae2a9dd9da 100644
--- a/lldb/source/Target/CMakeLists.txt
+++ b/lldb/source/Target/CMakeLists.txt
@@ -8,7 +8,6 @@ lldb_tablegen(TargetPropertiesEnum.inc -gen-lldb-property-enum-defs
 
 add_lldb_library(lldbTarget
   ABI.cpp
-  AssertFrameRecognizer.cpp
   ExecutionContext.cpp
   InstrumentationRuntime.cpp
   InstrumentationRuntimeStopInfo.cpp

diff  --git a/lldb/source/Target/Process.cpp b/lldb/source/Target/Process.cpp
index 9dd6af9143a0..b2213d7fc962 100644
--- a/lldb/source/Target/Process.cpp
+++ b/lldb/source/Target/Process.cpp
@@ -38,7 +38,6 @@
 #include "lldb/Symbol/Function.h"
 #include "lldb/Symbol/Symbol.h"
 #include "lldb/Target/ABI.h"
-#include "lldb/Target/AssertFrameRecognizer.h"
 #include "lldb/Target/DynamicLoader.h"
 #include "lldb/Target/InstrumentationRuntime.h"
 #include "lldb/Target/JITLoader.h"
@@ -539,8 +538,6 @@ Process::Process(lldb::TargetSP target_sp, ListenerSP listener_sp,
       target_sp->GetPlatform()->GetDefaultMemoryCacheLineSize();
   if (!value_sp->OptionWasSet() && platform_cache_line_size != 0)
     value_sp->SetUInt64Value(platform_cache_line_size);
-
-  RegisterAssertFrameRecognizer(this);
 }
 
 Process::~Process() {
@@ -937,17 +934,11 @@ bool Process::HandleProcessStateChangedEvent(const EventSP &event_sp,
         Debugger &debugger = process_sp->GetTarget().GetDebugger();
         if (debugger.GetTargetList().GetSelectedTarget().get() ==
             &process_sp->GetTarget()) {
-          ThreadSP thread_sp = process_sp->GetThreadList().GetSelectedThread();
-
-          if (!thread_sp || !thread_sp->IsValid())
-            return false;
-
           const bool only_threads_with_stop_reason = true;
-          const uint32_t start_frame = thread_sp->GetSelectedFrameIndex();
+          const uint32_t start_frame = 0;
           const uint32_t num_frames = 1;
           const uint32_t num_frames_with_source = 1;
           const bool stop_format = true;
-
           process_sp->GetStatus(*stream);
           process_sp->GetThreadStatus(*stream, only_threads_with_stop_reason,
                                       start_frame, num_frames,

diff  --git a/lldb/source/Target/StackFrameRecognizer.cpp b/lldb/source/Target/StackFrameRecognizer.cpp
index 296f2e4366f3..fa71ef7362d9 100644
--- a/lldb/source/Target/StackFrameRecognizer.cpp
+++ b/lldb/source/Target/StackFrameRecognizer.cpp
@@ -92,7 +92,7 @@ class StackFrameRecognizerManagerImpl {
 
   StackFrameRecognizerSP GetRecognizerForFrame(StackFrameSP frame) {
     const SymbolContext &symctx =
-        frame->GetSymbolContext(eSymbolContextEverything);
+        frame->GetSymbolContext(eSymbolContextModule | eSymbolContextFunction);
     ConstString function_name = symctx.GetFunctionName();
     ModuleSP module_sp = symctx.module_sp;
     if (!module_sp) return StackFrameRecognizerSP();

diff  --git a/lldb/source/Target/Thread.cpp b/lldb/source/Target/Thread.cpp
index 75df5310f488..82930ded21a1 100644
--- a/lldb/source/Target/Thread.cpp
+++ b/lldb/source/Target/Thread.cpp
@@ -573,64 +573,9 @@ void Thread::SetState(StateType state) {
   m_state = state;
 }
 
-llvm::StringRef Thread::GetStopDescription() {
-  StackFrameSP frame_sp = GetStackFrameAtIndex(0);
-
-  if (!frame_sp)
-    return GetStopDescriptionRaw();
-
-  auto recognized_frame_sp = frame_sp->GetRecognizedFrame();
-
-  if (!recognized_frame_sp)
-    return GetStopDescriptionRaw();
-
-  llvm::StringRef recognized_stop_description =
-      recognized_frame_sp->GetStopDescription();
-
-  if (!recognized_stop_description.empty())
-    return recognized_stop_description;
-
-  return GetStopDescriptionRaw();
-}
-
-llvm::StringRef Thread::GetStopDescriptionRaw() {
-  StopInfoSP stop_info_sp = GetStopInfo();
-  llvm::StringRef raw_stop_description;
-  if (stop_info_sp && stop_info_sp->IsValid())
-    raw_stop_description = stop_info_sp->GetDescription();
-  return raw_stop_description;
-}
-
-void Thread::SelectMostRelevantFrame() {
-  Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD);
-
-  auto frames_list_sp = GetStackFrameList();
-
-  // Only the top frame should be recognized.
-  auto frame_sp = frames_list_sp->GetFrameAtIndex(0);
-
-  auto recognized_frame_sp = frame_sp->GetRecognizedFrame();
-
-  if (!recognized_frame_sp) {
-    LLDB_LOG(log, "Frame #0 not recognized");
-    return;
-  }
-
-  if (StackFrameSP most_relevant_frame_sp =
-          recognized_frame_sp->GetMostRelevantFrame()) {
-    LLDB_LOG(log, "Found most relevant frame at index {0}",
-             most_relevant_frame_sp->GetFrameIndex());
-    SetSelectedFrame(most_relevant_frame_sp.get());
-  } else {
-    LLDB_LOG(log, "No relevant frame!");
-  }
-}
-
 void Thread::WillStop() {
   ThreadPlan *current_plan = GetCurrentPlan();
 
-  SelectMostRelevantFrame();
-
   // FIXME: I may decide to disallow threads with no plans.  In which
   // case this should go to an assert.
 

diff  --git a/lldb/test/Shell/Recognizer/Inputs/assert.c b/lldb/test/Shell/Recognizer/Inputs/assert.c
deleted file mode 100644
index 612133502915..000000000000
--- a/lldb/test/Shell/Recognizer/Inputs/assert.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <assert.h>
-
-int main() {
-  int a = 42;
-  assert(a == 42);
-  a--;
-  assert(a == 42);
-  return 0;
-}

diff  --git a/lldb/test/Shell/Recognizer/assert.test b/lldb/test/Shell/Recognizer/assert.test
deleted file mode 100644
index 9b4aa21611e0..000000000000
--- a/lldb/test/Shell/Recognizer/assert.test
+++ /dev/null
@@ -1,13 +0,0 @@
-# UNSUPPORTED: system-windows
-# RUN: %clang_host -g -O0 %S/Inputs/assert.c -o %t.out
-# RUN: %lldb -b -s %s %t.out | FileCheck %s
-run
-# CHECK: thread #{{.*}}stop reason = hit program assert
-frame info
-# CHECK: frame #{{.*}}`main at assert.c
-frame recognizer info 0
-# CHECK: frame 0 is recognized by Assert StackFrame Recognizer
-set set thread-format "{${thread.stop-reason-raw}}\n"
-thread info
-# CHECK: signal SIGABRT
-q


        


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