Automerge: Revert "[lldb] Introduce ScriptedFrameProvider for real threads" (#167662)

The new test fails on x86 and arm64 public macOS bots:
```
09:27:59  ======================================================================
09:27:59  FAIL: test_append_frames (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that we can add frames after real stack.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 122, in test_append_frames
09:27:59      self.assertEqual(new_frame_count, original_frame_count + 1)
09:27:59  AssertionError: 5 != 6
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ======================================================================
09:27:59  FAIL: test_applies_to_thread (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that applies_to_thread filters which threads get the provider.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 218, in test_applies_to_thread
09:27:59      self.assertEqual(
09:27:59  AssertionError: 5 != 1 : Thread with ID 1 should have 1 synthetic frame
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ======================================================================
09:27:59  FAIL: test_prepend_frames (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that we can add frames before real stack.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 84, in test_prepend_frames
09:27:59      self.assertEqual(new_frame_count, original_frame_count + 2)
09:27:59  AssertionError: 5 != 7
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ======================================================================
09:27:59  FAIL: test_remove_frame_provider_by_id (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that RemoveScriptedFrameProvider removes a specific provider by ID.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 272, in test_remove_frame_provider_by_id
09:27:59      self.assertEqual(thread.GetNumFrames(), 3, "Should have 3 synthetic frames")
09:27:59  AssertionError: 5 != 3 : Should have 3 synthetic frames
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ======================================================================
09:27:59  FAIL: test_replace_all_frames (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that we can replace the entire stack.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 41, in test_replace_all_frames
09:27:59      self.assertEqual(thread.GetNumFrames(), 3, "Should have 3 synthetic frames")
09:27:59  AssertionError: 5 != 3 : Should have 3 synthetic frames
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ======================================================================
09:27:59  FAIL: test_scripted_frame_objects (TestScriptedFrameProvider.ScriptedFrameProviderTestCase)
09:27:59     Test that provider can return ScriptedFrame objects.
09:27:59  ----------------------------------------------------------------------
09:27:59  Traceback (most recent call last):
09:27:59    File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/functionalities/scripted_frame_provider/TestScriptedFrameProvider.py", line 159, in test_scripted_frame_objects
09:27:59      self.assertEqual(frame0.GetFunctionName(), "custom_scripted_frame_0")
09:27:59  AssertionError: 'thread_func(int)' != 'custom_scripted_frame_0'
09:27:59  - thread_func(int)
09:27:59  + custom_scripted_frame_0
09:27:59
09:27:59  Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
09:27:59  ----------------------------------------------------------------------
09:27:59  Ran 6 tests in 14.242s
09:27:59
09:27:59  FAILED (failures=6)
```

Reverts llvm/llvm-project#161870

Author: Michael137

lldb/bindings/python/python-wrapper.swig

@@ -422,18 +422,6 @@ void *lldb_private::python::LLDBSWIGPython_CastPyObjectToSBBreakpoint(PyObject *
   return sb_ptr;
 }
 
-void *lldb_private::python::LLDBSWIGPython_CastPyObjectToSBThread(PyObject * data) {
-  lldb::SBThread *sb_ptr = nullptr;
-
-  int valid_cast =
-      SWIG_ConvertPtr(data, (void **)&sb_ptr, SWIGTYPE_p_lldb__SBThread, 0);
-
-  if (valid_cast == -1)
-    return NULL;
-
-  return sb_ptr;
-}
-
 void *lldb_private::python::LLDBSWIGPython_CastPyObjectToSBFrame(PyObject * data) {
   lldb::SBFrame *sb_ptr = nullptr;
 

lldb/examples/python/templates/scripted_frame_provider.py

@@ -31,54 +31,7 @@ class ScriptedFrameProvider(metaclass=ABCMeta):
         )
     """
 
-    @staticmethod
-    def applies_to_thread(thread):
-        """Determine if this frame provider should be used for a given thread.
-
-        This static method is called before creating an instance of the frame
-        provider to determine if it should be applied to a specific thread.
-        Override this method to provide custom filtering logic.
-
-        Args:
-            thread (lldb.SBThread): The thread to check.
-
-        Returns:
-            bool: True if this frame provider should be used for the thread,
-                False otherwise. The default implementation returns True for
-                all threads.
-
-        Example:
-
-        .. code-block:: python
-
-            @staticmethod
-            def applies_to_thread(thread):
-                # Only apply to thread 1
-                return thread.GetIndexID() == 1
-        """
-        return True
-
-    @staticmethod
     @abstractmethod
-    def get_description():
-        """Get a description of this frame provider.
-
-        This method should return a human-readable string describing what
-        this frame provider does. The description is used for debugging
-        and display purposes.
-
-        Returns:
-            str: A description of the frame provider.
-
-        Example:
-
-        .. code-block:: python
-
-            def get_description(self):
-                return "Crash log frame provider for thread 1"
-        """
-        pass
-
     def __init__(self, input_frames, args):
         """Construct a scripted frame provider.
 

lldb/examples/python/templates/scripted_process.py

@@ -245,7 +245,6 @@ def __init__(self, process, args):
                 key/value pairs used by the scripted thread.
         """
         self.target = None
-        self.arch = None
         self.originating_process = None
         self.process = None
         self.args = None
@@ -267,9 +266,6 @@ def __init__(self, process, args):
             and process.IsValid()
         ):
             self.target = process.target
-            triple = self.target.triple
-            if triple:
-                self.arch = triple.split("-")[0]
             self.originating_process = process
             self.process = self.target.GetProcess()
             self.get_register_info()
@@ -356,14 +352,17 @@ def get_stackframes(self):
     def get_register_info(self):
         if self.register_info is None:
             self.register_info = dict()
-            if "x86_64" in self.arch:
+            if "x86_64" in self.originating_process.arch:
                 self.register_info["sets"] = ["General Purpose Registers"]
                 self.register_info["registers"] = INTEL64_GPR
-            elif "arm64" in self.arch or self.arch == "aarch64":
+            elif (
+                "arm64" in self.originating_process.arch
+                or self.originating_process.arch == "aarch64"
+            ):
                 self.register_info["sets"] = ["General Purpose Registers"]
                 self.register_info["registers"] = ARM64_GPR
             else:
-                raise ValueError("Unknown architecture", self.arch)
+                raise ValueError("Unknown architecture", self.originating_process.arch)
         return self.register_info
 
     @abstractmethod
@@ -406,12 +405,11 @@ def __init__(self, thread, args):
         """Construct a scripted frame.
 
         Args:
-            thread (ScriptedThread/lldb.SBThread): The thread owning this frame.
+            thread (ScriptedThread): The thread owning this frame.
             args (lldb.SBStructuredData): A Dictionary holding arbitrary
                 key/value pairs used by the scripted frame.
         """
         self.target = None
-        self.arch = None
         self.originating_thread = None
         self.thread = None
         self.args = None
@@ -421,17 +419,15 @@ def __init__(self, thread, args):
         self.register_ctx = {}
         self.variables = []
 
-        if isinstance(thread, ScriptedThread) or (
-            isinstance(thread, lldb.SBThread) and thread.IsValid()
+        if (
+            isinstance(thread, ScriptedThread)
+            or isinstance(thread, lldb.SBThread)
+            and thread.IsValid()
         ):
+            self.target = thread.target
             self.process = thread.process
-            self.target = self.process.target
-            triple = self.target.triple
-            if triple:
-                self.arch = triple.split("-")[0]
-            tid = thread.tid if isinstance(thread, ScriptedThread) else thread.id
             self.originating_thread = thread
-            self.thread = self.process.GetThreadByIndexID(tid)
+            self.thread = self.process.GetThreadByIndexID(thread.tid)
             self.get_register_info()
 
     @abstractmethod
@@ -512,18 +508,7 @@ def get_variables(self, filters):
 
     def get_register_info(self):
         if self.register_info is None:
-            if isinstance(self.originating_thread, ScriptedThread):
-                self.register_info = self.originating_thread.get_register_info()
-            elif isinstance(self.originating_thread, lldb.SBThread):
-                self.register_info = dict()
-                if "x86_64" in self.arch:
-                    self.register_info["sets"] = ["General Purpose Registers"]
-                    self.register_info["registers"] = INTEL64_GPR
-                elif "arm64" in self.arch or self.arch == "aarch64":
-                    self.register_info["sets"] = ["General Purpose Registers"]
-                    self.register_info["registers"] = ARM64_GPR
-                else:
-                    raise ValueError("Unknown architecture", self.arch)
+            self.register_info = self.originating_thread.get_register_info()
         return self.register_info
 
     @abstractmethod
@@ -657,12 +642,12 @@ def get_stop_reason(self):
 
             # TODO: Passthrough stop reason from driving process
             if self.driving_thread.GetStopReason() != lldb.eStopReasonNone:
-                if "arm64" in self.arch:
+                if "arm64" in self.originating_process.arch:
                     stop_reason["type"] = lldb.eStopReasonException
                     stop_reason["data"]["desc"] = (
                         self.driving_thread.GetStopDescription(100)
                     )
-                elif self.arch == "x86_64":
+                elif self.originating_process.arch == "x86_64":
                     stop_reason["type"] = lldb.eStopReasonSignal
                     stop_reason["data"]["signal"] = signal.SIGTRAP
                 else:

lldb/include/lldb/API/SBTarget.h

@@ -19,7 +19,6 @@
 #include "lldb/API/SBLaunchInfo.h"
 #include "lldb/API/SBStatisticsOptions.h"
 #include "lldb/API/SBSymbolContextList.h"
-#include "lldb/API/SBThreadCollection.h"
 #include "lldb/API/SBType.h"
 #include "lldb/API/SBValue.h"
 #include "lldb/API/SBWatchpoint.h"
@@ -987,35 +986,6 @@ class LLDB_API SBTarget {
 
   lldb::SBMutex GetAPIMutex() const;
 
-  /// Register a scripted frame provider for this target.
-  /// If a scripted frame provider with the same name and same argument
-  /// dictionary is already registered on this target, it will be overwritten.
-  ///
-  /// \param[in] class_name
-  ///     The name of the Python class that implements the frame provider.
-  ///
-  /// \param[in] args_dict
-  ///     A dictionary of arguments to pass to the frame provider class.
-  ///
-  /// \param[out] error
-  ///     An error object indicating success or failure.
-  ///
-  /// \return
-  ///     A unique identifier for the frame provider descriptor that was
-  ///     registered. 0 if the registration failed.
-  uint32_t RegisterScriptedFrameProvider(const char *class_name,
-                                         lldb::SBStructuredData args_dict,
-                                         lldb::SBError &error);
-
-  /// Remove a scripted frame provider from this target by name.
-  ///
-  /// \param[in] provider_id
-  ///     The id of the frame provider class to remove.
-  ///
-  /// \return
-  ///     An error object indicating success or failure.
-  lldb::SBError RemoveScriptedFrameProvider(uint32_t provider_id);
-
 protected:
   friend class SBAddress;
   friend class SBAddressRange;

lldb/include/lldb/API/SBThread.h

@@ -256,7 +256,6 @@ class LLDB_API SBThread {
   friend class SBThreadPlan;
   friend class SBTrace;
 
-  friend class lldb_private::ScriptInterpreter;
   friend class lldb_private::python::SWIGBridge;
 
   SBThread(const lldb::ThreadSP &lldb_object_sp);

lldb/include/lldb/API/SBThreadCollection.h

@@ -46,7 +46,6 @@ class LLDB_API SBThreadCollection {
   void SetOpaque(const lldb::ThreadCollectionSP &threads);
 
 private:
-  friend class SBTarget;
   friend class SBProcess;
   friend class SBThread;
   friend class SBSaveCoreOptions;

lldb/include/lldb/Interpreter/Interfaces/ScriptedFrameProviderInterface.h

@@ -16,29 +16,11 @@
 namespace lldb_private {
 class ScriptedFrameProviderInterface : public ScriptedInterface {
 public:
-  virtual bool AppliesToThread(llvm::StringRef class_name,
-                               lldb::ThreadSP thread_sp) {
-    return true;
-  }
-
   virtual llvm::Expected<StructuredData::GenericSP>
   CreatePluginObject(llvm::StringRef class_name,
                      lldb::StackFrameListSP input_frames,
                      StructuredData::DictionarySP args_sp) = 0;
 
-  /// Get a description string for the frame provider.
-  ///
-  /// This is called by the descriptor to fetch a description from the
-  /// scripted implementation. Implementations should call a static method
-  /// on the scripting class to retrieve the description.
-  ///
-  /// \param class_name The name of the scripting class implementing the
-  /// provider.
-  ///
-  /// \return A string describing what this frame provider does, or an
-  ///         empty string if no description is available.
-  virtual std::string GetDescription(llvm::StringRef class_name) { return {}; }
-
   virtual StructuredData::ObjectSP GetFrameAtIndex(uint32_t index) {
     return {};
   }

lldb/include/lldb/Interpreter/ScriptInterpreter.h

@@ -21,7 +21,6 @@
 #include "lldb/API/SBMemoryRegionInfo.h"
 #include "lldb/API/SBStream.h"
 #include "lldb/API/SBSymbolContext.h"
-#include "lldb/API/SBThread.h"
 #include "lldb/Breakpoint/BreakpointOptions.h"
 #include "lldb/Core/PluginInterface.h"
 #include "lldb/Core/SearchFilter.h"
@@ -581,8 +580,6 @@ class ScriptInterpreter : public PluginInterface {
 
   lldb::StreamSP GetOpaqueTypeFromSBStream(const lldb::SBStream &stream) const;
 
-  lldb::ThreadSP GetOpaqueTypeFromSBThread(const lldb::SBThread &exe_ctx) const;
-
   lldb::StackFrameSP GetOpaqueTypeFromSBFrame(const lldb::SBFrame &frame) const;
 
   SymbolContext

lldb/include/lldb/Target/StackFrame.h

@@ -441,11 +441,8 @@ class StackFrame : public ExecutionContextScope,
   ///   frames are included in this frame index count.
   uint32_t GetFrameIndex() const;
 
-  /// Set this frame's frame index.
-  void SetFrameIndex(uint32_t index) {
-    m_frame_index = index;
-    m_concrete_frame_index = index;
-  }
+  /// Set this frame's synthetic frame index.
+  void SetFrameIndex(uint32_t index) { m_frame_index = index; }
 
   /// Query this frame to find what frame it is in this Thread's
   /// StackFrameList, not counting inlined frames.

lldb/include/lldb/Target/StackFrameList.h

@@ -20,13 +20,13 @@ namespace lldb_private {
 
 class ScriptedThread;
 
-class StackFrameList : public std::enable_shared_from_this<StackFrameList> {
+class StackFrameList {
 public:
   // Constructors and Destructors
   StackFrameList(Thread &thread, const lldb::StackFrameListSP &prev_frames_sp,
                  bool show_inline_frames);
 
-  virtual ~StackFrameList();
+  ~StackFrameList();
 
   /// Get the number of visible frames. Frames may be created if \p can_create
   /// is true. Synthetic (inline) frames expanded from the concrete frame #0
@@ -106,7 +106,6 @@ class StackFrameList : public std::enable_shared_from_this<StackFrameList> {
 
 protected:
   friend class Thread;
-  friend class ScriptedFrameProvider;
   friend class ScriptedThread;
 
   /// Use this API to build a stack frame list (used for scripted threads, for
@@ -212,51 +211,26 @@ class StackFrameList : public std::enable_shared_from_this<StackFrameList> {
   /// Whether or not to show synthetic (inline) frames. Immutable.
   const bool m_show_inlined_frames;
 
-  /// Returns true if fetching frames was interrupted, false otherwise.
-  virtual bool FetchFramesUpTo(uint32_t end_idx,
-                               InterruptionControl allow_interrupt);
-
 private:
   uint32_t SetSelectedFrameNoLock(lldb_private::StackFrame *frame);
   lldb::StackFrameSP
   GetFrameAtIndexNoLock(uint32_t idx,
                         std::shared_lock<std::shared_mutex> &guard);
 
-  /// @{
   /// These two Fetch frames APIs and SynthesizeTailCallFrames are called in
   /// GetFramesUpTo, they are the ones that actually add frames.  They must be
   /// called with the writer end of the list mutex held.
-  ///
+
+  /// Returns true if fetching frames was interrupted, false otherwise.
+  bool FetchFramesUpTo(uint32_t end_idx, InterruptionControl allow_interrupt);
   /// Not currently interruptible so returns void.
-  /// }@
   void FetchOnlyConcreteFramesUpTo(uint32_t end_idx);
   void SynthesizeTailCallFrames(StackFrame &next_frame);
 
   StackFrameList(const StackFrameList &) = delete;
   const StackFrameList &operator=(const StackFrameList &) = delete;
 };
 
-/// A StackFrameList that wraps another StackFrameList and uses a
-/// SyntheticFrameProvider to lazily provide frames from either the provider
-/// or the underlying real stack frame list.
-class SyntheticStackFrameList : public StackFrameList {
-public:
-  SyntheticStackFrameList(Thread &thread, lldb::StackFrameListSP input_frames,
-                          const lldb::StackFrameListSP &prev_frames_sp,
-                          bool show_inline_frames);
-
-protected:
-  /// Override FetchFramesUpTo to lazily return frames from the provider
-  /// or from the actual stack frame list.
-  bool FetchFramesUpTo(uint32_t end_idx,
-                       InterruptionControl allow_interrupt) override;
-
-private:
-  /// The input stack frame list that the provider transforms.
-  /// This could be a real StackFrameList or another SyntheticStackFrameList.
-  lldb::StackFrameListSP m_input_frames;
-};
-
 } // namespace lldb_private
 
 #endif // LLDB_TARGET_STACKFRAMELIST_H