Add a scripted way to re-present a stop location (#158128)

This patch adds the notion of "Facade" locations which can be reported
from a ScriptedResolver instead of the actual underlying breakpoint
location for the breakpoint. Also add a "was_hit" method to the scripted
resolver that allows the breakpoint to say which of these "Facade"
locations was hit, and "get_location_description" to provide a
description for the facade locations.

I apologize in advance for the size of the patch. Almost all of what's
here was necessary to (a) make the feature testable and (b) not break
any of the current behavior.

The motivation for this feature is given in the "Providing Facade
Locations" section that I added to the python-reference.rst so I won't
repeat it here.

rdar://152112327

1 files changed, 49 insertions, 0 deletions

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.cpp
index 8083ccae0402..4fdf2b12a550 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.cpp
@@ -81,6 +81,19 @@ ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::StreamSP>(
 }
 
 template <>
+lldb::StackFrameSP
+ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::StackFrameSP>(
+    python::PythonObject &p, Status &error) {
+  if (lldb::SBFrame *sb_frame = reinterpret_cast<lldb::SBFrame *>(
+          python::LLDBSWIGPython_CastPyObjectToSBFrame(p.get())))
+    return m_interpreter.GetOpaqueTypeFromSBFrame(*sb_frame);
+  error = Status::FromErrorString(
+      "Couldn't cast lldb::SBFrame to lldb_private::StackFrame.");
+
+  return nullptr;
+}
+
+template <>
 SymbolContext
 ScriptedPythonInterface::ExtractValueFromPythonObject<SymbolContext>(
     python::PythonObject &p, Status &error) {
@@ -127,6 +140,24 @@ ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::BreakpointSP>(
 }
 
 template <>
+lldb::BreakpointLocationSP
+ScriptedPythonInterface::ExtractValueFromPythonObject<
+    lldb::BreakpointLocationSP>(python::PythonObject &p, Status &error) {
+  lldb::SBBreakpointLocation *sb_break_loc =
+      reinterpret_cast<lldb::SBBreakpointLocation *>(
+          python::LLDBSWIGPython_CastPyObjectToSBBreakpointLocation(p.get()));
+
+  if (!sb_break_loc) {
+    error = Status::FromErrorStringWithFormat(
+        "Couldn't cast lldb::SBBreakpointLocation to "
+        "lldb::BreakpointLocationSP.");
+    return nullptr;
+  }
+
+  return m_interpreter.GetOpaqueTypeFromSBBreakpointLocation(*sb_break_loc);
+}
+
+template <>
 lldb::ProcessAttachInfoSP ScriptedPythonInterface::ExtractValueFromPythonObject<
     lldb::ProcessAttachInfoSP>(python::PythonObject &p, Status &error) {
   lldb::SBAttachInfo *sb_attach_info = reinterpret_cast<lldb::SBAttachInfo *>(
@@ -194,4 +225,22 @@ ScriptedPythonInterface::ExtractValueFromPythonObject<
   return m_interpreter.GetOpaqueTypeFromSBExecutionContext(*sb_exe_ctx);
 }
 
+template <>
+lldb::DescriptionLevel
+ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::DescriptionLevel>(
+    python::PythonObject &p, Status &error) {
+  lldb::DescriptionLevel ret_val = lldb::eDescriptionLevelBrief;
+  llvm::Expected<unsigned long long> unsigned_or_err = p.AsUnsignedLongLong();
+  if (!unsigned_or_err) {
+    error = (Status::FromError(unsigned_or_err.takeError()));
+    return ret_val;
+  }
+  unsigned long long unsigned_val = *unsigned_or_err;
+  if (unsigned_val >= lldb::DescriptionLevel::kNumDescriptionLevels) {
+    error = Status("value too large for lldb::DescriptionLevel.");
+    return ret_val;
+  }
+  return static_cast<lldb::DescriptionLevel>(unsigned_val);
+}
+
 #endif