[lldb] Implement CLI support for reverse-continue (#132783)

This introduces the options "-F/--forward" and "-R/--reverse" to
`process continue`.

These only work if you're running with a gdbserver backend that supports
reverse execution, such as rr. For testing we rely on the fake
reverse-execution functionality in `lldbreverse.py`.

1 files changed, 12 insertions, 1 deletions

diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 654dfa8..ed80c85 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -468,7 +468,13 @@ protected:
       case 'b':
         m_run_to_bkpt_args.AppendArgument(option_arg);
         m_any_bkpts_specified = true;
-      break;
+        break;
+      case 'F':
+        m_base_direction = lldb::RunDirection::eRunForward;
+        break;
+      case 'R':
+        m_base_direction = lldb::RunDirection::eRunReverse;
+        break;
       default:
         llvm_unreachable("Unimplemented option");
       }
@@ -479,6 +485,7 @@ protected:
       m_ignore = 0;
       m_run_to_bkpt_args.Clear();
       m_any_bkpts_specified = false;
+      m_base_direction = std::nullopt;
     }
 
     llvm::ArrayRef<OptionDefinition> GetDefinitions() override {
@@ -488,6 +495,7 @@ protected:
     uint32_t m_ignore = 0;
     Args m_run_to_bkpt_args;
     bool m_any_bkpts_specified = false;
+    std::optional<lldb::RunDirection> m_base_direction;
   };
 
   void DoExecute(Args &command, CommandReturnObject &result) override {
@@ -654,6 +662,9 @@ protected:
         }
       }
 
+      if (m_options.m_base_direction.has_value())
+        process->SetBaseDirection(*m_options.m_base_direction);
+
       const uint32_t iohandler_id = process->GetIOHandlerID();
 
       StreamString stream;