[lldb] Print an error for unsupported combinations of log options

Print an error for unsupported combinations of log handlers and log
options. Only the stream log handler takes a file and only the circular
and stream handler take a buffer size. This cannot be dealt with through
option groups because the option combinations depend on the requested
handler.

Differential revision: https://reviews.llvm.org/D143623

1 files changed, 14 insertions, 0 deletions

diff --git a/lldb/source/Commands/CommandObjectLog.cpp b/lldb/source/Commands/CommandObjectLog.cpp
index c63d8ce..8549d22 100644
--- a/lldb/source/Commands/CommandObjectLog.cpp
+++ b/lldb/source/Commands/CommandObjectLog.cpp
@@ -177,6 +177,20 @@ protected:
       return false;
     }
 
+    if ((m_options.handler != eLogHandlerCircular &&
+         m_options.handler != eLogHandlerStream) &&
+        m_options.buffer_size.GetCurrentValue() != 0) {
+      result.AppendError("a buffer size can only be specified for the circular "
+                         "and stream buffer handler.\n");
+      return false;
+    }
+
+    if (m_options.handler != eLogHandlerStream && m_options.log_file) {
+      result.AppendError(
+          "a file name can only be specified for the stream handler.\n");
+      return false;
+    }
+
     // Store into a std::string since we're about to shift the channel off.
     const std::string channel = std::string(args[0].ref());
     args.Shift(); // Shift off the channel