Add a "current" token to the ThreadID option to break set/modify.

This provides a convenient way to limit a breakpoint
to the current thread when setting it from the command line w/o
having to figure out what the current thread is.

Differential Revision: https://reviews.llvm.org/D107015

2 files changed, 14 insertions, 2 deletions

diff --git a/lldb/source/Commands/CommandObjectBreakpoint.cpp b/lldb/source/Commands/CommandObjectBreakpoint.cpp
index 722d5c4..3f88a2f 100644
--- a/lldb/source/Commands/CommandObjectBreakpoint.cpp
+++ b/lldb/source/Commands/CommandObjectBreakpoint.cpp
@@ -110,7 +110,19 @@ public:
     case 't': {
       lldb::tid_t thread_id = LLDB_INVALID_THREAD_ID;
       if (option_arg[0] != '\0') {
-        if (option_arg.getAsInteger(0, thread_id))
+        if (option_arg == "current") {
+          if (!execution_context) {
+            error.SetErrorStringWithFormat("No context to determine current "
+                                           "thread");
+          } else {
+            ThreadSP ctx_thread_sp = execution_context->GetThreadSP();
+            if (!ctx_thread_sp || !ctx_thread_sp->IsValid()) {
+              error.SetErrorStringWithFormat("No currently selected thread");
+            } else {
+              thread_id = ctx_thread_sp->GetID();
+            }
+          }
+        } else if (option_arg.getAsInteger(0, thread_id))
           error.SetErrorStringWithFormat("invalid thread id string '%s'",
                                          option_arg.str().c_str());
       }
diff --git a/lldb/source/Commands/Options.td b/lldb/source/Commands/Options.td
index 6abb478..b78fb37 100644
--- a/lldb/source/Commands/Options.td
+++ b/lldb/source/Commands/Options.td
@@ -73,7 +73,7 @@ let Command = "breakpoint modify" in {
     "index matches this argument.">;
   def breakpoint_modify_thread_id : Option<"thread-id", "t">, Group<1>,
     Arg<"ThreadID">, Desc<"The breakpoint stops only for the thread whose TID "
-    "matches this argument.">;
+    "matches this argument.  The token 'current' resolves to the current thread's ID.">;
   def breakpoint_modify_thread_name : Option<"thread-name", "T">, Group<1>,
     Arg<"ThreadName">, Desc<"The breakpoint stops only for the thread whose "
     "thread name matches this argument.">;