[lldb] show the description in process handle

when the user types `process handle` show that the signal
is used for.

Author: da-viper

lldb/include/lldb/Target/UnixSignals.h

@@ -31,6 +31,8 @@ class UnixSignals {
 
   llvm::StringRef GetSignalAsStringRef(int32_t signo) const;
 
+  llvm::StringRef GetSignalNoDescription(int32_t signo) const;
+
   std::string
   GetSignalDescription(int32_t signo,
                        std::optional<int32_t> code = std::nullopt,

lldb/source/Commands/CommandObjectProcess.cpp

@@ -1603,8 +1603,8 @@ class CommandObjectProcessHandle : public CommandObjectParsed {
   Options *GetOptions() override { return &m_options; }
 
   void PrintSignalHeader(Stream &str) {
-    str.Printf("NAME         PASS   STOP   NOTIFY\n");
-    str.Printf("===========  =====  =====  ======\n");
+    str.Printf("NAME         PASS   STOP   NOTIFY  DESCRIPTION\n");
+    str.Printf("===========  =====  =====  ======  ===================\n");
   }
 
   void PrintSignal(Stream &str, int32_t signo, llvm::StringRef sig_name,
@@ -1616,8 +1616,15 @@ class CommandObjectProcessHandle : public CommandObjectParsed {
     str.Format("{0, -11}  ", sig_name);
     if (signals_sp->GetSignalInfo(signo, suppress, stop, notify)) {
       bool pass = !suppress;
-      str.Printf("%s  %s  %s", (pass ? "true " : "false"),
+      str.Printf("%s  %s  %s  ", (pass ? "true " : "false"),
                  (stop ? "true " : "false"), (notify ? "true " : "false"));
+
+      llvm::StringRef sig_description =
+          signals_sp->GetSignalNoDescription(signo);
+      if (!sig_description.empty()) {
+        str.PutCString(" ");
+        str.PutCString(sig_description);
+      }
     }
     str.Printf("\n");
   }

lldb/source/Target/UnixSignals.cpp

@@ -137,6 +137,13 @@ llvm::StringRef UnixSignals::GetSignalAsStringRef(int32_t signo) const {
   return pos->second.m_name;
 }
 
+llvm::StringRef UnixSignals::GetSignalNoDescription(int32_t signo) const {
+  const auto pos = m_signals.find(signo);
+  if (pos == m_signals.end())
+    return {};
+  return pos->second.m_description;
+}
+
 std::string UnixSignals::GetSignalDescription(
     int32_t signo, std::optional<int32_t> code,
     std::optional<lldb::addr_t> addr, std::optional<lldb::addr_t> lower,