Use a CompletionRequest in the expression command completion [NFC]

The patch was originally written before we had a CompletionRequest,
so it still used a StringList to pass back the completions to
the request.

llvm-svn: 341124
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
index 80d04c1..bf41126 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
@@ -563,7 +563,7 @@
 
   std::string m_expr;
   unsigned m_position = 0;
-  StringList &m_matches;
+  CompletionRequest &m_request;
 
   /// Returns true if the given character can be used in an identifier.
   /// This also returns true for numbers because for completion we usually
@@ -638,10 +638,10 @@
   /// @param[out] position
   ///    The character position of the user cursor in the `expr` parameter.
   ///
-  CodeComplete(StringList &matches, std::string expr, unsigned position)
+  CodeComplete(CompletionRequest &request, std::string expr, unsigned position)
       : CodeCompleteConsumer(CodeCompleteOptions(), false),
         m_info(std::make_shared<GlobalCodeCompletionAllocator>()), m_expr(expr),
-        m_position(position), m_matches(matches) {}
+        m_position(position), m_request(request) {}
 
   /// Deregisters and destroys this code-completion consumer.
   virtual ~CodeComplete() {}
@@ -735,7 +735,7 @@
         // with the kind of result the lldb API expects.
         std::string CompletionSuggestion =
             mergeCompletion(m_expr, m_position, ToInsert);
-        m_matches.AppendString(CompletionSuggestion);
+        m_request.AddCompletion(CompletionSuggestion);
       }
     }
   }
@@ -763,7 +763,7 @@
 };
 } // namespace
 
-bool ClangExpressionParser::Complete(StringList &matches, unsigned line,
+bool ClangExpressionParser::Complete(CompletionRequest &request, unsigned line,
                                      unsigned pos, unsigned typed_pos) {
   DiagnosticManager mgr;
   // We need the raw user expression here because that's what the CodeComplete
@@ -773,7 +773,7 @@
   // the LLVMUserExpression which exposes the right API. This should never fail
   // as we always have a ClangUserExpression whenever we call this.
   LLVMUserExpression &llvm_expr = *static_cast<LLVMUserExpression *>(&m_expr);
-  CodeComplete CC(matches, llvm_expr.GetUserText(), typed_pos);
+  CodeComplete CC(request, llvm_expr.GetUserText(), typed_pos);
   // We don't need a code generator for parsing.
   m_code_generator.reset();
   // Start parsing the expression with our custom code completion consumer.
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
index 7fdc9c1..03ff55f 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
@@ -62,7 +62,7 @@
   //------------------------------------------------------------------
   ~ClangExpressionParser() override;
 
-  bool Complete(StringList &matches, unsigned line, unsigned pos,
+  bool Complete(CompletionRequest &request, unsigned line, unsigned pos,
                 unsigned typed_pos) override;
 
   //------------------------------------------------------------------
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
index c43e9d7..048cef0 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
@@ -643,7 +643,8 @@
 }
 
 bool ClangUserExpression::Complete(ExecutionContext &exe_ctx,
-                                   StringList &matches, unsigned complete_pos) {
+                                   CompletionRequest &request,
+                                   unsigned complete_pos) {
   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 
   // We don't want any visible feedback when completing an expression. Mostly
@@ -709,7 +710,7 @@
   // The actual column where we have to complete is the start column of the
   // user expression + the offset inside the user code that we were given.
   const unsigned completion_column = user_expr_column + complete_pos;
-  parser.Complete(matches, user_expr_line, completion_column, complete_pos);
+  parser.Complete(request, user_expr_line, completion_column, complete_pos);
 
   return true;
 }
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.h
index c26975e..8831d94 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.h
@@ -143,7 +143,7 @@
              lldb_private::ExecutionPolicy execution_policy,
              bool keep_result_in_memory, bool generate_debug_info) override;
 
-  bool Complete(ExecutionContext &exe_ctx, StringList &matches,
+  bool Complete(ExecutionContext &exe_ctx, CompletionRequest &request,
                 unsigned complete_pos) override;
 
   ExpressionTypeSystemHelper *GetTypeSystemHelper() override {