Added the concept of a Read-Eval-Print-Loop to LLDB.

A REPL takes over the command line and typically treats input as source code.
REPLs can also do code completion.  The REPL class allows its subclasses to
implement the language-specific functionality without having to know about the
IOHandler-specific internals.

Also added a PluginManager-based way of getting to a REPL given a language and
a target.

Also brought in some utility code and expression options that are useful for
REPLs, such as line offsets for expressions, ANSI terminal coloring of errors,
and a few IOHandler convenience functions.

llvm-svn: 250753

1 files changed, 10 insertions, 1 deletions

diff --git a/lldb/source/Interpreter/CommandInterpreter.cpp b/lldb/source/Interpreter/CommandInterpreter.cpp
index 498a63e86ad..b7cc607e807 100644
--- a/lldb/source/Interpreter/CommandInterpreter.cpp
+++ b/lldb/source/Interpreter/CommandInterpreter.cpp
@@ -85,6 +85,7 @@ g_properties[] =
     { "expand-regex-aliases", OptionValue::eTypeBoolean, true, false, nullptr, nullptr, "If true, regular expression alias commands will show the expanded command that will be executed. This can be used to debug new regular expression alias commands." },
     { "prompt-on-quit", OptionValue::eTypeBoolean, true, true, nullptr, nullptr, "If true, LLDB will prompt you before quitting if there are any live processes being debugged. If false, LLDB will quit without asking in any case." },
     { "stop-command-source-on-error", OptionValue::eTypeBoolean, true, true, nullptr, nullptr, "If true, LLDB will stop running a 'command source' script upon encountering an error." },
+    { "space-repl-prompts", OptionValue::eTypeBoolean, true, false, nullptr, nullptr, "If true, blank lines will be printed between between REPL submissions." },
     { nullptr                  , OptionValue::eTypeInvalid, true, 0    , nullptr, nullptr, nullptr }
 };
 
@@ -92,7 +93,8 @@ enum
 {
     ePropertyExpandRegexAliases = 0,
     ePropertyPromptOnQuit = 1,
-    ePropertyStopCmdSourceOnError = 2
+    ePropertyStopCmdSourceOnError = 2,
+    eSpaceReplPrompts = 3
 };
 
 ConstString &
@@ -167,6 +169,13 @@ CommandInterpreter::GetStopCmdSourceOnError () const
     return m_collection_sp->GetPropertyAtIndexAsBoolean (nullptr, idx, g_properties[idx].default_uint_value != 0);
 }
 
+bool
+CommandInterpreter::GetSpaceReplPrompts () const
+{
+    const uint32_t idx = eSpaceReplPrompts;
+    return m_collection_sp->GetPropertyAtIndexAsBoolean (nullptr, idx, g_properties[idx].default_uint_value != 0);
+}
+
 void
 CommandInterpreter::Initialize ()
 {