Add a --element-count option to the expression command

This option evaluates an expression and, if the result is of pointer type, treats it as if it was an array of that many elements and displays such elements

This has a couple subtle points but is mostly as straightforward as it sounds

Add a parray N <expr> alias for this new mode

Also, extend the --object-description mode to do the moral equivalent of the above but display each element in --object-description mode
Add a poarray N <expr> alias for this

llvm-svn: 267372

1 files changed, 11 insertions, 1 deletions

diff --git a/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp b/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
index bbd9668..c30a978 100644
--- a/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
+++ b/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
@@ -44,7 +44,8 @@ g_option_table[] =
     { LLDB_OPT_SET_1, false, "no-summary-depth",   'Y', OptionParser::eOptionalArgument, nullptr, nullptr, 0, eArgTypeCount,     "Set the depth at which omitting summary information stops (default is 1)."},
     { LLDB_OPT_SET_1, false, "raw-output",         'R', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,      "Don't use formatting options."},
     { LLDB_OPT_SET_1, false, "show-all-children",  'A', OptionParser::eNoArgument,       nullptr, nullptr, 0, eArgTypeNone,      "Ignore the upper bound on the number of children to show."},
-    { LLDB_OPT_SET_1, false, "validate",           'V',  OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeBoolean,   "Show results of type validators."},
+    { LLDB_OPT_SET_1, false, "validate",           'V',  OptionParser::eRequiredArgument, nullptr, nullptr,0, eArgTypeBoolean,   "Show results of type validators."},
+    { LLDB_OPT_SET_1, false, "element-count",      'Z', OptionParser::eRequiredArgument, nullptr, nullptr, 0, eArgTypeCount,     "Treat the result of the expression as if its type is an array of this many values."},
     { 0, false, nullptr, 0, 0, nullptr, nullptr, 0, eArgTypeNone, nullptr }
 };
 
@@ -92,6 +93,12 @@ OptionGroupValueObjectDisplay::SetOptionValue (CommandInterpreter &interpreter,
             if (!success)
                 error.SetErrorStringWithFormat("invalid max depth '%s'", option_arg);
             break;
+
+        case 'Z':
+            elem_count = StringConvert::ToUInt32 (option_arg, UINT32_MAX, 0, &success);
+            if (!success)
+                error.SetErrorStringWithFormat("invalid element count '%s'", option_arg);
+            break;
             
         case 'P':
             ptr_depth = StringConvert::ToUInt32 (option_arg, 0, 0, &success);
@@ -141,6 +148,7 @@ OptionGroupValueObjectDisplay::OptionParsingStarting (CommandInterpreter &interp
     use_objc          = false;
     max_depth         = UINT32_MAX;
     ptr_depth         = 0;
+    elem_count        = 0;
     use_synth         = true;
     be_raw            = false;
     ignore_cap        = false;
@@ -187,6 +195,8 @@ OptionGroupValueObjectDisplay::GetAsDumpOptions (LanguageRuntimeDescriptionDispl
         options.SetRawDisplay();
     
     options.SetRunValidator(run_validator);
+    
+    options.SetElementCount(elem_count);
 
     return options;
 }