[PATCH] D31409: [XRay][tools] Handle "no subcommand" case for llvm-xray
Dean Michael Berris via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Mar 27 16:19:58 PDT 2017
dberris created this revision.
Currently the llvm-xray commandline tool fails to handle the case for
when no subcommand is provided in a graceful manner. This fixes that to
print the help message explaining the subcommands and the available
options.
https://reviews.llvm.org/D31409
Files:
tools/llvm-xray/llvm-xray.cc
Index: tools/llvm-xray/llvm-xray.cc
===================================================================
--- tools/llvm-xray/llvm-xray.cc
+++ tools/llvm-xray/llvm-xray.cc
@@ -30,12 +30,20 @@
" This program consolidates multiple XRay trace "
"processing tools for convenient access.\n");
for (auto *SC : cl::getRegisteredSubcommands()) {
- if (*SC)
+ if (*SC) {
+ // If no subcommand was provided, we need to explicitly check if this is
+ // the top-level subcommand.
+ if (SC == &*cl::TopLevelSubCommand) {
+ cl::PrintHelpMessage(false, true);
+ return 1;
+ }
if (auto C = dispatch(SC)) {
ExitOnError("llvm-xray: ")(C());
return 0;
}
+ }
}
+ // If all else fails, we still print the usage message.
cl::PrintHelpMessage(false, true);
}
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