usage: c-index-test -code-completion-at=<site> <compiler arguments>
       c-index-test -code-completion-timing=<site> <compiler arguments>
       c-index-test -cursor-at=<site> <compiler arguments>
       c-index-test -evaluate-cursor-at=<site> <compiler arguments>
       c-index-test -get-macro-info-cursor-at=<site> <compiler arguments>
       c-index-test -file-refs-at=<site> <compiler arguments>
       c-index-test -file-includes-in=<filename> <compiler arguments>
       c-index-test -index-file [-check-prefix=<FileCheck prefix>] <compiler arguments>
       c-index-test -index-file-full [-check-prefix=<FileCheck prefix>] <compiler arguments>
       c-index-test -index-tu [-check-prefix=<FileCheck prefix>] <AST file>
       c-index-test -index-compile-db [-check-prefix=<FileCheck prefix>] <compilation database>
       c-index-test -test-file-scan <AST file> <source file> [FileCheck prefix]
       c-index-test -test-load-tu <AST file> <symbol filter> [FileCheck prefix]
       c-index-test -test-load-tu-usrs <AST file> <symbol filter> [FileCheck prefix]
       c-index-test -test-load-source <symbol filter> {<args>}*
       c-index-test -test-load-source-memory-usage <symbol filter> {<args>}*
       c-index-test -test-load-source-reparse <trials> <symbol filter>           {<args>}*
       c-index-test -test-load-source-usrs <symbol filter> {<args>}*
       c-index-test -test-load-source-usrs-memory-usage <symbol filter> {<args>}*
       c-index-test -test-annotate-tokens=<range> {<args>}*
       c-index-test -test-inclusion-stack-source {<args>}*
       c-index-test -test-inclusion-stack-tu <AST file>
       c-index-test -test-print-linkage-source {<args>}*
       c-index-test -test-print-visibility {<args>}*
       c-index-test -test-print-type {<args>}*
       c-index-test -test-print-type-size {<args>}*
       c-index-test -test-print-bitwidth {<args>}*
       c-index-test -test-print-target-info {<args>}*
       c-index-test -test-print-type-declaration {<args>}*
       c-index-test -print-usr [<CursorKind> {<args>}]*
       c-index-test -print-usr-file <file>
       c-index-test -write-pch <file> <compiler arguments>
       c-index-test -compilation-db [lookup <filename>] database
       c-index-test -print-build-session-timestamp
       c-index-test -read-diagnostics <file>

 <symbol filter> values:
   all - load all symbols, including those from PCH
   local - load all symbols except those in PCH
   category - only load ObjC categories (non-PCH)
   interface - only load ObjC interfaces (non-PCH)
   protocol - only load ObjC protocols (non-PCH)
   function - only load functions (non-PCH)
   typedef - only load typdefs (non-PCH)
   scan-function - scan function bodies (non-PCH)