[CodeComplete] Add an option to omit results from the preamble.

Summary:
Enumerating the contents of a namespace or global scope will omit any
decls that aren't already loaded, instead of deserializing them from the
PCH.

This allows a fast hybrid code completion where symbols from headers are
provided by an external index. (Sema already exposes the information
needed to do a reasonabl job of filtering them).
Clangd plans to implement this hybrid.

This option is just a hint - callers still need to postfilter results if
they want to *avoid* completing decls outside the main file.

Reviewers: bkramer, ilya-biryukov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D41989

llvm-svn: 322371

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/tools/c-index-test/c-index-test.c b/clang/tools/c-index-test/c-index-test.c
index c5e345ef6af..2094be339c8 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -2326,6 +2326,8 @@ int perform_code_completion(int argc, const char **argv, int timing_only) {
     completionOptions |= CXCodeComplete_IncludeCodePatterns;
   if (getenv("CINDEXTEST_COMPLETION_BRIEF_COMMENTS"))
     completionOptions |= CXCodeComplete_IncludeBriefComments;
+  if (getenv("CINDEXTEST_COMPLETION_SKIP_PREAMBLE"))
+    completionOptions |= CXCodeComplete_SkipPreamble;
   
   if (timing_only)
     input += strlen("-code-completion-timing=");