Initial implementation of a code-completion interface in Clang. In

essence, code completion is triggered by a magic "code completion"
token produced by the lexer [*], which the parser recognizes at
certain points in the grammar. The parser then calls into the Action
object with the appropriate CodeCompletionXXX action.

Sema implements the CodeCompletionXXX callbacks by performing minimal
translation, then forwarding them to a CodeCompletionConsumer
subclass, which uses the results of semantic analysis to provide
code-completion results. At present, only a single, "printing" code
completion consumer is available, for regression testing and
debugging. However, the design is meant to permit other
code-completion consumers.

This initial commit contains two code-completion actions: one for
member access, e.g., "x." or "p->", and one for
nested-name-specifiers, e.g., "std::". More code-completion actions
will follow, along with improved gathering of code-completion results
for the various contexts.

[*] In the current -code-completion-dump testing/debugging mode, the
file is truncated at the completion point and EOF is translated into
"code completion".

llvm-svn: 82166

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index bfa090a09e8..4e522cbb8a4 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -71,6 +71,7 @@ Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts,
   // Macro expansion is enabled.
   DisableMacroExpansion = false;
   InMacroArgs = false;
+  IsMainFileEofCodeCompletion = false;
   NumCachedTokenLexers = 0;
 
   CachedLexPos = 0;
@@ -368,6 +369,13 @@ void Preprocessor::EnterMainSourceFile() {
   // Enter the main file source buffer.
   EnterSourceFile(MainFileID, 0);
 
+  if (IsMainFileEofCodeCompletion) {
+    // Tell our newly-created lexer that it should treat its end-of-file as
+    // a code-completion token.
+    IsMainFileEofCodeCompletion = false;
+    static_cast<Lexer *>(getCurrentFileLexer())->SetEofIsCodeCompletion();
+  }
+  
   // Tell the header info that the main file was entered.  If the file is later
   // #imported, it won't be re-entered.
   if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID))