[clang][ExtractAPI] Refactor ExtractAPIVisitor to make it more extensible

Use CRTP to enable creating statically dispatched subclasses of
ExtractAPIVisitor.
This enables adding extension points and customising the behavior more
easily.

This is used in CXExtractAPI.cpp to create a specialized visitor for
Libclang as well as streamlining the batch implementation in ExtractAPIConsumer.cpp

[clang][ExtractAPI] Improve tests for clang_getSymbolGraphForCursor

Adds a new mode to c-index-test that can fetch a single symbol symbol
graph for a given source location. This way we can be more precise when
writing tests for clang_getSymbolGraphForCursor.
Additionaly this makes it easier to debug the function.

Differential Revision: https://reviews.llvm.org/D146656

1 files changed, 20 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 448435e83027..f116111fface 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -3,6 +3,7 @@
 #include "clang-c/BuildSystem.h"
 #include "clang-c/CXCompilationDatabase.h"
 #include "clang-c/CXErrorCode.h"
+#include "clang-c/CXSourceLocation.h"
 #include "clang-c/CXString.h"
 #include "clang-c/Documentation.h"
 #include "clang-c/Index.h"
@@ -4881,6 +4882,21 @@ dispose_index:
   return result;
 }
 
+static void inspect_single_symbol_sgf_cursor(CXCursor Cursor) {
+  CXSourceLocation CursorLoc;
+  CXString SGFData;
+  const char *SGF;
+  unsigned line, column;
+  CursorLoc = clang_getCursorLocation(Cursor);
+  clang_getSpellingLocation(CursorLoc, 0, &line, &column, 0);
+  printf("%d:%d: ", line, column);
+
+  SGFData = clang_getSymbolGraphForCursor(Cursor);
+  SGF = clang_getCString(SGFData);
+  if (SGF)
+    printf("%s\n", SGF);
+}
+
 /******************************************************************************/
 /* Command line processing.                                                   */
 /******************************************************************************/
@@ -4940,6 +4956,7 @@ static void print_usage(void) {
     "       c-index-test -print-usr-file <file>\n");
   fprintf(stderr,
           "       c-index-test -single-symbol-sgfs <symbol filter> {<args>*}\n"
+          "       c-index-test -single-symbol-sgf-at=<site> {<args>*}\n"
           "       c-index-test -single-symbol-sgf-for=<usr> {<args>}*\n");
   fprintf(stderr,
     "       c-index-test -write-pch <file> <compiler arguments>\n"
@@ -5076,6 +5093,9 @@ int cindextest_main(int argc, const char **argv) {
   else if (argc > 3 && strcmp(argv[1], "-single-symbol-sgfs") == 0)
     return perform_test_load_source(argc - 3, argv + 3, argv[2],
                                     PrintSingleSymbolSGFs, NULL);
+  else if (argc > 2 && strstr(argv[1], "-single-symbol-sgf-at=") == argv[1])
+    return inspect_cursor_at(
+        argc, argv, "-single-symbol-sgf-at=", inspect_single_symbol_sgf_cursor);
   else if (argc > 2 && strstr(argv[1], "-single-symbol-sgf-for=") == argv[1])
     return perform_test_single_symbol_sgf(argv[1], argc - 2, argv + 2);