[libclang] Avoid crashing when getting layout info of an undeduced type.

When the type is not deducible, return an error instead of crashing.

This fixes https://bugs.llvm.org/show_bug.cgi?id=40813.

Differential Revision: https://reviews.llvm.org/D58569

llvm-svn: 354885

1 files changed, 28 insertions, 11 deletions

diff --git a/clang/tools/c-index-test/c-index-test.c b/clang/tools/c-index-test/c-index-test.c
index fc6ba46..2cf442e 100644
--- a/clang/tools/c-index-test/c-index-test.c
+++ b/clang/tools/c-index-test/c-index-test.c
@@ -1670,29 +1670,44 @@ static enum CXChildVisitResult PrintType(CXCursor cursor, CXCursor p,
   return CXChildVisit_Recurse;
 }
 
-static enum CXChildVisitResult PrintTypeSize(CXCursor cursor, CXCursor p,
-                                             CXClientData d) {
-  CXType T;
-  enum CXCursorKind K = clang_getCursorKind(cursor);
-  if (clang_isInvalid(K))
-    return CXChildVisit_Recurse;
-  T = clang_getCursorType(cursor);
-  PrintCursor(cursor, NULL);
-  PrintTypeAndTypeKind(T, " [type=%s] [typekind=%s]");
+static void PrintSingleTypeSize(CXType T, const char *TypeKindFormat,
+                                const char *SizeFormat,
+                                const char *AlignFormat) {
+  PrintTypeAndTypeKind(T, TypeKindFormat);
   /* Print the type sizeof if applicable. */
   {
     long long Size = clang_Type_getSizeOf(T);
     if (Size >= 0 || Size < -1 ) {
-      printf(" [sizeof=%lld]", Size);
+      printf(SizeFormat, Size);
     }
   }
   /* Print the type alignof if applicable. */
   {
     long long Align = clang_Type_getAlignOf(T);
     if (Align >= 0 || Align < -1) {
-      printf(" [alignof=%lld]", Align);
+      printf(AlignFormat, Align);
     }
   }
+
+  /* Print the return type if it exists. */
+  {
+    CXType RT = clang_getResultType(T);
+    if (RT.kind != CXType_Invalid)
+      PrintSingleTypeSize(RT, " [resulttype=%s] [resulttypekind=%s]",
+                              " [resultsizeof=%lld]", " [resultalignof=%lld]");
+  }
+}
+
+static enum CXChildVisitResult PrintTypeSize(CXCursor cursor, CXCursor p,
+                                             CXClientData d) {
+  CXType T;
+  enum CXCursorKind K = clang_getCursorKind(cursor);
+  if (clang_isInvalid(K))
+    return CXChildVisit_Recurse;
+  T = clang_getCursorType(cursor);
+  PrintCursor(cursor, NULL);
+  PrintSingleTypeSize(T, " [type=%s] [typekind=%s]", " [sizeof=%lld]",
+                      " [alignof=%lld]");
   /* Print the record field offset if applicable. */
   {
     CXString FieldSpelling = clang_getCursorSpelling(cursor);
@@ -1730,7 +1745,9 @@ static enum CXChildVisitResult PrintTypeSize(CXCursor cursor, CXCursor p,
     if (IsBitfield)
       printf(" [BitFieldSize=%d]", clang_getFieldDeclBitWidth(cursor));
   }
+
   printf("\n");
+
   return CXChildVisit_Recurse;
 }