ExtractAPI: use zero-based indices for line/column in symbol graph (#71753)

Other implementations of the symbol graph format use zero-based indices
for source locations, which causes problems when combined with clang's
current one-based indices. This commit sets ExtractAPI's symbol graph
output to use zero-based indices to align with other implementations.

rdar://107639783

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
index f757522..931933b 100644
--- a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
+++ b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -109,8 +109,8 @@ Object serializeSourcePosition(const PresumedLoc &Loc) {
   assert(Loc.isValid() && "invalid source position");
 
   Object SourcePosition;
-  SourcePosition["line"] = Loc.getLine();
-  SourcePosition["character"] = Loc.getColumn();
+  SourcePosition["line"] = Loc.getLine() - 1;
+  SourcePosition["character"] = Loc.getColumn() - 1;
 
   return SourcePosition;
 }