[clang-tools-extra] [clangd] Fix is spelled in source bug (PR #76668)

[via cfe-commits]

https://github.com/schenka0 updated https://github.com/llvm/llvm-project/pull/76668

>From fd5e586d807fa4532f26188822ac5790202673bc Mon Sep 17 00:00:00 2001
From: schenka0 <154034018+schenka0 at users.noreply.github.com>
Date: Mon, 1 Jan 2024 01:31:05 -0500
Subject: [PATCH] Check for invalid SLocEntry before getting spelling

---
 clang-tools-extra/clangd/SourceCode.cpp           |  7 ++++++-
 .../clangd/unittests/SourceCodeTests.cpp          | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/clang-tools-extra/clangd/SourceCode.cpp b/clang-tools-extra/clangd/SourceCode.cpp
index 835038423fdf37..8c573cc6fc064a 100644
--- a/clang-tools-extra/clangd/SourceCode.cpp
+++ b/clang-tools-extra/clangd/SourceCode.cpp
@@ -232,7 +232,12 @@ bool isSpelledInSource(SourceLocation Loc, const SourceManager &SM) {
   if (Loc.isFileID())
     return true;
   auto Spelling = SM.getDecomposedSpellingLoc(Loc);
-  StringRef SpellingFile = SM.getSLocEntry(Spelling.first).getFile().getName();
+  bool InvalidSLocEntry = false;
+  const auto SLocEntry = SM.getSLocEntry(Spelling.first, &InvalidSLocEntry);
+  if (InvalidSLocEntry) {
+    return false;
+  }
+  const StringRef SpellingFile = SLocEntry.getFile().getName();
   if (SpellingFile == "<scratch space>")
     return false;
   if (SpellingFile == "<built-in>")
diff --git a/clang-tools-extra/clangd/unittests/SourceCodeTests.cpp b/clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
index 08abde87df6d4d..5dced4d317c605 100644
--- a/clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
+++ b/clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
@@ -813,6 +813,21 @@ TEST(SourceCodeTests, isKeywords) {
   EXPECT_FALSE(isKeyword("override", LangOpts));
 }
 
+TEST(SourceCodeTests, isSpelledInSource) {
+  Annotations Test(R"cpp(
+        int abc = 1;
+    )cpp");
+
+  ParsedAST AST = TestTU::withCode(Test.code()).build();
+  llvm::errs() << Test.code();
+  const SourceManager &SM = AST.getSourceManager();
+
+  EXPECT_TRUE(
+      isSpelledInSource(SM.getLocForStartOfFile(SM.getMainFileID()), SM));
+  EXPECT_TRUE(isSpelledInSource(SourceLocation(), SM));
+  EXPECT_FALSE(isSpelledInSource(SourceLocation::getFromRawEncoding(-1), SM));
+}
+
 struct IncrementalTestStep {
   llvm::StringRef Src;
   llvm::StringRef Contents;