[PATCH] D135356: [Format] Fix crash when hitting eof while lexing JS template string

[Sam McCall via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG882a05afa17f: [Format] Fix crash when hitting eof while lexing JS template string (authored by sammccall).

Changed prior to commit:
  https://reviews.llvm.org/D135356?vs=465699&id=465742#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D135356/new/

https://reviews.llvm.org/D135356

Files:
  clang/lib/Format/FormatTokenLexer.cpp
  clang/unittests/Format/FormatTestJS.cpp


Index: clang/unittests/Format/FormatTestJS.cpp
===================================================================
--- clang/unittests/Format/FormatTestJS.cpp
+++ clang/unittests/Format/FormatTestJS.cpp
@@ -2145,6 +2145,8 @@
 
   // Crashed at some point.
   verifyFormat("}");
+  verifyFormat("`");
+  verifyFormat("`\\");
 }
 
 TEST_F(FormatTestJS, TaggedTemplateStrings) {
Index: clang/lib/Format/FormatTokenLexer.cpp
===================================================================
--- clang/lib/Format/FormatTokenLexer.cpp
+++ clang/lib/Format/FormatTokenLexer.cpp
@@ -760,6 +760,7 @@
   for (; Offset != Lex->getBuffer().end(); ++Offset) {
     if (Offset[0] == '`') {
       StateStack.pop();
+      ++Offset;
       break;
     }
     if (Offset[0] == '\\') {
@@ -768,12 +769,12 @@
                Offset[1] == '{') {
       // '${' introduces an expression interpolation in the template string.
       StateStack.push(LexerState::NORMAL);
-      ++Offset;
+      Offset += 2;
       break;
     }
   }
 
-  StringRef LiteralText(TmplBegin, Offset - TmplBegin + 1);
+  StringRef LiteralText(TmplBegin, Offset - TmplBegin);
   BacktickToken->setType(TT_TemplateString);
   BacktickToken->Tok.setKind(tok::string_literal);
   BacktickToken->TokenText = LiteralText;
@@ -794,9 +795,7 @@
                                       StartColumn, Style.TabWidth, Encoding);
   }
 
-  SourceLocation loc = Offset < Lex->getBuffer().end()
-                           ? Lex->getSourceLocation(Offset + 1)
-                           : SourceMgr.getLocForEndOfFile(ID);
+  SourceLocation loc = Lex->getSourceLocation(Offset);
   resetLexer(SourceMgr.getFileOffset(loc));
 }
 


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