Produce a more informative diagnostics when Clang runs out of source locations

[rsmith]

Summary

If Clang runs out of source location address space, produce a more helpful diagnostic than "ran out of source locations" or "translation unit is too large". In addition to that diagnostic, also describe the current source location address space usage, listing the header files that are contributing most to that as well as how many times they were textually entered. The intent is to make it easier to determine if the problem is some kind of misconfiguration (for example, a header isn't properly include-guarded and gets textually entered a lot, or is entered in many AST files), problematic input (for example, a preprocessor metaprogram uses a huge amount of source location space), or a death by a thousand cuts due to the source program just plain being too large.

Also included is a debug pragma to produce the usage report, both to make this more readily testable and to provide visibility into source location address space usage when debugging clang.

[rsmith]

• Update SourceLocationsOverflow test to expect the improved diagnostics.
• Slightly change inc2.h to make the test run 22x faster.

[alexfh]

Thanks for adding this diagnostic! I wonder whether we can include SLoc usage information into -print-stats output?

clang/lib/Basic/SourceManager.cpp

2251

Could you add a comment about the meaning of negative IDIndex values?

clang/test/Lexer/SourceLocationsOverflow.c

7

You probably didn't mean to match local paths on your machine. Same below.

[aaron.ballman]

Thank you for working on this, I think this will help folks who run out of source locations. Can you also add a release note and public docs for this extension?

clang/include/clang/Basic/SourceManager.h

1695–1696

Not that I'm opposed, but how did you arrive at 50?

clang/lib/Basic/SourceManager.cpp

675

Are you planning to do this as part of this patch, or is this more of an aspirational FIXME for the future?

2281–2282

llvm::copy?

clang/lib/Lex/Pragma.cpp

1187

~0ULL?

1190–1195

These predicates can be combined into one if statement.

clang/test/Misc/sloc-usage.cpp

2

Should we do anything special about source locations from the command line, or do those not contribute source locations? (e.g., -D or -U, force include file, etc flags)

(Testing a forced include would be interesting regardless, just to ensure we catch those the same as we do an #include.)

[shafik]

clang/lib/Basic/SourceManager.cpp

2251

Maybe make -(int)LoadedSLocEntryTable.size() a named variable may help readability as well. Perhaps also for (int)LocalSLocEntryTable.size() as well.

[rsmith]

In D137751#3919162, @alexfh wrote:

I wonder whether we can include SLoc usage information into -print-stats output?

Yeah, we could extend the source manager information there with something like this. It's a bit awkward to reuse this implementation because it's geared around producing notes, but it should be fairly straightforward to factor out some common code and extend -print-stats with it in a follow-up change.

clang/include/clang/Basic/SourceManager.h

1695–1696

I was aiming for a number that's small enough that the diagnostic won't run for pages (will fit into a relatively small scroll buffer) but large enough that it should capture problematic usage.

But, you know what, we should be consistent. A default of 32 would match our default limit for notes in constexpr and template backtraces; let's use that. Plus powers of 2 are the best arbitrary numbers.

clang/lib/Basic/SourceManager.cpp

675

This is aspirational. I think it'll be a lot of work to make all the transitive callers of this be able to handle it failing.

2251

Refactored to make it clearer what's going on, added comments.

2281–2282

This is forming a vector of iterators, not a vector of values. Hm, but... I think I can express this better with MapVector and avoid this copy in the process.

clang/lib/Lex/Pragma.cpp

1187

That would be (unsigned long long)-1, which isn't necessarily the same value.

But I think we can do better than forming a large unsigned number here; changed to use Optional.

clang/test/Misc/sloc-usage.cpp

2

For -D etc, we get output that looks like this:

<built-in>:1:1: note: file entered 2 times using 14778B of space
# 1 "<built-in>" 3
^

... where the <built-in>:1:1 is the location of the first time we enter a FileID with a null corresponding const FileEntry*. I think these will all correspond to predefines and similar things, so the <built-in>:1:1 source location seems pretty reasonable.

I've added a test for -include.

[aaron.ballman]

LGTM! Please add a release note when landing so folks know about the improvements here. Thanks!

clang/include/clang/Basic/SourceManager.h

1695–1696

Thanks, that makes more sense! Someday (not today) we might want to consider making this a named constant and using it rather than magic numbers.

clang/lib/Basic/SourceManager.cpp

675

SGTM, thanks!

clang/lib/Lex/Pragma.cpp

1187

Even better! Thanks

[rsmith]

In D137751#3930663, @aaron.ballman wrote:

LGTM! Please add a release note when landing so folks know about the improvements here. Thanks!

Thanks, done and landed.

[rsmith]

Landed in rG9e52db182794d87bb8527dda313afd1ac491ab11.

clang/include/clang/Basic/DiagnosticCommonKinds.td

def err_include_too_large : Error<
   "sorry, this include generates a translation unit too large for"
   " Clang to process.">, DefaultFatal;
 def err_unsupported_bom : Error<"%0 byte order mark detected in '%1', but "
   "encoding is not supported">, DefaultFatal;
 def err_unable_to_rename_temp : Error<
   "unable to rename temporary '%0' to output file '%1': '%2'">;
 def err_unable_to_make_temp : Error<
   "unable to make temporary file: %0">;
+def remark_sloc_usage : Remark<
+  "source manager location address space usage:">,
+  InGroup<DiagGroup<"sloc-usage">>, DefaultRemark, ShowInSystemHeader;
+def note_total_sloc_usage : Note<
+  "%0B in local locations, %1B in locations loaded from AST files, for a total "
+  "of %2B (%3%% of available space)">;
+def note_file_sloc_usage : Note<
+  "file entered %0 time%s0 using %1B of space"
+  "%plural{0:|: plus %2B for macro expansions}2">;
+def note_file_misc_sloc_usage : Note<
+  "%0 additional files entered using a total of %1B of space">;
 
 // Modules
 def err_module_format_unhandled : Error<
   "no handler registered for module format '%0'">, DefaultFatal;
 
 // TransformActions
 // TODO: Use a custom category name to distinguish rewriter errors.
 def err_mt_message : Error<"[rewriter] %0">, SuppressInSystemHeader;

clang/include/clang/Basic/DiagnosticLexKinds.td

def warn_pragma_diagnostic_invalid_option :
    InGroup<UnknownPragmas>;
 def warn_pragma_diagnostic_invalid_token :
    ExtWarn<"unexpected token in pragma diagnostic">,
    InGroup<UnknownPragmas>;
 def warn_pragma_diagnostic_unknown_warning :
    ExtWarn<"unknown warning group '%0', ignored">,
    InGroup<UnknownWarningOption>;
 // - #pragma __debug
+def warn_pragma_debug_missing_command : Warning<
+  "missing debug command">, InGroup<IgnoredPragmas>;
 def warn_pragma_debug_unexpected_command : Warning<
   "unexpected debug command '%0'">, InGroup<IgnoredPragmas>;
 def warn_pragma_debug_missing_argument : Warning<
   "missing argument to debug command '%0'">, InGroup<IgnoredPragmas>;
+def warn_pragma_debug_unexpected_argument : Warning<
+  "unexpected argument to debug command">, InGroup<IgnoredPragmas>;
 def warn_pragma_debug_unknown_module : Warning<
   "unknown module '%0'">, InGroup<IgnoredPragmas>;
 // #pragma module
 def err_pp_expected_module_name : Error<
   "expected %select{identifier after '.' in |}0module name">;
 def err_pp_module_begin_wrong_module : Error<
   "must specify '-fmodule-name=%0' to enter %select{|submodule of }1"
   "this module%select{ (current module is %3)|}2">;

clang/include/clang/Basic/SourceManager.h

class SourceManager : public RefCountedBase<SourceManager> {
   SourceLocation::UIntTy NextLocalOffset;
 
   /// The starting offset of the latest batch of loaded SLocEntries.
   ///
   /// This is LoadedSLocEntryTable.back().Offset, except that that entry might
   /// not have been loaded, so that value would be unknown.
   SourceLocation::UIntTy CurrentLoadedOffset;
 
-  /// The highest possible offset is 2^32-1 (2^63-1 for 64-bit source
+  /// The highest possible offset is 2^31-1 (2^63-1 for 64-bit source
   /// locations), so CurrentLoadedOffset starts at 2^31 (2^63 resp.).
   static const SourceLocation::UIntTy MaxLoadedOffset =
       1ULL << (8 * sizeof(SourceLocation::UIntTy) - 1);
 
   /// A bitmap that indicates whether the entries of LoadedSLocEntryTable
   /// have already been loaded from the external source.
   ///
   /// Same indexing as LoadedSLocEntryTable.
bool hasFileInfo(const FileEntry *File) const {
     return FileInfos.find(File) != FileInfos.end();
   }
 
   /// Print statistics to stderr.
   void PrintStats() const;
 
   void dump() const;
 
+  // Produce notes describing the current source location address space usage.
+  void noteSLocAddressSpaceUsage(DiagnosticsEngine &Diag,
+                                 Optional<unsigned> MaxNotes = 32) const;
+
   /// Get the number of local SLocEntries we have.
   unsigned local_sloc_entry_size() const { return LocalSLocEntryTable.size(); }
 
   /// Get a local SLocEntry. This is exposed for indexing.
   const SrcMgr::SLocEntry &getLocalSLocEntry(unsigned Index) const {
     assert(Index < LocalSLocEntryTable.size() && "Invalid index");
     return LocalSLocEntryTable[Index];
   }

clang/lib/Basic/SourceManager.cpp

 
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManagerInternals.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/Capacity.h"
LoadedSLocEntryTable[Index] = SLocEntry::get(
         LoadedOffset, FileInfo::get(IncludePos, File, FileCharacter, Filename));
     SLocEntryLoaded[Index] = true;
     return FileID::get(LoadedID);
   }
   unsigned FileSize = File.getSize();
   if (!(NextLocalOffset + FileSize + 1 > NextLocalOffset &&
         NextLocalOffset + FileSize + 1 <= CurrentLoadedOffset)) {
     Diag.Report(IncludePos, diag::err_include_too_large);
+    noteSLocAddressSpaceUsage(Diag);
     return FileID();
   }
   LocalSLocEntryTable.push_back(
       SLocEntry::get(NextLocalOffset,
                      FileInfo::get(IncludePos, File, FileCharacter, Filename)));
   // We do a +1 here because we want a SourceLocation that means "the end of the
   // file", e.g. for the "no newline at the end of the file" diagnostic.
   NextLocalOffset += FileSize + 1;
if (LoadedID < 0) {
     assert(LoadedID != -1 && "Loading sentinel FileID");
     unsigned Index = unsigned(-LoadedID) - 2;
     assert(Index < LoadedSLocEntryTable.size() && "FileID out of range");
     assert(!SLocEntryLoaded[Index] && "FileID already loaded");
     LoadedSLocEntryTable[Index] = SLocEntry::get(LoadedOffset, Info);
     SLocEntryLoaded[Index] = true;
     return SourceLocation::getMacroLoc(LoadedOffset);
   }
   LocalSLocEntryTable.push_back(SLocEntry::get(NextLocalOffset, Info));
+  // FIXME: Produce a proper diagnostic for this case.
   assert(NextLocalOffset + Length + 1 > NextLocalOffset &&
          NextLocalOffset + Length + 1 <= CurrentLoadedOffset &&
          "Ran out of source locations!");
   // See createFileID for that +1.
   NextLocalOffset += Length + 1;
   return SourceLocation::getMacroLoc(NextLocalOffset - (Length + 1));
 }
 
if (SLocEntryLoaded[Index]) {
       DumpSLocEntry(ID, LoadedSLocEntryTable[Index], NextStart);
       NextStart = LoadedSLocEntryTable[Index].getOffset();
     } else {
       NextStart = None;
     }
   }
 }
 
+void SourceManager::noteSLocAddressSpaceUsage(
+    DiagnosticsEngine &Diag, Optional<unsigned> MaxNotes) const {
+  struct Info {
+    // A location where this file was entered.
+    SourceLocation Loc;
+    // Number of times this FileEntry was entered.
+    unsigned Inclusions = 0;
+    // Size usage from the file itself.
+    uint64_t DirectSize = 0;
+    // Total size usage from the file and its macro expansions.
+    uint64_t TotalSize = 0;
+  };
+  using UsageMap = llvm::MapVector<const FileEntry*, Info>;
+
+  UsageMap Usage;
+  uint64_t CountedSize = 0;
+
+  auto AddUsageForFileID = [&](FileID ID) {
+    // The +1 here is because getFileIDSize doesn't include the extra byte for
+    // the one-past-the-end location.
+    unsigned Size = getFileIDSize(ID) + 1;
+
+    // Find the file that used this address space, either directly or by
+    // macro expansion.
+    SourceLocation FileStart = getFileLoc(getComposedLoc(ID, 0));
+    FileID FileLocID = getFileID(FileStart);
+    const FileEntry *Entry = getFileEntryForID(FileLocID);
+
+    Info &EntryInfo = Usage[Entry];
+    if (EntryInfo.Loc.isInvalid())
+      EntryInfo.Loc = FileStart;
+    if (ID == FileLocID) {
+      ++EntryInfo.Inclusions;
+      EntryInfo.DirectSize += Size;
+    }
+    EntryInfo.TotalSize += Size;
+    CountedSize += Size;
+  };
+
+  // Loaded SLocEntries have indexes counting downwards from -2.
+  for (size_t Index = 0; Index != LoadedSLocEntryTable.size(); ++Index) {
+    AddUsageForFileID(FileID::get(-2 - Index));
+  }
+  // Local SLocEntries have indexes counting upwards from 0.
+  for (size_t Index = 0; Index != LocalSLocEntryTable.size(); ++Index) {
+    AddUsageForFileID(FileID::get(Index));
+  }
+
+  // Sort the usage by size from largest to smallest. Break ties by raw source
+  // location.
+  auto SortedUsage = Usage.takeVector();
+  auto Cmp = [](const UsageMap::value_type &A, const UsageMap::value_type &B) {
+    return A.second.TotalSize > B.second.TotalSize ||
+           (A.second.TotalSize == B.second.TotalSize &&
+            A.second.Loc < B.second.Loc);
+  };
+  auto SortedEnd = SortedUsage.end();
+  if (MaxNotes && SortedUsage.size() > *MaxNotes) {
+    SortedEnd = SortedUsage.begin() + *MaxNotes;
+    std::nth_element(SortedUsage.begin(), SortedEnd, SortedUsage.end(), Cmp);
+  }
+  std::sort(SortedUsage.begin(), SortedEnd, Cmp);
+
+  // Produce note on sloc address space usage total.
+  uint64_t LocalUsage = NextLocalOffset;
+  uint64_t LoadedUsage = MaxLoadedOffset - CurrentLoadedOffset;
+  int UsagePercent = static_cast<int>(100.0 * double(LocalUsage + LoadedUsage) /
+                                      MaxLoadedOffset);
+  Diag.Report(SourceLocation(), diag::note_total_sloc_usage)
+    << LocalUsage << LoadedUsage << (LocalUsage + LoadedUsage) << UsagePercent;
+
+  // Produce notes on sloc address space usage for each file with a high usage.
+  uint64_t ReportedSize = 0;
+  for (auto &[Entry, FileInfo] :
+       llvm::make_range(SortedUsage.begin(), SortedEnd)) {
+    Diag.Report(FileInfo.Loc, diag::note_file_sloc_usage)
+        << FileInfo.Inclusions << FileInfo.DirectSize
+        << (FileInfo.TotalSize - FileInfo.DirectSize);
+    ReportedSize += FileInfo.TotalSize;
+  }
+
+  // Describe any remaining usage not reported in the per-file usage.
+  if (ReportedSize != CountedSize) {
+    Diag.Report(SourceLocation(), diag::note_file_misc_sloc_usage)
+        << (SortedUsage.end() - SortedEnd) << CountedSize - ReportedSize;
+  }
+}
+
 ExternalSLocEntrySource::~ExternalSLocEntrySource() = default;
 
 /// Return the amount of memory used by memory buffers, breaking down
 /// by heap-backed versus mmap'ed memory.
 SourceManager::MemoryBufferSizes SourceManager::getMemoryBufferSizes() const {
   size_t malloc_bytes = 0;
   size_t mmap_bytes = 0;
 

clang/lib/Lex/Pragma.cpp

 struct PragmaDebugHandler : public PragmaHandler {
   PragmaDebugHandler() : PragmaHandler("__debug") {}
 
   void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                     Token &DebugToken) override {
     Token Tok;
     PP.LexUnexpandedToken(Tok);
     if (Tok.isNot(tok::identifier)) {
-      PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
+      PP.Diag(Tok, diag::warn_pragma_debug_missing_command);
       return;
     }
     IdentifierInfo *II = Tok.getIdentifierInfo();
 
     if (II->isStr("assert")) {
       if (!PP.getPreprocessorOpts().DisablePragmaDebugCrash)
         llvm_unreachable("This is an assertion!");
     } else if (II->isStr("crash")) {
if (II->isStr("assert")) {
             Building.ImportLoc.print(llvm::errs(), PP.getSourceManager());
             llvm::errs() << "\n";
           }
         }
       } else {
         PP.Diag(Tok, diag::warn_pragma_debug_unexpected_command)
           << DumpII->getName();
       }
+    } else if (II->isStr("sloc_usage")) {
+      // An optional integer literal argument specifies the number of files to
+      // specifically report information about.
+      Optional<unsigned> MaxNotes;
+      Token ArgToken;
+      PP.Lex(ArgToken);
+      uint64_t Value;
+      if (ArgToken.is(tok::numeric_constant) &&
+          PP.parseSimpleIntegerLiteral(ArgToken, Value)) {
+        MaxNotes = Value;
+      } else if (ArgToken.isNot(tok::eod)) {
+        PP.Diag(ArgToken, diag::warn_pragma_debug_unexpected_argument);
+      }
+
+      PP.Diag(Tok, diag::remark_sloc_usage);
+      PP.getSourceManager().noteSLocAddressSpaceUsage(PP.getDiagnostics(),
+                                                      MaxNotes);
     } else {
       PP.Diag(Tok, diag::warn_pragma_debug_unexpected_command)
         << II->getName();
     }
 
     PPCallbacks *Callbacks = PP.getPPCallbacks();
     if (Callbacks)
       Callbacks->PragmaDebug(Tok.getLocation(), II->getName());

clang/lib/Serialization/ASTReader.cpp

while (true) {
     case SOURCE_LOCATION_OFFSETS: {
       F.SLocEntryOffsets = (const uint32_t *)Blob.data();
       F.LocalNumSLocEntries = Record[0];
       SourceLocation::UIntTy SLocSpaceSize = Record[1];
       F.SLocEntryOffsetsBase = Record[2] + F.SourceManagerBlockStartOffset;
       std::tie(F.SLocEntryBaseID, F.SLocEntryBaseOffset) =
           SourceMgr.AllocateLoadedSLocEntries(F.LocalNumSLocEntries,
                                               SLocSpaceSize);
-      if (!F.SLocEntryBaseID)
+      if (!F.SLocEntryBaseID) {
+        if (!Diags.isDiagnosticInFlight()) {
+          Diags.Report(SourceLocation(), diag::remark_sloc_usage);
+          SourceMgr.noteSLocAddressSpaceUsage(Diags);
+        }
         return llvm::createStringError(std::errc::invalid_argument,
                                        "ran out of source locations");
+      }
       // Make our entry in the range map. BaseID is negative and growing, so
       // we invert it. Because we invert it, though, we need the other end of
       // the range.
       unsigned RangeStart =
           unsigned(-F.SLocEntryBaseID) - F.LocalNumSLocEntries + 1;
       GlobalSLocEntryMap.insert(std::make_pair(RangeStart, &F));
       F.FirstLoc = SourceLocation::getFromRawEncoding(F.SLocEntryBaseOffset);
 

clang/test/Lexer/Inputs/inc2.h

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clang/test/Lexer/SourceLocationsOverflow.c

 // RUN: not %clang %s -S -o - 2>&1 | FileCheck %s
 // CHECK: In file included from {{.*}}SourceLocationsOverflow.c
 // CHECK-NEXT: inc1.h{{.*}}: fatal error: sorry, this include generates a translation unit too large for Clang to process.
 // CHECK-NEXT: #include "inc2.h"
 // CHECK-NEXT:          ^
+// CHECK-NEXT: note: 214{{.......}}B in local locations, 0B in locations loaded from AST files, for a total of 214{{.......}}B (99% of available space)
+// CHECK-NEXT: {{.*}}inc2.h:1:1: note: file entered 214{{..}} times using 214{{.......}}B of space
+// CHECK-NEXT: /*.................................................................................................
+// CHECK-NEXT: ^
+// CHECK-NEXT: {{.*}}inc1.h:1:1: note: file entered 15 times using 39{{....}}B of space
+// CHECK-NEXT: #include "inc2.h"
+// CHECK-NEXT: ^
+// CHECK-NEXT: <built-in>:1:1: note: file entered {{.*}} times using {{.*}}B of space
+// CHECK-NEXT: # {{.*}}
+// CHECK-NEXT: ^
+// CHECK-NEXT: {{.*}}SourceLocationsOverflow.c:1:1: note: file entered 1 time using {{.*}}B of space
+// CHECK-NEXT: // RUN: not %clang %s -S -o - 2>&1 | FileCheck %s
+// CHECK-NEXT: ^
 // CHECK-NEXT: 1 error generated.
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"
 #include "Inputs/inc1.h"

clang/test/Misc/Inputs/include.h

 #define EQUALS(a,b) a == b
 
+// It's important for sloc_usage.cpp that this file does not have proper
+// include guards.
+#ifndef FOO_DEFINED
+#define FOO_DEFINED
 int foo(int x) { return x; }
+#endif

clang/test/Misc/sloc-usage.cpp

+// RUN: %clang_cc1 -fsyntax-only -verify %s -include %S/Inputs/include.h
+
+#include "Inputs/include.h"
+#include "Inputs/include.h"
+
+#define FOO(x) x + x
+int k = FOO(FOO(123));
+bool b = EQUALS(k, k);
+
+#pragma clang __debug sloc_usage // expected-remark {{address space usage}}
+// expected-note@* {{(0% of available space)}}
+// (this file)     expected-note-re@1 {{file entered 1 time using {{.*}}B of space plus 51B for macro expansions}}
+// (included file) expected-note-re@Inputs/include.h:1 {{file entered 3 times using {{.*}}B of space{{$}}}}
+// (builtins file) expected-note@* {{file entered}}

clang/test/Misc/warning-flags-enabled.c

 // RUN: diagtool show-enabled %s | FileCheck %s
 //
 // This shows warnings which are on by default.
 // We just check a few to make sure it's doing something sensible.
 //
 // CHECK: ext_unterminated_char_or_string
 // CHECK: warn_condition_is_assignment
 // CHECK: warn_null_arg
 
 
-// RUN: diagtool show-enabled -Wno-everything %s | count 0
+// RUN: diagtool show-enabled -Wno-everything -Rno-everything %s | count 0
 
 
 // RUN: diagtool show-enabled -Wno-everything -Wobjc-root-class %s | FileCheck -check-prefix CHECK-WARN %s
 // RUN: diagtool show-enabled -Wno-everything -Werror=objc-root-class %s | FileCheck -check-prefix CHECK-ERROR %s
 // RUN: diagtool show-enabled -Wno-everything -Wfatal-errors=objc-root-class %s | FileCheck -check-prefix CHECK-FATAL %s
 //
 // CHECK-WARN:  W  warn_objc_root_class_missing [-Wobjc-root-class]
 // CHECK-ERROR: E  warn_objc_root_class_missing [-Wobjc-root-class]
 // CHECK-FATAL: F  warn_objc_root_class_missing [-Wobjc-root-class]
 
 // RUN: diagtool show-enabled --no-levels -Wno-everything -Wobjc-root-class %s | FileCheck -check-prefix CHECK-NO-LEVELS %s
 //
-// CHECK-NO-LEVELS-NOT: W
-// CHECK-NO-LEVELS-NOT: E
-// CHECK-NO-LEVELS-NOT: F
+// CHECK-NO-LEVELS-NOT: {{^W }}
+// CHECK-NO-LEVELS-NOT: {{^E }}
+// CHECK-NO-LEVELS-NOT: {{^F }}
 // CHECK-NO-LEVELS: warn_objc_root_class_missing [-Wobjc-root-class]
 
 // Test if EnumConversion is a subgroup of -Wconversion.
 // RUN: diagtool show-enabled --no-levels -Wno-conversion -Wenum-conversion %s | FileCheck --check-prefix CHECK-ENUM-CONVERSION %s
 // RUN: diagtool show-enabled --no-levels %s | FileCheck --check-prefix CHECK-ENUM-CONVERSION %s
 // RUN: diagtool show-enabled --no-levels -Wno-conversion %s | FileCheck --check-prefix CHECK-NO-ENUM-CONVERSION %s
 //
 // CHECK-ENUM-CONVERSION: -Wenum-conversion