[clang] [llvm] [NFCI][Sanitizer] Convert Matcher::Globs from StringMap to vector. (PR #140964)

[Qinkun Bao via cfe-commits]

https://github.com/qinkunbao created https://github.com/llvm/llvm-project/pull/140964

As discussed in https://github.com/llvm/llvm-project/pull/139772, Matcher::Globs can keep the order when parsing the case list.


>From 534d49d489476ffd1aa8f23d21a02f29d3b823fc Mon Sep 17 00:00:00 2001
From: Qinkun Bao <qinkun at google.com>
Date: Wed, 21 May 2025 22:12:13 +0000
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.6
---
 clang/lib/Basic/Diagnostic.cpp              |  5 ++++-
 llvm/include/llvm/Support/SpecialCaseList.h |  2 +-
 llvm/lib/Support/SpecialCaseList.cpp        | 21 ++++++++++-----------
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/clang/lib/Basic/Diagnostic.cpp b/clang/lib/Basic/Diagnostic.cpp
index b48eed8650672..8168c36d9ccce 100644
--- a/clang/lib/Basic/Diagnostic.cpp
+++ b/clang/lib/Basic/Diagnostic.cpp
@@ -553,7 +553,10 @@ void WarningsSpecialCaseList::processSections(DiagnosticsEngine &Diags) {
     // Each section has a matcher with that section's name, attached to that
     // line.
     const auto &DiagSectionMatcher = Entry.SectionMatcher;
-    unsigned DiagLine = DiagSectionMatcher->Globs.at(DiagName).second;
+    unsigned DiagLine = 0;
+    for (const auto &[Pattern, Pair] : DiagSectionMatcher->Globs)
+      if (Pattern == DiagName)
+        DiagLine = Pair.second;
     LineAndSectionEntry.emplace_back(DiagLine, &Entry);
   }
   llvm::sort(LineAndSectionEntry);
diff --git a/llvm/include/llvm/Support/SpecialCaseList.h b/llvm/include/llvm/Support/SpecialCaseList.h
index fc6dc93651f38..14d83e64ec28c 100644
--- a/llvm/include/llvm/Support/SpecialCaseList.h
+++ b/llvm/include/llvm/Support/SpecialCaseList.h
@@ -125,7 +125,7 @@ class SpecialCaseList {
     // Returns zero if no match is found.
     LLVM_ABI unsigned match(StringRef Query) const;
 
-    StringMap<std::pair<GlobPattern, unsigned>> Globs;
+    std::vector<std::pair<std::string, std::pair<GlobPattern, unsigned>>> Globs;
     std::vector<std::pair<std::unique_ptr<Regex>, unsigned>> RegExes;
   };
 
diff --git a/llvm/lib/Support/SpecialCaseList.cpp b/llvm/lib/Support/SpecialCaseList.cpp
index dddf84cbb1ced..3e43f7bc93eff 100644
--- a/llvm/lib/Support/SpecialCaseList.cpp
+++ b/llvm/lib/Support/SpecialCaseList.cpp
@@ -53,17 +53,16 @@ Error SpecialCaseList::Matcher::insert(StringRef Pattern, unsigned LineNumber,
     return Error::success();
   }
 
-  auto [It, DidEmplace] = Globs.try_emplace(Pattern);
-  if (DidEmplace) {
-    // We must be sure to use the string in the map rather than the provided
-    // reference which could be destroyed before match() is called
-    Pattern = It->getKey();
-    auto &Pair = It->getValue();
-    if (auto Err = GlobPattern::create(Pattern, /*MaxSubPatterns=*/1024)
-                       .moveInto(Pair.first))
-      return Err;
-    Pair.second = LineNumber;
-  }
+  Globs.emplace_back();
+  auto &Glob = Globs.back();
+  Glob.first = Pattern;
+  auto &Pair = Glob.second;
+  // We must be sure to use the string in the map rather than the provided
+  // reference which could be destroyed before match() is called
+  if (auto Err = GlobPattern::create(Glob.first, /*MaxSubPatterns=*/1024)
+                     .moveInto(Pair.first))
+    return Err;
+  Pair.second = LineNumber;
   return Error::success();
 }