[NoSanitizeList][NFI] Add containsPrefix to remove duplicated logics. (#142027)

See #142006 and
#139128

---------

Co-authored-by: Vitaly Buka <vitalybuka@google.com>

Author: qinkunbao

clang/include/clang/Basic/NoSanitizeList.h

@@ -29,6 +29,8 @@ class SanitizerSpecialCaseList;
 class NoSanitizeList {
   std::unique_ptr<SanitizerSpecialCaseList> SSCL;
   SourceManager &SM;
+  bool containsPrefix(SanitizerMask Mask, StringRef Prefix, StringRef Name,
+                      StringRef Category) const;
 
 public:
   NoSanitizeList(const std::vector<std::string> &NoSanitizeListPaths,

clang/lib/Basic/NoSanitizeList.cpp

@@ -27,18 +27,29 @@ NoSanitizeList::NoSanitizeList(const std::vector<std::string> &NoSanitizePaths,
 
 NoSanitizeList::~NoSanitizeList() = default;
 
+bool NoSanitizeList::containsPrefix(SanitizerMask Mask, StringRef Prefix,
+                                    StringRef Name, StringRef Category) const {
+  std::pair<unsigned, unsigned> NoSan =
+      SSCL->inSectionBlame(Mask, Prefix, Name, Category);
+  if (NoSan == llvm::SpecialCaseList::NotFound)
+    return false;
+  std::pair<unsigned, unsigned> San =
+      SSCL->inSectionBlame(Mask, Prefix, Name, "sanitize");
+  // The statement evaluates to true under the following conditions:
+  // 1. The string "prefix:*=sanitize" is absent.
+  // 2. If "prefix:*=sanitize" is present, its (File Index, Line Number) is less
+  // than that of "prefix:*".
+  return San == llvm::SpecialCaseList::NotFound || NoSan > San;
+}
+
 bool NoSanitizeList::containsGlobal(SanitizerMask Mask, StringRef GlobalName,
                                     StringRef Category) const {
   return SSCL->inSection(Mask, "global", GlobalName, Category);
 }
 
 bool NoSanitizeList::containsType(SanitizerMask Mask, StringRef MangledTypeName,
                                   StringRef Category) const {
-  auto NoSan = SSCL->inSectionBlame(Mask, "type", MangledTypeName, Category);
-  if (NoSan == llvm::SpecialCaseList::NotFound)
-    return false;
-  auto San = SSCL->inSectionBlame(Mask, "type", MangledTypeName, "sanitize");
-  return San == llvm::SpecialCaseList::NotFound || NoSan > San;
+  return containsPrefix(Mask, "type", MangledTypeName, Category);
 }
 
 bool NoSanitizeList::containsFunction(SanitizerMask Mask,
@@ -48,11 +59,7 @@ bool NoSanitizeList::containsFunction(SanitizerMask Mask,
 
 bool NoSanitizeList::containsFile(SanitizerMask Mask, StringRef FileName,
                                   StringRef Category) const {
-  auto NoSan = SSCL->inSectionBlame(Mask, "src", FileName, Category);
-  if (NoSan == llvm::SpecialCaseList::NotFound)
-    return false;
-  auto San = SSCL->inSectionBlame(Mask, "src", FileName, "sanitize");
-  return San == llvm::SpecialCaseList::NotFound || NoSan > San;
+  return containsPrefix(Mask, "src", FileName, Category);
 }
 
 bool NoSanitizeList::containsMainFile(SanitizerMask Mask, StringRef FileName,