[BOLT] Rename BF::isParentFragment -> isChildOf

`isChildOf` is a more concise name for the check. Also, there's no need to
test if the function is a fragment before doing `isChildOf` check.

Reviewed By: #bolt, rafauler, maksfb

Differential Revision: https://reviews.llvm.org/D142667

bolt/include/bolt/Core/BinaryFunction.h

@@ -1826,9 +1826,9 @@ class BinaryFunction {
   /// Return true if the function is a secondary fragment of another function.
   bool isFragment() const { return IsFragment; }
 
-  /// Returns if the given function is a parent fragment of this function.
-  bool isParentFragment(BinaryFunction *Parent) const {
-    return ParentFragments.count(Parent);
+  /// Returns if this function is a child of \p Other function.
+  bool isChildOf(const BinaryFunction &Other) const {
+    return llvm::is_contained(ParentFragments, &Other);
   }
 
   /// Set the profile data for the number of times the function was called.

bolt/lib/Core/BinaryContext.cpp

@@ -502,8 +502,7 @@ bool BinaryContext::analyzeJumpTable(
     if (!TargetBF)
       return false;
     // Check if BF is a fragment of TargetBF or vice versa.
-    return (BF.isFragment() && BF.isParentFragment(TargetBF)) ||
-           (TargetBF->isFragment() && TargetBF->isParentFragment(&BF));
+    return BF.isChildOf(*TargetBF) || TargetBF->isChildOf(BF);
   };
 
   ErrorOr<BinarySection &> Section = getSectionForAddress(Address);
@@ -745,11 +744,6 @@ BinaryFunction *BinaryContext::createBinaryFunction(
 const MCSymbol *
 BinaryContext::getOrCreateJumpTable(BinaryFunction &Function, uint64_t Address,
                                     JumpTable::JumpTableType Type) {
-  auto isFragmentOf = [](BinaryFunction *Fragment, BinaryFunction *Parent) {
-    return (Fragment->isFragment() && Fragment->isParentFragment(Parent));
-  };
-  (void)isFragmentOf;
-
   // Two fragments of same function access same jump table
   if (JumpTable *JT = getJumpTableContainingAddress(Address)) {
     assert(JT->Type == Type && "jump table types have to match");
@@ -758,8 +752,8 @@ BinaryContext::getOrCreateJumpTable(BinaryFunction &Function, uint64_t Address,
     // Prevent associating a jump table to a specific fragment twice.
     // This simple check arises from the assumption: no more than 2 fragments.
     if (JT->Parents.size() == 1 && JT->Parents[0] != &Function) {
-      assert((isFragmentOf(JT->Parents[0], &Function) ||
-              isFragmentOf(&Function, JT->Parents[0])) &&
+      assert((JT->Parents[0]->isChildOf(Function) ||
+              Function.isChildOf(*JT->Parents[0])) &&
              "cannot re-use jump table of a different function");
       // Duplicate the entry for the parent function for easy access
       JT->Parents.push_back(&Function);
@@ -1100,7 +1094,7 @@ void BinaryContext::generateSymbolHashes() {
 bool BinaryContext::registerFragment(BinaryFunction &TargetFunction,
                                      BinaryFunction &Function) const {
   assert(TargetFunction.isFragment() && "TargetFunction must be a fragment");
-  if (TargetFunction.isParentFragment(&Function))
+  if (TargetFunction.isChildOf(Function))
     return true;
   TargetFunction.addParentFragment(Function);
   Function.addFragment(TargetFunction);
@@ -1223,7 +1217,7 @@ void BinaryContext::processInterproceduralReferences() {
 
     if (TargetFunction) {
       if (TargetFunction->isFragment() &&
-          !TargetFunction->isParentFragment(&Function)) {
+          !TargetFunction->isChildOf(Function)) {
         errs() << "BOLT-WARNING: interprocedural reference between unrelated "
                   "fragments: "
                << Function.getPrintName() << " and "

bolt/lib/Core/Exceptions.cpp

@@ -188,12 +188,7 @@ void BinaryFunction::parseLSDA(ArrayRef<uint8_t> LSDASectionData,
              "BOLT-ERROR: cannot find landing pad fragment");
       BC.addInterproceduralReference(this, Fragment->getAddress());
       BC.processInterproceduralReferences();
-      auto isFragmentOf = [](BinaryFunction *Fragment,
-                             BinaryFunction *Parent) -> bool {
-        return (Fragment->isFragment() && Fragment->isParentFragment(Parent));
-      };
-      (void)isFragmentOf;
-      assert((isFragmentOf(this, Fragment) || isFragmentOf(Fragment, this)) &&
+      assert((isChildOf(*Fragment) || Fragment->isChildOf(*this)) &&
              "BOLT-ERROR: cannot have landing pads in different "
              "functions");
       setHasIndirectTargetToSplitFragment(true);