[clang] [clang][NFC] Use range-based for loops (PR #96831)

[via cfe-commits]

https://github.com/MagentaTreehouse created 
https://github.com/llvm/llvm-project/pull/96831

Use range-based for loops. In addition, extracted a loop from 
`CXXRecordDecl::completeDefinition` to eliminate the `Done` flag, and only 
construct `MyFinalOverriders` when `FinalOverriders` is null.

>From bdffd46532a1f4356f51b788aba6b9c52672d053 Mon Sep 17 00:00:00 2001
From: Mingyi Chen <cmingy...@gmail.com>
Date: Wed, 26 Jun 2024 19:21:27 -0400
Subject: [PATCH] [clang][NFC] Use range-based for loops

---
 clang/lib/AST/DeclCXX.cpp | 64 +++++++++++++++++++--------------------
 1 file changed, 32 insertions(+), 32 deletions(-)

diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
index 7f2c786547b9b..18f2b76d9e781 100644
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -1521,11 +1521,11 @@ void CXXRecordDecl::setCaptures(ASTContext &Context,
   auto *ToCapture = (LambdaCapture *)Context.Allocate(sizeof(LambdaCapture) *
                                                       Captures.size());
   Data.AddCaptureList(Context, ToCapture);
-  for (unsigned I = 0, N = Captures.size(); I != N; ++I) {
-    if (Captures[I].isExplicit())
+  for (const LambdaCapture &C : Captures) {
+    if (C.isExplicit())
       ++Data.NumExplicitCaptures;
 
-    new (ToCapture) LambdaCapture(Captures[I]);
+    new (ToCapture) LambdaCapture(C);
     ToCapture++;
   }
 
@@ -2056,40 +2056,40 @@ void CXXRecordDecl::completeDefinition() {
   completeDefinition(nullptr);
 }
 
+static bool hasPureVirtualFinalOverrider(
+    const CXXRecordDecl &RD, const CXXFinalOverriderMap *FinalOverriders) {
+  auto ExistsIn = [](const CXXFinalOverriderMap &FinalOverriders) {
+    for (const auto &[_, M] : FinalOverriders) {
+      for (const auto &[_, SO] : M) {
+        assert(SO.size() > 0 &&
+              "All virtual functions have overriding virtual functions");
+
+        if (SO.front().Method->isPureVirtual())
+          return true;
+      }
+    }
+    return false;
+  };
+
+  if (FinalOverriders)
+    return ExistsIn(*FinalOverriders);
+  CXXFinalOverriderMap MyFinalOverriders;
+  RD.getFinalOverriders(MyFinalOverriders);
+  return ExistsIn(MyFinalOverriders);
+}
+
 void CXXRecordDecl::completeDefinition(CXXFinalOverriderMap *FinalOverriders) {
   RecordDecl::completeDefinition();
 
   // If the class may be abstract (but hasn't been marked as such), check for
   // any pure final overriders.
-  if (mayBeAbstract()) {
-    CXXFinalOverriderMap MyFinalOverriders;
-    if (!FinalOverriders) {
-      getFinalOverriders(MyFinalOverriders);
-      FinalOverriders = &MyFinalOverriders;
-    }
-
-    bool Done = false;
-    for (CXXFinalOverriderMap::iterator M = FinalOverriders->begin(),
-                                     MEnd = FinalOverriders->end();
-         M != MEnd && !Done; ++M) {
-      for (OverridingMethods::iterator SO = M->second.begin(),
-                                    SOEnd = M->second.end();
-           SO != SOEnd && !Done; ++SO) {
-        assert(SO->second.size() > 0 &&
-               "All virtual functions have overriding virtual functions");
-
-        // C++ [class.abstract]p4:
-        //   A class is abstract if it contains or inherits at least one
-        //   pure virtual function for which the final overrider is pure
-        //   virtual.
-        if (SO->second.front().Method->isPureVirtual()) {
-          data().Abstract = true;
-          Done = true;
-          break;
-        }
-      }
-    }
-  }
+  //
+  // C++ [class.abstract]p4:
+  //   A class is abstract if it contains or inherits at least one
+  //   pure virtual function for which the final overrider is pure
+  //   virtual.
+  if (mayBeAbstract() && hasPureVirtualFinalOverrider(*this, FinalOverriders))
+    markAbstract();
 
   // Set access bits correctly on the directly-declared conversions.
   for (conversion_iterator I = conversion_begin(), E = conversion_end();

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