[PATCH] D149504: [clang][CodeGenPGO] Don't use an invalid index when region counts disagree

[Nathan Lanza via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG220e77a83af1: [clang][CodeGenPGO] Don't use an invalid index when region counts disagree (authored by lanza).

Changed prior to commit:
  https://reviews.llvm.org/D149504?vs=518108&id=521200#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149504/new/

https://reviews.llvm.org/D149504

Files:
  clang/lib/CodeGen/CodeGenPGO.h


Index: clang/lib/CodeGen/CodeGenPGO.h
===================================================================
--- clang/lib/CodeGen/CodeGenPGO.h
+++ clang/lib/CodeGen/CodeGenPGO.h
@@ -114,7 +114,12 @@
       return 0;
     if (!haveRegionCounts())
       return 0;
-    return RegionCounts[(*RegionCounterMap)[S]];
+    // With profiles from a differing version of clang we can have mismatched
+    // decl counts. Don't crash in such a case.
+    auto Index = (*RegionCounterMap)[S];
+    if (Index >= RegionCounts.size())
+      return 0;
+    return RegionCounts[Index];
   }
 };
 


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