From bf2f72fa10e3469b4f1bc6a85129c7074c65cfb2 Mon Sep 17 00:00:00 2001
From: Florian Mayer <fmayer@google.com>
Date: Fri, 11 Feb 2022 15:46:37 -0800
Subject: [PATCH] [hwasan] keep debug intrinsicts in AllocaInfo.

Reviewed By: eugenis

Differential Revision: https://reviews.llvm.org/D119498
---
 llvm/include/llvm/Transforms/Utils/MemoryTaggingSupport.h  |  2 +-
 llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp |  2 +-
 llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp         | 12 ++++++++----
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/llvm/include/llvm/Transforms/Utils/MemoryTaggingSupport.h b/llvm/include/llvm/Transforms/Utils/MemoryTaggingSupport.h
index d858432..d1548ec 100644
--- a/llvm/include/llvm/Transforms/Utils/MemoryTaggingSupport.h
+++ b/llvm/include/llvm/Transforms/Utils/MemoryTaggingSupport.h
@@ -76,12 +76,12 @@ struct AllocaInfo {
   AllocaInst *AI;
   SmallVector<IntrinsicInst *, 2> LifetimeStart;
   SmallVector<IntrinsicInst *, 2> LifetimeEnd;
+  SmallVector<DbgVariableIntrinsic *, 2> DbgVariableIntrinsics;
 };
 
 struct StackInfo {
   MapVector<AllocaInst *, AllocaInfo> AllocasToInstrument;
   SmallVector<Instruction *, 4> UnrecognizedLifetimes;
-  DenseMap<AllocaInst *, std::vector<DbgVariableIntrinsic *>> AllocaDbgMap;
   SmallVector<Instruction *, 8> RetVec;
   bool CallsReturnTwice = false;
 };
diff --git a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
index 5dbe321..34b0576 100644
--- a/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
@@ -1341,7 +1341,7 @@ bool HWAddressSanitizer::instrumentStack(
     AI->replaceUsesWithIf(Replacement,
                           [AILong](Use &U) { return U.getUser() != AILong; });
 
-    for (auto *DDI : SInfo.AllocaDbgMap.lookup(AI)) {
+    for (auto *DDI : Info.DbgVariableIntrinsics) {
       // Prepend "tag_offset, N" to the dwarf expression.
       // Tag offset logically applies to the alloca pointer, and it makes sense
       // to put it at the beginning of the expression.
diff --git a/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp b/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp
index 5699ae0..bd4e4ef 100644
--- a/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp
+++ b/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp
@@ -87,10 +87,14 @@ void StackInfoBuilder::visit(Instruction &Inst) {
   }
   if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&Inst)) {
     for (Value *V : DVI->location_ops()) {
-      if (auto *Alloca = dyn_cast_or_null<AllocaInst>(V))
-        if (!Info.AllocaDbgMap.count(Alloca) ||
-            Info.AllocaDbgMap[Alloca].back() != DVI)
-          Info.AllocaDbgMap[Alloca].push_back(DVI);
+      if (auto *AI = dyn_cast_or_null<AllocaInst>(V)) {
+        if (!IsInterestingAlloca(*AI))
+          continue;
+        AllocaInfo &AInfo = Info.AllocasToInstrument[AI];
+        auto &DVIVec = AInfo.DbgVariableIntrinsics;
+        if (DVIVec.empty() || DVIVec.back() != DVI)
+          DVIVec.push_back(DVI);
+      }
     }
   }
   Instruction *ExitUntag = getUntagLocationIfFunctionExit(Inst);
-- 
2.7.4