From 77fc4c146f0870ffb09c1afb823ccbe742c5e6ff Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 25 Dec 2021 23:30:44 +0100
Subject: Vendor import of llvm-project main
 llvmorg-14-init-13186-g0c553cc1af2e.

---
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 35 +++++++++++++++++++------------
 1 file changed, 22 insertions(+), 13 deletions(-)

(limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 993cb1de8c02..f5a878f8788a 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -488,6 +488,7 @@ class BitcodeReader : public BitcodeReaderBase, public GVMaterializer {
   BitcodeReaderValueList ValueList;
   Optional<MetadataLoader> MDLoader;
   std::vector<Comdat *> ComdatList;
+  DenseSet<GlobalObject *> ImplicitComdatObjects;
   SmallVector<Instruction *, 64> InstructionList;
 
   std::vector<std::pair<GlobalVariable *, unsigned>> GlobalInits;
@@ -932,6 +933,7 @@ static FunctionSummary::FFlags getDecodedFFlags(uint64_t RawFlags) {
   Flags.NoUnwind = (RawFlags >> 6) & 0x1;
   Flags.MayThrow = (RawFlags >> 7) & 0x1;
   Flags.HasUnknownCall = (RawFlags >> 8) & 0x1;
+  Flags.MustBeUnreachable = (RawFlags >> 9) & 0x1;
   return Flags;
 }
 
@@ -2037,14 +2039,8 @@ Expected<Value *> BitcodeReader::recordValue(SmallVectorImpl<uint64_t> &Record,
     return error("Invalid value name");
   V->setName(NameStr);
   auto *GO = dyn_cast<GlobalObject>(V);
-  if (GO) {
-    if (GO->getComdat() == reinterpret_cast<Comdat *>(1)) {
-      if (TT.supportsCOMDAT())
-        GO->setComdat(TheModule->getOrInsertComdat(V->getName()));
-      else
-        GO->setComdat(nullptr);
-    }
-  }
+  if (GO && ImplicitComdatObjects.contains(GO) && TT.supportsCOMDAT())
+    GO->setComdat(TheModule->getOrInsertComdat(V->getName()));
   return V;
 }
 
@@ -2942,6 +2938,19 @@ Error BitcodeReader::parseConstants() {
       V = DSOLocalEquivalent::get(GV);
       break;
     }
+    case bitc::CST_CODE_NO_CFI_VALUE: {
+      if (Record.size() < 2)
+        return error("Invalid record");
+      Type *GVTy = getTypeByID(Record[0]);
+      if (!GVTy)
+        return error("Invalid record");
+      GlobalValue *GV = dyn_cast_or_null<GlobalValue>(
+          ValueList.getConstantFwdRef(Record[1], GVTy));
+      if (!GV)
+        return error("Invalid record");
+      V = NoCFIValue::get(GV);
+      break;
+    }
     }
 
     ValueList.assignValue(V, NextCstNo);
@@ -3292,7 +3301,7 @@ Error BitcodeReader::parseGlobalVarRecord(ArrayRef<uint64_t> Record) {
       NewGV->setComdat(ComdatList[ComdatID - 1]);
     }
   } else if (hasImplicitComdat(RawLinkage)) {
-    NewGV->setComdat(reinterpret_cast<Comdat *>(1));
+    ImplicitComdatObjects.insert(NewGV);
   }
 
   if (Record.size() > 12) {
@@ -3426,7 +3435,7 @@ Error BitcodeReader::parseFunctionRecord(ArrayRef<uint64_t> Record) {
       Func->setComdat(ComdatList[ComdatID - 1]);
     }
   } else if (hasImplicitComdat(RawLinkage)) {
-    Func->setComdat(reinterpret_cast<Comdat *>(1));
+    ImplicitComdatObjects.insert(Func);
   }
 
   if (Record.size() > 13)
@@ -6733,10 +6742,10 @@ llvm::getBitcodeFileContents(MemoryBufferRef Buffer) {
         // not have its own string table. A bitcode file may have multiple
         // string tables if it was created by binary concatenation, for example
         // with "llvm-cat -b".
-        for (auto I = F.Mods.rbegin(), E = F.Mods.rend(); I != E; ++I) {
-          if (!I->Strtab.empty())
+        for (BitcodeModule &I : llvm::reverse(F.Mods)) {
+          if (!I.Strtab.empty())
             break;
-          I->Strtab = *Strtab;
+          I.Strtab = *Strtab;
         }
         // Similarly, the string table is used by every preceding symbol table;
         // normally there will be just one unless the bitcode file was created
-- 
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