[DebugInfo][RemoveDIs] Rip out the UseNewDbgInfoFormat flag

jmorse · jmorse · commit b0cf784e2bf0 · 2025-06-06T18:23:42.000+01:00
Start removing debug intrinsics support -- starting with the flag that
controls production of their replacement, debug records. This patch removes
the command-line-flag and with it the ability to switch back to intrinsics.
The module / function / block level "IsNewDbgInfoFormat" flags get
hardcoded to true, I'll to incrementally remove things that depend on those
flags.
diff --git a/llvm/include/llvm/IR/BasicBlock.h b/llvm/include/llvm/IR/BasicBlock.h
@@ -87,8 +87,7 @@ class BasicBlock final : public Value, // Basic blocks are data objects also
 
   /// Convert variable location debugging information stored in dbg.value
   /// intrinsics into DbgMarkers / DbgRecords. Deletes all dbg.values in
-  /// the process and sets IsNewDbgInfoFormat = true. Only takes effect if
-  /// the UseNewDbgInfoFormat LLVM command line option is given.
+  /// the process and sets IsNewDbgInfoFormat = true.
   LLVM_ABI void convertToNewDbgValues();
 
   /// Convert variable location debugging information stored in DbgMarkers and
diff --git a/llvm/include/llvm/IR/PassManagerImpl.h b/llvm/include/llvm/IR/PassManagerImpl.h
@@ -22,8 +22,6 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/PrettyStackTrace.h"
 
-LLVM_ABI extern llvm::cl::opt<bool> UseNewDbgInfoFormat;
-
 namespace llvm {
 
 template <typename IRUnitT, typename AnalysisManagerT, typename... ExtraArgTs>
@@ -67,7 +65,7 @@ PreservedAnalyses PassManager<IRUnitT, AnalysisManagerT, ExtraArgTs...>::run(
 
   // RemoveDIs: if requested, convert debug-info to DbgRecord representation
   // for duration of these passes.
-  ScopedDbgInfoFormatSetter FormatSetter(IR, UseNewDbgInfoFormat);
+  ScopedDbgInfoFormatSetter FormatSetter(IR, true);
 
   StackTraceEntry Entry(PI, IR);
   for (auto &Pass : Passes) {
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
@@ -64,8 +64,6 @@ static cl::opt<bool> AllowIncompleteIR(
         "Allow incomplete IR on a best effort basis (references to unknown "
         "metadata will be dropped)"));
 
-LLVM_ABI extern llvm::cl::opt<bool> UseNewDbgInfoFormat;
-
 static std::string getTypeString(Type *T) {
   std::string Result;
   raw_string_ostream Tmp(Result);
@@ -443,7 +441,7 @@ bool LLParser::validateEndOfModule(bool UpgradeDebugInfo) {
   UpgradeNVVMAnnotations(*M);
   UpgradeSectionAttributes(*M);
 
-  M->setIsNewDbgInfoFormat(UseNewDbgInfoFormat);
+  M->setIsNewDbgInfoFormat(true);
 
   if (!Slots)
     return false;
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -101,8 +101,6 @@ static cl::opt<bool> ExpandConstantExprs(
     cl::desc(
         "Expand constant expressions to instructions for testing purposes"));
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 namespace {
 
 enum {
@@ -4481,9 +4479,9 @@ Error BitcodeReader::parseGlobalIndirectSymbolRecord(
 Error BitcodeReader::parseModule(uint64_t ResumeBit,
                                  bool ShouldLazyLoadMetadata,
                                  ParserCallbacks Callbacks) {
-  // In preparation for the deletion of debug-intrinsics, don't allow module
-  // loading to escape intrinsics being autoupgraded to debug records.
-  TheModule->IsNewDbgInfoFormat = UseNewDbgInfoFormat;
+  // Don't allow modules to use debug-intrinsics: autoupgrading them is now
+  // mandatory.
+  TheModule->IsNewDbgInfoFormat = true;
 
   this->ValueTypeCallback = std::move(Callbacks.ValueType);
   if (ResumeBit) {
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -122,8 +122,6 @@ namespace llvm {
 extern FunctionSummary::ForceSummaryHotnessType ForceSummaryEdgesCold;
 }
 
-LLVM_ABI extern llvm::cl::opt<bool> UseNewDbgInfoFormat;
-
 namespace {
 
 /// These are manifest constants used by the bitcode writer. They do not need to
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -70,8 +70,6 @@ static cl::opt<bool> SimplifyMIR(
 static cl::opt<bool> PrintLocations("mir-debug-loc", cl::Hidden, cl::init(true),
                                     cl::desc("Print MIR debug-locations"));
 
-extern cl::opt<bool> UseNewDbgInfoFormat;
-
 namespace {
 
 /// This structure describes how to print out stack object references.
@@ -967,8 +965,7 @@ void MIRFormatter::printIRValue(raw_ostream &OS, const Value &V,
 }
 
 void llvm::printMIR(raw_ostream &OS, const Module &M) {
-  ScopedDbgInfoFormatSetter FormatSetter(const_cast<Module &>(M),
-                                         UseNewDbgInfoFormat);
+  ScopedDbgInfoFormatSetter FormatSetter(const_cast<Module &>(M), true);
 
   yaml::Output Out(OS);
   Out << const_cast<Module &>(M);
@@ -979,6 +976,6 @@ void llvm::printMIR(raw_ostream &OS, const MachineModuleInfo &MMI,
   // RemoveDIs: as there's no textual form for DbgRecords yet, print debug-info
   // in dbg.value format.
   ScopedDbgInfoFormatSetter FormatSetter(
-      const_cast<Function &>(MF.getFunction()), UseNewDbgInfoFormat);
+      const_cast<Function &>(MF.getFunction()), true);
   printMF(OS, MMI, MF);
 }
diff --git a/llvm/lib/IR/BasicBlock.cpp b/llvm/lib/IR/BasicBlock.cpp
@@ -31,30 +31,6 @@ using namespace llvm;
 #define DEBUG_TYPE "ir"
 STATISTIC(NumInstrRenumberings, "Number of renumberings across all blocks");
 
-// This cl-opt exists to control whether variable-location information is
-// produced using intrinsics, or whether DbgRecords are produced. However,
-// it's imminently being phased out, so give it a flag-name that is very
-// unlikely to be used anywhere.
-//
-// If you find yourself needing to use this flag for any period longer than
-// five minutes, please revert the patch making this change, and make contact
-// in this discourse post, where we can discuss any further transition work
-// that might be needed to remove debug intrinsics.
-//
-// https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578
-LLVM_ABI cl::opt<bool>
-    UseNewDbgInfoFormat("dont-pass-this-flag-please-experimental-debuginfo",
-                        cl::Hidden, cl::init(true));
-
-// This cl-opt collects the --experimental-debuginfo-iterators flag and then
-// does nothing with it (because the it gets stored into an otherwise unused
-// cl-opt), so that we can disable debug-intrinsic production without
-// immediately modifying lots of tests. If your tests break because of this
-// change, please see the next comment up.
-static cl::opt<bool> DeliberatelyUnseenDbgInfoFlag(
-    "experimental-debuginfo-iterators", cl::Hidden,
-    cl::init(true));
-
 DbgMarker *BasicBlock::createMarker(Instruction *I) {
   assert(IsNewDbgInfoFormat &&
          "Tried to create a marker in a non new debug-info block!");
@@ -187,7 +163,7 @@ template class llvm::SymbolTableListTraits<
 BasicBlock::BasicBlock(LLVMContext &C, const Twine &Name, Function *NewParent,
                        BasicBlock *InsertBefore)
     : Value(Type::getLabelTy(C), Value::BasicBlockVal),
-      IsNewDbgInfoFormat(UseNewDbgInfoFormat), Parent(nullptr) {
+      IsNewDbgInfoFormat(true), Parent(nullptr) {
 
   if (NewParent)
     insertInto(NewParent, InsertBefore);
diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
@@ -65,8 +65,6 @@ static cl::opt<int> NonGlobalValueMaxNameSize(
     "non-global-value-max-name-size", cl::Hidden, cl::init(1024),
     cl::desc("Maximum size for the name of non-global values."));
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 void Function::renumberBlocks() {
   validateBlockNumbers();
 
@@ -492,7 +490,7 @@ Function::Function(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace,
                    const Twine &name, Module *ParentModule)
     : GlobalObject(Ty, Value::FunctionVal, AllocMarker, Linkage, name,
                    computeAddrSpace(AddrSpace, ParentModule)),
-      NumArgs(Ty->getNumParams()), IsNewDbgInfoFormat(UseNewDbgInfoFormat) {
+      NumArgs(Ty->getNumParams()), IsNewDbgInfoFormat(true) {
   assert(FunctionType::isValidReturnType(getReturnType()) &&
          "invalid return type");
   setGlobalObjectSubClassData(0);
diff --git a/llvm/lib/IR/IRPrintingPasses.cpp b/llvm/lib/IR/IRPrintingPasses.cpp
@@ -24,8 +24,6 @@
 
 using namespace llvm;
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 namespace {
 
 class PrintModulePassWrapper : public ModulePass {
@@ -42,12 +40,10 @@ class PrintModulePassWrapper : public ModulePass {
         ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {}
 
   bool runOnModule(Module &M) override {
-    ScopedDbgInfoFormatSetter FormatSetter(M, UseNewDbgInfoFormat);
+    ScopedDbgInfoFormatSetter FormatSetter(M, true);
     // Remove intrinsic declarations when printing in the new format.
-    // TODO: Move this into Module::setIsNewDbgInfoFormat when we're ready to
-    // update test output.
-    if (UseNewDbgInfoFormat)
-      M.removeDebugIntrinsicDeclarations();
+    // TODO: consider removing this as debug-intrinsics are gone.
+    M.removeDebugIntrinsicDeclarations();
 
     if (llvm::isFunctionInPrintList("*")) {
       if (!Banner.empty())
@@ -88,7 +84,7 @@ class PrintFunctionPassWrapper : public FunctionPass {
 
   // This pass just prints a banner followed by the function as it's processed.
   bool runOnFunction(Function &F) override {
-    ScopedDbgInfoFormatSetter FormatSetter(F, UseNewDbgInfoFormat);
+    ScopedDbgInfoFormatSetter FormatSetter(F, true);
 
     if (isFunctionInPrintList(F.getName())) {
       if (forcePrintModuleIR())
diff --git a/llvm/lib/IR/Instruction.cpp b/llvm/lib/IR/Instruction.cpp
@@ -130,8 +130,6 @@ BasicBlock::iterator Instruction::insertInto(BasicBlock *ParentBB,
   return getIterator();
 }
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 void Instruction::insertBefore(BasicBlock &BB,
                                InstListType::iterator InsertPos) {
   assert(!DebugMarker);
diff --git a/llvm/lib/IR/LegacyPassManager.cpp b/llvm/lib/IR/LegacyPassManager.cpp
@@ -32,7 +32,6 @@
 
 using namespace llvm;
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
 // See PassManagers.h for Pass Manager infrastructure overview.
 
 //===----------------------------------------------------------------------===//
@@ -530,7 +529,7 @@ bool PassManagerImpl::run(Module &M) {
   // RemoveDIs: if a command line flag is given, convert to the
   // DbgVariableRecord representation of debug-info for the duration of these
   // passes.
-  ScopedDbgInfoFormatSetter FormatSetter(M, UseNewDbgInfoFormat);
+  ScopedDbgInfoFormatSetter FormatSetter(M, true);
 
   for (ImmutablePass *ImPass : getImmutablePasses())
     Changed |= ImPass->doInitialization(M);
diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
@@ -54,8 +54,6 @@
 
 using namespace llvm;
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 //===----------------------------------------------------------------------===//
 // Methods to implement the globals and functions lists.
 //
@@ -74,7 +72,7 @@ template class LLVM_EXPORT_TEMPLATE llvm::SymbolTableListTraits<GlobalIFunc>;
 Module::Module(StringRef MID, LLVMContext &C)
     : Context(C), ValSymTab(std::make_unique<ValueSymbolTable>(-1)),
       ModuleID(std::string(MID)), SourceFileName(std::string(MID)),
-      IsNewDbgInfoFormat(UseNewDbgInfoFormat) {
+      IsNewDbgInfoFormat(true) {
   Context.addModule(this);
 }
 
diff --git a/llvm/lib/IRPrinter/IRPrintingPasses.cpp b/llvm/lib/IRPrinter/IRPrintingPasses.cpp
@@ -23,8 +23,6 @@
 
 using namespace llvm;
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 PrintModulePass::PrintModulePass() : OS(dbgs()) {}
 PrintModulePass::PrintModulePass(raw_ostream &OS, const std::string &Banner,
                                  bool ShouldPreserveUseListOrder,
@@ -34,12 +32,10 @@ PrintModulePass::PrintModulePass(raw_ostream &OS, const std::string &Banner,
       EmitSummaryIndex(EmitSummaryIndex) {}
 
 PreservedAnalyses PrintModulePass::run(Module &M, ModuleAnalysisManager &AM) {
-  ScopedDbgInfoFormatSetter FormatSetter(M, UseNewDbgInfoFormat);
+  ScopedDbgInfoFormatSetter FormatSetter(M, true);
   // Remove intrinsic declarations when printing in the new format.
-  // TODO: Move this into Module::setIsNewDbgInfoFormat when we're ready to
-  // update test output.
-  if (UseNewDbgInfoFormat)
-    M.removeDebugIntrinsicDeclarations();
+  // TODO: consider removing this now that debug intrinsics are gone.
+  M.removeDebugIntrinsicDeclarations();
 
   if (llvm::isFunctionInPrintList("*")) {
     if (!Banner.empty())
@@ -76,7 +72,7 @@ PrintFunctionPass::PrintFunctionPass(raw_ostream &OS, const std::string &Banner)
 
 PreservedAnalyses PrintFunctionPass::run(Function &F,
                                          FunctionAnalysisManager &) {
-  ScopedDbgInfoFormatSetter FormatSetter(F, UseNewDbgInfoFormat);
+  ScopedDbgInfoFormatSetter FormatSetter(F, true);
 
   if (isFunctionInPrintList(F.getName())) {
     if (forcePrintModuleIR())
diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
@@ -70,8 +70,6 @@ using namespace object;
 
 #define DEBUG_TYPE "lto"
 
-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;
-
 static cl::opt<bool>
     DumpThinCGSCCs("dump-thin-cg-sccs", cl::init(false), cl::Hidden,
                    cl::desc("Dump the SCCs in the ThinLTO index's callgraph"));
@@ -602,7 +600,7 @@ LTO::RegularLTOState::RegularLTOState(unsigned ParallelCodeGenParallelismLevel,
     : ParallelCodeGenParallelismLevel(ParallelCodeGenParallelismLevel),
       Ctx(Conf), CombinedModule(std::make_unique<Module>("ld-temp.o", Ctx)),
       Mover(std::make_unique<IRMover>(*CombinedModule)) {
-  CombinedModule->IsNewDbgInfoFormat = UseNewDbgInfoFormat;
+  CombinedModule->IsNewDbgInfoFormat = true;
 }
 
 LTO::ThinLTOState::ThinLTOState(ThinBackend BackendParam)
diff --git a/llvm/lib/Transforms/Coroutines/CoroFrame.cpp b/llvm/lib/Transforms/Coroutines/CoroFrame.cpp
@@ -41,8 +41,6 @@
 
 using namespace llvm;
 
-extern cl::opt<bool> UseNewDbgInfoFormat;
-
 #define DEBUG_TYPE "coro-frame"
 
 namespace {
@@ -842,18 +840,12 @@ static void buildFrameDebugInfo(Function &F, coro::Shape &Shape,
       DILocation::get(DIS->getContext(), LineNum, /*Column=*/1, DIS);
   assert(FrameDIVar->isValidLocationForIntrinsic(DILoc));
 
-  if (UseNewDbgInfoFormat) {
-    DbgVariableRecord *NewDVR =
-        new DbgVariableRecord(ValueAsMetadata::get(Shape.FramePtr), FrameDIVar,
-                              DBuilder.createExpression(), DILoc,
-                              DbgVariableRecord::LocationType::Declare);
-    BasicBlock::iterator It = Shape.getInsertPtAfterFramePtr();
-    It->getParent()->insertDbgRecordBefore(NewDVR, It);
-  } else {
-    DBuilder.insertDeclare(Shape.FramePtr, FrameDIVar,
-                           DBuilder.createExpression(), DILoc,
-                           Shape.getInsertPtAfterFramePtr());
-  }
+  DbgVariableRecord *NewDVR =
+      new DbgVariableRecord(ValueAsMetadata::get(Shape.FramePtr), FrameDIVar,
+                            DBuilder.createExpression(), DILoc,
+                            DbgVariableRecord::LocationType::Declare);
+  BasicBlock::iterator It = Shape.getInsertPtAfterFramePtr();
+  It->getParent()->insertDbgRecordBefore(NewDVR, It);
 }
 
 // Build a struct that will keep state for an active coroutine.
@@ -1136,19 +1128,12 @@ static void insertSpills(const FrameDataInfo &FrameData, coro::Shape &Shape) {
           // This dbg.declare is preserved for all coro-split function
           // fragments. It will be unreachable in the main function, and
           // processed by coro::salvageDebugInfo() by the Cloner.
-          if (UseNewDbgInfoFormat) {
-            DbgVariableRecord *NewDVR = new DbgVariableRecord(
-                ValueAsMetadata::get(CurrentReload), DDI->getVariable(),
-                DDI->getExpression(), DDI->getDebugLoc(),
-                DbgVariableRecord::LocationType::Declare);
-            Builder.GetInsertPoint()->getParent()->insertDbgRecordBefore(
-                NewDVR, Builder.GetInsertPoint());
-          } else {
-            DIBuilder(*CurrentBlock->getParent()->getParent(), AllowUnresolved)
-                .insertDeclare(CurrentReload, DDI->getVariable(),
-                               DDI->getExpression(), DDI->getDebugLoc(),
-                               Builder.GetInsertPoint());
-          }
+          DbgVariableRecord *NewDVR = new DbgVariableRecord(
+              ValueAsMetadata::get(CurrentReload), DDI->getVariable(),
+              DDI->getExpression(), DDI->getDebugLoc(),
+              DbgVariableRecord::LocationType::Declare);
+          Builder.GetInsertPoint()->getParent()->insertDbgRecordBefore(
+              NewDVR, Builder.GetInsertPoint());
           // This dbg.declare is for the main function entry point.  It
           // will be deleted in all coro-split functions.
           coro::salvageDebugInfo(ArgToAllocaMap, *DDI, false /*UseEntryValue*/);
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
@@ -88,8 +88,6 @@
 using namespace llvm;
 using namespace llvm::PatternMatch;
 
-extern cl::opt<bool> UseNewDbgInfoFormat;
-
 #define DEBUG_TYPE "local"
 
 STATISTIC(NumRemoved, "Number of unreachable basic blocks removed");
@@ -1691,16 +1689,10 @@ static void insertDbgValueOrDbgVariableRecord(DIBuilder &Builder, Value *DV,
                                               DIExpression *DIExpr,
                                               const DebugLoc &NewLoc,
                                               BasicBlock::iterator Instr) {
-  if (!UseNewDbgInfoFormat) {
-    Builder.insertDbgValueIntrinsic(DV, DIVar, DIExpr, NewLoc, Instr);
-  } else {
-    // RemoveDIs: if we're using the new debug-info format, allocate a
-    // DbgVariableRecord directly instead of a dbg.value intrinsic.
-    ValueAsMetadata *DVAM = ValueAsMetadata::get(DV);
-    DbgVariableRecord *DV =
-        new DbgVariableRecord(DVAM, DIVar, DIExpr, NewLoc.get());
-    Instr->getParent()->insertDbgRecordBefore(DV, Instr);
-  }
+  ValueAsMetadata *DVAM = ValueAsMetadata::get(DV);
+  DbgVariableRecord *DVRec =
+      new DbgVariableRecord(DVAM, DIVar, DIExpr, NewLoc.get());
+  Instr->getParent()->insertDbgRecordBefore(DVRec, Instr);
 }
 
 static void insertDbgValueOrDbgVariableRecordAfter(
@@ -1838,7 +1830,6 @@ void llvm::ConvertDebugDeclareToDebugValue(DbgVariableRecord *DVR,
   // then we want to insert a dbg.value for the corresponding fragment.
   LLVM_DEBUG(dbgs() << "Failed to convert dbg.declare to dbg.value: " << *DVR
                     << '\n');
-  assert(UseNewDbgInfoFormat);
 
   // For now, when there is a store to parts of the variable (but we do not
   // know which part) we insert an dbg.value intrinsic to indicate that we
@@ -1919,7 +1910,6 @@ void llvm::ConvertDebugDeclareToDebugValue(DbgVariableRecord *DVR, LoadInst *LI,
   // future if multi-location support is added to the IR, it might be
   // preferable to keep tracking both the loaded value and the original
   // address in case the alloca can not be elided.
-  assert(UseNewDbgInfoFormat);
 
   // Create a DbgVariableRecord directly and insert.
   ValueAsMetadata *LIVAM = ValueAsMetadata::get(LI);
diff --git a/llvm/tools/llvm-as/llvm-as.cpp b/llvm/tools/llvm-as/llvm-as.cpp
diff --git a/llvm/tools/llvm-dis/llvm-dis.cpp b/llvm/tools/llvm-dis/llvm-dis.cpp
diff --git a/llvm/tools/llvm-link/llvm-link.cpp b/llvm/tools/llvm-link/llvm-link.cpp
diff --git a/llvm/unittests/Analysis/IRSimilarityIdentifierTest.cpp b/llvm/unittests/Analysis/IRSimilarityIdentifierTest.cpp
diff --git a/llvm/unittests/IR/DebugInfoTest.cpp b/llvm/unittests/IR/DebugInfoTest.cpp
diff --git a/llvm/unittests/IR/InstructionsTest.cpp b/llvm/unittests/IR/InstructionsTest.cpp
diff --git a/llvm/unittests/IR/ValueTest.cpp b/llvm/unittests/IR/ValueTest.cpp

Original file line number	Diff line number	Diff line change
`@@ -122,8 +122,6 @@ namespace llvm {`
`122`	`122`	`extern FunctionSummary::ForceSummaryHotnessType ForceSummaryEdgesCold;`
`123`	`123`	`}`
`124`	`124`
`125`		`-LLVM_ABI extern llvm::cl::opt<bool> UseNewDbgInfoFormat;`
`126`		`-`
`127`	`125`	`namespace {`
`128`	`126`
`129`	`127`	`/// These are manifest constants used by the bitcode writer. They do not need to`
Original file line number	Diff line number	Diff line change
`@@ -130,8 +130,6 @@ BasicBlock::iterator Instruction::insertInto(BasicBlock *ParentBB,`
`130`	`130`	`return getIterator();`
`131`	`131`	`}`
`132`	`132`
`133`		`-LLVM_ABI extern cl::opt<bool> UseNewDbgInfoFormat;`
`134`		`-`
`135`	`133`	`void Instruction::insertBefore(BasicBlock &BB,`
`136`	`134`	`InstListType::iterator InsertPos) {`
`137`	`135`	`assert(!DebugMarker);`