[DebugInfo][RemoveDIs] Rip out the UseNewDbgInfoFormat flag (#143207)

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.

Author: jmorse

clang/test/CodeGenCXX/tmp-md-nodes2.cpp

@@ -1,8 +1,6 @@
 // REQUIRES: asserts
 // RUN: %clang_cc1 -O0 -triple %itanium_abi_triple -debug-info-kind=limited -emit-llvm %s -o - | \
 // RUN: FileCheck %s
-// RUN: %clang_cc1 -O0 -triple %itanium_abi_triple -debug-info-kind=limited -emit-llvm -mllvm --experimental-debuginfo-iterators=true %s -o - | \
-// RUN: FileCheck %s
 
 // This test simply checks that the varargs thunk is created. The failing test
 // case asserts.

flang/test/Integration/debug-local-var-2.f90

@@ -1,6 +1,5 @@
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=standalone %s -mllvm --experimental-debuginfo-iterators=true -o - | FileCheck %s --check-prefixes=BOTH,RECORDS
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -mllvm --experimental-debuginfo-iterators=false -o - | FileCheck --check-prefix=LINEONLY %s
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -mllvm --experimental-debuginfo-iterators=true -o - | FileCheck --check-prefix=LINEONLY %s
+! RUN: %flang_fc1 -emit-llvm -debug-info-kind=standalone %s -o - | FileCheck %s --check-prefixes=BOTH,RECORDS
+! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -o - | FileCheck --check-prefix=LINEONLY %s
 
 ! This tests checks the debug information for local variables in llvm IR.
 

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

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) {

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;

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) {

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

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);
 }

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);

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);