//===- llvm/unittest/IR/DebugInfo.cpp - DebugInfo tests -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/IR/DebugInfo.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Transforms/Utils/Local.h"
#include "gtest/gtest.h"

using namespace llvm;

static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
  SMDiagnostic Err;
  std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
  if (!Mod)
    Err.print("DebugInfoTest", errs());
  return Mod;
}

namespace {

TEST(DINodeTest, getFlag) {
  // Some valid flags.
  EXPECT_EQ(DINode::FlagPublic, DINode::getFlag("DIFlagPublic"));
  EXPECT_EQ(DINode::FlagProtected, DINode::getFlag("DIFlagProtected"));
  EXPECT_EQ(DINode::FlagPrivate, DINode::getFlag("DIFlagPrivate"));
  EXPECT_EQ(DINode::FlagVector, DINode::getFlag("DIFlagVector"));
  EXPECT_EQ(DINode::FlagRValueReference,
            DINode::getFlag("DIFlagRValueReference"));

  // FlagAccessibility shouldn't work.
  EXPECT_EQ(0u, DINode::getFlag("DIFlagAccessibility"));

  // Some other invalid strings.
  EXPECT_EQ(0u, DINode::getFlag("FlagVector"));
  EXPECT_EQ(0u, DINode::getFlag("Vector"));
  EXPECT_EQ(0u, DINode::getFlag("other things"));
  EXPECT_EQ(0u, DINode::getFlag("DIFlagOther"));
}

TEST(DINodeTest, getFlagString) {
  // Some valid flags.
  EXPECT_EQ(StringRef("DIFlagPublic"),
            DINode::getFlagString(DINode::FlagPublic));
  EXPECT_EQ(StringRef("DIFlagProtected"),
            DINode::getFlagString(DINode::FlagProtected));
  EXPECT_EQ(StringRef("DIFlagPrivate"),
            DINode::getFlagString(DINode::FlagPrivate));
  EXPECT_EQ(StringRef("DIFlagVector"),
            DINode::getFlagString(DINode::FlagVector));
  EXPECT_EQ(StringRef("DIFlagRValueReference"),
            DINode::getFlagString(DINode::FlagRValueReference));

  // FlagAccessibility actually equals FlagPublic.
  EXPECT_EQ(StringRef("DIFlagPublic"),
            DINode::getFlagString(DINode::FlagAccessibility));

  // Some other invalid flags.
  EXPECT_EQ(StringRef(),
            DINode::getFlagString(DINode::FlagPublic | DINode::FlagVector));
  EXPECT_EQ(StringRef(), DINode::getFlagString(DINode::FlagFwdDecl |
                                               DINode::FlagArtificial));
  EXPECT_EQ(StringRef(),
            DINode::getFlagString(static_cast<DINode::DIFlags>(0xffff)));
}

TEST(DINodeTest, splitFlags) {
// Some valid flags.
#define CHECK_SPLIT(FLAGS, VECTOR, REMAINDER)                                  \
  {                                                                            \
    SmallVector<DINode::DIFlags, 8> V;                                         \
    EXPECT_EQ(REMAINDER, DINode::splitFlags(FLAGS, V));                        \
    EXPECT_TRUE(makeArrayRef(V).equals(VECTOR));                               \
  }
  CHECK_SPLIT(DINode::FlagPublic, {DINode::FlagPublic}, DINode::FlagZero);
  CHECK_SPLIT(DINode::FlagProtected, {DINode::FlagProtected}, DINode::FlagZero);
  CHECK_SPLIT(DINode::FlagPrivate, {DINode::FlagPrivate}, DINode::FlagZero);
  CHECK_SPLIT(DINode::FlagVector, {DINode::FlagVector}, DINode::FlagZero);
  CHECK_SPLIT(DINode::FlagRValueReference, {DINode::FlagRValueReference},
              DINode::FlagZero);
  DINode::DIFlags Flags[] = {DINode::FlagFwdDecl, DINode::FlagVector};
  CHECK_SPLIT(DINode::FlagFwdDecl | DINode::FlagVector, Flags,
              DINode::FlagZero);
  CHECK_SPLIT(DINode::FlagZero, {}, DINode::FlagZero);
#undef CHECK_SPLIT
}

TEST(StripTest, LoopMetadata) {
  LLVMContext C;
  std::unique_ptr<Module> M = parseIR(C, R"(
    define void @f() !dbg !5 {
      ret void, !dbg !10, !llvm.loop !11
    }

    !llvm.dbg.cu = !{!0}
    !llvm.debugify = !{!3, !3}
    !llvm.module.flags = !{!4}

    !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
    !1 = !DIFile(filename: "loop.ll", directory: "/")
    !2 = !{}
    !3 = !{i32 1}
    !4 = !{i32 2, !"Debug Info Version", i32 3}
    !5 = distinct !DISubprogram(name: "f", linkageName: "f", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !7)
    !6 = !DISubroutineType(types: !2)
    !7 = !{!8}
    !8 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !9)
    !9 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
    !10 = !DILocation(line: 1, column: 1, scope: !5)
    !11 = distinct !{!11, !10, !10}
)");

  // Look up the debug info emission kind for the CU via the loop metadata
  // attached to the terminator. If, when stripping non-line table debug info,
  // we update the terminator's metadata correctly, we should be able to
  // observe the change in emission kind for the CU.
  auto getEmissionKind = [&]() {
    Instruction &I = *M->getFunction("f")->getEntryBlock().getFirstNonPHI();
    MDNode *LoopMD = I.getMetadata(LLVMContext::MD_loop);
    return cast<DILocation>(LoopMD->getOperand(1))
        ->getScope()
        ->getSubprogram()
        ->getUnit()
        ->getEmissionKind();
  };

  EXPECT_EQ(getEmissionKind(), DICompileUnit::FullDebug);

  bool Changed = stripNonLineTableDebugInfo(*M);
  EXPECT_TRUE(Changed);

  EXPECT_EQ(getEmissionKind(), DICompileUnit::LineTablesOnly);

  bool BrokenDebugInfo = false;
  bool HardError = verifyModule(*M, &errs(), &BrokenDebugInfo);
  EXPECT_FALSE(HardError);
  EXPECT_FALSE(BrokenDebugInfo);
}

TEST(MetadataTest, DeleteInstUsedByDbgValue) {
  LLVMContext C;
  std::unique_ptr<Module> M = parseIR(C, R"(
    define i16 @f(i16 %a) !dbg !6 {
      %b = add i16 %a, 1, !dbg !11
      call void @llvm.dbg.value(metadata i16 %b, metadata !9, metadata !DIExpression()), !dbg !11
      ret i16 0, !dbg !11
    }
    declare void @llvm.dbg.value(metadata, metadata, metadata) #0
    attributes #0 = { nounwind readnone speculatable willreturn }

    !llvm.dbg.cu = !{!0}
    !llvm.module.flags = !{!5}

    !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
    !1 = !DIFile(filename: "t.ll", directory: "/")
    !2 = !{}
    !5 = !{i32 2, !"Debug Info Version", i32 3}
    !6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
    !7 = !DISubroutineType(types: !2)
    !8 = !{!9}
    !9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
    !10 = !DIBasicType(name: "ty16", size: 16, encoding: DW_ATE_unsigned)
    !11 = !DILocation(line: 1, column: 1, scope: !6)
)");

  // Find %b = add ...
  Instruction &I = *M->getFunction("f")->getEntryBlock().getFirstNonPHI();

  // Find the dbg.value using %b.
  SmallVector<DbgValueInst *, 1> DVIs;
  findDbgValues(DVIs, &I);

  // Delete %b. The dbg.value should now point to undef.
  I.eraseFromParent();
  EXPECT_EQ(DVIs[0]->getNumVariableLocationOps(), 1u);
  EXPECT_TRUE(isa<UndefValue>(DVIs[0]->getValue(0)));
}

TEST(DIBuilder, CreateFortranArrayTypeWithAttributes) {
  LLVMContext Ctx;
  std::unique_ptr<Module> M(new Module("MyModule", Ctx));
  DIBuilder DIB(*M);

  DISubrange *Subrange = DIB.getOrCreateSubrange(1,1);
  SmallVector<Metadata*, 4> Subranges;
  Subranges.push_back(Subrange);
  DINodeArray Subscripts = DIB.getOrCreateArray(Subranges);

  auto getDIExpression = [&DIB](int offset) {
    SmallVector<uint64_t, 4> ops;
    ops.push_back(llvm::dwarf::DW_OP_push_object_address);
    DIExpression::appendOffset(ops, offset);
    ops.push_back(llvm::dwarf::DW_OP_deref);

    return DIB.createExpression(ops);
  };

  DIFile *F = DIB.createFile("main.c", "/");
  DICompileUnit *CU = DIB.createCompileUnit(
      dwarf::DW_LANG_C, DIB.createFile("main.c", "/"), "llvm-c", true, "", 0);

  DIVariable *DataLocation =
      DIB.createTempGlobalVariableFwdDecl(CU, "dl", "_dl", F, 1, nullptr, true);
  DIExpression *Associated = getDIExpression(1);
  DIExpression *Allocated = getDIExpression(2);
  DIExpression *Rank = DIB.createConstantValueExpression(3);

  DICompositeType *ArrayType = DIB.createArrayType(0, 0, nullptr, Subscripts,
                                                   DataLocation, Associated,
                                                   Allocated, Rank);

  EXPECT_TRUE(isa_and_nonnull<DICompositeType>(ArrayType));
  EXPECT_EQ(ArrayType->getRawDataLocation(), DataLocation);
  EXPECT_EQ(ArrayType->getRawAssociated(), Associated);
  EXPECT_EQ(ArrayType->getRawAllocated(), Allocated);
  EXPECT_EQ(ArrayType->getRawRank(), Rank);

  // Avoid memory leak.
  DIVariable::deleteTemporary(DataLocation);
}

TEST(DIBuilder, CreateSetType) {
  LLVMContext Ctx;
  std::unique_ptr<Module> M(new Module("MyModule", Ctx));
  DIBuilder DIB(*M);
  DIScope *Scope = DISubprogram::getDistinct(
      Ctx, nullptr, "", "", nullptr, 0, nullptr, 0, nullptr, 0, 0,
      DINode::FlagZero, DISubprogram::SPFlagZero, nullptr);
  DIType *Type = DIB.createBasicType("Int", 64, dwarf::DW_ATE_signed);
  DIFile *F = DIB.createFile("main.c", "/");

  DIDerivedType *SetType = DIB.createSetType(Scope, "set1", F, 1, 64, 64, Type);
  EXPECT_TRUE(isa_and_nonnull<DIDerivedType>(SetType));
}

TEST(DIBuilder, CreateStringType) {
  LLVMContext Ctx;
  std::unique_ptr<Module> M(new Module("MyModule", Ctx));
  DIBuilder DIB(*M);
  DIScope *Scope = DISubprogram::getDistinct(
      Ctx, nullptr, "", "", nullptr, 0, nullptr, 0, nullptr, 0, 0,
      DINode::FlagZero, DISubprogram::SPFlagZero, nullptr);
  DIFile *F = DIB.createFile("main.c", "/");
  StringRef StrName = "string";
  DIVariable *StringLen = DIB.createAutoVariable(Scope, StrName, F, 0, nullptr,
                                                 false, DINode::FlagZero, 0);
  auto getDIExpression = [&DIB](int offset) {
    SmallVector<uint64_t, 4> ops;
    ops.push_back(llvm::dwarf::DW_OP_push_object_address);
    DIExpression::appendOffset(ops, offset);
    ops.push_back(llvm::dwarf::DW_OP_deref);

    return DIB.createExpression(ops);
  };
  DIExpression *StringLocationExp = getDIExpression(1);
  DIStringType *StringType =
      DIB.createStringType(StrName, StringLen, StringLocationExp);

  EXPECT_TRUE(isa_and_nonnull<DIStringType>(StringType));
  EXPECT_EQ(StringType->getName(), StrName);
  EXPECT_EQ(StringType->getStringLength(), StringLen);
  EXPECT_EQ(StringType->getStringLocationExp(), StringLocationExp);

  StringRef StrNameExp = "stringexp";
  DIExpression *StringLengthExp = getDIExpression(2);
  DIStringType *StringTypeExp =
      DIB.createStringType(StrNameExp, StringLengthExp, StringLocationExp);

  EXPECT_TRUE(isa_and_nonnull<DIStringType>(StringTypeExp));
  EXPECT_EQ(StringTypeExp->getName(), StrNameExp);
  EXPECT_EQ(StringTypeExp->getStringLocationExp(), StringLocationExp);
  EXPECT_EQ(StringTypeExp->getStringLengthExp(), StringLengthExp);
}

TEST(DIBuilder, DIEnumerator) {
  LLVMContext Ctx;
  std::unique_ptr<Module> M(new Module("MyModule", Ctx));
  DIBuilder DIB(*M);
  APSInt I1(APInt(32, 1));
  APSInt I2(APInt(33, 1));

  auto *E = DIEnumerator::get(Ctx, I1, I1.isSigned(), "name");
  EXPECT_TRUE(E);

  auto *E1 = DIEnumerator::getIfExists(Ctx, I1, I1.isSigned(), "name");
  EXPECT_TRUE(E1);

  auto *E2 = DIEnumerator::getIfExists(Ctx, I2, I1.isSigned(), "name");
  EXPECT_FALSE(E2);
}

TEST(DIBuilder, createDbgAddr) {
  LLVMContext C;
  std::unique_ptr<Module> M = parseIR(C, R"(
    define void @f() !dbg !6 {
      %a = alloca i16, align 8
      ;; It is important that we put the debug marker on the return.
      ;; We take advantage of that to conjure up a debug loc without
      ;; having to synthesize one programatically.
      ret void, !dbg !11
    }
    declare void @llvm.dbg.value(metadata, metadata, metadata) #0
    attributes #0 = { nounwind readnone speculatable willreturn }

    !llvm.dbg.cu = !{!0}
    !llvm.module.flags = !{!5}

    !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
    !1 = !DIFile(filename: "t.ll", directory: "/")
    !2 = !{}
    !5 = !{i32 2, !"Debug Info Version", i32 3}
    !6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
    !7 = !DISubroutineType(types: !2)
    !8 = !{!9}
    !9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
    !10 = !DIBasicType(name: "ty16", size: 16, encoding: DW_ATE_unsigned)
    !11 = !DILocation(line: 1, column: 1, scope: !6)
)");
  auto *F = M->getFunction("f");
  auto *EntryBlock = &F->getEntryBlock();

  auto *CU =
      cast<DICompileUnit>(M->getNamedMetadata("llvm.dbg.cu")->getOperand(0));
  auto *Alloca = &*EntryBlock->begin();
  auto *Ret = EntryBlock->getTerminator();

  auto *SP = cast<DISubprogram>(F->getMetadata(LLVMContext::MD_dbg));
  auto *File = SP->getFile();
  std::string Name = "myName";
  const auto *Loc = Ret->getDebugLoc().get();

  IRBuilder<> Builder(EntryBlock);
  DIBuilder DIB(*M, true, CU);
  DIType *DT = DIB.createBasicType("ty16", 16, dwarf::DW_ATE_unsigned);

  DILocalVariable *LocalVar =
      DIB.createAutoVariable(SP, Name, File, 5 /*line*/, DT,
                             /*AlwaysPreserve=*/true);

  auto *Inst = DIB.insertDbgAddrIntrinsic(Alloca, LocalVar,
                                          DIB.createExpression(), Loc, Ret);

  DIB.finalize();

  EXPECT_EQ(Inst->getDebugLoc().get(), Loc);

  auto *MD0 = cast<MetadataAsValue>(Inst->getOperand(0))->getMetadata();
  auto *MD0Local = cast<LocalAsMetadata>(MD0);
  EXPECT_EQ(MD0Local->getValue(), Alloca);
  auto *MD1 = cast<MetadataAsValue>(Inst->getOperand(1))->getMetadata();
  EXPECT_EQ(MD1->getMetadataID(), Metadata::MetadataKind::DILocalVariableKind);
  auto *MD2 = cast<MetadataAsValue>(Inst->getOperand(2))->getMetadata();
  auto *MDExp = cast<DIExpression>(MD2);
  EXPECT_EQ(MDExp->getNumElements(), 0u);
}

TEST(AssignmentTrackingTest, Utils) {
  // Test the assignment tracking utils defined in DebugInfo.h namespace at {}.
  // This includes:
  //     getAssignmentInsts
  //     getAssignmentMarkers
  //     RAUW
  //     deleteAll
  //
  // The input IR includes two functions, fun1 and fun2. Both contain an alloca
  // with a DIAssignID tag. fun1's alloca is linked to two llvm.dbg.assign
  // intrinsics, one of which is for an inlined variable and appears before the
  // alloca.

  LLVMContext C;
  std::unique_ptr<Module> M = parseIR(C, R"(
    define dso_local void @fun1() !dbg !7 {
    entry:
      call void @llvm.dbg.assign(metadata i32 undef, metadata !10, metadata !DIExpression(), metadata !12, metadata i32 undef, metadata !DIExpression()), !dbg !13
      %local = alloca i32, align 4, !DIAssignID !12
      call void @llvm.dbg.assign(metadata i32 undef, metadata !16, metadata !DIExpression(), metadata !12, metadata i32 undef, metadata !DIExpression()), !dbg !15
      ret void, !dbg !15
    }

    define dso_local void @fun2() !dbg !17 {
    entry:
      %local = alloca i32, align 4, !DIAssignID !20
      call void @llvm.dbg.assign(metadata i32 undef, metadata !18, metadata !DIExpression(), metadata !20, metadata i32 undef, metadata !DIExpression()), !dbg !19
      ret void, !dbg !19
    }

    declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)

    !llvm.dbg.cu = !{!0}
    !llvm.module.flags = !{!3, !4, !5}
    !llvm.ident = !{!6}

    !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
    !1 = !DIFile(filename: "test.c", directory: "/")
    !2 = !{}
    !3 = !{i32 7, !"Dwarf Version", i32 4}
    !4 = !{i32 2, !"Debug Info Version", i32 3}
    !5 = !{i32 1, !"wchar_size", i32 4}
    !6 = !{!"clang version 14.0.0"}
    !7 = distinct !DISubprogram(name: "fun1", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
    !8 = !DISubroutineType(types: !9)
    !9 = !{null}
    !10 = !DILocalVariable(name: "local3", scope: !14, file: !1, line: 2, type: !11)
    !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
    !12 = distinct !DIAssignID()
    !13 = !DILocation(line: 5, column: 1, scope: !14, inlinedAt: !15)
    !14 = distinct !DISubprogram(name: "inline", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
    !15 = !DILocation(line: 3, column: 1, scope: !7)
    !16 = !DILocalVariable(name: "local1", scope: !7, file: !1, line: 2, type: !11)
    !17 = distinct !DISubprogram(name: "fun2", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
    !18 = !DILocalVariable(name: "local2", scope: !17, file: !1, line: 2, type: !11)
    !19 = !DILocation(line: 4, column: 1, scope: !17)
    !20 = distinct !DIAssignID()
    )");

  // Check the test IR isn't malformed.
  ASSERT_TRUE(M);

  Function &Fun1 = *M->getFunction("fun1");
  Instruction &Alloca = *Fun1.getEntryBlock().getFirstNonPHIOrDbg();

  // 1. Check the Instruction <-> Intrinsic mappings work in fun1.
  //
  // Check there are two llvm.dbg.assign intrinsics linked to Alloca.
  auto CheckFun1Mapping = [&Alloca]() {
    auto Markers = at::getAssignmentMarkers(&Alloca);
    EXPECT_TRUE(std::distance(Markers.begin(), Markers.end()) == 2);
    // Check those two entries are distinct.
    DbgAssignIntrinsic *First = *Markers.begin();
    DbgAssignIntrinsic *Second = *std::next(Markers.begin());
    EXPECT_NE(First, Second);

    // Check that we can get back to Alloca from each llvm.dbg.assign.
    for (auto *DAI : Markers) {
      auto Insts = at::getAssignmentInsts(DAI);
      // Check there is exactly one instruction linked to each intrinsic. Use
      // ASSERT_TRUE because we're going to dereference the begin iterator.
      ASSERT_TRUE(std::distance(Insts.begin(), Insts.end()) == 1);
      EXPECT_FALSE(Insts.empty());
      // Check the linked instruction is Alloca.
      Instruction *LinkedInst = *Insts.begin();
      EXPECT_EQ(LinkedInst, &Alloca);
    }
  };
  CheckFun1Mapping();

  // 2. Check DIAssignID RAUW replaces attachments and uses.
  //
  DIAssignID *Old =
      cast_or_null<DIAssignID>(Alloca.getMetadata(LLVMContext::MD_DIAssignID));
  DIAssignID *New = DIAssignID::getDistinct(C);
  ASSERT_TRUE(Old && New && New != Old);
  at::RAUW(Old, New);
  // Check fun1's alloca and intrinsics have been updated and the mapping still
  // works.
  EXPECT_EQ(New, cast_or_null<DIAssignID>(
                     Alloca.getMetadata(LLVMContext::MD_DIAssignID)));
  CheckFun1Mapping();

  // Check that fun2's alloca and intrinsic have not not been updated.
  Instruction &Fun2Alloca =
      *M->getFunction("fun2")->getEntryBlock().getFirstNonPHIOrDbg();
  DIAssignID *Fun2ID = cast_or_null<DIAssignID>(
      Fun2Alloca.getMetadata(LLVMContext::MD_DIAssignID));
  EXPECT_NE(New, Fun2ID);
  auto Fun2Markers = at::getAssignmentMarkers(&Fun2Alloca);
  ASSERT_TRUE(std::distance(Fun2Markers.begin(), Fun2Markers.end()) == 1);
  auto Fun2Insts = at::getAssignmentInsts(*Fun2Markers.begin());
  ASSERT_TRUE(std::distance(Fun2Insts.begin(), Fun2Insts.end()) == 1);
  EXPECT_EQ(*Fun2Insts.begin(), &Fun2Alloca);

  // 3. Check that deleting works and applies only to the target function.
  at::deleteAll(&Fun1);
  // There should now only be the alloca and ret in fun1.
  EXPECT_EQ(Fun1.begin()->size(), 2);
  // fun2's alloca should have the same DIAssignID and remain linked to its
  // llvm.dbg.assign.
  EXPECT_EQ(Fun2ID, cast_or_null<DIAssignID>(
                        Fun2Alloca.getMetadata(LLVMContext::MD_DIAssignID)));
  EXPECT_FALSE(at::getAssignmentMarkers(&Fun2Alloca).empty());
}

} // end namespace