/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp

Bug Summary

File:	llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
Warning:	line 914, column 38 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name DwarfUnit.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-08-06-171148-17323-1 -x c++ /build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
1//===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains support for constructing a dwarf compile unit.
10//
11//===----------------------------------------------------------------------===//

13#include "DwarfUnit.h"
14#include "AddressPool.h"
15#include "DwarfCompileUnit.h"
16#include "DwarfDebug.h"
17#include "DwarfExpression.h"
18#include "llvm/ADT/APFloat.h"
19#include "llvm/ADT/APInt.h"
20#include "llvm/ADT/None.h"
21#include "llvm/ADT/StringExtras.h"
22#include "llvm/ADT/iterator_range.h"
23#include "llvm/CodeGen/MachineFunction.h"
24#include "llvm/CodeGen/MachineOperand.h"
25#include "llvm/CodeGen/TargetRegisterInfo.h"
26#include "llvm/CodeGen/TargetSubtargetInfo.h"
27#include "llvm/IR/Constants.h"
28#include "llvm/IR/DataLayout.h"
29#include "llvm/IR/GlobalValue.h"
30#include "llvm/IR/Metadata.h"
31#include "llvm/MC/MCAsmInfo.h"
32#include "llvm/MC/MCContext.h"
33#include "llvm/MC/MCDwarf.h"
34#include "llvm/MC/MCSection.h"
35#include "llvm/MC/MCStreamer.h"
36#include "llvm/MC/MachineLocation.h"
37#include "llvm/Support/Casting.h"
38#include "llvm/Support/CommandLine.h"
39#include "llvm/Target/TargetLoweringObjectFile.h"
40#include <cassert>
41#include <cstdint>
42#include <string>
43#include <utility>

45using namespace llvm;

47#define DEBUG_TYPE"dwarfdebug" "dwarfdebug"

49DIEDwarfExpression::DIEDwarfExpression(const AsmPrinter &AP,
                                     DwarfCompileUnit &CU, DIELoc &DIE)
  : DwarfExpression(AP.getDwarfVersion(), CU), AP(AP), OutDIE(DIE) {}

53void DIEDwarfExpression::emitOp(uint8_t Op, const char* Comment) {
CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Op);
55}

57void DIEDwarfExpression::emitSigned(int64_t Value) {
CU.addSInt(getActiveDIE(), dwarf::DW_FORM_sdata, Value);
59}

61void DIEDwarfExpression::emitUnsigned(uint64_t Value) {
CU.addUInt(getActiveDIE(), dwarf::DW_FORM_udata, Value);
63}

65void DIEDwarfExpression::emitData1(uint8_t Value) {
CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Value);
67}

69void DIEDwarfExpression::emitBaseTypeRef(uint64_t Idx) {
CU.addBaseTypeRef(getActiveDIE(), Idx);
71}

73void DIEDwarfExpression::enableTemporaryBuffer() {
assert(!IsBuffering && "Already buffering?")((!IsBuffering && "Already buffering?") ? static_cast
<void> (0) : __assert_fail ("!IsBuffering && \"Already buffering?\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 74, __PRETTY_FUNCTION__));
IsBuffering = true;
76}

78void DIEDwarfExpression::disableTemporaryBuffer() { IsBuffering = false; }

80unsigned DIEDwarfExpression::getTemporaryBufferSize() {
return TmpDIE.ComputeSize(&AP);
82}

84void DIEDwarfExpression::commitTemporaryBuffer() { OutDIE.takeValues(TmpDIE); }

86bool DIEDwarfExpression::isFrameRegister(const TargetRegisterInfo &TRI,
                                       unsigned MachineReg) {
return MachineReg == TRI.getFrameRegister(*AP.MF);
89}

91DwarfUnit::DwarfUnit(dwarf::Tag UnitTag, const DICompileUnit *Node,
                   AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
  : DIEUnit(A->getDwarfVersion(), A->MAI->getCodePointerSize(), UnitTag),
    CUNode(Node), Asm(A), DD(DW), DU(DWU), IndexTyDie(nullptr) {
95}

97DwarfTypeUnit::DwarfTypeUnit(DwarfCompileUnit &CU, AsmPrinter *A,
                           DwarfDebug *DW, DwarfFile *DWU,
                           MCDwarfDwoLineTable *SplitLineTable)
  : DwarfUnit(dwarf::DW_TAG_type_unit, CU.getCUNode(), A, DW, DWU), CU(CU),
    SplitLineTable(SplitLineTable) {
102}

104DwarfUnit::~DwarfUnit() {
for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
  DIEBlocks[j]->~DIEBlock();
for (unsigned j = 0, M = DIELocs.size(); j < M; ++j)
  DIELocs[j]->~DIELoc();
109}

111int64_t DwarfUnit::getDefaultLowerBound() const {
switch (getLanguage()) {
default:
  break;

// The languages below have valid values in all DWARF versions.
case dwarf::DW_LANG_C:
case dwarf::DW_LANG_C89:
case dwarf::DW_LANG_C_plus_plus:
  return 0;

case dwarf::DW_LANG_Fortran77:
case dwarf::DW_LANG_Fortran90:
  return 1;

// The languages below have valid values only if the DWARF version >= 3.
case dwarf::DW_LANG_C99:
case dwarf::DW_LANG_ObjC:
case dwarf::DW_LANG_ObjC_plus_plus:
  if (DD->getDwarfVersion() >= 3)
    return 0;
  break;

case dwarf::DW_LANG_Fortran95:
  if (DD->getDwarfVersion() >= 3)
    return 1;
  break;

// Starting with DWARF v4, all defined languages have valid values.
case dwarf::DW_LANG_D:
case dwarf::DW_LANG_Java:
case dwarf::DW_LANG_Python:
case dwarf::DW_LANG_UPC:
  if (DD->getDwarfVersion() >= 4)
    return 0;
  break;

case dwarf::DW_LANG_Ada83:
case dwarf::DW_LANG_Ada95:
case dwarf::DW_LANG_Cobol74:
case dwarf::DW_LANG_Cobol85:
case dwarf::DW_LANG_Modula2:
case dwarf::DW_LANG_Pascal83:
case dwarf::DW_LANG_PLI:
  if (DD->getDwarfVersion() >= 4)
    return 1;
  break;

// The languages below are new in DWARF v5.
case dwarf::DW_LANG_BLISS:
case dwarf::DW_LANG_C11:
case dwarf::DW_LANG_C_plus_plus_03:
case dwarf::DW_LANG_C_plus_plus_11:
case dwarf::DW_LANG_C_plus_plus_14:
case dwarf::DW_LANG_Dylan:
case dwarf::DW_LANG_Go:
case dwarf::DW_LANG_Haskell:
case dwarf::DW_LANG_OCaml:
case dwarf::DW_LANG_OpenCL:
case dwarf::DW_LANG_RenderScript:
case dwarf::DW_LANG_Rust:
case dwarf::DW_LANG_Swift:
  if (DD->getDwarfVersion() >= 5)
    return 0;
  break;

case dwarf::DW_LANG_Fortran03:
case dwarf::DW_LANG_Fortran08:
case dwarf::DW_LANG_Julia:
case dwarf::DW_LANG_Modula3:
  if (DD->getDwarfVersion() >= 5)
    return 1;
  break;
}

return -1;
187}

189/// Check whether the DIE for this MDNode can be shared across CUs.
190bool DwarfUnit::isShareableAcrossCUs(const DINode *D) const {
// When the MDNode can be part of the type system (this includes subprogram
// declarations *and* subprogram definitions, even local definitions), the
// DIE must be shared across CUs.
// Combining type units and cross-CU DIE sharing is lower value (since
// cross-CU DIE sharing is used in LTO and removes type redundancy at that
// level already) but may be implementable for some value in projects
// building multiple independent libraries with LTO and then linking those
// together.
if (isDwoUnit() && !DD->shareAcrossDWOCUs())
  return false;
return (isa<DIType>(D) || isa<DISubprogram>(D)) && !DD->generateTypeUnits();
202}

204DIE *DwarfUnit::getDIE(const DINode *D) const {
if (isShareableAcrossCUs(D))
  return DU->getDIE(D);
return MDNodeToDieMap.lookup(D);
208}

210void DwarfUnit::insertDIE(const DINode *Desc, DIE *D) {
if (isShareableAcrossCUs(Desc)) {
  DU->insertDIE(Desc, D);
  return;
}
MDNodeToDieMap.insert(std::make_pair(Desc, D));
216}

218void DwarfUnit::insertDIE(DIE *D) {
MDNodeToDieMap.insert(std::make_pair(nullptr, D));
220}

222void DwarfUnit::addFlag(DIE &Die, dwarf::Attribute Attribute) {
if (DD->getDwarfVersion() >= 4)
  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag_present,
               DIEInteger(1));
else
  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag,
               DIEInteger(1));
229}

231void DwarfUnit::addUInt(DIEValueList &Die, dwarf::Attribute Attribute,
                      Optional<dwarf::Form> Form, uint64_t Integer) {
if (!Form)
  Form = DIEInteger::BestForm(false, Integer);
assert(Form != dwarf::DW_FORM_implicit_const &&((Form != dwarf::DW_FORM_implicit_const && "DW_FORM_implicit_const is used only for signed integers"
) ? static_cast<void> (0) : __assert_fail ("Form != dwarf::DW_FORM_implicit_const && \"DW_FORM_implicit_const is used only for signed integers\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 236, __PRETTY_FUNCTION__))
       "DW_FORM_implicit_const is used only for signed integers")((Form != dwarf::DW_FORM_implicit_const && "DW_FORM_implicit_const is used only for signed integers"
) ? static_cast<void> (0) : __assert_fail ("Form != dwarf::DW_FORM_implicit_const && \"DW_FORM_implicit_const is used only for signed integers\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 236, __PRETTY_FUNCTION__));
Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
238}

240void DwarfUnit::addUInt(DIEValueList &Block, dwarf::Form Form,
                      uint64_t Integer) {
addUInt(Block, (dwarf::Attribute)0, Form, Integer);
243}

245void DwarfUnit::addSInt(DIEValueList &Die, dwarf::Attribute Attribute,
                      Optional<dwarf::Form> Form, int64_t Integer) {
if (!Form)
  Form = DIEInteger::BestForm(true, Integer);
Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
250}

252void DwarfUnit::addSInt(DIELoc &Die, Optional<dwarf::Form> Form,
                      int64_t Integer) {
addSInt(Die, (dwarf::Attribute)0, Form, Integer);
255}

257void DwarfUnit::addString(DIE &Die, dwarf::Attribute Attribute,
                        StringRef String) {
if (CUNode->isDebugDirectivesOnly())
  return;

if (DD->useInlineStrings()) {
  Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_string,
               new (DIEValueAllocator)
                   DIEInlineString(String, DIEValueAllocator));
  return;
}
dwarf::Form IxForm =
    isDwoUnit() ? dwarf::DW_FORM_GNU_str_index : dwarf::DW_FORM_strp;

auto StringPoolEntry =
    useSegmentedStringOffsetsTable() || IxForm == dwarf::DW_FORM_GNU_str_index
        ? DU->getStringPool().getIndexedEntry(*Asm, String)
        : DU->getStringPool().getEntry(*Asm, String);

// For DWARF v5 and beyond, use the smallest strx? form possible.
if (useSegmentedStringOffsetsTable()) {
  IxForm = dwarf::DW_FORM_strx1;
  unsigned Index = StringPoolEntry.getIndex();
  if (Index > 0xffffff)
    IxForm = dwarf::DW_FORM_strx4;
  else if (Index > 0xffff)
    IxForm = dwarf::DW_FORM_strx3;
  else if (Index > 0xff)
    IxForm = dwarf::DW_FORM_strx2;
}
Die.addValue(DIEValueAllocator, Attribute, IxForm,
             DIEString(StringPoolEntry));
289}

291DIEValueList::value_iterator DwarfUnit::addLabel(DIEValueList &Die,
                                               dwarf::Attribute Attribute,
                                               dwarf::Form Form,
                                               const MCSymbol *Label) {
return Die.addValue(DIEValueAllocator, Attribute, Form, DIELabel(Label));
296}

298void DwarfUnit::addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label) {
addLabel(Die, (dwarf::Attribute)0, Form, Label);
300}

302void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute,
                               uint64_t Integer) {
if (DD->getDwarfVersion() >= 4)
  addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
else
  addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
308}

310unsigned DwarfTypeUnit::getOrCreateSourceID(const DIFile *File) {
if (!SplitLineTable)
  return getCU().getOrCreateSourceID(File);
if (!UsedLineTable) {
  UsedLineTable = true;
  // This is a split type unit that needs a line table.
  addSectionOffset(getUnitDie(), dwarf::DW_AT_stmt_list, 0);
}
return SplitLineTable->getFile(
    File->getDirectory(), File->getFilename(), DD->getMD5AsBytes(File),
    Asm->OutContext.getDwarfVersion(), File->getSource());
321}

323void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) {
if (DD->getDwarfVersion() >= 5) {
  addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addrx);
  addUInt(Die, dwarf::DW_FORM_addrx, DD->getAddressPool().getIndex(Sym));
  return;
}

if (DD->useSplitDwarf()) {
  addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
  addUInt(Die, dwarf::DW_FORM_GNU_addr_index,
          DD->getAddressPool().getIndex(Sym));
  return;
}

addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
addLabel(Die, dwarf::DW_FORM_addr, Sym);
339}

341void DwarfUnit::addLabelDelta(DIE &Die, dwarf::Attribute Attribute,
                            const MCSymbol *Hi, const MCSymbol *Lo) {
Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_data4,
             new (DIEValueAllocator) DIEDelta(Hi, Lo));
345}

347void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry) {
addDIEEntry(Die, Attribute, DIEEntry(Entry));
349}

351void DwarfUnit::addDIETypeSignature(DIE &Die, uint64_t Signature) {
// Flag the type unit reference as a declaration so that if it contains
// members (implicit special members, static data member definitions, member
// declarations for definitions in this CU, etc) consumers don't get confused
// and think this is a full definition.
addFlag(Die, dwarf::DW_AT_declaration);

Die.addValue(DIEValueAllocator, dwarf::DW_AT_signature,
             dwarf::DW_FORM_ref_sig8, DIEInteger(Signature));
360}

362void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute,
                          DIEEntry Entry) {
const DIEUnit *CU = Die.getUnit();
const DIEUnit *EntryCU = Entry.getEntry().getUnit();
if (!CU)
  // We assume that Die belongs to this CU, if it is not linked to any CU yet.
  CU = getUnitDie().getUnit();
if (!EntryCU)
  EntryCU = getUnitDie().getUnit();
Die.addValue(DIEValueAllocator, Attribute,
             EntryCU == CU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
             Entry);
374}

376DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N) {
DIE &Die = Parent.addChild(DIE::get(DIEValueAllocator, (dwarf::Tag)Tag));
if (N)
  insertDIE(N, &Die);
return Die;
381}

383void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc) {
Loc->ComputeSize(Asm);
DIELocs.push_back(Loc); // Memoize so we can call the destructor later on.
Die.addValue(DIEValueAllocator, Attribute,
             Loc->BestForm(DD->getDwarfVersion()), Loc);
388}

390void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute,
                       DIEBlock *Block) {
Block->ComputeSize(Asm);
DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
Die.addValue(DIEValueAllocator, Attribute, Block->BestForm(), Block);
395}

397void DwarfUnit::addSourceLine(DIE &Die, unsigned Line, const DIFile *File) {
if (Line == 0)
  return;

unsigned FileID = getOrCreateSourceID(File);
addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
404}

406void DwarfUnit::addSourceLine(DIE &Die, const DILocalVariable *V) {
assert(V)((V) ? static_cast<void> (0) : __assert_fail ("V", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 407, __PRETTY_FUNCTION__));

addSourceLine(Die, V->getLine(), V->getFile());
410}

412void DwarfUnit::addSourceLine(DIE &Die, const DIGlobalVariable *G) {
assert(G)((G) ? static_cast<void> (0) : __assert_fail ("G", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 413, __PRETTY_FUNCTION__));

addSourceLine(Die, G->getLine(), G->getFile());
416}

418void DwarfUnit::addSourceLine(DIE &Die, const DISubprogram *SP) {
assert(SP)((SP) ? static_cast<void> (0) : __assert_fail ("SP", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 419, __PRETTY_FUNCTION__));

addSourceLine(Die, SP->getLine(), SP->getFile());
422}

424void DwarfUnit::addSourceLine(DIE &Die, const DILabel *L) {
assert(L)((L) ? static_cast<void> (0) : __assert_fail ("L", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 425, __PRETTY_FUNCTION__));

addSourceLine(Die, L->getLine(), L->getFile());
428}

430void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
assert(Ty)((Ty) ? static_cast<void> (0) : __assert_fail ("Ty", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 431, __PRETTY_FUNCTION__));

addSourceLine(Die, Ty->getLine(), Ty->getFile());
434}

436void DwarfUnit::addSourceLine(DIE &Die, const DIObjCProperty *Ty) {
assert(Ty)((Ty) ? static_cast<void> (0) : __assert_fail ("Ty", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 437, __PRETTY_FUNCTION__));

addSourceLine(Die, Ty->getLine(), Ty->getFile());
440}

442/// Return true if type encoding is unsigned.
443static bool isUnsignedDIType(DwarfDebug *DD, const DIType *Ty) {
if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
  // FIXME: Enums without a fixed underlying type have unknown signedness
  // here, leading to incorrectly emitted constants.
  if (CTy->getTag() == dwarf::DW_TAG_enumeration_type)
    return false;

  // (Pieces of) aggregate types that get hacked apart by SROA may be
  // represented by a constant. Encode them as unsigned bytes.
  return true;
}

if (auto *DTy = dyn_cast<DIDerivedType>(Ty)) {
  dwarf::Tag T = (dwarf::Tag)Ty->getTag();
  // Encode pointer constants as unsigned bytes. This is used at least for
  // null pointer constant emission.
  // FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
  // here, but accept them for now due to a bug in SROA producing bogus
  // dbg.values.
  if (T == dwarf::DW_TAG_pointer_type ||
      T == dwarf::DW_TAG_ptr_to_member_type ||
      T == dwarf::DW_TAG_reference_type ||
      T == dwarf::DW_TAG_rvalue_reference_type)
    return true;
  assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||((T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type
 || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type
 || T == dwarf::DW_TAG_atomic_type) ? static_cast<void>
 (0) : __assert_fail ("T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type"
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 469, __PRETTY_FUNCTION__))
         T == dwarf::DW_TAG_volatile_type ||((T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type
 || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type
 || T == dwarf::DW_TAG_atomic_type) ? static_cast<void>
 (0) : __assert_fail ("T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type"
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 469, __PRETTY_FUNCTION__))
         T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type)((T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type
 || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type
 || T == dwarf::DW_TAG_atomic_type) ? static_cast<void>
 (0) : __assert_fail ("T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type || T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type"
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 469, __PRETTY_FUNCTION__));
  assert(DTy->getBaseType() && "Expected valid base type")((DTy->getBaseType() && "Expected valid base type"
) ? static_cast<void> (0) : __assert_fail ("DTy->getBaseType() && \"Expected valid base type\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 470, __PRETTY_FUNCTION__));
  return isUnsignedDIType(DD, DTy->getBaseType());
}

auto *BTy = cast<DIBasicType>(Ty);
unsigned Encoding = BTy->getEncoding();
assert((Encoding == dwarf::DW_ATE_unsigned ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        Encoding == dwarf::DW_ATE_unsigned_char ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        Encoding == dwarf::DW_ATE_signed ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        Encoding == dwarf::DW_ATE_signed_char ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        Encoding == dwarf::DW_ATE_boolean ||(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
        (Ty->getTag() == dwarf::DW_TAG_unspecified_type &&(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
         Ty->getName() == "decltype(nullptr)")) &&(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__))
       "Unsupported encoding")(((Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char
 || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char
 || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF
 || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf
::DW_TAG_unspecified_type && Ty->getName() == "decltype(nullptr)"
)) && "Unsupported encoding") ? static_cast<void>
 (0) : __assert_fail ("(Encoding == dwarf::DW_ATE_unsigned || Encoding == dwarf::DW_ATE_unsigned_char || Encoding == dwarf::DW_ATE_signed || Encoding == dwarf::DW_ATE_signed_char || Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean || (Ty->getTag() == dwarf::DW_TAG_unspecified_type && Ty->getName() == \"decltype(nullptr)\")) && \"Unsupported encoding\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 484, __PRETTY_FUNCTION__));
return Encoding == dwarf::DW_ATE_unsigned ||
       Encoding == dwarf::DW_ATE_unsigned_char ||
       Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean ||
       Ty->getTag() == dwarf::DW_TAG_unspecified_type;
489}

491void DwarfUnit::addConstantFPValue(DIE &Die, const MachineOperand &MO) {
assert(MO.isFPImm() && "Invalid machine operand!")((MO.isFPImm() && "Invalid machine operand!") ? static_cast
<void> (0) : __assert_fail ("MO.isFPImm() && \"Invalid machine operand!\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 492, __PRETTY_FUNCTION__));
DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
APFloat FPImm = MO.getFPImm()->getValueAPF();

// Get the raw data form of the floating point.
const APInt FltVal = FPImm.bitcastToAPInt();
const char *FltPtr = (const char *)FltVal.getRawData();

int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
bool LittleEndian = Asm->getDataLayout().isLittleEndian();
int Incr = (LittleEndian ? 1 : -1);
int Start = (LittleEndian ? 0 : NumBytes - 1);
int Stop = (LittleEndian ? NumBytes : -1);

// Output the constant to DWARF one byte at a time.
for (; Start != Stop; Start += Incr)
  addUInt(*Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);

addBlock(Die, dwarf::DW_AT_const_value, Block);
511}

513void DwarfUnit::addConstantFPValue(DIE &Die, const ConstantFP *CFP) {
// Pass this down to addConstantValue as an unsigned bag of bits.
addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
516}

518void DwarfUnit::addConstantValue(DIE &Die, const ConstantInt *CI,
                               const DIType *Ty) {
addConstantValue(Die, CI->getValue(), Ty);
521}

523void DwarfUnit::addConstantValue(DIE &Die, const MachineOperand &MO,
                               const DIType *Ty) {
assert(MO.isImm() && "Invalid machine operand!")((MO.isImm() && "Invalid machine operand!") ? static_cast
<void> (0) : __assert_fail ("MO.isImm() && \"Invalid machine operand!\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 525, __PRETTY_FUNCTION__));

addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
528}

530void DwarfUnit::addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty) {
addConstantValue(Die, isUnsignedDIType(DD, Ty), Val);
532}

534void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
// FIXME: This is a bit conservative/simple - it emits negative values always
// sign extended to 64 bits rather than minimizing the number of bytes.
addUInt(Die, dwarf::DW_AT_const_value,
        Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
539}

541void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty) {
addConstantValue(Die, Val, isUnsignedDIType(DD, Ty));
543}

545void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, bool Unsigned) {
unsigned CIBitWidth = Val.getBitWidth();
if (CIBitWidth <= 64) {
  addConstantValue(Die, Unsigned,
                   Unsigned ? Val.getZExtValue() : Val.getSExtValue());
  return;
}

DIEBlock *Block = new (DIEValueAllocator) DIEBlock;

// Get the raw data form of the large APInt.
const uint64_t *Ptr64 = Val.getRawData();

int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
bool LittleEndian = Asm->getDataLayout().isLittleEndian();

// Output the constant to DWARF one byte at a time.
for (int i = 0; i < NumBytes; i++) {
  uint8_t c;
  if (LittleEndian)
    c = Ptr64[i / 8] >> (8 * (i & 7));
  else
    c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
  addUInt(*Block, dwarf::DW_FORM_data1, c);
}

addBlock(Die, dwarf::DW_AT_const_value, Block);
572}

574void DwarfUnit::addLinkageName(DIE &Die, StringRef LinkageName) {
if (!LinkageName.empty())
  addString(Die,
            DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
                                       : dwarf::DW_AT_MIPS_linkage_name,
            GlobalValue::dropLLVMManglingEscape(LinkageName));
580}

582void DwarfUnit::addTemplateParams(DIE &Buffer, DINodeArray TParams) {
// Add template parameters.
for (const auto *Element : TParams) {
  if (auto *TTP = dyn_cast<DITemplateTypeParameter>(Element))
    constructTemplateTypeParameterDIE(Buffer, TTP);
  else if (auto *TVP = dyn_cast<DITemplateValueParameter>(Element))
    constructTemplateValueParameterDIE(Buffer, TVP);
}
590}

592/// Add thrown types.
593void DwarfUnit::addThrownTypes(DIE &Die, DINodeArray ThrownTypes) {
for (const auto *Ty : ThrownTypes) {
  DIE &TT = createAndAddDIE(dwarf::DW_TAG_thrown_type, Die);
  addType(TT, cast<DIType>(Ty));
}
598}

600DIE *DwarfUnit::getOrCreateContextDIE(const DIScope *Context) {
if (!Context || isa<DIFile>(Context))
  return &getUnitDie();
if (auto *T = dyn_cast<DIType>(Context))
  return getOrCreateTypeDIE(T);
if (auto *NS = dyn_cast<DINamespace>(Context))
  return getOrCreateNameSpace(NS);
if (auto *SP = dyn_cast<DISubprogram>(Context))
  return getOrCreateSubprogramDIE(SP);
if (auto *M = dyn_cast<DIModule>(Context))
  return getOrCreateModule(M);
return getDIE(Context);
612}

614DIE *DwarfUnit::createTypeDIE(const DICompositeType *Ty) {
auto *Context = Ty->getScope();
DIE *ContextDIE = getOrCreateContextDIE(Context);

if (DIE *TyDIE = getDIE(Ty))
4
←
Assuming 'TyDIE' is null→
5
←
Taking false branch→
  return TyDIE;

// Create new type.
DIE &TyDIE = createAndAddDIE(Ty->getTag(), *ContextDIE, Ty);

constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
6
←
'Ty' is a 'DICompositeType'→
7
←
Calling 'DwarfUnit::constructTypeDIE'→

updateAcceleratorTables(Context, Ty, TyDIE);
return &TyDIE;
628}

630DIE *DwarfUnit::createTypeDIE(const DIScope *Context, DIE &ContextDIE,
                            const DIType *Ty) {
// Create new type.
DIE &TyDIE = createAndAddDIE(Ty->getTag(), ContextDIE, Ty);

updateAcceleratorTables(Context, Ty, TyDIE);

if (auto *BT = dyn_cast<DIBasicType>(Ty))
  constructTypeDIE(TyDIE, BT);
else if (auto *STy = dyn_cast<DISubroutineType>(Ty))
  constructTypeDIE(TyDIE, STy);
else if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
  if (DD->generateTypeUnits() && !Ty->isForwardDecl() &&
      (Ty->getRawName() || CTy->getRawIdentifier())) {
    // Skip updating the accelerator tables since this is not the full type.
    if (MDString *TypeId = CTy->getRawIdentifier())
      DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
    else {
      auto X = DD->enterNonTypeUnitContext();
      finishNonUnitTypeDIE(TyDIE, CTy);
    }
    return &TyDIE;
  }
  constructTypeDIE(TyDIE, CTy);
} else {
  constructTypeDIE(TyDIE, cast<DIDerivedType>(Ty));
}

return &TyDIE;
659}

661DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
if (!TyNode)
  return nullptr;

auto *Ty = cast<DIType>(TyNode);

// DW_TAG_restrict_type is not supported in DWARF2
if (Ty->getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
  return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());

// DW_TAG_atomic_type is not supported in DWARF < 5
if (Ty->getTag() == dwarf::DW_TAG_atomic_type && DD->getDwarfVersion() < 5)
  return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());

// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE.
auto *Context = Ty->getScope();
DIE *ContextDIE = getOrCreateContextDIE(Context);
assert(ContextDIE)((ContextDIE) ? static_cast<void> (0) : __assert_fail (
"ContextDIE", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 679, __PRETTY_FUNCTION__));

if (DIE *TyDIE = getDIE(Ty))
  return TyDIE;

return static_cast<DwarfUnit *>(ContextDIE->getUnit())
    ->createTypeDIE(Context, *ContextDIE, Ty);
686}

688void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
                                      const DIType *Ty, const DIE &TyDIE) {
if (!Ty->getName().empty() && !Ty->isForwardDecl()) {
  bool IsImplementation = false;
  if (auto *CT = dyn_cast<DICompositeType>(Ty)) {
    // A runtime language of 0 actually means C/C++ and that any
    // non-negative value is some version of Objective-C/C++.
    IsImplementation = CT->getRuntimeLang() == 0 || CT->isObjcClassComplete();
  }
  unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
  DD->addAccelType(*CUNode, Ty->getName(), TyDIE, Flags);

  if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
      isa<DINamespace>(Context) || isa<DICommonBlock>(Context))
    addGlobalType(Ty, TyDIE, Context);
}
704}

706void DwarfUnit::addType(DIE &Entity, const DIType *Ty,
                      dwarf::Attribute Attribute) {
assert(Ty && "Trying to add a type that doesn't exist?")((Ty && "Trying to add a type that doesn't exist?") ?
 static_cast<void> (0) : __assert_fail ("Ty && \"Trying to add a type that doesn't exist?\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 708, __PRETTY_FUNCTION__));
addDIEEntry(Entity, Attribute, DIEEntry(*getOrCreateTypeDIE(Ty)));
710}

712std::string DwarfUnit::getParentContextString(const DIScope *Context) const {
if (!Context)
  return "";

// FIXME: Decide whether to implement this for non-C++ languages.
if (!dwarf::isCPlusPlus((dwarf::SourceLanguage)getLanguage()))
  return "";

std::string CS;
SmallVector<const DIScope *, 1> Parents;
while (!isa<DICompileUnit>(Context)) {
  Parents.push_back(Context);
  if (const DIScope *S = Context->getScope())
    Context = S;
  else
    // Structure, etc types will have a NULL context if they're at the top
    // level.
    break;
}

// Reverse iterate over our list to go from the outermost construct to the
// innermost.
for (const DIScope *Ctx : make_range(Parents.rbegin(), Parents.rend())) {
  StringRef Name = Ctx->getName();
  if (Name.empty() && isa<DINamespace>(Ctx))
    Name = "(anonymous namespace)";
  if (!Name.empty()) {
    CS += Name;
    CS += "::";
  }
}
return CS;
744}

746void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIBasicType *BTy) {
// Get core information.
StringRef Name = BTy->getName();
// Add name if not anonymous or intermediate type.
if (!Name.empty())
  addString(Buffer, dwarf::DW_AT_name, Name);

// An unspecified type only has a name attribute.
if (BTy->getTag() == dwarf::DW_TAG_unspecified_type)
  return;

addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
        BTy->getEncoding());

uint64_t Size = BTy->getSizeInBits() >> 3;
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);

if (BTy->isBigEndian())
  addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_big);
else if (BTy->isLittleEndian())
  addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_little);
767}

769void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
// Get core information.
StringRef Name = DTy->getName();
uint64_t Size = DTy->getSizeInBits() >> 3;
uint16_t Tag = Buffer.getTag();

// Map to main type, void will not have a type.
const DIType *FromTy = DTy->getBaseType();
if (FromTy)
  addType(Buffer, FromTy);

// Add name if not anonymous or intermediate type.
if (!Name.empty())
  addString(Buffer, dwarf::DW_AT_name, Name);

// If alignment is specified for a typedef , create and insert DW_AT_alignment
// attribute in DW_TAG_typedef DIE.
if (Tag == dwarf::DW_TAG_typedef && DD->getDwarfVersion() >= 5) {
  uint32_t AlignInBytes = DTy->getAlignInBytes();
  if (AlignInBytes > 0)
    addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
            AlignInBytes);
}

// Add size if non-zero (derived types might be zero-sized.)
if (Size && Tag != dwarf::DW_TAG_pointer_type
         && Tag != dwarf::DW_TAG_ptr_to_member_type
         && Tag != dwarf::DW_TAG_reference_type
         && Tag != dwarf::DW_TAG_rvalue_reference_type)
  addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);

if (Tag == dwarf::DW_TAG_ptr_to_member_type)
  addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
              *getOrCreateTypeDIE(cast<DIDerivedType>(DTy)->getClassType()));
// Add source line info if available and TyDesc is not a forward declaration.
if (!DTy->isForwardDecl())
  addSourceLine(Buffer, DTy);

// If DWARF address space value is other than None, add it.  The IR
// verifier checks that DWARF address space only exists for pointer
// or reference types.
if (DTy->getDWARFAddressSpace())
  addUInt(Buffer, dwarf::DW_AT_address_class, dwarf::DW_FORM_data4,
          DTy->getDWARFAddressSpace().getValue());
813}

815void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args) {
for (unsigned i = 1, N = Args.size(); i < N; ++i) {
  const DIType *Ty = Args[i];
  if (!Ty) {
    assert(i == N-1 && "Unspecified parameter must be the last argument")((i == N-1 && "Unspecified parameter must be the last argument"
) ? static_cast<void> (0) : __assert_fail ("i == N-1 && \"Unspecified parameter must be the last argument\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 819, __PRETTY_FUNCTION__));
    createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
  } else {
    DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
    addType(Arg, Ty);
    if (Ty->isArtificial())
      addFlag(Arg, dwarf::DW_AT_artificial);
  }
}
828}

830void DwarfUnit::constructTypeDIE(DIE &Buffer, const DISubroutineType *CTy) {
// Add return type.  A void return won't have a type.
auto Elements = cast<DISubroutineType>(CTy)->getTypeArray();
if (Elements.size())
  if (auto RTy = Elements[0])
    addType(Buffer, RTy);

bool isPrototyped = true;
if (Elements.size() == 2 && !Elements[1])
  isPrototyped = false;

constructSubprogramArguments(Buffer, Elements);

// Add prototype flag if we're dealing with a C language and the function has
// been prototyped.
uint16_t Language = getLanguage();
if (isPrototyped &&
    (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
     Language == dwarf::DW_LANG_ObjC))
  addFlag(Buffer, dwarf::DW_AT_prototyped);

// Add a DW_AT_calling_convention if this has an explicit convention.
if (CTy->getCC() && CTy->getCC() != dwarf::DW_CC_normal)
  addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
          CTy->getCC());

if (CTy->isLValueReference())
  addFlag(Buffer, dwarf::DW_AT_reference);

if (CTy->isRValueReference())
  addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
861}

863void DwarfUnit::constructTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
// Add name if not anonymous or intermediate type.
StringRef Name = CTy->getName();

uint64_t Size = CTy->getSizeInBits() >> 3;
uint16_t Tag = Buffer.getTag();

switch (Tag) {
8
←
Control jumps to 'case DW_TAG_variant_part:'  at line 877→
24
←
Control jumps to 'case DW_TAG_variant_part:'  at line 877→
41
←
Control jumps to 'case DW_TAG_variant_part:'  at line 877→
case dwarf::DW_TAG_array_type:
  constructArrayTypeDIE(Buffer, CTy);
  break;
case dwarf::DW_TAG_enumeration_type:
  constructEnumTypeDIE(Buffer, CTy);
  break;
case dwarf::DW_TAG_variant_part:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_class_type: {
  // Emit the discriminator for a variant part.
  DIDerivedType *Discriminator = nullptr;
  if (Tag8.1
'Tag' is equal to DW_TAG_variant_part
1
'Tag' is equal to DW_TAG_variant_part
1
'Tag' is equal to DW_TAG_variant_part
 == dwarf::DW_TAG_variant_part) {
9
←
Taking true branch→
25
←
Taking true branch→
42
←
Taking true branch→
    Discriminator = CTy->getDiscriminator();
43
←
Value assigned to 'Discriminator'→
    if (Discriminator9.1
'Discriminator' is non-null
) {
10
←
Taking true branch→
26
←
Assuming 'Discriminator' is null→
27
←
Taking false branch→
44
←
Assuming 'Discriminator' is null→
45
←
Taking false branch→
      // DWARF says:
      //    If the variant part has a discriminant, the discriminant is
      //    represented by a separate debugging information entry which is
      //    a child of the variant part entry.
      DIE &DiscMember = constructMemberDIE(Buffer, Discriminator);
      addDIEEntry(Buffer, dwarf::DW_AT_discr, DiscMember);
    }
  }

  // Add elements to structure type.
  DINodeArray Elements = CTy->getElements();
  for (const auto *Element : Elements) {
    if (!Element)
11
←
Assuming 'Element' is non-null→
12
←
Taking false branch→
28
←
Assuming 'Element' is non-null→
29
←
Taking false branch→
46
←
Assuming 'Element' is non-null→
47
←
Taking false branch→
      continue;
    if (auto *SP13.1
'SP' is null
1
'SP' is null
1
'SP' is null
 = dyn_cast<DISubprogram>(Element))
13
←
Assuming 'Element' is not a 'DISubprogram'→
14
←
Taking false branch→
30
←
Assuming 'Element' is not a 'DISubprogram'→
31
←
Taking false branch→
48
←
Assuming 'Element' is not a 'DISubprogram'→
49
←
Taking false branch→
      getOrCreateSubprogramDIE(SP);
    else if (auto *DDTy15.1
'DDTy' is null
1
'DDTy' is null
1
'DDTy' is non-null
 = dyn_cast<DIDerivedType>(Element)) {
15
←
Assuming 'Element' is not a 'DIDerivedType'→
16
←
Taking false branch→
32
←
Assuming 'Element' is not a 'DIDerivedType'→
33
←
Taking false branch→
50
←
Assuming 'Element' is a 'DIDerivedType'→
51
←
Taking true branch→
      if (DDTy->getTag() == dwarf::DW_TAG_friend) {
52
←
Assuming the condition is false→
53
←
Taking false branch→
        DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
        addType(ElemDie, DDTy->getBaseType(), dwarf::DW_AT_friend);
      } else if (DDTy->isStaticMember()) {
54
←
Assuming the condition is false→
55
←
Taking false branch→
        getOrCreateStaticMemberDIE(DDTy);
      } else if (Tag55.1
'Tag' is equal to DW_TAG_variant_part
 == dwarf::DW_TAG_variant_part) {
56
←
Taking true branch→
        // When emitting a variant part, wrap each member in
        // DW_TAG_variant.
        DIE &Variant = createAndAddDIE(dwarf::DW_TAG_variant, Buffer);
        if (const ConstantInt *CI57.1
'CI' is non-null
 =
58
←
Taking true branch→
            dyn_cast_or_null<ConstantInt>(DDTy->getDiscriminantValue())) {
57
←
Assuming the object is a 'ConstantInt'→
          if (isUnsignedDIType(DD, Discriminator->getBaseType()))
59
←
Called C++ object pointer is null
            addUInt(Variant, dwarf::DW_AT_discr_value, None, CI->getZExtValue());
          else
            addSInt(Variant, dwarf::DW_AT_discr_value, None, CI->getSExtValue());
        }
        constructMemberDIE(Variant, DDTy);
      } else {
        constructMemberDIE(Buffer, DDTy);
      }
    } else if (auto *Property17.1
'Property' is null
1
'Property' is null
 = dyn_cast<DIObjCProperty>(Element)) {
17
←
Assuming 'Element' is not a 'DIObjCProperty'→
18
←
Taking false branch→
34
←
Assuming 'Element' is not a 'DIObjCProperty'→
35
←
Taking false branch→
      DIE &ElemDie = createAndAddDIE(Property->getTag(), Buffer);
      StringRef PropertyName = Property->getName();
      addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
      if (Property->getType())
        addType(ElemDie, Property->getType());
      addSourceLine(ElemDie, Property);
      StringRef GetterName = Property->getGetterName();
      if (!GetterName.empty())
        addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
      StringRef SetterName = Property->getSetterName();
      if (!SetterName.empty())
        addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
      if (unsigned PropertyAttributes = Property->getAttributes())
        addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
                PropertyAttributes);
    } else if (auto *Composite19.1
'Composite' is non-null
1
'Composite' is non-null
 = dyn_cast<DICompositeType>(Element)) {
19
←
Assuming 'Element' is a 'DICompositeType'→
20
←
Taking true branch→
36
←
Assuming 'Element' is a 'DICompositeType'→
37
←
Taking true branch→
      if (Composite->getTag() == dwarf::DW_TAG_variant_part) {
21
←
Assuming the condition is true→
22
←
Taking true branch→
38
←
Assuming the condition is true→
39
←
Taking true branch→
        DIE &VariantPart = createAndAddDIE(Composite->getTag(), Buffer);
        constructTypeDIE(VariantPart, Composite);
23
←
Calling 'DwarfUnit::constructTypeDIE'→
40
←
Calling 'DwarfUnit::constructTypeDIE'→
      }
    }
  }

  if (CTy->isAppleBlockExtension())
    addFlag(Buffer, dwarf::DW_AT_APPLE_block);

  if (CTy->getExportSymbols())
    addFlag(Buffer, dwarf::DW_AT_export_symbols);

  // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
  // inside C++ composite types to point to the base class with the vtable.
  // Rust uses DW_AT_containing_type to link a vtable to the type
  // for which it was created.
  if (auto *ContainingType = CTy->getVTableHolder())
    addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
                *getOrCreateTypeDIE(ContainingType));

  if (CTy->isObjcClassComplete())
    addFlag(Buffer, dwarf::DW_AT_APPLE_objc_complete_type);

  // Add template parameters to a class, structure or union types.
  // FIXME: The support isn't in the metadata for this yet.
  if (Tag == dwarf::DW_TAG_class_type ||
      Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
    addTemplateParams(Buffer, CTy->getTemplateParams());

  // Add the type's non-standard calling convention.
  uint8_t CC = 0;
  if (CTy->isTypePassByValue())
    CC = dwarf::DW_CC_pass_by_value;
  else if (CTy->isTypePassByReference())
    CC = dwarf::DW_CC_pass_by_reference;
  if (CC)
    addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
            CC);
  break;
}
default:
  break;
}

// Add name if not anonymous or intermediate type.
if (!Name.empty())
  addString(Buffer, dwarf::DW_AT_name, Name);

if (Tag == dwarf::DW_TAG_enumeration_type ||
    Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
    Tag == dwarf::DW_TAG_union_type) {
  // Add size if non-zero (derived types might be zero-sized.)
  // TODO: Do we care about size for enum forward declarations?
  if (Size)
    addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
  else if (!CTy->isForwardDecl())
    // Add zero size if it is not a forward declaration.
    addUInt(Buffer, dwarf::DW_AT_byte_size, None, 0);

  // If we're a forward decl, say so.
  if (CTy->isForwardDecl())
    addFlag(Buffer, dwarf::DW_AT_declaration);

  // Add source line info if available.
  if (!CTy->isForwardDecl())
    addSourceLine(Buffer, CTy);

  // No harm in adding the runtime language to the declaration.
  unsigned RLang = CTy->getRuntimeLang();
  if (RLang)
    addUInt(Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
            RLang);

  // Add align info if available.
  if (uint32_t AlignInBytes = CTy->getAlignInBytes())
    addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
            AlignInBytes);
}
1019}

1021void DwarfUnit::constructTemplateTypeParameterDIE(
  DIE &Buffer, const DITemplateTypeParameter *TP) {
DIE &ParamDIE =
    createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
// Add the type if it exists, it could be void and therefore no type.
if (TP->getType())
  addType(ParamDIE, TP->getType());
if (!TP->getName().empty())
  addString(ParamDIE, dwarf::DW_AT_name, TP->getName());
if (TP->isDefault() && (DD->getDwarfVersion() >= 5))
  addFlag(ParamDIE, dwarf::DW_AT_default_value);
1032}

1034void DwarfUnit::constructTemplateValueParameterDIE(
  DIE &Buffer, const DITemplateValueParameter *VP) {
DIE &ParamDIE = createAndAddDIE(VP->getTag(), Buffer);

// Add the type if there is one, template template and template parameter
// packs will not have a type.
if (VP->getTag() == dwarf::DW_TAG_template_value_parameter)
  addType(ParamDIE, VP->getType());
if (!VP->getName().empty())
  addString(ParamDIE, dwarf::DW_AT_name, VP->getName());
if (VP->isDefault() && (DD->getDwarfVersion() >= 5))
  addFlag(ParamDIE, dwarf::DW_AT_default_value);
if (Metadata *Val = VP->getValue()) {
  if (ConstantInt *CI = mdconst::dyn_extract<ConstantInt>(Val))
    addConstantValue(ParamDIE, CI, VP->getType());
  else if (GlobalValue *GV = mdconst::dyn_extract<GlobalValue>(Val)) {
    // We cannot describe the location of dllimport'd entities: the
    // computation of their address requires loads from the IAT.
    if (!GV->hasDLLImportStorageClass()) {
      // For declaration non-type template parameters (such as global values
      // and functions)
      DIELoc *Loc = new (DIEValueAllocator) DIELoc;
      addOpAddress(*Loc, Asm->getSymbol(GV));
      // Emit DW_OP_stack_value to use the address as the immediate value of
      // the parameter, rather than a pointer to it.
      addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
      addBlock(ParamDIE, dwarf::DW_AT_location, Loc);
    }
  } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_template_param) {
    assert(isa<MDString>(Val))((isa<MDString>(Val)) ? static_cast<void> (0) : __assert_fail
 ("isa<MDString>(Val)", "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1063, __PRETTY_FUNCTION__));
    addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
              cast<MDString>(Val)->getString());
  } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
    addTemplateParams(ParamDIE, cast<MDTuple>(Val));
  }
}
1070}

1072DIE *DwarfUnit::getOrCreateNameSpace(const DINamespace *NS) {
// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(NS->getScope());

if (DIE *NDie = getDIE(NS))
  return NDie;
DIE &NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);

StringRef Name = NS->getName();
if (!Name.empty())
  addString(NDie, dwarf::DW_AT_name, NS->getName());
else
  Name = "(anonymous namespace)";
DD->addAccelNamespace(*CUNode, Name, NDie);
addGlobalName(Name, NDie, NS->getScope());
if (NS->getExportSymbols())
  addFlag(NDie, dwarf::DW_AT_export_symbols);
return &NDie;
1091}

1093DIE *DwarfUnit::getOrCreateModule(const DIModule *M) {
// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(M->getScope());

if (DIE *MDie = getDIE(M))
  return MDie;
DIE &MDie = createAndAddDIE(dwarf::DW_TAG_module, *ContextDIE, M);

if (!M->getName().empty()) {
  addString(MDie, dwarf::DW_AT_name, M->getName());
  addGlobalName(M->getName(), MDie, M->getScope());
}
if (!M->getConfigurationMacros().empty())
  addString(MDie, dwarf::DW_AT_LLVM_config_macros,
            M->getConfigurationMacros());
if (!M->getIncludePath().empty())
  addString(MDie, dwarf::DW_AT_LLVM_include_path, M->getIncludePath());
if (!M->getAPINotesFile().empty())
  addString(MDie, dwarf::DW_AT_LLVM_apinotes, M->getAPINotesFile());
if (M->getFile())
  addUInt(MDie, dwarf::DW_AT_decl_file, None,
          getOrCreateSourceID(M->getFile()));
if (M->getLineNo())
  addUInt(MDie, dwarf::DW_AT_decl_line, None, M->getLineNo());

return &MDie;
1120}

1122DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal) {
// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE (as is the case for member function
// declarations).
DIE *ContextDIE =
    Minimal ? &getUnitDie() : getOrCreateContextDIE(SP->getScope());

if (DIE *SPDie = getDIE(SP))
  return SPDie;

if (auto *SPDecl = SP->getDeclaration()) {
  if (!Minimal) {
    // Add subprogram definitions to the CU die directly.
    ContextDIE = &getUnitDie();
    // Build the decl now to ensure it precedes the definition.
    getOrCreateSubprogramDIE(SPDecl);
  }
}

// DW_TAG_inlined_subroutine may refer to this DIE.
DIE &SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);

// Stop here and fill this in later, depending on whether or not this
// subprogram turns out to have inlined instances or not.
if (SP->isDefinition())
  return &SPDie;

static_cast<DwarfUnit *>(SPDie.getUnit())
    ->applySubprogramAttributes(SP, SPDie);
return &SPDie;
1152}

1154bool DwarfUnit::applySubprogramDefinitionAttributes(const DISubprogram *SP,
                                                  DIE &SPDie) {
DIE *DeclDie = nullptr;
StringRef DeclLinkageName;
if (auto *SPDecl = SP->getDeclaration()) {
  DITypeRefArray DeclArgs, DefinitionArgs;
  DeclArgs = SPDecl->getType()->getTypeArray();
  DefinitionArgs = SP->getType()->getTypeArray();

  if (DeclArgs.size() && DefinitionArgs.size())
    if (DefinitionArgs[0] != NULL__null && DeclArgs[0] != DefinitionArgs[0])
      addType(SPDie, DefinitionArgs[0]);

  DeclDie = getDIE(SPDecl);
  assert(DeclDie && "This DIE should've already been constructed when the "((DeclDie && "This DIE should've already been constructed when the "
 "definition DIE was created in " "getOrCreateSubprogramDIE")
 ? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1170, __PRETTY_FUNCTION__))
                    "definition DIE was created in "((DeclDie && "This DIE should've already been constructed when the "
 "definition DIE was created in " "getOrCreateSubprogramDIE")
 ? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1170, __PRETTY_FUNCTION__))
                    "getOrCreateSubprogramDIE")((DeclDie && "This DIE should've already been constructed when the "
 "definition DIE was created in " "getOrCreateSubprogramDIE")
 ? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1170, __PRETTY_FUNCTION__));
  // Look at the Decl's linkage name only if we emitted it.
  if (DD->useAllLinkageNames())
    DeclLinkageName = SPDecl->getLinkageName();
  unsigned DeclID = getOrCreateSourceID(SPDecl->getFile());
  unsigned DefID = getOrCreateSourceID(SP->getFile());
  if (DeclID != DefID)
    addUInt(SPDie, dwarf::DW_AT_decl_file, None, DefID);

  if (SP->getLine() != SPDecl->getLine())
    addUInt(SPDie, dwarf::DW_AT_decl_line, None, SP->getLine());
}

// Add function template parameters.
addTemplateParams(SPDie, SP->getTemplateParams());

// Add the linkage name if we have one and it isn't in the Decl.
StringRef LinkageName = SP->getLinkageName();
assert(((LinkageName.empty() || DeclLinkageName.empty()) ||((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
 == DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1190, __PRETTY_FUNCTION__))
        LinkageName == DeclLinkageName) &&((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
 == DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1190, __PRETTY_FUNCTION__))
       "decl has a linkage name and it is different")((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
 == DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1190, __PRETTY_FUNCTION__));
if (DeclLinkageName.empty() &&
    // Always emit it for abstract subprograms.
    (DD->useAllLinkageNames() || DU->getAbstractSPDies().lookup(SP)))
  addLinkageName(SPDie, LinkageName);

if (!DeclDie)
  return false;

// Refer to the function declaration where all the other attributes will be
// found.
addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie);
return true;
1203}

1205void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
                                        bool SkipSPAttributes) {
// If -fdebug-info-for-profiling is enabled, need to emit the subprogram
// and its source location.
bool SkipSPSourceLocation = SkipSPAttributes &&
                            !CUNode->getDebugInfoForProfiling();
if (!SkipSPSourceLocation)
  if (applySubprogramDefinitionAttributes(SP, SPDie))
    return;

// Constructors and operators for anonymous aggregates do not have names.
if (!SP->getName().empty())
  addString(SPDie, dwarf::DW_AT_name, SP->getName());

if (!SkipSPSourceLocation)
  addSourceLine(SPDie, SP);

// Skip the rest of the attributes under -gmlt to save space.
if (SkipSPAttributes)
  return;

// Add the prototype if we have a prototype and we have a C like
// language.
uint16_t Language = getLanguage();
if (SP->isPrototyped() &&
    (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
     Language == dwarf::DW_LANG_ObjC))
  addFlag(SPDie, dwarf::DW_AT_prototyped);

if (SP->isObjCDirect())
  addFlag(SPDie, dwarf::DW_AT_APPLE_objc_direct);

unsigned CC = 0;
DITypeRefArray Args;
if (const DISubroutineType *SPTy = SP->getType()) {
  Args = SPTy->getTypeArray();
  CC = SPTy->getCC();
}

// Add a DW_AT_calling_convention if this has an explicit convention.
if (CC && CC != dwarf::DW_CC_normal)
  addUInt(SPDie, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1, CC);

// Add a return type. If this is a type like a C/C++ void type we don't add a
// return type.
if (Args.size())
  if (auto Ty = Args[0])
    addType(SPDie, Ty);

unsigned VK = SP->getVirtuality();
if (VK) {
  addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
  if (SP->getVirtualIndex() != -1u) {
    DIELoc *Block = getDIELoc();
    addUInt(*Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
    addUInt(*Block, dwarf::DW_FORM_udata, SP->getVirtualIndex());
    addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
  }
  ContainingTypeMap.insert(std::make_pair(&SPDie, SP->getContainingType()));
}

if (!SP->isDefinition()) {
  addFlag(SPDie, dwarf::DW_AT_declaration);

  // Add arguments. Do not add arguments for subprogram definition. They will
  // be handled while processing variables.
  constructSubprogramArguments(SPDie, Args);
}

addThrownTypes(SPDie, SP->getThrownTypes());

if (SP->isArtificial())
  addFlag(SPDie, dwarf::DW_AT_artificial);

if (!SP->isLocalToUnit())
  addFlag(SPDie, dwarf::DW_AT_external);

if (DD->useAppleExtensionAttributes()) {
  if (SP->isOptimized())
    addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);

  if (unsigned isa = Asm->getISAEncoding())
    addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
}

if (SP->isLValueReference())
  addFlag(SPDie, dwarf::DW_AT_reference);

if (SP->isRValueReference())
  addFlag(SPDie, dwarf::DW_AT_rvalue_reference);

if (SP->isNoReturn())
  addFlag(SPDie, dwarf::DW_AT_noreturn);

if (SP->isProtected())
  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_protected);
else if (SP->isPrivate())
  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_private);
else if (SP->isPublic())
  addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_public);

if (SP->isExplicit())
  addFlag(SPDie, dwarf::DW_AT_explicit);

if (SP->isMainSubprogram())
  addFlag(SPDie, dwarf::DW_AT_main_subprogram);
if (SP->isPure())
  addFlag(SPDie, dwarf::DW_AT_pure);
if (SP->isElemental())
  addFlag(SPDie, dwarf::DW_AT_elemental);
if (SP->isRecursive())
  addFlag(SPDie, dwarf::DW_AT_recursive);

if (DD->getDwarfVersion() >= 5 && SP->isDeleted())
  addFlag(SPDie, dwarf::DW_AT_deleted);
1323}

1325void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,
                                   DIE *IndexTy) {
DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);

// The LowerBound value defines the lower bounds which is typically zero for
// C/C++. The Count value is the number of elements.  Values are 64 bit. If
// Count == -1 then the array is unbounded and we do not emit
// DW_AT_lower_bound and DW_AT_count attributes.
int64_t DefaultLowerBound = getDefaultLowerBound();
int64_t Count = -1;
if (auto *CI = SR->getCount().dyn_cast<ConstantInt*>())
  Count = CI->getSExtValue();

auto addBoundTypeEntry = [&](dwarf::Attribute Attr,
                             DISubrange::BoundType Bound) -> void {
  if (auto *BV = Bound.dyn_cast<DIVariable *>()) {
    if (auto *VarDIE = getDIE(BV))
      addDIEEntry(DW_Subrange, Attr, *VarDIE);
  } else if (auto *BE = Bound.dyn_cast<DIExpression *>()) {
    DIELoc *Loc = new (DIEValueAllocator) DIELoc;
    DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
    DwarfExpr.setMemoryLocationKind();
    DwarfExpr.addExpression(BE);
    addBlock(DW_Subrange, Attr, DwarfExpr.finalize());
  } else if (auto *BI = Bound.dyn_cast<ConstantInt *>()) {
    if (Attr != dwarf::DW_AT_lower_bound || DefaultLowerBound == -1 ||
        BI->getSExtValue() != DefaultLowerBound)
      addSInt(DW_Subrange, Attr, dwarf::DW_FORM_sdata, BI->getSExtValue());
  }
};

addBoundTypeEntry(dwarf::DW_AT_lower_bound, SR->getLowerBound());

if (auto *CV = SR->getCount().dyn_cast<DIVariable*>()) {
  if (auto *CountVarDIE = getDIE(CV))
    addDIEEntry(DW_Subrange, dwarf::DW_AT_count, *CountVarDIE);
} else if (Count != -1)
  addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count);

addBoundTypeEntry(dwarf::DW_AT_upper_bound, SR->getUpperBound());

addBoundTypeEntry(dwarf::DW_AT_byte_stride, SR->getStride());
1368}

1370DIE *DwarfUnit::getIndexTyDie() {
if (IndexTyDie)
  return IndexTyDie;
// Construct an integer type to use for indexes.
IndexTyDie = &createAndAddDIE(dwarf::DW_TAG_base_type, getUnitDie());
StringRef Name = "__ARRAY_SIZE_TYPE__";
addString(*IndexTyDie, dwarf::DW_AT_name, Name);
addUInt(*IndexTyDie, dwarf::DW_AT_byte_size, None, sizeof(int64_t));
addUInt(*IndexTyDie, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
        dwarf::DW_ATE_unsigned);
DD->addAccelType(*CUNode, Name, *IndexTyDie, /*Flags*/ 0);
return IndexTyDie;
1382}

1384/// Returns true if the vector's size differs from the sum of sizes of elements
1385/// the user specified.  This can occur if the vector has been rounded up to
1386/// fit memory alignment constraints.
1387static bool hasVectorBeenPadded(const DICompositeType *CTy) {
assert(CTy && CTy->isVector() && "Composite type is not a vector")((CTy && CTy->isVector() && "Composite type is not a vector"
) ? static_cast<void> (0) : __assert_fail ("CTy && CTy->isVector() && \"Composite type is not a vector\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1388, __PRETTY_FUNCTION__));
const uint64_t ActualSize = CTy->getSizeInBits();

// Obtain the size of each element in the vector.
DIType *BaseTy = CTy->getBaseType();
assert(BaseTy && "Unknown vector element type.")((BaseTy && "Unknown vector element type.") ? static_cast
<void> (0) : __assert_fail ("BaseTy && \"Unknown vector element type.\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1393, __PRETTY_FUNCTION__));
const uint64_t ElementSize = BaseTy->getSizeInBits();

// Locate the number of elements in the vector.
const DINodeArray Elements = CTy->getElements();
assert(Elements.size() == 1 &&((Elements.size() == 1 && Elements[0]->getTag() ==
 dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1400, __PRETTY_FUNCTION__))
       Elements[0]->getTag() == dwarf::DW_TAG_subrange_type &&((Elements.size() == 1 && Elements[0]->getTag() ==
 dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1400, __PRETTY_FUNCTION__))
       "Invalid vector element array, expected one element of type subrange")((Elements.size() == 1 && Elements[0]->getTag() ==
 dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1400, __PRETTY_FUNCTION__));
const auto Subrange = cast<DISubrange>(Elements[0]);
const auto CI = Subrange->getCount().get<ConstantInt *>();
const int32_t NumVecElements = CI->getSExtValue();

// Ensure we found the element count and that the actual size is wide
// enough to contain the requested size.
assert(ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size")((ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size"
) ? static_cast<void> (0) : __assert_fail ("ActualSize >= (NumVecElements * ElementSize) && \"Invalid vector size\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1407, __PRETTY_FUNCTION__));
return ActualSize != (NumVecElements * ElementSize);
1409}

1411void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
if (CTy->isVector()) {
  addFlag(Buffer, dwarf::DW_AT_GNU_vector);
  if (hasVectorBeenPadded(CTy))
    addUInt(Buffer, dwarf::DW_AT_byte_size, None,
            CTy->getSizeInBits() / CHAR_BIT8);
}

if (DIVariable *Var = CTy->getDataLocation()) {
  if (auto *VarDIE = getDIE(Var))
    addDIEEntry(Buffer, dwarf::DW_AT_data_location, *VarDIE);
} else if (DIExpression *Expr = CTy->getDataLocationExp()) {
  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
  DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
  DwarfExpr.setMemoryLocationKind();
  DwarfExpr.addExpression(Expr);
  addBlock(Buffer, dwarf::DW_AT_data_location, DwarfExpr.finalize());
}

if (DIVariable *Var = CTy->getAssociated()) {
  if (auto *VarDIE = getDIE(Var))
    addDIEEntry(Buffer, dwarf::DW_AT_associated, *VarDIE);
} else if (DIExpression *Expr = CTy->getAssociatedExp()) {
  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
  DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
  DwarfExpr.setMemoryLocationKind();
  DwarfExpr.addExpression(Expr);
  addBlock(Buffer, dwarf::DW_AT_associated, DwarfExpr.finalize());
}

if (DIVariable *Var = CTy->getAllocated()) {
  if (auto *VarDIE = getDIE(Var))
    addDIEEntry(Buffer, dwarf::DW_AT_allocated, *VarDIE);
} else if (DIExpression *Expr = CTy->getAllocatedExp()) {
  DIELoc *Loc = new (DIEValueAllocator) DIELoc;
  DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
  DwarfExpr.setMemoryLocationKind();
  DwarfExpr.addExpression(Expr);
  addBlock(Buffer, dwarf::DW_AT_allocated, DwarfExpr.finalize());
}

// Emit the element type.
addType(Buffer, CTy->getBaseType());

// Get an anonymous type for index type.
// FIXME: This type should be passed down from the front end
// as different languages may have different sizes for indexes.
DIE *IdxTy = getIndexTyDie();

// Add subranges to array type.
DINodeArray Elements = CTy->getElements();
for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
  // FIXME: Should this really be such a loose cast?
  if (auto *Element = dyn_cast_or_null<DINode>(Elements[i]))
    if (Element->getTag() == dwarf::DW_TAG_subrange_type)
      constructSubrangeDIE(Buffer, cast<DISubrange>(Element), IdxTy);
}
1468}

1470void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
const DIType *DTy = CTy->getBaseType();
bool IsUnsigned = DTy && isUnsignedDIType(DD, DTy);
if (DTy) {
  if (DD->getDwarfVersion() >= 3)
    addType(Buffer, DTy);
  if (DD->getDwarfVersion() >= 4 && (CTy->getFlags() & DINode::FlagEnumClass))
    addFlag(Buffer, dwarf::DW_AT_enum_class);
}

auto *Context = CTy->getScope();
bool IndexEnumerators = !Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
    isa<DINamespace>(Context) || isa<DICommonBlock>(Context);
DINodeArray Elements = CTy->getElements();

// Add enumerators to enumeration type.
for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
  auto *Enum = dyn_cast_or_null<DIEnumerator>(Elements[i]);
  if (Enum) {
    DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
    StringRef Name = Enum->getName();
    addString(Enumerator, dwarf::DW_AT_name, Name);
    addConstantValue(Enumerator, Enum->getValue(), IsUnsigned);
    if (IndexEnumerators)
      addGlobalName(Name, Enumerator, Context);
  }
}
1497}

1499void DwarfUnit::constructContainingTypeDIEs() {
for (auto CI = ContainingTypeMap.begin(), CE = ContainingTypeMap.end();
     CI != CE; ++CI) {
  DIE &SPDie = *CI->first;
  const DINode *D = CI->second;
  if (!D)
    continue;
  DIE *NDie = getDIE(D);
  if (!NDie)
    continue;
  addDIEEntry(SPDie, dwarf::DW_AT_containing_type, *NDie);
}
1511}

1513DIE &DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
DIE &MemberDie = createAndAddDIE(DT->getTag(), Buffer);
StringRef Name = DT->getName();
if (!Name.empty())
  addString(MemberDie, dwarf::DW_AT_name, Name);

if (DIType *Resolved = DT->getBaseType())
  addType(MemberDie, Resolved);

addSourceLine(MemberDie, DT);

if (DT->getTag() == dwarf::DW_TAG_inheritance && DT->isVirtual()) {

  // For C++, virtual base classes are not at fixed offset. Use following
  // expression to extract appropriate offset from vtable.
  // BaseAddr = ObAddr + *((*ObAddr) - Offset)

  DIELoc *VBaseLocationDie = new (DIEValueAllocator) DIELoc;
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_udata, DT->getOffsetInBits());
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
  addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);

  addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
} else {
  uint64_t Size = DT->getSizeInBits();
  uint64_t FieldSize = DD->getBaseTypeSize(DT);
  uint32_t AlignInBytes = DT->getAlignInBytes();
  uint64_t OffsetInBytes;

  bool IsBitfield = FieldSize && Size != FieldSize;
  if (IsBitfield) {
    // Handle bitfield, assume bytes are 8 bits.
    if (DD->useDWARF2Bitfields())
      addUInt(MemberDie, dwarf::DW_AT_byte_size, None, FieldSize/8);
    addUInt(MemberDie, dwarf::DW_AT_bit_size, None, Size);

    uint64_t Offset = DT->getOffsetInBits();
    // We can't use DT->getAlignInBits() here: AlignInBits for member type
    // is non-zero if and only if alignment was forced (e.g. _Alignas()),
    // which can't be done with bitfields. Thus we use FieldSize here.
    uint32_t AlignInBits = FieldSize;
    uint32_t AlignMask = ~(AlignInBits - 1);
    // The bits from the start of the storage unit to the start of the field.
    uint64_t StartBitOffset = Offset - (Offset & AlignMask);
    // The byte offset of the field's aligned storage unit inside the struct.
    OffsetInBytes = (Offset - StartBitOffset) / 8;

    if (DD->useDWARF2Bitfields()) {
      uint64_t HiMark = (Offset + FieldSize) & AlignMask;
      uint64_t FieldOffset = (HiMark - FieldSize);
      Offset -= FieldOffset;

      // Maybe we need to work from the other end.
      if (Asm->getDataLayout().isLittleEndian())
        Offset = FieldSize - (Offset + Size);

      addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
      OffsetInBytes = FieldOffset >> 3;
    } else {
      addUInt(MemberDie, dwarf::DW_AT_data_bit_offset, None, Offset);
    }
  } else {
    // This is not a bitfield.
    OffsetInBytes = DT->getOffsetInBits() / 8;
    if (AlignInBytes)
      addUInt(MemberDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
              AlignInBytes);
  }

  if (DD->getDwarfVersion() <= 2) {
    DIELoc *MemLocationDie = new (DIEValueAllocator) DIELoc;
    addUInt(*MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
    addUInt(*MemLocationDie, dwarf::DW_FORM_udata, OffsetInBytes);
    addBlock(MemberDie, dwarf::DW_AT_data_member_location, MemLocationDie);
  } else if (!IsBitfield || DD->useDWARF2Bitfields())
    addUInt(MemberDie, dwarf::DW_AT_data_member_location, None,
            OffsetInBytes);
}

if (DT->isProtected())
  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_protected);
else if (DT->isPrivate())
  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_private);
// Otherwise C++ member and base classes are considered public.
else if (DT->isPublic())
  addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_public);
if (DT->isVirtual())
  addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
          dwarf::DW_VIRTUALITY_virtual);

// Objective-C properties.
if (DINode *PNode = DT->getObjCProperty())
  if (DIE *PDie = getDIE(PNode))
    MemberDie.addValue(DIEValueAllocator, dwarf::DW_AT_APPLE_property,
                       dwarf::DW_FORM_ref4, DIEEntry(*PDie));

if (DT->isArtificial())
  addFlag(MemberDie, dwarf::DW_AT_artificial);

return MemberDie;
1620}

1622DIE *DwarfUnit::getOrCreateStaticMemberDIE(const DIDerivedType *DT) {
if (!DT)
  return nullptr;

// Construct the context before querying for the existence of the DIE in case
// such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(DT->getScope());
assert(dwarf::isType(ContextDIE->getTag()) &&((dwarf::isType(ContextDIE->getTag()) && "Static member should belong to a type."
) ? static_cast<void> (0) : __assert_fail ("dwarf::isType(ContextDIE->getTag()) && \"Static member should belong to a type.\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1630, __PRETTY_FUNCTION__))
       "Static member should belong to a type.")((dwarf::isType(ContextDIE->getTag()) && "Static member should belong to a type."
) ? static_cast<void> (0) : __assert_fail ("dwarf::isType(ContextDIE->getTag()) && \"Static member should belong to a type.\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1630, __PRETTY_FUNCTION__));

if (DIE *StaticMemberDIE = getDIE(DT))
  return StaticMemberDIE;

DIE &StaticMemberDIE = createAndAddDIE(DT->getTag(), *ContextDIE, DT);

const DIType *Ty = DT->getBaseType();

addString(StaticMemberDIE, dwarf::DW_AT_name, DT->getName());
addType(StaticMemberDIE, Ty);
addSourceLine(StaticMemberDIE, DT);
addFlag(StaticMemberDIE, dwarf::DW_AT_external);
addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);

// FIXME: We could omit private if the parent is a class_type, and
// public if the parent is something else.
if (DT->isProtected())
  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_protected);
else if (DT->isPrivate())
  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_private);
else if (DT->isPublic())
  addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
          dwarf::DW_ACCESS_public);

if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT->getConstant()))
  addConstantValue(StaticMemberDIE, CI, Ty);
if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT->getConstant()))
  addConstantFPValue(StaticMemberDIE, CFP);

if (uint32_t AlignInBytes = DT->getAlignInBytes())
  addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
          AlignInBytes);

return &StaticMemberDIE;
1667}

1669void DwarfUnit::emitCommonHeader(bool UseOffsets, dwarf::UnitType UT) {
// Emit size of content not including length itself
Asm->OutStreamer->AddComment("Length of Unit");
if (!DD->useSectionsAsReferences()) {
  StringRef Prefix = isDwoUnit() ? "debug_info_dwo_" : "debug_info_";
  MCSymbol *BeginLabel = Asm->createTempSymbol(Prefix + "start");
  EndLabel = Asm->createTempSymbol(Prefix + "end");
  Asm->emitLabelDifference(EndLabel, BeginLabel, 4);
  Asm->OutStreamer->emitLabel(BeginLabel);
} else
  Asm->emitInt32(getHeaderSize() + getUnitDie().getSize());

Asm->OutStreamer->AddComment("DWARF version number");
unsigned Version = DD->getDwarfVersion();
Asm->emitInt16(Version);

// DWARF v5 reorders the address size and adds a unit type.
if (Version >= 5) {
  Asm->OutStreamer->AddComment("DWARF Unit Type");
  Asm->emitInt8(UT);
  Asm->OutStreamer->AddComment("Address Size (in bytes)");
  Asm->emitInt8(Asm->MAI->getCodePointerSize());
}

// We share one abbreviations table across all units so it's always at the
// start of the section. Use a relocatable offset where needed to ensure
// linking doesn't invalidate that offset.
Asm->OutStreamer->AddComment("Offset Into Abbrev. Section");
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
if (UseOffsets)
  Asm->emitInt32(0);
else
  Asm->emitDwarfSymbolReference(
      TLOF.getDwarfAbbrevSection()->getBeginSymbol(), false);

if (Version <= 4) {
  Asm->OutStreamer->AddComment("Address Size (in bytes)");
  Asm->emitInt8(Asm->MAI->getCodePointerSize());
}
1708}

1710void DwarfTypeUnit::emitHeader(bool UseOffsets) {
DwarfUnit::emitCommonHeader(UseOffsets,
                            DD->useSplitDwarf() ? dwarf::DW_UT_split_type
                                                : dwarf::DW_UT_type);
Asm->OutStreamer->AddComment("Type Signature");
Asm->OutStreamer->emitIntValue(TypeSignature, sizeof(TypeSignature));
Asm->OutStreamer->AddComment("Type DIE Offset");
// In a skeleton type unit there is no type DIE so emit a zero offset.
Asm->OutStreamer->emitIntValue(Ty ? Ty->getOffset() : 0,
                               sizeof(Ty->getOffset()));
1720}

1722DIE::value_iterator
1723DwarfUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
                         const MCSymbol *Hi, const MCSymbol *Lo) {
return Die.addValue(DIEValueAllocator, Attribute,
                    DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
                                               : dwarf::DW_FORM_data4,
                    new (DIEValueAllocator) DIEDelta(Hi, Lo));
1729}

1731DIE::value_iterator
1732DwarfUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
                         const MCSymbol *Label, const MCSymbol *Sec) {
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
  return addLabel(Die, Attribute,
                  DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
                                             : dwarf::DW_FORM_data4,
                  Label);
return addSectionDelta(Die, Attribute, Label, Sec);
1740}

1742bool DwarfTypeUnit::isDwoUnit() const {
// Since there are no skeleton type units, all type units are dwo type units
// when split DWARF is being used.
return DD->useSplitDwarf();
1746}

1748void DwarfTypeUnit::addGlobalName(StringRef Name, const DIE &Die,
                                const DIScope *Context) {
getCU().addGlobalNameForTypeUnit(Name, Context);
1751}

1753void DwarfTypeUnit::addGlobalType(const DIType *Ty, const DIE &Die,
                                const DIScope *Context) {
getCU().addGlobalTypeUnitType(Ty, Context);
1756}

1758const MCSymbol *DwarfUnit::getCrossSectionRelativeBaseAddress() const {
if (!Asm->MAI->doesDwarfUseRelocationsAcrossSections())
  return nullptr;
if (isDwoUnit())
  return nullptr;
return getSection()->getBeginSymbol();
1764}

1766void DwarfUnit::addStringOffsetsStart() {
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
addSectionLabel(getUnitDie(), dwarf::DW_AT_str_offsets_base,
                DU->getStringOffsetsStartSym(),
                TLOF.getDwarfStrOffSection()->getBeginSymbol());
1771}

1773void DwarfUnit::addRnglistsBase() {
assert(DD->getDwarfVersion() >= 5 &&((DD->getDwarfVersion() >= 5 && "DW_AT_rnglists_base requires DWARF version 5 or later"
) ? static_cast<void> (0) : __assert_fail ("DD->getDwarfVersion() >= 5 && \"DW_AT_rnglists_base requires DWARF version 5 or later\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1775, __PRETTY_FUNCTION__))
       "DW_AT_rnglists_base requires DWARF version 5 or later")((DD->getDwarfVersion() >= 5 && "DW_AT_rnglists_base requires DWARF version 5 or later"
) ? static_cast<void> (0) : __assert_fail ("DD->getDwarfVersion() >= 5 && \"DW_AT_rnglists_base requires DWARF version 5 or later\""
, "/build/llvm-toolchain-snapshot-12~++20200806111125+5446ec85070/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1775, __PRETTY_FUNCTION__));
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
addSectionLabel(getUnitDie(), dwarf::DW_AT_rnglists_base,
                DU->getRnglistsTableBaseSym(),
                TLOF.getDwarfRnglistsSection()->getBeginSymbol());
1780}

1782void DwarfTypeUnit::finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) {
addFlag(D, dwarf::DW_AT_declaration);
StringRef Name = CTy->getName();
if (!Name.empty())
1
Assuming the condition is false→
2
←
Taking false branch→
  addString(D, dwarf::DW_AT_name, Name);
getCU().createTypeDIE(CTy);
3
←
Calling 'DwarfUnit::createTypeDIE'→
1788}