1 //===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file contains support for constructing a dwarf compile unit.
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"
47 #define DEBUG_TYPE "dwarfdebug"
49 DIEDwarfExpression::DIEDwarfExpression(const AsmPrinter &AP,
50 DwarfCompileUnit &CU, DIELoc &DIE)
51 : DwarfExpression(AP.getDwarfVersion(), CU), AP(AP), OutDIE(DIE) {}
53 void DIEDwarfExpression::emitOp(uint8_t Op, const char* Comment) {
54 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Op);
57 void DIEDwarfExpression::emitSigned(int64_t Value) {
58 CU.addSInt(getActiveDIE(), dwarf::DW_FORM_sdata, Value);
61 void DIEDwarfExpression::emitUnsigned(uint64_t Value) {
62 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_udata, Value);
65 void DIEDwarfExpression::emitData1(uint8_t Value) {
66 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Value);
69 void DIEDwarfExpression::emitBaseTypeRef(uint64_t Idx) {
70 CU.addBaseTypeRef(getActiveDIE(), Idx);
73 void DIEDwarfExpression::enableTemporaryBuffer() {
74 assert(!IsBuffering && "Already buffering?");
78 void DIEDwarfExpression::disableTemporaryBuffer() { IsBuffering = false; }
80 unsigned DIEDwarfExpression::getTemporaryBufferSize() {
81 return TmpDIE.ComputeSize(&AP);
84 void DIEDwarfExpression::commitTemporaryBuffer() { OutDIE.takeValues(TmpDIE); }
86 bool DIEDwarfExpression::isFrameRegister(const TargetRegisterInfo &TRI,
87 unsigned MachineReg) {
88 return MachineReg == TRI.getFrameRegister(*AP.MF);
91 DwarfUnit::DwarfUnit(dwarf::Tag UnitTag, const DICompileUnit *Node,
92 AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
93 : DIEUnit(A->getDwarfVersion(), A->MAI->getCodePointerSize(), UnitTag),
94 CUNode(Node), Asm(A), DD(DW), DU(DWU), IndexTyDie(nullptr) {
97 DwarfTypeUnit::DwarfTypeUnit(DwarfCompileUnit &CU, AsmPrinter *A,
98 DwarfDebug *DW, DwarfFile *DWU,
99 MCDwarfDwoLineTable *SplitLineTable)
100 : DwarfUnit(dwarf::DW_TAG_type_unit, CU.getCUNode(), A, DW, DWU), CU(CU),
101 SplitLineTable(SplitLineTable) {
104 DwarfUnit::~DwarfUnit() {
105 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
106 DIEBlocks[j]->~DIEBlock();
107 for (unsigned j = 0, M = DIELocs.size(); j < M; ++j)
108 DIELocs[j]->~DIELoc();
111 int64_t DwarfUnit::getDefaultLowerBound() const {
112 switch (getLanguage()) {
116 // The languages below have valid values in all DWARF versions.
117 case dwarf::DW_LANG_C:
118 case dwarf::DW_LANG_C89:
119 case dwarf::DW_LANG_C_plus_plus:
122 case dwarf::DW_LANG_Fortran77:
123 case dwarf::DW_LANG_Fortran90:
126 // The languages below have valid values only if the DWARF version >= 3.
127 case dwarf::DW_LANG_C99:
128 case dwarf::DW_LANG_ObjC:
129 case dwarf::DW_LANG_ObjC_plus_plus:
130 if (DD->getDwarfVersion() >= 3)
134 case dwarf::DW_LANG_Fortran95:
135 if (DD->getDwarfVersion() >= 3)
139 // Starting with DWARF v4, all defined languages have valid values.
140 case dwarf::DW_LANG_D:
141 case dwarf::DW_LANG_Java:
142 case dwarf::DW_LANG_Python:
143 case dwarf::DW_LANG_UPC:
144 if (DD->getDwarfVersion() >= 4)
148 case dwarf::DW_LANG_Ada83:
149 case dwarf::DW_LANG_Ada95:
150 case dwarf::DW_LANG_Cobol74:
151 case dwarf::DW_LANG_Cobol85:
152 case dwarf::DW_LANG_Modula2:
153 case dwarf::DW_LANG_Pascal83:
154 case dwarf::DW_LANG_PLI:
155 if (DD->getDwarfVersion() >= 4)
159 // The languages below are new in DWARF v5.
160 case dwarf::DW_LANG_BLISS:
161 case dwarf::DW_LANG_C11:
162 case dwarf::DW_LANG_C_plus_plus_03:
163 case dwarf::DW_LANG_C_plus_plus_11:
164 case dwarf::DW_LANG_C_plus_plus_14:
165 case dwarf::DW_LANG_Dylan:
166 case dwarf::DW_LANG_Go:
167 case dwarf::DW_LANG_Haskell:
168 case dwarf::DW_LANG_OCaml:
169 case dwarf::DW_LANG_OpenCL:
170 case dwarf::DW_LANG_RenderScript:
171 case dwarf::DW_LANG_Rust:
172 case dwarf::DW_LANG_Swift:
173 if (DD->getDwarfVersion() >= 5)
177 case dwarf::DW_LANG_Fortran03:
178 case dwarf::DW_LANG_Fortran08:
179 case dwarf::DW_LANG_Julia:
180 case dwarf::DW_LANG_Modula3:
181 if (DD->getDwarfVersion() >= 5)
189 /// Check whether the DIE for this MDNode can be shared across CUs.
190 bool DwarfUnit::isShareableAcrossCUs(const DINode *D) const {
191 // When the MDNode can be part of the type system (this includes subprogram
192 // declarations *and* subprogram definitions, even local definitions), the
193 // DIE must be shared across CUs.
194 // Combining type units and cross-CU DIE sharing is lower value (since
195 // cross-CU DIE sharing is used in LTO and removes type redundancy at that
196 // level already) but may be implementable for some value in projects
197 // building multiple independent libraries with LTO and then linking those
199 if (isDwoUnit() && !DD->shareAcrossDWOCUs())
201 return (isa<DIType>(D) || isa<DISubprogram>(D)) && !DD->generateTypeUnits();
204 DIE *DwarfUnit::getDIE(const DINode *D) const {
205 if (isShareableAcrossCUs(D))
206 return DU->getDIE(D);
207 return MDNodeToDieMap.lookup(D);
210 void DwarfUnit::insertDIE(const DINode *Desc, DIE *D) {
211 if (isShareableAcrossCUs(Desc)) {
212 DU->insertDIE(Desc, D);
215 MDNodeToDieMap.insert(std::make_pair(Desc, D));
218 void DwarfUnit::insertDIE(DIE *D) {
219 MDNodeToDieMap.insert(std::make_pair(nullptr, D));
222 void DwarfUnit::addFlag(DIE &Die, dwarf::Attribute Attribute) {
223 if (DD->getDwarfVersion() >= 4)
224 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag_present,
227 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag,
231 void DwarfUnit::addUInt(DIEValueList &Die, dwarf::Attribute Attribute,
232 Optional<dwarf::Form> Form, uint64_t Integer) {
234 Form = DIEInteger::BestForm(false, Integer);
235 assert(Form != dwarf::DW_FORM_implicit_const &&
236 "DW_FORM_implicit_const is used only for signed integers");
237 Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
240 void DwarfUnit::addUInt(DIEValueList &Block, dwarf::Form Form,
242 addUInt(Block, (dwarf::Attribute)0, Form, Integer);
245 void DwarfUnit::addSInt(DIEValueList &Die, dwarf::Attribute Attribute,
246 Optional<dwarf::Form> Form, int64_t Integer) {
248 Form = DIEInteger::BestForm(true, Integer);
249 Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
252 void DwarfUnit::addSInt(DIELoc &Die, Optional<dwarf::Form> Form,
254 addSInt(Die, (dwarf::Attribute)0, Form, Integer);
257 void DwarfUnit::addString(DIE &Die, dwarf::Attribute Attribute,
259 if (CUNode->isDebugDirectivesOnly())
262 if (DD->useInlineStrings()) {
263 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_string,
264 new (DIEValueAllocator)
265 DIEInlineString(String, DIEValueAllocator));
269 isDwoUnit() ? dwarf::DW_FORM_GNU_str_index : dwarf::DW_FORM_strp;
271 auto StringPoolEntry =
272 useSegmentedStringOffsetsTable() || IxForm == dwarf::DW_FORM_GNU_str_index
273 ? DU->getStringPool().getIndexedEntry(*Asm, String)
274 : DU->getStringPool().getEntry(*Asm, String);
276 // For DWARF v5 and beyond, use the smallest strx? form possible.
277 if (useSegmentedStringOffsetsTable()) {
278 IxForm = dwarf::DW_FORM_strx1;
279 unsigned Index = StringPoolEntry.getIndex();
280 if (Index > 0xffffff)
281 IxForm = dwarf::DW_FORM_strx4;
282 else if (Index > 0xffff)
283 IxForm = dwarf::DW_FORM_strx3;
284 else if (Index > 0xff)
285 IxForm = dwarf::DW_FORM_strx2;
287 Die.addValue(DIEValueAllocator, Attribute, IxForm,
288 DIEString(StringPoolEntry));
291 DIEValueList::value_iterator DwarfUnit::addLabel(DIEValueList &Die,
292 dwarf::Attribute Attribute,
294 const MCSymbol *Label) {
295 return Die.addValue(DIEValueAllocator, Attribute, Form, DIELabel(Label));
298 void DwarfUnit::addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label) {
299 addLabel(Die, (dwarf::Attribute)0, Form, Label);
302 void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute,
304 if (DD->getDwarfVersion() >= 4)
305 addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
307 addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
310 Optional<MD5::MD5Result> DwarfUnit::getMD5AsBytes(const DIFile *File) const {
312 if (DD->getDwarfVersion() < 5)
314 Optional<DIFile::ChecksumInfo<StringRef>> Checksum = File->getChecksum();
315 if (!Checksum || Checksum->Kind != DIFile::CSK_MD5)
318 // Convert the string checksum to an MD5Result for the streamer.
319 // The verifier validates the checksum so we assume it's okay.
320 // An MD5 checksum is 16 bytes.
321 std::string ChecksumString = fromHex(Checksum->Value);
322 MD5::MD5Result CKMem;
323 std::copy(ChecksumString.begin(), ChecksumString.end(), CKMem.Bytes.data());
327 unsigned DwarfTypeUnit::getOrCreateSourceID(const DIFile *File) {
329 return getCU().getOrCreateSourceID(File);
330 if (!UsedLineTable) {
331 UsedLineTable = true;
332 // This is a split type unit that needs a line table.
333 addSectionOffset(getUnitDie(), dwarf::DW_AT_stmt_list, 0);
335 return SplitLineTable->getFile(File->getDirectory(), File->getFilename(),
337 Asm->OutContext.getDwarfVersion(),
341 void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) {
342 if (DD->getDwarfVersion() >= 5) {
343 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addrx);
344 addUInt(Die, dwarf::DW_FORM_addrx, DD->getAddressPool().getIndex(Sym));
348 if (DD->useSplitDwarf()) {
349 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
350 addUInt(Die, dwarf::DW_FORM_GNU_addr_index,
351 DD->getAddressPool().getIndex(Sym));
355 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
356 addLabel(Die, dwarf::DW_FORM_udata, Sym);
359 void DwarfUnit::addLabelDelta(DIE &Die, dwarf::Attribute Attribute,
360 const MCSymbol *Hi, const MCSymbol *Lo) {
361 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_data4,
362 new (DIEValueAllocator) DIEDelta(Hi, Lo));
365 void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry) {
366 addDIEEntry(Die, Attribute, DIEEntry(Entry));
369 void DwarfUnit::addDIETypeSignature(DIE &Die, uint64_t Signature) {
370 // Flag the type unit reference as a declaration so that if it contains
371 // members (implicit special members, static data member definitions, member
372 // declarations for definitions in this CU, etc) consumers don't get confused
373 // and think this is a full definition.
374 addFlag(Die, dwarf::DW_AT_declaration);
376 Die.addValue(DIEValueAllocator, dwarf::DW_AT_signature,
377 dwarf::DW_FORM_ref_sig8, DIEInteger(Signature));
380 void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute,
382 const DIEUnit *CU = Die.getUnit();
383 const DIEUnit *EntryCU = Entry.getEntry().getUnit();
385 // We assume that Die belongs to this CU, if it is not linked to any CU yet.
386 CU = getUnitDie().getUnit();
388 EntryCU = getUnitDie().getUnit();
389 Die.addValue(DIEValueAllocator, Attribute,
390 EntryCU == CU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
394 DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N) {
395 DIE &Die = Parent.addChild(DIE::get(DIEValueAllocator, (dwarf::Tag)Tag));
401 void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc) {
402 Loc->ComputeSize(Asm);
403 DIELocs.push_back(Loc); // Memoize so we can call the destructor later on.
404 Die.addValue(DIEValueAllocator, Attribute,
405 Loc->BestForm(DD->getDwarfVersion()), Loc);
408 void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute,
410 Block->ComputeSize(Asm);
411 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
412 Die.addValue(DIEValueAllocator, Attribute, Block->BestForm(), Block);
415 void DwarfUnit::addSourceLine(DIE &Die, unsigned Line, const DIFile *File) {
419 unsigned FileID = getOrCreateSourceID(File);
420 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
421 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
424 void DwarfUnit::addSourceLine(DIE &Die, const DILocalVariable *V) {
427 addSourceLine(Die, V->getLine(), V->getFile());
430 void DwarfUnit::addSourceLine(DIE &Die, const DIGlobalVariable *G) {
433 addSourceLine(Die, G->getLine(), G->getFile());
436 void DwarfUnit::addSourceLine(DIE &Die, const DISubprogram *SP) {
439 addSourceLine(Die, SP->getLine(), SP->getFile());
442 void DwarfUnit::addSourceLine(DIE &Die, const DILabel *L) {
445 addSourceLine(Die, L->getLine(), L->getFile());
448 void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
451 addSourceLine(Die, Ty->getLine(), Ty->getFile());
454 void DwarfUnit::addSourceLine(DIE &Die, const DIObjCProperty *Ty) {
457 addSourceLine(Die, Ty->getLine(), Ty->getFile());
460 /// Return true if type encoding is unsigned.
461 static bool isUnsignedDIType(DwarfDebug *DD, const DIType *Ty) {
462 if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
463 // FIXME: Enums without a fixed underlying type have unknown signedness
464 // here, leading to incorrectly emitted constants.
465 if (CTy->getTag() == dwarf::DW_TAG_enumeration_type)
468 // (Pieces of) aggregate types that get hacked apart by SROA may be
469 // represented by a constant. Encode them as unsigned bytes.
473 if (auto *DTy = dyn_cast<DIDerivedType>(Ty)) {
474 dwarf::Tag T = (dwarf::Tag)Ty->getTag();
475 // Encode pointer constants as unsigned bytes. This is used at least for
476 // null pointer constant emission.
477 // FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
478 // here, but accept them for now due to a bug in SROA producing bogus
480 if (T == dwarf::DW_TAG_pointer_type ||
481 T == dwarf::DW_TAG_ptr_to_member_type ||
482 T == dwarf::DW_TAG_reference_type ||
483 T == dwarf::DW_TAG_rvalue_reference_type)
485 assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||
486 T == dwarf::DW_TAG_volatile_type ||
487 T == dwarf::DW_TAG_restrict_type || T == dwarf::DW_TAG_atomic_type);
488 assert(DTy->getBaseType() && "Expected valid base type");
489 return isUnsignedDIType(DD, DTy->getBaseType());
492 auto *BTy = cast<DIBasicType>(Ty);
493 unsigned Encoding = BTy->getEncoding();
494 assert((Encoding == dwarf::DW_ATE_unsigned ||
495 Encoding == dwarf::DW_ATE_unsigned_char ||
496 Encoding == dwarf::DW_ATE_signed ||
497 Encoding == dwarf::DW_ATE_signed_char ||
498 Encoding == dwarf::DW_ATE_float || Encoding == dwarf::DW_ATE_UTF ||
499 Encoding == dwarf::DW_ATE_boolean ||
500 (Ty->getTag() == dwarf::DW_TAG_unspecified_type &&
501 Ty->getName() == "decltype(nullptr)")) &&
502 "Unsupported encoding");
503 return Encoding == dwarf::DW_ATE_unsigned ||
504 Encoding == dwarf::DW_ATE_unsigned_char ||
505 Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean ||
506 Ty->getTag() == dwarf::DW_TAG_unspecified_type;
509 void DwarfUnit::addConstantFPValue(DIE &Die, const MachineOperand &MO) {
510 assert(MO.isFPImm() && "Invalid machine operand!");
511 DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
512 APFloat FPImm = MO.getFPImm()->getValueAPF();
514 // Get the raw data form of the floating point.
515 const APInt FltVal = FPImm.bitcastToAPInt();
516 const char *FltPtr = (const char *)FltVal.getRawData();
518 int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
519 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
520 int Incr = (LittleEndian ? 1 : -1);
521 int Start = (LittleEndian ? 0 : NumBytes - 1);
522 int Stop = (LittleEndian ? NumBytes : -1);
524 // Output the constant to DWARF one byte at a time.
525 for (; Start != Stop; Start += Incr)
526 addUInt(*Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
528 addBlock(Die, dwarf::DW_AT_const_value, Block);
531 void DwarfUnit::addConstantFPValue(DIE &Die, const ConstantFP *CFP) {
532 // Pass this down to addConstantValue as an unsigned bag of bits.
533 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
536 void DwarfUnit::addConstantValue(DIE &Die, const ConstantInt *CI,
538 addConstantValue(Die, CI->getValue(), Ty);
541 void DwarfUnit::addConstantValue(DIE &Die, const MachineOperand &MO,
543 assert(MO.isImm() && "Invalid machine operand!");
545 addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
548 void DwarfUnit::addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty) {
549 addConstantValue(Die, isUnsignedDIType(DD, Ty), Val);
552 void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
553 // FIXME: This is a bit conservative/simple - it emits negative values always
554 // sign extended to 64 bits rather than minimizing the number of bytes.
555 addUInt(Die, dwarf::DW_AT_const_value,
556 Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
559 void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty) {
560 addConstantValue(Die, Val, isUnsignedDIType(DD, Ty));
563 void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, bool Unsigned) {
564 unsigned CIBitWidth = Val.getBitWidth();
565 if (CIBitWidth <= 64) {
566 addConstantValue(Die, Unsigned,
567 Unsigned ? Val.getZExtValue() : Val.getSExtValue());
571 DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
573 // Get the raw data form of the large APInt.
574 const uint64_t *Ptr64 = Val.getRawData();
576 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
577 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
579 // Output the constant to DWARF one byte at a time.
580 for (int i = 0; i < NumBytes; i++) {
583 c = Ptr64[i / 8] >> (8 * (i & 7));
585 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
586 addUInt(*Block, dwarf::DW_FORM_data1, c);
589 addBlock(Die, dwarf::DW_AT_const_value, Block);
592 void DwarfUnit::addLinkageName(DIE &Die, StringRef LinkageName) {
593 if (!LinkageName.empty())
595 DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
596 : dwarf::DW_AT_MIPS_linkage_name,
597 GlobalValue::dropLLVMManglingEscape(LinkageName));
600 void DwarfUnit::addTemplateParams(DIE &Buffer, DINodeArray TParams) {
601 // Add template parameters.
602 for (const auto *Element : TParams) {
603 if (auto *TTP = dyn_cast<DITemplateTypeParameter>(Element))
604 constructTemplateTypeParameterDIE(Buffer, TTP);
605 else if (auto *TVP = dyn_cast<DITemplateValueParameter>(Element))
606 constructTemplateValueParameterDIE(Buffer, TVP);
610 /// Add thrown types.
611 void DwarfUnit::addThrownTypes(DIE &Die, DINodeArray ThrownTypes) {
612 for (const auto *Ty : ThrownTypes) {
613 DIE &TT = createAndAddDIE(dwarf::DW_TAG_thrown_type, Die);
614 addType(TT, cast<DIType>(Ty));
618 DIE *DwarfUnit::getOrCreateContextDIE(const DIScope *Context) {
619 if (!Context || isa<DIFile>(Context))
620 return &getUnitDie();
621 if (auto *T = dyn_cast<DIType>(Context))
622 return getOrCreateTypeDIE(T);
623 if (auto *NS = dyn_cast<DINamespace>(Context))
624 return getOrCreateNameSpace(NS);
625 if (auto *SP = dyn_cast<DISubprogram>(Context))
626 return getOrCreateSubprogramDIE(SP);
627 if (auto *M = dyn_cast<DIModule>(Context))
628 return getOrCreateModule(M);
629 return getDIE(Context);
632 DIE *DwarfUnit::createTypeDIE(const DICompositeType *Ty) {
633 auto *Context = Ty->getScope();
634 DIE *ContextDIE = getOrCreateContextDIE(Context);
636 if (DIE *TyDIE = getDIE(Ty))
640 DIE &TyDIE = createAndAddDIE(Ty->getTag(), *ContextDIE, Ty);
642 constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
644 updateAcceleratorTables(Context, Ty, TyDIE);
648 DIE *DwarfUnit::createTypeDIE(const DIScope *Context, DIE &ContextDIE,
651 DIE &TyDIE = createAndAddDIE(Ty->getTag(), ContextDIE, Ty);
653 updateAcceleratorTables(Context, Ty, TyDIE);
655 if (auto *BT = dyn_cast<DIBasicType>(Ty))
656 constructTypeDIE(TyDIE, BT);
657 else if (auto *STy = dyn_cast<DISubroutineType>(Ty))
658 constructTypeDIE(TyDIE, STy);
659 else if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
660 if (DD->generateTypeUnits() && !Ty->isForwardDecl() &&
661 (Ty->getRawName() || CTy->getRawIdentifier())) {
662 // Skip updating the accelerator tables since this is not the full type.
663 if (MDString *TypeId = CTy->getRawIdentifier())
664 DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
666 auto X = DD->enterNonTypeUnitContext();
667 finishNonUnitTypeDIE(TyDIE, CTy);
671 constructTypeDIE(TyDIE, CTy);
673 constructTypeDIE(TyDIE, cast<DIDerivedType>(Ty));
679 DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
683 auto *Ty = cast<DIType>(TyNode);
685 // DW_TAG_restrict_type is not supported in DWARF2
686 if (Ty->getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
687 return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
689 // DW_TAG_atomic_type is not supported in DWARF < 5
690 if (Ty->getTag() == dwarf::DW_TAG_atomic_type && DD->getDwarfVersion() < 5)
691 return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
693 // Construct the context before querying for the existence of the DIE in case
694 // such construction creates the DIE.
695 auto *Context = Ty->getScope();
696 DIE *ContextDIE = getOrCreateContextDIE(Context);
699 if (DIE *TyDIE = getDIE(Ty))
702 return static_cast<DwarfUnit *>(ContextDIE->getUnit())
703 ->createTypeDIE(Context, *ContextDIE, Ty);
706 void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
707 const DIType *Ty, const DIE &TyDIE) {
708 if (!Ty->getName().empty() && !Ty->isForwardDecl()) {
709 bool IsImplementation = false;
710 if (auto *CT = dyn_cast<DICompositeType>(Ty)) {
711 // A runtime language of 0 actually means C/C++ and that any
712 // non-negative value is some version of Objective-C/C++.
713 IsImplementation = CT->getRuntimeLang() == 0 || CT->isObjcClassComplete();
715 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
716 DD->addAccelType(*CUNode, Ty->getName(), TyDIE, Flags);
718 if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
719 isa<DINamespace>(Context) || isa<DICommonBlock>(Context))
720 addGlobalType(Ty, TyDIE, Context);
724 void DwarfUnit::addType(DIE &Entity, const DIType *Ty,
725 dwarf::Attribute Attribute) {
726 assert(Ty && "Trying to add a type that doesn't exist?");
727 addDIEEntry(Entity, Attribute, DIEEntry(*getOrCreateTypeDIE(Ty)));
730 std::string DwarfUnit::getParentContextString(const DIScope *Context) const {
734 // FIXME: Decide whether to implement this for non-C++ languages.
735 if (!dwarf::isCPlusPlus((dwarf::SourceLanguage)getLanguage()))
739 SmallVector<const DIScope *, 1> Parents;
740 while (!isa<DICompileUnit>(Context)) {
741 Parents.push_back(Context);
742 if (const DIScope *S = Context->getScope())
745 // Structure, etc types will have a NULL context if they're at the top
750 // Reverse iterate over our list to go from the outermost construct to the
752 for (const DIScope *Ctx : make_range(Parents.rbegin(), Parents.rend())) {
753 StringRef Name = Ctx->getName();
754 if (Name.empty() && isa<DINamespace>(Ctx))
755 Name = "(anonymous namespace)";
764 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIBasicType *BTy) {
765 // Get core information.
766 StringRef Name = BTy->getName();
767 // Add name if not anonymous or intermediate type.
769 addString(Buffer, dwarf::DW_AT_name, Name);
771 // An unspecified type only has a name attribute.
772 if (BTy->getTag() == dwarf::DW_TAG_unspecified_type)
775 addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
778 uint64_t Size = BTy->getSizeInBits() >> 3;
779 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
781 if (BTy->isBigEndian())
782 addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_big);
783 else if (BTy->isLittleEndian())
784 addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_little);
787 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
788 // Get core information.
789 StringRef Name = DTy->getName();
790 uint64_t Size = DTy->getSizeInBits() >> 3;
791 uint16_t Tag = Buffer.getTag();
793 // Map to main type, void will not have a type.
794 const DIType *FromTy = DTy->getBaseType();
796 addType(Buffer, FromTy);
798 // Add name if not anonymous or intermediate type.
800 addString(Buffer, dwarf::DW_AT_name, Name);
802 // If alignment is specified for a typedef , create and insert DW_AT_alignment
803 // attribute in DW_TAG_typedef DIE.
804 if (Tag == dwarf::DW_TAG_typedef && DD->getDwarfVersion() >= 5) {
805 uint32_t AlignInBytes = DTy->getAlignInBytes();
806 if (AlignInBytes > 0)
807 addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
811 // Add size if non-zero (derived types might be zero-sized.)
812 if (Size && Tag != dwarf::DW_TAG_pointer_type
813 && Tag != dwarf::DW_TAG_ptr_to_member_type
814 && Tag != dwarf::DW_TAG_reference_type
815 && Tag != dwarf::DW_TAG_rvalue_reference_type)
816 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
818 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
819 addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
820 *getOrCreateTypeDIE(cast<DIDerivedType>(DTy)->getClassType()));
821 // Add source line info if available and TyDesc is not a forward declaration.
822 if (!DTy->isForwardDecl())
823 addSourceLine(Buffer, DTy);
825 // If DWARF address space value is other than None, add it. The IR
826 // verifier checks that DWARF address space only exists for pointer
827 // or reference types.
828 if (DTy->getDWARFAddressSpace())
829 addUInt(Buffer, dwarf::DW_AT_address_class, dwarf::DW_FORM_data4,
830 DTy->getDWARFAddressSpace().getValue());
833 void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args) {
834 for (unsigned i = 1, N = Args.size(); i < N; ++i) {
835 const DIType *Ty = Args[i];
837 assert(i == N-1 && "Unspecified parameter must be the last argument");
838 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
840 DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
842 if (Ty->isArtificial())
843 addFlag(Arg, dwarf::DW_AT_artificial);
848 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DISubroutineType *CTy) {
849 // Add return type. A void return won't have a type.
850 auto Elements = cast<DISubroutineType>(CTy)->getTypeArray();
852 if (auto RTy = Elements[0])
853 addType(Buffer, RTy);
855 bool isPrototyped = true;
856 if (Elements.size() == 2 && !Elements[1])
857 isPrototyped = false;
859 constructSubprogramArguments(Buffer, Elements);
861 // Add prototype flag if we're dealing with a C language and the function has
863 uint16_t Language = getLanguage();
865 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
866 Language == dwarf::DW_LANG_ObjC))
867 addFlag(Buffer, dwarf::DW_AT_prototyped);
869 // Add a DW_AT_calling_convention if this has an explicit convention.
870 if (CTy->getCC() && CTy->getCC() != dwarf::DW_CC_normal)
871 addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
874 if (CTy->isLValueReference())
875 addFlag(Buffer, dwarf::DW_AT_reference);
877 if (CTy->isRValueReference())
878 addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
881 void DwarfUnit::constructTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
882 // Add name if not anonymous or intermediate type.
883 StringRef Name = CTy->getName();
885 uint64_t Size = CTy->getSizeInBits() >> 3;
886 uint16_t Tag = Buffer.getTag();
889 case dwarf::DW_TAG_array_type:
890 constructArrayTypeDIE(Buffer, CTy);
892 case dwarf::DW_TAG_enumeration_type:
893 constructEnumTypeDIE(Buffer, CTy);
895 case dwarf::DW_TAG_variant_part:
896 case dwarf::DW_TAG_structure_type:
897 case dwarf::DW_TAG_union_type:
898 case dwarf::DW_TAG_class_type: {
899 // Emit the discriminator for a variant part.
900 DIDerivedType *Discriminator = nullptr;
901 if (Tag == dwarf::DW_TAG_variant_part) {
902 Discriminator = CTy->getDiscriminator();
905 // If the variant part has a discriminant, the discriminant is
906 // represented by a separate debugging information entry which is
907 // a child of the variant part entry.
908 DIE &DiscMember = constructMemberDIE(Buffer, Discriminator);
909 addDIEEntry(Buffer, dwarf::DW_AT_discr, DiscMember);
913 // Add elements to structure type.
914 DINodeArray Elements = CTy->getElements();
915 for (const auto *Element : Elements) {
918 if (auto *SP = dyn_cast<DISubprogram>(Element))
919 getOrCreateSubprogramDIE(SP);
920 else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
921 if (DDTy->getTag() == dwarf::DW_TAG_friend) {
922 DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
923 addType(ElemDie, DDTy->getBaseType(), dwarf::DW_AT_friend);
924 } else if (DDTy->isStaticMember()) {
925 getOrCreateStaticMemberDIE(DDTy);
926 } else if (Tag == dwarf::DW_TAG_variant_part) {
927 // When emitting a variant part, wrap each member in
929 DIE &Variant = createAndAddDIE(dwarf::DW_TAG_variant, Buffer);
930 if (const ConstantInt *CI =
931 dyn_cast_or_null<ConstantInt>(DDTy->getDiscriminantValue())) {
932 if (isUnsignedDIType(DD, Discriminator->getBaseType()))
933 addUInt(Variant, dwarf::DW_AT_discr_value, None, CI->getZExtValue());
935 addSInt(Variant, dwarf::DW_AT_discr_value, None, CI->getSExtValue());
937 constructMemberDIE(Variant, DDTy);
939 constructMemberDIE(Buffer, DDTy);
941 } else if (auto *Property = dyn_cast<DIObjCProperty>(Element)) {
942 DIE &ElemDie = createAndAddDIE(Property->getTag(), Buffer);
943 StringRef PropertyName = Property->getName();
944 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
945 if (Property->getType())
946 addType(ElemDie, Property->getType());
947 addSourceLine(ElemDie, Property);
948 StringRef GetterName = Property->getGetterName();
949 if (!GetterName.empty())
950 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
951 StringRef SetterName = Property->getSetterName();
952 if (!SetterName.empty())
953 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
954 if (unsigned PropertyAttributes = Property->getAttributes())
955 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
957 } else if (auto *Composite = dyn_cast<DICompositeType>(Element)) {
958 if (Composite->getTag() == dwarf::DW_TAG_variant_part) {
959 DIE &VariantPart = createAndAddDIE(Composite->getTag(), Buffer);
960 constructTypeDIE(VariantPart, Composite);
965 if (CTy->isAppleBlockExtension())
966 addFlag(Buffer, dwarf::DW_AT_APPLE_block);
968 if (CTy->getExportSymbols())
969 addFlag(Buffer, dwarf::DW_AT_export_symbols);
971 // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
972 // inside C++ composite types to point to the base class with the vtable.
973 // Rust uses DW_AT_containing_type to link a vtable to the type
974 // for which it was created.
975 if (auto *ContainingType = CTy->getVTableHolder())
976 addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
977 *getOrCreateTypeDIE(ContainingType));
979 if (CTy->isObjcClassComplete())
980 addFlag(Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
982 // Add template parameters to a class, structure or union types.
983 // FIXME: The support isn't in the metadata for this yet.
984 if (Tag == dwarf::DW_TAG_class_type ||
985 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
986 addTemplateParams(Buffer, CTy->getTemplateParams());
988 // Add the type's non-standard calling convention.
990 if (CTy->isTypePassByValue())
991 CC = dwarf::DW_CC_pass_by_value;
992 else if (CTy->isTypePassByReference())
993 CC = dwarf::DW_CC_pass_by_reference;
995 addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
1003 // Add name if not anonymous or intermediate type.
1005 addString(Buffer, dwarf::DW_AT_name, Name);
1007 if (Tag == dwarf::DW_TAG_enumeration_type ||
1008 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
1009 Tag == dwarf::DW_TAG_union_type) {
1010 // Add size if non-zero (derived types might be zero-sized.)
1011 // TODO: Do we care about size for enum forward declarations?
1013 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
1014 else if (!CTy->isForwardDecl())
1015 // Add zero size if it is not a forward declaration.
1016 addUInt(Buffer, dwarf::DW_AT_byte_size, None, 0);
1018 // If we're a forward decl, say so.
1019 if (CTy->isForwardDecl())
1020 addFlag(Buffer, dwarf::DW_AT_declaration);
1022 // Add source line info if available.
1023 if (!CTy->isForwardDecl())
1024 addSourceLine(Buffer, CTy);
1026 // No harm in adding the runtime language to the declaration.
1027 unsigned RLang = CTy->getRuntimeLang();
1029 addUInt(Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
1032 // Add align info if available.
1033 if (uint32_t AlignInBytes = CTy->getAlignInBytes())
1034 addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1039 void DwarfUnit::constructTemplateTypeParameterDIE(
1040 DIE &Buffer, const DITemplateTypeParameter *TP) {
1042 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
1043 // Add the type if it exists, it could be void and therefore no type.
1045 addType(ParamDIE, TP->getType());
1046 if (!TP->getName().empty())
1047 addString(ParamDIE, dwarf::DW_AT_name, TP->getName());
1048 if (TP->isDefault() && (DD->getDwarfVersion() >= 5))
1049 addFlag(ParamDIE, dwarf::DW_AT_default_value);
1052 void DwarfUnit::constructTemplateValueParameterDIE(
1053 DIE &Buffer, const DITemplateValueParameter *VP) {
1054 DIE &ParamDIE = createAndAddDIE(VP->getTag(), Buffer);
1056 // Add the type if there is one, template template and template parameter
1057 // packs will not have a type.
1058 if (VP->getTag() == dwarf::DW_TAG_template_value_parameter)
1059 addType(ParamDIE, VP->getType());
1060 if (!VP->getName().empty())
1061 addString(ParamDIE, dwarf::DW_AT_name, VP->getName());
1062 if (VP->isDefault() && (DD->getDwarfVersion() >= 5))
1063 addFlag(ParamDIE, dwarf::DW_AT_default_value);
1064 if (Metadata *Val = VP->getValue()) {
1065 if (ConstantInt *CI = mdconst::dyn_extract<ConstantInt>(Val))
1066 addConstantValue(ParamDIE, CI, VP->getType());
1067 else if (GlobalValue *GV = mdconst::dyn_extract<GlobalValue>(Val)) {
1068 // We cannot describe the location of dllimport'd entities: the
1069 // computation of their address requires loads from the IAT.
1070 if (!GV->hasDLLImportStorageClass()) {
1071 // For declaration non-type template parameters (such as global values
1073 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1074 addOpAddress(*Loc, Asm->getSymbol(GV));
1075 // Emit DW_OP_stack_value to use the address as the immediate value of
1076 // the parameter, rather than a pointer to it.
1077 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1078 addBlock(ParamDIE, dwarf::DW_AT_location, Loc);
1080 } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1081 assert(isa<MDString>(Val));
1082 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1083 cast<MDString>(Val)->getString());
1084 } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1085 addTemplateParams(ParamDIE, cast<MDTuple>(Val));
1090 DIE *DwarfUnit::getOrCreateNameSpace(const DINamespace *NS) {
1091 // Construct the context before querying for the existence of the DIE in case
1092 // such construction creates the DIE.
1093 DIE *ContextDIE = getOrCreateContextDIE(NS->getScope());
1095 if (DIE *NDie = getDIE(NS))
1097 DIE &NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1099 StringRef Name = NS->getName();
1101 addString(NDie, dwarf::DW_AT_name, NS->getName());
1103 Name = "(anonymous namespace)";
1104 DD->addAccelNamespace(*CUNode, Name, NDie);
1105 addGlobalName(Name, NDie, NS->getScope());
1106 if (NS->getExportSymbols())
1107 addFlag(NDie, dwarf::DW_AT_export_symbols);
1111 DIE *DwarfUnit::getOrCreateModule(const DIModule *M) {
1112 // Construct the context before querying for the existence of the DIE in case
1113 // such construction creates the DIE.
1114 DIE *ContextDIE = getOrCreateContextDIE(M->getScope());
1116 if (DIE *MDie = getDIE(M))
1118 DIE &MDie = createAndAddDIE(dwarf::DW_TAG_module, *ContextDIE, M);
1120 if (!M->getName().empty()) {
1121 addString(MDie, dwarf::DW_AT_name, M->getName());
1122 addGlobalName(M->getName(), MDie, M->getScope());
1124 if (!M->getConfigurationMacros().empty())
1125 addString(MDie, dwarf::DW_AT_LLVM_config_macros,
1126 M->getConfigurationMacros());
1127 if (!M->getIncludePath().empty())
1128 addString(MDie, dwarf::DW_AT_LLVM_include_path, M->getIncludePath());
1129 if (!M->getAPINotesFile().empty())
1130 addString(MDie, dwarf::DW_AT_LLVM_apinotes, M->getAPINotesFile());
1132 addUInt(MDie, dwarf::DW_AT_decl_file, None,
1133 getOrCreateSourceID(M->getFile()));
1135 addUInt(MDie, dwarf::DW_AT_decl_line, None, M->getLineNo());
1140 DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal) {
1141 // Construct the context before querying for the existence of the DIE in case
1142 // such construction creates the DIE (as is the case for member function
1145 Minimal ? &getUnitDie() : getOrCreateContextDIE(SP->getScope());
1147 if (DIE *SPDie = getDIE(SP))
1150 if (auto *SPDecl = SP->getDeclaration()) {
1152 // Add subprogram definitions to the CU die directly.
1153 ContextDIE = &getUnitDie();
1154 // Build the decl now to ensure it precedes the definition.
1155 getOrCreateSubprogramDIE(SPDecl);
1159 // DW_TAG_inlined_subroutine may refer to this DIE.
1160 DIE &SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1162 // Stop here and fill this in later, depending on whether or not this
1163 // subprogram turns out to have inlined instances or not.
1164 if (SP->isDefinition())
1167 static_cast<DwarfUnit *>(SPDie.getUnit())
1168 ->applySubprogramAttributes(SP, SPDie);
1172 bool DwarfUnit::applySubprogramDefinitionAttributes(const DISubprogram *SP,
1174 DIE *DeclDie = nullptr;
1175 StringRef DeclLinkageName;
1176 if (auto *SPDecl = SP->getDeclaration()) {
1177 DITypeRefArray DeclArgs, DefinitionArgs;
1178 DeclArgs = SPDecl->getType()->getTypeArray();
1179 DefinitionArgs = SP->getType()->getTypeArray();
1181 if (DeclArgs.size() && DefinitionArgs.size())
1182 if (DefinitionArgs[0] != NULL && DeclArgs[0] != DefinitionArgs[0])
1183 addType(SPDie, DefinitionArgs[0]);
1185 DeclDie = getDIE(SPDecl);
1186 assert(DeclDie && "This DIE should've already been constructed when the "
1187 "definition DIE was created in "
1188 "getOrCreateSubprogramDIE");
1189 // Look at the Decl's linkage name only if we emitted it.
1190 if (DD->useAllLinkageNames())
1191 DeclLinkageName = SPDecl->getLinkageName();
1192 unsigned DeclID = getOrCreateSourceID(SPDecl->getFile());
1193 unsigned DefID = getOrCreateSourceID(SP->getFile());
1194 if (DeclID != DefID)
1195 addUInt(SPDie, dwarf::DW_AT_decl_file, None, DefID);
1197 if (SP->getLine() != SPDecl->getLine())
1198 addUInt(SPDie, dwarf::DW_AT_decl_line, None, SP->getLine());
1201 // Add function template parameters.
1202 addTemplateParams(SPDie, SP->getTemplateParams());
1204 // Add the linkage name if we have one and it isn't in the Decl.
1205 StringRef LinkageName = SP->getLinkageName();
1206 assert(((LinkageName.empty() || DeclLinkageName.empty()) ||
1207 LinkageName == DeclLinkageName) &&
1208 "decl has a linkage name and it is different");
1209 if (DeclLinkageName.empty() &&
1210 // Always emit it for abstract subprograms.
1211 (DD->useAllLinkageNames() || DU->getAbstractSPDies().lookup(SP)))
1212 addLinkageName(SPDie, LinkageName);
1217 // Refer to the function declaration where all the other attributes will be
1219 addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie);
1223 void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
1224 bool SkipSPAttributes) {
1225 // If -fdebug-info-for-profiling is enabled, need to emit the subprogram
1226 // and its source location.
1227 bool SkipSPSourceLocation = SkipSPAttributes &&
1228 !CUNode->getDebugInfoForProfiling();
1229 if (!SkipSPSourceLocation)
1230 if (applySubprogramDefinitionAttributes(SP, SPDie))
1233 // Constructors and operators for anonymous aggregates do not have names.
1234 if (!SP->getName().empty())
1235 addString(SPDie, dwarf::DW_AT_name, SP->getName());
1237 if (!SkipSPSourceLocation)
1238 addSourceLine(SPDie, SP);
1240 // Skip the rest of the attributes under -gmlt to save space.
1241 if (SkipSPAttributes)
1244 // Add the prototype if we have a prototype and we have a C like
1246 uint16_t Language = getLanguage();
1247 if (SP->isPrototyped() &&
1248 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1249 Language == dwarf::DW_LANG_ObjC))
1250 addFlag(SPDie, dwarf::DW_AT_prototyped);
1252 if (SP->isObjCDirect())
1253 addFlag(SPDie, dwarf::DW_AT_APPLE_objc_direct);
1256 DITypeRefArray Args;
1257 if (const DISubroutineType *SPTy = SP->getType()) {
1258 Args = SPTy->getTypeArray();
1262 // Add a DW_AT_calling_convention if this has an explicit convention.
1263 if (CC && CC != dwarf::DW_CC_normal)
1264 addUInt(SPDie, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1, CC);
1266 // Add a return type. If this is a type like a C/C++ void type we don't add a
1269 if (auto Ty = Args[0])
1272 unsigned VK = SP->getVirtuality();
1274 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1275 if (SP->getVirtualIndex() != -1u) {
1276 DIELoc *Block = getDIELoc();
1277 addUInt(*Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1278 addUInt(*Block, dwarf::DW_FORM_udata, SP->getVirtualIndex());
1279 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1281 ContainingTypeMap.insert(std::make_pair(&SPDie, SP->getContainingType()));
1284 if (!SP->isDefinition()) {
1285 addFlag(SPDie, dwarf::DW_AT_declaration);
1287 // Add arguments. Do not add arguments for subprogram definition. They will
1288 // be handled while processing variables.
1289 constructSubprogramArguments(SPDie, Args);
1292 addThrownTypes(SPDie, SP->getThrownTypes());
1294 if (SP->isArtificial())
1295 addFlag(SPDie, dwarf::DW_AT_artificial);
1297 if (!SP->isLocalToUnit())
1298 addFlag(SPDie, dwarf::DW_AT_external);
1300 if (DD->useAppleExtensionAttributes()) {
1301 if (SP->isOptimized())
1302 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1304 if (unsigned isa = Asm->getISAEncoding())
1305 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1308 if (SP->isLValueReference())
1309 addFlag(SPDie, dwarf::DW_AT_reference);
1311 if (SP->isRValueReference())
1312 addFlag(SPDie, dwarf::DW_AT_rvalue_reference);
1314 if (SP->isNoReturn())
1315 addFlag(SPDie, dwarf::DW_AT_noreturn);
1317 if (SP->isProtected())
1318 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1319 dwarf::DW_ACCESS_protected);
1320 else if (SP->isPrivate())
1321 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1322 dwarf::DW_ACCESS_private);
1323 else if (SP->isPublic())
1324 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1325 dwarf::DW_ACCESS_public);
1327 if (SP->isExplicit())
1328 addFlag(SPDie, dwarf::DW_AT_explicit);
1330 if (SP->isMainSubprogram())
1331 addFlag(SPDie, dwarf::DW_AT_main_subprogram);
1333 addFlag(SPDie, dwarf::DW_AT_pure);
1334 if (SP->isElemental())
1335 addFlag(SPDie, dwarf::DW_AT_elemental);
1336 if (SP->isRecursive())
1337 addFlag(SPDie, dwarf::DW_AT_recursive);
1339 if (DD->getDwarfVersion() >= 5 && SP->isDeleted())
1340 addFlag(SPDie, dwarf::DW_AT_deleted);
1343 void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,
1345 DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1346 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);
1348 // The LowerBound value defines the lower bounds which is typically zero for
1349 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1350 // Count == -1 then the array is unbounded and we do not emit
1351 // DW_AT_lower_bound and DW_AT_count attributes.
1352 int64_t DefaultLowerBound = getDefaultLowerBound();
1354 if (auto *CI = SR->getCount().dyn_cast<ConstantInt*>())
1355 Count = CI->getSExtValue();
1357 auto addBoundTypeEntry = [&](dwarf::Attribute Attr,
1358 DISubrange::BoundType Bound) -> void {
1359 if (auto *BV = Bound.dyn_cast<DIVariable *>()) {
1360 if (auto *VarDIE = getDIE(BV))
1361 addDIEEntry(DW_Subrange, Attr, *VarDIE);
1362 } else if (auto *BE = Bound.dyn_cast<DIExpression *>()) {
1363 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1364 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1365 DwarfExpr.setMemoryLocationKind();
1366 DwarfExpr.addExpression(BE);
1367 addBlock(DW_Subrange, Attr, DwarfExpr.finalize());
1368 } else if (auto *BI = Bound.dyn_cast<ConstantInt *>()) {
1369 if (Attr != dwarf::DW_AT_lower_bound || DefaultLowerBound == -1 ||
1370 BI->getSExtValue() != DefaultLowerBound)
1371 addSInt(DW_Subrange, Attr, dwarf::DW_FORM_sdata, BI->getSExtValue());
1375 addBoundTypeEntry(dwarf::DW_AT_lower_bound, SR->getLowerBound());
1377 if (auto *CV = SR->getCount().dyn_cast<DIVariable*>()) {
1378 if (auto *CountVarDIE = getDIE(CV))
1379 addDIEEntry(DW_Subrange, dwarf::DW_AT_count, *CountVarDIE);
1380 } else if (Count != -1)
1381 addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count);
1383 addBoundTypeEntry(dwarf::DW_AT_upper_bound, SR->getUpperBound());
1385 addBoundTypeEntry(dwarf::DW_AT_byte_stride, SR->getStride());
1388 DIE *DwarfUnit::getIndexTyDie() {
1391 // Construct an integer type to use for indexes.
1392 IndexTyDie = &createAndAddDIE(dwarf::DW_TAG_base_type, getUnitDie());
1393 StringRef Name = "__ARRAY_SIZE_TYPE__";
1394 addString(*IndexTyDie, dwarf::DW_AT_name, Name);
1395 addUInt(*IndexTyDie, dwarf::DW_AT_byte_size, None, sizeof(int64_t));
1396 addUInt(*IndexTyDie, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1397 dwarf::DW_ATE_unsigned);
1398 DD->addAccelType(*CUNode, Name, *IndexTyDie, /*Flags*/ 0);
1402 /// Returns true if the vector's size differs from the sum of sizes of elements
1403 /// the user specified. This can occur if the vector has been rounded up to
1404 /// fit memory alignment constraints.
1405 static bool hasVectorBeenPadded(const DICompositeType *CTy) {
1406 assert(CTy && CTy->isVector() && "Composite type is not a vector");
1407 const uint64_t ActualSize = CTy->getSizeInBits();
1409 // Obtain the size of each element in the vector.
1410 DIType *BaseTy = CTy->getBaseType();
1411 assert(BaseTy && "Unknown vector element type.");
1412 const uint64_t ElementSize = BaseTy->getSizeInBits();
1414 // Locate the number of elements in the vector.
1415 const DINodeArray Elements = CTy->getElements();
1416 assert(Elements.size() == 1 &&
1417 Elements[0]->getTag() == dwarf::DW_TAG_subrange_type &&
1418 "Invalid vector element array, expected one element of type subrange");
1419 const auto Subrange = cast<DISubrange>(Elements[0]);
1420 const auto NumVecElements =
1421 Subrange->getCount()
1422 ? Subrange->getCount().get<ConstantInt *>()->getSExtValue()
1425 // Ensure we found the element count and that the actual size is wide
1426 // enough to contain the requested size.
1427 assert(ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size");
1428 return ActualSize != (NumVecElements * ElementSize);
1431 void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1432 if (CTy->isVector()) {
1433 addFlag(Buffer, dwarf::DW_AT_GNU_vector);
1434 if (hasVectorBeenPadded(CTy))
1435 addUInt(Buffer, dwarf::DW_AT_byte_size, None,
1436 CTy->getSizeInBits() / CHAR_BIT);
1439 if (DIVariable *Var = CTy->getDataLocation()) {
1440 if (auto *VarDIE = getDIE(Var))
1441 addDIEEntry(Buffer, dwarf::DW_AT_data_location, *VarDIE);
1442 } else if (DIExpression *Expr = CTy->getDataLocationExp()) {
1443 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1444 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1445 DwarfExpr.setMemoryLocationKind();
1446 DwarfExpr.addExpression(Expr);
1447 addBlock(Buffer, dwarf::DW_AT_data_location, DwarfExpr.finalize());
1450 // Emit the element type.
1451 addType(Buffer, CTy->getBaseType());
1453 // Get an anonymous type for index type.
1454 // FIXME: This type should be passed down from the front end
1455 // as different languages may have different sizes for indexes.
1456 DIE *IdxTy = getIndexTyDie();
1458 // Add subranges to array type.
1459 DINodeArray Elements = CTy->getElements();
1460 for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1461 // FIXME: Should this really be such a loose cast?
1462 if (auto *Element = dyn_cast_or_null<DINode>(Elements[i]))
1463 if (Element->getTag() == dwarf::DW_TAG_subrange_type)
1464 constructSubrangeDIE(Buffer, cast<DISubrange>(Element), IdxTy);
1468 void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1469 const DIType *DTy = CTy->getBaseType();
1470 bool IsUnsigned = DTy && isUnsignedDIType(DD, DTy);
1472 if (DD->getDwarfVersion() >= 3)
1473 addType(Buffer, DTy);
1474 if (DD->getDwarfVersion() >= 4 && (CTy->getFlags() & DINode::FlagEnumClass))
1475 addFlag(Buffer, dwarf::DW_AT_enum_class);
1478 auto *Context = CTy->getScope();
1479 bool IndexEnumerators = !Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
1480 isa<DINamespace>(Context) || isa<DICommonBlock>(Context);
1481 DINodeArray Elements = CTy->getElements();
1483 // Add enumerators to enumeration type.
1484 for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1485 auto *Enum = dyn_cast_or_null<DIEnumerator>(Elements[i]);
1487 DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1488 StringRef Name = Enum->getName();
1489 addString(Enumerator, dwarf::DW_AT_name, Name);
1490 addConstantValue(Enumerator, Enum->getValue(), IsUnsigned);
1491 if (IndexEnumerators)
1492 addGlobalName(Name, Enumerator, Context);
1497 void DwarfUnit::constructContainingTypeDIEs() {
1498 for (auto CI = ContainingTypeMap.begin(), CE = ContainingTypeMap.end();
1500 DIE &SPDie = *CI->first;
1501 const DINode *D = CI->second;
1504 DIE *NDie = getDIE(D);
1507 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, *NDie);
1511 DIE &DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
1512 DIE &MemberDie = createAndAddDIE(DT->getTag(), Buffer);
1513 StringRef Name = DT->getName();
1515 addString(MemberDie, dwarf::DW_AT_name, Name);
1517 if (DIType *Resolved = DT->getBaseType())
1518 addType(MemberDie, Resolved);
1520 addSourceLine(MemberDie, DT);
1522 if (DT->getTag() == dwarf::DW_TAG_inheritance && DT->isVirtual()) {
1524 // For C++, virtual base classes are not at fixed offset. Use following
1525 // expression to extract appropriate offset from vtable.
1526 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1528 DIELoc *VBaseLocationDie = new (DIEValueAllocator) DIELoc;
1529 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1530 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1531 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1532 addUInt(*VBaseLocationDie, dwarf::DW_FORM_udata, DT->getOffsetInBits());
1533 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1534 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1535 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1537 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1539 uint64_t Size = DT->getSizeInBits();
1540 uint64_t FieldSize = DD->getBaseTypeSize(DT);
1541 uint32_t AlignInBytes = DT->getAlignInBytes();
1542 uint64_t OffsetInBytes;
1544 bool IsBitfield = FieldSize && Size != FieldSize;
1546 // Handle bitfield, assume bytes are 8 bits.
1547 if (DD->useDWARF2Bitfields())
1548 addUInt(MemberDie, dwarf::DW_AT_byte_size, None, FieldSize/8);
1549 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, Size);
1551 uint64_t Offset = DT->getOffsetInBits();
1552 // We can't use DT->getAlignInBits() here: AlignInBits for member type
1553 // is non-zero if and only if alignment was forced (e.g. _Alignas()),
1554 // which can't be done with bitfields. Thus we use FieldSize here.
1555 uint32_t AlignInBits = FieldSize;
1556 uint32_t AlignMask = ~(AlignInBits - 1);
1557 // The bits from the start of the storage unit to the start of the field.
1558 uint64_t StartBitOffset = Offset - (Offset & AlignMask);
1559 // The byte offset of the field's aligned storage unit inside the struct.
1560 OffsetInBytes = (Offset - StartBitOffset) / 8;
1562 if (DD->useDWARF2Bitfields()) {
1563 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1564 uint64_t FieldOffset = (HiMark - FieldSize);
1565 Offset -= FieldOffset;
1567 // Maybe we need to work from the other end.
1568 if (Asm->getDataLayout().isLittleEndian())
1569 Offset = FieldSize - (Offset + Size);
1571 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1572 OffsetInBytes = FieldOffset >> 3;
1574 addUInt(MemberDie, dwarf::DW_AT_data_bit_offset, None, Offset);
1577 // This is not a bitfield.
1578 OffsetInBytes = DT->getOffsetInBits() / 8;
1580 addUInt(MemberDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1584 if (DD->getDwarfVersion() <= 2) {
1585 DIELoc *MemLocationDie = new (DIEValueAllocator) DIELoc;
1586 addUInt(*MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1587 addUInt(*MemLocationDie, dwarf::DW_FORM_udata, OffsetInBytes);
1588 addBlock(MemberDie, dwarf::DW_AT_data_member_location, MemLocationDie);
1589 } else if (!IsBitfield || DD->useDWARF2Bitfields())
1590 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None,
1594 if (DT->isProtected())
1595 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1596 dwarf::DW_ACCESS_protected);
1597 else if (DT->isPrivate())
1598 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1599 dwarf::DW_ACCESS_private);
1600 // Otherwise C++ member and base classes are considered public.
1601 else if (DT->isPublic())
1602 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1603 dwarf::DW_ACCESS_public);
1604 if (DT->isVirtual())
1605 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1606 dwarf::DW_VIRTUALITY_virtual);
1608 // Objective-C properties.
1609 if (DINode *PNode = DT->getObjCProperty())
1610 if (DIE *PDie = getDIE(PNode))
1611 MemberDie.addValue(DIEValueAllocator, dwarf::DW_AT_APPLE_property,
1612 dwarf::DW_FORM_ref4, DIEEntry(*PDie));
1614 if (DT->isArtificial())
1615 addFlag(MemberDie, dwarf::DW_AT_artificial);
1620 DIE *DwarfUnit::getOrCreateStaticMemberDIE(const DIDerivedType *DT) {
1624 // Construct the context before querying for the existence of the DIE in case
1625 // such construction creates the DIE.
1626 DIE *ContextDIE = getOrCreateContextDIE(DT->getScope());
1627 assert(dwarf::isType(ContextDIE->getTag()) &&
1628 "Static member should belong to a type.");
1630 if (DIE *StaticMemberDIE = getDIE(DT))
1631 return StaticMemberDIE;
1633 DIE &StaticMemberDIE = createAndAddDIE(DT->getTag(), *ContextDIE, DT);
1635 const DIType *Ty = DT->getBaseType();
1637 addString(StaticMemberDIE, dwarf::DW_AT_name, DT->getName());
1638 addType(StaticMemberDIE, Ty);
1639 addSourceLine(StaticMemberDIE, DT);
1640 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1641 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1643 // FIXME: We could omit private if the parent is a class_type, and
1644 // public if the parent is something else.
1645 if (DT->isProtected())
1646 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1647 dwarf::DW_ACCESS_protected);
1648 else if (DT->isPrivate())
1649 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1650 dwarf::DW_ACCESS_private);
1651 else if (DT->isPublic())
1652 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1653 dwarf::DW_ACCESS_public);
1655 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT->getConstant()))
1656 addConstantValue(StaticMemberDIE, CI, Ty);
1657 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT->getConstant()))
1658 addConstantFPValue(StaticMemberDIE, CFP);
1660 if (uint32_t AlignInBytes = DT->getAlignInBytes())
1661 addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1664 return &StaticMemberDIE;
1667 void DwarfUnit::emitCommonHeader(bool UseOffsets, dwarf::UnitType UT) {
1668 // Emit size of content not including length itself
1669 Asm->OutStreamer->AddComment("Length of Unit");
1670 if (!DD->useSectionsAsReferences()) {
1671 StringRef Prefix = isDwoUnit() ? "debug_info_dwo_" : "debug_info_";
1672 MCSymbol *BeginLabel = Asm->createTempSymbol(Prefix + "start");
1673 EndLabel = Asm->createTempSymbol(Prefix + "end");
1674 Asm->emitLabelDifference(EndLabel, BeginLabel, 4);
1675 Asm->OutStreamer->emitLabel(BeginLabel);
1677 Asm->emitInt32(getHeaderSize() + getUnitDie().getSize());
1679 Asm->OutStreamer->AddComment("DWARF version number");
1680 unsigned Version = DD->getDwarfVersion();
1681 Asm->emitInt16(Version);
1683 // DWARF v5 reorders the address size and adds a unit type.
1685 Asm->OutStreamer->AddComment("DWARF Unit Type");
1687 Asm->OutStreamer->AddComment("Address Size (in bytes)");
1688 Asm->emitInt8(Asm->MAI->getCodePointerSize());
1691 // We share one abbreviations table across all units so it's always at the
1692 // start of the section. Use a relocatable offset where needed to ensure
1693 // linking doesn't invalidate that offset.
1694 Asm->OutStreamer->AddComment("Offset Into Abbrev. Section");
1695 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1699 Asm->emitDwarfSymbolReference(
1700 TLOF.getDwarfAbbrevSection()->getBeginSymbol(), false);
1703 Asm->OutStreamer->AddComment("Address Size (in bytes)");
1704 Asm->emitInt8(Asm->MAI->getCodePointerSize());
1708 void DwarfTypeUnit::emitHeader(bool UseOffsets) {
1709 DwarfUnit::emitCommonHeader(UseOffsets,
1710 DD->useSplitDwarf() ? dwarf::DW_UT_split_type
1711 : dwarf::DW_UT_type);
1712 Asm->OutStreamer->AddComment("Type Signature");
1713 Asm->OutStreamer->emitIntValue(TypeSignature, sizeof(TypeSignature));
1714 Asm->OutStreamer->AddComment("Type DIE Offset");
1715 // In a skeleton type unit there is no type DIE so emit a zero offset.
1716 Asm->OutStreamer->emitIntValue(Ty ? Ty->getOffset() : 0,
1717 sizeof(Ty->getOffset()));
1721 DwarfUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
1722 const MCSymbol *Hi, const MCSymbol *Lo) {
1723 return Die.addValue(DIEValueAllocator, Attribute,
1724 DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1725 : dwarf::DW_FORM_data4,
1726 new (DIEValueAllocator) DIEDelta(Hi, Lo));
1730 DwarfUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
1731 const MCSymbol *Label, const MCSymbol *Sec) {
1732 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
1733 return addLabel(Die, Attribute,
1734 DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
1735 : dwarf::DW_FORM_data4,
1737 return addSectionDelta(Die, Attribute, Label, Sec);
1740 bool DwarfTypeUnit::isDwoUnit() const {
1741 // Since there are no skeleton type units, all type units are dwo type units
1742 // when split DWARF is being used.
1743 return DD->useSplitDwarf();
1746 void DwarfTypeUnit::addGlobalName(StringRef Name, const DIE &Die,
1747 const DIScope *Context) {
1748 getCU().addGlobalNameForTypeUnit(Name, Context);
1751 void DwarfTypeUnit::addGlobalType(const DIType *Ty, const DIE &Die,
1752 const DIScope *Context) {
1753 getCU().addGlobalTypeUnitType(Ty, Context);
1756 const MCSymbol *DwarfUnit::getCrossSectionRelativeBaseAddress() const {
1757 if (!Asm->MAI->doesDwarfUseRelocationsAcrossSections())
1761 return getSection()->getBeginSymbol();
1764 void DwarfUnit::addStringOffsetsStart() {
1765 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1766 addSectionLabel(getUnitDie(), dwarf::DW_AT_str_offsets_base,
1767 DU->getStringOffsetsStartSym(),
1768 TLOF.getDwarfStrOffSection()->getBeginSymbol());
1771 void DwarfUnit::addRnglistsBase() {
1772 assert(DD->getDwarfVersion() >= 5 &&
1773 "DW_AT_rnglists_base requires DWARF version 5 or later");
1774 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1775 addSectionLabel(getUnitDie(), dwarf::DW_AT_rnglists_base,
1776 DU->getRnglistsTableBaseSym(),
1777 TLOF.getDwarfRnglistsSection()->getBeginSymbol());
1780 void DwarfTypeUnit::finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) {
1781 addFlag(D, dwarf::DW_AT_declaration);
1782 StringRef Name = CTy->getName();
1784 addString(D, dwarf::DW_AT_name, Name);
1785 getCU().createTypeDIE(CTy);