1 //===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Data structures for DWARF info entries.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/CodeGen/DIE.h"
15 #include "DwarfCompileUnit.h"
16 #include "DwarfDebug.h"
17 #include "DwarfUnit.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/CodeGen/AsmPrinter.h"
20 #include "llvm/IR/DataLayout.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCStreamer.h"
24 #include "llvm/MC/MCSymbol.h"
25 #include "llvm/Support/Debug.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/Format.h"
28 #include "llvm/Support/FormattedStream.h"
29 #include "llvm/Support/LEB128.h"
30 #include "llvm/Support/MD5.h"
31 #include "llvm/Support/raw_ostream.h"
32 using namespace llvm;
33 
34 #define DEBUG_TYPE "dwarfdebug"
35 
36 //===----------------------------------------------------------------------===//
37 // DIEAbbrevData Implementation
38 //===----------------------------------------------------------------------===//
39 
40 /// Profile - Used to gather unique data for the abbreviation folding set.
41 ///
42 void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
43   // Explicitly cast to an integer type for which FoldingSetNodeID has
44   // overloads.  Otherwise MSVC 2010 thinks this call is ambiguous.
45   ID.AddInteger(unsigned(Attribute));
46   ID.AddInteger(unsigned(Form));
47   if (Form == dwarf::DW_FORM_implicit_const)
48     ID.AddInteger(Value);
49 }
50 
51 //===----------------------------------------------------------------------===//
52 // DIEAbbrev Implementation
53 //===----------------------------------------------------------------------===//
54 
55 /// Profile - Used to gather unique data for the abbreviation folding set.
56 ///
57 void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
58   ID.AddInteger(unsigned(Tag));
59   ID.AddInteger(unsigned(Children));
60 
61   // For each attribute description.
62   for (unsigned i = 0, N = Data.size(); i < N; ++i)
63     Data[i].Profile(ID);
64 }
65 
66 /// Emit - Print the abbreviation using the specified asm printer.
67 ///
68 void DIEAbbrev::Emit(const AsmPrinter *AP) const {
69   // Emit its Dwarf tag type.
70   AP->EmitULEB128(Tag, dwarf::TagString(Tag).data());
71 
72   // Emit whether it has children DIEs.
73   AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children).data());
74 
75   // For each attribute description.
76   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
77     const DIEAbbrevData &AttrData = Data[i];
78 
79     // Emit attribute type.
80     AP->EmitULEB128(AttrData.getAttribute(),
81                     dwarf::AttributeString(AttrData.getAttribute()).data());
82 
83     // Emit form type.
84 #ifndef NDEBUG
85     // Could be an assertion, but this way we can see the failing form code
86     // easily, which helps track down where it came from.
87     if (!dwarf::isValidFormForVersion(AttrData.getForm(),
88                                       AP->getDwarfVersion())) {
89       DEBUG(dbgs() << "Invalid form " << format("0x%x", AttrData.getForm())
90                    << " for DWARF version " << AP->getDwarfVersion() << "\n");
91       llvm_unreachable("Invalid form for specified DWARF version");
92     }
93 #endif
94     AP->EmitULEB128(AttrData.getForm(),
95                     dwarf::FormEncodingString(AttrData.getForm()).data());
96 
97     // Emit value for DW_FORM_implicit_const.
98     if (AttrData.getForm() == dwarf::DW_FORM_implicit_const)
99       AP->EmitSLEB128(AttrData.getValue());
100   }
101 
102   // Mark end of abbreviation.
103   AP->EmitULEB128(0, "EOM(1)");
104   AP->EmitULEB128(0, "EOM(2)");
105 }
106 
107 LLVM_DUMP_METHOD
108 void DIEAbbrev::print(raw_ostream &O) {
109   O << "Abbreviation @"
110     << format("0x%lx", (long)(intptr_t)this)
111     << "  "
112     << dwarf::TagString(Tag)
113     << " "
114     << dwarf::ChildrenString(Children)
115     << '\n';
116 
117   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
118     O << "  "
119       << dwarf::AttributeString(Data[i].getAttribute())
120       << "  "
121       << dwarf::FormEncodingString(Data[i].getForm());
122 
123     if (Data[i].getForm() == dwarf::DW_FORM_implicit_const)
124       O << " " << Data[i].getValue();
125 
126     O << '\n';
127   }
128 }
129 
130 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
131 LLVM_DUMP_METHOD void DIEAbbrev::dump() {
132   print(dbgs());
133 }
134 #endif
135 
136 //===----------------------------------------------------------------------===//
137 // DIEAbbrevSet Implementation
138 //===----------------------------------------------------------------------===//
139 
140 DIEAbbrevSet::~DIEAbbrevSet() {
141   for (DIEAbbrev *Abbrev : Abbreviations)
142     Abbrev->~DIEAbbrev();
143 }
144 
145 DIEAbbrev &DIEAbbrevSet::uniqueAbbreviation(DIE &Die) {
146 
147   FoldingSetNodeID ID;
148   DIEAbbrev Abbrev = Die.generateAbbrev();
149   Abbrev.Profile(ID);
150 
151   void *InsertPos;
152   if (DIEAbbrev *Existing =
153           AbbreviationsSet.FindNodeOrInsertPos(ID, InsertPos)) {
154     Die.setAbbrevNumber(Existing->getNumber());
155     return *Existing;
156   }
157 
158   // Move the abbreviation to the heap and assign a number.
159   DIEAbbrev *New = new (Alloc) DIEAbbrev(std::move(Abbrev));
160   Abbreviations.push_back(New);
161   New->setNumber(Abbreviations.size());
162   Die.setAbbrevNumber(Abbreviations.size());
163 
164   // Store it for lookup.
165   AbbreviationsSet.InsertNode(New, InsertPos);
166   return *New;
167 }
168 
169 void DIEAbbrevSet::Emit(const AsmPrinter *AP, MCSection *Section) const {
170   if (!Abbreviations.empty()) {
171     // Start the debug abbrev section.
172     AP->OutStreamer->SwitchSection(Section);
173     AP->emitDwarfAbbrevs(Abbreviations);
174   }
175 }
176 
177 //===----------------------------------------------------------------------===//
178 // DIE Implementation
179 //===----------------------------------------------------------------------===//
180 
181 DIE *DIE::getParent() const {
182   return Owner.dyn_cast<DIE*>();
183 }
184 
185 DIEAbbrev DIE::generateAbbrev() const {
186   DIEAbbrev Abbrev(Tag, hasChildren());
187   for (const DIEValue &V : values())
188     if (V.getForm() == dwarf::DW_FORM_implicit_const)
189       Abbrev.AddImplicitConstAttribute(V.getAttribute(),
190                                        V.getDIEInteger().getValue());
191     else
192       Abbrev.AddAttribute(V.getAttribute(), V.getForm());
193   return Abbrev;
194 }
195 
196 unsigned DIE::getDebugSectionOffset() const {
197   const DIEUnit *Unit = getUnit();
198   assert(Unit && "DIE must be owned by a DIEUnit to get its absolute offset");
199   return Unit->getDebugSectionOffset() + getOffset();
200 }
201 
202 const DIE *DIE::getUnitDie() const {
203   const DIE *p = this;
204   while (p) {
205     if (p->getTag() == dwarf::DW_TAG_compile_unit ||
206         p->getTag() == dwarf::DW_TAG_type_unit)
207       return p;
208     p = p->getParent();
209   }
210   return nullptr;
211 }
212 
213 const DIEUnit *DIE::getUnit() const {
214   const DIE *UnitDie = getUnitDie();
215   if (UnitDie)
216     return UnitDie->Owner.dyn_cast<DIEUnit*>();
217   return nullptr;
218 }
219 
220 DIEValue DIE::findAttribute(dwarf::Attribute Attribute) const {
221   // Iterate through all the attributes until we find the one we're
222   // looking for, if we can't find it return NULL.
223   for (const auto &V : values())
224     if (V.getAttribute() == Attribute)
225       return V;
226   return DIEValue();
227 }
228 
229 LLVM_DUMP_METHOD
230 static void printValues(raw_ostream &O, const DIEValueList &Values,
231                         StringRef Type, unsigned Size, unsigned IndentCount) {
232   O << Type << ": Size: " << Size << "\n";
233 
234   unsigned I = 0;
235   const std::string Indent(IndentCount, ' ');
236   for (const auto &V : Values.values()) {
237     O << Indent;
238     O << "Blk[" << I++ << "]";
239     O << "  " << dwarf::FormEncodingString(V.getForm()) << " ";
240     V.print(O);
241     O << "\n";
242   }
243 }
244 
245 LLVM_DUMP_METHOD
246 void DIE::print(raw_ostream &O, unsigned IndentCount) const {
247   const std::string Indent(IndentCount, ' ');
248   O << Indent << "Die: " << format("0x%lx", (long)(intptr_t) this)
249     << ", Offset: " << Offset << ", Size: " << Size << "\n";
250 
251   O << Indent << dwarf::TagString(getTag()) << " "
252     << dwarf::ChildrenString(hasChildren()) << "\n";
253 
254   IndentCount += 2;
255   for (const auto &V : values()) {
256     O << Indent;
257     O << dwarf::AttributeString(V.getAttribute());
258     O << "  " << dwarf::FormEncodingString(V.getForm()) << " ";
259     V.print(O);
260     O << "\n";
261   }
262   IndentCount -= 2;
263 
264   for (const auto &Child : children())
265     Child.print(O, IndentCount + 4);
266 
267   O << "\n";
268 }
269 
270 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
271 LLVM_DUMP_METHOD void DIE::dump() {
272   print(dbgs());
273 }
274 #endif
275 
276 unsigned DIE::computeOffsetsAndAbbrevs(const AsmPrinter *AP,
277                                        DIEAbbrevSet &AbbrevSet,
278                                        unsigned CUOffset) {
279   // Unique the abbreviation and fill in the abbreviation number so this DIE
280   // can be emitted.
281   const DIEAbbrev &Abbrev = AbbrevSet.uniqueAbbreviation(*this);
282 
283   // Set compile/type unit relative offset of this DIE.
284   setOffset(CUOffset);
285 
286   // Add the byte size of the abbreviation code.
287   CUOffset += getULEB128Size(getAbbrevNumber());
288 
289   // Add the byte size of all the DIE attribute values.
290   for (const auto &V : values())
291     CUOffset += V.SizeOf(AP);
292 
293   // Let the children compute their offsets and abbreviation numbers.
294   if (hasChildren()) {
295     (void)Abbrev;
296     assert(Abbrev.hasChildren() && "Children flag not set");
297 
298     for (auto &Child : children())
299       CUOffset = Child.computeOffsetsAndAbbrevs(AP, AbbrevSet, CUOffset);
300 
301     // Each child chain is terminated with a zero byte, adjust the offset.
302     CUOffset += sizeof(int8_t);
303   }
304 
305   // Compute the byte size of this DIE and all of its children correctly. This
306   // is needed so that top level DIE can help the compile unit set its length
307   // correctly.
308   setSize(CUOffset - getOffset());
309   return CUOffset;
310 }
311 
312 //===----------------------------------------------------------------------===//
313 // DIEUnit Implementation
314 //===----------------------------------------------------------------------===//
315 DIEUnit::DIEUnit(uint16_t V, uint8_t A, dwarf::Tag UnitTag)
316     : Die(UnitTag), Section(nullptr), Offset(0), Length(0), Version(V),
317       AddrSize(A)
318 {
319   Die.Owner = this;
320   assert((UnitTag == dwarf::DW_TAG_compile_unit ||
321           UnitTag == dwarf::DW_TAG_type_unit ||
322           UnitTag == dwarf::DW_TAG_partial_unit) && "expected a unit TAG");
323 }
324 
325 void DIEValue::EmitValue(const AsmPrinter *AP) const {
326   switch (Ty) {
327   case isNone:
328     llvm_unreachable("Expected valid DIEValue");
329 #define HANDLE_DIEVALUE(T)                                                     \
330   case is##T:                                                                  \
331     getDIE##T().EmitValue(AP, Form);                                           \
332     break;
333 #include "llvm/CodeGen/DIEValue.def"
334   }
335 }
336 
337 unsigned DIEValue::SizeOf(const AsmPrinter *AP) const {
338   switch (Ty) {
339   case isNone:
340     llvm_unreachable("Expected valid DIEValue");
341 #define HANDLE_DIEVALUE(T)                                                     \
342   case is##T:                                                                  \
343     return getDIE##T().SizeOf(AP, Form);
344 #include "llvm/CodeGen/DIEValue.def"
345   }
346   llvm_unreachable("Unknown DIE kind");
347 }
348 
349 LLVM_DUMP_METHOD
350 void DIEValue::print(raw_ostream &O) const {
351   switch (Ty) {
352   case isNone:
353     llvm_unreachable("Expected valid DIEValue");
354 #define HANDLE_DIEVALUE(T)                                                     \
355   case is##T:                                                                  \
356     getDIE##T().print(O);                                                      \
357     break;
358 #include "llvm/CodeGen/DIEValue.def"
359   }
360 }
361 
362 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
363 LLVM_DUMP_METHOD void DIEValue::dump() const {
364   print(dbgs());
365 }
366 #endif
367 
368 //===----------------------------------------------------------------------===//
369 // DIEInteger Implementation
370 //===----------------------------------------------------------------------===//
371 
372 /// EmitValue - Emit integer of appropriate size.
373 ///
374 void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
375   switch (Form) {
376   case dwarf::DW_FORM_implicit_const:
377   case dwarf::DW_FORM_flag_present:
378     // Emit something to keep the lines and comments in sync.
379     // FIXME: Is there a better way to do this?
380     Asm->OutStreamer->AddBlankLine();
381     return;
382   case dwarf::DW_FORM_flag:
383   case dwarf::DW_FORM_ref1:
384   case dwarf::DW_FORM_data1:
385   case dwarf::DW_FORM_strx1:
386   case dwarf::DW_FORM_addrx1:
387   case dwarf::DW_FORM_ref2:
388   case dwarf::DW_FORM_data2:
389   case dwarf::DW_FORM_strx2:
390   case dwarf::DW_FORM_addrx2:
391   case dwarf::DW_FORM_strp:
392   case dwarf::DW_FORM_ref4:
393   case dwarf::DW_FORM_data4:
394   case dwarf::DW_FORM_ref_sup4:
395   case dwarf::DW_FORM_strx4:
396   case dwarf::DW_FORM_addrx4:
397   case dwarf::DW_FORM_ref8:
398   case dwarf::DW_FORM_ref_sig8:
399   case dwarf::DW_FORM_data8:
400   case dwarf::DW_FORM_ref_sup8:
401   case dwarf::DW_FORM_GNU_ref_alt:
402   case dwarf::DW_FORM_GNU_strp_alt:
403   case dwarf::DW_FORM_line_strp:
404   case dwarf::DW_FORM_sec_offset:
405   case dwarf::DW_FORM_strp_sup:
406   case dwarf::DW_FORM_addr:
407   case dwarf::DW_FORM_ref_addr:
408     Asm->OutStreamer->EmitIntValue(Integer, SizeOf(Asm, Form));
409     return;
410   case dwarf::DW_FORM_GNU_str_index:
411   case dwarf::DW_FORM_GNU_addr_index:
412   case dwarf::DW_FORM_ref_udata:
413   case dwarf::DW_FORM_udata:
414     Asm->EmitULEB128(Integer);
415     return;
416   case dwarf::DW_FORM_sdata:
417     Asm->EmitSLEB128(Integer);
418     return;
419   default: llvm_unreachable("DIE Value form not supported yet");
420   }
421 }
422 
423 /// SizeOf - Determine size of integer value in bytes.
424 ///
425 unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
426   switch (Form) {
427   case dwarf::DW_FORM_implicit_const:
428   case dwarf::DW_FORM_flag_present:
429     return 0;
430   case dwarf::DW_FORM_flag:
431   case dwarf::DW_FORM_ref1:
432   case dwarf::DW_FORM_data1:
433   case dwarf::DW_FORM_strx1:
434   case dwarf::DW_FORM_addrx1:
435     return sizeof(int8_t);
436   case dwarf::DW_FORM_ref2:
437   case dwarf::DW_FORM_data2:
438   case dwarf::DW_FORM_strx2:
439   case dwarf::DW_FORM_addrx2:
440     return sizeof(int16_t);
441   case dwarf::DW_FORM_ref4:
442   case dwarf::DW_FORM_data4:
443   case dwarf::DW_FORM_ref_sup4:
444   case dwarf::DW_FORM_strx4:
445   case dwarf::DW_FORM_addrx4:
446     return sizeof(int32_t);
447   case dwarf::DW_FORM_ref8:
448   case dwarf::DW_FORM_ref_sig8:
449   case dwarf::DW_FORM_data8:
450   case dwarf::DW_FORM_ref_sup8:
451     return sizeof(int64_t);
452   case dwarf::DW_FORM_ref_addr:
453     if (AP->getDwarfVersion() == 2)
454       return AP->getPointerSize();
455     LLVM_FALLTHROUGH;
456   case dwarf::DW_FORM_strp:
457   case dwarf::DW_FORM_GNU_ref_alt:
458   case dwarf::DW_FORM_GNU_strp_alt:
459   case dwarf::DW_FORM_line_strp:
460   case dwarf::DW_FORM_sec_offset:
461   case dwarf::DW_FORM_strp_sup:
462     switch (AP->OutStreamer->getContext().getDwarfFormat()) {
463     case dwarf::DWARF32:
464       return 4;
465     case dwarf::DWARF64:
466       return 8;
467     }
468     llvm_unreachable("Invalid DWARF format");
469   case dwarf::DW_FORM_GNU_str_index:
470   case dwarf::DW_FORM_GNU_addr_index:
471   case dwarf::DW_FORM_ref_udata:
472   case dwarf::DW_FORM_udata:
473     return getULEB128Size(Integer);
474   case dwarf::DW_FORM_sdata:
475     return getSLEB128Size(Integer);
476   case dwarf::DW_FORM_addr:
477     return AP->getPointerSize();
478   default: llvm_unreachable("DIE Value form not supported yet");
479   }
480 }
481 
482 LLVM_DUMP_METHOD
483 void DIEInteger::print(raw_ostream &O) const {
484   O << "Int: " << (int64_t)Integer << "  0x";
485   O.write_hex(Integer);
486 }
487 
488 //===----------------------------------------------------------------------===//
489 // DIEExpr Implementation
490 //===----------------------------------------------------------------------===//
491 
492 /// EmitValue - Emit expression value.
493 ///
494 void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
495   AP->EmitDebugThreadLocal(Expr, SizeOf(AP, Form));
496 }
497 
498 /// SizeOf - Determine size of expression value in bytes.
499 ///
500 unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
501   if (Form == dwarf::DW_FORM_data4) return 4;
502   if (Form == dwarf::DW_FORM_sec_offset) return 4;
503   if (Form == dwarf::DW_FORM_strp) return 4;
504   return AP->getPointerSize();
505 }
506 
507 LLVM_DUMP_METHOD
508 void DIEExpr::print(raw_ostream &O) const { O << "Expr: " << *Expr; }
509 
510 //===----------------------------------------------------------------------===//
511 // DIELabel Implementation
512 //===----------------------------------------------------------------------===//
513 
514 /// EmitValue - Emit label value.
515 ///
516 void DIELabel::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
517   AP->EmitLabelReference(Label, SizeOf(AP, Form),
518                          Form == dwarf::DW_FORM_strp ||
519                              Form == dwarf::DW_FORM_sec_offset ||
520                              Form == dwarf::DW_FORM_ref_addr ||
521                              Form == dwarf::DW_FORM_data4);
522 }
523 
524 /// SizeOf - Determine size of label value in bytes.
525 ///
526 unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
527   if (Form == dwarf::DW_FORM_data4) return 4;
528   if (Form == dwarf::DW_FORM_sec_offset) return 4;
529   if (Form == dwarf::DW_FORM_strp) return 4;
530   return AP->MAI->getCodePointerSize();
531 }
532 
533 LLVM_DUMP_METHOD
534 void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
535 
536 //===----------------------------------------------------------------------===//
537 // DIEDelta Implementation
538 //===----------------------------------------------------------------------===//
539 
540 /// EmitValue - Emit delta value.
541 ///
542 void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
543   AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
544 }
545 
546 /// SizeOf - Determine size of delta value in bytes.
547 ///
548 unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
549   if (Form == dwarf::DW_FORM_data4) return 4;
550   if (Form == dwarf::DW_FORM_sec_offset) return 4;
551   if (Form == dwarf::DW_FORM_strp) return 4;
552   return AP->MAI->getCodePointerSize();
553 }
554 
555 LLVM_DUMP_METHOD
556 void DIEDelta::print(raw_ostream &O) const {
557   O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
558 }
559 
560 //===----------------------------------------------------------------------===//
561 // DIEString Implementation
562 //===----------------------------------------------------------------------===//
563 
564 /// EmitValue - Emit string value.
565 ///
566 void DIEString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
567   assert(
568       (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
569       "Expected valid string form");
570 
571   // Index of string in symbol table.
572   if (Form == dwarf::DW_FORM_GNU_str_index) {
573     DIEInteger(S.getIndex()).EmitValue(AP, Form);
574     return;
575   }
576 
577   // Relocatable symbol.
578   assert(Form == dwarf::DW_FORM_strp);
579   if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
580     DIELabel(S.getSymbol()).EmitValue(AP, Form);
581     return;
582   }
583 
584   // Offset into symbol table.
585   DIEInteger(S.getOffset()).EmitValue(AP, Form);
586 }
587 
588 /// SizeOf - Determine size of delta value in bytes.
589 ///
590 unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
591   assert(
592       (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
593       "Expected valid string form");
594 
595   // Index of string in symbol table.
596   if (Form == dwarf::DW_FORM_GNU_str_index)
597     return DIEInteger(S.getIndex()).SizeOf(AP, Form);
598 
599   // Relocatable symbol.
600   if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
601     return DIELabel(S.getSymbol()).SizeOf(AP, Form);
602 
603   // Offset into symbol table.
604   return DIEInteger(S.getOffset()).SizeOf(AP, Form);
605 }
606 
607 LLVM_DUMP_METHOD
608 void DIEString::print(raw_ostream &O) const {
609   O << "String: " << S.getString();
610 }
611 
612 //===----------------------------------------------------------------------===//
613 // DIEInlineString Implementation
614 //===----------------------------------------------------------------------===//
615 void DIEInlineString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
616   if (Form == dwarf::DW_FORM_string) {
617     for (char ch : S)
618       AP->EmitInt8(ch);
619     AP->EmitInt8(0);
620     return;
621   }
622   llvm_unreachable("Expected valid string form");
623 }
624 
625 unsigned DIEInlineString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
626   // Emit string bytes + NULL byte.
627   return S.size() + 1;
628 }
629 
630 LLVM_DUMP_METHOD
631 void DIEInlineString::print(raw_ostream &O) const {
632   O << "InlineString: " << S;
633 }
634 
635 //===----------------------------------------------------------------------===//
636 // DIEEntry Implementation
637 //===----------------------------------------------------------------------===//
638 
639 /// EmitValue - Emit debug information entry offset.
640 ///
641 void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
642 
643   switch (Form) {
644   case dwarf::DW_FORM_ref1:
645   case dwarf::DW_FORM_ref2:
646   case dwarf::DW_FORM_ref4:
647   case dwarf::DW_FORM_ref8:
648     AP->OutStreamer->EmitIntValue(Entry->getOffset(), SizeOf(AP, Form));
649     return;
650 
651   case dwarf::DW_FORM_ref_udata:
652     AP->EmitULEB128(Entry->getOffset());
653     return;
654 
655   case dwarf::DW_FORM_ref_addr: {
656     // Get the absolute offset for this DIE within the debug info/types section.
657     unsigned Addr = Entry->getDebugSectionOffset();
658     if (const MCSymbol *SectionSym =
659             Entry->getUnit()->getCrossSectionRelativeBaseAddress()) {
660       AP->EmitLabelPlusOffset(SectionSym, Addr, SizeOf(AP, Form), true);
661       return;
662     }
663 
664     AP->OutStreamer->EmitIntValue(Addr, SizeOf(AP, Form));
665     return;
666   }
667   default:
668     llvm_unreachable("Improper form for DIE reference");
669   }
670 }
671 
672 unsigned DIEEntry::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
673   switch (Form) {
674   case dwarf::DW_FORM_ref1:
675     return 1;
676   case dwarf::DW_FORM_ref2:
677     return 2;
678   case dwarf::DW_FORM_ref4:
679     return 4;
680   case dwarf::DW_FORM_ref8:
681     return 8;
682   case dwarf::DW_FORM_ref_udata:
683     return getULEB128Size(Entry->getOffset());
684   case dwarf::DW_FORM_ref_addr:
685     if (AP->getDwarfVersion() == 2)
686       return AP->MAI->getCodePointerSize();
687     switch (AP->OutStreamer->getContext().getDwarfFormat()) {
688     case dwarf::DWARF32:
689       return 4;
690     case dwarf::DWARF64:
691       return 8;
692     }
693     llvm_unreachable("Invalid DWARF format");
694 
695   default:
696     llvm_unreachable("Improper form for DIE reference");
697   }
698 }
699 
700 LLVM_DUMP_METHOD
701 void DIEEntry::print(raw_ostream &O) const {
702   O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
703 }
704 
705 //===----------------------------------------------------------------------===//
706 // DIELoc Implementation
707 //===----------------------------------------------------------------------===//
708 
709 /// ComputeSize - calculate the size of the location expression.
710 ///
711 unsigned DIELoc::ComputeSize(const AsmPrinter *AP) const {
712   if (!Size) {
713     for (const auto &V : values())
714       Size += V.SizeOf(AP);
715   }
716 
717   return Size;
718 }
719 
720 /// EmitValue - Emit location data.
721 ///
722 void DIELoc::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
723   switch (Form) {
724   default: llvm_unreachable("Improper form for block");
725   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
726   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
727   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
728   case dwarf::DW_FORM_block:
729   case dwarf::DW_FORM_exprloc:
730     Asm->EmitULEB128(Size); break;
731   }
732 
733   for (const auto &V : values())
734     V.EmitValue(Asm);
735 }
736 
737 /// SizeOf - Determine size of location data in bytes.
738 ///
739 unsigned DIELoc::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
740   switch (Form) {
741   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
742   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
743   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
744   case dwarf::DW_FORM_block:
745   case dwarf::DW_FORM_exprloc:
746     return Size + getULEB128Size(Size);
747   default: llvm_unreachable("Improper form for block");
748   }
749 }
750 
751 LLVM_DUMP_METHOD
752 void DIELoc::print(raw_ostream &O) const {
753   printValues(O, *this, "ExprLoc", Size, 5);
754 }
755 
756 //===----------------------------------------------------------------------===//
757 // DIEBlock Implementation
758 //===----------------------------------------------------------------------===//
759 
760 /// ComputeSize - calculate the size of the block.
761 ///
762 unsigned DIEBlock::ComputeSize(const AsmPrinter *AP) const {
763   if (!Size) {
764     for (const auto &V : values())
765       Size += V.SizeOf(AP);
766   }
767 
768   return Size;
769 }
770 
771 /// EmitValue - Emit block data.
772 ///
773 void DIEBlock::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
774   switch (Form) {
775   default: llvm_unreachable("Improper form for block");
776   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
777   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
778   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
779   case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
780   }
781 
782   for (const auto &V : values())
783     V.EmitValue(Asm);
784 }
785 
786 /// SizeOf - Determine size of block data in bytes.
787 ///
788 unsigned DIEBlock::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
789   switch (Form) {
790   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
791   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
792   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
793   case dwarf::DW_FORM_block:  return Size + getULEB128Size(Size);
794   default: llvm_unreachable("Improper form for block");
795   }
796 }
797 
798 LLVM_DUMP_METHOD
799 void DIEBlock::print(raw_ostream &O) const {
800   printValues(O, *this, "Blk", Size, 5);
801 }
802 
803 //===----------------------------------------------------------------------===//
804 // DIELocList Implementation
805 //===----------------------------------------------------------------------===//
806 
807 unsigned DIELocList::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
808   if (Form == dwarf::DW_FORM_data4)
809     return 4;
810   if (Form == dwarf::DW_FORM_sec_offset)
811     return 4;
812   return AP->MAI->getCodePointerSize();
813 }
814 
815 /// EmitValue - Emit label value.
816 ///
817 void DIELocList::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
818   DwarfDebug *DD = AP->getDwarfDebug();
819   MCSymbol *Label = DD->getDebugLocs().getList(Index).Label;
820   AP->emitDwarfSymbolReference(Label, /*ForceOffset*/ DD->useSplitDwarf());
821 }
822 
823 LLVM_DUMP_METHOD
824 void DIELocList::print(raw_ostream &O) const { O << "LocList: " << Index; }
825