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 //===----------------------------------------------------------------------===//
35 // DIEAbbrevData Implementation
36 //===----------------------------------------------------------------------===//
37 
38 /// Profile - Used to gather unique data for the abbreviation folding set.
39 ///
40 void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
41   // Explicitly cast to an integer type for which FoldingSetNodeID has
42   // overloads.  Otherwise MSVC 2010 thinks this call is ambiguous.
43   ID.AddInteger(unsigned(Attribute));
44   ID.AddInteger(unsigned(Form));
45 }
46 
47 //===----------------------------------------------------------------------===//
48 // DIEAbbrev Implementation
49 //===----------------------------------------------------------------------===//
50 
51 /// Profile - Used to gather unique data for the abbreviation folding set.
52 ///
53 void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
54   ID.AddInteger(unsigned(Tag));
55   ID.AddInteger(unsigned(Children));
56 
57   // For each attribute description.
58   for (unsigned i = 0, N = Data.size(); i < N; ++i)
59     Data[i].Profile(ID);
60 }
61 
62 /// Emit - Print the abbreviation using the specified asm printer.
63 ///
64 void DIEAbbrev::Emit(const AsmPrinter *AP) const {
65   // Emit its Dwarf tag type.
66   AP->EmitULEB128(Tag, dwarf::TagString(Tag).data());
67 
68   // Emit whether it has children DIEs.
69   AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children).data());
70 
71   // For each attribute description.
72   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
73     const DIEAbbrevData &AttrData = Data[i];
74 
75     // Emit attribute type.
76     AP->EmitULEB128(AttrData.getAttribute(),
77                     dwarf::AttributeString(AttrData.getAttribute()).data());
78 
79     // Emit form type.
80     AP->EmitULEB128(AttrData.getForm(),
81                     dwarf::FormEncodingString(AttrData.getForm()).data());
82   }
83 
84   // Mark end of abbreviation.
85   AP->EmitULEB128(0, "EOM(1)");
86   AP->EmitULEB128(0, "EOM(2)");
87 }
88 
89 LLVM_DUMP_METHOD
90 void DIEAbbrev::print(raw_ostream &O) {
91   O << "Abbreviation @"
92     << format("0x%lx", (long)(intptr_t)this)
93     << "  "
94     << dwarf::TagString(Tag)
95     << " "
96     << dwarf::ChildrenString(Children)
97     << '\n';
98 
99   for (unsigned i = 0, N = Data.size(); i < N; ++i) {
100     O << "  "
101       << dwarf::AttributeString(Data[i].getAttribute())
102       << "  "
103       << dwarf::FormEncodingString(Data[i].getForm())
104       << '\n';
105   }
106 }
107 
108 LLVM_DUMP_METHOD
109 void DIEAbbrev::dump() { print(dbgs()); }
110 
111 DIE *DIE::getParent() const {
112   return Owner.dyn_cast<DIE*>();
113 }
114 
115 DIEAbbrev DIE::generateAbbrev() const {
116   DIEAbbrev Abbrev(Tag, hasChildren());
117   for (const DIEValue &V : values())
118     Abbrev.AddAttribute(V.getAttribute(), V.getForm());
119   return Abbrev;
120 }
121 
122 unsigned DIE::getDebugSectionOffset() const {
123   const DIEUnit *Unit = getUnit();
124   assert(Unit && "DIE must be owned by a DIEUnit to get its absolute offset");
125   return Unit->getDebugSectionOffset() + getOffset();
126 }
127 
128 const DIE *DIE::getUnitDie() const {
129   const DIE *p = this;
130   while (p) {
131     if (p->getTag() == dwarf::DW_TAG_compile_unit ||
132         p->getTag() == dwarf::DW_TAG_type_unit)
133       return p;
134     p = p->getParent();
135   }
136   return nullptr;
137 }
138 
139 const DIEUnit *DIE::getUnit() const {
140   const DIE *UnitDie = getUnitDie();
141   if (UnitDie)
142     return UnitDie->Owner.dyn_cast<DIEUnit*>();
143   return nullptr;
144 }
145 
146 DIEValue DIE::findAttribute(dwarf::Attribute Attribute) const {
147   // Iterate through all the attributes until we find the one we're
148   // looking for, if we can't find it return NULL.
149   for (const auto &V : values())
150     if (V.getAttribute() == Attribute)
151       return V;
152   return DIEValue();
153 }
154 
155 LLVM_DUMP_METHOD
156 static void printValues(raw_ostream &O, const DIEValueList &Values,
157                         StringRef Type, unsigned Size, unsigned IndentCount) {
158   O << Type << ": Size: " << Size << "\n";
159 
160   unsigned I = 0;
161   const std::string Indent(IndentCount, ' ');
162   for (const auto &V : Values.values()) {
163     O << Indent;
164     O << "Blk[" << I++ << "]";
165     O << "  " << dwarf::FormEncodingString(V.getForm()) << " ";
166     V.print(O);
167     O << "\n";
168   }
169 }
170 
171 LLVM_DUMP_METHOD
172 void DIE::print(raw_ostream &O, unsigned IndentCount) const {
173   const std::string Indent(IndentCount, ' ');
174   O << Indent << "Die: " << format("0x%lx", (long)(intptr_t) this)
175     << ", Offset: " << Offset << ", Size: " << Size << "\n";
176 
177   O << Indent << dwarf::TagString(getTag()) << " "
178     << dwarf::ChildrenString(hasChildren()) << "\n";
179 
180   IndentCount += 2;
181   for (const auto &V : values()) {
182     O << Indent;
183     O << dwarf::AttributeString(V.getAttribute());
184     O << "  " << dwarf::FormEncodingString(V.getForm()) << " ";
185     V.print(O);
186     O << "\n";
187   }
188   IndentCount -= 2;
189 
190   for (const auto &Child : children())
191     Child.print(O, IndentCount + 4);
192 
193   O << "\n";
194 }
195 
196 LLVM_DUMP_METHOD
197 void DIE::dump() {
198   print(dbgs());
199 }
200 
201 DIEUnit::DIEUnit(uint16_t V, uint8_t A, dwarf::Tag UnitTag)
202     : Die(UnitTag), Section(nullptr), Offset(0), Length(0), Version(V),
203       AddrSize(A)
204 {
205   Die.Owner = this;
206   assert((UnitTag == dwarf::DW_TAG_compile_unit ||
207           UnitTag == dwarf::DW_TAG_type_unit ||
208           UnitTag == dwarf::DW_TAG_partial_unit) && "expected a unit TAG");
209 }
210 
211 void DIEValue::EmitValue(const AsmPrinter *AP) const {
212   switch (Ty) {
213   case isNone:
214     llvm_unreachable("Expected valid DIEValue");
215 #define HANDLE_DIEVALUE(T)                                                     \
216   case is##T:                                                                  \
217     getDIE##T().EmitValue(AP, Form);                                           \
218     break;
219 #include "llvm/CodeGen/DIEValue.def"
220   }
221 }
222 
223 unsigned DIEValue::SizeOf(const AsmPrinter *AP) const {
224   switch (Ty) {
225   case isNone:
226     llvm_unreachable("Expected valid DIEValue");
227 #define HANDLE_DIEVALUE(T)                                                     \
228   case is##T:                                                                  \
229     return getDIE##T().SizeOf(AP, Form);
230 #include "llvm/CodeGen/DIEValue.def"
231   }
232   llvm_unreachable("Unknown DIE kind");
233 }
234 
235 LLVM_DUMP_METHOD
236 void DIEValue::print(raw_ostream &O) const {
237   switch (Ty) {
238   case isNone:
239     llvm_unreachable("Expected valid DIEValue");
240 #define HANDLE_DIEVALUE(T)                                                     \
241   case is##T:                                                                  \
242     getDIE##T().print(O);                                                      \
243     break;
244 #include "llvm/CodeGen/DIEValue.def"
245   }
246 }
247 
248 LLVM_DUMP_METHOD
249 void DIEValue::dump() const {
250   print(dbgs());
251 }
252 
253 //===----------------------------------------------------------------------===//
254 // DIEInteger Implementation
255 //===----------------------------------------------------------------------===//
256 
257 /// EmitValue - Emit integer of appropriate size.
258 ///
259 void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
260   unsigned Size = ~0U;
261   switch (Form) {
262   case dwarf::DW_FORM_flag_present:
263     // Emit something to keep the lines and comments in sync.
264     // FIXME: Is there a better way to do this?
265     Asm->OutStreamer->AddBlankLine();
266     return;
267   case dwarf::DW_FORM_flag:  LLVM_FALLTHROUGH;
268   case dwarf::DW_FORM_ref1:  LLVM_FALLTHROUGH;
269   case dwarf::DW_FORM_data1: Size = 1; break;
270   case dwarf::DW_FORM_ref2:  LLVM_FALLTHROUGH;
271   case dwarf::DW_FORM_data2: Size = 2; break;
272   case dwarf::DW_FORM_sec_offset: LLVM_FALLTHROUGH;
273   case dwarf::DW_FORM_strp:  LLVM_FALLTHROUGH;
274   case dwarf::DW_FORM_ref4:  LLVM_FALLTHROUGH;
275   case dwarf::DW_FORM_data4: Size = 4; break;
276   case dwarf::DW_FORM_ref8:  LLVM_FALLTHROUGH;
277   case dwarf::DW_FORM_ref_sig8:  LLVM_FALLTHROUGH;
278   case dwarf::DW_FORM_data8: Size = 8; break;
279   case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
280   case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
281   case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
282   case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
283   case dwarf::DW_FORM_addr:
284     Size = Asm->getPointerSize();
285     break;
286   case dwarf::DW_FORM_ref_addr:
287     Size = SizeOf(Asm, dwarf::DW_FORM_ref_addr);
288     break;
289   default: llvm_unreachable("DIE Value form not supported yet");
290   }
291   Asm->OutStreamer->EmitIntValue(Integer, Size);
292 }
293 
294 /// SizeOf - Determine size of integer value in bytes.
295 ///
296 unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
297   switch (Form) {
298   case dwarf::DW_FORM_flag_present: return 0;
299   case dwarf::DW_FORM_flag:  LLVM_FALLTHROUGH;
300   case dwarf::DW_FORM_ref1:  LLVM_FALLTHROUGH;
301   case dwarf::DW_FORM_data1: return sizeof(int8_t);
302   case dwarf::DW_FORM_ref2:  LLVM_FALLTHROUGH;
303   case dwarf::DW_FORM_data2: return sizeof(int16_t);
304   case dwarf::DW_FORM_sec_offset: LLVM_FALLTHROUGH;
305   case dwarf::DW_FORM_strp:  LLVM_FALLTHROUGH;
306   case dwarf::DW_FORM_ref4:  LLVM_FALLTHROUGH;
307   case dwarf::DW_FORM_data4: return sizeof(int32_t);
308   case dwarf::DW_FORM_ref8:  LLVM_FALLTHROUGH;
309   case dwarf::DW_FORM_ref_sig8:  LLVM_FALLTHROUGH;
310   case dwarf::DW_FORM_data8: return sizeof(int64_t);
311   case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
312   case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
313   case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
314   case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
315   case dwarf::DW_FORM_addr:
316     return AP->getPointerSize();
317   case dwarf::DW_FORM_ref_addr:
318     if (AP->getDwarfVersion() == 2)
319       return AP->getPointerSize();
320     return sizeof(int32_t);
321   default: llvm_unreachable("DIE Value form not supported yet");
322   }
323 }
324 
325 LLVM_DUMP_METHOD
326 void DIEInteger::print(raw_ostream &O) const {
327   O << "Int: " << (int64_t)Integer << "  0x";
328   O.write_hex(Integer);
329 }
330 
331 //===----------------------------------------------------------------------===//
332 // DIEExpr Implementation
333 //===----------------------------------------------------------------------===//
334 
335 /// EmitValue - Emit expression value.
336 ///
337 void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
338   AP->OutStreamer->EmitValue(Expr, SizeOf(AP, Form));
339 }
340 
341 /// SizeOf - Determine size of expression value in bytes.
342 ///
343 unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
344   if (Form == dwarf::DW_FORM_data4) return 4;
345   if (Form == dwarf::DW_FORM_sec_offset) return 4;
346   if (Form == dwarf::DW_FORM_strp) return 4;
347   return AP->getPointerSize();
348 }
349 
350 LLVM_DUMP_METHOD
351 void DIEExpr::print(raw_ostream &O) const { O << "Expr: " << *Expr; }
352 
353 //===----------------------------------------------------------------------===//
354 // DIELabel Implementation
355 //===----------------------------------------------------------------------===//
356 
357 /// EmitValue - Emit label value.
358 ///
359 void DIELabel::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
360   AP->EmitLabelReference(Label, SizeOf(AP, Form),
361                          Form == dwarf::DW_FORM_strp ||
362                              Form == dwarf::DW_FORM_sec_offset ||
363                              Form == dwarf::DW_FORM_ref_addr);
364 }
365 
366 /// SizeOf - Determine size of label value in bytes.
367 ///
368 unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
369   if (Form == dwarf::DW_FORM_data4) return 4;
370   if (Form == dwarf::DW_FORM_sec_offset) return 4;
371   if (Form == dwarf::DW_FORM_strp) return 4;
372   return AP->getPointerSize();
373 }
374 
375 LLVM_DUMP_METHOD
376 void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
377 
378 //===----------------------------------------------------------------------===//
379 // DIEDelta Implementation
380 //===----------------------------------------------------------------------===//
381 
382 /// EmitValue - Emit delta value.
383 ///
384 void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
385   AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
386 }
387 
388 /// SizeOf - Determine size of delta value in bytes.
389 ///
390 unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
391   if (Form == dwarf::DW_FORM_data4) return 4;
392   if (Form == dwarf::DW_FORM_sec_offset) return 4;
393   if (Form == dwarf::DW_FORM_strp) return 4;
394   return AP->getPointerSize();
395 }
396 
397 LLVM_DUMP_METHOD
398 void DIEDelta::print(raw_ostream &O) const {
399   O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
400 }
401 
402 //===----------------------------------------------------------------------===//
403 // DIEString Implementation
404 //===----------------------------------------------------------------------===//
405 
406 /// EmitValue - Emit string value.
407 ///
408 void DIEString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
409   assert(
410       (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
411       "Expected valid string form");
412 
413   // Index of string in symbol table.
414   if (Form == dwarf::DW_FORM_GNU_str_index) {
415     DIEInteger(S.getIndex()).EmitValue(AP, Form);
416     return;
417   }
418 
419   // Relocatable symbol.
420   assert(Form == dwarf::DW_FORM_strp);
421   if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
422     DIELabel(S.getSymbol()).EmitValue(AP, Form);
423     return;
424   }
425 
426   // Offset into symbol table.
427   DIEInteger(S.getOffset()).EmitValue(AP, Form);
428 }
429 
430 /// SizeOf - Determine size of delta value in bytes.
431 ///
432 unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
433   assert(
434       (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
435       "Expected valid string form");
436 
437   // Index of string in symbol table.
438   if (Form == dwarf::DW_FORM_GNU_str_index)
439     return DIEInteger(S.getIndex()).SizeOf(AP, Form);
440 
441   // Relocatable symbol.
442   if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
443     return DIELabel(S.getSymbol()).SizeOf(AP, Form);
444 
445   // Offset into symbol table.
446   return DIEInteger(S.getOffset()).SizeOf(AP, Form);
447 }
448 
449 LLVM_DUMP_METHOD
450 void DIEString::print(raw_ostream &O) const {
451   O << "String: " << S.getString();
452 }
453 
454 //===----------------------------------------------------------------------===//
455 // DIEEntry Implementation
456 //===----------------------------------------------------------------------===//
457 
458 /// EmitValue - Emit debug information entry offset.
459 ///
460 void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
461 
462   if (Form == dwarf::DW_FORM_ref_addr) {
463     // Get the absolute offset for this DIE within the debug info/types section.
464     unsigned Addr = Entry->getDebugSectionOffset();
465     if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
466       const DwarfDebug *DD = AP->getDwarfDebug();
467       if (DD)
468         assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
469       const DIEUnit *Unit = Entry->getUnit();
470       assert(Unit && "CUDie should belong to a CU.");
471       MCSection *Section = Unit->getSection();
472       assert(Section && "Must have a section if we are doing relocations");
473       const MCSymbol *SectionSym = Section->getBeginSymbol();
474       AP->EmitLabelPlusOffset(SectionSym, Addr, DIEEntry::getRefAddrSize(AP));
475     } else
476       AP->OutStreamer->EmitIntValue(Addr, DIEEntry::getRefAddrSize(AP));
477   } else
478     AP->EmitInt32(Entry->getOffset());
479 }
480 
481 unsigned DIEEntry::getRefAddrSize(const AsmPrinter *AP) {
482   // DWARF4: References that use the attribute form DW_FORM_ref_addr are
483   // specified to be four bytes in the DWARF 32-bit format and eight bytes
484   // in the DWARF 64-bit format, while DWARF Version 2 specifies that such
485   // references have the same size as an address on the target system.
486   if (AP->getDwarfVersion() == 2)
487     return AP->getPointerSize();
488   return sizeof(int32_t);
489 }
490 
491 LLVM_DUMP_METHOD
492 void DIEEntry::print(raw_ostream &O) const {
493   O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
494 }
495 
496 //===----------------------------------------------------------------------===//
497 // DIELoc Implementation
498 //===----------------------------------------------------------------------===//
499 
500 /// ComputeSize - calculate the size of the location expression.
501 ///
502 unsigned DIELoc::ComputeSize(const AsmPrinter *AP) const {
503   if (!Size) {
504     for (const auto &V : values())
505       Size += V.SizeOf(AP);
506   }
507 
508   return Size;
509 }
510 
511 /// EmitValue - Emit location data.
512 ///
513 void DIELoc::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
514   switch (Form) {
515   default: llvm_unreachable("Improper form for block");
516   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
517   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
518   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
519   case dwarf::DW_FORM_block:
520   case dwarf::DW_FORM_exprloc:
521     Asm->EmitULEB128(Size); break;
522   }
523 
524   for (const auto &V : values())
525     V.EmitValue(Asm);
526 }
527 
528 /// SizeOf - Determine size of location data in bytes.
529 ///
530 unsigned DIELoc::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
531   switch (Form) {
532   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
533   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
534   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
535   case dwarf::DW_FORM_block:
536   case dwarf::DW_FORM_exprloc:
537     return Size + getULEB128Size(Size);
538   default: llvm_unreachable("Improper form for block");
539   }
540 }
541 
542 LLVM_DUMP_METHOD
543 void DIELoc::print(raw_ostream &O) const {
544   printValues(O, *this, "ExprLoc", Size, 5);
545 }
546 
547 //===----------------------------------------------------------------------===//
548 // DIEBlock Implementation
549 //===----------------------------------------------------------------------===//
550 
551 /// ComputeSize - calculate the size of the block.
552 ///
553 unsigned DIEBlock::ComputeSize(const AsmPrinter *AP) const {
554   if (!Size) {
555     for (const auto &V : values())
556       Size += V.SizeOf(AP);
557   }
558 
559   return Size;
560 }
561 
562 /// EmitValue - Emit block data.
563 ///
564 void DIEBlock::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
565   switch (Form) {
566   default: llvm_unreachable("Improper form for block");
567   case dwarf::DW_FORM_block1: Asm->EmitInt8(Size);    break;
568   case dwarf::DW_FORM_block2: Asm->EmitInt16(Size);   break;
569   case dwarf::DW_FORM_block4: Asm->EmitInt32(Size);   break;
570   case dwarf::DW_FORM_block:  Asm->EmitULEB128(Size); break;
571   }
572 
573   for (const auto &V : values())
574     V.EmitValue(Asm);
575 }
576 
577 /// SizeOf - Determine size of block data in bytes.
578 ///
579 unsigned DIEBlock::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
580   switch (Form) {
581   case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
582   case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
583   case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
584   case dwarf::DW_FORM_block:  return Size + getULEB128Size(Size);
585   default: llvm_unreachable("Improper form for block");
586   }
587 }
588 
589 LLVM_DUMP_METHOD
590 void DIEBlock::print(raw_ostream &O) const {
591   printValues(O, *this, "Blk", Size, 5);
592 }
593 
594 //===----------------------------------------------------------------------===//
595 // DIELocList Implementation
596 //===----------------------------------------------------------------------===//
597 
598 unsigned DIELocList::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
599   if (Form == dwarf::DW_FORM_data4)
600     return 4;
601   if (Form == dwarf::DW_FORM_sec_offset)
602     return 4;
603   return AP->getPointerSize();
604 }
605 
606 /// EmitValue - Emit label value.
607 ///
608 void DIELocList::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
609   DwarfDebug *DD = AP->getDwarfDebug();
610   MCSymbol *Label = DD->getDebugLocs().getList(Index).Label;
611   AP->emitDwarfSymbolReference(Label, /*ForceOffset*/ DD->useSplitDwarf());
612 }
613 
614 LLVM_DUMP_METHOD
615 void DIELocList::print(raw_ostream &O) const { O << "LocList: " << Index; }
616