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 ///
Profile(FoldingSetNodeID & ID) const40 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 ///
Profile(FoldingSetNodeID & ID) const53 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 ///
Emit(const AsmPrinter * AP) const64 void DIEAbbrev::Emit(const AsmPrinter *AP) const {
65 // Emit its Dwarf tag type.
66 AP->EmitULEB128(Tag, dwarf::TagString(Tag));
67
68 // Emit whether it has children DIEs.
69 AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children));
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()));
78
79 // Emit form type.
80 AP->EmitULEB128(AttrData.getForm(),
81 dwarf::FormEncodingString(AttrData.getForm()));
82 }
83
84 // Mark end of abbreviation.
85 AP->EmitULEB128(0, "EOM(1)");
86 AP->EmitULEB128(0, "EOM(2)");
87 }
88
89 #ifndef NDEBUG
print(raw_ostream & O)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 }
dump()107 void DIEAbbrev::dump() { print(dbgs()); }
108 #endif
109
110 /// Climb up the parent chain to get the unit DIE to which this DIE
111 /// belongs.
getUnit() const112 const DIE *DIE::getUnit() const {
113 const DIE *Cu = getUnitOrNull();
114 assert(Cu && "We should not have orphaned DIEs.");
115 return Cu;
116 }
117
118 /// Climb up the parent chain to get the unit DIE this DIE belongs
119 /// to. Return NULL if DIE is not added to an owner yet.
getUnitOrNull() const120 const DIE *DIE::getUnitOrNull() const {
121 const DIE *p = this;
122 while (p) {
123 if (p->getTag() == dwarf::DW_TAG_compile_unit ||
124 p->getTag() == dwarf::DW_TAG_type_unit)
125 return p;
126 p = p->getParent();
127 }
128 return nullptr;
129 }
130
findAttribute(dwarf::Attribute Attribute) const131 DIEValue *DIE::findAttribute(dwarf::Attribute Attribute) const {
132 const SmallVectorImpl<DIEValue *> &Values = getValues();
133 const DIEAbbrev &Abbrevs = getAbbrev();
134
135 // Iterate through all the attributes until we find the one we're
136 // looking for, if we can't find it return NULL.
137 for (size_t i = 0; i < Values.size(); ++i)
138 if (Abbrevs.getData()[i].getAttribute() == Attribute)
139 return Values[i];
140 return nullptr;
141 }
142
143 #ifndef NDEBUG
print(raw_ostream & O,unsigned IndentCount) const144 void DIE::print(raw_ostream &O, unsigned IndentCount) const {
145 const std::string Indent(IndentCount, ' ');
146 bool isBlock = Abbrev.getTag() == 0;
147
148 if (!isBlock) {
149 O << Indent
150 << "Die: "
151 << format("0x%lx", (long)(intptr_t)this)
152 << ", Offset: " << Offset
153 << ", Size: " << Size << "\n";
154
155 O << Indent
156 << dwarf::TagString(Abbrev.getTag())
157 << " "
158 << dwarf::ChildrenString(Abbrev.hasChildren()) << "\n";
159 } else {
160 O << "Size: " << Size << "\n";
161 }
162
163 const SmallVectorImpl<DIEAbbrevData> &Data = Abbrev.getData();
164
165 IndentCount += 2;
166 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
167 O << Indent;
168
169 if (!isBlock)
170 O << dwarf::AttributeString(Data[i].getAttribute());
171 else
172 O << "Blk[" << i << "]";
173
174 O << " "
175 << dwarf::FormEncodingString(Data[i].getForm())
176 << " ";
177 Values[i]->print(O);
178 O << "\n";
179 }
180 IndentCount -= 2;
181
182 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
183 Children[j]->print(O, IndentCount+4);
184 }
185
186 if (!isBlock) O << "\n";
187 }
188
dump()189 void DIE::dump() {
190 print(dbgs());
191 }
192 #endif
193
anchor()194 void DIEValue::anchor() { }
195
196 #ifndef NDEBUG
dump() const197 void DIEValue::dump() const {
198 print(dbgs());
199 }
200 #endif
201
202 //===----------------------------------------------------------------------===//
203 // DIEInteger Implementation
204 //===----------------------------------------------------------------------===//
205
206 /// EmitValue - Emit integer of appropriate size.
207 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const208 void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
209 unsigned Size = ~0U;
210 switch (Form) {
211 case dwarf::DW_FORM_flag_present:
212 // Emit something to keep the lines and comments in sync.
213 // FIXME: Is there a better way to do this?
214 Asm->OutStreamer.AddBlankLine();
215 return;
216 case dwarf::DW_FORM_flag: // Fall thru
217 case dwarf::DW_FORM_ref1: // Fall thru
218 case dwarf::DW_FORM_data1: Size = 1; break;
219 case dwarf::DW_FORM_ref2: // Fall thru
220 case dwarf::DW_FORM_data2: Size = 2; break;
221 case dwarf::DW_FORM_sec_offset: // Fall thru
222 case dwarf::DW_FORM_strp: // Fall thru
223 case dwarf::DW_FORM_ref4: // Fall thru
224 case dwarf::DW_FORM_data4: Size = 4; break;
225 case dwarf::DW_FORM_ref8: // Fall thru
226 case dwarf::DW_FORM_ref_sig8: // Fall thru
227 case dwarf::DW_FORM_data8: Size = 8; break;
228 case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
229 case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
230 case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
231 case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
232 case dwarf::DW_FORM_addr:
233 Size = Asm->getDataLayout().getPointerSize(); break;
234 case dwarf::DW_FORM_ref_addr:
235 Size = SizeOf(Asm, dwarf::DW_FORM_ref_addr);
236 break;
237 default: llvm_unreachable("DIE Value form not supported yet");
238 }
239 Asm->OutStreamer.EmitIntValue(Integer, Size);
240 }
241
242 /// SizeOf - Determine size of integer value in bytes.
243 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const244 unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
245 switch (Form) {
246 case dwarf::DW_FORM_flag_present: return 0;
247 case dwarf::DW_FORM_flag: // Fall thru
248 case dwarf::DW_FORM_ref1: // Fall thru
249 case dwarf::DW_FORM_data1: return sizeof(int8_t);
250 case dwarf::DW_FORM_ref2: // Fall thru
251 case dwarf::DW_FORM_data2: return sizeof(int16_t);
252 case dwarf::DW_FORM_sec_offset: // Fall thru
253 case dwarf::DW_FORM_strp: // Fall thru
254 case dwarf::DW_FORM_ref4: // Fall thru
255 case dwarf::DW_FORM_data4: return sizeof(int32_t);
256 case dwarf::DW_FORM_ref8: // Fall thru
257 case dwarf::DW_FORM_ref_sig8: // Fall thru
258 case dwarf::DW_FORM_data8: return sizeof(int64_t);
259 case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
260 case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
261 case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
262 case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
263 case dwarf::DW_FORM_addr: return AP->getDataLayout().getPointerSize();
264 case dwarf::DW_FORM_ref_addr:
265 if (AP->OutStreamer.getContext().getDwarfVersion() == 2)
266 return AP->getDataLayout().getPointerSize();
267 return sizeof(int32_t);
268 default: llvm_unreachable("DIE Value form not supported yet");
269 }
270 }
271
272 #ifndef NDEBUG
print(raw_ostream & O) const273 void DIEInteger::print(raw_ostream &O) const {
274 O << "Int: " << (int64_t)Integer << " 0x";
275 O.write_hex(Integer);
276 }
277 #endif
278
279 //===----------------------------------------------------------------------===//
280 // DIEExpr Implementation
281 //===----------------------------------------------------------------------===//
282
283 /// EmitValue - Emit expression value.
284 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const285 void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
286 AP->OutStreamer.EmitValue(Expr, SizeOf(AP, Form));
287 }
288
289 /// SizeOf - Determine size of expression value in bytes.
290 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const291 unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
292 if (Form == dwarf::DW_FORM_data4) return 4;
293 if (Form == dwarf::DW_FORM_sec_offset) return 4;
294 if (Form == dwarf::DW_FORM_strp) return 4;
295 return AP->getDataLayout().getPointerSize();
296 }
297
298 #ifndef NDEBUG
print(raw_ostream & O) const299 void DIEExpr::print(raw_ostream &O) const {
300 O << "Expr: ";
301 Expr->print(O);
302 }
303 #endif
304
305 //===----------------------------------------------------------------------===//
306 // DIELabel Implementation
307 //===----------------------------------------------------------------------===//
308
309 /// EmitValue - Emit label value.
310 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const311 void DIELabel::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
312 AP->EmitLabelReference(Label, SizeOf(AP, Form),
313 Form == dwarf::DW_FORM_strp ||
314 Form == dwarf::DW_FORM_sec_offset ||
315 Form == dwarf::DW_FORM_ref_addr);
316 }
317
318 /// SizeOf - Determine size of label value in bytes.
319 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const320 unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
321 if (Form == dwarf::DW_FORM_data4) return 4;
322 if (Form == dwarf::DW_FORM_sec_offset) return 4;
323 if (Form == dwarf::DW_FORM_strp) return 4;
324 return AP->getDataLayout().getPointerSize();
325 }
326
327 #ifndef NDEBUG
print(raw_ostream & O) const328 void DIELabel::print(raw_ostream &O) const {
329 O << "Lbl: " << Label->getName();
330 }
331 #endif
332
333 //===----------------------------------------------------------------------===//
334 // DIEDelta Implementation
335 //===----------------------------------------------------------------------===//
336
337 /// EmitValue - Emit delta value.
338 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const339 void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
340 AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
341 }
342
343 /// SizeOf - Determine size of delta value in bytes.
344 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const345 unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
346 if (Form == dwarf::DW_FORM_data4) return 4;
347 if (Form == dwarf::DW_FORM_sec_offset) return 4;
348 if (Form == dwarf::DW_FORM_strp) return 4;
349 return AP->getDataLayout().getPointerSize();
350 }
351
352 #ifndef NDEBUG
print(raw_ostream & O) const353 void DIEDelta::print(raw_ostream &O) const {
354 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
355 }
356 #endif
357
358 //===----------------------------------------------------------------------===//
359 // DIEString Implementation
360 //===----------------------------------------------------------------------===//
361
362 /// EmitValue - Emit string value.
363 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const364 void DIEString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
365 Access->EmitValue(AP, Form);
366 }
367
368 /// SizeOf - Determine size of delta value in bytes.
369 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const370 unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
371 return Access->SizeOf(AP, Form);
372 }
373
374 #ifndef NDEBUG
print(raw_ostream & O) const375 void DIEString::print(raw_ostream &O) const {
376 O << "String: " << Str << "\tSymbol: ";
377 Access->print(O);
378 }
379 #endif
380
381 //===----------------------------------------------------------------------===//
382 // DIEEntry Implementation
383 //===----------------------------------------------------------------------===//
384
385 /// EmitValue - Emit debug information entry offset.
386 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const387 void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
388
389 if (Form == dwarf::DW_FORM_ref_addr) {
390 const DwarfDebug *DD = AP->getDwarfDebug();
391 unsigned Addr = Entry.getOffset();
392 assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
393 // For DW_FORM_ref_addr, output the offset from beginning of debug info
394 // section. Entry->getOffset() returns the offset from start of the
395 // compile unit.
396 DwarfCompileUnit *CU = DD->lookupUnit(Entry.getUnit());
397 assert(CU && "CUDie should belong to a CU.");
398 Addr += CU->getDebugInfoOffset();
399 if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
400 AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
401 DIEEntry::getRefAddrSize(AP));
402 else
403 AP->OutStreamer.EmitIntValue(Addr, DIEEntry::getRefAddrSize(AP));
404 } else
405 AP->EmitInt32(Entry.getOffset());
406 }
407
getRefAddrSize(const AsmPrinter * AP)408 unsigned DIEEntry::getRefAddrSize(const AsmPrinter *AP) {
409 // DWARF4: References that use the attribute form DW_FORM_ref_addr are
410 // specified to be four bytes in the DWARF 32-bit format and eight bytes
411 // in the DWARF 64-bit format, while DWARF Version 2 specifies that such
412 // references have the same size as an address on the target system.
413 const DwarfDebug *DD = AP->getDwarfDebug();
414 assert(DD && "Expected Dwarf Debug info to be available");
415 if (DD->getDwarfVersion() == 2)
416 return AP->getDataLayout().getPointerSize();
417 return sizeof(int32_t);
418 }
419
420 #ifndef NDEBUG
print(raw_ostream & O) const421 void DIEEntry::print(raw_ostream &O) const {
422 O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
423 }
424 #endif
425
426 //===----------------------------------------------------------------------===//
427 // DIETypeSignature Implementation
428 //===----------------------------------------------------------------------===//
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const429 void DIETypeSignature::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
430 assert(Form == dwarf::DW_FORM_ref_sig8);
431 Asm->OutStreamer.EmitIntValue(Unit.getTypeSignature(), 8);
432 }
433
434 #ifndef NDEBUG
print(raw_ostream & O) const435 void DIETypeSignature::print(raw_ostream &O) const {
436 O << format("Type Unit: 0x%lx", Unit.getTypeSignature());
437 }
438
dump() const439 void DIETypeSignature::dump() const { print(dbgs()); }
440 #endif
441
442 //===----------------------------------------------------------------------===//
443 // DIELoc Implementation
444 //===----------------------------------------------------------------------===//
445
446 /// ComputeSize - calculate the size of the location expression.
447 ///
ComputeSize(const AsmPrinter * AP) const448 unsigned DIELoc::ComputeSize(const AsmPrinter *AP) const {
449 if (!Size) {
450 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
451 for (unsigned i = 0, N = Values.size(); i < N; ++i)
452 Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
453 }
454
455 return Size;
456 }
457
458 /// EmitValue - Emit location data.
459 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const460 void DIELoc::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
461 switch (Form) {
462 default: llvm_unreachable("Improper form for block");
463 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
464 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
465 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
466 case dwarf::DW_FORM_block:
467 case dwarf::DW_FORM_exprloc:
468 Asm->EmitULEB128(Size); break;
469 }
470
471 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
472 for (unsigned i = 0, N = Values.size(); i < N; ++i)
473 Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
474 }
475
476 /// SizeOf - Determine size of location data in bytes.
477 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const478 unsigned DIELoc::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
479 switch (Form) {
480 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
481 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
482 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
483 case dwarf::DW_FORM_block:
484 case dwarf::DW_FORM_exprloc:
485 return Size + getULEB128Size(Size);
486 default: llvm_unreachable("Improper form for block");
487 }
488 }
489
490 #ifndef NDEBUG
print(raw_ostream & O) const491 void DIELoc::print(raw_ostream &O) const {
492 O << "ExprLoc: ";
493 DIE::print(O, 5);
494 }
495 #endif
496
497 //===----------------------------------------------------------------------===//
498 // DIEBlock Implementation
499 //===----------------------------------------------------------------------===//
500
501 /// ComputeSize - calculate the size of the block.
502 ///
ComputeSize(const AsmPrinter * AP) const503 unsigned DIEBlock::ComputeSize(const AsmPrinter *AP) const {
504 if (!Size) {
505 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
506 for (unsigned i = 0, N = Values.size(); i < N; ++i)
507 Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
508 }
509
510 return Size;
511 }
512
513 /// EmitValue - Emit block data.
514 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const515 void DIEBlock::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
516 switch (Form) {
517 default: llvm_unreachable("Improper form for block");
518 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
519 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
520 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
521 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break;
522 }
523
524 const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
525 for (unsigned i = 0, N = Values.size(); i < N; ++i)
526 Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
527 }
528
529 /// SizeOf - Determine size of block data in bytes.
530 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const531 unsigned DIEBlock::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
532 switch (Form) {
533 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
534 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
535 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
536 case dwarf::DW_FORM_block: return Size + getULEB128Size(Size);
537 default: llvm_unreachable("Improper form for block");
538 }
539 }
540
541 #ifndef NDEBUG
print(raw_ostream & O) const542 void DIEBlock::print(raw_ostream &O) const {
543 O << "Blk: ";
544 DIE::print(O, 5);
545 }
546 #endif
547
548 //===----------------------------------------------------------------------===//
549 // DIELocList Implementation
550 //===----------------------------------------------------------------------===//
551
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const552 unsigned DIELocList::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
553 if (Form == dwarf::DW_FORM_data4)
554 return 4;
555 if (Form == dwarf::DW_FORM_sec_offset)
556 return 4;
557 return AP->getDataLayout().getPointerSize();
558 }
559
560 /// EmitValue - Emit label value.
561 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const562 void DIELocList::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
563 DwarfDebug *DD = AP->getDwarfDebug();
564 MCSymbol *Label = DD->getDebugLocEntries()[Index].Label;
565
566 if (AP->MAI->doesDwarfUseRelocationsAcrossSections() && !DD->useSplitDwarf())
567 AP->emitSectionOffset(Label);
568 else
569 AP->EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
570 }
571
572 #ifndef NDEBUG
print(raw_ostream & O) const573 void DIELocList::print(raw_ostream &O) const {
574 O << "LocList: " << Index;
575
576 }
577 #endif
578