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 LLVM_DUMP_METHOD
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 }
107
108 LLVM_DUMP_METHOD
dump()109 void DIEAbbrev::dump() { print(dbgs()); }
110
generateAbbrev() const111 DIEAbbrev DIE::generateAbbrev() const {
112 DIEAbbrev Abbrev(Tag, hasChildren());
113 for (const DIEValue &V : values())
114 Abbrev.AddAttribute(V.getAttribute(), V.getForm());
115 return Abbrev;
116 }
117
118 /// Climb up the parent chain to get the unit DIE to which this DIE
119 /// belongs.
getUnit() const120 const DIE *DIE::getUnit() const {
121 const DIE *Cu = getUnitOrNull();
122 assert(Cu && "We should not have orphaned DIEs.");
123 return Cu;
124 }
125
126 /// Climb up the parent chain to get the unit DIE this DIE belongs
127 /// to. Return NULL if DIE is not added to an owner yet.
getUnitOrNull() const128 const DIE *DIE::getUnitOrNull() 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
findAttribute(dwarf::Attribute Attribute) const139 DIEValue DIE::findAttribute(dwarf::Attribute Attribute) const {
140 // Iterate through all the attributes until we find the one we're
141 // looking for, if we can't find it return NULL.
142 for (const auto &V : values())
143 if (V.getAttribute() == Attribute)
144 return V;
145 return DIEValue();
146 }
147
148 LLVM_DUMP_METHOD
printValues(raw_ostream & O,const DIEValueList & Values,StringRef Type,unsigned Size,unsigned IndentCount)149 static void printValues(raw_ostream &O, const DIEValueList &Values,
150 StringRef Type, unsigned Size, unsigned IndentCount) {
151 O << Type << ": Size: " << Size << "\n";
152
153 unsigned I = 0;
154 const std::string Indent(IndentCount, ' ');
155 for (const auto &V : Values.values()) {
156 O << Indent;
157 O << "Blk[" << I++ << "]";
158 O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
159 V.print(O);
160 O << "\n";
161 }
162 }
163
164 LLVM_DUMP_METHOD
print(raw_ostream & O,unsigned IndentCount) const165 void DIE::print(raw_ostream &O, unsigned IndentCount) const {
166 const std::string Indent(IndentCount, ' ');
167 O << Indent << "Die: " << format("0x%lx", (long)(intptr_t) this)
168 << ", Offset: " << Offset << ", Size: " << Size << "\n";
169
170 O << Indent << dwarf::TagString(getTag()) << " "
171 << dwarf::ChildrenString(hasChildren()) << "\n";
172
173 IndentCount += 2;
174 for (const auto &V : values()) {
175 O << Indent;
176 O << dwarf::AttributeString(V.getAttribute());
177 O << " " << dwarf::FormEncodingString(V.getForm()) << " ";
178 V.print(O);
179 O << "\n";
180 }
181 IndentCount -= 2;
182
183 for (const auto &Child : children())
184 Child.print(O, IndentCount + 4);
185
186 O << "\n";
187 }
188
189 LLVM_DUMP_METHOD
dump()190 void DIE::dump() {
191 print(dbgs());
192 }
193
EmitValue(const AsmPrinter * AP) const194 void DIEValue::EmitValue(const AsmPrinter *AP) const {
195 switch (Ty) {
196 case isNone:
197 llvm_unreachable("Expected valid DIEValue");
198 #define HANDLE_DIEVALUE(T) \
199 case is##T: \
200 getDIE##T().EmitValue(AP, Form); \
201 break;
202 #include "llvm/CodeGen/DIEValue.def"
203 }
204 }
205
SizeOf(const AsmPrinter * AP) const206 unsigned DIEValue::SizeOf(const AsmPrinter *AP) const {
207 switch (Ty) {
208 case isNone:
209 llvm_unreachable("Expected valid DIEValue");
210 #define HANDLE_DIEVALUE(T) \
211 case is##T: \
212 return getDIE##T().SizeOf(AP, Form);
213 #include "llvm/CodeGen/DIEValue.def"
214 }
215 llvm_unreachable("Unknown DIE kind");
216 }
217
218 LLVM_DUMP_METHOD
print(raw_ostream & O) const219 void DIEValue::print(raw_ostream &O) const {
220 switch (Ty) {
221 case isNone:
222 llvm_unreachable("Expected valid DIEValue");
223 #define HANDLE_DIEVALUE(T) \
224 case is##T: \
225 getDIE##T().print(O); \
226 break;
227 #include "llvm/CodeGen/DIEValue.def"
228 }
229 }
230
231 LLVM_DUMP_METHOD
dump() const232 void DIEValue::dump() const {
233 print(dbgs());
234 }
235
236 //===----------------------------------------------------------------------===//
237 // DIEInteger Implementation
238 //===----------------------------------------------------------------------===//
239
240 /// EmitValue - Emit integer of appropriate size.
241 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const242 void DIEInteger::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
243 unsigned Size = ~0U;
244 switch (Form) {
245 case dwarf::DW_FORM_flag_present:
246 // Emit something to keep the lines and comments in sync.
247 // FIXME: Is there a better way to do this?
248 Asm->OutStreamer->AddBlankLine();
249 return;
250 case dwarf::DW_FORM_flag: // Fall thru
251 case dwarf::DW_FORM_ref1: // Fall thru
252 case dwarf::DW_FORM_data1: Size = 1; break;
253 case dwarf::DW_FORM_ref2: // Fall thru
254 case dwarf::DW_FORM_data2: Size = 2; break;
255 case dwarf::DW_FORM_sec_offset: // Fall thru
256 case dwarf::DW_FORM_strp: // Fall thru
257 case dwarf::DW_FORM_ref4: // Fall thru
258 case dwarf::DW_FORM_data4: Size = 4; break;
259 case dwarf::DW_FORM_ref8: // Fall thru
260 case dwarf::DW_FORM_ref_sig8: // Fall thru
261 case dwarf::DW_FORM_data8: Size = 8; break;
262 case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
263 case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
264 case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
265 case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
266 case dwarf::DW_FORM_addr:
267 Size = Asm->getPointerSize();
268 break;
269 case dwarf::DW_FORM_ref_addr:
270 Size = SizeOf(Asm, dwarf::DW_FORM_ref_addr);
271 break;
272 default: llvm_unreachable("DIE Value form not supported yet");
273 }
274 Asm->OutStreamer->EmitIntValue(Integer, Size);
275 }
276
277 /// SizeOf - Determine size of integer value in bytes.
278 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const279 unsigned DIEInteger::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
280 switch (Form) {
281 case dwarf::DW_FORM_flag_present: return 0;
282 case dwarf::DW_FORM_flag: // Fall thru
283 case dwarf::DW_FORM_ref1: // Fall thru
284 case dwarf::DW_FORM_data1: return sizeof(int8_t);
285 case dwarf::DW_FORM_ref2: // Fall thru
286 case dwarf::DW_FORM_data2: return sizeof(int16_t);
287 case dwarf::DW_FORM_sec_offset: // Fall thru
288 case dwarf::DW_FORM_strp: // Fall thru
289 case dwarf::DW_FORM_ref4: // Fall thru
290 case dwarf::DW_FORM_data4: return sizeof(int32_t);
291 case dwarf::DW_FORM_ref8: // Fall thru
292 case dwarf::DW_FORM_ref_sig8: // Fall thru
293 case dwarf::DW_FORM_data8: return sizeof(int64_t);
294 case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
295 case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
296 case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
297 case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
298 case dwarf::DW_FORM_addr:
299 return AP->getPointerSize();
300 case dwarf::DW_FORM_ref_addr:
301 if (AP->OutStreamer->getContext().getDwarfVersion() == 2)
302 return AP->getPointerSize();
303 return sizeof(int32_t);
304 default: llvm_unreachable("DIE Value form not supported yet");
305 }
306 }
307
308 LLVM_DUMP_METHOD
print(raw_ostream & O) const309 void DIEInteger::print(raw_ostream &O) const {
310 O << "Int: " << (int64_t)Integer << " 0x";
311 O.write_hex(Integer);
312 }
313
314 //===----------------------------------------------------------------------===//
315 // DIEExpr Implementation
316 //===----------------------------------------------------------------------===//
317
318 /// EmitValue - Emit expression value.
319 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const320 void DIEExpr::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
321 AP->OutStreamer->EmitValue(Expr, SizeOf(AP, Form));
322 }
323
324 /// SizeOf - Determine size of expression value in bytes.
325 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const326 unsigned DIEExpr::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
327 if (Form == dwarf::DW_FORM_data4) return 4;
328 if (Form == dwarf::DW_FORM_sec_offset) return 4;
329 if (Form == dwarf::DW_FORM_strp) return 4;
330 return AP->getPointerSize();
331 }
332
333 LLVM_DUMP_METHOD
print(raw_ostream & O) const334 void DIEExpr::print(raw_ostream &O) const { O << "Expr: " << *Expr; }
335
336 //===----------------------------------------------------------------------===//
337 // DIELabel Implementation
338 //===----------------------------------------------------------------------===//
339
340 /// EmitValue - Emit label value.
341 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const342 void DIELabel::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
343 AP->EmitLabelReference(Label, SizeOf(AP, Form),
344 Form == dwarf::DW_FORM_strp ||
345 Form == dwarf::DW_FORM_sec_offset ||
346 Form == dwarf::DW_FORM_ref_addr);
347 }
348
349 /// SizeOf - Determine size of label value in bytes.
350 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const351 unsigned DIELabel::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
352 if (Form == dwarf::DW_FORM_data4) return 4;
353 if (Form == dwarf::DW_FORM_sec_offset) return 4;
354 if (Form == dwarf::DW_FORM_strp) return 4;
355 return AP->getPointerSize();
356 }
357
358 LLVM_DUMP_METHOD
print(raw_ostream & O) const359 void DIELabel::print(raw_ostream &O) const { O << "Lbl: " << Label->getName(); }
360
361 //===----------------------------------------------------------------------===//
362 // DIEDelta Implementation
363 //===----------------------------------------------------------------------===//
364
365 /// EmitValue - Emit delta value.
366 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const367 void DIEDelta::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
368 AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
369 }
370
371 /// SizeOf - Determine size of delta value in bytes.
372 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const373 unsigned DIEDelta::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
374 if (Form == dwarf::DW_FORM_data4) return 4;
375 if (Form == dwarf::DW_FORM_sec_offset) return 4;
376 if (Form == dwarf::DW_FORM_strp) return 4;
377 return AP->getPointerSize();
378 }
379
380 LLVM_DUMP_METHOD
print(raw_ostream & O) const381 void DIEDelta::print(raw_ostream &O) const {
382 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
383 }
384
385 //===----------------------------------------------------------------------===//
386 // DIEString Implementation
387 //===----------------------------------------------------------------------===//
388
389 /// EmitValue - Emit string value.
390 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const391 void DIEString::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
392 assert(
393 (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
394 "Expected valid string form");
395
396 // Index of string in symbol table.
397 if (Form == dwarf::DW_FORM_GNU_str_index) {
398 DIEInteger(S.getIndex()).EmitValue(AP, Form);
399 return;
400 }
401
402 // Relocatable symbol.
403 assert(Form == dwarf::DW_FORM_strp);
404 if (AP->MAI->doesDwarfUseRelocationsAcrossSections()) {
405 DIELabel(S.getSymbol()).EmitValue(AP, Form);
406 return;
407 }
408
409 // Offset into symbol table.
410 DIEInteger(S.getOffset()).EmitValue(AP, Form);
411 }
412
413 /// SizeOf - Determine size of delta value in bytes.
414 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const415 unsigned DIEString::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
416 assert(
417 (Form == dwarf::DW_FORM_strp || Form == dwarf::DW_FORM_GNU_str_index) &&
418 "Expected valid string form");
419
420 // Index of string in symbol table.
421 if (Form == dwarf::DW_FORM_GNU_str_index)
422 return DIEInteger(S.getIndex()).SizeOf(AP, Form);
423
424 // Relocatable symbol.
425 if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
426 return DIELabel(S.getSymbol()).SizeOf(AP, Form);
427
428 // Offset into symbol table.
429 return DIEInteger(S.getOffset()).SizeOf(AP, Form);
430 }
431
432 LLVM_DUMP_METHOD
print(raw_ostream & O) const433 void DIEString::print(raw_ostream &O) const {
434 O << "String: " << S.getString();
435 }
436
437 //===----------------------------------------------------------------------===//
438 // DIEEntry Implementation
439 //===----------------------------------------------------------------------===//
440
441 /// EmitValue - Emit debug information entry offset.
442 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const443 void DIEEntry::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
444
445 if (Form == dwarf::DW_FORM_ref_addr) {
446 const DwarfDebug *DD = AP->getDwarfDebug();
447 unsigned Addr = Entry->getOffset();
448 assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
449 // For DW_FORM_ref_addr, output the offset from beginning of debug info
450 // section. Entry->getOffset() returns the offset from start of the
451 // compile unit.
452 DwarfCompileUnit *CU = DD->lookupUnit(Entry->getUnit());
453 assert(CU && "CUDie should belong to a CU.");
454 Addr += CU->getDebugInfoOffset();
455 if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
456 AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
457 DIEEntry::getRefAddrSize(AP));
458 else
459 AP->OutStreamer->EmitIntValue(Addr, DIEEntry::getRefAddrSize(AP));
460 } else
461 AP->EmitInt32(Entry->getOffset());
462 }
463
getRefAddrSize(const AsmPrinter * AP)464 unsigned DIEEntry::getRefAddrSize(const AsmPrinter *AP) {
465 // DWARF4: References that use the attribute form DW_FORM_ref_addr are
466 // specified to be four bytes in the DWARF 32-bit format and eight bytes
467 // in the DWARF 64-bit format, while DWARF Version 2 specifies that such
468 // references have the same size as an address on the target system.
469 const DwarfDebug *DD = AP->getDwarfDebug();
470 assert(DD && "Expected Dwarf Debug info to be available");
471 if (DD->getDwarfVersion() == 2)
472 return AP->getPointerSize();
473 return sizeof(int32_t);
474 }
475
476 LLVM_DUMP_METHOD
print(raw_ostream & O) const477 void DIEEntry::print(raw_ostream &O) const {
478 O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
479 }
480
481 //===----------------------------------------------------------------------===//
482 // DIETypeSignature Implementation
483 //===----------------------------------------------------------------------===//
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const484 void DIETypeSignature::EmitValue(const AsmPrinter *Asm,
485 dwarf::Form Form) const {
486 assert(Form == dwarf::DW_FORM_ref_sig8);
487 Asm->OutStreamer->EmitIntValue(Unit->getTypeSignature(), 8);
488 }
489
490 LLVM_DUMP_METHOD
print(raw_ostream & O) const491 void DIETypeSignature::print(raw_ostream &O) const {
492 O << format("Type Unit: 0x%lx", Unit->getTypeSignature());
493 }
494
495 //===----------------------------------------------------------------------===//
496 // DIELoc Implementation
497 //===----------------------------------------------------------------------===//
498
499 /// ComputeSize - calculate the size of the location expression.
500 ///
ComputeSize(const AsmPrinter * AP) const501 unsigned DIELoc::ComputeSize(const AsmPrinter *AP) const {
502 if (!Size) {
503 for (const auto &V : values())
504 Size += V.SizeOf(AP);
505 }
506
507 return Size;
508 }
509
510 /// EmitValue - Emit location data.
511 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const512 void DIELoc::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
513 switch (Form) {
514 default: llvm_unreachable("Improper form for block");
515 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
516 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
517 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
518 case dwarf::DW_FORM_block:
519 case dwarf::DW_FORM_exprloc:
520 Asm->EmitULEB128(Size); break;
521 }
522
523 for (const auto &V : values())
524 V.EmitValue(Asm);
525 }
526
527 /// SizeOf - Determine size of location data in bytes.
528 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const529 unsigned DIELoc::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
530 switch (Form) {
531 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
532 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
533 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
534 case dwarf::DW_FORM_block:
535 case dwarf::DW_FORM_exprloc:
536 return Size + getULEB128Size(Size);
537 default: llvm_unreachable("Improper form for block");
538 }
539 }
540
541 LLVM_DUMP_METHOD
print(raw_ostream & O) const542 void DIELoc::print(raw_ostream &O) const {
543 printValues(O, *this, "ExprLoc", Size, 5);
544 }
545
546 //===----------------------------------------------------------------------===//
547 // DIEBlock Implementation
548 //===----------------------------------------------------------------------===//
549
550 /// ComputeSize - calculate the size of the block.
551 ///
ComputeSize(const AsmPrinter * AP) const552 unsigned DIEBlock::ComputeSize(const AsmPrinter *AP) const {
553 if (!Size) {
554 for (const auto &V : values())
555 Size += V.SizeOf(AP);
556 }
557
558 return Size;
559 }
560
561 /// EmitValue - Emit block data.
562 ///
EmitValue(const AsmPrinter * Asm,dwarf::Form Form) const563 void DIEBlock::EmitValue(const AsmPrinter *Asm, dwarf::Form Form) const {
564 switch (Form) {
565 default: llvm_unreachable("Improper form for block");
566 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
567 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
568 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
569 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break;
570 }
571
572 for (const auto &V : values())
573 V.EmitValue(Asm);
574 }
575
576 /// SizeOf - Determine size of block data in bytes.
577 ///
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const578 unsigned DIEBlock::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
579 switch (Form) {
580 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
581 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
582 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
583 case dwarf::DW_FORM_block: return Size + getULEB128Size(Size);
584 default: llvm_unreachable("Improper form for block");
585 }
586 }
587
588 LLVM_DUMP_METHOD
print(raw_ostream & O) const589 void DIEBlock::print(raw_ostream &O) const {
590 printValues(O, *this, "Blk", Size, 5);
591 }
592
593 //===----------------------------------------------------------------------===//
594 // DIELocList Implementation
595 //===----------------------------------------------------------------------===//
596
SizeOf(const AsmPrinter * AP,dwarf::Form Form) const597 unsigned DIELocList::SizeOf(const AsmPrinter *AP, dwarf::Form Form) const {
598 if (Form == dwarf::DW_FORM_data4)
599 return 4;
600 if (Form == dwarf::DW_FORM_sec_offset)
601 return 4;
602 return AP->getPointerSize();
603 }
604
605 /// EmitValue - Emit label value.
606 ///
EmitValue(const AsmPrinter * AP,dwarf::Form Form) const607 void DIELocList::EmitValue(const AsmPrinter *AP, dwarf::Form Form) const {
608 DwarfDebug *DD = AP->getDwarfDebug();
609 MCSymbol *Label = DD->getDebugLocs().getList(Index).Label;
610 AP->emitDwarfSymbolReference(Label, /*ForceOffset*/ DD->useSplitDwarf());
611 }
612
613 LLVM_DUMP_METHOD
print(raw_ostream & O) const614 void DIELocList::print(raw_ostream &O) const { O << "LocList: " << Index; }
615