Bug Summary

File:llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
Warning:line 861, column 38
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name DwarfUnit.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/lib/CodeGen/AsmPrinter -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-11-29-190409-37574-1 -x c++ /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
1//===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains support for constructing a dwarf compile unit.
10//
11//===----------------------------------------------------------------------===//
12
13#include "DwarfUnit.h"
14#include "AddressPool.h"
15#include "DwarfCompileUnit.h"
16#include "DwarfExpression.h"
17#include "llvm/ADT/APFloat.h"
18#include "llvm/ADT/APInt.h"
19#include "llvm/ADT/None.h"
20#include "llvm/ADT/StringExtras.h"
21#include "llvm/ADT/iterator_range.h"
22#include "llvm/CodeGen/MachineFunction.h"
23#include "llvm/CodeGen/MachineOperand.h"
24#include "llvm/CodeGen/TargetRegisterInfo.h"
25#include "llvm/CodeGen/TargetSubtargetInfo.h"
26#include "llvm/IR/Constants.h"
27#include "llvm/IR/DataLayout.h"
28#include "llvm/IR/GlobalValue.h"
29#include "llvm/IR/Metadata.h"
30#include "llvm/MC/MCAsmInfo.h"
31#include "llvm/MC/MCContext.h"
32#include "llvm/MC/MCDwarf.h"
33#include "llvm/MC/MCSection.h"
34#include "llvm/MC/MCStreamer.h"
35#include "llvm/MC/MachineLocation.h"
36#include "llvm/Support/Casting.h"
37#include "llvm/Support/CommandLine.h"
38#include "llvm/Target/TargetLoweringObjectFile.h"
39#include <cassert>
40#include <cstdint>
41#include <string>
42#include <utility>
43
44using namespace llvm;
45
46#define DEBUG_TYPE"dwarfdebug" "dwarfdebug"
47
48DIEDwarfExpression::DIEDwarfExpression(const AsmPrinter &AP,
49 DwarfCompileUnit &CU, DIELoc &DIE)
50 : DwarfExpression(AP.getDwarfVersion(), CU), AP(AP), OutDIE(DIE) {}
51
52void DIEDwarfExpression::emitOp(uint8_t Op, const char* Comment) {
53 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Op);
54}
55
56void DIEDwarfExpression::emitSigned(int64_t Value) {
57 CU.addSInt(getActiveDIE(), dwarf::DW_FORM_sdata, Value);
58}
59
60void DIEDwarfExpression::emitUnsigned(uint64_t Value) {
61 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_udata, Value);
62}
63
64void DIEDwarfExpression::emitData1(uint8_t Value) {
65 CU.addUInt(getActiveDIE(), dwarf::DW_FORM_data1, Value);
66}
67
68void DIEDwarfExpression::emitBaseTypeRef(uint64_t Idx) {
69 CU.addBaseTypeRef(getActiveDIE(), Idx);
70}
71
72void DIEDwarfExpression::enableTemporaryBuffer() {
73 assert(!IsBuffering && "Already buffering?")((!IsBuffering && "Already buffering?") ? static_cast
<void> (0) : __assert_fail ("!IsBuffering && \"Already buffering?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 73, __PRETTY_FUNCTION__))
;
74 IsBuffering = true;
75}
76
77void DIEDwarfExpression::disableTemporaryBuffer() { IsBuffering = false; }
78
79unsigned DIEDwarfExpression::getTemporaryBufferSize() {
80 return TmpDIE.ComputeSize(&AP);
81}
82
83void DIEDwarfExpression::commitTemporaryBuffer() { OutDIE.takeValues(TmpDIE); }
84
85bool DIEDwarfExpression::isFrameRegister(const TargetRegisterInfo &TRI,
86 llvm::Register MachineReg) {
87 return MachineReg == TRI.getFrameRegister(*AP.MF);
88}
89
90DwarfUnit::DwarfUnit(dwarf::Tag UnitTag, const DICompileUnit *Node,
91 AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU)
92 : DIEUnit(UnitTag), CUNode(Node), Asm(A), DD(DW), DU(DWU),
93 IndexTyDie(nullptr) {}
94
95DwarfTypeUnit::DwarfTypeUnit(DwarfCompileUnit &CU, AsmPrinter *A,
96 DwarfDebug *DW, DwarfFile *DWU,
97 MCDwarfDwoLineTable *SplitLineTable)
98 : DwarfUnit(dwarf::DW_TAG_type_unit, CU.getCUNode(), A, DW, DWU), CU(CU),
99 SplitLineTable(SplitLineTable) {
100}
101
102DwarfUnit::~DwarfUnit() {
103 for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
104 DIEBlocks[j]->~DIEBlock();
105 for (unsigned j = 0, M = DIELocs.size(); j < M; ++j)
106 DIELocs[j]->~DIELoc();
107}
108
109int64_t DwarfUnit::getDefaultLowerBound() const {
110 switch (getLanguage()) {
111 default:
112 break;
113
114 // The languages below have valid values in all DWARF versions.
115 case dwarf::DW_LANG_C:
116 case dwarf::DW_LANG_C89:
117 case dwarf::DW_LANG_C_plus_plus:
118 return 0;
119
120 case dwarf::DW_LANG_Fortran77:
121 case dwarf::DW_LANG_Fortran90:
122 return 1;
123
124 // The languages below have valid values only if the DWARF version >= 3.
125 case dwarf::DW_LANG_C99:
126 case dwarf::DW_LANG_ObjC:
127 case dwarf::DW_LANG_ObjC_plus_plus:
128 if (DD->getDwarfVersion() >= 3)
129 return 0;
130 break;
131
132 case dwarf::DW_LANG_Fortran95:
133 if (DD->getDwarfVersion() >= 3)
134 return 1;
135 break;
136
137 // Starting with DWARF v4, all defined languages have valid values.
138 case dwarf::DW_LANG_D:
139 case dwarf::DW_LANG_Java:
140 case dwarf::DW_LANG_Python:
141 case dwarf::DW_LANG_UPC:
142 if (DD->getDwarfVersion() >= 4)
143 return 0;
144 break;
145
146 case dwarf::DW_LANG_Ada83:
147 case dwarf::DW_LANG_Ada95:
148 case dwarf::DW_LANG_Cobol74:
149 case dwarf::DW_LANG_Cobol85:
150 case dwarf::DW_LANG_Modula2:
151 case dwarf::DW_LANG_Pascal83:
152 case dwarf::DW_LANG_PLI:
153 if (DD->getDwarfVersion() >= 4)
154 return 1;
155 break;
156
157 // The languages below are new in DWARF v5.
158 case dwarf::DW_LANG_BLISS:
159 case dwarf::DW_LANG_C11:
160 case dwarf::DW_LANG_C_plus_plus_03:
161 case dwarf::DW_LANG_C_plus_plus_11:
162 case dwarf::DW_LANG_C_plus_plus_14:
163 case dwarf::DW_LANG_Dylan:
164 case dwarf::DW_LANG_Go:
165 case dwarf::DW_LANG_Haskell:
166 case dwarf::DW_LANG_OCaml:
167 case dwarf::DW_LANG_OpenCL:
168 case dwarf::DW_LANG_RenderScript:
169 case dwarf::DW_LANG_Rust:
170 case dwarf::DW_LANG_Swift:
171 if (DD->getDwarfVersion() >= 5)
172 return 0;
173 break;
174
175 case dwarf::DW_LANG_Fortran03:
176 case dwarf::DW_LANG_Fortran08:
177 case dwarf::DW_LANG_Julia:
178 case dwarf::DW_LANG_Modula3:
179 if (DD->getDwarfVersion() >= 5)
180 return 1;
181 break;
182 }
183
184 return -1;
185}
186
187/// Check whether the DIE for this MDNode can be shared across CUs.
188bool DwarfUnit::isShareableAcrossCUs(const DINode *D) const {
189 // When the MDNode can be part of the type system (this includes subprogram
190 // declarations *and* subprogram definitions, even local definitions), the
191 // DIE must be shared across CUs.
192 // Combining type units and cross-CU DIE sharing is lower value (since
193 // cross-CU DIE sharing is used in LTO and removes type redundancy at that
194 // level already) but may be implementable for some value in projects
195 // building multiple independent libraries with LTO and then linking those
196 // together.
197 if (isDwoUnit() && !DD->shareAcrossDWOCUs())
198 return false;
199 return (isa<DIType>(D) || isa<DISubprogram>(D)) && !DD->generateTypeUnits();
200}
201
202DIE *DwarfUnit::getDIE(const DINode *D) const {
203 if (isShareableAcrossCUs(D))
204 return DU->getDIE(D);
205 return MDNodeToDieMap.lookup(D);
206}
207
208void DwarfUnit::insertDIE(const DINode *Desc, DIE *D) {
209 if (isShareableAcrossCUs(Desc)) {
210 DU->insertDIE(Desc, D);
211 return;
212 }
213 MDNodeToDieMap.insert(std::make_pair(Desc, D));
214}
215
216void DwarfUnit::insertDIE(DIE *D) {
217 MDNodeToDieMap.insert(std::make_pair(nullptr, D));
218}
219
220void DwarfUnit::addFlag(DIE &Die, dwarf::Attribute Attribute) {
221 if (DD->getDwarfVersion() >= 4)
222 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag_present,
223 DIEInteger(1));
224 else
225 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_flag,
226 DIEInteger(1));
227}
228
229void DwarfUnit::addUInt(DIEValueList &Die, dwarf::Attribute Attribute,
230 Optional<dwarf::Form> Form, uint64_t Integer) {
231 if (!Form)
232 Form = DIEInteger::BestForm(false, Integer);
233 assert(Form != dwarf::DW_FORM_implicit_const &&((Form != dwarf::DW_FORM_implicit_const && "DW_FORM_implicit_const is used only for signed integers"
) ? static_cast<void> (0) : __assert_fail ("Form != dwarf::DW_FORM_implicit_const && \"DW_FORM_implicit_const is used only for signed integers\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 234, __PRETTY_FUNCTION__))
234 "DW_FORM_implicit_const is used only for signed integers")((Form != dwarf::DW_FORM_implicit_const && "DW_FORM_implicit_const is used only for signed integers"
) ? static_cast<void> (0) : __assert_fail ("Form != dwarf::DW_FORM_implicit_const && \"DW_FORM_implicit_const is used only for signed integers\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 234, __PRETTY_FUNCTION__))
;
235 Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
236}
237
238void DwarfUnit::addUInt(DIEValueList &Block, dwarf::Form Form,
239 uint64_t Integer) {
240 addUInt(Block, (dwarf::Attribute)0, Form, Integer);
241}
242
243void DwarfUnit::addSInt(DIEValueList &Die, dwarf::Attribute Attribute,
244 Optional<dwarf::Form> Form, int64_t Integer) {
245 if (!Form)
246 Form = DIEInteger::BestForm(true, Integer);
247 Die.addValue(DIEValueAllocator, Attribute, *Form, DIEInteger(Integer));
248}
249
250void DwarfUnit::addSInt(DIELoc &Die, Optional<dwarf::Form> Form,
251 int64_t Integer) {
252 addSInt(Die, (dwarf::Attribute)0, Form, Integer);
253}
254
255void DwarfUnit::addString(DIE &Die, dwarf::Attribute Attribute,
256 StringRef String) {
257 if (CUNode->isDebugDirectivesOnly())
258 return;
259
260 if (DD->useInlineStrings()) {
261 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_string,
262 new (DIEValueAllocator)
263 DIEInlineString(String, DIEValueAllocator));
264 return;
265 }
266 dwarf::Form IxForm =
267 isDwoUnit() ? dwarf::DW_FORM_GNU_str_index : dwarf::DW_FORM_strp;
268
269 auto StringPoolEntry =
270 useSegmentedStringOffsetsTable() || IxForm == dwarf::DW_FORM_GNU_str_index
271 ? DU->getStringPool().getIndexedEntry(*Asm, String)
272 : DU->getStringPool().getEntry(*Asm, String);
273
274 // For DWARF v5 and beyond, use the smallest strx? form possible.
275 if (useSegmentedStringOffsetsTable()) {
276 IxForm = dwarf::DW_FORM_strx1;
277 unsigned Index = StringPoolEntry.getIndex();
278 if (Index > 0xffffff)
279 IxForm = dwarf::DW_FORM_strx4;
280 else if (Index > 0xffff)
281 IxForm = dwarf::DW_FORM_strx3;
282 else if (Index > 0xff)
283 IxForm = dwarf::DW_FORM_strx2;
284 }
285 Die.addValue(DIEValueAllocator, Attribute, IxForm,
286 DIEString(StringPoolEntry));
287}
288
289DIEValueList::value_iterator DwarfUnit::addLabel(DIEValueList &Die,
290 dwarf::Attribute Attribute,
291 dwarf::Form Form,
292 const MCSymbol *Label) {
293 return Die.addValue(DIEValueAllocator, Attribute, Form, DIELabel(Label));
294}
295
296void DwarfUnit::addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label) {
297 addLabel(Die, (dwarf::Attribute)0, Form, Label);
298}
299
300void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute,
301 uint64_t Integer) {
302 addUInt(Die, Attribute, DD->getDwarfSectionOffsetForm(), Integer);
303}
304
305unsigned DwarfTypeUnit::getOrCreateSourceID(const DIFile *File) {
306 if (!SplitLineTable)
307 return getCU().getOrCreateSourceID(File);
308 if (!UsedLineTable) {
309 UsedLineTable = true;
310 // This is a split type unit that needs a line table.
311 addSectionOffset(getUnitDie(), dwarf::DW_AT_stmt_list, 0);
312 }
313 return SplitLineTable->getFile(
314 File->getDirectory(), File->getFilename(), DD->getMD5AsBytes(File),
315 Asm->OutContext.getDwarfVersion(), File->getSource());
316}
317
318void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) {
319 if (DD->getDwarfVersion() >= 5) {
320 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addrx);
321 addUInt(Die, dwarf::DW_FORM_addrx, DD->getAddressPool().getIndex(Sym));
322 return;
323 }
324
325 if (DD->useSplitDwarf()) {
326 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
327 addUInt(Die, dwarf::DW_FORM_GNU_addr_index,
328 DD->getAddressPool().getIndex(Sym));
329 return;
330 }
331
332 addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
333 addLabel(Die, dwarf::DW_FORM_addr, Sym);
334}
335
336void DwarfUnit::addLabelDelta(DIE &Die, dwarf::Attribute Attribute,
337 const MCSymbol *Hi, const MCSymbol *Lo) {
338 Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_data4,
339 new (DIEValueAllocator) DIEDelta(Hi, Lo));
340}
341
342void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry) {
343 addDIEEntry(Die, Attribute, DIEEntry(Entry));
344}
345
346void DwarfUnit::addDIETypeSignature(DIE &Die, uint64_t Signature) {
347 // Flag the type unit reference as a declaration so that if it contains
348 // members (implicit special members, static data member definitions, member
349 // declarations for definitions in this CU, etc) consumers don't get confused
350 // and think this is a full definition.
351 addFlag(Die, dwarf::DW_AT_declaration);
352
353 Die.addValue(DIEValueAllocator, dwarf::DW_AT_signature,
354 dwarf::DW_FORM_ref_sig8, DIEInteger(Signature));
355}
356
357void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute,
358 DIEEntry Entry) {
359 const DIEUnit *CU = Die.getUnit();
360 const DIEUnit *EntryCU = Entry.getEntry().getUnit();
361 if (!CU)
362 // We assume that Die belongs to this CU, if it is not linked to any CU yet.
363 CU = getUnitDie().getUnit();
364 if (!EntryCU)
365 EntryCU = getUnitDie().getUnit();
366 Die.addValue(DIEValueAllocator, Attribute,
367 EntryCU == CU ? dwarf::DW_FORM_ref4 : dwarf::DW_FORM_ref_addr,
368 Entry);
369}
370
371DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N) {
372 DIE &Die = Parent.addChild(DIE::get(DIEValueAllocator, (dwarf::Tag)Tag));
373 if (N)
374 insertDIE(N, &Die);
375 return Die;
376}
377
378void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Loc) {
379 Loc->ComputeSize(Asm);
380 DIELocs.push_back(Loc); // Memoize so we can call the destructor later on.
381 Die.addValue(DIEValueAllocator, Attribute,
382 Loc->BestForm(DD->getDwarfVersion()), Loc);
383}
384
385void DwarfUnit::addBlock(DIE &Die, dwarf::Attribute Attribute,
386 DIEBlock *Block) {
387 Block->ComputeSize(Asm);
388 DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
389 Die.addValue(DIEValueAllocator, Attribute, Block->BestForm(), Block);
390}
391
392void DwarfUnit::addSourceLine(DIE &Die, unsigned Line, const DIFile *File) {
393 if (Line == 0)
394 return;
395
396 unsigned FileID = getOrCreateSourceID(File);
397 addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
398 addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
399}
400
401void DwarfUnit::addSourceLine(DIE &Die, const DILocalVariable *V) {
402 assert(V)((V) ? static_cast<void> (0) : __assert_fail ("V", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 402, __PRETTY_FUNCTION__))
;
403
404 addSourceLine(Die, V->getLine(), V->getFile());
405}
406
407void DwarfUnit::addSourceLine(DIE &Die, const DIGlobalVariable *G) {
408 assert(G)((G) ? static_cast<void> (0) : __assert_fail ("G", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 408, __PRETTY_FUNCTION__))
;
409
410 addSourceLine(Die, G->getLine(), G->getFile());
411}
412
413void DwarfUnit::addSourceLine(DIE &Die, const DISubprogram *SP) {
414 assert(SP)((SP) ? static_cast<void> (0) : __assert_fail ("SP", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 414, __PRETTY_FUNCTION__))
;
415
416 addSourceLine(Die, SP->getLine(), SP->getFile());
417}
418
419void DwarfUnit::addSourceLine(DIE &Die, const DILabel *L) {
420 assert(L)((L) ? static_cast<void> (0) : __assert_fail ("L", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 420, __PRETTY_FUNCTION__))
;
421
422 addSourceLine(Die, L->getLine(), L->getFile());
423}
424
425void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
426 assert(Ty)((Ty) ? static_cast<void> (0) : __assert_fail ("Ty", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 426, __PRETTY_FUNCTION__))
;
427
428 addSourceLine(Die, Ty->getLine(), Ty->getFile());
429}
430
431void DwarfUnit::addSourceLine(DIE &Die, const DIObjCProperty *Ty) {
432 assert(Ty)((Ty) ? static_cast<void> (0) : __assert_fail ("Ty", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 432, __PRETTY_FUNCTION__))
;
433
434 addSourceLine(Die, Ty->getLine(), Ty->getFile());
435}
436
437void DwarfUnit::addConstantFPValue(DIE &Die, const ConstantFP *CFP) {
438 // Pass this down to addConstantValue as an unsigned bag of bits.
439 addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
440}
441
442void DwarfUnit::addConstantValue(DIE &Die, const ConstantInt *CI,
443 const DIType *Ty) {
444 addConstantValue(Die, CI->getValue(), Ty);
445}
446
447void DwarfUnit::addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty) {
448 addConstantValue(Die, DD->isUnsignedDIType(Ty), Val);
449}
450
451void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
452 // FIXME: This is a bit conservative/simple - it emits negative values always
453 // sign extended to 64 bits rather than minimizing the number of bytes.
454 addUInt(Die, dwarf::DW_AT_const_value,
455 Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
456}
457
458void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty) {
459 addConstantValue(Die, Val, DD->isUnsignedDIType(Ty));
460}
461
462void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, bool Unsigned) {
463 unsigned CIBitWidth = Val.getBitWidth();
464 if (CIBitWidth <= 64) {
465 addConstantValue(Die, Unsigned,
466 Unsigned ? Val.getZExtValue() : Val.getSExtValue());
467 return;
468 }
469
470 DIEBlock *Block = new (DIEValueAllocator) DIEBlock;
471
472 // Get the raw data form of the large APInt.
473 const uint64_t *Ptr64 = Val.getRawData();
474
475 int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
476 bool LittleEndian = Asm->getDataLayout().isLittleEndian();
477
478 // Output the constant to DWARF one byte at a time.
479 for (int i = 0; i < NumBytes; i++) {
480 uint8_t c;
481 if (LittleEndian)
482 c = Ptr64[i / 8] >> (8 * (i & 7));
483 else
484 c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
485 addUInt(*Block, dwarf::DW_FORM_data1, c);
486 }
487
488 addBlock(Die, dwarf::DW_AT_const_value, Block);
489}
490
491void DwarfUnit::addLinkageName(DIE &Die, StringRef LinkageName) {
492 if (!LinkageName.empty())
493 addString(Die,
494 DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
495 : dwarf::DW_AT_MIPS_linkage_name,
496 GlobalValue::dropLLVMManglingEscape(LinkageName));
497}
498
499void DwarfUnit::addTemplateParams(DIE &Buffer, DINodeArray TParams) {
500 // Add template parameters.
501 for (const auto *Element : TParams) {
502 if (auto *TTP = dyn_cast<DITemplateTypeParameter>(Element))
503 constructTemplateTypeParameterDIE(Buffer, TTP);
504 else if (auto *TVP = dyn_cast<DITemplateValueParameter>(Element))
505 constructTemplateValueParameterDIE(Buffer, TVP);
506 }
507}
508
509/// Add thrown types.
510void DwarfUnit::addThrownTypes(DIE &Die, DINodeArray ThrownTypes) {
511 for (const auto *Ty : ThrownTypes) {
512 DIE &TT = createAndAddDIE(dwarf::DW_TAG_thrown_type, Die);
513 addType(TT, cast<DIType>(Ty));
514 }
515}
516
517DIE *DwarfUnit::getOrCreateContextDIE(const DIScope *Context) {
518 if (!Context || isa<DIFile>(Context))
519 return &getUnitDie();
520 if (auto *T = dyn_cast<DIType>(Context))
521 return getOrCreateTypeDIE(T);
522 if (auto *NS = dyn_cast<DINamespace>(Context))
523 return getOrCreateNameSpace(NS);
524 if (auto *SP = dyn_cast<DISubprogram>(Context))
525 return getOrCreateSubprogramDIE(SP);
526 if (auto *M = dyn_cast<DIModule>(Context))
527 return getOrCreateModule(M);
528 return getDIE(Context);
529}
530
531DIE *DwarfUnit::createTypeDIE(const DICompositeType *Ty) {
532 auto *Context = Ty->getScope();
533 DIE *ContextDIE = getOrCreateContextDIE(Context);
534
535 if (DIE *TyDIE = getDIE(Ty))
4
Assuming 'TyDIE' is null
5
Taking false branch
536 return TyDIE;
537
538 // Create new type.
539 DIE &TyDIE = createAndAddDIE(Ty->getTag(), *ContextDIE, Ty);
540
541 constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
6
'Ty' is a 'DICompositeType'
7
Calling 'DwarfUnit::constructTypeDIE'
542
543 updateAcceleratorTables(Context, Ty, TyDIE);
544 return &TyDIE;
545}
546
547DIE *DwarfUnit::createTypeDIE(const DIScope *Context, DIE &ContextDIE,
548 const DIType *Ty) {
549 // Create new type.
550 DIE &TyDIE = createAndAddDIE(Ty->getTag(), ContextDIE, Ty);
551
552 updateAcceleratorTables(Context, Ty, TyDIE);
553
554 if (auto *BT = dyn_cast<DIBasicType>(Ty))
555 constructTypeDIE(TyDIE, BT);
556 else if (auto *ST = dyn_cast<DIStringType>(Ty))
557 constructTypeDIE(TyDIE, ST);
558 else if (auto *STy = dyn_cast<DISubroutineType>(Ty))
559 constructTypeDIE(TyDIE, STy);
560 else if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
561 if (DD->generateTypeUnits() && !Ty->isForwardDecl() &&
562 (Ty->getRawName() || CTy->getRawIdentifier())) {
563 // Skip updating the accelerator tables since this is not the full type.
564 if (MDString *TypeId = CTy->getRawIdentifier())
565 DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
566 else {
567 auto X = DD->enterNonTypeUnitContext();
568 finishNonUnitTypeDIE(TyDIE, CTy);
569 }
570 return &TyDIE;
571 }
572 constructTypeDIE(TyDIE, CTy);
573 } else {
574 constructTypeDIE(TyDIE, cast<DIDerivedType>(Ty));
575 }
576
577 return &TyDIE;
578}
579
580DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
581 if (!TyNode)
582 return nullptr;
583
584 auto *Ty = cast<DIType>(TyNode);
585
586 // DW_TAG_restrict_type is not supported in DWARF2
587 if (Ty->getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
588 return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
589
590 // DW_TAG_atomic_type is not supported in DWARF < 5
591 if (Ty->getTag() == dwarf::DW_TAG_atomic_type && DD->getDwarfVersion() < 5)
592 return getOrCreateTypeDIE(cast<DIDerivedType>(Ty)->getBaseType());
593
594 // Construct the context before querying for the existence of the DIE in case
595 // such construction creates the DIE.
596 auto *Context = Ty->getScope();
597 DIE *ContextDIE = getOrCreateContextDIE(Context);
598 assert(ContextDIE)((ContextDIE) ? static_cast<void> (0) : __assert_fail (
"ContextDIE", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 598, __PRETTY_FUNCTION__))
;
599
600 if (DIE *TyDIE = getDIE(Ty))
601 return TyDIE;
602
603 return static_cast<DwarfUnit *>(ContextDIE->getUnit())
604 ->createTypeDIE(Context, *ContextDIE, Ty);
605}
606
607void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
608 const DIType *Ty, const DIE &TyDIE) {
609 if (!Ty->getName().empty() && !Ty->isForwardDecl()) {
610 bool IsImplementation = false;
611 if (auto *CT = dyn_cast<DICompositeType>(Ty)) {
612 // A runtime language of 0 actually means C/C++ and that any
613 // non-negative value is some version of Objective-C/C++.
614 IsImplementation = CT->getRuntimeLang() == 0 || CT->isObjcClassComplete();
615 }
616 unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
617 DD->addAccelType(*CUNode, Ty->getName(), TyDIE, Flags);
618
619 if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
620 isa<DINamespace>(Context) || isa<DICommonBlock>(Context))
621 addGlobalType(Ty, TyDIE, Context);
622 }
623}
624
625void DwarfUnit::addType(DIE &Entity, const DIType *Ty,
626 dwarf::Attribute Attribute) {
627 assert(Ty && "Trying to add a type that doesn't exist?")((Ty && "Trying to add a type that doesn't exist?") ?
static_cast<void> (0) : __assert_fail ("Ty && \"Trying to add a type that doesn't exist?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 627, __PRETTY_FUNCTION__))
;
628 addDIEEntry(Entity, Attribute, DIEEntry(*getOrCreateTypeDIE(Ty)));
629}
630
631std::string DwarfUnit::getParentContextString(const DIScope *Context) const {
632 if (!Context)
633 return "";
634
635 // FIXME: Decide whether to implement this for non-C++ languages.
636 if (!dwarf::isCPlusPlus((dwarf::SourceLanguage)getLanguage()))
637 return "";
638
639 std::string CS;
640 SmallVector<const DIScope *, 1> Parents;
641 while (!isa<DICompileUnit>(Context)) {
642 Parents.push_back(Context);
643 if (const DIScope *S = Context->getScope())
644 Context = S;
645 else
646 // Structure, etc types will have a NULL context if they're at the top
647 // level.
648 break;
649 }
650
651 // Reverse iterate over our list to go from the outermost construct to the
652 // innermost.
653 for (const DIScope *Ctx : make_range(Parents.rbegin(), Parents.rend())) {
654 StringRef Name = Ctx->getName();
655 if (Name.empty() && isa<DINamespace>(Ctx))
656 Name = "(anonymous namespace)";
657 if (!Name.empty()) {
658 CS += Name;
659 CS += "::";
660 }
661 }
662 return CS;
663}
664
665void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIBasicType *BTy) {
666 // Get core information.
667 StringRef Name = BTy->getName();
668 // Add name if not anonymous or intermediate type.
669 if (!Name.empty())
670 addString(Buffer, dwarf::DW_AT_name, Name);
671
672 // An unspecified type only has a name attribute.
673 if (BTy->getTag() == dwarf::DW_TAG_unspecified_type)
674 return;
675
676 if (BTy->getTag() != dwarf::DW_TAG_string_type)
677 addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
678 BTy->getEncoding());
679
680 uint64_t Size = BTy->getSizeInBits() >> 3;
681 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
682
683 if (BTy->isBigEndian())
684 addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_big);
685 else if (BTy->isLittleEndian())
686 addUInt(Buffer, dwarf::DW_AT_endianity, None, dwarf::DW_END_little);
687}
688
689void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIStringType *STy) {
690 // Get core information.
691 StringRef Name = STy->getName();
692 // Add name if not anonymous or intermediate type.
693 if (!Name.empty())
694 addString(Buffer, dwarf::DW_AT_name, Name);
695
696 if (DIVariable *Var = STy->getStringLength()) {
697 if (auto *VarDIE = getDIE(Var))
698 addDIEEntry(Buffer, dwarf::DW_AT_string_length, *VarDIE);
699 } else {
700 uint64_t Size = STy->getSizeInBits() >> 3;
701 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
702 }
703
704 if (STy->getEncoding()) {
705 // For eventual Unicode support.
706 addUInt(Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
707 STy->getEncoding());
708 }
709}
710
711void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
712 // Get core information.
713 StringRef Name = DTy->getName();
714 uint64_t Size = DTy->getSizeInBits() >> 3;
715 uint16_t Tag = Buffer.getTag();
716
717 // Map to main type, void will not have a type.
718 const DIType *FromTy = DTy->getBaseType();
719 if (FromTy)
720 addType(Buffer, FromTy);
721
722 // Add name if not anonymous or intermediate type.
723 if (!Name.empty())
724 addString(Buffer, dwarf::DW_AT_name, Name);
725
726 // If alignment is specified for a typedef , create and insert DW_AT_alignment
727 // attribute in DW_TAG_typedef DIE.
728 if (Tag == dwarf::DW_TAG_typedef && DD->getDwarfVersion() >= 5) {
729 uint32_t AlignInBytes = DTy->getAlignInBytes();
730 if (AlignInBytes > 0)
731 addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
732 AlignInBytes);
733 }
734
735 // Add size if non-zero (derived types might be zero-sized.)
736 if (Size && Tag != dwarf::DW_TAG_pointer_type
737 && Tag != dwarf::DW_TAG_ptr_to_member_type
738 && Tag != dwarf::DW_TAG_reference_type
739 && Tag != dwarf::DW_TAG_rvalue_reference_type)
740 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
741
742 if (Tag == dwarf::DW_TAG_ptr_to_member_type)
743 addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
744 *getOrCreateTypeDIE(cast<DIDerivedType>(DTy)->getClassType()));
745 // Add source line info if available and TyDesc is not a forward declaration.
746 if (!DTy->isForwardDecl())
747 addSourceLine(Buffer, DTy);
748
749 // If DWARF address space value is other than None, add it. The IR
750 // verifier checks that DWARF address space only exists for pointer
751 // or reference types.
752 if (DTy->getDWARFAddressSpace())
753 addUInt(Buffer, dwarf::DW_AT_address_class, dwarf::DW_FORM_data4,
754 DTy->getDWARFAddressSpace().getValue());
755}
756
757void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args) {
758 for (unsigned i = 1, N = Args.size(); i < N; ++i) {
759 const DIType *Ty = Args[i];
760 if (!Ty) {
761 assert(i == N-1 && "Unspecified parameter must be the last argument")((i == N-1 && "Unspecified parameter must be the last argument"
) ? static_cast<void> (0) : __assert_fail ("i == N-1 && \"Unspecified parameter must be the last argument\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 761, __PRETTY_FUNCTION__))
;
762 createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
763 } else {
764 DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
765 addType(Arg, Ty);
766 if (Ty->isArtificial())
767 addFlag(Arg, dwarf::DW_AT_artificial);
768 }
769 }
770}
771
772void DwarfUnit::constructTypeDIE(DIE &Buffer, const DISubroutineType *CTy) {
773 // Add return type. A void return won't have a type.
774 auto Elements = cast<DISubroutineType>(CTy)->getTypeArray();
775 if (Elements.size())
776 if (auto RTy = Elements[0])
777 addType(Buffer, RTy);
778
779 bool isPrototyped = true;
780 if (Elements.size() == 2 && !Elements[1])
781 isPrototyped = false;
782
783 constructSubprogramArguments(Buffer, Elements);
784
785 // Add prototype flag if we're dealing with a C language and the function has
786 // been prototyped.
787 uint16_t Language = getLanguage();
788 if (isPrototyped &&
789 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
790 Language == dwarf::DW_LANG_ObjC))
791 addFlag(Buffer, dwarf::DW_AT_prototyped);
792
793 // Add a DW_AT_calling_convention if this has an explicit convention.
794 if (CTy->getCC() && CTy->getCC() != dwarf::DW_CC_normal)
795 addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
796 CTy->getCC());
797
798 if (CTy->isLValueReference())
799 addFlag(Buffer, dwarf::DW_AT_reference);
800
801 if (CTy->isRValueReference())
802 addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
803}
804
805void DwarfUnit::constructTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
806 // Add name if not anonymous or intermediate type.
807 StringRef Name = CTy->getName();
808
809 uint64_t Size = CTy->getSizeInBits() >> 3;
810 uint16_t Tag = Buffer.getTag();
811
812 switch (Tag) {
8
Control jumps to 'case DW_TAG_variant_part:' at line 819
25
Control jumps to 'case DW_TAG_variant_part:' at line 819
43
Control jumps to 'case DW_TAG_variant_part:' at line 819
813 case dwarf::DW_TAG_array_type:
814 constructArrayTypeDIE(Buffer, CTy);
815 break;
816 case dwarf::DW_TAG_enumeration_type:
817 constructEnumTypeDIE(Buffer, CTy);
818 break;
819 case dwarf::DW_TAG_variant_part:
820 case dwarf::DW_TAG_structure_type:
821 case dwarf::DW_TAG_union_type:
822 case dwarf::DW_TAG_class_type: {
823 // Emit the discriminator for a variant part.
824 DIDerivedType *Discriminator = nullptr;
825 if (Tag
8.1
'Tag' is equal to DW_TAG_variant_part
25.1
'Tag' is equal to DW_TAG_variant_part
43.1
'Tag' is equal to DW_TAG_variant_part
== dwarf::DW_TAG_variant_part) {
9
Taking true branch
26
Taking true branch
44
Taking true branch
826 Discriminator = CTy->getDiscriminator();
45
Value assigned to 'Discriminator'
827 if (Discriminator
9.1
'Discriminator' is non-null
) {
10
Taking true branch
27
Assuming 'Discriminator' is null
28
Taking false branch
46
Assuming 'Discriminator' is null
47
Taking false branch
828 // DWARF says:
829 // If the variant part has a discriminant, the discriminant is
830 // represented by a separate debugging information entry which is
831 // a child of the variant part entry.
832 DIE &DiscMember = constructMemberDIE(Buffer, Discriminator);
833 addDIEEntry(Buffer, dwarf::DW_AT_discr, DiscMember);
834 }
835 }
836
837 // Add template parameters to a class, structure or union types.
838 if (Tag
10.1
'Tag' is not equal to DW_TAG_class_type
28.1
'Tag' is not equal to DW_TAG_class_type
47.1
'Tag' is not equal to DW_TAG_class_type
== dwarf::DW_TAG_class_type ||
11
Taking false branch
29
Taking false branch
48
Taking false branch
839 Tag
10.2
'Tag' is not equal to DW_TAG_structure_type
28.2
'Tag' is not equal to DW_TAG_structure_type
47.2
'Tag' is not equal to DW_TAG_structure_type
== dwarf::DW_TAG_structure_type || Tag
10.3
'Tag' is not equal to DW_TAG_union_type
28.3
'Tag' is not equal to DW_TAG_union_type
47.3
'Tag' is not equal to DW_TAG_union_type
== dwarf::DW_TAG_union_type)
840 addTemplateParams(Buffer, CTy->getTemplateParams());
841
842 // Add elements to structure type.
843 DINodeArray Elements = CTy->getElements();
844 for (const auto *Element : Elements) {
845 if (!Element)
12
Assuming 'Element' is non-null
13
Taking false branch
30
Assuming 'Element' is non-null
31
Taking false branch
49
Assuming 'Element' is non-null
50
Taking false branch
846 continue;
847 if (auto *SP
14.1
'SP' is null
32.1
'SP' is null
51.1
'SP' is null
= dyn_cast<DISubprogram>(Element))
14
Assuming 'Element' is not a 'DISubprogram'
15
Taking false branch
32
Assuming 'Element' is not a 'DISubprogram'
33
Taking false branch
51
Assuming 'Element' is not a 'DISubprogram'
52
Taking false branch
848 getOrCreateSubprogramDIE(SP);
849 else if (auto *DDTy
16.1
'DDTy' is null
34.1
'DDTy' is null
53.1
'DDTy' is non-null
= dyn_cast<DIDerivedType>(Element)) {
16
Assuming 'Element' is not a 'DIDerivedType'
17
Taking false branch
34
Assuming 'Element' is not a 'DIDerivedType'
35
Taking false branch
53
Assuming 'Element' is a 'DIDerivedType'
54
Taking true branch
850 if (DDTy->getTag() == dwarf::DW_TAG_friend) {
55
Assuming the condition is false
56
Taking false branch
851 DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
852 addType(ElemDie, DDTy->getBaseType(), dwarf::DW_AT_friend);
853 } else if (DDTy->isStaticMember()) {
57
Assuming the condition is false
58
Taking false branch
854 getOrCreateStaticMemberDIE(DDTy);
855 } else if (Tag
58.1
'Tag' is equal to DW_TAG_variant_part
== dwarf::DW_TAG_variant_part) {
59
Taking true branch
856 // When emitting a variant part, wrap each member in
857 // DW_TAG_variant.
858 DIE &Variant = createAndAddDIE(dwarf::DW_TAG_variant, Buffer);
859 if (const ConstantInt *CI
60.1
'CI' is non-null
=
61
Taking true branch
860 dyn_cast_or_null<ConstantInt>(DDTy->getDiscriminantValue())) {
60
Assuming the object is a 'ConstantInt'
861 if (DD->isUnsignedDIType(Discriminator->getBaseType()))
62
Called C++ object pointer is null
862 addUInt(Variant, dwarf::DW_AT_discr_value, None, CI->getZExtValue());
863 else
864 addSInt(Variant, dwarf::DW_AT_discr_value, None, CI->getSExtValue());
865 }
866 constructMemberDIE(Variant, DDTy);
867 } else {
868 constructMemberDIE(Buffer, DDTy);
869 }
870 } else if (auto *Property
18.1
'Property' is null
36.1
'Property' is null
= dyn_cast<DIObjCProperty>(Element)) {
18
Assuming 'Element' is not a 'DIObjCProperty'
19
Taking false branch
36
Assuming 'Element' is not a 'DIObjCProperty'
37
Taking false branch
871 DIE &ElemDie = createAndAddDIE(Property->getTag(), Buffer);
872 StringRef PropertyName = Property->getName();
873 addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
874 if (Property->getType())
875 addType(ElemDie, Property->getType());
876 addSourceLine(ElemDie, Property);
877 StringRef GetterName = Property->getGetterName();
878 if (!GetterName.empty())
879 addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
880 StringRef SetterName = Property->getSetterName();
881 if (!SetterName.empty())
882 addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
883 if (unsigned PropertyAttributes = Property->getAttributes())
884 addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
885 PropertyAttributes);
886 } else if (auto *Composite
20.1
'Composite' is non-null
38.1
'Composite' is non-null
= dyn_cast<DICompositeType>(Element)) {
20
Assuming 'Element' is a 'DICompositeType'
21
Taking true branch
38
Assuming 'Element' is a 'DICompositeType'
39
Taking true branch
887 if (Composite->getTag() == dwarf::DW_TAG_variant_part) {
22
Assuming the condition is true
23
Taking true branch
40
Assuming the condition is true
41
Taking true branch
888 DIE &VariantPart = createAndAddDIE(Composite->getTag(), Buffer);
889 constructTypeDIE(VariantPart, Composite);
24
Calling 'DwarfUnit::constructTypeDIE'
42
Calling 'DwarfUnit::constructTypeDIE'
890 }
891 }
892 }
893
894 if (CTy->isAppleBlockExtension())
895 addFlag(Buffer, dwarf::DW_AT_APPLE_block);
896
897 if (CTy->getExportSymbols())
898 addFlag(Buffer, dwarf::DW_AT_export_symbols);
899
900 // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
901 // inside C++ composite types to point to the base class with the vtable.
902 // Rust uses DW_AT_containing_type to link a vtable to the type
903 // for which it was created.
904 if (auto *ContainingType = CTy->getVTableHolder())
905 addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
906 *getOrCreateTypeDIE(ContainingType));
907
908 if (CTy->isObjcClassComplete())
909 addFlag(Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
910
911 // Add the type's non-standard calling convention.
912 uint8_t CC = 0;
913 if (CTy->isTypePassByValue())
914 CC = dwarf::DW_CC_pass_by_value;
915 else if (CTy->isTypePassByReference())
916 CC = dwarf::DW_CC_pass_by_reference;
917 if (CC)
918 addUInt(Buffer, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1,
919 CC);
920 break;
921 }
922 default:
923 break;
924 }
925
926 // Add name if not anonymous or intermediate type.
927 if (!Name.empty())
928 addString(Buffer, dwarf::DW_AT_name, Name);
929
930 if (Tag == dwarf::DW_TAG_enumeration_type ||
931 Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
932 Tag == dwarf::DW_TAG_union_type) {
933 // Add size if non-zero (derived types might be zero-sized.)
934 // Ignore the size if it's a non-enum forward decl.
935 // TODO: Do we care about size for enum forward declarations?
936 if (Size &&
937 (!CTy->isForwardDecl() || Tag == dwarf::DW_TAG_enumeration_type))
938 addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
939 else if (!CTy->isForwardDecl())
940 // Add zero size if it is not a forward declaration.
941 addUInt(Buffer, dwarf::DW_AT_byte_size, None, 0);
942
943 // If we're a forward decl, say so.
944 if (CTy->isForwardDecl())
945 addFlag(Buffer, dwarf::DW_AT_declaration);
946
947 // Add source line info if available.
948 if (!CTy->isForwardDecl())
949 addSourceLine(Buffer, CTy);
950
951 // No harm in adding the runtime language to the declaration.
952 unsigned RLang = CTy->getRuntimeLang();
953 if (RLang)
954 addUInt(Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
955 RLang);
956
957 // Add align info if available.
958 if (uint32_t AlignInBytes = CTy->getAlignInBytes())
959 addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
960 AlignInBytes);
961 }
962}
963
964void DwarfUnit::constructTemplateTypeParameterDIE(
965 DIE &Buffer, const DITemplateTypeParameter *TP) {
966 DIE &ParamDIE =
967 createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
968 // Add the type if it exists, it could be void and therefore no type.
969 if (TP->getType())
970 addType(ParamDIE, TP->getType());
971 if (!TP->getName().empty())
972 addString(ParamDIE, dwarf::DW_AT_name, TP->getName());
973 if (TP->isDefault() && (DD->getDwarfVersion() >= 5))
974 addFlag(ParamDIE, dwarf::DW_AT_default_value);
975}
976
977void DwarfUnit::constructTemplateValueParameterDIE(
978 DIE &Buffer, const DITemplateValueParameter *VP) {
979 DIE &ParamDIE = createAndAddDIE(VP->getTag(), Buffer);
980
981 // Add the type if there is one, template template and template parameter
982 // packs will not have a type.
983 if (VP->getTag() == dwarf::DW_TAG_template_value_parameter)
984 addType(ParamDIE, VP->getType());
985 if (!VP->getName().empty())
986 addString(ParamDIE, dwarf::DW_AT_name, VP->getName());
987 if (VP->isDefault() && (DD->getDwarfVersion() >= 5))
988 addFlag(ParamDIE, dwarf::DW_AT_default_value);
989 if (Metadata *Val = VP->getValue()) {
990 if (ConstantInt *CI = mdconst::dyn_extract<ConstantInt>(Val))
991 addConstantValue(ParamDIE, CI, VP->getType());
992 else if (GlobalValue *GV = mdconst::dyn_extract<GlobalValue>(Val)) {
993 // We cannot describe the location of dllimport'd entities: the
994 // computation of their address requires loads from the IAT.
995 if (!GV->hasDLLImportStorageClass()) {
996 // For declaration non-type template parameters (such as global values
997 // and functions)
998 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
999 addOpAddress(*Loc, Asm->getSymbol(GV));
1000 // Emit DW_OP_stack_value to use the address as the immediate value of
1001 // the parameter, rather than a pointer to it.
1002 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
1003 addBlock(ParamDIE, dwarf::DW_AT_location, Loc);
1004 }
1005 } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_template_param) {
1006 assert(isa<MDString>(Val))((isa<MDString>(Val)) ? static_cast<void> (0) : __assert_fail
("isa<MDString>(Val)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1006, __PRETTY_FUNCTION__))
;
1007 addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
1008 cast<MDString>(Val)->getString());
1009 } else if (VP->getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
1010 addTemplateParams(ParamDIE, cast<MDTuple>(Val));
1011 }
1012 }
1013}
1014
1015DIE *DwarfUnit::getOrCreateNameSpace(const DINamespace *NS) {
1016 // Construct the context before querying for the existence of the DIE in case
1017 // such construction creates the DIE.
1018 DIE *ContextDIE = getOrCreateContextDIE(NS->getScope());
1019
1020 if (DIE *NDie = getDIE(NS))
1021 return NDie;
1022 DIE &NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
1023
1024 StringRef Name = NS->getName();
1025 if (!Name.empty())
1026 addString(NDie, dwarf::DW_AT_name, NS->getName());
1027 else
1028 Name = "(anonymous namespace)";
1029 DD->addAccelNamespace(*CUNode, Name, NDie);
1030 addGlobalName(Name, NDie, NS->getScope());
1031 if (NS->getExportSymbols())
1032 addFlag(NDie, dwarf::DW_AT_export_symbols);
1033 return &NDie;
1034}
1035
1036DIE *DwarfUnit::getOrCreateModule(const DIModule *M) {
1037 // Construct the context before querying for the existence of the DIE in case
1038 // such construction creates the DIE.
1039 DIE *ContextDIE = getOrCreateContextDIE(M->getScope());
1040
1041 if (DIE *MDie = getDIE(M))
1042 return MDie;
1043 DIE &MDie = createAndAddDIE(dwarf::DW_TAG_module, *ContextDIE, M);
1044
1045 if (!M->getName().empty()) {
1046 addString(MDie, dwarf::DW_AT_name, M->getName());
1047 addGlobalName(M->getName(), MDie, M->getScope());
1048 }
1049 if (!M->getConfigurationMacros().empty())
1050 addString(MDie, dwarf::DW_AT_LLVM_config_macros,
1051 M->getConfigurationMacros());
1052 if (!M->getIncludePath().empty())
1053 addString(MDie, dwarf::DW_AT_LLVM_include_path, M->getIncludePath());
1054 if (!M->getAPINotesFile().empty())
1055 addString(MDie, dwarf::DW_AT_LLVM_apinotes, M->getAPINotesFile());
1056 if (M->getFile())
1057 addUInt(MDie, dwarf::DW_AT_decl_file, None,
1058 getOrCreateSourceID(M->getFile()));
1059 if (M->getLineNo())
1060 addUInt(MDie, dwarf::DW_AT_decl_line, None, M->getLineNo());
1061
1062 return &MDie;
1063}
1064
1065DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal) {
1066 // Construct the context before querying for the existence of the DIE in case
1067 // such construction creates the DIE (as is the case for member function
1068 // declarations).
1069 DIE *ContextDIE =
1070 Minimal ? &getUnitDie() : getOrCreateContextDIE(SP->getScope());
1071
1072 if (DIE *SPDie = getDIE(SP))
1073 return SPDie;
1074
1075 if (auto *SPDecl = SP->getDeclaration()) {
1076 if (!Minimal) {
1077 // Add subprogram definitions to the CU die directly.
1078 ContextDIE = &getUnitDie();
1079 // Build the decl now to ensure it precedes the definition.
1080 getOrCreateSubprogramDIE(SPDecl);
1081 }
1082 }
1083
1084 // DW_TAG_inlined_subroutine may refer to this DIE.
1085 DIE &SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
1086
1087 // Stop here and fill this in later, depending on whether or not this
1088 // subprogram turns out to have inlined instances or not.
1089 if (SP->isDefinition())
1090 return &SPDie;
1091
1092 static_cast<DwarfUnit *>(SPDie.getUnit())
1093 ->applySubprogramAttributes(SP, SPDie);
1094 return &SPDie;
1095}
1096
1097bool DwarfUnit::applySubprogramDefinitionAttributes(const DISubprogram *SP,
1098 DIE &SPDie) {
1099 DIE *DeclDie = nullptr;
1100 StringRef DeclLinkageName;
1101 if (auto *SPDecl = SP->getDeclaration()) {
1102 DITypeRefArray DeclArgs, DefinitionArgs;
1103 DeclArgs = SPDecl->getType()->getTypeArray();
1104 DefinitionArgs = SP->getType()->getTypeArray();
1105
1106 if (DeclArgs.size() && DefinitionArgs.size())
1107 if (DefinitionArgs[0] != NULL__null && DeclArgs[0] != DefinitionArgs[0])
1108 addType(SPDie, DefinitionArgs[0]);
1109
1110 DeclDie = getDIE(SPDecl);
1111 assert(DeclDie && "This DIE should've already been constructed when the "((DeclDie && "This DIE should've already been constructed when the "
"definition DIE was created in " "getOrCreateSubprogramDIE")
? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1113, __PRETTY_FUNCTION__))
1112 "definition DIE was created in "((DeclDie && "This DIE should've already been constructed when the "
"definition DIE was created in " "getOrCreateSubprogramDIE")
? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1113, __PRETTY_FUNCTION__))
1113 "getOrCreateSubprogramDIE")((DeclDie && "This DIE should've already been constructed when the "
"definition DIE was created in " "getOrCreateSubprogramDIE")
? static_cast<void> (0) : __assert_fail ("DeclDie && \"This DIE should've already been constructed when the \" \"definition DIE was created in \" \"getOrCreateSubprogramDIE\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1113, __PRETTY_FUNCTION__))
;
1114 // Look at the Decl's linkage name only if we emitted it.
1115 if (DD->useAllLinkageNames())
1116 DeclLinkageName = SPDecl->getLinkageName();
1117 unsigned DeclID = getOrCreateSourceID(SPDecl->getFile());
1118 unsigned DefID = getOrCreateSourceID(SP->getFile());
1119 if (DeclID != DefID)
1120 addUInt(SPDie, dwarf::DW_AT_decl_file, None, DefID);
1121
1122 if (SP->getLine() != SPDecl->getLine())
1123 addUInt(SPDie, dwarf::DW_AT_decl_line, None, SP->getLine());
1124 }
1125
1126 // Add function template parameters.
1127 addTemplateParams(SPDie, SP->getTemplateParams());
1128
1129 // Add the linkage name if we have one and it isn't in the Decl.
1130 StringRef LinkageName = SP->getLinkageName();
1131 assert(((LinkageName.empty() || DeclLinkageName.empty()) ||((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
== DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1133, __PRETTY_FUNCTION__))
1132 LinkageName == DeclLinkageName) &&((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
== DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1133, __PRETTY_FUNCTION__))
1133 "decl has a linkage name and it is different")((((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName
== DeclLinkageName) && "decl has a linkage name and it is different"
) ? static_cast<void> (0) : __assert_fail ("((LinkageName.empty() || DeclLinkageName.empty()) || LinkageName == DeclLinkageName) && \"decl has a linkage name and it is different\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1133, __PRETTY_FUNCTION__))
;
1134 if (DeclLinkageName.empty() &&
1135 // Always emit it for abstract subprograms.
1136 (DD->useAllLinkageNames() || DU->getAbstractSPDies().lookup(SP)))
1137 addLinkageName(SPDie, LinkageName);
1138
1139 if (!DeclDie)
1140 return false;
1141
1142 // Refer to the function declaration where all the other attributes will be
1143 // found.
1144 addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie);
1145 return true;
1146}
1147
1148void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
1149 bool SkipSPAttributes) {
1150 // If -fdebug-info-for-profiling is enabled, need to emit the subprogram
1151 // and its source location.
1152 bool SkipSPSourceLocation = SkipSPAttributes &&
1153 !CUNode->getDebugInfoForProfiling();
1154 if (!SkipSPSourceLocation)
1155 if (applySubprogramDefinitionAttributes(SP, SPDie))
1156 return;
1157
1158 // Constructors and operators for anonymous aggregates do not have names.
1159 if (!SP->getName().empty())
1160 addString(SPDie, dwarf::DW_AT_name, SP->getName());
1161
1162 if (!SkipSPSourceLocation)
1163 addSourceLine(SPDie, SP);
1164
1165 // Skip the rest of the attributes under -gmlt to save space.
1166 if (SkipSPAttributes)
1167 return;
1168
1169 // Add the prototype if we have a prototype and we have a C like
1170 // language.
1171 uint16_t Language = getLanguage();
1172 if (SP->isPrototyped() &&
1173 (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
1174 Language == dwarf::DW_LANG_ObjC))
1175 addFlag(SPDie, dwarf::DW_AT_prototyped);
1176
1177 if (SP->isObjCDirect())
1178 addFlag(SPDie, dwarf::DW_AT_APPLE_objc_direct);
1179
1180 unsigned CC = 0;
1181 DITypeRefArray Args;
1182 if (const DISubroutineType *SPTy = SP->getType()) {
1183 Args = SPTy->getTypeArray();
1184 CC = SPTy->getCC();
1185 }
1186
1187 // Add a DW_AT_calling_convention if this has an explicit convention.
1188 if (CC && CC != dwarf::DW_CC_normal)
1189 addUInt(SPDie, dwarf::DW_AT_calling_convention, dwarf::DW_FORM_data1, CC);
1190
1191 // Add a return type. If this is a type like a C/C++ void type we don't add a
1192 // return type.
1193 if (Args.size())
1194 if (auto Ty = Args[0])
1195 addType(SPDie, Ty);
1196
1197 unsigned VK = SP->getVirtuality();
1198 if (VK) {
1199 addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
1200 if (SP->getVirtualIndex() != -1u) {
1201 DIELoc *Block = getDIELoc();
1202 addUInt(*Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1203 addUInt(*Block, dwarf::DW_FORM_udata, SP->getVirtualIndex());
1204 addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
1205 }
1206 ContainingTypeMap.insert(std::make_pair(&SPDie, SP->getContainingType()));
1207 }
1208
1209 if (!SP->isDefinition()) {
1210 addFlag(SPDie, dwarf::DW_AT_declaration);
1211
1212 // Add arguments. Do not add arguments for subprogram definition. They will
1213 // be handled while processing variables.
1214 constructSubprogramArguments(SPDie, Args);
1215 }
1216
1217 addThrownTypes(SPDie, SP->getThrownTypes());
1218
1219 if (SP->isArtificial())
1220 addFlag(SPDie, dwarf::DW_AT_artificial);
1221
1222 if (!SP->isLocalToUnit())
1223 addFlag(SPDie, dwarf::DW_AT_external);
1224
1225 if (DD->useAppleExtensionAttributes()) {
1226 if (SP->isOptimized())
1227 addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
1228
1229 if (unsigned isa = Asm->getISAEncoding())
1230 addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
1231 }
1232
1233 if (SP->isLValueReference())
1234 addFlag(SPDie, dwarf::DW_AT_reference);
1235
1236 if (SP->isRValueReference())
1237 addFlag(SPDie, dwarf::DW_AT_rvalue_reference);
1238
1239 if (SP->isNoReturn())
1240 addFlag(SPDie, dwarf::DW_AT_noreturn);
1241
1242 if (SP->isProtected())
1243 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1244 dwarf::DW_ACCESS_protected);
1245 else if (SP->isPrivate())
1246 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1247 dwarf::DW_ACCESS_private);
1248 else if (SP->isPublic())
1249 addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1250 dwarf::DW_ACCESS_public);
1251
1252 if (SP->isExplicit())
1253 addFlag(SPDie, dwarf::DW_AT_explicit);
1254
1255 if (SP->isMainSubprogram())
1256 addFlag(SPDie, dwarf::DW_AT_main_subprogram);
1257 if (SP->isPure())
1258 addFlag(SPDie, dwarf::DW_AT_pure);
1259 if (SP->isElemental())
1260 addFlag(SPDie, dwarf::DW_AT_elemental);
1261 if (SP->isRecursive())
1262 addFlag(SPDie, dwarf::DW_AT_recursive);
1263
1264 if (DD->getDwarfVersion() >= 5 && SP->isDeleted())
1265 addFlag(SPDie, dwarf::DW_AT_deleted);
1266}
1267
1268void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,
1269 DIE *IndexTy) {
1270 DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
1271 addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);
1272
1273 // The LowerBound value defines the lower bounds which is typically zero for
1274 // C/C++. The Count value is the number of elements. Values are 64 bit. If
1275 // Count == -1 then the array is unbounded and we do not emit
1276 // DW_AT_lower_bound and DW_AT_count attributes.
1277 int64_t DefaultLowerBound = getDefaultLowerBound();
1278 int64_t Count = -1;
1279 if (auto *CI = SR->getCount().dyn_cast<ConstantInt*>())
1280 Count = CI->getSExtValue();
1281
1282 auto AddBoundTypeEntry = [&](dwarf::Attribute Attr,
1283 DISubrange::BoundType Bound) -> void {
1284 if (auto *BV = Bound.dyn_cast<DIVariable *>()) {
1285 if (auto *VarDIE = getDIE(BV))
1286 addDIEEntry(DW_Subrange, Attr, *VarDIE);
1287 } else if (auto *BE = Bound.dyn_cast<DIExpression *>()) {
1288 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1289 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1290 DwarfExpr.setMemoryLocationKind();
1291 DwarfExpr.addExpression(BE);
1292 addBlock(DW_Subrange, Attr, DwarfExpr.finalize());
1293 } else if (auto *BI = Bound.dyn_cast<ConstantInt *>()) {
1294 if (Attr != dwarf::DW_AT_lower_bound || DefaultLowerBound == -1 ||
1295 BI->getSExtValue() != DefaultLowerBound)
1296 addSInt(DW_Subrange, Attr, dwarf::DW_FORM_sdata, BI->getSExtValue());
1297 }
1298 };
1299
1300 AddBoundTypeEntry(dwarf::DW_AT_lower_bound, SR->getLowerBound());
1301
1302 if (auto *CV = SR->getCount().dyn_cast<DIVariable*>()) {
1303 if (auto *CountVarDIE = getDIE(CV))
1304 addDIEEntry(DW_Subrange, dwarf::DW_AT_count, *CountVarDIE);
1305 } else if (Count != -1)
1306 addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count);
1307
1308 AddBoundTypeEntry(dwarf::DW_AT_upper_bound, SR->getUpperBound());
1309
1310 AddBoundTypeEntry(dwarf::DW_AT_byte_stride, SR->getStride());
1311}
1312
1313void DwarfUnit::constructGenericSubrangeDIE(DIE &Buffer,
1314 const DIGenericSubrange *GSR,
1315 DIE *IndexTy) {
1316 DIE &DwGenericSubrange =
1317 createAndAddDIE(dwarf::DW_TAG_generic_subrange, Buffer);
1318 addDIEEntry(DwGenericSubrange, dwarf::DW_AT_type, *IndexTy);
1319
1320 int64_t DefaultLowerBound = getDefaultLowerBound();
1321
1322 auto AddBoundTypeEntry = [&](dwarf::Attribute Attr,
1323 DIGenericSubrange::BoundType Bound) -> void {
1324 if (auto *BV = Bound.dyn_cast<DIVariable *>()) {
1325 if (auto *VarDIE = getDIE(BV))
1326 addDIEEntry(DwGenericSubrange, Attr, *VarDIE);
1327 } else if (auto *BE = Bound.dyn_cast<DIExpression *>()) {
1328 if (BE->isSignedConstant()) {
1329 if (Attr != dwarf::DW_AT_lower_bound || DefaultLowerBound == -1 ||
1330 static_cast<int64_t>(BE->getElement(1)) != DefaultLowerBound)
1331 addSInt(DwGenericSubrange, Attr, dwarf::DW_FORM_sdata,
1332 BE->getElement(1));
1333 } else {
1334 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1335 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1336 DwarfExpr.setMemoryLocationKind();
1337 DwarfExpr.addExpression(BE);
1338 addBlock(DwGenericSubrange, Attr, DwarfExpr.finalize());
1339 }
1340 }
1341 };
1342
1343 AddBoundTypeEntry(dwarf::DW_AT_lower_bound, GSR->getLowerBound());
1344 AddBoundTypeEntry(dwarf::DW_AT_count, GSR->getCount());
1345 AddBoundTypeEntry(dwarf::DW_AT_upper_bound, GSR->getUpperBound());
1346 AddBoundTypeEntry(dwarf::DW_AT_byte_stride, GSR->getStride());
1347}
1348
1349DIE *DwarfUnit::getIndexTyDie() {
1350 if (IndexTyDie)
1351 return IndexTyDie;
1352 // Construct an integer type to use for indexes.
1353 IndexTyDie = &createAndAddDIE(dwarf::DW_TAG_base_type, getUnitDie());
1354 StringRef Name = "__ARRAY_SIZE_TYPE__";
1355 addString(*IndexTyDie, dwarf::DW_AT_name, Name);
1356 addUInt(*IndexTyDie, dwarf::DW_AT_byte_size, None, sizeof(int64_t));
1357 addUInt(*IndexTyDie, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1358 dwarf::DW_ATE_unsigned);
1359 DD->addAccelType(*CUNode, Name, *IndexTyDie, /*Flags*/ 0);
1360 return IndexTyDie;
1361}
1362
1363/// Returns true if the vector's size differs from the sum of sizes of elements
1364/// the user specified. This can occur if the vector has been rounded up to
1365/// fit memory alignment constraints.
1366static bool hasVectorBeenPadded(const DICompositeType *CTy) {
1367 assert(CTy && CTy->isVector() && "Composite type is not a vector")((CTy && CTy->isVector() && "Composite type is not a vector"
) ? static_cast<void> (0) : __assert_fail ("CTy && CTy->isVector() && \"Composite type is not a vector\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1367, __PRETTY_FUNCTION__))
;
1368 const uint64_t ActualSize = CTy->getSizeInBits();
1369
1370 // Obtain the size of each element in the vector.
1371 DIType *BaseTy = CTy->getBaseType();
1372 assert(BaseTy && "Unknown vector element type.")((BaseTy && "Unknown vector element type.") ? static_cast
<void> (0) : __assert_fail ("BaseTy && \"Unknown vector element type.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1372, __PRETTY_FUNCTION__))
;
1373 const uint64_t ElementSize = BaseTy->getSizeInBits();
1374
1375 // Locate the number of elements in the vector.
1376 const DINodeArray Elements = CTy->getElements();
1377 assert(Elements.size() == 1 &&((Elements.size() == 1 && Elements[0]->getTag() ==
dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1379, __PRETTY_FUNCTION__))
1378 Elements[0]->getTag() == dwarf::DW_TAG_subrange_type &&((Elements.size() == 1 && Elements[0]->getTag() ==
dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1379, __PRETTY_FUNCTION__))
1379 "Invalid vector element array, expected one element of type subrange")((Elements.size() == 1 && Elements[0]->getTag() ==
dwarf::DW_TAG_subrange_type && "Invalid vector element array, expected one element of type subrange"
) ? static_cast<void> (0) : __assert_fail ("Elements.size() == 1 && Elements[0]->getTag() == dwarf::DW_TAG_subrange_type && \"Invalid vector element array, expected one element of type subrange\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1379, __PRETTY_FUNCTION__))
;
1380 const auto Subrange = cast<DISubrange>(Elements[0]);
1381 const auto NumVecElements =
1382 Subrange->getCount()
1383 ? Subrange->getCount().get<ConstantInt *>()->getSExtValue()
1384 : 0;
1385
1386 // Ensure we found the element count and that the actual size is wide
1387 // enough to contain the requested size.
1388 assert(ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size")((ActualSize >= (NumVecElements * ElementSize) && "Invalid vector size"
) ? static_cast<void> (0) : __assert_fail ("ActualSize >= (NumVecElements * ElementSize) && \"Invalid vector size\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1388, __PRETTY_FUNCTION__))
;
1389 return ActualSize != (NumVecElements * ElementSize);
1390}
1391
1392void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1393 if (CTy->isVector()) {
1394 addFlag(Buffer, dwarf::DW_AT_GNU_vector);
1395 if (hasVectorBeenPadded(CTy))
1396 addUInt(Buffer, dwarf::DW_AT_byte_size, None,
1397 CTy->getSizeInBits() / CHAR_BIT8);
1398 }
1399
1400 if (DIVariable *Var = CTy->getDataLocation()) {
1401 if (auto *VarDIE = getDIE(Var))
1402 addDIEEntry(Buffer, dwarf::DW_AT_data_location, *VarDIE);
1403 } else if (DIExpression *Expr = CTy->getDataLocationExp()) {
1404 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1405 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1406 DwarfExpr.setMemoryLocationKind();
1407 DwarfExpr.addExpression(Expr);
1408 addBlock(Buffer, dwarf::DW_AT_data_location, DwarfExpr.finalize());
1409 }
1410
1411 if (DIVariable *Var = CTy->getAssociated()) {
1412 if (auto *VarDIE = getDIE(Var))
1413 addDIEEntry(Buffer, dwarf::DW_AT_associated, *VarDIE);
1414 } else if (DIExpression *Expr = CTy->getAssociatedExp()) {
1415 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1416 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1417 DwarfExpr.setMemoryLocationKind();
1418 DwarfExpr.addExpression(Expr);
1419 addBlock(Buffer, dwarf::DW_AT_associated, DwarfExpr.finalize());
1420 }
1421
1422 if (DIVariable *Var = CTy->getAllocated()) {
1423 if (auto *VarDIE = getDIE(Var))
1424 addDIEEntry(Buffer, dwarf::DW_AT_allocated, *VarDIE);
1425 } else if (DIExpression *Expr = CTy->getAllocatedExp()) {
1426 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1427 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1428 DwarfExpr.setMemoryLocationKind();
1429 DwarfExpr.addExpression(Expr);
1430 addBlock(Buffer, dwarf::DW_AT_allocated, DwarfExpr.finalize());
1431 }
1432
1433 if (auto *RankConst = CTy->getRankConst()) {
1434 addSInt(Buffer, dwarf::DW_AT_rank, dwarf::DW_FORM_sdata,
1435 RankConst->getSExtValue());
1436 } else if (auto *RankExpr = CTy->getRankExp()) {
1437 DIELoc *Loc = new (DIEValueAllocator) DIELoc;
1438 DIEDwarfExpression DwarfExpr(*Asm, getCU(), *Loc);
1439 DwarfExpr.setMemoryLocationKind();
1440 DwarfExpr.addExpression(RankExpr);
1441 addBlock(Buffer, dwarf::DW_AT_rank, DwarfExpr.finalize());
1442 }
1443
1444 // Emit the element type.
1445 addType(Buffer, CTy->getBaseType());
1446
1447 // Get an anonymous type for index type.
1448 // FIXME: This type should be passed down from the front end
1449 // as different languages may have different sizes for indexes.
1450 DIE *IdxTy = getIndexTyDie();
1451
1452 // Add subranges to array type.
1453 DINodeArray Elements = CTy->getElements();
1454 for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1455 // FIXME: Should this really be such a loose cast?
1456 if (auto *Element = dyn_cast_or_null<DINode>(Elements[i])) {
1457 if (Element->getTag() == dwarf::DW_TAG_subrange_type)
1458 constructSubrangeDIE(Buffer, cast<DISubrange>(Element), IdxTy);
1459 else if (Element->getTag() == dwarf::DW_TAG_generic_subrange)
1460 constructGenericSubrangeDIE(Buffer, cast<DIGenericSubrange>(Element),
1461 IdxTy);
1462 }
1463 }
1464}
1465
1466void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
1467 const DIType *DTy = CTy->getBaseType();
1468 bool IsUnsigned = DTy && DD->isUnsignedDIType(DTy);
1469 if (DTy) {
1470 if (DD->getDwarfVersion() >= 3)
1471 addType(Buffer, DTy);
1472 if (DD->getDwarfVersion() >= 4 && (CTy->getFlags() & DINode::FlagEnumClass))
1473 addFlag(Buffer, dwarf::DW_AT_enum_class);
1474 }
1475
1476 auto *Context = CTy->getScope();
1477 bool IndexEnumerators = !Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
1478 isa<DINamespace>(Context) || isa<DICommonBlock>(Context);
1479 DINodeArray Elements = CTy->getElements();
1480
1481 // Add enumerators to enumeration type.
1482 for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
1483 auto *Enum = dyn_cast_or_null<DIEnumerator>(Elements[i]);
1484 if (Enum) {
1485 DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
1486 StringRef Name = Enum->getName();
1487 addString(Enumerator, dwarf::DW_AT_name, Name);
1488 addConstantValue(Enumerator, Enum->getValue(), IsUnsigned);
1489 if (IndexEnumerators)
1490 addGlobalName(Name, Enumerator, Context);
1491 }
1492 }
1493}
1494
1495void DwarfUnit::constructContainingTypeDIEs() {
1496 for (auto CI = ContainingTypeMap.begin(), CE = ContainingTypeMap.end();
1497 CI != CE; ++CI) {
1498 DIE &SPDie = *CI->first;
1499 const DINode *D = CI->second;
1500 if (!D)
1501 continue;
1502 DIE *NDie = getDIE(D);
1503 if (!NDie)
1504 continue;
1505 addDIEEntry(SPDie, dwarf::DW_AT_containing_type, *NDie);
1506 }
1507}
1508
1509DIE &DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
1510 DIE &MemberDie = createAndAddDIE(DT->getTag(), Buffer);
1511 StringRef Name = DT->getName();
1512 if (!Name.empty())
1513 addString(MemberDie, dwarf::DW_AT_name, Name);
1514
1515 if (DIType *Resolved = DT->getBaseType())
1516 addType(MemberDie, Resolved);
1517
1518 addSourceLine(MemberDie, DT);
1519
1520 if (DT->getTag() == dwarf::DW_TAG_inheritance && DT->isVirtual()) {
1521
1522 // For C++, virtual base classes are not at fixed offset. Use following
1523 // expression to extract appropriate offset from vtable.
1524 // BaseAddr = ObAddr + *((*ObAddr) - Offset)
1525
1526 DIELoc *VBaseLocationDie = new (DIEValueAllocator) DIELoc;
1527 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
1528 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1529 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
1530 addUInt(*VBaseLocationDie, dwarf::DW_FORM_udata, DT->getOffsetInBits());
1531 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
1532 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
1533 addUInt(*VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
1534
1535 addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
1536 } else {
1537 uint64_t Size = DT->getSizeInBits();
1538 uint64_t FieldSize = DD->getBaseTypeSize(DT);
1539 uint32_t AlignInBytes = DT->getAlignInBytes();
1540 uint64_t OffsetInBytes;
1541
1542 bool IsBitfield = FieldSize && Size != FieldSize;
1543 if (IsBitfield) {
1544 // Handle bitfield, assume bytes are 8 bits.
1545 if (DD->useDWARF2Bitfields())
1546 addUInt(MemberDie, dwarf::DW_AT_byte_size, None, FieldSize/8);
1547 addUInt(MemberDie, dwarf::DW_AT_bit_size, None, Size);
1548
1549 uint64_t Offset = DT->getOffsetInBits();
1550 // We can't use DT->getAlignInBits() here: AlignInBits for member type
1551 // is non-zero if and only if alignment was forced (e.g. _Alignas()),
1552 // which can't be done with bitfields. Thus we use FieldSize here.
1553 uint32_t AlignInBits = FieldSize;
1554 uint32_t AlignMask = ~(AlignInBits - 1);
1555 // The bits from the start of the storage unit to the start of the field.
1556 uint64_t StartBitOffset = Offset - (Offset & AlignMask);
1557 // The byte offset of the field's aligned storage unit inside the struct.
1558 OffsetInBytes = (Offset - StartBitOffset) / 8;
1559
1560 if (DD->useDWARF2Bitfields()) {
1561 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1562 uint64_t FieldOffset = (HiMark - FieldSize);
1563 Offset -= FieldOffset;
1564
1565 // Maybe we need to work from the other end.
1566 if (Asm->getDataLayout().isLittleEndian())
1567 Offset = FieldSize - (Offset + Size);
1568
1569 addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
1570 OffsetInBytes = FieldOffset >> 3;
1571 } else {
1572 addUInt(MemberDie, dwarf::DW_AT_data_bit_offset, None, Offset);
1573 }
1574 } else {
1575 // This is not a bitfield.
1576 OffsetInBytes = DT->getOffsetInBits() / 8;
1577 if (AlignInBytes)
1578 addUInt(MemberDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1579 AlignInBytes);
1580 }
1581
1582 if (DD->getDwarfVersion() <= 2) {
1583 DIELoc *MemLocationDie = new (DIEValueAllocator) DIELoc;
1584 addUInt(*MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1585 addUInt(*MemLocationDie, dwarf::DW_FORM_udata, OffsetInBytes);
1586 addBlock(MemberDie, dwarf::DW_AT_data_member_location, MemLocationDie);
1587 } else if (!IsBitfield || DD->useDWARF2Bitfields())
1588 addUInt(MemberDie, dwarf::DW_AT_data_member_location, None,
1589 OffsetInBytes);
1590 }
1591
1592 if (DT->isProtected())
1593 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1594 dwarf::DW_ACCESS_protected);
1595 else if (DT->isPrivate())
1596 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1597 dwarf::DW_ACCESS_private);
1598 // Otherwise C++ member and base classes are considered public.
1599 else if (DT->isPublic())
1600 addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1601 dwarf::DW_ACCESS_public);
1602 if (DT->isVirtual())
1603 addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
1604 dwarf::DW_VIRTUALITY_virtual);
1605
1606 // Objective-C properties.
1607 if (DINode *PNode = DT->getObjCProperty())
1608 if (DIE *PDie = getDIE(PNode))
1609 MemberDie.addValue(DIEValueAllocator, dwarf::DW_AT_APPLE_property,
1610 dwarf::DW_FORM_ref4, DIEEntry(*PDie));
1611
1612 if (DT->isArtificial())
1613 addFlag(MemberDie, dwarf::DW_AT_artificial);
1614
1615 return MemberDie;
1616}
1617
1618DIE *DwarfUnit::getOrCreateStaticMemberDIE(const DIDerivedType *DT) {
1619 if (!DT)
1620 return nullptr;
1621
1622 // Construct the context before querying for the existence of the DIE in case
1623 // such construction creates the DIE.
1624 DIE *ContextDIE = getOrCreateContextDIE(DT->getScope());
1625 assert(dwarf::isType(ContextDIE->getTag()) &&((dwarf::isType(ContextDIE->getTag()) && "Static member should belong to a type."
) ? static_cast<void> (0) : __assert_fail ("dwarf::isType(ContextDIE->getTag()) && \"Static member should belong to a type.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1626, __PRETTY_FUNCTION__))
1626 "Static member should belong to a type.")((dwarf::isType(ContextDIE->getTag()) && "Static member should belong to a type."
) ? static_cast<void> (0) : __assert_fail ("dwarf::isType(ContextDIE->getTag()) && \"Static member should belong to a type.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1626, __PRETTY_FUNCTION__))
;
1627
1628 if (DIE *StaticMemberDIE = getDIE(DT))
1629 return StaticMemberDIE;
1630
1631 DIE &StaticMemberDIE = createAndAddDIE(DT->getTag(), *ContextDIE, DT);
1632
1633 const DIType *Ty = DT->getBaseType();
1634
1635 addString(StaticMemberDIE, dwarf::DW_AT_name, DT->getName());
1636 addType(StaticMemberDIE, Ty);
1637 addSourceLine(StaticMemberDIE, DT);
1638 addFlag(StaticMemberDIE, dwarf::DW_AT_external);
1639 addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
1640
1641 // FIXME: We could omit private if the parent is a class_type, and
1642 // public if the parent is something else.
1643 if (DT->isProtected())
1644 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1645 dwarf::DW_ACCESS_protected);
1646 else if (DT->isPrivate())
1647 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1648 dwarf::DW_ACCESS_private);
1649 else if (DT->isPublic())
1650 addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
1651 dwarf::DW_ACCESS_public);
1652
1653 if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT->getConstant()))
1654 addConstantValue(StaticMemberDIE, CI, Ty);
1655 if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT->getConstant()))
1656 addConstantFPValue(StaticMemberDIE, CFP);
1657
1658 if (uint32_t AlignInBytes = DT->getAlignInBytes())
1659 addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
1660 AlignInBytes);
1661
1662 return &StaticMemberDIE;
1663}
1664
1665void DwarfUnit::emitCommonHeader(bool UseOffsets, dwarf::UnitType UT) {
1666 // Emit size of content not including length itself
1667 if (!DD->useSectionsAsReferences()) {
1668 StringRef Prefix = isDwoUnit() ? "debug_info_dwo_" : "debug_info_";
1669 MCSymbol *BeginLabel = Asm->createTempSymbol(Prefix + "start");
1670 EndLabel = Asm->createTempSymbol(Prefix + "end");
1671 Asm->emitDwarfUnitLength(EndLabel, BeginLabel, "Length of Unit");
1672 Asm->OutStreamer->emitLabel(BeginLabel);
1673 } else
1674 Asm->emitDwarfUnitLength(getHeaderSize() + getUnitDie().getSize(),
1675 "Length of Unit");
1676
1677 Asm->OutStreamer->AddComment("DWARF version number");
1678 unsigned Version = DD->getDwarfVersion();
1679 Asm->emitInt16(Version);
1680
1681 // DWARF v5 reorders the address size and adds a unit type.
1682 if (Version >= 5) {
1683 Asm->OutStreamer->AddComment("DWARF Unit Type");
1684 Asm->emitInt8(UT);
1685 Asm->OutStreamer->AddComment("Address Size (in bytes)");
1686 Asm->emitInt8(Asm->MAI->getCodePointerSize());
1687 }
1688
1689 // We share one abbreviations table across all units so it's always at the
1690 // start of the section. Use a relocatable offset where needed to ensure
1691 // linking doesn't invalidate that offset.
1692 Asm->OutStreamer->AddComment("Offset Into Abbrev. Section");
1693 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1694 if (UseOffsets)
1695 Asm->emitDwarfLengthOrOffset(0);
1696 else
1697 Asm->emitDwarfSymbolReference(
1698 TLOF.getDwarfAbbrevSection()->getBeginSymbol(), false);
1699
1700 if (Version <= 4) {
1701 Asm->OutStreamer->AddComment("Address Size (in bytes)");
1702 Asm->emitInt8(Asm->MAI->getCodePointerSize());
1703 }
1704}
1705
1706void DwarfTypeUnit::emitHeader(bool UseOffsets) {
1707 DwarfUnit::emitCommonHeader(UseOffsets,
1708 DD->useSplitDwarf() ? dwarf::DW_UT_split_type
1709 : dwarf::DW_UT_type);
1710 Asm->OutStreamer->AddComment("Type Signature");
1711 Asm->OutStreamer->emitIntValue(TypeSignature, sizeof(TypeSignature));
1712 Asm->OutStreamer->AddComment("Type DIE Offset");
1713 // In a skeleton type unit there is no type DIE so emit a zero offset.
1714 Asm->emitDwarfLengthOrOffset(Ty ? Ty->getOffset() : 0);
1715}
1716
1717DIE::value_iterator
1718DwarfUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
1719 const MCSymbol *Hi, const MCSymbol *Lo) {
1720 return Die.addValue(DIEValueAllocator, Attribute,
1721 DD->getDwarfSectionOffsetForm(),
1722 new (DIEValueAllocator) DIEDelta(Hi, Lo));
1723}
1724
1725DIE::value_iterator
1726DwarfUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
1727 const MCSymbol *Label, const MCSymbol *Sec) {
1728 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
1729 return addLabel(Die, Attribute, DD->getDwarfSectionOffsetForm(), Label);
1730 return addSectionDelta(Die, Attribute, Label, Sec);
1731}
1732
1733bool DwarfTypeUnit::isDwoUnit() const {
1734 // Since there are no skeleton type units, all type units are dwo type units
1735 // when split DWARF is being used.
1736 return DD->useSplitDwarf();
1737}
1738
1739void DwarfTypeUnit::addGlobalName(StringRef Name, const DIE &Die,
1740 const DIScope *Context) {
1741 getCU().addGlobalNameForTypeUnit(Name, Context);
1742}
1743
1744void DwarfTypeUnit::addGlobalType(const DIType *Ty, const DIE &Die,
1745 const DIScope *Context) {
1746 getCU().addGlobalTypeUnitType(Ty, Context);
1747}
1748
1749const MCSymbol *DwarfUnit::getCrossSectionRelativeBaseAddress() const {
1750 if (!Asm->MAI->doesDwarfUseRelocationsAcrossSections())
1751 return nullptr;
1752 if (isDwoUnit())
1753 return nullptr;
1754 return getSection()->getBeginSymbol();
1755}
1756
1757void DwarfUnit::addStringOffsetsStart() {
1758 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1759 addSectionLabel(getUnitDie(), dwarf::DW_AT_str_offsets_base,
1760 DU->getStringOffsetsStartSym(),
1761 TLOF.getDwarfStrOffSection()->getBeginSymbol());
1762}
1763
1764void DwarfUnit::addRnglistsBase() {
1765 assert(DD->getDwarfVersion() >= 5 &&((DD->getDwarfVersion() >= 5 && "DW_AT_rnglists_base requires DWARF version 5 or later"
) ? static_cast<void> (0) : __assert_fail ("DD->getDwarfVersion() >= 5 && \"DW_AT_rnglists_base requires DWARF version 5 or later\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1766, __PRETTY_FUNCTION__))
1766 "DW_AT_rnglists_base requires DWARF version 5 or later")((DD->getDwarfVersion() >= 5 && "DW_AT_rnglists_base requires DWARF version 5 or later"
) ? static_cast<void> (0) : __assert_fail ("DD->getDwarfVersion() >= 5 && \"DW_AT_rnglists_base requires DWARF version 5 or later\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp"
, 1766, __PRETTY_FUNCTION__))
;
1767 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
1768 addSectionLabel(getUnitDie(), dwarf::DW_AT_rnglists_base,
1769 DU->getRnglistsTableBaseSym(),
1770 TLOF.getDwarfRnglistsSection()->getBeginSymbol());
1771}
1772
1773void DwarfTypeUnit::finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) {
1774 addFlag(D, dwarf::DW_AT_declaration);
1775 StringRef Name = CTy->getName();
1776 if (!Name.empty())
1
Assuming the condition is false
2
Taking false branch
1777 addString(D, dwarf::DW_AT_name, Name);
1778 getCU().createTypeDIE(CTy);
3
Calling 'DwarfUnit::createTypeDIE'
1779}