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[ARM] Generate 8.1-m CSINC, CSNEG and CSINV instructions.
[llvm-core.git] / lib / DebugInfo / DWARF / DWARFFormValue.cpp
blob26090638b34cda9c5be066ca2dea6d25540e374b
1 //===- DWARFFormValue.cpp -------------------------------------------------===//
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 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
10 #include "llvm/ADT/ArrayRef.h"
11 #include "llvm/ADT/None.h"
12 #include "llvm/ADT/Optional.h"
13 #include "llvm/ADT/StringRef.h"
14 #include "llvm/BinaryFormat/Dwarf.h"
15 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
16 #include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
17 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/WithColor.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include <cinttypes>
23 #include <cstdint>
24 #include <limits>
25
26 using namespace llvm;
27 using namespace dwarf;
28
29 static const DWARFFormValue::FormClass DWARF5FormClasses[] = {
30 DWARFFormValue::FC_Unknown, // 0x0
31 DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr
32 DWARFFormValue::FC_Unknown, // 0x02 unused
33 DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2
34 DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4
35 DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2
36 // --- These can be FC_SectionOffset in DWARF3 and below:
37 DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4
38 DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8
39 // ---
40 DWARFFormValue::FC_String, // 0x08 DW_FORM_string
41 DWARFFormValue::FC_Block, // 0x09 DW_FORM_block
42 DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1
43 DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1
44 DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag
45 DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata
46 DWARFFormValue::FC_String, // 0x0e DW_FORM_strp
47 DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata
48 DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr
49 DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1
50 DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2
51 DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4
52 DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8
53 DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata
54 DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect
55 DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset
56 DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc
57 DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present
58 DWARFFormValue::FC_String, // 0x1a DW_FORM_strx
59 DWARFFormValue::FC_Address, // 0x1b DW_FORM_addrx
60 DWARFFormValue::FC_Reference, // 0x1c DW_FORM_ref_sup4
61 DWARFFormValue::FC_String, // 0x1d DW_FORM_strp_sup
62 DWARFFormValue::FC_Constant, // 0x1e DW_FORM_data16
63 DWARFFormValue::FC_String, // 0x1f DW_FORM_line_strp
64 DWARFFormValue::FC_Reference, // 0x20 DW_FORM_ref_sig8
65 DWARFFormValue::FC_Constant, // 0x21 DW_FORM_implicit_const
66 DWARFFormValue::FC_SectionOffset, // 0x22 DW_FORM_loclistx
67 DWARFFormValue::FC_SectionOffset, // 0x23 DW_FORM_rnglistx
68 DWARFFormValue::FC_Reference, // 0x24 DW_FORM_ref_sup8
69 DWARFFormValue::FC_String, // 0x25 DW_FORM_strx1
70 DWARFFormValue::FC_String, // 0x26 DW_FORM_strx2
71 DWARFFormValue::FC_String, // 0x27 DW_FORM_strx3
72 DWARFFormValue::FC_String, // 0x28 DW_FORM_strx4
73 DWARFFormValue::FC_Address, // 0x29 DW_FORM_addrx1
74 DWARFFormValue::FC_Address, // 0x2a DW_FORM_addrx2
75 DWARFFormValue::FC_Address, // 0x2b DW_FORM_addrx3
76 DWARFFormValue::FC_Address, // 0x2c DW_FORM_addrx4
77
78 };
79
80 DWARFFormValue DWARFFormValue::createFromSValue(dwarf::Form F, int64_t V) {
81 return DWARFFormValue(F, ValueType(V));
82 }
83
84 DWARFFormValue DWARFFormValue::createFromUValue(dwarf::Form F, uint64_t V) {
85 return DWARFFormValue(F, ValueType(V));
86 }
87
88 DWARFFormValue DWARFFormValue::createFromPValue(dwarf::Form F, const char *V) {
89 return DWARFFormValue(F, ValueType(V));
90 }
91
92 DWARFFormValue DWARFFormValue::createFromBlockValue(dwarf::Form F,
93 ArrayRef<uint8_t> D) {
94 ValueType V;
95 V.uval = D.size();
96 V.data = D.data();
97 return DWARFFormValue(F, V);
98 }
99
100 DWARFFormValue DWARFFormValue::createFromUnit(dwarf::Form F, const DWARFUnit *U,
101 uint64_t *OffsetPtr) {
102 DWARFFormValue FormValue(F);
103 FormValue.extractValue(U->getDebugInfoExtractor(), OffsetPtr,
104 U->getFormParams(), U);
105 return FormValue;
106 }
107
108 bool DWARFFormValue::skipValue(dwarf::Form Form, DataExtractor DebugInfoData,
109 uint64_t *OffsetPtr,
110 const dwarf::FormParams Params) {
111 bool Indirect = false;
112 do {
113 switch (Form) {
114 // Blocks of inlined data that have a length field and the data bytes
115 // inlined in the .debug_info.
116 case DW_FORM_exprloc:
117 case DW_FORM_block: {
118 uint64_t size = DebugInfoData.getULEB128(OffsetPtr);
119 *OffsetPtr += size;
120 return true;
121 }
122 case DW_FORM_block1: {
123 uint8_t size = DebugInfoData.getU8(OffsetPtr);
124 *OffsetPtr += size;
125 return true;
126 }
127 case DW_FORM_block2: {
128 uint16_t size = DebugInfoData.getU16(OffsetPtr);
129 *OffsetPtr += size;
130 return true;
131 }
132 case DW_FORM_block4: {
133 uint32_t size = DebugInfoData.getU32(OffsetPtr);
134 *OffsetPtr += size;
135 return true;
136 }
137
138 // Inlined NULL terminated C-strings.
139 case DW_FORM_string:
140 DebugInfoData.getCStr(OffsetPtr);
141 return true;
142
143 case DW_FORM_addr:
144 case DW_FORM_ref_addr:
145 case DW_FORM_flag_present:
146 case DW_FORM_data1:
147 case DW_FORM_data2:
148 case DW_FORM_data4:
149 case DW_FORM_data8:
150 case DW_FORM_data16:
151 case DW_FORM_flag:
152 case DW_FORM_ref1:
153 case DW_FORM_ref2:
154 case DW_FORM_ref4:
155 case DW_FORM_ref8:
156 case DW_FORM_ref_sig8:
157 case DW_FORM_ref_sup4:
158 case DW_FORM_ref_sup8:
159 case DW_FORM_strx1:
160 case DW_FORM_strx2:
161 case DW_FORM_strx4:
162 case DW_FORM_addrx1:
163 case DW_FORM_addrx2:
164 case DW_FORM_addrx4:
165 case DW_FORM_sec_offset:
166 case DW_FORM_strp:
167 case DW_FORM_strp_sup:
168 case DW_FORM_line_strp:
169 case DW_FORM_GNU_ref_alt:
170 case DW_FORM_GNU_strp_alt:
171 if (Optional<uint8_t> FixedSize =
172 dwarf::getFixedFormByteSize(Form, Params)) {
173 *OffsetPtr += *FixedSize;
174 return true;
175 }
176 return false;
177
178 // signed or unsigned LEB 128 values.
179 case DW_FORM_sdata:
180 DebugInfoData.getSLEB128(OffsetPtr);
181 return true;
182
183 case DW_FORM_udata:
184 case DW_FORM_ref_udata:
185 case DW_FORM_strx:
186 case DW_FORM_addrx:
187 case DW_FORM_loclistx:
188 case DW_FORM_rnglistx:
189 case DW_FORM_GNU_addr_index:
190 case DW_FORM_GNU_str_index:
191 DebugInfoData.getULEB128(OffsetPtr);
192 return true;
193
194 case DW_FORM_indirect:
195 Indirect = true;
196 Form = static_cast<dwarf::Form>(DebugInfoData.getULEB128(OffsetPtr));
197 break;
198
199 default:
200 return false;
201 }
202 } while (Indirect);
203 return true;
204 }
205
206 bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
207 // First, check DWARF5 form classes.
208 if (Form < makeArrayRef(DWARF5FormClasses).size() &&
209 DWARF5FormClasses[Form] == FC)
210 return true;
211 // Check more forms from extensions and proposals.
212 switch (Form) {
213 case DW_FORM_GNU_ref_alt:
214 return (FC == FC_Reference);
215 case DW_FORM_GNU_addr_index:
216 return (FC == FC_Address);
217 case DW_FORM_GNU_str_index:
218 case DW_FORM_GNU_strp_alt:
219 return (FC == FC_String);
220 default:
221 break;
222 }
223
224 if (FC == FC_SectionOffset) {
225 if (Form == DW_FORM_strp || Form == DW_FORM_line_strp)
226 return true;
227 // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section
228 // offset. If we don't have a DWARFUnit, default to the old behavior.
229 if (Form == DW_FORM_data4 || Form == DW_FORM_data8)
230 return !U || U->getVersion() <= 3;
231 }
232
233 return false;
234 }
235
236 bool DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
237 uint64_t *OffsetPtr, dwarf::FormParams FP,
238 const DWARFContext *Ctx,
239 const DWARFUnit *CU) {
240 if (!Ctx && CU)
241 Ctx = &CU->getContext();
242 C = Ctx;
243 U = CU;
244 bool Indirect = false;
245 bool IsBlock = false;
246 Value.data = nullptr;
247 // Read the value for the form into value and follow and DW_FORM_indirect
248 // instances we run into
249 do {
250 Indirect = false;
251 switch (Form) {
252 case DW_FORM_addr:
253 case DW_FORM_ref_addr: {
254 uint16_t Size =
255 (Form == DW_FORM_addr) ? FP.AddrSize : FP.getRefAddrByteSize();
256 Value.uval = Data.getRelocatedValue(Size, OffsetPtr, &Value.SectionIndex);
257 break;
258 }
259 case DW_FORM_exprloc:
260 case DW_FORM_block:
261 Value.uval = Data.getULEB128(OffsetPtr);
262 IsBlock = true;
263 break;
264 case DW_FORM_block1:
265 Value.uval = Data.getU8(OffsetPtr);
266 IsBlock = true;
267 break;
268 case DW_FORM_block2:
269 Value.uval = Data.getU16(OffsetPtr);
270 IsBlock = true;
271 break;
272 case DW_FORM_block4:
273 Value.uval = Data.getU32(OffsetPtr);
274 IsBlock = true;
275 break;
276 case DW_FORM_data1:
277 case DW_FORM_ref1:
278 case DW_FORM_flag:
279 case DW_FORM_strx1:
280 case DW_FORM_addrx1:
281 Value.uval = Data.getU8(OffsetPtr);
282 break;
283 case DW_FORM_data2:
284 case DW_FORM_ref2:
285 case DW_FORM_strx2:
286 case DW_FORM_addrx2:
287 Value.uval = Data.getU16(OffsetPtr);
288 break;
289 case DW_FORM_strx3:
290 Value.uval = Data.getU24(OffsetPtr);
291 break;
292 case DW_FORM_data4:
293 case DW_FORM_ref4:
294 case DW_FORM_ref_sup4:
295 case DW_FORM_strx4:
296 case DW_FORM_addrx4:
297 Value.uval = Data.getRelocatedValue(4, OffsetPtr);
298 break;
299 case DW_FORM_data8:
300 case DW_FORM_ref8:
301 case DW_FORM_ref_sup8:
302 Value.uval = Data.getRelocatedValue(8, OffsetPtr);
303 break;
304 case DW_FORM_data16:
305 // Treat this like a 16-byte block.
306 Value.uval = 16;
307 IsBlock = true;
308 break;
309 case DW_FORM_sdata:
310 Value.sval = Data.getSLEB128(OffsetPtr);
311 break;
312 case DW_FORM_udata:
313 case DW_FORM_ref_udata:
314 case DW_FORM_rnglistx:
315 Value.uval = Data.getULEB128(OffsetPtr);
316 break;
317 case DW_FORM_string:
318 Value.cstr = Data.getCStr(OffsetPtr);
319 break;
320 case DW_FORM_indirect:
321 Form = static_cast<dwarf::Form>(Data.getULEB128(OffsetPtr));
322 Indirect = true;
323 break;
324 case DW_FORM_strp:
325 case DW_FORM_sec_offset:
326 case DW_FORM_GNU_ref_alt:
327 case DW_FORM_GNU_strp_alt:
328 case DW_FORM_line_strp:
329 case DW_FORM_strp_sup: {
330 Value.uval =
331 Data.getRelocatedValue(FP.getDwarfOffsetByteSize(), OffsetPtr);
332 break;
333 }
334 case DW_FORM_flag_present:
335 Value.uval = 1;
336 break;
337 case DW_FORM_ref_sig8:
338 Value.uval = Data.getU64(OffsetPtr);
339 break;
340 case DW_FORM_GNU_addr_index:
341 case DW_FORM_GNU_str_index:
342 case DW_FORM_addrx:
343 case DW_FORM_strx:
344 Value.uval = Data.getULEB128(OffsetPtr);
345 break;
346 default:
347 // DWARFFormValue::skipValue() will have caught this and caused all
348 // DWARF DIEs to fail to be parsed, so this code is not be reachable.
349 llvm_unreachable("unsupported form");
350 }
351 } while (Indirect);
352
353 if (IsBlock) {
354 StringRef Str = Data.getData().substr(*OffsetPtr, Value.uval);
355 Value.data = nullptr;
356 if (!Str.empty()) {
357 Value.data = Str.bytes_begin();
358 *OffsetPtr += Value.uval;
359 }
360 }
361
362 return true;
363 }
364
365 void DWARFFormValue::dumpSectionedAddress(raw_ostream &OS,
366 DIDumpOptions DumpOpts,
367 object::SectionedAddress SA) const {
368 OS << format("0x%016" PRIx64, SA.Address);
369 dumpAddressSection(U->getContext().getDWARFObj(), OS, DumpOpts,
370 SA.SectionIndex);
371 }
372
373 void DWARFFormValue::dumpAddressSection(const DWARFObject &Obj, raw_ostream &OS,
374 DIDumpOptions DumpOpts,
375 uint64_t SectionIndex) {
376 if (!DumpOpts.Verbose || SectionIndex == -1ULL)
377 return;
378 ArrayRef<SectionName> SectionNames = Obj.getSectionNames();
379 const auto &SecRef = SectionNames[SectionIndex];
380
381 OS << " \"" << SecRef.Name << '\"';
382
383 // Print section index if name is not unique.
384 if (!SecRef.IsNameUnique)
385 OS << format(" [%" PRIu64 "]", SectionIndex);
386 }
387
388 void DWARFFormValue::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
389 uint64_t UValue = Value.uval;
390 bool CURelativeOffset = false;
391 raw_ostream &AddrOS = DumpOpts.ShowAddresses
392 ? WithColor(OS, HighlightColor::Address).get()
393 : nulls();
394 switch (Form) {
395 case DW_FORM_addr:
396 dumpSectionedAddress(AddrOS, DumpOpts, {Value.uval, Value.SectionIndex});
397 break;
398 case DW_FORM_addrx:
399 case DW_FORM_addrx1:
400 case DW_FORM_addrx2:
401 case DW_FORM_addrx3:
402 case DW_FORM_addrx4:
403 case DW_FORM_GNU_addr_index: {
404 if (U == nullptr) {
405 OS << "<invalid dwarf unit>";
406 break;
407 }
408 Optional<object::SectionedAddress> A = U->getAddrOffsetSectionItem(UValue);
409 if (!A || DumpOpts.Verbose)
410 AddrOS << format("indexed (%8.8x) address = ", (uint32_t)UValue);
411 if (A)
412 dumpSectionedAddress(AddrOS, DumpOpts, *A);
413 else
414 OS << "<no .debug_addr section>";
415 break;
416 }
417 case DW_FORM_flag_present:
418 OS << "true";
419 break;
420 case DW_FORM_flag:
421 case DW_FORM_data1:
422 OS << format("0x%02x", (uint8_t)UValue);
423 break;
424 case DW_FORM_data2:
425 OS << format("0x%04x", (uint16_t)UValue);
426 break;
427 case DW_FORM_data4:
428 OS << format("0x%08x", (uint32_t)UValue);
429 break;
430 case DW_FORM_ref_sig8:
431 AddrOS << format("0x%016" PRIx64, UValue);
432 break;
433 case DW_FORM_data8:
434 OS << format("0x%016" PRIx64, UValue);
435 break;
436 case DW_FORM_data16:
437 OS << format_bytes(ArrayRef<uint8_t>(Value.data, 16), None, 16, 16);
438 break;
439 case DW_FORM_string:
440 OS << '"';
441 OS.write_escaped(Value.cstr);
442 OS << '"';
443 break;
444 case DW_FORM_exprloc:
445 case DW_FORM_block:
446 case DW_FORM_block1:
447 case DW_FORM_block2:
448 case DW_FORM_block4:
449 if (UValue > 0) {
450 switch (Form) {
451 case DW_FORM_exprloc:
452 case DW_FORM_block:
453 AddrOS << format("<0x%" PRIx64 "> ", UValue);
454 break;
455 case DW_FORM_block1:
456 AddrOS << format("<0x%2.2x> ", (uint8_t)UValue);
457 break;
458 case DW_FORM_block2:
459 AddrOS << format("<0x%4.4x> ", (uint16_t)UValue);
460 break;
461 case DW_FORM_block4:
462 AddrOS << format("<0x%8.8x> ", (uint32_t)UValue);
463 break;
464 default:
465 break;
466 }
467
468 const uint8_t *DataPtr = Value.data;
469 if (DataPtr) {
470 // UValue contains size of block
471 const uint8_t *EndDataPtr = DataPtr + UValue;
472 while (DataPtr < EndDataPtr) {
473 AddrOS << format("%2.2x ", *DataPtr);
474 ++DataPtr;
475 }
476 } else
477 OS << "NULL";
478 }
479 break;
480
481 case DW_FORM_sdata:
482 OS << Value.sval;
483 break;
484 case DW_FORM_udata:
485 OS << Value.uval;
486 break;
487 case DW_FORM_strp:
488 if (DumpOpts.Verbose)
489 OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)UValue);
490 dumpString(OS);
491 break;
492 case DW_FORM_line_strp:
493 if (DumpOpts.Verbose)
494 OS << format(" .debug_line_str[0x%8.8x] = ", (uint32_t)UValue);
495 dumpString(OS);
496 break;
497 case DW_FORM_strx:
498 case DW_FORM_strx1:
499 case DW_FORM_strx2:
500 case DW_FORM_strx3:
501 case DW_FORM_strx4:
502 case DW_FORM_GNU_str_index:
503 if (DumpOpts.Verbose)
504 OS << format("indexed (%8.8x) string = ", (uint32_t)UValue);
505 dumpString(OS);
506 break;
507 case DW_FORM_GNU_strp_alt:
508 if (DumpOpts.Verbose)
509 OS << format("alt indirect string, offset: 0x%" PRIx64 "", UValue);
510 dumpString(OS);
511 break;
512 case DW_FORM_ref_addr:
513 AddrOS << format("0x%016" PRIx64, UValue);
514 break;
515 case DW_FORM_ref1:
516 CURelativeOffset = true;
517 if (DumpOpts.Verbose)
518 AddrOS << format("cu + 0x%2.2x", (uint8_t)UValue);
519 break;
520 case DW_FORM_ref2:
521 CURelativeOffset = true;
522 if (DumpOpts.Verbose)
523 AddrOS << format("cu + 0x%4.4x", (uint16_t)UValue);
524 break;
525 case DW_FORM_ref4:
526 CURelativeOffset = true;
527 if (DumpOpts.Verbose)
528 AddrOS << format("cu + 0x%4.4x", (uint32_t)UValue);
529 break;
530 case DW_FORM_ref8:
531 CURelativeOffset = true;
532 if (DumpOpts.Verbose)
533 AddrOS << format("cu + 0x%8.8" PRIx64, UValue);
534 break;
535 case DW_FORM_ref_udata:
536 CURelativeOffset = true;
537 if (DumpOpts.Verbose)
538 AddrOS << format("cu + 0x%" PRIx64, UValue);
539 break;
540 case DW_FORM_GNU_ref_alt:
541 AddrOS << format("<alt 0x%" PRIx64 ">", UValue);
542 break;
543
544 // All DW_FORM_indirect attributes should be resolved prior to calling
545 // this function
546 case DW_FORM_indirect:
547 OS << "DW_FORM_indirect";
548 break;
549
550 case DW_FORM_rnglistx:
551 OS << format("indexed (0x%x) rangelist = ", (uint32_t)UValue);
552 break;
553
554 // Should be formatted to 64-bit for DWARF64.
555 case DW_FORM_sec_offset:
556 AddrOS << format("0x%08x", (uint32_t)UValue);
557 break;
558
559 default:
560 OS << format("DW_FORM(0x%4.4x)", Form);
561 break;
562 }
563
564 if (CURelativeOffset) {
565 if (DumpOpts.Verbose)
566 OS << " => {";
567 if (DumpOpts.ShowAddresses)
568 WithColor(OS, HighlightColor::Address).get()
569 << format("0x%8.8" PRIx64, UValue + (U ? U->getOffset() : 0));
570 if (DumpOpts.Verbose)
571 OS << "}";
572 }
573 }
574
575 void DWARFFormValue::dumpString(raw_ostream &OS) const {
576 Optional<const char *> DbgStr = getAsCString();
577 if (DbgStr.hasValue()) {
578 auto COS = WithColor(OS, HighlightColor::String);
579 COS.get() << '"';
580 COS.get().write_escaped(DbgStr.getValue());
581 COS.get() << '"';
582 }
583 }
584
585 Optional<const char *> DWARFFormValue::getAsCString() const {
586 if (!isFormClass(FC_String))
587 return None;
588 if (Form == DW_FORM_string)
589 return Value.cstr;
590 // FIXME: Add support for DW_FORM_GNU_strp_alt
591 if (Form == DW_FORM_GNU_strp_alt || C == nullptr)
592 return None;
593 uint64_t Offset = Value.uval;
594 if (Form == DW_FORM_line_strp) {
595 // .debug_line_str is tracked in the Context.
596 if (const char *Str = C->getLineStringExtractor().getCStr(&Offset))
597 return Str;
598 return None;
599 }
600 if (Form == DW_FORM_GNU_str_index || Form == DW_FORM_strx ||
601 Form == DW_FORM_strx1 || Form == DW_FORM_strx2 || Form == DW_FORM_strx3 ||
602 Form == DW_FORM_strx4) {
603 if (!U)
604 return None;
605 Optional<uint64_t> StrOffset = U->getStringOffsetSectionItem(Offset);
606 if (!StrOffset)
607 return None;
608 Offset = *StrOffset;
609 }
610 // Prefer the Unit's string extractor, because for .dwo it will point to
611 // .debug_str.dwo, while the Context's extractor always uses .debug_str.
612 if (U) {
613 if (const char *Str = U->getStringExtractor().getCStr(&Offset))
614 return Str;
615 return None;
616 }
617 if (const char *Str = C->getStringExtractor().getCStr(&Offset))
618 return Str;
619 return None;
620 }
621
622 Optional<uint64_t> DWARFFormValue::getAsAddress() const {
623 if (auto SA = getAsSectionedAddress())
624 return SA->Address;
625 return None;
626 }
627
628 Optional<object::SectionedAddress>
629 DWARFFormValue::getAsSectionedAddress() const {
630 if (!isFormClass(FC_Address))
631 return None;
632 if (Form == DW_FORM_GNU_addr_index || Form == DW_FORM_addrx) {
633 uint32_t Index = Value.uval;
634 if (!U)
635 return None;
636 Optional<object::SectionedAddress> SA = U->getAddrOffsetSectionItem(Index);
637 if (!SA)
638 return None;
639 return SA;
640 }
641 return {{Value.uval, Value.SectionIndex}};
642 }
643
644 Optional<uint64_t> DWARFFormValue::getAsReference() const {
645 if (auto R = getAsRelativeReference())
646 return R->Unit ? R->Unit->getOffset() + R->Offset : R->Offset;
647 return None;
648 }
649
650 Optional<DWARFFormValue::UnitOffset> DWARFFormValue::getAsRelativeReference() const {
651 if (!isFormClass(FC_Reference))
652 return None;
653 switch (Form) {
654 case DW_FORM_ref1:
655 case DW_FORM_ref2:
656 case DW_FORM_ref4:
657 case DW_FORM_ref8:
658 case DW_FORM_ref_udata:
659 if (!U)
660 return None;
661 return UnitOffset{const_cast<DWARFUnit*>(U), Value.uval};
662 case DW_FORM_ref_addr:
663 case DW_FORM_ref_sig8:
664 case DW_FORM_GNU_ref_alt:
665 return UnitOffset{nullptr, Value.uval};
666 default:
667 return None;
668 }
669 }
670
671 Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const {
672 if (!isFormClass(FC_SectionOffset))
673 return None;
674 return Value.uval;
675 }
676
677 Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
678 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
679 Form == DW_FORM_sdata)
680 return None;
681 return Value.uval;
682 }
683
684 Optional<int64_t> DWARFFormValue::getAsSignedConstant() const {
685 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
686 (Form == DW_FORM_udata &&
687 uint64_t(std::numeric_limits<int64_t>::max()) < Value.uval))
688 return None;
689 switch (Form) {
690 case DW_FORM_data4:
691 return int32_t(Value.uval);
692 case DW_FORM_data2:
693 return int16_t(Value.uval);
694 case DW_FORM_data1:
695 return int8_t(Value.uval);
696 case DW_FORM_sdata:
697 case DW_FORM_data8:
698 default:
699 return Value.sval;
700 }
701 }
702
703 Optional<ArrayRef<uint8_t>> DWARFFormValue::getAsBlock() const {
704 if (!isFormClass(FC_Block) && !isFormClass(FC_Exprloc) &&
705 Form != DW_FORM_data16)
706 return None;
707 return makeArrayRef(Value.data, Value.uval);
708 }
709
710 Optional<uint64_t> DWARFFormValue::getAsCStringOffset() const {
711 if (!isFormClass(FC_String) && Form == DW_FORM_string)
712 return None;
713 return Value.uval;
714 }
715
716 Optional<uint64_t> DWARFFormValue::getAsReferenceUVal() const {
717 if (!isFormClass(FC_Reference))
718 return None;
719 return Value.uval;
720 }
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