1 //===- DWARFFormValue.cpp -------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/ADT/None.h"
13 #include "llvm/ADT/Optional.h"
14 #include "llvm/ADT/StringRef.h"
15 #include "llvm/BinaryFormat/Dwarf.h"
16 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
17 #include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
18 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/Format.h"
21 #include "llvm/Support/WithColor.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include <cinttypes>
24 #include <cstdint>
25 #include <limits>
26
27 using namespace llvm;
28 using namespace dwarf;
29
30 static const DWARFFormValue::FormClass DWARF5FormClasses[] = {
31 DWARFFormValue::FC_Unknown, // 0x0
32 DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr
33 DWARFFormValue::FC_Unknown, // 0x02 unused
34 DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2
35 DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4
36 DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2
37 // --- These can be FC_SectionOffset in DWARF3 and below:
38 DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4
39 DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8
40 // ---
41 DWARFFormValue::FC_String, // 0x08 DW_FORM_string
42 DWARFFormValue::FC_Block, // 0x09 DW_FORM_block
43 DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1
44 DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1
45 DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag
46 DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata
47 DWARFFormValue::FC_String, // 0x0e DW_FORM_strp
48 DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata
49 DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr
50 DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1
51 DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2
52 DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4
53 DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8
54 DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata
55 DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect
56 DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset
57 DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc
58 DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present
59 DWARFFormValue::FC_String, // 0x1a DW_FORM_strx
60 DWARFFormValue::FC_Address, // 0x1b DW_FORM_addrx
61 DWARFFormValue::FC_Reference, // 0x1c DW_FORM_ref_sup4
62 DWARFFormValue::FC_String, // 0x1d DW_FORM_strp_sup
63 DWARFFormValue::FC_Constant, // 0x1e DW_FORM_data16
64 DWARFFormValue::FC_String, // 0x1f DW_FORM_line_strp
65 DWARFFormValue::FC_Reference, // 0x20 DW_FORM_ref_sig8
66 DWARFFormValue::FC_Constant, // 0x21 DW_FORM_implicit_const
67 DWARFFormValue::FC_SectionOffset, // 0x22 DW_FORM_loclistx
68 DWARFFormValue::FC_SectionOffset, // 0x23 DW_FORM_rnglistx
69 DWARFFormValue::FC_Reference, // 0x24 DW_FORM_ref_sup8
70 DWARFFormValue::FC_String, // 0x25 DW_FORM_strx1
71 DWARFFormValue::FC_String, // 0x26 DW_FORM_strx2
72 DWARFFormValue::FC_String, // 0x27 DW_FORM_strx3
73 DWARFFormValue::FC_String, // 0x28 DW_FORM_strx4
74 DWARFFormValue::FC_Address, // 0x29 DW_FORM_addrx1
75 DWARFFormValue::FC_Address, // 0x2a DW_FORM_addrx2
76 DWARFFormValue::FC_Address, // 0x2b DW_FORM_addrx3
77 DWARFFormValue::FC_Address, // 0x2c DW_FORM_addrx4
78
79 };
80
skipValue(dwarf::Form Form,DataExtractor DebugInfoData,uint32_t * OffsetPtr,const dwarf::FormParams Params)81 bool DWARFFormValue::skipValue(dwarf::Form Form, DataExtractor DebugInfoData,
82 uint32_t *OffsetPtr,
83 const dwarf::FormParams Params) {
84 bool Indirect = false;
85 do {
86 switch (Form) {
87 // Blocks of inlined data that have a length field and the data bytes
88 // inlined in the .debug_info.
89 case DW_FORM_exprloc:
90 case DW_FORM_block: {
91 uint64_t size = DebugInfoData.getULEB128(OffsetPtr);
92 *OffsetPtr += size;
93 return true;
94 }
95 case DW_FORM_block1: {
96 uint8_t size = DebugInfoData.getU8(OffsetPtr);
97 *OffsetPtr += size;
98 return true;
99 }
100 case DW_FORM_block2: {
101 uint16_t size = DebugInfoData.getU16(OffsetPtr);
102 *OffsetPtr += size;
103 return true;
104 }
105 case DW_FORM_block4: {
106 uint32_t size = DebugInfoData.getU32(OffsetPtr);
107 *OffsetPtr += size;
108 return true;
109 }
110
111 // Inlined NULL terminated C-strings.
112 case DW_FORM_string:
113 DebugInfoData.getCStr(OffsetPtr);
114 return true;
115
116 case DW_FORM_addr:
117 case DW_FORM_ref_addr:
118 case DW_FORM_flag_present:
119 case DW_FORM_data1:
120 case DW_FORM_data2:
121 case DW_FORM_data4:
122 case DW_FORM_data8:
123 case DW_FORM_data16:
124 case DW_FORM_flag:
125 case DW_FORM_ref1:
126 case DW_FORM_ref2:
127 case DW_FORM_ref4:
128 case DW_FORM_ref8:
129 case DW_FORM_ref_sig8:
130 case DW_FORM_ref_sup4:
131 case DW_FORM_ref_sup8:
132 case DW_FORM_strx1:
133 case DW_FORM_strx2:
134 case DW_FORM_strx4:
135 case DW_FORM_addrx1:
136 case DW_FORM_addrx2:
137 case DW_FORM_addrx4:
138 case DW_FORM_sec_offset:
139 case DW_FORM_strp:
140 case DW_FORM_strp_sup:
141 case DW_FORM_line_strp:
142 case DW_FORM_GNU_ref_alt:
143 case DW_FORM_GNU_strp_alt:
144 if (Optional<uint8_t> FixedSize =
145 dwarf::getFixedFormByteSize(Form, Params)) {
146 *OffsetPtr += *FixedSize;
147 return true;
148 }
149 return false;
150
151 // signed or unsigned LEB 128 values.
152 case DW_FORM_sdata:
153 DebugInfoData.getSLEB128(OffsetPtr);
154 return true;
155
156 case DW_FORM_udata:
157 case DW_FORM_ref_udata:
158 case DW_FORM_strx:
159 case DW_FORM_addrx:
160 case DW_FORM_loclistx:
161 case DW_FORM_rnglistx:
162 case DW_FORM_GNU_addr_index:
163 case DW_FORM_GNU_str_index:
164 DebugInfoData.getULEB128(OffsetPtr);
165 return true;
166
167 case DW_FORM_indirect:
168 Indirect = true;
169 Form = static_cast<dwarf::Form>(DebugInfoData.getULEB128(OffsetPtr));
170 break;
171
172 default:
173 return false;
174 }
175 } while (Indirect);
176 return true;
177 }
178
isFormClass(DWARFFormValue::FormClass FC) const179 bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
180 // First, check DWARF5 form classes.
181 if (Form < makeArrayRef(DWARF5FormClasses).size() &&
182 DWARF5FormClasses[Form] == FC)
183 return true;
184 // Check more forms from extensions and proposals.
185 switch (Form) {
186 case DW_FORM_GNU_ref_alt:
187 return (FC == FC_Reference);
188 case DW_FORM_GNU_addr_index:
189 return (FC == FC_Address);
190 case DW_FORM_GNU_str_index:
191 case DW_FORM_GNU_strp_alt:
192 return (FC == FC_String);
193 default:
194 break;
195 }
196 // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
197 // Don't check for DWARF version here, as some producers may still do this
198 // by mistake. Also accept DW_FORM_[line_]strp since these are
199 // .debug_[line_]str section offsets.
200 return (Form == DW_FORM_data4 || Form == DW_FORM_data8 ||
201 Form == DW_FORM_strp || Form == DW_FORM_line_strp) &&
202 FC == FC_SectionOffset;
203 }
204
extractValue(const DWARFDataExtractor & Data,uint32_t * OffsetPtr,dwarf::FormParams FP,const DWARFContext * Ctx,const DWARFUnit * CU)205 bool DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
206 uint32_t *OffsetPtr, dwarf::FormParams FP,
207 const DWARFContext *Ctx,
208 const DWARFUnit *CU) {
209 if (!Ctx && CU)
210 Ctx = &CU->getContext();
211 C = Ctx;
212 U = CU;
213 bool Indirect = false;
214 bool IsBlock = false;
215 Value.data = nullptr;
216 // Read the value for the form into value and follow and DW_FORM_indirect
217 // instances we run into
218 do {
219 Indirect = false;
220 switch (Form) {
221 case DW_FORM_addr:
222 case DW_FORM_ref_addr: {
223 uint16_t Size =
224 (Form == DW_FORM_addr) ? FP.AddrSize : FP.getRefAddrByteSize();
225 Value.uval = Data.getRelocatedValue(Size, OffsetPtr, &Value.SectionIndex);
226 break;
227 }
228 case DW_FORM_exprloc:
229 case DW_FORM_block:
230 Value.uval = Data.getULEB128(OffsetPtr);
231 IsBlock = true;
232 break;
233 case DW_FORM_block1:
234 Value.uval = Data.getU8(OffsetPtr);
235 IsBlock = true;
236 break;
237 case DW_FORM_block2:
238 Value.uval = Data.getU16(OffsetPtr);
239 IsBlock = true;
240 break;
241 case DW_FORM_block4:
242 Value.uval = Data.getU32(OffsetPtr);
243 IsBlock = true;
244 break;
245 case DW_FORM_data1:
246 case DW_FORM_ref1:
247 case DW_FORM_flag:
248 case DW_FORM_strx1:
249 case DW_FORM_addrx1:
250 Value.uval = Data.getU8(OffsetPtr);
251 break;
252 case DW_FORM_data2:
253 case DW_FORM_ref2:
254 case DW_FORM_strx2:
255 case DW_FORM_addrx2:
256 Value.uval = Data.getU16(OffsetPtr);
257 break;
258 case DW_FORM_strx3:
259 Value.uval = Data.getU24(OffsetPtr);
260 break;
261 case DW_FORM_data4:
262 case DW_FORM_ref4:
263 case DW_FORM_ref_sup4:
264 case DW_FORM_strx4:
265 case DW_FORM_addrx4:
266 Value.uval = Data.getRelocatedValue(4, OffsetPtr);
267 break;
268 case DW_FORM_data8:
269 case DW_FORM_ref8:
270 case DW_FORM_ref_sup8:
271 Value.uval = Data.getU64(OffsetPtr);
272 break;
273 case DW_FORM_data16:
274 // Treat this like a 16-byte block.
275 Value.uval = 16;
276 IsBlock = true;
277 break;
278 case DW_FORM_sdata:
279 Value.sval = Data.getSLEB128(OffsetPtr);
280 break;
281 case DW_FORM_udata:
282 case DW_FORM_ref_udata:
283 case DW_FORM_rnglistx:
284 Value.uval = Data.getULEB128(OffsetPtr);
285 break;
286 case DW_FORM_string:
287 Value.cstr = Data.getCStr(OffsetPtr);
288 break;
289 case DW_FORM_indirect:
290 Form = static_cast<dwarf::Form>(Data.getULEB128(OffsetPtr));
291 Indirect = true;
292 break;
293 case DW_FORM_strp:
294 case DW_FORM_sec_offset:
295 case DW_FORM_GNU_ref_alt:
296 case DW_FORM_GNU_strp_alt:
297 case DW_FORM_line_strp:
298 case DW_FORM_strp_sup: {
299 Value.uval =
300 Data.getRelocatedValue(FP.getDwarfOffsetByteSize(), OffsetPtr);
301 break;
302 }
303 case DW_FORM_flag_present:
304 Value.uval = 1;
305 break;
306 case DW_FORM_ref_sig8:
307 Value.uval = Data.getU64(OffsetPtr);
308 break;
309 case DW_FORM_GNU_addr_index:
310 case DW_FORM_GNU_str_index:
311 case DW_FORM_strx:
312 Value.uval = Data.getULEB128(OffsetPtr);
313 break;
314 default:
315 // DWARFFormValue::skipValue() will have caught this and caused all
316 // DWARF DIEs to fail to be parsed, so this code is not be reachable.
317 llvm_unreachable("unsupported form");
318 }
319 } while (Indirect);
320
321 if (IsBlock) {
322 StringRef Str = Data.getData().substr(*OffsetPtr, Value.uval);
323 Value.data = nullptr;
324 if (!Str.empty()) {
325 Value.data = reinterpret_cast<const uint8_t *>(Str.data());
326 *OffsetPtr += Value.uval;
327 }
328 }
329
330 return true;
331 }
332
dump(raw_ostream & OS,DIDumpOptions DumpOpts) const333 void DWARFFormValue::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
334 uint64_t UValue = Value.uval;
335 bool CURelativeOffset = false;
336 raw_ostream &AddrOS = DumpOpts.ShowAddresses
337 ? WithColor(OS, HighlightColor::Address).get()
338 : nulls();
339 switch (Form) {
340 case DW_FORM_addr:
341 AddrOS << format("0x%016" PRIx64, UValue);
342 break;
343 case DW_FORM_GNU_addr_index: {
344 AddrOS << format(" indexed (%8.8x) address = ", (uint32_t)UValue);
345 uint64_t Address;
346 if (U == nullptr)
347 OS << "<invalid dwarf unit>";
348 else if (U->getAddrOffsetSectionItem(UValue, Address))
349 AddrOS << format("0x%016" PRIx64, Address);
350 else
351 OS << "<no .debug_addr section>";
352 break;
353 }
354 case DW_FORM_flag_present:
355 OS << "true";
356 break;
357 case DW_FORM_flag:
358 case DW_FORM_data1:
359 OS << format("0x%02x", (uint8_t)UValue);
360 break;
361 case DW_FORM_data2:
362 OS << format("0x%04x", (uint16_t)UValue);
363 break;
364 case DW_FORM_data4:
365 OS << format("0x%08x", (uint32_t)UValue);
366 break;
367 case DW_FORM_ref_sig8:
368 AddrOS << format("0x%016" PRIx64, UValue);
369 break;
370 case DW_FORM_data8:
371 OS << format("0x%016" PRIx64, UValue);
372 break;
373 case DW_FORM_data16:
374 OS << format_bytes(ArrayRef<uint8_t>(Value.data, 16), None, 16, 16);
375 break;
376 case DW_FORM_string:
377 OS << '"';
378 OS.write_escaped(Value.cstr);
379 OS << '"';
380 break;
381 case DW_FORM_exprloc:
382 case DW_FORM_block:
383 case DW_FORM_block1:
384 case DW_FORM_block2:
385 case DW_FORM_block4:
386 if (UValue > 0) {
387 switch (Form) {
388 case DW_FORM_exprloc:
389 case DW_FORM_block:
390 OS << format("<0x%" PRIx64 "> ", UValue);
391 break;
392 case DW_FORM_block1:
393 OS << format("<0x%2.2x> ", (uint8_t)UValue);
394 break;
395 case DW_FORM_block2:
396 OS << format("<0x%4.4x> ", (uint16_t)UValue);
397 break;
398 case DW_FORM_block4:
399 OS << format("<0x%8.8x> ", (uint32_t)UValue);
400 break;
401 default:
402 break;
403 }
404
405 const uint8_t *DataPtr = Value.data;
406 if (DataPtr) {
407 // UValue contains size of block
408 const uint8_t *EndDataPtr = DataPtr + UValue;
409 while (DataPtr < EndDataPtr) {
410 OS << format("%2.2x ", *DataPtr);
411 ++DataPtr;
412 }
413 } else
414 OS << "NULL";
415 }
416 break;
417
418 case DW_FORM_sdata:
419 OS << Value.sval;
420 break;
421 case DW_FORM_udata:
422 OS << Value.uval;
423 break;
424 case DW_FORM_strp:
425 if (DumpOpts.Verbose)
426 OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)UValue);
427 dumpString(OS);
428 break;
429 case DW_FORM_line_strp:
430 if (DumpOpts.Verbose)
431 OS << format(" .debug_line_str[0x%8.8x] = ", (uint32_t)UValue);
432 dumpString(OS);
433 break;
434 case DW_FORM_strx:
435 case DW_FORM_strx1:
436 case DW_FORM_strx2:
437 case DW_FORM_strx3:
438 case DW_FORM_strx4:
439 case DW_FORM_GNU_str_index:
440 if (DumpOpts.Verbose)
441 OS << format(" indexed (%8.8x) string = ", (uint32_t)UValue);
442 dumpString(OS);
443 break;
444 case DW_FORM_GNU_strp_alt:
445 if (DumpOpts.Verbose)
446 OS << format("alt indirect string, offset: 0x%" PRIx64 "", UValue);
447 dumpString(OS);
448 break;
449 case DW_FORM_ref_addr:
450 AddrOS << format("0x%016" PRIx64, UValue);
451 break;
452 case DW_FORM_ref1:
453 CURelativeOffset = true;
454 if (DumpOpts.Verbose)
455 AddrOS << format("cu + 0x%2.2x", (uint8_t)UValue);
456 break;
457 case DW_FORM_ref2:
458 CURelativeOffset = true;
459 if (DumpOpts.Verbose)
460 AddrOS << format("cu + 0x%4.4x", (uint16_t)UValue);
461 break;
462 case DW_FORM_ref4:
463 CURelativeOffset = true;
464 if (DumpOpts.Verbose)
465 AddrOS << format("cu + 0x%4.4x", (uint32_t)UValue);
466 break;
467 case DW_FORM_ref8:
468 CURelativeOffset = true;
469 if (DumpOpts.Verbose)
470 AddrOS << format("cu + 0x%8.8" PRIx64, UValue);
471 break;
472 case DW_FORM_ref_udata:
473 CURelativeOffset = true;
474 if (DumpOpts.Verbose)
475 AddrOS << format("cu + 0x%" PRIx64, UValue);
476 break;
477 case DW_FORM_GNU_ref_alt:
478 AddrOS << format("<alt 0x%" PRIx64 ">", UValue);
479 break;
480
481 // All DW_FORM_indirect attributes should be resolved prior to calling
482 // this function
483 case DW_FORM_indirect:
484 OS << "DW_FORM_indirect";
485 break;
486
487 case DW_FORM_rnglistx:
488 OS << format("indexed (0x%x) rangelist = ", (uint32_t)UValue);
489 break;
490
491 // Should be formatted to 64-bit for DWARF64.
492 case DW_FORM_sec_offset:
493 AddrOS << format("0x%08x", (uint32_t)UValue);
494 break;
495
496 default:
497 OS << format("DW_FORM(0x%4.4x)", Form);
498 break;
499 }
500
501 if (CURelativeOffset) {
502 if (DumpOpts.Verbose)
503 OS << " => {";
504 WithColor(OS, HighlightColor::Address).get()
505 << format("0x%8.8" PRIx64, UValue + (U ? U->getOffset() : 0));
506 if (DumpOpts.Verbose)
507 OS << "}";
508 }
509 }
510
dumpString(raw_ostream & OS) const511 void DWARFFormValue::dumpString(raw_ostream &OS) const {
512 Optional<const char *> DbgStr = getAsCString();
513 if (DbgStr.hasValue()) {
514 auto COS = WithColor(OS, HighlightColor::String);
515 COS.get() << '"';
516 COS.get().write_escaped(DbgStr.getValue());
517 COS.get() << '"';
518 }
519 }
520
getAsCString() const521 Optional<const char *> DWARFFormValue::getAsCString() const {
522 if (!isFormClass(FC_String))
523 return None;
524 if (Form == DW_FORM_string)
525 return Value.cstr;
526 // FIXME: Add support for DW_FORM_GNU_strp_alt
527 if (Form == DW_FORM_GNU_strp_alt || C == nullptr)
528 return None;
529 uint32_t Offset = Value.uval;
530 if (Form == DW_FORM_line_strp) {
531 // .debug_line_str is tracked in the Context.
532 if (const char *Str = C->getLineStringExtractor().getCStr(&Offset))
533 return Str;
534 return None;
535 }
536 if (Form == DW_FORM_GNU_str_index || Form == DW_FORM_strx ||
537 Form == DW_FORM_strx1 || Form == DW_FORM_strx2 || Form == DW_FORM_strx3 ||
538 Form == DW_FORM_strx4) {
539 uint64_t StrOffset;
540 if (!U || !U->getStringOffsetSectionItem(Offset, StrOffset))
541 return None;
542 Offset = StrOffset;
543 }
544 // Prefer the Unit's string extractor, because for .dwo it will point to
545 // .debug_str.dwo, while the Context's extractor always uses .debug_str.
546 if (U) {
547 if (const char *Str = U->getStringExtractor().getCStr(&Offset))
548 return Str;
549 return None;
550 }
551 if (const char *Str = C->getStringExtractor().getCStr(&Offset))
552 return Str;
553 return None;
554 }
555
getAsAddress() const556 Optional<uint64_t> DWARFFormValue::getAsAddress() const {
557 if (!isFormClass(FC_Address))
558 return None;
559 if (Form == DW_FORM_GNU_addr_index) {
560 uint32_t Index = Value.uval;
561 uint64_t Result;
562 if (!U || !U->getAddrOffsetSectionItem(Index, Result))
563 return None;
564 return Result;
565 }
566 return Value.uval;
567 }
568
getAsReference() const569 Optional<uint64_t> DWARFFormValue::getAsReference() const {
570 if (!isFormClass(FC_Reference))
571 return None;
572 switch (Form) {
573 case DW_FORM_ref1:
574 case DW_FORM_ref2:
575 case DW_FORM_ref4:
576 case DW_FORM_ref8:
577 case DW_FORM_ref_udata:
578 if (!U)
579 return None;
580 return Value.uval + U->getOffset();
581 case DW_FORM_ref_addr:
582 case DW_FORM_ref_sig8:
583 case DW_FORM_GNU_ref_alt:
584 return Value.uval;
585 default:
586 return None;
587 }
588 }
589
getAsSectionOffset() const590 Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const {
591 if (!isFormClass(FC_SectionOffset))
592 return None;
593 return Value.uval;
594 }
595
getAsUnsignedConstant() const596 Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
597 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
598 Form == DW_FORM_sdata)
599 return None;
600 return Value.uval;
601 }
602
getAsSignedConstant() const603 Optional<int64_t> DWARFFormValue::getAsSignedConstant() const {
604 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
605 (Form == DW_FORM_udata &&
606 uint64_t(std::numeric_limits<int64_t>::max()) < Value.uval))
607 return None;
608 switch (Form) {
609 case DW_FORM_data4:
610 return int32_t(Value.uval);
611 case DW_FORM_data2:
612 return int16_t(Value.uval);
613 case DW_FORM_data1:
614 return int8_t(Value.uval);
615 case DW_FORM_sdata:
616 case DW_FORM_data8:
617 default:
618 return Value.sval;
619 }
620 }
621
getAsBlock() const622 Optional<ArrayRef<uint8_t>> DWARFFormValue::getAsBlock() const {
623 if (!isFormClass(FC_Block) && !isFormClass(FC_Exprloc) &&
624 Form != DW_FORM_data16)
625 return None;
626 return makeArrayRef(Value.data, Value.uval);
627 }
628
getAsCStringOffset() const629 Optional<uint64_t> DWARFFormValue::getAsCStringOffset() const {
630 if (!isFormClass(FC_String) && Form == DW_FORM_string)
631 return None;
632 return Value.uval;
633 }
634
getAsReferenceUVal() const635 Optional<uint64_t> DWARFFormValue::getAsReferenceUVal() const {
636 if (!isFormClass(FC_Reference))
637 return None;
638 return Value.uval;
639 }
640