1 //===-- DWARFFormValue.cpp ------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "SyntaxHighlighting.h"
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
14 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
15 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
16 #include "llvm/Support/Debug.h"
17 #include "llvm/Support/Dwarf.h"
18 #include "llvm/Support/Format.h"
19 #include "llvm/Support/raw_ostream.h"
23 using namespace dwarf;
24 using namespace syntax;
27 uint8_t getRefAddrSize(uint8_t AddrSize, uint16_t Version) {
28 // FIXME: Support DWARF64.
29 return (Version == 2) ? AddrSize : 4;
32 template <uint8_t AddrSize, uint8_t RefAddrSize>
33 ArrayRef<uint8_t> makeFixedFormSizesArrayRef() {
34 static const uint8_t sizes[] = {
36 AddrSize, // 0x01 DW_FORM_addr
38 0, // 0x03 DW_FORM_block2
39 0, // 0x04 DW_FORM_block4
40 2, // 0x05 DW_FORM_data2
41 4, // 0x06 DW_FORM_data4
42 8, // 0x07 DW_FORM_data8
43 0, // 0x08 DW_FORM_string
44 0, // 0x09 DW_FORM_block
45 0, // 0x0a DW_FORM_block1
46 1, // 0x0b DW_FORM_data1
47 1, // 0x0c DW_FORM_flag
48 0, // 0x0d DW_FORM_sdata
49 4, // 0x0e DW_FORM_strp
50 0, // 0x0f DW_FORM_udata
51 RefAddrSize, // 0x10 DW_FORM_ref_addr
52 1, // 0x11 DW_FORM_ref1
53 2, // 0x12 DW_FORM_ref2
54 4, // 0x13 DW_FORM_ref4
55 8, // 0x14 DW_FORM_ref8
56 0, // 0x15 DW_FORM_ref_udata
57 0, // 0x16 DW_FORM_indirect
58 4, // 0x17 DW_FORM_sec_offset
59 0, // 0x18 DW_FORM_exprloc
60 0, // 0x19 DW_FORM_flag_present
62 return makeArrayRef(sizes);
66 ArrayRef<uint8_t> DWARFFormValue::getFixedFormSizes(uint8_t AddrSize,
68 uint8_t RefAddrSize = getRefAddrSize(AddrSize, Version);
69 if (AddrSize == 4 && RefAddrSize == 4)
70 return makeFixedFormSizesArrayRef<4, 4>();
71 if (AddrSize == 4 && RefAddrSize == 8)
72 return makeFixedFormSizesArrayRef<4, 8>();
73 if (AddrSize == 8 && RefAddrSize == 4)
74 return makeFixedFormSizesArrayRef<8, 4>();
75 if (AddrSize == 8 && RefAddrSize == 8)
76 return makeFixedFormSizesArrayRef<8, 8>();
80 static const DWARFFormValue::FormClass DWARF4FormClasses[] = {
81 DWARFFormValue::FC_Unknown, // 0x0
82 DWARFFormValue::FC_Address, // 0x01 DW_FORM_addr
83 DWARFFormValue::FC_Unknown, // 0x02 unused
84 DWARFFormValue::FC_Block, // 0x03 DW_FORM_block2
85 DWARFFormValue::FC_Block, // 0x04 DW_FORM_block4
86 DWARFFormValue::FC_Constant, // 0x05 DW_FORM_data2
87 // --- These can be FC_SectionOffset in DWARF3 and below:
88 DWARFFormValue::FC_Constant, // 0x06 DW_FORM_data4
89 DWARFFormValue::FC_Constant, // 0x07 DW_FORM_data8
91 DWARFFormValue::FC_String, // 0x08 DW_FORM_string
92 DWARFFormValue::FC_Block, // 0x09 DW_FORM_block
93 DWARFFormValue::FC_Block, // 0x0a DW_FORM_block1
94 DWARFFormValue::FC_Constant, // 0x0b DW_FORM_data1
95 DWARFFormValue::FC_Flag, // 0x0c DW_FORM_flag
96 DWARFFormValue::FC_Constant, // 0x0d DW_FORM_sdata
97 DWARFFormValue::FC_String, // 0x0e DW_FORM_strp
98 DWARFFormValue::FC_Constant, // 0x0f DW_FORM_udata
99 DWARFFormValue::FC_Reference, // 0x10 DW_FORM_ref_addr
100 DWARFFormValue::FC_Reference, // 0x11 DW_FORM_ref1
101 DWARFFormValue::FC_Reference, // 0x12 DW_FORM_ref2
102 DWARFFormValue::FC_Reference, // 0x13 DW_FORM_ref4
103 DWARFFormValue::FC_Reference, // 0x14 DW_FORM_ref8
104 DWARFFormValue::FC_Reference, // 0x15 DW_FORM_ref_udata
105 DWARFFormValue::FC_Indirect, // 0x16 DW_FORM_indirect
106 DWARFFormValue::FC_SectionOffset, // 0x17 DW_FORM_sec_offset
107 DWARFFormValue::FC_Exprloc, // 0x18 DW_FORM_exprloc
108 DWARFFormValue::FC_Flag, // 0x19 DW_FORM_flag_present
111 bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
112 // First, check DWARF4 form classes.
113 if (Form < ArrayRef<FormClass>(DWARF4FormClasses).size() &&
114 DWARF4FormClasses[Form] == FC)
116 // Check more forms from DWARF4 and DWARF5 proposals.
118 case DW_FORM_ref_sig8:
119 case DW_FORM_GNU_ref_alt:
120 return (FC == FC_Reference);
121 case DW_FORM_GNU_addr_index:
122 return (FC == FC_Address);
123 case DW_FORM_GNU_str_index:
124 case DW_FORM_GNU_strp_alt:
125 return (FC == FC_String);
127 // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
128 // Don't check for DWARF version here, as some producers may still do this
130 return (Form == DW_FORM_data4 || Form == DW_FORM_data8) &&
131 FC == FC_SectionOffset;
134 bool DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
135 const DWARFUnit *cu) {
136 bool indirect = false;
137 bool is_block = false;
138 Value.data = nullptr;
139 // Read the value for the form into value and follow and DW_FORM_indirect
140 // instances we run into
145 case DW_FORM_ref_addr: {
149 (Form == DW_FORM_addr)
150 ? cu->getAddressByteSize()
151 : getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
152 RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr);
153 if (AI != cu->getRelocMap()->end()) {
154 const std::pair<uint8_t, int64_t> &R = AI->second;
155 Value.uval = data.getUnsigned(offset_ptr, AddrSize) + R.second;
157 Value.uval = data.getUnsigned(offset_ptr, AddrSize);
160 case DW_FORM_exprloc:
162 Value.uval = data.getULEB128(offset_ptr);
166 Value.uval = data.getU8(offset_ptr);
170 Value.uval = data.getU16(offset_ptr);
174 Value.uval = data.getU32(offset_ptr);
180 Value.uval = data.getU8(offset_ptr);
184 Value.uval = data.getU16(offset_ptr);
188 Value.uval = data.getU32(offset_ptr);
191 RelocAddrMap::const_iterator AI = cu->getRelocMap()->find(*offset_ptr-4);
192 if (AI != cu->getRelocMap()->end())
193 Value.uval += AI->second.second;
198 Value.uval = data.getU64(offset_ptr);
201 Value.sval = data.getSLEB128(offset_ptr);
204 case DW_FORM_ref_udata:
205 Value.uval = data.getULEB128(offset_ptr);
208 Value.cstr = data.getCStr(offset_ptr);
210 case DW_FORM_indirect:
211 Form = data.getULEB128(offset_ptr);
214 case DW_FORM_sec_offset:
216 case DW_FORM_GNU_ref_alt:
217 case DW_FORM_GNU_strp_alt: {
218 // FIXME: This is 64-bit for DWARF64.
219 Value.uval = data.getU32(offset_ptr);
222 RelocAddrMap::const_iterator AI =
223 cu->getRelocMap()->find(*offset_ptr - 4);
224 if (AI != cu->getRelocMap()->end())
225 Value.uval += AI->second.second;
228 case DW_FORM_flag_present:
231 case DW_FORM_ref_sig8:
232 Value.uval = data.getU64(offset_ptr);
234 case DW_FORM_GNU_addr_index:
235 case DW_FORM_GNU_str_index:
236 Value.uval = data.getULEB128(offset_ptr);
244 StringRef str = data.getData().substr(*offset_ptr, Value.uval);
245 Value.data = nullptr;
247 Value.data = reinterpret_cast<const uint8_t *>(str.data());
248 *offset_ptr += Value.uval;
256 DWARFFormValue::skipValue(DataExtractor debug_info_data, uint32_t* offset_ptr,
257 const DWARFUnit *cu) const {
258 return DWARFFormValue::skipValue(Form, debug_info_data, offset_ptr, cu);
262 DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
263 uint32_t *offset_ptr, const DWARFUnit *cu) {
264 bool indirect = false;
267 // Blocks if inlined data that have a length field and the data bytes
268 // inlined in the .debug_info
269 case DW_FORM_exprloc:
270 case DW_FORM_block: {
271 uint64_t size = debug_info_data.getULEB128(offset_ptr);
275 case DW_FORM_block1: {
276 uint8_t size = debug_info_data.getU8(offset_ptr);
280 case DW_FORM_block2: {
281 uint16_t size = debug_info_data.getU16(offset_ptr);
285 case DW_FORM_block4: {
286 uint32_t size = debug_info_data.getU32(offset_ptr);
291 // Inlined NULL terminated C-strings
293 debug_info_data.getCStr(offset_ptr);
296 // Compile unit address sized values
298 *offset_ptr += cu->getAddressByteSize();
300 case DW_FORM_ref_addr:
301 *offset_ptr += getRefAddrSize(cu->getAddressByteSize(), cu->getVersion());
304 // 0 byte values - implied from the form.
305 case DW_FORM_flag_present:
330 case DW_FORM_ref_sig8:
334 // signed or unsigned LEB 128 values
335 // case DW_FORM_APPLE_db_str:
338 case DW_FORM_ref_udata:
339 case DW_FORM_GNU_str_index:
340 case DW_FORM_GNU_addr_index:
341 debug_info_data.getULEB128(offset_ptr);
344 case DW_FORM_indirect:
346 form = debug_info_data.getULEB128(offset_ptr);
349 // FIXME: 4 for DWARF32, 8 for DWARF64.
350 case DW_FORM_sec_offset:
352 case DW_FORM_GNU_ref_alt:
353 case DW_FORM_GNU_strp_alt:
365 DWARFFormValue::dump(raw_ostream &OS, const DWARFUnit *cu) const {
366 uint64_t uvalue = Value.uval;
367 bool cu_relative_offset = false;
370 case DW_FORM_addr: OS << format("0x%016" PRIx64, uvalue); break;
371 case DW_FORM_GNU_addr_index: {
372 OS << format(" indexed (%8.8x) address = ", (uint32_t)uvalue);
374 if (cu->getAddrOffsetSectionItem(uvalue, Address))
375 OS << format("0x%016" PRIx64, Address);
377 OS << "<no .debug_addr section>";
380 case DW_FORM_flag_present: OS << "true"; break;
382 case DW_FORM_data1: OS << format("0x%02x", (uint8_t)uvalue); break;
383 case DW_FORM_data2: OS << format("0x%04x", (uint16_t)uvalue); break;
384 case DW_FORM_data4: OS << format("0x%08x", (uint32_t)uvalue); break;
385 case DW_FORM_ref_sig8:
386 case DW_FORM_data8: OS << format("0x%016" PRIx64, uvalue); break;
389 OS.write_escaped(Value.cstr);
392 case DW_FORM_exprloc:
399 case DW_FORM_exprloc:
400 case DW_FORM_block: OS << format("<0x%" PRIx64 "> ", uvalue); break;
401 case DW_FORM_block1: OS << format("<0x%2.2x> ", (uint8_t)uvalue); break;
402 case DW_FORM_block2: OS << format("<0x%4.4x> ", (uint16_t)uvalue); break;
403 case DW_FORM_block4: OS << format("<0x%8.8x> ", (uint32_t)uvalue); break;
407 const uint8_t* data_ptr = Value.data;
409 // uvalue contains size of block
410 const uint8_t* end_data_ptr = data_ptr + uvalue;
411 while (data_ptr < end_data_ptr) {
412 OS << format("%2.2x ", *data_ptr);
421 case DW_FORM_sdata: OS << Value.sval; break;
422 case DW_FORM_udata: OS << Value.uval; break;
424 OS << format(" .debug_str[0x%8.8x] = ", (uint32_t)uvalue);
428 case DW_FORM_GNU_str_index: {
429 OS << format(" indexed (%8.8x) string = ", (uint32_t)uvalue);
433 case DW_FORM_GNU_strp_alt: {
434 OS << format("alt indirect string, offset: 0x%" PRIx64 "", uvalue);
438 case DW_FORM_ref_addr:
439 OS << format("0x%016" PRIx64, uvalue);
442 cu_relative_offset = true;
443 OS << format("cu + 0x%2.2x", (uint8_t)uvalue);
446 cu_relative_offset = true;
447 OS << format("cu + 0x%4.4x", (uint16_t)uvalue);
450 cu_relative_offset = true;
451 OS << format("cu + 0x%4.4x", (uint32_t)uvalue);
454 cu_relative_offset = true;
455 OS << format("cu + 0x%8.8" PRIx64, uvalue);
457 case DW_FORM_ref_udata:
458 cu_relative_offset = true;
459 OS << format("cu + 0x%" PRIx64, uvalue);
461 case DW_FORM_GNU_ref_alt:
462 OS << format("<alt 0x%" PRIx64 ">", uvalue);
465 // All DW_FORM_indirect attributes should be resolved prior to calling
467 case DW_FORM_indirect:
468 OS << "DW_FORM_indirect";
471 // Should be formatted to 64-bit for DWARF64.
472 case DW_FORM_sec_offset:
473 OS << format("0x%08x", (uint32_t)uvalue);
477 OS << format("DW_FORM(0x%4.4x)", Form);
481 if (cu_relative_offset) {
483 WithColor(OS, syntax::Address).get()
484 << format("0x%8.8" PRIx64, uvalue + (cu ? cu->getOffset() : 0));
489 void DWARFFormValue::dumpString(raw_ostream &OS, const DWARFUnit *U) const {
490 Optional<const char *> DbgStr = getAsCString(U);
491 if (DbgStr.hasValue()) {
492 raw_ostream &COS = WithColor(OS, syntax::String);
494 COS.write_escaped(DbgStr.getValue());
499 Optional<const char *> DWARFFormValue::getAsCString(const DWARFUnit *U) const {
500 if (!isFormClass(FC_String))
502 if (Form == DW_FORM_string)
504 // FIXME: Add support for DW_FORM_GNU_strp_alt
505 if (Form == DW_FORM_GNU_strp_alt || U == nullptr)
507 uint32_t Offset = Value.uval;
508 if (Form == DW_FORM_GNU_str_index) {
510 if (!U->getStringOffsetSectionItem(Offset, StrOffset))
514 if (const char *Str = U->getStringExtractor().getCStr(&Offset)) {
520 Optional<uint64_t> DWARFFormValue::getAsAddress(const DWARFUnit *U) const {
521 if (!isFormClass(FC_Address))
523 if (Form == DW_FORM_GNU_addr_index) {
524 uint32_t Index = Value.uval;
526 if (!U || !U->getAddrOffsetSectionItem(Index, Result))
533 Optional<uint64_t> DWARFFormValue::getAsReference(const DWARFUnit *U) const {
534 if (!isFormClass(FC_Reference))
541 case DW_FORM_ref_udata:
544 return Value.uval + U->getOffset();
545 case DW_FORM_ref_addr:
547 // FIXME: Add proper support for DW_FORM_ref_sig8 and DW_FORM_GNU_ref_alt.
553 Optional<uint64_t> DWARFFormValue::getAsSectionOffset() const {
554 if (!isFormClass(FC_SectionOffset))
559 Optional<uint64_t> DWARFFormValue::getAsUnsignedConstant() const {
560 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag))
561 || Form == DW_FORM_sdata)
566 Optional<int64_t> DWARFFormValue::getAsSignedConstant() const {
567 if ((!isFormClass(FC_Constant) && !isFormClass(FC_Flag)) ||
568 (Form == DW_FORM_udata && uint64_t(LLONG_MAX) < Value.uval))
572 return int32_t(Value.uval);
574 return int16_t(Value.uval);
576 return int8_t(Value.uval);
584 Optional<ArrayRef<uint8_t>> DWARFFormValue::getAsBlock() const {
585 if (!isFormClass(FC_Block) && !isFormClass(FC_Exprloc))
587 return ArrayRef<uint8_t>(Value.data, Value.uval);