Bug Summary

File:lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
Warning:line 334, column 7
Value stored to 'length' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -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 -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/build-llvm/tools/clang/stage2-bins -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -isystem /usr/include/libxml2 -D HAVE_ROUND -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/lldb/source/Plugins/SymbolFile/DWARF -I /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/lldb/source/Plugins/SymbolFile/DWARF -I /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/lldb/include -I tools/lldb/include -I include -I /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/llvm/include -I /usr/include/python3.9 -I /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/clang/include -I tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/lldb/source -I tools/lldb/source -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-deprecated-register -Wno-vla-extension -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-01-25-232935-20746-1 -x c++ /build/llvm-toolchain-snapshot-14~++20220125101009+ceec4383681c/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
1//===-- DWARFUnit.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 "DWARFUnit.h"
10
11#include "lldb/Core/Module.h"
12#include "lldb/Symbol/ObjectFile.h"
13#include "lldb/Utility/LLDBAssert.h"
14#include "lldb/Utility/StreamString.h"
15#include "lldb/Utility/Timer.h"
16#include "llvm/Object/Error.h"
17
18#include "DWARFCompileUnit.h"
19#include "DWARFDebugAranges.h"
20#include "DWARFDebugInfo.h"
21#include "DWARFTypeUnit.h"
22#include "LogChannelDWARF.h"
23#include "SymbolFileDWARFDwo.h"
24
25using namespace lldb;
26using namespace lldb_private;
27using namespace std;
28
29extern int g_verbose;
30
31DWARFUnit::DWARFUnit(SymbolFileDWARF &dwarf, lldb::user_id_t uid,
32 const DWARFUnitHeader &header,
33 const DWARFAbbreviationDeclarationSet &abbrevs,
34 DIERef::Section section, bool is_dwo)
35 : UserID(uid), m_dwarf(dwarf), m_header(header), m_abbrevs(&abbrevs),
36 m_cancel_scopes(false), m_section(section), m_is_dwo(is_dwo),
37 m_has_parsed_non_skeleton_unit(false), m_dwo_id(header.GetDWOId()) {}
38
39DWARFUnit::~DWARFUnit() = default;
40
41// Parses first DIE of a compile unit, excluding DWO.
42void DWARFUnit::ExtractUnitDIENoDwoIfNeeded() {
43 {
44 llvm::sys::ScopedReader lock(m_first_die_mutex);
45 if (m_first_die)
46 return; // Already parsed
47 }
48 llvm::sys::ScopedWriter lock(m_first_die_mutex);
49 if (m_first_die)
50 return; // Already parsed
51
52 ElapsedTime elapsed(m_dwarf.GetDebugInfoParseTimeRef());
53 LLDB_SCOPED_TIMERF("%8.8x: DWARFUnit::ExtractUnitDIENoDwoIfNeeded()",static ::lldb_private::Timer::Category _cat(__PRETTY_FUNCTION__
); ::lldb_private::Timer _scoped_timer(_cat, "%8.8x: DWARFUnit::ExtractUnitDIENoDwoIfNeeded()"
, GetOffset())
54 GetOffset())static ::lldb_private::Timer::Category _cat(__PRETTY_FUNCTION__
); ::lldb_private::Timer _scoped_timer(_cat, "%8.8x: DWARFUnit::ExtractUnitDIENoDwoIfNeeded()"
, GetOffset())
;
55
56 // Set the offset to that of the first DIE and calculate the start of the
57 // next compilation unit header.
58 lldb::offset_t offset = GetFirstDIEOffset();
59
60 // We are in our compile unit, parse starting at the offset we were told to
61 // parse
62 const DWARFDataExtractor &data = GetData();
63 if (offset < GetNextUnitOffset() &&
64 m_first_die.Extract(data, this, &offset)) {
65 AddUnitDIE(m_first_die);
66 return;
67 }
68}
69
70// Parses first DIE of a compile unit including DWO.
71void DWARFUnit::ExtractUnitDIEIfNeeded() {
72 ExtractUnitDIENoDwoIfNeeded();
73
74 if (m_has_parsed_non_skeleton_unit)
75 return;
76
77 m_has_parsed_non_skeleton_unit = true;
78
79 std::shared_ptr<SymbolFileDWARFDwo> dwo_symbol_file =
80 m_dwarf.GetDwoSymbolFileForCompileUnit(*this, m_first_die);
81 if (!dwo_symbol_file)
82 return;
83
84 DWARFUnit *dwo_cu = dwo_symbol_file->GetDWOCompileUnitForHash(m_dwo_id);
85
86 if (!dwo_cu)
87 return; // Can't fetch the compile unit from the dwo file.
88 dwo_cu->SetUserData(this);
89
90 DWARFBaseDIE dwo_cu_die = dwo_cu->GetUnitDIEOnly();
91 if (!dwo_cu_die.IsValid())
92 return; // Can't fetch the compile unit DIE from the dwo file.
93
94 // Here for DWO CU we want to use the address base set in the skeleton unit
95 // (DW_AT_addr_base) if it is available and use the DW_AT_GNU_addr_base
96 // otherwise. We do that because pre-DWARF v5 could use the DW_AT_GNU_*
97 // attributes which were applicable to the DWO units. The corresponding
98 // DW_AT_* attributes standardized in DWARF v5 are also applicable to the
99 // main unit in contrast.
100 if (m_addr_base)
101 dwo_cu->SetAddrBase(*m_addr_base);
102 else if (m_gnu_addr_base)
103 dwo_cu->SetAddrBase(*m_gnu_addr_base);
104
105 if (GetVersion() <= 4 && m_gnu_ranges_base)
106 dwo_cu->SetRangesBase(*m_gnu_ranges_base);
107 else if (dwo_symbol_file->GetDWARFContext()
108 .getOrLoadRngListsData()
109 .GetByteSize() > 0)
110 dwo_cu->SetRangesBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
111
112 if (GetVersion() >= 5 &&
113 dwo_symbol_file->GetDWARFContext().getOrLoadLocListsData().GetByteSize() >
114 0)
115 dwo_cu->SetLoclistsBase(llvm::DWARFListTableHeader::getHeaderSize(DWARF32));
116
117 dwo_cu->SetBaseAddress(GetBaseAddress());
118
119 m_dwo = std::shared_ptr<DWARFUnit>(std::move(dwo_symbol_file), dwo_cu);
120}
121
122// Parses a compile unit and indexes its DIEs if it hasn't already been done.
123// It will leave this compile unit extracted forever.
124void DWARFUnit::ExtractDIEsIfNeeded() {
125 m_cancel_scopes = true;
126
127 {
128 llvm::sys::ScopedReader lock(m_die_array_mutex);
129 if (!m_die_array.empty())
130 return; // Already parsed
131 }
132 llvm::sys::ScopedWriter lock(m_die_array_mutex);
133 if (!m_die_array.empty())
134 return; // Already parsed
135
136 ExtractDIEsRWLocked();
137}
138
139// Parses a compile unit and indexes its DIEs if it hasn't already been done.
140// It will clear this compile unit after returned instance gets out of scope,
141// no other ScopedExtractDIEs instance is running for this compile unit
142// and no ExtractDIEsIfNeeded() has been executed during this ScopedExtractDIEs
143// lifetime.
144DWARFUnit::ScopedExtractDIEs DWARFUnit::ExtractDIEsScoped() {
145 ScopedExtractDIEs scoped(*this);
146
147 {
148 llvm::sys::ScopedReader lock(m_die_array_mutex);
149 if (!m_die_array.empty())
150 return scoped; // Already parsed
151 }
152 llvm::sys::ScopedWriter lock(m_die_array_mutex);
153 if (!m_die_array.empty())
154 return scoped; // Already parsed
155
156 // Otherwise m_die_array would be already populated.
157 lldbassert(!m_cancel_scopes)lldb_private::lldb_assert(static_cast<bool>(!m_cancel_scopes
), "!m_cancel_scopes", __FUNCTION__, "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp"
, 157)
;
158
159 ExtractDIEsRWLocked();
160 scoped.m_clear_dies = true;
161 return scoped;
162}
163
164DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(DWARFUnit &cu) : m_cu(&cu) {
165 m_cu->m_die_array_scoped_mutex.lock_shared();
166}
167
168DWARFUnit::ScopedExtractDIEs::~ScopedExtractDIEs() {
169 if (!m_cu)
170 return;
171 m_cu->m_die_array_scoped_mutex.unlock_shared();
172 if (!m_clear_dies || m_cu->m_cancel_scopes)
173 return;
174 // Be sure no other ScopedExtractDIEs is running anymore.
175 llvm::sys::ScopedWriter lock_scoped(m_cu->m_die_array_scoped_mutex);
176 llvm::sys::ScopedWriter lock(m_cu->m_die_array_mutex);
177 if (m_cu->m_cancel_scopes)
178 return;
179 m_cu->ClearDIEsRWLocked();
180}
181
182DWARFUnit::ScopedExtractDIEs::ScopedExtractDIEs(ScopedExtractDIEs &&rhs)
183 : m_cu(rhs.m_cu), m_clear_dies(rhs.m_clear_dies) {
184 rhs.m_cu = nullptr;
185}
186
187DWARFUnit::ScopedExtractDIEs &DWARFUnit::ScopedExtractDIEs::operator=(
188 DWARFUnit::ScopedExtractDIEs &&rhs) {
189 m_cu = rhs.m_cu;
190 rhs.m_cu = nullptr;
191 m_clear_dies = rhs.m_clear_dies;
192 return *this;
193}
194
195// Parses a compile unit and indexes its DIEs, m_die_array_mutex must be
196// held R/W and m_die_array must be empty.
197void DWARFUnit::ExtractDIEsRWLocked() {
198 llvm::sys::ScopedWriter first_die_lock(m_first_die_mutex);
199
200 ElapsedTime elapsed(m_dwarf.GetDebugInfoParseTimeRef());
201 LLDB_SCOPED_TIMERF("%8.8x: DWARFUnit::ExtractDIEsIfNeeded()", GetOffset())static ::lldb_private::Timer::Category _cat(__PRETTY_FUNCTION__
); ::lldb_private::Timer _scoped_timer(_cat, "%8.8x: DWARFUnit::ExtractDIEsIfNeeded()"
, GetOffset())
;
202
203 // Set the offset to that of the first DIE and calculate the start of the
204 // next compilation unit header.
205 lldb::offset_t offset = GetFirstDIEOffset();
206 lldb::offset_t next_cu_offset = GetNextUnitOffset();
207
208 DWARFDebugInfoEntry die;
209
210 uint32_t depth = 0;
211 // We are in our compile unit, parse starting at the offset we were told to
212 // parse
213 const DWARFDataExtractor &data = GetData();
214 std::vector<uint32_t> die_index_stack;
215 die_index_stack.reserve(32);
216 die_index_stack.push_back(0);
217 bool prev_die_had_children = false;
218 while (offset < next_cu_offset && die.Extract(data, this, &offset)) {
219 const bool null_die = die.IsNULL();
220 if (depth == 0) {
221 assert(m_die_array.empty() && "Compile unit DIE already added")(static_cast <bool> (m_die_array.empty() && "Compile unit DIE already added"
) ? void (0) : __assert_fail ("m_die_array.empty() && \"Compile unit DIE already added\""
, "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp", 221, __extension__
__PRETTY_FUNCTION__))
;
222
223 // The average bytes per DIE entry has been seen to be around 14-20 so
224 // lets pre-reserve half of that since we are now stripping the NULL
225 // tags.
226
227 // Only reserve the memory if we are adding children of the main
228 // compile unit DIE. The compile unit DIE is always the first entry, so
229 // if our size is 1, then we are adding the first compile unit child
230 // DIE and should reserve the memory.
231 m_die_array.reserve(GetDebugInfoSize() / 24);
232 m_die_array.push_back(die);
233
234 if (!m_first_die)
235 AddUnitDIE(m_die_array.front());
236
237 // With -fsplit-dwarf-inlining, clang will emit non-empty skeleton compile
238 // units. We are not able to access these DIE *and* the dwo file
239 // simultaneously. We also don't need to do that as the dwo file will
240 // contain a superset of information. So, we don't even attempt to parse
241 // any remaining DIEs.
242 if (m_dwo) {
243 m_die_array.front().SetHasChildren(false);
244 break;
245 }
246
247 } else {
248 if (null_die) {
249 if (prev_die_had_children) {
250 // This will only happen if a DIE says is has children but all it
251 // contains is a NULL tag. Since we are removing the NULL DIEs from
252 // the list (saves up to 25% in C++ code), we need a way to let the
253 // DIE know that it actually doesn't have children.
254 if (!m_die_array.empty())
255 m_die_array.back().SetHasChildren(false);
256 }
257 } else {
258 die.SetParentIndex(m_die_array.size() - die_index_stack[depth - 1]);
259
260 if (die_index_stack.back())
261 m_die_array[die_index_stack.back()].SetSiblingIndex(
262 m_die_array.size() - die_index_stack.back());
263
264 // Only push the DIE if it isn't a NULL DIE
265 m_die_array.push_back(die);
266 }
267 }
268
269 if (null_die) {
270 // NULL DIE.
271 if (!die_index_stack.empty())
272 die_index_stack.pop_back();
273
274 if (depth > 0)
275 --depth;
276 prev_die_had_children = false;
277 } else {
278 die_index_stack.back() = m_die_array.size() - 1;
279 // Normal DIE
280 const bool die_has_children = die.HasChildren();
281 if (die_has_children) {
282 die_index_stack.push_back(0);
283 ++depth;
284 }
285 prev_die_had_children = die_has_children;
286 }
287
288 if (depth == 0)
289 break; // We are done with this compile unit!
290 }
291
292 if (!m_die_array.empty()) {
293 // The last die cannot have children (if it did, it wouldn't be the last one).
294 // This only makes a difference for malformed dwarf that does not have a
295 // terminating null die.
296 m_die_array.back().SetHasChildren(false);
297
298 if (m_first_die) {
299 // Only needed for the assertion.
300 m_first_die.SetHasChildren(m_die_array.front().HasChildren());
301 lldbassert(m_first_die == m_die_array.front())lldb_private::lldb_assert(static_cast<bool>(m_first_die
== m_die_array.front()), "m_first_die == m_die_array.front()"
, __FUNCTION__, "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp"
, 301)
;
302 }
303 m_first_die = m_die_array.front();
304 }
305
306 m_die_array.shrink_to_fit();
307
308 if (m_dwo)
309 m_dwo->ExtractDIEsIfNeeded();
310}
311
312// This is used when a split dwarf is enabled.
313// A skeleton compilation unit may contain the DW_AT_str_offsets_base attribute
314// that points to the first string offset of the CU contribution to the
315// .debug_str_offsets. At the same time, the corresponding split debug unit also
316// may use DW_FORM_strx* forms pointing to its own .debug_str_offsets.dwo and
317// for that case, we should find the offset (skip the section header).
318void DWARFUnit::SetDwoStrOffsetsBase() {
319 lldb::offset_t baseOffset = 0;
320
321 if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
322 if (const auto *contribution =
323 entry->getContribution(llvm::DW_SECT_STR_OFFSETS))
324 baseOffset = contribution->Offset;
325 else
326 return;
327 }
328
329 if (GetVersion() >= 5) {
330 const DWARFDataExtractor &strOffsets =
331 GetSymbolFileDWARF().GetDWARFContext().getOrLoadStrOffsetsData();
332 uint64_t length = strOffsets.GetU32(&baseOffset);
333 if (length == 0xffffffff)
334 length = strOffsets.GetU64(&baseOffset);
Value stored to 'length' is never read
335
336 // Check version.
337 if (strOffsets.GetU16(&baseOffset) < 5)
338 return;
339
340 // Skip padding.
341 baseOffset += 2;
342 }
343
344 SetStrOffsetsBase(baseOffset);
345}
346
347uint64_t DWARFUnit::GetDWOId() {
348 ExtractUnitDIENoDwoIfNeeded();
349 return m_dwo_id;
350}
351
352// m_die_array_mutex must be already held as read/write.
353void DWARFUnit::AddUnitDIE(const DWARFDebugInfoEntry &cu_die) {
354 DWARFAttributes attributes;
355 size_t num_attributes = cu_die.GetAttributes(this, attributes);
356
357 // Extract DW_AT_addr_base first, as other attributes may need it.
358 for (size_t i = 0; i < num_attributes; ++i) {
359 if (attributes.AttributeAtIndex(i) != DW_AT_addr_base)
360 continue;
361 DWARFFormValue form_value;
362 if (attributes.ExtractFormValueAtIndex(i, form_value)) {
363 SetAddrBase(form_value.Unsigned());
364 break;
365 }
366 }
367
368 for (size_t i = 0; i < num_attributes; ++i) {
369 dw_attr_t attr = attributes.AttributeAtIndex(i);
370 DWARFFormValue form_value;
371 if (!attributes.ExtractFormValueAtIndex(i, form_value))
372 continue;
373 switch (attr) {
374 case DW_AT_loclists_base:
375 SetLoclistsBase(form_value.Unsigned());
376 break;
377 case DW_AT_rnglists_base:
378 SetRangesBase(form_value.Unsigned());
379 break;
380 case DW_AT_str_offsets_base:
381 SetStrOffsetsBase(form_value.Unsigned());
382 break;
383 case DW_AT_low_pc:
384 SetBaseAddress(form_value.Address());
385 break;
386 case DW_AT_entry_pc:
387 // If the value was already set by DW_AT_low_pc, don't update it.
388 if (m_base_addr == LLDB_INVALID_ADDRESS(18446744073709551615UL))
389 SetBaseAddress(form_value.Address());
390 break;
391 case DW_AT_stmt_list:
392 m_line_table_offset = form_value.Unsigned();
393 break;
394 case DW_AT_GNU_addr_base:
395 m_gnu_addr_base = form_value.Unsigned();
396 break;
397 case DW_AT_GNU_ranges_base:
398 m_gnu_ranges_base = form_value.Unsigned();
399 break;
400 case DW_AT_GNU_dwo_id:
401 m_dwo_id = form_value.Unsigned();
402 break;
403 }
404 }
405
406 if (m_is_dwo) {
407 m_has_parsed_non_skeleton_unit = true;
408 SetDwoStrOffsetsBase();
409 return;
410 }
411}
412
413size_t DWARFUnit::GetDebugInfoSize() const {
414 return GetLengthByteSize() + GetLength() - GetHeaderByteSize();
415}
416
417const DWARFAbbreviationDeclarationSet *DWARFUnit::GetAbbreviations() const {
418 return m_abbrevs;
419}
420
421dw_offset_t DWARFUnit::GetAbbrevOffset() const {
422 return m_abbrevs ? m_abbrevs->GetOffset() : DW_INVALID_OFFSET(~(dw_offset_t)0);
423}
424
425dw_offset_t DWARFUnit::GetLineTableOffset() {
426 ExtractUnitDIENoDwoIfNeeded();
427 return m_line_table_offset;
428}
429
430void DWARFUnit::SetAddrBase(dw_addr_t addr_base) { m_addr_base = addr_base; }
431
432// Parse the rangelist table header, including the optional array of offsets
433// following it (DWARF v5 and later).
434template <typename ListTableType>
435static llvm::Expected<ListTableType>
436ParseListTableHeader(const llvm::DWARFDataExtractor &data, uint64_t offset,
437 DwarfFormat format) {
438 // We are expected to be called with Offset 0 or pointing just past the table
439 // header. Correct Offset in the latter case so that it points to the start
440 // of the header.
441 if (offset == 0) {
442 // This means DW_AT_rnglists_base is missing and therefore DW_FORM_rnglistx
443 // cannot be handled. Returning a default-constructed ListTableType allows
444 // DW_FORM_sec_offset to be supported.
445 return ListTableType();
446 }
447
448 uint64_t HeaderSize = llvm::DWARFListTableHeader::getHeaderSize(format);
449 if (offset < HeaderSize)
450 return llvm::createStringError(errc::invalid_argument,
451 "did not detect a valid"
452 " list table with base = 0x%" PRIx64"l" "x" "\n",
453 offset);
454 offset -= HeaderSize;
455 ListTableType Table;
456 if (llvm::Error E = Table.extractHeaderAndOffsets(data, &offset))
457 return std::move(E);
458 return Table;
459}
460
461void DWARFUnit::SetLoclistsBase(dw_addr_t loclists_base) {
462 uint64_t offset = 0;
463 if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
464 const auto *contribution = entry->getContribution(llvm::DW_SECT_LOCLISTS);
465 if (!contribution) {
466 GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
467 "Failed to find location list contribution for CU with DWO Id "
468 "0x%" PRIx64"l" "x",
469 this->GetDWOId());
470 return;
471 }
472 offset += contribution->Offset;
473 }
474 m_loclists_base = loclists_base;
475
476 uint64_t header_size = llvm::DWARFListTableHeader::getHeaderSize(DWARF32);
477 if (loclists_base < header_size)
478 return;
479
480 m_loclist_table_header.emplace(".debug_loclists", "locations");
481 offset += loclists_base - header_size;
482 if (llvm::Error E = m_loclist_table_header->extract(
483 m_dwarf.GetDWARFContext().getOrLoadLocListsData().GetAsLLVM(),
484 &offset)) {
485 GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
486 "Failed to extract location list table at offset 0x%" PRIx64"l" "x"
487 " (location list base: 0x%" PRIx64"l" "x" "): %s",
488 offset, loclists_base, toString(std::move(E)).c_str());
489 }
490}
491
492std::unique_ptr<llvm::DWARFLocationTable>
493DWARFUnit::GetLocationTable(const DataExtractor &data) const {
494 llvm::DWARFDataExtractor llvm_data(
495 data.GetData(), data.GetByteOrder() == lldb::eByteOrderLittle,
496 data.GetAddressByteSize());
497
498 if (m_is_dwo || GetVersion() >= 5)
499 return std::make_unique<llvm::DWARFDebugLoclists>(llvm_data, GetVersion());
500 return std::make_unique<llvm::DWARFDebugLoc>(llvm_data);
501}
502
503DWARFDataExtractor DWARFUnit::GetLocationData() const {
504 DWARFContext &Ctx = GetSymbolFileDWARF().GetDWARFContext();
505 const DWARFDataExtractor &data =
506 GetVersion() >= 5 ? Ctx.getOrLoadLocListsData() : Ctx.getOrLoadLocData();
507 if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
508 if (const auto *contribution = entry->getContribution(
509 GetVersion() >= 5 ? llvm::DW_SECT_LOCLISTS : llvm::DW_SECT_EXT_LOC))
510 return DWARFDataExtractor(data, contribution->Offset,
511 contribution->Length);
512 return DWARFDataExtractor();
513 }
514 return data;
515}
516
517DWARFDataExtractor DWARFUnit::GetRnglistData() const {
518 DWARFContext &Ctx = GetSymbolFileDWARF().GetDWARFContext();
519 const DWARFDataExtractor &data = Ctx.getOrLoadRngListsData();
520 if (const llvm::DWARFUnitIndex::Entry *entry = m_header.GetIndexEntry()) {
521 if (const auto *contribution =
522 entry->getContribution(llvm::DW_SECT_RNGLISTS))
523 return DWARFDataExtractor(data, contribution->Offset,
524 contribution->Length);
525 GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
526 "Failed to find range list contribution for CU with signature "
527 "0x%" PRIx64"l" "x",
528 entry->getSignature());
529
530 return DWARFDataExtractor();
531 }
532 return data;
533}
534
535void DWARFUnit::SetRangesBase(dw_addr_t ranges_base) {
536 lldbassert(!m_rnglist_table_done)lldb_private::lldb_assert(static_cast<bool>(!m_rnglist_table_done
), "!m_rnglist_table_done", __FUNCTION__, "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp"
, 536)
;
537
538 m_ranges_base = ranges_base;
539}
540
541const llvm::Optional<llvm::DWARFDebugRnglistTable> &
542DWARFUnit::GetRnglistTable() {
543 if (GetVersion() >= 5 && !m_rnglist_table_done) {
544 m_rnglist_table_done = true;
545 if (auto table_or_error =
546 ParseListTableHeader<llvm::DWARFDebugRnglistTable>(
547 GetRnglistData().GetAsLLVM(), m_ranges_base, DWARF32))
548 m_rnglist_table = std::move(table_or_error.get());
549 else
550 GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
551 "Failed to extract range list table at offset 0x%" PRIx64"l" "x" ": %s",
552 m_ranges_base, toString(table_or_error.takeError()).c_str());
553 }
554 return m_rnglist_table;
555}
556
557// This function is called only for DW_FORM_rnglistx.
558llvm::Expected<uint64_t> DWARFUnit::GetRnglistOffset(uint32_t Index) {
559 if (!GetRnglistTable())
560 return llvm::createStringError(errc::invalid_argument,
561 "missing or invalid range list table");
562 if (!m_ranges_base)
563 return llvm::createStringError(errc::invalid_argument,
564 "DW_FORM_rnglistx cannot be used without "
565 "DW_AT_rnglists_base for CU at 0x%8.8x",
566 GetOffset());
567 if (llvm::Optional<uint64_t> off = GetRnglistTable()->getOffsetEntry(
568 GetRnglistData().GetAsLLVM(), Index))
569 return *off + m_ranges_base;
570 return llvm::createStringError(
571 errc::invalid_argument,
572 "invalid range list table index %u; OffsetEntryCount is %u, "
573 "DW_AT_rnglists_base is %" PRIu64"l" "u",
574 Index, GetRnglistTable()->getOffsetEntryCount(), m_ranges_base);
575}
576
577void DWARFUnit::SetStrOffsetsBase(dw_offset_t str_offsets_base) {
578 m_str_offsets_base = str_offsets_base;
579}
580
581// It may be called only with m_die_array_mutex held R/W.
582void DWARFUnit::ClearDIEsRWLocked() {
583 m_die_array.clear();
584 m_die_array.shrink_to_fit();
585
586 if (m_dwo)
587 m_dwo->ClearDIEsRWLocked();
588}
589
590lldb::ByteOrder DWARFUnit::GetByteOrder() const {
591 return m_dwarf.GetObjectFile()->GetByteOrder();
592}
593
594void DWARFUnit::SetBaseAddress(dw_addr_t base_addr) { m_base_addr = base_addr; }
595
596// Compare function DWARFDebugAranges::Range structures
597static bool CompareDIEOffset(const DWARFDebugInfoEntry &die,
598 const dw_offset_t die_offset) {
599 return die.GetOffset() < die_offset;
600}
601
602// GetDIE()
603//
604// Get the DIE (Debug Information Entry) with the specified offset by first
605// checking if the DIE is contained within this compile unit and grabbing the
606// DIE from this compile unit. Otherwise we grab the DIE from the DWARF file.
607DWARFDIE
608DWARFUnit::GetDIE(dw_offset_t die_offset) {
609 if (die_offset == DW_INVALID_OFFSET(~(dw_offset_t)0))
610 return DWARFDIE(); // Not found
611
612 if (!ContainsDIEOffset(die_offset)) {
613 GetSymbolFileDWARF().GetObjectFile()->GetModule()->ReportError(
614 "GetDIE for DIE 0x%" PRIx32"x" " is outside of its CU 0x%" PRIx32"x",
615 die_offset, GetOffset());
616 return DWARFDIE(); // Not found
617 }
618
619 ExtractDIEsIfNeeded();
620 DWARFDebugInfoEntry::const_iterator end = m_die_array.cend();
621 DWARFDebugInfoEntry::const_iterator pos =
622 lower_bound(m_die_array.cbegin(), end, die_offset, CompareDIEOffset);
623
624 if (pos != end && die_offset == (*pos).GetOffset())
625 return DWARFDIE(this, &(*pos));
626 return DWARFDIE(); // Not found
627}
628
629DWARFUnit &DWARFUnit::GetNonSkeletonUnit() {
630 ExtractUnitDIEIfNeeded();
631 if (m_dwo)
632 return *m_dwo;
633 return *this;
634}
635
636uint8_t DWARFUnit::GetAddressByteSize(const DWARFUnit *cu) {
637 if (cu)
638 return cu->GetAddressByteSize();
639 return DWARFUnit::GetDefaultAddressSize();
640}
641
642uint8_t DWARFUnit::GetDefaultAddressSize() { return 4; }
643
644void *DWARFUnit::GetUserData() const { return m_user_data; }
645
646void DWARFUnit::SetUserData(void *d) { m_user_data = d; }
647
648bool DWARFUnit::Supports_DW_AT_APPLE_objc_complete_type() {
649 return GetProducer() != eProducerLLVMGCC;
650}
651
652bool DWARFUnit::DW_AT_decl_file_attributes_are_invalid() {
653 // llvm-gcc makes completely invalid decl file attributes and won't ever be
654 // fixed, so we need to know to ignore these.
655 return GetProducer() == eProducerLLVMGCC;
656}
657
658bool DWARFUnit::Supports_unnamed_objc_bitfields() {
659 if (GetProducer() == eProducerClang)
660 return GetProducerVersion() >= llvm::VersionTuple(425, 0, 13);
661 // Assume all other compilers didn't have incorrect ObjC bitfield info.
662 return true;
663}
664
665void DWARFUnit::ParseProducerInfo() {
666 m_producer = eProducerOther;
667 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
668 if (!die)
669 return;
670
671 llvm::StringRef producer(
672 die->GetAttributeValueAsString(this, DW_AT_producer, nullptr));
673 if (producer.empty())
674 return;
675
676 static const RegularExpression g_swiftlang_version_regex(
677 llvm::StringRef(R"(swiftlang-([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?))"));
678 static const RegularExpression g_clang_version_regex(
679 llvm::StringRef(R"(clang-([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?))"));
680 static const RegularExpression g_llvm_gcc_regex(
681 llvm::StringRef(R"(4\.[012]\.[01] )"
682 R"(\(Based on Apple Inc\. build [0-9]+\) )"
683 R"(\(LLVM build [\.0-9]+\)$)"));
684
685 llvm::SmallVector<llvm::StringRef, 3> matches;
686 if (g_swiftlang_version_regex.Execute(producer, &matches)) {
687 m_producer_version.tryParse(matches[1]);
688 m_producer = eProducerSwift;
689 } else if (producer.contains("clang")) {
690 if (g_clang_version_regex.Execute(producer, &matches))
691 m_producer_version.tryParse(matches[1]);
692 m_producer = eProducerClang;
693 } else if (producer.contains("GNU")) {
694 m_producer = eProducerGCC;
695 } else if (g_llvm_gcc_regex.Execute(producer)) {
696 m_producer = eProducerLLVMGCC;
697 }
698}
699
700DWARFProducer DWARFUnit::GetProducer() {
701 if (m_producer == eProducerInvalid)
702 ParseProducerInfo();
703 return m_producer;
704}
705
706llvm::VersionTuple DWARFUnit::GetProducerVersion() {
707 if (m_producer_version.empty())
708 ParseProducerInfo();
709 return m_producer_version;
710}
711
712uint64_t DWARFUnit::GetDWARFLanguageType() {
713 if (m_language_type)
714 return *m_language_type;
715
716 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
717 if (!die)
718 m_language_type = 0;
719 else
720 m_language_type = die->GetAttributeValueAsUnsigned(this, DW_AT_language, 0);
721 return *m_language_type;
722}
723
724bool DWARFUnit::GetIsOptimized() {
725 if (m_is_optimized == eLazyBoolCalculate) {
726 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
727 if (die) {
728 m_is_optimized = eLazyBoolNo;
729 if (die->GetAttributeValueAsUnsigned(this, DW_AT_APPLE_optimized, 0) ==
730 1) {
731 m_is_optimized = eLazyBoolYes;
732 }
733 }
734 }
735 return m_is_optimized == eLazyBoolYes;
736}
737
738FileSpec::Style DWARFUnit::GetPathStyle() {
739 if (!m_comp_dir)
740 ComputeCompDirAndGuessPathStyle();
741 return m_comp_dir->GetPathStyle();
742}
743
744const FileSpec &DWARFUnit::GetCompilationDirectory() {
745 if (!m_comp_dir)
746 ComputeCompDirAndGuessPathStyle();
747 return *m_comp_dir;
748}
749
750const FileSpec &DWARFUnit::GetAbsolutePath() {
751 if (!m_file_spec)
752 ComputeAbsolutePath();
753 return *m_file_spec;
754}
755
756FileSpec DWARFUnit::GetFile(size_t file_idx) {
757 return m_dwarf.GetFile(*this, file_idx);
758}
759
760// DWARF2/3 suggests the form hostname:pathname for compilation directory.
761// Remove the host part if present.
762static llvm::StringRef
763removeHostnameFromPathname(llvm::StringRef path_from_dwarf) {
764 if (!path_from_dwarf.contains(':'))
765 return path_from_dwarf;
766 llvm::StringRef host, path;
767 std::tie(host, path) = path_from_dwarf.split(':');
768
769 if (host.contains('/'))
770 return path_from_dwarf;
771
772 // check whether we have a windows path, and so the first character is a
773 // drive-letter not a hostname.
774 if (host.size() == 1 && llvm::isAlpha(host[0]) && path.startswith("\\"))
775 return path_from_dwarf;
776
777 return path;
778}
779
780void DWARFUnit::ComputeCompDirAndGuessPathStyle() {
781 m_comp_dir = FileSpec();
782 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
783 if (!die)
784 return;
785
786 llvm::StringRef comp_dir = removeHostnameFromPathname(
787 die->GetAttributeValueAsString(this, DW_AT_comp_dir, nullptr));
788 if (!comp_dir.empty()) {
789 FileSpec::Style comp_dir_style =
790 FileSpec::GuessPathStyle(comp_dir).getValueOr(FileSpec::Style::native);
791 m_comp_dir = FileSpec(comp_dir, comp_dir_style);
792 } else {
793 // Try to detect the style based on the DW_AT_name attribute, but just store
794 // the detected style in the m_comp_dir field.
795 const char *name =
796 die->GetAttributeValueAsString(this, DW_AT_name, nullptr);
797 m_comp_dir = FileSpec(
798 "", FileSpec::GuessPathStyle(name).getValueOr(FileSpec::Style::native));
799 }
800}
801
802void DWARFUnit::ComputeAbsolutePath() {
803 m_file_spec = FileSpec();
804 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
805 if (!die)
806 return;
807
808 m_file_spec =
809 FileSpec(die->GetAttributeValueAsString(this, DW_AT_name, nullptr),
810 GetPathStyle());
811
812 if (m_file_spec->IsRelative())
813 m_file_spec->MakeAbsolute(GetCompilationDirectory());
814}
815
816SymbolFileDWARFDwo *DWARFUnit::GetDwoSymbolFile() {
817 ExtractUnitDIEIfNeeded();
818 if (m_dwo)
819 return &llvm::cast<SymbolFileDWARFDwo>(m_dwo->GetSymbolFileDWARF());
820 return nullptr;
821}
822
823const DWARFDebugAranges &DWARFUnit::GetFunctionAranges() {
824 if (m_func_aranges_up == nullptr) {
825 m_func_aranges_up = std::make_unique<DWARFDebugAranges>();
826 const DWARFDebugInfoEntry *die = DIEPtr();
827 if (die)
828 die->BuildFunctionAddressRangeTable(this, m_func_aranges_up.get());
829
830 if (m_dwo) {
831 const DWARFDebugInfoEntry *dwo_die = m_dwo->DIEPtr();
832 if (dwo_die)
833 dwo_die->BuildFunctionAddressRangeTable(m_dwo.get(),
834 m_func_aranges_up.get());
835 }
836
837 const bool minimize = false;
838 m_func_aranges_up->Sort(minimize);
839 }
840 return *m_func_aranges_up;
841}
842
843llvm::Expected<DWARFUnitHeader>
844DWARFUnitHeader::extract(const DWARFDataExtractor &data,
845 DIERef::Section section,
846 lldb_private::DWARFContext &context,
847 lldb::offset_t *offset_ptr) {
848 DWARFUnitHeader header;
849 header.m_offset = *offset_ptr;
850 header.m_length = data.GetDWARFInitialLength(offset_ptr);
851 header.m_version = data.GetU16(offset_ptr);
852 if (header.m_version == 5) {
853 header.m_unit_type = data.GetU8(offset_ptr);
854 header.m_addr_size = data.GetU8(offset_ptr);
855 header.m_abbr_offset = data.GetDWARFOffset(offset_ptr);
856 if (header.m_unit_type == llvm::dwarf::DW_UT_skeleton ||
857 header.m_unit_type == llvm::dwarf::DW_UT_split_compile)
858 header.m_dwo_id = data.GetU64(offset_ptr);
859 } else {
860 header.m_abbr_offset = data.GetDWARFOffset(offset_ptr);
861 header.m_addr_size = data.GetU8(offset_ptr);
862 header.m_unit_type =
863 section == DIERef::Section::DebugTypes ? DW_UT_type : DW_UT_compile;
864 }
865
866 if (context.isDwo()) {
867 if (header.IsTypeUnit()) {
868 header.m_index_entry =
869 context.GetAsLLVM().getTUIndex().getFromOffset(header.m_offset);
870 } else {
871 header.m_index_entry =
872 context.GetAsLLVM().getCUIndex().getFromOffset(header.m_offset);
873 }
874 }
875
876 if (header.m_index_entry) {
877 if (header.m_abbr_offset) {
878 return llvm::createStringError(
879 llvm::inconvertibleErrorCode(),
880 "Package unit with a non-zero abbreviation offset");
881 }
882 auto *unit_contrib = header.m_index_entry->getContribution();
883 if (!unit_contrib || unit_contrib->Length != header.m_length + 4) {
884 return llvm::createStringError(llvm::inconvertibleErrorCode(),
885 "Inconsistent DWARF package unit index");
886 }
887 auto *abbr_entry =
888 header.m_index_entry->getContribution(llvm::DW_SECT_ABBREV);
889 if (!abbr_entry) {
890 return llvm::createStringError(
891 llvm::inconvertibleErrorCode(),
892 "DWARF package index missing abbreviation column");
893 }
894 header.m_abbr_offset = abbr_entry->Offset;
895 }
896 if (header.IsTypeUnit()) {
897 header.m_type_hash = data.GetU64(offset_ptr);
898 header.m_type_offset = data.GetDWARFOffset(offset_ptr);
899 }
900
901 bool length_OK = data.ValidOffset(header.GetNextUnitOffset() - 1);
902 bool version_OK = SymbolFileDWARF::SupportedVersion(header.m_version);
903 bool addr_size_OK = (header.m_addr_size == 4) || (header.m_addr_size == 8);
904 bool type_offset_OK =
905 !header.IsTypeUnit() || (header.m_type_offset <= header.GetLength());
906
907 if (!length_OK)
908 return llvm::make_error<llvm::object::GenericBinaryError>(
909 "Invalid unit length");
910 if (!version_OK)
911 return llvm::make_error<llvm::object::GenericBinaryError>(
912 "Unsupported unit version");
913 if (!addr_size_OK)
914 return llvm::make_error<llvm::object::GenericBinaryError>(
915 "Invalid unit address size");
916 if (!type_offset_OK)
917 return llvm::make_error<llvm::object::GenericBinaryError>(
918 "Type offset out of range");
919
920 return header;
921}
922
923llvm::Expected<DWARFUnitSP>
924DWARFUnit::extract(SymbolFileDWARF &dwarf, user_id_t uid,
925 const DWARFDataExtractor &debug_info,
926 DIERef::Section section, lldb::offset_t *offset_ptr) {
927 assert(debug_info.ValidOffset(*offset_ptr))(static_cast <bool> (debug_info.ValidOffset(*offset_ptr
)) ? void (0) : __assert_fail ("debug_info.ValidOffset(*offset_ptr)"
, "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp", 927, __extension__
__PRETTY_FUNCTION__))
;
928
929 auto expected_header = DWARFUnitHeader::extract(
930 debug_info, section, dwarf.GetDWARFContext(), offset_ptr);
931 if (!expected_header)
932 return expected_header.takeError();
933
934 const DWARFDebugAbbrev *abbr = dwarf.DebugAbbrev();
935 if (!abbr)
936 return llvm::make_error<llvm::object::GenericBinaryError>(
937 "No debug_abbrev data");
938
939 bool abbr_offset_OK =
940 dwarf.GetDWARFContext().getOrLoadAbbrevData().ValidOffset(
941 expected_header->GetAbbrOffset());
942 if (!abbr_offset_OK)
943 return llvm::make_error<llvm::object::GenericBinaryError>(
944 "Abbreviation offset for unit is not valid");
945
946 const DWARFAbbreviationDeclarationSet *abbrevs =
947 abbr->GetAbbreviationDeclarationSet(expected_header->GetAbbrOffset());
948 if (!abbrevs)
949 return llvm::make_error<llvm::object::GenericBinaryError>(
950 "No abbrev exists at the specified offset.");
951
952 bool is_dwo = dwarf.GetDWARFContext().isDwo();
953 if (expected_header->IsTypeUnit())
954 return DWARFUnitSP(new DWARFTypeUnit(dwarf, uid, *expected_header, *abbrevs,
955 section, is_dwo));
956 return DWARFUnitSP(new DWARFCompileUnit(dwarf, uid, *expected_header,
957 *abbrevs, section, is_dwo));
958}
959
960const lldb_private::DWARFDataExtractor &DWARFUnit::GetData() const {
961 return m_section == DIERef::Section::DebugTypes
962 ? m_dwarf.GetDWARFContext().getOrLoadDebugTypesData()
963 : m_dwarf.GetDWARFContext().getOrLoadDebugInfoData();
964}
965
966uint32_t DWARFUnit::GetHeaderByteSize() const {
967 switch (m_header.GetUnitType()) {
968 case llvm::dwarf::DW_UT_compile:
969 case llvm::dwarf::DW_UT_partial:
970 return GetVersion() < 5 ? 11 : 12;
971 case llvm::dwarf::DW_UT_skeleton:
972 case llvm::dwarf::DW_UT_split_compile:
973 return 20;
974 case llvm::dwarf::DW_UT_type:
975 case llvm::dwarf::DW_UT_split_type:
976 return GetVersion() < 5 ? 23 : 24;
977 }
978 llvm_unreachable("invalid UnitType.")::llvm::llvm_unreachable_internal("invalid UnitType.", "lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp"
, 978)
;
979}
980
981llvm::Optional<uint64_t>
982DWARFUnit::GetStringOffsetSectionItem(uint32_t index) const {
983 offset_t offset = GetStrOffsetsBase() + index * 4;
984 return m_dwarf.GetDWARFContext().getOrLoadStrOffsetsData().GetU32(&offset);
985}
986
987llvm::Expected<DWARFRangeList>
988DWARFUnit::FindRnglistFromOffset(dw_offset_t offset) {
989 if (GetVersion() <= 4) {
990 const DWARFDebugRanges *debug_ranges = m_dwarf.GetDebugRanges();
991 if (!debug_ranges)
992 return llvm::make_error<llvm::object::GenericBinaryError>(
993 "No debug_ranges section");
994 DWARFRangeList ranges;
995 debug_ranges->FindRanges(this, offset, ranges);
996 return ranges;
997 }
998
999 if (!GetRnglistTable())
1000 return llvm::createStringError(errc::invalid_argument,
1001 "missing or invalid range list table");
1002
1003 llvm::DWARFDataExtractor data = GetRnglistData().GetAsLLVM();
1004
1005 // As DW_AT_rnglists_base may be missing we need to call setAddressSize.
1006 data.setAddressSize(m_header.GetAddressByteSize());
1007 auto range_list_or_error = GetRnglistTable()->findList(data, offset);
1008 if (!range_list_or_error)
1009 return range_list_or_error.takeError();
1010
1011 llvm::Expected<llvm::DWARFAddressRangesVector> llvm_ranges =
1012 range_list_or_error->getAbsoluteRanges(
1013 llvm::object::SectionedAddress{GetBaseAddress()},
1014 GetAddressByteSize(), [&](uint32_t index) {
1015 uint32_t index_size = GetAddressByteSize();
1016 dw_offset_t addr_base = GetAddrBase();
1017 lldb::offset_t offset = addr_base + index * index_size;
1018 return llvm::object::SectionedAddress{
1019 m_dwarf.GetDWARFContext().getOrLoadAddrData().GetMaxU64(
1020 &offset, index_size)};
1021 });
1022 if (!llvm_ranges)
1023 return llvm_ranges.takeError();
1024
1025 DWARFRangeList ranges;
1026 for (const llvm::DWARFAddressRange &llvm_range : *llvm_ranges) {
1027 ranges.Append(DWARFRangeList::Entry(llvm_range.LowPC,
1028 llvm_range.HighPC - llvm_range.LowPC));
1029 }
1030 return ranges;
1031}
1032
1033llvm::Expected<DWARFRangeList>
1034DWARFUnit::FindRnglistFromIndex(uint32_t index) {
1035 llvm::Expected<uint64_t> maybe_offset = GetRnglistOffset(index);
1036 if (!maybe_offset)
1037 return maybe_offset.takeError();
1038 return FindRnglistFromOffset(*maybe_offset);
1039}