Bug Summary

File:llvm/lib/DebugInfo/GSYM/DwarfTransformer.cpp
Warning:line 36, column 15
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name DwarfTransformer.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/lib/DebugInfo/GSYM -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/lib/DebugInfo/GSYM -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/DebugInfo/GSYM -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/include -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 -O2 -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 -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/build-llvm/lib/DebugInfo/GSYM -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-08-28-193554-24367-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/DebugInfo/GSYM/DwarfTransformer.cpp
1//===- DwarfTransformer.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 <thread>
10#include <unordered_set>
11
12#include "llvm/DebugInfo/DIContext.h"
13#include "llvm/DebugInfo/DWARF/DWARFContext.h"
14#include "llvm/Support/Error.h"
15#include "llvm/Support/ThreadPool.h"
16#include "llvm/Support/raw_ostream.h"
17
18#include "llvm/DebugInfo/GSYM/DwarfTransformer.h"
19#include "llvm/DebugInfo/GSYM/FunctionInfo.h"
20#include "llvm/DebugInfo/GSYM/GsymCreator.h"
21#include "llvm/DebugInfo/GSYM/GsymReader.h"
22#include "llvm/DebugInfo/GSYM/InlineInfo.h"
23
24using namespace llvm;
25using namespace gsym;
26
27struct llvm::gsym::CUInfo {
28 const DWARFDebugLine::LineTable *LineTable;
29 const char *CompDir;
30 std::vector<uint32_t> FileCache;
31 uint64_t Language = 0;
32 uint8_t AddrSize = 0;
33
34 CUInfo(DWARFContext &DICtx, DWARFCompileUnit *CU) {
35 LineTable = DICtx.getLineTableForUnit(CU);
36 CompDir = CU->getCompilationDir();
6
←
Called C++ object pointer is null
37 FileCache.clear();
38 if (LineTable)
39 FileCache.assign(LineTable->Prologue.FileNames.size() + 1, UINT32_MAX(4294967295U));
40 DWARFDie Die = CU->getUnitDIE();
41 Language = dwarf::toUnsigned(Die.find(dwarf::DW_AT_language), 0);
42 AddrSize = CU->getAddressByteSize();
43 }
44
45 /// Return true if Addr is the highest address for a given compile unit. The
46 /// highest address is encoded as -1, of all ones in the address. These high
47 /// addresses are used by some linkers to indicate that a function has been
48 /// dead stripped or didn't end up in the linked executable.
49 bool isHighestAddress(uint64_t Addr) const {
50 if (AddrSize == 4)
51 return Addr == UINT32_MAX(4294967295U);
52 else if (AddrSize == 8)
53 return Addr == UINT64_MAX(18446744073709551615UL);
54 return false;
55 }
56
57 /// Convert a DWARF compile unit file index into a GSYM global file index.
58 ///
59 /// Each compile unit in DWARF has its own file table in the line table
60 /// prologue. GSYM has a single large file table that applies to all files
61 /// from all of the info in a GSYM file. This function converts between the
62 /// two and caches and DWARF CU file index that has already been converted so
63 /// the first client that asks for a compile unit file index will end up
64 /// doing the conversion, and subsequent clients will get the cached GSYM
65 /// index.
66 uint32_t DWARFToGSYMFileIndex(GsymCreator &Gsym, uint32_t DwarfFileIdx) {
67 if (!LineTable)
68 return 0;
69 assert(DwarfFileIdx < FileCache.size())(static_cast <bool> (DwarfFileIdx < FileCache.size()
) ? void (0) : __assert_fail ("DwarfFileIdx < FileCache.size()"
, "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/DebugInfo/GSYM/DwarfTransformer.cpp"
, 69, __extension__ __PRETTY_FUNCTION__));
70 uint32_t &GsymFileIdx = FileCache[DwarfFileIdx];
71 if (GsymFileIdx != UINT32_MAX(4294967295U))
72 return GsymFileIdx;
73 std::string File;
74 if (LineTable->getFileNameByIndex(
75 DwarfFileIdx, CompDir,
76 DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, File))
77 GsymFileIdx = Gsym.insertFile(File);
78 else
79 GsymFileIdx = 0;
80 return GsymFileIdx;
81 }
82};
83
84
85static DWARFDie GetParentDeclContextDIE(DWARFDie &Die) {
86 if (DWARFDie SpecDie =
87 Die.getAttributeValueAsReferencedDie(dwarf::DW_AT_specification)) {
88 if (DWARFDie SpecParent = GetParentDeclContextDIE(SpecDie))
89 return SpecParent;
90 }
91 if (DWARFDie AbstDie =
92 Die.getAttributeValueAsReferencedDie(dwarf::DW_AT_abstract_origin)) {
93 if (DWARFDie AbstParent = GetParentDeclContextDIE(AbstDie))
94 return AbstParent;
95 }
96
97 // We never want to follow parent for inlined subroutine - that would
98 // give us information about where the function is inlined, not what
99 // function is inlined
100 if (Die.getTag() == dwarf::DW_TAG_inlined_subroutine)
101 return DWARFDie();
102
103 DWARFDie ParentDie = Die.getParent();
104 if (!ParentDie)
105 return DWARFDie();
106
107 switch (ParentDie.getTag()) {
108 case dwarf::DW_TAG_namespace:
109 case dwarf::DW_TAG_structure_type:
110 case dwarf::DW_TAG_union_type:
111 case dwarf::DW_TAG_class_type:
112 case dwarf::DW_TAG_subprogram:
113 return ParentDie; // Found parent decl context DIE
114 case dwarf::DW_TAG_lexical_block:
115 return GetParentDeclContextDIE(ParentDie);
116 default:
117 break;
118 }
119
120 return DWARFDie();
121}
122
123/// Get the GsymCreator string table offset for the qualified name for the
124/// DIE passed in. This function will avoid making copies of any strings in
125/// the GsymCreator when possible. We don't need to copy a string when the
126/// string comes from our .debug_str section or is an inlined string in the
127/// .debug_info. If we create a qualified name string in this function by
128/// combining multiple strings in the DWARF string table or info, we will make
129/// a copy of the string when we add it to the string table.
130static Optional<uint32_t> getQualifiedNameIndex(DWARFDie &Die,
131 uint64_t Language,
132 GsymCreator &Gsym) {
133 // If the dwarf has mangled name, use mangled name
134 if (auto LinkageName =
135 dwarf::toString(Die.findRecursively({dwarf::DW_AT_MIPS_linkage_name,
136 dwarf::DW_AT_linkage_name}),
137 nullptr))
138 return Gsym.insertString(LinkageName, /* Copy */ false);
139
140 StringRef ShortName(Die.getName(DINameKind::ShortName));
141 if (ShortName.empty())
142 return llvm::None;
143
144 // For C++ and ObjC, prepend names of all parent declaration contexts
145 if (!(Language == dwarf::DW_LANG_C_plus_plus ||
146 Language == dwarf::DW_LANG_C_plus_plus_03 ||
147 Language == dwarf::DW_LANG_C_plus_plus_11 ||
148 Language == dwarf::DW_LANG_C_plus_plus_14 ||
149 Language == dwarf::DW_LANG_ObjC_plus_plus ||
150 // This should not be needed for C, but we see C++ code marked as C
151 // in some binaries. This should hurt, so let's do it for C as well
152 Language == dwarf::DW_LANG_C))
153 return Gsym.insertString(ShortName, /* Copy */ false);
154
155 // Some GCC optimizations create functions with names ending with .isra.<num>
156 // or .part.<num> and those names are just DW_AT_name, not DW_AT_linkage_name
157 // If it looks like it could be the case, don't add any prefix
158 if (ShortName.startswith("_Z") &&
159 (ShortName.contains(".isra.") || ShortName.contains(".part.")))
160 return Gsym.insertString(ShortName, /* Copy */ false);
161
162 DWARFDie ParentDeclCtxDie = GetParentDeclContextDIE(Die);
163 if (ParentDeclCtxDie) {
164 std::string Name = ShortName.str();
165 while (ParentDeclCtxDie) {
166 StringRef ParentName(ParentDeclCtxDie.getName(DINameKind::ShortName));
167 if (!ParentName.empty()) {
168 // "lambda" names are wrapped in < >. Replace with { }
169 // to be consistent with demangled names and not to confuse with
170 // templates
171 if (ParentName.front() == '<' && ParentName.back() == '>')
172 Name = "{" + ParentName.substr(1, ParentName.size() - 2).str() + "}" +
173 "::" + Name;
174 else
175 Name = ParentName.str() + "::" + Name;
176 }
177 ParentDeclCtxDie = GetParentDeclContextDIE(ParentDeclCtxDie);
178 }
179 // Copy the name since we created a new name in a std::string.
180 return Gsym.insertString(Name, /* Copy */ true);
181 }
182 // Don't copy the name since it exists in the DWARF object file.
183 return Gsym.insertString(ShortName, /* Copy */ false);
184}
185
186static bool hasInlineInfo(DWARFDie Die, uint32_t Depth) {
187 bool CheckChildren = true;
188 switch (Die.getTag()) {
189 case dwarf::DW_TAG_subprogram:
190 // Don't look into functions within functions.
191 CheckChildren = Depth == 0;
192 break;
193 case dwarf::DW_TAG_inlined_subroutine:
194 return true;
195 default:
196 break;
197 }
198 if (!CheckChildren)
199 return false;
200 for (DWARFDie ChildDie : Die.children()) {
201 if (hasInlineInfo(ChildDie, Depth + 1))
202 return true;
203 }
204 return false;
205}
206
207static void parseInlineInfo(GsymCreator &Gsym, CUInfo &CUI, DWARFDie Die,
208 uint32_t Depth, FunctionInfo &FI,
209 InlineInfo &parent) {
210 if (!hasInlineInfo(Die, Depth))
211 return;
212
213 dwarf::Tag Tag = Die.getTag();
214 if (Tag == dwarf::DW_TAG_inlined_subroutine) {
215 // create new InlineInfo and append to parent.children
216 InlineInfo II;
217 DWARFAddressRange FuncRange =
218 DWARFAddressRange(FI.startAddress(), FI.endAddress());
219 Expected<DWARFAddressRangesVector> RangesOrError = Die.getAddressRanges();
220 if (RangesOrError) {
221 for (const DWARFAddressRange &Range : RangesOrError.get()) {
222 // Check that the inlined function is within the range of the function
223 // info, it might not be in case of split functions
224 if (FuncRange.LowPC <= Range.LowPC && Range.HighPC <= FuncRange.HighPC)
225 II.Ranges.insert(AddressRange(Range.LowPC, Range.HighPC));
226 }
227 }
228 if (II.Ranges.empty())
229 return;
230
231 if (auto NameIndex = getQualifiedNameIndex(Die, CUI.Language, Gsym))
232 II.Name = *NameIndex;
233 II.CallFile = CUI.DWARFToGSYMFileIndex(
234 Gsym, dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_file), 0));
235 II.CallLine = dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_line), 0);
236 // parse all children and append to parent
237 for (DWARFDie ChildDie : Die.children())
238 parseInlineInfo(Gsym, CUI, ChildDie, Depth + 1, FI, II);
239 parent.Children.emplace_back(std::move(II));
240 return;
241 }
242 if (Tag == dwarf::DW_TAG_subprogram || Tag == dwarf::DW_TAG_lexical_block) {
243 // skip this Die and just recurse down
244 for (DWARFDie ChildDie : Die.children())
245 parseInlineInfo(Gsym, CUI, ChildDie, Depth + 1, FI, parent);
246 }
247}
248
249static void convertFunctionLineTable(raw_ostream &Log, CUInfo &CUI,
250 DWARFDie Die, GsymCreator &Gsym,
251 FunctionInfo &FI) {
252 std::vector<uint32_t> RowVector;
253 const uint64_t StartAddress = FI.startAddress();
254 const uint64_t EndAddress = FI.endAddress();
255 const uint64_t RangeSize = EndAddress - StartAddress;
256 const object::SectionedAddress SecAddress{
257 StartAddress, object::SectionedAddress::UndefSection};
258
259
260 if (!CUI.LineTable->lookupAddressRange(SecAddress, RangeSize, RowVector)) {
261 // If we have a DW_TAG_subprogram but no line entries, fall back to using
262 // the DW_AT_decl_file an d DW_AT_decl_line if we have both attributes.
263 std::string FilePath = Die.getDeclFile(
264 DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath);
265 if (FilePath.empty())
266 return;
267 if (auto Line =
268 dwarf::toUnsigned(Die.findRecursively({dwarf::DW_AT_decl_line}))) {
269 LineEntry LE(StartAddress, Gsym.insertFile(FilePath), *Line);
270 FI.OptLineTable = LineTable();
271 FI.OptLineTable->push(LE);
272 }
273 return;
274 }
275
276 FI.OptLineTable = LineTable();
277 DWARFDebugLine::Row PrevRow;
278 for (uint32_t RowIndex : RowVector) {
279 // Take file number and line/column from the row.
280 const DWARFDebugLine::Row &Row = CUI.LineTable->Rows[RowIndex];
281 const uint32_t FileIdx = CUI.DWARFToGSYMFileIndex(Gsym, Row.File);
282 uint64_t RowAddress = Row.Address.Address;
283 // Watch out for a RowAddress that is in the middle of a line table entry
284 // in the DWARF. If we pass an address in between two line table entries
285 // we will get a RowIndex for the previous valid line table row which won't
286 // be contained in our function. This is usually a bug in the DWARF due to
287 // linker problems or LTO or other DWARF re-linking so it is worth emitting
288 // an error, but not worth stopping the creation of the GSYM.
289 if (!FI.Range.contains(RowAddress)) {
290 if (RowAddress < FI.Range.Start) {
291 Log << "error: DIE has a start address whose LowPC is between the "
292 "line table Row[" << RowIndex << "] with address "
293 << HEX64(RowAddress)llvm::format_hex(RowAddress, 18) << " and the next one.\n";
294 Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
295 RowAddress = FI.Range.Start;
296 } else {
297 continue;
298 }
299 }
300
301 LineEntry LE(RowAddress, FileIdx, Row.Line);
302 if (RowIndex != RowVector[0] && Row.Address < PrevRow.Address) {
303 // We have seen full duplicate line tables for functions in some
304 // DWARF files. Watch for those here by checking the the last
305 // row was the function's end address (HighPC) and that the
306 // current line table entry's address is the same as the first
307 // line entry we already have in our "function_info.Lines". If
308 // so break out after printing a warning.
309 auto FirstLE = FI.OptLineTable->first();
310 if (FirstLE && *FirstLE == LE) {
311 if (!Gsym.isQuiet()) {
312 Log << "warning: duplicate line table detected for DIE:\n";
313 Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
314 }
315 } else {
316 // Print out (ignore if os == nulls as this is expensive)
317 Log << "error: line table has addresses that do not "
318 << "monotonically increase:\n";
319 for (uint32_t RowIndex2 : RowVector) {
320 CUI.LineTable->Rows[RowIndex2].dump(Log);
321 }
322 Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
323 }
324 break;
325 }
326
327 // Skip multiple line entries for the same file and line.
328 auto LastLE = FI.OptLineTable->last();
329 if (LastLE && LastLE->File == FileIdx && LastLE->Line == Row.Line)
330 continue;
331 // Only push a row if it isn't an end sequence. End sequence markers are
332 // included for the last address in a function or the last contiguous
333 // address in a sequence.
334 if (Row.EndSequence) {
335 // End sequence means that the next line entry could have a lower address
336 // that the previous entries. So we clear the previous row so we don't
337 // trigger the line table error about address that do not monotonically
338 // increase.
339 PrevRow = DWARFDebugLine::Row();
340 } else {
341 FI.OptLineTable->push(LE);
342 PrevRow = Row;
343 }
344 }
345 // If not line table rows were added, clear the line table so we don't encode
346 // on in the GSYM file.
347 if (FI.OptLineTable->empty())
348 FI.OptLineTable = llvm::None;
349}
350
351void DwarfTransformer::handleDie(raw_ostream &OS, CUInfo &CUI, DWARFDie Die) {
352 switch (Die.getTag()) {
353 case dwarf::DW_TAG_subprogram: {
354 Expected<DWARFAddressRangesVector> RangesOrError = Die.getAddressRanges();
355 if (!RangesOrError) {
356 consumeError(RangesOrError.takeError());
357 break;
358 }
359 const DWARFAddressRangesVector &Ranges = RangesOrError.get();
360 if (Ranges.empty())
361 break;
362 auto NameIndex = getQualifiedNameIndex(Die, CUI.Language, Gsym);
363 if (!NameIndex) {
364 OS << "error: function at " << HEX64(Die.getOffset())llvm::format_hex(Die.getOffset(), 18)
365 << " has no name\n ";
366 Die.dump(OS, 0, DIDumpOptions::getForSingleDIE());
367 break;
368 }
369
370 // Create a function_info for each range
371 for (const DWARFAddressRange &Range : Ranges) {
372 // The low PC must be less than the high PC. Many linkers don't remove
373 // DWARF for functions that don't get linked into the final executable.
374 // If both the high and low pc have relocations, linkers will often set
375 // the address values for both to the same value to indicate the function
376 // has been remove. Other linkers have been known to set the one or both
377 // PC values to a UINT32_MAX for 4 byte addresses and UINT64_MAX for 8
378 // byte addresses to indicate the function isn't valid. The check below
379 // tries to watch for these cases and abort if it runs into them.
380 if (Range.LowPC >= Range.HighPC || CUI.isHighestAddress(Range.LowPC))
381 break;
382
383 // Many linkers can't remove DWARF and might set the LowPC to zero. Since
384 // high PC can be an offset from the low PC in more recent DWARF versions
385 // we need to watch for a zero'ed low pc which we do using
386 // ValidTextRanges below.
387 if (!Gsym.IsValidTextAddress(Range.LowPC)) {
388 // We expect zero and -1 to be invalid addresses in DWARF depending
389 // on the linker of the DWARF. This indicates a function was stripped
390 // and the debug info wasn't able to be stripped from the DWARF. If
391 // the LowPC isn't zero or -1, then we should emit an error.
392 if (Range.LowPC != 0) {
393 if (!Gsym.isQuiet()) {
394 // Unexpected invalid address, emit a warning
395 Log << "warning: DIE has an address range whose start address is "
396 "not in any executable sections ("
397 << *Gsym.GetValidTextRanges()
398 << ") and will not be processed:\n";
399 Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
400 }
401 }
402 break;
403 }
404
405 FunctionInfo FI;
406 FI.setStartAddress(Range.LowPC);
407 FI.setEndAddress(Range.HighPC);
408 FI.Name = *NameIndex;
409 if (CUI.LineTable) {
410 convertFunctionLineTable(OS, CUI, Die, Gsym, FI);
411 }
412 if (hasInlineInfo(Die, 0)) {
413 FI.Inline = InlineInfo();
414 FI.Inline->Name = *NameIndex;
415 FI.Inline->Ranges.insert(FI.Range);
416 parseInlineInfo(Gsym, CUI, Die, 0, FI, *FI.Inline);
417 }
418 Gsym.addFunctionInfo(std::move(FI));
419 }
420 } break;
421 default:
422 break;
423 }
424 for (DWARFDie ChildDie : Die.children())
425 handleDie(OS, CUI, ChildDie);
426}
427
428Error DwarfTransformer::convert(uint32_t NumThreads) {
429 size_t NumBefore = Gsym.getNumFunctionInfos();
430 if (NumThreads == 1) {
1
Assuming 'NumThreads' is equal to 1
→
2
←
Taking true branch
→
431 // Parse all DWARF data from this thread, use the same string/file table
432 // for everything
433 for (const auto &CU : DICtx.compile_units()) {
434 DWARFDie Die = CU->getUnitDIE(false);
435 CUInfo CUI(DICtx, dyn_cast<DWARFCompileUnit>(CU.get()));
3
←
Assuming the object is not a 'DWARFCompileUnit'
→
4
←
Passing null pointer value via 2nd parameter 'CU'
→
5
←
Calling constructor for 'CUInfo'
→
436 handleDie(Log, CUI, Die);
437 }
438 } else {
439 // LLVM Dwarf parser is not thread-safe and we need to parse all DWARF up
440 // front before we start accessing any DIEs since there might be
441 // cross compile unit references in the DWARF. If we don't do this we can
442 // end up crashing.
443
444 // We need to call getAbbreviations sequentially first so that getUnitDIE()
445 // only works with its local data.
446 for (const auto &CU : DICtx.compile_units())
447 CU->getAbbreviations();
448
449 // Now parse all DIEs in case we have cross compile unit references in a
450 // thread pool.
451 ThreadPool pool(hardware_concurrency(NumThreads));
452 for (const auto &CU : DICtx.compile_units())
453 pool.async([&CU]() { CU->getUnitDIE(false /*CUDieOnly*/); });
454 pool.wait();
455
456 // Now convert all DWARF to GSYM in a thread pool.
457 std::mutex LogMutex;
458 for (const auto &CU : DICtx.compile_units()) {
459 DWARFDie Die = CU->getUnitDIE(false /*CUDieOnly*/);
460 if (Die) {
461 CUInfo CUI(DICtx, dyn_cast<DWARFCompileUnit>(CU.get()));
462 pool.async([this, CUI, &LogMutex, Die]() mutable {
463 std::string ThreadLogStorage;
464 raw_string_ostream ThreadOS(ThreadLogStorage);
465 handleDie(ThreadOS, CUI, Die);
466 ThreadOS.flush();
467 if (!ThreadLogStorage.empty()) {
468 // Print ThreadLogStorage lines into an actual stream under a lock
469 std::lock_guard<std::mutex> guard(LogMutex);
470 Log << ThreadLogStorage;
471 }
472 });
473 }
474 }
475 pool.wait();
476 }
477 size_t FunctionsAddedCount = Gsym.getNumFunctionInfos() - NumBefore;
478 Log << "Loaded " << FunctionsAddedCount << " functions from DWARF.\n";
479 return Error::success();
480}
481
482llvm::Error DwarfTransformer::verify(StringRef GsymPath) {
483 Log << "Verifying GSYM file \"" << GsymPath << "\":\n";
484
485 auto Gsym = GsymReader::openFile(GsymPath);
486 if (!Gsym)
487 return Gsym.takeError();
488
489 auto NumAddrs = Gsym->getNumAddresses();
490 DILineInfoSpecifier DLIS(
491 DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
492 DILineInfoSpecifier::FunctionNameKind::LinkageName);
493 std::string gsymFilename;
494 for (uint32_t I = 0; I < NumAddrs; ++I) {
495 auto FuncAddr = Gsym->getAddress(I);
496 if (!FuncAddr)
497 return createStringError(std::errc::invalid_argument,
498 "failed to extract address[%i]", I);
499
500 auto FI = Gsym->getFunctionInfo(*FuncAddr);
501 if (!FI)
502 return createStringError(std::errc::invalid_argument,
503 "failed to extract function info for address 0x%"
504 PRIu64"l" "u", *FuncAddr);
505
506 for (auto Addr = *FuncAddr; Addr < *FuncAddr + FI->size(); ++Addr) {
507 const object::SectionedAddress SectAddr{
508 Addr, object::SectionedAddress::UndefSection};
509 auto LR = Gsym->lookup(Addr);
510 if (!LR)
511 return LR.takeError();
512
513 auto DwarfInlineInfos =
514 DICtx.getInliningInfoForAddress(SectAddr, DLIS);
515 uint32_t NumDwarfInlineInfos = DwarfInlineInfos.getNumberOfFrames();
516 if (NumDwarfInlineInfos == 0) {
517 DwarfInlineInfos.addFrame(
518 DICtx.getLineInfoForAddress(SectAddr, DLIS));
519 }
520
521 // Check for 1 entry that has no file and line info
522 if (NumDwarfInlineInfos == 1 &&
523 DwarfInlineInfos.getFrame(0).FileName == "<invalid>") {
524 DwarfInlineInfos = DIInliningInfo();
525 NumDwarfInlineInfos = 0;
526 }
527 if (NumDwarfInlineInfos > 0 &&
528 NumDwarfInlineInfos != LR->Locations.size()) {
529 Log << "error: address " << HEX64(Addr)llvm::format_hex(Addr, 18) << " has "
530 << NumDwarfInlineInfos << " DWARF inline frames and GSYM has "
531 << LR->Locations.size() << "\n";
532 Log << " " << NumDwarfInlineInfos << " DWARF frames:\n";
533 for (size_t Idx = 0; Idx < NumDwarfInlineInfos; ++Idx) {
534 const auto dii = DwarfInlineInfos.getFrame(Idx);
535 Log << " [" << Idx << "]: " << dii.FunctionName << " @ "
536 << dii.FileName << ':' << dii.Line << '\n';
537 }
538 Log << " " << LR->Locations.size() << " GSYM frames:\n";
539 for (size_t Idx = 0, count = LR->Locations.size();
540 Idx < count; ++Idx) {
541 const auto &gii = LR->Locations[Idx];
542 Log << " [" << Idx << "]: " << gii.Name << " @ " << gii.Dir
543 << '/' << gii.Base << ':' << gii.Line << '\n';
544 }
545 DwarfInlineInfos = DICtx.getInliningInfoForAddress(SectAddr, DLIS);
546 Gsym->dump(Log, *FI);
547 continue;
548 }
549
550 for (size_t Idx = 0, count = LR->Locations.size(); Idx < count;
551 ++Idx) {
552 const auto &gii = LR->Locations[Idx];
553 if (Idx < NumDwarfInlineInfos) {
554 const auto dii = DwarfInlineInfos.getFrame(Idx);
555 gsymFilename = LR->getSourceFile(Idx);
556 // Verify function name
557 if (dii.FunctionName.find(gii.Name.str()) != 0)
558 Log << "error: address " << HEX64(Addr)llvm::format_hex(Addr, 18) << " DWARF function \""
559 << dii.FunctionName.c_str()
560 << "\" doesn't match GSYM function \"" << gii.Name << "\"\n";
561 // Verify source file path
562 if (dii.FileName != gsymFilename)
563 Log << "error: address " << HEX64(Addr)llvm::format_hex(Addr, 18) << " DWARF path \""
564 << dii.FileName.c_str() << "\" doesn't match GSYM path \""
565 << gsymFilename.c_str() << "\"\n";
566 // Verify source file line
567 if (dii.Line != gii.Line)
568 Log << "error: address " << HEX64(Addr)llvm::format_hex(Addr, 18) << " DWARF line "
569 << dii.Line << " != GSYM line " << gii.Line << "\n";
570 }
571 }
572 }
573 }
574 return Error::success();
575}