Bug Summary

File:tools/llvm-cov/TestingSupport.cpp
Warning:line 404, column 10
Called C++ object pointer is null

Annotated Source Code

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/build/llvm-toolchain-snapshot-6.0~svn321639/tools/llvm-cov/TestingSupport.cpp

1//===- TestingSupport.cpp - Convert objects files into test files --------===//
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/Object/ObjectFile.h"
11#include "llvm/ProfileData/InstrProf.h"
12#include "llvm/Support/CommandLine.h"
13#include "llvm/Support/LEB128.h"
14#include "llvm/Support/raw_ostream.h"
15#include <functional>
16#include <system_error>
17
18using namespace llvm;
19using namespace object;
20
21int convertForTestingMain(int argc, const char *argv[]) {
22 cl::opt<std::string> InputSourceFile(cl::Positional, cl::Required,
23 cl::desc("<Source file>"));
24
25 cl::opt<std::string> OutputFilename(
26 "o", cl::Required,
27 cl::desc(
28 "File with the profile data obtained after an instrumented run"));
29
30 cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
31
32 auto ObjErr = llvm::object::ObjectFile::createObjectFile(InputSourceFile);
33 if (!ObjErr) {
1
Taking false branch
34 std::string Buf;
35 raw_string_ostream OS(Buf);
36 logAllUnhandledErrors(ObjErr.takeError(), OS, "");
37 OS.flush();
38 errs() << "error: " << Buf;
39 return 1;
40 }
41 ObjectFile *OF = ObjErr.get().getBinary();
42 auto BytesInAddress = OF->getBytesInAddress();
43 if (BytesInAddress != 8) {
2
Assuming 'BytesInAddress' is equal to 8
3
Taking false branch
44 errs() << "error: 64 bit binary expected\n";
45 return 1;
46 }
47
48 // Look for the sections that we are interested in.
49 int FoundSectionCount = 0;
50 SectionRef ProfileNames, CoverageMapping;
4
Calling defaulted default constructor for 'SectionRef'
6
Returning from default constructor for 'SectionRef'
51 auto ObjFormat = OF->getTripleObjectFormat();
52 for (const auto &Section : OF->sections()) {
53 StringRef Name;
54 if (Section.getName(Name))
7
Taking false branch
12
Taking false branch
55 return 1;
56 if (Name == llvm::getInstrProfSectionName(IPSK_name, ObjFormat,
8
Assuming the condition is false
9
Taking false branch
13
Assuming the condition is false
14
Taking false branch
57 /*AddSegmentInfo=*/false)) {
58 ProfileNames = Section;
59 } else if (Name == llvm::getInstrProfSectionName(
10
Assuming the condition is true
11
Taking true branch
15
Assuming the condition is true
16
Taking true branch
60 IPSK_covmap, ObjFormat, /*AddSegmentInfo=*/false)) {
61 CoverageMapping = Section;
62 } else
63 continue;
64 ++FoundSectionCount;
65 }
66 if (FoundSectionCount != 2)
17
Taking false branch
67 return 1;
68
69 // Get the contents of the given sections.
70 uint64_t ProfileNamesAddress = ProfileNames.getAddress();
18
Calling 'SectionRef::getAddress'
71 StringRef CoverageMappingData;
72 StringRef ProfileNamesData;
73 if (CoverageMapping.getContents(CoverageMappingData) ||
74 ProfileNames.getContents(ProfileNamesData))
75 return 1;
76
77 int FD;
78 if (auto Err =
79 sys::fs::openFileForWrite(OutputFilename, FD, sys::fs::F_None)) {
80 errs() << "error: " << Err.message() << "\n";
81 return 1;
82 }
83
84 raw_fd_ostream OS(FD, true);
85 OS << "llvmcovmtestdata";
86 encodeULEB128(ProfileNamesData.size(), OS);
87 encodeULEB128(ProfileNamesAddress, OS);
88 OS << ProfileNamesData;
89 // Coverage mapping data is expected to have an alignment of 8.
90 for (unsigned Pad = OffsetToAlignment(OS.tell(), 8); Pad; --Pad)
91 OS.write(uint8_t(0));
92 OS << CoverageMappingData;
93
94 return 0;
95}

/build/llvm-toolchain-snapshot-6.0~svn321639/include/llvm/Object/ObjectFile.h

1//===- ObjectFile.h - File format independent object file -------*- C++ -*-===//
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// This file declares a file format independent ObjectFile class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_OBJECT_OBJECTFILE_H
15#define LLVM_OBJECT_OBJECTFILE_H
16
17#include "llvm/ADT/StringRef.h"
18#include "llvm/ADT/Triple.h"
19#include "llvm/ADT/iterator_range.h"
20#include "llvm/BinaryFormat/Magic.h"
21#include "llvm/MC/SubtargetFeature.h"
22#include "llvm/Object/Binary.h"
23#include "llvm/Object/Error.h"
24#include "llvm/Object/SymbolicFile.h"
25#include "llvm/Support/Casting.h"
26#include "llvm/Support/Error.h"
27#include "llvm/Support/FileSystem.h"
28#include "llvm/Support/MemoryBuffer.h"
29#include <cassert>
30#include <cstdint>
31#include <memory>
32#include <system_error>
33
34namespace llvm {
35
36class ARMAttributeParser;
37
38namespace object {
39
40class COFFObjectFile;
41class MachOObjectFile;
42class ObjectFile;
43class SectionRef;
44class SymbolRef;
45class symbol_iterator;
46class WasmObjectFile;
47
48using section_iterator = content_iterator<SectionRef>;
49
50/// This is a value type class that represents a single relocation in the list
51/// of relocations in the object file.
52class RelocationRef {
53 DataRefImpl RelocationPimpl;
54 const ObjectFile *OwningObject = nullptr;
55
56public:
57 RelocationRef() = default;
58 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
59
60 bool operator==(const RelocationRef &Other) const;
61
62 void moveNext();
63
64 uint64_t getOffset() const;
65 symbol_iterator getSymbol() const;
66 uint64_t getType() const;
67
68 /// @brief Get a string that represents the type of this relocation.
69 ///
70 /// This is for display purposes only.
71 void getTypeName(SmallVectorImpl<char> &Result) const;
72
73 DataRefImpl getRawDataRefImpl() const;
74 const ObjectFile *getObject() const;
75};
76
77using relocation_iterator = content_iterator<RelocationRef>;
78
79/// This is a value type class that represents a single section in the list of
80/// sections in the object file.
81class SectionRef {
82 friend class SymbolRef;
83
84 DataRefImpl SectionPimpl;
85 const ObjectFile *OwningObject = nullptr;
5
Null pointer value stored to 'ProfileNames.OwningObject'
86
87public:
88 SectionRef() = default;
89 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
90
91 bool operator==(const SectionRef &Other) const;
92 bool operator!=(const SectionRef &Other) const;
93 bool operator<(const SectionRef &Other) const;
94
95 void moveNext();
96
97 std::error_code getName(StringRef &Result) const;
98 uint64_t getAddress() const;
99 uint64_t getIndex() const;
100 uint64_t getSize() const;
101 std::error_code getContents(StringRef &Result) const;
102
103 /// @brief Get the alignment of this section as the actual value (not log 2).
104 uint64_t getAlignment() const;
105
106 bool isCompressed() const;
107 bool isText() const;
108 bool isData() const;
109 bool isBSS() const;
110 bool isVirtual() const;
111 bool isBitcode() const;
112 bool isStripped() const;
113
114 bool containsSymbol(SymbolRef S) const;
115
116 relocation_iterator relocation_begin() const;
117 relocation_iterator relocation_end() const;
118 iterator_range<relocation_iterator> relocations() const {
119 return make_range(relocation_begin(), relocation_end());
120 }
121 section_iterator getRelocatedSection() const;
122
123 DataRefImpl getRawDataRefImpl() const;
124 const ObjectFile *getObject() const;
125};
126
127/// This is a value type class that represents a single symbol in the list of
128/// symbols in the object file.
129class SymbolRef : public BasicSymbolRef {
130 friend class SectionRef;
131
132public:
133 enum Type {
134 ST_Unknown, // Type not specified
135 ST_Data,
136 ST_Debug,
137 ST_File,
138 ST_Function,
139 ST_Other
140 };
141
142 SymbolRef() = default;
143 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
144 SymbolRef(const BasicSymbolRef &B) : BasicSymbolRef(B) {
145 assert(isa<ObjectFile>(BasicSymbolRef::getObject()))(static_cast <bool> (isa<ObjectFile>(BasicSymbolRef
::getObject())) ? void (0) : __assert_fail ("isa<ObjectFile>(BasicSymbolRef::getObject())"
, "/build/llvm-toolchain-snapshot-6.0~svn321639/include/llvm/Object/ObjectFile.h"
, 145, __extension__ __PRETTY_FUNCTION__))
;
146 }
147
148 Expected<StringRef> getName() const;
149 /// Returns the symbol virtual address (i.e. address at which it will be
150 /// mapped).
151 Expected<uint64_t> getAddress() const;
152
153 /// Return the value of the symbol depending on the object this can be an
154 /// offset or a virtual address.
155 uint64_t getValue() const;
156
157 /// @brief Get the alignment of this symbol as the actual value (not log 2).
158 uint32_t getAlignment() const;
159 uint64_t getCommonSize() const;
160 Expected<SymbolRef::Type> getType() const;
161
162 /// @brief Get section this symbol is defined in reference to. Result is
163 /// end_sections() if it is undefined or is an absolute symbol.
164 Expected<section_iterator> getSection() const;
165
166 const ObjectFile *getObject() const;
167};
168
169class symbol_iterator : public basic_symbol_iterator {
170public:
171 symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
172 symbol_iterator(const basic_symbol_iterator &B)
173 : basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
174 cast<ObjectFile>(B->getObject()))) {}
175
176 const SymbolRef *operator->() const {
177 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
178 return static_cast<const SymbolRef*>(&P);
179 }
180
181 const SymbolRef &operator*() const {
182 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
183 return static_cast<const SymbolRef&>(P);
184 }
185};
186
187/// This class is the base class for all object file types. Concrete instances
188/// of this object are created by createObjectFile, which figures out which type
189/// to create.
190class ObjectFile : public SymbolicFile {
191 virtual void anchor();
192
193protected:
194 ObjectFile(unsigned int Type, MemoryBufferRef Source);
195
196 const uint8_t *base() const {
197 return reinterpret_cast<const uint8_t *>(Data.getBufferStart());
198 }
199
200 // These functions are for SymbolRef to call internally. The main goal of
201 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
202 // entry in the memory mapped object file. SymbolPimpl cannot contain any
203 // virtual functions because then it could not point into the memory mapped
204 // file.
205 //
206 // Implementations assume that the DataRefImpl is valid and has not been
207 // modified externally. It's UB otherwise.
208 friend class SymbolRef;
209
210 virtual Expected<StringRef> getSymbolName(DataRefImpl Symb) const = 0;
211 std::error_code printSymbolName(raw_ostream &OS,
212 DataRefImpl Symb) const override;
213 virtual Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const = 0;
214 virtual uint64_t getSymbolValueImpl(DataRefImpl Symb) const = 0;
215 virtual uint32_t getSymbolAlignment(DataRefImpl Symb) const;
216 virtual uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const = 0;
217 virtual Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const = 0;
218 virtual Expected<section_iterator>
219 getSymbolSection(DataRefImpl Symb) const = 0;
220
221 // Same as above for SectionRef.
222 friend class SectionRef;
223
224 virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
225 virtual std::error_code getSectionName(DataRefImpl Sec,
226 StringRef &Res) const = 0;
227 virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0;
228 virtual uint64_t getSectionIndex(DataRefImpl Sec) const = 0;
229 virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0;
230 virtual std::error_code getSectionContents(DataRefImpl Sec,
231 StringRef &Res) const = 0;
232 virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0;
233 virtual bool isSectionCompressed(DataRefImpl Sec) const = 0;
234 virtual bool isSectionText(DataRefImpl Sec) const = 0;
235 virtual bool isSectionData(DataRefImpl Sec) const = 0;
236 virtual bool isSectionBSS(DataRefImpl Sec) const = 0;
237 // A section is 'virtual' if its contents aren't present in the object image.
238 virtual bool isSectionVirtual(DataRefImpl Sec) const = 0;
239 virtual bool isSectionBitcode(DataRefImpl Sec) const;
240 virtual bool isSectionStripped(DataRefImpl Sec) const;
241 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
242 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
243 virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
244
245 // Same as above for RelocationRef.
246 friend class RelocationRef;
247 virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
248 virtual uint64_t getRelocationOffset(DataRefImpl Rel) const = 0;
249 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
250 virtual uint64_t getRelocationType(DataRefImpl Rel) const = 0;
251 virtual void getRelocationTypeName(DataRefImpl Rel,
252 SmallVectorImpl<char> &Result) const = 0;
253
254 uint64_t getSymbolValue(DataRefImpl Symb) const;
255
256public:
257 ObjectFile() = delete;
258 ObjectFile(const ObjectFile &other) = delete;
259
260 uint64_t getCommonSymbolSize(DataRefImpl Symb) const {
261 assert(getSymbolFlags(Symb) & SymbolRef::SF_Common)(static_cast <bool> (getSymbolFlags(Symb) & SymbolRef
::SF_Common) ? void (0) : __assert_fail ("getSymbolFlags(Symb) & SymbolRef::SF_Common"
, "/build/llvm-toolchain-snapshot-6.0~svn321639/include/llvm/Object/ObjectFile.h"
, 261, __extension__ __PRETTY_FUNCTION__))
;
262 return getCommonSymbolSizeImpl(Symb);
263 }
264
265 using symbol_iterator_range = iterator_range<symbol_iterator>;
266 symbol_iterator_range symbols() const {
267 return symbol_iterator_range(symbol_begin(), symbol_end());
268 }
269
270 virtual section_iterator section_begin() const = 0;
271 virtual section_iterator section_end() const = 0;
272
273 using section_iterator_range = iterator_range<section_iterator>;
274 section_iterator_range sections() const {
275 return section_iterator_range(section_begin(), section_end());
276 }
277
278 /// @brief The number of bytes used to represent an address in this object
279 /// file format.
280 virtual uint8_t getBytesInAddress() const = 0;
281
282 virtual StringRef getFileFormatName() const = 0;
283 virtual Triple::ArchType getArch() const = 0;
284 virtual SubtargetFeatures getFeatures() const = 0;
285 virtual void setARMSubArch(Triple &TheTriple) const { }
286
287 /// @brief Create a triple from the data in this object file.
288 Triple makeTriple() const;
289
290 /// Returns platform-specific object flags, if any.
291 virtual std::error_code getPlatformFlags(unsigned &Result) const {
292 Result = 0;
293 return object_error::invalid_file_type;
294 }
295
296 virtual std::error_code
297 getBuildAttributes(ARMAttributeParser &Attributes) const {
298 return std::error_code();
299 }
300
301 /// Maps a debug section name to a standard DWARF section name.
302 virtual StringRef mapDebugSectionName(StringRef Name) const { return Name; }
303
304 /// True if this is a relocatable object (.o/.obj).
305 virtual bool isRelocatableObject() const = 0;
306
307 /// @returns Pointer to ObjectFile subclass to handle this type of object.
308 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
309 /// return true.
310 /// @brief Create ObjectFile from path.
311 static Expected<OwningBinary<ObjectFile>>
312 createObjectFile(StringRef ObjectPath);
313
314 static Expected<std::unique_ptr<ObjectFile>>
315 createObjectFile(MemoryBufferRef Object, llvm::file_magic Type);
316 static Expected<std::unique_ptr<ObjectFile>>
317 createObjectFile(MemoryBufferRef Object) {
318 return createObjectFile(Object, llvm::file_magic::unknown);
319 }
320
321 static bool classof(const Binary *v) {
322 return v->isObject();
323 }
324
325 static Expected<std::unique_ptr<COFFObjectFile>>
326 createCOFFObjectFile(MemoryBufferRef Object);
327
328 static Expected<std::unique_ptr<ObjectFile>>
329 createELFObjectFile(MemoryBufferRef Object);
330
331 static Expected<std::unique_ptr<MachOObjectFile>>
332 createMachOObjectFile(MemoryBufferRef Object,
333 uint32_t UniversalCputype = 0,
334 uint32_t UniversalIndex = 0);
335
336 static Expected<std::unique_ptr<WasmObjectFile>>
337 createWasmObjectFile(MemoryBufferRef Object);
338};
339
340// Inline function definitions.
341inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
342 : BasicSymbolRef(SymbolP, Owner) {}
343
344inline Expected<StringRef> SymbolRef::getName() const {
345 return getObject()->getSymbolName(getRawDataRefImpl());
346}
347
348inline Expected<uint64_t> SymbolRef::getAddress() const {
349 return getObject()->getSymbolAddress(getRawDataRefImpl());
350}
351
352inline uint64_t SymbolRef::getValue() const {
353 return getObject()->getSymbolValue(getRawDataRefImpl());
354}
355
356inline uint32_t SymbolRef::getAlignment() const {
357 return getObject()->getSymbolAlignment(getRawDataRefImpl());
358}
359
360inline uint64_t SymbolRef::getCommonSize() const {
361 return getObject()->getCommonSymbolSize(getRawDataRefImpl());
362}
363
364inline Expected<section_iterator> SymbolRef::getSection() const {
365 return getObject()->getSymbolSection(getRawDataRefImpl());
366}
367
368inline Expected<SymbolRef::Type> SymbolRef::getType() const {
369 return getObject()->getSymbolType(getRawDataRefImpl());
370}
371
372inline const ObjectFile *SymbolRef::getObject() const {
373 const SymbolicFile *O = BasicSymbolRef::getObject();
374 return cast<ObjectFile>(O);
375}
376
377/// SectionRef
378inline SectionRef::SectionRef(DataRefImpl SectionP,
379 const ObjectFile *Owner)
380 : SectionPimpl(SectionP)
381 , OwningObject(Owner) {}
382
383inline bool SectionRef::operator==(const SectionRef &Other) const {
384 return SectionPimpl == Other.SectionPimpl;
385}
386
387inline bool SectionRef::operator!=(const SectionRef &Other) const {
388 return SectionPimpl != Other.SectionPimpl;
389}
390
391inline bool SectionRef::operator<(const SectionRef &Other) const {
392 return SectionPimpl < Other.SectionPimpl;
393}
394
395inline void SectionRef::moveNext() {
396 return OwningObject->moveSectionNext(SectionPimpl);
397}
398
399inline std::error_code SectionRef::getName(StringRef &Result) const {
400 return OwningObject->getSectionName(SectionPimpl, Result);
401}
402
403inline uint64_t SectionRef::getAddress() const {
404 return OwningObject->getSectionAddress(SectionPimpl);
19
Called C++ object pointer is null
405}
406
407inline uint64_t SectionRef::getIndex() const {
408 return OwningObject->getSectionIndex(SectionPimpl);
409}
410
411inline uint64_t SectionRef::getSize() const {
412 return OwningObject->getSectionSize(SectionPimpl);
413}
414
415inline std::error_code SectionRef::getContents(StringRef &Result) const {
416 return OwningObject->getSectionContents(SectionPimpl, Result);
417}
418
419inline uint64_t SectionRef::getAlignment() const {
420 return OwningObject->getSectionAlignment(SectionPimpl);
421}
422
423inline bool SectionRef::isCompressed() const {
424 return OwningObject->isSectionCompressed(SectionPimpl);
425}
426
427inline bool SectionRef::isText() const {
428 return OwningObject->isSectionText(SectionPimpl);
429}
430
431inline bool SectionRef::isData() const {
432 return OwningObject->isSectionData(SectionPimpl);
433}
434
435inline bool SectionRef::isBSS() const {
436 return OwningObject->isSectionBSS(SectionPimpl);
437}
438
439inline bool SectionRef::isVirtual() const {
440 return OwningObject->isSectionVirtual(SectionPimpl);
441}
442
443inline bool SectionRef::isBitcode() const {
444 return OwningObject->isSectionBitcode(SectionPimpl);
445}
446
447inline bool SectionRef::isStripped() const {
448 return OwningObject->isSectionStripped(SectionPimpl);
449}
450
451inline relocation_iterator SectionRef::relocation_begin() const {
452 return OwningObject->section_rel_begin(SectionPimpl);
453}
454
455inline relocation_iterator SectionRef::relocation_end() const {
456 return OwningObject->section_rel_end(SectionPimpl);
457}
458
459inline section_iterator SectionRef::getRelocatedSection() const {
460 return OwningObject->getRelocatedSection(SectionPimpl);
461}
462
463inline DataRefImpl SectionRef::getRawDataRefImpl() const {
464 return SectionPimpl;
465}
466
467inline const ObjectFile *SectionRef::getObject() const {
468 return OwningObject;
469}
470
471/// RelocationRef
472inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
473 const ObjectFile *Owner)
474 : RelocationPimpl(RelocationP)
475 , OwningObject(Owner) {}
476
477inline bool RelocationRef::operator==(const RelocationRef &Other) const {
478 return RelocationPimpl == Other.RelocationPimpl;
479}
480
481inline void RelocationRef::moveNext() {
482 return OwningObject->moveRelocationNext(RelocationPimpl);
483}
484
485inline uint64_t RelocationRef::getOffset() const {
486 return OwningObject->getRelocationOffset(RelocationPimpl);
487}
488
489inline symbol_iterator RelocationRef::getSymbol() const {
490 return OwningObject->getRelocationSymbol(RelocationPimpl);
491}
492
493inline uint64_t RelocationRef::getType() const {
494 return OwningObject->getRelocationType(RelocationPimpl);
495}
496
497inline void RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
498 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
499}
500
501inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
502 return RelocationPimpl;
503}
504
505inline const ObjectFile *RelocationRef::getObject() const {
506 return OwningObject;
507}
508
509} // end namespace object
510
511} // end namespace llvm
512
513#endif // LLVM_OBJECT_OBJECTFILE_H