Bug Summary

File:tools/llvm-cov/TestingSupport.cpp
Warning:line 403, column 10
Called C++ object pointer is null

Annotated Source Code

/build/llvm-toolchain-snapshot-6.0~svn318211/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~svn318211/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/iterator_range.h"
19#include "llvm/BinaryFormat/Magic.h"
20#include "llvm/MC/SubtargetFeature.h"
21#include "llvm/Object/Binary.h"
22#include "llvm/Object/Error.h"
23#include "llvm/Object/SymbolicFile.h"
24#include "llvm/Support/Casting.h"
25#include "llvm/Support/Error.h"
26#include "llvm/Support/FileSystem.h"
27#include "llvm/Support/MemoryBuffer.h"
28#include <cassert>
29#include <cstdint>
30#include <memory>
31#include <system_error>
32
33namespace llvm {
34
35class ARMAttributeParser;
36
37namespace object {
38
39class COFFObjectFile;
40class MachOObjectFile;
41class ObjectFile;
42class SectionRef;
43class SymbolRef;
44class symbol_iterator;
45class WasmObjectFile;
46
47using section_iterator = content_iterator<SectionRef>;
48
49/// This is a value type class that represents a single relocation in the list
50/// of relocations in the object file.
51class RelocationRef {
52 DataRefImpl RelocationPimpl;
53 const ObjectFile *OwningObject = nullptr;
54
55public:
56 RelocationRef() = default;
57 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
58
59 bool operator==(const RelocationRef &Other) const;
60
61 void moveNext();
62
63 uint64_t getOffset() const;
64 symbol_iterator getSymbol() const;
65 uint64_t getType() const;
66
67 /// @brief Get a string that represents the type of this relocation.
68 ///
69 /// This is for display purposes only.
70 void getTypeName(SmallVectorImpl<char> &Result) const;
71
72 DataRefImpl getRawDataRefImpl() const;
73 const ObjectFile *getObject() const;
74};
75
76using relocation_iterator = content_iterator<RelocationRef>;
77
78/// This is a value type class that represents a single section in the list of
79/// sections in the object file.
80class SectionRef {
81 friend class SymbolRef;
82
83 DataRefImpl SectionPimpl;
84 const ObjectFile *OwningObject = nullptr;
5
Null pointer value stored to 'ProfileNames.OwningObject'
85
86public:
87 SectionRef() = default;
88 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
89
90 bool operator==(const SectionRef &Other) const;
91 bool operator!=(const SectionRef &Other) const;
92 bool operator<(const SectionRef &Other) const;
93
94 void moveNext();
95
96 std::error_code getName(StringRef &Result) const;
97 uint64_t getAddress() const;
98 uint64_t getIndex() const;
99 uint64_t getSize() const;
100 std::error_code getContents(StringRef &Result) const;
101
102 /// @brief Get the alignment of this section as the actual value (not log 2).
103 uint64_t getAlignment() const;
104
105 bool isCompressed() const;
106 bool isText() const;
107 bool isData() const;
108 bool isBSS() const;
109 bool isVirtual() const;
110 bool isBitcode() const;
111 bool isStripped() const;
112
113 bool containsSymbol(SymbolRef S) const;
114
115 relocation_iterator relocation_begin() const;
116 relocation_iterator relocation_end() const;
117 iterator_range<relocation_iterator> relocations() const {
118 return make_range(relocation_begin(), relocation_end());
119 }
120 section_iterator getRelocatedSection() const;
121
122 DataRefImpl getRawDataRefImpl() const;
123 const ObjectFile *getObject() const;
124};
125
126/// This is a value type class that represents a single symbol in the list of
127/// symbols in the object file.
128class SymbolRef : public BasicSymbolRef {
129 friend class SectionRef;
130
131public:
132 enum Type {
133 ST_Unknown, // Type not specified
134 ST_Data,
135 ST_Debug,
136 ST_File,
137 ST_Function,
138 ST_Other
139 };
140
141 SymbolRef() = default;
142 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
143 SymbolRef(const BasicSymbolRef &B) : BasicSymbolRef(B) {
144 assert(isa<ObjectFile>(BasicSymbolRef::getObject()))((isa<ObjectFile>(BasicSymbolRef::getObject())) ? static_cast
<void> (0) : __assert_fail ("isa<ObjectFile>(BasicSymbolRef::getObject())"
, "/build/llvm-toolchain-snapshot-6.0~svn318211/include/llvm/Object/ObjectFile.h"
, 144, __PRETTY_FUNCTION__))
;
145 }
146
147 Expected<StringRef> getName() const;
148 /// Returns the symbol virtual address (i.e. address at which it will be
149 /// mapped).
150 Expected<uint64_t> getAddress() const;
151
152 /// Return the value of the symbol depending on the object this can be an
153 /// offset or a virtual address.
154 uint64_t getValue() const;
155
156 /// @brief Get the alignment of this symbol as the actual value (not log 2).
157 uint32_t getAlignment() const;
158 uint64_t getCommonSize() const;
159 Expected<SymbolRef::Type> getType() const;
160
161 /// @brief Get section this symbol is defined in reference to. Result is
162 /// end_sections() if it is undefined or is an absolute symbol.
163 Expected<section_iterator> getSection() const;
164
165 const ObjectFile *getObject() const;
166};
167
168class symbol_iterator : public basic_symbol_iterator {
169public:
170 symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
171 symbol_iterator(const basic_symbol_iterator &B)
172 : basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
173 cast<ObjectFile>(B->getObject()))) {}
174
175 const SymbolRef *operator->() const {
176 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
177 return static_cast<const SymbolRef*>(&P);
178 }
179
180 const SymbolRef &operator*() const {
181 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
182 return static_cast<const SymbolRef&>(P);
183 }
184};
185
186/// This class is the base class for all object file types. Concrete instances
187/// of this object are created by createObjectFile, which figures out which type
188/// to create.
189class ObjectFile : public SymbolicFile {
190 virtual void anchor();
191
192protected:
193 ObjectFile(unsigned int Type, MemoryBufferRef Source);
194
195 const uint8_t *base() const {
196 return reinterpret_cast<const uint8_t *>(Data.getBufferStart());
197 }
198
199 // These functions are for SymbolRef to call internally. The main goal of
200 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
201 // entry in the memory mapped object file. SymbolPimpl cannot contain any
202 // virtual functions because then it could not point into the memory mapped
203 // file.
204 //
205 // Implementations assume that the DataRefImpl is valid and has not been
206 // modified externally. It's UB otherwise.
207 friend class SymbolRef;
208
209 virtual Expected<StringRef> getSymbolName(DataRefImpl Symb) const = 0;
210 std::error_code printSymbolName(raw_ostream &OS,
211 DataRefImpl Symb) const override;
212 virtual Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const = 0;
213 virtual uint64_t getSymbolValueImpl(DataRefImpl Symb) const = 0;
214 virtual uint32_t getSymbolAlignment(DataRefImpl Symb) const;
215 virtual uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const = 0;
216 virtual Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const = 0;
217 virtual Expected<section_iterator>
218 getSymbolSection(DataRefImpl Symb) const = 0;
219
220 // Same as above for SectionRef.
221 friend class SectionRef;
222
223 virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
224 virtual std::error_code getSectionName(DataRefImpl Sec,
225 StringRef &Res) const = 0;
226 virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0;
227 virtual uint64_t getSectionIndex(DataRefImpl Sec) const = 0;
228 virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0;
229 virtual std::error_code getSectionContents(DataRefImpl Sec,
230 StringRef &Res) const = 0;
231 virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0;
232 virtual bool isSectionCompressed(DataRefImpl Sec) const = 0;
233 virtual bool isSectionText(DataRefImpl Sec) const = 0;
234 virtual bool isSectionData(DataRefImpl Sec) const = 0;
235 virtual bool isSectionBSS(DataRefImpl Sec) const = 0;
236 // A section is 'virtual' if its contents aren't present in the object image.
237 virtual bool isSectionVirtual(DataRefImpl Sec) const = 0;
238 virtual bool isSectionBitcode(DataRefImpl Sec) const;
239 virtual bool isSectionStripped(DataRefImpl Sec) const;
240 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
241 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
242 virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
243
244 // Same as above for RelocationRef.
245 friend class RelocationRef;
246 virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
247 virtual uint64_t getRelocationOffset(DataRefImpl Rel) const = 0;
248 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
249 virtual uint64_t getRelocationType(DataRefImpl Rel) const = 0;
250 virtual void getRelocationTypeName(DataRefImpl Rel,
251 SmallVectorImpl<char> &Result) const = 0;
252
253 uint64_t getSymbolValue(DataRefImpl Symb) const;
254
255public:
256 ObjectFile() = delete;
257 ObjectFile(const ObjectFile &other) = delete;
258
259 uint64_t getCommonSymbolSize(DataRefImpl Symb) const {
260 assert(getSymbolFlags(Symb) & SymbolRef::SF_Common)((getSymbolFlags(Symb) & SymbolRef::SF_Common) ? static_cast
<void> (0) : __assert_fail ("getSymbolFlags(Symb) & SymbolRef::SF_Common"
, "/build/llvm-toolchain-snapshot-6.0~svn318211/include/llvm/Object/ObjectFile.h"
, 260, __PRETTY_FUNCTION__))
;
261 return getCommonSymbolSizeImpl(Symb);
262 }
263
264 using symbol_iterator_range = iterator_range<symbol_iterator>;
265 symbol_iterator_range symbols() const {
266 return symbol_iterator_range(symbol_begin(), symbol_end());
267 }
268
269 virtual section_iterator section_begin() const = 0;
270 virtual section_iterator section_end() const = 0;
271
272 using section_iterator_range = iterator_range<section_iterator>;
273 section_iterator_range sections() const {
274 return section_iterator_range(section_begin(), section_end());
275 }
276
277 /// @brief The number of bytes used to represent an address in this object
278 /// file format.
279 virtual uint8_t getBytesInAddress() const = 0;
280
281 virtual StringRef getFileFormatName() const = 0;
282 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
283 virtual SubtargetFeatures getFeatures() const = 0;
284 virtual void setARMSubArch(Triple &TheTriple) const { }
285
286 /// @brief Create a triple from the data in this object file.
287 Triple makeTriple() const;
288
289 /// Returns platform-specific object flags, if any.
290 virtual std::error_code getPlatformFlags(unsigned &Result) const {
291 Result = 0;
292 return object_error::invalid_file_type;
293 }
294
295 virtual std::error_code
296 getBuildAttributes(ARMAttributeParser &Attributes) const {
297 return std::error_code();
298 }
299
300 /// Maps a debug section name to a standard DWARF section name.
301 virtual StringRef mapDebugSectionName(StringRef Name) const { return Name; }
302
303 /// True if this is a relocatable object (.o/.obj).
304 virtual bool isRelocatableObject() const = 0;
305
306 /// @returns Pointer to ObjectFile subclass to handle this type of object.
307 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
308 /// return true.
309 /// @brief Create ObjectFile from path.
310 static Expected<OwningBinary<ObjectFile>>
311 createObjectFile(StringRef ObjectPath);
312
313 static Expected<std::unique_ptr<ObjectFile>>
314 createObjectFile(MemoryBufferRef Object, llvm::file_magic Type);
315 static Expected<std::unique_ptr<ObjectFile>>
316 createObjectFile(MemoryBufferRef Object) {
317 return createObjectFile(Object, llvm::file_magic::unknown);
318 }
319
320 static bool classof(const Binary *v) {
321 return v->isObject();
322 }
323
324 static Expected<std::unique_ptr<COFFObjectFile>>
325 createCOFFObjectFile(MemoryBufferRef Object);
326
327 static Expected<std::unique_ptr<ObjectFile>>
328 createELFObjectFile(MemoryBufferRef Object);
329
330 static Expected<std::unique_ptr<MachOObjectFile>>
331 createMachOObjectFile(MemoryBufferRef Object,
332 uint32_t UniversalCputype = 0,
333 uint32_t UniversalIndex = 0);
334
335 static Expected<std::unique_ptr<WasmObjectFile>>
336 createWasmObjectFile(MemoryBufferRef Object);
337};
338
339// Inline function definitions.
340inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
341 : BasicSymbolRef(SymbolP, Owner) {}
342
343inline Expected<StringRef> SymbolRef::getName() const {
344 return getObject()->getSymbolName(getRawDataRefImpl());
345}
346
347inline Expected<uint64_t> SymbolRef::getAddress() const {
348 return getObject()->getSymbolAddress(getRawDataRefImpl());
349}
350
351inline uint64_t SymbolRef::getValue() const {
352 return getObject()->getSymbolValue(getRawDataRefImpl());
353}
354
355inline uint32_t SymbolRef::getAlignment() const {
356 return getObject()->getSymbolAlignment(getRawDataRefImpl());
357}
358
359inline uint64_t SymbolRef::getCommonSize() const {
360 return getObject()->getCommonSymbolSize(getRawDataRefImpl());
361}
362
363inline Expected<section_iterator> SymbolRef::getSection() const {
364 return getObject()->getSymbolSection(getRawDataRefImpl());
365}
366
367inline Expected<SymbolRef::Type> SymbolRef::getType() const {
368 return getObject()->getSymbolType(getRawDataRefImpl());
369}
370
371inline const ObjectFile *SymbolRef::getObject() const {
372 const SymbolicFile *O = BasicSymbolRef::getObject();
373 return cast<ObjectFile>(O);
374}
375
376/// SectionRef
377inline SectionRef::SectionRef(DataRefImpl SectionP,
378 const ObjectFile *Owner)
379 : SectionPimpl(SectionP)
380 , OwningObject(Owner) {}
381
382inline bool SectionRef::operator==(const SectionRef &Other) const {
383 return SectionPimpl == Other.SectionPimpl;
384}
385
386inline bool SectionRef::operator!=(const SectionRef &Other) const {
387 return SectionPimpl != Other.SectionPimpl;
388}
389
390inline bool SectionRef::operator<(const SectionRef &Other) const {
391 return SectionPimpl < Other.SectionPimpl;
392}
393
394inline void SectionRef::moveNext() {
395 return OwningObject->moveSectionNext(SectionPimpl);
396}
397
398inline std::error_code SectionRef::getName(StringRef &Result) const {
399 return OwningObject->getSectionName(SectionPimpl, Result);
400}
401
402inline uint64_t SectionRef::getAddress() const {
403 return OwningObject->getSectionAddress(SectionPimpl);
19
Called C++ object pointer is null
404}
405
406inline uint64_t SectionRef::getIndex() const {
407 return OwningObject->getSectionIndex(SectionPimpl);
408}
409
410inline uint64_t SectionRef::getSize() const {
411 return OwningObject->getSectionSize(SectionPimpl);
412}
413
414inline std::error_code SectionRef::getContents(StringRef &Result) const {
415 return OwningObject->getSectionContents(SectionPimpl, Result);
416}
417
418inline uint64_t SectionRef::getAlignment() const {
419 return OwningObject->getSectionAlignment(SectionPimpl);
420}
421
422inline bool SectionRef::isCompressed() const {
423 return OwningObject->isSectionCompressed(SectionPimpl);
424}
425
426inline bool SectionRef::isText() const {
427 return OwningObject->isSectionText(SectionPimpl);
428}
429
430inline bool SectionRef::isData() const {
431 return OwningObject->isSectionData(SectionPimpl);
432}
433
434inline bool SectionRef::isBSS() const {
435 return OwningObject->isSectionBSS(SectionPimpl);
436}
437
438inline bool SectionRef::isVirtual() const {
439 return OwningObject->isSectionVirtual(SectionPimpl);
440}
441
442inline bool SectionRef::isBitcode() const {
443 return OwningObject->isSectionBitcode(SectionPimpl);
444}
445
446inline bool SectionRef::isStripped() const {
447 return OwningObject->isSectionStripped(SectionPimpl);
448}
449
450inline relocation_iterator SectionRef::relocation_begin() const {
451 return OwningObject->section_rel_begin(SectionPimpl);
452}
453
454inline relocation_iterator SectionRef::relocation_end() const {
455 return OwningObject->section_rel_end(SectionPimpl);
456}
457
458inline section_iterator SectionRef::getRelocatedSection() const {
459 return OwningObject->getRelocatedSection(SectionPimpl);
460}
461
462inline DataRefImpl SectionRef::getRawDataRefImpl() const {
463 return SectionPimpl;
464}
465
466inline const ObjectFile *SectionRef::getObject() const {
467 return OwningObject;
468}
469
470/// RelocationRef
471inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
472 const ObjectFile *Owner)
473 : RelocationPimpl(RelocationP)
474 , OwningObject(Owner) {}
475
476inline bool RelocationRef::operator==(const RelocationRef &Other) const {
477 return RelocationPimpl == Other.RelocationPimpl;
478}
479
480inline void RelocationRef::moveNext() {
481 return OwningObject->moveRelocationNext(RelocationPimpl);
482}
483
484inline uint64_t RelocationRef::getOffset() const {
485 return OwningObject->getRelocationOffset(RelocationPimpl);
486}
487
488inline symbol_iterator RelocationRef::getSymbol() const {
489 return OwningObject->getRelocationSymbol(RelocationPimpl);
490}
491
492inline uint64_t RelocationRef::getType() const {
493 return OwningObject->getRelocationType(RelocationPimpl);
494}
495
496inline void RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
497 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
498}
499
500inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
501 return RelocationPimpl;
502}
503
504inline const ObjectFile *RelocationRef::getObject() const {
505 return OwningObject;
506}
507
508} // end namespace object
509
510} // end namespace llvm
511
512#endif // LLVM_OBJECT_OBJECTFILE_H