Bug Summary

File:src/gnu/usr.bin/clang/llvm-objdump/../../../llvm/llvm/tools/llvm-objdump/COFFDump.cpp
Warning:line 273, column 35
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name COFFDump.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 -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/llvm-objdump/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/llvm-objdump/obj/../include/llvm-objdump -I /usr/src/gnu/usr.bin/clang/llvm-objdump/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/llvm-objdump/../include -I /usr/src/gnu/usr.bin/clang/llvm-objdump/obj -I /usr/src/gnu/usr.bin/clang/llvm-objdump/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/llvm-objdump/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/llvm-objdump/../../../llvm/llvm/tools/llvm-objdump/COFFDump.cpp
1//===-- COFFDump.cpp - COFF-specific dumper ---------------------*- C++ -*-===//
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/// \file
10/// This file implements the COFF-specific dumper for llvm-objdump.
11/// It outputs the Win64 EH data structures as plain text.
12/// The encoding of the unwind codes is described in MSDN:
13/// http://msdn.microsoft.com/en-us/library/ck9asaa9.aspx
14///
15//===----------------------------------------------------------------------===//
16
17#include "COFFDump.h"
18
19#include "llvm-objdump.h"
20#include "llvm/Demangle/Demangle.h"
21#include "llvm/Object/COFF.h"
22#include "llvm/Object/COFFImportFile.h"
23#include "llvm/Object/ObjectFile.h"
24#include "llvm/Support/Format.h"
25#include "llvm/Support/Win64EH.h"
26#include "llvm/Support/WithColor.h"
27#include "llvm/Support/raw_ostream.h"
28
29using namespace llvm;
30using namespace llvm::objdump;
31using namespace llvm::object;
32using namespace llvm::Win64EH;
33
34// Returns the name of the unwind code.
35static StringRef getUnwindCodeTypeName(uint8_t Code) {
36 switch(Code) {
37 default: llvm_unreachable("Invalid unwind code")__builtin_unreachable();
38 case UOP_PushNonVol: return "UOP_PushNonVol";
39 case UOP_AllocLarge: return "UOP_AllocLarge";
40 case UOP_AllocSmall: return "UOP_AllocSmall";
41 case UOP_SetFPReg: return "UOP_SetFPReg";
42 case UOP_SaveNonVol: return "UOP_SaveNonVol";
43 case UOP_SaveNonVolBig: return "UOP_SaveNonVolBig";
44 case UOP_SaveXMM128: return "UOP_SaveXMM128";
45 case UOP_SaveXMM128Big: return "UOP_SaveXMM128Big";
46 case UOP_PushMachFrame: return "UOP_PushMachFrame";
47 }
48}
49
50// Returns the name of a referenced register.
51static StringRef getUnwindRegisterName(uint8_t Reg) {
52 switch(Reg) {
53 default: llvm_unreachable("Invalid register")__builtin_unreachable();
54 case 0: return "RAX";
55 case 1: return "RCX";
56 case 2: return "RDX";
57 case 3: return "RBX";
58 case 4: return "RSP";
59 case 5: return "RBP";
60 case 6: return "RSI";
61 case 7: return "RDI";
62 case 8: return "R8";
63 case 9: return "R9";
64 case 10: return "R10";
65 case 11: return "R11";
66 case 12: return "R12";
67 case 13: return "R13";
68 case 14: return "R14";
69 case 15: return "R15";
70 }
71}
72
73// Calculates the number of array slots required for the unwind code.
74static unsigned getNumUsedSlots(const UnwindCode &UnwindCode) {
75 switch (UnwindCode.getUnwindOp()) {
76 default: llvm_unreachable("Invalid unwind code")__builtin_unreachable();
77 case UOP_PushNonVol:
78 case UOP_AllocSmall:
79 case UOP_SetFPReg:
80 case UOP_PushMachFrame:
81 return 1;
82 case UOP_SaveNonVol:
83 case UOP_SaveXMM128:
84 return 2;
85 case UOP_SaveNonVolBig:
86 case UOP_SaveXMM128Big:
87 return 3;
88 case UOP_AllocLarge:
89 return (UnwindCode.getOpInfo() == 0) ? 2 : 3;
90 }
91}
92
93// Prints one unwind code. Because an unwind code can occupy up to 3 slots in
94// the unwind codes array, this function requires that the correct number of
95// slots is provided.
96static void printUnwindCode(ArrayRef<UnwindCode> UCs) {
97 assert(UCs.size() >= getNumUsedSlots(UCs[0]))((void)0);
98 outs() << format(" 0x%02x: ", unsigned(UCs[0].u.CodeOffset))
99 << getUnwindCodeTypeName(UCs[0].getUnwindOp());
100 switch (UCs[0].getUnwindOp()) {
101 case UOP_PushNonVol:
102 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo());
103 break;
104 case UOP_AllocLarge:
105 if (UCs[0].getOpInfo() == 0) {
106 outs() << " " << UCs[1].FrameOffset;
107 } else {
108 outs() << " " << UCs[1].FrameOffset
109 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16);
110 }
111 break;
112 case UOP_AllocSmall:
113 outs() << " " << ((UCs[0].getOpInfo() + 1) * 8);
114 break;
115 case UOP_SetFPReg:
116 outs() << " ";
117 break;
118 case UOP_SaveNonVol:
119 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
120 << format(" [0x%04x]", 8 * UCs[1].FrameOffset);
121 break;
122 case UOP_SaveNonVolBig:
123 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
124 << format(" [0x%08x]", UCs[1].FrameOffset
125 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
126 break;
127 case UOP_SaveXMM128:
128 outs() << " XMM" << static_cast<uint32_t>(UCs[0].getOpInfo())
129 << format(" [0x%04x]", 16 * UCs[1].FrameOffset);
130 break;
131 case UOP_SaveXMM128Big:
132 outs() << " XMM" << UCs[0].getOpInfo()
133 << format(" [0x%08x]", UCs[1].FrameOffset
134 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
135 break;
136 case UOP_PushMachFrame:
137 outs() << " " << (UCs[0].getOpInfo() ? "w/o" : "w")
138 << " error code";
139 break;
140 }
141 outs() << "\n";
142}
143
144static void printAllUnwindCodes(ArrayRef<UnwindCode> UCs) {
145 for (const UnwindCode *I = UCs.begin(), *E = UCs.end(); I < E; ) {
146 unsigned UsedSlots = getNumUsedSlots(*I);
147 if (UsedSlots > UCs.size()) {
148 outs() << "Unwind data corrupted: Encountered unwind op "
149 << getUnwindCodeTypeName((*I).getUnwindOp())
150 << " which requires " << UsedSlots
151 << " slots, but only " << UCs.size()
152 << " remaining in buffer";
153 return ;
154 }
155 printUnwindCode(makeArrayRef(I, E));
156 I += UsedSlots;
157 }
158}
159
160// Given a symbol sym this functions returns the address and section of it.
161static Error resolveSectionAndAddress(const COFFObjectFile *Obj,
162 const SymbolRef &Sym,
163 const coff_section *&ResolvedSection,
164 uint64_t &ResolvedAddr) {
165 Expected<uint64_t> ResolvedAddrOrErr = Sym.getAddress();
166 if (!ResolvedAddrOrErr)
167 return ResolvedAddrOrErr.takeError();
168 ResolvedAddr = *ResolvedAddrOrErr;
169 Expected<section_iterator> Iter = Sym.getSection();
170 if (!Iter)
171 return Iter.takeError();
172 ResolvedSection = Obj->getCOFFSection(**Iter);
173 return Error::success();
174}
175
176// Given a vector of relocations for a section and an offset into this section
177// the function returns the symbol used for the relocation at the offset.
178static Error resolveSymbol(const std::vector<RelocationRef> &Rels,
179 uint64_t Offset, SymbolRef &Sym) {
180 for (auto &R : Rels) {
181 uint64_t Ofs = R.getOffset();
182 if (Ofs == Offset) {
183 Sym = *R.getSymbol();
184 return Error::success();
185 }
186 }
187 return make_error<BinaryError>();
188}
189
190// Given a vector of relocations for a section and an offset into this section
191// the function resolves the symbol used for the relocation at the offset and
192// returns the section content and the address inside the content pointed to
193// by the symbol.
194static Error
195getSectionContents(const COFFObjectFile *Obj,
196 const std::vector<RelocationRef> &Rels, uint64_t Offset,
197 ArrayRef<uint8_t> &Contents, uint64_t &Addr) {
198 SymbolRef Sym;
199 if (Error E = resolveSymbol(Rels, Offset, Sym))
200 return E;
201 const coff_section *Section;
202 if (Error E = resolveSectionAndAddress(Obj, Sym, Section, Addr))
203 return E;
204 return Obj->getSectionContents(Section, Contents);
205}
206
207// Given a vector of relocations for a section and an offset into this section
208// the function returns the name of the symbol used for the relocation at the
209// offset.
210static Error resolveSymbolName(const std::vector<RelocationRef> &Rels,
211 uint64_t Offset, StringRef &Name) {
212 SymbolRef Sym;
213 if (Error EC = resolveSymbol(Rels, Offset, Sym))
214 return EC;
215 Expected<StringRef> NameOrErr = Sym.getName();
216 if (!NameOrErr)
217 return NameOrErr.takeError();
218 Name = *NameOrErr;
219 return Error::success();
220}
221
222static void printCOFFSymbolAddress(raw_ostream &Out,
223 const std::vector<RelocationRef> &Rels,
224 uint64_t Offset, uint32_t Disp) {
225 StringRef Sym;
226 if (!resolveSymbolName(Rels, Offset, Sym)) {
227 Out << Sym;
228 if (Disp > 0)
229 Out << format(" + 0x%04x", Disp);
230 } else {
231 Out << format("0x%04x", Disp);
232 }
233}
234
235static void
236printSEHTable(const COFFObjectFile *Obj, uint32_t TableVA, int Count) {
237 if (Count == 0)
238 return;
239
240 uintptr_t IntPtr = 0;
241 if (Error E = Obj->getVaPtr(TableVA, IntPtr))
242 reportError(std::move(E), Obj->getFileName());
243
244 const support::ulittle32_t *P = (const support::ulittle32_t *)IntPtr;
245 outs() << "SEH Table:";
246 for (int I = 0; I < Count; ++I)
247 outs() << format(" 0x%x", P[I] + Obj->getPE32Header()->ImageBase);
248 outs() << "\n\n";
249}
250
251template <typename T>
252static void printTLSDirectoryT(const coff_tls_directory<T> *TLSDir) {
253 size_t FormatWidth = sizeof(T) * 2;
254 outs() << "TLS directory:"
255 << "\n StartAddressOfRawData: "
256 << format_hex(TLSDir->StartAddressOfRawData, FormatWidth)
257 << "\n EndAddressOfRawData: "
258 << format_hex(TLSDir->EndAddressOfRawData, FormatWidth)
259 << "\n AddressOfIndex: "
260 << format_hex(TLSDir->AddressOfIndex, FormatWidth)
261 << "\n AddressOfCallBacks: "
262 << format_hex(TLSDir->AddressOfCallBacks, FormatWidth)
263 << "\n SizeOfZeroFill: "
264 << TLSDir->SizeOfZeroFill
265 << "\n Characteristics: "
266 << TLSDir->Characteristics
267 << "\n Alignment: "
268 << TLSDir->getAlignment()
269 << "\n\n";
270}
271
272static void printTLSDirectory(const COFFObjectFile *Obj) {
273 const pe32_header *PE32Header = Obj->getPE32Header();
5
←
Called C++ object pointer is null
274 const pe32plus_header *PE32PlusHeader = Obj->getPE32PlusHeader();
275
276 // Skip if it's not executable.
277 if (!PE32Header && !PE32PlusHeader)
278 return;
279
280 const data_directory *DataDir = Obj->getDataDirectory(COFF::TLS_TABLE);
281 if (!DataDir)
282 reportError("missing data dir for TLS table", Obj->getFileName());
283
284 if (DataDir->RelativeVirtualAddress == 0)
285 return;
286
287 uintptr_t IntPtr = 0;
288 if (Error E =
289 Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr))
290 reportError(std::move(E), Obj->getFileName());
291
292 if (PE32Header) {
293 auto *TLSDir = reinterpret_cast<const coff_tls_directory32 *>(IntPtr);
294 printTLSDirectoryT(TLSDir);
295 } else {
296 auto *TLSDir = reinterpret_cast<const coff_tls_directory64 *>(IntPtr);
297 printTLSDirectoryT(TLSDir);
298 }
299
300 outs() << "\n";
301}
302
303static void printLoadConfiguration(const COFFObjectFile *Obj) {
304 // Skip if it's not executable.
305 if (!Obj->getPE32Header())
306 return;
307
308 // Currently only x86 is supported
309 if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_I386)
310 return;
311
312 const data_directory *DataDir = Obj->getDataDirectory(COFF::LOAD_CONFIG_TABLE);
313 if (!DataDir)
314 reportError("no load config data dir", Obj->getFileName());
315
316 uintptr_t IntPtr = 0;
317 if (DataDir->RelativeVirtualAddress == 0)
318 return;
319
320 if (Error E =
321 Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr))
322 reportError(std::move(E), Obj->getFileName());
323
324 auto *LoadConf = reinterpret_cast<const coff_load_configuration32 *>(IntPtr);
325 outs() << "Load configuration:"
326 << "\n Timestamp: " << LoadConf->TimeDateStamp
327 << "\n Major Version: " << LoadConf->MajorVersion
328 << "\n Minor Version: " << LoadConf->MinorVersion
329 << "\n GlobalFlags Clear: " << LoadConf->GlobalFlagsClear
330 << "\n GlobalFlags Set: " << LoadConf->GlobalFlagsSet
331 << "\n Critical Section Default Timeout: " << LoadConf->CriticalSectionDefaultTimeout
332 << "\n Decommit Free Block Threshold: " << LoadConf->DeCommitFreeBlockThreshold
333 << "\n Decommit Total Free Threshold: " << LoadConf->DeCommitTotalFreeThreshold
334 << "\n Lock Prefix Table: " << LoadConf->LockPrefixTable
335 << "\n Maximum Allocation Size: " << LoadConf->MaximumAllocationSize
336 << "\n Virtual Memory Threshold: " << LoadConf->VirtualMemoryThreshold
337 << "\n Process Affinity Mask: " << LoadConf->ProcessAffinityMask
338 << "\n Process Heap Flags: " << LoadConf->ProcessHeapFlags
339 << "\n CSD Version: " << LoadConf->CSDVersion
340 << "\n Security Cookie: " << LoadConf->SecurityCookie
341 << "\n SEH Table: " << LoadConf->SEHandlerTable
342 << "\n SEH Count: " << LoadConf->SEHandlerCount
343 << "\n\n";
344 printSEHTable(Obj, LoadConf->SEHandlerTable, LoadConf->SEHandlerCount);
345 outs() << "\n";
346}
347
348// Prints import tables. The import table is a table containing the list of
349// DLL name and symbol names which will be linked by the loader.
350static void printImportTables(const COFFObjectFile *Obj) {
351 import_directory_iterator I = Obj->import_directory_begin();
352 import_directory_iterator E = Obj->import_directory_end();
353 if (I == E)
354 return;
355 outs() << "The Import Tables:\n";
356 for (const ImportDirectoryEntryRef &DirRef : Obj->import_directories()) {
357 const coff_import_directory_table_entry *Dir;
358 StringRef Name;
359 if (DirRef.getImportTableEntry(Dir)) return;
360 if (DirRef.getName(Name)) return;
361
362 outs() << format(" lookup %08x time %08x fwd %08x name %08x addr %08x\n\n",
363 static_cast<uint32_t>(Dir->ImportLookupTableRVA),
364 static_cast<uint32_t>(Dir->TimeDateStamp),
365 static_cast<uint32_t>(Dir->ForwarderChain),
366 static_cast<uint32_t>(Dir->NameRVA),
367 static_cast<uint32_t>(Dir->ImportAddressTableRVA));
368 outs() << " DLL Name: " << Name << "\n";
369 outs() << " Hint/Ord Name\n";
370 for (const ImportedSymbolRef &Entry : DirRef.imported_symbols()) {
371 bool IsOrdinal;
372 if (Entry.isOrdinal(IsOrdinal))
373 return;
374 if (IsOrdinal) {
375 uint16_t Ordinal;
376 if (Entry.getOrdinal(Ordinal))
377 return;
378 outs() << format(" % 6d\n", Ordinal);
379 continue;
380 }
381 uint32_t HintNameRVA;
382 if (Entry.getHintNameRVA(HintNameRVA))
383 return;
384 uint16_t Hint;
385 StringRef Name;
386 if (Obj->getHintName(HintNameRVA, Hint, Name))
387 return;
388 outs() << format(" % 6d ", Hint) << Name << "\n";
389 }
390 outs() << "\n";
391 }
392}
393
394// Prints export tables. The export table is a table containing the list of
395// exported symbol from the DLL.
396static void printExportTable(const COFFObjectFile *Obj) {
397 outs() << "Export Table:\n";
398 export_directory_iterator I = Obj->export_directory_begin();
399 export_directory_iterator E = Obj->export_directory_end();
400 if (I == E)
401 return;
402 StringRef DllName;
403 uint32_t OrdinalBase;
404 if (I->getDllName(DllName))
405 return;
406 if (I->getOrdinalBase(OrdinalBase))
407 return;
408 outs() << " DLL name: " << DllName << "\n";
409 outs() << " Ordinal base: " << OrdinalBase << "\n";
410 outs() << " Ordinal RVA Name\n";
411 for (; I != E; I = ++I) {
412 uint32_t Ordinal;
413 if (I->getOrdinal(Ordinal))
414 return;
415 uint32_t RVA;
416 if (I->getExportRVA(RVA))
417 return;
418 bool IsForwarder;
419 if (I->isForwarder(IsForwarder))
420 return;
421
422 if (IsForwarder) {
423 // Export table entries can be used to re-export symbols that
424 // this COFF file is imported from some DLLs. This is rare.
425 // In most cases IsForwarder is false.
426 outs() << format(" % 4d ", Ordinal);
427 } else {
428 outs() << format(" % 4d %# 8x", Ordinal, RVA);
429 }
430
431 StringRef Name;
432 if (I->getSymbolName(Name))
433 continue;
434 if (!Name.empty())
435 outs() << " " << Name;
436 if (IsForwarder) {
437 StringRef S;
438 if (I->getForwardTo(S))
439 return;
440 outs() << " (forwarded to " << S << ")";
441 }
442 outs() << "\n";
443 }
444}
445
446// Given the COFF object file, this function returns the relocations for .pdata
447// and the pointer to "runtime function" structs.
448static bool getPDataSection(const COFFObjectFile *Obj,
449 std::vector<RelocationRef> &Rels,
450 const RuntimeFunction *&RFStart, int &NumRFs) {
451 for (const SectionRef &Section : Obj->sections()) {
452 StringRef Name = unwrapOrError(Section.getName(), Obj->getFileName());
453 if (Name != ".pdata")
454 continue;
455
456 const coff_section *Pdata = Obj->getCOFFSection(Section);
457 append_range(Rels, Section.relocations());
458
459 // Sort relocations by address.
460 llvm::sort(Rels, isRelocAddressLess);
461
462 ArrayRef<uint8_t> Contents;
463 if (Error E = Obj->getSectionContents(Pdata, Contents))
464 reportError(std::move(E), Obj->getFileName());
465
466 if (Contents.empty())
467 continue;
468
469 RFStart = reinterpret_cast<const RuntimeFunction *>(Contents.data());
470 NumRFs = Contents.size() / sizeof(RuntimeFunction);
471 return true;
472 }
473 return false;
474}
475
476Error objdump::getCOFFRelocationValueString(const COFFObjectFile *Obj,
477 const RelocationRef &Rel,
478 SmallVectorImpl<char> &Result) {
479 symbol_iterator SymI = Rel.getSymbol();
480 Expected<StringRef> SymNameOrErr = SymI->getName();
481 if (!SymNameOrErr)
482 return SymNameOrErr.takeError();
483 StringRef SymName = *SymNameOrErr;
484 Result.append(SymName.begin(), SymName.end());
485 return Error::success();
486}
487
488static void printWin64EHUnwindInfo(const Win64EH::UnwindInfo *UI) {
489 // The casts to int are required in order to output the value as number.
490 // Without the casts the value would be interpreted as char data (which
491 // results in garbage output).
492 outs() << " Version: " << static_cast<int>(UI->getVersion()) << "\n";
493 outs() << " Flags: " << static_cast<int>(UI->getFlags());
494 if (UI->getFlags()) {
495 if (UI->getFlags() & UNW_ExceptionHandler)
496 outs() << " UNW_ExceptionHandler";
497 if (UI->getFlags() & UNW_TerminateHandler)
498 outs() << " UNW_TerminateHandler";
499 if (UI->getFlags() & UNW_ChainInfo)
500 outs() << " UNW_ChainInfo";
501 }
502 outs() << "\n";
503 outs() << " Size of prolog: " << static_cast<int>(UI->PrologSize) << "\n";
504 outs() << " Number of Codes: " << static_cast<int>(UI->NumCodes) << "\n";
505 // Maybe this should move to output of UOP_SetFPReg?
506 if (UI->getFrameRegister()) {
507 outs() << " Frame register: "
508 << getUnwindRegisterName(UI->getFrameRegister()) << "\n";
509 outs() << " Frame offset: " << 16 * UI->getFrameOffset() << "\n";
510 } else {
511 outs() << " No frame pointer used\n";
512 }
513 if (UI->getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) {
514 // FIXME: Output exception handler data
515 } else if (UI->getFlags() & UNW_ChainInfo) {
516 // FIXME: Output chained unwind info
517 }
518
519 if (UI->NumCodes)
520 outs() << " Unwind Codes:\n";
521
522 printAllUnwindCodes(makeArrayRef(&UI->UnwindCodes[0], UI->NumCodes));
523
524 outs() << "\n";
525 outs().flush();
526}
527
528/// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
529/// pointing to an executable file.
530static void printRuntimeFunction(const COFFObjectFile *Obj,
531 const RuntimeFunction &RF) {
532 if (!RF.StartAddress)
533 return;
534 outs() << "Function Table:\n"
535 << format(" Start Address: 0x%04x\n",
536 static_cast<uint32_t>(RF.StartAddress))
537 << format(" End Address: 0x%04x\n",
538 static_cast<uint32_t>(RF.EndAddress))
539 << format(" Unwind Info Address: 0x%04x\n",
540 static_cast<uint32_t>(RF.UnwindInfoOffset));
541 uintptr_t addr;
542 if (Obj->getRvaPtr(RF.UnwindInfoOffset, addr))
543 return;
544 printWin64EHUnwindInfo(reinterpret_cast<const Win64EH::UnwindInfo *>(addr));
545}
546
547/// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
548/// pointing to an object file. Unlike executable, fields in RuntimeFunction
549/// struct are filled with zeros, but instead there are relocations pointing to
550/// them so that the linker will fill targets' RVAs to the fields at link
551/// time. This function interprets the relocations to find the data to be used
552/// in the resulting executable.
553static void printRuntimeFunctionRels(const COFFObjectFile *Obj,
554 const RuntimeFunction &RF,
555 uint64_t SectionOffset,
556 const std::vector<RelocationRef> &Rels) {
557 outs() << "Function Table:\n";
558 outs() << " Start Address: ";
559 printCOFFSymbolAddress(outs(), Rels,
560 SectionOffset +
561 /*offsetof(RuntimeFunction, StartAddress)*/ 0,
562 RF.StartAddress);
563 outs() << "\n";
564
565 outs() << " End Address: ";
566 printCOFFSymbolAddress(outs(), Rels,
567 SectionOffset +
568 /*offsetof(RuntimeFunction, EndAddress)*/ 4,
569 RF.EndAddress);
570 outs() << "\n";
571
572 outs() << " Unwind Info Address: ";
573 printCOFFSymbolAddress(outs(), Rels,
574 SectionOffset +
575 /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
576 RF.UnwindInfoOffset);
577 outs() << "\n";
578
579 ArrayRef<uint8_t> XContents;
580 uint64_t UnwindInfoOffset = 0;
581 if (Error E = getSectionContents(
582 Obj, Rels,
583 SectionOffset +
584 /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
585 XContents, UnwindInfoOffset))
586 reportError(std::move(E), Obj->getFileName());
587 if (XContents.empty())
588 return;
589
590 UnwindInfoOffset += RF.UnwindInfoOffset;
591 if (UnwindInfoOffset > XContents.size())
592 return;
593
594 auto *UI = reinterpret_cast<const Win64EH::UnwindInfo *>(XContents.data() +
595 UnwindInfoOffset);
596 printWin64EHUnwindInfo(UI);
597}
598
599void objdump::printCOFFUnwindInfo(const COFFObjectFile *Obj) {
600 if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_AMD64) {
601 WithColor::error(errs(), "llvm-objdump")
602 << "unsupported image machine type "
603 "(currently only AMD64 is supported).\n";
604 return;
605 }
606
607 std::vector<RelocationRef> Rels;
608 const RuntimeFunction *RFStart;
609 int NumRFs;
610 if (!getPDataSection(Obj, Rels, RFStart, NumRFs))
611 return;
612 ArrayRef<RuntimeFunction> RFs(RFStart, NumRFs);
613
614 bool IsExecutable = Rels.empty();
615 if (IsExecutable) {
616 for (const RuntimeFunction &RF : RFs)
617 printRuntimeFunction(Obj, RF);
618 return;
619 }
620
621 for (const RuntimeFunction &RF : RFs) {
622 uint64_t SectionOffset =
623 std::distance(RFs.begin(), &RF) * sizeof(RuntimeFunction);
624 printRuntimeFunctionRels(Obj, RF, SectionOffset, Rels);
625 }
626}
627
628void objdump::printCOFFFileHeader(const object::ObjectFile *Obj) {
629 const COFFObjectFile *file = dyn_cast<const COFFObjectFile>(Obj);
1
Assuming 'Obj' is not a 'COFFObjectFile'
→
2
←
'file' initialized to a null pointer value
→
630 printTLSDirectory(file);
3
←
Passing null pointer value via 1st parameter 'Obj'
→
4
←
Calling 'printTLSDirectory'
→
631 printLoadConfiguration(file);
632 printImportTables(file);
633 printExportTable(file);
634}
635
636void objdump::printCOFFSymbolTable(const object::COFFImportFile *i) {
637 unsigned Index = 0;
638 bool IsCode = i->getCOFFImportHeader()->getType() == COFF::IMPORT_CODE;
639
640 for (const object::BasicSymbolRef &Sym : i->symbols()) {
641 std::string Name;
642 raw_string_ostream NS(Name);
643
644 cantFail(Sym.printName(NS));
645 NS.flush();
646
647 outs() << "[" << format("%2d", Index) << "]"
648 << "(sec " << format("%2d", 0) << ")"
649 << "(fl 0x00)" // Flag bits, which COFF doesn't have.
650 << "(ty " << format("%3x", (IsCode && Index) ? 32 : 0) << ")"
651 << "(scl " << format("%3x", 0) << ") "
652 << "(nx " << 0 << ") "
653 << "0x" << format("%08x", 0) << " " << Name << '\n';
654
655 ++Index;
656 }
657}
658
659void objdump::printCOFFSymbolTable(const COFFObjectFile *coff) {
660 for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
661 Expected<COFFSymbolRef> Symbol = coff->getSymbol(SI);
662 if (!Symbol)
663 reportError(Symbol.takeError(), coff->getFileName());
664
665 Expected<StringRef> NameOrErr = coff->getSymbolName(*Symbol);
666 if (!NameOrErr)
667 reportError(NameOrErr.takeError(), coff->getFileName());
668 StringRef Name = *NameOrErr;
669
670 outs() << "[" << format("%2d", SI) << "]"
671 << "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
672 << "(fl 0x00)" // Flag bits, which COFF doesn't have.
673 << "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
674 << "(scl " << format("%3x", unsigned(Symbol->getStorageClass()))
675 << ") "
676 << "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
677 << "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
678 << Name;
679 if (Demangle && Name.startswith("?")) {
680 int Status = -1;
681 char *DemangledSymbol =
682 microsoftDemangle(Name.data(), nullptr, nullptr, nullptr, &Status);
683
684 if (Status == 0 && DemangledSymbol) {
685 outs() << " (" << StringRef(DemangledSymbol) << ")";
686 std::free(DemangledSymbol);
687 } else {
688 outs() << " (invalid mangled name)";
689 }
690 }
691 outs() << "\n";
692
693 for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
694 if (Symbol->isSectionDefinition()) {
695 const coff_aux_section_definition *asd;
696 if (Error E =
697 coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd))
698 reportError(std::move(E), coff->getFileName());
699
700 int32_t AuxNumber = asd->getNumber(Symbol->isBigObj());
701
702 outs() << "AUX "
703 << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
704 , unsigned(asd->Length)
705 , unsigned(asd->NumberOfRelocations)
706 , unsigned(asd->NumberOfLinenumbers)
707 , unsigned(asd->CheckSum))
708 << format("assoc %d comdat %d\n"
709 , unsigned(AuxNumber)
710 , unsigned(asd->Selection));
711 } else if (Symbol->isFileRecord()) {
712 const char *FileName;
713 if (Error E = coff->getAuxSymbol<char>(SI + 1, FileName))
714 reportError(std::move(E), coff->getFileName());
715
716 StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
717 coff->getSymbolTableEntrySize());
718 outs() << "AUX " << Name.rtrim(StringRef("\0", 1)) << '\n';
719
720 SI = SI + Symbol->getNumberOfAuxSymbols();
721 break;
722 } else if (Symbol->isWeakExternal()) {
723 const coff_aux_weak_external *awe;
724 if (Error E = coff->getAuxSymbol<coff_aux_weak_external>(SI + 1, awe))
725 reportError(std::move(E), coff->getFileName());
726
727 outs() << "AUX " << format("indx %d srch %d\n",
728 static_cast<uint32_t>(awe->TagIndex),
729 static_cast<uint32_t>(awe->Characteristics));
730 } else {
731 outs() << "AUX Unknown\n";
732 }
733 }
734 }
735}