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Object: Add support for bigobj

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This adds support for reading the "bigobj" variant of COFF produced by
cl's /bigobj and mingw's -mbig-obj.

The most significant difference that bigobj brings is more than 2**16
sections to COFF.

bigobj brings a few interesting differences with it:
- It doesn't have a Characteristics field in the file header.
- It doesn't have a SizeOfOptionalHeader field in the file header (it's
  only used in executable files).
- Auxiliary symbol records have the same width as a symbol table entry.
  Since symbol table entries are bigger, so are auxiliary symbol
  records.

Write support will come soon.

Differential Revision: http://reviews.llvm.org/D5259

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217496 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-09-10 12:51:52 +00:00
parent cfae729840
commit b3a86a097b
24 changed files with 630 additions and 314 deletions
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34
tools/llvm-objdump/llvm-objdump.cpp
View File

@ -564,29 +564,25 @@ static void PrintSectionContents(const ObjectFile *Obj) {
}
static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
const coff_file_header *header;
if (error(coff->getHeader(header)))
return;
for (unsigned SI = 0, SE = header->NumberOfSymbols; SI != SE; ++SI) {
const coff_symbol *Symbol;
for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI);
StringRef Name;
if (error(coff->getSymbol(SI, Symbol)))
if (error(Symbol.getError()))
return;
if (error(coff->getSymbolName(Symbol, Name)))
if (error(coff->getSymbolName(*Symbol, Name)))
return;
outs() << "[" << format("%2d", SI) << "]"
<< "(sec " << format("%2d", int(Symbol->SectionNumber)) << ")"
<< "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
<< "(fl 0x00)" // Flag bits, which COFF doesn't have.
<< "(ty " << format("%3x", unsigned(Symbol->Type)) << ")"
<< "(scl " << format("%3x", unsigned(Symbol->StorageClass)) << ") "
<< "(nx " << unsigned(Symbol->NumberOfAuxSymbols) << ") "
<< "0x" << format("%08x", unsigned(Symbol->Value)) << " "
<< "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
<< "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") "
<< "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
<< "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
<< Name << "\n";
for (unsigned AI = 0, AE = Symbol->NumberOfAuxSymbols; AI < AE; ++AI, ++SI) {
for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
if (Symbol->isSectionDefinition()) {
const coff_aux_section_definition *asd;
if (error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd)))
@ -602,15 +598,15 @@ static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
, unsigned(asd->Number)
, unsigned(asd->Selection));
} else if (Symbol->isFileRecord()) {
const coff_aux_file *AF;
if (error(coff->getAuxSymbol<coff_aux_file>(SI + 1, AF)))
const char *FileName;
if (error(coff->getAuxSymbol<char>(SI + 1, FileName)))
return;
StringRef Name(AF->FileName,
Symbol->NumberOfAuxSymbols * COFF::SymbolSize);
StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
coff->getSymbolTableEntrySize());
outs() << "AUX " << Name.rtrim(StringRef("\0", 1)) << '\n';
SI = SI + Symbol->NumberOfAuxSymbols;
SI = SI + Symbol->getNumberOfAuxSymbols();
break;
} else {
outs() << "AUX Unknown\n";