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Teach llvm-objdump with the -macho parser how to use the data in code table

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from the LC_DATA_IN_CODE load command.  And when disassembling print
the data in code formatted for the kind of data it and not disassemble those
bytes.

I added the format specific functionality to the derived class MachOObjectFile
since these tables only appears in Mach-O object files. This is my first
attempt to modify the libObject stuff so if folks have better suggestions
how to fit this in or suggestions on the implementation please let me know.

rdar://11791371


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby
2013-06-06 17:20:50 +00:00
parent f2988a0084
commit 54154f3bf1
6 changed files with 253 additions and 8 deletions
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46
lib/Object/MachOObjectFile.cpp
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@ -414,7 +414,7 @@ MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
bool IsLittleEndian, bool Is64bits,
error_code &ec)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL) {
SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
uint32_t LoadCommandCount = this->getHeader().NumLoadCommands;
macho::LoadCommandType SegmentLoadType = is64Bit() ?
macho::LCT_Segment64 : macho::LCT_Segment;
@ -427,6 +427,9 @@ MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
} else if (Load.C.Type == macho::LCT_Dysymtab) {
assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
DysymtabLoadCmd = Load.Ptr;
} else if (Load.C.Type == macho::LCT_DataInCode) {
assert(!DataInCodeLoadCmd && "Multiple data in code tables");
DataInCodeLoadCmd = Load.Ptr;
} else if (Load.C.Type == SegmentLoadType) {
uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
for (unsigned J = 0; J < NumSections; ++J) {
@ -1328,6 +1331,27 @@ relocation_iterator MachOObjectFile::getSectionRelEnd(unsigned Index) const {
return getSectionRelEnd(DRI);
}
dice_iterator MachOObjectFile::begin_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.DataOffset));
return dice_iterator(DiceRef(DRI, this));
}
dice_iterator MachOObjectFile::end_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
macho::LinkeditDataLoadCommand DicLC = getDataInCodeLoadCommand();
unsigned Offset = DicLC.DataOffset + DicLC.DataSize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return dice_iterator(DiceRef(DRI, this));
}
StringRef
MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
@ -1492,6 +1516,12 @@ MachOObjectFile::getRelocation(DataRefImpl Rel) const {
return getStruct<macho::RelocationEntry>(this, P);
}
macho::DataInCodeTableEntry
MachOObjectFile::getDice(DataRefImpl Rel) const {
const char *P = reinterpret_cast<const char *>(Rel.p);
return getStruct<macho::DataInCodeTableEntry>(this, P);
}
macho::Header MachOObjectFile::getHeader() const {
return getStruct<macho::Header>(this, getPtr(this, 0));
}
@ -1524,6 +1554,20 @@ macho::DysymtabLoadCommand MachOObjectFile::getDysymtabLoadCommand() const {
return getStruct<macho::DysymtabLoadCommand>(this, DysymtabLoadCmd);
}
macho::LinkeditDataLoadCommand
MachOObjectFile::getDataInCodeLoadCommand() const {
if (DataInCodeLoadCmd)
return getStruct<macho::LinkeditDataLoadCommand>(this, DataInCodeLoadCmd);
// If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
macho::LinkeditDataLoadCommand Cmd;
Cmd.Type = macho::LCT_DataInCode;
Cmd.Size = macho::LinkeditLoadCommandSize;
Cmd.DataOffset = 0;
Cmd.DataSize = 0;
return Cmd;
}
StringRef MachOObjectFile::getStringTableData() const {
macho::SymtabLoadCommand S = getSymtabLoadCommand();
return getData().substr(S.StringTableOffset, S.StringTableSize);