1 #include "Object.h"
2 #include "../llvm-objcopy.h"
3 
4 namespace llvm {
5 namespace objcopy {
6 namespace macho {
7 
8 const SymbolEntry *SymbolTable::getSymbolByIndex(uint32_t Index) const {
9   assert(Index < Symbols.size() && "invalid symbol index");
10   return Symbols[Index].get();
11 }
12 
13 SymbolEntry *SymbolTable::getSymbolByIndex(uint32_t Index) {
14   return const_cast<SymbolEntry *>(
15       static_cast<const SymbolTable *>(this)->getSymbolByIndex(Index));
16 }
17 
18 void SymbolTable::removeSymbols(
19     function_ref<bool(const std::unique_ptr<SymbolEntry> &)> ToRemove) {
20   Symbols.erase(
21       std::remove_if(std::begin(Symbols), std::end(Symbols), ToRemove),
22       std::end(Symbols));
23 }
24 
25 void Object::removeSections(function_ref<bool(const Section &)> ToRemove) {
26   for (LoadCommand &LC : LoadCommands)
27     LC.Sections.erase(std::remove_if(std::begin(LC.Sections),
28                                      std::end(LC.Sections), ToRemove),
29                       std::end(LC.Sections));
30 }
31 
32 void Object::addLoadCommand(LoadCommand LC) {
33   LoadCommands.push_back(std::move(LC));
34 }
35 
36 template <typename SegmentType>
37 static void constructSegment(SegmentType &Seg,
38                              llvm::MachO::LoadCommandType CmdType,
39                              StringRef SegName) {
40   assert(SegName.size() <= sizeof(Seg.segname) && "too long segment name");
41   memset(&Seg, 0, sizeof(SegmentType));
42   Seg.cmd = CmdType;
43   strncpy(Seg.segname, SegName.data(), SegName.size());
44 }
45 
46 LoadCommand &Object::addSegment(StringRef SegName) {
47   LoadCommand LC;
48   if (is64Bit())
49     constructSegment(LC.MachOLoadCommand.segment_command_64_data,
50                      MachO::LC_SEGMENT_64, SegName);
51   else
52     constructSegment(LC.MachOLoadCommand.segment_command_data,
53                      MachO::LC_SEGMENT, SegName);
54 
55   LoadCommands.push_back(LC);
56   return LoadCommands.back();
57 }
58 
59 /// Extracts a segment name from a string which is possibly non-null-terminated.
60 static StringRef extractSegmentName(const char *SegName) {
61   return StringRef(SegName,
62                    strnlen(SegName, sizeof(MachO::segment_command::segname)));
63 }
64 
65 Optional<StringRef> LoadCommand::getSegmentName() const {
66   const MachO::macho_load_command &MLC = MachOLoadCommand;
67   switch (MLC.load_command_data.cmd) {
68   case MachO::LC_SEGMENT:
69     return extractSegmentName(MLC.segment_command_data.segname);
70   case MachO::LC_SEGMENT_64:
71     return extractSegmentName(MLC.segment_command_64_data.segname);
72   default:
73     return None;
74   }
75 }
76 
77 } // end namespace macho
78 } // end namespace objcopy
79 } // end namespace llvm
80