C++ (Cpp) MCSectionData::hasInstructions Examples

Example #1

File: MachObjectWriter.cpp Project: biometrics/llvm

void MachObjectWriter::WriteSection(const MCAssembler &Asm,
                                    const MCAsmLayout &Layout,
                                    const MCSectionData &SD,
                                    uint64_t FileOffset,
                                    uint64_t RelocationsStart,
                                    unsigned NumRelocations) {
  uint64_t SectionSize = Layout.getSectionAddressSize(&SD);

  // The offset is unused for virtual sections.
  if (SD.getSection().isVirtualSection()) {
    assert(Layout.getSectionFileSize(&SD) == 0 && "Invalid file size!");
    FileOffset = 0;
  }

  // struct section (68 bytes) or
  // struct section_64 (80 bytes)

  uint64_t Start = OS.tell();
  (void) Start;

  const MCSectionMachO &Section = cast<MCSectionMachO>(SD.getSection());
  WriteBytes(Section.getSectionName(), 16);
  WriteBytes(Section.getSegmentName(), 16);
  if (is64Bit()) {
    Write64(getSectionAddress(&SD)); // address
    Write64(SectionSize); // size
  } else {
    Write32(getSectionAddress(&SD)); // address
    Write32(SectionSize); // size
  }
  Write32(FileOffset);

  unsigned Flags = Section.getTypeAndAttributes();
  if (SD.hasInstructions())
    Flags |= MCSectionMachO::S_ATTR_SOME_INSTRUCTIONS;

  assert(isPowerOf2_32(SD.getAlignment()) && "Invalid alignment!");
  Write32(Log2_32(SD.getAlignment()));
  Write32(NumRelocations ? RelocationsStart : 0);
  Write32(NumRelocations);
  Write32(Flags);
  Write32(IndirectSymBase.lookup(&SD)); // reserved1
  Write32(Section.getStubSize()); // reserved2
  if (is64Bit())
    Write32(0); // reserved3

  assert(OS.tell() - Start == (is64Bit() ? macho::Section64Size :
                               macho::Section32Size));
}