Exemplo n.º 1
0
void MCAssembler::writeSectionData(const MCSectionData *SD,
                                   const MCAsmLayout &Layout) const {
  // Ignore virtual sections.
  if (SD->getSection().isVirtualSection()) {
    assert(Layout.getSectionFileSize(SD) == 0 && "Invalid size for section!");

    // Check that contents are only things legal inside a virtual section.
    for (MCSectionData::const_iterator it = SD->begin(),
           ie = SD->end(); it != ie; ++it) {
      switch (it->getKind()) {
      default: llvm_unreachable("Invalid fragment in virtual section!");
      case MCFragment::FT_Data: {
        // Check that we aren't trying to write a non-zero contents (or fixups)
        // into a virtual section. This is to support clients which use standard
        // directives to fill the contents of virtual sections.
        const MCDataFragment &DF = cast<MCDataFragment>(*it);
        assert(DF.fixup_begin() == DF.fixup_end() &&
               "Cannot have fixups in virtual section!");
        for (unsigned i = 0, e = DF.getContents().size(); i != e; ++i)
          if (DF.getContents()[i]) {
            if (auto *ELFSec = dyn_cast<const MCSectionELF>(&SD->getSection()))
              report_fatal_error("non-zero initializer found in section '" +
                  ELFSec->getSectionName() + "'");
            else
              report_fatal_error("non-zero initializer found in virtual section");
          }
        break;
      }
      case MCFragment::FT_Align:
        // Check that we aren't trying to write a non-zero value into a virtual
        // section.
        assert((cast<MCAlignFragment>(it)->getValueSize() == 0 ||
                cast<MCAlignFragment>(it)->getValue() == 0) &&
               "Invalid align in virtual section!");
        break;
      case MCFragment::FT_Fill:
        assert((cast<MCFillFragment>(it)->getValueSize() == 0 ||
                cast<MCFillFragment>(it)->getValue() == 0) &&
               "Invalid fill in virtual section!");
        break;
      }
    }

    return;
  }

  uint64_t Start = getWriter().getStream().tell();
  (void)Start;

  for (MCSectionData::const_iterator it = SD->begin(), ie = SD->end();
       it != ie; ++it)
    writeFragment(*this, Layout, *it);

  assert(getWriter().getStream().tell() - Start ==
         Layout.getSectionAddressSize(SD));
}
Exemplo n.º 2
0
void MCAssembler::WriteSectionData(const MCSectionData *SD,
                                   const MCAsmLayout &Layout,
                                   MCObjectWriter *OW) const {
  // Ignore virtual sections.
  if (getBackend().isVirtualSection(SD->getSection())) {
    assert(Layout.getSectionFileSize(SD) == 0 && "Invalid size for section!");

    // Check that contents are only things legal inside a virtual section.
    for (MCSectionData::const_iterator it = SD->begin(),
           ie = SD->end(); it != ie; ++it) {
      switch (it->getKind()) {
      default:
        assert(0 && "Invalid fragment in virtual section!");
      case MCFragment::FT_Data: {
        // Check that we aren't trying to write a non-zero contents (or fixups)
        // into a virtual section. This is to support clients which use standard
        // directives to fill the contents of virtual sections.
        MCDataFragment &DF = cast<MCDataFragment>(*it);
        assert(DF.fixup_begin() == DF.fixup_end() &&
               "Cannot have fixups in virtual section!");
        for (unsigned i = 0, e = DF.getContents().size(); i != e; ++i)
          assert(DF.getContents()[i] == 0 &&
                 "Invalid data value for virtual section!");
        break;
      }
      case MCFragment::FT_Align:
        // Check that we aren't trying to write a non-zero value into a virtual
        // section.
        assert((!cast<MCAlignFragment>(it)->getValueSize() ||
                !cast<MCAlignFragment>(it)->getValue()) &&
               "Invalid align in virtual section!");
        break;
      case MCFragment::FT_Fill:
        assert(!cast<MCFillFragment>(it)->getValueSize() &&
               "Invalid fill in virtual section!");
        break;
      }
    }

    return;
  }

  uint64_t Start = OW->getStream().tell();
  (void) Start;

  for (MCSectionData::const_iterator it = SD->begin(),
         ie = SD->end(); it != ie; ++it)
    WriteFragmentData(*this, Layout, *it, OW);

  assert(OW->getStream().tell() - Start == Layout.getSectionFileSize(SD));
}