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MC: Create dummy fragments to avoid ever having empty sections, which simplifies layout.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103710 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-05-13 08:43:34 +00:00
parent aa0d350fe5
commit 09d3465f0e
1 changed files with 9 additions and 8 deletions
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17
lib/MC/MCAssembler.cpp
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@ -116,10 +116,6 @@ void MCAsmLayout::setSectionAddress(MCSectionData *SD, uint64_t Value) {
} }
uint64_t MCAsmLayout::getSectionAddressSize(const MCSectionData *SD) const { uint64_t MCAsmLayout::getSectionAddressSize(const MCSectionData *SD) const {
// Empty sections have no size.
if (SD->getFragmentList().empty())
return 0;
// Otherwise, the size is the last fragment's end offset. // Otherwise, the size is the last fragment's end offset.
const MCFragment &F = SD->getFragmentList().back(); const MCFragment &F = SD->getFragmentList().back();
return getFragmentOffset(&F) + getFragmentEffectiveSize(&F); return getFragmentOffset(&F) + getFragmentEffectiveSize(&F);
@ -135,10 +131,6 @@ uint64_t MCAsmLayout::getSectionFileSize(const MCSectionData *SD) const {
} }
uint64_t MCAsmLayout::getSectionSize(const MCSectionData *SD) const { uint64_t MCAsmLayout::getSectionSize(const MCSectionData *SD) const {
// Empty sections have no size.
if (SD->getFragmentList().empty())
return 0;
// The logical size is the address space size minus any tail padding. // The logical size is the address space size minus any tail padding.
uint64_t Size = getSectionAddressSize(SD); uint64_t Size = getSectionAddressSize(SD);
const MCAlignFragment *AF = const MCAlignFragment *AF =
@ -611,6 +603,15 @@ void MCAssembler::Finish() {
unsigned SectionIndex = 0; unsigned SectionIndex = 0;
unsigned FragmentIndex = 0; unsigned FragmentIndex = 0;
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) { for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
// Create dummy fragments to eliminate any empty sections, this simplifies
// layout.
if (it->getFragmentList().empty()) {
unsigned ValueSize = 1;
if (getBackend().isVirtualSection(it->getSection()))
ValueSize = 1;
new MCFillFragment(0, 1, 0, it);
}
it->setOrdinal(SectionIndex++); it->setOrdinal(SectionIndex++);
for (MCSectionData::iterator it2 = it->begin(), for (MCSectionData::iterator it2 = it->begin(),