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MC: Add MCAlignFragment::OnlyAlignAddress bit. This is a bit of magic that says the align fragment shouldn't contribute to the logical section size, it is will be used for cleaning up the code to handle section alignment.

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llvm-svn: 103690
This commit is contained in:
Daniel Dunbar 2010-05-13 01:10:26 +00:00
parent ec3a2ac5ed
commit 3fc379596a
2 changed files with 28 additions and 2 deletions
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12
include/llvm/MC/MCAssembler.h
View File

@ -258,12 +258,19 @@ class MCAlignFragment : public MCFragment {
/// target dependent.
bool EmitNops : 1;
/// OnlyAlignAddress - Flag to indicate that this align is only used to adjust
/// the address space size of a section and that it should not be included as
/// part of the section size. This flag can only be used on the last fragment
/// in a section.
bool OnlyAlignAddress : 1;
public:
MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize,
unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
: MCFragment(FT_Align, SD), Alignment(_Alignment),
Value(_Value),ValueSize(_ValueSize),
MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false) {}
MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false),
OnlyAlignAddress(false) {}
/// @name Accessors
/// @{
@ -279,6 +286,9 @@ public:
bool hasEmitNops() const { return EmitNops; }
void setEmitNops(bool Value) { EmitNops = Value; }
bool hasOnlyAlignAddress() const { return OnlyAlignAddress; }
void setOnlyAlignAddress(bool Value) { OnlyAlignAddress = Value; }
/// @}
static bool classof(const MCFragment *F) {

18
lib/MC/MCAssembler.cpp
View File

@ -392,6 +392,9 @@ void MCAssembler::LayoutFragment(MCAsmLayout &Layout, MCFragment &F) {
case MCFragment::FT_Align: {
MCAlignFragment &AF = cast<MCAlignFragment>(F);
assert((!AF.hasOnlyAlignAddress() || !AF.getNextNode()) &&
"Invalid OnlyAlignAddress bit, not the last fragment!");
EffectiveSize = OffsetToAlignment(Address, AF.getAlignment());
if (EffectiveSize > AF.getMaxBytesToEmit())
EffectiveSize = 0;
@ -474,9 +477,18 @@ void MCAssembler::LayoutSection(MCAsmLayout &Layout,
MCFragment *F = &SD.getFragmentList().back();
Size = Layout.getFragmentOffset(F) + Layout.getFragmentEffectiveSize(F);
}
Layout.setSectionSize(&SD, Size);
Layout.setSectionAddressSize(&SD, Size);
Layout.setSectionFileSize(&SD, IsVirtual ? 0 : Size);
// Handle OnlyAlignAddress bit.
if (!SD.getFragmentList().empty()) {
MCAlignFragment *AF =
dyn_cast<MCAlignFragment>(&SD.getFragmentList().back());
if (AF && AF->hasOnlyAlignAddress())
Size -= Layout.getFragmentEffectiveSize(AF);
}
Layout.setSectionSize(&SD, Size);
}
/// WriteFragmentData - Write the \arg F data to the output file.
@ -856,6 +868,10 @@ void MCAlignFragment::dump() {
OS << "<MCAlignFragment ";
this->MCFragment::dump();
if (hasEmitNops())
OS << " (emit nops)";
if (hasOnlyAlignAddress())
OS << " (only align section)";
OS << "\n ";
OS << " Alignment:" << getAlignment()
<< " Value:" << getValue() << " ValueSize:" << getValueSize()