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MC: Factor out MCAssembler::ComputeFragmentSize.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103724 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-05-13 18:35:06 +00:00
parent f1fd2288f3
commit 2c18d3b0fe
2 changed files with 59 additions and 45 deletions
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6
include/llvm/MC/MCAssembler.h
View File

@ -650,6 +650,12 @@ private:
bool FragmentNeedsRelaxation(const MCInstFragment *IF,
const MCAsmLayout &Layout) const;
/// Compute the effective fragment size assuming it is layed out at the given
/// \arg SectionAddress and \arg FragmentOffset.
uint64_t ComputeFragmentSize(MCAsmLayout &Layout, const MCFragment &F,
uint64_t SectionAddress,
uint64_t FragmentOffset) const;
/// LayoutFragment - Performs layout of the given \arg Fragment; assuming that
/// the previous fragment has already been layed out correctly, and the parent
/// section has been initialized.

98
lib/MC/MCAssembler.cpp
View File

@ -375,6 +375,57 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout,
return IsResolved;
}
uint64_t MCAssembler::ComputeFragmentSize(MCAsmLayout &Layout,
const MCFragment &F,
uint64_t SectionAddress,
uint64_t FragmentOffset) const {
switch (F.getKind()) {
case MCFragment::FT_Data:
return cast<MCDataFragment>(F).getContents().size();
case MCFragment::FT_Fill:
return cast<MCFillFragment>(F).getSize();
case MCFragment::FT_Inst:
return cast<MCInstFragment>(F).getInstSize();
case MCFragment::FT_Align: {
const MCAlignFragment &AF = cast<MCAlignFragment>(F);
assert((!AF.hasOnlyAlignAddress() || !AF.getNextNode()) &&
"Invalid OnlyAlignAddress bit, not the last fragment!");
uint64_t Size = OffsetToAlignment(SectionAddress + FragmentOffset,
AF.getAlignment());
// Honor MaxBytesToEmit.
if (Size > AF.getMaxBytesToEmit())
return 0;
return Size;
}
case MCFragment::FT_Org: {
const MCOrgFragment &OF = cast<MCOrgFragment>(F);
// FIXME: We should compute this sooner, we don't want to recurse here, and
// we would like to be more functional.
int64_t TargetLocation;
if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, &Layout))
report_fatal_error("expected assembly-time absolute expression");
// FIXME: We need a way to communicate this error.
int64_t Offset = TargetLocation - FragmentOffset;
if (Offset < 0)
report_fatal_error("invalid .org offset '" + Twine(TargetLocation) +
"' (at offset '" + Twine(FragmentOffset) + "'");
return Offset;
}
}
assert(0 && "invalid fragment kind");
return 0;
}
void MCAssembler::LayoutFragment(MCAsmLayout &Layout, MCFragment &F) {
uint64_t StartAddress = Layout.getSectionAddress(F.getParent());
@ -391,51 +442,8 @@ void MCAssembler::LayoutFragment(MCAsmLayout &Layout, MCFragment &F) {
Layout.setFragmentOffset(&F, FragmentOffset);
// Evaluate fragment size.
uint64_t EffectiveSize = 0;
switch (F.getKind()) {
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;
break;
}
case MCFragment::FT_Data:
EffectiveSize = cast<MCDataFragment>(F).getContents().size();
break;
case MCFragment::FT_Fill: {
EffectiveSize = cast<MCFillFragment>(F).getSize();
break;
}
case MCFragment::FT_Inst:
EffectiveSize = cast<MCInstFragment>(F).getInstSize();
break;
case MCFragment::FT_Org: {
MCOrgFragment &OF = cast<MCOrgFragment>(F);
int64_t TargetLocation;
if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, &Layout))
report_fatal_error("expected assembly-time absolute expression");
// FIXME: We need a way to communicate this error.
int64_t Offset = TargetLocation - FragmentOffset;
if (Offset < 0)
report_fatal_error("invalid .org offset '" + Twine(TargetLocation) +
"' (at offset '" + Twine(FragmentOffset) + "'");
EffectiveSize = Offset;
break;
}
}
uint64_t EffectiveSize = ComputeFragmentSize(Layout, F, StartAddress,
FragmentOffset);
Layout.setFragmentEffectiveSize(&F, EffectiveSize);
}