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Relax address updates in the eh_frame section.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122591 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-12-28 05:39:27 +00:00
parent 5bba084253
commit 245a1e2041
8 changed files with 145 additions and 29 deletions
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40
lib/MC/MCAssembler.cpp
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@@ -323,6 +323,8 @@ uint64_t MCAssembler::ComputeFragmentSize(const MCAsmLayout &Layout,
case MCFragment::FT_Dwarf:
return cast<MCDwarfLineAddrFragment>(F).getContents().size();
case MCFragment::FT_DwarfFrame:
return cast<MCDwarfCallFrameFragment>(F).getContents().size();
}
assert(0 && "invalid fragment kind");
@@ -453,6 +455,11 @@ static void WriteFragmentData(const MCAssembler &Asm, const MCAsmLayout &Layout,
OW->WriteBytes(OF.getContents().str());
break;
}
case MCFragment::FT_DwarfFrame: {
const MCDwarfCallFrameFragment &CF = cast<MCDwarfCallFrameFragment>(F);
OW->WriteBytes(CF.getContents().str());
break;
}
}
assert(OW->getStream().tell() - Start == FragmentSize);
@@ -712,6 +719,21 @@ bool MCAssembler::RelaxDwarfLineAddr(MCAsmLayout &Layout,
return OldSize != Data.size();
}
bool MCAssembler::RelaxDwarfCallFrameFragment(MCAsmLayout &Layout,
MCDwarfCallFrameFragment &DF) {
int64_t AddrDelta = 0;
uint64_t OldSize = DF.getContents().size();
bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout);
(void)IsAbs;
assert(IsAbs);
SmallString<8> &Data = DF.getContents();
Data.clear();
raw_svector_ostream OSE(Data);
MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OSE);
OSE.flush();
return OldSize != Data.size();
}
bool MCAssembler::LayoutSectionOnce(MCAsmLayout &Layout,
MCSectionData &SD) {
MCFragment *FirstInvalidFragment = NULL;
@@ -730,9 +752,14 @@ bool MCAssembler::LayoutSectionOnce(MCAsmLayout &Layout,
relaxedFrag = RelaxDwarfLineAddr(Layout,
*cast<MCDwarfLineAddrFragment>(it2));
break;
case MCFragment::FT_LEB:
relaxedFrag = RelaxLEB(Layout, *cast<MCLEBFragment>(it2));
break;
case MCFragment::FT_DwarfFrame:
relaxedFrag =
RelaxDwarfCallFrameFragment(Layout,
*cast<MCDwarfCallFrameFragment>(it2));
break;
case MCFragment::FT_LEB:
relaxedFrag = RelaxLEB(Layout, *cast<MCLEBFragment>(it2));
break;
}
// Update the layout, and remember that we relaxed.
if (relaxedFrag && !FirstInvalidFragment)
@@ -789,6 +816,7 @@ void MCFragment::dump() {
case MCFragment::FT_Inst: OS << "MCInstFragment"; break;
case MCFragment::FT_Org: OS << "MCOrgFragment"; break;
case MCFragment::FT_Dwarf: OS << "MCDwarfFragment"; break;
case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break;
case MCFragment::FT_LEB: OS << "MCLEBFragment"; break;
}
@@ -855,6 +883,12 @@ void MCFragment::dump() {
<< " LineDelta:" << OF->getLineDelta();
break;
}
case MCFragment::FT_DwarfFrame: {
const MCDwarfCallFrameFragment *CF = cast<MCDwarfCallFrameFragment>(this);
OS << "\n ";
OS << " AddrDelta:" << CF->getAddrDelta();
break;
}
case MCFragment::FT_LEB: {
const MCLEBFragment *LF = cast<MCLEBFragment>(this);
OS << "\n ";