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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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33
include/llvm/MC/MCAssembler.h
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@ -52,6 +52,7 @@ public:
FT_Inst,
FT_Org,
FT_Dwarf,
FT_DwarfFrame,
FT_LEB
};
@ -369,7 +370,7 @@ class MCDwarfLineAddrFragment : public MCFragment {
public:
MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
MCSectionData *SD = 0)
MCSectionData *SD)
: MCFragment(FT_Dwarf, SD),
LineDelta(_LineDelta), AddrDelta(&_AddrDelta) { Contents.push_back(0); }
@ -391,6 +392,34 @@ public:
static bool classof(const MCDwarfLineAddrFragment *) { return true; }
};
class MCDwarfCallFrameFragment : public MCFragment {
/// AddrDelta - The expression for the difference of the two symbols that
/// make up the address delta between two .cfi_* dwarf directives.
const MCExpr *AddrDelta;
SmallString<8> Contents;
public:
MCDwarfCallFrameFragment(const MCExpr &_AddrDelta, MCSectionData *SD)
: MCFragment(FT_DwarfFrame, SD),
AddrDelta(&_AddrDelta) { Contents.push_back(0); }
/// @name Accessors
/// @{
const MCExpr &getAddrDelta() const { return *AddrDelta; }
SmallString<8> &getContents() { return Contents; }
const SmallString<8> &getContents() const { return Contents; }
/// @}
static bool classof(const MCFragment *F) {
return F->getKind() == MCFragment::FT_DwarfFrame;
}
static bool classof(const MCDwarfCallFrameFragment *) { return true; }
};
// FIXME: Should this be a separate class, or just merged into MCSection? Since
// we anticipate the fast path being through an MCAssembler, the only reason to
// keep it out is for API abstraction.
@ -705,6 +734,8 @@ private:
bool RelaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
bool RelaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
bool RelaxDwarfCallFrameFragment(MCAsmLayout &Layout,
MCDwarfCallFrameFragment &DF);
/// FinishLayout - Finalize a layout, including fragment lowering.
void FinishLayout(MCAsmLayout &Layout);