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Move some ARM specific MCAssmebler bits into the ARMAsmBackend.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-01-18 00:23:57 +00:00
parent 31867660cb
commit 9b5b125c34
3 changed files with 27 additions and 9 deletions
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10
include/llvm/MC/MCAsmBackend.h
View File

@ -17,12 +17,15 @@
namespace llvm {
class MCAsmLayout;
class MCAssembler;
class MCELFObjectTargetWriter;
class MCFixup;
class MCFragment;
class MCInst;
class MCInstFragment;
class MCObjectWriter;
class MCSection;
class MCValue;
template<typename T>
class SmallVectorImpl;
class raw_ostream;
@ -87,6 +90,13 @@ public:
/// getFixupKindInfo - Get information on a fixup kind.
virtual const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const;
/// processFixupValue - Target hook to adjust the literal value of a fixup
/// if necessary. The default does nothing.
virtual void processFixupValue(const MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFixup &Fixup, const MCFragment *DF,
MCValue &Target, uint64_t &Value) {}
/// @}
/// ApplyFixup - Apply the \arg Value for given \arg Fixup into the provided

11
lib/MC/MCAssembler.cpp
View File

@ -273,13 +273,10 @@ bool MCAssembler::evaluateFixup(const MCAsmLayout &Layout,
Value = Target.getConstant();
bool IsThumb = false;
if (const MCSymbolRefExpr *A = Target.getSymA()) {
const MCSymbol &Sym = A->getSymbol().AliasedSymbol();
if (Sym.isDefined())
Value += Layout.getSymbolOffset(&getSymbolData(Sym));
if (isThumbFunc(&Sym))
IsThumb = true;
}
if (const MCSymbolRefExpr *B = Target.getSymB()) {
const MCSymbol &Sym = B->getSymbol().AliasedSymbol();
@ -302,12 +299,8 @@ bool MCAssembler::evaluateFixup(const MCAsmLayout &Layout,
Value -= Offset;
}
// ARM fixups based from a thumb function address need to have the low
// bit set. The actual value is always at least 16-bit aligned, so the
// low bit is normally clear and available for use as an ISA flag for
// interworking.
if (IsThumb)
Value |= 1;
// Let the backend adjust the fixup value if necessary.
Backend.processFixupValue(*this, Layout, Fixup, DF, Target, Value);
return IsResolved;
}

15
lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
View File

@ -22,6 +22,7 @@
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Object/MachOFormat.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
@ -101,6 +102,20 @@ public:
return Infos[Kind - FirstTargetFixupKind];
}
/// processFixupValue - Target hook to process the literal value of a fixup
/// if necessary.
void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
const MCFixup &Fixup, const MCFragment *DF,
MCValue &Target, uint64_t &Value) {
// Some fixups to thumb function symbols need the low bit (thumb bit)
// twiddled.
if (const MCSymbolRefExpr *A = Target.getSymA()) {
const MCSymbol &Sym = A->getSymbol().AliasedSymbol();
if (Asm.isThumbFunc(&Sym))
Value |= 1;
}
}
bool MayNeedRelaxation(const MCInst &Inst) const;
bool fixupNeedsRelaxation(const MCFixup &Fixup,