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Implement PIC for arm-linux.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36324 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lauro Ramos Venancio 2007-04-22 00:04:12 +00:00
parent 88894b6c40
commit 0ae4a3357a
7 changed files with 88 additions and 13 deletions
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8
lib/Target/ARM/ARMAsmPrinter.cpp
View File

@ -133,6 +133,7 @@ namespace {
O << TAI->getPrivateGlobalPrefix() << Name << "$stub";
} else
O << Name;
if (ACPV->hasModifier()) O << "(" << ACPV->getModifier() << ")";
if (ACPV->getPCAdjustment() != 0)
O << "-(" << TAI->getPrivateGlobalPrefix() << "PC"
<< utostr(ACPV->getLabelId())
@ -284,7 +285,9 @@ void ARMAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
FnStubs.insert(Name);
} else
O << Name;
if (isCallOp && Subtarget->isTargetELF() &&
TM.getRelocationModel() == Reloc::PIC_)
O << "(PLT)";
if (GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
break;
@ -299,6 +302,9 @@ void ARMAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
FnStubs.insert(Name);
} else
O << Name;
if (isCallOp && Subtarget->isTargetELF() &&
TM.getRelocationModel() == Reloc::PIC_)
O << "(PLT)";
break;
}
case MachineOperand::MO_ConstantPoolIndex:

20
lib/Target/ARM/ARMConstantPoolValue.cpp
View File

@ -19,15 +19,26 @@ using namespace llvm;
ARMConstantPoolValue::ARMConstantPoolValue(GlobalValue *gv, unsigned id,
ARMCP::ARMCPKind k,
unsigned char PCAdj)
unsigned char PCAdj,
const char *Modif)
: MachineConstantPoolValue((const Type*)gv->getType()),
GV(gv), S(NULL), LabelId(id), Kind(k), PCAdjust(PCAdj) {}
GV(gv), S(NULL), LabelId(id), Kind(k), PCAdjust(PCAdj),
Modifier(Modif) {}
ARMConstantPoolValue::ARMConstantPoolValue(const char *s, unsigned id,
ARMCP::ARMCPKind k,
unsigned char PCAdj)
unsigned char PCAdj,
const char *Modif)
: MachineConstantPoolValue((const Type*)Type::Int32Ty),
GV(NULL), S(s), LabelId(id), Kind(k), PCAdjust(PCAdj) {}
GV(NULL), S(s), LabelId(id), Kind(k), PCAdjust(PCAdj),
Modifier(Modif) {}
ARMConstantPoolValue::ARMConstantPoolValue(GlobalValue *gv,
ARMCP::ARMCPKind k,
const char *Modif)
: MachineConstantPoolValue((const Type*)Type::Int32Ty),
GV(gv), S(NULL), LabelId(0), Kind(k), PCAdjust(0),
Modifier(Modif) {}
int ARMConstantPoolValue::getExistingMachineCPValue(MachineConstantPool *CP,
unsigned Alignment) {
@ -66,6 +77,7 @@ void ARMConstantPoolValue::print(std::ostream &O) const {
O << S;
if (isNonLazyPointer()) O << "$non_lazy_ptr";
else if (isStub()) O << "$stub";
if (Modifier) O << "(" << Modifier << ")";
if (PCAdjust != 0) O << "-(LPIC" << LabelId << "+"
<< (unsigned)PCAdjust << ")";
}

10
lib/Target/ARM/ARMConstantPoolValue.h
View File

@ -36,17 +36,23 @@ class ARMConstantPoolValue : public MachineConstantPoolValue {
ARMCP::ARMCPKind Kind; // non_lazy_ptr or stub?
unsigned char PCAdjust; // Extra adjustment if constantpool is pc relative.
// 8 for ARM, 4 for Thumb.
const char *Modifier; // GV modifier i.e. (&GV(modifier)-(LPIC+8))
public:
ARMConstantPoolValue(GlobalValue *gv, unsigned id,
ARMCP::ARMCPKind Kind = ARMCP::CPValue,
unsigned char PCAdj = 0);
unsigned char PCAdj = 0, const char *Modifier = NULL);
ARMConstantPoolValue(const char *s, unsigned id,
ARMCP::ARMCPKind Kind = ARMCP::CPValue,
unsigned char PCAdj = 0);
unsigned char PCAdj = 0, const char *Modifier = NULL);
ARMConstantPoolValue(GlobalValue *GV, ARMCP::ARMCPKind Kind,
const char *Modifier);
GlobalValue *getGV() const { return GV; }
const char *getSymbol() const { return S; }
const char *getModifier() const { return Modifier; }
bool hasModifier() const { return Modifier != NULL; }
unsigned getLabelId() const { return LabelId; }
bool isNonLazyPointer() const { return Kind == ARMCP::CPNonLazyPtr; }
bool isStub() const { return Kind == ARMCP::CPStub; }

53
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -179,6 +179,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
setOperationAction(ISD::RET, MVT::Other, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
// Expand mem operations genericly.
setOperationAction(ISD::MEMSET , MVT::Other, Expand);
@ -694,6 +695,31 @@ static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(ARMISD::Wrapper, MVT::i32, Res);
}
SDOperand ARMTargetLowering::LowerGlobalAddressELF(SDOperand Op,
SelectionDAG &DAG) {
MVT::ValueType PtrVT = getPointerTy();
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
Reloc::Model RelocM = getTargetMachine().getRelocationModel();
if (RelocM == Reloc::PIC_) {
bool UseGOTOFF = GV->hasInternalLinkage();
ARMConstantPoolValue *CPV =
new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
SDOperand Chain = Result.getValue(1);
SDOperand GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, PtrVT);
Result = DAG.getNode(ISD::ADD, PtrVT, Result, GOT);
if (!UseGOTOFF)
Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
return Result;
} else {
SDOperand CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
return DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
}
}
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
/// even in dynamic-no-pic mode.
static bool GVIsIndirectSymbol(GlobalValue *GV) {
@ -701,12 +727,12 @@ static bool GVIsIndirectSymbol(GlobalValue *GV) {
(GV->isDeclaration() && !GV->hasNotBeenReadFromBytecode()));
}
SDOperand ARMTargetLowering::LowerGlobalAddress(SDOperand Op,
SelectionDAG &DAG) {
SDOperand ARMTargetLowering::LowerGlobalAddressDarwin(SDOperand Op,
SelectionDAG &DAG) {
MVT::ValueType PtrVT = getPointerTy();
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
Reloc::Model RelocM = getTargetMachine().getRelocationModel();
bool IsIndirect = Subtarget->isTargetDarwin() && GVIsIndirectSymbol(GV);
bool IsIndirect = GVIsIndirectSymbol(GV);
SDOperand CPAddr;
if (RelocM == Reloc::Static)
CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
@ -734,6 +760,22 @@ SDOperand ARMTargetLowering::LowerGlobalAddress(SDOperand Op,
return Result;
}
SDOperand ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDOperand Op,
SelectionDAG &DAG){
assert(Subtarget->isTargetELF() &&
"GLOBAL OFFSET TABLE not implemented for non-ELF targets");
MVT::ValueType PtrVT = getPointerTy();
unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
ARMPCLabelIndex,
ARMCP::CPValue, PCAdj);
SDOperand CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
SDOperand Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
SDOperand PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
}
static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
unsigned VarArgsFrameIndex) {
// vastart just stores the address of the VarArgsFrameIndex slot into the
@ -1198,7 +1240,9 @@ SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: assert(0 && "Don't know how to custom lower this!"); abort();
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::GlobalAddress:
return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
LowerGlobalAddressELF(Op, DAG);
case ISD::CALL: return LowerCALL(Op, DAG);
case ISD::RET: return LowerRET(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
@ -1220,6 +1264,7 @@ SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
return LowerFORMAL_ARGUMENTS(Op, DAG);
case ISD::RETURNADDR: break;
case ISD::FRAMEADDR: break;
case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
}
return SDOperand();
}

4
lib/Target/ARM/ARMISelLowering.h
View File

@ -123,7 +123,9 @@ namespace llvm {
unsigned ARMPCLabelIndex;
SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGlobalAddressDarwin(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGlobalAddressELF(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGLOBAL_OFFSET_TABLE(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerBR_JT(SDOperand Op, SelectionDAG &DAG);
};

2
test/CodeGen/ARM/call.ll
View File

@ -1,5 +1,7 @@
; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm | grep {mov lr, pc}
; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm -mattr=+v5t | grep blx
; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm -mtriple=arm-linux-gnueabi\
; RUN: -relocation-model=pic | grep {PLT}
%t = weak global int ()* null
declare void %g(int, int, int, int)

4
test/CodeGen/ARM/load-global.ll
View File

@ -1,10 +1,12 @@
; RUN: llvm-upgrade < %s | llvm-as | llc -march=arm
; RUN: llvm-upgrade < %s | llvm-as | \
; RUN: llc -mtriple=arm-apple-darwin -relocation-model=dynamic-no-pic | \
; RUN: grep {L_G\$non_lazy_ptr} | wc -l | grep 2
; RUN: llvm-upgrade < %s | llvm-as | \
; RUN: llc -mtriple=arm-apple-darwin -relocation-model=pic | \
; RUN: grep {ldr.*pc} | wc -l | grep 1
; RUN: llvm-upgrade < %s | llvm-as | \
; RUN: llc -mtriple=arm-linux-gnueabi -relocation-model=pic | \
; RUN: grep {GOT} | wc -l | grep 1
%G = external global int