assert(!AFI->isThumb1OnlyFunction() &&
"This emitPrologue does not support Thumb1!");
bool isARM = !AFI->isThumbFunction();
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize();
unsigned NumBytes = MFI->getStackSize();
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
return;
// Allocate the vararg register save area. This is not counted in NumBytes.
- if (VARegSaveSize)
- emitSPUpdate(isARM, MBB, MBBI, dl, TII, -VARegSaveSize,
+ if (ArgRegsSaveSize)
+ emitSPUpdate(isARM, MBB, MBBI, dl, TII, -ArgRegsSaveSize,
MachineInstr::FrameSetup);
if (!AFI->hasStackFrame()) {
"This emitEpilogue does not support Thumb1!");
bool isARM = !AFI->isThumbFunction();
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize();
int NumBytes = (int)MFI->getStackSize();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
MBBI = NewMI;
}
- if (VARegSaveSize)
- emitSPUpdate(isARM, MBB, MBBI, dl, TII, VARegSaveSize);
+ if (ArgRegsSaveSize)
+ emitSPUpdate(isARM, MBB, MBBI, dl, TII, ArgRegsSaveSize);
}
/// getFrameIndexReference - Provide a base+offset reference to an FI slot for
MachineFunction &MF = *MBB.getParent();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
+ bool isVarArg = AFI->getArgRegsSaveSize() > 0;
unsigned NumAlignedDPRCS2Regs = AFI->getNumAlignedDPRCS2Regs();
// The emitPopInst calls below do not insert reloads for the aligned DPRCS2
if (AFI->isThumb1OnlyFunction()) {
// Spill LR if Thumb1 function uses variable length argument lists.
- if (AFI->getVarArgsRegSaveSize() > 0)
+ if (AFI->getArgRegsSaveSize() > 0)
MRI.setPhysRegUsed(ARM::LR);
// Spill R4 if Thumb1 epilogue has to restore SP from FP. We don't know
// local frame.
const ARMFunctionInfo *AFI_Caller = DAG.getMachineFunction().
getInfo<ARMFunctionInfo>();
- if (AFI_Caller->getVarArgsRegSaveSize())
+ if (AFI_Caller->getArgRegsSaveSize())
return false;
// If the callee takes no arguments then go on to check the results of the
void
ARMTargetLowering::computeRegArea(CCState &CCInfo, MachineFunction &MF,
- unsigned &VARegSize, unsigned &VARegSaveSize)
+ unsigned &ArgRegsSize,
+ unsigned &ArgRegsSaveSize)
const {
unsigned NumGPRs;
if (CCInfo.isFirstByValRegValid())
}
unsigned Align = MF.getTarget().getFrameLowering()->getStackAlignment();
- VARegSize = NumGPRs * 4;
- VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
+ ArgRegsSize = NumGPRs * 4;
+ ArgRegsSaveSize = (ArgRegsSize + Align - 1) & ~(Align - 1);
}
// The remaining GPRs hold either the beginning of variable-argument
// If this is a variadic function, the va_list pointer will begin with
// these values; otherwise, this reassembles a (byval) structure that
// was split between registers and memory.
-void
-ARMTargetLowering::VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
- DebugLoc dl, SDValue &Chain,
- const Value *OrigArg,
- unsigned OffsetFromOrigArg,
- unsigned ArgOffset,
- bool ForceMutable) const {
+// Return: The frame index registers were stored into.
+int
+ARMTargetLowering::StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
+ DebugLoc dl, SDValue &Chain,
+ const Value *OrigArg,
+ unsigned OffsetFromOrigArg,
+ unsigned ArgOffset,
+ bool ForceMutable) const {
+
+ // Currently, two use-cases possible:
+ // Case #1. Non var-args function, and we meet first byval parameter.
+ // Setup first unallocated register as first byval register;
+ // eat all remained registers
+ // (these two actions are performed by HandleByVal method).
+ // Then, here, we initialize stack frame with
+ // "store-reg" instructions.
+ // Case #2. Var-args function, that doesn't contain byval parameters.
+ // The same: eat all remained unallocated registers,
+ // initialize stack frame.
+
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
(GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
}
- unsigned VARegSize, VARegSaveSize;
- computeRegArea(CCInfo, MF, VARegSize, VARegSaveSize);
- if (VARegSaveSize) {
- // If this function is vararg, store any remaining integer argument regs
- // to their spots on the stack so that they may be loaded by deferencing
- // the result of va_next.
- AFI->setVarArgsRegSaveSize(VARegSaveSize);
- AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(VARegSaveSize,
- ArgOffset + VARegSaveSize
- - VARegSize,
- false));
- SDValue FIN = DAG.getFrameIndex(AFI->getVarArgsFrameIndex(),
- getPointerTy());
+ unsigned ArgRegsSize, ArgRegsSaveSize;
+ computeRegArea(CCInfo, MF, ArgRegsSize, ArgRegsSaveSize);
+
+ // Store any by-val regs to their spots on the stack so that they may be
+ // loaded by deferencing the result of formal parameter pointer or va_next.
+ // Note: once stack area for byval/varargs registers
+ // was initialized, it can't be initialized again.
+ if (!AFI->getArgRegsSaveSize() && ArgRegsSaveSize) {
+
+ AFI->setArgRegsSaveSize(ArgRegsSaveSize);
+
+ int FrameIndex = MFI->CreateFixedObject(
+ ArgRegsSaveSize,
+ ArgOffset + ArgRegsSaveSize - ArgRegsSize,
+ false);
+ SDValue FIN = DAG.getFrameIndex(FrameIndex, getPointerTy());
SmallVector<SDValue, 4> MemOps;
for (unsigned i = 0; firstRegToSaveIndex < 4; ++firstRegToSaveIndex, ++i) {
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOps[0], MemOps.size());
+ return FrameIndex;
} else
// This will point to the next argument passed via stack.
- AFI->setVarArgsFrameIndex(
- MFI->CreateFixedObject(4, ArgOffset, !ForceMutable));
+ return MFI->CreateFixedObject(4, ArgOffset, !ForceMutable);
+}
+
+// Setup stack frame, the va_list pointer will start from.
+void
+ARMTargetLowering::VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
+ DebugLoc dl, SDValue &Chain,
+ unsigned ArgOffset,
+ bool ForceMutable) const {
+ MachineFunction &MF = DAG.getMachineFunction();
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+
+ // Try to store any remaining integer argument regs
+ // to their spots on the stack so that they may be loaded by deferencing
+ // the result of va_next.
+ // If there is no regs to be stored, just point address after last
+ // argument passed via stack.
+ int FrameIndex =
+ StoreByValRegs(CCInfo, DAG, dl, Chain, 0, 0, ArgOffset, ForceMutable);
+
+ AFI->setVarArgsFrameIndex(FrameIndex);
}
SDValue
// Since they could be overwritten by lowering of arguments in case of
// a tail call.
if (Flags.isByVal()) {
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (!AFI->getVarArgsFrameIndex()) {
- VarArgStyleRegisters(CCInfo, DAG,
- dl, Chain, CurOrigArg,
- Ins[VA.getValNo()].PartOffset,
- VA.getLocMemOffset(),
- true /*force mutable frames*/);
- int VAFrameIndex = AFI->getVarArgsFrameIndex();
- InVals.push_back(DAG.getFrameIndex(VAFrameIndex, getPointerTy()));
- } else {
- int FI = MFI->CreateFixedObject(Flags.getByValSize(),
- VA.getLocMemOffset(), false);
- InVals.push_back(DAG.getFrameIndex(FI, getPointerTy()));
- }
+ int FrameIndex = StoreByValRegs(
+ CCInfo, DAG, dl, Chain, CurOrigArg,
+ Ins[VA.getValNo()].PartOffset,
+ VA.getLocMemOffset(),
+ true /*force mutable frames*/);
+ InVals.push_back(DAG.getFrameIndex(FrameIndex, getPointerTy()));
} else {
int FI = MFI->CreateFixedObject(VA.getLocVT().getSizeInBits()/8,
VA.getLocMemOffset(), true);
// varargs
if (isVarArg)
- VarArgStyleRegisters(CCInfo, DAG, dl, Chain, 0, 0,
+ VarArgStyleRegisters(CCInfo, DAG, dl, Chain,
CCInfo.getNextStackOffset());
return Chain;
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
+ int StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
+ DebugLoc dl, SDValue &Chain,
+ const Value *OrigArg,
+ unsigned OffsetFromOrigArg,
+ unsigned ArgOffset,
+ bool ForceMutable) const;
+
void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
DebugLoc dl, SDValue &Chain,
- const Value *OrigArg,
- unsigned OffsetFromOrigArg,
unsigned ArgOffset,
- bool ForceMutable = false)
- const;
+ bool ForceMutable = false) const;
void computeRegArea(CCState &CCInfo, MachineFunction &MF,
- unsigned &VARegSize, unsigned &VARegSaveSize) const;
+ unsigned &ArgRegsSize,
+ unsigned &ArgRegsSaveSize) const;
virtual SDValue
LowerCall(TargetLowering::CallLoweringInfo &CLI,
/// VarArgsRegSaveSize - Size of the register save area for vararg functions.
///
- unsigned VarArgsRegSaveSize;
+ unsigned ArgRegsSaveSize;
/// HasStackFrame - True if this function has a stack frame. Set by
/// processFunctionBeforeCalleeSavedScan().
ARMFunctionInfo() :
isThumb(false),
hasThumb2(false),
- VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
+ ArgRegsSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
explicit ARMFunctionInfo(MachineFunction &MF) :
isThumb(MF.getTarget().getSubtarget<ARMSubtarget>().isThumb()),
hasThumb2(MF.getTarget().getSubtarget<ARMSubtarget>().hasThumb2()),
- VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
+ ArgRegsSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
bool isThumb1OnlyFunction() const { return isThumb && !hasThumb2; }
bool isThumb2Function() const { return isThumb && hasThumb2; }
- unsigned getVarArgsRegSaveSize() const { return VarArgsRegSaveSize; }
- void setVarArgsRegSaveSize(unsigned s) { VarArgsRegSaveSize = s; }
+ unsigned getArgRegsSaveSize() const { return ArgRegsSaveSize; }
+ void setArgRegsSaveSize(unsigned s) { ArgRegsSaveSize = s; }
bool hasStackFrame() const { return HasStackFrame; }
void setHasStackFrame(bool s) { HasStackFrame = s; }
const Thumb1InstrInfo &TII =
*static_cast<const Thumb1InstrInfo*>(MF.getTarget().getInstrInfo());
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize();
unsigned NumBytes = MFI->getStackSize();
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
int FramePtrSpillFI = 0;
- if (VARegSaveSize)
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -VARegSaveSize,
+ if (ArgRegsSaveSize)
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -ArgRegsSaveSize,
MachineInstr::FrameSetup);
if (!AFI->hasStackFrame()) {
const Thumb1InstrInfo &TII =
*static_cast<const Thumb1InstrInfo*>(MF.getTarget().getInstrInfo());
- unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
+ unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize();
int NumBytes = (int)MFI->getStackSize();
const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
}
}
- if (VARegSaveSize) {
+ if (ArgRegsSaveSize) {
// Unlike T2 and ARM mode, the T1 pop instruction cannot restore
// to LR, and we can't pop the value directly to the PC since
// we need to update the SP after popping the value. Therefore, we
AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)))
.addReg(ARM::R3, RegState::Define);
- emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, VARegSaveSize);
+ emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, ArgRegsSaveSize);
MachineInstrBuilder MIB =
BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
+ bool isVarArg = AFI->getArgRegsSaveSize() > 0;
DebugLoc DL = MI->getDebugLoc();
MachineInstrBuilder MIB = BuildMI(MF, DL, TII.get(ARM::tPOP));
AddDefaultPred(MIB);
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