[llvm-commits] [llvm] r90740 - in /llvm/trunk/lib/Target/MSP430: MSP430ISelLowering.cpp MSP430ISelLowering.h MSP430MachineFunctionInfo.h
Anton Korobeynikov
asl at math.spbu.ru
Sun Dec 6 18:28:11 PST 2009
Author: asl
Date: Sun Dec 6 20:28:10 2009
New Revision: 90740
URL: http://llvm.org/viewvc/llvm-project?rev=90740&view=rev
Log:
Add lowering of returnaddr and frameaddr intrinsics. Shamelessly stolen from x86 :)
Modified:
llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp
llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h
llvm/trunk/lib/Target/MSP430/MSP430MachineFunctionInfo.h
Modified: llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp?rev=90740&r1=90739&r2=90740&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp Sun Dec 6 20:28:10 2009
@@ -15,6 +15,7 @@
#include "MSP430ISelLowering.h"
#include "MSP430.h"
+#include "MSP430MachineFunctionInfo.h"
#include "MSP430TargetMachine.h"
#include "MSP430Subtarget.h"
#include "llvm/DerivedTypes.h"
@@ -62,6 +63,8 @@
TargetLowering(tm, new TargetLoweringObjectFileELF()),
Subtarget(*tm.getSubtargetImpl()), TM(tm) {
+ TD = getTargetData();
+
// Set up the register classes.
addRegisterClass(MVT::i8, MSP430::GR8RegisterClass);
addRegisterClass(MVT::i16, MSP430::GR16RegisterClass);
@@ -183,6 +186,8 @@
case ISD::BR_CC: return LowerBR_CC(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG);
+ case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
+ case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
default:
llvm_unreachable("unimplemented operand");
return SDValue();
@@ -730,6 +735,55 @@
DAG.getValueType(Val.getValueType()));
}
+SDValue MSP430TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) {
+ MachineFunction &MF = DAG.getMachineFunction();
+ MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
+ int ReturnAddrIndex = FuncInfo->getRAIndex();
+
+ if (ReturnAddrIndex == 0) {
+ // Set up a frame object for the return address.
+ uint64_t SlotSize = TD->getPointerSize();
+ ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize, -SlotSize,
+ true, false);
+ FuncInfo->setRAIndex(ReturnAddrIndex);
+ }
+
+ return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy());
+}
+
+SDValue MSP430TargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) {
+ unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+ DebugLoc dl = Op.getDebugLoc();
+
+ if (Depth > 0) {
+ SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
+ SDValue Offset =
+ DAG.getConstant(TD->getPointerSize(), MVT::i16);
+ return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
+ DAG.getNode(ISD::ADD, dl, getPointerTy(),
+ FrameAddr, Offset),
+ NULL, 0);
+ }
+
+ // Just load the return address.
+ SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
+ return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
+ RetAddrFI, NULL, 0);
+}
+
+SDValue MSP430TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
+ MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
+ MFI->setFrameAddressIsTaken(true);
+ EVT VT = Op.getValueType();
+ DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
+ unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+ SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
+ MSP430::FPW, VT);
+ while (Depth--)
+ FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0);
+ return FrameAddr;
+}
+
/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.
Modified: llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h?rev=90740&r1=90739&r2=90740&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h Sun Dec 6 20:28:10 2009
@@ -86,6 +86,9 @@
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
+ SDValue getReturnAddressFrameIndex(SelectionDAG &DAG);
TargetLowering::ConstraintType
getConstraintType(const std::string &Constraint) const;
@@ -147,6 +150,7 @@
const MSP430Subtarget &Subtarget;
const MSP430TargetMachine &TM;
+ const TargetData *TD;
};
} // namespace llvm
Modified: llvm/trunk/lib/Target/MSP430/MSP430MachineFunctionInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430MachineFunctionInfo.h?rev=90740&r1=90739&r2=90740&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430MachineFunctionInfo.h (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430MachineFunctionInfo.h Sun Dec 6 20:28:10 2009
@@ -25,14 +25,20 @@
/// stack frame in bytes.
unsigned CalleeSavedFrameSize;
+ /// ReturnAddrIndex - FrameIndex for return slot.
+ int ReturnAddrIndex;
+
public:
MSP430MachineFunctionInfo() : CalleeSavedFrameSize(0) {}
explicit MSP430MachineFunctionInfo(MachineFunction &MF)
- : CalleeSavedFrameSize(0) {}
+ : CalleeSavedFrameSize(0), ReturnAddrIndex(0) {}
unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
+
+ int getRAIndex() const { return ReturnAddrIndex; }
+ void setRAIndex(int Index) { ReturnAddrIndex = Index; }
};
} // End llvm namespace
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