//===----------------------------------------------------------------------===//
#include "Mips16FrameLowering.h"
-#include "MipsInstrInfo.h"
#include "MCTargetDesc/MipsBaseInfo.h"
-#include "llvm/Function.h"
+#include "Mips16InstrInfo.h"
+#include "MipsInstrInfo.h"
+#include "MipsRegisterInfo.h"
+#include "MipsSubtarget.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetOptions.h"
using namespace llvm;
+Mips16FrameLowering::Mips16FrameLowering(const MipsSubtarget &STI)
+ : MipsFrameLowering(STI, STI.stackAlignment()) {}
+
void Mips16FrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
- const MipsInstrInfo &TII =
- *static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo *>(MF.getSubtarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
uint64_t StackSize = MFI->getStackSize();
- StackSize += 16; // need to allocate space for RA. Clean this up later
- // when we fix the save/restore instruction. TBD..
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
+ MachineModuleInfo &MMI = MF.getMMI();
+ const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
+ MachineLocation DstML, SrcML;
+
// Adjust stack.
- if (isInt<16>(-StackSize))
- BuildMI(MBB, MBBI, dl, TII.get(Mips::SaveRaF16)).addImm(StackSize);
+ TII.makeFrame(Mips::SP, StackSize, MBB, MBBI);
+
+ // emit ".cfi_def_cfa_offset StackSize"
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, -StackSize));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+
+ if (CSI.size()) {
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+
+ for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
+ E = CSI.end(); I != E; ++I) {
+ int64_t Offset = MFI->getObjectOffset(I->getFrameIdx());
+ unsigned Reg = I->getReg();
+ unsigned DReg = MRI->getDwarfRegNum(Reg, true);
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createOffset(nullptr, DReg, Offset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+ }
+ if (hasFP(MF))
+ BuildMI(MBB, MBBI, dl, TII.get(Mips::MoveR3216), Mips::S0)
+ .addReg(Mips::SP).setMIFlag(MachineInstr::FrameSetup);
+
}
void Mips16FrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
- const MipsInstrInfo &TII =
- *static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo *>(MF.getSubtarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
uint64_t StackSize = MFI->getStackSize();
- StackSize += 16; // need to allocate space for RA. Clean this up later
- // when we fix the save/restore instruction. TBD..
if (!StackSize)
return;
+ if (hasFP(MF))
+ BuildMI(MBB, MBBI, dl, TII.get(Mips::Move32R16), Mips::SP)
+ .addReg(Mips::S0);
+
// Adjust stack.
- if (isInt<16>(StackSize))
- // assumes stacksize multiple of 8
- BuildMI(MBB, MBBI, dl, TII.get(Mips::RestoreRaF16)).addImm(StackSize);
+ // assumes stacksize multiple of 8
+ TII.restoreFrame(Mips::SP, StackSize, MBB, MBBI);
}
bool Mips16FrameLowering::
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const {
- // FIXME: implement.
+ MachineFunction *MF = MBB.getParent();
+ MachineBasicBlock *EntryBlock = MF->begin();
+
+ //
+ // Registers RA, S0,S1 are the callee saved registers and they
+ // will be saved with the "save" instruction
+ // during emitPrologue
+ //
+ for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+ // Add the callee-saved register as live-in. Do not add if the register is
+ // RA and return address is taken, because it has already been added in
+ // method MipsTargetLowering::LowerRETURNADDR.
+ // It's killed at the spill, unless the register is RA and return address
+ // is taken.
+ unsigned Reg = CSI[i].getReg();
+ bool IsRAAndRetAddrIsTaken = (Reg == Mips::RA)
+ && MF->getFrameInfo()->isReturnAddressTaken();
+ if (!IsRAAndRetAddrIsTaken)
+ EntryBlock->addLiveIn(Reg);
+ }
+
return true;
}
+bool Mips16FrameLowering::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI,
+ const TargetRegisterInfo *TRI) const {
+ //
+ // Registers RA,S0,S1 are the callee saved registers and they will be restored
+ // with the restore instruction during emitEpilogue.
+ // We need to override this virtual function, otherwise llvm will try and
+ // restore the registers on it's on from the stack.
+ //
+
+ return true;
+}
+
+// Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions
+void Mips16FrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ if (!hasReservedCallFrame(MF)) {
+ int64_t Amount = I->getOperand(0).getImm();
+
+ if (I->getOpcode() == Mips::ADJCALLSTACKDOWN)
+ Amount = -Amount;
+
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo *>(MF.getSubtarget().getInstrInfo());
+
+ TII.adjustStackPtr(Mips::SP, Amount, MBB, I);
+ }
+
+ MBB.erase(I);
+}
+
bool
Mips16FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
- // FIXME: implement.
- return true;
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ // Reserve call frame if the size of the maximum call frame fits into 15-bit
+ // immediate field and there are no variable sized objects on the stack.
+ return isInt<15>(MFI->getMaxCallFrameSize()) && !MFI->hasVarSizedObjects();
}
void Mips16FrameLowering::
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo *>(MF.getSubtarget().getInstrInfo());
+ const MipsRegisterInfo &RI = TII.getRegisterInfo();
+ const BitVector Reserved = RI.getReservedRegs(MF);
+ bool SaveS2 = Reserved[Mips::S2];
+ if (SaveS2)
+ MF.getRegInfo().setPhysRegUsed(Mips::S2);
+ if (hasFP(MF))
+ MF.getRegInfo().setPhysRegUsed(Mips::S0);
}
const MipsFrameLowering *
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