#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
Is64Bit = Subtarget->is64Bit();
IsWin64 = Subtarget->isTargetWin64();
StackAlign = TM.getFrameInfo()->getStackAlignment();
+
if (Is64Bit) {
SlotSize = 8;
StackPtr = X86::RSP;
}
}
-// getDwarfRegNum - This function maps LLVM register identifiers to the
-// Dwarf specific numbering, used in debug info and exception tables.
-
+/// getDwarfRegNum - This function maps LLVM register identifiers to the DWARF
+/// specific numbering, used in debug info and exception tables.
int X86RegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const {
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
unsigned Flavour = DWARFFlavour::X86_64;
+
if (!Subtarget->is64Bit()) {
if (Subtarget->isTargetDarwin()) {
if (isEH)
return X86GenRegisterInfo::getDwarfRegNumFull(RegNo, Flavour);
}
-// getX86RegNum - This function maps LLVM register identifiers to their X86
-// specific numbering, which is used in various places encoding instructions.
-//
+/// getX86RegNum - This function maps LLVM register identifiers to their X86
+/// specific numbering, which is used in various places encoding instructions.
unsigned X86RegisterInfo::getX86RegNum(unsigned RegNo) {
switch(RegNo) {
case X86::RAX: case X86::EAX: case X86::AX: case X86::AL: return N86::EAX;
default:
assert(isVirtualRegister(RegNo) && "Unknown physical register!");
- assert(0 && "Register allocator hasn't allocated reg correctly yet!");
+ llvm_unreachable("Register allocator hasn't allocated reg correctly yet!");
return 0;
}
}
+const TargetRegisterClass *
+X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
+ const TargetRegisterClass *B,
+ unsigned SubIdx) const {
+ switch (SubIdx) {
+ default: return 0;
+ case 1:
+ // 8-bit
+ if (B == &X86::GR8RegClass) {
+ if (A->getSize() == 2 || A->getSize() == 4 || A->getSize() == 8)
+ return A;
+ } else if (B == &X86::GR8_ABCD_LRegClass || B == &X86::GR8_ABCD_HRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_ABCDRegClass;
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
+ A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
+ return &X86::GR32_ABCDRegClass;
+ else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
+ A == &X86::GR16_NOREXRegClass)
+ return &X86::GR16_ABCDRegClass;
+ } else if (B == &X86::GR8_NOREXRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_NOREXRegClass;
+ else if (A == &X86::GR64_ABCDRegClass)
+ return &X86::GR64_ABCDRegClass;
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
+ return &X86::GR32_NOREXRegClass;
+ else if (A == &X86::GR32_ABCDRegClass)
+ return &X86::GR32_ABCDRegClass;
+ else if (A == &X86::GR16RegClass || A == &X86::GR16_NOREXRegClass)
+ return &X86::GR16_NOREXRegClass;
+ else if (A == &X86::GR16_ABCDRegClass)
+ return &X86::GR16_ABCDRegClass;
+ } else if (B == &X86::FR32RegClass) {
+ return A;
+ }
+ break;
+ case 2:
+ // 8-bit hi
+ if (B == &X86::GR8_ABCD_HRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_ABCDRegClass;
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
+ A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
+ return &X86::GR32_ABCDRegClass;
+ else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
+ A == &X86::GR16_NOREXRegClass)
+ return &X86::GR16_ABCDRegClass;
+ } else if (B == &X86::FR64RegClass) {
+ return A;
+ }
+ break;
+ case 3:
+ // 16-bit
+ if (B == &X86::GR16RegClass) {
+ if (A->getSize() == 4 || A->getSize() == 8)
+ return A;
+ } else if (B == &X86::GR16_ABCDRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_ABCDRegClass;
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
+ A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
+ return &X86::GR32_ABCDRegClass;
+ } else if (B == &X86::GR16_NOREXRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_NOREXRegClass;
+ else if (A == &X86::GR64_ABCDRegClass)
+ return &X86::GR64_ABCDRegClass;
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
+ return &X86::GR32_NOREXRegClass;
+ else if (A == &X86::GR32_ABCDRegClass)
+ return &X86::GR64_ABCDRegClass;
+ } else if (B == &X86::VR128RegClass) {
+ return A;
+ }
+ break;
+ case 4:
+ // 32-bit
+ if (B == &X86::GR32RegClass || B == &X86::GR32_NOSPRegClass) {
+ if (A->getSize() == 8)
+ return A;
+ } else if (B == &X86::GR32_ABCDRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_ABCDRegClass;
+ } else if (B == &X86::GR32_NOREXRegClass) {
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
+ return &X86::GR64_NOREXRegClass;
+ else if (A == &X86::GR64_ABCDRegClass)
+ return &X86::GR64_ABCDRegClass;
+ }
+ break;
+ }
+ return 0;
+}
+
+const TargetRegisterClass *
+X86RegisterInfo::getPointerRegClass(unsigned Kind) const {
+ switch (Kind) {
+ default: llvm_unreachable("Unexpected Kind in getPointerRegClass!");
+ case 0: // Normal GPRs.
+ if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ return &X86::GR64RegClass;
+ return &X86::GR32RegClass;
+ case 1: // Normal GRPs except the stack pointer (for encoding reasons).
+ if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ return &X86::GR64_NOSPRegClass;
+ return &X86::GR32_NOSPRegClass;
+ }
+}
+
const TargetRegisterClass *
X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const {
if (RC == &X86::CCRRegClass) {
const unsigned *
X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
bool callsEHReturn = false;
+ bool ghcCall = false;
if (MF) {
- const MachineFrameInfo *MFI = MF->getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
+ callsEHReturn = MF->getMMI().callsEHReturn();
+ const Function *F = MF->getFunction();
+ ghcCall = (F ? F->getCallingConv() == CallingConv::GHC : false);
}
+ static const unsigned GhcCalleeSavedRegs[] = {
+ 0
+ };
+
static const unsigned CalleeSavedRegs32Bit[] = {
X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0
};
X86::XMM14, X86::XMM15, 0
};
- if (Is64Bit) {
+ if (ghcCall) {
+ return GhcCalleeSavedRegs;
+ } else if (Is64Bit) {
if (IsWin64)
return CalleeSavedRegsWin64;
else
const TargetRegisterClass* const*
X86RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
bool callsEHReturn = false;
-
- if (MF) {
- const MachineFrameInfo *MFI = MF->getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
- }
+ if (MF)
+ callsEHReturn = MF->getMMI().callsEHReturn();
static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = {
&X86::GR32RegClass, &X86::GR32RegClass,
Reserved.set(X86::ESP);
Reserved.set(X86::SP);
Reserved.set(X86::SPL);
+
+ // Set the instruction pointer register and its aliases as reserved.
+ Reserved.set(X86::RIP);
+ Reserved.set(X86::EIP);
+ Reserved.set(X86::IP);
+
// Set the frame-pointer register and its aliases as reserved if needed.
if (hasFP(MF)) {
Reserved.set(X86::RBP);
Reserved.set(X86::BP);
Reserved.set(X86::BPL);
}
- // Mark the x87 stack registers as reserved, since they don't
- // behave normally with respect to liveness. We don't fully
- // model the effects of x87 stack pushes and pops after
- // stackification.
+
+ // Mark the x87 stack registers as reserved, since they don't behave normally
+ // with respect to liveness. We don't fully model the effects of x87 stack
+ // pushes and pops after stackification.
Reserved.set(X86::ST0);
Reserved.set(X86::ST1);
Reserved.set(X86::ST2);
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-static unsigned calculateMaxStackAlignment(const MachineFrameInfo *FFI) {
- unsigned MaxAlign = 0;
- for (int i = FFI->getObjectIndexBegin(),
- e = FFI->getObjectIndexEnd(); i != e; ++i) {
- if (FFI->isDeadObjectIndex(i))
- continue;
- unsigned Align = FFI->getObjectAlignment(i);
- MaxAlign = std::max(MaxAlign, Align);
- }
-
- return MaxAlign;
-}
-
-// hasFP - Return true if the specified function should have a dedicated frame
-// pointer register. This is true if the function has variable sized allocas or
-// if frame pointer elimination is disabled.
-//
+/// hasFP - Return true if the specified function should have a dedicated frame
+/// pointer register. This is true if the function has variable sized allocas
+/// or if frame pointer elimination is disabled.
bool X86RegisterInfo::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
+ const MachineModuleInfo &MMI = MF.getMMI();
- return (NoFramePointerElim ||
+ return (DisableFramePointerElim(MF) ||
needsStackRealignment(MF) ||
MFI->hasVarSizedObjects() ||
MFI->isFrameAddressTaken() ||
MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() ||
- (MMI && MMI->callsUnwindInit()));
+ MMI.callsUnwindInit());
+}
+
+bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return (RealignStack &&
+ !MFI->hasVarSizedObjects());
}
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();;
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const Function *F = MF.getFunction();
+ bool requiresRealignment =
+ RealignStack && ((MFI->getMaxAlignment() > StackAlign) ||
+ F->hasFnAttr(Attribute::StackAlignment));
// FIXME: Currently we don't support stack realignment for functions with
- // variable-sized allocas
- return (RealignStack &&
- (MFI->getMaxAlignment() > StackAlign &&
- !MFI->hasVarSizedObjects()));
+ // variable-sized allocas.
+ // FIXME: Temporary disable the error - it seems to be too conservative.
+ if (0 && requiresRealignment && MFI->hasVarSizedObjects())
+ report_fatal_error(
+ "Stack realignment in presense of dynamic allocas is not supported");
+
+ return (requiresRealignment && !MFI->hasVarSizedObjects());
}
bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
return !MF.getFrameInfo()->hasVarSizedObjects();
}
+bool X86RegisterInfo::hasReservedSpillSlot(MachineFunction &MF, unsigned Reg,
+ int &FrameIdx) const {
+ if (Reg == FramePtr && hasFP(MF)) {
+ FrameIdx = MF.getFrameInfo()->getObjectIndexBegin();
+ return true;
+ }
+ return false;
+}
+
int
-X86RegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
- int Offset = MF.getFrameInfo()->getObjectOffset(FI) + SlotSize;
- uint64_t StackSize = MF.getFrameInfo()->getStackSize();
+X86RegisterInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
+ const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ int Offset = MFI->getObjectOffset(FI) - TFI.getOffsetOfLocalArea();
+ uint64_t StackSize = MFI->getStackSize();
if (needsStackRealignment(MF)) {
- if (FI < 0)
- // Skip the saved EBP
+ if (FI < 0) {
+ // Skip the saved EBP.
Offset += SlotSize;
- else {
- unsigned Align = MF.getFrameInfo()->getObjectAlignment(FI);
- assert( (-(Offset + StackSize)) % Align == 0);
+ } else {
+ unsigned Align = MFI->getObjectAlignment(FI);
+ assert((-(Offset + StackSize)) % Align == 0);
Align = 0;
return Offset + StackSize;
}
-
// FIXME: Support tail calls
} else {
if (!hasFP(MF))
return Offset + StackSize;
- // Skip the saved EBP
+ // Skip the saved EBP.
Offset += SlotSize;
// Skip the RETADDR move area
- X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
+ const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
- if (TailCallReturnAddrDelta < 0) Offset -= TailCallReturnAddrDelta;
+ if (TailCallReturnAddrDelta < 0)
+ Offset -= TailCallReturnAddrDelta;
}
return Offset;
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
- Amount = (Amount+StackAlign-1)/StackAlign*StackAlign;
+ Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
MachineInstr *New = 0;
if (Old->getOpcode() == getCallFrameSetupOpcode()) {
- New = BuildMI(MF, TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri),
- StackPtr).addReg(StackPtr).addImm(Amount);
+ New = BuildMI(MF, Old->getDebugLoc(),
+ TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri),
+ StackPtr)
+ .addReg(StackPtr)
+ .addImm(Amount);
} else {
assert(Old->getOpcode() == getCallFrameDestroyOpcode());
- // factor out the amount the callee already popped.
+
+ // Factor out the amount the callee already popped.
uint64_t CalleeAmt = Old->getOperand(1).getImm();
Amount -= CalleeAmt;
- if (Amount) {
+
+ if (Amount) {
unsigned Opc = (Amount < 128) ?
(Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
(Is64Bit ? X86::ADD64ri32 : X86::ADD32ri);
- New = BuildMI(MF, TII.get(Opc), StackPtr)
- .addReg(StackPtr).addImm(Amount);
+ New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr)
+ .addReg(StackPtr)
+ .addImm(Amount);
}
}
- // The EFLAGS implicit def is dead.
- New->getOperand(3).setIsDead();
+ if (New) {
+ // The EFLAGS implicit def is dead.
+ New->getOperand(3).setIsDead();
- // Replace the pseudo instruction with a new instruction...
- if (New) MBB.insert(I, New);
+ // Replace the pseudo instruction with a new instruction.
+ MBB.insert(I, New);
+ }
}
} else if (I->getOpcode() == getCallFrameDestroyOpcode()) {
// If we are performing frame pointer elimination and if the callee pops
unsigned Opc = (CalleeAmt < 128) ?
(Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri);
+ MachineInstr *Old = I;
MachineInstr *New =
- BuildMI(MF, TII.get(Opc), StackPtr).addReg(StackPtr).addImm(CalleeAmt);
+ BuildMI(MF, Old->getDebugLoc(), TII.get(Opc),
+ StackPtr)
+ .addReg(StackPtr)
+ .addImm(CalleeAmt);
+
// The EFLAGS implicit def is dead.
New->getOperand(3).setIsDead();
-
MBB.insert(I, New);
}
}
MBB.erase(I);
}
-void X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const{
+unsigned
+X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, FrameIndexValue *Value,
+ RegScavenger *RS) const{
assert(SPAdj == 0 && "Unexpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
+
while (!MI.getOperand(i).isFI()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
int FrameIndex = MI.getOperand(i).getIndex();
-
unsigned BasePtr;
+
+ unsigned Opc = MI.getOpcode();
+ bool AfterFPPop = Opc == X86::TAILJMPm64 || Opc == X86::TAILJMPm;
if (needsStackRealignment(MF))
BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr);
+ else if (AfterFPPop)
+ BasePtr = StackPtr;
else
BasePtr = (hasFP(MF) ? FramePtr : StackPtr);
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Now add the frame object offset to the offset from EBP.
+ int FIOffset;
+ if (AfterFPPop) {
+ // Tail call jmp happens after FP is popped.
+ const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ FIOffset = MFI->getObjectOffset(FrameIndex) - TFI.getOffsetOfLocalArea();
+ } else
+ FIOffset = getFrameIndexOffset(MF, FrameIndex);
+
if (MI.getOperand(i+3).isImm()) {
// Offset is a 32-bit integer.
- int Offset = getFrameIndexOffset(MF, FrameIndex) +
- (int)(MI.getOperand(i+3).getImm());
-
- MI.getOperand(i+3).ChangeToImmediate(Offset);
+ int Offset = FIOffset + (int)(MI.getOperand(i + 3).getImm());
+ MI.getOperand(i + 3).ChangeToImmediate(Offset);
} else {
// Offset is symbolic. This is extremely rare.
- uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) +
- (uint64_t)MI.getOperand(i+3).getOffset();
+ uint64_t Offset = FIOffset + (uint64_t)MI.getOperand(i+3).getOffset();
MI.getOperand(i+3).setOffset(Offset);
}
+ return 0;
}
void
X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
- MachineFrameInfo *FFI = MF.getFrameInfo();
-
- // Calculate and set max stack object alignment early, so we can decide
- // whether we will need stack realignment (and thus FP).
- unsigned MaxAlign = std::max(FFI->getMaxAlignment(),
- calculateMaxStackAlignment(FFI));
-
- FFI->setMaxAlignment(MaxAlign);
-}
+ MachineFrameInfo *MFI = MF.getFrameInfo();
-void
-X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
+
if (TailCallReturnAddrDelta < 0) {
// create RETURNADDR area
// arg
// ...
// }
// [EBP]
- MF.getFrameInfo()->
- CreateFixedObject(-TailCallReturnAddrDelta,
- (-1*SlotSize)+TailCallReturnAddrDelta);
+ MFI->CreateFixedObject(-TailCallReturnAddrDelta,
+ (-1U*SlotSize)+TailCallReturnAddrDelta,
+ true, false);
}
+
if (hasFP(MF)) {
assert((TailCallReturnAddrDelta <= 0) &&
"The Delta should always be zero or negative");
+ const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
+
// Create a frame entry for the EBP register that must be saved.
- int FrameIdx = MF.getFrameInfo()->CreateFixedObject(SlotSize,
- (int)SlotSize * -2+
- TailCallReturnAddrDelta);
- assert(FrameIdx == MF.getFrameInfo()->getObjectIndexBegin() &&
+ int FrameIdx = MFI->CreateFixedObject(SlotSize,
+ -(int)SlotSize +
+ TFI.getOffsetOfLocalArea() +
+ TailCallReturnAddrDelta,
+ true, false);
+ assert(FrameIdx == MFI->getObjectIndexBegin() &&
"Slot for EBP register must be last in order to be found!");
FrameIdx = 0;
}
(Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
(Is64Bit ? X86::ADD64ri32 : X86::ADD32ri));
uint64_t Chunk = (1LL << 31) - 1;
+ DebugLoc DL = MBB.findDebugLoc(MBBI);
while (Offset) {
uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
MachineInstr *MI =
- BuildMI(MBB, MBBI, TII.get(Opc), StackPtr).addReg(StackPtr).addImm(ThisVal);
- // The EFLAGS implicit def is dead.
- MI->getOperand(3).setIsDead();
+ BuildMI(MBB, MBBI, DL, TII.get(Opc), StackPtr)
+ .addReg(StackPtr)
+ .addImm(ThisVal);
+ MI->getOperand(3).setIsDead(); // The EFLAGS implicit def is dead.
Offset -= ThisVal;
}
}
-// mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator.
+/// mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator.
static
void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
unsigned StackPtr, uint64_t *NumBytes = NULL) {
}
}
-// mergeSPUpdatesUp - Merge two stack-manipulating instructions lower iterator.
+/// mergeSPUpdatesUp - Merge two stack-manipulating instructions lower iterator.
static
void mergeSPUpdatesDown(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
unsigned StackPtr, uint64_t *NumBytes = NULL) {
+ // FIXME: THIS ISN'T RUN!!!
return;
if (MBBI == MBB.end()) return;
- MachineBasicBlock::iterator NI = next(MBBI);
+ MachineBasicBlock::iterator NI = llvm::next(MBBI);
if (NI == MBB.end()) return;
unsigned Opc = NI->getOpcode();
}
/// mergeSPUpdates - Checks the instruction before/after the passed
-/// instruction. If it is an ADD/SUB instruction it is deleted
-/// argument and the stack adjustment is returned as a positive value for ADD
-/// and a negative for SUB.
+/// instruction. If it is an ADD/SUB instruction it is deleted argument and the
+/// stack adjustment is returned as a positive value for ADD and a negative for
+/// SUB.
static int mergeSPUpdates(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
unsigned StackPtr,
bool doMergeWithPrevious) {
-
if ((doMergeWithPrevious && MBBI == MBB.begin()) ||
(!doMergeWithPrevious && MBBI == MBB.end()))
return 0;
- int Offset = 0;
-
MachineBasicBlock::iterator PI = doMergeWithPrevious ? prior(MBBI) : MBBI;
- MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : next(MBBI);
+ MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : llvm::next(MBBI);
unsigned Opc = PI->getOpcode();
+ int Offset = 0;
+
if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 ||
Opc == X86::ADD32ri || Opc == X86::ADD32ri8) &&
PI->getOperand(0).getReg() == StackPtr){
return Offset;
}
-void X86RegisterInfo::emitFrameMoves(MachineFunction &MF,
- unsigned FrameLabelId,
- unsigned ReadyLabelId) const {
+void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF,
+ MCSymbol *Label,
+ unsigned FramePtr) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- if (!MMI)
- return;
+ MachineModuleInfo &MMI = MF.getMMI();
- uint64_t StackSize = MFI->getStackSize();
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
+ // Add callee saved registers to move list.
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+ if (CSI.empty()) return;
+
+ std::vector<MachineMove> &Moves = MMI.getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
+ bool HasFP = hasFP(MF);
- // Calculate amount of bytes used for return address storing
+ // Calculate amount of bytes used for return address storing.
int stackGrowth =
(MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
- if (StackSize) {
- // Show update of SP.
- if (hasFP(MF)) {
- // Adjust SP
- MachineLocation SPDst(MachineLocation::VirtualFP);
- MachineLocation SPSrc(MachineLocation::VirtualFP, 2*stackGrowth);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
- } else {
- MachineLocation SPDst(MachineLocation::VirtualFP);
- MachineLocation SPSrc(MachineLocation::VirtualFP,
- -StackSize+stackGrowth);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
- }
- } else {
- //FIXME: Verify & implement for FP
- MachineLocation SPDst(StackPtr);
- MachineLocation SPSrc(StackPtr, stackGrowth);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
- }
-
- // Add callee saved registers to move list.
- const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
-
// FIXME: This is dirty hack. The code itself is pretty mess right now.
// It should be rewritten from scratch and generalized sometimes.
- // Determine maximum offset (minumum due to stack growth)
+ // Determine maximum offset (minumum due to stack growth).
int64_t MaxOffset = 0;
- for (unsigned I = 0, E = CSI.size(); I!=E; ++I)
+ for (std::vector<CalleeSavedInfo>::const_iterator
+ I = CSI.begin(), E = CSI.end(); I != E; ++I)
MaxOffset = std::min(MaxOffset,
- MFI->getObjectOffset(CSI[I].getFrameIdx()));
-
- // Calculate offsets
- int64_t saveAreaOffset = (hasFP(MF) ? 3 : 2)*stackGrowth;
- for (unsigned I = 0, E = CSI.size(); I!=E; ++I) {
- int64_t Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
- unsigned Reg = CSI[I].getReg();
- Offset = (MaxOffset-Offset+saveAreaOffset);
+ MFI->getObjectOffset(I->getFrameIdx()));
+
+ // Calculate offsets.
+ int64_t saveAreaOffset = (HasFP ? 3 : 2) * stackGrowth;
+ 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();
+ Offset = MaxOffset - Offset + saveAreaOffset;
+
+ // Don't output a new machine move if we're re-saving the frame
+ // pointer. This happens when the PrologEpilogInserter has inserted an extra
+ // "PUSH" of the frame pointer -- the "emitPrologue" method automatically
+ // generates one when frame pointers are used. If we generate a "machine
+ // move" for this extra "PUSH", the linker will lose track of the fact that
+ // the frame pointer should have the value of the first "PUSH" when it's
+ // trying to unwind.
+ //
+ // FIXME: This looks inelegant. It's possibly correct, but it's covering up
+ // another bug. I.e., one where we generate a prolog like this:
+ //
+ // pushl %ebp
+ // movl %esp, %ebp
+ // pushl %ebp
+ // pushl %esi
+ // ...
+ //
+ // The immediate re-push of EBP is unnecessary. At the least, it's an
+ // optimization bug. EBP can be used as a scratch register in certain
+ // cases, but probably not when we have a frame pointer.
+ if (HasFP && FramePtr == Reg)
+ continue;
+
MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
MachineLocation CSSrc(Reg);
- Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
+ Moves.push_back(MachineMove(Label, CSDst, CSSrc));
}
-
- if (hasFP(MF)) {
- // Save FP
- MachineLocation FPDst(MachineLocation::VirtualFP, 2*stackGrowth);
- MachineLocation FPSrc(FramePtr);
- Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
- }
-
- MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
- MachineLocation FPSrc(MachineLocation::VirtualFP);
- Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
-
+/// emitPrologue - Push callee-saved registers onto the stack, which
+/// automatically adjust the stack pointer. Adjust the stack pointer to allocate
+/// space for local variables. Also emit labels used by the exception handler to
+/// generate the exception handling frames.
void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
+ MachineBasicBlock &MBB = MF.front(); // Prologue goes in entry BB.
+ MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
- const Function* Fn = MF.getFunction();
- const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
+ const Function *Fn = MF.getFunction();
+ const X86Subtarget *Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
+ MachineModuleInfo &MMI = MF.getMMI();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
- MachineBasicBlock::iterator MBBI = MBB.begin();
- bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
- !Fn->doesNotThrow() ||
- UnwindTablesMandatory;
- // Prepare for frame info.
- unsigned FrameLabelId = 0;
-
- // Get the number of bytes to allocate from the FrameInfo.
- uint64_t StackSize = MFI->getStackSize();
- // Get desired stack alignment
- uint64_t MaxAlign = MFI->getMaxAlignment();
+ bool needsFrameMoves = MMI.hasDebugInfo() ||
+ !Fn->doesNotThrow() || UnwindTablesMandatory;
+ uint64_t MaxAlign = MFI->getMaxAlignment(); // Desired stack alignment.
+ uint64_t StackSize = MFI->getStackSize(); // Number of bytes to allocate.
+ bool HasFP = hasFP(MF);
+ DebugLoc DL;
// Add RETADDR move area to callee saved frame size.
int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
if (TailCallReturnAddrDelta < 0)
X86FI->setCalleeSavedFrameSize(
- X86FI->getCalleeSavedFrameSize() +(-TailCallReturnAddrDelta));
+ X86FI->getCalleeSavedFrameSize() - TailCallReturnAddrDelta);
// If this is x86-64 and the Red Zone is not disabled, if we are a leaf
// function, and use up to 128 bytes of stack space, don't have a frame
// pointer, calls, or dynamic alloca then we do not need to adjust the
// stack pointer (we fit in the Red Zone).
- if (Is64Bit && !DisableRedZone &&
+ if (Is64Bit && !Fn->hasFnAttr(Attribute::NoRedZone) &&
!needsStackRealignment(MF) &&
!MFI->hasVarSizedObjects() && // No dynamic alloca.
- !MFI->hasCalls()) { // No calls.
+ !MFI->adjustsStack() && // No calls.
+ !Subtarget->isTargetWin64()) { // Win64 has no Red Zone
uint64_t MinSize = X86FI->getCalleeSavedFrameSize();
- if (hasFP(MF)) MinSize += SlotSize;
- StackSize = std::max(MinSize,
- StackSize > 128 ? StackSize - 128 : 0);
+ if (HasFP) MinSize += SlotSize;
+ StackSize = std::max(MinSize, StackSize > 128 ? StackSize - 128 : 0);
+ MFI->setStackSize(StackSize);
+ } else if (Subtarget->isTargetWin64()) {
+ // We need to always allocate 32 bytes as register spill area.
+ // FIXME: We might reuse these 32 bytes for leaf functions.
+ StackSize += 32;
MFI->setStackSize(StackSize);
}
// size is bigger than the callers.
if (TailCallReturnAddrDelta < 0) {
MachineInstr *MI =
- BuildMI(MBB, MBBI, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri),
- StackPtr).addReg(StackPtr).addImm(-TailCallReturnAddrDelta);
- // The EFLAGS implicit def is dead.
- MI->getOperand(3).setIsDead();
+ BuildMI(MBB, MBBI, DL, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri),
+ StackPtr)
+ .addReg(StackPtr)
+ .addImm(-TailCallReturnAddrDelta);
+ MI->getOperand(3).setIsDead(); // The EFLAGS implicit def is dead.
}
+ // Mapping for machine moves:
+ //
+ // DST: VirtualFP AND
+ // SRC: VirtualFP => DW_CFA_def_cfa_offset
+ // ELSE => DW_CFA_def_cfa
+ //
+ // SRC: VirtualFP AND
+ // DST: Register => DW_CFA_def_cfa_register
+ //
+ // ELSE
+ // OFFSET < 0 => DW_CFA_offset_extended_sf
+ // REG < 64 => DW_CFA_offset + Reg
+ // ELSE => DW_CFA_offset_extended
+
+ std::vector<MachineMove> &Moves = MMI.getFrameMoves();
+ const TargetData *TD = MF.getTarget().getTargetData();
uint64_t NumBytes = 0;
- if (hasFP(MF)) {
- // Calculate required stack adjustment
+ int stackGrowth = -TD->getPointerSize();
+
+ if (HasFP) {
+ // Calculate required stack adjustment.
uint64_t FrameSize = StackSize - SlotSize;
if (needsStackRealignment(MF))
- FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign;
+ FrameSize = (FrameSize + MaxAlign - 1) / MaxAlign * MaxAlign;
NumBytes = FrameSize - X86FI->getCalleeSavedFrameSize();
- // Get the offset of the stack slot for the EBP register... which is
+ // Get the offset of the stack slot for the EBP register, which is
// guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
// Update the frame offset adjustment.
MFI->setOffsetAdjustment(-NumBytes);
- // Save EBP into the appropriate stack slot...
- BuildMI(MBB, MBBI, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r))
- .addReg(FramePtr, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true);
+ // Save EBP/RBP into the appropriate stack slot.
+ BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r))
+ .addReg(FramePtr, RegState::Kill);
if (needsFrameMoves) {
- // Mark effective beginning of when frame pointer becomes valid.
- FrameLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
+ // Mark the place where EBP/RBP was saved.
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
+
+ // Define the current CFA rule to use the provided offset.
+ if (StackSize) {
+ MachineLocation SPDst(MachineLocation::VirtualFP);
+ MachineLocation SPSrc(MachineLocation::VirtualFP, 2 * stackGrowth);
+ Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
+ } else {
+ // FIXME: Verify & implement for FP
+ MachineLocation SPDst(StackPtr);
+ MachineLocation SPSrc(StackPtr, stackGrowth);
+ Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
+ }
+
+ // Change the rule for the FramePtr to be an "offset" rule.
+ MachineLocation FPDst(MachineLocation::VirtualFP, 2 * stackGrowth);
+ MachineLocation FPSrc(FramePtr);
+ Moves.push_back(MachineMove(FrameLabel, FPDst, FPSrc));
}
// Update EBP with the new base value...
- BuildMI(MBB, MBBI, TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr)
- .addReg(StackPtr);
+ BuildMI(MBB, MBBI, DL,
+ TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr)
+ .addReg(StackPtr);
+
+ if (needsFrameMoves) {
+ // Mark effective beginning of when frame pointer becomes valid.
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
+
+ // Define the current CFA to use the EBP/RBP register.
+ MachineLocation FPDst(FramePtr);
+ MachineLocation FPSrc(MachineLocation::VirtualFP);
+ Moves.push_back(MachineMove(FrameLabel, FPDst, FPSrc));
+ }
// Mark the FramePtr as live-in in every block except the entry.
- for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
+ for (MachineFunction::iterator I = llvm::next(MF.begin()), E = MF.end();
I != E; ++I)
I->addLiveIn(FramePtr);
// Realign stack
if (needsStackRealignment(MF)) {
MachineInstr *MI =
- BuildMI(MBB, MBBI,
+ BuildMI(MBB, MBBI, DL,
TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri),
StackPtr).addReg(StackPtr).addImm(-MaxAlign);
+
// The EFLAGS implicit def is dead.
MI->getOperand(3).setIsDead();
}
- } else
+ } else {
NumBytes = StackSize - X86FI->getCalleeSavedFrameSize();
-
- unsigned ReadyLabelId = 0;
- if (needsFrameMoves) {
- // Mark effective beginning of when frame pointer is ready.
- ReadyLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, TII.get(X86::DBG_LABEL)).addImm(ReadyLabelId);
}
// Skip the callee-saved push instructions.
+ bool PushedRegs = false;
+ int StackOffset = 2 * stackGrowth;
+
while (MBBI != MBB.end() &&
(MBBI->getOpcode() == X86::PUSH32r ||
- MBBI->getOpcode() == X86::PUSH64r))
+ MBBI->getOpcode() == X86::PUSH64r)) {
+ PushedRegs = true;
++MBBI;
- if (NumBytes) { // adjust stack pointer: ESP -= numbytes
- if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
- // Check, whether EAX is livein for this function
- bool isEAXAlive = false;
- for (MachineRegisterInfo::livein_iterator
+ if (!HasFP && needsFrameMoves) {
+ // Mark callee-saved push instruction.
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
+
+ // Define the current CFA rule to use the provided offset.
+ unsigned Ptr = StackSize ?
+ MachineLocation::VirtualFP : StackPtr;
+ MachineLocation SPDst(Ptr);
+ MachineLocation SPSrc(Ptr, StackOffset);
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
+ StackOffset += stackGrowth;
+ }
+ }
+
+ DL = MBB.findDebugLoc(MBBI);
+
+ // Adjust stack pointer: ESP -= numbytes.
+ if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
+ // Check, whether EAX is livein for this function.
+ bool isEAXAlive = false;
+ for (MachineRegisterInfo::livein_iterator
II = MF.getRegInfo().livein_begin(),
EE = MF.getRegInfo().livein_end(); (II != EE) && !isEAXAlive; ++II) {
- unsigned Reg = II->first;
- isEAXAlive = (Reg == X86::EAX || Reg == X86::AX ||
- Reg == X86::AH || Reg == X86::AL);
- }
+ unsigned Reg = II->first;
+ isEAXAlive = (Reg == X86::EAX || Reg == X86::AX ||
+ Reg == X86::AH || Reg == X86::AL);
+ }
- // Function prologue calls _alloca to probe the stack when allocating
- // more than 4k bytes in one go. Touching the stack at 4K increments is
- // necessary to ensure that the guard pages used by the OS virtual memory
- // manager are allocated in correct sequence.
- if (!isEAXAlive) {
- BuildMI(MBB, MBBI, TII.get(X86::MOV32ri), X86::EAX).addImm(NumBytes);
- BuildMI(MBB, MBBI, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
- } else {
- // Save EAX
- BuildMI(MBB, MBBI, TII.get(X86::PUSH32r))
- .addReg(X86::EAX, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true);
- // Allocate NumBytes-4 bytes on stack. We'll also use 4 already
- // allocated bytes for EAX.
- BuildMI(MBB, MBBI, TII.get(X86::MOV32ri), X86::EAX).addImm(NumBytes-4);
- BuildMI(MBB, MBBI, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
- // Restore EAX
- MachineInstr *MI = addRegOffset(BuildMI(MF, TII.get(X86::MOV32rm),X86::EAX),
- StackPtr, false, NumBytes-4);
- MBB.insert(MBBI, MI);
- }
+ // Function prologue calls _alloca to probe the stack when allocating more
+ // than 4k bytes in one go. Touching the stack at 4K increments is necessary
+ // to ensure that the guard pages used by the OS virtual memory manager are
+ // allocated in correct sequence.
+ if (!isEAXAlive) {
+ BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
+ .addImm(NumBytes);
+ BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
+ .addExternalSymbol("_alloca")
+ .addReg(StackPtr, RegState::Define | RegState::Implicit);
} else {
- // If there is an SUB32ri of ESP immediately before this instruction,
- // merge the two. This can be the case when tail call elimination is
- // enabled and the callee has more arguments then the caller.
- NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true);
- // If there is an ADD32ri or SUB32ri of ESP immediately after this
- // instruction, merge the two instructions.
- mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes);
-
- if (NumBytes)
- emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
+ // Save EAX
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
+ .addReg(X86::EAX, RegState::Kill);
+
+ // Allocate NumBytes-4 bytes on stack. We'll also use 4 already
+ // allocated bytes for EAX.
+ BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
+ .addImm(NumBytes - 4);
+ BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
+ .addExternalSymbol("_alloca")
+ .addReg(StackPtr, RegState::Define | RegState::Implicit);
+
+ // Restore EAX
+ MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
+ X86::EAX),
+ StackPtr, false, NumBytes - 4);
+ MBB.insert(MBBI, MI);
}
+ } else if (NumBytes) {
+ // If there is an SUB32ri of ESP immediately before this instruction, merge
+ // the two. This can be the case when tail call elimination is enabled and
+ // the callee has more arguments then the caller.
+ NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true);
+
+ // If there is an ADD32ri or SUB32ri of ESP immediately after this
+ // instruction, merge the two instructions.
+ mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes);
+
+ if (NumBytes)
+ emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
}
- if (needsFrameMoves)
- emitFrameMoves(MF, FrameLabelId, ReadyLabelId);
+ if ((NumBytes || PushedRegs) && needsFrameMoves) {
+ // Mark end of stack pointer adjustment.
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
+
+ if (!HasFP && NumBytes) {
+ // Define the current CFA rule to use the provided offset.
+ if (StackSize) {
+ MachineLocation SPDst(MachineLocation::VirtualFP);
+ MachineLocation SPSrc(MachineLocation::VirtualFP,
+ -StackSize + stackGrowth);
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
+ } else {
+ // FIXME: Verify & implement for FP
+ MachineLocation SPDst(StackPtr);
+ MachineLocation SPSrc(StackPtr, stackGrowth);
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
+ }
+ }
+
+ // Emit DWARF info specifying the offsets of the callee-saved registers.
+ if (PushedRegs)
+ emitCalleeSavedFrameMoves(MF, Label, HasFP ? FramePtr : StackPtr);
+ }
}
void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
MachineBasicBlock::iterator MBBI = prior(MBB.end());
unsigned RetOpcode = MBBI->getOpcode();
+ DebugLoc DL = MBBI->getDebugLoc();
switch (RetOpcode) {
+ default:
+ llvm_unreachable("Can only insert epilog into returning blocks");
case X86::RET:
case X86::RETI:
case X86::TCRETURNdi:
case X86::TCRETURNri:
- case X86::TCRETURNri64:
+ case X86::TCRETURNmi:
case X86::TCRETURNdi64:
+ case X86::TCRETURNri64:
+ case X86::TCRETURNmi64:
case X86::EH_RETURN:
case X86::EH_RETURN64:
- case X86::TAILJMPd:
- case X86::TAILJMPr:
- case X86::TAILJMPm: break; // These are ok
- default:
- assert(0 && "Can only insert epilog into returning blocks");
+ break; // These are ok
}
- // Get the number of bytes to allocate from the FrameInfo
+ // Get the number of bytes to allocate from the FrameInfo.
uint64_t StackSize = MFI->getStackSize();
uint64_t MaxAlign = MFI->getMaxAlignment();
unsigned CSSize = X86FI->getCalleeSavedFrameSize();
uint64_t NumBytes = 0;
if (hasFP(MF)) {
- // Calculate required stack adjustment
+ // Calculate required stack adjustment.
uint64_t FrameSize = StackSize - SlotSize;
if (needsStackRealignment(MF))
FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign;
NumBytes = FrameSize - CSSize;
- // pop EBP.
- BuildMI(MBB, MBBI, TII.get(Is64Bit ? X86::POP64r : X86::POP32r), FramePtr);
- } else
+ // Pop EBP.
+ BuildMI(MBB, MBBI, DL,
+ TII.get(Is64Bit ? X86::POP64r : X86::POP32r), FramePtr);
+ } else {
NumBytes = StackSize - CSSize;
+ }
// Skip the callee-saved pop instructions.
MachineBasicBlock::iterator LastCSPop = MBBI;
while (MBBI != MBB.begin()) {
MachineBasicBlock::iterator PI = prior(MBBI);
unsigned Opc = PI->getOpcode();
+
if (Opc != X86::POP32r && Opc != X86::POP64r &&
!PI->getDesc().isTerminator())
break;
+
--MBBI;
}
+ DL = MBBI->getDebugLoc();
+
// If there is an ADD32ri or SUB32ri of ESP immediately before this
// instruction, merge the two instructions.
if (NumBytes || MFI->hasVarSizedObjects())
// If dynamic alloca is used, then reset esp to point to the last callee-saved
// slot before popping them off! Same applies for the case, when stack was
- // realigned
+ // realigned.
if (needsStackRealignment(MF)) {
// We cannot use LEA here, because stack pointer was realigned. We need to
- // deallocate local frame back
+ // deallocate local frame back.
if (CSSize) {
emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
MBBI = prior(LastCSPop);
}
- BuildMI(MBB, MBBI,
+ BuildMI(MBB, MBBI, DL,
TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
StackPtr).addReg(FramePtr);
} else if (MFI->hasVarSizedObjects()) {
if (CSSize) {
unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r;
- MachineInstr *MI = addRegOffset(BuildMI(MF, TII.get(Opc), StackPtr),
- FramePtr, false, -CSSize);
+ MachineInstr *MI =
+ addLeaRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr),
+ FramePtr, false, -CSSize);
MBB.insert(MBBI, MI);
- } else
- BuildMI(MBB, MBBI, TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
- StackPtr).addReg(FramePtr);
-
- } else {
- // adjust stack pointer back: ESP += numbytes
- if (NumBytes)
- emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
+ } else {
+ BuildMI(MBB, MBBI, DL,
+ TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), StackPtr)
+ .addReg(FramePtr);
+ }
+ } else if (NumBytes) {
+ // Adjust stack pointer back: ESP += numbytes.
+ emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
}
// We're returning from function via eh_return.
MBBI = prior(MBB.end());
MachineOperand &DestAddr = MBBI->getOperand(0);
assert(DestAddr.isReg() && "Offset should be in register!");
- BuildMI(MBB, MBBI,
+ BuildMI(MBB, MBBI, DL,
TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
StackPtr).addReg(DestAddr.getReg());
- // Tail call return: adjust the stack pointer and jump to callee
} else if (RetOpcode == X86::TCRETURNri || RetOpcode == X86::TCRETURNdi ||
- RetOpcode== X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64) {
+ RetOpcode == X86::TCRETURNmi ||
+ RetOpcode == X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64 ||
+ RetOpcode == X86::TCRETURNmi64) {
+ bool isMem = RetOpcode == X86::TCRETURNmi || RetOpcode == X86::TCRETURNmi64;
+ // Tail call return: adjust the stack pointer and jump to callee.
MBBI = prior(MBB.end());
MachineOperand &JumpTarget = MBBI->getOperand(0);
- MachineOperand &StackAdjust = MBBI->getOperand(1);
+ MachineOperand &StackAdjust = MBBI->getOperand(isMem ? 5 : 1);
assert(StackAdjust.isImm() && "Expecting immediate value.");
// Adjust stack pointer.
int MaxTCDelta = X86FI->getTCReturnAddrDelta();
int Offset = 0;
assert(MaxTCDelta <= 0 && "MaxTCDelta should never be positive");
+
// Incoporate the retaddr area.
Offset = StackAdj-MaxTCDelta;
assert(Offset >= 0 && "Offset should never be negative");
+
if (Offset) {
// Check for possible merge with preceeding ADD instruction.
Offset += mergeSPUpdates(MBB, MBBI, StackPtr, true);
emitSPUpdate(MBB, MBBI, StackPtr, Offset, Is64Bit, TII);
}
+
// Jump to label or value in register.
- if (RetOpcode == X86::TCRETURNdi|| RetOpcode == X86::TCRETURNdi64)
- BuildMI(MBB, MBBI, TII.get(X86::TAILJMPd)).
- addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
- else if (RetOpcode== X86::TCRETURNri64) {
- BuildMI(MBB, MBBI, TII.get(X86::TAILJMPr64), JumpTarget.getReg());
- } else
- BuildMI(MBB, MBBI, TII.get(X86::TAILJMPr), JumpTarget.getReg());
+ if (RetOpcode == X86::TCRETURNdi || RetOpcode == X86::TCRETURNdi64) {
+ BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNdi)
+ ? X86::TAILJMPd : X86::TAILJMPd64)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
+ JumpTarget.getTargetFlags());
+ } else if (RetOpcode == X86::TCRETURNmi || RetOpcode == X86::TCRETURNmi64) {
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNmi)
+ ? X86::TAILJMPm : X86::TAILJMPm64));
+ for (unsigned i = 0; i != 5; ++i)
+ MIB.addOperand(MBBI->getOperand(i));
+ } else if (RetOpcode == X86::TCRETURNri64) {
+ BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64), JumpTarget.getReg());
+ } else {
+ BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg());
+ }
+
+ MachineInstr *NewMI = prior(MBBI);
+ for (unsigned i = 2, e = MBBI->getNumOperands(); i != e; ++i)
+ NewMI->addOperand(MBBI->getOperand(i));
+
// Delete the pseudo instruction TCRETURN.
MBB.erase(MBBI);
} else if ((RetOpcode == X86::RET || RetOpcode == X86::RETI) &&
// Add the return addr area delta back since we are not tail calling.
int delta = -1*X86FI->getTCReturnAddrDelta();
MBBI = prior(MBB.end());
+
// Check for possible merge with preceeding ADD instruction.
delta += mergeSPUpdates(MBB, MBBI, StackPtr, true);
emitSPUpdate(MBB, MBBI, StackPtr, delta, Is64Bit, TII);
}
unsigned X86RegisterInfo::getRARegister() const {
- if (Is64Bit)
- return X86::RIP; // Should have dwarf #16
- else
- return X86::EIP; // Should have dwarf #8
+ return Is64Bit ? X86::RIP // Should have dwarf #16.
+ : X86::EIP; // Should have dwarf #8.
}
-unsigned X86RegisterInfo::getFrameRegister(MachineFunction &MF) const {
+unsigned X86RegisterInfo::getFrameRegister(const MachineFunction &MF) const {
return hasFP(MF) ? FramePtr : StackPtr;
}
-void X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
- const {
+void
+X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) const {
// Calculate amount of bytes used for return address storing
int stackGrowth = (Is64Bit ? -8 : -4);
- // Initial state of the frame pointer is esp+4.
+ // Initial state of the frame pointer is esp+stackGrowth.
MachineLocation Dst(MachineLocation::VirtualFP);
MachineLocation Src(StackPtr, stackGrowth);
Moves.push_back(MachineMove(0, Dst, Src));
}
unsigned X86RegisterInfo::getEHExceptionRegister() const {
- assert(0 && "What is the exception register");
+ llvm_unreachable("What is the exception register");
return 0;
}
unsigned X86RegisterInfo::getEHHandlerRegister() const {
- assert(0 && "What is the exception handler register");
+ llvm_unreachable("What is the exception handler register");
return 0;
}
namespace llvm {
-unsigned getX86SubSuperRegister(unsigned Reg, MVT VT, bool High) {
- switch (VT.getSimpleVT()) {
+unsigned getX86SubSuperRegister(unsigned Reg, EVT VT, bool High) {
+ switch (VT.getSimpleVT().SimpleTy) {
default: return Reg;
case MVT::i8:
if (High) {
#include "X86GenRegisterInfo.inc"
namespace {
- struct VISIBILITY_HIDDEN MSAC : public MachineFunctionPass {
+ struct MSAH : public MachineFunctionPass {
static char ID;
- MSAC() : MachineFunctionPass(&ID) {}
+ MSAH() : MachineFunctionPass(&ID) {}
virtual bool runOnMachineFunction(MachineFunction &MF) {
- MachineFrameInfo *FFI = MF.getFrameInfo();
+ const X86TargetMachine *TM =
+ static_cast<const X86TargetMachine *>(&MF.getTarget());
+ const X86RegisterInfo *X86RI = TM->getRegisterInfo();
MachineRegisterInfo &RI = MF.getRegInfo();
+ X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
+ unsigned StackAlignment = X86RI->getStackAlignment();
- // Calculate max stack alignment of all already allocated stack objects.
- unsigned MaxAlign = calculateMaxStackAlignment(FFI);
-
- // Be over-conservative: scan over all vreg defs and find, whether vector
- // registers are used. If yes - there is probability, that vector register
- // will be spilled and thus stack needs to be aligned properly.
+ // Be over-conservative: scan over all vreg defs and find whether vector
+ // registers are used. If yes, there is a possibility that vector register
+ // will be spilled and thus require dynamic stack realignment.
for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister;
RegNum < RI.getLastVirtReg(); ++RegNum)
- MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment());
-
- FFI->setMaxAlignment(MaxAlign);
+ if (RI.getRegClass(RegNum)->getAlignment() > StackAlignment) {
+ FuncInfo->setReserveFP(true);
+ return true;
+ }
+ // Nothing to do
return false;
}
virtual const char *getPassName() const {
- return "X86 Maximal Stack Alignment Calculator";
+ return "X86 Maximal Stack Alignment Check";
+ }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesCFG();
+ MachineFunctionPass::getAnalysisUsage(AU);
}
};
- char MSAC::ID = 0;
+ char MSAH::ID = 0;
}
FunctionPass*
-llvm::createX86MaxStackAlignmentCalculatorPass() { return new MSAC(); }
+llvm::createX86MaxStackAlignmentHeuristicPass() { return new MSAH(); }
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