#include "llvm/DebugInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
+#include "llvm/IR/Writer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/Debug.h"
GCModuleInfo* gmi)
: Fn(F), Target(TM), Ctx(mmi.getContext()), MMI(mmi), GMI(gmi) {
if (TM.getRegisterInfo())
- RegInfo = new (Allocator) MachineRegisterInfo(*TM.getRegisterInfo());
+ RegInfo = new (Allocator) MachineRegisterInfo(TM);
else
RegInfo = 0;
+
MFInfo = 0;
- FrameInfo = new (Allocator) MachineFrameInfo(*TM.getFrameLowering(),
- TM.Options.RealignStack);
+ FrameInfo =
+ new (Allocator) MachineFrameInfo(TM,!F->hasFnAttribute("no-realign-stack"));
+
if (Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
Attribute::StackAlignment))
FrameInfo->ensureMaxAlignment(Fn->getAttributes().
getStackAlignment(AttributeSet::FunctionIndex));
- ConstantPool = new (Allocator) MachineConstantPool(TM.getDataLayout());
+
+ ConstantPool = new (Allocator) MachineConstantPool(TM);
Alignment = TM.getTargetLowering()->getMinFunctionAlignment();
+
// FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn.
if (!Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
Attribute::OptimizeForSize))
Alignment = std::max(Alignment,
TM.getTargetLowering()->getPrefFunctionAlignment());
+
FunctionNumber = FunctionNum;
JumpTableInfo = 0;
}
MachineRegisterInfo &MRI = getRegInfo();
unsigned VReg = MRI.getLiveInVirtReg(PReg);
if (VReg) {
- assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!");
+ const TargetRegisterClass *VRegRC = MRI.getRegClass(VReg);
+ (void)VRegRC;
+ // A physical register can be added several times.
+ // Between two calls, the register class of the related virtual register
+ // may have been constrained to match some operation constraints.
+ // In that case, check that the current register class includes the
+ // physical register and is a sub class of the specified RC.
+ assert((VRegRC == RC || (VRegRC->contains(PReg) &&
+ RC->hasSubClassEq(VRegRC))) &&
+ "Register class mismatch!");
return VReg;
}
VReg = MRI.createVirtualRegister(RC);
/// normal 'L' label is returned.
MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
bool isLinkerPrivate) const {
+ const DataLayout *DL = getTarget().getDataLayout();
assert(JumpTableInfo && "No jump tables");
assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
- const MCAsmInfo &MAI = *getTarget().getMCAsmInfo();
- const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() :
- MAI.getPrivateGlobalPrefix();
+ const char *Prefix = isLinkerPrivate ? DL->getLinkerPrivateGlobalPrefix() :
+ DL->getPrivateGlobalPrefix();
SmallString<60> Name;
raw_svector_ostream(Name)
<< Prefix << "JTI" << getFunctionNumber() << '_' << JTI;
/// getPICBaseSymbol - Return a function-local symbol to represent the PIC
/// base.
MCSymbol *MachineFunction::getPICBaseSymbol() const {
- const MCAsmInfo &MAI = *Target.getMCAsmInfo();
- return Ctx.GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix())+
+ const DataLayout *DL = getTarget().getDataLayout();
+ return Ctx.GetOrCreateSymbol(Twine(DL->getPrivateGlobalPrefix())+
Twine(getFunctionNumber())+"$pb");
}
// MachineFrameInfo implementation
//===----------------------------------------------------------------------===//
+const TargetFrameLowering *MachineFrameInfo::getFrameLowering() const {
+ return TM.getFrameLowering();
+}
+
/// ensureMaxAlignment - Make sure the function is at least Align bytes
/// aligned.
void MachineFrameInfo::ensureMaxAlignment(unsigned Align) {
- if (!TFI.isStackRealignable() || !RealignOption)
- assert(Align <= TFI.getStackAlignment() &&
+ if (!getFrameLowering()->isStackRealignable() || !RealignOption)
+ assert(Align <= getFrameLowering()->getStackAlignment() &&
"For targets without stack realignment, Align is out of limit!");
if (MaxAlignment < Align) MaxAlignment = Align;
}
/// clampStackAlignment - Clamp the alignment if requested and emit a warning.
-static inline unsigned clampStackAlignment(bool ShouldClamp, unsigned PrefAlign,
- unsigned MinAlign, unsigned StackAlign,
- const AllocaInst *Alloca = 0) {
- if (!ShouldClamp || PrefAlign <= StackAlign)
- return PrefAlign;
- if (Alloca && MinAlign > StackAlign)
- Alloca->getParent()->getContext().emitWarning(Alloca,
- "Requested alignment exceeds the stack alignment!");
- else
- assert(MinAlign <= StackAlign &&
- "Requested alignment exceeds the stack alignment!");
+static inline unsigned clampStackAlignment(bool ShouldClamp, unsigned Align,
+ unsigned StackAlign) {
+ if (!ShouldClamp || Align <= StackAlign)
+ return Align;
+ DEBUG(dbgs() << "Warning: requested alignment " << Align
+ << " exceeds the stack alignment " << StackAlign
+ << " when stack realignment is off" << '\n');
return StackAlign;
}
-/// CreateStackObjectWithMinAlign - Create a new statically sized stack
-/// object, returning a nonnegative identifier to represent it. This function
-/// takes a preferred alignment and a minimal alignment.
+/// CreateStackObject - Create a new statically sized stack object, returning
+/// a nonnegative identifier to represent it.
///
-int MachineFrameInfo::CreateStackObjectWithMinAlign(uint64_t Size,
- unsigned PrefAlignment, unsigned MinAlignment,
- bool isSS, bool MayNeedSP, const AllocaInst *Alloca) {
+int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment,
+ bool isSS, const AllocaInst *Alloca) {
assert(Size != 0 && "Cannot allocate zero size stack objects!");
- unsigned Alignment = clampStackAlignment(
- !TFI.isStackRealignable() || !RealignOption,
- PrefAlignment, MinAlignment,
- TFI.getStackAlignment(), Alloca);
- Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP,
- Alloca));
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, Alloca));
int Index = (int)Objects.size() - NumFixedObjects - 1;
assert(Index >= 0 && "Bad frame index!");
ensureMaxAlignment(Alignment);
///
int MachineFrameInfo::CreateSpillStackObject(uint64_t Size,
unsigned Alignment) {
- Alignment = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
- Alignment, 0,
- TFI.getStackAlignment());
- CreateStackObject(Size, Alignment, true, false);
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ CreateStackObject(Size, Alignment, true);
int Index = (int)Objects.size() - NumFixedObjects - 1;
ensureMaxAlignment(Alignment);
return Index;
/// variable sized object is created, whether or not the index returned is
/// actually used.
///
-int MachineFrameInfo::CreateVariableSizedObject(unsigned PrefAlignment,
- unsigned MinAlignment, const AllocaInst *Alloca) {
+int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment,
+ const AllocaInst *Alloca) {
HasVarSizedObjects = true;
- unsigned Alignment = clampStackAlignment(
- !TFI.isStackRealignable() || !RealignOption,
- PrefAlignment, MinAlignment,
- TFI.getStackAlignment(), Alloca);
- Objects.push_back(StackObject(0, Alignment, 0, false, false, true, 0));
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ Objects.push_back(StackObject(0, Alignment, 0, false, false, Alloca));
ensureMaxAlignment(Alignment);
return (int)Objects.size()-NumFixedObjects-1;
}
// the incoming frame position. If the frame object is at offset 32 and
// the stack is guaranteed to be 16-byte aligned, then we know that the
// object is 16-byte aligned.
- unsigned StackAlign = TFI.getStackAlignment();
+ unsigned StackAlign = getFrameLowering()->getStackAlignment();
unsigned Align = MinAlign(SPOffset, StackAlign);
- Align = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
- Align, 0, TFI.getStackAlignment());
+ Align =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Align, getFrameLowering()->getStackAlignment());
Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable,
/*isSS*/ false,
- /*NeedSP*/ false,
/*Alloca*/ 0));
return -++NumFixedObjects;
}
return BV;
}
+unsigned MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
+ const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetRegisterInfo *RegInfo = MF.getTarget().getRegisterInfo();
+ unsigned MaxAlign = getMaxAlignment();
+ int Offset = 0;
+
+ // This code is very, very similar to PEI::calculateFrameObjectOffsets().
+ // It really should be refactored to share code. Until then, changes
+ // should keep in mind that there's tight coupling between the two.
+
+ for (int i = getObjectIndexBegin(); i != 0; ++i) {
+ int FixedOff = -getObjectOffset(i);
+ if (FixedOff > Offset) Offset = FixedOff;
+ }
+ for (unsigned i = 0, e = getObjectIndexEnd(); i != e; ++i) {
+ if (isDeadObjectIndex(i))
+ continue;
+ Offset += getObjectSize(i);
+ unsigned Align = getObjectAlignment(i);
+ // Adjust to alignment boundary
+ Offset = (Offset+Align-1)/Align*Align;
+
+ MaxAlign = std::max(Align, MaxAlign);
+ }
+
+ if (adjustsStack() && TFI->hasReservedCallFrame(MF))
+ Offset += getMaxCallFrameSize();
+
+ // Round up the size to a multiple of the alignment. If the function has
+ // any calls or alloca's, align to the target's StackAlignment value to
+ // ensure that the callee's frame or the alloca data is suitably aligned;
+ // otherwise, for leaf functions, align to the TransientStackAlignment
+ // value.
+ unsigned StackAlign;
+ if (adjustsStack() || hasVarSizedObjects() ||
+ (RegInfo->needsStackRealignment(MF) && getObjectIndexEnd() != 0))
+ StackAlign = TFI->getStackAlignment();
+ else
+ StackAlign = TFI->getTransientStackAlignment();
+
+ // If the frame pointer is eliminated, all frame offsets will be relative to
+ // SP not FP. Align to MaxAlign so this works.
+ StackAlign = std::max(StackAlign, MaxAlign);
+ unsigned AlignMask = StackAlign - 1;
+ Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
+
+ return (unsigned)Offset;
+}
void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
if (Objects.empty()) return;
void MachineConstantPoolValue::anchor() { }
+const DataLayout *MachineConstantPool::getDataLayout() const {
+ return TM.getDataLayout();
+}
+
Type *MachineConstantPoolEntry::getType() const {
if (isMachineConstantPoolEntry())
return Val.MachineCPVal->getType();
// FIXME, this could be made much more efficient for large constant pools.
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
if (!Constants[i].isMachineConstantPoolEntry() &&
- CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) {
+ CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C,
+ getDataLayout())) {
if ((unsigned)Constants[i].getAlignment() < Alignment)
Constants[i].Alignment = Alignment;
return i;
if (Constants[i].isMachineConstantPoolEntry())
Constants[i].Val.MachineCPVal->print(OS);
else
- OS << *(const Value*)Constants[i].Val.ConstVal;
+ WriteAsOperand(OS, Constants[i].Val.ConstVal, /*PrintType=*/false);
OS << ", align=" << Constants[i].getAlignment();
OS << "\n";
}
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