//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/DebugInfo.h"
-#include "llvm/Function.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Analysis/ConstantFolding.h"
+#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/MachineConstantPool.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetMachine.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
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());
- if (Fn->hasFnAttr(Attribute::StackAlignment))
- FrameInfo->ensureMaxAlignment(Attribute::getStackAlignmentFromAttrs(
- Fn->getAttributes().getFnAttributes()));
- ConstantPool = new (Allocator) MachineConstantPool(TM.getTargetData());
+ 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);
Alignment = TM.getTargetLowering()->getMinFunctionAlignment();
+
// FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn.
- if (!Fn->hasFnAttr(Attribute::OptimizeForSize))
+ if (!Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::OptimizeForSize))
Alignment = std::max(Alignment,
TM.getTargetLowering()->getPrefFunctionAlignment());
+
FunctionNumber = FunctionNum;
JumpTableInfo = 0;
}
MachineFunction::~MachineFunction() {
- BasicBlocks.clear();
+ // Don't call destructors on MachineInstr and MachineOperand. All of their
+ // memory comes from the BumpPtrAllocator which is about to be purged.
+ //
+ // Do call MachineBasicBlock destructors, it contains std::vectors.
+ for (iterator I = begin(), E = end(); I != E; I = BasicBlocks.erase(I))
+ I->Insts.clearAndLeakNodesUnsafely();
+
InstructionRecycler.clear(Allocator);
+ OperandRecycler.clear(Allocator);
BasicBlockRecycler.clear(Allocator);
if (RegInfo) {
RegInfo->~MachineRegisterInfo();
MachineFunction::CreateMachineInstr(const MCInstrDesc &MCID,
DebugLoc DL, bool NoImp) {
return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
- MachineInstr(MCID, DL, NoImp);
+ MachineInstr(*this, MCID, DL, NoImp);
}
/// CloneMachineInstr - Create a new MachineInstr which is a copy of the
/// DeleteMachineInstr - Delete the given MachineInstr.
///
+/// This function also serves as the MachineInstr destructor - the real
+/// ~MachineInstr() destructor must be empty.
void
MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
- MI->~MachineInstr();
+ // Strip it for parts. The operand array and the MI object itself are
+ // independently recyclable.
+ if (MI->Operands)
+ deallocateOperandArray(MI->CapOperands, MI->Operands);
+ // Don't call ~MachineInstr() which must be trivial anyway because
+ // ~MachineFunction drops whole lists of MachineInstrs wihout calling their
+ // destructors.
InstructionRecycler.Deallocate(Allocator, MI);
}
return std::make_pair(Result, Result + Num);
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MachineFunction::dump() const {
print(dbgs());
}
+#endif
StringRef MachineFunction::getName() const {
assert(getFunction() && "No function!");
}
OS << '\n';
}
- if (RegInfo && !RegInfo->liveout_empty()) {
- OS << "Function Live Outs:";
- for (MachineRegisterInfo::liveout_iterator
- I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I)
- OS << ' ' << PrintReg(*I, TRI);
- OS << '\n';
- }
for (const_iterator BB = begin(), E = end(); BB != E; ++BB) {
OS << '\n';
// 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 (!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 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;
+}
+
+/// CreateStackObject - Create a new statically sized stack object, returning
+/// a nonnegative identifier to represent it.
+///
+int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment,
+ bool isSS, bool MayNeedSP, const AllocaInst *Alloca) {
+ assert(Size != 0 && "Cannot allocate zero size stack objects!");
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP,
+ Alloca));
+ int Index = (int)Objects.size() - NumFixedObjects - 1;
+ assert(Index >= 0 && "Bad frame index!");
+ ensureMaxAlignment(Alignment);
+ return Index;
+}
+
+/// CreateSpillStackObject - Create a new statically sized stack object that
+/// represents a spill slot, returning a nonnegative identifier to represent
+/// it.
+///
+int MachineFrameInfo::CreateSpillStackObject(uint64_t Size,
+ unsigned Alignment) {
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ CreateStackObject(Size, Alignment, true, false);
+ int Index = (int)Objects.size() - NumFixedObjects - 1;
+ ensureMaxAlignment(Alignment);
+ return Index;
+}
+
+/// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
+/// variable sized object has been created. This must be created whenever a
+/// variable sized object is created, whether or not the index returned is
+/// actually used.
+///
+int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment) {
+ HasVarSizedObjects = true;
+ Alignment =
+ clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Alignment, getFrameLowering()->getStackAlignment());
+ Objects.push_back(StackObject(0, Alignment, 0, false, false, true, 0));
+ ensureMaxAlignment(Alignment);
+ return (int)Objects.size()-NumFixedObjects-1;
+}
+
/// CreateFixedObject - Create a new object at a fixed location on the stack.
/// All fixed objects should be created before other objects are created for
/// efficiency. By default, fixed objects are immutable. This returns an
// 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(!getFrameLowering()->isStackRealignable() ||
+ !RealignOption,
+ Align, getFrameLowering()->getStackAlignment());
Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable,
- /*isSS*/false, false));
+ /*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;
}
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MachineFrameInfo::dump(const MachineFunction &MF) const {
print(MF, dbgs());
}
+#endif
//===----------------------------------------------------------------------===//
// MachineJumpTableInfo implementation
//===----------------------------------------------------------------------===//
/// getEntrySize - Return the size of each entry in the jump table.
-unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const {
+unsigned MachineJumpTableInfo::getEntrySize(const DataLayout &TD) const {
// The size of a jump table entry is 4 bytes unless the entry is just the
// address of a block, in which case it is the pointer size.
switch (getEntryKind()) {
}
/// getEntryAlignment - Return the alignment of each entry in the jump table.
-unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
+unsigned MachineJumpTableInfo::getEntryAlignment(const DataLayout &TD) const {
// The alignment of a jump table entry is the alignment of int32 unless the
// entry is just the address of a block, in which case it is the pointer
// alignment.
OS << '\n';
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MachineJumpTableInfo::dump() const { print(dbgs()); }
+#endif
//===----------------------------------------------------------------------===//
void MachineConstantPoolValue::anchor() { }
+const DataLayout *MachineConstantPool::getDataLayout() const {
+ return TM.getDataLayout();
+}
+
Type *MachineConstantPoolEntry::getType() const {
if (isMachineConstantPoolEntry())
return Val.MachineCPVal->getType();
/// CanShareConstantPoolEntry - Test whether the given two constants
/// can be allocated the same constant pool entry.
static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B,
- const TargetData *TD) {
+ const DataLayout *TD) {
// Handle the trivial case quickly.
if (A == B) return true;
// Try constant folding a bitcast of both instructions to an integer. If we
// get two identical ConstantInt's, then we are good to share them. We use
// the constant folding APIs to do this so that we get the benefit of
- // TargetData.
+ // DataLayout.
if (isa<PointerType>(A->getType()))
A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
const_cast<Constant*>(A), TD);
// 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";
}
}
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void MachineConstantPool::dump() const { print(dbgs()); }
+#endif
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