#define DEBUG_TYPE "function-lowering-info"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
+#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/CodeGen/Analysis.h"
-#include "llvm/CodeGen/MachineFunction.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/TargetRegisterInfo.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetFrameInfo.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
#include <algorithm>
using namespace llvm;
if (isa<PHINode>(I)) return true;
const BasicBlock *BB = I->getParent();
for (Value::const_use_iterator UI = I->use_begin(), E = I->use_end();
- UI != E; ++UI)
- if (cast<Instruction>(*UI)->getParent() != BB || isa<PHINode>(*UI))
+ UI != E; ++UI) {
+ const User *U = *UI;
+ if (cast<Instruction>(U)->getParent() != BB || isa<PHINode>(U))
return true;
+ }
return false;
}
-/// isOnlyUsedInEntryBlock - If the specified argument is only used in the
-/// entry block, return true. This includes arguments used by switches, since
-/// the switch may expand into multiple basic blocks.
-static bool isOnlyUsedInEntryBlock(const Argument *A, bool EnableFastISel) {
- // With FastISel active, we may be splitting blocks, so force creation
- // of virtual registers for all non-dead arguments.
- if (EnableFastISel)
- return A->use_empty();
-
- const BasicBlock *Entry = A->getParent()->begin();
- for (Value::const_use_iterator UI = A->use_begin(), E = A->use_end();
- UI != E; ++UI)
- if (cast<Instruction>(*UI)->getParent() != Entry || isa<SwitchInst>(*UI))
- return false; // Use not in entry block.
- return true;
-}
-
FunctionLoweringInfo::FunctionLoweringInfo(const TargetLowering &tli)
: TLI(tli) {
}
MF = &mf;
RegInfo = &MF->getRegInfo();
- // Create a vreg for each argument register that is not dead and is used
- // outside of the entry block for the function.
- for (Function::const_arg_iterator AI = Fn->arg_begin(), E = Fn->arg_end();
- AI != E; ++AI)
- if (!isOnlyUsedInEntryBlock(AI, EnableFastISel))
- InitializeRegForValue(AI);
+ // Check whether the function can return without sret-demotion.
+ SmallVector<ISD::OutputArg, 4> Outs;
+ GetReturnInfo(Fn->getReturnType(), Fn->getAttributes(), Outs, TLI);
+ CanLowerReturn = TLI.CanLowerReturn(Fn->getCallingConv(), *MF,
+ Fn->isVarArg(),
+ Outs, Fn->getContext());
// Initialize the mapping of values to registers. This is only set up for
// instruction values that are used outside of the block that defines
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (const AllocaInst *AI = dyn_cast<AllocaInst>(I))
if (const ConstantInt *CUI = dyn_cast<ConstantInt>(AI->getArraySize())) {
- const Type *Ty = AI->getAllocatedType();
- uint64_t TySize = TLI.getTargetData()->getTypeAllocSize(Ty);
+ Type *Ty = AI->getAllocatedType();
+ uint64_t TySize = TLI.getDataLayout()->getTypeAllocSize(Ty);
unsigned Align =
- std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty),
+ std::max((unsigned)TLI.getDataLayout()->getPrefTypeAlignment(Ty),
AI->getAlignment());
TySize *= CUI->getZExtValue(); // Get total allocated size.
if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
+
+ // The object may need to be placed onto the stack near the stack
+ // protector if one exists. Determine here if this object is a suitable
+ // candidate. I.e., it would trigger the creation of a stack protector.
+ bool MayNeedSP =
+ (AI->isArrayAllocation() ||
+ (TySize >= 8 && isa<ArrayType>(Ty) &&
+ cast<ArrayType>(Ty)->getElementType()->isIntegerTy(8)));
StaticAllocaMap[AI] =
- MF->getFrameInfo()->CreateStackObject(TySize, Align, false);
+ MF->getFrameInfo()->CreateStackObject(TySize, Align, false,
+ MayNeedSP, AI);
}
for (; BB != EB; ++BB)
- for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
+ for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
+ I != E; ++I) {
+ // Mark values used outside their block as exported, by allocating
+ // a virtual register for them.
if (isUsedOutsideOfDefiningBlock(I))
if (!isa<AllocaInst>(I) ||
!StaticAllocaMap.count(cast<AllocaInst>(I)))
InitializeRegForValue(I);
+ // Collect llvm.dbg.declare information. This is done now instead of
+ // during the initial isel pass through the IR so that it is done
+ // in a predictable order.
+ if (const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(I)) {
+ MachineModuleInfo &MMI = MF->getMMI();
+ if (MMI.hasDebugInfo() &&
+ DIVariable(DI->getVariable()).Verify() &&
+ !DI->getDebugLoc().isUnknown()) {
+ // Don't handle byval struct arguments or VLAs, for example.
+ // Non-byval arguments are handled here (they refer to the stack
+ // temporary alloca at this point).
+ const Value *Address = DI->getAddress();
+ if (Address) {
+ if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
+ Address = BCI->getOperand(0);
+ if (const AllocaInst *AI = dyn_cast<AllocaInst>(Address)) {
+ DenseMap<const AllocaInst *, int>::iterator SI =
+ StaticAllocaMap.find(AI);
+ if (SI != StaticAllocaMap.end()) { // Check for VLAs.
+ int FI = SI->second;
+ MMI.setVariableDbgInfo(DI->getVariable(),
+ FI, DI->getDebugLoc());
+ }
+ }
+ }
+ }
+ }
+ }
+
// Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This
// also creates the initial PHI MachineInstrs, though none of the input
// operands are populated.
const PHINode *PN = dyn_cast<PHINode>(I); ++I) {
if (PN->use_empty()) continue;
+ // Skip empty types
+ if (PN->getType()->isEmptyTy())
+ continue;
+
DebugLoc DL = PN->getDebugLoc();
unsigned PHIReg = ValueMap[PN];
assert(PHIReg && "PHI node does not have an assigned virtual register!");
CatchInfoFound.clear();
#endif
LiveOutRegInfo.clear();
+ VisitedBBs.clear();
ArgDbgValues.clear();
+ ByValArgFrameIndexMap.clear();
+ RegFixups.clear();
}
/// CreateReg - Allocate a single virtual register for the given type.
-unsigned FunctionLoweringInfo::CreateReg(EVT VT) {
+unsigned FunctionLoweringInfo::CreateReg(MVT VT) {
return RegInfo->createVirtualRegister(TLI.getRegClassFor(VT));
}
/// In the case that the given value has struct or array type, this function
/// will assign registers for each member or element.
///
-unsigned FunctionLoweringInfo::CreateRegs(const Type *Ty) {
+unsigned FunctionLoweringInfo::CreateRegs(Type *Ty) {
SmallVector<EVT, 4> ValueVTs;
ComputeValueVTs(TLI, Ty, ValueVTs);
unsigned FirstReg = 0;
for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) {
EVT ValueVT = ValueVTs[Value];
- EVT RegisterVT = TLI.getRegisterType(Ty->getContext(), ValueVT);
+ MVT RegisterVT = TLI.getRegisterType(Ty->getContext(), ValueVT);
unsigned NumRegs = TLI.getNumRegisters(Ty->getContext(), ValueVT);
for (unsigned i = 0; i != NumRegs; ++i) {
return FirstReg;
}
+/// GetLiveOutRegInfo - Gets LiveOutInfo for a register, returning NULL if the
+/// register is a PHI destination and the PHI's LiveOutInfo is not valid. If
+/// the register's LiveOutInfo is for a smaller bit width, it is extended to
+/// the larger bit width by zero extension. The bit width must be no smaller
+/// than the LiveOutInfo's existing bit width.
+const FunctionLoweringInfo::LiveOutInfo *
+FunctionLoweringInfo::GetLiveOutRegInfo(unsigned Reg, unsigned BitWidth) {
+ if (!LiveOutRegInfo.inBounds(Reg))
+ return NULL;
+
+ LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
+ if (!LOI->IsValid)
+ return NULL;
+
+ if (BitWidth > LOI->KnownZero.getBitWidth()) {
+ LOI->NumSignBits = 1;
+ LOI->KnownZero = LOI->KnownZero.zextOrTrunc(BitWidth);
+ LOI->KnownOne = LOI->KnownOne.zextOrTrunc(BitWidth);
+ }
+
+ return LOI;
+}
+
+/// ComputePHILiveOutRegInfo - Compute LiveOutInfo for a PHI's destination
+/// register based on the LiveOutInfo of its operands.
+void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
+ Type *Ty = PN->getType();
+ if (!Ty->isIntegerTy() || Ty->isVectorTy())
+ return;
+
+ SmallVector<EVT, 1> ValueVTs;
+ ComputeValueVTs(TLI, Ty, ValueVTs);
+ assert(ValueVTs.size() == 1 &&
+ "PHIs with non-vector integer types should have a single VT.");
+ EVT IntVT = ValueVTs[0];
+
+ if (TLI.getNumRegisters(PN->getContext(), IntVT) != 1)
+ return;
+ IntVT = TLI.getTypeToTransformTo(PN->getContext(), IntVT);
+ unsigned BitWidth = IntVT.getSizeInBits();
+
+ unsigned DestReg = ValueMap[PN];
+ if (!TargetRegisterInfo::isVirtualRegister(DestReg))
+ return;
+ LiveOutRegInfo.grow(DestReg);
+ LiveOutInfo &DestLOI = LiveOutRegInfo[DestReg];
+
+ Value *V = PN->getIncomingValue(0);
+ if (isa<UndefValue>(V) || isa<ConstantExpr>(V)) {
+ DestLOI.NumSignBits = 1;
+ APInt Zero(BitWidth, 0);
+ DestLOI.KnownZero = Zero;
+ DestLOI.KnownOne = Zero;
+ return;
+ }
+
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ APInt Val = CI->getValue().zextOrTrunc(BitWidth);
+ DestLOI.NumSignBits = Val.getNumSignBits();
+ DestLOI.KnownZero = ~Val;
+ DestLOI.KnownOne = Val;
+ } else {
+ assert(ValueMap.count(V) && "V should have been placed in ValueMap when its"
+ "CopyToReg node was created.");
+ unsigned SrcReg = ValueMap[V];
+ if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) {
+ DestLOI.IsValid = false;
+ return;
+ }
+ const LiveOutInfo *SrcLOI = GetLiveOutRegInfo(SrcReg, BitWidth);
+ if (!SrcLOI) {
+ DestLOI.IsValid = false;
+ return;
+ }
+ DestLOI = *SrcLOI;
+ }
+
+ assert(DestLOI.KnownZero.getBitWidth() == BitWidth &&
+ DestLOI.KnownOne.getBitWidth() == BitWidth &&
+ "Masks should have the same bit width as the type.");
+
+ for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i) {
+ Value *V = PN->getIncomingValue(i);
+ if (isa<UndefValue>(V) || isa<ConstantExpr>(V)) {
+ DestLOI.NumSignBits = 1;
+ APInt Zero(BitWidth, 0);
+ DestLOI.KnownZero = Zero;
+ DestLOI.KnownOne = Zero;
+ return;
+ }
+
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ APInt Val = CI->getValue().zextOrTrunc(BitWidth);
+ DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, Val.getNumSignBits());
+ DestLOI.KnownZero &= ~Val;
+ DestLOI.KnownOne &= Val;
+ continue;
+ }
+
+ assert(ValueMap.count(V) && "V should have been placed in ValueMap when "
+ "its CopyToReg node was created.");
+ unsigned SrcReg = ValueMap[V];
+ if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) {
+ DestLOI.IsValid = false;
+ return;
+ }
+ const LiveOutInfo *SrcLOI = GetLiveOutRegInfo(SrcReg, BitWidth);
+ if (!SrcLOI) {
+ DestLOI.IsValid = false;
+ return;
+ }
+ DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, SrcLOI->NumSignBits);
+ DestLOI.KnownZero &= SrcLOI->KnownZero;
+ DestLOI.KnownOne &= SrcLOI->KnownOne;
+ }
+}
+
+/// setArgumentFrameIndex - Record frame index for the byval
+/// argument. This overrides previous frame index entry for this argument,
+/// if any.
+void FunctionLoweringInfo::setArgumentFrameIndex(const Argument *A,
+ int FI) {
+ ByValArgFrameIndexMap[A] = FI;
+}
+
+/// getArgumentFrameIndex - Get frame index for the byval argument.
+/// If the argument does not have any assigned frame index then 0 is
+/// returned.
+int FunctionLoweringInfo::getArgumentFrameIndex(const Argument *A) {
+ DenseMap<const Argument *, int>::iterator I =
+ ByValArgFrameIndexMap.find(A);
+ if (I != ByValArgFrameIndexMap.end())
+ return I->second;
+ DEBUG(dbgs() << "Argument does not have assigned frame index!\n");
+ return 0;
+}
+
+/// ComputeUsesVAFloatArgument - Determine if any floating-point values are
+/// being passed to this variadic function, and set the MachineModuleInfo's
+/// usesVAFloatArgument flag if so. This flag is used to emit an undefined
+/// reference to _fltused on Windows, which will link in MSVCRT's
+/// floating-point support.
+void llvm::ComputeUsesVAFloatArgument(const CallInst &I,
+ MachineModuleInfo *MMI)
+{
+ FunctionType *FT = cast<FunctionType>(
+ I.getCalledValue()->getType()->getContainedType(0));
+ if (FT->isVarArg() && !MMI->usesVAFloatArgument()) {
+ for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
+ Type* T = I.getArgOperand(i)->getType();
+ for (po_iterator<Type*> i = po_begin(T), e = po_end(T);
+ i != e; ++i) {
+ if (i->isFloatingPointTy()) {
+ MMI->setUsesVAFloatArgument(true);
+ return;
+ }
+ }
+ }
+ }
+}
+
/// AddCatchInfo - Extract the personality and type infos from an eh.selector
/// call, and add them to the specified machine basic block.
void llvm::AddCatchInfo(const CallInst &I, MachineModuleInfo *MMI,
}
}
-void llvm::CopyCatchInfo(const BasicBlock *SrcBB, const BasicBlock *DestBB,
- MachineModuleInfo *MMI, FunctionLoweringInfo &FLI) {
- for (BasicBlock::const_iterator I = SrcBB->begin(), E = --SrcBB->end();
- I != E; ++I)
- if (const EHSelectorInst *EHSel = dyn_cast<EHSelectorInst>(I)) {
- // Apply the catch info to DestBB.
- AddCatchInfo(*EHSel, MMI, FLI.MBBMap[DestBB]);
-#ifndef NDEBUG
- if (!FLI.MBBMap[SrcBB]->isLandingPad())
- FLI.CatchInfoFound.insert(EHSel);
-#endif
+/// AddLandingPadInfo - Extract the exception handling information from the
+/// landingpad instruction and add them to the specified machine module info.
+void llvm::AddLandingPadInfo(const LandingPadInst &I, MachineModuleInfo &MMI,
+ MachineBasicBlock *MBB) {
+ MMI.addPersonality(MBB,
+ cast<Function>(I.getPersonalityFn()->stripPointerCasts()));
+
+ if (I.isCleanup())
+ MMI.addCleanup(MBB);
+
+ // FIXME: New EH - Add the clauses in reverse order. This isn't 100% correct,
+ // but we need to do it this way because of how the DWARF EH emitter
+ // processes the clauses.
+ for (unsigned i = I.getNumClauses(); i != 0; --i) {
+ Value *Val = I.getClause(i - 1);
+ if (I.isCatch(i - 1)) {
+ MMI.addCatchTypeInfo(MBB,
+ dyn_cast<GlobalVariable>(Val->stripPointerCasts()));
+ } else {
+ // Add filters in a list.
+ Constant *CVal = cast<Constant>(Val);
+ SmallVector<const GlobalVariable*, 4> FilterList;
+ for (User::op_iterator
+ II = CVal->op_begin(), IE = CVal->op_end(); II != IE; ++II)
+ FilterList.push_back(cast<GlobalVariable>((*II)->stripPointerCasts()));
+
+ MMI.addFilterTypeInfo(MBB, FilterList);
}
+ }
}