//
//===----------------------------------------------------------------------===//
-#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/Analysis/DebugInfo.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/TargetInstrInfo.h"
-#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/CodeGen/WinEHFuncInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DebugInfo.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/Support/raw_ostream.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
#include <algorithm>
using namespace llvm;
+#define DEBUG_TYPE "function-lowering-info"
+
/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by
/// PHI nodes or outside of the basic block that defines it, or used by a
/// switch or atomic instruction, which may expand to multiple basic blocks.
if (I->use_empty()) return false;
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) {
- const User *U = *UI;
+ for (const User *U : I->users())
if (cast<Instruction>(U)->getParent() != BB || isa<PHINode>(U))
return true;
- }
+
return false;
}
-FunctionLoweringInfo::FunctionLoweringInfo(const TargetLowering &tli)
- : TLI(tli) {
+static ISD::NodeType getPreferredExtendForValue(const Value *V) {
+ // For the users of the source value being used for compare instruction, if
+ // the number of signed predicate is greater than unsigned predicate, we
+ // prefer to use SIGN_EXTEND.
+ //
+ // With this optimization, we would be able to reduce some redundant sign or
+ // zero extension instruction, and eventually more machine CSE opportunities
+ // can be exposed.
+ ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
+ unsigned NumOfSigned = 0, NumOfUnsigned = 0;
+ for (const User *U : V->users()) {
+ if (const auto *CI = dyn_cast<CmpInst>(U)) {
+ NumOfSigned += CI->isSigned();
+ NumOfUnsigned += CI->isUnsigned();
+ }
+ }
+ if (NumOfSigned > NumOfUnsigned)
+ ExtendKind = ISD::SIGN_EXTEND;
+
+ return ExtendKind;
}
-void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf) {
+void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
+ SelectionDAG *DAG) {
Fn = &fn;
MF = &mf;
+ TLI = MF->getSubtarget().getTargetLowering();
RegInfo = &MF->getRegInfo();
+ MachineModuleInfo &MMI = MF->getMMI();
// Check whether the function can return without sret-demotion.
SmallVector<ISD::OutputArg, 4> Outs;
- GetReturnInfo(Fn->getReturnType(),
- Fn->getAttributes().getRetAttributes(), Outs, TLI);
- CanLowerReturn = TLI.CanLowerReturn(Fn->getCallingConv(), *MF,
- Fn->isVarArg(),
- Outs, Fn->getContext());
+ GetReturnInfo(Fn->getReturnType(), Fn->getAttributes(), Outs, *TLI,
+ mf.getDataLayout());
+ 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
// them.
Function::const_iterator BB = Fn->begin(), EB = Fn->end();
- 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);
- unsigned Align =
- std::max((unsigned)TLI.getTargetData()->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, MayNeedSP);
+ for (; BB != EB; ++BB)
+ for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
+ I != E; ++I) {
+ if (const AllocaInst *AI = dyn_cast<AllocaInst>(I)) {
+ // Static allocas can be folded into the initial stack frame adjustment.
+ if (AI->isStaticAlloca()) {
+ const ConstantInt *CUI = cast<ConstantInt>(AI->getArraySize());
+ Type *Ty = AI->getAllocatedType();
+ uint64_t TySize = MF->getDataLayout().getTypeAllocSize(Ty);
+ unsigned Align =
+ std::max((unsigned)MF->getDataLayout().getPrefTypeAlignment(Ty),
+ AI->getAlignment());
+
+ TySize *= CUI->getZExtValue(); // Get total allocated size.
+ if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
+
+ StaticAllocaMap[AI] =
+ MF->getFrameInfo()->CreateStackObject(TySize, Align, false, AI);
+
+ } else {
+ unsigned Align =
+ std::max((unsigned)MF->getDataLayout().getPrefTypeAlignment(
+ AI->getAllocatedType()),
+ AI->getAlignment());
+ unsigned StackAlign =
+ MF->getSubtarget().getFrameLowering()->getStackAlignment();
+ if (Align <= StackAlign)
+ Align = 0;
+ // Inform the Frame Information that we have variable-sized objects.
+ MF->getFrameInfo()->CreateVariableSizedObject(Align ? Align : 1, AI);
+ }
+ }
+
+ // Look for inline asm that clobbers the SP register.
+ if (isa<CallInst>(I) || isa<InvokeInst>(I)) {
+ ImmutableCallSite CS(I);
+ if (isa<InlineAsm>(CS.getCalledValue())) {
+ unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
+ const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
+ std::vector<TargetLowering::AsmOperandInfo> Ops =
+ TLI->ParseConstraints(Fn->getParent()->getDataLayout(), TRI, CS);
+ for (size_t I = 0, E = Ops.size(); I != E; ++I) {
+ TargetLowering::AsmOperandInfo &Op = Ops[I];
+ if (Op.Type == InlineAsm::isClobber) {
+ // Clobbers don't have SDValue operands, hence SDValue().
+ TLI->ComputeConstraintToUse(Op, SDValue(), DAG);
+ std::pair<unsigned, const TargetRegisterClass *> PhysReg =
+ TLI->getRegForInlineAsmConstraint(TRI, Op.ConstraintCode,
+ Op.ConstraintVT);
+ if (PhysReg.first == SP)
+ MF->getFrameInfo()->setHasOpaqueSPAdjustment(true);
+ }
+ }
+ }
+ }
+
+ // Look for calls to the @llvm.va_start intrinsic. We can omit some
+ // prologue boilerplate for variadic functions that don't examine their
+ // arguments.
+ if (const auto *II = dyn_cast<IntrinsicInst>(I)) {
+ if (II->getIntrinsicID() == Intrinsic::vastart)
+ MF->getFrameInfo()->setHasVAStart(true);
+ }
+
+ // If we have a musttail call in a variadic funciton, we need to ensure we
+ // forward implicit register parameters.
+ if (const auto *CI = dyn_cast<CallInst>(I)) {
+ if (CI->isMustTailCall() && Fn->isVarArg())
+ MF->getFrameInfo()->setHasMustTailInVarArgFunc(true);
}
- for (; BB != EB; ++BB)
- 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))
// 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()) {
+ assert(DI->getVariable() && "Missing variable");
+ assert(DI->getDebugLoc() && "Missing location");
+ if (MMI.hasDebugInfo()) {
// 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).
StaticAllocaMap.find(AI);
if (SI != StaticAllocaMap.end()) { // Check for VLAs.
int FI = SI->second;
- MMI.setVariableDbgInfo(DI->getVariable(),
+ MMI.setVariableDbgInfo(DI->getVariable(), DI->getExpression(),
FI, DI->getDebugLoc());
}
}
}
}
}
+
+ // Decide the preferred extend type for a value.
+ PreferredExtendType[I] = getPreferredExtendForValue(I);
}
// 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.
for (BB = Fn->begin(); BB != EB; ++BB) {
+ // Don't create MachineBasicBlocks for imaginary EH pad blocks. These blocks
+ // are really data, and no instructions can live here.
+ if (BB->isEHPad()) {
+ const Instruction *I = BB->getFirstNonPHI();
+ if (!isa<LandingPadInst>(I))
+ MMI.setHasEHFunclets(true);
+ if (isa<CatchPadInst>(I) || isa<CatchEndPadInst>(I) ||
+ isa<CleanupEndPadInst>(I)) {
+ assert(&*BB->begin() == I &&
+ "WinEHPrepare failed to remove PHIs from imaginary BBs");
+ continue;
+ }
+ }
+
MachineBasicBlock *MBB = mf.CreateMachineBasicBlock(BB);
MBBMap[BB] = MBB;
MF->push_back(MBB);
assert(PHIReg && "PHI node does not have an assigned virtual register!");
SmallVector<EVT, 4> ValueVTs;
- ComputeValueVTs(TLI, PN->getType(), ValueVTs);
+ ComputeValueVTs(*TLI, MF->getDataLayout(), PN->getType(), ValueVTs);
for (unsigned vti = 0, vte = ValueVTs.size(); vti != vte; ++vti) {
EVT VT = ValueVTs[vti];
- unsigned NumRegisters = TLI.getNumRegisters(Fn->getContext(), VT);
- const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
+ unsigned NumRegisters = TLI->getNumRegisters(Fn->getContext(), VT);
+ const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
for (unsigned i = 0; i != NumRegisters; ++i)
BuildMI(MBB, DL, TII->get(TargetOpcode::PHI), PHIReg + i);
PHIReg += NumRegisters;
}
// Mark landing pad blocks.
- for (BB = Fn->begin(); BB != EB; ++BB)
- if (const InvokeInst *Invoke = dyn_cast<InvokeInst>(BB->getTerminator()))
- MBBMap[Invoke->getSuccessor(1)]->setIsLandingPad();
+ SmallVector<const LandingPadInst *, 4> LPads;
+ for (BB = Fn->begin(); BB != EB; ++BB) {
+ const Instruction *FNP = BB->getFirstNonPHI();
+ if (BB->isEHPad() && MBBMap.count(BB))
+ MBBMap[BB]->setIsEHPad();
+ if (const auto *LPI = dyn_cast<LandingPadInst>(FNP))
+ LPads.push_back(LPI);
+ }
+
+ // If this personality uses funclets, we need to do a bit more work.
+ if (!Fn->hasPersonalityFn())
+ return;
+ EHPersonality Personality = classifyEHPersonality(Fn->getPersonalityFn());
+ if (!isFuncletEHPersonality(Personality))
+ return;
+
+ if (Personality == EHPersonality::MSVC_Win64SEH ||
+ Personality == EHPersonality::MSVC_X86SEH) {
+ addSEHHandlersForLPads(LPads);
+ }
+
+ // Calculate state numbers if we haven't already.
+ WinEHFuncInfo &EHInfo = MMI.getWinEHFuncInfo(&fn);
+ const Function *WinEHParentFn = MMI.getWinEHParent(&fn);
+ if (Personality == EHPersonality::MSVC_CXX)
+ calculateWinCXXEHStateNumbers(WinEHParentFn, EHInfo);
+ else if (isAsynchronousEHPersonality(Personality))
+ calculateSEHStateNumbers(WinEHParentFn, EHInfo);
+ else if (Personality == EHPersonality::CoreCLR)
+ calculateClrEHStateNumbers(WinEHParentFn, EHInfo);
+
+ calculateCatchReturnSuccessorColors(WinEHParentFn, EHInfo);
+
+ // Map all BB references in the WinEH data to MBBs.
+ for (WinEHTryBlockMapEntry &TBME : EHInfo.TryBlockMap) {
+ for (WinEHHandlerType &H : TBME.HandlerArray) {
+ if (H.CatchObjRecoverIdx == -2 && H.CatchObj.Alloca) {
+ assert(StaticAllocaMap.count(H.CatchObj.Alloca));
+ H.CatchObj.FrameIndex = StaticAllocaMap[H.CatchObj.Alloca];
+ } else {
+ H.CatchObj.FrameIndex = INT_MAX;
+ }
+ if (const auto *BB = dyn_cast<BasicBlock>(H.Handler.get<const Value *>()))
+ H.Handler = MBBMap[BB];
+ }
+ }
+ for (WinEHUnwindMapEntry &UME : EHInfo.UnwindMap)
+ if (UME.Cleanup)
+ if (const auto *BB = dyn_cast<BasicBlock>(UME.Cleanup.get<const Value *>()))
+ UME.Cleanup = MBBMap[BB];
+ for (SEHUnwindMapEntry &UME : EHInfo.SEHUnwindMap) {
+ const BasicBlock *BB = UME.Handler.get<const BasicBlock *>();
+ UME.Handler = MBBMap[BB];
+ }
+ for (ClrEHUnwindMapEntry &CME : EHInfo.ClrEHUnwindMap) {
+ const BasicBlock *BB = CME.Handler.get<const BasicBlock *>();
+ CME.Handler = MBBMap[BB];
+ }
+
+ // If there's an explicit EH registration node on the stack, record its
+ // frame index.
+ if (EHInfo.EHRegNode && EHInfo.EHRegNode->getParent()->getParent() == Fn) {
+ assert(StaticAllocaMap.count(EHInfo.EHRegNode));
+ EHInfo.EHRegNodeFrameIndex = StaticAllocaMap[EHInfo.EHRegNode];
+ }
+
+ // Copy the state numbers to LandingPadInfo for the current function, which
+ // could be a handler or the parent. This should happen for 32-bit SEH and
+ // C++ EH.
+ if (Personality == EHPersonality::MSVC_CXX ||
+ Personality == EHPersonality::MSVC_X86SEH) {
+ for (const LandingPadInst *LP : LPads) {
+ MachineBasicBlock *LPadMBB = MBBMap[LP->getParent()];
+ MMI.addWinEHState(LPadMBB, EHInfo.EHPadStateMap[LP]);
+ }
+ }
+}
+
+void FunctionLoweringInfo::addSEHHandlersForLPads(
+ ArrayRef<const LandingPadInst *> LPads) {
+ MachineModuleInfo &MMI = MF->getMMI();
+
+ // Iterate over all landing pads with llvm.eh.actions calls.
+ for (const LandingPadInst *LP : LPads) {
+ const IntrinsicInst *ActionsCall =
+ dyn_cast<IntrinsicInst>(LP->getNextNode());
+ if (!ActionsCall ||
+ ActionsCall->getIntrinsicID() != Intrinsic::eh_actions)
+ continue;
+
+ // Parse the llvm.eh.actions call we found.
+ MachineBasicBlock *LPadMBB = MBBMap[LP->getParent()];
+ SmallVector<std::unique_ptr<ActionHandler>, 4> Actions;
+ parseEHActions(ActionsCall, Actions);
+
+ // Iterate EH actions from most to least precedence, which means
+ // iterating in reverse.
+ for (auto I = Actions.rbegin(), E = Actions.rend(); I != E; ++I) {
+ ActionHandler *Action = I->get();
+ if (auto *CH = dyn_cast<CatchHandler>(Action)) {
+ const auto *Filter =
+ dyn_cast<Function>(CH->getSelector()->stripPointerCasts());
+ assert((Filter || CH->getSelector()->isNullValue()) &&
+ "expected function or catch-all");
+ const auto *RecoverBA =
+ cast<BlockAddress>(CH->getHandlerBlockOrFunc());
+ MMI.addSEHCatchHandler(LPadMBB, Filter, RecoverBA);
+ } else {
+ assert(isa<CleanupHandler>(Action));
+ const auto *Fini = cast<Function>(Action->getHandlerBlockOrFunc());
+ MMI.addSEHCleanupHandler(LPadMBB, Fini);
+ }
+ }
+ }
}
/// clear - Clear out all the function-specific state. This returns this
ArgDbgValues.clear();
ByValArgFrameIndexMap.clear();
RegFixups.clear();
+ StatepointStackSlots.clear();
+ StatepointRelocatedValues.clear();
+ PreferredExtendType.clear();
}
/// CreateReg - Allocate a single virtual register for the given type.
-unsigned FunctionLoweringInfo::CreateReg(EVT VT) {
- return RegInfo->createVirtualRegister(TLI.getRegClassFor(VT));
+unsigned FunctionLoweringInfo::CreateReg(MVT VT) {
+ return RegInfo->createVirtualRegister(
+ MF->getSubtarget().getTargetLowering()->getRegClassFor(VT));
}
/// CreateRegs - Allocate the appropriate number of virtual registers of
/// 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) {
+ const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
+
SmallVector<EVT, 4> ValueVTs;
- ComputeValueVTs(TLI, Ty, ValueVTs);
+ ComputeValueVTs(*TLI, MF->getDataLayout(), 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);
+ unsigned NumRegs = TLI->getNumRegisters(Ty->getContext(), ValueVT);
for (unsigned i = 0; i != NumRegs; ++i) {
unsigned R = CreateReg(RegisterVT);
if (!FirstReg) FirstReg = R;
const FunctionLoweringInfo::LiveOutInfo *
FunctionLoweringInfo::GetLiveOutRegInfo(unsigned Reg, unsigned BitWidth) {
if (!LiveOutRegInfo.inBounds(Reg))
- return NULL;
+ return nullptr;
LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
if (!LOI->IsValid)
- return NULL;
+ return nullptr;
if (BitWidth > LOI->KnownZero.getBitWidth()) {
LOI->NumSignBits = 1;
/// ComputePHILiveOutRegInfo - Compute LiveOutInfo for a PHI's destination
/// register based on the LiveOutInfo of its operands.
void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
- const Type *Ty = PN->getType();
+ Type *Ty = PN->getType();
if (!Ty->isIntegerTy() || Ty->isVectorTy())
return;
SmallVector<EVT, 1> ValueVTs;
- ComputeValueVTs(TLI, Ty, ValueVTs);
+ ComputeValueVTs(*TLI, MF->getDataLayout(), 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)
+ if (TLI->getNumRegisters(PN->getContext(), IntVT) != 1)
return;
- IntVT = TLI.getTypeToTransformTo(PN->getContext(), IntVT);
+ IntVT = TLI->getTypeToTransformTo(PN->getContext(), IntVT);
unsigned BitWidth = IntVT.getSizeInBits();
unsigned DestReg = ValueMap[PN];
}
}
-/// setByValArgumentFrameIndex - Record frame index for the byval
+/// setArgumentFrameIndex - Record frame index for the byval
/// argument. This overrides previous frame index entry for this argument,
/// if any.
-void FunctionLoweringInfo::setByValArgumentFrameIndex(const Argument *A,
- int FI) {
- assert (A->hasByValAttr() && "Argument does not have byval attribute!");
+void FunctionLoweringInfo::setArgumentFrameIndex(const Argument *A,
+ int FI) {
ByValArgFrameIndexMap[A] = FI;
}
-/// getByValArgumentFrameIndex - Get frame index for the byval argument.
+/// getArgumentFrameIndex - Get frame index for the byval argument.
/// If the argument does not have any assigned frame index then 0 is
/// returned.
-int FunctionLoweringInfo::getByValArgumentFrameIndex(const Argument *A) {
- assert (A->hasByValAttr() && "Argument does not have byval attribute!");
+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!");
+ DEBUG(dbgs() << "Argument does not have assigned frame index!\n");
return 0;
}
-/// 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,
- MachineBasicBlock *MBB) {
- // Inform the MachineModuleInfo of the personality for this landing pad.
- const ConstantExpr *CE = cast<ConstantExpr>(I.getArgOperand(1));
- assert(CE->getOpcode() == Instruction::BitCast &&
- isa<Function>(CE->getOperand(0)) &&
- "Personality should be a function");
- MMI->addPersonality(MBB, cast<Function>(CE->getOperand(0)));
-
- // Gather all the type infos for this landing pad and pass them along to
- // MachineModuleInfo.
- std::vector<const GlobalVariable *> TyInfo;
- unsigned N = I.getNumArgOperands();
-
- for (unsigned i = N - 1; i > 1; --i) {
- if (const ConstantInt *CI = dyn_cast<ConstantInt>(I.getArgOperand(i))) {
- unsigned FilterLength = CI->getZExtValue();
- unsigned FirstCatch = i + FilterLength + !FilterLength;
- assert(FirstCatch <= N && "Invalid filter length");
-
- if (FirstCatch < N) {
- TyInfo.reserve(N - FirstCatch);
- for (unsigned j = FirstCatch; j < N; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addCatchTypeInfo(MBB, TyInfo);
- TyInfo.clear();
- }
-
- if (!FilterLength) {
- // Cleanup.
- MMI->addCleanup(MBB);
- } else {
- // Filter.
- TyInfo.reserve(FilterLength - 1);
- for (unsigned j = i + 1; j < FirstCatch; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addFilterTypeInfo(MBB, TyInfo);
- TyInfo.clear();
+/// 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 (auto i : post_order(T)) {
+ if (i->isFloatingPointTy()) {
+ MMI->setUsesVAFloatArgument(true);
+ return;
+ }
}
-
- N = i;
}
}
-
- if (N > 2) {
- TyInfo.reserve(N - 2);
- for (unsigned j = 2; j < N; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addCatchTypeInfo(MBB, TyInfo);
- }
}
-void llvm::CopyCatchInfo(const BasicBlock *SuccBB, const BasicBlock *LPad,
- MachineModuleInfo *MMI, FunctionLoweringInfo &FLI) {
- SmallPtrSet<const BasicBlock*, 4> Visited;
-
- // The 'eh.selector' call may not be in the direct successor of a basic block,
- // but could be several successors deeper. If we don't find it, try going one
- // level further. <rdar://problem/8824861>
- while (Visited.insert(SuccBB)) {
- for (BasicBlock::const_iterator I = SuccBB->begin(), E = --SuccBB->end();
- I != E; ++I)
- if (const EHSelectorInst *EHSel = dyn_cast<EHSelectorInst>(I)) {
- // Apply the catch info to LPad.
- AddCatchInfo(*EHSel, MMI, FLI.MBBMap[LPad]);
-#ifndef NDEBUG
- if (!FLI.MBBMap[SuccBB]->isLandingPad())
- FLI.CatchInfoFound.insert(EHSel);
-#endif
- return;
- }
-
- const BranchInst *Br = dyn_cast<BranchInst>(SuccBB->getTerminator());
- if (Br && Br->isUnconditional())
- SuccBB = Br->getSuccessor(0);
- else
- break;
+/// 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) {
+ if (const auto *PF = dyn_cast<Function>(
+ I.getParent()->getParent()->getPersonalityFn()->stripPointerCasts()))
+ MMI.addPersonality(PF);
+
+ 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<GlobalValue>(Val->stripPointerCasts()));
+ } else {
+ // Add filters in a list.
+ Constant *CVal = cast<Constant>(Val);
+ SmallVector<const GlobalValue*, 4> FilterList;
+ for (User::op_iterator
+ II = CVal->op_begin(), IE = CVal->op_end(); II != IE; ++II)
+ FilterList.push_back(cast<GlobalValue>((*II)->stripPointerCasts()));
+
+ MMI.addFilterTypeInfo(MBB, FilterList);
+ }
}
}
projects / oota-llvm.git / blobdiff