#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Module.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/Passes.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/GlobalVariable.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/Instructions.h"
-#include "llvm/Module.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/ADT/PointerUnion.h"
#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
using namespace llvm::dwarf;
// Handle the Pass registration stuff necessary to use TargetData's.
-static RegisterPass<MachineModuleInfo>
-X("machinemoduleinfo", "Module Information");
+INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo",
+ "Machine Module Information", false, false)
char MachineModuleInfo::ID = 0;
+// Out of line virtual method.
+MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
+
+namespace llvm {
+class MMIAddrLabelMapCallbackPtr : CallbackVH {
+ MMIAddrLabelMap *Map;
+public:
+ MMIAddrLabelMapCallbackPtr() : Map(0) {}
+ MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V), Map(0) {}
+
+ void setPtr(BasicBlock *BB) {
+ ValueHandleBase::operator=(BB);
+ }
+
+ void setMap(MMIAddrLabelMap *map) { Map = map; }
+
+ virtual void deleted();
+ virtual void allUsesReplacedWith(Value *V2);
+};
+
+class MMIAddrLabelMap {
+ MCContext &Context;
+ struct AddrLabelSymEntry {
+ /// Symbols - The symbols for the label. This is a pointer union that is
+ /// either one symbol (the common case) or a list of symbols.
+ PointerUnion<MCSymbol *, std::vector<MCSymbol*>*> Symbols;
+
+ Function *Fn; // The containing function of the BasicBlock.
+ unsigned Index; // The index in BBCallbacks for the BasicBlock.
+ };
+
+ DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry> AddrLabelSymbols;
+
+ /// BBCallbacks - Callbacks for the BasicBlock's that we have entries for. We
+ /// use this so we get notified if a block is deleted or RAUWd.
+ std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks;
+
+ /// DeletedAddrLabelsNeedingEmission - This is a per-function list of symbols
+ /// whose corresponding BasicBlock got deleted. These symbols need to be
+ /// emitted at some point in the file, so AsmPrinter emits them after the
+ /// function body.
+ DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >
+ DeletedAddrLabelsNeedingEmission;
+public:
+
+ MMIAddrLabelMap(MCContext &context) : Context(context) {}
+ ~MMIAddrLabelMap() {
+ assert(DeletedAddrLabelsNeedingEmission.empty() &&
+ "Some labels for deleted blocks never got emitted");
+
+ // Deallocate any of the 'list of symbols' case.
+ for (DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry>::iterator
+ I = AddrLabelSymbols.begin(), E = AddrLabelSymbols.end(); I != E; ++I)
+ if (I->second.Symbols.is<std::vector<MCSymbol*>*>())
+ delete I->second.Symbols.get<std::vector<MCSymbol*>*>();
+ }
+
+ MCSymbol *getAddrLabelSymbol(BasicBlock *BB);
+ std::vector<MCSymbol*> getAddrLabelSymbolToEmit(BasicBlock *BB);
+
+ void takeDeletedSymbolsForFunction(Function *F,
+ std::vector<MCSymbol*> &Result);
+
+ void UpdateForDeletedBlock(BasicBlock *BB);
+ void UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New);
+};
+}
+
+MCSymbol *MMIAddrLabelMap::getAddrLabelSymbol(BasicBlock *BB) {
+ assert(BB->hasAddressTaken() &&
+ "Shouldn't get label for block without address taken");
+ AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
+
+ // If we already had an entry for this block, just return it.
+ if (!Entry.Symbols.isNull()) {
+ assert(BB->getParent() == Entry.Fn && "Parent changed");
+ if (Entry.Symbols.is<MCSymbol*>())
+ return Entry.Symbols.get<MCSymbol*>();
+ return (*Entry.Symbols.get<std::vector<MCSymbol*>*>())[0];
+ }
+
+ // Otherwise, this is a new entry, create a new symbol for it and add an
+ // entry to BBCallbacks so we can be notified if the BB is deleted or RAUWd.
+ BBCallbacks.push_back(BB);
+ BBCallbacks.back().setMap(this);
+ Entry.Index = BBCallbacks.size()-1;
+ Entry.Fn = BB->getParent();
+ MCSymbol *Result = Context.CreateTempSymbol();
+ Entry.Symbols = Result;
+ return Result;
+}
+
+std::vector<MCSymbol*>
+MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
+ assert(BB->hasAddressTaken() &&
+ "Shouldn't get label for block without address taken");
+ AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
+
+ std::vector<MCSymbol*> Result;
+
+ // If we already had an entry for this block, just return it.
+ if (Entry.Symbols.isNull())
+ Result.push_back(getAddrLabelSymbol(BB));
+ else if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>())
+ Result.push_back(Sym);
+ else
+ Result = *Entry.Symbols.get<std::vector<MCSymbol*>*>();
+ return Result;
+}
+
+
+/// takeDeletedSymbolsForFunction - If we have any deleted symbols for F, return
+/// them.
+void MMIAddrLabelMap::
+takeDeletedSymbolsForFunction(Function *F, std::vector<MCSymbol*> &Result) {
+ DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >::iterator I =
+ DeletedAddrLabelsNeedingEmission.find(F);
+
+ // If there are no entries for the function, just return.
+ if (I == DeletedAddrLabelsNeedingEmission.end()) return;
+
+ // Otherwise, take the list.
+ std::swap(Result, I->second);
+ DeletedAddrLabelsNeedingEmission.erase(I);
+}
+
+
+void MMIAddrLabelMap::UpdateForDeletedBlock(BasicBlock *BB) {
+ // If the block got deleted, there is no need for the symbol. If the symbol
+ // was already emitted, we can just forget about it, otherwise we need to
+ // queue it up for later emission when the function is output.
+ AddrLabelSymEntry Entry = AddrLabelSymbols[BB];
+ AddrLabelSymbols.erase(BB);
+ assert(!Entry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
+ BBCallbacks[Entry.Index] = 0; // Clear the callback.
+
+ assert((BB->getParent() == 0 || BB->getParent() == Entry.Fn) &&
+ "Block/parent mismatch");
+
+ // Handle both the single and the multiple symbols cases.
+ if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>()) {
+ if (Sym->isDefined())
+ return;
+
+ // If the block is not yet defined, we need to emit it at the end of the
+ // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list
+ // for the containing Function. Since the block is being deleted, its
+ // parent may already be removed, we have to get the function from 'Entry'.
+ DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
+ } else {
+ std::vector<MCSymbol*> *Syms = Entry.Symbols.get<std::vector<MCSymbol*>*>();
+
+ for (unsigned i = 0, e = Syms->size(); i != e; ++i) {
+ MCSymbol *Sym = (*Syms)[i];
+ if (Sym->isDefined()) continue; // Ignore already emitted labels.
+
+ // If the block is not yet defined, we need to emit it at the end of the
+ // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list
+ // for the containing Function. Since the block is being deleted, its
+ // parent may already be removed, we have to get the function from
+ // 'Entry'.
+ DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
+ }
+
+ // The entry is deleted, free the memory associated with the symbol list.
+ delete Syms;
+ }
+}
+
+void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
+ // Get the entry for the RAUW'd block and remove it from our map.
+ AddrLabelSymEntry OldEntry = AddrLabelSymbols[Old];
+ AddrLabelSymbols.erase(Old);
+ assert(!OldEntry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
+
+ AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New];
+
+ // If New is not address taken, just move our symbol over to it.
+ if (NewEntry.Symbols.isNull()) {
+ BBCallbacks[OldEntry.Index].setPtr(New); // Update the callback.
+ NewEntry = OldEntry; // Set New's entry.
+ return;
+ }
+
+ BBCallbacks[OldEntry.Index] = 0; // Update the callback.
+
+ // Otherwise, we need to add the old symbol to the new block's set. If it is
+ // just a single entry, upgrade it to a symbol list.
+ if (MCSymbol *PrevSym = NewEntry.Symbols.dyn_cast<MCSymbol*>()) {
+ std::vector<MCSymbol*> *SymList = new std::vector<MCSymbol*>();
+ SymList->push_back(PrevSym);
+ NewEntry.Symbols = SymList;
+ }
+
+ std::vector<MCSymbol*> *SymList =
+ NewEntry.Symbols.get<std::vector<MCSymbol*>*>();
+
+ // If the old entry was a single symbol, add it.
+ if (MCSymbol *Sym = OldEntry.Symbols.dyn_cast<MCSymbol*>()) {
+ SymList->push_back(Sym);
+ return;
+ }
+
+ // Otherwise, concatenate the list.
+ std::vector<MCSymbol*> *Syms =OldEntry.Symbols.get<std::vector<MCSymbol*>*>();
+ SymList->insert(SymList->end(), Syms->begin(), Syms->end());
+ delete Syms;
+}
+
+
+void MMIAddrLabelMapCallbackPtr::deleted() {
+ Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr()));
+}
+
+void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
+ Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2));
+}
+
+
//===----------------------------------------------------------------------===//
-
-MachineModuleInfo::MachineModuleInfo()
-: ImmutablePass(&ID)
-, Lines()
-, LabelIDList()
-, FrameMoves()
-, LandingPads()
-, Personalities()
-, CallsEHReturn(0)
-, CallsUnwindInit(0)
-, DbgInfoAvailable(false)
-{
- // Always emit "no personality" info
+
+MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI,
+ const MCRegisterInfo &MRI,
+ const MCObjectFileInfo *MOFI)
+ : ImmutablePass(ID), Context(MAI, MRI, MOFI),
+ ObjFileMMI(0), CompactUnwindEncoding(0), CurCallSite(0), CallsEHReturn(0),
+ CallsUnwindInit(0), DbgInfoAvailable(false),
+ CallsExternalVAFunctionWithFloatingPointArguments(false) {
+ initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
+ // Always emit some info, by default "no personality" info.
Personalities.push_back(NULL);
+ AddrLabelSymbols = 0;
+ TheModule = 0;
+}
+
+MachineModuleInfo::MachineModuleInfo()
+ : ImmutablePass(ID),
+ Context(*(MCAsmInfo*)0, *(MCRegisterInfo*)0, (MCObjectFileInfo*)0) {
+ assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
+ "should always be explicitly constructed by LLVMTargetMachine");
+ abort();
}
+
MachineModuleInfo::~MachineModuleInfo() {
+ delete ObjFileMMI;
+ // FIXME: Why isn't doFinalization being called??
+ //assert(AddrLabelSymbols == 0 && "doFinalization not called");
+ delete AddrLabelSymbols;
+ AddrLabelSymbols = 0;
}
/// doInitialization - Initialize the state for a new module.
///
bool MachineModuleInfo::doInitialization() {
+ assert(AddrLabelSymbols == 0 && "Improperly initialized");
return false;
}
/// doFinalization - Tear down the state after completion of a module.
///
bool MachineModuleInfo::doFinalization() {
+ delete AddrLabelSymbols;
+ AddrLabelSymbols = 0;
return false;
}
-/// BeginFunction - Begin gathering function meta information.
-///
-void MachineModuleInfo::BeginFunction(MachineFunction *MF) {
- // Coming soon.
-}
-
/// EndFunction - Discard function meta information.
///
void MachineModuleInfo::EndFunction() {
// Clean up frame info.
FrameMoves.clear();
-
+
// Clean up exception info.
LandingPads.clear();
+ CallSiteMap.clear();
TypeInfos.clear();
FilterIds.clear();
FilterEnds.clear();
CallsEHReturn = 0;
CallsUnwindInit = 0;
+ CompactUnwindEncoding = 0;
+ VariableDbgInfo.clear();
}
/// AnalyzeModule - Scan the module for global debug information.
///
-void MachineModuleInfo::AnalyzeModule(Module &M) {
- // Insert functions in the llvm.used array into UsedFunctions.
- GlobalVariable *GV = M.getGlobalVariable("llvm.used");
+void MachineModuleInfo::AnalyzeModule(const Module &M) {
+ // Insert functions in the llvm.used array (but not llvm.compiler.used) into
+ // UsedFunctions.
+ const GlobalVariable *GV = M.getGlobalVariable("llvm.used");
if (!GV || !GV->hasInitializer()) return;
// Should be an array of 'i8*'.
- ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
+ const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
if (InitList == 0) return;
- for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
- if (ConstantExpr *CE = dyn_cast<ConstantExpr>(InitList->getOperand(i)))
- if (CE->getOpcode() == Instruction::BitCast)
- if (Function *F = dyn_cast<Function>(CE->getOperand(0)))
- UsedFunctions.insert(F);
- }
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
+ if (const Function *F =
+ dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
+ UsedFunctions.insert(F);
+}
+
+//===- Address of Block Management ----------------------------------------===//
+
+
+/// getAddrLabelSymbol - Return the symbol to be used for the specified basic
+/// block when its address is taken. This cannot be its normal LBB label
+/// because the block may be accessed outside its containing function.
+MCSymbol *MachineModuleInfo::getAddrLabelSymbol(const BasicBlock *BB) {
+ // Lazily create AddrLabelSymbols.
+ if (AddrLabelSymbols == 0)
+ AddrLabelSymbols = new MMIAddrLabelMap(Context);
+ return AddrLabelSymbols->getAddrLabelSymbol(const_cast<BasicBlock*>(BB));
+}
+
+/// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
+/// basic block when its address is taken. If other blocks were RAUW'd to
+/// this one, we may have to emit them as well, return the whole set.
+std::vector<MCSymbol*> MachineModuleInfo::
+getAddrLabelSymbolToEmit(const BasicBlock *BB) {
+ // Lazily create AddrLabelSymbols.
+ if (AddrLabelSymbols == 0)
+ AddrLabelSymbols = new MMIAddrLabelMap(Context);
+ return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
+}
+
+
+/// takeDeletedSymbolsForFunction - If the specified function has had any
+/// references to address-taken blocks generated, but the block got deleted,
+/// return the symbol now so we can emit it. This prevents emitting a
+/// reference to a symbol that has no definition.
+void MachineModuleInfo::
+takeDeletedSymbolsForFunction(const Function *F,
+ std::vector<MCSymbol*> &Result) {
+ // If no blocks have had their addresses taken, we're done.
+ if (AddrLabelSymbols == 0) return;
+ return AddrLabelSymbols->
+ takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result);
}
-//===-EH-------------------------------------------------------------------===//
+//===- EH -----------------------------------------------------------------===//
/// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
/// specified MachineBasicBlock.
if (LP.LandingPadBlock == LandingPad)
return LP;
}
-
+
LandingPads.push_back(LandingPadInfo(LandingPad));
return LandingPads[N];
}
/// addInvoke - Provide the begin and end labels of an invoke style call and
/// associate it with a try landing pad block.
void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
- unsigned BeginLabel, unsigned EndLabel) {
+ MCSymbol *BeginLabel, MCSymbol *EndLabel) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
LP.BeginLabels.push_back(BeginLabel);
LP.EndLabels.push_back(EndLabel);
/// addLandingPad - Provide the label of a try LandingPad block.
///
-unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
- unsigned LandingPadLabel = NextLabelID();
+MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
+ MCSymbol *LandingPadLabel = Context.CreateTempSymbol();
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
- LP.LandingPadLabel = LandingPadLabel;
+ LP.LandingPadLabel = LandingPadLabel;
return LandingPadLabel;
}
/// addPersonality - Provide the personality function for the exception
/// information.
void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
- Function *Personality) {
+ const Function *Personality) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
LP.Personality = Personality;
for (unsigned i = 0; i < Personalities.size(); ++i)
if (Personalities[i] == Personality)
return;
-
- Personalities.push_back(Personality);
+
+ // If this is the first personality we're adding go
+ // ahead and add it at the beginning.
+ if (Personalities[0] == NULL)
+ Personalities[0] = Personality;
+ else
+ Personalities.push_back(Personality);
}
/// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
///
-void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
- std::vector<GlobalVariable *> &TyInfo) {
+void MachineModuleInfo::
+addCatchTypeInfo(MachineBasicBlock *LandingPad,
+ ArrayRef<const GlobalVariable *> TyInfo) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
for (unsigned N = TyInfo.size(); N; --N)
LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
/// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
///
-void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
- std::vector<GlobalVariable *> &TyInfo) {
+void MachineModuleInfo::
+addFilterTypeInfo(MachineBasicBlock *LandingPad,
+ ArrayRef<const GlobalVariable *> TyInfo) {
LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
std::vector<unsigned> IdsInFilter(TyInfo.size());
for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
/// TidyLandingPads - Remap landing pad labels and remove any deleted landing
/// pads.
-void MachineModuleInfo::TidyLandingPads() {
+void MachineModuleInfo::TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap) {
for (unsigned i = 0; i != LandingPads.size(); ) {
LandingPadInfo &LandingPad = LandingPads[i];
- LandingPad.LandingPadLabel = MappedLabel(LandingPad.LandingPadLabel);
+ if (LandingPad.LandingPadLabel &&
+ !LandingPad.LandingPadLabel->isDefined() &&
+ (!LPMap || (*LPMap)[LandingPad.LandingPadLabel] == 0))
+ LandingPad.LandingPadLabel = 0;
// Special case: we *should* emit LPs with null LP MBB. This indicates
// "nounwind" case.
continue;
}
- for (unsigned j=0; j != LandingPads[i].BeginLabels.size(); ) {
- unsigned BeginLabel = MappedLabel(LandingPad.BeginLabels[j]);
- unsigned EndLabel = MappedLabel(LandingPad.EndLabels[j]);
-
- if (!BeginLabel || !EndLabel) {
- LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
- LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
- continue;
- }
-
- LandingPad.BeginLabels[j] = BeginLabel;
- LandingPad.EndLabels[j] = EndLabel;
- ++j;
+ for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
+ MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
+ MCSymbol *EndLabel = LandingPad.EndLabels[j];
+ if ((BeginLabel->isDefined() ||
+ (LPMap && (*LPMap)[BeginLabel] != 0)) &&
+ (EndLabel->isDefined() ||
+ (LPMap && (*LPMap)[EndLabel] != 0))) continue;
+
+ LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
+ LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
+ --j, --e;
}
// Remove landing pads with no try-ranges.
if (!LandingPad.LandingPadBlock ||
(LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
LandingPad.TypeIds.clear();
-
++i;
}
}
-/// getTypeIDFor - Return the type id for the specified typeinfo. This is
+/// setCallSiteLandingPad - Map the landing pad's EH symbol to the call site
+/// indexes.
+void MachineModuleInfo::setCallSiteLandingPad(MCSymbol *Sym,
+ ArrayRef<unsigned> Sites) {
+ for (unsigned I = 0, E = Sites.size(); I != E; ++I)
+ LPadToCallSiteMap[Sym].push_back(Sites[I]);
+}
+
+/// getTypeIDFor - Return the type id for the specified typeinfo. This is
/// function wide.
-unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
+unsigned MachineModuleInfo::getTypeIDFor(const GlobalVariable *TI) {
for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
if (TypeInfos[i] == TI) return i + 1;
}
/// getPersonality - Return the personality function for the current function.
-Function *MachineModuleInfo::getPersonality() const {
+const Function *MachineModuleInfo::getPersonality() const {
// FIXME: Until PR1414 will be fixed, we're using 1 personality function per
// function
return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
}
/// getPersonalityIndex - Return unique index for current personality
-/// function. NULL personality function should always get zero index.
+/// function. NULL/first personality function should always get zero index.
unsigned MachineModuleInfo::getPersonalityIndex() const {
const Function* Personality = NULL;
-
+
// Scan landing pads. If there is at least one non-NULL personality - use it.
for (unsigned i = 0; i != LandingPads.size(); ++i)
if (LandingPads[i].Personality) {
Personality = LandingPads[i].Personality;
break;
}
-
+
for (unsigned i = 0; i < Personalities.size(); ++i) {
if (Personalities[i] == Personality)
return i;
}
- // This should never happen
- assert(0 && "Personality function should be set!");
+ // This will happen if the current personality function is
+ // in the zero index.
return 0;
}
-
-//===----------------------------------------------------------------------===//
-/// DebugLabelFolding pass - This pass prunes out redundant labels. This allows
-/// a info consumer to determine if the range of two labels is empty, by seeing
-/// if the labels map to the same reduced label.
-
-namespace llvm {
-
-struct DebugLabelFolder : public MachineFunctionPass {
- static char ID;
- DebugLabelFolder() : MachineFunctionPass(&ID) {}
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addPreservedID(MachineLoopInfoID);
- AU.addPreservedID(MachineDominatorsID);
- MachineFunctionPass::getAnalysisUsage(AU);
- }
-
- virtual bool runOnMachineFunction(MachineFunction &MF);
- virtual const char *getPassName() const { return "Label Folder"; }
-};
-
-char DebugLabelFolder::ID = 0;
-
-bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
- // Get machine module info.
- MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
- if (!MMI) return false;
-
- // Track if change is made.
- bool MadeChange = false;
- // No prior label to begin.
- unsigned PriorLabel = 0;
-
- // Iterate through basic blocks.
- for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
- BB != E; ++BB) {
- // Iterate through instructions.
- for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
- // Is it a label.
- if (I->isDebugLabel()) {
- // The label ID # is always operand #0, an immediate.
- unsigned NextLabel = I->getOperand(0).getImm();
-
- // If there was an immediate prior label.
- if (PriorLabel) {
- // Remap the current label to prior label.
- MMI->RemapLabel(NextLabel, PriorLabel);
- // Delete the current label.
- I = BB->erase(I);
- // Indicate a change has been made.
- MadeChange = true;
- continue;
- } else {
- // Start a new round.
- PriorLabel = NextLabel;
- }
- } else {
- // No consecutive labels.
- PriorLabel = 0;
- }
-
- ++I;
- }
- }
-
- return MadeChange;
-}
-
-FunctionPass *createDebugLabelFoldingPass() { return new DebugLabelFolder(); }
-
-}
-