//===-- Function.cpp - Implement the Global object classes ----------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
-// This file implements the Function & GlobalVariable classes for the VMCore
-// library.
+// This file implements the Function class for the VMCore library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/DerivedTypes.h"
-#include "llvm/iOther.h"
-#include "llvm/Intrinsics.h"
-#include "Support/LeakDetector.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/Support/LeakDetector.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/StringPool.h"
#include "SymbolTableListTraitsImpl.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringExtras.h"
using namespace llvm;
-BasicBlock *ilist_traits<BasicBlock>::createNode() {
+BasicBlock *ilist_traits<BasicBlock>::createSentinel() {
BasicBlock *Ret = new BasicBlock();
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return F->getBasicBlockList();
}
-Argument *ilist_traits<Argument>::createNode() {
- Argument *Ret = new Argument(Type::IntTy);
+Argument *ilist_traits<Argument>::createSentinel() {
+ Argument *Ret = new Argument(Type::Int32Ty);
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
// Explicit instantiations of SymbolTableListTraits since some of the methods
// are not in the public header file...
-template class SymbolTableListTraits<Argument, Function, Function>;
-template class SymbolTableListTraits<BasicBlock, Function, Function>;
+template class SymbolTableListTraits<Argument, Function>;
+template class SymbolTableListTraits<BasicBlock, Function>;
//===----------------------------------------------------------------------===//
// Argument Implementation
//===----------------------------------------------------------------------===//
-Argument::Argument(const Type *Ty, const std::string &Name, Function *Par)
- : Value(Ty, Value::ArgumentVal, Name) {
+Argument::Argument(const Type *Ty, const std::string &Name, Function *Par)
+ : Value(Ty, Value::ArgumentVal) {
Parent = 0;
// Make sure that we get added to a function
if (Par)
Par->getArgumentList().push_back(this);
-}
-
-
-// Specialize setName to take care of symbol table majik
-void Argument::setName(const std::string &name, SymbolTable *ST) {
- Function *P;
- assert((ST == 0 || (!getParent() || ST == &getParent()->getSymbolTable())) &&
- "Invalid symtab argument!");
- if ((P = getParent()) && hasName()) P->getSymbolTable().remove(this);
- Value::setName(name);
- if (P && hasName()) P->getSymbolTable().insert(this);
+ setName(Name);
}
void Argument::setParent(Function *parent) {
LeakDetector::removeGarbageObject(this);
}
+//===----------------------------------------------------------------------===//
+// ParamAttrsList Implementation
+//===----------------------------------------------------------------------===//
+
+uint16_t
+ParamAttrsList::getParamAttrs(uint16_t Index) const {
+ unsigned limit = attrs.size();
+ for (unsigned i = 0; i < limit && attrs[i].index <= Index; ++i)
+ if (attrs[i].index == Index)
+ return attrs[i].attrs;
+ return ParamAttr::None;
+}
+
+std::string
+ParamAttrsList::getParamAttrsText(uint16_t Attrs) {
+ std::string Result;
+ if (Attrs & ParamAttr::ZExt)
+ Result += "zeroext ";
+ if (Attrs & ParamAttr::SExt)
+ Result += "signext ";
+ if (Attrs & ParamAttr::NoReturn)
+ Result += "noreturn ";
+ if (Attrs & ParamAttr::NoUnwind)
+ Result += "nounwind ";
+ if (Attrs & ParamAttr::InReg)
+ Result += "inreg ";
+ if (Attrs & ParamAttr::NoAlias)
+ Result += "noalias ";
+ if (Attrs & ParamAttr::StructRet)
+ Result += "sret ";
+ if (Attrs & ParamAttr::ByVal)
+ Result += "byval ";
+ if (Attrs & ParamAttr::Nest)
+ Result += "nest ";
+ if (Attrs & ParamAttr::ReadNone)
+ Result += "readnone ";
+ if (Attrs & ParamAttr::ReadOnly)
+ Result += "readonly ";
+ return Result;
+}
+
+/// onlyInformative - Returns whether only informative attributes are set.
+static inline bool onlyInformative(uint16_t attrs) {
+ return !(attrs & ~ParamAttr::Informative);
+}
+
+bool
+ParamAttrsList::areCompatible(const ParamAttrsList *A, const ParamAttrsList *B){
+ if (A == B)
+ return true;
+ unsigned ASize = A ? A->size() : 0;
+ unsigned BSize = B ? B->size() : 0;
+ unsigned AIndex = 0;
+ unsigned BIndex = 0;
+
+ while (AIndex < ASize && BIndex < BSize) {
+ uint16_t AIdx = A->getParamIndex(AIndex);
+ uint16_t BIdx = B->getParamIndex(BIndex);
+ uint16_t AAttrs = A->getParamAttrsAtIndex(AIndex);
+ uint16_t BAttrs = B->getParamAttrsAtIndex(AIndex);
+
+ if (AIdx < BIdx) {
+ if (!onlyInformative(AAttrs))
+ return false;
+ ++AIndex;
+ } else if (BIdx < AIdx) {
+ if (!onlyInformative(BAttrs))
+ return false;
+ ++BIndex;
+ } else {
+ if (!onlyInformative(AAttrs ^ BAttrs))
+ return false;
+ ++AIndex;
+ ++BIndex;
+ }
+ }
+ for (; AIndex < ASize; ++AIndex)
+ if (!onlyInformative(A->getParamAttrsAtIndex(AIndex)))
+ return false;
+ for (; BIndex < BSize; ++BIndex)
+ if (!onlyInformative(B->getParamAttrsAtIndex(AIndex)))
+ return false;
+ return true;
+}
+
+void
+ParamAttrsList::Profile(FoldingSetNodeID &ID) const {
+ for (unsigned i = 0; i < attrs.size(); ++i) {
+ uint32_t val = uint32_t(attrs[i].attrs) << 16 | attrs[i].index;
+ ID.AddInteger(val);
+ }
+}
+
+static ManagedStatic<FoldingSet<ParamAttrsList> > ParamAttrsLists;
+
+const ParamAttrsList *
+ParamAttrsList::get(const ParamAttrsVector &attrVec) {
+ // If there are no attributes then return a null ParamAttrsList pointer.
+ if (attrVec.empty())
+ return 0;
+
+#ifndef NDEBUG
+ for (unsigned i = 0, e = attrVec.size(); i < e; ++i) {
+ assert(attrVec[i].attrs != ParamAttr::None
+ && "Pointless parameter attribute!");
+ assert((!i || attrVec[i-1].index < attrVec[i].index)
+ && "Misordered ParamAttrsList!");
+ }
+#endif
+
+ // Otherwise, build a key to look up the existing attributes.
+ ParamAttrsList key(attrVec);
+ FoldingSetNodeID ID;
+ key.Profile(ID);
+ void *InsertPos;
+ ParamAttrsList* PAL = ParamAttrsLists->FindNodeOrInsertPos(ID, InsertPos);
+
+ // If we didn't find any existing attributes of the same shape then
+ // create a new one and insert it.
+ if (!PAL) {
+ PAL = new ParamAttrsList(attrVec);
+ ParamAttrsLists->InsertNode(PAL, InsertPos);
+ }
+
+ // Return the ParamAttrsList that we found or created.
+ return PAL;
+}
+
+const ParamAttrsList *
+ParamAttrsList::getModified(const ParamAttrsList *PAL,
+ const ParamAttrsVector &modVec) {
+ if (modVec.empty())
+ return PAL;
+
+#ifndef NDEBUG
+ for (unsigned i = 0, e = modVec.size(); i < e; ++i)
+ assert((!i || modVec[i-1].index < modVec[i].index)
+ && "Misordered ParamAttrsList!");
+#endif
+
+ if (!PAL) {
+ // Strip any instances of ParamAttr::None from modVec before calling 'get'.
+ ParamAttrsVector newVec;
+ for (unsigned i = 0, e = modVec.size(); i < e; ++i)
+ if (modVec[i].attrs != ParamAttr::None)
+ newVec.push_back(modVec[i]);
+ return get(newVec);
+ }
+
+ const ParamAttrsVector &oldVec = PAL->attrs;
+
+ ParamAttrsVector newVec;
+ unsigned oldI = 0;
+ unsigned modI = 0;
+ unsigned oldE = oldVec.size();
+ unsigned modE = modVec.size();
+
+ while (oldI < oldE && modI < modE) {
+ uint16_t oldIndex = oldVec[oldI].index;
+ uint16_t modIndex = modVec[modI].index;
+
+ if (oldIndex < modIndex) {
+ newVec.push_back(oldVec[oldI]);
+ ++oldI;
+ } else if (modIndex < oldIndex) {
+ if (modVec[modI].attrs != ParamAttr::None)
+ newVec.push_back(modVec[modI]);
+ ++modI;
+ } else {
+ // Same index - overwrite or delete existing attributes.
+ if (modVec[modI].attrs != ParamAttr::None)
+ newVec.push_back(modVec[modI]);
+ ++oldI;
+ ++modI;
+ }
+ }
+
+ for (; oldI < oldE; ++oldI)
+ newVec.push_back(oldVec[oldI]);
+ for (; modI < modE; ++modI)
+ if (modVec[modI].attrs != ParamAttr::None)
+ newVec.push_back(modVec[modI]);
+
+ return get(newVec);
+}
+
+ParamAttrsList::~ParamAttrsList() {
+ ParamAttrsLists->RemoveNode(this);
+}
//===----------------------------------------------------------------------===//
// Function Implementation
Function::Function(const FunctionType *Ty, LinkageTypes Linkage,
const std::string &name, Module *ParentModule)
- : GlobalValue(PointerType::get(Ty), Value::FunctionVal, Linkage, name) {
- BasicBlocks.setItemParent(this);
- BasicBlocks.setParent(this);
- ArgumentList.setItemParent(this);
- ArgumentList.setParent(this);
- SymTab = new SymbolTable();
+ : GlobalValue(PointerType::getUnqual(Ty),
+ Value::FunctionVal, 0, 0, Linkage, name),
+ ParamAttrs(0) {
+ SymTab = new ValueSymbolTable();
assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy)
&& "LLVM functions cannot return aggregate values!");
- // Create the arguments vector, all arguments start out unnamed.
- for (unsigned i = 0, e = Ty->getNumParams(); i != e; ++i) {
- assert(Ty->getParamType(i) != Type::VoidTy &&
- "Cannot have void typed arguments!");
- ArgumentList.push_back(new Argument(Ty->getParamType(i)));
- }
-
+ // If the function has arguments, mark them as lazily built.
+ if (Ty->getNumParams())
+ SubclassData = 1; // Set the "has lazy arguments" bit.
+
// Make sure that we get added to a function
LeakDetector::addGarbageObject(this);
// Delete all of the method arguments and unlink from symbol table...
ArgumentList.clear();
- ArgumentList.setParent(0);
delete SymTab;
+
+ // Drop our reference to the parameter attributes, if any.
+ if (ParamAttrs)
+ ParamAttrs->dropRef();
+
+ // Remove the function from the on-the-side collector table.
+ clearCollector();
+}
+
+void Function::BuildLazyArguments() const {
+ // Create the arguments vector, all arguments start out unnamed.
+ const FunctionType *FT = getFunctionType();
+ for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
+ assert(FT->getParamType(i) != Type::VoidTy &&
+ "Cannot have void typed arguments!");
+ ArgumentList.push_back(new Argument(FT->getParamType(i)));
+ }
+
+ // Clear the lazy arguments bit.
+ const_cast<Function*>(this)->SubclassData &= ~1;
}
-// Specialize setName to take care of symbol table majik
-void Function::setName(const std::string &name, SymbolTable *ST) {
- Module *P;
- assert((ST == 0 || (!getParent() || ST == &getParent()->getSymbolTable())) &&
- "Invalid symtab argument!");
- if ((P = getParent()) && hasName()) P->getSymbolTable().remove(this);
- Value::setName(name);
- if (P && hasName()) P->getSymbolTable().insert(this);
+size_t Function::arg_size() const {
+ return getFunctionType()->getNumParams();
+}
+bool Function::arg_empty() const {
+ return getFunctionType()->getNumParams() == 0;
}
void Function::setParent(Module *parent) {
LeakDetector::removeGarbageObject(this);
}
+void Function::setParamAttrs(const ParamAttrsList *attrs) {
+ // Avoid deleting the ParamAttrsList if they are setting the
+ // attributes to the same list.
+ if (ParamAttrs == attrs)
+ return;
+
+ // Drop reference on the old ParamAttrsList
+ if (ParamAttrs)
+ ParamAttrs->dropRef();
+
+ // Add reference to the new ParamAttrsList
+ if (attrs)
+ attrs->addRef();
+
+ // Set the new ParamAttrsList.
+ ParamAttrs = attrs;
+}
+
const FunctionType *Function::getFunctionType() const {
return cast<FunctionType>(getType()->getElementType());
}
-const Type *Function::getReturnType() const {
+bool Function::isVarArg() const {
+ return getFunctionType()->isVarArg();
+}
+
+const Type *Function::getReturnType() const {
return getFunctionType()->getReturnType();
}
+void Function::removeFromParent() {
+ getParent()->getFunctionList().remove(this);
+}
+
+void Function::eraseFromParent() {
+ getParent()->getFunctionList().erase(this);
+}
+
// dropAllReferences() - This function causes all the subinstructions to "let
// go" of all references that they are maintaining. This allows one to
// 'delete' a whole class at a time, even though there may be circular
// references... first all references are dropped, and all use counts go to
// zero. Then everything is deleted for real. Note that no operations are
-// valid on an object that has "dropped all references", except operator
+// valid on an object that has "dropped all references", except operator
// delete.
//
void Function::dropAllReferences() {
BasicBlocks.clear(); // Delete all basic blocks...
}
+// Maintain the collector name for each function in an on-the-side table. This
+// saves allocating an additional word in Function for programs which do not use
+// GC (i.e., most programs) at the cost of increased overhead for clients which
+// do use GC.
+static DenseMap<const Function*,PooledStringPtr> *CollectorNames;
+static StringPool *CollectorNamePool;
+
+bool Function::hasCollector() const {
+ return CollectorNames && CollectorNames->count(this);
+}
+
+const char *Function::getCollector() const {
+ assert(hasCollector() && "Function has no collector");
+ return *(*CollectorNames)[this];
+}
+
+void Function::setCollector(const char *Str) {
+ if (!CollectorNamePool)
+ CollectorNamePool = new StringPool();
+ if (!CollectorNames)
+ CollectorNames = new DenseMap<const Function*,PooledStringPtr>();
+ (*CollectorNames)[this] = CollectorNamePool->intern(Str);
+}
+
+void Function::clearCollector() {
+ if (CollectorNames) {
+ CollectorNames->erase(this);
+ if (CollectorNames->empty()) {
+ delete CollectorNames;
+ CollectorNames = 0;
+ if (CollectorNamePool->empty()) {
+ delete CollectorNamePool;
+ CollectorNamePool = 0;
+ }
+ }
+ }
+}
+
/// getIntrinsicID - This method returns the ID number of the specified
/// function, or Intrinsic::not_intrinsic if the function is not an
/// intrinsic, or if the pointer is null. This value is always defined to be
/// particular intrinsic functions which correspond to this value are defined in
/// llvm/Intrinsics.h.
///
-unsigned Function::getIntrinsicID() const {
- if (getName().size() < 5 || getName()[4] != '.' || getName()[0] != 'l' ||
- getName()[1] != 'l' || getName()[2] != 'v' || getName()[3] != 'm')
+unsigned Function::getIntrinsicID(bool noAssert) const {
+ const ValueName *ValName = this->getValueName();
+ if (!ValName)
+ return 0;
+ unsigned Len = ValName->getKeyLength();
+ const char *Name = ValName->getKeyData();
+
+ if (Len < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
+ || Name[2] != 'v' || Name[3] != 'm')
return 0; // All intrinsics start with 'llvm.'
- assert(getName().size() != 5 && "'llvm.' is an invalid intrinsic name!");
-
- // a table of all Alpha intrinsic functions
- struct {
- std::string name; // The name of the intrinsic
- unsigned id; // Its ID number
- } alpha_intrinsics[] = {
- { "llvm.alpha.ctlz", Intrinsic::alpha_ctlz },
- { "llvm.alpha.cttz", Intrinsic::alpha_cttz },
- { "llvm.alpha.ctpop", Intrinsic::alpha_ctpop },
- { "llvm.alpha.umulh", Intrinsic::alpha_umulh },
- { "llvm.alpha.vecop", Intrinsic::alpha_vecop },
- { "llvm.alpha.pup", Intrinsic::alpha_pup },
- { "llvm.alpha.bytezap", Intrinsic::alpha_bytezap },
- { "llvm.alpha.bytemanip", Intrinsic::alpha_bytemanip },
- { "llvm.alpha.dfp_bop", Intrinsic::alpha_dfpbop },
- { "llvm.alpha.dfp_uop", Intrinsic::alpha_dfpuop },
- { "llvm.alpha.unordered", Intrinsic::alpha_unordered },
- { "llvm.alpha.uqtodfp", Intrinsic::alpha_uqtodfp },
- { "llvm.alpha.uqtosfp", Intrinsic::alpha_uqtosfp },
- { "llvm.alpha.dfptosq", Intrinsic::alpha_dfptosq },
- { "llvm.alpha.sfptosq", Intrinsic::alpha_sfptosq },
- };
- const unsigned num_alpha_intrinsics =
- sizeof(alpha_intrinsics) / sizeof(*alpha_intrinsics);
-
- switch (getName()[5]) {
- case 'a':
- if (getName().size() > 11 &&
- std::string(getName().begin()+4, getName().begin()+11) == ".alpha.")
- for (unsigned i = 0; i < num_alpha_intrinsics; ++i)
- if (getName() == alpha_intrinsics[i].name)
- return alpha_intrinsics[i].id;
- break;
- case 'd':
- if (getName() == "llvm.dbg.stoppoint") return Intrinsic::dbg_stoppoint;
- if (getName() == "llvm.dbg.region.start")return Intrinsic::dbg_region_start;
- if (getName() == "llvm.dbg.region.end") return Intrinsic::dbg_region_end;
- if (getName() == "llvm.dbg.func.start") return Intrinsic::dbg_func_start;
- if (getName() == "llvm.dbg.declare") return Intrinsic::dbg_declare;
- break;
- case 'f':
- if (getName() == "llvm.frameaddress") return Intrinsic::frameaddress;
- break;
- case 'l':
- if (getName() == "llvm.longjmp") return Intrinsic::longjmp;
- break;
- case 'm':
- if (getName() == "llvm.memcpy") return Intrinsic::memcpy;
- if (getName() == "llvm.memmove") return Intrinsic::memmove;
- if (getName() == "llvm.memset") return Intrinsic::memset;
- break;
- case 'r':
- if (getName() == "llvm.returnaddress") return Intrinsic::returnaddress;
- if (getName() == "llvm.readport") return Intrinsic::readport;
- if (getName() == "llvm.readio") return Intrinsic::readio;
- break;
- case 's':
- if (getName() == "llvm.setjmp") return Intrinsic::setjmp;
- if (getName() == "llvm.sigsetjmp") return Intrinsic::sigsetjmp;
- if (getName() == "llvm.siglongjmp") return Intrinsic::siglongjmp;
- break;
- case 'v':
- if (getName() == "llvm.va_copy") return Intrinsic::vacopy;
- if (getName() == "llvm.va_end") return Intrinsic::vaend;
- if (getName() == "llvm.va_start") return Intrinsic::vastart;
- case 'w':
- if (getName() == "llvm.writeport") return Intrinsic::writeport;
- if (getName() == "llvm.writeio") return Intrinsic::writeio;
- break;
- }
- // The "llvm." namespace is reserved!
- assert(0 && "Unknown LLVM intrinsic function!");
+ assert((Len != 5 || noAssert) && "'llvm.' is an invalid intrinsic name!");
+
+#define GET_FUNCTION_RECOGNIZER
+#include "llvm/Intrinsics.gen"
+#undef GET_FUNCTION_RECOGNIZER
+ assert(noAssert && "Invalid LLVM intrinsic name");
return 0;
}
+std::string Intrinsic::getName(ID id, const Type **Tys, unsigned numTys) {
+ assert(id < num_intrinsics && "Invalid intrinsic ID!");
+ const char * const Table[] = {
+ "not_intrinsic",
+#define GET_INTRINSIC_NAME_TABLE
+#include "llvm/Intrinsics.gen"
+#undef GET_INTRINSIC_NAME_TABLE
+ };
+ if (numTys == 0)
+ return Table[id];
+ std::string Result(Table[id]);
+ for (unsigned i = 0; i < numTys; ++i)
+ if (Tys[i])
+ Result += "." + MVT::getValueTypeString(MVT::getValueType(Tys[i]));
+ return Result;
+}
-//===----------------------------------------------------------------------===//
-// GlobalVariable Implementation
-//===----------------------------------------------------------------------===//
+const FunctionType *Intrinsic::getType(ID id, const Type **Tys,
+ unsigned numTys) {
+ const Type *ResultTy = NULL;
+ std::vector<const Type*> ArgTys;
+ bool IsVarArg = false;
+
+#define GET_INTRINSIC_GENERATOR
+#include "llvm/Intrinsics.gen"
+#undef GET_INTRINSIC_GENERATOR
+
+ return FunctionType::get(ResultTy, ArgTys, IsVarArg);
+}
-GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
- Constant *Initializer,
- const std::string &Name, Module *ParentModule)
- : GlobalValue(PointerType::get(Ty), Value::GlobalVariableVal, Link, Name),
- isConstantGlobal(constant) {
- if (Initializer) Operands.push_back(Use((Value*)Initializer, this));
+const ParamAttrsList *Intrinsic::getParamAttrs(ID id) {
+ static const ParamAttrsList *IntrinsicAttributes[Intrinsic::num_intrinsics];
- LeakDetector::addGarbageObject(this);
+ if (IntrinsicAttributes[id])
+ return IntrinsicAttributes[id];
- if (ParentModule)
- ParentModule->getGlobalList().push_back(this);
+ ParamAttrsVector Attrs;
+ uint16_t Attr = ParamAttr::None;
+
+#define GET_INTRINSIC_ATTRIBUTES
+#include "llvm/Intrinsics.gen"
+#undef GET_INTRINSIC_ATTRIBUTES
+
+ // Intrinsics cannot throw exceptions.
+ Attr |= ParamAttr::NoUnwind;
+
+ Attrs.push_back(ParamAttrsWithIndex::get(0, Attr));
+ IntrinsicAttributes[id] = ParamAttrsList::get(Attrs);
+ return IntrinsicAttributes[id];
}
-void GlobalVariable::setParent(Module *parent) {
- if (getParent())
- LeakDetector::addGarbageObject(this);
- Parent = parent;
- if (getParent())
- LeakDetector::removeGarbageObject(this);
+Function *Intrinsic::getDeclaration(Module *M, ID id, const Type **Tys,
+ unsigned numTys) {
+ // There can never be multiple globals with the same name of different types,
+ // because intrinsics must be a specific type.
+ Function *F =
+ cast<Function>(M->getOrInsertFunction(getName(id, Tys, numTys),
+ getType(id, Tys, numTys)));
+ F->setParamAttrs(getParamAttrs(id));
+ return F;
}
-// Specialize setName to take care of symbol table majik
-void GlobalVariable::setName(const std::string &name, SymbolTable *ST) {
- Module *P;
- assert((ST == 0 || (!getParent() || ST == &getParent()->getSymbolTable())) &&
- "Invalid symtab argument!");
- if ((P = getParent()) && hasName()) P->getSymbolTable().remove(this);
- Value::setName(name);
- if (P && hasName()) P->getSymbolTable().insert(this);
+Value *IntrinsicInst::StripPointerCasts(Value *Ptr) {
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
+ if (CE->getOpcode() == Instruction::BitCast) {
+ if (isa<PointerType>(CE->getOperand(0)->getType()))
+ return StripPointerCasts(CE->getOperand(0));
+ } else if (CE->getOpcode() == Instruction::GetElementPtr) {
+ for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
+ if (!CE->getOperand(i)->isNullValue())
+ return Ptr;
+ return StripPointerCasts(CE->getOperand(0));
+ }
+ return Ptr;
+ }
+
+ if (BitCastInst *CI = dyn_cast<BitCastInst>(Ptr)) {
+ if (isa<PointerType>(CI->getOperand(0)->getType()))
+ return StripPointerCasts(CI->getOperand(0));
+ } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
+ if (GEP->hasAllZeroIndices())
+ return StripPointerCasts(GEP->getOperand(0));
+ }
+ return Ptr;
}
+
+// vim: sw=2 ai
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