X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FVMCore%2FFunction.cpp;h=7533185be1daf94e028fe0052b71e1e1a98049b2;hb=ebcba612b537f45a033ccd9a60bee0c45e2e2ded;hp=16728f6a0ca994628a2b345cd9a7e9744f6a2b37;hpb=757d243167a52fef433146be11fa1462f6468270;p=oota-llvm.git diff --git a/lib/VMCore/Function.cpp b/lib/VMCore/Function.cpp index 16728f6a0ca..7533185be1d 100644 --- a/lib/VMCore/Function.cpp +++ b/lib/VMCore/Function.cpp @@ -2,8 +2,8 @@ // // 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 is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // @@ -16,13 +16,15 @@ #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::createSentinel() { - BasicBlock *Ret = new BasicBlock(); + BasicBlock *Ret = BasicBlock::Create(); // This should not be garbage monitored. LeakDetector::removeGarbageObject(Ret); return Ret; @@ -72,194 +74,79 @@ void Argument::setParent(Function *parent) { LeakDetector::removeGarbageObject(this); } -//===----------------------------------------------------------------------===// -// ParamAttrsList Implementation -//===----------------------------------------------------------------------===// +/// getArgNo - Return the index of this formal argument in its containing +/// function. For example in "void foo(int a, float b)" a is 0 and b is 1. +unsigned Argument::getArgNo() const { + const Function *F = getParent(); + assert(F && "Argument is not in a function"); + + Function::const_arg_iterator AI = F->arg_begin(); + unsigned ArgIdx = 0; + for (; &*AI != this; ++AI) + ++ArgIdx; -uint16_t -ParamAttrsList::getParamAttrs(uint16_t Index) const { - unsigned limit = attrs.size(); - for (unsigned i = 0; i < limit; ++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; + return ArgIdx; } -/// 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); - } +/// hasByValAttr - Return true if this argument has the byval attribute on it +/// in its containing function. +bool Argument::hasByValAttr() const { + if (!isa(getType())) return false; + return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::ByVal); } -static ManagedStatic > ParamAttrsLists; +/// hasNoAliasAttr - Return true if this argument has the noalias attribute on +/// it in its containing function. +bool Argument::hasNoAliasAttr() const { + if (!isa(getType())) return false; + return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::NoAlias); +} -const ParamAttrsList * -ParamAttrsList::get(const ParamAttrsVector &attrVec) { - // If there are no attributes then return a null ParamAttrsList pointer. - if (attrVec.empty()) - return 0; +/// hasSRetAttr - Return true if this argument has the sret attribute on +/// it in its containing function. +bool Argument::hasStructRetAttr() const { + if (!isa(getType())) return false; + if (this != getParent()->arg_begin()) + return false; // StructRet param must be first param + return getParent()->paramHasAttr(1, ParamAttr::StructRet); +} -#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); - } +/// addAttr - Add a ParamAttr to an argument +void Argument::addAttr(ParameterAttributes attr) { + getParent()->setParamAttrs( + getParent()->getParamAttrs().addAttr(getArgNo() + 1, attr)); +} + +/// removeAttr - Remove a ParamAttr from an argument +void Argument::removeAttr(ParameterAttributes attr) { + getParent()->setParamAttrs( + getParent()->getParamAttrs().removeAttr(getArgNo() + 1, attr)); +} - // 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]); +//===----------------------------------------------------------------------===// +// Helper Methods in Function +//===----------------------------------------------------------------------===// + +const FunctionType *Function::getFunctionType() const { + return cast(getType()->getElementType()); +} + +bool Function::isVarArg() const { + return getFunctionType()->isVarArg(); +} - return get(newVec); +const Type *Function::getReturnType() const { + return getFunctionType()->getReturnType(); +} + +void Function::removeFromParent() { + getParent()->getFunctionList().remove(this); } -ParamAttrsList::~ParamAttrsList() { - ParamAttrsLists->RemoveNode(this); +void Function::eraseFromParent() { + getParent()->getFunctionList().erase(this); } //===----------------------------------------------------------------------===// @@ -268,11 +155,12 @@ ParamAttrsList::~ParamAttrsList() { Function::Function(const FunctionType *Ty, LinkageTypes Linkage, const std::string &name, Module *ParentModule) - : GlobalValue(PointerType::get(Ty), Value::FunctionVal, 0, 0, Linkage, name), - ParamAttrs(0) { + : GlobalValue(PointerType::getUnqual(Ty), + Value::FunctionVal, 0, 0, Linkage, name) { SymTab = new ValueSymbolTable(); - assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy) + assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy + || isa(getReturnType())) && "LLVM functions cannot return aggregate values!"); // If the function has arguments, mark them as lazily built. @@ -284,6 +172,10 @@ Function::Function(const FunctionType *Ty, LinkageTypes Linkage, if (ParentModule) ParentModule->getFunctionList().push_back(this); + + // Ensure intrinsics have the right parameter attributes. + if (unsigned IID = getIntrinsicID(true)) + setParamAttrs(Intrinsic::getParamAttrs(Intrinsic::ID(IID))); } Function::~Function() { @@ -293,9 +185,8 @@ Function::~Function() { ArgumentList.clear(); 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 { @@ -326,56 +217,83 @@ 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(); +// 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 +// delete. +// +void Function::dropAllReferences() { + for (iterator I = begin(), E = end(); I != E; ++I) + I->dropAllReferences(); + BasicBlocks.clear(); // Delete all basic blocks... +} - // Set the new ParamAttrsList. - ParamAttrs = attrs; +void Function::setDoesNotThrow(bool doesNotThrow) { + PAListPtr PAL = getParamAttrs(); + if (doesNotThrow) + PAL = PAL.addAttr(0, ParamAttr::NoUnwind); + else + PAL = PAL.removeAttr(0, ParamAttr::NoUnwind); + setParamAttrs(PAL); } -const FunctionType *Function::getFunctionType() const { - return cast(getType()->getElementType()); +void Function::addParamAttr(unsigned i, ParameterAttributes attr) { + PAListPtr PAL = getParamAttrs(); + PAL = PAL.addAttr(i, attr); + setParamAttrs(PAL); } -bool Function::isVarArg() const { - return getFunctionType()->isVarArg(); +// 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 *CollectorNames; +static StringPool *CollectorNamePool; + +bool Function::hasCollector() const { + return CollectorNames && CollectorNames->count(this); } -const Type *Function::getReturnType() const { - return getFunctionType()->getReturnType(); +const char *Function::getCollector() const { + assert(hasCollector() && "Function has no collector"); + return *(*CollectorNames)[this]; } -void Function::removeFromParent() { - getParent()->getFunctionList().remove(this); +void Function::setCollector(const char *Str) { + if (!CollectorNamePool) + CollectorNamePool = new StringPool(); + if (!CollectorNames) + CollectorNames = new DenseMap(); + (*CollectorNames)[this] = CollectorNamePool->intern(Str); } -void Function::eraseFromParent() { - getParent()->getFunctionList().erase(this); +void Function::clearCollector() { + if (CollectorNames) { + CollectorNames->erase(this); + if (CollectorNames->empty()) { + delete CollectorNames; + CollectorNames = 0; + if (CollectorNamePool->empty()) { + delete CollectorNamePool; + CollectorNamePool = 0; + } + } + } } -// 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 -// delete. -// -void Function::dropAllReferences() { - for (iterator I = begin(), E = end(); I != E; ++I) - I->dropAllReferences(); - BasicBlocks.clear(); // Delete all basic blocks... +/// copyAttributesFrom - copy all additional attributes (those not needed to +/// create a Function) from the Function Src to this one. +void Function::copyAttributesFrom(const GlobalValue *Src) { + assert(isa(Src) && "Expected a Function!"); + GlobalValue::copyAttributesFrom(Src); + const Function *SrcF = cast(Src); + setCallingConv(SrcF->getCallingConv()); + setParamAttrs(SrcF->getParamAttrs()); + if (SrcF->hasCollector()) + setCollector(SrcF->getCollector()); } /// getIntrinsicID - This method returns the ID number of the specified @@ -418,7 +336,7 @@ std::string Intrinsic::getName(ID id, const Type **Tys, unsigned numTys) { std::string Result(Table[id]); for (unsigned i = 0; i < numTys; ++i) if (Tys[i]) - Result += "." + MVT::getValueTypeString(MVT::getValueType(Tys[i])); + Result += "." + MVT::getMVT(Tys[i]).getMVTString(); return Result; } @@ -435,36 +353,27 @@ const FunctionType *Intrinsic::getType(ID id, const Type **Tys, return FunctionType::get(ResultTy, ArgTys, IsVarArg); } +PAListPtr Intrinsic::getParamAttrs(ID id) { + ParameterAttributes Attr = ParamAttr::None; + +#define GET_INTRINSIC_ATTRIBUTES +#include "llvm/Intrinsics.gen" +#undef GET_INTRINSIC_ATTRIBUTES + + // Intrinsics cannot throw exceptions. + Attr |= ParamAttr::NoUnwind; + + ParamAttrsWithIndex PAWI = ParamAttrsWithIndex::get(0, Attr); + return PAListPtr::get(&PAWI, 1); +} + 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. - return cast(M->getOrInsertFunction(getName(id, Tys, numTys), - getType(id, Tys, numTys))); -} - -Value *IntrinsicInst::StripPointerCasts(Value *Ptr) { - if (ConstantExpr *CE = dyn_cast(Ptr)) { - if (CE->getOpcode() == Instruction::BitCast) { - if (isa(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(Ptr)) { - if (isa(CI->getOperand(0)->getType())) - return StripPointerCasts(CI->getOperand(0)); - } else if (GetElementPtrInst *GEP = dyn_cast(Ptr)) { - if (GEP->hasAllZeroIndices()) - return StripPointerCasts(GEP->getOperand(0)); - } - return Ptr; + // There can never be multiple globals with the same name of different types, + // because intrinsics must be a specific type. + return + cast(M->getOrInsertFunction(getName(id, Tys, numTys), + getType(id, Tys, numTys))); } // vim: sw=2 ai