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5d0b16f797
which allocates a string. This speeds up instcombine on 447.dealII by 5%. llvm-svn: 34318
237 lines
7.7 KiB
C++
237 lines
7.7 KiB
C++
//===-- Function.cpp - Implement the Global object classes ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Function class for the VMCore library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Support/LeakDetector.h"
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#include "SymbolTableListTraitsImpl.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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BasicBlock *ilist_traits<BasicBlock>::createSentinel() {
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BasicBlock *Ret = new BasicBlock();
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// This should not be garbage monitored.
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LeakDetector::removeGarbageObject(Ret);
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return Ret;
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}
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iplist<BasicBlock> &ilist_traits<BasicBlock>::getList(Function *F) {
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return F->getBasicBlockList();
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}
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Argument *ilist_traits<Argument>::createSentinel() {
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Argument *Ret = new Argument(Type::Int32Ty);
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// This should not be garbage monitored.
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LeakDetector::removeGarbageObject(Ret);
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return Ret;
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}
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iplist<Argument> &ilist_traits<Argument>::getList(Function *F) {
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return F->getArgumentList();
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}
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// Explicit instantiations of SymbolTableListTraits since some of the methods
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// are not in the public header file...
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template class SymbolTableListTraits<Argument, Function, Function>;
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template class SymbolTableListTraits<BasicBlock, Function, Function>;
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//===----------------------------------------------------------------------===//
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// Argument Implementation
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//===----------------------------------------------------------------------===//
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Argument::Argument(const Type *Ty, const std::string &Name, Function *Par)
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: Value(Ty, Value::ArgumentVal) {
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Parent = 0;
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// Make sure that we get added to a function
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LeakDetector::addGarbageObject(this);
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if (Par)
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Par->getArgumentList().push_back(this);
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setName(Name);
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}
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void Argument::setParent(Function *parent) {
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if (getParent())
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LeakDetector::addGarbageObject(this);
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Parent = parent;
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if (getParent())
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LeakDetector::removeGarbageObject(this);
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}
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//===----------------------------------------------------------------------===//
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// Function Implementation
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//===----------------------------------------------------------------------===//
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Function::Function(const FunctionType *Ty, LinkageTypes Linkage,
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const std::string &name, Module *ParentModule)
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: GlobalValue(PointerType::get(Ty), Value::FunctionVal, 0, 0, Linkage, name) {
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CallingConvention = 0;
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BasicBlocks.setItemParent(this);
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BasicBlocks.setParent(this);
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ArgumentList.setItemParent(this);
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ArgumentList.setParent(this);
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SymTab = new ValueSymbolTable();
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assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy)
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&& "LLVM functions cannot return aggregate values!");
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// Create the arguments vector, all arguments start out unnamed.
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for (unsigned i = 0, e = Ty->getNumParams(); i != e; ++i) {
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assert(Ty->getParamType(i) != Type::VoidTy &&
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"Cannot have void typed arguments!");
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ArgumentList.push_back(new Argument(Ty->getParamType(i)));
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}
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// Make sure that we get added to a function
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LeakDetector::addGarbageObject(this);
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if (ParentModule)
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ParentModule->getFunctionList().push_back(this);
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}
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Function::~Function() {
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dropAllReferences(); // After this it is safe to delete instructions.
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// Delete all of the method arguments and unlink from symbol table...
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ArgumentList.clear();
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ArgumentList.setParent(0);
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delete SymTab;
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}
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void Function::setParent(Module *parent) {
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if (getParent())
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LeakDetector::addGarbageObject(this);
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Parent = parent;
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if (getParent())
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LeakDetector::removeGarbageObject(this);
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}
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const FunctionType *Function::getFunctionType() const {
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return cast<FunctionType>(getType()->getElementType());
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}
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bool Function::isVarArg() const {
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return getFunctionType()->isVarArg();
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}
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const Type *Function::getReturnType() const {
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return getFunctionType()->getReturnType();
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}
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void Function::removeFromParent() {
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getParent()->getFunctionList().remove(this);
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}
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void Function::eraseFromParent() {
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getParent()->getFunctionList().erase(this);
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}
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// dropAllReferences() - This function causes all the subinstructions to "let
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// go" of all references that they are maintaining. This allows one to
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// 'delete' a whole class at a time, even though there may be circular
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// references... first all references are dropped, and all use counts go to
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// zero. Then everything is deleted for real. Note that no operations are
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// valid on an object that has "dropped all references", except operator
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// delete.
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//
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void Function::dropAllReferences() {
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for (iterator I = begin(), E = end(); I != E; ++I)
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I->dropAllReferences();
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BasicBlocks.clear(); // Delete all basic blocks...
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}
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/// getIntrinsicID - This method returns the ID number of the specified
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/// function, or Intrinsic::not_intrinsic if the function is not an
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/// intrinsic, or if the pointer is null. This value is always defined to be
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/// zero to allow easy checking for whether a function is intrinsic or not. The
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/// particular intrinsic functions which correspond to this value are defined in
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/// llvm/Intrinsics.h.
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///
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unsigned Function::getIntrinsicID() const {
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const ValueName *ValName = this->getValueName();
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unsigned Len = ValName->getKeyLength();
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const char *Name = ValName->getKeyData();
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if (Len < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
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|| Name[2] != 'v' || Name[3] != 'm')
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return 0; // All intrinsics start with 'llvm.'
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assert(Len != 5 && "'llvm.' is an invalid intrinsic name!");
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#define GET_FUNCTION_RECOGNIZER
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#include "llvm/Intrinsics.gen"
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#undef GET_FUNCTION_RECOGNIZER
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return 0;
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}
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const char *Intrinsic::getName(ID id) {
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assert(id < num_intrinsics && "Invalid intrinsic ID!");
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const char * const Table[] = {
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"not_intrinsic",
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#define GET_INTRINSIC_NAME_TABLE
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#include "llvm/Intrinsics.gen"
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#undef GET_INTRINSIC_NAME_TABLE
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};
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return Table[id];
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}
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const FunctionType *Intrinsic::getType(ID id) {
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const Type *ResultTy = NULL;
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std::vector<const Type*> ArgTys;
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std::vector<FunctionType::ParameterAttributes> Attrs;
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bool IsVarArg = false;
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#define GET_INTRINSIC_GENERATOR
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#include "llvm/Intrinsics.gen"
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#undef GET_INTRINSIC_GENERATOR
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return FunctionType::get(ResultTy, ArgTys, IsVarArg, Attrs);
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}
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Function *Intrinsic::getDeclaration(Module *M, ID id) {
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// There can never be multiple globals with the same name of different types,
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// because intrinsics must be a specific type.
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return cast<Function>(M->getOrInsertFunction(getName(id), getType(id)));
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}
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Value *IntrinsicInst::StripPointerCasts(Value *Ptr) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
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if (CE->getOpcode() == Instruction::BitCast) {
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if (isa<PointerType>(CE->getOperand(0)->getType()))
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return StripPointerCasts(CE->getOperand(0));
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} else if (CE->getOpcode() == Instruction::GetElementPtr) {
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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if (!CE->getOperand(i)->isNullValue())
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return Ptr;
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return StripPointerCasts(CE->getOperand(0));
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}
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return Ptr;
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}
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if (BitCastInst *CI = dyn_cast<BitCastInst>(Ptr)) {
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if (isa<PointerType>(CI->getOperand(0)->getType()))
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return StripPointerCasts(CI->getOperand(0));
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} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
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for (unsigned i = 1, e = GEP->getNumOperands(); i != e; ++i)
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if (!isa<Constant>(GEP->getOperand(i)) ||
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!cast<Constant>(GEP->getOperand(i))->isNullValue())
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return Ptr;
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return StripPointerCasts(GEP->getOperand(0));
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}
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return Ptr;
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}
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// vim: sw=2 ai
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