1 //===-- Function.cpp - Implement the Global object classes ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Function class for the VMCore library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Module.h"
15 #include "llvm/DerivedTypes.h"
16 #include "llvm/ParameterAttributes.h"
17 #include "llvm/IntrinsicInst.h"
18 #include "llvm/Support/LeakDetector.h"
19 #include "llvm/Support/ManagedStatic.h"
20 #include "SymbolTableListTraitsImpl.h"
21 #include "llvm/ADT/StringExtras.h"
24 BasicBlock *ilist_traits<BasicBlock>::createSentinel() {
25 BasicBlock *Ret = new BasicBlock();
26 // This should not be garbage monitored.
27 LeakDetector::removeGarbageObject(Ret);
31 iplist<BasicBlock> &ilist_traits<BasicBlock>::getList(Function *F) {
32 return F->getBasicBlockList();
35 Argument *ilist_traits<Argument>::createSentinel() {
36 Argument *Ret = new Argument(Type::Int32Ty);
37 // This should not be garbage monitored.
38 LeakDetector::removeGarbageObject(Ret);
42 iplist<Argument> &ilist_traits<Argument>::getList(Function *F) {
43 return F->getArgumentList();
46 // Explicit instantiations of SymbolTableListTraits since some of the methods
47 // are not in the public header file...
48 template class SymbolTableListTraits<Argument, Function>;
49 template class SymbolTableListTraits<BasicBlock, Function>;
51 //===----------------------------------------------------------------------===//
52 // Argument Implementation
53 //===----------------------------------------------------------------------===//
55 Argument::Argument(const Type *Ty, const std::string &Name, Function *Par)
56 : Value(Ty, Value::ArgumentVal) {
59 // Make sure that we get added to a function
60 LeakDetector::addGarbageObject(this);
63 Par->getArgumentList().push_back(this);
67 void Argument::setParent(Function *parent) {
69 LeakDetector::addGarbageObject(this);
72 LeakDetector::removeGarbageObject(this);
75 //===----------------------------------------------------------------------===//
76 // ParamAttrsList Implementation
77 //===----------------------------------------------------------------------===//
80 ParamAttrsList::getParamAttrs(uint16_t Index) const {
81 unsigned limit = attrs.size();
82 for (unsigned i = 0; i < limit; ++i)
83 if (attrs[i].index == Index)
84 return attrs[i].attrs;
85 return ParamAttr::None;
90 ParamAttrsList::getParamAttrsText(uint16_t Attrs) {
92 if (Attrs & ParamAttr::ZExt)
94 if (Attrs & ParamAttr::SExt)
96 if (Attrs & ParamAttr::NoReturn)
97 Result += "noreturn ";
98 if (Attrs & ParamAttr::NoUnwind)
99 Result += "nounwind ";
100 if (Attrs & ParamAttr::InReg)
102 if (Attrs & ParamAttr::NoAlias)
103 Result += "noalias ";
104 if (Attrs & ParamAttr::StructRet)
106 if (Attrs & ParamAttr::ByVal)
108 if (Attrs & ParamAttr::Nest)
114 ParamAttrsList::Profile(FoldingSetNodeID &ID) const {
115 for (unsigned i = 0; i < attrs.size(); ++i) {
116 unsigned val = attrs[i].attrs << 16 | attrs[i].index;
121 static ManagedStatic<FoldingSet<ParamAttrsList> > ParamAttrsLists;
124 ParamAttrsList::get(const ParamAttrsVector &attrVec) {
125 assert(!attrVec.empty() && "Illegal to create empty ParamAttrsList");
126 ParamAttrsList key(attrVec);
130 ParamAttrsList* PAL = ParamAttrsLists->FindNodeOrInsertPos(ID, InsertPos);
132 PAL = new ParamAttrsList(attrVec);
133 ParamAttrsLists->InsertNode(PAL, InsertPos);
138 ParamAttrsList::~ParamAttrsList() {
139 ParamAttrsLists->RemoveNode(this);
142 //===----------------------------------------------------------------------===//
143 // Function Implementation
144 //===----------------------------------------------------------------------===//
146 Function::Function(const FunctionType *Ty, LinkageTypes Linkage,
147 const std::string &name, Module *ParentModule)
148 : GlobalValue(PointerType::get(Ty), Value::FunctionVal, 0, 0, Linkage, name) {
150 SymTab = new ValueSymbolTable();
152 assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy)
153 && "LLVM functions cannot return aggregate values!");
155 // If the function has arguments, mark them as lazily built.
156 if (Ty->getNumParams())
157 SubclassData = 1; // Set the "has lazy arguments" bit.
159 // Make sure that we get added to a function
160 LeakDetector::addGarbageObject(this);
163 ParentModule->getFunctionList().push_back(this);
166 Function::~Function() {
167 dropAllReferences(); // After this it is safe to delete instructions.
169 // Delete all of the method arguments and unlink from symbol table...
170 ArgumentList.clear();
173 // Drop our reference to the parameter attributes, if any.
175 ParamAttrs->dropRef();
178 void Function::BuildLazyArguments() const {
179 // Create the arguments vector, all arguments start out unnamed.
180 const FunctionType *FT = getFunctionType();
181 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
182 assert(FT->getParamType(i) != Type::VoidTy &&
183 "Cannot have void typed arguments!");
184 ArgumentList.push_back(new Argument(FT->getParamType(i)));
187 // Clear the lazy arguments bit.
188 const_cast<Function*>(this)->SubclassData &= ~1;
191 size_t Function::arg_size() const {
192 return getFunctionType()->getNumParams();
194 bool Function::arg_empty() const {
195 return getFunctionType()->getNumParams() == 0;
198 void Function::setParent(Module *parent) {
200 LeakDetector::addGarbageObject(this);
203 LeakDetector::removeGarbageObject(this);
206 void Function::setParamAttrs(ParamAttrsList *attrs) {
208 ParamAttrs->dropRef();
216 const FunctionType *Function::getFunctionType() const {
217 return cast<FunctionType>(getType()->getElementType());
220 bool Function::isVarArg() const {
221 return getFunctionType()->isVarArg();
224 const Type *Function::getReturnType() const {
225 return getFunctionType()->getReturnType();
228 void Function::removeFromParent() {
229 getParent()->getFunctionList().remove(this);
232 void Function::eraseFromParent() {
233 getParent()->getFunctionList().erase(this);
236 // dropAllReferences() - This function causes all the subinstructions to "let
237 // go" of all references that they are maintaining. This allows one to
238 // 'delete' a whole class at a time, even though there may be circular
239 // references... first all references are dropped, and all use counts go to
240 // zero. Then everything is deleted for real. Note that no operations are
241 // valid on an object that has "dropped all references", except operator
244 void Function::dropAllReferences() {
245 for (iterator I = begin(), E = end(); I != E; ++I)
246 I->dropAllReferences();
247 BasicBlocks.clear(); // Delete all basic blocks...
250 /// getIntrinsicID - This method returns the ID number of the specified
251 /// function, or Intrinsic::not_intrinsic if the function is not an
252 /// intrinsic, or if the pointer is null. This value is always defined to be
253 /// zero to allow easy checking for whether a function is intrinsic or not. The
254 /// particular intrinsic functions which correspond to this value are defined in
255 /// llvm/Intrinsics.h.
257 unsigned Function::getIntrinsicID(bool noAssert) const {
258 const ValueName *ValName = this->getValueName();
261 unsigned Len = ValName->getKeyLength();
262 const char *Name = ValName->getKeyData();
264 if (Len < 5 || Name[4] != '.' || Name[0] != 'l' || Name[1] != 'l'
265 || Name[2] != 'v' || Name[3] != 'm')
266 return 0; // All intrinsics start with 'llvm.'
268 assert((Len != 5 || noAssert) && "'llvm.' is an invalid intrinsic name!");
270 #define GET_FUNCTION_RECOGNIZER
271 #include "llvm/Intrinsics.gen"
272 #undef GET_FUNCTION_RECOGNIZER
273 assert(noAssert && "Invalid LLVM intrinsic name");
277 std::string Intrinsic::getName(ID id, const Type **Tys, unsigned numTys) {
278 assert(id < num_intrinsics && "Invalid intrinsic ID!");
279 const char * const Table[] = {
281 #define GET_INTRINSIC_NAME_TABLE
282 #include "llvm/Intrinsics.gen"
283 #undef GET_INTRINSIC_NAME_TABLE
287 std::string Result(Table[id]);
288 for (unsigned i = 0; i < numTys; ++i)
290 Result += "." + Tys[i]->getDescription();
294 const FunctionType *Intrinsic::getType(ID id, const Type **Tys,
296 const Type *ResultTy = NULL;
297 std::vector<const Type*> ArgTys;
298 bool IsVarArg = false;
300 #define GET_INTRINSIC_GENERATOR
301 #include "llvm/Intrinsics.gen"
302 #undef GET_INTRINSIC_GENERATOR
304 return FunctionType::get(ResultTy, ArgTys, IsVarArg);
307 Function *Intrinsic::getDeclaration(Module *M, ID id, const Type **Tys,
309 // There can never be multiple globals with the same name of different types,
310 // because intrinsics must be a specific type.
311 return cast<Function>(M->getOrInsertFunction(getName(id, Tys, numTys),
312 getType(id, Tys, numTys)));
315 Value *IntrinsicInst::StripPointerCasts(Value *Ptr) {
316 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
317 if (CE->getOpcode() == Instruction::BitCast) {
318 if (isa<PointerType>(CE->getOperand(0)->getType()))
319 return StripPointerCasts(CE->getOperand(0));
320 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
321 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
322 if (!CE->getOperand(i)->isNullValue())
324 return StripPointerCasts(CE->getOperand(0));
329 if (BitCastInst *CI = dyn_cast<BitCastInst>(Ptr)) {
330 if (isa<PointerType>(CI->getOperand(0)->getType()))
331 return StripPointerCasts(CI->getOperand(0));
332 } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
333 if (GEP->hasAllZeroIndices())
334 return StripPointerCasts(GEP->getOperand(0));