llvm-6502/lib/VMCore/Function.cpp
Duncan Sands 36397f5034 Support for trampolines, except for X86 codegen which is
still under discussion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40549 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-27 12:58:54 +00:00

323 lines
10 KiB
C++

//===-- 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 class for the VMCore library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ParameterAttributes.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Support/LeakDetector.h"
#include "llvm/Support/ManagedStatic.h"
#include "SymbolTableListTraitsImpl.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
BasicBlock *ilist_traits<BasicBlock>::createSentinel() {
BasicBlock *Ret = new BasicBlock();
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
}
iplist<BasicBlock> &ilist_traits<BasicBlock>::getList(Function *F) {
return F->getBasicBlockList();
}
Argument *ilist_traits<Argument>::createSentinel() {
Argument *Ret = new Argument(Type::Int32Ty);
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
}
iplist<Argument> &ilist_traits<Argument>::getList(Function *F) {
return F->getArgumentList();
}
// Explicit instantiations of SymbolTableListTraits since some of the methods
// are not in the public header file...
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) {
Parent = 0;
// Make sure that we get added to a function
LeakDetector::addGarbageObject(this);
if (Par)
Par->getArgumentList().push_back(this);
setName(Name);
}
void Argument::setParent(Function *parent) {
if (getParent())
LeakDetector::addGarbageObject(this);
Parent = parent;
if (getParent())
LeakDetector::removeGarbageObject(this);
}
//===----------------------------------------------------------------------===//
// ParamAttrsList Implementation
//===----------------------------------------------------------------------===//
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 ";
return Result;
}
void
ParamAttrsList::Profile(FoldingSetNodeID &ID) const {
for (unsigned i = 0; i < attrs.size(); ++i) {
unsigned val = attrs[i].attrs << 16 | attrs[i].index;
ID.AddInteger(val);
}
}
static ManagedStatic<FoldingSet<ParamAttrsList> > ParamAttrsLists;
ParamAttrsList *
ParamAttrsList::get(const ParamAttrsVector &attrVec) {
assert(!attrVec.empty() && "Illegal to create empty ParamAttrsList");
ParamAttrsList key(attrVec);
FoldingSetNodeID ID;
key.Profile(ID);
void *InsertPos;
ParamAttrsList* PAL = ParamAttrsLists->FindNodeOrInsertPos(ID, InsertPos);
if (!PAL) {
PAL = new ParamAttrsList(attrVec);
ParamAttrsLists->InsertNode(PAL, InsertPos);
}
return PAL;
}
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, 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)));
}
// Make sure that we get added to a function
LeakDetector::addGarbageObject(this);
if (ParentModule)
ParentModule->getFunctionList().push_back(this);
}
Function::~Function() {
dropAllReferences(); // After this it is safe to delete instructions.
// Delete all of the method arguments and unlink from symbol table...
ArgumentList.clear();
delete SymTab;
// Drop our reference to the parameter attributes, if any.
if (ParamAttrs)
ParamAttrs->dropRef();
}
void Function::setParent(Module *parent) {
if (getParent())
LeakDetector::addGarbageObject(this);
Parent = parent;
if (getParent())
LeakDetector::removeGarbageObject(this);
}
void Function::setParamAttrs(ParamAttrsList *attrs) {
if (ParamAttrs)
ParamAttrs->dropRef();
if (attrs)
attrs->addRef();
ParamAttrs = attrs;
}
const FunctionType *Function::getFunctionType() const {
return cast<FunctionType>(getType()->getElementType());
}
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
// delete.
//
void Function::dropAllReferences() {
for (iterator I = begin(), E = end(); I != E; ++I)
I->dropAllReferences();
BasicBlocks.clear(); // Delete all basic blocks...
}
/// 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
/// zero to allow easy checking for whether a function is intrinsic or not. The
/// particular intrinsic functions which correspond to this value are defined in
/// llvm/Intrinsics.h.
///
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((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 += "." + Tys[i]->getDescription();
return Result;
}
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);
}
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<Function>(M->getOrInsertFunction(getName(id, Tys, numTys),
getType(id, Tys, numTys)));
}
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