llvm-6502/lib/VMCore/Function.cpp
2005-05-06 20:26:43 +00:00

298 lines
11 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 & GlobalVariable classes for the VMCore
// library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/DerivedTypes.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Support/LeakDetector.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::IntTy);
// 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, Function>;
template class SymbolTableListTraits<BasicBlock, Function, Function>;
//===----------------------------------------------------------------------===//
// Argument Implementation
//===----------------------------------------------------------------------===//
Argument::Argument(const Type *Ty, const std::string &Name, Function *Par)
: Value(Ty, Value::ArgumentVal, Name) {
Parent = 0;
// Make sure that we get added to a function
LeakDetector::addGarbageObject(this);
if (Par)
Par->getArgumentList().push_back(this);
}
void Argument::setParent(Function *parent) {
if (getParent())
LeakDetector::addGarbageObject(this);
Parent = parent;
if (getParent())
LeakDetector::removeGarbageObject(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) {
CallingConvention = 0;
BasicBlocks.setItemParent(this);
BasicBlocks.setParent(this);
ArgumentList.setItemParent(this);
ArgumentList.setParent(this);
SymTab = new SymbolTable();
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();
ArgumentList.setParent(0);
delete SymTab;
}
void Function::setParent(Module *parent) {
if (getParent())
LeakDetector::addGarbageObject(this);
Parent = parent;
if (getParent())
LeakDetector::removeGarbageObject(this);
}
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);
}
/// renameLocalSymbols - This method goes through the Function's symbol table
/// and renames any symbols that conflict with symbols at global scope. This is
/// required before printing out to a textual form, to ensure that there is no
/// ambiguity when parsing.
void Function::renameLocalSymbols() {
SymbolTable &LST = getSymbolTable(); // Local Symtab
SymbolTable &GST = getParent()->getSymbolTable(); // Global Symtab
for (SymbolTable::plane_iterator LPI = LST.plane_begin(), E = LST.plane_end();
LPI != E; ++LPI)
// All global symbols are of pointer type, ignore any non-pointer planes.
if (const PointerType *CurTy = dyn_cast<PointerType>(LPI->first)) {
// Only check if the global plane has any symbols of this type.
SymbolTable::plane_iterator GPI = GST.find(LPI->first);
if (GPI != GST.plane_end()) {
SymbolTable::ValueMap &LVM = LPI->second;
const SymbolTable::ValueMap &GVM = GPI->second;
// Loop over all local symbols, renaming those that are in the global
// symbol table already.
for (SymbolTable::value_iterator VI = LVM.begin(), E = LVM.end();
VI != E;) {
Value *V = VI->second;
const std::string &Name = VI->first;
++VI;
if (GVM.count(Name)) {
static unsigned UniqueNum = 0;
// Find a name that does not conflict!
while (GVM.count(Name + "_" + utostr(++UniqueNum)) ||
LVM.count(Name + "_" + utostr(UniqueNum)))
/* scan for UniqueNum that works */;
V->setName(Name + "_" + utostr(UniqueNum));
}
}
}
}
}
// 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() const {
if (getName().size() < 5 || getName()[4] != '.' || getName()[0] != 'l' ||
getName()[1] != 'l' || getName()[2] != 'v' || getName()[3] != 'm')
return 0; // All intrinsics start with 'llvm.'
assert(getName().size() != 5 && "'llvm.' is an invalid intrinsic name!");
switch (getName()[5]) {
case 'c':
if (getName() == "llvm.ctpop") return Intrinsic::ctpop;
if (getName() == "llvm.cttz") return Intrinsic::cttz;
if (getName() == "llvm.ctlz") return Intrinsic::ctlz;
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 'g':
if (getName() == "llvm.gcwrite") return Intrinsic::gcwrite;
if (getName() == "llvm.gcread") return Intrinsic::gcread;
if (getName() == "llvm.gcroot") return Intrinsic::gcroot;
break;
case 'i':
if (getName() == "llvm.isunordered") return Intrinsic::isunordered;
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 'p':
if (getName() == "llvm.prefetch") return Intrinsic::prefetch;
if (getName() == "llvm.pcmarker") return Intrinsic::pcmarker;
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;
if (getName() == "llvm.sqrt") return Intrinsic::sqrt;
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!");
return 0;
}
Value *IntrinsicInst::StripPointerCasts(Value *Ptr) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
if (CE->getOpcode() == Instruction::Cast) {
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 (CastInst *CI = dyn_cast<CastInst>(Ptr)) {
if (isa<PointerType>(CI->getOperand(0)->getType()))
return StripPointerCasts(CI->getOperand(0));
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
for (unsigned i = 1, e = GEP->getNumOperands(); i != e; ++i)
if (!isa<Constant>(GEP->getOperand(i)) ||
!cast<Constant>(GEP->getOperand(i))->isNullValue())
return Ptr;
return StripPointerCasts(GEP->getOperand(0));
}
return Ptr;
}
// vim: sw=2 ai