419 lines
14 KiB
C++
419 lines
14 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 is distributed under the University of Illinois Open Source
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// 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/LLVMContext.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/LeakDetector.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/StringPool.h"
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#include "llvm/System/RWMutex.h"
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#include "llvm/System/Threading.h"
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#include "SymbolTableListTraitsImpl.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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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 llvm::SymbolTableListTraits<Argument, Function>;
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template class llvm::SymbolTableListTraits<BasicBlock, 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 Twine &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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/// getArgNo - Return the index of this formal argument in its containing
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/// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
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unsigned Argument::getArgNo() const {
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const Function *F = getParent();
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assert(F && "Argument is not in a function");
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Function::const_arg_iterator AI = F->arg_begin();
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unsigned ArgIdx = 0;
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for (; &*AI != this; ++AI)
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++ArgIdx;
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return ArgIdx;
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}
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/// hasByValAttr - Return true if this argument has the byval attribute on it
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/// in its containing function.
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bool Argument::hasByValAttr() const {
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if (!getType()->isPointerTy()) return false;
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return getParent()->paramHasAttr(getArgNo()+1, Attribute::ByVal);
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}
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/// hasNestAttr - Return true if this argument has the nest attribute on
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/// it in its containing function.
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bool Argument::hasNestAttr() const {
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if (!getType()->isPointerTy()) return false;
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return getParent()->paramHasAttr(getArgNo()+1, Attribute::Nest);
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}
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/// hasNoAliasAttr - Return true if this argument has the noalias attribute on
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/// it in its containing function.
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bool Argument::hasNoAliasAttr() const {
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if (!getType()->isPointerTy()) return false;
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return getParent()->paramHasAttr(getArgNo()+1, Attribute::NoAlias);
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}
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/// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
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/// on it in its containing function.
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bool Argument::hasNoCaptureAttr() const {
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if (!getType()->isPointerTy()) return false;
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return getParent()->paramHasAttr(getArgNo()+1, Attribute::NoCapture);
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}
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/// hasSRetAttr - Return true if this argument has the sret attribute on
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/// it in its containing function.
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bool Argument::hasStructRetAttr() const {
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if (!getType()->isPointerTy()) return false;
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if (this != getParent()->arg_begin())
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return false; // StructRet param must be first param
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return getParent()->paramHasAttr(1, Attribute::StructRet);
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}
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/// addAttr - Add a Attribute to an argument
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void Argument::addAttr(Attributes attr) {
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getParent()->addAttribute(getArgNo() + 1, attr);
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}
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/// removeAttr - Remove a Attribute from an argument
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void Argument::removeAttr(Attributes attr) {
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getParent()->removeAttribute(getArgNo() + 1, attr);
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}
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//===----------------------------------------------------------------------===//
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// Helper Methods in Function
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//===----------------------------------------------------------------------===//
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LLVMContext &Function::getContext() const {
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return getType()->getContext();
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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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//===----------------------------------------------------------------------===//
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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 Twine &name, Module *ParentModule)
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: GlobalValue(PointerType::getUnqual(Ty),
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Value::FunctionVal, 0, 0, Linkage, name) {
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assert(FunctionType::isValidReturnType(getReturnType()) &&
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!getReturnType()->isOpaqueTy() && "invalid return type");
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SymTab = new ValueSymbolTable();
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// If the function has arguments, mark them as lazily built.
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if (Ty->getNumParams())
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setValueSubclassData(1); // Set the "has lazy arguments" bit.
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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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// Ensure intrinsics have the right parameter attributes.
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if (unsigned IID = getIntrinsicID())
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setAttributes(Intrinsic::getAttributes(Intrinsic::ID(IID)));
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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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delete SymTab;
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// Remove the function from the on-the-side GC table.
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clearGC();
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}
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void Function::BuildLazyArguments() const {
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// Create the arguments vector, all arguments start out unnamed.
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const FunctionType *FT = getFunctionType();
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for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
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assert(!FT->getParamType(i)->isVoidTy() &&
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"Cannot have void typed arguments!");
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ArgumentList.push_back(new Argument(FT->getParamType(i)));
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}
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// Clear the lazy arguments bit.
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unsigned SDC = getSubclassDataFromValue();
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const_cast<Function*>(this)->setValueSubclassData(SDC &= ~1);
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}
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size_t Function::arg_size() const {
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return getFunctionType()->getNumParams();
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}
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bool Function::arg_empty() const {
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return getFunctionType()->getNumParams() == 0;
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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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// 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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// Delete all basic blocks.
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while (!BasicBlocks.empty()) {
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// If there is still a reference to the block, it must be a 'blockaddress'
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// constant pointing to it. Just replace the BlockAddress with undef.
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BasicBlock *BB = BasicBlocks.begin();
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if (!BB->use_empty()) {
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BlockAddress *BA = cast<BlockAddress>(BB->use_back());
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BA->replaceAllUsesWith(UndefValue::get(BA->getType()));
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BA->destroyConstant();
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}
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BB->eraseFromParent();
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}
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}
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void Function::addAttribute(unsigned i, Attributes attr) {
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AttrListPtr PAL = getAttributes();
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PAL = PAL.addAttr(i, attr);
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setAttributes(PAL);
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}
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void Function::removeAttribute(unsigned i, Attributes attr) {
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AttrListPtr PAL = getAttributes();
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PAL = PAL.removeAttr(i, attr);
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setAttributes(PAL);
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}
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// Maintain the GC name for each function in an on-the-side table. This saves
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// allocating an additional word in Function for programs which do not use GC
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// (i.e., most programs) at the cost of increased overhead for clients which do
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// use GC.
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static DenseMap<const Function*,PooledStringPtr> *GCNames;
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static StringPool *GCNamePool;
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static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
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bool Function::hasGC() const {
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sys::SmartScopedReader<true> Reader(*GCLock);
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return GCNames && GCNames->count(this);
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}
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const char *Function::getGC() const {
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assert(hasGC() && "Function has no collector");
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sys::SmartScopedReader<true> Reader(*GCLock);
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return *(*GCNames)[this];
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}
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void Function::setGC(const char *Str) {
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sys::SmartScopedWriter<true> Writer(*GCLock);
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if (!GCNamePool)
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GCNamePool = new StringPool();
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if (!GCNames)
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GCNames = new DenseMap<const Function*,PooledStringPtr>();
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(*GCNames)[this] = GCNamePool->intern(Str);
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}
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void Function::clearGC() {
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sys::SmartScopedWriter<true> Writer(*GCLock);
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if (GCNames) {
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GCNames->erase(this);
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if (GCNames->empty()) {
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delete GCNames;
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GCNames = 0;
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if (GCNamePool->empty()) {
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delete GCNamePool;
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GCNamePool = 0;
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}
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}
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}
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}
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/// copyAttributesFrom - copy all additional attributes (those not needed to
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/// create a Function) from the Function Src to this one.
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void Function::copyAttributesFrom(const GlobalValue *Src) {
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assert(isa<Function>(Src) && "Expected a Function!");
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GlobalValue::copyAttributesFrom(Src);
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const Function *SrcF = cast<Function>(Src);
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setCallingConv(SrcF->getCallingConv());
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setAttributes(SrcF->getAttributes());
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if (SrcF->hasGC())
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setGC(SrcF->getGC());
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else
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clearGC();
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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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if (!ValName)
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return 0;
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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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#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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std::string Intrinsic::getName(ID id, const Type **Tys, unsigned numTys) {
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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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if (numTys == 0)
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return Table[id];
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std::string Result(Table[id]);
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for (unsigned i = 0; i < numTys; ++i) {
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if (const PointerType* PTyp = dyn_cast<PointerType>(Tys[i])) {
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Result += ".p" + llvm::utostr(PTyp->getAddressSpace()) +
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EVT::getEVT(PTyp->getElementType()).getEVTString();
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}
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else if (Tys[i])
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Result += "." + EVT::getEVT(Tys[i]).getEVTString();
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}
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return Result;
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}
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const FunctionType *Intrinsic::getType(LLVMContext &Context,
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ID id, const Type **Tys,
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unsigned numTys) {
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const Type *ResultTy = NULL;
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std::vector<const Type*> ArgTys;
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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);
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}
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bool Intrinsic::isOverloaded(ID id) {
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const bool OTable[] = {
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false,
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#define GET_INTRINSIC_OVERLOAD_TABLE
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#include "llvm/Intrinsics.gen"
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#undef GET_INTRINSIC_OVERLOAD_TABLE
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};
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return OTable[id];
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}
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/// This defines the "Intrinsic::getAttributes(ID id)" method.
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#define GET_INTRINSIC_ATTRIBUTES
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#include "llvm/Intrinsics.gen"
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#undef GET_INTRINSIC_ATTRIBUTES
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Function *Intrinsic::getDeclaration(Module *M, ID id, const Type **Tys,
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unsigned numTys) {
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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
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cast<Function>(M->getOrInsertFunction(getName(id, Tys, numTys),
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getType(M->getContext(),
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id, Tys, numTys)));
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}
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// This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
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#define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
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#include "llvm/Intrinsics.gen"
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#undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
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/// hasAddressTaken - returns true if there are any uses of this function
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/// other than direct calls or invokes to it.
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bool Function::hasAddressTaken(const User* *PutOffender) const {
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for (Value::const_use_iterator I = use_begin(), E = use_end(); I != E; ++I) {
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const User *U = *I;
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if (!isa<CallInst>(U) && !isa<InvokeInst>(U))
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return PutOffender ? (*PutOffender = U, true) : true;
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ImmutableCallSite CS(cast<Instruction>(U));
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if (!CS.isCallee(I))
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return PutOffender ? (*PutOffender = U, true) : true;
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}
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return false;
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}
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// vim: sw=2 ai
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