mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47857 91177308-0d34-0410-b5e6-96231b3b80d8
424 lines
13 KiB
C++
424 lines
13 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/ParamAttrsList.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/Support/LeakDetector.h"
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#include "llvm/Support/StringPool.h"
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#include "SymbolTableListTraitsImpl.h"
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#include "llvm/ADT/BitVector.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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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>;
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template class 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 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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/// 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 (!isa<PointerType>(getType())) return false;
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return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::ByVal);
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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 (!isa<PointerType>(getType())) return false;
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return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::NoAlias);
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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 (!isa<PointerType>(getType())) return false;
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if (this != getParent()->arg_begin()) return false; // StructRet param must be first param
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return getParent()->paramHasAttr(1, ParamAttr::StructRet);
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}
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//===----------------------------------------------------------------------===//
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// Helper Methods in Function
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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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/// @brief Determine whether the function has the given attribute.
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bool Function::paramHasAttr(uint16_t i, ParameterAttributes attr) const {
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return ParamAttrs && ParamAttrs->paramHasAttr(i, attr);
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}
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/// @brief Extract the alignment for a call or parameter (0=unknown).
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uint16_t Function::getParamAlignment(uint16_t i) const {
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return ParamAttrs ? ParamAttrs->getParamAlignment(i) : 0;
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}
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/// @brief Determine if the function cannot return.
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bool Function::doesNotReturn() const {
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return paramHasAttr(0, ParamAttr::NoReturn);
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}
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/// @brief Determine if the function cannot unwind.
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bool Function::doesNotThrow() const {
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return paramHasAttr(0, ParamAttr::NoUnwind);
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}
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/// @brief Determine if the function does not access memory.
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bool Function::doesNotAccessMemory() const {
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return paramHasAttr(0, ParamAttr::ReadNone);
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}
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/// @brief Determine if the function does not access or only reads memory.
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bool Function::onlyReadsMemory() const {
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return doesNotAccessMemory() || paramHasAttr(0, ParamAttr::ReadOnly);
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}
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/// @brief Determine if the function returns a structure through first
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/// pointer argument.
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bool Function::hasStructRetAttr() const {
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return paramHasAttr(1, ParamAttr::StructRet);
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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::getUnqual(Ty),
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Value::FunctionVal, 0, 0, Linkage, name),
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ParamAttrs(0) {
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SymTab = new ValueSymbolTable();
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assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy
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|| isa<StructType>(getReturnType()))
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&& "LLVM functions cannot return aggregate values!");
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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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SubclassData = 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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}
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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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// Drop our reference to the parameter attributes, if any.
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if (ParamAttrs)
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ParamAttrs->dropRef();
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// Remove the function from the on-the-side collector table.
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clearCollector();
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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) != Type::VoidTy &&
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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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const_cast<Function*>(this)->SubclassData &= ~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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void Function::setParamAttrs(const ParamAttrsList *attrs) {
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// Avoid deleting the ParamAttrsList if they are setting the
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// attributes to the same list.
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if (ParamAttrs == attrs)
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return;
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// Drop reference on the old ParamAttrsList
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if (ParamAttrs)
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ParamAttrs->dropRef();
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// Add reference to the new ParamAttrsList
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if (attrs)
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attrs->addRef();
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// Set the new ParamAttrsList.
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ParamAttrs = attrs;
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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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// Maintain the collector name for each function in an on-the-side table. This
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// saves allocating an additional word in Function for programs which do not use
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// GC (i.e., most programs) at the cost of increased overhead for clients which
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// do use GC.
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static DenseMap<const Function*,PooledStringPtr> *CollectorNames;
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static StringPool *CollectorNamePool;
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bool Function::hasCollector() const {
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return CollectorNames && CollectorNames->count(this);
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}
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const char *Function::getCollector() const {
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assert(hasCollector() && "Function has no collector");
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return *(*CollectorNames)[this];
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}
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void Function::setCollector(const char *Str) {
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if (!CollectorNamePool)
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CollectorNamePool = new StringPool();
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if (!CollectorNames)
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CollectorNames = new DenseMap<const Function*,PooledStringPtr>();
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(*CollectorNames)[this] = CollectorNamePool->intern(Str);
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}
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void Function::clearCollector() {
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if (CollectorNames) {
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CollectorNames->erase(this);
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if (CollectorNames->empty()) {
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delete CollectorNames;
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CollectorNames = 0;
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if (CollectorNamePool->empty()) {
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delete CollectorNamePool;
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CollectorNamePool = 0;
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}
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}
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}
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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(bool noAssert) 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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assert((Len != 5 || noAssert) && "'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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assert(noAssert && "Invalid LLVM intrinsic name");
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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 (Tys[i])
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Result += "." + MVT::getValueTypeString(MVT::getValueType(Tys[i]));
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return Result;
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}
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const FunctionType *Intrinsic::getType(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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const ParamAttrsList *Intrinsic::getParamAttrs(ID id) {
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ParamAttrsVector Attrs;
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ParameterAttributes Attr = ParamAttr::None;
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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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// Intrinsics cannot throw exceptions.
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Attr |= ParamAttr::NoUnwind;
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Attrs.push_back(ParamAttrsWithIndex::get(0, Attr));
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return ParamAttrsList::get(Attrs);
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}
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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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Function *F =
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cast<Function>(M->getOrInsertFunction(getName(id, Tys, numTys),
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getType(id, Tys, numTys)));
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F->setParamAttrs(getParamAttrs(id));
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return F;
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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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if (GEP->hasAllZeroIndices())
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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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