forked from OSchip/llvm-project
472 lines
16 KiB
C++
472 lines
16 KiB
C++
//===-- Module.cpp - Implement the Module class ---------------------------===//
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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 Module 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/InstrTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/GVMaterializer.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/LeakDetector.h"
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#include "SymbolTableListTraitsImpl.h"
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#include "llvm/TypeSymbolTable.h"
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#include <algorithm>
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#include <cstdarg>
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#include <cstdlib>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Methods to implement the globals and functions lists.
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//
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GlobalVariable *ilist_traits<GlobalVariable>::createSentinel() {
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GlobalVariable *Ret = new GlobalVariable(Type::getInt32Ty(getGlobalContext()),
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false, GlobalValue::ExternalLinkage);
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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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GlobalAlias *ilist_traits<GlobalAlias>::createSentinel() {
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GlobalAlias *Ret = new GlobalAlias(Type::getInt32Ty(getGlobalContext()),
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GlobalValue::ExternalLinkage);
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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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// 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<GlobalVariable, Module>;
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template class llvm::SymbolTableListTraits<Function, Module>;
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template class llvm::SymbolTableListTraits<GlobalAlias, Module>;
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//===----------------------------------------------------------------------===//
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// Primitive Module methods.
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//
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Module::Module(StringRef MID, LLVMContext& C)
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: Context(C), Materializer(NULL), ModuleID(MID), DataLayout("") {
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ValSymTab = new ValueSymbolTable();
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TypeSymTab = new TypeSymbolTable();
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NamedMDSymTab = new StringMap<NamedMDNode *>();
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}
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Module::~Module() {
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dropAllReferences();
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GlobalList.clear();
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FunctionList.clear();
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AliasList.clear();
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LibraryList.clear();
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NamedMDList.clear();
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delete ValSymTab;
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delete TypeSymTab;
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delete static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab);
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}
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/// Target endian information...
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Module::Endianness Module::getEndianness() const {
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StringRef temp = DataLayout;
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Module::Endianness ret = AnyEndianness;
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while (!temp.empty()) {
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StringRef token = DataLayout;
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tie(token, temp) = getToken(temp, "-");
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if (token[0] == 'e') {
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ret = LittleEndian;
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} else if (token[0] == 'E') {
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ret = BigEndian;
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}
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}
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return ret;
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}
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/// Target Pointer Size information...
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Module::PointerSize Module::getPointerSize() const {
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StringRef temp = DataLayout;
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Module::PointerSize ret = AnyPointerSize;
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while (!temp.empty()) {
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StringRef token, signalToken;
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tie(token, temp) = getToken(temp, "-");
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tie(signalToken, token) = getToken(token, ":");
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if (signalToken[0] == 'p') {
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int size = 0;
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getToken(token, ":").first.getAsInteger(10, size);
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if (size == 32)
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ret = Pointer32;
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else if (size == 64)
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ret = Pointer64;
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}
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}
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return ret;
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}
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/// getNamedValue - Return the first global value in the module with
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/// the specified name, of arbitrary type. This method returns null
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/// if a global with the specified name is not found.
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GlobalValue *Module::getNamedValue(StringRef Name) const {
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return cast_or_null<GlobalValue>(getValueSymbolTable().lookup(Name));
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}
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/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
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/// This ID is uniqued across modules in the current LLVMContext.
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unsigned Module::getMDKindID(StringRef Name) const {
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return Context.getMDKindID(Name);
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}
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/// getMDKindNames - Populate client supplied SmallVector with the name for
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/// custom metadata IDs registered in this LLVMContext. ID #0 is not used,
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/// so it is filled in as an empty string.
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void Module::getMDKindNames(SmallVectorImpl<StringRef> &Result) const {
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return Context.getMDKindNames(Result);
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the functions in the module.
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//
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// getOrInsertFunction - Look up the specified function in the module symbol
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// table. If it does not exist, add a prototype for the function and return
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// it. This is nice because it allows most passes to get away with not handling
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// the symbol table directly for this common task.
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//
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Constant *Module::getOrInsertFunction(StringRef Name,
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const FunctionType *Ty,
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AttrListPtr AttributeList) {
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// See if we have a definition for the specified function already.
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GlobalValue *F = getNamedValue(Name);
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if (F == 0) {
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// Nope, add it
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Function *New = Function::Create(Ty, GlobalVariable::ExternalLinkage, Name);
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if (!New->isIntrinsic()) // Intrinsics get attrs set on construction
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New->setAttributes(AttributeList);
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FunctionList.push_back(New);
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return New; // Return the new prototype.
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}
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// Okay, the function exists. Does it have externally visible linkage?
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if (F->hasLocalLinkage()) {
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// Clear the function's name.
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F->setName("");
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// Retry, now there won't be a conflict.
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Constant *NewF = getOrInsertFunction(Name, Ty);
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F->setName(Name);
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return NewF;
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}
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// If the function exists but has the wrong type, return a bitcast to the
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// right type.
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if (F->getType() != PointerType::getUnqual(Ty))
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return ConstantExpr::getBitCast(F, PointerType::getUnqual(Ty));
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// Otherwise, we just found the existing function or a prototype.
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return F;
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}
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Constant *Module::getOrInsertTargetIntrinsic(StringRef Name,
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const FunctionType *Ty,
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AttrListPtr AttributeList) {
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// See if we have a definition for the specified function already.
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GlobalValue *F = getNamedValue(Name);
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if (F == 0) {
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// Nope, add it
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Function *New = Function::Create(Ty, GlobalVariable::ExternalLinkage, Name);
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New->setAttributes(AttributeList);
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FunctionList.push_back(New);
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return New; // Return the new prototype.
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}
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// Otherwise, we just found the existing function or a prototype.
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return F;
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}
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Constant *Module::getOrInsertFunction(StringRef Name,
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const FunctionType *Ty) {
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AttrListPtr AttributeList = AttrListPtr::get((AttributeWithIndex *)0, 0);
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return getOrInsertFunction(Name, Ty, AttributeList);
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}
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// getOrInsertFunction - Look up the specified function in the module symbol
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// table. If it does not exist, add a prototype for the function and return it.
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// This version of the method takes a null terminated list of function
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// arguments, which makes it easier for clients to use.
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//
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Constant *Module::getOrInsertFunction(StringRef Name,
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AttrListPtr AttributeList,
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const Type *RetTy, ...) {
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va_list Args;
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va_start(Args, RetTy);
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// Build the list of argument types...
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std::vector<const Type*> ArgTys;
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while (const Type *ArgTy = va_arg(Args, const Type*))
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ArgTys.push_back(ArgTy);
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va_end(Args);
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// Build the function type and chain to the other getOrInsertFunction...
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return getOrInsertFunction(Name,
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FunctionType::get(RetTy, ArgTys, false),
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AttributeList);
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}
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Constant *Module::getOrInsertFunction(StringRef Name,
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const Type *RetTy, ...) {
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va_list Args;
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va_start(Args, RetTy);
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// Build the list of argument types...
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std::vector<const Type*> ArgTys;
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while (const Type *ArgTy = va_arg(Args, const Type*))
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ArgTys.push_back(ArgTy);
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va_end(Args);
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// Build the function type and chain to the other getOrInsertFunction...
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return getOrInsertFunction(Name,
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FunctionType::get(RetTy, ArgTys, false),
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AttrListPtr::get((AttributeWithIndex *)0, 0));
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}
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// getFunction - Look up the specified function in the module symbol table.
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// If it does not exist, return null.
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//
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Function *Module::getFunction(StringRef Name) const {
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return dyn_cast_or_null<Function>(getNamedValue(Name));
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the global variables in the module.
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//
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/// getGlobalVariable - Look up the specified global variable in the module
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/// symbol table. If it does not exist, return null. The type argument
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/// should be the underlying type of the global, i.e., it should not have
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/// the top-level PointerType, which represents the address of the global.
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/// If AllowLocal is set to true, this function will return types that
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/// have an local. By default, these types are not returned.
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///
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GlobalVariable *Module::getGlobalVariable(StringRef Name,
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bool AllowLocal) const {
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if (GlobalVariable *Result =
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dyn_cast_or_null<GlobalVariable>(getNamedValue(Name)))
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if (AllowLocal || !Result->hasLocalLinkage())
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return Result;
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return 0;
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}
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/// getOrInsertGlobal - Look up the specified global in the module symbol table.
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/// 1. If it does not exist, add a declaration of the global and return it.
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/// 2. Else, the global exists but has the wrong type: return the function
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/// with a constantexpr cast to the right type.
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/// 3. Finally, if the existing global is the correct delclaration, return the
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/// existing global.
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Constant *Module::getOrInsertGlobal(StringRef Name, const Type *Ty) {
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// See if we have a definition for the specified global already.
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GlobalVariable *GV = dyn_cast_or_null<GlobalVariable>(getNamedValue(Name));
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if (GV == 0) {
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// Nope, add it
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GlobalVariable *New =
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new GlobalVariable(*this, Ty, false, GlobalVariable::ExternalLinkage,
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0, Name);
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return New; // Return the new declaration.
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}
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// If the variable exists but has the wrong type, return a bitcast to the
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// right type.
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if (GV->getType() != PointerType::getUnqual(Ty))
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return ConstantExpr::getBitCast(GV, PointerType::getUnqual(Ty));
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// Otherwise, we just found the existing function or a prototype.
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return GV;
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the global variables in the module.
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//
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// getNamedAlias - Look up the specified global in the module symbol table.
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// If it does not exist, return null.
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//
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GlobalAlias *Module::getNamedAlias(StringRef Name) const {
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return dyn_cast_or_null<GlobalAlias>(getNamedValue(Name));
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}
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/// getNamedMetadata - Return the first NamedMDNode in the module with the
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/// specified name. This method returns null if a NamedMDNode with the
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/// specified name is not found.
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NamedMDNode *Module::getNamedMetadata(const Twine &Name) const {
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SmallString<256> NameData;
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StringRef NameRef = Name.toStringRef(NameData);
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return static_cast<StringMap<NamedMDNode*> *>(NamedMDSymTab)->lookup(NameRef);
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}
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/// getOrInsertNamedMetadata - Return the first named MDNode in the module
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/// with the specified name. This method returns a new NamedMDNode if a
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/// NamedMDNode with the specified name is not found.
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NamedMDNode *Module::getOrInsertNamedMetadata(StringRef Name) {
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NamedMDNode *&NMD =
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(*static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab))[Name];
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if (!NMD) {
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NMD = new NamedMDNode(Name);
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NMD->setParent(this);
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NamedMDList.push_back(NMD);
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}
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return NMD;
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}
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void Module::eraseNamedMetadata(NamedMDNode *NMD) {
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static_cast<StringMap<NamedMDNode *> *>(NamedMDSymTab)->erase(NMD->getName());
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NamedMDList.erase(NMD);
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}
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//===----------------------------------------------------------------------===//
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// Methods for easy access to the types in the module.
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//
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// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
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// there is already an entry for this name, true is returned and the symbol
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// table is not modified.
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//
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bool Module::addTypeName(StringRef Name, const Type *Ty) {
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TypeSymbolTable &ST = getTypeSymbolTable();
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if (ST.lookup(Name)) return true; // Already in symtab...
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// Not in symbol table? Set the name with the Symtab as an argument so the
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// type knows what to update...
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ST.insert(Name, Ty);
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return false;
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}
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/// getTypeByName - Return the type with the specified name in this module, or
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/// null if there is none by that name.
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const Type *Module::getTypeByName(StringRef Name) const {
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const TypeSymbolTable &ST = getTypeSymbolTable();
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return cast_or_null<Type>(ST.lookup(Name));
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}
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// getTypeName - If there is at least one entry in the symbol table for the
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// specified type, return it.
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//
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std::string Module::getTypeName(const Type *Ty) const {
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const TypeSymbolTable &ST = getTypeSymbolTable();
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TypeSymbolTable::const_iterator TI = ST.begin();
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TypeSymbolTable::const_iterator TE = ST.end();
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if ( TI == TE ) return ""; // No names for types
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while (TI != TE && TI->second != Ty)
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++TI;
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if (TI != TE) // Must have found an entry!
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return TI->first;
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return ""; // Must not have found anything...
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}
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//===----------------------------------------------------------------------===//
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// Methods to control the materialization of GlobalValues in the Module.
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//
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void Module::setMaterializer(GVMaterializer *GVM) {
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assert(!Materializer &&
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"Module already has a GVMaterializer. Call MaterializeAllPermanently"
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" to clear it out before setting another one.");
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Materializer.reset(GVM);
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}
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bool Module::isMaterializable(const GlobalValue *GV) const {
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if (Materializer)
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return Materializer->isMaterializable(GV);
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return false;
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}
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bool Module::isDematerializable(const GlobalValue *GV) const {
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if (Materializer)
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return Materializer->isDematerializable(GV);
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return false;
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}
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bool Module::Materialize(GlobalValue *GV, std::string *ErrInfo) {
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if (Materializer)
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return Materializer->Materialize(GV, ErrInfo);
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return false;
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}
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void Module::Dematerialize(GlobalValue *GV) {
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if (Materializer)
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return Materializer->Dematerialize(GV);
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}
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bool Module::MaterializeAll(std::string *ErrInfo) {
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if (!Materializer)
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return false;
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return Materializer->MaterializeModule(this, ErrInfo);
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}
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bool Module::MaterializeAllPermanently(std::string *ErrInfo) {
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if (MaterializeAll(ErrInfo))
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return true;
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Materializer.reset();
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return false;
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}
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//===----------------------------------------------------------------------===//
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// Other module related stuff.
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//
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// dropAllReferences() - This function causes all the subelementss to "let go"
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// of all references that they are maintaining. This allows one to 'delete' a
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// whole module at a time, even though there may be circular references... first
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// all references are dropped, and all use counts go to zero. Then everything
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// is deleted for real. Note that no operations are valid on an object that
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// has "dropped all references", except operator delete.
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//
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void Module::dropAllReferences() {
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for(Module::iterator I = begin(), E = end(); I != E; ++I)
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I->dropAllReferences();
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for(Module::global_iterator I = global_begin(), E = global_end(); I != E; ++I)
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I->dropAllReferences();
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for(Module::alias_iterator I = alias_begin(), E = alias_end(); I != E; ++I)
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I->dropAllReferences();
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}
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void Module::addLibrary(StringRef Lib) {
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for (Module::lib_iterator I = lib_begin(), E = lib_end(); I != E; ++I)
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if (*I == Lib)
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return;
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LibraryList.push_back(Lib);
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}
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void Module::removeLibrary(StringRef Lib) {
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LibraryListType::iterator I = LibraryList.begin();
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LibraryListType::iterator E = LibraryList.end();
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for (;I != E; ++I)
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if (*I == Lib) {
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LibraryList.erase(I);
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return;
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}
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}
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