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323 lines
11 KiB
C++
323 lines
11 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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/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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#include <map>
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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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Function *ilist_traits<Function>::createSentinel() {
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FunctionType *FTy =
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FunctionType::get(Type::VoidTy, std::vector<const Type*>(), false);
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Function *Ret = new Function(FTy, 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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GlobalVariable *ilist_traits<GlobalVariable>::createSentinel() {
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GlobalVariable *Ret = new GlobalVariable(Type::Int32Ty, false,
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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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GlobalAlias *ilist_traits<GlobalAlias>::createSentinel() {
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GlobalAlias *Ret = new GlobalAlias(Type::Int32Ty, 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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iplist<Function> &ilist_traits<Function>::getList(Module *M) {
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return M->getFunctionList();
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}
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iplist<GlobalVariable> &ilist_traits<GlobalVariable>::getList(Module *M) {
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return M->getGlobalList();
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}
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iplist<GlobalAlias> &ilist_traits<GlobalAlias>::getList(Module *M) {
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return M->getAliasList();
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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<GlobalVariable, Module>;
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template class SymbolTableListTraits<Function, Module>;
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template class SymbolTableListTraits<GlobalAlias, Module>;
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//===----------------------------------------------------------------------===//
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// Primitive Module methods.
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//
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Module::Module(const std::string &MID)
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: ModuleID(MID), DataLayout("") {
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ValSymTab = new ValueSymbolTable();
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TypeSymTab = new TypeSymbolTable();
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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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delete ValSymTab;
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delete TypeSymTab;
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}
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// Module::dump() - Allow printing from debugger
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void Module::dump() const {
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print(*cerr.stream());
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}
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/// Target endian information...
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Module::Endianness Module::getEndianness() const {
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std::string temp = DataLayout;
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Module::Endianness ret = AnyEndianness;
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while (!temp.empty()) {
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std::string token = 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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std::string temp = DataLayout;
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Module::PointerSize ret = AnyPointerSize;
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while (!temp.empty()) {
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std::string token = getToken(temp, "-");
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char signal = getToken(token, ":")[0];
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if (signal == 'p') {
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int size = atoi(getToken(token, ":").c_str());
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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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//===----------------------------------------------------------------------===//
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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(const std::string &Name,
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const FunctionType *Ty) {
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ValueSymbolTable &SymTab = getValueSymbolTable();
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// See if we have a definition for the specified function already.
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GlobalValue *F = dyn_cast_or_null<GlobalValue>(SymTab.lookup(Name));
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if (F == 0) {
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// Nope, add it
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Function *New = new Function(Ty, GlobalVariable::ExternalLinkage, Name);
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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->hasInternalLinkage()) {
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// Rename the function.
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F->setName(SymTab.getUniqueName(F->getName()));
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// Retry, now there won't be a conflict.
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return getOrInsertFunction(Name, Ty);
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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::get(Ty))
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return ConstantExpr::getBitCast(F, PointerType::get(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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// 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(const std::string &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, FunctionType::get(RetTy, ArgTys, false));
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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(const std::string &Name) const {
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const ValueSymbolTable &SymTab = getValueSymbolTable();
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return dyn_cast_or_null<Function>(SymTab.lookup(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 AllowInternal is set to true, this function will return types that
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/// have InternalLinkage. By default, these types are not returned.
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///
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GlobalVariable *Module::getGlobalVariable(const std::string &Name,
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bool AllowInternal) const {
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if (Value *V = ValSymTab->lookup(Name)) {
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GlobalVariable *Result = dyn_cast<GlobalVariable>(V);
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if (Result && (AllowInternal || !Result->hasInternalLinkage()))
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return Result;
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}
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return 0;
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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(const std::string &Name) const {
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const ValueSymbolTable &SymTab = getValueSymbolTable();
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return dyn_cast_or_null<GlobalAlias>(SymTab.lookup(Name));
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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(const std::string &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(const std::string &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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// 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(const std::string& 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(const std::string& 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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