llvm-6502/lib/VMCore/Module.cpp
Bill Wendling b7c2c1246f - Add a "getOrInsertGlobal" method to the Module class. This acts similarly to
"getOrInsertFunction" in that it either adds a new declaration of the global
  and returns it, or returns the current one -- optionally casting it to the
  correct type.
- Use the new getOrInsertGlobal in the stack protector code.
- Use "splitBasicBlock" in the stack protector code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58727 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-04 22:51:24 +00:00

347 lines
12 KiB
C++

//===-- Module.cpp - Implement the Module class ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Module class for the VMCore library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/InstrTypes.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/LeakDetector.h"
#include "SymbolTableListTraitsImpl.h"
#include "llvm/TypeSymbolTable.h"
#include <algorithm>
#include <cstdarg>
#include <cstdlib>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Methods to implement the globals and functions lists.
//
Function *ilist_traits<Function>::createSentinel() {
FunctionType *FTy =
FunctionType::get(Type::VoidTy, std::vector<const Type*>(), false);
Function *Ret = Function::Create(FTy, GlobalValue::ExternalLinkage);
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
}
GlobalVariable *ilist_traits<GlobalVariable>::createSentinel() {
GlobalVariable *Ret = new GlobalVariable(Type::Int32Ty, false,
GlobalValue::ExternalLinkage);
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
}
GlobalAlias *ilist_traits<GlobalAlias>::createSentinel() {
GlobalAlias *Ret = new GlobalAlias(Type::Int32Ty,
GlobalValue::ExternalLinkage);
// This should not be garbage monitored.
LeakDetector::removeGarbageObject(Ret);
return Ret;
}
iplist<Function> &ilist_traits<Function>::getList(Module *M) {
return M->getFunctionList();
}
iplist<GlobalVariable> &ilist_traits<GlobalVariable>::getList(Module *M) {
return M->getGlobalList();
}
iplist<GlobalAlias> &ilist_traits<GlobalAlias>::getList(Module *M) {
return M->getAliasList();
}
// Explicit instantiations of SymbolTableListTraits since some of the methods
// are not in the public header file.
template class SymbolTableListTraits<GlobalVariable, Module>;
template class SymbolTableListTraits<Function, Module>;
template class SymbolTableListTraits<GlobalAlias, Module>;
//===----------------------------------------------------------------------===//
// Primitive Module methods.
//
Module::Module(const std::string &MID)
: ModuleID(MID), DataLayout("") {
ValSymTab = new ValueSymbolTable();
TypeSymTab = new TypeSymbolTable();
}
Module::~Module() {
dropAllReferences();
GlobalList.clear();
FunctionList.clear();
AliasList.clear();
LibraryList.clear();
delete ValSymTab;
delete TypeSymTab;
}
/// Target endian information...
Module::Endianness Module::getEndianness() const {
std::string temp = DataLayout;
Module::Endianness ret = AnyEndianness;
while (!temp.empty()) {
std::string token = getToken(temp, "-");
if (token[0] == 'e') {
ret = LittleEndian;
} else if (token[0] == 'E') {
ret = BigEndian;
}
}
return ret;
}
/// Target Pointer Size information...
Module::PointerSize Module::getPointerSize() const {
std::string temp = DataLayout;
Module::PointerSize ret = AnyPointerSize;
while (!temp.empty()) {
std::string token = getToken(temp, "-");
char signal = getToken(token, ":")[0];
if (signal == 'p') {
int size = atoi(getToken(token, ":").c_str());
if (size == 32)
ret = Pointer32;
else if (size == 64)
ret = Pointer64;
}
}
return ret;
}
//===----------------------------------------------------------------------===//
// Methods for easy access to the functions in the module.
//
// getOrInsertFunction - Look up the specified function in the module symbol
// table. If it does not exist, add a prototype for the function and return
// it. This is nice because it allows most passes to get away with not handling
// the symbol table directly for this common task.
//
Constant *Module::getOrInsertFunction(const std::string &Name,
const FunctionType *Ty) {
ValueSymbolTable &SymTab = getValueSymbolTable();
// See if we have a definition for the specified function already.
GlobalValue *F = dyn_cast_or_null<GlobalValue>(SymTab.lookup(Name));
if (F == 0) {
// Nope, add it
Function *New = Function::Create(Ty, GlobalVariable::ExternalLinkage, Name);
FunctionList.push_back(New);
return New; // Return the new prototype.
}
// Okay, the function exists. Does it have externally visible linkage?
if (F->hasInternalLinkage()) {
// Clear the function's name.
F->setName("");
// Retry, now there won't be a conflict.
Constant *NewF = getOrInsertFunction(Name, Ty);
F->setName(&Name[0], Name.size());
return NewF;
}
// If the function exists but has the wrong type, return a bitcast to the
// right type.
if (F->getType() != PointerType::getUnqual(Ty))
return ConstantExpr::getBitCast(F, PointerType::getUnqual(Ty));
// Otherwise, we just found the existing function or a prototype.
return F;
}
// getOrInsertFunction - Look up the specified function in the module symbol
// table. If it does not exist, add a prototype for the function and return it.
// This version of the method takes a null terminated list of function
// arguments, which makes it easier for clients to use.
//
Constant *Module::getOrInsertFunction(const std::string &Name,
const Type *RetTy, ...) {
va_list Args;
va_start(Args, RetTy);
// Build the list of argument types...
std::vector<const Type*> ArgTys;
while (const Type *ArgTy = va_arg(Args, const Type*))
ArgTys.push_back(ArgTy);
va_end(Args);
// Build the function type and chain to the other getOrInsertFunction...
return getOrInsertFunction(Name, FunctionType::get(RetTy, ArgTys, false));
}
// getFunction - Look up the specified function in the module symbol table.
// If it does not exist, return null.
//
Function *Module::getFunction(const std::string &Name) const {
const ValueSymbolTable &SymTab = getValueSymbolTable();
return dyn_cast_or_null<Function>(SymTab.lookup(Name));
}
Function *Module::getFunction(const char *Name) const {
const ValueSymbolTable &SymTab = getValueSymbolTable();
return dyn_cast_or_null<Function>(SymTab.lookup(Name, Name+strlen(Name)));
}
//===----------------------------------------------------------------------===//
// Methods for easy access to the global variables in the module.
//
/// getGlobalVariable - Look up the specified global variable in the module
/// symbol table. If it does not exist, return null. The type argument
/// should be the underlying type of the global, i.e., it should not have
/// the top-level PointerType, which represents the address of the global.
/// If AllowInternal is set to true, this function will return types that
/// have InternalLinkage. By default, these types are not returned.
///
GlobalVariable *Module::getGlobalVariable(const std::string &Name,
bool AllowInternal) const {
if (Value *V = ValSymTab->lookup(Name)) {
GlobalVariable *Result = dyn_cast<GlobalVariable>(V);
if (Result && (AllowInternal || !Result->hasInternalLinkage()))
return Result;
}
return 0;
}
Constant *Module::getOrInsertGlobal(const std::string &Name, const Type *Ty) {
ValueSymbolTable &SymTab = getValueSymbolTable();
// See if we have a definition for the specified global already.
GlobalVariable *GV = dyn_cast_or_null<GlobalVariable>(SymTab.lookup(Name));
if (GV == 0) {
// Nope, add it
GlobalVariable *New =
new GlobalVariable(Ty, false, GlobalVariable::ExternalLinkage, 0, Name);
GlobalList.push_back(New);
return New; // Return the new declaration.
}
// If the variable exists but has the wrong type, return a bitcast to the
// right type.
if (GV->getType() != PointerType::getUnqual(Ty))
return ConstantExpr::getBitCast(GV, PointerType::getUnqual(Ty));
// Otherwise, we just found the existing function or a prototype.
return GV;
}
//===----------------------------------------------------------------------===//
// Methods for easy access to the global variables in the module.
//
// getNamedAlias - Look up the specified global in the module symbol table.
// If it does not exist, return null.
//
GlobalAlias *Module::getNamedAlias(const std::string &Name) const {
const ValueSymbolTable &SymTab = getValueSymbolTable();
return dyn_cast_or_null<GlobalAlias>(SymTab.lookup(Name));
}
//===----------------------------------------------------------------------===//
// Methods for easy access to the types in the module.
//
// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
// there is already an entry for this name, true is returned and the symbol
// table is not modified.
//
bool Module::addTypeName(const std::string &Name, const Type *Ty) {
TypeSymbolTable &ST = getTypeSymbolTable();
if (ST.lookup(Name)) return true; // Already in symtab...
// Not in symbol table? Set the name with the Symtab as an argument so the
// type knows what to update...
ST.insert(Name, Ty);
return false;
}
/// getTypeByName - Return the type with the specified name in this module, or
/// null if there is none by that name.
const Type *Module::getTypeByName(const std::string &Name) const {
const TypeSymbolTable &ST = getTypeSymbolTable();
return cast_or_null<Type>(ST.lookup(Name));
}
// getTypeName - If there is at least one entry in the symbol table for the
// specified type, return it.
//
std::string Module::getTypeName(const Type *Ty) const {
const TypeSymbolTable &ST = getTypeSymbolTable();
TypeSymbolTable::const_iterator TI = ST.begin();
TypeSymbolTable::const_iterator TE = ST.end();
if ( TI == TE ) return ""; // No names for types
while (TI != TE && TI->second != Ty)
++TI;
if (TI != TE) // Must have found an entry!
return TI->first;
return ""; // Must not have found anything...
}
//===----------------------------------------------------------------------===//
// Other module related stuff.
//
// dropAllReferences() - This function causes all the subelementss to "let go"
// of all references that they are maintaining. This allows one to 'delete' a
// whole module at a time, even though there may be circular references... first
// all references are dropped, and all use counts go to zero. Then everything
// is deleted for real. Note that no operations are valid on an object that
// has "dropped all references", except operator delete.
//
void Module::dropAllReferences() {
for(Module::iterator I = begin(), E = end(); I != E; ++I)
I->dropAllReferences();
for(Module::global_iterator I = global_begin(), E = global_end(); I != E; ++I)
I->dropAllReferences();
for(Module::alias_iterator I = alias_begin(), E = alias_end(); I != E; ++I)
I->dropAllReferences();
}
void Module::addLibrary(const std::string& Lib) {
for (Module::lib_iterator I = lib_begin(), E = lib_end(); I != E; ++I)
if (*I == Lib)
return;
LibraryList.push_back(Lib);
}
void Module::removeLibrary(const std::string& Lib) {
LibraryListType::iterator I = LibraryList.begin();
LibraryListType::iterator E = LibraryList.end();
for (;I != E; ++I)
if (*I == Lib) {
LibraryList.erase(I);
return;
}
}