1 files changed, 292 insertions, 0 deletions
diff --git a/lib/VMCore/Module.cpp b/lib/VMCore/Module.cpp
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+++ b/lib/VMCore/Module.cpp
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+//===-- Module.cpp - Implement the Module class ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and 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/Support/LeakDetector.h"
+#include "SymbolTableListTraitsImpl.h"
+#include <algorithm>
+#include <cstdarg>
+#include <iostream>
+#include <map>
+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 = new Function(FTy, GlobalValue::ExternalLinkage);
+  // This should not be garbage monitored.
+  LeakDetector::removeGarbageObject(Ret);
+  return Ret;
+}
+GlobalVariable *ilist_traits<GlobalVariable>::createSentinel() {
+  GlobalVariable *Ret = new GlobalVariable(Type::IntTy, false,
+                                           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();
+}
+
+// Explicit instantiations of SymbolTableListTraits since some of the methods
+// are not in the public header file...
+template class SymbolTableListTraits<GlobalVariable, Module, Module>;
+template class SymbolTableListTraits<Function, Module, Module>;
+
+//===----------------------------------------------------------------------===//
+// Primitive Module methods.
+//
+
+Module::Module(const std::string &MID)
+  : ModuleID(MID), Endian(AnyEndianness), PtrSize(AnyPointerSize) {
+  FunctionList.setItemParent(this);
+  FunctionList.setParent(this);
+  GlobalList.setItemParent(this);
+  GlobalList.setParent(this);
+  SymTab = new SymbolTable();
+}
+
+Module::~Module() {
+  dropAllReferences();
+  GlobalList.clear();
+  GlobalList.setParent(0);
+  FunctionList.clear();
+  FunctionList.setParent(0);
+  LibraryList.clear();
+  delete SymTab;
+}
+
+// Module::dump() - Allow printing from debugger
+void Module::dump() const {
+  print(std::cerr);
+}
+
+//===----------------------------------------------------------------------===//
+// 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.
+//
+Function *Module::getOrInsertFunction(const std::string &Name,
+                                      const FunctionType *Ty) {
+  SymbolTable &SymTab = getSymbolTable();
+
+  // See if we have a definitions for the specified function already...
+  if (Value *V = SymTab.lookup(PointerType::get(Ty), Name)) {
+    return cast<Function>(V);      // Yup, got it
+  } else {                         // Nope, add one
+    Function *New = new Function(Ty, GlobalVariable::ExternalLinkage, Name);
+    FunctionList.push_back(New);
+    return New;                    // Return the new prototype...
+  }
+}
+
+// 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.
+//
+Function *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 FunctionType *Ty) {
+  SymbolTable &SymTab = getSymbolTable();
+  return cast_or_null<Function>(SymTab.lookup(PointerType::get(Ty), Name));
+}
+
+
+/// getMainFunction - This function looks up main efficiently.  This is such a
+/// common case, that it is a method in Module.  If main cannot be found, a
+/// null pointer is returned.
+///
+Function *Module::getMainFunction() {
+  std::vector<const Type*> Params;
+
+  // int main(void)...
+  if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+                                                          Params, false)))
+    return F;
+
+  // void main(void)...
+  if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+                                                          Params, false)))
+    return F;
+
+  Params.push_back(Type::IntTy);
+
+  // int main(int argc)...
+  if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+                                                          Params, false)))
+    return F;
+
+  // void main(int argc)...
+  if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+                                                          Params, false)))
+    return F;
+
+  for (unsigned i = 0; i != 2; ++i) {  // Check argv and envp
+    Params.push_back(PointerType::get(PointerType::get(Type::SByteTy)));
+
+    // int main(int argc, char **argv)...
+    if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+                                                            Params, false)))
+      return F;
+
+    // void main(int argc, char **argv)...
+    if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+                                                            Params, false)))
+      return F;
+  }
+
+  // Ok, try to find main the hard way...
+  return getNamedFunction("main");
+}
+
+/// getNamedFunction - Return the first function in the module with the
+/// specified name, of arbitrary type.  This method returns null if a function
+/// with the specified name is not found.
+///
+Function *Module::getNamedFunction(const std::string &Name) {
+  // Loop over all of the functions, looking for the function desired
+  Function *Found = 0;
+  for (iterator I = begin(), E = end(); I != E; ++I)
+    if (I->getName() == Name)
+      if (I->isExternal())
+        Found = I;
+      else
+        return I;
+  return Found; // Non-external function not found...
+}
+
+//===----------------------------------------------------------------------===//
+// 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.  Note that this only
+/// returns a global variable if it does not have internal linkage.  The type
+/// argument should be the underlying type of the global, ie, it should not
+/// have the top-level PointerType, which represents the address of the
+/// global.
+///
+GlobalVariable *Module::getGlobalVariable(const std::string &Name,
+                                          const Type *Ty) {
+  if (Value *V = getSymbolTable().lookup(PointerType::get(Ty), Name)) {
+    GlobalVariable *Result = cast<GlobalVariable>(V);
+    if (!Result->hasInternalLinkage())
+      return Result;
+  }
+  return 0;
+}
+
+
+
+//===----------------------------------------------------------------------===//
+// 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) {
+  SymbolTable &ST = getSymbolTable();
+
+  if (ST.lookupType(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 SymbolTable &ST = getSymbolTable();
+  return cast_or_null<Type>(ST.lookupType(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 SymbolTable &ST = getSymbolTable();
+
+  SymbolTable::type_const_iterator TI = ST.type_begin();
+  SymbolTable::type_const_iterator TE = ST.type_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();
+}
+