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internal linkage. Patch provided by Evan Jones, thanks! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24604 91177308-0d34-0410-b5e6-96231b3b80d8
293 lines
10 KiB
C++
293 lines
10 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/Support/LeakDetector.h"
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#include "SymbolTableListTraitsImpl.h"
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#include <algorithm>
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#include <cstdarg>
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#include <iostream>
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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::IntTy, 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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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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// 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, Module>;
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template class SymbolTableListTraits<Function, Module, 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), Endian(AnyEndianness), PtrSize(AnyPointerSize) {
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FunctionList.setItemParent(this);
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FunctionList.setParent(this);
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GlobalList.setItemParent(this);
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GlobalList.setParent(this);
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SymTab = new SymbolTable();
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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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GlobalList.setParent(0);
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FunctionList.clear();
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FunctionList.setParent(0);
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LibraryList.clear();
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delete SymTab;
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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(std::cerr);
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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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Function *Module::getOrInsertFunction(const std::string &Name,
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const FunctionType *Ty) {
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SymbolTable &SymTab = getSymbolTable();
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// See if we have a definitions for the specified function already...
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if (Value *V = SymTab.lookup(PointerType::get(Ty), Name)) {
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return cast<Function>(V); // Yup, got it
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} else { // Nope, add one
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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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}
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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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Function *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 FunctionType *Ty) {
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SymbolTable &SymTab = getSymbolTable();
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return cast_or_null<Function>(SymTab.lookup(PointerType::get(Ty), Name));
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}
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/// getMainFunction - This function looks up main efficiently. This is such a
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/// common case, that it is a method in Module. If main cannot be found, a
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/// null pointer is returned.
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///
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Function *Module::getMainFunction() {
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std::vector<const Type*> Params;
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// int main(void)...
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if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
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Params, false)))
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return F;
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// void main(void)...
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if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
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Params, false)))
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return F;
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Params.push_back(Type::IntTy);
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// int main(int argc)...
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if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
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Params, false)))
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return F;
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// void main(int argc)...
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if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
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Params, false)))
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return F;
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for (unsigned i = 0; i != 2; ++i) { // Check argv and envp
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Params.push_back(PointerType::get(PointerType::get(Type::SByteTy)));
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// int main(int argc, char **argv)...
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if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
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Params, false)))
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return F;
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// void main(int argc, char **argv)...
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if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
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Params, false)))
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return F;
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}
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// Ok, try to find main the hard way...
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return getNamedFunction("main");
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}
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/// getNamedFunction - Return the first function in the module with the
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/// specified name, of arbitrary type. This method returns null if a function
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/// with the specified name is not found.
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///
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Function *Module::getNamedFunction(const std::string &Name) {
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// Loop over all of the functions, looking for the function desired
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Function *Found = 0;
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for (iterator I = begin(), E = end(); I != E; ++I)
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if (I->getName() == Name)
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if (I->isExternal())
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Found = I;
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else
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return I;
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return Found; // Non-external function not found...
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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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const Type *Ty, bool AllowInternal) {
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if (Value *V = getSymbolTable().lookup(PointerType::get(Ty), Name)) {
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GlobalVariable *Result = cast<GlobalVariable>(V);
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if (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 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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SymbolTable &ST = getSymbolTable();
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if (ST.lookupType(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 SymbolTable &ST = getSymbolTable();
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return cast_or_null<Type>(ST.lookupType(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 SymbolTable &ST = getSymbolTable();
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SymbolTable::type_const_iterator TI = ST.type_begin();
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SymbolTable::type_const_iterator TE = ST.type_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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}
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