//===- lib/Linker/LinkArchives.cpp - Link LLVM objects and libraries ------===//
-//
+//
// 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 contains routines to handle linking together LLVM bytecode files,
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/Archive.h"
#include "llvm/Config/config.h"
-//#include "llvm/Support/SystemUtils.h"
-//#include <algorithm>
-//#include <memory>
+#include <memory>
#include <set>
-#include <iostream>
-
using namespace llvm;
/// GetAllDefinedSymbols - Modifies its parameter DefinedSymbols to contain the
/// name of each externally-visible symbol defined in M.
///
-static void
+static void
GetAllDefinedSymbols(Module *M, std::set<std::string> &DefinedSymbols) {
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
if (I->hasName() && !I->isExternal() && !I->hasInternalLinkage())
DefinedSymbols.insert(I->getName());
- for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
+ for (Module::global_iterator I = M->global_begin(), E = M->global_end();
+ I != E; ++I)
if (I->hasName() && !I->isExternal() && !I->hasInternalLinkage())
DefinedSymbols.insert(I->getName());
}
GetAllUndefinedSymbols(Module *M, std::set<std::string> &UndefinedSymbols) {
std::set<std::string> DefinedSymbols;
UndefinedSymbols.clear();
-
+
+ // If the program doesn't define a main, try pulling one in from a .a file.
+ // This is needed for programs where the main function is defined in an
+ // archive, such f2c'd programs.
+ Function *Main = M->getMainFunction();
+ if (Main == 0 || Main->isExternal())
+ UndefinedSymbols.insert("main");
+
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
if (I->hasName()) {
if (I->isExternal())
else if (!I->hasInternalLinkage())
DefinedSymbols.insert(I->getName());
}
- for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
+ for (Module::global_iterator I = M->global_begin(), E = M->global_end();
+ I != E; ++I)
if (I->hasName()) {
if (I->isExternal())
UndefinedSymbols.insert(I->getName());
else if (!I->hasInternalLinkage())
DefinedSymbols.insert(I->getName());
}
-
+
// Prune out any defined symbols from the undefined symbols set...
for (std::set<std::string>::iterator I = UndefinedSymbols.begin();
I != UndefinedSymbols.end(); )
/// Return Value:
/// TRUE - An error occurred.
/// FALSE - No errors.
-bool
+bool
Linker::LinkInArchive(const sys::Path &Filename) {
// Make sure this is an archive file we're dealing with
// no reason to link in any archive files.
std::set<std::string> UndefinedSymbols;
GetAllUndefinedSymbols(Composite, UndefinedSymbols);
-
+
if (UndefinedSymbols.empty()) {
- verbose("No symbols undefined, skipping library '" +
+ verbose("No symbols undefined, skipping library '" +
Filename.toString() + "'");
return false; // No need to link anything in!
}
Archive* arch = AutoArch.get();
if (!arch)
- return error("Cannot read archive '" + Filename.toString() +
+ return error("Cannot read archive '" + Filename.toString() +
"': " + ErrMsg);
// Save a set of symbols that are not defined by the archive. Since we're
std::set<std::string> NotDefinedByArchive;
// While we are linking in object files, loop.
- while (true) {
+ while (true) {
// Find the modules we need to link into the target module
std::set<ModuleProvider*> Modules;
arch->findModulesDefiningSymbols(UndefinedSymbols, Modules);
- // If we didn't find any more modules to link this time, we are done
+ // If we didn't find any more modules to link this time, we are done
// searching this archive.
if (Modules.empty())
break;
std::auto_ptr<Module> AutoModule( (*I)->releaseModule() );
Module* aModule = AutoModule.get();
+ verbose(" Linking in module: " + aModule->getModuleIdentifier());
+
// Link it in
- if (this->LinkInModule(aModule))
- return error("Cannot link in module '" +
+ if (LinkInModule(aModule))
+ return error("Cannot link in module '" +
aModule->getModuleIdentifier() + "': " + Error);
}
GetAllUndefinedSymbols(Composite, UndefinedSymbols);
// At this point we have two sets of undefined symbols: UndefinedSymbols
- // which holds the undefined symbols from all the modules, and
+ // which holds the undefined symbols from all the modules, and
// NotDefinedByArchive which holds symbols we know the archive doesn't
// define. There's no point searching for symbols that we won't find in the
// archive so we subtract these sets.
- set_subtract<std::set<std::string>,std::set<std::string> >(
- UndefinedSymbols,NotDefinedByArchive);
-
+ set_subtract(UndefinedSymbols, NotDefinedByArchive);
+
// If there's no symbols left, no point in continuing to search the
// archive.
if (UndefinedSymbols.empty())
break;
}
-
+
return false;
}