Moved to lib/Linker (common with gccld)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17791 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 401 deletions

diff --git a/tools/llvm-ld/Linker.cpp b/tools/llvm-ld/Linker.cpp
deleted file mode 100644
index af2c0546f3..0000000000
--- a/tools/llvm-ld/Linker.cpp
+++ /dev/null
@@ -1,401 +0,0 @@
-//===- Linker.cpp - Link together 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,
-// and to handle annoying things like static libraries.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm-ld.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/Bytecode/Reader.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Support/Linker.h"
-#include "llvm/Config/config.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/System/Signals.h"
-#include "llvm/System/Path.h"
-#include "llvm/Support/SystemUtils.h"
-#include <algorithm>
-#include <fstream>
-#include <memory>
-#include <set>
-using namespace llvm;
-
-/// FindLib - Try to convert Filename into the name of a file that we can open,
-/// if it does not already name a file we can open, by first trying to open
-/// Filename, then libFilename.[suffix] for each of a set of several common
-/// library suffixes, in each of the directories in Paths and the directory
-/// named by the value of the environment variable LLVM_LIB_SEARCH_PATH. Returns
-/// an empty string if no matching file can be found.
-///
-std::string llvm::FindLib(const std::string &Filename,
-                          const std::vector<std::string> &Paths,
-                          bool SharedObjectOnly) {
-  // Determine if the pathname can be found as it stands.
-  sys::Path FilePath;
-  if (FilePath.setFile(Filename) && FilePath.readable())
-    return Filename;
-
-  // Ask the System Path object to locate the library. This ensures that
-  // the library search is done correctly for a given platform.
-  sys::Path LibPath = sys::Path::GetLibraryPath(Filename,Paths);
-
-  return LibPath.get();
-}
-
-/// GetAllDefinedSymbols - Modifies its parameter DefinedSymbols to contain the
-/// name of each externally-visible symbol defined in M.
-///
-void llvm::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)
-    if (I->hasName() && !I->isExternal() && !I->hasInternalLinkage())
-      DefinedSymbols.insert(I->getName());
-}
-
-/// GetAllUndefinedSymbols - calculates the set of undefined symbols that still
-/// exist in an LLVM module. This is a bit tricky because there may be two
-/// symbols with the same name but different LLVM types that will be resolved to
-/// each other but aren't currently (thus we need to treat it as resolved).
-///
-/// Inputs:
-///  M - The module in which to find undefined symbols.
-///
-/// Outputs:
-///  UndefinedSymbols - A set of C++ strings containing the name of all
-///                     undefined symbols.
-///
-void
-llvm::GetAllUndefinedSymbols(Module *M,
-                             std::set<std::string> &UndefinedSymbols) {
-  std::set<std::string> DefinedSymbols;
-  UndefinedSymbols.clear();   // Start out empty
-  
-  // Add in all the external functions
-  for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
-    if (I->hasName()) {
-      if (I->isExternal())
-        UndefinedSymbols.insert(I->getName());
-      else if (!I->hasInternalLinkage())
-        DefinedSymbols.insert(I->getName());
-    }
-
-  // Add in all the external globals
-  for (Module::giterator I = M->gbegin(), E = M->gend(); 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(); )
-    if (DefinedSymbols.count(*I))
-      UndefinedSymbols.erase(I++);  // This symbol really is defined!
-    else
-      ++I; // Keep this symbol in the undefined symbols list
-}
-
-
-/// LoadObject - Read in and parse the bytecode file named by FN and return the
-/// module it contains (wrapped in an auto_ptr), or 0 and set ErrorMessage if an
-/// error occurs.
-///
-std::auto_ptr<Module> llvm::LoadObject(const std::string &FN,
-                                       std::string &ErrorMessage) {
-  std::string ParserErrorMessage;
-  Module *Result = ParseBytecodeFile(FN, &ParserErrorMessage);
-  if (Result) return std::auto_ptr<Module>(Result);
-  ErrorMessage = "Bytecode file '" + FN + "' could not be loaded";
-  if (ParserErrorMessage.size()) ErrorMessage += ": " + ParserErrorMessage;
-  return std::auto_ptr<Module>();
-}
-
-/// LinkInArchive - opens an archive library and link in all objects which
-/// provide symbols that are currently undefined.
-///
-/// Inputs:
-///  M        - The module in which to link the archives.
-///  Filename - The pathname of the archive.
-///  Verbose  - Flags whether verbose messages should be printed.
-///
-/// Outputs:
-///  ErrorMessage - A C++ string detailing what error occurred, if any.
-///
-/// Return Value:
-///  TRUE  - An error occurred.
-///  FALSE - No errors.
-///
-static bool LinkInArchive(Module *M,
-                          const std::string &Filename,
-                          std::string &ErrorMessage,
-                          bool Verbose)
-{
-  // Find all of the symbols currently undefined in the bytecode program.
-  // If all the symbols are defined, the program is complete, and there is
-  // no reason to link in any archive files.
-  std::set<std::string> UndefinedSymbols;
-  GetAllUndefinedSymbols(M, UndefinedSymbols);
-  if (UndefinedSymbols.empty()) {
-    if (Verbose) std::cerr << "  No symbols undefined, don't link library!\n";
-    return false;  // No need to link anything in!
-  }
-
-  // Load in the archive objects.
-  if (Verbose) std::cerr << "  Loading archive file '" << Filename << "'\n";
-  std::vector<Module*> Objects;
-  if (ReadArchiveFile(Filename, Objects, &ErrorMessage))
-    return true;
-
-  // Figure out which symbols are defined by all of the modules in the archive.
-  std::vector<std::set<std::string> > DefinedSymbols;
-  DefinedSymbols.resize(Objects.size());
-  for (unsigned i = 0; i != Objects.size(); ++i) {
-    GetAllDefinedSymbols(Objects[i], DefinedSymbols[i]);
-  }
-
-  // While we are linking in object files, loop.
-  bool Linked = true;
-  while (Linked) {     
-    Linked = false;
-
-    for (unsigned i = 0; i != Objects.size(); ++i) {
-      // Consider whether we need to link in this module...  we only need to
-      // link it in if it defines some symbol which is so far undefined.
-      //
-      const std::set<std::string> &DefSymbols = DefinedSymbols[i];
-
-      bool ObjectRequired = false;
-
-      //
-      // If the object defines main() and the program currently has main()
-      // undefined, then automatically link in the module.  Otherwise, look to
-      // see if it defines a symbol that is currently undefined.
-      //
-      if ((M->getMainFunction() == NULL) &&
-          ((DefSymbols.find ("main")) != DefSymbols.end())) {
-        ObjectRequired = true;
-      } else {
-        for (std::set<std::string>::iterator I = UndefinedSymbols.begin(),
-               E = UndefinedSymbols.end(); I != E; ++I)
-          if (DefSymbols.count(*I)) {
-            if (Verbose)
-              std::cerr << "  Found object '"
-                        << Objects[i]->getModuleIdentifier ()
-                        << "' providing symbol '" << *I << "'...\n";
-            ObjectRequired = true;
-            break;
-          }
-      }
-
-      // We DO need to link this object into the program...
-      if (ObjectRequired) {
-        if (LinkModules(M, Objects[i], &ErrorMessage))
-          return true;   // Couldn't link in the right object file...        
-        
-        // Since we have linked in this object, delete it from the list of
-        // objects to consider in this archive file.
-        std::swap(Objects[i], Objects.back());
-        std::swap(DefinedSymbols[i], DefinedSymbols.back());
-        Objects.pop_back();
-        DefinedSymbols.pop_back();
-        --i;   // Do not skip an entry
-        
-        // The undefined symbols set should have shrunk.
-        GetAllUndefinedSymbols(M, UndefinedSymbols);
-        Linked = true;  // We have linked something in!
-      }
-    }
-  }
-  
-  return false;
-}
-
-/// LinkInFile - opens a bytecode file and links in all objects which
-/// provide symbols that are currently undefined.
-///
-/// Inputs:
-///  HeadModule - The module in which to link the bytecode file.
-///  Filename   - The pathname of the bytecode file.
-///  Verbose    - Flags whether verbose messages should be printed.
-///
-/// Outputs:
-///  ErrorMessage - A C++ string detailing what error occurred, if any.
-///
-/// Return Value:
-///  TRUE  - An error occurred.
-///  FALSE - No errors.
-///
-static bool LinkInFile(Module *HeadModule,
-                       const std::string &Filename,
-                       std::string &ErrorMessage,
-                       bool Verbose)
-{
-  std::auto_ptr<Module> M(LoadObject(Filename, ErrorMessage));
-  if (M.get() == 0) return true;
-  bool Result = LinkModules(HeadModule, M.get(), &ErrorMessage);
-  if (Verbose) std::cerr << "Linked in bytecode file '" << Filename << "'\n";
-  return Result;
-}
-
-/// LinkFiles - takes a module and a list of files and links them all together.
-/// It locates the file either in the current directory, as its absolute
-/// or relative pathname, or as a file somewhere in LLVM_LIB_SEARCH_PATH.
-///
-/// Inputs:
-///  progname   - The name of the program (infamous argv[0]).
-///  HeadModule - The module under which all files will be linked.
-///  Files      - A vector of C++ strings indicating the LLVM bytecode filenames
-///               to be linked.  The names can refer to a mixture of pure LLVM
-///               bytecode files and archive (ar) formatted files.
-///  Verbose    - Flags whether verbose output should be printed while linking.
-///
-/// Outputs:
-///  HeadModule - The module will have the specified LLVM bytecode files linked
-///               in.
-///
-/// Return value:
-///  FALSE - No errors.
-///  TRUE  - Some error occurred.
-///
-bool llvm::LinkFiles(const char *progname, Module *HeadModule,
-                     const std::vector<std::string> &Files, bool Verbose) {
-  // String in which to receive error messages.
-  std::string ErrorMessage;
-
-  // Full pathname of the file
-  std::string Pathname;
-
-  // Get the library search path from the environment
-  char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH");
-
-  for (unsigned i = 0; i < Files.size(); ++i) {
-    // Determine where this file lives.
-    if (FileOpenable(Files[i])) {
-      Pathname = Files[i];
-    } else {
-      if (SearchPath == NULL) {
-        std::cerr << progname << ": Cannot find linker input file '"
-                  << Files[i] << "'\n";
-        std::cerr << progname
-                  << ": Warning: Your LLVM_LIB_SEARCH_PATH is unset.\n";
-        return true;
-      }
-
-      Pathname = std::string(SearchPath)+"/"+Files[i];
-      if (!FileOpenable(Pathname)) {
-        std::cerr << progname << ": Cannot find linker input file '"
-                  << Files[i] << "'\n";
-        return true;
-      }
-    }
-
-    // A user may specify an ar archive without -l, perhaps because it
-    // is not installed as a library. Detect that and link the library.
-    if (IsArchive(Pathname)) {
-      if (Verbose)
-        std::cerr << "Trying to link archive '" << Pathname << "'\n";
-
-      if (LinkInArchive(HeadModule, Pathname, ErrorMessage, Verbose)) {
-        std::cerr << progname << ": Error linking in archive '" << Pathname 
-                  << "': " << ErrorMessage << "\n";
-        return true;
-      }
-    } else if (IsBytecode(Pathname)) {
-      if (Verbose)
-        std::cerr << "Trying to link bytecode file '" << Pathname << "'\n";
-
-      if (LinkInFile(HeadModule, Pathname, ErrorMessage, Verbose)) {
-        std::cerr << progname << ": Error linking in bytecode file '"
-                  << Pathname << "': " << ErrorMessage << "\n";
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-/// LinkLibraries - takes the specified library files and links them into the
-/// main bytecode object file.
-///
-/// Inputs:
-///  progname   - The name of the program (infamous argv[0]).
-///  HeadModule - The module into which all necessary libraries will be linked.
-///  Libraries  - The list of libraries to link into the module.
-///  LibPaths   - The list of library paths in which to find libraries.
-///  Verbose    - Flags whether verbose messages should be printed.
-///  Native     - Flags whether native code is being generated.
-///
-/// Outputs:
-///  HeadModule - The module will have all necessary libraries linked in.
-///
-/// Return value:
-///  FALSE - No error.
-///  TRUE  - Error.
-///
-void llvm::LinkLibraries(const char *progname, Module *HeadModule,
-                         const std::vector<std::string> &Libraries,
-                         const std::vector<std::string> &LibPaths,
-                         bool Verbose, bool Native) {
-  // String in which to receive error messages.
-  std::string ErrorMessage;
-
-  for (unsigned i = 0; i < Libraries.size(); ++i) {
-    // Determine where this library lives.
-    std::string Pathname = FindLib(Libraries[i], LibPaths);
-    if (Pathname.empty()) {
-      // If the pathname does not exist, then continue to the next one if
-      // we're doing a native link and give an error if we're doing a bytecode
-      // link.
-      if (!Native) {
-        std::cerr << progname << ": WARNING: Cannot find library -l"
-                  << Libraries[i] << "\n";
-        continue;
-      }
-    }
-
-    // A user may specify an ar archive without -l, perhaps because it
-    // is not installed as a library. Detect that and link the library.
-    if (IsArchive(Pathname)) {
-      if (Verbose)
-        std::cerr << "Trying to link archive '" << Pathname << "' (-l"
-                  << Libraries[i] << ")\n";
-
-      if (LinkInArchive(HeadModule, Pathname, ErrorMessage, Verbose)) {
-        std::cerr << progname << ": " << ErrorMessage
-                  << ": Error linking in archive '" << Pathname << "' (-l"
-                  << Libraries[i] << ")\n";
-        exit(1);
-      }
-    } else if (IsBytecode(Pathname)) {
-      if (Verbose)
-        std::cerr << "Trying to link bytecode file '" << Pathname
-                  << "' (-l" << Libraries[i] << ")\n";
-
-      if (LinkInFile(HeadModule, Pathname, ErrorMessage, Verbose)) {
-        std::cerr << progname << ": " << ErrorMessage
-                  << ": error linking in bytecode file '" << Pathname << "' (-l"
-                  << Libraries[i] << ")\n";
-        exit(1);
-      }
-    }
-  }
-}