[llvm-commits] CVS: llvm/tools/llvm-ld/GenerateCode.cpp Linker.cpp Makefile llvm-ld.cpp llvm-ld.h

Reid Spencer reid at x10sys.com
Sun Sep 12 20:28:04 CDT 2004



Changes in directory llvm/tools/llvm-ld:

GenerateCode.cpp added (r1.1)
Linker.cpp added (r1.1)
Makefile added (r1.1)
llvm-ld.cpp added (r1.1)
llvm-ld.h added (r1.1)
---
Log message:

Initial implementation of llvm-ld: stolen from gccld.


---
Diffs of the changes:  (+1158 -0)

Index: llvm/tools/llvm-ld/GenerateCode.cpp
diff -c /dev/null llvm/tools/llvm-ld/GenerateCode.cpp:1.1
*** /dev/null	Sun Sep 12 20:28:03 2004
--- llvm/tools/llvm-ld/GenerateCode.cpp	Sun Sep 12 20:27:53 2004
***************
*** 0 ****
--- 1,353 ----
+ //===- GenerateCode.cpp - Functions for generating executable files  ------===//
+ // 
+ //                     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 functions for generating executable files once linking
+ // has finished.  This includes generating a shell script to run the JIT or
+ // a native executable derived from the bytecode.
+ //
+ //===----------------------------------------------------------------------===//
+ 
+ #include "llvm-ld.h"
+ #include "llvm/Module.h"
+ #include "llvm/PassManager.h"
+ #include "llvm/Analysis/LoadValueNumbering.h"
+ #include "llvm/Analysis/Passes.h"
+ #include "llvm/Analysis/Verifier.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/Support/SystemUtils.h"
+ #include "llvm/Support/CommandLine.h"
+ using namespace llvm;
+ 
+ namespace {
+   cl::opt<bool>
+   DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
+ 
+   cl::opt<bool>
+   Verify("verify", cl::desc("Verify intermediate results of all passes"));
+ 
+   cl::opt<bool>
+   DisableOptimizations("disable-opt",
+                        cl::desc("Do not run any optimization passes"));
+ }
+ 
+ /// CopyEnv - This function takes an array of environment variables and makes a
+ /// copy of it.  This copy can then be manipulated any way the caller likes
+ /// without affecting the process's real environment.
+ ///
+ /// Inputs:
+ ///  envp - An array of C strings containing an environment.
+ ///
+ /// Return value:
+ ///  NULL - An error occurred.
+ ///
+ ///  Otherwise, a pointer to a new array of C strings is returned.  Every string
+ ///  in the array is a duplicate of the one in the original array (i.e. we do
+ ///  not copy the char *'s from one array to another).
+ ///
+ static char ** CopyEnv(char ** const envp) {
+   // Count the number of entries in the old list;
+   unsigned entries;   // The number of entries in the old environment list
+   for (entries = 0; envp[entries] != NULL; entries++)
+     /*empty*/;
+ 
+   // Add one more entry for the NULL pointer that ends the list.
+   ++entries;
+ 
+   // If there are no entries at all, just return NULL.
+   if (entries == 0)
+     return NULL;
+ 
+   // Allocate a new environment list.
+   char **newenv = new char* [entries];
+   if ((newenv = new char* [entries]) == NULL)
+     return NULL;
+ 
+   // Make a copy of the list.  Don't forget the NULL that ends the list.
+   entries = 0;
+   while (envp[entries] != NULL) {
+     newenv[entries] = new char[strlen (envp[entries]) + 1];
+     strcpy (newenv[entries], envp[entries]);
+     ++entries;
+   }
+   newenv[entries] = NULL;
+ 
+   return newenv;
+ }
+ 
+ 
+ /// RemoveEnv - Remove the specified environment variable from the environment
+ /// array.
+ ///
+ /// Inputs:
+ ///  name - The name of the variable to remove.  It cannot be NULL.
+ ///  envp - The array of environment variables.  It cannot be NULL.
+ ///
+ /// Notes:
+ ///  This is mainly done because functions to remove items from the environment
+ ///  are not available across all platforms.  In particular, Solaris does not
+ ///  seem to have an unsetenv() function or a setenv() function (or they are
+ ///  undocumented if they do exist).
+ ///
+ static void RemoveEnv(const char * name, char ** const envp) {
+   for (unsigned index=0; envp[index] != NULL; index++) {
+     // Find the first equals sign in the array and make it an EOS character.
+     char *p = strchr (envp[index], '=');
+     if (p == NULL)
+       continue;
+     else
+       *p = '\0';
+ 
+     // Compare the two strings.  If they are equal, zap this string.
+     // Otherwise, restore it.
+     if (!strcmp(name, envp[index]))
+       *envp[index] = '\0';
+     else
+       *p = '=';
+   }
+ 
+   return;
+ }
+ 
+ static inline void addPass(PassManager &PM, Pass *P) {
+   // Add the pass to the pass manager...
+   PM.add(P);
+   
+   // If we are verifying all of the intermediate steps, add the verifier...
+   if (Verify) PM.add(createVerifierPass());
+ }
+ 
+ /// GenerateBytecode - generates a bytecode file from the specified module.
+ ///
+ /// Inputs:
+ ///  M           - The module for which bytecode should be generated.
+ ///  Strip       - Flags whether symbols should be stripped from the output.
+ ///  Internalize - Flags whether all symbols should be marked internal.
+ ///  Out         - Pointer to file stream to which to write the output.
+ ///
+ /// Returns non-zero value on error.
+ ///
+ int llvm::GenerateBytecode(Module *M, bool Strip, bool Internalize,
+                            std::ostream *Out) {
+   // In addition to just linking the input from GCC, we also want to spiff it up
+   // a little bit.  Do this now.
+   PassManager Passes;
+ 
+   if (Verify) Passes.add(createVerifierPass());
+ 
+   // Add an appropriate TargetData instance for this module...
+   addPass(Passes, new TargetData("gccld", M));
+ 
+   // Often if the programmer does not specify proper prototypes for the
+   // functions they are calling, they end up calling a vararg version of the
+   // function that does not get a body filled in (the real function has typed
+   // arguments).  This pass merges the two functions.
+   addPass(Passes, createFunctionResolvingPass());
+ 
+   if (!DisableOptimizations) {
+     if (Internalize) {
+       // Now that composite has been compiled, scan through the module, looking
+       // for a main function.  If main is defined, mark all other functions
+       // internal.
+       addPass(Passes, createInternalizePass());
+     }
+ 
+     // Now that we internalized some globals, see if we can mark any globals as
+     // being constant!
+     addPass(Passes, createGlobalConstifierPass());
+ 
+     // Linking modules together can lead to duplicated global constants, only
+     // keep one copy of each constant...
+     addPass(Passes, createConstantMergePass());
+ 
+     // If the -s command line option was specified, strip the symbols out of the
+     // resulting program to make it smaller.  -s is a GCC option that we are
+     // supporting.
+     if (Strip)
+       addPass(Passes, createSymbolStrippingPass());
+ 
+     // Propagate constants at call sites into the functions they call.
+     addPass(Passes, createIPConstantPropagationPass());
+ 
+     // Remove unused arguments from functions...
+     addPass(Passes, createDeadArgEliminationPass());
+ 
+     if (!DisableInline)
+       addPass(Passes, createFunctionInliningPass()); // Inline small functions
+ 
+     addPass(Passes, createPruneEHPass());            // Remove dead EH info
+     addPass(Passes, createGlobalDCEPass());          // Remove dead functions
+ 
+     // If we didn't decide to inline a function, check to see if we can
+     // transform it to pass arguments by value instead of by reference.
+     addPass(Passes, createArgumentPromotionPass());
+ 
+     // The IPO passes may leave cruft around.  Clean up after them.
+     addPass(Passes, createInstructionCombiningPass());
+ 
+     addPass(Passes, createScalarReplAggregatesPass()); // Break up allocas
+ 
+     // Run a few AA driven optimizations here and now, to cleanup the code.
+     addPass(Passes, createGlobalsModRefPass());      // IP alias analysis
+ 
+     addPass(Passes, createLICMPass());               // Hoist loop invariants
+     addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
+     addPass(Passes, createGCSEPass());               // Remove common subexprs
+     addPass(Passes, createDeadStoreEliminationPass()); // Nuke dead stores
+ 
+     // Cleanup and simplify the code after the scalar optimizations.
+     addPass(Passes, createInstructionCombiningPass());
+ 
+     // Delete basic blocks, which optimization passes may have killed...
+     addPass(Passes, createCFGSimplificationPass());
+ 
+     // Now that we have optimized the program, discard unreachable functions...
+     addPass(Passes, createGlobalDCEPass());
+   }
+ 
+   // Make sure everything is still good.
+   Passes.add(createVerifierPass());
+ 
+   // Add the pass that writes bytecode to the output file...
+   addPass(Passes, new WriteBytecodePass(Out));
+ 
+   // Run our queue of passes all at once now, efficiently.
+   Passes.run(*M);
+ 
+   return 0;
+ }
+ 
+ /// GenerateAssembly - generates a native assembly language source file from the
+ /// specified bytecode file.
+ ///
+ /// Inputs:
+ ///  InputFilename  - The name of the output bytecode file.
+ ///  OutputFilename - The name of the file to generate.
+ ///  llc            - The pathname to use for LLC.
+ ///  envp           - The environment to use when running LLC.
+ ///
+ /// Return non-zero value on error.
+ ///
+ int llvm::GenerateAssembly(const std::string &OutputFilename,
+                            const std::string &InputFilename,
+                            const std::string &llc,
+                            char ** const envp) {
+   // Run LLC to convert the bytecode file into assembly code.
+   const char *cmd[6];
+   cmd[0] = llc.c_str();
+   cmd[1] = "-f";
+   cmd[2] = "-o";
+   cmd[3] = OutputFilename.c_str();
+   cmd[4] = InputFilename.c_str();
+   cmd[5] = 0;
+ 
+   return ExecWait(cmd, envp);
+ }
+ 
+ /// GenerateAssembly - generates a native assembly language source file from the
+ /// specified bytecode file.
+ int llvm::GenerateCFile(const std::string &OutputFile,
+                         const std::string &InputFile,
+                         const std::string &llc, char ** const envp) {
+   // Run LLC to convert the bytecode file into C.
+   const char *cmd[7];
+ 
+   cmd[0] = llc.c_str();
+   cmd[1] = "-march=c";
+   cmd[2] = "-f";
+   cmd[3] = "-o";
+   cmd[4] = OutputFile.c_str();
+   cmd[5] = InputFile.c_str();
+   cmd[6] = 0;
+   return ExecWait(cmd, envp);
+ }
+ 
+ /// GenerateNative - generates a native assembly language source file from the
+ /// specified assembly source file.
+ ///
+ /// Inputs:
+ ///  InputFilename  - The name of the output bytecode file.
+ ///  OutputFilename - The name of the file to generate.
+ ///  Libraries      - The list of libraries with which to link.
+ ///  LibPaths       - The list of directories in which to find libraries.
+ ///  gcc            - The pathname to use for GGC.
+ ///  envp           - A copy of the process's current environment.
+ ///
+ /// Outputs:
+ ///  None.
+ ///
+ /// Returns non-zero value on error.
+ ///
+ int llvm::GenerateNative(const std::string &OutputFilename,
+                          const std::string &InputFilename,
+                          const std::vector<std::string> &Libraries,
+                          const std::vector<std::string> &LibPaths,
+                          const std::string &gcc, char ** const envp) {
+   // Remove these environment variables from the environment of the
+   // programs that we will execute.  It appears that GCC sets these
+   // environment variables so that the programs it uses can configure
+   // themselves identically.
+   //
+   // However, when we invoke GCC below, we want it to use its normal
+   // configuration.  Hence, we must sanitize its environment.
+   char ** clean_env = CopyEnv(envp);
+   if (clean_env == NULL)
+     return 1;
+   RemoveEnv("LIBRARY_PATH", clean_env);
+   RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
+   RemoveEnv("GCC_EXEC_PREFIX", clean_env);
+   RemoveEnv("COMPILER_PATH", clean_env);
+   RemoveEnv("COLLECT_GCC", clean_env);
+ 
+   std::vector<const char *> cmd;
+ 
+   // Run GCC to assemble and link the program into native code.
+   //
+   // Note:
+   //  We can't just assemble and link the file with the system assembler
+   //  and linker because we don't know where to put the _start symbol.
+   //  GCC mysteriously knows how to do it.
+   cmd.push_back(gcc.c_str());
+   cmd.push_back("-fno-strict-aliasing");
+   cmd.push_back("-O3");
+   cmd.push_back("-o");
+   cmd.push_back(OutputFilename.c_str());
+   cmd.push_back(InputFilename.c_str());
+ 
+   // Adding the library paths creates a problem for native generation.  If we
+   // include the search paths from llvmgcc, then we'll be telling normal gcc
+   // to look inside of llvmgcc's library directories for libraries.  This is
+   // bad because those libraries hold only bytecode files (not native object
+   // files).  In the end, we attempt to link the bytecode libgcc into a native
+   // program.
+ #if 0
+   // Add in the library path options.
+   for (unsigned index=0; index < LibPaths.size(); index++) {
+     cmd.push_back("-L");
+     cmd.push_back(LibPaths[index].c_str());
+   }
+ #endif
+ 
+   // Add in the libraries to link.
+   std::vector<std::string> Libs(Libraries);
+   for (unsigned index = 0; index < Libs.size(); index++) {
+     if (Libs[index] != "crtend") {
+       Libs[index] = "-l" + Libs[index];
+       cmd.push_back(Libs[index].c_str());
+     }
+   }
+   cmd.push_back(NULL);
+ 
+   // Run the compiler to assembly and link together the program.
+   return ExecWait(&(cmd[0]), clean_env);
+ }
+ 


Index: llvm/tools/llvm-ld/Linker.cpp
diff -c /dev/null llvm/tools/llvm-ld/Linker.cpp:1.1
*** /dev/null	Sun Sep 12 20:28:04 2004
--- llvm/tools/llvm-ld/Linker.cpp	Sun Sep 12 20:27:53 2004
***************
*** 0 ****
--- 1,419 ----
+ //===- 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/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.
+   if (FileOpenable(Filename))
+     return Filename;
+ 
+   // If that doesn't work, convert the name into a library name.
+   std::string LibName = "lib" + Filename;
+ 
+   // Iterate over the directories in Paths to see if we can find the library
+   // there.
+   for (unsigned Index = 0; Index != Paths.size(); ++Index) {
+     std::string Directory = Paths[Index] + "/";
+ 
+     if (!SharedObjectOnly && FileOpenable(Directory + LibName + ".bc"))
+       return Directory + LibName + ".bc";
+ 
+     if (FileOpenable(Directory + LibName + SHLIBEXT))
+       return Directory + LibName + SHLIBEXT;
+ 
+     if (!SharedObjectOnly && FileOpenable(Directory + LibName + ".a"))
+       return Directory + LibName + ".a";
+   }
+ 
+   // One last hope: Check LLVM_LIB_SEARCH_PATH.
+   char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH");
+   if (SearchPath == NULL)
+     return std::string();
+ 
+   LibName = std::string(SearchPath) + "/" + LibName;
+   if (FileOpenable(LibName))
+     return LibName;
+ 
+   return std::string();
+ }
+ 
+ /// 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
+   
+   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());
+     }
+   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);
+       }
+     }
+   }
+ }


Index: llvm/tools/llvm-ld/Makefile
diff -c /dev/null llvm/tools/llvm-ld/Makefile:1.1
*** /dev/null	Sun Sep 12 20:28:04 2004
--- llvm/tools/llvm-ld/Makefile	Sun Sep 12 20:27:53 2004
***************
*** 0 ****
--- 1,16 ----
+ ##===- tools/gccld/Makefile --------------------------------*- Makefile -*-===##
+ # 
+ #                     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.
+ # 
+ ##===----------------------------------------------------------------------===##
+ 
+ LEVEL = ../..
+ 
+ TOOLNAME = llvm-ld
+ USEDLIBS = ipo.a transforms.a scalaropts.a analysis.a ipa.a transformutils.a \
+            target.a bcreader bcwriter vmcore support.a LLVMsystem.a
+ 
+ include $(LEVEL)/Makefile.common


Index: llvm/tools/llvm-ld/llvm-ld.cpp
diff -c /dev/null llvm/tools/llvm-ld/llvm-ld.cpp:1.1
*** /dev/null	Sun Sep 12 20:28:04 2004
--- llvm/tools/llvm-ld/llvm-ld.cpp	Sun Sep 12 20:27:53 2004
***************
*** 0 ****
--- 1,303 ----
+ //===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
+ // 
+ //                     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 utility is intended to be compatible with GCC, and follows standard
+ // system 'ld' conventions.  As such, the default output file is ./a.out.
+ // Additionally, this program outputs a shell script that is used to invoke LLI
+ // to execute the program.  In this manner, the generated executable (a.out for
+ // example), is directly executable, whereas the bytecode file actually lives in
+ // the a.out.bc file generated by this program.  Also, Force is on by default.
+ //
+ // Note that if someone (or a script) deletes the executable program generated,
+ // the .bc file will be left around.  Considering that this is a temporary hack,
+ // I'm not too worried about this.
+ //
+ //===----------------------------------------------------------------------===//
+ 
+ #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/Support/CommandLine.h"
+ #include "llvm/Support/FileUtilities.h"
+ #include "llvm/System/Signals.h"
+ #include "llvm/Support/SystemUtils.h"
+ #include <fstream>
+ #include <memory>
+ using namespace llvm;
+ 
+ enum OptimizationLevels {
+   OPT_FAST_COMPILE,
+   OPT_SIMPLE,
+   OPT_AGGRESSIVE,
+   OPT_LINK_TIME,
+   OPT_AGGRESSIVE_LINK_TIME
+ };
+ 
+ namespace {
+   cl::list<std::string> 
+   InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
+                  cl::OneOrMore);
+ 
+   cl::opt<std::string> 
+   OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
+                  cl::value_desc("filename"));
+ 
+   cl::opt<bool>    
+   Verbose("v", cl::desc("Print information about actions taken"));
+   
+   cl::list<std::string> 
+   LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
+            cl::value_desc("directory"));
+ 
+   cl::list<std::string> 
+   Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
+             cl::value_desc("library prefix"));
+ 
+   cl::opt<bool>
+   Strip("s", cl::desc("Strip symbol info from executable"));
+ 
+   cl::opt<bool>
+   NoInternalize("disable-internalize",
+                 cl::desc("Do not mark all symbols as internal"));
+   cl::alias
+   ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
+                 cl::aliasopt(NoInternalize));
+ 
+   cl::opt<bool>
+   LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
+                                             " library, not an executable"));
+   cl::alias
+   Relink("r", cl::desc("Alias for -link-as-library"),
+          cl::aliasopt(LinkAsLibrary));
+ 
+   cl::opt<bool>    
+   Native("native",
+          cl::desc("Generate a native binary instead of a shell script"));
+   cl::opt<bool>    
+   NativeCBE("native-cbe",
+             cl::desc("Generate a native binary with the C backend and GCC"));
+   
+   // Compatibility options that are ignored but supported by LD
+   cl::opt<std::string>
+   CO3("soname", cl::Hidden, cl::desc("Compatibility option: ignored"));
+   cl::opt<std::string>
+   CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
+   cl::opt<bool>
+   CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
+   cl::opt<std::string>
+   CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
+ 
+   cl::opt<OptimizationLevels> OptLevel(
+     cl::desc("Choose level of optimization to apply:"),
+     cl::init(OPT_FAST_COMPILE), cl::values(
+       clEnumValN(OPT_FAST_COMPILE,"O0",
+         "An alias for the -O1 option."),
+       clEnumValN(OPT_FAST_COMPILE,"O1",
+         "Optimize for linking speed, not execution speed."),
+       clEnumValN(OPT_SIMPLE,"O2",
+         "Perform only required/minimal optimizations"),
+       clEnumValN(OPT_AGGRESSIVE,"O3",
+         "An alias for the -O2 option."),
+       clEnumValN(OPT_LINK_TIME,"O4",
+         "Perform standard link time optimizations"),
+       clEnumValN(OPT_AGGRESSIVE_LINK_TIME,"O5",
+         "Perform aggressive link time optimizations"),
+       clEnumValEnd
+     )
+   );
+ }
+ 
+ /// PrintAndReturn - Prints a message to standard error and returns true.
+ ///
+ /// Inputs:
+ ///  progname - The name of the program (i.e. argv[0]).
+ ///  Message  - The message to print to standard error.
+ ///
+ static int PrintAndReturn(const char *progname, const std::string &Message) {
+   std::cerr << progname << ": " << Message << "\n";
+   return 1;
+ }
+ 
+ /// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
+ /// bytecode file for the program.
+ static void EmitShellScript(char **argv) {
+ #if defined(_WIN32) || defined(__CYGWIN__)
+   // Windows doesn't support #!/bin/sh style shell scripts in .exe files.  To
+   // support windows systems, we copy the llvm-stub.exe executable from the
+   // build tree to the destination file.
+   std::string llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
+   if (llvmstub.empty()) {
+     std::cerr << "Could not find llvm-stub.exe executable!\n";
+     exit(1);
+   }
+   if (CopyFile(OutputFilename, llvmstub)) {
+     std::cerr << "Could not copy the llvm-stub.exe executable!\n";
+     exit(1);
+   }
+   return;
+ #endif
+ 
+   // Output the script to start the program...
+   std::ofstream Out2(OutputFilename.c_str());
+   if (!Out2.good())
+     exit(PrintAndReturn(argv[0], "error opening '" + OutputFilename +
+                                  "' for writing!"));
+ 
+   Out2 << "#!/bin/sh\n";
+   // Allow user to setenv LLVMINTERP if lli is not in their PATH.
+   Out2 << "lli=${LLVMINTERP-lli}\n";
+   Out2 << "exec $lli \\\n";
+   // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
+   LibPaths.push_back("/lib");
+   LibPaths.push_back("/usr/lib");
+   LibPaths.push_back("/usr/X11R6/lib");
+   // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
+   // shared object at all! See RH 8: plain text.
+   std::vector<std::string>::iterator libc = 
+     std::find(Libraries.begin(), Libraries.end(), "c");
+   if (libc != Libraries.end()) Libraries.erase(libc);
+   // List all the shared object (native) libraries this executable will need
+   // on the command line, so that we don't have to do this manually!
+   for (std::vector<std::string>::iterator i = Libraries.begin(), 
+          e = Libraries.end(); i != e; ++i) {
+     std::string FullLibraryPath = FindLib(*i, LibPaths, true);
+     if (!FullLibraryPath.empty() && IsSharedObject(FullLibraryPath))
+       Out2 << "    -load=" << FullLibraryPath << " \\\n";
+   }
+   Out2 << "    $0.bc ${1+\"$@\"}\n";
+   Out2.close();
+ }
+ 
+ int main(int argc, char **argv, char **envp) {
+   cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
+   sys::PrintStackTraceOnErrorSignal();
+ 
+   std::string ModuleID("gccld-output");
+   std::auto_ptr<Module> Composite(new Module(ModuleID));
+ 
+   // We always look first in the current directory when searching for libraries.
+   LibPaths.insert(LibPaths.begin(), ".");
+ 
+   // If the user specified an extra search path in their environment, respect
+   // it.
+   if (char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH"))
+     LibPaths.push_back(SearchPath);
+ 
+   // Remove any consecutive duplicates of the same library...
+   Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
+                   Libraries.end());
+ 
+   // Link in all of the files
+   if (LinkFiles(argv[0], Composite.get(), InputFilenames, Verbose))
+     return 1; // Error already printed
+ 
+   if (!LinkAsLibrary)
+     LinkLibraries(argv[0], Composite.get(), Libraries, LibPaths,
+                   Verbose, Native);
+ 
+   // Link in all of the libraries next...
+ 
+   // Create the output file.
+   std::string RealBytecodeOutput = OutputFilename;
+   if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
+   std::ofstream Out(RealBytecodeOutput.c_str());
+   if (!Out.good())
+     return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
+                                    "' for writing!");
+ 
+   // Ensure that the bytecode file gets removed from the disk if we get a
+   // SIGINT signal.
+   sys::RemoveFileOnSignal(RealBytecodeOutput);
+ 
+   // Generate the bytecode file.
+   if (GenerateBytecode(Composite.get(), Strip, !NoInternalize, &Out)) {
+     Out.close();
+     return PrintAndReturn(argv[0], "error generating bytecode");
+   }
+ 
+   // Close the bytecode file.
+   Out.close();
+ 
+   // If we are not linking a library, generate either a native executable
+   // or a JIT shell script, depending upon what the user wants.
+   if (!LinkAsLibrary) {
+     // If the user wants to generate a native executable, compile it from the
+     // bytecode file.
+     //
+     // Otherwise, create a script that will run the bytecode through the JIT.
+     if (Native) {
+       // Name of the Assembly Language output file
+       std::string AssemblyFile = OutputFilename + ".s";
+ 
+       // Mark the output files for removal if we get an interrupt.
+       sys::RemoveFileOnSignal(AssemblyFile);
+       sys::RemoveFileOnSignal(OutputFilename);
+ 
+       // Determine the locations of the llc and gcc programs.
+       std::string llc = FindExecutable("llc", argv[0]);
+       std::string gcc = FindExecutable("gcc", argv[0]);
+       if (llc.empty())
+         return PrintAndReturn(argv[0], "Failed to find llc");
+ 
+       if (gcc.empty())
+         return PrintAndReturn(argv[0], "Failed to find gcc");
+ 
+       // Generate an assembly language file for the bytecode.
+       if (Verbose) std::cout << "Generating Assembly Code\n";
+       GenerateAssembly(AssemblyFile, RealBytecodeOutput, llc, envp);
+       if (Verbose) std::cout << "Generating Native Code\n";
+       GenerateNative(OutputFilename, AssemblyFile, Libraries, LibPaths,
+                      gcc, envp);
+ 
+       // Remove the assembly language file.
+       removeFile (AssemblyFile);
+     } else if (NativeCBE) {
+       std::string CFile = OutputFilename + ".cbe.c";
+ 
+       // Mark the output files for removal if we get an interrupt.
+       sys::RemoveFileOnSignal(CFile);
+       sys::RemoveFileOnSignal(OutputFilename);
+ 
+       // Determine the locations of the llc and gcc programs.
+       std::string llc = FindExecutable("llc", argv[0]);
+       std::string gcc = FindExecutable("gcc", argv[0]);
+       if (llc.empty())
+         return PrintAndReturn(argv[0], "Failed to find llc");
+       if (gcc.empty())
+         return PrintAndReturn(argv[0], "Failed to find gcc");
+ 
+       // Generate an assembly language file for the bytecode.
+       if (Verbose) std::cout << "Generating Assembly Code\n";
+       GenerateCFile(CFile, RealBytecodeOutput, llc, envp);
+       if (Verbose) std::cout << "Generating Native Code\n";
+       GenerateNative(OutputFilename, CFile, Libraries, LibPaths, gcc, envp);
+ 
+       // Remove the assembly language file.
+       removeFile(CFile);
+ 
+     } else {
+       EmitShellScript(argv);
+     }
+   
+     // Make the script executable...
+     MakeFileExecutable(OutputFilename);
+ 
+     // Make the bytecode file readable and directly executable in LLEE as well
+     MakeFileExecutable(RealBytecodeOutput);
+     MakeFileReadable(RealBytecodeOutput);
+   }
+ 
+   return 0;
+ }


Index: llvm/tools/llvm-ld/llvm-ld.h
diff -c /dev/null llvm/tools/llvm-ld/llvm-ld.h:1.1
*** /dev/null	Sun Sep 12 20:28:04 2004
--- llvm/tools/llvm-ld/llvm-ld.h	Sun Sep 12 20:27:53 2004
***************
*** 0 ****
--- 1,67 ----
+ //===- llvm-ld.h - Utility functions header file ----------------*- C++ -*-===//
+ // 
+ //                     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 function prototypes for the functions in util.cpp.
+ //
+ //===----------------------------------------------------------------------===//
+ 
+ #include "llvm/Module.h"
+ 
+ #include <string>
+ #include <set>
+ #include <ostream>
+ 
+ namespace llvm {
+ 
+ void
+ GetAllDefinedSymbols (Module *M, std::set<std::string> &DefinedSymbols);
+ 
+ void
+ GetAllUndefinedSymbols(Module *M, std::set<std::string> &UndefinedSymbols);
+ 
+ int
+ GenerateBytecode (Module * M,
+                   bool Strip,
+                   bool Internalize,
+                   std::ostream * Out);
+ 
+ int
+ GenerateAssembly (const std::string & OutputFilename,
+                   const std::string & InputFilename,
+                   const std::string & llc,
+                   char ** const envp);
+ 
+ int GenerateCFile(const std::string &OutputFile, const std::string &InputFile,
+                   const std::string &llc, char ** const envp);
+ int
+ GenerateNative (const std::string & OutputFilename,
+                 const std::string & InputFilename,
+                 const std::vector<std::string> & Libraries,
+                 const std::vector<std::string> & LibPaths,
+                 const std::string & gcc,
+                 char ** const envp);
+ 
+ std::auto_ptr<Module>
+ LoadObject (const std::string & FN, std::string &OutErrorMessage);
+ 
+ std::string FindLib(const std::string &Filename,
+                     const std::vector<std::string> &Paths,
+                     bool SharedObjectOnly = false);
+   
+ void LinkLibraries (const char * progname, Module* HeadModule,
+                     const std::vector<std::string> & Libraries,
+                     const std::vector<std::string> & LibPaths,
+                     bool Verbose, bool Native);
+ bool
+ LinkFiles (const char * progname,
+            Module * HeadModule,
+            const std::vector<std::string> & Files,
+            bool Verbose);
+ 
+ } // End llvm namespace






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