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Initial implementation of llvm-ld: stolen from gccld.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16305 91177308-0d34-0410-b5e6-96231b3b80d8
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Reid Spencer 2004-09-13 01:27:53 +00:00
parent 247384c041
commit c0af3f0052
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353
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//===- 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);
}

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//===- 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);
}
}
}
}

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##===- 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

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//===- 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;
}

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//===- 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