--- /dev/null
+//===- 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);
+}
+
--- /dev/null
+//===- 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);
+ }
+ }
+ }
+}
--- /dev/null
+##===- 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
--- /dev/null
+//===- 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;
+}
--- /dev/null
+//===- 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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