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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28288 91177308-0d34-0410-b5e6-96231b3b80d8
572 lines
20 KiB
C++
572 lines
20 KiB
C++
//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility is intended to be compatible with GCC, and follows standard
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// system 'ld' conventions. As such, the default output file is ./a.out.
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// Additionally, this program outputs a shell script that is used to invoke LLI
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// to execute the program. In this manner, the generated executable (a.out for
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// example), is directly executable, whereas the bytecode file actually lives in
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// the a.out.bc file generated by this program. Also, Force is on by default.
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//
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// Note that if someone (or a script) deletes the executable program generated,
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// the .bc file will be left around. Considering that this is a temporary hack,
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// I'm not too worried about this.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Linker.h"
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#include "llvm/System/Program.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/Writer.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/System/Signals.h"
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#include <fstream>
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#include <iostream>
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#include <memory>
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using namespace llvm;
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// Input/Output Options
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static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bytecode files>"));
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static cl::opt<std::string> OutputFilename("o", cl::init("a.out"),
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cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool> Verbose("v",
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cl::desc("Print information about actions taken"));
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static cl::list<std::string> LibPaths("L", cl::Prefix,
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cl::desc("Specify a library search path"),
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cl::value_desc("directory"));
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static cl::list<std::string> Libraries("l", cl::Prefix,
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cl::desc("Specify libraries to link to"),
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cl::value_desc("library prefix"));
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static cl::opt<bool> LinkAsLibrary("link-as-library",
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cl::desc("Link the .bc files together as a library, not an executable"));
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static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary),
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cl::desc("Alias for -link-as-library"));
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static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
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MachineArch("march", cl::desc("Architecture to generate assembly for:"));
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static cl::opt<bool> Native("native",
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cl::desc("Generate a native binary instead of a shell script"));
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static cl::opt<bool>NativeCBE("native-cbe",
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cl::desc("Generate a native binary with the C backend and GCC"));
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static cl::opt<bool>DisableCompression("disable-compression",cl::init(false),
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cl::desc("Disable writing of compressed bytecode files"));
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static cl::list<std::string> PostLinkOpts("post-link-opts",
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cl::value_desc("path to post-link optimization programs"),
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cl::desc("Run one or more optimization programs after linking"));
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// Compatibility options that are ignored but supported by LD
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static cl::opt<std::string> CO3("soname", cl::Hidden,
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cl::desc("Compatibility option: ignored"));
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static cl::opt<std::string> CO4("version-script", cl::Hidden,
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cl::desc("Compatibility option: ignored"));
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static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden,
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cl::desc("Compatibility option: ignored"));
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static cl::opt<std::string> CO6("h", cl::Hidden,
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cl::desc("Compatibility option: ignored"));
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/// This is just for convenience so it doesn't have to be passed around
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/// everywhere.
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static std::string progname;
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/// PrintAndReturn - Prints a message to standard error and returns true.
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///
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/// Inputs:
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/// progname - The name of the program (i.e. argv[0]).
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/// Message - The message to print to standard error.
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///
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static int PrintAndReturn(const std::string &Message) {
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std::cerr << progname << ": " << Message << "\n";
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return 1;
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}
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/// CopyEnv - This function takes an array of environment variables and makes a
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/// copy of it. This copy can then be manipulated any way the caller likes
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/// without affecting the process's real environment.
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///
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/// Inputs:
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/// envp - An array of C strings containing an environment.
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///
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/// Return value:
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/// NULL - An error occurred.
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///
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/// Otherwise, a pointer to a new array of C strings is returned. Every string
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/// in the array is a duplicate of the one in the original array (i.e. we do
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/// not copy the char *'s from one array to another).
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///
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static char ** CopyEnv(char ** const envp) {
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// Count the number of entries in the old list;
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unsigned entries; // The number of entries in the old environment list
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for (entries = 0; envp[entries] != NULL; entries++)
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/*empty*/;
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// Add one more entry for the NULL pointer that ends the list.
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++entries;
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// If there are no entries at all, just return NULL.
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if (entries == 0)
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return NULL;
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// Allocate a new environment list.
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char **newenv = new char* [entries];
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if ((newenv = new char* [entries]) == NULL)
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return NULL;
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// Make a copy of the list. Don't forget the NULL that ends the list.
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entries = 0;
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while (envp[entries] != NULL) {
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newenv[entries] = new char[strlen (envp[entries]) + 1];
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strcpy (newenv[entries], envp[entries]);
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++entries;
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}
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newenv[entries] = NULL;
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return newenv;
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}
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/// RemoveEnv - Remove the specified environment variable from the environment
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/// array.
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///
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/// Inputs:
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/// name - The name of the variable to remove. It cannot be NULL.
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/// envp - The array of environment variables. It cannot be NULL.
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///
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/// Notes:
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/// This is mainly done because functions to remove items from the environment
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/// are not available across all platforms. In particular, Solaris does not
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/// seem to have an unsetenv() function or a setenv() function (or they are
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/// undocumented if they do exist).
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///
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static void RemoveEnv(const char * name, char ** const envp) {
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for (unsigned index=0; envp[index] != NULL; index++) {
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// Find the first equals sign in the array and make it an EOS character.
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char *p = strchr (envp[index], '=');
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if (p == NULL)
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continue;
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else
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*p = '\0';
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// Compare the two strings. If they are equal, zap this string.
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// Otherwise, restore it.
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if (!strcmp(name, envp[index]))
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*envp[index] = '\0';
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else
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*p = '=';
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}
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return;
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}
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/// GenerateBytecode - generates a bytecode file from the module provided
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void GenerateBytecode(Module* M, const std::string& FileName) {
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// Create the output file.
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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std::ofstream Out(FileName.c_str(), io_mode);
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if (!Out.good()) {
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PrintAndReturn("error opening '" + FileName + "' for writing!");
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return;
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}
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// Ensure that the bytecode file gets removed from the disk if we get a
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// terminating signal.
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sys::RemoveFileOnSignal(sys::Path(FileName));
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// Write it out
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WriteBytecodeToFile(M, Out, !DisableCompression);
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// Close the bytecode file.
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Out.close();
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}
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/// GenerateAssembly - generates a native assembly language source file from the
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/// specified bytecode file.
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///
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/// Inputs:
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/// InputFilename - The name of the output bytecode file.
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/// OutputFilename - The name of the file to generate.
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/// llc - The pathname to use for LLC.
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/// envp - The environment to use when running LLC.
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///
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/// Return non-zero value on error.
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///
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static int GenerateAssembly(const std::string &OutputFilename,
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const std::string &InputFilename,
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const sys::Path &llc) {
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// Run LLC to convert the bytecode file into assembly code.
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std::vector<const char*> args;
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args.push_back(llc.c_str());
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args.push_back("-f");
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args.push_back("-o");
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args.push_back(OutputFilename.c_str());
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args.push_back(InputFilename.c_str());
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args.push_back(0);
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return sys::Program::ExecuteAndWait(llc,&args[0]);
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}
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/// GenerateAssembly - generates a native assembly language source file from the
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/// specified bytecode file.
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static int GenerateCFile(const std::string &OutputFile,
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const std::string &InputFile,
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const sys::Path &llc) {
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// Run LLC to convert the bytecode file into C.
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std::vector<const char*> args;
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args.push_back(llc.c_str());
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args.push_back("-march=c");
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args.push_back("-f");
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args.push_back("-o");
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args.push_back(OutputFile.c_str());
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args.push_back(InputFile.c_str());
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args.push_back(0);
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return sys::Program::ExecuteAndWait(llc, &args[0]);
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}
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/// GenerateNative - generates a native assembly language source file from the
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/// specified assembly source file.
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///
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/// Inputs:
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/// InputFilename - The name of the output bytecode file.
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/// OutputFilename - The name of the file to generate.
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/// Libraries - The list of libraries with which to link.
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/// LibPaths - The list of directories in which to find libraries.
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/// gcc - The pathname to use for GGC.
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/// envp - A copy of the process's current environment.
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///
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/// Outputs:
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/// None.
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///
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/// Returns non-zero value on error.
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///
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static int GenerateNative(const std::string &OutputFilename,
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const std::string &InputFilename,
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const std::vector<std::string> &Libraries,
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const sys::Path &gcc, char ** const envp) {
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// Remove these environment variables from the environment of the
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// programs that we will execute. It appears that GCC sets these
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// environment variables so that the programs it uses can configure
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// themselves identically.
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//
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// However, when we invoke GCC below, we want it to use its normal
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// configuration. Hence, we must sanitize its environment.
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char ** clean_env = CopyEnv(envp);
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if (clean_env == NULL)
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return 1;
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RemoveEnv("LIBRARY_PATH", clean_env);
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RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
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RemoveEnv("GCC_EXEC_PREFIX", clean_env);
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RemoveEnv("COMPILER_PATH", clean_env);
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RemoveEnv("COLLECT_GCC", clean_env);
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// Run GCC to assemble and link the program into native code.
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//
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// Note:
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// We can't just assemble and link the file with the system assembler
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// and linker because we don't know where to put the _start symbol.
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// GCC mysteriously knows how to do it.
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std::vector<const char*> args;
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args.push_back(gcc.c_str());
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args.push_back("-fno-strict-aliasing");
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args.push_back("-O3");
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args.push_back("-o");
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args.push_back(OutputFilename.c_str());
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args.push_back(InputFilename.c_str());
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// Add in the libraries to link.
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for (unsigned index = 0; index < Libraries.size(); index++)
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if (Libraries[index] != "crtend") {
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args.push_back("-l");
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args.push_back(Libraries[index].c_str());
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}
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args.push_back(0);
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// Run the compiler to assembly and link together the program.
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int R = sys::Program::ExecuteAndWait(gcc, &args[0], (const char**)clean_env);
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delete [] clean_env;
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return R;
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}
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/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
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/// bytecode file for the program.
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static void EmitShellScript(char **argv) {
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#if defined(_WIN32) || defined(__CYGWIN__)
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// Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
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// support windows systems, we copy the llvm-stub.exe executable from the
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// build tree to the destination file.
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sys::Path llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
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if (llvmstub.isEmpty()) {
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std::cerr << "Could not find llvm-stub.exe executable!\n";
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exit(1);
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}
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sys::CopyFile(sys::Path(OutputFilename), llvmstub);
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return;
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#endif
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// Output the script to start the program...
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std::ofstream Out2(OutputFilename.c_str());
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if (!Out2.good())
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exit(PrintAndReturn("error opening '" + OutputFilename + "' for writing!"));
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Out2 << "#!/bin/sh\n";
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// Allow user to setenv LLVMINTERP if lli is not in their PATH.
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Out2 << "lli=${LLVMINTERP-lli}\n";
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Out2 << "exec $lli \\\n";
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// gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
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LibPaths.push_back("/lib");
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LibPaths.push_back("/usr/lib");
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LibPaths.push_back("/usr/X11R6/lib");
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// We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
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// shared object at all! See RH 8: plain text.
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std::vector<std::string>::iterator libc =
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std::find(Libraries.begin(), Libraries.end(), "c");
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if (libc != Libraries.end()) Libraries.erase(libc);
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// List all the shared object (native) libraries this executable will need
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// on the command line, so that we don't have to do this manually!
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for (std::vector<std::string>::iterator i = Libraries.begin(),
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e = Libraries.end(); i != e; ++i) {
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sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
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if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
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Out2 << " -load=" << FullLibraryPath.toString() << " \\\n";
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}
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Out2 << " $0.bc ${1+\"$@\"}\n";
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Out2.close();
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}
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// BuildLinkItems -- This function generates a LinkItemList for the LinkItems
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// linker function by combining the Files and Libraries in the order they were
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// declared on the command line.
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static void BuildLinkItems(
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Linker::ItemList& Items,
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const cl::list<std::string>& Files,
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const cl::list<std::string>& Libraries) {
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// Build the list of linkage items for LinkItems.
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cl::list<std::string>::const_iterator fileIt = Files.begin();
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cl::list<std::string>::const_iterator libIt = Libraries.begin();
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int libPos = -1, filePos = -1;
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while ( libIt != Libraries.end() || fileIt != Files.end() ) {
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if (libIt != Libraries.end())
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libPos = Libraries.getPosition(libIt - Libraries.begin());
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else
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libPos = -1;
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if (fileIt != Files.end())
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filePos = Files.getPosition(fileIt - Files.begin());
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else
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filePos = -1;
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if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
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// Add a source file
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Items.push_back(std::make_pair(*fileIt++, false));
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} else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
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// Add a library
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Items.push_back(std::make_pair(*libIt++, true));
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}
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}
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}
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// Rightly this should go in a header file but it just seems such a waste.
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namespace llvm {
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extern void Optimize(Module*);
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}
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int main(int argc, char **argv, char **envp) {
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try {
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// Initial global variable above for convenience printing of program name.
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progname = sys::Path(argv[0]).getBasename();
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Linker TheLinker(progname, OutputFilename, Verbose);
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// Parse the command line options
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cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
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sys::PrintStackTraceOnErrorSignal();
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// Set up the library paths for the Linker
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TheLinker.addPaths(LibPaths);
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TheLinker.addSystemPaths();
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// Remove any consecutive duplicates of the same library...
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Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
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Libraries.end());
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if (LinkAsLibrary) {
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std::vector<sys::Path> Files;
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for (unsigned i = 0; i < InputFilenames.size(); ++i )
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Files.push_back(sys::Path(InputFilenames[i]));
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if (TheLinker.LinkInFiles(Files))
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return 1; // Error already printed
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// The libraries aren't linked in but are noted as "dependent" in the
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// module.
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for (cl::list<std::string>::const_iterator I = Libraries.begin(),
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E = Libraries.end(); I != E ; ++I) {
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TheLinker.getModule()->addLibrary(*I);
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}
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} else {
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// Build a list of the items from our command line
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Linker::ItemList Items;
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Linker::ItemList NativeItems;
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BuildLinkItems(Items, InputFilenames, Libraries);
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// Link all the items together
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if (TheLinker.LinkInItems(Items,NativeItems) )
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return 1;
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}
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std::auto_ptr<Module> Composite(TheLinker.releaseModule());
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// Optimize the module
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Optimize(Composite.get());
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// Generate the bytecode for the optimized module.
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std::string RealBytecodeOutput = OutputFilename;
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if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
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GenerateBytecode(Composite.get(), RealBytecodeOutput);
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// If we are not linking a library, generate either a native executable
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// or a JIT shell script, depending upon what the user wants.
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if (!LinkAsLibrary) {
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// If the user wants to run a post-link optimization, run it now.
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if (!PostLinkOpts.empty()) {
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std::vector<std::string> opts = PostLinkOpts;
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for (std::vector<std::string>::iterator I = opts.begin(),
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E = opts.end(); I != E; ++I) {
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sys::Path prog(*I);
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if (!prog.canExecute()) {
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prog = sys::Program::FindProgramByName(*I);
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if (prog.isEmpty())
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return PrintAndReturn(std::string("Optimization program '") + *I +
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"' is not found or not executable.");
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}
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// Get the program arguments
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sys::Path tmp_output("opt_result");
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if (!tmp_output.createTemporaryFileOnDisk()) {
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return PrintAndReturn(
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"Can't create temporary file for post-link optimization");
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}
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const char* args[4];
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args[0] = I->c_str();
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|
args[1] = RealBytecodeOutput.c_str();
|
|
args[2] = tmp_output.c_str();
|
|
args[3] = 0;
|
|
if (0 == sys::Program::ExecuteAndWait(prog, args)) {
|
|
if (tmp_output.isBytecodeFile()) {
|
|
sys::Path target(RealBytecodeOutput);
|
|
target.eraseFromDisk();
|
|
tmp_output.renamePathOnDisk(target);
|
|
} else
|
|
return PrintAndReturn(
|
|
"Post-link optimization output is not bytecode");
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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
|
|
sys::Path AssemblyFile ( OutputFilename);
|
|
AssemblyFile.appendSuffix("s");
|
|
|
|
// Mark the output files for removal if we get an interrupt.
|
|
sys::RemoveFileOnSignal(AssemblyFile);
|
|
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
|
|
|
|
// Determine the locations of the llc and gcc programs.
|
|
sys::Path llc = FindExecutable("llc", argv[0]);
|
|
if (llc.isEmpty())
|
|
return PrintAndReturn("Failed to find llc");
|
|
|
|
sys::Path gcc = FindExecutable("gcc", argv[0]);
|
|
if (gcc.isEmpty())
|
|
return PrintAndReturn("Failed to find gcc");
|
|
|
|
// Generate an assembly language file for the bytecode.
|
|
if (Verbose) std::cout << "Generating Assembly Code\n";
|
|
GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc);
|
|
if (Verbose) std::cout << "Generating Native Code\n";
|
|
GenerateNative(OutputFilename, AssemblyFile.toString(), Libraries,
|
|
gcc, envp);
|
|
|
|
// Remove the assembly language file.
|
|
AssemblyFile.eraseFromDisk();
|
|
} else if (NativeCBE) {
|
|
sys::Path CFile (OutputFilename);
|
|
CFile.appendSuffix("cbe.c");
|
|
|
|
// Mark the output files for removal if we get an interrupt.
|
|
sys::RemoveFileOnSignal(CFile);
|
|
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
|
|
|
|
// Determine the locations of the llc and gcc programs.
|
|
sys::Path llc = FindExecutable("llc", argv[0]);
|
|
if (llc.isEmpty())
|
|
return PrintAndReturn("Failed to find llc");
|
|
|
|
sys::Path gcc = FindExecutable("gcc", argv[0]);
|
|
if (gcc.isEmpty())
|
|
return PrintAndReturn("Failed to find gcc");
|
|
|
|
// Generate an assembly language file for the bytecode.
|
|
if (Verbose) std::cout << "Generating Assembly Code\n";
|
|
GenerateCFile(CFile.toString(), RealBytecodeOutput, llc);
|
|
if (Verbose) std::cout << "Generating Native Code\n";
|
|
GenerateNative(OutputFilename, CFile.toString(), Libraries, gcc, envp);
|
|
|
|
// Remove the assembly language file.
|
|
CFile.eraseFromDisk();
|
|
|
|
} else {
|
|
EmitShellScript(argv);
|
|
}
|
|
|
|
// Make the script executable...
|
|
sys::Path(OutputFilename).makeExecutableOnDisk();
|
|
|
|
// Make the bytecode file readable and directly executable in LLEE as well
|
|
sys::Path(RealBytecodeOutput).makeExecutableOnDisk();
|
|
sys::Path(RealBytecodeOutput).makeReadableOnDisk();
|
|
}
|
|
|
|
return 0;
|
|
} catch (const std::string& msg) {
|
|
std::cerr << argv[0] << ": " << msg << "\n";
|
|
} catch (...) {
|
|
std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
|
|
}
|
|
return 1;
|
|
}
|