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https://github.com/c64scene-ar/llvm-6502.git
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837149c08d
ensure that -L paths don't contain both bytecode and native libraries. This patch contributed by Adam Treat. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20370 91177308-0d34-0410-b5e6-96231b3b80d8
370 lines
14 KiB
C++
370 lines
14 KiB
C++
//===- gccld.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 "gccld.h"
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#include "llvm/Linker.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/WriteBytecodePass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.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/System/Signals.h"
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#include "llvm/Support/SystemUtils.h"
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#include <fstream>
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#include <memory>
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using namespace llvm;
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namespace {
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cl::list<std::string>
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InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
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cl::OneOrMore);
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cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
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cl::value_desc("filename"));
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cl::opt<bool>
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Verbose("v", cl::desc("Print information about actions taken"));
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cl::list<std::string>
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LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
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cl::value_desc("directory"));
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cl::list<std::string>
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Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
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cl::value_desc("library prefix"));
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cl::opt<bool>
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Strip("strip-all", cl::desc("Strip all symbol info from executable"));
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cl::opt<bool>
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StripDebug("strip-debug",
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cl::desc("Strip debugger symbol info from executable"));
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cl::opt<bool>
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NoInternalize("disable-internalize",
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cl::desc("Do not mark all symbols as internal"));
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cl::alias
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ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
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cl::aliasopt(NoInternalize));
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cl::opt<bool>
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LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
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" library, not an executable"));
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cl::alias
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Relink("r", cl::desc("Alias for -link-as-library"),
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cl::aliasopt(LinkAsLibrary));
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cl::opt<bool>
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Native("native",
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cl::desc("Generate a native binary instead of a shell script"));
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cl::opt<bool>
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NativeCBE("native-cbe",
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cl::desc("Generate a native binary with the C backend and GCC"));
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cl::opt<std::string>
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RPath("rpath",
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cl::desc("Set runtime shared library search path (requires -native or"
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" -native-cbe)"),
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cl::Prefix, cl::value_desc("directory"));
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cl::opt<std::string>
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SOName("soname",
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cl::desc("Set internal name of shared library (requires -native or"
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" -native-cbe)"),
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cl::Prefix, cl::value_desc("name"));
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// Compatibility options that are ignored but supported by LD
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cl::opt<std::string>
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CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<bool>
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CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::opt<std::string>
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CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
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cl::alias A0("s", cl::desc("Alias for --strip-all"),
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cl::aliasopt(Strip));
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cl::alias A1("S", cl::desc("Alias for --strip-debug"),
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cl::aliasopt(StripDebug));
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}
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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 char *progname, 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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/// 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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std::string llvmstub = FindExecutable("llvm-stub.exe", argv[0]).toString();
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if (llvmstub.empty()) {
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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), sys::Path(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(argv[0], "error opening '" + OutputFilename +
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"' 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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// 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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int main(int argc, char **argv, char **envp ) {
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cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
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sys::PrintStackTraceOnErrorSignal();
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int exitCode = 0;
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std::string ProgName = sys::Path(argv[0]).getBasename();
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Linker TheLinker(ProgName, Verbose);
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try {
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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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TheLinker.addPaths(LibPaths);
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TheLinker.addSystemPaths();
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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 by linker
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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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BuildLinkItems(Items, InputFilenames, Libraries);
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// Link all the items together
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if (TheLinker.LinkInItems(Items))
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return 1; // Error already printed
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}
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// We're done with the Linker, so tell it to release its module
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std::auto_ptr<Module> Composite(TheLinker.releaseModule());
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// Create the output file.
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std::string RealBytecodeOutput = OutputFilename;
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if (!LinkAsLibrary || Native || NativeCBE) RealBytecodeOutput += ".bc";
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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(RealBytecodeOutput.c_str(), io_mode);
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if (!Out.good())
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return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
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"' for writing!");
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// Ensure that the bytecode file gets removed from the disk if we get a
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// SIGINT signal.
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sys::RemoveFileOnSignal(sys::Path(RealBytecodeOutput));
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// Strip everything if Strip is set, otherwise if stripdebug is set, just
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// strip debug info.
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int StripLevel = Strip ? 2 : (StripDebug ? 1 : 0);
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// Internalize the module if neither -disable-internalize nor
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// -link-as-library are passed in.
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bool ShouldInternalize = !NoInternalize & !LinkAsLibrary;
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// Generate the bytecode file.
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if (GenerateBytecode(Composite.get(), StripLevel, ShouldInternalize, &Out)){
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Out.close();
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return PrintAndReturn(argv[0], "error generating bytecode");
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}
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// Close the bytecode file.
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Out.close();
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// Generate either a native file or a JIT shell script. If the user wants
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// to generate a native file, compile it from the bytecode file. Otherwise,
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// if the target is not a library, create a script that will run the
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// bytecode through the JIT.
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if (Native) {
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// Name of the Assembly Language output file
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sys::Path AssemblyFile (OutputFilename);
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AssemblyFile.appendSuffix("s");
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// Mark the output files for removal if we get an interrupt.
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sys::RemoveFileOnSignal(AssemblyFile);
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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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// Determine the locations of the llc and gcc programs.
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sys::Path llc = FindExecutable("llc", argv[0]);
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if (llc.isEmpty())
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return PrintAndReturn(argv[0], "Failed to find llc");
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sys::Path gcc = FindExecutable("gcc", argv[0]);
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if (gcc.isEmpty())
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return PrintAndReturn(argv[0], "Failed to find gcc");
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// Generate an assembly language file for the bytecode.
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if (Verbose) std::cout << "Generating Assembly Code\n";
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GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc);
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if (Verbose) std::cout << "Generating Native Code\n";
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GenerateNative(OutputFilename, AssemblyFile.toString(),
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LibPaths, Libraries, gcc, envp, LinkAsLibrary, RPath,
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SOName );
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// Remove the assembly language file.
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AssemblyFile.destroyFile();
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// Remove the bytecode language file.
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sys::Path(RealBytecodeOutput).destroyFile();
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} else if (NativeCBE) {
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sys::Path CFile (OutputFilename);
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CFile.appendSuffix("cbe.c");
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// Mark the output files for removal if we get an interrupt.
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sys::RemoveFileOnSignal(CFile);
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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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// Determine the locations of the llc and gcc programs.
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sys::Path llc = FindExecutable("llc", argv[0]);
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if (llc.isEmpty())
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return PrintAndReturn(argv[0], "Failed to find llc");
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sys::Path gcc = FindExecutable("gcc", argv[0]);
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if (gcc.isEmpty())
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return PrintAndReturn(argv[0], "Failed to find gcc");
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// Generate an assembly language file for the bytecode.
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if (Verbose) std::cout << "Generating Assembly Code\n";
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GenerateCFile(CFile.toString(), RealBytecodeOutput, llc);
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if (Verbose) std::cout << "Generating Native Code\n";
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GenerateNative(OutputFilename, CFile.toString(),
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LibPaths, Libraries, gcc, envp, LinkAsLibrary, RPath,
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SOName );
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// Remove the assembly language file.
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CFile.destroyFile();
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// Remove the bytecode language file.
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sys::Path(RealBytecodeOutput).destroyFile();
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} else if (!LinkAsLibrary) {
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EmitShellScript(argv);
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// Make the bytecode file readable and directly executable in LLEE
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sys::Path(RealBytecodeOutput).makeExecutable();
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sys::Path(RealBytecodeOutput).makeReadable();
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}
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// Make the output, whether native or script, executable as well...
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sys::Path(OutputFilename).makeExecutable();
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} catch (const char*msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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exitCode = 1;
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} catch (const std::string& msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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exitCode = 2;
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} catch (...) {
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// This really shouldn't happen, but just in case ....
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std::cerr << argv[0] << ": An unexpected unknown exception occurred.\n";
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exitCode = 3;
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}
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return exitCode;
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}
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