mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16287 91177308-0d34-0410-b5e6-96231b3b80d8
270 lines
8.3 KiB
C++
270 lines
8.3 KiB
C++
//===- llvm-link.cpp - Low-level LLVM 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 may be invoked in the following manner:
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// llvm-link a.bc b.bc c.bc -o x.bc
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/Analysis/Verifier.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/Support/Linker.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/System/Path.h"
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#include "llvm/ADT/SetVector.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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static cl::list<std::string>
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InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bytecode files>"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
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cl::value_desc("filename"));
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static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool>
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Verbose("v", cl::desc("Print information about actions taken"));
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static cl::opt<bool>
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DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
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static cl::list<std::string>
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LibPaths("L", cl::desc("Specify a library search path"), cl::ZeroOrMore,
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cl::value_desc("directory"), cl::Prefix);
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static cl::list<std::string>
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Libraries("l", cl::desc("Specify library names to link with"), cl::ZeroOrMore,
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cl::Prefix, cl::value_desc("library name"));
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// GetModule - This function is just factored out of the functions below
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static inline Module* GetModule(const sys::Path& Filename) {
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if (Verbose) std::cerr << "Loading '" << Filename.c_str() << "'\n";
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std::string ErrorMessage;
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if (Filename.exists()) {
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Module* Result = ParseBytecodeFile(Filename.get(), &ErrorMessage);
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if (Result) return Result; // Load successful!
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if (Verbose) {
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std::cerr << "Error opening bytecode file: '" << Filename.c_str() << "'";
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if (ErrorMessage.size()) std::cerr << ": " << ErrorMessage;
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std::cerr << "\n";
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}
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} else {
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std::cerr << "Bytecode file: '" << Filename.c_str()
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<< "' does not exist.\n";
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}
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return 0;
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}
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// LoadFile - Read the specified bytecode file in and return it. This routine
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// searches the link path for the specified file to try to find it...
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//
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static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
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sys::Path Filename;
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if (!Filename.set_file(FN)) {
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std::cerr << "Invalid file name: '" << Filename.c_str() << "'\n";
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return std::auto_ptr<Module>();
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}
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if (Module* Result = GetModule(Filename))
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return std::auto_ptr<Module>(Result);
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bool FoundAFile = false;
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for (unsigned i = 0; i < LibPaths.size(); i++) {
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if (!Filename.set_directory(LibPaths[i])) {
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std::cerr << "Invalid library path: '" << LibPaths[i] << "'\n";
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} else if (!Filename.append_file(FN)) {
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std::cerr << "Invalid library path: '" << LibPaths[i]
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<< "/" << FN.c_str() << "'\n";
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} else if (Filename.exists()) {
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FoundAFile = true;
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if (Module *Result = GetModule(Filename))
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return std::auto_ptr<Module>(Result); // Load successful!
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}
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}
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if (FoundAFile)
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std::cerr << "Bytecode file '" << FN << "' corrupt! "
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<< "Use 'llvm-link -v ...' for more info.\n";
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else
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std::cerr << "Could not locate bytecode file: '" << FN << "'\n";
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return std::auto_ptr<Module>();
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}
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sys::Path GetPathForLinkageItem(const std::string& link_item,
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const std::string& dir) {
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sys::Path fullpath;
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fullpath.set_directory(dir);
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// Try *.o
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fullpath.append_file(link_item);
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fullpath.append_suffix("o");
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if (fullpath.readable())
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return fullpath;
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// Try *.bc
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fullpath.elide_suffix();
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fullpath.append_suffix("bc");
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if (fullpath.readable())
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return fullpath;
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// Try *.so
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fullpath.elide_suffix();
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fullpath.append_suffix(sys::Path::GetDLLSuffix());
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if (fullpath.readable())
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return fullpath;
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// Try lib*.a
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fullpath.set_directory(dir);
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fullpath.append_file(std::string("lib") + link_item);
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fullpath.append_suffix("a");
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if (fullpath.readable())
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return fullpath;
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// Didn't find one.
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fullpath.clear();
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return fullpath;
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}
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static inline bool LoadLibrary(const std::string &FN, Module*& Result) {
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Result = 0;
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sys::Path Filename;
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if (!Filename.set_file(FN)) {
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return false;
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}
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if (Filename.readable() && Filename.is_bytecode_file()) {
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if (Result = GetModule(Filename))
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return true;
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}
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bool foundAFile = false;
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for (unsigned I = 0; I < LibPaths.size(); I++) {
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sys::Path path = GetPathForLinkageItem(FN,LibPaths[I]);
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if (!path.is_empty()) {
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if (path.is_bytecode_file()) {
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if (Result = GetModule(path)) {
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return true;
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} else {
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// We found file but its not a valid bytecode file so we
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// return false and leave Result null.
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return false;
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}
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} else {
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// We found a file, but its not a bytecode file so we return
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// false and leave Result null.
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return false;
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}
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}
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}
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// We didn't find a file so we leave Result null and return
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// false to indicate that the library should be just left in the
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// emitted module as resolvable at runtime.
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return false;
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}
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
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sys::PrintStackTraceOnErrorSignal();
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assert(InputFilenames.size() > 0 && "OneOrMore is not working");
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unsigned BaseArg = 0;
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std::string ErrorMessage;
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std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
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if (Composite.get() == 0) return 1;
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for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
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std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
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if (M.get() == 0) return 1;
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if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
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std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
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<< "': " << ErrorMessage << "\n";
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return 1;
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}
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}
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// Get the list of dependent libraries from the composite module
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const Module::LibraryListType& libs = Composite.get()->getLibraries();
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// Iterate over the list of dependent libraries, linking them in as we
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// find them
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Module::LibraryListType::const_iterator I = libs.begin();
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while (I != libs.end()) {
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Module* Mod = 0;
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if (LoadLibrary(*I,Mod)) {
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if (Mod != 0) {
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std::auto_ptr<Module> M(Mod);
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
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std::cerr << argv[0] << ": link error in '" << *I
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<< "': " << ErrorMessage << "\n";
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return 1;
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}
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} else {
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std::cerr << argv[0] << ": confused loading library '" << *I
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<< "'. Aborting\n";
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return 2;
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}
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}
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++I;
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}
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// TODO: Iterate over the -l list and link in any modules containing
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// global symbols that have not been resolved so far.
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if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
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std::ostream *Out = &std::cout; // Default to printing to stdout...
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if (OutputFilename != "-") {
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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std::cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
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return 1;
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}
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// Make sure that the Out file gets unlinked from the disk if we get a
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// SIGINT
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sys::RemoveFileOnSignal(OutputFilename);
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}
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if (verifyModule(*Composite.get())) {
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std::cerr << argv[0] << ": linked module is broken!\n";
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return 1;
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}
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if (Verbose) std::cerr << "Writing bytecode...\n";
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WriteBytecodeToFile(Composite.get(), *Out);
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if (Out != &std::cout) delete Out;
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return 0;
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}
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