mirror of
https://github.com/c64scene-ar/llvm-6502.git
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7bf5dfec19
linking the final program to allow smarter optimizations git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2364 91177308-0d34-0410-b5e6-96231b3b80d8
185 lines
6.5 KiB
C++
185 lines
6.5 KiB
C++
//===----------------------------------------------------------------------===//
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// LLVM 'GCCLD' UTILITY
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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 to worried about this.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/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/Transforms/SymbolStripping.h"
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#include "llvm/Transforms/CleanupGCCOutput.h"
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#include "llvm/Transforms/ConstantMerge.h"
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#include "llvm/Transforms/IPO/GlobalDCE.h"
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#include "llvm/Transforms/IPO/Internalize.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include <fstream>
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#include <memory>
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#include <algorithm>
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#include <sys/types.h> // For FileExists
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#include <sys/stat.h>
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cl::StringList InputFilenames("", "Load <arg> files, linking them together",
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cl::OneOrMore);
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cl::String OutputFilename("o", "Override output filename", cl::NoFlags,"a.out");
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cl::Flag Verbose ("v", "Print information about actions taken");
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cl::StringList LibPaths ("L", "Specify a library search path", cl::ZeroOrMore);
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cl::StringList Libraries ("l", "Specify libraries to link to", cl::ZeroOrMore);
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cl::Flag Strip ("s", "Strip symbol info from executable");
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// FileExists - Return true if the specified string is an openable file...
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static inline bool FileExists(const std::string &FN) {
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struct stat StatBuf;
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return stat(FN.c_str(), &StatBuf) != -1;
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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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std::string Filename = FN;
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std::string ErrorMessage;
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unsigned NextLibPathIdx = 0;
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bool FoundAFile = false;
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while (1) {
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if (Verbose) cerr << "Loading '" << Filename << "'\n";
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if (FileExists(Filename)) FoundAFile = true;
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Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
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if (Result) return std::auto_ptr<Module>(Result); // Load successful!
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if (Verbose) {
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cerr << "Error opening bytecode file: '" << Filename << "'";
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if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
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cerr << endl;
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}
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if (NextLibPathIdx == LibPaths.size()) break;
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Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
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}
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if (FoundAFile)
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cerr << "Bytecode file '" << FN << "' corrupt! "
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<< "Use 'gccld -v ...' for more info.\n";
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else
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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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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n",
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cl::EnableSingleLetterArgValue |
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cl::DisableSingleLetterArgGrouping);
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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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if (!Libraries.empty()) {
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// Sort libraries list...
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sort(Libraries.begin(), Libraries.end());
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// Remove duplicate libraries entries...
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Libraries.erase(unique(Libraries.begin(), Libraries.end()),
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Libraries.end());
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// Add all of the libraries to the end of the link line...
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for (unsigned i = 0; i < Libraries.size(); ++i)
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InputFilenames.push_back("lib" + Libraries[i] + ".bc");
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}
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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) cerr << "Linking in '" << InputFilenames[i] << "'\n";
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if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
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cerr << "Error linking in '" << InputFilenames[i] << "': "
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<< ErrorMessage << endl;
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return 1;
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}
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}
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// In addition to just linking the input from GCC, we also want to spiff it up
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// a little bit. Do this now.
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//
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PassManager Passes;
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// Linking modules together can lead to duplicated global constants, only keep
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// one copy of each constant...
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//
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Passes.add(createConstantMergePass());
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// If the -s command line option was specified, strip the symbols out of the
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// resulting program to make it smaller. -s is a GCC option that we are
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// supporting.
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//
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if (Strip)
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Passes.add(createSymbolStrippingPass());
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// Often if the programmer does not specify proper prototypes for the
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// functions they are calling, they end up calling a vararg version of the
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// function that does not get a body filled in (the real function has typed
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// arguments). This pass merges the two functions.
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//
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Passes.add(createFunctionResolvingPass());
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// Now that composite has been compiled, scan through the module, looking for
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// a main function. If main is defined, mark all other functions internal.
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//
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Passes.add(createInternalizePass());
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// Now that we have optimized the program, discard unreachable functions...
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//
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Passes.add(createGlobalDCEPass());
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// Add the pass that writes bytecode to the output file...
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std::ofstream Out((OutputFilename+".bc").c_str());
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if (!Out.good()) {
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cerr << "Error opening '" << OutputFilename << ".bc' for writing!\n";
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return 1;
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}
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Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
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// Make sure that the Out file gets unlink'd from the disk if we get a SIGINT
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RemoveFileOnSignal(OutputFilename+".bc");
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// Run our queue of passes all at once now, efficiently.
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Passes.run(Composite.get());
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Out.close();
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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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cerr << "Error opening '" << OutputFilename << "' for writing!\n";
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return 1;
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}
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Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";
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Out2.close();
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// Make the script executable...
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chmod(OutputFilename.c_str(), 0755);
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return 0;
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}
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