Initial Checkin of gccld

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1578 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 137 insertions, 0 deletions

diff --git a/tools/gccld/Makefile b/tools/gccld/Makefile
new file mode 100644
index 0000000000..2c02ad9e7f
--- /dev/null
+++ b/tools/gccld/Makefile
@@ -0,0 +1,6 @@
+LEVEL = ../..
+
+TOOLNAME = gccld
+USEDLIBS = transforms bcreader bcwriter asmwriter analysis vmcore asmwriter support
+
+include $(LEVEL)/Makefile.common
diff --git a/tools/gccld/gccld.cpp b/tools/gccld/gccld.cpp
new file mode 100644
index 0000000000..cde23f9d28
--- /dev/null
+++ b/tools/gccld/gccld.cpp
@@ -0,0 +1,131 @@
+//===----------------------------------------------------------------------===//
+// LLVM 'GCCLD' UTILITY 
+//
+// This utility is intended to be compatible with GCC, and follows standard
+// system ld conventions.  As such, the default output file is ./a.out.
+// Additionally, this program outputs a shell script that is used to invoke LLI
+// to execute the program.  In this manner, the generated executable (a.out for
+// example), is directly executable, whereas the bytecode file actually lives in
+// the a.out.bc file generated by this program.  Also, Force is on by default.
+//
+// Note that if someone (or a script) deletes the executable program generated,
+// the .bc file will be left around.  Considering that this is a temporary hack,
+// I'm not to worried about this.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Linker.h"
+#include "llvm/Bytecode/Reader.h"
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Module.h"
+#include "llvm/Method.h"
+#include "Support/CommandLine.h"
+#include <fstream>
+#include <memory>
+#include <sys/types.h>     // For FileExists
+#include <sys/stat.h>
+
+
+cl::StringList InputFilenames("", "Load <arg> files, linking them together", 
+			      cl::OneOrMore);
+cl::String OutputFilename("o", "Override output filename", cl::NoFlags,"a.out");
+cl::Flag   Verbose       ("v", "Print information about actions taken");
+cl::StringList LibPaths  ("L", "Specify a library search path", cl::ZeroOrMore);
+cl::StringList Libraries ("l", "Specify libraries to link to", cl::ZeroOrMore);
+
+
+// FileExists - Return true if the specified string is an openable file...
+static inline bool FileExists(const std::string &FN) {
+  struct stat StatBuf;
+  return stat(FN.c_str(), &StatBuf) != -1;
+}
+
+// LoadFile - Read the specified bytecode file in and return it.  This routine
+// searches the link path for the specified file to try to find it...
+//
+static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
+  std::string Filename = FN;
+  std::string ErrorMessage;
+
+  unsigned NextLibPathIdx = 0;
+  bool FoundAFile = false;
+
+  while (1) {
+    if (Verbose) cerr << "Loading '" << Filename << "'\n";
+    if (FileExists(Filename)) FoundAFile = true;
+    Module *Result = ParseBytecodeFile(Filename, &ErrorMessage);
+    if (Result) return std::auto_ptr<Module>(Result);   // Load successful!
+
+    if (Verbose) {
+      cerr << "Error opening bytecode file: '" << Filename << "'";
+      if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
+      cerr << endl;
+    }
+    
+    if (NextLibPathIdx == LibPaths.size()) break;
+    Filename = LibPaths[NextLibPathIdx++] + "/" + FN;
+  }
+
+  if (FoundAFile)
+    cerr << "Bytecode file '" << FN << "' corrupt!  "
+         << "Use 'link -v ...' for more info.\n";
+  else
+    cerr << "Could not locate bytecode file: '" << FN << "'\n";
+  return std::auto_ptr<Module>();
+}
+
+
+
+
+int main(int argc, char **argv) {
+  cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n",
+			      cl::EnableSingleLetterArgValue |
+			      cl::DisableSingleLetterArgGrouping);
+  assert(InputFilenames.size() > 0 && "OneOrMore is not working");
+
+  unsigned BaseArg = 0;
+  std::string ErrorMessage;
+
+  if (!Libraries.empty())
+    cerr << "LLVM Linker Warning:  Linking to libraries is unimplemented!\n";
+
+  std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
+  if (Composite.get() == 0) return 1;
+
+  for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
+    std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
+    if (M.get() == 0) return 1;
+
+    if (Verbose) cerr << "Linking in '" << InputFilenames[i] << "'\n";
+
+    if (LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
+      cerr << "Error linking in '" << InputFilenames[i] << "': "
+	   << ErrorMessage << endl;
+      return 1;
+    }
+  }
+
+  std::ofstream Out((OutputFilename+".bc").c_str());
+  if (!Out.good()) {
+    cerr << "Error opening '" << OutputFilename << ".bc' for writing!\n";
+    return 1;
+  }
+
+  if (Verbose) cerr << "Writing bytecode...\n";
+  WriteBytecodeToFile(Composite.get(), Out);
+  Out.close();
+
+  // Output the script to start the program...
+  std::ofstream Out2(OutputFilename.c_str());
+  if (!Out2.good()) {
+    cerr << "Error openeing '" << OutputFilename << "' for writing!\n";
+    return 1;
+  }
+  Out2 << "#!/bin/sh\nlli -q $0.bc\n";
+  Out2.close();
+  
+  // Make the script executable...
+  chmod(OutputFilename.c_str(), 0755);
+
+  return 0;
+}