Convert to use new Pass framework...

[oota-llvm.git] / tools / llvm-link / llvm-link.cpp

diff --git a/tools/llvm-link/llvm-link.cpp b/tools/llvm-link/llvm-link.cpp
index 0ae39228d9cbbe060b849449e678c3cbf699c7a6..bdd04685ce3a7bdc24737f98a1c94e6ae9e2910f 100644 (file)
--- a/tools/llvm-link/llvm-link.cpp
+++ b/tools/llvm-link/llvm-link.cpp
@@ -5,7 +5,7 @@
 //  link a.bc b.bc c.bc -o x.bc
 //
 // Alternatively, this can be used as an 'ar' tool as well.  If invoked as
-// either 'ar' or 'llvm-ar', it accepts a 'cr' parameter as well.
+// either 'ar' or 'llvm-ar', it accepts a 'rc' parameter as well.
 //
 //===----------------------------------------------------------------------===//
 
@@ -13,11 +13,13 @@
 #include "llvm/Bytecode/Reader.h"
 #include "llvm/Bytecode/Writer.h"
 #include "llvm/Assembly/Writer.h"
-#include "llvm/Support/CommandLine.h"
 #include "llvm/Module.h"
 #include "llvm/Method.h"
-#include <fstream.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", 
@@ -26,34 +28,78 @@ cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "-");
 cl::Flag   Force         ("f", "Overwrite output files", cl::NoFlags, false);
 cl::Flag   Verbose       ("v", "Print information about actions taken");
 cl::Flag   DumpAsm       ("d", "Print assembly as linked", cl::Hidden, false);
+cl::StringList LibPaths  ("L", "Specify a library search path", cl::ZeroOrMore);
+cl::StringList Libraries ("l", "Specify libraries to link to", cl::ZeroOrMore);
 
 
-int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
-  assert(InputFilenames.size() > 0 && "OneOrMore is not working");
+// 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;
+}
 
-  // TODO: TEST argv[0]
-  string ErrorMessage;
-    
-  if (Verbose) cerr << "Loading '" << InputFilenames[0] << "'\n";
-  std::auto_ptr<Module> Composite(ParseBytecodeFile(InputFilenames[0],
-                                                    &ErrorMessage));
-  if (Composite.get() == 0) {
-    cerr << "Error opening bytecode file: '" << InputFilenames[0] << "'";
-    if (ErrorMessage.size()) cerr << ": " << ErrorMessage;
-    cerr << endl;
-    return 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;
 
-  for (unsigned i = 1; i < InputFilenames.size(); ++i) {
-  if (Verbose) cerr << "Loading '" << InputFilenames[i] << "'\n";
-    auto_ptr<Module> M(ParseBytecodeFile(InputFilenames[i], &ErrorMessage));
-    if (M.get() == 0) {
-      cerr << "Error opening bytecode file: '" << InputFilenames[i] << "'";
+  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;
-      return 1;
     }
+    
+    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\n",
+                             cl::EnableSingleLetterArgValue |
+                             cl::DisableSingleLetterArgGrouping);
+  assert(InputFilenames.size() > 0 && "OneOrMore is not working");
+
+  unsigned BaseArg = 0;
+  std::string ErrorMessage;
+
+  // TODO: TEST argv[0] for llvm-ar forms... for now, this is a huge hack.
+  if (InputFilenames.size() >= 3 && InputFilenames[0] == "rc" &&
+      OutputFilename == "-") {
+    BaseArg = 2;
+    OutputFilename = InputFilenames[1];
+  }
+
+  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";
 
@@ -69,8 +115,13 @@ int main(int argc, char **argv) {
 
   ostream *Out = &cout;  // Default to printing to stdout...
   if (OutputFilename != "-") {
-    Out = new ofstream(OutputFilename.c_str(), 
-                      (Force ? 0 : ios::noreplace)|ios::out);
+    if (!Force && std::ifstream(OutputFilename.c_str())) {
+      // If force is not specified, make sure not to overwrite a file!
+      cerr << "Error opening '" << OutputFilename << "': File exists!\n"
+           << "Use -f command line argument to force output\n";
+      return 1;
+    }
+    Out = new std::ofstream(OutputFilename.c_str());
     if (!Out->good()) {
       cerr << "Error opening '" << OutputFilename << "'!\n";
       return 1;
@@ -80,6 +131,6 @@ int main(int argc, char **argv) {
   if (Verbose) cerr << "Writing bytecode...\n";
   WriteBytecodeToFile(Composite.get(), *Out);
 
-  if (Out != &cout) delete Out;
+  if (Out != &std::cout) delete Out;
   return 0;
 }