X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Fllvm-link%2Fllvm-link.cpp;h=369f3477fe5c99434cd1ce74d1c3b40ba6cf7292;hb=60dbe0fd0dbb5f52411a399480b2b8066839de37;hp=d8d7534e5c73c98d11f2c49fb775ff29898ed691;hpb=d5bf07b4667c7381fcd375b186e95436b32b90e6;p=oota-llvm.git

diff --git a/tools/llvm-link/llvm-link.cpp b/tools/llvm-link/llvm-link.cpp
index d8d7534e5c7..369f3477fe5 100644
--- a/tools/llvm-link/llvm-link.cpp
+++ b/tools/llvm-link/llvm-link.cpp
@@ -12,13 +12,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Linker.h"
-#include "llvm/Analysis/Verifier.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IR/AutoUpgrade.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
@@ -33,6 +38,11 @@ static cl::list<std::string>
 InputFilenames(cl::Positional, cl::OneOrMore,
                cl::desc("<input bitcode files>"));
 
+static cl::list<std::string> OverridingInputs(
+    "override", cl::ZeroOrMore, cl::value_desc("filename"),
+    cl::desc(
+        "input bitcode file which can override previously defined symbol(s)"));
+
 static cl::opt<std::string>
 OutputFilename("o", cl::desc("Override output filename"), cl::init("-"),
                cl::value_desc("filename"));
@@ -50,79 +60,122 @@ Verbose("v", cl::desc("Print information about actions taken"));
 static cl::opt<bool>
 DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden);
 
-// LoadFile - Read the specified bitcode file in and return it.  This routine
-// searches the link path for the specified file to try to find it...
+static cl::opt<bool>
+SuppressWarnings("suppress-warnings", cl::desc("Suppress all linking warnings"),
+                 cl::init(false));
+
+static cl::opt<bool> PreserveBitcodeUseListOrder(
+    "preserve-bc-uselistorder",
+    cl::desc("Preserve use-list order when writing LLVM bitcode."),
+    cl::init(true), cl::Hidden);
+
+static cl::opt<bool> PreserveAssemblyUseListOrder(
+    "preserve-ll-uselistorder",
+    cl::desc("Preserve use-list order when writing LLVM assembly."),
+    cl::init(false), cl::Hidden);
+
+// Read the specified bitcode file in and return it. This routine searches the
+// link path for the specified file to try to find it...
 //
-static inline Module *LoadFile(const char *argv0, const std::string &FN,
-                               LLVMContext& Context) {
+static std::unique_ptr<Module>
+loadFile(const char *argv0, const std::string &FN, LLVMContext &Context) {
   SMDiagnostic Err;
   if (Verbose) errs() << "Loading '" << FN << "'\n";
-  Module* Result = 0;
+  std::unique_ptr<Module> Result = getLazyIRFileModule(FN, Err, Context);
+  if (!Result)
+    Err.print(argv0, errs());
+
+  Result->materializeMetadata();
+  UpgradeDebugInfo(*Result);
+
+  return Result;
+}
+
+static void diagnosticHandler(const DiagnosticInfo &DI) {
+  unsigned Severity = DI.getSeverity();
+  switch (Severity) {
+  case DS_Error:
+    errs() << "ERROR: ";
+    break;
+  case DS_Warning:
+    if (SuppressWarnings)
+      return;
+    errs() << "WARNING: ";
+    break;
+  case DS_Remark:
+  case DS_Note:
+    llvm_unreachable("Only expecting warnings and errors");
+  }
+
+  DiagnosticPrinterRawOStream DP(errs());
+  DI.print(DP);
+  errs() << '\n';
+}
+
+static bool linkFiles(const char *argv0, LLVMContext &Context, Linker &L,
+                      const cl::list<std::string> &Files,
+                      bool OverrideDuplicateSymbols) {
+  for (const auto &File : Files) {
+    std::unique_ptr<Module> M = loadFile(argv0, File, Context);
+    if (!M.get()) {
+      errs() << argv0 << ": error loading file '" << File << "'\n";
+      return false;
+    }
+
+    if (verifyModule(*M, &errs())) {
+      errs() << argv0 << ": " << File << ": error: input module is broken!\n";
+      return false;
+    }
 
-  Result = ParseIRFile(FN, Err, Context);
-  if (Result) return Result;   // Load successful!
+    if (Verbose)
+      errs() << "Linking in '" << File << "'\n";
 
-  Err.print(argv0, errs());
-  return NULL;
+    if (L.linkInModule(M.get(), OverrideDuplicateSymbols))
+      return false;
+  }
+
+  return true;
 }
 
 int main(int argc, char **argv) {
   // Print a stack trace if we signal out.
   sys::PrintStackTraceOnErrorSignal();
   PrettyStackTraceProgram X(argc, argv);
-  
+
   LLVMContext &Context = getGlobalContext();
   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
   cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
 
-  unsigned BaseArg = 0;
-  std::string ErrorMessage;
+  auto Composite = make_unique<Module>("llvm-link", Context);
+  Linker L(Composite.get(), diagnosticHandler);
 
-  OwningPtr<Module> Composite(LoadFile(argv[0],
-                                       InputFilenames[BaseArg], Context));
-  if (Composite.get() == 0) {
-    errs() << argv[0] << ": error loading file '"
-           << InputFilenames[BaseArg] << "'\n";
+  // First add all the regular input files
+  if (!linkFiles(argv[0], Context, L, InputFilenames, false))
     return 1;
-  }
 
-  Linker L(Composite.get());
-  for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
-    OwningPtr<Module> M(LoadFile(argv[0], InputFilenames[i], Context));
-    if (M.get() == 0) {
-      errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
-      return 1;
-    }
-
-    if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
-
-    if (L.linkInModule(M.get(), &ErrorMessage)) {
-      errs() << argv[0] << ": link error in '" << InputFilenames[i]
-             << "': " << ErrorMessage << "\n";
-      return 1;
-    }
-  }
+  // Next the -override ones.
+  if (!linkFiles(argv[0], Context, L, OverridingInputs, true))
+    return 1;
 
   if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite;
 
-  std::string ErrorInfo;
-  tool_output_file Out(OutputFilename.c_str(), ErrorInfo,
-                       raw_fd_ostream::F_Binary);
-  if (!ErrorInfo.empty()) {
-    errs() << ErrorInfo << '\n';
+  std::error_code EC;
+  tool_output_file Out(OutputFilename, EC, sys::fs::F_None);
+  if (EC) {
+    errs() << EC.message() << '\n';
     return 1;
   }
 
-  if (verifyModule(*Composite)) {
-    errs() << argv[0] << ": linked module is broken!\n";
+  if (verifyModule(*Composite, &errs())) {
+    errs() << argv[0] << ": error: linked module is broken!\n";
     return 1;
   }
 
   if (Verbose) errs() << "Writing bitcode...\n";
   if (OutputAssembly) {
-    Out.os() << *Composite;
+    Composite->print(Out.os(), nullptr, PreserveAssemblyUseListOrder);
   } else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true))
-    WriteBitcodeToFile(Composite.get(), Out.os());
+    WriteBitcodeToFile(Composite.get(), Out.os(), PreserveBitcodeUseListOrder);
 
   // Declare success.
   Out.keep();