Merge llvm trunk r238337 from ^/vendor/llvm/dist, resolve conflicts, and

preserve our customizations, where necessary.

1 files changed, 55 insertions, 15 deletions

diff --git a/contrib/llvm/tools/llvm-link/llvm-link.cpp b/contrib/llvm/tools/llvm-link/llvm-link.cpp
index 828b9bb8ef70..369f3477fe5c 100644
--- a/contrib/llvm/tools/llvm-link/llvm-link.cpp
+++ b/contrib/llvm/tools/llvm-link/llvm-link.cpp
@@ -13,7 +13,9 @@
 //===----------------------------------------------------------------------===//
 
 #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"
@@ -36,6 +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"));
@@ -57,6 +64,16 @@ 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...
 //
@@ -68,6 +85,9 @@ loadFile(const char *argv0, const std::string &FN, LLVMContext &Context) {
   if (!Result)
     Err.print(argv0, errs());
 
+  Result->materializeMetadata();
+  UpgradeDebugInfo(*Result);
+
   return Result;
 }
 
@@ -92,6 +112,31 @@ static void diagnosticHandler(const DiagnosticInfo &DI) {
   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;
+    }
+
+    if (Verbose)
+      errs() << "Linking in '" << File << "'\n";
+
+    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();
@@ -104,18 +149,13 @@ int main(int argc, char **argv) {
   auto Composite = make_unique<Module>("llvm-link", Context);
   Linker L(Composite.get(), diagnosticHandler);
 
-  for (unsigned i = 0; i < InputFilenames.size(); ++i) {
-    std::unique_ptr<Module> M = loadFile(argv[0], InputFilenames[i], Context);
-    if (!M.get()) {
-      errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n";
-      return 1;
-    }
-
-    if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n";
+  // First add all the regular input files
+  if (!linkFiles(argv[0], Context, L, InputFilenames, false))
+    return 1;
 
-    if (L.linkInModule(M.get()))
-      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;
 
@@ -126,16 +166,16 @@ int main(int argc, char **argv) {
     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();