1 files changed, 98 insertions, 0 deletions
diff --git a/contrib/llvm/tools/llvm-diff/llvm-diff.cpp b/contrib/llvm/tools/llvm-diff/llvm-diff.cpp
new file mode 100644
index 0000000..774169b
--- /dev/null
+++ b/contrib/llvm/tools/llvm-diff/llvm-diff.cpp
@@ -0,0 +1,98 @@
+//===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the command-line driver for the difference engine.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DiffLog.h"
+#include "DifferenceEngine.h"
+
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Type.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/IRReader.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/SourceMgr.h"
+
+#include <string>
+#include <utility>
+
+
+using namespace llvm;
+
+/// Reads a module from a file.  On error, messages are written to stderr
+/// and null is returned.
+static Module *ReadModule(LLVMContext &Context, StringRef Name) {
+  SMDiagnostic Diag;
+  Module *M = ParseIRFile(Name, Diag, Context);
+  if (!M)
+    Diag.print("llvm-diff", errs());
+  return M;
+}
+
+static void diffGlobal(DifferenceEngine &Engine, Module *L, Module *R,
+                       StringRef Name) {
+  // Drop leading sigils from the global name.
+  if (Name.startswith("@")) Name = Name.substr(1);
+
+  Function *LFn = L->getFunction(Name);
+  Function *RFn = R->getFunction(Name);
+  if (LFn && RFn)
+    Engine.diff(LFn, RFn);
+  else if (!LFn && !RFn)
+    errs() << "No function named @" << Name << " in either module\n";
+  else if (!LFn)
+    errs() << "No function named @" << Name << " in left module\n";
+  else
+    errs() << "No function named @" << Name << " in right module\n";
+}
+
+static cl::opt<std::string> LeftFilename(cl::Positional,
+                                         cl::desc("<first file>"),
+                                         cl::Required);
+static cl::opt<std::string> RightFilename(cl::Positional,
+                                          cl::desc("<second file>"),
+                                          cl::Required);
+static cl::list<std::string> GlobalsToCompare(cl::Positional,
+                                              cl::desc("<globals to compare>"));
+
+int main(int argc, char **argv) {
+  cl::ParseCommandLineOptions(argc, argv);
+
+  LLVMContext Context;
+  
+  // Load both modules.  Die if that fails.
+  Module *LModule = ReadModule(Context, LeftFilename);
+  Module *RModule = ReadModule(Context, RightFilename);
+  if (!LModule || !RModule) return 1;
+
+  DiffConsumer Consumer(LModule, RModule);
+  DifferenceEngine Engine(Context, Consumer);
+
+  // If any global names were given, just diff those.
+  if (!GlobalsToCompare.empty()) {
+    for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I)
+      diffGlobal(Engine, LModule, RModule, GlobalsToCompare[I]);
+
+  // Otherwise, diff everything in the module.
+  } else {
+    Engine.diff(LModule, RModule);
+  }
+
+  delete LModule;
+  delete RModule;
+
+  return Consumer.hadDifferences();
+}