Add a WITH_CLANG_EXTRAS option for src.conf(5), disabled by default,

that builds the following additional llvm/clang tools:

- bugpoint
- llc
- lli
- llvm-ar
- llvm-as
- llvm-bcanalyzer
- llvm-diff
- llvm-dis
- llvm-extract
- llvm-ld
- llvm-link
- llvm-mc
- llvm-nm
- llvm-objdump
- llvm-prof
- llvm-ranlib
- llvm-rtdyld
- llvm-stub
- macho-dump
- opt

These tools are mainly useful for people that want to manipulate llvm
bitcode (.bc) and llvm assembly language (.ll) files, or want to tinker
with llvm and clang themselves.

MFC after:	2 weeks

1 files changed, 91 insertions, 0 deletions

diff --git a/contrib/llvm/tools/llvm-diff/DifferenceEngine.h b/contrib/llvm/tools/llvm-diff/DifferenceEngine.h
new file mode 100644
index 0000000..5b4f80b
--- /dev/null
+++ b/contrib/llvm/tools/llvm-diff/DifferenceEngine.h
@@ -0,0 +1,91 @@
+//===-- DifferenceEngine.h - Module comparator ------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines the interface to the LLVM difference engine,
+// which structurally compares functions within a module.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LLVM_DIFFERENCE_ENGINE_H_
+#define _LLVM_DIFFERENCE_ENGINE_H_
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "DiffLog.h"
+#include "DiffConsumer.h"
+
+#include <utility>
+
+namespace llvm {
+  class Function;
+  class GlobalValue;
+  class Instruction;
+  class LLVMContext;
+  class Module;
+  class Twine;
+  class Value;
+
+  /// A class for performing structural comparisons of LLVM assembly.
+  class DifferenceEngine {
+  public:
+    /// A RAII object for recording the current context.
+    struct Context {
+      Context(DifferenceEngine &Engine, Value *L, Value *R) : Engine(Engine) {
+        Engine.consumer.enterContext(L, R);
+      }
+
+      ~Context() {
+        Engine.consumer.exitContext();
+      }
+
+    private:
+      DifferenceEngine &Engine;
+    };
+
+    /// An oracle for answering whether two values are equivalent as
+    /// operands.
+    struct Oracle {
+      virtual bool operator()(Value *L, Value *R) = 0;
+
+    protected:
+      virtual ~Oracle() {}
+    };
+
+    DifferenceEngine(LLVMContext &context, Consumer &consumer)
+      : context(context), consumer(consumer), globalValueOracle(0) {}
+
+    void diff(Module *L, Module *R);
+    void diff(Function *L, Function *R);
+    void log(StringRef text) {
+      consumer.log(text);
+    }
+    LogBuilder logf(StringRef text) {
+      return LogBuilder(consumer, text);
+    }
+    Consumer& getConsumer() const { return consumer; }
+
+    /// Installs an oracle to decide whether two global values are
+    /// equivalent as operands.  Without an oracle, global values are
+    /// considered equivalent as operands precisely when they have the
+    /// same name.
+    void setGlobalValueOracle(Oracle *oracle) {
+      globalValueOracle = oracle;
+    }
+
+    /// Determines whether two global values are equivalent.
+    bool equivalentAsOperands(GlobalValue *L, GlobalValue *R);
+
+  private:
+    LLVMContext &context;
+    Consumer &consumer;
+    Oracle *globalValueOracle;
+  };
+}
+
+#endif