MC CFG: Add an MCObjectSymbolizer in the MCObjectDisassembler.

Used to detect calls to function symbol stubs (future commit).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188887 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCObjectDisassembler.h

@@ -31,6 +31,7 @@ class MCDisassembler;
 class MCFunction;
 class MCInstrAnalysis;
 class MCModule;
+class MCObjectSymbolizer;
 
 /// \brief Disassemble an ObjectFile to an MCModule and MCFunctions.
 /// This class builds on MCDisassembler to disassemble whole sections, creating
@@ -54,6 +55,13 @@ public:
 
   MCModule *buildEmptyModule();
 
+  /// \brief Set the symbolizer to use to get information on external functions.
+  /// Note that this isn't used to do instruction-level symbolization (that is,
+  /// plugged into MCDisassembler), but to symbolize function call targets.
+  void setSymbolizer(MCObjectSymbolizer *ObjectSymbolizer) {
+    MOS = ObjectSymbolizer;
+  }
+
   /// \brief Get the effective address of the entrypoint, or 0 if there is none.
   virtual uint64_t getEntrypoint();
 
@@ -86,6 +94,7 @@ protected:
   const object::ObjectFile &Obj;
   const MCDisassembler &Dis;
   const MCInstrAnalysis &MIA;
+  MCObjectSymbolizer *MOS;
 
 private:
   /// \brief Fill \p Module by creating an atom for each section.

lib/MC/MCObjectDisassembler.cpp

@@ -18,6 +18,7 @@
 #include "llvm/MC/MCFunction.h"
 #include "llvm/MC/MCInstrAnalysis.h"
 #include "llvm/MC/MCModule.h"
+#include "llvm/MC/MCObjectSymbolizer.h"
 #include "llvm/Object/MachO.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Debug.h"
@@ -34,7 +35,7 @@ using namespace object;
 MCObjectDisassembler::MCObjectDisassembler(const ObjectFile &Obj,
                                            const MCDisassembler &Dis,
                                            const MCInstrAnalysis &MIA)
-  : Obj(Obj), Dis(Dis), MIA(MIA) {}
+    : Obj(Obj), Dis(Dis), MIA(MIA), MOS(0) {}
 
 uint64_t MCObjectDisassembler::getEntrypoint() {
   error_code ec;