remove klee_alias_function()

this function can be used to modify the control flow of the program
on different paths, enabling self-modifying code.

3 files changed, 0 insertions, 24 deletions

diff --git a/lib/Core/ExecutionState.cpp b/lib/Core/ExecutionState.cpp
index 70d5d21c..48154383 100644
--- a/lib/Core/ExecutionState.cpp
+++ b/lib/Core/ExecutionState.cpp
@@ -173,14 +173,6 @@ std::string ExecutionState::getFnAlias(std::string fn) {
   else return "";
 }
 
-void ExecutionState::addFnAlias(std::string old_fn, std::string new_fn) {
-  fnAliases[old_fn] = new_fn;
-}
-
-void ExecutionState::removeFnAlias(std::string fn) {
-  fnAliases.erase(fn);
-}
-
 /**/
 
 llvm::raw_ostream &klee::operator<<(llvm::raw_ostream &os, const MemoryMap &mm) {
diff --git a/lib/Core/SpecialFunctionHandler.cpp b/lib/Core/SpecialFunctionHandler.cpp
index e18d3534..231bd88d 100644
--- a/lib/Core/SpecialFunctionHandler.cpp
+++ b/lib/Core/SpecialFunctionHandler.cpp
@@ -108,7 +108,6 @@ static SpecialFunctionHandler::HandlerInfo handlerInfo[] = {
   add("klee_stack_trace", handleStackTrace, false),
   add("klee_warning", handleWarning, false),
   add("klee_warning_once", handleWarningOnce, false),
-  add("klee_alias_function", handleAliasFunction, false),
   add("malloc", handleMalloc, true),
   add("memalign", handleMemalign, true),
   add("realloc", handleRealloc, true),
@@ -299,20 +298,6 @@ void SpecialFunctionHandler::handleSilentExit(ExecutionState &state,
   executor.terminateState(state);
 }
 
-void SpecialFunctionHandler::handleAliasFunction(ExecutionState &state,
-						 KInstruction *target,
-						 std::vector<ref<Expr> > &arguments) {
-  assert(arguments.size()==2 && 
-         "invalid number of arguments to klee_alias_function");
-  std::string old_fn = readStringAtAddress(state, arguments[0]);
-  std::string new_fn = readStringAtAddress(state, arguments[1]);
-  KLEE_DEBUG_WITH_TYPE("alias_handling", llvm::errs() << "Replacing " << old_fn
-                                           << "() with " << new_fn << "()\n");
-  if (old_fn == new_fn)
-    state.removeFnAlias(old_fn);
-  else state.addFnAlias(old_fn, new_fn);
-}
-
 void SpecialFunctionHandler::handleAssert(ExecutionState &state,
                                           KInstruction *target,
                                           std::vector<ref<Expr> > &arguments) {
diff --git a/lib/Core/SpecialFunctionHandler.h b/lib/Core/SpecialFunctionHandler.h
index fdb6b6de..e041a3e4 100644
--- a/lib/Core/SpecialFunctionHandler.h
+++ b/lib/Core/SpecialFunctionHandler.h
@@ -111,7 +111,6 @@ namespace klee {
     HANDLER(handleDeleteArray);
     HANDLER(handleExit);
     HANDLER(handleErrnoLocation);
-    HANDLER(handleAliasFunction);
     HANDLER(handleFree);
     HANDLER(handleGetErrno);
     HANDLER(handleGetObjSize);