[LLVMbugs] [Bug 22457] New: Interpreter ignores LazyFunctionCreator and always perform symbol search

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22457

            Bug ID: 22457
           Summary: Interpreter ignores LazyFunctionCreator and always
                    perform symbol search
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interpreter
          Assignee: unassignedbugs at nondot.org
          Reporter: pguyot at kallisys.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The interpreter ignores the following:
    theInterpreterEngine->DisableSymbolSearching();
    theInterpreterEngine->InstallLazyFunctionCreator(LazyFunctionCreator);

It will always perform symbol-based search for external functions.

The issue probably is in ExternalFunctions.cpp

#ifdef USE_LIBFFI
  std::map<const Function *, RawFunc>::iterator RF = RawFunctions->find(F);
  RawFunc RawFn;
  if (RF == RawFunctions->end()) {
    RawFn = (RawFunc)(intptr_t)
      sys::DynamicLibrary::SearchForAddressOfSymbol(F->getName());
    if (!RawFn)
      RawFn = (RawFunc)(intptr_t)getPointerToGlobalIfAvailable(F);
    if (RawFn != 0)
      RawFunctions->insert(std::make_pair(F, RawFn));  // Cache for later
  } else {
    RawFn = RF->second;
  }

As a result, interpreter cannot call functions with names not supported by the
dynamic linker.

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