llvm/InitializeLLVMPOSIX.cpp

   1 /*
   2  * Copyright (C) 2013-2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "InitializeLLVMPOSIX.h"
  28
  29 #if HAVE(LLVM)
  30
  31 #include "LLVMAPI.h"
  32 #include "Options.h"
  33 #include <dlfcn.h>
  34 #include <wtf/DataLog.h>
  35
  36 namespace JSC {
  37
  38 LLVMInitializerFunction getLLVMInitializerFunctionPOSIX(const char* libraryName, bool verbose)
  39 {
  40     int flags = RTLD_NOW;
  41
  42 #if OS(LINUX)
  43     // We need this to cause our overrides (like __cxa_atexit) to take precedent over the __cxa_atexit that is already
  44     // globally exported. Those overrides are necessary to prevent crashes (our __cxa_atexit turns off LLVM's exit-time
  45     // destruction, which causes exit-time crashes if the concurrent JIT is still running) and to make LLVM assertion
  46     // failures funnel through WebKit's mechanisms. This flag induces behavior that is the default on Darwin. Other OSes
  47     // may need their own flags in place of this.
  48     flags |= RTLD_DEEPBIND;
  49 #endif
  50
  51     void* library = dlopen(libraryName, flags);
  52     if (!library) {
  53         if (verbose)
  54             dataLog("Failed to load LLVM library at ", libraryName, ": ", dlerror(), "\n");
  55         return nullptr;
  56     }
  57
  58     const char* symbolName = "initializeAndGetJSCLLVMAPI";
  59     LLVMInitializerFunction initializer = bitwise_cast<LLVMInitializerFunction>(
  60         dlsym(library, symbolName));
  61     if (!initializer) {
  62         if (verbose)
  63             dataLog("Failed to find ", symbolName, " in ", libraryName, ": ", dlerror());
  64         return nullptr;
  65     }
  66
  67     return initializer;
  68 }
  69
  70 } // namespace JSC
  71
  72 #endif // HAVE(LLVM)
  73