/*

 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "precompiled.hpp"

#include "aot/aotCodeHeap.hpp"

#include "aot/aotLoader.inline.hpp"

#include "jvmci/jvmciRuntime.hpp"

#include "oops/method.hpp"

#include "runtime/os.hpp"

GrowableArray<AOTCodeHeap*>* AOTLoader::_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<AOTCodeHeap*> (2, true);

GrowableArray<AOTLib*>* AOTLoader::_libraries = new(ResourceObj::C_HEAP, mtCode) GrowableArray<AOTLib*> (2, true);

// Iterate over all AOT CodeHeaps

#define FOR_ALL_AOT_HEAPS(heap) for (GrowableArrayIterator<AOTCodeHeap*> heap = heaps()->begin(); heap != heaps()->end(); ++heap)

// Iterate over all AOT Libraries

#define FOR_ALL_AOT_LIBRARIES(lib) for (GrowableArrayIterator<AOTLib*> lib = libraries()->begin(); lib != libraries()->end(); ++lib)

void AOTLoader::load_for_klass(instanceKlassHandle kh, Thread* thread) {

  if (UseAOT) {

    FOR_ALL_AOT_HEAPS(heap) {

      (*heap)->load_klass_data(kh, thread);

    }

  }

}

uint64_t AOTLoader::get_saved_fingerprint(InstanceKlass* ik) {

  FOR_ALL_AOT_HEAPS(heap) {

    AOTKlassData* klass_data = (*heap)->find_klass(ik);

    if (klass_data != NULL) {

      return klass_data->_fingerprint;

    }

  }

  return 0;

}

bool AOTLoader::find_klass(InstanceKlass* ik) {

  FOR_ALL_AOT_HEAPS(heap) {

    if ((*heap)->find_klass(ik) != NULL) {

      return true;

    }

  }

  return false;

}

bool AOTLoader::contains(address p) {

  FOR_ALL_AOT_HEAPS(heap) {

    if ((*heap)->contains(p)) {

      return true;

    }

  }

  return false;

}

void AOTLoader::oops_do(OopClosure* f) {

  if (UseAOT) {

    FOR_ALL_AOT_HEAPS(heap) {

      (*heap)->oops_do(f);

    }

  }

}

void AOTLoader::metadata_do(void f(Metadata*)) {

  if (UseAOT) {

    FOR_ALL_AOT_HEAPS(heap) {

      (*heap)->metadata_do(f);

    }

  }

}

address AOTLoader::exception_begin(JavaThread* thread, CodeBlob* blob, address return_address) {

  assert(blob->is_aot(), "sanity");

  AOTCompiledMethod* aotm = (AOTCompiledMethod*)blob;

  // Set flag if return address is a method handle call site.

  thread->set_is_method_handle_return(aotm->is_method_handle_return(return_address));

  return aotm->exception_begin();

}

// Flushing and deoptimization in case of evolution

void AOTLoader::flush_evol_dependents_on(instanceKlassHandle dependee) {

  // make non entrant and mark for deoptimization

  FOR_ALL_AOT_HEAPS(heap) {

    (*heap)->flush_evol_dependents_on(dependee);

  }

  Deoptimization::deoptimize_dependents();

}

/**

 * List of core modules for which we search for shared libraries.

 */

static const char* modules[] = {

  "java.base",

  "java.logging",

  "jdk.compiler",

  "jdk.scripting.nashorn",

  "jdk.internal.vm.ci",

  "jdk.internal.vm.compiler"

};

void AOTLoader::initialize() {

  if (FLAG_IS_DEFAULT(UseAOT) && AOTLibrary != NULL) {

    // Don't need to set UseAOT on command line when AOTLibrary is specified

    FLAG_SET_DEFAULT(UseAOT, true);

  }

  if (UseAOT) {

    // EagerInitialization is not compatible with AOT

    if (EagerInitialization) {

      if (PrintAOT) {

        warning("EagerInitialization is not compatible with AOT (switching AOT off)");

      }

      FLAG_SET_DEFAULT(UseAOT, false);

      return;

    }

    // -Xint is not compatible with AOT

    if (Arguments::is_interpreter_only()) {

      if (PrintAOT) {

        warning("-Xint is not compatible with AOT (switching AOT off)");

      }

      FLAG_SET_DEFAULT(UseAOT, false);

      return;

    }

    const char* home = Arguments::get_java_home();

    const char* file_separator = os::file_separator();

    for (int i = 0; i < (int) (sizeof(modules) / sizeof(const char*)); i++) {

      char library[JVM_MAXPATHLEN];

      jio_snprintf(library, sizeof(library), "%s%slib%slib%s%s%s%s", home, file_separator, file_separator, modules[i], UseCompressedOops ? "-coop" : "", UseG1GC ? "" : "-nong1", os::dll_file_extension());

      load_library(library, false);

    }

    // Scan the AOTLibrary option.

    if (AOTLibrary != NULL) {

      const int len = (int)strlen(AOTLibrary);

      char* cp  = NEW_C_HEAP_ARRAY(char, len+1, mtCode);

      if (cp != NULL) { // No memory?

        memcpy(cp, AOTLibrary, len);

        cp[len] = '\0';

        char* end = cp + len;

        while (cp < end) {

          const char* name = cp;

          while ((*cp) != '\0' && (*cp) != '\n' && (*cp) != ',' && (*cp) != ':' && (*cp) != ';')  cp++;

          cp[0] = '\0';  // Terminate name

          cp++;

          load_library(name, true);

        }

      }

    }

  }

}

void AOTLoader::universe_init() {

  if (UseAOT && libraries_count() > 0) {

    // Shifts are static values which initialized by 0 until java heap initialization.

    // AOT libs are loaded before heap initialized so shift values are not set.

    // It is okay since ObjectAlignmentInBytes flag which defines shifts value is set before AOT libs are loaded.

    // Set shifts value based on first AOT library config.

    if (UseCompressedOops && AOTLib::narrow_oop_shift_initialized()) {

      int oop_shift = Universe::narrow_oop_shift();

      if (oop_shift == 0) {

        Universe::set_narrow_oop_shift(AOTLib::narrow_oop_shift());

      } else {

        FOR_ALL_AOT_LIBRARIES(lib) {

          (*lib)->verify_flag(AOTLib::narrow_oop_shift(), oop_shift, "Universe::narrow_oop_shift");

        }

      }

      if (UseCompressedClassPointers) { // It is set only if UseCompressedOops is set

        int klass_shift = Universe::narrow_klass_shift();

        if (klass_shift == 0) {

          Universe::set_narrow_klass_shift(AOTLib::narrow_klass_shift());

        } else {

          FOR_ALL_AOT_LIBRARIES(lib) {

            (*lib)->verify_flag(AOTLib::narrow_klass_shift(), klass_shift, "Universe::narrow_klass_shift");

          }

        }

      }

    }

    // Create heaps for all the libraries

    FOR_ALL_AOT_LIBRARIES(lib) {

      if ((*lib)->is_valid()) {

        AOTCodeHeap* heap = new AOTCodeHeap(*lib);

        {

          MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

          add_heap(heap);

          CodeCache::add_heap(heap);

        }

      }

    }

  }

  if (heaps_count() == 0) {

    if (FLAG_IS_DEFAULT(UseAOT)) {

      FLAG_SET_DEFAULT(UseAOT, false);

    }

  }

}

void AOTLoader::set_narrow_klass_shift() {

  // This method could be called from Metaspace::set_narrow_klass_base_and_shift().

  // In case it is not called (during dump CDS, for example) the corresponding code in

  // AOTLoader::universe_init(), which is called later, will set the shift value.

  if (UseAOT && libraries_count() > 0 &&

      UseCompressedOops && AOTLib::narrow_oop_shift_initialized() &&

      UseCompressedClassPointers) {

    int klass_shift = Universe::narrow_klass_shift();

    if (klass_shift == 0) {

      Universe::set_narrow_klass_shift(AOTLib::narrow_klass_shift());

    } else {

      FOR_ALL_AOT_LIBRARIES(lib) {

        (*lib)->verify_flag(AOTLib::narrow_klass_shift(), klass_shift, "Universe::narrow_klass_shift");

      }

    }

  }

}

void AOTLoader::load_library(const char* name, bool exit_on_error) {

  char ebuf[1024];

  void* handle = os::dll_load(name, ebuf, sizeof ebuf);

  if (handle == NULL) {

    if (exit_on_error) {

      tty->print_cr("error opening file: %s", ebuf);

      vm_exit(1);

    }

    return;

  }

  const int dso_id = libraries_count() + 1;

  AOTLib* lib = new AOTLib(handle, name, dso_id);

  if (!lib->is_valid()) {

    delete lib;

    os::dll_unload(handle);

    return;

  }

  add_library(lib);

}

#ifndef PRODUCT

void AOTLoader::print_statistics() {

  { ttyLocker ttyl;

    tty->print_cr("--- AOT Statistics ---");

    tty->print_cr("AOT libraries loaded: %d", heaps_count());

    AOTCodeHeap::print_statistics();

  }

}

#endif