/*

 * Copyright (c) 2012, 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 "memory/universe.hpp"

#include "oops/oop.inline.hpp"

#include "classfile/symbolTable.hpp"

#include "classfile/classLoaderData.hpp"

#include "prims/whitebox.hpp"

#include "prims/wbtestmethods/parserTests.hpp"

#include "runtime/interfaceSupport.hpp"

#include "runtime/os.hpp"

#include "utilities/debug.hpp"

#include "utilities/macros.hpp"

#if INCLUDE_ALL_GCS

#include "gc_implementation/g1/concurrentMark.hpp"

#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

#include "gc_implementation/g1/heapRegionRemSet.hpp"

#endif // INCLUDE_ALL_GCS

#ifdef INCLUDE_NMT

#include "services/memTracker.hpp"

#endif // INCLUDE_NMT

bool WhiteBox::_used = false;

WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))

  return (jlong)(void*)JNIHandles::resolve(obj);

WB_END

WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))

  return heapOopSize;

WB_END

class WBIsKlassAliveClosure : public KlassClosure {

    Symbol* _name;

    bool _found;

public:

    WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}

    void do_klass(Klass* k) {

      if (_found) return;

      Symbol* ksym = k->name();

      if (ksym->fast_compare(_name) == 0) {

        _found = true;

      }

    }

    bool found() const {

        return _found;

    }

};

WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))

  Handle h_name = JNIHandles::resolve(name);

  if (h_name.is_null()) return false;

  Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);

  TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return

  WBIsKlassAliveClosure closure(sym);

  ClassLoaderDataGraph::classes_do(&closure);

  return closure.found();

WB_END

#if INCLUDE_ALL_GCS

WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))

  G1CollectedHeap* g1 = G1CollectedHeap::heap();

  oop result = JNIHandles::resolve(obj);

  const HeapRegion* hr = g1->heap_region_containing(result);

  return hr->isHumongous();

WB_END

WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))

  G1CollectedHeap* g1 = G1CollectedHeap::heap();

  size_t nr = g1->free_regions();

  return (jlong)nr;

WB_END

WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))

  G1CollectedHeap* g1 = G1CollectedHeap::heap();

  ConcurrentMark* cm = g1->concurrent_mark();

  return cm->concurrent_marking_in_progress();

WB_END

WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))

  return (jint)HeapRegion::GrainBytes;

WB_END

#endif // INCLUDE_ALL_GCS

#ifdef INCLUDE_NMT

// Keep track of the 3 allocations in NMTAllocTest so we can free them later

// on and verify that they're not visible anymore

static void* nmtMtTest1 = NULL, *nmtMtTest2 = NULL, *nmtMtTest3 = NULL;

// Alloc memory using the test memory type so that we can use that to see if

// NMT picks it up correctly

WB_ENTRY(jboolean, WB_NMTAllocTest(JNIEnv* env))

  void *mem;

  if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {

    return false;

  }

  // Allocate 2 * 128k + 256k + 1024k and free the 1024k one to make sure we track

  // everything correctly. Total should be 512k held alive.

  nmtMtTest1 = os::malloc(128 * 1024, mtTest);

  mem = os::malloc(1024 * 1024, mtTest);

  nmtMtTest2 = os::malloc(256 * 1024, mtTest);

  os::free(mem, mtTest);

  nmtMtTest3 = os::malloc(128 * 1024, mtTest);

  return true;

WB_END

// Free the memory allocated by NMTAllocTest

WB_ENTRY(jboolean, WB_NMTFreeTestMemory(JNIEnv* env))

  if (nmtMtTest1 == NULL || nmtMtTest2 == NULL || nmtMtTest3 == NULL) {

    return false;

  }

  os::free(nmtMtTest1, mtTest);

  nmtMtTest1 = NULL;

  os::free(nmtMtTest2, mtTest);

  nmtMtTest2 = NULL;

  os::free(nmtMtTest3, mtTest);

  nmtMtTest3 = NULL;

  return true;

WB_END

// Block until the current generation of NMT data to be merged, used to reliably test the NMT feature

WB_ENTRY(jboolean, WB_NMTWaitForDataMerge(JNIEnv* env))

  if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {

    return false;

  }

  return MemTracker::wbtest_wait_for_data_merge();

WB_END

#endif // INCLUDE_NMT

//Some convenience methods to deal with objects from java

int WhiteBox::offset_for_field(const char* field_name, oop object,

    Symbol* signature_symbol) {

  assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");

  Thread* THREAD = Thread::current();

  //Get the class of our object

  Klass* arg_klass = object->klass();

  //Turn it into an instance-klass

  InstanceKlass* ik = InstanceKlass::cast(arg_klass);

  //Create symbols to look for in the class

  TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),

      THREAD);

  //To be filled in with an offset of the field we're looking for

  fieldDescriptor fd;

  Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);

  if (res == NULL) {

    tty->print_cr("Invalid layout of %s at %s", ik->external_name(),

        name_symbol->as_C_string());

    fatal("Invalid layout of preloaded class");

  }

  //fetch the field at the offset we've found

  int dest_offset = fd.offset();

  return dest_offset;

}

const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {

  int offset = offset_for_field(field_name, object,

      vmSymbols::string_signature());

  oop string = object->obj_field(offset);

  if (string == NULL) {

    return NULL;

  }

  const char* ret = java_lang_String::as_utf8_string(string);

  return ret;

}

bool WhiteBox::lookup_bool(const char* field_name, oop object) {

  int offset =

      offset_for_field(field_name, object, vmSymbols::bool_signature());

  bool ret = (object->bool_field(offset) == JNI_TRUE);

  return ret;

}

#define CC (char*)

static JNINativeMethod methods[] = {

  {CC"getObjectAddress",   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },

  {CC"getHeapOopSize",     CC"()I",                   (void*)&WB_GetHeapOopSize    },

  {CC"isClassAlive0",       CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },

  {CC "parseCommandLine",

      CC "(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",

      (void*) &WB_ParseCommandLine

  },

#if INCLUDE_ALL_GCS

  {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},

  {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },

  {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },

  {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },

#endif // INCLUDE_ALL_GCS

#ifdef INCLUDE_NMT

  {CC"NMTAllocTest",       CC"()Z",                   (void*)&WB_NMTAllocTest      },

  {CC"NMTFreeTestMemory",  CC"()Z",                   (void*)&WB_NMTFreeTestMemory },

  {CC"NMTWaitForDataMerge",CC"()Z",                   (void*)&WB_NMTWaitForDataMerge},

#endif // INCLUDE_NMT

};

#undef CC

JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))

  {

    if (WhiteBoxAPI) {

      // Make sure that wbclass is loaded by the null classloader

      instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());

      Handle loader(ikh->class_loader());

      if (loader.is_null()) {

        ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI

        jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));

        if (result == 0) {

          WhiteBox::set_used();

        }

      }

    }

  }

JVM_END