/*

 * Copyright (c) 1997, 2015, 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 "asm/macroAssembler.hpp"

#include "asm/macroAssembler.inline.hpp"

#include "code/codeCache.hpp"

#include "code/codeCacheExtensions.hpp"

#include "compiler/disassembler.hpp"

#include "oops/oop.inline.hpp"

#include "prims/forte.hpp"

#include "runtime/stubCodeGenerator.hpp"

// Implementation of StubCodeDesc

StubCodeDesc* StubCodeDesc::_list = NULL;

int           StubCodeDesc::_count = 0;

StubCodeDesc* StubCodeDesc::desc_for(address pc) {

  StubCodeDesc* p = _list;

  while (p != NULL && !p->contains(pc)) p = p->_next;

  // p == NULL || p->contains(pc)

  return p;

}

StubCodeDesc* StubCodeDesc::desc_for_index(int index) {

  StubCodeDesc* p = _list;

  while (p != NULL && p->index() != index) p = p->_next;

  return p;

}

const char* StubCodeDesc::name_for(address pc) {

  StubCodeDesc* p = desc_for(pc);

  return p == NULL ? NULL : p->name();

}

void StubCodeDesc::print_on(outputStream* st) const {

  st->print("%s", group());

  st->print("::");

  st->print("%s", name());

  st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT "[ (%d bytes)", p2i(begin()), p2i(end()), size_in_bytes());

}

// Implementation of StubCodeGenerator

StubCodeGenerator::StubCodeGenerator(CodeBuffer* code, bool print_code) {

  _masm = new MacroAssembler(code);

  _first_stub = _last_stub = NULL;

  _print_code = print_code;

}

extern "C" {

  static int compare_cdesc(const void* void_a, const void* void_b) {

    int ai = (*((StubCodeDesc**) void_a))->index();

    int bi = (*((StubCodeDesc**) void_b))->index();

    return ai - bi;

  }

}

StubCodeGenerator::~StubCodeGenerator() {

  if (PrintStubCode || _print_code) {

    CodeBuffer* cbuf = _masm->code();

    CodeBlob*   blob = CodeCache::find_blob_unsafe(cbuf->insts()->start());

    if (blob != NULL) {

      blob->set_strings(cbuf->strings());

    }

    bool saw_first = false;

    StubCodeDesc* toprint[1000];

    int toprint_len = 0;

    for (StubCodeDesc* cdesc = _last_stub; cdesc != NULL; cdesc = cdesc->_next) {

      toprint[toprint_len++] = cdesc;

      if (cdesc == _first_stub) { saw_first = true; break; }

    }

    assert(toprint_len == 0 || saw_first, "must get both first & last");

    // Print in reverse order:

    qsort(toprint, toprint_len, sizeof(toprint[0]), compare_cdesc);

    for (int i = 0; i < toprint_len; i++) {

      StubCodeDesc* cdesc = toprint[i];

      cdesc->print();

      tty->cr();

      Disassembler::decode(cdesc->begin(), cdesc->end());

      tty->cr();

    }

  }

}

void StubCodeGenerator::stub_prolog(StubCodeDesc* cdesc) {

  // default implementation - do nothing

}

void StubCodeGenerator::stub_epilog(StubCodeDesc* cdesc) {

  // default implementation - record the cdesc

  if (_first_stub == NULL)  _first_stub = cdesc;

  _last_stub = cdesc;

}

// Implementation of CodeMark

StubCodeMark::StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name) {

  _cgen  = cgen;

  _cdesc = new StubCodeDesc(group, name, _cgen->assembler()->pc());

  _cgen->stub_prolog(_cdesc);

  // define the stub's beginning (= entry point) to be after the prolog:

  _cdesc->set_begin(_cgen->assembler()->pc());

}

StubCodeMark::~StubCodeMark() {

  _cgen->assembler()->flush();

  _cdesc->set_end(_cgen->assembler()->pc());

  assert(StubCodeDesc::_list == _cdesc, "expected order on list");

  _cgen->stub_epilog(_cdesc);

  Forte::register_stub(_cdesc->name(), _cdesc->begin(), _cdesc->end());

  if (JvmtiExport::should_post_dynamic_code_generated()) {

    JvmtiExport::post_dynamic_code_generated(_cdesc->name(), _cdesc->begin(), _cdesc->end());

  }

}