/*

 * 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 "compiler/disassembler.hpp"

#include "oops/oop.inline.hpp"

#include "prims/forte.hpp"

#include "runtime/stubCodeGenerator.hpp"

// Implementation of StubCodeDesc

StubCodeDesc* StubCodeDesc::_list = NULL;

bool          StubCodeDesc::_frozen = false;

StubCodeDesc* StubCodeDesc::desc_for(address pc) {

  StubCodeDesc* p = _list;

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

    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::freeze() {

  assert(!_frozen, "repeated freeze operation");

  _frozen = true;

}

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 );

  _print_code = PrintStubCode || print_code;

}

StubCodeGenerator::~StubCodeGenerator() {

  if (PRODUCT_ONLY(_print_code) NOT_PRODUCT(true)) {

    CodeBuffer* cbuf = _masm->code();

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

    if (blob != NULL) {

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

    }

  }

}

void StubCodeGenerator::stub_prolog(StubCodeDesc* cdesc) {

  // default implementation - do nothing

}

void StubCodeGenerator::stub_epilog(StubCodeDesc* cdesc) {

  if (_print_code) {

    CodeStrings cs;

    ptrdiff_t offset = 0;

#ifndef PRODUCT

    // Find the code strings in the outer CodeBuffer.

    CodeBuffer *outer_cbuf = _masm->code_section()->outer();

    cs = outer_cbuf->strings();

    // The offset from the start of the outer CodeBuffer to the start

    // of this stub.

    offset = cdesc->begin() - outer_cbuf->insts()->start();

#endif

    cdesc->print();

    tty->cr();

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

    tty->cr();

  }

}

// 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());

  }

}