bc-marker.cpp

/*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-2016 Facebook, Inc. (http://www.facebook.com)     |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
*/

#include "hphp/runtime/vm/jit/bc-marker.h"

#include <folly/Format.h>
#include <folly/Conv.h>

#include "hphp/runtime/base/runtime-option.h"
#include "hphp/runtime/vm/jit/ssa-tmp.h"

namespace HPHP { namespace jit {

//////////////////////////////////////////////////////////////////////

std::string BCMarker::show() const {
  assertx(valid());
  return folly::format(
    "--- bc {}{}, fp {}, spOff {} ({}){}",
    m_sk.offset(),
    m_sk.resumed() ? "r" : "",
    m_fp ? folly::to<std::string>(m_fp->id()) : "_",
    m_spOff.offset,
    m_sk.func()->fullName(),
    m_profTransID != kInvalidTransID
      ? folly::format(" [profTrans={}]", m_profTransID).str()
      : std::string{}
  ).str();
}

bool BCMarker::valid() const {
  if (isDummy()) return true;
  return
    m_sk.valid() &&
    m_sk.offset() >= m_sk.func()->base() &&
    m_sk.offset() < m_sk.func()->past() &&
    // When inlining is on, we may modify markers to weird values in
    // case reentry happens.
    (RuntimeOption::EvalHHIREnableGenTimeInlining ||
     m_spOff.offset <= m_sk.func()->numSlotsInFrame() +
        m_sk.func()->maxStackCells());
}

//////////////////////////////////////////////////////////////////////

}}