hhvm/hphp/runtime/vm/jit/arg-group.cpp at master · MaxSem/hhvm · GitHub

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/*
   +----------------------------------------------------------------------+
   | 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/arg-group.h"

#include "hphp/runtime/vm/jit/abi.h"
#include "hphp/runtime/vm/jit/code-gen-helpers.h"

namespace HPHP { namespace jit {

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

TRACE_SET_MOD(hhir);

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

const char* destTypeName(DestType dt) {
  switch (dt) {
    case DestType::None: return "None";
    case DestType::SSA:  return "SSA";
    case DestType::Byte: return "Byte";
    case DestType::TV:   return "TV";
    case DestType::Dbl:  return "Dbl";
    case DestType::SIMD: return "SIMD";
  }
  not_reached();
}

ArgDesc::ArgDesc(SSATmp* tmp, Vloc loc, bool val) {
  if (tmp->hasConstVal()) {
    // tmp is a constant
    if (val) {
      m_imm64 = tmp->rawVal();
      m_kind = Kind::Imm;
    } else {
      static_assert(offsetof(TypedValue, m_type) % 8 == 0, "");
      m_typeImm = tmp->type().toDataType();
      m_kind = Kind::TypeImm;
    }
    return;
  }

  if (val) {
    assertx(loc.reg(0) != InvalidReg);
    m_srcReg = loc.reg(0);
    m_kind = Kind::Reg;
    // zero extend any boolean value that we pass to the helper in case
    // the helper expects it (e.g., as TypedValue)
    if (tmp->isA(TBool)) m_zeroExtend = true;
    return;
  }

  if (tmp->numWords() > 1) {
    assertx(loc.reg(1) != InvalidReg);
    // val is false so we're passing tmp's type.
    m_srcReg = loc.reg(1);
    m_kind = Kind::Reg;
    return;
  }

  // arg is the (constant) type of a known-typed value.
  static_assert(offsetof(TypedValue, m_type) % 8 == 0, "");
  m_typeImm = tmp->type().toDataType();
  m_kind = Kind::TypeImm;
}

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

ArgGroup& ArgGroup::typedValue(int i) {
  // If there's exactly one register argument slot left, the whole TypedValue
  // goes on the stack instead of being split between a register and the
  // stack.
  if (m_gpArgs.size() == num_arg_regs() - 1) {
    m_override = &m_stkArgs;
  }
  static_assert(offsetof(TypedValue, m_data) == 0, "");
  static_assert(offsetof(TypedValue, m_type) == 8, "");
  ssa(i).type(i);
  m_override = nullptr;
  return *this;
}

void ArgGroup::push_arg(const ArgDesc& arg) {
  // If m_override is set, use it unconditionally. Otherwise, select
  // m_gpArgs or m_stkArgs depending on how many args we've already pushed.
  ArgVec* args = m_override;
  if (!args) {
    args = m_gpArgs.size() < num_arg_regs() ? &m_gpArgs : &m_stkArgs;
  }
  args->push_back(arg);
}

void ArgGroup::push_SIMDarg(const ArgDesc& arg) {
  // See push_arg above
  ArgVec* args = m_override;
  if (!args) {
    args = m_simdArgs.size() < num_arg_regs_simd()
         ? &m_simdArgs : &m_stkArgs;
  }
  args->push_back(arg);
}

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

}}