js/src/jit/ABIFunctionType.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef jit_ABIFunctionType_h
   8 #define jit_ABIFunctionType_h
   9
  10 #include <initializer_list>
  11 #include <stdint.h>
  12
  13 #include "jit/ABIFunctionTypeGenerated.h"
  14
  15 namespace js {
  16 namespace jit {
  17
  18 enum class ABIType {
  19   // A pointer sized integer
  20   General = 0x1,
  21   // A 32-bit integer
  22   Int32 = 0x2,
  23   // A 64-bit integer
  24   Int64 = 0x3,
  25   // A 32-bit floating point number
  26   Float32 = 0x4,
  27   // A 64-bit floating point number
  28   Float64 = 0x5
  29 };
  30
  31 const size_t ABITypeArgShift = 0x3;
  32 const size_t ABITypeArgMask = (1 << ABITypeArgShift) - 1;
  33
  34 namespace detail {
  35
  36 static constexpr uint64_t MakeABIFunctionType(
  37     ABIType ret, std::initializer_list<ABIType> args) {
  38   uint64_t abiType = 0;
  39   for (auto arg : args) {
  40     abiType <<= ABITypeArgShift;
  41     abiType |= (uint64_t)arg;
  42   }
  43   abiType <<= ABITypeArgShift;
  44   abiType |= (uint64_t)ret;
  45   return abiType;
  46 }
  47
  48 }  // namespace detail
  49
  50 enum ABIFunctionType : uint64_t {
  51   // The enum must be explicitly typed to avoid UB: some validly constructed
  52   // members are larger than any explicitly declared members.
  53   ABI_FUNCTION_TYPE_ENUM
  54 };
  55
  56 static constexpr ABIFunctionType MakeABIFunctionType(
  57     ABIType ret, std::initializer_list<ABIType> args) {
  58   return ABIFunctionType(detail::MakeABIFunctionType(ret, args));
  59 }
  60
  61 }  // namespace jit
  62 }  // namespace js
  63
  64 #endif /* jit_ABIFunctionType_h */