TypeofEqOperand.h (1422B)
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 vm_TypeofEqOperand_h 8 #define vm_TypeofEqOperand_h 9 10 #include "mozilla/Assertions.h" // MOZ_ASSERT 11 12 #include <stdint.h> // uint8_t 13 14 #include "jspubtd.h" // JSType 15 #include "vm/Opcodes.h" // JSOp 16 17 namespace js { 18 19 struct TypeofEqOperand { 20 static constexpr uint8_t TYPE_MASK = 0x0f; 21 static constexpr uint8_t NEQ_BIT = 0x80; 22 23 private: 24 uint8_t value; 25 26 static uint8_t toNeqBit(JSOp compareOp) { 27 MOZ_ASSERT(compareOp == JSOp::Eq || compareOp == JSOp::Ne); 28 return compareOp == JSOp::Ne ? NEQ_BIT : 0; 29 } 30 31 explicit TypeofEqOperand(uint8_t value) : value(value) {} 32 33 public: 34 TypeofEqOperand(JSType type, JSOp compareOp) 35 : value(type | toNeqBit(compareOp)) {} 36 37 static TypeofEqOperand fromRawValue(uint8_t value) { 38 return TypeofEqOperand(value); 39 } 40 41 JSType type() const { return JSType(value & TYPE_MASK); } 42 JSOp compareOp() const { return (value & NEQ_BIT) ? JSOp::Ne : JSOp::Eq; } 43 uint8_t rawValue() const { return value; } 44 }; 45 46 static_assert((JSTYPE_LIMIT & TypeofEqOperand::TYPE_MASK) == JSTYPE_LIMIT); 47 48 } // namespace js 49 50 #endif // vm_TypeofEqOperand_h