зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
2.6 KiB
C++
134 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* An enumeration of all possible element types in typed data. */
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#ifndef js_ScalarType_h
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#define js_ScalarType_h
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#include "mozilla/Assertions.h" // MOZ_CRASH
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#include <stddef.h> // size_t
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namespace js {
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namespace Scalar {
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// Scalar types that can appear in typed arrays and typed objects.
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// The enum values must be kept in sync with:
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// * the JS_SCALARTYPEREPR constants
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// * the TYPEDARRAY_KIND constants
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// * the SCTAG_TYPED_ARRAY constants
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// * JS_FOR_EACH_TYPEDARRAY
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// * JS_FOR_PROTOTYPES_
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// * JS_FOR_EACH_UNIQUE_SCALAR_TYPE_REPR_CTYPE
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// * JIT compilation
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enum Type {
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Int8 = 0,
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Uint8,
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Int16,
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Uint16,
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Int32,
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Uint32,
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Float32,
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Float64,
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/**
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* Special type that is a uint8_t, but assignments are clamped to [0, 256).
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* Treat the raw data type as a uint8_t.
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*/
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Uint8Clamped,
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BigInt64,
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BigUint64,
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/**
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* Types that don't have their own TypedArray equivalent, for now.
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*/
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MaxTypedArrayViewType,
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Int64,
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Simd128,
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};
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static inline size_t byteSize(Type atype) {
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switch (atype) {
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case Int8:
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case Uint8:
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case Uint8Clamped:
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return 1;
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case Int16:
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case Uint16:
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return 2;
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case Int32:
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case Uint32:
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case Float32:
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return 4;
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case Int64:
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case Float64:
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case BigInt64:
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case BigUint64:
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return 8;
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case Simd128:
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return 16;
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case MaxTypedArrayViewType:
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break;
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}
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MOZ_CRASH("invalid scalar type");
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}
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static inline bool isSignedIntType(Type atype) {
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switch (atype) {
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case Int8:
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case Int16:
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case Int32:
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case Int64:
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case BigInt64:
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return true;
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case Uint8:
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case Uint8Clamped:
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case Uint16:
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case Uint32:
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case Float32:
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case Float64:
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case BigUint64:
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case Simd128:
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return false;
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case MaxTypedArrayViewType:
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break;
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}
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MOZ_CRASH("invalid scalar type");
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}
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static inline bool isBigIntType(Type atype) {
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switch (atype) {
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case BigInt64:
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case BigUint64:
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return true;
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case Int8:
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case Int16:
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case Int32:
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case Int64:
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case Uint8:
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case Uint8Clamped:
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case Uint16:
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case Uint32:
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case Float32:
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case Float64:
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case Simd128:
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return false;
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case MaxTypedArrayViewType:
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break;
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}
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MOZ_CRASH("invalid scalar type");
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}
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} // namespace Scalar
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} // namespace js
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#endif // js_ScalarType_h
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