diff options
Diffstat (limited to 'js/public/ScalarType.h')
| -rw-r--r-- | js/public/ScalarType.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/js/public/ScalarType.h b/js/public/ScalarType.h new file mode 100644 index 0000000000..3c98fa204c --- /dev/null +++ b/js/public/ScalarType.h @@ -0,0 +1,232 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* An enumeration of all possible element types in typed data. */ + +#ifndef js_ScalarType_h +#define js_ScalarType_h + +#include "mozilla/Assertions.h" // MOZ_CRASH + +#include <stddef.h> // size_t + +namespace JS { + +namespace Scalar { + +// Scalar types that can appear in typed arrays. +// The enum values must be kept in sync with: +// +// * the TYPEDARRAY_KIND constants +// * the SCTAG_TYPED_ARRAY constants +// * JS_FOR_EACH_TYPED_ARRAY +// * JS_FOR_PROTOTYPES_ +// * JS_FOR_EACH_UNIQUE_SCALAR_TYPE_REPR_CTYPE +// * JIT compilation +// +// and the existing entries here must not be renumbered, since they are +// necessary for backwards compatibility with structured clones from previous +// versions. (It is fine to add new entries and increment +// MaxTypedArrayViewType, or change anything at or after +// MaxTypedArrayViewType.) +enum Type { + Int8 = 0, + Uint8, + Int16, + Uint16, + Int32, + Uint32, + Float32, + Float64, + + /** + * Special type that is a uint8_t, but assignments are clamped to [0, 256). + * Treat the raw data type as a uint8_t. + */ + Uint8Clamped, + + BigInt64, + BigUint64, + + /** + * Types that don't have their own TypedArray equivalent, for now. + * E.g. DataView + */ + MaxTypedArrayViewType, + + Int64, + Simd128, +}; + +static inline size_t byteSize(Type atype) { + switch (atype) { + case Int8: + case Uint8: + case Uint8Clamped: + return 1; + case Int16: + case Uint16: + return 2; + case Int32: + case Uint32: + case Float32: + return 4; + case Int64: + case Float64: + case BigInt64: + case BigUint64: + return 8; + case Simd128: + return 16; + case MaxTypedArrayViewType: + break; + } + MOZ_CRASH("invalid scalar type"); +} + +static inline bool isSignedIntType(Type atype) { + switch (atype) { + case Int8: + case Int16: + case Int32: + case Int64: + case BigInt64: + return true; + case Uint8: + case Uint8Clamped: + case Uint16: + case Uint32: + case Float32: + case Float64: + case BigUint64: + case Simd128: + return false; + case MaxTypedArrayViewType: + break; + } + MOZ_CRASH("invalid scalar type"); +} + +static inline bool isBigIntType(Type atype) { + switch (atype) { + case BigInt64: + case BigUint64: + return true; + case Int8: + case Int16: + case Int32: + case Int64: + case Uint8: + case Uint8Clamped: + case Uint16: + case Uint32: + case Float32: + case Float64: + case Simd128: + return false; + case MaxTypedArrayViewType: + break; + } + MOZ_CRASH("invalid scalar type"); +} + +static inline bool isFloatingType(Type atype) { + switch (atype) { + case Int8: + case Uint8: + case Uint8Clamped: + case Int16: + case Uint16: + case Int32: + case Uint32: + case Int64: + case BigInt64: + case BigUint64: + return false; + case Float32: + case Float64: + case Simd128: + return true; + case MaxTypedArrayViewType: + break; + } + MOZ_CRASH("invalid scalar type"); +} + +static inline const char* name(Type atype) { + switch (atype) { + case Int8: + return "Int8"; + case Uint8: + return "Uint8"; + case Int16: + return "Int16"; + case Uint16: + return "Uint16"; + case Int32: + return "Int32"; + case Uint32: + return "Uint32"; + case Float32: + return "Float32"; + case Float64: + return "Float64"; + case Uint8Clamped: + return "Uint8Clamped"; + case BigInt64: + return "BigInt64"; + case BigUint64: + return "BigUint64"; + case MaxTypedArrayViewType: + return "MaxTypedArrayViewType"; + case Int64: + return "Int64"; + case Simd128: + return "Simd128"; + } + MOZ_CRASH("invalid scalar type"); +} + +static inline const char* byteSizeString(Type atype) { + switch (atype) { + case Int8: + case Uint8: + case Uint8Clamped: + return "1"; + case Int16: + case Uint16: + return "2"; + case Int32: + case Uint32: + case Float32: + return "4"; + case Int64: + case Float64: + case BigInt64: + case BigUint64: + return "8"; + case Simd128: + return "16"; + case MaxTypedArrayViewType: + break; + } + MOZ_CRASH("invalid scalar type"); +} + +} // namespace Scalar + +} // namespace JS + +namespace js { + +// This is aliased in NamespaceImports.h, but that is internal-only and +// inaccessible to Gecko code, which uses this type fairly heavily. Until such +// uses are changed, we need the alias here as well. +namespace Scalar = JS::Scalar; + +} // namespace js + +#endif // js_ScalarType_h |