| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| package codegen |
| |
| const fragmentBitsTmpl = ` |
| {{- define "BitsForwardDeclaration" }} |
| {{- range .DocComments }} |
| //{{ . }} |
| {{- end }} |
| {{- if .IsStrict }} |
| // |{{ .Name }}| is strict, hence is guaranteed to only contain |
| // members defined in the FIDL schema when receiving it in a message. |
| // Sending unknown members will fail at runtime. |
| {{- else }} |
| // |{{ .Name }}| is flexible, hence may contain unknown members not |
| // defined in the FIDL schema. |
| {{- end }} |
| class {{ .Name }} final { |
| public: |
| constexpr {{ .Name }}() = default; |
| constexpr {{ .Name }}(const {{ .Name }}& other) = default; |
| |
| // Constructs an instance of |{{ .Name }}| from an underlying primitive value, |
| // preserving any bit member not defined in the FIDL schema. |
| explicit constexpr {{ .Name }}({{ .Type }} value) : value_(value) {} |
| |
| {{- range .Members }} |
| const static {{ $.Name }} {{ .Name }}; |
| {{- end }} |
| const static {{ .Name }} kMask; |
| |
| explicit constexpr inline operator {{ .Type }}() const { return value_; } |
| explicit constexpr inline operator bool() const { return static_cast<bool>(value_); } |
| constexpr inline bool operator==(const {{ .Name }}& other) const { return value_ == other.value_; } |
| constexpr inline bool operator!=(const {{ .Name }}& other) const { return value_ != other.value_; } |
| constexpr inline {{ .Name }} operator~() const; |
| constexpr inline {{ .Name }} operator|(const {{ .Name }}& other) const; |
| constexpr inline {{ .Name }} operator&(const {{ .Name }}& other) const; |
| constexpr inline {{ .Name }} operator^(const {{ .Name }}& other) const; |
| constexpr inline void operator|=(const {{ .Name }}& other); |
| constexpr inline void operator&=(const {{ .Name }}& other); |
| constexpr inline void operator^=(const {{ .Name }}& other); |
| |
| // Constructs an instance of |{{ .Name }}| from an underlying primitive value |
| // if the primitive does not contain any unknown members not defined in the |
| // FIDL schema. Otherwise, returns |fit::nullopt|. |
| constexpr inline static fit::optional<{{ .Name }}> TryFrom({{ .Type }} value) { |
| if (value & ~kMask.value_) { |
| return fit::nullopt; |
| } |
| return {{ .Name }}(value & {{ .Name }}::kMask.value_); |
| } |
| |
| // Constructs an instance of |{{ .Name }}| from an underlying primitive value, |
| // clearing any bit member not defined in the FIDL schema. |
| constexpr inline static {{ .Name }} TruncatingUnknown({{ .Type }} value) { |
| return {{ .Name }}(value & {{ .Name }}::kMask.value_); |
| } |
| |
| {{- if .IsFlexible }} |
| constexpr inline {{ .Name }} unknown_bits() const { |
| return *this & {{ .Name }}(~kMask.value_); |
| } |
| constexpr inline bool has_unknown_bits() const { return static_cast<bool>(unknown_bits()); } |
| {{- end }} |
| |
| private: |
| {{ .Type }} value_ = 0; |
| }; |
| |
| {{- range $member := .Members }} |
| constexpr const {{ $.Namespace }}::{{ $.Name }} {{ $.Name }}::{{ $member.Name }} = {{ $.Namespace }}::{{ $.Name }}({{ $member.Value }}); |
| {{- end }} |
| constexpr const {{ .Namespace }}::{{ .Name }} {{ .Name }}::kMask = {{ $.Namespace }}::{{ $.Name }}({{ .Mask }}u); |
| |
| constexpr inline {{ .Namespace }}::{{ .Name }} {{ .Name }}::operator~() const { |
| return {{ $.Namespace }}::{{ $.Name }}(static_cast<{{ .Type }}>(~this->value_ & kMask.value_)); |
| } |
| |
| constexpr inline {{ .Namespace }}::{{ .Name }} {{ .Name }}::operator|( |
| const {{ .Namespace }}::{{ .Name }}& other) const { |
| return {{ $.Namespace }}::{{ $.Name }}(static_cast<{{ .Type }}>(this->value_ | other.value_)); |
| } |
| |
| constexpr inline {{ .Namespace }}::{{ .Name }} {{ .Name }}::operator&( |
| const {{ .Namespace }}::{{ .Name }}& other) const { |
| return {{ $.Namespace }}::{{ $.Name }}(static_cast<{{ .Type }}>(this->value_ & other.value_)); |
| } |
| |
| constexpr inline {{ .Namespace }}::{{ .Name }} {{ .Name }}::operator^( |
| const {{ .Namespace }}::{{ .Name }}& other) const { |
| return {{ $.Namespace }}::{{ $.Name }}(static_cast<{{ .Type }}>(this->value_ ^ other.value_)); |
| } |
| |
| constexpr inline void {{ .Name }}::operator|=( |
| const {{ .Namespace }}::{{ .Name }}& other) { |
| this->value_ |= other.value_; |
| } |
| |
| constexpr inline void {{ .Name }}::operator&=( |
| const {{ .Namespace }}::{{ .Name }}& other) { |
| this->value_ &= other.value_; |
| } |
| |
| constexpr inline void {{ .Name }}::operator^=( |
| const {{ .Namespace }}::{{ .Name }}& other) { |
| this->value_ ^= other.value_; |
| } |
| {{ end }} |
| |
| {{- define "BitsTraits" }} |
| |
| template <> |
| struct IsFidlType<{{ .Namespace }}::{{ .Name }}> : public std::true_type {}; |
| static_assert(std::is_standard_layout_v<{{ .Namespace }}::{{ .Name }}>); |
| static_assert(sizeof({{ .Namespace }}::{{ .Name }}) == sizeof({{ .Type }})); |
| {{- end }} |
| ` |