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use super::*;
impl<'c> Lowerer<'c> {
pub(super) fn expand_decode(&self, codec: &CodecPlan) -> ReadSeq {
self.expand_decode_with_offset(codec, "pos")
}
// self is only used in recursive calls, records, enums, vecs all recurse back here,
// but clippy does not see through the recursion and thinks it is unused.
#[allow(clippy::only_used_in_recursion)]
pub(super) fn expand_decode_with_offset(&self, codec: &CodecPlan, base: &str) -> ReadSeq {
let offset = OffsetExpr::Base;
match codec {
CodecPlan::Void => ReadSeq {
size: SizeExpr::Fixed(0),
ops: vec![],
shape: WireShape::Value,
},
CodecPlan::Primitive(primitive) => ReadSeq {
size: SizeExpr::Fixed(primitive.wire_size_bytes()),
ops: vec![ReadOp::Primitive {
primitive: *primitive,
offset,
}],
shape: WireShape::Value,
},
CodecPlan::String => ReadSeq {
size: SizeExpr::Runtime,
ops: vec![ReadOp::String { offset }],
shape: WireShape::Value,
},
CodecPlan::Bytes => ReadSeq {
size: SizeExpr::Runtime,
ops: vec![ReadOp::Bytes { offset }],
shape: WireShape::Value,
},
CodecPlan::Builtin(id) => {
let size = self
.builtin_fixed_size(id)
.map(SizeExpr::Fixed)
.unwrap_or(SizeExpr::Runtime);
ReadSeq {
size,
ops: vec![ReadOp::Builtin {
id: id.clone(),
offset,
}],
shape: WireShape::Value,
}
}
CodecPlan::Option(inner) => ReadSeq {
size: SizeExpr::Runtime,
ops: vec![ReadOp::Option {
tag_offset: offset,
some: Box::new(self.expand_decode_with_offset(inner, "pos")),
}],
shape: WireShape::Optional,
},
CodecPlan::Vec { element, layout } => ReadSeq {
size: SizeExpr::Runtime,
ops: vec![ReadOp::Vec {
len_offset: offset,
element_type: TypeExpr::from(element.as_ref()),
element: Box::new(self.expand_decode_with_offset(element, "pos")),
layout: layout.clone(),
}],
shape: WireShape::Sequence,
},
CodecPlan::Result { ok, err } => ReadSeq {
size: SizeExpr::Runtime,
ops: vec![ReadOp::Result {
tag_offset: offset,
ok: Box::new(self.expand_decode_with_offset(ok, "pos")),
err: Box::new(self.expand_decode_with_offset(err, "pos")),
}],
shape: WireShape::Value,
},
CodecPlan::Record { id, layout } => {
let (fields, size) = match layout {
RecordLayout::Blittable { fields, size } => (
fields
.iter()
.map(|field| {
let offset_expr = if field.offset == 0 {
OffsetExpr::Base
} else {
OffsetExpr::BasePlus(field.offset)
};
FieldReadOp {
name: field.name.clone(),
seq: ReadSeq {
size: SizeExpr::Fixed(field.primitive.wire_size_bytes()),
ops: vec![ReadOp::Primitive {
primitive: field.primitive,
offset: offset_expr,
}],
shape: WireShape::Value,
},
}
})
.collect(),
SizeExpr::Fixed(*size),
),
RecordLayout::Encoded { fields } => (
fields
.iter()
.map(|field| FieldReadOp {
name: field.name.clone(),
seq: self.expand_decode_with_offset(&field.codec, "pos"),
})
.collect(),
SizeExpr::Runtime,
),
RecordLayout::Recursive => (vec![], SizeExpr::Runtime),
};
ReadSeq {
size,
ops: vec![ReadOp::Record {
id: id.clone(),
offset,
fields,
}],
shape: WireShape::Value,
}
}
CodecPlan::Enum { id, layout } => ReadSeq {
size: match layout {
EnumLayout::CStyle { .. } => SizeExpr::Fixed(4),
EnumLayout::Data { .. } | EnumLayout::Recursive => SizeExpr::Runtime,
},
ops: vec![ReadOp::Enum {
id: id.clone(),
offset,
layout: layout.clone(),
}],
shape: WireShape::Value,
},
CodecPlan::Custom { id, underlying } => {
let underlying_seq = self.expand_decode_with_offset(underlying, base);
ReadSeq {
size: underlying_seq.size.clone(),
ops: vec![ReadOp::Custom {
id: id.clone(),
underlying: Box::new(underlying_seq),
}],
shape: WireShape::Value,
}
}
}
}
pub(super) fn expand_encode(&self, codec: &CodecPlan, value: ValueExpr) -> WriteSeq {
match codec {
CodecPlan::Void => WriteSeq {
size: SizeExpr::Fixed(0),
ops: vec![],
shape: WireShape::Value,
},
CodecPlan::Primitive(primitive) => WriteSeq {
size: SizeExpr::Fixed(primitive.wire_size_bytes()),
ops: vec![WriteOp::Primitive {
primitive: *primitive,
value: value.clone(),
}],
shape: WireShape::Value,
},
CodecPlan::String => WriteSeq {
size: SizeExpr::Sum(vec![SizeExpr::Fixed(4), SizeExpr::StringLen(value.clone())]),
ops: vec![WriteOp::String {
value: value.clone(),
}],
shape: WireShape::Value,
},
CodecPlan::Bytes => WriteSeq {
size: SizeExpr::Sum(vec![SizeExpr::Fixed(4), SizeExpr::BytesLen(value.clone())]),
ops: vec![WriteOp::Bytes {
value: value.clone(),
}],
shape: WireShape::Value,
},
CodecPlan::Builtin(id) => WriteSeq {
size: self
.builtin_fixed_size(id)
.map(SizeExpr::Fixed)
.unwrap_or_else(|| {
if id.as_str() == "Url" {
SizeExpr::Sum(vec![
SizeExpr::Fixed(4),
SizeExpr::BuiltinSize {
id: id.clone(),
value: value.clone(),
},
])
} else {
SizeExpr::WireSize {
value: value.clone(),
owner: None,
}
}
}),
ops: vec![WriteOp::Builtin {
id: id.clone(),
value: value.clone(),
}],
shape: WireShape::Value,
},
CodecPlan::Option(inner) => {
let inner_seq = self.expand_encode(inner, ValueExpr::Var("v".into()));
WriteSeq {
size: SizeExpr::OptionSize {
value: value.clone(),
inner: Box::new(inner_seq.size.clone()),
},
ops: vec![WriteOp::Option {
value: value.clone(),
some: Box::new(inner_seq),
}],
shape: WireShape::Optional,
}
}
CodecPlan::Vec { element, layout } => {
let element_seq = self.expand_encode(element, ValueExpr::Var("item".into()));
let size_expr =
if matches!(element.as_ref(), CodecPlan::Primitive(PrimitiveType::U8)) {
SizeExpr::Sum(vec![SizeExpr::Fixed(4), SizeExpr::BytesLen(value.clone())])
} else {
SizeExpr::VecSize {
value: value.clone(),
inner: Box::new(element_seq.size.clone()),
layout: layout.clone(),
}
};
WriteSeq {
size: size_expr,
ops: vec![WriteOp::Vec {
value: value.clone(),
element_type: TypeExpr::from(element.as_ref()),
element: Box::new(element_seq),
layout: layout.clone(),
}],
shape: WireShape::Sequence,
}
}
CodecPlan::Result { ok, err } => {
let ok_seq = self.expand_encode(ok, ValueExpr::Var("okVal".into()));
let err_seq = self.expand_encode(err, ValueExpr::Var("errVal".into()));
WriteSeq {
size: SizeExpr::ResultSize {
value: value.clone(),
ok: Box::new(ok_seq.size.clone()),
err: Box::new(err_seq.size.clone()),
},
ops: vec![WriteOp::Result {
value: value.clone(),
ok: Box::new(ok_seq),
err: Box::new(err_seq),
}],
shape: WireShape::Value,
}
}
CodecPlan::Record { id, layout } => {
let fields = match layout {
RecordLayout::Blittable { fields, .. } => fields
.iter()
.map(|field| {
let field_value = value.field(field.name.clone());
FieldWriteOp {
name: field.name.clone(),
accessor: field_value.clone(),
seq: self.expand_encode(
&CodecPlan::Primitive(field.primitive),
field_value,
),
}
})
.collect(),
RecordLayout::Encoded { fields } => fields
.iter()
.map(|field| {
let field_value = value.field(field.name.clone());
FieldWriteOp {
name: field.name.clone(),
accessor: field_value.clone(),
seq: self.expand_encode(&field.codec, field_value),
}
})
.collect(),
RecordLayout::Recursive => vec![],
};
let size = match layout {
RecordLayout::Blittable { size, .. } => SizeExpr::Fixed(*size),
_ => SizeExpr::WireSize {
value: value.clone(),
owner: Some(WireSizeOwner::Record(id.clone())),
},
};
WriteSeq {
size,
ops: vec![WriteOp::Record {
id: id.clone(),
value: value.clone(),
fields,
}],
shape: WireShape::Value,
}
}
CodecPlan::Enum { id, layout } => {
let size = match layout {
EnumLayout::CStyle { .. } => SizeExpr::Fixed(4),
_ => SizeExpr::WireSize {
value: value.clone(),
owner: Some(WireSizeOwner::Enum(id.clone())),
},
};
WriteSeq {
size,
ops: vec![WriteOp::Enum {
id: id.clone(),
value: value.clone(),
layout: layout.clone(),
}],
shape: WireShape::Value,
}
}
CodecPlan::Custom { id, underlying } => {
let underlying_seq = self.expand_encode(underlying, value.clone());
WriteSeq {
size: underlying_seq.size.clone(),
ops: vec![WriteOp::Custom {
id: id.clone(),
value: value.clone(),
underlying: Box::new(underlying_seq),
}],
shape: WireShape::Value,
}
}
}
}
pub(super) fn builtin_fixed_size(&self, id: &BuiltinId) -> Option<usize> {
match id.as_str() {
"Duration" | "SystemTime" => Some(12),
"Uuid" => Some(16),
_ => None,
}
}
}