use std::collections::HashMap;
use crate::constant_hash::generate_table;
use cranelift_codegen_shared::constant_hash::simple_hash;
use crate::cdsl::camel_case;
use crate::cdsl::settings::{
BoolSetting, Predicate, Preset, Setting, SettingGroup, SpecificSetting,
};
use crate::error;
use crate::srcgen::{Formatter, Match};
use crate::unique_table::UniqueSeqTable;
pub(crate) enum ParentGroup {
None,
Shared,
}
fn gen_constructor(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatter) {
let args = match parent {
ParentGroup::None => "builder: Builder",
ParentGroup::Shared => "shared: &settings::Flags, builder: &Builder",
};
fmtln!(fmt, "impl Flags {");
fmt.indent(|fmt| {
fmt.doc_comment(format!("Create flags {} settings group.", group.name));
fmtln!(fmt, "#[allow(unused_variables)]");
fmtln!(fmt, "pub fn new({}) -> Self {{", args);
fmt.indent(|fmt| {
fmtln!(fmt, "let bvec = builder.state_for(\"{}\");", group.name);
fmtln!(
fmt,
"let mut {} = Self {{ bytes: [0; {}] }};",
group.name,
group.byte_size()
);
fmtln!(
fmt,
"debug_assert_eq!(bvec.len(), {});",
group.settings_size
);
fmtln!(
fmt,
"{}.bytes[0..{}].copy_from_slice(&bvec);",
group.name,
group.settings_size
);
for p in &group.predicates {
fmt.comment(format!("Precompute #{}.", p.number));
fmtln!(fmt, "if {} {{", p.render(group));
fmt.indent(|fmt| {
fmtln!(
fmt,
"{}.bytes[{}] |= 1 << {};",
group.name,
group.bool_start_byte_offset + p.number / 8,
p.number % 8
);
});
fmtln!(fmt, "}");
}
fmtln!(fmt, group.name);
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
}
fn gen_iterator(group: &SettingGroup, fmt: &mut Formatter) {
fmtln!(fmt, "impl Flags {");
fmt.indent(|fmt| {
fmt.doc_comment("Iterates the setting values.");
fmtln!(fmt, "pub fn iter(&self) -> impl Iterator<Item = Value> {");
fmt.indent(|fmt| {
fmtln!(fmt, "let mut bytes = [0; {}];", group.settings_size);
fmtln!(fmt, "bytes.copy_from_slice(&self.bytes[0..{}]);", group.settings_size);
fmtln!(fmt, "DESCRIPTORS.iter().filter_map(move |d| {");
fmt.indent(|fmt| {
fmtln!(fmt, "let values = match &d.detail {");
fmt.indent(|fmt| {
fmtln!(fmt, "detail::Detail::Preset => return None,");
fmtln!(fmt, "detail::Detail::Enum { last, enumerators } => Some(TEMPLATE.enums(*last, *enumerators)),");
fmtln!(fmt, "_ => None");
});
fmtln!(fmt, "};");
fmtln!(fmt, "Some(Value{ name: d.name, detail: d.detail, values, value: bytes[d.offset as usize] })");
});
fmtln!(fmt, "})");
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
}
fn gen_enum_all(name: &str, values: &[&'static str], fmt: &mut Formatter) {
fmtln!(
fmt,
"/// Returns a slice with all possible [{}] values.",
name
);
fmtln!(fmt, "pub fn all() -> &'static [{}] {{", name);
fmt.indent(|fmt| {
fmtln!(fmt, "&[");
fmt.indent(|fmt| {
for v in values.iter() {
fmtln!(fmt, "Self::{},", camel_case(v));
}
});
fmtln!(fmt, "]");
});
fmtln!(fmt, "}");
}
fn gen_to_and_from_str(name: &str, values: &[&'static str], fmt: &mut Formatter) {
fmtln!(fmt, "impl fmt::Display for {} {{", name);
fmt.indent(|fmt| {
fmtln!(
fmt,
"fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {"
);
fmt.indent(|fmt| {
fmtln!(fmt, "f.write_str(match *self {");
fmt.indent(|fmt| {
for v in values.iter() {
fmtln!(fmt, "Self::{} => \"{}\",", camel_case(v), v);
}
});
fmtln!(fmt, "})");
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
fmtln!(fmt, "impl core::str::FromStr for {} {{", name);
fmt.indent(|fmt| {
fmtln!(fmt, "type Err = ();");
fmtln!(fmt, "fn from_str(s: &str) -> Result<Self, Self::Err> {");
fmt.indent(|fmt| {
fmtln!(fmt, "match s {");
fmt.indent(|fmt| {
for v in values.iter() {
fmtln!(fmt, "\"{}\" => Ok(Self::{}),", v, camel_case(v));
}
fmtln!(fmt, "_ => Err(()),");
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
}
fn gen_enum_types(group: &SettingGroup, fmt: &mut Formatter) {
for setting in group.settings.iter() {
let values = match setting.specific {
SpecificSetting::Bool(_) | SpecificSetting::Num(_) => continue,
SpecificSetting::Enum(ref values) => values,
};
let name = camel_case(setting.name);
fmt.doc_comment(format!("Values for `{}.{}`.", group.name, setting.name));
fmtln!(fmt, "#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]");
fmtln!(fmt, "pub enum {} {{", name);
fmt.indent(|fmt| {
for v in values.iter() {
fmt.doc_comment(format!("`{}`.", v));
fmtln!(fmt, "{},", camel_case(v));
}
});
fmtln!(fmt, "}");
fmtln!(fmt, "impl {} {{", name);
fmt.indent(|fmt| {
gen_enum_all(&name, values, fmt);
});
fmtln!(fmt, "}");
gen_to_and_from_str(&name, values, fmt);
}
}
fn gen_getter(setting: &Setting, fmt: &mut Formatter) {
fmt.doc_comment(format!("{}\n{}", setting.description, setting.comment));
match setting.specific {
SpecificSetting::Bool(BoolSetting {
predicate_number, ..
}) => {
fmtln!(fmt, "pub fn {}(&self) -> bool {{", setting.name);
fmt.indent(|fmt| {
fmtln!(fmt, "self.numbered_predicate({})", predicate_number);
});
fmtln!(fmt, "}");
}
SpecificSetting::Enum(ref values) => {
let ty = camel_case(setting.name);
fmtln!(fmt, "pub fn {}(&self) -> {} {{", setting.name, ty);
fmt.indent(|fmt| {
let mut m = Match::new(format!("self.bytes[{}]", setting.byte_offset));
for (i, v) in values.iter().enumerate() {
m.arm_no_fields(format!("{}", i), format!("{}::{}", ty, camel_case(v)));
}
m.arm_no_fields("_", "panic!(\"Invalid enum value\")");
fmt.add_match(m);
});
fmtln!(fmt, "}");
}
SpecificSetting::Num(_) => {
fmtln!(fmt, "pub fn {}(&self) -> u8 {{", setting.name);
fmt.indent(|fmt| {
fmtln!(fmt, "self.bytes[{}]", setting.byte_offset);
});
fmtln!(fmt, "}");
}
}
}
fn gen_pred_getter(predicate: &Predicate, group: &SettingGroup, fmt: &mut Formatter) {
fmt.doc_comment(format!("Computed predicate `{}`.", predicate.render(group)));
fmtln!(fmt, "pub fn {}(&self) -> bool {{", predicate.name);
fmt.indent(|fmt| {
fmtln!(fmt, "self.numbered_predicate({})", predicate.number);
});
fmtln!(fmt, "}");
}
fn gen_getters(group: &SettingGroup, fmt: &mut Formatter) {
fmt.doc_comment("User-defined settings.");
fmtln!(fmt, "#[allow(dead_code)]");
fmtln!(fmt, "impl Flags {");
fmt.indent(|fmt| {
fmt.doc_comment("Get a view of the boolean predicates.");
fmtln!(
fmt,
"pub fn predicate_view(&self) -> crate::settings::PredicateView {"
);
fmt.indent(|fmt| {
fmtln!(
fmt,
"crate::settings::PredicateView::new(&self.bytes[{}..])",
group.bool_start_byte_offset
);
});
fmtln!(fmt, "}");
if !group.settings.is_empty() {
fmt.doc_comment("Dynamic numbered predicate getter.");
fmtln!(fmt, "fn numbered_predicate(&self, p: usize) -> bool {");
fmt.indent(|fmt| {
fmtln!(
fmt,
"self.bytes[{} + p / 8] & (1 << (p % 8)) != 0",
group.bool_start_byte_offset
);
});
fmtln!(fmt, "}");
}
for setting in &group.settings {
gen_getter(setting, fmt);
}
for predicate in &group.predicates {
gen_pred_getter(predicate, group, fmt);
}
});
fmtln!(fmt, "}");
}
#[derive(Hash, PartialEq, Eq)]
enum SettingOrPreset<'a> {
Setting(&'a Setting),
Preset(&'a Preset),
}
impl<'a> SettingOrPreset<'a> {
fn name(&self) -> &str {
match *self {
SettingOrPreset::Setting(s) => s.name,
SettingOrPreset::Preset(p) => p.name,
}
}
}
fn gen_descriptors(group: &SettingGroup, fmt: &mut Formatter) {
let mut enum_table = UniqueSeqTable::new();
let mut descriptor_index_map: HashMap<SettingOrPreset, usize> = HashMap::new();
fmtln!(
fmt,
"static DESCRIPTORS: [detail::Descriptor; {}] = [",
group.settings.len() + group.presets.len()
);
fmt.indent(|fmt| {
for (idx, setting) in group.settings.iter().enumerate() {
fmtln!(fmt, "detail::Descriptor {");
fmt.indent(|fmt| {
fmtln!(fmt, "name: \"{}\",", setting.name);
fmtln!(fmt, "description: \"{}\",", setting.description);
fmtln!(fmt, "offset: {},", setting.byte_offset);
match setting.specific {
SpecificSetting::Bool(BoolSetting { bit_offset, .. }) => {
fmtln!(
fmt,
"detail: detail::Detail::Bool {{ bit: {} }},",
bit_offset
);
}
SpecificSetting::Enum(ref values) => {
let offset = enum_table.add(values);
fmtln!(
fmt,
"detail: detail::Detail::Enum {{ last: {}, enumerators: {} }},",
values.len() - 1,
offset
);
}
SpecificSetting::Num(_) => {
fmtln!(fmt, "detail: detail::Detail::Num,");
}
}
descriptor_index_map.insert(SettingOrPreset::Setting(setting), idx);
});
fmtln!(fmt, "},");
}
for (idx, preset) in group.presets.iter().enumerate() {
fmtln!(fmt, "detail::Descriptor {");
fmt.indent(|fmt| {
fmtln!(fmt, "name: \"{}\",", preset.name);
fmtln!(fmt, "description: \"{}\",", preset.description);
fmtln!(fmt, "offset: {},", (idx as u8) * group.settings_size);
fmtln!(fmt, "detail: detail::Detail::Preset,");
});
fmtln!(fmt, "},");
let whole_idx = idx + group.settings.len();
descriptor_index_map.insert(SettingOrPreset::Preset(preset), whole_idx);
}
});
fmtln!(fmt, "];");
fmtln!(fmt, "static ENUMERATORS: [&str; {}] = [", enum_table.len());
fmt.indent(|fmt| {
for enum_val in enum_table.iter() {
fmtln!(fmt, "\"{}\",", enum_val);
}
});
fmtln!(fmt, "];");
let mut hash_entries: Vec<SettingOrPreset> = Vec::new();
hash_entries.extend(group.settings.iter().map(SettingOrPreset::Setting));
hash_entries.extend(group.presets.iter().map(SettingOrPreset::Preset));
let hash_table = generate_table(hash_entries.iter(), hash_entries.len(), |entry| {
simple_hash(entry.name())
});
fmtln!(fmt, "static HASH_TABLE: [u16; {}] = [", hash_table.len());
fmt.indent(|fmt| {
for h in &hash_table {
match *h {
Some(setting_or_preset) => fmtln!(
fmt,
"{},",
&descriptor_index_map
.get(setting_or_preset)
.unwrap()
.to_string()
),
None => fmtln!(fmt, "0xffff,"),
}
}
});
fmtln!(fmt, "];");
fmtln!(
fmt,
"static PRESETS: [(u8, u8); {}] = [",
group.presets.len() * (group.settings_size as usize)
);
fmt.indent(|fmt| {
for preset in &group.presets {
fmt.comment(format!(
"{}: {}",
preset.name,
preset.setting_names(group).collect::<Vec<_>>().join(", ")
));
for (mask, value) in preset.layout(group) {
fmtln!(fmt, "(0b{:08b}, 0b{:08b}),", mask, value);
}
}
});
fmtln!(fmt, "];");
}
fn gen_template(group: &SettingGroup, fmt: &mut Formatter) {
let mut default_bytes: Vec<u8> = vec![0; group.settings_size as usize];
for setting in &group.settings {
*default_bytes.get_mut(setting.byte_offset as usize).unwrap() |= setting.default_byte();
}
let default_bytes: Vec<String> = default_bytes
.iter()
.map(|x| format!("{:#04x}", x))
.collect();
let default_bytes_str = default_bytes.join(", ");
fmtln!(
fmt,
"static TEMPLATE: detail::Template = detail::Template {"
);
fmt.indent(|fmt| {
fmtln!(fmt, "name: \"{}\",", group.name);
fmtln!(fmt, "descriptors: &DESCRIPTORS,");
fmtln!(fmt, "enumerators: &ENUMERATORS,");
fmtln!(fmt, "hash_table: &HASH_TABLE,");
fmtln!(fmt, "defaults: &[{}],", default_bytes_str);
fmtln!(fmt, "presets: &PRESETS,");
});
fmtln!(fmt, "};");
fmt.doc_comment(format!(
"Create a `settings::Builder` for the {} settings group.",
group.name
));
fmtln!(fmt, "pub fn builder() -> Builder {");
fmt.indent(|fmt| {
fmtln!(fmt, "Builder::new(&TEMPLATE)");
});
fmtln!(fmt, "}");
}
fn gen_display(group: &SettingGroup, fmt: &mut Formatter) {
fmtln!(fmt, "impl fmt::Display for Flags {");
fmt.indent(|fmt| {
fmtln!(
fmt,
"fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {"
);
fmt.indent(|fmt| {
fmtln!(fmt, "writeln!(f, \"[{}]\")?;", group.name);
fmtln!(fmt, "for d in &DESCRIPTORS {");
fmt.indent(|fmt| {
fmtln!(fmt, "if !d.detail.is_preset() {");
fmt.indent(|fmt| {
fmtln!(fmt, "write!(f, \"{} = \", d.name)?;");
fmtln!(
fmt,
"TEMPLATE.format_toml_value(d.detail, self.bytes[d.offset as usize], f)?;",
);
fmtln!(fmt, "writeln!(f)?;");
});
fmtln!(fmt, "}");
});
fmtln!(fmt, "}");
fmtln!(fmt, "Ok(())");
});
fmtln!(fmt, "}")
});
fmtln!(fmt, "}");
}
fn gen_group(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatter) {
fmtln!(fmt, "#[derive(Clone, Hash)]");
fmt.doc_comment(format!("Flags group `{}`.", group.name));
fmtln!(fmt, "pub struct Flags {");
fmt.indent(|fmt| {
fmtln!(fmt, "bytes: [u8; {}],", group.byte_size());
});
fmtln!(fmt, "}");
gen_constructor(group, parent, fmt);
gen_iterator(group, fmt);
gen_enum_types(group, fmt);
gen_getters(group, fmt);
gen_descriptors(group, fmt);
gen_template(group, fmt);
gen_display(group, fmt);
}
pub(crate) fn generate(
settings: &SettingGroup,
parent_group: ParentGroup,
filename: &str,
out_dir: &std::path::Path,
) -> Result<(), error::Error> {
let mut fmt = Formatter::new();
gen_group(settings, parent_group, &mut fmt);
fmt.update_file(filename, out_dir)?;
Ok(())
}