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Initial reorg.

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This is largely the same as #305, but updated for the current tree.
This commit is contained in:
Dan Gohman
2019-11-07 17:11:06 -08:00
parent 2c69546a24
commit 22641de629
351 changed files with 52 additions and 52 deletions
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20
crates/wasi-common/wig/Cargo.toml Normal file
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[package]
name = "wig"
version = "0.1.0"
authors = ["Dan Gohman <sunfish@mozilla.com>"]
edition = "2018"
categories = ["wasm"]
keywords = ["webassembly", "wasm"]
license = "Apache-2.0 WITH LLVM-exception"
repository = "https://github.com/CraneStation/wasmtime"
[lib]
proc-macro = true
[dependencies]
quote = "1.0.2"
proc-macro2 = "1.0.6"
# We include the WASI repo primarily for the witx files, but it's also useful
# to use the witx parser it contains, rather than the witx crate from
# crates.io, so that it always matches the version of the witx files.
witx = { path = "../WASI/tools/witx" }

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crates/wasi-common/wig/LICENSE Normal file
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crates/wasi-common/wig/src/lib.rs Normal file
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extern crate proc_macro;
extern crate proc_macro2;
extern crate quote;
extern crate witx;
mod raw_types;
mod utils;
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
#[proc_macro]
pub fn witx_host_types(args: TokenStream) -> TokenStream {
TokenStream::from(raw_types::gen(
TokenStream2::from(args),
raw_types::Mode::Host,
))
}
#[proc_macro]
pub fn witx_wasi_types(args: TokenStream) -> TokenStream {
TokenStream::from(raw_types::gen(
TokenStream2::from(args),
raw_types::Mode::Wasi,
))
}
#[proc_macro]
pub fn witx_wasi32_types(args: TokenStream) -> TokenStream {
TokenStream::from(raw_types::gen(
TokenStream2::from(args),
raw_types::Mode::Wasi32,
))
}

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crates/wasi-common/wig/src/raw_types.rs Normal file
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//! Translate witx types to Rust.
use crate::utils;
use proc_macro2::{Delimiter, Group, Literal, TokenStream, TokenTree};
use quote::{format_ident, quote};
use std::convert::TryFrom;
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Mode {
Host,
Wasi32,
Wasi,
}
impl Mode {
pub fn include_target_types(&self) -> bool {
match self {
Mode::Host | Mode::Wasi32 => true,
Mode::Wasi => false,
}
}
}
pub fn gen(args: TokenStream, mode: Mode) -> TokenStream {
let mut output = TokenStream::new();
let (path, _phase) = utils::witx_path_from_args(args);
let doc = match witx::load(&path) {
Ok(doc) => doc,
Err(e) => {
panic!("error opening file {}: {}", path, e);
}
};
gen_datatypes(&mut output, &doc, mode);
output
}
fn gen_datatypes(output: &mut TokenStream, doc: &witx::Document, mode: Mode) {
for datatype in doc.datatypes() {
if mode.include_target_types() != type_has_target_size(doc, &datatype) {
continue;
}
gen_datatype(output, doc, mode, &datatype);
}
}
fn gen_datatype(
output: &mut TokenStream,
doc: &witx::Document,
mode: Mode,
datatype: &witx::Datatype,
) {
match &datatype.variant {
witx::DatatypeVariant::Alias(a) => {
if a.name.as_str() == "size_t" {
let wasi_name = format_ident!("__wasi_{}", a.name.as_str());
match mode {
Mode::Host => output.extend(quote!(pub type #wasi_name = usize;)),
Mode::Wasi => panic!("size_t has target-specific size"),
Mode::Wasi32 => output.extend(quote!(pub type #wasi_name = u32;)),
}
} else {
let wasi_name = format_ident!("__wasi_{}", a.name.as_str());
let to = ident_tokens(mode, &a.to);
output.extend(quote!(pub type #wasi_name = #to;));
}
}
witx::DatatypeVariant::Enum(e) => {
let wasi_name = format_ident!("__wasi_{}", e.name.as_str());
let repr = int_repr_tokens(e.repr);
output.extend(quote!(pub type #wasi_name = #repr;));
for (index, variant) in e.variants.iter().enumerate() {
let value_name = format_ident!("__WASI_{}", variant.as_str());
let index_name = Literal::usize_unsuffixed(index);
output.extend(quote!(pub const #value_name: #wasi_name = #index_name;));
}
}
witx::DatatypeVariant::Flags(f) => {
let wasi_name = format_ident!("__wasi_{}", f.name.as_str());
let repr = int_repr_tokens(f.repr);
output.extend(quote!(pub type #wasi_name = #repr;));
for (index, flag) in f.flags.iter().enumerate() {
let value_name = format_ident!("__WASI_{}", flag.as_str());
let flag_value = Literal::u128_unsuffixed(
1u128
.checked_shl(u32::try_from(index).expect("flag value overflow"))
.expect("flag value overflow"),
);
output.extend(quote!(pub const #value_name: #wasi_name = #flag_value;));
}
}
witx::DatatypeVariant::Struct(s) => {
output.extend(quote!(#[repr(C)]));
// Types which contain unions can't trivially implement Debug,
// Hash, or Eq, because the type itself doesn't record which
// union member is active.
if struct_has_union(&doc, s) {
output.extend(quote!(#[derive(Copy, Clone)]));
output.extend(quote!(#[allow(missing_debug_implementations)]));
} else {
output.extend(quote!(#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq)]));
}
let wasi_name = format_ident!("__wasi_{}", s.name.as_str());
output.extend(quote!(pub struct #wasi_name));
let mut inner = TokenStream::new();
for member in &s.members {
let member_name = format_ident!("r#{}", member.name.as_str());
let member_type = ident_tokens(mode, &member.type_);
inner.extend(quote!(pub #member_name: #member_type,));
}
let braced = Group::new(Delimiter::Brace, inner);
output.extend(TokenStream::from(TokenTree::Group(braced)));
}
witx::DatatypeVariant::Union(u) => {
output.extend(quote!(#[repr(C)]));
output.extend(quote!(#[derive(Copy, Clone)]));
output.extend(quote!(#[allow(missing_debug_implementations)]));
let wasi_name = format_ident!("__wasi_{}", u.name.as_str());
output.extend(quote!(pub union #wasi_name));
let mut inner = TokenStream::new();
for variant in &u.variants {
let variant_name = format_ident!("r#{}", variant.name.as_str());
let variant_type = ident_tokens(mode, &variant.type_);
inner.extend(quote!(pub #variant_name: #variant_type,));
}
let braced = Group::new(Delimiter::Brace, inner);
output.extend(TokenStream::from(TokenTree::Group(braced)));
}
}
}
fn int_repr_tokens(int_repr: witx::IntRepr) -> TokenStream {
match int_repr {
witx::IntRepr::U8 => quote!(u8),
witx::IntRepr::U16 => quote!(u16),
witx::IntRepr::U32 => quote!(u32),
witx::IntRepr::U64 => quote!(u64),
}
}
fn builtin_tokens(mode: Mode, builtin: witx::BuiltinType) -> TokenStream {
match builtin {
witx::BuiltinType::String => match mode {
Mode::Host => quote!((*const u8, usize)),
Mode::Wasi => panic!("strings have target-specific size"),
Mode::Wasi32 => quote!((u32, u32)),
},
witx::BuiltinType::U8 => quote!(u8),
witx::BuiltinType::U16 => quote!(u16),
witx::BuiltinType::U32 => quote!(u32),
witx::BuiltinType::U64 => quote!(u64),
witx::BuiltinType::S8 => quote!(i8),
witx::BuiltinType::S16 => quote!(i16),
witx::BuiltinType::S32 => quote!(i32),
witx::BuiltinType::S64 => quote!(i64),
witx::BuiltinType::F32 => quote!(f32),
witx::BuiltinType::F64 => quote!(f64),
}
}
fn ident_tokens(mode: Mode, ident: &witx::DatatypeIdent) -> TokenStream {
match ident {
witx::DatatypeIdent::Builtin(builtin) => builtin_tokens(mode, *builtin),
witx::DatatypeIdent::Ident(ident) => TokenStream::from(TokenTree::Ident(format_ident!(
"__wasi_{}",
ident.name.as_str()
))),
witx::DatatypeIdent::Pointer(pointee) => {
let pointee = ident_tokens(mode, pointee);
match mode {
Mode::Host => quote!(*mut #pointee),
Mode::Wasi => panic!("pointers have target-specific size"),
Mode::Wasi32 => quote!(u32),
}
}
witx::DatatypeIdent::ConstPointer(pointee) => {
let pointee = ident_tokens(mode, pointee);
match mode {
Mode::Host => quote!(*const #pointee),
Mode::Wasi => panic!("pointers have target-specific size"),
Mode::Wasi32 => quote!(u32),
}
}
witx::DatatypeIdent::Array(element) => {
let element_name = ident_tokens(mode, element);
match mode {
Mode::Host => quote!((*const #element_name, usize)),
Mode::Wasi => panic!("arrays have target-specific size"),
Mode::Wasi32 => quote!((u32, u32)),
}
}
}
}
/// Test whether the given struct contains any union members.
fn struct_has_union(doc: &witx::Document, s: &witx::StructDatatype) -> bool {
s.members.iter().any(|member| match &member.type_ {
witx::DatatypeIdent::Ident(ident) => match &doc.datatype(&ident.name).unwrap().variant {
witx::DatatypeVariant::Union(_) => true,
witx::DatatypeVariant::Struct(s) => struct_has_union(doc, &s),
_ => false,
},
_ => false,
})
}
/// Test whether the given type has a target-specific size.
fn type_has_target_size(doc: &witx::Document, type_: &witx::Datatype) -> bool {
match &type_.variant {
witx::DatatypeVariant::Alias(a) => {
a.name.as_str() == "size_t" || ident_has_target_size(doc, &a.to)
}
witx::DatatypeVariant::Enum(_) => false,
witx::DatatypeVariant::Flags(_) => false,
witx::DatatypeVariant::Struct(s) => s
.members
.iter()
.any(|m| ident_has_target_size(doc, &m.type_)),
witx::DatatypeVariant::Union(u) => u
.variants
.iter()
.any(|v| ident_has_target_size(doc, &v.type_)),
}
}
/// Test whether the given type ident has a target-specific size.
fn ident_has_target_size(doc: &witx::Document, ident: &witx::DatatypeIdent) -> bool {
match ident {
witx::DatatypeIdent::Ident(ident) => {
type_has_target_size(doc, &doc.datatype(&ident.name).unwrap())
}
witx::DatatypeIdent::Builtin(builtin) => {
if let witx::BuiltinType::String = builtin {
true
} else {
false
}
}
witx::DatatypeIdent::Pointer(_) | witx::DatatypeIdent::ConstPointer(_) => true,
witx::DatatypeIdent::Array(element) => ident_has_target_size(doc, element),
}
}

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use proc_macro2::{Literal, TokenStream, TokenTree};
/// Given the input tokens to a macro invocation, return the path to the
/// witx file to process.
pub(crate) fn witx_path_from_args(args: TokenStream) -> (String, String) {
let mut strings = Vec::new();
for arg in args {
if let TokenTree::Literal(literal) = arg {
let parsed = parse_string_literal(literal);
strings.push(parsed);
} else {
panic!("arguments must be string literals");
}
}
if strings.len() != 2 {
panic!("expected two string literals");
}
let phase = &strings[0];
let id = &strings[1];
let path = witx_path(phase, id);
(path, phase.clone())
}
fn witx_path(phase: &str, id: &str) -> String {
let root = std::env::var("CARGO_MANIFEST_DIR").unwrap_or(".".into());
format!("{}/WASI/phases/{}/witx/{}.witx", root, phase, id)
}
// Convert a `Literal` holding a string literal into the `String`.
//
// FIXME: It feels like there should be an easier way to do this.
fn parse_string_literal(literal: Literal) -> String {
let s = literal.to_string();
assert!(
s.starts_with('"') && s.ends_with('"'),
"string literal must be enclosed in double-quotes"
);
let trimmed = s[1..s.len() - 1].to_owned();
assert!(
!trimmed.contains('"'),
"string literal must not contain embedded quotes for now"
);
assert!(
!trimmed.contains('\\'),
"string literal must not contain embedded backslashes for now"
);
trimmed
}