├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── README.md
├── examples
    ├── calculator.witx
    ├── errno.witx
    ├── using_add.wat
    └── using_add
    │   ├── Cargo.lock
    │   ├── Cargo.toml
    │   └── src
    │       └── lib.rs
└── src
    ├── calculator.rs
    └── main.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | target/
2 | 


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1610 | name = "wiggle-test"
1611 | version = "0.15.0"
1612 | source = "registry+https://github.com/rust-lang/crates.io-index"
1613 | checksum = "6b5139ea91ab620705dd6dc20341dbf0395e5d449877cc9fc6fe38652bd37c8f"
1614 | dependencies = [
1615 |  "proptest",
1616 |  "wiggle 0.15.0",
1617 | ]
1618 | 
1619 | [[package]]
1620 | name = "winapi"
1621 | version = "0.3.8"
1622 | source = "registry+https://github.com/rust-lang/crates.io-index"
1623 | checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
1624 | dependencies = [
1625 |  "winapi-i686-pc-windows-gnu",
1626 |  "winapi-x86_64-pc-windows-gnu",
1627 | ]
1628 | 
1629 | [[package]]
1630 | name = "winapi-i686-pc-windows-gnu"
1631 | version = "0.4.0"
1632 | source = "registry+https://github.com/rust-lang/crates.io-index"
1633 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
1634 | 
1635 | [[package]]
1636 | name = "winapi-util"
1637 | version = "0.1.5"
1638 | source = "registry+https://github.com/rust-lang/crates.io-index"
1639 | checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
1640 | dependencies = [
1641 |  "winapi",
1642 | ]
1643 | 
1644 | [[package]]
1645 | name = "winapi-x86_64-pc-windows-gnu"
1646 | version = "0.4.0"
1647 | source = "registry+https://github.com/rust-lang/crates.io-index"
1648 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
1649 | 
1650 | [[package]]
1651 | name = "winx"
1652 | version = "0.16.0"
1653 | source = "registry+https://github.com/rust-lang/crates.io-index"
1654 | checksum = "bd961a9c47fb866ee8289fa0917ac5e1c9c1145ec49572d7e434a69c7478d48a"
1655 | dependencies = [
1656 |  "bitflags",
1657 |  "cvt",
1658 |  "winapi",
1659 | ]
1660 | 
1661 | [[package]]
1662 | name = "witx"
1663 | version = "0.8.5"
1664 | source = "registry+https://github.com/rust-lang/crates.io-index"
1665 | checksum = "9cae706991db0527c4b60d87d5d0600b08f62018600315fbdb4c05d7dcd98b21"
1666 | dependencies = [
1667 |  "anyhow",
1668 |  "log",
1669 |  "thiserror",
1670 |  "wast 11.0.0",
1671 | ]
1672 | 
1673 | [[package]]
1674 | name = "yanix"
1675 | version = "0.16.0"
1676 | source = "registry+https://github.com/rust-lang/crates.io-index"
1677 | checksum = "7c9b1a7c85f9dcf48fadb129461dc1e54cdf82f6a52cb7ab3b53a4a4234d056f"
1678 | dependencies = [
1679 |  "bitflags",
1680 |  "cfg-if",
1681 |  "filetime",
1682 |  "libc",
1683 |  "log",
1684 | ]
1685 | 
1686 | [[package]]
1687 | name = "zstd"
1688 | version = "0.5.3+zstd.1.4.5"
1689 | source = "registry+https://github.com/rust-lang/crates.io-index"
1690 | checksum = "01b32eaf771efa709e8308605bbf9319bf485dc1503179ec0469b611937c0cd8"
1691 | dependencies = [
1692 |  "zstd-safe",
1693 | ]
1694 | 
1695 | [[package]]
1696 | name = "zstd-safe"
1697 | version = "2.0.5+zstd.1.4.5"
1698 | source = "registry+https://github.com/rust-lang/crates.io-index"
1699 | checksum = "1cfb642e0d27f64729a639c52db457e0ae906e7bc6f5fe8f5c453230400f1055"
1700 | dependencies = [
1701 |  "libc",
1702 |  "zstd-sys",
1703 | ]
1704 | 
1705 | [[package]]
1706 | name = "zstd-sys"
1707 | version = "1.4.17+zstd.1.4.5"
1708 | source = "registry+https://github.com/rust-lang/crates.io-index"
1709 | checksum = "b89249644df056b522696b1bb9e7c18c87e8ffa3e2f0dc3b0155875d6498f01b"
1710 | dependencies = [
1711 |  "cc",
1712 |  "glob",
1713 |  "itertools",
1714 |  "libc",
1715 | ]
1716 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "wasm-calc"
 3 | version = "0.1.0"
 4 | authors = ["Radu M <root@radu.sh>"]
 5 | edition = "2018"
 6 | 
 7 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 8 | 
 9 | [dependencies]
10 | anyhow = "1.0.19"
11 | wiggle = "0.16.0"
12 | wiggle-test = "0.15.0"
13 | proptest = "0.9"
14 | wasmtime = "0.16"
15 | wasmtime-wasi = "0.16"
16 | wasi-common = "0.16"
17 | wat = "1.0.18"
18 | wig = "0.16.0"


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # `wasm-calc`
2 | 
3 | Simple example of using WITX for writing a simple WebAssembly API.
4 | 


--------------------------------------------------------------------------------
/examples/calculator.witx:
--------------------------------------------------------------------------------
 1 | (use "errno.witx")
 2 | 
 3 | ;;; Add two integers
 4 | (module $calculator
 5 |   (@interface func (export "add")
 6 |     (param $lh s32)
 7 |     (param $rh s32)
 8 |     (result $error $errno)
 9 |     (result $res s32)
10 |   )
11 | )
12 | 


--------------------------------------------------------------------------------
/examples/errno.witx:
--------------------------------------------------------------------------------
1 | (typename $errno
2 |     (enum u32
3 |         ;;; Success
4 |         $ok
5 |         ;;; Invalid argument
6 |         $invalid_arg))
7 | 


--------------------------------------------------------------------------------
/examples/using_add.wat:
--------------------------------------------------------------------------------
 1 | (module
 2 |   (import "calculator" "add" (func $calc_add (param i32 i32) (result i32)))
 3 | 
 4 |   (func $consume_add (param $lhs i32) (param $rhs i32) (result i32)
 5 |     local.get $lhs
 6 |     local.get $rhs
 7 |     call $calc_add)
 8 |   (export "consume_add" (func $consume_add))
 9 | )
10 | 


--------------------------------------------------------------------------------
/examples/using_add/Cargo.lock:
--------------------------------------------------------------------------------
1 | # This file is automatically @generated by Cargo.
2 | # It is not intended for manual editing.
3 | [[package]]
4 | name = "using_add"
5 | version = "0.1.0"
6 | 


--------------------------------------------------------------------------------
/examples/using_add/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "using_add"
 3 | version = "0.1.0"
 4 | authors = ["Radu M <root@radu.sh>"]
 5 | edition = "2018"
 6 | 
 7 | [lib]
 8 | crate-type = ["cdylib"] # <-- this is the bit we need to add
 9 | 
10 | [dependencies]
11 | 


--------------------------------------------------------------------------------
/examples/using_add/src/lib.rs:
--------------------------------------------------------------------------------
 1 | #[link(wasm_import_module = "calculator")]
 2 | extern "C" {
 3 |     fn add(lh: i32, rh: i32) -> i32;
 4 | }
 5 | 
 6 | #[no_mangle]
 7 | pub unsafe extern "C" fn consume_add(lh: i32, rh: i32) -> i32 {
 8 |     add(lh, rh)
 9 | }
10 | 


--------------------------------------------------------------------------------
/src/calculator.rs:
--------------------------------------------------------------------------------
 1 | wiggle::from_witx!({
 2 |     witx: ["examples/calculator.witx"],
 3 |     ctx: CalculatorCtx,
 4 | });
 5 | 
 6 | pub struct CalculatorCtx {}
 7 | 
 8 | impl calculator::Calculator for CalculatorCtx {
 9 |     fn add(&self, lh: i32, rh: i32) -> Result<i32, types::Errno> {
10 |         Ok(lh + rh)
11 |     }
12 | }
13 | 
14 | impl wiggle::GuestErrorType for types::Errno {
15 |     fn success() -> Self {
16 |         unimplemented!()
17 |     }
18 | }
19 | 
20 | impl types::GuestErrorConversion for CalculatorCtx {
21 |     fn into_errno(&self, _e: wiggle::GuestError) -> types::Errno {
22 |         unimplemented!()
23 |     }
24 | }
25 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
  1 | use anyhow::{bail, Context as _, Result};
  2 | use std::path::Path;
  3 | use wasmtime::{Engine, Extern, Instance, Linker, Module, Store, Val, ValType};
  4 | use wasmtime_wasi::{old::snapshot_0::Wasi as WasiSnapshot0, Wasi};
  5 | 
  6 | use crate::calculator::calculator::Calculator;
  7 | 
  8 | mod calculator;
  9 | 
 10 | fn main() {
 11 |     let config = wasmtime::Config::new();
 12 |     let engine = Engine::new(&config);
 13 |     let store = Store::new(&engine);
 14 | 
 15 |     let args: Vec<String> = std::env::args().collect();
 16 |     let path = args.get(1).unwrap();
 17 |     let path = Path::new(path);
 18 |     let func_name = args.get(2).unwrap();
 19 | 
 20 |     let module_registry = ModuleRegistry::new(&store).unwrap();
 21 | 
 22 |     let instance = instantiate_module(&store, &module_registry, path).unwrap();
 23 |     let x = args[3..args.len()].to_vec();
 24 |     invoke_export(instance, func_name, x).unwrap()
 25 | }
 26 | 
 27 | fn instantiate_module(
 28 |     store: &Store,
 29 |     module_registry: &ModuleRegistry,
 30 |     path: &Path,
 31 | ) -> Result<Instance> {
 32 |     let data = wat::parse_file(path)?;
 33 |     let module = Module::new(store, &data)?;
 34 |     let mut linker = Linker::new(store);
 35 | 
 36 |     for (_, item) in module.imports().enumerate() {
 37 |         match item.module() {
 38 |             "wasi_snapshot_preview1" => {
 39 |                 linker.define(
 40 |                     "wasi_snapshot_preview1",
 41 |                     item.name(),
 42 |                     Extern::Func(
 43 |                         module_registry
 44 |                             .wasi_snapshot_preview1
 45 |                             .get_export(item.name())
 46 |                             .unwrap()
 47 |                             .clone(),
 48 |                     ),
 49 |                 )?;
 50 |             }
 51 |             "wasi_unstable" => {
 52 |                 linker.define(
 53 |                     "wasi_unstable",
 54 |                     item.name(),
 55 |                     Extern::Func(
 56 |                         module_registry
 57 |                             .wasi_unstable
 58 |                             .get_export(item.name())
 59 |                             .unwrap()
 60 |                             .clone(),
 61 |                     ),
 62 |                 )?;
 63 |             }
 64 |             _ => {}
 65 |         }
 66 |     }
 67 | 
 68 |     linker.func("calculator", "add", |x: i32, y: i32| {
 69 |         let ctx = calculator::CalculatorCtx {};
 70 |         ctx.add(x, y).unwrap()
 71 |     })?;
 72 | 
 73 |     linker.instantiate(&module)
 74 | }
 75 | 
 76 | fn invoke_export(instance: Instance, name: &str, args: Vec<String>) -> Result<()> {
 77 |     let func = if let Some(export) = instance.get_export(name) {
 78 |         if let Some(func) = export.into_func() {
 79 |             func
 80 |         } else {
 81 |             bail!("export of `{}` wasn't a function", name)
 82 |         }
 83 |     } else {
 84 |         bail!("failed to find export of `{}` in module", name)
 85 |     };
 86 | 
 87 |     let mut values = Vec::new();
 88 |     let mut x = args.iter();
 89 |     for ty in func.ty().params() {
 90 |         let val = match x.next() {
 91 |             Some(s) => s,
 92 |             None => bail!("baaah"),
 93 |         };
 94 |         values.push(match ty {
 95 |             ValType::I32 => Val::I32(val.parse()?),
 96 |             ValType::I64 => Val::I64(val.parse()?),
 97 |             ValType::F32 => Val::F32(val.parse()?),
 98 |             ValType::F64 => Val::F64(val.parse()?),
 99 |             t => bail!("unsupported argument type {:?}", t),
100 |         });
101 |     }
102 | 
103 |     let results = func
104 |         .call(&values)
105 |         .with_context(|| format!("failed to invoke `{}`", name))?;
106 | 
107 |     for result in results.into_vec() {
108 |         match result {
109 |             Val::I32(i) => println!("{}", i),
110 |             Val::I64(i) => println!("{}", i),
111 |             Val::F32(f) => println!("{}", f),
112 |             Val::F64(f) => println!("{}", f),
113 |             Val::FuncRef(_) => println!("<funcref>"),
114 |             Val::AnyRef(_) => println!("<anyref>"),
115 |             Val::V128(i) => println!("{}", i),
116 |         }
117 |     }
118 | 
119 |     Ok(())
120 | }
121 | 
122 | struct ModuleRegistry {
123 |     wasi_snapshot_preview1: Wasi,
124 |     wasi_unstable: WasiSnapshot0,
125 | }
126 | 
127 | impl ModuleRegistry {
128 |     fn new(store: &Store) -> Result<ModuleRegistry> {
129 |         let cx1 = wasi_common::WasiCtxBuilder::new()
130 |             .inherit_stdin()
131 |             .inherit_stdout()
132 |             .inherit_stderr()
133 |             .build()?;
134 |         let cx2 = wasi_common::old::snapshot_0::WasiCtxBuilder::new()
135 |             .inherit_stdin()
136 |             .inherit_stdout()
137 |             .inherit_stderr()
138 |             .build()?;
139 | 
140 |         Ok(ModuleRegistry {
141 |             wasi_snapshot_preview1: Wasi::new(store, cx1),
142 |             wasi_unstable: WasiSnapshot0::new(store, cx2),
143 |         })
144 |     }
145 | }
146 | 


--------------------------------------------------------------------------------