init

.appveyor.yml

@@ -0,0 +1,11 @@
+install:
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - if not defined RUSTFLAGS rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain nightly
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustc -V
+  - cargo -V
+
+build: false
+
+test_script:
+  - cargo test --locked

.gitignore

@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "extern/fadec"]
+	path = extern/fadec
+	url = https://github.com/aengelke/fadec.git

.travis.yml

@@ -0,0 +1,69 @@
+language: rust
+sudo: false
+
+cache: cargo
+
+matrix:
+  include:
+
+  # Builds with wasm-pack.
+  - rust: beta
+    env: RUST_BACKTRACE=1
+    addons:
+      firefox: latest
+      chrome: stable
+    before_script:
+      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
+      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
+      - cargo install-update -a
+      - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh -s -- -f
+    script:
+      - cargo generate --git . --name testing
+      # Having a broken Cargo.toml (in that it has curlies in fields) anywhere
+      # in any of our parent dirs is problematic.
+      - mv Cargo.toml Cargo.toml.tmpl
+      - cd testing
+      - wasm-pack build
+      - wasm-pack test --chrome --firefox --headless
+
+  # Builds on nightly.
+  - rust: nightly
+    env: RUST_BACKTRACE=1
+    before_script:
+      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
+      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
+      - cargo install-update -a
+      - rustup target add wasm32-unknown-unknown
+    script:
+      - cargo generate --git . --name testing
+      - mv Cargo.toml Cargo.toml.tmpl
+      - cd testing
+      - cargo check
+      - cargo check --target wasm32-unknown-unknown
+      - cargo check                                 --no-default-features
+      - cargo check --target wasm32-unknown-unknown --no-default-features
+      - cargo check                                 --no-default-features --features console_error_panic_hook
+      - cargo check --target wasm32-unknown-unknown --no-default-features --features console_error_panic_hook
+      - cargo check                                 --no-default-features --features "console_error_panic_hook wee_alloc"
+      - cargo check --target wasm32-unknown-unknown --no-default-features --features "console_error_panic_hook wee_alloc"
+
+  # Builds on beta.
+  - rust: beta
+    env: RUST_BACKTRACE=1
+    before_script:
+      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
+      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
+      - cargo install-update -a
+      - rustup target add wasm32-unknown-unknown
+    script:
+      - cargo generate --git . --name testing
+      - mv Cargo.toml Cargo.toml.tmpl
+      - cd testing
+      - cargo check
+      - cargo check --target wasm32-unknown-unknown
+      - cargo check                                 --no-default-features
+      - cargo check --target wasm32-unknown-unknown --no-default-features
+      - cargo check                                 --no-default-features --features console_error_panic_hook
+      - cargo check --target wasm32-unknown-unknown --no-default-features --features console_error_panic_hook
+      # Note: no enabling the `wee_alloc` feature here because it requires
+      # nightly for now.

Cargo.toml

@@ -0,0 +1,38 @@
+[package]
+name = "rust-as"
+version = "0.1.0"
+authors = ["T0b1 <T0b1-iOS@users.noreply.github.com>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.63"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.6", optional = true }
+
+# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
+# compared to the default allocator's ~10K. It is slower than the default
+# allocator, however.
+wee_alloc = { version = "0.4.5", optional = true }
+
+phf = { version = "0.11", features = ["macros"] }
+
+[build-dependencies]
+meson-next = "1.2.2"
+bindgen = "0.65.1"
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.13"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"

LICENSE_APACHE

@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
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+   and distribution as defined by Sections 1 through 9 of this document.
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+
+   "You" (or "Your") shall mean an individual or Legal Entity
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+   any Contribution intentionally submitted for inclusion in the Work
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+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
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+
+6. Trademarks. This License does not grant permission to use the trade
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+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
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+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
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+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
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+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
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+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

LICENSE_MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2018 T0b1 <T0b1-iOS@users.noreply.github.com>
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,86 @@
+<div align="center">
+
+  <h1><code>wasm-pack-template</code></h1>
+
+  <strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
+
+  <p>
+    <a href="https://travis-ci.org/rustwasm/wasm-pack-template"><img src="https://img.shields.io/travis/rustwasm/wasm-pack-template.svg?style=flat-square" alt="Build Status" /></a>
+  </p>
+
+  <h3>
+    <a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
+    <span> | </span>
+    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
+  </h3>
+
+  <sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
+</div>
+
+## About
+
+[**📚 Read this template tutorial! 📚**][template-docs]
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
+templates and usages of `wasm-pack`.
+
+[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
+[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
+
+## 🚴 Usage
+
+### 🐑 Use `cargo generate` to Clone this Template
+
+[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+
+```
+cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
+cd my-project
+```
+
+### 🛠️ Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### 🔬 Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### 🎁 Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```
+
+## 🔋 Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
+  for small code size.
+* `LICENSE-APACHE` and `LICENSE-MIT`: most Rust projects are licensed this way, so these are included for you
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.

build.rs

@@ -0,0 +1,92 @@
+use std::collections::HashMap;
+use std::env;
+use std::path::PathBuf;
+
+#[derive(Debug)]
+struct ParseCallback();
+
+impl bindgen::callbacks::ParseCallbacks for ParseCallback {
+    fn enum_variant_name(
+            &self,
+            enum_name: Option<&str>,
+            original_variant_name: &str,
+            _variant_value: bindgen::callbacks::EnumVariantValue,
+        ) -> Option<String> {
+        if let Some(name) = enum_name {
+            if name == "FeReg" {
+                return Some(original_variant_name.strip_prefix("FE_").unwrap_or(original_variant_name).to_owned());
+            }
+        }
+
+        None
+    }
+
+    fn will_parse_macro(&self, name: &str) -> bindgen::callbacks::MacroParsingBehavior {
+        if name == "FE_ADDR32"  || name == "FE_NOREG" || name == "FE_JMPL" {
+            return bindgen::callbacks::MacroParsingBehavior::Default;
+        }
+
+        if name.starts_with("FE_") {
+            // prevent instructions from being parsed
+            return bindgen::callbacks::MacroParsingBehavior::Ignore;
+        }
+
+        return bindgen::callbacks::MacroParsingBehavior::Default;
+    }
+}
+
+
+
+fn main() {
+    let build_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("fadec-build");
+    let build_path = build_path.to_str().unwrap();
+
+    // build faenc
+    {
+        let mut config = HashMap::new();
+        config.insert("wasm_build", "true");
+        let config = meson_next::config::Config::new().options(config);
+
+        println!("cargo:rustc-link-lib=fadec");
+        println!("cargo:rustc-link-search=native={}", build_path);
+        meson_next::build("extern/fadec", build_path, config);
+    }
+
+    // Tell cargo to invalidate the built crate whenever the wrapper changes
+    println!("cargo:rerun-if-changed=extern/fadec");
+
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    let bindings = bindgen::Builder::default()
+        // The input header we would like to generate
+        // bindings for.
+        .header("extern/fadec/fadec-enc.h")
+        .clang_arg(&format!("-I{}", build_path))
+        .rustified_enum("FeReg")
+        .parse_callbacks(Box::new(ParseCallback()))
+        // Tell cargo to invalidate the built crate whenever any of the
+        // included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        // Finish the builder and generate the bindings.
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+
+    // you wouldn't expect it but bindgen refuses to parse a file that does not end with '.h'
+    // lmao
+    std::fs::copy(format!("{}/fadec-encode-public.inc", build_path), format!("{}/fadec-encode-public.h", build_path)).expect("copy failed");
+
+    let inst_bindings = bindgen::Builder::default()
+        .header(format!("{}/fadec-encode-public.h", build_path))
+        .generate()
+        .expect("Unable to generate bindings");
+
+    inst_bindings.write_to_file(out_path.join("inst_bindings.rs")).expect("Couldn't write inst_bindings!");
+}

src/faenc.rs

@@ -0,0 +1,97 @@
+mod defs {
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(dead_code)]
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+}
+
+pub mod insts {
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(dead_code)]
+include!(concat!(env!("OUT_DIR"), "/inst_bindings.rs"));
+}
+
+pub use defs::{FeReg, FeOp, FE_ADDR32, FE_NOREG, FE_JMPL};
+
+// this does not seem to be defined by bindgen on wasm?
+#[cfg(target_arch = "wasm32")]
+extern "C" {
+    pub fn fe_enc64_impl(buf: *mut *mut u8, mnem: u64, op0: FeOp, op1: FeOp, op2: FeOp, op3: FeOp) -> core::ffi::c_int;
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+use defs::fe_enc64_impl;
+
+/*impl Into<FeOp> for FeReg {
+    fn into(self) -> FeOp {
+        self as FeOp
+    }
+}*/
+
+impl From<FeReg> for FeOp {
+    fn from(value: FeReg) -> Self {
+        value as FeOp
+    }
+}
+
+pub fn fe_mem(base: Option<FeReg>, scale: u8, idx: Option<FeReg>, off: i32) -> FeOp {
+    let base = (base.map(|x| x as i64).unwrap_or(0) & 0xFFF) << 32;
+    let idx = (idx.map(|x| x as i64).unwrap_or(0) & 0xFFF) << 44;
+    let sc = ((scale & 0xF) as i64) << 56;
+    i64::MIN | base | idx | sc | (off as i64) & 0xFFFFFFFF
+}
+
+pub fn fe_seg(seg: u64) -> u64 {
+    ((seg & 0x7) + 1) << 29
+}
+
+pub fn fe_mask(kreg: u64) -> u64 {
+    (kreg & 0x7) << 33
+}
+
+pub fn fe_maskz(kreg: u64) -> u64 {
+    ((kreg & 0x7) << 33) | 0x1000000000
+}
+
+pub unsafe fn fe_enc64_0(buf_ptr: *mut *mut u8, mnem: u64) -> Result<(), core::ffi::c_int> {
+    let res = fe_enc64_impl(buf_ptr, mnem, 0, 0, 0, 0);
+    match res {
+        0 => Ok(()),
+        x => Err(x)
+    }
+}
+
+pub unsafe fn fe_enc64_1(buf_ptr: *mut *mut u8, mnem: u64, op0: FeOp) -> Result<(), core::ffi::c_int> {
+    let res = fe_enc64_impl(buf_ptr, mnem, op0, 0, 0, 0);
+    match res {
+        0 => Ok(()),
+        x => Err(x)
+    }
+}
+
+pub unsafe fn fe_enc64_2(buf_ptr: *mut *mut u8, mnem: u64, op0: FeOp, op1: FeOp) -> Result<(), core::ffi::c_int> {
+    let res = fe_enc64_impl(buf_ptr, mnem, op0, op1, 0, 0);
+    match res {
+        0 => Ok(()),
+        x => Err(x)
+    }
+}
+
+pub unsafe fn fe_enc64_3(buf_ptr: *mut *mut u8, mnem: u64, op0: FeOp, op1: FeOp, op2: FeOp) -> Result<(), core::ffi::c_int> {
+    let res = fe_enc64_impl(buf_ptr, mnem, op0, op1, op2, 0);
+    match res {
+        0 => Ok(()),
+        x => Err(x)
+    }
+}
+
+pub unsafe fn fe_enc64_4(buf_ptr: *mut *mut u8, mnem: u64, op0: FeOp, op1: FeOp, op2: FeOp, op3: FeOp) -> Result<(), core::ffi::c_int> {
+    let res = fe_enc64_impl(buf_ptr, mnem, op0, op1, op2, op3);
+    match res {
+        0 => Ok(()),
+        x => Err(x)
+    }
+}

src/lib.rs

@@ -0,0 +1,125 @@
+mod utils;
+
+use wasm_bindgen::prelude::*;
+
+// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
+// allocator.
+#[cfg(feature = "wee_alloc")]
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+
+mod faenc;
+mod op_defs;
+
+use faenc::fe_enc64_1;
+use faenc::FeReg;
+use faenc::insts;
+
+
+#[wasm_bindgen]
+pub fn greet() {
+    let mut buf = [0u8; 16];
+    unsafe {
+        let mut write_ptr = buf.as_mut_ptr();
+
+        fe_enc64_1(&mut write_ptr, insts::FE_INC32r, FeReg::AX.into()).unwrap();
+    }
+
+    alert(&format!("Hello, rust-as: {:X?}", buf));
+}
+
+enum Operand {
+    Mem(u8, FeReg, u8, FeReg, i32), // width, base, sc, idx, off
+    Reg(u8, FeReg), // width
+    Imm(i64),
+}
+
+#[wasm_bindgen]
+pub fn parse_string(asm: &str) {
+    let mut enc_vec = Vec::<u8>::new();
+    enc_vec.resize(1024, 0);
+
+    let mut err_str = None;
+    for line in asm.lines() {
+        let line = line.trim();
+        // Remove comments
+        let line = match line.find(|c: char| c == '#' || c == ';') {
+            None => line,
+            Some(idx) => &line[..idx]
+        };
+        let line = match line.find("//") {
+            None => line,
+            Some(idx) => &line[..idx]
+        };
+        if line.is_empty() {
+            continue;
+        }
+
+        let line = line.trim();
+        let (mnem, ops_str) = match line.find(' ') {
+            None => {
+                // no operands instruction
+                err_str = Some("Instruction without op not supported".to_owned());
+                break;
+            },
+            Some(idx) => {
+                (&line[..idx], &line[idx+1..])
+            }
+        };
+
+        let op_strs: Vec<&str> = ops_str.split(',').map(|op| op.trim()).collect();
+        let mut ops = Vec::new();
+
+        for op_str in op_strs {
+            if let Some(first_space) = op_str.find(' ') {
+                let (first, op_str) = op_str.split_at(first_space);
+                let first = first.trim();
+                if let Some(second_space) = op_str.find(' ') {
+                    let (second, op_str) = op_str.split_at(second_space);
+
+                    if second.trim().eq_ignore_ascii_case("ptr") {
+                        let mut width = 0;
+                        if first.eq_ignore_ascii_case("byte") {
+                            width = 1;
+                        }
+                        if first.eq_ignore_ascii_case("word") {
+                            width = 2;
+                        }
+                        if first.eq_ignore_ascii_case("dword") {
+                            width = 4;
+                        }
+                        if first.eq_ignore_ascii_case("qword") {
+                            width = 8;
+                        }
+
+                        if width != 0 {
+                            // parse mem operand
+                            
+
+                        }
+                    }
+                }
+            }
+        }
+
+        if err_str.is_some() {
+            break;
+        }
+    }
+}
+
+
+fn parse_mem_op_inner(op_str: &str) -> Result<(FeReg, u8, FeReg, i32), String> {
+    let op_str = op_str.trim();
+    if op_str.is_empty() || op_str.chars().nth(0).unwrap() != '[' || op_str.chars().nth_back(0).unwrap() != ']' {
+        return Err("Expected memory operand".to_owned());
+    }
+
+
+    todo!("")
+}

src/op_defs.rs

@@ -0,0 +1,80 @@
+// The lookup table for mnemonics is divided into multiple hashmaps
+// There is one each for the operand combinations:
+// mem, reg, imm,
+// reg+reg, reg+mem, reg+imm, mem+reg, mem+imm,
+// reg+reg+reg, reg+reg+mem, reg+reg+imm, reg+mem+reg, reg+mem+imm, mem+reg+reg, mem+reg+imm
+// reg+reg+reg+reg, reg+reg+reg+imm, reg+reg+mem+imm, reg+reg+mem+reg
+
+use std::num::NonZeroU64;
+use phf::phf_map;
+
+use crate::faenc::FeOp;
+
+struct OpDef {
+    byte_op: Option<NonZeroU64>,
+    word_op: Option<NonZeroU64>,
+    dword_op: Option<NonZeroU64>,
+    qword_op: Option<NonZeroU64>,
+    // TODO: extra lookup for SSE+ ops?
+    op_128: Option<NonZeroU64>,
+    op_256: Option<NonZeroU64>,
+    op_512: Option<NonZeroU64>,
+}
+
+impl OpDef {
+    const fn d4(byte_op: u64, word_op: u64, dword_op: u64, qword_op: u64) -> Self {
+        unsafe {
+            let byte_op = if byte_op == 0 {
+                None
+            } else {
+                Some(NonZeroU64::new_unchecked(byte_op))
+            };
+            let word_op = if word_op == 0 {
+                None
+            } else {
+                Some(NonZeroU64::new_unchecked(word_op))
+            };
+            let dword_op = if dword_op == 0 {
+                None
+            } else {
+                Some(NonZeroU64::new_unchecked(dword_op))
+            };
+            let qword_op = if qword_op == 0 {
+                None
+            } else {
+                Some(NonZeroU64::new_unchecked(qword_op))
+            };
+            Self {
+                byte_op,
+                word_op,
+                dword_op,
+                qword_op,
+                op_128: None,
+                op_256: None,
+                op_512: None
+            }
+        }
+    }
+}
+
+// No checks done by default
+struct OpDefMem {
+    def: OpDef,
+    encoding_fn: Option<fn(def: &'static OpDefMem, mem: FeOp, buf_ptr: *mut *mut u8) -> bool>,
+}
+
+impl OpDefMem {
+    const fn d4(encoding_fn: Option<fn(def: &'static OpDefMem, mem: FeOp, buf_ptr: *mut *mut u8) -> bool>, byte_op: u64, word_op: u64, dword_op: u64, qword_op: u64) -> Self {
+        Self {
+            def: OpDef::d4(byte_op, word_op, dword_op, qword_op),
+            encoding_fn
+        }
+    }
+}
+
+use crate::faenc::insts::*;
+
+static MAP_MEM: phf::Map<&'static str, OpDefMem> = phf_map! {
+    "mul" => OpDefMem::d4(None, FE_MUL8m, FE_MUL16m, FE_MUL32m, FE_MUL64m),
+    "push" => OpDefMem::d4(None, 0, FE_PUSH16m, 0, FE_PUSHm),
+};

src/utils.rs

@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}

tests/web.rs

@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}

www/test.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+    <body>
+        <script type="module">
+            import init from "../pkg/rust_as.js";
+            let wasm = await init("../pkg/rust_as_bg.wasm");
+
+            console.log(wasm);
+            wasm.greet();
+
+        </script>
+    </body>
+</html>