Working with cargo

Cargo.toml

@@ -1,13 +1,19 @@
 [package]
-name = "stable_mir_pretty"
+name = "stable_mir_json"
 version = "0.1.0"
 edition = "2021"
+default-run = "stable_mir_json"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 dot-writer = "0.1.4"
-tracing = "0.1"
+anyhow = "1"
+home = "0.5"
+
+[[bin]]
+name = "cargo_stable_mir_json"
+path = "src/bin/cargo_stable_mir_json.rs"
 
 [package.metadata.rust-analyzer]
 # This package uses rustc crates.

README.md

@@ -64,3 +64,17 @@ To run the tests, do the following:
 ```shell
 make integration-test
 ```
+
+## Integration with `cargo`
+Currently the system to integrate with cargo is to create a `.stable_mir_json` package that contains the libraries, binaries, and run script for `stable_mir_json`. This run script ensures that the the same library that built `stable_mir_json` is used in the `cargo` project. Here are the steps required:
+
+1. Navigate to the project root of `stable_mir_json` and run
+```bash
+cargo run --bin cargo_stable_mir_json -- $PWD [OPTIONAL-PATH-FOR-DIR]
+```
+
+2. Navigate to `cargo` project and run
+```bash
+RUSTC=<PATH-TO-.stable_mir_json>/run.sh cargo build
+```
+NOTE: by default `<PATH-TO-.stable_mir_json>` is `~/.stable_mir_json`

src/bin/cargo_stable_mir_json.rs

@@ -0,0 +1,178 @@
+use std::env;
+
+use std::io::Write;
+use std::os::unix::fs::PermissionsExt;
+use std::path::{Path, PathBuf};
+
+use anyhow::{bail, Result};
+
+fn main() -> Result<()> {
+    let args: Vec<_> = env::args().collect();
+
+    let (repo_dir, maybe_user_provided_dir): (PathBuf, Option<PathBuf>) = match &args[..] {
+        [_, repo_dir] => (repo_dir.into(), None),
+        [_, repo_dir, user_provided_dir] => (repo_dir.into(), Some(user_provided_dir.into())),
+        _ => bail!("Usage: cargo run --bin cargo_stable_mir_json -- <PATH-TO-STABLE-MIR-JSON-REPO> [OPTIONAL-PATH-TO-CREATE-BUILD-DIR]"),
+    };
+
+    if !repo_dir.is_dir() {
+        bail!(
+            "Provided should be path to stable_mir_json repo, but {} is not a dir",
+            repo_dir.display()
+        );
+    }
+
+    if let Some(ref user_provided_dir) = maybe_user_provided_dir {
+        if !user_provided_dir.is_dir() {
+            bail!(
+                "Provided should be path to create the .stable_mir_json dir, but {} is not a dir",
+                user_provided_dir.display()
+            );
+        }
+    }
+
+    setup(repo_dir, maybe_user_provided_dir)
+}
+
+fn setup(repo_dir: PathBuf, maybe_user_provided_dir: Option<PathBuf>) -> Result<()> {
+    let smir_json_dir = smir_json_dir(maybe_user_provided_dir)?;
+    println!("Creating {} directory", smir_json_dir.display());
+    std::fs::create_dir(&smir_json_dir)?; // This errors is the directory already exists
+
+    copy_artefacts(&repo_dir, &smir_json_dir)?;
+
+    let ld_library_path = record_ld_library_path(&smir_json_dir)?;
+    add_run_script(&smir_json_dir, &ld_library_path)
+}
+
+fn smir_json_dir(maybe_user_provided_dir: Option<PathBuf>) -> Result<PathBuf> {
+    let user_provided_dir = match maybe_user_provided_dir {
+        Some(user_provided_dir) => user_provided_dir,
+        None => home::home_dir().expect("couldn't find home directory"),
+    };
+    if !user_provided_dir.is_dir() {
+        bail!(
+            // We know this is home because main checked user_provided_dir already
+            "got home directory `{}` which isn't a directory",
+            user_provided_dir.display()
+        );
+    }
+    let smir_json_dir = user_provided_dir.join(".stable_mir_json");
+    Ok(smir_json_dir)
+}
+
+fn copy_artefacts(repo_dir: &Path, smir_json_dir: &Path) -> Result<()> {
+    let dev_dir = repo_dir.join("target/debug/");
+    let dev_rlib = dev_dir.join("libstable_mir_json.rlib");
+
+    let release_dir = repo_dir.join("target/release/");
+    let release_rlib = release_dir.join("libstable_mir_json.rlib");
+
+    if !dev_rlib.exists() && !release_rlib.exists() {
+        bail!(
+            "Neither dev rlib `{}`, nor release rlib `{}` exists",
+            dev_dir.display(),
+            release_dir.display()
+        );
+    }
+
+    // Debug
+    if dev_rlib.exists() {
+        cp_artefacts_from_profile(smir_json_dir, Profile::Dev(repo_dir))?;
+    }
+
+    // Release
+    if release_rlib.exists() {
+        cp_artefacts_from_profile(smir_json_dir, Profile::Release(repo_dir))?;
+    }
+
+    Ok(())
+}
+
+enum Profile<'a> {
+    Dev(&'a Path),
+    Release(&'a Path),
+}
+
+impl Profile<'_> {
+    fn folder_as_string(&self) -> String {
+        match self {
+            Profile::Dev(_) => "debug/".into(),
+            Profile::Release(_) => "release/".into(),
+        }
+    }
+
+    fn profile_dir(&self) -> PathBuf {
+        match self {
+            Profile::Dev(repo_dir) => repo_dir.join("target/debug/"),
+            Profile::Release(repo_dir) => repo_dir.join("target/release/"),
+        }
+    }
+}
+
+fn cp_artefacts_from_profile(smir_json_dir: &Path, profile: Profile) -> Result<()> {
+    let rlib = profile.profile_dir().join("libstable_mir_json.rlib");
+    let bin = profile.profile_dir().join("stable_mir_json");
+
+    // Stable MIR JSON bin and rlib
+    let smir_json_profile_dir = smir_json_dir.join(profile.folder_as_string());
+    std::fs::create_dir(&smir_json_profile_dir)?;
+
+    let smir_json_profile_rlib = smir_json_profile_dir.join("libstable_mir_json.rlib");
+    println!(
+        "Copying {} to {}",
+        rlib.display(),
+        smir_json_profile_rlib.display()
+    );
+    std::fs::copy(rlib, smir_json_profile_rlib)?;
+
+    let smir_json_profile_bin = smir_json_profile_dir.join("stable_mir_json");
+    println!(
+        "Copying {} to {}",
+        bin.display(),
+        smir_json_profile_bin.display()
+    );
+    std::fs::copy(bin, smir_json_profile_bin)?;
+
+    Ok(())
+}
+
+fn add_run_script(smir_json_dir: &Path, ld_library_path: &Path) -> Result<()> {
+    let run_script_path = smir_json_dir.join("run.sh");
+    let mut run_script = std::fs::File::create(&run_script_path)?;
+    writeln!(run_script, "#!/bin/bash")?;
+    writeln!(run_script, "set -eu")?;
+    writeln!(run_script)?;
+    writeln!(
+        run_script,
+        "export LD_LIBRARY_PATH={}",
+        ld_library_path.display(),
+    )?;
+    writeln!(
+        run_script,
+        "exec \"{}/debug/stable_mir_json\" \"$@\"",
+        smir_json_dir.display()
+    )?;
+
+    // Set the script permissions to -rwxr-xr-x
+    std::fs::set_permissions(run_script_path, std::fs::Permissions::from_mode(0o755))?;
+    Ok(())
+}
+
+fn record_ld_library_path(smir_json_dir: &Path) -> Result<PathBuf> {
+    const LOADER_PATH: &str = "LD_LIBRARY_PATH";
+    if let Some(paths) = env::var_os(LOADER_PATH) {
+        // Note: kani filters the LD_LIBRARY_PATH, not sure why as it is working locally as is
+        let mut ld_library_file = std::fs::File::create(smir_json_dir.join("ld_library_path"))?;
+
+        match paths.to_str() {
+            Some(ld_library_path) => {
+                writeln!(ld_library_file, "{}", ld_library_path)?;
+                Ok(ld_library_path.into())
+            }
+            None => bail!("Couldn't cast LD_LIBRARY_PATH to str"),
+        }
+    } else {
+        bail!("Couldn't read LD_LIBRARY_PATH from env"); // This should be unreachable
+    }
+}

src/main.rs

@@ -4,7 +4,7 @@ pub mod driver;
 pub mod printer;
 use driver::stable_mir_driver;
 use printer::emit_smir;
-use stable_mir_pretty::mk_graph::emit_dotfile;
+use stable_mir_json::mk_graph::emit_dotfile;
 
 fn main() {
     let mut args: Vec<String> = env::args().collect();