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elven-wald/Cargo.toml

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+[package]
+name = "elven-wald"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.69"
+clap = { version = "4.1.4", features = ["derive"] }
+elven-parser = { path = "../elven-parser" }
+memmap2 = "0.5.8"
+tracing = "0.1.37"
+tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }

elven-wald/src/lib.rs

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+#[macro_use]
+extern crate tracing;
+
+use anyhow::{bail, Context, Result};
+use clap::Parser;
+use elven_parser::defs::Elf;
+use memmap2::Mmap;
+use std::{fs::File, path::PathBuf};
+
+#[derive(Debug, Clone, Parser)]
+pub struct Opts {
+    pub objs: Vec<PathBuf>,
+}
+
+pub fn run(opts: Opts) -> Result<()> {
+    let mmaps = opts
+        .objs
+        .iter()
+        .map(|path| {
+            let file = File::open(path).with_context(|| format!("opening {}", path.display()))?;
+            unsafe {
+                Mmap::map(&file).with_context(|| format!("memory mapping {}", path.display()))
+            }
+        })
+        .collect::<Result<Vec<_>, anyhow::Error>>()?;
+
+    if opts.objs.len() == 0 {
+        bail!("you gotta supply at least one object file");
+    }
+
+    if opts.objs.len() > 1 {
+        bail!("hey hey hey one stop back please. you want to link MULTIPLE files TOGETHER? im sorry i cant do that");
+    }
+
+    info!(objs=?opts.objs, "Linking files");
+
+    let elfs = mmaps
+        .iter()
+        .zip(&opts.objs)
+        .map(|(mmap, path)| {
+            Elf::new(mmap).with_context(|| format!("parsing ELF file {}", path.display()))
+        })
+        .collect::<Result<Vec<_>, anyhow::Error>>()?;
+
+    let main_elf = elfs[0];
+
+    Ok(())
+}

elven-wald/src/main.rs

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+use clap::Parser;
+use tracing::metadata::LevelFilter;
+use tracing_subscriber::EnvFilter;
+
+fn main() -> anyhow::Result<()> {
+    let opts = elven_wald::Opts::parse();
+
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::builder()
+                .with_default_directive(LevelFilter::INFO.into())
+                .from_env_lossy(),
+        )
+        .init();
+
+    elven_wald::run(opts)
+}