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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(())
+}