diff --git a/hblang/Cargo.toml b/hblang/Cargo.toml
index 3cd9233..d2d7742 100644
--- a/hblang/Cargo.toml
+++ b/hblang/Cargo.toml
@@ -3,6 +3,10 @@ name = "hblang"
 version = "0.1.0"
 edition = "2021"
 
+[[bin]]
+name = "hbc"
+path = "src/main.rs"
+
 [dependencies]
 
 [dev-dependencies]
diff --git a/hblang/src/codegen.rs b/hblang/src/codegen.rs
index 435f880..854ce97 100644
--- a/hblang/src/codegen.rs
+++ b/hblang/src/codegen.rs
@@ -307,8 +307,9 @@ impl<'a> std::fmt::Display for TypeDisplay<'a> {
     }
 }
 
+#[derive(Default)]
 pub struct Codegen<'a> {
-    path:       &'a std::path::Path,
+    path:       &'a str,
     input:      &'a [u8],
     ret:        Type,
     gpa:        RegAlloc,
@@ -325,31 +326,7 @@ pub struct Codegen<'a> {
 }
 
 impl<'a> Codegen<'a> {
-    pub fn new() -> Self {
-        Self {
-            path:       std::path::Path::new(""),
-            input:      &[],
-            ret:        bt::VOID,
-            gpa:        Default::default(),
-            code:       Default::default(),
-            temp:       Default::default(),
-            labels:     Default::default(),
-            stack_size: 0,
-            vars:       Default::default(),
-            ret_relocs: Default::default(),
-            loops:      Default::default(),
-            records:    Default::default(),
-            pointers:   Default::default(),
-            main:       None,
-        }
-    }
-
-    pub fn file(
-        &mut self,
-        path: &'a std::path::Path,
-        input: &'a [u8],
-        exprs: &'a [parser::Expr<'a>],
-    ) -> std::fmt::Result {
+    pub fn file(&mut self, path: &'a str, input: &'a [u8], exprs: &'a [parser::Expr<'a>]) {
         self.path = path;
         self.input = input;
 
@@ -442,7 +419,6 @@ impl<'a> Codegen<'a> {
                 _ => unreachable!(),
             }
         }
-        Ok(())
     }
 
     fn align_of(&self, ty: Type) -> u64 {
@@ -1168,7 +1144,7 @@ impl<'a> Codegen<'a> {
 
     fn report(&self, pos: parser::Pos, msg: impl std::fmt::Display) -> ! {
         let (line, col) = lexer::line_col(self.input, pos);
-        println!("{}:{}:{}: {}", self.path.display(), line, col, msg);
+        println!("{}:{}:{}: {}", self.path, line, col, msg);
         unreachable!();
     }
 }
@@ -1276,12 +1252,12 @@ mod tests {
     }
 
     fn generate(input: &'static str, output: &mut String) {
-        let path = std::path::Path::new("test");
+        let path = "test";
         let arena = crate::parser::Arena::default();
         let mut parser = super::parser::Parser::new(input, path, &arena);
         let exprs = parser.file();
-        let mut codegen = super::Codegen::new();
-        codegen.file(path, input.as_bytes(), &exprs).unwrap();
+        let mut codegen = super::Codegen::default();
+        codegen.file(path, input.as_bytes(), &exprs);
         let mut out = Vec::new();
         codegen.dump(&mut out).unwrap();
 
diff --git a/hblang/src/lib.rs b/hblang/src/lib.rs
index 909fd2c..f41aa95 100644
--- a/hblang/src/lib.rs
+++ b/hblang/src/lib.rs
@@ -15,12 +15,12 @@ macro_rules! run_tests {
     )*};
 }
 
-mod codegen;
+pub mod codegen;
 mod ident;
 mod instrs;
 mod lexer;
 mod log;
-mod parser;
+pub mod parser;
 mod tests;
 mod typechk;
 
diff --git a/hblang/src/main.rs b/hblang/src/main.rs
new file mode 100644
index 0000000..2e9fd70
--- /dev/null
+++ b/hblang/src/main.rs
@@ -0,0 +1,25 @@
+use std::io;
+
+use hblang::{codegen, parser};
+
+fn main() -> io::Result<()> {
+    if std::env::args().len() == 1 {
+        eprintln!("Usage: hblang <file1> <file2> ...");
+        eprintln!(" 1. compiled binary will be printed to stdout");
+        eprintln!(" 2. order of files matters");
+        std::process::exit(1);
+    }
+
+    let files = std::env::args()
+        .skip(1)
+        .map(|path| std::fs::read_to_string(&path).map(|src| (path, src)))
+        .collect::<io::Result<Vec<_>>>()?;
+    let mut arena = parser::Arena::default();
+    let mut codegen = codegen::Codegen::default();
+    for (path, content) in files.iter() {
+        let file = parser::Parser::new(content, path, &arena).file();
+        codegen.file(path, content.as_bytes(), file);
+        arena.clear();
+    }
+    codegen.dump(&mut std::io::stdout())
+}
diff --git a/hblang/src/parser.rs b/hblang/src/parser.rs
index ce51d95..a12b11c 100644
--- a/hblang/src/parser.rs
+++ b/hblang/src/parser.rs
@@ -15,7 +15,7 @@ struct ScopeIdent<'a> {
 }
 
 pub struct Parser<'a, 'b> {
-    path:   &'a std::path::Path,
+    path:   &'a str,
     lexer:  Lexer<'a>,
     arena:  &'b Arena<'a>,
     token:  Token,
@@ -23,7 +23,7 @@ pub struct Parser<'a, 'b> {
 }
 
 impl<'a, 'b> Parser<'a, 'b> {
-    pub fn new(input: &'a str, path: &'a std::path::Path, arena: &'b Arena<'a>) -> Self {
+    pub fn new(input: &'a str, path: &'a str, arena: &'b Arena<'a>) -> Self {
         let mut lexer = Lexer::new(input);
         let token = lexer.next();
         Self {
@@ -43,7 +43,7 @@ impl<'a, 'b> Parser<'a, 'b> {
             let (line, col) = self.lexer.line_col(ident::pos(id.ident));
             eprintln!(
                 "{}:{}:{} => undeclared identifier: {}",
-                self.path.display(),
+                self.path,
                 line,
                 col,
                 self.lexer.slice(ident::range(id.ident))
@@ -327,7 +327,7 @@ impl<'a, 'b> Parser<'a, 'b> {
 
     fn report(&self, msg: impl std::fmt::Display) -> ! {
         let (line, col) = self.lexer.line_col(self.token.start);
-        eprintln!("{}:{}:{} => {}", self.path.display(), line, col, msg);
+        eprintln!("{}:{}:{} => {}", self.path, line, col, msg);
         unreachable!();
     }
 }
@@ -717,7 +717,7 @@ mod tests {
     fn parse(input: &'static str, output: &mut String) {
         use std::fmt::Write;
         let mut arena = super::Arena::default();
-        let mut parser = super::Parser::new(input, std::path::Path::new("test"), &arena);
+        let mut parser = super::Parser::new(input, "test", &arena);
         for expr in parser.file() {
             writeln!(output, "{}", expr).unwrap();
         }