1 files changed, 152 insertions, 0 deletions
diff --git a/src/bin/br/asm.rs b/src/bin/br/asm.rs
new file mode 100644
index 0000000..f4620cf
--- /dev/null
+++ b/src/bin/br/asm.rs
@@ -0,0 +1,152 @@
+use crate::formats::*;
+
+use bedrock_asm::*;
+use log::{info, fatal};
+use switchboard::*;
+
+use std::io::{Read, Write};
+use std::path::Path;
+
+
+pub fn main(mut args: Switchboard) {
+    args.positional("source");
+    args.positional("destination");
+    args.named("extension").default("brc");
+
+    args.named("no-libs");
+    args.named("no-project-libs");
+    args.named("no-env-libs");
+
+    args.named("format").default("binary");
+    args.named("dry-run").short('n');
+    args.named("tree");
+    args.named("with-symbols");
+    args.raise_errors();
+
+    let source_path        = args.get("source").as_path_opt().map(
+        |p| p.canonicalize().unwrap_or_else(|e| fatal!("{p:?}: {e:?}")));
+    let destination_path   = args.get("destination").as_path_opt();
+    let extension          = args.get("extension").as_string();
+    let opt_extension      = Some(extension.as_str());
+
+    let no_libs            = args.get("no-libs").as_bool();
+    let no_project_libs    = args.get("no-project-libs").as_bool();
+    let no_env_libs        = args.get("no-env-libs").as_bool();
+
+    let format             = Format::from_str(args.get("format").as_str());
+    let dry_run            = args.get("dry-run").as_bool();
+    let print_tree         = args.get("tree").as_bool();
+    let export_symbols     = args.get("with-symbols").as_bool();
+
+    // -----------------------------------------------------------------------
+
+    let mut compiler = new_compiler();
+
+    if let Some(path) = &source_path {
+        info!("Reading program source from {path:?}");
+        compiler.root_from_path(path).unwrap_or_else(|err| fatal!("{err:?}: {path:?}"));
+    } else {
+        let mut source_code = String::new();
+        info!("Reading program source from standard input");
+        if let Err(err) = std::io::stdin().read_to_string(&mut source_code) {
+            fatal!("Could not read from standard input\n{err:?}");
+        }
+        compiler.root_from_string(source_code, "<standard input>")
+    };
+    if compiler.error().is_some() && !no_libs && !no_project_libs {
+        compiler.include_libs_from_parent(opt_extension);
+    }
+    if compiler.error().is_some() && !no_libs && !no_env_libs {
+        compiler.include_libs_from_path_variable("BEDROCK_LIBS", opt_extension);
+    }
+
+    if print_tree {
+        compiler.hierarchy().report()
+    }
+    if let Some(error) = compiler.error() {
+        error.report();
+        std::process::exit(1);
+    }
+
+    let merged_source = compiler.get_compiled_source().unwrap_or_else(|error| {
+        error.report();
+        std::process::exit(1);
+    });
+
+    if !dry_run && format == Format::Source {
+        write_bytes_and_exit(merged_source.as_bytes(), destination_path.as_ref());
+    }
+
+    // -----------------------------------------------------------------------
+
+    let path = Some("<merged source>");
+    let syntactic = match parse_syntactic(&merged_source, path) {
+        Ok(tokens) => tokens,
+        Err(errors) => {
+            report_syntactic_errors(&errors, &merged_source);
+            std::process::exit(1);
+        }
+    };
+
+    let semantic = match parse_semantic(syntactic) {
+        Ok(tokens) => tokens,
+        Err(errors) => {
+            report_semantic_errors(&errors, &merged_source);
+            std::process::exit(1);
+        }
+    };
+
+    let AssembledProgram { mut bytecode, symbols } = generate_bytecode(&semantic);
+    // Remove null bytes from end of bytecode.
+    while let Some(0) = bytecode.last() {
+        bytecode.pop();
+    }
+
+    let length = bytecode.len();
+    let percentage = (length as f32 / 65536.0 * 100.0).round() as u16;
+    info!("Assembled program in {length} bytes ({percentage}% of maximum)");
+
+    if !dry_run {
+        if export_symbols {
+            if let Some(path) = &destination_path {
+                let mut symbols_path = path.to_path_buf();
+                symbols_path.add_extension("sym");
+                let mut symbols_string = String::new();
+                for symbol in &symbols {
+                    let address = &symbol.address;
+                    let name = &symbol.name;
+                    let location = &symbol.source.location();
+                    symbols_string.push_str(&format!(
+                        "{address:04x} {name} {location}\n"
+                    ));
+                }
+                match std::fs::write(&symbols_path, symbols_string) {
+                    Ok(_) => info!("Saved symbols to {symbols_path:?}"),
+                    Err(err) => info!("Could not write symbols to {symbols_path:?}\n{err:?}"),
+                }
+            }
+        }
+
+        let bytes = match format {
+            Format::Binary => bytecode,
+            Format::Clang => format_clang(&bytecode),
+            Format::Source => unreachable!("Source output is handled before full assembly"),
+        };
+        write_bytes_and_exit(&bytes, destination_path.as_ref());
+    }
+}
+
+
+fn write_bytes_and_exit<P: AsRef<Path>>(bytes: &[u8], path: Option<&P>) -> ! {
+    match path {
+        Some(path) => match std::fs::write(path, bytes) {
+            Ok(_) => info!("Wrote output to {:?}", path.as_ref()),
+            Err(err) => fatal!("Could not write to {:?}\n{err:?}", path.as_ref()),
+        }
+        None => match std::io::stdout().write_all(bytes) {
+            Ok(_) => info!("Wrote output to standard output"),
+            Err(err) => fatal!("Could not write to standard output\n{err:?}"),
+        }
+    }
+    std::process::exit(0);
+}