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#![feature(path_add_extension)]
mod formats;
mod types;
mod stages;
pub use formats::*;
pub use types::*;
pub use stages::*;
use assembler::*;
use log::*;
use switchboard::*;
use std::io::Read;
use std::io::Write;
pub const RETURN_MODE: u8 = 0x80;
pub const WIDE_MODE: u8 = 0x40;
pub const IMMEDIATE_MODE: u8 = 0x20;
pub fn assemble(mut args: Switchboard, invocation: &str) {
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("no-truncate");
args.named("format").default("raw");
args.named("dry-run").short('n');
args.named("tree");
args.named("with-symbols");
args.named("help").short('h');
args.raise_errors();
if args.get("help").as_bool() {
print_help(invocation);
std::process::exit(0);
}
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 no_truncate = args.get("no-truncate").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 program = match generate_bytecode(&semantic) {
Ok(program) => program,
Err(errors) => {
report_bytecode_errors(&errors, &merged_source);
std::process::exit(1);
}
};
let AssembledProgram { mut bytecode, symbols } = program;
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 !no_truncate {
// Remove null bytes from end of bytecode.
while let Some(0) = bytecode.last() {
bytecode.pop();
}
let difference = length - bytecode.len();
if difference > 0 {
info!("Truncated program to {length} bytes (saved {difference} bytes)");
}
}
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::Raw => 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);
}
fn print_help(invocation: &str) {
eprintln!("\
Usage: {invocation} [source] [destination]
Convert Bedrock source code into an assembled Bedrock program.
Usage:
To assemble a Bedrock program from a source file and write to an output
file, run `br-asm [source] [destination]`, where [source] is the path
of the source file and [destination] is the path to write to.
If [destination] is omitted, the assembled program will be written to
standard output. If [source] is omitted, the program source code will
be read from standard input.
Environment variables:
BEDROCK_LIBS
A list of colon-separated paths which will be searched to find Bedrock
source code files to use as libraries when assembling a Bedrock program.
If a library file resolves an unresolved symbol in the program being
assembled, the library file will be merged into the program.
Arguments:
[source] Bedrock source code file to assemble.
[destination] Destination path for assembler output.
Switches:
--dry-run (-n) Assemble and show errors only, don't write any output
--extension=<ext> File extension to identify source files (default is 'brc')
--format=<fmt> Output format to use for assembled program (default is 'raw')
--no-project-libs Don't search for libraries in the source parent folder
--no-env-libs Don't search for libraries in the BEDROCK_LIBS path variable
--no-libs Combination of --no-project-libs and --no-env-libs
--no-truncate Don't remove trailing zero-bytes from the assembled program
--tree Show a tree diagram of all included library files
--with-symbols Also generate debug symbols file with extension '.sym'
--help (-h) Print this help information
--verbose, (-v) Print additional information
--version Print the program version and exit
");
}
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