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83 lines
2.6 KiB
83 lines
2.6 KiB
use std::cell::RefCell;
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use std::sync::Arc;
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use sexp::SourcePosition;
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use crate::asm::instr::flatten::jumps_to_skips;
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use crate::asm::parse::{ParserContext, ParserState};
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use crate::module::{CrsnExtension, CrsnUniq};
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use crate::runtime::program::Program;
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use crate::builtin::BuiltinOps;
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use crate::runtime::run_thread::{RunState, ThreadInfo, ThreadToken};
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use crate::runtime::frame::REG_COUNT;
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use std::sync::atomic::AtomicU32;
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pub mod data;
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pub mod error;
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pub mod instr;
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pub mod parse;
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pub mod patches;
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/// Parse a program from string and assemble a low level instruction sequence from it.
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pub fn assemble(source: &str, uniq : &CrsnUniq, mut parsers: Vec<Box<dyn CrsnExtension>>) -> Result<Arc<Program>, error::CrsnError> {
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parsers.insert(0, BuiltinOps::new());
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for p in &mut parsers {
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p.init(uniq);
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}
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let parsers_arc = Arc::new(parsers);
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// remove first line if it looks like a shebang
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let source = if source.starts_with("#!") {
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if let Some(nl) = source.find('\n') {
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&source[nl + 1..]
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} else {
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source
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}
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} else {
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source
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};
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let ti = Arc::new(ThreadInfo {
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id: ThreadToken(0),
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uniq: Default::default(),
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program: Program::new(vec![], parsers_arc.clone()).unwrap(),
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cycle_time: Default::default(),
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scheduler_interval: Default::default(),
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extensions: parsers_arc.clone(),
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});
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/* numbered labels start with a weird high number
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to avoid conflicts with user-defined numbered labels */
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let label_num = Arc::new(AtomicU32::new(0x7890_0000));
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let pcx = ParserContext {
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parsers: &parsers_arc,
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state: RefCell::new(ParserState {
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reg_aliases: Default::default(),
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reg_alias_stack: vec![],
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global_reg_aliases: Default::default(),
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constants: Default::default(),
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// This is a fake thread to pass to constant expressions when evaluating them.
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// This allows to evaluate nearly all instructions at compile time.
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const_eval: RunState {
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thread_info: ti.clone(),
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cr: Default::default(),
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parked: Default::default(),
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global_regs: [0; REG_COUNT],
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ext_data: Default::default(),
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cr_deadline: None,
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critical_section: 0,
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},
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const_eval_ti: ti,
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parsing_expr: false,
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label_num: label_num.clone()
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}),
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};
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let ops = parse::parse(source, &SourcePosition::default(), &pcx)?;
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let ops = jumps_to_skips(ops)?;
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Ok(Program::new(ops, parsers_arc)?)
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}
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