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106 lines
3.7 KiB
106 lines
3.7 KiB
use std::collections::HashMap;
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use std::sync::atomic::AtomicU32;
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use crate::asm::data::{Rd, RdData};
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use crate::asm::data::literal::{Label, Value};
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use crate::asm::error::{AsmError, Error};
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use crate::asm::instr::{Cond, Instr, Op, Routine};
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use crate::builtin::defs::BuiltinOp;
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/// A trait for something that can turn into multiple instructions
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pub trait Flatten {
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fn flatten(self, label_num: &AtomicU32) -> Result<Vec<Op>, Error>;
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}
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impl Flatten for Instr {
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fn flatten(self, label_num: &AtomicU32) -> Result<Vec<Op>, Error> {
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let mut ops = vec![self.op];
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if let Some(branches) = self.branches {
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let labels = HashMap::<Cond, u32>::new();
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let branch_count = branches.len();
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let end_lbl = Label::unique(label_num);
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for (cnt, (cond, branch)) in branches.into_iter().enumerate() {
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if labels.contains_key(&cond) {
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return Err(Error::Asm(AsmError::ConditionalAlreadyUsed(cond)));
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}
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let next_lbl = if cnt == branch_count - 1 {
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end_lbl.clone()
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} else {
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Label::unique(label_num)
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};
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ops.push(BuiltinOp::JumpIf(!cond, next_lbl.clone()).into());
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for branch_instr in branch {
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ops.extend(branch_instr.flatten(label_num)?);
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}
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if cnt != branch_count - 1 {
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ops.push(BuiltinOp::Jump(end_lbl.clone()).into());
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ops.push(BuiltinOp::Label(next_lbl).into());
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}
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}
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ops.push(BuiltinOp::Label(end_lbl).into());
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}
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Ok(ops)
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}
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}
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impl Flatten for Routine {
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fn flatten(self, label_num: &AtomicU32) -> Result<Vec<Op>, Error> {
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let mut ops = vec![
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BuiltinOp::Routine(self.name.clone()).into(),
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];
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for instr in self.body {
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ops.extend(instr.flatten(label_num)?);
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}
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ops.push(BuiltinOp::Barrier(Some(format!("Routine \"{}\" overrun", self.name).into())).into());
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numbered_labels_to_skips(ops)
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}
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}
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/// Convert jumps to relative skips
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fn numbered_labels_to_skips(ops: Vec<Op>) -> Result<Vec<Op>, Error> {
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let mut label_positions = HashMap::<Label, usize>::new();
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for (n, op) in ops.iter().enumerate() {
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if let Op::BuiltIn(BuiltinOp::Label(name @ Label::Numbered(_))) = op {
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label_positions.insert(name.clone(), n - label_positions.len());
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}
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}
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let mut cleaned = vec![];
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let mut skipped = 0;
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for (n, op) in ops.into_iter().enumerate() {
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match op {
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Op::BuiltIn(BuiltinOp::Label(Label::Numbered(_))) => {
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skipped += 1;
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}
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Op::BuiltIn(BuiltinOp::Jump(target @ Label::Numbered(_))) => {
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if let Some(dest) = label_positions.get(&target) {
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let skip = *dest as isize - n as isize + skipped;
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cleaned.push(Op::BuiltIn(BuiltinOp::Skip(Rd::new(RdData::Immediate(skip as Value)))));
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} else {
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return Err(Error::Asm(AsmError::LabelNotDefined(target)));
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}
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}
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Op::BuiltIn(BuiltinOp::JumpIf(cond, target @ Label::Numbered(_))) => {
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if let Some(dest) = label_positions.get(&target) {
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let skip = *dest as isize - n as isize + skipped;
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cleaned.push(Op::BuiltIn(BuiltinOp::SkipIf(cond, Rd::new(RdData::Immediate(skip as Value)))));
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} else {
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return Err(Error::Asm(AsmError::LabelNotDefined(target)));
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}
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}
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other => {
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cleaned.push(other);
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}
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}
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}
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Ok(cleaned)
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}
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