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use crate::Word;
use super::{ Program, Address };
impl Program {
/* Intermediate code generation */
pub(crate) fn remove_definition_addresses(&mut self) {
for instr in &mut self.instructions {
for arg in &mut instr.args {
if let Address::Definitions(name) = arg {
*arg = self.definitions[name].clone();
}
}
}
self.definitions.clear();
}
pub(crate) fn collapse_instructions(&mut self) {
let mut collapsed = Vec::new();
let mut update_addrs = Vec::new();
for instr in &mut self.instructions {
update_addrs.push(collapsed.len());
collapsed.extend(instr.collapse());
}
for instr in &mut self.instructions {
for arg in &mut instr.args {
if let Address::Instruction(num) = arg {
*arg = Address::Instruction(update_addrs[*num]);
}
}
}
self.instructions = collapsed;
}
/* Machine code generation */
pub(crate) fn instructions_to_constants(&mut self, absolute_start: usize) {
let constlen = self.constants.len();
for instr in &mut self.instructions {
for arg in &mut instr.args {
self.constants.push(match arg {
Address::Memory(num) => *num,
Address::Constants(num) => absolute_start + *num,
Address::Instruction(num) => constlen + absolute_start + *num,
_ => unreachable!("Definition addresses should've already been removed!"),
} as Word);
}
}
self.instructions.clear();
}
pub(crate) fn to_bytes(self, absolute_start: usize) -> Vec<u8> {
let mut res = Vec::new();
res.resize(absolute_start, Default::default());
res.extend(self.constants);
res
.into_iter()
.map(|x| x.to_be_bytes())
.flatten()
.collect()
}
}
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