blob: 92bf1d1e2b856f2a3cb53f310cf53560ca455018 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
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();
for instr in &mut self.instructions {
collapsed.extend(instr.collapse(collapsed.len()));
}
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 * 3,
_ => 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()
}
}
|
