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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
use crate::common::{
opcode::Opcode,
data::Data,
number::build_number,
span::Span,
};
use std::fmt;
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Lambda {
pub code: Vec<u8>,
pub spans: Vec<(usize, Span)>,
pub constants: Vec<Data>,
pub captureds: Vec<usize>
}
impl Lambda {
pub fn empty() -> Lambda {
Lambda {
code: vec![],
spans: vec![],
constants: vec![],
captureds: vec![],
}
}
pub fn emit(&mut self, op: Opcode) {
self.code.push(op as u8)
}
pub fn emit_bytes(&mut self, bytes: &mut Vec<u8>) {
self.code.append(bytes)
}
pub fn emit_span(&mut self, span: &Span) {
self.spans.push((self.code.len(), span.clone()))
}
pub fn demit(&mut self) {
self.code.pop();
}
pub fn index_data(&mut self, data: Data) -> usize {
match self.constants.iter().position(|d| d == &data) {
Some(d) => d,
None => {
self.constants.push(data);
self.constants.len() - 1
},
}
}
pub fn index_span(&mut self, index: usize) -> Span {
let mut best = &Span::empty();
for (i, span) in self.spans.iter() {
if i > &index { break; }
best = span;
}
return best.clone();
}
}
impl fmt::Display for Lambda {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
writeln!(f, "\n-- Dumping Constants:")?;
for constant in self.constants.iter() {
writeln!(f, "{:?}", constant)?;
}
writeln!(f, "-- Dumping Captureds:")?;
for captured in self.captureds.iter() {
writeln!(f, "{:?}", captured)?;
}
writeln!(f, "-- Dumping Bytecode:")?;
writeln!(f, "Inst. \tArgs\tValue?")?;
let mut index = 0;
while index < self.code.len() {
index += 1;
match Opcode::from_byte(self.code[index - 1]) {
Opcode::Con => {
let (constant_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Load Con\t{}\t{:?}", constant_index, self.constants[constant_index])?;
},
Opcode::Del => { writeln!(f, "Delete \t\t--")?; },
Opcode::Capture => {
let (local_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Capture \t{}\tIndexed local moved to heap", local_index)?;
},
Opcode::Save => {
let (local_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Save \t{}\tIndexed local", local_index)?;
},
Opcode::SaveCap => {
let (upvalue_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Save Cap\t{}\tIndexed upvalue on heap", upvalue_index)?;
},
Opcode::Load => {
let (local_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Load \t{}\tIndexed local", local_index)?;
},
Opcode::LoadCap => {
let (upvalue_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Load Cap\t{}\tIndexed upvalue on heap", upvalue_index)?;
},
Opcode::Call => { writeln!(f, "Call \t\tRun top function using next stack value")?; }
Opcode::Return => {
let (num_locals, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Return \t{}\tLocals on stack deleted", num_locals)?;
},
Opcode::Closure => {
let (todo_index, consumed) = build_number(&self.code[index..]);
index += consumed;
writeln!(f, "Closure \t{}\tIndex of lambda to be wrapped", todo_index)?;
},
Opcode::Print => { writeln!(f, "Print \t\t--")?;}
}
}
Ok(())
}
}