llvm-bitcode 0.1.3

LLVM Bitcode parser in Rust
Documentation 
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

use std::fs;

use llvm_bitcode::bitcode::{BitcodeElement, Payload, Record};
use llvm_bitcode::{BitStreamVisitor, Bitcode};

#[test]
fn test_bitcode() {
    let data = fs::read("tests/fixtures/serialized.dia").unwrap();
    let _bitcode = Bitcode::new(&data).unwrap();

    let data = fs::read("tests/fixtures/simple.bc").unwrap();
    let bitcode = Bitcode::new(&data).unwrap();
    let module_block = bitcode
        .elements
        .iter()
        .find(|ele| match ele {
            BitcodeElement::Record(_) => false,
            BitcodeElement::Block(block) => block.id == 8,
        })
        .unwrap();
    let target_triple_record = module_block
        .as_block()
        .unwrap()
        .elements
        .iter()
        .find(|ele| match ele {
            BitcodeElement::Record(record) => record.id == 2,
            BitcodeElement::Block(_) => false,
        })
        .unwrap()
        .as_record()
        .unwrap();
    let fields: Vec<u8> = target_triple_record
        .fields
        .iter()
        .map(|x| *x as u8)
        .collect();
    let target_triple = std::str::from_utf8(&fields).unwrap();
    assert_eq!(target_triple, "x86_64-apple-macosx11.0.0");
}

#[test]
fn test_bitstream_reader() {
    struct LoggingVisitor(Vec<String>);

    impl BitStreamVisitor for LoggingVisitor {
        fn should_enter_block(&mut self, id: u64) -> bool {
            self.0.push(format!("entering block: {}", id));
            true
        }

        fn did_exit_block(&mut self) {
            self.0.push("exiting block".to_string());
        }

        fn visit(&mut self, record: Record) {
            let payload = if let Some(payload) = &record.payload {
                match payload {
                    Payload::Array(ele) => format!("array({} elements)", ele.len()),
                    Payload::Blob(blob) => format!("blob({} bytes)", blob.len()),
                    Payload::Char6String(s) => s.to_string(),
                }
            } else {
                "none".to_string()
            };
            self.0.push(format!(
                "Record (id: {}, fields: {:?}, payload: {}",
                record.id, record.fields, payload
            ));
        }
    }

    let data = fs::read("tests/fixtures/serialized.dia").unwrap();
    let mut visitor = LoggingVisitor(Vec::new());
    Bitcode::read(&data, &mut visitor).unwrap();
    assert_eq!(
        visitor.0,
        vec![
            "entering block: 8",
            "Record (id: 1, fields: [1], payload: none",
            "exiting block",
            "entering block: 9",
            "Record (id: 6, fields: [1, 0, 0, 100], payload: blob(100 bytes)",
            "Record (id: 2, fields: [3, 1, 53, 28, 0, 0, 0, 34], payload: blob(34 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 1, 53, 28, 0, 0, 0, 59], payload: blob(59 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 1, 113, 1, 0, 0, 0, 38], payload: blob(38 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 1, 113, 1, 0, 0, 0, 20], payload: blob(20 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 6, fields: [2, 0, 0, 98], payload: blob(98 bytes)",
            "Record (id: 2, fields: [3, 2, 21, 69, 0, 0, 0, 34], payload: blob(34 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 2, 21, 69, 0, 0, 0, 22], payload: blob(22 bytes)",
            "Record (id: 7, fields: [2, 21, 69, 0, 2, 21, 69, 0, 1], payload: blob(1 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 2, 21, 69, 0, 0, 0, 42], payload: blob(42 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 2, 21, 69, 0, 0, 0, 22], payload: blob(22 bytes)",
            "Record (id: 7, fields: [2, 21, 69, 0, 2, 21, 69, 0, 1], payload: blob(1 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 6, fields: [3, 0, 0, 84], payload: blob(84 bytes)",
            "Record (id: 2, fields: [3, 3, 38, 28, 0, 0, 0, 34], payload: blob(34 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 3, 38, 28, 0, 0, 0, 59], payload: blob(59 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 3, 66, 1, 0, 0, 0, 38], payload: blob(38 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 3, 66, 1, 0, 0, 0, 20], payload: blob(20 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 6, fields: [4, 0, 0, 93], payload: blob(93 bytes)",
            "Record (id: 2, fields: [3, 4, 15, 46, 0, 0, 0, 40], payload: blob(40 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 4, 15, 46, 0, 0, 0, 22], payload: blob(22 bytes)",
            "Record (id: 7, fields: [4, 15, 46, 0, 4, 15, 46, 0, 1], payload: blob(1 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 4, 15, 46, 0, 0, 0, 42], payload: blob(42 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 2, fields: [3, 4, 15, 46, 0, 0, 0, 22], payload: blob(22 bytes)",
            "Record (id: 7, fields: [4, 15, 46, 0, 4, 15, 46, 0, 1], payload: blob(1 bytes)",
            "exiting block",
            "entering block: 9",
            "Record (id: 6, fields: [5, 0, 0, 72], payload: blob(72 bytes)",
            "Record (id: 2, fields: [3, 5, 34, 13, 0, 0, 0, 44], payload: blob(44 bytes)",
            "Record (id: 3, fields: [5, 34, 13, 0, 5, 34, 26, 0], payload: none",
            "exiting block"
        ]
    )
}