rjvm 0.3.0

Parse JVM class files with 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
146
147
148
149
150
151
152
153

use crate::bytecode::pool::{ConstantPool, ConstantPoolEntry, ConstantPoolIndex, ConstantTag};
use crate::bytecode::reader::BufferedReader;
use crate::bytecode::BytecodeError;

pub fn read_constant_pool_entry(
    reader: &mut BufferedReader,
    _cp: &mut ConstantPool,
) -> Result<ConstantPoolEntry, BytecodeError> {
    let tag = reader.take::<u8>()?;
    let Some(tag) = ConstantTag::from_tag(tag) else {
        return Err(BytecodeError::InvalidData);
    };

    let entry = match tag {
        ConstantTag::Class => {
            let name_index = reader.take::<u16>()?;

            ConstantPoolEntry::Class {
                name_index: ConstantPoolIndex::new(name_index),
            }
        }
        ConstantTag::FieldRef => {
            let class_index = reader.take::<u16>()?;
            let name_and_type_index = reader.take::<u16>()?;

            ConstantPoolEntry::FieldRef {
                class_index: ConstantPoolIndex::new(class_index),
                name_and_type_index: ConstantPoolIndex::new(name_and_type_index),
            }
        }
        ConstantTag::MethodRef => {
            let class_index = reader.take::<u16>()?;
            let name_and_type_index = reader.take::<u16>()?;

            ConstantPoolEntry::MethodRef {
                class_index: ConstantPoolIndex::new(class_index),
                name_and_type_index: ConstantPoolIndex::new(name_and_type_index),
            }
        }
        ConstantTag::InterfaceMethodRef => {
            let class_index = reader.take::<u16>()?;
            let name_and_type_index = reader.take::<u16>()?;

            ConstantPoolEntry::InterfaceMethodRef {
                class_index: ConstantPoolIndex::new(class_index),
                name_and_type_index: ConstantPoolIndex::new(name_and_type_index),
            }
        }
        ConstantTag::String => {
            let string_index = reader.take::<u16>()?;

            ConstantPoolEntry::String {
                string_index: ConstantPoolIndex::new(string_index),
            }
        }
        ConstantTag::Integer => {
            let bytes = reader.take::<i32>()?;

            ConstantPoolEntry::Integer { bytes }
        }
        ConstantTag::Float => {
            let bytes = reader.take::<f32>().expect("msg");

            ConstantPoolEntry::Float { bytes }
        }
        ConstantTag::Long => {
            let high_bytes = reader.take::<u32>()?;
            let low_bytes = reader.take::<u32>()?;

            ConstantPoolEntry::Long {
                high_bytes,
                low_bytes,
            }
        }
        ConstantTag::Double => {
            let high_bytes = reader.take::<u32>()?;
            let low_bytes = reader.take::<u32>()?;

            ConstantPoolEntry::Double {
                high_bytes,
                low_bytes,
            }
        }
        ConstantTag::NameAndType => {
            let name_index = reader.take::<u16>()?;
            let descriptor_index = reader.take::<u16>()?;

            ConstantPoolEntry::NameAndType {
                name_index: ConstantPoolIndex::new(name_index),
                descriptor_index: ConstantPoolIndex::new(descriptor_index),
            }
        }
        ConstantTag::Utf8 => {
            let length = reader.take::<u16>()?;
            let bytes = reader.take_bytes(length as usize)?;

            ConstantPoolEntry::Utf8 {
                length,
                bytes: bytes.to_vec(),
            }
        }
        ConstantTag::MethodHandle => {
            let reference_kind = reader.take::<u8>()?;
            let reference_index = reader.take::<u16>()?;

            ConstantPoolEntry::MethodHandle {
                reference_kind,
                reference_index: ConstantPoolIndex::new(reference_index),
            }
        }
        ConstantTag::MethodType => {
            let descriptor_index = reader.take::<u16>()?;

            ConstantPoolEntry::MethodType {
                descriptor_index: ConstantPoolIndex::new(descriptor_index),
            }
        }
        ConstantTag::Dynamic => {
            let bootstrap_method_attr_index = reader.take::<u16>()?;
            let name_and_type_index = reader.take::<u16>()?;

            ConstantPoolEntry::Dynamic {
                bootstrap_method_attr_index: ConstantPoolIndex::new(bootstrap_method_attr_index),
                name_and_type_index: ConstantPoolIndex::new(name_and_type_index),
            }
        }
        ConstantTag::InvokeDynamic => {
            let bootstrap_method_attr_index = reader.take::<u16>()?;
            let name_and_type_index = reader.take::<u16>()?;

            ConstantPoolEntry::InvokeDynamic {
                bootstrap_method_attr_index: ConstantPoolIndex::new(bootstrap_method_attr_index),
                name_and_type_index: ConstantPoolIndex::new(name_and_type_index),
            }
        }
        ConstantTag::Module => {
            let name_index = reader.take::<u16>()?;

            ConstantPoolEntry::Module {
                name_index: ConstantPoolIndex::new(name_index),
            }
        }
        ConstantTag::Package => {
            let name_index = reader.take::<u16>()?;

            ConstantPoolEntry::Package {
                name_index: ConstantPoolIndex::new(name_index),
            }
        }
    };

    Ok(entry)
}