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
|
/* Copyright 2018 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use super::{
BinaryReader, GlobalType, InitExpr, Range, Result, SectionIteratorLimited, SectionReader,
SectionWithLimitedItems,
};
#[derive(Debug, Copy, Clone)]
pub struct Global<'a> {
pub ty: GlobalType,
pub init_expr: InitExpr<'a>,
}
#[derive(Clone)]
pub struct GlobalSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> GlobalSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<GlobalSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(GlobalSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
/// Reads content of the global section.
///
/// # Examples
/// ```
/// use wasmparser::GlobalSectionReader;
/// # let data: &[u8] = &[0x01, 0x7F, 0x01, 0x41, 0x90, 0x88, 0x04, 0x0B];
/// let mut global_reader = GlobalSectionReader::new(data, 0).unwrap();
/// for _ in 0..global_reader.get_count() {
/// let global = global_reader.read().expect("global");
/// println!("Global: {:?}", global);
/// let mut init_expr_reader = global.init_expr.get_binary_reader();
/// let op = init_expr_reader.read_operator().expect("op");
/// println!("Init const: {:?}", op);
/// }
/// ```
pub fn read<'b>(&mut self) -> Result<Global<'b>>
where
'a: 'b,
{
let ty = self.reader.read_global_type()?;
let expr_offset = self.reader.position;
self.reader.skip_init_expr()?;
let data = &self.reader.buffer[expr_offset..self.reader.position];
let init_expr = InitExpr::new(data, self.reader.original_offset + expr_offset);
Ok(Global { ty, init_expr })
}
}
impl<'a> SectionReader for GlobalSectionReader<'a> {
type Item = Global<'a>;
fn read(&mut self) -> Result<Self::Item> {
GlobalSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
GlobalSectionReader::original_position(self)
}
fn range(&self) -> Range {
self.reader.range()
}
}
impl<'a> SectionWithLimitedItems for GlobalSectionReader<'a> {
fn get_count(&self) -> u32 {
GlobalSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for GlobalSectionReader<'a> {
type Item = Result<Global<'a>>;
type IntoIter = SectionIteratorLimited<GlobalSectionReader<'a>>;
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}
|
