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/* 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, BinaryReaderError, Result, SectionIteratorLimited, SectionReader,
SectionWithLimitedItems,
};
#[derive(Debug)]
pub struct FunctionBody<'a> {
offset: usize,
data: &'a [u8],
}
impl<'a> FunctionBody<'a> {
pub fn get_binary_reader<'b>(&self) -> BinaryReader<'b>
where
'a: 'b,
{
BinaryReader::new_with_offset(self.data, self.offset)
}
}
pub struct CodeSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> CodeSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<CodeSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(CodeSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
fn verify_body_end(&self, end: usize) -> Result<()> {
if self.reader.buffer.len() < end {
return Err(BinaryReaderError {
message: "Function body extends past end of the code section",
offset: self.reader.original_offset + self.reader.buffer.len(),
});
}
Ok(())
}
/// Reads content of the code section.
///
/// # Examples
/// ```
/// # let data: &[u8] = &[0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
/// # 0x01, 0x4, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00,
/// # 0x0a, 0x05, 0x01, 0x03, 0x00, 0x01, 0x0b];
/// use wasmparser::ModuleReader;
/// let mut reader = ModuleReader::new(data).expect("module reader");
/// let section = reader.read().expect("type section");
/// let section = reader.read().expect("function section");
/// let section = reader.read().expect("code section");
/// let mut code_reader = section.get_code_section_reader().expect("code section reader");
/// for _ in 0..code_reader.get_count() {
/// let body = code_reader.read().expect("function body");
/// let mut binary_reader = body.get_binary_reader();
/// assert!(binary_reader.read_local_count().expect("local count") == 0);
/// let op = binary_reader.read_operator().expect("first operator");
/// println!("First operator: {:?}", op);
/// }
/// ```
pub fn read<'b>(&mut self) -> Result<FunctionBody<'b>>
where
'a: 'b,
{
let size = self.reader.read_var_u32()? as usize;
let body_start = self.reader.position;
let body_end = body_start + size;
self.verify_body_end(body_end)?;
self.reader.skip_to(body_end);
Ok(FunctionBody {
offset: self.reader.original_offset + body_start,
data: &self.reader.buffer[body_start..body_end],
})
}
}
impl<'a> SectionReader for CodeSectionReader<'a> {
type Item = FunctionBody<'a>;
fn read(&mut self) -> Result<Self::Item> {
CodeSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
CodeSectionReader::original_position(self)
}
}
impl<'a> SectionWithLimitedItems for CodeSectionReader<'a> {
fn get_count(&self) -> u32 {
CodeSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for CodeSectionReader<'a> {
type Item = Result<FunctionBody<'a>>;
type IntoIter = SectionIteratorLimited<CodeSectionReader<'a>>;
/// Implements iterator over the code section.
///
/// # Examples
/// ```
/// # let data: &[u8] = &[0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
/// # 0x01, 0x4, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00,
/// # 0x0a, 0x05, 0x01, 0x03, 0x00, 0x01, 0x0b];
/// use wasmparser::ModuleReader;
/// let mut reader = ModuleReader::new(data).expect("module reader");
/// let section = reader.read().expect("type section");
/// let section = reader.read().expect("function section");
/// let section = reader.read().expect("code section");
/// let mut code_reader = section.get_code_section_reader().expect("code section reader");
/// for body in code_reader {
/// let mut binary_reader = body.expect("b").get_binary_reader();
/// assert!(binary_reader.read_local_count().expect("local count") == 0);
/// let op = binary_reader.read_operator().expect("first operator");
/// println!("First operator: {:?}", op);
/// }
/// ```
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}