[−][src]Struct wasmparser::Parser
The Parser
type. A simple event-driven parser of WebAssembly binary
format. The read(&mut self)
is used to iterate through WebAssembly records.
Methods
impl<'a> Parser<'a>
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pub fn new(data: &[u8]) -> Parser
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Constructs Parser
type.
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]; let mut parser = wasmparser::Parser::new(data);
pub fn eof(&self) -> bool
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pub fn current_position(&self) -> usize
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Trait Implementations
impl<'a> WasmDecoder<'a> for Parser<'a>
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fn read(&mut self) -> &ParserState<'a>
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Reads next record from the WebAssembly binary data. The methods returns
reference to current state of the parser. See ParserState
num.
Examples
use wasmparser::WasmDecoder; let mut parser = wasmparser::Parser::new(data); { let state = parser.read(); println!("First state {:?}", state); } { let state = parser.read(); println!("Second state {:?}", state); }
fn push_input(&mut self, input: ParserInput)
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fn create_binary_reader<'b>(&mut self) -> BinaryReader<'b> where
'a: 'b,
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'a: 'b,
Creates a BinaryReader when current state is ParserState::BeginSection or ParserState::BeginFunctionBody.
Examples
use wasmparser::{WasmDecoder, Parser, ParserState}; let mut parser = Parser::new(data); let mut types = Vec::new(); let mut function_types = Vec::new(); let mut function_readers = Vec::new(); loop { match parser.read() { ParserState::Error(_) | ParserState::EndWasm => break, ParserState::TypeSectionEntry(ty) => { types.push(ty.clone()); } ParserState::FunctionSectionEntry(id) => { function_types.push(id.clone()); } ParserState::BeginFunctionBody {..} => { let reader = parser.create_binary_reader(); function_readers.push(reader); } _ => continue } } for (i, reader) in function_readers.iter_mut().enumerate() { // Access the function type through the types table. let ty = &types[function_types[i] as usize]; println!("\nFunction {} of type {:?}", i, ty); // Read the local declarations required by the function body. let local_decls_len = reader.read_local_count().unwrap(); let mut local_decls = Vec::with_capacity(local_decls_len); let mut local_count = ty.params.len(); for _ in 0..local_decls_len { let local_decl = reader.read_local_decl(&mut local_count).unwrap(); local_decls.push(local_decl); } println!("Function locals: vars {:?}; total {} ", local_decls, local_count); // Read the operations of the function body. while let Ok(ref op) = reader.read_operator() { println!(" {:?}", op); } }
fn read_with_input(&mut self, input: ParserInput) -> &ParserState<'a>
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Reads next record from the WebAssembly binary data. It also allows to
control how parser will treat the next record(s). The method accepts the
ParserInput
parameter that allows e.g. to skip section or function
operators. The methods returns reference to current state of the parser.
Examples
use wasmparser::WasmDecoder; let mut parser = wasmparser::Parser::new(data); let mut next_input = wasmparser::ParserInput::Default; loop { let state = parser.read_with_input(next_input); match *state { wasmparser::ParserState::EndWasm => break, wasmparser::ParserState::BeginWasm { .. } | wasmparser::ParserState::EndSection => next_input = wasmparser::ParserInput::Default, wasmparser::ParserState::BeginSection { ref code, .. } => { println!("Found section: {:?}", code); next_input = wasmparser::ParserInput::SkipSection; }, _ => unreachable!() } }
fn last_state(&self) -> &ParserState<'a>
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Auto Trait Implementations
impl<'a> RefUnwindSafe for Parser<'a>
impl<'a> Send for Parser<'a>
impl<'a> Sync for Parser<'a>
impl<'a> Unpin for Parser<'a>
impl<'a> UnwindSafe for Parser<'a>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,