use crate::log::debug;
use crate::{conversion, ParseError, Result};
use alloc::{boxed::Box, format, vec::Vec};
use core::fmt::Debug;
use tinywasm_types::{Data, Element, Export, FuncType, Global, Import, Instruction, MemoryType, TableType, ValType};
use wasmparser::{Payload, Validator};
#[derive(Debug, Clone, PartialEq)]
pub struct CodeSection {
pub locals: Box<[ValType]>,
pub body: Box<[Instruction]>,
}
#[derive(Default)]
pub struct ModuleReader {
pub version: Option<u16>,
pub start_func: Option<u32>,
pub func_types: Vec<FuncType>,
// map from local function index to type index
pub code_type_addrs: Vec<u32>,
pub exports: Vec<Export>,
pub code: Vec<CodeSection>,
pub globals: Vec<Global>,
pub table_types: Vec<TableType>,
pub memory_types: Vec<MemoryType>,
pub imports: Vec<Import>,
pub data: Vec<Data>,
pub elements: Vec<Element>,
// pub element_section: Option<ElementSectionReader<'a>>,
pub end_reached: bool,
}
impl Debug for ModuleReader {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
f.debug_struct("ModuleReader")
.field("version", &self.version)
.field("func_types", &self.func_types)
.field("func_addrs", &self.code_type_addrs)
.field("code", &self.code)
.field("exports", &self.exports)
.field("globals", &self.globals)
.field("table_types", &self.table_types)
.field("memory_types", &self.memory_types)
.field("import_section", &self.imports)
// .field("element_section", &self.element_section)
// .field("data_section", &self.data_section)
.finish()
}
}
impl ModuleReader {
pub fn new() -> ModuleReader {
Self::default()
}
pub fn process_payload(&mut self, payload: Payload, validator: &mut Validator) -> Result<()> {
use wasmparser::Payload::*;
match payload {
Version { num, encoding, range } => {
validator.version(num, encoding, &range)?;
self.version = Some(num);
match encoding {
wasmparser::Encoding::Module => {}
wasmparser::Encoding::Component => return Err(ParseError::InvalidEncoding(encoding)),
}
}
StartSection { func, range } => {
if self.start_func.is_some() {
return Err(ParseError::DuplicateSection("Start section".into()));
}
debug!("Found start section");
validator.start_section(func, &range)?;
self.start_func = Some(func);
}
TypeSection(reader) => {
if !self.func_types.is_empty() {
return Err(ParseError::DuplicateSection("Type section".into()));
}
debug!("Found type section");
validator.type_section(&reader)?;
self.func_types = reader
.into_iter()
.map(|t| conversion::convert_module_type(t?))
.collect::<Result<Vec<FuncType>>>()?;
}
FunctionSection(reader) => {
if !self.code_type_addrs.is_empty() {
return Err(ParseError::DuplicateSection("Function section".into()));
}
debug!("Found function section");
validator.function_section(&reader)?;
self.code_type_addrs = reader.into_iter().map(|f| Ok(f?)).collect::<Result<Vec<_>>>()?;
}
GlobalSection(reader) => {
if !self.globals.is_empty() {
return Err(ParseError::DuplicateSection("Global section".into()));
}
debug!("Found global section");
validator.global_section(&reader)?;
self.globals = conversion::convert_module_globals(reader)?;
}
TableSection(reader) => {
if !self.table_types.is_empty() {
return Err(ParseError::DuplicateSection("Table section".into()));
}
debug!("Found table section");
validator.table_section(&reader)?;
self.table_types = conversion::convert_module_tables(reader)?;
}
MemorySection(reader) => {
if !self.memory_types.is_empty() {
return Err(ParseError::DuplicateSection("Memory section".into()));
}
debug!("Found memory section");
validator.memory_section(&reader)?;
self.memory_types = conversion::convert_module_memories(reader)?;
}
ElementSection(reader) => {
debug!("Found element section");
validator.element_section(&reader)?;
self.elements = conversion::convert_module_elements(reader)?;
}
DataSection(reader) => {
if !self.data.is_empty() {
return Err(ParseError::DuplicateSection("Data section".into()));
}
debug!("Found data section");
validator.data_section(&reader)?;
self.data = conversion::convert_module_data_sections(reader)?;
}
CodeSectionStart { count, range, .. } => {
debug!("Found code section ({} functions)", count);
if !self.code.is_empty() {
return Err(ParseError::DuplicateSection("Code section".into()));
}
validator.code_section_start(count, &range)?;
}
CodeSectionEntry(function) => {
debug!("Found code section entry");
let v = validator.code_section_entry(&function)?;
let func_validator = v.into_validator(Default::default());
self.code.push(conversion::convert_module_code(function, func_validator)?);
}
ImportSection(reader) => {
if !self.imports.is_empty() {
return Err(ParseError::DuplicateSection("Import section".into()));
}
debug!("Found import section");
validator.import_section(&reader)?;
self.imports = conversion::convert_module_imports(reader)?;
}
ExportSection(reader) => {
if !self.exports.is_empty() {
return Err(ParseError::DuplicateSection("Export section".into()));
}
debug!("Found export section");
validator.export_section(&reader)?;
self.exports =
reader.into_iter().map(|e| conversion::convert_module_export(e?)).collect::<Result<Vec<_>>>()?;
}
End(offset) => {
debug!("Reached end of module");
if self.end_reached {
return Err(ParseError::DuplicateSection("End section".into()));
}
validator.end(offset)?;
self.end_reached = true;
}
CustomSection(reader) => {
debug!("Found custom section");
debug!("Skipping custom section: {:?}", reader.name());
}
// TagSection(tag) => {
// debug!("Found tag section");
// validator.tag_section(&tag)?;
// }
UnknownSection { .. } => return Err(ParseError::UnsupportedSection("Unknown section".into())),
section => return Err(ParseError::UnsupportedSection(format!("Unsupported section: {:?}", section))),
};
Ok(())
}
}
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