use crate::log::debug;
use crate::{ParseError, ParserOptions, Result, conversion, optimize};
use alloc::{format, string::ToString, vec::Vec};
use tinywasm_types::*;
use wasmparser::{FuncValidatorAllocations, Payload, Validator};
pub(crate) type Code = (Vec<Instruction>, WasmFunctionData, ValueCounts);
#[derive(Default)]
pub(crate) struct ModuleReader {
func_validator_allocations: Option<FuncValidatorAllocations>,
pub(crate) version: Option<u16>,
pub(crate) start_func: Option<u32>,
pub(crate) func_types: Vec<FuncType>,
pub(crate) code_type_addrs: Vec<u32>,
pub(crate) exports: Vec<Export>,
pub(crate) code: Vec<Code>,
pub(crate) globals: Vec<Global>,
pub(crate) table_types: Vec<TableType>,
pub(crate) memory_types: Vec<MemoryType>,
pub(crate) imports: Vec<Import>,
pub(crate) data: Vec<Data>,
pub(crate) elements: Vec<Element>,
pub(crate) end_reached: bool,
}
impl ModuleReader {
pub(crate) fn process_payload(&mut self, payload: Payload<'_>, validator: &mut Validator) -> Result<()> {
match payload {
Payload::Version { num, encoding, range } => {
validator.version(num, encoding, &range)?;
self.version = Some(num);
if let wasmparser::Encoding::Component = encoding {
return Err(ParseError::InvalidEncoding(encoding));
}
}
Payload::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);
}
Payload::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>>>()?;
}
Payload::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)?;
}
Payload::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)?;
}
Payload::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)?;
}
Payload::ElementSection(reader) => {
debug!("Found element section");
validator.element_section(&reader)?;
self.elements = conversion::convert_module_elements(reader)?;
}
Payload::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)?;
}
Payload::DataCountSection { count, range } => {
debug!("Found data count section");
if !self.data.is_empty() {
return Err(ParseError::DuplicateSection("Data count section".into()));
}
validator.data_count_section(count, &range)?;
}
Payload::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<_>>>()?;
}
Payload::CodeSectionStart { count, range, .. } => {
debug!("Found code section ({count} functions)");
if !self.code.is_empty() {
return Err(ParseError::DuplicateSection("Code section".into()));
}
self.code.reserve(count as usize);
validator.code_section_start(&range)?;
}
Payload::CodeSectionEntry(function) => {
debug!("Found code section entry");
let v = validator.code_section_entry(&function)?;
let func_validator = v.into_validator(self.func_validator_allocations.take().unwrap_or_default());
let (code, allocations) = conversion::convert_module_code(function, func_validator)?;
self.code.push(code);
self.func_validator_allocations = Some(allocations);
}
Payload::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.into_imports())?;
}
Payload::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<_>>>()?;
}
Payload::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;
}
Payload::CustomSection(_reader) => {
debug!("Found custom section");
debug!("Skipping custom section: {:?}", _reader.name());
}
Payload::UnknownSection { .. } => return Err(ParseError::UnsupportedSection("Unknown section".into())),
section => return Err(ParseError::UnsupportedSection(format!("Unsupported section: {section:?}"))),
};
Ok(())
}
pub(crate) fn into_module(self, options: &ParserOptions) -> Result<TinyWasmModule> {
if !self.end_reached {
return Err(ParseError::EndNotReached);
}
if self.code_type_addrs.len() != self.code.len() {
return Err(ParseError::Other("Code and code type address count mismatch".to_string()));
}
let Self {
start_func,
func_types,
code_type_addrs,
exports,
code,
globals,
table_types,
memory_types,
imports,
data,
elements,
..
} = self;
let imported_func_count = imports.iter().filter(|i| matches!(&i.kind, ImportKind::Function(_))).count();
let imported_memory_count = imports.iter().filter(|i| matches!(&i.kind, ImportKind::Memory(_))).count() as u32;
let has_local_memory_export =
exports.iter().any(|export| export.kind == ExternalKind::Memory && export.index >= imported_memory_count);
let has_active_data_segment_on_local_memory = data.iter().any(|data| match &data.kind {
DataKind::Active { mem, .. } => *mem >= imported_memory_count,
DataKind::Passive => false,
});
let optimize_local_memory_allocation = options.optimize_local_memory_allocation();
let mut local_memory_allocation = if memory_types.is_empty() {
LocalMemoryAllocation::Skip
} else if !optimize_local_memory_allocation || has_active_data_segment_on_local_memory {
LocalMemoryAllocation::Eager
} else if has_local_memory_export {
LocalMemoryAllocation::Lazy
} else {
LocalMemoryAllocation::Skip
};
let mut funcs = Vec::with_capacity(code.len());
for (func_idx, ((instructions, mut data, locals), ty_idx)) in code.into_iter().zip(code_type_addrs).enumerate()
{
let ty = func_types.get(ty_idx as usize).expect("No func type for func, this is a bug").clone();
let params = ValueCounts::from_iter(ty.params());
let self_func = (imported_func_count + func_idx) as u32;
let optimized = optimize::optimize_instructions(
instructions,
&mut data,
self_func,
imported_memory_count,
optimize_local_memory_allocation && local_memory_allocation != LocalMemoryAllocation::Eager,
);
if optimized.uses_local_memory {
local_memory_allocation = LocalMemoryAllocation::Eager;
}
funcs.push(WasmFunction { instructions: ArcSlice::from(optimized.instructions), data, locals, params, ty });
}
Ok(TinyWasmModule {
funcs: funcs.into(),
func_types: func_types.into(),
globals: globals.into(),
table_types: table_types.into(),
imports: imports.into(),
start_func,
data: data.into(),
exports: exports.into(),
elements: elements.into(),
memory_types: memory_types.into(),
local_memory_allocation,
})
}
}
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