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|
use super::*;
use std::convert::TryFrom;
impl Module {
/// Encode this Wasm module into bytes.
pub fn to_bytes(&self) -> Vec<u8> {
self.encoded().finish()
}
fn encoded(&self) -> wasm_encoder::Module {
let mut module = wasm_encoder::Module::new();
self.encode_types(&mut module);
self.encode_imports(&mut module);
self.encode_funcs(&mut module);
self.encode_tables(&mut module);
self.encode_memories(&mut module);
self.encode_tags(&mut module);
self.encode_globals(&mut module);
self.encode_exports(&mut module);
self.encode_start(&mut module);
self.encode_elems(&mut module);
self.encode_data_count(&mut module);
self.encode_code(&mut module);
self.encode_data(&mut module);
module
}
fn encode_types(&self, module: &mut wasm_encoder::Module) {
if !self.should_encode_types {
return;
}
let mut section = wasm_encoder::TypeSection::new();
for ty in &self.types {
match ty {
Type::Func(ty) => {
section.function(ty.params.iter().cloned(), ty.results.iter().cloned());
}
}
}
module.section(§ion);
}
fn encode_imports(&self, module: &mut wasm_encoder::Module) {
if !self.should_encode_imports {
return;
}
let mut section = wasm_encoder::ImportSection::new();
for im in &self.imports {
section.import(
&im.module,
&im.field,
translate_entity_type(&im.entity_type),
);
}
module.section(§ion);
}
fn encode_tags(&self, module: &mut wasm_encoder::Module) {
if self.num_defined_tags == 0 {
return;
}
let mut tags = wasm_encoder::TagSection::new();
for tag in self.tags[self.tags.len() - self.num_defined_tags..].iter() {
tags.tag(wasm_encoder::TagType {
kind: wasm_encoder::TagKind::Exception,
func_type_idx: tag.func_type_idx,
});
}
module.section(&tags);
}
fn encode_funcs(&self, module: &mut wasm_encoder::Module) {
if self.num_defined_funcs == 0 {
return;
}
let mut funcs = wasm_encoder::FunctionSection::new();
for (ty, _) in self.funcs[self.funcs.len() - self.num_defined_funcs..].iter() {
funcs.function(*ty);
}
module.section(&funcs);
}
fn encode_tables(&self, module: &mut wasm_encoder::Module) {
if self.num_defined_tables == 0 {
return;
}
let mut tables = wasm_encoder::TableSection::new();
for t in self.tables[self.tables.len() - self.num_defined_tables..].iter() {
tables.table(*t);
}
module.section(&tables);
}
fn encode_memories(&self, module: &mut wasm_encoder::Module) {
if self.num_defined_memories == 0 {
return;
}
let mut mems = wasm_encoder::MemorySection::new();
for m in self.memories[self.memories.len() - self.num_defined_memories..].iter() {
mems.memory(*m);
}
module.section(&mems);
}
fn encode_globals(&self, module: &mut wasm_encoder::Module) {
if self.globals.is_empty() {
return;
}
let mut globals = wasm_encoder::GlobalSection::new();
for (idx, expr) in &self.defined_globals {
let ty = &self.globals[*idx as usize];
match expr {
GlobalInitExpr::ConstExpr(expr) => globals.global(*ty, expr),
GlobalInitExpr::FuncRef(func) => globals.global(*ty, &ConstExpr::ref_func(*func)),
};
}
module.section(&globals);
}
fn encode_exports(&self, module: &mut wasm_encoder::Module) {
if self.exports.is_empty() {
return;
}
let mut exports = wasm_encoder::ExportSection::new();
for (name, kind, idx) in &self.exports {
exports.export(name, *kind, *idx);
}
module.section(&exports);
}
fn encode_start(&self, module: &mut wasm_encoder::Module) {
if let Some(f) = self.start {
module.section(&wasm_encoder::StartSection { function_index: f });
}
}
fn encode_elems(&self, module: &mut wasm_encoder::Module) {
if self.elems.is_empty() {
return;
}
let mut elems = wasm_encoder::ElementSection::new();
let mut exps = vec![];
for el in &self.elems {
let elements = match &el.items {
Elements::Expressions(es) => {
exps.clear();
exps.extend(es.iter().map(|e| {
// TODO(nagisa): generate global.get of imported ref globals too.
match e {
Some(i) => match el.ty {
RefType::FUNCREF => wasm_encoder::ConstExpr::ref_func(*i),
_ => unreachable!(),
},
None => wasm_encoder::ConstExpr::ref_null(el.ty.heap_type),
}
}));
wasm_encoder::Elements::Expressions(&exps)
}
Elements::Functions(fs) => wasm_encoder::Elements::Functions(fs),
};
match &el.kind {
ElementKind::Active { table, offset } => {
let offset = match *offset {
Offset::Const32(n) => ConstExpr::i32_const(n),
Offset::Const64(n) => ConstExpr::i64_const(n),
Offset::Global(g) => ConstExpr::global_get(g),
};
elems.active(*table, &offset, el.ty, elements);
}
ElementKind::Passive => {
elems.passive(el.ty, elements);
}
ElementKind::Declared => {
elems.declared(el.ty, elements);
}
}
}
module.section(&elems);
}
fn encode_data_count(&self, module: &mut wasm_encoder::Module) {
// Without bulk memory there's no need for a data count section,
if !self.config.bulk_memory_enabled() {
return;
}
// ... and also if there's no data no need for a data count section.
if self.data.is_empty() {
return;
}
module.section(&wasm_encoder::DataCountSection {
count: u32::try_from(self.data.len()).unwrap(),
});
}
fn encode_code(&self, module: &mut wasm_encoder::Module) {
if self.code.is_empty() {
return;
}
let mut code = wasm_encoder::CodeSection::new();
for c in &self.code {
// Skip the run-length encoding because it is a little
// annoying to compute; use a length of one for every local.
let mut func = wasm_encoder::Function::new(c.locals.iter().map(|l| (1, *l)));
match &c.instructions {
Instructions::Generated(instrs) => {
for instr in instrs {
func.instruction(instr);
}
func.instruction(&wasm_encoder::Instruction::End);
}
Instructions::Arbitrary(body) => {
func.raw(body.iter().copied());
}
}
code.function(&func);
}
module.section(&code);
}
fn encode_data(&self, module: &mut wasm_encoder::Module) {
if self.data.is_empty() {
return;
}
let mut data = wasm_encoder::DataSection::new();
for seg in &self.data {
match &seg.kind {
DataSegmentKind::Active {
memory_index,
offset,
} => {
let offset = match *offset {
Offset::Const32(n) => ConstExpr::i32_const(n),
Offset::Const64(n) => ConstExpr::i64_const(n),
Offset::Global(g) => ConstExpr::global_get(g),
};
data.active(*memory_index, &offset, seg.init.iter().copied());
}
DataSegmentKind::Passive => {
data.passive(seg.init.iter().copied());
}
}
}
module.section(&data);
}
}
pub(crate) fn translate_entity_type(ty: &EntityType) -> wasm_encoder::EntityType {
match ty {
EntityType::Tag(t) => wasm_encoder::EntityType::Tag(wasm_encoder::TagType {
kind: wasm_encoder::TagKind::Exception,
func_type_idx: t.func_type_idx,
}),
EntityType::Func(f, _) => wasm_encoder::EntityType::Function(*f),
EntityType::Table(ty) => (*ty).into(),
EntityType::Memory(m) => (*m).into(),
EntityType::Global(g) => (*g).into(),
}
}
|
