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use std::collections::HashMap;
use walrus::*;
#[derive(Clone, Copy, PartialEq)]
pub enum InjectionKind {
Static,
Dynamic,
Dynamic64,
}
pub struct FunctionCost(HashMap<FunctionId, (i64, InjectionKind)>);
impl FunctionCost {
pub fn new(m: &Module) -> Self {
let mut res = HashMap::new();
for (method, func) in m.imports.iter().filter_map(|i| {
if let ImportKind::Function(func) = i.kind {
if i.module == "ic0" {
Some((i.name.as_str(), func))
} else {
None
}
} else {
None
}
}) {
use InjectionKind::*;
let cost = match method {
"msg_arg_data_copy" => (21, Dynamic),
"msg_method_name_copy" => (21, Dynamic),
"msg_reply_data_append" => (21, Dynamic),
"msg_reject" => (21, Dynamic),
"msg_reject_msg_copy" => (21, Dynamic),
"debug_print" => (101, Dynamic),
"trap" => (21, Dynamic),
"call_new" => (1, Static),
"call_data_append" => (21, Dynamic),
"call_perform" => (1, Static),
"stable_read" => (21, Dynamic),
"stable_write" => (21, Dynamic),
"stable64_read" => (21, Dynamic64),
"stable64_write" => (21, Dynamic64),
"performance_counter" => (201, Static),
_ => (1, Static),
};
res.insert(func, cost);
}
Self(res)
}
pub fn get_cost(&self, id: FunctionId) -> (i64, InjectionKind) {
*self.0.get(&id).unwrap_or(&(1, InjectionKind::Static))
}
}
pub fn get_ic_func_id(m: &mut Module, method: &str) -> FunctionId {
match m.imports.find("ic0", method) {
Some(id) => match m.imports.get(id).kind {
ImportKind::Function(func_id) => func_id,
_ => unreachable!(),
},
None => {
let ty = match method {
"stable_write" => m
.types
.add(&[ValType::I32, ValType::I32, ValType::I32], &[]),
"stable64_write" => m
.types
.add(&[ValType::I64, ValType::I64, ValType::I64], &[]),
"stable_read" => m
.types
.add(&[ValType::I32, ValType::I32, ValType::I32], &[]),
"stable64_read" => m
.types
.add(&[ValType::I64, ValType::I64, ValType::I64], &[]),
"stable_grow" => m.types.add(&[ValType::I32], &[ValType::I32]),
"stable64_grow" => m.types.add(&[ValType::I64], &[ValType::I64]),
"stable_size" => m.types.add(&[], &[ValType::I32]),
"stable64_size" => m.types.add(&[], &[ValType::I64]),
"call_cycles_add" => m.types.add(&[ValType::I64], &[]),
"call_cycles_add128" => m.types.add(&[ValType::I64, ValType::I64], &[]),
"debug_print" => m.types.add(&[ValType::I32, ValType::I32], &[]),
"trap" => m.types.add(&[ValType::I32, ValType::I32], &[]),
"msg_reply_data_append" => m.types.add(&[ValType::I32, ValType::I32], &[]),
"msg_reply" => m.types.add(&[], &[]),
_ => unreachable!(),
};
m.add_import_func("ic0", method, ty).0
}
}
}
pub fn get_memory_id(m: &Module) -> MemoryId {
m.memories
.iter()
.next()
.expect("only single memory is supported")
.id()
}
pub fn get_export_func_id(m: &Module, method: &str) -> Option<FunctionId> {
let e = m.exports.iter().find(|e| e.name == method)?;
if let ExportItem::Function(id) = e.item {
Some(id)
} else {
None
}
}
pub fn get_builder(m: &mut Module, id: FunctionId) -> InstrSeqBuilder<'_> {
if let FunctionKind::Local(func) = &mut m.funcs.get_mut(id).kind {
let id = func.entry_block();
func.builder_mut().instr_seq(id)
} else {
unreachable!()
}
}
pub fn inject_top(builder: &mut InstrSeqBuilder<'_>, instrs: Vec<ir::Instr>) {
for instr in instrs.into_iter().rev() {
builder.instr_at(0, instr);
}
}
pub fn get_func_name(m: &Module, id: FunctionId) -> String {
m.funcs
.get(id)
.name
.as_ref()
.unwrap_or(&format!("func_{}", id.index()))
.to_string()
}
pub fn is_motoko_canister(m: &Module) -> bool {
m.customs.iter().any(|(_, s)| {
s.name() == "icp:private motoko:compiler" || s.name() == "icp:public motoko:compiler"
}) || m
.exports
.iter()
.any(|e| e.name == "canister_update __motoko_async_helper")
}
pub fn is_motoko_wasm_data_section(blob: &[u8]) -> Option<&[u8]> {
let len = blob.len() as u32;
if len > 100
&& blob[0..4] == [0x11, 0x00, 0x00, 0x00]
&& blob[8..12] == [0x00, 0x61, 0x73, 0x6d]
{
let decoded_len = u32::from_le_bytes(blob[4..8].try_into().unwrap());
if decoded_len + 8 == len {
return Some(&blob[8..]);
}
}
None
}
pub fn get_motoko_wasm_data_sections(m: &Module) -> Vec<(DataId, Module)> {
m.data
.iter()
.filter_map(|d| {
let blob = is_motoko_wasm_data_section(&d.value)?;
let mut config = ModuleConfig::new();
config.generate_name_section(false);
config.generate_producers_section(false);
let m = config.parse(blob).ok()?;
Some((d.id(), m))
})
.collect()
}
pub fn encode_module_as_data_section(mut m: Module) -> Vec<u8> {
let blob = m.emit_wasm();
let blob_len = blob.len();
let mut res = Vec::with_capacity(blob_len + 8);
res.extend_from_slice(&[0x11, 0x00, 0x00, 0x00]);
let encoded_len = (blob_len as u32).to_le_bytes();
res.extend_from_slice(&encoded_len);
res.extend_from_slice(&blob);
res
}
