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use crate::{options::ModuleGeneratorOptions, padding::Pad, utils::random_string};
use bytecode_verifier::verify_module;
use ir_to_bytecode::compiler::compile_module;
use move_binary_format::file_format::CompiledModule;
use move_core_types::account_address::AccountAddress;
use move_ir_types::{ast::*, location::*};
use move_symbol_pool::Symbol;
use rand::{rngs::StdRng, Rng};
use std::{
collections::{BTreeSet, VecDeque},
iter::FromIterator,
};
type Set<K> = BTreeSet<K>;
macro_rules! init {
($len:expr, $e:expr) => {
(0..$len).map(|_| $e).collect()
};
}
pub fn generate_module(rng: &mut StdRng, options: ModuleGeneratorOptions) -> CompiledModule {
generate_modules(rng, 1, options).0
}
pub fn generate_modules(
rng: &mut StdRng,
number: usize,
options: ModuleGeneratorOptions,
) -> (CompiledModule, Vec<CompiledModule>) {
assert!(number > 0, "We cannot generate zero modules");
let table_size = options.min_table_size;
let (callee_names, callees): (Set<Symbol>, Vec<ModuleDefinition>) = (0..(number - 1))
.map(|_| {
let module = ModuleGenerator::create(rng, options.clone(), &Set::new());
let module_name = module.identifier.name.0;
(module_name, module)
})
.unzip();
let root_module = ModuleGenerator::create(rng, options.clone(), &callee_names);
let empty_deps: Vec<CompiledModule> = Vec::new();
let compiled_callees = callees
.into_iter()
.map(|module| {
let mut module = compile_module(module, &empty_deps).unwrap().0;
Pad::pad(table_size, &mut module, options.clone());
module
})
.collect();
let mut compiled_root = compile_module(root_module, &compiled_callees).unwrap().0;
Pad::pad(table_size, &mut compiled_root, options);
(compiled_root, compiled_callees)
}
pub fn generate_verified_modules(
rng: &mut StdRng,
number: usize,
options: ModuleGeneratorOptions,
) -> (CompiledModule, Vec<CompiledModule>) {
let (root, callees) = generate_modules(rng, number, options);
for callee in &callees {
verify_module(callee).unwrap()
}
verify_module(&root).unwrap();
(root, callees)
}
pub struct ModuleGenerator<'a> {
options: ModuleGeneratorOptions,
current_module: ModuleDefinition,
gen: &'a mut StdRng,
}
impl<'a> ModuleGenerator<'a> {
fn index(&mut self, bound: usize) -> usize {
self.gen.gen_range(0..bound)
}
fn identifier(&mut self) -> String {
let len = self.gen.gen_range(10..self.options.max_string_size);
random_string(self.gen, len)
}
fn base_type(&mut self, ty_param_context: &[&TypeVar]) -> Type {
let structs: Vec<_> = self
.current_module
.structs
.iter()
.filter(|s| !s.value.abilities.contains(&Ability::Key))
.cloned()
.collect();
let mut end = 5;
if !ty_param_context.is_empty() {
end += 1;
};
if !structs.is_empty() {
end += 1;
};
match self.index(end) {
0 => Type::Address,
1 => Type::U8,
2 => Type::U64,
3 => Type::U128,
4 => Type::Bool,
5 if !structs.is_empty() => {
let index = self.index(structs.len());
let struct_def = structs[index].value.clone();
let ty_instants = {
let num_typ_params = struct_def.type_formals.len();
init!(num_typ_params, self.base_type(ty_param_context))
};
let struct_ident = {
let struct_name = struct_def.name;
let module_name = ModuleName::module_self();
QualifiedStructIdent::new(module_name, struct_name)
};
Type::Struct(struct_ident, ty_instants)
}
_ => {
let index = self.index(ty_param_context.len());
let ty_var = ty_param_context[index].value.clone();
Type::TypeParameter(ty_var)
}
}
}
fn typ(&mut self, ty_param_context: &[(TypeVar, BTreeSet<Ability>)]) -> Type {
let typ = self.base_type(
&ty_param_context
.iter()
.map(|(tv, _)| tv)
.collect::<Vec<_>>(),
);
if self.options.references_allowed && self.gen.gen_bool(0.25) {
let is_mutable = self.gen.gen_bool(0.25);
Type::Reference(is_mutable, Box::new(typ))
} else {
typ
}
}
fn fun_type_parameters(&mut self) -> Vec<(TypeVar, BTreeSet<Ability>)> {
if self.options.simple_types_only {
vec![]
} else {
let num_ty_params = self.index(self.options.max_ty_params);
let abilities = BTreeSet::from_iter(vec![Ability::Copy, Ability::Drop]);
init!(num_ty_params, {
let name = Spanned::unsafe_no_loc(TypeVar_(self.identifier().into()));
(name, abilities.clone())
})
}
}
fn struct_type_parameters(&mut self) -> Vec<StructTypeParameter> {
if self.options.simple_types_only {
vec![]
} else {
let is_phantom = self.index(1) != 0;
let num_ty_params = self.index(self.options.max_ty_params);
let abilities = BTreeSet::from_iter(vec![Ability::Copy, Ability::Drop]);
init!(num_ty_params, {
let name = Spanned::unsafe_no_loc(TypeVar_(self.identifier().into()));
(is_phantom, name, abilities.clone())
})
}
}
fn function_signature(&mut self) -> FunctionSignature {
let ty_params = self.fun_type_parameters();
let number_of_args = self.index(self.options.max_function_call_size);
let mut formals: Vec<(Var, Type)> = init!(number_of_args, {
let param_name = Spanned::unsafe_no_loc(Var_(self.identifier().into()));
let ty = self.typ(&ty_params);
(param_name, ty)
});
if self.options.args_for_ty_params {
let mut ty_formals = ty_params
.iter()
.map(|(ty_var_, _)| {
let param_name = Spanned::unsafe_no_loc(Var_(self.identifier().into()));
let ty = Type::TypeParameter(ty_var_.value.clone());
(param_name, ty)
})
.collect();
formals.append(&mut ty_formals);
}
FunctionSignature::new(formals, vec![], ty_params)
}
fn struct_fields(&mut self, ty_params: &[StructTypeParameter]) -> StructDefinitionFields {
let num_fields = self
.gen
.gen_range(self.options.min_fields..self.options.max_fields);
let fields: Fields<Type> = init!(num_fields, {
(
Spanned::unsafe_no_loc(Field_(self.identifier().into())),
self.base_type(&ty_params.iter().map(|(_, tv, _)| tv).collect::<Vec<_>>()),
)
});
StructDefinitionFields::Move { fields }
}
fn function_def(&mut self) {
let signature = self.function_signature();
let num_locals = self.index(self.options.max_locals);
let locals = init!(num_locals, {
(
Spanned::unsafe_no_loc(Var_(self.identifier().into())),
self.typ(&signature.type_formals),
)
});
let fun = Function_ {
visibility: FunctionVisibility::Public,
acquires: Vec::new(),
specifications: Vec::new(),
signature,
body: FunctionBody::Move {
locals,
code: Block_ {
stmts: VecDeque::from(vec![Statement::CommandStatement(
Spanned::unsafe_no_loc(Cmd_::return_empty()),
)]),
},
},
};
let fun_name = FunctionName(self.identifier().into());
self.current_module
.functions
.push((fun_name, Spanned::unsafe_no_loc(fun)));
}
fn struct_def(&mut self, abilities: BTreeSet<Ability>) {
let name = StructName(self.identifier().into());
let type_parameters = self.struct_type_parameters();
let fields = self.struct_fields(&type_parameters);
let strct = StructDefinition_ {
abilities,
name,
type_formals: type_parameters,
fields,
invariants: vec![],
};
self.current_module
.structs
.push(Spanned::unsafe_no_loc(strct))
}
fn imports(callees: &Set<Symbol>) -> Vec<ImportDefinition> {
callees
.iter()
.map(|ident| {
let module_name = ModuleName(*ident);
let qualified_mod_ident = ModuleIdent::new(module_name, AccountAddress::ZERO);
ImportDefinition::new(qualified_mod_ident, None)
})
.collect()
}
fn gen(mut self) -> ModuleDefinition {
let num_structs = self.index(self.options.max_structs) + 1;
let num_functions = self.index(self.options.max_functions) + 1;
{
let simple_types = self.options.simple_types_only;
self.options.simple_types_only = true;
self.function_def();
self.options.simple_types_only = simple_types;
}
let abilities = BTreeSet::from_iter(vec![Ability::Copy, Ability::Drop, Ability::Store]);
(0..num_structs).for_each(|_| self.struct_def(abilities.clone()));
(0..num_functions).for_each(|_| self.function_def());
if self.options.add_resources {
let abilities = BTreeSet::from_iter(vec![Ability::Key, Ability::Store]);
(0..num_structs).for_each(|_| self.struct_def(abilities.clone()));
}
self.current_module
}
pub fn create(
gen: &'a mut StdRng,
options: ModuleGeneratorOptions,
callable_modules: &Set<Symbol>,
) -> ModuleDefinition {
let module_name = {
let len = gen.gen_range(10..options.max_string_size);
random_string(gen, len)
};
let current_module = ModuleDefinition {
identifier: ModuleIdent {
name: ModuleName(module_name.into()),
address: AccountAddress::random(),
},
friends: Vec::new(),
imports: Self::imports(callable_modules),
explicit_dependency_declarations: Vec::new(),
structs: Vec::new(),
functions: Vec::new(),
constants: Vec::new(),
synthetics: Vec::new(),
};
Self {
options,
current_module,
gen,
}
.gen()
}
}