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use move_binary_format::{
access::ModuleAccess,
errors::{PartialVMError, PartialVMResult},
file_format::{
Bytecode, CodeOffset, CompiledModule, FunctionDefinition, FunctionDefinitionIndex,
FunctionHandle, FunctionHandleIndex, StructDefinitionIndex,
},
};
use move_core_types::vm_status::StatusCode;
use std::collections::{BTreeSet, HashMap};
pub(crate) struct AcquiresVerifier<'a> {
module: &'a CompiledModule,
current_function: FunctionDefinitionIndex,
annotated_acquires: BTreeSet<StructDefinitionIndex>,
actual_acquires: BTreeSet<StructDefinitionIndex>,
handle_to_def: HashMap<FunctionHandleIndex, &'a FunctionDefinition>,
}
impl<'a> AcquiresVerifier<'a> {
pub(crate) fn verify(
module: &'a CompiledModule,
index: FunctionDefinitionIndex,
function_definition: &'a FunctionDefinition,
) -> PartialVMResult<()> {
let annotated_acquires = function_definition
.acquires_global_resources
.iter()
.cloned()
.collect();
let mut handle_to_def = HashMap::new();
for func_def in module.function_defs() {
handle_to_def.insert(func_def.function, func_def);
}
let mut verifier = Self {
module,
current_function: index,
annotated_acquires,
actual_acquires: BTreeSet::new(),
handle_to_def,
};
for (offset, instruction) in function_definition
.code
.as_ref()
.unwrap()
.code
.iter()
.enumerate()
{
verifier.verify_instruction(instruction, offset as CodeOffset)?
}
for annotation in verifier.annotated_acquires {
if !verifier.actual_acquires.contains(&annotation) {
return Err(PartialVMError::new(
StatusCode::EXTRANEOUS_ACQUIRES_ANNOTATION,
));
}
let struct_def = module.struct_defs().get(annotation.0 as usize).unwrap();
let struct_handle = module.struct_handle_at(struct_def.struct_handle);
if !struct_handle.abilities.has_key() {
return Err(PartialVMError::new(StatusCode::INVALID_ACQUIRES_ANNOTATION));
}
}
Ok(())
}
fn verify_instruction(
&mut self,
instruction: &Bytecode,
offset: CodeOffset,
) -> PartialVMResult<()> {
match instruction {
Bytecode::Call(idx) => self.call_acquire(*idx, offset),
Bytecode::CallGeneric(idx) => {
let fi = self.module.function_instantiation_at(*idx);
self.call_acquire(fi.handle, offset)
}
Bytecode::MoveFrom(idx)
| Bytecode::MutBorrowGlobal(idx)
| Bytecode::ImmBorrowGlobal(idx) => self.struct_acquire(*idx, offset),
Bytecode::MoveFromGeneric(idx)
| Bytecode::MutBorrowGlobalGeneric(idx)
| Bytecode::ImmBorrowGlobalGeneric(idx) => {
let si = self.module.struct_instantiation_at(*idx);
self.struct_acquire(si.def, offset)
}
_ => Ok(()),
}
}
fn call_acquire(
&mut self,
fh_idx: FunctionHandleIndex,
offset: CodeOffset,
) -> PartialVMResult<()> {
let function_handle = self.module.function_handle_at(fh_idx);
let mut function_acquired_resources =
self.function_acquired_resources(function_handle, fh_idx);
for acquired_resource in &function_acquired_resources {
if !self.annotated_acquires.contains(acquired_resource) {
return Err(self.error(StatusCode::MISSING_ACQUIRES_ANNOTATION, offset));
}
}
self.actual_acquires
.append(&mut function_acquired_resources);
Ok(())
}
fn struct_acquire(
&mut self,
sd_idx: StructDefinitionIndex,
offset: CodeOffset,
) -> PartialVMResult<()> {
if self.annotated_acquires.contains(&sd_idx) {
self.actual_acquires.insert(sd_idx);
Ok(())
} else {
Err(self.error(StatusCode::MISSING_ACQUIRES_ANNOTATION, offset))
}
}
fn function_acquired_resources(
&self,
function_handle: &FunctionHandle,
fh_idx: FunctionHandleIndex,
) -> BTreeSet<StructDefinitionIndex> {
if function_handle.module != self.module.self_handle_idx() {
return BTreeSet::new();
}
match self.handle_to_def.get(&fh_idx) {
Some(func_def) => func_def.acquires_global_resources.iter().cloned().collect(),
None => BTreeSet::new(),
}
}
fn error(&self, status: StatusCode, offset: CodeOffset) -> PartialVMError {
PartialVMError::new(status).at_code_offset(self.current_function, offset)
}
}