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use move_binary_format::{
access::ModuleAccess,
binary_views::BinaryIndexedView,
errors::{Location, PartialVMError, PartialVMResult, VMResult},
file_format::{
Bytecode, CodeOffset, CodeUnit, CompiledModule, CompiledScript, FieldHandleIndex,
FunctionDefinitionIndex, FunctionHandleIndex, StructDefinitionIndex, TableIndex,
},
};
use move_core_types::vm_status::StatusCode;
pub struct InstructionConsistency<'a> {
resolver: BinaryIndexedView<'a>,
current_function: Option<FunctionDefinitionIndex>,
}
impl<'a> InstructionConsistency<'a> {
pub fn verify_module(module: &'a CompiledModule) -> VMResult<()> {
Self::verify_module_impl(module).map_err(|e| e.finish(Location::Module(module.self_id())))
}
fn verify_module_impl(module: &'a CompiledModule) -> PartialVMResult<()> {
let resolver = BinaryIndexedView::Module(module);
for (idx, func_def) in module.function_defs().iter().enumerate() {
match &func_def.code {
None => (),
Some(code) => {
let checker = Self {
resolver,
current_function: Some(FunctionDefinitionIndex(idx as TableIndex)),
};
checker.check_instructions(code)?
}
}
}
Ok(())
}
pub fn verify_script(module: &'a CompiledScript) -> VMResult<()> {
Self::verify_script_impl(module).map_err(|e| e.finish(Location::Script))
}
pub fn verify_script_impl(script: &'a CompiledScript) -> PartialVMResult<()> {
let checker = Self {
resolver: BinaryIndexedView::Script(script),
current_function: None,
};
checker.check_instructions(&script.code)
}
fn check_instructions(&self, code: &CodeUnit) -> PartialVMResult<()> {
for (offset, instr) in code.code.iter().enumerate() {
use Bytecode::*;
match instr {
MutBorrowField(field_handle_index) => {
self.check_field_op(offset, *field_handle_index, false)?;
}
MutBorrowFieldGeneric(field_inst_index) => {
let field_inst = self.resolver.field_instantiation_at(*field_inst_index)?;
self.check_field_op(offset, field_inst.handle, true)?;
}
ImmBorrowField(field_handle_index) => {
self.check_field_op(offset, *field_handle_index, false)?;
}
ImmBorrowFieldGeneric(field_inst_index) => {
let field_inst = self.resolver.field_instantiation_at(*field_inst_index)?;
self.check_field_op(offset, field_inst.handle, true)?;
}
Call(idx) => {
self.check_function_op(offset, *idx, false)?;
}
CallGeneric(idx) => {
let func_inst = self.resolver.function_instantiation_at(*idx);
self.check_function_op(offset, func_inst.handle, true)?;
}
Pack(idx) => {
self.check_type_op(offset, *idx, false)?;
}
PackGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
Unpack(idx) => {
self.check_type_op(offset, *idx, false)?;
}
UnpackGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
MutBorrowGlobal(idx) => {
self.check_type_op(offset, *idx, false)?;
}
MutBorrowGlobalGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
ImmBorrowGlobal(idx) => {
self.check_type_op(offset, *idx, false)?;
}
ImmBorrowGlobalGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
Exists(idx) => {
self.check_type_op(offset, *idx, false)?;
}
ExistsGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
MoveFrom(idx) => {
self.check_type_op(offset, *idx, false)?;
}
MoveFromGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
MoveTo(idx) => {
self.check_type_op(offset, *idx, false)?;
}
MoveToGeneric(idx) => {
let struct_inst = self.resolver.struct_instantiation_at(*idx)?;
self.check_type_op(offset, struct_inst.def, true)?;
}
FreezeRef | Pop | Ret | Branch(_) | BrTrue(_) | BrFalse(_) | LdU8(_) | LdU64(_)
| LdU128(_) | LdConst(_) | CastU8 | CastU64 | CastU128 | LdTrue | LdFalse
| ReadRef | WriteRef | Add | Sub | Mul | Mod | Div | BitOr | BitAnd | Xor | Shl
| Shr | Or | And | Not | Eq | Neq | Lt | Gt | Le | Ge | CopyLoc(_) | MoveLoc(_)
| StLoc(_) | MutBorrowLoc(_) | ImmBorrowLoc(_) | VecPack(..) | VecLen(_)
| VecImmBorrow(_) | VecMutBorrow(_) | VecPushBack(_) | VecPopBack(_)
| VecUnpack(..) | VecSwap(_) | Abort | Nop => (),
}
}
Ok(())
}
fn check_field_op(
&self,
offset: usize,
field_handle_index: FieldHandleIndex,
generic: bool,
) -> PartialVMResult<()> {
let field_handle = self.resolver.field_handle_at(field_handle_index)?;
self.check_type_op(offset, field_handle.owner, generic)
}
fn current_function(&self) -> FunctionDefinitionIndex {
self.current_function.unwrap_or(FunctionDefinitionIndex(0))
}
fn check_type_op(
&self,
offset: usize,
struct_def_index: StructDefinitionIndex,
generic: bool,
) -> PartialVMResult<()> {
let struct_def = self.resolver.struct_def_at(struct_def_index)?;
let struct_handle = self.resolver.struct_handle_at(struct_def.struct_handle);
if struct_handle.type_parameters.is_empty() == generic {
return Err(
PartialVMError::new(StatusCode::GENERIC_MEMBER_OPCODE_MISMATCH)
.at_code_offset(self.current_function(), offset as CodeOffset),
);
}
Ok(())
}
fn check_function_op(
&self,
offset: usize,
func_handle_index: FunctionHandleIndex,
generic: bool,
) -> PartialVMResult<()> {
let function_handle = self.resolver.function_handle_at(func_handle_index);
if function_handle.type_parameters.is_empty() == generic {
return Err(
PartialVMError::new(StatusCode::GENERIC_MEMBER_OPCODE_MISMATCH)
.at_code_offset(self.current_function(), offset as CodeOffset),
);
}
Ok(())
}
}