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|
//! Provides validations for unsafe code. Currently checks if unsafe functions are missing
//! unsafe blocks.
use std::sync::Arc;
use hir_def::{
body::Body,
expr::{Expr, ExprId, UnaryOp},
DefWithBodyId,
};
use hir_expand::diagnostics::DiagnosticSink;
use crate::{
db::HirDatabase, diagnostics::MissingUnsafe, lower::CallableDefId, ApplicationTy,
InferenceResult, Ty, TypeCtor,
};
pub(super) struct UnsafeValidator<'a, 'b: 'a> {
owner: DefWithBodyId,
infer: Arc<InferenceResult>,
sink: &'a mut DiagnosticSink<'b>,
}
impl<'a, 'b> UnsafeValidator<'a, 'b> {
pub(super) fn new(
owner: DefWithBodyId,
infer: Arc<InferenceResult>,
sink: &'a mut DiagnosticSink<'b>,
) -> UnsafeValidator<'a, 'b> {
UnsafeValidator { owner, infer, sink }
}
pub(super) fn validate_body(&mut self, db: &dyn HirDatabase) {
let def = self.owner.into();
let unsafe_expressions = unsafe_expressions(db, self.infer.as_ref(), def);
let is_unsafe = match self.owner {
DefWithBodyId::FunctionId(it) => db.function_data(it).is_unsafe,
DefWithBodyId::StaticId(_) | DefWithBodyId::ConstId(_) => false,
};
if is_unsafe
|| unsafe_expressions
.iter()
.filter(|unsafe_expr| !unsafe_expr.inside_unsafe_block)
.count()
== 0
{
return;
}
let (_, body_source) = db.body_with_source_map(def);
for unsafe_expr in unsafe_expressions {
if !unsafe_expr.inside_unsafe_block {
if let Ok(in_file) = body_source.as_ref().expr_syntax(unsafe_expr.expr) {
self.sink.push(MissingUnsafe { file: in_file.file_id, expr: in_file.value })
}
}
}
}
}
pub struct UnsafeExpr {
pub expr: ExprId,
pub inside_unsafe_block: bool,
}
pub fn unsafe_expressions(
db: &dyn HirDatabase,
infer: &InferenceResult,
def: DefWithBodyId,
) -> Vec<UnsafeExpr> {
let mut unsafe_exprs = vec![];
let body = db.body(def);
walk_unsafe(&mut unsafe_exprs, db, infer, &body, body.body_expr, false);
unsafe_exprs
}
fn walk_unsafe(
unsafe_exprs: &mut Vec<UnsafeExpr>,
db: &dyn HirDatabase,
infer: &InferenceResult,
body: &Body,
current: ExprId,
inside_unsafe_block: bool,
) {
let expr = &body.exprs[current];
match expr {
Expr::Call { callee, .. } => {
let ty = &infer[*callee];
if let &Ty::Apply(ApplicationTy {
ctor: TypeCtor::FnDef(CallableDefId::FunctionId(func)),
..
}) = ty
{
if db.function_data(func).is_unsafe {
unsafe_exprs.push(UnsafeExpr { expr: current, inside_unsafe_block });
}
}
}
Expr::MethodCall { .. } => {
if infer
.method_resolution(current)
.map(|func| db.function_data(func).is_unsafe)
.unwrap_or(false)
{
unsafe_exprs.push(UnsafeExpr { expr: current, inside_unsafe_block });
}
}
Expr::UnaryOp { expr, op: UnaryOp::Deref } => {
if let Ty::Apply(ApplicationTy { ctor: TypeCtor::RawPtr(..), .. }) = &infer[*expr] {
unsafe_exprs.push(UnsafeExpr { expr: current, inside_unsafe_block });
}
}
Expr::Unsafe { body: child } => {
return walk_unsafe(unsafe_exprs, db, infer, body, *child, true);
}
_ => {}
}
expr.walk_child_exprs(|child| {
walk_unsafe(unsafe_exprs, db, infer, body, child, inside_unsafe_block);
});
}
#[cfg(test)]
mod tests {
use crate::diagnostics::tests::check_diagnostics;
#[test]
fn missing_unsafe_diagnostic_with_raw_ptr() {
check_diagnostics(
r#"
fn main() {
let x = &5 as *const usize;
unsafe { let y = *x; }
let z = *x;
} //^^ This operation is unsafe and requires an unsafe function or block
"#,
)
}
#[test]
fn missing_unsafe_diagnostic_with_unsafe_call() {
check_diagnostics(
r#"
struct HasUnsafe;
impl HasUnsafe {
unsafe fn unsafe_fn(&self) {
let x = &5 as *const usize;
let y = *x;
}
}
unsafe fn unsafe_fn() {
let x = &5 as *const usize;
let y = *x;
}
fn main() {
unsafe_fn();
//^^^^^^^^^^^ This operation is unsafe and requires an unsafe function or block
HasUnsafe.unsafe_fn();
//^^^^^^^^^^^^^^^^^^^^^ This operation is unsafe and requires an unsafe function or block
unsafe {
unsafe_fn();
HasUnsafe.unsafe_fn();
}
}
"#,
);
}
}
|
