Reject recursive calls in inline_call

crates/ide_assists/src/handlers/inline_call.rs

@@ -1,7 +1,10 @@
 use ast::make;
 use hir::{db::HirDatabase, HasSource, PathResolution, Semantics, TypeInfo};
 use ide_db::{
-    base_db::FileId, defs::Definition, path_transform::PathTransform, search::FileReference,
+    base_db::{FileId, FileRange},
+    defs::Definition,
+    path_transform::PathTransform,
+    search::{FileReference, SearchScope},
     RootDatabase,
 };
 use itertools::izip;
@@ -54,11 +57,14 @@ use crate::{
 // }
 // ```
 pub(crate) fn inline_into_callers(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
+    let def_file = ctx.frange.file_id;
     let name = ctx.find_node_at_offset::<ast::Name>()?;
-    let func_syn = name.syntax().parent().and_then(ast::Fn::cast)?;
-    let func_body = func_syn.body()?;
-    let param_list = func_syn.param_list()?;
-    let function = ctx.sema.to_def(&func_syn)?;
+    let ast_func = name.syntax().parent().and_then(ast::Fn::cast)?;
+    let func_body = ast_func.body()?;
+    let param_list = ast_func.param_list()?;
+
+    let function = ctx.sema.to_def(&ast_func)?;
+
     let params = get_fn_params(ctx.sema.db, function, &param_list)?;
 
     let usages = Definition::ModuleDef(hir::ModuleDef::Function(function)).usages(&ctx.sema);
@@ -66,19 +72,28 @@ pub(crate) fn inline_into_callers(acc: &mut Assists, ctx: &AssistContext) -> Opt
         return None;
     }
 
+    let is_recursive_fn = usages
+        .clone()
+        .in_scope(SearchScope::file_range(FileRange {
+            file_id: def_file,
+            range: func_body.syntax().text_range(),
+        }))
+        .at_least_one();
+    if is_recursive_fn {
+        cov_mark::hit!(inline_into_callers_recursive);
+        return None;
+    }
+
     acc.add(
         AssistId("inline_into_callers", AssistKind::RefactorInline),
         "Inline into all callers",
         name.syntax().text_range(),
         |builder| {
-            let def_file = ctx.frange.file_id;
-            let usages =
-                Definition::ModuleDef(hir::ModuleDef::Function(function)).usages(&ctx.sema);
             let mut usages = usages.all();
             let current_file_usage = usages.references.remove(&def_file);
 
-            let mut can_remove = true;
-            let mut inline_refs = |file_id, refs: Vec<FileReference>| {
+            let mut remove_def = true;
+            let mut inline_refs_for_file = |file_id, refs: Vec<FileReference>| {
                 builder.edit_file(file_id);
                 let count = refs.len();
                 let name_refs = refs.into_iter().filter_map(|file_ref| match file_ref.name {
@@ -124,18 +139,18 @@ pub(crate) fn inline_into_callers(acc: &mut Assists, ctx: &AssistContext) -> Opt
                         );
                     })
                     .count();
-                can_remove &= replaced == count;
+                remove_def &= replaced == count;
             };
             for (file_id, refs) in usages.into_iter() {
-                inline_refs(file_id, refs);
+                inline_refs_for_file(file_id, refs);
             }
             if let Some(refs) = current_file_usage {
-                inline_refs(def_file, refs);
+                inline_refs_for_file(def_file, refs);
             } else {
                 builder.edit_file(def_file);
             }
-            if can_remove {
-                builder.delete(func_syn.syntax().text_range());
+            if remove_def {
+                builder.delete(ast_func.syntax().text_range());
             }
         },
     )
@@ -201,10 +216,15 @@ pub(crate) fn inline_call(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
             )
         };
 
-    let hir::InFile { value: function_source, file_id } = function.source(ctx.db())?;
-    let fn_body = function_source.body()?;
-    let param_list = function_source.param_list()?;
+    let fn_source = function.source(ctx.db())?;
+    let fn_body = fn_source.value.body()?;
+    let param_list = fn_source.value.param_list()?;
 
+    let FileRange { file_id, range } = fn_source.syntax().original_file_range(ctx.sema.db);
+    if file_id == ctx.frange.file_id && range.contains(ctx.frange.range.start()) {
+        cov_mark::hit!(inline_call_recursive);
+        return None;
+    }
     let params = get_fn_params(ctx.sema.db, function, &param_list)?;
 
     if call_info.arguments.len() != params.len() {
@@ -220,7 +240,6 @@ pub(crate) fn inline_call(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
         label,
         syntax.text_range(),
         |builder| {
-            let file_id = file_id.original_file(ctx.sema.db);
             let replacement = inline(&ctx.sema, file_id, function, &fn_body, &params, &call_info);
 
             builder.replace_ast(
@@ -967,6 +986,32 @@ fn foo() {
         foo * 0 + foo
     };
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn inline_callers_recursive() {
+        cov_mark::check!(inline_into_callers_recursive);
+        check_assist_not_applicable(
+            inline_into_callers,
+            r#"
+fn foo$0() {
+    foo();
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn inline_call_recursive() {
+        cov_mark::check!(inline_call_recursive);
+        check_assist_not_applicable(
+            inline_call,
+            r#"
+fn foo() {
+    foo$0();
+}
 "#,
         );
     }

crates/ide_db/src/search.rs

@@ -315,6 +315,7 @@ impl Definition {
     }
 }
 
+#[derive(Clone)]
 pub struct FindUsages<'a> {
     def: Definition,
     sema: &'a Semantics<'a, RootDatabase>,
@@ -341,7 +342,7 @@ impl<'a> FindUsages<'a> {
         self
     }
 
-    pub fn at_least_one(self) -> bool {
+    pub fn at_least_one(&self) -> bool {
         let mut found = false;
         self.search(&mut |_, _| {
             found = true;
@@ -359,7 +360,7 @@ impl<'a> FindUsages<'a> {
         res
     }
 
-    fn search(self, sink: &mut dyn FnMut(FileId, FileReference) -> bool) {
+    fn search(&self, sink: &mut dyn FnMut(FileId, FileReference) -> bool) {
         let _p = profile::span("FindUsages:search");
         let sema = self.sema;