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https://github.com/rust-lang/rust.git
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Merge #9474
9474: fix: Inline parameters in `inline_call` if possible r=Veykril a=Veykril Fixes #9491 Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
This commit is contained in:
commit
2bc4f9e371
@ -1,5 +1,7 @@
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use ast::make;
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use hir::{HasSource, PathResolution};
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use ide_db::{defs::Definition, search::FileReference};
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use itertools::izip;
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use syntax::{
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ast::{self, edit::AstNodeEdit, ArgListOwner},
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ted, AstNode,
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@ -15,19 +17,22 @@ use crate::{
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// Inlines a function or method body.
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//
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// ```
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// fn add(a: u32, b: u32) -> u32 { a + b }
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// fn align(a: u32, b: u32) -> u32 {
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// (a + b - 1) & !(b - 1)
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// }
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// fn main() {
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// let x = add$0(1, 2);
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// let x = align$0(1, 2);
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// }
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// ```
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// ->
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// ```
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// fn add(a: u32, b: u32) -> u32 { a + b }
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// fn align(a: u32, b: u32) -> u32 {
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// (a + b - 1) & !(b - 1)
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// }
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// fn main() {
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// let x = {
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// let a = 1;
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// let b = 2;
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// a + b
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// (1 + b - 1) & !(b - 1)
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// };
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// }
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// ```
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@ -69,23 +74,25 @@ pub(crate) fn inline_(
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arg_list: Vec<ast::Expr>,
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expr: ast::Expr,
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) -> Option<()> {
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let hir::InFile { value: function_source, .. } = function.source(ctx.db())?;
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let hir::InFile { value: function_source, file_id } = function.source(ctx.db())?;
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let param_list = function_source.param_list()?;
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let mut assoc_fn_params = function.assoc_fn_params(ctx.sema.db).into_iter();
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let mut params = Vec::new();
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if let Some(self_param) = param_list.self_param() {
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// FIXME this should depend on the receiver as well as the self_param
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params.push(
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params.push((
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make::ident_pat(
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self_param.amp_token().is_some(),
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self_param.mut_token().is_some(),
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make::name("this"),
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)
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.into(),
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);
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assoc_fn_params.next()?,
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));
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}
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for param in param_list.params() {
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params.push(param.pat()?);
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params.push((param.pat()?, assoc_fn_params.next()?));
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}
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if arg_list.len() != params.len() {
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@ -95,8 +102,6 @@ pub(crate) fn inline_(
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return None;
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}
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let new_bindings = params.into_iter().zip(arg_list);
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let body = function_source.body()?;
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acc.add(
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@ -104,32 +109,87 @@ pub(crate) fn inline_(
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label,
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expr.syntax().text_range(),
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|builder| {
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let body = body.clone_for_update();
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let file_id = file_id.original_file(ctx.sema.db);
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let usages_for_locals = |local| {
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Definition::Local(local)
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.usages(&ctx.sema)
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.all()
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.references
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.remove(&file_id)
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.unwrap_or_default()
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.into_iter()
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};
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// Contains the nodes of usages of parameters.
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// If the inner Vec for a parameter is empty it either means there are no usages or that the parameter
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// has a pattern that does not allow inlining
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let param_use_nodes: Vec<Vec<_>> = params
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.iter()
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.map(|(pat, param)| {
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if !matches!(pat, ast::Pat::IdentPat(pat) if pat.is_simple_ident()) {
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return Vec::new();
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}
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usages_for_locals(param.as_local(ctx.sema.db))
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.map(|FileReference { name, range, .. }| match name {
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ast::NameLike::NameRef(_) => body
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.syntax()
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.covering_element(range)
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.ancestors()
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.nth(3)
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.filter(|it| ast::PathExpr::can_cast(it.kind())),
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_ => None,
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})
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.collect::<Option<Vec<_>>>()
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.unwrap_or_default()
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})
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.collect();
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// Rewrite `self` to `this`
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if param_list.self_param().is_some() {
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let this = || make::name_ref("this").syntax().clone_for_update();
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usages_for_locals(params[0].1.as_local(ctx.sema.db))
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.flat_map(|FileReference { name, range, .. }| match name {
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ast::NameLike::NameRef(_) => Some(body.syntax().covering_element(range)),
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_ => None,
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})
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.for_each(|it| {
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ted::replace(it, &this());
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})
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}
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// Inline parameter expressions or generate `let` statements depending on whether inlining works or not.
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for ((pat, _), usages, expr) in izip!(params, param_use_nodes, arg_list).rev() {
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match &*usages {
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// inline single use parameters
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[usage] => {
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ted::replace(usage, expr.syntax().clone_for_update());
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}
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// inline parameters whose expression is a simple local reference
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[_, ..]
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if matches!(&expr,
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ast::Expr::PathExpr(expr)
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if expr.path().and_then(|path| path.as_single_name_ref()).is_some()
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) =>
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{
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usages.into_iter().for_each(|usage| {
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ted::replace(usage, &expr.syntax().clone_for_update());
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});
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}
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// cant inline, emit a let statement
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// FIXME: emit type ascriptions when a coercion happens?
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// FIXME: dont create locals when its not required
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let statements = new_bindings
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.map(|(pattern, value)| make::let_stmt(pattern, Some(value)).into())
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.chain(body.statements());
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_ => body.push_front(make::let_stmt(pat, Some(expr)).clone_for_update().into()),
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}
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}
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let original_indentation = expr.indent_level();
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let mut replacement = make::block_expr(statements, body.tail_expr())
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.reset_indent()
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.indent(original_indentation);
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let replacement = body.reset_indent().indent(original_indentation);
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if param_list.self_param().is_some() {
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replacement = replacement.clone_for_update();
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let this = make::name_ref("this").syntax().clone_for_update();
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// FIXME dont look into descendant methods
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replacement
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.syntax()
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.descendants()
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.filter_map(ast::NameRef::cast)
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.filter(|n| n.self_token().is_some())
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.collect::<Vec<_>>()
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.into_iter()
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.rev()
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.for_each(|self_ref| ted::replace(self_ref.syntax(), &this));
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}
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builder.replace_ast(expr, ast::Expr::BlockExpr(replacement));
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let replacement = match replacement.tail_expr() {
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Some(expr) if replacement.statements().next().is_none() => expr,
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_ => ast::Expr::BlockExpr(replacement),
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};
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builder.replace_ast(expr, replacement);
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},
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)
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}
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@ -153,31 +213,7 @@ fn main() {
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r#"
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fn foo() { println!("Hello, World!"); }
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fn main() {
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{
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println!("Hello, World!");
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};
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}
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"#,
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);
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}
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#[test]
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fn args_with_side_effects() {
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check_assist(
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inline_call,
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r#"
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fn foo(name: String) { println!("Hello, {}!", name); }
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fn main() {
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foo$0(String::from("Michael"));
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}
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"#,
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r#"
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fn foo(name: String) { println!("Hello, {}!", name); }
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fn main() {
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{
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let name = String::from("Michael");
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println!("Hello, {}!", name);
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};
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{ println!("Hello, World!"); };
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}
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"#,
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);
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@ -195,6 +231,32 @@ fn main() { let x = add$0(42); }
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);
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}
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#[test]
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fn args_with_side_effects() {
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check_assist(
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inline_call,
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r#"
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fn foo(name: String) {
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println!("Hello, {}!", name);
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}
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fn main() {
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foo$0(String::from("Michael"));
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}
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"#,
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r#"
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fn foo(name: String) {
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println!("Hello, {}!", name);
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}
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fn main() {
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{
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let name = String::from("Michael");
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println!("Hello, {}!", name);
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};
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}
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"#,
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);
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}
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#[test]
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fn function_with_multiple_statements() {
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check_assist(
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@ -219,9 +281,8 @@ fn foo(a: u32, b: u32) -> u32 {
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fn main() {
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let x = {
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let a = 1;
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let b = 2;
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let x = a + b;
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let x = 1 + b;
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let y = x - b;
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x * y
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};
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@ -257,11 +318,7 @@ impl Foo {
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}
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fn main() {
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let x = {
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let this = Foo(3);
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let a = 2;
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Foo(this.0 + a)
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};
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let x = Foo(Foo(3).0 + 2);
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}
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"#,
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);
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@ -294,11 +351,7 @@ impl Foo {
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}
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fn main() {
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let x = {
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let this = Foo(3);
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let a = 2;
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Foo(this.0 + a)
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};
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let x = Foo(Foo(3).0 + 2);
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}
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"#,
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);
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@ -333,8 +386,7 @@ impl Foo {
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fn main() {
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let x = {
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let ref this = Foo(3);
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let a = 2;
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Foo(this.0 + a)
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Foo(this.0 + 2)
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};
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}
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"#,
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@ -375,6 +427,119 @@ fn main() {
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this.0 = 0;
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};
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}
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"#,
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);
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}
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#[test]
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fn function_single_use_expr_in_param() {
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check_assist(
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inline_call,
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r#"
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fn double(x: u32) -> u32 {
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2 * x
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}
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fn main() {
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let x = 51;
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let x = double$0(10 + x);
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}
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"#,
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r#"
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fn double(x: u32) -> u32 {
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2 * x
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}
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fn main() {
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let x = 51;
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let x = 2 * 10 + x;
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}
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"#,
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);
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}
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#[test]
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fn function_multi_use_expr_in_param() {
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check_assist(
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inline_call,
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r#"
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fn square(x: u32) -> u32 {
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x * x
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}
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fn main() {
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let x = 51;
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let y = square$0(10 + x);
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}
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"#,
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r#"
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fn square(x: u32) -> u32 {
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x * x
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}
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fn main() {
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let x = 51;
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let y = {
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let x = 10 + x;
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x * x
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};
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}
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"#,
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);
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}
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#[test]
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fn function_multi_use_local_in_param() {
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check_assist(
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inline_call,
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r#"
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fn square(x: u32) -> u32 {
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x * x
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}
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fn main() {
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let local = 51;
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let y = square$0(local);
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}
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"#,
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r#"
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fn square(x: u32) -> u32 {
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x * x
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}
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fn main() {
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let local = 51;
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let y = local * local;
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}
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"#,
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);
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}
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#[test]
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fn method_in_impl() {
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check_assist(
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inline_call,
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r#"
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struct Foo;
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impl Foo {
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fn foo(&self) {
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self;
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self;
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}
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fn bar(&self) {
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self.foo$0();
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}
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}
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"#,
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r#"
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struct Foo;
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impl Foo {
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fn foo(&self) {
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self;
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self;
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}
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fn bar(&self) {
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{
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let ref this = self;
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this;
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this;
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};
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}
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}
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"#,
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);
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}
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|
@ -923,18 +923,21 @@ fn doctest_inline_call() {
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check_doc_test(
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"inline_call",
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r#####"
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fn add(a: u32, b: u32) -> u32 { a + b }
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fn align(a: u32, b: u32) -> u32 {
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(a + b - 1) & !(b - 1)
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}
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fn main() {
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let x = add$0(1, 2);
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let x = align$0(1, 2);
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}
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"#####,
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r#####"
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fn add(a: u32, b: u32) -> u32 { a + b }
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fn align(a: u32, b: u32) -> u32 {
|
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(a + b - 1) & !(b - 1)
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}
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fn main() {
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let x = {
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let a = 1;
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let b = 2;
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a + b
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(1 + b - 1) & !(b - 1)
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};
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}
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"#####,
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|
@ -431,6 +431,12 @@ impl ast::RecordExprFieldList {
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}
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}
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impl ast::BlockExpr {
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pub fn push_front(&self, statement: ast::Stmt) {
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ted::insert(Position::after(self.l_curly_token().unwrap()), statement.syntax());
|
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}
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}
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|
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fn normalize_ws_between_braces(node: &SyntaxNode) -> Option<()> {
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let l = node
|
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.children_with_tokens()
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|
@ -641,6 +641,15 @@ impl ast::SlicePat {
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}
|
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}
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|
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impl ast::IdentPat {
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pub fn is_simple_ident(&self) -> bool {
|
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self.at_token().is_none()
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&& self.mut_token().is_none()
|
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&& self.ref_token().is_none()
|
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&& self.pat().is_none()
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}
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}
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|
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#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
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pub enum SelfParamKind {
|
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/// self
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|
@ -187,6 +187,12 @@ fn ws_between(left: &SyntaxElement, right: &SyntaxElement) -> Option<SyntaxToken
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return None;
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}
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|
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if left.kind() == T!['{'] && right.kind() == SyntaxKind::LET_STMT {
|
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let mut indent = IndentLevel::from_element(left);
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indent.0 += 1;
|
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return Some(make::tokens::whitespace(&format!("\n{}", indent)));
|
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}
|
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|
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if right.kind() == SyntaxKind::USE {
|
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let mut indent = IndentLevel::from_element(left);
|
||||
if left.kind() == SyntaxKind::USE {
|
||||
|
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