-// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use crate::utils::{iter_input_pats, span_lint, type_is_unsafe_function};
+use crate::utils::{iter_input_pats, snippet, span_lint, type_is_unsafe_function};
use matches::matches;
use rustc::hir;
use rustc::hir::def::Def;
use rustc::hir::intravisit;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
use rustc::ty;
use rustc::{declare_tool_lint, lint_array};
use rustc_data_structures::fx::FxHashSet;
use rustc_target::spec::abi::Abi;
-use syntax::ast;
use syntax::source_map::Span;
-/// **What it does:** Checks for functions with too many parameters.
-///
-/// **Why is this bad?** Functions with lots of parameters are considered bad
-/// style and reduce readability (“what does the 5th parameter mean?”). Consider
-/// grouping some parameters into a new type.
-///
-/// **Known problems:** None.
-///
-/// **Example:**
-/// ```rust
-/// fn foo(x: u32, y: u32, name: &str, c: Color, w: f32, h: f32, a: f32, b: f32) {
-/// ..
-/// }
-/// ```
declare_clippy_lint! {
+ /// **What it does:** Checks for functions with too many parameters.
+ ///
+ /// **Why is this bad?** Functions with lots of parameters are considered bad
+ /// style and reduce readability (“what does the 5th parameter mean?”). Consider
+ /// grouping some parameters into a new type.
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```rust
+ /// fn foo(x: u32, y: u32, name: &str, c: Color, w: f32, h: f32, a: f32, b: f32) {
+ /// ..
+ /// }
+ /// ```
pub TOO_MANY_ARGUMENTS,
complexity,
"functions with too many arguments"
}
-/// **What it does:** Checks for public functions that dereferences raw pointer
-/// arguments but are not marked unsafe.
-///
-/// **Why is this bad?** The function should probably be marked `unsafe`, since
-/// for an arbitrary raw pointer, there is no way of telling for sure if it is
-/// valid.
-///
-/// **Known problems:**
-///
-/// * It does not check functions recursively so if the pointer is passed to a
-/// private non-`unsafe` function which does the dereferencing, the lint won't
-/// trigger.
-/// * It only checks for arguments whose type are raw pointers, not raw pointers
-/// got from an argument in some other way (`fn foo(bar: &[*const u8])` or
-/// `some_argument.get_raw_ptr()`).
-///
-/// **Example:**
-/// ```rust
-/// pub fn foo(x: *const u8) {
-/// println!("{}", unsafe { *x });
-/// }
-/// ```
declare_clippy_lint! {
+ /// **What it does:** Checks for functions with a large amount of lines.
+ ///
+ /// **Why is this bad?** Functions with a lot of lines are harder to understand
+ /// due to having to look at a larger amount of code to understand what the
+ /// function is doing. Consider splitting the body of the function into
+ /// multiple functions.
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ``` rust
+ /// fn im_too_long() {
+ /// println!("");
+ /// // ... 100 more LoC
+ /// println!("");
+ /// }
+ /// ```
+ pub TOO_MANY_LINES,
+ pedantic,
+ "functions with too many lines"
+}
+
+declare_clippy_lint! {
+ /// **What it does:** Checks for public functions that dereferences raw pointer
+ /// arguments but are not marked unsafe.
+ ///
+ /// **Why is this bad?** The function should probably be marked `unsafe`, since
+ /// for an arbitrary raw pointer, there is no way of telling for sure if it is
+ /// valid.
+ ///
+ /// **Known problems:**
+ ///
+ /// * It does not check functions recursively so if the pointer is passed to a
+ /// private non-`unsafe` function which does the dereferencing, the lint won't
+ /// trigger.
+ /// * It only checks for arguments whose type are raw pointers, not raw pointers
+ /// got from an argument in some other way (`fn foo(bar: &[*const u8])` or
+ /// `some_argument.get_raw_ptr()`).
+ ///
+ /// **Example:**
+ /// ```rust
+ /// pub fn foo(x: *const u8) {
+ /// println!("{}", unsafe { *x });
+ /// }
+ /// ```
pub NOT_UNSAFE_PTR_ARG_DEREF,
correctness,
"public functions dereferencing raw pointer arguments but not marked `unsafe`"
#[derive(Copy, Clone)]
pub struct Functions {
threshold: u64,
+ max_lines: u64,
}
impl Functions {
- pub fn new(threshold: u64) -> Self {
- Self { threshold }
+ pub fn new(threshold: u64, max_lines: u64) -> Self {
+ Self { threshold, max_lines }
}
}
impl LintPass for Functions {
fn get_lints(&self) -> LintArray {
- lint_array!(TOO_MANY_ARGUMENTS, NOT_UNSAFE_PTR_ARG_DEREF)
+ lint_array!(TOO_MANY_ARGUMENTS, TOO_MANY_LINES, NOT_UNSAFE_PTR_ARG_DEREF)
+ }
+
+ fn name(&self) -> &'static str {
+ "Functions"
}
}
decl: &'tcx hir::FnDecl,
body: &'tcx hir::Body,
span: Span,
- nodeid: ast::NodeId,
+ hir_id: hir::HirId,
) {
- let is_impl = if let Some(hir::Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(nodeid)) {
+ let is_impl = if let Some(hir::Node::Item(item)) = cx
+ .tcx
+ .hir()
+ .find_by_hir_id(cx.tcx.hir().get_parent_node_by_hir_id(hir_id))
+ {
matches!(item.node, hir::ItemKind::Impl(_, _, _, _, Some(_), _, _))
} else {
false
}
}
- self.check_raw_ptr(cx, unsafety, decl, body, nodeid);
+ self.check_raw_ptr(cx, unsafety, decl, body, hir_id);
+ self.check_line_number(cx, span, body);
}
fn check_trait_item(&mut self, cx: &LateContext<'a, 'tcx>, item: &'tcx hir::TraitItem) {
if let hir::TraitMethod::Provided(eid) = *eid {
let body = cx.tcx.hir().body(eid);
- self.check_raw_ptr(cx, sig.header.unsafety, &sig.decl, body, item.id);
+ self.check_raw_ptr(cx, sig.header.unsafety, &sig.decl, body, item.hir_id);
}
}
}
}
}
+ fn check_line_number(self, cx: &LateContext<'_, '_>, span: Span, body: &'tcx hir::Body) {
+ if in_external_macro(cx.sess(), span) {
+ return;
+ }
+
+ let code_snippet = snippet(cx, body.value.span, "..");
+ let mut line_count: u64 = 0;
+ let mut in_comment = false;
+ let mut code_in_line;
+
+ // Skip the surrounding function decl.
+ let start_brace_idx = match code_snippet.find('{') {
+ Some(i) => i + 1,
+ None => 0,
+ };
+ let end_brace_idx = match code_snippet.find('}') {
+ Some(i) => i,
+ None => code_snippet.len(),
+ };
+ let function_lines = code_snippet[start_brace_idx..end_brace_idx].lines();
+
+ for mut line in function_lines {
+ code_in_line = false;
+ loop {
+ line = line.trim_start();
+ if line.is_empty() {
+ break;
+ }
+ if in_comment {
+ match line.find("*/") {
+ Some(i) => {
+ line = &line[i + 2..];
+ in_comment = false;
+ continue;
+ },
+ None => break,
+ }
+ } else {
+ let multi_idx = match line.find("/*") {
+ Some(i) => i,
+ None => line.len(),
+ };
+ let single_idx = match line.find("//") {
+ Some(i) => i,
+ None => line.len(),
+ };
+ code_in_line |= multi_idx > 0 && single_idx > 0;
+ // Implies multi_idx is below line.len()
+ if multi_idx < single_idx {
+ line = &line[multi_idx + 2..];
+ in_comment = true;
+ continue;
+ }
+ break;
+ }
+ }
+ if code_in_line {
+ line_count += 1;
+ }
+ }
+
+ if line_count > self.max_lines {
+ span_lint(cx, TOO_MANY_LINES, span, "This function has a large number of lines.")
+ }
+ }
+
fn check_raw_ptr(
self,
cx: &LateContext<'a, 'tcx>,
unsafety: hir::Unsafety,
decl: &'tcx hir::FnDecl,
body: &'tcx hir::Body,
- nodeid: ast::NodeId,
+ hir_id: hir::HirId,
) {
let expr = &body.value;
- if unsafety == hir::Unsafety::Normal && cx.access_levels.is_exported(nodeid) {
+ if unsafety == hir::Unsafety::Normal && cx.access_levels.is_exported(hir_id) {
let raw_ptrs = iter_input_pats(decl, body)
.zip(decl.inputs.iter())
.filter_map(|(arg, ty)| raw_ptr_arg(arg, ty))
}
}
-fn raw_ptr_arg(arg: &hir::Arg, ty: &hir::Ty) -> Option<ast::NodeId> {
+fn raw_ptr_arg(arg: &hir::Arg, ty: &hir::Ty) -> Option<hir::HirId> {
if let (&hir::PatKind::Binding(_, id, _, _), &hir::TyKind::Ptr(_)) = (&arg.pat.node, &ty.node) {
Some(id)
} else {
struct DerefVisitor<'a, 'tcx: 'a> {
cx: &'a LateContext<'a, 'tcx>,
- ptrs: FxHashSet<ast::NodeId>,
+ ptrs: FxHashSet<hir::HirId>,
tables: &'a ty::TypeckTables<'tcx>,
}
}
},
hir::ExprKind::MethodCall(_, _, ref args) => {
- let def_id = self.tables.type_dependent_defs()[expr.hir_id].def_id();
+ let def_id = self.tables.type_dependent_def_id(expr.hir_id).unwrap();
let base_type = self.cx.tcx.type_of(def_id);
if type_is_unsafe_function(self.cx, base_type) {
fn check_arg(&self, ptr: &hir::Expr) {
if let hir::ExprKind::Path(ref qpath) = ptr.node {
if let Def::Local(id) = self.cx.tables.qpath_def(qpath, ptr.hir_id) {
- if self.ptrs.contains(&id) {
+ if self.ptrs.contains(&self.cx.tcx.hir().node_to_hir_id(id)) {
span_lint(
self.cx,
NOT_UNSAFE_PTR_ARG_DEREF,
projects / rust.git / blobdiff