-use rustc::hir::{Expr, ExprKind};
+use crate::consts::{constant, Constant};
+use crate::utils::{is_direct_expn_of, is_expn_of, match_qpath, span_help_and_lint};
+use if_chain::if_chain;
+use rustc::hir::*;
use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
use rustc::{declare_lint_pass, declare_tool_lint};
-
-use crate::consts::{constant, Constant};
-use crate::utils::{is_direct_expn_of, is_expn_of, span_help_and_lint};
+use syntax::ast::LitKind;
+use syntax::source_map::symbol::LocalInternedString;
declare_clippy_lint! {
/// **What it does:** Checks for `assert!(true)` and `assert!(false)` calls.
if assert_span.from_expansion() {
return;
}
- lint_assert_cb(false);
+ if let Some((panic_message, is_true)) = assert_with_message(&cx, e) {
+ if is_true {
+ span_help_and_lint(
+ cx,
+ ASSERTIONS_ON_CONSTANTS,
+ e.span,
+ "`assert!(true)` will be optimized out by the compiler",
+ "remove it",
+ );
+ } else if panic_message.starts_with("assertion failed: ") {
+ span_help_and_lint(
+ cx,
+ ASSERTIONS_ON_CONSTANTS,
+ e.span,
+ "`assert!(false)` should probably be replaced",
+ "use `panic!()` or `unreachable!()`",
+ );
+ } else {
+ span_help_and_lint(
+ cx,
+ ASSERTIONS_ON_CONSTANTS,
+ e.span,
+ &format!("`assert!(false, \"{}\")` should probably be replaced", panic_message,),
+ &format!(
+ "use `panic!(\"{}\")` or `unreachable!(\"{}\")`",
+ panic_message, panic_message,
+ ),
+ );
+ }
+ }
+ }
+ }
+}
+
+// fn get_assert_args(snip: String) -> Option<Vec<String>> {
+//
+// }
+
+fn assert_with_message<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) -> Option<(LocalInternedString, bool)> {
+ if_chain! {
+ if let ExprKind::Match(ref expr, ref arms, MatchSource::IfDesugar { contains_else_clause: false }) = expr.kind;
+ // match expr
+ if let ExprKind::DropTemps(ref expr) = expr.kind;
+ if let ExprKind::Unary(UnOp::UnNot, ref expr) = expr.kind;
+ //if let ExprKind::Lit(ref lit) = expr.kind;
+ if let Some((Constant::Bool(is_true), _)) = constant(cx, cx.tables, expr);
+ //if is_true;
+ // match arms
+ // arm 1 pattern
+ if let PatKind::Lit(ref lit_expr) = arms[0].pat.kind;
+ if let ExprKind::Lit(ref lit) = lit_expr.kind;
+ if let LitKind::Bool(true) = lit.node;
+ //if let LitKind::Bool(true) = lit1.node;
+ // arm 1 block
+ if let ExprKind::Block(ref block1, _) = arms[0].body.kind;
+ if let Some(trailing_expr1) = &block1.expr;
+ if block1.stmts.len() == 0;
+ //
+ if let ExprKind::Block(ref actual_block1, _) = trailing_expr1.kind;
+ if let Some(block1_expr) = &actual_block1.expr;
+ // function call
+ if let ExprKind::Call(ref func, ref args) = block1_expr.kind;
+ if let ExprKind::Path(ref path) = func.kind;
+ // ["{{root}}", "std", "rt", "begin_panic"] does not work
+ if match_qpath(path, &["$crate", "rt", "begin_panic"]);
+ // arguments
+ if args.len() == 2;
+ if let ExprKind::Lit(ref lit) = args[0].kind;
+ if let LitKind::Str(ref s, _) = lit.node;
+ let panic_message = s.as_str(); // bind the panic message
+ if let ExprKind::AddrOf(MutImmutable, ref inner) = args[1].kind;
+ if let ExprKind::Tup(ref elements) = inner.kind;
+ if elements.len() == 3;
+ if let ExprKind::Lit(ref lit1) = elements[0].kind;
+ if let LitKind::Str(ref s1, _) = lit1.node;
+ if let ExprKind::Lit(ref lit2) = elements[1].kind;
+ if let LitKind::Int(_, _) = lit2.node;
+ if let ExprKind::Lit(ref lit3) = elements[2].kind;
+ if let LitKind::Int(_, _) = lit3.node;
+ // arm 2 block
+ if let PatKind::Wild = arms[1].pat.kind;
+ if let ExprKind::Block(ref block2, _) = arms[1].body.kind;
+ if let None = &block2.expr;
+ if block2.stmts.len() == 0;
+ then {
+ return Some((panic_message, is_true));
}
}
+ return None;
}
|
= help: remove it
-error: `assert!(false)` should probably be replaced
+error: `assert!(false, "false message")` should probably be replaced
--> $DIR/assertions_on_constants.rs:12:5
|
LL | assert!(false, "false message");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
- = help: use `panic!()` or `unreachable!()`
+ = help: use `panic!("false message")` or `unreachable!("false message")`
error: `assert!(true)` will be optimized out by the compiler
--> $DIR/assertions_on_constants.rs:15:5
|
= help: use `panic!()` or `unreachable!()`
+error: `assert!(false, "C message")` should probably be replaced
+ --> $DIR/assertions_on_constants.rs:19:5
+ |
+LL | assert!(C, "C message");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: use `panic!("C message")` or `unreachable!("C message")`
+
error: `assert!(true)` will be optimized out by the compiler
- --> $DIR/assertions_on_constants.rs:20:5
+ --> $DIR/assertions_on_constants.rs:21:5
|
LL | debug_assert!(true);
| ^^^^^^^^^^^^^^^^^^^^
= help: remove it
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
-error: aborting due to 7 previous errors
+error: aborting due to 8 previous errors