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|
use std::fmt;
use clippy_utils::diagnostics::span_lint_and_help;
use rustc_ast::ast::{Expr, ExprKind, InlineAsmOptions};
use rustc_lint::{EarlyContext, EarlyLintPass, Lint};
use rustc_session::{declare_lint_pass, declare_tool_lint};
#[derive(Clone, Copy, PartialEq, Eq)]
enum AsmStyle {
Intel,
Att,
}
impl fmt::Display for AsmStyle {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
AsmStyle::Intel => f.write_str("Intel"),
AsmStyle::Att => f.write_str("AT&T"),
}
}
}
impl std::ops::Not for AsmStyle {
type Output = AsmStyle;
fn not(self) -> AsmStyle {
match self {
AsmStyle::Intel => AsmStyle::Att,
AsmStyle::Att => AsmStyle::Intel,
}
}
}
fn check_expr_asm_syntax(lint: &'static Lint, cx: &EarlyContext<'_>, expr: &Expr, check_for: AsmStyle) {
if let ExprKind::InlineAsm(ref inline_asm) = expr.kind {
let style = if inline_asm.options.contains(InlineAsmOptions::ATT_SYNTAX) {
AsmStyle::Att
} else {
AsmStyle::Intel
};
if style == check_for {
span_lint_and_help(
cx,
lint,
expr.span,
&format!("{} x86 assembly syntax used", style),
None,
&format!("use {} x86 assembly syntax", !style),
);
}
}
}
declare_clippy_lint! {
/// **What it does:** Checks for usage of Intel x86 assembly syntax.
///
/// **Why is this bad?** The lint has been enabled to indicate a preference
/// for AT&T x86 assembly syntax.
///
/// **Known problems:** None.
///
/// **Example:**
///
/// ```rust,no_run
/// # #![feature(asm)]
/// # unsafe { let ptr = "".as_ptr();
/// asm!("lea {}, [{}]", lateout(reg) _, in(reg) ptr);
/// # }
/// ```
/// Use instead:
/// ```rust,no_run
/// # #![feature(asm)]
/// # unsafe { let ptr = "".as_ptr();
/// asm!("lea ({}), {}", in(reg) ptr, lateout(reg) _, options(att_syntax));
/// # }
/// ```
pub INLINE_ASM_X86_INTEL_SYNTAX,
restriction,
"prefer AT&T x86 assembly syntax"
}
declare_lint_pass!(InlineAsmX86IntelSyntax => [INLINE_ASM_X86_INTEL_SYNTAX]);
impl EarlyLintPass for InlineAsmX86IntelSyntax {
fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
check_expr_asm_syntax(Self::get_lints()[0], cx, expr, AsmStyle::Intel);
}
}
declare_clippy_lint! {
/// **What it does:** Checks for usage of AT&T x86 assembly syntax.
///
/// **Why is this bad?** The lint has been enabled to indicate a preference
/// for Intel x86 assembly syntax.
///
/// **Known problems:** None.
///
/// **Example:**
///
/// ```rust,no_run
/// # #![feature(asm)]
/// # unsafe { let ptr = "".as_ptr();
/// asm!("lea ({}), {}", in(reg) ptr, lateout(reg) _, options(att_syntax));
/// # }
/// ```
/// Use instead:
/// ```rust,no_run
/// # #![feature(asm)]
/// # unsafe { let ptr = "".as_ptr();
/// asm!("lea {}, [{}]", lateout(reg) _, in(reg) ptr);
/// # }
/// ```
pub INLINE_ASM_X86_ATT_SYNTAX,
restriction,
"prefer Intel x86 assembly syntax"
}
declare_lint_pass!(InlineAsmX86AttSyntax => [INLINE_ASM_X86_ATT_SYNTAX]);
impl EarlyLintPass for InlineAsmX86AttSyntax {
fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
check_expr_asm_syntax(Self::get_lints()[0], cx, expr, AsmStyle::Att);
}
}
|
