Ensure ASM syntax detect global_asm! and asm! only on x86 architectures

clippy_lints/src/asm_syntax.rs

@@ -2,8 +2,11 @@ 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_ast::{InlineAsm, Item, ItemKind};
+use rustc_lint::{EarlyContext, EarlyLintPass, Lint, LintContext};
 use rustc_session::declare_lint_pass;
+use rustc_span::Span;
+use rustc_target::asm::InlineAsmArch;
 
 #[derive(Clone, Copy, PartialEq, Eq)]
 enum AsmStyle {
@@ -31,8 +34,14 @@ impl std::ops::Not for AsmStyle {
     }
 }
 
-fn check_expr_asm_syntax(lint: &'static Lint, cx: &EarlyContext<'_>, expr: &Expr, check_for: AsmStyle) {
-    if let ExprKind::InlineAsm(ref inline_asm) = expr.kind {
+fn check_asm_syntax(
+    lint: &'static Lint,
+    cx: &EarlyContext<'_>,
+    inline_asm: &InlineAsm,
+    span: Span,
+    check_for: AsmStyle,
+) {
+    if matches!(cx.sess().asm_arch, Some(InlineAsmArch::X86 | InlineAsmArch::X86_64)) {
         let style = if inline_asm.options.contains(InlineAsmOptions::ATT_SYNTAX) {
             AsmStyle::Att
         } else {
@@ -43,7 +52,7 @@ fn check_expr_asm_syntax(lint: &'static Lint, cx: &EarlyContext<'_>, expr: &Expr
             span_lint_and_help(
                 cx,
                 lint,
-                expr.span,
+                span,
                 &format!("{style} x86 assembly syntax used"),
                 None,
                 &format!("use {} x86 assembly syntax", !style),
@@ -89,7 +98,15 @@ 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);
+        if let ExprKind::InlineAsm(inline_asm) = &expr.kind {
+            check_asm_syntax(Self::get_lints()[0], cx, inline_asm, expr.span, AsmStyle::Intel);
+        }
+    }
+
+    fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
+        if let ItemKind::GlobalAsm(inline_asm) = &item.kind {
+            check_asm_syntax(Self::get_lints()[0], cx, inline_asm, item.span, AsmStyle::Intel);
+        }
     }
 }
 
@@ -130,6 +147,14 @@ 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);
+        if let ExprKind::InlineAsm(inline_asm) = &expr.kind {
+            check_asm_syntax(Self::get_lints()[0], cx, inline_asm, expr.span, AsmStyle::Att);
+        }
+    }
+
+    fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
+        if let ItemKind::GlobalAsm(inline_asm) = &item.kind {
+            check_asm_syntax(Self::get_lints()[0], cx, inline_asm, item.span, AsmStyle::Att);
+        }
     }
 }

tests/ui/asm_syntax_not_x86.rs

@@ -0,0 +1,24 @@
+//@ignore-target-i686
+//@ignore-target-x86
+//@needs-asm-support
+
+#[warn(clippy::inline_asm_x86_intel_syntax)]
+#[warn(clippy::inline_asm_x86_att_syntax)]
+mod dont_warn {
+    use std::arch::{asm, global_asm};
+
+    pub(super) unsafe fn use_asm() {
+        asm!("");
+        asm!("", options());
+        asm!("", options(nostack));
+    }
+
+    global_asm!("");
+    global_asm!("", options());
+}
+
+fn main() {
+    unsafe {
+        dont_warn::use_asm();
+    }
+}

tests/ui/asm_syntax_x86.i686.stderr

@@ -0,0 +1,73 @@
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:10:9
+   |
+LL |         asm!("");
+   |         ^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: `-D clippy::inline-asm-x86-intel-syntax` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::inline_asm_x86_intel_syntax)]`
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:12:9
+   |
+LL |         asm!("", options());
+   |         ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:14:9
+   |
+LL |         asm!("", options(nostack));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:20:5
+   |
+LL |     global_asm!("");
+   |     ^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:22:5
+   |
+LL |     global_asm!("", options());
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:35:9
+   |
+LL |         asm!("", options(att_syntax));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+   = note: `-D clippy::inline-asm-x86-att-syntax` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::inline_asm_x86_att_syntax)]`
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:37:9
+   |
+LL |         asm!("", options(nostack, att_syntax));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:43:5
+   |
+LL |     global_asm!("", options(att_syntax));
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 8 previous errors
+

tests/ui/asm_syntax.rs → tests/ui/asm_syntax_x86.rs

@@ -1,10 +1,12 @@
-//@only-target-x86_64
-//@ignore-target-aarch64
+//@revisions: i686 x86_64
+//@[i686] only-target-i686
+//@[x86_64] only-target-x86_64
 
 #[warn(clippy::inline_asm_x86_intel_syntax)]
 mod warn_intel {
+    use std::arch::{asm, global_asm};
+
     pub(super) unsafe fn use_asm() {
-        use std::arch::asm;
         asm!("");
         //~^ ERROR: Intel x86 assembly syntax used
         asm!("", options());
@@ -14,12 +16,19 @@ mod warn_intel {
         asm!("", options(att_syntax));
         asm!("", options(nostack, att_syntax));
     }
+
+    global_asm!("");
+    //~^ ERROR: Intel x86 assembly syntax used
+    global_asm!("", options());
+    //~^ ERROR: Intel x86 assembly syntax used
+    global_asm!("", options(att_syntax));
 }
 
 #[warn(clippy::inline_asm_x86_att_syntax)]
 mod warn_att {
+    use std::arch::{asm, global_asm};
+
     pub(super) unsafe fn use_asm() {
-        use std::arch::asm;
         asm!("");
         asm!("", options());
         asm!("", options(nostack));
@@ -28,9 +37,13 @@ mod warn_att {
         asm!("", options(nostack, att_syntax));
         //~^ ERROR: AT&T x86 assembly syntax used
     }
+
+    global_asm!("");
+    global_asm!("", options());
+    global_asm!("", options(att_syntax));
+    //~^ ERROR: AT&T x86 assembly syntax used
 }
 
-#[cfg(target_arch = "x86_64")]
 fn main() {
     unsafe {
         warn_att::use_asm();

tests/ui/asm_syntax_x86.x86_64.stderr

@@ -0,0 +1,73 @@
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:10:9
+   |
+LL |         asm!("");
+   |         ^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: `-D clippy::inline-asm-x86-intel-syntax` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::inline_asm_x86_intel_syntax)]`
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:12:9
+   |
+LL |         asm!("", options());
+   |         ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:14:9
+   |
+LL |         asm!("", options(nostack));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:20:5
+   |
+LL |     global_asm!("");
+   |     ^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: Intel x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:22:5
+   |
+LL |     global_asm!("", options());
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use AT&T x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:35:9
+   |
+LL |         asm!("", options(att_syntax));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+   = note: `-D clippy::inline-asm-x86-att-syntax` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::inline_asm_x86_att_syntax)]`
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:37:9
+   |
+LL |         asm!("", options(nostack, att_syntax));
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+
+error: AT&T x86 assembly syntax used
+  --> $DIR/asm_syntax_x86.rs:43:5
+   |
+LL |     global_asm!("", options(att_syntax));
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: use Intel x86 assembly syntax
+   = note: this error originates in the macro `global_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 8 previous errors
+