4 use rustc_ast::tokenstream::TokenStream;
5 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
6 use rustc_errors::{Applicability, DiagnosticBuilder};
7 use rustc_expand::base::{self, *};
8 use rustc_parse::parser::Parser;
9 use rustc_parse_format as parse;
10 use rustc_session::lint::{self, BuiltinLintDiagnostics};
11 use rustc_span::symbol::Ident;
12 use rustc_span::symbol::{kw, sym, Symbol};
13 use rustc_span::{InnerSpan, MultiSpan, Span};
14 use rustc_target::asm::InlineAsmArch;
15 use smallvec::smallvec;
18 templates: Vec<P<ast::Expr>>,
19 operands: Vec<(ast::InlineAsmOperand, Span)>,
20 named_args: FxHashMap<Symbol, usize>,
21 reg_args: FxHashSet<usize>,
22 clobber_abi: Option<(Symbol, Span)>,
23 options: ast::InlineAsmOptions,
24 options_spans: Vec<Span>,
28 ecx: &mut ExtCtxt<'a>,
32 ) -> Result<AsmArgs, DiagnosticBuilder<'a>> {
33 let mut p = ecx.new_parser_from_tts(tts);
35 if p.token == token::Eof {
36 return Err(ecx.struct_span_err(sp, "requires at least a template string argument"));
39 // Detect use of the legacy llvm_asm! syntax (which used to be called asm!)
40 if !is_global_asm && p.look_ahead(1, |t| *t == token::Colon || *t == token::ModSep) {
42 ecx.struct_span_err(sp, "the legacy LLVM-style asm! syntax is no longer supported");
43 err.note("consider migrating to the new asm! syntax specified in RFC 2873");
44 err.note("alternatively, switch to llvm_asm! to keep your code working as it is");
46 // Find the span of the "asm!" so that we can offer an automatic suggestion
47 let asm_span = sp.from_inner(InnerSpan::new(0, 4));
48 if let Ok(s) = ecx.source_map().span_to_snippet(asm_span) {
54 Applicability::MachineApplicable,
61 let first_template = p.parse_expr()?;
62 let mut args = AsmArgs {
63 templates: vec![first_template],
65 named_args: FxHashMap::default(),
66 reg_args: FxHashSet::default(),
68 options: ast::InlineAsmOptions::empty(),
69 options_spans: vec![],
72 let mut allow_templates = true;
73 while p.token != token::Eof {
74 if !p.eat(&token::Comma) {
76 // After a template string, we always expect *only* a comma...
77 let mut err = ecx.struct_span_err(p.token.span, "expected token: `,`");
78 err.span_label(p.token.span, "expected `,`");
79 p.maybe_annotate_with_ascription(&mut err, false);
82 // ...after that delegate to `expect` to also include the other expected tokens.
83 return Err(p.expect(&token::Comma).err().unwrap());
86 if p.token == token::Eof {
88 } // accept trailing commas
91 if p.eat_keyword(sym::clobber_abi) {
92 parse_clobber_abi(&mut p, &mut args)?;
93 allow_templates = false;
98 if p.eat_keyword(sym::options) {
99 parse_options(&mut p, &mut args, is_global_asm)?;
100 allow_templates = false;
104 let span_start = p.token.span;
106 // Parse operand names
107 let name = if p.token.is_ident() && p.look_ahead(1, |t| *t == token::Eq) {
108 let (ident, _) = p.token.ident().unwrap();
110 p.expect(&token::Eq)?;
111 allow_templates = false;
117 let mut explicit_reg = false;
118 let op = if !is_global_asm && p.eat_keyword(kw::In) {
119 let reg = parse_reg(&mut p, &mut explicit_reg)?;
120 let expr = p.parse_expr()?;
121 ast::InlineAsmOperand::In { reg, expr }
122 } else if !is_global_asm && p.eat_keyword(sym::out) {
123 let reg = parse_reg(&mut p, &mut explicit_reg)?;
124 let expr = if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
125 ast::InlineAsmOperand::Out { reg, expr, late: false }
126 } else if !is_global_asm && p.eat_keyword(sym::lateout) {
127 let reg = parse_reg(&mut p, &mut explicit_reg)?;
128 let expr = if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
129 ast::InlineAsmOperand::Out { reg, expr, late: true }
130 } else if !is_global_asm && p.eat_keyword(sym::inout) {
131 let reg = parse_reg(&mut p, &mut explicit_reg)?;
132 let expr = p.parse_expr()?;
133 if p.eat(&token::FatArrow) {
135 if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
136 ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: false }
138 ast::InlineAsmOperand::InOut { reg, expr, late: false }
140 } else if !is_global_asm && p.eat_keyword(sym::inlateout) {
141 let reg = parse_reg(&mut p, &mut explicit_reg)?;
142 let expr = p.parse_expr()?;
143 if p.eat(&token::FatArrow) {
145 if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
146 ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: true }
148 ast::InlineAsmOperand::InOut { reg, expr, late: true }
150 } else if p.eat_keyword(kw::Const) {
151 let anon_const = p.parse_anon_const_expr()?;
152 ast::InlineAsmOperand::Const { anon_const }
153 } else if !is_global_asm && p.eat_keyword(sym::sym) {
154 let expr = p.parse_expr()?;
156 ast::ExprKind::Path(..) => {}
159 .struct_span_err(expr.span, "argument to `sym` must be a path expression");
163 ast::InlineAsmOperand::Sym { expr }
164 } else if allow_templates {
165 let template = p.parse_expr()?;
166 // If it can't possibly expand to a string, provide diagnostics here to include other
167 // things it could have been.
168 match template.kind {
169 ast::ExprKind::Lit(ast::Lit { kind: ast::LitKind::Str(..), .. }) => {}
170 ast::ExprKind::MacCall(..) => {}
172 let errstr = if is_global_asm {
173 "expected operand, options, or additional template string"
175 "expected operand, clobber_abi, options, or additional template string"
177 let mut err = ecx.struct_span_err(template.span, errstr);
178 err.span_label(template.span, errstr);
182 args.templates.push(template);
185 return p.unexpected();
188 allow_templates = false;
189 let span = span_start.to(p.prev_token.span);
190 let slot = args.operands.len();
191 args.operands.push((op, span));
193 // Validate the order of named, positional & explicit register operands and
194 // clobber_abi/options. We do this at the end once we have the full span
195 // of the argument available.
196 if !args.options_spans.is_empty() {
197 ecx.struct_span_err(span, "arguments are not allowed after options")
198 .span_labels(args.options_spans.clone(), "previous options")
199 .span_label(span, "argument")
201 } else if let Some((_, abi_span)) = args.clobber_abi {
202 ecx.struct_span_err(span, "arguments are not allowed after clobber_abi")
203 .span_label(abi_span, "clobber_abi")
204 .span_label(span, "argument")
209 ecx.struct_span_err(span, "explicit register arguments cannot have names").emit();
211 args.reg_args.insert(slot);
212 } else if let Some(name) = name {
213 if let Some(&prev) = args.named_args.get(&name) {
214 ecx.struct_span_err(span, &format!("duplicate argument named `{}`", name))
215 .span_label(args.operands[prev].1, "previously here")
216 .span_label(span, "duplicate argument")
220 if !args.reg_args.is_empty() {
221 let mut err = ecx.struct_span_err(
223 "named arguments cannot follow explicit register arguments",
225 err.span_label(span, "named argument");
226 for pos in &args.reg_args {
227 err.span_label(args.operands[*pos].1, "explicit register argument");
231 args.named_args.insert(name, slot);
233 if !args.named_args.is_empty() || !args.reg_args.is_empty() {
234 let mut err = ecx.struct_span_err(
236 "positional arguments cannot follow named arguments \
237 or explicit register arguments",
239 err.span_label(span, "positional argument");
240 for pos in args.named_args.values() {
241 err.span_label(args.operands[*pos].1, "named argument");
243 for pos in &args.reg_args {
244 err.span_label(args.operands[*pos].1, "explicit register argument");
251 if args.options.contains(ast::InlineAsmOptions::NOMEM)
252 && args.options.contains(ast::InlineAsmOptions::READONLY)
254 let spans = args.options_spans.clone();
255 ecx.struct_span_err(spans, "the `nomem` and `readonly` options are mutually exclusive")
258 if args.options.contains(ast::InlineAsmOptions::PURE)
259 && args.options.contains(ast::InlineAsmOptions::NORETURN)
261 let spans = args.options_spans.clone();
262 ecx.struct_span_err(spans, "the `pure` and `noreturn` options are mutually exclusive")
265 if args.options.contains(ast::InlineAsmOptions::PURE)
266 && !args.options.intersects(ast::InlineAsmOptions::NOMEM | ast::InlineAsmOptions::READONLY)
268 let spans = args.options_spans.clone();
271 "the `pure` option must be combined with either `nomem` or `readonly`",
276 let mut have_real_output = false;
277 let mut outputs_sp = vec![];
278 let mut regclass_outputs = vec![];
279 for (op, op_sp) in &args.operands {
281 ast::InlineAsmOperand::Out { reg, expr, .. }
282 | ast::InlineAsmOperand::SplitInOut { reg, out_expr: expr, .. } => {
283 outputs_sp.push(*op_sp);
284 have_real_output |= expr.is_some();
285 if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg {
286 regclass_outputs.push(*op_sp);
289 ast::InlineAsmOperand::InOut { reg, .. } => {
290 outputs_sp.push(*op_sp);
291 have_real_output = true;
292 if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg {
293 regclass_outputs.push(*op_sp);
299 if args.options.contains(ast::InlineAsmOptions::PURE) && !have_real_output {
301 args.options_spans.clone(),
302 "asm with the `pure` option must have at least one output",
306 if args.options.contains(ast::InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() {
308 .struct_span_err(outputs_sp, "asm outputs are not allowed with the `noreturn` option");
310 // Bail out now since this is likely to confuse MIR
313 if let Some((_, abi_span)) = args.clobber_abi {
316 ecx.struct_span_err(abi_span, "`clobber_abi` cannot be used with `global_asm!`");
318 // Bail out now since this is likely to confuse later stages
321 if !regclass_outputs.is_empty() {
323 regclass_outputs.clone(),
324 "asm with `clobber_abi` must specify explicit registers for outputs",
326 .span_label(abi_span, "clobber_abi")
327 .span_labels(regclass_outputs, "generic outputs")
335 /// Report a duplicate option error.
337 /// This function must be called immediately after the option token is parsed.
338 /// Otherwise, the suggestion will be incorrect.
339 fn err_duplicate_option<'a>(p: &mut Parser<'a>, symbol: Symbol, span: Span) {
343 .struct_span_err(span, &format!("the `{}` option was already provided", symbol));
344 err.span_label(span, "this option was already provided");
347 let mut full_span = span;
348 if p.token.kind == token::Comma {
349 full_span = full_span.to(p.token.span);
351 err.tool_only_span_suggestion(
353 "remove this option",
355 Applicability::MachineApplicable,
361 /// Try to set the provided option in the provided `AsmArgs`.
362 /// If it is already set, report a duplicate option error.
364 /// This function must be called immediately after the option token is parsed.
365 /// Otherwise, the error will not point to the correct spot.
366 fn try_set_option<'a>(
370 option: ast::InlineAsmOptions,
372 if !args.options.contains(option) {
373 args.options |= option;
375 err_duplicate_option(p, symbol, p.prev_token.span);
379 fn parse_options<'a>(
383 ) -> Result<(), DiagnosticBuilder<'a>> {
384 let span_start = p.prev_token.span;
386 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
388 while !p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
389 if !is_global_asm && p.eat_keyword(sym::pure) {
390 try_set_option(p, args, sym::pure, ast::InlineAsmOptions::PURE);
391 } else if !is_global_asm && p.eat_keyword(sym::nomem) {
392 try_set_option(p, args, sym::nomem, ast::InlineAsmOptions::NOMEM);
393 } else if !is_global_asm && p.eat_keyword(sym::readonly) {
394 try_set_option(p, args, sym::readonly, ast::InlineAsmOptions::READONLY);
395 } else if !is_global_asm && p.eat_keyword(sym::preserves_flags) {
396 try_set_option(p, args, sym::preserves_flags, ast::InlineAsmOptions::PRESERVES_FLAGS);
397 } else if !is_global_asm && p.eat_keyword(sym::noreturn) {
398 try_set_option(p, args, sym::noreturn, ast::InlineAsmOptions::NORETURN);
399 } else if !is_global_asm && p.eat_keyword(sym::nostack) {
400 try_set_option(p, args, sym::nostack, ast::InlineAsmOptions::NOSTACK);
401 } else if p.eat_keyword(sym::att_syntax) {
402 try_set_option(p, args, sym::att_syntax, ast::InlineAsmOptions::ATT_SYNTAX);
403 } else if p.eat_keyword(kw::Raw) {
404 try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::RAW);
406 return p.unexpected();
409 // Allow trailing commas
410 if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
413 p.expect(&token::Comma)?;
416 let new_span = span_start.to(p.prev_token.span);
417 args.options_spans.push(new_span);
422 fn parse_clobber_abi<'a>(
425 ) -> Result<(), DiagnosticBuilder<'a>> {
426 let span_start = p.prev_token.span;
428 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
430 let clobber_abi = match p.parse_str_lit() {
431 Ok(str_lit) => str_lit.symbol_unescaped,
433 let span = opt_lit.map_or(p.token.span, |lit| lit.span);
434 let mut err = p.sess.span_diagnostic.struct_span_err(span, "expected string literal");
435 err.span_label(span, "not a string literal");
440 p.expect(&token::CloseDelim(token::DelimToken::Paren))?;
442 let new_span = span_start.to(p.prev_token.span);
444 if let Some((_, prev_span)) = args.clobber_abi {
448 .struct_span_err(new_span, "clobber_abi specified multiple times");
449 err.span_label(prev_span, "clobber_abi previously specified here");
451 } else if !args.options_spans.is_empty() {
455 .struct_span_err(new_span, "clobber_abi is not allowed after options");
456 err.span_labels(args.options_spans.clone(), "options");
460 args.clobber_abi = Some((clobber_abi, new_span));
467 explicit_reg: &mut bool,
468 ) -> Result<ast::InlineAsmRegOrRegClass, DiagnosticBuilder<'a>> {
469 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
470 let result = match p.token.uninterpolate().kind {
471 token::Ident(name, false) => ast::InlineAsmRegOrRegClass::RegClass(name),
472 token::Literal(token::Lit { kind: token::LitKind::Str, symbol, suffix: _ }) => {
473 *explicit_reg = true;
474 ast::InlineAsmRegOrRegClass::Reg(symbol)
478 p.struct_span_err(p.token.span, "expected register class or explicit register")
483 p.expect(&token::CloseDelim(token::DelimToken::Paren))?;
487 fn expand_preparsed_asm(
488 ecx: &mut ExtCtxt<'_>,
491 ) -> Option<ast::InlineAsm> {
492 let mut template = vec![];
493 // Register operands are implicitly used since they are not allowed to be
494 // referenced in the template string.
495 let mut used = vec![false; args.operands.len()];
496 for pos in &args.reg_args {
499 let named_pos: FxHashMap<usize, Symbol> =
500 args.named_args.iter().map(|(&sym, &idx)| (idx, sym)).collect();
501 let mut line_spans = Vec::with_capacity(args.templates.len());
504 for template_expr in args.templates.into_iter() {
505 if !template.is_empty() {
506 template.push(ast::InlineAsmTemplatePiece::String("\n".to_string()));
509 let msg = "asm template must be a string literal";
510 let template_sp = template_expr.span;
511 let (template_str, template_style, template_span) =
512 match expr_to_spanned_string(ecx, template_expr, msg) {
513 Ok(template_part) => template_part,
515 if let Some(mut err) = err {
522 let str_style = match template_style {
523 ast::StrStyle::Cooked => None,
524 ast::StrStyle::Raw(raw) => Some(raw as usize),
527 let template_str = &template_str.as_str();
528 let template_snippet = ecx.source_map().span_to_snippet(template_sp).ok();
530 if let Some(InlineAsmArch::X86 | InlineAsmArch::X86_64) = ecx.sess.asm_arch {
531 let find_span = |needle: &str| -> Span {
532 if let Some(snippet) = &template_snippet {
533 if let Some(pos) = snippet.find(needle) {
536 .find(|c| matches!(c, '\n' | ';' | '\\' | '"'))
537 .unwrap_or(snippet[pos..].len() - 1);
538 let inner = InnerSpan::new(pos, end);
539 return template_sp.from_inner(inner);
545 if template_str.contains(".intel_syntax") {
546 ecx.parse_sess().buffer_lint(
547 lint::builtin::BAD_ASM_STYLE,
548 find_span(".intel_syntax"),
549 ecx.current_expansion.lint_node_id,
550 "avoid using `.intel_syntax`, Intel syntax is the default",
553 if template_str.contains(".att_syntax") {
554 ecx.parse_sess().buffer_lint(
555 lint::builtin::BAD_ASM_STYLE,
556 find_span(".att_syntax"),
557 ecx.current_expansion.lint_node_id,
558 "avoid using `.att_syntax`, prefer using `options(att_syntax)` instead",
563 // Lint against the use of named labels in inline `asm!` but not `global_asm!`
565 let find_label_span = |needle: &str| -> Option<Span> {
566 if let Some(snippet) = &template_snippet {
567 if let Some(pos) = snippet.find(needle) {
571 .unwrap_or(snippet[pos..].len() - 1);
572 let inner = InnerSpan::new(pos, end);
573 return Some(template_sp.from_inner(inner));
580 let mut found_labels = Vec::new();
582 // A semicolon might not actually be specified as a separator for all targets, but it seems like LLVM accepts it always
583 let statements = template_str.split(|c| matches!(c, '\n' | ';'));
584 for statement in statements {
585 // If there's a comment, trim it from the statement
586 let statement = statement.find("//").map_or(statement, |idx| &statement[..idx]);
587 let mut start_idx = 0;
588 for (idx, _) in statement.match_indices(':') {
589 let possible_label = statement[start_idx..idx].trim();
590 let mut chars = possible_label.chars();
591 if let Some(c) = chars.next() {
592 // A label starts with an alphabetic character or . or _ and continues with alphanumeric characters, _, or $
593 if (c.is_alphabetic() || matches!(c, '.' | '_'))
594 && chars.all(|c| c.is_alphanumeric() || matches!(c, '_' | '$'))
596 found_labels.push(possible_label);
598 // If we encounter a non-label, there cannot be any further labels, so stop checking
602 // Empty string means a leading ':' in this section, which is not a label
610 if found_labels.len() > 0 {
612 found_labels.into_iter().filter_map(find_label_span).collect::<Vec<Span>>();
613 // If there were labels but we couldn't find a span, combine the warnings and use the template span
614 let target_spans: MultiSpan =
615 if spans.len() > 0 { spans.into() } else { template_sp.into() };
616 ecx.parse_sess().buffer_lint_with_diagnostic(
617 lint::builtin::NAMED_ASM_LABELS,
619 ecx.current_expansion.lint_node_id,
620 "avoid using named labels in inline assembly",
621 BuiltinLintDiagnostics::NamedAsmLabel(
622 "only local labels of the form `<number>:` should be used in inline asm"
629 // Don't treat raw asm as a format string.
630 if args.options.contains(ast::InlineAsmOptions::RAW) {
631 template.push(ast::InlineAsmTemplatePiece::String(template_str.to_string()));
632 let template_num_lines = 1 + template_str.matches('\n').count();
633 line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines));
637 let mut parser = parse::Parser::new(
642 parse::ParseMode::InlineAsm,
644 parser.curarg = curarg;
646 let mut unverified_pieces = Vec::new();
647 while let Some(piece) = parser.next() {
648 if !parser.errors.is_empty() {
651 unverified_pieces.push(piece);
655 if !parser.errors.is_empty() {
656 let err = parser.errors.remove(0);
657 let err_sp = template_span.from_inner(err.span);
658 let msg = &format!("invalid asm template string: {}", err.description);
659 let mut e = ecx.struct_span_err(err_sp, msg);
660 e.span_label(err_sp, err.label + " in asm template string");
661 if let Some(note) = err.note {
664 if let Some((label, span)) = err.secondary_label {
665 let err_sp = template_span.from_inner(span);
666 e.span_label(err_sp, label);
672 curarg = parser.curarg;
674 let mut arg_spans = parser.arg_places.iter().map(|span| template_span.from_inner(*span));
675 for piece in unverified_pieces {
677 parse::Piece::String(s) => {
678 template.push(ast::InlineAsmTemplatePiece::String(s.to_string()))
680 parse::Piece::NextArgument(arg) => {
681 let span = arg_spans.next().unwrap_or(template_sp);
683 let operand_idx = match arg.position {
684 parse::ArgumentIs(idx) | parse::ArgumentImplicitlyIs(idx) => {
685 if idx >= args.operands.len()
686 || named_pos.contains_key(&idx)
687 || args.reg_args.contains(&idx)
689 let msg = format!("invalid reference to argument at index {}", idx);
690 let mut err = ecx.struct_span_err(span, &msg);
691 err.span_label(span, "from here");
693 let positional_args = args.operands.len()
694 - args.named_args.len()
695 - args.reg_args.len();
696 let positional = if positional_args != args.operands.len() {
701 let msg = match positional_args {
702 0 => format!("no {}arguments were given", positional),
703 1 => format!("there is 1 {}argument", positional),
704 x => format!("there are {} {}arguments", x, positional),
708 if named_pos.contains_key(&idx) {
709 err.span_label(args.operands[idx].1, "named argument");
711 args.operands[idx].1,
712 "named arguments cannot be referenced by position",
714 } else if args.reg_args.contains(&idx) {
716 args.operands[idx].1,
717 "explicit register argument",
720 args.operands[idx].1,
721 "explicit register arguments cannot be used in the asm template",
730 parse::ArgumentNamed(name) => match args.named_args.get(&name) {
731 Some(&idx) => Some(idx),
733 let msg = format!("there is no argument named `{}`", name);
734 ecx.struct_span_err(span, &msg[..]).emit();
740 let mut chars = arg.format.ty.chars();
741 let mut modifier = chars.next();
742 if chars.next().is_some() {
746 .map(|sp| template_sp.from_inner(sp))
747 .unwrap_or(template_sp);
750 "asm template modifier must be a single character",
756 if let Some(operand_idx) = operand_idx {
757 used[operand_idx] = true;
758 template.push(ast::InlineAsmTemplatePiece::Placeholder {
768 if parser.line_spans.is_empty() {
769 let template_num_lines = 1 + template_str.matches('\n').count();
770 line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines));
772 line_spans.extend(parser.line_spans.iter().map(|span| template_span.from_inner(*span)));
776 let mut unused_operands = vec![];
777 let mut help_str = String::new();
778 for (idx, used) in used.into_iter().enumerate() {
780 let msg = if let Some(sym) = named_pos.get(&idx) {
781 help_str.push_str(&format!(" {{{}}}", sym));
782 "named argument never used"
784 help_str.push_str(&format!(" {{{}}}", idx));
785 "argument never used"
787 unused_operands.push((args.operands[idx].1, msg));
790 match unused_operands.len() {
793 let (sp, msg) = unused_operands.into_iter().next().unwrap();
794 let mut err = ecx.struct_span_err(sp, msg);
795 err.span_label(sp, msg);
797 "if this argument is intentionally unused, \
798 consider using it in an asm comment: `\"/*{} */\"`",
804 let mut err = ecx.struct_span_err(
805 unused_operands.iter().map(|&(sp, _)| sp).collect::<Vec<Span>>(),
806 "multiple unused asm arguments",
808 for (sp, msg) in unused_operands {
809 err.span_label(sp, msg);
812 "if these arguments are intentionally unused, \
813 consider using them in an asm comment: `\"/*{} */\"`",
820 Some(ast::InlineAsm {
822 operands: args.operands,
823 clobber_abi: args.clobber_abi,
824 options: args.options,
829 pub fn expand_asm<'cx>(
830 ecx: &'cx mut ExtCtxt<'_>,
833 ) -> Box<dyn base::MacResult + 'cx> {
834 match parse_args(ecx, sp, tts, false) {
836 let expr = if let Some(inline_asm) = expand_preparsed_asm(ecx, args, true) {
838 id: ast::DUMMY_NODE_ID,
839 kind: ast::ExprKind::InlineAsm(P(inline_asm)),
841 attrs: ast::AttrVec::new(),
845 DummyResult::raw_expr(sp, true)
856 pub fn expand_global_asm<'cx>(
857 ecx: &'cx mut ExtCtxt<'_>,
860 ) -> Box<dyn base::MacResult + 'cx> {
861 match parse_args(ecx, sp, tts, true) {
863 if let Some(inline_asm) = expand_preparsed_asm(ecx, args, false) {
864 MacEager::items(smallvec![P(ast::Item {
865 ident: Ident::invalid(),
867 id: ast::DUMMY_NODE_ID,
868 kind: ast::ItemKind::GlobalAsm(inline_asm),
869 vis: ast::Visibility {
870 span: sp.shrink_to_lo(),
871 kind: ast::VisibilityKind::Inherited,
874 span: ecx.with_def_site_ctxt(sp),