4 use rustc_ast::tokenstream::TokenStream;
5 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
6 use rustc_errors::{Applicability, PResult};
7 use rustc_expand::base::{self, *};
8 use rustc_parse::parser::Parser;
9 use rustc_parse_format as parse;
10 use rustc_session::lint;
11 use rustc_session::parse::ParseSess;
12 use rustc_span::symbol::Ident;
13 use rustc_span::symbol::{kw, sym, Symbol};
14 use rustc_span::{InnerSpan, Span};
15 use rustc_target::asm::InlineAsmArch;
16 use smallvec::smallvec;
19 pub templates: Vec<P<ast::Expr>>,
20 pub operands: Vec<(ast::InlineAsmOperand, Span)>,
21 named_args: FxHashMap<Symbol, usize>,
22 reg_args: FxHashSet<usize>,
23 pub clobber_abis: Vec<(Symbol, Span)>,
24 options: ast::InlineAsmOptions,
25 pub options_spans: Vec<Span>,
29 ecx: &mut ExtCtxt<'a>,
33 ) -> PResult<'a, AsmArgs> {
34 let mut p = ecx.new_parser_from_tts(tts);
35 let sess = &ecx.sess.parse_sess;
36 parse_asm_args(&mut p, sess, sp, is_global_asm)
39 // Primarily public for rustfmt consumption.
40 // Internal consumers should continue to leverage `expand_asm`/`expand__global_asm`
41 pub fn parse_asm_args<'a>(
46 ) -> PResult<'a, AsmArgs> {
47 let diag = &sess.span_diagnostic;
49 if p.token == token::Eof {
50 return Err(diag.struct_span_err(sp, "requires at least a template string argument"));
53 let first_template = p.parse_expr()?;
54 let mut args = AsmArgs {
55 templates: vec![first_template],
57 named_args: FxHashMap::default(),
58 reg_args: FxHashSet::default(),
59 clobber_abis: Vec::new(),
60 options: ast::InlineAsmOptions::empty(),
61 options_spans: vec![],
64 let mut allow_templates = true;
65 while p.token != token::Eof {
66 if !p.eat(&token::Comma) {
68 // After a template string, we always expect *only* a comma...
69 let mut err = diag.struct_span_err(p.token.span, "expected token: `,`");
70 err.span_label(p.token.span, "expected `,`");
71 p.maybe_annotate_with_ascription(&mut err, false);
74 // ...after that delegate to `expect` to also include the other expected tokens.
75 return Err(p.expect(&token::Comma).err().unwrap());
78 if p.token == token::Eof {
80 } // accept trailing commas
83 if p.eat_keyword(sym::clobber_abi) {
84 parse_clobber_abi(p, &mut args)?;
85 allow_templates = false;
90 if p.eat_keyword(sym::options) {
91 parse_options(p, &mut args, is_global_asm)?;
92 allow_templates = false;
96 let span_start = p.token.span;
98 // Parse operand names
99 let name = if p.token.is_ident() && p.look_ahead(1, |t| *t == token::Eq) {
100 let (ident, _) = p.token.ident().unwrap();
102 p.expect(&token::Eq)?;
103 allow_templates = false;
109 let mut explicit_reg = false;
110 let op = if !is_global_asm && p.eat_keyword(kw::In) {
111 let reg = parse_reg(p, &mut explicit_reg)?;
112 if p.eat_keyword(kw::Underscore) {
113 let err = diag.struct_span_err(p.token.span, "_ cannot be used for input operands");
116 let expr = p.parse_expr()?;
117 ast::InlineAsmOperand::In { reg, expr }
118 } else if !is_global_asm && p.eat_keyword(sym::out) {
119 let reg = parse_reg(p, &mut explicit_reg)?;
120 let expr = if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
121 ast::InlineAsmOperand::Out { reg, expr, late: false }
122 } else if !is_global_asm && p.eat_keyword(sym::lateout) {
123 let reg = parse_reg(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: true }
126 } else if !is_global_asm && p.eat_keyword(sym::inout) {
127 let reg = parse_reg(p, &mut explicit_reg)?;
128 if p.eat_keyword(kw::Underscore) {
129 let err = diag.struct_span_err(p.token.span, "_ cannot be used for input operands");
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(p, &mut explicit_reg)?;
142 if p.eat_keyword(kw::Underscore) {
143 let err = diag.struct_span_err(p.token.span, "_ cannot be used for input operands");
146 let expr = p.parse_expr()?;
147 if p.eat(&token::FatArrow) {
149 if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) };
150 ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: true }
152 ast::InlineAsmOperand::InOut { reg, expr, late: true }
154 } else if p.eat_keyword(kw::Const) {
155 let anon_const = p.parse_anon_const_expr()?;
156 ast::InlineAsmOperand::Const { anon_const }
157 } else if !is_global_asm && p.eat_keyword(sym::sym) {
158 let expr = p.parse_expr()?;
160 ast::ExprKind::Path(..) => {}
163 .struct_span_err(expr.span, "argument to `sym` must be a path expression");
167 ast::InlineAsmOperand::Sym { expr }
168 } else if allow_templates {
169 let template = p.parse_expr()?;
170 // If it can't possibly expand to a string, provide diagnostics here to include other
171 // things it could have been.
172 match template.kind {
173 ast::ExprKind::Lit(ast::Lit { kind: ast::LitKind::Str(..), .. }) => {}
174 ast::ExprKind::MacCall(..) => {}
176 let errstr = if is_global_asm {
177 "expected operand, options, or additional template string"
179 "expected operand, clobber_abi, options, or additional template string"
181 let mut err = diag.struct_span_err(template.span, errstr);
182 err.span_label(template.span, errstr);
186 args.templates.push(template);
189 return p.unexpected();
192 allow_templates = false;
193 let span = span_start.to(p.prev_token.span);
194 let slot = args.operands.len();
195 args.operands.push((op, span));
197 // Validate the order of named, positional & explicit register operands and
198 // clobber_abi/options. We do this at the end once we have the full span
199 // of the argument available.
200 if !args.options_spans.is_empty() {
201 diag.struct_span_err(span, "arguments are not allowed after options")
202 .span_labels(args.options_spans.clone(), "previous options")
203 .span_label(span, "argument")
205 } else if let Some((_, abi_span)) = args.clobber_abis.last() {
206 diag.struct_span_err(span, "arguments are not allowed after clobber_abi")
207 .span_label(*abi_span, "clobber_abi")
208 .span_label(span, "argument")
213 diag.struct_span_err(span, "explicit register arguments cannot have names").emit();
215 args.reg_args.insert(slot);
216 } else if let Some(name) = name {
217 if let Some(&prev) = args.named_args.get(&name) {
218 diag.struct_span_err(span, &format!("duplicate argument named `{}`", name))
219 .span_label(args.operands[prev].1, "previously here")
220 .span_label(span, "duplicate argument")
224 if !args.reg_args.is_empty() {
225 let mut err = diag.struct_span_err(
227 "named arguments cannot follow explicit register arguments",
229 err.span_label(span, "named argument");
230 for pos in &args.reg_args {
231 err.span_label(args.operands[*pos].1, "explicit register argument");
235 args.named_args.insert(name, slot);
237 if !args.named_args.is_empty() || !args.reg_args.is_empty() {
238 let mut err = diag.struct_span_err(
240 "positional arguments cannot follow named arguments \
241 or explicit register arguments",
243 err.span_label(span, "positional argument");
244 for pos in args.named_args.values() {
245 err.span_label(args.operands[*pos].1, "named argument");
247 for pos in &args.reg_args {
248 err.span_label(args.operands[*pos].1, "explicit register argument");
255 if args.options.contains(ast::InlineAsmOptions::NOMEM)
256 && args.options.contains(ast::InlineAsmOptions::READONLY)
258 let spans = args.options_spans.clone();
259 diag.struct_span_err(spans, "the `nomem` and `readonly` options are mutually exclusive")
262 if args.options.contains(ast::InlineAsmOptions::PURE)
263 && args.options.contains(ast::InlineAsmOptions::NORETURN)
265 let spans = args.options_spans.clone();
266 diag.struct_span_err(spans, "the `pure` and `noreturn` options are mutually exclusive")
269 if args.options.contains(ast::InlineAsmOptions::PURE)
270 && !args.options.intersects(ast::InlineAsmOptions::NOMEM | ast::InlineAsmOptions::READONLY)
272 let spans = args.options_spans.clone();
273 diag.struct_span_err(
275 "the `pure` option must be combined with either `nomem` or `readonly`",
280 let mut have_real_output = false;
281 let mut outputs_sp = vec![];
282 let mut regclass_outputs = vec![];
283 for (op, op_sp) in &args.operands {
285 ast::InlineAsmOperand::Out { reg, expr, .. }
286 | ast::InlineAsmOperand::SplitInOut { reg, out_expr: expr, .. } => {
287 outputs_sp.push(*op_sp);
288 have_real_output |= expr.is_some();
289 if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg {
290 regclass_outputs.push(*op_sp);
293 ast::InlineAsmOperand::InOut { reg, .. } => {
294 outputs_sp.push(*op_sp);
295 have_real_output = true;
296 if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg {
297 regclass_outputs.push(*op_sp);
303 if args.options.contains(ast::InlineAsmOptions::PURE) && !have_real_output {
304 diag.struct_span_err(
305 args.options_spans.clone(),
306 "asm with the `pure` option must have at least one output",
310 if args.options.contains(ast::InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() {
312 .struct_span_err(outputs_sp, "asm outputs are not allowed with the `noreturn` option");
314 // Bail out now since this is likely to confuse MIR
318 if args.clobber_abis.len() > 0 {
320 let err = diag.struct_span_err(
321 args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
322 "`clobber_abi` cannot be used with `global_asm!`",
325 // Bail out now since this is likely to confuse later stages
328 if !regclass_outputs.is_empty() {
329 diag.struct_span_err(
330 regclass_outputs.clone(),
331 "asm with `clobber_abi` must specify explicit registers for outputs",
334 args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
337 .span_labels(regclass_outputs, "generic outputs")
345 /// Report a duplicate option error.
347 /// This function must be called immediately after the option token is parsed.
348 /// Otherwise, the suggestion will be incorrect.
349 fn err_duplicate_option<'a>(p: &mut Parser<'a>, symbol: Symbol, span: Span) {
353 .struct_span_err(span, &format!("the `{}` option was already provided", symbol));
354 err.span_label(span, "this option was already provided");
357 let mut full_span = span;
358 if p.token.kind == token::Comma {
359 full_span = full_span.to(p.token.span);
361 err.tool_only_span_suggestion(
363 "remove this option",
365 Applicability::MachineApplicable,
371 /// Try to set the provided option in the provided `AsmArgs`.
372 /// If it is already set, report a duplicate option error.
374 /// This function must be called immediately after the option token is parsed.
375 /// Otherwise, the error will not point to the correct spot.
376 fn try_set_option<'a>(
380 option: ast::InlineAsmOptions,
382 if !args.options.contains(option) {
383 args.options |= option;
385 err_duplicate_option(p, symbol, p.prev_token.span);
389 fn parse_options<'a>(
393 ) -> PResult<'a, ()> {
394 let span_start = p.prev_token.span;
396 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
398 while !p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
399 if !is_global_asm && p.eat_keyword(sym::pure) {
400 try_set_option(p, args, sym::pure, ast::InlineAsmOptions::PURE);
401 } else if !is_global_asm && p.eat_keyword(sym::nomem) {
402 try_set_option(p, args, sym::nomem, ast::InlineAsmOptions::NOMEM);
403 } else if !is_global_asm && p.eat_keyword(sym::readonly) {
404 try_set_option(p, args, sym::readonly, ast::InlineAsmOptions::READONLY);
405 } else if !is_global_asm && p.eat_keyword(sym::preserves_flags) {
406 try_set_option(p, args, sym::preserves_flags, ast::InlineAsmOptions::PRESERVES_FLAGS);
407 } else if !is_global_asm && p.eat_keyword(sym::noreturn) {
408 try_set_option(p, args, sym::noreturn, ast::InlineAsmOptions::NORETURN);
409 } else if !is_global_asm && p.eat_keyword(sym::nostack) {
410 try_set_option(p, args, sym::nostack, ast::InlineAsmOptions::NOSTACK);
411 } else if p.eat_keyword(sym::att_syntax) {
412 try_set_option(p, args, sym::att_syntax, ast::InlineAsmOptions::ATT_SYNTAX);
413 } else if p.eat_keyword(kw::Raw) {
414 try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::RAW);
415 } else if p.eat_keyword(sym::may_unwind) {
416 try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::MAY_UNWIND);
418 return p.unexpected();
421 // Allow trailing commas
422 if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
425 p.expect(&token::Comma)?;
428 let new_span = span_start.to(p.prev_token.span);
429 args.options_spans.push(new_span);
434 fn parse_clobber_abi<'a>(p: &mut Parser<'a>, args: &mut AsmArgs) -> PResult<'a, ()> {
435 let span_start = p.prev_token.span;
437 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
439 if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
440 let err = p.sess.span_diagnostic.struct_span_err(
442 "at least one abi must be provided as an argument to `clobber_abi`",
447 let mut new_abis = Vec::new();
449 match p.parse_str_lit() {
451 new_abis.push((str_lit.symbol_unescaped, str_lit.span));
454 // If the non-string literal is a closing paren then it's the end of the list and is fine
455 if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
458 let span = opt_lit.map_or(p.token.span, |lit| lit.span);
460 p.sess.span_diagnostic.struct_span_err(span, "expected string literal");
461 err.span_label(span, "not a string literal");
466 // Allow trailing commas
467 if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
470 p.expect(&token::Comma)?;
473 let full_span = span_start.to(p.prev_token.span);
475 if !args.options_spans.is_empty() {
479 .struct_span_err(full_span, "clobber_abi is not allowed after options");
480 err.span_labels(args.options_spans.clone(), "options");
484 match &new_abis[..] {
485 // should have errored above during parsing
486 [] => unreachable!(),
487 [(abi, _span)] => args.clobber_abis.push((*abi, full_span)),
489 for (abi, span) in abis {
490 args.clobber_abis.push((*abi, *span));
500 explicit_reg: &mut bool,
501 ) -> PResult<'a, ast::InlineAsmRegOrRegClass> {
502 p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
503 let result = match p.token.uninterpolate().kind {
504 token::Ident(name, false) => ast::InlineAsmRegOrRegClass::RegClass(name),
505 token::Literal(token::Lit { kind: token::LitKind::Str, symbol, suffix: _ }) => {
506 *explicit_reg = true;
507 ast::InlineAsmRegOrRegClass::Reg(symbol)
511 p.struct_span_err(p.token.span, "expected register class or explicit register")
516 p.expect(&token::CloseDelim(token::DelimToken::Paren))?;
520 fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, args: AsmArgs) -> Option<ast::InlineAsm> {
521 let mut template = vec![];
522 // Register operands are implicitly used since they are not allowed to be
523 // referenced in the template string.
524 let mut used = vec![false; args.operands.len()];
525 for pos in &args.reg_args {
528 let named_pos: FxHashMap<usize, Symbol> =
529 args.named_args.iter().map(|(&sym, &idx)| (idx, sym)).collect();
530 let mut line_spans = Vec::with_capacity(args.templates.len());
533 let mut template_strs = Vec::with_capacity(args.templates.len());
535 for template_expr in args.templates.into_iter() {
536 if !template.is_empty() {
537 template.push(ast::InlineAsmTemplatePiece::String("\n".to_string()));
540 let msg = "asm template must be a string literal";
541 let template_sp = template_expr.span;
542 let (template_str, template_style, template_span) =
543 match expr_to_spanned_string(ecx, template_expr, msg) {
544 Ok(template_part) => template_part,
546 if let Some((mut err, _)) = err {
553 let str_style = match template_style {
554 ast::StrStyle::Cooked => None,
555 ast::StrStyle::Raw(raw) => Some(raw as usize),
558 let template_snippet = ecx.source_map().span_to_snippet(template_sp).ok();
561 template_snippet.as_ref().map(|s| Symbol::intern(s)),
564 let template_str = template_str.as_str();
566 if let Some(InlineAsmArch::X86 | InlineAsmArch::X86_64) = ecx.sess.asm_arch {
567 let find_span = |needle: &str| -> Span {
568 if let Some(snippet) = &template_snippet {
569 if let Some(pos) = snippet.find(needle) {
572 .find(|c| matches!(c, '\n' | ';' | '\\' | '"'))
573 .unwrap_or(snippet[pos..].len() - 1);
574 let inner = InnerSpan::new(pos, end);
575 return template_sp.from_inner(inner);
581 if template_str.contains(".intel_syntax") {
582 ecx.parse_sess().buffer_lint(
583 lint::builtin::BAD_ASM_STYLE,
584 find_span(".intel_syntax"),
585 ecx.current_expansion.lint_node_id,
586 "avoid using `.intel_syntax`, Intel syntax is the default",
589 if template_str.contains(".att_syntax") {
590 ecx.parse_sess().buffer_lint(
591 lint::builtin::BAD_ASM_STYLE,
592 find_span(".att_syntax"),
593 ecx.current_expansion.lint_node_id,
594 "avoid using `.att_syntax`, prefer using `options(att_syntax)` instead",
599 // Don't treat raw asm as a format string.
600 if args.options.contains(ast::InlineAsmOptions::RAW) {
601 template.push(ast::InlineAsmTemplatePiece::String(template_str.to_string()));
602 let template_num_lines = 1 + template_str.matches('\n').count();
603 line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines));
607 let mut parser = parse::Parser::new(
612 parse::ParseMode::InlineAsm,
614 parser.curarg = curarg;
616 let mut unverified_pieces = Vec::new();
617 while let Some(piece) = parser.next() {
618 if !parser.errors.is_empty() {
621 unverified_pieces.push(piece);
625 if !parser.errors.is_empty() {
626 let err = parser.errors.remove(0);
627 let err_sp = template_span.from_inner(err.span);
628 let msg = &format!("invalid asm template string: {}", err.description);
629 let mut e = ecx.struct_span_err(err_sp, msg);
630 e.span_label(err_sp, err.label + " in asm template string");
631 if let Some(note) = err.note {
634 if let Some((label, span)) = err.secondary_label {
635 let err_sp = template_span.from_inner(span);
636 e.span_label(err_sp, label);
642 curarg = parser.curarg;
644 let mut arg_spans = parser.arg_places.iter().map(|span| template_span.from_inner(*span));
645 for piece in unverified_pieces {
647 parse::Piece::String(s) => {
648 template.push(ast::InlineAsmTemplatePiece::String(s.to_string()))
650 parse::Piece::NextArgument(arg) => {
651 let span = arg_spans.next().unwrap_or(template_sp);
653 let operand_idx = match arg.position {
654 parse::ArgumentIs(idx) | parse::ArgumentImplicitlyIs(idx) => {
655 if idx >= args.operands.len()
656 || named_pos.contains_key(&idx)
657 || args.reg_args.contains(&idx)
659 let msg = format!("invalid reference to argument at index {}", idx);
660 let mut err = ecx.struct_span_err(span, &msg);
661 err.span_label(span, "from here");
663 let positional_args = args.operands.len()
664 - args.named_args.len()
665 - args.reg_args.len();
666 let positional = if positional_args != args.operands.len() {
671 let msg = match positional_args {
672 0 => format!("no {}arguments were given", positional),
673 1 => format!("there is 1 {}argument", positional),
674 x => format!("there are {} {}arguments", x, positional),
678 if named_pos.contains_key(&idx) {
679 err.span_label(args.operands[idx].1, "named argument");
681 args.operands[idx].1,
682 "named arguments cannot be referenced by position",
684 } else if args.reg_args.contains(&idx) {
686 args.operands[idx].1,
687 "explicit register argument",
690 args.operands[idx].1,
691 "explicit register arguments cannot be used in the asm template",
700 parse::ArgumentNamed(name, span) => match args.named_args.get(&name) {
701 Some(&idx) => Some(idx),
703 let msg = format!("there is no argument named `{}`", name);
704 ecx.struct_span_err(template_span.from_inner(span), &msg).emit();
710 let mut chars = arg.format.ty.chars();
711 let mut modifier = chars.next();
712 if chars.next().is_some() {
716 .map(|sp| template_sp.from_inner(sp))
717 .unwrap_or(template_sp);
720 "asm template modifier must be a single character",
726 if let Some(operand_idx) = operand_idx {
727 used[operand_idx] = true;
728 template.push(ast::InlineAsmTemplatePiece::Placeholder {
738 if parser.line_spans.is_empty() {
739 let template_num_lines = 1 + template_str.matches('\n').count();
740 line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines));
742 line_spans.extend(parser.line_spans.iter().map(|span| template_span.from_inner(*span)));
746 let mut unused_operands = vec![];
747 let mut help_str = String::new();
748 for (idx, used) in used.into_iter().enumerate() {
750 let msg = if let Some(sym) = named_pos.get(&idx) {
751 help_str.push_str(&format!(" {{{}}}", sym));
752 "named argument never used"
754 help_str.push_str(&format!(" {{{}}}", idx));
755 "argument never used"
757 unused_operands.push((args.operands[idx].1, msg));
760 match unused_operands.len() {
763 let (sp, msg) = unused_operands.into_iter().next().unwrap();
764 let mut err = ecx.struct_span_err(sp, msg);
765 err.span_label(sp, msg);
767 "if this argument is intentionally unused, \
768 consider using it in an asm comment: `\"/*{} */\"`",
774 let mut err = ecx.struct_span_err(
775 unused_operands.iter().map(|&(sp, _)| sp).collect::<Vec<Span>>(),
776 "multiple unused asm arguments",
778 for (sp, msg) in unused_operands {
779 err.span_label(sp, msg);
782 "if these arguments are intentionally unused, \
783 consider using them in an asm comment: `\"/*{} */\"`",
790 Some(ast::InlineAsm {
792 template_strs: template_strs.into_boxed_slice(),
793 operands: args.operands,
794 clobber_abis: args.clobber_abis,
795 options: args.options,
800 pub(super) fn expand_asm<'cx>(
801 ecx: &'cx mut ExtCtxt<'_>,
804 ) -> Box<dyn base::MacResult + 'cx> {
805 match parse_args(ecx, sp, tts, false) {
807 let expr = if let Some(inline_asm) = expand_preparsed_asm(ecx, args) {
809 id: ast::DUMMY_NODE_ID,
810 kind: ast::ExprKind::InlineAsm(P(inline_asm)),
812 attrs: ast::AttrVec::new(),
816 DummyResult::raw_expr(sp, true)
827 pub(super) fn expand_global_asm<'cx>(
828 ecx: &'cx mut ExtCtxt<'_>,
831 ) -> Box<dyn base::MacResult + 'cx> {
832 match parse_args(ecx, sp, tts, true) {
834 if let Some(inline_asm) = expand_preparsed_asm(ecx, args) {
835 MacEager::items(smallvec![P(ast::Item {
836 ident: Ident::empty(),
838 id: ast::DUMMY_NODE_ID,
839 kind: ast::ItemKind::GlobalAsm(Box::new(inline_asm)),
840 vis: ast::Visibility {
841 span: sp.shrink_to_lo(),
842 kind: ast::VisibilityKind::Inherited,
845 span: ecx.with_def_site_ctxt(sp),