| use rustc_ast as ast; |
| use rustc_ast::ptr::P; |
| use rustc_ast::token::{self, Delimiter}; |
| use rustc_ast::tokenstream::TokenStream; |
| use rustc_data_structures::fx::{FxHashMap, FxIndexMap}; |
| use rustc_errors::PResult; |
| use rustc_expand::base::{self, *}; |
| use rustc_index::bit_set::GrowableBitSet; |
| use rustc_parse::parser::Parser; |
| use rustc_parse_format as parse; |
| use rustc_session::lint; |
| use rustc_session::parse::ParseSess; |
| use rustc_span::symbol::Ident; |
| use rustc_span::symbol::{kw, sym, Symbol}; |
| use rustc_span::{InnerSpan, Span}; |
| use rustc_target::asm::InlineAsmArch; |
| use smallvec::smallvec; |
| |
| use crate::errors; |
| |
| pub struct AsmArgs { |
| pub templates: Vec<P<ast::Expr>>, |
| pub operands: Vec<(ast::InlineAsmOperand, Span)>, |
| named_args: FxIndexMap<Symbol, usize>, |
| reg_args: GrowableBitSet<usize>, |
| pub clobber_abis: Vec<(Symbol, Span)>, |
| options: ast::InlineAsmOptions, |
| pub options_spans: Vec<Span>, |
| } |
| |
| fn parse_args<'a>( |
| ecx: &mut ExtCtxt<'a>, |
| sp: Span, |
| tts: TokenStream, |
| is_global_asm: bool, |
| ) -> PResult<'a, AsmArgs> { |
| let mut p = ecx.new_parser_from_tts(tts); |
| let sess = &ecx.sess.parse_sess; |
| parse_asm_args(&mut p, sess, sp, is_global_asm) |
| } |
| |
| // Primarily public for rustfmt consumption. |
| // Internal consumers should continue to leverage `expand_asm`/`expand__global_asm` |
| pub fn parse_asm_args<'a>( |
| p: &mut Parser<'a>, |
| sess: &'a ParseSess, |
| sp: Span, |
| is_global_asm: bool, |
| ) -> PResult<'a, AsmArgs> { |
| let diag = &sess.span_diagnostic; |
| |
| if p.token == token::Eof { |
| return Err(diag.create_err(errors::AsmRequiresTemplate { span: sp })); |
| } |
| |
| let first_template = p.parse_expr()?; |
| let mut args = AsmArgs { |
| templates: vec![first_template], |
| operands: vec![], |
| named_args: Default::default(), |
| reg_args: Default::default(), |
| clobber_abis: Vec::new(), |
| options: ast::InlineAsmOptions::empty(), |
| options_spans: vec![], |
| }; |
| |
| let mut allow_templates = true; |
| while p.token != token::Eof { |
| if !p.eat(&token::Comma) { |
| if allow_templates { |
| // After a template string, we always expect *only* a comma... |
| return Err(diag.create_err(errors::AsmExpectedComma { span: p.token.span })); |
| } else { |
| // ...after that delegate to `expect` to also include the other expected tokens. |
| return Err(p.expect(&token::Comma).err().unwrap()); |
| } |
| } |
| if p.token == token::Eof { |
| break; |
| } // accept trailing commas |
| |
| // Parse clobber_abi |
| if p.eat_keyword(sym::clobber_abi) { |
| parse_clobber_abi(p, &mut args)?; |
| allow_templates = false; |
| continue; |
| } |
| |
| // Parse options |
| if p.eat_keyword(sym::options) { |
| parse_options(p, &mut args, is_global_asm)?; |
| allow_templates = false; |
| continue; |
| } |
| |
| let span_start = p.token.span; |
| |
| // Parse operand names |
| let name = if p.token.is_ident() && p.look_ahead(1, |t| *t == token::Eq) { |
| let (ident, _) = p.token.ident().unwrap(); |
| p.bump(); |
| p.expect(&token::Eq)?; |
| allow_templates = false; |
| Some(ident.name) |
| } else { |
| None |
| }; |
| |
| let mut explicit_reg = false; |
| let op = if !is_global_asm && p.eat_keyword(kw::In) { |
| let reg = parse_reg(p, &mut explicit_reg)?; |
| if p.eat_keyword(kw::Underscore) { |
| let err = diag.create_err(errors::AsmUnderscoreInput { span: p.token.span }); |
| return Err(err); |
| } |
| let expr = p.parse_expr()?; |
| ast::InlineAsmOperand::In { reg, expr } |
| } else if !is_global_asm && p.eat_keyword(sym::out) { |
| let reg = parse_reg(p, &mut explicit_reg)?; |
| let expr = if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) }; |
| ast::InlineAsmOperand::Out { reg, expr, late: false } |
| } else if !is_global_asm && p.eat_keyword(sym::lateout) { |
| let reg = parse_reg(p, &mut explicit_reg)?; |
| let expr = if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) }; |
| ast::InlineAsmOperand::Out { reg, expr, late: true } |
| } else if !is_global_asm && p.eat_keyword(sym::inout) { |
| let reg = parse_reg(p, &mut explicit_reg)?; |
| if p.eat_keyword(kw::Underscore) { |
| let err = diag.create_err(errors::AsmUnderscoreInput { span: p.token.span }); |
| return Err(err); |
| } |
| let expr = p.parse_expr()?; |
| if p.eat(&token::FatArrow) { |
| let out_expr = |
| if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) }; |
| ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: false } |
| } else { |
| ast::InlineAsmOperand::InOut { reg, expr, late: false } |
| } |
| } else if !is_global_asm && p.eat_keyword(sym::inlateout) { |
| let reg = parse_reg(p, &mut explicit_reg)?; |
| if p.eat_keyword(kw::Underscore) { |
| let err = diag.create_err(errors::AsmUnderscoreInput { span: p.token.span }); |
| return Err(err); |
| } |
| let expr = p.parse_expr()?; |
| if p.eat(&token::FatArrow) { |
| let out_expr = |
| if p.eat_keyword(kw::Underscore) { None } else { Some(p.parse_expr()?) }; |
| ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: true } |
| } else { |
| ast::InlineAsmOperand::InOut { reg, expr, late: true } |
| } |
| } else if p.eat_keyword(kw::Const) { |
| let anon_const = p.parse_expr_anon_const()?; |
| ast::InlineAsmOperand::Const { anon_const } |
| } else if p.eat_keyword(sym::sym) { |
| let expr = p.parse_expr()?; |
| let ast::ExprKind::Path(qself, path) = &expr.kind else { |
| let err = diag |
| .create_err(errors::AsmSymNoPath { span: expr.span }); |
| return Err(err); |
| }; |
| let sym = ast::InlineAsmSym { |
| id: ast::DUMMY_NODE_ID, |
| qself: qself.clone(), |
| path: path.clone(), |
| }; |
| ast::InlineAsmOperand::Sym { sym } |
| } else if allow_templates { |
| let template = p.parse_expr()?; |
| // If it can't possibly expand to a string, provide diagnostics here to include other |
| // things it could have been. |
| match template.kind { |
| ast::ExprKind::Lit(token_lit) |
| if matches!( |
| token_lit.kind, |
| token::LitKind::Str | token::LitKind::StrRaw(_) |
| ) => {} |
| ast::ExprKind::MacCall(..) => {} |
| _ => { |
| let err = diag.create_err(errors::AsmExpectedOther { |
| span: template.span, |
| is_global_asm, |
| }); |
| return Err(err); |
| } |
| } |
| args.templates.push(template); |
| continue; |
| } else { |
| return p.unexpected(); |
| }; |
| |
| allow_templates = false; |
| let span = span_start.to(p.prev_token.span); |
| let slot = args.operands.len(); |
| args.operands.push((op, span)); |
| |
| // Validate the order of named, positional & explicit register operands and |
| // clobber_abi/options. We do this at the end once we have the full span |
| // of the argument available. |
| if explicit_reg { |
| if name.is_some() { |
| diag.emit_err(errors::AsmExplicitRegisterName { span }); |
| } |
| args.reg_args.insert(slot); |
| } else if let Some(name) = name { |
| if let Some(&prev) = args.named_args.get(&name) { |
| diag.emit_err(errors::AsmDuplicateArg { span, name, prev: args.operands[prev].1 }); |
| continue; |
| } |
| args.named_args.insert(name, slot); |
| } else { |
| if !args.named_args.is_empty() || !args.reg_args.is_empty() { |
| let named = args.named_args.values().map(|p| args.operands[*p].1).collect(); |
| let explicit = args.reg_args.iter().map(|p| args.operands[p].1).collect(); |
| |
| diag.emit_err(errors::AsmPositionalAfter { span, named, explicit }); |
| } |
| } |
| } |
| |
| if args.options.contains(ast::InlineAsmOptions::NOMEM) |
| && args.options.contains(ast::InlineAsmOptions::READONLY) |
| { |
| let spans = args.options_spans.clone(); |
| diag.emit_err(errors::AsmMutuallyExclusive { spans, opt1: "nomem", opt2: "readonly" }); |
| } |
| if args.options.contains(ast::InlineAsmOptions::PURE) |
| && args.options.contains(ast::InlineAsmOptions::NORETURN) |
| { |
| let spans = args.options_spans.clone(); |
| diag.emit_err(errors::AsmMutuallyExclusive { spans, opt1: "pure", opt2: "noreturn" }); |
| } |
| if args.options.contains(ast::InlineAsmOptions::PURE) |
| && !args.options.intersects(ast::InlineAsmOptions::NOMEM | ast::InlineAsmOptions::READONLY) |
| { |
| let spans = args.options_spans.clone(); |
| diag.emit_err(errors::AsmPureCombine { spans }); |
| } |
| |
| let mut have_real_output = false; |
| let mut outputs_sp = vec![]; |
| let mut regclass_outputs = vec![]; |
| for (op, op_sp) in &args.operands { |
| match op { |
| ast::InlineAsmOperand::Out { reg, expr, .. } |
| | ast::InlineAsmOperand::SplitInOut { reg, out_expr: expr, .. } => { |
| outputs_sp.push(*op_sp); |
| have_real_output |= expr.is_some(); |
| if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg { |
| regclass_outputs.push(*op_sp); |
| } |
| } |
| ast::InlineAsmOperand::InOut { reg, .. } => { |
| outputs_sp.push(*op_sp); |
| have_real_output = true; |
| if let ast::InlineAsmRegOrRegClass::RegClass(_) = reg { |
| regclass_outputs.push(*op_sp); |
| } |
| } |
| _ => {} |
| } |
| } |
| if args.options.contains(ast::InlineAsmOptions::PURE) && !have_real_output { |
| diag.emit_err(errors::AsmPureNoOutput { spans: args.options_spans.clone() }); |
| } |
| if args.options.contains(ast::InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() { |
| let err = diag.create_err(errors::AsmNoReturn { outputs_sp }); |
| // Bail out now since this is likely to confuse MIR |
| return Err(err); |
| } |
| |
| if args.clobber_abis.len() > 0 { |
| if is_global_asm { |
| let err = diag.create_err(errors::GlobalAsmClobberAbi { |
| spans: args.clobber_abis.iter().map(|(_, span)| *span).collect(), |
| }); |
| |
| // Bail out now since this is likely to confuse later stages |
| return Err(err); |
| } |
| if !regclass_outputs.is_empty() { |
| diag.emit_err(errors::AsmClobberNoReg { |
| spans: regclass_outputs, |
| clobbers: args.clobber_abis.iter().map(|(_, span)| *span).collect(), |
| }); |
| } |
| } |
| |
| Ok(args) |
| } |
| |
| /// Report a duplicate option error. |
| /// |
| /// This function must be called immediately after the option token is parsed. |
| /// Otherwise, the suggestion will be incorrect. |
| fn err_duplicate_option(p: &mut Parser<'_>, symbol: Symbol, span: Span) { |
| // Tool-only output |
| let full_span = if p.token.kind == token::Comma { span.to(p.token.span) } else { span }; |
| p.sess.span_diagnostic.emit_err(errors::AsmOptAlreadyprovided { span, symbol, full_span }); |
| } |
| |
| /// Try to set the provided option in the provided `AsmArgs`. |
| /// If it is already set, report a duplicate option error. |
| /// |
| /// This function must be called immediately after the option token is parsed. |
| /// Otherwise, the error will not point to the correct spot. |
| fn try_set_option<'a>( |
| p: &mut Parser<'a>, |
| args: &mut AsmArgs, |
| symbol: Symbol, |
| option: ast::InlineAsmOptions, |
| ) { |
| if !args.options.contains(option) { |
| args.options |= option; |
| } else { |
| err_duplicate_option(p, symbol, p.prev_token.span); |
| } |
| } |
| |
| fn parse_options<'a>( |
| p: &mut Parser<'a>, |
| args: &mut AsmArgs, |
| is_global_asm: bool, |
| ) -> PResult<'a, ()> { |
| let span_start = p.prev_token.span; |
| |
| p.expect(&token::OpenDelim(Delimiter::Parenthesis))?; |
| |
| while !p.eat(&token::CloseDelim(Delimiter::Parenthesis)) { |
| if !is_global_asm && p.eat_keyword(sym::pure) { |
| try_set_option(p, args, sym::pure, ast::InlineAsmOptions::PURE); |
| } else if !is_global_asm && p.eat_keyword(sym::nomem) { |
| try_set_option(p, args, sym::nomem, ast::InlineAsmOptions::NOMEM); |
| } else if !is_global_asm && p.eat_keyword(sym::readonly) { |
| try_set_option(p, args, sym::readonly, ast::InlineAsmOptions::READONLY); |
| } else if !is_global_asm && p.eat_keyword(sym::preserves_flags) { |
| try_set_option(p, args, sym::preserves_flags, ast::InlineAsmOptions::PRESERVES_FLAGS); |
| } else if !is_global_asm && p.eat_keyword(sym::noreturn) { |
| try_set_option(p, args, sym::noreturn, ast::InlineAsmOptions::NORETURN); |
| } else if !is_global_asm && p.eat_keyword(sym::nostack) { |
| try_set_option(p, args, sym::nostack, ast::InlineAsmOptions::NOSTACK); |
| } else if !is_global_asm && p.eat_keyword(sym::may_unwind) { |
| try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::MAY_UNWIND); |
| } else if p.eat_keyword(sym::att_syntax) { |
| try_set_option(p, args, sym::att_syntax, ast::InlineAsmOptions::ATT_SYNTAX); |
| } else if p.eat_keyword(kw::Raw) { |
| try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::RAW); |
| } else { |
| return p.unexpected(); |
| } |
| |
| // Allow trailing commas |
| if p.eat(&token::CloseDelim(Delimiter::Parenthesis)) { |
| break; |
| } |
| p.expect(&token::Comma)?; |
| } |
| |
| let new_span = span_start.to(p.prev_token.span); |
| args.options_spans.push(new_span); |
| |
| Ok(()) |
| } |
| |
| fn parse_clobber_abi<'a>(p: &mut Parser<'a>, args: &mut AsmArgs) -> PResult<'a, ()> { |
| let span_start = p.prev_token.span; |
| |
| p.expect(&token::OpenDelim(Delimiter::Parenthesis))?; |
| |
| if p.eat(&token::CloseDelim(Delimiter::Parenthesis)) { |
| let err = p.sess.span_diagnostic.struct_span_err( |
| p.token.span, |
| "at least one abi must be provided as an argument to `clobber_abi`", |
| ); |
| return Err(err); |
| } |
| |
| let mut new_abis = Vec::new(); |
| loop { |
| match p.parse_str_lit() { |
| Ok(str_lit) => { |
| new_abis.push((str_lit.symbol_unescaped, str_lit.span)); |
| } |
| Err(opt_lit) => { |
| // If the non-string literal is a closing paren then it's the end of the list and is fine |
| if p.eat(&token::CloseDelim(Delimiter::Parenthesis)) { |
| break; |
| } |
| let span = opt_lit.map_or(p.token.span, |lit| lit.span); |
| let mut err = |
| p.sess.span_diagnostic.struct_span_err(span, "expected string literal"); |
| err.span_label(span, "not a string literal"); |
| return Err(err); |
| } |
| }; |
| |
| // Allow trailing commas |
| if p.eat(&token::CloseDelim(Delimiter::Parenthesis)) { |
| break; |
| } |
| p.expect(&token::Comma)?; |
| } |
| |
| let full_span = span_start.to(p.prev_token.span); |
| |
| match &new_abis[..] { |
| // should have errored above during parsing |
| [] => unreachable!(), |
| [(abi, _span)] => args.clobber_abis.push((*abi, full_span)), |
| [abis @ ..] => { |
| for (abi, span) in abis { |
| args.clobber_abis.push((*abi, *span)); |
| } |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| fn parse_reg<'a>( |
| p: &mut Parser<'a>, |
| explicit_reg: &mut bool, |
| ) -> PResult<'a, ast::InlineAsmRegOrRegClass> { |
| p.expect(&token::OpenDelim(Delimiter::Parenthesis))?; |
| let result = match p.token.uninterpolate().kind { |
| token::Ident(name, false) => ast::InlineAsmRegOrRegClass::RegClass(name), |
| token::Literal(token::Lit { kind: token::LitKind::Str, symbol, suffix: _ }) => { |
| *explicit_reg = true; |
| ast::InlineAsmRegOrRegClass::Reg(symbol) |
| } |
| _ => { |
| return Err( |
| p.struct_span_err(p.token.span, "expected register class or explicit register") |
| ); |
| } |
| }; |
| p.bump(); |
| p.expect(&token::CloseDelim(Delimiter::Parenthesis))?; |
| Ok(result) |
| } |
| |
| fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, args: AsmArgs) -> Option<ast::InlineAsm> { |
| let mut template = vec![]; |
| // Register operands are implicitly used since they are not allowed to be |
| // referenced in the template string. |
| let mut used = vec![false; args.operands.len()]; |
| for pos in args.reg_args.iter() { |
| used[pos] = true; |
| } |
| let named_pos: FxHashMap<usize, Symbol> = |
| args.named_args.iter().map(|(&sym, &idx)| (idx, sym)).collect(); |
| let mut line_spans = Vec::with_capacity(args.templates.len()); |
| let mut curarg = 0; |
| |
| let mut template_strs = Vec::with_capacity(args.templates.len()); |
| |
| for (i, template_expr) in args.templates.into_iter().enumerate() { |
| if i != 0 { |
| template.push(ast::InlineAsmTemplatePiece::String("\n".to_string())); |
| } |
| |
| let msg = "asm template must be a string literal"; |
| let template_sp = template_expr.span; |
| let (template_str, template_style, template_span) = |
| match expr_to_spanned_string(ecx, template_expr, msg) { |
| Ok(template_part) => template_part, |
| Err(err) => { |
| if let Some((mut err, _)) = err { |
| err.emit(); |
| } |
| return None; |
| } |
| }; |
| |
| let str_style = match template_style { |
| ast::StrStyle::Cooked => None, |
| ast::StrStyle::Raw(raw) => Some(raw as usize), |
| }; |
| |
| let template_snippet = ecx.source_map().span_to_snippet(template_sp).ok(); |
| template_strs.push(( |
| template_str, |
| template_snippet.as_deref().map(Symbol::intern), |
| template_sp, |
| )); |
| let template_str = template_str.as_str(); |
| |
| if let Some(InlineAsmArch::X86 | InlineAsmArch::X86_64) = ecx.sess.asm_arch { |
| let find_span = |needle: &str| -> Span { |
| if let Some(snippet) = &template_snippet { |
| if let Some(pos) = snippet.find(needle) { |
| let end = pos |
| + snippet[pos..] |
| .find(|c| matches!(c, '\n' | ';' | '\\' | '"')) |
| .unwrap_or(snippet[pos..].len() - 1); |
| let inner = InnerSpan::new(pos, end); |
| return template_sp.from_inner(inner); |
| } |
| } |
| template_sp |
| }; |
| |
| if template_str.contains(".intel_syntax") { |
| ecx.parse_sess().buffer_lint( |
| lint::builtin::BAD_ASM_STYLE, |
| find_span(".intel_syntax"), |
| ecx.current_expansion.lint_node_id, |
| "avoid using `.intel_syntax`, Intel syntax is the default", |
| ); |
| } |
| if template_str.contains(".att_syntax") { |
| ecx.parse_sess().buffer_lint( |
| lint::builtin::BAD_ASM_STYLE, |
| find_span(".att_syntax"), |
| ecx.current_expansion.lint_node_id, |
| "avoid using `.att_syntax`, prefer using `options(att_syntax)` instead", |
| ); |
| } |
| } |
| |
| // Don't treat raw asm as a format string. |
| if args.options.contains(ast::InlineAsmOptions::RAW) { |
| template.push(ast::InlineAsmTemplatePiece::String(template_str.to_string())); |
| let template_num_lines = 1 + template_str.matches('\n').count(); |
| line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines)); |
| continue; |
| } |
| |
| let mut parser = parse::Parser::new( |
| template_str, |
| str_style, |
| template_snippet, |
| false, |
| parse::ParseMode::InlineAsm, |
| ); |
| parser.curarg = curarg; |
| |
| let mut unverified_pieces = Vec::new(); |
| while let Some(piece) = parser.next() { |
| if !parser.errors.is_empty() { |
| break; |
| } else { |
| unverified_pieces.push(piece); |
| } |
| } |
| |
| if !parser.errors.is_empty() { |
| let err = parser.errors.remove(0); |
| let err_sp = template_span.from_inner(InnerSpan::new(err.span.start, err.span.end)); |
| let msg = format!("invalid asm template string: {}", err.description); |
| let mut e = ecx.struct_span_err(err_sp, msg); |
| e.span_label(err_sp, err.label + " in asm template string"); |
| if let Some(note) = err.note { |
| e.note(note); |
| } |
| if let Some((label, span)) = err.secondary_label { |
| let err_sp = template_span.from_inner(InnerSpan::new(span.start, span.end)); |
| e.span_label(err_sp, label); |
| } |
| e.emit(); |
| return None; |
| } |
| |
| curarg = parser.curarg; |
| |
| let mut arg_spans = parser |
| .arg_places |
| .iter() |
| .map(|span| template_span.from_inner(InnerSpan::new(span.start, span.end))); |
| for piece in unverified_pieces { |
| match piece { |
| parse::Piece::String(s) => { |
| template.push(ast::InlineAsmTemplatePiece::String(s.to_string())) |
| } |
| parse::Piece::NextArgument(arg) => { |
| let span = arg_spans.next().unwrap_or(template_sp); |
| |
| let operand_idx = match arg.position { |
| parse::ArgumentIs(idx) | parse::ArgumentImplicitlyIs(idx) => { |
| if idx >= args.operands.len() |
| || named_pos.contains_key(&idx) |
| || args.reg_args.contains(idx) |
| { |
| let msg = format!("invalid reference to argument at index {}", idx); |
| let mut err = ecx.struct_span_err(span, msg); |
| err.span_label(span, "from here"); |
| |
| let positional_args = args.operands.len() |
| - args.named_args.len() |
| - args.reg_args.len(); |
| let positional = if positional_args != args.operands.len() { |
| "positional " |
| } else { |
| "" |
| }; |
| let msg = match positional_args { |
| 0 => format!("no {}arguments were given", positional), |
| 1 => format!("there is 1 {}argument", positional), |
| x => format!("there are {} {}arguments", x, positional), |
| }; |
| err.note(msg); |
| |
| if named_pos.contains_key(&idx) { |
| err.span_label(args.operands[idx].1, "named argument"); |
| err.span_note( |
| args.operands[idx].1, |
| "named arguments cannot be referenced by position", |
| ); |
| } else if args.reg_args.contains(idx) { |
| err.span_label( |
| args.operands[idx].1, |
| "explicit register argument", |
| ); |
| err.span_note( |
| args.operands[idx].1, |
| "explicit register arguments cannot be used in the asm template", |
| ); |
| err.span_help( |
| args.operands[idx].1, |
| "use the register name directly in the assembly code", |
| ); |
| } |
| err.emit(); |
| None |
| } else { |
| Some(idx) |
| } |
| } |
| parse::ArgumentNamed(name) => { |
| match args.named_args.get(&Symbol::intern(name)) { |
| Some(&idx) => Some(idx), |
| None => { |
| let msg = format!("there is no argument named `{}`", name); |
| let span = arg.position_span; |
| ecx.struct_span_err( |
| template_span |
| .from_inner(InnerSpan::new(span.start, span.end)), |
| msg, |
| ) |
| .emit(); |
| None |
| } |
| } |
| } |
| }; |
| |
| let mut chars = arg.format.ty.chars(); |
| let mut modifier = chars.next(); |
| if chars.next().is_some() { |
| let span = arg |
| .format |
| .ty_span |
| .map(|sp| template_sp.from_inner(InnerSpan::new(sp.start, sp.end))) |
| .unwrap_or(template_sp); |
| ecx.emit_err(errors::AsmModifierInvalid { span }); |
| modifier = None; |
| } |
| |
| if let Some(operand_idx) = operand_idx { |
| used[operand_idx] = true; |
| template.push(ast::InlineAsmTemplatePiece::Placeholder { |
| operand_idx, |
| modifier, |
| span, |
| }); |
| } |
| } |
| } |
| } |
| |
| if parser.line_spans.is_empty() { |
| let template_num_lines = 1 + template_str.matches('\n').count(); |
| line_spans.extend(std::iter::repeat(template_sp).take(template_num_lines)); |
| } else { |
| line_spans.extend( |
| parser |
| .line_spans |
| .iter() |
| .map(|span| template_span.from_inner(InnerSpan::new(span.start, span.end))), |
| ); |
| }; |
| } |
| |
| let mut unused_operands = vec![]; |
| let mut help_str = String::new(); |
| for (idx, used) in used.into_iter().enumerate() { |
| if !used { |
| let msg = if let Some(sym) = named_pos.get(&idx) { |
| help_str.push_str(&format!(" {{{}}}", sym)); |
| "named argument never used" |
| } else { |
| help_str.push_str(&format!(" {{{}}}", idx)); |
| "argument never used" |
| }; |
| unused_operands.push((args.operands[idx].1, msg)); |
| } |
| } |
| match unused_operands.len() { |
| 0 => {} |
| 1 => { |
| let (sp, msg) = unused_operands.into_iter().next().unwrap(); |
| let mut err = ecx.struct_span_err(sp, msg); |
| err.span_label(sp, msg); |
| err.help(format!( |
| "if this argument is intentionally unused, \ |
| consider using it in an asm comment: `\"/*{} */\"`", |
| help_str |
| )); |
| err.emit(); |
| } |
| _ => { |
| let mut err = ecx.struct_span_err( |
| unused_operands.iter().map(|&(sp, _)| sp).collect::<Vec<Span>>(), |
| "multiple unused asm arguments", |
| ); |
| for (sp, msg) in unused_operands { |
| err.span_label(sp, msg); |
| } |
| err.help(format!( |
| "if these arguments are intentionally unused, \ |
| consider using them in an asm comment: `\"/*{} */\"`", |
| help_str |
| )); |
| err.emit(); |
| } |
| } |
| |
| Some(ast::InlineAsm { |
| template, |
| template_strs: template_strs.into_boxed_slice(), |
| operands: args.operands, |
| clobber_abis: args.clobber_abis, |
| options: args.options, |
| line_spans, |
| }) |
| } |
| |
| pub(super) fn expand_asm<'cx>( |
| ecx: &'cx mut ExtCtxt<'_>, |
| sp: Span, |
| tts: TokenStream, |
| ) -> Box<dyn base::MacResult + 'cx> { |
| match parse_args(ecx, sp, tts, false) { |
| Ok(args) => { |
| let expr = if let Some(inline_asm) = expand_preparsed_asm(ecx, args) { |
| P(ast::Expr { |
| id: ast::DUMMY_NODE_ID, |
| kind: ast::ExprKind::InlineAsm(P(inline_asm)), |
| span: sp, |
| attrs: ast::AttrVec::new(), |
| tokens: None, |
| }) |
| } else { |
| DummyResult::raw_expr(sp, true) |
| }; |
| MacEager::expr(expr) |
| } |
| Err(mut err) => { |
| err.emit(); |
| DummyResult::any(sp) |
| } |
| } |
| } |
| |
| pub(super) fn expand_global_asm<'cx>( |
| ecx: &'cx mut ExtCtxt<'_>, |
| sp: Span, |
| tts: TokenStream, |
| ) -> Box<dyn base::MacResult + 'cx> { |
| match parse_args(ecx, sp, tts, true) { |
| Ok(args) => { |
| if let Some(inline_asm) = expand_preparsed_asm(ecx, args) { |
| MacEager::items(smallvec![P(ast::Item { |
| ident: Ident::empty(), |
| attrs: ast::AttrVec::new(), |
| id: ast::DUMMY_NODE_ID, |
| kind: ast::ItemKind::GlobalAsm(Box::new(inline_asm)), |
| vis: ast::Visibility { |
| span: sp.shrink_to_lo(), |
| kind: ast::VisibilityKind::Inherited, |
| tokens: None, |
| }, |
| span: ecx.with_def_site_ctxt(sp), |
| tokens: None, |
| })]) |
| } else { |
| DummyResult::any(sp) |
| } |
| } |
| Err(mut err) => { |
| err.emit(); |
| DummyResult::any(sp) |
| } |
| } |
| } |
