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-rw-r--r--compiler/rustc_builtin_macros/src/asm.rs875
1 files changed, 875 insertions, 0 deletions
diff --git a/compiler/rustc_builtin_macros/src/asm.rs b/compiler/rustc_builtin_macros/src/asm.rs
new file mode 100644
index 000000000..1a0ea8f41
--- /dev/null
+++ b/compiler/rustc_builtin_macros/src/asm.rs
@@ -0,0 +1,875 @@
+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, FxHashSet};
+use rustc_errors::{Applicability, PResult};
+use rustc_expand::base::{self, *};
+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;
+
+pub struct AsmArgs {
+ pub templates: Vec<P<ast::Expr>>,
+ pub operands: Vec<(ast::InlineAsmOperand, Span)>,
+ named_args: FxHashMap<Symbol, usize>,
+ reg_args: FxHashSet<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.struct_span_err(sp, "requires at least a template string argument"));
+ }
+
+ let first_template = p.parse_expr()?;
+ let mut args = AsmArgs {
+ templates: vec![first_template],
+ operands: vec![],
+ named_args: FxHashMap::default(),
+ reg_args: FxHashSet::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...
+ let mut err = diag.struct_span_err(p.token.span, "expected token: `,`");
+ err.span_label(p.token.span, "expected `,`");
+ p.maybe_annotate_with_ascription(&mut err, false);
+ return Err(err);
+ } 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.struct_span_err(p.token.span, "_ cannot be used for input operands");
+ 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.struct_span_err(p.token.span, "_ cannot be used for input operands");
+ 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.struct_span_err(p.token.span, "_ cannot be used for input operands");
+ 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_anon_const_expr()?;
+ 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
+ .struct_span_err(expr.span, "expected a path for argument to `sym`");
+ 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(ast::Lit { kind: ast::LitKind::Str(..), .. }) => {}
+ ast::ExprKind::MacCall(..) => {}
+ _ => {
+ let errstr = if is_global_asm {
+ "expected operand, options, or additional template string"
+ } else {
+ "expected operand, clobber_abi, options, or additional template string"
+ };
+ let mut err = diag.struct_span_err(template.span, errstr);
+ err.span_label(template.span, errstr);
+ 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 !args.options_spans.is_empty() {
+ diag.struct_span_err(span, "arguments are not allowed after options")
+ .span_labels(args.options_spans.clone(), "previous options")
+ .span_label(span, "argument")
+ .emit();
+ } else if let Some((_, abi_span)) = args.clobber_abis.last() {
+ diag.struct_span_err(span, "arguments are not allowed after clobber_abi")
+ .span_label(*abi_span, "clobber_abi")
+ .span_label(span, "argument")
+ .emit();
+ }
+ if explicit_reg {
+ if name.is_some() {
+ diag.struct_span_err(span, "explicit register arguments cannot have names").emit();
+ }
+ args.reg_args.insert(slot);
+ } else if let Some(name) = name {
+ if let Some(&prev) = args.named_args.get(&name) {
+ diag.struct_span_err(span, &format!("duplicate argument named `{}`", name))
+ .span_label(args.operands[prev].1, "previously here")
+ .span_label(span, "duplicate argument")
+ .emit();
+ continue;
+ }
+ if !args.reg_args.is_empty() {
+ let mut err = diag.struct_span_err(
+ span,
+ "named arguments cannot follow explicit register arguments",
+ );
+ err.span_label(span, "named argument");
+ for pos in &args.reg_args {
+ err.span_label(args.operands[*pos].1, "explicit register argument");
+ }
+ err.emit();
+ }
+ args.named_args.insert(name, slot);
+ } else {
+ if !args.named_args.is_empty() || !args.reg_args.is_empty() {
+ let mut err = diag.struct_span_err(
+ span,
+ "positional arguments cannot follow named arguments \
+ or explicit register arguments",
+ );
+ err.span_label(span, "positional argument");
+ for pos in args.named_args.values() {
+ err.span_label(args.operands[*pos].1, "named argument");
+ }
+ for pos in &args.reg_args {
+ err.span_label(args.operands[*pos].1, "explicit register argument");
+ }
+ err.emit();
+ }
+ }
+ }
+
+ if args.options.contains(ast::InlineAsmOptions::NOMEM)
+ && args.options.contains(ast::InlineAsmOptions::READONLY)
+ {
+ let spans = args.options_spans.clone();
+ diag.struct_span_err(spans, "the `nomem` and `readonly` options are mutually exclusive")
+ .emit();
+ }
+ if args.options.contains(ast::InlineAsmOptions::PURE)
+ && args.options.contains(ast::InlineAsmOptions::NORETURN)
+ {
+ let spans = args.options_spans.clone();
+ diag.struct_span_err(spans, "the `pure` and `noreturn` options are mutually exclusive")
+ .emit();
+ }
+ if args.options.contains(ast::InlineAsmOptions::PURE)
+ && !args.options.intersects(ast::InlineAsmOptions::NOMEM | ast::InlineAsmOptions::READONLY)
+ {
+ let spans = args.options_spans.clone();
+ diag.struct_span_err(
+ spans,
+ "the `pure` option must be combined with either `nomem` or `readonly`",
+ )
+ .emit();
+ }
+
+ 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.struct_span_err(
+ args.options_spans.clone(),
+ "asm with the `pure` option must have at least one output",
+ )
+ .emit();
+ }
+ if args.options.contains(ast::InlineAsmOptions::NORETURN) && !outputs_sp.is_empty() {
+ let err = diag
+ .struct_span_err(outputs_sp, "asm outputs are not allowed with the `noreturn` option");
+
+ // 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.struct_span_err(
+ args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
+ "`clobber_abi` cannot be used with `global_asm!`",
+ );
+
+ // Bail out now since this is likely to confuse later stages
+ return Err(err);
+ }
+ if !regclass_outputs.is_empty() {
+ diag.struct_span_err(
+ regclass_outputs.clone(),
+ "asm with `clobber_abi` must specify explicit registers for outputs",
+ )
+ .span_labels(
+ args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
+ "clobber_abi",
+ )
+ .span_labels(regclass_outputs, "generic outputs")
+ .emit();
+ }
+ }
+
+ 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<'a>(p: &mut Parser<'a>, symbol: Symbol, span: Span) {
+ let mut err = p
+ .sess
+ .span_diagnostic
+ .struct_span_err(span, &format!("the `{}` option was already provided", symbol));
+ err.span_label(span, "this option was already provided");
+
+ // Tool-only output
+ let mut full_span = span;
+ if p.token.kind == token::Comma {
+ full_span = full_span.to(p.token.span);
+ }
+ err.tool_only_span_suggestion(
+ full_span,
+ "remove this option",
+ "",
+ Applicability::MachineApplicable,
+ );
+
+ err.emit();
+}
+
+/// 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);
+
+ if !args.options_spans.is_empty() {
+ let mut err = p
+ .sess
+ .span_diagnostic
+ .struct_span_err(full_span, "clobber_abi is not allowed after options");
+ err.span_labels(args.options_spans.clone(), "options");
+ return Err(err);
+ }
+
+ 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 {
+ 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_ref().map(|s| Symbol::intern(s)),
+ 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.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.struct_span_err(
+ span,
+ "asm template modifier must be a single character",
+ )
+ .emit();
+ 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: Vec::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)
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-26 22:21:02 +0000