bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Rollup merge of #82270 - asquared31415:asm-syntax-directive-errors, r=nagisa

Browse source 
Emit error when trying to use assembler syntax directives in `asm!`

The `.intel_syntax` and `.att_syntax` assembler directives should not be used, in favor of not specifying a syntax for intel, and in favor of the explicit `att_syntax` option using the inline assembly options.

Closes #79869
This commit is contained in:
Dylan DPC 2021-03-18 00:28:06 +01:00 • committed by GitHub
commit 16f6583f2d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
5 changed files with 181 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

73
compiler/rustc_builtin_macros/src/asm.rs
View file

@ -7,7 +7,10 @@ use rustc_errors::{Applicability, DiagnosticBuilder};
use rustc_expand::base::{self, *};
use rustc_parse::parser::Parser;
use rustc_parse_format as parse;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::{
symbol::{kw, sym, Symbol},
BytePos,
};
use rustc_span::{InnerSpan, Span};
struct AsmArgs {
@ -399,6 +402,8 @@ fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, sp: Span, args: AsmArgs) -> P<ast
let mut line_spans = Vec::with_capacity(args.templates.len());
let mut curarg = 0;
let default_dialect = ecx.sess.inline_asm_dialect();
for template_expr in args.templates.into_iter() {
if !template.is_empty() {
template.push(ast::InlineAsmTemplatePiece::String("\n".to_string()));
@ -424,6 +429,60 @@ fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, sp: Span, args: AsmArgs) -> P<ast
let template_str = &template_str.as_str();
let template_snippet = ecx.source_map().span_to_snippet(template_sp).ok();
if let Some(snippet) = &template_snippet {
let snippet = snippet.trim_matches('"');
match default_dialect {
ast::LlvmAsmDialect::Intel => {
if let Some(span) = check_syntax_directive(snippet, ".intel_syntax") {
let span = template_span.from_inner(span);
let mut err = ecx.struct_span_err(span, "intel syntax is the default syntax on this target, and trying to use this directive may cause issues");
err.span_suggestion(
span,
"remove this assembler directive",
"".to_string(),
Applicability::MachineApplicable,
);
err.emit();
}
if let Some(span) = check_syntax_directive(snippet, ".att_syntax") {
let span = template_span.from_inner(span);
let mut err = ecx.struct_span_err(span, "using the .att_syntax directive may cause issues, use the att_syntax option instead");
let asm_end = sp.hi() - BytePos(2);
let suggestions = vec![
(span, "".to_string()),
(
Span::new(asm_end, asm_end, sp.ctxt()),
", options(att_syntax)".to_string(),
),
];
err.multipart_suggestion(
"remove the assembler directive and replace it with options(att_syntax)",
suggestions,
Applicability::MachineApplicable,
);
err.emit();
}
}
ast::LlvmAsmDialect::Att => {
if let Some(span) = check_syntax_directive(snippet, ".att_syntax") {
let span = template_span.from_inner(span);
let mut err = ecx.struct_span_err(span, "att syntax is the default syntax on this target, and trying to use this directive may cause issues");
err.span_suggestion(
span,
"remove this assembler directive",
"".to_string(),
Applicability::MachineApplicable,
);
err.emit();
}
// Use of .intel_syntax is ignored
}
}
}
let mut parser = parse::Parser::new(
template_str,
str_style,
@ -631,3 +690,15 @@ pub fn expand_asm<'cx>(
}
}
}
fn check_syntax_directive<S: AsRef<str>>(piece: S, syntax: &str) -> Option<InnerSpan> {
let piece = piece.as_ref();
if let Some(idx) = piece.find(syntax) {
let end =
idx + &piece[idx..].find(|c| matches!(c, '\n' | ';')).unwrap_or(piece[idx..].len());
// Offset by one because these represent the span with the " removed
Some(InnerSpan::new(idx + 1, end + 1))
} else {
None
}
}