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|
use rustc_ast as ast;
use rustc_ast::{ptr::P, tokenstream::TokenStream};
use rustc_expand::base::{self, DummyResult};
use rustc_session::errors::report_lit_error;
use rustc_span::Span;
use crate::errors;
/// Emits errors for literal expressions that are invalid inside and outside of an array.
fn invalid_type_err(
cx: &mut base::ExtCtxt<'_>,
token_lit: ast::token::Lit,
span: Span,
is_nested: bool,
) {
use errors::{
ConcatBytesInvalid, ConcatBytesInvalidSuggestion, ConcatBytesNonU8, ConcatBytesOob,
};
let snippet = cx.sess.source_map().span_to_snippet(span).ok();
match ast::LitKind::from_token_lit(token_lit) {
Ok(ast::LitKind::CStr(_, _)) => {
// FIXME(c_str_literals): should concatenation of C string literals
// include the null bytes in the end?
cx.span_err(span, "cannot concatenate C string literals");
}
Ok(ast::LitKind::Char(_)) => {
let sugg =
snippet.map(|snippet| ConcatBytesInvalidSuggestion::CharLit { span, snippet });
cx.sess.emit_err(ConcatBytesInvalid { span, lit_kind: "character", sugg });
}
Ok(ast::LitKind::Str(_, _)) => {
// suggestion would be invalid if we are nested
let sugg = if !is_nested {
snippet.map(|snippet| ConcatBytesInvalidSuggestion::StrLit { span, snippet })
} else {
None
};
cx.emit_err(ConcatBytesInvalid { span, lit_kind: "string", sugg });
}
Ok(ast::LitKind::Float(_, _)) => {
cx.emit_err(ConcatBytesInvalid { span, lit_kind: "float", sugg: None });
}
Ok(ast::LitKind::Bool(_)) => {
cx.emit_err(ConcatBytesInvalid { span, lit_kind: "boolean", sugg: None });
}
Ok(ast::LitKind::Err) => {}
Ok(ast::LitKind::Int(_, _)) if !is_nested => {
let sugg =
snippet.map(|snippet| ConcatBytesInvalidSuggestion::IntLit { span: span, snippet });
cx.emit_err(ConcatBytesInvalid { span, lit_kind: "numeric", sugg });
}
Ok(ast::LitKind::Int(
val,
ast::LitIntType::Unsuffixed | ast::LitIntType::Unsigned(ast::UintTy::U8),
)) => {
assert!(val > u8::MAX.into()); // must be an error
cx.emit_err(ConcatBytesOob { span });
}
Ok(ast::LitKind::Int(_, _)) => {
cx.emit_err(ConcatBytesNonU8 { span });
}
Ok(ast::LitKind::ByteStr(..) | ast::LitKind::Byte(_)) => unreachable!(),
Err(err) => {
report_lit_error(&cx.sess.parse_sess, err, token_lit, span);
}
}
}
fn handle_array_element(
cx: &mut base::ExtCtxt<'_>,
has_errors: &mut bool,
missing_literals: &mut Vec<rustc_span::Span>,
expr: &P<rustc_ast::Expr>,
) -> Option<u8> {
match expr.kind {
ast::ExprKind::Array(_) | ast::ExprKind::Repeat(_, _) => {
if !*has_errors {
cx.emit_err(errors::ConcatBytesArray { span: expr.span, bytestr: false });
}
*has_errors = true;
None
}
ast::ExprKind::Lit(token_lit) => match ast::LitKind::from_token_lit(token_lit) {
Ok(ast::LitKind::Int(
val,
ast::LitIntType::Unsuffixed | ast::LitIntType::Unsigned(ast::UintTy::U8),
)) if val <= u8::MAX.into() => Some(val as u8),
Ok(ast::LitKind::Byte(val)) => Some(val),
Ok(ast::LitKind::ByteStr(..)) => {
if !*has_errors {
cx.emit_err(errors::ConcatBytesArray { span: expr.span, bytestr: true });
}
*has_errors = true;
None
}
_ => {
if !*has_errors {
invalid_type_err(cx, token_lit, expr.span, true);
}
*has_errors = true;
None
}
},
ast::ExprKind::IncludedBytes(..) => {
if !*has_errors {
cx.emit_err(errors::ConcatBytesArray { span: expr.span, bytestr: false });
}
*has_errors = true;
None
}
_ => {
missing_literals.push(expr.span);
None
}
}
}
pub fn expand_concat_bytes(
cx: &mut base::ExtCtxt<'_>,
sp: rustc_span::Span,
tts: TokenStream,
) -> Box<dyn base::MacResult + 'static> {
let Some(es) = base::get_exprs_from_tts(cx, tts) else {
return DummyResult::any(sp);
};
let mut accumulator = Vec::new();
let mut missing_literals = vec![];
let mut has_errors = false;
for e in es {
match &e.kind {
ast::ExprKind::Array(exprs) => {
for expr in exprs {
if let Some(elem) =
handle_array_element(cx, &mut has_errors, &mut missing_literals, expr)
{
accumulator.push(elem);
}
}
}
ast::ExprKind::Repeat(expr, count) => {
if let ast::ExprKind::Lit(token_lit) = count.value.kind
&& let Ok(ast::LitKind::Int(count_val, _)) =
ast::LitKind::from_token_lit(token_lit)
{
if let Some(elem) =
handle_array_element(cx, &mut has_errors, &mut missing_literals, expr)
{
for _ in 0..count_val {
accumulator.push(elem);
}
}
} else {
cx.emit_err(errors::ConcatBytesBadRepeat {span: count.value.span });
}
}
&ast::ExprKind::Lit(token_lit) => match ast::LitKind::from_token_lit(token_lit) {
Ok(ast::LitKind::Byte(val)) => {
accumulator.push(val);
}
Ok(ast::LitKind::ByteStr(ref bytes, _)) => {
accumulator.extend_from_slice(&bytes);
}
_ => {
if !has_errors {
invalid_type_err(cx, token_lit, e.span, false);
}
has_errors = true;
}
},
ast::ExprKind::IncludedBytes(bytes) => {
accumulator.extend_from_slice(bytes);
}
ast::ExprKind::Err => {
has_errors = true;
}
_ => {
missing_literals.push(e.span);
}
}
}
if !missing_literals.is_empty() {
cx.emit_err(errors::ConcatBytesMissingLiteral { spans: missing_literals });
return base::MacEager::expr(DummyResult::raw_expr(sp, true));
} else if has_errors {
return base::MacEager::expr(DummyResult::raw_expr(sp, true));
}
let sp = cx.with_def_site_ctxt(sp);
base::MacEager::expr(cx.expr_byte_str(sp, accumulator))
}
|
