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Add StrStyle to ast::LitKind::ByteStr.

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This is required to distinguish between cooked and raw byte string
literals in an `ast::LitKind`, without referring to an adjacent
`token::Lit`. It's a prerequisite for the next commit.
This commit is contained in:
Nicholas Nethercote 2022-11-29 13:35:44 +11:00
parent e658144586
commit a7f35c42d4
18 changed files with 39 additions and 28 deletions
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7
compiler/rustc_ast/src/ast.rs
View File

@ -1796,8 +1796,9 @@ pub enum LitKind {
/// A string literal (`"foo"`). The symbol is unescaped, and so may differ
/// from the original token's symbol.
Str(Symbol, StrStyle),
/// A byte string (`b"foo"`).
ByteStr(Lrc<[u8]>),
/// A byte string (`b"foo"`). Not stored as a symbol because it might be
/// non-utf8, and symbols only allow utf8 strings.
ByteStr(Lrc<[u8]>, StrStyle),
/// A byte char (`b'f'`).
Byte(u8),
/// A character literal (`'a'`).
@ -1822,7 +1823,7 @@ impl LitKind {
/// Returns `true` if this literal is byte literal string.
pub fn is_bytestr(&self) -> bool {
matches!(self, LitKind::ByteStr(_))
matches!(self, LitKind::ByteStr(..))
}
/// Returns `true` if this is a numeric literal.

16
compiler/rustc_ast/src/util/literal.rs
View File

@ -1,11 +1,12 @@
//! Code related to parsing literals.
use crate::ast::{self, LitKind, MetaItemLit};
use crate::ast::{self, LitKind, MetaItemLit, StrStyle};
use crate::token::{self, Token};
use rustc_lexer::unescape::{byte_from_char, unescape_byte, unescape_char, unescape_literal, Mode};
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::Span;
use std::ascii;
use std::str;
#[derive(Debug)]
pub enum LitError {
@ -115,9 +116,9 @@ impl LitKind {
}
});
error?;
LitKind::ByteStr(buf.into())
LitKind::ByteStr(buf.into(), StrStyle::Cooked)
}
token::ByteStrRaw(_) => {
token::ByteStrRaw(n) => {
let s = symbol.as_str();
let bytes = if s.contains('\r') {
let mut buf = Vec::with_capacity(s.len());
@ -136,7 +137,7 @@ impl LitKind {
symbol.to_string().into_bytes()
};
LitKind::ByteStr(bytes.into())
LitKind::ByteStr(bytes.into(), StrStyle::Raw(n))
}
token::Err => LitKind::Err,
})
@ -155,10 +156,15 @@ impl LitKind {
(token::Str, symbol, None)
}
LitKind::Str(symbol, ast::StrStyle::Raw(n)) => (token::StrRaw(n), symbol, None),
LitKind::ByteStr(ref bytes) => {
LitKind::ByteStr(ref bytes, ast::StrStyle::Cooked) => {
let string = bytes.escape_ascii().to_string();
(token::ByteStr, Symbol::intern(&string), None)
}
LitKind::ByteStr(ref bytes, ast::StrStyle::Raw(n)) => {
// Unwrap because raw byte string literals can only contain ASCII.
let string = str::from_utf8(bytes).unwrap();
(token::ByteStrRaw(n), Symbol::intern(&string), None)
}
LitKind::Byte(byte) => {
let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect();
(token::Byte, Symbol::intern(&string), None)

2
compiler/rustc_ast_lowering/src/expr.rs
View File

@ -97,7 +97,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
}
ExprKind::IncludedBytes(bytes) => hir::ExprKind::Lit(respan(
self.lower_span(e.span),
LitKind::ByteStr(bytes.clone()),
LitKind::ByteStr(bytes.clone(), StrStyle::Cooked),
)),
ExprKind::Cast(expr, ty) => {
let expr = self.lower_expr(expr);

3
compiler/rustc_ast_pretty/src/pprust/state/expr.rs
View File

@ -323,7 +323,8 @@ impl<'a> State<'a> {
self.print_token_literal(*token_lit, expr.span);
}
ast::ExprKind::IncludedBytes(bytes) => {
let lit = ast::LitKind::ByteStr(bytes.clone()).synthesize_token_lit();
let lit = ast::LitKind::ByteStr(bytes.clone(), ast::StrStyle::Cooked)
.synthesize_token_lit();
self.print_token_literal(lit, expr.span)
}
ast::ExprKind::Cast(expr, ty) => {

6
compiler/rustc_builtin_macros/src/concat_bytes.rs
View File

@ -69,7 +69,7 @@ fn invalid_type_err(
Ok(ast::LitKind::Int(_, _)) => {
cx.span_err(span, "numeric literal is not a `u8`");
}
Ok(ast::LitKind::ByteStr(_) | ast::LitKind::Byte(_)) => unreachable!(),
Ok(ast::LitKind::ByteStr(..) | ast::LitKind::Byte(_)) => unreachable!(),
Err(err) => {
report_lit_error(&cx.sess.parse_sess, err, token_lit, span);
}
@ -97,7 +97,7 @@ fn handle_array_element(
)) if val <= u8::MAX.into() => Some(val as u8),
Ok(ast::LitKind::Byte(val)) => Some(val),
Ok(ast::LitKind::ByteStr(_)) => {
Ok(ast::LitKind::ByteStr(..)) => {
if !*has_errors {
cx.struct_span_err(expr.span, "cannot concatenate doubly nested array")
.note("byte strings are treated as arrays of bytes")
@ -174,7 +174,7 @@ pub fn expand_concat_bytes(
Ok(ast::LitKind::Byte(val)) => {
accumulator.push(val);
}
Ok(ast::LitKind::ByteStr(ref bytes)) => {
Ok(ast::LitKind::ByteStr(ref bytes, _)) => {
accumulator.extend_from_slice(&bytes);
}
_ => {

2
compiler/rustc_expand/src/base.rs
View File

@ -1234,7 +1234,7 @@ pub fn expr_to_spanned_string<'a>(
Err(match expr.kind {
ast::ExprKind::Lit(token_lit) => match ast::LitKind::from_token_lit(token_lit) {
Ok(ast::LitKind::Str(s, style)) => return Ok((s, style, expr.span)),
Ok(ast::LitKind::ByteStr(_)) => {
Ok(ast::LitKind::ByteStr(..)) => {
let mut err = cx.struct_span_err(expr.span, err_msg);
let span = expr.span.shrink_to_lo();
err.span_suggestion(

2
compiler/rustc_expand/src/build.rs
View File

@ -361,7 +361,7 @@ impl<'a> ExtCtxt<'a> {
}
pub fn expr_byte_str(&self, sp: Span, bytes: Vec<u8>) -> P<ast::Expr> {
self.expr_lit(sp, ast::LitKind::ByteStr(Lrc::from(bytes)))
self.expr_lit(sp, ast::LitKind::ByteStr(Lrc::from(bytes), ast::StrStyle::Cooked))
}
/// `[expr1, expr2, ...]`

3
compiler/rustc_expand/src/proc_macro_server.rs
View File

@ -526,7 +526,8 @@ impl server::TokenStream for Rustc<'_, '_> {
Ok(tokenstream::TokenStream::token_alone(token::Literal(*token_lit), expr.span))
}
ast::ExprKind::IncludedBytes(bytes) => {
let lit = ast::LitKind::ByteStr(bytes.clone()).synthesize_token_lit();
let lit = ast::LitKind::ByteStr(bytes.clone(), ast::StrStyle::Cooked)
.synthesize_token_lit();
Ok(tokenstream::TokenStream::token_alone(token::TokenKind::Literal(lit), expr.span))
}
ast::ExprKind::Unary(ast::UnOp::Neg, e) => match &e.kind {

2
compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs
View File

@ -1169,7 +1169,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
match lit.node {
ast::LitKind::Str(..) => tcx.mk_static_str(),
ast::LitKind::ByteStr(ref v) => {
ast::LitKind::ByteStr(ref v, _) => {
tcx.mk_imm_ref(tcx.lifetimes.re_static, tcx.mk_array(tcx.types.u8, v.len() as u64))
}
ast::LitKind::Byte(_) => tcx.types.u8,

2
compiler/rustc_hir_typeck/src/pat.rs
View File

@ -386,7 +386,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// Byte string patterns behave the same way as array patterns
// They can denote both statically and dynamically-sized byte arrays.
let mut pat_ty = ty;
if let hir::ExprKind::Lit(Spanned { node: ast::LitKind::ByteStr(_), .. }) = lt.kind {
if let hir::ExprKind::Lit(Spanned { node: ast::LitKind::ByteStr(..), .. }) = lt.kind {
let expected = self.structurally_resolved_type(span, expected);
if let ty::Ref(_, inner_ty, _) = expected.kind()
&& matches!(inner_ty.kind(), ty::Slice(_))

4
compiler/rustc_mir_build/src/build/expr/as_constant.rs
View File

@ -135,14 +135,14 @@ pub(crate) fn lit_to_mir_constant<'tcx>(
let allocation = tcx.intern_const_alloc(allocation);
ConstValue::Slice { data: allocation, start: 0, end: s.len() }
}
(ast::LitKind::ByteStr(data), ty::Ref(_, inner_ty, _))
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _))
if matches!(inner_ty.kind(), ty::Slice(_)) =>
{
let allocation = Allocation::from_bytes_byte_aligned_immutable(data as &[u8]);
let allocation = tcx.intern_const_alloc(allocation);
ConstValue::Slice { data: allocation, start: 0, end: data.len() }
}
(ast::LitKind::ByteStr(data), ty::Ref(_, inner_ty, _)) if inner_ty.is_array() => {
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _)) if inner_ty.is_array() => {
let id = tcx.allocate_bytes(data);
ConstValue::Scalar(Scalar::from_pointer(id.into(), &tcx))
}

4
compiler/rustc_mir_build/src/thir/constant.rs
View File

@ -33,13 +33,13 @@ pub(crate) fn lit_to_const<'tcx>(
let str_bytes = s.as_str().as_bytes();
ty::ValTree::from_raw_bytes(tcx, str_bytes)
}
(ast::LitKind::ByteStr(data), ty::Ref(_, inner_ty, _))
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _))
if matches!(inner_ty.kind(), ty::Slice(_)) =>
{
let bytes = data as &[u8];
ty::ValTree::from_raw_bytes(tcx, bytes)
}
(ast::LitKind::ByteStr(data), ty::Ref(_, inner_ty, _)) if inner_ty.is_array() => {
(ast::LitKind::ByteStr(data, _), ty::Ref(_, inner_ty, _)) if inner_ty.is_array() => {
let bytes = data as &[u8];
ty::ValTree::from_raw_bytes(tcx, bytes)
}

2
src/tools/clippy/clippy_lints/src/invalid_utf8_in_unchecked.rs
View File

@ -33,7 +33,7 @@ impl<'tcx> LateLintPass<'tcx> for InvalidUtf8InUnchecked {
if let Some([arg]) = match_function_call(cx, expr, &paths::STR_FROM_UTF8_UNCHECKED) {
match &arg.kind {
ExprKind::Lit(Spanned { node: lit, .. }) => {
if let LitKind::ByteStr(bytes) = &lit
if let LitKind::ByteStr(bytes, _) = &lit
&& std::str::from_utf8(bytes).is_err()
{
lint(cx, expr.span);

2
src/tools/clippy/clippy_lints/src/large_include_file.rs
View File

@ -60,7 +60,7 @@ impl LateLintPass<'_> for LargeIncludeFile {
then {
let len = match &lit.node {
// include_bytes
LitKind::ByteStr(bstr) => bstr.len(),
LitKind::ByteStr(bstr, _) => bstr.len(),
// include_str
LitKind::Str(sym, _) => sym.as_str().len(),
_ => return,

2
src/tools/clippy/clippy_lints/src/matches/match_same_arms.rs
View File

@ -282,7 +282,7 @@ impl<'a> NormalizedPat<'a> {
// TODO: Handle negative integers. They're currently treated as a wild match.
ExprKind::Lit(lit) => match lit.node {
LitKind::Str(sym, _) => Self::LitStr(sym),
LitKind::ByteStr(ref bytes) => Self::LitBytes(bytes),
LitKind::ByteStr(ref bytes, _) => Self::LitBytes(bytes),
LitKind::Byte(val) => Self::LitInt(val.into()),
LitKind::Char(val) => Self::LitInt(val.into()),
LitKind::Int(val, _) => Self::LitInt(val),

2
src/tools/clippy/clippy_lints/src/utils/author.rs
View File

@ -299,7 +299,7 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
};
kind!("Float(_, {float_ty})");
},
LitKind::ByteStr(ref vec) => {
LitKind::ByteStr(ref vec, _) => {
bind!(self, vec);
kind!("ByteStr(ref {vec})");
chain!(self, "let [{:?}] = **{vec}", vec.value);

4
src/tools/clippy/clippy_utils/src/check_proc_macro.rs
View File

@ -69,7 +69,9 @@ fn lit_search_pat(lit: &LitKind) -> (Pat, Pat) {
LitKind::Str(_, StrStyle::Cooked) => (Pat::Str("\""), Pat::Str("\"")),
LitKind::Str(_, StrStyle::Raw(0)) => (Pat::Str("r"), Pat::Str("\"")),
LitKind::Str(_, StrStyle::Raw(_)) => (Pat::Str("r#"), Pat::Str("#")),
LitKind::ByteStr(_) => (Pat::Str("b\""), Pat::Str("\"")),
LitKind::ByteStr(_, StrStyle::Cooked) => (Pat::Str("b\""), Pat::Str("\"")),
LitKind::ByteStr(_, StrStyle::Raw(0)) => (Pat::Str("br\""), Pat::Str("\"")),
LitKind::ByteStr(_, StrStyle::Raw(_)) => (Pat::Str("br#\""), Pat::Str("#")),
LitKind::Byte(_) => (Pat::Str("b'"), Pat::Str("'")),
LitKind::Char(_) => (Pat::Str("'"), Pat::Str("'")),
LitKind::Int(_, LitIntType::Signed(IntTy::Isize)) => (Pat::Num, Pat::Str("isize")),

2
src/tools/clippy/clippy_utils/src/consts.rs
View File

@ -210,7 +210,7 @@ pub fn lit_to_mir_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
match *lit {
LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
LitKind::Byte(b) => Constant::Int(u128::from(b)),
LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
LitKind::ByteStr(ref s, _) => Constant::Binary(Lrc::clone(s)),
LitKind::Char(c) => Constant::Char(c),
LitKind::Int(n, _) => Constant::Int(n),
LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {