bjoernager/rust
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fmt-debug option

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Allows disabling `fmt::Debug` derive and debug formatting.
This commit is contained in:
Kornel 2024-04-14 13:52:58 +01:00
parent 100fde5246
commit 88b9edc9db
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38 changed files with 285 additions and 56 deletions
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13
compiler/rustc_builtin_macros/src/deriving/debug.rs
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@ -1,5 +1,6 @@
use rustc_ast::{self as ast, EnumDef, MetaItem};
use rustc_expand::base::{Annotatable, ExtCtxt};
use rustc_session::config::FmtDebug;
use rustc_span::symbol::{sym, Ident, Symbol};
use rustc_span::Span;
use thin_vec::{thin_vec, ThinVec};
@ -49,6 +50,11 @@ fn show_substructure(cx: &ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) ->
// We want to make sure we have the ctxt set so that we can use unstable methods
let span = cx.with_def_site_ctxt(span);
let fmt_detail = cx.sess.opts.unstable_opts.fmt_debug;
if fmt_detail == FmtDebug::None {
return BlockOrExpr::new_expr(cx.expr_ok(span, cx.expr_tuple(span, ThinVec::new())));
}
let (ident, vdata, fields) = match substr.fields {
Struct(vdata, fields) => (substr.type_ident, *vdata, fields),
EnumMatching(_, v, fields) => (v.ident, &v.data, fields),
@ -61,6 +67,13 @@ fn show_substructure(cx: &ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) ->
let name = cx.expr_str(span, ident.name);
let fmt = substr.nonselflike_args[0].clone();
// Fieldless enums have been special-cased earlier
if fmt_detail == FmtDebug::Shallow {
let fn_path_write_str = cx.std_path(&[sym::fmt, sym::Formatter, sym::write_str]);
let expr = cx.expr_call_global(span, fn_path_write_str, thin_vec![fmt, name]);
return BlockOrExpr::new_expr(expr);
}
// Struct and tuples are similar enough that we use the same code for both,
// with some extra pieces for structs due to the field names.
let (is_struct, args_per_field) = match vdata {