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Gate fmt args flattening behind -Zflatten-format-args.

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This commit is contained in:
Mara Bos 2023-03-16 11:13:07 +01:00
parent 1d59081bfd
commit 995e57b89e
3 changed files with 9 additions and 2 deletions
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7
compiler/rustc_ast_lowering/src/format.rs
View File

@ -16,8 +16,11 @@ pub(crate) fn lower_format_args(&mut self, sp: Span, fmt: &FormatArgs) -> hir::E
// Never call the const constructor of `fmt::Arguments` if the
// format_args!() had any arguments _before_ flattening/inlining.
let allow_const = fmt.arguments.all_args().is_empty();
let fmt = flatten_format_args(Cow::Borrowed(fmt));
let fmt = inline_literals(fmt);
let mut fmt = Cow::Borrowed(fmt);
if self.tcx.sess.opts.unstable_opts.flatten_format_args {
fmt = flatten_format_args(fmt);
fmt = inline_literals(fmt);
}
expand_format_args(self, sp, &fmt, allow_const)
}
}

1
compiler/rustc_interface/src/tests.rs
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@ -744,6 +744,7 @@ macro_rules! tracked {
tracked!(emit_thin_lto, false);
tracked!(export_executable_symbols, true);
tracked!(fewer_names, Some(true));
tracked!(flatten_format_args, true);
tracked!(force_unstable_if_unmarked, true);
tracked!(fuel, Some(("abc".to_string(), 99)));
tracked!(function_sections, Some(false));

3
compiler/rustc_session/src/options.rs
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@ -1422,6 +1422,9 @@ pub(crate) fn parse_proc_macro_execution_strategy(
fewer_names: Option<bool> = (None, parse_opt_bool, [TRACKED],
"reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) \
(default: no)"),
flatten_format_args: bool = (false, parse_bool, [TRACKED],
"flatten nested format_args!() and literals into a simplified format_args!() call \
(default: no)"),
force_unstable_if_unmarked: bool = (false, parse_bool, [TRACKED],
"force all crates to be `rustc_private` unstable (default: no)"),
fuel: Option<(String, u64)> = (None, parse_optimization_fuel, [TRACKED],