Skip to content

--print option to list available feature gates #45223

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

--print option to list available feature gates #45223

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
31 changes: 27 additions & 4 deletions src/librustc/session/config.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,7 @@ pub enum PrintRequest {
CodeModels,
TargetSpec,
NativeStaticLibs,
UnstableFeatures,
}

pub enum Input {
Expand Down Expand Up @@ -1306,6 +1307,17 @@ mod opt {
/// including metadata for each option, such as whether the option is
/// part of the stable long-term interface for rustc.
pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
// FIXME: unfortunately, we need to hardcode these nightly vs. stable
// option value listings separately (rather than, say, plumbing in the
// extra nightly values with `format!`) because the `opt` interface
// requires a static lifetime
let stable_print_options = "[crate-name|file-names|sysroot|cfg|target-list|\
target-cpus|target-features|relocation-models|\
code-models|native-static-libs]";
let nightly_print_options = "[crate-name|file-names|sysroot|cfg|target-list|\
target-cpus|target-features|relocation-models|\
code-models|native-static-libs|target-spec-json|\
unstable-features]";
vec![
opt::flag_s("h", "help", "Display this message"),
opt::multi_s("", "cfg", "Configure the compilation environment", "SPEC"),
Expand All @@ -1325,10 +1337,12 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
the compiler to emit",
"[asm|llvm-bc|llvm-ir|obj|metadata|link|dep-info|mir]"),
opt::multi_s("", "print", "Comma separated list of compiler information to \
print on stdout",
"[crate-name|file-names|sysroot|cfg|target-list|\
target-cpus|target-features|relocation-models|\
code-models|target-spec-json|native-static-libs]"),
print on stdout",
if nightly_options::is_nightly_build() {
nightly_print_options
} else {
stable_print_options
}),
opt::flagmulti_s("g", "", "Equivalent to -C debuginfo=2"),
opt::flagmulti_s("O", "", "Equivalent to -C opt-level=2"),
opt::opt_s("o", "", "Write output to <filename>", "FILENAME"),
Expand Down Expand Up @@ -1679,6 +1693,15 @@ pub fn build_session_options_and_crate_config(matches: &getopts::Matches)
enable the target-spec-json print option"));
}
},
"unstable-features" => {
if nightly_options::is_nightly_build() {
PrintRequest::UnstableFeatures
} else {
early_error(error_format,
&format!("unstable features require a nightly \
build of the compiler"));
}
},
req => {
early_error(error_format, &format!("unknown print request `{}`", req))
}
Expand Down
34 changes: 33 additions & 1 deletion src/librustc_driver/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,7 @@ use std::thread;

use syntax::ast;
use syntax::codemap::{CodeMap, FileLoader, RealFileLoader};
use syntax::feature_gate::{GatedCfg, UnstableFeatures};
use syntax::feature_gate::{ACTIVE_FEATURES, GatedCfg, UnstableFeatures};
use syntax::parse::{self, PResult};
use syntax_pos::{DUMMY_SP, MultiSpan};

Expand Down Expand Up @@ -801,6 +801,38 @@ impl RustcDefaultCalls {
PrintRequest::NativeStaticLibs => {
println!("Native static libs can be printed only during linking");
}
PrintRequest::UnstableFeatures => {
let (feat_width, ver_width, iss_width) = ACTIVE_FEATURES.iter()
.map(|&(feat, ver, iss_maybe, _)| {
(feat.len(),
ver.len(),
iss_maybe.map(|no| no.to_string().len()).unwrap_or(1))
})
.fold((7, 7, 5), // lengths of col. headings: "feature", "version", "issue"
|max_widths, feat_widths| {
(max(max_widths.0, feat_widths.0),
max(max_widths.1, feat_widths.1),
max(max_widths.2, feat_widths.2))
});
println!("| {0:feat_width$} | {1:ver_width$} | {2:iss_width$} |",
"feature", "version", "issue",
feat_width = feat_width,
ver_width = ver_width,
iss_width = iss_width);
println!("{:->total_width$}", "",
// `+ 10` is for ` | ` column borders: 2 + 3 + 3 + 2
total_width = feat_width + ver_width + iss_width + 10);
let mut features = ACTIVE_FEATURES.to_vec();
features.sort_by_key(|&f| f.0);
for &(feature, version, issue_maybe, _) in &features {
println!("| {0:feat_width$} | {1:>ver_width$} | {2:>iss_width$} |",
feature, version,
issue_maybe.map(|no| no.to_string()).unwrap_or("—".to_owned()),
feat_width = feat_width,
ver_width = ver_width,
iss_width = iss_width);
}
}
}
}
return Compilation::Stop;
Expand Down
8 changes: 4 additions & 4 deletions src/libsyntax/feature_gate.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ macro_rules! declare_features {
($((active, $feature: ident, $ver: expr, $issue: expr),)+) => {
/// Represents active features that are currently being implemented or
/// currently being considered for addition/removal.
const ACTIVE_FEATURES:
pub const ACTIVE_FEATURES:
&'static [(&'static str, &'static str, Option<u32>, fn(&mut Features, Span))] =
&[$((stringify!($feature), $ver, $issue, set!($feature))),+];

Expand All @@ -84,21 +84,21 @@ macro_rules! declare_features {

($((removed, $feature: ident, $ver: expr, $issue: expr),)+) => {
/// Represents unstable features which have since been removed (it was once Active)
const REMOVED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
pub const REMOVED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
$((stringify!($feature), $ver, $issue)),+
];
};

($((stable_removed, $feature: ident, $ver: expr, $issue: expr),)+) => {
/// Represents stable features which have since been removed (it was once Accepted)
const STABLE_REMOVED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
pub const STABLE_REMOVED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
$((stringify!($feature), $ver, $issue)),+
];
};

($((accepted, $feature: ident, $ver: expr, $issue: expr),)+) => {
/// Those language feature has since been Accepted (it was once Active)
const ACCEPTED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
pub const ACCEPTED_FEATURES: &'static [(&'static str, &'static str, Option<u32>)] = &[
$((stringify!($feature), $ver, $issue)),+
];
}
Expand Down
13 changes: 13 additions & 0 deletions src/test/ui/print/unstable-features.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// compile-flags: --print unstable-features

fn main() {}
108 changes: 108 additions & 0 deletions src/test/ui/print/unstable-features.stdout
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,108 @@
| feature | version | issue |
-----------------------------------------------------
| abi_msp430_interrupt | 1.16.0 | 38487 |
| abi_ptx | 1.15.0 | — |
| abi_sysv64 | 1.13.0 | 36167 |
| abi_thiscall | 1.19.0 | — |
| abi_unadjusted | 1.16.0 | — |
| abi_vectorcall | 1.7.0 | — |
| abi_x86_interrupt | 1.17.0 | 40180 |
| advanced_slice_patterns | 1.0.0 | 23121 |
| allocator_internals | 1.20.0 | — |
| allow_fail | 1.19.0 | 42219 |
| allow_internal_unsafe | 1.0.0 | — |
| allow_internal_unstable | 1.0.0 | — |
| asm | 1.0.0 | 29722 |
| associated_type_defaults | 1.2.0 | 29661 |
| attr_literals | 1.13.0 | 34981 |
| box_patterns | 1.0.0 | 29641 |
| box_syntax | 1.0.0 | 27779 |
| catch_expr | 1.17.0 | 31436 |
| cfg_target_feature | 1.4.0 | 29717 |
| cfg_target_has_atomic | 1.9.0 | 32976 |
| cfg_target_thread_local | 1.7.0 | 29594 |
| cfg_target_vendor | 1.5.0 | 29718 |
| clone_closures | 1.22.0 | 44490 |
| compiler_builtins | 1.13.0 | — |
| concat_idents | 1.0.0 | 29599 |
| conservative_impl_trait | 1.12.0 | 34511 |
| const_fn | 1.2.0 | 24111 |
| const_indexing | 1.4.0 | 29947 |
| copy_closures | 1.22.0 | 44490 |
| custom_attribute | 1.0.0 | 29642 |
| custom_derive | 1.0.0 | 29644 |
| decl_macro | 1.17.0 | 39412 |
| default_type_parameter_fallback | 1.3.0 | 27336 |
| doc_cfg | 1.21.0 | 43781 |
| doc_masked | 1.21.0 | 44027 |
| dotdoteq_in_patterns | 1.22.0 | 28237 |
| dropck_eyepatch | 1.10.0 | 34761 |
| dropck_parametricity | 1.3.0 | 28498 |
| exclusive_range_pattern | 1.11.0 | 37854 |
| fn_must_use | 1.21.0 | 43302 |
| fundamental | 1.0.0 | 29635 |
| generators | 1.21.0 | — |
| generic_param_attrs | 1.11.0 | 34761 |
| global_allocator | 1.20.0 | — |
| global_asm | 1.18.0 | 35119 |
| i128_type | 1.16.0 | 35118 |
| inclusive_range_syntax | 1.7.0 | 28237 |
| intrinsics | 1.0.0 | — |
| lang_items | 1.0.0 | — |
| link_args | 1.0.0 | 29596 |
| link_cfg | 1.14.0 | 37406 |
| link_llvm_intrinsics | 1.0.0 | 29602 |
| linkage | 1.0.0 | 29603 |
| log_syntax | 1.0.0 | 29598 |
| macro_reexport | 1.0.0 | 29638 |
| macro_vis_matcher | 1.18.0 | 41022 |
| main | 1.0.0 | 29634 |
| match_beginning_vert | 1.21.0 | 44101 |
| match_default_bindings | 1.22.0 | 42640 |
| naked_functions | 1.9.0 | 32408 |
| needs_allocator | 1.4.0 | 27389 |
| needs_panic_runtime | 1.10.0 | 32837 |
| never_type | 1.13.0 | 35121 |
| no_core | 1.3.0 | 29639 |
| no_debug | 1.5.0 | 29721 |
| non_ascii_idents | 1.0.0 | 28979 |
| omit_gdb_pretty_printer_section | 1.5.0 | — |
| on_unimplemented | 1.0.0 | 29628 |
| optin_builtin_traits | 1.0.0 | 13231 |
| overlapping_marker_traits | 1.18.0 | 29864 |
| panic_runtime | 1.10.0 | 32837 |
| placement_in_syntax | 1.0.0 | 27779 |
| platform_intrinsics | 1.4.0 | 27731 |
| plugin | 1.0.0 | 29597 |
| plugin_registrar | 1.0.0 | 29597 |
| prelude_import | 1.2.0 | — |
| proc_macro | 1.16.0 | 38356 |
| profiler_runtime | 1.18.0 | — |
| quote | 1.0.0 | 29601 |
| repr128 | 1.16.0 | 35118 |
| repr_align | 1.17.0 | 33626 |
| repr_simd | 1.4.0 | 27731 |
| rustc_attrs | 1.0.0 | 29642 |
| rustc_const_unstable | 1.0.0 | — |
| rustc_diagnostic_macros | 1.0.0 | — |
| sanitizer_runtime | 1.17.0 | — |
| simd | 1.0.0 | 27731 |
| simd_ffi | 1.0.0 | 27731 |
| slice_patterns | 1.0.0 | 23121 |
| specialization | 1.7.0 | 31844 |
| staged_api | 1.0.0 | — |
| start | 1.0.0 | 29633 |
| static_nobundle | 1.16.0 | 37403 |
| stmt_expr_attributes | 1.6.0 | 15701 |
| structural_match | 1.8.0 | 31434 |
| target_feature | 1.15.0 | — |
| thread_local | 1.0.0 | 29594 |
| trace_macros | 1.0.0 | 29598 |
| type_ascription | 1.6.0 | 23416 |
| unboxed_closures | 1.0.0 | 29625 |
| underscore_lifetimes | 1.22.0 | 44524 |
| unsized_tuple_coercion | 1.20.0 | 42877 |
| untagged_unions | 1.13.0 | 32836 |
| unwind_attributes | 1.4.0 | — |
| use_extern_macros | 1.15.0 | 35896 |
| used | 1.18.0 | 40289 |