diff options
20 files changed, 687 insertions, 105 deletions
diff --git a/compiler/rustc_codegen_cranelift/patches/0029-stdlib-Disable-f16-and-f128-in-compiler-builtins.patch b/compiler/rustc_codegen_cranelift/patches/0029-stdlib-Disable-f16-and-f128-in-compiler-builtins.patch index 6012af6a8dd..bf07e455a75 100644 --- a/compiler/rustc_codegen_cranelift/patches/0029-stdlib-Disable-f16-and-f128-in-compiler-builtins.patch +++ b/compiler/rustc_codegen_cranelift/patches/0029-stdlib-Disable-f16-and-f128-in-compiler-builtins.patch @@ -16,8 +16,8 @@ index 7165c3e48af..968552ad435 100644 [dependencies] core = { path = "../core" } --compiler_builtins = { version = "=0.1.138", features = ['rustc-dep-of-std'] } -+compiler_builtins = { version = "=0.1.138", features = ['rustc-dep-of-std', 'no-f16-f128'] } +-compiler_builtins = { version = "=0.1.140", features = ['rustc-dep-of-std'] } ++compiler_builtins = { version = "=0.1.140", features = ['rustc-dep-of-std', 'no-f16-f128'] } [dev-dependencies] rand = { version = "0.8.5", default-features = false, features = ["alloc"] } diff --git a/compiler/rustc_lint/src/default_could_be_derived.rs b/compiler/rustc_lint/src/default_could_be_derived.rs new file mode 100644 index 00000000000..d95cbb05158 --- /dev/null +++ b/compiler/rustc_lint/src/default_could_be_derived.rs @@ -0,0 +1,185 @@ +use rustc_data_structures::fx::FxHashMap; +use rustc_errors::Diag; +use rustc_hir as hir; +use rustc_middle::ty; +use rustc_session::{declare_lint, impl_lint_pass}; +use rustc_span::Symbol; +use rustc_span::symbol::sym; + +use crate::{LateContext, LateLintPass}; + +declare_lint! { + /// The `default_overrides_default_fields` lint checks for manual `impl` blocks of the + /// `Default` trait of types with default field values. + /// + /// ### Example + /// + /// ```rust,compile_fail + /// #![feature(default_field_values)] + /// struct Foo { + /// x: i32 = 101, + /// y: NonDefault, + /// } + /// + /// struct NonDefault; + /// + /// #[deny(default_overrides_default_fields)] + /// impl Default for Foo { + /// fn default() -> Foo { + /// Foo { x: 100, y: NonDefault } + /// } + /// } + /// ``` + /// + /// {{produces}} + /// + /// ### Explanation + /// + /// Manually writing a `Default` implementation for a type that has + /// default field values runs the risk of diverging behavior between + /// `Type { .. }` and `<Type as Default>::default()`, which would be a + /// foot-gun for users of that type that would expect these to be + /// equivalent. If `Default` can't be derived due to some fields not + /// having a `Default` implementation, we encourage the use of `..` for + /// the fields that do have a default field value. + pub DEFAULT_OVERRIDES_DEFAULT_FIELDS, + Deny, + "detect `Default` impl that should use the type's default field values", + @feature_gate = default_field_values; +} + +#[derive(Default)] +pub(crate) struct DefaultCouldBeDerived; + +impl_lint_pass!(DefaultCouldBeDerived => [DEFAULT_OVERRIDES_DEFAULT_FIELDS]); + +impl<'tcx> LateLintPass<'tcx> for DefaultCouldBeDerived { + fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) { + // Look for manual implementations of `Default`. + let Some(default_def_id) = cx.tcx.get_diagnostic_item(sym::Default) else { return }; + let hir::ImplItemKind::Fn(_sig, body_id) = impl_item.kind else { return }; + let assoc = cx.tcx.associated_item(impl_item.owner_id); + let parent = assoc.container_id(cx.tcx); + if cx.tcx.has_attr(parent, sym::automatically_derived) { + // We don't care about what `#[derive(Default)]` produces in this lint. + return; + } + let Some(trait_ref) = cx.tcx.impl_trait_ref(parent) else { return }; + let trait_ref = trait_ref.instantiate_identity(); + if trait_ref.def_id != default_def_id { + return; + } + let ty = trait_ref.self_ty(); + let ty::Adt(def, _) = ty.kind() else { return }; + + // We now know we have a manually written definition of a `<Type as Default>::default()`. + + let hir = cx.tcx.hir(); + + let type_def_id = def.did(); + let body = hir.body(body_id); + + // FIXME: evaluate bodies with statements and evaluate bindings to see if they would be + // derivable. + let hir::ExprKind::Block(hir::Block { stmts: _, expr: Some(expr), .. }, None) = + body.value.kind + else { + return; + }; + + // Keep a mapping of field name to `hir::FieldDef` for every field in the type. We'll use + // these to check for things like checking whether it has a default or using its span for + // suggestions. + let orig_fields = match hir.get_if_local(type_def_id) { + Some(hir::Node::Item(hir::Item { + kind: + hir::ItemKind::Struct(hir::VariantData::Struct { fields, recovered: _ }, _generics), + .. + })) => fields.iter().map(|f| (f.ident.name, f)).collect::<FxHashMap<_, _>>(), + _ => return, + }; + + // We check `fn default()` body is a single ADT literal and get all the fields that are + // being set. + let hir::ExprKind::Struct(_qpath, fields, tail) = expr.kind else { return }; + + // We have a struct literal + // + // struct Foo { + // field: Type, + // } + // + // impl Default for Foo { + // fn default() -> Foo { + // Foo { + // field: val, + // } + // } + // } + // + // We would suggest `#[derive(Default)]` if `field` has a default value, regardless of what + // it is; we don't want to encourage divergent behavior between `Default::default()` and + // `..`. + + if let hir::StructTailExpr::Base(_) = tail { + // This is *very* niche. We'd only get here if someone wrote + // impl Default for Ty { + // fn default() -> Ty { + // Ty { ..something() } + // } + // } + // where `something()` would have to be a call or path. + // We have nothing meaninful to do with this. + return; + } + + // At least one of the fields with a default value have been overriden in + // the `Default` implementation. We suggest removing it and relying on `..` + // instead. + let any_default_field_given = + fields.iter().any(|f| orig_fields.get(&f.ident.name).and_then(|f| f.default).is_some()); + + if !any_default_field_given { + // None of the default fields were actually provided explicitly, so the manual impl + // doesn't override them (the user used `..`), so there's no risk of divergent behavior. + return; + } + + let Some(local) = parent.as_local() else { return }; + let hir_id = cx.tcx.local_def_id_to_hir_id(local); + let hir::Node::Item(item) = cx.tcx.hir_node(hir_id) else { return }; + cx.tcx.node_span_lint(DEFAULT_OVERRIDES_DEFAULT_FIELDS, hir_id, item.span, |diag| { + mk_lint(diag, orig_fields, fields); + }); + } +} + +fn mk_lint( + diag: &mut Diag<'_, ()>, + orig_fields: FxHashMap<Symbol, &hir::FieldDef<'_>>, + fields: &[hir::ExprField<'_>], +) { + diag.primary_message("`Default` impl doesn't use the declared default field values"); + + // For each field in the struct expression + // - if the field in the type has a default value, it should be removed + // - elif the field is an expression that could be a default value, it should be used as the + // field's default value (FIXME: not done). + // - else, we wouldn't touch this field, it would remain in the manual impl + let mut removed_all_fields = true; + for field in fields { + if orig_fields.get(&field.ident.name).and_then(|f| f.default).is_some() { + diag.span_label(field.expr.span, "this field has a default value"); + } else { + removed_all_fields = false; + } + } + + diag.help(if removed_all_fields { + "to avoid divergence in behavior between `Struct { .. }` and \ + `<Struct as Default>::default()`, derive the `Default`" + } else { + "use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them \ + diverging over time" + }); +} diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs index d7f0d2a6941..1465c2cff7b 100644 --- a/compiler/rustc_lint/src/lib.rs +++ b/compiler/rustc_lint/src/lib.rs @@ -41,6 +41,7 @@ mod async_fn_in_trait; pub mod builtin; mod context; mod dangling; +mod default_could_be_derived; mod deref_into_dyn_supertrait; mod drop_forget_useless; mod early; @@ -85,6 +86,7 @@ use async_closures::AsyncClosureUsage; use async_fn_in_trait::AsyncFnInTrait; use builtin::*; use dangling::*; +use default_could_be_derived::DefaultCouldBeDerived; use deref_into_dyn_supertrait::*; use drop_forget_useless::*; use enum_intrinsics_non_enums::EnumIntrinsicsNonEnums; @@ -189,6 +191,7 @@ late_lint_methods!( BuiltinCombinedModuleLateLintPass, [ ForLoopsOverFallibles: ForLoopsOverFallibles, + DefaultCouldBeDerived: DefaultCouldBeDerived::default(), DerefIntoDynSupertrait: DerefIntoDynSupertrait, DropForgetUseless: DropForgetUseless, ImproperCTypesDeclarations: ImproperCTypesDeclarations, diff --git a/library/Cargo.lock b/library/Cargo.lock index 15ca4cbff7b..40edd2c211c 100644 --- a/library/Cargo.lock +++ b/library/Cargo.lock @@ -61,9 +61,9 @@ dependencies = [ [[package]] name = "compiler_builtins" -version = "0.1.138" +version = "0.1.140" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "53f0ea7fff95b51f84371588f06062557e96bbe363d2b36218ddb806f3ca8611" +checksum = "df14d41c5d172a886df3753d54238eefb0f61c96cbd8b363c33ccc92c457bee3" dependencies = [ "cc", "rustc-std-workspace-core", diff --git a/library/alloc/Cargo.toml b/library/alloc/Cargo.toml index 3464047d4ee..07596fa16f9 100644 --- a/library/alloc/Cargo.toml +++ b/library/alloc/Cargo.toml @@ -10,7 +10,7 @@ edition = "2021" [dependencies] core = { path = "../core" } -compiler_builtins = { version = "=0.1.138", features = ['rustc-dep-of-std'] } +compiler_builtins = { version = "=0.1.140", features = ['rustc-dep-of-std'] } [dev-dependencies] rand = { version = "0.8.5", default-features = false, features = ["alloc"] } diff --git a/library/std/Cargo.toml b/library/std/Cargo.toml index f43dcc1630c..6380c941e6a 100644 --- a/library/std/Cargo.toml +++ b/library/std/Cargo.toml @@ -17,7 +17,7 @@ cfg-if = { version = "1.0", features = ['rustc-dep-of-std'] } panic_unwind = { path = "../panic_unwind", optional = true } panic_abort = { path = "../panic_abort" } core = { path = "../core", public = true } -compiler_builtins = { version = "=0.1.138" } +compiler_builtins = { version = "=0.1.140" } unwind = { path = "../unwind" } hashbrown = { version = "0.15", default-features = false, features = [ 'rustc-dep-of-std', diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs index 67ecdaf9e5e..48149e3b897 100644 --- a/src/tools/compiletest/src/header.rs +++ b/src/tools/compiletest/src/header.rs @@ -978,10 +978,10 @@ impl Config { } } - fn parse_custom_normalization(&self, line: &str) -> Option<NormalizeRule> { + fn parse_custom_normalization(&self, raw_directive: &str) -> Option<NormalizeRule> { // FIXME(Zalathar): Integrate name/value splitting into `DirectiveLine` // instead of doing it here. - let (directive_name, _value) = line.split_once(':')?; + let (directive_name, raw_value) = raw_directive.split_once(':')?; let kind = match directive_name { "normalize-stdout" => NormalizeKind::Stdout, @@ -991,11 +991,9 @@ impl Config { _ => return None, }; - // FIXME(Zalathar): The normalize rule parser should only care about - // the value part, not the "line" (which isn't even the whole line). - let Some((regex, replacement)) = parse_normalize_rule(line) else { + let Some((regex, replacement)) = parse_normalize_rule(raw_value) else { panic!( - "couldn't parse custom normalization rule: `{line}`\n\ + "couldn't parse custom normalization rule: `{raw_directive}`\n\ help: expected syntax is: `{directive_name}: \"REGEX\" -> \"REPLACEMENT\"`" ); }; @@ -1141,24 +1139,26 @@ enum NormalizeKind { /// Parses the regex and replacement values of a `//@ normalize-*` header, /// in the format: /// ```text -/// normalize-*: "REGEX" -> "REPLACEMENT" +/// "REGEX" -> "REPLACEMENT" /// ``` -fn parse_normalize_rule(header: &str) -> Option<(String, String)> { +fn parse_normalize_rule(raw_value: &str) -> Option<(String, String)> { // FIXME: Support escaped double-quotes in strings. let captures = static_regex!( r#"(?x) # (verbose mode regex) ^ - [^:\s]+:\s* # (header name followed by colon) + \s* # (leading whitespace) "(?<regex>[^"]*)" # "REGEX" \s+->\s+ # -> "(?<replacement>[^"]*)" # "REPLACEMENT" $ "# ) - .captures(header)?; + .captures(raw_value)?; let regex = captures["regex"].to_owned(); let replacement = captures["replacement"].to_owned(); - // FIXME: Support escaped new-line in strings. + // A `\n` sequence in the replacement becomes an actual newline. + // FIXME: Do unescaping in a less ad-hoc way, and perhaps support escaped + // backslashes and double-quotes. let replacement = replacement.replace("\\n", "\n"); Some((regex, replacement)) } diff --git a/src/tools/compiletest/src/header/tests.rs b/src/tools/compiletest/src/header/tests.rs index cd7c6f8361e..618b66dfd4c 100644 --- a/src/tools/compiletest/src/header/tests.rs +++ b/src/tools/compiletest/src/header/tests.rs @@ -35,11 +35,14 @@ fn make_test_description<R: Read>( #[test] fn test_parse_normalize_rule() { - let good_data = &[( - r#"normalize-stderr-32bit: "something (32 bits)" -> "something ($WORD bits)""#, - "something (32 bits)", - "something ($WORD bits)", - )]; + let good_data = &[ + ( + r#""something (32 bits)" -> "something ($WORD bits)""#, + "something (32 bits)", + "something ($WORD bits)", + ), + (r#" " with whitespace" -> " replacement""#, " with whitespace", " replacement"), + ]; for &(input, expected_regex, expected_replacement) in good_data { let parsed = parse_normalize_rule(input); @@ -49,15 +52,15 @@ fn test_parse_normalize_rule() { } let bad_data = &[ - r#"normalize-stderr-32bit "something (32 bits)" -> "something ($WORD bits)""#, - r#"normalize-stderr-16bit: something (16 bits) -> something ($WORD bits)"#, - r#"normalize-stderr-32bit: something (32 bits) -> something ($WORD bits)"#, - r#"normalize-stderr-32bit: "something (32 bits) -> something ($WORD bits)"#, - r#"normalize-stderr-32bit: "something (32 bits)" -> "something ($WORD bits)"#, - r#"normalize-stderr-32bit: "something (32 bits)" -> "something ($WORD bits)"."#, + r#"something (11 bits) -> something ($WORD bits)"#, + r#"something (12 bits) -> something ($WORD bits)"#, + r#""something (13 bits) -> something ($WORD bits)"#, + r#""something (14 bits)" -> "something ($WORD bits)"#, + r#""something (15 bits)" -> "something ($WORD bits)"."#, ]; for &input in bad_data { + println!("- {input:?}"); let parsed = parse_normalize_rule(input); assert_eq!(parsed, None); } diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt index f7ecb485152..b20d8678d0e 100644 --- a/src/tools/tidy/src/allowed_run_make_makefiles.txt +++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt @@ -1,8 +1,6 @@ -run-make/branch-protection-check-IBT/Makefile run-make/cat-and-grep-sanity-check/Makefile run-make/extern-fn-reachable/Makefile run-make/jobserver-error/Makefile -run-make/libs-through-symlinks/Makefile run-make/split-debuginfo/Makefile run-make/symbol-mangling-hashed/Makefile run-make/translation/Makefile diff --git a/tests/run-make/branch-protection-check-IBT/Makefile b/tests/run-make/branch-protection-check-IBT/Makefile deleted file mode 100644 index ee0e034627f..00000000000 --- a/tests/run-make/branch-protection-check-IBT/Makefile +++ /dev/null @@ -1,21 +0,0 @@ -# Check for GNU Property Note - -include ../tools.mk - -# How to run this -# python3 x.py test --target x86_64-unknown-linux-gnu tests/run-make/branch-protection-check-IBT/ - -# only-x86_64 - -# ignore-test -# FIXME(jieyouxu): This test never runs because the `ifeq` check on line 17 -# compares `x86` to `x86_64`, which always evaluates to false. -# When the test does run, the compilation does not include `.note.gnu.property`. -# See https://github.com/rust-lang/rust/pull/126720 for more information. - -all: -ifeq ($(filter x86,$(LLVM_COMPONENTS)),x86_64) - $(RUSTC) --target x86_64-unknown-linux-gnu -Z cf-protection=branch -L$(TMPDIR) -C link-args='-nostartfiles' -C save-temps ./main.rs -o $(TMPDIR)/rsmain - readelf -nW $(TMPDIR)/rsmain | $(CGREP) -e ".note.gnu.property" -endif - diff --git a/tests/run-make/branch-protection-check-IBT/_rmake.rs b/tests/run-make/branch-protection-check-IBT/_rmake.rs deleted file mode 100644 index 91151408785..00000000000 --- a/tests/run-make/branch-protection-check-IBT/_rmake.rs +++ /dev/null @@ -1,29 +0,0 @@ -// Check for GNU Property Note - -// How to run this -// python3 x.py test --target x86_64-unknown-linux-gnu tests/run-make/branch-protection-check-IBT/ - -//@ only-x86_64 - -//@ ignore-test -// FIXME(jieyouxu): see the FIXME in the Makefile - -use run_make_support::{cwd, env_var, llvm_readobj, rustc}; - -fn main() { - let llvm_components = env_var("LLVM_COMPONENTS"); - if !format!(" {llvm_components} ").contains(" x86 ") { - return; - } - - rustc() - .input("main.rs") - .target("x86_64-unknown-linux-gnu") - .arg("-Zcf-protection=branch") - .arg(format!("-L{}", cwd().display())) - .arg("-Clink-args=-nostartfiles") - .arg("-Csave-temps") - .run(); - - llvm_readobj().arg("-nW").input("main").run().assert_stdout_contains(".note.gnu.property"); -} diff --git a/tests/run-make/branch-protection-check-IBT/main.rs b/tests/run-make/branch-protection-check-IBT/main.rs index ad379d6ea43..445b8795134 100644 --- a/tests/run-make/branch-protection-check-IBT/main.rs +++ b/tests/run-make/branch-protection-check-IBT/main.rs @@ -1,3 +1,5 @@ -fn main() { - println!("hello world"); -} +#![feature(no_core)] +#![allow(internal_features)] +#![no_core] +#![no_std] +#![no_main] diff --git a/tests/run-make/branch-protection-check-IBT/rmake.rs b/tests/run-make/branch-protection-check-IBT/rmake.rs new file mode 100644 index 00000000000..73109df12ae --- /dev/null +++ b/tests/run-make/branch-protection-check-IBT/rmake.rs @@ -0,0 +1,53 @@ +// ignore-tidy-linelength +//! A basic smoke test to check for GNU Property Note to see that for `x86_64` targets when [`-Z +//! cf-protection=branch`][intel-cet-tracking-issue] is requested, that the +//! +//! ```text +//! NT_GNU_PROPERTY_TYPE_0 Properties: x86 feature: IBT +//! ``` +//! +//! Intel Indirect Branch Tracking (IBT) property is emitted. This was generated in +//! <https://github.com/rust-lang/rust/pull/110304> in order to address +//! <https://github.com/rust-lang/rust/issues/103001>. +//! +//! Note that the precompiled std currently is not compiled with `-Z cf-protection=branch`! +//! +//! In particular, it is expected that: +//! +//! > IBT to only be enabled for the process if `.note.gnu.property` indicates that the executable +//! > was compiled with IBT support and the linker to only tell that IBT is supported if all input +//! > object files indicate that they support IBT, which in turn requires the standard library to be +//! > compiled with IBT enabled. +//! +//! Note that Intel IBT (Indirect Branch Tracking) is not to be confused with Arm's BTI (Branch +//! Target Identification). See below for link to Intel IBT docs. +//! +//! ## Related links +//! +//! - [Tracking Issue for Intel Control Enforcement Technology (CET)][intel-cet-tracking-issue] +//! - Zulip question about this test: +//! <https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.E2.9C.94.20Branch.20protection.20and.20.60.2Enote.2Egnu.2Eproperty.60> +//! - Intel IBT docs: +//! <https://edc.intel.com/content/www/us/en/design/ipla/software-development-platforms/client/platforms/alder-lake-desktop/12th-generation-intel-core-processors-datasheet-volume-1-of-2/006/indirect-branch-tracking/> +//! +//! [intel-cet-tracking-issue]: https://github.com/rust-lang/rust/issues/93754 + +//@ needs-llvm-components: x86 + +// FIXME(#93754): increase the test coverage of this test. +//@ only-x86_64-unknown-linux-gnu +//@ ignore-cross-compile + +use run_make_support::{bare_rustc, llvm_readobj}; + +fn main() { + // `main.rs` is `#![no_std]` to not pull in the currently not-compiled-with-IBT precompiled std. + bare_rustc() + .input("main.rs") + .target("x86_64-unknown-linux-gnu") + .arg("-Zcf-protection=branch") + .arg("-Clink-args=-nostartfiles") + .run(); + + llvm_readobj().arg("-nW").input("main").run().assert_stdout_contains(".note.gnu.property"); +} diff --git a/tests/run-make/libs-through-symlinks/Makefile b/tests/run-make/libs-through-symlinks/Makefile deleted file mode 100644 index c6ff566a0e8..00000000000 --- a/tests/run-make/libs-through-symlinks/Makefile +++ /dev/null @@ -1,22 +0,0 @@ -# ignore-cross-compile -include ../tools.mk - -# ignore-windows - -# The option -n for the AIX ln command has a different purpose than it does -# on Linux. On Linux, the -n option is used to treat the destination path as -# normal file if it is a symbolic link to a directory, which is the default -# behavior of the AIX ln command. -ifeq ($(UNAME),AIX) -LN_FLAGS := -sf -else -LN_FLAGS := -nsf -endif - -NAME := $(shell $(RUSTC) --print file-names foo.rs) - -all: - mkdir -p $(TMPDIR)/outdir - $(RUSTC) foo.rs -o $(TMPDIR)/outdir/$(NAME) - ln $(LN_FLAGS) outdir/$(NAME) $(TMPDIR) - RUSTC_LOG=rustc_metadata::loader $(RUSTC) bar.rs diff --git a/tests/run-make/libs-through-symlinks/rmake.rs b/tests/run-make/libs-through-symlinks/rmake.rs new file mode 100644 index 00000000000..4bb3d05abb7 --- /dev/null +++ b/tests/run-make/libs-through-symlinks/rmake.rs @@ -0,0 +1,48 @@ +//! Regression test for [rustc doesn't handle relative symlinks to libraries +//! #13890](https://github.com/rust-lang/rust/issues/13890). +//! +//! This smoke test checks that for a given library search path `P`: +//! +//! - `rustc` is able to locate a library available via a symlink, where: +//! - the symlink is under the directory subtree of `P`, +//! - but the actual library is not (it's in a different directory subtree). +//! +//! For example: +//! +//! ```text +//! actual_dir/ +//! libfoo.rlib +//! symlink_dir/ # $CWD set; rustc -L . bar.rs that depends on foo +//! libfoo.rlib --> ../actual_dir/libfoo.rlib +//! ``` +//! +//! Previously, if `rustc` was invoked with CWD set to `symlink_dir/`, it would fail to traverse the +//! symlink to locate `actual_dir/libfoo.rlib`. This was originally fixed in +//! <https://github.com/rust-lang/rust/pull/13903>. + +//@ ignore-cross-compile + +use run_make_support::{bare_rustc, cwd, path, rfs, rust_lib_name}; + +fn main() { + let actual_lib_dir = path("actual_lib_dir"); + let symlink_lib_dir = path("symlink_lib_dir"); + rfs::create_dir_all(&actual_lib_dir); + rfs::create_dir_all(&symlink_lib_dir); + + // NOTE: `bare_rustc` is used because it does not introduce an implicit `-L .` library search + // flag. + bare_rustc().input("foo.rs").output(actual_lib_dir.join(rust_lib_name("foo"))).run(); + + rfs::symlink_file( + actual_lib_dir.join(rust_lib_name("foo")), + symlink_lib_dir.join(rust_lib_name("foo")), + ); + + // Make rustc's $CWD be in the directory containing the symlink-to-lib. + bare_rustc() + .current_dir(&symlink_lib_dir) + .library_search_path(".") + .input(cwd().join("bar.rs")) + .run(); +} diff --git a/tests/ui/compiletest-self-test/normalize-with-revision.a.run.stderr b/tests/ui/compiletest-self-test/normalize-with-revision.a.run.stderr new file mode 100644 index 00000000000..3eb3f6b4e57 --- /dev/null +++ b/tests/ui/compiletest-self-test/normalize-with-revision.a.run.stderr @@ -0,0 +1,2 @@ +1st emitted line +second emitted line diff --git a/tests/ui/compiletest-self-test/normalize-with-revision.b.run.stderr b/tests/ui/compiletest-self-test/normalize-with-revision.b.run.stderr new file mode 100644 index 00000000000..8d9156480ab --- /dev/null +++ b/tests/ui/compiletest-self-test/normalize-with-revision.b.run.stderr @@ -0,0 +1,2 @@ +first emitted line +2nd emitted line diff --git a/tests/ui/compiletest-self-test/normalize-with-revision.rs b/tests/ui/compiletest-self-test/normalize-with-revision.rs new file mode 100644 index 00000000000..e1bbbb3eabb --- /dev/null +++ b/tests/ui/compiletest-self-test/normalize-with-revision.rs @@ -0,0 +1,20 @@ +//! Checks that `[rev] normalize-*` directives affect the specified revision, +//! and don't affect other revisions. +//! +//! This currently relies on the fact that `normalize-*` directives are +//! applied to run output, not just compiler output. If that ever changes, +//! this test might need to be adjusted. + +//@ edition: 2021 +//@ revisions: a b +//@ run-pass +//@ check-run-results + +//@ normalize-stderr: "output" -> "emitted" +//@[a] normalize-stderr: "first" -> "1st" +//@[b] normalize-stderr: "second" -> "2nd" + +fn main() { + eprintln!("first output line"); + eprintln!("second output line"); +} diff --git a/tests/ui/structs/manual-default-impl-could-be-derived.rs b/tests/ui/structs/manual-default-impl-could-be-derived.rs new file mode 100644 index 00000000000..773b7389988 --- /dev/null +++ b/tests/ui/structs/manual-default-impl-could-be-derived.rs @@ -0,0 +1,194 @@ +// Warn when we encounter a manual `Default` impl that could be derived. +// Restricted only to types using `default_field_values`. +#![feature(default_field_values)] +#![allow(dead_code)] +#![deny(default_overrides_default_fields)] +struct S(i32); +fn s() -> S { S(1) } + +struct A { + x: S, + y: i32 = 1, +} + +impl Default for A { //~ ERROR default_overrides_default_fields + fn default() -> Self { + A { + y: 0, + x: s(), + } + } +} + +struct B { + x: S = S(3), + y: i32 = 1, +} + +impl Default for B { //~ ERROR default_overrides_default_fields + fn default() -> Self { + B { + x: s(), + y: 0, + } + } +} + +struct C { + x: S, + y: i32 = 1, + z: i32 = 1, +} + +impl Default for C { //~ ERROR default_overrides_default_fields + fn default() -> Self { + C { + x: s(), + y: 0, + .. + } + } +} + +struct D { + x: S, + y: i32 = 1, + z: i32 = 1, +} + +impl Default for D { //~ ERROR default_overrides_default_fields + fn default() -> Self { + D { + y: 0, + x: s(), + .. + } + } +} + +struct E { + x: S, + y: i32 = 1, + z: i32 = 1, +} + +impl Default for E { //~ ERROR default_overrides_default_fields + fn default() -> Self { + E { + y: 0, + z: 0, + x: s(), + } + } +} + +// Let's ensure that the span for `x` and the span for `y` don't overlap when suggesting their +// removal in favor of their default field values. +struct E2 { + x: S, + y: i32 = 1, + z: i32 = 1, +} + +impl Default for E2 { //~ ERROR default_overrides_default_fields + fn default() -> Self { + E2 { + x: s(), + y: i(), + z: 0, + } + } +} + +fn i() -> i32 { + 1 +} + +// Account for a `const fn` being the `Default::default()` of a field's type. +struct F { + x: G, + y: i32 = 1, +} + +impl Default for F { //~ ERROR default_overrides_default_fields + fn default() -> Self { + F { + x: g_const(), + y: 0, + } + } +} + +struct G; + +impl Default for G { // ok + fn default() -> Self { + g_const() + } +} + +const fn g_const() -> G { + G +} + +// Account for a `const fn` being used in `Default::default()`, even if the type doesn't use it as +// its own `Default`. We suggest setting the default field value in that case. +struct H { + x: I, + y: i32 = 1, +} + +impl Default for H { //~ ERROR default_overrides_default_fields + fn default() -> Self { + H { + x: i_const(), + y: 0, + } + } +} + +struct I; + +const fn i_const() -> I { + I +} + +// Account for a `const` and struct literal being the `Default::default()` of a field's type. +struct M { + x: N, + y: i32 = 1, + z: A, +} + +impl Default for M { // ok, `y` is not specified + fn default() -> Self { + M { + x: N_CONST, + z: A { + x: S(0), + y: 0, + }, + .. + } + } +} + +struct N; + +const N_CONST: N = N; + +struct O { + x: Option<i32>, + y: i32 = 1, +} + +impl Default for O { //~ ERROR default_overrides_default_fields + fn default() -> Self { + O { + x: None, + y: 1, + } + } +} + +fn main() {} diff --git a/tests/ui/structs/manual-default-impl-could-be-derived.stderr b/tests/ui/structs/manual-default-impl-could-be-derived.stderr new file mode 100644 index 00000000000..e8f607fac7e --- /dev/null +++ b/tests/ui/structs/manual-default-impl-could-be-derived.stderr @@ -0,0 +1,144 @@ +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:14:1 + | +LL | / impl Default for A { +LL | | fn default() -> Self { +LL | | A { +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time +note: the lint level is defined here + --> $DIR/manual-default-impl-could-be-derived.rs:5:9 + | +LL | #![deny(default_overrides_default_fields)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:28:1 + | +LL | / impl Default for B { +LL | | fn default() -> Self { +LL | | B { +LL | | x: s(), + | | --- this field has a default value +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default` + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:43:1 + | +LL | / impl Default for C { +LL | | fn default() -> Self { +LL | | C { +LL | | x: s(), +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:59:1 + | +LL | / impl Default for D { +LL | | fn default() -> Self { +LL | | D { +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:75:1 + | +LL | / impl Default for E { +LL | | fn default() -> Self { +LL | | E { +LL | | y: 0, + | | - this field has a default value +LL | | z: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:93:1 + | +LL | / impl Default for E2 { +LL | | fn default() -> Self { +LL | | E2 { +LL | | x: s(), +LL | | y: i(), + | | --- this field has a default value +LL | | z: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:113:1 + | +LL | / impl Default for F { +LL | | fn default() -> Self { +LL | | F { +LL | | x: g_const(), +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:141:1 + | +LL | / impl Default for H { +LL | | fn default() -> Self { +LL | | H { +LL | | x: i_const(), +LL | | y: 0, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: `Default` impl doesn't use the declared default field values + --> $DIR/manual-default-impl-could-be-derived.rs:185:1 + | +LL | / impl Default for O { +LL | | fn default() -> Self { +LL | | O { +LL | | x: None, +LL | | y: 1, + | | - this field has a default value +... | +LL | | } + | |_^ + | + = help: use the default values in the `impl` with `Struct { mandatory_field, .. }` to avoid them diverging over time + +error: aborting due to 9 previous errors + |