Auto merge of #55171 - kennytm:rollup, r=kennytm

Rollup of 18 pull requests

Successful merges:

 - #54646 (improve documentation on std::thread::sleep)
 - #54933 (Cleanup the rest of codegen_llvm)
 - #54964 (Run both lldb and gdb tests)
 - #55016 (Deduplicate some code and compile-time values around vtables)
 - #55031 (Improve verify_llvm_ir config option)
 - #55050 (doc std::fmt: the Python inspiration is already mentioned in precedin…)
 - #55077 (rustdoc: Use dyn keyword when rendering dynamic traits)
 - #55080 (Detect if access to localStorage is forbidden by the user's browser)
 - #55090 (regression test for move out of borrow via pattern)
 - #55102 (resolve: Do not skip extern prelude during speculative resolution)
 - #55104 (Add test for #34229)
 - #55111 ([Rustc Book] Explain --cfg's arguments)
 - #55122 (Cleanup mir/borrowck)
 - #55127 (Remove HybridBitSet::dummy)
 - #55128 (Fix LLVMRustInlineAsmVerify return type mismatch)
 - #55142 (miri: layout should not affect CTFE checks (outside of validation))
 - #55151 (Cleanup nll)
 - #55161 ([librustdoc] Disable spellcheck for search field)

Author: bors

src/bootstrap/bin/rustc.rs

@@ -287,10 +287,6 @@ fn main() {
         cmd.arg("--cfg").arg("parallel_queries");
     }
 
-    if env::var_os("RUSTC_VERIFY_LLVM_IR").is_some() {
-        cmd.arg("-Z").arg("verify-llvm-ir");
-    }
-
     if env::var_os("RUSTC_DENY_WARNINGS").is_some() && env::var_os("RUSTC_EXTERNAL_TOOL").is_none()
     {
         cmd.arg("-Dwarnings");

src/bootstrap/builder.rs

@@ -1000,10 +1000,6 @@ impl<'a> Builder<'a> {
             cargo.env("RUSTC_BACKTRACE_ON_ICE", "1");
         }
 
-        if self.config.rust_verify_llvm_ir {
-            cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
-        }
-
         cargo.env("RUSTC_VERBOSE", self.verbosity.to_string());
 
         // in std, we want to avoid denying warnings for stage 0 as that makes cfg's painful.

src/bootstrap/compile.rs

@@ -569,6 +569,9 @@ pub fn rustc_cargo_env(builder: &Builder, cargo: &mut Command) {
     if builder.config.rustc_parallel_queries {
         cargo.env("RUSTC_PARALLEL_QUERIES", "1");
     }
+    if builder.config.rust_verify_llvm_ir {
+        cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
+    }
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]

src/bootstrap/test.rs

@@ -812,8 +812,7 @@ default_test!(Incremental {
 
 default_test!(Debuginfo {
     path: "src/test/debuginfo",
-    // What this runs varies depending on the native platform being apple
-    mode: "debuginfo-XXX",
+    mode: "debuginfo",
     suite: "debuginfo"
 });
 
@@ -950,18 +949,11 @@ impl Step for Compiletest {
                 return;
             }
 
-            if mode == "debuginfo-XXX" {
-                return if builder.config.build.contains("apple") {
-                    builder.ensure(Compiletest {
-                        mode: "debuginfo-lldb",
-                        ..self
-                    });
-                } else {
-                    builder.ensure(Compiletest {
-                        mode: "debuginfo-gdb",
+            if mode == "debuginfo" {
+                return builder.ensure(Compiletest {
+                    mode: "debuginfo-both",
                     ..self
                 });
-                };
             }
 
             builder.ensure(dist::DebuggerScripts {

src/ci/run.sh

@@ -61,6 +61,7 @@ if [ "$DEPLOY$DEPLOY_ALT" != "" ]; then
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-llvm-assertions"
   elif [ "$DEPLOY_ALT" != "" ]; then
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-assertions"
+    RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.verify-llvm-ir"
   fi
 else
   # We almost always want debug assertions enabled, but sometimes this takes too
@@ -74,6 +75,8 @@ else
   if [ "$NO_LLVM_ASSERTIONS" = "" ]; then
     RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-assertions"
   fi
+
+  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.verify-llvm-ir"
 fi
 
 if [ "$RUST_RELEASE_CHANNEL" = "nightly" ] || [ "$DIST_REQUIRE_ALL_TOOLS" = "" ]; then

src/doc/rustc/src/command-line-arguments.md

@@ -10,6 +10,11 @@ This flag will print out help information for `rustc`.
 
 This flag can turn on or off various `#[cfg]` settings.
 
+The value can either be a single identifier or two identifiers separated by `=`.
+
+For examples, `--cfg 'verbose'` or `--cfg 'feature="serde"'`. These correspond
+to `#[cfg(verbose)]` and `#[cfg(feature = "serde")]` respectively.
+
 ## `-L`: add a directory to the library search path
 
 When looking for external crates, a directory passed to this flag will be searched.

src/liballoc/fmt.rs

@@ -335,8 +335,7 @@
 //!
 //! Each argument being formatted can be transformed by a number of formatting
 //! parameters (corresponding to `format_spec` in the syntax above). These
-//! parameters affect the string representation of what's being formatted. This
-//! syntax draws heavily from Python's, so it may seem a bit familiar.
+//! parameters affect the string representation of what's being formatted.
 //!
 //! ## Fill/Alignment
 //!

src/librustc/build.rs

@@ -8,8 +8,15 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use std::env;
+
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rerun-if-env-changed=CFG_LIBDIR_RELATIVE");
     println!("cargo:rerun-if-env-changed=CFG_COMPILER_HOST_TRIPLE");
+    println!("cargo:rerun-if-env-changed=RUSTC_VERIFY_LLVM_IR");
+
+    if env::var_os("RUSTC_VERIFY_LLVM_IR").is_some() {
+        println!("cargo:rustc-cfg=always_verify_llvm_ir");
+    }
 }

src/librustc/session/mod.rs

@@ -525,6 +525,7 @@ impl Session {
     }
     pub fn verify_llvm_ir(&self) -> bool {
         self.opts.debugging_opts.verify_llvm_ir
+            || cfg!(always_verify_llvm_ir)
     }
     pub fn borrowck_stats(&self) -> bool {
         self.opts.debugging_opts.borrowck_stats

src/librustc/ty/query/mod.rs

@@ -369,16 +369,16 @@ define_queries! { <'tcx>
             -> Lrc<specialization_graph::Graph>,
         [] fn is_object_safe: ObjectSafety(DefId) -> bool,
 
-        // Get the ParameterEnvironment for a given item; this environment
-        // will be in "user-facing" mode, meaning that it is suitabe for
-        // type-checking etc, and it does not normalize specializable
-        // associated types. This is almost always what you want,
-        // unless you are doing MIR optimizations, in which case you
-        // might want to use `reveal_all()` method to change modes.
+        /// Get the ParameterEnvironment for a given item; this environment
+        /// will be in "user-facing" mode, meaning that it is suitabe for
+        /// type-checking etc, and it does not normalize specializable
+        /// associated types. This is almost always what you want,
+        /// unless you are doing MIR optimizations, in which case you
+        /// might want to use `reveal_all()` method to change modes.
         [] fn param_env: ParamEnv(DefId) -> ty::ParamEnv<'tcx>,
 
-        // Trait selection queries. These are best used by invoking `ty.moves_by_default()`,
-        // `ty.is_copy()`, etc, since that will prune the environment where possible.
+        /// Trait selection queries. These are best used by invoking `ty.moves_by_default()`,
+        /// `ty.is_copy()`, etc, since that will prune the environment where possible.
         [] fn is_copy_raw: is_copy_dep_node(ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool,
         [] fn is_sized_raw: is_sized_dep_node(ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool,
         [] fn is_freeze_raw: is_freeze_dep_node(ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool,

src/librustc_codegen_llvm/builder.rs

@@ -756,7 +756,7 @@ impl Builder<'a, 'll, 'tcx> {
             // Ask LLVM to verify that the constraints are well-formed.
             let constraints_ok = llvm::LLVMRustInlineAsmVerify(fty, cons);
             debug!("Constraint verification result: {:?}", constraints_ok);
-            if constraints_ok == llvm::True {
+            if constraints_ok {
                 let v = llvm::LLVMRustInlineAsm(
                     fty, asm, cons, volatile, alignstack, dia);
                 Some(self.call(v, inputs, None))

src/librustc_codegen_llvm/debuginfo/create_scope_map.rs

@@ -37,7 +37,7 @@ pub struct MirDebugScope<'ll> {
 
 impl MirDebugScope<'ll> {
     pub fn is_valid(&self) -> bool {
-        !self.scope_metadata.is_none()
+        self.scope_metadata.is_some()
     }
 }
 

src/librustc_codegen_llvm/debuginfo/metadata.rs

@@ -163,10 +163,10 @@ impl TypeMap<'ll, 'tcx> {
     fn get_unique_type_id_of_type<'a>(&mut self, cx: &CodegenCx<'a, 'tcx>,
                                       type_: Ty<'tcx>) -> UniqueTypeId {
         // Let's see if we already have something in the cache
-        match self.type_to_unique_id.get(&type_).cloned() {
-            Some(unique_type_id) => return unique_type_id,
-            None => { /* generate one */}
-        };
+        if let Some(unique_type_id) = self.type_to_unique_id.get(&type_).cloned() {
+            return unique_type_id;
+        }
+        // if not, generate one
 
         // The hasher we are using to generate the UniqueTypeId. We want
         // something that provides more than the 64 bits of the DefaultHasher.
@@ -286,11 +286,11 @@ impl RecursiveTypeDescription<'ll, 'tcx> {
 // unique id can be found in the type map
 macro_rules! return_if_metadata_created_in_meantime {
     ($cx: expr, $unique_type_id: expr) => (
-        match debug_context($cx).type_map
+        if let Some(metadata) = debug_context($cx).type_map
             .borrow()
-                                .find_metadata_for_unique_id($unique_type_id) {
-            Some(metadata) => return MetadataCreationResult::new(metadata, true),
-            None => { /* proceed normally */ }
+            .find_metadata_for_unique_id($unique_type_id)
+        {
+            return MetadataCreationResult::new(metadata, true);
         }
     )
 }
@@ -352,15 +352,15 @@ fn vec_slice_metadata(
 
     let member_descriptions = vec![
         MemberDescription {
-            name: "data_ptr".to_string(),
+            name: "data_ptr".to_owned(),
             type_metadata: data_ptr_metadata,
             offset: Size::ZERO,
             size: pointer_size,
             align: pointer_align,
             flags: DIFlags::FlagZero,
         },
         MemberDescription {
-            name: "length".to_string(),
+            name: "length".to_owned(),
             type_metadata: type_metadata(cx, cx.tcx.types.usize, span),
             offset: pointer_size,
             size: usize_size,
@@ -458,7 +458,7 @@ fn trait_pointer_metadata(
     let vtable_field = layout.field(cx, 1);
     let member_descriptions = vec![
         MemberDescription {
-            name: "pointer".to_string(),
+            name: "pointer".to_owned(),
             type_metadata: type_metadata(cx,
                 cx.tcx.mk_mut_ptr(cx.tcx.types.u8),
                 syntax_pos::DUMMY_SP),
@@ -468,7 +468,7 @@ fn trait_pointer_metadata(
             flags: DIFlags::FlagArtificial,
         },
         MemberDescription {
-            name: "vtable".to_string(),
+            name: "vtable".to_owned(),
             type_metadata: type_metadata(cx, vtable_field.ty, syntax_pos::DUMMY_SP),
             offset: layout.fields.offset(1),
             size: vtable_field.size,
@@ -543,12 +543,12 @@ pub fn type_metadata(
             _ => {
                 let pointee_metadata = type_metadata(cx, ty, usage_site_span);
 
-                match debug_context(cx).type_map
+                if let Some(metadata) = debug_context(cx).type_map
                     .borrow()
-                                        .find_metadata_for_unique_id(unique_type_id) {
-                    Some(metadata) => return Err(metadata),
-                    None => { /* proceed normally */ }
-                };
+                    .find_metadata_for_unique_id(unique_type_id)
+                {
+                    return Err(metadata);
+                }
 
                 Ok(MetadataCreationResult::new(pointer_type_metadata(cx, t, pointee_metadata),
                    false))
@@ -603,12 +603,12 @@ pub fn type_metadata(
                                                        unique_type_id,
                                                        t.fn_sig(cx.tcx),
                                                        usage_site_span).metadata;
-            match debug_context(cx).type_map
+            if let Some(metadata) = debug_context(cx).type_map
                .borrow()
-                                   .find_metadata_for_unique_id(unique_type_id) {
-                Some(metadata) => return metadata,
-                None => { /* proceed normally */ }
-            };
+               .find_metadata_for_unique_id(unique_type_id)
+            {
+                return metadata;
+            }
 
             // This is actually a function pointer, so wrap it in pointer DI
             MetadataCreationResult::new(pointer_type_metadata(cx, t, fn_metadata), false)
@@ -1357,7 +1357,7 @@ fn describe_enum_variant(
             // We have the layout of an enum variant, we need the layout of the outer enum
             let enum_layout = cx.layout_of(layout.ty);
             (Some(enum_layout.fields.offset(0)),
-             Some(("RUST$ENUM$DISR".to_string(), enum_layout.field(cx, 0).ty)))
+             Some(("RUST$ENUM$DISR".to_owned(), enum_layout.field(cx, 0).ty)))
         }
         _ => (None, None),
     };
@@ -1471,9 +1471,8 @@ fn prepare_enum_metadata(
         }
     };
 
-    match (&layout.abi, discriminant_type_metadata) {
-        (&layout::Abi::Scalar(_), Some(discr)) => return FinalMetadata(discr),
-        _ => {}
+    if let (&layout::Abi::Scalar(_), Some(discr)) = (&layout.abi, discriminant_type_metadata) {
+        return FinalMetadata(discr);
     }
 
     let (enum_type_size, enum_type_align) = layout.size_and_align();
@@ -1546,7 +1545,7 @@ fn composite_type_metadata(
                                   composite_type_metadata,
                                   member_descriptions);
 
-    return composite_type_metadata;
+    composite_type_metadata
 }
 
 fn set_members_of_composite_type(cx: &CodegenCx<'ll, '_>,
@@ -1634,7 +1633,7 @@ fn create_struct_stub(
             unique_type_id.as_ptr())
     };
 
-    return metadata_stub;
+    metadata_stub
 }
 
 fn create_union_stub(
@@ -1670,7 +1669,7 @@ fn create_union_stub(
             unique_type_id.as_ptr())
     };
 
-    return metadata_stub;
+    metadata_stub
 }
 
 /// Creates debug information for the given global variable.

src/librustc_codegen_llvm/debuginfo/mod.rs

@@ -271,16 +271,14 @@ pub fn create_function_debug_context(
     let mut flags = DIFlags::FlagPrototyped;
 
     let local_id = cx.tcx.hir.as_local_node_id(def_id);
-    match *cx.sess().entry_fn.borrow() {
-        Some((id, _, _)) => {
+    if let Some((id, _, _)) = *cx.sess().entry_fn.borrow() {
         if local_id == Some(id) {
-                flags = flags | DIFlags::FlagMainSubprogram;
+            flags |= DIFlags::FlagMainSubprogram;
         }
     }
-        None => {}
-    };
+
     if cx.layout_of(sig.output()).abi.is_uninhabited() {
-        flags = flags | DIFlags::FlagNoReturn;
+        flags |= DIFlags::FlagNoReturn;
     }
 
     let fn_metadata = unsafe {
@@ -371,7 +369,7 @@ pub fn create_function_debug_context(
             }
         }
 
-        return create_DIArray(DIB(cx), &signature[..]);
+        create_DIArray(DIB(cx), &signature[..])
     }
 
     fn get_template_parameters(
@@ -428,7 +426,7 @@ pub fn create_function_debug_context(
             vec![]
         };
 
-        return create_DIArray(DIB(cx), &template_params[..]);
+        create_DIArray(DIB(cx), &template_params[..])
     }
 
     fn get_parameter_names(cx: &CodegenCx,

src/librustc_codegen_llvm/debuginfo/source_loc.rs

@@ -56,11 +56,8 @@ pub fn set_source_location(
 /// switches source location emitting on and must therefore be called before the
 /// first real statement/expression of the function is codegened.
 pub fn start_emitting_source_locations(dbg_context: &FunctionDebugContext<'ll>) {
-    match *dbg_context {
-        FunctionDebugContext::RegularContext(ref data) => {
-            data.source_locations_enabled.set(true)
-        },
-        _ => { /* safe to ignore */ }
+    if let FunctionDebugContext::RegularContext(ref data) = *dbg_context {
+        data.source_locations_enabled.set(true);
     }
 }
 

src/librustc_codegen_llvm/debuginfo/type_names.rs

@@ -40,7 +40,7 @@ impl ArchiveRO {
         return unsafe {
             let s = path2cstr(dst);
             let ar = super::LLVMRustOpenArchive(s.as_ptr()).ok_or_else(|| {
-                super::last_error().unwrap_or("failed to open archive".to_string())
+                super::last_error().unwrap_or("failed to open archive".to_owned())
             })?;
             Ok(ArchiveRO { raw: ar })
         };

src/librustc_codegen_llvm/llvm/archive_ro.rs

@@ -1213,7 +1213,7 @@ extern "C" {
                              -> &Value;
     pub fn LLVMRustInlineAsmVerify(Ty: &Type,
                                    Constraints: *const c_char)
-                             -> Bool;
+                                   -> bool;
 
     pub fn LLVMRustDebugMetadataVersion() -> u32;
     pub fn LLVMRustVersionMajor() -> u32;