micro-level optimizations for bootstrap

Overall optimizations for bootstrap on conditions, assertions,
trait implementations, etc.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

9 files changed, 60 insertions, 77 deletions

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index b3666192853..7e0f3ccae0b 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -523,7 +523,7 @@ impl<'a> ShouldRun<'a> {
                 .iter()
                 .map(|p| {
                     // assert only if `p` isn't submodule
-                    if !submodules_paths.iter().find(|sm_p| p.contains(*sm_p)).is_some() {
+                    if submodules_paths.iter().find(|sm_p| p.contains(*sm_p)).is_none() {
                         assert!(
                             self.builder.src.join(p).exists(),
                             "`should_run.paths` should correspond to real on-disk paths - use `alias` if there is no relevant path: {}",
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 9c68e5a78d8..2686a8c1752 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -876,10 +876,8 @@ impl Step for Rustc {
                     cargo.rustflag("-Clto=off");
                 }
             }
-        } else {
-            if builder.config.rust_lto == RustcLto::Off {
-                cargo.rustflag("-Clto=off");
-            }
+        } else if builder.config.rust_lto == RustcLto::Off {
+            cargo.rustflag("-Clto=off");
         }
 
         for krate in &*self.crates {
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index e5fdac3ceda..176ef8e92db 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -322,33 +322,23 @@ pub struct RustfmtMetadata {
     pub version: String,
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 pub enum RustfmtState {
     SystemToolchain(PathBuf),
     Downloaded(PathBuf),
     Unavailable,
+    #[default]
     LazyEvaluated,
 }
 
-impl Default for RustfmtState {
-    fn default() -> Self {
-        RustfmtState::LazyEvaluated
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq)]
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
 pub enum LlvmLibunwind {
+    #[default]
     No,
     InTree,
     System,
 }
 
-impl Default for LlvmLibunwind {
-    fn default() -> Self {
-        Self::No
-    }
-}
-
 impl FromStr for LlvmLibunwind {
     type Err = String;
 
@@ -362,19 +352,14 @@ impl FromStr for LlvmLibunwind {
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Default, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum SplitDebuginfo {
     Packed,
     Unpacked,
+    #[default]
     Off,
 }
 
-impl Default for SplitDebuginfo {
-    fn default() -> Self {
-        SplitDebuginfo::Off
-    }
-}
-
 impl std::str::FromStr for SplitDebuginfo {
     type Err = ();
 
@@ -1529,7 +1514,7 @@ impl Config {
             let asserts = llvm_assertions.unwrap_or(false);
             config.llvm_from_ci = match llvm.download_ci_llvm {
                 Some(StringOrBool::String(s)) => {
-                    assert!(s == "if-available", "unknown option `{s}` for download-ci-llvm");
+                    assert_eq!(s, "if-available", "unknown option `{s}` for download-ci-llvm");
                     crate::llvm::is_ci_llvm_available(&config, asserts)
                 }
                 Some(StringOrBool::Bool(b)) => b,
diff --git a/src/bootstrap/config/tests.rs b/src/bootstrap/config/tests.rs
index b8f3be96062..aac76cdcbcf 100644
--- a/src/bootstrap/config/tests.rs
+++ b/src/bootstrap/config/tests.rs
@@ -136,7 +136,7 @@ build-config = {}
         "setting string value without quotes"
     );
     assert_eq!(config.gdb, Some("bar".into()), "setting string value with quotes");
-    assert_eq!(config.deny_warnings, false, "setting boolean value");
+    assert!(!config.deny_warnings, "setting boolean value");
     assert_eq!(
         config.tools,
         Some(["cargo".to_string()].into_iter().collect()),
@@ -181,13 +181,13 @@ fn profile_user_dist() {
 
 #[test]
 fn rust_optimize() {
-    assert_eq!(parse("").rust_optimize.is_release(), true);
-    assert_eq!(parse("rust.optimize = false").rust_optimize.is_release(), false);
-    assert_eq!(parse("rust.optimize = true").rust_optimize.is_release(), true);
-    assert_eq!(parse("rust.optimize = 0").rust_optimize.is_release(), false);
-    assert_eq!(parse("rust.optimize = 1").rust_optimize.is_release(), true);
+    assert!(parse("").rust_optimize.is_release());
+    assert!(!parse("rust.optimize = false").rust_optimize.is_release());
+    assert!(parse("rust.optimize = true").rust_optimize.is_release());
+    assert!(!parse("rust.optimize = 0").rust_optimize.is_release());
+    assert!(parse("rust.optimize = 1").rust_optimize.is_release());
+    assert!(parse("rust.optimize = \"s\"").rust_optimize.is_release());
     assert_eq!(parse("rust.optimize = 1").rust_optimize.get_opt_level(), Some("1".to_string()));
-    assert_eq!(parse("rust.optimize = \"s\"").rust_optimize.is_release(), true);
     assert_eq!(parse("rust.optimize = \"s\"").rust_optimize.get_opt_level(), Some("s".to_string()));
 }
 
diff --git a/src/bootstrap/download.rs b/src/bootstrap/download.rs
index 17c308e915b..80845af3b9a 100644
--- a/src/bootstrap/download.rs
+++ b/src/bootstrap/download.rs
@@ -441,7 +441,7 @@ impl Config {
     }
 
     pub(crate) fn download_beta_toolchain(&self) {
-        self.verbose(&format!("downloading stage0 beta artifacts"));
+        self.verbose("downloading stage0 beta artifacts");
 
         let date = &self.stage0_metadata.compiler.date;
         let version = &self.stage0_metadata.compiler.version;
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 4396bbc51a3..644f61549b8 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -116,7 +116,7 @@ pub const VERSION: usize = 2;
 
 /// Extra --check-cfg to add when building
 /// (Mode restriction, config name, config values (if any))
-const EXTRA_CHECK_CFGS: &[(Option<Mode>, &'static str, Option<&[&'static str]>)] = &[
+const EXTRA_CHECK_CFGS: &[(Option<Mode>, &str, Option<&[&'static str]>)] = &[
     (None, "bootstrap", None),
     (Some(Mode::Rustc), "parallel_compiler", None),
     (Some(Mode::ToolRustc), "parallel_compiler", None),
@@ -1757,10 +1757,11 @@ to download LLVM rather than building it.
         //
         // In these cases we automatically enable Ninja if we find it in the
         // environment.
-        if !self.config.ninja_in_file && self.config.build.contains("msvc") {
-            if cmd_finder.maybe_have("ninja").is_some() {
-                return true;
-            }
+        if !self.config.ninja_in_file
+            && self.config.build.contains("msvc")
+            && cmd_finder.maybe_have("ninja").is_some()
+        {
+            return true;
         }
 
         self.config.ninja_in_file
diff --git a/src/bootstrap/llvm.rs b/src/bootstrap/llvm.rs
index c841cb34036..ab2967bb8cc 100644
--- a/src/bootstrap/llvm.rs
+++ b/src/bootstrap/llvm.rs
@@ -148,7 +148,7 @@ pub(crate) fn detect_llvm_sha(config: &Config, is_git: bool) -> String {
         "".to_owned()
     };
 
-    if &llvm_sha == "" {
+    if llvm_sha.is_empty() {
         eprintln!("error: could not find commit hash for downloading LLVM");
         eprintln!("help: maybe your repository history is too shallow?");
         eprintln!("help: consider disabling `download-ci-llvm`");
@@ -201,10 +201,10 @@ pub(crate) fn is_ci_llvm_available(config: &Config, asserts: bool) -> bool {
         ("x86_64-unknown-netbsd", false),
     ];
 
-    if !supported_platforms.contains(&(&*config.build.triple, asserts)) {
-        if asserts == true || !supported_platforms.contains(&(&*config.build.triple, true)) {
-            return false;
-        }
+    if !supported_platforms.contains(&(&*config.build.triple, asserts))
+        && (asserts || !supported_platforms.contains(&(&*config.build.triple, true)))
+    {
+        return false;
     }
 
     if is_ci_llvm_modified(config) {
@@ -490,11 +490,11 @@ impl Step for Llvm {
             let mut cmd = Command::new(&res.llvm_config);
             let version = output(cmd.arg("--version"));
             let major = version.split('.').next().unwrap();
-            let lib_name = match &llvm_version_suffix {
+
+            match &llvm_version_suffix {
                 Some(version_suffix) => format!("libLLVM-{major}{version_suffix}.{extension}"),
                 None => format!("libLLVM-{major}.{extension}"),
-            };
-            lib_name
+            }
         };
 
         // When building LLVM with LLVM_LINK_LLVM_DYLIB for macOS, an unversioned
@@ -749,13 +749,15 @@ fn configure_cmake(
 
     // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
     // We also do this if the user explicitly requested static libstdc++.
-    if builder.config.llvm_static_stdcpp {
-        if !target.contains("msvc") && !target.contains("netbsd") && !target.contains("solaris") {
-            if target.contains("apple") || target.contains("windows") {
-                ldflags.push_all("-static-libstdc++");
-            } else {
-                ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
-            }
+    if builder.config.llvm_static_stdcpp
+        && !target.contains("msvc")
+        && !target.contains("netbsd")
+        && !target.contains("solaris")
+    {
+        if target.contains("apple") || target.contains("windows") {
+            ldflags.push_all("-static-libstdc++");
+        } else {
+            ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
         }
     }
 
diff --git a/src/bootstrap/sanity.rs b/src/bootstrap/sanity.rs
index 7e83b508e94..0e1c855ea3e 100644
--- a/src/bootstrap/sanity.rs
+++ b/src/bootstrap/sanity.rs
@@ -92,20 +92,19 @@ pub fn check(build: &mut Build) {
                     .unwrap_or(true)
             })
             .any(|build_llvm_ourselves| build_llvm_ourselves);
+
     let need_cmake = building_llvm || build.config.any_sanitizers_enabled();
-    if need_cmake {
-        if cmd_finder.maybe_have("cmake").is_none() {
-            eprintln!(
-                "
+    if need_cmake && cmd_finder.maybe_have("cmake").is_none() {
+        eprintln!(
+            "
 Couldn't find required command: cmake
 
 You should install cmake, or set `download-ci-llvm = true` in the
 `[llvm]` section of `config.toml` to download LLVM rather
 than building it.
 "
-            );
-            crate::exit!(1);
-        }
+        );
+        crate::exit!(1);
     }
 
     build.config.python = build
@@ -199,10 +198,10 @@ than building it.
             .entry(*target)
             .or_insert_with(|| Target::from_triple(&target.triple));
 
-        if target.contains("-none-") || target.contains("nvptx") {
-            if build.no_std(*target) == Some(false) {
-                panic!("All the *-none-* and nvptx* targets are no-std targets")
-            }
+        if (target.contains("-none-") || target.contains("nvptx"))
+            && build.no_std(*target) == Some(false)
+        {
+            panic!("All the *-none-* and nvptx* targets are no-std targets")
         }
 
         // Make sure musl-root is valid
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index d1018978f78..e3a0580b2cc 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1139,16 +1139,14 @@ help: to skip test's attempt to check tidiness, pass `--skip src/tools/tidy` to
             .map(|filename| builder.src.join("src/etc/completions").join(filename));
         if builder.config.cmd.bless() {
             builder.ensure(crate::run::GenerateCompletions);
-        } else {
-            if crate::flags::get_completion(shells::Bash, &bash).is_some()
-                || crate::flags::get_completion(shells::Fish, &fish).is_some()
-                || crate::flags::get_completion(shells::PowerShell, &powershell).is_some()
-            {
-                eprintln!(
-                    "x.py completions were changed; run `x.py run generate-completions` to update them"
-                );
-                crate::exit!(1);
-            }
+        } else if crate::flags::get_completion(shells::Bash, &bash).is_some()
+            || crate::flags::get_completion(shells::Fish, &fish).is_some()
+            || crate::flags::get_completion(shells::PowerShell, &powershell).is_some()
+        {
+            eprintln!(
+                "x.py completions were changed; run `x.py run generate-completions` to update them"
+            );
+            crate::exit!(1);
         }
     }
 
@@ -1372,7 +1370,7 @@ impl Step for MirOpt {
         let run = |target| {
             builder.ensure(Compiletest {
                 compiler: self.compiler,
-                target: target,
+                target,
                 mode: "mir-opt",
                 suite: "mir-opt",
                 path: "tests/mir-opt",