Optimize binary size

src/__private_api.rs

@@ -0,0 +1,236 @@
+use self::sealed::{LogKVs, LogLevel, LogTarget};
+use crate::{Level, LevelFilter, Metadata, Record};
+use std::cmp::Ordering;
+pub use std::convert::identity;
+use std::fmt::Arguments;
+use std::option::Option;
+pub use std::primitive::str;
+pub use std::{file, format_args, line, module_path, stringify};
+
+#[cfg(feature = "kv_unstable")]
+pub type LogKvValue<'a> = dyn crate::kv::value::ToValue + 'a;
+
+#[cfg(not(feature = "kv_unstable"))]
+pub type LogKvValue<'a> = str;
+
+mod sealed {
+    use crate::Level;
+
+    pub trait LogLevel {
+        fn into_log_level(self) -> Level;
+    }
+
+    pub trait LogTarget {
+        fn with<R>(self, module_path: &'static str, f: impl FnOnce(&str) -> R) -> R;
+    }
+
+    pub trait LogKVs {
+        fn with<R>(self, f: impl FnOnce(&[(&str, &super::LogKvValue)]) -> R) -> R;
+    }
+}
+
+// `LogLevel`.
+
+impl LogLevel for Level {
+    #[inline]
+    fn into_log_level(self) -> Level {
+        self
+    }
+}
+
+macro_rules! define_static_levels {
+    ($($ty:ident => $lvl:ident,)*) => {
+        $(
+            #[derive(Debug)]
+            pub struct $ty;
+
+            impl LogLevel for $ty {
+                #[inline]
+                fn into_log_level(self) -> Level {
+                    Level::$lvl
+                }
+            }
+
+            impl PartialEq<LevelFilter> for $ty {
+                #[inline]
+                fn eq(&self, other: &LevelFilter) -> bool {
+                    Level::$lvl.eq(other)
+                }
+            }
+
+            impl PartialOrd<LevelFilter> for $ty {
+                #[inline]
+                fn partial_cmp(&self, other: &LevelFilter) -> Option<Ordering> {
+                    Level::$lvl.partial_cmp(other)
+                }
+
+                #[inline]
+                fn lt(&self, other: &LevelFilter) -> bool {
+                    Level::$lvl.lt(other)
+                }
+
+                #[inline]
+                fn le(&self, other: &LevelFilter) -> bool {
+                    Level::$lvl.le(other)
+                }
+
+                #[inline]
+                fn gt(&self, other: &LevelFilter) -> bool {
+                    Level::$lvl.gt(other)
+                }
+
+                #[inline]
+                fn ge(&self, other: &LevelFilter) -> bool {
+                    Level::$lvl.ge(other)
+                }
+            }
+        )*
+    };
+}
+
+define_static_levels![
+    StaticLevelError => Error,
+    StaticLevelWarn => Warn,
+    StaticLevelInfo => Info,
+    StaticLevelDebug => Debug,
+    StaticLevelTrace => Trace,
+];
+
+// `LogTarget`.
+
+impl LogTarget for &str {
+    #[inline]
+    fn with<R>(self, _module_path: &'static str, f: impl FnOnce(&str) -> R) -> R {
+        f(self)
+    }
+}
+
+#[derive(Debug)]
+pub struct TargetIsModulePath;
+
+impl LogTarget for TargetIsModulePath {
+    #[inline]
+    fn with<R>(self, module_path: &'static str, f: impl FnOnce(&str) -> R) -> R {
+        f(module_path)
+    }
+}
+
+// `LogKVs`.
+
+impl LogKVs for &[(&str, &LogKvValue<'_>)] {
+    #[inline]
+    fn with<R>(self, f: impl FnOnce(&[(&str, &LogKvValue)]) -> R) -> R {
+        f(self)
+    }
+}
+
+#[derive(Debug)]
+pub struct EmptyKVs;
+
+impl LogKVs for EmptyKVs {
+    #[inline]
+    fn with<R>(self, f: impl FnOnce(&[(&str, &LogKvValue)]) -> R) -> R {
+        f(&[])
+    }
+}
+
+// Log functions.
+
+fn log_0(
+    module_path: &'static str,
+    file: &'static str,
+    line: u32,
+    args: Arguments,
+    level: Level,
+    target: &str,
+    kvs: &[(&str, &LogKvValue)],
+) {
+    #[cfg(not(feature = "kv_unstable"))]
+    if !kvs.is_empty() {
+        panic!(
+            "key-value support is experimental and must be enabled using the `kv_unstable` feature"
+        );
+    }
+
+    let mut builder = Record::builder();
+
+    builder
+        .args(args)
+        .level(level)
+        .target(target)
+        .module_path_static(Some(module_path))
+        .file_static(Some(file))
+        .line(Some(line));
+
+    #[cfg(feature = "kv_unstable")]
+    builder.key_values(&kvs);
+
+    crate::logger().log(&builder.build());
+}
+
+fn log_1<K>(
+    module_path: &'static str,
+    file: &'static str,
+    line: u32,
+    args: Arguments,
+    level: Level,
+    target: &str,
+    kvs: K,
+) where
+    K: LogKVs,
+{
+    kvs.with(|kvs| log_0(module_path, file, line, args, level, target, kvs));
+}
+
+fn log_2<T, K>(
+    module_path: &'static str,
+    file: &'static str,
+    line: u32,
+    args: Arguments,
+    level: Level,
+    target: T,
+    kvs: K,
+) where
+    T: LogTarget,
+    K: LogKVs,
+{
+    target.with(module_path, |target| {
+        log_1(
+            module_path,
+            file,
+            line,
+            args,
+            level.into_log_level(),
+            target,
+            kvs,
+        )
+    });
+}
+
+pub fn log<L, T, K>(
+    module_path: &'static str,
+    file: &'static str,
+    line: u32,
+    args: Arguments,
+    level: L,
+    target: T,
+    kvs: K,
+) where
+    L: LogLevel,
+    T: LogTarget,
+    K: LogKVs,
+{
+    log_2(
+        module_path,
+        file,
+        line,
+        args,
+        level.into_log_level(),
+        target,
+        kvs,
+    )
+}
+
+pub fn enabled(level: Level, target: &str) -> bool {
+    crate::logger().enabled(&Metadata::builder().level(level).target(target).build())
+}

src/lib.rs

@@ -1466,65 +1466,7 @@ pub fn logger() -> &'static dyn Log {
 
 // WARNING: this is not part of the crate's public API and is subject to change at any time
 #[doc(hidden)]
-#[cfg(not(feature = "kv_unstable"))]
-pub fn __private_api_log(
-    args: fmt::Arguments,
-    level: Level,
-    &(target, module_path, file, line): &(&str, &'static str, &'static str, u32),
-    kvs: Option<&[(&str, &str)]>,
-) {
-    if kvs.is_some() {
-        panic!(
-            "key-value support is experimental and must be enabled using the `kv_unstable` feature"
-        )
-    }
-
-    logger().log(
-        &Record::builder()
-            .args(args)
-            .level(level)
-            .target(target)
-            .module_path_static(Some(module_path))
-            .file_static(Some(file))
-            .line(Some(line))
-            .build(),
-    );
-}
-
-// WARNING: this is not part of the crate's public API and is subject to change at any time
-#[doc(hidden)]
-#[cfg(feature = "kv_unstable")]
-pub fn __private_api_log(
-    args: fmt::Arguments,
-    level: Level,
-    &(target, module_path, file, line): &(&str, &'static str, &'static str, u32),
-    kvs: Option<&[(&str, &dyn kv::ToValue)]>,
-) {
-    logger().log(
-        &Record::builder()
-            .args(args)
-            .level(level)
-            .target(target)
-            .module_path_static(Some(module_path))
-            .file_static(Some(file))
-            .line(Some(line))
-            .key_values(&kvs)
-            .build(),
-    );
-}
-
-// WARNING: this is not part of the crate's public API and is subject to change at any time
-#[doc(hidden)]
-pub fn __private_api_enabled(level: Level, target: &str) -> bool {
-    logger().enabled(&Metadata::builder().level(level).target(target).build())
-}
-
-// WARNING: this is not part of the crate's public API and is subject to change at any time
-#[doc(hidden)]
-pub mod __private_api {
-    pub use std::option::Option;
-    pub use std::{file, format_args, line, module_path, stringify};
-}
+pub mod __private_api;
 
 /// The statically resolved maximum log level.
 ///