Merge pull request #141 from rust-osdev/dev

treewide: code improvements and other stuff

Author: phip1611

.github/workflows/_build-rust.yml

@@ -80,27 +80,27 @@ jobs:
           key: ${{ runner.os }}-rust-${{ inputs.rust-version }}-cargo-${{ hashFiles('**/Cargo.toml', '**/Cargo.lock') }}
       - run: cargo version
       - name: Build (library)
-        run: cargo build --target ${{ inputs.rust-target }} --features ${{ inputs.features }}
+        run: cargo build --target ${{ inputs.rust-target }} --features ${{ inputs.features }} --no-default-features
       - name: Build (all targets)
-        run: cargo build --all-targets --features ${{ inputs.features }}
+        run: cargo build --all-targets --features ${{ inputs.features }} --no-default-features
       - name: Code Formatting
         if: inputs.do-style-check
         run: cargo fmt --all -- --check
       - name: Code Style and Doc Style
         if: inputs.do-style-check
         run: |
-          cargo doc --document-private-items --features ${{ inputs.features }}
-          cargo clippy --all-targets --features ${{ inputs.features }}
+          cargo doc --document-private-items --features ${{ inputs.features }} --no-default-features
+          cargo clippy --all-targets --features ${{ inputs.features }} --no-default-features
       - name: Unit Test (UNIX)
         if: inputs.do-test && runner.os != 'Windows'
         run: |
           curl -LsSf https://get.nexte.st/latest/linux | tar zxf -
           chmod u+x cargo-nextest
-          ./cargo-nextest nextest run --features ${{ inputs.features }}
+          ./cargo-nextest nextest run --features ${{ inputs.features }} --no-default-features
       - name: Unit Test (Windows)
         if: inputs.do-test && runner.os == 'Windows'
         run: |
           Invoke-WebRequest https://get.nexte.st/latest/windows -OutFile cargo-nextest.zip
           Expand-Archive .\cargo-nextest.zip
           cp .\cargo-nextest/cargo-nextest.exe .
-          .\cargo-nextest.exe nextest run --features ${{ inputs.features }}
+          .\cargo-nextest.exe nextest run --features ${{ inputs.features }} --no-default-features

.github/workflows/rust.yml

@@ -20,33 +20,36 @@ jobs:
     name: build (msrv)
     uses: ./.github/workflows/_build-rust.yml
     with:
-      rust-version: 1.56.1
+      rust-version: 1.68.0 # MSRV
       do-style-check: false
+      features: builder
 
   build_stable:
     name: build (stable)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: stable
       do-style-check: false
+      features: builder
 
   build_nightly:
     name: build (nightly)
     uses: ./.github/workflows/_build-rust.yml
     with:
       rust-version: nightly
       do-style-check: false
-      features: unstable
+      features: builder,unstable
 
   ### no-std Build   #########################
   build_nostd_msrv:
     name: build no_std (msrv)
     needs: build_msrv
     uses: ./.github/workflows/_build-rust.yml
     with:
-      rust-version: 1.56.1
+      rust-version: 1.68.0 # MSRV
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
+      features: builder
 
   build_nostd_stable:
     name: build no_std (stable)
@@ -56,6 +59,17 @@ jobs:
       rust-version: stable
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
+      features: builder
+
+  # Also tests the build one time without the "builder" feature.
+  build_nostd_stable_no_builder:
+    name: build no_std (stable) [w/o builder]
+    needs: build_stable
+    uses: ./.github/workflows/_build-rust.yml
+    with:
+      rust-version: stable
+      do-style-check: false
+      rust-target: thumbv7em-none-eabihf
 
   # We perform one single run also in Windows. This should be sufficient to
   # check that devs can also use this on Windows.
@@ -65,11 +79,12 @@ jobs:
     with:
       runs-on: windows-latest
       # Quirk for the Windows powershell and its handling of empty arguments.
-      features: >
-        '""'
+      # features: >
+      #   '""'
       rust-version: stable
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
+      features: builder
 
   build_nostd_nightly:
     name: build no_std (nightly)
@@ -79,17 +94,18 @@ jobs:
       rust-version: nightly
       do-style-check: false
       rust-target: thumbv7em-none-eabihf
-      features: unstable
+      features: builder,unstable
 
   ### Style Checks + Doc #####################
   style_msrv:
     name: style (msrv)
     needs: build_msrv
     uses: ./.github/workflows/_build-rust.yml
     with:
-      rust-version: 1.56.1
+      rust-version: 1.68.0 # MSRV
       do-style-check: true
       do-test: false
+      features: builder
 
   style_stable:
     name: style (stable)
@@ -99,6 +115,7 @@ jobs:
       rust-version: stable
       do-style-check: true
       do-test: false
+      features: builder
 
   style_nightly:
     name: style (nightly)
@@ -108,4 +125,4 @@ jobs:
       rust-version: nightly
       do-style-check: true
       do-test: false
-      features: unstable
+      features: builder,unstable

Cargo.lock

@@ -26,12 +26,18 @@ readme = "README.md"
 homepage = "https://github.com/rust-osdev/multiboot2-header"
 repository = "https://github.com/rust-osdev/multiboot2"
 documentation = "https://docs.rs/multiboot2-header"
+rust-version = "1.60"
+
+[[example]]
+name = "minimal"
+required-features = ["builder"]
 
 [features]
-# by default, builder is included
 default = ["builder"]
-std = []
-builder = ["std"]
+alloc = []
+builder = ["alloc"]
+# Nightly-only features, which will eventually be stabilized.
+unstable = []
 
 [dependencies]
 # used for MBI tags

multiboot2-header/Cargo.toml

@@ -1,7 +1,10 @@
 # CHANGELOG for crate `multiboot2-header`
 
 ## Unreleased
-- MSRV is 1.56.1
+- MSRV is 1.68.0
+- renamed the `std` feature to `alloc`
+- added the optional `unstable` feature (requires nightly)
+  - implement `core::error::Error` for `LoadError`
 
 ## v0.2.0 (2022-05-03)
 - **BREAKING** renamed `EntryHeaderTag` to `EntryAddressHeaderTag`

multiboot2-header/Changelog.md

@@ -15,10 +15,11 @@ What this library is good for:
 What this library is not optimal for:
 - compiling a Multiboot2 header statically into an object file using only Rust code
 
-## Features and Usage in `no_std`
-This library is always `no_std`. However, the `builder`-feature requires the `alloc`-crate
-to be available. You need the `builder` only if you want to construct new headers. For parsing,
-this is not relevant.
+## Features and `no_std` Compatibility
+This library is always `no_std`. However, the default `builder`-feature requires
+the `alloc`-crate to be available. You need the `builder` only if you want to
+construct new headers at run time. For parsing, this is not relevant, and you
+can deactivate the default feature.
 
 ```toml
 # without `builder`-feature (and without `alloc`-crate)

multiboot2-header/README.md

@@ -5,6 +5,7 @@ use crate::{
     EntryAddressHeaderTag, EntryEfi32HeaderTag, EntryEfi64HeaderTag, FramebufferHeaderTag,
     InformationRequestHeaderTag, ModuleAlignHeaderTag, Multiboot2BasicHeader, RelocatableHeaderTag,
 };
+use alloc::vec::Vec;
 use core::mem::size_of;
 
 /// Trait for all tags that helps to create a byte array from the tag.
@@ -24,13 +25,10 @@ pub(crate) trait StructAsBytes: Sized {
 
     /// Returns the structure as a vector of its bytes.
     /// The length is determined by [`Self::byte_size`].
-    fn struct_as_bytes(&self) -> alloc::vec::Vec<u8> {
+    fn struct_as_bytes(&self) -> Vec<u8> {
         let ptr = self.as_ptr();
-        let mut vec = alloc::vec::Vec::with_capacity(self.byte_size());
-        for i in 0..self.byte_size() {
-            vec.push(unsafe { *ptr.add(i) })
-        }
-        vec
+        let bytes = unsafe { core::slice::from_raw_parts(ptr, self.byte_size()) };
+        Vec::from(bytes)
     }
 }
 

multiboot2-header/src/builder/traits.rs

@@ -5,7 +5,7 @@ use crate::{
     RelocatableHeaderTag,
 };
 use core::convert::TryInto;
-use core::fmt::{Debug, Formatter};
+use core::fmt::{Debug, Display, Formatter};
 use core::mem::size_of;
 
 /// Magic value for a [`Multiboot2Header`], as defined in spec.
@@ -212,6 +212,15 @@ pub enum LoadError {
     TooSmall,
 }
 
+impl Display for LoadError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
+#[cfg(feature = "unstable")]
+impl core::error::Error for LoadError {}
+
 /// **Use this only if you know what you do. You probably want to use
 /// [`Multiboot2Header`] instead.**
 ///

multiboot2-header/src/header.rs

@@ -34,6 +34,7 @@
 //! The MSRV is 1.56.1 stable.
 
 #![no_std]
+#![cfg_attr(feature = "unstable", feature(error_in_core))]
 #![deny(rustdoc::all)]
 #![deny(clippy::all)]
 #![deny(clippy::missing_const_for_fn)]
@@ -77,6 +78,5 @@ pub use self::relocatable::*;
 pub use self::tags::*;
 pub use self::uefi_bs::*;
 
-/// Re-export of [`multiboot2::TagType`] from `multiboot2`-crate as `MbiTagType`, i.e. tags that
-/// describe the entries in the Multiboot2 Information Structure (MBI).
+/// Re-export of [`multiboot2::TagType`] from `multiboot2`-crate.
 pub use multiboot2::TagType as MbiTagType;

multiboot2-header/src/lib.rs

@@ -23,24 +23,26 @@ keywords = [
     "Multiboot2",
     "kernel",
     "boot",
+    "bootloader",
 ]
 # without this, sometimes crates.io doesn't show the preview of the README
 # I expeciended this multiple times in the past
 readme = "README.md"
 homepage = "https://github.com/rust-osdev/multiboot2"
 repository = "https://github.com/rust-osdev/multiboot2"
 documentation = "https://docs.rs/multiboot2"
+rust-version = "1.60"
 
 [features]
-# by default, builder is included
 default = ["builder"]
-std = []
-builder = ["std"]
-# Nightly-only features that will eventually be stabilized.
+alloc = []
+builder = ["alloc"]
+# Nightly-only features, which will eventually be stabilized.
 unstable = []
 
 [dependencies]
-bitflags = "1"
+bitflags = "2"
 derive_more = { version = "0.99", default-features = false, features = ["display"] }
 log = { version = "0.4", default-features = false }
+uefi-raw = { version = "0.2.0", default-features = false }
 ptr_meta = { version = "0.2.0", default-features = false }