Auto merge of #95338 - bjorn3:sync_cg_gcc-2022-03-26, r=antoyo

Sync rustc_codegen_gcc

r? `@ghost`

`@rustbot` label +A-codegen +A-gcc +T-compiler

cc `@antoyo`

compiler/rustc_codegen_gcc/.github/workflows/main.yml → compiler/rustc_codegen_gcc/.github/workflows/ci.yml

@@ -10,30 +10,43 @@ jobs:
 
     strategy:
       fail-fast: false
+      matrix:
+        libgccjit_version: ["libgccjit.so", "libgccjit_without_int128.so"]
 
     steps:
     - uses: actions/checkout@v2
 
+    - uses: actions/checkout@v2
+      with:
+        repository: llvm/llvm-project
+        path: llvm
+
     - name: Install packages
       run: sudo apt-get install ninja-build ripgrep
 
     - name: Download artifact
       uses: dawidd6/action-download-artifact@v2
       with:
           workflow: main.yml
-          name: libgccjit.so
+          name: ${{ matrix.libgccjit_version }}
           path: gcc-build
           repo: antoyo/gcc
+          search_artifacts: true # Because, instead, the action only check the last job ran and that won't work since we want multiple artifacts.
 
     - name: Setup path to libgccjit
       run: |
           echo $(readlink -f gcc-build) > gcc_path
+          # NOTE: the filename is still libgccjit.so even when the artifact name is different.
           ln gcc-build/libgccjit.so gcc-build/libgccjit.so.0
 
-    - name: Set LIBRARY_PATH
+    - name: Set env
       run: |
         echo "LIBRARY_PATH=$(cat gcc_path)" >> $GITHUB_ENV
         echo "LD_LIBRARY_PATH=$(cat gcc_path)" >> $GITHUB_ENV
+        echo "workspace="$GITHUB_WORKSPACE >> $GITHUB_ENV
+
+    - name: Set RUST_COMPILER_RT_ROOT
+      run: echo "RUST_COMPILER_RT_ROOT="${{ env.workspace }}/llvm/compiler-rt >> $GITHUB_ENV
 
     # https://github.com/actions/cache/issues/133
     - name: Fixup owner of ~/.cargo/

compiler/rustc_codegen_gcc/.gitignore

@@ -18,3 +18,4 @@ gimple*
 res
 test-backend
 gcc_path
+benchmarks

compiler/rustc_codegen_gcc/Cargo.lock

@@ -41,15 +41,15 @@ dependencies = [
 [[package]]
 name = "gccjit"
 version = "1.0.0"
-source = "git+https://github.com/antoyo/gccjit.rs#0672b78d162d65b6f36ea4062947253affe9fdef"
+source = "git+https://github.com/antoyo/gccjit.rs#bdecdecfb8a02ec861a39a350f990faa33bd31c3"
 dependencies = [
  "gccjit_sys",
 ]
 
 [[package]]
 name = "gccjit_sys"
 version = "0.0.1"
-source = "git+https://github.com/antoyo/gccjit.rs#0672b78d162d65b6f36ea4062947253affe9fdef"
+source = "git+https://github.com/antoyo/gccjit.rs#bdecdecfb8a02ec861a39a350f990faa33bd31c3"
 dependencies = [
  "libc 0.1.12",
 ]

compiler/rustc_codegen_gcc/Readme.md

@@ -21,6 +21,8 @@ You can also use my [fork of gcc](https://github.com/antoyo/gcc) which already i
 ```bash
 $ git clone https://github.com/rust-lang/rustc_codegen_gcc.git
 $ cd rustc_codegen_gcc
+$ git clone https://github.com/llvm/llvm-project llvm --depth 1 --single-branch
+$ export RUST_COMPILER_RT_ROOT="$PWD/llvm/compiler-rt"
 $ ./prepare_build.sh # download and patch sysroot src
 $ ./build.sh --release
 ```
@@ -109,6 +111,13 @@ Or add a breakpoint to `add_error` in gdb and print the line number using:
 
 ```
 p loc->m_line
+p loc->m_filename->m_buffer
+```
+
+To print a debug representation of a tree:
+
+```c
+debug_tree(expr);
 ```
 
 To get the `rustc` command to run in `gdb`, add the `--verbose` flag to `cargo build`.
@@ -134,4 +143,5 @@ To get the `rustc` command to run in `gdb`, add the `--verbose` flag to `cargo b
  * Set `linker='-Clinker=m68k-linux-gcc'`.
  * Set the path to the cross-compiling libgccjit in `gcc_path`.
  * Disable the 128-bit integer types if the target doesn't support them by using `let i128_type = context.new_type::<i64>();` in `context.rs` (same for u128_type).
+ * Comment the line: `context.add_command_line_option("-masm=intel");` in src/base.rs.
  * (might not be necessary) Disable the compilation of libstd.so (and possibly libcore.so?).

compiler/rustc_codegen_gcc/build.sh

@@ -3,7 +3,27 @@
 #set -x
 set -e
 
-if [ -f ./gcc_path ]; then 
+codegen_channel=debug
+sysroot_channel=debug
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --release)
+            codegen_channel=release
+            shift
+            ;;
+        --release-sysroot)
+            sysroot_channel=release
+            shift
+            ;;
+        *)
+            echo "Unknown option $1"
+            exit 1
+            ;;
+    esac
+done
+
+if [ -f ./gcc_path ]; then
     export GCC_PATH=$(cat gcc_path)
 else
     echo 'Please put the path to your custom build of libgccjit in the file `gcc_path`, see Readme.md for details'
@@ -13,13 +33,21 @@ fi
 export LD_LIBRARY_PATH="$GCC_PATH"
 export LIBRARY_PATH="$GCC_PATH"
 
-if [[ "$1" == "--release" ]]; then
+features=
+
+if [[ "$1" == "--features" ]]; then
+    shift
+    features="--features $1"
+    shift
+fi
+
+if [[ "$codegen_channel" == "release" ]]; then
     export CHANNEL='release'
-    CARGO_INCREMENTAL=1 cargo rustc --release
+    CARGO_INCREMENTAL=1 cargo rustc --release $features
 else
     echo $LD_LIBRARY_PATH
     export CHANNEL='debug'
-    cargo rustc
+    cargo rustc $features
 fi
 
 source config.sh
@@ -28,4 +56,9 @@ rm -r target/out || true
 mkdir -p target/out/gccjit
 
 echo "[BUILD] sysroot"
-time ./build_sysroot/build_sysroot.sh $CHANNEL
+if [[ "$sysroot_channel" == "release" ]]; then
+    time ./build_sysroot/build_sysroot.sh --release
+else
+    time ./build_sysroot/build_sysroot.sh
+fi
+

compiler/rustc_codegen_gcc/build_sysroot/build_sysroot.sh

@@ -22,7 +22,7 @@ if [[ "$1" == "--release" ]]; then
     RUSTFLAGS="$RUSTFLAGS -Zmir-opt-level=3" cargo build --target $TARGET_TRIPLE --release
 else
     sysroot_channel='debug'
-    cargo build --target $TARGET_TRIPLE
+    cargo build --target $TARGET_TRIPLE --features compiler_builtins/c
 fi
 
 # Copy files to sysroot

compiler/rustc_codegen_gcc/cargo.sh

@@ -8,7 +8,7 @@ pushd $(dirname "$0") >/dev/null
 source config.sh
 
 # read nightly compiler from rust-toolchain file
-TOOLCHAIN=$(cat rust-toolchain)
+TOOLCHAIN=$(cat rust-toolchain | grep channel | sed 's/channel = "\(.*\)"/\1/')
 
 popd >/dev/null
 

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -14,6 +14,9 @@ unsafe extern "C" fn _Unwind_Resume() {
 #[lang = "sized"]
 pub trait Sized {}
 
+#[lang = "destruct"]
+pub trait Destruct {}
+
 #[lang = "unsize"]
 pub trait Unsize<T: ?Sized> {}
 
@@ -59,6 +62,7 @@ unsafe impl Copy for i16 {}
 unsafe impl Copy for i32 {}
 unsafe impl Copy for isize {}
 unsafe impl Copy for f32 {}
+unsafe impl Copy for f64 {}
 unsafe impl Copy for char {}
 unsafe impl<'a, T: ?Sized> Copy for &'a T {}
 unsafe impl<T: ?Sized> Copy for *const T {}
@@ -443,12 +447,22 @@ pub trait Deref {
     fn deref(&self) -> &Self::Target;
 }
 
+pub trait Allocator {
+}
+
+pub struct Global;
+
+impl Allocator for Global {}
+
 #[lang = "owned_box"]
-pub struct Box<T: ?Sized>(*mut T);
+pub struct Box<
+    T: ?Sized,
+    A: Allocator = Global,
+>(*mut T, A);
 
 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T> {}
 
-impl<T: ?Sized> Drop for Box<T> {
+impl<T: ?Sized, A: Allocator> Drop for Box<T, A> {
     fn drop(&mut self) {
         // drop is currently performed by compiler.
     }
@@ -468,7 +482,7 @@ unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
 }
 
 #[lang = "box_free"]
-unsafe fn box_free<T: ?Sized>(ptr: *mut T) {
+unsafe fn box_free<T: ?Sized, A: Allocator>(ptr: *mut T, alloc: A) {
     libc::free(ptr as *mut u8);
 }
 

compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch

@@ -22,7 +22,7 @@ index 0000000..46fd999
 +[package]
 +name = "core"
 +version = "0.0.0"
-+edition = "2018"
++edition = "2021"
 +
 +[lib]
 +name = "coretests"

compiler/rustc_codegen_gcc/patches/0023-core-Ignore-failing-tests.patch

@@ -46,24 +46,4 @@ index 4bc44e9..8e3c7a4 100644
 
  #[test]
  fn cell_allows_array_cycle() {
-diff --git a/library/core/tests/slice.rs b/library/core/tests/slice.rs
-index 3e00e0a..8e5663b 100644
---- a/library/core/tests/slice.rs
-+++ b/library/core/tests/slice.rs
-@@ -2108,6 +2108,7 @@ fn test_copy_within_panics_src_out_of_bounds() {
-     bytes.copy_within(usize::MAX..=usize::MAX, 0);
- }
-
-+/*
- #[test]
- fn test_is_sorted() {
-     let empty: [i32; 0] = [];
-@@ -2122,6 +2123,7 @@ fn test_is_sorted() {
-     assert!(!["c", "bb", "aaa"].is_sorted());
-     assert!(["c", "bb", "aaa"].is_sorted_by_key(|s| s.len()));
- }
-+*/
-
- #[test]
- fn test_slice_run_destructors() {
 -- 2.21.0 (Apple Git-122)