Rollup merge of #92435 - bjorn3:sync_cg_clif-2021-12-30, r=bjorn3

Sync rustc_codegen_cranelift

The main highlight this sync is enforcing rustfmt and lack of warnings on cg_clif's CI. I will open a separate PR to remove the cg_clif exceptions for them from this repo.

r? `@ghost`

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

compiler/rustc_codegen_cranelift/.github/workflows/main.yml

@@ -5,6 +5,21 @@ on:
   - pull_request
 
 jobs:
+  rustfmt:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install rustfmt
+      run: |
+        rustup component add rustfmt
+
+    - name: Rustfmt
+      run: |
+        cargo fmt --check
+
   build:
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60

compiler/rustc_codegen_cranelift/.github/workflows/nightly-cranelift.yml

@@ -3,7 +3,7 @@ name: Test nightly Cranelift
 on:
   push:
   schedule:
-    - cron: '1 17 * * *' # At 01:17 UTC every day.
+    - cron: '17 1 * * *' # At 01:17 UTC every day.
 
 jobs:
   build:

compiler/rustc_codegen_cranelift/.gitignore

@@ -7,6 +7,7 @@ perf.data.old
 *.events
 *.string*
 /y.bin
+/y.bin.dSYM
 /build
 /build_sysroot/sysroot_src
 /build_sysroot/compiler-builtins

compiler/rustc_codegen_cranelift/Cargo.toml

@@ -40,31 +40,12 @@ unstable-features = ["jit", "inline_asm"]
 jit = ["cranelift-jit", "libloading"]
 inline_asm = []
 
-[profile.dev]
-# By compiling dependencies with optimizations, performing tests gets much faster.
-opt-level = 3
-
-[profile.dev.package.rustc_codegen_cranelift]
-# Disabling optimizations for cg_clif itself makes compilation after a change faster.
-opt-level = 0
-
-[profile.release.package.rustc_codegen_cranelift]
-incremental = true
-
 # Disable optimizations and debuginfo of build scripts and some of the heavy build deps, as the
 # execution time of build scripts is so fast that optimizing them slows down the total build time.
-[profile.dev.build-override]
-opt-level = 0
-debug = false
-
 [profile.release.build-override]
 opt-level = 0
 debug = false
 
-[profile.dev.package.cranelift-codegen-meta]
-opt-level = 0
-debug = false
-
 [profile.release.package.cranelift-codegen-meta]
 opt-level = 0
 debug = false

compiler/rustc_codegen_cranelift/Readme.md

@@ -37,7 +37,7 @@ Assuming `$cg_clif_dir` is the directory you cloned this repo into and you follo
 In the directory with your project (where you can do the usual `cargo build`), run:
 
 ```bash
-$ $cg_clif_dir/build/cargo build
+$ $cg_clif_dir/build/cargo-clif build
 ```
 
 This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.

compiler/rustc_codegen_cranelift/build_system/build_backend.rs

@@ -10,6 +10,18 @@ pub(crate) fn build_backend(
     let mut cmd = Command::new("cargo");
     cmd.arg("build").arg("--target").arg(host_triple);
 
+    cmd.env("CARGO_BUILD_INCREMENTAL", "true"); // Force incr comp even in release mode
+
+    let mut rustflags = env::var("RUSTFLAGS").unwrap_or_default();
+
+    if env::var("CI").as_ref().map(|val| &**val) == Ok("true") {
+        // Deny warnings on CI
+        rustflags += " -Dwarnings";
+
+        // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
+        cmd.env("CARGO_BUILD_INCREMENTAL", "false");
+    }
+
     if use_unstable_features {
         cmd.arg("--features").arg("unstable-features");
     }
@@ -22,25 +34,20 @@ pub(crate) fn build_backend(
         _ => unreachable!(),
     }
 
+    // Set the rpath to make the cg_clif executable find librustc_codegen_cranelift without changing
+    // LD_LIBRARY_PATH
     if cfg!(unix) {
         if cfg!(target_os = "macos") {
-            cmd.env(
-                "RUSTFLAGS",
-                "-Csplit-debuginfo=unpacked \
+            rustflags += " -Csplit-debuginfo=unpacked \
                 -Clink-arg=-Wl,-rpath,@loader_path/../lib \
-                -Zosx-rpath-install-name"
-                    .to_string()
-                    + env::var("RUSTFLAGS").as_deref().unwrap_or(""),
-            );
+                -Zosx-rpath-install-name";
         } else {
-            cmd.env(
-                "RUSTFLAGS",
-                "-Clink-arg=-Wl,-rpath=$ORIGIN/../lib ".to_string()
-                    + env::var("RUSTFLAGS").as_deref().unwrap_or(""),
-            );
+            rustflags += " -Clink-arg=-Wl,-rpath=$ORIGIN/../lib ";
         }
     }
 
+    cmd.env("RUSTFLAGS", rustflags);
+
     eprintln!("[BUILD] rustc_codegen_cranelift");
     crate::utils::spawn_and_wait(cmd);
 

compiler/rustc_codegen_cranelift/build_system/build_sysroot.rs

@@ -46,9 +46,9 @@ pub(crate) fn build_sysroot(
     // Build and copy cargo wrapper
     let mut build_cargo_wrapper_cmd = Command::new("rustc");
     build_cargo_wrapper_cmd
-        .arg("scripts/cargo.rs")
+        .arg("scripts/cargo-clif.rs")
         .arg("-o")
-        .arg(target_dir.join("cargo"))
+        .arg(target_dir.join("cargo-clif"))
         .arg("-g");
     spawn_and_wait(build_cargo_wrapper_cmd);
 

compiler/rustc_codegen_cranelift/docs/usage.md

@@ -9,7 +9,7 @@ Assuming `$cg_clif_dir` is the directory you cloned this repo into and you follo
 In the directory with your project (where you can do the usual `cargo build`), run:
 
 ```bash
-$ $cg_clif_dir/build/cargo build
+$ $cg_clif_dir/build/cargo-clif build
 ```
 
 This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
@@ -32,7 +32,7 @@ In jit mode cg_clif will immediately execute your code without creating an execu
 > The jit mode will probably need cargo integration to make this possible.
 
 ```bash
-$ $cg_clif_dir/build/cargo jit
+$ $cg_clif_dir/build/cargo-clif jit
 ```
 
 or
@@ -45,7 +45,7 @@ There is also an experimental lazy jit mode. In this mode functions are only com
 first called.
 
 ```bash
-$ $cg_clif_dir/build/cargo lazy-jit
+$ $cg_clif_dir/build/cargo-clif lazy-jit
 ```
 
 ## Shell

compiler/rustc_codegen_cranelift/example/mini_core_hello_world.rs

@@ -129,6 +129,7 @@ fn call_return_u128_pair() {
     return_u128_pair();
 }
 
+#[allow(unreachable_code)] // FIXME false positive
 fn main() {
     take_unique(Unique {
         pointer: 0 as *const (),

compiler/rustc_codegen_cranelift/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-12-20"
+channel = "nightly-2021-12-30"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]

compiler/rustc_codegen_cranelift/scripts/setup_rust_fork.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-./y.rs build
+./y.rs build --no-unstable-features
 source scripts/config.sh
 
 echo "[SETUP] Rust fork"

compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh

@@ -47,6 +47,8 @@ rm src/test/ui/codegen/init-large-type.rs # same
 rm src/test/ui/sse2.rs # cpuid not supported, so sse2 not detected
 rm src/test/ui/issues/issue-33992.rs # unsupported linkages
 rm src/test/ui/issues/issue-51947.rs # same
+rm src/test/incremental/hashes/function_interfaces.rs # same
+rm src/test/incremental/hashes/statics.rs # same
 rm src/test/ui/numbers-arithmetic/saturating-float-casts.rs # intrinsic gives different but valid result
 rm src/test/ui/mir/mir_misc_casts.rs # depends on deduplication of constants
 rm src/test/ui/mir/mir_raw_fat_ptr.rs # same
@@ -60,18 +62,14 @@ rm src/test/ui/intrinsics/intrinsic-nearby.rs # unimplemented nearbyintf32 and n
 
 rm src/test/incremental/hashes/inline_asm.rs # inline asm
 rm src/test/incremental/issue-72386.rs # same
-rm src/test/incremental/issue-49482.rs # same
-rm src/test/incremental/issue-54059.rs # same
 rm src/test/incremental/lto.rs # requires lto
+rm src/test/incremental/dirty_clean.rs # TODO
 
 rm -r src/test/run-make/emit-shared-files # requires the rustdoc executable in build/bin/
 rm -r src/test/run-make/unstable-flag-required # same
 rm -r src/test/run-make/rustdoc-* # same
 rm -r src/test/run-make/emit-named-files # requires full --emit support
 
-rm src/test/pretty/asm.rs # inline asm
-rm src/test/pretty/raw-str-nonexpr.rs # same
-
 rm -r src/test/run-pass-valgrind/unsized-locals
 
 rm src/test/ui/json-bom-plus-crlf-multifile.rs # differing warning
@@ -97,6 +95,12 @@ rm src/test/ui/command/command-current-dir.rs # can't find libstd.so
 
 rm src/test/ui/abi/stack-protector.rs # requires stack protector support
 
+rm src/test/incremental/issue-80691-bad-eval-cache.rs # wrong exit code
+rm src/test/incremental/spike-neg1.rs # errors out for some reason
+rm src/test/incremental/spike-neg2.rs # same
+
+rm src/test/incremental/thinlto/cgu_invalidated_when_import_{added,removed}.rs # requires LLVM
+
 echo "[TEST] rustc test suite"
-RUST_TEST_NOCAPTURE=1 COMPILETEST_FORCE_STAGE0=1 ./x.py test --stage 0 src/test/{codegen-units,run-make,run-pass-valgrind,ui}
+RUST_TEST_NOCAPTURE=1 COMPILETEST_FORCE_STAGE0=1 ./x.py test --stage 0 src/test/{codegen-units,run-make,run-pass-valgrind,ui,incremental}
 popd

compiler/rustc_codegen_cranelift/scripts/tests.sh

@@ -80,73 +80,73 @@ function base_sysroot_tests() {
 
 function extended_sysroot_tests() {
     pushd rand
-    ../build/cargo clean
+    ../build/cargo-clif clean
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
         echo "[TEST] rust-random/rand"
-        ../build/cargo test --workspace
+        ../build/cargo-clif test --workspace
     else
         echo "[AOT] rust-random/rand"
-        ../build/cargo build --workspace --target $TARGET_TRIPLE --tests
+        ../build/cargo-clif build --workspace --target $TARGET_TRIPLE --tests
     fi
     popd
 
     pushd simple-raytracer
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
         echo "[BENCH COMPILE] ebobby/simple-raytracer"
-        hyperfine --runs "${RUN_RUNS:-10}" --warmup 1 --prepare "../build/cargo clean" \
+        hyperfine --runs "${RUN_RUNS:-10}" --warmup 1 --prepare "../build/cargo-clif clean" \
         "RUSTC=rustc RUSTFLAGS='' cargo build" \
-        "../build/cargo build"
+        "../build/cargo-clif build"
 
         echo "[BENCH RUN] ebobby/simple-raytracer"
         cp ./target/debug/main ./raytracer_cg_clif
         hyperfine --runs "${RUN_RUNS:-10}" ./raytracer_cg_llvm ./raytracer_cg_clif
     else
-        ../build/cargo clean
+        ../build/cargo-clif clean
         echo "[BENCH COMPILE] ebobby/simple-raytracer (skipped)"
         echo "[COMPILE] ebobby/simple-raytracer"
-        ../build/cargo build --target $TARGET_TRIPLE
+        ../build/cargo-clif build --target $TARGET_TRIPLE
         echo "[BENCH RUN] ebobby/simple-raytracer (skipped)"
     fi
     popd
 
     pushd build_sysroot/sysroot_src/library/core/tests
     echo "[TEST] libcore"
-    ../../../../../build/cargo clean
+    ../../../../../build/cargo-clif clean
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
-        ../../../../../build/cargo test
+        ../../../../../build/cargo-clif test
     else
-        ../../../../../build/cargo build --target $TARGET_TRIPLE --tests
+        ../../../../../build/cargo-clif build --target $TARGET_TRIPLE --tests
     fi
     popd
 
     pushd regex
     echo "[TEST] rust-lang/regex example shootout-regex-dna"
-    ../build/cargo clean
+    ../build/cargo-clif clean
     export RUSTFLAGS="$RUSTFLAGS --cap-lints warn" # newer aho_corasick versions throw a deprecation warning
     # Make sure `[codegen mono items] start` doesn't poison the diff
-    ../build/cargo build --example shootout-regex-dna --target $TARGET_TRIPLE
+    ../build/cargo-clif build --example shootout-regex-dna --target $TARGET_TRIPLE
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
         cat examples/regexdna-input.txt \
-            | ../build/cargo run --example shootout-regex-dna --target $TARGET_TRIPLE \
+            | ../build/cargo-clif run --example shootout-regex-dna --target $TARGET_TRIPLE \
             | grep -v "Spawned thread" > res.txt
         diff -u res.txt examples/regexdna-output.txt
     fi
 
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
         echo "[TEST] rust-lang/regex tests"
-        ../build/cargo test --tests -- --exclude-should-panic --test-threads 1 -Zunstable-options -q
+        ../build/cargo-clif test --tests -- --exclude-should-panic --test-threads 1 -Zunstable-options -q
     else
         echo "[AOT] rust-lang/regex tests"
-        ../build/cargo build --tests --target $TARGET_TRIPLE
+        ../build/cargo-clif build --tests --target $TARGET_TRIPLE
     fi
     popd
 
     pushd portable-simd
     echo "[TEST] rust-lang/portable-simd"
-    ../build/cargo clean
-    ../build/cargo build --all-targets --target $TARGET_TRIPLE
+    ../build/cargo-clif clean
+    ../build/cargo-clif build --all-targets --target $TARGET_TRIPLE
     if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
-        ../build/cargo test -q
+        ../build/cargo-clif test -q
     fi
     popd
 }

compiler/rustc_codegen_cranelift/src/common.rs

@@ -237,7 +237,7 @@ pub(crate) struct FunctionCx<'m, 'clif, 'tcx: 'm> {
     pub(crate) module: &'m mut dyn Module,
     pub(crate) tcx: TyCtxt<'tcx>,
     pub(crate) target_config: TargetFrontendConfig, // Cached from module
-    pub(crate) pointer_type: Type, // Cached from module
+    pub(crate) pointer_type: Type,                  // Cached from module
     pub(crate) constants_cx: ConstantCx,
 
     pub(crate) instance: Instance<'tcx>,

compiler/rustc_codegen_cranelift/src/debuginfo/emit.rs

@@ -67,7 +67,7 @@ impl WriterRelocate {
     }
 
     /// Perform the collected relocations to be usable for JIT usage.
-    #[cfg(feature = "jit")]
+    #[cfg(all(feature = "jit", not(windows)))]
     pub(super) fn relocate_for_jit(mut self, jit_module: &cranelift_jit::JITModule) -> Vec<u8> {
         for reloc in self.relocs.drain(..) {
             match reloc.name {

compiler/rustc_codegen_cranelift/src/debuginfo/mod.rs

@@ -10,7 +10,7 @@ use crate::prelude::*;
 use rustc_index::vec::IndexVec;
 
 use cranelift_codegen::entity::EntityRef;
-use cranelift_codegen::ir::{LabelValueLoc, ValueLabel};
+use cranelift_codegen::ir::{Endianness, LabelValueLoc, ValueLabel};
 use cranelift_codegen::isa::TargetIsa;
 use cranelift_codegen::ValueLocRange;
 
@@ -23,15 +23,6 @@ use gimli::{Encoding, Format, LineEncoding, RunTimeEndian, X86_64};
 pub(crate) use emit::{DebugReloc, DebugRelocName};
 pub(crate) use unwind::UnwindContext;
 
-fn target_endian(tcx: TyCtxt<'_>) -> RunTimeEndian {
-    use rustc_target::abi::Endian;
-
-    match tcx.data_layout.endian {
-        Endian::Big => RunTimeEndian::Big,
-        Endian::Little => RunTimeEndian::Little,
-    }
-}
-
 pub(crate) struct DebugContext<'tcx> {
     tcx: TyCtxt<'tcx>,
 
@@ -60,6 +51,11 @@ impl<'tcx> DebugContext<'tcx> {
             address_size: isa.frontend_config().pointer_bytes(),
         };
 
+        let endian = match isa.endianness() {
+            Endianness::Little => RunTimeEndian::Little,
+            Endianness::Big => RunTimeEndian::Big,
+        };
+
         let mut dwarf = DwarfUnit::new(encoding);
 
         let producer = format!(
@@ -108,7 +104,7 @@ impl<'tcx> DebugContext<'tcx> {
         DebugContext {
             tcx,
 
-            endian: target_endian(tcx),
+            endian,
 
             dwarf,
             unit_range_list: RangeList(Vec::new()),