Auto merge of #119221 - matthiaskrgr:rollup-dh9exqf, r=matthiaskrgr

Rollup of 5 pull requests

Successful merges:

 - #117601 (Add support for hexagon-unknown-none-elf as target)
 - #119169 (Rid the AST & HIR pretty printer of cruft)
 - #119194 (Run fuchsia tests only on nightly)
 - #119201 (tests: fix overaligned-constant to not over-specify getelementptr instr)
 - #119215 (Emits error if has bound regions)

r? `@ghost`
`@rustbot` modify labels: rollup

4 files changed, 273 insertions, 0 deletions

diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 800d8920951..3af370bf006 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -471,6 +471,11 @@ jobs:
             <<: *job-linux-4c
 
           - name: x86_64-gnu-integration
+            env:
+              # Only run this job on the nightly channel. Fuchsia requires
+              # nightly features to compile, and this job would fail if
+              # executed on beta and stable.
+              CI_ONLY_WHEN_CHANNEL: nightly
             <<: *job-linux-16c
 
           - name: x86_64-gnu-debug
diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md
index fadd64a0353..1c8e1d1e316 100644
--- a/src/doc/rustc/src/SUMMARY.md
+++ b/src/doc/rustc/src/SUMMARY.md
@@ -38,6 +38,7 @@
     - [\*-unknown-fuchsia](platform-support/fuchsia.md)
     - [\*-kmc-solid_\*](platform-support/kmc-solid.md)
     - [csky-unknown-linux-gnuabiv2\*](platform-support/csky-unknown-linux-gnuabiv2.md)
+    - [hexagon-unknown-none-elf](platform-support/hexagon-unknown-none-elf.md)
     - [loongarch\*-unknown-linux-\*](platform-support/loongarch-linux.md)
     - [loongarch\*-unknown-none\*](platform-support/loongarch-none.md)
     - [m68k-unknown-linux-gnu](platform-support/m68k-unknown-linux-gnu.md)
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 59ef7441024..78c041ee511 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -265,6 +265,7 @@ target | std | host | notes
 `bpfel-unknown-none` | * |  | BPF (little endian)
 `csky-unknown-linux-gnuabiv2` | ✓ |  | C-SKY abiv2 Linux (little endian)
 `csky-unknown-linux-gnuabiv2hf` | ✓ |  | C-SKY abiv2 Linux, hardfloat (little endian)
+[`hexagon-unknown-none-elf`](platform-support/hexagon-unknown-none-elf.md)| * | Bare Hexagon (v60+, HVX)
 `hexagon-unknown-linux-musl` | ? |  |
 `i386-apple-ios` | ✓ |  | 32-bit x86 iOS [^x86_32-floats-return-ABI]
 [`i586-pc-nto-qnx700`](platform-support/nto-qnx.md) | * |  | 32-bit x86 QNX Neutrino 7.0 RTOS  [^x86_32-floats-return-ABI]
diff --git a/src/doc/rustc/src/platform-support/hexagon-unknown-none-elf.md b/src/doc/rustc/src/platform-support/hexagon-unknown-none-elf.md
new file mode 100644
index 00000000000..06423f0f8fa
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/hexagon-unknown-none-elf.md
@@ -0,0 +1,266 @@
+# `hexagon-unknown-none-elf`
+
+**Tier: 3**
+
+Rust for baremetal Hexagon DSPs.
+
+| Target                   | Descriptions                              |
+| ------------------------ | ----------------------------------------- |
+| hexagon-unknown-none-elf | Hexagon 32-bit (freestanding, hardfloat)  |
+
+## Target maintainers
+
+- [Brian Cain](https://github.com/androm3da), `bcain@quicinc.com`
+
+## Requirements
+
+This target is cross-compiled.  There is no support for `std`. There is no
+default allocator, but it's possible to use `alloc` by supplying an allocator.
+
+By default, code generated with this target should run on Hexagon DSP hardware.
+
+- `-Ctarget-cpu=hexagonv73` adds support for instructions defined up to Hexagon V73.
+
+Functions marked `extern "C"` use the [Hexagon architecture calling convention](https://lists.llvm.org/pipermail/llvm-dev/attachments/20190916/21516a52/attachment-0001.pdf).
+
+This target generates PIC ELF binaries.
+
+## Building the target
+
+You can build Rust with support for the target by adding it to the `target`
+list in `config.toml`:
+
+```toml
+[build]
+build-stage = 1
+host = ["<target for your host>"]
+target = ["<target for your host>", "hexagon-unknown-none-elf"]
+
+[target.hexagon-unknown-none-elf]
+
+cc = "hexagon-unknown-none-elf-clang"
+cxx = "hexagon-unknown-none-elf-clang++"
+linker = "hexagon-unknown-none-elf-clang"
+llvm-libunwind = 'in-tree'
+```
+
+Replace `<target for your host>` with `x86_64-unknown-linux-gnu` or whatever
+else is appropriate for your host machine.
+
+## Building Rust programs
+
+Rust does not yet ship pre-compiled artifacts for this target. To compile for
+this target, you will either need to build Rust with the target enabled (see
+"Building the target" above), or build your own copy of `core` by using
+`build-std` or similar.
+
+## Testing
+
+Since `hexagon-unknown-none-elf` supports a variety of different environments and
+does not support `std`, this target does not support running the Rust test suite.
+
+## Cross-compilation toolchains and C code
+
+This target has been tested using `qemu-system-hexagon`.
+
+A common use case for `hexagon-unknown-none-elf` is building libraries that
+link against C code and can be used in emulation or on a device with a
+Hexagon DSP.
+
+The Hexagon SDK has libraries which are useful to link against when running
+on a device.
+
+
+# Standalone OS
+
+The script below will build an executable against "hexagon standalone OS"
+which is suitable for emulation or bare-metal on-device testing.
+
+First, run `cargo new --bin demo1_hexagon` then add the source below as
+`src/main.rs`.  This program demonstrates the console output via semihosting.
+
+```rust,ignore (platform-specific,eh-personality-is-unstable)
+#![no_std]
+#![no_main]
+
+extern "C" {
+    fn putchar(ch: i32);
+    fn _exit(code: i32) -> !;
+}
+
+#[no_mangle]
+extern "C" fn main() -> i32 {
+    let message = "Hello, this is Rust!";
+    for b in message.bytes() {
+        unsafe {
+            putchar(b as i32);
+        }
+    }
+    0
+}
+
+#[panic_handler]
+fn panic(_panic: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        _exit(1);
+    }
+}
+
+```
+
+Next, save the script below as `build.sh` and edit it to suit your
+environment.
+
+* `hex_toolchain` below refers to the [hexagon toolchain using exclusively
+public open source repos](https://github.com/quic/toolchain_for_hexagon/releases).
+* `cc` below refers to clang.  You can use `clang` from your distribution, as
+long as it's at least `clang-17`.  Or you can use
+`hexagon-unknown-none-elf-clang` from one of the [hexagon open source toolchain
+releases](https://github.com/quic/toolchain_for_hexagon/releases).
+
+```sh
+# Hexagon SDK, required for target libraries:
+hex_sdk_root=/local/mnt/workspace/Qualcomm/Hexagon_SDK/5.3.0.0
+hex_sdk_toolchain=${hex_sdk_root}/tools/HEXAGON_Tools/8.6.06
+
+sdk_libs=${hex_sdk_toolchain}/Tools/target/hexagon/lib
+q6_arch=v65
+g0_lib_path=${sdk_libs}/${q6_arch}/G0
+pic_lib_path=${sdk_libs}/${q6_arch}/G0/pic
+
+cargo build --target=hexagon-unknown-none-elf -Zbuild-std
+
+# Builds an executable against "hexagon standalone OS" suitable for emulation:
+${cc} --target=hexagon-unknown-none-elf -o testit \
+    -fuse-ld=lld \
+    -m${q6_arch} \
+    -nodefaultlibs \
+    -nostartfiles \
+    ${g0_lib_path}/crt0_standalone.o \
+    ${g0_lib_path}/crt0.o \
+    ${g0_lib_path}/init.o \
+    -L${sdk_libs}/${q6_arch}/ \
+    -L${sdk_libs}/ \
+    testit.c \
+    target/hexagon-unknown-none-elf/debug/libmin_ex_lib_lin.rlib \
+    target/hexagon-unknown-none-elf/debug/deps/libcore-*.rlib \
+    target/hexagon-unknown-none-elf/debug/deps/libcompiler_builtins-*.rlib \
+    -Wl,--start-group \
+    -Wl,--defsym,_SDA_BASE_=0,--defsym,__sbss_start=0,--defsym,__sbss_end=0 \
+    -lstandalone \
+    ${g0_lib_path}/libc.a \
+    -lgcc \
+    -lc_eh \
+    -Wl,--end-group \
+    ${g0_lib_path}/fini.o \
+
+${hex_toolchain}/x86_64-linux-gnu/bin/qemu-system-hexagon -monitor none -display none -kernel ./testit
+```
+
+# QuRT OS
+
+First, run `cargo new --lib demo2_hexagon` then add the source below as
+`src/lib.rs`.  This program demonstrates inline assembly and console output
+via semihosting.
+
+```rust,ignore (platform-specific,eh-personality-is-unstable)
+#![no_std]
+#![no_main]
+#![feature(lang_items)]
+#![feature(asm_experimental_arch)]
+
+use core::arch::asm;
+
+extern "C" {
+    fn putchar(ch: i32);
+    fn _exit(code: i32) -> !;
+}
+
+fn hexagon_specific() {
+    let mut buffer = [0_u8; 128];
+
+    unsafe {
+        let mut x = &buffer;
+        asm!(
+                "{{\n\t",
+                "  v0=vmem({addr}+#0)\n\t",
+                "  {tmp} = and({tmp}, #1)\n\t",
+                "}}\n\t",
+                addr = in(reg) x,
+                tmp = out(reg) _,
+            );
+    }
+}
+
+#[no_mangle]
+extern "C" fn hello() -> i32 {
+    let message = "Hello, this is Rust!\n";
+    for b in message.bytes() {
+        unsafe {
+            putchar(b as i32);
+        }
+    }
+    hexagon_specific();
+    0
+}
+
+#[panic_handler]
+fn panic(_panic: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        _exit(1);
+    }
+}
+
+#[lang = "eh_personality"]
+fn rust_eh_personality() {}
+
+```
+
+Next, save the script below as `build.sh` and edit it to suit your
+environment.  The script below will build a shared object against the QuRT
+RTOS which is suitable for emulation or on-device testing when loaded via
+the fastrpc-shell.
+
+
+```sh
+# Hexagon SDK, required for target libraries:
+hex_sdk_root=/local/mnt/workspace/Qualcomm/Hexagon_SDK/5.3.0.0
+hex_sdk_toolchain=${hex_sdk_root}/tools/HEXAGON_Tools/8.6.06
+
+sdk_libs=${hex_sdk_toolchain}/Tools/target/hexagon/lib
+q6_arch=v65
+g0_lib_path=${sdk_libs}/${q6_arch}/G0
+pic_lib_path=${sdk_libs}/${q6_arch}/G0/pic
+runelf=${hex_sdk_root}/rtos/qurt/computev65/sdksim_bin/runelf.pbn
+rmohs=${hex_sdk_root}/libs/run_main_on_hexagon/ship/hexagon_toolv86_${q6_arch}/run_main_on_hexagon_sim
+
+# Builds a library suitable for loading into "run_main_on_hexagon_sim" for
+# emulation or frpc shell on real target:
+${cc} --target=hexagon-unknown-none-elf -o testit.so \
+    -fuse-ld=lld \
+    -fPIC -shared \
+    -nostdlib \
+    -Wl,-Bsymbolic \
+      -Wl,--wrap=malloc \
+      -Wl,--wrap=calloc \
+      -Wl,--wrap=free \
+      -Wl,--wrap=realloc \
+      -Wl,--wrap=memalign \
+    -m${q6_arch} \
+    testit.c \
+    target/hexagon-unknown-none-elf/debug/libmin_ex_lib_lin.rlib \
+    target/hexagon-unknown-none-elf/debug/deps/libcore-*.rlib \
+    target/hexagon-unknown-none-elf/debug/deps/libcompiler_builtins-*.rlib \
+    -Wl,-soname=testit \
+    ${pic_lib_path}/libc.so
+
+# -Bsymbolic above for memory alloc funcs is necessary to access the heap on
+# target, but otherwise not required.
+
+# multi-stage loader: runelf => run_main_on_hexagon_sim => testit.so{`main`}
+${hex_toolchain}/x86_64-linux-gnu/bin/qemu-system-hexagon \
+    -monitor none \
+    -display none \
+    -kernel ${runelf} \
+    -append "${rmohs} -- ./testit.so"
+```