Rollup merge of #124280 - beetrees:repr128-test-rmake, r=jieyouxu

Port repr128-dwarf run-make test to rmake

This PR ports the repr128-dwarf run-make test to rmake, using the `gimli` crate instead of the `llvm-dwarfdump` command.

Note that this PR changes `rmake.rs` files to be compiled with the 2021 edition (previously no edition was passed to `rustc`, meaning they were compiled with the 2015 edition). This means that `panic!("{variable}")` will now work as expected in `rmake.rs` files (there's already a usage in the [wasm-symbols-not-exported test](https://github.com/rust-lang/rust/blob/aca749eefceaed0cda19a7ec5e472fce9387bc00/tests/run-make/wasm-symbols-not-exported/rmake.rs#L34) that this will fix).

Tracking issue: #121876

Cargo.lock

@@ -3318,6 +3318,7 @@ dependencies = [
 name = "run_make_support"
 version = "0.0.0"
 dependencies = [
+ "gimli",
  "object 0.34.0",
  "regex",
  "similar",

src/tools/compiletest/src/runtest.rs

@@ -3825,6 +3825,7 @@ impl<'test> TestCx<'test> {
             .arg(format!("-Ldependency={}", &support_lib_deps_deps.to_string_lossy()))
             .arg("--extern")
             .arg(format!("run_make_support={}", &support_lib_path.to_string_lossy()))
+            .arg("--edition=2021")
             .arg(&self.testpaths.file.join("rmake.rs"))
             .env("TARGET", &self.config.target)
             .env("PYTHON", &self.config.python)

src/tools/run-make-support/Cargo.toml

@@ -8,3 +8,4 @@ object = "0.34.0"
 similar = "2.5.0"
 wasmparser = "0.118.2"
 regex = "1.8" # 1.8 to avoid memchr 2.6.0, as 2.5.0 is pinned in the workspace
+gimli = "0.28.1"

src/tools/run-make-support/src/lib.rs

@@ -15,6 +15,7 @@ use std::env;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output};
 
+pub use gimli;
 pub use object;
 pub use regex;
 pub use wasmparser;

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -235,7 +235,6 @@ run-make/relocation-model/Makefile
 run-make/relro-levels/Makefile
 run-make/remap-path-prefix-dwarf/Makefile
 run-make/remap-path-prefix/Makefile
-run-make/repr128-dwarf/Makefile
 run-make/reproducible-build-2/Makefile
 run-make/reproducible-build/Makefile
 run-make/resolve-rename/Makefile

tests/run-make/repr128-dwarf/lib.rs → tests/run-make/repr128-dwarf/main.rs

@@ -1,4 +1,3 @@
-#![crate_type = "lib"]
 #![feature(repr128)]
 
 // Use .to_le() to ensure that the bytes are in the same order on both little- and big-endian
@@ -21,3 +20,7 @@ pub enum I128Enum {
 }
 
 pub fn f(_: U128Enum, _: I128Enum) {}
+
+fn main() {
+    f(U128Enum::U128A, I128Enum::I128A);
+}

tests/run-make/repr128-dwarf/rmake.rs

@@ -0,0 +1,75 @@
+//@ ignore-windows
+// This test should be replaced with one in tests/debuginfo once GDB or LLDB support 128-bit enums.
+
+extern crate run_make_support;
+
+use gimli::{AttributeValue, Dwarf, EndianRcSlice, Reader, RunTimeEndian};
+use object::{Object, ObjectSection};
+use run_make_support::{gimli, object, rustc, tmp_dir};
+use std::borrow::Cow;
+use std::collections::HashMap;
+use std::rc::Rc;
+
+fn main() {
+    let output = tmp_dir().join("repr128");
+    rustc().input("main.rs").arg("-o").arg(&output).arg("-Cdebuginfo=2").run();
+    // Mach-O uses packed debug info
+    let dsym_location = output
+        .with_extension("dSYM")
+        .join("Contents")
+        .join("Resources")
+        .join("DWARF")
+        .join("repr128");
+    let output =
+        std::fs::read(if dsym_location.try_exists().unwrap() { dsym_location } else { output })
+            .unwrap();
+    let obj = object::File::parse(output.as_slice()).unwrap();
+    let endian = if obj.is_little_endian() { RunTimeEndian::Little } else { RunTimeEndian::Big };
+    let dwarf = gimli::Dwarf::load(|section| -> Result<_, ()> {
+        let data = obj.section_by_name(section.name()).map(|s| s.uncompressed_data().unwrap());
+        Ok(EndianRcSlice::new(Rc::from(data.unwrap_or_default().as_ref()), endian))
+    })
+    .unwrap();
+    let mut iter = dwarf.units();
+    let mut still_to_find = HashMap::from([
+        ("U128A", 0_u128),
+        ("U128B", 1_u128),
+        ("U128C", u64::MAX as u128 + 1),
+        ("U128D", u128::MAX),
+        ("I128A", 0_i128 as u128),
+        ("I128B", (-1_i128) as u128),
+        ("I128C", i128::MIN as u128),
+        ("I128D", i128::MAX as u128),
+    ]);
+    while let Some(header) = iter.next().unwrap() {
+        let unit = dwarf.unit(header).unwrap();
+        let mut cursor = unit.entries();
+        while let Some((_, entry)) = cursor.next_dfs().unwrap() {
+            if entry.tag() == gimli::constants::DW_TAG_enumerator {
+                let name = dwarf
+                    .attr_string(
+                        &unit,
+                        entry.attr(gimli::constants::DW_AT_name).unwrap().unwrap().value(),
+                    )
+                    .unwrap();
+                let name = name.to_string().unwrap();
+                if let Some(expected) = still_to_find.remove(name.as_ref()) {
+                    match entry.attr(gimli::constants::DW_AT_const_value).unwrap().unwrap().value()
+                    {
+                        AttributeValue::Block(value) => {
+                            assert_eq!(
+                                value.to_slice().unwrap(),
+                                expected.to_le_bytes().as_slice(),
+                                "{name}"
+                            );
+                        }
+                        value => panic!("{name}: unexpected DW_AT_const_value of {value:?}"),
+                    }
+                }
+            }
+        }
+    }
+    if !still_to_find.is_empty() {
+        panic!("Didn't find debug entries for {still_to_find:?}");
+    }
+}