tests: port symbol-mangling-hashed to rmake.rs

- Use `object` based test logic instead of processing `nm`
  human-readable textual output.
- Try to expand test coverage to not be limited to only linux + x86_64.

Co-authored-by: binarycat <[email protected]>

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -1,2 +1 @@
 run-make/split-debuginfo/Makefile
-run-make/symbol-mangling-hashed/Makefile

tests/run-make/symbol-mangling-hashed/default_bin.rs

@@ -0,0 +1,9 @@
+extern crate default_dylib;
+extern crate hashed_dylib;
+extern crate hashed_rlib;
+
+fn main() {
+    hashed_rlib::hrhello();
+    hashed_dylib::hdhello();
+    default_dylib::ddhello();
+}

tests/run-make/symbol-mangling-hashed/default_dylib.rs

@@ -0,0 +1,9 @@
+#![crate_type = "dylib"]
+
+extern crate hashed_dylib;
+extern crate hashed_rlib;
+
+pub fn ddhello() {
+    hashed_rlib::hrhello();
+    hashed_dylib::hdhello();
+}

tests/run-make/symbol-mangling-hashed/a_dylib.rs → tests/run-make/symbol-mangling-hashed/hashed_dylib.rs

@@ -1,4 +1,4 @@
 #![crate_type = "dylib"]
-pub fn hello() {
+pub fn hdhello() {
     println!("hello dylib");
 }

tests/run-make/symbol-mangling-hashed/a_rlib.rs → tests/run-make/symbol-mangling-hashed/hashed_rlib.rs

@@ -1,5 +1,5 @@
 #![crate_type = "rlib"]
 
-pub fn hello() {
+pub fn hrhello() {
     println!("hello rlib");
 }

tests/run-make/symbol-mangling-hashed/rmake.rs

@@ -0,0 +1,108 @@
+// ignore-tidy-linelength
+//! Basic smoke test for the unstable option `-C symbol_mangling_version=hashed` which aims to
+//! replace full symbol mangling names based on hash digests to shorten symbol name lengths in
+//! dylibs for space savings.
+//!
+//! # References
+//!
+//! - MCP #705: Provide option to shorten symbol names by replacing them with a digest:
+//!   <https://github.com/rust-lang/compiler-team/issues/705>.
+//! - Implementation PR: <https://github.com/rust-lang/rust/pull/118636>.
+//! - PE format: <https://learn.microsoft.com/en-us/windows/win32/debug/pe-format>.
+
+//@ ignore-cross-compile
+
+#![deny(warnings)]
+
+use run_make_support::symbols::exported_dynamic_symbol_names;
+use run_make_support::{bin_name, cwd, dynamic_lib_name, is_darwin, object, rfs, run, rustc};
+
+macro_rules! adjust_symbol_prefix {
+    ($name:literal) => {
+        if is_darwin() { concat!("_", $name) } else { $name }
+    };
+}
+
+fn main() {
+    rustc()
+        .input("hashed_dylib.rs")
+        .prefer_dynamic()
+        .arg("-Zunstable-options")
+        .symbol_mangling_version("hashed")
+        .metadata("foo")
+        .run();
+
+    rustc()
+        .input("hashed_rlib.rs")
+        .prefer_dynamic()
+        .arg("-Zunstable-options")
+        .symbol_mangling_version("hashed")
+        .metadata("bar")
+        .run();
+
+    rustc().input("default_dylib.rs").library_search_path(cwd()).prefer_dynamic().run();
+    rustc().input("default_bin.rs").library_search_path(cwd()).prefer_dynamic().run();
+
+    {
+        // Check hashed symbol name
+
+        let dylib_filename = dynamic_lib_name("hashed_dylib");
+        println!("checking dylib `{dylib_filename}`");
+
+        let dylib_blob = rfs::read(&dylib_filename);
+        let dylib_file = object::File::parse(&*dylib_blob)
+            .unwrap_or_else(|e| panic!("failed to parse `{dylib_filename}`: {e}"));
+
+        let dynamic_symbols = exported_dynamic_symbol_names(&dylib_file);
+
+        if dynamic_symbols.iter().filter(|sym| sym.contains("hdhello")).count() != 0 {
+            eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols);
+            panic!("expected no occurrence of `hdhello`");
+        }
+
+        let expected_prefix = adjust_symbol_prefix!("_RNxC12hashed_dylib");
+        if dynamic_symbols.iter().filter(|sym| sym.starts_with(expected_prefix)).count() != 2 {
+            eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols);
+            panic!("expected two dynamic symbols starting with `{expected_prefix}`");
+        }
+    }
+
+    {
+        let dylib_filename = dynamic_lib_name("default_dylib");
+        println!("checking so `{dylib_filename}`");
+
+        let dylib_blob = rfs::read(&dylib_filename);
+        let dylib_file = object::File::parse(&*dylib_blob)
+            .unwrap_or_else(|e| panic!("failed to parse `{dylib_filename}`: {e}"));
+
+        let dynamic_symbols = exported_dynamic_symbol_names(&dylib_file);
+
+        if dynamic_symbols
+            .iter()
+            .filter(|sym| sym.contains("default_dylib") && sym.contains("ddhello"))
+            .count()
+            != 1
+        {
+            eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols);
+            panic!("expected one occurrence of mangled `ddhello`");
+        }
+
+        let expected_rlib_prefix = adjust_symbol_prefix!("_RNxC11hashed_rlib");
+        if dynamic_symbols.iter().filter(|sym| sym.starts_with(expected_rlib_prefix)).count() != 2 {
+            eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols);
+            panic!("expected two exported symbols starting with `{expected_rlib_prefix}`");
+        }
+
+        let expected_dylib_prefix = adjust_symbol_prefix!("_RNxC12hashed_dylib");
+        if dynamic_symbols.iter().any(|sym| sym.starts_with("_RNxC12hashed_dylib")) {
+            eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols);
+            panic!("did not expect any symbols starting with `{expected_dylib_prefix}`");
+        }
+    }
+
+    // Check that the final binary can be run.
+    {
+        let bin_filename = bin_name("default_bin");
+        run(&bin_filename);
+    }
+}