Fix compilation of embench

The separation did not work before, somehow.
The new approach of redefining the function names, while hacky, definitely works though.

benchmark_all.sh

@@ -1,3 +1,5 @@
+set -e
+
 cargo build --workspace --release
 
 echo "Disabling turbo..."

client/build.rs

@@ -44,70 +44,57 @@ fn main() {
     let embench_dir = PathBuf::from_str(&format!("{out_dir}/embench-iot")).unwrap();
 
     let mut generated_code = String::new();
-    let mut benchmark_functions = vec![];
 
     for &benchmark_file in BENCHMARKS {
         let path = embench_dir.join(benchmark_file);
         let dir = path.parent().unwrap();
-        let benchmark_name = dir.file_name().unwrap().to_string_lossy();
-        let (wrapper_path, function_name) = make_wrapper(&benchmark_name, &out_dir);
-        cc::Build::new()
+        let benchmark_name = dir.file_name().unwrap().to_string_lossy().replace("-", "_");
+        println!("cargo:warning={path:?}");
+
+        let mut build = cc::Build::new();
+        build
             .include(embench_dir.join("support"))
-            .include(dir)
+            .file(embench_dir.join("support/beebsc.c"))
             .file(&path)
-            .file(&wrapper_path)
-            .define("CPU_MHZ", "2700") // FIXME: Use correct CPU frequency
-            .compile(&format!("libembench_{benchmark_name}.a"));
+            // Just use some roughly accurate value, it just influences how long each benchmark runs
+            .define("CPU_MHZ", "2700");
+
+        // Rename all functions that are defined multiple times to avoid collisions
+        let colliding_functions = [
+            "benchmark",
+            "initialise_benchmark",
+            "warm_caches",
+            "verify_benchmark",
+        ];
+        for name in colliding_functions {
+            build.define(name, format!("{benchmark_name}_{name}").as_str());
+        }
+
+        build.compile(&format!("libembench_{benchmark_name}.a"));
 
         write!(
             generated_code,
             r#"
+            #[allow(non_camel_case_types)] pub struct {benchmark_name};
+
             unsafe extern "C" {{
-                fn {function_name}();
-            }}"#
-        )
-        .unwrap();
-        benchmark_functions.push(function_name);
-    }
+                fn {benchmark_name}_benchmark();
+                fn {benchmark_name}_initialise_benchmark();
+            }}
 
-    writeln!(
-        generated_code,
-        "#[allow(non_camel_case_types)] #[derive(Clone, Copy)] pub enum Benchmark {{"
-    )
-    .unwrap();
-    for benchmark_name in &benchmark_functions {
-        writeln!(generated_code, "    {benchmark_name},").unwrap();
-    }
-    writeln!(generated_code, "}}").unwrap();
+            impl Benchmark for {benchmark_name} {{
+                unsafe fn init() {{
+                    unsafe {{ {benchmark_name}_initialise_benchmark(); }}
+                }}
 
-    writeln!(generated_code, "pub unsafe fn run(benchmark: Benchmark) {{").unwrap();
-    writeln!(generated_code, "match benchmark {{").unwrap();
-    for benchmark_name in benchmark_functions {
-        writeln!(
-            generated_code,
-            "    Benchmark::{benchmark_name} => unsafe {{ {benchmark_name}() }},"
+                unsafe fn benchmark() {{
+                    unsafe {{ {benchmark_name}_benchmark(); }}
+                }}
+            }}
+            "#
         )
         .unwrap();
     }
-    writeln!(generated_code, "}}").unwrap();
-    writeln!(generated_code, "}}").unwrap();
 
     fs::write(format!("{out_dir}/libembench-sys.rs"), generated_code).unwrap();
 }
-
-fn make_wrapper(benchmark_name: &str, out_dir: &str) -> (PathBuf, String) {
-    let benchmark_name = benchmark_name.replace("-", "_");
-    let function_name = format!("benchmark_{benchmark_name}");
-    let code = format!(
-        r#"
-        extern int benchmark(void);
-
-        void {function_name}(void) {{
-            benchmark();
-        }}
-    "#
-    );
-    let path = PathBuf::from(out_dir).join(format!("{benchmark_name}_wrapper.c"));
-    fs::write(&path, code).unwrap();
-    (path, function_name)
-}

client/src/bin/client_combined.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_sglib_combined);
+    program::<client::embench_sys::sglib_combined>();
 }

client/src/bin/client_crc_32.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_crc32);
+    program::<client::embench_sys::crc32>();
 }

client/src/bin/client_edn.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_edn);
+    program::<client::embench_sys::edn>();
 }

client/src/bin/client_huffbench.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_huffbench);
+    program::<client::embench_sys::huffbench>();
 }

client/src/bin/client_matmult-int.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_matmult_int);
+    program::<client::embench_sys::matmult_int>();
 }

client/src/bin/client_md5.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_md5sum);
+    program::<client::embench_sys::md5sum>();
 }

client/src/bin/client_minver.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_minver);
+    program::<client::embench_sys::minver>();
 }

client/src/bin/client_mont64.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_aha_mont64);
+    program::<client::embench_sys::aha_mont64>();
 }

client/src/bin/client_nbody.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_nbody);
+    program::<client::embench_sys::nbody>();
 }

client/src/bin/client_nettle-aes.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_nettle_aes);
+    program::<client::embench_sys::nettle_aes>();
 }

client/src/bin/client_nettle-sha256.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_nettle_sha256);
+    program::<client::embench_sys::nettle_sha256>();
 }

client/src/bin/client_nsichneu.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_nsichneu);
+    program::<client::embench_sys::nsichneu>();
 }

client/src/bin/client_picojpeg.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_picojpeg);
+    program::<client::embench_sys::picojpeg>();
 }

client/src/bin/client_primecount.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_primecount);
+    program::<client::embench_sys::primecount>();
 }

client/src/bin/client_slre.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_slre);
+    program::<client::embench_sys::slre>();
 }

client/src/bin/client_st.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_st);
+    program::<client::embench_sys::st>();
 }

client/src/bin/client_statemate.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_statemate);
+    program::<client::embench_sys::statemate>();
 }

client/src/bin/client_tarfind.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_tarfind);
+    program::<client::embench_sys::tarfind>();
 }

client/src/bin/client_ud.rs

@@ -1,5 +1,5 @@
-use client::{Benchmark, program};
+use client::program;
 
 fn main() {
-    program(Benchmark::benchmark_ud);
+    program::<client::embench_sys::ud>();
 }

client/src/lib.rs

@@ -1,6 +1,12 @@
 use std::arch::asm;
 
-mod embench_sys {
+pub mod embench_sys {
+    pub trait Benchmark {
+        unsafe fn init();
+
+        unsafe fn benchmark();
+    }
+
     include!(concat!(env!("OUT_DIR"), "/libembench-sys.rs"));
 }
 
@@ -12,14 +18,15 @@ fn ptwrite(val: u32) {
     }
 }
 
-pub fn program(benchmark: embench_sys::Benchmark) {
-    let start = std::time::Instant::now();
-    for _ in std::hint::black_box(0..100) {
-        ptwrite(42);
-        unsafe {
-            embench_sys::run(benchmark);
-        }
-        ptwrite(43);
+pub fn program<B: Benchmark>() {
+    unsafe {
+        B::init();
     }
+    let start = std::time::Instant::now();
+    ptwrite(42);
+    unsafe {
+        B::benchmark();
+    }
+    ptwrite(43);
     println!("{}", start.elapsed().as_secs_f64());
 }