Check and pass the ACLE licence on to generated tests.

The generated tests are transient, and aren't committed, so this is
primarily a safety check.

library/stdarch/crates/intrinsic-test/LICENSE-MIT

@@ -1,4 +1,4 @@
-Copyright (c) 2021-2022 The Rust Project Developers
+Copyright (c) 2021-2023 The Rust Project Developers
 
 Permission is hereby granted, free of charge, to any
 person obtaining a copy of this software and associated

library/stdarch/crates/intrinsic-test/src/acle_csv_parser.rs

@@ -6,9 +6,53 @@ use crate::argument::{Argument, ArgumentList, Constraint};
 use crate::intrinsic::Intrinsic;
 use crate::types::{IntrinsicType, TypeKind};
 
-pub fn get_acle_intrinsics(filename: &str) -> Vec<Intrinsic> {
+pub struct CsvMetadata {
+    notices: String,
+    spdx_lic: String,
+}
+
+impl CsvMetadata {
+    fn new<'a>(header: impl Iterator<Item = &'a str>) -> Self {
+        lazy_static! {
+            static ref SPDX_LICENSE_IDENTIFIER: Regex =
+                Regex::new(r#"SPDX-License-Identifier:(.*)"#).unwrap();
+        }
+
+        let notices = header.map(|line| format!("{line}\n")).collect::<String>();
+        let spdx_lic = match SPDX_LICENSE_IDENTIFIER
+            .captures_iter(&notices)
+            .exactly_one()
+        {
+            Ok(caps) => {
+                let cap = caps.get(1).unwrap().as_str().trim();
+                // Ensure that (unlikely) ACLE licence changes don't go unnoticed.
+                assert_eq!(cap, "Apache-2.0");
+                cap.to_string()
+            }
+            Err(caps_iter) => panic!(
+                "Expected exactly one SPDX-License-Identifier, found {}.",
+                caps_iter.count()
+            ),
+        };
+
+        Self { notices, spdx_lic }
+    }
+
+    pub fn spdx_license_identifier(&self) -> &str {
+        self.spdx_lic.as_str()
+    }
+
+    pub fn notices_lines(&self) -> impl Iterator<Item = &str> {
+        self.notices.lines()
+    }
+}
+
+pub fn get_acle_intrinsics(filename: &str) -> (CsvMetadata, Vec<Intrinsic>) {
     let data = std::fs::read_to_string(filename).expect("Failed to open ACLE intrinsics file");
 
+    let comment_header = data.lines().map_while(|l| l.strip_prefix("<COMMENT>\t"));
+    let meta = CsvMetadata::new(comment_header);
+
     let data = data
         .lines()
         .filter_map(|l| {
@@ -51,7 +95,7 @@ pub fn get_acle_intrinsics(filename: &str) -> Vec<Intrinsic> {
         }
     }
 
-    intrinsics.to_vec()
+    (meta, intrinsics.to_vec())
 }
 
 impl Into<Intrinsic> for ACLEIntrinsicLine {

library/stdarch/crates/intrinsic-test/src/main.rs

@@ -14,7 +14,7 @@ use itertools::Itertools;
 use rayon::prelude::*;
 use types::TypeKind;
 
-use crate::acle_csv_parser::get_acle_intrinsics;
+use crate::acle_csv_parser::{get_acle_intrinsics, CsvMetadata};
 use crate::argument::Argument;
 
 mod acle_csv_parser;
@@ -70,6 +70,7 @@ fn gen_code_c(
 }
 
 fn generate_c_program(
+    notices: &str,
     header_files: &[&str],
     intrinsic: &Intrinsic,
     p64_armv7_workaround: bool,
@@ -81,7 +82,7 @@ fn generate_c_program(
         .collect_vec();
 
     format!(
-        r#"{header_files}
+        r#"{notices}{header_files}
 #include <iostream>
 #include <cstring>
 #include <iomanip>
@@ -157,7 +158,7 @@ fn gen_code_rust(intrinsic: &Intrinsic, constraints: &[&Argument], name: String)
     }
 }
 
-fn generate_rust_program(intrinsic: &Intrinsic, a32: bool) -> String {
+fn generate_rust_program(notices: &str, intrinsic: &Intrinsic, a32: bool) -> String {
     let constraints = intrinsic
         .arguments
         .iter()
@@ -165,7 +166,7 @@ fn generate_rust_program(intrinsic: &Intrinsic, a32: bool) -> String {
         .collect_vec();
 
     format!(
-        r#"#![feature(simd_ffi)]
+        r#"{notices}#![feature(simd_ffi)]
 #![feature(link_llvm_intrinsics)]
 #![feature(stdsimd)]
 #![allow(overflowing_literals)]
@@ -217,7 +218,23 @@ fn compile_c(c_filename: &str, intrinsic: &Intrinsic, compiler: &str, a32: bool)
     }
 }
 
-fn build_c(intrinsics: &Vec<Intrinsic>, compiler: &str, a32: bool) -> bool {
+fn build_notices(csv_metadata: &CsvMetadata, line_prefix: &str) -> String {
+    let mut notices = format!(
+        "\
+{line_prefix}This is a transient test file, not intended for distribution. Some aspects of the
+{line_prefix}test are derived from a CSV specification, published with the following notices:
+{line_prefix}
+"
+    );
+    let lines = csv_metadata
+        .notices_lines()
+        .map(|line| format!("{line_prefix}    {line}\n"));
+    notices.extend(lines);
+    notices.push_str("\n");
+    notices
+}
+
+fn build_c(notices: &str, intrinsics: &Vec<Intrinsic>, compiler: &str, a32: bool) -> bool {
     let _ = std::fs::create_dir("c_programs");
     intrinsics
         .par_iter()
@@ -225,7 +242,7 @@ fn build_c(intrinsics: &Vec<Intrinsic>, compiler: &str, a32: bool) -> bool {
             let c_filename = format!(r#"c_programs/{}.cpp"#, i.name);
             let mut file = File::create(&c_filename).unwrap();
 
-            let c_code = generate_c_program(&["arm_neon.h", "arm_acle.h"], &i, a32);
+            let c_code = generate_c_program(notices, &["arm_neon.h", "arm_acle.h"], &i, a32);
             file.write_all(c_code.into_bytes().as_slice()).unwrap();
             compile_c(&c_filename, &i, compiler, a32)
         })
@@ -233,14 +250,20 @@ fn build_c(intrinsics: &Vec<Intrinsic>, compiler: &str, a32: bool) -> bool {
         .is_none()
 }
 
-fn build_rust(intrinsics: &Vec<Intrinsic>, toolchain: &str, a32: bool) -> bool {
+fn build_rust(
+    notices: &str,
+    spdx_lic: &str,
+    intrinsics: &Vec<Intrinsic>,
+    toolchain: &str,
+    a32: bool,
+) -> bool {
     intrinsics.iter().for_each(|i| {
         let rust_dir = format!(r#"rust_programs/{}"#, i.name);
         let _ = std::fs::create_dir_all(&rust_dir);
         let rust_filename = format!(r#"{rust_dir}/main.rs"#);
         let mut file = File::create(&rust_filename).unwrap();
 
-        let c_code = generate_rust_program(&i, a32);
+        let c_code = generate_rust_program(notices, &i, a32);
         file.write_all(c_code.into_bytes().as_slice()).unwrap();
     });
 
@@ -249,9 +272,10 @@ fn build_rust(intrinsics: &Vec<Intrinsic>, toolchain: &str, a32: bool) -> bool {
         .write_all(
             format!(
                 r#"[package]
-name = "intrinsic-test"
+name = "intrinsic-test-programs"
 version = "{version}"
 authors = ["{authors}"]
+license = "{spdx_lic}"
 edition = "2018"
 [workspace]
 [dependencies]
@@ -371,7 +395,7 @@ fn main() {
     };
     let a32 = matches.is_present("A32");
 
-    let intrinsics = get_acle_intrinsics(filename);
+    let (csv_metadata, intrinsics) = get_acle_intrinsics(filename);
 
     let mut intrinsics = intrinsics
         .into_iter()
@@ -394,11 +418,14 @@ fn main() {
         .collect::<Vec<_>>();
     intrinsics.dedup();
 
-    if !build_c(&intrinsics, cpp_compiler, a32) {
+    let notices = build_notices(&csv_metadata, "// ");
+    let spdx_lic = csv_metadata.spdx_license_identifier();
+
+    if !build_c(&notices, &intrinsics, cpp_compiler, a32) {
         std::process::exit(2);
     }
 
-    if !build_rust(&intrinsics, &toolchain, a32) {
+    if !build_rust(&notices, spdx_lic, &intrinsics, &toolchain, a32) {
         std::process::exit(3);
     }