Get build info from mmtk-core (#174)

Author: qinsoon

mmtk/Cargo.lock

@@ -3,6 +3,7 @@ name = "mmtk_openjdk"
 version = "0.14.1"
 authors = [" <>"]
 rust-version = "1.57.0"
+build = "build.rs"
 
 [lib]
 name = "mmtk_openjdk"
@@ -16,7 +17,7 @@ lto = true
 [package.metadata.openjdk]
 # Our CI matches the following line and extract mmtk/openjdk. If this line is updated, please check ci yaml files and make sure it works.
 openjdk_repo = "https://github.com/mmtk/openjdk.git"
-openjdk_version = "b133bb2630121b6babc35750444f178b5d240ae0"
+openjdk_version = "ad1809129d6288e7f8226990840e5d32aab0ea34"
 
 [dependencies]
 libc = "0.2"
@@ -28,10 +29,13 @@ once_cell = "1.10.0"
 # - change branch
 # - change repo name
 # But other changes including adding/removing whitespaces in commented lines may break the CI.
-mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "a96e8f991c91a81df51e7975849441f52fdbcdcc" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "4904004d55c48858d12a97a8e2ebb559fb91c0de" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
+[build-dependencies]
+built = { version = "0.5.1", features = ["git2"] }
+
 [features]
 default = []
 mmtk_extreme_assertions = ["mmtk/extreme_assertions"]

mmtk/Cargo.toml

@@ -0,0 +1,3 @@
+fn main() {
+    built::write_built_file().expect("Failed to acquire build-time information");
+}

mmtk/build.rs

@@ -24,6 +24,11 @@ static NO_BARRIER: sync::Lazy<CString> = sync::Lazy::new(|| CString::new("NoBarr
 static OBJECT_BARRIER: sync::Lazy<CString> =
     sync::Lazy::new(|| CString::new("ObjectBarrier").unwrap());
 
+#[no_mangle]
+pub extern "C" fn get_mmtk_version() -> *const c_char {
+    crate::build_info::MMTK_OPENJDK_FULL_VERSION.as_ptr() as _
+}
+
 #[no_mangle]
 pub extern "C" fn mmtk_active_barrier() -> *const c_char {
     match SINGLETON.get_plan().constraints().barrier {

mmtk/src/api.rs

@@ -0,0 +1,18 @@
+mod raw {
+    // The include imports a full list of the constants in built.rs from https://docs.rs/built/latest/built/index.html
+    include!(concat!(env!("OUT_DIR"), "/built.rs"));
+}
+
+lazy_static! {
+    // Owned string for the binding version, such as MMTk OpenJDK 0.14.0 (cfc755f-dirty)
+    static ref BINDING_VERSION_STRING: String = match (raw::GIT_COMMIT_HASH, raw::GIT_DIRTY) {
+        (Some(hash), Some(dirty)) => format!("MMTk OpenJDK {} ({}{})", raw::PKG_VERSION, hash.split_at(7).0, if dirty { "-dirty" } else { "" }),
+        (Some(hash), None) => format!("MMTk OpenJDK {} ({}{})", raw::PKG_VERSION, hash.split_at(7).0, "-?"),
+        _ => format!("MMTk OpenJDK {}", raw::PKG_VERSION),
+    };
+    // Owned string for both binding and core version.
+    static ref MMTK_OPENJDK_FULL_VERSION_STRING: String = format!("{}, using {}", *BINDING_VERSION_STRING, *mmtk::build_info::MMTK_FULL_BUILD_INFO);
+
+    // Exposed &str for the full version.
+    pub static ref MMTK_OPENJDK_FULL_VERSION: &'static str = &MMTK_OPENJDK_FULL_VERSION_STRING;
+}

mmtk/src/build_info.rs

@@ -21,6 +21,7 @@ use mmtk::MMTK;
 mod abi;
 pub mod active_plan;
 pub mod api;
+mod build_info;
 pub mod collection;
 mod gc_work;
 pub mod object_model;