Update to mmtk-core PR #838 (#221)

This PR updates mmtk-core to mmtk/mmtk-core#838.

Author: qinsoon

mmtk/Cargo.lock

@@ -30,7 +30,7 @@ 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 = "de8bbfe623eee5e915f32870de8f81128df8ad41" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "2ec37bde7955304f3e4bc5f7bed3fbfba3833cc0" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 

mmtk/Cargo.toml

@@ -129,7 +129,7 @@ pub extern "C" fn alloc(
     mutator: *mut Mutator<OpenJDK>,
     size: usize,
     align: usize,
-    offset: isize,
+    offset: usize,
     allocator: AllocationSemantics,
 ) -> Address {
     memory_manager::alloc::<OpenJDK>(unsafe { &mut *mutator }, size, align, offset, allocator)

mmtk/src/api.rs

@@ -72,7 +72,7 @@ impl ObjectModel<OpenJDK> for VMObjectModel {
         ::std::mem::size_of::<usize>()
     }
 
-    fn get_align_offset_when_copied(_object: ObjectReference) -> isize {
+    fn get_align_offset_when_copied(_object: ObjectReference) -> usize {
         0
     }
 

mmtk/src/object_model.rs

@@ -44,7 +44,7 @@ extern void* alloc_slow_largeobject(MMTk_Mutator mutator, size_t size,
     size_t align, size_t offset);
 
 extern void post_alloc(MMTk_Mutator mutator, void* refer,
-    int bytes, int allocator);
+    size_t bytes, int allocator);
 
 /// Full pre-barrier
 extern void mmtk_object_reference_write_pre(MMTk_Mutator mutator, void* src, void* slot, void* target);