externref: implement stack map-based garbage collection

Cargo.toml

@@ -38,6 +38,7 @@ pretty_env_logger = "0.4.0"
 file-per-thread-logger = "0.1.1"
 wat = "1.0.18"
 libc = "0.2.60"
+log = "0.4.8"
 rayon = "1.2.1"
 humantime = "1.3.0"
 
@@ -86,3 +87,6 @@ maintenance = { status = "actively-developed" }
 [[test]]
 name = "host_segfault"
 harness = false
+
+[profile.dev.package.backtrace]
+debug = false # FIXME(#1813)

build.rs

@@ -209,9 +209,14 @@ fn ignore(testsuite: &str, testname: &str, strategy: &str) -> bool {
             // testsuite repo.
             ("simd", "simd_const") => return true,
 
+            ("reference_types", "table_copy_on_imported_tables")
+            | ("reference_types", "externref_id_function") => {
+                // Ignore if this isn't x64, because Cranelift only supports
+                // reference types on x64.
+                return env::var("CARGO_CFG_TARGET_ARCH").unwrap() != "x86_64";
+            }
+
             // Still working on implementing these. See #929.
-            ("reference_types", "table_copy_on_imported_tables") => return false,
-            ("reference_types", "externref_id_function") => return false,
             ("reference_types", _) => return true,
 
             _ => {}

cranelift/codegen/src/binemit/stackmap.rs

@@ -103,7 +103,7 @@ impl Stackmap {
 
         // Refer to the doc comment for `Stackmap` above to understand the
         // bitmap representation used here.
-        let map_size = (dbg!(info.frame_size) + dbg!(info.inbound_args_size)) as usize;
+        let map_size = (info.frame_size + info.inbound_args_size) as usize;
         let word_size = isa.pointer_bytes() as usize;
         let num_words = map_size / word_size;
 

crates/environ/src/cache.rs

@@ -1,5 +1,5 @@
 use crate::address_map::{ModuleAddressMap, ValueLabelsRanges};
-use crate::compilation::{Compilation, Relocations, Traps};
+use crate::compilation::{Compilation, Relocations, StackMaps, Traps};
 use cranelift_codegen::ir;
 use cranelift_entity::PrimaryMap;
 use cranelift_wasm::DefinedFuncIndex;
@@ -35,6 +35,7 @@ pub struct ModuleCacheData {
     value_ranges: ValueLabelsRanges,
     stack_slots: PrimaryMap<DefinedFuncIndex, ir::StackSlots>,
     traps: Traps,
+    stack_maps: StackMaps,
 }
 
 /// A type alias over the module cache data as a tuple.
@@ -45,6 +46,7 @@ pub type ModuleCacheDataTupleType = (
     ValueLabelsRanges,
     PrimaryMap<DefinedFuncIndex, ir::StackSlots>,
     Traps,
+    StackMaps,
 );
 
 struct Sha256Hasher(Sha256);
@@ -204,6 +206,7 @@ impl ModuleCacheData {
             value_ranges: data.3,
             stack_slots: data.4,
             traps: data.5,
+            stack_maps: data.6,
         }
     }
 
@@ -215,6 +218,7 @@ impl ModuleCacheData {
             self.value_ranges,
             self.stack_slots,
             self.traps,
+            self.stack_maps,
         )
     }
 }

crates/environ/src/cache/tests.rs

@@ -100,5 +100,6 @@ fn new_module_cache_data() -> Result<ModuleCacheDataTupleType, ()> {
         PrimaryMap::new(),
         PrimaryMap::new(),
         PrimaryMap::new(),
+        PrimaryMap::new(),
     ))
 }