Fixes #118: Add support for atomic.fence;

Author: bnjbvr

src/binary_reader.rs

@@ -608,6 +608,9 @@ impl<'a> BinaryReader<'a> {
             0x02 => Operator::I64Wait {
                 memarg: self.read_memarg_of_align(3)?,
             },
+            0x03 => Operator::Fence {
+                flags: self.read_u8()? as u8,
+            },
             0x10 => Operator::I32AtomicLoad {
                 memarg: self.read_memarg_of_align(2)?,
             },

src/operators_validator.rs

@@ -1225,6 +1225,12 @@ impl OperatorValidator {
                 self.check_operands(&[Type::I32, Type::I64, Type::I64])?;
                 self.func_state.change_frame_with_type(3, Type::I32)?;
             }
+            Operator::Fence { ref flags } => {
+                self.check_threads_enabled()?;
+                if *flags != 0 {
+                    return Err("non-zero flags for fence not supported yet");
+                }
+            }
             Operator::RefNull => {
                 self.check_reference_types_enabled()?;
                 self.func_state.change_frame_with_type(0, Type::AnyRef)?;

src/primitives.rs

@@ -444,6 +444,7 @@ pub enum Operator<'a> {
     Wake { memarg: MemoryImmediate },
     I32Wait { memarg: MemoryImmediate },
     I64Wait { memarg: MemoryImmediate },
+    Fence { flags: u8 },
     I32AtomicLoad { memarg: MemoryImmediate },
     I64AtomicLoad { memarg: MemoryImmediate },
     I32AtomicLoad8U { memarg: MemoryImmediate },