Add support for atomic wait and wake operators (#1140)

According to spec at https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#wait-and-wake-operators

1 files changed, 24 insertions, 0 deletions

diff --git a/src/wasm/wasm-s-parser.cpp b/src/wasm/wasm-s-parser.cpp
index 044507e86..fd7c7e7ae 100644
--- a/src/wasm/wasm-s-parser.cpp
+++ b/src/wasm/wasm-s-parser.cpp
@@ -781,6 +781,7 @@ Expression* SExpressionWasmBuilder::makeExpression(Element& s) {
         abort_on(op);
       }
       case 'w': {
+        if (!strncmp(op, "wait", strlen("wait"))) return makeAtomicWait(s, type);
         if (op[1] == 'r') return makeUnary(s,  UnaryOp::WrapInt64, type);
         abort_on(op);
       }
@@ -866,6 +867,9 @@ Expression* SExpressionWasmBuilder::makeExpression(Element& s) {
         if (str[1] == 'n') return allocator.alloc<Unreachable>();
         abort_on(str);
       }
+      case 'w': {
+        if (!strncmp(str, "wake", strlen("wake"))) return makeAtomicWake(s);
+      }
       default: abort_on(str);
     }
   }
@@ -1241,6 +1245,26 @@ Expression* SExpressionWasmBuilder::makeAtomicCmpxchg(Element& s, WasmType type,
   return ret;
 }
 
+Expression* SExpressionWasmBuilder::makeAtomicWait(Element& s, WasmType type) {
+  auto ret = allocator.alloc<AtomicWait>();
+  ret->type = i32;
+  ret->expectedType = type;
+  ret->ptr = parseExpression(s[1]);
+  ret->expected = parseExpression(s[2]);
+  ret->timeout = parseExpression(s[3]);
+  ret->finalize();
+  return ret;
+}
+
+Expression* SExpressionWasmBuilder::makeAtomicWake(Element& s) {
+  auto ret = allocator.alloc<AtomicWake>();
+  ret->type = i32;
+  ret->ptr = parseExpression(s[1]);
+  ret->wakeCount = parseExpression(s[2]);
+  ret->finalize();
+  return ret;
+}
+
 Expression* SExpressionWasmBuilder::makeIf(Element& s) {
   auto ret = allocator.alloc<If>();
   Index i = 1;