Support SAB atomics for offset-TypedArray

test/mjsunit/asm/atomics-exchange.js

Index: test/mjsunit/asm/atomics-exchange.js
diff --git a/test/mjsunit/asm/atomics-exchange.js b/test/mjsunit/asm/atomics-exchange.js
index ed2b0fa21b4679f7ec29bea9ac832333ec4d9cb9..6de7b4b954021f61669f7a99751710d5091b7c04 100644
--- a/test/mjsunit/asm/atomics-exchange.js
+++ b/test/mjsunit/asm/atomics-exchange.js
@@ -4,14 +4,14 @@
 
 // Flags: --harmony-sharedarraybuffer
 
-function Module(stdlib, foreign, heap) {
+function Module(stdlib, foreign, heap, offset) {
   "use asm";
-  var MEM8 = new stdlib.Int8Array(heap);
-  var MEM16 = new stdlib.Int16Array(heap);
-  var MEM32 = new stdlib.Int32Array(heap);
-  var MEMU8 = new stdlib.Uint8Array(heap);
-  var MEMU16 = new stdlib.Uint16Array(heap);
-  var MEMU32 = new stdlib.Uint32Array(heap);
+  var MEM8 = new stdlib.Int8Array(heap, offset);
+  var MEM16 = new stdlib.Int16Array(heap, offset);
+  var MEM32 = new stdlib.Int32Array(heap, offset);
+  var MEMU8 = new stdlib.Uint8Array(heap, offset);
+  var MEMU16 = new stdlib.Uint16Array(heap, offset);
+  var MEMU32 = new stdlib.Uint32Array(heap, offset);
   var exchange = stdlib.Atomics.exchange;
   var fround = stdlib.Math.fround;
 
@@ -71,10 +71,10 @@ function clearArray() {
   }
 }
 
-function testElementType(taConstr, f) {
+function testElementType(taConstr, f, offset) {
   clearArray();
 
-  var ta = new taConstr(sab);
+  var ta = new taConstr(sab, offset);
   var name = Object.prototype.toString.call(ta);
   ta[0] = 0x7f;
   assertEquals(0x7f, f(0, 0xf), name);
@@ -84,9 +84,21 @@ function testElementType(taConstr, f) {
   assertEquals(0, f(ta.length, 0), name);
 }
 
-testElementType(Int8Array, m.exchangei8);
-testElementType(Int16Array, m.exchangei16);
-testElementType(Int32Array, m.exchangei32);
-testElementType(Uint8Array, m.exchangeu8);
-testElementType(Uint16Array, m.exchangeu16);
-testElementType(Uint32Array, m.exchangeu32);
+function testElement(m, offset) {
+  testElementType(Int8Array, m.exchangei8, offset);
+  testElementType(Int16Array, m.exchangei16, offset);
+  testElementType(Int32Array, m.exchangei32, offset);
+  testElementType(Uint8Array, m.exchangeu8, offset);
+  testElementType(Uint16Array, m.exchangeu16, offset);
+  testElementType(Uint32Array, m.exchangeu32, offset);
+}
+
+var offset = 0;
+var sab = new SharedArrayBuffer(16);
+var m1 = Module(this, {}, sab, offset);
+testElement(m1, offset);
+
+offset = 32;
+sab = new SharedArrayBuffer(64);
+var m2 = Module(this, {}, sab, offset);
+testElement(m2, offset);