1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/dataview/resizable-dataview-byteoffset.js b/js/src/jit-test/tests/dataview/resizable-dataview-byteoffset.js
new file mode 100644
index 0000000000..3f0afa1169
--- /dev/null
+++ b/js/src/jit-test/tests/dataview/resizable-dataview-byteoffset.js
@@ -0,0 +1,67 @@
+// |jit-test| --enable-arraybuffer-resizable; skip-if: !ArrayBuffer.prototype.resize
+
+load(libdir + "asserts.js");
+
+function testResizableArrayBufferAutoLength() {
+  for (let i = 0; i < 4; ++i) {
+    let ab = new ArrayBuffer(i, {maxByteLength: i + 1});
+    let ta = new DataView(ab);
+    for (let j = 0; j < 100; ++j) {
+      ab.resize(i);
+      assertEq(ta.byteOffset, 0);
+
+      ab.resize(i + 1);
+      assertEq(ta.byteOffset, 0);
+
+      if (i > 0) {
+        ab.resize(i - 1);
+        assertEq(ta.byteOffset, 0);
+      }
+    }
+  }
+}
+for (let i = 0; i < 2; ++i) testResizableArrayBufferAutoLength();
+
+function testResizableArrayBufferAutoLengthNonZeroOffset() {
+  for (let i = 1; i < 4 + 1; ++i) {
+    let ab = new ArrayBuffer(i, {maxByteLength: i + 1});
+    let ta = new DataView(ab, 1);
+    for (let j = 0; j < 100; ++j) {
+      ab.resize(i);
+      assertEq(ta.byteOffset, 1);
+
+      ab.resize(i + 1);
+      assertEq(ta.byteOffset, 1);
+
+      ab.resize(i - 1);
+      if (i > 1) {
+        assertEq(ta.byteOffset, 1);
+      } else {
+        assertThrowsInstanceOf(() => ta.byteOffset, TypeError);
+      }
+    }
+  }
+}
+for (let i = 0; i < 2; ++i) testResizableArrayBufferAutoLengthNonZeroOffset();
+
+function testResizableArrayBufferNonZeroOffset() {
+  for (let i = 2; i < 4 + 2; ++i) {
+    let ab = new ArrayBuffer(i, {maxByteLength: i + 1});
+    let ta = new DataView(ab, 1, 1);
+    for (let j = 0; j < 100; ++j) {
+      ab.resize(i);
+      assertEq(ta.byteOffset, 1);
+
+      ab.resize(i + 1);
+      assertEq(ta.byteOffset, 1);
+
+      ab.resize(i - 1);
+      if (i > 2) {
+        assertEq(ta.byteOffset, 1);
+      } else {
+        assertThrowsInstanceOf(() => ta.byteOffset, TypeError);
+      }
+    }
+  }
+}
+for (let i = 0; i < 2; ++i) testResizableArrayBufferNonZeroOffset();