testArrayBufferWithUserOwnedContents.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

*/

#include <stdint.h>  // uint32_t

#include "js/ArrayBuffer.h"  // JS::{DetachArrayBuffer,GetArrayBuffer{ByteLength,Data},IsArrayBufferObject,NewArrayBufferWithUserOwnedContents}

#include "js/GCAPI.h"        // JS::AutoCheckCannotGC, JS_GC

#include "js/RootingAPI.h"   // JS::Rooted

#include "jsapi-tests/tests.h"

#include "vm/ArrayBufferObject.h"

char testData[] =

    "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

constexpr size_t testDataLength = sizeof(testData);

static void GC(JSContext* cx) {

  JS_GC(cx);

  // Trigger another to wait for background finalization to end.

  JS_GC(cx);

BEGIN_TEST(testArrayBufferWithUserOwnedContents) {

  JS::Rooted<JSObject*> obj(cx, JS::NewArrayBufferWithUserOwnedContents(

                                    cx, testDataLength, testData));

  GC(cx);

  CHECK(VerifyObject(obj, testDataLength));

  GC(cx);

  JS::DetachArrayBuffer(cx, obj);

  GC(cx);

  CHECK(VerifyObject(obj, 0));

  return true;

bool VerifyObject(JS::HandleObject obj, uint32_t length) {

  JS::AutoCheckCannotGC nogc;

  CHECK(obj);

  CHECK(JS::IsArrayBufferObject(obj));

  CHECK_EQUAL(JS::GetArrayBufferByteLength(obj), length);

  bool sharedDummy;

  const char* data = reinterpret_cast<const char*>(

      JS::GetArrayBufferData(obj, &sharedDummy, nogc));

  if (length == testDataLength) {

    CHECK(data);

    CHECK(testData == data);

  return true;

END_TEST(testArrayBufferWithUserOwnedContents)