test-alloc.cc

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// Copyright 2012 the V8 project authors. All rights reserved.
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#include "v8.h"
#include "accessors.h"

#include "cctest.h"


using namespace v8::internal;


static MaybeObject* AllocateAfterFailures() {
  static int attempts = 0;
  if (++attempts < 3) return Failure::RetryAfterGC();
  Heap* heap = CcTest::heap();

  // New space.
  SimulateFullSpace(heap->new_space());
  CHECK(!heap->AllocateByteArray(100)->IsFailure());
  CHECK(!heap->AllocateFixedArray(100, NOT_TENURED)->IsFailure());

  // Make sure we can allocate through optimized allocation functions
  // for specific kinds.
  CHECK(!heap->AllocateFixedArray(100)->IsFailure());
  CHECK(!heap->AllocateHeapNumber(0.42)->IsFailure());
  CHECK(!heap->AllocateArgumentsObject(Smi::FromInt(87), 10)->IsFailure());
  Object* object = heap->AllocateJSObject(
      *CcTest::i_isolate()->object_function())->ToObjectChecked();
  CHECK(!heap->CopyJSObject(JSObject::cast(object))->IsFailure());

  // Old data space.
  SimulateFullSpace(heap->old_data_space());
  CHECK(!heap->AllocateRawOneByteString(100, TENURED)->IsFailure());

  // Old pointer space.
  SimulateFullSpace(heap->old_pointer_space());
  CHECK(!heap->AllocateFixedArray(10000, TENURED)->IsFailure());

  // Large object space.
  static const int kLargeObjectSpaceFillerLength = 300000;
  static const int kLargeObjectSpaceFillerSize = FixedArray::SizeFor(
      kLargeObjectSpaceFillerLength);
  ASSERT(kLargeObjectSpaceFillerSize > heap->old_pointer_space()->AreaSize());
  while (heap->OldGenerationSpaceAvailable() > kLargeObjectSpaceFillerSize) {
    CHECK(!heap->AllocateFixedArray(kLargeObjectSpaceFillerLength, TENURED)->
          IsFailure());
  }
  CHECK(!heap->AllocateFixedArray(kLargeObjectSpaceFillerLength, TENURED)->
        IsFailure());

  // Map space.
  SimulateFullSpace(heap->map_space());
  int instance_size = JSObject::kHeaderSize;
  CHECK(!heap->AllocateMap(JS_OBJECT_TYPE, instance_size)->IsFailure());

  // Test that we can allocate in old pointer space and code space.
  SimulateFullSpace(heap->code_space());
  CHECK(!heap->AllocateFixedArray(100, TENURED)->IsFailure());
  CHECK(!heap->CopyCode(CcTest::i_isolate()->builtins()->builtin(
      Builtins::kIllegal))->IsFailure());

  // Return success.
  return Smi::FromInt(42);
}


static Handle<Object> Test() {
  CALL_HEAP_FUNCTION(CcTest::i_isolate(), AllocateAfterFailures(), Object);
}


TEST(StressHandles) {
  v8::HandleScope scope(CcTest::isolate());
  v8::Handle<v8::Context> env = v8::Context::New(CcTest::isolate());
  env->Enter();
  Handle<Object> o = Test();
  CHECK(o->IsSmi() && Smi::cast(*o)->value() == 42);
  env->Exit();
}


static MaybeObject* TestAccessorGet(Isolate* isolate, Object* object, void*) {
  return AllocateAfterFailures();
}


const AccessorDescriptor kDescriptor = {
  TestAccessorGet,
  0,
  0
};


TEST(StressJS) {
  Isolate* isolate = CcTest::i_isolate();
  Factory* factory = isolate->factory();
  v8::HandleScope scope(CcTest::isolate());
  v8::Handle<v8::Context> env = v8::Context::New(CcTest::isolate());
  env->Enter();
  Handle<JSFunction> function =
      factory->NewFunction(factory->function_string(), factory->null_value());
  // Force the creation of an initial map and set the code to
  // something empty.
  factory->NewJSObject(function);
  function->ReplaceCode(CcTest::i_isolate()->builtins()->builtin(
      Builtins::kEmptyFunction));
  // Patch the map to have an accessor for "get".
  Handle<Map> map(function->initial_map());
  Handle<DescriptorArray> instance_descriptors(map->instance_descriptors());
  Handle<Foreign> foreign = factory->NewForeign(&kDescriptor);
  Handle<String> name =
      factory->NewStringFromAscii(Vector<const char>("get", 3));
  ASSERT(instance_descriptors->IsEmpty());

  Handle<DescriptorArray> new_descriptors = factory->NewDescriptorArray(0, 1);

  v8::internal::DescriptorArray::WhitenessWitness witness(*new_descriptors);
  map->set_instance_descriptors(*new_descriptors);

  CallbacksDescriptor d(*name,
                        *foreign,
                        static_cast<PropertyAttributes>(0));
  map->AppendDescriptor(&d, witness);

  // Add the Foo constructor the global object.
  env->Global()->Set(v8::String::NewFromUtf8(CcTest::isolate(), "Foo"),
                     v8::Utils::ToLocal(function));
  // Call the accessor through JavaScript.
  v8::Handle<v8::Value> result = v8::Script::Compile(
      v8::String::NewFromUtf8(CcTest::isolate(), "(new Foo).get"))->Run();
  CHECK_EQ(42, result->Int32Value());
  env->Exit();
}


// CodeRange test.
// Tests memory management in a CodeRange by allocating and freeing blocks,
// using a pseudorandom generator to choose block sizes geometrically
// distributed between 2 * Page::kPageSize and 2^5 + 1 * Page::kPageSize.
// Ensure that the freed chunks are collected and reused by allocating (in
// total) more than the size of the CodeRange.

// This pseudorandom generator does not need to be particularly good.
// Use the lower half of the V8::Random() generator.
unsigned int Pseudorandom() {
  static uint32_t lo = 2345;
  lo = 18273 * (lo & 0xFFFF) + (lo >> 16);  // Provably not 0.
  return lo & 0xFFFF;
}


// Plain old data class.  Represents a block of allocated memory.
class Block {
 public:
  Block(Address base_arg, int size_arg)
      : base(base_arg), size(size_arg) {}

  Address base;
  int size;
};


TEST(CodeRange) {
  const int code_range_size = 32*MB;
  CcTest::InitializeVM();
  CodeRange code_range(reinterpret_cast<Isolate*>(CcTest::isolate()));
  code_range.SetUp(code_range_size);
  int current_allocated = 0;
  int total_allocated = 0;
  List<Block> blocks(1000);

  while (total_allocated < 5 * code_range_size) {
    if (current_allocated < code_range_size / 10) {
      // Allocate a block.
      // Geometrically distributed sizes, greater than
      // Page::kMaxRegularHeapObjectSize (which is greater than code page area).
      // TODO(gc): instead of using 3 use some contant based on code_range_size
      // kMaxHeapObjectSize.
      size_t requested =
          (Page::kMaxRegularHeapObjectSize << (Pseudorandom() % 3)) +
          Pseudorandom() % 5000 + 1;
      size_t allocated = 0;
      Address base = code_range.AllocateRawMemory(requested,
                                                  requested,
                                                  &allocated);
      CHECK(base != NULL);
      blocks.Add(Block(base, static_cast<int>(allocated)));
      current_allocated += static_cast<int>(allocated);
      total_allocated += static_cast<int>(allocated);
    } else {
      // Free a block.
      int index = Pseudorandom() % blocks.length();
      code_range.FreeRawMemory(blocks[index].base, blocks[index].size);
      current_allocated -= blocks[index].size;
      if (index < blocks.length() - 1) {
        blocks[index] = blocks.RemoveLast();
      } else {
        blocks.RemoveLast();
      }
    }
  }

  code_range.TearDown();
}