test-alloc.cc

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// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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#include "v8.h"
#include "accessors.h"

#include "cctest.h"


using namespace v8::internal;


// Also used in test-heap.cc test cases.
void SimulateFullSpace(PagedSpace* space) {
  int old_linear_size = static_cast<int>(space->limit() - space->top());
  space->Free(space->top(), old_linear_size);
  space->SetTop(space->limit(), space->limit());
  space->ResetFreeList();
  space->ClearStats();
}


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

  // New space.
  NewSpace* new_space = heap->new_space();
  static const int kNewSpaceFillerSize = ByteArray::SizeFor(0);
  while (new_space->Available() > kNewSpaceFillerSize) {
    int available_before = static_cast<int>(new_space->Available());
    CHECK(!heap->AllocateByteArray(0)->IsFailure());
    if (available_before == new_space->Available()) {
      // It seems that we are avoiding new space allocations when
      // allocation is forced, so no need to fill up new space
      // in order to make the test harder.
      break;
    }
  }
  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(
      *Isolate::Current()->object_function())->ToObjectChecked();
  CHECK(!heap->CopyJSObject(JSObject::cast(object))->IsFailure());

  // Old data space.
  SimulateFullSpace(heap->old_data_space());
  CHECK(!heap->AllocateRawAsciiString(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.
  CHECK(!heap->AllocateFixedArray(100, TENURED)->IsFailure());
  CHECK(!heap->CopyCode(Isolate::Current()->builtins()->builtin(
      Builtins::kIllegal))->IsFailure());

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


static Handle<Object> Test() {
  CALL_HEAP_FUNCTION(ISOLATE, AllocateAfterFailures(), Object);
}


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


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


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


TEST(StressJS) {
  v8::Persistent<v8::Context> env = v8::Context::New();
  v8::HandleScope scope;
  env->Enter();
  Handle<JSFunction> function =
      FACTORY->NewFunction(FACTORY->function_symbol(), FACTORY->null_value());
  // Force the creation of an initial map and set the code to
  // something empty.
  FACTORY->NewJSObject(function);
  function->ReplaceCode(Isolate::Current()->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),
                        v8::internal::PropertyDetails::kInitialIndex);
  map->AppendDescriptor(&d, witness);

  // Add the Foo constructor the global object.
  env->Global()->Set(v8::String::New("Foo"), v8::Utils::ToLocal(function));
  // Call the accessor through JavaScript.
  v8::Handle<v8::Value> result =
      v8::Script::Compile(v8::String::New("(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;
  OS::SetUp();
  Isolate::Current()->InitializeLoggingAndCounters();
  CodeRange* code_range = new CodeRange(Isolate::Current());
  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::kMaxNonCodeHeapObjectSize (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::kMaxNonCodeHeapObjectSize << (Pseudorandom() % 3)) +
          Pseudorandom() % 5000 + 1;
      size_t allocated = 0;
      Address base = code_range->AllocateRawMemory(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();
  delete code_range;
}