// Copyright 2007-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <signal.h>

#include "sys/stat.h"
#include "v8.h"

#include "debug.h"
#include "ic-inl.h"
#include "runtime.h"
#include "serialize.h"
#include "scopeinfo.h"
#include "snapshot.h"
#include "cctest.h"

using namespace v8::internal;

static const unsigned kCounters = 256;
static int local_counters[kCounters];
static const char* local_counter_names[kCounters];


static unsigned CounterHash(const char* s) {
  unsigned hash = 0;
  while (*++s) {
    hash |= hash << 5;
    hash += *s;
  }
  return hash;
}


// Callback receiver to track counters in test.
static int* counter_function(const char* name) {
  unsigned hash = CounterHash(name) % kCounters;
  unsigned original_hash = hash;
  USE(original_hash);
  while (true) {
    if (local_counter_names[hash] == name) {
      return &local_counters[hash];
    }
    if (local_counter_names[hash] == 0) {
      local_counter_names[hash] = name;
      return &local_counters[hash];
    }
    if (strcmp(local_counter_names[hash], name) == 0) {
      return &local_counters[hash];
    }
    hash = (hash + 1) % kCounters;
    ASSERT(hash != original_hash);  // Hash table has been filled up.
  }
}


template <class T>
static Address AddressOf(T id) {
  return ExternalReference(id).address();
}


template <class T>
static uint32_t Encode(const ExternalReferenceEncoder& encoder, T id) {
  return encoder.Encode(AddressOf(id));
}


static int make_code(TypeCode type, int id) {
  return static_cast<uint32_t>(type) << kReferenceTypeShift | id;
}


static int register_code(int reg) {
  return Debug::k_register_address << kDebugIdShift | reg;
}


TEST(ExternalReferenceEncoder) {
  StatsTable::SetCounterFunction(counter_function);
  Heap::Setup(false);
  ExternalReferenceEncoder encoder;
  CHECK_EQ(make_code(BUILTIN, Builtins::ArrayCode),
           Encode(encoder, Builtins::ArrayCode));
  CHECK_EQ(make_code(RUNTIME_FUNCTION, Runtime::kAbort),
           Encode(encoder, Runtime::kAbort));
  CHECK_EQ(make_code(IC_UTILITY, IC::kLoadCallbackProperty),
           Encode(encoder, IC_Utility(IC::kLoadCallbackProperty)));
  CHECK_EQ(make_code(DEBUG_ADDRESS, register_code(3)),
           Encode(encoder, Debug_Address(Debug::k_register_address, 3)));
  ExternalReference keyed_load_function_prototype =
      ExternalReference(&Counters::keyed_load_function_prototype);
  CHECK_EQ(make_code(STATS_COUNTER, Counters::k_keyed_load_function_prototype),
           encoder.Encode(keyed_load_function_prototype.address()));
  ExternalReference passed_function =
      ExternalReference::builtin_passed_function();
  CHECK_EQ(make_code(UNCLASSIFIED, 1),
           encoder.Encode(passed_function.address()));
  ExternalReference the_hole_value_location =
      ExternalReference::the_hole_value_location();
  CHECK_EQ(make_code(UNCLASSIFIED, 2),
           encoder.Encode(the_hole_value_location.address()));
  ExternalReference stack_guard_limit_address =
      ExternalReference::address_of_stack_guard_limit();
  CHECK_EQ(make_code(UNCLASSIFIED, 3),
           encoder.Encode(stack_guard_limit_address.address()));
  CHECK_EQ(make_code(UNCLASSIFIED, 5),
           encoder.Encode(ExternalReference::debug_break().address()));
  CHECK_EQ(make_code(UNCLASSIFIED, 6),
           encoder.Encode(ExternalReference::new_space_start().address()));
}


TEST(ExternalReferenceDecoder) {
  StatsTable::SetCounterFunction(counter_function);
  Heap::Setup(false);
  ExternalReferenceDecoder decoder;
  CHECK_EQ(AddressOf(Builtins::ArrayCode),
           decoder.Decode(make_code(BUILTIN, Builtins::ArrayCode)));
  CHECK_EQ(AddressOf(Runtime::kAbort),
           decoder.Decode(make_code(RUNTIME_FUNCTION, Runtime::kAbort)));
  CHECK_EQ(AddressOf(IC_Utility(IC::kLoadCallbackProperty)),
           decoder.Decode(make_code(IC_UTILITY, IC::kLoadCallbackProperty)));
  CHECK_EQ(AddressOf(Debug_Address(Debug::k_register_address, 3)),
           decoder.Decode(make_code(DEBUG_ADDRESS, register_code(3))));
  ExternalReference keyed_load_function =
      ExternalReference(&Counters::keyed_load_function_prototype);
  CHECK_EQ(keyed_load_function.address(),
           decoder.Decode(
               make_code(STATS_COUNTER,
                         Counters::k_keyed_load_function_prototype)));
  CHECK_EQ(ExternalReference::builtin_passed_function().address(),
           decoder.Decode(make_code(UNCLASSIFIED, 1)));
  CHECK_EQ(ExternalReference::the_hole_value_location().address(),
           decoder.Decode(make_code(UNCLASSIFIED, 2)));
  CHECK_EQ(ExternalReference::address_of_stack_guard_limit().address(),
           decoder.Decode(make_code(UNCLASSIFIED, 3)));
  CHECK_EQ(ExternalReference::debug_break().address(),
           decoder.Decode(make_code(UNCLASSIFIED, 5)));
  CHECK_EQ(ExternalReference::new_space_start().address(),
           decoder.Decode(make_code(UNCLASSIFIED, 6)));
}


static void Serialize() {
#ifdef DEBUG
  FLAG_debug_serialization = true;
#endif
  StatsTable::SetCounterFunction(counter_function);

  v8::HandleScope scope;
  const int kExtensionCount = 1;
  const char* extension_list[kExtensionCount] = { "v8/gc" };
  v8::ExtensionConfiguration extensions(kExtensionCount, extension_list);
  Serializer::Enable();
  v8::Persistent<v8::Context> env = v8::Context::New(&extensions);
  env->Enter();

  Snapshot::WriteToFile(FLAG_testing_serialization_file);
}


// Test that the whole heap can be serialized when running from the
// internal snapshot.
// (Smoke test.)
TEST(SerializeInternal) {
  Snapshot::Initialize(NULL);
  Serialize();
}


// Test that the whole heap can be serialized when running from a
// bootstrapped heap.
// (Smoke test.)
TEST(Serialize) {
  if (Snapshot::IsEnabled()) return;
  Serialize();
}


// Test that the heap isn't destroyed after a serialization.
TEST(SerializeNondestructive) {
  if (Snapshot::IsEnabled()) return;
  StatsTable::SetCounterFunction(counter_function);
  v8::HandleScope scope;
  Serializer::Enable();
  v8::Persistent<v8::Context> env = v8::Context::New();
  v8::Context::Scope context_scope(env);
  Serializer().Serialize();
  const char* c_source = "\"abcd\".charAt(2) == 'c'";
  v8::Local<v8::String> source = v8::String::New(c_source);
  v8::Local<v8::Script> script = v8::Script::Compile(source);
  v8::Local<v8::Value> value = script->Run();
  CHECK(value->BooleanValue());
}

//----------------------------------------------------------------------------
// Tests that the heap can be deserialized.

static void Deserialize() {
#ifdef DEBUG
  FLAG_debug_serialization = true;
#endif
  CHECK(Snapshot::Initialize(FLAG_testing_serialization_file));
}


static void SanityCheck() {
  v8::HandleScope scope;
#ifdef DEBUG
  Heap::Verify();
#endif
  CHECK(Top::global()->IsJSObject());
  CHECK(Top::global_context()->IsContext());
  CHECK(Top::special_function_table()->IsFixedArray());
  CHECK(Heap::symbol_table()->IsSymbolTable());
  CHECK(!Factory::LookupAsciiSymbol("Empty")->IsFailure());
}


DEPENDENT_TEST(Deserialize, Serialize) {
  v8::HandleScope scope;

  Deserialize();

  SanityCheck();
}

DEPENDENT_TEST(DeserializeAndRunScript, Serialize) {
  v8::HandleScope scope;

  Deserialize();

  const char* c_source = "\"1234\".length";
  v8::Local<v8::String> source = v8::String::New(c_source);
  v8::Local<v8::Script> script = v8::Script::Compile(source);
  CHECK_EQ(4, script->Run()->Int32Value());
}


DEPENDENT_TEST(DeserializeNatives, Serialize) {
  v8::HandleScope scope;

  Deserialize();

  const char* c_source = "\"abcd\".charAt(2) == 'c'";
  v8::Local<v8::String> source = v8::String::New(c_source);
  v8::Local<v8::Script> script = v8::Script::Compile(source);
  v8::Local<v8::Value> value = script->Run();
  CHECK(value->BooleanValue());
}


DEPENDENT_TEST(DeserializeExtensions, Serialize) {
  v8::HandleScope scope;

  Deserialize();
  const char* c_source = "gc();";
  v8::Local<v8::String> source = v8::String::New(c_source);
  v8::Local<v8::Script> script = v8::Script::Compile(source);
  v8::Local<v8::Value> value = script->Run();
  CHECK(value->IsUndefined());
}