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#include <stdlib.h>

#include "cctest.h"
#include "platform.h"

using namespace ::v8::internal;

#ifdef __GNUC__
#define ASM __asm__ __volatile__

#if defined(_M_X64) || defined(__x86_64__)
#define GET_STACK_POINTER() \
  static int sp_addr = 0; \
  do { \
    ASM("mov %%rsp, %0" : "=g" (sp_addr)); \
  } while (0)
#elif defined(_M_IX86) || defined(__i386__)
#define GET_STACK_POINTER() \
  static int sp_addr = 0; \
  do { \
    ASM("mov %%esp, %0" : "=g" (sp_addr)); \
  } while (0)
#elif defined(__ARMEL__)
#define GET_STACK_POINTER() \
  static int sp_addr = 0; \
  do { \
    ASM("str %%sp, %0" : "=g" (sp_addr)); \
  } while (0)
#elif defined(__MIPSEL__)
#define GET_STACK_POINTER() \
  static int sp_addr = 0; \
  do { \
    ASM("sw $sp, %0" : "=g" (sp_addr)); \
  } while (0)
#else
#error Host architecture was not detected as supported by v8
#endif

void GetStackPointer(const v8::FunctionCallbackInfo<v8::Value>& args) {
  GET_STACK_POINTER();
  args.GetReturnValue().Set(v8_num(sp_addr));
}


TEST(StackAlignment) {
  v8::Isolate* isolate = CcTest::isolate();
  v8::HandleScope handle_scope(isolate);
  v8::Handle<v8::ObjectTemplate> global_template =
      v8::ObjectTemplate::New(isolate);
  global_template->Set(v8_str("get_stack_pointer"),
                       v8::FunctionTemplate::New(isolate, GetStackPointer));

  LocalContext env(NULL, global_template);
  CompileRun(
      "function foo() {"
      "  return get_stack_pointer();"
      "}");

  v8::Local<v8::Object> global_object = env->Global();
  v8::Local<v8::Function> foo =
      v8::Local<v8::Function>::Cast(global_object->Get(v8_str("foo")));

  v8::Local<v8::Value> result = foo->Call(global_object, 0, NULL);
  CHECK_EQ(0, result->Int32Value() % OS::ActivationFrameAlignment());
}

#undef GET_STACK_POINTERS
#undef ASM
#endif  // __GNUC__
