text: // Copyright 2013 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 <stdlib.h>
  
  #include "cctest.h"
  #include "platform.h"
  
  using namespace ::v8::internal;
  
  TEST(NumberOfCores) {
    CHECK_GT(OS::NumberOfCores(), 0);
  }
  
  
  #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 = v8::Isolate::GetCurrent();
    v8::HandleScope handle_scope(isolate);
    v8::Handle<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
    global_template->Set(v8_str("get_stack_pointer"),
                         v8::FunctionTemplate::New(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__
  