CSE2410 Fall 2014 Bounce

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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();

  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__