C++ StackValueCollection::add方法代码示例

StackValueCollection*  interpretedVFrame::expressions() const {
  int length = fr().interpreter_frame_expression_stack_size();
  if (method()->is_native()) {
    // If the method is native, there is no expression stack
    length = 0;
  }

  int nof_locals = method()->max_locals();
  StackValueCollection* result = new StackValueCollection(length);

  // Get oopmap describing oops and int for current bci
  InterpreterOopMap oop_mask;
  method()->mask_for(bci(), &oop_mask);
  
  // handle locals
  for(int i=0; i < length; i++) {
    // Find stack location
    intptr_t *addr = expression_stack_addr_at(i);           

    // Depending on oop/int put it in the right package
    StackValue *sv;    
    if (oop_mask.is_oop(i + nof_locals)) {
      // oop value
      Handle h(*(oop *)addr);
      sv = new StackValue(h);
    } else {
      // integer
      sv = new StackValue(*addr);
    }    
    assert(sv != NULL, "sanity check");
    result->add(sv);
  }

  return result;
}

StackValueCollection* compiledVFrame::expressions() const {
  // Natives has no scope
  if (scope() == NULL) return new StackValueCollection(0);
  GrowableArray<ScopeValue*>*  scv_list = scope()->expressions();
  if (scv_list == NULL) return new StackValueCollection(0);

  // scv_list is the list of ScopeValues describing the JVM stack state.
  // There is one scv_list entry for every JVM stack state in use.
  int length = scv_list->length();
  StackValueCollection* result = new StackValueCollection(length);
  for( int i = 0; i < length; i++ )
    result->add( create_stack_value(scv_list->at(i)) );

  return result;
}

StackValueCollection* interpretedVFrame::locals() const {
  int length = method()->max_locals();
 
  if (method()->is_native()) {
    // If the method is native, max_locals is not telling the truth.
    // maxlocals then equals the size of parameters 
    length = method()->size_of_parameters();
  }

  StackValueCollection* result = new StackValueCollection(length);

  // Get oopmap describing oops and int for current bci
  InterpreterOopMap oop_mask;
  if (TraceDeoptimization && Verbose) {
    methodHandle m_h(thread(), method());
    OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
  } else {
    method()->mask_for(bci(), &oop_mask);
  }

  // handle locals
  for(int i=0; i < length; i++) {
    // Find stack location
    intptr_t *addr = locals_addr_at(i); 

    // Depending on oop/int put it in the right package
    StackValue *sv;    
    if (oop_mask.is_oop(i)) {
      // oop value
      Handle h(*(oop *)addr);
      sv = new StackValue(h);
    } else {
      // integer
      sv = new StackValue(*addr);
    }
    assert(sv != NULL, "sanity check");
    result->add(sv);
  }

  return result;
}

StackValueCollection* compiledVFrame::locals() const {
  // Natives has no scope
  if (scope() == NULL) return new StackValueCollection(0);
  GrowableArray<ScopeValue*>*  scv_list = scope()->locals();
  if (scv_list == NULL) return new StackValueCollection(0);

  // scv_list is the list of ScopeValues describing the JVM stack state.
  // There is one scv_list entry for every JVM stack state in use.
  int length = scv_list->length();
  StackValueCollection* result = new StackValueCollection(length);
  // In rare instances set_locals may have occurred in which case
  // there are local values that are not described by the ScopeValue anymore
  GrowableArray<jvmtiDeferredLocalVariable*>* deferred = NULL;
  GrowableArray<jvmtiDeferredLocalVariableSet*>* list = thread()->deferred_locals();
  if (list != NULL ) {
    // In real life this never happens or is typically a single element search
    for (int i = 0; i < list->length(); i++) {
      if (list->at(i)->matches((vframe*)this)) {
        deferred = list->at(i)->locals();
        break;
      }
    }
  }

  for( int i = 0; i < length; i++ ) {
    result->add( create_stack_value(scv_list->at(i)) );
  }

  // Replace specified locals with any deferred writes that are present
  if (deferred != NULL) {
    for ( int l = 0;  l < deferred->length() ; l ++) {
      jvmtiDeferredLocalVariable* val = deferred->at(l);
      switch (val->type()) {
      case T_BOOLEAN:
        result->set_int_at(val->index(), val->value().z);
        break;
      case T_CHAR:
        result->set_int_at(val->index(), val->value().c);
        break;
      case T_FLOAT:
        result->set_float_at(val->index(), val->value().f);
        break;
      case T_DOUBLE:
        result->set_double_at(val->index(), val->value().d);
        break;
      case T_BYTE:
        result->set_int_at(val->index(), val->value().b);
        break;
      case T_SHORT:
        result->set_int_at(val->index(), val->value().s);
        break;
      case T_INT:
        result->set_int_at(val->index(), val->value().i);
        break;
      case T_LONG:
        result->set_long_at(val->index(), val->value().j);
        break;
      case T_OBJECT:
        {
          Handle obj((oop)val->value().l);
          result->set_obj_at(val->index(), obj);
        }
        break;
      default:
        ShouldNotReachHere();
      }
    }
  }

  return result;
}