string-stream.cc.svn-base

Google浏览器V8内核代码

  return true;
}


void StringStream::PrintName(Object* name) {
  if (name->IsString()) {
    String* str = String::cast(name);
    if (str->length() > 0) {
      Put(str);
    } else {
      Add("/* anonymous */");
    }
  } else {
    Add("%o", name);
  }
}


void StringStream::PrintUsingMap(JSObject* js_object) {
  Map* map = js_object->map();
  if (!Heap::Contains(map) ||
      !map->IsHeapObject() ||
      !map->IsMap()) {
    Add("<Invalid map>\n");
    return;
  }
  for (DescriptorReader r(map->instance_descriptors()); !r.eos(); r.advance()) {
    switch (r.type()) {
      case FIELD: {
        Object* key = r.GetKey();
        if (key->IsString() || key->IsNumber()) {
          int len = 3;
          if (key->IsString()) {
            len = String::cast(key)->length();
          }
          for (; len < 18; len++)
            Put(' ');
          if (key->IsString()) {
            Put(String::cast(key));
          } else {
            key->ShortPrint();
          }
          Add(": ");
          Object* value = js_object->properties()->get(r.GetFieldIndex());
          Add("%o\n", value);
        }
      }
      break;
      default:
      break;
    }
  }
}


void StringStream::PrintFixedArray(FixedArray* array, unsigned int limit) {
  for (unsigned int i = 0; i < 10 && i < limit; i++) {
    Object* element = array->get(i);
    if (element != Heap::the_hole_value()) {
      for (int len = 1; len < 18; len++)
        Put(' ');
      Add("%d: %o\n", i, array->get(i));
    }
  }
  if (limit >= 10) {
    Add("                  ...\n");
  }
}


void StringStream::PrintByteArray(ByteArray* byte_array) {
  unsigned int limit = byte_array->length();
  for (unsigned int i = 0; i < 10 && i < limit; i++) {
    byte b = byte_array->get(i);
    Add("             %d: %3d 0x%02x", i, b, b);
    if (b >= ' ' && b <= '~') {
      Add(" '%c'", b);
    } else if (b == '\n') {
      Add(" '\n'");
    } else if (b == '\r') {
      Add(" '\r'");
    } else if (b >= 1 && b <= 26) {
      Add(" ^%c", b + 'A' - 1);
    }
    Add("\n");
  }
  if (limit >= 10) {
    Add("                  ...\n");
  }
}


void StringStream::PrintMentionedObjectCache() {
  Add("==== Key         ============================================\n\n");
  for (int i = 0; i < debug_object_cache->length(); i++) {
    HeapObject* printee = (*debug_object_cache)[i];
    Add(" #%d# %p: ", i, printee);
    printee->ShortPrint(this);
    Add("\n");
    if (printee->IsJSObject()) {
      if (printee->IsJSValue()) {
        Add("           value(): %o\n", JSValue::cast(printee)->value());
      }
      PrintUsingMap(JSObject::cast(printee));
      if (printee->IsJSArray()) {
        JSArray* array = JSArray::cast(printee);
        if (array->HasFastElements()) {
          unsigned int limit = FixedArray::cast(array->elements())->length();
          unsigned int length =
            static_cast<uint32_t>(JSArray::cast(array)->length()->Number());
          if (length < limit) limit = length;
          PrintFixedArray(FixedArray::cast(array->elements()), limit);
        }
      }
    } else if (printee->IsByteArray()) {
      PrintByteArray(ByteArray::cast(printee));
    } else if (printee->IsFixedArray()) {
      unsigned int limit = FixedArray::cast(printee)->length();
      PrintFixedArray(FixedArray::cast(printee), limit);
    }
  }
}


void StringStream::PrintSecurityTokenIfChanged(Object* f) {
  if (!f->IsHeapObject() || !Heap::Contains(HeapObject::cast(f))) {
    return;
  }
  Map* map = HeapObject::cast(f)->map();
  if (!map->IsHeapObject() ||
      !Heap::Contains(map) ||
      !map->IsMap() ||
      !f->IsJSFunction()) {
    return;
  }

  JSFunction* fun = JSFunction::cast(f);
  Object* perhaps_context = fun->unchecked_context();
  if (perhaps_context->IsHeapObject() &&
      Heap::Contains(HeapObject::cast(perhaps_context)) &&
      perhaps_context->IsContext()) {
    Context* context = fun->context();
    if (!Heap::Contains(context)) {
      Add("(Function context is outside heap)\n");
      return;
    }
    GlobalObject* global = context->global();
    if (!Heap::Contains(global)) {
      Add("(Function context global is outside heap)\n");
      return;
    }
    if (global->IsJSGlobalObject()) {
      Object* token = JSGlobalObject::cast(global)->security_token();
      if (token != current_security_token) {
        Add("Security context: %o\n", token);
        current_security_token = token;
      }
    } else {
      Add("(No security context)\n");
    }
  } else {
    Add("(Function context is corrupt)\n");
  }
}


void StringStream::PrintFunction(Object* f, Object* receiver, Code** code) {
  if (f->IsHeapObject() &&
      Heap::Contains(HeapObject::cast(f)) &&
      Heap::Contains(HeapObject::cast(f)->map()) &&
      HeapObject::cast(f)->map()->IsMap()) {
    if (f->IsJSFunction()) {
      JSFunction* fun = JSFunction::cast(f);
      // Common case: on-stack function present and resolved.
      PrintPrototype(fun, receiver);
      *code = fun->code();
    } else if (f->IsSymbol()) {
      // Unresolved and megamorphic calls: Instead of the function
      // we have the function name on the stack.
      PrintName(f);
      Add("/* unresolved */ ");
    } else {
      // Unless this is the frame of a built-in function, we should always have
      // the callee function or name on the stack. If we don't, we have a
      // problem or a change of the stack frame layout.
      Add("%o", f);
      Add("/* warning: no JSFunction object or function name found */ ");
    }
    /* } else if (is_trampoline()) {
       Print("trampoline ");
    */
  } else {
    if (!f->IsHeapObject()) {
      Add("/* warning: 'function' was not a heap object */ ");
      return;
    }
    if (!Heap::Contains(HeapObject::cast(f))) {
      Add("/* warning: 'function' was not on the heap */ ");
      return;
    }
    if (!Heap::Contains(HeapObject::cast(f)->map())) {
      Add("/* warning: function's map was not on the heap */ ");
      return;
    }
    if (!HeapObject::cast(f)->map()->IsMap()) {
      Add("/* warning: function's map was not a valid map */ ");
      return;
    }
    Add("/* warning: Invalid JSFunction object found */ ");
  }
}


void StringStream::PrintPrototype(JSFunction* fun, Object* receiver) {
  Object* name = fun->shared()->name();
  bool print_name = false;
  for (Object* p = receiver; p != Heap::null_value(); p = p->GetPrototype()) {
    if (p->IsJSObject()) {
      Object* key = JSObject::cast(p)->SlowReverseLookup(fun);
      if (key != Heap::undefined_value()) {
        if (!name->IsString() ||
            !key->IsString() ||
            !String::cast(name)->Equals(String::cast(key))) {
          print_name = true;
        }
        if (name->IsString() && String::cast(name)->length() == 0) {
          print_name = false;
        }
        name = key;
      }
    } else {
      print_name = true;
    }
  }
  PrintName(name);
  // Also known as - if the name in the function doesn't match the name under
  // which it was looked up.
  if (print_name) {
    Add("(aka ");
    PrintName(fun->shared()->name());
    Put(')');
  }
}


char* HeapStringAllocator::grow(unsigned* bytes) {
  unsigned new_bytes = *bytes * 2;
  // Check for overflow.
  if (new_bytes <= *bytes) {
    return space_;
  }
  char* new_space = NewArray<char>(new_bytes);
  if (new_space == NULL) {
    return space_;
  }
  memcpy(new_space, space_, *bytes);
  *bytes = new_bytes;
  DeleteArray(space_);
  space_ = new_space;
  return new_space;
}


char* NoAllocationStringAllocator::grow(unsigned* bytes) {
  unsigned new_bytes = *bytes * 2;
  if (new_bytes > size_) {
    new_bytes = size_;
  }
  *bytes = new_bytes;
  return space_;
}


} }  // namespace v8::internal