// Copyright (c) Facebook, Inc. and its affiliates. (http://www.facebook.com)
#include "symbols.h"

#include "runtime.h"
#include "visitor.h"

namespace py {

// clang-format off
static const char* kPredefinedSymbols[] = {
#define DEFINE_SYMBOL(symbol) #symbol,
  FOREACH_SYMBOL(DEFINE_SYMBOL)
#undef DEFINE_SYMBOL
};
// clang-format on

Symbols::Symbols(Runtime* runtime) {
  auto num_symbols = static_cast<uword>(SymbolId::kMaxId);
  uword symbol_size = sizeof(*symbols_);
  symbols_ = static_cast<RawObject*>(std::calloc(num_symbols, symbol_size));
  CHECK(symbols_ != nullptr, "could not allocate memory for symbol table");
  for (uword i = 0; i < num_symbols; i++) {
    symbols_[i] = runtime->newStrFromCStr(kPredefinedSymbols[i]);
  }
}

Symbols::~Symbols() { std::free(symbols_); }

void Symbols::visit(PointerVisitor* visitor) {
  for (word i = 0; i < static_cast<int>(SymbolId::kMaxId); i++) {
    visitor->visitPointer(&symbols_[i], PointerKind::kRuntime);
  }
}

const char* Symbols::predefinedSymbolAt(SymbolId id) {
  int index = static_cast<int>(id);
  DCHECK_INDEX(index, static_cast<int>(SymbolId::kMaxId));
  return kPredefinedSymbols[index];
}

}  // namespace py