src/developer/debug/zxdb/expr/expr_value_unittest.cc

// Copyright 2021 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/developer/debug/zxdb/expr/expr_value.h"

#include <gtest/gtest.h>

#include "src/developer/debug/zxdb/symbols/base_type.h"

namespace zxdb {

TEST(ExprValue, PromoteTo) {
  ExprValue byte_minus_one(static_cast<int8_t>(-1));

  // Unsigned promotion just copies the bits.
  uint64_t u64 = 0;
  EXPECT_TRUE(byte_minus_one.PromoteTo64(&u64).ok());
  EXPECT_EQ(255u, u64);

  uint128_t u128 = 0;
  EXPECT_TRUE(byte_minus_one.PromoteTo128(&u128).ok());
  EXPECT_EQ(255u, u128);

  // Signed conversion gets a sign expansion.
  int64_t i64 = 0;
  EXPECT_TRUE(byte_minus_one.PromoteTo64(&i64).ok());
  EXPECT_EQ(-1ll, i64);

  int128_t i128 = 0;
  EXPECT_TRUE(byte_minus_one.PromoteTo128(&i128).ok());
  EXPECT_EQ(-1ll, i128);

  // 5 byte value is an error.
  ExprValue five_bytes(fxl::MakeRefCounted<BaseType>(BaseType::kBaseTypeSigned, 5, "int40_t"),
                       {1, 1, 1, 1, 1});
  Err err = five_bytes.PromoteTo64(&i64);
  EXPECT_FALSE(err.ok());
  EXPECT_EQ("Unexpected value size (5), please file a bug.", err.msg());

  // Empty value is an error.
  ExprValue empty;
  err = empty.PromoteTo64(&i64);
  EXPECT_FALSE(err.ok());
  EXPECT_EQ("Value has no data.", err.msg());
}

}  // namespace zxdb