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ac512d4341
We cannot use unowned strings for token texts of incrementally parsed syntax trees since the source buffer to which reused nodes refer will have been freed for reused nodes. Always copying the token text whenever OwnedString is passed is too expensive. A reference counted copy of the string allows us to keep the token's string alive across incremental parses while eliminating unnecessary copies.
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
//===--- OwnedStringTest.cpp ----------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/OwnedString.h"
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#include "gtest/gtest.h"
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using namespace swift;
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TEST(OwnedStringTest, char_pointer_empty) {
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const char *data = "";
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const size_t length = strlen(data);
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OwnedString ownedString = OwnedString::makeUnowned(data);
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EXPECT_EQ(length, ownedString.size());
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EXPECT_TRUE(ownedString.empty());
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EXPECT_EQ(data, ownedString.str().data());
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}
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TEST(OwnedStringTest, char_pointer_non_empty) {
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const char *data = "string";
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const size_t length = strlen(data);
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OwnedString ownedString = OwnedString::makeUnowned(data);
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EXPECT_EQ(length, ownedString.size());
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EXPECT_FALSE(ownedString.empty());
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EXPECT_EQ(data, ownedString.str().data());
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}
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TEST(OwnedStringTest, ref_counted_copies_buffer) {
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char *data = static_cast<char *>(malloc(6));
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memcpy(data, "hello", 6);
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size_t length = strlen(data);
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OwnedString ownedString =
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OwnedString::makeRefCounted(StringRef(data, length));
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EXPECT_EQ(ownedString.str(), "hello");
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EXPECT_NE(ownedString.str().data(), data);
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memcpy(data, "world", 6);
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// Even if the original buffer changes, the string should stay the same
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EXPECT_EQ(ownedString.str(), "hello");
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}
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TEST(OwnedStringTest, ref_counted_assignment) {
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OwnedString str = OwnedString::makeRefCounted("hello");
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OwnedString copy = str;
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EXPECT_EQ(str.str().data(), copy.str().data());
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}
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