src/utils/raw_span_tests.cc

// Copyright 2026 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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//    this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include <memory>
#include <vector>

#include "src/utils/gtest.h"
#include "src/utils/span.h"
#include "src/utils/typed_integer.h"

namespace dawn {
namespace {

using Index = TypedInteger<struct IndexT, uint32_t>;

TEST(RawSpanDanglingDeathTest, Constructor) {
    auto owner = std::make_unique<std::vector<int>>(std::initializer_list<int>{1, 2, 3});
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sp = RawSpan<int>{*owner};
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub = RawSpan<int>{*owner}.subspan(1u);
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sp =
                // SAFETY: This is viewing owner, just with typed indices.
                DAWN_UNSAFE_BUFFERS((ityp::raw_span<Index, int>{owner->data(), Index{3u}}));
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub =
                // SAFETY: This is viewing owner, just with typed indices.
                DAWN_UNSAFE_BUFFERS((ityp::raw_span<Index, int>{owner->data(), Index{3u}}))
                    .subspan(Index{1u});
            owner.reset();
        },
        "");
}

TEST(RawSpanDanglingDeathTest, SpanAsBytes) {
    auto owner = std::make_unique<std::vector<int>>(std::initializer_list<int>{1, 2, 3});
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto bsp = SpanAsBytes(RawSpan<int>{*owner});
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub = SpanAsBytes(RawSpan<int>{*owner}).subspan(1u);
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto wbsp = SpanAsWritableBytes(RawSpan<int>{*owner});
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub = SpanAsWritableBytes(RawSpan<int>{*owner}).subspan(1u);
            owner.reset();
        },
        "");
}

TEST(RawSpanDanglingDeathTest, ReinterpretSpan) {
    auto owner = std::make_unique<std::vector<std::byte>>(4 * sizeof(int));
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sp = ReinterpretSpan<int>(RawSpan<std::byte>{*owner});
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub =
                ReinterpretSpan<int>(RawSpan<std::byte>{*owner}).subspan(1u);
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sp = (ReinterpretSpan<int, Index>(RawSpan<std::byte>{*owner}));
            owner.reset();
        },
        "");
    EXPECT_DEATH_IF_SUPPORTED(
        {
            [[maybe_unused]] auto sub =
                (ReinterpretSpan<int, Index>(RawSpan<std::byte>{*owner})).subspan(Index{1u});
            owner.reset();
        },
        "");
}

}  // anonymous namespace
}  // namespace dawn