src/tint/lang/wgsl/ast/transform/offset_first_index_fuzz.cc

// Copyright 2024 The Dawn & Tint Authors
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#include "src/tint/cmd/fuzz/wgsl/fuzz.h"
#include "src/tint/lang/wgsl/ast/transform/offset_first_index.h"

namespace tint::ast::transform {
namespace {

bool CanRun(const Program& program, const OffsetFirstIndex::Config& config) {
    if ((config.first_instance_offset.value_or(0) & 3) != 0 ||
        (config.first_vertex_offset.value_or(0) & 3) != 0) {
        return false;  // Misaligned
    }

    if (config.first_instance_offset.has_value() &&
        config.first_instance_offset == config.first_vertex_offset) {
        return false;  // Offset collision
    }
    return true;
}

void OffsetFirstIndexFuzzer(const Program& program, const OffsetFirstIndex::Config& config) {
    if (!CanRun(program, config)) {
        return;
    }

    DataMap inputs;
    inputs.Add<OffsetFirstIndex::Config>(std::move(config));

    DataMap outputs;
    if (auto result = OffsetFirstIndex{}.Apply(program, inputs, outputs)) {
        if (!result->IsValid()) {
            TINT_ICE() << "OffsetFirstIndex returned invalid program:\n"
                       << Program::printer(*result) << "\n"
                       << result->Diagnostics();
        }
    }
}

}  // namespace
}  // namespace tint::ast::transform

TINT_WGSL_PROGRAM_FUZZER(tint::ast::transform::OffsetFirstIndexFuzzer);