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tint: Add TINT_REFLECT() & ForeachField()
This uses template and macro magic to reflect the fields of a class. Dawn: * Reflect the fields of the types that are used by Dawn's stream::Stream<T> specializations, and use tint::ForeachField() to call StreamIn(). Fuzzers: * Replace tint::fuzzers::DataBuilder::BuildImpl<T> specializations with the new reflection system. * static_assert that the type is either POD or reflected. Add a specialization for std::optional which was missing. Move tint::transform::BindingPoints into MultiplanarExternalTexture, as this is only used by MultiplanarExternalTexture. All this reduces fragility of the struct declarations slipping out of sync with the uses. Bug: tint:1640 Change-Id: I08729c1c356f1b427e85983efe3c2678fc2ce717 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/101001 Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Ben Clayton <bclayton@chromium.org>
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Ben Clayton
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Dawn LUCI CQ
Dawn LUCI CQ
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commit
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91
src/tint/utils/foreach_macro.h
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91
src/tint/utils/foreach_macro.h
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// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_UTILS_FOREACH_MACRO_H_
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#define SRC_TINT_UTILS_FOREACH_MACRO_H_
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// Macro magic to perform macro variadic dispatch.
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// See:
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// https://renenyffenegger.ch/notes/development/languages/C-C-plus-plus/preprocessor/macros/__VA_ARGS__/count-arguments
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// Note, this doesn't attempt to use the ##__VA_ARGS__ trick to handle 0
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// Helper macro to force expanding __VA_ARGS__ to satisfy MSVC compiler.
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#define TINT_MSVC_EXPAND_BUG(X) X
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/// TINT_COUNT_ARGUMENTS_NTH_ARG is used by TINT_COUNT_ARGUMENTS to get the number of arguments in a
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/// variadic macro call.
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#define TINT_COUNT_ARGUMENTS_NTH_ARG(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, \
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_15, _16, N, ...) \
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N
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/// TINT_COUNT_ARGUMENTS evaluates to the number of arguments passed to the macro
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#define TINT_COUNT_ARGUMENTS(...) \
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TINT_MSVC_EXPAND_BUG(TINT_COUNT_ARGUMENTS_NTH_ARG(__VA_ARGS__, 16, 15, 14, 13, 12, 11, 10, 9, \
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8, 7, 6, 5, 4, 3, 2, 1, 0))
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// Correctness checks.
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static_assert(1 == TINT_COUNT_ARGUMENTS(a), "TINT_COUNT_ARGUMENTS broken");
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static_assert(2 == TINT_COUNT_ARGUMENTS(a, b), "TINT_COUNT_ARGUMENTS broken");
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static_assert(3 == TINT_COUNT_ARGUMENTS(a, b, c), "TINT_COUNT_ARGUMENTS broken");
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/// TINT_FOREACH calls CB with each of the variadic arguments.
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#define TINT_FOREACH(CB, ...) \
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TINT_MSVC_EXPAND_BUG( \
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TINT_CONCAT(TINT_FOREACH_, TINT_COUNT_ARGUMENTS(__VA_ARGS__))(CB, __VA_ARGS__))
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#define TINT_FOREACH_1(CB, _1) CB(_1)
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#define TINT_FOREACH_2(CB, _1, _2) \
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TINT_FOREACH_1(CB, _1) \
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CB(_2)
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#define TINT_FOREACH_3(CB, _1, _2, _3) \
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TINT_FOREACH_2(CB, _1, _2) \
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CB(_3)
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#define TINT_FOREACH_4(CB, _1, _2, _3, _4) \
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TINT_FOREACH_3(CB, _1, _2, _3) \
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CB(_4)
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#define TINT_FOREACH_5(CB, _1, _2, _3, _4, _5) \
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TINT_FOREACH_4(CB, _1, _2, _3, _4) \
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CB(_5)
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#define TINT_FOREACH_6(CB, _1, _2, _3, _4, _5, _6) \
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TINT_FOREACH_5(CB, _1, _2, _3, _4, _5) \
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CB(_6)
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#define TINT_FOREACH_7(CB, _1, _2, _3, _4, _5, _6, _7) \
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TINT_FOREACH_6(CB, _1, _2, _3, _4, _5, _6) \
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CB(_7)
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#define TINT_FOREACH_8(CB, _1, _2, _3, _4, _5, _6, _7, _8) \
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TINT_FOREACH_7(CB, _1, _2, _3, _4, _5, _6, _7) \
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CB(_8)
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#define TINT_FOREACH_9(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
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TINT_FOREACH_8(CB, _1, _2, _3, _4, _5, _6, _7, _8) \
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CB(_9)
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#define TINT_FOREACH_10(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
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TINT_FOREACH_9(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
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CB(_10)
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#define TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
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TINT_FOREACH_10(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
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CB(_11)
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#define TINT_FOREACH_12(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
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TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
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CB(_12)
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#define TINT_FOREACH_13(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
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TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
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CB(_13)
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#define TINT_FOREACH_14(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
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TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
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CB(_14)
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#define TINT_FOREACH_15(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
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TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
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CB(_15)
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#endif // SRC_TINT_UTILS_FOREACH_MACRO_H_
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