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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_FUZZERS_TRANSFORM_BUILDER_H_
#define SRC_TINT_FUZZERS_TRANSFORM_BUILDER_H_
#include <string>
#include <vector>
#include "include/tint/tint.h"
#include "src/tint/fuzzers/data_builder.h"
#include "src/tint/fuzzers/shuffle_transform.h"
#include "src/tint/lang/wgsl/ast/transform/binding_remapper.h"
#include "src/tint/lang/wgsl/ast/transform/robustness.h"
namespace tint::fuzzers {
/// Fuzzer utility class to build inputs for transforms and setup the transform
/// manager.
class TransformBuilder {
public:
/// @brief Initializes the internal builder using a seed value
/// @param seed - seed value passed to engine
explicit TransformBuilder(uint64_t seed) : builder_(seed) {}
/// @brief Initializes the internal builder using seed data
/// @param data - data fuzzer to calculate seed from
/// @param size - size of data buffer
explicit TransformBuilder(const uint8_t* data, size_t size) : builder_(data, size) {
assert(data != nullptr && "|data| must be !nullptr");
}
~TransformBuilder() = default;
/// @returns manager for transforms
transform::Manager* manager() { return &manager_; }
/// @returns data for transforms
transform::DataMap* data_map() { return &data_map_; }
/// Adds a transform and needed data to |manager_| and |data_map_|.
/// @tparam T - A class that inherits from ast::transform::Transform and has an
/// explicit specialization in AddTransformImpl.
template <typename T>
void AddTransform() {
static_assert(std::is_base_of<ast::transform::Transform, T>::value,
"T is not a ast::transform::Transform");
AddTransformImpl<T>::impl(this);
}
/// Helper that invokes Add*Transform for all of the platform independent
/// passes.
void AddPlatformIndependentPasses() {
AddTransform<ast::transform::FirstIndexOffset>();
AddTransform<ast::transform::BindingRemapper>();
AddTransform<ast::transform::Renamer>();
AddTransform<ast::transform::SingleEntryPoint>();
AddTransform<ast::transform::VertexPulling>();
}
private:
DataBuilder builder_;
transform::Manager manager_;
transform::DataMap data_map_;
DataBuilder* builder() { return &builder_; }
/// Implementation of AddTransform, specialized for each transform that is
/// implemented. Default implementation intentionally deleted to cause compile
/// error if unimplemented type passed in.
/// @tparam T - A fuzzer transform
template <typename T>
struct AddTransformImpl;
/// Implementation of AddTransform for ShuffleTransform
template <>
struct AddTransformImpl<ShuffleTransform> {
/// Add instance of ShuffleTransform to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) {
tb->manager()->Add<ShuffleTransform>(tb->builder_.build<size_t>());
}
};
/// Implementation of AddTransform for ast::transform::Robustness
template <>
struct AddTransformImpl<ast::transform::Robustness> {
/// Add instance of ast::transform::Robustness to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) { tb->manager()->Add<ast::transform::Robustness>(); }
};
/// Implementation of AddTransform for ast::transform::FirstIndexOffset
template <>
struct AddTransformImpl<ast::transform::FirstIndexOffset> {
/// Add instance of ast::transform::FirstIndexOffset to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) {
struct Config {
uint32_t group;
uint32_t binding;
};
Config config = tb->builder()->build<Config>();
tb->data_map()->Add<tint::ast::transform::FirstIndexOffset::BindingPoint>(
config.binding, config.group);
tb->manager()->Add<ast::transform::FirstIndexOffset>();
}
};
/// Implementation of AddTransform for ast::transform::BindingRemapper
template <>
struct AddTransformImpl<ast::transform::BindingRemapper> {
/// Add instance of ast::transform::BindingRemapper to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) {
struct Config {
uint8_t old_group;
uint8_t old_binding;
uint8_t new_group;
uint8_t new_binding;
builtin::Access new_access;
};
std::vector<Config> configs = tb->builder()->vector<Config>();
ast::transform::BindingRemapper::BindingPoints binding_points;
ast::transform::BindingRemapper::AccessControls accesses;
for (const auto& config : configs) {
binding_points[{config.old_binding, config.old_group}] = {config.new_binding,
config.new_group};
accesses[{config.old_binding, config.old_group}] = config.new_access;
}
tb->data_map()->Add<ast::transform::BindingRemapper::Remappings>(
binding_points, accesses, tb->builder()->build<bool>());
tb->manager()->Add<ast::transform::BindingRemapper>();
}
};
/// Implementation of AddTransform for ast::transform::Renamer
template <>
struct AddTransformImpl<ast::transform::Renamer> {
/// Add instance of ast::transform::Renamer to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) { tb->manager()->Add<ast::transform::Renamer>(); }
};
/// Implementation of AddTransform for ast::transform::SingleEntryPoint
template <>
struct AddTransformImpl<ast::transform::SingleEntryPoint> {
/// Add instance of ast::transform::SingleEntryPoint to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) {
auto input = tb->builder()->build<std::string>();
ast::transform::SingleEntryPoint::Config cfg(input);
tb->data_map()->Add<ast::transform::SingleEntryPoint::Config>(cfg);
tb->manager()->Add<ast::transform::SingleEntryPoint>();
}
}; // struct AddTransformImpl<ast::transform::SingleEntryPoint>
/// Implementation of AddTransform for ast::transform::VertexPulling
template <>
struct AddTransformImpl<ast::transform::VertexPulling> {
/// Add instance of ast::transform::VertexPulling to TransformBuilder
/// @param tb - TransformBuilder to add transform to
static void impl(TransformBuilder* tb) {
ast::transform::VertexPulling::Config cfg;
cfg.vertex_state = tb->builder()->vector<ast::transform::VertexBufferLayoutDescriptor>(
GenerateVertexBufferLayoutDescriptor);
cfg.pulling_group = tb->builder()->build<uint32_t>();
tb->data_map()->Add<ast::transform::VertexPulling::Config>(cfg);
tb->manager()->Add<ast::transform::VertexPulling>();
}
private:
/// Generate an instance of ast::transform::VertexAttributeDescriptor
/// @param b - DataBuilder to use
static ast::transform::VertexAttributeDescriptor GenerateVertexAttributeDescriptor(
DataBuilder* b) {
ast::transform::VertexAttributeDescriptor desc{};
desc.format = b->enum_class<ast::transform::VertexFormat>(
static_cast<uint8_t>(ast::transform::VertexFormat::kLastEntry) + 1);
desc.offset = b->build<uint32_t>();
desc.shader_location = b->build<uint32_t>();
return desc;
}
/// Generate an instance of VertexBufferLayoutDescriptor
/// @param b - DataBuilder to use
static ast::transform::VertexBufferLayoutDescriptor GenerateVertexBufferLayoutDescriptor(
DataBuilder* b) {
ast::transform::VertexBufferLayoutDescriptor desc;
desc.array_stride = b->build<uint32_t>();
desc.step_mode = b->enum_class<ast::transform::VertexStepMode>(
static_cast<uint8_t>(ast::transform::VertexStepMode::kLastEntry) + 1);
desc.attributes = b->vector<ast::transform::VertexAttributeDescriptor>(
GenerateVertexAttributeDescriptor);
return desc;
}
};
}; // class TransformBuilder
} // namespace tint::fuzzers
#endif // SRC_TINT_FUZZERS_TRANSFORM_BUILDER_H_