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// Copyright 2020 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.
#include "src/tint/lang/wgsl/ast/transform/transform.h"
#include <algorithm>
#include <string>
#include "src/tint/lang/core/builtin_type.h"
#include "src/tint/lang/core/fluent_types.h"
#include "src/tint/lang/core/type/atomic.h"
#include "src/tint/lang/core/type/depth_multisampled_texture.h"
#include "src/tint/lang/core/type/reference.h"
#include "src/tint/lang/core/type/sampler.h"
#include "src/tint/lang/wgsl/program/clone_context.h"
#include "src/tint/lang/wgsl/program/program_builder.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"
#include "src/tint/lang/wgsl/sem/block_statement.h"
#include "src/tint/lang/wgsl/sem/for_loop_statement.h"
#include "src/tint/lang/wgsl/sem/variable.h"
using namespace tint::core::fluent_types; // NOLINT
TINT_INSTANTIATE_TYPEINFO(tint::ast::transform::Transform);
namespace tint::ast::transform {
Output::Output() = default;
Output::Output(Program&& p) : program(std::move(p)) {}
Transform::Transform() = default;
Transform::~Transform() = default;
Output Transform::Run(const Program& src, const DataMap& data /* = {} */) const {
Output output;
if (auto program = Apply(src, data, output.data)) {
output.program = std::move(program.value());
} else {
ProgramBuilder b;
program::CloneContext ctx{&b, &src, /* auto_clone_symbols */ true};
ctx.Clone();
output.program = resolver::Resolve(b);
}
return output;
}
void Transform::RemoveStatement(program::CloneContext& ctx, const Statement* stmt) {
auto* sem = ctx.src->Sem().Get(stmt);
if (auto* block = tint::As<sem::BlockStatement>(sem->Parent())) {
ctx.Remove(block->Declaration()->statements, stmt);
return;
}
if (TINT_LIKELY(tint::Is<sem::ForLoopStatement>(sem->Parent()))) {
ctx.Replace(stmt, static_cast<Expression*>(nullptr));
return;
}
TINT_ICE() << "unable to remove statement from parent of type " << sem->TypeInfo().name;
}
Type Transform::CreateASTTypeFor(program::CloneContext& ctx, const core::type::Type* ty) {
if (ty->Is<core::type::Void>()) {
return Type{};
}
if (ty->Is<core::type::I32>()) {
return ctx.dst->ty.i32();
}
if (ty->Is<core::type::U32>()) {
return ctx.dst->ty.u32();
}
if (ty->Is<core::type::F16>()) {
return ctx.dst->ty.f16();
}
if (ty->Is<core::type::F32>()) {
return ctx.dst->ty.f32();
}
if (ty->Is<core::type::Bool>()) {
return ctx.dst->ty.bool_();
}
if (auto* m = ty->As<core::type::Matrix>()) {
auto el = CreateASTTypeFor(ctx, m->type());
return ctx.dst->ty.mat(el, m->columns(), m->rows());
}
if (auto* v = ty->As<core::type::Vector>()) {
auto el = CreateASTTypeFor(ctx, v->type());
if (v->Packed()) {
TINT_ASSERT(v->Width() == 3u);
return ctx.dst->ty(core::BuiltinType::kPackedVec3, el);
} else {
return ctx.dst->ty.vec(el, v->Width());
}
}
if (auto* a = ty->As<core::type::Array>()) {
auto el = CreateASTTypeFor(ctx, a->ElemType());
tint::Vector<const Attribute*, 1> attrs;
if (!a->IsStrideImplicit()) {
attrs.Push(ctx.dst->create<StrideAttribute>(a->Stride()));
}
if (a->Count()->Is<core::type::RuntimeArrayCount>()) {
return ctx.dst->ty.array(el, std::move(attrs));
}
if (auto* override = a->Count()->As<sem::NamedOverrideArrayCount>()) {
auto* count = ctx.Clone(override->variable->Declaration());
return ctx.dst->ty.array(el, count, std::move(attrs));
}
if (auto* override = a->Count()->As<sem::UnnamedOverrideArrayCount>()) {
// If the array count is an unnamed (complex) override expression, then its not safe to
// redeclare this type as we'd end up with two types that would not compare equal.
// See crbug.com/tint/1764.
// Look for a type alias for this array.
for (auto* type_decl : ctx.src->AST().TypeDecls()) {
if (auto* alias = type_decl->As<Alias>()) {
if (ty == ctx.src->Sem().Get(alias)) {
// Alias found. Use the alias name to ensure types compare equal.
return ctx.dst->ty(ctx.Clone(alias->name->symbol));
}
}
}
// Array is not aliased. Rebuild the array.
auto* count = ctx.Clone(override->expr->Declaration());
return ctx.dst->ty.array(el, count, std::move(attrs));
}
auto count = a->ConstantCount();
if (TINT_UNLIKELY(!count)) {
TINT_ICE() << core::type::Array::kErrExpectedConstantCount;
return ctx.dst->ty.array(el, u32(1), std::move(attrs));
}
return ctx.dst->ty.array(el, u32(count.value()), std::move(attrs));
}
if (auto* s = ty->As<core::type::Struct>()) {
return ctx.dst->ty(ctx.Clone(s->Name()));
}
if (auto* s = ty->As<core::type::Reference>()) {
return CreateASTTypeFor(ctx, s->StoreType());
}
if (auto* a = ty->As<core::type::Atomic>()) {
return ctx.dst->ty.atomic(CreateASTTypeFor(ctx, a->Type()));
}
if (auto* t = ty->As<core::type::DepthTexture>()) {
return ctx.dst->ty.depth_texture(t->dim());
}
if (auto* t = ty->As<core::type::DepthMultisampledTexture>()) {
return ctx.dst->ty.depth_multisampled_texture(t->dim());
}
if (ty->Is<core::type::ExternalTexture>()) {
return ctx.dst->ty.external_texture();
}
if (auto* t = ty->As<core::type::MultisampledTexture>()) {
return ctx.dst->ty.multisampled_texture(t->dim(), CreateASTTypeFor(ctx, t->type()));
}
if (auto* t = ty->As<core::type::SampledTexture>()) {
return ctx.dst->ty.sampled_texture(t->dim(), CreateASTTypeFor(ctx, t->type()));
}
if (auto* t = ty->As<core::type::StorageTexture>()) {
return ctx.dst->ty.storage_texture(t->dim(), t->texel_format(), t->access());
}
if (auto* s = ty->As<core::type::Sampler>()) {
return ctx.dst->ty.sampler(s->kind());
}
if (auto* p = ty->As<core::type::Pointer>()) {
// Note: core::type::Pointer always has an inferred access, but WGSL only allows an explicit
// access in the 'storage' address space.
auto address_space = p->AddressSpace();
auto access =
address_space == core::AddressSpace::kStorage ? p->Access() : core::Access::kUndefined;
return ctx.dst->ty.ptr(address_space, CreateASTTypeFor(ctx, p->StoreType()), access);
}
TINT_UNREACHABLE() << "Unhandled type: " << ty->TypeInfo().name;
return Type{};
}
} // namespace tint::ast::transform