Move atomic to type/

This CL moves atomic to type/ and updates the namespaces.

Bug: tint:1718
Change-Id: I3331bc0dfae2ccede52b5589b7d3cc443366096a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/113424
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>

src/tint/type/atomic.cc

@@ -0,0 +1,63 @@
+// Copyright 2022 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/type/atomic.h"
+
+#include "src/tint/program_builder.h"
+#include "src/tint/type/reference.h"
+#include "src/tint/utils/hash.h"
+
+TINT_INSTANTIATE_TYPEINFO(tint::type::Atomic);
+
+namespace tint::type {
+
+Atomic::Atomic(const type::Type* subtype)
+    : Base(type::TypeFlags{
+          Flag::kCreationFixedFootprint,
+          Flag::kFixedFootprint,
+      }),
+      subtype_(subtype) {
+    TINT_ASSERT(AST, !subtype->Is<type::Reference>());
+}
+
+size_t Atomic::Hash() const {
+    return utils::Hash(TypeInfo::Of<Atomic>().full_hashcode, subtype_);
+}
+
+bool Atomic::Equals(const type::Type& other) const {
+    if (auto* o = other.As<Atomic>()) {
+        return o->subtype_ == subtype_;
+    }
+    return false;
+}
+
+std::string Atomic::FriendlyName(const SymbolTable& symbols) const {
+    std::ostringstream out;
+    out << "atomic<" << subtype_->FriendlyName(symbols) << ">";
+    return out.str();
+}
+
+uint32_t Atomic::Size() const {
+    return subtype_->Size();
+}
+
+uint32_t Atomic::Align() const {
+    return subtype_->Align();
+}
+
+Atomic::Atomic(Atomic&&) = default;
+
+Atomic::~Atomic() = default;
+
+}  // namespace tint::type

src/tint/type/atomic.h

@@ -0,0 +1,62 @@
+// Copyright 2022 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_TYPE_ATOMIC_H_
+#define SRC_TINT_TYPE_ATOMIC_H_
+
+#include <string>
+
+#include "src/tint/type/type.h"
+
+namespace tint::type {
+
+/// A atomic type.
+class Atomic final : public Castable<Atomic, type::Type> {
+  public:
+    /// Constructor
+    /// @param subtype the atomic type
+    explicit Atomic(const type::Type* subtype);
+
+    /// Move constructor
+    Atomic(Atomic&&);
+    ~Atomic() override;
+
+    /// @returns a hash of the type.
+    size_t Hash() const override;
+
+    /// @param other the other type to compare against
+    /// @returns true if the this type is equal to the given type
+    bool Equals(const Type& other) const override;
+
+    /// @returns the atomic type
+    const type::Type* Type() const { return subtype_; }
+
+    /// @param symbols the program's symbol table
+    /// @returns the name for this type that closely resembles how it would be
+    /// declared in WGSL.
+    std::string FriendlyName(const SymbolTable& symbols) const override;
+
+    /// @returns the size in bytes of the type.
+    uint32_t Size() const override;
+
+    /// @returns the alignment in bytes of the type.
+    uint32_t Align() const override;
+
+  private:
+    type::Type const* const subtype_;
+};
+
+}  // namespace tint::type
+
+#endif  // SRC_TINT_TYPE_ATOMIC_H_

src/tint/type/atomic_test.cc

@@ -0,0 +1,56 @@
+// Copyright 2022 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/type/atomic.h"
+
+#include "src/tint/type/test_helper.h"
+
+namespace tint::type {
+namespace {
+
+using AtomicTest = TestHelper;
+
+TEST_F(AtomicTest, Creation) {
+    auto* a = create<Atomic>(create<type::I32>());
+    auto* b = create<Atomic>(create<type::I32>());
+    auto* c = create<Atomic>(create<type::U32>());
+    EXPECT_TRUE(a->Type()->Is<type::I32>());
+    EXPECT_EQ(a, b);
+    EXPECT_NE(a, c);
+}
+
+TEST_F(AtomicTest, Hash) {
+    auto* a = create<Atomic>(create<type::I32>());
+    auto* b = create<Atomic>(create<type::I32>());
+    auto* c = create<Atomic>(create<type::U32>());
+    EXPECT_EQ(a->Hash(), b->Hash());
+    EXPECT_NE(a->Hash(), c->Hash());
+}
+
+TEST_F(AtomicTest, Equals) {
+    auto* a = create<Atomic>(create<type::I32>());
+    auto* b = create<Atomic>(create<type::I32>());
+    auto* c = create<Atomic>(create<type::U32>());
+    EXPECT_TRUE(a->Equals(*b));
+    EXPECT_FALSE(a->Equals(*c));
+    EXPECT_FALSE(a->Equals(type::Void{}));
+}
+
+TEST_F(AtomicTest, FriendlyName) {
+    auto* a = create<Atomic>(create<type::I32>());
+    EXPECT_EQ(a->FriendlyName(Symbols()), "atomic<i32>");
+}
+
+}  // namespace
+}  // namespace tint::type