tint->dawn: Shuffle source tree in preperation of merging repos
docs/ -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/ -> src/tint/
test/ -> test/tint/
BUG=tint:1418,tint:1433
Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/src/tint/ast/struct_member_offset_attribute.h b/src/tint/ast/struct_member_offset_attribute.h
new file mode 100644
index 0000000..f599a7e
--- /dev/null
+++ b/src/tint/ast/struct_member_offset_attribute.h
@@ -0,0 +1,63 @@
+// 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.
+
+#ifndef SRC_TINT_AST_STRUCT_MEMBER_OFFSET_ATTRIBUTE_H_
+#define SRC_TINT_AST_STRUCT_MEMBER_OFFSET_ATTRIBUTE_H_
+
+#include <string>
+
+#include "src/tint/ast/attribute.h"
+
+namespace tint {
+namespace ast {
+
+/// A struct member offset attribute
+/// @note The WGSL spec removed the `@offset(n)` attribute for `@size(n)`
+/// and `@align(n)` in https://github.com/gpuweb/gpuweb/pull/1447. However
+/// this attribute is kept because the SPIR-V reader has to deal with absolute
+/// offsets, and transforming these to size / align is complex and can be done
+/// in a number of ways. The Resolver is responsible for consuming the size and
+/// align attributes and transforming these into absolute offsets. It is
+/// trivial for the Resolver to handle `@offset(n)` or `@size(n)` /
+/// `@align(n)` attributes, so this is what we do, keeping all the layout
+/// logic in one place.
+class StructMemberOffsetAttribute
+ : public Castable<StructMemberOffsetAttribute, Attribute> {
+ public:
+ /// constructor
+ /// @param pid the identifier of the program that owns this node
+ /// @param src the source of this node
+ /// @param offset the offset value
+ StructMemberOffsetAttribute(ProgramID pid,
+ const Source& src,
+ uint32_t offset);
+ ~StructMemberOffsetAttribute() override;
+
+ /// @returns the WGSL name for the attribute
+ std::string Name() const override;
+
+ /// Clones this node and all transitive child nodes using the `CloneContext`
+ /// `ctx`.
+ /// @param ctx the clone context
+ /// @return the newly cloned node
+ const StructMemberOffsetAttribute* Clone(CloneContext* ctx) const override;
+
+ /// The offset value
+ const uint32_t offset;
+};
+
+} // namespace ast
+} // namespace tint
+
+#endif // SRC_TINT_AST_STRUCT_MEMBER_OFFSET_ATTRIBUTE_H_
