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783b169bf4
Change-Id: I10dd2feeaeb86a1ee7769d2bfd172e49c2805cb3 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97843 Reviewed-by: Dan Sinclair <dsinclair@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@google.com>
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
// 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_AST_CONST_H_
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#define SRC_TINT_AST_CONST_H_
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#include "src/tint/ast/variable.h"
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namespace tint::ast {
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/// A "const" declaration is a name for a module-scoped or function-scoped creation-time value.
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/// const must have a constructor expression.
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///
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/// Examples:
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///
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/// ```
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/// const n = 123; // Abstract-integer typed constant
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/// const pi = 3.14159265359; // Abstract-float typed constant
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/// const max_f32 : f32 = 0x1.fffffep+127; // f32 typed constant
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/// ```
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/// @see https://www.w3.org/TR/WGSL/#creation-time-consts
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class Const final : public Castable<Const, Variable> {
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public:
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/// Create a 'const' creation-time value variable.
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/// @param pid the identifier of the program that owns this node
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/// @param nid the unique node identifier
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/// @param source the variable source
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/// @param sym the variable symbol
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/// @param type the declared variable type
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/// @param constructor the constructor expression. Must not be nullptr.
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/// @param attributes the variable attributes
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Const(ProgramID pid,
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NodeID nid,
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const Source& source,
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const Symbol& sym,
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const ast::Type* type,
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const Expression* constructor,
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utils::VectorRef<const Attribute*> attributes);
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/// Move constructor
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Const(Const&&);
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/// Destructor
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~Const() override;
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/// @returns "const"
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const char* Kind() const override;
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/// Clones this node and all transitive child nodes using the `CloneContext`
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/// `ctx`.
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/// @param ctx the clone context
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/// @return the newly cloned node
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const Const* Clone(CloneContext* ctx) const override;
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};
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} // namespace tint::ast
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#endif // SRC_TINT_AST_CONST_H_
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