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This enables the WGSL parsing of 'const' for only tint_unittests, allowing code to be split up into smaller chunks for review. Once all the logic is submitted to handle 'const', the test-only flag will be removed, and 'const' will be enabled for production. Bug: tint:1580 Change-Id: I3189b6bd15445ecc3fa1cd6f568885e7ba3c91c0 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/94680 Reviewed-by: David Neto <dneto@google.com> Commit-Queue: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
// Copyright 2020 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_VARIABLE_H_
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#define SRC_TINT_AST_VARIABLE_H_
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#include <utility>
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#include <vector>
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#include "src/tint/ast/access.h"
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#include "src/tint/ast/attribute.h"
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#include "src/tint/ast/expression.h"
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#include "src/tint/ast/storage_class.h"
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// Forward declarations
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namespace tint::ast {
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class BindingAttribute;
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class GroupAttribute;
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class LocationAttribute;
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class Type;
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} // namespace tint::ast
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namespace tint::ast {
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/// VariableBindingPoint holds a group and binding attribute.
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struct VariableBindingPoint {
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/// The `@group` part of the binding point
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const GroupAttribute* group = nullptr;
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/// The `@binding` part of the binding point
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const BindingAttribute* binding = nullptr;
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/// @returns true if the BindingPoint has a valid group and binding
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/// attribute.
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inline operator bool() const { return group && binding; }
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};
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/// Variable is the base class for Var, Let, Const, Override and Parameter.
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///
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/// An instance of this class represents one of five constructs in WGSL: "var" declaration, "let"
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/// declaration, "override" declaration, "const" declaration, or formal parameter to a function.
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///
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/// @see https://www.w3.org/TR/WGSL/#value-decls
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class Variable : public Castable<Variable, Node> {
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public:
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/// Constructor
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/// @param program_id the identifier of the program that owns this node
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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
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/// @param attributes the variable attributes
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Variable(ProgramID program_id,
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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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AttributeList attributes);
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/// Move constructor
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Variable(Variable&&);
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/// Destructor
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~Variable() override;
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/// @returns the binding point information from the variable's attributes.
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/// @note binding points should only be applied to Var and Parameter types.
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VariableBindingPoint BindingPoint() const;
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/// @returns the kind of the variable, which can be used in diagnostics
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/// e.g. "var", "let", "const", etc
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virtual const char* Kind() const = 0;
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/// The variable symbol
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const Symbol symbol;
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/// The declared variable type. This is null if the type is inferred, e.g.:
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/// let f = 1.0;
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/// var i = 1;
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const ast::Type* const type;
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/// The constructor expression or nullptr if none set
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const Expression* const constructor;
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/// The attributes attached to this variable
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const AttributeList attributes;
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};
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/// A list of variables
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using VariableList = std::vector<const Variable*>;
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} // namespace tint::ast
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#endif // SRC_TINT_AST_VARIABLE_H_
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