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4cc4315d6c
Change ast::Array to use an ast::Expression for its `size` field. The WGSL frontend now parses the array size as an `primary_expression`, and the Resolver is responsible for validating the expression is a signed or unsigned integer, and either a literal or a non-overridable module-scope constant. The Resolver evaluates the constant value of the size expression, and so the resolved sem::Array type still has a constant size as before. Fixed: tint:1068 Fixed: tint:1117 Change-Id: Icfa141482ea1e47ea8c21a25e9eb48221f176e9a Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/63061 Auto-Submit: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: James Price <jrprice@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
104 lines
3.0 KiB
C++
104 lines
3.0 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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#include "src/ast/array.h"
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#include <cmath>
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#include "src/program_builder.h"
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TINT_INSTANTIATE_TYPEINFO(tint::ast::Array);
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namespace tint {
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namespace ast {
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namespace {
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// Returns the string representation of an array size expression.
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std::string SizeExprToString(const ast::Expression* size,
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const SymbolTable* symbols = nullptr) {
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if (auto* ident = size->As<ast::IdentifierExpression>()) {
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if (symbols) {
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return symbols->NameFor(ident->symbol());
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} else {
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return ident->symbol().to_str();
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}
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} else if (auto* scalar = size->As<ast::ScalarConstructorExpression>()) {
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auto* literal = scalar->literal()->As<ast::IntLiteral>();
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if (literal) {
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return std::to_string(literal->value_as_u32());
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}
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}
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// This will never be exposed to the user as the Resolver will reject this
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// expression for array size.
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return "<invalid>";
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}
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} // namespace
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Array::Array(ProgramID program_id,
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const Source& source,
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Type* subtype,
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ast::Expression* size,
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ast::DecorationList decorations)
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: Base(program_id, source),
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subtype_(subtype),
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size_(size),
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decos_(decorations) {}
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Array::Array(Array&&) = default;
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Array::~Array() = default;
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std::string Array::type_name() const {
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TINT_ASSERT(AST, subtype_);
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std::string type_name = "__array" + subtype_->type_name();
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if (!IsRuntimeArray()) {
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type_name += "_" + SizeExprToString(size_);
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}
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for (auto* deco : decos_) {
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if (auto* stride = deco->As<ast::StrideDecoration>()) {
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type_name += "_stride_" + std::to_string(stride->stride());
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}
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}
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return type_name;
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}
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std::string Array::FriendlyName(const SymbolTable& symbols) const {
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std::ostringstream out;
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for (auto* deco : decos_) {
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if (auto* stride = deco->As<ast::StrideDecoration>()) {
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out << "[[stride(" << stride->stride() << ")]] ";
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}
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}
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out << "array<" << subtype_->FriendlyName(symbols);
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if (!IsRuntimeArray()) {
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out << ", " << SizeExprToString(size_, &symbols);
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}
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out << ">";
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return out.str();
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}
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Array* Array::Clone(CloneContext* ctx) const {
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// Clone arguments outside of create() call to have deterministic ordering
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auto src = ctx->Clone(source());
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auto* ty = ctx->Clone(type());
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auto* size = ctx->Clone(Size());
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auto decos = ctx->Clone(decorations());
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return ctx->dst->create<Array>(src, ty, size, decos);
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}
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} // namespace ast
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} // namespace tint
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