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// 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/fuzzers/tint_ast_fuzzer/expression_size.h"
#include "src/tint/lang/wgsl/ast/traverse_expressions.h"
namespace tint::fuzzers::ast_fuzzer {
ExpressionSize::ExpressionSize(const Program& program) {
// By construction, all the children of an AST node are encountered before the
// node itself when iterating through a program's AST nodes. Computing
// expression sizes exploits this property: the size of a compound expression
// is computed based on the already-computed sizes of its sub-expressions.
for (const auto* node : program.ASTNodes().Objects()) {
const auto* expr_ast_node = node->As<ast::Expression>();
if (expr_ast_node == nullptr) {
continue;
}
size_t expr_size = 0;
ast::TraverseExpressions(expr_ast_node, [&](const ast::Expression* expression) {
if (expression == expr_ast_node) {
expr_size++;
return ast::TraverseAction::Descend;
}
expr_size += expr_to_size_.at(expression);
return ast::TraverseAction::Skip;
});
expr_to_size_[expr_ast_node] = expr_size;
}
}
} // namespace tint::fuzzers::ast_fuzzer