110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
// Copyright 2021 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 FUZZERS_TINT_AST_FUZZER_UTIL_H_
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#define FUZZERS_TINT_AST_FUZZER_UTIL_H_
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#include <vector>
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#include "src/ast/module.h"
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#include "src/ast/variable_decl_statement.h"
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#include "src/castable.h"
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#include "src/program.h"
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#include "src/sem/block_statement.h"
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#include "src/sem/statement.h"
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#include "src/sem/variable.h"
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namespace tint {
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namespace fuzzers {
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namespace ast_fuzzer {
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namespace util {
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/// @file
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/// @brief Returns all in-scope variables (including formal function parameters)
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/// related to statement `curr_stmt`.
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///
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/// These variables are additionally filtered by applying a predicate `pred`.
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///
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/// @tparam Pred - a predicate that accepts a `const sem::Variable*` and returns
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/// `bool`.
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/// @param program - the program to look for variables in.
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/// @param curr_stmt - the current statement. Everything below it is not in
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/// scope.
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/// @param pred - a predicate (e.g. a function pointer, functor, lambda etc) of
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/// type `Pred`.
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/// @return a vector of all variables that can be accessed from `curr_stmt`.
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template <typename Pred>
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std::vector<const sem::Variable*> GetAllVarsInScope(
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const tint::Program& program,
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const sem::Statement* curr_stmt,
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Pred&& pred) {
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std::vector<const sem::Variable*> result;
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// Walk up the hierarchy of blocks in which `curr_stmt` is contained.
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for (const auto* block = curr_stmt->Block(); block;
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block = tint::As<sem::BlockStatement>(block->Parent())) {
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for (const auto* stmt : block->Declaration()->statements) {
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if (stmt == curr_stmt->Declaration()) {
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// `curr_stmt` was found. This is only possible if `block is the
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// enclosing block of `curr_stmt` since the AST nodes are not shared.
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// Because of all this, skip the iteration of the inner loop since
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// the rest of the instructions in the `block` are not visible from the
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// `curr_stmt`.
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break;
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}
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if (const auto* var_node = tint::As<ast::VariableDeclStatement>(stmt)) {
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const auto* sem_var = program.Sem().Get(var_node->variable);
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if (pred(sem_var)) {
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result.push_back(sem_var);
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}
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}
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}
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}
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// Process function parameters.
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for (const auto* param : curr_stmt->Function()->params) {
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const auto* sem_var = program.Sem().Get(param);
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if (pred(sem_var)) {
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result.push_back(sem_var);
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}
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}
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// Global variables do not belong to any ast::BlockStatement.
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for (const auto* global_decl : program.AST().GlobalDeclarations()) {
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if (global_decl == curr_stmt->Function()) {
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// The same situation as in the previous loop. The current function has
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// been reached. If there are any variables declared below, they won't be
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// visible in this function. Thus, exit the loop.
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break;
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}
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if (const auto* global_var = tint::As<ast::Variable>(global_decl)) {
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const auto* sem_node = program.Sem().Get(global_var);
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if (pred(sem_node)) {
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result.push_back(sem_node);
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}
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}
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}
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return result;
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}
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} // namespace util
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} // namespace ast_fuzzer
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} // namespace fuzzers
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} // namespace tint
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#endif // FUZZERS_TINT_AST_FUZZER_UTIL_H_
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