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