1//===- Synthesis.cpp ------------------------------------------*- C++ -*-=====//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8#include "clang/Tooling/Syntax/BuildTree.h"
9
10using namespace clang;
11
12/// Exposes private syntax tree APIs required to implement node synthesis.
13/// Should not be used for anything else.
14class syntax::FactoryImpl {
15public:
16  static void setCanModify(syntax::Node *N) { N->CanModify = true; }
17
18  static void prependChildLowLevel(syntax::Tree *T, syntax::Node *Child,
19                                   syntax::NodeRole R) {
20    T->prependChildLowLevel(Child, R);
21  }
22};
23
24clang::syntax::Leaf *syntax::createPunctuation(clang::syntax::Arena &A,
25                                               clang::tok::TokenKind K) {
26  auto Tokens = A.lexBuffer(llvm::MemoryBuffer::getMemBuffer(
27                                clang::tok::getPunctuatorSpelling(K)))
28                    .second;
29  assert(Tokens.size() == 1);
30  assert(Tokens.front().kind() == K);
31  auto *L = new (A.allocator()) clang::syntax::Leaf(Tokens.begin());
32  FactoryImpl::setCanModify(L);
33  L->assertInvariants();
34  return L;
35}
36
37clang::syntax::EmptyStatement *
38syntax::createEmptyStatement(clang::syntax::Arena &A) {
39  auto *S = new (A.allocator()) clang::syntax::EmptyStatement;
40  FactoryImpl::setCanModify(S);
41  FactoryImpl::prependChildLowLevel(S, createPunctuation(A, clang::tok::semi),
42                                    NodeRole::Unknown);
43  S->assertInvariants();
44  return S;
45}
46