clang/unittests/AST/ASTExprTest.cpp

   1 //===- unittests/AST/ASTExprTest.cpp --- AST Expr tests -------------------===//
   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 //
   9 // This file contains tests for AST Expr related methods.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ASTPrint.h"
  14 #include "clang/AST/ASTContext.h"
  15 #include "clang/AST/Expr.h"
  16 #include "clang/AST/IgnoreExpr.h"
  17 #include "clang/ASTMatchers/ASTMatchFinder.h"
  18 #include "clang/Tooling/Tooling.h"
  19 #include "gtest/gtest.h"
  20
  21 using namespace clang;
  22
  23 TEST(ASTExpr, IgnoreExprCallbackForwarded) {
  24   constexpr char Code[] = "";
  25   auto AST = tooling::buildASTFromCodeWithArgs(Code, /*Args=*/{"-std=c++20"});
  26   ASTContext &Ctx = AST->getASTContext();
  27
  28   auto createIntLiteral = [&](uint32_t Value) -> IntegerLiteral * {
  29     const int numBits = 32;
  30     return IntegerLiteral::Create(Ctx, llvm::APInt(numBits, Value),
  31                                   Ctx.UnsignedIntTy, {});
  32   };
  33
  34   struct IgnoreParens {
  35     Expr *operator()(Expr *E) & { return nullptr; }
  36     Expr *operator()(Expr *E) && {
  37       if (auto *PE = dyn_cast<ParenExpr>(E)) {
  38         return PE->getSubExpr();
  39       }
  40       return E;
  41     }
  42   };
  43
  44   {
  45     auto *IntExpr = createIntLiteral(10);
  46     ParenExpr *PE =
  47         new (Ctx) ParenExpr(SourceLocation{}, SourceLocation{}, IntExpr);
  48     EXPECT_EQ(IntExpr, IgnoreExprNodes(PE, IgnoreParens{}));
  49   }
  50
  51   {
  52     IgnoreParens CB{};
  53     auto *IntExpr = createIntLiteral(10);
  54     ParenExpr *PE =
  55         new (Ctx) ParenExpr(SourceLocation{}, SourceLocation{}, IntExpr);
  56     EXPECT_EQ(nullptr, IgnoreExprNodes(PE, CB));
  57   }
  58 }