unittests/Tooling/RecursiveASTVisitorTests/LambdaExpr.cpp

   1 //===- unittest/Tooling/RecursiveASTVisitorTests/LambdaExpr.cpp -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "TestVisitor.h"
  11 #include <stack>
  12
  13 using namespace clang;
  14
  15 namespace {
  16
  17 class LambdaExprVisitor : public ExpectedLocationVisitor<LambdaExprVisitor> {
  18 public:
  19   bool VisitLambdaExpr(LambdaExpr *Lambda) {
  20     PendingBodies.push(Lambda);
  21     Match("", Lambda->getIntroducerRange().getBegin());
  22     return true;
  23   }
  24   /// For each call to VisitLambdaExpr, we expect a subsequent call (with
  25   /// proper nesting) to TraverseLambdaBody.
  26   bool TraverseLambdaBody(LambdaExpr *Lambda) {
  27     EXPECT_FALSE(PendingBodies.empty());
  28     EXPECT_EQ(PendingBodies.top(), Lambda);
  29     PendingBodies.pop();
  30     return TraverseStmt(Lambda->getBody());
  31   }
  32   /// Determine whether TraverseLambdaBody has been called for every call to
  33   /// VisitLambdaExpr.
  34   bool allBodiesHaveBeenTraversed() const {
  35     return PendingBodies.empty();
  36   }
  37 private:
  38   std::stack<LambdaExpr *> PendingBodies;
  39 };
  40
  41 TEST(RecursiveASTVisitor, VisitsLambdaExpr) {
  42   LambdaExprVisitor Visitor;
  43   Visitor.ExpectMatch("", 1, 12);
  44   EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
  45                               LambdaExprVisitor::Lang_CXX11));
  46 }
  47
  48 TEST(RecursiveASTVisitor, TraverseLambdaBodyCanBeOverridden) {
  49   LambdaExprVisitor Visitor;
  50   EXPECT_TRUE(Visitor.runOver("void f() { []{ return; }(); }",
  51                               LambdaExprVisitor::Lang_CXX11));
  52   EXPECT_TRUE(Visitor.allBodiesHaveBeenTraversed());
  53 }
  54
  55 TEST(RecursiveASTVisitor, VisitsAttributedLambdaExpr) {
  56   LambdaExprVisitor Visitor;
  57   Visitor.ExpectMatch("", 1, 12);
  58   EXPECT_TRUE(Visitor.runOver(
  59       "void f() { [] () __attribute__ (( fastcall )) { return; }(); }",
  60       LambdaExprVisitor::Lang_CXX14));
  61 }
  62
  63 } // end anonymous namespace