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
64