1 //===- unittests/AST/StmtPrinterTest.cpp --- Statement printer tests ------===//
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 // This file contains tests for Stmt::printPretty() and related methods.
11 //
12 // Search this file for WRONG to see test cases that are producing something
13 // completely wrong, invalid C++ or just misleading.
14 //
15 // These tests have a coding convention:
16 // * statements to be printed should be contained within a function named 'A'
17 //   unless it should have some special name (e.g., 'operator+');
18 // * additional helper declarations are 'Z', 'Y', 'X' and so on.
19 //
20 //===----------------------------------------------------------------------===//
21 
22 #include "clang/AST/ASTContext.h"
23 #include "clang/ASTMatchers/ASTMatchFinder.h"
24 #include "clang/Tooling/Tooling.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "gtest/gtest.h"
27 
28 using namespace clang;
29 using namespace ast_matchers;
30 using namespace tooling;
31 
32 namespace {
33 
34 void PrintStmt(raw_ostream &Out, const ASTContext *Context, const Stmt *S) {
35   PrintingPolicy Policy = Context->getPrintingPolicy();
36   S->printPretty(Out, /*Helper*/ 0, Policy);
37 }
38 
39 class PrintMatch : public MatchFinder::MatchCallback {
40   SmallString<1024> Printed;
41   unsigned NumFoundStmts;
42 
43 public:
44   PrintMatch() : NumFoundStmts(0) {}
45 
46   virtual void run(const MatchFinder::MatchResult &Result) {
47     const Stmt *S = Result.Nodes.getStmtAs<Stmt>("id");
48     if (!S)
49       return;
50     NumFoundStmts++;
51     if (NumFoundStmts > 1)
52       return;
53 
54     llvm::raw_svector_ostream Out(Printed);
55     PrintStmt(Out, Result.Context, S);
56   }
57 
58   StringRef getPrinted() const {
59     return Printed;
60   }
61 
62   unsigned getNumFoundStmts() const {
63     return NumFoundStmts;
64   }
65 };
66 
67 ::testing::AssertionResult PrintedStmtMatches(
68                                         StringRef Code,
69                                         const std::vector<std::string> &Args,
70                                         const DeclarationMatcher &NodeMatch,
71                                         StringRef ExpectedPrinted) {
72 
73   PrintMatch Printer;
74   MatchFinder Finder;
75   Finder.addMatcher(NodeMatch, &Printer);
76   OwningPtr<FrontendActionFactory> Factory(newFrontendActionFactory(&Finder));
77 
78   if (!runToolOnCodeWithArgs(Factory->create(), Code, Args))
79     return testing::AssertionFailure()
80       << "Parsing error in \"" << Code.str() << "\"";
81 
82   if (Printer.getNumFoundStmts() == 0)
83     return testing::AssertionFailure()
84         << "Matcher didn't find any statements";
85 
86   if (Printer.getNumFoundStmts() > 1)
87     return testing::AssertionFailure()
88         << "Matcher should match only one statement "
89            "(found " << Printer.getNumFoundStmts() << ")";
90 
91   if (Printer.getPrinted() != ExpectedPrinted)
92     return ::testing::AssertionFailure()
93       << "Expected \"" << ExpectedPrinted.str() << "\", "
94          "got \"" << Printer.getPrinted().str() << "\"";
95 
96   return ::testing::AssertionSuccess();
97 }
98 
99 ::testing::AssertionResult PrintedStmtCXX98Matches(
100                                               StringRef Code,
101                                               StringRef ContainingFunction,
102                                               StringRef ExpectedPrinted) {
103   std::vector<std::string> Args;
104   Args.push_back("-std=c++98");
105   Args.push_back("-Wno-unused-value");
106   return PrintedStmtMatches(Code,
107                             Args,
108                             functionDecl(hasName(ContainingFunction),
109                                          has(compoundStmt(has(stmt().bind("id"))))),
110                             ExpectedPrinted);
111 }
112 
113 ::testing::AssertionResult PrintedStmtMSMatches(
114                                               StringRef Code,
115                                               StringRef ContainingFunction,
116                                               StringRef ExpectedPrinted) {
117   std::vector<std::string> Args;
118   Args.push_back("-std=c++98");
119   Args.push_back("-fms-extensions");
120   Args.push_back("-Wno-unused-value");
121   return PrintedStmtMatches(Code,
122                             Args,
123                             functionDecl(hasName(ContainingFunction),
124                                          has(compoundStmt(has(stmt().bind("id"))))),
125                             ExpectedPrinted);
126 }
127 
128 } // unnamed namespace
129 
130 TEST(StmtPrinter, TestIntegerLiteral) {
131   ASSERT_TRUE(PrintedStmtCXX98Matches(
132     "void A() {"
133     "  1, -1, 1U, 1u,"
134     "  1L, 1l, -1L, 1UL, 1ul,"
135     "  1LL, -1LL, 1ULL;"
136     "}",
137     "A",
138     "1 , -1 , 1U , 1U , "
139     "1L , 1L , -1L , 1UL , 1UL , "
140     "1LL , -1LL , 1ULL"));
141     // Should be: with semicolon
142 }
143 
144 TEST(StmtPrinter, TestMSIntegerLiteral) {
145   ASSERT_TRUE(PrintedStmtMSMatches(
146     "void A() {"
147     "  1i8, -1i8, 1ui8, "
148     "  1i16, -1i16, 1ui16, "
149     "  1i32, -1i32, 1ui32, "
150     "  1i64, -1i64, 1ui64;"
151     "}",
152     "A",
153     "1 , -1 , 1U , "
154     "1 , -1 , 1U , "
155     "1L , -1L , 1UL , "
156     "1LL , -1LL , 1ULL"));
157     // Should be: with semicolon
158 }
159 
160 TEST(StmtPrinter, TestFloatingPointLiteral) {
161   ASSERT_TRUE(PrintedStmtCXX98Matches(
162     "void A() { 1.0f, -1.0f, 1.0, -1.0, 1.0l, -1.0l; }",
163     "A",
164     "1.F , -1.F , 1. , -1. , 1.L , -1.L"));
165     // Should be: with semicolon
166 }
167