1 //===---- Query.cpp - clang-query query -----------------------------------===//
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 "Query.h"
11 #include "QuerySession.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 #include "clang/Frontend/ASTUnit.h"
14 #include "clang/Frontend/TextDiagnostic.h"
15 #include "llvm/Support/raw_ostream.h"
16 
17 using namespace clang::ast_matchers;
18 using namespace clang::ast_matchers::dynamic;
19 
20 namespace clang {
21 namespace query {
22 
23 Query::~Query() {}
24 
25 bool InvalidQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
26   OS << ErrStr << "\n";
27   return false;
28 }
29 
30 bool NoOpQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
31   return true;
32 }
33 
34 bool HelpQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
35   OS << "Available commands:\n\n"
36         "  match MATCHER, m MATCHER          "
37         "Match the loaded ASTs against the given matcher.\n"
38         "  let NAME MATCHER, l NAME MATCHER  "
39         "Give a matcher expression a name, to be used later\n"
40         "                                    "
41         "as part of other expressions.\n"
42         "  set bind-root (true|false)        "
43         "Set whether to bind the root matcher to \"root\".\n"
44         "  set output (diag|print|dump)      "
45         "Set whether to print bindings as diagnostics,\n"
46         "                                    "
47         "AST pretty prints or AST dumps.\n"
48         "  quit                              "
49         "Terminates the query session.\n\n";
50   return true;
51 }
52 
53 bool QuitQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
54   QS.Terminate = true;
55   return true;
56 }
57 
58 namespace {
59 
60 struct CollectBoundNodes : MatchFinder::MatchCallback {
61   std::vector<BoundNodes> &Bindings;
62   CollectBoundNodes(std::vector<BoundNodes> &Bindings) : Bindings(Bindings) {}
63   void run(const MatchFinder::MatchResult &Result) override {
64     Bindings.push_back(Result.Nodes);
65   }
66 };
67 
68 }  // namespace
69 
70 bool MatchQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
71   unsigned MatchCount = 0;
72 
73   for (auto &AST : QS.ASTs) {
74     MatchFinder Finder;
75     std::vector<BoundNodes> Matches;
76     DynTypedMatcher MaybeBoundMatcher = Matcher;
77     if (QS.BindRoot) {
78       llvm::Optional<DynTypedMatcher> M = Matcher.tryBind("root");
79       if (M)
80         MaybeBoundMatcher = *M;
81     }
82     CollectBoundNodes Collect(Matches);
83     if (!Finder.addDynamicMatcher(MaybeBoundMatcher, &Collect)) {
84       OS << "Not a valid top-level matcher.\n";
85       return false;
86     }
87     Finder.matchAST(AST->getASTContext());
88 
89     for (std::vector<BoundNodes>::iterator MI = Matches.begin(),
90                                            ME = Matches.end();
91          MI != ME; ++MI) {
92       OS << "\nMatch #" << ++MatchCount << ":\n\n";
93 
94       for (BoundNodes::IDToNodeMap::const_iterator BI = MI->getMap().begin(),
95                                                    BE = MI->getMap().end();
96            BI != BE; ++BI) {
97         switch (QS.OutKind) {
98         case OK_Diag: {
99           clang::SourceRange R = BI->second.getSourceRange();
100           if (R.isValid()) {
101             TextDiagnostic TD(OS, AST->getASTContext().getLangOpts(),
102                               &AST->getDiagnostics().getDiagnosticOptions());
103             TD.emitDiagnostic(
104                 R.getBegin(), DiagnosticsEngine::Note,
105                 "\"" + BI->first + "\" binds here",
106                 CharSourceRange::getTokenRange(R),
107                 None, &AST->getSourceManager());
108           }
109           break;
110         }
111         case OK_Print: {
112           OS << "Binding for \"" << BI->first << "\":\n";
113           BI->second.print(OS, AST->getASTContext().getPrintingPolicy());
114           OS << "\n";
115           break;
116         }
117         case OK_Dump: {
118           OS << "Binding for \"" << BI->first << "\":\n";
119           BI->second.dump(OS, AST->getSourceManager());
120           OS << "\n";
121           break;
122         }
123         }
124       }
125 
126       if (MI->getMap().empty())
127         OS << "No bindings.\n";
128     }
129   }
130 
131   OS << MatchCount << (MatchCount == 1 ? " match.\n" : " matches.\n");
132   return true;
133 }
134 
135 bool LetQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
136   if (Value) {
137     QS.NamedValues[Name] = Value;
138   } else {
139     QS.NamedValues.erase(Name);
140   }
141   return true;
142 }
143 
144 #ifndef _MSC_VER
145 const QueryKind SetQueryKind<bool>::value;
146 const QueryKind SetQueryKind<OutputKind>::value;
147 #endif
148 
149 } // namespace query
150 } // namespace clang
151