1//===---- ClangQuery.cpp - clang-query tool -------------------------------===//
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 tool is for interactive exploration of the Clang AST using AST matchers.
10// It currently allows the user to enter a matcher at an interactive prompt and
11// view the resulting bindings as diagnostics, AST pretty prints or AST dumps.
12// Example session:
13//
14// $ cat foo.c
15// void foo(void) {}
16// $ clang-query foo.c --
17// clang-query> match functionDecl()
18//
19// Match #1:
20//
21// foo.c:1:1: note: "root" binds here
22// void foo(void) {}
23// ^~~~~~~~~~~~~~~~~
24// 1 match.
25//
26//===----------------------------------------------------------------------===//
27
28#include "Query.h"
29#include "QueryParser.h"
30#include "QuerySession.h"
31#include "clang/Frontend/ASTUnit.h"
32#include "clang/Tooling/CommonOptionsParser.h"
33#include "clang/Tooling/Tooling.h"
34#include "llvm/LineEditor/LineEditor.h"
35#include "llvm/Support/CommandLine.h"
36#include "llvm/Support/Error.h"
37#include "llvm/Support/MemoryBuffer.h"
38#include "llvm/Support/Signals.h"
39#include "llvm/Support/WithColor.h"
40#include <optional>
41#include <string>
42
43using namespace clang;
44using namespace clang::ast_matchers;
45using namespace clang::ast_matchers::dynamic;
46using namespace clang::query;
47using namespace clang::tooling;
48using namespace llvm;
49
50static cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage);
51static cl::OptionCategory ClangQueryCategory("clang-query options");
52
53static cl::opt<bool>
54 UseColor("use-color",
55 cl::desc(
56 R"(Use colors in detailed AST output. If not set, colors
57will be used if the terminal connected to
58standard output supports colors.)"),
59 cl::init(Val: false), cl::cat(ClangQueryCategory));
60
61static cl::list<std::string> Commands("c", cl::desc("Specify command to run"),
62 cl::value_desc("command"),
63 cl::cat(ClangQueryCategory));
64
65static cl::list<std::string> CommandFiles("f",
66 cl::desc("Read commands from file"),
67 cl::value_desc("file"),
68 cl::cat(ClangQueryCategory));
69
70static cl::opt<std::string> PreloadFile(
71 "preload",
72 cl::desc("Preload commands from file and start interactive mode"),
73 cl::value_desc("file"), cl::cat(ClangQueryCategory));
74
75bool runCommandsInFile(const char *ExeName, std::string const &FileName,
76 QuerySession &QS) {
77 FileQuery Query(FileName, ExeName);
78 return !Query.run(OS&: llvm::errs(), QS);
79}
80
81int main(int argc, const char **argv) {
82 llvm::sys::PrintStackTraceOnErrorSignal(Argv0: argv[0]);
83
84 llvm::Expected<CommonOptionsParser> OptionsParser =
85 CommonOptionsParser::create(argc, argv, Category&: ClangQueryCategory,
86 OccurrencesFlag: llvm::cl::OneOrMore);
87
88 if (!OptionsParser) {
89 llvm::WithColor::error() << llvm::toString(E: OptionsParser.takeError());
90 return 1;
91 }
92
93 if (!Commands.empty() && !CommandFiles.empty()) {
94 llvm::errs() << argv[0] << ": cannot specify both -c and -f\n";
95 return 1;
96 }
97
98 if ((!Commands.empty() || !CommandFiles.empty()) && !PreloadFile.empty()) {
99 llvm::errs() << argv[0]
100 << ": cannot specify both -c or -f with --preload\n";
101 return 1;
102 }
103
104 ClangTool Tool(OptionsParser->getCompilations(),
105 OptionsParser->getSourcePathList());
106
107 if (UseColor.getNumOccurrences() > 0) {
108 ArgumentsAdjuster colorAdjustor = [](const CommandLineArguments &Args, StringRef /*unused*/) {
109 CommandLineArguments AdjustedArgs = Args;
110 if (UseColor)
111 AdjustedArgs.push_back(x: "-fdiagnostics-color");
112 else
113 AdjustedArgs.push_back(x: "-fno-diagnostics-color");
114 return AdjustedArgs;
115 };
116 Tool.appendArgumentsAdjuster(Adjuster: colorAdjustor);
117 }
118
119 std::vector<std::unique_ptr<ASTUnit>> ASTs;
120 int ASTStatus = 0;
121 switch (Tool.buildASTs(ASTs)) {
122 case 0:
123 break;
124 case 1: // Building ASTs failed.
125 return 1;
126 case 2:
127 ASTStatus |= 1;
128 llvm::errs() << "Failed to build AST for some of the files, "
129 << "results may be incomplete."
130 << "\n";
131 break;
132 default:
133 llvm_unreachable("Unexpected status returned");
134 }
135
136 QuerySession QS(ASTs);
137
138 if (!Commands.empty()) {
139 for (auto &Command : Commands) {
140 QueryRef Q = QueryParser::parse(Line: Command, QS);
141 if (!Q->run(OS&: llvm::outs(), QS))
142 return 1;
143 }
144 } else if (!CommandFiles.empty()) {
145 for (auto &CommandFile : CommandFiles) {
146 if (runCommandsInFile(ExeName: argv[0], FileName: CommandFile, QS))
147 return 1;
148 }
149 } else {
150 if (!PreloadFile.empty()) {
151 if (runCommandsInFile(ExeName: argv[0], FileName: PreloadFile, QS))
152 return 1;
153 }
154 LineEditor LE("clang-query");
155 LE.setListCompleter([&QS](StringRef Line, size_t Pos) {
156 return QueryParser::complete(Line, Pos, QS);
157 });
158 while (std::optional<std::string> Line = LE.readLine()) {
159 QueryRef Q = QueryParser::parse(Line: *Line, QS);
160 Q->run(OS&: llvm::outs(), QS);
161 llvm::outs().flush();
162 if (QS.Terminate)
163 break;
164 }
165 }
166
167 return ASTStatus;
168}
169

source code of clang-tools-extra/clang-query/tool/ClangQuery.cpp