1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
//===--- RefactoringCallbacks.cpp - Structural query framework ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/RefactoringCallbacks.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Lex/Lexer.h"
using llvm::StringError;
using llvm::make_error;
namespace clang {
namespace tooling {
RefactoringCallback::RefactoringCallback() {}
tooling::Replacements &RefactoringCallback::getReplacements() {
return Replace;
}
ASTMatchRefactorer::ASTMatchRefactorer(
std::map<std::string, Replacements> &FileToReplaces)
: FileToReplaces(FileToReplaces) {}
void ASTMatchRefactorer::addDynamicMatcher(
const ast_matchers::internal::DynTypedMatcher &Matcher,
RefactoringCallback *Callback) {
MatchFinder.addDynamicMatcher(Matcher, Callback);
Callbacks.push_back(Callback);
}
class RefactoringASTConsumer : public ASTConsumer {
public:
explicit RefactoringASTConsumer(ASTMatchRefactorer &Refactoring)
: Refactoring(Refactoring) {}
void HandleTranslationUnit(ASTContext &Context) override {
// The ASTMatchRefactorer is re-used between translation units.
// Clear the matchers so that each Replacement is only emitted once.
for (const auto &Callback : Refactoring.Callbacks) {
Callback->getReplacements().clear();
}
Refactoring.MatchFinder.matchAST(Context);
for (const auto &Callback : Refactoring.Callbacks) {
for (const auto &Replacement : Callback->getReplacements()) {
llvm::Error Err =
Refactoring.FileToReplaces[Replacement.getFilePath()].add(
Replacement);
if (Err) {
llvm::errs() << "Skipping replacement " << Replacement.toString()
<< " due to this error:\n"
<< toString(std::move(Err)) << "\n";
}
}
}
}
private:
ASTMatchRefactorer &Refactoring;
};
std::unique_ptr<ASTConsumer> ASTMatchRefactorer::newASTConsumer() {
return llvm::make_unique<RefactoringASTConsumer>(*this);
}
static Replacement replaceStmtWithText(SourceManager &Sources, const Stmt &From,
StringRef Text) {
return tooling::Replacement(
Sources, CharSourceRange::getTokenRange(From.getSourceRange()), Text);
}
static Replacement replaceStmtWithStmt(SourceManager &Sources, const Stmt &From,
const Stmt &To) {
return replaceStmtWithText(
Sources, From,
Lexer::getSourceText(CharSourceRange::getTokenRange(To.getSourceRange()),
Sources, LangOptions()));
}
ReplaceStmtWithText::ReplaceStmtWithText(StringRef FromId, StringRef ToText)
: FromId(FromId), ToText(ToText) {}
void ReplaceStmtWithText::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (const Stmt *FromMatch = Result.Nodes.getNodeAs<Stmt>(FromId)) {
auto Err = Replace.add(tooling::Replacement(
*Result.SourceManager,
CharSourceRange::getTokenRange(FromMatch->getSourceRange()), ToText));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
ReplaceStmtWithStmt::ReplaceStmtWithStmt(StringRef FromId, StringRef ToId)
: FromId(FromId), ToId(ToId) {}
void ReplaceStmtWithStmt::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
const Stmt *FromMatch = Result.Nodes.getNodeAs<Stmt>(FromId);
const Stmt *ToMatch = Result.Nodes.getNodeAs<Stmt>(ToId);
if (FromMatch && ToMatch) {
auto Err = Replace.add(
replaceStmtWithStmt(*Result.SourceManager, *FromMatch, *ToMatch));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
ReplaceIfStmtWithItsBody::ReplaceIfStmtWithItsBody(StringRef Id,
bool PickTrueBranch)
: Id(Id), PickTrueBranch(PickTrueBranch) {}
void ReplaceIfStmtWithItsBody::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (const IfStmt *Node = Result.Nodes.getNodeAs<IfStmt>(Id)) {
const Stmt *Body = PickTrueBranch ? Node->getThen() : Node->getElse();
if (Body) {
auto Err =
Replace.add(replaceStmtWithStmt(*Result.SourceManager, *Node, *Body));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
} else if (!PickTrueBranch) {
// If we want to use the 'else'-branch, but it doesn't exist, delete
// the whole 'if'.
auto Err =
Replace.add(replaceStmtWithText(*Result.SourceManager, *Node, ""));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
}
ReplaceNodeWithTemplate::ReplaceNodeWithTemplate(
llvm::StringRef FromId, std::vector<TemplateElement> Template)
: FromId(FromId), Template(std::move(Template)) {}
llvm::Expected<std::unique_ptr<ReplaceNodeWithTemplate>>
ReplaceNodeWithTemplate::create(StringRef FromId, StringRef ToTemplate) {
std::vector<TemplateElement> ParsedTemplate;
for (size_t Index = 0; Index < ToTemplate.size();) {
if (ToTemplate[Index] == '$') {
if (ToTemplate.substr(Index, 2) == "$$") {
Index += 2;
ParsedTemplate.push_back(
TemplateElement{TemplateElement::Literal, "$"});
} else if (ToTemplate.substr(Index, 2) == "${") {
size_t EndOfIdentifier = ToTemplate.find("}", Index);
if (EndOfIdentifier == std::string::npos) {
return make_error<StringError>(
"Unterminated ${...} in replacement template near " +
ToTemplate.substr(Index),
llvm::inconvertibleErrorCode());
}
std::string SourceNodeName =
ToTemplate.substr(Index + 2, EndOfIdentifier - Index - 2);
ParsedTemplate.push_back(
TemplateElement{TemplateElement::Identifier, SourceNodeName});
Index = EndOfIdentifier + 1;
} else {
return make_error<StringError>(
"Invalid $ in replacement template near " +
ToTemplate.substr(Index),
llvm::inconvertibleErrorCode());
}
} else {
size_t NextIndex = ToTemplate.find('$', Index + 1);
ParsedTemplate.push_back(
TemplateElement{TemplateElement::Literal,
ToTemplate.substr(Index, NextIndex - Index)});
Index = NextIndex;
}
}
return std::unique_ptr<ReplaceNodeWithTemplate>(
new ReplaceNodeWithTemplate(FromId, std::move(ParsedTemplate)));
}
void ReplaceNodeWithTemplate::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
const auto &NodeMap = Result.Nodes.getMap();
std::string ToText;
for (const auto &Element : Template) {
switch (Element.Type) {
case TemplateElement::Literal:
ToText += Element.Value;
break;
case TemplateElement::Identifier: {
auto NodeIter = NodeMap.find(Element.Value);
if (NodeIter == NodeMap.end()) {
llvm::errs() << "Node " << Element.Value
<< " used in replacement template not bound in Matcher \n";
llvm::report_fatal_error("Unbound node in replacement template.");
}
CharSourceRange Source =
CharSourceRange::getTokenRange(NodeIter->second.getSourceRange());
ToText += Lexer::getSourceText(Source, *Result.SourceManager,
Result.Context->getLangOpts());
break;
}
}
}
if (NodeMap.count(FromId) == 0) {
llvm::errs() << "Node to be replaced " << FromId
<< " not bound in query.\n";
llvm::report_fatal_error("FromId node not bound in MatchResult");
}
auto Replacement =
tooling::Replacement(*Result.SourceManager, &NodeMap.at(FromId), ToText,
Result.Context->getLangOpts());
llvm::Error Err = Replace.add(Replacement);
if (Err) {
llvm::errs() << "Query and replace failed in " << Replacement.getFilePath()
<< "! " << llvm::toString(std::move(Err)) << "\n";
llvm::report_fatal_error("Replacement failed");
}
}
} // end namespace tooling
} // end namespace clang
|
