1 //==- ProgramPoint.cpp - Program Points for Path-Sensitive Analysis -*- C++ -*-/
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 file defines the interface ProgramPoint, which identifies a
10 // distinct location in a function.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Analysis/ProgramPoint.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/Basic/JsonSupport.h"
17
18 using namespace clang;
19
~ProgramPointTag()20 ProgramPointTag::~ProgramPointTag() {}
21
getProgramPoint(const Stmt * S,ProgramPoint::Kind K,const LocationContext * LC,const ProgramPointTag * tag)22 ProgramPoint ProgramPoint::getProgramPoint(const Stmt *S, ProgramPoint::Kind K,
23 const LocationContext *LC,
24 const ProgramPointTag *tag){
25 switch (K) {
26 default:
27 llvm_unreachable("Unhandled ProgramPoint kind");
28 case ProgramPoint::PreStmtKind:
29 return PreStmt(S, LC, tag);
30 case ProgramPoint::PostStmtKind:
31 return PostStmt(S, LC, tag);
32 case ProgramPoint::PreLoadKind:
33 return PreLoad(S, LC, tag);
34 case ProgramPoint::PostLoadKind:
35 return PostLoad(S, LC, tag);
36 case ProgramPoint::PreStoreKind:
37 return PreStore(S, LC, tag);
38 case ProgramPoint::PostLValueKind:
39 return PostLValue(S, LC, tag);
40 case ProgramPoint::PostStmtPurgeDeadSymbolsKind:
41 return PostStmtPurgeDeadSymbols(S, LC, tag);
42 case ProgramPoint::PreStmtPurgeDeadSymbolsKind:
43 return PreStmtPurgeDeadSymbols(S, LC, tag);
44 }
45 }
46
dump() const47 LLVM_DUMP_METHOD void ProgramPoint::dump() const {
48 return printJson(llvm::errs());
49 }
50
printJson(llvm::raw_ostream & Out,const char * NL) const51 void ProgramPoint::printJson(llvm::raw_ostream &Out, const char *NL) const {
52 const ASTContext &Context =
53 getLocationContext()->getAnalysisDeclContext()->getASTContext();
54 const SourceManager &SM = Context.getSourceManager();
55 const PrintingPolicy &PP = Context.getPrintingPolicy();
56 const bool AddQuotes = true;
57
58 Out << "\"kind\": \"";
59 switch (getKind()) {
60 case ProgramPoint::BlockEntranceKind:
61 Out << "BlockEntrance\""
62 << ", \"block_id\": "
63 << castAs<BlockEntrance>().getBlock()->getBlockID();
64 break;
65
66 case ProgramPoint::FunctionExitKind: {
67 auto FEP = getAs<FunctionExitPoint>();
68 Out << "FunctionExit\""
69 << ", \"block_id\": " << FEP->getBlock()->getBlockID()
70 << ", \"stmt_id\": ";
71
72 if (const ReturnStmt *RS = FEP->getStmt()) {
73 Out << RS->getID(Context) << ", \"stmt\": ";
74 RS->printJson(Out, nullptr, PP, AddQuotes);
75 } else {
76 Out << "null, \"stmt\": null";
77 }
78 break;
79 }
80 case ProgramPoint::BlockExitKind:
81 llvm_unreachable("BlockExitKind");
82 break;
83 case ProgramPoint::CallEnterKind:
84 Out << "CallEnter\"";
85 break;
86 case ProgramPoint::CallExitBeginKind:
87 Out << "CallExitBegin\"";
88 break;
89 case ProgramPoint::CallExitEndKind:
90 Out << "CallExitEnd\"";
91 break;
92 case ProgramPoint::EpsilonKind:
93 Out << "EpsilonPoint\"";
94 break;
95
96 case ProgramPoint::LoopExitKind:
97 Out << "LoopExit\", \"stmt\": \""
98 << castAs<LoopExit>().getLoopStmt()->getStmtClassName() << '\"';
99 break;
100
101 case ProgramPoint::PreImplicitCallKind: {
102 ImplicitCallPoint PC = castAs<ImplicitCallPoint>();
103 Out << "PreCall\", \"decl\": \""
104 << PC.getDecl()->getAsFunction()->getQualifiedNameAsString()
105 << "\", \"location\": ";
106 printSourceLocationAsJson(Out, PC.getLocation(), SM);
107 break;
108 }
109
110 case ProgramPoint::PostImplicitCallKind: {
111 ImplicitCallPoint PC = castAs<ImplicitCallPoint>();
112 Out << "PostCall\", \"decl\": \""
113 << PC.getDecl()->getAsFunction()->getQualifiedNameAsString()
114 << "\", \"location\": ";
115 printSourceLocationAsJson(Out, PC.getLocation(), SM);
116 break;
117 }
118
119 case ProgramPoint::PostInitializerKind: {
120 Out << "PostInitializer\", ";
121 const CXXCtorInitializer *Init = castAs<PostInitializer>().getInitializer();
122 if (const FieldDecl *FD = Init->getAnyMember()) {
123 Out << "\"field_decl\": \"" << *FD << '\"';
124 } else {
125 Out << "\"type\": \"";
126 QualType Ty = Init->getTypeSourceInfo()->getType();
127 Ty = Ty.getLocalUnqualifiedType();
128 Ty.print(Out, Context.getLangOpts());
129 Out << '\"';
130 }
131 break;
132 }
133
134 case ProgramPoint::BlockEdgeKind: {
135 const BlockEdge &E = castAs<BlockEdge>();
136 const Stmt *T = E.getSrc()->getTerminatorStmt();
137 Out << "Edge\", \"src_id\": " << E.getSrc()->getBlockID()
138 << ", \"dst_id\": " << E.getDst()->getBlockID() << ", \"terminator\": ";
139
140 if (!T) {
141 Out << "null, \"term_kind\": null";
142 break;
143 }
144
145 E.getSrc()->printTerminatorJson(Out, Context.getLangOpts(),
146 /*AddQuotes=*/true);
147 Out << ", \"location\": ";
148 printSourceLocationAsJson(Out, T->getBeginLoc(), SM);
149
150 Out << ", \"term_kind\": \"";
151 if (isa<SwitchStmt>(T)) {
152 Out << "SwitchStmt\", \"case\": ";
153 if (const Stmt *Label = E.getDst()->getLabel()) {
154 if (const auto *C = dyn_cast<CaseStmt>(Label)) {
155 Out << "{ \"lhs\": ";
156 if (const Stmt *LHS = C->getLHS()) {
157 LHS->printJson(Out, nullptr, PP, AddQuotes);
158 } else {
159 Out << "null";
160 }
161
162 Out << ", \"rhs\": ";
163 if (const Stmt *RHS = C->getRHS()) {
164 RHS->printJson(Out, nullptr, PP, AddQuotes);
165 } else {
166 Out << "null";
167 }
168 Out << " }";
169 } else {
170 assert(isa<DefaultStmt>(Label));
171 Out << "\"default\"";
172 }
173 } else {
174 Out << "\"implicit default\"";
175 }
176 } else if (isa<IndirectGotoStmt>(T)) {
177 // FIXME: More info.
178 Out << "IndirectGotoStmt\"";
179 } else {
180 Out << "Condition\", \"value\": "
181 << (*E.getSrc()->succ_begin() == E.getDst() ? "true" : "false");
182 }
183 break;
184 }
185
186 default: {
187 const Stmt *S = castAs<StmtPoint>().getStmt();
188 assert(S != nullptr && "Expecting non-null Stmt");
189
190 Out << "Statement\", \"stmt_kind\": \"" << S->getStmtClassName()
191 << "\", \"stmt_id\": " << S->getID(Context)
192 << ", \"pointer\": \"" << (const void *)S << "\", ";
193 if (const auto *CS = dyn_cast<CastExpr>(S))
194 Out << "\"cast_kind\": \"" << CS->getCastKindName() << "\", ";
195
196 Out << "\"pretty\": ";
197
198 S->printJson(Out, nullptr, PP, AddQuotes);
199
200 Out << ", \"location\": ";
201 printSourceLocationAsJson(Out, S->getBeginLoc(), SM);
202
203 Out << ", \"stmt_point_kind\": \"";
204 if (getAs<PreLoad>())
205 Out << "PreLoad";
206 else if (getAs<PreStore>())
207 Out << "PreStore";
208 else if (getAs<PostAllocatorCall>())
209 Out << "PostAllocatorCall";
210 else if (getAs<PostCondition>())
211 Out << "PostCondition";
212 else if (getAs<PostLoad>())
213 Out << "PostLoad";
214 else if (getAs<PostLValue>())
215 Out << "PostLValue";
216 else if (getAs<PostStore>())
217 Out << "PostStore";
218 else if (getAs<PostStmt>())
219 Out << "PostStmt";
220 else if (getAs<PostStmtPurgeDeadSymbols>())
221 Out << "PostStmtPurgeDeadSymbols";
222 else if (getAs<PreStmtPurgeDeadSymbols>())
223 Out << "PreStmtPurgeDeadSymbols";
224 else if (getAs<PreStmt>())
225 Out << "PreStmt";
226 else {
227 Out << "\nKind: '" << getKind();
228 llvm_unreachable("' is unhandled StmtPoint kind!");
229 }
230
231 Out << '\"';
232 break;
233 }
234 }
235 }
236
SimpleProgramPointTag(StringRef MsgProvider,StringRef Msg)237 SimpleProgramPointTag::SimpleProgramPointTag(StringRef MsgProvider,
238 StringRef Msg)
239 : Desc((MsgProvider + " : " + Msg).str()) {}
240
getTagDescription() const241 StringRef SimpleProgramPointTag::getTagDescription() const {
242 return Desc;
243 }
244