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
|
//===- unittests/StaticAnalyzer/SymbolReaperTest.cpp ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/CrossTU/CrossTranslationUnit.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
#include "clang/StaticAnalyzer/Frontend/AnalysisConsumer.h"
#include "clang/Tooling/Tooling.h"
#include "gtest/gtest.h"
namespace clang {
namespace ento {
namespace {
using namespace ast_matchers;
// A re-usable consumer that constructs ExprEngine out of CompilerInvocation.
// TODO: Actually re-use it when we write our second test.
class ExprEngineConsumer : public ASTConsumer {
protected:
CompilerInstance &C;
private:
// We need to construct all of these in order to construct ExprEngine.
CheckerManager ChkMgr;
cross_tu::CrossTranslationUnitContext CTU;
PathDiagnosticConsumers Consumers;
AnalysisManager AMgr;
SetOfConstDecls VisitedCallees;
FunctionSummariesTy FS;
protected:
ExprEngine Eng;
// Find a declaration in the current AST by name. This has nothing to do
// with ExprEngine but turns out to be handy.
// TODO: There's probably a better place for it.
template <typename T>
const T *findDeclByName(const Decl *Where, StringRef Name) {
auto Matcher = decl(hasDescendant(namedDecl(hasName(Name)).bind("d")));
auto Matches = match(Matcher, *Where, Eng.getContext());
assert(Matches.size() == 1 && "Ambiguous name!");
const T *Node = selectFirst<T>("d", Matches);
assert(Node && "Name not found!");
return Node;
}
public:
ExprEngineConsumer(CompilerInstance &C)
: C(C), ChkMgr(C.getASTContext(), *C.getAnalyzerOpts()), CTU(C),
Consumers(),
AMgr(C.getASTContext(), C.getDiagnostics(), Consumers,
CreateRegionStoreManager, CreateRangeConstraintManager, &ChkMgr,
*C.getAnalyzerOpts()),
VisitedCallees(), FS(),
Eng(CTU, AMgr, &VisitedCallees, &FS, ExprEngine::Inline_Regular) {}
};
class SuperRegionLivenessConsumer : public ExprEngineConsumer {
void performTest(const Decl *D) {
const auto *FD = findDeclByName<FieldDecl>(D, "x");
const auto *VD = findDeclByName<VarDecl>(D, "s");
assert(FD && VD);
// The variable must belong to a stack frame,
// otherwise SymbolReaper would think it's a global.
const StackFrameContext *SFC =
Eng.getAnalysisDeclContextManager().getStackFrame(D);
// Create regions for 's' and 's.x'.
const VarRegion *VR = Eng.getRegionManager().getVarRegion(VD, SFC);
const FieldRegion *FR = Eng.getRegionManager().getFieldRegion(FD, VR);
// Pass a null location context to the SymbolReaper so that
// it was thinking that the variable is dead.
SymbolReaper SymReaper((StackFrameContext *)nullptr, (Stmt *)nullptr,
Eng.getSymbolManager(), Eng.getStoreManager());
SymReaper.markLive(FR);
EXPECT_TRUE(SymReaper.isLiveRegion(VR));
}
public:
SuperRegionLivenessConsumer(CompilerInstance &C) : ExprEngineConsumer(C) {}
~SuperRegionLivenessConsumer() override {}
bool HandleTopLevelDecl(DeclGroupRef DG) override {
for (const auto *D : DG)
performTest(D);
return true;
}
};
class SuperRegionLivenessAction: public ASTFrontendAction {
public:
SuperRegionLivenessAction() {}
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &Compiler,
StringRef File) override {
return llvm::make_unique<SuperRegionLivenessConsumer>(Compiler);
}
};
// Test that marking s.x as live would also make s live.
TEST(SymbolReaper, SuperRegionLiveness) {
EXPECT_TRUE(tooling::runToolOnCode(new SuperRegionLivenessAction,
"void foo() { struct S { int x; } s; }"));
}
} // namespace
} // namespace ento
} // namespace clang
|
GitWeb