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[analyzer] TrackConstraintBRVisitor: Do not track unknown values 

Summary: -

Reviewers: NoQ, Szelethus

Reviewed By: NoQ, Szelethus

Differential Revision: https://reviews.llvm.org/D66267

llvm-svn: 369604
This commit is contained in:
Csaba Dabis 2019-08-22 00:06:58 +00:00
parent edb08da450
commit b73a5711f6
2 changed files with 8 additions and 11 deletions
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7
clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
View File

@ -1992,9 +1992,10 @@ bool bugreporter::trackExpressionValue(const ExplodedNode *InputNode,
report.markInteresting(V, TKind);
report.addVisitor(std::make_unique<UndefOrNullArgVisitor>(R));
// If the contents are symbolic, find out when they became null.
if (V.getAsLocSymbol(/*IncludeBaseRegions*/ true))
report.addVisitor(std::make_unique<TrackConstraintBRVisitor>(
// If the contents are symbolic and null, find out when they became null.
if (V.getAsLocSymbol(/*IncludeBaseRegions=*/true))
if (LVState->isNull(V).isConstrainedTrue())
report.addVisitor(std::make_unique<TrackConstraintBRVisitor>(
V.castAs<DefinedSVal>(), false));
// Add visitor, which will suppress inline defensive checks.

12
clang/test/Analysis/cast-value.cpp
View File

@ -152,8 +152,7 @@ void evalReferences(const Shape &S) {
void evalNonNullParamNonNullReturnReference(const Shape &S) {
const auto *C = dyn_cast_or_null<Circle>(S);
// expected-note@-1 {{Assuming dynamic cast from 'Shape' to 'Circle' succeeds}}
// expected-note@-2 {{Assuming pointer value is null}}
// expected-note@-3 {{'C' initialized here}}
// expected-note@-2 {{'C' initialized here}}
(void)(1 / !(bool)C);
// expected-note@-1 {{'C' is non-null}}
@ -165,8 +164,7 @@ void evalNonNullParamNonNullReturnReference(const Shape &S) {
void evalNonNullParamNonNullReturn(const Shape *S) {
const auto *C = cast<Circle>(S);
// expected-note@-1 {{Checked cast from 'Shape' to 'Circle' succeeds}}
// expected-note@-2 {{Assuming pointer value is null}}
// expected-note@-3 {{'C' initialized here}}
// expected-note@-2 {{'C' initialized here}}
(void)(1 / !(bool)C);
// expected-note@-1 {{'C' is non-null}}
@ -178,7 +176,6 @@ void evalNonNullParamNonNullReturn(const Shape *S) {
void evalNonNullParamNullReturn(const Shape *S) {
const auto *C = dyn_cast_or_null<Circle>(S);
// expected-note@-1 {{Assuming dynamic cast from 'Shape' to 'Circle' fails}}
// expected-note@-2 {{Assuming pointer value is null}}
if (const auto *T = dyn_cast_or_null<Triangle>(S)) {
// expected-note@-1 {{Assuming dynamic cast from 'Shape' to 'Triangle' succeeds}}
@ -207,9 +204,8 @@ void evalNullParamNullReturn(const Shape *S) {
void evalZeroParamNonNullReturnPointer(const Shape *S) {
const auto *C = S->castAs<Circle>();
// expected-note@-1 {{Assuming pointer value is null}}
// expected-note@-2 {{Checked cast to 'Circle' succeeds}}
// expected-note@-3 {{'C' initialized here}}
// expected-note@-1 {{Checked cast to 'Circle' succeeds}}
// expected-note@-2 {{'C' initialized here}}
(void)(1 / !(bool)C);
// expected-note@-1 {{'C' is non-null}}