This revision was automatically updated to reflect the committed changes.
Closed by commit rC361682: [analyzer] Add a prunable note for skipping vbase
inits in subclasses. (authored by dergachev, committed by ).
Changed prior to commit:
https://reviews.llvm.org/D61817?vs=201359&id=201364#toc
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D61817/new/
https://reviews.llvm.org/D61817
Files:
include/clang/StaticAnalyzer/Core/BugReporter/BugReporter.h
include/clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h
include/clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h
lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
lib/StaticAnalyzer/Core/CoreEngine.cpp
lib/StaticAnalyzer/Core/PathDiagnostic.cpp
test/Analysis/diagnostics/initializer.cpp
Index: lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
===================================================================
--- lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
+++ lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
@@ -2501,7 +2501,9 @@
if (Optional<std::string> Msg = T->generateMessage(BRC, R)) {
PathDiagnosticLocation Loc =
PathDiagnosticLocation::create(PP, BRC.getSourceManager());
- return std::make_shared<PathDiagnosticEventPiece>(Loc, *Msg);
+ auto Piece = std::make_shared<PathDiagnosticEventPiece>(Loc, *Msg);
+ Piece->setPrunable(T->isPrunable());
+ return Piece;
}
return nullptr;
Index: lib/StaticAnalyzer/Core/CoreEngine.cpp
===================================================================
--- lib/StaticAnalyzer/Core/CoreEngine.cpp
+++ lib/StaticAnalyzer/Core/CoreEngine.cpp
@@ -216,6 +216,25 @@
LC->getDecl(),
LC->getCFG()->getNumBlockIDs());
+ // Display a prunable path note to the user if it's a virtual bases branch
+ // and we're taking the path that skips virtual base constructors.
+ if (L.getSrc()->getTerminator().isVirtualBaseBranch() &&
+ L.getDst() == *L.getSrc()->succ_begin()) {
+ ProgramPoint P = L.withTag(getNoteTags().makeNoteTag(
+ [](BugReporterContext &, BugReport &) -> std::string {
+ // TODO: Just call out the name of the most derived class
+ // when we know it.
+ return "Virtual base initialization skipped because "
+ "it has already been handled by the most derived class";
+ }, /*IsPrunable=*/true));
+ // Perform the transition.
+ ExplodedNodeSet Dst;
+ NodeBuilder Bldr(Pred, Dst, BuilderCtx);
+ Pred = Bldr.generateNode(P, Pred->getState(), Pred);
+ if (!Pred)
+ return;
+ }
+
// Check if we are entering the EXIT block.
if (Blk == &(L.getLocationContext()->getCFG()->getExit())) {
assert(L.getLocationContext()->getCFG()->getExit().empty() &&
Index: lib/StaticAnalyzer/Core/PathDiagnostic.cpp
===================================================================
--- lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -724,7 +724,15 @@
const Stmt* S = nullptr;
if (Optional<BlockEdge> BE = P.getAs<BlockEdge>()) {
const CFGBlock *BSrc = BE->getSrc();
- S = BSrc->getTerminatorCondition();
+ if (BSrc->getTerminator().isVirtualBaseBranch()) {
+ // TODO: VirtualBaseBranches should also appear for destructors.
+ // In this case we should put the diagnostic at the end of decl.
+ return PathDiagnosticLocation::createBegin(
+ P.getLocationContext()->getDecl(), SMng);
+
+ } else {
+ S = BSrc->getTerminatorCondition();
+ }
} else if (Optional<StmtPoint> SP = P.getAs<StmtPoint>()) {
S = SP->getStmt();
if (P.getAs<PostStmtPurgeDeadSymbols>())
Index: include/clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h
===================================================================
--- include/clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h
+++ include/clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h
@@ -156,8 +156,6 @@
/// The flag, which specifies the mode of inlining for the engine.
InliningModes HowToInline;
- NoteTag::Factory NoteTags;
-
public:
ExprEngine(cross_tu::CrossTranslationUnitContext &CTU, AnalysisManager &mgr,
SetOfConstDecls *VisitedCalleesIn,
@@ -399,7 +397,7 @@
SymbolManager &getSymbolManager() { return SymMgr; }
MemRegionManager &getRegionManager() { return MRMgr; }
- NoteTag::Factory &getNoteTags() { return NoteTags; }
+ NoteTag::Factory &getNoteTags() { return Engine.getNoteTags(); }
// Functions for external checking of whether we have unfinished work
Index: include/clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h
===================================================================
--- include/clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h
+++ include/clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h
@@ -19,6 +19,7 @@
#include "clang/Analysis/CFG.h"
#include "clang/Analysis/ProgramPoint.h"
#include "clang/Basic/LLVM.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/BlockCounter.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ExplodedGraph.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h"
@@ -95,6 +96,10 @@
/// (This data is owned by AnalysisConsumer.)
FunctionSummariesTy *FunctionSummaries;
+ /// Add path note tags along the path when we see that something interesting
+ /// is happening. This field is the allocator for such tags.
+ NoteTag::Factory NoteTags;
+
void generateNode(const ProgramPoint &Loc,
ProgramStateRef State,
ExplodedNode *Pred);
@@ -194,6 +199,8 @@
/// Enqueue a single node created as a result of statement processing.
void enqueueStmtNode(ExplodedNode *N, const CFGBlock *Block, unsigned Idx);
+
+ NoteTag::Factory &getNoteTags() { return NoteTags; }
};
// TODO: Turn into a class.
Index: include/clang/StaticAnalyzer/Core/BugReporter/BugReporter.h
===================================================================
--- include/clang/StaticAnalyzer/Core/BugReporter/BugReporter.h
+++ include/clang/StaticAnalyzer/Core/BugReporter/BugReporter.h
@@ -604,8 +604,10 @@
static int Kind;
const Callback Cb;
+ const bool IsPrunable;
- NoteTag(Callback &&Cb) : ProgramPointTag(&Kind), Cb(std::move(Cb)) {}
+ NoteTag(Callback &&Cb, bool IsPrunable)
+ : ProgramPointTag(&Kind), Cb(std::move(Cb)), IsPrunable(IsPrunable) {}
public:
static bool classof(const ProgramPointTag *T) {
@@ -628,15 +630,17 @@
return "Note Tag";
}
+ bool isPrunable() const { return IsPrunable; }
+
// Manage memory for NoteTag objects.
class Factory {
std::vector<std::unique_ptr<NoteTag>> Tags;
public:
- const NoteTag *makeNoteTag(Callback &&Cb) {
+ const NoteTag *makeNoteTag(Callback &&Cb, bool IsPrunable = false) {
// We cannot use make_unique because we cannot access the private
// constructor from inside it.
- std::unique_ptr<NoteTag> T(new NoteTag(std::move(Cb)));
+ std::unique_ptr<NoteTag> T(new NoteTag(std::move(Cb), IsPrunable));
Tags.push_back(std::move(T));
return Tags.back().get();
}
Index: test/Analysis/diagnostics/initializer.cpp
===================================================================
--- test/Analysis/diagnostics/initializer.cpp
+++ test/Analysis/diagnostics/initializer.cpp
@@ -0,0 +1,44 @@
+// RUN: %clang_analyze_cc1 -w -analyzer-checker=core -analyzer-output=text \
+// RUN: -verify %s
+
+namespace note_on_skipped_vbases {
+struct A {
+ int x;
+ A() : x(0) {} // expected-note{{The value 0 is assigned to 'c.x'}}
+ A(int x) : x(x) {}
+};
+
+struct B : virtual A {
+ int y;
+ // This note appears only once, when this constructor is called from C.
+ // When this constructor is called from D, this note is still correct but
+ // it doesn't appear because it's pruned out because it's irrelevant to the
+ // bug report.
+ B(): // expected-note{{Virtual base initialization skipped because it has already been handled by the most derived class}}
+ A(1),
+ y(1 / x) // expected-warning{{Division by zero}}
+ // expected-note@-1{{Division by zero}}
+ {}
+};
+
+struct C : B {
+ C(): // expected-note{{Calling default constructor for 'A'}}
+ // expected-note@-1{{Returning from default constructor for 'A'}}
+ B() // expected-note{{Calling default constructor for 'B'}}
+ {}
+};
+
+void test_note() {
+ C c; // expected-note{{Calling default constructor for 'C'}}
+}
+
+struct D: B {
+ D() : A(1), B() {}
+};
+
+void test_prunability() {
+ D d;
+ 1 / 0; // expected-warning{{Division by zero}}
+ // expected-note@-1{{Division by zero}}
+}
+} // namespace note_on_skipped_vbases
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