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[analyzer][Liveness][NFC] Get rid of statement liveness, because such a thing doesn't exist 

The summary and very short discussion in D82122 summarizes whats happening here.

In short, liveness talks about variables, or expressions, anything that
has a value. Well, statements just simply don't have a one.

Differential Revision: https://reviews.llvm.org/D82598
This commit is contained in:
Kristóf Umann 2020-09-15 17:43:02 +02:00
parent 01f5fcd829
commit dd1d5488e4
10 changed files with 151 additions and 145 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
clang/docs/analyzer/developer-docs/DebugChecks.rst
View File

@ -30,7 +30,7 @@ using a 'dot' format viewer (such as Graphviz on macOS) instead.
- debug.DumpLiveVars: Show the results of live variable analysis for each
top-level function being analyzed.
- debug.DumpLiveStmts: Show the results of live statement analysis for each
- debug.DumpLiveExprs: Show the results of live expression analysis for each
top-level function being analyzed.
- debug.ViewExplodedGraph: Show the Exploded Graphs generated for the

18
clang/include/clang/Analysis/Analyses/LiveVariables.h
View File

@ -30,22 +30,22 @@ public:
class LivenessValues {
public:
llvm::ImmutableSet<const Stmt *> liveStmts;
llvm::ImmutableSet<const Expr *> liveExprs;
llvm::ImmutableSet<const VarDecl *> liveDecls;
llvm::ImmutableSet<const BindingDecl *> liveBindings;
bool equals(const LivenessValues &V) const;
LivenessValues()
: liveStmts(nullptr), liveDecls(nullptr), liveBindings(nullptr) {}
: liveExprs(nullptr), liveDecls(nullptr), liveBindings(nullptr) {}
LivenessValues(llvm::ImmutableSet<const Stmt *> LiveStmts,
LivenessValues(llvm::ImmutableSet<const Expr *> liveExprs,
llvm::ImmutableSet<const VarDecl *> LiveDecls,
llvm::ImmutableSet<const BindingDecl *> LiveBindings)
: liveStmts(LiveStmts), liveDecls(LiveDecls),
: liveExprs(liveExprs), liveDecls(LiveDecls),
liveBindings(LiveBindings) {}
bool isLive(const Stmt *S) const;
bool isLive(const Expr *E) const;
bool isLive(const VarDecl *D) const;
friend class LiveVariables;
@ -83,17 +83,17 @@ public:
/// only returns liveness information for block-level expressions.
bool isLive(const Stmt *S, const VarDecl *D);
/// Returns true the block-level expression "value" is live
/// Returns true the block-level expression value is live
/// before the given block-level expression (see runOnAllBlocks).
bool isLive(const Stmt *Loc, const Stmt *StmtVal);
bool isLive(const Stmt *Loc, const Expr *Val);
/// Print to stderr the variable liveness information associated with
/// each basic block.
void dumpBlockLiveness(const SourceManager &M);
/// Print to stderr the statement liveness information associated with
/// Print to stderr the expression liveness information associated with
/// each basic block.
void dumpStmtLiveness(const SourceManager &M);
void dumpExprLiveness(const SourceManager &M);
void runOnAllBlocks(Observer &obs);

4
clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
View File

@ -1478,8 +1478,8 @@ def LiveVariablesDumper : Checker<"DumpLiveVars">,
HelpText<"Print results of live variable analysis">,
Documentation<NotDocumented>;
def LiveStatementsDumper : Checker<"DumpLiveStmts">,
HelpText<"Print results of live statement analysis">,
def LiveExpressionsDumper : Checker<"DumpLiveExprs">,
HelpText<"Print results of live expression analysis">,
Documentation<NotDocumented>;
def CFGViewer : Checker<"ViewCFG">,

2
clang/include/clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h
View File

@ -539,7 +539,7 @@ public:
bool isLive(SymbolRef sym);
bool isLiveRegion(const MemRegion *region);
bool isLive(const Stmt *ExprVal, const LocationContext *LCtx) const;
bool isLive(const Expr *ExprVal, const LocationContext *LCtx) const;
bool isLive(const VarRegion *VR, bool includeStoreBindings = false) const;
/// Unconditionally marks a symbol as live.

102
clang/lib/Analysis/LiveVariables.cpp
View File

@ -27,7 +27,7 @@ namespace {
class LiveVariablesImpl {
public:
AnalysisDeclContext &analysisContext;
llvm::ImmutableSet<const Stmt *>::Factory SSetFact;
llvm::ImmutableSet<const Expr *>::Factory ESetFact;
llvm::ImmutableSet<const VarDecl *>::Factory DSetFact;
llvm::ImmutableSet<const BindingDecl *>::Factory BSetFact;
llvm::DenseMap<const CFGBlock *, LiveVariables::LivenessValues> blocksEndToLiveness;
@ -45,16 +45,15 @@ public:
LiveVariables::Observer *obs = nullptr);
void dumpBlockLiveness(const SourceManager& M);
void dumpStmtLiveness(const SourceManager& M);
void dumpExprLiveness(const SourceManager& M);
LiveVariablesImpl(AnalysisDeclContext &ac, bool KillAtAssign)
: analysisContext(ac),
SSetFact(false), // Do not canonicalize ImmutableSets by default.
DSetFact(false), // This is a *major* performance win.
BSetFact(false),
killAtAssign(KillAtAssign) {}
: analysisContext(ac),
ESetFact(false), // Do not canonicalize ImmutableSets by default.
DSetFact(false), // This is a *major* performance win.
BSetFact(false), killAtAssign(KillAtAssign) {}
};
}
} // namespace
static LiveVariablesImpl &getImpl(void *x) {
return *((LiveVariablesImpl *) x);
@ -64,8 +63,8 @@ static LiveVariablesImpl &getImpl(void *x) {
// Operations and queries on LivenessValues.
//===----------------------------------------------------------------------===//
bool LiveVariables::LivenessValues::isLive(const Stmt *S) const {
return liveStmts.contains(S);
bool LiveVariables::LivenessValues::isLive(const Expr *E) const {
return liveExprs.contains(E);
}
bool LiveVariables::LivenessValues::isLive(const VarDecl *D) const {
@ -97,10 +96,10 @@ LiveVariables::LivenessValues
LiveVariablesImpl::merge(LiveVariables::LivenessValues valsA,
LiveVariables::LivenessValues valsB) {
llvm::ImmutableSetRef<const Stmt *>
SSetRefA(valsA.liveStmts.getRootWithoutRetain(), SSetFact.getTreeFactory()),
SSetRefB(valsB.liveStmts.getRootWithoutRetain(), SSetFact.getTreeFactory());
llvm::ImmutableSetRef<const Expr *> SSetRefA(
valsA.liveExprs.getRootWithoutRetain(), ESetFact.getTreeFactory()),
SSetRefB(valsB.liveExprs.getRootWithoutRetain(),
ESetFact.getTreeFactory());
llvm::ImmutableSetRef<const VarDecl *>
DSetRefA(valsA.liveDecls.getRootWithoutRetain(), DSetFact.getTreeFactory()),
@ -122,7 +121,7 @@ LiveVariablesImpl::merge(LiveVariables::LivenessValues valsA,
}
bool LiveVariables::LivenessValues::equals(const LivenessValues &V) const {
return liveStmts == V.liveStmts && liveDecls == V.liveDecls;
return liveExprs == V.liveExprs && liveDecls == V.liveDecls;
}
//===----------------------------------------------------------------------===//
@ -141,8 +140,8 @@ bool LiveVariables::isLive(const Stmt *S, const VarDecl *D) {
return isAlwaysAlive(D) || getImpl(impl).stmtsToLiveness[S].isLive(D);
}
bool LiveVariables::isLive(const Stmt *Loc, const Stmt *S) {
return getImpl(impl).stmtsToLiveness[Loc].isLive(S);
bool LiveVariables::isLive(const Stmt *Loc, const Expr *Val) {
return getImpl(impl).stmtsToLiveness[Loc].isLive(Val);
}
//===----------------------------------------------------------------------===//
@ -186,27 +185,27 @@ static const VariableArrayType *FindVA(QualType Ty) {
return nullptr;
}
static const Stmt *LookThroughStmt(const Stmt *S) {
while (S) {
if (const Expr *Ex = dyn_cast<Expr>(S))
S = Ex->IgnoreParens();
if (const FullExpr *FE = dyn_cast<FullExpr>(S)) {
S = FE->getSubExpr();
static const Expr *LookThroughExpr(const Expr *E) {
while (E) {
if (const Expr *Ex = dyn_cast<Expr>(E))
E = Ex->IgnoreParens();
if (const FullExpr *FE = dyn_cast<FullExpr>(E)) {
E = FE->getSubExpr();
continue;
}
if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(S)) {
S = OVE->getSourceExpr();
if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
E = OVE->getSourceExpr();
continue;
}
break;
}
return S;
return E;
}
static void AddLiveStmt(llvm::ImmutableSet<const Stmt *> &Set,
llvm::ImmutableSet<const Stmt *>::Factory &F,
const Stmt *S) {
Set = F.add(Set, LookThroughStmt(S));
static void AddLiveExpr(llvm::ImmutableSet<const Expr *> &Set,
llvm::ImmutableSet<const Expr *>::Factory &F,
const Expr *E) {
Set = F.add(Set, LookThroughExpr(E));
}
void TransferFunctions::Visit(Stmt *S) {
@ -215,8 +214,8 @@ void TransferFunctions::Visit(Stmt *S) {
StmtVisitor<TransferFunctions>::Visit(S);
if (isa<Expr>(S)) {
val.liveStmts = LV.SSetFact.remove(val.liveStmts, S);
if (const auto *E = dyn_cast<Expr>(S)) {
val.liveExprs = LV.ESetFact.remove(val.liveExprs, E);
}
// Mark all children expressions live.
@ -233,7 +232,7 @@ void TransferFunctions::Visit(Stmt *S) {
// Include the implicit "this" pointer as being live.
CXXMemberCallExpr *CE = cast<CXXMemberCallExpr>(S);
if (Expr *ImplicitObj = CE->getImplicitObjectArgument()) {
AddLiveStmt(val.liveStmts, LV.SSetFact, ImplicitObj);
AddLiveExpr(val.liveExprs, LV.ESetFact, ImplicitObj);
}
break;
}
@ -250,7 +249,7 @@ void TransferFunctions::Visit(Stmt *S) {
if (const VarDecl *VD = dyn_cast<VarDecl>(DS->getSingleDecl())) {
for (const VariableArrayType* VA = FindVA(VD->getType());
VA != nullptr; VA = FindVA(VA->getElementType())) {
AddLiveStmt(val.liveStmts, LV.SSetFact, VA->getSizeExpr());
AddLiveExpr(val.liveExprs, LV.ESetFact, VA->getSizeExpr());
}
}
break;
@ -263,7 +262,7 @@ void TransferFunctions::Visit(Stmt *S) {
if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(child))
child = OV->getSourceExpr();
child = child->IgnoreParens();
val.liveStmts = LV.SSetFact.add(val.liveStmts, child);
val.liveExprs = LV.ESetFact.add(val.liveExprs, child);
return;
}
@ -284,36 +283,39 @@ void TransferFunctions::Visit(Stmt *S) {
// If one of the branches is an expression rather than a compound
// statement, it will be bad if we mark it as live at the terminator
// of the if-statement (i.e., immediately after the condition expression).
AddLiveStmt(val.liveStmts, LV.SSetFact, cast<IfStmt>(S)->getCond());
AddLiveExpr(val.liveExprs, LV.ESetFact, cast<IfStmt>(S)->getCond());
return;
}
case Stmt::WhileStmtClass: {
// If the loop body is an expression rather than a compound statement,
// it will be bad if we mark it as live at the terminator of the loop
// (i.e., immediately after the condition expression).
AddLiveStmt(val.liveStmts, LV.SSetFact, cast<WhileStmt>(S)->getCond());
AddLiveExpr(val.liveExprs, LV.ESetFact, cast<WhileStmt>(S)->getCond());
return;
}
case Stmt::DoStmtClass: {
// If the loop body is an expression rather than a compound statement,
// it will be bad if we mark it as live at the terminator of the loop
// (i.e., immediately after the condition expression).
AddLiveStmt(val.liveStmts, LV.SSetFact, cast<DoStmt>(S)->getCond());
AddLiveExpr(val.liveExprs, LV.ESetFact, cast<DoStmt>(S)->getCond());
return;
}
case Stmt::ForStmtClass: {
// If the loop body is an expression rather than a compound statement,
// it will be bad if we mark it as live at the terminator of the loop
// (i.e., immediately after the condition expression).
AddLiveStmt(val.liveStmts, LV.SSetFact, cast<ForStmt>(S)->getCond());
AddLiveExpr(val.liveExprs, LV.ESetFact, cast<ForStmt>(S)->getCond());
return;
}
}
// HACK + FIXME: What is this? One could only guess that this is an attempt to
// fish for live values, for example, arguments from a call expression.
// Maybe we could take inspiration from UninitializedVariable analysis?
for (Stmt *Child : S->children()) {
if (Child)
AddLiveStmt(val.liveStmts, LV.SSetFact, Child);
if (const auto *E = dyn_cast_or_null<Expr>(Child))
AddLiveExpr(val.liveExprs, LV.ESetFact, E);
}
}
@ -416,7 +418,7 @@ VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *UE)
const Expr *subEx = UE->getArgumentExpr();
if (subEx->getType()->isVariableArrayType()) {
assert(subEx->isLValue());
val.liveStmts = LV.SSetFact.add(val.liveStmts, subEx->IgnoreParens());
val.liveExprs = LV.ESetFact.add(val.liveExprs, subEx->IgnoreParens());
}
}
@ -613,19 +615,19 @@ void LiveVariablesImpl::dumpBlockLiveness(const SourceManager &M) {
llvm::errs() << "\n";
}
void LiveVariables::dumpStmtLiveness(const SourceManager &M) {
getImpl(impl).dumpStmtLiveness(M);
void LiveVariables::dumpExprLiveness(const SourceManager &M) {
getImpl(impl).dumpExprLiveness(M);
}
void LiveVariablesImpl::dumpStmtLiveness(const SourceManager &M) {
void LiveVariablesImpl::dumpExprLiveness(const SourceManager &M) {
// Don't iterate over blockEndsToLiveness directly because it's not sorted.
for (auto I : *analysisContext.getCFG()) {
for (const CFGBlock *B : *analysisContext.getCFG()) {
llvm::errs() << "\n[ B" << I->getBlockID()
<< " (live statements at block exit) ]\n";
for (auto S : blocksEndToLiveness[I].liveStmts) {
llvm::errs() << "\n[ B" << B->getBlockID()
<< " (live expressions at block exit) ]\n";
for (const Expr *E : blocksEndToLiveness[B].liveExprs) {
llvm::errs() << "\n";
S->dump();
E->dump();
}
llvm::errs() << "\n";
}

10
clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
View File

@ -131,21 +131,21 @@ bool ento::shouldRegisterLiveVariablesDumper(const CheckerManager &mgr) {
//===----------------------------------------------------------------------===//
namespace {
class LiveStatementsDumper : public Checker<check::ASTCodeBody> {
class LiveExpressionsDumper : public Checker<check::ASTCodeBody> {
public:
void checkASTCodeBody(const Decl *D, AnalysisManager& Mgr,
BugReporter &BR) const {
if (LiveVariables *L = Mgr.getAnalysis<RelaxedLiveVariables>(D))
L->dumpStmtLiveness(Mgr.getSourceManager());
L->dumpExprLiveness(Mgr.getSourceManager());
}
};
}
void ento::registerLiveStatementsDumper(CheckerManager &mgr) {
mgr.registerChecker<LiveStatementsDumper>();
void ento::registerLiveExpressionsDumper(CheckerManager &mgr) {
mgr.registerChecker<LiveExpressionsDumper>();
}
bool ento::shouldRegisterLiveStatementsDumper(const CheckerManager &mgr) {
bool ento::shouldRegisterLiveExpressionsDumper(const CheckerManager &mgr) {
return true;
}

14
clang/lib/StaticAnalyzer/Core/Environment.cpp
View File

@ -191,19 +191,15 @@ EnvironmentManager::removeDeadBindings(Environment Env,
F.getTreeFactory());
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
for (Environment::iterator I = Env.begin(), End = Env.end(); I != End; ++I) {
const EnvironmentEntry &BlkExpr = I.getKey();
const SVal &X = I.getData();
const bool IsBlkExprLive =
SymReaper.isLive(BlkExpr.getStmt(), BlkExpr.getLocationContext());
const Expr *E = dyn_cast<Expr>(BlkExpr.getStmt());
if (!E)
continue;
assert((isa<Expr>(BlkExpr.getStmt()) || !IsBlkExprLive) &&
"Only Exprs can be live, LivenessAnalysis argues about the liveness "
"of *values*!");
if (IsBlkExprLive) {
if (SymReaper.isLive(E, BlkExpr.getLocationContext())) {
// Copy the binding to the new map.
EBMapRef = EBMapRef.add(BlkExpr, X);

2
clang/lib/StaticAnalyzer/Core/SymbolManager.cpp
View File

@ -489,7 +489,7 @@ bool SymbolReaper::isLive(SymbolRef sym) {
}
bool
SymbolReaper::isLive(const Stmt *ExprVal, const LocationContext *ELCtx) const {
SymbolReaper::isLive(const Expr *ExprVal, const LocationContext *ELCtx) const {
if (LCtx == nullptr)
return false;

90
clang/test/Analysis/live-stmts.cpp
View File

@ -1,4 +1,4 @@
// RUN: %clang_analyze_cc1 -w -analyzer-checker=debug.DumpLiveStmts %s 2>&1\
// RUN: %clang_analyze_cc1 -w -analyzer-checker=debug.DumpLiveExprs %s 2>&1\
// RUN: | FileCheck %s
int coin();
@ -7,13 +7,24 @@ int coin();
int testThatDumperWorks(int x, int y, int z) {
return x ? y : z;
}
// CHECK: [ B0 (live statements at block exit) ]
// [B5 (ENTRY)]
// |
// V
// [B4 (x)] ? [B2 (y)] : [B3 (z)]
// \ /
// ---|----
// V
// [B1] --> [B0 (EXIT)]
// return
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B1 (live statements at block exit) ]
// CHECK: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B2 (live statements at block exit) ]
// CHECK: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclRefExpr {{.*}} 'y' 'int'
// CHECK-EMPTY:
@ -24,7 +35,7 @@ int testThatDumperWorks(int x, int y, int z) {
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'x' 'int'
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B3 (live statements at block exit) ]
// CHECK: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclRefExpr {{.*}} 'y' 'int'
// CHECK-EMPTY:
@ -33,7 +44,7 @@ int testThatDumperWorks(int x, int y, int z) {
// CHECK-NEXT: ImplicitCastExpr {{.*}} <IntegralToBoolean>
// CHECK-NEXT: `-ImplicitCastExpr {{.*}} <LValueToRValue>
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'x' 'int'
// CHECK: [ B4 (live statements at block exit) ]
// CHECK: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclRefExpr {{.*}} 'y' 'int'
// CHECK-EMPTY:
@ -44,7 +55,7 @@ int testThatDumperWorks(int x, int y, int z) {
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'x' 'int'
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B5 (live statements at block exit) ]
// CHECK: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclRefExpr {{.*}} 'y' 'int'
// CHECK-EMPTY:
@ -61,22 +72,22 @@ void testIfBranchExpression(bool flag) {
e;
}
}
// CHECK: [ B0 (live statements at block exit) ]
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B1 (live statements at block exit) ]
// CHECK: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B2 (live statements at block exit) ]
// CHECK: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B3 (live statements at block exit) ]
// CHECK: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B4 (live statements at block exit) ]
// CHECK: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B5 (live statements at block exit) ]
// CHECK: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
@ -89,22 +100,22 @@ void testWhileBodyExpression(bool flag) {
e;
}
}
// CHECK: [ B0 (live statements at block exit) ]
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B1 (live statements at block exit) ]
// CHECK: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B2 (live statements at block exit) ]
// CHECK: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B3 (live statements at block exit) ]
// CHECK: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B4 (live statements at block exit) ]
// CHECK: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B5 (live statements at block exit) ]
// CHECK: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
@ -118,22 +129,22 @@ void testDoWhileBodyExpression(bool flag) {
while (coin());
}
}
// CHECK: [ B0 (live statements at block exit) ]
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B1 (live statements at block exit) ]
// CHECK: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B2 (live statements at block exit) ]
// CHECK: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B3 (live statements at block exit) ]
// CHECK: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B4 (live statements at block exit) ]
// CHECK: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B5 (live statements at block exit) ]
// CHECK: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
@ -146,22 +157,39 @@ void testForBodyExpression(bool flag) {
e;
}
}
// CHECK: [ B0 (live statements at block exit) ]
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B1 (live statements at block exit) ]
// CHECK: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B2 (live statements at block exit) ]
// CHECK: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B3 (live statements at block exit) ]
// CHECK: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B4 (live statements at block exit) ]
// CHECK: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK: [ B5 (live statements at block exit) ]
// CHECK: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
void clang_analyzer_eval(bool);
void test_lambda_refcapture() {
int a = 6;
[&](int &a) { a = 42; }(a);
clang_analyzer_eval(a == 42); // expected-warning{{TRUE}}
}
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:

52
clang/test/Analysis/live-stmts.mm
View File

@ -1,5 +1,5 @@
// RUN: %clang_analyze_cc1 -w -fblocks %s \
// RUN: -analyzer-checker=debug.DumpLiveStmts \
// RUN: -analyzer-checker=debug.DumpLiveExprs \
// RUN: 2>&1 | FileCheck %s
@interface Item
@ -18,25 +18,25 @@ struct RAII {
public:
RAII(Blk blk): blk(blk) {}
// CHECK: [ B0 (live statements at block exit) ]
// CHECK: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B1 (live statements at block exit) ]
// CHECK-NEXT: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B2 (live statements at block exit) ]
// CHECK-NEXT: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
~RAII() { blk(); }
// CHECK-NEXT: [ B0 (live statements at block exit) ]
// CHECK-NEXT: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B1 (live statements at block exit) ]
// CHECK-NEXT: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B2 (live statements at block exit) ]
// CHECK-NEXT: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
};
@ -45,57 +45,37 @@ void foo(Collection *coll) {
RAII raii(^{});
for (Item *item in coll) {}
}
// CHECK-NEXT: [ B0 (live statements at block exit) ]
// CHECK-NEXT: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B1 (live statements at block exit) ]
// CHECK-NEXT: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B2 (live statements at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclStmt {{.*}}
// CHECK-NEXT: `-VarDecl {{.*}} item 'Item *'
// CHECK-NEXT: [ B2 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'Collection *' <LValueToRValue>
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'Collection *' lvalue ParmVar {{.*}} 'coll' 'Collection *'
// CHECK-EMPTY:
// CHECK-NEXT: CompoundStmt {{.*}}
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B3 (live statements at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclStmt {{.*}}
// CHECK-NEXT: `-VarDecl {{.*}} item 'Item *'
// CHECK-NEXT: [ B3 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'Collection *' <LValueToRValue>
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'Collection *' lvalue ParmVar {{.*}} 'coll' 'Collection *'
// CHECK-EMPTY:
// CHECK-NEXT: CompoundStmt {{.*}}
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B4 (live statements at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclStmt {{.*}}
// CHECK-NEXT: `-VarDecl {{.*}} item 'Item *'
// CHECK-NEXT: [ B4 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: ImplicitCastExpr {{.*}} 'Collection *' <LValueToRValue>
// CHECK-NEXT: `-DeclRefExpr {{.*}} 'Collection *' lvalue ParmVar {{.*}} 'coll' 'Collection *'
// CHECK-EMPTY:
// CHECK-NEXT: CompoundStmt {{.*}}
// CHECK-EMPTY:
// CHECK-NEXT: [ B5 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B5 (live statements at block exit) ]
// CHECK-EMPTY:
// CHECK-NEXT: DeclStmt {{.*}}
// CHECK-NEXT: `-VarDecl {{.*}} item 'Item *'
// CHECK-EMPTY:
// CHECK-NEXT: CompoundStmt {{.*}}
// CHECK-NEXT: [ B0 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B0 (live statements at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY:
// CHECK-NEXT: [ B1 (live statements at block exit) ]
// CHECK-NEXT: [ B1 (live expressions at block exit) ]
// CHECK-EMPTY:
// CHECK-EMPTY: