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Distinguish between dead stores and dead initializations. 

llvm-svn: 53628
This commit is contained in:
Ted Kremenek 2008-07-15 18:06:32 +00:00
parent 24768e3dc4
commit 81bfc074c9
2 changed files with 20 additions and 10 deletions
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26
clang/lib/Analysis/DeadStores.cpp
View File

@ -37,16 +37,26 @@ public:
virtual ~DeadStoreObs() {}
void Report(VarDecl* V, bool inEnclosing, SourceLocation L, SourceRange R) {
void Report(VarDecl* V, bool inEnclosing, SourceLocation L, SourceRange R,
bool isInitialization = false) {
std::string name(V->getName());
std::string msg = inEnclosing
? "Although the value stored to '" + name +
"' is used in the enclosing expression, the value is never actually"
" read from '" + name + "'"
: "Value stored to '" + name + "' is never read";
BR.EmitBasicReport("dead store", msg.c_str(), L, R);
if (isInitialization) {
std::string msg = "Value stored to '" + name +
"' during its initialization is never read";
BR.EmitBasicReport("dead initialization", msg.c_str(), L, R);
}
else {
std::string msg = inEnclosing
? "Although the value stored to '" + name +
"' is used in the enclosing expression, the value is never actually"
" read from '" + name + "'"
: "Value stored to '" + name + "' is never read";
BR.EmitBasicReport("dead store", msg.c_str(), L, R);
}
}
void CheckVarDecl(VarDecl* VD, Expr* Ex, Expr* Val,
@ -124,7 +134,7 @@ public:
// a warning. This is because such initialization can be
// due to defensive programming.
if (!E->isConstantExpr(Ctx,NULL))
Report(V, false, V->getLocation(), E->getSourceRange());
Report(V, false, V->getLocation(), E->getSourceRange(), true);
}
}
}

2
clang/test/Analysis/conditional-op-missing-lhs.c
View File

@ -4,7 +4,7 @@ void f1()
{
int i;
int j = i ? : 1; // expected-warning{{use of uninitialized variable}} //expected-warning{{Value stored to 'j' is never read}}
int j = i ? : 1; // expected-warning{{use of uninitialized variable}} //expected-warning{{Value stored to 'j' during its initialization is never read}}
}
void *f2(int *i)