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Fixed bug in 'LiveVariables' analysis where we incorrectly marked a variable 

dead at an assignment without taking into account if the variable was used in
the RHS of the assignment.

llvm-svn: 46153
This commit is contained in:
Ted Kremenek 2008-01-18 00:40:21 +00:00
parent b716fbab44
commit 05ecfddfc3
1 changed files with 5 additions and 2 deletions
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7
clang/Analysis/LiveVariables.cpp
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@ -77,10 +77,9 @@ void TransferFuncs::Visit(Stmt *S) {
if (AD.Observer)
AD.Observer->ObserveStmt(S,AD,LiveState);
if (S == getCurrentBlkStmt()) {
StmtVisitor<TransferFuncs,void>::Visit(S);
if (getCFG().isBlkExpr(S)) LiveState(S,AD) = Dead;
StmtVisitor<TransferFuncs,void>::Visit(S);
}
else if (!getCFG().isBlkExpr(S))
StmtVisitor<TransferFuncs,void>::Visit(S);
@ -199,6 +198,10 @@ bool LiveVariables::isLive(const Stmt* Loc, const Stmt* StmtVal) const {
return getStmtData(Loc)(StmtVal,getAnalysisData());
}
bool LiveVariables::isLive(const Stmt* Loc, const VarDecl* D) const {
return getStmtData(Loc)(D,getAnalysisData());
}
//===----------------------------------------------------------------------===//
// printing liveness state for debugging
//