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Improve CheckFallThrough analysis in the presense of the new C++ EH 

support.  WIP.

llvm-svn: 93956
This commit is contained in:
Mike Stump 2010-01-20 00:34:04 +00:00
parent 9074c3fe97
commit 06b602e540
1 changed files with 10 additions and 1 deletions
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11
clang/lib/Sema/SemaDecl.cpp
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@ -1496,6 +1496,7 @@ Sema::ControlFlowKind Sema::CheckFallThrough(AnalysisContext &AC) {
bool HasLiveReturn = false;
bool HasFakeEdge = false;
bool HasPlainEdge = false;
bool HasAbnormalEdge = false;
for (CFGBlock::pred_iterator I=cfg->getExit().pred_begin(),
E = cfg->getExit().pred_end();
I != E;
@ -1528,9 +1529,17 @@ Sema::ControlFlowKind Sema::CheckFallThrough(AnalysisContext &AC) {
continue;
}
}
if (isa<CXXTryStmt>(S)) {
HasAbnormalEdge = true;
continue;
}
bool NoReturnEdge = false;
if (CallExpr *C = dyn_cast<CallExpr>(S)) {
if (B.succ_begin()[0] != &cfg->getExit()) {
HasAbnormalEdge = true;
continue;
}
Expr *CEE = C->getCallee()->IgnoreParenCasts();
if (CEE->getType().getNoReturnAttr()) {
NoReturnEdge = true;
@ -1552,7 +1561,7 @@ Sema::ControlFlowKind Sema::CheckFallThrough(AnalysisContext &AC) {
return NeverFallThrough;
return NeverFallThroughOrReturn;
}
if (HasFakeEdge || HasLiveReturn)
if (HasAbnormalEdge || HasFakeEdge || HasLiveReturn)
return MaybeFallThrough;
// This says AlwaysFallThrough for calls to functions that are not marked
// noreturn, that don't return. If people would like this warning to be more