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Automatically merge the landingpad clauses when we come across a callee's

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landingpad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136329 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-07-28 02:40:13 +00:00
parent 4ebc5916e9
commit e8ce880f1a
1 changed files with 12 additions and 28 deletions
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40
lib/Transforms/Utils/InlineFunction.cpp
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@ -250,7 +250,7 @@ namespace {
PHINode *InnerSelectorPHI;
SmallVector<Value*, 8> UnwindDestPHIValues;
SmallVector<LandingPadInst*, 16> CalleeLPads;
PHINode *InnerEHValuesPHI;
LandingPadInst *CallerLPad;
BasicBlock *SplitLPad;
@ -258,7 +258,7 @@ namespace {
InvokeInliningInfo(InvokeInst *II)
: OuterUnwindDest(II->getUnwindDest()), OuterSelector(0),
InnerUnwindDest(0), InnerExceptionPHI(0), InnerSelectorPHI(0),
CallerLPad(0), SplitLPad(0) {
InnerEHValuesPHI(0), CallerLPad(0), SplitLPad(0) {
// If there are PHI nodes in the unwind destination block, we
// need to keep track of which values came into them from the
// invoke before removing the edge from this block.
@ -289,10 +289,6 @@ namespace {
BasicBlock *getInnerUnwindDest();
void addCalleeLandingPad(LandingPadInst *LPI) {
CalleeLPads.push_back(LPI);
}
LandingPadInst *getLandingPadInst() const { return CallerLPad; }
BasicBlock *getSplitLandingPad() {
if (SplitLPad) return SplitLPad;
@ -311,11 +307,6 @@ namespace {
/// to there.
void forwardResume(ResumeInst *RI);
/// mergeLandingPadClauses - Visit all of the landing pad instructions which
/// supply the value for the ResumeInst, and merge the clauses from the new
/// destination (the caller's landing pad).
void mergeLandingPadClauses(ResumeInst *RI);
/// addIncomingPHIValuesFor - Add incoming-PHI values to the unwind
/// destination block for the given basic block, using the values for the
/// original invoke's source block.
@ -436,16 +427,6 @@ bool InvokeInliningInfo::forwardEHResume(CallInst *call, BasicBlock *src) {
return true;
}
/// mergeLandingPadClauses - Visit all of the landing pad instructions merge the
/// clauses from the new destination (the caller's landing pad).
void InvokeInliningInfo::mergeLandingPadClauses(ResumeInst *RI) {
for (SmallVectorImpl<LandingPadInst*>::iterator
I = CalleeLPads.begin(), E = CalleeLPads.end(); I != E; ++I)
for (unsigned i = 0, e = CallerLPad->getNumClauses(); i != e; ++i)
(*I)->addClause(CallerLPad->getClauseType(i),
CallerLPad->getClauseValue(i));
}
/// forwardResume - Forward the 'resume' instruction to the caller's landing pad
/// block. When the landing pad block has only one predecessor, this is a simple
/// branch. When there is more than one predecessor, we need to split the
@ -498,15 +479,19 @@ static bool isCleanupOnlySelector(EHSelectorInst *selector) {
/// Returns true to indicate that the next block should be skipped.
static bool HandleCallsInBlockInlinedThroughInvoke(BasicBlock *BB,
InvokeInliningInfo &Invoke) {
LandingPadInst *LPI = Invoke.getLandingPadInst();
for (BasicBlock::iterator BBI = BB->begin(), E = BB->end(); BBI != E; ) {
Instruction *I = BBI++;
// Collect the callee's landingpad instructions.
if (LandingPadInst *LPI = dyn_cast<LandingPadInst>(I)) {
Invoke.addCalleeLandingPad(LPI);
continue;
}
if (LPI) // FIXME: This won't be NULL in the new EH.
if (LandingPadInst *L = dyn_cast<LandingPadInst>(I)) {
unsigned NumClauses = LPI->getNumClauses();
L->reserveClauses(NumClauses);
for (unsigned i = 0; i != NumClauses; ++i)
L->addClause(LPI->getClauseType(i), LPI->getClauseValue(i));
}
// We only need to check for function calls: inlined invoke
// instructions require no special handling.
CallInst *CI = dyn_cast<CallInst>(I);
@ -642,7 +627,6 @@ static void HandleInlinedInvoke(InvokeInst *II, BasicBlock *FirstNewBlock,
}
if (ResumeInst *RI = dyn_cast<ResumeInst>(BB->getTerminator())) {
Invoke.mergeLandingPadClauses(RI);
Invoke.forwardResume(RI);
}
}