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Temporarily revert r104655 as it's breaking the bots.

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llvm-svn: 104664
This commit is contained in:
Eric Christopher
2010-05-26 01:59:55 +00:00
parent a6897ecbb5
commit e805ea9e39
3 changed files with 38 additions and 53 deletions
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42
llvm/lib/CodeGen/StackSlotColoring.cpp
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@@ -118,6 +118,7 @@ namespace {
private:
void InitializeSlots();
bool CheckForSetJmpCall(const MachineFunction &MF) const;
void ScanForSpillSlotRefs(MachineFunction &MF);
bool OverlapWithAssignments(LiveInterval *li, int Color) const;
int ColorSlot(LiveInterval *li);
@@ -161,6 +162,34 @@ namespace {
};
}
/// CheckForSetJmpCall - Return true if there's a call to setjmp/sigsetjmp in
/// this function.
bool StackSlotColoring::CheckForSetJmpCall(const MachineFunction &MF) const {
const Function *F = MF.getFunction();
const Module *M = F->getParent();
const Function *SetJmp = M->getFunction("setjmp");
const Function *SigSetJmp = M->getFunction("sigsetjmp");
if (!SetJmp && !SigSetJmp)
return false;
if (SetJmp && !SetJmp->use_empty())
for (Value::const_use_iterator
I = SetJmp->use_begin(), E = SetJmp->use_end(); I != E; ++I)
if (const CallInst *CI = dyn_cast<CallInst>(I))
if (CI->getParent()->getParent() == F)
return true;
if (SigSetJmp && !SigSetJmp->use_empty())
for (Value::const_use_iterator
I = SigSetJmp->use_begin(), E = SigSetJmp->use_end(); I != E; ++I)
if (const CallInst *CI = dyn_cast<CallInst>(I))
if (CI->getParent()->getParent() == F)
return true;
return false;
}
/// ScanForSpillSlotRefs - Scan all the machine instructions for spill slot
/// references and update spill slot weights.
void StackSlotColoring::ScanForSpillSlotRefs(MachineFunction &MF) {
@@ -724,11 +753,14 @@ bool StackSlotColoring::runOnMachineFunction(MachineFunction &MF) {
return false;
}
// If there is a call to a function with the attribute "returns_twice" (like
// setjmp or sigsetjmp), don't perform stack slot coloring. The stack could be
// modified before the the second return, resulting in the wrong value being
// used afterwards. (See <rdar://problem/8007500>.)
if (MF.hasReturnsTwiceCall())
// If there are calls to setjmp or sigsetjmp, don't perform stack slot
// coloring. The stack could be modified before the longjmp is executed,
// resulting in the wrong value being used afterwards. (See
// <rdar://problem/8007500>.)
//
// FIXME: This goes beyond the setjmp/sigsetjmp functions. Ideally, we should
// check for the GCC "returns twice" attribute.
if (CheckForSetJmpCall(MF))
return false;
// Gather spill slot references