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Move the check for "calls setjmp" to SelectionDAGISel so that it can be used by

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more than just the stack slot coloring algorithm.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104722 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2010-05-26 19:46:12 +00:00
parent b2b31a6f93
commit 9af7e9a1b5
3 changed files with 50 additions and 33 deletions
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lib/CodeGen/StackSlotColoring.cpp
+1 -32
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@@ -162,34 +162,6 @@ 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) {
@@ -757,10 +729,7 @@ bool StackSlotColoring::runOnMachineFunction(MachineFunction &MF) {
// 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))
if (MF.callsSetJmp())
return false;
// Gather spill slot references