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Handle unindexed instructions in SlotIndices.

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SlotIndexes::insertMachineInstrInMaps would crash when trying to insert an
instruction imediately after an unmapped debug value.

llvm-svn: 107504
This commit is contained in:
Jakob Stoklund Olesen 2010-07-02 19:54:45 +00:00
parent cf6c5c960f
commit 9e2d9478f2
1 changed files with 12 additions and 7 deletions
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19
llvm/include/llvm/CodeGen/SlotIndexes.h
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@ -663,15 +663,20 @@ namespace llvm {
MachineBasicBlock::iterator miItr(mi);
bool needRenumber = false;
IndexListEntry *newEntry;
// Get previous index, considering that not all instructions are indexed.
IndexListEntry *prevEntry;
if (miItr == mbb->begin()) {
for (;;) {
// If mi is at the mbb beginning, get the prev index from the mbb.
prevEntry = &mbbRangeItr->second.first.entry();
} else {
// Otherwise get it from the previous instr.
MachineBasicBlock::iterator pItr(prior(miItr));
prevEntry = &getInstructionIndex(pItr).entry();
if (miItr == mbb->begin()) {
prevEntry = &mbbRangeItr->second.first.entry();
break;
}
// Otherwise rewind until we find a mapped instruction.
Mi2IndexMap::const_iterator itr = mi2iMap.find(--miItr);
if (itr != mi2iMap.end()) {
prevEntry = &itr->second.entry();
break;
}
}
// Get next entry from previous entry.