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| author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2016-09-11 16:38:18 +0000 |
|---|---|---|
| committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2016-09-11 16:38:18 +0000 |
| commit | cc9edace0cf5f496ee117ec41d1c448a7abc1280 (patch) | |
| tree | c7dcbfb7b09b3054ff3f3b3db582fac8b6300418 /llvm/lib/Support/DeltaAlgorithm.cpp | |
| parent | 085bbf1e2fb4f8c5924843426eaea99f64e84815 (diff) | |
| download | bcm5719-llvm-cc9edace0cf5f496ee117ec41d1c448a7abc1280.tar.gz bcm5719-llvm-cc9edace0cf5f496ee117ec41d1c448a7abc1280.zip | |
CodeGen: Turn on sentinel tracking for MachineInstr iterators
This is a prep commit before fixing MachineBasicBlock::reverse_iterator
invalidation semantics, ala r281167 for ilist::reverse_iterator. This
changes MachineBasicBlock::Instructions to track which node is the
sentinel regardless of LLVM_ENABLE_ABI_BREAKING_CHECKS.
There's almost no functionality change (aside from ABI). However, in
the rare configuration:
#if !defined(NDEBUG) && !defined(LLVM_ENABLE_ABI_BREAKING_CHECKS)
the isKnownSentinel() assertions in ilist_iterator<>::operator* suddenly
have teeth for MachineInstr. If these assertions start firing for your
out-of-tree backend, have a look at the suggestions in the commit
message for r279314, and at some of the commits leading up to it that
avoid dereferencing the end() iterator.
llvm-svn: 281168
Diffstat (limited to 'llvm/lib/Support/DeltaAlgorithm.cpp')
0 files changed, 0 insertions, 0 deletions
