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| author | Nicolas Geoffray <nicolas.geoffray@lip6.fr> | 2012-10-26 09:15:55 +0000 |
|---|---|---|
| committer | Nicolas Geoffray <nicolas.geoffray@lip6.fr> | 2012-10-26 09:15:55 +0000 |
| commit | 457b356f3ab2b846fb95a43a34da63aec5e56c74 (patch) | |
| tree | 0b39633df51a41260f56f6dca624dd242248a57a /llvm/lib/CodeGen/GCStrategy.cpp | |
| parent | 4027f238eb0181178c668213c65276729f20873f (diff) | |
| download | bcm5719-llvm-457b356f3ab2b846fb95a43a34da63aec5e56c74.tar.gz bcm5719-llvm-457b356f3ab2b846fb95a43a34da63aec5e56c74.zip | |
Remove GC roots that reference dead objects.
llvm-svn: 166763
Diffstat (limited to 'llvm/lib/CodeGen/GCStrategy.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/GCStrategy.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/GCStrategy.cpp b/llvm/lib/CodeGen/GCStrategy.cpp index 8de541de3d9..f4755bb1635 100644 --- a/llvm/lib/CodeGen/GCStrategy.cpp +++ b/llvm/lib/CodeGen/GCStrategy.cpp @@ -388,9 +388,16 @@ void GCMachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) { const TargetFrameLowering *TFI = TM->getFrameLowering(); assert(TFI && "TargetRegisterInfo not available!"); - for (GCFunctionInfo::roots_iterator RI = FI->roots_begin(), - RE = FI->roots_end(); RI != RE; ++RI) - RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num); + for (GCFunctionInfo::roots_iterator RI = FI->roots_begin(); + RI != FI->roots_end();) { + // If the root references a dead object, no need to keep it. + if (MF.getFrameInfo()->isDeadObjectIndex(RI->Num)) { + RI = FI->removeStackRoot(RI); + } else { + RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num); + ++RI; + } + } } bool GCMachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) { |
