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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 | 0bd10f2af37e694f08f41199f4c6792c494430d9 (patch) | |
| tree | 9daba7d194d3f24d4ea9ad30136cca8056b828bf /lib | |
| parent | 8b1b4136a0cce28ab2740473be215d22e3b005a9 (diff) | |
Remove GC roots that reference dead objects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166763 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/GCStrategy.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/lib/CodeGen/GCStrategy.cpp b/lib/CodeGen/GCStrategy.cpp index 8de541de3d..f4755bb163 100644 --- a/lib/CodeGen/GCStrategy.cpp +++ b/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) { |