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author | Devang Patel <dpatel@apple.com> | 2010-05-26 20:18:50 +0000 |
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committer | Devang Patel <dpatel@apple.com> | 2010-05-26 20:18:50 +0000 |
commit | 394427b014a7126e56f3ee411993f08677d93c83 (patch) | |
tree | 58bea89a7c1a2c8aadb32728fc81b44be518e2a2 /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | |
parent | b106543592abcaabdbe929dd05d914f613f00af2 (diff) | |
download | external_llvm-394427b014a7126e56f3ee411993f08677d93c83.zip external_llvm-394427b014a7126e56f3ee411993f08677d93c83.tar.gz external_llvm-394427b014a7126e56f3ee411993f08677d93c83.tar.bz2 |
Update debug info when live-in reg is copied into a vreg.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104732 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index fc830ac..3f3d4c9 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -250,6 +250,13 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { MachineBasicBlock *EntryMBB = MF->begin(); RegInfo->EmitLiveInCopies(EntryMBB, TRI, TII); + DenseMap<unsigned, unsigned> LiveInMap; + if (!FuncInfo->ArgDbgValues.empty()) + for (MachineRegisterInfo::livein_iterator LI = RegInfo->livein_begin(), + E = RegInfo->livein_end(); LI != E; ++LI) + if (LI->second) + LiveInMap.insert(std::make_pair(LI->first, LI->second)); + // Insert DBG_VALUE instructions for function arguments to the entry block. for (unsigned i = 0, e = FuncInfo->ArgDbgValues.size(); i != e; ++i) { MachineInstr *MI = FuncInfo->ArgDbgValues[e-i-1]; @@ -262,6 +269,21 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { // FIXME: VR def may not be in entry block. Def->getParent()->insert(llvm::next(InsertPos), MI); } + + // If Reg is live-in then update debug info to track its copy in a vreg. + DenseMap<unsigned, unsigned>::iterator LDI = LiveInMap.find(Reg); + if (LDI != LiveInMap.end()) { + MachineInstr *Def = RegInfo->getVRegDef(LDI->second); + MachineBasicBlock::iterator InsertPos = Def; + const MDNode *Variable = + MI->getOperand(MI->getNumOperands()-1).getMetadata(); + unsigned Offset = MI->getOperand(1).getImm(); + // Def is never a terminator here, so it is ok to increment InsertPos. + BuildMI(*EntryMBB, ++InsertPos, MI->getDebugLoc(), + TII.get(TargetOpcode::DBG_VALUE)) + .addReg(LDI->second, RegState::Debug) + .addImm(Offset).addMetadata(Variable); + } } // Determine if there are any calls in this machine function. |