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Stub out a new LiveDebugVariables pass.

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This analysis is going to run immediately after LiveIntervals. It will stay
alive during register allocation and keep track of user variables mentioned in
DBG_VALUE instructions.

When the register allocator is moving values between registers and the stack, it
is very hard to keep track of DBG_VALUE instructions. We usually get it wrong.
This analysis maintains a data structure that makes it easy to update DBG_VALUE
instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120385 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-11-30 02:17:10 +00:00
parent d7b6a989a7
commit bb7b23f5b7
5 changed files with 110 additions and 0 deletions
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lib/CodeGen/CodeGen.cpp
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@ -23,6 +23,7 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
initializeDeadMachineInstructionElimPass(Registry);
initializeGCModuleInfoPass(Registry);
initializeIfConverterPass(Registry);
initializeLiveDebugVariablesPass(Registry);
initializeLiveIntervalsPass(Registry);
initializeLiveStacksPass(Registry);
initializeLiveVariablesPass(Registry);