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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-12-02 00:37:37 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-12-02 00:37:37 +0000 |
| commit | 0613516b16466a92c68d60734801221506c85e86 (patch) | |
| tree | 5b29564569f13d977b7c2aa4c58914af83259737 /lib/MC/ELFObjectWriter.cpp | |
| parent | dff84b03258514463ede477af38f1246b95b0cd0 (diff) | |
Implement the first half of LiveDebugVariables.
Scan the MachineFunction for DBG_VALUE instructions, and replace them with a
data structure similar to LiveIntervals. The live range of a DBG_VALUE is
determined by propagating it down the dominator tree until a new DBG_VALUE is
found. When a DBG_VALUE lives in a register, its live range is confined to the
live range of the register's value.
LiveDebugVariables runs before coalescing, so DBG_VALUEs are not artificially
extended when registers are joined.
The missing half will recreate DBG_VALUE instructions from the intervals when
register allocation is complete.
The pass is disabled by default. It can be enabled with the temporary command
line option -live-debug-variables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120636 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/MC/ELFObjectWriter.cpp')
0 files changed, 0 insertions, 0 deletions