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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-12-02 00:37:37 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-12-02 00:37:37 +0000 |
| commit | 4be0bd79a472f01c2310507df3150ecf3b57c88f (patch) | |
| tree | abbfd7e638c4b318cbcb8410a168ce9a9e91de68 /clang/lib/Basic/FileSystemStatCache.cpp | |
| parent | ce2bd8d05f40f8269c975e28b1e743d75708ea98 (diff) | |
| download | llvm-4be0bd79a472f01c2310507df3150ecf3b57c88f.zip llvm-4be0bd79a472f01c2310507df3150ecf3b57c88f.tar.gz llvm-4be0bd79a472f01c2310507df3150ecf3b57c88f.tar.bz2 | |
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.
llvm-svn: 120636
Diffstat (limited to 'clang/lib/Basic/FileSystemStatCache.cpp')
0 files changed, 0 insertions, 0 deletions