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LLVM backend for 6502
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0613516b16
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Jakob Stoklund Olesen 0613516b16 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
2010-12-02 00:37:37 +00:00
autoconf
bindings
cmake
docs forbid rtti and exceptions 2010-11-30 19:20:40 +00:00
examples
include Implement the first half of LiveDebugVariables. 2010-12-02 00:37:37 +00:00
lib Implement the first half of LiveDebugVariables. 2010-12-02 00:37:37 +00:00
projects
runtime
test Fix and re-enable tail call optimization of expanded libcalls. 2010-12-01 22:59:46 +00:00
tools Add hiddent command line option, as an debugging aid, to disable .loc use. 2010-12-01 15:36:49 +00:00
unittests Make valgrind happy. 2010-12-01 22:28:42 +00:00
utils Avoid "char" for Neon vector elements; make it explicitly signed (or unsigned). 2010-12-02 00:24:59 +00:00
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