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Implement the first half of LiveDebugVariables.

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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
This commit is contained in:
Jakob Stoklund Olesen
2010-12-02 00:37:37 +00:00
parent dff84b0325
commit 0613516b16
5 changed files with 529 additions and 6 deletions
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4
lib/CodeGen/LiveDebugVariables.h
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@@ -31,6 +31,7 @@ public:
static char ID; // Pass identification, replacement for typeid
LiveDebugVariables();
~LiveDebugVariables();
/// renameRegister - Move any user variables in OldReg to NewReg:SubIdx.
/// @param OldReg Old virtual register that is going away.
@@ -45,9 +46,8 @@ public:
private:
/// runOnMachineFunction - Analyze and remove DBG_VALUE instructions.
virtual bool runOnMachineFunction(MachineFunction &);
virtual void releaseMemory();
virtual void getAnalysisUsage(AnalysisUsage &) const;
};