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Remove the nasty LABEL hack with a much less evil one. Now llvm.dbg.func.start implies a stoppoint is set. SelectionDAGISel records a new source line but does not create a ISD::LABEL node for this special stoppoint. Asm printer will magically print this label. This ensures nothing is emitted before.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46635 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-01 09:10:45 +00:00
parent a647c92ec2
commit 1b08bbca55
8 changed files with 29 additions and 59 deletions
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23
lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
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@ -711,28 +711,7 @@ void ScheduleDAG::EmitNode(SDNode *Node, unsigned InstanceNo,
}
}
// Now that we have emitted all operands, emit this instruction itself.
if (ISD::isDebugLabel(Node) &&
!BB->empty() && &MF->front() == BB) {
// If we are inserting a debug label and this happens to be the first
// debug label in the entry block, it is the "function start" label.
// Make sure there are no other instructions before it.
unsigned NumLabels = 0;
MachineBasicBlock::iterator MBBI = BB->begin();
while (MBBI != BB->end()) {
// FIXME: This is a nasty short term workaround. For now, we are
// assuming there are two debug labels at the beginning of the
// entry block: one for dbg_func_start, one for the first
// dbg_stoppoint before actual code.
if (!MBBI->isDebugLabel() || ++NumLabels > 1)
break;
++MBBI;
}
if (NumLabels <= 1)
BB->insert(BB->begin(), MI);
else
BB->push_back(MI);
} else if (II.usesCustomDAGSchedInsertionHook())
if (II.usesCustomDAGSchedInsertionHook())
// Insert this instruction into the basic block using a target
// specific inserter which may returns a new basic block.
BB = DAG.getTargetLoweringInfo().EmitInstrWithCustomInserter(MI, BB);