DebugLabelFolder ruthlessly deletes redundant labels. However, sometimes the redundant labels is referenced by debug info somewhere else. This patch provies a way so that dwarf writer can mark labels as used.
llvm-svn: 68813
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6764593098
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@ -37,6 +37,7 @@
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/UniqueVector.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/CodeGen/MachineLocation.h"
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#include "llvm/GlobalValue.h"
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@ -115,6 +116,9 @@ private:
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// searchable format.
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SmallPtrSet<const Function *, 32> UsedFunctions;
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/// UsedDbgLabels - labels are used by debug info entries.
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SmallSet<unsigned, 8> UsedDbgLabels;
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bool CallsEHReturn;
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bool CallsUnwindInit;
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@ -195,6 +199,19 @@ public:
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return LabelID ? LabelIDList[LabelID - 1] : 0;
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}
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/// isDbgLabelUsed - Return true if label with LabelID is used by
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/// DwarfWriter.
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bool isDbgLabelUsed(unsigned LabelID) {
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return UsedDbgLabels.count(LabelID);
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}
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/// RecordUsedDbgLabel - Mark label with LabelID as used. This is used
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/// by DwarfWriter to inform DebugLabelFolder that certain labels are
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/// not to be deleted.
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void RecordUsedDbgLabel(unsigned LabelID) {
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UsedDbgLabels.insert(LabelID);
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}
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/// getFrameMoves - Returns a reference to a list of moves done in the current
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/// function's prologue. Used to construct frame maps for debug and exception
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/// handling comsumers.
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@ -333,7 +333,7 @@ bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
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// Iterate through instructions.
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for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
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// Is it a label.
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if (I->isDebugLabel()) {
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if (I->isDebugLabel() && !MMI->isDbgLabelUsed(I->getOperand(0).getImm())){
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// The label ID # is always operand #0, an immediate.
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unsigned NextLabel = I->getOperand(0).getImm();
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