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When XDEBUG is enabled, check for SelectionDAG cycles at some key

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points.  This will help us find future problems like the one
described in PR6019.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94019 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene
2010-01-20 20:13:31 +00:00
parent 1bc76d48d4
commit cf495bc2e5
4 changed files with 54 additions and 2 deletions
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8
include/llvm/CodeGen/SelectionDAGNodes.h
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@ -44,6 +44,8 @@ template <typename T> struct DenseMapInfo;
template <typename T> struct simplify_type;
template <typename T> struct ilist_traits;
void checkForCycles(const SDNode *N);
/// SDVTList - This represents a list of ValueType's that has been intern'd by
/// a SelectionDAG. Instances of this simple value class are returned by
/// SelectionDAG::getVTList(...).
@ -1363,6 +1365,7 @@ protected:
OperandList[i].setUser(this);
OperandList[i].setInitial(Ops[i]);
}
checkForCycles(this);
}
/// This constructor adds no operands itself; operands can be
@ -1379,6 +1382,7 @@ protected:
Ops[0].setInitial(Op0);
NumOperands = 1;
OperandList = Ops;
checkForCycles(this);
}
/// InitOperands - Initialize the operands list of this with 2 operands.
@ -1389,6 +1393,7 @@ protected:
Ops[1].setInitial(Op1);
NumOperands = 2;
OperandList = Ops;
checkForCycles(this);
}
/// InitOperands - Initialize the operands list of this with 3 operands.
@ -1402,6 +1407,7 @@ protected:
Ops[2].setInitial(Op2);
NumOperands = 3;
OperandList = Ops;
checkForCycles(this);
}
/// InitOperands - Initialize the operands list of this with 4 operands.
@ -1417,6 +1423,7 @@ protected:
Ops[3].setInitial(Op3);
NumOperands = 4;
OperandList = Ops;
checkForCycles(this);
}
/// InitOperands - Initialize the operands list of this with N operands.
@ -1427,6 +1434,7 @@ protected:
}
NumOperands = N;
OperandList = Ops;
checkForCycles(this);
}
/// DropOperands - Release the operands and set this node to have