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add a helper class

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23633 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-10-05 06:34:34 +00:00
parent 5c46f74ec7
commit d623e953fc
1 changed files with 17 additions and 0 deletions
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17
include/llvm/CodeGen/SelectionDAGNodes.h
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@ -309,6 +309,9 @@ namespace ISD {
// other operands match the intrinsic. These produce a token chain in
// addition to a value (if any).
READPORT, WRITEPORT, READIO, WRITEIO,
// HANDLENODE node - Used as a handle for various purposes.
HANDLENODE,
// BUILTIN_OP_END - This must be the last enum value in this list.
BUILTIN_OP_END,
@ -751,6 +754,20 @@ inline bool SDOperand::hasOneUse() const {
return Val->hasNUsesOfValue(1, ResNo);
}
/// HandleSDNode - This class is used to form a handle around another node that
/// is persistant and is updated across invocations of replaceAllUsesWith on its
/// operand. This node should be directly created by end-users and not added to
/// the AllNodes list.
class HandleSDNode : public SDNode {
public:
HandleSDNode(SDOperand X) : SDNode(ISD::HANDLENODE, X) {}
~HandleSDNode() {
MorphNodeTo(ISD::HANDLENODE); // Drops operand uses.
}
SDOperand getValue() const { return getOperand(0); }
};
class ConstantSDNode : public SDNode {
uint64_t Value;