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[sil] Add SILArgument::getSingleTerminator() helper. #29601

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Merged
merged 1 commit into from
Feb 2, 2020
Merged

[sil] Add SILArgument::getSingleTerminator() helper. #29601

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18 changes: 18 additions & 0 deletions include/swift/SIL/SILArgument.h
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,10 @@ class SILArgument : public ValueBase {
/// is the enum itself (the operand of the switch_enum).
SILValue getSingleTerminatorOperand() const;

/// If this SILArgument's parent block has a single predecessor whose
/// terminator has a single operand, return that terminator.
TermInst *getSingleTerminator() const;

/// Return the SILArgumentKind of this argument.
SILArgumentKind getKind() const {
return SILArgumentKind(ValueBase::getKind());
Expand Down Expand Up @@ -264,6 +268,10 @@ class SILPhiArgument : public SILArgument {
/// is the enum itself (the operand of the switch_enum).
SILValue getSingleTerminatorOperand() const;

/// If this SILArgument's parent block has a single predecessor whose
/// terminator has a single operand, return that terminator.
TermInst *getSingleTerminator() const;

static bool classof(const SILInstruction *) = delete;
static bool classof(const SILUndef *) = delete;
static bool classof(const SILNode *node) {
Expand Down Expand Up @@ -403,6 +411,16 @@ inline bool SILArgument::getSingleTerminatorOperands(
llvm_unreachable("Covered switch is not covered?!");
}

inline TermInst *SILArgument::getSingleTerminator() const {
switch (getKind()) {
case SILArgumentKind::SILPhiArgument:
return cast<SILPhiArgument>(this)->getSingleTerminator();
case SILArgumentKind::SILFunctionArgument:
return nullptr;
}
llvm_unreachable("Covered switch is not covered?!");
}

} // end swift namespace

#endif
8 changes: 8 additions & 0 deletions lib/SIL/SILArgument.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -235,6 +235,14 @@ SILValue SILPhiArgument::getSingleTerminatorOperand() const {
return getSingleTerminatorOperandForPred(parentBlock, predBlock, getIndex());
}

TermInst *SILPhiArgument::getSingleTerminator() const {
auto *parentBlock = getParent();
auto *predBlock = parentBlock->getSinglePredecessorBlock();
if (!predBlock)
return nullptr;
return const_cast<SILBasicBlock *>(predBlock)->getTerminator();
}

const SILPhiArgument *BranchInst::getArgForOperand(const Operand *oper) const {
assert(oper->getUser() == this);
return cast<SILPhiArgument>(
Expand Down