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[sil] Add a new API ValueBase::getSingleUser()

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This API returns nullptr if the ValueBase has more than one user and an
Operand * otherwise.
This commit is contained in:
Michael Gottesman
2017-04-02 00:51:16 -07:00
parent 6ade74a809
commit 00bcd15765
1 changed files with 13 additions and 1 deletions
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14
include/swift/SIL/SILValue.h
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@@ -174,6 +174,7 @@ public:
bool use_empty() const { return FirstUse == nullptr; }
using use_iterator = ValueBaseUseIterator;
using use_range = iterator_range<use_iterator>;
inline use_iterator use_begin() const;
inline use_iterator use_end() const;
@@ -181,13 +182,17 @@ public:
/// Returns a range of all uses, which is useful for iterating over all uses.
/// To ignore debug-info instructions use swift::getNonDebugUses instead
/// (see comment in DebugUtils.h).
inline iterator_range<use_iterator> getUses() const;
inline use_range getUses() const;
/// Returns true if this value has exactly one use.
/// To ignore debug-info instructions use swift::hasOneNonDebugUse instead
/// (see comment in DebugUtils.h).
inline bool hasOneUse() const;
/// Returns .some(single user) if this value has a single user. Returns .none
/// otherwise.
inline Operand *getSingleUse() const;
/// Pretty-print the value.
void dump() const;
void print(raw_ostream &OS) const;
@@ -499,6 +504,13 @@ inline bool ValueBase::hasOneUse() const {
if (I == E) return false;
return ++I == E;
}
inline Operand *ValueBase::getSingleUse() const {
auto I = use_begin(), E = use_end();
if (I == E) return nullptr;
++I;
if (I != E) return nullptr;
return *I;
}
/// A constant-size list of the operands of an instruction.
template <unsigned N> class FixedOperandList {