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Add simplify_type specializations to allow WeakVH, AssertingVH, and

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CallbackVH to participate in dyn_cast, isa, etc. without needing
an explicit conversion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71087 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-05-06 17:12:48 +00:00
parent 5dcf50bd03
commit 0ec4146db7
1 changed files with 37 additions and 2 deletions
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39
include/llvm/Support/ValueHandle.h
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@ -126,8 +126,19 @@ public:
operator Value*() const {
return getValPtr();
}
};
};
// Specialize simplify_type to allow WeakVH to participate in
// dyn_cast, isa, etc.
template<typename From> struct simplify_type;
template<> struct simplify_type<const WeakVH> {
typedef Value* SimpleType;
static SimpleType getSimplifiedValue(const WeakVH &WVH) {
return static_cast<Value *>(WVH);
}
};
template<> struct simplify_type<WeakVH> : public simplify_type<const WeakVH> {};
/// AssertingVH - This is a Value Handle that points to a value and asserts out
/// if the value is destroyed while the handle is still live. This is very
/// useful for catching dangling pointer bugs and other things which can be
@ -188,6 +199,18 @@ public:
ValueTy &operator*() const { return *getValPtr(); }
};
// Specialize simplify_type to allow AssertingVH to participate in
// dyn_cast, isa, etc.
template<typename From> struct simplify_type;
template<> struct simplify_type<const AssertingVH<Value> > {
typedef Value* SimpleType;
static SimpleType getSimplifiedValue(const AssertingVH<Value> &AVH) {
return static_cast<Value *>(AVH);
}
};
template<> struct simplify_type<AssertingVH<Value> >
: public simplify_type<const AssertingVH<Value> > {};
/// CallbackVH - This is a value handle that allows subclasses to define
/// callbacks that run when the underlying Value has RAUW called on it or is
/// destroyed. This class can be used as the key of a map, as long as the user
@ -232,6 +255,18 @@ public:
virtual void allUsesReplacedWith(Value *new_value) {}
};
// Specialize simplify_type to allow CallbackVH to participate in
// dyn_cast, isa, etc.
template<typename From> struct simplify_type;
template<> struct simplify_type<const CallbackVH> {
typedef Value* SimpleType;
static SimpleType getSimplifiedValue(const CallbackVH &CVH) {
return static_cast<Value *>(CVH);
}
};
template<> struct simplify_type<CallbackVH>
: public simplify_type<const CallbackVH> {};
} // End llvm namespace
#endif