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PR7952: Make isa<> use the same logic as cast<>, so that they both work

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consistently.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131803 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-05-21 19:13:10 +00:00
parent b22da2a72c
commit 21c60904ce
2 changed files with 45 additions and 53 deletions
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96
include/llvm/Support/Casting.h
View File

@ -23,8 +23,6 @@ namespace llvm {
// isa<x> Support Templates
//===----------------------------------------------------------------------===//
template<typename FromCl> struct isa_impl_cl;
// Define a template that can be specialized by smart pointers to reflect the
// fact that they are automatically dereferenced, and are not involved with the
// template selection process... the default implementation is a noop.
@ -43,12 +41,9 @@ template<typename From> struct simplify_type<const From> {
}
};
// isa<X> - Return true if the parameter to the template is an instance of the
// template type argument. Used like this:
//
// if (isa<Type*>(myVal)) { ... }
//
// The core of the implementation of isa<X> is here; To and From should be
// the names of classes. This template can be specialized to customize the
// implementation of isa<> without rewriting it from scratch.
template <typename To, typename From>
struct isa_impl {
static inline bool doit(const From &Val) {
@ -56,66 +51,63 @@ struct isa_impl {
}
};
template<typename To, typename From, typename SimpleType>
template <typename To, typename From> struct isa_impl_cl {
static inline bool doit(const From &Val) {
return isa_impl<To, From>::doit(Val);
}
};
template <typename To, typename From> struct isa_impl_cl<To, const From> {
static inline bool doit(const From &Val) {
return isa_impl<To, From>::doit(Val);
}
};
template <typename To, typename From> struct isa_impl_cl<To, From*> {
static inline bool doit(const From *Val) {
return isa_impl<To, From>::doit(*Val);
}
};
template <typename To, typename From> struct isa_impl_cl<To, const From*> {
static inline bool doit(const From *Val) {
return isa_impl<To, From>::doit(*Val);
}
};
template <typename To, typename From> struct isa_impl_cl<To, const From*const> {
static inline bool doit(const From *Val) {
return isa_impl<To, From>::doit(*Val);
}
};
template<typename To, typename From, typename SimpleFrom>
struct isa_impl_wrap {
// When From != SimplifiedType, we can simplify the type some more by using
// the simplify_type template.
static bool doit(const From &Val) {
return isa_impl_cl<const SimpleType>::template
isa<To>(simplify_type<const From>::getSimplifiedValue(Val));
return isa_impl_wrap<To, SimpleFrom,
typename simplify_type<SimpleFrom>::SimpleType>::doit(
simplify_type<From>::getSimplifiedValue(Val));
}
};
template<typename To, typename FromTy>
struct isa_impl_wrap<To, const FromTy, const FromTy> {
struct isa_impl_wrap<To, FromTy, FromTy> {
// When From == SimpleType, we are as simple as we are going to get.
static bool doit(const FromTy &Val) {
return isa_impl<To,FromTy>::doit(Val);
return isa_impl_cl<To,FromTy>::doit(Val);
}
};
// isa_impl_cl - Use class partial specialization to transform types to a single
// canonical form for isa_impl.
// isa<X> - Return true if the parameter to the template is an instance of the
// template type argument. Used like this:
//
// if (isa<Type>(myVal)) { ... }
//
template<typename FromCl>
struct isa_impl_cl {
template<class ToCl>
static bool isa(const FromCl &Val) {
return isa_impl_wrap<ToCl,const FromCl,
typename simplify_type<const FromCl>::SimpleType>::doit(Val);
}
};
// Specialization used to strip const qualifiers off of the FromCl type...
template<typename FromCl>
struct isa_impl_cl<const FromCl> {
template<class ToCl>
static bool isa(const FromCl &Val) {
return isa_impl_cl<FromCl>::template isa<ToCl>(Val);
}
};
// Define pointer traits in terms of base traits...
template<class FromCl>
struct isa_impl_cl<FromCl*> {
template<class ToCl>
static bool isa(FromCl *Val) {
return isa_impl_cl<FromCl>::template isa<ToCl>(*Val);
}
};
// Define reference traits in terms of base traits...
template<class FromCl>
struct isa_impl_cl<FromCl&> {
template<class ToCl>
static bool isa(FromCl &Val) {
return isa_impl_cl<FromCl>::template isa<ToCl>(&Val);
}
};
template <class X, class Y>
inline bool isa(const Y &Val) {
return isa_impl_cl<Y>::template isa<X>(Val);
return isa_impl_wrap<X, Y, typename simplify_type<Y>::SimpleType>::doit(Val);
}
//===----------------------------------------------------------------------===//

2
lib/Transforms/Scalar/SCCP.cpp
View File

@ -655,7 +655,7 @@ bool SCCPSolver::isEdgeFeasible(BasicBlock *From, BasicBlock *To) {
// Just mark all destinations executable!
// TODO: This could be improved if the operand is a [cast of a] BlockAddress.
if (isa<IndirectBrInst>(&TI))
if (isa<IndirectBrInst>(TI))
return true;
#ifndef NDEBUG