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Cleanup the simplify_type implementation.

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As far as simplify_type is concerned, there are 3 kinds of smart pointers:

* const correct: A 'const MyPtr<int> &' produces a 'const int*'. A
'MyPtr<int> &' produces a 'int *'.
* always const: Even a 'MyPtr<int> &' produces a 'const int*'.
* no const: Even a 'const MyPtr<int> &' produces a 'int*'.

This patch then does the following:

* Removes the unused specializations. Since they are unused, it is hard
to know which kind should be implemented.
* Make sure we don't drop const.
* Fix the default forwarding so that const correct pointer only need
one specialization.
* Simplifies the existing specializations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178147 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-03-27 16:43:11 +00:00
parent 00b3b5fbf4
commit 7fe65d691d
9 changed files with 67 additions and 114 deletions
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8
include/llvm/IR/Use.h
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@@ -149,14 +149,14 @@ private:
// casting operators.
template<> struct simplify_type<Use> {
typedef Value* SimpleType;
static SimpleType getSimplifiedValue(const Use &Val) {
return static_cast<SimpleType>(Val.get());
static SimpleType getSimplifiedValue(Use &Val) {
return Val.get();
}
};
template<> struct simplify_type<const Use> {
typedef Value* SimpleType;
typedef /*const*/ Value* SimpleType;
static SimpleType getSimplifiedValue(const Use &Val) {
return static_cast<SimpleType>(Val.get());
return Val.get();
}
};