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compiler: implement Go 1 unsafe.Pointer conversion rules 

Any type whose underlying type is uintptr can be converted
to unsafe.Pointer, and vice versa.

Fixes golang/go#10284.

From-SVN: r221774
This commit is contained in:
Ian Lance Taylor 2015-03-30 17:32:06 +00:00
parent 233b9db6fb
commit c40b69ae69
1 changed files with 3 additions and 3 deletions
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6
gcc/go/gofrontend/types.cc
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@ -772,16 +772,16 @@ Type::are_convertible(const Type* lhs, const Type* rhs, std::string* reason)
}
// An unsafe.Pointer type may be converted to any pointer type or to
// uintptr, and vice-versa.
// a type whose underlying type is uintptr, and vice-versa.
if (lhs->is_unsafe_pointer_type()
&& (rhs->points_to() != NULL
|| (rhs->integer_type() != NULL
&& rhs->forwarded() == Type::lookup_integer_type("uintptr"))))
&& rhs->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
return true;
if (rhs->is_unsafe_pointer_type()
&& (lhs->points_to() != NULL
|| (lhs->integer_type() != NULL
&& lhs->forwarded() == Type::lookup_integer_type("uintptr"))))
&& lhs->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
return true;
// Give a better error message.