Use reflect_invoke metafunction to invoke a member function
#79
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Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
…and overloadd Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
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Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
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I've added everything that I wanted, for now. |
libcxx/test/std/experimental/reflection/reflect-invoke.pass.cpp
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| //===----------------------------------------------------------------------===// | |||
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Great idea to add these!!
We desperately need more of these "fail-tests" for reflection (I haven't written any) - after you're finishing with this PR, if you have any interest in adding some, that'd be a huge help.
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I don't mind to work on it!
It would be helpful for me if you could elaborate what testing would be useful for authors of paper and users of this fork.
Should it be only different tests to trigger diagnostic messages or I also need to try to cover some branches where we just say that expression is invalid (return true;)?
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Both would be great - we don't need full coverage of "expression is invalid" cases for every function, but a few would be nice.
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I see, will do after this PR 👍🏻
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
…onstexpr function Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
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@katzdm ready for the next iteration of review, when you have time |
clang/lib/Sema/Metafunctions.cpp
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| if (auto *MD = dyn_cast<CXXMethodDecl>(VD)) { | ||
| // method declaration | ||
| return MD; | ||
| } else { | ||
| // pointer to non-static method | ||
| // validation was done in is_nonstatic_member_function | ||
| auto *VarD = cast<VarDecl>(VD); | ||
| if (!VarD->isConstexpr()) { | ||
| // avoid extracting constexpr method declaration | ||
| // from non-constexpr function pointers | ||
| return nullptr; | ||
| } | ||
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| Expr *Init = VarD->getInit(); | ||
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| if (auto *UnaryOp = dyn_cast<UnaryOperator>(Init)) { | ||
| // get the operand of & | ||
| Init = UnaryOp->getSubExpr(); | ||
| } | ||
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| while (auto *CastExpr = dyn_cast<ImplicitCastExpr>(Init)) { | ||
| // handle ImplicitCastExpr if it is wrapping the actual expression | ||
| Init = CastExpr->getSubExpr(); | ||
| } | ||
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| if (auto *DREFromUnary = dyn_cast<DeclRefExpr>(Init)) { | ||
| return dyn_cast<CXXMethodDecl>(DREFromUnary->getDecl()); | ||
| } | ||
| } | ||
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| // if we reach this point | ||
| // then probably there is a bug in `is_nonstatic_member_function` | ||
| // or we failed to extract method from pointer | ||
| llvm_unreachable("failed to get member function from decl ref expression"); | ||
| } |
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I'm not sure that introspecting the substructure of the DeclRefExpr is the best approach here. We could instead evaluate it as a prvalue, obtain an APValue, and pull the CXXMethodDecl out of there.
One of the kinds that an APValue might be is MemberPointer, for which it looks like you can use this method to get the ValueDecl. Maybe we can just check if that ValueDecl is a CXXMethodDecl, and return that?
Feel free to ping me if more detail would help.
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Done. Let me know if it looks similar to what you expected
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Signed-off-by: Valentyn Yukhymenko <valentin.yukhymenko@gmail.com>
Issue number of the reported bug or feature request: #5
Describe your changes
Added support for calling non-static member functions via
reflect_invokeif first provided argument is a reflection of a related object.Testing performed
Additional context
N/A