yihanaa added inline comments.
================
Comment at: clang/lib/Sema/SemaChecking.cpp:7671
+ AllArgs, CallType))
+ return true;
+
----------------
rjmccall wrote:
> yihanaa wrote:
> > rjmccall wrote:
> > > yihanaa wrote:
> > > > rjmccall wrote:
> > > > > You can just pull the argument expressions out of the `CallExpr`; you
> > > > > don't need to call `GatherArgumentsForCall`.
> > > > > You can just pull the argument expressions out of the `CallExpr`; you
> > > > > don't need to call `GatherArgumentsForCall`.
> > > >
> > > > This GatherArgumentsForCall was used to do the common sema checking
> > > > and emit warning, like './main.cpp:5:40: warning: passing 'volatile
> > > > char *' to parameter of type 'const void *' discards qualifiers
> > > > [-Wincompatible-pointer-types-discards-qualifiers]' hahaha, for this is
> > > > a common case, I also think GatherArgumentsForCall is not a good choice
> > > > , so I try to find a replacement, e.g. ImpCastExprToType or other ways,
> > > > what do you think about?
> > > `convertArgumentToType` should trigger any useful warnings in the second
> > > and third arguments. For the first, I don't actually think there are any
> > > warnings we care about.
> > I'm sorry John, I can't find `convertArgumentToType ` in clang, did you
> > mean `ConvertArgumentsForCall` or `ImpCastExprToType`. we can't use
> > `ConvertArgumentsForCall `, because `ConvertArgumentsForCall ` has checked
> > if current CallExpr calling a builtin function with custom sema checking,
> > it will do nothing and return.
> Oh, sorry, it's a helper function in Apple's fork that we added for the
> ptrauth builtins but haven't upstreamed yet. Feel free to add it yourself,
> at the top of the file right after `checkArgCount`:
>
> ```
> static bool convertArgumentToType(Sema &S, Expr *&Value, QualType Ty) {
> if (Value->isTypeDependent())
> return false;
>
> InitializedEntity Entity =
> InitializedEntity::InitializeParameter(S.Context, Ty, false);
> ExprResult Result =
> S.PerformCopyInitialization(Entity, SourceLocation(), Value);
> if (Result.isInvalid())
> return true;
> Value = Result.get();
> return false;
> }
> ```
wow,cool! Thanks John
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D131979/new/
https://reviews.llvm.org/D131979
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