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[TableGen] Change backend callback to require const RecordKeeper (#111064)

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Change TableGen backend callback function to require a const
RecordKeeper argument (by changing it from function_ref to just a
function pointer). This undoes parts of
https://github.com/llvm/llvm-project/pull/104716 which was added to
enable gradual migration of TableGen backends to use const RecordKeeper
(by allowing either const or non-const references). Now that all
backends have been migrated to const reference, we do not need this.

This is a part of effort to have better const correctness in TableGen
backends:


https://discourse.llvm.org/t/psa-planned-changes-to-tablegen-getallderiveddefinitions-api-potential-downstream-breakages/81089
This commit is contained in:
Rahul Joshi 2024-10-04 09:24:48 -07:00 committed by GitHub
parent d883ef1076
commit b91f0def6f
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 6 additions and 5 deletions
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9
llvm/include/llvm/TableGen/TableGenBackend.h
View File

@ -23,8 +23,7 @@ class RecordKeeper;
class raw_ostream;
namespace TableGen::Emitter {
// Supports const and non-const forms of callback functions.
using FnT = function_ref<void(RecordKeeper &Records, raw_ostream &OS)>;
using FnT = function_ref<void(const RecordKeeper &Records, raw_ostream &OS)>;
/// Creating an `Opt` object registers the command line option \p Name with
/// TableGen backend and associates the callback \p CB with that option. If
@ -37,7 +36,9 @@ struct Opt {
/// Convienence wrapper around `Opt` that registers `EmitterClass::run` as the
/// callback.
template <class EmitterC> class OptClass : Opt {
static void run(RecordKeeper &RK, raw_ostream &OS) { EmitterC(RK).run(OS); }
static void run(const RecordKeeper &RK, raw_ostream &OS) {
EmitterC(RK).run(OS);
}
public:
OptClass(StringRef Name, StringRef Desc) : Opt(Name, run, Desc) {}
@ -45,7 +46,7 @@ public:
/// Apply callback for any command line option registered above. Returns false
/// is no callback was applied.
bool ApplyCallback(RecordKeeper &Records, raw_ostream &OS);
bool ApplyCallback(const RecordKeeper &Records, raw_ostream &OS);
} // namespace TableGen::Emitter

2
llvm/lib/TableGen/TableGenBackend.cpp
View File

@ -60,7 +60,7 @@ Opt::Opt(StringRef Name, FnT CB, StringRef Desc, bool ByDefault) {
/// Apply callback specified on the command line. Returns true if no callback
/// was applied.
bool llvm::TableGen::Emitter::ApplyCallback(RecordKeeper &Records,
bool llvm::TableGen::Emitter::ApplyCallback(const RecordKeeper &Records,
raw_ostream &OS) {
FnT Fn = CallbackFunction->getValue();
if (!Fn)