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//===- GlobalCombinerEmitter.cpp - Generate a combiner --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file Generate a combiner implementation for GlobalISel from a declarative
/// syntax
///
//===----------------------------------------------------------------------===//
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Timer.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/TableGenBackend.h"
#include "CodeGenTarget.h"
using namespace llvm;
#define DEBUG_TYPE "gicombiner-emitter"
cl::OptionCategory
GICombinerEmitterCat("Options for -gen-global-isel-combiner");
static cl::list<std::string>
SelectedCombiners("combiners", cl::desc("Emit the specified combiners"),
cl::cat(GICombinerEmitterCat), cl::CommaSeparated);
static cl::opt<bool> ShowExpansions(
"gicombiner-show-expansions",
cl::desc("Use C++ comments to indicate occurence of code expansion"),
cl::cat(GICombinerEmitterCat));
namespace {
class GICombinerEmitter {
StringRef Name;
Record *Combiner;
public:
explicit GICombinerEmitter(RecordKeeper &RK, StringRef Name,
Record *Combiner);
~GICombinerEmitter() {}
StringRef getClassName() const {
return Combiner->getValueAsString("Classname");
}
void run(raw_ostream &OS);
};
GICombinerEmitter::GICombinerEmitter(RecordKeeper &RK, StringRef Name,
Record *Combiner)
: Name(Name), Combiner(Combiner) {}
void GICombinerEmitter::run(raw_ostream &OS) {
NamedRegionTimer T("Emit", "Time spent emitting the combiner",
"Code Generation", "Time spent generating code",
TimeRegions);
OS << "#ifdef " << Name.upper() << "_GENCOMBINERHELPER_DEPS\n"
<< "#endif // ifdef " << Name.upper() << "_GENCOMBINERHELPER_DEPS\n\n";
OS << "#ifdef " << Name.upper() << "_GENCOMBINERHELPER_H\n"
<< "class " << getClassName() << " {\n"
<< "public:\n"
<< " bool tryCombineAll(\n"
<< " GISelChangeObserver &Observer,\n"
<< " MachineInstr &MI,\n"
<< " MachineIRBuilder &B) const;\n"
<< "};\n";
OS << "#endif // ifdef " << Name.upper() << "_GENCOMBINERHELPER_H\n\n";
OS << "#ifdef " << Name.upper() << "_GENCOMBINERHELPER_CPP\n"
<< "\n"
<< "bool " << getClassName() << "::tryCombineAll(\n"
<< " GISelChangeObserver &Observer,\n"
<< " MachineInstr &MI,\n"
<< " MachineIRBuilder &B) const {\n"
<< " MachineBasicBlock *MBB = MI.getParent();\n"
<< " MachineFunction *MF = MBB->getParent();\n"
<< " MachineRegisterInfo &MRI = MF->getRegInfo();\n"
<< " (void)MBB; (void)MF; (void)MRI;\n\n";
OS << "\n return false;\n"
<< "}\n"
<< "#endif // ifdef " << Name.upper() << "_GENCOMBINERHELPER_CPP\n";
}
} // end anonymous namespace
//===----------------------------------------------------------------------===//
namespace llvm {
void EmitGICombiner(RecordKeeper &RK, raw_ostream &OS) {
CodeGenTarget Target(RK);
emitSourceFileHeader("Global Combiner", OS);
if (SelectedCombiners.empty())
PrintFatalError("No combiners selected with -combiners");
for (const auto &Combiner : SelectedCombiners) {
Record *CombinerDef = RK.getDef(Combiner);
if (!CombinerDef)
PrintFatalError("Could not find " + Combiner);
GICombinerEmitter(RK, Combiner, CombinerDef).run(OS);
}
}
} // namespace llvm
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