ca29c271d2
Adds fatal errors for any target that does not support the Tiny or Kernel codemodels by rejigging the getEffectiveCodeModel calls. Differential Revision: https://reviews.llvm.org/D50141 llvm-svn: 348585
118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
//===-- BPFTargetMachine.cpp - Define TargetMachine for BPF ---------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Implements the info about BPF target spec.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "BPFTargetMachine.h"
|
|
#include "BPF.h"
|
|
#include "MCTargetDesc/BPFMCAsmInfo.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
|
|
#include "llvm/CodeGen/TargetPassConfig.h"
|
|
#include "llvm/IR/LegacyPassManager.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
using namespace llvm;
|
|
|
|
static cl::
|
|
opt<bool> DisableMIPeephole("disable-bpf-peephole", cl::Hidden,
|
|
cl::desc("Disable machine peepholes for BPF"));
|
|
|
|
extern "C" void LLVMInitializeBPFTarget() {
|
|
// Register the target.
|
|
RegisterTargetMachine<BPFTargetMachine> X(getTheBPFleTarget());
|
|
RegisterTargetMachine<BPFTargetMachine> Y(getTheBPFbeTarget());
|
|
RegisterTargetMachine<BPFTargetMachine> Z(getTheBPFTarget());
|
|
|
|
PassRegistry &PR = *PassRegistry::getPassRegistry();
|
|
initializeBPFMIPeepholePass(PR);
|
|
}
|
|
|
|
// DataLayout: little or big endian
|
|
static std::string computeDataLayout(const Triple &TT) {
|
|
if (TT.getArch() == Triple::bpfeb)
|
|
return "E-m:e-p:64:64-i64:64-n32:64-S128";
|
|
else
|
|
return "e-m:e-p:64:64-i64:64-n32:64-S128";
|
|
}
|
|
|
|
static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
|
|
if (!RM.hasValue())
|
|
return Reloc::PIC_;
|
|
return *RM;
|
|
}
|
|
|
|
BPFTargetMachine::BPFTargetMachine(const Target &T, const Triple &TT,
|
|
StringRef CPU, StringRef FS,
|
|
const TargetOptions &Options,
|
|
Optional<Reloc::Model> RM,
|
|
Optional<CodeModel::Model> CM,
|
|
CodeGenOpt::Level OL, bool JIT)
|
|
: LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
|
|
getEffectiveRelocModel(RM),
|
|
getEffectiveCodeModel(CM, CodeModel::Small), OL),
|
|
TLOF(make_unique<TargetLoweringObjectFileELF>()),
|
|
Subtarget(TT, CPU, FS, *this) {
|
|
initAsmInfo();
|
|
|
|
BPFMCAsmInfo *MAI =
|
|
static_cast<BPFMCAsmInfo *>(const_cast<MCAsmInfo *>(AsmInfo.get()));
|
|
MAI->setDwarfUsesRelocationsAcrossSections(!Subtarget.getUseDwarfRIS());
|
|
}
|
|
namespace {
|
|
// BPF Code Generator Pass Configuration Options.
|
|
class BPFPassConfig : public TargetPassConfig {
|
|
public:
|
|
BPFPassConfig(BPFTargetMachine &TM, PassManagerBase &PM)
|
|
: TargetPassConfig(TM, PM) {}
|
|
|
|
BPFTargetMachine &getBPFTargetMachine() const {
|
|
return getTM<BPFTargetMachine>();
|
|
}
|
|
|
|
bool addInstSelector() override;
|
|
void addMachineSSAOptimization() override;
|
|
void addPreEmitPass() override;
|
|
};
|
|
}
|
|
|
|
TargetPassConfig *BPFTargetMachine::createPassConfig(PassManagerBase &PM) {
|
|
return new BPFPassConfig(*this, PM);
|
|
}
|
|
|
|
// Install an instruction selector pass using
|
|
// the ISelDag to gen BPF code.
|
|
bool BPFPassConfig::addInstSelector() {
|
|
addPass(createBPFISelDag(getBPFTargetMachine()));
|
|
|
|
return false;
|
|
}
|
|
|
|
void BPFPassConfig::addMachineSSAOptimization() {
|
|
// The default implementation must be called first as we want eBPF
|
|
// Peephole ran at last.
|
|
TargetPassConfig::addMachineSSAOptimization();
|
|
|
|
const BPFSubtarget *Subtarget = getBPFTargetMachine().getSubtargetImpl();
|
|
if (Subtarget->getHasAlu32() && !DisableMIPeephole)
|
|
addPass(createBPFMIPeepholePass());
|
|
}
|
|
|
|
void BPFPassConfig::addPreEmitPass() {
|
|
const BPFSubtarget *Subtarget = getBPFTargetMachine().getSubtargetImpl();
|
|
|
|
addPass(createBPFMIPreEmitCheckingPass());
|
|
if (getOptLevel() != CodeGenOpt::None)
|
|
if (Subtarget->getHasAlu32() && !DisableMIPeephole)
|
|
addPass(createBPFMIPreEmitPeepholePass());
|
|
}
|