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Current Path: /usr/src/contrib/llvm-project/llvm/lib/Target/RISCV

usr / src / contrib / llvm-project / llvm / lib / Target / RISCV /

📁 ..
📁 AsmParser
📁 Disassembler
📁 MCTargetDesc
📄 RISCV.h(1.82 KB)
📄 RISCV.td(10.89 KB)
📄 RISCVAsmPrinter.cpp(6.86 KB)
📄 RISCVCallLowering.cpp(1.48 KB)
📄 RISCVCallLowering.h(1.37 KB)
📄 RISCVCallingConv.td(2.27 KB)
📄 RISCVExpandAtomicPseudoInsts.cpp(21.27 KB)
📄 RISCVExpandPseudoInsts.cpp(6.94 KB)
📄 RISCVFrameLowering.cpp(28.44 KB)
📄 RISCVFrameLowering.h(3.1 KB)
📄 RISCVISelDAGToDAG.cpp(22.01 KB)
📄 RISCVISelDAGToDAG.h(2.21 KB)
📄 RISCVISelLowering.cpp(114.94 KB)
📄 RISCVISelLowering.h(10.3 KB)
📄 RISCVInstrFormats.td(10.36 KB)
📄 RISCVInstrFormatsC.td(4.98 KB)
📄 RISCVInstrFormatsV.td(7.57 KB)
📄 RISCVInstrInfo.cpp(26.69 KB)
📄 RISCVInstrInfo.h(5.88 KB)
📄 RISCVInstrInfo.td(45.57 KB)
📄 RISCVInstrInfoA.td(17.37 KB)
📄 RISCVInstrInfoB.td(47.16 KB)
📄 RISCVInstrInfoC.td(33.8 KB)
📄 RISCVInstrInfoD.td(15.36 KB)
📄 RISCVInstrInfoF.td(17.58 KB)
📄 RISCVInstrInfoM.td(4.17 KB)
📄 RISCVInstrInfoV.td(36.31 KB)
📄 RISCVInstructionSelector.cpp(3.18 KB)
📄 RISCVLegalizerInfo.cpp(870 B)
📄 RISCVLegalizerInfo.h(1000 B)
📄 RISCVMCInstLower.cpp(4.3 KB)
📄 RISCVMachineFunctionInfo.h(2.43 KB)
📄 RISCVMergeBaseOffset.cpp(11.06 KB)
📄 RISCVRegisterBankInfo.cpp(1.04 KB)
📄 RISCVRegisterBankInfo.h(1.22 KB)
📄 RISCVRegisterBanks.td(537 B)
📄 RISCVRegisterInfo.cpp(7.31 KB)
📄 RISCVRegisterInfo.h(2.11 KB)
📄 RISCVRegisterInfo.td(12.85 KB)
📄 RISCVSchedRocket32.td(8.04 KB)
📄 RISCVSchedRocket64.td(8.24 KB)
📄 RISCVSchedule.td(7.34 KB)
📄 RISCVSubtarget.cpp(2.63 KB)
📄 RISCVSubtarget.h(5.37 KB)
📄 RISCVSystemOperands.td(11.83 KB)
📄 RISCVTargetMachine.cpp(6.17 KB)
📄 RISCVTargetMachine.h(1.81 KB)
📄 RISCVTargetObjectFile.cpp(4.13 KB)
📄 RISCVTargetObjectFile.h(1.66 KB)
📄 RISCVTargetTransformInfo.cpp(3.06 KB)
📄 RISCVTargetTransformInfo.h(2.02 KB)
📁 TargetInfo
📁 Utils

Editing: RISCVTargetObjectFile.cpp

//===-- RISCVTargetObjectFile.cpp - RISCV Object Info -----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "RISCVTargetObjectFile.h"
#include "RISCVTargetMachine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"

using namespace llvm;

void RISCVELFTargetObjectFile::Initialize(MCContext &Ctx,
                                          const TargetMachine &TM) {
  TargetLoweringObjectFileELF::Initialize(Ctx, TM);

SmallDataSection = getContext().getELFSection(
      ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
  SmallBSSSection = getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
                                               ELF::SHF_WRITE | ELF::SHF_ALLOC);
}

// A address must be loaded from a small section if its size is less than the
// small section size threshold. Data in this section could be addressed by
// using gp_rel operator.
bool RISCVELFTargetObjectFile::isInSmallSection(uint64_t Size) const {
  // gcc has traditionally not treated zero-sized objects as small data, so this
  // is effectively part of the ABI.
  return Size > 0 && Size <= SSThreshold;
}

// Return true if this global address should be placed into small data/bss
// section.
bool RISCVELFTargetObjectFile::isGlobalInSmallSection(
    const GlobalObject *GO, const TargetMachine &TM) const {
  // Only global variables, not functions.
  const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GO);
  if (!GVA)
    return false;

// If the variable has an explicit section, it is placed in that section.
  if (GVA->hasSection()) {
    StringRef Section = GVA->getSection();

// Explicitly placing any variable in the small data section overrides
    // the global -G value.
    if (Section == ".sdata" || Section == ".sbss")
      return true;

// Otherwise reject putting the variable to small section if it has an
    // explicit section name.
    return false;
  }

if (((GVA->hasExternalLinkage() && GVA->isDeclaration()) ||
       GVA->hasCommonLinkage()))
    return false;

Type *Ty = GVA->getValueType();
  // It is possible that the type of the global is unsized, i.e. a declaration
  // of a extern struct. In this case don't presume it is in the small data
  // section. This happens e.g. when building the FreeBSD kernel.
  if (!Ty->isSized())
    return false;

return isInSmallSection(
      GVA->getParent()->getDataLayout().getTypeAllocSize(Ty));
}

MCSection *RISCVELFTargetObjectFile::SelectSectionForGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
  // Handle Small Section classification here.
  if (Kind.isBSS() && isGlobalInSmallSection(GO, TM))
    return SmallBSSSection;
  if (Kind.isData() && isGlobalInSmallSection(GO, TM))
    return SmallDataSection;

// Otherwise, we work the same as ELF.
  return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
}

void RISCVELFTargetObjectFile::getModuleMetadata(Module &M) {
  SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
  M.getModuleFlagsMetadata(ModuleFlags);

for (const auto &MFE : ModuleFlags) {
    StringRef Key = MFE.Key->getString();
    if (Key == "SmallDataLimit") {
      SSThreshold = mdconst::extract<ConstantInt>(MFE.Val)->getZExtValue();
      break;
    }
  }
}

/// Return true if this constant should be placed into small data section.
bool RISCVELFTargetObjectFile::isConstantInSmallSection(
    const DataLayout &DL, const Constant *CN) const {
  return isInSmallSection(DL.getTypeAllocSize(CN->getType()));
}

MCSection *RISCVELFTargetObjectFile::getSectionForConstant(
    const DataLayout &DL, SectionKind Kind, const Constant *C,
    Align &Alignment) const {
  if (isConstantInSmallSection(DL, C))
    return SmallDataSection;

// Otherwise, we work the same as ELF.
  return TargetLoweringObjectFileELF::getSectionForConstant(DL, Kind, C,
                                                            Alignment);
}

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Editing: RISCVTargetObjectFile.cpp

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