forked from OSchip/llvm-project
103 lines
3.8 KiB
C++
103 lines
3.8 KiB
C++
//===-- HexagonTargetObjectFile.cpp - Hexagon asm properties --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of the HexagonTargetAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "HexagonTargetObjectFile.h"
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#include "HexagonSubtarget.h"
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#include "HexagonTargetMachine.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ELF.h"
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using namespace llvm;
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static cl::opt<int> SmallDataThreshold("hexagon-small-data-threshold",
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cl::init(8), cl::Hidden,
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cl::desc("The maximum size of an object in the sdata section"));
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void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
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const TargetMachine &TM) {
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TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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InitializeELF(TM.Options.UseInitArray);
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SmallDataSection =
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getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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SmallBSSSection =
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getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getBSS());
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}
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// sdata/sbss support taken largely from the MIPS Backend.
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static bool IsInSmallSection(uint64_t Size) {
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return Size > 0 && Size <= (uint64_t)SmallDataThreshold;
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}
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bool HexagonTargetObjectFile::IsSmallDataEnabled () const {
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return SmallDataThreshold > 0;
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}
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/// IsGlobalInSmallSection - Return true if this global value should be
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/// placed into small data/bss section.
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bool HexagonTargetObjectFile::IsGlobalInSmallSection(const GlobalValue *GV,
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const TargetMachine &TM) const {
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// If the primary definition of this global value is outside the current
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// translation unit or the global value is available for inspection but not
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// emission, then do nothing.
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if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage())
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return false;
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// Otherwise, Check if GV should be in sdata/sbss, when normally it would end
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// up in getKindForGlobal(GV, TM).
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return IsGlobalInSmallSection(GV, TM, getKindForGlobal(GV, TM));
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}
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/// IsGlobalInSmallSection - Return true if this global value should be
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/// placed into small data/bss section.
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bool HexagonTargetObjectFile::
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IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM,
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SectionKind Kind) const {
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// Only global variables, not functions.
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const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
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if (!GVA)
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return false;
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if (Kind.isBSS() || Kind.isDataNoRel() || Kind.isCommon()) {
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Type *Ty = GV->getType()->getElementType();
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return IsInSmallSection(
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TM.getSubtargetImpl()->getDataLayout()->getTypeAllocSize(Ty));
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}
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return false;
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}
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const MCSection *
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HexagonTargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV,
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SectionKind Kind, Mangler &Mang,
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const TargetMachine &TM) const {
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// Handle Small Section classification here.
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if (Kind.isBSS() && IsGlobalInSmallSection(GV, TM, Kind))
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return SmallBSSSection;
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if (Kind.isDataNoRel() && IsGlobalInSmallSection(GV, TM, Kind))
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return SmallDataSection;
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// Otherwise, we work the same as ELF.
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return TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind, Mang,TM);
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}
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