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