llvm/llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp

//===-- HexagonTargetObjectFile.cpp ---------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the HexagonTargetAsmInfo properties.
//
//===----------------------------------------------------------------------===//

#include "HexagonTargetObjectFile.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalObject.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"

#define DEBUG_TYPE …

usingnamespacellvm;

static cl::opt<unsigned> SmallDataThreshold("hexagon-small-data-threshold",
  cl::init(8), cl::Hidden,
  cl::desc("The maximum size of an object in the sdata section"));

static cl::opt<bool> NoSmallDataSorting("mno-sort-sda", cl::init(false),
  cl::Hidden, cl::desc("Disable small data sections sorting"));

static cl::opt<bool>
    StaticsInSData("hexagon-statics-in-small-data", cl::Hidden,
                   cl::desc("Allow static variables in .sdata"));

static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
  cl::Hidden, cl::init(false),
  cl::desc("Trace global value placement"));

static cl::opt<bool>
    EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
                 cl::desc("Emit hexagon jump tables in function section"));

static cl::opt<bool>
    EmitLutInText("hexagon-emit-lut-text", cl::Hidden, cl::init(false),
                 cl::desc("Emit hexagon lookup tables in function section"));

// TraceGVPlacement controls messages for all builds. For builds with assertions
// (debug or release), messages are also controlled by the usual debug flags
// (e.g. -debug and -debug-only=globallayout)
#define TRACE_TO(s, X) …
#ifdef NDEBUG
#define TRACE(X) …
#else
#define TRACE …
#endif

// Returns true if the section name is such that the symbol will be put
// in a small data section.
// For instance, global variables with section attributes such as ".sdata"
// ".sdata.*", ".sbss", and ".sbss.*" will go into small data.
static bool isSmallDataSection(StringRef Sec) { … }

static const char *getSectionSuffixForSize(unsigned Size) { … }

void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
      const TargetMachine &TM) { … }

MCSection *HexagonTargetObjectFile::SelectSectionForGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const { … }

MCSection *HexagonTargetObjectFile::getExplicitSectionGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const { … }

/// Return true if this global value should be placed into small data/bss
/// section.
bool HexagonTargetObjectFile::isGlobalInSmallSection(const GlobalObject *GO,
      const TargetMachine &TM) const { … }

bool HexagonTargetObjectFile::isSmallDataEnabled(const TargetMachine &TM)
    const { … }

unsigned HexagonTargetObjectFile::getSmallDataSize() const { … }

bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
    bool UsesLabelDifference, const Function &F) const { … }

/// Descends any type down to "elementary" components,
/// discovering the smallest addressable one.
/// If zero is returned, declaration will not be modified.
unsigned HexagonTargetObjectFile::getSmallestAddressableSize(const Type *Ty,
      const GlobalValue *GV, const TargetMachine &TM) const { … }

MCSection *HexagonTargetObjectFile::selectSmallSectionForGlobal(
    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const { … }

// Return the function that uses the lookup table. If there are more
// than one live function that uses this look table, bail out and place
// the lookup table in default section.
const Function *
HexagonTargetObjectFile::getLutUsedFunction(const GlobalObject *GO) const { … }

MCSection *HexagonTargetObjectFile::selectSectionForLookupTable(
    const GlobalObject *GO, const TargetMachine &TM, const Function *Fn) const { … }