mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-11 23:05:31 +00:00
253933ee9e
optimizations which are valid for position independent code being linked into a single executable, but not for such code being linked into a shared library. I discussed the design of this with Eric Christopher, and the decision was to support an optional bit rather than a completely separate relocation model. Fundamentally, this is still PIC relocation, its just that certain optimizations are only valid under a PIC relocation model when the resulting code won't be in a shared library. The simplest path to here is to expose a single bit option in the TargetOptions. If folks have different/better designs, I'm all ears. =] I've included the first optimization based upon this: changing TLS models to the *Exec models when PIE is enabled. This is the LLVM component of PR12380 and is all of the hard work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154294 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file describes the general parts of a Target machine.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/GlobalValue.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCCodeGenInfo.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
using namespace llvm;
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Command-line options that tend to be useful on more than one back-end.
|
|
//
|
|
|
|
namespace llvm {
|
|
bool HasDivModLibcall;
|
|
bool AsmVerbosityDefault(false);
|
|
}
|
|
|
|
static cl::opt<bool>
|
|
DataSections("fdata-sections",
|
|
cl::desc("Emit data into separate sections"),
|
|
cl::init(false));
|
|
static cl::opt<bool>
|
|
FunctionSections("ffunction-sections",
|
|
cl::desc("Emit functions into separate sections"),
|
|
cl::init(false));
|
|
|
|
//---------------------------------------------------------------------------
|
|
// TargetMachine Class
|
|
//
|
|
|
|
TargetMachine::TargetMachine(const Target &T,
|
|
StringRef TT, StringRef CPU, StringRef FS,
|
|
const TargetOptions &Options)
|
|
: TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
|
|
CodeGenInfo(0), AsmInfo(0),
|
|
MCRelaxAll(false),
|
|
MCNoExecStack(false),
|
|
MCSaveTempLabels(false),
|
|
MCUseLoc(true),
|
|
MCUseCFI(true),
|
|
MCUseDwarfDirectory(false),
|
|
Options(Options) {
|
|
}
|
|
|
|
TargetMachine::~TargetMachine() {
|
|
delete CodeGenInfo;
|
|
delete AsmInfo;
|
|
}
|
|
|
|
/// getRelocationModel - Returns the code generation relocation model. The
|
|
/// choices are static, PIC, and dynamic-no-pic, and target default.
|
|
Reloc::Model TargetMachine::getRelocationModel() const {
|
|
if (!CodeGenInfo)
|
|
return Reloc::Default;
|
|
return CodeGenInfo->getRelocationModel();
|
|
}
|
|
|
|
/// getCodeModel - Returns the code model. The choices are small, kernel,
|
|
/// medium, large, and target default.
|
|
CodeModel::Model TargetMachine::getCodeModel() const {
|
|
if (!CodeGenInfo)
|
|
return CodeModel::Default;
|
|
return CodeGenInfo->getCodeModel();
|
|
}
|
|
|
|
TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
|
|
bool isLocal = GV->hasLocalLinkage();
|
|
bool isDeclaration = GV->isDeclaration();
|
|
// FIXME: what should we do for protected and internal visibility?
|
|
// For variables, is internal different from hidden?
|
|
bool isHidden = GV->hasHiddenVisibility();
|
|
|
|
if (getRelocationModel() == Reloc::PIC_ &&
|
|
!Options.PositionIndependentExecutable) {
|
|
if (isLocal || isHidden)
|
|
return TLSModel::LocalDynamic;
|
|
else
|
|
return TLSModel::GeneralDynamic;
|
|
} else {
|
|
if (!isDeclaration || isHidden)
|
|
return TLSModel::LocalExec;
|
|
else
|
|
return TLSModel::InitialExec;
|
|
}
|
|
}
|
|
|
|
/// getOptLevel - Returns the optimization level: None, Less,
|
|
/// Default, or Aggressive.
|
|
CodeGenOpt::Level TargetMachine::getOptLevel() const {
|
|
if (!CodeGenInfo)
|
|
return CodeGenOpt::Default;
|
|
return CodeGenInfo->getOptLevel();
|
|
}
|
|
|
|
bool TargetMachine::getAsmVerbosityDefault() {
|
|
return AsmVerbosityDefault;
|
|
}
|
|
|
|
void TargetMachine::setAsmVerbosityDefault(bool V) {
|
|
AsmVerbosityDefault = V;
|
|
}
|
|
|
|
bool TargetMachine::getFunctionSections() {
|
|
return FunctionSections;
|
|
}
|
|
|
|
bool TargetMachine::getDataSections() {
|
|
return DataSections;
|
|
}
|
|
|
|
void TargetMachine::setFunctionSections(bool V) {
|
|
FunctionSections = V;
|
|
}
|
|
|
|
void TargetMachine::setDataSections(bool V) {
|
|
DataSections = V;
|
|
}
|
|
|