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11c412fd2c
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. llvm-svn: 154294
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
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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 describes the general parts of a Target machine.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/GlobalValue.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeGenInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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//---------------------------------------------------------------------------
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// Command-line options that tend to be useful on more than one back-end.
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//
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namespace llvm {
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bool HasDivModLibcall;
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bool AsmVerbosityDefault(false);
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}
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static cl::opt<bool>
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DataSections("fdata-sections",
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cl::desc("Emit data into separate sections"),
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cl::init(false));
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static cl::opt<bool>
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FunctionSections("ffunction-sections",
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cl::desc("Emit functions into separate sections"),
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cl::init(false));
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//---------------------------------------------------------------------------
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// TargetMachine Class
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//
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TargetMachine::TargetMachine(const Target &T,
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StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options)
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: TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
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CodeGenInfo(0), AsmInfo(0),
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MCRelaxAll(false),
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MCNoExecStack(false),
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MCSaveTempLabels(false),
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MCUseLoc(true),
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MCUseCFI(true),
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MCUseDwarfDirectory(false),
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Options(Options) {
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}
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TargetMachine::~TargetMachine() {
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delete CodeGenInfo;
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delete AsmInfo;
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}
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/// getRelocationModel - Returns the code generation relocation model. The
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/// choices are static, PIC, and dynamic-no-pic, and target default.
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Reloc::Model TargetMachine::getRelocationModel() const {
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if (!CodeGenInfo)
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return Reloc::Default;
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return CodeGenInfo->getRelocationModel();
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}
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/// getCodeModel - Returns the code model. The choices are small, kernel,
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/// medium, large, and target default.
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CodeModel::Model TargetMachine::getCodeModel() const {
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if (!CodeGenInfo)
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return CodeModel::Default;
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return CodeGenInfo->getCodeModel();
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}
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TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
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bool isLocal = GV->hasLocalLinkage();
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bool isDeclaration = GV->isDeclaration();
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// FIXME: what should we do for protected and internal visibility?
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// For variables, is internal different from hidden?
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bool isHidden = GV->hasHiddenVisibility();
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if (getRelocationModel() == Reloc::PIC_ &&
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!Options.PositionIndependentExecutable) {
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if (isLocal || isHidden)
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return TLSModel::LocalDynamic;
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else
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return TLSModel::GeneralDynamic;
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} else {
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if (!isDeclaration || isHidden)
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return TLSModel::LocalExec;
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else
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return TLSModel::InitialExec;
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}
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}
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/// getOptLevel - Returns the optimization level: None, Less,
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/// Default, or Aggressive.
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CodeGenOpt::Level TargetMachine::getOptLevel() const {
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if (!CodeGenInfo)
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return CodeGenOpt::Default;
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return CodeGenInfo->getOptLevel();
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}
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bool TargetMachine::getAsmVerbosityDefault() {
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return AsmVerbosityDefault;
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}
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void TargetMachine::setAsmVerbosityDefault(bool V) {
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AsmVerbosityDefault = V;
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}
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bool TargetMachine::getFunctionSections() {
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return FunctionSections;
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}
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bool TargetMachine::getDataSections() {
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return DataSections;
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}
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void TargetMachine::setFunctionSections(bool V) {
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FunctionSections = V;
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}
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void TargetMachine::setDataSections(bool V) {
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DataSections = V;
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}
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