2001-09-14 13:34:53 +08:00
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//===-- TargetMachine.cpp - General Target Information ---------------------==//
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2005-04-22 06:55:34 +08:00
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//
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2003-10-21 03:43:21 +08:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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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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2005-04-22 06:55:34 +08:00
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//
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2003-10-21 03:43:21 +08:00
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//===----------------------------------------------------------------------===//
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2001-09-14 13:34:53 +08:00
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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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2001-07-21 20:42:08 +08:00
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2012-12-04 00:50:05 +08:00
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#include "llvm/Target/TargetMachine.h"
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2013-03-14 06:26:59 +08:00
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/IR/Function.h"
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2013-01-02 19:36:10 +08:00
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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2014-02-20 04:30:41 +08:00
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#include "llvm/IR/Mangler.h"
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2009-08-23 04:48:53 +08:00
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#include "llvm/MC/MCAsmInfo.h"
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2012-03-26 02:10:17 +08:00
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#include "llvm/MC/MCCodeGenInfo.h"
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2014-02-20 04:30:41 +08:00
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#include "llvm/MC/MCContext.h"
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2014-04-23 19:16:03 +08:00
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#include "llvm/MC/MCTargetOptions.h"
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2014-02-20 04:30:41 +08:00
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#include "llvm/MC/SectionKind.h"
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2004-09-02 06:55:40 +08:00
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#include "llvm/Support/CommandLine.h"
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2014-02-20 04:30:41 +08:00
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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2014-08-05 05:25:23 +08:00
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#include "llvm/Target/TargetSubtargetInfo.h"
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2003-12-29 05:23:38 +08:00
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using namespace llvm;
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2003-11-12 06:41:34 +08:00
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2001-07-21 20:42:08 +08:00
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//---------------------------------------------------------------------------
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2003-12-29 05:23:38 +08:00
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// TargetMachine Class
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//
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2004-08-11 07:10:25 +08:00
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2011-07-08 09:53:10 +08:00
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TargetMachine::TargetMachine(const Target &T,
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2011-12-03 06:16:29 +08:00
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StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options)
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2011-07-20 09:27:58 +08:00
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: TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
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2014-04-25 13:30:21 +08:00
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CodeGenInfo(nullptr), AsmInfo(nullptr),
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2013-12-07 09:49:19 +08:00
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RequireStructuredCFG(false),
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2011-12-03 06:16:29 +08:00
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Options(Options) {
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2009-06-09 06:53:56 +08:00
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}
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2003-12-29 05:23:38 +08:00
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TargetMachine::~TargetMachine() {
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2011-07-20 09:27:58 +08:00
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delete CodeGenInfo;
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2006-09-08 07:39:26 +08:00
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delete AsmInfo;
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2003-12-29 05:23:38 +08:00
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}
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2013-03-14 06:26:59 +08:00
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/// \brief Reset the target options based on the function's attributes.
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2014-09-26 09:28:10 +08:00
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void TargetMachine::resetTargetOptions(const Function &F) const {
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#define RESET_OPTION(X, Y) \
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do { \
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if (F.hasFnAttribute(Y)) \
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Options.X = (F.getAttributes() \
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.getAttribute(AttributeSet::FunctionIndex, Y) \
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.getValueAsString() == "true"); \
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2013-03-14 06:26:59 +08:00
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} while (0)
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RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
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RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
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RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
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RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
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RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
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RESET_OPTION(UseSoftFloat, "use-soft-float");
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RESET_OPTION(DisableTailCalls, "disable-tail-calls");
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2014-04-23 19:16:03 +08:00
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2014-09-26 09:28:10 +08:00
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Options.MCOptions.SanitizeAddress = F.hasFnAttribute(Attribute::SanitizeAddress);
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2013-03-14 06:26:59 +08:00
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}
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2006-02-23 04:19:42 +08:00
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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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2011-07-19 14:37:02 +08:00
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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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2006-02-23 04:19:42 +08:00
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}
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2006-05-24 02:18:46 +08:00
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2006-07-06 09:53:36 +08:00
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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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2011-07-20 15:51:56 +08:00
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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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2006-07-06 09:53:36 +08:00
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}
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2012-06-23 19:37:03 +08:00
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/// Get the IR-specified TLS model for Var.
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2014-05-29 02:15:43 +08:00
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static TLSModel::Model getSelectedTLSModel(const GlobalValue *GV) {
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switch (GV->getThreadLocalMode()) {
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2012-06-23 19:37:03 +08:00
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case GlobalVariable::NotThreadLocal:
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llvm_unreachable("getSelectedTLSModel for non-TLS variable");
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break;
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case GlobalVariable::GeneralDynamicTLSModel:
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return TLSModel::GeneralDynamic;
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case GlobalVariable::LocalDynamicTLSModel:
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return TLSModel::LocalDynamic;
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case GlobalVariable::InitialExecTLSModel:
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return TLSModel::InitialExec;
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case GlobalVariable::LocalExecTLSModel:
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return TLSModel::LocalExec;
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}
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llvm_unreachable("invalid TLS model");
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}
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2012-04-09 01:20:55 +08:00
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TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
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2014-05-24 03:16:56 +08:00
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bool isLocal = GV->hasLocalLinkage();
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bool isDeclaration = GV->isDeclaration();
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2012-06-23 19:37:03 +08:00
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bool isPIC = getRelocationModel() == Reloc::PIC_;
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bool isPIE = Options.PositionIndependentExecutable;
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2012-04-09 01:20:55 +08:00
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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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2014-05-24 03:16:56 +08:00
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bool isHidden = GV->hasHiddenVisibility();
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2012-04-09 01:20:55 +08:00
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2012-06-23 19:37:03 +08:00
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TLSModel::Model Model;
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if (isPIC && !isPIE) {
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2012-04-09 01:20:55 +08:00
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if (isLocal || isHidden)
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2012-06-23 19:37:03 +08:00
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Model = TLSModel::LocalDynamic;
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2012-04-09 01:20:55 +08:00
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else
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2012-06-23 19:37:03 +08:00
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Model = TLSModel::GeneralDynamic;
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2012-04-09 01:20:55 +08:00
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} else {
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if (!isDeclaration || isHidden)
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2012-06-23 19:37:03 +08:00
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Model = TLSModel::LocalExec;
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2012-04-09 01:20:55 +08:00
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else
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2012-06-23 19:37:03 +08:00
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Model = TLSModel::InitialExec;
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2012-04-09 01:20:55 +08:00
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}
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2012-06-23 19:37:03 +08:00
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2014-05-29 02:15:43 +08:00
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// If the user specified a more specific model, use that.
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TLSModel::Model SelectedModel = getSelectedTLSModel(GV);
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if (SelectedModel > Model)
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return SelectedModel;
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2012-06-23 19:37:03 +08:00
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return Model;
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2012-04-09 01:20:55 +08:00
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}
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2011-11-16 16:38:26 +08:00
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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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2013-11-23 03:11:24 +08:00
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void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
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if (CodeGenInfo)
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CodeGenInfo->setOptLevel(Level);
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}
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2014-05-21 07:59:50 +08:00
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bool TargetMachine::getAsmVerbosityDefault() const {
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return Options.MCOptions.AsmVerbose;
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2009-03-25 09:47:28 +08:00
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}
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void TargetMachine::setAsmVerbosityDefault(bool V) {
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2014-05-21 07:59:50 +08:00
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Options.MCOptions.AsmVerbose = V;
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2009-03-25 09:47:28 +08:00
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}
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2014-05-21 05:25:34 +08:00
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bool TargetMachine::getFunctionSections() const {
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return Options.FunctionSections;
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2010-04-13 08:36:43 +08:00
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}
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2014-05-21 05:25:34 +08:00
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bool TargetMachine::getDataSections() const {
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return Options.DataSections;
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2010-04-13 08:36:43 +08:00
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}
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void TargetMachine::setFunctionSections(bool V) {
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2014-05-21 05:25:34 +08:00
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Options.FunctionSections = V;
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2010-04-13 08:36:43 +08:00
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}
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void TargetMachine::setDataSections(bool V) {
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2014-05-21 05:25:34 +08:00
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Options.DataSections = V;
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2010-04-13 08:36:43 +08:00
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}
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2014-02-20 04:30:41 +08:00
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void TargetMachine::getNameWithPrefix(SmallVectorImpl<char> &Name,
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const GlobalValue *GV, Mangler &Mang,
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bool MayAlwaysUsePrivate) const {
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if (MayAlwaysUsePrivate || !GV->hasPrivateLinkage()) {
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// Simple case: If GV is not private, it is not important to find out if
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// private labels are legal in this case or not.
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Mang.getNameWithPrefix(Name, GV, false);
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return;
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}
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SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, *this);
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const TargetLoweringObjectFile &TLOF =
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2014-08-05 05:25:23 +08:00
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getSubtargetImpl()->getTargetLowering()->getObjFileLowering();
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2014-02-20 04:30:41 +08:00
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const MCSection *TheSection = TLOF.SectionForGlobal(GV, GVKind, Mang, *this);
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bool CannotUsePrivateLabel = TLOF.isSectionAtomizableBySymbols(*TheSection);
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Mang.getNameWithPrefix(Name, GV, CannotUsePrivateLabel);
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}
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MCSymbol *TargetMachine::getSymbol(const GlobalValue *GV, Mangler &Mang) const {
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SmallString<60> NameStr;
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getNameWithPrefix(NameStr, GV, Mang);
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const TargetLoweringObjectFile &TLOF =
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2014-08-05 05:25:23 +08:00
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getSubtargetImpl()->getTargetLowering()->getObjFileLowering();
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2014-02-20 04:30:41 +08:00
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return TLOF.getContext().GetOrCreateSymbol(NameStr.str());
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}
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