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//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
//
// 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 implements the LLVMTargetMachine class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
static cl::opt<bool> EnableTrapUnreachable("trap-unreachable",
cl::Hidden, cl::ZeroOrMore, cl::init(false),
cl::desc("Enable generating trap for unreachable"));
void LLVMTargetMachine::initAsmInfo() {
MRI.reset(TheTarget.createMCRegInfo(getTargetTriple().str()));
MII.reset(TheTarget.createMCInstrInfo());
// FIXME: Having an MCSubtargetInfo on the target machine is a hack due
// to some backends having subtarget feature dependent module level
// code generation. This is similar to the hack in the AsmPrinter for
// module level assembly etc.
STI.reset(TheTarget.createMCSubtargetInfo(
getTargetTriple().str(), getTargetCPU(), getTargetFeatureString()));
MCAsmInfo *TmpAsmInfo = TheTarget.createMCAsmInfo(
*MRI, getTargetTriple().str(), Options.MCOptions);
// TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
// and if the old one gets included then MCAsmInfo will be NULL and
// we'll crash later.
// Provide the user with a useful error message about what's wrong.
assert(TmpAsmInfo && "MCAsmInfo not initialized. "
"Make sure you include the correct TargetSelect.h"
"and that InitializeAllTargetMCs() is being invoked!");
if (Options.DisableIntegratedAS)
TmpAsmInfo->setUseIntegratedAssembler(false);
TmpAsmInfo->setPreserveAsmComments(Options.MCOptions.PreserveAsmComments);
TmpAsmInfo->setCompressDebugSections(Options.CompressDebugSections);
TmpAsmInfo->setRelaxELFRelocations(Options.RelaxELFRelocations);
if (Options.ExceptionModel != ExceptionHandling::None)
TmpAsmInfo->setExceptionsType(Options.ExceptionModel);
AsmInfo.reset(TmpAsmInfo);
}
LLVMTargetMachine::LLVMTargetMachine(const Target &T,
StringRef DataLayoutString,
const Triple &TT, StringRef CPU,
StringRef FS, const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
: TargetMachine(T, DataLayoutString, TT, CPU, FS, Options) {
this->RM = RM;
this->CMModel = CM;
this->OptLevel = OL;
if (EnableTrapUnreachable)
this->Options.TrapUnreachable = true;
}
TargetTransformInfo
LLVMTargetMachine::getTargetTransformInfo(const Function &F) {
return TargetTransformInfo(BasicTTIImpl(this, F));
}
/// addPassesToX helper drives creation and initialization of TargetPassConfig.
static TargetPassConfig *
addPassesToGenerateCode(LLVMTargetMachine &TM, PassManagerBase &PM,
bool DisableVerify,
MachineModuleInfoWrapperPass &MMIWP) {
// Targets may override createPassConfig to provide a target-specific
// subclass.
TargetPassConfig *PassConfig = TM.createPassConfig(PM);
// Set PassConfig options provided by TargetMachine.
PassConfig->setDisableVerify(DisableVerify);
PM.add(PassConfig);
PM.add(&MMIWP);
if (PassConfig->addISelPasses())
return nullptr;
PassConfig->addMachinePasses();
PassConfig->setInitialized();
return PassConfig;
}
bool LLVMTargetMachine::addAsmPrinter(PassManagerBase &PM,
raw_pwrite_stream &Out,
raw_pwrite_stream *DwoOut,
CodeGenFileType FileType,
MCContext &Context) {
if (Options.MCOptions.MCSaveTempLabels)
Context.setAllowTemporaryLabels(false);
const MCSubtargetInfo &STI = *getMCSubtargetInfo();
const MCAsmInfo &MAI = *getMCAsmInfo();
const MCRegisterInfo &MRI = *getMCRegisterInfo();
const MCInstrInfo &MII = *getMCInstrInfo();
std::unique_ptr<MCStreamer> AsmStreamer;
switch (FileType) {
case CGFT_AssemblyFile: {
MCInstPrinter *InstPrinter = getTarget().createMCInstPrinter(
getTargetTriple(), MAI.getAssemblerDialect(), MAI, MII, MRI);
// Create a code emitter if asked to show the encoding.
std::unique_ptr<MCCodeEmitter> MCE;
if (Options.MCOptions.ShowMCEncoding)
MCE.reset(getTarget().createMCCodeEmitter(MII, MRI, Context));
std::unique_ptr<MCAsmBackend> MAB(
getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions));
auto FOut = std::make_unique<formatted_raw_ostream>(Out);
MCStreamer *S = getTarget().createAsmStreamer(
Context, std::move(FOut), Options.MCOptions.AsmVerbose,
Options.MCOptions.MCUseDwarfDirectory, InstPrinter, std::move(MCE),
std::move(MAB), Options.MCOptions.ShowMCInst);
AsmStreamer.reset(S);
break;
}
case CGFT_ObjectFile: {
// Create the code emitter for the target if it exists. If not, .o file
// emission fails.
MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(MII, MRI, Context);
MCAsmBackend *MAB =
getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
if (!MCE || !MAB)
return true;
// Don't waste memory on names of temp labels.
Context.setUseNamesOnTempLabels(false);
Triple T(getTargetTriple().str());
AsmStreamer.reset(getTarget().createMCObjectStreamer(
T, Context, std::unique_ptr<MCAsmBackend>(MAB),
DwoOut ? MAB->createDwoObjectWriter(Out, *DwoOut)
: MAB->createObjectWriter(Out),
std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
Options.MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ true));
break;
}
case CGFT_Null:
// The Null output is intended for use for performance analysis and testing,
// not real users.
AsmStreamer.reset(getTarget().createNullStreamer(Context));
break;
}
// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
FunctionPass *Printer =
getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
if (!Printer)
return true;
PM.add(Printer);
return false;
}
bool LLVMTargetMachine::addPassesToEmitFile(
PassManagerBase &PM, raw_pwrite_stream &Out, raw_pwrite_stream *DwoOut,
CodeGenFileType FileType, bool DisableVerify,
MachineModuleInfoWrapperPass *MMIWP) {
// Add common CodeGen passes.
if (!MMIWP)
MMIWP = new MachineModuleInfoWrapperPass(this);
TargetPassConfig *PassConfig =
addPassesToGenerateCode(*this, PM, DisableVerify, *MMIWP);
if (!PassConfig)
return true;
if (!TargetPassConfig::willCompleteCodeGenPipeline()) {
if (this->getTargetTriple().isOSAIX()) {
// On AIX, we might manifest MCSymbols during SDAG lowering. For MIR
// testing to be meaningful, we need to ensure that the symbols created
// are MCSymbolXCOFF variants, which requires that
// the TargetLoweringObjectFile instance has been initialized.
MCContext &Ctx = MMIWP->getMMI().getContext();
const_cast<TargetLoweringObjectFile &>(*this->getObjFileLowering())
.Initialize(Ctx, *this);
}
PM.add(createPrintMIRPass(Out));
} else if (addAsmPrinter(PM, Out, DwoOut, FileType,
MMIWP->getMMI().getContext()))
return true;
PM.add(createFreeMachineFunctionPass());
return false;
}
/// addPassesToEmitMC - Add passes to the specified pass manager to get
/// machine code emitted with the MCJIT. This method returns true if machine
/// code is not supported. It fills the MCContext Ctx pointer which can be
/// used to build custom MCStreamer.
///
bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM, MCContext *&Ctx,
raw_pwrite_stream &Out,
bool DisableVerify) {
// Add common CodeGen passes.
MachineModuleInfoWrapperPass *MMIWP = new MachineModuleInfoWrapperPass(this);
TargetPassConfig *PassConfig =
addPassesToGenerateCode(*this, PM, DisableVerify, *MMIWP);
if (!PassConfig)
return true;
assert(TargetPassConfig::willCompleteCodeGenPipeline() &&
"Cannot emit MC with limited codegen pipeline");
Ctx = &MMIWP->getMMI().getContext();
if (Options.MCOptions.MCSaveTempLabels)
Ctx->setAllowTemporaryLabels(false);
// Create the code emitter for the target if it exists. If not, .o file
// emission fails.
const MCSubtargetInfo &STI = *getMCSubtargetInfo();
const MCRegisterInfo &MRI = *getMCRegisterInfo();
MCCodeEmitter *MCE =
getTarget().createMCCodeEmitter(*getMCInstrInfo(), MRI, *Ctx);
MCAsmBackend *MAB =
getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
if (!MCE || !MAB)
return true;
const Triple &T = getTargetTriple();
std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
T, *Ctx, std::unique_ptr<MCAsmBackend>(MAB), MAB->createObjectWriter(Out),
std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
Options.MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ true));
// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
FunctionPass *Printer =
getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
if (!Printer)
return true;
PM.add(Printer);
PM.add(createFreeMachineFunctionPass());
return false; // success!
}