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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/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
static cl::opt<bool>
EnableTrapUnreachable("trap-unreachable", cl::Hidden,
cl::desc("Enable generating trap for unreachable"));
void LLVMTargetMachine::initAsmInfo() {
MRI.reset(TheTarget.createMCRegInfo(getTargetTriple().str()));
assert(MRI && "Unable to create reg info");
MII.reset(TheTarget.createMCInstrInfo());
assert(MII && "Unable to create instruction info");
// 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()));
assert(STI && "Unable to create subtarget info");
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.BinutilsVersion.first > 0)
TmpAsmInfo->setBinutilsVersion(Options.BinutilsVersion);
if (Options.DisableIntegratedAS) {
TmpAsmInfo->setUseIntegratedAssembler(false);
// If there is explict option disable integratedAS, we can't use it for
// inlineasm either.
TmpAsmInfo->setParseInlineAsmUsingAsmParser(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) const {
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) {
Expected<std::unique_ptr<MCStreamer>> MCStreamerOrErr =
createMCStreamer(Out, DwoOut, FileType, Context);
if (auto Err = MCStreamerOrErr.takeError())
return true;
// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
FunctionPass *Printer =
getTarget().createAsmPrinter(*this, std::move(*MCStreamerOrErr));
if (!Printer)
return true;
PM.add(Printer);
return false;
}
Expected<std::unique_ptr<MCStreamer>> LLVMTargetMachine::createMCStreamer(
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, Context));
bool UseDwarfDirectory = false;
switch (Options.MCOptions.MCUseDwarfDirectory) {
case MCTargetOptions::DisableDwarfDirectory:
UseDwarfDirectory = false;
break;
case MCTargetOptions::EnableDwarfDirectory:
UseDwarfDirectory = true;
break;
case MCTargetOptions::DefaultDwarfDirectory:
UseDwarfDirectory = MAI.enableDwarfFileDirectoryDefault();
break;
}
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,
UseDwarfDirectory, 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, Context);
if (!MCE)
return make_error<StringError>("createMCCodeEmitter failed",
inconvertibleErrorCode());
MCAsmBackend *MAB =
getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
if (!MAB)
return make_error<StringError>("createMCAsmBackend failed",
inconvertibleErrorCode());
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;
}
return std::move(AsmStreamer);
}
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 (addAsmPrinter(PM, Out, DwoOut, FileType, MMIWP->getMMI().getContext()))
return true;
} else {
// MIR printing is redundant with -filetype=null.
if (FileType != CGFT_Null)
PM.add(createPrintMIRPass(Out));
}
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();
// libunwind is unable to load compact unwind dynamically, so we must generate
// DWARF unwind info for the JIT.
Options.MCOptions.EmitDwarfUnwind = EmitDwarfUnwindType::Always;
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(), *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!
}