262 lines
9.9 KiB
C++
262 lines
9.9 KiB
C++
//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LLVMTargetMachine class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/BasicTTIImpl.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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static cl::opt<bool> EnableTrapUnreachable("trap-unreachable",
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cl::Hidden, cl::ZeroOrMore, cl::init(false),
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cl::desc("Enable generating trap for unreachable"));
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void LLVMTargetMachine::initAsmInfo() {
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MRI.reset(TheTarget.createMCRegInfo(getTargetTriple().str()));
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MII.reset(TheTarget.createMCInstrInfo());
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// FIXME: Having an MCSubtargetInfo on the target machine is a hack due
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// to some backends having subtarget feature dependent module level
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// code generation. This is similar to the hack in the AsmPrinter for
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// module level assembly etc.
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STI.reset(TheTarget.createMCSubtargetInfo(
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getTargetTriple().str(), getTargetCPU(), getTargetFeatureString()));
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MCAsmInfo *TmpAsmInfo =
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TheTarget.createMCAsmInfo(*MRI, getTargetTriple().str());
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// TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
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// and if the old one gets included then MCAsmInfo will be NULL and
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// we'll crash later.
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// Provide the user with a useful error message about what's wrong.
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assert(TmpAsmInfo && "MCAsmInfo not initialized. "
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"Make sure you include the correct TargetSelect.h"
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"and that InitializeAllTargetMCs() is being invoked!");
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if (Options.DisableIntegratedAS)
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TmpAsmInfo->setUseIntegratedAssembler(false);
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TmpAsmInfo->setPreserveAsmComments(Options.MCOptions.PreserveAsmComments);
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TmpAsmInfo->setCompressDebugSections(Options.CompressDebugSections);
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TmpAsmInfo->setRelaxELFRelocations(Options.RelaxELFRelocations);
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if (Options.ExceptionModel != ExceptionHandling::None)
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TmpAsmInfo->setExceptionsType(Options.ExceptionModel);
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AsmInfo.reset(TmpAsmInfo);
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}
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LLVMTargetMachine::LLVMTargetMachine(const Target &T,
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StringRef DataLayoutString,
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const Triple &TT, StringRef CPU,
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StringRef FS, const TargetOptions &Options,
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Reloc::Model RM, CodeModel::Model CM,
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CodeGenOpt::Level OL)
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: TargetMachine(T, DataLayoutString, TT, CPU, FS, Options) {
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this->RM = RM;
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this->CMModel = CM;
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this->OptLevel = OL;
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if (EnableTrapUnreachable)
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this->Options.TrapUnreachable = true;
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}
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TargetTransformInfo
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LLVMTargetMachine::getTargetTransformInfo(const Function &F) {
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return TargetTransformInfo(BasicTTIImpl(this, F));
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}
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/// addPassesToX helper drives creation and initialization of TargetPassConfig.
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static TargetPassConfig *
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addPassesToGenerateCode(LLVMTargetMachine &TM, PassManagerBase &PM,
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bool DisableVerify, MachineModuleInfo &MMI) {
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// Targets may override createPassConfig to provide a target-specific
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// subclass.
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TargetPassConfig *PassConfig = TM.createPassConfig(PM);
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// Set PassConfig options provided by TargetMachine.
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PassConfig->setDisableVerify(DisableVerify);
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PM.add(PassConfig);
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PM.add(&MMI);
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if (PassConfig->addISelPasses())
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return nullptr;
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PassConfig->addMachinePasses();
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PassConfig->setInitialized();
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return PassConfig;
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}
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bool LLVMTargetMachine::addAsmPrinter(PassManagerBase &PM,
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raw_pwrite_stream &Out,
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raw_pwrite_stream *DwoOut,
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CodeGenFileType FileType,
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MCContext &Context) {
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if (Options.MCOptions.MCSaveTempLabels)
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Context.setAllowTemporaryLabels(false);
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const MCSubtargetInfo &STI = *getMCSubtargetInfo();
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const MCAsmInfo &MAI = *getMCAsmInfo();
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const MCRegisterInfo &MRI = *getMCRegisterInfo();
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const MCInstrInfo &MII = *getMCInstrInfo();
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std::unique_ptr<MCStreamer> AsmStreamer;
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switch (FileType) {
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case CGFT_AssemblyFile: {
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MCInstPrinter *InstPrinter = getTarget().createMCInstPrinter(
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getTargetTriple(), MAI.getAssemblerDialect(), MAI, MII, MRI);
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// Create a code emitter if asked to show the encoding.
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std::unique_ptr<MCCodeEmitter> MCE;
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if (Options.MCOptions.ShowMCEncoding)
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MCE.reset(getTarget().createMCCodeEmitter(MII, MRI, Context));
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std::unique_ptr<MCAsmBackend> MAB(
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getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions));
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auto FOut = llvm::make_unique<formatted_raw_ostream>(Out);
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MCStreamer *S = getTarget().createAsmStreamer(
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Context, std::move(FOut), Options.MCOptions.AsmVerbose,
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Options.MCOptions.MCUseDwarfDirectory, InstPrinter, std::move(MCE),
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std::move(MAB), Options.MCOptions.ShowMCInst);
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AsmStreamer.reset(S);
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break;
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}
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case CGFT_ObjectFile: {
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// Create the code emitter for the target if it exists. If not, .o file
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// emission fails.
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MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(MII, MRI, Context);
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MCAsmBackend *MAB =
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getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
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if (!MCE || !MAB)
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return true;
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// Don't waste memory on names of temp labels.
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Context.setUseNamesOnTempLabels(false);
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Triple T(getTargetTriple().str());
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AsmStreamer.reset(getTarget().createMCObjectStreamer(
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T, Context, std::unique_ptr<MCAsmBackend>(MAB),
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DwoOut ? MAB->createDwoObjectWriter(Out, *DwoOut)
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: MAB->createObjectWriter(Out),
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std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
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Options.MCOptions.MCIncrementalLinkerCompatible,
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/*DWARFMustBeAtTheEnd*/ true));
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break;
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}
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case CGFT_Null:
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// The Null output is intended for use for performance analysis and testing,
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// not real users.
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AsmStreamer.reset(getTarget().createNullStreamer(Context));
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break;
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}
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// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
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FunctionPass *Printer =
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getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
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if (!Printer)
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return true;
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PM.add(Printer);
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return false;
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}
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bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
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raw_pwrite_stream &Out,
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raw_pwrite_stream *DwoOut,
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CodeGenFileType FileType,
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bool DisableVerify,
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MachineModuleInfo *MMI) {
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// Add common CodeGen passes.
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if (!MMI)
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MMI = new MachineModuleInfo(this);
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TargetPassConfig *PassConfig =
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addPassesToGenerateCode(*this, PM, DisableVerify, *MMI);
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if (!PassConfig)
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return true;
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if (!TargetPassConfig::willCompleteCodeGenPipeline()) {
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PM.add(createPrintMIRPass(Out));
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} else if (addAsmPrinter(PM, Out, DwoOut, FileType, MMI->getContext()))
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return true;
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PM.add(createFreeMachineFunctionPass());
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return false;
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}
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/// addPassesToEmitMC - Add passes to the specified pass manager to get
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/// machine code emitted with the MCJIT. This method returns true if machine
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/// code is not supported. It fills the MCContext Ctx pointer which can be
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/// used to build custom MCStreamer.
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///
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bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM, MCContext *&Ctx,
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raw_pwrite_stream &Out,
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bool DisableVerify) {
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// Add common CodeGen passes.
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MachineModuleInfo *MMI = new MachineModuleInfo(this);
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TargetPassConfig *PassConfig =
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addPassesToGenerateCode(*this, PM, DisableVerify, *MMI);
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if (!PassConfig)
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return true;
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assert(TargetPassConfig::willCompleteCodeGenPipeline() &&
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"Cannot emit MC with limited codegen pipeline");
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Ctx = &MMI->getContext();
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if (Options.MCOptions.MCSaveTempLabels)
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Ctx->setAllowTemporaryLabels(false);
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// Create the code emitter for the target if it exists. If not, .o file
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// emission fails.
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const MCSubtargetInfo &STI = *getMCSubtargetInfo();
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const MCRegisterInfo &MRI = *getMCRegisterInfo();
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MCCodeEmitter *MCE =
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getTarget().createMCCodeEmitter(*getMCInstrInfo(), MRI, *Ctx);
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MCAsmBackend *MAB =
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getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
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if (!MCE || !MAB)
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return true;
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const Triple &T = getTargetTriple();
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std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
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T, *Ctx, std::unique_ptr<MCAsmBackend>(MAB), MAB->createObjectWriter(Out),
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std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
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Options.MCOptions.MCIncrementalLinkerCompatible,
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/*DWARFMustBeAtTheEnd*/ true));
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// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
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FunctionPass *Printer =
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getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
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if (!Printer)
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return true;
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PM.add(Printer);
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PM.add(createFreeMachineFunctionPass());
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return false; // success!
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}
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