327 lines
12 KiB
C++
327 lines
12 KiB
C++
//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
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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 implements the LLVMTargetMachine class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachine.h"
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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/IRPrintingPasses.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/MC/MCAsmInfo.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/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/TargetOptions.h"
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#include "llvm/Transforms/Scalar.h"
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using namespace llvm;
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// Enable or disable FastISel. Both options are needed, because
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// FastISel is enabled by default with -fast, and we wish to be
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// able to enable or disable fast-isel independently from -O0.
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static cl::opt<cl::boolOrDefault>
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EnableFastISelOption("fast-isel", cl::Hidden,
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cl::desc("Enable the \"fast\" instruction selector"));
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static cl::opt<bool>
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EnableGlobalISel("global-isel", cl::Hidden, cl::init(false),
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cl::desc("Enable the \"global\" instruction selector"));
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void LLVMTargetMachine::initAsmInfo() {
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MRI = TheTarget.createMCRegInfo(getTargetTriple().str());
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MII = 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 = TheTarget.createMCSubtargetInfo(getTargetTriple().str(), getTargetCPU(),
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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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if (Options.CompressDebugSections)
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TmpAsmInfo->setCompressDebugSections(DebugCompressionType::DCT_ZlibGnu);
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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 = 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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T.adjustCodeGenOpts(TT, RM, CM);
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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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}
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TargetIRAnalysis LLVMTargetMachine::getTargetIRAnalysis() {
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return TargetIRAnalysis([this](const Function &F) {
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return TargetTransformInfo(BasicTTIImpl(this, F));
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});
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}
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/// addPassesToX helper drives creation and initialization of TargetPassConfig.
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static MCContext *
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addPassesToGenerateCode(LLVMTargetMachine *TM, PassManagerBase &PM,
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bool DisableVerify, AnalysisID StartBefore,
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AnalysisID StartAfter, AnalysisID StopBefore,
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AnalysisID StopAfter,
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MachineFunctionInitializer *MFInitializer = nullptr) {
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// When in emulated TLS mode, add the LowerEmuTLS pass.
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if (TM->Options.EmulatedTLS)
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PM.add(createLowerEmuTLSPass(TM));
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PM.add(createPreISelIntrinsicLoweringPass());
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// Add internal analysis passes from the target machine.
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PM.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
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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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PassConfig->setStartStopPasses(StartBefore, StartAfter, StopBefore,
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StopAfter);
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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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PassConfig->addIRPasses();
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PassConfig->addCodeGenPrepare();
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PassConfig->addPassesToHandleExceptions();
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PassConfig->addISelPrepare();
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MachineModuleInfo *MMI = new MachineModuleInfo(TM);
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MMI->setMachineFunctionInitializer(MFInitializer);
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PM.add(MMI);
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// Enable FastISel with -fast, but allow that to be overridden.
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TM->setO0WantsFastISel(EnableFastISelOption != cl::BOU_FALSE);
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if (EnableFastISelOption == cl::BOU_TRUE ||
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(TM->getOptLevel() == CodeGenOpt::None &&
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TM->getO0WantsFastISel()))
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TM->setFastISel(true);
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// Ask the target for an isel.
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if (LLVM_UNLIKELY(EnableGlobalISel)) {
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if (PassConfig->addIRTranslator())
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return nullptr;
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PassConfig->addPreLegalizeMachineIR();
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if (PassConfig->addLegalizeMachineIR())
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return nullptr;
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// Before running the register bank selector, ask the target if it
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// wants to run some passes.
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PassConfig->addPreRegBankSelect();
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if (PassConfig->addRegBankSelect())
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return nullptr;
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PassConfig->addPreGlobalInstructionSelect();
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if (PassConfig->addGlobalInstructionSelect())
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return nullptr;
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// Pass to reset the MachineFunction if the ISel failed.
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PM.add(createResetMachineFunctionPass(
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PassConfig->reportDiagnosticWhenGlobalISelFallback(),
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PassConfig->isGlobalISelAbortEnabled()));
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// Provide a fallback path when we do not want to abort on
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// not-yet-supported input.
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if (LLVM_UNLIKELY(!PassConfig->isGlobalISelAbortEnabled()) &&
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PassConfig->addInstSelector())
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return nullptr;
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} else if (PassConfig->addInstSelector())
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return nullptr;
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PassConfig->addMachinePasses();
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PassConfig->setInitialized();
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return &MMI->getContext();
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}
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bool LLVMTargetMachine::addPassesToEmitFile(
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PassManagerBase &PM, raw_pwrite_stream &Out, CodeGenFileType FileType,
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bool DisableVerify, AnalysisID StartBefore, AnalysisID StartAfter,
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AnalysisID StopBefore, AnalysisID StopAfter,
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MachineFunctionInitializer *MFInitializer) {
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// Add common CodeGen passes.
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MCContext *Context =
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addPassesToGenerateCode(this, PM, DisableVerify, StartBefore, StartAfter,
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StopBefore, StopAfter, MFInitializer);
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if (!Context)
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return true;
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if (StopBefore || StopAfter) {
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PM.add(createPrintMIRPass(Out));
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return false;
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}
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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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MCCodeEmitter *MCE = nullptr;
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if (Options.MCOptions.ShowMCEncoding)
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MCE = getTarget().createMCCodeEmitter(MII, MRI, *Context);
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MCAsmBackend *MAB =
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getTarget().createMCAsmBackend(MRI, getTargetTriple().str(), TargetCPU,
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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, MCE, MAB,
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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(MRI, getTargetTriple().str(), TargetCPU,
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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, *MAB, Out, 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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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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Ctx = addPassesToGenerateCode(this, PM, DisableVerify, nullptr, nullptr,
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nullptr, nullptr);
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if (!Ctx)
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return true;
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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 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(MRI, getTargetTriple().str(), TargetCPU,
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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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const MCSubtargetInfo &STI = *getMCSubtargetInfo();
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std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
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T, *Ctx, *MAB, Out, 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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