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1c7fe7f803
When GlobalISel is configured to abort rather than fallback the only thing that resetting the machine function does is make things harder to debug. If we ever get to this point in the abort configuration it indicates that we've already hit a bug, so this changes the behaviour to abort instead. llvm-svn: 291977
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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