326 lines
12 KiB
C++
326 lines
12 KiB
C++
//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the LLVMTargetMachine class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#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/IRPrintingPasses.h"
|
|
#include "llvm/IR/LegacyPassManager.h"
|
|
#include "llvm/IR/Verifier.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCInstrInfo.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/TargetOptions.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
using namespace llvm;
|
|
|
|
// Enable or disable FastISel. Both options are needed, because
|
|
// FastISel is enabled by default with -fast, and we wish to be
|
|
// able to enable or disable fast-isel independently from -O0.
|
|
static cl::opt<cl::boolOrDefault>
|
|
EnableFastISelOption("fast-isel", cl::Hidden,
|
|
cl::desc("Enable the \"fast\" instruction selector"));
|
|
|
|
static cl::opt<bool>
|
|
EnableGlobalISel("global-isel", cl::Hidden, cl::init(false),
|
|
cl::desc("Enable the \"global\" instruction selector"));
|
|
|
|
void LLVMTargetMachine::initAsmInfo() {
|
|
MRI = TheTarget.createMCRegInfo(getTargetTriple().str());
|
|
MII = 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 = TheTarget.createMCSubtargetInfo(getTargetTriple().str(), getTargetCPU(),
|
|
getTargetFeatureString());
|
|
|
|
MCAsmInfo *TmpAsmInfo =
|
|
TheTarget.createMCAsmInfo(*MRI, getTargetTriple().str());
|
|
// 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);
|
|
|
|
if (Options.CompressDebugSections)
|
|
TmpAsmInfo->setCompressDebugSections(DebugCompressionType::DCT_ZlibGnu);
|
|
|
|
TmpAsmInfo->setRelaxELFRelocations(Options.RelaxELFRelocations);
|
|
|
|
if (Options.ExceptionModel != ExceptionHandling::None)
|
|
TmpAsmInfo->setExceptionsType(Options.ExceptionModel);
|
|
|
|
AsmInfo = TmpAsmInfo;
|
|
}
|
|
|
|
LLVMTargetMachine::LLVMTargetMachine(const Target &T,
|
|
StringRef DataLayoutString,
|
|
const Triple &TT, StringRef CPU,
|
|
StringRef FS, TargetOptions Options,
|
|
Reloc::Model RM, CodeModel::Model CM,
|
|
CodeGenOpt::Level OL)
|
|
: TargetMachine(T, DataLayoutString, TT, CPU, FS, Options) {
|
|
T.adjustCodeGenOpts(TT, RM, CM);
|
|
this->RM = RM;
|
|
this->CMModel = CM;
|
|
this->OptLevel = OL;
|
|
}
|
|
|
|
TargetIRAnalysis LLVMTargetMachine::getTargetIRAnalysis() {
|
|
return TargetIRAnalysis([this](const Function &F) {
|
|
return TargetTransformInfo(BasicTTIImpl(this, F));
|
|
});
|
|
}
|
|
|
|
/// addPassesToX helper drives creation and initialization of TargetPassConfig.
|
|
static MCContext *
|
|
addPassesToGenerateCode(LLVMTargetMachine *TM, PassManagerBase &PM,
|
|
bool DisableVerify, AnalysisID StartBefore,
|
|
AnalysisID StartAfter, AnalysisID StopBefore,
|
|
AnalysisID StopAfter,
|
|
MachineFunctionInitializer *MFInitializer = nullptr) {
|
|
|
|
// When in emulated TLS mode, add the LowerEmuTLS pass.
|
|
if (TM->Options.EmulatedTLS)
|
|
PM.add(createLowerEmuTLSPass(TM));
|
|
|
|
PM.add(createPreISelIntrinsicLoweringPass());
|
|
|
|
// Add internal analysis passes from the target machine.
|
|
PM.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
|
|
|
|
// Targets may override createPassConfig to provide a target-specific
|
|
// subclass.
|
|
TargetPassConfig *PassConfig = TM->createPassConfig(PM);
|
|
PassConfig->setStartStopPasses(StartBefore, StartAfter, StopBefore,
|
|
StopAfter);
|
|
|
|
// Set PassConfig options provided by TargetMachine.
|
|
PassConfig->setDisableVerify(DisableVerify);
|
|
|
|
PM.add(PassConfig);
|
|
|
|
PassConfig->addIRPasses();
|
|
|
|
PassConfig->addCodeGenPrepare();
|
|
|
|
PassConfig->addPassesToHandleExceptions();
|
|
|
|
PassConfig->addISelPrepare();
|
|
|
|
MachineModuleInfo *MMI = new MachineModuleInfo(TM);
|
|
MMI->setMachineFunctionInitializer(MFInitializer);
|
|
PM.add(MMI);
|
|
|
|
// Enable FastISel with -fast, but allow that to be overridden.
|
|
TM->setO0WantsFastISel(EnableFastISelOption != cl::BOU_FALSE);
|
|
if (EnableFastISelOption == cl::BOU_TRUE ||
|
|
(TM->getOptLevel() == CodeGenOpt::None &&
|
|
TM->getO0WantsFastISel()))
|
|
TM->setFastISel(true);
|
|
|
|
// Ask the target for an isel.
|
|
if (LLVM_UNLIKELY(EnableGlobalISel)) {
|
|
if (PassConfig->addIRTranslator())
|
|
return nullptr;
|
|
|
|
PassConfig->addPreLegalizeMachineIR();
|
|
|
|
if (PassConfig->addLegalizeMachineIR())
|
|
return nullptr;
|
|
|
|
// Before running the register bank selector, ask the target if it
|
|
// wants to run some passes.
|
|
PassConfig->addPreRegBankSelect();
|
|
|
|
if (PassConfig->addRegBankSelect())
|
|
return nullptr;
|
|
|
|
PassConfig->addPreGlobalInstructionSelect();
|
|
|
|
if (PassConfig->addGlobalInstructionSelect())
|
|
return nullptr;
|
|
|
|
// Pass to reset the MachineFunction if the ISel failed.
|
|
PM.add(createResetMachineFunctionPass(
|
|
PassConfig->reportDiagnosticWhenGlobalISelFallback()));
|
|
|
|
// Provide a fallback path when we do not want to abort on
|
|
// not-yet-supported input.
|
|
if (LLVM_UNLIKELY(!PassConfig->isGlobalISelAbortEnabled()) &&
|
|
PassConfig->addInstSelector())
|
|
return nullptr;
|
|
|
|
} else if (PassConfig->addInstSelector())
|
|
return nullptr;
|
|
|
|
PassConfig->addMachinePasses();
|
|
|
|
PassConfig->setInitialized();
|
|
|
|
return &MMI->getContext();
|
|
}
|
|
|
|
bool LLVMTargetMachine::addPassesToEmitFile(
|
|
PassManagerBase &PM, raw_pwrite_stream &Out, CodeGenFileType FileType,
|
|
bool DisableVerify, AnalysisID StartBefore, AnalysisID StartAfter,
|
|
AnalysisID StopBefore, AnalysisID StopAfter,
|
|
MachineFunctionInitializer *MFInitializer) {
|
|
// Add common CodeGen passes.
|
|
MCContext *Context =
|
|
addPassesToGenerateCode(this, PM, DisableVerify, StartBefore, StartAfter,
|
|
StopBefore, StopAfter, MFInitializer);
|
|
if (!Context)
|
|
return true;
|
|
|
|
if (StopBefore || StopAfter) {
|
|
PM.add(createPrintMIRPass(Out));
|
|
return false;
|
|
}
|
|
|
|
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.
|
|
MCCodeEmitter *MCE = nullptr;
|
|
if (Options.MCOptions.ShowMCEncoding)
|
|
MCE = getTarget().createMCCodeEmitter(MII, MRI, *Context);
|
|
|
|
MCAsmBackend *MAB =
|
|
getTarget().createMCAsmBackend(MRI, getTargetTriple().str(), TargetCPU,
|
|
Options.MCOptions);
|
|
auto FOut = llvm::make_unique<formatted_raw_ostream>(Out);
|
|
MCStreamer *S = getTarget().createAsmStreamer(
|
|
*Context, std::move(FOut), Options.MCOptions.AsmVerbose,
|
|
Options.MCOptions.MCUseDwarfDirectory, InstPrinter, MCE, 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(MRI, getTargetTriple().str(), TargetCPU,
|
|
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, *MAB, Out, 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);
|
|
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.
|
|
Ctx = addPassesToGenerateCode(this, PM, DisableVerify, nullptr, nullptr,
|
|
nullptr, nullptr);
|
|
if (!Ctx)
|
|
return true;
|
|
|
|
if (Options.MCOptions.MCSaveTempLabels)
|
|
Ctx->setAllowTemporaryLabels(false);
|
|
|
|
// Create the code emitter for the target if it exists. If not, .o file
|
|
// emission fails.
|
|
const MCRegisterInfo &MRI = *getMCRegisterInfo();
|
|
MCCodeEmitter *MCE =
|
|
getTarget().createMCCodeEmitter(*getMCInstrInfo(), MRI, *Ctx);
|
|
MCAsmBackend *MAB =
|
|
getTarget().createMCAsmBackend(MRI, getTargetTriple().str(), TargetCPU,
|
|
Options.MCOptions);
|
|
if (!MCE || !MAB)
|
|
return true;
|
|
|
|
const Triple &T = getTargetTriple();
|
|
const MCSubtargetInfo &STI = *getMCSubtargetInfo();
|
|
std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
|
|
T, *Ctx, *MAB, Out, 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!
|
|
}
|