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https://github.com/c64scene-ar/llvm-6502.git
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This commit adds a new pass that can inject checks before indirect calls to make sure that these calls target known locations. It supports three types of checks and, at compile time, it can take the name of a custom function to call when an indirect call check fails. The default failure function ignores the error and continues. This pass incidentally moves the function JumpInstrTables::transformType from private to public and makes it static (with a new argument that specifies the table type to use); this is so that the CFI code can transform function types at call sites to determine which jump-instruction table to use for the check at that site. Also, this removes support for jumptables in ARM, pending further performance analysis and discussion. Review: http://reviews.llvm.org/D4167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221708 91177308-0d34-0410-b5e6-96231b3b80d8
283 lines
11 KiB
C++
283 lines
11 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/JumpInstrTableInfo.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/ForwardControlFlowIntegrity.h"
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#include "llvm/CodeGen/JumpInstrTables.h"
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#include "llvm/CodeGen/MachineFunctionAnalysis.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/IR/IRPrintingPasses.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/PassManager.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/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.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/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.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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void LLVMTargetMachine::initAsmInfo() {
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MCAsmInfo *TmpAsmInfo = TheTarget.createMCAsmInfo(
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*getSubtargetImpl()->getRegisterInfo(), getTargetTriple());
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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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if (Options.CompressDebugSections)
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TmpAsmInfo->setCompressDebugSections(true);
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AsmInfo = TmpAsmInfo;
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}
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LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
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StringRef CPU, StringRef FS,
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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, Triple, CPU, FS, Options) {
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CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM, OL);
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}
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void LLVMTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
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PM.add(createBasicTargetTransformInfoPass(this));
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}
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/// addPassesToX helper drives creation and initialization of TargetPassConfig.
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static MCContext *addPassesToGenerateCode(LLVMTargetMachine *TM,
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PassManagerBase &PM,
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bool DisableVerify,
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AnalysisID StartAfter,
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AnalysisID StopAfter) {
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// Add internal analysis passes from the target machine.
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TM->addAnalysisPasses(PM);
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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(StartAfter, 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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// Install a MachineModuleInfo class, which is an immutable pass that holds
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// all the per-module stuff we're generating, including MCContext.
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MachineModuleInfo *MMI = new MachineModuleInfo(
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*TM->getMCAsmInfo(), *TM->getSubtargetImpl()->getRegisterInfo(),
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&TM->getSubtargetImpl()->getTargetLowering()->getObjFileLowering());
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PM.add(MMI);
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// Set up a MachineFunction for the rest of CodeGen to work on.
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PM.add(new MachineFunctionAnalysis(*TM));
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// Enable FastISel with -fast, but allow that to be overridden.
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if (EnableFastISelOption == cl::BOU_TRUE ||
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(TM->getOptLevel() == CodeGenOpt::None &&
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EnableFastISelOption != cl::BOU_FALSE))
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TM->setFastISel(true);
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// Ask the target for an isel.
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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(PassManagerBase &PM,
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formatted_raw_ostream &Out,
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CodeGenFileType FileType,
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bool DisableVerify,
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AnalysisID StartAfter,
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AnalysisID StopAfter) {
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// Passes to handle jumptable function annotations. These can't be handled at
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// JIT time, so we don't add them directly to addPassesToGenerateCode.
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PM.add(createJumpInstrTableInfoPass(
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getSubtargetImpl()->getInstrInfo()->getJumpInstrTableEntryBound()));
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PM.add(createJumpInstrTablesPass(Options.JTType));
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if (Options.FCFI)
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PM.add(createForwardControlFlowIntegrityPass(
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Options.JTType, Options.CFIType, Options.CFIEnforcing,
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Options.getCFIFuncName()));
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// Add common CodeGen passes.
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MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify,
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StartAfter, StopAfter);
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if (!Context)
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return true;
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if (StopAfter) {
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// FIXME: The intent is that this should eventually write out a YAML file,
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// containing the LLVM IR, the machine-level IR (when stopping after a
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// machine-level pass), and whatever other information is needed to
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// deserialize the code and resume compilation. For now, just write the
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// LLVM IR.
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PM.add(createPrintModulePass(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 = getSubtarget<MCSubtargetInfo>();
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const MCAsmInfo &MAI = *getMCAsmInfo();
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const MCRegisterInfo &MRI = *getSubtargetImpl()->getRegisterInfo();
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const MCInstrInfo &MII = *getSubtargetImpl()->getInstrInfo();
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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 =
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getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI,
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MII, MRI, STI);
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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, STI, *Context);
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MCAsmBackend *MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(),
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TargetCPU);
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MCStreamer *S = getTarget().createAsmStreamer(
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*Context, Out, 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, STI,
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*Context);
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MCAsmBackend *MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(),
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TargetCPU);
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if (!MCE || !MAB)
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return true;
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AsmStreamer.reset(
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getTarget()
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.createMCObjectStreamer(getTargetTriple(), *Context, *MAB, Out, MCE,
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STI, Options.MCOptions.MCRelaxAll));
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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 = getTarget().createAsmPrinter(*this, *AsmStreamer);
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if (!Printer)
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return true;
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// If successful, createAsmPrinter took ownership of AsmStreamer.
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AsmStreamer.release();
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PM.add(Printer);
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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,
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MCContext *&Ctx,
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raw_ostream &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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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 = *getSubtargetImpl()->getRegisterInfo();
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const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
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MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(
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*getSubtargetImpl()->getInstrInfo(), MRI, STI, *Ctx);
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MCAsmBackend *MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(),
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TargetCPU);
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if (!MCE || !MAB)
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return true;
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std::unique_ptr<MCStreamer> AsmStreamer;
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AsmStreamer.reset(getTarget()
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.createMCObjectStreamer(getTargetTriple(), *Ctx, *MAB,
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Out, MCE, STI,
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Options.MCOptions.MCRelaxAll));
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// Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
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FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
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if (!Printer)
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return true;
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// If successful, createAsmPrinter took ownership of AsmStreamer.
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AsmStreamer.release();
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PM.add(Printer);
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return false; // success!
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}
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