X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FLLVMTargetMachine.cpp;h=5954f62da954ec823d95421387b05f29dc9ac1f2;hb=d643486058dcece4d35f4855e8d39e6f85b24cbe;hp=40e015067f47e5522d37056782ce9cf7820f2056;hpb=00a99a35840451a291eb61a192a750908a4073ae;p=oota-llvm.git diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp index 40e015067f4..5954f62da95 100644 --- a/lib/CodeGen/LLVMTargetMachine.cpp +++ b/lib/CodeGen/LLVMTargetMachine.cpp @@ -13,15 +13,16 @@ #include "llvm/Target/TargetMachine.h" #include "llvm/PassManager.h" -#include "llvm/Pass.h" +#include "llvm/Analysis/Verifier.h" #include "llvm/Assembly/PrintModulePass.h" #include "llvm/CodeGen/AsmPrinter.h" -#include "llvm/CodeGen/Passes.h" -#include "llvm/CodeGen/GCStrategy.h" #include "llvm/CodeGen/MachineFunctionAnalysis.h" +#include "llvm/CodeGen/MachineModuleInfo.h" +#include "llvm/CodeGen/GCStrategy.h" +#include "llvm/CodeGen/Passes.h" +#include "llvm/Target/TargetLowering.h" #include "llvm/Target/TargetOptions.h" #include "llvm/MC/MCAsmInfo.h" -#include "llvm/MC/MCContext.h" #include "llvm/MC/MCStreamer.h" #include "llvm/Target/TargetData.h" #include "llvm/Target/TargetRegistry.h" @@ -30,6 +31,7 @@ #include "llvm/Support/CommandLine.h" #include "llvm/Support/Debug.h" #include "llvm/Support/FormattedStream.h" +#include "llvm/Support/StandardPasses.h" using namespace llvm; namespace llvm { @@ -50,6 +52,9 @@ static cl::opt DisableSSC("disable-ssc", cl::Hidden, cl::desc("Disable Stack Slot Coloring")); static cl::opt DisableMachineLICM("disable-machine-licm", cl::Hidden, cl::desc("Disable Machine LICM")); +static cl::opt DisablePostRAMachineLICM("disable-postra-machine-licm", + cl::Hidden, + cl::desc("Disable Machine LICM")); static cl::opt DisableMachineSink("disable-machine-sink", cl::Hidden, cl::desc("Disable Machine Sinking")); static cl::opt DisableLSR("disable-lsr", cl::Hidden, @@ -62,6 +67,12 @@ static cl::opt PrintISelInput("print-isel-input", cl::Hidden, cl::desc("Print LLVM IR input to isel pass")); static cl::opt PrintGCInfo("print-gc", cl::Hidden, cl::desc("Dump garbage collector data")); +static cl::opt ShowMCEncoding("show-mc-encoding", cl::Hidden, + cl::desc("Show encoding in .s output")); +static cl::opt ShowMCInst("show-mc-inst", cl::Hidden, + cl::desc("Show instruction structure in .s output")); +static cl::opt EnableMCLogging("enable-mc-api-logging", cl::Hidden, + cl::desc("Enable MC API logging")); static cl::opt VerifyMachineCode("verify-machineinstrs", cl::Hidden, cl::desc("Verify generated machine code"), cl::init(getenv("LLVM_VERIFY_MACHINEINSTRS")!=NULL)); @@ -76,7 +87,7 @@ static bool getVerboseAsm() { case cl::BOU_UNSET: return TargetMachine::getAsmVerbosityDefault(); case cl::BOU_TRUE: return true; case cl::BOU_FALSE: return false; - } + } } // Enable or disable FastISel. Both options are needed, because @@ -93,91 +104,105 @@ static cl::opt EnableSplitGEPGVN("split-gep-gvn", cl::Hidden, cl::desc("Split GEPs and run no-load GVN")); LLVMTargetMachine::LLVMTargetMachine(const Target &T, - const std::string &TargetTriple) - : TargetMachine(T) { + const std::string &Triple) + : TargetMachine(T), TargetTriple(Triple) { AsmInfo = T.createAsmInfo(TargetTriple); } // Set the default code model for the JIT for a generic target. // FIXME: Is small right here? or .is64Bit() ? Large : Small? -void -LLVMTargetMachine::setCodeModelForJIT() { +void LLVMTargetMachine::setCodeModelForJIT() { setCodeModel(CodeModel::Small); } // Set the default code model for static compilation for a generic target. -void -LLVMTargetMachine::setCodeModelForStatic() { +void LLVMTargetMachine::setCodeModelForStatic() { setCodeModel(CodeModel::Small); } bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM, formatted_raw_ostream &Out, CodeGenFileType FileType, - CodeGenOpt::Level OptLevel) { + CodeGenOpt::Level OptLevel, + bool DisableVerify) { // Add common CodeGen passes. - if (addCommonCodeGenPasses(PM, OptLevel)) + MCContext *Context = 0; + if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Context)) return true; + assert(Context != 0 && "Failed to get MCContext"); - OwningPtr Context(new MCContext()); + const MCAsmInfo &MAI = *getMCAsmInfo(); OwningPtr AsmStreamer; - formatted_raw_ostream *LegacyOutput; switch (FileType) { default: return true; case CGFT_AssemblyFile: { - const MCAsmInfo &MAI = *getMCAsmInfo(); MCInstPrinter *InstPrinter = - getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, Out); - AsmStreamer.reset(createAsmStreamer(*Context, Out, MAI, + getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI); + + // Create a code emitter if asked to show the encoding. + MCCodeEmitter *MCE = 0; + if (ShowMCEncoding) + MCE = getTarget().createCodeEmitter(*this, *Context); + + const TargetLoweringObjectFile &TLOF = + getTargetLowering()->getObjFileLowering(); + int PointerSize = getTargetData()->getPointerSize(); + + MCStreamer *S; + if (hasMCUseLoc()) + S = getTarget().createAsmStreamer(*Context, Out, getTargetData()->isLittleEndian(), - getVerboseAsm(), InstPrinter, - /*codeemitter*/0)); - // Set the AsmPrinter's "O" to the output file. - LegacyOutput = &Out; + getVerboseAsm(), + InstPrinter, + MCE, + ShowMCInst); + else + S = createAsmStreamerNoLoc(*Context, Out, + getTargetData()->isLittleEndian(), + getVerboseAsm(), + &TLOF, + PointerSize, + InstPrinter, + MCE, + 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().createCodeEmitter(*this); - if (MCE == 0) + MCCodeEmitter *MCE = getTarget().createCodeEmitter(*this, *Context); + TargetAsmBackend *TAB = getTarget().createAsmBackend(TargetTriple); + if (MCE == 0 || TAB == 0) return true; - - AsmStreamer.reset(createMachOStreamer(*Context, Out, MCE)); - - // Any output to the asmprinter's "O" stream is bad and needs to be fixed, - // force it to come out stderr. - // FIXME: this is horrible and leaks, eventually remove the raw_ostream from - // asmprinter. - LegacyOutput = new formatted_raw_ostream(errs()); + + AsmStreamer.reset(getTarget().createObjectStreamer(TargetTriple, *Context, + *TAB, Out, MCE, + hasMCRelaxAll())); + AsmStreamer.get()->InitSections(); break; } case CGFT_Null: // The Null output is intended for use for performance analysis and testing, // not real users. AsmStreamer.reset(createNullStreamer(*Context)); - // Any output to the asmprinter's "O" stream is bad and needs to be fixed, - // force it to come out stderr. - // FIXME: this is horrible and leaks, eventually remove the raw_ostream from - // asmprinter. - LegacyOutput = new formatted_raw_ostream(errs()); break; } - - // Create the AsmPrinter, which takes ownership of Context and AsmStreamer - // if successful. - FunctionPass *Printer = - getTarget().createAsmPrinter(*LegacyOutput, *this, *Context, *AsmStreamer, - getMCAsmInfo()); + + if (EnableMCLogging) + AsmStreamer.reset(createLoggingStreamer(AsmStreamer.take(), errs())); + + // Create the AsmPrinter, which takes ownership of AsmStreamer if successful. + FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer); if (Printer == 0) return true; - - // If successful, createAsmPrinter took ownership of AsmStreamer and Context. - Context.take(); AsmStreamer.take(); - + + // If successful, createAsmPrinter took ownership of AsmStreamer. + AsmStreamer.take(); + PM.add(Printer); - + // Make sure the code model is set. setCodeModelForStatic(); PM.add(createGCInfoDeleter()); @@ -192,12 +217,14 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM, /// bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM, JITCodeEmitter &JCE, - CodeGenOpt::Level OptLevel) { + CodeGenOpt::Level OptLevel, + bool DisableVerify) { // Make sure the code model is set. setCodeModelForJIT(); - + // Add common CodeGen passes. - if (addCommonCodeGenPasses(PM, OptLevel)) + MCContext *Ctx = 0; + if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Ctx)) return true; addCodeEmitter(PM, OptLevel, JCE); @@ -206,27 +233,59 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM, return false; // success! } +/// 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, + CodeGenOpt::Level OptLevel, + bool DisableVerify) { + // Add common CodeGen passes. + if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Ctx)) + return true; + // Make sure the code model is set. + setCodeModelForJIT(); + + return false; // success! +} + +static void printNoVerify(PassManagerBase &PM, const char *Banner) { + if (PrintMachineCode) + PM.add(createMachineFunctionPrinterPass(dbgs(), Banner)); +} + static void printAndVerify(PassManagerBase &PM, - const char *Banner, - bool allowDoubleDefs = false) { + const char *Banner) { if (PrintMachineCode) PM.add(createMachineFunctionPrinterPass(dbgs(), Banner)); if (VerifyMachineCode) - PM.add(createMachineVerifierPass(allowDoubleDefs)); + PM.add(createMachineVerifierPass()); } /// addCommonCodeGenPasses - Add standard LLVM codegen passes used for both /// emitting to assembly files or machine code output. /// bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, - CodeGenOpt::Level OptLevel) { + CodeGenOpt::Level OptLevel, + bool DisableVerify, + MCContext *&OutContext) { // Standard LLVM-Level Passes. + // Basic AliasAnalysis support. + createStandardAliasAnalysisPasses(&PM); + + // Before running any passes, run the verifier to determine if the input + // coming from the front-end and/or optimizer is valid. + if (!DisableVerify) + PM.add(createVerifierPass()); + // Optionally, tun split-GEPs and no-load GVN. if (EnableSplitGEPGVN) { PM.add(createGEPSplitterPass()); - PM.add(createGVNPass(/*NoPRE=*/false, /*NoLoads=*/true)); + PM.add(createGVNPass(/*NoLoads=*/true)); } // Run loop strength reduction before anything else. @@ -236,10 +295,14 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, PM.add(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &dbgs())); } + PM.add(createGCLoweringPass()); + + // Make sure that no unreachable blocks are instruction selected. + PM.add(createUnreachableBlockEliminationPass()); + // Turn exception handling constructs into something the code generators can // handle. - switch (getMCAsmInfo()->getExceptionHandlingType()) - { + switch (getMCAsmInfo()->getExceptionHandlingType()) { case ExceptionHandling::SjLj: // SjLj piggy-backs on dwarf for this bit. The cleanups done apply to both // Dwarf EH prepare needs to be run after SjLj prepare. Otherwise, @@ -248,33 +311,43 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, // pad is shared by multiple invokes and is also a target of a normal // edge from elsewhere. PM.add(createSjLjEHPass(getTargetLowering())); - PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None)); - break; + // FALLTHROUGH case ExceptionHandling::Dwarf: - PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None)); + PM.add(createDwarfEHPass(this)); break; case ExceptionHandling::None: PM.add(createLowerInvokePass(getTargetLowering())); + + // The lower invoke pass may create unreachable code. Remove it. + PM.add(createUnreachableBlockEliminationPass()); break; } - PM.add(createGCLoweringPass()); - - // Make sure that no unreachable blocks are instruction selected. - PM.add(createUnreachableBlockEliminationPass()); - if (OptLevel != CodeGenOpt::None && !DisableCGP) PM.add(createCodeGenPreparePass(getTargetLowering())); PM.add(createStackProtectorPass(getTargetLowering())); + addPreISel(PM, OptLevel); + if (PrintISelInput) PM.add(createPrintFunctionPass("\n\n" "*** Final LLVM Code input to ISel ***\n", &dbgs())); + // All passes which modify the LLVM IR are now complete; run the verifier + // to ensure that the IR is valid. + if (!DisableVerify) + PM.add(createVerifierPass()); + // Standard Lower-Level Passes. + // Install a MachineModuleInfo class, which is an immutable pass that holds + // all the per-module stuff we're generating, including MCContext. + MachineModuleInfo *MMI = new MachineModuleInfo(*getMCAsmInfo()); + PM.add(MMI); + OutContext = &MMI->getContext(); // Return the MCContext specifically by-ref. + // Set up a MachineFunction for the rest of CodeGen to work on. PM.add(new MachineFunctionAnalysis(*this, OptLevel)); @@ -288,47 +361,65 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, return true; // Print the instruction selected machine code... - printAndVerify(PM, "After Instruction Selection", - /* allowDoubleDefs= */ true); + printAndVerify(PM, "After Instruction Selection"); + // Expand pseudo-instructions emitted by ISel. + PM.add(createExpandISelPseudosPass()); - // Delete dead machine instructions regardless of optimization level. - PM.add(createDeadMachineInstructionElimPass()); - printAndVerify(PM, "After codegen DCE pass", - /* allowDoubleDefs= */ true); + // Optimize PHIs before DCE: removing dead PHI cycles may make more + // instructions dead. + if (OptLevel != CodeGenOpt::None) + PM.add(createOptimizePHIsPass()); + + // If the target requests it, assign local variables to stack slots relative + // to one another and simplify frame index references where possible. + PM.add(createLocalStackSlotAllocationPass()); if (OptLevel != CodeGenOpt::None) { - PM.add(createOptimizeExtsPass()); + // With optimization, dead code should already be eliminated. However + // there is one known exception: lowered code for arguments that are only + // used by tail calls, where the tail calls reuse the incoming stack + // arguments directly (see t11 in test/CodeGen/X86/sibcall.ll). + PM.add(createDeadMachineInstructionElimPass()); + printAndVerify(PM, "After codegen DCE pass"); + if (!DisableMachineLICM) PM.add(createMachineLICMPass()); + PM.add(createMachineCSEPass()); if (!DisableMachineSink) PM.add(createMachineSinkingPass()); - printAndVerify(PM, "After MachineLICM and MachineSinking", - /* allowDoubleDefs= */ true); + printAndVerify(PM, "After Machine LICM, CSE and Sinking passes"); + + PM.add(createPeepholeOptimizerPass()); + printAndVerify(PM, "After codegen peephole optimization pass"); } // Pre-ra tail duplication. if (OptLevel != CodeGenOpt::None && !DisableEarlyTailDup) { PM.add(createTailDuplicatePass(true)); - printAndVerify(PM, "After Pre-RegAlloc TailDuplicate", - /* allowDoubleDefs= */ true); + printAndVerify(PM, "After Pre-RegAlloc TailDuplicate"); } // Run pre-ra passes. if (addPreRegAlloc(PM, OptLevel)) - printAndVerify(PM, "After PreRegAlloc passes", - /* allowDoubleDefs= */ true); + printAndVerify(PM, "After PreRegAlloc passes"); // Perform register allocation. - PM.add(createRegisterAllocator()); + PM.add(createRegisterAllocator(OptLevel)); printAndVerify(PM, "After Register Allocation"); - // Perform stack slot coloring. - if (OptLevel != CodeGenOpt::None && !DisableSSC) { + // Perform stack slot coloring and post-ra machine LICM. + if (OptLevel != CodeGenOpt::None) { // FIXME: Re-enable coloring with register when it's capable of adding // kill markers. - PM.add(createStackSlotColoringPass(false)); - printAndVerify(PM, "After StackSlotColoring"); + if (!DisableSSC) + PM.add(createStackSlotColoringPass(false)); + + // Run post-ra machine LICM to hoist reloads / remats. + if (!DisablePostRAMachineLICM) + PM.add(createMachineLICMPass(false)); + + printAndVerify(PM, "After StackSlotColoring and postra Machine LICM"); } // Run post-ra passes. @@ -355,13 +446,13 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, // Branch folding must be run after regalloc and prolog/epilog insertion. if (OptLevel != CodeGenOpt::None && !DisableBranchFold) { PM.add(createBranchFoldingPass(getEnableTailMergeDefault())); - printAndVerify(PM, "After BranchFolding"); + printNoVerify(PM, "After BranchFolding"); } // Tail duplication. if (OptLevel != CodeGenOpt::None && !DisableTailDuplicate) { PM.add(createTailDuplicatePass(false)); - printAndVerify(PM, "After TailDuplicate"); + printNoVerify(PM, "After TailDuplicate"); } PM.add(createGCMachineCodeAnalysisPass()); @@ -371,11 +462,11 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, if (OptLevel != CodeGenOpt::None && !DisableCodePlace) { PM.add(createCodePlacementOptPass()); - printAndVerify(PM, "After CodePlacementOpt"); + printNoVerify(PM, "After CodePlacementOpt"); } if (addPreEmitPass(PM, OptLevel)) - printAndVerify(PM, "After PreEmit passes"); + printNoVerify(PM, "After PreEmit passes"); return false; }