#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/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Transforms/Scalar.h"
#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 {
cl::desc("Disable Stack Slot Coloring"));
static cl::opt<bool> DisableMachineLICM("disable-machine-licm", cl::Hidden,
cl::desc("Disable Machine LICM"));
+static cl::opt<bool> DisablePostRAMachineLICM("disable-postra-machine-licm",
+ cl::Hidden,
+ cl::desc("Disable Machine LICM"));
static cl::opt<bool> DisableMachineSink("disable-machine-sink", cl::Hidden,
cl::desc("Disable Machine Sinking"));
static cl::opt<bool> DisableLSR("disable-lsr", cl::Hidden,
cl::desc("Print LLVM IR input to isel pass"));
static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden,
cl::desc("Dump garbage collector data"));
+static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
+ cl::desc("Show encoding in .s output"));
+static cl::opt<bool> ShowMCInst("show-mc-inst", cl::Hidden,
+ cl::desc("Show instruction structure in .s output"));
+static cl::opt<bool> EnableMCLogging("enable-mc-api-logging", cl::Hidden,
+ cl::desc("Enable MC API logging"));
static cl::opt<bool> VerifyMachineCode("verify-machineinstrs", cl::Hidden,
cl::desc("Verify generated machine code"),
cl::init(getenv("LLVM_VERIFY_MACHINEINSTRS")!=NULL));
-static cl::opt<bool> EnableMachineCSE("enable-machine-cse", cl::Hidden,
- cl::desc("Enable Machine CSE"));
-
static cl::opt<cl::boolOrDefault>
AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
cl::init(cl::BOU_UNSET));
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
EnableFastISelOption("fast-isel", cl::Hidden,
cl::desc("Enable the \"fast\" instruction selector"));
-// Enable or disable an experimental optimization to split GEPs
-// and run a special GVN pass which does not examine loads, in
-// an effort to factor out redundancy implicit in complex GEPs.
-static cl::opt<bool> 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);
}
CodeGenOpt::Level OptLevel,
bool DisableVerify) {
// Add common CodeGen passes.
- if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify))
+ MCContext *Context = 0;
+ if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Context))
return true;
+ assert(Context != 0 && "Failed to get MCContext");
- OwningPtr<MCContext> Context(new MCContext());
+ if (hasMCSaveTempLabels())
+ Context->setAllowTemporaryLabels(false);
+
+ const MCAsmInfo &MAI = *getMCAsmInfo();
OwningPtr<MCStreamer> 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,
- getTargetData()->isLittleEndian(),
- getVerboseAsm(), InstPrinter,
- /*codeemitter*/0));
- // Set the AsmPrinter's "O" to the output file.
- LegacyOutput = &Out;
+ getTarget().createMCInstPrinter(*this, MAI.getAssemblerDialect(), MAI);
+
+ // Create a code emitter if asked to show the encoding.
+ MCCodeEmitter *MCE = 0;
+ TargetAsmBackend *TAB = 0;
+ if (ShowMCEncoding) {
+ MCE = getTarget().createCodeEmitter(*this, *Context);
+ TAB = getTarget().createAsmBackend(TargetTriple);
+ }
+
+ MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
+ getVerboseAsm(),
+ hasMCUseLoc(),
+ InstPrinter,
+ MCE, TAB,
+ 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, *Context);
- if (MCE == 0)
+ 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(),
+ hasMCNoExecStack()));
+ 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());
bool DisableVerify) {
// Make sure the code model is set.
setCodeModelForJIT();
-
+
// Add common CodeGen passes.
- if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify))
+ MCContext *Ctx = 0;
+ if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Ctx))
return true;
addCodeEmitter(PM, OptLevel, JCE);
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,
+ raw_ostream &Out,
+ CodeGenOpt::Level OptLevel,
+ bool DisableVerify) {
+ // Add common CodeGen passes.
+ if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Ctx))
+ return true;
+
+ if (hasMCSaveTempLabels())
+ Ctx->setAllowTemporaryLabels(false);
+
+ // Create the code emitter for the target if it exists. If not, .o file
+ // emission fails.
+ MCCodeEmitter *MCE = getTarget().createCodeEmitter(*this, *Ctx);
+ TargetAsmBackend *TAB = getTarget().createAsmBackend(TargetTriple);
+ if (MCE == 0 || TAB == 0)
+ return true;
+
+ OwningPtr<MCStreamer> AsmStreamer;
+ AsmStreamer.reset(getTarget().createObjectStreamer(TargetTriple, *Ctx,
+ *TAB, Out, MCE,
+ hasMCRelaxAll(),
+ hasMCNoExecStack()));
+ AsmStreamer.get()->InitSections();
+
+ // 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.
+ AsmStreamer.take();
+
+ PM.add(Printer);
+
+ // 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(Banner));
}
/// addCommonCodeGenPasses - Add standard LLVM codegen passes used for both
///
bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
CodeGenOpt::Level OptLevel,
- bool DisableVerify) {
+ 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(/*NoLoads=*/true));
- }
-
// Run loop strength reduction before anything else.
if (OptLevel != CodeGenOpt::None && !DisableLSR) {
PM.add(createLoopStrengthReducePass(getTargetLowering()));
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,
// 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;
- case ExceptionHandling::Dwarf:
- PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None));
+ // FALLTHROUGH
+ case ExceptionHandling::DwarfCFI:
+ case ExceptionHandling::DwarfTable:
+ case ExceptionHandling::ARM:
+ 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",
// 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.
+ TargetAsmInfo *TAI = new TargetAsmInfo(*this);
+ MachineModuleInfo *MMI = new MachineModuleInfo(*getMCAsmInfo(), TAI);
+ 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));
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());
// Optimize PHIs before DCE: removing dead PHI cycles may make more
// instructions dead.
if (OptLevel != CodeGenOpt::None)
PM.add(createOptimizePHIsPass());
- // Delete dead machine instructions regardless of optimization level.
- PM.add(createDeadMachineInstructionElimPass());
- printAndVerify(PM, "After codegen DCE pass",
- /* allowDoubleDefs= */ true);
+ // 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());
- if (EnableMachineCSE)
- PM.add(createMachineCSEPass());
+ // 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.
// 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());
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;
}
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