#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/TargetOptions.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Transforms/Scalar.h"
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FormattedStream.h"
cl::desc("Disable branch folding"));
static cl::opt<bool> DisableTailDuplicate("disable-tail-duplicate", cl::Hidden,
cl::desc("Disable tail duplication"));
+static cl::opt<bool> DisableEarlyTailDup("disable-early-taildup", cl::Hidden,
+ cl::desc("Disable pre-register allocation tail duplication"));
static cl::opt<bool> DisableCodePlace("disable-code-place", cl::Hidden,
cl::desc("Disable code placement"));
static cl::opt<bool> DisableSSC("disable-ssc", cl::Hidden,
cl::desc("Print LLVM IR produced by the loop-reduce pass"));
static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
cl::desc("Print LLVM IR input to isel pass"));
-static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden,
- cl::desc("Dump emitter generated instructions as assembly"));
static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden,
cl::desc("Dump garbage collector data"));
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<cl::boolOrDefault>
+AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
+ cl::init(cl::BOU_UNSET));
+
+static bool getVerboseAsm() {
+ switch (AsmVerbose) {
+ default:
+ 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
// 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<bool> EnableSplitGEPGVN("split-gep-gvn", cl::Hidden,
cl::desc("Split GEPs and run no-load GVN"));
-static cl::opt<bool> PreAllocTailDup("pre-regalloc-taildup", cl::Hidden,
- cl::desc("Pre-register allocation tail duplication"));
-
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);
}
-FileModel::Model
-LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
- formatted_raw_ostream &Out,
- CodeGenFileType FileType,
- CodeGenOpt::Level OptLevel) {
+bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
+ formatted_raw_ostream &Out,
+ CodeGenFileType FileType,
+ CodeGenOpt::Level OptLevel,
+ bool DisableVerify) {
// Add common CodeGen passes.
- if (addCommonCodeGenPasses(PM, OptLevel))
- return FileModel::Error;
+ MCContext *Context = 0;
+ if (addCommonCodeGenPasses(PM, OptLevel, DisableVerify, Context))
+ return true;
+ assert(Context != 0 && "Failed to get MCContext");
+
+ const MCAsmInfo &MAI = *getMCAsmInfo();
+ OwningPtr<MCStreamer> AsmStreamer;
switch (FileType) {
- default:
+ default: return true;
+ case CGFT_AssemblyFile: {
+ MCInstPrinter *InstPrinter =
+ getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI);
+ AsmStreamer.reset(createAsmStreamer(*Context, Out,
+ getTargetData()->isLittleEndian(),
+ getVerboseAsm(), InstPrinter,
+ /*codeemitter*/0));
break;
- case TargetMachine::AssemblyFile:
- if (addAssemblyEmitter(PM, OptLevel, getAsmVerbosityDefault(), Out))
- return FileModel::Error;
- return FileModel::AsmFile;
- case TargetMachine::ObjectFile:
- if (getMachOWriterInfo())
- return FileModel::MachOFile;
- else if (getELFWriterInfo())
- return FileModel::ElfFile;
}
-
- return FileModel::Error;
-}
-
-bool LLVMTargetMachine::addAssemblyEmitter(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel,
- bool Verbose,
- formatted_raw_ostream &Out) {
- FunctionPass *Printer =
- getTarget().createAsmPrinter(Out, *this, getMCAsmInfo(), Verbose);
- if (!Printer)
+ 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);
+ TargetAsmBackend *TAB = getTarget().createAsmBackend(TargetTriple);
+ if (MCE == 0 || TAB == 0)
+ return true;
+
+ AsmStreamer.reset(createMachOStreamer(*Context, *TAB, Out, MCE));
+ break;
+ }
+ case CGFT_Null:
+ // The Null output is intended for use for performance analysis and testing,
+ // not real users.
+ AsmStreamer.reset(createNullStreamer(*Context));
+ break;
+ }
+
+ // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
+ FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
+ if (Printer == 0)
return true;
-
- PM.add(Printer);
- return false;
-}
-
-/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
-/// be split up (e.g., to add an object writer pass), this method can be used to
-/// finish up adding passes to emit the file, if necessary.
-bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
- MachineCodeEmitter *MCE,
- CodeGenOpt::Level OptLevel) {
- // Make sure the code model is set.
- setCodeModelForStatic();
- if (MCE)
- addSimpleCodeEmitter(PM, OptLevel, *MCE);
- if (PrintEmittedAsm)
- addAssemblyEmitter(PM, OptLevel, true, ferrs());
-
- PM.add(createGCInfoDeleter());
-
- return false; // success!
-}
-
-/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
-/// be split up (e.g., to add an object writer pass), this method can be used to
-/// finish up adding passes to emit the file, if necessary.
-bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
- JITCodeEmitter *JCE,
- CodeGenOpt::Level OptLevel) {
- // Make sure the code model is set.
- setCodeModelForJIT();
+ // If successful, createAsmPrinter took ownership of AsmStreamer.
+ AsmStreamer.take();
- if (JCE)
- addSimpleCodeEmitter(PM, OptLevel, *JCE);
- if (PrintEmittedAsm)
- addAssemblyEmitter(PM, OptLevel, true, ferrs());
-
- PM.add(createGCInfoDeleter());
-
- return false; // success!
-}
-
-/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
-/// be split up (e.g., to add an object writer pass), this method can be used to
-/// finish up adding passes to emit the file, if necessary.
-bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
- ObjectCodeEmitter *OCE,
- CodeGenOpt::Level OptLevel) {
- // Make sure the code model is set.
- setCodeModelForStatic();
+ PM.add(Printer);
- if (OCE)
- addSimpleCodeEmitter(PM, OptLevel, *OCE);
- if (PrintEmittedAsm)
- addAssemblyEmitter(PM, OptLevel, true, ferrs());
-
- PM.add(createGCInfoDeleter());
-
- return false; // success!
-}
-
-/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
-/// get machine code emitted. This uses a MachineCodeEmitter object to handle
-/// actually outputting the machine code and resolving things like the address
-/// of functions. This method should returns true if machine code emission is
-/// not supported.
-///
-bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
- MachineCodeEmitter &MCE,
- CodeGenOpt::Level OptLevel) {
// Make sure the code model is set.
- setCodeModelForJIT();
-
- // Add common CodeGen passes.
- if (addCommonCodeGenPasses(PM, OptLevel))
- return true;
-
- addCodeEmitter(PM, OptLevel, MCE);
- if (PrintEmittedAsm)
- addAssemblyEmitter(PM, OptLevel, true, ferrs());
-
+ setCodeModelForStatic();
PM.add(createGCInfoDeleter());
-
- return false; // success!
+ return false;
}
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
-/// get machine code emitted. This uses a MachineCodeEmitter object to handle
+/// get machine code emitted. This uses a JITCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
/// of functions. This method should returns true if machine code emission is
/// not supported.
///
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);
- if (PrintEmittedAsm)
- addAssemblyEmitter(PM, OptLevel, true, ferrs());
-
PM.add(createGCInfoDeleter());
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) {
/// 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.
+ // 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.
// 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
- PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None));
+ // Dwarf EH prepare needs to be run after SjLj prepare. Otherwise,
+ // catch info can get misplaced when a selector ends up more than one block
+ // removed from the parent invoke(s). This could happen when a landing
+ // 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));
"*** 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));
printAndVerify(PM, "After Instruction Selection",
/* allowDoubleDefs= */ true);
+ // 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 (OptLevel != CodeGenOpt::None) {
+ PM.add(createOptimizeExtsPass());
if (!DisableMachineLICM)
PM.add(createMachineLICMPass());
+ PM.add(createMachineCSEPass());
if (!DisableMachineSink)
PM.add(createMachineSinkingPass());
- printAndVerify(PM, "After MachineLICM and MachineSinking",
+ printAndVerify(PM, "After Machine LICM, CSE and Sinking passes",
/* allowDoubleDefs= */ true);
}
// Pre-ra tail duplication.
- if (OptLevel != CodeGenOpt::None &&
- !DisableTailDuplicate && PreAllocTailDup) {
+ if (OptLevel != CodeGenOpt::None && !DisableEarlyTailDup) {
PM.add(createTailDuplicatePass(true));
printAndVerify(PM, "After Pre-RegAlloc TailDuplicate",
/* allowDoubleDefs= */ true);
// 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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