lib/CodeGen/LLVMTargetMachine.cpp

   1 //===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the LLVMTargetMachine class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Target/TargetMachine.h"
  15 #include "llvm/PassManager.h"
  16 #include "llvm/CodeGen/AsmPrinter.h"
  17 #include "llvm/CodeGen/Passes.h"
  18 #include "llvm/Target/TargetOptions.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/MC/MCContext.h"
  21 #include "llvm/MC/MCInstrInfo.h"
  22 #include "llvm/MC/MCStreamer.h"
  23 #include "llvm/MC/MCSubtargetInfo.h"
  24 #include "llvm/Target/TargetInstrInfo.h"
  25 #include "llvm/Target/TargetSubtargetInfo.h"
  26 #include "llvm/ADT/OwningPtr.h"
  27 #include "llvm/Support/CommandLine.h"
  28 #include "llvm/Support/FormattedStream.h"
  29 #include "llvm/Support/ErrorHandling.h"
  30 #include "llvm/Support/TargetRegistry.h"
  31 using namespace llvm;
  32
  33 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
  34     cl::desc("Show encoding in .s output"));
  35 static cl::opt<bool> ShowMCInst("show-mc-inst", cl::Hidden,
  36     cl::desc("Show instruction structure in .s output"));
  37
  38 static cl::opt<cl::boolOrDefault>
  39 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
  40            cl::init(cl::BOU_UNSET));
  41
  42 static bool getVerboseAsm() {
  43   switch (AsmVerbose) {
  44   case cl::BOU_UNSET: return TargetMachine::getAsmVerbosityDefault();
  45   case cl::BOU_TRUE:  return true;
  46   case cl::BOU_FALSE: return false;
  47   }
  48   llvm_unreachable("Invalid verbose asm state");
  49 }
  50
  51 LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
  52                                      StringRef CPU, StringRef FS,
  53                                      TargetOptions Options,
  54                                      Reloc::Model RM, CodeModel::Model CM,
  55                                      CodeGenOpt::Level OL)
  56   : TargetMachine(T, Triple, CPU, FS, Options) {
  57   CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM, OL);
  58   AsmInfo = T.createMCAsmInfo(Triple);
  59   // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
  60   // and if the old one gets included then MCAsmInfo will be NULL and
  61   // we'll crash later.
  62   // Provide the user with a useful error message about what's wrong.
  63   assert(AsmInfo && "MCAsmInfo not initialized."
  64          "Make sure you include the correct TargetSelect.h"
  65          "and that InitializeAllTargetMCs() is being invoked!");
  66 }
  67
  68 bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
  69                                             formatted_raw_ostream &Out,
  70                                             CodeGenFileType FileType,
  71                                             bool DisableVerify) {
  72   // Add common CodeGen passes.
  73   MCContext *Context = 0;
  74   TargetPassConfig *PassConfig = createPassConfig(PM, DisableVerify);
  75   PM.add(PassConfig);
  76   if (PassConfig->addCodeGenPasses(Context))
  77     return true;
  78   assert(Context != 0 && "Failed to get MCContext");
  79
  80   if (hasMCSaveTempLabels())
  81     Context->setAllowTemporaryLabels(false);
  82
  83   const MCAsmInfo &MAI = *getMCAsmInfo();
  84   const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
  85   OwningPtr<MCStreamer> AsmStreamer;
  86
  87   switch (FileType) {
  88   case CGFT_AssemblyFile: {
  89     MCInstPrinter *InstPrinter =
  90       getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, STI);
  91
  92     // Create a code emitter if asked to show the encoding.
  93     MCCodeEmitter *MCE = 0;
  94     MCAsmBackend *MAB = 0;
  95     if (ShowMCEncoding) {
  96       const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
  97       MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), STI, *Context);
  98       MAB = getTarget().createMCAsmBackend(getTargetTriple());
  99     }
 100
 101     MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
 102                                                   getVerboseAsm(),
 103                                                   hasMCUseLoc(),
 104                                                   hasMCUseCFI(),
 105                                                   hasMCUseDwarfDirectory(),
 106                                                   InstPrinter,
 107                                                   MCE, MAB,
 108                                                   ShowMCInst);
 109     AsmStreamer.reset(S);
 110     break;
 111   }
 112   case CGFT_ObjectFile: {
 113     // Create the code emitter for the target if it exists.  If not, .o file
 114     // emission fails.
 115     MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), STI,
 116                                                          *Context);
 117     MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple());
 118     if (MCE == 0 || MAB == 0)
 119       return true;
 120
 121     AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(),
 122                                                          *Context, *MAB, Out,
 123                                                          MCE, hasMCRelaxAll(),
 124                                                          hasMCNoExecStack()));
 125     AsmStreamer.get()->InitSections();
 126     break;
 127   }
 128   case CGFT_Null:
 129     // The Null output is intended for use for performance analysis and testing,
 130     // not real users.
 131     AsmStreamer.reset(createNullStreamer(*Context));
 132     break;
 133   }
 134
 135   // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
 136   FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
 137   if (Printer == 0)
 138     return true;
 139
 140   // If successful, createAsmPrinter took ownership of AsmStreamer.
 141   AsmStreamer.take();
 142
 143   PM.add(Printer);
 144
 145   PM.add(createGCInfoDeleter());
 146   return false;
 147 }
 148
 149 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
 150 /// get machine code emitted.  This uses a JITCodeEmitter object to handle
 151 /// actually outputting the machine code and resolving things like the address
 152 /// of functions.  This method should returns true if machine code emission is
 153 /// not supported.
 154 ///
 155 bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
 156                                                    JITCodeEmitter &JCE,
 157                                                    bool DisableVerify) {
 158   // Add common CodeGen passes.
 159   MCContext *Ctx = 0;
 160   OwningPtr<TargetPassConfig> PassConfig(createPassConfig(PM, DisableVerify));
 161   if (PassConfig->addCodeGenPasses(Ctx))
 162     return true;
 163
 164   addCodeEmitter(PM, JCE);
 165   PM.add(createGCInfoDeleter());
 166
 167   return false; // success!
 168 }
 169
 170 /// addPassesToEmitMC - Add passes to the specified pass manager to get
 171 /// machine code emitted with the MCJIT. This method returns true if machine
 172 /// code is not supported. It fills the MCContext Ctx pointer which can be
 173 /// used to build custom MCStreamer.
 174 ///
 175 bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM,
 176                                           MCContext *&Ctx,
 177                                           raw_ostream &Out,
 178                                           bool DisableVerify) {
 179   // Add common CodeGen passes.
 180   OwningPtr<TargetPassConfig> PassConfig(createPassConfig(PM, DisableVerify));
 181   if (PassConfig->addCodeGenPasses(Ctx))
 182     return true;
 183
 184   if (hasMCSaveTempLabels())
 185     Ctx->setAllowTemporaryLabels(false);
 186
 187   // Create the code emitter for the target if it exists.  If not, .o file
 188   // emission fails.
 189   const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
 190   MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(),STI, *Ctx);
 191   MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple());
 192   if (MCE == 0 || MAB == 0)
 193     return true;
 194
 195   OwningPtr<MCStreamer> AsmStreamer;
 196   AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), *Ctx,
 197                                                        *MAB, Out, MCE,
 198                                                        hasMCRelaxAll(),
 199                                                        hasMCNoExecStack()));
 200   AsmStreamer.get()->InitSections();
 201
 202   // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
 203   FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
 204   if (Printer == 0)
 205     return true;
 206
 207   // If successful, createAsmPrinter took ownership of AsmStreamer.
 208   AsmStreamer.take();
 209
 210   PM.add(Printer);
 211
 212   return false; // success!
 213 }