lib/Target/ARM/ARMTargetMachine.cpp

   1 //===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
   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 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ARMTargetMachine.h"
  14 #include "ARMTargetAsmInfo.h"
  15 #include "ARMFrameInfo.h"
  16 #include "ARM.h"
  17 #include "llvm/Module.h"
  18 #include "llvm/PassManager.h"
  19 #include "llvm/CodeGen/Passes.h"
  20 #include "llvm/Support/CommandLine.h"
  21 #include "llvm/Support/raw_ostream.h"
  22 #include "llvm/Target/TargetMachineRegistry.h"
  23 #include "llvm/Target/TargetOptions.h"
  24 using namespace llvm;
  25
  26 static cl::opt<bool> DisableLdStOpti("disable-arm-loadstore-opti", cl::Hidden,
  27                               cl::desc("Disable load store optimization pass"));
  28 static cl::opt<bool> DisableIfConversion("disable-arm-if-conversion",cl::Hidden,
  29                               cl::desc("Disable if-conversion pass"));
  30
  31 /// ARMTargetMachineModule - Note that this is used on hosts that cannot link
  32 /// in a library unless there are references into the library.  In particular,
  33 /// it seems that it is not possible to get things to work on Win32 without
  34 /// this.  Though it is unused, do not remove it.
  35 extern "C" int ARMTargetMachineModule;
  36 int ARMTargetMachineModule = 0;
  37
  38 // Register the target.
  39 static RegisterTarget<ARMTargetMachine>   X("arm",   "ARM");
  40 static RegisterTarget<ThumbTargetMachine> Y("thumb", "Thumb");
  41
  42 // No assembler printer by default
  43 ARMTargetMachine::AsmPrinterCtorFn ARMTargetMachine::AsmPrinterCtor = 0;
  44
  45 /// ThumbTargetMachine - Create an Thumb architecture model.
  46 ///
  47 unsigned ThumbTargetMachine::getJITMatchQuality() {
  48 #if defined(__thumb__)
  49   return 10;
  50 #endif
  51   return 0;
  52 }
  53
  54 unsigned ThumbTargetMachine::getModuleMatchQuality(const Module &M) {
  55   std::string TT = M.getTargetTriple();
  56   // Match thumb-foo-bar, as well as things like thumbv5blah-*
  57   if (TT.size() >= 6 &&
  58       (TT.substr(0, 6) == "thumb-" || TT.substr(0, 6) == "thumbv"))
  59     return 20;
  60
  61   // If the target triple is something non-thumb, we don't match.
  62   if (!TT.empty()) return 0;
  63
  64   if (M.getEndianness()  == Module::LittleEndian &&
  65       M.getPointerSize() == Module::Pointer32)
  66     return 10;                                   // Weak match
  67   else if (M.getEndianness() != Module::AnyEndianness ||
  68            M.getPointerSize() != Module::AnyPointerSize)
  69     return 0;                                    // Match for some other target
  70
  71   return getJITMatchQuality()/2;
  72 }
  73
  74 ThumbTargetMachine::ThumbTargetMachine(const Module &M, const std::string &FS)
  75   : ARMTargetMachine(M, FS, true) {
  76 }
  77
  78 /// TargetMachine ctor - Create an ARM architecture model.
  79 ///
  80 ARMTargetMachine::ARMTargetMachine(const Module &M, const std::string &FS,
  81                                    bool isThumb)
  82   : Subtarget(M, FS, isThumb),
  83     DataLayout(Subtarget.isAPCS_ABI() ?
  84                // APCS ABI
  85           (isThumb ?
  86            std::string("e-p:32:32-f64:32:32-i64:32:32-"
  87                        "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
  88            std::string("e-p:32:32-f64:32:32-i64:32:32")) :
  89                // AAPCS ABI
  90           (isThumb ?
  91            std::string("e-p:32:32-f64:64:64-i64:64:64-"
  92                        "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
  93            std::string("e-p:32:32-f64:64:64-i64:64:64"))),
  94     InstrInfo(Subtarget),
  95     FrameInfo(Subtarget),
  96     JITInfo(),
  97     TLInfo(*this) {
  98   DefRelocModel = getRelocationModel();
  99 }
 100
 101 unsigned ARMTargetMachine::getJITMatchQuality() {
 102 #if defined(__arm__)
 103   return 10;
 104 #endif
 105   return 0;
 106 }
 107
 108 unsigned ARMTargetMachine::getModuleMatchQuality(const Module &M) {
 109   std::string TT = M.getTargetTriple();
 110   // Match arm-foo-bar, as well as things like armv5blah-*
 111   if (TT.size() >= 4 &&
 112       (TT.substr(0, 4) == "arm-" || TT.substr(0, 4) == "armv"))
 113     return 20;
 114   // If the target triple is something non-arm, we don't match.
 115   if (!TT.empty()) return 0;
 116
 117   if (M.getEndianness()  == Module::LittleEndian &&
 118       M.getPointerSize() == Module::Pointer32)
 119     return 10;                                   // Weak match
 120   else if (M.getEndianness() != Module::AnyEndianness ||
 121            M.getPointerSize() != Module::AnyPointerSize)
 122     return 0;                                    // Match for some other target
 123
 124   return getJITMatchQuality()/2;
 125 }
 126
 127
 128 const TargetAsmInfo *ARMTargetMachine::createTargetAsmInfo() const {
 129   switch (Subtarget.TargetType) {
 130    case ARMSubtarget::isDarwin:
 131     return new ARMDarwinTargetAsmInfo(*this);
 132    case ARMSubtarget::isELF:
 133     return new ARMELFTargetAsmInfo(*this);
 134    default:
 135     return new ARMGenericTargetAsmInfo(*this);
 136   }
 137 }
 138
 139
 140 // Pass Pipeline Configuration
 141 bool ARMTargetMachine::addInstSelector(PassManagerBase &PM,
 142                                        CodeGenOpt::Level OptLevel) {
 143   PM.add(createARMISelDag(*this));
 144   return false;
 145 }
 146
 147 bool ARMTargetMachine::addPreEmitPass(PassManagerBase &PM,
 148                                       CodeGenOpt::Level OptLevel) {
 149   // FIXME: temporarily disabling load / store optimization pass for Thumb mode.
 150   if (OptLevel != CodeGenOpt::None && !DisableLdStOpti && !Subtarget.isThumb())
 151     PM.add(createARMLoadStoreOptimizationPass());
 152
 153   if (OptLevel != CodeGenOpt::None &&
 154       !DisableIfConversion && !Subtarget.isThumb())
 155     PM.add(createIfConverterPass());
 156
 157   PM.add(createARMConstantIslandPass());
 158   return true;
 159 }
 160
 161 bool ARMTargetMachine::addAssemblyEmitter(PassManagerBase &PM,
 162                                           CodeGenOpt::Level OptLevel,
 163                                           bool Verbose,
 164                                           raw_ostream &Out) {
 165   // Output assembly language.
 166   assert(AsmPrinterCtor && "AsmPrinter was not linked in");
 167   if (AsmPrinterCtor)
 168     PM.add(AsmPrinterCtor(Out, *this, OptLevel, Verbose));
 169
 170   return false;
 171 }
 172
 173
 174 bool ARMTargetMachine::addCodeEmitter(PassManagerBase &PM,
 175                                       CodeGenOpt::Level OptLevel,
 176                                       bool DumpAsm,
 177                                       MachineCodeEmitter &MCE) {
 178   // FIXME: Move this to TargetJITInfo!
 179   if (DefRelocModel == Reloc::Default)
 180     setRelocationModel(Reloc::Static);
 181
 182   // Machine code emitter pass for ARM.
 183   PM.add(createARMCodeEmitterPass(*this, MCE));
 184   if (DumpAsm) {
 185     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
 186     if (AsmPrinterCtor)
 187       PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
 188   }
 189
 190   return false;
 191 }
 192
 193 bool ARMTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 194                                             CodeGenOpt::Level OptLevel,
 195                                             bool DumpAsm,
 196                                             MachineCodeEmitter &MCE) {
 197   // Machine code emitter pass for ARM.
 198   PM.add(createARMCodeEmitterPass(*this, MCE));
 199   if (DumpAsm) {
 200     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
 201     if (AsmPrinterCtor)
 202       PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
 203   }
 204
 205   return false;
 206 }