X86TargetMachine.cpp revision 195340 
1//===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
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 defines the X86 specific subclass of TargetMachine.
11//
12//===----------------------------------------------------------------------===//
13
14#include "X86TargetAsmInfo.h"
15#include "X86TargetMachine.h"
16#include "X86.h"
17#include "llvm/Module.h"
18#include "llvm/PassManager.h"
19#include "llvm/CodeGen/MachineFunction.h"
20#include "llvm/CodeGen/Passes.h"
21#include "llvm/Support/raw_ostream.h"
22#include "llvm/Target/TargetOptions.h"
23#include "llvm/Target/TargetMachineRegistry.h"
24using namespace llvm;
25
26/// X86TargetMachineModule - Note that this is used on hosts that cannot link
27/// in a library unless there are references into the library.  In particular,
28/// it seems that it is not possible to get things to work on Win32 without
29/// this.  Though it is unused, do not remove it.
30extern "C" int X86TargetMachineModule;
31int X86TargetMachineModule = 0;
32
33// Register the target.
34static RegisterTarget<X86_32TargetMachine>
35X("x86",    "32-bit X86: Pentium-Pro and above");
36static RegisterTarget<X86_64TargetMachine>
37Y("x86-64", "64-bit X86: EM64T and AMD64");
38
39// Force static initialization.
40extern "C" void LLVMInitializeX86Target() { }
41
42// No assembler printer by default
43X86TargetMachine::AsmPrinterCtorFn X86TargetMachine::AsmPrinterCtor = 0;
44
45const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
46  if (Subtarget.isFlavorIntel())
47    return new X86WinTargetAsmInfo(*this);
48  else
49    switch (Subtarget.TargetType) {
50     case X86Subtarget::isDarwin:
51      return new X86DarwinTargetAsmInfo(*this);
52     case X86Subtarget::isELF:
53      return new X86ELFTargetAsmInfo(*this);
54     case X86Subtarget::isMingw:
55     case X86Subtarget::isCygwin:
56      return new X86COFFTargetAsmInfo(*this);
57     case X86Subtarget::isWindows:
58      return new X86WinTargetAsmInfo(*this);
59     default:
60      return new X86GenericTargetAsmInfo(*this);
61    }
62}
63
64unsigned X86_32TargetMachine::getJITMatchQuality() {
65#if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
66  return 10;
67#endif
68  return 0;
69}
70
71unsigned X86_64TargetMachine::getJITMatchQuality() {
72#if defined(__x86_64__) || defined(_M_AMD64)
73  return 10;
74#endif
75  return 0;
76}
77
78unsigned X86_32TargetMachine::getModuleMatchQuality(const Module &M) {
79  // We strongly match "i[3-9]86-*".
80  std::string TT = M.getTargetTriple();
81  if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
82      TT[4] == '-' && TT[1] - '3' < 6)
83    return 20;
84  // If the target triple is something non-X86, we don't match.
85  if (!TT.empty()) return 0;
86
87  if (M.getEndianness()  == Module::LittleEndian &&
88      M.getPointerSize() == Module::Pointer32)
89    return 10;                                   // Weak match
90  else if (M.getEndianness() != Module::AnyEndianness ||
91           M.getPointerSize() != Module::AnyPointerSize)
92    return 0;                                    // Match for some other target
93
94  return getJITMatchQuality()/2;
95}
96
97unsigned X86_64TargetMachine::getModuleMatchQuality(const Module &M) {
98  // We strongly match "x86_64-*".
99  std::string TT = M.getTargetTriple();
100  if (TT.size() >= 7 && TT[0] == 'x' && TT[1] == '8' && TT[2] == '6' &&
101      TT[3] == '_' && TT[4] == '6' && TT[5] == '4' && TT[6] == '-')
102    return 20;
103
104  // We strongly match "amd64-*".
105  if (TT.size() >= 6 && TT[0] == 'a' && TT[1] == 'm' && TT[2] == 'd' &&
106      TT[3] == '6' && TT[4] == '4' && TT[5] == '-')
107    return 20;
108
109  // If the target triple is something non-X86-64, we don't match.
110  if (!TT.empty()) return 0;
111
112  if (M.getEndianness()  == Module::LittleEndian &&
113      M.getPointerSize() == Module::Pointer64)
114    return 10;                                   // Weak match
115  else if (M.getEndianness() != Module::AnyEndianness ||
116           M.getPointerSize() != Module::AnyPointerSize)
117    return 0;                                    // Match for some other target
118
119  return getJITMatchQuality()/2;
120}
121
122X86_32TargetMachine::X86_32TargetMachine(const Module &M, const std::string &FS)
123  : X86TargetMachine(M, FS, false) {
124}
125
126
127X86_64TargetMachine::X86_64TargetMachine(const Module &M, const std::string &FS)
128  : X86TargetMachine(M, FS, true) {
129}
130
131/// X86TargetMachine ctor - Create an ILP32 architecture model
132///
133X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS,
134                                   bool is64Bit)
135  : Subtarget(M, FS, is64Bit),
136    DataLayout(Subtarget.getDataLayout()),
137    FrameInfo(TargetFrameInfo::StackGrowsDown,
138              Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
139    InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
140  DefRelocModel = getRelocationModel();
141  // FIXME: Correctly select PIC model for Win64 stuff
142  if (getRelocationModel() == Reloc::Default) {
143    if (Subtarget.isTargetDarwin() ||
144        (Subtarget.isTargetCygMing() && !Subtarget.isTargetWin64()))
145      setRelocationModel(Reloc::DynamicNoPIC);
146    else
147      setRelocationModel(Reloc::Static);
148  }
149
150  // ELF doesn't have a distinct dynamic-no-PIC model. Dynamic-no-PIC
151  // is defined as a model for code which may be used in static or
152  // dynamic executables but not necessarily a shared library. On ELF
153  // implement this by using the Static model.
154  if (Subtarget.isTargetELF() &&
155      getRelocationModel() == Reloc::DynamicNoPIC)
156    setRelocationModel(Reloc::Static);
157
158  if (Subtarget.is64Bit()) {
159    // No DynamicNoPIC support under X86-64.
160    if (getRelocationModel() == Reloc::DynamicNoPIC)
161      setRelocationModel(Reloc::PIC_);
162    // Default X86-64 code model is small.
163    if (getCodeModel() == CodeModel::Default)
164      setCodeModel(CodeModel::Small);
165  }
166
167  if (Subtarget.isTargetCygMing())
168    Subtarget.setPICStyle(PICStyles::WinPIC);
169  else if (Subtarget.isTargetDarwin()) {
170    if (Subtarget.is64Bit())
171      Subtarget.setPICStyle(PICStyles::RIPRel);
172    else
173      Subtarget.setPICStyle(PICStyles::Stub);
174  } else if (Subtarget.isTargetELF()) {
175    if (Subtarget.is64Bit())
176      Subtarget.setPICStyle(PICStyles::RIPRel);
177    else
178      Subtarget.setPICStyle(PICStyles::GOT);
179  }
180}
181
182//===----------------------------------------------------------------------===//
183// Pass Pipeline Configuration
184//===----------------------------------------------------------------------===//
185
186bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
187                                       CodeGenOpt::Level OptLevel) {
188  // Install an instruction selector.
189  PM.add(createX86ISelDag(*this, OptLevel));
190
191  // If we're using Fast-ISel, clean up the mess.
192  if (EnableFastISel)
193    PM.add(createDeadMachineInstructionElimPass());
194
195  // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
196  PM.add(createX87FPRegKillInserterPass());
197
198  return false;
199}
200
201bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
202                                      CodeGenOpt::Level OptLevel) {
203  // Calculate and set max stack object alignment early, so we can decide
204  // whether we will need stack realignment (and thus FP).
205  PM.add(createX86MaxStackAlignmentCalculatorPass());
206  return false;  // -print-machineinstr shouldn't print after this.
207}
208
209bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
210                                       CodeGenOpt::Level OptLevel) {
211  PM.add(createX86FloatingPointStackifierPass());
212  return true;  // -print-machineinstr should print after this.
213}
214
215bool X86TargetMachine::addAssemblyEmitter(PassManagerBase &PM,
216                                          CodeGenOpt::Level OptLevel,
217                                          bool Verbose,
218                                          raw_ostream &Out) {
219  // FIXME: Move this somewhere else!
220  // On Darwin, override 64-bit static relocation to pic_ since the
221  // assembler doesn't support it.
222  if (DefRelocModel == Reloc::Static &&
223      Subtarget.isTargetDarwin() && Subtarget.is64Bit() &&
224      getCodeModel() == CodeModel::Small)
225    setRelocationModel(Reloc::PIC_);
226
227  assert(AsmPrinterCtor && "AsmPrinter was not linked in");
228  if (AsmPrinterCtor)
229    PM.add(AsmPrinterCtor(Out, *this, Verbose));
230  return false;
231}
232
233bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
234                                      CodeGenOpt::Level OptLevel,
235                                      bool DumpAsm,
236                                      MachineCodeEmitter &MCE) {
237  // FIXME: Move this to TargetJITInfo!
238  // On Darwin, do not override 64-bit setting made in X86TargetMachine().
239  if (DefRelocModel == Reloc::Default &&
240        (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
241    setRelocationModel(Reloc::Static);
242
243  // 64-bit JIT places everything in the same buffer except external functions.
244  // On Darwin, use small code model but hack the call instruction for
245  // externals.  Elsewhere, do not assume globals are in the lower 4G.
246  if (Subtarget.is64Bit()) {
247    if (Subtarget.isTargetDarwin())
248      setCodeModel(CodeModel::Small);
249    else
250      setCodeModel(CodeModel::Large);
251  }
252
253  PM.add(createX86CodeEmitterPass(*this, MCE));
254  if (DumpAsm) {
255    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
256    if (AsmPrinterCtor)
257      PM.add(AsmPrinterCtor(errs(), *this, true));
258  }
259
260  return false;
261}
262
263bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
264                                      CodeGenOpt::Level OptLevel,
265                                      bool DumpAsm,
266                                      JITCodeEmitter &JCE) {
267  // FIXME: Move this to TargetJITInfo!
268  // On Darwin, do not override 64-bit setting made in X86TargetMachine().
269  if (DefRelocModel == Reloc::Default &&
270        (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
271    setRelocationModel(Reloc::Static);
272
273  // 64-bit JIT places everything in the same buffer except external functions.
274  // On Darwin, use small code model but hack the call instruction for
275  // externals.  Elsewhere, do not assume globals are in the lower 4G.
276  if (Subtarget.is64Bit()) {
277    if (Subtarget.isTargetDarwin())
278      setCodeModel(CodeModel::Small);
279    else
280      setCodeModel(CodeModel::Large);
281  }
282
283  PM.add(createX86JITCodeEmitterPass(*this, JCE));
284  if (DumpAsm) {
285    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
286    if (AsmPrinterCtor)
287      PM.add(AsmPrinterCtor(errs(), *this, true));
288  }
289
290  return false;
291}
292
293bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
294                                            CodeGenOpt::Level OptLevel,
295                                            bool DumpAsm,
296                                            MachineCodeEmitter &MCE) {
297  PM.add(createX86CodeEmitterPass(*this, MCE));
298  if (DumpAsm) {
299    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
300    if (AsmPrinterCtor)
301      PM.add(AsmPrinterCtor(errs(), *this, true));
302  }
303
304  return false;
305}
306
307bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
308                                            CodeGenOpt::Level OptLevel,
309                                            bool DumpAsm,
310                                            JITCodeEmitter &JCE) {
311  PM.add(createX86JITCodeEmitterPass(*this, JCE));
312  if (DumpAsm) {
313    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
314    if (AsmPrinterCtor)
315      PM.add(AsmPrinterCtor(errs(), *this, true));
316  }
317
318  return false;
319}
320
321