1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the X86 specific subclass of TargetMachine.
12 //===----------------------------------------------------------------------===//
14 #include "X86MCAsmInfo.h"
15 #include "X86TargetMachine.h"
17 #include "llvm/PassManager.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/Passes.h"
20 #include "llvm/MC/MCCodeEmitter.h"
21 #include "llvm/MC/MCStreamer.h"
22 #include "llvm/Support/FormattedStream.h"
23 #include "llvm/Target/TargetOptions.h"
24 #include "llvm/Target/TargetRegistry.h"
27 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
29 switch (TheTriple.getOS()) {
31 return new X86MCAsmInfoDarwin(TheTriple);
36 return new X86MCAsmInfoCOFF(TheTriple);
38 return new X86ELFMCAsmInfo(TheTriple);
42 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
43 MCContext &Ctx, TargetAsmBackend &TAB,
45 MCCodeEmitter *_Emitter,
48 switch (TheTriple.getOS()) {
50 return createMachOStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll);
55 return createWinCOFFStreamer(Ctx, TAB, *_Emitter, _OS, RelaxAll);
57 return createELFStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll);
61 extern "C" void LLVMInitializeX86Target() {
62 // Register the target.
63 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
64 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
66 // Register the target asm info.
67 RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
68 RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
70 // Register the code emitter.
71 TargetRegistry::RegisterCodeEmitter(TheX86_32Target,
72 createX86_32MCCodeEmitter);
73 TargetRegistry::RegisterCodeEmitter(TheX86_64Target,
74 createX86_64MCCodeEmitter);
76 // Register the asm backend.
77 TargetRegistry::RegisterAsmBackend(TheX86_32Target,
78 createX86_32AsmBackend);
79 TargetRegistry::RegisterAsmBackend(TheX86_64Target,
80 createX86_64AsmBackend);
82 // Register the object streamer.
83 TargetRegistry::RegisterObjectStreamer(TheX86_32Target,
85 TargetRegistry::RegisterObjectStreamer(TheX86_64Target,
90 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
91 const std::string &FS)
92 : X86TargetMachine(T, TT, FS, false) {
96 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
97 const std::string &FS)
98 : X86TargetMachine(T, TT, FS, true) {
101 /// X86TargetMachine ctor - Create an X86 target.
103 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
104 const std::string &FS, bool is64Bit)
105 : LLVMTargetMachine(T, TT),
106 Subtarget(TT, FS, is64Bit),
107 DataLayout(Subtarget.getDataLayout()),
108 FrameInfo(TargetFrameInfo::StackGrowsDown,
109 Subtarget.getStackAlignment(),
110 (Subtarget.isTargetWin64() ? -40 :
111 (Subtarget.is64Bit() ? -8 : -4))),
112 InstrInfo(*this), JITInfo(*this), TLInfo(*this), TSInfo(*this),
113 ELFWriterInfo(*this) {
114 DefRelocModel = getRelocationModel();
116 // If no relocation model was picked, default as appropriate for the target.
117 if (getRelocationModel() == Reloc::Default) {
118 // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
119 // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
120 // use static relocation model by default.
121 if (Subtarget.isTargetDarwin()) {
122 if (Subtarget.is64Bit())
123 setRelocationModel(Reloc::PIC_);
125 setRelocationModel(Reloc::DynamicNoPIC);
126 } else if (Subtarget.isTargetWin64())
127 setRelocationModel(Reloc::PIC_);
129 setRelocationModel(Reloc::Static);
132 assert(getRelocationModel() != Reloc::Default &&
133 "Relocation mode not picked");
135 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
136 // is defined as a model for code which may be used in static or dynamic
137 // executables but not necessarily a shared library. On X86-32 we just
138 // compile in -static mode, in x86-64 we use PIC.
139 if (getRelocationModel() == Reloc::DynamicNoPIC) {
141 setRelocationModel(Reloc::PIC_);
142 else if (!Subtarget.isTargetDarwin())
143 setRelocationModel(Reloc::Static);
146 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
147 // the Mach-O file format doesn't support it.
148 if (getRelocationModel() == Reloc::Static &&
149 Subtarget.isTargetDarwin() &&
151 setRelocationModel(Reloc::PIC_);
153 // Determine the PICStyle based on the target selected.
154 if (getRelocationModel() == Reloc::Static) {
155 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
156 Subtarget.setPICStyle(PICStyles::None);
157 } else if (Subtarget.is64Bit()) {
158 // PIC in 64 bit mode is always rip-rel.
159 Subtarget.setPICStyle(PICStyles::RIPRel);
160 } else if (Subtarget.isTargetCygMing()) {
161 Subtarget.setPICStyle(PICStyles::None);
162 } else if (Subtarget.isTargetDarwin()) {
163 if (getRelocationModel() == Reloc::PIC_)
164 Subtarget.setPICStyle(PICStyles::StubPIC);
166 assert(getRelocationModel() == Reloc::DynamicNoPIC);
167 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
169 } else if (Subtarget.isTargetELF()) {
170 Subtarget.setPICStyle(PICStyles::GOT);
173 // Finally, if we have "none" as our PIC style, force to static mode.
174 if (Subtarget.getPICStyle() == PICStyles::None)
175 setRelocationModel(Reloc::Static);
178 //===----------------------------------------------------------------------===//
179 // Pass Pipeline Configuration
180 //===----------------------------------------------------------------------===//
182 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
183 CodeGenOpt::Level OptLevel) {
184 // Install an instruction selector.
185 PM.add(createX86ISelDag(*this, OptLevel));
187 // For 32-bit, prepend instructions to set the "global base reg" for PIC.
188 if (!Subtarget.is64Bit())
189 PM.add(createGlobalBaseRegPass());
194 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
195 CodeGenOpt::Level OptLevel) {
196 PM.add(createX86MaxStackAlignmentHeuristicPass());
197 return false; // -print-machineinstr shouldn't print after this.
200 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
201 CodeGenOpt::Level OptLevel) {
202 PM.add(createX86FloatingPointStackifierPass());
203 return true; // -print-machineinstr should print after this.
206 bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM,
207 CodeGenOpt::Level OptLevel) {
208 if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) {
209 PM.add(createSSEDomainFixPass());
215 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
216 CodeGenOpt::Level OptLevel,
217 JITCodeEmitter &JCE) {
218 // FIXME: Move this to TargetJITInfo!
219 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
220 if (DefRelocModel == Reloc::Default &&
221 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
222 setRelocationModel(Reloc::Static);
223 Subtarget.setPICStyle(PICStyles::None);
227 PM.add(createX86JITCodeEmitterPass(*this, JCE));
232 void X86TargetMachine::setCodeModelForStatic() {
234 if (getCodeModel() != CodeModel::Default) return;
236 // For static codegen, if we're not already set, use Small codegen.
237 setCodeModel(CodeModel::Small);
241 void X86TargetMachine::setCodeModelForJIT() {
243 if (getCodeModel() != CodeModel::Default) return;
245 // 64-bit JIT places everything in the same buffer except external functions.
246 if (Subtarget.is64Bit())
247 setCodeModel(CodeModel::Large);
249 setCodeModel(CodeModel::Small);