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);
54 extern "C" void LLVMInitializeX86Target() {
55 // Register the target.
56 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
57 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
59 // Register the target asm info.
60 RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
61 RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
63 // Register the code emitter.
64 TargetRegistry::RegisterCodeEmitter(TheX86_32Target,
65 createX86_32MCCodeEmitter);
66 TargetRegistry::RegisterCodeEmitter(TheX86_64Target,
67 createX86_64MCCodeEmitter);
69 // Register the asm backend.
70 TargetRegistry::RegisterAsmBackend(TheX86_32Target,
71 createX86_32AsmBackend);
72 TargetRegistry::RegisterAsmBackend(TheX86_64Target,
73 createX86_64AsmBackend);
75 // Register the object streamer.
76 TargetRegistry::RegisterObjectStreamer(TheX86_32Target,
78 TargetRegistry::RegisterObjectStreamer(TheX86_64Target,
83 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
84 const std::string &FS)
85 : X86TargetMachine(T, TT, FS, false) {
89 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
90 const std::string &FS)
91 : X86TargetMachine(T, TT, FS, true) {
94 /// X86TargetMachine ctor - Create an X86 target.
96 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
97 const std::string &FS, bool is64Bit)
98 : LLVMTargetMachine(T, TT),
99 Subtarget(TT, FS, is64Bit),
100 DataLayout(Subtarget.getDataLayout()),
101 FrameInfo(TargetFrameInfo::StackGrowsDown,
102 Subtarget.getStackAlignment(),
103 (Subtarget.isTargetWin64() ? -40 :
104 (Subtarget.is64Bit() ? -8 : -4))),
105 InstrInfo(*this), JITInfo(*this), TLInfo(*this), TSInfo(*this),
106 ELFWriterInfo(*this) {
107 DefRelocModel = getRelocationModel();
109 // If no relocation model was picked, default as appropriate for the target.
110 if (getRelocationModel() == Reloc::Default) {
111 if (!Subtarget.isTargetDarwin())
112 setRelocationModel(Reloc::Static);
113 else if (Subtarget.is64Bit())
114 setRelocationModel(Reloc::PIC_);
116 setRelocationModel(Reloc::DynamicNoPIC);
119 assert(getRelocationModel() != Reloc::Default &&
120 "Relocation mode not picked");
122 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
123 // is defined as a model for code which may be used in static or dynamic
124 // executables but not necessarily a shared library. On X86-32 we just
125 // compile in -static mode, in x86-64 we use PIC.
126 if (getRelocationModel() == Reloc::DynamicNoPIC) {
128 setRelocationModel(Reloc::PIC_);
129 else if (!Subtarget.isTargetDarwin())
130 setRelocationModel(Reloc::Static);
133 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
134 // the Mach-O file format doesn't support it.
135 if (getRelocationModel() == Reloc::Static &&
136 Subtarget.isTargetDarwin() &&
138 setRelocationModel(Reloc::PIC_);
140 // Determine the PICStyle based on the target selected.
141 if (getRelocationModel() == Reloc::Static) {
142 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
143 Subtarget.setPICStyle(PICStyles::None);
144 } else if (Subtarget.isTargetCygMing()) {
145 Subtarget.setPICStyle(PICStyles::None);
146 } else if (Subtarget.isTargetDarwin()) {
147 if (Subtarget.is64Bit())
148 Subtarget.setPICStyle(PICStyles::RIPRel);
149 else if (getRelocationModel() == Reloc::PIC_)
150 Subtarget.setPICStyle(PICStyles::StubPIC);
152 assert(getRelocationModel() == Reloc::DynamicNoPIC);
153 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
155 } else if (Subtarget.isTargetELF()) {
156 if (Subtarget.is64Bit())
157 Subtarget.setPICStyle(PICStyles::RIPRel);
159 Subtarget.setPICStyle(PICStyles::GOT);
162 // Finally, if we have "none" as our PIC style, force to static mode.
163 if (Subtarget.getPICStyle() == PICStyles::None)
164 setRelocationModel(Reloc::Static);
167 //===----------------------------------------------------------------------===//
168 // Pass Pipeline Configuration
169 //===----------------------------------------------------------------------===//
171 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
172 CodeGenOpt::Level OptLevel) {
173 // Install an instruction selector.
174 PM.add(createX86ISelDag(*this, OptLevel));
176 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
177 PM.add(createX87FPRegKillInserterPass());
182 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
183 CodeGenOpt::Level OptLevel) {
184 PM.add(createX86MaxStackAlignmentHeuristicPass());
185 return false; // -print-machineinstr shouldn't print after this.
188 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
189 CodeGenOpt::Level OptLevel) {
190 PM.add(createX86FloatingPointStackifierPass());
191 return true; // -print-machineinstr should print after this.
194 bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM,
195 CodeGenOpt::Level OptLevel) {
196 if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) {
197 PM.add(createSSEDomainFixPass());
203 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
204 CodeGenOpt::Level OptLevel,
205 JITCodeEmitter &JCE) {
206 // FIXME: Move this to TargetJITInfo!
207 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
208 if (DefRelocModel == Reloc::Default &&
209 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
210 setRelocationModel(Reloc::Static);
211 Subtarget.setPICStyle(PICStyles::None);
215 PM.add(createX86JITCodeEmitterPass(*this, JCE));
220 void X86TargetMachine::setCodeModelForStatic() {
222 if (getCodeModel() != CodeModel::Default) return;
224 // For static codegen, if we're not already set, use Small codegen.
225 setCodeModel(CodeModel::Small);
229 void X86TargetMachine::setCodeModelForJIT() {
231 if (getCodeModel() != CodeModel::Default) return;
233 // 64-bit JIT places everything in the same buffer except external functions.
234 if (Subtarget.is64Bit())
235 setCodeModel(CodeModel::Large);
237 setCodeModel(CodeModel::Small);