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/Support/FormattedStream.h"
21 #include "llvm/Target/TargetOptions.h"
22 #include "llvm/Target/TargetRegistry.h"
25 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
27 switch (TheTriple.getOS()) {
29 return new X86MCAsmInfoDarwin(TheTriple);
34 return new X86MCAsmInfoCOFF(TheTriple);
36 return new X86ELFMCAsmInfo(TheTriple);
40 extern "C" void LLVMInitializeX86Target() {
41 // Register the target.
42 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
43 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
45 // Register the target asm info.
46 RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
47 RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
49 // Register the code emitter.
50 TargetRegistry::RegisterCodeEmitter(TheX86_32Target,
51 createX86_32MCCodeEmitter);
52 TargetRegistry::RegisterCodeEmitter(TheX86_64Target,
53 createX86_64MCCodeEmitter);
55 // Register the asm backend.
56 TargetRegistry::RegisterAsmBackend(TheX86_32Target,
57 createX86_32AsmBackend);
58 TargetRegistry::RegisterAsmBackend(TheX86_64Target,
59 createX86_64AsmBackend);
63 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
64 const std::string &FS)
65 : X86TargetMachine(T, TT, FS, false) {
69 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
70 const std::string &FS)
71 : X86TargetMachine(T, TT, FS, true) {
74 /// X86TargetMachine ctor - Create an X86 target.
76 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
77 const std::string &FS, bool is64Bit)
78 : LLVMTargetMachine(T, TT),
79 Subtarget(TT, FS, is64Bit),
80 DataLayout(Subtarget.getDataLayout()),
81 FrameInfo(TargetFrameInfo::StackGrowsDown,
82 Subtarget.getStackAlignment(),
83 (Subtarget.isTargetWin64() ? -40 :
84 (Subtarget.is64Bit() ? -8 : -4))),
85 InstrInfo(*this), JITInfo(*this), TLInfo(*this), TSInfo(*this),
86 ELFWriterInfo(*this) {
87 DefRelocModel = getRelocationModel();
89 // If no relocation model was picked, default as appropriate for the target.
90 if (getRelocationModel() == Reloc::Default) {
91 if (!Subtarget.isTargetDarwin())
92 setRelocationModel(Reloc::Static);
93 else if (Subtarget.is64Bit())
94 setRelocationModel(Reloc::PIC_);
96 setRelocationModel(Reloc::DynamicNoPIC);
99 assert(getRelocationModel() != Reloc::Default &&
100 "Relocation mode not picked");
102 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
103 // is defined as a model for code which may be used in static or dynamic
104 // executables but not necessarily a shared library. On X86-32 we just
105 // compile in -static mode, in x86-64 we use PIC.
106 if (getRelocationModel() == Reloc::DynamicNoPIC) {
108 setRelocationModel(Reloc::PIC_);
109 else if (!Subtarget.isTargetDarwin())
110 setRelocationModel(Reloc::Static);
113 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
114 // the Mach-O file format doesn't support it.
115 if (getRelocationModel() == Reloc::Static &&
116 Subtarget.isTargetDarwin() &&
118 setRelocationModel(Reloc::PIC_);
120 // Determine the PICStyle based on the target selected.
121 if (getRelocationModel() == Reloc::Static) {
122 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
123 Subtarget.setPICStyle(PICStyles::None);
124 } else if (Subtarget.isTargetCygMing()) {
125 Subtarget.setPICStyle(PICStyles::None);
126 } else if (Subtarget.isTargetDarwin()) {
127 if (Subtarget.is64Bit())
128 Subtarget.setPICStyle(PICStyles::RIPRel);
129 else if (getRelocationModel() == Reloc::PIC_)
130 Subtarget.setPICStyle(PICStyles::StubPIC);
132 assert(getRelocationModel() == Reloc::DynamicNoPIC);
133 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
135 } else if (Subtarget.isTargetELF()) {
136 if (Subtarget.is64Bit())
137 Subtarget.setPICStyle(PICStyles::RIPRel);
139 Subtarget.setPICStyle(PICStyles::GOT);
142 // Finally, if we have "none" as our PIC style, force to static mode.
143 if (Subtarget.getPICStyle() == PICStyles::None)
144 setRelocationModel(Reloc::Static);
147 //===----------------------------------------------------------------------===//
148 // Pass Pipeline Configuration
149 //===----------------------------------------------------------------------===//
151 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
152 CodeGenOpt::Level OptLevel) {
153 // Install an instruction selector.
154 PM.add(createX86ISelDag(*this, OptLevel));
156 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
157 PM.add(createX87FPRegKillInserterPass());
162 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
163 CodeGenOpt::Level OptLevel) {
164 PM.add(createX86MaxStackAlignmentHeuristicPass());
165 return false; // -print-machineinstr shouldn't print after this.
168 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
169 CodeGenOpt::Level OptLevel) {
170 PM.add(createX86FloatingPointStackifierPass());
171 return true; // -print-machineinstr should print after this.
174 bool X86TargetMachine::addPreEmitPass(PassManagerBase &PM,
175 CodeGenOpt::Level OptLevel) {
176 if (OptLevel != CodeGenOpt::None && Subtarget.hasSSE2()) {
177 PM.add(createSSEDomainFixPass());
183 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
184 CodeGenOpt::Level OptLevel,
185 JITCodeEmitter &JCE) {
186 // FIXME: Move this to TargetJITInfo!
187 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
188 if (DefRelocModel == Reloc::Default &&
189 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
190 setRelocationModel(Reloc::Static);
191 Subtarget.setPICStyle(PICStyles::None);
195 PM.add(createX86JITCodeEmitterPass(*this, JCE));
200 void X86TargetMachine::setCodeModelForStatic() {
202 if (getCodeModel() != CodeModel::Default) return;
204 // For static codegen, if we're not already set, use Small codegen.
205 setCodeModel(CodeModel::Small);
209 void X86TargetMachine::setCodeModelForJIT() {
211 if (getCodeModel() != CodeModel::Default) return;
213 // 64-bit JIT places everything in the same buffer except external functions.
214 if (Subtarget.is64Bit())
215 setCodeModel(CodeModel::Large);
217 setCodeModel(CodeModel::Small);