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 const MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
27 switch (TheTriple.getOS()) {
29 return new X86MCAsmInfoDarwin(TheTriple);
33 return new X86MCAsmInfoCOFF(TheTriple);
35 return new X86WinMCAsmInfo(TheTriple);
37 return new X86ELFMCAsmInfo(TheTriple);
41 extern "C" void LLVMInitializeX86Disassembler();
43 extern "C" void LLVMInitializeX86Target() {
44 // Register the target.
45 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
46 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
48 // Register the target asm info.
49 RegisterAsmInfoFn A(TheX86_32Target, createMCAsmInfo);
50 RegisterAsmInfoFn B(TheX86_64Target, createMCAsmInfo);
52 LLVMInitializeX86Disassembler();
54 // Register the code emitter.
55 TargetRegistry::RegisterCodeEmitter(TheX86_32Target, createX86MCCodeEmitter);
56 TargetRegistry::RegisterCodeEmitter(TheX86_64Target, createX86MCCodeEmitter);
60 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
61 const std::string &FS)
62 : X86TargetMachine(T, TT, FS, false) {
66 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
67 const std::string &FS)
68 : X86TargetMachine(T, TT, FS, true) {
71 /// X86TargetMachine ctor - Create an X86 target.
73 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
74 const std::string &FS, bool is64Bit)
75 : LLVMTargetMachine(T, TT),
76 Subtarget(TT, FS, is64Bit),
77 DataLayout(Subtarget.getDataLayout()),
78 FrameInfo(TargetFrameInfo::StackGrowsDown,
79 Subtarget.getStackAlignment(),
80 (Subtarget.isTargetWin64() ? -40 :
81 (Subtarget.is64Bit() ? -8 : -4))),
82 InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
83 DefRelocModel = getRelocationModel();
85 // If no relocation model was picked, default as appropriate for the target.
86 if (getRelocationModel() == Reloc::Default) {
87 if (!Subtarget.isTargetDarwin())
88 setRelocationModel(Reloc::Static);
89 else if (Subtarget.is64Bit())
90 setRelocationModel(Reloc::PIC_);
92 setRelocationModel(Reloc::DynamicNoPIC);
95 assert(getRelocationModel() != Reloc::Default &&
96 "Relocation mode not picked");
98 // If no code model is picked, default to small.
99 if (getCodeModel() == CodeModel::Default)
100 setCodeModel(CodeModel::Small);
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 // If we're using Fast-ISel, clean up the mess.
158 PM.add(createDeadMachineInstructionElimPass());
160 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
161 PM.add(createX87FPRegKillInserterPass());
166 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
167 CodeGenOpt::Level OptLevel) {
168 // Calculate and set max stack object alignment early, so we can decide
169 // whether we will need stack realignment (and thus FP).
170 PM.add(createMaxStackAlignmentCalculatorPass());
171 return false; // -print-machineinstr shouldn't print after this.
174 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
175 CodeGenOpt::Level OptLevel) {
176 PM.add(createX86FloatingPointStackifierPass());
177 return true; // -print-machineinstr should print after this.
180 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
181 CodeGenOpt::Level OptLevel,
182 MachineCodeEmitter &MCE) {
183 // FIXME: Move this to TargetJITInfo!
184 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
185 if (DefRelocModel == Reloc::Default &&
186 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
187 setRelocationModel(Reloc::Static);
188 Subtarget.setPICStyle(PICStyles::None);
191 // 64-bit JIT places everything in the same buffer except external functions.
192 if (Subtarget.is64Bit())
193 setCodeModel(CodeModel::Large);
195 PM.add(createX86CodeEmitterPass(*this, MCE));
200 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
201 CodeGenOpt::Level OptLevel,
202 JITCodeEmitter &JCE) {
203 // FIXME: Move this to TargetJITInfo!
204 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
205 if (DefRelocModel == Reloc::Default &&
206 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
207 setRelocationModel(Reloc::Static);
208 Subtarget.setPICStyle(PICStyles::None);
211 // 64-bit JIT places everything in the same buffer except external functions.
212 if (Subtarget.is64Bit())
213 setCodeModel(CodeModel::Large);
215 PM.add(createX86JITCodeEmitterPass(*this, JCE));
220 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
221 CodeGenOpt::Level OptLevel,
222 ObjectCodeEmitter &OCE) {
223 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
227 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
228 CodeGenOpt::Level OptLevel,
229 MachineCodeEmitter &MCE) {
230 PM.add(createX86CodeEmitterPass(*this, MCE));
234 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
235 CodeGenOpt::Level OptLevel,
236 JITCodeEmitter &JCE) {
237 PM.add(createX86JITCodeEmitterPass(*this, JCE));
241 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
242 CodeGenOpt::Level OptLevel,
243 ObjectCodeEmitter &OCE) {
244 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));