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);
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), ELFWriterInfo(*this) {
86 DefRelocModel = getRelocationModel();
88 // If no relocation model was picked, default as appropriate for the target.
89 if (getRelocationModel() == Reloc::Default) {
90 if (!Subtarget.isTargetDarwin())
91 setRelocationModel(Reloc::Static);
92 else if (Subtarget.is64Bit())
93 setRelocationModel(Reloc::PIC_);
95 setRelocationModel(Reloc::DynamicNoPIC);
98 assert(getRelocationModel() != Reloc::Default &&
99 "Relocation mode not picked");
101 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
102 // is defined as a model for code which may be used in static or dynamic
103 // executables but not necessarily a shared library. On X86-32 we just
104 // compile in -static mode, in x86-64 we use PIC.
105 if (getRelocationModel() == Reloc::DynamicNoPIC) {
107 setRelocationModel(Reloc::PIC_);
108 else if (!Subtarget.isTargetDarwin())
109 setRelocationModel(Reloc::Static);
112 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
113 // the Mach-O file format doesn't support it.
114 if (getRelocationModel() == Reloc::Static &&
115 Subtarget.isTargetDarwin() &&
117 setRelocationModel(Reloc::PIC_);
119 // Determine the PICStyle based on the target selected.
120 if (getRelocationModel() == Reloc::Static) {
121 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
122 Subtarget.setPICStyle(PICStyles::None);
123 } else if (Subtarget.isTargetCygMing()) {
124 Subtarget.setPICStyle(PICStyles::None);
125 } else if (Subtarget.isTargetDarwin()) {
126 if (Subtarget.is64Bit())
127 Subtarget.setPICStyle(PICStyles::RIPRel);
128 else if (getRelocationModel() == Reloc::PIC_)
129 Subtarget.setPICStyle(PICStyles::StubPIC);
131 assert(getRelocationModel() == Reloc::DynamicNoPIC);
132 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
134 } else if (Subtarget.isTargetELF()) {
135 if (Subtarget.is64Bit())
136 Subtarget.setPICStyle(PICStyles::RIPRel);
138 Subtarget.setPICStyle(PICStyles::GOT);
141 // Finally, if we have "none" as our PIC style, force to static mode.
142 if (Subtarget.getPICStyle() == PICStyles::None)
143 setRelocationModel(Reloc::Static);
146 //===----------------------------------------------------------------------===//
147 // Pass Pipeline Configuration
148 //===----------------------------------------------------------------------===//
150 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
151 CodeGenOpt::Level OptLevel) {
152 // Install an instruction selector.
153 PM.add(createX86ISelDag(*this, OptLevel));
155 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
156 PM.add(createX87FPRegKillInserterPass());
161 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
162 CodeGenOpt::Level OptLevel) {
163 return false; // -print-machineinstr shouldn't print after this.
166 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
167 CodeGenOpt::Level OptLevel) {
168 PM.add(createX86FloatingPointStackifierPass());
169 return true; // -print-machineinstr should print after this.
172 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
173 CodeGenOpt::Level OptLevel,
174 JITCodeEmitter &JCE) {
175 // FIXME: Move this to TargetJITInfo!
176 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
177 if (DefRelocModel == Reloc::Default &&
178 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
179 setRelocationModel(Reloc::Static);
180 Subtarget.setPICStyle(PICStyles::None);
184 PM.add(createX86JITCodeEmitterPass(*this, JCE));
189 void X86TargetMachine::setCodeModelForStatic() {
191 if (getCodeModel() != CodeModel::Default) return;
193 // For static codegen, if we're not already set, use Small codegen.
194 setCodeModel(CodeModel::Small);
198 void X86TargetMachine::setCodeModelForJIT() {
200 if (getCodeModel() != CodeModel::Default) return;
202 // 64-bit JIT places everything in the same buffer except external functions.
203 if (Subtarget.is64Bit())
204 setCodeModel(CodeModel::Large);
206 setCodeModel(CodeModel::Small);