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);
57 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
58 const std::string &FS)
59 : X86TargetMachine(T, TT, FS, false) {
63 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
64 const std::string &FS)
65 : X86TargetMachine(T, TT, FS, true) {
68 /// X86TargetMachine ctor - Create an X86 target.
70 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
71 const std::string &FS, bool is64Bit)
72 : LLVMTargetMachine(T, TT),
73 Subtarget(TT, FS, is64Bit),
74 DataLayout(Subtarget.getDataLayout()),
75 FrameInfo(TargetFrameInfo::StackGrowsDown,
76 Subtarget.getStackAlignment(),
77 (Subtarget.isTargetWin64() ? -40 :
78 (Subtarget.is64Bit() ? -8 : -4))),
79 InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
80 DefRelocModel = getRelocationModel();
82 // If no relocation model was picked, default as appropriate for the target.
83 if (getRelocationModel() == Reloc::Default) {
84 if (!Subtarget.isTargetDarwin())
85 setRelocationModel(Reloc::Static);
86 else if (Subtarget.is64Bit())
87 setRelocationModel(Reloc::PIC_);
89 setRelocationModel(Reloc::DynamicNoPIC);
92 assert(getRelocationModel() != Reloc::Default &&
93 "Relocation mode not picked");
95 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
96 // is defined as a model for code which may be used in static or dynamic
97 // executables but not necessarily a shared library. On X86-32 we just
98 // compile in -static mode, in x86-64 we use PIC.
99 if (getRelocationModel() == Reloc::DynamicNoPIC) {
101 setRelocationModel(Reloc::PIC_);
102 else if (!Subtarget.isTargetDarwin())
103 setRelocationModel(Reloc::Static);
106 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
107 // the Mach-O file format doesn't support it.
108 if (getRelocationModel() == Reloc::Static &&
109 Subtarget.isTargetDarwin() &&
111 setRelocationModel(Reloc::PIC_);
113 // Determine the PICStyle based on the target selected.
114 if (getRelocationModel() == Reloc::Static) {
115 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
116 Subtarget.setPICStyle(PICStyles::None);
117 } else if (Subtarget.isTargetCygMing()) {
118 Subtarget.setPICStyle(PICStyles::None);
119 } else if (Subtarget.isTargetDarwin()) {
120 if (Subtarget.is64Bit())
121 Subtarget.setPICStyle(PICStyles::RIPRel);
122 else if (getRelocationModel() == Reloc::PIC_)
123 Subtarget.setPICStyle(PICStyles::StubPIC);
125 assert(getRelocationModel() == Reloc::DynamicNoPIC);
126 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
128 } else if (Subtarget.isTargetELF()) {
129 if (Subtarget.is64Bit())
130 Subtarget.setPICStyle(PICStyles::RIPRel);
132 Subtarget.setPICStyle(PICStyles::GOT);
135 // Finally, if we have "none" as our PIC style, force to static mode.
136 if (Subtarget.getPICStyle() == PICStyles::None)
137 setRelocationModel(Reloc::Static);
140 //===----------------------------------------------------------------------===//
141 // Pass Pipeline Configuration
142 //===----------------------------------------------------------------------===//
144 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
145 CodeGenOpt::Level OptLevel) {
146 // Install an instruction selector.
147 PM.add(createX86ISelDag(*this, OptLevel));
149 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
150 PM.add(createX87FPRegKillInserterPass());
155 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
156 CodeGenOpt::Level OptLevel) {
157 return false; // -print-machineinstr shouldn't print after this.
160 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
161 CodeGenOpt::Level OptLevel) {
162 PM.add(createX86FloatingPointStackifierPass());
163 return true; // -print-machineinstr should print after this.
166 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
167 CodeGenOpt::Level OptLevel,
168 JITCodeEmitter &JCE) {
169 // FIXME: Move this to TargetJITInfo!
170 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
171 if (DefRelocModel == Reloc::Default &&
172 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
173 setRelocationModel(Reloc::Static);
174 Subtarget.setPICStyle(PICStyles::None);
178 PM.add(createX86JITCodeEmitterPass(*this, JCE));
183 void X86TargetMachine::setCodeModelForStatic() {
185 if (getCodeModel() != CodeModel::Default) return;
187 // For static codegen, if we're not already set, use Small codegen.
188 setCodeModel(CodeModel::Small);
192 void X86TargetMachine::setCodeModelForJIT() {
194 if (getCodeModel() != CodeModel::Default) return;
196 // 64-bit JIT places everything in the same buffer except external functions.
197 if (Subtarget.is64Bit())
198 setCodeModel(CodeModel::Large);
200 setCodeModel(CodeModel::Small);