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 "X86TargetAsmInfo.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 extern "C" void LLVMInitializeX86Target() {
26 // Register the target.
27 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
28 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
31 const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
32 if (Subtarget.isFlavorIntel())
33 return new X86WinTargetAsmInfo(*this);
34 switch (Subtarget.TargetType) {
35 default: llvm_unreachable("unknown subtarget type");
36 case X86Subtarget::isDarwin:
37 return new X86DarwinTargetAsmInfo(*this);
38 case X86Subtarget::isELF:
39 return new X86ELFTargetAsmInfo(*this);
40 case X86Subtarget::isMingw:
41 case X86Subtarget::isCygwin:
42 return new X86COFFTargetAsmInfo(*this);
43 case X86Subtarget::isWindows:
44 return new X86WinTargetAsmInfo(*this);
48 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const std::string &TT,
49 const std::string &FS)
50 : X86TargetMachine(T, TT, FS, false) {
54 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const std::string &TT,
55 const std::string &FS)
56 : X86TargetMachine(T, TT, FS, true) {
59 /// X86TargetMachine ctor - Create an X86 target.
61 X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
62 const std::string &FS, bool is64Bit)
63 : LLVMTargetMachine(T),
64 Subtarget(TT, FS, is64Bit),
65 DataLayout(Subtarget.getDataLayout()),
66 FrameInfo(TargetFrameInfo::StackGrowsDown,
67 Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
68 InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
69 DefRelocModel = getRelocationModel();
71 // If no relocation model was picked, default as appropriate for the target.
72 if (getRelocationModel() == Reloc::Default) {
73 if (!Subtarget.isTargetDarwin())
74 setRelocationModel(Reloc::Static);
75 else if (Subtarget.is64Bit())
76 setRelocationModel(Reloc::PIC_);
78 setRelocationModel(Reloc::DynamicNoPIC);
81 assert(getRelocationModel() != Reloc::Default &&
82 "Relocation mode not picked");
84 // If no code model is picked, default to small.
85 if (getCodeModel() == CodeModel::Default)
86 setCodeModel(CodeModel::Small);
88 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
89 // is defined as a model for code which may be used in static or dynamic
90 // executables but not necessarily a shared library. On X86-32 we just
91 // compile in -static mode, in x86-64 we use PIC.
92 if (getRelocationModel() == Reloc::DynamicNoPIC) {
94 setRelocationModel(Reloc::PIC_);
95 else if (!Subtarget.isTargetDarwin())
96 setRelocationModel(Reloc::Static);
99 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
100 // the Mach-O file format doesn't support it.
101 if (getRelocationModel() == Reloc::Static &&
102 Subtarget.isTargetDarwin() &&
104 setRelocationModel(Reloc::PIC_);
106 // Determine the PICStyle based on the target selected.
107 if (getRelocationModel() == Reloc::Static) {
108 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
109 Subtarget.setPICStyle(PICStyles::None);
110 } else if (Subtarget.isTargetCygMing()) {
111 Subtarget.setPICStyle(PICStyles::None);
112 } else if (Subtarget.isTargetDarwin()) {
113 if (Subtarget.is64Bit())
114 Subtarget.setPICStyle(PICStyles::RIPRel);
115 else if (getRelocationModel() == Reloc::PIC_)
116 Subtarget.setPICStyle(PICStyles::StubPIC);
118 assert(getRelocationModel() == Reloc::DynamicNoPIC);
119 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
121 } else if (Subtarget.isTargetELF()) {
122 if (Subtarget.is64Bit())
123 Subtarget.setPICStyle(PICStyles::RIPRel);
125 Subtarget.setPICStyle(PICStyles::GOT);
128 // Finally, if we have "none" as our PIC style, force to static mode.
129 if (Subtarget.getPICStyle() == PICStyles::None)
130 setRelocationModel(Reloc::Static);
133 //===----------------------------------------------------------------------===//
134 // Pass Pipeline Configuration
135 //===----------------------------------------------------------------------===//
137 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
138 CodeGenOpt::Level OptLevel) {
139 // Install an instruction selector.
140 PM.add(createX86ISelDag(*this, OptLevel));
142 // If we're using Fast-ISel, clean up the mess.
144 PM.add(createDeadMachineInstructionElimPass());
146 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
147 PM.add(createX87FPRegKillInserterPass());
152 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
153 CodeGenOpt::Level OptLevel) {
154 // Calculate and set max stack object alignment early, so we can decide
155 // whether we will need stack realignment (and thus FP).
156 PM.add(createX86MaxStackAlignmentCalculatorPass());
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 MachineCodeEmitter &MCE) {
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);
177 // 64-bit JIT places everything in the same buffer except external functions.
178 // On Darwin, use small code model but hack the call instruction for
179 // externals. Elsewhere, do not assume globals are in the lower 4G.
180 if (Subtarget.is64Bit()) {
181 if (Subtarget.isTargetDarwin())
182 setCodeModel(CodeModel::Small);
184 setCodeModel(CodeModel::Large);
187 PM.add(createX86CodeEmitterPass(*this, MCE));
192 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
193 CodeGenOpt::Level OptLevel,
194 JITCodeEmitter &JCE) {
195 // FIXME: Move this to TargetJITInfo!
196 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
197 if (DefRelocModel == Reloc::Default &&
198 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
199 setRelocationModel(Reloc::Static);
200 Subtarget.setPICStyle(PICStyles::None);
203 // 64-bit JIT places everything in the same buffer except external functions.
204 // On Darwin, use small code model but hack the call instruction for
205 // externals. Elsewhere, do not assume globals are in the lower 4G.
206 if (Subtarget.is64Bit()) {
207 if (Subtarget.isTargetDarwin())
208 setCodeModel(CodeModel::Small);
210 setCodeModel(CodeModel::Large);
213 PM.add(createX86JITCodeEmitterPass(*this, JCE));
218 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
219 CodeGenOpt::Level OptLevel,
220 ObjectCodeEmitter &OCE) {
221 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
225 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
226 CodeGenOpt::Level OptLevel,
227 MachineCodeEmitter &MCE) {
228 PM.add(createX86CodeEmitterPass(*this, MCE));
232 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
233 CodeGenOpt::Level OptLevel,
234 JITCodeEmitter &JCE) {
235 PM.add(createX86JITCodeEmitterPass(*this, JCE));
239 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
240 CodeGenOpt::Level OptLevel,
241 ObjectCodeEmitter &OCE) {
242 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));