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/Module.h"
18 #include "llvm/PassManager.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/Passes.h"
21 #include "llvm/Support/FormattedStream.h"
22 #include "llvm/Target/TargetOptions.h"
23 #include "llvm/Target/TargetMachineRegistry.h"
26 /// X86TargetMachineModule - Note that this is used on hosts that cannot link
27 /// in a library unless there are references into the library. In particular,
28 /// it seems that it is not possible to get things to work on Win32 without
29 /// this. Though it is unused, do not remove it.
30 extern "C" int X86TargetMachineModule;
31 int X86TargetMachineModule = 0;
33 // Register the target.
34 extern Target TheX86_32Target;
35 static RegisterTarget<X86_32TargetMachine>
36 X(TheX86_32Target, "x86", "32-bit X86: Pentium-Pro and above");
38 extern Target TheX86_64Target;
39 static RegisterTarget<X86_64TargetMachine>
40 Y(TheX86_64Target, "x86-64", "64-bit X86: EM64T and AMD64");
42 // Force static initialization.
43 extern "C" void LLVMInitializeX86Target() {
47 const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
48 if (Subtarget.isFlavorIntel())
49 return new X86WinTargetAsmInfo(*this);
51 switch (Subtarget.TargetType) {
52 case X86Subtarget::isDarwin:
53 return new X86DarwinTargetAsmInfo(*this);
54 case X86Subtarget::isELF:
55 return new X86ELFTargetAsmInfo(*this);
56 case X86Subtarget::isMingw:
57 case X86Subtarget::isCygwin:
58 return new X86COFFTargetAsmInfo(*this);
59 case X86Subtarget::isWindows:
60 return new X86WinTargetAsmInfo(*this);
62 return new X86GenericTargetAsmInfo(*this);
66 X86_32TargetMachine::X86_32TargetMachine(const Target &T, const Module &M,
67 const std::string &FS)
68 : X86TargetMachine(T, M, FS, false) {
72 X86_64TargetMachine::X86_64TargetMachine(const Target &T, const Module &M,
73 const std::string &FS)
74 : X86TargetMachine(T, M, FS, true) {
77 /// X86TargetMachine ctor - Create an X86 target.
79 X86TargetMachine::X86TargetMachine(const Target &T, const Module &M,
80 const std::string &FS, bool is64Bit)
81 : LLVMTargetMachine(T),
82 Subtarget(M, FS, is64Bit),
83 DataLayout(Subtarget.getDataLayout()),
84 FrameInfo(TargetFrameInfo::StackGrowsDown,
85 Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
86 InstrInfo(*this), JITInfo(*this), TLInfo(*this), 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 // If no code model is picked, default to small.
103 if (getCodeModel() == CodeModel::Default)
104 setCodeModel(CodeModel::Small);
106 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
107 // is defined as a model for code which may be used in static or dynamic
108 // executables but not necessarily a shared library. On X86-32 we just
109 // compile in -static mode, in x86-64 we use PIC.
110 if (getRelocationModel() == Reloc::DynamicNoPIC) {
112 setRelocationModel(Reloc::PIC_);
113 else if (!Subtarget.isTargetDarwin())
114 setRelocationModel(Reloc::Static);
117 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
118 // the Mach-O file format doesn't support it.
119 if (getRelocationModel() == Reloc::Static &&
120 Subtarget.isTargetDarwin() &&
122 setRelocationModel(Reloc::PIC_);
124 // Determine the PICStyle based on the target selected.
125 if (getRelocationModel() == Reloc::Static) {
126 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
127 Subtarget.setPICStyle(PICStyles::None);
128 } else if (Subtarget.isTargetCygMing()) {
129 Subtarget.setPICStyle(PICStyles::None);
130 } else if (Subtarget.isTargetDarwin()) {
131 if (Subtarget.is64Bit())
132 Subtarget.setPICStyle(PICStyles::RIPRel);
133 else if (getRelocationModel() == Reloc::PIC_)
134 Subtarget.setPICStyle(PICStyles::StubPIC);
136 assert(getRelocationModel() == Reloc::DynamicNoPIC);
137 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
139 } else if (Subtarget.isTargetELF()) {
140 if (Subtarget.is64Bit())
141 Subtarget.setPICStyle(PICStyles::RIPRel);
143 Subtarget.setPICStyle(PICStyles::GOT);
146 // Finally, if we have "none" as our PIC style, force to static mode.
147 if (Subtarget.getPICStyle() == PICStyles::None)
148 setRelocationModel(Reloc::Static);
151 //===----------------------------------------------------------------------===//
152 // Pass Pipeline Configuration
153 //===----------------------------------------------------------------------===//
155 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
156 CodeGenOpt::Level OptLevel) {
157 // Install an instruction selector.
158 PM.add(createX86ISelDag(*this, OptLevel));
160 // If we're using Fast-ISel, clean up the mess.
162 PM.add(createDeadMachineInstructionElimPass());
164 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
165 PM.add(createX87FPRegKillInserterPass());
170 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
171 CodeGenOpt::Level OptLevel) {
172 // Calculate and set max stack object alignment early, so we can decide
173 // whether we will need stack realignment (and thus FP).
174 PM.add(createX86MaxStackAlignmentCalculatorPass());
175 return false; // -print-machineinstr shouldn't print after this.
178 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
179 CodeGenOpt::Level OptLevel) {
180 PM.add(createX86FloatingPointStackifierPass());
181 return true; // -print-machineinstr should print after this.
184 bool X86TargetMachine::addAssemblyEmitter(PassManagerBase &PM,
185 CodeGenOpt::Level OptLevel,
187 formatted_raw_ostream &Out) {
188 FunctionPass *Printer = getTarget().createAsmPrinter(Out, *this, Verbose);
190 llvm_report_error("unable to create assembly printer");
195 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
196 CodeGenOpt::Level OptLevel,
198 MachineCodeEmitter &MCE) {
199 // FIXME: Move this to TargetJITInfo!
200 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
201 if (DefRelocModel == Reloc::Default &&
202 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
203 setRelocationModel(Reloc::Static);
204 Subtarget.setPICStyle(PICStyles::None);
207 // 64-bit JIT places everything in the same buffer except external functions.
208 // On Darwin, use small code model but hack the call instruction for
209 // externals. Elsewhere, do not assume globals are in the lower 4G.
210 if (Subtarget.is64Bit()) {
211 if (Subtarget.isTargetDarwin())
212 setCodeModel(CodeModel::Small);
214 setCodeModel(CodeModel::Large);
217 PM.add(createX86CodeEmitterPass(*this, MCE));
219 addAssemblyEmitter(PM, OptLevel, true, ferrs());
224 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
225 CodeGenOpt::Level OptLevel,
227 JITCodeEmitter &JCE) {
228 // FIXME: Move this to TargetJITInfo!
229 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
230 if (DefRelocModel == Reloc::Default &&
231 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
232 setRelocationModel(Reloc::Static);
233 Subtarget.setPICStyle(PICStyles::None);
236 // 64-bit JIT places everything in the same buffer except external functions.
237 // On Darwin, use small code model but hack the call instruction for
238 // externals. Elsewhere, do not assume globals are in the lower 4G.
239 if (Subtarget.is64Bit()) {
240 if (Subtarget.isTargetDarwin())
241 setCodeModel(CodeModel::Small);
243 setCodeModel(CodeModel::Large);
246 PM.add(createX86JITCodeEmitterPass(*this, JCE));
248 addAssemblyEmitter(PM, OptLevel, true, ferrs());
253 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
254 CodeGenOpt::Level OptLevel,
256 ObjectCodeEmitter &OCE) {
257 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
259 addAssemblyEmitter(PM, OptLevel, true, ferrs());
264 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
265 CodeGenOpt::Level OptLevel,
267 MachineCodeEmitter &MCE) {
268 PM.add(createX86CodeEmitterPass(*this, MCE));
270 addAssemblyEmitter(PM, OptLevel, true, ferrs());
275 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
276 CodeGenOpt::Level OptLevel,
278 JITCodeEmitter &JCE) {
279 PM.add(createX86JITCodeEmitterPass(*this, JCE));
281 addAssemblyEmitter(PM, OptLevel, true, ferrs());
286 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
287 CodeGenOpt::Level OptLevel,
289 ObjectCodeEmitter &OCE) {
290 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
292 addAssemblyEmitter(PM, OptLevel, true, ferrs());