PPCTargetMachine.cpp revision 5bcc8bd0c60cfe583ee47852950aad9e532c932e 
1//===-- PPCTargetMachine.cpp - Define TargetMachine for PowerPC -----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Top-level implementation for the PowerPC target.
11//
12//===----------------------------------------------------------------------===//
13
14#include "PPC.h"
15#include "PPCTargetAsmInfo.h"
16#include "PPCTargetMachine.h"
17#include "llvm/Module.h"
18#include "llvm/PassManager.h"
19#include "llvm/Target/TargetMachineRegistry.h"
20#include "llvm/Target/TargetOptions.h"
21#include "llvm/Support/raw_ostream.h"
22using namespace llvm;
23
24/// PowerPCTargetMachineModule - Note that this is used on hosts that
25/// cannot link in a library unless there are references into the
26/// library.  In particular, it seems that it is not possible to get
27/// things to work on Win32 without this.  Though it is unused, do not
28/// remove it.
29extern "C" int PowerPCTargetMachineModule;
30int PowerPCTargetMachineModule = 0;
31
32// Register the targets
33static RegisterTarget<PPC32TargetMachine>
34X("ppc32", "PowerPC 32");
35static RegisterTarget<PPC64TargetMachine>
36Y("ppc64", "PowerPC 64");
37
38// Force static initialization.
39extern "C" void LLVMInitializePowerPCTarget() { }
40
41// No assembler printer by default
42PPCTargetMachine::AsmPrinterCtorFn PPCTargetMachine::AsmPrinterCtor = 0;
43
44const TargetAsmInfo *PPCTargetMachine::createTargetAsmInfo() const {
45  if (Subtarget.isDarwin())
46    return new PPCDarwinTargetAsmInfo(*this);
47  else
48    return new PPCLinuxTargetAsmInfo(*this);
49}
50
51unsigned PPC32TargetMachine::getJITMatchQuality() {
52#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__)
53  if (sizeof(void*) == 4)
54    return 10;
55#endif
56  return 0;
57}
58unsigned PPC64TargetMachine::getJITMatchQuality() {
59#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__)
60  if (sizeof(void*) == 8)
61    return 10;
62#endif
63  return 0;
64}
65
66unsigned PPC32TargetMachine::getModuleMatchQuality(const Module &M) {
67  // We strongly match "powerpc-*".
68  std::string TT = M.getTargetTriple();
69  if (TT.size() >= 8 && std::string(TT.begin(), TT.begin()+8) == "powerpc-")
70    return 20;
71
72  // If the target triple is something non-powerpc, we don't match.
73  if (!TT.empty()) return 0;
74
75  if (M.getEndianness()  == Module::BigEndian &&
76      M.getPointerSize() == Module::Pointer32)
77    return 10;                                   // Weak match
78  else if (M.getEndianness() != Module::AnyEndianness ||
79           M.getPointerSize() != Module::AnyPointerSize)
80    return 0;                                    // Match for some other target
81
82  return getJITMatchQuality()/2;
83}
84
85unsigned PPC64TargetMachine::getModuleMatchQuality(const Module &M) {
86  // We strongly match "powerpc64-*".
87  std::string TT = M.getTargetTriple();
88  if (TT.size() >= 10 && std::string(TT.begin(), TT.begin()+10) == "powerpc64-")
89    return 20;
90
91  if (M.getEndianness()  == Module::BigEndian &&
92      M.getPointerSize() == Module::Pointer64)
93    return 10;                                   // Weak match
94  else if (M.getEndianness() != Module::AnyEndianness ||
95           M.getPointerSize() != Module::AnyPointerSize)
96    return 0;                                    // Match for some other target
97
98  return getJITMatchQuality()/2;
99}
100
101
102PPCTargetMachine::PPCTargetMachine(const Module &M, const std::string &FS,
103                                   bool is64Bit)
104  : Subtarget(*this, M, FS, is64Bit),
105    DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
106    FrameInfo(*this, is64Bit), JITInfo(*this, is64Bit), TLInfo(*this),
107    InstrItins(Subtarget.getInstrItineraryData()), MachOWriterInfo(*this) {
108
109  if (getRelocationModel() == Reloc::Default) {
110    if (Subtarget.isDarwin())
111      setRelocationModel(Reloc::DynamicNoPIC);
112    else
113      setRelocationModel(Reloc::Static);
114  }
115}
116
117/// Override this for PowerPC.  Tail merging happily breaks up instruction issue
118/// groups, which typically degrades performance.
119bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
120
121PPC32TargetMachine::PPC32TargetMachine(const Module &M, const std::string &FS)
122  : PPCTargetMachine(M, FS, false) {
123}
124
125
126PPC64TargetMachine::PPC64TargetMachine(const Module &M, const std::string &FS)
127  : PPCTargetMachine(M, FS, true) {
128}
129
130
131//===----------------------------------------------------------------------===//
132// Pass Pipeline Configuration
133//===----------------------------------------------------------------------===//
134
135bool PPCTargetMachine::addInstSelector(PassManagerBase &PM,
136                                       CodeGenOpt::Level OptLevel) {
137  // Install an instruction selector.
138  PM.add(createPPCISelDag(*this));
139  return false;
140}
141
142bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM,
143                                      CodeGenOpt::Level OptLevel) {
144  // Must run branch selection immediately preceding the asm printer.
145  PM.add(createPPCBranchSelectionPass());
146  return false;
147}
148
149bool PPCTargetMachine::addAssemblyEmitter(PassManagerBase &PM,
150                                          CodeGenOpt::Level OptLevel,
151                                          bool Verbose,
152                                          raw_ostream &Out) {
153  assert(AsmPrinterCtor && "AsmPrinter was not linked in");
154  if (AsmPrinterCtor)
155    PM.add(AsmPrinterCtor(Out, *this, Verbose));
156
157  return false;
158}
159
160bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
161                                      CodeGenOpt::Level OptLevel,
162                                      bool DumpAsm, MachineCodeEmitter &MCE) {
163  // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
164  // FIXME: This should be moved to TargetJITInfo!!
165  if (Subtarget.isPPC64()) {
166    // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
167    // instructions to materialize arbitrary global variable + function +
168    // constant pool addresses.
169    setRelocationModel(Reloc::PIC_);
170    // Temporary workaround for the inability of PPC64 JIT to handle jump
171    // tables.
172    DisableJumpTables = true;
173  } else {
174    setRelocationModel(Reloc::Static);
175  }
176
177  // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
178  // writing?
179  Subtarget.SetJITMode();
180
181  // Machine code emitter pass for PowerPC.
182  PM.add(createPPCCodeEmitterPass(*this, MCE));
183  if (DumpAsm) {
184    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
185    if (AsmPrinterCtor)
186      PM.add(AsmPrinterCtor(errs(), *this, true));
187  }
188
189  return false;
190}
191
192bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
193                                      CodeGenOpt::Level OptLevel,
194                                      bool DumpAsm, JITCodeEmitter &JCE) {
195  // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
196  // FIXME: This should be moved to TargetJITInfo!!
197  if (Subtarget.isPPC64()) {
198    // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
199    // instructions to materialize arbitrary global variable + function +
200    // constant pool addresses.
201    setRelocationModel(Reloc::PIC_);
202    // Temporary workaround for the inability of PPC64 JIT to handle jump
203    // tables.
204    DisableJumpTables = true;
205  } else {
206    setRelocationModel(Reloc::Static);
207  }
208
209  // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
210  // writing?
211  Subtarget.SetJITMode();
212
213  // Machine code emitter pass for PowerPC.
214  PM.add(createPPCJITCodeEmitterPass(*this, JCE));
215  if (DumpAsm) {
216    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
217    if (AsmPrinterCtor)
218      PM.add(AsmPrinterCtor(errs(), *this, true));
219  }
220
221  return false;
222}
223
224bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
225                                            CodeGenOpt::Level OptLevel,
226                                            bool DumpAsm,
227                                            MachineCodeEmitter &MCE) {
228  // Machine code emitter pass for PowerPC.
229  PM.add(createPPCCodeEmitterPass(*this, MCE));
230  if (DumpAsm) {
231    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
232    if (AsmPrinterCtor)
233      PM.add(AsmPrinterCtor(errs(), *this, true));
234  }
235
236  return false;
237}
238
239bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
240                                            CodeGenOpt::Level OptLevel,
241                                            bool DumpAsm,
242                                            JITCodeEmitter &JCE) {
243  // Machine code emitter pass for PowerPC.
244  PM.add(createPPCJITCodeEmitterPass(*this, JCE));
245  if (DumpAsm) {
246    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
247    if (AsmPrinterCtor)
248      PM.add(AsmPrinterCtor(errs(), *this, true));
249  }
250
251  return false;
252}
253
254