ARMTargetMachine.cpp revision b8cab9227a0f6ffbdaae33e3c64268e265008a6a 
1//===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
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//
11//===----------------------------------------------------------------------===//
12
13#include "ARMTargetMachine.h"
14#include "ARMTargetAsmInfo.h"
15#include "ARMFrameInfo.h"
16#include "ARM.h"
17#include "llvm/Module.h"
18#include "llvm/PassManager.h"
19#include "llvm/CodeGen/Passes.h"
20#include "llvm/Support/CommandLine.h"
21#include "llvm/Support/raw_ostream.h"
22#include "llvm/Target/TargetMachineRegistry.h"
23#include "llvm/Target/TargetOptions.h"
24using namespace llvm;
25
26static cl::opt<bool> DisableLdStOpti("disable-arm-loadstore-opti", cl::Hidden,
27                              cl::desc("Disable load store optimization pass"));
28static cl::opt<bool> DisableIfConversion("disable-arm-if-conversion",cl::Hidden,
29                              cl::desc("Disable if-conversion pass"));
30
31// Register the target.
32static RegisterTarget<ARMTargetMachine>   X("arm",   "ARM");
33static RegisterTarget<ThumbTargetMachine> Y("thumb", "Thumb");
34
35// No assembler printer by default
36ARMTargetMachine::AsmPrinterCtorFn ARMTargetMachine::AsmPrinterCtor = 0;
37
38/// ThumbTargetMachine - Create an Thumb architecture model.
39///
40unsigned ThumbTargetMachine::getJITMatchQuality() {
41#if defined(__thumb__)
42  return 10;
43#endif
44  return 0;
45}
46
47unsigned ThumbTargetMachine::getModuleMatchQuality(const Module &M) {
48  std::string TT = M.getTargetTriple();
49  if (TT.size() >= 6 && std::string(TT.begin(), TT.begin()+6) == "thumb-")
50    return 20;
51
52  // If the target triple is something non-thumb, we don't match.
53  if (!TT.empty()) return 0;
54
55  if (M.getEndianness()  == Module::LittleEndian &&
56      M.getPointerSize() == Module::Pointer32)
57    return 10;                                   // Weak match
58  else if (M.getEndianness() != Module::AnyEndianness ||
59           M.getPointerSize() != Module::AnyPointerSize)
60    return 0;                                    // Match for some other target
61
62  return getJITMatchQuality()/2;
63}
64
65ThumbTargetMachine::ThumbTargetMachine(const Module &M, const std::string &FS)
66  : ARMTargetMachine(M, FS, true) {
67}
68
69/// TargetMachine ctor - Create an ARM architecture model.
70///
71ARMTargetMachine::ARMTargetMachine(const Module &M, const std::string &FS,
72                                   bool isThumb)
73  : Subtarget(M, FS, isThumb),
74    DataLayout(Subtarget.isAPCS_ABI() ?
75               // APCS ABI
76          (isThumb ?
77           std::string("e-p:32:32-f64:32:32-i64:32:32-"
78                       "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
79           std::string("e-p:32:32-f64:32:32-i64:32:32")) :
80               // AAPCS ABI
81          (isThumb ?
82           std::string("e-p:32:32-f64:64:64-i64:64:64-"
83                       "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
84           std::string("e-p:32:32-f64:64:64-i64:64:64"))),
85    InstrInfo(Subtarget),
86    FrameInfo(Subtarget),
87    JITInfo(*this),
88    TLInfo(*this) {}
89
90unsigned ARMTargetMachine::getJITMatchQuality() {
91#if defined(__arm__)
92  return 10;
93#endif
94  return 0;
95}
96
97unsigned ARMTargetMachine::getModuleMatchQuality(const Module &M) {
98  std::string TT = M.getTargetTriple();
99  if (TT.size() >= 4 && // Match arm-foo-bar, as well as things like armv5blah-*
100      (TT.substr(0, 4) == "arm-" || TT.substr(0, 4) == "armv"))
101    return 20;
102  // If the target triple is something non-arm, we don't match.
103  if (!TT.empty()) return 0;
104
105  if (M.getEndianness()  == Module::LittleEndian &&
106      M.getPointerSize() == Module::Pointer32)
107    return 10;                                   // Weak match
108  else if (M.getEndianness() != Module::AnyEndianness ||
109           M.getPointerSize() != Module::AnyPointerSize)
110    return 0;                                    // Match for some other target
111
112  return getJITMatchQuality()/2;
113}
114
115
116const TargetAsmInfo *ARMTargetMachine::createTargetAsmInfo() const {
117  switch (Subtarget.TargetType) {
118   case ARMSubtarget::isDarwin:
119    return new ARMDarwinTargetAsmInfo(*this);
120   case ARMSubtarget::isELF:
121    return new ARMELFTargetAsmInfo(*this);
122   default:
123    return new ARMGenericTargetAsmInfo(*this);
124  }
125}
126
127
128// Pass Pipeline Configuration
129bool ARMTargetMachine::addInstSelector(PassManagerBase &PM, bool Fast) {
130  PM.add(createARMISelDag(*this));
131  return false;
132}
133
134bool ARMTargetMachine::addPreEmitPass(PassManagerBase &PM, bool Fast) {
135  // FIXME: temporarily disabling load / store optimization pass for Thumb mode.
136  if (!Fast && !DisableLdStOpti && !Subtarget.isThumb())
137    PM.add(createARMLoadStoreOptimizationPass());
138
139  if (!Fast && !DisableIfConversion && !Subtarget.isThumb())
140    PM.add(createIfConverterPass());
141
142  PM.add(createARMConstantIslandPass());
143  return true;
144}
145
146bool ARMTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast,
147                                          raw_ostream &Out) {
148  // Output assembly language.
149  assert(AsmPrinterCtor && "AsmPrinter was not linked in");
150  if (AsmPrinterCtor)
151    PM.add(AsmPrinterCtor(Out, *this));
152
153  return false;
154}
155
156
157bool ARMTargetMachine::addCodeEmitter(PassManagerBase &PM, bool Fast,
158                                      bool DumpAsm, MachineCodeEmitter &MCE) {
159  // FIXME: Move this to TargetJITInfo!
160  setRelocationModel(Reloc::Static);
161
162  // Machine code emitter pass for ARM.
163  PM.add(createARMCodeEmitterPass(*this, MCE));
164  if (DumpAsm) {
165    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
166    if (AsmPrinterCtor)
167      PM.add(AsmPrinterCtor(errs(), *this));
168  }
169
170  return false;
171}
172
173bool ARMTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM, bool Fast,
174                                        bool DumpAsm, MachineCodeEmitter &MCE) {
175  // Machine code emitter pass for ARM.
176  PM.add(createARMCodeEmitterPass(*this, MCE));
177  if (DumpAsm) {
178    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
179    if (AsmPrinterCtor)
180      PM.add(AsmPrinterCtor(errs(), *this));
181  }
182
183  return false;
184}
185