1 //===-- TargetMachine.cpp - General Target Information ---------------------==//
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 // This file describes the general parts of a Target machine.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/GlobalValue.h"
15 #include "llvm/MC/MCAsmInfo.h"
16 #include "llvm/MC/MCCodeGenInfo.h"
17 #include "llvm/Target/TargetMachine.h"
18 #include "llvm/Support/CommandLine.h"
19 using namespace llvm;
20
21 //---------------------------------------------------------------------------
22 // Command-line options that tend to be useful on more than one back-end.
23 //
24
25 namespace llvm {
26 bool HasDivModLibcall;
27 bool AsmVerbosityDefault(false);
28 }
29
30 static cl::opt<bool>
31 DataSections("fdata-sections",
32 cl::desc("Emit data into separate sections"),
33 cl::init(false));
34 static cl::opt<bool>
35 FunctionSections("ffunction-sections",
36 cl::desc("Emit functions into separate sections"),
37 cl::init(false));
38
39 //---------------------------------------------------------------------------
40 // TargetMachine Class
41 //
42
TargetMachine(const Target & T,StringRef TT,StringRef CPU,StringRef FS,const TargetOptions & Options)43 TargetMachine::TargetMachine(const Target &T,
44 StringRef TT, StringRef CPU, StringRef FS,
45 const TargetOptions &Options)
46 : TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
47 CodeGenInfo(0), AsmInfo(0),
48 MCRelaxAll(false),
49 MCNoExecStack(false),
50 MCSaveTempLabels(false),
51 MCUseLoc(true),
52 MCUseCFI(true),
53 MCUseDwarfDirectory(false),
54 Options(Options) {
55 }
56
~TargetMachine()57 TargetMachine::~TargetMachine() {
58 delete CodeGenInfo;
59 delete AsmInfo;
60 }
61
62 /// getRelocationModel - Returns the code generation relocation model. The
63 /// choices are static, PIC, and dynamic-no-pic, and target default.
getRelocationModel() const64 Reloc::Model TargetMachine::getRelocationModel() const {
65 if (!CodeGenInfo)
66 return Reloc::Default;
67 return CodeGenInfo->getRelocationModel();
68 }
69
70 /// getCodeModel - Returns the code model. The choices are small, kernel,
71 /// medium, large, and target default.
getCodeModel() const72 CodeModel::Model TargetMachine::getCodeModel() const {
73 if (!CodeGenInfo)
74 return CodeModel::Default;
75 return CodeGenInfo->getCodeModel();
76 }
77
getTLSModel(const GlobalValue * GV) const78 TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
79 bool isLocal = GV->hasLocalLinkage();
80 bool isDeclaration = GV->isDeclaration();
81 // FIXME: what should we do for protected and internal visibility?
82 // For variables, is internal different from hidden?
83 bool isHidden = GV->hasHiddenVisibility();
84
85 if (getRelocationModel() == Reloc::PIC_ &&
86 !Options.PositionIndependentExecutable) {
87 if (isLocal || isHidden)
88 return TLSModel::LocalDynamic;
89 else
90 return TLSModel::GeneralDynamic;
91 } else {
92 if (!isDeclaration || isHidden)
93 return TLSModel::LocalExec;
94 else
95 return TLSModel::InitialExec;
96 }
97 }
98
99 /// getOptLevel - Returns the optimization level: None, Less,
100 /// Default, or Aggressive.
getOptLevel() const101 CodeGenOpt::Level TargetMachine::getOptLevel() const {
102 if (!CodeGenInfo)
103 return CodeGenOpt::Default;
104 return CodeGenInfo->getOptLevel();
105 }
106
getAsmVerbosityDefault()107 bool TargetMachine::getAsmVerbosityDefault() {
108 return AsmVerbosityDefault;
109 }
110
setAsmVerbosityDefault(bool V)111 void TargetMachine::setAsmVerbosityDefault(bool V) {
112 AsmVerbosityDefault = V;
113 }
114
getFunctionSections()115 bool TargetMachine::getFunctionSections() {
116 return FunctionSections;
117 }
118
getDataSections()119 bool TargetMachine::getDataSections() {
120 return DataSections;
121 }
122
setFunctionSections(bool V)123 void TargetMachine::setFunctionSections(bool V) {
124 FunctionSections = V;
125 }
126
setDataSections(bool V)127 void TargetMachine::setDataSections(bool V) {
128 DataSections = V;
129 }
130
131