1 //===-- TargetMachine.cpp -------------------------------------------------===//
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 implements the LLVM-C part of TargetMachine.h
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm-c/Core.h"
15 #include "llvm-c/Target.h"
16 #include "llvm-c/TargetMachine.h"
17 #include "llvm/Analysis/TargetTransformInfo.h"
18 #include "llvm/CodeGen/TargetSubtargetInfo.h"
19 #include "llvm/IR/DataLayout.h"
20 #include "llvm/IR/LegacyPassManager.h"
21 #include "llvm/IR/Module.h"
22 #include "llvm/Support/CodeGenCWrappers.h"
23 #include "llvm/Support/FileSystem.h"
24 #include "llvm/Support/FormattedStream.h"
25 #include "llvm/Support/Host.h"
26 #include "llvm/Support/TargetRegistry.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include <cassert>
30 #include <cstdlib>
31 #include <cstring>
32 
33 using namespace llvm;
34 
35 static TargetMachine *unwrap(LLVMTargetMachineRef P) {
36   return reinterpret_cast<TargetMachine *>(P);
37 }
38 static Target *unwrap(LLVMTargetRef P) {
39   return reinterpret_cast<Target*>(P);
40 }
41 static LLVMTargetMachineRef wrap(const TargetMachine *P) {
42   return reinterpret_cast<LLVMTargetMachineRef>(const_cast<TargetMachine *>(P));
43 }
44 static LLVMTargetRef wrap(const Target * P) {
45   return reinterpret_cast<LLVMTargetRef>(const_cast<Target*>(P));
46 }
47 
48 LLVMTargetRef LLVMGetFirstTarget() {
49   if (TargetRegistry::targets().begin() == TargetRegistry::targets().end()) {
50     return nullptr;
51   }
52 
53   const Target *target = &*TargetRegistry::targets().begin();
54   return wrap(target);
55 }
56 LLVMTargetRef LLVMGetNextTarget(LLVMTargetRef T) {
57   return wrap(unwrap(T)->getNext());
58 }
59 
60 LLVMTargetRef LLVMGetTargetFromName(const char *Name) {
61   StringRef NameRef = Name;
62   auto I = find_if(TargetRegistry::targets(),
63                    [&](const Target &T) { return T.getName() == NameRef; });
64   return I != TargetRegistry::targets().end() ? wrap(&*I) : nullptr;
65 }
66 
67 LLVMBool LLVMGetTargetFromTriple(const char* TripleStr, LLVMTargetRef *T,
68                                  char **ErrorMessage) {
69   std::string Error;
70 
71   *T = wrap(TargetRegistry::lookupTarget(TripleStr, Error));
72 
73   if (!*T) {
74     if (ErrorMessage)
75       *ErrorMessage = strdup(Error.c_str());
76 
77     return 1;
78   }
79 
80   return 0;
81 }
82 
83 const char * LLVMGetTargetName(LLVMTargetRef T) {
84   return unwrap(T)->getName();
85 }
86 
87 const char * LLVMGetTargetDescription(LLVMTargetRef T) {
88   return unwrap(T)->getShortDescription();
89 }
90 
91 LLVMBool LLVMTargetHasJIT(LLVMTargetRef T) {
92   return unwrap(T)->hasJIT();
93 }
94 
95 LLVMBool LLVMTargetHasTargetMachine(LLVMTargetRef T) {
96   return unwrap(T)->hasTargetMachine();
97 }
98 
99 LLVMBool LLVMTargetHasAsmBackend(LLVMTargetRef T) {
100   return unwrap(T)->hasMCAsmBackend();
101 }
102 
103 LLVMTargetMachineRef LLVMCreateTargetMachine(LLVMTargetRef T,
104         const char *Triple, const char *CPU, const char *Features,
105         LLVMCodeGenOptLevel Level, LLVMRelocMode Reloc,
106         LLVMCodeModel CodeModel) {
107   Optional<Reloc::Model> RM;
108   switch (Reloc){
109     case LLVMRelocStatic:
110       RM = Reloc::Static;
111       break;
112     case LLVMRelocPIC:
113       RM = Reloc::PIC_;
114       break;
115     case LLVMRelocDynamicNoPic:
116       RM = Reloc::DynamicNoPIC;
117       break;
118     default:
119       break;
120   }
121 
122   bool JIT;
123   Optional<CodeModel::Model> CM = unwrap(CodeModel, JIT);
124 
125   CodeGenOpt::Level OL;
126   switch (Level) {
127     case LLVMCodeGenLevelNone:
128       OL = CodeGenOpt::None;
129       break;
130     case LLVMCodeGenLevelLess:
131       OL = CodeGenOpt::Less;
132       break;
133     case LLVMCodeGenLevelAggressive:
134       OL = CodeGenOpt::Aggressive;
135       break;
136     default:
137       OL = CodeGenOpt::Default;
138       break;
139   }
140 
141   TargetOptions opt;
142   return wrap(unwrap(T)->createTargetMachine(Triple, CPU, Features, opt, RM, CM,
143                                              OL, JIT));
144 }
145 
146 void LLVMDisposeTargetMachine(LLVMTargetMachineRef T) { delete unwrap(T); }
147 
148 LLVMTargetRef LLVMGetTargetMachineTarget(LLVMTargetMachineRef T) {
149   const Target* target = &(unwrap(T)->getTarget());
150   return wrap(target);
151 }
152 
153 char* LLVMGetTargetMachineTriple(LLVMTargetMachineRef T) {
154   std::string StringRep = unwrap(T)->getTargetTriple().str();
155   return strdup(StringRep.c_str());
156 }
157 
158 char* LLVMGetTargetMachineCPU(LLVMTargetMachineRef T) {
159   std::string StringRep = unwrap(T)->getTargetCPU();
160   return strdup(StringRep.c_str());
161 }
162 
163 char* LLVMGetTargetMachineFeatureString(LLVMTargetMachineRef T) {
164   std::string StringRep = unwrap(T)->getTargetFeatureString();
165   return strdup(StringRep.c_str());
166 }
167 
168 void LLVMSetTargetMachineAsmVerbosity(LLVMTargetMachineRef T,
169                                       LLVMBool VerboseAsm) {
170   unwrap(T)->Options.MCOptions.AsmVerbose = VerboseAsm;
171 }
172 
173 LLVMTargetDataRef LLVMCreateTargetDataLayout(LLVMTargetMachineRef T) {
174   return wrap(new DataLayout(unwrap(T)->createDataLayout()));
175 }
176 
177 static LLVMBool LLVMTargetMachineEmit(LLVMTargetMachineRef T, LLVMModuleRef M,
178                                       raw_pwrite_stream &OS,
179                                       LLVMCodeGenFileType codegen,
180                                       char **ErrorMessage) {
181   TargetMachine* TM = unwrap(T);
182   Module* Mod = unwrap(M);
183 
184   legacy::PassManager pass;
185 
186   std::string error;
187 
188   Mod->setDataLayout(TM->createDataLayout());
189 
190   TargetMachine::CodeGenFileType ft;
191   switch (codegen) {
192     case LLVMAssemblyFile:
193       ft = TargetMachine::CGFT_AssemblyFile;
194       break;
195     default:
196       ft = TargetMachine::CGFT_ObjectFile;
197       break;
198   }
199   if (TM->addPassesToEmitFile(pass, OS, ft)) {
200     error = "TargetMachine can't emit a file of this type";
201     *ErrorMessage = strdup(error.c_str());
202     return true;
203   }
204 
205   pass.run(*Mod);
206 
207   OS.flush();
208   return false;
209 }
210 
211 LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
212   char* Filename, LLVMCodeGenFileType codegen, char** ErrorMessage) {
213   std::error_code EC;
214   raw_fd_ostream dest(Filename, EC, sys::fs::F_None);
215   if (EC) {
216     *ErrorMessage = strdup(EC.message().c_str());
217     return true;
218   }
219   bool Result = LLVMTargetMachineEmit(T, M, dest, codegen, ErrorMessage);
220   dest.flush();
221   return Result;
222 }
223 
224 LLVMBool LLVMTargetMachineEmitToMemoryBuffer(LLVMTargetMachineRef T,
225   LLVMModuleRef M, LLVMCodeGenFileType codegen, char** ErrorMessage,
226   LLVMMemoryBufferRef *OutMemBuf) {
227   SmallString<0> CodeString;
228   raw_svector_ostream OStream(CodeString);
229   bool Result = LLVMTargetMachineEmit(T, M, OStream, codegen, ErrorMessage);
230 
231   StringRef Data = OStream.str();
232   *OutMemBuf =
233       LLVMCreateMemoryBufferWithMemoryRangeCopy(Data.data(), Data.size(), "");
234   return Result;
235 }
236 
237 char *LLVMGetDefaultTargetTriple(void) {
238   return strdup(sys::getDefaultTargetTriple().c_str());
239 }
240 
241 void LLVMAddAnalysisPasses(LLVMTargetMachineRef T, LLVMPassManagerRef PM) {
242   unwrap(PM)->add(
243       createTargetTransformInfoWrapperPass(unwrap(T)->getTargetIRAnalysis()));
244 }
245