1 //===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
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 implements the LLVMTargetMachine class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Target/TargetMachine.h"
15 #include "llvm/ADT/OwningPtr.h"
16 #include "llvm/Assembly/PrintModulePass.h"
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
19 #include "llvm/CodeGen/MachineModuleInfo.h"
20 #include "llvm/CodeGen/Passes.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCInstrInfo.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/PassManager.h"
27 #include "llvm/Support/CommandLine.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/FormattedStream.h"
30 #include "llvm/Support/TargetRegistry.h"
31 #include "llvm/Target/TargetInstrInfo.h"
32 #include "llvm/Target/TargetLowering.h"
33 #include "llvm/Target/TargetLoweringObjectFile.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/Target/TargetRegisterInfo.h"
36 #include "llvm/Target/TargetSubtargetInfo.h"
37 #include "llvm/Transforms/Scalar.h"
40 // Enable or disable FastISel. Both options are needed, because
41 // FastISel is enabled by default with -fast, and we wish to be
42 // able to enable or disable fast-isel independently from -O0.
43 static cl::opt<cl::boolOrDefault>
44 EnableFastISelOption("fast-isel", cl::Hidden,
45 cl::desc("Enable the \"fast\" instruction selector"));
47 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
48 cl::desc("Show encoding in .s output"));
49 static cl::opt<bool> ShowMCInst("show-mc-inst", cl::Hidden,
50 cl::desc("Show instruction structure in .s output"));
52 static cl::opt<cl::boolOrDefault>
53 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
54 cl::init(cl::BOU_UNSET));
56 static bool getVerboseAsm() {
58 case cl::BOU_UNSET: return TargetMachine::getAsmVerbosityDefault();
59 case cl::BOU_TRUE: return true;
60 case cl::BOU_FALSE: return false;
62 llvm_unreachable("Invalid verbose asm state");
65 LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
66 StringRef CPU, StringRef FS,
67 TargetOptions Options,
68 Reloc::Model RM, CodeModel::Model CM,
70 : TargetMachine(T, Triple, CPU, FS, Options) {
71 CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM, OL);
72 AsmInfo = T.createMCAsmInfo(Triple);
73 // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
74 // and if the old one gets included then MCAsmInfo will be NULL and
76 // Provide the user with a useful error message about what's wrong.
77 assert(AsmInfo && "MCAsmInfo not initialized."
78 "Make sure you include the correct TargetSelect.h"
79 "and that InitializeAllTargetMCs() is being invoked!");
82 /// addPassesToX helper drives creation and initialization of TargetPassConfig.
83 static MCContext *addPassesToGenerateCode(LLVMTargetMachine *TM,
86 AnalysisID StartAfter,
87 AnalysisID StopAfter) {
88 // Targets may override createPassConfig to provide a target-specific sublass.
89 TargetPassConfig *PassConfig = TM->createPassConfig(PM);
90 PassConfig->setStartStopPasses(StartAfter, StopAfter);
92 // Set PassConfig options provided by TargetMachine.
93 PassConfig->setDisableVerify(DisableVerify);
97 PassConfig->addIRPasses();
99 PassConfig->addCodeGenPrepare();
101 PassConfig->addPassesToHandleExceptions();
103 PassConfig->addISelPrepare();
105 // Install a MachineModuleInfo class, which is an immutable pass that holds
106 // all the per-module stuff we're generating, including MCContext.
107 MachineModuleInfo *MMI =
108 new MachineModuleInfo(*TM->getMCAsmInfo(), *TM->getRegisterInfo(),
109 &TM->getTargetLowering()->getObjFileLowering());
111 MCContext *Context = &MMI->getContext(); // Return the MCContext by-ref.
113 // Set up a MachineFunction for the rest of CodeGen to work on.
114 PM.add(new MachineFunctionAnalysis(*TM));
116 // Enable FastISel with -fast, but allow that to be overridden.
117 if (EnableFastISelOption == cl::BOU_TRUE ||
118 (TM->getOptLevel() == CodeGenOpt::None &&
119 EnableFastISelOption != cl::BOU_FALSE))
120 TM->setFastISel(true);
122 // Ask the target for an isel.
123 if (PassConfig->addInstSelector())
126 PassConfig->addMachinePasses();
128 PassConfig->setInitialized();
133 bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
134 formatted_raw_ostream &Out,
135 CodeGenFileType FileType,
137 AnalysisID StartAfter,
138 AnalysisID StopAfter) {
139 // Add common CodeGen passes.
140 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify,
141 StartAfter, StopAfter);
146 // FIXME: The intent is that this should eventually write out a YAML file,
147 // containing the LLVM IR, the machine-level IR (when stopping after a
148 // machine-level pass), and whatever other information is needed to
149 // deserialize the code and resume compilation. For now, just write the
151 PM.add(createPrintModulePass(&Out));
155 if (hasMCSaveTempLabels())
156 Context->setAllowTemporaryLabels(false);
158 const MCAsmInfo &MAI = *getMCAsmInfo();
159 const MCRegisterInfo &MRI = *getRegisterInfo();
160 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
161 OwningPtr<MCStreamer> AsmStreamer;
164 case CGFT_AssemblyFile: {
165 MCInstPrinter *InstPrinter =
166 getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI,
168 Context->getRegisterInfo(), STI);
170 // Create a code emitter if asked to show the encoding.
171 MCCodeEmitter *MCE = 0;
172 MCAsmBackend *MAB = 0;
173 if (ShowMCEncoding) {
174 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
175 MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, STI,
177 MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
180 MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
184 hasMCUseDwarfDirectory(),
188 AsmStreamer.reset(S);
191 case CGFT_ObjectFile: {
192 // Create the code emitter for the target if it exists. If not, .o file
194 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
196 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(),
198 if (MCE == 0 || MAB == 0)
201 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(),
203 MCE, hasMCRelaxAll(),
204 hasMCNoExecStack()));
205 AsmStreamer.get()->InitSections();
209 // The Null output is intended for use for performance analysis and testing,
211 AsmStreamer.reset(createNullStreamer(*Context));
215 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
216 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
220 // If successful, createAsmPrinter took ownership of AsmStreamer.
225 PM.add(createGCInfoDeleter());
229 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
230 /// get machine code emitted. This uses a JITCodeEmitter object to handle
231 /// actually outputting the machine code and resolving things like the address
232 /// of functions. This method should returns true if machine code emission is
235 bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
237 bool DisableVerify) {
238 // Add common CodeGen passes.
239 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0);
243 addCodeEmitter(PM, JCE);
244 PM.add(createGCInfoDeleter());
246 return false; // success!
249 /// addPassesToEmitMC - Add passes to the specified pass manager to get
250 /// machine code emitted with the MCJIT. This method returns true if machine
251 /// code is not supported. It fills the MCContext Ctx pointer which can be
252 /// used to build custom MCStreamer.
254 bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM,
257 bool DisableVerify) {
258 // Add common CodeGen passes.
259 Ctx = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0);
263 if (hasMCSaveTempLabels())
264 Ctx->setAllowTemporaryLabels(false);
266 // Create the code emitter for the target if it exists. If not, .o file
268 const MCRegisterInfo &MRI = *getRegisterInfo();
269 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
270 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
272 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
273 if (MCE == 0 || MAB == 0)
276 OwningPtr<MCStreamer> AsmStreamer;
277 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), *Ctx,
280 hasMCNoExecStack()));
281 AsmStreamer.get()->InitSections();
283 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
284 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
288 // If successful, createAsmPrinter took ownership of AsmStreamer.
293 return false; // success!