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/Transforms/Scalar.h"
15 #include "llvm/PassManager.h"
16 #include "llvm/Assembly/PrintModulePass.h"
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/Passes.h"
19 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
20 #include "llvm/CodeGen/MachineModuleInfo.h"
21 #include "llvm/Target/TargetInstrInfo.h"
22 #include "llvm/Target/TargetLowering.h"
23 #include "llvm/Target/TargetLoweringObjectFile.h"
24 #include "llvm/Target/TargetMachine.h"
25 #include "llvm/Target/TargetOptions.h"
26 #include "llvm/Target/TargetSubtargetInfo.h"
27 #include "llvm/Target/TargetRegisterInfo.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCInstrInfo.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSubtargetInfo.h"
33 #include "llvm/ADT/OwningPtr.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/FormattedStream.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/TargetRegistry.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->addPassesToHandleExceptions();
101 PassConfig->addISelPrepare();
103 // Install a MachineModuleInfo class, which is an immutable pass that holds
104 // all the per-module stuff we're generating, including MCContext.
105 MachineModuleInfo *MMI =
106 new MachineModuleInfo(*TM->getMCAsmInfo(), *TM->getRegisterInfo(),
107 &TM->getTargetLowering()->getObjFileLowering());
109 MCContext *Context = &MMI->getContext(); // Return the MCContext by-ref.
111 // Set up a MachineFunction for the rest of CodeGen to work on.
112 PM.add(new MachineFunctionAnalysis(*TM));
114 // Enable FastISel with -fast, but allow that to be overridden.
115 if (EnableFastISelOption == cl::BOU_TRUE ||
116 (TM->getOptLevel() == CodeGenOpt::None &&
117 EnableFastISelOption != cl::BOU_FALSE))
118 TM->setFastISel(true);
120 // Ask the target for an isel.
121 if (PassConfig->addInstSelector())
124 PassConfig->addMachinePasses();
126 PassConfig->setInitialized();
131 bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
132 formatted_raw_ostream &Out,
133 CodeGenFileType FileType,
135 AnalysisID StartAfter,
136 AnalysisID StopAfter) {
137 // Add common CodeGen passes.
138 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify,
139 StartAfter, StopAfter);
144 // FIXME: The intent is that this should eventually write out a YAML file,
145 // containing the LLVM IR, the machine-level IR (when stopping after a
146 // machine-level pass), and whatever other information is needed to
147 // deserialize the code and resume compilation. For now, just write the
149 PM.add(createPrintModulePass(&Out));
153 if (hasMCSaveTempLabels())
154 Context->setAllowTemporaryLabels(false);
156 const MCAsmInfo &MAI = *getMCAsmInfo();
157 const MCRegisterInfo &MRI = *getRegisterInfo();
158 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
159 OwningPtr<MCStreamer> AsmStreamer;
162 case CGFT_AssemblyFile: {
163 MCInstPrinter *InstPrinter =
164 getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI,
166 Context->getRegisterInfo(), STI);
168 // Create a code emitter if asked to show the encoding.
169 MCCodeEmitter *MCE = 0;
170 MCAsmBackend *MAB = 0;
171 if (ShowMCEncoding) {
172 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
173 MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, STI,
175 MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
178 MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
182 hasMCUseDwarfDirectory(),
186 AsmStreamer.reset(S);
189 case CGFT_ObjectFile: {
190 // Create the code emitter for the target if it exists. If not, .o file
192 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
194 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(),
196 if (MCE == 0 || MAB == 0)
199 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(),
201 MCE, hasMCRelaxAll(),
202 hasMCNoExecStack()));
203 AsmStreamer.get()->InitSections();
207 // The Null output is intended for use for performance analysis and testing,
209 AsmStreamer.reset(createNullStreamer(*Context));
213 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
214 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
218 // If successful, createAsmPrinter took ownership of AsmStreamer.
223 PM.add(createGCInfoDeleter());
227 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
228 /// get machine code emitted. This uses a JITCodeEmitter object to handle
229 /// actually outputting the machine code and resolving things like the address
230 /// of functions. This method should returns true if machine code emission is
233 bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
235 bool DisableVerify) {
236 // Add common CodeGen passes.
237 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0);
241 addCodeEmitter(PM, JCE);
242 PM.add(createGCInfoDeleter());
244 return false; // success!
247 /// addPassesToEmitMC - Add passes to the specified pass manager to get
248 /// machine code emitted with the MCJIT. This method returns true if machine
249 /// code is not supported. It fills the MCContext Ctx pointer which can be
250 /// used to build custom MCStreamer.
252 bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM,
255 bool DisableVerify) {
256 // Add common CodeGen passes.
257 Ctx = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0);
261 if (hasMCSaveTempLabels())
262 Ctx->setAllowTemporaryLabels(false);
264 // Create the code emitter for the target if it exists. If not, .o file
266 const MCRegisterInfo &MRI = *getRegisterInfo();
267 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
268 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
270 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
271 if (MCE == 0 || MAB == 0)
274 OwningPtr<MCStreamer> AsmStreamer;
275 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), *Ctx,
278 hasMCNoExecStack()));
279 AsmStreamer.get()->InitSections();
281 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
282 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
286 // If successful, createAsmPrinter took ownership of AsmStreamer.
291 return false; // success!