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/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/Passes.h"
18 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
19 #include "llvm/CodeGen/MachineModuleInfo.h"
20 #include "llvm/Target/TargetInstrInfo.h"
21 #include "llvm/Target/TargetLowering.h"
22 #include "llvm/Target/TargetLoweringObjectFile.h"
23 #include "llvm/Target/TargetMachine.h"
24 #include "llvm/Target/TargetOptions.h"
25 #include "llvm/Target/TargetSubtargetInfo.h"
26 #include "llvm/Target/TargetRegisterInfo.h"
27 #include "llvm/MC/MCAsmInfo.h"
28 #include "llvm/MC/MCContext.h"
29 #include "llvm/MC/MCInstrInfo.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSubtargetInfo.h"
32 #include "llvm/ADT/OwningPtr.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/FormattedStream.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/TargetRegistry.h"
39 // Enable or disable FastISel. Both options are needed, because
40 // FastISel is enabled by default with -fast, and we wish to be
41 // able to enable or disable fast-isel independently from -O0.
42 static cl::opt<cl::boolOrDefault>
43 EnableFastISelOption("fast-isel", cl::Hidden,
44 cl::desc("Enable the \"fast\" instruction selector"));
46 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
47 cl::desc("Show encoding in .s output"));
48 static cl::opt<bool> ShowMCInst("show-mc-inst", cl::Hidden,
49 cl::desc("Show instruction structure in .s output"));
51 static cl::opt<cl::boolOrDefault>
52 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
53 cl::init(cl::BOU_UNSET));
55 static bool getVerboseAsm() {
57 case cl::BOU_UNSET: return TargetMachine::getAsmVerbosityDefault();
58 case cl::BOU_TRUE: return true;
59 case cl::BOU_FALSE: return false;
61 llvm_unreachable("Invalid verbose asm state");
64 LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
65 StringRef CPU, StringRef FS,
66 TargetOptions Options,
67 Reloc::Model RM, CodeModel::Model CM,
69 : TargetMachine(T, Triple, CPU, FS, Options) {
70 CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM, OL);
71 AsmInfo = T.createMCAsmInfo(Triple);
72 // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
73 // and if the old one gets included then MCAsmInfo will be NULL and
75 // Provide the user with a useful error message about what's wrong.
76 assert(AsmInfo && "MCAsmInfo not initialized."
77 "Make sure you include the correct TargetSelect.h"
78 "and that InitializeAllTargetMCs() is being invoked!");
81 /// addPassesToX helper drives creation and initialization of TargetPassConfig.
82 static MCContext *addPassesToGenerateCode(LLVMTargetMachine *TM,
85 // Targets may override createPassConfig to provide a target-specific sublass.
86 TargetPassConfig *PassConfig = TM->createPassConfig(PM);
88 // Set PassConfig options provided by TargetMachine.
89 PassConfig->setDisableVerify(DisableVerify);
93 PassConfig->addIRPasses();
95 PassConfig->addPassesToHandleExceptions();
97 PassConfig->addISelPrepare();
99 // Install a MachineModuleInfo class, which is an immutable pass that holds
100 // all the per-module stuff we're generating, including MCContext.
101 MachineModuleInfo *MMI =
102 new MachineModuleInfo(*TM->getMCAsmInfo(), *TM->getRegisterInfo(),
103 &TM->getTargetLowering()->getObjFileLowering());
105 MCContext *Context = &MMI->getContext(); // Return the MCContext by-ref.
107 // Set up a MachineFunction for the rest of CodeGen to work on.
108 PM.add(new MachineFunctionAnalysis(*TM));
110 // Enable FastISel with -fast, but allow that to be overridden.
111 if (EnableFastISelOption == cl::BOU_TRUE ||
112 (TM->getOptLevel() == CodeGenOpt::None &&
113 EnableFastISelOption != cl::BOU_FALSE))
114 TM->setFastISel(true);
116 // Ask the target for an isel.
117 if (PassConfig->addInstSelector())
120 PassConfig->addMachinePasses();
122 PassConfig->setInitialized();
127 bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
128 formatted_raw_ostream &Out,
129 CodeGenFileType FileType,
130 bool DisableVerify) {
131 // Add common CodeGen passes.
132 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify);
136 if (hasMCSaveTempLabels())
137 Context->setAllowTemporaryLabels(false);
139 const MCAsmInfo &MAI = *getMCAsmInfo();
140 const MCRegisterInfo &MRI = *getRegisterInfo();
141 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
142 OwningPtr<MCStreamer> AsmStreamer;
145 case CGFT_AssemblyFile: {
146 MCInstPrinter *InstPrinter =
147 getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI,
149 Context->getRegisterInfo(), STI);
151 // Create a code emitter if asked to show the encoding.
152 MCCodeEmitter *MCE = 0;
153 MCAsmBackend *MAB = 0;
154 if (ShowMCEncoding) {
155 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
156 MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, STI,
158 MAB = getTarget().createMCAsmBackend(getTargetTriple());
161 MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
165 hasMCUseDwarfDirectory(),
169 AsmStreamer.reset(S);
172 case CGFT_ObjectFile: {
173 // Create the code emitter for the target if it exists. If not, .o file
175 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
177 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple());
178 if (MCE == 0 || MAB == 0)
181 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(),
183 MCE, hasMCRelaxAll(),
184 hasMCNoExecStack()));
185 AsmStreamer.get()->InitSections();
189 // The Null output is intended for use for performance analysis and testing,
191 AsmStreamer.reset(createNullStreamer(*Context));
195 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
196 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
200 // If successful, createAsmPrinter took ownership of AsmStreamer.
205 PM.add(createGCInfoDeleter());
209 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
210 /// get machine code emitted. This uses a JITCodeEmitter object to handle
211 /// actually outputting the machine code and resolving things like the address
212 /// of functions. This method should returns true if machine code emission is
215 bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
217 bool DisableVerify) {
218 // Add common CodeGen passes.
219 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify);
223 addCodeEmitter(PM, JCE);
224 PM.add(createGCInfoDeleter());
226 return false; // success!
229 /// addPassesToEmitMC - Add passes to the specified pass manager to get
230 /// machine code emitted with the MCJIT. This method returns true if machine
231 /// code is not supported. It fills the MCContext Ctx pointer which can be
232 /// used to build custom MCStreamer.
234 bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM,
237 bool DisableVerify) {
238 // Add common CodeGen passes.
239 Ctx = addPassesToGenerateCode(this, PM, DisableVerify);
243 if (hasMCSaveTempLabels())
244 Ctx->setAllowTemporaryLabels(false);
246 // Create the code emitter for the target if it exists. If not, .o file
248 const MCRegisterInfo &MRI = *getRegisterInfo();
249 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
250 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
252 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple());
253 if (MCE == 0 || MAB == 0)
256 OwningPtr<MCStreamer> AsmStreamer;
257 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), *Ctx,
260 hasMCNoExecStack()));
261 AsmStreamer.get()->InitSections();
263 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
264 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer);
268 // If successful, createAsmPrinter took ownership of AsmStreamer.
273 return false; // success!