1 //===-- llvm/Target/TargetMachine.h - Target Information --------*- C++ -*-===//
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 defines the TargetMachine and LLVMTargetMachine classes.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TARGET_TARGETMACHINE_H
15 #define LLVM_TARGET_TARGETMACHINE_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Pass.h"
19 #include "llvm/Support/CodeGen.h"
20 #include "llvm/Target/TargetOptions.h"
26 class InstrItineraryData;
34 class TargetLibraryInfo;
35 class TargetFrameLowering;
36 class TargetInstrInfo;
37 class TargetIntrinsicInfo;
40 class TargetPassConfig;
41 class TargetRegisterInfo;
42 class TargetSelectionDAGInfo;
43 class TargetSubtargetInfo;
44 class ScalarTargetTransformInfo;
45 class VectorTargetTransformInfo;
46 class formatted_raw_ostream;
49 // The old pass manager infrastructure is hidden in a legacy namespace now.
51 class PassManagerBase;
53 using legacy::PassManagerBase;
55 //===----------------------------------------------------------------------===//
57 /// TargetMachine - Primary interface to the complete machine description for
58 /// the target machine. All target-specific information should be accessible
59 /// through this interface.
62 TargetMachine(const TargetMachine &) LLVM_DELETED_FUNCTION;
63 void operator=(const TargetMachine &) LLVM_DELETED_FUNCTION;
64 protected: // Can only create subclasses.
65 TargetMachine(const Target &T, StringRef TargetTriple,
66 StringRef CPU, StringRef FS, const TargetOptions &Options);
68 /// TheTarget - The Target that this machine was created for.
69 const Target &TheTarget;
71 /// TargetTriple, TargetCPU, TargetFS - Triple string, CPU name, and target
72 /// feature strings the TargetMachine instance is created with.
73 std::string TargetTriple;
74 std::string TargetCPU;
77 /// CodeGenInfo - Low level target information such as relocation model.
78 /// Non-const to allow resetting optimization level per-function.
79 MCCodeGenInfo *CodeGenInfo;
81 /// AsmInfo - Contains target specific asm information.
83 const MCAsmInfo *AsmInfo;
85 unsigned MCRelaxAll : 1;
86 unsigned MCNoExecStack : 1;
87 unsigned MCSaveTempLabels : 1;
88 unsigned MCUseLoc : 1;
89 unsigned MCUseCFI : 1;
90 unsigned MCUseDwarfDirectory : 1;
91 unsigned DebugUseUniqueSections : 1;
92 unsigned RequireStructuredCFG : 1;
95 virtual ~TargetMachine();
97 const Target &getTarget() const { return TheTarget; }
99 const StringRef getTargetTriple() const { return TargetTriple; }
100 const StringRef getTargetCPU() const { return TargetCPU; }
101 const StringRef getTargetFeatureString() const { return TargetFS; }
103 /// getSubtargetImpl - virtual method implemented by subclasses that returns
104 /// a reference to that target's TargetSubtargetInfo-derived member variable.
105 virtual const TargetSubtargetInfo *getSubtargetImpl() const { return 0; }
107 mutable TargetOptions Options;
109 /// \brief Reset the target options based on the function's attributes.
110 void resetTargetOptions(const MachineFunction *MF) const;
112 // Interfaces to the major aspects of target machine information:
114 // -- Instruction opcode and operand information
115 // -- Pipelines and scheduling information
116 // -- Stack frame information
117 // -- Selection DAG lowering information
119 // N.B. These objects may change during compilation. It's not safe to cache
120 // them between functions.
121 virtual const TargetInstrInfo *getInstrInfo() const { return 0; }
122 virtual const TargetFrameLowering *getFrameLowering() const { return 0; }
123 virtual const TargetLowering *getTargetLowering() const { return 0; }
124 virtual const TargetSelectionDAGInfo *getSelectionDAGInfo() const{ return 0; }
125 virtual const DataLayout *getDataLayout() const { return 0; }
127 /// getMCAsmInfo - Return target specific asm information.
129 const MCAsmInfo *getMCAsmInfo() const { return AsmInfo; }
131 /// getSubtarget - This method returns a pointer to the specified type of
132 /// TargetSubtargetInfo. In debug builds, it verifies that the object being
133 /// returned is of the correct type.
134 template<typename STC> const STC &getSubtarget() const {
135 return *static_cast<const STC*>(getSubtargetImpl());
138 /// getRegisterInfo - If register information is available, return it. If
139 /// not, return null. This is kept separate from RegInfo until RegInfo has
140 /// details of graph coloring register allocation removed from it.
142 virtual const TargetRegisterInfo *getRegisterInfo() const { return 0; }
144 /// getIntrinsicInfo - If intrinsic information is available, return it. If
145 /// not, return null.
147 virtual const TargetIntrinsicInfo *getIntrinsicInfo() const { return 0; }
149 /// getJITInfo - If this target supports a JIT, return information for it,
150 /// otherwise return null.
152 virtual TargetJITInfo *getJITInfo() { return 0; }
154 /// getInstrItineraryData - Returns instruction itinerary data for the target
155 /// or specific subtarget.
157 virtual const InstrItineraryData *getInstrItineraryData() const {
161 bool requiresStructuredCFG() const { return RequireStructuredCFG; }
162 void setRequiresStructuredCFG(bool Value) { RequireStructuredCFG = Value; }
164 bool debugUseUniqueSections() const { return DebugUseUniqueSections; }
165 void setDebugUseUniqueSections(bool Value) { DebugUseUniqueSections = Value; }
167 /// hasMCRelaxAll - Check whether all machine code instructions should be
169 bool hasMCRelaxAll() const { return MCRelaxAll; }
171 /// setMCRelaxAll - Set whether all machine code instructions should be
173 void setMCRelaxAll(bool Value) { MCRelaxAll = Value; }
175 /// hasMCSaveTempLabels - Check whether temporary labels will be preserved
176 /// (i.e., not treated as temporary).
177 bool hasMCSaveTempLabels() const { return MCSaveTempLabels; }
179 /// setMCSaveTempLabels - Set whether temporary labels will be preserved
180 /// (i.e., not treated as temporary).
181 void setMCSaveTempLabels(bool Value) { MCSaveTempLabels = Value; }
183 /// hasMCNoExecStack - Check whether an executable stack is not needed.
184 bool hasMCNoExecStack() const { return MCNoExecStack; }
186 /// setMCNoExecStack - Set whether an executabel stack is not needed.
187 void setMCNoExecStack(bool Value) { MCNoExecStack = Value; }
189 /// hasMCUseLoc - Check whether we should use dwarf's .loc directive.
190 bool hasMCUseLoc() const { return MCUseLoc; }
192 /// setMCUseLoc - Set whether all we should use dwarf's .loc directive.
193 void setMCUseLoc(bool Value) { MCUseLoc = Value; }
195 /// hasMCUseCFI - Check whether we should use dwarf's .cfi_* directives.
196 bool hasMCUseCFI() const { return MCUseCFI; }
198 /// setMCUseCFI - Set whether all we should use dwarf's .cfi_* directives.
199 void setMCUseCFI(bool Value) { MCUseCFI = Value; }
201 /// hasMCUseDwarfDirectory - Check whether we should use .file directives with
202 /// explicit directories.
203 bool hasMCUseDwarfDirectory() const { return MCUseDwarfDirectory; }
205 /// setMCUseDwarfDirectory - Set whether all we should use .file directives
206 /// with explicit directories.
207 void setMCUseDwarfDirectory(bool Value) { MCUseDwarfDirectory = Value; }
209 /// getRelocationModel - Returns the code generation relocation model. The
210 /// choices are static, PIC, and dynamic-no-pic, and target default.
211 Reloc::Model getRelocationModel() const;
213 /// getCodeModel - Returns the code model. The choices are small, kernel,
214 /// medium, large, and target default.
215 CodeModel::Model getCodeModel() const;
217 /// getTLSModel - Returns the TLS model which should be used for the given
219 TLSModel::Model getTLSModel(const GlobalValue *GV) const;
221 /// getOptLevel - Returns the optimization level: None, Less,
222 /// Default, or Aggressive.
223 CodeGenOpt::Level getOptLevel() const;
225 /// \brief Overrides the optimization level.
226 void setOptLevel(CodeGenOpt::Level Level) const;
228 void setFastISel(bool Enable) { Options.EnableFastISel = Enable; }
230 bool shouldPrintMachineCode() const { return Options.PrintMachineCode; }
232 /// getAsmVerbosityDefault - Returns the default value of asm verbosity.
234 static bool getAsmVerbosityDefault();
236 /// setAsmVerbosityDefault - Set the default value of asm verbosity. Default
238 static void setAsmVerbosityDefault(bool);
240 /// getDataSections - Return true if data objects should be emitted into their
241 /// own section, corresponds to -fdata-sections.
242 static bool getDataSections();
244 /// getFunctionSections - Return true if functions should be emitted into
245 /// their own section, corresponding to -ffunction-sections.
246 static bool getFunctionSections();
248 /// setDataSections - Set if the data are emit into separate sections.
249 static void setDataSections(bool);
251 /// setFunctionSections - Set if the functions are emit into separate
253 static void setFunctionSections(bool);
255 /// \brief Register analysis passes for this target with a pass manager.
256 virtual void addAnalysisPasses(PassManagerBase &) {}
258 /// CodeGenFileType - These enums are meant to be passed into
259 /// addPassesToEmitFile to indicate what type of file to emit, and returned by
260 /// it to indicate what type of file could actually be made.
261 enum CodeGenFileType {
264 CGFT_Null // Do not emit any output.
267 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
268 /// specified file emitted. Typically this will involve several steps of code
269 /// generation. This method should return true if emission of this file type
270 /// is not supported, or false on success.
271 virtual bool addPassesToEmitFile(PassManagerBase &,
272 formatted_raw_ostream &,
274 bool /*DisableVerify*/ = true,
275 AnalysisID /*StartAfter*/ = 0,
276 AnalysisID /*StopAfter*/ = 0) {
280 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
281 /// get machine code emitted. This uses a JITCodeEmitter object to handle
282 /// actually outputting the machine code and resolving things like the address
283 /// of functions. This method returns true if machine code emission is
286 virtual bool addPassesToEmitMachineCode(PassManagerBase &,
288 bool /*DisableVerify*/ = true) {
292 /// addPassesToEmitMC - Add passes to the specified pass manager to get
293 /// machine code emitted with the MCJIT. This method returns true if machine
294 /// code is not supported. It fills the MCContext Ctx pointer which can be
295 /// used to build custom MCStreamer.
297 virtual bool addPassesToEmitMC(PassManagerBase &,
300 bool /*DisableVerify*/ = true) {
305 /// LLVMTargetMachine - This class describes a target machine that is
306 /// implemented with the LLVM target-independent code generator.
308 class LLVMTargetMachine : public TargetMachine {
309 protected: // Can only create subclasses.
310 LLVMTargetMachine(const Target &T, StringRef TargetTriple,
311 StringRef CPU, StringRef FS, TargetOptions Options,
312 Reloc::Model RM, CodeModel::Model CM,
313 CodeGenOpt::Level OL);
317 /// \brief Register analysis passes for this target with a pass manager.
319 /// This registers target independent analysis passes.
320 virtual void addAnalysisPasses(PassManagerBase &PM);
322 /// createPassConfig - Create a pass configuration object to be used by
323 /// addPassToEmitX methods for generating a pipeline of CodeGen passes.
324 virtual TargetPassConfig *createPassConfig(PassManagerBase &PM);
326 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
327 /// specified file emitted. Typically this will involve several steps of code
329 virtual bool addPassesToEmitFile(PassManagerBase &PM,
330 formatted_raw_ostream &Out,
331 CodeGenFileType FileType,
332 bool DisableVerify = true,
333 AnalysisID StartAfter = 0,
334 AnalysisID StopAfter = 0);
336 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
337 /// get machine code emitted. This uses a JITCodeEmitter object to handle
338 /// actually outputting the machine code and resolving things like the address
339 /// of functions. This method returns true if machine code emission is
342 virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
344 bool DisableVerify = true);
346 /// addPassesToEmitMC - Add passes to the specified pass manager to get
347 /// machine code emitted with the MCJIT. This method returns true if machine
348 /// code is not supported. It fills the MCContext Ctx pointer which can be
349 /// used to build custom MCStreamer.
351 virtual bool addPassesToEmitMC(PassManagerBase &PM,
354 bool DisableVerify = true);
356 /// addCodeEmitter - This pass should be overridden by the target to add a
357 /// code emitter, if supported. If this is not supported, 'true' should be
359 virtual bool addCodeEmitter(PassManagerBase &,
365 } // End llvm namespace