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 MCUseCFI : 1;
89 unsigned MCUseDwarfDirectory : 1;
90 unsigned RequireStructuredCFG : 1;
93 virtual ~TargetMachine();
95 const Target &getTarget() const { return TheTarget; }
97 const StringRef getTargetTriple() const { return TargetTriple; }
98 const StringRef getTargetCPU() const { return TargetCPU; }
99 const StringRef getTargetFeatureString() const { return TargetFS; }
101 /// getSubtargetImpl - virtual method implemented by subclasses that returns
102 /// a reference to that target's TargetSubtargetInfo-derived member variable.
103 virtual const TargetSubtargetInfo *getSubtargetImpl() const { return 0; }
105 mutable TargetOptions Options;
107 /// \brief Reset the target options based on the function's attributes.
108 void resetTargetOptions(const MachineFunction *MF) const;
110 // Interfaces to the major aspects of target machine information:
112 // -- Instruction opcode and operand information
113 // -- Pipelines and scheduling information
114 // -- Stack frame information
115 // -- Selection DAG lowering information
117 // N.B. These objects may change during compilation. It's not safe to cache
118 // them between functions.
119 virtual const TargetInstrInfo *getInstrInfo() const { return 0; }
120 virtual const TargetFrameLowering *getFrameLowering() const { return 0; }
121 virtual const TargetLowering *getTargetLowering() const { return 0; }
122 virtual const TargetSelectionDAGInfo *getSelectionDAGInfo() const{ return 0; }
123 virtual const DataLayout *getDataLayout() const { return 0; }
125 /// getMCAsmInfo - Return target specific asm information.
127 const MCAsmInfo *getMCAsmInfo() const { return AsmInfo; }
129 /// getSubtarget - This method returns a pointer to the specified type of
130 /// TargetSubtargetInfo. In debug builds, it verifies that the object being
131 /// returned is of the correct type.
132 template<typename STC> const STC &getSubtarget() const {
133 return *static_cast<const STC*>(getSubtargetImpl());
136 /// getRegisterInfo - If register information is available, return it. If
137 /// not, return null. This is kept separate from RegInfo until RegInfo has
138 /// details of graph coloring register allocation removed from it.
140 virtual const TargetRegisterInfo *getRegisterInfo() const { return 0; }
142 /// getIntrinsicInfo - If intrinsic information is available, return it. If
143 /// not, return null.
145 virtual const TargetIntrinsicInfo *getIntrinsicInfo() const { return 0; }
147 /// getJITInfo - If this target supports a JIT, return information for it,
148 /// otherwise return null.
150 virtual TargetJITInfo *getJITInfo() { return 0; }
152 /// getInstrItineraryData - Returns instruction itinerary data for the target
153 /// or specific subtarget.
155 virtual const InstrItineraryData *getInstrItineraryData() const {
159 bool requiresStructuredCFG() const { return RequireStructuredCFG; }
160 void setRequiresStructuredCFG(bool Value) { RequireStructuredCFG = Value; }
162 /// hasMCRelaxAll - Check whether all machine code instructions should be
164 bool hasMCRelaxAll() const { return MCRelaxAll; }
166 /// setMCRelaxAll - Set whether all machine code instructions should be
168 void setMCRelaxAll(bool Value) { MCRelaxAll = Value; }
170 /// hasMCSaveTempLabels - Check whether temporary labels will be preserved
171 /// (i.e., not treated as temporary).
172 bool hasMCSaveTempLabels() const { return MCSaveTempLabels; }
174 /// setMCSaveTempLabels - Set whether temporary labels will be preserved
175 /// (i.e., not treated as temporary).
176 void setMCSaveTempLabels(bool Value) { MCSaveTempLabels = Value; }
178 /// hasMCNoExecStack - Check whether an executable stack is not needed.
179 bool hasMCNoExecStack() const { return MCNoExecStack; }
181 /// setMCNoExecStack - Set whether an executabel stack is not needed.
182 void setMCNoExecStack(bool Value) { MCNoExecStack = Value; }
184 /// hasMCUseCFI - Check whether we should use dwarf's .cfi_* directives.
185 bool hasMCUseCFI() const { return MCUseCFI; }
187 /// setMCUseCFI - Set whether all we should use dwarf's .cfi_* directives.
188 void setMCUseCFI(bool Value) { MCUseCFI = Value; }
190 /// hasMCUseDwarfDirectory - Check whether we should use .file directives with
191 /// explicit directories.
192 bool hasMCUseDwarfDirectory() const { return MCUseDwarfDirectory; }
194 /// setMCUseDwarfDirectory - Set whether all we should use .file directives
195 /// with explicit directories.
196 void setMCUseDwarfDirectory(bool Value) { MCUseDwarfDirectory = Value; }
198 /// getRelocationModel - Returns the code generation relocation model. The
199 /// choices are static, PIC, and dynamic-no-pic, and target default.
200 Reloc::Model getRelocationModel() const;
202 /// getCodeModel - Returns the code model. The choices are small, kernel,
203 /// medium, large, and target default.
204 CodeModel::Model getCodeModel() const;
206 /// getTLSModel - Returns the TLS model which should be used for the given
208 TLSModel::Model getTLSModel(const GlobalValue *GV) const;
210 /// getOptLevel - Returns the optimization level: None, Less,
211 /// Default, or Aggressive.
212 CodeGenOpt::Level getOptLevel() const;
214 /// \brief Overrides the optimization level.
215 void setOptLevel(CodeGenOpt::Level Level) const;
217 void setFastISel(bool Enable) { Options.EnableFastISel = Enable; }
219 bool shouldPrintMachineCode() const { return Options.PrintMachineCode; }
221 /// getAsmVerbosityDefault - Returns the default value of asm verbosity.
223 static bool getAsmVerbosityDefault();
225 /// setAsmVerbosityDefault - Set the default value of asm verbosity. Default
227 static void setAsmVerbosityDefault(bool);
229 /// getDataSections - Return true if data objects should be emitted into their
230 /// own section, corresponds to -fdata-sections.
231 static bool getDataSections();
233 /// getFunctionSections - Return true if functions should be emitted into
234 /// their own section, corresponding to -ffunction-sections.
235 static bool getFunctionSections();
237 /// setDataSections - Set if the data are emit into separate sections.
238 static void setDataSections(bool);
240 /// setFunctionSections - Set if the functions are emit into separate
242 static void setFunctionSections(bool);
244 /// \brief Register analysis passes for this target with a pass manager.
245 virtual void addAnalysisPasses(PassManagerBase &) {}
247 /// CodeGenFileType - These enums are meant to be passed into
248 /// addPassesToEmitFile to indicate what type of file to emit, and returned by
249 /// it to indicate what type of file could actually be made.
250 enum CodeGenFileType {
253 CGFT_Null // Do not emit any output.
256 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
257 /// specified file emitted. Typically this will involve several steps of code
258 /// generation. This method should return true if emission of this file type
259 /// is not supported, or false on success.
260 virtual bool addPassesToEmitFile(PassManagerBase &,
261 formatted_raw_ostream &,
263 bool /*DisableVerify*/ = true,
264 AnalysisID /*StartAfter*/ = 0,
265 AnalysisID /*StopAfter*/ = 0) {
269 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
270 /// get machine code emitted. This uses a JITCodeEmitter object to handle
271 /// actually outputting the machine code and resolving things like the address
272 /// of functions. This method returns true if machine code emission is
275 virtual bool addPassesToEmitMachineCode(PassManagerBase &,
277 bool /*DisableVerify*/ = true) {
281 /// addPassesToEmitMC - Add passes to the specified pass manager to get
282 /// machine code emitted with the MCJIT. This method returns true if machine
283 /// code is not supported. It fills the MCContext Ctx pointer which can be
284 /// used to build custom MCStreamer.
286 virtual bool addPassesToEmitMC(PassManagerBase &,
289 bool /*DisableVerify*/ = true) {
294 /// LLVMTargetMachine - This class describes a target machine that is
295 /// implemented with the LLVM target-independent code generator.
297 class LLVMTargetMachine : public TargetMachine {
298 protected: // Can only create subclasses.
299 LLVMTargetMachine(const Target &T, StringRef TargetTriple,
300 StringRef CPU, StringRef FS, TargetOptions Options,
301 Reloc::Model RM, CodeModel::Model CM,
302 CodeGenOpt::Level OL);
306 /// \brief Register analysis passes for this target with a pass manager.
308 /// This registers target independent analysis passes.
309 virtual void addAnalysisPasses(PassManagerBase &PM);
311 /// createPassConfig - Create a pass configuration object to be used by
312 /// addPassToEmitX methods for generating a pipeline of CodeGen passes.
313 virtual TargetPassConfig *createPassConfig(PassManagerBase &PM);
315 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
316 /// specified file emitted. Typically this will involve several steps of code
318 virtual bool addPassesToEmitFile(PassManagerBase &PM,
319 formatted_raw_ostream &Out,
320 CodeGenFileType FileType,
321 bool DisableVerify = true,
322 AnalysisID StartAfter = 0,
323 AnalysisID StopAfter = 0);
325 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
326 /// get machine code emitted. This uses a JITCodeEmitter object to handle
327 /// actually outputting the machine code and resolving things like the address
328 /// of functions. This method returns true if machine code emission is
331 virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
333 bool DisableVerify = true);
335 /// addPassesToEmitMC - Add passes to the specified pass manager to get
336 /// machine code emitted with the MCJIT. This method returns true if machine
337 /// code is not supported. It fills the MCContext Ctx pointer which can be
338 /// used to build custom MCStreamer.
340 virtual bool addPassesToEmitMC(PassManagerBase &PM,
343 bool DisableVerify = true);
345 /// addCodeEmitter - This pass should be overridden by the target to add a
346 /// code emitter, if supported. If this is not supported, 'true' should be
348 virtual bool addCodeEmitter(PassManagerBase &,
354 } // End llvm namespace