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/Target/TargetInstrItineraries.h"
26 class TargetSubtarget;
27 class TargetInstrInfo;
28 class TargetIntrinsicInfo;
31 class TargetFrameInfo;
32 class MachineCodeEmitter;
34 class ObjectCodeEmitter;
35 class TargetRegisterInfo;
36 class PassManagerBase;
39 class TargetMachOWriterInfo;
40 class TargetELFWriterInfo;
41 class formatted_raw_ostream;
43 // Relocation model types.
48 PIC_, // Cannot be named PIC due to collision with -DPIC
74 // Code generation optimization level.
75 namespace CodeGenOpt {
84 //===----------------------------------------------------------------------===//
86 /// TargetMachine - Primary interface to the complete machine description for
87 /// the target machine. All target-specific information should be accessible
88 /// through this interface.
91 TargetMachine(const TargetMachine &); // DO NOT IMPLEMENT
92 void operator=(const TargetMachine &); // DO NOT IMPLEMENT
93 protected: // Can only create subclasses.
94 TargetMachine(const Target &);
96 /// getSubtargetImpl - virtual method implemented by subclasses that returns
97 /// a reference to that target's TargetSubtarget-derived member variable.
98 virtual const TargetSubtarget *getSubtargetImpl() const { return 0; }
100 /// TheTarget - The Target that this machine was created for.
101 const Target &TheTarget;
103 /// AsmInfo - Contains target specific asm information.
105 mutable const TargetAsmInfo *AsmInfo;
107 /// createTargetAsmInfo - Create a new instance of target specific asm
109 virtual const TargetAsmInfo *createTargetAsmInfo() const { return 0; }
112 virtual ~TargetMachine();
114 const Target &getTarget() const { return TheTarget; }
116 // Interfaces to the major aspects of target machine information:
117 // -- Instruction opcode and operand information
118 // -- Pipelines and scheduling information
119 // -- Stack frame information
120 // -- Selection DAG lowering information
122 virtual const TargetInstrInfo *getInstrInfo() const { return 0; }
123 virtual const TargetFrameInfo *getFrameInfo() const { return 0; }
124 virtual TargetLowering *getTargetLowering() const { return 0; }
125 virtual const TargetData *getTargetData() const { return 0; }
127 /// getTargetAsmInfo - Return target specific asm information.
129 const TargetAsmInfo *getTargetAsmInfo() const {
130 if (!AsmInfo) AsmInfo = createTargetAsmInfo();
134 /// getSubtarget - This method returns a pointer to the specified type of
135 /// TargetSubtarget. In debug builds, it verifies that the object being
136 /// returned is of the correct type.
137 template<typename STC> const STC &getSubtarget() const {
138 const TargetSubtarget *TST = getSubtargetImpl();
139 assert(TST && dynamic_cast<const STC*>(TST) &&
140 "Not the right kind of subtarget!");
141 return *static_cast<const STC*>(TST);
144 /// getRegisterInfo - If register information is available, return it. If
145 /// not, return null. This is kept separate from RegInfo until RegInfo has
146 /// details of graph coloring register allocation removed from it.
148 virtual const TargetRegisterInfo *getRegisterInfo() const { return 0; }
150 /// getIntrinsicInfo - If intrinsic information is available, return it. If
151 /// not, return null.
153 virtual const TargetIntrinsicInfo *getIntrinsicInfo() const { return 0; }
155 /// getJITInfo - If this target supports a JIT, return information for it,
156 /// otherwise return null.
158 virtual TargetJITInfo *getJITInfo() { return 0; }
160 /// getInstrItineraryData - Returns instruction itinerary data for the target
161 /// or specific subtarget.
163 virtual const InstrItineraryData getInstrItineraryData() const {
164 return InstrItineraryData();
167 /// getMachOWriterInfo - If this target supports a Mach-O writer, return
168 /// information for it, otherwise return null.
170 virtual const TargetMachOWriterInfo *getMachOWriterInfo() const { return 0; }
172 /// getELFWriterInfo - If this target supports an ELF writer, return
173 /// information for it, otherwise return null.
175 virtual const TargetELFWriterInfo *getELFWriterInfo() const { return 0; }
177 /// getRelocationModel - Returns the code generation relocation model. The
178 /// choices are static, PIC, and dynamic-no-pic, and target default.
179 static Reloc::Model getRelocationModel();
181 /// setRelocationModel - Sets the code generation relocation model.
183 static void setRelocationModel(Reloc::Model Model);
185 /// getCodeModel - Returns the code model. The choices are small, kernel,
186 /// medium, large, and target default.
187 static CodeModel::Model getCodeModel();
189 /// setCodeModel - Sets the code model.
191 static void setCodeModel(CodeModel::Model Model);
193 /// getAsmVerbosityDefault - Returns the default value of asm verbosity.
195 static bool getAsmVerbosityDefault();
197 /// setAsmVerbosityDefault - Set the default value of asm verbosity. Default
199 static void setAsmVerbosityDefault(bool);
201 /// CodeGenFileType - These enums are meant to be passed into
202 /// addPassesToEmitFile to indicate what type of file to emit.
203 enum CodeGenFileType {
204 AssemblyFile, ObjectFile, DynamicLibrary
207 /// getEnableTailMergeDefault - the default setting for -enable-tail-merge
208 /// on this target. User flag overrides.
209 virtual bool getEnableTailMergeDefault() const { return true; }
211 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
212 /// specified file emitted. Typically this will involve several steps of code
214 /// This method should return FileModel::Error if emission of this file type
215 /// is not supported.
217 virtual FileModel::Model addPassesToEmitFile(PassManagerBase &,
218 formatted_raw_ostream &,
221 return FileModel::None;
224 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
225 /// to be split up (e.g., to add an object writer pass), this method can be
226 /// used to finish up adding passes to emit the file, if necessary.
228 virtual bool addPassesToEmitFileFinish(PassManagerBase &,
229 MachineCodeEmitter *,
234 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
235 /// to be split up (e.g., to add an object writer pass), this method can be
236 /// used to finish up adding passes to emit the file, if necessary.
238 virtual bool addPassesToEmitFileFinish(PassManagerBase &,
244 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
245 /// to be split up (e.g., to add an object writer pass), this method can be
246 /// used to finish up adding passes to emit the file, if necessary.
248 virtual bool addPassesToEmitFileFinish(PassManagerBase &,
254 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
255 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
256 /// actually outputting the machine code and resolving things like the address
257 /// of functions. This method returns true if machine code emission is
260 virtual bool addPassesToEmitMachineCode(PassManagerBase &,
261 MachineCodeEmitter &,
266 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
267 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
268 /// actually outputting the machine code and resolving things like the address
269 /// of functions. This method returns true if machine code emission is
272 virtual bool addPassesToEmitMachineCode(PassManagerBase &,
278 /// addPassesToEmitWholeFile - This method can be implemented by targets that
279 /// require having the entire module at once. This is not recommended, do not
281 virtual bool WantsWholeFile() const { return false; }
282 virtual bool addPassesToEmitWholeFile(PassManager &, formatted_raw_ostream &,
289 /// LLVMTargetMachine - This class describes a target machine that is
290 /// implemented with the LLVM target-independent code generator.
292 class LLVMTargetMachine : public TargetMachine {
293 protected: // Can only create subclasses.
294 LLVMTargetMachine(const Target &T, const std::string &TargetTriple)
295 : TargetMachine(T) { }
297 /// addCommonCodeGenPasses - Add standard LLVM codegen passes used for
298 /// both emitting to assembly files or machine code output.
300 bool addCommonCodeGenPasses(PassManagerBase &, CodeGenOpt::Level);
304 /// addPassesToEmitFile - Add passes to the specified pass manager to get the
305 /// specified file emitted. Typically this will involve several steps of code
306 /// generation. If OptLevel is None, the code generator should emit code as fast
307 /// as possible, though the generated code may be less efficient. This method
308 /// should return FileModel::Error if emission of this file type is not
311 /// The default implementation of this method adds components from the
312 /// LLVM retargetable code generator, invoking the methods below to get
313 /// target-specific passes in standard locations.
315 virtual FileModel::Model addPassesToEmitFile(PassManagerBase &PM,
316 formatted_raw_ostream &Out,
317 CodeGenFileType FileType,
320 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
321 /// to be split up (e.g., to add an object writer pass), this method can be
322 /// used to finish up adding passes to emit the file, if necessary.
324 virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
325 MachineCodeEmitter *MCE,
328 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
329 /// to be split up (e.g., to add an object writer pass), this method can be
330 /// used to finish up adding passes to emit the file, if necessary.
332 virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
336 /// addPassesToEmitFileFinish - If the passes to emit the specified file had
337 /// to be split up (e.g., to add an object writer pass), this method can be
338 /// used to finish up adding passes to emit the file, if necessary.
340 virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
341 ObjectCodeEmitter *OCE,
344 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
345 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
346 /// actually outputting the machine code and resolving things like the address
347 /// of functions. This method returns true if machine code emission is
350 virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
351 MachineCodeEmitter &MCE,
354 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
355 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
356 /// actually outputting the machine code and resolving things like the address
357 /// of functions. This method returns true if machine code emission is
360 virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
364 /// Target-Independent Code Generator Pass Configuration Options.
366 /// addInstSelector - This method should add any "last minute" LLVM->LLVM
367 /// passes, then install an instruction selector pass, which converts from
368 /// LLVM code to machine instructions.
369 virtual bool addInstSelector(PassManagerBase &, CodeGenOpt::Level) {
373 /// addPreRegAllocPasses - This method may be implemented by targets that want
374 /// to run passes immediately before register allocation. This should return
375 /// true if -print-machineinstrs should print after these passes.
376 virtual bool addPreRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
380 /// addPostRegAllocPasses - This method may be implemented by targets that
381 /// want to run passes after register allocation but before prolog-epilog
382 /// insertion. This should return true if -print-machineinstrs should print
383 /// after these passes.
384 virtual bool addPostRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
388 /// addPreEmitPass - This pass may be implemented by targets that want to run
389 /// passes immediately before machine code is emitted. This should return
390 /// true if -print-machineinstrs should print out the code after the passes.
391 virtual bool addPreEmitPass(PassManagerBase &, CodeGenOpt::Level) {
396 /// addCodeEmitter - This pass should be overridden by the target to add a
397 /// code emitter, if supported. If this is not supported, 'true' should be
399 virtual bool addCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
400 MachineCodeEmitter &) {
404 /// addCodeEmitter - This pass should be overridden by the target to add a
405 /// code emitter, if supported. If this is not supported, 'true' should be
407 virtual bool addCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
412 /// addSimpleCodeEmitter - This pass should be overridden by the target to add
413 /// a code emitter (without setting flags), if supported. If this is not
414 /// supported, 'true' should be returned.
415 virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
416 MachineCodeEmitter &) {
420 /// addSimpleCodeEmitter - This pass should be overridden by the target to add
421 /// a code emitter (without setting flags), if supported. If this is not
422 /// supported, 'true' should be returned.
423 virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
428 /// addSimpleCodeEmitter - This pass should be overridden by the target to add
429 /// a code emitter (without setting flags), if supported. If this is not
430 /// supported, 'true' should be returned.
431 virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
432 ObjectCodeEmitter &) {
436 /// getEnableTailMergeDefault - the default setting for -enable-tail-merge
437 /// on this target. User flag overrides.
438 virtual bool getEnableTailMergeDefault() const { return true; }
440 /// addAssemblyEmitter - Helper function which creates a target specific
441 /// assembly printer, if available.
443 /// \return Returns 'false' on success.
444 bool addAssemblyEmitter(PassManagerBase &, CodeGenOpt::Level,
445 bool /* VerboseAsmDefault */,
446 formatted_raw_ostream &);
449 } // End llvm namespace