1 //===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- 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 contains a class to be used as the base class for target specific
11 // asm writers. This class primarily handles common functionality used by
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_CODEGEN_ASMPRINTER_H
17 #define LLVM_CODEGEN_ASMPRINTER_H
19 #include "llvm/CodeGen/MachineFunctionPass.h"
20 #include "llvm/Support/DebugLoc.h"
21 #include "llvm/Target/TargetMachine.h"
22 #include "llvm/ADT/DenseMap.h"
33 class GCMetadataPrinter;
36 class MachineBasicBlock;
37 class MachineFunction;
39 class MachineLoopInfo;
41 class MachineConstantPool;
42 class MachineConstantPoolEntry;
43 class MachineConstantPoolValue;
44 class MachineJumpTableInfo;
45 class MachineModuleInfo;
55 class TargetLoweringObjectFile;
58 class formatted_raw_ostream;
60 /// AsmPrinter - This class is intended to be used as a driving class for all
62 class AsmPrinter : public MachineFunctionPass {
65 /// FunctionNumber - This provides a unique ID for each function emitted in
66 /// this translation unit. It is autoincremented by SetupMachineFunction,
67 /// and can be accessed with getFunctionNumber() and
68 /// IncrementFunctionNumber().
70 unsigned FunctionNumber;
72 // GCMetadataPrinters - The garbage collection metadata printer table.
73 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
74 typedef gcp_map_type::iterator gcp_iterator;
75 gcp_map_type GCMetadataPrinters;
77 /// If VerboseAsm is set, a pointer to the loop info for this
83 /// MMI - If available, this is a pointer to the current MachineModuleInfo.
84 MachineModuleInfo *MMI;
87 /// DW - If available, this is a pointer to the current dwarf writer.
91 /// Flags to specify different kinds of comments to output in
92 /// assembly code. These flags carry semantic information not
93 /// otherwise easily derivable from the IR text.
99 /// Output stream on which we're printing assembly code.
101 formatted_raw_ostream &O;
103 /// Target machine description.
107 /// getObjFileLowering - Return information about object file lowering.
108 TargetLoweringObjectFile &getObjFileLowering() const;
110 /// Target Asm Printer information.
112 const MCAsmInfo *MAI;
114 /// Target Register Information.
116 const TargetRegisterInfo *TRI;
118 /// OutContext - This is the context for the output file that we are
119 /// streaming. This owns all of the global MC-related objects for the
120 /// generated translation unit.
121 MCContext &OutContext;
123 /// OutStreamer - This is the MCStreamer object for the file we are
124 /// generating. This contains the transient state for the current
125 /// translation unit that we are generating (such as the current section
127 MCStreamer &OutStreamer;
129 /// The current machine function.
130 const MachineFunction *MF;
132 /// Name-mangler for global names.
136 /// The symbol for the current function. This is recalculated at the
137 /// beginning of each call to runOnMachineFunction().
139 MCSymbol *CurrentFnSym;
141 /// getCurrentSection() - Return the current section we are emitting to.
142 const MCSection *getCurrentSection() const;
145 /// VerboseAsm - Emit comments in assembly output if this is true.
149 /// Private state for PrintSpecial()
150 // Assign a unique ID to this machine instruction.
151 mutable const MachineInstr *LastMI;
152 mutable const Function *LastFn;
153 mutable unsigned Counter;
155 // Private state for processDebugLoc()
156 mutable const MDNode *PrevDLT;
159 explicit AsmPrinter(formatted_raw_ostream &o, TargetMachine &TM,
160 const MCAsmInfo *T, bool V);
163 virtual ~AsmPrinter();
165 /// isVerbose - Return true if assembly output should contain comments.
167 bool isVerbose() const { return VerboseAsm; }
169 /// getFunctionNumber - Return a unique ID for the current function.
171 unsigned getFunctionNumber() const { return FunctionNumber; }
174 /// getAnalysisUsage - Record analysis usage.
176 void getAnalysisUsage(AnalysisUsage &AU) const;
178 /// doInitialization - Set up the AsmPrinter when we are working on a new
179 /// module. If your pass overrides this, it must make sure to explicitly
180 /// call this implementation.
181 bool doInitialization(Module &M);
183 /// EmitStartOfAsmFile - This virtual method can be overridden by targets
184 /// that want to emit something at the start of their file.
185 virtual void EmitStartOfAsmFile(Module &) {}
187 /// EmitEndOfAsmFile - This virtual method can be overridden by targets that
188 /// want to emit something at the end of their file.
189 virtual void EmitEndOfAsmFile(Module &) {}
191 /// doFinalization - Shut down the asmprinter. If you override this in your
192 /// pass, you must make sure to call it explicitly.
193 bool doFinalization(Module &M);
195 /// PrintSpecial - Print information related to the specified machine instr
196 /// that is independent of the operand, and may be independent of the instr
197 /// itself. This can be useful for portably encoding the comment character
198 /// or other bits of target-specific knowledge into the asmstrings. The
199 /// syntax used is ${:comment}. Targets can override this to add support
200 /// for their own strange codes.
201 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
203 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
204 /// instruction, using the specified assembler variant. Targets should
205 /// override this to format as appropriate. This method can return true if
206 /// the operand is erroneous.
207 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
208 unsigned AsmVariant, const char *ExtraCode);
210 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
211 /// instruction, using the specified assembler variant as an address.
212 /// Targets should override this to format as appropriate. This method can
213 /// return true if the operand is erroneous.
214 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
216 const char *ExtraCode);
218 /// SetupMachineFunction - This should be called when a new MachineFunction
219 /// is being processed from runOnMachineFunction.
220 void SetupMachineFunction(MachineFunction &MF);
222 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
223 /// not normally call this, as the counter is automatically bumped by
224 /// SetupMachineFunction.
225 void IncrementFunctionNumber() { FunctionNumber++; }
227 /// EmitConstantPool - Print to the current output stream assembly
228 /// representations of the constants in the constant pool MCP. This is
229 /// used to print out constants which have been "spilled to memory" by
230 /// the code generator.
232 void EmitConstantPool(MachineConstantPool *MCP);
234 /// EmitJumpTableInfo - Print assembly representations of the jump tables
235 /// used by the current function to the current output stream.
237 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
239 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
240 virtual void EmitGlobalVariable(const GlobalVariable *GV);
242 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
243 /// special global used by LLVM. If so, emit it and return true, otherwise
244 /// do nothing and return false.
245 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
248 //===------------------------------------------------------------------===//
249 // Emission and print routines
252 /// EmitInt8 - Emit a byte directive and value.
254 void EmitInt8(int Value) const;
256 /// EmitInt16 - Emit a short directive and value.
258 void EmitInt16(int Value) const;
260 /// EmitInt32 - Emit a long directive and value.
262 void EmitInt32(int Value) const;
264 /// EmitInt64 - Emit a long long directive and value.
266 void EmitInt64(uint64_t Value) const;
268 //===------------------------------------------------------------------===//
270 /// EmitAlignment - Emit an alignment directive to the specified power of
271 /// two boundary. For example, if you pass in 3 here, you will get an 8
272 /// byte alignment. If a global value is specified, and if that global has
273 /// an explicit alignment requested, it will unconditionally override the
274 /// alignment request. However, if ForcedAlignBits is specified, this value
275 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
276 /// and the alignment computed with NumBits and the global. If UseFillExpr
277 /// is true, it also emits an optional second value FillValue which the
278 /// assembler uses to fill gaps to match alignment for text sections if the
279 /// has specified a non-zero fill value.
281 /// The algorithm is:
283 /// if (GV && GV->hasalignment) Align = GV->getalignment();
284 /// Align = std::max(Align, ForcedAlignBits);
286 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
287 unsigned ForcedAlignBits = 0,
288 bool UseFillExpr = true) const;
290 /// printLabel - This method prints a local label used by debug and
291 /// exception handling tables.
292 void printLabel(const MachineInstr *MI) const;
293 void printLabel(unsigned Id) const;
295 /// printDeclare - This method prints a local variable declaration used by
297 void printDeclare(const MachineInstr *MI) const;
299 /// EmitComments - Pretty-print comments for instructions
300 void EmitComments(const MachineInstr &MI) const;
302 /// GetGlobalValueSymbol - Return the MCSymbol for the specified global
304 MCSymbol *GetGlobalValueSymbol(const GlobalValue *GV) const;
306 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
307 /// global value name as its base, with the specified suffix, and where the
308 /// symbol is forced to have private linkage if ForcePrivate is true.
309 MCSymbol *GetSymbolWithGlobalValueBase(const GlobalValue *GV,
311 bool ForcePrivate = true) const;
313 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
315 MCSymbol *GetExternalSymbolSymbol(StringRef Sym) const;
317 /// GetMBBSymbol - Return the MCSymbol corresponding to the specified basic
319 MCSymbol *GetMBBSymbol(unsigned MBBID) const;
321 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
322 MCSymbol *GetCPISymbol(unsigned CPID) const;
324 /// GetJTISymbol - Return the symbol for the specified jump table entry.
325 MCSymbol *GetJTISymbol(unsigned JTID, bool isLinkerPrivate = false) const;
327 /// GetBlockAddressSymbol - Return the MCSymbol used to satisfy BlockAddress
328 /// uses of the specified basic block.
329 MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA,
330 const char *Suffix = "") const;
331 MCSymbol *GetBlockAddressSymbol(const Function *F,
332 const BasicBlock *BB,
333 const char *Suffix = "") const;
335 /// EmitBasicBlockStart - This method prints the label for the specified
336 /// MachineBasicBlock, an alignment (if present) and a comment describing
337 /// it if appropriate.
338 void EmitBasicBlockStart(const MachineBasicBlock *MBB) const;
343 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
344 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
347 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
349 /// processDebugLoc - Processes the debug information of each machine
350 /// instruction's DebugLoc.
351 void processDebugLoc(const MachineInstr *MI, bool BeforePrintingInsn);
353 /// printInlineAsm - This method formats and prints the specified machine
354 /// instruction that is an inline asm.
355 void printInlineAsm(const MachineInstr *MI) const;
357 /// printImplicitDef - This method prints the specified machine instruction
358 /// that is an implicit def.
359 void printImplicitDef(const MachineInstr *MI) const;
361 /// printKill - This method prints the specified kill machine instruction.
362 void printKill(const MachineInstr *MI) const;
364 /// printPICJumpTableSetLabel - This method prints a set label for the
365 /// specified MachineBasicBlock for a jumptable entry.
366 virtual void printPICJumpTableSetLabel(unsigned uid,
367 const MachineBasicBlock *MBB) const;
368 virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
369 const MachineBasicBlock *MBB,
372 /// printVisibility - This prints visibility information about symbol, if
373 /// this is suported by the target.
374 void printVisibility(MCSymbol *Sym, unsigned Visibility) const;
376 /// printOffset - This is just convenient handler for printing offsets.
377 void printOffset(int64_t Offset) const;
380 void EmitLLVMUsedList(Constant *List);
381 void EmitXXStructorList(Constant *List);
382 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);