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"
32 class GCMetadataPrinter;
35 class MachineBasicBlock;
36 class MachineFunction;
38 class MachineLoopInfo;
40 class MachineConstantPool;
41 class MachineConstantPoolEntry;
42 class MachineConstantPoolValue;
43 class MachineJumpTableInfo;
44 class MachineModuleInfo;
53 class TargetLoweringObjectFile;
56 class formatted_raw_ostream;
58 /// AsmPrinter - This class is intended to be used as a driving class for all
60 class AsmPrinter : public MachineFunctionPass {
63 // GCMetadataPrinters - The garbage collection metadata printer table.
64 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
65 typedef gcp_map_type::iterator gcp_iterator;
66 gcp_map_type GCMetadataPrinters;
68 /// If VerboseAsm is set, a pointer to the loop info for this
74 /// MMI - If available, this is a pointer to the current MachineModuleInfo.
75 MachineModuleInfo *MMI;
78 /// DW - If available, this is a pointer to the current dwarf writer.
83 /// Output stream on which we're printing assembly code.
85 formatted_raw_ostream &O;
87 /// Target machine description.
91 /// getObjFileLowering - Return information about object file lowering.
92 TargetLoweringObjectFile &getObjFileLowering() const;
94 /// Target Asm Printer information.
98 /// Target Register Information.
100 const TargetRegisterInfo *TRI;
102 /// OutContext - This is the context for the output file that we are
103 /// streaming. This owns all of the global MC-related objects for the
104 /// generated translation unit.
105 MCContext &OutContext;
107 /// OutStreamer - This is the MCStreamer object for the file we are
108 /// generating. This contains the transient state for the current
109 /// translation unit that we are generating (such as the current section
111 MCStreamer &OutStreamer;
113 /// The current machine function.
114 const MachineFunction *MF;
116 /// Name-mangler for global names.
120 /// The symbol for the current function. This is recalculated at the
121 /// beginning of each call to runOnMachineFunction().
123 MCSymbol *CurrentFnSym;
125 /// getCurrentSection() - Return the current section we are emitting to.
126 const MCSection *getCurrentSection() const;
129 /// VerboseAsm - Emit comments in assembly output if this is true.
133 /// Private state for PrintSpecial()
134 // Assign a unique ID to this machine instruction.
135 mutable const MachineInstr *LastMI;
136 mutable const Function *LastFn;
137 mutable unsigned Counter;
138 mutable unsigned SetCounter;
141 explicit AsmPrinter(formatted_raw_ostream &o, TargetMachine &TM,
142 MCStreamer &Streamer);
145 virtual ~AsmPrinter();
147 /// isVerbose - Return true if assembly output should contain comments.
149 bool isVerbose() const { return VerboseAsm; }
151 /// getFunctionNumber - Return a unique ID for the current function.
153 unsigned getFunctionNumber() const;
156 /// getAnalysisUsage - Record analysis usage.
158 void getAnalysisUsage(AnalysisUsage &AU) const;
160 /// doInitialization - Set up the AsmPrinter when we are working on a new
161 /// module. If your pass overrides this, it must make sure to explicitly
162 /// call this implementation.
163 bool doInitialization(Module &M);
165 /// EmitStartOfAsmFile - This virtual method can be overridden by targets
166 /// that want to emit something at the start of their file.
167 virtual void EmitStartOfAsmFile(Module &) {}
169 /// EmitEndOfAsmFile - This virtual method can be overridden by targets that
170 /// want to emit something at the end of their file.
171 virtual void EmitEndOfAsmFile(Module &) {}
173 /// doFinalization - Shut down the asmprinter. If you override this in your
174 /// pass, you must make sure to call it explicitly.
175 bool doFinalization(Module &M);
177 /// PrintSpecial - Print information related to the specified machine instr
178 /// that is independent of the operand, and may be independent of the instr
179 /// itself. This can be useful for portably encoding the comment character
180 /// or other bits of target-specific knowledge into the asmstrings. The
181 /// syntax used is ${:comment}. Targets can override this to add support
182 /// for their own strange codes.
183 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
185 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
186 /// instruction, using the specified assembler variant. Targets should
187 /// override this to format as appropriate. This method can return true if
188 /// the operand is erroneous.
189 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
190 unsigned AsmVariant, const char *ExtraCode);
192 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
193 /// instruction, using the specified assembler variant as an address.
194 /// Targets should override this to format as appropriate. This method can
195 /// return true if the operand is erroneous.
196 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
198 const char *ExtraCode);
200 /// runOnMachineFunction - Emit the specified function out to the
202 virtual bool runOnMachineFunction(MachineFunction &MF) {
203 SetupMachineFunction(MF);
204 EmitFunctionHeader();
209 /// SetupMachineFunction - This should be called when a new MachineFunction
210 /// is being processed from runOnMachineFunction.
211 void SetupMachineFunction(MachineFunction &MF);
213 /// EmitFunctionHeader - This method emits the header for the current
215 void EmitFunctionHeader();
217 /// EmitFunctionBody - This method emits the body and trailer for a
219 void EmitFunctionBody();
221 /// EmitInstruction - Targets should implement this to emit instructions.
222 virtual void EmitInstruction(const MachineInstr *) {
223 assert(0 && "EmitInstruction not implemented");
226 /// EmitFunctionBodyStart - Targets can override this to emit stuff before
227 /// the first basic block in the function.
228 virtual void EmitFunctionBodyStart() {}
230 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
231 /// the last basic block in the function.
232 virtual void EmitFunctionBodyEnd() {}
234 /// EmitConstantPool - Print to the current output stream assembly
235 /// representations of the constants in the constant pool MCP. This is
236 /// used to print out constants which have been "spilled to memory" by
237 /// the code generator.
239 virtual void EmitConstantPool();
241 /// EmitJumpTableInfo - Print assembly representations of the jump tables
242 /// used by the current function to the current output stream.
244 void EmitJumpTableInfo();
246 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
247 virtual void EmitGlobalVariable(const GlobalVariable *GV);
249 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
250 /// special global used by LLVM. If so, emit it and return true, otherwise
251 /// do nothing and return false.
252 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
255 //===------------------------------------------------------------------===//
256 // Emission and print routines
259 /// EmitInt8 - Emit a byte directive and value.
261 void EmitInt8(int Value) const;
263 /// EmitInt16 - Emit a short directive and value.
265 void EmitInt16(int Value) const;
267 /// EmitInt32 - Emit a long directive and value.
269 void EmitInt32(int Value) const;
271 /// EmitInt64 - Emit a long long directive and value.
273 void EmitInt64(uint64_t Value) const;
276 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
277 /// in bytes of the directive is specified by Size and Hi/Lo specify the
278 /// labels. This implicitly uses .set if it is available.
279 void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
280 unsigned Size) const;
282 //===------------------------------------------------------------------===//
284 /// EmitAlignment - Emit an alignment directive to the specified power of
285 /// two boundary. For example, if you pass in 3 here, you will get an 8
286 /// byte alignment. If a global value is specified, and if that global has
287 /// an explicit alignment requested, it will unconditionally override the
288 /// alignment request. However, if ForcedAlignBits is specified, this value
289 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
290 /// and the alignment computed with NumBits and the global. If UseFillExpr
291 /// is true, it also emits an optional second value FillValue which the
292 /// assembler uses to fill gaps to match alignment for text sections if the
293 /// has specified a non-zero fill value.
295 /// The algorithm is:
297 /// if (GV && GV->hasalignment) Align = GV->getalignment();
298 /// Align = std::max(Align, ForcedAlignBits);
300 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
301 unsigned ForcedAlignBits = 0,
302 bool UseFillExpr = true) const;
304 /// printDeclare - This method prints a local variable declaration used by
306 void printDeclare(const MachineInstr *MI) const;
308 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
309 /// global value name as its base, with the specified suffix, and where the
310 /// symbol is forced to have private linkage if ForcePrivate is true.
311 MCSymbol *GetSymbolWithGlobalValueBase(const GlobalValue *GV,
313 bool ForcePrivate = true) const;
315 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
317 MCSymbol *GetExternalSymbolSymbol(StringRef Sym) const;
319 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
320 MCSymbol *GetCPISymbol(unsigned CPID) const;
322 /// GetJTISymbol - Return the symbol for the specified jump table entry.
323 MCSymbol *GetJTISymbol(unsigned JTID, bool isLinkerPrivate = false) const;
325 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
326 /// FIXME: privatize to AsmPrinter.
327 MCSymbol *GetJTSetSymbol(unsigned UID, unsigned MBBID) const;
329 /// GetBlockAddressSymbol - Return the MCSymbol used to satisfy BlockAddress
330 /// uses of the specified basic block.
331 MCSymbol *GetBlockAddressSymbol(const BlockAddress *BA) const;
332 MCSymbol *GetBlockAddressSymbol(const BasicBlock *BB) const;
334 /// EmitBasicBlockStart - This method prints the label for the specified
335 /// MachineBasicBlock, an alignment (if present) and a comment describing
336 /// it if appropriate.
337 void EmitBasicBlockStart(const MachineBasicBlock *MBB) const;
342 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
343 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
346 virtual void EmitFunctionEntryLabel();
348 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
350 /// printOffset - This is just convenient handler for printing offsets.
351 void printOffset(int64_t Offset) const;
353 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
354 /// exactly one predecessor and the control transfer mechanism between
355 /// the predecessor and this block is a fall-through.
356 virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
360 /// processDebugLoc - Processes the debug information of each machine
361 /// instruction's DebugLoc.
362 void processDebugLoc(const MachineInstr *MI, bool BeforePrintingInsn);
364 void printLabelInst(const MachineInstr *MI) const;
366 /// printInlineAsm - This method formats and prints the specified machine
367 /// instruction that is an inline asm.
368 void printInlineAsm(const MachineInstr *MI) const;
370 /// printImplicitDef - This method prints the specified machine instruction
371 /// that is an implicit def.
372 void printImplicitDef(const MachineInstr *MI) const;
374 /// printKill - This method prints the specified kill machine instruction.
375 void printKill(const MachineInstr *MI) const;
377 /// EmitVisibility - This emits visibility information about symbol, if
378 /// this is suported by the target.
379 void EmitVisibility(MCSymbol *Sym, unsigned Visibility) const;
381 void EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const;
383 void EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
384 const MachineBasicBlock *MBB,
386 void EmitLLVMUsedList(Constant *List);
387 void EmitXXStructorList(Constant *List);
388 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);