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"
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;
55 class formatted_raw_ostream;
57 /// AsmPrinter - This class is intended to be used as a driving class for all
59 class AsmPrinter : public MachineFunctionPass {
62 /// FunctionNumber - This provides a unique ID for each function emitted in
63 /// this translation unit. It is autoincremented by SetupMachineFunction,
64 /// and can be accessed with getFunctionNumber() and
65 /// IncrementFunctionNumber().
67 unsigned FunctionNumber;
69 // GCMetadataPrinters - The garbage collection metadata printer table.
70 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
71 typedef gcp_map_type::iterator gcp_iterator;
72 gcp_map_type GCMetadataPrinters;
74 /// If VerboseAsm is set, a pointer to the loop info for this
80 /// MMI - If available, this is a pointer to the current MachineModuleInfo.
81 MachineModuleInfo *MMI;
83 /// DW - If available, this is a pointer to the current dwarf writer.
87 /// Output stream on which we're printing assembly code.
89 formatted_raw_ostream &O;
91 /// Target machine description.
95 /// getObjFileLowering - Return information about object file lowering.
96 TargetLoweringObjectFile &getObjFileLowering() const;
98 /// Target Asm Printer information.
100 const MCAsmInfo *MAI;
102 /// Target Register Information.
104 const TargetRegisterInfo *TRI;
106 /// OutContext - This is the context for the output file that we are
107 /// streaming. This owns all of the global MC-related objects for the
108 /// generated translation unit.
109 MCContext &OutContext;
111 /// OutStreamer - This is the MCStreamer object for the file we are
112 /// generating. This contains the transient state for the current
113 /// translation unit that we are generating (such as the current section
115 MCStreamer &OutStreamer;
117 /// The current machine function.
118 const MachineFunction *MF;
120 /// Name-mangler for global names.
124 /// Cache of mangled name for current function. This is recalculated at the
125 /// beginning of each call to runOnMachineFunction().
127 std::string CurrentFnName;
129 /// getCurrentSection() - Return the current section we are emitting to.
130 const MCSection *getCurrentSection() const;
133 /// VerboseAsm - Emit comments in assembly output if this is true.
137 /// ExuberantAsm - Emit many more comments in assembly output if
142 /// Private state for PrintSpecial()
143 // Assign a unique ID to this machine instruction.
144 mutable const MachineInstr *LastMI;
145 mutable const Function *LastFn;
146 mutable unsigned Counter;
148 // Private state for processDebugLock()
149 mutable DebugLocTuple PrevDLT;
152 explicit AsmPrinter(formatted_raw_ostream &o, TargetMachine &TM,
153 const MCAsmInfo *T, bool V);
156 virtual ~AsmPrinter();
158 /// isVerbose - Return true if assembly output should contain comments.
160 bool isVerbose() const { return VerboseAsm; }
162 /// EmitExternalGlobal - Emit the external reference to a global variable.
163 /// Should be overridden if an indirect reference should be used.
164 virtual void EmitExternalGlobal(const GlobalVariable *GV);
166 /// getCurrentFunctionEHName - Called to return the CurrentFnEHName.
168 std::string getCurrentFunctionEHName(const MachineFunction *MF) const;
170 /// getFunctionNumber - Return a unique ID for the current function.
172 unsigned getFunctionNumber() const { return FunctionNumber; }
175 /// getAnalysisUsage - Record analysis usage.
177 void getAnalysisUsage(AnalysisUsage &AU) const;
179 /// doInitialization - Set up the AsmPrinter when we are working on a new
180 /// module. If your pass overrides this, it must make sure to explicitly
181 /// call this implementation.
182 bool doInitialization(Module &M);
184 /// doFinalization - Shut down the asmprinter. If you override this in your
185 /// pass, you must make sure to call it explicitly.
186 bool doFinalization(Module &M);
188 /// PrintSpecial - Print information related to the specified machine instr
189 /// that is independent of the operand, and may be independent of the instr
190 /// itself. This can be useful for portably encoding the comment character
191 /// or other bits of target-specific knowledge into the asmstrings. The
192 /// syntax used is ${:comment}. Targets can override this to add support
193 /// for their own strange codes.
194 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
196 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
197 /// instruction, using the specified assembler variant. Targets should
198 /// override this to format as appropriate. This method can return true if
199 /// the operand is erroneous.
200 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
201 unsigned AsmVariant, const char *ExtraCode);
203 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
204 /// instruction, using the specified assembler variant as an address.
205 /// Targets should override this to format as appropriate. This method can
206 /// return true if the operand is erroneous.
207 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
209 const char *ExtraCode);
211 /// PrintGlobalVariable - Emit the specified global variable and its
212 /// initializer to the output stream.
213 virtual void PrintGlobalVariable(const GlobalVariable *GV) = 0;
215 /// SetupMachineFunction - This should be called when a new MachineFunction
216 /// is being processed from runOnMachineFunction.
217 void SetupMachineFunction(MachineFunction &MF);
219 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
220 /// not normally call this, as the counter is automatically bumped by
221 /// SetupMachineFunction.
222 void IncrementFunctionNumber() { FunctionNumber++; }
224 /// EmitConstantPool - Print to the current output stream assembly
225 /// representations of the constants in the constant pool MCP. This is
226 /// used to print out constants which have been "spilled to memory" by
227 /// the code generator.
229 void EmitConstantPool(MachineConstantPool *MCP);
231 /// EmitJumpTableInfo - Print assembly representations of the jump tables
232 /// used by the current function to the current output stream.
234 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
236 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
237 /// special global used by LLVM. If so, emit it and return true, otherwise
238 /// do nothing and return false.
239 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
242 //===------------------------------------------------------------------===//
243 /// LEB 128 number encoding.
245 /// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
246 /// representing an unsigned leb128 value.
247 void PrintULEB128(unsigned Value) const;
249 /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
250 /// representing a signed leb128 value.
251 void PrintSLEB128(int Value) const;
253 //===------------------------------------------------------------------===//
254 // Emission and print routines
257 /// PrintHex - Print a value as a hexidecimal value.
259 void PrintHex(int Value) const;
261 /// EOL - Print a newline character to asm stream. If a comment is present
262 /// then it will be printed first. Comments should not contain '\n'.
264 void EOL(const std::string &Comment) const;
265 void EOL(const char* Comment) const;
266 void EOL(const char *Comment, unsigned Encoding) const;
268 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
269 /// unsigned leb128 value.
270 void EmitULEB128Bytes(unsigned Value) const;
272 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
273 /// signed leb128 value.
274 void EmitSLEB128Bytes(int Value) const;
276 /// EmitInt8 - Emit a byte directive and value.
278 void EmitInt8(int Value) const;
280 /// EmitInt16 - Emit a short directive and value.
282 void EmitInt16(int Value) const;
284 /// EmitInt32 - Emit a long directive and value.
286 void EmitInt32(int Value) const;
288 /// EmitInt64 - Emit a long long directive and value.
290 void EmitInt64(uint64_t Value) const;
292 /// EmitString - Emit a string with quotes and a null terminator.
293 /// Special characters are emitted properly.
294 /// @verbatim (Eg. '\t') @endverbatim
295 void EmitString(const std::string &String) const;
296 void EmitString(const char *String, unsigned Size) const;
298 /// EmitFile - Emit a .file directive.
299 void EmitFile(unsigned Number, const std::string &Name) const;
301 //===------------------------------------------------------------------===//
303 /// EmitAlignment - Emit an alignment directive to the specified power of
304 /// two boundary. For example, if you pass in 3 here, you will get an 8
305 /// byte alignment. If a global value is specified, and if that global has
306 /// an explicit alignment requested, it will unconditionally override the
307 /// alignment request. However, if ForcedAlignBits is specified, this value
308 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
309 /// and the alignment computed with NumBits and the global. If UseFillExpr
310 /// is true, it also emits an optional second value FillValue which the
311 /// assembler uses to fill gaps to match alignment for text sections if the
312 /// has specified a non-zero fill value.
314 /// The algorithm is:
316 /// if (GV && GV->hasalignment) Align = GV->getalignment();
317 /// Align = std::max(Align, ForcedAlignBits);
319 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
320 unsigned ForcedAlignBits = 0,
321 bool UseFillExpr = true) const;
323 /// printLabel - This method prints a local label used by debug and
324 /// exception handling tables.
325 void printLabel(const MachineInstr *MI) const;
326 void printLabel(unsigned Id) const;
328 /// printDeclare - This method prints a local variable declaration used by
330 void printDeclare(const MachineInstr *MI) const;
332 /// EmitComments - Pretty-print comments for instructions
333 void EmitComments(const MachineInstr &MI) const;
334 /// EmitComments - Pretty-print comments for basic blocks
335 void EmitComments(const MachineBasicBlock &MBB) const;
337 /// printMCInst - Print an MCInst for this target.
339 /// Note, this is only a temporary hack to allow the MCStreamer to print
340 /// instructions, do not use this function outside of llvm-mc.
341 virtual void printMCInst(const MCInst *MI);
343 /// GetMBBSymbol - Return the MCSymbol corresponding to the specified basic
345 MCSymbol *GetMBBSymbol(unsigned MBBID) const;
347 /// EmitBasicBlockStart - This method prints the label for the specified
348 /// MachineBasicBlock, an alignment (if present) and a comment describing
349 /// it if appropriate.
350 void EmitBasicBlockStart(const MachineBasicBlock *MBB) const;
352 /// EmitZeros - Emit a block of zeros.
354 void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const;
356 /// EmitString - Emit a zero-byte-terminated string constant.
358 virtual void EmitString(const ConstantArray *CVA) const;
360 /// EmitConstantValueOnly - Print out the specified constant, without a
361 /// storage class. Only constants of first-class type are allowed here.
362 void EmitConstantValueOnly(const Constant *CV);
364 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
365 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
367 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
369 /// processDebugLoc - Processes the debug information of each machine
370 /// instruction's DebugLoc.
371 void processDebugLoc(DebugLoc DL);
373 /// printInlineAsm - This method formats and prints the specified machine
374 /// instruction that is an inline asm.
375 void printInlineAsm(const MachineInstr *MI) const;
377 /// printImplicitDef - This method prints the specified machine instruction
378 /// that is an implicit def.
379 virtual void printImplicitDef(const MachineInstr *MI) const;
382 /// printPICJumpTableSetLabel - This method prints a set label for the
383 /// specified MachineBasicBlock for a jumptable entry.
384 virtual void printPICJumpTableSetLabel(unsigned uid,
385 const MachineBasicBlock *MBB) const;
386 virtual void printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
387 const MachineBasicBlock *MBB) const;
388 virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
389 const MachineBasicBlock *MBB,
392 /// printDataDirective - This method prints the asm directive for the
394 void printDataDirective(const Type *type, unsigned AddrSpace = 0);
396 /// printVisibility - This prints visibility information about symbol, if
397 /// this is suported by the target.
398 void printVisibility(const std::string& Name, unsigned Visibility) const;
400 /// printOffset - This is just convenient handler for printing offsets.
401 void printOffset(int64_t Offset) const;
404 void EmitLLVMUsedList(Constant *List);
405 void EmitXXStructorList(Constant *List);
406 void EmitGlobalConstantStruct(const ConstantStruct* CVS,
408 void EmitGlobalConstantArray(const ConstantArray* CVA, unsigned AddrSpace);
409 void EmitGlobalConstantVector(const ConstantVector* CP);
410 void EmitGlobalConstantFP(const ConstantFP* CFP, unsigned AddrSpace);
411 void EmitGlobalConstantLargeInt(const ConstantInt* CI, unsigned AddrSpace);
412 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);