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/ADT/DenseMap.h"
20 #include "llvm/CodeGen/MachineFunctionPass.h"
21 #include "llvm/Support/DataTypes.h"
22 #include "llvm/Target/TargetMachine.h"
32 class GCMetadataPrinter;
34 class MachineConstantPoolEntry;
35 class MachineConstantPoolValue;
43 /// AsmPrinter - This class is intended to be used as a driving class for all
45 class AsmPrinter : public MachineFunctionPass {
48 /// FunctionNumber - This provides a unique ID for each function emitted in
49 /// this translation unit. It is autoincremented by SetupMachineFunction,
50 /// and can be accessed with getFunctionNumber() and
51 /// IncrementFunctionNumber().
53 unsigned FunctionNumber;
55 // GCMetadataPrinters - The garbage collection metadata printer table.
56 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
57 typedef gcp_map_type::iterator gcp_iterator;
58 gcp_map_type GCMetadataPrinters;
61 /// DW -This is needed because printDeclare() has to insert
62 /// DbgVariable entries into the dwarf table. This is a short term hack
63 /// that ought be fixed soon.
66 /// OptLevel - Generating code at a specific optimization level.
67 CodeGenOpt::Level OptLevel;
69 /// Output stream on which we're printing assembly code.
73 /// Target machine description.
77 /// Target Asm Printer information.
79 const TargetAsmInfo *TAI;
81 /// Target Register Information.
83 const TargetRegisterInfo *TRI;
85 /// The current machine function.
86 const MachineFunction *MF;
88 /// Name-mangler for global names.
92 /// Cache of mangled name for current function. This is recalculated at the
93 /// beginning of each call to runOnMachineFunction().
95 std::string CurrentFnName;
97 /// CurrentSection - The current section we are emitting to. This is
98 /// controlled and used by the SwitchSection method.
99 std::string CurrentSection;
100 const Section* CurrentSection_;
102 /// IsInTextSection - True if the current section we are emitting to is a
104 bool IsInTextSection;
106 /// VerboseAsm - Emit comments in assembly output if this is true.
111 explicit AsmPrinter(raw_ostream &o, TargetMachine &TM,
112 const TargetAsmInfo *T, CodeGenOpt::Level OL, bool V);
115 virtual ~AsmPrinter();
117 /// isVerbose - Return true if assembly output should contain comments.
119 bool isVerbose() const { return VerboseAsm; }
121 /// SwitchToTextSection - Switch to the specified section of the executable
122 /// if we are not already in it! If GV is non-null and if the global has an
123 /// explicitly requested section, we switch to the section indicated for the
124 /// global instead of NewSection.
126 /// If the new section is an empty string, this method forgets what the
127 /// current section is, but does not emit a .section directive.
129 /// This method is used when about to emit executable code.
131 void SwitchToTextSection(const char *NewSection, const GlobalValue *GV = NULL);
133 /// SwitchToDataSection - Switch to the specified section of the executable
134 /// if we are not already in it! If GV is non-null and if the global has an
135 /// explicitly requested section, we switch to the section indicated for the
136 /// global instead of NewSection.
138 /// If the new section is an empty string, this method forgets what the
139 /// current section is, but does not emit a .section directive.
141 /// This method is used when about to emit data. For most assemblers, this
142 /// is the same as the SwitchToTextSection method, but not all assemblers
145 void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL);
147 /// SwitchToSection - Switch to the specified section of the executable if
148 /// we are not already in it!
149 void SwitchToSection(const Section* NS);
151 /// getGlobalLinkName - Returns the asm/link name of of the specified
152 /// global variable. Should be overridden by each target asm printer to
153 /// generate the appropriate value.
154 virtual const std::string &getGlobalLinkName(const GlobalVariable *GV,
155 std::string &LinkName) const;
157 /// EmitExternalGlobal - Emit the external reference to a global variable.
158 /// Should be overridden if an indirect reference should be used.
159 virtual void EmitExternalGlobal(const GlobalVariable *GV);
161 /// getCurrentFunctionEHName - Called to return (and cache) the
164 const std::string &getCurrentFunctionEHName(const MachineFunction *MF,
165 std::string &FuncEHName) const;
168 /// getAnalysisUsage - Record analysis usage.
170 void getAnalysisUsage(AnalysisUsage &AU) const;
172 /// doInitialization - Set up the AsmPrinter when we are working on a new
173 /// module. If your pass overrides this, it must make sure to explicitly
174 /// call this implementation.
175 bool doInitialization(Module &M);
177 /// doFinalization - Shut down the asmprinter. If you override this in your
178 /// pass, you must make sure to call it explicitly.
179 bool doFinalization(Module &M);
181 /// PrintSpecial - Print information related to the specified machine instr
182 /// that is independent of the operand, and may be independent of the instr
183 /// itself. This can be useful for portably encoding the comment character
184 /// or other bits of target-specific knowledge into the asmstrings. The
185 /// syntax used is ${:comment}. Targets can override this to add support
186 /// for their own strange codes.
187 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
189 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
190 /// instruction, using the specified assembler variant. Targets should
191 /// override this to format as appropriate. This method can return true if
192 /// the operand is erroneous.
193 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
194 unsigned AsmVariant, const char *ExtraCode);
196 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
197 /// instruction, using the specified assembler variant as an address.
198 /// Targets should override this to format as appropriate. This method can
199 /// return true if the operand is erroneous.
200 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
202 const char *ExtraCode);
204 /// SetupMachineFunction - This should be called when a new MachineFunction
205 /// is being processed from runOnMachineFunction.
206 void SetupMachineFunction(MachineFunction &MF);
208 /// getFunctionNumber - Return a unique ID for the current function.
210 unsigned getFunctionNumber() const { return FunctionNumber; }
212 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
213 /// not normally call this, as the counter is automatically bumped by
214 /// SetupMachineFunction.
215 void IncrementFunctionNumber() { FunctionNumber++; }
217 /// EmitConstantPool - Print to the current output stream assembly
218 /// representations of the constants in the constant pool MCP. This is
219 /// used to print out constants which have been "spilled to memory" by
220 /// the code generator.
222 void EmitConstantPool(MachineConstantPool *MCP);
224 /// EmitJumpTableInfo - Print assembly representations of the jump tables
225 /// used by the current function to the current output stream.
227 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
229 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
230 /// special global used by LLVM. If so, emit it and return true, otherwise
231 /// do nothing and return false.
232 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
235 //===------------------------------------------------------------------===//
236 /// LEB 128 number encoding.
238 /// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
239 /// representing an unsigned leb128 value.
240 void PrintULEB128(unsigned Value) const;
242 /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
243 /// representing a signed leb128 value.
244 void PrintSLEB128(int Value) const;
246 //===------------------------------------------------------------------===//
247 // Emission and print routines
250 /// PrintHex - Print a value as a hexidecimal value.
252 void PrintHex(int Value) const;
254 /// EOL - Print a newline character to asm stream. If a comment is present
255 /// then it will be printed first. Comments should not contain '\n'.
257 void EOL(const std::string &Comment) const;
258 void EOL(const char* Comment) const;
260 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
261 /// unsigned leb128 value.
262 void EmitULEB128Bytes(unsigned Value) const;
264 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
265 /// signed leb128 value.
266 void EmitSLEB128Bytes(int Value) const;
268 /// EmitInt8 - Emit a byte directive and value.
270 void EmitInt8(int Value) const;
272 /// EmitInt16 - Emit a short directive and value.
274 void EmitInt16(int Value) const;
276 /// EmitInt32 - Emit a long directive and value.
278 void EmitInt32(int Value) const;
280 /// EmitInt64 - Emit a long long directive and value.
282 void EmitInt64(uint64_t Value) const;
284 /// EmitString - Emit a string with quotes and a null terminator.
285 /// Special characters are emitted properly.
286 /// @verbatim (Eg. '\t') @endverbatim
287 void EmitString(const std::string &String) const;
288 void EmitString(const char *String, unsigned Size) const;
290 /// EmitFile - Emit a .file directive.
291 void EmitFile(unsigned Number, const std::string &Name) const;
293 //===------------------------------------------------------------------===//
295 /// EmitAlignment - Emit an alignment directive to the specified power of
296 /// two boundary. For example, if you pass in 3 here, you will get an 8
297 /// byte alignment. If a global value is specified, and if that global has
298 /// an explicit alignment requested, it will unconditionally override the
299 /// alignment request. However, if ForcedAlignBits is specified, this value
300 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
301 /// and the alignment computed with NumBits and the global. If UseFillExpr
302 /// is true, it also emits an optional second value FillValue which the
303 /// assembler uses to fill gaps to match alignment for text sections if the
304 /// has specified a non-zero fill value.
306 /// The algorithm is:
308 /// if (GV && GV->hasalignment) Align = GV->getalignment();
309 /// Align = std::max(Align, ForcedAlignBits);
311 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
312 unsigned ForcedAlignBits = 0,
313 bool UseFillExpr = true) const;
315 /// printLabel - This method prints a local label used by debug and
316 /// exception handling tables.
317 void printLabel(const MachineInstr *MI) const;
318 void printLabel(unsigned Id) const;
320 /// printDeclare - This method prints a local variable declaration used by
322 void printDeclare(const MachineInstr *MI) const;
325 /// EmitZeros - Emit a block of zeros.
327 void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const;
329 /// EmitString - Emit a zero-byte-terminated string constant.
331 virtual void EmitString(const ConstantArray *CVA) const;
333 /// EmitConstantValueOnly - Print out the specified constant, without a
334 /// storage class. Only constants of first-class type are allowed here.
335 void EmitConstantValueOnly(const Constant *CV);
337 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
338 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
340 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
342 /// processDebugLoc - Processes the debug information of each machine
343 /// instruction's DebugLoc.
344 void processDebugLoc(DebugLoc DL);
346 /// printInlineAsm - This method formats and prints the specified machine
347 /// instruction that is an inline asm.
348 void printInlineAsm(const MachineInstr *MI) const;
350 /// printImplicitDef - This method prints the specified machine instruction
351 /// that is an implicit def.
352 virtual void printImplicitDef(const MachineInstr *MI) const;
354 /// printBasicBlockLabel - This method prints the label for the specified
355 /// MachineBasicBlock
356 virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
357 bool printAlign = false,
358 bool printColon = false,
359 bool printComment = true) const;
361 /// printPICJumpTableSetLabel - This method prints a set label for the
362 /// specified MachineBasicBlock for a jumptable entry.
363 virtual void printPICJumpTableSetLabel(unsigned uid,
364 const MachineBasicBlock *MBB) const;
365 virtual void printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
366 const MachineBasicBlock *MBB) const;
367 virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
368 const MachineBasicBlock *MBB,
371 /// printDataDirective - This method prints the asm directive for the
373 void printDataDirective(const Type *type, unsigned AddrSpace = 0);
375 /// printSuffixedName - This prints a name with preceding
376 /// getPrivateGlobalPrefix and the specified suffix, handling quoted names
378 void printSuffixedName(const char *Name, const char *Suffix,
379 const char *Prefix = 0);
380 void printSuffixedName(const std::string &Name, const char* Suffix);
382 /// printVisibility - This prints visibility information about symbol, if
383 /// this is suported by the target.
384 void printVisibility(const std::string& Name, unsigned Visibility) const;
386 /// printOffset - This is just convenient handler for printing offsets.
387 void printOffset(int64_t Offset) const;
390 const GlobalValue *findGlobalValue(const Constant* CV);
391 void EmitLLVMUsedList(Constant *List);
392 void EmitXXStructorList(Constant *List);
393 void EmitGlobalConstantStruct(const ConstantStruct* CVS,
395 void EmitGlobalConstantArray(const ConstantArray* CVA, unsigned AddrSpace);
396 void EmitGlobalConstantVector(const ConstantVector* CP);
397 void EmitGlobalConstantFP(const ConstantFP* CFP, unsigned AddrSpace);
398 void EmitGlobalConstantLargeInt(const ConstantInt* CI, unsigned AddrSpace);
399 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);