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/Analysis/DebugInfo.h"
22 #include "llvm/Support/DataTypes.h"
23 #include "llvm/Target/TargetMachine.h"
33 class GCMetadataPrinter;
35 class MachineConstantPoolEntry;
36 class MachineConstantPoolValue;
44 /// AsmPrinter - This class is intended to be used as a driving class for all
46 class AsmPrinter : public MachineFunctionPass {
49 /// FunctionNumber - This provides a unique ID for each function emitted in
50 /// this translation unit. It is autoincremented by SetupMachineFunction,
51 /// and can be accessed with getFunctionNumber() and
52 /// IncrementFunctionNumber().
54 unsigned FunctionNumber;
56 // GCMetadataPrinters - The garbage collection metadata printer table.
57 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
58 typedef gcp_map_type::iterator gcp_iterator;
59 gcp_map_type GCMetadataPrinters;
62 /// DW -This is needed because printDeclare() has to insert
63 /// DbgVariable entries into the dwarf table. This is a short term hack
64 /// that ought be fixed soon.
67 // Necessary for external weak linkage support
68 std::set<const GlobalValue*> ExtWeakSymbols;
70 /// OptLevel - Generating code at a specific optimization level.
71 CodeGenOpt::Level OptLevel;
73 /// Output stream on which we're printing assembly code.
77 /// Target machine description.
81 /// Target Asm Printer information.
83 const TargetAsmInfo *TAI;
85 /// Target Register Information.
87 const TargetRegisterInfo *TRI;
89 /// The current machine function.
90 const MachineFunction *MF;
92 /// Name-mangler for global names.
96 /// Cache of mangled name for current function. This is recalculated at the
97 /// beginning of each call to runOnMachineFunction().
99 std::string CurrentFnName;
101 /// CurrentSection - The current section we are emitting to. This is
102 /// controlled and used by the SwitchSection method.
103 std::string CurrentSection;
104 const Section* CurrentSection_;
106 /// IsInTextSection - True if the current section we are emitting to is a
108 bool IsInTextSection;
110 /// VerboseAsm - Emit comments in assembly output if this is true.
115 explicit AsmPrinter(raw_ostream &o, TargetMachine &TM,
116 const TargetAsmInfo *T, CodeGenOpt::Level OL, bool V);
119 virtual ~AsmPrinter();
121 /// isVerbose - Return true if assembly output should contain comments.
123 bool isVerbose() const { return VerboseAsm; }
125 /// SwitchToTextSection - Switch to the specified section of the executable
126 /// if we are not already in it! If GV is non-null and if the global has an
127 /// explicitly requested section, we switch to the section indicated for the
128 /// global instead of NewSection.
130 /// If the new section is an empty string, this method forgets what the
131 /// current section is, but does not emit a .section directive.
133 /// This method is used when about to emit executable code.
135 void SwitchToTextSection(const char *NewSection, const GlobalValue *GV = NULL);
137 /// SwitchToDataSection - Switch to the specified section of the executable
138 /// if we are not already in it! If GV is non-null and if the global has an
139 /// explicitly requested section, we switch to the section indicated for the
140 /// global instead of NewSection.
142 /// If the new section is an empty string, this method forgets what the
143 /// current section is, but does not emit a .section directive.
145 /// This method is used when about to emit data. For most assemblers, this
146 /// is the same as the SwitchToTextSection method, but not all assemblers
149 void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL);
151 /// SwitchToSection - Switch to the specified section of the executable if
152 /// we are not already in it!
153 void SwitchToSection(const Section* NS);
155 /// getGlobalLinkName - Returns the asm/link name of of the specified
156 /// global variable. Should be overridden by each target asm printer to
157 /// generate the appropriate value.
158 virtual const std::string &getGlobalLinkName(const GlobalVariable *GV,
159 std::string &LinkName) const;
161 /// EmitExternalGlobal - Emit the external reference to a global variable.
162 /// Should be overridden if an indirect reference should be used.
163 virtual void EmitExternalGlobal(const GlobalVariable *GV);
165 /// getCurrentFunctionEHName - Called to return (and cache) the
168 const std::string &getCurrentFunctionEHName(const MachineFunction *MF,
169 std::string &FuncEHName) const;
172 /// getAnalysisUsage - Record analysis usage.
174 void getAnalysisUsage(AnalysisUsage &AU) const;
176 /// doInitialization - Set up the AsmPrinter when we are working on a new
177 /// module. If your pass overrides this, it must make sure to explicitly
178 /// call this implementation.
179 bool doInitialization(Module &M);
181 /// doFinalization - Shut down the asmprinter. If you override this in your
182 /// pass, you must make sure to call it explicitly.
183 bool doFinalization(Module &M);
185 /// PrintSpecial - Print information related to the specified machine instr
186 /// that is independent of the operand, and may be independent of the instr
187 /// itself. This can be useful for portably encoding the comment character
188 /// or other bits of target-specific knowledge into the asmstrings. The
189 /// syntax used is ${:comment}. Targets can override this to add support
190 /// for their own strange codes.
191 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
193 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
194 /// instruction, using the specified assembler variant. Targets should
195 /// override this to format as appropriate. This method can return true if
196 /// the operand is erroneous.
197 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
198 unsigned AsmVariant, const char *ExtraCode);
200 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
201 /// instruction, using the specified assembler variant as an address.
202 /// Targets should override this to format as appropriate. This method can
203 /// return true if the operand is erroneous.
204 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
206 const char *ExtraCode);
208 /// SetupMachineFunction - This should be called when a new MachineFunction
209 /// is being processed from runOnMachineFunction.
210 void SetupMachineFunction(MachineFunction &MF);
212 /// getFunctionNumber - Return a unique ID for the current function.
214 unsigned getFunctionNumber() const { return FunctionNumber; }
216 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
217 /// not normally call this, as the counter is automatically bumped by
218 /// SetupMachineFunction.
219 void IncrementFunctionNumber() { FunctionNumber++; }
221 /// EmitConstantPool - Print to the current output stream assembly
222 /// representations of the constants in the constant pool MCP. This is
223 /// used to print out constants which have been "spilled to memory" by
224 /// the code generator.
226 void EmitConstantPool(MachineConstantPool *MCP);
228 /// EmitJumpTableInfo - Print assembly representations of the jump tables
229 /// used by the current function to the current output stream.
231 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
233 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
234 /// special global used by LLVM. If so, emit it and return true, otherwise
235 /// do nothing and return false.
236 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
239 //===------------------------------------------------------------------===//
240 /// LEB 128 number encoding.
242 /// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
243 /// representing an unsigned leb128 value.
244 void PrintULEB128(unsigned Value) const;
246 /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
247 /// representing a signed leb128 value.
248 void PrintSLEB128(int Value) const;
250 //===------------------------------------------------------------------===//
251 // Emission and print routines
254 /// PrintHex - Print a value as a hexidecimal value.
256 void PrintHex(int Value) const;
258 /// EOL - Print a newline character to asm stream. If a comment is present
259 /// then it will be printed first. Comments should not contain '\n'.
261 void EOL(const std::string &Comment) const;
262 void EOL(const char* Comment) const;
264 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
265 /// unsigned leb128 value.
266 void EmitULEB128Bytes(unsigned Value) const;
268 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
269 /// signed leb128 value.
270 void EmitSLEB128Bytes(int Value) const;
272 /// EmitInt8 - Emit a byte directive and value.
274 void EmitInt8(int Value) const;
276 /// EmitInt16 - Emit a short directive and value.
278 void EmitInt16(int Value) const;
280 /// EmitInt32 - Emit a long directive and value.
282 void EmitInt32(int Value) const;
284 /// EmitInt64 - Emit a long long directive and value.
286 void EmitInt64(uint64_t Value) const;
288 /// EmitString - Emit a string with quotes and a null terminator.
289 /// Special characters are emitted properly.
290 /// @verbatim (Eg. '\t') @endverbatim
291 void EmitString(const std::string &String) const;
292 void EmitString(const char *String, unsigned Size) const;
294 /// EmitFile - Emit a .file directive.
295 void EmitFile(unsigned Number, const std::string &Name) const;
297 //===------------------------------------------------------------------===//
299 /// EmitAlignment - Emit an alignment directive to the specified power of
300 /// two boundary. For example, if you pass in 3 here, you will get an 8
301 /// byte alignment. If a global value is specified, and if that global has
302 /// an explicit alignment requested, it will unconditionally override the
303 /// alignment request. However, if ForcedAlignBits is specified, this value
304 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
305 /// and the alignment computed with NumBits and the global. If UseFillExpr
306 /// is true, it also emits an optional second value FillValue which the
307 /// assembler uses to fill gaps to match alignment for text sections if the
308 /// has specified a non-zero fill value.
310 /// The algorithm is:
312 /// if (GV && GV->hasalignment) Align = GV->getalignment();
313 /// Align = std::max(Align, ForcedAlignBits);
315 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
316 unsigned ForcedAlignBits = 0,
317 bool UseFillExpr = true) const;
319 /// printLabel - This method prints a local label used by debug and
320 /// exception handling tables.
321 void printLabel(const MachineInstr *MI) const;
322 void printLabel(unsigned Id) const;
324 /// printDeclare - This method prints a local variable declaration used by
326 void printDeclare(const MachineInstr *MI) const;
329 /// EmitZeros - Emit a block of zeros.
331 void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const;
333 /// EmitString - Emit a zero-byte-terminated string constant.
335 virtual void EmitString(const ConstantArray *CVA) const;
337 /// EmitConstantValueOnly - Print out the specified constant, without a
338 /// storage class. Only constants of first-class type are allowed here.
339 void EmitConstantValueOnly(const Constant *CV);
341 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
342 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
344 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
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);