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 // Necessary for external weak linkage support
67 std::set<const GlobalValue*> ExtWeakSymbols;
69 /// OptLevel - Generating code at a specific optimization level.
70 CodeGenOpt::Level OptLevel;
72 /// Output stream on which we're printing assembly code.
76 /// Target machine description.
80 /// Target Asm Printer information.
82 const TargetAsmInfo *TAI;
84 /// Target Register Information.
86 const TargetRegisterInfo *TRI;
88 /// The current machine function.
89 const MachineFunction *MF;
91 /// Name-mangler for global names.
95 /// Cache of mangled name for current function. This is recalculated at the
96 /// beginning of each call to runOnMachineFunction().
98 std::string CurrentFnName;
100 /// CurrentSection - The current section we are emitting to. This is
101 /// controlled and used by the SwitchSection method.
102 std::string CurrentSection;
103 const Section* CurrentSection_;
105 /// IsInTextSection - True if the current section we are emitting to is a
107 bool IsInTextSection;
109 /// VerboseAsm - Emit comments in assembly output if this is true.
114 explicit AsmPrinter(raw_ostream &o, TargetMachine &TM,
115 const TargetAsmInfo *T, CodeGenOpt::Level OL, bool V);
118 virtual ~AsmPrinter();
120 /// isVerbose - Return true if assembly output should contain comments.
122 bool isVerbose() const { return VerboseAsm; }
124 /// SwitchToTextSection - Switch to the specified section of the executable
125 /// if we are not already in it! If GV is non-null and if the global has an
126 /// explicitly requested section, we switch to the section indicated for the
127 /// global instead of NewSection.
129 /// If the new section is an empty string, this method forgets what the
130 /// current section is, but does not emit a .section directive.
132 /// This method is used when about to emit executable code.
134 void SwitchToTextSection(const char *NewSection, const GlobalValue *GV = NULL);
136 /// SwitchToDataSection - Switch to the specified section of the executable
137 /// if we are not already in it! If GV is non-null and if the global has an
138 /// explicitly requested section, we switch to the section indicated for the
139 /// global instead of NewSection.
141 /// If the new section is an empty string, this method forgets what the
142 /// current section is, but does not emit a .section directive.
144 /// This method is used when about to emit data. For most assemblers, this
145 /// is the same as the SwitchToTextSection method, but not all assemblers
148 void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL);
150 /// SwitchToSection - Switch to the specified section of the executable if
151 /// we are not already in it!
152 void SwitchToSection(const Section* NS);
154 /// getGlobalLinkName - Returns the asm/link name of of the specified
155 /// global variable. Should be overridden by each target asm printer to
156 /// generate the appropriate value.
157 virtual const std::string &getGlobalLinkName(const GlobalVariable *GV,
158 std::string &LinkName) const;
160 /// EmitExternalGlobal - Emit the external reference to a global variable.
161 /// Should be overridden if an indirect reference should be used.
162 virtual void EmitExternalGlobal(const GlobalVariable *GV);
164 /// getCurrentFunctionEHName - Called to return (and cache) the
167 const std::string &getCurrentFunctionEHName(const MachineFunction *MF,
168 std::string &FuncEHName) const;
171 /// getAnalysisUsage - Record analysis usage.
173 void getAnalysisUsage(AnalysisUsage &AU) const;
175 /// doInitialization - Set up the AsmPrinter when we are working on a new
176 /// module. If your pass overrides this, it must make sure to explicitly
177 /// call this implementation.
178 bool doInitialization(Module &M);
180 /// doFinalization - Shut down the asmprinter. If you override this in your
181 /// pass, you must make sure to call it explicitly.
182 bool doFinalization(Module &M);
184 /// PrintSpecial - Print information related to the specified machine instr
185 /// that is independent of the operand, and may be independent of the instr
186 /// itself. This can be useful for portably encoding the comment character
187 /// or other bits of target-specific knowledge into the asmstrings. The
188 /// syntax used is ${:comment}. Targets can override this to add support
189 /// for their own strange codes.
190 virtual void PrintSpecial(const MachineInstr *MI, const char *Code) const;
192 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
193 /// instruction, using the specified assembler variant. Targets should
194 /// override this to format as appropriate. This method can return true if
195 /// the operand is erroneous.
196 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
197 unsigned AsmVariant, const char *ExtraCode);
199 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
200 /// instruction, using the specified assembler variant as an address.
201 /// Targets should override this to format as appropriate. This method can
202 /// return true if the operand is erroneous.
203 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
205 const char *ExtraCode);
207 /// SetupMachineFunction - This should be called when a new MachineFunction
208 /// is being processed from runOnMachineFunction.
209 void SetupMachineFunction(MachineFunction &MF);
211 /// getFunctionNumber - Return a unique ID for the current function.
213 unsigned getFunctionNumber() const { return FunctionNumber; }
215 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
216 /// not normally call this, as the counter is automatically bumped by
217 /// SetupMachineFunction.
218 void IncrementFunctionNumber() { FunctionNumber++; }
220 /// EmitConstantPool - Print to the current output stream assembly
221 /// representations of the constants in the constant pool MCP. This is
222 /// used to print out constants which have been "spilled to memory" by
223 /// the code generator.
225 void EmitConstantPool(MachineConstantPool *MCP);
227 /// EmitJumpTableInfo - Print assembly representations of the jump tables
228 /// used by the current function to the current output stream.
230 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF);
232 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
233 /// special global used by LLVM. If so, emit it and return true, otherwise
234 /// do nothing and return false.
235 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
238 //===------------------------------------------------------------------===//
239 /// LEB 128 number encoding.
241 /// PrintULEB128 - Print a series of hexidecimal values(separated by commas)
242 /// representing an unsigned leb128 value.
243 void PrintULEB128(unsigned Value) const;
245 /// PrintSLEB128 - Print a series of hexidecimal values(separated by commas)
246 /// representing a signed leb128 value.
247 void PrintSLEB128(int Value) const;
249 //===------------------------------------------------------------------===//
250 // Emission and print routines
253 /// PrintHex - Print a value as a hexidecimal value.
255 void PrintHex(int Value) const;
257 /// EOL - Print a newline character to asm stream. If a comment is present
258 /// then it will be printed first. Comments should not contain '\n'.
260 void EOL(const std::string &Comment) const;
261 void EOL(const char* Comment) const;
263 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
264 /// unsigned leb128 value.
265 void EmitULEB128Bytes(unsigned Value) const;
267 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
268 /// signed leb128 value.
269 void EmitSLEB128Bytes(int Value) const;
271 /// EmitInt8 - Emit a byte directive and value.
273 void EmitInt8(int Value) const;
275 /// EmitInt16 - Emit a short directive and value.
277 void EmitInt16(int Value) const;
279 /// EmitInt32 - Emit a long directive and value.
281 void EmitInt32(int Value) const;
283 /// EmitInt64 - Emit a long long directive and value.
285 void EmitInt64(uint64_t Value) const;
287 /// EmitString - Emit a string with quotes and a null terminator.
288 /// Special characters are emitted properly.
289 /// @verbatim (Eg. '\t') @endverbatim
290 void EmitString(const std::string &String) const;
291 void EmitString(const char *String, unsigned Size) const;
293 /// EmitFile - Emit a .file directive.
294 void EmitFile(unsigned Number, const std::string &Name) const;
296 //===------------------------------------------------------------------===//
298 /// EmitAlignment - Emit an alignment directive to the specified power of
299 /// two boundary. For example, if you pass in 3 here, you will get an 8
300 /// byte alignment. If a global value is specified, and if that global has
301 /// an explicit alignment requested, it will unconditionally override the
302 /// alignment request. However, if ForcedAlignBits is specified, this value
303 /// has final say: the ultimate alignment will be the max of ForcedAlignBits
304 /// and the alignment computed with NumBits and the global. If UseFillExpr
305 /// is true, it also emits an optional second value FillValue which the
306 /// assembler uses to fill gaps to match alignment for text sections if the
307 /// has specified a non-zero fill value.
309 /// The algorithm is:
311 /// if (GV && GV->hasalignment) Align = GV->getalignment();
312 /// Align = std::max(Align, ForcedAlignBits);
314 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0,
315 unsigned ForcedAlignBits = 0,
316 bool UseFillExpr = true) const;
318 /// printLabel - This method prints a local label used by debug and
319 /// exception handling tables.
320 void printLabel(const MachineInstr *MI) const;
321 void printLabel(unsigned Id) const;
323 /// printDeclare - This method prints a local variable declaration used by
325 void printDeclare(const MachineInstr *MI) const;
328 /// EmitZeros - Emit a block of zeros.
330 void EmitZeros(uint64_t NumZeros, unsigned AddrSpace = 0) const;
332 /// EmitString - Emit a zero-byte-terminated string constant.
334 virtual void EmitString(const ConstantArray *CVA) const;
336 /// EmitConstantValueOnly - Print out the specified constant, without a
337 /// storage class. Only constants of first-class type are allowed here.
338 void EmitConstantValueOnly(const Constant *CV);
340 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
341 void EmitGlobalConstant(const Constant* CV, unsigned AddrSpace = 0);
343 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
345 /// processDebugLoc - Processes the debug information of each machine
346 /// instruction's DebugLoc.
347 void processDebugLoc(DebugLoc DL);
349 /// printInlineAsm - This method formats and prints the specified machine
350 /// instruction that is an inline asm.
351 void printInlineAsm(const MachineInstr *MI) const;
353 /// printImplicitDef - This method prints the specified machine instruction
354 /// that is an implicit def.
355 virtual void printImplicitDef(const MachineInstr *MI) const;
357 /// printBasicBlockLabel - This method prints the label for the specified
358 /// MachineBasicBlock
359 virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
360 bool printAlign = false,
361 bool printColon = false,
362 bool printComment = true) 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 printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
369 const MachineBasicBlock *MBB) const;
370 virtual void printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
371 const MachineBasicBlock *MBB,
374 /// printDataDirective - This method prints the asm directive for the
376 void printDataDirective(const Type *type, unsigned AddrSpace = 0);
378 /// printSuffixedName - This prints a name with preceding
379 /// getPrivateGlobalPrefix and the specified suffix, handling quoted names
381 void printSuffixedName(const char *Name, const char *Suffix,
382 const char *Prefix = 0);
383 void printSuffixedName(const std::string &Name, const char* Suffix);
385 /// printVisibility - This prints visibility information about symbol, if
386 /// this is suported by the target.
387 void printVisibility(const std::string& Name, unsigned Visibility) const;
389 /// printOffset - This is just convenient handler for printing offsets.
390 void printOffset(int64_t Offset) const;
393 const GlobalValue *findGlobalValue(const Constant* CV);
394 void EmitLLVMUsedList(Constant *List);
395 void EmitXXStructorList(Constant *List);
396 void EmitGlobalConstantStruct(const ConstantStruct* CVS,
398 void EmitGlobalConstantArray(const ConstantArray* CVA, unsigned AddrSpace);
399 void EmitGlobalConstantVector(const ConstantVector* CP);
400 void EmitGlobalConstantFP(const ConstantFP* CFP, unsigned AddrSpace);
401 void EmitGlobalConstantLargeInt(const ConstantInt* CI, unsigned AddrSpace);
402 GCMetadataPrinter *GetOrCreateGCPrinter(GCStrategy *C);