AsmPrinter.h revision 41349c10cbb166c58a20896e4761455f001c611e
1//===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 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 12// all asm writers. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_CODEGEN_ASMPRINTER_H 17#define LLVM_CODEGEN_ASMPRINTER_H 18 19#include "llvm/CodeGen/MachineFunctionPass.h" 20#include "llvm/Support/DataTypes.h" 21 22namespace llvm { 23 class Constant; 24 class ConstantArray; 25 class GlobalVariable; 26 class MachineConstantPoolEntry; 27 class MachineConstantPoolValue; 28 class Mangler; 29 class TargetAsmInfo; 30 31 32 /// AsmPrinter - This class is intended to be used as a driving class for all 33 /// asm writers. 34 class AsmPrinter : public MachineFunctionPass { 35 /// FunctionNumber - This provides a unique ID for each function emitted in 36 /// this translation unit. It is autoincremented by SetupMachineFunction, 37 /// and can be accessed with getFunctionNumber() and 38 /// IncrementFunctionNumber(). 39 /// 40 unsigned FunctionNumber; 41 42 public: 43 /// Output stream on which we're printing assembly code. 44 /// 45 std::ostream &O; 46 47 /// Target machine description. 48 /// 49 TargetMachine &TM; 50 51 /// Target Asm Printer information. 52 /// 53 const TargetAsmInfo *TAI; 54 55 /// Name-mangler for global names. 56 /// 57 Mangler *Mang; 58 59 /// Cache of mangled name for current function. This is recalculated at the 60 /// beginning of each call to runOnMachineFunction(). 61 /// 62 std::string CurrentFnName; 63 64 /// CurrentSection - The current section we are emitting to. This is 65 /// controlled and used by the SwitchSection method. 66 std::string CurrentSection; 67 68 protected: 69 AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T); 70 71 public: 72 /// SwitchToTextSection - Switch to the specified section of the executable 73 /// if we are not already in it! If GV is non-null and if the global has an 74 /// explicitly requested section, we switch to the section indicated for the 75 /// global instead of NewSection. 76 /// 77 /// If the new section is an empty string, this method forgets what the 78 /// current section is, but does not emit a .section directive. 79 /// 80 /// This method is used when about to emit executable code. 81 /// 82 void SwitchToTextSection(const char *NewSection, const GlobalValue *GV = NULL); 83 84 /// SwitchToDataSection - Switch to the specified section of the executable 85 /// if we are not already in it! If GV is non-null and if the global has an 86 /// explicitly requested section, we switch to the section indicated for the 87 /// global instead of NewSection. 88 /// 89 /// If the new section is an empty string, this method forgets what the 90 /// current section is, but does not emit a .section directive. 91 /// 92 /// This method is used when about to emit data. For most assemblers, this 93 /// is the same as the SwitchToTextSection method, but not all assemblers 94 /// are the same. 95 /// 96 void SwitchToDataSection(const char *NewSection, const GlobalValue *GV = NULL); 97 98 /// getGlobalLinkName - Returns the asm/link name of of the specified 99 /// global variable. Should be overridden by each target asm printer to 100 /// generate the appropriate value. 101 virtual const std::string getGlobalLinkName(const GlobalVariable *GV) const; 102 103 protected: 104 /// doInitialization - Set up the AsmPrinter when we are working on a new 105 /// module. If your pass overrides this, it must make sure to explicitly 106 /// call this implementation. 107 bool doInitialization(Module &M); 108 109 /// doFinalization - Shut down the asmprinter. If you override this in your 110 /// pass, you must make sure to call it explicitly. 111 bool doFinalization(Module &M); 112 113 /// PrintSpecial - Print information related to the specified machine instr 114 /// that is independent of the operand, and may be independent of the instr 115 /// itself. This can be useful for portably encoding the comment character 116 /// or other bits of target-specific knowledge into the asmstrings. The 117 /// syntax used is ${:comment}. Targets can override this to add support 118 /// for their own strange codes. 119 virtual void PrintSpecial(const MachineInstr *MI, const char *Code); 120 121 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 122 /// instruction, using the specified assembler variant. Targets should 123 /// override this to format as appropriate. This method can return true if 124 /// the operand is erroneous. 125 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 126 unsigned AsmVariant, const char *ExtraCode); 127 128 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM 129 /// instruction, using the specified assembler variant as an address. 130 /// Targets should override this to format as appropriate. This method can 131 /// return true if the operand is erroneous. 132 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 133 unsigned AsmVariant, 134 const char *ExtraCode); 135 136 /// getSectionForFunction - Return the section that we should emit the 137 /// specified function body into. This defaults to 'TextSection'. This 138 /// should most likely be overridden by the target to put linkonce/weak 139 /// functions into special sections. 140 virtual std::string getSectionForFunction(const Function &F) const; 141 142 /// SetupMachineFunction - This should be called when a new MachineFunction 143 /// is being processed from runOnMachineFunction. 144 void SetupMachineFunction(MachineFunction &MF); 145 146 /// getFunctionNumber - Return a unique ID for the current function. 147 /// 148 unsigned getFunctionNumber() const { return FunctionNumber; } 149 150 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should 151 /// not normally call this, as the counter is automatically bumped by 152 /// SetupMachineFunction. 153 void IncrementFunctionNumber() { FunctionNumber++; } 154 155 /// EmitConstantPool - Print to the current output stream assembly 156 /// representations of the constants in the constant pool MCP. This is 157 /// used to print out constants which have been "spilled to memory" by 158 /// the code generator. 159 /// 160 void EmitConstantPool(MachineConstantPool *MCP); 161 162 /// EmitJumpTableInfo - Print assembly representations of the jump tables 163 /// used by the current function to the current output stream. 164 /// 165 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI, MachineFunction &MF); 166 167 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a 168 /// special global used by LLVM. If so, emit it and return true, otherwise 169 /// do nothing and return false. 170 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV); 171 172 /// EmitAlignment - Emit an alignment directive to the specified power of 173 /// two boundary. For example, if you pass in 3 here, you will get an 8 174 /// byte alignment. If a global value is specified, and if that global has 175 /// an explicit alignment requested, it will override the alignment request. 176 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const; 177 178 /// EmitZeros - Emit a block of zeros. 179 /// 180 void EmitZeros(uint64_t NumZeros) const; 181 182 /// EmitString - Emit a zero-byte-terminated string constant. 183 /// 184 virtual void EmitString(const ConstantArray *CVA) const; 185 186 /// EmitConstantValueOnly - Print out the specified constant, without a 187 /// storage class. Only constants of first-class type are allowed here. 188 void EmitConstantValueOnly(const Constant *CV); 189 190 /// EmitGlobalConstant - Print a general LLVM constant to the .s file. 191 /// 192 void EmitGlobalConstant(const Constant* CV); 193 194 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV); 195 196 /// printInlineAsm - This method formats and prints the specified machine 197 /// instruction that is an inline asm. 198 void printInlineAsm(const MachineInstr *MI) const; 199 200 /// printBasicBlockLabel - This method prints the label for the specified 201 /// MachineBasicBlock 202 virtual void printBasicBlockLabel(const MachineBasicBlock *MBB, 203 bool printColon = false, 204 bool printComment = true) const; 205 206 /// printSetLabel - This method prints a set label for the specified 207 /// MachineBasicBlock 208 void printSetLabel(unsigned uid, const MachineBasicBlock *MBB) const; 209 void printSetLabel(unsigned uid, unsigned uid2, 210 const MachineBasicBlock *MBB) const; 211 212 /// printDataDirective - This method prints the asm directive for the 213 /// specified type. 214 void printDataDirective(const Type *type); 215 216 private: 217 void EmitLLVMUsedList(Constant *List); 218 void EmitXXStructorList(Constant *List); 219 void EmitConstantPool(unsigned Alignment, const char *Section, 220 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP); 221 222 }; 223} 224 225#endif 226