1 //===-- llvm/CodeGen/AsmPrinter.h - AsmPrinter Framework --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
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.
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/DataTypes.h"
26 class MachineConstantPoolEntry;
27 class MachineConstantPoolValue;
32 /// AsmPrinter - This class is intended to be used as a driving class for all
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().
40 unsigned FunctionNumber;
43 /// Output stream on which we're printing assembly code.
47 /// Target machine description.
51 /// Target Asm Printer information.
53 const TargetAsmInfo *TAI;
55 /// Name-mangler for global names.
59 /// Cache of mangled name for current function. This is recalculated at the
60 /// beginning of each call to runOnMachineFunction().
62 std::string CurrentFnName;
64 /// CurrentSection - The current section we are emitting to. This is
65 /// controlled and used by the SwitchSection method.
66 std::string CurrentSection;
69 AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
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.
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.
80 /// This method is used when about to emit executable code.
82 void SwitchToTextSection(const char *NewSection, const GlobalValue *GV);
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.
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.
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
96 void SwitchToDataSection(const char *NewSection, const GlobalValue *GV);
98 /// getPreferredAlignmentLog - Return the preferred alignment of the
99 /// specified global, returned in log form. This includes an explicitly
100 /// requested alignment (if the global has one).
101 unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const;
103 /// doInitialization - Set up the AsmPrinter when we are working on a new
104 /// module. If your pass overrides this, it must make sure to explicitly
105 /// call this implementation.
106 bool doInitialization(Module &M);
108 /// doFinalization - Shut down the asmprinter. If you override this in your
109 /// pass, you must make sure to call it explicitly.
110 bool doFinalization(Module &M);
112 /// PrintSpecial - Print information related to the specified machine instr
113 /// that is independent of the operand, and may be independent of the instr
114 /// itself. This can be useful for portably encoding the comment character
115 /// or other bits of target-specific knowledge into the asmstrings. The
116 /// syntax used is ${:comment}. Targets can override this to add support
117 /// for their own strange codes.
118 virtual void PrintSpecial(const MachineInstr *MI, const char *Code);
120 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
121 /// instruction, using the specified assembler variant. Targets should
122 /// override this to format as appropriate. This method can return true if
123 /// the operand is erroneous.
124 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
125 unsigned AsmVariant, const char *ExtraCode);
127 /// PrintAsmMemoryOperand - Print the specified operand of MI, an INLINEASM
128 /// instruction, using the specified assembler variant as an address.
129 /// Targets should override this to format as appropriate. This method can
130 /// return true if the operand is erroneous.
131 virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
133 const char *ExtraCode);
135 /// getSectionForFunction - Return the section that we should emit the
136 /// specified function body into. This defaults to 'TextSection'. This
137 /// should most likely be overridden by the target to put linkonce/weak
138 /// functions into special sections.
139 virtual std::string getSectionForFunction(const Function &F) const;
141 /// SetupMachineFunction - This should be called when a new MachineFunction
142 /// is being processed from runOnMachineFunction.
143 void SetupMachineFunction(MachineFunction &MF);
145 /// getFunctionNumber - Return a unique ID for the current function.
147 unsigned getFunctionNumber() const { return FunctionNumber; }
149 /// IncrementFunctionNumber - Increase Function Number. AsmPrinters should
150 /// not normally call this, as the counter is automatically bumped by
151 /// SetupMachineFunction.
152 void IncrementFunctionNumber() { FunctionNumber++; }
154 /// EmitConstantPool - Print to the current output stream assembly
155 /// representations of the constants in the constant pool MCP. This is
156 /// used to print out constants which have been "spilled to memory" by
157 /// the code generator.
159 void EmitConstantPool(MachineConstantPool *MCP);
161 /// EmitJumpTableInfo - Print assembly representations of the jump tables
162 /// used by the current function to the current output stream.
164 void EmitJumpTableInfo(MachineJumpTableInfo *MJTI);
166 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
167 /// special global used by LLVM. If so, emit it and return true, otherwise
168 /// do nothing and return false.
169 bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
171 /// EmitAlignment - Emit an alignment directive to the specified power of
172 /// two boundary. For example, if you pass in 3 here, you will get an 8
173 /// byte alignment. If a global value is specified, and if that global has
174 /// an explicit alignment requested, it will override the alignment request.
175 void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const;
177 /// EmitZeros - Emit a block of zeros.
179 void EmitZeros(uint64_t NumZeros) const;
181 /// EmitString - Emit a zero-byte-terminated string constant.
183 virtual void EmitString(const ConstantArray *CVA) const;
185 /// EmitConstantValueOnly - Print out the specified constant, without a
186 /// storage class. Only constants of first-class type are allowed here.
187 void EmitConstantValueOnly(const Constant *CV);
189 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
191 void EmitGlobalConstant(const Constant* CV);
193 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
195 /// printInlineAsm - This method formats and prints the specified machine
196 /// instruction that is an inline asm.
197 void printInlineAsm(const MachineInstr *MI) const;
199 /// printBasicBlockLabel - This method prints the label for the specified
200 /// MachineBasicBlock
201 virtual void printBasicBlockLabel(const MachineBasicBlock *MBB,
202 bool printColon = false,
203 bool printComment = true) const;
205 /// printSetLabel - This method prints a set label for the specified
206 /// MachineBasicBlock
207 void printSetLabel(unsigned uid, const MachineBasicBlock *MBB) const;
209 /// printDataDirective - This method prints the asm directive for the
211 void printDataDirective(const Type *type);
214 void EmitLLVMUsedList(Constant *List);
215 void EmitXXStructorList(Constant *List);
216 void EmitConstantPool(unsigned Alignment, const char *Section,
217 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP);